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1

Regional geophysics, Cenozoic tectonics and geologic resources...  

Open Energy Info (EERE)

and adjoining regions Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings: Regional geophysics, Cenozoic tectonics and geologic resources of...

2

Cascades Geothermal Region | Open Energy Information  

Open Energy Info (EERE)

Cascades Geothermal Region Cascades Geothermal Region Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Cascades Geothermal Region Details Areas (21) Power Plants (0) Projects (3) Techniques (5) Map: {{{Name}}} The Cascade Range is part of a vast mountain chain that extends from British Columbia to northern California and has been volcanically active for ~ 40 million years as a result of the convergence of the of the Juan de Fuca and Pacific plates. Two physiographic sub-provinces make up the Cascade Range; the Western Cascades and the High Cascades on the east. Middle Eocene to early Pliocene (40 - 5 million years) thick mafic lava flows, primarily of andesitic composition are associated with ash flows, tuffs, and silicic intrusive bodies and stocks that decrease in age eastward to the High Cascades. Miocene to Holocene volcanic rocks make up

3

Cascades Geothermal Region | Open Energy Information  

Open Energy Info (EERE)

Cascades Geothermal Region Cascades Geothermal Region (Redirected from Cascades) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Cascades Geothermal Region Details Areas (21) Power Plants (0) Projects (3) Techniques (5) Map: {{{Name}}} The Cascade Range is part of a vast mountain chain that extends from British Columbia to northern California and has been volcanically active for ~ 40 million years as a result of the convergence of the of the Juan de Fuca and Pacific plates. Two physiographic sub-provinces make up the Cascade Range; the Western Cascades and the High Cascades on the east. Middle Eocene to early Pliocene (40 - 5 million years) thick mafic lava flows, primarily of andesitic composition are associated with ash flows, tuffs, and silicic intrusive bodies and stocks that decrease in age

4

Crustal Structure and tectonics of the Imperial Valley Region California |  

Open Energy Info (EERE)

Crustal Structure and tectonics of the Imperial Valley Region California Crustal Structure and tectonics of the Imperial Valley Region California Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Crustal Structure and tectonics of the Imperial Valley Region California Abstract N/A Authors Gary S. Fruis and William M. Kohler Published Journal U. S. GEOLOGICAL SURVEY, 1984 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Crustal Structure and tectonics of the Imperial Valley Region California Citation Gary S. Fruis,William M. Kohler. 1984. Crustal Structure and tectonics of the Imperial Valley Region California. U. S. GEOLOGICAL SURVEY. N/A(N/A):285-297. Retrieved from "http://en.openei.org/w/index.php?title=Crustal_Structure_and_tectonics_of_the_Imperial_Valley_Region_California&oldid=682730"

5

Data Acquisition-Manipulation At Cascades Region (Ingebritsen...  

Open Energy Info (EERE)

Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Data Acquisition-Manipulation At Cascades Region (Ingebritsen & Mariner, 2010) Exploration...

6

Field Mapping At Cascades Region (Ingebritsen & Mariner, 2010) | Open  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Field Mapping At Cascades Region (Ingebritsen & Mariner, 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Field Mapping At Cascades Region (Ingebritsen & Mariner, 2010) Exploration Activity Details Location Cascades Geothermal Region Exploration Technique Field Mapping Activity Date Usefulness not indicated DOE-funding Unknown References S. E. Ingebritsen, R. H. Mariner (2010) Hydrothermal Heat Discharge In The Cascade Range, Northwestern United States Retrieved from "http://en.openei.org/w/index.php?title=Field_Mapping_At_Cascades_Region_(Ingebritsen_%26_Mariner,_2010)&oldid=510730"

7

Active-region designs in quantum cascade lasers  

SciTech Connect (OSTI)

This paper analyses the development of active-region designs in quantum cascade lasers. Active-region designs have been demonstrated to date that employ various radiative transitions (vertical, diagonal, interminiband and interband). The lower laser level is depopulated through nonradiative transitions, such as one- or two-phonon (and even three-phonon) relaxation or bound state {yields} continuum transitions. Advances in active-region designs and energy diagram optimisation in the past few years have led to significant improvements in important characteristics of quantum cascade lasers, such as their output power, emission bandwidth, characteristic temperature and efficiency. (invited paper)

Zasavitskii, I I [P N Lebedev Physical Institute, Russian Academy of Sciences, Moscow (Russian Federation)

2012-10-31T23:59:59.000Z

8

Rates of tectonic and magmatic processes in the North Cascades continental magmatic arc  

E-Print Network [OSTI]

Continental magmatic arcs are among the most dynamic. geologic systems, and documentation of the magmatic, thermal, and tectonic evolution of arcs is essential for understanding the processes of magma generation, ascent ...

Matzel, Jennifer E. Piontek, 1973-

2004-01-01T23:59:59.000Z

9

Isotopic Analysis At Cascades Region (Kennedy & Van Soest, 2007) | Open  

Open Energy Info (EERE)

Analysis At Cascades Region (Kennedy & Van Soest, 2007) Analysis At Cascades Region (Kennedy & Van Soest, 2007) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis-Fluid At Cascades Region (Kennedy & Van Soest, 2007) Exploration Activity Details Location Cascades Geothermal Region Exploration Technique Isotopic Analysis- Fluid Activity Date Usefulness useful regional reconnaissance DOE-funding Unknown Notes The correspondence of helium isotope ratios and active transtensional deformation indicates a deformation-enhanced permeability and that mantle fluids can penetrate the ductile lithosphere, even in regions where there is no substantial magmatism. Superimposed on the regional trend are local, high 3He/4He anomalies indicating hidden magmatic activity and/or deep

10

A quantum cascade laser in a transverse magnetic field. A model of the open triple-barrier active region  

Science Journals Connector (OSTI)

A theory of spectral parameters and active dynamic conductivity of the quantum cascade laser is proposed in the model of a triple-barrier active region of an individual cascade in a transverse magnetic field. In ...

N. V. Tkach; I. V. Boyko; Ju. A. Seti; G. G. Zegrya

2013-06-01T23:59:59.000Z

11

Seismic stratigraphy and salt tectonics along the Sigsbee Escarpment, southeastern Green Canyon region  

E-Print Network [OSTI]

for the degree of MASTER OF SCIENCE December 1986 Major Subject: Geophysics SEISItllC STRATIGHAPHY AND SALT TECTONICS ALONG THE 'ilGSHEL' L'SCARPMENT. SOI. THEASTERX GREEN CANYON RFGION A Thesis ALAN MARK SWIERCZ Approved as to style and content by: Earl... R. Hoskins (Chairman of Committee) Robert J. McCabe (Member) Gr M. arberg (Member) AVilliam R. Bryant ('Member) j~/ Earl R. Hoskins (Head of Department) December 1986 ABSTRAC'T Seismic Stratigraphy and Salt Tectonics along the Sigsbee...

Swiercz, Alan Mark

2012-06-07T23:59:59.000Z

12

Akermanite in the Cascade Slide xenolith and its significance for regional metamorphism in the Adirondacks  

Science Journals Connector (OSTI)

Akermanite (Ak90) coexists with monticellite (Mo92) and wollastonite (Wo99...) in an unusual calc-silicate xenolith in anorthosite at Cascade Slide in the Adirondack Mountains, New York. Experimental results bear...

J. W. Valley; E. J. Essene

1980-01-01T23:59:59.000Z

13

Faulting in the Yucca Mountain region: Critical review and analyses of tectonic data from the central Basin and Range  

SciTech Connect (OSTI)

Yucca Mountain, Nevada, has been proposed as the potential site for a high-level waste (HLW) repository. The tectonic setting of Yucca Mountain presents several potential hazards for a proposed repository, such as potential for earthquake seismicity, fault disruption, basaltic volcanism, magma channeling along pre-existing faults, and faults and fractures that may serve as barriers or conduits for groundwater flow. Characterization of geologic structures and tectonic processes will be necessary to assess compliance with regulatory requirements for the proposed high level waste repository. In this report, we specifically investigate fault slip, seismicity, contemporary stain, and fault-slip potential in the Yucca Mountain region with regard to Key Technical Uncertainties outlined in the License Application Review Plan (Sections 3.2.1.5 through 3.2.1.9 and 3.2.2.8). These investigations center on (i) alternative methods of determining the slip history of the Bare Mountain Fault, (ii) cluster analysis of historic earthquakes, (iii) crustal strain determinations from Global Positioning System measurements, and (iv) three-dimensional slip-tendency analysis. The goal of this work is to assess uncertainties associated with neotectonic data sets critical to the Nuclear Regulatory Commission and the Center for Nuclear Waste Regulatory Analyses` ability to provide prelicensing guidance and perform license application review with respect to the proposed HLW repository at Yucca Mountain.

Ferrill, D.A.; Stirewalt, G.L.; Henderson, D.B.; Stamatakos, J.; Morris, A.P.; Spivey, K.H. [Southwest Research Inst., San Antonio, TX (United States). Center for Nuclear Waste Regulatory Analyses; Wernicke, B.P. [California Inst. of Tech., Pasadena, CA (United States). Div. of Geological and Planetary Sciences

1996-03-01T23:59:59.000Z

14

Regional TectonicsRegional Tectonics Geology 200  

E-Print Network [OSTI]

, WV Thrusting of the Wills Mtn Duplex created open folds to the west.g p p Seneca RocksPlateau Valley · Appalachian Plateau ­ Low and High · Valley and Ridge · Great Valley · Blue Ridge #12;Great High Plateau Low Plateau Valley and Ridge Valley Bl RidBlue Ridge #12;Relief Map #12;Fig. 23.15. Differential erosion

Kammer, Thomas

15

Non-Tectonic | Open Energy Information  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Non-Tectonic Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Non-Tectonic Dictionary.png Non-Tectonic: A region far from any tectonic plate boundaries which is tectonically stable Other definitions:Wikipedia Reegle Tectonic Settings List of tectonic settings known to host modern geothermal systems: Extensional Tectonics Subduction Zone Rift Zone Hot Spot Non-Tectonic Strike-Slip Many geothermal areas may be considered to have no tectonic contribution to the geothermal resource. These areas are thought to have high heat flow resulting from high radiogenic sources beneath the crust, typically located

16

Pulsed quantum-cascade-laser spectroscopy withintermediate-size pulses: application to NH3 in the 10?m region  

Science Journals Connector (OSTI)

Pulsed quantum-cascade-laser spectrometers are usually used to detect atmospheric...3 spectra recorded at low pressure (i.e. in the mbar range), the spectra show typical oscillations after the absorption. The Bee...

B. Grouiez; V. Zeninari; L. Joly; B. Parvitte

2010-08-01T23:59:59.000Z

17

Shear wave splitting in the crust in North China: stress, faults and tectonic implications  

Science Journals Connector (OSTI)

......caution. 3 Tectonics A large tectonic zone, North China (NC), is also a large administrative region...striking WNW outline the large Zhangjiakou-Bohai tectonic...source mechanisms and borehole drilling data suggest that the......

Yuan Gao; Jing Wu; Yoshio Fukao; Yutao Shi; Ailan Zhu

2011-11-01T23:59:59.000Z

18

Salt tectonism and seismic stratigraphy of the Upper Jurassic in the Destin Dome Region, northeastern Gulf of Mexico  

E-Print Network [OSTI]

SALT TECI'ONISM AND SEISMIC STRATIGRAPHY OF THE UPPER JURASSIC IN THE DESTIN DOME REGION, NORTHEASTERN GULF OF MEXICO A Thesis by GRANT MACRAE Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE August 1990 Major Subject: Oceanography SALT TECI'ONISM AND SEISMIC STRATIGRAPHY OF THE UPPER JURASSIC IN THE DESTIN DOME REGION, NORTHEASTERN GULF OF MEXICO A Thesis by GRANT MACRAE Approved...

MacRae, Grant

2012-06-07T23:59:59.000Z

19

Regional tectonics, differential subsidence, and sediment dispersal patterns: implications for sediment flux to the southern South China Sea and regional filling of sedimentary Basins during Pliocene to the Recent time  

E-Print Network [OSTI]

The Nam Con Son, Malay, and West Natuna basins, located offshore of SE Vietnam and Peninsular Malaysia, initially formed during Eocene(?)-Oligocene rifting, and underwent inversion during Miocene time. Following cessation of tectonic activity...

Murray, Mychal Roland

2012-06-07T23:59:59.000Z

20

Terahertz quantum cascade lasers  

Science Journals Connector (OSTI)

...Michael Pepper Terahertz quantum cascade lasers Jerome Faist 1 Lassaad Ajili...developments in terahertz quantum cascade lasers are reviewed. Structures...magnetic confinement| Terahertz quantum cascade lasers. | Recent developments in...

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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

Extraterrestrial Plate Tectonics  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Extraterrestrial Plate Tectonics Extraterrestrial Plate Tectonics Name: Brent Status: student Grade: 6-8 Location: TX Country: USA Date: Spring 2011 Question: Is there plate tectonics on other planets? Replies: The short answer is that scientists really don't know for sure if there has been or is active plate tectonics on other planets in our solar system. NASA scientists have found some evidence of possible plate tectonics on Mars, but some scientists have discounted this information. Similarly, some scientists have suggested that there may have been plate tectonics on Venus, but it is not a well-supported idea. A link to one of the pages about Mars discusses magnetic "striping" similar to that found on Earth: http://science.nasa.gov/science-news/science-at-nasa/1999/ast29apr99_1/gested

22

Conceptualization And Implementation Of A Tectonic Geomorphology Study For  

Open Energy Info (EERE)

Conceptualization And Implementation Of A Tectonic Geomorphology Study For Conceptualization And Implementation Of A Tectonic Geomorphology Study For Geothermal Exploration In The Great Basin, Usa Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Conceptualization And Implementation Of A Tectonic Geomorphology Study For Geothermal Exploration In The Great Basin, USA Details Activities (0) Areas (0) Regions (0) Abstract: Characterization of tectonic extension and extensional faulting in the Great Basin, U.S.A. has been identified as a priority for geothermal exploration. Geomorphometry can be used to characterize extension rates through the quantification of tectonically induced landforms. A number of geomorphometry-based studies, within the context of tectonic geomorphology, have shown the usefulness of this type of analysis in characterizing

23

Property:TectonicSetting | Open Energy Information  

Open Energy Info (EERE)

TectonicSetting TectonicSetting Jump to: navigation, search Property Name TectonicSetting Property Type Page Description Describes tectonic process responsible for development of geothermal resource. This is a property of type Page. Pages using the property "TectonicSetting" Showing 25 pages using this property. (previous 25) (next 25) A Amedee Geothermal Area + Extensional Tectonics + B Beowawe Hot Springs Geothermal Area + Extensional Tectonics + Blue Mountain Geothermal Area + Extensional Tectonics + Brady Hot Springs Geothermal Area + Extensional Tectonics + C Chena Geothermal Area + Non-tectonic (radiogenic) + Coso Geothermal Area + Extensional Tectonics + D Desert Peak Geothermal Area + Extensional Tectonics + Dixie Valley Geothermal Area + Extensional Tectonics +

24

Tectonic Settings | Open Energy Information  

Open Energy Info (EERE)

Tectonic Settings Tectonic Settings Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Tectonic Settings Dictionary.png Tectonic Settings: No definition has been provided for this term. Add a Definition Map showing worldwide plate tectonics(reference: NASA) Plate tectonics - or the large scale movements of Earth's crusts - result in a number of distinct settings. Major tectonic settings that commonly host geothermal systems include subduction zones, rift zones, extensional regimes, and transtensional or strike-slip zones. Hot spots are thought to occur independent of tectonic activity but will be considered a tectonic setting in the context of geothermal areas because they do not fit into any other category. Retrieved from "http://en.openei.org/w/index.php?title=Tectonic_Settings&oldid=600139"

25

Relating Geothermal Resources To Great Basin Tectonics Using Gps | Open  

Open Energy Info (EERE)

Relating Geothermal Resources To Great Basin Tectonics Using Gps Relating Geothermal Resources To Great Basin Tectonics Using Gps Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Relating Geothermal Resources To Great Basin Tectonics Using Gps Details Activities (8) Areas (4) Regions (0) Abstract: The Great Basin is characterized by non-magmatic geothermal fields, which we hypothesize are created, sustained, and controlled by active tectonics. In the Great Basin, GPS-measured rates of tectonic "transtensional" (shear plus dilatational) strain rate is correlated with geothermal well temperatures and the locations of known geothermal fields. This has led to a conceptual model in which non-magmatic geothermal systems are controlled by the style of strain, where shear (strike-slip faulting)

26

Cascade Organic Solar Cells  

Science Journals Connector (OSTI)

Cascade Organic Solar Cells ... Multiple factors control the efficiency of organic solar cells, making it difficult to use single donor or acceptor materials to balance the, often opposing, material properties required to optimize device performance. ... We demonstrate planar organic solar cells consisting of a series of complementary donor materials with cascading exciton energies, incorporated in the following structure: glass/indium-tin-oxide/donor cascade/C60/bathocuproine/Al. ...

Cody W. Schlenker; Vincent S. Barlier; Stephanie W. Chin; Matthew T. Whited; R. Eric McAnally; Stephen R. Forrest; Mark E. Thompson

2011-09-02T23:59:59.000Z

27

Terahertz Quantum Cascade Lasers  

Science Journals Connector (OSTI)

We provide an overview of terahertz quantum cascade lasers based on resonant-phonon depopulation and metal-metal waveguides, including two-phonon resonant-phonon depopulation...

Williams, Benjamin; Kumar, Sushil; Qin, Qi; Lee, Alan Wei Min; Hu, Qing; Reno, John L; Wasilewski, Z R; Liu, H C

28

Earth's Decelerating Tectonic Plates  

SciTech Connect (OSTI)

Space geodetic and oceanic magnetic anomaly constraints on tectonic plate motions are employed to determine a new global map of present-day rates of change of plate velocities. This map shows that Earth's largest plate, the Pacific, is presently decelerating along with several other plates in the Pacific and Indo-Atlantic hemispheres. These plate decelerations contribute to an overall, globally averaged slowdown in tectonic plate speeds. The map of plate decelerations provides new and unique constraints on the dynamics of time-dependent convection in Earth's mantle. We employ a recently developed convection model constrained by seismic, geodynamic and mineral physics data to show that time-dependent changes in mantle buoyancy forces can explain the deceleration of the major plates in the Pacific and Indo-Atlantic hemispheres.

Forte, A M; Moucha, R; Rowley, D B; Quere, S; Mitrovica, J X; Simmons, N A; Grand, S P

2008-08-22T23:59:59.000Z

29

Retrospective salt tectonics  

SciTech Connect (OSTI)

The conceptual breakthroughs in understanding salt tectonics can be recognized by reviewing the history of salt tectonics, which divides naturally into three parts: the pioneering era, the fluid era, and the brittle era. The pioneering era (1856-1933) featured the search for a general hypothesis of salt diapirism, initially dominated by bizarre, erroneous notions of igneous activity, residual islands, in situ crystallization, osmotic pressures, and expansive crystallization. Gradually data from oil exploration constrained speculation. The effects of buoyancy versus orogeny were debated, contact relations were characterized, salt glaciers were discovered, and the concepts of downbuilding and differential loading were proposed as diapiric mechanisms. The fluid era (1933-{approximately}1989) was dominated by the view that salt tectonics resulted from Rayleigh-Taylor instabilities in which a dense fluid overburden having negligible yield strength sinks into a less dense fluid salt layer, displacing it upward. Density contrasts, viscosity contrasts, and dominant wavelengths were emphasized, whereas strength and faulting of the overburden were ignored. During this era, palinspastic reconstructions were attempted; salt upwelling below thin overburdens was recognized; internal structures of mined diapirs were discovered; peripheral sinks, turtle structures, and diapir families were comprehended; flow laws for dry salt were formulated; and contractional belts on divergent margins and allochthonous salt sheets were recognized. The 1970s revealed the basic driving force of salt allochthons, intrasalt minibasins, finite strains in diapirs, the possibility of thermal convection in salt, direct measurement of salt glacial flow stimulated by rainfall, and the internal structure of convecting evaporites and salt glaciers. The 1980`s revealed salt rollers, subtle traps, flow laws for damp salt, salt canopies, and mushroom diapirs.

Jackson, M.P.A. [Univ. of Texas, Austin, TX (United States)

1996-12-31T23:59:59.000Z

30

A Distinction Technique Between Volcanic And Tectonic Depression Structures  

Open Energy Info (EERE)

Distinction Technique Between Volcanic And Tectonic Depression Structures Distinction Technique Between Volcanic And Tectonic Depression Structures Based On The Restoration Modeling Of Gravity Anomaly- A Case Study Of The Hohi Volcanic Zone, Central Kyushu, Japan Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: A Distinction Technique Between Volcanic And Tectonic Depression Structures Based On The Restoration Modeling Of Gravity Anomaly- A Case Study Of The Hohi Volcanic Zone, Central Kyushu, Japan Details Activities (0) Areas (0) Regions (0) Abstract: In this study, we propose a numerical modeling technique which restores the gravity anomaly of tectonic origin and identifies the gravity low of caldera origin. The identification is performed just by comparing the restored gravity anomalies with the observed gravity anomalies, thus we

31

Terahertz quantum cascade lasers  

E-Print Network [OSTI]

The development of the terahertz frequency range has long been impeded by the relative dearth of compact, coherent radiation sources of reasonable power. This thesis details the development of quantum cascade lasers (QCLs) ...

Williams, Benjamin S. (Benjamin Stanford), 1974-

2003-01-01T23:59:59.000Z

32

Tectonic history from vitrinite reflectance  

Science Journals Connector (OSTI)

......36, 93-112. Diesel C. F. K. , Brothers...undergo the tectonic cycle of subsidence, quiescence...During this tectonic cycle, the geothermal gradient...equal to G. As a general rule, the vitrinite...the Atlantic Ocean, Diesel, C. F. K., Brothers......

M. F. Middleton

1982-01-01T23:59:59.000Z

33

Structure and tectonics of the Sumatra Fault Zone-Sundra Trench junction  

E-Print Network [OSTI]

. The objective of this study is to determine the structures of the Sunda Strait forearm region, the south - southeast continuation of the Sumatra Fault, and model the tectonic development. All available geophysical data for the Sunda Strait forearm region have...

Handayani, Lina

2012-06-07T23:59:59.000Z

34

Extensional Tectonics | Open Energy Information  

Open Energy Info (EERE)

Extensional Tectonics Extensional Tectonics Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Extensional Tectonics Dictionary.png Extensional Tectonics: No definition has been provided for this term. Add a Definition Crustal extension results in horst and graben topography (reference: geologycafe.com) Crustal extension (or lithospheric extension) results in a thinning of the crust, bringing the Earth's surface closer to the hot mantle which increases heat flow. This high heat flow often results in moderate temperature (190-230°C) geothermal resources. Extensional zones are exemplified by horst and graben structures such as those found in the Basin & Range province of the US. Retrieved from "http://en.openei.org/w/index.php?title=Extensional_Tectonics&oldid=599244"

35

Tectonic setting of the Coso geothermal reservoir | Open Energy Information  

Open Energy Info (EERE)

Tectonic setting of the Coso geothermal reservoir Tectonic setting of the Coso geothermal reservoir Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Tectonic setting of the Coso geothermal reservoir Details Activities (1) Areas (1) Regions (0) Abstract: The Coso geothermal reservoir is being developed in Sierran-type crystalline bedrock of the Coso Mountains, a small desert mountain range just to the east of the Sierra Nevada and Rose Valley, which is the southern extension of the Owens Valley of eastern California Optimum development of this reservoir requires an understanding of the fracture hydrology of the Coso Mountains crystalline terrain and its hydrologic connection to regional groundwater and thermal sources. An interpreted, conceptually balanced regional cross section that extends from the Sierra

36

Tunable External Cavity Interband Cascade Laser A. N. Chryssis, M. Dagenais  

E-Print Network [OSTI]

region with a tuning range of 300nm (208 cm-1 ). For comparison, a tunable quantum cascade laserTunable External Cavity Interband Cascade Laser A. N. Chryssis, M. Dagenais Photonics Switching be operated at TEC compatible temperatures. Interband Cascade (IC) lasers[2] , have shown exceptional

Dagenais, Mario

37

Colliding cascades model for earthquake prediction  

E-Print Network [OSTI]

cascades: a direct cascade of loading, which is applied to the top (largest) ... on a direct cascade that would deliver energy from the largest ...... Forest fires: an.

2000-10-12T23:59:59.000Z

38

Origin of InGaN/GaN light-emitting diode efficiency improvements using tunnel-junction-cascaded active regions  

SciTech Connect (OSTI)

This Letter investigates the efficiency enhancement achieved by tunnel junction insertion into the InGaN/GaN multi-quantum well (MQW) active region of blue light emitting diodes (LEDs). The peak quantum efficiency of such LED exceeds 100%, but the maximum wall-plug efficiency (WPE) hardly changes. However, due to the increased bias, the WPE peaks at much higher input power, i.e., the WPE droop is significantly delayed, and the output power is strongly enhanced. The main physical reason for this improvement lies in the non-uniform vertical carrier distribution typically observed within InGaN MQWs.

