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1

Categorical Exclusion Determinations: Office of Energy Efficiency and  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

0, 2010 0, 2010 CX-001718: Categorical Exclusion Determination Purchase and Installation of a Geothermal Power Plant Module, Heat Exchanger and Cooling Tower System to Generate Electricity Using Geothermal Water Resources CX(s) Applied: A9, B5.1, B5.2 Date: 04/20/2010 Location(s): Klamath Falls, Oregon Office(s): Energy Efficiency and Renewable Energy, Golden Field Office April 20, 2010 CX-001848: Categorical Exclusion Determination Michigan-Tribe-Nottawaseppi Huron Band of the Potawatomi CX(s) Applied: A9, B5.1 Date: 04/20/2010 Location(s): Michigan Office(s): Energy Efficiency and Renewable Energy April 20, 2010 CX-001748: Categorical Exclusion Determination Alaska-Tribe-Cook Inlet Region, Incorporated CX(s) Applied: A9, A11, B2.5, B5.1 Date: 04/20/2010 Location(s): Alaska

2

CX-001848: Categorical Exclusion Determination | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

48: Categorical Exclusion Determination 48: Categorical Exclusion Determination CX-001848: Categorical Exclusion Determination Michigan-Tribe-Nottawaseppi Huron Band of the Potawatomi CX(s) Applied: A9, B5.1 Date: 04/20/2010 Location(s): Michigan Office(s): Energy Efficiency and Renewable Energy Energy Efficiency and Conservation Block Grant for:1) Funds for incremental costs associated with building three Leadership in Energy and Environmental Design (LEED) certified homes on the Pine Creek Reservation and acquiring technical services for project management services for their construction (incremental costs are for purchasing materials for foundation walls, lumber [sealants and energy heel truss], additional framing required, geothermal heat pump, plumbing, insulation, landscaping, LEED supervision

3

Page not found | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

81 - 6690 of 26,764 results. 81 - 6690 of 26,764 results. Download CX-001748: Categorical Exclusion Determination Alaska-Tribe-Cook Inlet Region, Incorporated CX(s) Applied: A9, A11, B2.5, B5.1 Date: 04/20/2010 Location(s): Alaska Office(s): Energy Efficiency and Renewable Energy http://energy.gov/nepa/downloads/cx-001748-categorical-exclusion-determination Download CX-001848: Categorical Exclusion Determination Michigan-Tribe-Nottawaseppi Huron Band of the Potawatomi CX(s) Applied: A9, B5.1 Date: 04/20/2010 Location(s): Michigan Office(s): Energy Efficiency and Renewable Energy http://energy.gov/nepa/downloads/cx-001848-categorical-exclusion-determination Download CX-001761: Categorical Exclusion Determination California-City-Palmdale CX(s) Applied: A1, A9, B1.32, B2.5, B5.1 Date: 04/19/2010

4

Huron Schools | Open Energy Information  

Open Energy Info (EERE)

Schools Schools Jump to: navigation, search Name Huron Schools Facility Huron Schools Sector Wind energy Facility Type Small Scale Wind Facility Status In Service Owner Huron Schools Energy Purchaser Huron Schools Location Huron OH Coordinates 41.39615954°, -82.56472349° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.39615954,"lon":-82.56472349,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

5

Port Huron, MI Liquefied Natural Gas Exports (Million Cubic Feet...  

Annual Energy Outlook 2012 (EIA)

(Million Cubic Feet) Port Huron, MI Liquefied Natural Gas Exports (Million Cubic Feet) Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2013 1 2014 1 1 1 1 2 1 1 1 1 - No...

6

Port Huron, MI Liquefied Natural Gas Exports to Canada (Million...  

Annual Energy Outlook 2012 (EIA)

to Canada (Million Cubic Feet) Port Huron, MI Liquefied Natural Gas Exports to Canada (Million Cubic Feet) Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2013 1 2014 1 1 1 1...

7

Huron County, Michigan: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Huron County, Michigan: Energy Resources Huron County, Michigan: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 43.9466791°, -82.820974° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":43.9466791,"lon":-82.820974,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

8

MHK Projects/Lake Huron | Open Energy Information  

Open Energy Info (EERE)

Lake Huron Lake Huron < MHK Projects Jump to: navigation, search << Return to the MHK database homepage Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"350px","centre":false,"title":"","label":"","icon":"File:Aquamarine-marker.png","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":44.2076,"lon":-81.6235,"alt":0,"address":"","icon":"http:\/\/prod-http-80-800498448.us-east-1.elb.amazonaws.com\/w\/images\/7\/74\/Aquamarine-marker.png","group":"","inlineLabel":"","visitedicon":""}]}

9

MODELING PHYTOPLANKTON ABUNDANCE IN SAGINAW BAY, LAKE HURON: USING ARTIFICIAL NEURAL NETWORKS TO DISCERN FUNCTIONAL INFLUENCE  

E-Print Network (OSTI)

MODELING PHYTOPLANKTON ABUNDANCE IN SAGINAW BAY, LAKE HURON: USING ARTIFICIAL NEURAL NETWORKS; phytoplankton Abbreviations: ANN, artificial neural network; Cl? , chloride; DOC, dissolved organic carbon; Kd Phytoplankton abundance, as chl a, in Saginaw Bay, Lake Huron was modeled using arti- ficial neural networks

10

Bird Banding  

NLE Websites -- All DOE Office Websites (Extended Search)

Bird Banding Bird Banding Name: Matthew Location: N/A Country: N/A Date: N/A Question: I am researching why the US fish and wildlife agency bands ducks and what information is used to set hunting daily and possession limits. Replies: Matt, The USFW service has been doing this for decades to have statistical data on the population fluctuations of all birds. This information serves to warn when over hunting has taken a toll on a species or if a species is declining due to habitat loss or whatever. This information also indicates need for increased habitat areas as well as possible hunting restrictions. This organization has a formula for setting hunting limits based upon the data received from banding. It is important that all hunters return these bands for they are the ones who will suffer if the information is not there. Females of any species are the most important for reproduction and often they are protected over the males. This should explain the differences in what can be bagged.

11

Linking Synoptic-scale Climate Phenomena to Lake-Level Variability in the Lake Michigan-Huron Basin  

Science Journals Connector (OSTI)

Lake-level change in the mid-latitudes is causally linked to variability in precipitation and evaporation that are dynamically linked to cyclone passages and larger-scale atmospheric variability across temporal scales. Hence, lake-level variability is both a product of and a record of synoptic-scale climate variability. Here, a daily synoptic classification for 19561999 is used to evaluate historical Lake Michigan-Huron water levels in the context of changes in the frequency and intensity of synoptic-scale phenomena. The results demonstrate that both within-type evolution and shifts in the relative frequency of synoptic types contributed to precipitation and evaporation anomalies through the historical period with the former reflecting the importance of the Great Lakes in determining the regional climate. Shifts in the frequency and intensity of synoptic winter types are also demonstrated to be contributing anomalous precipitation and evaporation coincident with phases of lake level associated with the 30-year quasi-periodicity. The synoptic-scale mechanisms of lake-level change over longer time scales illuminated here can be used to infer information about past climate states and improve projections of lake level from model simulations.

Nathan J. Polderman; Sara C. Pryor

2004-01-01T23:59:59.000Z

12

British wind band music.  

E-Print Network (OSTI)

??I have chosen to be assessed as an interpreter and conductor of British wind band music from the earliest writings for wind band up to, (more)

Jones, GO

2005-01-01T23:59:59.000Z

13

Banded electromagnetic stator core  

DOE Patents (OSTI)

A stator core for an electromagnetic pump includes a plurality of circumferentially adjoining groups of flat laminations disposed about a common centerline axis and collectively defining a central bore and a discontinuous outer perimeter, with adjacent groups diverging radially outwardly to form V-shaped gaps. An annular band surrounds the groups and is predeterminedly tensioned to clamp together the laminations, and has a predetermined flexibility in a radial direction to form substantially straight bridge sections between the adjacent groups.

Fanning, Alan W. (San Jose, CA); Gonzales, Aaron A. (San Jose, CA); Patel, Mahadeo R. (San Jose, CA); Olich, Eugene E. (Aptos, CA)

1996-01-01T23:59:59.000Z

14

Banded electromagnetic stator core  

DOE Patents (OSTI)

A stator core for an electromagnetic pump includes a plurality of circumferentially adjoining groups of flat laminations disposed about a common centerline axis and collectively defining a central bore and a discontinuous outer perimeter, with adjacent groups diverging radially outwardly to form V-shaped gaps. An annular band surrounds the groups and is predeterminedly tensioned to clamp together the laminations, and has a predetermined flexibility in a radial direction to form substantially straight bridge sections between the adjacent groups.

Fanning, Alan W. (San Jose, CA); Gonzales, Aaron A. (San Jose, CA); Patel, Mahadeo R. (San Jose, CA); Olich, Eugene E. (Aptos, CA)

1994-01-01T23:59:59.000Z

15

Banded electromagnetic stator core  

DOE Patents (OSTI)

A stator core for an electromagnetic pump includes a plurality of circumferentially adjoining groups of flat laminations disposed about a common centerline axis and collectively defining a central bore and a discontinuous outer perimeter, with adjacent groups diverging radially outwardly to form V-shaped gaps. An annular band surrounds the groups and is predeterminedly tensioned to clamp together the laminations, and has a predetermined flexibility in a radial direction to form substantially straight bridge sections between the adjacent groups. 5 figs.

Fanning, A.W.; Gonzales, A.A.; Patel, M.R.; Olich, E.E.

1996-06-11T23:59:59.000Z

16

Banded electromagnetic stator core  

DOE Patents (OSTI)

A stator core for an electromagnetic pump includes a plurality of circumferentially adjoining groups of flat laminations disposed about a common centerline axis and collectively defining a central bore and a discontinuous outer perimeter, with adjacent groups diverging radially outwardly to form V-shaped gaps. An annular band surrounds the groups and is predeterminedly tensioned to clamp together the laminations, and has a predetermined flexibility in a radial direction to form substantially straight bridge sections between the adjacent groups. 5 figures.

Fanning, A.W.; Gonzales, A.A.; Patel, M.R.; Olich, E.E.

1994-04-05T23:59:59.000Z

17

Band crossing in a shears band of {sup 108}Cd  

SciTech Connect

The level lifetimes have been measured for a shears band of {sup 108}Cd that exhibits band crossing. The observed level energies and B(M1) rates have been successfully described by a semiclassical geometric model based on shear mechanism. In this geometric model, the band crossing in the shears band has been described as the reopening of the angle between the blades of a shear.

Roy, Santosh; Datta, Pradip; Pal, S.; Chattopadhyay, S.; Bhattacharya, S.; Goswami, A.; Jain, H. C.; Joshi, P. K.; Bhowmik, R. K.; Kumar, R.; Muralithar, S.; Singh, R. P.; Madhavan, N.; Rao, P. V. Madhusudhana [S. N. Bose National Centre for Basic Sciences. Block JD, Sector III, Saltlake City, Kolkata 700098 (India); iThemba Labs, Post Office Box 722, Somerset West 7129 (South Africa); Saha Institute of Nuclear Physics, 1/AF Bidhannager Kolkata, 700 064 (India); Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005 (India); Inter University Accelerator Center, Aruna Asaf Ali Marg, New Delhi 110 067 (India); Department of Physics, Andra University, Visakhapatnam 530 003 (India)

2010-05-15T23:59:59.000Z

18

Broad-band beam buncher  

DOE Patents (OSTI)

A broad-band beam buncher is disclosed, comprising an evacuated housing, an electron gun therein for producing an electron beam, a buncher cavity having entrance and exit openings through which the beam is directed, grids across such openings, a source providing a positive DC voltage between the cavity and the electron gun, a drift tube through which the electron beam travels in passing through such cavity, grids across the ends of such drift tube, gaps being provided between the drift tube grids and the entrance and exit grids, a modulator for supplying an ultrahigh frequency modulating signal to the drift tube for producing velocity modulation of the electrons in the beam, a drift space in the housing through which the velocity modulated electron beam travels and in which the beam is bunched, and a discharge opening from such drift tube and having a grid across such opening through which the bunched electron beam is discharged into an accelerator or the like. The buncher cavity and the drift tube may be arranged to constitute an extension of a coaxial transmission line which is employed to deliver the modulating signal from a signal source. The extended transmission line may be terminated in its characteristic impedance to afford a broad-band response and the device as a whole designed to effect broad-band beam coupling, so as to minimize variations of the output across the response band.

Goldberg, David A. (Walnut Creek, CA); Flood, William S. (Berkeley, CA); Arthur, Allan A. (Martinez, CA); Voelker, Ferdinand (Orinda, CA)

1986-01-01T23:59:59.000Z

19

BNL | S-band Linac  

NLE Websites -- All DOE Office Websites (Extended Search)

S-band Linac S-band Linac Some experiments at the ATF require higher energies than what is available from the photoinjector. We use two traveling wave linac structures, known as 'SLAC sections' (from the famous 2-mile SLAC linac). Each section provides an acceleration given by: Energy gain (in MeV) = 10.8*SQRT(Power in MW)-39.5*Current(in amps) The current to be used is an equivalent steady state current. The microwave drive power, at a frequency of 2856 MHz, is provided by a single XK5 klystron tube (the old SLAC klystron). This tube can provide up to 25 MW. The ATF modulator can provide the XK5 klystron with high voltage for about 3 microseconds. This 3 microsecond pulse is called the macropulse. The repetition rate for the macropulses is from 1 to 6 per second. Within each

20

Red Band Needle Blight TERMS OF REFERENCE  

E-Print Network (OSTI)

Red Band Needle Blight TERMS OF REFERENCE Purpose 1. The Programme Board has been formed to have an overview of the administration and science of Red Band Needle Blight (RBNB), to underpin decisions made

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Vibration-Rotation Bands of Trideuteromethyl Iodide  

Science Journals Connector (OSTI)

5 October 1965 research-article Vibration-Rotation Bands of Trideuteromethyl...of six parallel and nine perpendicular vibration bands of trideuteromethyl iodide has...constants for the fundamental degenerate vibrations. The values for overtone and combination...

1965-01-01T23:59:59.000Z

22

Superdeformed bands in sup 194 Tl  

SciTech Connect

Superdeformation was first observed in the mass-190 region in {sup 191}Hg. Since then, SD bands have been found in {sup 190-194}Hg nuclei. Here we report the discovery of two such bands in {sup 194}Tl which are the first SD bands fond in this mass region that are not in Hg nuclei. Subsequently, bands have been found in two Pb nuclei. 5 refs., 1 fig.

Azaiez, F.; Kelly, W.H.; Korten, W.; Deleplanque, M.A.; Stephens, F.S.; Diamond, R.M.; Beausang, C.W.; Draper, J.E.; Rubel, E. (Lawrence Berkeley Lab., CA (USA)); Becker, J.A.; Henry, E.A.; Brinkman, M.J.; Yates, S.W.; Kuhnert, A. (Lawrence Livermore National Lab., CA (USA))

1990-05-01T23:59:59.000Z

23

UT-TRIBE-NORTHWESTERN BAND OF SHOSHONE  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

U.S. Department of Energy Categorical Exclusion Determination Form Program or Field Office: Energy Efficiency and Conservation Block Grant Program Project Title UT-TRIBE-NORTHWESTERN BAND OF SHOSHONE Location: Tribe UT-TRIBE- NORTHWESTERN BAND OF SHOSHONE UT American Recovery and Reinvestment Act: Proposed Action or Project Description The Northwestern Band of Shoshone Nation of Utah proposes to perform energy efficiency improvements

24

Low band gap polymers Organic Photovoltaics  

E-Print Network (OSTI)

Low band gap polymers for Organic Photovoltaics Eva Bundgaard Ph.D. Dissertation Risø National Bundgaard Title: Low band gap polymers for Organic photovoltaics Department: The polymer department Report the area of organic photovoltaics are focusing on low band gap polymers, a type of polymer which absorbs

25

Red Band Needle Blight Programme Red Band Needle Blight of Pine Programme Group  

E-Print Network (OSTI)

Red Band Needle Blight Programme Group Red Band Needle Blight of Pine Programme Group Minutes Support Welcome and introduction 1. Jim thanked everyone for attending the first meeting of the Red Band and that the private 1 | Paper 1 - Minutes | Debbie Erskine | 23/01/2009 #12;Red Band Needle Blight Programme Group

26

Metallic-nanoparticle assisted enhanced band-to-band tunneling current Deblina Sarkara)  

E-Print Network (OSTI)

Metallic-nanoparticle assisted enhanced band-to-band tunneling current Deblina Sarkara) and Kaustav) Metallic nanoparticle assisted band-to-band tunneling is proposed, and the impact of such nanoparticle that an asymmetric pinning is required to leverage maximum benefits from the insertion of metallic nanoparticles. VC

27

Huron, California: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

2027308°, -120.1029177° 2027308°, -120.1029177° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":36.2027308,"lon":-120.1029177,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

28

For discussion only 2011 Huron Consulting Group  

E-Print Network (OSTI)

" of a server so that it is capable of operating multiple systems simultaneously, each of which functions (over 5-years) Investments: Technologies, Staff Time, Training · Increased available space · Reduced capital investment in hardware and software · Reduced maintenance and server downtime · Reduced power

29

Huron, Ohio: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

50489°, -82.5551733° 50489°, -82.5551733° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.3950489,"lon":-82.5551733,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

30

Nuclear Band Structure in Sc41  

Science Journals Connector (OSTI)

Band structure predictions assuming the formation of proton single-particle states above the Ca40 core in the ground state or one of its excited states are compared with the available data on the elastic and inelastic scattering of protons from Ca40. The band expected above the 3.35-Mev state in Ca40 is confirmed by experimental results, and some evidence is found for bands above the higher core states.

R. H. Davis

1959-09-15T23:59:59.000Z

31

X-BAND KLYSTRON DEVELOPMENT AT SLAC  

SciTech Connect

The development of X-band klystrons at SLAC originated with the idea of building an X-band Linear Collider in the late 1980's. Since then much effort has been expended in developing a reliable X-band Power source capable of delivering >50 MW RF power in pulse widths >1.5 {micro}s. I will report on some of the technical issues and design strategies which have led to the current SLAC klystron designs.

Vlieks, Arnold E.; /SLAC

2009-08-03T23:59:59.000Z

32

Broad-band beam buncher  

DOE Patents (OSTI)

A broad-band beam bunther is disclosed, comprising an evacuated housing, an electron gun therein for producing an electron beam, a buncher cavity having entrance and exit openings through which the beam is directed, grids across such openings, a source providing a positive DC voltage between the cavity and the electron gun, a drift tube through which the electron beam travels in passing through such cavity, grids across the ends of such drift tube, gaps being provided between the drift tube grids and the entrance and exit grids, a modulator for supplying an ultrahigh frequency modulating signal to the drift tube for producing velocity modulation of the electrons in the beam, a drift space in the housing through which the velocity modulated electron beam travels and in which the beam is bunched, and a discharge opening from such drift tube and having a grid across such opening through which the bunched electron beam is discharged into an accelerator or the like. The buncher cavity and the drift tube may be arranged to constitute an extension of a coaxial transmission line which is employed to deliver the modulating signal from a signal source. The extended transmission line may be terminated in its characteristic impedance to afford a broad-

Goldberg, D.A.; Flood, W.S.; Arthur, A.A.; Voelker, F.

1984-03-20T23:59:59.000Z

33

K=0 Rotational Bands in Yb174  

Science Journals Connector (OSTI)

The ? deexcitation of three excited K=0 rotational bands has been studied following population in the Yb173(n,?) reaction at resonant neutron energies of 4.53 and 17.7 eV. The ? rays were detected in singles and coincidence with Ge(Li) detectors. Analysis was also made of the primary radiation. The decay properties of these bands exhibit strong deviations from the Alaga ratios. For the lowest excited K=0 band the deexcitation branching ratios resemble those in the even-even Sm, Gd, Yb, and W nuclei. The higher-lying K=0 bands in Yb174 decay similarly to those in Yb172 but considerably differently from the lowest K=0 bands in this region. The pairing-vibrational character of the K=0 bands in Yb174, as shown by (p,t) and (t,p) reaction studies, apparently does not greatly alter the relative decay rates for these states. Two-band mixing of each K=0 band with the ground band cannot explain all the observed results, nor can three-band mixing involving the ? vibration. The presence of M1 components in the I?I transitions could explain some of the anomalous branching ratios but cannot be a complete explanation. It is suggested that multiband mixing including the excited K=0 bands themselves may have to be considered. The two-neutron-transfer-reaction data can also be interpreted in terms of such mixing. The observed similarities between Yb174 and other nuclei in this region suggest a corresponding similarity of mixing effects.

R. F. Casten; D. Breitig; W. R. Kane; S. F. Mughabghab

1973-09-01T23:59:59.000Z

34

Possible quasimolecular bands in /sup 32/S  

SciTech Connect

Below the /sup 16/O+ /sup 16/O threshold, positive- and negative-parity bands at E/sub x/ = 11--17 MeV in /sup 32/S are identified, whose moments of inertia and ..cap alpha..-reduced widths indicate possible quasimolecular bands of /sup 16/O+ /sup 16/O and of some asymmetric configuration.

Morita, K.; Kubono, S.; Tanaka, M.H.; Utsunomiya, H.; Sugitani, M.; Kato, S.; Schimizu, J.; Tachikawa, T.; Takahashi, N.

1985-07-08T23:59:59.000Z

35

A V-BAND MMIC OSCILLATOR ARRAY USING WIDE BAND MICROSTRIP PATCH ANTENNA  

E-Print Network (OSTI)

A V-BAND MMIC OSCILLATOR ARRAY USING WIDE BAND MICROSTRIP PATCH ANTENNA HONG-TUEK KIM, WOOYEOL CHOI in a push-pull mode was implemented using two 2-port patch antennas. When measured in a closed over]. In this paper, to improve this problem, we develop a modified wide band microstrip patch antenna and use

Kwon, Youngwoo

36

Narrow band gap amorphous silicon semiconductors  

DOE Patents (OSTI)

Disclosed is a narrow band gap amorphous silicon semiconductor comprising an alloy of amorphous silicon and a band gap narrowing element selected from the group consisting of Sn, Ge, and Pb, with an electron donor dopant selected from the group consisting of P, As, Sb, Bi and N. The process for producing the narrow band gap amorphous silicon semiconductor comprises the steps of forming an alloy comprising amorphous silicon and at least one of the aforesaid band gap narrowing elements in amount sufficient to narrow the band gap of the silicon semiconductor alloy below that of amorphous silicon, and also utilizing sufficient amounts of the aforesaid electron donor dopant to maintain the amorphous silicon alloy as an n-type semiconductor.

Madan, A.; Mahan, A.H.

1985-01-10T23:59:59.000Z

37

ARM - Campaign Instrument - s-band-profiler  

NLE Websites -- All DOE Office Websites (Extended Search)

govInstrumentss-band-profiler govInstrumentss-band-profiler Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign Instrument : NOAA S-band (2835 Mhz) Profiler (S-BAND-PROFILER) Instrument Categories Cloud Properties, Atmospheric Profiling Campaigns CRYSTAL-FACE [ Download Data ] Off Site Campaign : various, including non-ARM sites, 2002.06.26 - 2002.08.01 Midlatitude Continental Convective Clouds Experiment (MC3E): Multi-Frequency Profilers [ Download Data ] Southern Great Plains, 2011.04.22 - 2011.06.06 Tropical Warm Pool - International Cloud Experiment (TWP-ICE) [ Download Data ] Tropical Western Pacific, 2006.01.21 - 2006.02.13 Primary Measurements Taken The following measurements are those considered scientifically relevant. Refer to the datastream (netcdf) file headers for the list of all available

38

Rotational band properties in {sup 165}Er  

SciTech Connect

High-spin states in {sup 165}Er have been studied experimentally using the {sup 160}Gd({sup 9}Be, 4n) reaction at beam energies of 42 and 45 MeV. The previously known bands based on the 5/2{sup +}[642], 5/2{sup -}[523], and 11/2{sup -}[505] configurations are extended to (49/2{sup +}), (45/2{sup -}), and (31/2{sup -}) states, respectively. The rotational bands in {sup 165}Er generally show gradual alignment processes, indicating strong band interactions associated with the i{sub 13/2} neutron alignments. The band properties are compared with those in the neighboring nuclei and discussed within the framework of the cranked shell model.

Wang, S. T. [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Graduate University of Chinese Academy of Sciences, Beijing 100049 (China); Zhou, X. H.; Zhang, Y. H.; Zheng, Y.; Liu, M. L.; Chen, L.; Zhang, N. T.; Hua, W.; Guo, S.; Qiang, Y. H.; Li, G. S.; Ding, B. [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Shi, Y.; Xu, F. R. [School of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)

2011-07-15T23:59:59.000Z

39

Precipitation Banding in Idealized Baroclinic Waves  

Science Journals Connector (OSTI)

Moist idealized baroclinic-wave simulations show the development of precipitation bands from a zonally uniform initial midlatitude jet. For a frictionless lower boundary, and with no latent-heat release or surface heat and moisture fluxes, warm ...

Jesse Norris; Geraint Vaughan; David M. Schultz

2014-09-01T23:59:59.000Z

40

Efficient Band Gap Prediction for Solids  

E-Print Network (OSTI)

An efficient method for the prediction of fundamental band gaps in solids using density functional theory (DFT) is proposed. Generalizing the Delta self-consistent-field (?SCF [delta SCF]) method to infinite solids, the ...

Chan, Maria K.

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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Control Banding and Nanotechnology Synergist  

SciTech Connect

The average Industrial Hygienist (IH) loves a challenge, right? Okay, well here is one with more than a few twists. We start by going through the basics of a risk assessment. You have some chemical agents, a few workers, and the makings of your basic exposure characterization. However, you have no occupational exposure limit (OEL), essentially no toxicological basis, and no epidemiology. Now the real handicap is that you cannot use sampling pumps, cassettes, tubes, or any of the media in your toolbox, and the whole concept of mass-to-dose is out the window, even at high exposure levels. Of course, by the title, you knew we were talking about nanomaterials (NM). However, we wonder how many IHs know that this topic takes everything you know about your profession and turns it upside down. It takes the very foundations that you worked so hard in college and in the field to master and pulls it out from underneath you. It even takes the gold standard of our profession, the quantitative science of exposure assessment, and makes it look pretty darn rusty. Now with NM there is the potential to get some aspect of quantitative measurements, but the instruments are generally very expensive and getting an appropriate workplace personal exposure measurement can be very difficult if not impossible. The potential for workers getting exposures, however, is very real, as evidenced by a recent publication reporting worker exposures to polyacrylate nanoparticles in a Chinese factory (Song et al. 2009). With something this complex and challenging, how does a concept as simple as Control Banding (CB) save the day? Although many IHs have heard of CB, most of their knowledge comes from its application in the COSHH Essentials toolkit. While there is conflicting published research on COSHH Essentials and its value for risk assessments, almost all of the experts agree that it can be useful when no OELs are available (Zalk and Nelson 2008). It is this aspect of CB, its utility with uncertainty, that attracted international NM experts to recommend this qualitative risk assessment approach for NM. However, since their CB recommendation was only in theory, we took on the challenge of developing a working toolkit, the CB Nanotool (see Zalk et al. 2009 and Paik et al. 2008), as a means to perform a risk assessment and protect researchers at the Lawrence Livermore National Laboratory. While it's been acknowledged that engineered NM have potentially endless benefits for society, it became clear to us that the very properties that make nanotechnology so useful to industry could also make them dangerous to humans and the environment. Among the uncertainties and unknowns with NM are: the contribution of their physical structure to their toxicity, significant differences in their deposition and clearance in the lungs when compared to their parent material (PM), a lack of agreement on the appropriate indices for exposure to NM, and very little background information on exposure scenarios or populations at risk. Part of this lack of background information can be traced to the lack of risk assessments historically performed in the industry, with a recent survey indicating that 65% of companies working with NM are not doing any kind of NM-specific risk assessment as they focus on traditional PM methods for IH (Helland et al. 2009). The good news is that the amount of peer-reviewed publications that address environmental, health and safety aspects of NM has been increasing over the last few years; however, the percentage of these that address practical methods to reduce exposure and protect workers is orders of magnitude lower. Our intent in developing the CB Nanotool was to create a simplified approach that would protect workers while unraveling the mysteries of NM for experts and non-experts alike. Since such a large part of the toxicological effects of both the physical and chemical properties of NM were unknown, not to mention changing logarithmically as new NM research continues growing, we needed to account for this lack of information as part of the CB Nano

Zalk, D; Paik, S

2009-12-15T23:59:59.000Z

42

High Field W-Band (95 GHz) EPR | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

Field W-Band (95 GHz) EPR High Field W-Band (95 GHz) EPR The W-band pulsed EPR spectrometer, introduced in 2011, is one of only two of its design worldwide. It uses a Quasi-optical...

43

Systematic Study of Electronic Phases, Band Gaps and Band Overlaps of Bismuth Antimony Nanowires  

E-Print Network (OSTI)

We have developed an iterative one dimensional model to study the narrow band-gap and the associated non-parabolic dispersion relations for bismuth antimony nanowires. An analytical approximation has also been developed. Based on the general model, we have developed, we have calculated and analyzed the electronic phase diagrams and the band-gap/band-overlap map for bismuth antimony nanowires, as a function of stoichiometry, growth orientation, and wire width.

Shuang Tang; Mildred Dresselhaus

2013-12-03T23:59:59.000Z

44

Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries...  

NLE Websites -- All DOE Office Websites (Extended Search)

Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries. Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries. Abstract: Structure and electronic properties of...

45

Highly Mismatched Alloys for Intermediate Band Solar Cells  

E-Print Network (OSTI)

single-junction intermediate band solar cells. Figure 5:conversion efficiency for a solar cell fabricated from a Znfor Intermediate Band Solar Cells W. Walukiewicz 1 , K. M.

2005-01-01T23:59:59.000Z

46

Antiferromagnetism in Narrow-Band Solids  

Science Journals Connector (OSTI)

The single-band Hubbard Hamiltonian is examined in the limit of bandwidth much less than intraatomic Coulomb interaction of electrons. We make use of the canonical transformation and "spectral decomposition" of the electron creation operators proposed by Harris and Lange to write down a Green's function which describes electrons in the lower of the split bands of Hubbard's solution. The equation of motion is solved using the moment-conserving decoupling approximation of Tahir-Kheli and Jarrett. We find within our approximation that it is impossible to have an antiferromagnetic state for other than one electron per site. To remedy this defect of the single-band model, we investigate a simplified two-band model in the limit of intra-atomic Coulomb and exchange interaction much greater than the bandwidth, and find that antiferromagnetism is possible for the two nearly half-filled bands. We also discuss effects of the antiferromagnetic ordering on the conductivity in our simplified model and discuss applicability of the theory to real transition metals and transition-metal oxides.

J. B. Sokoloff

1970-02-01T23:59:59.000Z

47

Energy Band Model Based on Effective Mass  

E-Print Network (OSTI)

In this work, we demonstrate an alternative method of deriving an isotropic energy band model using a one-dimensional definition of the effective mass and experimentally observed dependence of mass on energy. We extend the effective mass definition to anti-particles and particles with zero rest mass. We assume an often observed linear dependence of mass on energy and derive a generalized non-parabolic energy-momentum relation. The resulting non-parabolicity leads to velocity saturation at high particle energies. We apply the energy band model to free relativistic particles and carriers in solid state materials and obtain commonly used dispersion relations and experimentally confirmed effective masses. We apply the model to zero rest mass particles in graphene and propose using the effective mass for photons. Therefore, it appears that the new energy band model based on the effective mass can be applied to relativistic particles and carriers in solid state materials.

Viktor Ariel

2012-09-06T23:59:59.000Z

48

Radiative Heating in Underexplored Bands Campaign (RHUBC)  

NLE Websites -- All DOE Office Websites (Extended Search)

Bands Campaign (RHUBC) D. Turner and E. Mlawer RHUBC Breakout Session 2008 ARM Science Team Meeting 13 March, 2008 Norfolk, Virginia Motivation * Radiative heating/cooling in the mid-troposphere modulate the vertical motions of the atmosphere - This heating/cooling occurs primarily in water vapor absorption bands that are opaque at the surface * Approximately 40% of the OLR comes from the far-IR * Until recently, the observational tools were not available to evaluate the accuracy of the far-IR radiative transfer models - Spectrally resolved far-IR radiances, accurate PWV * Need to validate both clear sky (WV) absorption and cirrus scattering properties in these normally opaque bands Scientific Objectives * Conduct clear sky radiative closure studies in order to reduce uncertainties

49

System-level, Unified In-band and Out-of-band Dynamic Thermal Control  

E-Print Network (OSTI)

and improve the reliability of systems. Our thermal control framework unifies temperature control mechanisms supply, etc.) to operate less efficiently. Third, high temperatures can trigger thermal emergenciesSystem-level, Unified In-band and Out-of-band Dynamic Thermal Control Dong Li* , Rong Ge** , Kirk

50

Band structure of doubly-odd nuclei around mass 130  

SciTech Connect

Nuclear structure of the doublet bands in the doubly-odd nuclei with mass A{approx}130 is studied in terms of a pair-truncated shell model. The model reproduces quite well the energy levels of the doublet bands and the electromagnetic transitions. The analysis of the electromagnetic transitions reveals new band structure of the doublet bands.

Higashiyama, Koji [Department of Physics, Chiba Institute of Technology, Narashino, Chiba 275-0023 (Japan); Yoshinaga, Naotaka [Department of Physics, Saitama University, Saitama City 338-8570 (Japan)

2011-05-06T23:59:59.000Z

51

model strongly interacting particles as rubber bands.  

E-Print Network (OSTI)

model strongly interacting particles as rubber bands. Nothing is perfect, of course. Some relativity, there is a tempta- tion to carry intelligent design to an ex- treme in which God wrote (recall Bohr's admonition, "Stop telling God what to do!"). The landscape picture derails this thinking

Hughes, Kim

52

The Wave Band' Theory of Wireless Transmission  

Science Journals Connector (OSTI)

... the tuned circuit, namely, that the really selective circuit does cut off the higher audio frequencies, generally explained by the cutting of the side bands What is actually ... its excitation has ceased. If it is excited by a carrier modulated by a high audio frequency, the persistence of its vibrations will not allow the amplitude of these to ...

A. A. NEWBOLD

1930-03-01T23:59:59.000Z

53

X-Band Photoinjector Beam Dynamics  

SciTech Connect

SLAC is studying the feasibility of using an X-band RF photocathode gun to produce low emittance bunches for applications such as a mono-energetic MeV {gamma} ray source (in collaboration with LLNL) and a photoinjector for a compact FEL. Beam dynamics studies are being done for a configuration consisting of a 5.5-cell X-band gun followed by several 53-cell high-gradient X-band accelerator structures. A fully 3D program, ImpactT, is used to track particles taking into account space charge forces, short-range longitudinal and transverse wakefields, and the 3D rf fields in the structures, including the quadrupole component of the couplers. The effect of misalignments of the various elements, including the drive-laser, gun, solenoid and accelerator structures, are evaluated. This paper presents these results and estimates of the expected bunch emittance vs cathode gradient, and the effects of mixing between the fundamental and off-frequency longitudinal modes. An X-band gun at SLAC has been shown to operate reliably with a 200 MV/m acceleration gradient at the cathode, which is nearly twice the 115 MV/m acceleration gradient in the LCLS gun. The higher gradient should roughly balance the space charge related transverse emittance growth for the same bunch charge but provide a 3-4 times shorter bunch length. The shorter length would make the subsequent bunch compression easier and allow for a more effective use of emittance exchange. Such a gun can also be used with an X-band linac to produce a compact FEL or g ray source that would require rf sources of only one frequency for beam generation and acceleration. The feasibility of using an X-band rf photocathode gun and accelerator structures to generate high quality electron beams for compact FELs and g ray sources is being studied at SLAC. Results from the X-band photoinjector beam dynamics studies are reported in this paper.

Zhou, Feng; /SLAC; Adolphsen, Chris; /SLAC; Ding, Yuantao; /SLAC; Li, Zenghai; /SLAC; Vlieks, Arnold; /SLAC

2011-12-13T23:59:59.000Z

54

Quantum-Dot Intermediate-Band Solar Cells with Inverted Band Alignment  

SciTech Connect

The intermediate-band concept was proposed over a decade ago as a possible route to increase the efficiency of single-junction solar cells. Despite a number of experimental attempts to realize this concept, no efficiency improvement over conventional single-junction solar cells has so far been demonstrated. This is likely due to the fact that the intermediate band itself acts to enhance electron-hole recombination. In this work we propose a novel intermediate-band solar-cell architecture based on doped semiconductor nanostructures having an inverted type-I band alignment with the surrounding host. The recombination of carriers in the nanostructures is prevented by ultra-fast charge transfer to the host, thereby removing the main obstacle to achieve high conversion efficiency.

Francheschetti, A.; Lany, S.; Bester, G.

2008-01-01T23:59:59.000Z

55

X-Band RF Gun Development  

SciTech Connect

In support of the MEGa-ray program at LLNL and the High Gradient research program at SLAC, a new X-band multi-cell RF gun is being developed. This gun, similar to earlier guns developed at SLAC for Compton X-ray source program, will be a standing wave structure made of 5.5 cells operating in the pi mode with copper cathode. This gun was designed following criteria used to build SLAC X-band high gradient accelerating structures. It is anticipated that this gun will operate with surface electric fields on the cathode of 200 MeV/m with low breakdown rate. RF will be coupled into the structure through a final cell with symmetric duel feeds and with a shape optimized to minimize quadrupole field components. In addition, geometry changes to the original gun, operated with Compton X-ray source, will include a wider RF mode separation, reduced surface electric and magnetic fields.

Vlieks, Arnold; Dolgashev, Valery; Tantawi, Sami; /SLAC; Anderson, Scott; Hartemann, Fred; Marsh, Roark; /LLNL, Livermore

2012-06-22T23:59:59.000Z

56

S-Band Loads for SLAC Linac  

SciTech Connect

The S-Band loads on the current SLAC linac RF system were designed, in some cases, 40+ years ago to terminate 2-3 MW peak power into a thin layer of coated Kanthal material as the high power absorber [1]. The technology of the load design was based on a flame-sprayed Kanthal wire method onto a base material. During SLAC linac upgrades, the 24 MW peak klystrons were replaced by 5045 klystrons with 65+ MW peak output power. Additionally, SLED cavities were introduced and as a result, the peak power in the current RF setup has increased up to 240 MW peak. The problem of reliable RF peak power termination and RF load lifetime required a careful study and adequate solution. Results of our studies and three designs of S-Band RF load for the present SLAC RF linac system is discussed. These designs are based on the use of low conductivity materials.

Krasnykh, A.; Decker, F.-J.; /SLAC; LeClair, R.; /INTA Technologies, Santa Clara

2012-08-28T23:59:59.000Z

57

Anomalous Doppler effects in phononic band gaps  

Science Journals Connector (OSTI)

Doppler effects in periodic acoustic media were studied theoretically and experimentally. Analytical formulas are derived using the Greens function formalism. We found that a far field observer cannot hear the sound inside a band gap from a stationary source, but a moving source can be heard even if the frequency is inside the gap, and the Doppler shifts can be inverted or anomalously large.

Xinhua Hu; Zhihong Hang; Jensen Li; Jian Zi; C. T. Chan

2006-01-30T23:59:59.000Z

58

Permanent magnet focused X-band photoinjector  

DOE Patents (OSTI)

A compact high energy photoelectron injector integrates the photocathode directly into a multicell linear accelerator with no drift space between the injection and the linac. High electron beam brightness is achieved by accelerating a tightly focused electron beam in an integrated, multi-cell, X-band rf linear accelerator (linac). The photoelectron linac employs a Plane-Wave-Transformer (PWT) design which provides strong cell-to-cell coupling, easing manufacturing tolerances and costs.

Yu, David U. L. (Rancho Palos Verdes, CA); Rosenzweig, James (Los Angeles, CA)

2002-09-10T23:59:59.000Z

59

Alternating parity bands in 87218Fr  

Science Journals Connector (OSTI)

States in doubly odd 218Fr have been studied using in-beam spectroscopy ?-?-? coincidence techniques mainly through the 209Bi(18O, 2?n) reaction at 94 MeV bombarding energy, using the 8? GASP-ISIS spectrometer at Legnaro. 218Fr shows a band structure, with interleaved states of alternating parities connected by enhanced E1 transitions. Tentative spin assignment and the relation between the structure of 218Fr and its isotone 220Ac is discussed.

M. E. Debray; M. A. Cardona; D. Hojman; A. J. Kreiner; M. Davidson; J. Davidson; H. Somacal; G. Levinton; D. R. Napoli; S. Lenzi; G. de Angelis; M. De Poli; A. Gadea; D. Bazzacco; C. Rossi-Alvarez; N. Medina

2000-07-10T23:59:59.000Z

60

Fabrication of photonic band gap materials  

DOE Patents (OSTI)

A method for forming a periodic dielectric structure exhibiting photonic band gap effects includes forming a slurry of a nano-crystalline ceramic dielectric or semiconductor material and monodisperse polymer microspheres, depositing a film of the slurry on a substrate, drying the film, and calcining the film to remove the polymer microspheres therefrom. The film may be cold-pressed after drying and prior to calcining. The ceramic dielectric or semiconductor material may be titania, and the polymer microspheres may be polystyrene microspheres.

Constant, Kristen (Ames, IA); Subramania, Ganapathi S. (Ames, IA); Biswas, Rana (Ames, IA); Ho, Kai-Ming (Ames, IA)

2002-01-15T23:59:59.000Z

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

The Negative Parity Bands in $^{156}$Gd  

E-Print Network (OSTI)

The high flux reactor of the Institut Laue-Langevin is the world most intense neutron source for research. Using the ultra high-resolution crystal spectrometers GAMS installed at the in-pile target position H6/H7 it is possible to measure nuclear state lifetimes using the Gamma Ray Induced Recoil (GRID) technique. In bent crystal mode, the spectrometers allow to perform spectroscopy with a dynamic range of up to six orders magnitude. At a very well collimated external neutron beam it is possible to install a highly efficient germanium detector array to obtain coincidences and angular correlations. The mentioned techniques were used to study the first two negative parity bands in $^{156}$Gd. These bands have been in the focus of interest since they seem to show signatures of a tetrahedral symmetry. A surprisingly high B(E2) value of about 1000 W.u. for the $4^- \\rightarrow 2^-$ transition was discovered. It indicates that the two first negative parity bands cannot be considered to be signature partners.

Michael Jentschel; Loic Sengele; Dominique Curien; Jerzy Dudek; Florent Haas

2014-04-23T23:59:59.000Z

62

Broad Band Photon Harvesting Biomolecules for Photovoltaics  

E-Print Network (OSTI)

We discuss the key principles of artificial photosynthesis for photovoltaic energy conversion. We demonstrate these principles by examining the operation of the so-called "dye sensitized solar cell" (DSSC) - a photoelectrochemical device which simulates the charge separation process across a nano-structured membrane that is characteristic of natural systems. These type of devices have great potential to challenge silicon semiconductor technology in the low cost, medium efficiency segment of the PV market. Ruthenium charge transfer complexes are currently used as the photon harvesting components in DSSCs. They produce a relatively broad band UV and visible response, but have long term stability problems and are expensive to manufacture. We suggest that a class of biological macromolecules called the melanins may be suitable replacements for the ruthenium complexes. They have strong, broad band absorption, are chemically and photochemically very stable, can be cheaply and easily synthesized, and are also bio-available and bio-compatible. We demonstrate a melanin-based regenerative solar cell, and discuss the key properties that are necessary for an effective broad band photon harvesting system.

P. Meredith; B. J. Powell; J. Riesz; R. Vogel; D. Blake; I. Kartini; G. Will; S. Subianto

2004-06-04T23:59:59.000Z

63

Potential ways of thinking about the shear-banding phenomenon  

E-Print Network (OSTI)

Shear-banding is a curious but ubiquitous phenomenon occurring in soft matter. The phenomenological similarities between the shear-banding transition and phase transitions has pushed some researchers to adopt a thermodynamical ...

Fardin, M. A.

64

Substrate-Induced Band-Gap Opening in Epitaxial Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Substrate-Induced Band-Gap Opening in Epitaxial Graphene Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Wednesday, 26 March 2008 00:00 Prospective challengers to...

65

Excitation of Banded Whistler Waves in the Magnetosphere  

SciTech Connect

Banded whistler waves can be generated by the whistler anisotropy instability driven by two bi-Maxwellian electron components with T{sub {perpendicular}}/T{sub {parallel}} > 1 at different T{sub {parallel}} For typical magnetospheric condition of 1 < {omega}{sub e}/{Omega}{sub e} < 5 in regions associated with strong chorus, upper-band waves can be excited by anisotropic electrons below {approx} 1 keV, while lower-band waves are excited by anisotropic electrons above {approx} 10 keV. Lower-band waves are generally field-aligned and substantially electromagnetic, while upper-band waves propagate obliquely and have quasi-electrostatic fluctuating electric fields. The quasi-electrostatic feature of upper-band waves suggests that they may be more easily identified in electric field observations than in magnetic field observations. Upper-band waves are liable to Landau damping and the saturation level of upperband waves is lower than lower-band waves, consistent with observations that lower-band waves are stronger than upper-band waves on average. The oblique propagation, the lower saturation level, and the more severe Landau damping together would make upper-band waves more tightly confined to the geomagnetic equator (|{lambda}{sub m}| < {approx}10{sup o}) than lower-band waves.

Gary, S. Peter [Los Alamos National Laboratory; Liu, Kaijun [Los Alamos National Laboratory; Winske, Dan [Los Alamos National Laboratory

2012-07-13T23:59:59.000Z

66

Coriolis Interaction Between Three Nilsson Bands in Pa  

Science Journals Connector (OSTI)

By comparing new experimental results with calculations, it is shown that the levels above the [5,- 3, 0] ground-state band in Pa233 and Pa231 may be interpreted as resulting from the +[6, 6, 0], the 32+[6,5,1], and the 52+[6,4,2] bands involved in a three-band Coriolis interaction.

W. Hoekstra and A. H. Wapstra

1969-04-21T23:59:59.000Z

67

An X-band overmoded relativistic klystron  

SciTech Connect

An X-band overmoded relativistic klystron is proposed, the operation mode of which is the TM{sub 02} mode. The drift tube could not cut off the TM{sub 01} mode; isolating the buncher cavity from the input cavity is achieved by introducing a sectional RF lossy material. Microwaves are extracted from the modulated electron beam using a cylindrical waveguide, rather than a coaxial waveguide; thereby, the output structure is significantly simplified. Particle-in-cell simulations show that microwaves with power of 1.28?GW and frequency of 9.30?GHz can be obtained, corresponding to an efficiency of 32% and relative bandwidth of about 8%.

Xiao, Renzhen; Chen, Changhua; Li, Jiawei; Bai, Xianchen [Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024 (China); Deng, Yuqun [Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024 (China); Department of Engineering Physics, Tsinghua University, Beijing 100084 (China)

2014-11-15T23:59:59.000Z

68

W-Band Sheet Beam Klystron Design  

SciTech Connect

Sheet beam devices provide important advantages for very high power, narrow bandwidth RF sources like accelerator klystrons [1]. Reduced current density and increased surface area result in increased power capabi1ity, reduced magnetic fields for focusing and reduced cathode loading. These advantages are offset by increased complexity, beam formation and transport issues and potential for mode competition in the ovennoded cavities and drift tube. This paper will describe the design issues encountered in developing a 100 kW peak and 2 kW average power sheet beam k1ystron at W-band including beam formation, beam transport, circuit design, circuit fabrication and mode competition.

Scheitrum, G.; Caryotakis, G.; Burke, A.; Jensen, A.; Jongewaard, E.a Krasnykh, A.; Neubauer, M.; Phillips, R.; Rauenbuehler, K.; /SLAC

2011-11-11T23:59:59.000Z

69

Band magnetism in the Hubbard model  

Science Journals Connector (OSTI)

A self-consistent moment method is applied to the Hubbard model in order to find out under what circumstances spontaneous band magnetism may occur. The theory is formulated for a two-sublattice structure to treat simultaneously para-, ferro-, and antiferromagnetic systems. The starting point is a two-pole ansatz for the one-electron spectral density, the free parameters of which are fitted by equating exactly calculated spectral moments. All correlation functions appearing in the moments can be expressed by the spectral density, guaranteeing therewith a closed system of equations, which can be solved self-consistently for the average particle numbers ?ni?? and ?ni??. A T=0 phase diagram is presented in terms of band occupation n (0?n?2) and Coulomb interaction U. Ferromagnetic solutions appear only if n exceeds a critical occupation ncFM and U a minimum value Umin. For antiferromagnetic solutions a critical U does not exist, but a critical band occupation ncAFM does.Antiferromagnetism is stable in a restricted region of n around n=1, which is broadest for intermediate couplings (U/W?1, W being the Bloch bandwidth) and shrinks to the n=1 axis for strong couplings (U/W??). For smaller n, but n>ncFM and sufficiently high U (U>W), ferromagnetism is stable, while for low band occupations the system is paramagnetic irrespective of U. The critical temperatures TC and TN are strongly U and n dependent. For fixed n, TC increases with U, but saturates for U?? at finite values (500800 K), while TN has a maximum at an intermediate U value (U?W). First-order as well as second-order transitions are observed. Ferromagnetic order arises mainly because of a shift of ? and ? quasiparticle subbands. In antiferromagnets, corresponding ? and ? subbands occupy exactly the same energy regions, but with different state densities. The magnetic behavior of the Hubbard model can be understood as a direct consequence of the sensitive (T,n,U) dependence of the quasiparticle density of states, which is therefore discussed in detail.

W. Nolting and W. Borgiel/

1989-04-01T23:59:59.000Z

70

Band Structure of {sup 85}Sr  

SciTech Connect

High spin states in {sup 85}Sr were populated using the reaction {sup 76}Ge({sup 13}C, 4n) at a beam energy of 52 MeV. Gamma-gamma coincidence measurements along with investigation of directional correlation ratios were utilized to establish the extended level scheme upto I{sup {pi}}= (35/2{sup -}). One of the positive parity states observed at 3383.3 keV ((I{sup {pi}}= 19/2{sup (+)}) may be considered as a magnetic rotational ({Delta}I = 1) band, the negative parity states built on 3028.0 level show an irregular behaviour and does not exhibit magnetic rotation.