Piprek, Joachim, E-mail: piprek@nusod.org [NUSOD Institute LLC, P.O. Box 7204, Newark, Delaware 19714 (United States)

2014-02-03T23:59:59.000Z

39

Quantum dot cascade laser  

Science Journals Connector (OSTI)

We demonstrated an unambiguous quantum dot cascade laser based on InGaAs/GaAs/InAs/InAlAs heterostructure by making use of self-assembled quantum dots in the Stranski-Krastanow growth mode...??~?6.15?m and a bro...

Ning Zhuo; Feng Qi Liu; Jin Chuan Zhang; Li Jun Wang

2014-03-01T23:59:59.000Z

40

Structure, tectonics and stress field of the Coso Range, Inyo County,  

Open Energy Info (EERE)

tectonics and stress field of the Coso Range, Inyo County, tectonics and stress field of the Coso Range, Inyo County, California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Structure, tectonics and stress field of the Coso Range, Inyo County, California Details Activities (1) Areas (1) Regions (0) Abstract: The tectonics of the Coso Range has been described as having arcuate and ring faults both suggesting the presence of a circumscribed subsidence bowl or calderalike feature. New information suggests the Coso Range is situated in an area of transition between the stress of the right slip San Andreas fault-plate interaction and the extensional tectonics of the Basin and Range. Arcuate faults in the Coso Range are interpreted to have been produced by the regional stress field rather than to have been of

Note: This page contains sample records for the topic "region cascades tectonic" 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.


41

An Expert System For The Tectonic Characterization Of Ancient Volcanic  

Open Energy Info (EERE)

System For The Tectonic Characterization Of Ancient Volcanic System For The Tectonic Characterization Of Ancient Volcanic Rocks Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: An Expert System For The Tectonic Characterization Of Ancient Volcanic Rocks Details Activities (0) Areas (0) Regions (0) Abstract: The expert system approach enables geochemical evidence to be integrated with geological, petrological and mineralogical evidence in identifying the eruptive setting of ancient volcanic rocks. This paper explains the development of ESCORT, an Expert System for Characterization of Rock Types. ESCORT uses as its knowledge base a set of dispersion matrices derived from a geochemical data bank of some 8000 immobile element analyses, together with tables of magma-type membership probabilities based

42

Alpine Extensional Detachment Tectonics In The Grande Kabylie Metamorphic  

Open Energy Info (EERE)

Extensional Detachment Tectonics In The Grande Kabylie Metamorphic Extensional Detachment Tectonics In The Grande Kabylie Metamorphic Core Complex Of The Maghrebides (Northern Algeria) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Alpine Extensional Detachment Tectonics In The Grande Kabylie Metamorphic Core Complex Of The Maghrebides (Northern Algeria) Details Activities (0) Areas (0) Regions (0) Abstract: The Maghrebides are part of the peri-Mediterranean Alpine orogen. They expose in their inner zone inliers of high-grade crystalline rocks surrounded by Oligo-Miocene and younger Miocene cover. Detailed mapping coupled with structural and petrological investigations in the Grande Kabylie massif, and the reinterpretation of the available geochronological data, allow us to refute the traditional concept of rigid behaviour of this

43

Electroluminescence of quantum-dash-based quantum cascade laser structures  

SciTech Connect (OSTI)

We developed two mid-infrared quantum cascade structures based on InAs quantum dashes. The dashes were embedded either in AlInGaAs lattice-matched to InP or in tensile-strained AlInAs. The devices emit between 7 and 11 {mu}m and are a step forward in the development of quantum cascade lasers based on 3-D confined active regions.

Liverini, V.; Bismuto, A.; Nevou, L.; Beck, M.; Faist, J. [Institute of Quantum Electronics, ETH Zurich, 8092 (Switzerland); Wolfgang-Pauli-Str. 16, HPT F 11, Zurich, CH-8093 (Switzerland)

2011-12-23T23:59:59.000Z

44

TECTONIC VERSUS VOLCANIC ORIGIN OF THE SUMMIT DEPRESSION AT MEDICINE LAKE VOLCANO, CALIFORNIA  

SciTech Connect (OSTI)

Medicine Lake Volcano is a Quaternary shield volcano located in a tectonically complex and active zone at the transition between the Basin and Range Province and the Cascade Range of the Pacific Province. The volcano is topped by a 7x12 km elliptical depression surrounded by a discontinuous constructional ring of basaltic to rhyolitic lava flows. This thesis explores the possibility that the depression may have formed due to regional extension (rift basin) or dextral shear (pull-apart basin) rather than through caldera collapse and examines the relationship between regional tectonics and localized volcanism. Existing data consisting of temperature and magnetotelluric surveys, alteration mineral studies, and core logging were compiled and supplemented with additional core logging, field observations, and fault striae studies in paleomagnetically oriented core samples. These results were then synthesized with regional fault data from existing maps and databases. Faulting patterns near the caldera, extension directions derived from fault striae P and T axes, and three-dimensional temperature and alteration mineral models are consistent with slip across arcuate ring faults related to magma chamber deflation during flank eruptions and/or a pyroclastic eruption at about 180 ka. These results are not consistent with a rift or pull-apart basin. Limited subsidence can be attributed to the relatively small volume of ash-flow tuff released by the only known major pyroclastic eruption and is inconsistent with the observed topographic relief. The additional relief can be explained by constructional volcanism. Striae from unoriented and oriented core, augmented by striae measurements in outcrop suggest that Walker Lane dextral shear, which can be reasonably projected from the southeast, has probably propagated into the Medicine Lake area. Most volcanic vents across Medicine Lake Volcano strike north-south, suggesting they are controlled by crustal weakness related to Basin and Range extension. Interaction of dextral shear, Basin and Range extension, and the zone of crustal weakness expressed as the Mount Shasta-Medicine Lake volcanic highland controlled the location and initiation of Medicine Lake Volcano at about 500 ka.

Mark Leon Gwynn

2010-05-01T23:59:59.000Z

45

Tectonic versus volcanic origin of the summit depression at Medicine Lake Volcano, California  

SciTech Connect (OSTI)

Medicine Lake Volcano is a Quaternary shield volcano located in a tectonically complex and active zone at the transition between the Basin and Range Province and the Cascade Range of the Pacific Province. The volcano is topped by a 7x12 km elliptical depression surrounded by a discontinuous constructional ring of basaltic to rhyolitic lava flows. This thesis explores the possibility that the depression may have formed due to regional extension (rift basin) or dextral shear (pull-apart basin) rather than through caldera collapse and examines the relationship between regional tectonics and localized volcanism. Existing data consisting of temperature and magnetotelluric surveys, alteration mineral studies, and core logging were compiled and supplemented with additional core logging, field observations, and fault striae studies in paleomagnetically oriented core samples. These results were then synthesized with regional fault data from existing maps and databases. Faulting patterns near the caldera, extension directions derived from fault striae P and T axes, and three-dimensional temperature and alteration mineral models are consistent with slip across arcuate ring faults related to magma chamber deflation during flank eruptions and/or a pyroclastic eruption at about 180 ka. These results are not consistent with a rift or pull-apart basin. Limited subsidence can be attributed to the relatively small volume of ash-flow tuff released by the only known major pyroclastic eruption and is inconsistent with the observed topographic relief. The additional relief can be explained by constructional volcanism. Striae from unoriented and oriented core, augmented by striae measurements in outcrop suggest that Walker Lane dextral shear, which can be reasonably projected from the southeast, has probably propagated into the Medicine Lake area. Most volcanic vents across Medicine Lake Volcano strike north-south, suggesting they are controlled by crustal weakness related to Basin and Range extension. Interaction of dextral shear, Basin and Range extension, and the zone of crustal weakness expressed as the Mount Shasta-Medicine Lake volcanic highland controlled the location and initiation of Medicine Lake Volcano at about 500 ka.

Mark Leon Gwynn

2010-05-01T23:59:59.000Z

46

Plasmonic Quantum Cascade Laser Antenna  

Science Journals Connector (OSTI)

We demonstrate the plasmonic quantum cascade laser antenna, that can confine mid-infrared radiation beyond the diffraction limit, by integrating gold optical antennas on the laser...

Yu, Nanfang; Cubukcu, Ertugrul; Diehl, Laurent; Crozier, Kenneth; Capasso, Federico

47

Superlattice cascade solar cell  

SciTech Connect (OSTI)

This paper reports progress toward realization of a new cascade solar cell structure whose chief advantages over other present concepts are: use of silicon for the substrate and low bandgap cell; avoidance of the necessity of lattice matching; and incorporation of a GaAs/GaP superlattice to enhance efficiency and provide a low-resistance connecting junction. Details of the design and operation of an OMCVD system for growing this structure are presented. Results of experiments to optimize layer thickness, compositional uniformity, and surface morphology are described.

Wanlass, M.W.; Blakeslee, A.E.

1982-09-01T23:59:59.000Z

48

The Wacky Wonderful World of Cordilleran Tectonics Event Timing Description  

E-Print Network [OSTI]

-style volcanoes (Coastal Ranges of California, Cascades of Northwest); continues to operate in Northwest Flood) Uplift of Colorado Plateau Middle Miocene Large vertical uplift of flat region in American Southwest, with little internal disturbance; downward erosion of Colorado River produces Grand Canyon Exhumation

Holtz Jr., Thomas R.

49

Quantum-cascade lasers enable infrared sensors  

SciTech Connect (OSTI)

Quantum-cascade lasers (QCLs) are semiconductor-injection lasers based on intersubband transitions in a multiple-quantum-well heterostructure. They are designed using band-structure engineering and grown by molecular beam epitaxy. The emission wavelength of a QCL is primarily a function of quantum-well thickness--thinner quantum wells lead to shorter wavelengths--and is essentially independent of the material bandgap. Quantum-cascade lasers can be designed to operate at any wavelength from 3.5 m (infrared) to 67 m (terahertz region) and are continuously tunable through ranges of a few inverse centimeters.1, 2, 3 This capability makes them well suited for spectroscopy in the infrared (see Laser Focus World, August 1999, p. 40).

Schultz, John F. (BATTELLE (PACIFIC NW LAB))

2003-05-01T23:59:59.000Z

50

Hydrothermal Heat Discharge In The Cascade Range, Northwestern United  

Open Energy Info (EERE)

Page Page Edit History Facebook icon Twitter icon » Hydrothermal Heat Discharge In The Cascade Range, Northwestern United States Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Hydrothermal Heat Discharge In The Cascade Range, Northwestern United States Details Activities (3) Areas (1) Regions (0) Abstract: Hydrothermal heat discharge in the Cascade Range includes the heat discharged by thermal springs, by "slightly thermal" springs that are only a few degrees warmer than ambient temperature, and by fumaroles. Thermal-spring heat discharge is calculated on the basis of chloride-flux measurements and geothermometer temperatures and totals ~ 240 MW in the U.S. part of the Cascade Range, excluding the transient post-1980 discharge

51

Multi-stage Cascaded Stirling Refrigerator  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Multi-stage Cascaded Stirling Refrigerator Multi-stage Cascaded Stirling Refrigerator Los Alamos National Laboratory (LANL) researchers have developed a multi-stage refrigerator,...

52

Electromagnetic cascades and cascade nucleosynthesis in the early Universe  

Science Journals Connector (OSTI)

We describe a calculation of electromagnetic cascading in radiation and matter in the early Universe initiated by the decay of massive particles or by some other process. We have used a combination of Monte Carlo and numerical techniques which enables us to use exact cross sections, where known, for all the relevant processes. In cascades initiated after the epoch of big bang nucleosynthesis ? rays in the cascades will photodisintegrate He4, producing He3 and deuterium. Using the observed He3 and deuterium abundances we are able to place constraints on the cascade energy deposition as a function of cosmic time. In the case of the decay of massive primordial particles we place limits on the density of massive primordial particles as a function of their mean decay time, and on the expected intensity of decay neutrinos.

R. J. Protheroe; T. Stanev; V. S. Berezinsky

1995-04-15T23:59:59.000Z

53

Demonstration of air-guided quantum cascade lasers without top claddings  

E-Print Network [OSTI]

Demonstration of air-guided quantum cascade lasers without top claddings V. Moreau1, M. Bahriz1, R Abstract: We report on quantum cascade lasers employing waveguides based on a predominant air confinement mechanism in which the active region is located immediately at the device top surface. The lasers employ

Painter, Oskar

54

Problems of intraplate extensional tectonics, Western United...  

Open Energy Info (EERE)

on the Great Basin Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings: Problems of intraplate extensional tectonics, Western United...

55

Cascade redox flow battery systems  

DOE Patents [OSTI]

A reduction/oxidation ("redox") flow battery system includes a series of electrochemical cells arranged in a cascade, whereby liquid electrolyte reacts in a first electrochemical cell (or group of cells) before being directed into a second cell (or group of cells) where it reacts before being directed to subsequent cells. The cascade includes 2 to n stages, each stage having one or more electrochemical cells. During a charge reaction, electrolyte entering a first stage will have a lower state-of-charge than electrolyte entering the nth stage. In some embodiments, cell components and/or characteristics may be configured based on a state-of-charge of electrolytes expected at each cascade stage. Such engineered cascades provide redox flow battery systems with higher energy efficiency over a broader range of current density than prior art arrangements.

Horne, Craig R.; Kinoshita, Kim; Hickey, Darren B.; Sha, Jay E.; Bose, Deepak

2014-07-22T23:59:59.000Z

56

The roof of the cyclades : a structural, stratigraphic, and paleomagnetic study of Neogene extensional tectonics in Central Greece  

E-Print Network [OSTI]

In this thesis use a variety of geological observations to address the record of Neogene crustal deformation in the Central Aegean region, thereby providing new constraints on the overall geometric and tectonic evolution ...

Bradley, Kyle Edward

2012-01-01T23:59:59.000Z

57

Broadly tunable quantum cascade laser in cantilever-enhanced photoacoustic infrared spectroscopy of solids  

Science Journals Connector (OSTI)

An external cavity quantum cascade laser (EC-QCL) is applied in the...?1 (9701,646cm?1) in the mid-infrared region, which enables accurate broadband spectroscopy of large molecules. The high spectral power den...

J. Lehtinen; T. Kuusela

2014-06-01T23:59:59.000Z

58

MOLECULAR DYNAMICS SIMULATIONS OF DISPLACEMENT CASCADES IN MOLYBDENUM  

SciTech Connect (OSTI)

Molecular dynamics calculations have been employed to simulate displacement cascades in neutron irradiated Mo. A total of 90 simulations were conducted for PKA energies between 1 and 40 keV and temperatures from 298 to 923K. The results suggest very little effect of temperature on final defect count and configuration, but do display a temperature effect on peak defect generation prior to cascade collapse. Cascade efficiency, relative to the NRT model, is computed to lie between 1/4 and 1/3 in agreement with simulations performed on previous systems. There is a tendency for both interstitials and vacancies to cluster together following cascade collapse producing vacancy rich regions surrounded by interstitials. Although coming to rest in close proximity, the point defects comprising the clusters generally do not lie within the nearest neighbor positions of one another, except for the formation of dumbbell di-interstitials. Cascades produced at higher PKA energies (20 or 40 keV) exhibit the formation of subcascades.

Smith, Richard Whiting

2003-09-08T23:59:59.000Z

59

Quaternary volcanism, tectonics, and sedimentation in the Idaho National Engineering Laboratory area  

SciTech Connect (OSTI)

In this article, we discuss the regional context and describe localities for a two-day field excursion in the vicinity of the Idaho National Engineering Laboratory (INEL). We address several geologic themes: (1) Late Cenozoic, bimodal volcanism of the Eastern Snake River Plain (ESRP), (2) the regional tectonics and structural geology of the Basin and Range province to the northwest of the ESRP, (3) fluvial, lacustrine, and aeolian sedimentation in the INEL area, and (4) the influence of Quaternary volcanism and tectonics on sedimentation near the INEL.

Hackett, W.R.; Smith, R.P.

1992-09-01T23:59:59.000Z

60

Quaternary volcanism, tectonics, and sedimentation in the Idaho National Engineering Laboratory area  

SciTech Connect (OSTI)

In this article, we discuss the regional context and describe localities for a two-day field excursion in the vicinity of the Idaho National Engineering Laboratory (INEL). We address several geologic themes: (1) Late Cenozoic, bimodal volcanism of the Eastern Snake River Plain (ESRP), (2) the regional tectonics and structural geology of the Basin and Range province to the northwest of the ESRP, (3) fluvial, lacustrine, and aeolian sedimentation in the INEL area, and (4) the influence of Quaternary volcanism and tectonics on sedimentation near the INEL.

Hackett, W.R.; Smith, R.P.

1992-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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

Fire and the persistence and decline of montane chaparral in mixed conifer forests in the southern Cascades, Lassen Volcanic National Park, CA.  

E-Print Network [OSTI]

??Stands of montane chaparral are an integral component of the mixed conifer forest in the Cascade Mountains of northern California. In this region, chaparral stands (more)

Airey, Catherine

2012-01-01T23:59:59.000Z

62

Aeolian tones of a plate cascade  

Science Journals Connector (OSTI)

A model for the aeroacoustic resonance effects (aeolian tones) excited around a plate cascade in a gas flow is suggested. Methods of calculating the frequencies of natural acoustic oscillations near the cascade a...

S. V. Sukhinin

63

Synthesis of Cascade Refrigeration and Liquefaction Systems  

Science Journals Connector (OSTI)

Synthesis of Cascade Refrigeration and Liquefaction Systems ... Current Status and Perspectives of Liquefied Natural Gas (LNG) Plant Design ...

Francisco J. Barns; C. Judson King

1974-10-01T23:59:59.000Z

64

Interactive Synthesis of Cascade Refrigeration Systems  

Science Journals Connector (OSTI)

Interactive Synthesis of Cascade Refrigeration Systems ... Current Status and Perspectives of Liquefied Natural Gas (LNG) Plant Design ...

Wai Biu Cheng; Richard S. H. Mah

1980-07-01T23:59:59.000Z

65

Dynamic theory of cascades on finite clustered random networks with a threshold rule  

Science Journals Connector (OSTI)

Cascade dynamics on networks are usually analyzed statically to determine existence criteria for cascades. Here, the Watts model of threshold dynamics on random Erd?s-Rnyi networks is analyzed to determine the dynamic time evolution of cascades. The network is assumed to have a specific finite number of nodes n and is not assumed to be treelike. All combinations of threshold ?, network average nodal degree z, and seed sizes |S| from a single node up are included. The analysis permits study of network size effects and increased clustering coefficient. Several size effects not found by infinite network theory are predicted by the analysis and confirmed by simulations. In the region of ? and z where a single node can start a cascade, cascades are expanding, in the sense that each step flips a larger group than the previous step did. We show that this region extends to larger values of z than predicted by infinite network analyses. In the region where larger seeds are needed (size proportional to n), cascades begin by contracting: at the outset, each step flips fewer nodes than the previous step, but eventually the process reverses and becomes expanding. A critical mass that grows during the cascade beyond an easily-calculated threshold is identified as the cause of this reversal.

Daniel E. Whitney

2010-12-08T23:59:59.000Z

66

Engineering Light: Quantum Cascade Lasers  

ScienceCinema (OSTI)

Quantum cascade lasers are ideal for environmental sensing and medical diagnostic applications. Gmachl discusses how these lasers work, and their applications, including their use as chemical trace gas sensors. As examples of these applications, she briefly presents results from her field campaign at the Beijing Olympics, and ongoing campaigns in Texas, Maryland, and Ghana.

Claire Gmachl

2010-09-01T23:59:59.000Z

67

GaAsbased quantum cascade lasers  

Science Journals Connector (OSTI)

...N. Murdin GaAs-based quantum cascade lasers Sirtori H. Page C. Becker...state-of-the-art of GaAs-based quantum cascade lasers. These new light sources...2000.0739 GaAs-based quantum cascade lasers By C. Sirtori, H. Page...

2001-01-01T23:59:59.000Z

68

CASCADE OPTIMIZATION AND CONTROL OF BATCH REACTORS  

E-Print Network [OSTI]

CASCADE OPTIMIZATION AND CONTROL OF BATCH REACTORS Xiangming Hua, Sohrab Rohani and Arthur Jutan ajutan@uwo.ca Abstract: In this study, a cascade closed-loop optimization and control strategy for batch reactor. Using model reduction a cascade system is developed, which can effectively combine optimization

Jutan, Arthur

69

A multifrequency interband two-cascade laser  

SciTech Connect (OSTI)

Multifrequency lasing in a new class of injection heterolasers, i.e., in an interband two-cascade laser with a tunneling p-n junction separating two active regions of quantum wells located in the same waveguide is obtained and studied. The developed laser structure with pulsed pumping provided the simultaneous emission of two first-order modes with the wavelengths of 1.063 and 0.98 {mu}m and two third-order modes with the wavelengths of 0.951 and 0.894 {mu}m. Due to nonlinear mixing of the modes within the laser cavity, the generation of the second harmonics and sum frequencies was observed.

Biryukov, A. A.; Zvonkov, B. N.; Nekorkin, S. M.; Demina, P. B.; Semenov, N. N. [Research Physicotechnical Institute at the Nizhni Novgorod State University (Russian Federation); Aleshkin, V. Ya.; Gavrilenko, V. I.; Dubinov, A. A., E-mail: sanya@ipm.sci-nnov.ru; Marem'yanin, K. V.; Morozov, S. V. [Russian Academy of Sciences, Institute for Physics of Microstructures (Russian Federation); Belyanin, A. A.; Kocharovsky, V. V. [Texas A and M University, Department of Physics (United States); Kocharovsky, Vl. V. [Russian Academy of Sciences, Institute of Applied Physics (Russian Federation)

2007-10-15T23:59:59.000Z

70

Village of Cascade | Open Energy Information  

Open Energy Info (EERE)

Cascade Cascade Jump to: navigation, search Name Village of Cascade Facility Village of Cascade Sector Wind energy Facility Type Community Wind Facility Status In Service Owner Village of Cascade Energy Purchaser Village of Cascade Location Cascade WI Coordinates 43.65868218°, -87.99709797° 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":43.65868218,"lon":-87.99709797,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

71

TECTONICS, VOL. 19, NO. 5, PAGES 852-871 OCTOBER 2000 Tectonics of SE China  

E-Print Network [OSTI]

TECTONICS, VOL. 19, NO. 5, PAGES 852-871 OCTOBER 2000 Tectonics of SE China: New insightsfromYanSun4 Abstract.In southChina the Lushanmassifforms a JurassicthroughEarlyTriassic[e.g., Mattaueret al., 1985, topographichighof the SouthChinaBlocksouthof the 1991;Okayet al., 1993;Hackeret al., 1996

Paris-Sud XI, Université de

72

Geologic and tectonic characteristics of rockbursts  

SciTech Connect (OSTI)

The modern mining enterprises have attained such scales of engineering activity that their direct influence to a rock massif and in series of cases to the region seismic regime doesn`t provoke any doubts. Excavation and removal of large volumes of rock mass, industrial explosions and other technological factors during long time can lead to the accumulation of man-made changes in rock massifs capable to cause catastrophic consequences. The stress state changes in considerable domains of massif create dangerous concentration of stresses at large geological heterogeneities - faults localized in the mining works zone. External influence can lead in that case to such phenomena as tectonic rockbursts and man-made earthquakes. The rockbursts problem in world mining practice exists for more than two hundred years. So that its actuality not only doesn`t decrease but steadily mounts up as due to the mining works depth increase, enlargement of the useful minerals excavations volumes as due to the possibility of safe use of the rock massif potential energy for facilitating the mastering of the bowels of the Earth and for making that more cheap. The purpose of present work is to study the engineering activity influence to processes occurring in the upper part of Earth crust and in particular in a rock massif. The rock massif is treated in those studies as a geophysical medium - such approach takes into account the presence of block structure of medium and the continuous exchange of energy between parts of that structure. The idea ``geophysical medium`` is applied in geophysics sufficiently wide and stresses the difference of actual Earth crust and rock massifs from the continuous media models discussed in mechanics.

Adushkin, V.V. [Academy of Sciences, Moscow (Russian Federation). Inst. for Dynamics of the Geospheres; Charlamov, V.A.; Kondratyev, S.V.; Rybnov, Y.S.; Shemyakin, V.M.; Sisov, I.A.; Syrnikov, N.M.; Turuntaev, S.B.; Vasilyeva, T.V. [Lawrence Livermore National Lab., CA (United States)

1995-06-01T23:59:59.000Z

73

Dual wavelength emission from a terahertz quantum cascade laser  

SciTech Connect (OSTI)

We describe a heterogeneous THz quantum cascade laser that is composed of two different active region designs. This device emits simultaneously at around 2.5 THz and 2.9 THz with a certain frequency tunability by applied current. We also investigate the spectral gain in the structure by THz time-domain spectroscopy and correlate the gain spectral bandwidth with the alignment and wavelength emission behaviour of the two stack device.

Freeman, Joshua R.; Brewer, Anthony; Marshall, Owen P.; Beere, Harvey E.; Ritchie, David A. [Semiconductor Physics, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE (United Kingdom); Madeo, Julien; Dhillon, Sukhdeep; Jukam, Nathan; Oustinov, Dimitri; Tignon, Jerome [Laboratoire Pierre Aigrain, Ecole Normale Suprieure, UMR 8551 CNRS, UPMC Univ. Paris 6 75005 Paris (France)

2011-12-23T23:59:59.000Z

74

Piggyback Tectonics- Long-Term Growth Of Kilauea On The South Flank Of  

Open Energy Info (EERE)

Piggyback Tectonics- Long-Term Growth Of Kilauea On The South Flank Of Piggyback Tectonics- Long-Term Growth Of Kilauea On The South Flank Of Mauna Loa Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Piggyback Tectonics- Long-Term Growth Of Kilauea On The South Flank Of Mauna Loa Details Activities (0) Areas (0) Regions (0) Abstract: Compositional and age data from offshore pillow lavas and volcaniclastic sediments, along with on-land geologic, seismic, and deformation data, provide broad perspectives on the early growth of Kilauea Volcano and the long-term geometric evolution of its rift zones. Sulfur-rich glass rinds on pillow lavas and volcaniclastic sediments derived from them document early underwater growth of a large compositionally diverse alkalic edifice. The alkalic rocks yield 40Ar / 39Ar ages as old as about 275 ka; transitional-composition lavas, which

75

Effects of global eustatic sea level variations and tectonism on stratigraphy of Iraq  

SciTech Connect (OSTI)

The stratigraphy of Iraq is marked by complex vertical and lateral facies sequences controlled predominantly by two factors: (1) eustatic sea level variations, and (2) tectonic movements. Analysis of the sedimentary cycles provides a framework for evaluating the relative economic importance of transgressive versus regressive facies within the Iraq stratigraphic succession. Most reservoir rocks, principally reefal and neritic limestones and to a lesser extent deltaic facies, were deposited during relatively high sea level stands. Source rock depositional environments in Iraq were typically either deep subsiding or shallow restricted intrashelf basins. These environments were not controlled by sea level, but primarily by local tectonics. Applying modern theories of plate tectonics and sea level control of facies to this well-studied petroleum province allows new interpretations of the region's geologic evolution.

Gawarecki, S.L.; Schamel, S.

1986-05-01T23:59:59.000Z

76

Definition: Cascading Outage | Open Energy Information  

Open Energy Info (EERE)

Cascading Outage Cascading Outage Jump to: navigation, search Dictionary.png Cascading Outage The uncontrolled successive loss of system elements triggered by an incident at any location. Cascading results in widespread electric service interruption that cannot be restrained from sequentially spreading beyond an area predetermined by studies.[1] View on Wikipedia Wikipedia Definition A cascading failure is a failure in a system of interconnected parts in which the failure of a part can trigger the failure of successive parts. Such a failure may happen in many types of systems, including power transmission, computer networking, finance and bridges. Cascading failures usually begin when one part of the system fails. When this happens, nearby nodes must then take up the slack for the failed component. This overloads

77

Multiplexity-facilitated cascades in networks  

Science Journals Connector (OSTI)

Elements of networks interact in many ways, so modeling them with graphs requires multiple types of edges (or network layers). Here we show that such multiplex networks are generically more vulnerable to global cascades than simplex networks. We generalize the threshold cascade model [Watts, Proc. Natl. Acad. Sci. USA 99, 5766 (2002)] to multiplex networks, in which a node activates if a sufficiently large fraction of neighbors in any layer are active. We show that both combining layers (i.e., realizing other interactions play a role) and splitting a network into layers (i.e., recognizing distinct kinds of interactions) facilitate cascades. Notably, layers unsusceptible to global cascades can cooperatively achieve them if coupled. On one hand, this suggests fundamental limitations on predicting cascades without full knowledge of a system's multiplexity; on the other hand, it offers feasible means to control cascades by introducing or removing sparse layers in an existing network.

Charles D. Brummitt; Kyu-Min Lee; K.-I. Goh

2012-04-27T23:59:59.000Z

78

Contingency Analysis of Cascading Line Outage Events  

SciTech Connect (OSTI)

As the US power systems continue to increase in size and complexity, including the growth of smart grids, larger blackouts due to cascading outages become more likely. Grid congestion is often associated with a cascading collapse leading to a major blackout. Such a collapse is characterized by a self-sustaining sequence of line outages followed by a topology breakup of the network. This paper addresses the implementation and testing of a process for N-k contingency analysis and sequential cascading outage simulation in order to identify potential cascading modes. A modeling approach described in this paper offers a unique capability to identify initiating events that may lead to cascading outages. It predicts the development of cascading events by identifying and visualizing potential cascading tiers. The proposed approach was implemented using a 328-bus simplified SERC power system network. The results of the study indicate that initiating events and possible cascading chains may be identified, ranked and visualized. This approach may be used to improve the reliability of a transmission grid and reduce its vulnerability to cascading outages.

Thomas L Baldwin; Magdy S Tawfik; Miles McQueen

2011-03-01T23:59:59.000Z

79

Multiwavelength and supercontinuum quantum cascade lasers  

Science Journals Connector (OSTI)

Bandstructure engineering of intersubband optical transitions has led to a new class of quantum cascade lasers (QCL) that simultaneously emit multiple wavelengths by suitable...

Capasso, Federico; Gmachl, Claire; Sivco, Deborah; Cho, Al

80

Quantum Cascade Lasers: Coming of Age  

Science Journals Connector (OSTI)

The quantum cascade laser, first realized in 1994, has now demonstrated operation over an extremely wide wavelength range extending from the mid-infrared to the...

Faist, Jerome

Note: This page contains sample records for the topic "region cascades tectonic" 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

Electrically tunable terahertz quantum cascade lasers  

E-Print Network [OSTI]

In this thesis, microelectromechanical systems (MEMS) assisted electrically tunable terahertz quantum cascade lasers (THz QCLs) are designed and demonstrated. Two MEMS tuner devices are proposed to achieve electrically ...

Han, Ningren

2013-01-01T23:59:59.000Z

82

Cascade Control and Defense in Complex Networks  

Science Journals Connector (OSTI)

Complex networks with a heterogeneous distribution of loads may undergo a global cascade of overload failures when highly loaded nodes or edges are removed due to attacks or failures. Since a small attack or failure has the potential to trigger a global cascade, a fundamental question regards the possible strategies of defense to prevent the cascade from propagating through the entire network. Here we introduce and investigate a costless strategy of defense based on a selective further removal of nodes and edges, right after the initial attack or failure. This intentional removal of network elements is shown to drastically reduce the size of the cascade.

Adilson E. Motter

2004-08-26T23:59:59.000Z

83

Amplification Factors for Spectral Acceleration in Tectonically Active Regions  

Science Journals Connector (OSTI)

...Japan (classified by Fukushima et al., 2000), 8...Southern California Aerial Mapping Project (SCAMP...Japan (classified by Fukushima et al., 2000), 8...Southern California Aerial Mapping Project Amplification...Am. 90, S222S244. Fukushima, Y., K. Irikura...

Jonathan P. Stewart; Andrew H. Liu; Yoojoong Choi

84

Whole Earth Structure and Plate Tectonics  

E-Print Network [OSTI]

) 211/29/2010 Plate Tectonics ­ Historical Overview (optional) Unifying theory for the geologic (continental) flora on S hemisphere (India, Australia, Africa, S America, Antarctica), Permian glaciation: east Asia lavas with reversals 1930s Expanding earth theories (e.g. Carey) 1930s Start ocean basin

85

Heat Flow From Four New Research Drill Holes In The Western Cascades,  

Open Energy Info (EERE)

From Four New Research Drill Holes In The Western Cascades, From Four New Research Drill Holes In The Western Cascades, Oregon, Usa Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Heat Flow From Four New Research Drill Holes In The Western Cascades, Oregon, Usa Details Activities (1) Areas (1) Regions (0) Abstract: Conceptual models of the thermal structure of the Oregon Cascade Range propose either (1) a narrow zone of magmatic heat sources, flanked by shallow heat-flow anomalies caused by lateral ground-water flow; or (2) a wide zone of magmatic heat sources, with localized, generally negligible ground-water effects. The proposed narrow heat source coincides with the Quaternary volcanic arc, whereas the wider heat source would extend 10-30 km west of the arc. To test the models, four new heat-flow holes were sited

86

Atomic-Scale Simulations of Cascade Overlap and Damage Evolution...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Atomic-Scale Simulations of Cascade Overlap and Damage Evolution in Silicon Carbide. Atomic-Scale Simulations of Cascade Overlap and Damage Evolution in Silicon Carbide. Abstract:...

87

Multiple-junction quantum cascade photodetectors for thermophotovoltaic energy conversion  

Science Journals Connector (OSTI)

The use of intersubband transitions in quantum cascade structures for thermophotovoltaic energy conversion is investigated numerically. The intrinsic cascading scheme, spectral...

Yin, Jian; Paiella, Roberto

2010-01-01T23:59:59.000Z

88

Compact Quantum Cascade Laser Transmitter  

SciTech Connect (OSTI)

): In this paper we present design considerations, thermal and optical modeling results, and device performance for a ruggedized, compact laser transmitter that utilizes a room temperature quantum cascade (QC) laser source. The QC laser transmitter is intended for portable mid-infrared (3-12 m) spectroscopy applications, where the atmospheric transmission window is relatively free of water vapor interference and where the molecular rotational vibration absorption features can be used to detect and uniquely identify chemical compounds of interest. Initial QC laser-based sensor development efforts were constrained by the complications of cryogenic operation. However, improvements in both QC laser designs and fabrication processes have provided room-temperature devices that now enable significant miniaturization and integration potential for national security, environmental monitoring, atmospheric science, and industrial safety applications.

Anheier, Norman C.; Hatchell, Brian K.; Gervais, Kevin L.; Wojcik, Michael D.; Krishnaswami, Kannan; Bernacki, Bruce E.

2009-04-01T23:59:59.000Z

89

External cavity quantum cascade laser  

Science Journals Connector (OSTI)

In this paper we review the progress of the development of mid-infrared quantum cascade lasers (QCLs) operated in an external cavity configuration. We concentrate on QCLs based on the bound-to-continuum design, since this design is especially suitable for broadband applications. Since they were first demonstrated, these laser-based tunable sources have improved in performance in terms of output power, duty cycle, operation temperature and tuneability. Nowadays they are an interesting alternative to FTIRs for some applications. They operate at room temperature, feature a high spectral resolution while being small in size. They were successfully used in different absorption spectroscopy techniques. Due to their vast potential for applications in industry, medicine, security and research, these sources enjoy increasing interest within the research community as well as in industry.

Andreas Hugi; Richard Maulini; Jrme Faist

2010-01-01T23:59:59.000Z

90

Structural traps I, tectonic fold traps  

SciTech Connect (OSTI)

This book contains studies of fields that exist because of the presence of an anticline; without the anticline there would be no trap. The fields described in this volume illustrate the complex nature of a trap type that some explorationists mistakenly regard as simple and therefore not worthy of close scrutiny. Anticlinal traps are like all other fields - each has its own peculiar personality. Many of the fields in this volume are sourced from continentally derived organic matter. All have sandstone reservoirs. Most have shale seals, but one, Sarir, has an evaporite seal. Many are faulted anticlines. Some of the anticlines formed in a compressional tectonic setting, whereas others formed in a tensional tectonic setting.

Beaumont, E.A.; Foster, N.H.

1990-01-01T23:59:59.000Z

91

US geothermal database and Oregon cascade thermal studies: (Final report)  

SciTech Connect (OSTI)

This report describes two tasks of different nature. The first of these tasks was the preparation of a data base for heat flow and associated ancillary information for the United States. This data base is being used as the basis for preparation of the United States portion of a geothermal map of North America. The ''Geothermal Map of North America'' will be published as part of the Decade of North American Geology (DNAG) series of the Geological Society of America. The second of these tasks was to make a geothermal evaluation of holes drilled in the Cascade Range as part of a Department of Energy (DOE)/Industry co-sponsored deep drilling project. This second task involved field work, making temperature logs in the holes, and laboratory work, measuring thermal conductivity measurements on an extensive set of samples from these holes. The culmination of this task was an interpretation of heat flow values in terms of the regional thermal conditions; implications for geothermal systems in the Cascade Range; evaluation of the effect of groundwater flow on the depths that need to be drilled for successful measurements in the Cascade Range; and investigation of the nature of the surface groundwater effects on the temperature-depth curves. 40 refs., 7 figs., 7 tabs.

Blackwell, D.D.; Steele, J.L.; Carter, L.

1988-05-01T23:59:59.000Z

92

Self-consistent thermal simulation of GaAs/Al0.45Ga0.55As quantum cascade lasers  

Science Journals Connector (OSTI)

This paper presents a self-consistent thermal model for quantum cascade lasers (QCLs) that takes into account the nonuniform heat generation distribution in the active region as well as the temperature dependences of the heat generation rate and thermal ... Keywords: Heating, Monte Carlo, Nonlinear effects, Phonon transport, Quantum cascade lasers, Thermal model

Y. B. Shi; Z. Aksamija; I. Knezevic

2012-03-01T23:59:59.000Z

93

Structure, Stratigraphy, and Tectonics of the Dixie Valley Geothermal Site,  

Open Energy Info (EERE)

Stratigraphy, and Tectonics of the Dixie Valley Geothermal Site, Stratigraphy, and Tectonics of the Dixie Valley Geothermal Site, Dixie Valley, Nevada Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Structure, Stratigraphy, and Tectonics of the Dixie Valley Geothermal Site, Dixie Valley, Nevada Author Gabriel L. Plank Published Journal Geothermal Resources Council Transactions, 1995 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Structure, Stratigraphy, and Tectonics of the Dixie Valley Geothermal Site, Dixie Valley, Nevada Citation Gabriel L. Plank. 1995. Structure, Stratigraphy, and Tectonics of the Dixie Valley Geothermal Site, Dixie Valley, Nevada. Geothermal Resources Council Transactions. 19: (!) . Retrieved from "http://en.openei.org/w/index.php?title=Structure,_Stratigraphy,_and_Tectonics_of_the_Dixie_Valley_Geothermal_Site,_Dixie_Valley,_Nevada&oldid=682622"

94

Type E: Extensional Tectonic, Fault-Controlled Resource | Open Energy  

Open Energy Info (EERE)

Type E: Extensional Tectonic, Fault-Controlled Resource Type E: Extensional Tectonic, Fault-Controlled Resource Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Type E: Extensional Tectonic, Fault-Controlled Resource Dictionary.png Type E: Extensional Tectonic, Fault-Controlled Resource: No definition has been provided for this term. Add a Definition Brophy Occurrence Models This classification scheme was developed by Brophy, as reported in Updating the Classification of Geothermal Resources.[1] Type A: Magma-heated, Dry Steam Resource Type B: Andesitic Volcanic Resource Type C: Caldera Resource Type D: Sedimentary-hosted, Volcanic-related Resource Type E: Extensional Tectonic, Fault-Controlled Resource Type F: Oceanic-ridge, Basaltic Resource Extensional-tectonic, fault-controlled resources typically result from a

95

Monitoring Alfvn Cascades with Interferometry on the JET Tokamak  

Science Journals Connector (OSTI)

A microwave interferometry technique is applied for the first time for detecting a discrete spectrum of Alfvn cascade (AC) eigenmodes excited with fast ions in reversed magnetic shear plasmas of the Joint European Torus. The interferometry measurements of plasma density perturbations associated with ACs show an unprecedented frequency and time resolution superior to that obtained with external magnetic coils. The measurements of ACs are used for monitoring the evolution of the safety factor and density of rational magnetic surfaces in the region of maximum plasma current.

S. E. Sharapov; B. Alper; J. Fessey; N. C. Hawkes; N. P. Young; R. Nazikian; G. J. Kramer; D. N. Borba; S. Hacquin; E. De La Luna; S. D. Pinches; J. Rapp; D. Testa; JET-EFDA Contributors

2004-10-12T23:59:59.000Z

96

Influence of nonparabolicity on electronic structure of quantum cascade laser  

Science Journals Connector (OSTI)

Abstract We analyze the influence of nonparabolicity on the bound electronic states in the conduction-band of quantum wells in external electric field. Numerical results, obtained by transfer matrix method are presented for active region of GaAs/Al0.3Ga0.7As quantum cascade laser. The structure was initially optimized by genetic algorithm, using Kane's model of nonparabolicity, with emission wavelength set to ? ? 15.1 ?m . However, our numerical results indicate the change in lasing wavelength to 14.04 ?m when using a more comprehensive description of nonparabolicity.

Nikola Vukovi?; Vitomir Milanovi?; Jelena Radovanovi?

2014-01-01T23:59:59.000Z

97

Unsteady aerodynamic analysis of subsonic oscillating cascade  

SciTech Connect (OSTI)

This paper describes the development of the source-doublet-based potential paneling method for oscillating cascade unsteady aerodynamic load predictions. By using the integral influence coefficient method and by using the interblade phase angles, the unsteady loads on an oscillating cascade can be accurately predicted at a minimum cost. As the grids are placed only on the blade surfaces, the blades are allowed to vibrate without grid deformation problems. Four notable subsonic oscillating cascade test cases that cover most important parameters, e.g., blade geometry, interblade phase angle, flow coefficient, flow speed, frequency, etc., are studied in this paper. The agreement between the present solutions and other numerical/experimental results demonstrates the robustness of the present model. Applicability of the method for realistic compressible flow cascades is also discussed.

Chen, S.H.; Eastland, A.H.; Jackson, E.D. (Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Div.)

1994-07-01T23:59:59.000Z

98

Product Lifecycle Approach to Cascade Impaction Measurements  

Science Journals Connector (OSTI)

During development of an orally inhaled product (OIP), its full-resolution Aerodynamic Particle Size...in vitro performance (1,2). The pharmacopeial eight-stage Andersen Cascade Impactor (ACI) or Next-Generation ...

Terrence P. Tougas; Dave Christopher; Jolyon Mitchell

2011-03-01T23:59:59.000Z

99

Modeling techniques for quantum cascade lasers  

E-Print Network [OSTI]

Quantum cascade lasers are unipolar semiconductor lasers covering a wide range of the infrared and terahertz spectrum. Lasing action is achieved by using optical intersubband transitions between quantized states in specifically designed multiple-quantum-well heterostructures. A systematic improvement of quantum cascade lasers with respect to operating temperature, efficiency and spectral range requires detailed modeling of the underlying physical processes in these structures. Moreover, the quantum cascade laser constitutes a versatile model device for the development and improvement of simulation techniques in nano- and optoelectronics. This review provides a comprehensive survey and discussion of the modeling techniques used for the simulation of quantum cascade lasers. The main focus is on the modeling of carrier transport in the nanostructured gain medium, while the simulation of the optical cavity is covered at a more basic level. Specifically, the transfer matrix and finite difference methods for solvin...

Jirauschek, Christian

2014-01-01T23:59:59.000Z

100

Quantum Cascade Lasers Emitting below 3 m  

Science Journals Connector (OSTI)

First quantum cascade lasers emitting below 3 m are demonstrated. The lasers based on the InAs/AlSb material system emit at 2.95-2.97 m at 83 K and operate up to room temperature.

Devenson, Jan; Teissier, Roland; Cathabard, Olivier; Baranov, Alexei N

Note: This page contains sample records for the topic "region cascades tectonic" 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

Emission spectra of terahertz quantum cascade laser  

Science Journals Connector (OSTI)

We calculated energy levels, wave functions, and energies of radiative transitions in terahertz quantum cascade lasers based on GaAs/Al0.15Ga0.85As heterostructures. Current-voltage characteristics and current de...

A. V. Antonov; V. I. Gavrilenko; A. V. Ikonnikov

2009-07-01T23:59:59.000Z

102

Frequency tuning of THz quantum cascade lasers  

Science Journals Connector (OSTI)

Tunable single-mode THz quantum cascade lasers are crucial for spectroscopy applications. Current and temperature tuning are limited to a few GHz and other solutions have to be...

Tredicucci, Alessandro

103

OligoceneMiocene tectonic evolution of the South Fiji Basin and Northland Plateau, SW Pacific Ocean: Evidence from  

E-Print Network [OSTI]

investigated parts of the southwest Pacific Ocean. It is a region of remnant volcanic arcs, plateaus and basins of the study area in the SW Pacific Ocean, showing geographic names and dredge locations from ChurkinOligocene­Miocene tectonic evolution of the South Fiji Basin and Northland Plateau, SW Pacific

Demouchy, Sylvie

104

Contemporary Tectonic Deformation of the Basin and Range Province...  

Open Energy Info (EERE)

Journal Article: Contemporary Tectonic Deformation of the Basin and Range Province, Western United States: 10 Years of Observation with the Global Positioning System Abstract...

105

Proterozoic palaeomagne tism and single continent plate tectonics  

Science Journals Connector (OSTI)

......Models of orbital evolution based on the historic and present values of tidal torque require...J. & Kelm, D. J., 1972. Pre-Permian global tectonics: a tectonic test, Bull...palaeomagnetic directions from the Amadeus Basin, Central Australia, Earth planet. Sci......

J. D. A. Piper

1983-07-01T23:59:59.000Z

106

Cascade Municipal Utilities | Open Energy Information  

Open Energy Info (EERE)

Cascade Municipal Utilities Cascade Municipal Utilities Jump to: navigation, search Name Cascade Municipal Utilities Place Iowa Utility Id 3137 Utility Location Yes Ownership M NERC Location MRO NERC MRO Yes ISO MISO Yes Operates Generating Plant Yes Activity Generation Yes Activity Transmission Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png All Electric Rate Residential City/Interdept. Rate Commercial Commercial Rate 3-phase Commercial Commercial Rate Single-phase Commercial Demand Rate Industrial Residential Rates Residential Average Rates Residential: $0.1040/kWh

107

SPONTANEOUS CURRENT-LAYER FRAGMENTATION AND CASCADING RECONNECTION IN SOLAR FLARES. I. MODEL AND ANALYSIS  

SciTech Connect (OSTI)

Magnetic reconnection is commonly considered to be a mechanism of solar (eruptive) flares. A deeper study of this scenario reveals, however, a number of open issues. Among them is the fundamental question of how the magnetic energy is transferred from large, accumulation scales to plasma scales where its actual dissipation takes place. In order to investigate this transfer over a broad range of scales, we address this question by means of a high-resolution MHD simulation. The simulation results indicate that the magnetic-energy transfer to small scales is realized via a cascade of consecutively smaller and smaller flux ropes (plasmoids), analogous to the vortex-tube cascade in (incompressible) fluid dynamics. Both tearing and (driven) 'fragmenting coalescence' processes are equally important for the consecutive fragmentation of the magnetic field (and associated current density) into smaller elements. At the later stages, a dynamic balance between tearing and coalescence processes reveals a steady (power-law) scaling typical of cascading processes. It is shown that cascading reconnection also addresses other open issues in solar-flare research, such as the duality between the regular large-scale picture of (eruptive) flares and the observed signatures of fragmented (chaotic) energy release, as well as the huge number of accelerated particles. Indeed, spontaneous current-layer fragmentation and the formation of multiple channelized dissipative/acceleration regions embedded in the current layer appear to be intrinsic to the cascading process. The multiple small-scale current sheets may also facilitate the acceleration of a large number of particles. The structure, distribution, and dynamics of the embedded potential acceleration regions in a current layer fragmented by cascading reconnection are studied and discussed.

Barta, Miroslav; Buechner, Joerg [Max Planck Institute for Solar System Research, D-37191 Katlenburg-Lindau (Germany); Karlicky, Marian; Skala, Jan, E-mail: barta@mps.mpg.de [Astronomical Institute of the Academy of Sciences of the Czech Republic, CZ-25165 Ondrejov (Czech Republic)

2011-08-10T23:59:59.000Z

108

Hydrothermal monitoring data from the Cascade Range, northwestern United States  

E-Print Network [OSTI]

Hydrothermal monitoring data from the Cascade Range, northwestern United States By S.E. Ingebritsen., and Evans, W.C., 2014, Hydrothermal monitoring data from the Cascade Range, northwestern United States: U ...................................................................................................................................27 (8) Carbonate springs

109

Cascade County Secondary Data Analysis  

E-Print Network [OSTI]

prevalence (Heart Attack) 4.0% 4.1% 6.0% All Sites Cancer 461.9 (Region 2) 455.5 543.2 1 Community Johnson Foundation (2012) Leading Causes of Death County1 Montana1,2 Nation2 1. Cancer 2. Heart Disease 3. CLRD* 1. Cancer 2. Heart Disease 3.CLRD* 1. Heart Disease 2. Cancer 3. CLRD* #12

Maxwell, Bruce D.