Kumar, Suresh; Mandal, S. K. [Department of Physics and Astrophysics, University of Delhi, Delhi-110007 (India); Jain, A. K. [Department of Physics, Indian Institute of Technology, Roorkee-247667 (India); Chaturvedi, L. [Guru Ghasidas University, Bilaspur, Chhattisgarh-495009 (India); Sinha, Rishi Kumar [Department of Physics, Banaras Hindu University, Varanasi-221005 (India); Negi, Dinesh; Dhal, Ankul; Kumar, R.; Singh, R. P.; Muralithar, S.; Bhowmik, R. K.; Pancholi, S. C. [Inter University Accelerator Centre, Aruna Asaf Ali Marg, Delhi-110067 (India)

2010-11-24T23:59:59.000Z

71

Ideal Soliton Environment Using Parametric Band Gaps  

Science Journals Connector (OSTI)

Simultaneous solitary wave solutions for laser propagation in nonlinear parametric media with up to ( 3+1) dimensions are proved to exist. The combination of the large dispersion of a Bragg grating and the strong nonlinearity of ?(2) optical material results in stable behavior with short interaction distances and low power requirements. The solutions are obtained by using the effective mass approximation to reduce the coupled propagation equations to those describing a dispersive parametric nonlinear waveguide, and are verified by solving the complete set of coupled band-gap equations numerically.

H. He and P. D. Drummond

1997-06-09T23:59:59.000Z

72

The effects of enforcement on the behavior of citizen band and non-citizen band radio equipped vehicles  

E-Print Network (OSTI)

THE EFFECTS OF ENFORCEMENT ON 1HE BEHAVIOR OF CITIZEN BAND AND NON-CITIZEN BAND RADIO EQUIPPED VEHICLES A Thesis by Donald Ray Harrison Submitted to the Graduate College of Texas ASM University i n partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE May 1978 Major Subject: Industrial Engineering THE EFFECTS OF ENFORCEMENT ON THE BEHAVIOR OF CITIZEN BAND AND NON ? CITIZEN BAND RADIO EQUIPPED VEHICLES A Thesis by DONALD RAY HARRISON Approved as to style and content...

Harrison, Donald Ray

2012-06-07T23:59:59.000Z

73

Rotational bands with identical transition energies in actinide nuclei  

SciTech Connect

We point out the existence of ground-state rotational bands with identical transition energies (up to spin 8{h bar}) in {sup 240}Pu, {sup 244}Cm, {sup 246}Cm, and {sup 250}Cf. The corresponding transitions in the ground-state bands of {sup 236}U and {sup 238}U have identical energies (within {similar to}2 keV) up to spin 24{h bar}. These features are very similar to those recently observed for superdeformed bands in the mass-150 and mass-190 regions and suggest that the phenomenon of identical bands is not restricted to superdeformed bands.

Ahmad, I.; Carpenter, M.P.; Chasman, R.R.; Janssens, R.V.F.; Khoo, T.L. (Argonne National Laboratory, Argonne, Illinois (USA))

1991-09-01T23:59:59.000Z

74

Eastern Band of Cherokee Strategic Energy Plan  

SciTech Connect

The Eastern Band of Cherokee Indians was awarded a grant under the U.S. Department of Energy Tribal Energy Program (TEP) to develop a Tribal Strategic Energy Plan (SEP). The grant, awarded under the First Steps phase of the TEP, supported the development of a SEP that integrates with the Tribes plans for economic development, preservation of natural resources and the environment, and perpetuation of Tribal heritage and culture. The Tribe formed an Energy Committee consisting of members from various departments within the Tribal government. This committee, together with its consultant, the South Carolina Institute for Energy Studies, performed the following activities: Develop the Tribes energy goals and objectives Establish the Tribes current energy usage Identify available renewable energy and energy efficiency options Assess the available options versus the goals and objectives Create an action plan for the selected options

Souther Carolina Institute of energy Studies-Robert Leitner

2009-01-30T23:59:59.000Z

75

Wide band stepped frequency ground penetrating radar  

DOE Patents (OSTI)

A wide band ground penetrating radar system (10) embodying a method wherein a series of radio frequency signals (60) is produced by a single radio frequency source (16) and provided to a transmit antenna (26) for transmission to a target (54) and reflection therefrom to a receive antenna (28). A phase modulator (18) modulates those portion of the radio frequency signals (62) to be transmitted and the reflected modulated signal (62) is combined in a mixer (34) with the original radio frequency signal (60) to produce a resultant signal (53) which is demodulated to produce a series of direct current voltage signals (66) the envelope of which forms a cosine wave shaped plot (68) which is processed by a Fast Fourier Transform unit 44 into frequency domain data (70) wherein the position of a preponderant frequency is indicative of distance to the target (54) and magnitude is indicative of the signature of the target (54).

Bashforth, Michael B. (Buellton, CA); Gardner, Duane (Santa Maria, CA); Patrick, Douglas (Santa Maria, CA); Lewallen, Tricia A. (Ventura, CA); Nammath, Sharyn R. (Santa Barbara, CA); Painter, Kelly D. (Goleta, CA); Vadnais, Kenneth G. (Alexandria, VA)

1996-01-01T23:59:59.000Z

76

The Origin of the Mercury Bands at 2480A  

Science Journals Connector (OSTI)

The group of eight mercury bands near 2480A was photographed under varied excitation conditions with the purpose of determining their origin. The source was a discharge through mercury vapor produced in a quartz tube through external electrodes by a low-voltage Tesla coil. Five tubes containing distilled mercury and commercial mercury arc lamp showed this group of bands. These bands were weakened by heat along with known mercury bands. The origin is undoubtedly some form of mercury molecule. The most probable forms are Hg2+ and Hg2. Five observations favor Hg2+ over Hg2. (1) These bands have never been observed in fluorescence. (2) The 2476 band is more intense than the 2345 Hg2 band under strong field excitation but weaker than 2345 under low field excitation. (3) No other bands with properties like those of the 2480 group have been observed in the mercury spectrum and Rayleigh has shown that these bands do not occur in absorption. (4) The bands in this group may be classified as sequences v?-v??=0123, and a lower limit for D of 0.3 volts estimated. (5) In the v?-v??=0 sequence, emission is observed from state v?=41 indicating molecules with very high vibrational energy. This energy may be supplied by the electric field if the emitter is an ion but not if it is a neutral molecule.

J. Gibson Winans

1932-12-15T23:59:59.000Z

77

Lifetime measurements of Triaxial Strongly Deformed bands in $^{163}$Tm  

E-Print Network (OSTI)

With the Doppler Shift Attenuation Method, quadrupole transition moments, $Q_t$, were determined for the two recently proposed Triaxial Strongly Deformed (TSD) bands in $^{163}$Tm. The measured $Q_t$ moments indicate that the deformation of these bands is larger than that of the yrast, signature partners. However, the measured values are smaller than those predicted by theory. This observation appears to be valid for TSD bands in several nuclei of the region

X. wang; R. V. F. Janssens; E. F. Moore; U. Garg; Y. Gu; S. Frauendorf; M. P. Carpenter; S. S. Ghugre; N. J. Hammond; T. Lauritsen; T. Li; G. Mukherjee; N. S. Pattabiraman; D. Seweryniak; S. Zhu

2007-05-14T23:59:59.000Z

78

Engineering the Electronic Band Structure for Multiband Solar Cells  

Science Journals Connector (OSTI)

Using the unique features of the electronic band structure of GaNxAs1-x alloys, we have designed, fabricated and tested a multiband photovoltaic device. The device demonstrates an optical activity of three energy bands that absorb, and convert into electrical current, the crucial part of the solar spectrum. The performance of the device and measurements of electroluminescence, quantum efficiency and photomodulated reflectivity are analyzed in terms of the band anticrossing model of the electronic structure of highly mismatched alloys. The results demonstrate the feasibility of using highly mismatched alloys to engineer the semiconductor energy band structure for specific device applications.

N. Lpez; L. A. Reichertz; K. M. Yu; K. Campman; W. Walukiewicz

2011-01-10T23:59:59.000Z

79

Properties of the rotational bands in {sup 161}Er  

SciTech Connect

High-spin states in {sup 161}Er have been studied experimentally using the {sup 150}Nd({sup 16}O,5n) reaction at a beam energy of 86 MeV. The 5/2{sup +}[642], 3/2{sup -}[521], and 11/2{sup -}[505] bands are extended up to high-spin states, and particularly the {alpha}=-1/2 branch of the ground state 3/2{sup -}[521] band is revised significantly. The relatively enhanced E1 transitions from the 3/2{sup -}[521] band to the 5/2{sup +}[642] band are observed. The band properties are analyzed within the framework of a triaxial particle-rotor model, and near-prolate shape and triaxial deformation are proposed to the 3/2{sup -}[521] and 5/2{sup +}[642] bands, respectively. Signature inversion occurs in the 3/2{sup -}[521] band after the band crossing in {sup 161}Er, and the systematics of the signature inversion associated with the 3/2{sup -}[521] configuration are discussed. By analyzing the properties of the relatively enhanced E1 transitions, it is found that the R(E1/E2) values show angular momentum dependence before the band crossing, and these enhanced E1 transitions could be attributed to octupole softness.

Chen, L.; Zhou, X. H.; Wang, S. T.; Zhang, N. T.; Zhou, H. B.; Li, G. S.; Wang, H. X.; Ding, B. [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Graduate University of Chinese Academy of Sciences, Beijing 100049 (China); Zhang, Y. H.; Zheng, Y.; Liu, M. L.; Ma, F.; Fang, Y. D.; Hua, W.; Guo, S.; Qiang, Y. H.; Lei, X. G.; Guo, Y. X. [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Zhu, L. H.; Wu, X. G. [China Institute of Atomic Energy, Beijing 102413 (China)

2011-03-15T23:59:59.000Z

80

Substrate-Induced Band-Gap Opening in Epitaxial Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Prospective challengers to silicon, the long-reigning king of semiconductors for computer chips and other electronic...

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

ARM - Radiative Heating in Underexplored Bands Campaign-II (RHUBC...  

NLE Websites -- All DOE Office Websites (Extended Search)

Eli Mlawer, Principal Investigator Dave Turner, Principal Investigator Radiative Heating in Underexplored Bands Campaign-II (RHUBC-II) At an elevation of more than 5000...

82

ARM - Radiative Heating in Underexplored Bands Campaign (RHUBC...  

NLE Websites -- All DOE Office Websites (Extended Search)

Contacts News ARM Press Release (Feb. 26, 2007) Images flickrdots Radiative Heating in Underexplored Bands Campaign (RHUBC) Now available: RHUBC-II website Between...

83

Method for Creating Photonic Band Gap Materials - Energy Innovation...  

NLE Websites -- All DOE Office Websites (Extended Search)

a photonic band gap. These microstructures have the potential to change the way optoelectronic devices, such as photodiodes, LEDs, and integrated optical circuit elements, are...

84

Engineering the Electronic Band Structure for Multiband Solar Cells  

SciTech Connect

Using the unique features of the electronic band structure of GaNxAs1-x alloys, we have designed, fabricated and tested a multiband photovoltaic device. The device demonstrates an optical activity of three energy bands that absorb, and convert into electrical current, the crucial part of the solar spectrum. The performance of the device and measurements of electroluminescence, quantum efficiency and photomodulated reflectivity are analyzed in terms of the Band Anticrossing model of the electronic structure of highly mismatched alloys. The results demonstrate the feasibility of using highly mismatched alloys to engineer the semiconductor energy band structure for specific device applications.

Lopez, N.; Reichertz, L.A.; Yu, K.M.; Campman, K.; Walukiewicz, W.

2010-07-12T23:59:59.000Z

85

Annual Growth Bands in Hymenaea courbaril  

SciTech Connect

One significant source of annual temperature and precipitation data arises from the regular annual secondary growth rings of trees. Several tropical tree species are observed to form regular growth bands that may or may not form annually. Such growth was observed in one stem disk of the tropical legume Hymenaea courbaril near the area of David, Panama. In comparison to annual reference {Delta}{sup 14}C values from wood and air, the {Delta}{sup 14}C values from the secondary growth rings formed by H. courbaril were determined to be annual in nature in this one stem disk specimen. During this study, H. courbaril was also observed to translocate recently produced photosynthate into older growth rings as sapwood is converted to heartwood. This process alters the overall {Delta}{sup 14}C values of these transitional growth rings as cellulose with a higher {Delta}{sup 14}C content is translocated into growth rings with a relatively lower {Delta}{sup 14}C content. Once the annual nature of these growth rings is established, further stable isotope analyses on H. courbaril material in other studies may help to complete gaps in the understanding of short and of long term global climate patterns.

Westbrook, J A; Guilderson, T P; Colinvaux, P A

2004-02-09T23:59:59.000Z

86

Band excitation method applicable to scanning probe microscopy  

DOE Patents (OSTI)

Methods and apparatus are described for scanning probe microscopy. A method includes generating a band excitation (BE) signal having finite and predefined amplitude and phase spectrum in at least a first predefined frequency band; exciting a probe using the band excitation signal; obtaining data by measuring a response of the probe in at least a second predefined frequency band; and extracting at least one relevant dynamic parameter of the response of the probe in a predefined range including analyzing the obtained data. The BE signal can be synthesized prior to imaging (static band excitation), or adjusted at each pixel or spectroscopy step to accommodate changes in sample properties (adaptive band excitation). An apparatus includes a band excitation signal generator; a probe coupled to the band excitation signal generator; a detector coupled to the probe; and a relevant dynamic parameter extractor component coupled to the detector, the relevant dynamic parameter extractor including a processor that performs a mathematical transform selected from the group consisting of an integral transform and a discrete transform.

Jesse, Stephen; Kalinin, Sergei V

2013-05-28T23:59:59.000Z

87

Electronic materials with a wide band gap: recent developments  

Science Journals Connector (OSTI)

Usually, semiconductors with a band gap Eg 3 eV or larger are called wide band gap materials. Their optical emission can span the whole of the visible spectrum, enabling the development of devices for solid-state lighting. In addition, a large Eg results in a high electrical breakthrough field, which is interesting for high-power electronics.

Klimm, D.

2014-08-29T23:59:59.000Z

88

BAND STRUCTURE AND OPTICAL PROPERTIES OF MAGNESIUM FLUORIDE  

E-Print Network (OSTI)

595 BAND STRUCTURE AND OPTICAL PROPERTIES OF MAGNESIUM FLUORIDE C. JOUANIN, J. P. ALBERT and C'autres transitions expéri- mentales. Abstract. 2014 The electronic band structure of magnesium fluoride is calculated, only some qualitative investigations exist for the calcium and magnesium fluorides [1, 2]. This lack

Paris-Sud XI, Université de

89

Vibration-Rotation Bands of Allene-1. 1-d$_{2}$  

Science Journals Connector (OSTI)

24 February 1959 research-article Vibration-Rotation Bands of Allene-1. 1-d...the perpendicular bands to particular vibrations, some characteristic details of their...Coriolis interaction between B and B class vibrations, and the results are in general accord...

1959-01-01T23:59:59.000Z

90

Vibration-Rotation Bands of Acetylene and the Molecular Dimensions  

Science Journals Connector (OSTI)

4 December 1956 research-article Vibration-Rotation Bands of Acetylene and the...constants in the isotopic acetylenes, some vibration-rotation bands of acetylene have been...The values for each of the molecular vibrations have been re-determined, taking into...

1956-01-01T23:59:59.000Z

91

Spin Wave Energies in the Band Theory of Ferromagnetism  

Science Journals Connector (OSTI)

...1967 research-article Spin Wave Energies in the Band Theory of Ferromagnetism...made of the coefficient C in the energy CK of a spin wave of small wave vector K in a ferromagnetic...with Nagaoka's work on spin wave energies in a nearly half-filled band...

1967-01-01T23:59:59.000Z

92

THE INVERSE OF A SEMI-INFINITE SYMMETRIC BANDED MATRIX  

E-Print Network (OSTI)

algorithm 3]. The eigen- values and eigen-vectors for the nite symmetric tridiagonal case were obtainedTHE INVERSE OF A SEMI-INFINITE SYMMETRIC BANDED MATRIX D. A. LAVISy , B. W. SOUTHERNz and I. F a method for obtaining an analytic form for a class of sym- metric semi-in nite banded matrices, which are

Lavis, David

93

Analytical descriptions of the band structure of direct-band-gap zinc-blende-structure semiconductors in the k?p Kane model  

Science Journals Connector (OSTI)

In the framework of the well-known k?p Kane band theory, accurate analytical approximations of conduction- and valence-band dispersion of direct-band-gap zinc-blende-structure semiconductors are derived when the spin-orbit-splitting energy does not exceed the band-gap energy. These approximations include the interactions with the remote bands. The expressions of the eigenfunctions are also obtained. The present analysis elucidates and unifies previous analytical band descriptions.

H.-J. Drouhin and J. Peretti

1991-10-15T23:59:59.000Z

94

Substrate-Induced Band-Gap Opening in Epitaxial Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Prospective challengers to silicon, the long-reigning king of semiconductors for computer chips and other electronic devices, have to overcome silicon's superb collection of materials properties as well as sophisticated fabrication technologies refined by six decades of effort by materials scientists and engineers. Graphene, one of the latest contenders, has a rather impressive list of features of its own but has lacked a key characteristic of all semiconductors, an energy gap (band gap) in its electronic band structure. A multi-institutional collaboration under the leadership of researchers with Berkeley Lab and the University of California, Berkeley, have now demonstrated that growing an epitaxial film of graphene on a silicon carbide substrate results in a significant band gap, 0.26 electron volts (eV), an important step toward making graphene useful as a semiconductor.

95

Electron Band Structure of Solid Methane: Ab Initio Calculations  

Science Journals Connector (OSTI)

The band structure of crystalline methane has been calculated in a linear-combination-of-molecular-orbitals approximation. In this molecular tight-binding method the Bloch sums are built up of Hartree-Fock orbitals of the free molecules. Interactions between the states of different molecules are calculated directly from molecular integrals without reducing the exchange interaction to an exchange potential. The approximations involved are shown to be well justified for a crystal made of closed-shell units. The band structure is obtained by solving secular equation in 400 points along the relevant symmetry lines. The calculated bands are relatively narrow, less than 2.5 eV wide, around the molecular levels. The band-to-band gap in solid methane is 24.5 eV. This value has the same order of magnitude as in solid rare gases.

Lucjan Piela; Luciano Pietronero; Raffaele Resta

1973-06-15T23:59:59.000Z

96

Substrate-Induced Band-Gap Opening in Epitaxial Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Prospective challengers to silicon, the long-reigning king of semiconductors for computer chips and other electronic devices, have to overcome silicon's superb collection of materials properties as well as sophisticated fabrication technologies refined by six decades of effort by materials scientists and engineers. Graphene, one of the latest contenders, has a rather impressive list of features of its own but has lacked a key characteristic of all semiconductors, an energy gap (band gap) in its electronic band structure. A multi-institutional collaboration under the leadership of researchers with Berkeley Lab and the University of California, Berkeley, have now demonstrated that growing an epitaxial film of graphene on a silicon carbide substrate results in a significant band gap, 0.26 electron volts (eV), an important step toward making graphene useful as a semiconductor.

97

Highly Mismatched Alloys for Intermediate Band Solar Cells  

SciTech Connect

It has long been recognized that the introduction of a narrow band of states in a semiconductor band gap could be used to achieve improved power conversion efficiency in semiconductor-based solar cells. The intermediate band would serve as a ''stepping stone'' for photons of different energy to excite electrons from the valence to the conduction band. An important advantage of this design is that it requires formation of only a single p-n junction, which is a crucial simplification in comparison to multijunction solar cells. A detailed balance analysis predicts a limiting efficiency of more than 50% for an optimized, single intermediate band solar cell. This is higher than the efficiency of an optimized two junction solar cell. Using ion beam implantation and pulsed laser melting we have synthesized Zn{sub 1-y}Mn{sub y}O{sub x}Te{sub 1-x} alloys with x<0.03. These highly mismatched alloys have a unique electronic structure with a narrow oxygen-derived intermediate band. The width and the location of the band is described by the Band Anticrossing model and can be varied by controlling the oxygen content. This provides a unique opportunity to optimize the absorption of solar photons for best solar cell performance. We have carried out systematic studies of the effects of the intermediate band on the optical and electrical properties of Zn{sub 1-y}Mn{sub y}O{sub x}Te{sub 1-x} alloys. We observe an extension of the photovoltaic response towards lower photon energies, which is a clear indication of optical transitions from the valence to the intermediate band.

Walukiewicz, W.; Yu, K.M.; Wu, J.; Ager III, J.W.; Shan, W.; Scrapulla, M.A.; Dubon, O.D.; Becla, P.

2005-03-21T23:59:59.000Z

98

Temperatures Indicated by Intensity Distributions in Band Spectra  

Science Journals Connector (OSTI)

It is generally supposed that the intensity of any particular line in a band spectrum may be calculated from the Maxwell-Boltzmann law, assuming the gas to be in temperature equilibrium. From the results of this experimental work, it appears that under some conditions of excitation other factors than the temperature of the gas govern the intensity distribution. Measurements on the negative bands of N2+ excited in low voltage arcs in the pure gas show that at 1100K and 2800K the distribution of intensities among the rotational lines is exactly the same, whilst the admixture of helium with nitrogen alters the distribution completely and gives a much lower indicated temperature. Similar results are found with the first negative bands of CO+. The differences are accounted for by the conversion of translational energy of the electrons into rotational energy of the molecules when the bands are excited by electron impacts in the pure gas. When the bands are excited by impacts of the second kind in gas mixtures, no change in rotational energy occurs and thus the indicated temperature is much lower. The distribution of intensity among the vibrational states of the molecules has been examined for the complete system of negative bands of N2+. While almost all of the energy is concentrated in the low vibration states when the bands are excited by electron impacts, the energy is spread out towards the higher vibration states when the excitation is by collisions of the second kind with metastable helium atoms.

O. S. Duffendack; R. W. Revans; A. S. Roy

1934-06-01T23:59:59.000Z

99

Huron County, Ohio: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

6687°, -82.6483442° 6687°, -82.6483442° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.1266687,"lon":-82.6483442,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

100

Price of Port Huron, MI Liquefied Natural Gas Exports (Dollars...  

Gasoline and Diesel Fuel Update (EIA)

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2013 9.48 2014 10.66 10.66 9.74 10.09 9.74 9.85 9.85 9.85 10.86...

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Shear Banding in an F-Actin Solution  

Science Journals Connector (OSTI)

We report herein the first evidence that an F-actin solution shows shear banding, which is characterized by the spontaneous separation of homogeneous shear flow into two macroscopic domains of different definite shear rates. The constant shear stress observed in the F-actin solution is explained by the banded flow with volume fractions that obey the lever rule. Nonhomogenous reversible flows were observed in the F-actin solution with respect to upward and downward changes in the shear rate. This is the first time shear banding has been observed in a simple biomacromolecule. The biological implications and dynamic aspects of shear flow velocity characteristic patterns are discussed.

Itsuki Kunita; Katsuhiko Sato; Yoshimi Tanaka; Yoshinori Takikawa; Hiroshi Orihara; Toshiyuki Nakagaki

2012-12-10T23:59:59.000Z

102

X-Band Photonic Band-Gap Accelerator Structure Breakdown Experiment  

SciTech Connect

In order to understand the performance of photonic band-gap (PBG) structures under realistic high gradient, high power, high repetition rate operation, a PBG accelerator structure was designed and tested at X band (11.424 GHz). The structure consisted of a single test cell with matching cells before and after the structure. The design followed principles previously established in testing a series of conventional pillbox structures. The PBG structure was tested at an accelerating gradient of 65 MV/m yielding a breakdown rate of two breakdowns per hour at 60 Hz. An accelerating gradient above 110 MV/m was demonstrated at a higher breakdown rate. Significant pulsed heating occurred on the surface of the inner rods of the PBG structure, with a temperature rise of 85 K estimated when operating in 100 ns pulses at a gradient of 100 MV/m and a surface magnetic field of 890 kA/m. A temperature rise of up to 250 K was estimated for some shots. The iris surfaces, the location of peak electric field, surprisingly had no damage, but the inner rods, the location of the peak magnetic fields and a large temperature rise, had significant damage. Breakdown in accelerator structures is generally understood in terms of electric field effects. These PBG structure results highlight the unexpected role of magnetic fields in breakdown. The hypothesis is presented that the moderate level electric field on the inner rods, about 14 MV/m, is enhanced at small tips and projections caused by pulsed heating, leading to breakdown. Future PBG structures should be built to minimize pulsed surface heating and temperature rise.

Marsh, Roark A.; /MIT /MIT /NIFS, Gifu /JAERI, Kyoto /LLNL, Livermore; Shapiro, Michael A.; Temkin, Richard J.; /MIT; Dolgashev, Valery A.; Laurent, Lisa L.; Lewandowski, James R.; Yeremian, A.Dian; Tantawi, Sami G.; /SLAC

2012-06-11T23:59:59.000Z

103

WI-TRIBE-STOCKBRIDGE-MUNSEE BAND OF MOHICAN INDIANS  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

WI-TRIBE-STOCKBRIDGE-MUNSEE BAND OF MOHICAN INDIANS WI-TRIBE-STOCKBRIDGE-MUNSEE BAND OF MOHICAN INDIANS Location: Tribe WI-TRIBE- STOCKBRIDGE- MUNSEE BAND OF MOHICAN INDIANS WI American Recovery and Reinvestment Act: Proposed Action or Project Description The Stockbridge-Munsee Band of Mohican Indians proposes to conduct energy efficient audits of residential and commerical buildings. Conditions: None Categorical Exclusion(s) Applied: A9, B5.1 *-For the complete DOE National Environmental Policy Act regulations regarding categorical exclusions, see Subpart D of 10 CFR10 21 This action would not: threaten a violation of applicable statutory, regulatory, or permit requirements for environment, safety, and health, including DOE and/or Executive Orders; require siting, construction, or major expansion of waste storage, disposal, recovery, or

104

CA-TRIBE-TUOLUMNE BAND OF MEWUK INDIANS  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

TRIBE-TUOLUMNE BAND OF MEWUK INDIANS TRIBE-TUOLUMNE BAND OF MEWUK INDIANS Location: Tribe CA-TRIBE- TUOLUMNE BAND OF MEWUK INDIANS CA American Recovery and Reinvestment Act: Proposed Action or Project Description The Tuolumne Band of MeWuk Indians proposes to reduce their fossil fuel emissions through increased energy efficiency and the implementation of renewable energy where applicable. Currently, the Tribe has contracted with the Renewable and Appropriate Energy Laboratory (RAEL) of the University of California, Berkeley, to identify the most cost-effective opportunities for increased energy efficiency and renewable energy technologies. The Tribe proposes to use a portion of the funding to allocate funds to RAEL for technical consultant services to assist the Tribe in identifying, prioritizing, and coordinating site specific

105

ND-TRIBE-TURTLE MOUNTAIN BAND OF CHIPPEWA  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

ND-TRIBE-TURTLE MOUNTAIN BAND OF CHIPPEWA ND-TRIBE-TURTLE MOUNTAIN BAND OF CHIPPEWA Energy Efficiency and Conservation Block Grant Program Location: Tribe ND-TRIBE-TURTLE MOUNTAIN BAND OF CHIPPEWA ND American Recovery and Reinvestment Act: Proposed Action or Project Description The Turtle Mountain Band of Chippewa Indians of North Dakota propose to 1) explore the potential for wind energy development on the Reservation by soliciting expertise from an engineering company to determine the best option for tapping wind energy on the reservation for its public buildings and seek legal expertise to study legal barriers that may exist; 2) conduct energy audits and a feasibility study to determine if several sizeable public buildings have the potential to be sites for either district heating or a

106

?6 and ?8 infrared bands and force field of disilane  

Science Journals Connector (OSTI)

The infrared absorption spectrum of the ?6 and ?8 bands of disilane (Si2H6) was recorded at medium resolution (0.1-0.05 cm?1). A rotation analysis of the P(J) and R(J) structure of ?6 was carried out, yielding the band origin and information on the B constant of the ground and v6 = 1 states of the molecule, and on the DJ centrifugal distortion constant. About 400 transitions of the ?8 band were assigned and analysed, giving information on the band origin and the rotational constants of the v8 = 1 state. Using the new and previous information on the vibrational spectrum of Si2H6 and Si2D6, a force constant refinement was performed. Several force field models were tried and a discussion of the results is presented.

Aida Ben Altabef; Rafael Escribano

1992-01-01T23:59:59.000Z

107

Engineering the Electronic Band Structure for Multiband Solar Cells  

E-Print Network (OSTI)

Band Structure for Multiband Solar Cells N. López 1 , L. A.a number of new concepts of solar cells have been proposed.successful approach several solar cells using semiconductors

Lopez, N.

2011-01-01T23:59:59.000Z

108

An X-Band Gun Test Area at SLAC  

SciTech Connect

The X-Band Test Area (XTA) is being assembled in the NLCTA tunnel at SLAC to serve as a test facility for new RF guns. The first gun to be tested will be an upgraded version of the 5.6 cell, 200 MV/m peak field X-band gun designed at SLAC in 2003 for the Compton Scattering experiment run in ASTA. This new version includes some features implemented in 2006 on the LCLS gun such as racetrack couplers, increased mode separation and elliptical irises. These upgrades were developed in collaboration with LLNL since the same gun will be used in an injector for a LLNL Gamma-ray Source. Our beamline includes an X-band acceleration section which takes the electron beam up to 100 MeV and an electron beam measurement station. Other X-Band guns such as the UCLA Hybrid gun will be characterized at our facility.

Limborg-Deprey, C.; Adolphsen, C.; Chu, T.S.; Dunning, M.P.; Jobe, R.K.; Jongewaard, E.N.; Hast, C.; Vlieks, A.E.; Wang, F.; Walz, D.R.; /SLAC; Marsh, R.A.; Anderson, S.G.; Hartemann, F.V.; Houck, T.L.; /LLNL, Livermore

2012-09-07T23:59:59.000Z

109

Synthesis of binary images from band-limited functions  

Science Journals Connector (OSTI)

Binary images usually are produced by clipping band-limited images generated through physical systems. We examine the conditions under which a prescribed image can be formed by this...

Nashold, Karen M; Rudin, Walter; Saleh, Bahaa E A; Bucklew, James A

1989-01-01T23:59:59.000Z

110

Direct observation of a dispersionless impurity band in hydrogenated graphene  

E-Print Network (OSTI)

We show with angle-resolved photoemission spectroscopy that a new energy band appears in the electronic structure of electron-doped hydrogenated monolayer graphene (H-graphene). Its occupation can be controlled with the ...

Haberer, D.

111

ARM - Field Campaign - Radiative Heating in Underexplored Bands...  

NLE Websites -- All DOE Office Websites (Extended Search)

govCampaignsRadiative Heating in Underexplored Bands Campaign (RHUBC) Campaign Links RHUBC Website ARM Data Discovery Browse Data Comments? We would love to hear from you Send us...

112

Band Gap Optimization of Two-Dimensional Photonic Crystals Using ...  

E-Print Network (OSTI)

Jul 10, 2009 ... the dielectric material and the wave vector. .... which SDP can be well applied, thanks to its efficiency and robustness of handling this type of ...... Band diagrams plotted in the figures below show the eigenvalues moving along...

2009-07-10T23:59:59.000Z

113

Substrate-induced band gap opening in epitaxial graphene  

E-Print Network (OSTI)

H.A. Electronic states of graphene nanoribbons studied withS.G. Louie. Energy gaps in graphene nanoribbons. Phys. Rev.band-gap engineering of graphene nanoribbons. Phys. Rev.

2008-01-01T23:59:59.000Z

114

A New Electronic Band-System of BaCl  

Science Journals Connector (OSTI)

... WE have recently had occasion to photograph the emission spectra of the flames from various pyrotechnic compositions containing barium and chlorine compounds. The well-known green and ultraviolet band-systems ...

R. F. BARROW; D. V. CRAWFORD

1946-03-16T23:59:59.000Z

115

Synthesis of electromagnetic modes in photonic band gap fibers  

E-Print Network (OSTI)

In this paper, we report on the successful synthesis of three individual modes, HE11, TEo0, and TE02 for transmission in photonic band gap fibers at near infrared wavelengths. We measure the propagation losses of the HE11 ...

Hu, Qichao

2007-01-01T23:59:59.000Z

116

Environmental influences on skeletal banding in eastern Pacific (Panama) corals  

Science Journals Connector (OSTI)

The timing of skeletal band formation and concomitant changes in calcification rates and linear skeletal extension were investigated in Pavona...corals growing under two distinct thermal regimes along the Pacific...

Gerard M. Wellington; Peter W. Glynn

1983-05-01T23:59:59.000Z

117

Global estimation of precipitation using opaque microwave bands  

E-Print Network (OSTI)

This thesis describes the use of opaque microwave bands for global estimation of precipitation rate. An algorithm was developed for estimating instantaneous precipitation rate for the Advanced Microwave Sounding Unit (AMSU) ...

Chen, Frederick Wey-Min, 1975-

2004-01-01T23:59:59.000Z

118

Shape coexistence and band crossings in Pt174  

Science Journals Connector (OSTI)

High-spin states in Pt174 were populated via the Mo92(Sr84,2p) and Mo92(Sr84,2p2n) reactions. The ground-state band has been extended from I=14 to 24 (tentatively 26) and a new side band is observed up to a spin of 21 (tentatively 23). A low-frequency crossing is observed in the latter band at a rotational frequency that is similar to that seen in the ground-state band. The first and second i13?2 neutron alignments are also observed in Pt174. Surprisingly, these crossings occur at approximately the same frequency. Total Routhian surface and cranked shell model calculations are used in an attempt to understand this behavior.

J. TM. Goon; D. J. Hartley; L. L. Riedinger; M. P. Carpenter; F. G. Kondev; R. V. F. Janssens; K. H. Abu Saleem; I. Ahmad; H. Amro; J. A. Cizewski; C. N. Davids; M. Danchev; T. L. Khoo; A. Heinz; T. Lauritsen; W. C. Ma; G. L. Poli; J. Ressler; W. Reviol; D. Seweryniak; M. B. Smith; I. Wiedenhver; Jing-ye Zhang

2004-07-15T23:59:59.000Z

119

Phenomenological band structure model of magnetic coupling in semiconductors  

E-Print Network (OSTI)

Phenomenological band structure model of magnetic coupling in semiconductors Gustavo M. Dalpian a,1­18]. Several models have been proposed to explain the phenomena, including the phenomenological Zener

Gong, Xingao

120

Comparative cytotaxonomy in the tribe Bovini studied by banding techniques  

E-Print Network (OSTI)

Committee: Dr. James E. Womack Chromosomes of eight species of the tribe Bovini were studied by G ? banding, C ? banding and silver staining techniques. The results of this comparative cytogenetic study support the theory that Robertsonian fusion... in the tribe Bovini whose species appear to differ by a series of centromeric fusions. The phylogenetic tree derived from the cytogenetic data of this study is not consistent with morphological and behavioral trees previously described for the tribe Bovini...

Rich, Donna Carol

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Single-band and Dual-band Beam Switching Systems and Offset-fed Beam Scanning Reflectarray  

E-Print Network (OSTI)

The reflectarray has been considered as a suitable candidate to replace the conventional parabolic reflectors because of its high-gain, low profile, and beam reconfiguration capability. Beam scanning capability and multi-band operation...

Lee, Jungkyu

2012-07-16T23:59:59.000Z

122

E-Print Network 3.0 - affecting band 7q36 Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

band 4... -orbiting weather satellites, and the leasing of a meteorological C-band radar. Weather satellite data have been Source: Rose, William I. - Department of Geological...

123

Measurement of valence band structure in arbitrary dielectric films  

SciTech Connect

A new way of measuring the band structure of various dielectric materials using the secondary electron emission from Auger neutralization of ions is introduced. The first example of this measurement scheme is the magnesium oxide (MgO) films with respect to the application of the films in the display industries. The density of state in the valence bands of MgO film and MgO film with a functional layer (FL) deposited over a dielectric surface reveals that the density peak of film with a FL is considerably less than that of film, thereby indicating a better performance of MgO film with functional layer in display devices. The second example of the measurement is the boron-zinc oxide (BZO) films with respect to the application of the films to the development of solar cells. The measurement of density of state in BZO film suggests that a high concentration of boron impurity in BZO films may enhance the transition of electrons and holes through the band gap from the valence to the conduction band in zinc oxide crystals; thereby improving the conductivity of the film. Secondary electron emission by the Auger neutralization of ions is highly instrumental for the determination of the density of states in the valence band of dielectric materials.

Uhm, Han S., E-mail: hsuhm@kw.ac.kr [Department of Electrophysics, Kwangwoon University, 447-1 Wolgye-Dong, Nowon-Gu, Seoul 139-701 (Korea, Republic of); Choi, Eun H. [Department of Electrophysics, Kwangwoon University, 447-1 Wolgye-Dong, Nowon-Gu, Seoul 139-701 (Korea, Republic of)] [Department of Electrophysics, Kwangwoon University, 447-1 Wolgye-Dong, Nowon-Gu, Seoul 139-701 (Korea, Republic of)

2012-10-15T23:59:59.000Z

124

Correlation of conductivity and angle integrated valence band photoemission  

NLE Websites -- All DOE Office Websites (Extended Search)

Correlation of conductivity and angle integrated valence band photoemission Correlation of conductivity and angle integrated valence band photoemission characteristics in single crystal iron perovskites for 300 K < T < 800 K: Comparison of surface and bulk sensitive methods Title Correlation of conductivity and angle integrated valence band photoemission characteristics in single crystal iron perovskites for 300 K < T < 800 K: Comparison of surface and bulk sensitive methods Publication Type Journal Article Year of Publication 2010 Authors Braun, Artur, Bongjin S. Mun, Yun Sun, Z. Liu, Oliver Gröning, R. Mäder, Selma Erat, Xueyuan Zhang, Samuel S. Mao, Ekaterina Pomjakushina, Kazimierz Conder, and Thomas Graule Journal Journal of Electron Spectroscopy and Related Phenomena Volume 181 Issue 1 Pagination 56-62 Date Published 07/2013

125

W-band ARM Cloud Radar (WACR) Update and Status  

NLE Websites -- All DOE Office Websites (Extended Search)

W-band ARM Cloud Radar (WACR) Update and Status W-band ARM Cloud Radar (WACR) Update and Status PopStefanija, Ivan ProSensing, Inc. Mead, James ProSensing Inc. Widener, Kevin Pacific Northwest National Laboratory Category: Instruments Two W-band ARM Cloud Radars (WACR) have been developed for the SGP and the ARM Mobile Facility (AMF) by ProSensing. The SGP WACR was successfully deployed in the same shelter as the MMCR in 2005. It is currently collecting co-polarization and cross-polarization spectral moments (reflectivity, Doppler velocity, and spectral width) along with spectra data. The AMF WACR will be deployed with the AMF in Niamey, Niger early in 2006. We will present ingested WACR data formats available from the ARM Archive, a selected comparisons of WACR and MMCR data at SGP, and data from

126

W-Band ARM Cloud Radar - Specifications and Design  

NLE Websites -- All DOE Office Websites (Extended Search)

W-Band ARM Cloud Radar - Specifications and Design W-Band ARM Cloud Radar - Specifications and Design K. B. Widener Pacific Northwest National Laboratory Richland, Washington J. B. Mead ProSensing, Inc. Amherst, Massachusetts Abstract The Atmospheric Radiation Measurement (ARM) Program and ProSensing, Inc. have teamed to develop and deploy the W-band ARM Cloud Radar (WACR) at the SGP central facility. The WACR will be co- located with the ARM millimeter wave cloud radar (MMCR) with planned operation to begin in early 2005. This radar will complement the measurements of the MMCR and will aid in filtering out insect contamination in the data. In this poster we present the design goals, expected performance characteristics, and the detailed design for the WACR. Introduction The MMCR has been operating at the Southern Great Plains (SGP) site since 1998. It has proven to be

127

Numerical method for shear bands in ductile metal with inclusions  

SciTech Connect

A numerical method for mesoscale simulation of high strain-rate loading of ductile metal containing inclusions is described. Because of small-scale inhomogeneities, such a composite material is prone to localized shear deformation (adiabatic shear bands). The modeling framework is the Generalized Method of Cells of Paley and Aboudi [Mech. Materials, vol. 14, pp. /27-139, 1992], which ensures that the micromechanical response of the material is reflected in the behavior of the composite at the mesoscale. To calculate the effective plastic strain rate when shear bands are present, the analytic and numerical analysis of shear bands by Glimm, Plohr, and Sharp [Mech. Materials, vol. 24, pp. 31-41, 1996] is adapted and extended.

Plohr, Jee Yeon N [Los Alamos National Laboratory; Plohr, Bradley J [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

128

Lattice Boltzmann model for photonic band gap materials  

Science Journals Connector (OSTI)

An efficient technique for computing photonic band structure and defect modes is proposed based on the lattice Boltzmann model. Physically, it is a scheme based on the kinetics of the virtual microscopic process, rather than a solution of the macroscopic Maxwell equations. The method has significant advantages of being naturally suited for massively parallel machine, as well as speed and convenience, providing another methodology for photonic band gap materials and, also, for general electromagnetic scattering problems in open region when incorporated with the perfectly matched layer technique.

Zhifang Lin; Haiping Fang; Jianjun Xu; Jian Zi; Xiangdong Zhang

2003-02-07T23:59:59.000Z

129

Ultra high vacuum broad band high power microwave window  

DOE Patents (OSTI)

An improved high vacuum microwave window has been developed that utilizes high density polyethylene coated on two sides with SiOx, SiNx, or a combination of the two. The resultant low dielectric and low loss tangent window creates a low outgassing, low permeation seal through which broad band, high power microwave energy may be passed. No matching device is necessary and the sealing technique is simple. The features of the window are broad band transmission, ultra-high vacuum compatibility with a simple sealing technique, low voltage standing wave ratio, high power transmission and low cost.

Nguyen-Tuong, Viet (Seaford, VA); Dylla, III, Henry Frederick (Yorktown, VA)

1997-01-01T23:59:59.000Z

130

Ultra high vacuum broad band high power microwave window  

DOE Patents (OSTI)

An improved high vacuum microwave window has been developed that utilizes high density polyethylene coated on two sides with SiOx, SiNx, or a combination of the two. The resultant low dielectric and low loss tangent window creates a low outgassing, low permeation seal through which broad band, high power microwave energy may be passed. No matching device is necessary and the sealing technique is simple. The features of the window are broad band transmission, ultra-high vacuum compatibility with a simple sealing technique, low voltage standing wave ratio, high power transmission and low cost. 5 figs.

Nguyen-Tuong, V.; Dylla, H.F. III

1997-11-04T23:59:59.000Z

131

Electronic band structure of magnetic bilayer graphene superlattices  

SciTech Connect

Electronic band structure of the bilayer graphene superlattices with ?-function magnetic barriers and zero average magnetic flux is studied within the four-band continuum model, using the transfer matrix method. The periodic magnetic potential effects on the zero-energy touching point between the lowest conduction and the highest valence minibands of pristine bilayer graphene are exactly analyzed. Magnetic potential is shown also to generate the finite-energy touching points between higher minibands at the edges of Brillouin zone. The positions of these points and the related dispersions are determined in the case of symmetric potentials.

Pham, C. Huy; Nguyen, T. Thuong [Theoretical and Computational Physics Department, Institute of Physics, VAST, 10 Dao Tan, Ba Dinh Distr., Hanoi 10000 (Viet Nam); SISSA/International School for Advanced Study, Via Bonomea 265, I-34136 Trieste (Italy); Nguyen, V. Lien, E-mail: nvlien@iop.vast.ac.vn [Theoretical and Computational Physics Department, Institute of Physics, VAST, 10 Dao Tan, Ba Dinh Distr., Hanoi 10000 (Viet Nam); Institute for Bio-Medical Physics, 109A Pasteur, 1st Distr., Hochiminh City (Viet Nam)

2014-09-28T23:59:59.000Z

132

Localized photonic band edge modes and orbital angular momenta of light in a  

E-Print Network (OSTI)

. Johnson, A. Lagendijk, R. Righini, M. Colocci, and D. S. Wiersma, "Light transport through the band

Cao, Hui

133

The high-resolution G-banded karyotype of Sus scrofa domestica L  

E-Print Network (OSTI)

and 101 intermediate bands and subbands, according to their relative positions and staining intensities

Boyer, Edmond

134

Lavers & Jones: Band resighting errors 19 Marine Ornithology 36: 1923 (2008)  

E-Print Network (OSTI)

Lavers & Jones: Band resighting errors 19 Marine Ornithology 36: 19­23 (2008) 19 INTRODUCTION identifiable (Anderson et al. 1985, Pollock 1991). Band wear and loss clearly violate these assumptions and to incorporate factors such as band loss and band wear into survival analyses (Schwarz & Stobo 1999, Conn et al

Jones, Ian L.

135

Status Report and Proposal Concerning the Supply of Depleted Uranium Metal Bands for a Particle Detector  

E-Print Network (OSTI)

Status Report and Proposal Concerning the Supply of Depleted Uranium Metal Bands for a Particle Detector

1980-01-01T23:59:59.000Z

136

Shear bands in a bulk metallic glass after large plastic deformation  

SciTech Connect

A transmission electron microscopy investigation is conducted to trace shear bands in a Zr{sub 53}Cu{sub 18.7}Ni{sub 12}Al{sub 16.3} bulk metallic glass after experiencing 4% plastic deformation. Shear band initiation, secondary shear band interactions, mature shear band broadening and the interactions of shear bands with shear-induced nanocrystals are captured. Results suggest that the plasticity of the bulk metallic glass is enhanced by complex shear bands and their interactions which accommodate large plastic strain and prevent catastrophic shear band propagation.

Qu, D.D.; Wang, Y.B.; Liao, X.Z.; Shen, J. (Harbin); (Sydney)

2012-10-23T23:59:59.000Z

137

Vorticity banding in rodlike virus suspensions Kyongok Kang,1  

E-Print Network (OSTI)

Vorticity banding in rodlike virus suspensions Kyongok Kang,1 M. P. Lettinga,1 Z. Dogic,2 and Jan K. G. Dhont1 1 Institute für Festkörper Forschung (IFF), Weiche Materie, Forschungszentrum Jülich, D

Fraden, Seth

138

Deep Intermediate-Band Surface Photometry of NGC 5907  

E-Print Network (OSTI)

We obtained very deep exposures of NGC 5907 with a Schmidt telescope, large-format CCD, and intermediate-band filters centered at 6660A and 8020A. These two filters, part of a 15-filter set, are custom-designed to avoid the brightest (and most variable) night sky lines, with the result that our images go deeper, with lower sky noise, than those taken with broad-band filters. Our errors of observation reach 1 mag/arcsec^2 at 29.00 mag/arcsec-2 in the 6660A image (= 28.7 in R-band), and 27.4 mag/arcsec^ in the 8020A image (same zero point as I-band). Fainter than R = 27 mag arcsec^, the surface brightness around NGC 5907 is strongly asymmetric, being mostly brighter the NW side of the galaxy midplane. This asymmetry rules out a halo for the origin of the faint surface brightness we see. Rather, this asymmetry is likely an artifact due to a combination of light from a faint ring around this galaxy (as described in Shang et al. 1998, ApJL 504, 23) and residual surface brightness at faint levels from stars that ou...

Zheng, Z Y; Su, H J; Burstein, D; Chen, J S

1999-01-01T23:59:59.000Z

139

Band structure and optical properties of isolated and bundled nanotubes  

E-Print Network (OSTI)

Band structure and optical properties of isolated and bundled nanotubes S. Reich , C. Thomsen , P of isolated and bundled single-walled nanotubes by ab initio calculations. Curvature effects on the electronic states depend on the chirality of the nanotube; the strongest deviations from the zone

Nabben, Reinhard

140

EER architecture specification for C band OFDM transmitter  

E-Print Network (OSTI)

EER architecture specification for C band OFDM transmitter A.Diet, C.Berland, M.Villegas, G detector and an adder. Abstract - This paper presents EER architecture specifications in the case of OFDM C are summarised via EVM (Error Vector Magnitude) values and output spectrum. Fig. 1 : EER architecture principle

Baudoin, Geneviève

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Radiation Characteristics of Tunable Graphennas in the Terahertz Band  

E-Print Network (OSTI)

, KTH Royal Institute of Technology, 16640 Kista, Sweden 5Department of Electrical Engineering in size have been predicted to radiate electromagnetic waves at the terahertz band. In this work frequencies, in the optical range. Due to the expectedly very limited power of nanosystems, the low mobility

Politècnica de Catalunya, Universitat

142

RESEARCH PAPER Compaction bands induced by borehole drilling  

E-Print Network (OSTI)

: boreholes are often drilled deep into weak porous sandstone formations for the purpose of extracting oil Introduction Boreholes drilled into the Earth's crust for facilitating the extraction of water, oil, naturalRESEARCH PAPER Compaction bands induced by borehole drilling R. Katsman ? E. Aharonov ? B. C

Einat, Aharonov

143

Population of superdeformed bands, the competition with fission, and the barrier between normal and superdeformed states  

SciTech Connect

In this paper we report on the entry points leading to superdeformed (SD) as well as normal bands. We find that, compared to normal bands, the entry spins for the SD bands are about 9 {h bar} higher, and the entry excitation energy 1--3 MeV colder. We also conclude that population of the SD bands represents successful competition against fission. SD bands in both the Dy and Hg regions are considered.

Khoo, T.L.; Janssens, R.V.F.; Moore, E.F.; Ahmad, I.; Carpenter, M.P.; Chasman, R.R.; Wolfs, F.L.H. (Argonne National Lab., IL (USA)); Beard, K.B.; Garg, U.; Ye, D. (Notre Dame Univ., IN (USA)); Benet, P.; Daly, P.J.; Grabowski, Z.W. (Purdue Univ., Lafayette, IN (USA)); Drigert, M.W. (Idaho National Engineering Lab., Idaho Falls, ID (USA))

1990-01-01T23:59:59.000Z

144

Eight-band k?p model of strained zinc-blende crystals  

Science Journals Connector (OSTI)

Second-order Lwdin perturbation theory is used to calculate the interaction matrices for an eight-band k?p model (near the ? point) of zinc-blende crystals under a uniform strain. The model treats the ?6 conduction bands, ?8 valence bands, and ?7 spin-orbit split-off bands. The model includes strain interactions arising from both the orbital and spin-orbit terms of the Hamiltonian. In addition to the usual Pikus-Bir deformation-potential constants, a, b, and d, which describe the coupling of the valence band to strain, two new deformation-potential constants arise, a and b, which describe the coupling of the conduction band to strain. The constant a couples the conduction band to hydrostatic deformations and the constant b, which results from a lack of inversion symmetry, couples the conduction band to shear deformations. The strain also introduces a k-dependent conduction-bandvalence-band mixing that is linear in strain, in wave vector, and in the momentum matrix element between the conduction and valence bands. In the absence of strain, the eight-band Kane model is recovered. Under a finite strain, in the limit of a large conduction-bandvalence-band gap and large spin-orbit splitting, the four-band Luttinger model with strain is recovered.

Thomas B. Bahder

1990-06-15T23:59:59.000Z

145

Quasiparticle band structure and density-functional theory: Single-particle excitations and band gaps in lattice models  

E-Print Network (OSTI)

ARTICLES Quasiparticle band structure and density-functional theory: Single-particle excitations-particle eigenvalues. Without rigorous basis even for the exact density-functional theory , these are often taken, eigenvalues obtained from density-functional theory DFT , and those from a corresponding LDA. Notable among

Hess, Daryl W.

146

K-band spectroscopy of the intermediate polar XY Ari  

E-Print Network (OSTI)

We present the K-band infrared spectrum of the intermediate polar XY Ari. The spectrum confirms the cataclysmic binary nature of XY Ari, showing emission lines of HeI (2.0587 microns) and the Brackett and Paschen series of HI. The broad nature of these lines suggest an origin in an accretion disc. The spectrum is strongly reddened by absorption within the molecular cloud Lynds 1457 and shows prominent absorption features from the secondary star, from which we determine a spectral type for the secondary of M0V. The secondary contributes 80 +/- 6% of the K-band light. We derive a visual extinction to XY Ari of Av = 11.5 +/- 0.3 and a distance of d=270 +/- 100 pc, placing XY Ari behind the molecular cloud.

S. P. Littlefair; V. S. Dhillon; T. R. Marsh

2001-06-20T23:59:59.000Z

147

Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries  

SciTech Connect

Structure and electronic properties of carbon nanotubes (CNTs) with grain boundaries (GBs) are investigated using density-functional calculations, where the GBs parallel and perpendicular to the tube axis are considered. Simulation results show that the GBs have a great effect on the electronic properties of the CNTs. For the GBs along the tube axis, the CNTs are narrow or zero band gap (<0.16 eV) materials, independent of the misorientation angle and diameter. For the GBs perpendicular to the tube axis, localized electronic states appear within the GBs regions, leading to a larger band gap of up to 0.6 eV. It is convenient to transport and localize the electrons and holes by engineering the GBs. These findings are of great significance for developing carbon-based nanomaterials and electronic devices.

Wang, Zhiguo; Zhou, Yungang; Zhang, Yanwen; Gao, Fei

2012-01-26T23:59:59.000Z

148

Intermediate-band Photometry of Type Ia Supernovae  

E-Print Network (OSTI)

We present optical light curves of five Type Ia supernovae (2002er, 2002fk, 2003cg, 2003du, 2003fk). The photometric observations were performed in a set of intermediate-band filters. SNe 2002er, 2003du appear to be normal SN Ia events with similar light curve shapes, while SN 2003kf shows the behavior of a brighter SN Ia with slower decline rate after maximum. The light curves of SN 2003cg is unusual; they show a fast rise and dramatic decline near maximum and do not display secondary peak at longer wavelengths during 15-30 days after maximum light. This suggests that SN 2003cg is likely to be an intrinsically subluminous, 91bg-like SN Ia. Exploration of SN Ia feature lines through intermediate-band photometry is briefly discussed.

Wang, X; Zhang, T; Li, Z; Wang, Xiaofeng; Zhou, Xu; Zhang, Tianmeng; Li, Zongwei

2004-01-01T23:59:59.000Z

149

Triaxial shape coexistence and new aligned band in Os178  

Science Journals Connector (OSTI)

High spin states in Os178 were studied by means of Ho165(Ne20,p6n)Os178 fusion evaporation reaction at a beam energy of 150?MeV, using a clover detector array. Several new transitions belonging to Os178 were placed in a level scheme and a new aligned rotational band was observed in addition to earlier known bands. Spin-parity assignments for most of the proposed levels were made using the deduced directional correlation orientation and polarization measurements for the de-exciting transitions. Experimental results are compared with the projected angular momentum deformed Hartree-Fock model calculations and cranked Woods-Saxon model calculations. This nucleus is predicted to be prolate deformed in the ground state but the ?-softness at higher excitation is revealed by the cranked Woods-Saxon model and the geometrical asymmetric model calculations.

Rajesh Kumar, I. M. Govil, A. Dhal, L. Chaturvedi, C. R. Praharaj, A. K. Rath, G. Kiran Kumar, S. K. Basu, A. Chakraborty, Krishichayan, S. Mukhopadhyay, N. S. Pattabiraman, S. S. Ghugre, and A. K. Sinha

2009-11-30T23:59:59.000Z

150

Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries  

SciTech Connect

Structure and electronic properties of carbon nanotubes (CNTs) with grain boundaries (GBs) are investigated using density-functional calculations, where the GBs parallel and perpendicular to the tube axis are considered. Simulation results show that the GBs have a great effect on the electronic properties of the CNTs. For the GBs along the tube axis, the CNTs are narrow or zero band gap (<0.16 eV) materials, independent of the misoritentaion angle and diameter. For the GBs perpendicular to the tube axis, localized electronic states appear within the GBs regions, leading to a larger band gap of up to 0.6 eV. It is convenient to transport and localize the electrons and holes by engineering the GBs. These findings are of great significance for developing carbon-based nanomaterials and electronic devices.

Wang, Zhiguo [Department of Applied Physics, University of Electronic Science and Technology of China; Zhou, Yungang [Department of Applied Physics, University of Electronic Science and Technology of China; Zhang, Yanwen [ORNL; Gao, Fei [ORNL

2011-01-01T23:59:59.000Z

151

Broad band invisibility cloak made of normal dielectric multilayer  

Science Journals Connector (OSTI)

We present the design fabrication and performance test of a quasi three-dimensional carpet cloak made of normal dielectric in the microwave regime. Taking advantage of a simple linear coordinate transformation we design a carpet cloak with homogeneous anisotropic medium and then practically realize the device with multilayer of alternating normal dielectric slabs based on the effective medium theory. As a proof-of-concept example we fabricate the carpet cloak with multilayer of FR4 dielectric slabs with air spacing. The performance of the fabricated design is verified through full-wave numerical simulation and measurement of the far-field scattering electromagnetic waves in a microwave anechoic chamber. Experimental results have demonstrated pronounced cloaking effect in a very broad band from 8 GHz to 18 GHz (whole X and Ku band) due to the low loss non-dispersive feature of the multilayerdielectricstructure.

Xiaofei Xu; Yijun Feng; Shuai Xiong; Jinlong Fan; Jun-Ming Zhao; Tian Jiang

2011-01-01T23:59:59.000Z

152

Wide-band heterodyne receiver development for effluent measurements  

SciTech Connect

Oak Ridge National Laboratory (ORNL) has been developing advanced infrared heterodyne receivers for plasma diagnostics in fusion reactors for over 20 years. Passive heterodyne radiometry in the LWIR region of the spectrum has historically been restricted by HgCdTe (MCT) detector technology to receiver bandwidths of only 2 GHz. Given typical atmospheric line widths of approximately 3 GHz, a CO{sub 2} (or isotope) laser local oscillator with an average line spacing of 50 GHz, and an MCT detector, only chemical species whose absorptions fall directly on top of laser lines can be measured. Thus, with traditional narrow-band heterodyne radiometry, much of the LWIR spectrum is missed and the less complex direct detection DIAL has been the preferred technique in remote sensing applications. Wide-band heterodyne receivers offer significant improvements in remote measurement capability. Progress at the Institute for Microstructural Sciences (IMS) at National Research Council of Canada and at ORNL in wide-band quantum-well infrared photodetectors (QIPs) and receivers is significantly enhancing the bandwidth capabilities of heterodyne radiometers. ORNL recently made measurements in the lab using QWIPs developed at IMS that demonstrate heterodyne quantum efficiencies of 5% with a heterodyne bandwidth of 7 GHz. The path forward indicates that > 10% heterodyne quantum efficiencies and 30-GHz bandwidths are achievable with current QWIP technology. With a chopped, 30-GHz passive heterodyne receiver, a much larger portion of the LWIR spectrum can now be covered. One potential advantage of wide-band heterodyne receivers for effluent measurements is to dramatically reduce the number of laser lines needed to characterize and distinguish multiple chemical species of interest. In the following paper, the authors discuss this and other implications of these new technologies to the characterization of effluents using both passive heterodyne radiometry and thermo-luminescence.

Hutchinson, D.P.; Richards, R.K.; Simpson, M.L.; Bennett, C.A. [Oak Ridge National Lab., TN (United States); Liu, H.C.; Buchanan, M. [National Research Council of Canada (Canada)

1998-05-01T23:59:59.000Z

153

Graphene on Ru(0001): Evidence for two graphene band structures  

SciTech Connect

High-resolution photoemission illustrates that the band structure of graphene on Ru(0001) exhibits a well-defined splitting. This splitting is largest with the graphene directly on the Ru(0001) substrate, whereas with a chemisorbed oxygen spacer layer between the graphene and the metal substrate, this splitting is considerably reduced. This splitting is attributed to a combination of chemical interactions between graphene and Ru(0001) and to screening of the former by the latter, not spin-orbit coupling.

Katsiev K.; Vescovo E.; Losovyj, Y.; Zhou, Z.; Liu, L.; Dowben, P.A.; Goodman, D.W.

2012-05-03T23:59:59.000Z

154

Band Tunneling through Double Barrier in Bilayer Graphene  

E-Print Network (OSTI)

By taking into account the full four band energy spectrum, we calculate the transmission probability and conductance of electrons across symmetric and asymmetric double potential barrier with a confined interlayer potential difference in bilayer graphene. For energies less than the interlayer coupling \\gamma_{1}, E \\gamma_{1}, we obtain four possible ways for transmission resulting from the two propagating modes. We compute the associated transmission probabilities as well as their contribution to the conductance, study the effect of the double barrier geometry.

Hasan A. Alshehab; Hocine Bahlouli; Abderrahim El Mouhafid; Ahmed Jellal

2014-01-20T23:59:59.000Z

155

Three-band model for exciton formation in rare-earth compounds  

Science Journals Connector (OSTI)

The possibility of exciton formation is studied in a model which allows for hybridization between a conduction band and a 4f level and which takes into account the scattering of electrons in a band of higher energy on the 4f ion. There is no direct coupling between this latter band and the conduction band. For weak scattering and in the Hartree-Fock approximation an isolated level built up from the 4f and the higher-band states appears. For sufficiently strong scattering this level broadens due to the coupling to the conduction band and becomes partially occupied. The theoretical arguments are supported by numerical calculations.

P. Erds; J. Slyom; A. St

1988-11-15T23:59:59.000Z

156

Band-structure analysis from photoreflectance spectroscopy in (Ga,Mn)As  

SciTech Connect

Modulation photoreflectance spectroscopy has been applied to study the band-structure evolution in (Ga,Mn)As epitaxial layers with increasing Mn content. Structural and magnetic properties of the layers were characterized with high-resolution X-ray diffractometry and SQUID magnetometery, respectively. The revealed results of decrease in the band-gap-transition energy in the (Ga,Mn)As layers with increasing Mn content are interpreted in terms of a disordered valence band, extended within the band gap, formed, in highly Mn-doped (Ga,Mn)As, as a result of merging the Mn-related impurity band with the host GaAs valence band.

Yastrubchak, Oksana; Gluba, Lukasz; Zuk, Jerzy [Institute of Physics, Maria Curie-Sklodowska University, 20-031 Lublin (Poland); Wosinski, Tadeusz; Andrearczyk, Tomasz; Domagala, Jaroslaw Z. [Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw (Poland); Sadowski, Janusz [Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland and MAX-Lab, Lund University, 22100 Lund (Sweden)

2013-12-04T23:59:59.000Z

157

Investigations into Cost Reductions of X-band Instrumentation  

SciTech Connect

The prohibitive costs of commercial test equipment for making fast and accurate pulsed phase and amplitude measurements at X-Band result in decreased productivity due to shortages of shared equipment across the test laboratory. In addition, most current set-ups rely on the use of pulsed power heads which do not allow for the measurement of phase thereby limiting the flexibility of available measurements. In this paper, we investigate less expensive in-house designed instrumentation based upon commercial satellite down converters and widely available logarithmic detector amplifiers and phase detectors. The techniques are used to measure X-Band pulses with widths of 50 ns to 10's of usec. We expect a dynamic range of 30-40 dB with accuracies of better than +/- 0.1 dB and +/- 1 degree of phase. We show preliminary results of the built and tested modules. Block diagrams of the down conversion scheme, and the architecture of a multi-signal X-band RF monitor and measurement system is illustrated. Measured results, and possible modifications and upgrades are presented.

Van Winkle, D.; Dolgashev, V.A.; Fox, J.D.; Tantawi, S.G.; /SLAC

2009-05-15T23:59:59.000Z

158

BATC 13-band Photometry of Open Cluster NGC 7789  

E-Print Network (OSTI)

We present 13-band CCD intermediate-band spectrophotometry of a field centered on the open cluster NGC 7789 from 400 to nearly 1000 nm, taken with Beijing-Arizona-Taiwan-Connecticut (BATC) Multi-Color Survey photometric system. By comparing observed spectral energy distributions of NGC 7789 stars with theoretical ones, the fundamental parameters of this cluster are derived: an age of $1.4\\pm0.1$ Gyr, a distance modulus $(m-M)_{0}=11.27\\pm0.04$, a reddening $E(B-V)=0.28\\pm0.02$, and a metallicity with the solar composition $Z=0.019$. When the surface density profile for member stars with limiting magnitudes of 19.0 in the BATC $e$ band ($\\lambda_{\\textrm{eff}}=4925$ \\AA) is fitted by King model, the core radius $R_{c}=7.52\\arcmin$ and the tidal radius $R_{t}=28.84\\arcmin$ are derived for NGC 7789. The observed mass function (MF) for main sequence stars of NGC 7789 with masses from 0.95 to 1.85 $M_{\\odot}$ is fitted with a power-law function $\\phi(m)\\propto m^{\\alpha}$ and the slope $\\alpha=-0.96$ is derived. S...

Wu, Zhen-Yu; Ma, Jun; Jiang, Zhao-Ji; Chen, Jian-Sheng; Wu, Jiang-Hua; 10.1086/512189

2008-01-01T23:59:59.000Z

159

A Multiple-Channel Sub-Band Transient Detection System  

SciTech Connect

We have developed a unique multiple-channel sub-band transient detection system to record transient electromagnetic signals in carrier-dominated radio environments; the system has been used to make unique observations of weak, transient HF signals. The detection system has made these observations possible through improved sensitivity compared to conventional broadband transient detection systems; the sensitivity improvement is estimated to be at least 20 dB. The increase in sensitivity has been achieved through subdivision of the band of interest (an 18 MHz tunable bandwidth) into eight sub-band independent detection channels, each with a 400 kHz bandwidth and its own criteria. The system generates a system trigger signal when a predetermined number of channels (typically five) trigger within a predetermined window of time (typically 100 ~s). Events are recorded with a broadband data acquisition system sampling at 50 or 100 Msample/s, so despite the fact that the detection system operates on portions of the signal confined to narrow bands, data acquisition is broadband. Between May and September of 1994, the system was used to detect and record over six thousand transient events in the frequency band from 3 to 30 MHz. Approximately 500 of the events have been characterized as paired bursts of radio noise with individual durations of 2 to 10 ps and separations between the bursts of 5 to 160 ps. The paired transients are typically 5 to 40 dB brighter than the background electromagnetic spectrum between carrier signals. We have termed these events SubIonospheric Pulse Pairs (SIPPS) and presently have no explanation as to their source. Our observations of SIPPS resemble observations of TransIonospheric Pulse Pairs (TIPPs) recorded by the Blackboard instrument on the ALEXIS satellite; the source of TIPP events is also unknown. Most of the recorded SIPP events do not exhibit frequency dispersion, implying propagation along a line-of-sight (groundwave) path; but seven of the pairs exhibit dispersion characteristic of skywave propagation via refraction from the ionosphere. The maximum line-of-sight observation range for radio propagation extends as far as 300 km for a source at an altitude of 5 km, and 520 km for a source at 15 km. Refraction from the ionosphere, however, may allow HF radiation to propagate around the globe. Information about the times and locations of sources, in conjunction with regional, weather maps and computer models of ionospheric propagation, suggest that some SIPP events originate in the vicinity of large-scale thunderstorm complexes.

David A. Smith

1998-11-01T23:59:59.000Z

160

Graphene-based tunable terahertz and infrared band-pass filter  

Science Journals Connector (OSTI)

This paper presents a sheet of graphene as a simple band-pass filter in terahertz and infrared frequencies. The central frequency and quality factor of this band-pass filter can be...

Danaeifar, M; Granpayeh, N; Mohammadi, A; Setayesh, A

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

The Near Infrared Absorption Band of Liquid Water at 1.79?  

Science Journals Connector (OSTI)

The near infrared absorption band of liquid water at 1.79? has been studied at various temperatures. No apparent changes in the band were detected in the temperature range from 4C to 137C.

J. R. Collins

1937-07-15T23:59:59.000Z

162

Theoretical basis for the scleral expansion band procedure for surgical reversal of presbyopia (SRP)  

Science Journals Connector (OSTI)

A new technique, the scleral expansion band procedure, has been developed for the surgical reversal of presbyopia. The effects of scleral expansion band are based on a recently developed theory by Schachar, wh...

Ronald A. Schachar MD; PhD

2000-12-01T23:59:59.000Z

163

Theoretical basis for the scleral expansion band procedure for surgical reversal of presbyopia [SRP  

Science Journals Connector (OSTI)

A new technique, the scleral expansion band procedure, has been developed for the surgical reversal of presbyopia. An understanding of demonstrable clinical effects of the scleral expansion band procedure, bas...

Ronald A. Schachar MD; PhD

2001-03-01T23:59:59.000Z

164

Pressure Behaviour of the UV and Green Emission Bands in ZnO...  

NLE Websites -- All DOE Office Websites (Extended Search)

Pressure Behaviour of the UV and Green Emission Bands in ZnO Micro-rods. Pressure Behaviour of the UV and Green Emission Bands in ZnO Micro-rods. Abstract: The pressure behavior of...

165

Experimental study of shear and compaction band formation in berea sandstone  

E-Print Network (OSTI)

changes in the AE rate, and are consistent with the formation of compacting shear bands at higher mean stress. Predictions of changes in band orientation with mean stress are largely consistent with observed trends, but deviate from the observed...

Herrin, Elizabeth Anne

2009-05-15T23:59:59.000Z

166

Optical absorption and band gap reduction in (Fe1-xCrx)2O3 solid...  

NLE Websites -- All DOE Office Websites (Extended Search)

Optical absorption and band gap reduction in (Fe1-xCrx)2O3 solid solutions: A first-principles study. Optical absorption and band gap reduction in (Fe1-xCrx)2O3 solid solutions: A...

167

Band structures Optical absorption Summary Key concepts in Density Functional Theory (II)  

E-Print Network (OSTI)

Band structures Optical absorption Summary Key concepts in Density Functional Theory (II) Kohn, Belfast Key concepts in Density Functional Theory (II) Silvana Botti #12;Band structures Optical in Density Functional Theory (II) Silvana Botti #12;Band structures Optical absorption Summary Outline 1 From

Botti, Silvana

168

The PortevinLe Chatelier (PLC) effect and shear band formation in an AA5754 alloy  

E-Print Network (OSTI)

The Portevin­Le Chatelier (PLC) effect and shear band formation in an AA5754 alloy Herdawandi Halim in order to observe Portevin­Le Chatelier (PLC) band behaviour during tensile deformation of AA5754 sheet and subsequently to measure the level of incre- mental plastic strain carried within the bands. In addition, PLC

Niewczas, Marek

169

ensl-00109517,version1-24Oct2006 Superconducting instability in 3 bands metallic nanotubes  

E-Print Network (OSTI)

ensl-00109517,version1-24Oct2006 Superconducting instability in 3 bands metallic nanotubes David on small radius nanotubes, we study the superconducting in- stabilities of cylindrical (5,0) nanotubes. According to band structure calculations, these nanotubes possess three bands at the Fermi energy. Using

170

Loops of Energy Bands for Bloch Waves in Optical Lattices By Matt Coles and Dmitry Pelinovsky  

E-Print Network (OSTI)

Loops of Energy Bands for Bloch Waves in Optical Lattices By Matt Coles and Dmitry Pelinovsky We the energy bands for Bloch waves in optically trapped Bose­Einstein condensates. The comparison between in this context. These bifurcations generate loops in the energy bands of the Bloch waves near the ends

Pelinovsky, Dmitry

171

Narrow band region-based active contours and surfaces for 2D and 3D segmentation  

Science Journals Connector (OSTI)

We describe a narrow band region approach for deformable curves and surfaces in the perspective of 2D and 3D image segmentation. Basically, we develop a region energy involving a fixed-width band around the curve or surface. Classical region-based methods, ... Keywords: Active contour, Active surface, Deformable model, Level sets, Narrow band region energy, Segmentation

Julien Mille

2009-09-01T23:59:59.000Z

172

Dual-Band and Dual-Polarization Patch Antenna with High Isolation Characteristic  

E-Print Network (OSTI)

1 Dual-Band and Dual-Polarization Patch Antenna with High Isolation Characteristic Dong-Hyuk Choi and Seong-Ook Park, Member, IEEE Abstract--A patch antenna with dual-band and dual-polarization operation--Coplanar waveguide (CPW) resonant cell, dual-band, dual-polarization, isolation, patch antenna I. INTRODUCTION

Park, Seong-Ook

173

Getting simultaneous red and near infrared bands from a single digital camera for plant monitoring applications  

E-Print Network (OSTI)

Getting simultaneous red and near infrared bands from a single digital camera for plant monitoring including red and near-infrared bands have proved their efficiency for vegetation-soil discrimination an original solution to obtain simultaneously the near-infrared and red bands from a standard RGB camera

Paris-Sud XI, Université de

174

The X-band klystron program at SLAC  

SciTech Connect

The X-band rf source development at SLAC can be considered a qualified success. A total of twelve klystrons were built. Six of them are still in use. The latest tube, XL4, produced 75 MW at an efficiency of 47.5 percent. However, victory cannot be declared as yet, since an NLC prototype has not been fully designed and the decision between permanent magnet focusing and a super-conducting solenoid has not been formally made. Daryl Sprehn`s paper will present the status of the PPM klystron development. The authors believe that a PPM X-band source will work, at 50 as well as at 75 megawatts. But they are prepared to adapt the XL4 design to a super-conducting solenoid, should the PPM klystron develop unexpected problems. The SLAC program is now in its seventh year. It may well be the longest and most expensive microwave tube development on record, in a government laboratory or in industry. Direct and related costs for the total effort are probably of the order of $10 million. In these circumstances it is perhaps not surprising that it has been possible to produce a klystron with the performance of XL4. At the same time, it must be said that the necessary leap in technology from the SLAC 60-megawatt S-band production klystrons to a klystron of comparable performance at four times the frequency could not be realized without some very careful experimentation and, most importantly, without the infrastructure for tube fabrication and testing available at SLAC. The design of an 11.4 GHz 50--100 MW klystron, with microsecond pulses and a pulse repetition frequency of 180 Hz presents a number of technical challenges which are listed here.

Caryotakis, G.

1996-04-01T23:59:59.000Z

175

Population of superdeformed bands and competition with fission  

SciTech Connect

Average entry points for superdeformed (SD) and normal states have been measured in {sup 191, 192}Hg and in {sup 152}Dy. Compared with normal states, the superdeformed states have entry spins {approximately} 10 h higher and internal excitation energies (U = E --- E{sub yrast}) at least 2 MeV lower for the Hg cases and about 8 MeV lower for {sup 152}Dy. By comparison with calculated {ell}- distributions of evaporation residues (ER), using CASCADE to compute the fission competition, we find that the initial population of the SD band in {sup 192}Hg originates from the tail of the ER spin distribution. 12 refs., 5 figs.

Moore, E.F.; Janssens, R.V.F.; Khoo, T.L.; Ahmad, I.; Carpenter, M.P.; Chasman, R.R.; Wolfs, F.L.H. (Argonne National Lab., IL (USA)); Beard, K.B; Garg, U.; Ye, D. (Notre Dame Univ., IN (USA)); Benet, Ph.; Daly, P.J.; Grabowski, Z.W. (Purdue Univ., Lafayette, IN (USA)); Drigert, M.W. (Idaho National Engineering Lab., Idaho Falls, ID (USA))

1990-01-01T23:59:59.000Z

176

VIMOS total transmission profiles for broad-band filters  

E-Print Network (OSTI)

VIMOS is a wide-field imager and spectrograph mounted on UT3 at the VLT, whose FOV consists of four 7'x8' quadrants. Here we present the measurements of total transmission profiles -- i.e. the throughput of telescope + instrument -- for the broad band filters U, B, V, R, I, and z for each of its four quadrants. Those measurements can also be downloaded from the public VIMOS web-page. The transmission profiles are compared with previous estimates from the VIMOS consortium.

S. Mieske; M. Rejkuba; S. Bagnulo; C. Izzo; G. Marconi

2007-04-13T23:59:59.000Z

177

Wide band cryogenic ultra-high vacuum microwave absorber  

DOE Patents (OSTI)

An absorber wave guide assembly for absorbing higher order modes of microwave energy under cryogenic ultra-high vacuum conditions, that absorbs wide-band multi-mode energy. The absorber is of a special triangular shape, made from flat tiles of silicon carbide and aluminum nitride. The leading sharp end of the absorber is located in a corner of the wave guide and tapers to a larger cross-sectional area whose center is located approximately in the center of the wave guide. The absorber is relatively short, being of less height than the maximum width of the wave guide.

Campisi, Isidoro E. (Newport News, VA)

1992-01-01T23:59:59.000Z

178

Wide band cryogenic ultra-high vacuum microwave absorber  

DOE Patents (OSTI)

An absorber waveguide assembly for absorbing higher order modes of microwave energy under cryogenic ultra-high vacuum conditions, that absorbs wide-band multi-mode energy. The absorber is of a special triangular shape, made from flat tiles of silicon carbide and aluminum nitride. The leading sharp end of the absorber is located in a corner of the waveguide and tapers to a larger cross-sectional area whose center is located approximately in the center of the wave guide. The absorber is relatively short, being of less height than the maximum width of the waveguide. 11 figs.

Campisi, I.E.

1992-05-12T23:59:59.000Z

179

ZnO/Sn:In2O3 and ZnO/CdTe band offsets for extremely thin absorber...  

NLE Websites -- All DOE Office Websites (Extended Search)

ZnOSn:In2O3 and ZnOCdTe band offsets for extremely thin absorber photovoltaics . ZnOSn:In2O3 and ZnOCdTe band offsets for extremely thin absorber photovoltaics . Abstract: Band...

180

Partially filled intermediate band of Cr-doped GaN films  

SciTech Connect

We investigated the band structure of sputtered Cr-doped GaN (GaCrN) films using optical absorption, photoelectron yield spectroscopy, and charge transport measurements. It was found that an additional energy band is formed in the intrinsic band gap of GaN upon Cr doping, and that charge carriers in the material move in the inserted band. Prototype solar cells showed enhanced short circuit current and open circuit voltage in the n-GaN/GaCrN/p-GaN structure compared to the GaCrN/p-GaN structure, which validates the proposed concept of an intermediate-band solar cell.

Sonoda, S. [Department of Electronics, Kyoto Institute of Technology, Kyoto 606-8585 (Japan)

2012-05-14T23:59:59.000Z

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

A study of the band envelopes of the 2900 A system of sulphur dioxide  

E-Print Network (OSTI)

Parameters with their Corresponding D(A " B) ~ ~ ~ ~ ~ 0 2) LIST OF FIGURES Figure Page Bands Located a$ 33&340. 7 cm. and 32 ' 879 ' 9 orna ~ & ~ & ~ ~ ~ ~ ~ ~ 8 Bands Near the Origin of the 2900 R System, ~ ~ ~ , 9 Graph of hV vs& Ordinal Numbers... with overlapping bands arising from low-lying excited vibrational levels of the ground state Only two bands~ whose heads are -1 located at 32, 879. 9 and 33, 340. 7 cm. , aze clear enough for a rotational analysis. These bands have sub-heads at 32, 895. 7 -1...

Cesani, Fernando A

1960-01-01T23:59:59.000Z

182

Wide-band neutrino beams at 1000 GeV  

SciTech Connect

In a previous publication, S. Mori discussed various broad-band neutrino and antineutrino beams using 1000 GeV protons on target. A new beam (SST) has been designed which provides the same neutrino flux as the quadrupole triplet (QT) while suppressing the wrong sign flux by a factor of 18. It also provides more than twice as much high energy antineutrino flux than the sign-selected bare target (SSBT) and in addition, has better neutrino suppression. While it is possible to increase the flux obtained from the single horn system over that previously described, the conclusion which states any horn focussing system seems to be of marginal use for Tevatron neutrino physics, is unchanged. Neutrino and antineutrino event rates and wrong sign backgrounds were computed using NUADA for a 100 metric ton detector of radius 1.5 meters. Due to radiation considerations and the existing transformer location, the horn beam is placed in its usual position inside the Target Tube. All other beams are placed in Fronthall. Thus, for the wide-band Fronthall trains a decay distance of 520 meters is used, versus 400 meters for the horn train. (WHK)

Malensek, A.; Stutte, L.

1983-04-11T23:59:59.000Z

183

F Band in Isotopically Enriched LiF  

Science Journals Connector (OSTI)

The effect of isotopic composition on the optical obsorption spectrum of the F center in LiF has been investigated. The results of measurements on single crystals of x-ray irradiated Li6F (almost 96% lithium-6) and Li7F (almost 100% lithium-7) indicate that the average F-band width at half-maximum in the former is larger by about 3% at liquid-helium temperature, and by about 1% at room temperature. Theory shows that the half-widths in the two isotopic forms vary inversely as the fourth root of the mass of the alkali ions at low temperature, and as the temperature is increased the predicted half-width difference monotonically decreases to zero. The predicted half-width difference at low temperatures is about 4%, and at room temperature about 1%, both in reasonable agreement with experiment. At both room and liquid-helium temperatures the position of the F-band maximum in Li7F is slightly displaced to higher energy than in Li6F. The peak-position shift is in approximate agreement with the contributions arising from the difference in alkali mass and lattice constant of the two crystals as estimated at low temperature.

Herbert Rabin and Michael Reich

1964-07-06T23:59:59.000Z

184

Hoyle band and $?$ condensation in ${^{12}{\\rm C}}$  

E-Print Network (OSTI)

The excited states in ${^{12}{\\rm C}}$ are investigated by using an extended version of the so-called Tohsaki-Horiuchi- Schuck-R\\"opke (THSR) wave function, where both the $3\\alpha$ condensate and ${^{8}{\\rm Be}} + \\alpha$ cluster asymptotic configurations are included. A new method is also used to resolve spurious continuum coupling with physical states. We focus on the structures of the "Hoyle band" states, $2_2^+$, and $4_2^+$ states, which are recently observed above the Hoyle state and of the $0_3^+$ and $0_4^+$ states, which are also quite recently identified in experiment. Their resonance parameters and decay properties are reasonably reproduced. All these states have gaslike configurations of the $3\\alpha$ clusters with larger root mean square radii than that of the Hoyle state. The Hoyle band is not simply considered to be the ${^{8}{\\rm Be}}(0^+) +\\alpha$ rotation as suggested by previous cluster model calculations, nor to be a rotation of a rigid-body triangle-shaped object composed of the $3\\alpha$ particles. This is mainly due to the specificity of the Hoyle state, which has the $3\\alpha$ condensate structure and gives a rise to the $0_3^+$ state with a prominent ${^{8}{\\rm Be}}(0^+)+\\alpha$ structure as a result of very strong monopole excitation from the Hoyle state.

Y. Funaki

2014-08-25T23:59:59.000Z

185

U.S. Department of Energy NEPA Categorical Exclusion Determination Form  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

MI-TRIBE-NOTTAWASEPPI HURON BAND OF THE POTAWATOMI MI-TRIBE-NOTTAWASEPPI HURON BAND OF THE POTAWATOMI Location: Tribe MI-TRIBE- NOTTAWASEPPI HURON BAND OF THE POTAWATOMI MI American Recovery and Reinvestment Act: Proposed Action or Project Description 1) Funds for incremental costs associated with building three LEED certified homes on the Pine Creek Reservation and acquiring technical services for project management services for their construction (incremental costs are for purchasing materials for foundation walls, lumber [sealants and energy heel truss], additional framing required, geothermal heat pump, plumbing, insulation, landscaping, LEED supervision and general conditions) Conditions: None Categorical Exclusion(s) Applied: A9, B5.1 *-For the complete DOE National Environmental Policy Act regulations regarding categorical exclusions, see Subpart D of 10 CFR10 21

186

Modeling of strained quantum wires using eight-band k?p theory  

Science Journals Connector (OSTI)

We have calculated numerically the one-dimensional band structure and densities of states of a V-shaped In0.2Ga0.8As/AlxGa1-xAs single quantum wire using eight-band k?p theory. A finite-difference scheme is used for the calculations. The model includes the realistic orientation, shape, material composition, strain distribution, and piezoelectric charging of the wire. We find a dominant impact of the piezoelectric potential on the band structure and a marked spin splitting of the valence bands. Also, the conduction band is strongly nonparabolic. We propose an efficient procedure to calculate interior eigenvectors from Hamiltonians including conduction-bandvalence-band interactions. This algorithm is 2090 times faster than the best prevailing method and also applies to other Hamiltonians for the modeling of nanostructures, including those occurring in tight-binding or pseudopotential theory.

O. Stier and D. Bimberg

1997-03-15T23:59:59.000Z

187

Nanodopant-Induced Band Modulation in AgPbmSbTe2+m-Type Nanocomposites  

SciTech Connect

We elucidate the fundamental physics of nanoscale dopants in narrow band-gap thermoelectric nanocomposites XPbmYTe2+m (X=Ag,Na; Y=Sb,Bi) using first-principles calculations. Our re- sults unveil distinct band-structure modulations, most notably a sizable band-gap widening driven by nanodopant-induced lattice strain and a band split-off at the conduction band minimum caused by the spin-orbit interaction of the dopant Sb or Bi atoms. Boltzmann transport calculations demon- strate that these band modulations have significant but competing effects on high-temperature elec- tron transport behavior. These results offer insights for understanding recent experimental findings and suggest principles for optimizing thermoelectric properties of narrow band-gap semiconductors.

Zhang, Yi [University of Nevada, Las Vegas; Ke, Xuezhi [University of Nevada, Las Vegas; Chen, Changfeng [University of Nevada, Las Vegas; Yang, Jihui [General Motors Corporation-R& D; Kent, Paul R [ORNL

2011-01-01T23:59:59.000Z

188

Strained-Si1-xGex/Si Band-to-Band Tunneling Transistors: Impact of Tunnel-Junction Germanium Composition and Doping Concentration on Switching Behavior  

E-Print Network (OSTI)

Strained pseudomorphic Si/Si [subscript 1-x]Ge [subscript x]/Si gate-controlled band-to-band tunneling (BTBT) devices have been analyzed with varying Ge composition up to 57% and p+ tunnel-junction (source) doping concentration ...

Antoniadis, Dimitri A.

189

Engineering integrated pure narrow-band photon sources  

E-Print Network (OSTI)

Engineering and controlling well defined states of light for quantum information applications is of increasing importance as the complexity of quantum systems grows. For example, in quantum networks high multi-photon interference visibility requires properly devised single mode sources. In this paper we propose a spontaneous parametric down conversion source based on an integrated cavity-waveguide, where single narrow-band, possibly distinct, spectral modes for the idler and the signal fields can be generated. This mode selection takes advantage of the clustering effect, due to the intrinsic dispersion of the nonlinear material. In combination with a CW laser and fast detection, our approach provides a means to engineer a source that can efficiently generate pure photons, without filtering, that is compatible with long distance quantum communication. Furthermore, it is extremely flexible and could easily be adapted to a wide variety of wavelengths and applications.

Enrico Pomarico; Bruno Sanguinetti; Clara I. Osorio; Harald Herrmann; Rob Thew

2011-08-29T23:59:59.000Z

190

G-Band Vapor Radiometer Profiler (GVRP) Handbook  

SciTech Connect

The G-Band Vapor Radiometer Profiler (GVRP) provides time-series measurements of brightness temperatures from 15 channels between 170 and 183.310 GHz. Atmospheric emission in this spectral region is primarily due to water vapor, with some influence from liquid water. Channels between 170.0 and 176.0 GHz are particularly sensitive to the presence of liquid water. The sensitivity to water vapor of the 183.31-GHz line is approximately 30 times higher than at the frequencies of the two-channel microwave radiometer (MWR) for a precipitable water vapor (PWV) amount of less than 2.5 mm. Measurements from the GVRP instrument are therefore especially useful during low-humidity conditions (PWV < 5 mm). In addition to integrated water vapor and liquid water, the GVRP can provide low-resolution vertical profiles of water vapor in very dry conditions.

Caddeau, MP

2010-06-23T23:59:59.000Z

191

W-band ARM Cloud Radar (WACR) Handbook  

SciTech Connect

The W-band Atmospheric Radiation Measurement (ARM) Program Cloud Radar (WACR) systems are zenith pointing Doppler radars that probe the extent and composition of clouds at 95.04 GHz. The main purpose of this radar is to determine cloud boundaries (e.g., cloud bottoms and tops). This radar reports estimates for the first three spectra moments for each range gate up to 15 km. The 0th moment is reflectivity, the 1st moment is radial velocity, and the 2nd moment is spectral width. Also available are the raw spectra files. Unlike the millimeter wavelength cloud radar (MMCR), the WACR does not use pulse coding and operates in only copolarization and cross-polarization modes.

Widener, KB; Johnson, K

2005-01-05T23:59:59.000Z

192

Wide-band coherent receiver development for enhanced surveillance  

SciTech Connect

Oak Ridge National Laboratory (ORNL) has been developing advanced coherent IR heterodyne receivers for plasma diagnostics in fusion reactors for over 20 years. Recent progress in wide band IR detectors and high speed electronics has significantly enhanced the measurement capabilities of coherent receivers. In addition, developments in new HgCdTe and quantum well IR photodetector (QWIP) focal plane arrays are providing the possibility of both active and passive coherent imaging. In this paper the authors discuss the implications of these new enabling technologies to the IR remote sensing community for enhanced surveillance. Coherent receivers, as opposed to direct or thermal detection, provide multiple dimensions of information about a scene or target in a single detector system. Combinations of range, velocity, temperature, and chemical species information are all available from a coherent heterodyne receiver. They present laboratory data showing measured noise equivalent power (NEP) of new QWIP detectors with heterodyne bandwidths greater than 7 GHz. For absorption measurements, a wide band coherent receiver provides the capability of looking between CO{sub 2} lines at off-resonance peaks and thus the measurement of lines normally inaccessible with conventional heterodyne or direct detection systems. Also described are differential absorption lidar (DIAL) and Doppler laboratory measurements using an 8 x 8 HgCdTe focal plane array demonstrating the snapshot capability of coherent receiver detector arrays for enhanced chemical plume and moving hardbody capture. Finally they discuss a variety of coherent receiver configurations that can suppress (or enhance) sensitivity of present active remote sensing systems to speckle, glint, and other measurement anomalies.

Simpson, M.L.; Richards, R.K.; Hutchinson, D.P.

1998-03-01T23:59:59.000Z

193

Theoretical analysis on effect of band offsets in perovskite solar cells  

Science Journals Connector (OSTI)

Abstract The effect of band offsets in CH3NH3PbI3-xClx perovskite-based solar cells with planar junction configuration was analyzed using one-dimensional device simulator. As widely known in thin-film compound solar cells, the band offset between buffer/absorber layers is a decisive factor for carrier recombination at the interface, determining open-circuit voltage (Voc). In this study, the impact of two kinds of band offsets, i.e., the conduction band offset of buffer (or blocking layer)/absorber layers and the valence band offset of absorber/hole transport material (HTM) were examined. When the conduction band of the buffer was lower than that of the absorber, the interface recombination became prominent and Voc decreased. In contrast, when the conduction band of the buffer was higher than that of the absorber by more than 0.3eV, the collection of photo-generated carriers, i.e. electron in this case, was impeded by the spike formed by the conduction band offset. Thus, the optimum position of the conduction band of the buffer was 0.0~0.3eV higher than that of the absorber. Also, the optimum position of the valence band of the HTM was derived to be 0.0~0.2eV lower than that of the absorber. These findings will be useful for new material choice and optimization of buffers and HTMs.

Takashi Minemoto; Masashi Murata

2015-01-01T23:59:59.000Z

194

Calculation of the Energy Band Diagram of a Photoelectrochemical Water Splitting Cell  

Science Journals Connector (OSTI)

Calculation of the Energy Band Diagram of a Photoelectrochemical Water Splitting Cell ... The model is based on the continuity equations for charge carriers and direct charge transfer from the energy bands to the electrolyte. ... A quantitative calculation of the position of the energy bands and the variation of the quasi-Fermi levels in the semiconductor with respect to the water reduction and oxidation potentials are presented. ...

Peter Cendula; S. David Tilley; Sixto Gimenez; Juan Bisquert; Matthias Schmid; Michael Grtzel; Jrgen O. Schumacher

2014-11-16T23:59:59.000Z

195

First identification of a collective band in the odd-odd Nb104 nucleus  

Science Journals Connector (OSTI)

The higher spin levels in neutron-rich Nb104 have been investigated from a study of the prompt ? rays in spontaneous fission of Cf252 with the Gammasphere detector array. A new collective band has been identified for the first time. This band is proposed as a semidecoupled band based on the configuration ?5/2-[303]??1/2-[541]. The other structural characteristics are discussed.

J. G. Wang (???); S. J. Zhu (???); J. H. Hamilton; A. V. Ramayya; J. K. Hwang; K. Li; Y. X. Luo; J. O. Rasmussen; I. Y. Lee; H. B. Ding (???); Q. Xu (??); L. Gu (??); S. H. Liu; C. T. Goodin; W. C. Ma

2008-07-22T23:59:59.000Z

196

E-Print Network 3.0 - appraisal band ligation Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

with bands visualized via silver staining or Coomassie Blue staining. Preparation of Synthetic DNA. A single Source: Barron, Annelise E. - Department of Bioengineering,...

197

System and Circuit Design Techniques for Silicon-based Multi-band/Multi-standard Receivers  

E-Print Network (OSTI)

values of in-band ripples. . . . . . . . . . . . . . . . . . . 100 48 Schematic-level simulation of is,RF (sRF )gm,RF Vin(sRF ) versus frequency for various IF in-band ripple. . . . . . . . . . . . . . . . . . . . . . . . . 101 49 (a) Maximum 3-dB IF... values of in-band ripples. . . . . . . . . . . . . . . . . . . 100 48 Schematic-level simulation of is,RF (sRF )gm,RF Vin(sRF ) versus frequency for various IF in-band ripple. . . . . . . . . . . . . . . . . . . . . . . . . 101 49 (a) Maximum 3-dB IF...

El-Nozahi, Mohamed A.

2011-08-08T23:59:59.000Z

198

Identification of a quasiparticle band in very neutron-rich Zr104  

Science Journals Connector (OSTI)

The high spin levels of a very neutron-rich Zr104 nucleus have been reinvestigated by measuring the prompt ? rays in the spontaneous fission of Cf252. The ground-state band has been confirmed. A new sideband has been identified with a band-head energy at 1928.7 keV. The projected shell model is employed to investigate the band structure of Zr104. The results of calculated levels are in good agreement with the experimental data, and suggest that the new band in Zr104 may be based on the neutron ?5/2-[532]??3/2+[411] configuration.

E. Y. Yeoh (???); S. J. Zhu (???); J. H. Hamilton; A. V. Ramayya; Y. X. Liu (???); Y. Sun (??); J. K. Hwang; S. H. Liu; J. G. Wang (???); Y. X. Luo; J. O. Rasmussen; I. Y. Lee; H. B. Ding (???); L. Gu (??); Q. Xu (??); Z. G. Xiao (???)

2010-08-10T23:59:59.000Z

199

Theoretical performance of solar cell based on mini-bands quantum dots  

SciTech Connect

The tremendous amount of research in solar energy is directed toward intermediate band solar cell for its advantages compared with the conventional solar cell. The latter has lower efficiency because the photons have lower energy than the bandgap energy and cannot excite mobile carriers from the valence band to the conduction band. On the other hand, if mini intermediate band is introduced between the valence and conduction bands, then the smaller energy photons can be used to promote charge carriers transfer to the conduction band and thereby the total current increases while maintaining a large open circuit voltage. In this article, the influence of the new band on the power conversion efficiency for structure of quantum dots intermediate band solar cell is theoretically investigated and studied. The time-independent Schrdinger equation is used to determine the optimum width and location of the intermediate band. Accordingly, achievement of a maximum efficiency by changing the width of quantum dots and barrier distances is studied. Theoretical determination of the power conversion efficiency under the two different ranges of QD width is presented. From the obtained results, the maximum power conversion efficiency is about 70.42%. It is carried out for simple cubic quantum dot crystal under fully concentrated light. It is strongly dependent on the width of quantum dots and barrier distances.

Aly, Abou El-Maaty M., E-mail: drabouelmaaty@hotmail.com, E-mail: ashraf.nasr@gmail.com [Power Electronics and Energy Conversion Department, ERI, NRCB (Egypt); College of Computer, Qassim University, P.O.B. 6688, Buryadah 51453 (Saudi Arabia); Nasr, A., E-mail: drabouelmaaty@hotmail.com, E-mail: ashraf.nasr@gmail.com [Radiation Engineering Department, NCRRT, Atomic Energy Authority (Egypt); College of Computer, Qassim University, P.O.B. 6688, Buryadah 51453 (Saudi Arabia)

2014-03-21T23:59:59.000Z

200

Temperature dependent band offsets in PbSe/PbEuSe quantum well heterostructures  

SciTech Connect

The band offsets of PbSe/Pb{sub 1-x}Eu{sub x}Se multi-quantum wells grown by molecular beam epitaxy are determined as a function of temperature and europium content using temperature-modulated differential transmission spectroscopy. The confined quantum well states in the valence and conduction bands are analyzed using a k{center_dot}p model with envelope function approximation. From the fit of the experimental data, the normalized conduction band offset is determined as 0.45{+-}0.15 of the band gap difference, independently of Eu content up to 14% and temperature from 20 to 300 K.

Simma, M.; Bauer, G.; Springholz, G. [Institut fuer Halbleiter und Festkoerperphysik, Johannes Kepler Universitaet, A-4040 Linz (Austria)

2012-10-22T23:59:59.000Z

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Accurate Band-Structure Calculations for the 3d Transition Metal...  

NLE Websites -- All DOE Office Websites (Extended Search)

qualitatively improve the calculated bandgap energies (see table). * Using this method, electronic structure calculations with correct d-band energies and accurate absorption...

202

Stability of graphene band structures against an external periodic perturbation: Na on graphene  

Science Journals Connector (OSTI)

The electronic structure of Na-adsorbed graphenes formed on the 6H-SiC(0001) substrate was studied using angle-resolved photoemission spectroscopy with synchrotron photons and ab initio pseudopotential calculations. It was found that the band of the graphenes sensitively changes upon Na adsorption especially at low temperature. With increasing Na dose, the ? band appears to be quickly diffused into the background at 85 K whereas it becomes significantly enhanced with its spectral intensity at room temperature (RT). A new parabolic band centered at k?1.15??1 also forms near Fermi energy with Na at 85 K while no such band was observed at RT. Such changes in the band structure are found to be reversible with temperature. The changes in the ? band of graphene are mainly driven by the Na-induced potential especially at low temperature where the potential becomes periodic due to the crystallized Na overlayer. The new parabolic band turns out to be the ? band of the underlying buffer layer partially filled by the charge transfer from Na adatoms. The increase in the hopping rate of Na adatoms at RT by 5 orders of magnitude prevents such a charge transfer, explaining the absence of the new band at RT.

C. G. Hwang; S. Y. Shin; Seon-Myeong Choi; N. D. Kim; S. H. Uhm; H. S. Kim; C. C. Hwang; D. Y. Noh; Seung-Hoon Jhi; J. W. Chung

2009-03-27T23:59:59.000Z

203

Banding Dates for Fall 2011 The Arboretum at Penn State Join us for bird banding in The Arboretum at Penn State. As the fall migrants move  

E-Print Network (OSTI)

, with the assistance of Penn State students, will be banding (weather permitting) on the following dates: Sept. 10 program. Learn more about both the migrants that stop by the Arboretum to fuel up on their way south

Guiltinan, Mark

204

Precision Magnet Measurements for X-Band Accelerator Quadrupole Triplets  

SciTech Connect

An X-band test station is being developed at LLNL to investigate accelerator optimization for future upgrades to mono-energetic gamma-ray (MEGa-Ray) technology at LLNL. Beamline magnets will include an emittance compensation solenoid, windowpane steering dipoles, and quadrupole magnets. Demanding tolerances have been placed on the alignment of these magnets, which directly affects the electron bunch beam quality. A magnet mapping system has been established at LLNL in order to ensure the delivered magnets match their field specification, and the mountings are aligned and capable of reaching the specified alignment tolerances. The magnet measurement system will be described which uses a 3-axis Lakeshore gauss probe mounted on a 3-axis translation stage. Alignment accuracy and precision will be discussed, as well as centering measurements and analysis. The dependence on data analysis over direct multi-pole measurement allows a significant improvement in useful alignment information. Detailed analysis of measurements on the beamline quadrupoles will be discussed, including multi-pole content both from alignment of the magnets, and the intrinsic level of multi-pole magnetic field.

Marsh, R A; Anderson, S G; Armstrong, J P

2012-05-16T23:59:59.000Z

205

The FORTE receiver and sub-band triggering unit  

SciTech Connect

The FORTE payload receiver and trigger unit represent a significant advance over the currently flying BLACKBEARD payload aboard the ALEXIS satellite. Not only is the polarization sensitive antenna array massive compared to the BLACKBEARD monopole, but the event triggering scheme is completely different. Electromagnetic pulses (EWs) are dispersed when they pass through the ionosphere creating a chirped frequency signal which can be helpful in discriminating between natural and man-made signals. Payloads designed to digitize and store the RF signatures of these signals must include sophisticated triggering circuitry to select events of interest and prevent false alarms from wasting the available memory storage resources. The FORTE wideband receiver tunes from 20 to 320 MHz with eight sub-band trigger channels distributed across the 20 MHz IF bandwidth. The conditions which must be satisfied to generate an event trigger are processor controlled. Early testing of the prototype indicates an ability to reliably trigger on chirped RF signals several dB below the noise level. FORTE is scheduled to be launched with a Pegasus XL vehicle in late 1995.