110

Energy Cascading Combined with Thermal Energy Storage in Industry  

Science Journals Connector (OSTI)

The opportunities for energy conservation through the application of storage cascades has not previously been examined in...

R. J. Wood; D. T. Baldwin; P. W. OCallaghan

1983-01-01T23:59:59.000Z

111

FY 2005 Quantum Cascade Laser Alignment System Final Report  

SciTech Connect (OSTI)

The Alignment Lasers Task of Pacific Northwest National Laboratory's (PNNL's) Remote Spectroscopy Project (Project PL211I) is a co-funded project between DOE NA-22 and a Classified Client. This project, which began in the second half of FY03, involved building and delivering a Quantum Cascade (QC) Laser Alignment System to be used for testing the pupil alignment of an infrared sensor by measuring the response from four pairs of diametrically opposed QC lasers. PNNL delivered the system in FY04 and provided technical assistance in FY05 culminating into a successful demonstration of the system. This project evolved from the Laser Development Task of PL211I, which is involved in developing novel laser technology to support development of advanced chemical sensors for detecting the proliferation of nuclear weapons. The laser systems are based on quantum cascade (QC) lasers, a new semiconductor source in the infrared. QC lasers can be tailored to emit light throughout the infrared region (3.5 ? 17 ?m) and have high output power and stability. Thus, these lasers provide an infrared source with superb power and spectral stability enabling them to be used for applications such as alignment and calibration in addition to chemical sensing.

Myers, Tanya L.; Cannon, Bret D.; Wojcik, Michael D.; Broocks, Bryan T.; Stewart, Timothy L.; Hatchell, Brian K.

2006-01-11T23:59:59.000Z

112

Classical Radiative Cascade in Antiproton Atoms  

SciTech Connect (OSTI)

An interrelation between radiative cascade transitions and annihilation rates in antiproton atoms is considered. The population of antiproton atom energy levels is described by a classical distribution function f(n,l), determining intensities of spectral lines in antiproton atoms. A strong dependence of spectral line intensities on the nuclear size is shown which could be used for the determination of effective nuclear radius.

Bureyeva, L. [Institute of Spectroscopy of the RAS, Troitsk, Moscow Reg., 142190 (Russian Federation); Lisitsa, V. [Nuclear Fusion Institute, Russian Research Center 'Kurchatov Institute' Moscow (Russian Federation); Putlitz, G. zu [Physikalisches Institut, Universitaet Heidelberg, Philosophenweg 12, 69120 Heidelberg (Germany)

2005-10-26T23:59:59.000Z

113

Emission Measurement with Quantum Cascade Laser  

Science Journals Connector (OSTI)

With the Mexa-1400QL-NX Horiba offers a new exhaust gas measurement solution which is based on the Quantum Cascade Laser technology. The new method is able to...2, N2O and NH3 emissions and is a tool for research...

Matthias Schrder; Dipl.-Phys. Daniel Scheder; Werner Czika

2011-05-01T23:59:59.000Z

114

Sequential resonant tunneling in quantum cascade lasers  

SciTech Connect (OSTI)

A model of sequential resonant tunneling transport among two-dimensional subbands that takes into account explicitly elastic scattering is investigated. It is compared to transport measurements performed on quantum cascade lasers, where resonant tunneling processes are known to be dominating. Excellent agreement is found between experiment and theory over a large range of current, temperature, and device structures.

Terazzi, Romain; Gresch, Tobias; Wittmann, Andreas; Faist, Jerome [Quantum Optoelectronics Group, Institute for Quantum Electronics, ETH, 8086 Zuerich (Switzerland)

2008-10-15T23:59:59.000Z

115

13 - Terahertz (THz) quantum cascade lasers  

Science Journals Connector (OSTI)

Abstract: This chapter is dedicated to terahertz (THz) quantum cascade laser technology. After a brief introduction that contains a description of the current state of the art in terms of performance, the following important technological aspects are reviewed in more detail: waveguide and photonic structures, frequency and phase stabilisation, and active mode-locking.

S. Barbieri; S. Kumar

2013-01-01T23:59:59.000Z

116

Cascaded frequency doublers for broadband laser radiation  

SciTech Connect (OSTI)

A new scheme of a cascaded converter of the first harmonic of broadband cw laser radiation into the second harmonic (SH) with compensation for the group walk-off in cascades is proposed and investigated. The conditions under which high conversion coefficients of broadband ({approx}33 cm{sup -1}) single-mode fibre laser radiation with low peak power ({approx}300 W) into the SH are determined for frequency doublers based on the most promising LBO crystal. Conversion of cw radiation with an average power of 300 W and efficiency {eta} = 4.5 % into the SH is obtained in a single LBO crystal. Effect of coherent addition of SH radiation excited in different cascades is demonstrated for two- and three-stage schemes. The expected conversion efficiencies, calculated disregarding loss but taking into account real aberrations of elements, are 18 % and 38 %, respectively. The effect of pumping depletion begins to manifest itself in the third cascade of a three-stage converter; it may reduce the latter value to {approx}30 %. (nonlinear optical phenomena)

Andreev, N F; Vlasova, K V; Davydov, V S; Kulikov, S M; Makarov, A I; Sukharev, Stanislav A; Freidman, Gennadii I; Shubin, S V

2012-10-31T23:59:59.000Z

117

Multiperiod quantum-cascade nanoheterostructures: Epitaxy and diagnostics  

SciTech Connect (OSTI)

Advances in the production technology of multiperiod nanoheterostructures of quantum-cascade lasers with 60 cascades by molecular-beam epitaxy (MBE) on an industrial multiple-substrate MBE machine are discussed. The results obtained in studying the nanoheterostructures of quantum-cascade lasers by transmission electron microscopy, high-resolution X-ray diffraction analysis, and photoluminescence mapping are presented.

Egorov, A. Yu., E-mail: Anton@beam.ioffe.ru; Brunkov, P. N.; Nikitina, E. V.; Pirogov, E. V.; Sobolev, M. S.; Lazarenko, A. A. [Russian Academy of Sciences, St. Petersburg Academic University, Nanotechnology Research and Education Center (Russian Federation); Baidakova, M. V.; Kirilenko, D. A.; Konnikov, S. G. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)

2014-12-15T23:59:59.000Z

118

STATEMENT OF CONSIDERATIONS REQUEs·r BY CASCADE ENGINEERI NG, INC. (CASCADE) FOR AN ADVANCE  

Broader source: Energy.gov (indexed) [DOE]

REQUEs·r BY CASCADE ENGINEERI REQUEs·r BY CASCADE ENGINEERI NG, INC. (CASCADE) FOR AN ADVANCE WA IVER OF DOMESTIC AND FORE IGN PATENT RIGHTS UNDER DOE AWARD NO. DE-EE0005440; W(A) 201 1-070 CASCAD E has requested a waiver of domesti c and fore ign patent rights of the United States of America in all subject inventions arising from its participation under the above refe renced cooperative agreeme nt entitl ed " Innovative Ballasted Flat Roof Solar PV Racking System." According to the Statement o f Project Objectives, the objectives of the project funded by the cooperative agreement arc to " [ dlesign, develop, engineer, manufacture, and market a flat roof so lar PV racking sys tem. This racking system will o±Ier a cost advantage from a materials and installation labor (mechanical and electrical) perspective. It will be flexible enough to

119

Broadband Distributed Feedback Quantum Cascade Laser Array Using a Heterogeneous Cascade  

Science Journals Connector (OSTI)

We demonstrated an array of distributed feedback quantum cascade lasers covering a spectral range of 220cm-1. The variability in threshold current and slope efficiency is explained in...

Diehl, Laurent; Lee, Benjamin G; Zhang, Haifei A; Pflgl, Christian; Belkin, Mikhail; Fisher, Milan; Wittman, Andreas; Faist, Jerome; Capasso, Federico

120

Preservation of Proterozoic terrane boundaries within the Colorado Plateau and implications for its tectonic evolution  

Science Journals Connector (OSTI)

During the Proterozoic, the North American continent grew by the accretion of arcs onto the Archean craton. Subsequent tectonic events affected much of the lithosphere of western North American resulting in the destruction of many of the features that reflect continental growth. The Colorado Plateau, which is centrally located within the tectonically active western portion of North America, experienced only minor amounts of volcanism during subsequent magmatic events, and has undergone comparatively little internal deformation during the remainder of the Precambrian and Phanerozic, despite the occurrence of some significant tectonic events. Because the lithosphere of the plateau has not been significantly reworked by tectonic events it may have retained structures since accretion that give insight into processes of continental growth. The crust of the southeastern portion of the Colorado Plateau, revealed here through seismic data recorded by the temporary SPE and LA RISTRA arrays, is greater than 40km thick and possesses distinct changes in intercrustal layering and the character of the Moho. The Moho appears quite dim towards the center of the plateau and much brighter along its southeastern margins. Connecting changes in crustal features that are common between the two arrays indicates a northeastern structural trend that matches the pattern of gravity anomalies in the region. Differences in crustal structures between terranes extend across much of the crust suggesting that entire distinct crustal columns align with terrane boundaries. It is unlikely that extensive crustal flow, as required by some models of plateau evolution, could have traversed across the entire Colorado Plateau without producing features that cross-cut these boundaries.

Hersh Gilbert; Aaron A. Velasco; George Zandt

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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

Renewal: Continential lithosphere evolution as a function of tectonic environment  

SciTech Connect (OSTI)

The Cenozoic tectonic environment and stress regime of the southwestern United States have changed dramatically from compression during shallow-angle subduction during the Laramide orogeny in the early Cenozoic to the current mode of Basin and Range extension. Questions remain unresolved concerning the causes of this transition, including the timing of the initiation of extension (estimates range from 36 to 25 Ma), and is the Basin and Range simply an mega-example of back-arc extension, or is extension related to the subduction of an oceanic spreading center about 30 Ma? We have examined the patterns of magmagenesis and geochemical composition through Cenozoic time in southern New Mexico. We have defined four magma sources that have contributed to Cenozoic magmas. Immediately following the Laramide, magmas contain substantial contributions from the lower crust. Mid-Tertiary extension is related to the eruption of rhyolitic ash-flow tuffs and basalts. The basalts were generated by melting of the lithospheric mantle; intercalated rhyolites have a strong upper crustal signature. Eruption of basalts and andesites with sources in the lithospheric mantle and lower crust continued for several million years after rhyolitic volcanism ceased. The region was nearly void of volcanic activity for 16 million years despite continued extension, but at 10 Ma, basalts derived from the asthenosphere began to erupt.

McMillan, N.J. [New Mexico State Univ., Las Cruces, NM (United States). Dept. of Geological Sciences; Baldridge, W.S. [Los Alamos National Lab., NM (United States)

1995-06-01T23:59:59.000Z

122

DETAILED COMPARISON BETWEEN PARTON CASCADE AND HADRONIC CASCADE AT SPS AND RHIC.  

SciTech Connect (OSTI)

The authors study the importance of the partonic phase produced in relativistic heavy ion collision by comparing the parton cascade model and the hadronic cascade model. Hadron yield, baryon stopping and transverse momentum distribution are calculated with JAM and discussions are given comparing with VNI. Both of these models give good description of experimental data. They also discuss the strangeness production mechanism and the directed transverse flow.

NARA,Y.

1998-10-23T23:59:59.000Z

123

Investigation of the thermal regime and geologic history of the Cascade volcanic arc: First phase of a program for scientific drilling in the Cascade Range  

SciTech Connect (OSTI)

A phased, multihole drilling program with associated science is proposed as a means of furthering our understanding of the thermal regime and geologic history of the Cascade Range of Washington, Oregon, and northern California. The information obtained from drilling and ancillary geological and geophysical investigations will contribute to our knowledge in the following general areas: (1) the magnitude of the regional background heat flow of parts of the Quaternary volcanic belt dominated by the most abundant volcanic rock types, basalt and basaltic andesite; (2) the nature of the heat source responsible for the regional heat-flow anomaly; (3) the characteristics of the regional hydrothermal and cold-water circulation; the rates of volcanism for comparison with models for the rate and direction of plate convergence of the Cascades; (5) the history of deformation and volcanism in the volcanic arc that can be related to subduction; (6) the present-day stress regime of the volcanic arc and the relation of these stresses to plate interactions and possible large earthquakes; and the current geometry of the subducted oceanic plate below the Cascade Range and the relationship of the plate to the distribution of heat flow, Quaternary volcanism, and Quaternary deformation. Phase I research will be directed toward a detailed investigation of the Santiam Pass segment. In concert with the Santiam Pass research, a detailed study of the nearby Breitenbush Hot Springs area is also recommended as a component of Phase I. The object of the Breitenbush research is to study one of the hottest known Cascade hydrothermal systems, which coincidentally also has a good geological and geophysical data base. A coordinated program of drilling, sampling, subsurface measurements, and surface surveys will be associated with the drilling of several holes.

Priest, G.R.

1987-01-01T23:59:59.000Z

124

Tectonic studies in Beichuan : rebuilding the Beichuan Middle School  

E-Print Network [OSTI]

In his essay, Studies in Tectonic Culture, Kenneth Frampton asserts that the built environment is "first and foremost a construction, and only later an abstract discourse." Building upon this logic, this thesis asks how ...

Taylor, Christopher (Christopher Jordon)

2009-01-01T23:59:59.000Z

125

Landscape responses to intraplate tectonism: Quantitative constraints from 10  

E-Print Network [OSTI]

Landscape responses to intraplate tectonism: Quantitative constraints from 10 Be nuclide abundances approach for identifying neotectonic forcing of landscape evolution in mildly deforming continental or absent, implying that 10 Be concentration may act as a `tracer' for disequilibrium landscapes responding

Sandiford, Mike

126

Category:Geothermal Regions | Open Energy Information  

Open Energy Info (EERE)

Geothermalpower.jpg Geothermalpower.jpg Looking for the Geothermal Regions page? For detailed information on Geothermal Regions, click here. Category:Geothermal Regions Add.png Add a new Geothermal Region Pages in category "Geothermal Regions" The following 22 pages are in this category, out of 22 total. A Alaska Geothermal Region C Cascades Geothermal Region Central Nevada Seismic Zone Geothermal Region G Gulf of California Rift Zone Geothermal Region H Hawaii Geothermal Region Holocene Magmatic Geothermal Region I Idaho Batholith Geothermal Region N Northern Basin and Range Geothermal Region N cont. Northern Rockies Geothermal Region Northwest Basin and Range Geothermal Region O Outside a Geothermal Region R Rio Grande Rift Geothermal Region S San Andreas Geothermal Region San Andreas Split Geothermal Region

127

Remote Chemical Sensing Using Quantum Cascade Lasers  

SciTech Connect (OSTI)

Research done by the IR sensors team at PNNL is focused on developing advanced spectroscopic methods for detecting signatures of nuclear, chemical, biological and explosives weapons or weapons production. The sensors we develop fall into two categories: remote sensors that can be operated at distances ranging from 150 m to 10 km, and point sensors that are used for in-situ inspection and detection. FY03 has seen an explosion in FM DIAL progress with the net result being solid confirmation that FM DIAL is a technique capable of remote chemical monitoring in a wide variety of venues. For example, FM DIAL was used to detect a small plume of hydrogen sulfide, a candidate CW agent, released in the desert environment of the Hanford 200 Area site. These experiments were conducted over a range of physical conditions including outside temperatures ranging from 70 F to 105 F and turbulence conditions ranging from quiescent to chaotic. We are now rapidly developing the information needed to design prototype FM DIAL systems that are optimized for specific applications that include scenarios such as fixed position stand-off detection and mobile UAV mounted remote monitoring. Just as an example, in FY04 we will use FM DIAL to detect both in-facility and outdoor release of enriched UF6. The rapid progress in FM DIAL research made in FY03 is attributed to several advances. First, final construction of a custom-designed trailer allowed the instrument to be housed in a mobile temperature-controlled environment. This allowed the experiment to be transported to several locations so that data could be collected under a range of physical conditions. This has led to a better understanding of a variety of experimental noise sources. With this knowledge, we have been able to implement several changes in the way the FM DIAL data is collected and processed, with the net result being a drastic improvement in our confidence of analyte concentration measurement and an improvement i n the instrument detection limit. The range of chemicals detectable by FM DIAL has also been extended. Prior to FY03 only water and nitrous oxide (N2O) had been seen. Experiments on extending the tuning range of the quantum cascade laser (QCL) currently used in the experiments demonstrate that many more species are now accessible including H2S, C2F4H2, and CH4. We additionally demonstrated that FM DIAL measurements can be made using short wave infrared (SWIR) telecommunications lasers. While measurements made using these components are noisier because turbulence and particulate matter cause more interference in this spectral region, monitoring in this region enables larger species to be detected simply because these lasers have a greater tuning range. In addition, SWIR monitoring also allows for the detection of second-row hydride species such as HF and HCl, which are important nuclear and CWA proliferation signatures.

Harper, Warren W.; Strasburg, Jana D.; Aker, Pam M.; Schultz, John F.

2004-01-20T23:59:59.000Z

128

A relativistic cascade for heavy ion collisions  

SciTech Connect (OSTI)

Au on Au collisions at the BNL/AGS (11.6 GeV-A/c) are expected to produce a short-lived state of matter at high baryon density. If the baryons reach sufficiently high density, they may produce a quark-gluon plasma (QGP). The signals from a QGP phase may be difficult to distinguish from those of ordinary hadronic matter. The authors have constructed a relativistic cascade (ARC) for hadrons in an attempt to model the dynamics of ordinary hadronic matter in a heavy ion collision, in the hopes that deviations from the cascade results may indicate new physics. In this contribution the authors discuss the formation of high baryon density matter, and its effect on antiproton production.

Schlagel, T.J.; Pang, Y.; Kahana, S.H.

1994-07-01T23:59:59.000Z

129

Cascade Apartments: Deep Energy Multifamily Retrofit  

SciTech Connect (OSTI)

In December of 2009-10, King County Housing Authority (KCHA) implemented energy retrofit improvements in the Cascade multifamily community, located in Kent, Washington (marine climate.)This research effort involved significant coordination from stakeholders KCHA, WA State Department of Commerce, utility Puget Sound Energy, and Cascade tenants. This report focuses on the following three primary BA research questions : 1. What are the modeled energy savings using DOE low income weatherization approved TREAT software? 2. How did the modeled energy savings compare with measured energy savings from aggregate utility billing analysis? 3. What is the Savings to Investment Ratio (SIR) of the retrofit package after considering utility window incentives and KCHA capitol improvement funding.

Gordon, A.; Mattheis, L.; Kunkle, R.; Howard, L.; Lubliner, M.

2014-02-01T23:59:59.000Z

130

Cascade-based attacks on complex networks  

Science Journals Connector (OSTI)

We live in a modern world supported by large, complex networks. Examples range from financial markets to communication and transportation systems. In many realistic situations the flow of physical quantities in the network, as characterized by the loads on nodes, is important. We show that for such networks where loads can redistribute among the nodes, intentional attacks can lead to a cascade of overload failures, which can in turn cause the entire or a substantial part of the network to collapse. This is relevant for real-world networks that possess a highly heterogeneous distribution of loads, such as the Internet and power grids. We demonstrate that the heterogeneity of these networks makes them particularly vulnerable to attacks in that a large-scale cascade may be triggered by disabling a single key node. This brings obvious concerns on the security of such systems.

Adilson E. Motter and Ying-Cheng Lai

2002-12-20T23:59:59.000Z

131

Cascade Training Technique for Particle Identification  

E-Print Network [OSTI]

The cascade training technique which was developed during our work on the MiniBooNE particle identification has been found to be a very efficient way to improve the selection performance, especially when very low background contamination levels are desired. The detailed description of this technique is presented here based on the MiniBooNE detector Monte Carlo simulations, using both artifical neural networks and boosted decision trees as examples.

Yong Liu; Ion Stancu

2006-11-27T23:59:59.000Z

132

Peculiarity of Seismicity in the Balakend-Zagatal Region, Azerbaijan  

SciTech Connect (OSTI)

The study of seismicity in the Balakend-Zagatal region demonstrates a temporal correlation of small events in the region with the moderate events in Caucasus for the time interval of 1980 to 1990. It is shown that the processes resulting in deformation and tectonic movements of main structural elements of the Caucasus region are internal and are not related to large-scale tectonic processes. A week dependence of the regional movements on the large-scale motion of the lithospheric plates and microplates is apparent from another geological and geodetic data as well.

Ismail-Zadeh, Tahir T. [Geology Institute, Azerbaijan National Academy of Sciences, 29A, H. Javid Ave., Baku 1143 (Azerbaijan)

2006-03-23T23:59:59.000Z

133

Two Dimensional Integration of Ring Cavity Surface Emitting Quantum Cascade Lasers  

SciTech Connect (OSTI)

The continual improvements over the last fifteen years have made quantum cascade lasers reliable and versatile light sources in the mid infrared and the terahertz spectral regions. In this work we present our latest results regarding the implementation of these light sources for forming broad band emitting two-dimensional laser arrays. A spectral tuning range of 180 cm{sup -1} around the centered wavelength of 8.2 {mu}m could be shown.

Schwarzer, Clemens; Mujagic, Elvis; Zederbauer, Tobias; Detz, Hermann; Andrews, Aaron M.; Schrenk, Werner; Strasser, Gottfried [Institute for Solid State Electronics, Vienna University of Technology, 1040 Vienna (Austria); Yao Yu; Chen Jianxin; Gmachl, Claire [Department of Electrical Engineering, Princeton University, Princeton, NJ 08544 (United States)

2011-12-26T23:59:59.000Z

134

EM to Proceed with Demolition Following Completion of Cascade Cleanout  

Broader source: Energy.gov (indexed) [DOE]

to Proceed with Demolition Following Completion of Cascade to Proceed with Demolition Following Completion of Cascade Cleanout Operations EM to Proceed with Demolition Following Completion of Cascade Cleanout Operations July 1, 2012 - 12:00pm Addthis X-326 Facility Manager Jack Tully, left to right, DOE Site Lead Joel Bradburne and Operator Russ Nickell stand in the local control room after the last processing equipment that had been operating in the uranium enrichment cascade at the Portsmouth site in Piketon was shut down. X-326 Facility Manager Jack Tully, left to right, DOE Site Lead Joel Bradburne and Operator Russ Nickell stand in the local control room after the last processing equipment that had been operating in the uranium enrichment cascade at the Portsmouth site in Piketon was shut down. The last equipment that had been operating in the uranium enrichment cascade at the Portsmouth site in Piketon was powered off May 30 after more than 57 years of operation.

135

CONTROL OF POLLUTANT EMISSIONS IN NATURAL GAS DIFFUSION FLAMES BY USING CASCADE BURNERS  

SciTech Connect (OSTI)

The goal of this exploratory research project is to control the pollutant emissions of diffusion flames by modifying the air infusion rate into the flame. The modification was achieved by installing a cascade of venturis around the burning gas jet. The basic idea behind this technique is controlling the stoichiometry of the flame through changing the flow dynamics and rates of mixing in the combustion zone with a set of venturis surrounding the flame. A natural gas jet diffusion flame at burner-exit Reynolds number of 5100 was examined with a set of venturis of specific sizes and spacing arrangement. The thermal and composition fields of the baseline and venturi-cascaded flames were numerically simulated using CFD-ACE+, an advanced computational environment software package. The instantaneous chemistry model was used as the reaction model. The concentration of NO was determined through CFD-POST, a post processing utility program for CFD-ACE+. The numerical results showed that, in the near-burner, midflame and far-burner regions, the venturi-cascaded flame had lower temperature by an average of 13%, 19% and 17%, respectively, and lower CO{sub 2} concentration by 35%, 37% and 32%, respectively, than the baseline flame. An opposite trend was noticed for O{sub 2} concentration; the cascaded flame has higher O{sub 2} concentration by 7%, 26% and 44%, in average values, in the near-burner, mid-flame and far-burner regions, respectively, than in the baseline case. The results also showed that, in the near-burner, mid-flame, and far-burner regions, the venturi-cascaded flame has lower NO concentrations by 89%, 70% and 70%, in average values, respectively, compared to the baseline case. The numerical results substantiate that venturi-cascading is a feasible method for controlling the pollutant emissions of a burning gas jet. In addition, the numerical results were useful to understand the thermo-chemical processes involved. The results showed that the prompt-NO mechanism plays an important role besides the conventional thermal-NO mechanism. The computational results of the present study need to be validated experimentally.

Dr. Ala Qubbaj

2001-12-30T23:59:59.000Z

136

Cascading Failures in Power Grid under Three Node Attack Strategies  

Science Journals Connector (OSTI)

This paper studies cascading failures of power grid under three node attack strategies based on...k is k ? , and ?...is a tunable parameter. We investigated the...

Sui-Min Jia; Yun-Ye Wang; Cong Feng; Zhi-Juan Jia

2014-01-01T23:59:59.000Z

137

Building America Whole-House Solutions for Existing Homes: Cascade...  

Broader source: Energy.gov (indexed) [DOE]

Building America Whole-House Solutions for Existing Homes: Cascade Apartments - Deep Energy Multifamily Retrofit (Fact Sheet) Building America Whole-House Solutions for Existing...

138

Identifying two steps in the internal wave energy cascade  

E-Print Network [OSTI]

1.1.1 The internal wave energy cascade . . . . . . .? ? , which contain only wave energy trav- eling upward anddistinction is made between wave energy propagating upward

Sun, Oliver Ming-Teh

2010-01-01T23:59:59.000Z

139

Random?walk model of isotope enrichment in cascades  

Science Journals Connector (OSTI)

Steady opertional parameters such as enrichment flow rates isotopic distributions in the product and in the waste and their variation over the cascade are evaluated in terms of transit probabilities and average transit times of different gas molecules in their random walk from one stage to another of a cascade. The random?walk model is also used for describing transient properties i.e. the output response to input perturbation and the relaxation time. Calculations in terms of the model are carried out for UF6 of natural abundance enriched in a diffusion cascade. With the appropriate numerical values the model can also be applied to centrifuge cascades.

I. Kiss; Sz. Vass

1977-01-01T23:59:59.000Z

140

Active wavelength control of an external cavity quantum cascade laser  

Science Journals Connector (OSTI)

Semiconductor lasers are increasingly popular as components of high...1]. Quantum Cascade Lasers (QCLs) are particularly attractive semiconductor lasers, since their operating wavelengths in the mid...2...]. For ...

T. Tsai; G. Wysocki

2012-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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

Low-Divergence Surface-Emitting Terahertz Quantum Cascade Lasers  

Science Journals Connector (OSTI)

We investigate surface-emission via a second-order grating in terahertz quantum cascade lasers. We optimize grating design and suppress facet reflectivity with absorbing waveguide...

Fan, Jonathan; Belkin, Mikhail; Capasso, Federico; Khanna, Suraj; Lachab, Mohammed; Davies, Giles; Linfield, Edmund

142

Chirped Laser Dispersion Spectroscopy with Directly Modulated Quantum Cascade Laser  

Science Journals Connector (OSTI)

A feasibility study of chirped laser dispersion spectroscopy (CLaDS) with utilizing direct modulation of a quantum cascade laser instead of external modulators is presented....

Hangauer, Andreas; Spinner, Georg; Nikodem, Michal; Wysocki, Gerard

143

Current Injection Spiral-Shaped Chaotic Microcavity Quantum Cascade Lasers  

Science Journals Connector (OSTI)

We report room temperature operation of current-injection quantum cascade lasers with spiral-shaped chaotic microresonators, capable of directional, single mode emission, operating...

Belkin, Mikhail A; Audet, Ross M; Fan, Jonathan A; Capasso, Federico; Narimanov, Evgenii; Bour, D; Corzine, S; Zhu, J; Hfler, G

144

Hydrothermal Heat Discharge In The Cascade Range, Northwestern...  

Open Energy Info (EERE)

Heat Discharge In The Cascade Range, Northwestern United States Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Hydrothermal Heat Discharge In...

145

Contemporary Tectonic Deformation of the Basin and Range Province, Western  

Open Energy Info (EERE)

Contemporary Tectonic Deformation of the Basin and Range Province, Western Contemporary Tectonic Deformation of the Basin and Range Province, Western United States: 10 Years of Observation with the Global Positioning System Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Contemporary Tectonic Deformation of the Basin and Range Province, Western United States: 10 Years of Observation with the Global Positioning System Abstract [1] We have estimated patterns and rates of crustal movement across 800 km of the Basin and Range at ∼39° north latitude with Global Positioning System surveys in 1992, 1996, 1998, and 2002. The total rate of motion tangent to the small circle around the Pacific-North America pole of rotation is 10.4 ± 1.0 mm/yr, and motion normal to this small circle is 3.9 ± 0.9 mm/yr compared to the east end of our network. On the Colorado

146

Performance and Reliability of Quantum Cascade Lasers  

SciTech Connect (OSTI)

We present the burn-in behavior and power stability of multiple quantum cascade lasers (QCLs) that were measured to investigate their long-term performance. For these experiments, the current to the QCL was cycled every ten minutes, and the output power was monitored over time for durations as long as two months. A small increase in power for a given injection current is observed for almost all of the QCLs tested during the burn-in period. The data from these experiments will be presented along with the effects of packaging the QCLs to determine the impact on performance and reliability.

Myers, Tanya L.; Cannon, Bret D.; Taubman, Matthew S.; Bernacki, Bruce E.

2013-05-01T23:59:59.000Z

147

Spin Glass Computations and Ruelle's Probability Cascades  

E-Print Network [OSTI]

We study the Parisi functional, appearing in the Parisi formula for the pressure of the SK model, as a functional on Ruelle's Probability Cascades (RPC). Computation techniques for the RPC formulation of the functional are developed. They are used to derive continuity and monotonicity properties of the functional retrieving a theorem of Guerra. We also detail the connection between the Aizenman-Sims-Starr variational principle and the Parisi formula. As a final application of the techniques, we rederive the Almeida-Thouless line in the spirit of Toninelli but relying on the RPC structure.

Louis-Pierre Arguin

2006-08-17T23:59:59.000Z

148

Multiplicative cascades and seismicity in natural time  

Science Journals Connector (OSTI)

Natural time ? enables the distinction of two origins of self-similarity, i.e., the process memory and the process increments infinite variance. Employing multiplicative cascades in natural time, the most probable value of the variance ?1(???2?????2) is explicitly related with the parameter b of the Gutenberg-Richter law of randomly shuffled earthquake data. Moreover, the existence of temporal and magnitude correlations is studied in the original earthquake data. Magnitude correlations are larger for closer in time earthquakes, when the maximum interoccurrence time varies from half a day to 1 min.

N. V. Sarlis; E. S. Skordas; P. A. Varotsos

2009-08-11T23:59:59.000Z

149

Free Energy Cascade in Gyrokinetic Turbulence  

SciTech Connect (OSTI)

In gyrokinetic theory, the quadratic nonlinearity is known to play an important role in the dynamics by redistributing (in a conservative fashion) the free energy between the various active scales. In the present study, the free energy transfer is analyzed for the case of ion temperature gradient driven turbulence. It is shown that it shares many properties with the energy transfer in fluid turbulence. In particular, one finds a (strongly) local, forward (from large to small scales) cascade of free energy in the plane perpendicular to the background magnetic field. These findings shed light on some fundamental properties of plasma turbulence, and encourage the development of large-eddy-simulation techniques for gyrokinetics.

Banon Navarro, A.; Morel, P.; Albrecht-Marc, M.; Carati, D. [Universite Libre de Bruxelles, Faculte des Sciences, Physique Statistique et Plasmas CP 231, EURATOM Association, Campus Plaine, 1050 Brussels (Belgium); Merz, F.; Goerler, T.; Jenko, F. [Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, 85748 Garching (Germany)

2011-02-04T23:59:59.000Z

150

Tectonic history and analysis of structures in eastern Kansas and western Missouri  

SciTech Connect (OSTI)

Orogenic events in and around the midcontinent in Proterozoic time were responsible for the formation of the dominant master set of younger northeast- and older northwest-trending faults that dominate the structure of the area today. Reactivation of these faults throughout geologic time gave rise to tectonic zones consisting of sets of anastomosing faults or other complex patterns. These zones are likely important in helping to determine the configuration of major uplifts and basins that involve the crust. The Nemaha tectonic zone defines the western boundary of both the Forest City and Cherokee basins, while a structural block delineated by the Chesapeake and Bolivar-Mansfield regional faults coincides with the approximate position of the Bourbon Arch, which is reflected in the thickness of Mississippian carbonate rocks. Rocks of the Ozark uplift began to be uplifted by the end of Maquoketa time. The uplift has historically been described as a landform, rather than a geologic structure. Hence, the extent and the boundaries of the uplift are ill-defined. The northeast-trending line forming the contact between Mississippian and Pennsylvanian rocks is commonly regarded as the western boundary. This boundary coincides with a major tectonic zone, extending northeastward from Oklahoma through Kansas and Missouri into at least southern Iowa. In the Tri-State area of Kansas, Oklahoma, and Missouri the zone is referred to as the Miami trough and features prominently in the localization of major ore deposits. This zone may then also be regarded as the eastern boundary of the Forest City and Cherokee basins.

Berendsen, P.; Wilson, F.W. (Univ. of Kansas, Lawrence, KS (United States). Kansas Geological Survey)

1993-03-01T23:59:59.000Z

151

Paleozoic paleotectonics and sedimentation in southern Rocky Mountain region  

SciTech Connect (OSTI)

During the Paleozoic, the southern Rocky Mountain region included most of New Mexico and Arizona and at least the northern parts of adjacent Chihuahua and Sonora. It was particularly stable part of the North American craton during the Cambrian through Middle Devonian. Slow deposition of shelf clastics and dolomitic carbonates was interrupted by several long erosional hiatuses. Major recognizable tectonism first appeared in the Devonian with at least one depositional basin formed west of the Defiance-Zuni uplift. Thin Early Mississippian shelf carbonates and evaporites covered nearly the entire region. The most significant tectonic activities started in the late Chesterian and extended with increasing magnitude until the end of Wolfcampian time. Local basins and uplifts date from this interval and occurred in two belts. One belt was about 80 mi (130 km) wide along the western sides of the Hueco and Pedernal uplifts and along both sides of the Uncompahgre uplift. Another belt extended northwest from the Pedresoga basin into southeastern Arizona. Major tectonic events initiated the Morrowan, Atokan, and Missourian Epochs and occurred twice within the Wolfcampian Epoch. Leonardian, Guadalupian, and Ochoan Epochs were times of tectonic stability. During the Leonardian, sediments from the Uncompahgre uplift gradually covered all the other uplifts. The timing of these paleozoic tectonic events suggests a cause-effect relationship with plate-tectonic histories that brought North American and northern Europe together in the Late Devonian (Acadian orogeny) and Euramerica and northwestern Gondwana together in the Late Mississippian through Early Permian (Appalachian orogeny).

Ross, C.A.; Ross, J.R.P.

1985-05-01T23:59:59.000Z

152

Sb-free quantum cascade lasers in the 34 ?m spectral range  

Science Journals Connector (OSTI)

In this work, the design and implementation of Sb-free short wavelength strain-compensated quantum cascade lasers in the 34 ?m spectral range is presented. Due to the presence of highly strained AlAs-barrier layers, the optimization of the epitaxial growth process is firstly discussed. The used active region design is then presented together with the observed laser performance. Watt-level room temperature emission at 3.3 ?m is shown for FabryPerot devices and laser operation in pulsed mode is observed above 350 K. The laser performance is comparable with Sb-containing quantum cascade lasers. Spectral tuning of the lasers in an external cavity configuration over more than 275 cm?1 is achieved with an emission wavelength as short as 3.15 ?m. For the first time in this spectral range, results on single-mode buried heterostructure distributed feedback lasers are shown.

A Bismuto; S Riedi; B Hinkov; M Beck; J Faist

2012-01-01T23:59:59.000Z

153

Power Grid Defense Against Malicious Cascading Failure  

E-Print Network [OSTI]

An adversary looking to disrupt a power grid may look to target certain substations and sources of power generation to initiate a cascading failure that maximizes the number of customers without electricity. This is particularly an important concern when the enemy has the capability to launch cyber-attacks as practical concerns (i.e. avoiding disruption of service, presence of legacy systems, etc.) may hinder security. Hence, a defender can harden the security posture at certain power stations but may lack the time and resources to do this for the entire power grid. We model a power grid as a graph and introduce the cascading failure game in which both the defender and attacker choose a subset of power stations such as to minimize (maximize) the number of consumers having access to producers of power. We formalize problems for identifying both mixed and deterministic strategies for both players, prove complexity results under a variety of different scenarios, identify tractable cases, and develop algorithms f...

Shakarian, Paulo; Lindelauf, Roy

2014-01-01T23:59:59.000Z

154

Terahertz quantum cascade lasers based on resonant phonon scattering for depopulation  

Science Journals Connector (OSTI)

...Michael Pepper Terahertz quantum cascade lasers based on resonant phonon...development of terahertz (THz) quantum cascade lasers (QCLs), in which the depopulation...intersubband|quantum wells|quantum cascade lasers|longitudinal optical...

2004-01-01T23:59:59.000Z

155

Energy flow along the medium-induced parton cascade  

E-Print Network [OSTI]

We discuss the dynamics of parton cascades that develop in dense QCD matter, and contrast their properties with those of similar cascades of gluon radiation in vacuum. We argue that such cascades belong to two distinct classes that are characterized respectively by an increasing or a constant (or decreasing) branching rate along the cascade. In the former class, of which the BDMPS, medium-induced, cascade constitutes a typical example, it takes a finite time to transport a finite amount of energy to very soft quanta, while this time is essentially infinite in the latter case, to which the DGLAP cascade belongs. The medium induced cascade is accompanied by a constant flow of energy towards arbitrary soft modes, leading eventually to the accumulation of the initial energy of the leading particle at zero energy. It also exhibits scaling properties akin to wave turbulence. These properties do not show up in the cascade that develops in vacuum. There, the energy accumulates in the spectrum at smaller and smaller e...

Blaizot, Jean-Paul

2015-01-01T23:59:59.000Z

156

A Cascade Multilevel Inverter Using a Single DC Source  

E-Print Network [OSTI]

A Cascade Multilevel Inverter Using a Single DC Source Zhong Du1, Leon M. Tolbert2 3, John N inverter can be implemented using only a single DC power source and capacitors. A standard cascade multilevel inverter requires DC sources for 2 + 1 levels. Without requiring transformers, the scheme proposed

Tolbert, Leon M.

157

Computational Analysis of Cascading Failures in Power Networks  

E-Print Network [OSTI]

of smart grid measurement and control algorithms that can mitigate a cascade. Categories and Subject. Specifically, we consider performance metrics such as the distance between failures, the length of the cascade (under different metrics) is NP-hard. Finally, for specific graphs, we develop a fast algorithm

Shepard, Kenneth

158

Bandstructure and electronic states in terahertz quantum cascade lasers  

Science Journals Connector (OSTI)

Bandstructure and electron eigenstates in terahertz Quantum Cascade Lasers (QCLs) are studied by using the Quantum Transmitting Boundary Method (QTBM). It has several advantages compared to the commonly used Transfer Matrix Method (TMM). ... Keywords: QCL, QTBM, TMM, bandstructure, electron eigenstates, nanoscale technology, nanotechnology, quantum cascade lasers, quantum transmitting boundary methods, transfer matrix methods

Jing Tao Lu; Jun Cheng Cao

2006-06-01T23:59:59.000Z

159

1st workshop on diffusion networks and cascade analytics  

Science Journals Connector (OSTI)

Diffusion and cascades have been studied for many years in sociology, and different theoretical models have been developed. However, experimental validation has been always carried out in relatively small datasets. In recent years, with the availability ... Keywords: cascade modeling, diffusion networks

Peng Cui; Fei Wang; Hanghang Tong; Manuel Gomez Rodriguez

2014-02-01T23:59:59.000Z

160

Speculations on the Thermal and Tectonic History of the Earth  

Science Journals Connector (OSTI)

......Tritton, private communication), using water with a Prandtl number around 6, show...on a small scale in the Hawaiian lava pools, and on a larger scale in plate tectonics...shall require the equations governing the conservation of mass and energy for a compressible......

Dan McKenzie; Nigel Weiss

1975-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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

Cascade Sierra Solutions CSS | Open Energy Information  

Open Energy Info (EERE)

Sierra Solutions CSS Sierra Solutions CSS Jump to: navigation, search Name Cascade Sierra Solutions (CSS) Place Coburg, Oregon Zip 97408-1313 Product Oregon-based, non-profit organization dedicated to saving fuel and reducing emissions from heavy-duty diesel engines. Coordinates 50.263202°, 10.966202° 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":50.263202,"lon":10.966202,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

162

Highly temperature insensitive quantum cascade lasers  

SciTech Connect (OSTI)

An InP based quantum cascade laser (QCL) heterostructure emitting around 5 {mu}m is grown with gas-source molecular beam epitaxy. The QCL core design takes a shallow-well approach to maximize the characteristic temperatures, T{sub 0} and T{sub 1}, for operations above room temperature. A T{sub 0} value of 383 K and a T{sub 1} value of 645 K are obtained within a temperature range of 298-373 K. In room temperature continuous wave operation, this design gives a single facet output power of 3 W and a wall plug efficiency of 16% from a device with a cavity length of 5 mm and a ridge width of 8 {mu}m.

Bai, Y.; Bandyopadhyay, N.; Tsao, S.; Selcuk, E.; Slivken, S.; Razeghi, M. [Department of Electrical Engineering and Computer Science, Center for Quantum Devices, Northwestern University, Evanston, Illinois 60208 (United States)

2010-12-20T23:59:59.000Z

163

Conserved quantities and dual turbulent cascades in Anti-de Sitter spacetime  

E-Print Network [OSTI]

We consider the dynamics of a spherically symmetric massless scalar field coupled to general relativity in Anti--de Sitter spacetime in the small-amplitude limit. Within the context of our previously developed two time framework (TTF) to study the leading self-gravitating effects, we demonstrate the existence of two new conserved quantities in addition to the known total energy $E$ of the modes: The particle number $N$ and Hamiltonian $H$ of our TTF system. $H$ represents the next-order contribution after $E$ to the total ADM mass $M$. Simultaneous conservation of $E$ and $N$ implies that weak turbulent processes undergo dual cascades (direct cascade of $E$ and inverse cascade of $N$ or vice versa). This partially explains the observed dynamics of 2-mode initial data. In addition, conservation of $E$ and $N$ limits the region of phase space that can be explored within the TTF approximation and in particular rules out equipartion of energy among the modes for general initial data. Finally, we discuss possible effects of conservation of $N$ and $E$ on late time dynamics.

Alex Buchel; Stephen R. Green; Luis Lehner; Steve L. Liebling

2014-12-15T23:59:59.000Z

164

Conserved quantities and dual turbulent cascades in Anti-de Sitter spacetime  

E-Print Network [OSTI]

We consider the dynamics of a spherically symmetric massless scalar field coupled to general relativity in Anti--de Sitter spacetime in the small-amplitude limit. Within the context of our previously developed two time framework (TTF) to study the leading self-gravitating effects, we demonstrate the existence of two new conserved quantities in addition to the known total energy $E$ of the modes: The particle number $N$ and Hamiltonian $H$ of our TTF system. Simultaneous conservation of $E$ and $N$ implies that weak turbulent processes undergo dual cascades (direct cascade of $E$ and inverse cascade of $N$ or vice versa). This partially explains the observed dynamics of 2-mode initial data. In addition, conservation of $E$ and $N$ limits the region of phase space that can be explored within the TTF approximation and in particular rules out equipartion of energy among the modes for general initial data. Finally, we discuss possible effects of conservation of $N$ and $E$ on late time dynamics.

Alex Buchel; Stephen R. Green; Luis Lehner; Steven L. Liebling

2015-02-17T23:59:59.000Z

165

Cascade Natural Gas - Conservation Incentives for New Homes | Department of  

Broader source: Energy.gov (indexed) [DOE]

Cascade Natural Gas - Conservation Incentives for New Homes Cascade Natural Gas - Conservation Incentives for New Homes Cascade Natural Gas - Conservation Incentives for New Homes < Back Eligibility Residential Savings Category Home Weatherization Commercial Weatherization Heating & Cooling Construction Commercial Heating & Cooling Design & Remodeling Sealing Your Home Ventilation Heating Appliances & Electronics Water Heating Program Info State District of Columbia Program Type Utility Rebate Program Rebate Amount High Efficiency Natural Gas Furnace: $150 High Efficiency Natural Gas Hearth: $70 Conventional Natural Gas Water Heater: $40 Condensing Tankless Water Heater: $200 Combined Domestic Water/Hydronic Space Heating System (usingTankless Water Heater): $800 Energy Star Certified Home: $350 Energy Star Certified Plus Home: $750

166

Superconvergence of period doubling cascade in trapezoid maps  

E-Print Network [OSTI]

In the symmetric and the asymmetric trapezoid maps, as a slope of the trapezoid is increased, the period doubling cascade occurs and the symbolic sequence of periodic points is the Metropolis-Stein-Stein sequence and the convergence of the onset point of the period 2^m solution to the accumulation point is exponentially fast. We reported these results previously. In this paper, we give the detailed description of the proof on the results. Further, we study the period doubling cascade starting from period p solution and show the superconvergence of the period doubling cascade.

T. Uezu

2000-01-12T23:59:59.000Z

167

Design and preliminary testing of a thermionic AMTEC cascade  

SciTech Connect (OSTI)

This paper describes the design of an experiment to demonstrate the feasibly of operating a cascade of a Thermionic Energy Converter (TEC) with an Alkali Metal Thermo Electric Converter (AMTEC). Both of these devices convert heat to electricity without moving mechanical parts and lend themselves to be incorporated into a cascade. Typically, the TEC operates from a hot temperature of 2000 K to 1700 K, rejecting heat at 1100 K to 700 K, while the AMTEC operates from a hot temperature of 1100 K to 900 K and a cold temperature of about 400 K. These temperature ranges form almost ideal cascade. {copyright} {ital 1996 American Institute of Physics.}

Miskolczy, G. [Thermo Trex Corp., 85 First Avenue, Waltham, Massachusetts 02254 (United States); Sievers, B.; Svedberg, B. [Advanced Modular Power Systems, Inc., 4667 Freedom Drive, Ann Arbor, Michigan 48108 (United States); Schuller, M. [Phillips Laboratory/VTPN, Kirtland Air Force Base, New Mexico 87117 (United States); VanHagen, T.; Smith, J. [General Atomics, 3550 General Atomics Court, San Diego, California 92121-1194 (United States); Reiners, E.; LeMire, R. [ORION International Technologies, Inc., 6501 Americas Parkway NE, Suite 200, Albuquerque, New Mexico 87110 (United States)

1996-03-01T23:59:59.000Z

168

Tectonic evolution of the southwestern Black Sea margin, offshore Turkey  

E-Print Network [OSTI]

(continued) Page around the Aegean Sea. 39 Isopach map of the Middle-Upper Miocene sediments in the southwestern Black Sea Basin. 75 78 LIST OF TABLES TABLE I Internal seismic reflection configurations of the seismic stratigraphic units. Page 45...). Results of the most recent offshore research project (Finetti et al. , 1988), which covers the entire Black Sea basin, also support the back-arc basin model. In this study, 2D seismic reflection profiles are used to model the tectonic evolution...

Can, Emrah

2012-06-07T23:59:59.000Z

169

High-resolution emission spectra of pulsed terahertz quantum-cascade lasers  

SciTech Connect (OSTI)

The spectra of pulsed terahertz quantum-cascade lasers were measured with high spectral resolution. The characteristic line width at half maximum was 0.01 cm{sup -1}; it is controlled by laser temperature variations during the supply voltage pulse. It was shown that an increase in the laser temperature leads to a decrease in the emission frequency, which is caused by an increase in the effective refractive index of the active region. It was also found that a decrease in the supply voltage results in a decrease in the emission frequency, which is caused by a change in the energy of diagonal transitions between lasing levels.

Ikonnikov, A. V., E-mail: antikon@ipm.sci-nnov.ru; Antonov, A. V.; Lastovkin, A. A.; Gavrilenko, V. I. [Russian Academy of Sciences, Institute for Physics of Microstructures (Russian Federation); Sadof'ev, Yu. G.; Samal, N. [Trion Technology (United States)

2010-11-15T23:59:59.000Z

170

Angular correlation of K-L x-ray cascades in gadolinium  

Science Journals Connector (OSTI)

Angular correlation parameters (A22) between the K?1 and L3 x rays were measured for gadolinium in the electron-capture decay of the isotope Tb157. The results are A22(K?1-Ll)=0.2720.042, A22(K?1-L?)=0.0320.015, A22(K?1-L?2,15)=0.0610.018. These values are in very good agreement with the theoretical calculations of Scofield [Lawrence Livermore Laboratory Report No. UCRL 51231, 1972 (unpublished)]; however, they differ from the earlier experimental data for the K?1-Ll cascade in the 60region.