Enemark, D.C.; Shipley, M.E.

1994-08-01T23:59:59.000Z

206

Complex vibrational correlation functions extracted from the resolved band of liquid acetonitrilem  

E-Print Network (OSTI)

that we choose (or construct) an appropriate theoretical model for the shapes of the constituent bands (often referred to as line shapes) that is based upon two factors. The Ðrst comprises the existing acetonitrile. A new approach for extracting all possible band shape details of highly overlapping spectral

Nerukh, Dmitry

207

Eurospeech 2001 -Scandinavia Sub-Band Based Additive Noise Removal for Robust Speech  

E-Print Network (OSTI)

Eurospeech 2001 - Scandinavia Sub-Band Based Additive Noise Removal for Robust Speech Recognition J analysis, etc. We will then introduce a sub-band based scheme to remove the noise effect from corrupted speech to make recognition system immune to additive noise. We will report on experiments on TI digits

208

Distributed Compressive Wide-Band Spectrum Ying Wang , Ashish Pandharipande , Yvan Lamelas Polo and Geert Leus  

E-Print Network (OSTI)

-band spectrum sensing, Cognitive radio, Spectrum estimation. I. INTRODUCTION Efficient utilization of radio and services and the dearth of available spectrum for licensed allocation [13]. Recent spectrum measurements have shown that large portions of licensed spectrum, notably in the VHF-UHF bands licensed

Leus, Geert

209

7/3/2013 17/3/2013 1 Control Banding  

E-Print Network (OSTI)

.e. explosion or chemical release) In the 1980s the pharmaceutical industry attempted to stratify hazards(5):330346. #12;7/3/2013 77/3/2013 7 History of Control Banding In 1996 the pharmaceutical industry expanded #12;7/3/2013 87/3/2013 8 Control Banding Models PHARMACEUTICAL INDUSTRY MODEL SMALL BUSINESS MODEL

Farritor, Shane

210

InAlAs EPITAXIAL GROWTH FOR WIDE BAND GAP SOLAR CELLS Marina S. Leite  

E-Print Network (OSTI)

InAlAs EPITAXIAL GROWTH FOR WIDE BAND GAP SOLAR CELLS Marina S. Leite 1 , Robyn L. Woo 2 , William vapor phase epitaxy and wide band gap solar cell fabrication. X-ray diffraction and transmissionAlAs solar cells lattice-matched to InP were grown and electrically characterized under AM 1.5 global 1-sun

Atwater, Harry

211

Band-engineered SrTiO{sub 3} nanowires for visible light photocatalysis  

SciTech Connect

We have theoretically investigated the structural, electronic, and optical properties of perovskite SrTiO{sub 3} nanowires for use in visible light photocatalytic applications using pseudopotential density-functional theory calculations. The electronic structure calculations show that the band gap is modified in the SrTiO{sub 3} nanowires compared with that of the bulk. For TiO{sub 2}-terminated nanowires, the mid-band states induced by the combination of oxygen and strontium atoms on the surface lead to a shift in the valence band toward the conduction band without interference from the edge of the conduction band, which reduces the band gap. On the contrary, the electronic states induced by the combination of oxygen and strontium atoms on the surface of SrO-terminated nanowires lead to a shift in the conduction band toward the valence band. The calculated optical results indicate that the absorption edge of the nanowires shift towards the red-light region. These theoretical results suggest that perovskite SrTiO{sub 3} nanowires are promising candidates for use in visible light photocatalytic processes such as solar-assisted water splitting reactions.

Fu, Q.; He, T.; Li, J. L.; Yang, G. W. [State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, Nanotechnology Research Center, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong (China)

2012-11-15T23:59:59.000Z

212

A Theory-Based Hydrometeor Identification Algorithm for X-Band Polarimetric Radars  

E-Print Network (OSTI)

A Theory-Based Hydrometeor Identification Algorithm for X-Band Polarimetric Radars BRENDA DOLAN, and comparisons are made with similar S-band hydrometeor identification algorithms applied to data from the S for illustrating bulk hydrometeor types and qualitatively agrees with analysis from KOUN. A simple reflectivity

Rutledge, Steven

213

Band structure engineering through orbital interaction for enhanced thermoelectric power factor  

E-Print Network (OSTI)

interaction on band structure is demonstrated for IV-VI thermoelectric semiconductors. For IV-VI materials, we thermoelectric performance has been demonstrated in the premier thermoelectric material, lead telluride (PbBand structure engineering through orbital interaction for enhanced thermoelectric power factor

Ceder, Gerbrand

214

Calibration of Indoor UWB Sub-band Divided Ray Tracing Using Multiobjective Simulated Annealing  

E-Print Network (OSTI)

, Sweden; 5 ICTEAM, Universit´e catholique de Louvain, Belgium Abstract--Sub-band divided ray tracing (RT) has been widely used to reproduce as reliably as possible the ultra-wideband (UWB) radio wave the accuracy of sub-band divided RT in terms of the power delay profile (PDP) and the root mean square (RMS

Zemen, Thomas

215

Light trapping design for low band-gap polymer solar cells  

E-Print Network (OSTI)

Light trapping design for low band-gap polymer solar cells Stephen Foster1,* and Sajeev John1,2 1 demonstrate numerically a 2-D nanostructured design for light trapping in a low band-gap polymer solar cell, "Light harvesting improvement of organic solar cells with self- enhanced active layer designs," Opt

John, Sajeev

216

A Dual-Band Antenna for WLAN Applications by Double Rectangular Patch with 4-Bridges  

E-Print Network (OSTI)

A Dual-Band Antenna for WLAN Applications by Double Rectangular Patch with 4-Bridges Chang won Jung, Irvine, Irvine, CA, 92697, USA Abstract: Double rectangular patch with 4-bridges is investigated for solution of IEEE 802.11b/g (2.4GHz) and 802.11a (5.5GHz). Rectangular patch for 5.5GHz frequency band

De Flaviis, Franco

217

Iodine stabilization of a diode laser in the optical communication band  

E-Print Network (OSTI)

Iodine stabilization of a diode laser in the optical communication band Hsiang-Chen Chui and Sen September 23, 2004 The iodine molecule has frequently been used as a frequency reference from the green provides a simple, compact, and high-performance frequency reference in the optical communication band

Shy,Jow-Tsong

218

A New Gap-Opening Mechanism in a Triple-Band Metal  

NLE Websites -- All DOE Office Websites (Extended Search)

A New Gap-Opening Mechanism in a A New Gap-Opening Mechanism in a Triple-Band Metal A New Gap-Opening Mechanism in a Triple-Band Metal Print Wednesday, 23 February 2005 00:00 A "wire" of indium only one or a few atoms wide grown on a silicon surface comprises an ideal test laboratory for studying one-dimensional (1D) metals. A new example comes from a collaboration between researchers from Yonsei University in Korea, the ALS, and the University of Oregon, who have discovered that the phase transition from metal to insulator that occurs at low temperature in indium wires on the silicon (111) surface involves not only the expected shift in the electronic structure (band-gap opening) but also a band restructuring that gives rise to an energy gap in a second band. Three's a Crowd

219

Valence- and conduction-band structure of the sapphire (1102) surface  

Science Journals Connector (OSTI)

X-ray photoelectron (XPS) and electron-energy-loss spectroscopies have been employed to investigate the valence- and conduction-band densities of states of the sapphire (1102) surface. The photoemission spectrum of the valence-band region has been adjusted to remove cross-section effects and compared to the recent theoretical density of states calculated by Ciraci and Batra. The energy-loss data have been used to determine the bulk-plasmon energy of sapphire, 24.00.3 eV, as well as the locations of eight regions of high conduction-bandstate density within 20 eV above the conduction-band minimum. One of these regions is an empty surface state 4.0 eV below the conduction-band minimum. Several high-binding-energy satellites in the XPS core-level spectra are reported and interpreted in terms of energy losses to plasmons and interband transitions.

W. J. Gignac; R. Stanley Williams; Steven P. Kowalczyk

1985-07-15T23:59:59.000Z

220

Dilute Group III-V nitride intermediate band solar cells with contact blocking layers  

DOE Patents (OSTI)

An intermediate band solar cell (IBSC) is provided including a p-n junction based on dilute III-V nitride materials and a pair of contact blocking layers positioned on opposite surfaces of the p-n junction for electrically isolating the intermediate band of the p-n junction by blocking the charge transport in the intermediate band without affecting the electron and hole collection efficiency of the p-n junction, thereby increasing open circuit voltage (V.sub.OC) of the IBSC and increasing the photocurrent by utilizing the intermediate band to absorb photons with energy below the band gap of the absorber layers of the IBSC. Hence, the overall power conversion efficiency of a IBSC will be much higher than an conventional single junction solar cell. The p-n junction absorber layers of the IBSC may further have compositionally graded nitrogen concentrations to provide an electric field for more efficient charge collection.

Walukiewicz, Wladyslaw (Kensington, CA); Yu, Kin Man (Lafayette, CA)

2012-07-31T23:59:59.000Z

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

The Intermediate-band Dropout Method: A New Method to Search for High-Redshift Galaxies  

E-Print Network (OSTI)

We propose a new method to search for high-redshift galaxies that is based on an intermediate-band dropout technique rather than the usual broad-band dropout one. In this method, we use an intermediate-band filter whose central wavelength is longer than 7000 \\AA. This new method makes it possible to distinguish both very late-type stars such as L and T dwarfs and dusty galaxies at intermediate redshift from real high-$z$ Lyman break galaxies. The reason for this is that such interlopers do not show strong intermediate-band depression although they have very red broad-band colors that are indicative of Lyman break galaxies. Applying our new method to imaging data sets obtained with the Suprime-Cam on the Subaru Telescope, we find a new sample of Lyman break galaxies at $z \\simeq 5$.

Shioya, Y; Ajiki, M; Nagao, T; Murayama, T; Sasaki, S; Sumiya, R; Hatakeyama, Y; Shioya, Yasuhiro; Taniguchi, Yoshiaki; Ajiki, Masaru; Nagao, Tohru; Murayama, Takashi; Sasaki, Shunji; Sumiya, Ryoko; Hatakeyama, Yuichiro

2005-01-01T23:59:59.000Z

222

Ternary silicon germanium nitrides: A class of tunable band gap materials  

Science Journals Connector (OSTI)

Ternary silicon germanium nitrides with compositions of both Si1?xGexN and (Si1?xGex)3N4 are predicted to have a band gap that decreases as the germanium:silicon ratio increases. The band gap is indirect for the silicon-rich compounds but becomes direct as the germanium content increases, due to greater mixing of s and p states in the conduction band. This effect of band gap tunability has recently been reported for (Si1?xGex)3N4 in the spinel structure [Boyko et al., Phys. Rev. B 81, 155207 (2010)]. Our results suggest that this is a more general effect and that ternary group-14 nitrides should form a class of semiconducting materials for which the band gap can be tuned by controlling the composition.

Judy N. Hart; Neil L. Allan; Frederik Claeyssens

2011-12-27T23:59:59.000Z

223

Defect-Band Emission Photoluminescence Imaging on Multi-Crystalline Si Solar Cells: Preprint  

SciTech Connect

Defect-band photoluminescence (PL) imaging with an InGaAs camera was applied to multicrystalline silicon (mc-Si) wafers, which were taken from different heights of different Si bricks. Neighboring wafers were picked at six different processing steps, from as-cut to post-metallization. By using different cut-off filters, we were able to separate the band-to-band emission images from the defect-band emission images. On the defect-band emission images, the bright regions that originate from the grain boundaries and defect clusters were extracted from the PL images. The area fraction percentage of these regions at various processing stages shows a correlation with the final cell electrical parameters.

Yan, F.; Johnston, S.; Zaunbrecher, K.; Al-Jassim, M.; Sidelkheir, O.; Blosse, A.

2011-07-01T23:59:59.000Z

224

A New Gap-Opening Mechanism in a Triple-Band Metal  

NLE Websites -- All DOE Office Websites (Extended Search)

A New Gap-Opening Mechanism in a Triple-Band Metal Print A New Gap-Opening Mechanism in a Triple-Band Metal Print A "wire" of indium only one or a few atoms wide grown on a silicon surface comprises an ideal test laboratory for studying one-dimensional (1D) metals. A new example comes from a collaboration between researchers from Yonsei University in Korea, the ALS, and the University of Oregon, who have discovered that the phase transition from metal to insulator that occurs at low temperature in indium wires on the silicon (111) surface involves not only the expected shift in the electronic structure (band-gap opening) but also a band restructuring that gives rise to an energy gap in a second band. Three's a Crowd For the condensed-matter physicist, the words "electronic structure" are what it's all about. Short-hand for a description of the way electrons behave in solids, liquids, molecules, and even atoms, electronic structure underlies almost all of the everyday properties of matter from structural strength to electrical conductivity. For example, metals conduct electricity because some of their electrons have access to a continuous band of energies, whereas a break or gap in the band turns the metal into an insulator.

225

A New Gap-Opening Mechanism in a Triple-Band Metal  

NLE Websites -- All DOE Office Websites (Extended Search)

A New Gap-Opening Mechanism in a Triple-Band Metal Print A New Gap-Opening Mechanism in a Triple-Band Metal Print A "wire" of indium only one or a few atoms wide grown on a silicon surface comprises an ideal test laboratory for studying one-dimensional (1D) metals. A new example comes from a collaboration between researchers from Yonsei University in Korea, the ALS, and the University of Oregon, who have discovered that the phase transition from metal to insulator that occurs at low temperature in indium wires on the silicon (111) surface involves not only the expected shift in the electronic structure (band-gap opening) but also a band restructuring that gives rise to an energy gap in a second band. Three's a Crowd For the condensed-matter physicist, the words "electronic structure" are what it's all about. Short-hand for a description of the way electrons behave in solids, liquids, molecules, and even atoms, electronic structure underlies almost all of the everyday properties of matter from structural strength to electrical conductivity. For example, metals conduct electricity because some of their electrons have access to a continuous band of energies, whereas a break or gap in the band turns the metal into an insulator.

226

The Band Spectra of SbF and BiF  

Science Journals Connector (OSTI)

New band spectra attributed to the molecules SbF and BiF have been excited by active nitrogen. The spectrum of SbF from 2000-5500A is found to have three groups of bands lying in the regions 3600-5200A, 2600-2700A and 2200-2430A. Analysis of the first group shows that sixty-one bands out of sixty-nine can be placed into two systems with the following vibrational constants, in cm-1: System?e?e?xe??e??e??xe???e??A121887.5411.31.71616.92.89A223992.5420.01.75612.62.58 The second group consists of a few isolated bands degraded to shorter wave-lengths and the third of bands in closely spaced sequences and also degraded to shorter wave-lengths. A preliminary analysis indicates that the bands in the latter group can be placed into two systems for which ?e??700 cm-1, ?e???620 cm-1 and ??21?1850 cm-1. Three new systems of bands, degraded to shorter wave-lengths and forming a triplet system with wide multiplet separations, (7330 cm-1 and 4800 cm-1), are found in the spectrum of BiF at 3050-3250A, 2650-2850A and 2250-2350A. Photographs taken with small dispersion indicate that ?e??620 cm-1 and ?e???520 cm-1.

George D. Rochester

1937-03-15T23:59:59.000Z

227

Electronic- and band-structure evolution in low-doped (Ga,Mn)As  

SciTech Connect

Modulation photoreflectance spectroscopy and Raman spectroscopy have been applied to study the electronic- and band-structure evolution in (Ga,Mn)As epitaxial layers with increasing Mn doping in the range of low Mn content, up to 1.2%. Structural and magnetic properties of the layers were characterized with high-resolution X-ray diffractometry and SQUID magnetometery, respectively. The revealed results of decrease in the band-gap-transition energy with increasing Mn content in very low-doped (Ga,Mn)As layers with n-type conductivity are interpreted as a result of merging the Mn-related impurity band with the host GaAs valence band. On the other hand, an increase in the band-gap-transition energy with increasing Mn content in (Ga,Mn)As layers with higher Mn content and p-type conductivity indicates the Moss-Burstein shift of the absorption edge due to the Fermi level location within the valence band, determined by the free-hole concentration. The experimental results are consistent with the valence-band origin of mobile holes mediating ferromagnetic ordering in the (Ga,Mn)As diluted ferromagnetic semiconductor.

Yastrubchak, O.; Gluba, L.; ?uk, J. [Institute of Physics, UMCS, Pl. Marii Curie-Sk?odowskiej 1, 20-031 Lublin (Poland)] [Institute of Physics, UMCS, Pl. Marii Curie-Sk?odowskiej 1, 20-031 Lublin (Poland); Sadowski, J. [Institute of Physics, Polish Academy of Sciences, 02-668 Warszawa (Poland) [Institute of Physics, Polish Academy of Sciences, 02-668 Warszawa (Poland); MAX-Lab, Lund University, 22100 Lund (Sweden); Krzy?anowska, H. [Institute of Physics, UMCS, Pl. Marii Curie-Sk?odowskiej 1, 20-031 Lublin (Poland) [Institute of Physics, UMCS, Pl. Marii Curie-Sk?odowskiej 1, 20-031 Lublin (Poland); Department of Physics and Astronomy, Vanderbilt University, 6506 Stevenson Center, Nashville, Tennessee 37325 (United States); Domagala, J. Z.; Andrearczyk, T.; Wosinski, T. [Institute of Physics, Polish Academy of Sciences, 02-668 Warszawa (Poland)] [Institute of Physics, Polish Academy of Sciences, 02-668 Warszawa (Poland)

2013-08-07T23:59:59.000Z

228

A New Gap-Opening Mechanism in a Triple-Band Metal  

NLE Websites -- All DOE Office Websites (Extended Search)

A New Gap-Opening Mechanism in a Triple-Band Metal Print A New Gap-Opening Mechanism in a Triple-Band Metal Print A "wire" of indium only one or a few atoms wide grown on a silicon surface comprises an ideal test laboratory for studying one-dimensional (1D) metals. A new example comes from a collaboration between researchers from Yonsei University in Korea, the ALS, and the University of Oregon, who have discovered that the phase transition from metal to insulator that occurs at low temperature in indium wires on the silicon (111) surface involves not only the expected shift in the electronic structure (band-gap opening) but also a band restructuring that gives rise to an energy gap in a second band. Three's a Crowd For the condensed-matter physicist, the words "electronic structure" are what it's all about. Short-hand for a description of the way electrons behave in solids, liquids, molecules, and even atoms, electronic structure underlies almost all of the everyday properties of matter from structural strength to electrical conductivity. For example, metals conduct electricity because some of their electrons have access to a continuous band of energies, whereas a break or gap in the band turns the metal into an insulator.

229

Band gap tuning and optical absorption in type-II InAs/GaSb mid infrared short period superlattices: 14 bands K Dot-Operator p study  

SciTech Connect

The MBE growth of short-period InAs/GaSb type-II superlattice structures, varied around 20.5 A InAs/24 A GaSb were [J. Applied physics, 96, 2580 (2004)] carried out by Haugan et al. These SLs were designed to produce devices with an optimum mid-infrared photoresponse and a sharpest photoresponse cutoff. We have used a realistic and reliable 14-band k.p formalism description of the superlattice electronic band structure to calculate the absorption coefficient in such short-period InAs/GaSb type-II superlattices. The parameters for this formalism are known from fitting to independent experiments for the bulk materials. The band-gap energies are obtained without any fitting parameters, and are in good agreement with experimental data.

AbuEl-Rub, Khaled M. [Department of Applied Physical Sciences, Jordan University of Science and Technology Irbid, 21141 (Jordan)

2012-09-06T23:59:59.000Z

230

Atmospheric glow discharges from the high-frequency to very high-frequency bands  

Science Journals Connector (OSTI)

This letter reports an experimental investigation of an atmospheric glow discharge in both the high-frequency (HF) band of 330 MHz and the very high frequency band of 30300 MHz. At constant input power increased frequency is found to change little the electron density and to reduce slightly the electron excitation temperature. Significantly an eightfold frequency increase from 20 to 80 MHz leads to a 20-fold increase in the maximum plasma power without plasma constriction. The maximum power density of 355 ? W / cm 3 achieved at 80 MHz is far greater than those reported in the HF band.

J. L. Walsh; F. Iza; M. G. Kong

2008-01-01T23:59:59.000Z

231

Atmospheric glow discharges from the high-frequency to very high-frequency bands  

SciTech Connect

This letter reports an experimental investigation of an atmospheric glow discharge in both the high-frequency (HF) band of 3-30 MHz and the very high frequency band of 30-300 MHz. At constant input power, increased frequency is found to change little the electron density and to reduce slightly the electron excitation temperature. Significantly, an eightfold frequency increase from 20 to 80 MHz leads to a 20-fold increase in the maximum plasma power without plasma constriction. The maximum power density of 355 W/cm{sup 3} achieved at 80 MHz is far greater than those reported in the HF band.

Walsh, J. L.; Iza, F.; Kong, M. G. [Department of Electronic and Electrical Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU (United Kingdom)

2008-12-22T23:59:59.000Z

232

Band structure properties of (BGa)P semiconductors for lattice matched integration on (001) silicon  

SciTech Connect

We report the band structure properties of (BGa)P layers grown on silicon substrate using metal-organic vapour-phase epitaxy. Using surface photo-voltage spectroscopy we find that both the direct and indirect band gaps of (BGa)P alloys (strained and unstrained) decrease with Boron content. Our experimental results suggest that the band gap of (BGa)P layers up to 6% Boron is large and suitable to be used as cladding and contact layers in GaP-based quantum well heterostructures on silicon substrates.

Hossain, Nadir; Sweeney, Stephen [Advanced Technology Institute and Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH (United Kingdom); Hosea, Jeff [Advanced Technology Institute and Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, UK and Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, Johor Bahru 81310 (Malaysia); Liebich, Sven; Zimprich, Martin; Volz, Kerstin; Stolz, Wolfgang [Material Sciences Center and Faculty of Physics, Philipps-University, 35032 Marburg (Germany); Kunert, Bernerdette [NAsP III/V GmbH, Am Knechtacker 19, 35041 Marburg (Germany)

2013-12-04T23:59:59.000Z

233

Pathogenic Interactions Between Sorghum Yellow Banding Virus and Other Viruses Infecting Sorghum.  

E-Print Network (OSTI)

Between Sorghum Yellow Banding Virus and Other Viruses Infecting Sorghum M.P.K.J. Theu and R. W. Toler1 Abstract A pathogenic interaction between sorghum yel low banding virus (SYBV) and maize dwarf mosaic (MDMV-A) virus was proved. Inoculation... Microscope Operation. 6th ed. North-Holland., Amsterdam. 326 pp. 3 2. McClelen, C.E., and R.W. Toler. 1989. The ultra structural aspects of infection of Zea mays c.v. Silver Queen by sorghum yellow banding virus (SYBV). (ABSTR.) Phytopathology 79...

Theu, M.P.K.J; Toler, R.W.

1992-01-01T23:59:59.000Z

234

Emergence of rotational bands in ab initio no-core configuration interaction calculations  

E-Print Network (OSTI)

Rotational bands have been observed to emerge in ab initio no-core configuration interaction (NCCI) calculations for p-shell nuclei, as evidenced by rotational patterns for excitation energies, electromagnetic moments, and electromagnetic transitions. We investigate the ab initio emergence of nuclear rotation in the Be isotopes, focusing on 9Be for illustration, and make use of basis extrapolation methods to obtain ab initio predictions of rotational band parameters for comparison with experiment. We find robust signatures for rotational motion, which reproduce both qualitative and quantitative features of the experimentally observed bands.

M. A. Caprio; P. Maris; J. P. Vary; R. Smith

2015-02-04T23:59:59.000Z

235

Coherent states model for three interacting bands of positive parity in the rotational limit and its extension to negative parity bands  

Science Journals Connector (OSTI)

The coherent state model (CSM) which was previously proposed to describe the ground, beta, and gamma bands of even-even nuclei, is considered for the special case of large deformations. Asymptotic expressions for the excitation energies and the B(E2) values are analitically written. The final formulas for energies are first tested on 232Th and then applied to several even-mass isotopes of U and Hf. Branching ratios are calculated for 232Th, where relevant data exist. The CSM is extended so that two excited octupole bands are included. The numerical study shows very good agreement with the experimental data.

A.A R?duta; C ?abac

1983-01-01T23:59:59.000Z

236

Band Offsets at the Epitaxial Anatase TiO2/n-SrTiO3(001) Interface...  

NLE Websites -- All DOE Office Websites (Extended Search)

to measure valence band offsets at the epitaxial anatase TiO2(002)n-SrTiO3(001) heterojunction prepared by molecular beam epitaxy, Within experimental error, the valance band...

237

ARM - Evaluation Product - Active Remote Sensing of Clouds from Ka-band ARM  

NLE Websites -- All DOE Office Websites (Extended Search)

ProductsActive Remote Sensing of Clouds from Ka-band ProductsActive Remote Sensing of Clouds from Ka-band ARM Zenith Radars Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : Active Remote Sensing of Clouds from Ka-band ARM Zenith Radars Site(s) GAN SGP General Description The Ka-band ARM Zenith Radars (KAZRs) have replaced the long-serving Millimeter Cloud Radars, or MMCRs. Accordingly, the primary MMCR Value Added Product (VAP), the Active Remote Sensing of CLouds (ARSCL) product, is being replaced by a KAZR-based version, the KAZR-ARSCL VAP. KAZR-ARSCL provides cloud boundaries and best-estimate time-height fields of radar moments. KAZR observations are corrected for water vapor attenuation and velocity aliasing and significant detection masks are produced. KAZR-ARSCL

238

Criterion for purely elastic Taylor-Couette instability in the flows of shear-banding fluids  

E-Print Network (OSTI)

In the past twenty years, shear-banding flows have been probed by various techniques, such as rheometry, velocimetry and flow birefringence. In micellar solutions, many of the data collected exhibit unexplained spatio-temporal ...

Fardin, M. A.

239

Formation of bands and ridges on Europa by cyclic deformation: Insights from analogue wax experiments  

E-Print Network (OSTI)

, California, USA Antoine Sinton Departement des Sciences de la Matiere, Ecole Normale Superieure, Lyon, France); KEYWORDS: Europa, ridges, tidal deformation Citation: Manga, M., and A. Sinton (2004), Formation of bands

Manga, Michael

240

E-Print Network 3.0 - angstrom extinction band Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

extinction band Page: << < 1 2 3 4 5 > >> 1 GoMACCS Planning Meeting, 19 April 2006 NASA King Air B200 Deployment Plans for Summary: measurements Color ratio (or Angstrom...

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Identification of a quasiparticle band in very neutron-rich {sup 104}Zr  

SciTech Connect

The high spin levels of a very neutron-rich {sup 104}Zr nucleus have been reinvestigated by measuring the prompt {gamma} rays in the spontaneous fission of {sup 252}Cf. The ground-state band has been confirmed. A new sideband has been identified with a band-head energy at 1928.7 keV. The projected shell model is employed to investigate the band structure of {sup 104}Zr. The results of calculated levels are in good agreement with the experimental data, and suggest that the new band in {sup 104}Zr may be based on the neutron {nu}5/2{sup -}[532] x {nu}3/2{sup +}[411] configuration.

Yeoh, E. Y.; Wang, J. G.; Ding, H. B.; Gu, L.; Xu, Q.; Xiao, Z. G. [Department of Physics, Tsinghua University, Beijing 100084 (China); Zhu, S. J. [Department of Physics, Tsinghua University, Beijing 100084 (China); Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States); Hamilton, J. H.; Ramayya, A. V.; Hwang, J. K.; Liu, S. H. [Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States); Liu, Y. X. [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); School of Science, Huzhou Teachers College, Huzhou 313000 (China); Sun, Y. [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 (China); Luo, Y. X. [Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States); Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Rasmussen, J. O.; Lee, I. Y. [Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

2010-08-15T23:59:59.000Z

242

On the K{sup {pi}} = 0{sup +} rotational bands in the {sup 178}Hf nucleus  

SciTech Connect

The results obtained by studying the angular distributions of gamma rays with respect to the neutron-beam axis in the reaction {sup 178}Hf(n, n'{gamma}) involving the deexcitation of the K{sup {pi}} = 0{sup +} rotational bands of {sup 178}Hf are presented.New information about themultipole-mixing parameter {delta} in gamma transitions from the levels of these bands is obtained. The K{sup {pi}} = 0{sub 4}{sup +} band is constructed anew. The relationship between the parameter {delta} for the (2{sup +}0{sub n}-2{sup +}0{sub 1}) gamma transition and the energy gap {Delta}{sub n} = E{sub lev}(2{sup +}0{sub n}) - E{sub lev}(0{sup +}0{sub n}), on one hand, and the quasiparticle structure of the rotational band, on the other hand, is discussed for {sup 178}Hf on the basis of the quasiparticle-phonon model.

Govor, L. I.; Demidov, A. M.; Kurkin, V. A., E-mail: kurkin@polyn.kiae.su; Mikhailov, I. V. [Russian Research Centre Kurchatov Institute (Russian Federation)

2010-07-15T23:59:59.000Z

243

Intrinsic electron and hole bands in electron-doped cuprate superconductors  

SciTech Connect

We propose that the upper Hubbard band (electron-like) and the Zhang-Rice singlet band (holelike) are two essential components in describing low-energy excitations of electron-doped cuprate superconductors. We find that the gap between these two bands is significantly smaller than the charge-transfer gap measured by optics and is further reduced upon doping. This indicates that the charge fluctuation is strong and the system is in the intermediate correlation regime. A two-band model is derived. In the limit that the intraband and interband hopping integrals are equal to each other, this model is equivalent to the unconstrained t-J model with on-site Coulomb repulsions.

Xiang, T.

2010-02-24T23:59:59.000Z

244

GaNAsP: An intermediate band semiconductor grown by gas-source molecular beam epitaxy  

SciTech Connect

Dilute nitride GaNAsP thin films were grown via a GaAsP metamorphic buffer on GaP(100) substrate with gas-source molecular beam epitaxy. The compositions of this III-V-V-V compound were determined by channeling Rutherford backscattering spectroscopy and nuclear reaction analysis. Photoreflectance shows two distinctive transitions from the valence band to the split conduction bands due to N incorporation. Photoluminescence and optical absorption show the fundamental bandgap of Ga(N)AsP is largely tailored by the small amount of N. The observed multiband characteristics and the bandgap tunability of GaNAsP are two merits that fit into the intermediate-band solar cell roadmap, and GaNAsP of high crystal quality provides a strong candidate for intermediate band solar cell materials.

Kuang, Y. J. [Department of Physics, University of California, San Diego, La Jolla, California 92093 (United States)] [Department of Physics, University of California, San Diego, La Jolla, California 92093 (United States); Yu, K. M.; Walukiewicz, W. [Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)] [Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Kudrawiec, R. [Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States) [Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Institute of Physics, Wroclaw University of Technology, Wybrzeze, Wyspianskiego 27, 50-370 Wroclaw (Poland); Luce, A. V. [Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States) [Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Department of Materials Science and Engineering, University of California, Berkeley, California 94720 (United States); Ting, M. [Department of Mechanical Engineering, University of California, Berkeley, California 94720 (United States)] [Department of Mechanical Engineering, University of California, Berkeley, California 94720 (United States); Tu, C. W. [Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, California 92093 (United States)] [Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, California 92093 (United States)

2013-03-18T23:59:59.000Z

245

Raman excitation profile of the G band in single-chirality carbon nanotubes  

E-Print Network (OSTI)

We present in this work measurements of the Raman excitation profile of the high-energy phonons (G band) in single-chirality (n,m) semiconducting single-wall carbon nanotubes using more than 70 laser excitation energies, ...

Moura, L. G.

246

G? band in double- and triple-walled carbon nanotubes: A Raman study  

E-Print Network (OSTI)

Double- and triple-walled carbon nanotubes are studied in detail by laser energy-dependent Raman spectroscopy in order to get a deeper understanding about the second-order G[superscript '] band Raman process, general ...

Hirschmann, Thomas Ch.

247

Bloch band and Bloch waves of superfluid Fermi gases in optical lattices  

Science Journals Connector (OSTI)

Bloch band and stabilities of Bloch waves of superfluid Fermi gases in one-dimensional (1D) periodic optical lattices are discussed. Within the hydrodynamical theory and the two-mode approximation, the Bloch band structure, the energetic and dynamical instabilities of Bloch waves at the first Brilliouin zone are presented. The results show that, when the atom density is beyond a critical value, a loop structure in the Bloch band at the zone edge is developed along the BEC-BCS crossover. The Bloch band structure and the stabilities of Bloch waves are modified dramatically when the system crosses from the BEC side to the BCS side, and they can be adjusted to the required characteristics by changing the atoms interaction (with the Feshbach resonance technique), the atom density, and the lattice parameters. The analytical expressions of the critical atom density for exciting the loop structure and maintaining the stabilities of Bloch waves are obtained.

Wei Qi and Ju-Kui Xue

2010-01-12T23:59:59.000Z

248

Evolution of Mesoscale Precipitation Band Environments within the Comma Head of Northeast U.S. Cyclones  

Science Journals Connector (OSTI)

This paper explores the mesoscale forcing and stability evolution of intense precipitation bands in the comma head sector of extratropical cyclones using the 32-km North American Regional Reanalysis, hourly 20-km Rapid Update Cycle analyses, and ...

David R. Novak; Brian A. Colle; Anantha R. Aiyyer

2010-06-01T23:59:59.000Z

249

Improved color coordinates of green monochromatic pc-LED capped with a band-pass filter  

Science Journals Connector (OSTI)

This study introduces a greener green monochromatic phosphor-converted light-emitting diode (pc-LED) using a band-pass filter (BPF) combined with a long-pass dichroic...

Oh, Ji Hye; Yang, Su Ji; Sung, Yeon-Goog; Do, Young Rag

2013-01-01T23:59:59.000Z

250

Spin-rotor Interpretation of Identical Bands and Quantized Alignment in Superdeformed A $\\approx$ 190 Nuclei  

E-Print Network (OSTI)

The ``identical'' bands in superdeformed mercury, thallium, and lead nuclei are interpreted as examples of orbital angular momentum rotors with the weak spin-orbit coupling of pseudo-$SU(3)$ symmetries and supersymmetries.

J. A. Cizewski; R. Bijker

1995-06-02T23:59:59.000Z

251

Zone folding effect in Raman G-band intensity of twisted bilayer graphene  

E-Print Network (OSTI)

The G-band Raman intensity is calculated for twisted bilayer graphene as a function of laser excitation energy based on the extended tight binding method. Here we explicitly consider the electron-photon and electron-phonon ...

Dresselhaus, Mildred

252

InAs/GaAs Quantum-Dot Intermediate-Band Solar Cells  

Science Journals Connector (OSTI)

Results for quantum-dot intermediate-band solar cells are presented. It is shown that quantum dots in conventional p-i-n structures can extend the photoresponse to 1300 nm, well...

Grenko, Alysha; Kimukin, Ibrahim; Walker, John; Towe, Elias

253

Discussion on Ohta et al., "Traveling bands in self-propelled soft particles"  

E-Print Network (OSTI)

A discussion on the contribution of Ohta and Yamanaka in this special issue, supplemented by new agent-based simulations of band collisions within the standard Vicsek-model.

Thomas Ihle; Yen-Liang Chou

2014-03-26T23:59:59.000Z

254

Assembly and Function of the RNA Editing Complex in Trypanosoma brucei Requires Band III Protein  

Science Journals Connector (OSTI)

...However, even after several sequential column purifications, contaminant proteins can still be present (11, 29), and surreptitious protein associations could occur within the most purified fractions. To provide additional lines of evidence that band...

Catherine E. Huang; Sean F. O'Hearn; Barbara Sollner-Webb

2002-05-01T23:59:59.000Z

255

An Analysis of Depolarization of Circular Polarization in S-Band Radar Sensing of Alberta Storms  

Science Journals Connector (OSTI)

An analysis is given of storm events in 198285 in which the Alberta Research Council circularly polarized polarization diversity S-band radar recorded data indicating significant depolarization. The accompanying two-way differential propagation ...

Anthony R. Holt

2001-09-01T23:59:59.000Z

256

Triple photonic band-gap structure dynamically induced in the presence of spontaneously generated coherence  

SciTech Connect

We study a cold atomic sample coherently driven into the five-level triple-{Lambda} configuration for attaining a dynamically controlled triple photonic band-gap structure. Our numerical calculations show that three photonic band gaps with homogeneous reflectivities up to 92% can be induced on demand around the probe resonance by a standing-wave driving field in the presence of spontaneously generated coherence. All these photonic band gaps are severely malformed with probe reflectivities declining rapidly to very low values when spontaneously generated coherence is gradually weakened. The triple photonic band-gap structure can also be attained in a five-level chain-{Lambda} system of cold atoms in the absence of spontaneously generated coherence, which however requires two additional traveling-wave fields to couple relevant levels.

Gao Jinwei; Bao Qianqian; Wan Rengang; Cui Cuili; Wu Jinhui [College of Physics, Jilin University, Changchun 130012 (China)

2011-05-15T23:59:59.000Z

257

The BMRC/NCAR C-Band Polarimetric (C-POL) Radar System  

Science Journals Connector (OSTI)

The development of the first Australian C-band polarimetric/Doppler meteorological radar system (C-POL) is described. Motivated by the need to obtain improved rainfall estimation and the vertical profile of hydrometeors, C-POL was developed ...

T. Keenan; K. Glasson; F. Cummings; T. S. Bird; J. Keeler; J. Lutz

1998-08-01T23:59:59.000Z

258

Failure in shear bands for granular materials: thermo-hydro-chemo-mechanical effects  

E-Print Network (OSTI)

Failure in shear bands for granular materials: thermo-hydro-chemo- mechanical effects M. VEVEAKIS depends on the chemical reaction characteristics and that micro-inertia due to grain translations

Paris-Sud XI, Université de

259

Femtosecond-scale x-ray FEL diagnostics with an X-band transverse...  

NLE Websites -- All DOE Office Websites (Extended Search)

Femtosecond-scale x-ray FEL diagnostics with an X-band transverse deflector Wednesday, October 22, 2014 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Speaker: Tim Maxwell,...

260

E-Print Network 3.0 - airborne l-band radar Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Ecology 4 DELANEY AND WARD Radar Development at Lincoln Laboratory: An Overview of the First Fifty Years Summary: in a full-scale environment. The UHFL-band TRADEX radar shown in...

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

www.calband.berkeley.edu Photo by Laura Mack THE OFFICIAL NEWSLETTER OF THE UNIVERSITY OF CALIFORNIA MARCHING BAND  

E-Print Network (OSTI)

Midway at the 32nd Naval Base. In addition to playing a Battle of the Bands with the Texas Longhorn Band their hearts out while the bands battled it out. Holiday Bowl 2011 Catherine Azzopardi, tenor '09 The Holiday battled the Longhorns once again at a luncheon at the San Diego Convention Center, and continued

Walker, Matthew P.

262

Photoelectrochemical Study of the Band Structure of Zn2SnO4 Prepared by the Hydrothermal Method  

Science Journals Connector (OSTI)

In this paper, we study the band gap (Eg) and energetics of the conduction band (CB) and valence band (VB) for films of zinc stannate (Zn2SnO4) nanoparticles (ca. 25 nm) of the inverse-spinel structure prepared by the hydrothermal method. ...

Mario A. Alpuche-Aviles; Yiying Wu

2009-02-16T23:59:59.000Z

263

{gamma}-Spectroscopy of Positive Parity Bands In The {sup 156}Gd Nucleus  

SciTech Connect

During an experiment at Jyvaeskylae laboratory involving a 27 MeV {alpha} beam on a thick {sup 154}Sm target, {gamma}-spectroscopy of {sup 156}Gd was performed using JUROGAM HPGe multidetector array. We will present here experimental results concerning positive parity bands of this nucleus. Level scheme was enriched with more than ten new transitions as well as a new level in a band observed recently.

Vancraeyenest, A.; Guinet, D.; Stezowski, O.; Doan, Q. T.; Redon, N. [Universite de Lyon, Universite Lyon 1, CNRS/IN2P3, Institut de Physique Nucleaire de Lyon, Villeurbanne (France); Curien, D.; Dudek, J. [IPHC-DRS, ULP, IN2P3-CNRS, 67037 Strasbourg (France); Greenlees, P. T.; Jones, P. [Department of Physics, University of Jyvaeskylae, 40014 Jyvaeskylae (Finland)

2011-10-28T23:59:59.000Z

264

Solar DEM Models : A solar image in color band b, mn pixels,  

E-Print Network (OSTI)

Solar DEM Models : A solar image in color band b, m?n pixels, containing a particular solar feature, for t = 1, 2, . . . , T. btM sianFieldRandomGaus I M I I bbb T t bbtt bbb bb 2 1 2 )( #12;Solar DEM.bI : the measure error of the ith row and jth column pixel of the certain image in color band b. ijbe #12;Solar DEM

Wolfe, Patrick J.

265

The J-band of organic dyes: lineshape and coherence lengthq Alexander Eisfeld, John S. Briggs*  

E-Print Network (OSTI)

, opto-electronics, solar cells, photobiology and as supra-molecular fibres. Recently there has been muchThe J-band of organic dyes: lineshape and coherence lengthq Alexander Eisfeld, John S. Briggs of the exciton band are Wkj i ¼ 1 ffiffiffiffi N p X n expðikn? pnj i; ð1? where jpni is a product of monomer

Eisfeld, Alexander

266

Performance characteristics of a perforated shadow band under clear sky conditions  

SciTech Connect

A perforated, non-rotating shadow band is described for separating global solar irradiance into its diffuse and direct normal components using a single pyranometer. Whereas shadow bands are normally solid so as to occult the sensor of a pyranometer throughout the day, the proposed band has apertures cut from its circumference to intermittently expose the instrument sensor at preset intervals. Under clear sky conditions the device produces a saw tooth waveform of irradiance data from which it is possible to reconstruct separate global and diffuse curves. The direct normal irradiance may then be calculated giving a complete breakdown of the irradiance curves without need of a second instrument or rotating shadow band. This paper describes the principle of operation of the band and gives a mathematical model of its shading mask based on the results of an optical ray tracing study. An algorithm for processing the data from the perforated band system is described and evaluated. In an extended trial conducted at NREL's Solar Radiation Research Laboratory, the band coupled with a thermally corrected Eppley PSP produced independent curves for diffuse, global and direct normal irradiance with low mean bias errors of 5.6 W/m{sup 2}, 0.3 W/m{sup 2} and -2.6 W/m{sup 2} respectively, relative to collocated reference instruments. Random uncertainties were 9.7 W/m{sup 2} (diffuse), 17.3 W/m{sup 2} (global) and 19.0 W/m{sup 2} (direct). When the data processing algorithm was modified to include the ray trace model of sensor exposure, uncertainties increased only marginally, confirming the effectiveness of the model. Deployment of the perforated band system can potentially increase the accuracy of data from ground stations in predominantly sunny areas where instrumentation is limited to a single pyranometer. (author)

Brooks, Michael J. [School of Mechanical Engineering, University of KwaZulu-Natal, Durban (South Africa)

2010-12-15T23:59:59.000Z

267

Separation of 23 Cynodon turf-type cultivars using electrophoretic banding patterns  

E-Print Network (OSTI)

s was developed. Four different starch gel recipes were used in order to reveal the banding patterns of six isoenzymes. Based on qualitative differences in the banding patterns of six 1soenzymes, the 23 cultivars investigated in this study could be separated... . Gel Construction and Electrophoresis. Protein Extraction. Electrophoresis Gel Staining. Acrylamide Gel Electrophoresis Assessment RESULTS AND DISCUSSION Aconi tase . Alcohol Dehydrogenase Phosphoglucomutase. Phospho Glucoseisomerase. Shikimic...

Vermeulen, Paul Henri

1988-01-01T23:59:59.000Z

268

Stimulated dual-band infrared computed tomography: A tool to inspect the aging infrastructure  

SciTech Connect

The authors have developed stimulated dual-band infrared (IR) computed tomography as a tool to inspect the aging infrastructure. The system has the potential to locate and quantify structural damage within airframes and bridge decks. Typically, dual-band IR detection methods improve the signal-to-noise ratio by a factor of ten, compared to single-band IR detection methods. They conducted a demonstration at Boeing using a uniform pulsed-heat source to stimulate IR images of hidden defects in the 727 fuselage. The dual-band IR camera and image processing system produced temperature, thermal inertia, and cooling-rate maps. In combination, these maps characterized the defect site, size, depth, thickness and type. The authors quantified the percent metal loss from corrosion above a threshold of 5%, with overall uncertainties of 3%. Also, they conducted a feasibility study of dual-band IR thermal imaging for bridge deck inspections. They determined the sites and relative concrete displacement of 2-in. and 4-in. deep delaminations from thin styrofoam implants in asphalt-covered concrete slabs. They demonstrated the value of dual-band IR computed tomography to quantify structural damage within flash-heated airframes and naturally-heated bridge decks.

Del Grande, N.K.; Durbin, P.F.

1995-06-27T23:59:59.000Z

269

The Isotope Effect in Band Spectra, IV: the Spectrum of Silicon Nitride  

Science Journals Connector (OSTI)

Silicon nitride bands.(1) A system of bands shaded toward the red, lying between 3800 and 5300A was obtained by Jevons in 1913 by the introduction of SiCl4 vapor into active nitrogen. His measurements have been repeated and extended to all possible heads. It is important that no oxygen be present. From a sharp intense head each band decreases rapidly in intensity to zero at the null line, then increases to a maximum at about m=13 in the negative branch, in which the lines get far enough apart to be resolved. With the aid of the quantum theory, Jevons' arrangement was revised, and correct initial (n?) and final (n??) vibrational quantum numbers assigned. The null lines of the Si28N bands correspond to the wave-number equation: ??=24234.2+1016.30n?-17.77n?2+0.410n?4-0.00487n?-1145.00n??+6.570n??2. Partial analysis of the band structure indicates that the lines of any band are given by the equation: ?=??+B?+2B?m+Cm2 where B?=0.728-0.097n? and C=-0.0121-0.0097n?+0.0053n??; from this the internuclear distance for the vibrationless SiN molecule is 1.5610-8 cm. Additional weak heads are present whose positions agree very closely with those calculated for the isotopes Si29N and Si30N, isotope 29 being slightly the stronger. This agreement definitely excludes SiO or any other compound than SiN as the emitter of the bands, confirming the chemical evidence. The agreement is also definite, but not conclusive, evidence against the existence of half-quantum numbers for SiN, a result opposite to that for BO. Plate I shows most of the Si28N bands together with some isotope heads. The intensity distribution in each band corresponds to thermal equilibrium at about 80C. In respect to the initial vibrational quantum number, the distribution is non-thermal and corresponds to a high effective temperature as in other cases such as BO and CN. The intensity distribution with respect to ?n is similar to that of the violet CN bands. The sequence ?n=0 is by far the strongest, other sequences of diminishing intensity being observed as far as -3 and +3 or +4. (2) New system of bands, extensive but weak, probably also due to SiN, is described. They all have double heads (??=27), are shaded toward the red and extend from the ultraviolet through the green. An equation for the heads is given. The intensity distribution is characterized by numerically large values of ?n and by the absence of the band (0?0) and some neighboring bands.

Robert S. Mulliken

1925-09-01T23:59:59.000Z

270

An Intermediate-band imaging survey for high-redshift Lyman Alpha Emitters: The Mahoroba-11  

E-Print Network (OSTI)

We present results of our intermediate-band optical imaging survey for high-$z$ Ly$\\alpha$ emitters (LAEs) using the prime focus camera, Suprime-Cam, on the 8.2m Subaru Telescope. In our survey, we use eleven filters; four broad-band filters ($B$, $R_{\\rm c}$, $i^\\prime$, and $z^\\prime$) and seven intermediate-band filters covering from 500 nm to 720 nm; we call this imaging program as the Mahoroba-11. The seven intermediate-band filters are selected from the IA filter series that is the Suprime-Cam intermediate-band filter system whose spectral resolution is $R = 23$. Our survey has been made in a $34^\\prime \\times 27^\\prime$ sky area in the Subaru XMM Newton Deep Survey field. We have found 409 IA-excess objects that provide us a large photometric sample of strong emission-line objects. Applying the photometric redshift method to this sample, we obtained a new sample of 198 LAE candidates at $3 42.67$ between $z \\sim 3$ and 5.

Yamada, S F; Sumiya, R; Umeda, K; Shioya, Y; Ajiki, M; Nagao, T; Murayama, T; Taniguchi, Y; Yamada, Sanae F.; Sasaki, Shunji S.; Sumiya, Ryoko; Umeda, Kazuyoshi; Shioya, Yasuhiro; Ajiki, Masaru; Nagao, Tohru; Murayama, Takashi; Taniguchi, Yoshiaki

2005-01-01T23:59:59.000Z

271

Band gaps in InN/GaN superlattices: Nonpolar and polar growth directions  

SciTech Connect

The electronic structures of nonpolar short-period InN/GaN superlattices (SLs) grown in the wurtzite a- and m-directions have been calculated and compared to previous calculations for polar superlattices (grown in the c-direction). The variation of the band gaps with the composition (m, n) of the mInN/nGaN unit cells of the superlattices was examined. The band structures were obtained by self-consistent calculations based on the local density approximation to the density functional theory using the Linear-Muffin-Tin-Orbital method with a semi-empirical correction for the band gaps. The calculated band gaps and their pressure coefficients for nonpolar superlattices are similar to those calculated for bulk InGaN alloys with an equivalent In/Ga concentration ratio. This is very different from what has been found in polar superlattices where the band gaps are much smaller and vanish when the number m of InN layers in the unit cell exceeds three. A strong internal electric field is responsible for this behavior of polar structures. Experimental photoluminescence data for polar SLs agree very well with gaps calculated for the nonpolar structures. It is suggested that this is caused by screening of the electric field in the polar structures by carriers originating from unintentional defects.

Gorczyca, I., E-mail: iza@unipress.waw.pl; Skrobas, K.; Suski, T. [Institute of High Pressure Physics, UNIPRESS, 01-142 Warsaw (Poland); Christensen, N. E.; Svane, A. [Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark)

2013-12-14T23:59:59.000Z

272

Composition dependent valence band order in c-oriented wurtzite AlGaN layers  

SciTech Connect

The valence band order of polar wurtzite aluminum gallium nitride (AlGaN) layers is analyzed for a dense series of samples, grown heteroepitaxially on sapphire substrates, covering the complete composition range. The excitonic transition energies, found by temperature dependent photoluminescence (PL) spectroscopy, were corrected to the unstrained state using input from X-ray diffraction. k?p theory yields a critical relative aluminum concentration x{sub c}=(0.090.05) for the crossing of the uppermost two valence bands for strain free material, shifting to higher values for compressively strained samples, as supported by polarization dependent PL. The analysis of the strain dependent valence band crossing reconciles the findings of other research groups, where sample strain was neglected. We found a bowing for the energy band gap to the valence band with ?{sub 9} symmetry of b{sub ?{sub 9}}=0.85eV, and propose a possible bowing for the crystal field energy of b{sub cf}=?0.12eV. A comparison of the light extraction efficiency perpendicular and parallel to the c axis of Al{sub x}Ga{sub 1-x}N/Al{sub y}Ga{sub 1-y}N quantum well structures is discussed for different compositions.

Neuschl, B., E-mail: benjamin.neuschl@uni-ulm.de; Helbing, J.; Knab, M.; Lauer, H.; Madel, M.; Thonke, K. [Institute of Quantum Matter / Semiconductor Physics Group, University of Ulm, Albert-Einstein-Allee 45, 89069 Ulm (Germany); Meisch, T.; Forghani, K.; Scholz, F. [Institute of Optoelectronics, University of Ulm, Albert-Einstein-Allee 45, 89069 Ulm (Germany); Feneberg, M. [Institut fr Experimentelle Physik, Otto-von-Guericke-Universitt Magdeburg, Universittsplatz 2, 39106 Magdeburg (Germany)

2014-09-21T23:59:59.000Z

273

Comparison of Direct and Indirect Measures of Critical Bands of the Monaural Chinchilla  

Science Journals Connector (OSTI)

Typically it is found that lower forms (rats cats and chinchillas) require a greater S/N ratio than does man in order to detect the presence of a pure?tone signal in a broad?band noise. Assuming Fletcher's formula to be an adequate means of estimating the operating bandwidth of the auditory system one could come to the conclusion that these lower forms have larger critical ratios larger critical bands and therefore poorer frequency resolving ability than does man. However the behavioral index of auditory sensitivity utilized in these experiments does not permit separation of behavioral criterion and auditory sensitivity. It seems probable that lower forms are trained to maintain a high criterion (low false?alarm rate) and thereby produce threshold measures of relatively high S/N ratio. Our efforts have been directed toward measuring both critical ratios and critical bands (band narrowing paradigm) utilizing both traditional threshold measures and criterion free indices of signal detection theory. Data obtained at signal frequencies of 500 Hz 1 2 and 4 kHz will be discussed in terms of (1) the relationship of critical ratios to critical bands as a function of frequency and (2) the effect of criterion contamination on the estimate of the critical ratio and therefore on the estimate of the frequency resolving power of the organism.

W. H. Seaton; C. Trahiotis

1973-01-01T23:59:59.000Z

274

ARM - Midlatitude Continental Convective Clouds Experiment (MC3E): Multi-Frequency Profilers, S-band Radar (williams-s_band)  

DOE Data Explorer (OSTI)

This data was collected by the NOAA 449-MHz and 2.8-GHz profilers in support of the Department of Energy (DOE) and NASA sponsored Mid-latitude Continental Convective Cloud Experiment (MC3E). The profiling radars were deployed in Northern Oklahoma at the DOE Atmospheric Radiation Mission (ARM) Southern Great Plans (SGP) Central Facility from 22 April through 6 June 2011. NOAA deployed three instruments: a Parsivel disdrometer, a 2.8-GHz profiler, and a 449-MHz profiler. The parasivel provided surface estimates of the raindrop size distribution and is the reference used to absolutely calibrate the 2.8 GHz profiler. The 2.8-GHz profiler provided unattenuated reflectivity profiles of the precipitation. The 449-MHz profiler provided estimates of the vertical air motion during precipitation from near the surface to just below the freezing level. By using the combination of 2.8-GHz and 449-MHz profiler observations, vertical profiles of raindrop size distributions can be retrieved. The profilers are often reference by their frequency band: the 2.8-GHz profiler operates in the S-band and the 449-MHz profiler operates in the UHF band. The raw observations are available as well as calibrated spectra and moments. This document describes how the instruments were deployed, how the data was collected, and the format of the archived data.

Christopher Williams

275

ARM - Midlatitude Continental Convective Clouds Experiment (MC3E): Multi-Frequency Profilers, S-band Radar (williams-s_band)  

SciTech Connect

This data was collected by the NOAA 449-MHz and 2.8-GHz profilers in support of the Department of Energy (DOE) and NASA sponsored Mid-latitude Continental Convective Cloud Experiment (MC3E). The profiling radars were deployed in Northern Oklahoma at the DOE Atmospheric Radiation Mission (ARM) Southern Great Plans (SGP) Central Facility from 22 April through 6 June 2011. NOAA deployed three instruments: a Parsivel disdrometer, a 2.8-GHz profiler, and a 449-MHz profiler. The parasivel provided surface estimates of the raindrop size distribution and is the reference used to absolutely calibrate the 2.8 GHz profiler. The 2.8-GHz profiler provided unattenuated reflectivity profiles of the precipitation. The 449-MHz profiler provided estimates of the vertical air motion during precipitation from near the surface to just below the freezing level. By using the combination of 2.8-GHz and 449-MHz profiler observations, vertical profiles of raindrop size distributions can be retrieved. The profilers are often reference by their frequency band: the 2.8-GHz profiler operates in the S-band and the 449-MHz profiler operates in the UHF band. The raw observations are available as well as calibrated spectra and moments. This document describes how the instruments were deployed, how the data was collected, and the format of the archived data.

Williams, Christopher

2012-11-06T23:59:59.000Z

276

Oblique Aerial & Ground Visible Band & Thermographic Imaging | Open Energy  

Open Energy Info (EERE)

Oblique Aerial & Ground Visible Band & Thermographic Imaging Oblique Aerial & Ground Visible Band & Thermographic Imaging Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Oblique Aerial & Ground Visible Band & Thermographic Imaging Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Remote Sensing Techniques Exploration Sub Group: Passive Sensors Parent Exploration Technique: Passive Sensors Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Thermal: Cost Information Low-End Estimate (USD): 400.0040,000 centUSD 0.4 kUSD 4.0e-4 MUSD 4.0e-7 TUSD / Subject Median Estimate (USD): 450.0045,000 centUSD 0.45 kUSD 4.5e-4 MUSD 4.5e-7 TUSD / Subject High-End Estimate (USD): 6,000.00600,000 centUSD

277

ARM - Publications: Science Team Meeting Documents: W-Band ARM Cloud Radar  

NLE Websites -- All DOE Office Websites (Extended Search)

W-Band ARM Cloud Radar System W-Band ARM Cloud Radar System Mead, James ProSensing Inc. Widener, Kevin Pacific Northwest National Laboratory The W-Band ARM Cloud Radar (WACR) is a dual polarization 95 GHz radar that will be deployed at the SGP CART site in the spring of 2005. The WACR system will be installed in the existing MMCR shelter, and will provide continuous zenith pointing measurements of clouds to compliment measurements provided by MMCR. Built by ProSensing Inc. of Amherst, MA, the WACR system include a high peak power (1.5 kW) EIKA transmitter, low noise receiver, and PC-based digital receiver. In addition to an internal calibration procedure, an electronically controlled deflector plate mounted on the roof of the MMCR shelter will be used to periodically illuminate a

278

Photoelectron spectroscopic study of band alignment of polymer/ZnO photovoltaic device structure  

SciTech Connect

Using x-ray photoelectron spectroscopy, we investigated the band alignment of a Ag/poly(3-hexylthiophene-2,5-diyl) (P3HT)/ZnO photovoltaic structure. At the P3HT/ZnO interface, a band bending of P3HT and a short surface depletion layer of ZnO were observed. The offset between the highest occupied molecular orbital of P3HT and the conduction band minimum of ZnO at the interface contributed to the open circuit voltage (Voc) was estimated to be approximately 1.5 {+-} 0.1 eV, which was bigger than that of the electrically measured effective Voc of P3HT/ZnO photovoltaic devices, meaning that the P3HT/ZnO photovoltaic structure has the potential to provide improved photovoltaic properties.

Nagata, T.; Chikyow, T. [International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan)] [International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan); Oh, S.; Wakayama, Y. [International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan) [International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan); Department of Chemistry and Biochemistry, Faculty of Engineering, Kyushu University, 1-1 Namiki, Tsukuba 305-0044 (Japan); Yamashita, Y. [International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan) [International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan); NIMS Beamline Station at SPring-8, National Institute for Materials Science, 1-1-1 Koto, Sayo-cho, Sayo-gun, Hyogo 679-5148 (Japan); Yoshikawa, H.; Kobayashi, K. [NIMS Beamline Station at SPring-8, National Institute for Materials Science, 1-1-1 Koto, Sayo-cho, Sayo-gun, Hyogo 679-5148 (Japan)] [NIMS Beamline Station at SPring-8, National Institute for Materials Science, 1-1-1 Koto, Sayo-cho, Sayo-gun, Hyogo 679-5148 (Japan); Ikeno, N. [International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan) [International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan); Nanotechnology Laboratory, Meiji University, 1-1-1 Higashimita, Tama-ku, Kawasaki, Kanagawa 214-8571 (Japan)

2013-01-28T23:59:59.000Z

279

Band gap and electronic structure of MgSiN{sub 2}  

SciTech Connect

Density functional theory calculations and electron energy loss spectroscopy indicate that the electronic structure of ordered orthorhombic MgSiN{sub 2} is similar to that of wurtzite AlN. A band gap of 5.7?eV was calculated for both MgSiN{sub 2} (indirect) and AlN (direct) using the Heyd-Scuseria-Ernzerhof approximation. Correction with respect to the experimental room-temperature band gap of AlN indicates that the true band gap of MgSiN{sub 2} is 6.2?eV. MgSiN{sub 2} has an additional direct gap of 6.3?eV at the ? point.

Quirk, J. B., E-mail: james.quirk09@imperial.ac.uk; Rsander, M.; McGilvery, C. M.; Moram, M. A. [Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ (United Kingdom); Palgrave, R. [Department of Chemistry, University College London, Gordon Street WC1H 0AJ (United Kingdom)

2014-09-15T23:59:59.000Z

280

Predicted band structures of III-V semiconductors in the wurtzite phase  

SciTech Connect

While non-nitride III-V semiconductors typically have a zinc-blende structure, they may also form wurtzite crystals under pressure or when grown as nanowhiskers. This makes electronic structure calculation difficult since the band structures of wurtzite III-V semiconductors are poorly characterized. We have calculated the electronic band structure for nine III-V semiconductors in the wurtzite phase using transferable empirical pseudopotentials including spin-orbit coupling. We find that all the materials have direct gaps. Our results differ significantly from earlier ab initio calculations, and where experimental results are available (InP, InAs, and GaAs) our calculated band gaps are in good agreement. We tabulate energies, effective masses, and linear and cubic Dresselhaus zero-field spin-splitting coefficients for the zone-center states. The large zero-field spin-splitting coefficients we find may facilitate the development of spin-based devices.

De, A.; Pryor, Craig E. [Department of Physics and Astronomy and Optical Science and Technology Center, University of Iowa, Iowa City, Iowa 52242 (United States)

2010-04-15T23:59:59.000Z

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281

Intermediate-band material based on GaAs quantum rings for solar cells  

SciTech Connect

The intermediate-band concept is invoked to explain the photoresponse spectra obtained for unbiased devices fabricated from GaAs quantum rings grown by a droplet epitaxy technique on lattice-matched Al{sub 0.3}Ga{sub 0.7}As barriers. The photoresponse spectra where measured at room temperature in the visible-near-infrared spectral range. The presence of the intermediate band in the device active region is confirmed by measuring the mid-infrared photoresponse, which is attributed to the intersubband transitions in the conduction band. The photocurrent was measured at room temperature and found to be about four orders of magnitude larger than the dark current in the voltage range of {+-} 4.0 V.

Wu Jiang; Shao Dali [Department of Electrical Engineering, University of Arkansas, Fayetteville, Arkansas 72701 (United States); Li Zhenhua; Kunets, Vasyl P.; Wang Zhiming; Salamo, G. J. [Institute of Nanoscale Materials Science and Engineering, Fayetteville, Arkansas 72701 (United States); Manasreh, M. O. [Department of Electrical Engineering, University of Arkansas, Fayetteville, Arkansas 72701 (United States); Institute of Nanoscale Materials Science and Engineering, Fayetteville, Arkansas 72701 (United States)

2009-08-17T23:59:59.000Z

282

Generation and recombination rates at ZnTe:O intermediate band states  

SciTech Connect

Carrier generation and recombination processes of ZnTeO thin films are studied by time-resolved photoluminescence, where carrier lifetimes at oxygen states and the conduction band are inferred to be >1??s and <100?ps, respectively. The radiative recombination coefficient for optical transitions from oxygen states to the valence band is extracted to be 1.210{sup ?10}?cm{sup 3}?sec{sup ?1} based on the excitation dependence of decay time constants. Rate equation analysis further suggests an increase in electron lifetime at the conduction band as oxygen states occupation is critical in achieving high conversion efficiency for solar cells based on multiphoton processes in these materials.

Wang, Weiming; Lin, Albert S.; Phillips, Jamie D.; Metzger, Wyatt K.

2009-01-01T23:59:59.000Z

283

Strain-induced band-gap engineering of graphene monoxide and its effect on graphene  

Science Journals Connector (OSTI)

Using first-principles calculations we demonstrate the feasibility of band-gap engineering in two-dimensional crystalline graphene monoxide (GMO), a recently reported graphene-based material with a 1:1 carbon/oxygen ratio. The band gap of GMO, which can be switched between direct and indirect, is tunable over a large range (01.35 eV) for accessible strains. Electron and hole transport occurs predominantly along the zigzag and armchair directions (armchair for both) when GMO is a direct- (indirect-) gap semiconductor. A band gap of ?0.5 eV is also induced in graphene at the K? points for GMO/graphene hybrid systems.

H. H. Pu; S. H. Rhim; C. J. Hirschmugl; M. Gajdardziska-Josifovska; M. Weinert; J. H. Chen

2013-02-13T23:59:59.000Z

284

Band offsets in HfO{sub 2}/InGaZnO{sub 4} heterojunctions  

SciTech Connect

The valence band discontinuity ({Delta}E{sub V}) of sputter deposited HfO{sub 2}/InZnGaO{sub 4} (IGZO) heterostructures was obtained from x-ray photoelectron spectroscopy measurements. The HfO{sub 2} exhibited a bandgap of 6.07 eV from absorption measurements. A value of {Delta}E{sub V} = 0.48 {+-} 0.025 eV was obtained by using the Ga 2p{sub 3/2}, Zn 2p{sub 3/2}, and In 3d{sub 5/2} energy levels as references. This implies a conduction band offset {Delta}E{sub C} of 2.39 eV in HfO{sub 2}/InGaZnO{sub 4} heterostructures and a nested interface band alignment.

Cho, Hyun [Department of Nanomechatronics Engineering, Pusan National University, Gyeongnam 627-706 (Korea, Republic of); Douglas, E. A.; Gila, B. P.; Craciun, V.; Lambers, E. S.; Pearton, S. J. [Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611 (United States); Ren Fan [Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611 (United States)

2012-01-02T23:59:59.000Z

285

Phenomenology and physical origin of shear-localization and shear-banding in complex fluids  

E-Print Network (OSTI)

We review and compare the phenomenological aspects and physical origin of shear-localization and shear-banding in various material types, namely emulsions, suspensions, colloids, granular materials and micellar systems. It appears that shear-banding, which must be distinguished from the simple effect of coexisting static-flowing regions in yield stress fluids, occurs in the form of a progressive evolution of the local viscosity towards two significantly different values in two adjoining regions of the fluids in which the stress takes slightly different values. This suggests that from a global point of view shear-banding in these systems has a common physical origin: two physical phenomena (for example, in colloids, destructuration due to flow and restructuration due to aging) are in competition and, depending on the flow conditions, one of them becomes dominant and makes the system evolve in a specific direction.

Guillaume Ovarlez; Stphane Rodts; Xavier Chateau; Philippe Coussot

2010-02-09T23:59:59.000Z

286

MI-TRIBE-LAC VIEUX DESERT BAND OF LAKE SUPERIOR CHIPPEWA  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

MI-TRIBE-LAC VIEUX DESERT BAND OF LAKE SUPERIOR CHIPPEWA MI-TRIBE-LAC VIEUX DESERT BAND OF LAKE SUPERIOR CHIPPEWA INDIANS Location: Tribe MI-TRIBE-LAC VIEUX DESERT BAND OF LAKE SUPERIOR CHIPPEWA INDIANS MI American Recovery and Reinvestment Act: Proposed Action or Project Description The Lac Vieux Desert Tribe proposes to use funding to help with a current effort that is a collaboration of the Tribe with the Conservation Fund of Michigan, an effort that is funded by the W.K. Kellogg Foundation. The project will be conducting a feasibility study to determine the viability of using wood products from resources found on tribal lands. The study is dedicating a part of the effort to see the feasibility of providing a renewable energy source to the Tribe in the form of wood products and biomass fuels. NEPA

287

Measurements of CsI band-gap closure to 93 GPa  

Science Journals Connector (OSTI)

Infrared-absorption measurements to a peak pressure of 93 GPa document the pressure-induced closure of the band gap of CsI to about 4450 cm-1 (0.55 eV). In accord with previous spectroscopic measurements to 60 GPa, our data show that the band gap of CsI decreases continuously with pressure, and metallization (complete closure of the gap) is expected to occur above 100 GPa. A recent claim that CsI becomes metallic at 655 GPa is therefore spurious.

Quentin Williams and Raymond Jeanloz

1986-01-13T23:59:59.000Z

288

Development of an L-Band RF Electron Gun for SASE in the Infrared Region  

SciTech Connect

We conduct research on Self-Amplified Spontaneous Emission (SASE) in the infrared region using the 40 MeV, 1.3 GHz L-band linac of Osaka University. The linac equipped with a thermionic electron gun can accelerate a high-intensity single-bunch beam though its normalized emittance is high. In order to advance the research on SASE, we have begun development of an RF gun for the L-band linac in collaboration with KEK. We will report conceptual design of the RF gun and present the status of development of another RF gun for STF at KEK.

Kashiwagi, Shigeru; Kato, Ryukou; Isoyama, Goro [Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047 (Japan); Hayano, Hitoshi; Urakawa, Junji [Accelerator Laboratory, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801 (Japan)

2010-02-03T23:59:59.000Z

289

A Minimal Two-band Model for the Superconducting Fe-pnictides  

SciTech Connect

Following the discovery of the Fe-pnictide superconductors, LDA band structure calculations showed that the dominant contributions to the spectral weight near the Fermi energy came from the Fe 3d orbitals. The Fermi surface is characterized by two hole surfaces around the {Lambda} point and two electron surfaces around the M point of the 2 Fe/cell Brillouin zone. Here, we describe a 2-band model that reproduces the topology of the LDA Fermi surface and exhibits both ferromagnetic and q = ({pi}, 0) spin density wave (SDW) fluctuations. We argue that this minimal model contains the essential low energy physics of these materials.

Raghu, S.

2010-03-25T23:59:59.000Z

290

Electronic Structure of Small Titanium Clusters: Emergence and Evolution of the 3d Band  

Science Journals Connector (OSTI)

The electronic structure of titanium clusters (Tin, n=365) is probed by size-selected anion photoelectron spectroscopy. It is observed that the 3d band emerges at the eight-atom cluster beyond which the d band broadens and evolves toward that of the bulk. The electronic structure of the titanium clusters is found to become bulklike at relatively small cluster sizes. This is discussed in terms of the delocalization of the titanium 3d orbitals and the implications for the cluster structures.

Hongbin Wu; Sunil R. Desai; Lai-Sheng Wang

1996-01-08T23:59:59.000Z

291

Description of the identical superdeformed bands and ?I=4 bifurcation in the A?130 region  

Science Journals Connector (OSTI)

Within the supersymmetry scheme including many-body interactions, identical superdeformed (SD) bands and ?I=4 bifurcation in A?130 mass region are investigated systematically. Quantitatively good results for the ?-ray energy (E?) spectra, dynamical moments of inertia, and energy differences ?E?-?E?ref are obtained. This shows that the supersymmetry approach is quite powerful in describing not only generic rotational properties, but also ?I=4 bifurcation and identical SD bands simultaneously. Meanwhile, the ?I=4 bifurcation may come from the perturbation with SO(5) [or SU(5)] symmetry on the rotational symmetry.

Yu-xin Liu, Jia-jun Wang, and Qi-zhi Han

2001-11-21T23:59:59.000Z

292

Realizing novel accelerator concepts in an X-band photo-injector  

SciTech Connect

In this project we propose to investigate the use of novel accelerator structure cell geometry to enhance the performance of X-band photo-injectors. Making novel accelerator concepts possible involves fabrication and testing of components to ensure that the performance predicted by simulation is robustly achievable. This work is important because photo-injectors are increasingly used to provide high brightness electron beams for light sources, pushing their performance to the limits, but also requiring them to be user-facility stable. Careful investigation in both computer simulation and design, and low power testing of piece parts will enable the successful fabrication of an advanced X-band photo-injector.

Marsh, R

2010-04-13T23:59:59.000Z

293

Scanning tunneling microscopy on unpinned GaN(1100) surfaces: Invisibility of valence-band states  

Science Journals Connector (OSTI)

We investigated the origins of the tunnel current in scanning tunneling microscopy (STM) and spectroscopy experiments on GaN(1100) surfaces. By calculating the tunnel currents in the presence of a tip-induced band bending for unpinned n-type GaN(1100) surfaces, we demonstrate that only conduction-band states are observed at positive and negative voltage polarities independent of the doping concentration. Valence-band states remain undetectable because tunneling out of the electron-accumulation zone in conduction-band states dominates by four orders of magnitude. As a result band-gap sizes cannot be determined by STM on unpinned GaN(1100) surfaces. Appropriate band-edge positions and gap sizes can be determined on pinned surfaces.

Ph. Ebert, L. Ivanova, and H. Eisele

2009-08-24T23:59:59.000Z

294

Assessing Transportation Disadvantage and Public Transportation Opportunites in Rural Ontario: A Case Study of Huron County .  

E-Print Network (OSTI)

??In virtually all rural areas in Ontario the limited transportation alternatives means that rural residents without access to a personal vehicle are at great risk (more)

Marr, Eric

2012-01-01T23:59:59.000Z

295

Price of Port Huron, MI Liquefied Natural Gas Exports to Canada...  

Annual Energy Outlook 2012 (EIA)

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2013 9.48 2014 10.66 10.66 9.74 10.09 9.74 9.85 9.85 9.85 10.86...

296

Taking the Band Function Too Far: A Tale of Two $\\alpha$'s  

E-Print Network (OSTI)

The long standing problem of identifying the emission mechanism operating in gamma-ray bursts (GRBs) has produced a myriad of possible models that have the potential of explaining the observations. Generally, the empirical Band function is fit to the observed gamma-ray data and the fit parameters are used to infer which radiative mechanisms are at work in GRB outflows. In particular, the distribution of the Band function's low-energy power law index, $\\alpha$, has led to the so-called synchrotron "line-of-death" (LOD) which is a statement that the distribution cannot be explained by the simplest of synchrotron models alone. As an alternatively fitting model, a combination of a blackbody in addition to the Band function is used, which in many cases provide a better or equally good fit. It has been suggested that such fits would be able to alleviate the LOD problem for synchrotron emission in GRBs. However, these conclusions rely on the Band function's ability to fit a synchrotron spectrum within the observed e...

Burgess, J Michael; Yu, Hoi-Fung

2014-01-01T23:59:59.000Z

297

Attention-modulated Alpha-band Oscillations Protect against Intrusion of Irrelevant Information  

E-Print Network (OSTI)

after a cue to attend to that hand, but shows in- creased power after a cue to attend to the foot alpha power. However, the alpha-band modulation was not simply locked to the cue offset. The tem- poral in the sequence, peri- stimulus alpha power predicted the degree to which that irrel- evant stimulus distorted

Sekuler, Robert

298

Non-LTE modeling of the near UV band of late-type stars  

E-Print Network (OSTI)

We investigate the ability of both LTE and Non-LTE models to fit the near UV band absolute flux distribution and individual spectral line profiles of three standard stars for which high quality spectrophotometry and high resolution spectroscopy are available: The Sun (G2 V), Arcturus (K2 III), and Procyon (F5 IV-V). We investigate 1) the effect of the choice of atomic line list on the ability of NLTE models to fit the near UV band flux level, 2) the amount of a hypothesized continuous thermal absorption extinction source required to allow NLTE models to fit the observations, and 3) the semi-empirical temperature structure required to fit the observations with NLTE models and standard continuous near UV extinction. We find that all models that are computed with high quality atomic line lists predict too much flux in the near UV band for Arcturus, but fit the warmer stars well. The variance among independent measurements of the solar irradiance in the near UV is sufficiently large that we cannot definitely conclude that models predict too much near UV flux, in contrast to other recent results. We surmise that the inadequacy of current atmospheric models of K giants in the near UV band is best addressed by hypothesizing that there is still missing continuous thermal extinction, and that the missing near UV extinction becomes more important with decreasing effective temperature for spectral classes later than early G, suggesting a molecular origin.

C. Ian Short; P. H. Hauschildt

2008-11-07T23:59:59.000Z

299

Scent marking within and between groups of wild banded N. R. Jordan1  

E-Print Network (OSTI)

Scent marking within and between groups of wild banded mongooses N. R. Jordan1 , F. Mwanguhya1; intrasexual competition; Mungos mungo. Correspondence Neil R. Jordan, The Vincent Wildlife Trust, 3 & 4 be involved in direct competition for mates (Jordan, Cherry & Manser, 2007). However, an intruding individual

Rüedi, Peter

300

Impurity bands and quasi-Bloch waves for a one-dimensional model of modulated crystal  

E-Print Network (OSTI)

from the theory of quasi-periodic functions while the second relies on periodicity properties, impurity band, quasi-Bloch wave, quantum chaos, spectral algorithm, deformed crystal, Charge-Density Wave coupled oscillators; consult the book [1] and the recent paper [14] to which we are about to borrow

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

G-Band Vapor Radiometer Precipitable Water Vapor (GVRPWV) Value-Added Product  

SciTech Connect

The G-Band Vapor Radiometer Precipitable Water Vapor (GVRPWV) value-added product (VAP) computes precipitable water vapor using neural network techniques from data measured by the GVR. The GVR reports time-series measurements of brightness temperatures for four channels located at 183.3 1, 3, 7, and 14 GHz.

Koontz, A; Cadeddu, M

2012-12-05T23:59:59.000Z

302

KuROS: A New Airborne Ku-Band Doppler Radar for Observation of Surfaces  

Science Journals Connector (OSTI)

This study presents the new airborne Doppler radar Ku-Band Radar for Observation of Surfaces (KuROS), which provides measurements of the normalized radar cross section ? and of the Doppler velocity over the sea. The system includes two antennas ...

Grard Caudal; Danile Hauser; Ren Valentin; Christophe Le Gac

2014-10-01T23:59:59.000Z

303

Extracting E Versus K Effective Band Structure from Supercell Calculations on Alloys and Impurities  

SciTech Connect

The supercell approach to defects and alloys has circumvented the limitations of those methods that insist on using artificially high symmetry, yet this step usually comes at the cost of abandoning the language of E versus k band dispersion. Here we describe a computational method that maps the energy eigenvalues obtained from large supercell calculations into an effective band structure (EBS) and recovers an approximate E(k) for alloys. Making use of supercells allows one to model a random alloy A{sub 1-x}B{sub x}C by occupying the sites A and B via a coin-toss procedure, affording many different local environments (polymorphic description) to occur. We present the formalism and implementation details of the method and apply it to study the evolution of the impurity band appearing in the dilute GaN:P alloy. We go beyond the perfectly random case, realizing that many alloys may have nonrandom microstructures, and investigate how their formation is reflected in the EBS. It turns out that the EBS is extremely sensitive in determining the critical disorder level for which delocalized states start to appear in the intermediate band. In addition, the EBS allows us to identify the role played by atomic relaxation in the positioning of the impurity levels.

Popescu, V.; Zunger, A.

2012-02-15T23:59:59.000Z

304

Narrow band defect luminescence from Al-doped ZnO probed by scanning tunneling cathodoluminescence  

E-Print Network (OSTI)

Institute of Physics. Related Articles Effect of CdS film thickness on the photoexcited carrier lifetime of TiO2/CdS core-shell nanowires Appl. Phys. Lett. 99, 153111 (2011) Current underestimationNarrow band defect luminescence from Al-doped ZnO probed by scanning tunneling cathodoluminescence

Russell, Kasey

305

Differential entropy in wavelet sub-band for assessment of glaucoma  

Science Journals Connector (OSTI)

Glaucoma is an eye disease that causes progressive optic neuropathy and vision loss due to degeneration of the optic nerves. Cup to disc ratio (CDR) is the standard measure for evaluation of glaucoma. It is difficult to estimate the value of CDR if the ... Keywords: cup to disc ratio, differential entropy, glaucoma, wavelet sub-band

Malaya Kumar Nath; Samarendra Dandapat

2012-09-01T23:59:59.000Z

306

Electronic band structure of isolated and bundled carbon nanotubes S. Reich and C. Thomsen  

E-Print Network (OSTI)

for nanotubes with larger diameters 1­1.5 nm a shift of the energy levels of 100 meV is obtained in our abElectronic band structure of isolated and bundled carbon nanotubes S. Reich and C. Thomsen Institut in chiral and achiral isolated nanotubes as well as in carbon nanotube bundles. The curvature

Nabben, Reinhard

307

Shear-band structure in ballistically tested carbide-free bainitic steels  

E-Print Network (OSTI)

Shear-band structure in ballistically tested carbide-free bainitic steels L. C. D. Fieldinga , H. K recently been commercialised, with the steel structure consisting of carbide-free, nanostructured bainitic of the carbide-free mixtures of bainitic ferrite and retained austenite. It is with this in mind that bainitic

Cambridge, University of

308

PHYSICAL NATURE OF SHEAR BANDS FORMATION AND CONSTITUTIVE MODELLING FOR PLASTIC INSTABILITY  

E-Print Network (OSTI)

697 PHYSICAL NATURE OF SHEAR BANDS FORMATION AND CONSTITUTIVE MODELLING FOR PLASTIC INSTABILITYtokrzyska 21,00-049 Warsaw,Poland Revue Phys. Appl. 23 (1988) 697 AVRIL 1988, Studies of plastic deformation dependent hardening property can be pivotal in the modelling for plastic deform- ation instability

Paris-Sud XI, Université de

309

LETTER Communicated by Donald Spencer Wide-Band Information Transmission at the Calyx of Held  

E-Print Network (OSTI)

LETTER Communicated by Donald Spencer Wide-Band Information Transmission at the Calyx of Held, University of Leicester, Leicester LE1 9HN, U.K. Bruce P. Graham b.graham@cs.stir.ac.uk Computing Science and Mathematics, University of Stirling, Stirling FK9 4LA, U.K. We use a mathematical model of the calyx of Held

Graham, Bruce

310

Effects of Dynamic Forcing on Hillslope Water Balance Models , L.E. Band  

E-Print Network (OSTI)

simulations of the hillslope. In this work we focus specifically on closure relations for hillslope water]. Briefly stated, our objective in this work is to study the effect of system transience on hillslope waterEffects of Dynamic Forcing on Hillslope Water Balance Models C. E. Kees , L.E. Band , and M

311

Solar DEM Model Proposal : A solar image in color band b, mn pixels,  

E-Print Network (OSTI)

Solar DEM Model Proposal : A solar image in color band b, m?n pixels, containing a particular solar 11 )( #12;Solar DEM Model Proposal : the volume (abundance?) of ion ii : the proportion of the total volume at temperature t t T t bitt I i ib MIE 11 )( #12;Solar Dataset · 15 Filters.txt files

Wolfe, Patrick J.

312

Atmosphere and Ionosphere of Venus from the Mariner V S-Band Radio Occultation Measurement  

Science Journals Connector (OSTI)

...georef;1968059704 atmosphere ionosphere Mariner 5...English United States 1968 Atmosphere and ionosphere of venus...com-parison (between 423.3 Mhz and S-band, for example...the superrefractive atmosphere, are fea-tures of...magnetopause, and plasma-pause due to the solar...

Arvydas Kliore; Gerald S. Levy; Dan L. Cain; Gunnar Fjeldbo; S. I. Rasool

1967-12-29T23:59:59.000Z

313

A narrow-band high-speed switched-capacitor sixth order bandpass ladder filter  

E-Print Network (OSTI)

In narrow-band high-speed switched-capacitor filters, the main limitation comes from the capacitance spread and from amplifier settling time. A secondary clock, that averages at an integer fraction of the main clock signal, is used to reduce...

Adut, Jozef

2012-06-07T23:59:59.000Z

314

Photodiode-driven quantum-well modulators for C-band wavelength conversion and broadcasting  

E-Print Network (OSTI)

Photodiode-driven quantum-well modulators for C-band wavelength conversion and broadcasting Hilmi-well modulators directly driven by monolithically-integrated photodiodes for polarization-integrated, surface-normal photodiodes (PD), as shown in Fig. 1(a) along with their corresponding circuit diagram

Miller, David A. B.

315

The effect of a multivalley energy band structure on the thermoelectric figure of merit  

E-Print Network (OSTI)

value of the thermoelectric figure of merit Z than a similar material which has only a single valleyL-49 The effect of a multivalley energy band structure on the thermoelectric figure of merit D. M A comparison is drawn between the dimensionless thermoelectric figure of merit of a multivalleyed semiconductor

Boyer, Edmond

316

OUTFLOWS AND DARK BANDS AT ARCADE-LIKE ACTIVE REGION CORE BOUNDARIES  

SciTech Connect

Observations from the EUV Imaging Spectrometer (EIS) on board Hinode have revealed outflows and non-thermal line broadening in low intensity regions at the edges of active regions (ARs). We use data from Hinode's EIS, Solar Dynamic Observatory's Atmospheric Imaging Assembly and Helioseismic and Magnetic Imager, and the Transition Region and Coronal Explorer instrument to investigate the boundaries of arcade-like AR cores for NOAA ARs 11112, 10978, and 9077. A narrow, low intensity region that is observed at the core's periphery as a dark band shows outflows and increased spectral line broadening. This dark band is found to exist for days and appears between the bright coronal loop structures of different coronal topologies. We find a case where the dark band region is formed between the magnetic field from emerging flux and the field of the pre-existing flux. A magnetic field extrapolation indicates that this dark band is coincident with the spine lines or magnetic separatrices in the extrapolated field. This occurs over unipolar regions where the brightened coronal field is separated in connectivity and topology. This separation does not appear to be infinitesimal and an initial estimate of the minimum distance of separation is found to be Almost-Equal-To 1.5-3.5 Mm.

Scott, J. T.; Martens, P. C. H.; Tarr, L. [Department of Physics, Montana State University, Bozeman, MT 59717 (United States)

2013-03-10T23:59:59.000Z

317

Scaling of distributions of sums of positions for chaotic dynamics at band-splitting points  

E-Print Network (OSTI)

The stationary distributions of sums of positions of trajectories generated by the logistic map have been found to follow a basic renormalization group (RG) structure: a nontrivial fixed-point multi-scale distribution at the period-doubling onset of chaos and a Gaussian trivial fixed-point distribution for all chaotic attractors. Here we describe in detail the crossover distributions that can be generated at chaotic band-splitting points that mediate between the aforementioned fixed-point distributions. Self affinity in the chaotic region imprints scaling features to the crossover distributions along the sequence of band splitting points. The trajectories that give rise to these distributions are governed first by the sequential formation of phase-space gaps when, initially uniformly-distributed, sets of trajectories evolve towards the chaotic band attractors. Subsequently, the summation of positions of trajectories already within the chaotic bands closes those gaps. The possible shapes of the resultant distributions depend crucially on the disposal of sets of early positions in the sums and the stoppage of the number of terms retained in them.

Alvaro Diaz-Ruelas; Miguel Angel Fuentes; Alberto Robledo

2014-09-26T23:59:59.000Z

318

On the propagation of a shear band in a steel tube  

SciTech Connect

Marchand and Duffy tested thin-walled steel tubes in a split Hopkinson torsion bar at a nominal strain-rate of approximately 1,600/s and could not determine conclusively whether a shear band initiating at a point in the tube propagated around the circumference in one direction or in both directions. They estimated the speed of propagation to be 520 m/s in the former case and 260 m/s in the latter. Here, the authors simulate their test numerically, and find that the shear band propagates in both directions around the circumference of the tube. When the tube is twisted at a nominal strain-rate of 5,000/s, the band speed varies from 180 m/s at the site of the initiation to approximately 1,000 m/s at the nearly diametrically opposite point. The band speed increases with an increase in the nominal strain-rate. The material defect is modeled by assuming that a small region near the center of the tubular surface is made of a material weaker than that of the rest of the tube.

Batra, R.C.; Zhang, X. (Univ. of Missouri, Rolla, MO (United States))

1994-04-01T23:59:59.000Z

319

Chlorophyll a algorithms for oligotrophic oceans: A novel approach based on three-band reflectance difference  

E-Print Network (OSTI)

traditional band ratios and Chl, which was further validated using global data collected concurrently by ship is particularly useful to improve the detection of various ocean features such as eddies. Preliminary tests over on radiative transfer theory (Sathyendranath et al. [1989], Carder et al. [1999], Maritorena et al. [2002

Meyers, Steven D.

320

Irreversible Thermodynamics Approach and Modeling of Shear-Banding Flow of Wormlike Micelles  

Science Journals Connector (OSTI)

44430, Mexico ... The flow in a pipe of wormlike micellar solutions is examined using a simple model that consists of the codeformational Maxwell constitutive equation and a kinetic equation that accounts for the breaking and reformation of micelles. ... The stress plateau is set in our model by the criterion of equal extended Gibbs free energy of the bands. ...

F. Bautista; J. F. A. Soltero; E. R. Macas; J. E. Puig; O. Manero

2002-11-21T23:59:59.000Z

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

The broad-band fractal nature of heterogeneity in the upper crust from petrophysical logs  

Science Journals Connector (OSTI)

......1991. Deep borehole log evidence for...heterogeneity and large-scale velocity...Continental Deep-Drilling (KTB) Holes...results, for the borehole data, show broad-band...spectral scaling in borehole logs, Geophys...23, 31193122. large-scale velocity......

Sean S. Dolan; Christopher J. Bean; Bruno Riollet

1998-03-01T23:59:59.000Z

322

Efficient and Scalable All-to-All Personalized Exchange for InfiniBand  

E-Print Network (OSTI)

· High performance ­ Low latency of lesser than 5us ­ Over 840 Mega Byte/s uni-directional bandwidth? ­ Can we utilize the InfiniBand RDMA and Gather/Scatter capabilities? ­ How can we achieve better of pinning is high ­ Solution for small messages: copy into a pre-registered buffer [liuj-ics03] ­ Cost

Panda, Dhabaleswar K.

323

Intermediate-band solar cells based on quantum dot supracrystals Q. Shao and A. A. Balandina  

E-Print Network (OSTI)

. © 2007 American Institute of Physics. DOI: 10.1063/1.2799172 The energy conversion efficiency is a key one to tune the band structure and enhance the light absorption and carrier transport. A first to about 33%.1 The the- oretical thermodynamic limit on the conversion of sunlight to electricity is much

324

Current transport, gate dielectrics and band gap engineering in graphene devices  

E-Print Network (OSTI)

Current transport, gate dielectrics and band gap engineering in graphene devices Wenjuan Zhu In this work, we studied current transport in mono-, bi- and tri-layer graphene. We find that both of the electrical field of the substrate surface polar phonons in bi-layer/tri-layer graphenes. We also find

Perebeinos, Vasili

325

Ultrathin, high-efficiency, broad-band, omni-acceptance, organic solar cells enhanced by  

E-Print Network (OSTI)

: Three of central challenges in solar cells are high light coupling into solar cell, high light trappingUltrathin, high-efficiency, broad-band, omni- acceptance, organic solar cells enhanced by plasmonic and demonstration of a new ultra-thin high- efficiency organic solar cell (SC), termed "plasmonic cavity

326

Metallic photonic-band-gap filament architectures for optimized incandescent lighting Sajeev John and Rongzhou Wang  

E-Print Network (OSTI)

Metallic photonic-band-gap filament architectures for optimized incandescent lighting Sajeev John occur 3,4 . Tra- ditionally incandescent lighting filaments, despite being driven from equilibrium the blackbody spectrum. This suggests the pos- sibility of higher efficiency incandescent lighting, through

John, Sajeev

327

Energy Band-Gap Engineering of Graphene Nanoribbons Melinda Y. Han,1  

E-Print Network (OSTI)

, New York, New York 10027, USA 2 Department of Physics, Columbia University, New York, New York 10027Energy Band-Gap Engineering of Graphene Nanoribbons Melinda Y. Han,1 Barbaros O¨ zyilmaz,2 Yuanbo an energy gap near the charge neutrality point. Individual graphene layers are contacted with metal

Kim, Philip

328

Electroabsorption modulator performance predicted from band-edge absorption spectra of bulk, quantum-well,  

E-Print Network (OSTI)

, quantum-well, and quantum-well-intermixed InGaAsP structures Gordon B. Morrison a,*, James W. Raring c-well-intermixed InGaAsP material are collected and compared using photocurrent spectroscopy. The expected will change the band-edge absorp- tion spectrum. This property can be induced in InGaAsP by two distinct

Coldren, Larry A.

329

V-band Transmission and Reflection Grid Amplifier Packaged in Waveguide  

E-Print Network (OSTI)

for thermal management by allowing the heat sink to be mounted on one side of the grid array. It also reduces and cooling fan were used to remove heat from the chip. The temperature distribution across the grid aperture1 V-band Transmission and Reflection Grid Amplifier Packaged in Waveguide Chun-Tung Cheung1 , Roger

330

Shape coexistence from the structure of the yrast band in Pt174  

Science Journals Connector (OSTI)

Excited states in the very neutron-deficient nucleus Pt174 have been identified up to spin 14. An irregular yrast sequence was observed beginning with a high 2+?0+ energy. It can be interpreted as the result of a change from a weakly deformed ground-state band, to a well-deformed rotor, near spin 6.

G. D. Dracoulis; B. Fabricius; A. E. Stuchbery; A. O. Macchiavelli; W. Korten; F. Azaiez; E. Rubel; M. A. Deleplanque; R. M. Diamond; F. S. Stephens

1991-10-01T23:59:59.000Z

331

Size effect on the electronic and optical band gap of CdSe QD  

SciTech Connect

Present paper deals with a critical and comprehensive analysis of the dependence of photo emission (PE) electronic band gap and optical absorption (OA) excitonic band gap on the size of CdSe QD, via connecting it with excitonic absorbance wavelength. Excitonic absorbance wavelength is determined through an empirical fit of established experimental evidences. Effective excitonic charge and Bohr radius is determined as a function of size. Increase in size of the CdSe QD results in greater Bohr radius and smaller effective excitonic charge. Excitonic binding energy as a degree of size of QD is also calculated which further relates with the difference in PE electronic and OA optical band gaps. It is also shown that with increase in size of CdSe QD, the excitonic binding energy decreases which consequently increases differences in two band gaps. Our results are very well comparable with the established results. Explanation for the origin of the unusual optical properties of CdSe QD has been also discussed.

Sisodia, Namita, E-mail: namitasisodiya@gmail.com [Department of Physics, Holkar Science College, Indore-45200 (India)

2014-04-24T23:59:59.000Z

332

Synchronous Ultra-Wide Band Wireless Sensors Networks for oil and gas exploration  

E-Print Network (OSTI)

Synchronous Ultra-Wide Band Wireless Sensors Networks for oil and gas exploration Stefano Savazzi1 of new oil and gas reservoir. Seismic exploration requires a large number (500 ÷ 2000 nodes, MAC and network layer to develop wireless sensors networks tailored for oil (and gas) exploration

Savazzi, Stefano

333

Space-based detection of wetlands' surface water level changes from L-band SAR interferometry  

E-Print Network (OSTI)

Space-based detection of wetlands' surface water level changes from L-band SAR interferometry­1996 reveals detectable surface changes in the Everglades wetlands. Although our study is limited to south Florida it has implication for other large-scale wetlands, because south Florida wetlands have diverse

Amelung, Falk

334

Efficient narrow-band light emission from a single carbon nanotube pn diode  

E-Print Network (OSTI)

Efficient narrow-band light emission from a single carbon nanotube p­n diode Thomas Mueller1 and Phaedon Avouris1 * Electrically driven light emission from carbon nanotubes1­8 could be used in nanoscale. Here, we report electrically induced light emission from individual carbon nanotube p­n diodes. A new

Perebeinos, Vasili

335

Forward Raman compression via photonic band gap in metals or warm dense matter  

SciTech Connect

The group velocity of a light pulse in photonic band gap material could considerably deviate from the speed of light in vacuum. A forward stoke and a pump pulse of different speeds would enable the Raman compression in metals or the warm dense matter. A small window of the parameter regime, where the compression is feasible via the forward Raman scattering, is identified.

Son, S. [18 Caleb Lane, Princeton, New Jersey 08540 (United States); Moon, Sung Joon [Program in Applied and Computational Mathematics, Princeton University, Princeton, New Jersey 08544 (United States)

2011-08-15T23:59:59.000Z

336

THE MULTIWAVELENGTH SURVEY BY YALE-CHILE (MUSYC): DEEP MEDIUM-BAND OPTICAL IMAGING AND HIGH-QUALITY 32-BAND PHOTOMETRIC REDSHIFTS IN THE ECDF-S  

SciTech Connect

We present deep optical 18-medium-band photometry from the Subaru telescope over the {approx}30' x 30' Extended Chandra Deep Field-South, as part of the Multiwavelength Survey by Yale-Chile (MUSYC). This field has a wealth of ground- and space-based ancillary data, and contains the GOODS-South field and the Hubble Ultra Deep Field. We combine the Subaru imaging with existing UBVRIzJHK and Spitzer IRAC images to create a uniform catalog. Detecting sources in the MUSYC 'BVR' image we find {approx}40,000 galaxies with R {sub AB} < 25.3, the median 5{sigma} limit of the 18 medium bands. Photometric redshifts are determined using the EAzY code and compared to {approx}2000 spectroscopic redshifts in this field. The medium-band filters provide very accurate redshifts for the (bright) subset of galaxies with spectroscopic redshifts, particularly at 0.1 < z < 1.2 and at z {approx}> 3.5. For 0.1 < z < 1.2, we find a 1{sigma} scatter in {Delta}z/(1 + z) of 0.007, similar to results obtained with a similar filter set in the COSMOS field. As a demonstration of the data quality, we show that the red sequence and blue cloud can be cleanly identified in rest-frame color-magnitude diagrams at 0.1 < z < 1.2. We find that {approx}20% of the red sequence galaxies show evidence of dust emission at longer rest-frame wavelengths. The reduced images, photometric catalog, and photometric redshifts are provided through the public MUSYC Web site.

Cardamone, Carolin N.; Van Dokkum, Pieter G.; Urry, C. Megan; Brammer, Gabriel [Department of Astronomy, Yale University, New Haven, CT 06511 (United States); Taniguchi, Yoshi [Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577 (Japan); Gawiser, Eric; Bond, Nicholas [Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854-8019 (United States); Taylor, Edward; Damen, Maaike [Sterrewacht Leiden, Leiden University, NL-2300 RA Leiden (Netherlands); Treister, Ezequiel [Institute for Astronomy, 2680 Woodlawn Drive, University of Hawaii, Honolulu, HI 96822 (United States); Cobb, Bethany E. [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Schawinski, Kevin [Yale Center for Astronomy and Astrophysics, Yale University, P.O. Box 208121, New Haven, CT 06520 (United States); Lira, Paulina [Departamento de Astronoma, Universidad de Chile, Casilla 36-D, Santiago (Chile); Murayama, Takashi [Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578 (Japan); Saito, Tomoki [Institute for Physics and Mathematics of the Universe, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 (Japan); Sumikawa, Kentaro, E-mail: carolin.cardamone@astro.yale.ed [Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama 790-8577 (Japan)

2010-08-15T23:59:59.000Z

337

Roles of nanoclusters in shear banding and plastic deformation of bulk metallic glasses  

SciTech Connect

During the course of this research we published 33 papers in various physics/material journals. We select four representing papers in this report and their results are summarized as follows. I. To study shear banding process, it is pertinent to know the intrinsic shear strain rate within a propagating shear band. To this aim, we used nanoindentation technique to probe the mechanical response of a Au49Ag5.5Pd2.3Cu26.9Si16.3 bulk metallic glass in locality and found notable pop-in events associated with shear band emission. Using a free volume model and under the situation when temperature and stress/hardness are fixed result in an equation, which predicts that hardness serration caused by pop-in decreases exponentially with the strain rate. Our data are in good agreement with the prediction. The result also predicts that, when strain rate is higher than a critical strain rate of 1700 s^-1, there will be no hardness serration, thereby no pop-in. In other words, multiple shear bandings will take place and material will flow homogeneously. The critical strain rate of 1700 s^-1 can be treated as the intrinsic strain rate within a shear band. We subsequently carried out a simulation study and showed that, if the imposed strain rate was over , the shear band spacing would become so small that the entire sample would virtually behave like one major shear band. Using the datum strain rate =1700 s^-1 and based on a shear band nucleation model proposed by us, the size of a shear-band nucleus in Au-BMG was estimated to be 3 ???? 10^6 atoms, or a sphere of ~30 nm in diameter. II. Inspired by the peculiar result published in a Science article ?¢????Super Plastic Bulk Metallic Glasses at Room Temperature?¢???, we synthesized the Zr-based bulk metallic glass with a composition identical to that in the paper (Zr64.13Cu15.75Ni10.12Al10) and, subsequently, tested in compression at the same slow strain rate (~10^-4 s^-1). We found that the dominant deformation mode is always single shear. The stress-strain curve exhibited serrated pattern in the plastic region, which conventionally has been attributed to individual shear band propagation. The scanning electron micrographs taken from the deformed sample surface revealed regularly spaced striations. Analysis indicates that the observed stress-strain serrations are intimately related to the striations on the shear surface, suggesting the serrations were actually caused slip-and-stick shear along the principal shear plane. We further use video camera to conduct in situ compression experiments to unambiguously confirm the one-to-one temporal and spatial correspondence between the intermittent sliding and flow serration. This preferential shear band formation along the principal shear plane is, in fact, a natural consequence of Mode II crack, independent of strain softening or hardening, usually claimed in the literature. III. Flow serration in compression of metallic glasses is caused by the formation and propagation of localized shear bands. These shear bands propagate at an extremely high speed, so high that a load cell and load frame were unable to capture the details of the dynamic event. To subdue this problem, we conducted uniaxial compression on Zr64.13Cu15.75Ni10.12Al10 bulk metallic glass using a high-speed camera to capture the sample image and also high-sensitivity strain gauges attached to the test samples to directly measure the strain. The displacement-time curves obtained from the test and a magnified version of the displacement burst reveals clearly a three-step (acceleration, steady-state, and deceleration) process during shear band propagation. The fastest propagating speed occurring at the steady state is calculated as 8????10^2 ???µm/s. This speed is about 1,000 times faster than the crosshead speed. This explains the gradual disappearance of flow serration at higher strain rates previously reported during compression of

Nieh, T.G.