T. Papp, J. L. Campbell, and S. Raman

1994-02-01T23:59:59.000Z

171

EA-1893: Canby Cascaded Geothermal Development System, Canby, California |  

Broader source: Energy.gov (indexed) [DOE]

93: Canby Cascaded Geothermal Development System, Canby, 93: Canby Cascaded Geothermal Development System, Canby, California EA-1893: Canby Cascaded Geothermal Development System, Canby, California Summary This EA will evaluate the environmental impacts of a proposal by Modoc Contracting Company to use DOE grant funds to fulfill its plan to expand its reliance on geothermal resources by producing more hot water and using it to produce power as well as thermal energy. The goal of the project is to complete a cascaded geothermal system that generates green power for the local community, provides thermal energy to support greenhouse and aquaculture operation, provide sustainable thermal energy for residential units, and eliminate the existing geothermal discharge to a local river. NOTE: NOTE: This EA has been cancelled.

172

MHK Technologies/Oscillating Cascade Power System OCPS | Open Energy  

Open Energy Info (EERE)

Oscillating Cascade Power System OCPS Oscillating Cascade Power System OCPS < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Oscillating Cascade Power System OCPS.jpg Technology Profile Primary Organization New Energy Solutions LLC Technology Resource Click here Current Technology Type Click here Oscillating Wave Surge Converter Technology Readiness Level Click here TRL 5 6 System Integration and Technology Laboratory Demonstration Technology Description The OCPS generator consists of a cascade of vertical hydrofoils submerged in moving water This array of hydrofoils oscillates in antiphase at resonance flutter in a slow swimming motion resulting in maximum power transfer from flowing water to electricity The system efficiently converts the oscillating mechanical energy into a steady electric current A 60 overall water to wire efficiency was demonstrated at the proof of concept test and 65 or better overall efficiency is projected using the new engineering advances incorporated since the test in the commercial model

173

Statistical analysis of cascading failures in power grids  

SciTech Connect (OSTI)

We introduce a new microscopic model of cascading failures in transmission power grids. This model accounts for automatic response of the grid to load fluctuations that take place on the scale of minutes, when optimum power flow adjustments and load shedding controls are unavailable. We describe extreme events, caused by load fluctuations, which cause cascading failures of loads, generators and lines. Our model is quasi-static in the causal, discrete time and sequential resolution of individual failures. The model, in its simplest realization based on the Directed Current description of the power flow problem, is tested on three standard IEEE systems consisting of 30, 39 and 118 buses. Our statistical analysis suggests a straightforward classification of cascading and islanding phases in terms of the ratios between average number of removed loads, generators and links. The analysis also demonstrates sensitivity to variations in line capacities. Future research challenges in modeling and control of cascading outages over real-world power networks are discussed.

Chertkov, Michael [Los Alamos National Laboratory; Pfitzner, Rene [Los Alamos National Laboratory; Turitsyn, Konstantin [Los Alamos National Laboratory

2010-12-01T23:59:59.000Z

174

Characterization of mid-infrared quantum cascade lasers  

E-Print Network [OSTI]

Quantum cascade lasers provide some of the highest output powers available for light in the mid-infrared range (from 3 to 8 m). As many of their applications require portability, designs that have a high wall-plug efficiency ...

Burghoff, David Patrick

2009-01-01T23:59:59.000Z

175

Cascading Goals and Objectives to Ensure Accountability and Action  

E-Print Network [OSTI]

Bristol-Myers Squibb Worldwide Beauty Care Group has adopted a methodology that is reaping benefits throughout the company. The underlying principle in cascading goals and objectives is that every employee is accountable for achieving any corporate...

Tarifi, M.; Bingham, P. R.

176

Theoretical and computational design of terahertz frequency quantum cascade lasers  

Science Journals Connector (OSTI)

Modeling of terahertz frequency quantum cascade lasers has become increasingly complex theoretically resulting in burdensome computational requirements. While more comprehensive treatment permits further insight and increased accuracy the modeling of ...

Adam T. Cooney / A.M. Sarangan

2009-01-01T23:59:59.000Z

177

Spectroscopic detection of biological NO with a quantum cascade laser  

Science Journals Connector (OSTI)

Two configurations of a continuous wave quantum cascade distributed feedback laser-based gas sensor for the detection of ... of biomedical applications, have been investigated. The laser was operated at liquid ni...

L. Menzel; A.A. Kosterev; R.F. Curl; F.K. Tittel; C. Gmachl

2001-05-01T23:59:59.000Z

178

Open-path ozone detection by quantum-cascade laser  

Science Journals Connector (OSTI)

Open-path ozone measurements performed by mid-IR differential absorption spectroscopy are reported. Ozone spectrum was taken by fast repetitive sweeping of a quantum-cascade laser wavelength over a spectral featu...

M. Taslakov; V. Simeonov; M. Froidevaux; H. van den Bergh

2006-03-01T23:59:59.000Z

179

Mathematical modeling for a thermionic-AMTEC cascade system  

SciTech Connect (OSTI)

A mathematical modeling of a system consisting of a cascade of a thermionic energy conversion (TIEC) device and an alkali metal thermal to electrical conversion (AMTEC) device has been performed. The TIEC is heated by electron bombardment which converts heat partially into electricity and rejects the remaining. The AMTEC utilizes this reject heat of the TIEC. A mathematical thermal model of the cascade converter has been developed to analyze effects of key parameters such as power level, heat fluxes, temperatures, cascade geometry, etc. In this effort, a 9-node system of nonlinear simultaneous equations has been constructed which is solved by MATHCAD predicting the temperatures of the principal components and the heat flow. Through this study, a better understanding of the thermal coupling of the two converters was gained which helps to produce a more efficient cascade. {copyright} {ital 1996 American Institute of Physics.}

Lodhi, M.A. [Department of Physics, Texas Tech University, Lubbock, Texas 79409 (United States); Schuller, M.; Hausgen, P. [Phillips Laboratory, Kirtland AFB, New Mexico 87117 (United States)

1996-03-01T23:59:59.000Z

180

Characterization and analysis of highly diagonal Terahertz Quantum Cascade Lasers  

E-Print Network [OSTI]

The as yet unattained milestone of room-temperature operation is essential for establishing Terahertz Quantum Cascade Lasers (THz QCLs) as practical sources of THz radiation. Temperature performance is hypothesized to be ...

Chan, Chun Wang Ivan

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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

Heat flux dynamics in dissipative cascaded systems  

E-Print Network [OSTI]

We study the dynamics of heat flux in the thermalization process of a pair of identical quantum system that interact dissipatively with a reservoir in a {\\it cascaded} fashion. Despite the open dynamics of the bipartite system S is globally Lindbladian, one of the subsystems "sees" the reservoir in a state modified by the interaction with the other subsystem and hence it undergoes a non-Markovian dynamics. As a consequence, the heat flow exhibits a non-exponential time behaviour which can greatly deviate from the case where each party is independently coupled to the reservoir. We investigate both thermal and correlated initial states of $S$ and show that the presence of correlations at the beginning can considerably affect the heat flux rate. We carry out our study in two paradigmatic cases -- a pair of harmonic oscillators with a reservoir of bosonic modes and two qubits with a reservoir of fermionic modes -- and compare the corresponding behaviours. In the case of qubits and for initial thermal states, we find that the trace distance discord is at any time interpretable as the correlated contribution to the total heat flux.

Salvatore Lorenzo; Alessandro Farace; Francesco Ciccarello; G. Massimo Palma; Vittorio Giovannetti

2014-12-19T23:59:59.000Z

182

The Cascaded Humidified Advanced Turbine (CHAT)  

SciTech Connect (OSTI)

This paper introduces the Cascaded Humidified Advanced Turbine (CHAT) plant, a gas turbine based power generation plant utilizing intercooling, reheat, and humidification. It is based upon the integration of an existing heavy duty gas turbine with an additional shaft comprising industrial compressors and high pressure expander. CHAT capitalizes on the latest proven gas turbine technology, which, combined with a sophisticated thermal cycle configuration, results in substantial improvement in gas turbine efficiency, compared to a simple cycle, while still maintaining typical advantages and merits of a combustion turbine plant. Built with a commercial combustion turbine and available industrial compressors and expanders, the CHAT plant does not require extensive product development and testing. As a result, the CHAT power plant can be offered with specific capital costs up to 20 percent lower than the combined cycle plant, and with competing efficiency. Compared to a combined cycle plant, the CHAT plant offers lower emissions (due to air humidification) and other significant operating advantages with regard to start-up time and costs, better efficiency at part load, lower power degradation at higher ambient temperatures, and simpler operations and maintenance due to elimination of the complexities and costs associated with steam production. The CHAT plant also integrates very effectively with coal gasification and particularly well with the water quench design. This feature has been discussed in previous publications.

Nakhamkin, M.; Swensen, E.C. [Energy Storage and Power Consultants, Inc., Mountainside, NJ (United States); Wilson, J.M.; Gaul, G. [Westinghouse Electric Corp., Orlando, FL (United States); Polsky, M. [Polsky Energy Corp., Northbrook, IL (United States)

1996-07-01T23:59:59.000Z

183

Proton heating by parallel Alfven wave cascade  

SciTech Connect (OSTI)

In a recent series of papers, the present authors developed a kinetic theory for low-frequency turbulence propagating parallel to the ambient magnetic field. Making use of this theory, it was shown that low-frequency Alfvenic turbulence may cascade to ion-cyclotron frequency range and beyond by nonlinear three-wave decay processes. The significance of such a finding is that it may lead to the proton heating by cyclotron resonance. However, the actual proton heating process was not demonstrated. The present paper complements the previous works by including the proton heating in the discussion. It is found that the left-hand circularly polarized Alfven-cyclotron turbulence leads to a moderate heating of the protons in the perpendicular direction and cooling in the parallel direction. It is also found that ion-acoustic turbulence is generated by the decay instability process. Finally, the heating rate is shown to increase in inverse proportion to the time scale of the wave source.

Yoon, P. H.; Fang, T.-M. [Massachusetts Technological Laboratory, Inc., 330 Pleasant Street, Belmont, Massachusetts 02478 (United States)

2009-06-15T23:59:59.000Z

184

Poincare recurrence and spectral cascades in three-dimensional quantum turbulence  

SciTech Connect (OSTI)

The time evolution of the ground state wave function of a zero-temperature Bose-Einstein condensate (BEC) gas is well described by the Hamiltonian Gross-Pitaevskii (GP) equation. Using a set of appropriately interleaved unitary collision-stream operators, a qubit lattice gas algorithm is devised, which on taking moments, recovers the Gross-Pitaevskii (GP) equation under diffusion ordering (time scales as length{sup 2}). Unexpectedly, there is a class of initial states whose Poincare recurrence time is extremely short and which, as the grid resolution is increased, scales with diffusion ordering (and not as length{sup 3}). The spectral results of J. Yepez et al.[Phys. Rev. Lett. 103, 084501 (2009).] for quantum turbulence are revised and it is found that it is the compressible kinetic energy spectrum that exhibits three distinct spectral regions: a small-k classical-like Kolmogorov k{sup -5/3}, a steep semiclassical cascade region, and a large-k quantum vortex spectrum k{sup -3}. For most evolution times the incompressible kinetic energy spectrum exhibits a somewhat robust quantum vortex spectrum of k{sup -3} for an extended range in k with a k{sup -3.4} spectrum for intermediate k. For linear vortices of winding number 1 there is an intermittent loss of the quantum vortex cascade with its signature seen in the time evolution of the kinetic energy E{sub kin}(t), the loss of the quantum vortex k{sup -3} spectrum in the incompressible kinetic energy spectrum as well as the minimalization of the vortex core isosurfaces that would totally inhibit any Kelvin wave vortex cascade. In the time intervals around these intermittencies the incompressible kinetic energy also exhibits a multicascade spectrum.

Vahala, George; Zhang Bo [Department of Physics, William and Mary, Williamsburg, Virginia 23185 (United States); Yepez, Jeffrey [Air Force Research Laboratory, Hanscom Air Force Base, Massachusetts 01731 (United States); Vahala, Linda [Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, Virginia 23529 (United States); Soe, Min [Department of Mathematics and Physical Sciences, Rogers State University, Claremore, Oklahoma 74017 (United States); Ziegeler, Sean [High Performance Technologies, Inc., Reston, Virginia 20190 (United States)

2011-10-15T23:59:59.000Z

185

Aeration efficiency over stepped cascades: Better predictions from flow regimes  

Science Journals Connector (OSTI)

Abstract Stepped cascades are recognized as high potential airwater gas exchangers. In natural rivers, these structures enhance oxygen transfer to water by creating turbulence at interface with increasing air entrainment in water and airwater surface exchange. Stepped cascades could be really useful to improve the natural self-purification process by providing oxygen to aerobic micro-organisms. The aeration performance of these structures depends on several operating and geometrical parameters. In the literature, several empirical correlations for aeration efficiency prediction on stepped cascades exist. Most of these correlations are only applicable for operating and geometrical parameters in the range of which they have been developed. In this paper, 398 experimental sets of data (from our experiments and collected from literature) were used to develop a correlation for aeration prediction over stepped cascades derived from dimensional analysis and parameterized for each individual flow regime in order to consider change in flow regime effect on oxygen transfer. This new correlation allowed calculating the whole set of data obtained for cascades with steps heights between 0.05m and 0.254m, cascade total height between 0.25m and 2.5m, for discharges per unit of width ranging from 0.28 10?3m2/s to 600 10?3m2/s and for cascade steps number between 3 and 25. In these ranges of parameters, standard deviation for aeration efficiency estimation was found to be less than 17%. Finally, advices were proposed to help and improve the structure design in order to improve aeration.

Hatem Khdhiri; Olivier Potier; Jean-Pierre Leclerc

2014-01-01T23:59:59.000Z

186

Sequence stratigraphy, paleoclimate, and tectonics of coal-bearing strata  

SciTech Connect (OSTI)

The origin of coal-bearing strata has been debated vigorously for more than a century, and with the emergence of coalbed methane as a major energy resource and the possibility of sequestering greenhouse gas in coal, this debate has never been more relevant. This volume contains 10 chapters on coal-bearing strata of Carboniferous through Tertiary age and is based on a special session that was held at an AAPG Annual Meeting in New Orleans. Contributors have employed a multitude of approaches ranging from basin analysis to plant taphonomy to support a variety of views on the sequence stratigraphy, paleoclimate, and tectonics of coal-bearing strata.

Jack C. Pashin; Robert A. Gastaldo (eds.)

2004-07-15T23:59:59.000Z

187

MATCASC: A tool to analyse cascading line outages in power grids  

E-Print Network [OSTI]

Blackouts in power grids typically result from cascading failures. The key importance of the electric power grid to society encourages further research into sustaining power system reliability and developing new methods to manage the risks of cascading blackouts. Adequate software tools are required to better analyze, understand, and assess the consequences of the cascading failures. This paper presents MATCASC, an open source MATLAB based tool to analyse cascading failures in power grids. Cascading effects due to line overload outages are considered. The applicability of the MATCASC tool is demonstrated by assessing the robustness of IEEE test systems and real-world power grids with respect to cascading failures.

Ko, Yakup; Araujo, Nuno A M; Warnier, Martijn

2013-01-01T23:59:59.000Z

188

Canby Cascaded Project Geothermal Project | Open Energy Information  

Open Energy Info (EERE)

Canby Cascaded Project Geothermal Project Canby Cascaded Project Geothermal Project Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Development Project: Canby Cascaded Project Geothermal Project Project Location Information Coordinates 41.443888888889°, -120.87027777778° 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":41.443888888889,"lon":-120.87027777778,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

189

Cascade Natural Gas - Commercial Efficiency Rebate Program | Department of  

Broader source: Energy.gov (indexed) [DOE]

Cascade Natural Gas - Commercial Efficiency Rebate Program Cascade Natural Gas - Commercial Efficiency Rebate Program Cascade Natural Gas - Commercial Efficiency Rebate Program < Back Eligibility Commercial Industrial Savings Category Heating & Cooling Commercial Heating & Cooling Heating Home Weatherization Commercial Weatherization Appliances & Electronics Sealing Your Home Design & Remodeling Windows, Doors, & Skylights Water Heating Program Info State District of Columbia Program Type Utility Rebate Program Rebate Amount HVAC Unit Heater: $1.50-$3 / kBtuh input Warm Air Furnace: $3.00 / kBtuh input Direct Fired Radiant Heating: $6.50 / kBtuh input Boiler: $4.00 / kBtuh input Boiler Vent Damper: $1,000 Boiler Steam Trap: $80 DHW Energy Star Tankless Water Heaters: $60 / gpm Domestic Hot Water Tank: $2.50 / kBtuh input

190

Recent results from parton cascade and microscopic transport  

E-Print Network [OSTI]

Parton cascade is a microscopic transport approach for the study of the space-time evolution of the Quark-Gluon Plasma produced in relativistic heavy ion collisions and its experimental manifestations. In the following, parton cascade calculations on elliptic flow and thermalization will be discussed. Dynamical evolution is shown to be important for the production of elliptic flow including the scaling and the breaking of the scaling of elliptic flow. The degree of thermalization is estimated using both an elastic parton cascade and a radiative transport model. A longitudinal to transverse pressure ratio, $P_L/P_T\\approx 0.8$, is shown to be expected in the central cell in central collisions. This provides information on viscous corrections to the ideal hydrodynamical approach.

Bin Zhang

2008-09-02T23:59:59.000Z

191

Reducing Cascading Failure Risk by Increasing Infrastructure Network Interdependency  

E-Print Network [OSTI]

Increased coupling between critical infrastructure networks, such as power and communications, has important implications for the reliability and security of these networks. To understand the implications of power-communications coupling, researchers have studied interdependent network models and reported that increased coupling can increase system vulnerability [1, 2]. However, these results come from models that have substantially different mechanisms of cascading, relative to those found in actual power and communications networks. This paper reports on two sets of experiments that compare the network vulnerability implications resulting from simple topological models and models that more accurately capture the dynamics of cascading in power systems. In the first set of experiments, we compare a simple model of intra-network cascading to a power grid model and find that the power grid model reveals that power grids have a higher level of vulnerability, relative to what would be inferred from a topological ...

Korkali, Mert; Tivnan, Brian F; Hines, Paul D H

2014-01-01T23:59:59.000Z

192

Role of second trials in cascades of information over networks  

Science Journals Connector (OSTI)

We study the propagation of information in social networks. To do so, we focus on a cascade model where nodes are infected with probability p1 after their first contact with the information and with probability p2 at all subsequent contacts. The diffusion starts from one random node and leads to a cascade of infection. It is shown that first and subsequent trials play different roles in the propagation and that the size of the cascade depends in a nontrivial way on p1, p2, and on the network structure. Second trials are shown to amplify the propagation in dense parts of the network while first trials are dominant for the exploration of new parts of the network and launching new seeds of infection.

C. de Kerchove; G. Krings; R. Lambiotte; P. Van Dooren; V. D. Blondel

2009-01-30T23:59:59.000Z

193

On the Origin of Large Interstitial Clusters in Displacement Cascades  

SciTech Connect (OSTI)

Displacement cascades with wide ranges of primary knock-on atom (PKA) energy and mass in iron were simulated using molecular dynamics. New visualisation techniques are introduced to show how the shock-front dynamics and internal structure of a cascade develop over time. These reveal that the nature of the final damage is determined early on in the cascade process. We define a zone (termed 'spaghetti') in which atoms are moved to new lattice sites and show how it is created by a supersonic shock-front expanding from the primary recoil event. A large cluster of self-interstitial atoms can form on the periphery of the spaghetti if a hypersonic recoil creates damage with a supersonic shock ahead of the main supersonic front. When the two fronts meet, the main one injects atoms into the low-density core of the other: these become interstitial atoms during the rapid recovery of the surrounding crystal. The hypersonic recoil occurs in less than 0.1 ps after the primary recoil and the interstitial cluster is formed before the onset of the thermal spike phase of the cascade process. The corresponding number of vacancies is then formed in the spaghetti core as the crystal cools, i.e. at times one to two orders of magnitude longer. By using the spaghetti zone to define cascade volume, the energy density of a cascade is shown to be almost independent of the PKA mass. This throws into doubt the conventional energy-density interpretation of an increased defect yield with increasing PKA mass in ion irradiation.

Andrew, Calder F [University of Liverpool; Barashev, Aleksandr [University of Liverpool; Bacon, David J [University of Liverpool; Osetskiy, Yury N [ORNL

2010-01-01T23:59:59.000Z

194

Maximum earthquake magnitudes in the Aegean area constrained by tectonic moment release rates  

Science Journals Connector (OSTI)

......smoothing (low-pass filtering) involved...seismic deformation rates are dominated by...tectonic moment release rate. This paper is published...seismometers at Cajon Pass, southern California...1996. Statistical physics, seismogenesis and...tectonic seismic release rates, Bull. seism......

G. Ch. Koravos; I. G. Main; T. M. Tsapanos; R. M. W. Musson

2003-01-01T23:59:59.000Z

195

On the Forces Driving Plate Tectonics: Inferences from Absolute Plate Velocities and Intraplate Stress  

Science Journals Connector (OSTI)

......Thermal expansion, in Handbook of Physical Constants...42, 769-801 On the Forces Driving Plate Tectonics...Europe unless the driving force exerted at ridges is...in magnitude to other forces in the system. The mid-plate...plates is one of the fundamental tenets of plate tectonics......

Sean C. Solomon; Norman H. Sleep; Randall M. Richardson

1975-08-01T23:59:59.000Z

196

Your Mission: To become familiar with the major plate boundaries through exploration of plate tectonic features using Google Earth.  

E-Print Network [OSTI]

boundaries through exploration of plate tectonic features using Google Earth. Your Supplies: (1) A computer with internet access and the Google Earth program of Earth's tectonic plates using Google Earth. To do this, login

Smith-Konter, Bridget

197

Atomic Cascade in Muonic and Hadronic Hydrogen Atoms  

E-Print Network [OSTI]

The atomic cascade in $\\mu^- p$ and $\\pi^- p$ atoms has been studied with the improved version of the extended cascade model in which new quantum mechanical calculations of the differential and integral cross sections of the elastic scattering, Stark transitions and Coulomb de-excitation have been included for the principal quantum number values $n\\le 8$ and the relative energies $E \\ge 0.01$ eV. The $X$-ray yields and kinetic energy distributions are compared with the experimental data.

T. S. Jensen; V. P. Popov; V. N. Pomerantsev

2007-12-18T23:59:59.000Z

198

Ultrafast population dynamics in electrically modulated terahertz quantum cascade lasers  

Science Journals Connector (OSTI)

The ultrafast population dynamics in electrically modulated three-well terahertz quantum cascade lasers (QCLs) is studied by using the self-consistent BlochPoisson equations. In the modulation process, the non-equilibrium oscillations of the population inversion are found before the population equilibrium recovers. The equilibrium formation time increases nonlinearly with the period number. This phenomenon stems from the non-uniform distribution of the electric potential. In different periods, different responses to the electrical modulation are also explored. An in-depth understanding of electron transport in the cascade structure is obtained. Finally, we demonstrate the feasibility of a modulation frequency up to gigahertz in terahertz QCLs.

F Wang; X G Guo; C Wang; J C Cao

2013-01-01T23:59:59.000Z

199

Rapid Cascade Synthesis of Poly-Heterocyclic Architectures from Indigo  

Science Journals Connector (OSTI)

Bubbling CO2 gas through a standard reaction (entry 3) resulted in a 6% yield of 8, however, the most significant outcome from this reaction is the notably reduced yields of 4, 5, 6, and 7, and a dramatic increase in the production of noncharacterizable baseline material. ... There have been reported syntheses of these natural products including the silver-catalyzed cascade synthesis of their parent compound and analogs, with this approach involving the initial intermolecular reaction of two components of similar molecular complexity, however, this necessitated the prior synthesis of these two components. ... Branching Cascades: A Concise Synthetic Strategy Targeting Diverse and Complex Molecular Frameworks ...

Alireza Shakoori; John B. Bremner; Anthony C. Willis; Rachada Haritakun; Paul A. Keller

2013-06-26T23:59:59.000Z

200

Seed size strongly affects cascades on random networks  

Science Journals Connector (OSTI)

The average avalanche size in the Watts model of threshold dynamics on random networks of arbitrary degree distribution is determined analytically. Existence criteria for global cascades are shown to depend sensitively on the size of the initial seed disturbance. The dependence of cascade size upon the mean degree z of the network is known to exhibit several transitionsthese are typically continuous at low z and discontinuous at high z; here it is demonstrated that the low-z transition may in fact be discontinuous in certain parameter regimes. Connections between these results and the zero-temperature random-field Ising model on random graphs are discussed.

James P. Gleeson and Diarmuid J. Cahalane

2007-05-03T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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

Cenozoic tectonic and geomorphic evolution of the Red River Region, Yunnan Province, China  

E-Print Network [OSTI]

(cont.) Xianshuihe-Xiaojiang fault system during growth of the southeast plateau margin. Cosmogenic ?A1 and ?Be basin-wide erosion rate and burial ages indicate a background incision rate of [approximately] 0.05 to 0.10 ...