2012-07-31T23:59:59.000Z

338

Topology and Design of Wide-Band 3D Metamaterials made of Periodically Loaded Transmission Line Arrays  

E-Print Network (OSTI)

Topology and Design of Wide-Band 3D Metamaterials made of Periodically Loaded Transmission Line index over a wide frequency band. These metamaterials consist of a three- dimensional transmission line and permeability. The cubic-cell transmission line host network is a physical realization of the 3D distributed

Tentzeris, Manos

339

An access etiquette for very-wide wireless bands R. Garcesa,*, J.J. Garcia-Luna-Acevesb  

E-Print Network (OSTI)

, 901 San Antonio Road, Palo Alto, CA 94303, USA d Department of Electrical Engineering, Technion," for the 59­64 GHz unlicensed band to allow systems from different manufacturers with different physical cable. However, equipment may not be operated on this band, until an etiquette has been defined for its

California at Santa Cruz, University of

340

268 IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL. 9, 2010 Dual-Band Miniaturized Patch Antennas for  

E-Print Network (OSTI)

268 IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL. 9, 2010 Dual-Band Miniaturized Patch a miniaturized, dual-band patch antenna array element that is designed for use in a three-dimensional (3-D the fundamental reso- nant mode of the patch antenna and one of its higher order modes. Miniaturization and tuning

Sheridan, Jennifer

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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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341

On the nature of the extragalactic number counts in the K-band  

E-Print Network (OSTI)

We investigate the causes of the different shape of the $K$-band number counts when compared to other bands, analyzing in detail the presence of a change in the slope around $K\\sim17.5$. We present a near-infrared imaging survey, conducted at the 3.5m telescope of the Calar Alto Spanish-German Astronomical Center (CAHA), covering two separated fields centered on the HFDN and the Groth field, with a total combined area of $\\sim0.27$deg$^{2}$ to a depth of $K\\sim19$ ($3\\sigma$,Vega). We derive luminosity functions from the observed $K$-band in the redshift range [0.25-1.25], that are combined with data from the references in multiple bands and redshifts, to build up the $K$-band number count distribution. We find that the overall shape of the number counts can be grouped into three regimes: the classic Euclidean slope regime ($d\\log N/dm\\sim0.6$) at bright magnitudes; a transition regime at intermediate magnitudes, dominated by $M^{\\ast}$ galaxies at the redshift that maximizes the product $\\phi^{\\ast}\\frac{dV_{c}}{d\\Omega}$; and an $\\alpha$ dominated regime at faint magnitudes, where the slope asymptotically approaches -0.4($\\alpha$+1) controlled by post-$M^{\\ast}$ galaxies. The slope of the $K$-band number counts presents an averaged decrement of $\\sim50%$ in the range $15.5

G. Barro; J. Gallego; P. G. Prez-Gonzlez; C. Eliche-Moral; M. Balcells; V. Villar; N. Cardiel; D. Cristobal-Hornillos; A. Gil de Paz; R. Gzman; R. Pell; M. Prieto; J. Zamorano

2008-11-19T23:59:59.000Z

342

Tunability over three frequency bands induced by mode transition in relativistic backward wave oscillator with strong end reflections  

SciTech Connect

This paper presents an efficient approach to realizing the frequency tunability of a relativistic backward wave oscillator (RBWO) over three frequency bands by mode transition without changing the slow wave structure (SWS). It is figured out that the transition of the operation mode in the RBWO can be efficiently achieved by using the strong end reflection of the SWS. This mode transition results in the tunability of the RBWO over three frequency bands at high power and high efficiency without changing the SWS. In numerical simulation, the output frequency of the RBWO can jump over 7.9?GHz in C-band, 9.9?GHz in X-band, and 12.4?GHz in Ku-band with output power exceeding 3.0?GW and conversion efficiency higher than 35% by just reasonably transforming the structures of the front and post resonant reflectors which provide the strong end reflection for the SWS.

Wu, Ping; Deng, Yuqun [Department of Engineering Physics, Tsinghua University, Beijing 100084 (China); Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024 (China); Fan, Juping; Teng, Yan; Shi, Yanchao; Sun, Jun [Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024 (China)

2014-10-15T23:59:59.000Z

343

Additional bands of the ArD2O intramolecular bending mode observed using a quantum cascade laser  

Science Journals Connector (OSTI)

Three new rovibrational bands of ArD2O have been observed in the ?2 bending region of D2O using a quantum cascade laser based cavity ringdown spectrometer. In addition, further observations of the ?(110, ?2=1)??(101) band reported by Li et al. (J. Mol. Spectrosc. 272 (2012) 2731) have been made. All bands were fit by treating the complex using a pseudo-diatomic model which treats the D2O as a free rotor within the complex. Molecular constants have been obtained using this model and are reported with deviations in the fits ranging from 0.0002cm?1 to 0.0005 cm?1. Two of the newly observed bands are tentatively assigned as the ?(202, ?2=1)??(111) and ?(211, ?2=1)??(202) bands, which have not previously been observed in other spectral regions.

Jacob T. Stewart; Benjamin J. McCall

2012-01-01T23:59:59.000Z

344

COO-3072-119 RESULTS ON THE PERFORMANCE OF A BROAD BAND FOCUSSING CHERENKOV COUNTER*  

NLE Websites -- All DOE Office Websites (Extended Search)

3072-119 3072-119 ^ RESULTS ON THE PERFORMANCE OF A BROAD BAND FOCUSSING CHERENKOV COUNTER* Sherman,"'"'' R. C. W e b b , ' ' ' " ' ' " ' " M. ^.otov-~ S C i i v ^ ^ - - ^ - ^ Cester, V. L. Fitch, A. Montag, S. Sherman, R. C. Webb, M. S. Witherell Department of Physics, Princeton University, Princeton, N. J. 085A4 Abstract The field of ring imaging (broad band differential) Cherenkov detectors-^ has become a very active area of interest in detector development at several high energy physics laboratories. Our group has previously report- ed2 on a method of Cherenkov ring imaging for a counter with large momentum and angular acceptance using stan- dard photo multipliers. Recently, we have applied this technique to the design of a set of Cherenkov counters

345

Ultraviolet - "Green" Energy in the "C" Band  

NLE Websites -- All DOE Office Websites (Extended Search)

Ultraviolet - "Green" Energy in the "C" Band Ultraviolet - "Green" Energy in the "C" Band Speaker(s): Forrest Fencl Date: April 16, 2009 - 12:00pm Location: 90-3122 Mr. Forrest Fencl of UV Resources, Inc. will discuss how air conditioning system operation, maintenance, and utilization influence system cooling capacity and indoor air quality. The use of ultraviolet germicidal radiation to clean heat exchangers and maintain their efficiency will be reviewed and energy savings estimates will be provided. Additionally, he will discuss why UV-C is considered the "green" cleaner and how widely it is used today as an engineering strategy for precluding the growth, dissemination and recirculation of microbial contaminants. For more information about this seminar, please contact: Bill Fisk(510) 486-591

346

Ocean Aerosols: The Marine Fast-Rotating Shadow-Band Radiometer Network  

NLE Websites -- All DOE Office Websites (Extended Search)

Ocean Aerosols: The Marine Fast-Rotating Ocean Aerosols: The Marine Fast-Rotating Shadow-Band Radiometer Network M. A. Miller, R. M. Reynolds, and J. J. Bartholomew Brookhaven National Laboratory Upton, New York Introduction A network of ship-mounted marine fast-rotating shadow-band radiometers (FRSRs) and broadband radiometers have been deployed over the fast four years on several backbone ships, funded jointly by Atmospheric Radiation Measurement (ARM) and National Aeronautic and Space Administration's (NASA's) Sensor Intercomparison and Merger for Biological and Interdisciplinary Studies (SIMBIOS). These radiometers operate continuously and automatically during daylight hours. There fundamental measurements made by the FRSRs in the network are the direct-normal irradiance

347

RESEARCH AND DEVELOPMENT FOR AN X-BAND LINEAR COLLIDER* C. Adolphsen  

NLE Websites -- All DOE Office Websites (Extended Search)

AND DEVELOPMENT FOR AN AND DEVELOPMENT FOR AN X-BAND LINEAR COLLIDER* C. Adolphsen Stanford Linear Accelerator Center, Stanford University, Stanford CA 94309 USA Abstract At SLAC and KEK research is advancing toward a design for an electron-positron linear collider based on X-Band (11.4 GHz) rf accelerator technology. The nominal acceleration gradient in its main linacs will be about four times that in the Stanford Linear Collider (SLC). The design targets a 1.0 TeV center-of-mass energy but envisions initial operation at 0.5 TeV and allows for expansion to 1.5 TeV. A 10 34 cm -2 s -1 luminosity level will be achieved by colliding multiple bunches per pulse with bunch emittances about two orders of magnitude smaller than those in the SLC. The key components needed to realize such a collider are

348

z'-BAND GROUND-BASED DETECTION OF THE SECONDARY ECLIPSE OF WASP-19b  

SciTech Connect

We present the ground-based detection of the secondary eclipse of the transiting exoplanet WASP-19b. The observations were made in the Sloan z' band using the ULTRACAM triple-beam CCD camera mounted on the New Technology Telescope. The measurement shows a 0.088% {+-} 0.019% eclipse depth, matching previous predictions based on H- and K-band measurements. We discuss in detail our approach to the removal of errors arising due to systematics in the data set, in addition to fitting a model transit to our data. This fit returns an eclipse center, T{sub 0}, of 2455578.7676 HJD, consistent with a circular orbit. Our measurement of the secondary eclipse depth is also compared to model atmospheres of WASP-19b and is found to be consistent with previous measurements at longer wavelengths for the model atmospheres we investigated.

Burton, J. R.; Watson, C. A.; Pollacco, D. [Astrophysics Research Centre, Queen's University Belfast, Belfast BT7 1NN (United Kingdom); Littlefair, S. P.; Dhillon, V. S. [Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH (United Kingdom); Gibson, N. P. [Department of Physics, University of Oxford, Oxford OX1 3RH (United Kingdom); Marsh, T. R., E-mail: jburton04@qub.ac.uk [Department of Physics and Astronomy, University of Warwick, Coventry CV4 7AL (United Kingdom)

2012-08-01T23:59:59.000Z

349

Broad-band Spectral Properties of Accreting X-ray Binary Pulsars  

E-Print Network (OSTI)

Broad-band spectra of accreting X-ray binary pulsars can be fit by a phenomenological model composed by a power law with a high energy rollover above 10 keV, plus a blackbody component with a temperature of few hundred eV. While, at least qualitatively, the hard tail can be explained in terms of (inverse) Compton scattering, the origin of the soft component cannot find a unique explanation. Recently a qualitative picture able to explain the overall broad band-spectrum of luminous X-ray pulsars was carried out by taking into account the effect of bulk Comptonization in the accretion column. After a review on these recent theoretical developments, I will present a case study of how different modelization of the continuum affect broad features, in particular the cyclotron resonance features in Vela X-1.

Mauro Orlandini

2005-10-10T23:59:59.000Z

350

Modeling of electroabsorption in semiconductor quantum structures within the eight-band k?p theory  

Science Journals Connector (OSTI)

We have incorporated electric fields into the eight-band k?p theory, which we have applied to heterostructures, in conjunction with the envelope-function approximation. We use the method of Baraff and Gershoni to implement the electric-field effects in a computer program that calculates the optical properties of direct-band-gap heterostructures in one, two, and three dimensions. Using this method, we calculate the interband and intersubband electroabsorption of multiple quantum wells as well as the interband electroabsorption in superlattices. We illustrate the evolution of the Stark localization of the electron wave function under the application of an external electric field in superlattices. Comparison with experimental data, available in the literature, exhibits very good agreement between theory and experiment, with respect to the spectral shape, the absolute magnitude, and the electric-field dependence of the absorption.

Mats-Erik Pistol and David Gershoni

1994-10-15T23:59:59.000Z

351

Structure of the yrast band in the odd-odd deformed nucleus {sup 156}Pm  

SciTech Connect

The six-level sequence deduced for the odd-odd nucleus {sup 156}Pm in the high-spin studies following spontaneous fission of {sup 252}Cf is shown to constitute the K{sup {pi}=}4{sup +} yrast band having the two-quasiparticle configuration {l_brace}p:5/2[532]+ n:3/2[521]{r_brace}. Spin parities I{sup {pi}=}4{sup +} through 9{sup +} are assigned to the earlier suggested six levels. The location and the decay {gamma}'s of the 10{sup +} level of this band are indicated. It is also pointed out that there are no {gamma} rays common to these postfission high-spin spectra and those seen in the {sup 156}Nd {beta}-decay studies.

Sood, P. C.; Sai, K. Vijay; Gowrishankar, R. [Department of Physics, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam (AP) 515134 (India); Sainath, M. [Department of Physics, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam (AP) 515134 (India); Department of Physics, Rajiv Gandhi University of Knowledge Technologies, Hyderabad (AP) 500032 (India)

2011-05-15T23:59:59.000Z

352

Rotational bands in odd-A Cm and Cf isotopes: Exploring the highest neutron orbitals  

SciTech Connect

Rotational bands have been identified up to high spins ({approx_equal}28({h_bar}/2{pi})) in the odd-A nuclei {sup 247,249}Cm and {sup 249}Cf through inelastic excitation and transfer reactions around the Z=100 region where stability results from shell effects. The [620]1/2 Nilsson configuration in {sup 249}Cm is the highest-lying neutron orbital, from above the N=164 spherical subshell gap, for which high-spin rotational behavior has been established. The data allow for an unambiguous experimental assignment of configurations to the observed bands, unusual for odd-A nuclei near Z=100. The high-spin properties are described in terms of Woods-Saxon cranking calculations.

Tandel, S. K.; Chowdhury, P.; Lakshmi, S.; Tandel, U. S. [Department of Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854 (United States); Ahmad, I.; Carpenter, M. P.; Gros, S.; Janssens, R. V. F.; Khoo, T. L.; Kondev, F. G.; Greene, J. P.; Lauritsen, T.; Lister, C. J.; Peterson, D.; Robinson, A.; Seweryniak, D.; Zhu, S. [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Hartley, D. J. [Department of Physics, US Naval Academy, Annapolis, Maryland 21402 (United States)

2010-10-15T23:59:59.000Z

353

Near-Infrared Classification Spectroscopy: H-band Spectra of Fundamental MK Standards  

E-Print Network (OSTI)

We present a catalogue of H-band spectra for 85 stars of approximately solar abundance observed at a resolving power of 3000 with the KPNO Mayall 4m FTS. The atlas covers spectral types O7-M5 and luminosity classes I-V as defined on the MK system. We identify both atomic and molecular indices and line-ratios which are temperature and luminosity sensitive allowing spectral classification to be carried out in the H-band. The line ratios permit spectral classification in the presence of continuum excess emission, which is commonly found in pre-main sequence and evolved stars. We demonstrate that with spectra of R = 1000 obtained at SNR > 50 it is possible to derive spectral types within +- 2 subclasses for late-type stars. These data are available electronically through the Astronomical Data Center in addition to being served on the World-Wide-Web.

Michael R. Meyer; Suzan Edwards; Kenneth H. Hinkle; Stephen E. Strom

1998-08-19T23:59:59.000Z

354

New Precision in Cosmic Ray Measurements; Yielding Extension of Spectrum and Indications of Bands  

Science Journals Connector (OSTI)

Method of measurement of capacities of the order of one cm.A method is described which leads to greatly increased precision in the measurement of capacities of the order of one electrostatic unit.More penetrating cosmic rays than we have previously found are indicated by a new absorption curve obtained in Gem Lake (9080 ft.) and Lake Arrowhead (5125 ft.) with much greater precision than hitherto possible.Cosmic-ray spectrum.The new curve affords definite evidence for the existence of bands in the spectrum of cosmic rays. The measurements indicate that the cosmic rays consist chiefly of two bands about three octaves apart of mean absorption coefficients 0.35 and 0.04 to 0.05 per meter of water.The total energy of cosmic rays at the top of the atmosphere is found to be very nearly one-tenth that due to starlight and heat as computed from Seares' data.

R. A. Millikan and G. H. Cameron

1928-06-01T23:59:59.000Z

355

Energy band modulation of graphane by hydrogen-vacancy chains: A first-principles study  

SciTech Connect

We investigated a variety of configurations of hydrogen-vacancy chains in graphane by first-principles density functional calculation. We found that graphane with two zigzag H-vacancy chains segregated by one or more H chain is generally a nonmagnetic conductor or has a negligible band gap. However, the same structure is turned into a semiconductor and generates a magnetic moment if either one or both of the vacancy chains are blocked by isolated H atoms. If H-vacancy chains are continuously distributed, the structure is similar to a zigzag graphene nanoribbon embedded in graphane. It was also found that the embedded zigzag graphene nanoribbon is antiferromagnetic, and isolated H atoms left in the 2-chain nanoribbon can tune the band gap and generate net magnetic moments. Similar effects are also obtained if bare carbon atoms are present outside the nanoribbon. These results are useful for designing graphene-based nanoelectronic circuits.

Wu, Bi-Ru [Department of Natural science, Center for General Education, Chang Gung University, Kueishan 333, Taiwan, ROC (China); Yang, Chih-Kai, E-mail: ckyang@nccu.edu.tw [Graduate Institute of Applied Physics, National Chengchi University, Taipei 11605, Taiwan, ROC (China)

2014-08-15T23:59:59.000Z

356

The effect of spin-orbit coupling in band structure of few-layer graphene  

SciTech Connect

Topological insulators are electronic materials that have a bulk band gap like an ordinary insulator but have protected conducting states on their edge or surface. This can be happened due to spin-orbit coupling and time-reversal symmetry. Moreover, the edge current flows through their edge or surface depends on its spin orientation and also it is robust against non-magnetic impurities. Therefore, topological insulators are predicted to be useful ranging from spintronics to quantum computation. Graphene was first predicted to be the precursor of topological insulator by Kane-Mele. They developed a Hamiltonian model to describe the gap opening in graphene. In this work, we investigate the band structure of few-layer graphene by using this model with analytical approach. The results of our calculations show that the gap opening occurs at K and K point, not only in single layer, but also in bilayer and trilayer graphene.

Sahdan, Muhammad Fauzi, E-mail: sahdan89@yahoo.co.id; Darma, Yudi, E-mail: sahdan89@yahoo.co.id [Department of Physics, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132 (Indonesia)

2014-03-24T23:59:59.000Z

357

Inorganic Graphenylene: A Porous Two-Dimensional Material With Tunable Band Gap  

E-Print Network (OSTI)

By means of ab initio calculations we investigate the possibility of existence of a boron nitride (BN) porous two-dimensional nanosheet which is geometrically similar to the carbon allotrope known as biphenylene carbon. The proposed structure, which we called Inorganic Graphenylene (IGP), is formed spontaneously after selective dehydrogenation of the porous Boron Nitride (BN) structure proposed by Ding et al. We study the structural and electronic properties of both porous BN and IGP and it is shown that, by selective substitution of B and N atoms with carbon atoms in these structures, the band gap can be significantly reduced, changing their behavior from insulators to semiconductors, thus opening the possibility of band gap engineering for this class of two-dimensional materials.

Perim, Eric; Atreto, Pedro Alves da Silva; Galvo, Douglas

2014-01-01T23:59:59.000Z

358

Multi-bands photoconductive response in AlGaN/GaN multiple quantum wells  

SciTech Connect

Based on the optical transitions among the quantum-confined electronic states in the conduction band, we have fabricated multi-bands AlGaN/GaN quantum well infrared photodetectors. Crack-free AlGaN/GaN multiple quantum wells (MQWs) with atomically sharp interfaces have been achieved by inserting an AlN interlayer, which releases most of the tensile strain in the MQWs grown on the GaN underlayer. With significant reduction of dark current by using thick AlGaN barriers, photoconductive responses are demonstrated due to intersubband transition in multiple regions with center wavelengths of 1.3, 2.3, and 4??m, which shows potential applications on near infrared detection.

Chen, G.; Rong, X.; Xu, F. J.; Tang, N. [State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871 (China); Wang, X. Q., E-mail: wangshi@pku.edu.cn; Shen, B., E-mail: bshen@pku.edu.cn [State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871 (China); Collaborative Innovation Center of Quantum Matter, Beijing (China); Fu, K.; Zhang, B. S. [Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Ruoshui Road 398, 215123 Suzhou (China); Hashimoto, H.; Yoshikawa, A. [Center for SMART Green Innovation Research, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522 (Japan); Ge, W. K. [Department of Physics, Tsinghua University, Beijing 100871 (China)

2014-04-28T23:59:59.000Z

359

Rotational structures in Ta174 and identical bands in the normal deformation regime  

Science Journals Connector (OSTI)

Ta174 has been studied through the Tm169(9Be,4n) fusion-evaporation reaction in the energy range E(9Be)=4065 MeV. ?- and x-ray in-beam and activity singles spectra, ?-?-t coincidences, and angular-distribution measurements were performed. Four rotational structures have been found and interpreted on the basis of coupling systematics. Mixing ratio signs have been calculated using a semiclassical method and compared with the signs of the angular-distribution coefficients, in order to consolidate configuration assignments. Identical bands, i.e., bands with similar transition energies, have been found in neighboring odd and doubly-odd Ta171-174. This similarity is interpreted here as due to fortuitous compensations between different transverse and collective angular momenta and moments of inertia.

D. Hojman; A. J. Kreiner; M. Davidson

1992-10-01T23:59:59.000Z

360

Pseudomorphic GeSn/Ge(001) quantum wells: Examining indirect band gap bowing  

SciTech Connect

A study of the bandgap character of compressively strained GeSn{sub 0.060-0.091}/Ge(001) quantum wells grown by molecular beam epitaxy is reported. The built-in strain in GeSn wells leads to an increased separation between L and {Gamma} conduction band minima. The prevalent indirect interband transitions in GeSn were probed by photoluminescence spectroscopy. As a result we could simulate the L-valley bowing parameter in GeSn alloys, b{sub L} = 0.80 {+-} 0.06 eV at 10 K. From this we conclude that even compressively strained GeSn/Ge(001) alloys could become direct band gap semiconductors at the Sn-fraction higher than 17.0 at. %.

Tonkikh, Alexander A. [Max Planck Institute of Microstructure Physics, Weinberg 2 D-06120, Halle (Saale) (Germany); Institute for Physics of Microstructures RAS, GSP-105, Nizhniy Novgorod (Russian Federation); Eisenschmidt, Christian; Schmidt, Georg [Institute of Physics, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 3 D-01620, Halle (Saale) (Germany); Talalaev, Vadim G. [Max Planck Institute of Microstructure Physics, Weinberg 2 D-06120, Halle (Saale) (Germany); ZIK SiLi-Nano, Martin Luther University Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Str. 3 D-06120, Halle (Saale) (Germany); Zakharov, Nikolay D.; Werner, Peter [Max Planck Institute of Microstructure Physics, Weinberg 2 D-06120, Halle (Saale) (Germany); Schilling, Joerg [ZIK SiLi-Nano, Martin Luther University Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Str. 3 D-06120, Halle (Saale) (Germany)

2013-07-15T23:59:59.000Z

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Vibration Stabilization of a Mechanical Model of a X-Band Linear Collider Final Focus Magnet  

SciTech Connect

The small beam sizes at the interaction point of a X-band linear collider require mechanical stabilization of the final focus magnets at the nanometer level. While passive systems provide adequate performance at many potential sites, active mechanical stabilization is useful if the natural or cultural ground vibration is higher than expected. A mechanical model of a room temperature linear collider final focus magnet has been constructed and actively stabilized with an accelerometer based system.

Frisch, Josef; Chang, Allison; Decker, Valentin; Doyle, Eric; Eriksson, Leif; Hendrickson, Linda; Himel, Thomas; Markiewicz, Thomas; Partridge, Richard; Seryi, Andrei; /SLAC

2006-09-28T23:59:59.000Z

362

Comments on "Electron band structure of solid methane: Ab initio calculations"  

Science Journals Connector (OSTI)

A recent ab initio band-structure calculation by Piela et al. for solid methane is reviewed critically. The analysis used by Piela et al. to determine which contributions to the Fock matrix are large is shown to be in error. This error has the effect that Piela et al. neglect terms in the two-center matrix element which are large and easy to evaluate and retain terms in the one-center matrix element which are small and difficult to evaluate.

A. Barry Kunz

1974-06-15T23:59:59.000Z

363

Timescale stretch parameterization of Type Ia supernova B-band light curves  

SciTech Connect

R-band intensity measurements along the light curve of Type Ia supernovae discovered by the Cosmology Project (SCP) are fitted in brightness to templates allowing a free parameter the time-axis width factor w identically equal to s times (1+z). The data points are then individually aligned in the time-axis, normalized and K-corrected back to the rest frame, after which the nearly 1300 normalized intensity measurements are found to lie on a well-determined common rest-frame B-band curve which we call the ''composite curve.'' The same procedure is applied to 18 low-redshift Calan/Tololo SNe with Z < 0.11; these nearly 300 B-band photometry points are found to lie on the composite curve equally well. The SCP search technique produces several measurements before maximum light for each supernova. We demonstrate that the linear stretch factor, s, which parameterizes the light-curve timescale appears independent of z, and applies equally well to the declining and rising parts of the light curve. In fact, the B band template that best fits this composite curve fits the individual supernova photometry data when stretched by a factor s with chi 2/DoF {approx} 1, thus as well as any parameterization can, given the current data sets. The measurement of the data of explosion, however, is model dependent and not tightly constrained by the current data. We also demonstrate the 1 + z light-cure time-axis broadening expected from cosmological expansion. This argues strongly against alternative explanations, such as tired light, for the redshift of distant objects.

Goldhaber, G.; Groom, D.E.; Kim, A.; Aldering, G.; Astier, P.; Conley, A.; Deustua, S.E.; Ellis, R.; Fabbro, S.; Fruchter, A.S.; Goobar, A.; Hook, I.; Irwin, M.; Kim, M.; Knop, R.A.; Lidman, C.; McMahon, R.; Nugent, P.E.; Pain, R.; Panagia, N.; Pennypacker, C.R.; Perlmutter, S.; Ruiz-Lapuente, P.; Schaefer, B.; Walton, N.A.; York, T.

2001-04-01T23:59:59.000Z

364

Miniaturized Multi-Band Antenna Design via Element Collocation and Inductive Feed Loading  

SciTech Connect

In a FY09 SDRD project, four separate antennas were designed to receive signals of interest covering a broad range of frequencies. While the elements exceeded specifications, the array footprint is substantial. Research performed by the CU Microwave Active Antenna Group in collaboration with RSL, showed promise in realizing a reduced structure. This work will expand upon this previous research. This project will result in a prototype quad-band antenna.

Martin, R. P.

2012-09-12T23:59:59.000Z

365

A NEW MULTI-BAND RADIAL VELOCITY TECHNIQUE FOR DETECTING EXOPLANETS AROUND ACTIVE STARS  

SciTech Connect

The radial velocity (RV) technique is one of the most efficient ways of detecting exoplanets. However, large RV jitters induced by starspots on an active star can inhibit detection of any exoplanet present or even lead to a false positive detection. This paper presents a new multi-band RV technique capable of substantially reducing starspot-induced RV jitters from stellar RV measurements to allow efficient and accurate extraction of RV signals caused by exoplanets. It takes full advantage of the correlation of RV jitters at different spectral bands and the independence of exoplanet signals at the corresponding bands. Simulations with a single-spot model and a multi-spot model have been conducted to investigate the RV jitter reduction capability of this method. The results show that this method can reduce the RV jitter amplitude by at least an order of magnitude, allowing detection of weaker exoplanet signals without significantly increasing RV observation time and cadence. This method can greatly reduce the observation time required to detect Earth-like planets around solar type stars with {approx}0.1 m s{sup -1} long term Doppler precision if spot-induced jitter is the dominant astrophysical noise source for RV measurements. This method can work efficiently for RV jitter removal if: (1) all the spots on a target star have approximately the same temperature during RV observations; (2) the RV jitter amplitude changes with wavelength, i.e., the RV jitter amplitude ratio, {alpha}, between two different spectral bands is not close to one; (3) the spot-induced RV jitter dominates the RV measurement error.

Ma Bo; Ge Jian, E-mail: boma@astro.ufl.edu, E-mail: jge@astrto.ufl.edu [Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611 (United States)

2012-05-10T23:59:59.000Z

366

Fond du Lac Band Leads Climate Resilience Efforts on Lake Superior Chippewa Indian Reservation  

Energy.gov (U.S. Department of Energy (DOE))

From the White House Council on Environmental Quality blog: Last Friday I had the pleasure of visiting the Fond du Lac Band of Lake Superior Chippewa Indian Reservation. We toured the reservation and facilities with tribal Chairwoman Karen Diver, a member of the Presidents State, Local, and Tribal Leaders Task Force on Climate Preparedness and Resilience, and the Tribes Resource Management Division.

367

Analysis of the interband optical transitions: Characterization of synthetic DNA band structure  

Science Journals Connector (OSTI)

We analyze the band structure and interband optical transitions in a dangling backbone ladder DNAmodel. Using this model semiconducting synthetic poly(G)-poly(C) DNA is studied by means of a tight-binding model traditionally used for transport studies. Numerical calculations for optical absorptionspectra are also presented. By studying the eigenstates symmetries in uniform and nonuniform DNA chains we conclude that in both cases the transitions are almost vertical in K space. The optical gap turns out larger than the electronic one and an indirect band gap electronic structure for this DNAmodel is revealed. The effects of the environment which are relevant for the wet form of DNA are taken into account by introducing disorder in the backbone levels. We demonstrate that they affect more the spectra in the case of parallel polarization of the incoming light (with respect to the molecule axis). In such a case the closure of the gap appears for a large enough disorder. We also consider the natural helix DNA conformation and find unusual selection rules for interband optical transitions. We propose that a comparison between the obtained spectra and the experiments can provide an insight into the electronic band structure of DNA.

Elena Daz

2008-01-01T23:59:59.000Z

368

Band offsets of ultrathin high-{kappa} oxide films with Si  

SciTech Connect

Valence- and conduction-band edges of ultrathin oxides (SiO{sub 2}, HfO{sub 2}, Hf{sub 0.7}Si{sub 0.3}O{sub 2}, ZrO{sub 2}, and Al{sub 2}O{sub 3}) grown on a silicon substrate have been measured using ultraviolet photoemission and inverse photoemission spectroscopies in the same UHV chamber. The combination of these two techniques has enabled the direct determination of the oxide energy gaps as well as the offsets of the oxide valence- and conduction-band edges from those of the silicon substrate. These results are supplemented with synchrotron x-ray photoemission spectroscopy measurements allowing further characterization of the oxide composition and the evaluation of the silicon substrate contribution to the spectra. The electron affinity has also been systematically measured on the same samples. We find reasonably good agreement with earlier experiments where assumptions regarding energy-gap values were needed to establish the conduction-band offsets. The systematics of our photoemission and inverse photoemission results on different ultrathin films provide a comprehensive comparison of these related systems.

Bersch, Eric; Rangan, Sylvie; Bartynski, Robert Allen; Garfunkel, Eric; Vescovo, Elio [Department of Physics and Astronomy and Laboratory for Surface Modification, Rutgers University, 136 Frelinghuysen Road, Piscataway, New Jersey 08854 (United States); Department of Chemistry and Chemical Biology and Laboratory for Surface Modification, Rutgers University, 610 Taylor Road, Piscataway, New Jersey 08854 (United States); National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States)

2008-08-15T23:59:59.000Z

369

Simultaneous multi-band detection of Low Surface Brightness galaxies with Markovian modelling  

E-Print Network (OSTI)

We present an algorithm for the detection of Low Surface Brightness (LSB) galaxies in images, called MARSIAA (MARkovian Software for Image Analysis in Astronomy), which is based on multi-scale Markovian modeling. MARSIAA can be applied simultaneously to different bands. It segments an image into a user-defined number of classes, according to their surface brightness and surroundings - typically, one or two classes contain the LSB structures. We have developed an algorithm, called DetectLSB, which allows the efficient identification of LSB galaxies from among the candidate sources selected by MARSIAA. To assess the robustness of our method, the method was applied to a set of 18 B and I band images (covering 1.3 square degrees in total) of the Virgo cluster. To further assess the completeness of the results of our method, both MARSIAA, SExtractor, and DetectLSB were applied to search for (i) mock Virgo LSB galaxies inserted into a set of deep Next Generation Virgo Survey (NGVS) gri-band subimages and (ii) Virgo...

Vollmer, B; Petremand, M; Lavigne, F; Collet, Ch; van Driel, W; Bonnarel, F; Louys, M; Sabatini, S; MacArthur, L A

2012-01-01T23:59:59.000Z

370

FERROELECTRIC SWITCH FOR A HIGH-POWER Ka-BAND ACTIVE PULSE COMPRESSOR  

SciTech Connect

Results are presented for design of a high-power microwave switch for operation at 34.3 GHz, intended for use in an active RF pulse compressor. The active element in the switch is a ring of ferroelectric material, whose dielectric constant can be rapidly changed by application of a high-voltage pulse. As envisioned, two of these switches would be built into a pair of delay lines, as in SLED-II at SLAC, so as to allow 30-MW ?s-length Ka-band pulses to be compressed in time by a factor-of-9 and multiplied in amplitude to generate 200 MW peak power pulses. Such high-power pulses could be used for testing and evaluation of high-gradient mm-wave accelerator structures, for example. Evaluation of the switch design was carried out with an X-band (11.43 GHz) prototype, built to incorporate all the features required for the Ka-band version.

Hirshfield, Jay L. [Omega-P, Inc.] [Omega-P, Inc.

2013-12-18T23:59:59.000Z

371

THE VELA PULSAR AND ITS LIKELY COUNTER-JET IN THE K{sub s} BAND  

SciTech Connect

We report the first high spatial resolution near-infrared (near-IR) imaging of the Vela pulsar in the K{sub s} band obtained with the new adaptive optics system recently mounted on the Gemini-South telescope. For the first time, we have firmly detected the pulsar in this band with K{sub s} ? 21.8 mag, and have resolved in detail an extended feature barely detected previously in the immediate vicinity of the pulsar in the J{sub s}H bands. The pulsar K{sub s} flux is fully consistent with the extension of the flat optical spectrum of the pulsar toward the IR and does not confirm the strong IR flux excess in the pulsar emission suggested earlier by the low spatial resolution data. The extended feature is about two times brighter than the pulsar and is likely associated with its X-ray counter-jet. It extends ?2'' southward of the pulsar along the X-ray counter-jet and shows knot-like structures and a red spectrum.

Zyuzin, D.; Shibanov, Yu.; Danilenko, A. [Ioffe Physical Technical Institute, Politekhnicheskaya 26, St. Petersburg 194021 (Russian Federation); Mennickent, R. E. [Department of Astronomy, Universidad de Concepcion, Casilla 160-C, Concepcion (Chile); Zharikov, S. [Observatorio Astronmico Nacional SPM, Instituto de Astronoma, UNAM, Ensenada, BC (Mexico)

2013-10-01T23:59:59.000Z

372

Spatial variation of void ratio and shear band thickness in sand using X-ray computed tomography  

SciTech Connect

A detailed study of spatial variation of void ratio and shear band thickness measurements is presented in this paper. A prismatic sand specimen that initially measured 57{center_dot}4 mm wide x 120{center_dot}5 mm long x 182{center_dot}1 mm high was sheared under plane-strain (biaxial) loading conditions. The specimen was prepared at a relative density of 79% using F-75 Ottawa sand. X-ray computed tomography was used to scan the specimen before shearing and after the onset of the shear band. The specimen failed through a single shear band with an inclination angle of 65{center_dot}6{sup o} measured from the direction of the minor principal stress. Computer algorithms were developed to calibrate CT images and quantify void ratio (e) variation within the specimen. CT data analysis revealed cross-sectional spatial variation in void ratio where density is higher in regions close to the edges of the specimen due to membrane effects and confining pressure with no significant variation in void ratio in the axial direction (top to bottom) before shearing. The shear band was easily identified from the CT images, and analysis of void ratio showed a noticeable jump in void ratio profile across the shear band. A detailed statistical summary of the thickness of the shear band and variation of void ratio across the shear band is presented and discussed.

Alshibli, K.A.; Hasan, A. (LSU)

2008-05-01T23:59:59.000Z

373

Simultaneous Multi-band Detection of Low Surface Brightness Galaxies with Markovian Modeling  

Science Journals Connector (OSTI)

We present to the astronomical community an algorithm for the detection of low surface brightness (LSB) galaxies in images, called MARSIAA (MARkovian Software for Image Analysis in Astronomy), which is based on multi-scale Markovian modeling. MARSIAA can be applied simultaneously to different bands. It segments an image into a user-defined number of classes, according to their surface brightness and surroundingstypically, one or two classes contain the LSB structures. We have developed an algorithm, called DetectLSB, which allows the efficient identification of LSB galaxies from among the candidate sources selected by MARSIAA. The application of the method to two and three bands simultaneously was tested on simulated images. Based on our tests, we are confident that we can detect LSB galaxies down to a central surface brightness level of only 1.5times the standard deviation from the mean pixel value in the image background. To assess the robustness of our method, the method was applied to a set of 18 B- and I-band images (covering 1.3deg2 in total) of the Virgo Cluster to which Sabatini et al. previously applied a matched-filter dwarf LSB galaxy search algorithm. We have detected all 20 objects from the Sabatini et al. catalog which we could classify by eye as bona fide LSB galaxies. Our method has also detected four additional Virgo Cluster LSB galaxy candidates undetected by Sabatini et al. To further assess the completeness of the results of our method, both MARSIAA, SExtractor, and DetectLSB were applied to search for (1) mock Virgo LSB galaxies inserted into a set of deep Next Generation Virgo Survey (NGVS) gri-band subimages and (2) Virgo LSB galaxies identified by eye in a full set of NGVS square degree gri images. MARSIAA/DetectLSB recovered ~20% more mock LSB galaxies and ~40% more LSB galaxies identified by eye than SExtractor/DetectLSB. With a 90% fraction of false positives from an entirely unsupervised pipeline, a completeness of 90% is reached for sources with r e > 3'' at a mean surface brightness level of ?g = 27.7magarcsec2 and a central surface brightness of ?0 g = 26.7magarcsec2. About 10% of the false positives are artifacts, the rest being background galaxies. We have found our proposed Markovian LSB galaxy detection method to be complementary to the application of matched filters and an optimized use of SExtractor, and to have the following advantages: it is scale free, can be applied simultaneously to several bands, and is well adapted for crowded regions on the sky.

B. Vollmer; B. Perret; M. Petremand; F. Lavigne; Ch. Collet; W. van Driel; F. Bonnarel; M. Louys; S. Sabatini; L. A. MacArthur

2013-01-01T23:59:59.000Z

374

Identification of the {gamma}-vibrational band built on the 11/2{sup -}[505] orbital in {sup 165}Er  

SciTech Connect

Excited states in {sup 165}Er have been populated using the {sup 160}Gd({sup 9}Be, 4n) reaction at beam energies of 42 and 45 MeV. A band consisting of two levels at excitation energies of 1317.6 and 1505.9 keV, both of which decay strongly to the 11/2{sup -}[505] band, is observed and assigned as the {gamma}-vibrational band built on the 11/2{sup -}[505] configuration. In addition, a newly identified level is proposed as a three-quasiparticle state.

Wang, S. T. [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Graduate University of Chinese Academy of Sciences, Beijing 100049 (China); Zhou, X. H.; Zhang, Y. H.; Sun, Z. Y.; Zheng, Y.; Liu, M. L.; Chen, L.; Zhang, N. T.; Hu, J.; Ma, F.; Hua, W.; Guo, S.; Qiang, Y. H.; Ma, L.; Fang, Y. D.; Li, G. S.; Zhou, H. B.; Ding, B.; Wang, H. X.; Lei, X. G. [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China)

2011-09-15T23:59:59.000Z

375

A dual polarized x-band pulse radar for ground based electromagnetic scattering experiment / by Allen William White  

E-Print Network (OSTI)

) 218 219 221 Table C-7 XMTR/RCVR (T/R) Enclosure Wire List (50 - pin D connector) ~pa e 223 LIST OF FIGURES ~Fi ure X-Band Radar Scatterometer ~pa e I-2 Basic Block Diagram of the X-Band Radar Scatterometer X-Band Radar Block Diagram...) Produced by the SPST PIN diode Switch Modulator: fo' = 10. 000 GHz 77 ~Fi ure IV-15 ~pa e Graph of the Output Power Deviation of the CW Gunn Oscillator (Model No. MA 86130) as a Function of Temperature ~ ~ ~ ~ ~ 79 IV-16 V-1 V-2 V-3 V-4 V-5 V...

White, Allen William

2012-06-07T23:59:59.000Z

376

Direct Optical Observation of the Subsidiary X1c Conduction Band and Its Donor Levels in InP  

Science Journals Connector (OSTI)

Zero-phonon and phonon-assisted optical transitions from the ?1c conduction band to the subsidiary X1c conduction band and its donor levels have been observed in InP at 8K. The X1c-?1c interband energy is measured at 9605 meV, and the binding energies of donors associated with the subsidiary X1c band are found to be 106 and 175 meV (5 meV) for Te and Si, respectively.

A. Onton; Y. Yacoby; R. J. Chicotka

1972-04-10T23:59:59.000Z

377

Physical properties and band structure of reactive molecular beam epitaxy grown oxygen engineered HfO{sub 2{+-}x}  

SciTech Connect

We have conducted a detailed thin film growth structure of oxygen engineered monoclinic HfO{sub 2{+-}x} grown by reactive molecular beam epitaxy. The oxidation conditions induce a switching between (111) and (002) texture of hafnium oxide. The band gap of oxygen deficient hafnia decreases with increasing amount of oxygen vacancies by more than 1 eV. For high oxygen vacancy concentrations, defect bands form inside the band gap that induce optical transitions and p-type conductivity. The resistivity changes by several orders of magnitude as a function of oxidation conditions. Oxygen vacancies do not give rise to ferromagnetic behavior.

Hildebrandt, Erwin; Kurian, Jose; Alff, Lambert [Institute of Materials Science, Technische Universitaet Darmstadt, 64287 Darmstadt (Germany)

2012-12-01T23:59:59.000Z

378

Interplay between elastic instabilities and shear-banding: three categories of TaylorCouette flows and beyond  

E-Print Network (OSTI)

In the past twenty years, shear-banding flows have been probed by various techniques, such as rheometry, velocimetry and flow birefringence. In micellar solutions, many of the data collected exhibit unexplained spatiotemporal ...

Fardin, M. A.

379

Interfacial chemical bonding state and band alignment of CaF{sub 2}/hydrogen-terminated diamond heterojunction  

SciTech Connect

CaF{sub 2} films are deposited on hydrogen-terminated diamond (H-diamond) by a radio-frequency sputter-deposition technique at room temperature. Interfacial chemical bonding state and band alignment of CaF{sub 2}/H-diamond heterojunction are investigated by X-ray photoelectron spectroscopy. It is confirmed that there are only C-Ca bonds at the CaF{sub 2}/H-diamond heterointerface. Valence and conductance band offsets of the CaF{sub 2}/H-diamond heterojunciton are determined to be 3.7 {+-} 0.2 and 0.3 {+-} 0.2 eV, respectively. It shows a type I straddling band configuration. The large valence band offset suggests advantage of the CaF{sub 2}/H-diamond heterojunciton for the development of high power and high frequency field effect transistors.

Liu, J. W.; Liao, M. Y.; Cheng, S. H.; Imura, M. [Optical and Electronic Materials Unit, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Koide, Y. [Optical and Electronic Materials Unit, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Nanofabrication Platform, NIMS, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan); Center of Materials Research for Low Carbon Emission (CMRLC), NIMS, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)

2013-03-28T23:59:59.000Z

380

Band structures in {sup 106}Ag and systematics of shears mechanism in the Aapprox110 mass region  

SciTech Connect

High-spin states of {sup 106}Ag were populated via the fusion-evaporation reaction {sup 100}Mo ({sup 11}B,5n){sup 106}Ag at a beam energy of 60 MeV. A rich level scheme with six band structures has been established. A high-K negative-parity band has been identified and assigned to the pig{sub 9/2} x nu[h{sub 11/2}(g{sub 7/2}/d{sub 5/2}){sup 2}] configuration. The positive parity DELTAI=1 band, built on the 12{sup +} state, is discussed in terms of the magnetic rotation model. The systematic study of similar bands in the Aapprox110 mass region indicates that the magnetic rotation phenomenon has, as lower boundary, the Ag isotopes at Z=47.

He, C. Y.; Wu, X. G.; Wen, S. X.; Li, G. S.; Liu, Y.; Wang, Z. M.; Li, X. Q.; Ma, R. G.; Yang, C. X. [China Institute of Atomic Energy, Beijing 102413 (China); Zhu, L. H. [China Institute of Atomic Energy, Beijing 102413 (China); School of Science, Shenzhen University, Shenzhen 518060 (China); Cui, X. Z. [Department of Physics, Jilin University, Changchun 130023 (China); Sun, H. B. [School of Science, Shenzhen University, Shenzhen 518060 (China)

2010-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Study of valence-band intersublevel transitions in InAs/GaAs quantum dots-in-well infrared photodetectors  

E-Print Network (OSTI)

://scitation.aip.org/content/aip/journal/apl/104/17?ver=pdfcov Published by the AIP Publishing Articles you may be interested in An intermediate-band

Matsik, Steven G.

382

On optimizing JacobiDavidson method for calculating eigenvalues in low dimensional structures using eight band k p model  

SciTech Connect

The paper presents two ways of improving the JacobiDavidson method for calculating the eigenvalues and eigenvectors described by eight-band k p model for quantum dots and other low dimensional structures. First, the method is extended by the application of time reversal symmetry operator. This extension allows efficient calculations of the twofold degeneracy present in the multiband k p model and other interior eigenvalues. Second, the preconditioner for the indefinite matrix which comes from the discretization of the eight band k p Hamiltonian is presented. The construction of this preconditioner is based on physical considerations about energy band structure in the k p model. On the basis of two real examples, it is shown that the preconditioner can significantly shorten the time needed to calculate the interior eigenvalues, despite the fact that the memory usage of the preconditioner and Hamiltionian is comparable. Finally, some technical details for implementing the eight band k p Hamiltonian and the eigensolver are provided.

Andrzejewski, Janusz, E-mail: Janusz.Andrzejewski@pwr.wroc.pl

2013-09-15T23:59:59.000Z

383

Stabilization of temperature dependence of band Gap by introducing nitrogen ion into GaInNP alloy  

SciTech Connect

The photoluminescence (PL) spectra of GaInNP are observed to survey the origin of the unique behavior of the band gap caused by incorporating nitrogen ions. The temperature dependence of the PL peak position is carefully analyzed. It is found that the reduction of the temperature alteration owing to the nitrogen incorporation arises from the hybridization between the nitrogen local 3s and 3p orbitals and the conduction band. In the GaInNP and host GaInP with the indium content around 50%, which has a direct band gap slightly lower than an X-valley, the band gap shrinkage with temperature is mediated by an LA phonon at X point.

Emura, Shuichi; Nonoguchi, Shogo; Kim, Kang Min [The Institute of Scientific and Industrial Research, Osaka Univ., Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan)

2013-12-04T23:59:59.000Z

384

Experimentally Based Estimates of Relations between X-Band Radar Signal Attenuation Characteristics and Differential Phase in Rain  

Science Journals Connector (OSTI)

Correcting observed polarimetric radar variables for attenuation and differential attenuation effects in rain is important for meteorological applications involving measurements at attenuating frequencies such as those at X band. The results of ...

Sergey Y. Matrosov; Patrick C. Kennedy; Robert Cifelli

2014-11-01T23:59:59.000Z

385

Defect assistant band alignment transition from staggered to broken gap in mixed As/Sb tunnel field effect transistor heterostructure  

E-Print Network (OSTI)

.3As heterointerface. As a result, the band alignment was converted from staggered gap to broken gap-to-source voltage, VGS. As the SS of a MOSFET is governed by the transport mechanism of thermionic-emission over

Yener, Aylin

386

Electronic structure of Pt based topological Heusler compounds with C1{sub b} structure and 'zero band gap'  

SciTech Connect

Besides of their well-known wide range of properties it was recently shown that many of the heavy Heusler semiconductors with 1:1:1 composition and C1{sub b} structure exhibit a zero band gap behavior and are topological insulators induced by their inverted band structure. In the present study, the electronic structure of the Heusler compounds PtYSb and PtLaBi was investigated by bulk sensitive hard x-ray photoelectron spectroscopy. The measured valence band spectra are clearly resolved and in well agreement to the first-principles calculations of the electronic structure of the compounds. The experimental results give clear evidence for the zero band gap state.

Ouardi, Siham; Shekhar, Chandra; Fecher, Gerhard H.; Kozina, Xeniya; Stryganyuk, Gregory; Felser, Claudia [Institut fuer Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universitaet, D-55099 Mainz (Germany); Ueda, Shigenori; Kobayashi, Keisuke [NIMS Beamline Station at SPring-8, National Institute for Materials Science, Hyogo 679-5148 (Japan)

2011-05-23T23:59:59.000Z

387

Band offsets from two special GaAs-AlxGa1-xAs quantum-well structures  

Science Journals Connector (OSTI)

Half-parabolic quantum wells and two-stepped quantum wells have been grown by molecular-beam epitaxy with the GaAs-AlxGa1-xAs system and investigated by photoluminescence techniques to determine the band offsets at the heterointerfaces. Both structures provide interband transitions that are sensitive to the partitioning of the energy-gap discontinuity ?Eg=?Ec+?Ev between the conduction and valence bands. It is concluded that the data require valence-band offsets ?Ev equal to 38% and 41% of ?Eg for the half-parabolic wells and the two-stepped wells, respectively. These band offsets are therefore in agreement with the trend of other recent determinations.

R. C. Miller; A. C. Gossard; D. A. Kleinman

1985-10-15T23:59:59.000Z

388

Electron Beam Source Molecular Beam Epitaxy of AlxGal?xAs Graded Band Gap Device Structures  

Science Journals Connector (OSTI)

A new method has been developed for the growth of graded band-gap AlxGal?xAs alloys by molecular beam epitaxy which is based upon electron. beam evaporation of the Group III elements ... . The large dynamic respo...

R. J. Malik; A. F. J. Levi; B. F. Levine

1989-01-01T23:59:59.000Z

389

Getting simultaneous red and near-infrared band data from a single digital camera for plant monitoring applications: theoretical and practical study  

E-Print Network (OSTI)

Getting simultaneous red and near-infrared band data from a single digital camera for plant Abstract. Multispectral images, including red and near-infrared bands, have proved efficient for vegetation imaging devices. A methodology is proposed to obtain simultaneously the near-infrared and red bands from

Boyer, Edmond

390

A DUAL-BAND MILLIMETER-WAVE KINETIC INDUCTANCE CAMERA FOR THE IRAM 30 m TELESCOPE  

SciTech Connect

The Neel IRAM KIDs Array (NIKA) is a fully integrated measurement system based on kinetic inductance detectors (KIDs) currently being developed for millimeter wave astronomy. The instrument includes dual-band optics allowing simultaneous imaging at 150 GHz and 220 GHz. The imaging sensors consist of two spatially separated arrays of KIDs. The first array, mounted on the 150 GHz branch, is composed of 144 lumped-element KIDs. The second array (220 GHz) consists of 256 antenna-coupled KIDs. Each of the arrays is sensitive to a single polarization; the band splitting is achieved by using a grid polarizer. The optics and sensors are mounted in a custom dilution cryostat, with an operating temperature of {approx}70 mK. Electronic readout is realized using frequency multiplexing and a transmission line geometry consisting of a coaxial cable connected in series with the sensor array and a low-noise 4 K amplifier. The dual-band NIKA was successfully tested in 2010 October at the Institute for Millimetric Radio Astronomy (IRAM) 30 m telescope at Pico Veleta, Spain, performing in-line with laboratory predictions. An optical NEP was then calculated to be around 2 x 10{sup -16} W Hz{sup -1/2} (at 1 Hz) while under a background loading of approximately 4 pW pixel{sup -1}. This improvement in comparison with a preliminary run (2009) verifies that NIKA is approaching the target sensitivity for photon-noise limited ground-based detectors. Taking advantage of the larger arrays and increased sensitivity, a number of scientifically relevant faint and extended objects were then imaged including the Galactic Center SgrB2 (FIR1), the radio galaxy Cygnus A, and the NGC1068 Seyfert galaxy. These targets were all observed simultaneously in the 150 GHz and 220 GHz atmospheric windows.

Monfardini, A.; Benoit, A.; Bideaud, A.; Swenson, L.; Cruciani, A.; Camus, P.; Hoffmann, C. [Institut Neel, CNRS and Universite Joseph Fourier (UJF), Grenoble F-38042 (France); Desert, F. X. [Institut de Planetologie et d'Astrophysique, UJF and CNRS-INSU, Grenoble F-38041 (France); Doyle, S.; Ade, P.; Mauskopf, P.; Tucker, C. [Cardiff School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA (United Kingdom); Roesch, M.; Leclercq, S.; Schuster, K. F. [Institut de RadioAstronomie Millimetrique (IRAM), Saint Martin d'Heres F-38406 (France); Endo, A. [Kavli Institute of NanoScience, Delft University of Technology, 2628 CJ Delft (Netherlands); Baryshev, A.; Baselmans, J. J. A.; Ferrari, L.; Yates, S. J. C, E-mail: monfardini@grenoble.cnrs.fr [SRON, Netherlands Institute for Space Research, 3584 CA Utrecht and 9700 AV Groningen (Netherlands)

2011-06-01T23:59:59.000Z

391

Multi junction solar cells using band-gap induced cascaded light absorption  

Science Journals Connector (OSTI)

We propose multi junction solar cells using an optical reflection system formed by arranging plural solar cells in decreasing order of their band gaps for achieving cascaded light absorption by their own band gaps: the first solar cell absorbs some light with a photon energy higher than the highest band gap and reflects the residual light with a lower photon energy to the second solar cell. We further propose to use plural batteries for charging electrical power generated by the individual solar cells to overcome the current matching problem in the multi-junction solar cells. We experimentally demonstrated reflection-type multi junction solar cells using commercially available hydrogenated amorphous silicon (a-Si:H) and crystalline silicon (c-Si) solar cells using air mass 1.5 light illumination. A high open circuit voltage of 24.3 V was achieved, which was a sum of 19.3 and 5.0 V for the individual a-Si:H and c-Si solar cells. However, since there was no current matching between the a-Si:H and c-Si solar cells, the a-Si:H?c-Si serially connected solar cell gave a maximum power of 0.057 W, which was lower than 0.063 W, the sum of those for the individual a-Si:H and c-Si solar cells. The method of charging electrical power from individual solar cells is useful to efficiently achieve electrical power from individual a-Si:H and c-Si solar cells in the absence of current matching in multi junction solar cells.

Toshiyuki Sameshima; Hitomi Nomura; Shinya Yoshidomi; Masahiko Hasumi

2014-01-01T23:59:59.000Z

392

MODELING THE NEAR-ULTRAVIOLET BAND OF GK STARS. I. LOCAL THERMODYNAMIC EQUILIBRIUM MODELS  

SciTech Connect

We present a grid of LTE atmospheric models and synthetic spectra that covers the spectral class range from mid-G to mid-K, and luminosity classes from V to III, that is dense in T{sub eff} sampling ({Delta}T {sub eff} = 62.5 K), for stars of solar metallicity and moderately metal-poor scaled solar abundance ([A/H]=0.0 and -0.5). All models have been computed with two choices of atomic line list: (1) the 'big' line lists of Kurucz that best reproduce the broadband solar blue and near-UV f{sub {lambda}} level, and (2) the 'small' lists of Kurucz and Peytremann that provide the best fit to the high-resolution solar blue and near-UV spectrum. We compare our model spectral energy distributions to a sample of stars carefully selected from the large catalog of uniformly re-calibrated spectrophotometry of Burnashev with the goal of determining how the quality of fit varies with stellar parameters, especially in the historically troublesome blue and near-UV bands. We confirm that our models computed with the 'big' line list recover the derived T {sub eff} values of the PHOENIX NextGen grid, but find that the models computed with the 'small' line list provide greater internal self-consistency among different spectral bands, and closer agreement with the empirical T{sub eff} scale of Ramirez and Melendez, but not to the interferometrically derived T{sub eff} values of Baines et al. We find no evidence that the near-UV band discrepancy between models and observations for Arcturus ({alpha} Boo) reported in two works by Short and Hauschildt is pervasive, and that Arcturus may be peculiar in this regard.

Short, C. Ian [Department of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary's University, Halifax, NS B3H 3C3 (Canada); Hauschildt, P. H., E-mail: ishort@ap.smu.c, E-mail: yeti@hs.uni-hamburg.d [Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg (Germany)

2010-08-01T23:59:59.000Z

393

Analytical technique for extracting the eigenvalues of the k?p matrix that represents the band structure of semiconductors  

Science Journals Connector (OSTI)

By introducing the perturbation method for solving nonlinear equations into the band-structure calculations, we manage to extract an analytical expansion for all the roots of the seventh-order secular equation of the k?p matrix that represents the band structure of germanium in terms of the wave vector k in the [100] direction. The technique that we introduce is general and can be applied to any similar physical or mathematical situation.

S. S. Montasser

1990-10-15T23:59:59.000Z

394

Efficient periodic band diagram computation using a finite element method, Arnoldi eigensolver and sparse linear system solver  

E-Print Network (OSTI)

We present here a Finite Element Method devoted to the simulation of 3D periodic structures of arbitrary geometry. The numerical method based on ARPACK and PARDISO libraries, is discussed with the aim of extracting the eigenmodes of periodical structures and thus establishing their frequency band gaps. Simulation parameters and the computational optimization are the focus. Resolution will be used to characterize EBG (Electromagnetic Band Gap) structures, such as plasma rods and metallic cubes.

Garnier, Romain; Pascal, Olivier

2014-01-01T23:59:59.000Z

395

Parasitic signals in the receiving band of the Sub-Harmonic Arc Detection system on JET ICRF Antennas  

SciTech Connect

When testing the SHAD system on JET ICRF antennas, parasitic signals in the detection band (5-20MHz) were detected. We have identified emission from grid breakdown events in the Neutral Beam injectors, and Ion Cyclotron Emission from the plasma. Spurious signals in the band 4-10 MHz are also often observed at the onset of ELM events. Such parasitic signals could complicate the design and operation of SHAD in ICRF systems for fusion devices.

Jacquet, P.; Blackman, T.; Day, I. E.; Graham, M.; Mayoral, M.-L.; Monakhov, I.; Nightingale, M.; Sharapov, S. E. [EURATOM/CCFE Fusion Association, Culham Science Center, Abingdon, 0X14 3DB (United Kingdom); Berger-By, G. [CEA, IRFM, F-l3108 Saint-Paul-lez Durances (France); Bobkov, V. [Max Planck IPP/EURATOM Assoziation, D-85748 Garching (Germany); Durodie, F.; Vrancken, M. [Association EURATOM/Belgium State, LPP-ERM/KMS, B-1000 Brussels (Belgium); Hellsten, T. [Association EURATOM-VR, Fusion Plasma Physics, EES, KTH, Stockholm (Sweden); Laxaaback, M. [Association EURATOM-VR, Fusion Plasma Physics, EES, KTH, Stockholm (Sweden); EFDA-CSU, Culham Science Centre, Abingdon, 0X14 3DB (United Kingdom)

2011-12-23T23:59:59.000Z

396

Anisotropic empty electron-band states at the pseudo-55 Si(111)/Cu interface  

Science Journals Connector (OSTI)

The partial (s-d) density of empty states at the Cu site in the pseudo-55 Si(111)/Cu interface has been investigated by polarization-dependent x-ray absorption spectroscopy at the Cu L2,3 edges. The absorption spectra are strongly dichroic showing a metallic edge in the interface plane and a quasigap in the perpendicular direction. The two-dimensional nature of the electron-band states at the pseudo-55 interface layer is therefore directly probed.

Massimo Sancrotti; Maurizio Sacchi; Oumar Sakho; Giorgio Rossi

1991-07-15T23:59:59.000Z

397

A chip-scale, telecommunications-band frequency conversion interface for quantum emitters  

E-Print Network (OSTI)

We describe a chip-scale frequency conversion interface designed for connecting photons generated by single quantum emitters to the 1550 nm telecommunications band. Four-wave-mixing Bragg scattering in silicon nitride waveguides is used to demonstrate frequency upconversion and downconversion between the 980 nm and 1550 nm wavelength regions, with signal-to-background levels > 10. Finite element simulations and the split-step Fourier method are used to develop waveguide designs that can connect shorter wavelength (637 nm to 852 nm) quantum emitters with 1550 nm. Finally, the conditions for achieving the conversion efficiencies needed for practical demonstrations of frequency conversion of quantum states of light are discussed.

Agha, Imad; Davanco, Marcelo; Srinivasan, Kartik

2013-01-01T23:59:59.000Z

398

A chip-scale, telecommunications-band frequency conversion interface for quantum emitters  

E-Print Network (OSTI)

We describe a chip-scale, telecommunications-band frequency conversion interface designed for low-noise operation at wavelengths desirable for common single photon emitters. Four-wave mixing Bragg scattering in silicon nitride waveguides is used to demonstrate frequency upconversion and downconversion between the 980 nm and 1550 nm wavelength regions, with signal-to-background levels >10 and conversion efficiency of approximately -60 dB at low continuous wave input pump powers (25 % in existing geometries. Finally, we present waveguide designs that can be used to connect shorter wavelength (637 nm to 852 nm) quantum emitters with 1550 nm.

Imad Agha; Serkan Ates; Marcelo Davanco; Kartik Srinivasan

2013-04-21T23:59:59.000Z

399

Optimization towards high density quantum dots for intermediate band solar cells grown by molecular beam epitaxy  

SciTech Connect

We report high density quantum dots (QDs) formation with optimized growth temperature and V/III ratio. At lower growth temperature, QD density is increased, due to smaller surface migration length of In adatoms. With higher V/III, the QD density is higher but it results in large clusters formation and decreases the QD uniformity. The QD solar cell was fabricated and examined. An extended spectral response in contrast to the GaAs reference cell was presented but the external quantum efficiency at energies higher than GaAs band gap is reduced, resulting from the degradation for the emitter above the strained QD layers.

Zhou, D.; Sharma, G.; Fimland, B. O. [Department of Electronics and Telecommunications, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim (Norway); Thomassen, S. F.; Reenaas, T. W. [Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim (Norway)

2010-02-08T23:59:59.000Z

400

An intermediate-band photometric study of the "Globular Cluster" NGC 2419  

E-Print Network (OSTI)

NGC 2419 is one of the remotest star clusters in the Milky Way halo and its exact nature is yet unclear: While it has traits reminiscent of a globular cluster (GC), its large radius and suggestions of an abundance spread have fueled the discussion about its origin in an extragalactic environment, possibly the remnants of the accretion of a dwarf galaxy. Here, we present first results from deep intermediate-band photometry of NGC 2419, which enables us to search for chemical (light element) abundance variations, metallicity spreads, and thus multiple stellar populations through well calibrated Stroemgren indices.

Koch, Andreas; Feltzing, Sofia; Aden, Daniel; Kacharov, Nikolay; Wilkinson, Mark I

2013-01-01T23:59:59.000Z

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401

Electronic band structure imaging of three layer twisted graphene on single crystal Cu(111)  

SciTech Connect

Few layer graphene (FLG) is grown on single crystal Cu(111) by Chemical Vapor Deposition, and the electronic valence band structure is imaged by Angle-Resolved Photo-Emission Spectroscopy. It is found that graphene essentially grows polycrystalline. Three nearly ideal Dirac cones are observed along the Cu ?{sup }K{sup } direction in k-space, attributed to the presence of ?4 twisted three layer graphene with negligible interlayer coupling. The number of layers and the stacking order are compatible with Raman data analysis demonstrating the complementarity of the two techniques for a more accurate characterization of FLG.

Marquez Velasco, J. [National Center for Scientific Research Demokritos, 15310 Athens (Greece) [National Center for Scientific Research Demokritos, 15310 Athens (Greece); Department of Physics, National Technical University of Athens, Athens (Greece); Kelaidis, N.; Xenogiannopoulou, E.; Tsoutsou, D.; Tsipas, P.; Speliotis, Th.; Pilatos, G.; Likodimos, V.; Falaras, P.; Dimoulas, A., E-mail: dimoulas@ims.demokritos.gr [National Center for Scientific Research Demokritos, 15310 Athens (Greece); Raptis, Y. S. [Department of Physics, National Technical University of Athens, Athens (Greece)] [Department of Physics, National Technical University of Athens, Athens (Greece)

2013-11-18T23:59:59.000Z

402

Magnetic dichroism in valence-band x-ray photoemission spectroscopy  

Science Journals Connector (OSTI)

A fully relativistic description of spin-resolved valence-band x-ray photoemission spectroscopy (VB-XPS) of magnetic solids is presented that is based on multiple scattering theory. This approach allows us to investigate possible magnetic dichroism in VB-XPS. As is demonstrated by results for CoxPt1-x, application to disordered alloys is straightforward within the framework of the coherent potential approximation alloy theory. The spin-integrated spectra for unpolarized radiation were found to be in very satisfying agreement with corresponding experimental data. For the spin-resolved spectra a pronounced magnetic circular dichroism is predicted that should be easily observed.

H. Ebert and J. Schwitalla

1997-02-01T23:59:59.000Z

403

Photonic band gaps in three-dimensional network structures with short-range order  

SciTech Connect

We present a systematic study of photonic band gaps (PBGs) in three-dimensional (3D) photonic amorphous structures (PASs) with short-range order. From calculations of the density of optical states (DOS) for PASs with different topologies, we find that tetrahedrally connected dielectric networks produce the largest isotropic PBGs. Local uniformity and tetrahedral order are essential to the formation of PBGs in PASs, in addition to short-range geometric order. This work demonstrates that it is possible to create broad, isotropic PBGs for vector light fields in 3D PASs without long-range order.

Liew, Seng Fatt; Noh, Heeso [Department of Applied Physics, Yale University, New Haven, Connecticut 06511 (United States); Yang, Jin-Kyu [Department of Applied Physics, Yale University, New Haven, Connecticut 06511 (United States); Department of Optical Engineering, Kongju National University, Kongju 314-701 (Korea, Republic of); Schreck, Carl F. [Department of Physics, Yale University, New Haven, Connecticut 06511 (United States); Dufresne, Eric R. [Department of Physics, Yale University, New Haven, Connecticut 06511 (United States); Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06511 (United States); Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06511 (United States); Department of Cell Biology, Yale University, New Haven, Connecticut 06511 (United States); O'Hern, Corey S. [Department of Physics, Yale University, New Haven, Connecticut 06511 (United States); Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06511 (United States); Cao, Hui [Department of Applied Physics, Yale University, New Haven, Connecticut 06511 (United States); Department of Physics, Yale University, New Haven, Connecticut 06511 (United States)

2011-12-15T23:59:59.000Z

404

Intersublevel dephasing in InAs/GaAs quantum dots below the Reststrahlen band  

SciTech Connect

Using transient four-wave mixing in the terahertz range, we have measured the s-p inter-sublevel dephasing time in self-assembled InAs/GaAs quantum dots for transition energies below the Reststrahlen band. Dephasing times of up to 600?ps at a photon energy of 18?meV have been determined. By comparing pump-probe and four-wave mixing measurements, we show that there is no significant influence of any pure dephasing process at low temperature. The linear temperature dependence is consistent with acoustic phonon scattering.

Teich, M., E-mail: m.teich@hzdr.de; Stephan, D. R.; Helm, M. [Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden (Germany) [Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden (Germany); Technische Universitt Dresden, 01062 Dresden (Germany); Winnerl, S.; Schneider, H. [Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden (Germany)] [Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden (Germany); Wilson, L. R. [Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH (United Kingdom)] [Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH (United Kingdom)

2013-12-16T23:59:59.000Z

405

The B$^2\\Pi-$X$^2\\Pi$ electronic origin band of $^{13}$C$_6$H  

E-Print Network (OSTI)

The rotationally resolved spectrum of the B$^2\\Pi-$X$^2\\Pi$ electronic origin band transition of $^{13}$C$_6$H is presented. The spectrum is recorded using cavity ring-down spectroscopy in combination with supersonic plasma jets by discharging a $^{13}$C$_2$H$_2$/He/Ar gas mixture. A detailed analysis of more than a hundred fully-resolved transitions allows for an accurate determination of the spectroscopic parameters for both the ground and electronically excited state of $^{13}$C$_6$H.

Bacalla, Xavier; Salumbides, Edcel J; Haddad, Mohammad Ali; Linnartz, Harold; Ubachs, Wim

2015-01-01T23:59:59.000Z

406

Characterization and calibration of 8-channel E-band heterodyne radiometer system for SST-1 tokamak  

SciTech Connect

An 8-channel E-band heterodyne radiometer system (7486 GHz) is designed, characterized, and calibrated to measure the radial electron temperature profile by measuring Electron Cyclotron Emission spectrum at SST-1 Tokamak. The developed radiometer has a noise equivalent temperature of 1 eV and sensitivity of 5 10{sup 9} V/W. In order to precisely measure the absolute value of electron temperature, a calibration measurement of the radiometer system is performed using hot-cold Dicke switch method, which confirms the system linearity.

Siju, Varsha; Kumar, Dharmendra; Shukla, Praveena; Pathak, S. K. [Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428 (India)] [Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428 (India)

2014-05-15T23:59:59.000Z

407

Dual-etalon cavity ring-down frequency-comb spectroscopy with broad band light source  

DOE Patents (OSTI)

In an embodiment, a dual-etalon cavity-ring-down frequency-comb spectrometer system is described. A broad band light source is split into two beams. One beam travels through a first etalon and a sample under test, while the other beam travels through a second etalon, and the two beams are recombined onto a single detector. If the free spectral ranges ("FSR") of the two etalons are not identical, the interference pattern at the detector will consist of a series of beat frequencies. By monitoring these beat frequencies, optical frequencies where light is absorbed may be determined.

Chandler, David W; Strecker, Kevin E

2014-04-01T23:59:59.000Z

408

Sub-Doppler Stark Spectroscopy in the A?X (1,0) Band of CN  

SciTech Connect

The effect of external electric fields has been measured in hyperfine-resolved sub-Doppler transitions in the A {sup 2}{Pi}-X {sup 2}{Sigma} (1,0) band of the CN radical near 10900 cm{sup -1}. Static electric fields less than 1 kV/cm are sufficient to mix the most closely spaced {Lambda}-dpublets in the A state, leading to Stark spectra with both new and shifted resonances. Simulations of the saturation-dip Stark spectral line profiles allow extraction of the A-state permanent electric dipole moment with a magnitude of 0.06 {+-} 0.02 D.

Hall, G.E.; Hause, M.L.; Sears, T.J.

2009-11-26T23:59:59.000Z

409

Photovoltages Larger than the Band Gap in Thin Films of Germanium  

Science Journals Connector (OSTI)

Photovoltages much larger than the band gap were investigated in thin films of germanium deposited obliquely onto Pyrex substrates. The voltages were studied as functions of angle of deposit film thickness intensity of illumination temperature and ambient atmosphere. A model is presented which explains the following observations. Positive and negative photovoltages exist simultaneously in a single sample; which of these predominates changes with time. Dark resistance and photovoltage exhibit the same temperature dependence with identical activation energies indicating that both dark resistance and photovoltage arise from the same elementary processes.

H. Kallmann; G. Marmor Spruch; S. Trester

1972-01-01T23:59:59.000Z

410

Is it effective to harvest visible light by decreasing the band gap of photocatalytic materials?  

SciTech Connect

In situ variations in the electron work function and photo-current of TiO{sub 2} nanotubes demonstrate that long-wavelength illumination only has a minor effect on the excitation of electrons in the nanotubes after being exposed to short-wavelength light or when the short-wavelength light coexisted, indicating that the solar spectrum may not be utilized as efficiently as expected by extending the absorption spectrum of the photocatalytic material to visible light range with decreased band gaps.

Fu Ning; Tang Xinhu; Li Dongyang [Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2G6 (Canada)

2012-02-27T23:59:59.000Z

411

Direct space-time observation of pulse tunneling in an electromagnetic band gap  

SciTech Connect

We present space-time-resolved measurements of electromagnetic pulses tunneling through a coaxial electromagnetic band gap structure. The results show that during the tunneling process the field distribution inside the barrier is an exponentially decaying standing wave whose amplitude increases and decreases as it slowly follows the temporal evolution of the input pulse. At no time is a pulse maximum found inside the barrier, and hence the transmitted peak is not the incident peak that has propagated to the exit. The results support the quasistatic interpretation of tunneling dynamics and confirm that the group delay is not the traversal time of the input pulse peak.

Doiron, Serge; Hache, Alain [Department de physique et d'astronomie, Universite de Moncton, Moncton, New Brunswick, E1A 3E9 (Canada); Winful, Herbert G. [Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Avenue, Ann Arbor, Michigan 48109-2122 (United States)

2007-08-15T23:59:59.000Z

412

Experimental Investigation of the Effect of M-Band Preheating in Indirectly-Driven Double-Shell Implosions  

SciTech Connect

Experimental results are presented from several series of experiments studying the effect of 2-4 keV M-shell radiation on the implosion of double-shell capsules on the Omega Laser at the Laboratory for Laser Energetics. In the First series of experiments, precision machined double-shell capsules implosions are performed. A discrepancy is observed between the experimentally measured M-band fraction and the simulated value. The application of a time-dependent multiplier to the simulated M-band level results in a decrease in predicted yield of 35% and a corresponding increase in the YoC to 20-35%. In order to further investigate this discrepancy, a series of ''M-Band driven'' targets has been designed. An oversized outer shell is used to preferentially allow the M-band radiation to drive the implosion of a CH-tamped glass inner shell. The inner shell radius-time history is measured and is shown to be consistent with the simulations using the time-dependent M-band multipliers. The spatial distribution of this M-band source is also varied using hohlraums of different length and adjusting the laser pointing accordingly. The resulting asymmetry of the inner shell implosion is diagnosed both by x-ray backlighting prior to shell collision and by core emission.

Robey, H F; Amendt, P A; Park, H-S; Landen, O L; Watt, R G; Varnum, W S

2003-08-22T23:59:59.000Z

413

M-BAND IMAGING OF THE HR 8799 PLANETARY SYSTEM USING AN INNOVATIVE LOCI-BASED BACKGROUND SUBTRACTION TECHNIQUE  

SciTech Connect

Multi-wavelength observations/spectroscopy of exoplanetary atmospheres are the basis of the emerging exciting field of comparative exoplanetology. The HR 8799 planetary system is an ideal laboratory to study our current knowledge gap between massive field brown dwarfs and the cold 5 Gyr old solar system planets. The HR 8799 planets have so far been imaged at J- to L-band, with only upper limits available at M-band. We present here deep high-contrast Keck II adaptive optics M-band observations that show the imaging detection of three of the four currently known HR 8799 planets. Such detections were made possible due to the development of an innovative LOCI-based background subtraction scheme that is three times more efficient than a classical median background subtraction for Keck II AO data, representing a gain in telescope time of up to a factor of nine. These M-band detections extend the broadband photometric coverage out to {approx}5 {mu}m and provide access to the strong CO fundamental absorption band at 4.5 {mu}m. The new M-band photometry shows that the HR 8799 planets are located near the L/T-type dwarf transition, similar to what was found by other studies. We also confirm that the best atmospheric fits are consistent with low surface gravity, dusty, and non-equilibrium CO/CH{sub 4} chemistry models.

Galicher, Raphael; Marois, Christian [National Research Council Canada, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC, V9E 2E7 (Canada); Macintosh, Bruce; Konopacky, Quinn [Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, CA 94550 (United States); Barman, Travis, E-mail: raphael.galicher@nrc-cnrc.gc.ca [Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001 (United States)

2011-10-01T23:59:59.000Z

414

Project Administration and Management (PAM) PAM Progress*  

E-Print Network (OSTI)

, Huron Post-Award Team GCA, FIS, Huron Cash Mgmt Team GCA, FIS, Huron Testing Team FS Huron Conversion Team GCA, OSP, FIS, UIT/ACS, Huron Technical Team UIT/ACS PeopleSoft Grants Team FBS, GCA, OSP FIS, UIT

415

50 MW X-BAND RF SYSTEM FOR A PHOTOINJECTOR TEST STATION AT LLNL  

SciTech Connect

In support of X-band photoinjector development efforts at LLNL, a 50 MW test station is being constructed to investigate structure and photocathode optimization for future upgrades. A SLAC XL-4 klystron capable of generating 50 MW, 1.5 microsecond pulses will be the high power RF source for the system. Timing of the laser pulse on the photocathode with the applied RF field places very stringent requirements on phase jitter and drift. To achieve these requirements, the klystron will be powered by a state of the art, solid-state, high voltage modulator. The 50 MW will be divided between the photoinjector and a traveling wave accelerator section. A high power phase shifter is located between the photoinjector and accelerator section to adjust the phasing of the electron bunches with respect to the accelerating field. A variable attenuator is included on the input of the photoinjector. The distribution system including the various x-band components is being designed and constructed. In this paper, we will present the design, layout, and status of the RF system.

Marsh, R A; Anderson, S G; Barty, C J; Beer, G K; Cross, R R; Ebbers, C A; Gibson, D J; Hartemann, F V; Houck, T L; Adolphsen, C; Candel, A; Chu, T S; Jongewaard, E N; Li, Z; Raubenheimer, T; Tantawi, S G; Vlieks, A; Wang, F; Wang, J W; Zhou, F; Deis, G A

2011-03-11T23:59:59.000Z

416

BUSCA A Telescope Instrumentation for Simultaneous Imaging in 4 Optical Bands  

E-Print Network (OSTI)

The "Bonn University Simultaneous CAmera" (BUSCA) is a CCD camera system which allows simultaneous direct imaging of the same sky area in four colors. The optics are designed for an f/8 beam and four 4Kx4K CCDs with 15m pixels covering a field of view of 12 arcmin x 12 arcmin at a 2m class telescope. In September 1998 BUSCA has seen "First Light". The instrument is based on three dichroic beam splitters which separate optical wavelength bands such (at 430nm, 540nm, 730nm) that standard astronomical intermediate-band filter systems can be used. The dichroics are made of plane-parallel glass plates mounted at an angle of 45 degrees. Astigmatism in the transmitted beams (f/8) is completely cancelled by identical plane-parallel glass plates of suitable orientation. BUSCA offers new perspectives in astronomical multicolor photometry: i) The broadband spectral properties (e.g. color indices) of astronomical objects in the optical can be determined with high reliability even in non-photometric atmospheric conditions...

Reif, K; De Boer, K S; Schmoll, J; Mller, P; Poschmann, H; Klink, G; Kohley, R; Heber, U; Mebold, U; Mueller, Ph.

1999-01-01T23:59:59.000Z

417

Multiple-band reflective polarization converter using U-shaped metamaterial  

SciTech Connect

A multiple-band metamaterial reflective polarization converter (RPC) is proposed, which is composed of the dielectric substrate sandwiched with U-shaped metallic patterns and continuous metal film. The proposed U-shaped metamaterial RPC (UMM-RPC) can convert a linearly polarized wave to its cross polarized wave at the three resonant frequencies, which also can convert the linearly polarized wave to circularly polarized wave at other three resonant frequencies. Furthermore, the proposed UMM-RPC can maintain the same conversional direction at the three resonant frequencies when incident on a circularly polarized wave. The simulated and measured results are in agreement in the entire frequency range, and the polarization conversion ratio is over 90% for both linear and circular polarizations. The surface current distributions of the UMM-RPC are discussed to look into the physical mechanism. The proposed UMM-RPC has simple geometry but more operating frequency bands compared to the previous designs and can be used in applications such as antenna radome, remote sensors, and radiometer.

Huang, Xiaojun [College of Physical Science and Technology, Central China Normal University, Wuhan 430079 (China); Department of Physics, Kashgar Teachers College, Kashgar 844000 (China); Yang, Dong [College of Physics and Electronics Science, Hubei Normal University, Huangshi 435002 (China); Yang, Helin, E-mail: emyang@mail.ccnu.edu.cn [College of Physical Science and Technology, Central China Normal University, Wuhan 430079 (China)

2014-03-14T23:59:59.000Z

418

An AldermanGrant resonator for S-Band Dynamic Nuclear Polarization  

Science Journals Connector (OSTI)

Abstract An AldermanGrant resonator with resonance at 2GHz (S-Band) was simulated, developed and constructed for Dynamic Nuclear Polarization (DNP) experiments at 73mT. The resonator fits into magnet bores with a minimum diameter of 20mm and is compatible with standard 3mm NMR tubes. The compact resonator design achieves good separation of electric and magnetic fields and therefore can be used with comparatively large sample volumes with only small sample heating effects comparable to those obtained with optimized X- and W-Band DNP setups. The saturation efficiency and sample heating effects were investigated for Overhauser DNP experiments of aqueous solutions of TEMPOL radical, showing relative saturation better than 0.9 and sample heating not exceeding a few Kelvin even at high microwave power and long irradiation time. An application is demonstrated, combining the DNP setup with a commercial fast field cycling NMR relaxometer. Using this resonator design at low microwave frequencies can provide DNP polarization for a class of low-field and time-domain NMR experiments and therefore may enable new applications that benefit from increased sensitivity.

Oliver Neudert; Hans-Peter Raich; Carlos Mattea; Siegfried Stapf; Kerstin Mnnemann

2014-01-01T23:59:59.000Z

419

Electron momentum density, band structure, and structural properties of SrS  

SciTech Connect

The electron momentum density, the electronic band structure, and the structural properties of SrS are presented in this paper. The isotropic Compton profile, anisotropies in the directional Compton profiles, the electronic band structure and density of states are calculated using the ab initio periodic linear combination of atomic orbitals method with the CRYSTAL06 code. Structural parameters of SrS-lattice constants and bulk moduli in the B1 and B2 phases-are computed together with the transition pressure. The computed parameters are well in agreement with earlier investigations. To compare the calculated isotropic Compton profile, measurement on polycrystalline SrS is performed using 5Ci-{sup 241}Am Compton spectrometer. Additionally, charge transfer is studied by means of the Compton profiles computed from the ionic model. The nature of bonding in the isovalent SrS and SrO compounds is compared on the basis of equal-valenceelectron-density profiles and the bonding in SrS is found to be more covalent than in SrO.

Sharma, G., E-mail: gsphysics@gmail.com [University of Kota, Department of Pure and Applied Physics (India); Munjal, N.; Vyas, V. [Banasthali University, Department of Physics (India)] [Banasthali University, Department of Physics (India); Kumar, R.; Sharma, B. K. [University of Rajasthan, Department of Physics (India)] [University of Rajasthan, Department of Physics (India); Joshi, K. B. [MLS University, Department of Physics (India)] [MLS University, Department of Physics (India)

2013-10-15T23:59:59.000Z

420

Bright broad-band afterglows of gravitational wave bursts from mergers of binary neutron stars  

E-Print Network (OSTI)

If double neutron star mergers leave behind a massive magnetar rather than a black hole, a bright early afterglow can follow the gravitational wave burst (GWB) even if there is no short gamma-ray burst (SGRB) - GWB association or there is an association but the SGRB does not beam towards earth. Besides directly dissipating the proto-magnetar wind as suggested by Zhang, we here suggest that the magnetar wind could push the ejecta launched during the merger process, and under certain conditions, would reach a relativistic speed. Such a magnetar-powered ejecta, when interacting with the ambient medium, would develop a bright broad-band afterglow due to synchrotron radiation. We study this physical scenario in detail, and present the predicted X-ray, optical and radio light curves for a range of magnetar and ejecta parameters. We show that the X-ray and optical lightcurves usually peak around the magnetar spindown time scale (10^3-10^5s), reaching brightness readily detectable by wide-field X-ray and optical telescopes, and remain detectable for an extended period. The radio afterglow peaks later, but is much brighter than the case without a magnetar energy injection. Therefore, such bright broad-band afterglows, if detected and combined with GWBs in the future, would be a probe of massive millisecond magnetars and stiff equation-of-state for nuclear matter.

He Gao; Xuan Ding; Xue-Feng Wu; Bing Zhang; Zi-Gao Dai

2013-01-03T23:59:59.000Z

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421

Asymmetric fundamental band CO lines as a sign of an embedded giant planet  

E-Print Network (OSTI)

We investigate the formation of double-peaked asymmetric line profiles of CO in the fundamental band spectra emitted by young (1-5Myr) protoplanetary disks hosted by a 0.5-2 Solar mass star. Distortions of the line profiles can be caused by the gravitational perturbation of an embedded giant planet with q=4.7 10^-3 stellar-to-planet mass ratio. Locally isothermal, 2D hydrodynamic simulations show that the disk becomes globally eccentric inside the planetary orbit with stationary ~0.2-0.25 average eccentricity after ~2000 orbital periods. For orbital distances 1-10 AU, the disk eccentricity is peaked inside the region where the fundamental band of CO is thermal excitated. Hence, these lines become a sensitive indicators of the embedded planet via their asymmetries (both in flux and wavelength). We find that the line shape distortions (e.g. distance, central dip, asymmetry and positions of peaks) of a given transition depend on the excitation energy (i.e. on the rotational quantum number J). The magnitude of li...

Regaly, Zs; Kiss, L L

2014-01-01T23:59:59.000Z

422

Nature of the narrow optical band in H*-aggregates: Dozy-chaosexciton coupling  

SciTech Connect

Dozy chaos emerges as a combined effect of the collective chaotic motion of electrons and nuclei, and their chaotic electromagnetic interactions in the transient state of molecules experiencing quantum transitions. Following earlier discussions of the well-known Brnsted relations for proton-transfer reactions; the temperature-dependent electron transfer in LangmuirBlodgett films; the shape of the optical bands of polymethine dye monomers, their dimers, and J-aggregates, this paper reports one more application of the dozy-chaos theory of molecular quantum transitions. The qualitative and quantitative explanations for shape of a narrow and blue-shifted optical absorption band in H{sup *}-aggregates is given on the basis of the dozy-chaos theory by taking into account the dozy-chaosexciton coupling effect. It is emphasized that in the H{sup *}-aggregate chromophore (dimer of cyclic bis-thiacarbocyanines) there is a competition between two Frenkel exciton transitions through the chaotic reorganization motion of nuclear environment. As a result, the highly organized quantum transition to the upper exciton state becomes an exciton-induced source of dozy chaos for the low organized transition to the lower exciton state. This manifests itself in appearing the narrow peak and broad wing in the optical spectrum pattern of H{sup *}-aggregates. A similar enhancement in the H{sup *}-effect caused by the strengthening of the exciton coupling in H{sup *}-dimers, which could be achieved by synthesizing tertiary and quarternary thiacarbocyanine monomers, is predicted.

Egorov, Vladimir V., E-mail: egorov@photonics.ru [Photochemistry Center, Russian Academy of Sciences, Moscow, 119421 (Russian Federation)

2014-07-15T23:59:59.000Z

423

Band-theoretical investigation of the magneto-optical Kerr effect in Fe and Co multilayers  

Science Journals Connector (OSTI)

A band theory of the magneto-optical (MO) properties of solids, based on the first-principles spin-polarized, relativistic linear muffin-tin orbital method, is described. Two expressions of the relativistic electron-photon-interaction matrix elements are implemented and their accuracies are investigated. It is found that the spin-polarized, relativistic band theory, together with the expression of the photon-absorption matrix elements, is able to give reliable optical conductivity and MO Kerr rotation spectra of bcc Fe that agree well with both experiments and recent calculations using a different method. The MO properties of several Fe and Co multilayers [Fe(Co)2Cu6 fcc-(001), FeCu(Ag)5 fcc-(001), bcc-Fe/fcc-Ag5 (001), bcc-Fen/fcc-Au5 (001) (n=1,3), Co2Pd4 fcc-(111), and Co2Ptm fcc-(111) (m=1,4,7)] are then investigated theoretically. The calculated MO Kerr effect in all the multilayers except Co2Pt1 fcc-(111) is not larger than in bulk Fe and Co. Nevertheless, the results suggest that materials with larger Kerr rotations can be achieved by making Fe (Co) superlattices with ultrathin layers (few monolayers thick) of heavy elements possessing a partially filled d band (e.g., Pt and Os).Kerr rotation spectra for Fe(Co)/Cu(Ag, Au, Pd, Pt) bilayers [i.e., a thin layer of Fe (Co) on the Cu (Ag, Au, Pd, Pt) substrate] are also obtained from the calculated optical conductivity tensors of Fe, Co, Cu, Ag, Au, Pd, and Pt. It is found that the MO Kerr effect in the Fe (Co)/noble-metal bilayers is considerably enhanced near the plasma edge of the substrate. This indicates that one can obtain good MO materials by fabricating Fe (Co) bilayers using nonmagnetic metals with a sharp plasma edge (e.g., Ag and Al) as substrates. Calculated Kerr rotation spectra of the Fe and Co multilayers as well as bilayers are in satisfactory agreement with available experiments. The spin and orbital magnetic moments in the Fe and Co multilayers are also calculated, and possible correlations between these and MO properties of the Fe and Co multilayers are discussed.

G. Y. Guo and H. Ebert

1995-05-01T23:59:59.000Z

424

MODELING THE NEAR-UV BAND OF GK STARS. II. NON-LTE MODELS  

SciTech Connect

We present a grid of atmospheric models and synthetic spectral energy distributions (SEDs) for late-type dwarfs and giants of solar and 1/3 solar metallicity with many opacity sources computed in self-consistent non-local thermodynamic equilibrium (NLTE), and compare them to the LTE grid of Short and Hauschildt (Paper I). We describe, for the first time, how the NLTE treatment affects the thermal equilibrium of the atmospheric structure (T({tau}) relation) and the SED as a finely sampled function of T{sub eff}, log g, and [A/H] among solar metallicity and mildly metal-poor red giants. We compare the computed SEDs to the library of observed spectrophotometry described in Paper I across the entire visible band, and in the blue and red regions of the spectrum separately. We find that for the giants of both metallicities, the NLTE models yield best-fit T{sub eff} values that are 30-90 K lower than those provided by LTE models, while providing greater consistency between log g values, and, for Arcturus, T{sub eff} values, fitted separately to the blue and red spectral regions. There is marginal evidence that NLTE models give more consistent best-fit T{sub eff} values between the red and blue bands for earlier spectral classes among the solar metallicity GK giants than they do for the later classes, but no model fits the blue-band spectrum well for any class. For the two dwarf spectral classes that we are able to study, the effect of NLTE on derived parameters is less significant. We compare our derived T{sub eff} values to several other spectroscopic and photometric T{sub eff} calibrations for red giants, including one that is less model dependent based on the infrared flux method (IRFM). We find that the NLTE models provide slightly better agreement to the IRFM calibration among the warmer stars in our sample, while giving approximately the same level of agreement for the cooler stars.

Ian Short, C.; Campbell, Eamonn A. [Department of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary's University, Halifax, NS B3H 3C3 (Canada); Pickup, Heather [Department of Physics and Astronomy, University of Waterloo, Waterloo, ON (Canada); Hauschildt, Peter H., E-mail: ishort@ap.smu.ca, E-mail: yeti@hs.uni-hamburg.de [Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg (Germany)

2012-03-10T23:59:59.000Z

425

The effect of intervalence band absorption on the thermal behavior of InGaAsP lasers  

SciTech Connect

Measurements of intervalence band absorption spectra were made in p-type In /SUB 1/2/ Ga /SUB 1/2/ As, InP, and GaAs. The measured spectra are broader, have less temperature dependencE, and have 2X less peak intensity that theoretical curves predicted by an elementary K X P band model. For P = 10/sup 18/ cm/sup -3/, all three crystals have absorption coefficients of about 13 cm/sup -1/ at 1.3 ..mu..m and 25 cm/sup -1/ at 1.6 ..mu..m. these values of absorption should also be applicable as estimates of interbalence band absorption in quaternary laser material. Because of the low strength and weal temperature dependence of the intervalence band absorption, it should have only a minor effect on the temperature dependence of laser threshold. For example, using their absorption data, the authors calculate that intervalence band absorption will reduce the experimental temperature parameter T /SUB O/ of 1.3 ..mu..m quaternary lasers from 194 to 179 K.

Henry, H.; Logan, R.A.; Luongo, J.P.; Merritt, F.R.

1983-06-01T23:59:59.000Z

426

Laboratory Determination of the Infrared Band Strengths of Pyrene Frozen in Water Ice: Implications for the Composition of Interstellar Ices  

E-Print Network (OSTI)

Broad infrared emission features (e.g., at 3.3, 6.2, 7.7, 8.6, and 11.3 microns) from the gas phase interstellar medium have long been attributed to polycyclic aromatic hydrocarbons (PAHs). A significant portion (10%-20%) of the Milky Way's carbon reservoir is locked in PAH molecules, which makes their characterization integral to our understanding of astrochemistry. In molecular clouds and the dense envelopes and disks of young stellar objects (YSOs), PAHs are expected to be frozen in the icy mantles of dust grains where they should reveal themselves through infrared absorption. To facilitate the search for frozen interstellar PAHs, laboratory experiments were conducted to determine the positions and strengths of the bands of pyrene mixed with H2O and D2O ices. The D2O mixtures are used to measure pyrene bands that are masked by the strong bands of H2O, leading to the first laboratory determination of the band strength for the CH stretching mode of pyrene in water ice near 3.25 microns. Our infrared band str...

Hardegree-Ullman, E E; Boogert, A C A; Lignell, H; Allamandola, L J; Stapelfeldt, K R; Werner, M

2014-01-01T23:59:59.000Z

427

Nanoscale compositional banding in binary thin films produced by ion-assisted deposition  

SciTech Connect

During the ion-assisted deposition of a binary material, the ion beam can induce the formation of nanoscale ripples on the surface of the growing thin film and compositional banding within its bulk. We demonstrate that this remains true even if the curvature dependence of the sputter yields and ballistic mass redistribution are negligible, and the two atomic species are completely miscible. The concentration of the species with the lower of the two sputter yields is higher at the crests of the ripples than at their troughs. Depending on the angles of incidence of the two atomic species, the incident flux of atoms with the higher sputter yield can either stabilize or destabilize the initially flat surface of the thin film.

Mark Bradley, R. [Department of Physics, Colorado State University, Fort Collins, Colorado 80523 (United States)] [Department of Physics, Colorado State University, Fort Collins, Colorado 80523 (United States)

2013-12-14T23:59:59.000Z

428

Energy-band structure and intrinsic coherent properties in two weakly linked Bose-Einstein condensates  

SciTech Connect

The energy-band structure and energy splitting due to quantum tunneling in two weakly linked Bose-Einstein condensates were calculated by using the instanton method. The intrinsic coherent properties of Bose-Josephson junction (BJJ) were investigated in terms of energy splitting. For E{sub C}/E{sub J}<<1, the energy splitting is small and the system is globally phase coherent. In the opposite limit, E{sub C}/E{sub J}>>1, the energy splitting is large and the system becomes phase dissipated. Our results suggest that one should investigate the coherence phenomena of BJJ in proper condition such as E{sub C}/E{sub J}{approx}1.

Li, Wei-Dong; Liang, J.-Q. [Department of Physics and Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, (China); Zhang, Yunbo [Department of Physics and Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, (China); Department of Physics, University of Turku, FIN-20014 Turun yliopisto, (Finland)

2003-06-01T23:59:59.000Z

429

C-Band Scanning ARM Precipitation Radar (C-SAPR) Handbook  

SciTech Connect

The C-band scanning ARM precipitation radar (C-SAPR) is a scanning polarimetric Doppler radar transmitting simultaneously in both H and V polarizations. With a 350-kW magnetron transmitter, this puts 125 kW of transmitted power for each polarization. The receiver for the C-SAPR is a National Center for Atmospheric Research (NCAR) -developed Hi-Q system operating in a coherent-on-receive mode. The ARM Climate Research Facility operates two C-SAPRs; one of them is deployed near the Southern Great Plains (SGP) Central Facility near the triangular array of X-SAPRs, and the second C-SAPR is deployed at ARMs Tropical Western Pacific (TWP) site on Manus Island in Papua New Guinea.

Widener, K; Bharadwaj, N

2012-11-13T23:59:59.000Z

430

Photonic band gap of a graphene-embedded quarter-wave stack  

SciTech Connect

Here, we present a mechanism for tailoring the photonic band structure of a quarter-wave stack without changing its physical periods by embedding conductive sheets. Graphene is utilized and studied as a realistic, two-dimensional conductive sheet. In a graphene-embedded quarter-wave stack, the synergic actions of Bragg scattering and graphene conductance contributions open photonic gaps at the center of the reduced Brillouin zone that are nonexistent in conventional quarter-wave stacks. Such photonic gaps show giant, loss-independent density of optical states at the fixed lower-gap edges, of even-multiple characteristic frequency of the quarter-wave stack. The conductive sheet-induced photonic gaps provide a platform for the enhancement of light-matter interactions.

Fan, Yuancheng [Ames Laboratory; Wei, Zeyong [Tongji University; Li, Hongqiang [Tongji University; Chen, Hong [Tongji University; Soukoulis, Costas M [Ames Laboratory

2013-12-10T23:59:59.000Z

431

Intermediate-band photosensitive device with quantum dots having tunneling barrier embedded in organic matrix  

DOE Patents (OSTI)

A plurality of quantum dots each have a shell. The quantum dots are embedded in an organic matrix. At least the quantum dots and the organic matrix are photoconductive semiconductors. The shell of each quantum dot is arranged as a tunneling barrier to require a charge carrier (an electron or a hole) at a base of the tunneling barrier in the organic matrix to perform quantum mechanical tunneling to reach the respective quantum dot. A first quantum state in each quantum dot is between a lowest unoccupied molecular orbital (LUMO) and a highest occupied molecular orbital (HOMO) of the organic matrix. Wave functions of the first quantum state of the plurality of quantum dots may overlap to form an intermediate band.

Forrest, Stephen R. (Ann Arbor, MI)

2008-08-19T23:59:59.000Z

432

GMR in magnetic multilayers from a first principles band structure Kubo-Greenwood approach  

SciTech Connect

The authors employ the Kubo-Greenwood formula to investigate from first-principles the giant magnetoresistance in Fe{sub m}M{sub n} (M = V, Cr, Mn and Cu) superlattices. The results indicate that MR can arise from band structure changes from ferromagnetic to anti-ferromagnetic alignments. Quantum confinement in the perpendicular direction is induced by the potential steps between the Fe and spacer layers and causes a much larger MR in the current-perpendicular-to-the-plane (CPP) geometry than in the current-in-plane (CIP) geometry. In the presence of the spin-orbit coupling interaction, MR is found to be reduced by spin-channel mixing.

Rao, F.; Freeman, A.J. [Northwestern Univ., Evanston, IL (United States). Dept. of Physics and Astronomy] [Northwestern Univ., Evanston, IL (United States). Dept. of Physics and Astronomy

1998-07-01T23:59:59.000Z

433

Intrinsic surface band bending in Cu{sub 3}N(100) ultrathin films  

SciTech Connect

Highly homogeneous, ultrathin films of copper nitride (Cu{sub 3}N) have been grown on Fe(001) at room temperature using a Cu evaporator and a radio-frequency plasma source to obtain atomic nitrogen in a UHV environment. Cu{sub 3}N is a semiconductor with the valence band edge at -0.65{+-}0.05 eV below the Fermi Level. The formation of copper nitride can be detected spectroscopically by the shape of the Cu LVV-Auger electron transition, which changes sensibly in shape and position compared to metallic Cu. Cu{sub 3}N grows epitaxially with the substrate forming flat disklike mosaic blocks (001) oriented. Both x-ray core level photoelectron spectroscopy and ultraviolet photoelectron spectroscopy photoemission experiments have been used to study the electronic structure. A first-principles calculation has been performed and compared with the measured spectra.