Schoenbohm, Lindsay M. (Lindsay Marie), 1976-

2004-01-01T23:59:59.000Z

202

Seismic stratigraphy and salt tectonics of the East Breaks region, Gulf of Mexico  

E-Print Network [OSTI]

and Pleistocene inter~ale. Analysis of these maps suggests that a north-south trending depositional trough parallels the western edge of the massive dome province. Isochron interval maps show that the prograding Pleistocene shelf margin causes asymmetric... due to separate episodes of dome growth (Seni and Jackson, 1984), and updip movement of salt (Jenyon, 1985). Model studies (Nettleton, 1934; Parker and McDowell, 1955; Withjack and Scheiner, 1982; Lemon, 1985) have been used to simulate several...

Gardiner, Wayne Bartlett

2012-06-07T23:59:59.000Z

203

Shallow hydraulic fracturing measurements in Korea support tectonic and seismic indicators of regional stress.  

SciTech Connect (OSTI)

We have conducted five hydraulic fracturing stress measurement campaigns in Korea, involving 13 test holes ranging in depth from 30 to 250 m, at locations from North Seoul to the southern coast of the peninsula. The measurements reveal consistent crustal stress magnitudes and directions that suggest persistence throughout western and southern Korea. The maximum horizontal stress {sigma}{sub H} is oriented between ENE-WSW and E-W, in accord with plate movement and deformation, and with directions indicated by both focal mechanism solutions from earthquakes inland and offshore as well as borehole breakouts in mainland China close to its eastern coast. With respect to magnitudes, the vertical stress is the overall minimum stress at all tested locations, suggesting a thrust faulting regime within the relatively shallow depths reached by our tests. Typically, such a stress regime becomes one favoring strike-slip at greater depths, as is also indicated by the focal mechanism solutions around Korea.

Haimson, Bezalel Cecil (University of Wisconsin, Madison, WI); Lee, Moo Yul; Song, I. (Ruhr-University Bochum, Bochum, Germany)

2003-07-01T23:59:59.000Z

204

Tectonics of the Persian Gulf, Gulf of Oman, and Southern Pakistan Region  

Science Journals Connector (OSTI)

The Persian Gulf has major economic importance because of oil ... , the two geological provinces which border the Persian Gulf (Fig. 1). Bordering the Gulf of Oman on the east are the...

Kees A. De Jong

1982-01-01T23:59:59.000Z

205

E-Print Network 3.0 - atmospheric neutrino-induced cascades Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Fly's Eye Project Collection: Physics 6 SEARCH FOR NEUTRINO-INDUCED CASCADES FROM GAMMA-RAY BURSTS WITH AMANDA A. Achterberg,1 Summary: SEARCH FOR NEUTRINO-INDUCED CASCADES FROM...

206

Rhodium-catalyzed epoxide-opening cascades toward brevisin and hemibrevetoxin B  

E-Print Network [OSTI]

CHAPTER I. Rhodium-Catalyzed Epoxide-Opening Cascades: Formal Synthesis of (-)-Brevisin [chemical formula inserted] [Rh(CO)?Cl]? was found to be an effective catalyst for endo-selective cyclizations and cascades of ...

Armbrust, Kurt W. (Kurt Willes)

2014-01-01T23:59:59.000Z

207

Cascaded H-Bridge MV Grid and Power Balance Control for PV Systems  

Science Journals Connector (OSTI)

In this paper, a new centralized cascaded H-bridge medium-voltage (MV) grid topology model ... array partial shading or module mismatch of Cascaded H-Bridge is analyzed as well, based on which ... quality, solves...

Bin Zhang; Zhiyun Bao; Donglai Zhang

2014-01-01T23:59:59.000Z

208

Quantum Cascade Lasers: New Resonant Tunnelling Light Sources for the Mid-Infrared  

Science Journals Connector (OSTI)

15 October 1996 research-article Quantum Cascade Lasers: New Resonant Tunnelling Light Sources...Hutchinson A. Y. Cho Recent results on quantum cascade lasers are reviewed. In these quantum devices based on resonant tunnelling the...

1996-01-01T23:59:59.000Z

209

APPLYING CASCADED PARAMETER SCAN TO STUDY TOP-OFF SAFETY IN NSLS-II STORAGE RING  

SciTech Connect (OSTI)

In this paper we introduce a new algorithm, the cascaded parameter scan method, to efficiently carry out the scan over magnet parameters in the safety analysis for storage ring top-off injection. In top-off safety analysis, one must track particles populating phase space through a beamline containing magnets and apertures and clearly demonstrate that for all possible magnet settings and errors, all particles are lost on scrapers within the properly shielded region. In the usual approach, the number of tracking runs increases exponentially with the number of magnet settings. In the cascaded parameter scan method, the number of tracking runs only increases linearly. This reduction of exponential to linear dependence on the number of set-points, greatly reduces the required computation time and allows one to more densely populate phase space and to increase the number of set-points scanned for each magnet. An example of applying this approach to analyze an NSLS-II beamline, the damping wiggler beamline, is also given.

Li, Y.

2011-03-28T23:59:59.000Z

210

Shear Viscosity to Entropy within a Parton Cascade  

E-Print Network [OSTI]

The shear viscosity is calculated by means of the perturbative kinetic partonic cascade BAMPS with CGC initial conditons for various saturation momentum scale Q_s. eta/s ~ 0.15 stays approximately constant when going from RHIC to LHC.

A. El; C. Greiner; Z. Xu

2007-06-28T23:59:59.000Z

211

Hybrid Cascaded Multilevel Inverter with PWM Control Method  

E-Print Network [OSTI]

162 Hybrid Cascaded Multilevel Inverter with PWM Control Method Haiwen Liu1 , Leon M. Tolbert1, 2 inverter with PWM method is presented in this paper. It consists of a standard 3-leg inverter (one leg for each phase) and H-bridge in series with each inverter leg. It can use only a single DC power source

Tolbert, Leon M.

212

Monitoring of ethylene by a pulsed quantum cascade laser  

E-Print Network [OSTI]

Monitoring of ethylene by a pulsed quantum cascade laser Damien Weidmann, Anatoliy A. Kosterev ethylene C2H4 concentrations by use of a rotational component of the fundamental 7 band. The laser.5960, 300.6320. 1. Introduction The detection of ethylene C2H4 at trace levels is important in a number

213

Superconducting cascade electron refrigerator M. Camarasa-Gomez,1  

E-Print Network [OSTI]

arranged in a symmetric configuration, i.e. S2IS1INIS1IS2, as displayed in Fig. 1(a). The structure) S2IS1 INIS1 IS2 cascade cooler geometry. The optional el- ements contained into the two dashed boxes

Paris-Sud XI, Université de

214

Unraveling the Mechanism of Cascade Reactions of Zincke Aldehydes  

Science Journals Connector (OSTI)

Unraveling the Mechanism of Cascade Reactions of Zincke Aldehydes ... Department of Chemistry, University of California, Irvine, 1102 Natural Sciences II, Irvine, California 92697-2025, United States ... The E/Z conformational preferences (gas phase and soln.), rotational barriers, and IR spectra of ?-oxo ketenes are also reported. ...

Robert S. Paton; Sarah E. Steinhardt; Christopher D. Vanderwal; K. N. Houk

2011-02-25T23:59:59.000Z

215

Optimizing protections against cascades in network systems: a modified binary  

E-Print Network [OSTI]

to the topology of an electricity infrastructure, i.e. the 380 kV Italian power transmission network. We only protection; line switching; cascading failure; differential evolution algorithm; multi-objective optimization protection (NP) by line switching, done automatically or by a system operator, following an attack

Paris-Sud XI, Université de

216

Cascade-induced synchrony in stochastically driven neuronal networks  

Science Journals Connector (OSTI)

Perfect spike-to-spike synchrony is studied in all-to-all coupled networks of identical excitatory, current-based, integrate-and-fire neurons with delta-impulse coupling currents and Poisson spike-train external drive. This synchrony is induced by repeated cascading total firing events, during which all neurons fire at once. In this regime, the network exhibits nearly periodic dynamics, switching between an effectively uncoupled state and a cascade-coupled total firing state. The probability of cascading total firing events occurring in the network is computed through a combinatorial analysis conditioned upon the random time when the first neuron fires and using the probability distribution of the subthreshold membrane potentials for the remaining neurons in the network. The probability distribution of the former is found from a first-passage-time problem described by a Fokker-Planck equation, which is solved analytically via an eigenfunction expansion. The latter is found using a central limit argument via a calculation of the cumulants of a single neuronal voltage. The influence of additional physiological effects that hinder or eliminate cascade-induced synchrony are also investigated. Conditions for the validity of the approximations made in the analytical derivations are discussed and verified via direct numerical simulations.

Katherine A. Newhall; Gregor Kova?i?; Peter R. Kramer; David Cai

2010-10-01T23:59:59.000Z

217

Optimal adaptive control of cascading power grid failures1 Version 2010-Dec-20  

E-Print Network [OSTI]

Optimal adaptive control of cascading power grid failures1 Version 2010-Dec-20 Daniel Bienstock Columbia University New York 1 Introduction Power grids have long been a source of interesting optimization, the central modeling ingredient is that power grids display cascading behavior. A cascade is the process

Bienstock, Daniel

218

Capacitor Voltage Control in a Cascaded Multilevel Inverter as a Static Var Generator  

E-Print Network [OSTI]

1 Capacitor Voltage Control in a Cascaded Multilevel Inverter as a Static Var Generator M. Li, J. N for a cascaded multilevel inverter to be used for static var compensation. Index Terms-- Multilevel Inverter, Static Var Generator (SVG), Cascade inverter. I. INTRODUCTION Multilevel inverters have gained much

Tolbert, Leon M.

219

HARMONIC CASCADE FEL DESIGNS FOR LUX, A FACILTY FOR ULTRAFAST X-RAY SCIENCE  

E-Print Network [OSTI]

-electron laser (FEL) beamlines which use the har- monic cascade approach to produce coherent XUV & soft X-ray for an integrated system of ultrafast x-ray techniques and lasers, using laser-seeded harmonic cascade FEL's, rfHARMONIC CASCADE FEL DESIGNS FOR LUX, A FACILTY FOR ULTRAFAST X-RAY SCIENCE J. Corlett, W. Fawley

Wurtele, Jonathan

220

San Andreas Geothermal Region | Open Energy Information  

Open Energy Info (EERE)

San Andreas Geothermal Region San Andreas Geothermal Region Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home San Andreas Geothermal Region Details Areas (4) Power Plants (0) Projects (0) Techniques (1) Map: {{{Name}}} The topographic texture of western California is controlled by the San Andreas fault system, the tectonic expression of the Pacific Plate sliding northwestward along the western margin of the North American Plate. Hundreds of miles long and in places up to a mile wide, the San Andreas Fault Zone has been active since its origin in the Tertiary. About 10 percent of the present plate motion is compressional, shortening and wrinkling the crust to create the parallel coastal northwest-southeast mountain ranges. USGS Physiographic Regions[1] References ↑ "USGS Physiographic Regions"

Note: This page contains sample records for the topic "region cascades tectonic" 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

Activation of the cyclic AMP cascade as an ocoggenic mechanism: The thyroid example  

Science Journals Connector (OSTI)

Three cascades activate thyroid cell proliferation: the EGF-protein tyrosine kinase pathway, the phorbol ester-protein kinase C pathway and the thyrotropin-cyclic AMP pathway. While the first cascades converge early, they remain distinct from the cyclic AMP cascade until very late in G1. The cyclic AMP cascade us characterized by an early and transient expression of c-myc, which may explain why it induces proliferation and differentiation expression. Constitutive activation of this cascade causes growth and hyperfunction, ie, hyperfunctioning adenomas. The various possible defects that could lead to such a constitutive activation are discussed.

C. Maenhaut; P.P. Roger; S. Reuse; J.E. Dumont

1991-01-01T23:59:59.000Z

222

Cascade and breakdown in scale-free networks with community structure  

Science Journals Connector (OSTI)

The cascade failures in scale-free networks with community structure are studied and cascade propagation of such networks with different modularity parameters is simulated. It is found that the network with small modularity is much easier to trigger cascade failures than that of the larger one. Furthermore, different removal strategies have some what large effects on the cascade failures aftereffect. The simulations also show that larger modularity and reserve capacity coefficient will delay the breakdown caused by a cascade of network. This is particularly important for such real networks with community as traffic networks, distribution networks, and electrical power grids.

Jian-jun Wu; Zi-you Gao; Hui-jun Sun

2006-12-19T23:59:59.000Z

223

Southern Basin and Range Geothermal Region | Open Energy Information  

Open Energy Info (EERE)

Basin and Range Geothermal Region Basin and Range Geothermal Region Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Southern Basin and Range Geothermal Region Details Areas (0) Power Plants (0) Projects (0) Techniques (0) Map: {{{Name}}} North-south-striking and west-dipping Basin and Range province normal faults form the western edge of the Sierra Madre Occidental plateau in northeastern Sonora. These faults and associated half-grabens extend over a distance of more than 300 km between the San Bernardino basin in the north and the Sahuaripa basin in the south. Active Tectonics of Northeastern Sonora, Mexico (Southern Basin and Range Province) and the 3 May 1887 Mw 7.4 Earthquake [1] References ↑ "Active Tectonics of Northeastern Sonora, Mexico (Southern Basin and Range Province) and the 3 May 1887 Mw 7.4 Earthquake"

224

Tectonic implications of tomographic images of subducted lithosphere beneath Northwestern South America  

SciTech Connect (OSTI)

Tomographic images and deep seismicity of the mantle beneath northwestern South America support the existence of extensive and continuous subducted slabs which may be important controls on the neotectonic deformation of the overriding South America plate. Using tomographic data, we have estimated lateral continuity, regional dip, downdip length and approximate convergence direction of two, largely aseismic slabs. Tomographic data suggests that the Cauca slab, previously defined using earthquakes beneath southern Colombia, extends 300 km into the mantle beneath northern Colombia, has an average dip of 50[degrees], and is the downdip extension of Eocene to Miocene Panama island arc and Oligocene-Miocene oceanic crust of the Nazca plate. The Maracaibo slab of northern Colombia and western Venezuela extends up to 450 km into the mantle at an average angle of 16[degrees] and is the downdip extension of Late Cretaceous oceanic plateau crust of the Caribbean Sea. The boundary between the two slabs is less than 50 km in width. The Maracaibo and northern Cauca slabs are generally aseismic and not associated with an overlying volcanic arc. Instead, both slabs are overlain by broad zones of diffuse active faulting and topography in the northern Andes. The shallow dip, angle of oblique subduction and thickness of the Maracaibo slab may produce crustal deformation including northward tectonic escape of the Maracaibo block, a triangular wedge of continental crust in the overriding South America plate.

Van Der Hilst, R. (Leeds Univ. (United Kingdom)); Mann, P. (Univ. of Texas, Austin (United States))

1993-02-01T23:59:59.000Z

225

Nanobulges on surface of silicon film and SiYb quantum cascade laser  

Science Journals Connector (OSTI)

Abstract Nanosilicon provides pumping levels and the localized states produced from SiYb bond on bulge surface of silicon film generate stimulated emission, in which a four-level system is built for chip-laser. The SiYb nanobulges on Si film cause a remarkable increase of the surface area and make a buffering layer for mismatch between Si and Yb lattices. Dynamics of photoluminescence and electroluminescence on nanosilicon coated by Yb is investigated. Stimulated peaks near 700nm are observed on silicon quantum dots coated by Yb. Enhanced EL peaks in the wavelength region from 1300nm to 1650nm are measured on the Si film coated by Yb. SiYb quantum cascade laser is designed, in which emission wavelength could be manipulated into the window of optical communication by SiYb bonding on bulge surface of Si film.

Wei-Qi Huang; Shirong Liu; Zhong-Mei Huang; Xin-Jian Miao; Chao-Jian Qin; Quan Lv

2014-01-01T23:59:59.000Z

226

Chronostratigraphy and tectonic deformation of the North EcuadorianSouth Colombian offshore Manglares forearc basin  

E-Print Network [OSTI]

Chronostratigraphy and tectonic deformation of the North Ecuadorian­South Colombian offshore.5°, where it is fronted by the Colombian accretionary wedge (Mountney and Westbrook, 1997). This study

Vallée, Martin

227

Evidence for Large-Scale Laramide Tectonic Inversion and a Mid...  

Open Energy Info (EERE)

Scale Laramide Tectonic Inversion and a Mid-Tertiary Caldera Ring Fracture Zone at the Lightning Dock Geothermal System, New Mexico Jump to: navigation, search OpenEI Reference...

228

Mesozoic tectonic inversion in the Neuquen Basin of west-central Argentina  

E-Print Network [OSTI]

Mesozoic tectonic inversion in the Neuquen Basin of west-central Argentina produced two main fault systems: (1) deep faults that affected basement and syn-rift strata where preexisting faults were selectively reactivated during inversion based...

Grimaldi Castro, Gabriel Orlando

2007-04-25T23:59:59.000Z

229

Sedimentary record and tectonic implications of Mesozoic rifting in southeast Mongolia  

Science Journals Connector (OSTI)

...Mongolia, China, and tectonic...between north China and Siberia...Journal of Petroleum Geology...All-Union Export and Import Corporation...between north China and Siberia...Journal of Petroleum Geology...Ex-port and Import Corporation...

230

Cascade-Chipita Park, Colorado: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Cascade-Chipita Park, Colorado: Energy Resources Cascade-Chipita Park, Colorado: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 38.9498727°, -105.0031457° 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":38.9498727,"lon":-105.0031457,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

231

Delay time calculation for dual-wavelength quantum cascade lasers  

SciTech Connect (OSTI)

In this paper, we calculate the turn-on delay (t{sub th}) and buildup (?t) times of a midinfrared quantum cascade laser operating simultaneously on two laser lines having a common upper level. The approach is based on the four-level rate equations model describing the variation of the electron number in the states and the photon number present within the cavity. We obtain simple analytical formulae for the turn-on delay and buildup times that determine the delay times and numerically apply our results to both the single and bimode states of a quantum cascade laser, in addition the effects of current injection on t{sub th} and ?t are explored.

Hamadou, A., E-mail: abd-hamado@yahoo.fr [Dpartement des Sciences et Techniques, Facult des Sciences et de la Technologie, Universit de Bordj Bou Arreridj 34000 (Algeria); Laboratoire dtude des surfaces et interfaces des matriaux solides (LESIMS), Stif 19000 (Algeria); Lamari, S. [Laboratoire dtude des surfaces et interfaces des matriaux solides (LESIMS), Stif 19000 (Algeria); Dpartement de Physique, Facult des Sciences, Universit Stif 1, 19000 (Algeria); Thobel, J.-L. [Institut d'Electronique, de Microlectronique et de Nanotechnologie (IEMN), UMR 8520, Universit Lille1, Avenue Poincar, BP 60069, 59652 Villeneuve d'Ascq Cdex (France)

2013-11-28T23:59:59.000Z

232

The critical tension in the 6D Cascading DGP model  

E-Print Network [OSTI]

We investigate the presence of ghosts in the Cascading DGP model. We start by discussing the problem of the cosmological late time acceleration, and we introduce the modified gravity approach. We then focus on brane induced gravity models and in particular on the Cascading DGP model. We consider a specific realization of the latter model, and we study first order perturbations around pure tension solutions. In the scalar sector of a 4D scalar-vector-tensor decomposition, the dynamics on the 4D brane can be described by a master equation where a critical tension emerges in a suitable 4D limit. We give a geometrical interpretation of this critical tension, and explain its relevance for the presence of ghosts in the theory. We comment on the difference between our result and the one present in the literature, and stress its importance regarding the phenomenological viability of the model. We finally provide a numerical check which confirms the validity of our analysis.

Sbisa', Fulvio

2014-01-01T23:59:59.000Z

233

Cascade Apartments - Deep Energy Multifamily Retrofit , Kent, Washington (Fact Sheet)  

SciTech Connect (OSTI)

In December of 2009-10, King County Housing Authority (KCHA) implemented energy retrofit improvements in the Cascade multifamily community, located in Kent, Washington (marine climate.)This research effort involved significant coordination from stakeholders KCHA, WA State Department of Commerce, utility Puget Sound Energy, and Cascade tenants. This report focuses on the following three primary BA research questions : 1. What are the modeled energy savings using DOE low income weatherization approved TREAT software? 2. How did the modeled energy savings compare with measured energy savings from aggregate utility billing analysis? 3. What is the Savings to Investment Ratio (SIR) of the retrofit package after considering utility window incentives and KCHA capitol improvement funding.

Not Available

2014-02-01T23:59:59.000Z

234

Enhanced Kerr electro-optic nonlinearity through cascaded Pockels effects  

E-Print Network [OSTI]

We demonstrated a large enhancement of Kerr electro-optic nonlinearity through cascaded Pockels effects in a domain inversion ferroelectric crystal. We designed a structure that can implement the cascaded Pockels effects and second-harmonic generation simultaneously. The energy coupling between the fundamental lights of different polarizations led to a large nonlinear phase shift, and thus an effective electro-optic nonlinear refractive index. The effective nonlinearity can be either positive or negative, causing the second-harmonic spectra to move towards the coupling center, which in turn, offered us a way to measure the effective electro-optic nonlinear refractive index. The corresponding enhanced Kerr electro-optic nonlinearity is more than three orders of magnitude higher than the intrinsic value. These results open a door to manipulate the nonlinear phase by applying external electric field instead of light intensity in noncentrosymmetric crystals.

Li, Guang-Zhen; Jiang, Hao-Wei; Chen, Xian-Feng

2015-01-01T23:59:59.000Z

235

Finite-time cascaded tracking control approach for mobile robots  

Science Journals Connector (OSTI)

Abstract This paper develops a new control approach for trajectory tracking of mobile robots. For the purpose of tracking trajectory, the error dynamics of a mobile robot are divided into a first-order subsystem and a second-order subsystem by using a cascaded control design. Firstly, a global finite-time control law of the angular velocity is designed for the first-order system in order to stabilize the angle error of mobile robots. Subsequently, a finite-time sliding mode control law of forward velocity is synthesized, which guarantees the global stability of the second-order subsystem. Furthermore, the global uniform stability of the whole closed-loop system is analyzed by employing cascaded control theory, and some sufficient conditions are derived. Finally, the proposed control algorithm is applied to mobile robots, where simulation results demonstrate good convergence and performance.

Yangming Zhang; Guorong Liu; Biao Luo

2014-01-01T23:59:59.000Z

236

Microsoft Word - Cascade Networks Allston Substation LURR CX.doc  

Broader source: Energy.gov (indexed) [DOE]

15, 2011 15, 2011 REPLY TO ATTN OF: KEC-4 SUBJECT: Environmental Clearence Memorandum Harold Grappe - TELP-TPP-3 Proposed Action: Cascade Networks, Inc. LURR at Allston Substation Budget Information: Work Order # 00275035 Task 03 Categorical Exclusions Applied (from Subpart D, 10 C.F.R. Part 1021: B1.7 "Acquisition, installation, operation, and removal of communication systems, data processing equipment, and similar electronic equipment." B4.7 "Adding fiber optic cable to transmission structures..." Location: Section 10, Township 7 North, Range 3 West of the Delena Quadrangle located in Columbia County, Oregon Proposed by: Bonneville Power Administration (BPA) Description of the Proposed Action: BPA proposes to grant Cascade Networks, Inc. permission to

237

GaInAs/AlInAs quantum cascade laser design based on optimized second harmonic generation  

Science Journals Connector (OSTI)

In this work, we present an innovative procedure for the design and optimization of GaInAs/AlInAs quantum cascade laser (QCL) structures based on the use of the genetic algorithm. The purpose of the algorithm is to determine the set of design parameters that would enable the maximization of the second order nonlinear susceptibility, thus facilitating significant optical nonlinearities to take place. In our optimization model, we start from the existing design in which the active region consists of two coupled InGaAs quantum wells separated by an AlInAs barrier, and the active region levels form double resonant nonlinear cascades. Upon obtaining the optimized structure and evaluating its energies and wave functions, the output characteristics are calculated by applying the full self-consistent rate equation modeling of the electron transport in a periodic QCL structure. The results of the calculations predict a noticeable improvement of targeted properties of the optimized design, while at the same time the original design calculations show excellent agreement with experimental results. The described procedure is applicable to various active region designs and can be used for other wavelength ranges.

A Gaji?; J Radovanovi?; V Milanovi?; D Indjin; Z Ikoni?