Navio, C.; Alvarez, J.; Yndurain, F.; Miranda, R. [Departamento de Fisica de la Materia Condensada e Instituto de Ciencia de Materiales Nicolas Cabrera, Universidad Autonoma de Madrid, Cantoblanco, 28049 Madrid (Spain); Capitan, M. J. [Instituto de Estructura de la Materia-CSIC, c/Serrano 119, 28006 Madrid (Spain)

2007-08-15T23:59:59.000Z

434

Intermediate-band photosensitive device with quantum dots embedded in energy fence barrier  

DOE Patents (OSTI)

A plurality of layers of a first semiconductor material and a plurality of dots-in-a-fence barriers disposed in a stack between a first electrode and a second electrode. Each dots-in-a-fence barrier consists essentially of a plurality of quantum dots of a second semiconductor material embedded between and in direct contact with two layers of a third semiconductor material. Wave functions of the quantum dots overlap as at least one intermediate band. The layers of the third semiconductor material are arranged as tunneling barriers to require a first electron and/or a first hole in a layer of the first material to perform quantum mechanical tunneling to reach the second material within a respective quantum dot, and to require a second electron and/or a second hole in a layer of the first semiconductor material to perform quantum mechanical tunneling to reach another layer of the first semiconductor material.

Forrest, Stephen R. (Ann Arbor, MI); Wei, Guodan (Ann Arbor, MI)

2010-07-06T23:59:59.000Z

435

Photonic-band-gap effects in two-dimensional polycrystalline and amorphous structures  

SciTech Connect

We study numerically the density of optical states (DOS) in two-dimensional photonic structures with short-range positional order and observe a transition from polycrystalline to amorphous photonic systems. In polycrystals, photonic band gaps (PBGs) are formed within individual domains, which leads to a depletion of the DOS similar to that in periodic structures. In amorphous photonic media, the domain sizes are too small to form PBGs, thus the depletion of the DOS is weakened significantly. The critical domain size that separates the polycrystalline and amorphous regimes is determined by the attenuation length of Bragg scattering, which depends not only on the degree of positional order but also the refractive-index contrast of the photonic material. Even with relatively low-refractive-index contrast, we find that modest short-range positional order in photonic structures enhances light confinement via collective scattering and interference.

Yang, Jin-Kyu; Noh, Heeso; Liew, Seng-Fatt [Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8482 (United States); Schreck, Carl [Department of Physics, Yale University, New Haven, Connecticut 06520-8120 (United States); Guy, Mikhael I. [Science and Research Software Core, Yale University, New Haven, Connecticut 06520-8286 (United States); O'Hern, Corey S. [Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06520-8286 (United States); Department of Physics, Yale University, New Haven, Connecticut 06520-8120 (United States); Cao, Hui [Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8482 (United States); Department of Physics, Yale University, New Haven, Connecticut 06520-8120 (United States)

2010-11-15T23:59:59.000Z

436

Comparison of the Growth of Pore and Shear Band Driven Detonations  

SciTech Connect

The authors examine the effect of ignition site topology on the rate of reaction of a detonating material. The hot plane, hot line, and hot finite patch topologies are added to previous work on hot spot ignition. The hot plane and hot patch ignition forms would arise from ignition due to shear banding, and the hot line ignition form is shown to complete the topological set. The limiting behavior of instantaneous ignition is considered and used to construct simple reaction rate vs. extent of reaction forms. they fit simple form factor reaction rates, as might be available in most hydro codes with reactive flow modes, to the simple topologies. The difference between the rate vs. extent forms are examined with the objective that one should be able to use this information to distinguish between the different topological ignition forms.

Nichols, A L

2010-03-05T23:59:59.000Z

437

KKR-ASA method in exact exchange-potential band-structure calculations  

Science Journals Connector (OSTI)

We present a method of electronic band-structure calculation which incorporates the exact Kohn-Sham density-functional exchange (EXX) potential approach with the Korringa-Kohn-Rostoker (KKR) method in the atomic-sphere approximation (ASA). It takes full account of the energy dependence of the radial functions, and hence, provides more accurate treatment in principle than our previous one based on the linearized muffin-tin orbital method [Phys. Rev. Lett. 74, 2989 (1995)]. In this method, we treat C, Si, Ge, MgO, CaO, and MnO (Antiferro-II), which were previously studied in the framework of the linear-muffin-tin orbital method with EXX. The results are basically in agreement with the old ones, though small differences produce non-negligible effects on the results. Some numerical points as well as the strict formulation of KKR in the ASA are discussed. 1996 The American Physical Society.

Takao Kotani and Hisazumi Akai

1996-12-15T23:59:59.000Z

438

GRB 110721A: PHOTOSPHERE 'DEATH LINE' AND THE PHYSICAL ORIGIN OF THE GRB BAND FUNCTION  

SciTech Connect

The prompt emission spectra of gamma-ray bursts (GRBs) usually have a dominant component that is well described by a phenomenological Band function. The physical origin of this spectral component is debated. Although the traditional interpretation is synchrotron radiation of non-thermal electrons accelerated in internal shocks or magnetic dissipation regions, the growing trend within the community is to interpret this component as modified thermal emission from a dissipative photosphere of a GRB fireball. We analyze the time-dependent spectrum of GRB 110721A detected by the Fermi Gamma-Ray Burst Monitor and Large Area Telescope, and pay special attention to the rapid evolution of the peak energy E{sub p} . We define a 'death line' of thermally dominated dissipative photospheric emission in the E{sub p} -L plane, and show that E{sub p} of GRB 110721A at the earliest epoch has a very high E{sub p} {approx} 15 MeV that is beyond the 'death line'. Together with the finding that an additional 'shoulder' component exists in this burst that is consistent with a photospheric origin, we suggest that at least for some bursts, the Band component is not from a dissipative photosphere, but must invoke a non-thermal origin (e.g., synchrotron or inverse Compton) in the optically thin region of a GRB outflow. We also suggest that the rapid hard-to-soft spectral evolution is consistent with the quick discharge of magnetic energy in a magnetically dominated outflow in the optically thin region.

Zhang Bing; Lu Ruijing; Liang Enwei [Department of Physics and GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004 (China); Wu Xuefeng [Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)

2012-10-20T23:59:59.000Z

439

Precision X-Band Linac Technologies for Nuclear Photonics Gamma-Ray Sources  

SciTech Connect

Nuclear photonics is an emerging field of research requiring new tools, including high spectral brightness, tunable gamma-ray sources; high photon energy, ultrahigh-resolution crystal spectrometers; and novel detectors. This presentation focuses on the precision linac technology required for Compton scattering gamma-ray light sources, and on the optimization of the laser and electron beam pulse format to achieve unprecedented spectral brightness. Within this context, high-gradient X-band technology will be shown to offer optimal performance in a compact package, when used in conjunction with the appropriate pulse format, and photocathode illumination and interaction laser technologies. The nascent field of nuclear photonics is enabled by the recent maturation of new technologies, including high-gradient X-band electron acceleration, robust fiber laser systems, and hyper-dispersion CPA. Recent work has been performed at LLNL to demonstrate isotope-specific detection of shielded materials via NRF using a tunable, quasi-monochromatic Compton scattering gamma-ray source operating between 0.2 MeV and 0.9 MeV photon energy. This technique is called Fluorescence Imaging in the Nuclear Domain with Energetic Radiation (or FINDER). This work has, among other things, demonstrated the detection of {sup 7}Li shielded by Pb, utilizing gamma rays generated by a linac-driven, laser-based Compton scattering gamma-ray source developed at LLNL. Within this context, a new facility is currently under construction at LLNL, with the goal of generating tunable {gamma}-rays in the 0.5-2.5 MeV photon energy range, at a repetition rate of 120 Hz, and with a peak brightness in the 10{sup 20} photons/(s x mm{sup 2} x mrad{sup 2} x 0.1% bw).

Hartemann, F V; Albert, F; Anderson, S G; Bayramian, A J; Cross, R R; Ebbers, C A; Gibson, D J; Houck, T L; Marsh, R A; Messerly, M J; Siders, C W; McNabb, D P; Barty, C J; Adolphsen, C E; Chu, T S; Jongewaard, E N; Tantawi, S G; Vlieks, A E; Wang, F; Wang, J W; Raubenheimer, T O; Ighigeanu, D; Toma, M; Cutoiu, D

2011-08-31T23:59:59.000Z

440

Renormalization group analysis of multi-band many-electron systems at half-filling  

E-Print Network (OSTI)

Renormalization group analysis for multi-band many-electron systems at half-filling at positive temperature is presented. The analysis includes the Matsubara ultra-violet integration and the infrared integration around the zero set of the dispersion relation. The multi-scale integration schemes are implemented in a finite-dimensional Grassmann algebra indexed by discrete position-time variables. In order that the multi-scale integrations are justified inductively, various scale-dependent estimates on Grassmann polynomials are established. We apply these theories in practice to prove that for the half-filled Hubbard model with nearest-neighbor hopping on a square lattice the infinite-volume, zero-temperature limit of the free energy density exists as an analytic function of the coupling constant in a neighborhood of the origin if the system contains the magnetic flux pi (mod 2 pi) per plaquette and 0 (mod 2 pi) through the large circles around the periodic lattice. Combined with Lieb's result on the flux phase problem ([Lieb, E. H., Phys. Rev. Lett. 73 (1994), 2158]), this theorem implies that the minimum free energy density of the flux phase problem converges to an analytic function of the coupling constant in the infinite-volume, zero-temperature limit. The proof of the theorem is based on a four-band formulation of the model Hamiltonian and an extension of Giuliani-Mastropietro's renormalization designed for the half-filled Hubbard model on the honeycomb lattice ([Giuliani, A. and V. Mastropietro, Commun. Math. Phys. 293 (2010), 301-346]).

Yohei Kashima

2014-08-19T23:59:59.000Z

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Comparison of dipole layers, band offsets, and formation enthalpies of GaAs-AlAs(110) and (001) interfaces  

Science Journals Connector (OSTI)

We report a very careful, self-consistent, relativistic pseudopotential calculation of the interfacial dipole double-layer potential, valence-band offset, and formation enthalpy of (GaAs)3(AlAs)3(110). A comparison is made with identical calculations for the (001) superlattice with the following results [(001) in parentheses]: The interfacial dipole layer is 315 (154) meV. The formation enthalpy per twelve-atom unit cell is -21.9 (+1.7) meV. The valence-band offset is 447 (446) meV. This lends credence to the idea that the band offset is a difference of bulk quantities and that vastly different interfaces set up whatever double layer is necessary to maintain that difference.

D. M. Bylander and Leonard Kleinman

1987-11-02T23:59:59.000Z

442

Linear muffin-tin-orbital and k?p calculations of effective masses and band structure of semiconducting diamond  

Science Journals Connector (OSTI)

The electronic structure of semiconducting diamond is calculated by the scalar-relativistic linear muffin-tin-orbital method within the local-density approximation. Information about matrix elements, effective masses, and Luttinger parameters is extracted by comparison with k?p calculations. An extended 1616 k?p calculation is performed using the parameters above as input so as to obtain the detailed band structure of the higher valence and lower conduction band states around the ? point in the (110) direction.

M. Willatzen; M. Cardona; N. E. Christensen

1994-12-15T23:59:59.000Z

443

More insights into band gap graded a-SiGe:H solar cells by experimental and simulated data  

SciTech Connect

An experimental and numerical study of a-SiGe:H based solar cells with band gap graded i-layer in the shape of a V is presented. The variation of the location of the band gap minimum has strong influence on the solar cell performance. Comparisons of experimental and simulated data of the dark IV-behavior, IV-curves under illumination and the quantum efficiency allow insights into the transport and recombination behavior within the solar cell. The simulations reveal that the position as well as the charge state of the defects determine the device characteristics.

Zimmer, J.; Stiebig, H.; Foelsch, J.; Finger, F.; Eickhoff, T.; Wagner, H.

1997-07-01T23:59:59.000Z

444

Mott Insulator-Superfluid Transition in a Generalized Bose-Hubbard Model with Topologically Non-trivial Flat-Band  

E-Print Network (OSTI)

In this paper, we studied a generalized Bose-Hubbard model on a checkerboard lattice with topologically nontrivial flat-band. We used mean-field method to decouple the model Hamiltonian and obtained phase diagram by Landau theory of second-order phase transition. We further calculate the energy gap and the dispersion of quasi-particle or quasi-hole in Mott insulator state and found that in strong interaction limit the quasi-particles or the quasi-holes also have flat bands.

Xing-Hai Zhang; Su-Peng Kou

2012-05-30T23:59:59.000Z

445

Magnetic dichroism in valence-band photoemission spectroscopy of disordered bcc FexCo1-x alloys  

Science Journals Connector (OSTI)

A fully relativistic calculation of spin-resolved valence-band photoemission spectra for bcc FexCo1-x alloys is presented that is based on the Korringa-Kohn-Rostoker coherent-potential approximation method of band-structure calculation. The result for the spin-integrated spectra for unpolarized radiation was found to be in very satisfying agreement with corresponding experimental data. For the spin-resolved spectra a pronounced magnetic circular dichroism is predicted that should be observable in a corresponding experiment.

S. Ostanin and H. Ebert

1998-11-01T23:59:59.000Z

446

Observation of a Rotational Band in the Odd-Z Transfermium Nucleus {sub 101}{sup 251}Md  

SciTech Connect

A rotational band has been unambiguously observed in an odd-proton transfermium nucleus for the first time. An in-beam {gamma}-ray spectroscopic study of {sub 101}{sup 251}Md has been performed using the {gamma}-ray array JUROGAM combined with the gas-filled separator RITU and the focal plane device GREAT. The experimental results, compared to Hartree-Fock-Bogolyubov calculations, lead to the interpretation that the rotational band is built on the [521]1/2{sup -} Nilsson state.

Chatillon, A.; Theisen, Ch.; Bouchez, E.; Clement, E.; Goergen, A.; Huerstel, A.; Korten, W.; Le Coz, Y.; Wilson, J. N. [CEA-SACLAY, DSM/DAPNIA/SPhN, F-91191 Gif-sur-Yvette Cedex (France); Butler, P. A.; Herzberg, R.-D.; Jones, G. D. [Oliver Lodge Laboratory, University of Liverpool, L697ZE (United Kingdom); Dorvaux, O.; Gall, B. J. P.; Khalfallah, F.; Rousseau, M. [Institut Pluridisciplinaire Hubert Curien, F-67037 Strasbourg (France); Eeckhaudt, S.; Grahn, T.; Greenlees, P. T.; Jones, P. [Department of Physics, University of Jyvaeskylae, Fin-40500 (Finland)] (and others)

2007-03-30T23:59:59.000Z

447

Simple band model for La sub 1-x Sr sub x CoO sub 3 : Evidence from electron spectroscopy  

SciTech Connect

Valence band photoelectron spectra and high resolution electron energy loss spectra for La{sub 1-x}Sr{sub x}CoO{sub 3} (x {le} 0.5) have been measured. The general appearance and variation with photon energy of the former may be interpreted in terms of the density of states arising from a simple semiempirical tight binding band structure calculation, for reasonable values of Hamiltonian matrix elements. The latter show a highly damped loss feature below 1 eV which may be assigned to a plasma oscillation whose frequency is overestimated by the same calculations, indicating a considerable enhancement of effective mass through correlation.

Kemp, J.P.; Beal, D.J.; Cox, P.A. (Inorganic Chemistry Laboratory, Oxford (England))

1990-05-01T23:59:59.000Z

448

Thickness-modulated optical dielectric constants and band alignments of HfO{sub x}N{sub y} gate dielectrics  

SciTech Connect

Thickness-modulated optical dielectric constants and band alignments of HfO{sub x}N{sub y} films grown by sputtering have been investigated by spectroscopic ellipsometry (SE) and x-ray photoelectron spectroscopy. Based on SE measurements, it has been noted that an increase in optical dielectric constant and band gap has been observed as a function of the film thickness. Analyses of thickness-dependent band alignment of the HfO{sub x}N{sub y}/Si system indicate that the valence band offset increases, but only slight change in the conduction band offset, resulting from the thickness-induced change in the structure. The suitable optical dielectric constants and band offsets relative to Si make sputtering-derived HfO{sub x}N{sub y} film a promising candidate for high-k gate dielectrics.

He, G.; Zhang, L. D.; Liu, M.; Zhang, J. P.; Wang, X. J. [Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanostructure, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China); Zhen, C. M. [Department of Physics, Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang 050016 (China)

2009-01-01T23:59:59.000Z

449

Efficiency Enhancement InGaP/GaAs Dual-junction Solar Cell by Broad-band and Omnidirectional Antireflection Nanorod Arrays  

Science Journals Connector (OSTI)

10% efficiency enhancement of the solar cell by Broad-band and Omnidirectional Antireflection Nanorod Arrays was demonstrated. The enhanced efficiency attributed to increased light...

Tsai, Min-An; Tseng, P C; Yu, Peichen; Chiu, C H; Kuo, Hao-Chung

450

ARM: W-Band Scanning ARM Cloud Radar (W-SACR) Hemispherical Sky RHI Scans (6 horizon-to-horizon scans at 30-degree azimuth intervals)  

DOE Data Explorer (OSTI)

W-Band Scanning ARM Cloud Radar (W-SACR) Hemispherical Sky RHI Scans (6 horizon-to-horizon scans at 30-degree azimuth intervals)

Widener, Kevin; Nelson, Dan; Bharadwaj, Nitin; Lindenmaier, Iosif [Andrei; Johnson, Karen

451

ARM: Ka-Band Scanning ARM Cloud Radar (KASACR) Hemispherical Sky RHI Scan (6 horizon-to-horizon scans at 30-degree azimuth intervals)  

DOE Data Explorer (OSTI)

Ka-Band Scanning ARM Cloud Radar (KASACR) Hemispherical Sky RHI Scan (6 horizon-to-horizon scans at 30-degree azimuth intervals)

Bharadwaj, Nitin; Widener, Kevin

452

ARM: X-Band Scanning ARM Cloud Radar (XSACR) Hemispherical Sky RHI Scans (6 horizon-to-horizon scans at 30-degree azimuth intervals)  

DOE Data Explorer (OSTI)

X-Band Scanning ARM Cloud Radar (XSACR) Hemispherical Sky RHI Scans (6 horizon-to-horizon scans at 30-degree azimuth intervals)

Widener, Kevin; Nelson, Dan; Bharadwaj, Nitin; Lindenmaier, Iosif [Andrei; Johnson, Karen

453

Effect of nanostructuring on the band structure and the galvanomagnetic properties in Bi{sub 1?x}Sb{sub x} alloys  

SciTech Connect

Magnetotransport measurements were performed on a series of nanostructured Bi{sub 1?x}Sb{sub x} alloy samples with an Sb content in the range between 0% and 60%. The samples were prepared by cold pressing and annealing of crystalline Bi{sub 1?x}Sb{sub x} nanoparticles, which were synthesized by mechanical alloying. The incorporation of Sb changes the band structure of these nanotextured alloys as well as their transport behavior. With increasing Sb content the band gap increases and reaches a maximum band gap of 42?meV at an Sb concentration of about 14% determined from temperature dependent resistivity measurements. For even higher Sb content, the band gap decreases again. The bands and thus the band gaps are shifted with respect to bulk material due to quantum confinement effects in the nanostructures. The change of the band structure with varying Sb content strongly affects the magnetoresistance behavior as well as the magnetic field dependence of the Hall-coefficient. Using a three band model in order to describe both properties, it was possible to determine the main band parameters of the nanostructured material as a function of the Sb content.

Will, C. H.; Elm, M. T., E-mail: matthias.elm@exp1.physik.uni-giessen.de; Klar, P. J. [Institute of Experimental Physics I, Justus-Liebig University, Heinrich-Buff-Ring 16, D-35392 Giessen (Germany); Landschreiber, B.; Gne?, E.; Schlecht, S. [Institute of Inorganic and Analytical Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 58, D-35392 Giessen (Germany)

2013-11-21T23:59:59.000Z

454

Dynamic Time-Variant Connection Management for PGAS Models on InfiniBand  

SciTech Connect

InfiniBand (IB) has established itself as a promising network infrastructure for high-end cluster computing systems as evidenced by its usage in the Top500 supercomputers today. While the IB standard describes multiple communication models (including reliable-connection (RC), and unreliable datagram (UD)), most of its promising features such as remote direct memory access (RDMA), hardware atomics and network fault tolerance are only available for the RC model which requires connections between communicating process pairs. In the past, several researchers have proposed on-demand connection management techniques that establish connections when there is a need to communicate, and not before. While such techniques work well for algorithms and applications that only communicate with a small set of processes in their life-time, there exists a broad set of applications that do not follow this trend. For example, applications that perform dynamic load balancing and adaptive work stealing have a small set of communicating neighbors at any given time, but over time the total number of neighbors can be very high; in some cases, equal to the entire system size. In this paper, we present a dynamic time-variant connection management approach that establishes connections on-demand like previous approaches, but further intelligently tears down some of the unused connections as well. While connection tear-down itself is relevant for any programming model, different models have different complexities. In this paper, we study the Global Arrays (GA) PGAS model for two reasons: (1) the simple one-sided communication primitives provided by GA and other PGAS models ensure that connection requests are always initiated by the origin process without explicit synchronization with the target process---this makes connection tear-down simpler to handle; and (2) GA supports several applications that demonstrate this behavior making it an obvious first target for the proposed enhancements. We evaluate our proposed approach using several micro-benchmarks as well as the NWChem computational chemistry application on more than 6000 processes, and show that our approach can significantly reduce the memory requirements of the communication library while maintaining its performance. To the best of our knowledge, this is the first design, implementation and evaluation of connection tear-down protocols over InfiniBand.

Vishnu, Abhinav; Krishnan, Manoj Kumar; Balaji, Pavan

2011-09-01T23:59:59.000Z

455

Liquid phase epitaxial growth and characterization of germanium far infrared blocked impurity band detectors  

SciTech Connect

Germanium Blocked Impurity Band (BIB) detectors require a high purity blocking layer (< 10{sup 13} cm{sup -3}) approximately 1 mm thick grown on a heavily doped active layer ({approx} 10{sup 16} cm{sup -3}) approximately 20 mm thick. Epilayers were grown using liquid phase epitaxy (LPE) of germanium out of lead solution. The effects of the crystallographic orientation of the germanium substrate on LPE growth modes were explored. Growth was studied on substrates oriented by Laue x-ray diffraction between 0.02{sup o} and 10{sup o} from the {l_brace}111{r_brace} toward the {l_brace}100{r_brace}. Terrace growth was observed, with increasing terrace height for larger misorientation angles. It was found that the purity of the blocking layer was limited by the presence of phosphorus in the lead solvent. Unintentionally doped Ge layers contained {approx}10{sup 15} cm{sup -3} phosphorus as determined by Hall effect measurements and Photothermal Ionization Spectroscopy (PTIS). Lead purification by vacuum distillation and dilution reduced the phosphorus concentration in the layers to {approx} 10{sup 14} cm{sup -3} but further reduction was not observed with successive distillation runs. The graphite distillation and growth components as an additional phosphorus source cannot be ruled out. Antimony ({approx}10{sup 16} cm{sup -3}) was used as a dopant for the active BIB layer. A reduction in the donor binding energy due to impurity banding was observed by variable temperature Hall effect measurements. A BIB detector fabricated from an Sb-doped Ge layer grown on a pure substrate showed a low energy photoconductive onset ({approx}6 meV). Spreading resistance measurements on doped layers revealed a nonuniform dopant distribution with Sb pile-up at the layer surface, which must be removed by chemomechanical polishing. Sb diffusion into the pure substrate was observed by Secondary Ion Mass Spectroscopy (SIMS) for epilayers grown at 650 C. The Sb concentration at the interface dropped by an order of magnitude over {approx} 1.5 {micro}m. Layers grown at 550 C did not show significant Sb diffusion. Sn doped In{sub 2}O{sub 3} (ITO) was studied for use in far infrared transparent low temperature contacts for BIB arrays. It was found that {approx}100 nm of ITO deposited on Ge remains electrically conducting at 4 K and is {approx}90% transparent in the far infrared. ITO should be suitable for passivating contacts to Ge BIB arrays.

Bandaru, Jordana

2001-05-12T23:59:59.000Z

456

Predicting New TiO2 Phases with Low Band Gaps by a Multiobjective Global Optimization Approach  

E-Print Network (OSTI)

stable. This is equivalent to a global optimization problem of a biobjective function, i.e., total energyPredicting New TiO2 Phases with Low Band Gaps by a Multiobjective Global Optimization Approach Hou as a novel global optimization algorithm to predict new polymorphs of bulk TiO2 with better optical

Gong, Xingao

457

Wide-band-gap InAlAs solar cell for an alternative multijunction approach Marina S. Leite,1,a  

E-Print Network (OSTI)

Wide-band-gap InAlAs solar cell for an alternative multijunction approach Marina S. Leite,1,a Robyn L. Woo,2 William D. Hong,2 Daniel C. Law,2 and Harry A. Atwater1 1 California Institute of Technology, 1200 E. California Blvd., Pasadena, California 91125, USA 2 Boeing-Spectrolab Inc., 12500

Atwater, Harry

458

machining parameters showed 5 percent scatter in dimensional instability, but all were within the required tolerance band.  

E-Print Network (OSTI)

instability within 11­20, 21­30 and 31­50 micron tolerance bands in turning precision aero gas turbine engine of Superal- loys as Applied to Gas Turbine,'' M. S. Research thesis, J.N.T.U., Hyderabed. 7 ``Measurement for predicting surface residual stresses, dimensional instability, surface finish and tool life were derived

Endres. William J.

459

Narrow-band search of continuous gravitational-wave signals from Crab and Vela pulsars in Virgo VSR4 data  

E-Print Network (OSTI)

In this paper we present the results of a coherent narrow-band search for continuous gravitational-wave signals from the Crab and Vela pulsars conducted on Virgo VSR4 data. In order to take into account a possible small ...

Aasi, J.

460

A Ka/EHF band geostationary satellite system to provide multimedia services to terrestrial and aeronautical users  

Science Journals Connector (OSTI)

This paper reports on a satellite mobile-multimedia system using both Ka-band and EHF, both for the fixed and the mobile user, which has been defined in Europe to support the UMTS satellite component. The system includes a terrestrial broadband communications ...

Giacinto Losquadro; Michele Luglio; Francesco Vatalaro

1998-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "michigan-tribe-nottawaseppi huron band" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

k?p theory of energy bands, wave functions, and optical selection rules in strained tetrahedral semiconductors  

Science Journals Connector (OSTI)

This paper examines an eight-band k?p theory of strained semiconductors yielding energy bands, wave functions, and momentum matrices. Only if the symmetry of the strained crystal is accounted for in all terms of the Hamiltonian, a consistent definition and calculation of the momentum matrix becomes possible. The band structure and wave functions are nonanalytical functions of strain and crystal momentum. For strained crystals, the extrapolation from the ? point into the Brillouin zone, such as the effective-mass approximation for the optical-matrix elements, can be misleading. For certain cases, the heavy- and light-hole isoenergetic surfaces form complex figures resembling the indicatrix of birefringent biaxial crystals. The symmetry of the hole wave functions causes dichroism for photon energies close to the gap energy, while the crystal becomes optically isotropic for larger photon energies. Numerical results are presented for the eight-band k?p model of biaxially strained bulklike 1.3-?mInxGa1-xAsyP1-y on InP being an important material in optoelectronics.

P. Enders; A. Brwolff; M. Woerner; D. Suisky

1995-06-15T23:59:59.000Z

462

The MAHOROBA Project -- Deep Survey with an Optical Intermediate-Band Filter System on the Subaru Telescope  

E-Print Network (OSTI)

We present a summary of the new optical intermediate-band filter system for the prime-focus camera, Suprime-Cam, on the Subaru telescope at Mauna Kea Observatories. We also discuss a future plan to promote a new deep survey with this filter system (the MAHOROBA project).

Taniguchi, Y

2003-01-01T23:59:59.000Z

463

Band structure engineering of anatase TiO{sub 2} by metal-assisted P-O coupling  

SciTech Connect

In this work, we demonstrate that the metal-assisted P-O coupling is an effective approach to improve the photoelectrochemical properties of TiO{sub 2}. The (Sc + P) and (In + P) codoping effects on electronic structures and photocatalytic activities of anatase TiO{sub 2} are examined by performing hybrid density functional theory calculations. It is found that the coupling of P dopant with the second-nearest neighboring O atom assisted by acceptor metals (Sc/In) leads to the fully occupied and delocalized intermediate bands within the band gap of anatase TiO{sub 2}, which is driven by the P-O antibonding states (?*). This metal-assisted P-O coupling can prevent the recombination of photogenerated electron-hole pairs and effectively reduce the band gap of TiO{sub 2}. Moreover, the band edge alignments in (Sc + P) and (In + P) codoped anatase TiO{sub 2} are desirable for water-splitting. The calculated optical absorption curves indicate that (Sc + P) and (In + P) codoping in anatase TiO{sub 2} can also effectively enhance the visible light absorption.

Wang, Jiajun; Meng, Qiangqiang [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China)] [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); Huang, Jing [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China) [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601 (China); Li, Qunxiang, E-mail: liqun@ustc.edu.cn; Yang, Jinlong [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China) [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China)

2014-05-07T23:59:59.000Z

464

Millimeter-Wave Concurrent Dual-Band BiCMOS RFIC Transmitter for Radar and Communication Systems  

E-Print Network (OSTI)

) ............................................................................................ 128 5.6 Current waveform in the analysis of class A, B, and C PAs ...................... 130 5.7 Maximum efficiency versus conduction angle ........................................... 132 5.8 Main blocks of a concurrent dual-band PA... tuning range (b) ........ 182 6.6 Simulated tunable impulses ........................................................................ 183 xv 6.7 Measured impulse duration versus control voltage .................................... 184 6...

Huynh, Cuong Phu Minh 1976-

2012-11-21T23:59:59.000Z

465

Mesh-free simulations of shear banding in large deformation Shaofan Li, Wei Hao, Wing Kam Liu *  

E-Print Network (OSTI)

Mesh-free simulations of shear banding in large deformation Shaofan Li, Wei Hao, Wing Kam Liu Mesh-free approximation is used in numerical simulations of strain localization under large deformation. An explicit displacement based mesh-free formulation is used in both two-dimensional and three

Li, Shaofan

466

The Case for UHF-Band MU-MIMO Narendra Anand, Ryan E. Guerra, and Edward W. Knightly  

E-Print Network (OSTI)

-user MIMO (MU- MIMO). In this paper we design and implement the first open MU- MIMO Software-Defined Radio-MIMO performance in both outdoor, indoor, line-of-sight (LOS), and non-line-of-sight (NLOS) environ- ments in UHF bands for high spectral efficiency and low-overhead wireless access. Categories and Subject

467

Ethylene adsorbed on Ni(110): An experimental and theoretical determination of the two-dimensional band structure  

Science Journals Connector (OSTI)

We have investigated the saturated ethylene layer on Ni(110) by low-energy electron diffraction (LEED), angle-resolved ultraviolet photoemission spectroscopy (ARUPS), and near-edge x-ray-absorption fine structure (NEXAFS). This layer exhibits a c(24) LEED pattern that corresponds to a structure containing two adsorbates per primitive unit cell. The ethylene molecules are adsorbed with the molecular plane parallel to the surface and the C-C axis preferentially aligned along the [110] direction of the substrate, as is independently determined from the ARUPS and NEXAFS experiments. The two-dimensional (2D) adsorbate band structure is determined from the ARUPS spectra at various photon energies. Except for the ? orbital, all ethylene-derived bands show significant dispersion (up to 2 eV), but no splitting as would be expected for a structure with two molecules per unit cell. The experimentally determined band structure is reproduced in all details by extended-Hckel-theory calculations for an unsupported ethylene layer. The structural model derived from LEED, ARUPS, and NEXAFS is confirmed both by force field and by the 2D band-structure calculations. This indicates that the adsorbate-adsorbate interactions are essentially decoupled from the adsorbate-substrate interaction, that is responsible for the chemisorption bond.

M. Weinelt; W. Huber; P. Zebisch; H.-P. Steinrck; B. Reichert; U. Birkenheuer; N. Rsch

1992-07-15T23:59:59.000Z

468

An Access Etiquette for VeryWide Wireless Bands \\Lambda Rodrigo Garces , J.J. GarciaLunaAceves  

E-Print Network (OSTI)

Alto, CA 94303, USA raphael.rom@eng.sun.com and Department of Electrical Engineering Technion, Israel­64 GHz unlicensed band to allow sys­ tems from different manufacturers with different physical and medium rates currently available to a fixed user through fiber optic cable. How­ ever, equipment may

California at Santa Cruz, University of

469

An Access Etiquette for Very-Wide Wireless Bands Rodrigo Garces , J.J. Garcia-Luna-Aceves  

E-Print Network (OSTI)

Alto, CA 94303, USA raphael.rom@eng.sun.com and Department of Electrical Engineering Technion, Israel," for the ¡£¢ -¤£¥ GHz unlicensed band to allow sys- tems from different manufacturers with different physical and medium. This would extend the data rates currently available to a fixed user through fiber optic cable. How- ever

California at Santa Cruz, University of

470

An Access Etiquette for Very-Wide Wireless Bands Rodrigo Garces , J.J. Garcia-Luna-Aceves  

E-Print Network (OSTI)

, USA raphael.rom@eng.sun.com and Department of Electrical Engineering Technion, Israel Abstract We unlicensed band to allow sys- tems from different manufacturers with different physical and medium rates currently available to a fixed user through fiber optic cable. How- ever, equipment may

Rom, Raphi

471

Smith receives top teaching honors in Spartanburg District 2 Christopher Smith '06, band director at Chesnee Middle School and  

E-Print Network (OSTI)

Smith receives top teaching honors in Spartanburg District 2 Christopher Smith '06, band director Spartanburg School District 2 Teacher of the Year. Smith, initially selected as Chesnee Middle School administrators described Smith as a model teacher who goes far beyond the call of duty. "Chris is extremely

472

Rapid and brief communication: Proposing new methods in low-level vision from the Mach band illusion in retrospect  

Science Journals Connector (OSTI)

A re-scan of the well-known Mach band illusion has led to the proposal of a Bi-Laplacian of Gaussian operation in early vision. Based on this postulate, the human visual system at low-level has been modeled from two approaches that give rise to two new ... Keywords: Brightness-contrast illusions, Disinhibition, Early vision, Edge enhancement, Laplacian

Kuntal Ghosh; Sandip Sarkar; Kamales Bhaumik

2006-04-01T23:59:59.000Z

473

X-AND W-BAND EPR SPECTROSCOPY COMBINED WITH MOLECULAR DYNAMICS SIMULATIONS UNRAVEL THE STRUCTURE AND STRUCTURAL  

E-Print Network (OSTI)

X- AND W-BAND EPR SPECTROSCOPY COMBINED WITH MOLECULAR DYNAMICS SIMULATIONS UNRAVEL THE STRUCTURE (EPR) spectroscopy is combined with molecular dynamics (MD) simulations to study the structure and thus the EPR spectral line shape contain direct information about the secondary and tertiary structure

Steinhoff, Heinz-Jürgen

474

X-Band EPR Spectrometer with Customizable Arbitrary Waveform Generator based on a 1 GHz DAC Board  

E-Print Network (OSTI)

X-Band EPR Spectrometer with Customizable Arbitrary Waveform Generator based on a 1 GHz DAC Board-4120 , Email: songi@chem.ucsb.edu Abstract We present an EPR spectrometer featuring an arbitrary waveform of pulsed electron paramagnetic resonance (EPR) and enable new experiments. It generates shaped X

Martinis, John M.

475

S-Band Dual-Polarization Radar Observations of Winter Storms PATRICK C. KENNEDY AND STEVEN A. RUTLEDGE  

E-Print Network (OSTI)

S-Band Dual-Polarization Radar Observations of Winter Storms PATRICK C. KENNEDY AND STEVEN A­Illinois State Water Survey (CSU­CHILL) system during four significant winter storms in northeastern Colorado. It was found that values of specific differential phase KDP often reached local maxima of ;0.158­0.48 km21

Rutledge, Steven

476

Raindrop Size Distributions and Rain Characteristics in California Coastal Rainfall for Periods with and without a Radar Bright Band  

E-Print Network (OSTI)

S-band profiling radars showed that coastal winter storms in California and Oregon frequently do sites in northern California were revisited in the winter of 2003/04 in this study, which extends significant. Liquid water contents differ very little, however, for the two rain types. Dis- drometer

Yuter, Sandra

477

S-Band Dual Polarization Radar Observations of Winter Storms Patrick C. Kennedy and Steven A. Rutledge  

E-Print Network (OSTI)

1 S-Band Dual Polarization Radar Observations of Winter Storms Patrick C. Kennedy and Steven A wavelength CSU-CHILL system during four significant winter storms in northeastern Colorado. It was found that specific differential phase (KDP) values often reached local maxima of ~0.15 to 0.4o km-1 in an elevated

Rutledge, Steven

478

Absorption of Narrow-Gap HgCdTe Near the Band Edge Including Nonparabolicity and the Urbach Tail  

E-Print Network (OSTI)

Absorption of Narrow-Gap HgCdTe Near the Band Edge Including Nonparabolicity and the Urbach Tail, USA. 6.--e-mail: yonchang@uic.edu An analytical model describing the absorption behavior of Hg1-x. This model smoothly fits experimental absorption coefficients over energies ranging from the Urbach tail

Flatte, Michael E.

479

IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL. 4, 2005 5 A Compact Wide-band EBG Structure Utilizing  

E-Print Network (OSTI)

circuits can provide significant isolation. Transmission line theory developed in [9] is applied to obtainB isolation over 25% bandwidth. The analytical results evaluated based on the transmission line theory the bandgap behavior. To design a compact wide-band EBG, a structure constructed of three layers of ERC, each

Sarabandi, Kamal

480

Near infrared 3~~ overtone band of Hl Brian F. Ventrudo and Daniel T. Cassidy  

E-Print Network (OSTI)

Near infrared 3~~ overtone band of Hl Brian F. Ventrudo and Daniel T. Cassidy Department transitions. Short-external-cavity InCaAsP diodes were used as tunable near infrared radiation sources and understand the spectrum of vibra- tional excited states. This paper updates the list of observed near-infrared

Oka, Takeshi

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481

Building Multirail InfiniBand Clusters: MPI-Level Design and Performance JIUXING LIU, ABHINAV VISHNU AND D. K. PANDA  

E-Print Network (OSTI)

the performance bottleneck for some of today's most demanding applications. In this paper, we study the problem, multiple ports and virtual multirail configuration) of setting up multirail net- works with Infini band- width. £ This research is supported in part by Department of Energy's Grant #DE-FC02-01ER25506

Panda, Dhabaleswar K.

482

A Robust C-Band Hydrometeor Identification Algorithm and Application to a Long-Term Polarimetric Radar Dataset  

E-Print Network (OSTI)

. Application of the new HID to seven seasons of C-POL data reveals that hail and big drops/melting hail occur-Do, South Korea V. CHANDRASEKAR AND M. THURAI Department of Electrical and Computer Engineering, Colorado band is de- veloped from theoretical scattering simulations including wet snow, hail, and big drops

Rutledge, Steven

483

Comparative band alignment of plasma-enhanced atomic layer deposited high-k dielectrics on gallium nitride  

SciTech Connect

Al{sub 2}O{sub 3} films, HfO{sub 2} films, and HfO{sub 2}/Al{sub 2}O{sub 3} stacked structures were deposited on n-type, Ga-face, GaN wafers using plasma-enhanced atomic layer deposition (PEALD). The wafers were first treated with a wet-chemical clean to remove organics and an in-situ combined H{sub 2}/N{sub 2} plasma at 650 Degree-Sign C to remove residual carbon contamination, resulting in a clean, oxygen-terminated surface. This cleaning process produced slightly upward band bending of 0.1 eV. Additional 650 Degree-Sign C annealing after plasma cleaning increased the upward band bending by 0.2 eV. After the initial clean, high-k oxide films were deposited using oxygen PEALD at 140 Degree-Sign C. The valence band and conduction band offsets (VBOs and CBOs) of the Al{sub 2}O{sub 3}/GaN and HfO{sub 2}/GaN structures were deduced from in-situ x-ray and ultraviolet photoemission spectroscopy (XPS and UPS). The valence band offsets were determined to be 1.8 and 1.4 eV, while the deduced conduction band offsets were 1.3 and 1.0 eV, respectively. These values are compared with the theoretical calculations based on the electron affinity model and charge neutrality level model. Moreover, subsequent annealing had little effect on these offsets; however, the GaN band bending did change depending on the annealing and processing. An Al{sub 2}O{sub 3} layer was investigated as an interfacial passivation layer (IPL), which, as results suggest, may lead to improved stability, performance, and reliability of HfO{sub 2}/IPL/GaN structures. The VBOs were {approx}0.1 and 1.3 eV, while the deduced CBOs were 0.6 and 1.1 eV for HfO{sub 2} with respect to Al{sub 2}O{sub 3} and GaN, respectively.

Yang Jialing; Eller, Brianna S.; Zhu Chiyu; England, Chris; Nemanich, Robert J. [Department of Physics, Arizona State University, Tempe, Arizona 85287-1504 (United States)

2012-09-01T23:59:59.000Z

484

Measurement of solid-state optical refrigeration by two-band differential luminescence thermometry  

SciTech Connect

We present a non-contact spectroscopic teclmique for the measurement of laser-induced temperature changes in solids. Two-band differential luminescence thermometry (TBDLT) achieves a sensitivity of {approx}7 mK and enables precise measurement of the net quantum efficiency of optical refrigerator materials. TBDLT detects internal temperature changes by decoupling surface and bulk heating effects via time-resolved luminescence spectroscopy. Several Yb{sup 3+}-doped fluorozirconate (ZBLANI) glasses fabricated from precursors of varying purity and by different processes are analyzed in detail. A net quantum efficiency of 97.39% at 238 K (at a pump wavelength of 1020.5 nm) is found for a ZBLANI:1%Yb{sup 3+} laser-cooling sample produced from metal fluoride precursors that were purified by chelate-assisted solvent extraction and dried in hydrofluoric gas. In comparison, a ZBLANI:1%Yb{sup 3+} sample produced from commercial-grade metal fluoride precursors showed pronounced laser-induced heating that is indicative of a substantially higher impurity concentration. TBDLT enables rapid and sensitive benchmarking of laser-cooling materials and provides critical feedback to the development and optimization of high-performance optical cryocooler materials.

Hehlen, Markus P [Los Alamos National Laboratory; Epstein, Richard I [Los Alamos National Laboratory; Patterson, Wendy M [UNM; Sheik - Bahae, Mansoor [UNM; Seletskiy, D V [UNM

2009-01-01T23:59:59.000Z

485

ADVANCED X-BAND TEST ACCELERATOR FOR HIGH BRIGHTNESS ELECTRON AND GAMMA RAY BEAMS  

SciTech Connect

In support of Compton scattering gamma-ray source efforts at LLNL, a multi-bunch test stand is being developed to investigate accelerator optimization for future upgrades. This test stand will enable work to explore the science and technology paths required to boost the current 10 Hz monoenergetic gamma-ray (MEGa-Ray) technology to an effective repetition rate exceeding 1 kHz, potentially increasing the average gamma-ray brightness by two orders of magnitude. Multiple bunches must be of exceedingly high quality to produce narrow-bandwidth gamma-rays. Modeling efforts will be presented, along with plans for a multi-bunch test stand at LLNL. The test stand will consist of a 5.5 cell X-band rf photoinjector, single accelerator section, and beam diagnostics. The photoinjector will be a high gradient standing wave structure, featuring a dual feed racetrack coupler. The accelerator will increase the electron energy so that the emittance can be measured using quadrupole scanning techniques. Multi-bunch diagnostics will be developed so that the beam quality can be measured and compared with theory. Design will be presented with modeling simulations, and layout plans.

Marsh, R A; Anderson, S G; Barty, C P; Chu, T S; Ebbers, C A; Gibson, D J; Hartemann, F V; Adolphsen, C; Jongewaard, E N; Raubenheimer, T; Tantawi, S G; Vlieks, A E; Wang, J W

2010-05-12T23:59:59.000Z

486

Intermediate-band Surface Photometry of the Edge-on Galaxy NGC 4565  

E-Print Network (OSTI)

We present a deep, 42.79 hr image of the nearby, edge-on galaxy NGC 4565 in the Beijing-Arizona-Taipei-Connecticut (BATC) 6660A band using the large-format CCD system on the 0.6m Schmidt telescope at the Xinglong Station of the National Astronomical Observatories of China (NAOC). we obtain a final image that is calibrated to an accuracy of 0.02 mag in zero point, and for which we can measure galaxy surface brightness to an accuracy of 0.25 mag at a surface brightness at 27.5 mag arcsec^-2 at 6660A, corresponding to a distance of 22 kpc from the center of the disk. The integrated magnitude of NGC4565 in our filter is m6660=8.99 (R magnitude of 9.1) to a surface brightness of 28 mag arcsec-2. We analyze the faint outer parts of this galaxy using a two-dimensional model comprised of three components: an exponential thin disk, an exponential thick disk, and a power-law halo. A total of 12 parameters are included in our model. We determine the best values of our model parameters via 10,000 random initial values, 3...

Wu, H; Deng, Z; Wu, Hong; Burstein, Dave; Deng, Zugan

2002-01-01T23:59:59.000Z

487

Number Counts of GALEX Sources in FUV (1530A) and NUV (2310A) Bands  

E-Print Network (OSTI)

Number Counts of galaxies in two GALEX bands (FUV: 1530A and NUV: 2310A, both in AB magnitudes) are reported. They provide for the first time in the literature homogeneously calibrated number counts of UV galaxies covering continuously a very wide range of UV magnitude (14 -- 23.8). Both the FUV and NUV counts are inconsistent with a non-evolution model, while they are in good agreement with evolution models (essentially luminosity evolution) derived from the high-z UV luminosity functions of Arnouts et al. (2004). It is found that the contribution from galaxies detected by GALEX to the UV background is 0.68+-0.10 nW m-2 sr-1 at 1530A and 0.99+-0.15 nW m-2 sr-1 at 2310A. These are 66+-9% and 44+-6% of the total contributions of galaxies to the the UV background at 1530A, respectively, as estimated using the evolution models. ...

C. Kevin Xu; Jose Donas; Stephane Arnouts; Ted K. Wyder; Mark Seibert; Jorge Iglesias-Paramo; Jeremy Blaizot; Todd Small; Bruno Milliard; David Schiminovich; D. Christopher Martin; Tom A. Barlow; Luciana Bianchi; Yong-Ik Byun; Karl Forster; Peter G. Friedman; Timothy M. Heckman; Patrick N. Jelinsky; Young-Wook Lee; Barry F. Madore; Roger F. Malina; Patrick Morrissey; Susan G. Neff; R. Michael Rich

2004-11-12T23:59:59.000Z

488

Interpretation of blazar SEDs based on broad band quasi-simultaneous observations  

E-Print Network (OSTI)

We study the quasi-simultaneous Spectral Energy Distributions (SED) of 48 LBAS blazars, collected within three months of the Fermi LAT Bright AGN Sample (LBAS) data taking period, combining Fermi and Swift data with radio NIR-Optical and hard-X/gamma-ray data. We have used these SEDs to characterize the peak position and intensity of both the low and the high-energy features of blazar spectra. The results have been used to derive empirical relationships that estimate the position of the two peaks from the broad-band colors (i.e. the radio to optical, alpha_ro, and optical to X-ray, alpha_ox, spectral slopes) and from the gamma-ray spectral index. Our data show that the synchrotron peak frequency is positioned between 10^(12.5) and 10^(14.5) Hz in broad-lined FSRQs and between 10^(13) and 10^(17) Hz in featureless BL Lacertae objects. We find that the gamma-ray spectral slope is strongly correlated with the synchrotron peak energy and with the X-ray spectral index, as expected at first order in synchrotron - i...

Raino', S; Colafrancesco, S; Giommi, P; Tramacere, A

2009-01-01T23:59:59.000Z

489

Broad band turbulent spectra in gamma-ray burst light curves  

E-Print Network (OSTI)

Broad band power density spectra offer a window to understanding turbulent behavior in the emission mechanism and, at the highest frequencies, in the putative inner engines powering long GRBs. We describe a chirp search method which steps aside Fourier analysis for signal detection in the Poisson noise-dominated 2 kHz sampled BeppoSAX light curves. An efficient numerical implementation is described in $O(Nn\\log n)$ operations, where $N$ is the number of chirp templates and $n$ is the length of the light curve time series, suited for embarrassingly parallel processing. For detection of individual chirps of duration $\\tau=1$ s, the method is one order of magnitude more sensitive in SNR than Fourier analysis. The Fourier-chirp spectra of GRB 010408 and GRB 970816 show a continuation of the spectral slope up to 1 kHz of turbulence identified in low frequency Fourier analysis. The same continuation is observed in an ensemble averaged spectrum of 40 bright long GRBs. An outlook on a similar analysis of upcoming gra...

van Putten, Maurice H P M; Frontera, Filippo

2014-01-01T23:59:59.000Z

490

Temperature dependence of the pure rotational band of HD: Interference, widths, and shifts  

Science Journals Connector (OSTI)

The far-infrared pure rotational absorption spectra of gaseous HD and HD-X (X=H2, He, Ne, Ar, Kr, and N2) were measured at 195 and 296 K. Values of the allowed dipole-moment matrix elements, the absolute frequencies, the spectral-line-shape parameters (broadening and frequency-shift coefficients), and the interference parameters, for the first four rotational lines, were deduced from the spectra. Theoretical calculations of the interference parameter a and the linewidths were performed, based, respectively, on the theory developed by Herman, Tipping, and Poll [Phys. Rev. A 20, 2006 (1979)] and a semiclassical theory developed by Robert and Bonamy [D. Robert and J. Bonamy, J. Phys. 40, 923 (1979)]. The induced dipole moments for HD-Ne and HD-N2 were estimated. The analysis includes the present experimental results, together with previous determinations at 77 and 296 K [L. Ulivi, Z. Lu, and G. C. Tabisz, Phys. Rev. A 40, 642 (1989); P. Drakopoulos and G. C. Tabisz, ibid. $bold 36 , 5556 (1987)]. The behavior of the temperature dependence of the collisional interference in the pure rotational band for HD and its mixtures is confirmed to be more complicated than predictions of the intracollisional theory.

Z. Lu; G. C. Tabisz; L. Uli