2014-01-01T23:59:59.000Z

238

Gain spectra and temperature characteristics of quantum cascade lasers  

Science Journals Connector (OSTI)

We have developed a theory describing the operation of lasers based on intersubband transitions in a quantum well. The theory combines a first-principles description of the intersubband lineshape and the optical gain with kinetic models for carrier heating. ... Keywords: carrier heating, gain spectra, intersubband lineshape, intersubband transitions, kinetic models, laser theory, optical gain, quantum cascade lasers, quantum well, quantum well lasers, room-temperature high-power operation, temperature characteristics

V. Gorfinkel; S. Luryi; B. Gelmont

1995-11-01T23:59:59.000Z

239

Deeply etched waveguide structures for quantum cascade lasers  

Science Journals Connector (OSTI)

A high density plasma process was developed for reactive ion etching (RIE) of GaAs/AlGaAs based devices which can be applied for the processing of advanced resonator designs. We present diffractive resonators fabricated using inductively coupled plasma ... Keywords: 42.55.Px, 42.55.Xi, 78.67.De, 81.65.Cf, Deep etching, Distributed feedback, Photonic crystals, Quantum cascade lasers

S. Schartner; S. Golka; C. Pflgl; W. Schrenk; G. Strasser

2006-04-01T23:59:59.000Z

240

Unexpected Copper-Catalyzed Cascade Synthesis of Quinazoline Derivatives  

Science Journals Connector (OSTI)

Unexpected Copper-Catalyzed Cascade Synthesis of Quinazoline Derivatives ... Nitrogen-containing heterocycles are present in a wide variety of bioactive natural products and biological molecules that may be good drug candidates. ... To our surprise, the trace of unexpected 2-phenylquinazoline (3a) was observed by gas chromatography/mass spectrometry (electron ionization) [GC/MS (EI)] analysis during the process of performing the above condensation reaction in the presence of ceric ammonium nitrate (CAN). ...

Zhongyan Chen; Jiuxi Chen; Miaochang Liu; Jinchang Ding; Wenxia Gao; Xiaobo Huang; Huayue Wu

2013-10-17T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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.


241

A Thermal Cascade Route to Pyrroloisoindolone and Pyrroloimidazolones  

Science Journals Connector (OSTI)

A Thermal Cascade Route to Pyrroloisoindolone and Pyrroloimidazolones ... However, we have shown that pyrrolizin-3-ones 1 and related ring systems can be conveniently made in the gas phase by flash vacuum pyrolysis (FVP) of Meldrum's acid derivatives6,7 (the Meldrum's route) and by FVP of pyrrol-2-ylacrylate derivatives (the C-acrylate route). ... This always overrides the natural direction of migration in the unsubstituted ring system. ...

Hamish McNab; Richard G. Tyas

2007-10-19T23:59:59.000Z

242

THz quantum cascade lasers for standoff molecule detection.  

SciTech Connect (OSTI)

Remote optical detection of molecules, agents, and energetic materials has many applications to national security interests. Currently there is significant interest in determining under what circumstances THz frequency coverage will aid in a complete sensing package. Sources of coherent THz frequency (i.e. 0.1 to 10 THz) electromagnetic radiation with requisite power levels, frequency agility, compactness and reliability represent the single greatest obstacle in establishing a THz technology base, but recent advances in semiconductor-based quantum cascade lasers (QCLs) offer huge improvements towards the ultimate THz source goals. This project advanced the development of narrow-linewidth THz quantum cascade lasers. We developed theoretical tools to guide the improvement of standard THz quantum cascade lasers, the investigation of nonlinear optics employing infrared QCLs, and the exploration of quantum coherence to improve QCL performance. The latter was aimed especially towards achieving high temperature operation. In addition we developed a computer algorithm capable of shifting the frequencies of an existing THz QCL to a different frequency and invented a new type of laser that may enable room temperature THz generation in a electrically driven solid-state source.

Chow, Weng Wah; Wanke, Michael Clement; Lerttamrab, Maytee; Waldmueller, Ines

2007-10-01T23:59:59.000Z

243

Operation of terahertz quantum-cascade lasers at 164 K in pulsed mode and at 117 K in continuous-wave mode.  

SciTech Connect (OSTI)

We report the demonstration of a terahertz quantum-cascade laser that operates up to 164 K in pulsed mode and 117 K in continuous-wave mode at approximately 3.0 THz. The active region was based on a resonant-phonon depopulation scheme and a metal-metal waveguide was used for modal confinement. Copper to copper thermocompression wafer bonding was used to fabricate the waveguide, which displayed improved thermal properties compared to a previous indium-gold bonding method.

Kumar, Sushil (Massachusetts Institute of Technology, Cambridge, MA); Williams, Benjamin S. (Massachusetts Institute of Technology, Cambridge, MA); Hu, Qing (Massachusetts Institute of Technology, Cambridge, MA); Reno, John Louis

2005-04-01T23:59:59.000Z

244

San Andreas Geothermal Region | Open Energy Information  

Open Energy Info (EERE)

San Andreas Geothermal Region San Andreas Geothermal Region (Redirected from San Andreas) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home San Andreas Geothermal Region Details Areas (4) Power Plants (0) Projects (0) Techniques (1) Map: {{{Name}}} The topographic texture of western California is controlled by the San Andreas fault system, the tectonic expression of the Pacific Plate sliding northwestward along the western margin of the North American Plate. Hundreds of miles long and in places up to a mile wide, the San Andreas Fault Zone has been active since its origin in the Tertiary. About 10 percent of the present plate motion is compressional, shortening and wrinkling the crust to create the parallel coastal northwest-southeast mountain ranges. USGS Physiographic Regions[1]

245

Comparative performance evaluation of cascaded air-source hydronic heat pumps  

Science Journals Connector (OSTI)

Abstract The results are reported of an investigation of the effects of cascading air-source heat pumps on performance for hydronic residential systems. Three heat pump systems are modeled as single-stage, single-refrigerant cascaded, and two-refrigerant cascaded. Energy and exergy analyses are performed, and a comparative performance analysis is carried out, considering energy efficiency, refrigerant mass flow rates, evaporator pressure, exergy efficiency, and several other criteria. Three sets of source and supply temperatures, representing different climates and different water sink systems (low, medium and high temperature), are used to provide more comprehensive behavior assessments of the systems. Additionally, the optimum intermediate pressure of the cascaded systems for all working temperature pairs is found for the highest energetic COP and exergetic COP. Compared to a single stage heat pump, cascading improves the overall energy efficiency of the system for low-ambient temperatures, but not for high-ambient temperatures. Although this improvement is minor, the exergetic COP is increased by 67% for the single refrigerant cascaded system and 70% for a two-refrigerant cascaded system, at low ambient temperatures. Using refrigerant R404A in the low-pressure cycle marginally improves the energetic COP of the cascaded heat pump, but increases the evaporator working pressure, making it possible to use smaller compressors. However, the overall refrigerant mass flow rates increase with cascading. The two cascaded systems have higher exergy destructions (by almost four times) compared to the single stage system, mainly due to having more components, including an intermediate heat exchanger. Also, cascading shifts the major exergy destruction centers from the compressors and expansion valves to the evaporators. A comparison of cascaded and single-stage heat pumps shows that the exergy analysis results exhibit a different trend than energy analysis results with source and supply temperatures, highlighting the advantages of exergy methods in determining if cascading is appropriate for a given application.

R. Soltani; I. Dincer; M.A. Rosen

2015-01-01T23:59:59.000Z

246

Eustatic control of gravity tectonics: Concept, mechanism and limits  

SciTech Connect (OSTI)

Gravity tectonics over a ductile decollement characterizes deformation of the Albian to Recent section in the West African margin, from Gabon to Angola. Largely studied during the past 20 years as a prolific petroleum play, it is now well known that three mains factors will control gravity driven deformation: the ductile layer, the slope as a response to the crustal activity and the overlying sedimentary loading. For the West African passive margin, the slope effect at the first glance can be considered as constant and gravity driven deformation as a result of salt layer distribution (in time and space) and sedimentary loading. If previous papers have already shown that the type and distribution of the deposits control the development of the classical structural domains : updip extensional to downdip contractional, this study will focused on the factor which control the sedimentary loading. Based on several natural examples combining seismic stratigraphy, sequential stratigraphy and structural studies and also analogical modelling, it is demonstrated that: (1) as sediment distribution and then sedimentary loading is controlled by relative sea level changes, thus sea level changes can be directly related to gravity driven deformation : large sea level fall will provide an important increase of clastics supply which will enhanced gravity gliding. On the contrary, relative sea level high will stop the deformation because of the decreasing amount of detritics and their homogeneous distribution. (2) the salt downdip withdrawal during extension will enhance the eustatic effect. (3) episodic crustal activity, materialized by westward tilting of the margin will interfere on this mechanism.

Raillard, S.; Allix, P.; Guerin, G.; Lecanu, H. [Elf Aquitaine Production, Pau (France)] [and others

1996-12-31T23:59:59.000Z

247

Eustatic control of gravity tectonics: Concept, mechanism and limits  

SciTech Connect (OSTI)

Gravity tectonics over a ductile decollement characterizes deformation of the Albian to Recent section in the West African margin, from Gabon to Angola. Largely studied during the past 20 years as a prolific petroleum play, it is now well known that three mains factors will control gravity driven deformation: the ductile layer, the slope as a response to the crustal activity and the overlying sedimentary loading. For the West African passive margin, the slope effect at the first glance can be considered as constant and gravity driven deformation as a result of salt layer distribution (in time and space) and sedimentary loading. If previous papers have already shown that the type and distribution of the deposits control the development of the classical structural domains : updip extensional to downdip contractional, this study will focused on the factor which control the sedimentary loading. Based on several natural examples combining seismic stratigraphy, sequential stratigraphy and structural studies and also analogical modelling, it is demonstrated that: (1) as sediment distribution and then sedimentary loading is controlled by relative sea level changes, thus sea level changes can be directly related to gravity driven deformation : large sea level fall will provide an important increase of clastics supply which will enhanced gravity gliding. On the contrary, relative sea level high will stop the deformation because of the decreasing amount of detritics and their homogeneous distribution. (2) the salt downdip withdrawal during extension will enhance the eustatic effect. (3) episodic crustal activity, materialized by westward tilting of the margin will interfere on this mechanism.

Raillard, S.; Allix, P.; Guerin, G.; Lecanu, H. (Elf Aquitaine Production, Pau (France)) (and others)

1996-01-01T23:59:59.000Z

248

Overview of the structural geology and tectonics of the Central Basin Platform, Delaware Basin, and Midland Basin, West Texas and New Mexico  

SciTech Connect (OSTI)

The structural geology and tectonics of the Permian Basin were investigated using an integrated approach incorporating satellite imagery, aeromagnetics, gravity, seismic, regional subsurface mapping and published literature. The two primary emphases were on: (1) delineating the temporal and spatial evolution of the regional stress state; and (2) calculating the amount of regional shortening or contraction. Secondary objectives included delineation of basement and shallower fault zones, identification of structural style, characterization of fractured zones, analysis of surficial linear features on satellite imagery and their correlation to deeper structures. Gandu Unit, also known as Andector Field at the Ellenburger level and Goldsmith Field at Permian and younger reservoir horizons, is the primary area of interest and lies in the northern part of Ector county. The field trends northwest across the county line into Andrews County. The field(s) are located along an Ellenburger thrust anticline trap on the eastern margin of the Central Basin Platform.

Hoak, T. [Kestrel Geoscience, Littleton, CO (United States); Sundberg, K. [Phillips Petroleum Co., Bartlesville, OK (United States); Ortoleva, P. [Indiana Univ., Bloomington, IN (United States)

1998-12-31T23:59:59.000Z

249

Applications of Quaternary stratigraphic, soil-geomorphic, and quantitative geomorphic analyses to the evaluation of tectonic activity and landscape evolution in the Upper Coastal Plain, South Carolina  

SciTech Connect (OSTI)

Geomorphic analyses combined with mapping of fluvial terraces and upland geomorphic surfaces provide new approaches and data for evaluating the Quaternary activity of post-Cretaceous faults that are recognized in subsurface data at the Savannah River Site in the Upper Coastal Plain of southwestern South Carolina. Analyses of longitudinal stream and terrace profiles, regional slope maps, and drainage basin morphometry indicate long-term uplift and southeast tilt of the site region. Preliminary results of drainage basin characterization suggests an apparent rejuvenation of drainages along the trace of the Pen Branch fault (a Tertiary reactivated reverse fault that initiated as a basin-margin normal fault along the northern boundary of the Triassic Dunbarton Basin). This apparent rejuvenation of drainages may be the result of nontectonic geomorphic processes or local tectonic uplift and tilting within a framework of regional uplift.

Hanson, K.L.; Bullard, T.F.; de Wit, M.W. [Geomatrix Consultants, Inc., San Francisco, CA (United States); Stieve, A.L. [Westinghouse Savannah River Co., Aiken, SC (United States)

1993-07-01T23:59:59.000Z

250

Structure, tectonics and stress field of the Coso Range, Inyo...  

Open Energy Info (EERE)

been produced by the regional stress field rather than to have been of volcanogenic origin. Focal mechanisms of small-magnitude earthquakes support the stress directions...

251

Modernization of the guide bearings of turbines of the cascade of Chirchik hydroelectric stations  

Science Journals Connector (OSTI)

The favorable experience of reconstruction and subsequent operation of the guide bearings of turbines of the cascade of Chirchik hydrostations confirms the possibility of modernizing bearings under conditions ...

V. V. Balagurov; Yu. P. Maizel'; M. A. Tsvetkova

1981-08-01T23:59:59.000Z

252

Faraday rotation spectroscopy of nitrogen dioxide based on a widely tunable external cavity quantum cascade laser  

E-Print Network [OSTI]

Faraday rotation spectroscopy of nitrogen dioxide based on a widely tunable external cavity quantum: Faraday Rotation Spectroscopy, external-cavity quantum cascade laser, nitrogen dioxide, trace

253

External Cavity Quantum Cascade Lasers: Recent Advances, Applications, and Comparisons with Alternative Sources in the MIR  

Science Journals Connector (OSTI)

The performance of external cavity quantum/interband cascade lasers (ECqcL/ECicL) in molecular detection and imaging applications will be discussed. Alternative MIR laser technologies...

Day, Timothy

254

Limiting Factors for High Temperature Operation of THz Quantum Cascade Lasers  

Science Journals Connector (OSTI)

We theoretically investigate the temperature dependence of the carrier transport in GaAs-based THz quantum cascade lasers and identify the factors restricting high-temperature...

Jirauschek, Christian; Lugli, Paolo

255

Quantum cascade laser spectrometer for trace-gas detection of exhaled Carbonyl Sulfide  

Science Journals Connector (OSTI)

Simultaneous concentration measurements of exhaled carbonyl sulfide and carbon dioxide were demonstrated using a pulsed quantum cascade laser based gas sensor. This sensor has...

Wysocki, Gerard; So, Stephen; McCurdy, Matt; Roller, Chad; Weidmann, Damien; Kosterev, Anatoliy a; Frantz, J Patrick; Curl, Robert F; Tittel, Frank K

256

THz Quantum Cascade Lasers Grown by Low-Pressure Metalorganic Vapor Phase Epitaxy  

Science Journals Connector (OSTI)

A terahertz quantum cascade laser (QCL) has been successfully grown by low-pressure MOVPE. Very high quality semiconductor interfaces are demonstrated as well as very promising lasing...

Sirigu, Lorenzo; Rudra, Alok; Amanti, Maria I; Scalari, Giacomo; Fischer, Milan; Giovannini, Marcella; Faist, Jerome; Kapon, Eli

257

E-Print Network 3.0 - acid cascade enzymes Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Biology and Medicine 38 Computational Modelling of Kinase Signalling Cascades David Gilbert, Monika Heiner, Rainer Breitling, and Richard Orton Summary: of Kinase Signalling...

258

Atomistic Modeling of Displacement Cascades in La2Zr2O7 Pyrochlore...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

point defects, such as cations antisites configurations, various interstitials, and vacancies. There is no evidence for direct amorphization within the cascades. The results are...

259

Growth faults and salt tectonics in Houston diapir province: relative timing and exploration significance  

SciTech Connect (OSTI)

Oil and gas accumulation in Gulf Coast Tertiary strata is contolled mainly by regional growth faults and by salt-related structures. Salt forms the most prominent set of structures in the Houston diapir province of southeast Texas. Recent work in three study areas shows that the Tertiary growth-fault trends, so well displayed along strike to the south-west, continue through this salt basin as well, but they have been deformed by later salt movement. In the Katy area, seismic data disclose early (pre-Wilcox) salt pillows downdip of the Cretaceous reef trend. Salt stocks were injected upward from the pillows during Clayborne deposition, and were flanked by deep withdrawal basins and turtle structures. In Brazoria County, a major lower Frio growth-fault trend affecting the Houston delta system, was deformed by later salt domes, by a salt-withdrawal basin, and by a possible turtle structure at Chocolate Bayou. A productive geopressured aquifer exists in the salt-withdrawal basin bounded by the previously formed growth faults. In Jefferson County, in contrast, salt-tectonic activity and growth faulting appear to have been coeval. Early salt-cored ridges continued to rise throughout Frio deposition; growth faults occur both updip and downdip. Hydrocarbons accumulated over the salt domes in growth-fault anticlines and in stratigraphic traps. Recognition that shelf-margin growth faulting preceded the development of the present pattern of domes and basins has important implications for hydrocarbon exploration. Growth faults may be migration paths for hydrocarbons; furthermore, early formed traps, distorted by salt movement, may still be found to contain hydrocarbons.

Ewing, T.E.

1983-09-01T23:59:59.000Z

260

Cascaded Cerenkov third-harmonic generation in random quadratic media  

SciTech Connect (OSTI)

We investigate experimentally and theoretically the conical emission of Cerenkov-type third-harmonic generation in strontium barium niobate of random 2D-{chi}{sup (2)} distribution. The azimuthal intensity distribution is explained by the polarization properties of the fundamental and Cerenkov second-harmonic waves, depending on the cascaded origin of the generation process. Moreover, we show the role of the individual domain shape in an additional modulation on the conical emission, controlled by the electrical switching of the spontaneous polarization of the ferroelectric medium.

Ayoub, Mousa; Roedig, Philip; Imbrock, Joerg; Denz, Cornelia [Institute of Applied Physics and Center for Nonlinear Science (CeNoS), Westfaelische Wilhelms-Universitaet Muenster, Corrensstrasse 2, 48149 Muenster (Germany)

2011-12-12T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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

Entanglement amplification in a nondegenerate three-level cascade laser  

SciTech Connect (OSTI)

We analyze a nondegenerate three-level cascade laser coupled to a two-mode vacuum reservoir employing the stochastic differential equations associated with the normal ordering. We study the squeezing properties and entanglement amplification of the cavity radiation. We also calculate the correlation of the photon numbers and the fluctuations of the intensity difference. It turns out that the generated light exhibits a two-mode squeezing and entanglement when initially there are more atoms in the lower level. Moreover, a strong correlation between photon numbers along with a significant fluctuation in the intensity difference is found.

Tesfa, Sintayehu [Physics Department, Addis Ababa University, P. O. Box 1176, Addis Ababa (Ethiopia)

2006-10-15T23:59:59.000Z

262

Synthesis of a Leucomitosane via a Diastereoselective Radical Cascade  

Science Journals Connector (OSTI)

GC analyses were carried out on a GC instrument fitted with an Optima delta-3-0.25 ?m capillary column (20 m, 0.25 mm); gas carrier, He 1.4 mL/min; injector, 220 C split mode; detector, FID 280 C, H2 35 mL/min, air 350 mL/min. ... cascade of a 1,3,4-oxadiazole in which the pentacyclic skeleton and all the stereochem. of the natural products are assembled in a reaction that forms three rings, four C-C bonds, and five stereogenic centers including three contiguous quaternary centers, and introduces the correct oxidn. ...

Franois Brucelle; Philippe Renaud

2013-05-30T23:59:59.000Z

263

CP-violation in SUSY cascades at the LHC  

E-Print Network [OSTI]

We study the potential to observe CP-violating effects in SUSY cascade decay chains at the LHC. Asymmetries composed by triple products of momenta of the final state particles are sensitive to CP-violating effects. Due to large boosts that dilute the asymmetries, these can be difficult to observe. Extending the methods of momentum reconstruction we show that the original size of these asymmetries may be measurable. A study is done at the hadronic level with backgrounds to estimate the expected sensitivity at the LHC.

Jamie Tattersall; Gudrid Moortgat-Pick; Krzysztof Rolbiecki

2010-09-01T23:59:59.000Z

264

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

265

Criticality safety concerns of uranium deposits in cascade equipment  

SciTech Connect (OSTI)

The Paducah and Portsmouth Gaseous Diffusion Plants enrich uranium in the {sup 235}U isotope by diffusing gaseous uranium hexafluoride (UF{sub 6}) through a porous barrier. The UF{sub 6} gaseous diffusion cascade utilized several thousand {open_quotes}stages{close_quotes} of barrier to produce highly enriched uranium (HEU). Historically, Portsmouth has enriched the Paducah Gaseous Diffusion Plant`s product (typically 1.8 wt% {sup 235}U) as well as natural enrichment feed stock up to 97 wt%. Due to the chemical reactivity of UF{sub 6}, particularly with water, the formation of solid uranium deposits occur at a gaseous diffusion plant. Much of the equipment operates below atmospheric pressure, and deposits are formed when atmospheric air enters the cascade. Deposits may also be formed from UF{sub 6} reactions with oil, UF{sub 6} reactions with the metallic surfaces of equipment, and desublimation of UF{sub 6}. The major deposits form as a result of moist air in leakage due to failure of compressor casing flanges, blow-off plates, seals, expansion joint convolutions, and instrument lines. This report describes criticality concerns and deposit disposition.

Plaster, M.J. [Lockheed Martin Utility Services, Inc., Piketon, OH (United States)

1996-12-31T23:59:59.000Z

266

Modified gravity, the Cascading DGP model and its critical tension  

E-Print Network [OSTI]

We investigate the presence of instabilities in the Cascading DGP model. We start by discussing the problem of the cosmological late time acceleration, and we introduce the modified gravity approach. We then focus on brane induced gravity models and in particular on the Cascading DGP model. We consider configurations of the latter model where the source term is given simply by vacuum energy (pure tension), and we study perturbations at first order around these configurations. We perform a four-dimensional scalar-vector-tensor decomposition of the perturbations, and show that, regarding the scalar sector, the dynamics in a suitable limit can be described by a master equation. This master equation contains an energy scale (critical tension) which is related in a non-trivial way to the parameters of the model. We give a geometrical interpretation of why this scale emerges, and explain its relevance for the presence of ghost instabilities in the theory. We comment on the difference between our result and the one present in the literature, and stress its importance regarding the phenomenological viability of the model. We finally provide a numerical check which confirms the validity of our analysis.

Fulvio Sbisa'

2014-12-17T23:59:59.000Z

267

Superfluid Turbulence from Quantum Kelvin Wave to Classical Kolmogorov Cascades  

SciTech Connect (OSTI)

The main topological feature of a superfluid is a quantum vortex with an identifiable inner and outer radius. A novel unitary quantum lattice gas algorithm is used to simulate quantum turbulence of a Bose-Einstein condensate superfluid described by the Gross-Pitaevskii equation on grids up to 5760{sup 3}. For the first time, an accurate power-law scaling for the quantum Kelvin wave cascade is determined: k{sup -3}. The incompressible kinetic energy spectrum exhibits very distinct power-law spectra in 3 ranges of k space: a classical Kolmogorov k{sup -(5/3)} spectrum at scales greater than the outer radius of individual quantum vortex cores and a quantum Kelvin wave cascade spectrum k{sup -3} on scales smaller than the inner radius of the quantum vortex core. The k{sup -3} quantum Kelvin wave spectrum due to phonon radiation is robust, while the k{sup -(5/3)} classical Kolmogorov spectrum becomes robust on large grids.

Yepez, Jeffrey [Air Force Research Laboratory, Hanscom Air Force Base, Massachusetts 01731 (United States); Vahala, George [Department of Physics, William and Mary, Williamsburg, Virginia 23185 (United States); Vahala, Linda [Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, Virginia 23529 (United States); Soe, Min [Department of Mathematics and Physical Sciences, Rogers State University, Claremore, Oklahoma 74017 (United States)

2009-08-21T23:59:59.000Z

268

Direct and Inverse Cascades in the Wind-Driven Sea  

E-Print Network [OSTI]

We offer a new form for the S(nl) term in the Hasselmann kinetic equation for squared wave amplitudes of wind-driven gravity wave. This form of S(nl) makes possible to rewrite in differential form the conservation laws for energy, momentum, and wave action, and introduce their fluxes by a natural way. We show that the stationary kinetic equation has a family of exact Kolmogorov-type solutions governed by the fluxes of motion constants: wave action, energy, and momentum. The simple "local" model for S(nl) term that is equivalent to the "diffusion approximation" is studied in details. In this case, Kolmogorov spectra are found in the explicit form. We show that a general solution of the stationary kinetic equation behind the spectral peak is described by the Kolmogorov-type solution with frequency-dependent fluxes. The domains of "inverse cascade" and "direct cascade" can be separated by natural way. The spectrum in the universal domain is close to $\\omega^{-4}$.

Zakharov, Vladimir E

2015-01-01T23:59:59.000Z

269

Why Is Nevada in Hot Water? Structural Controls and Tectonic Model of  

Open Energy Info (EERE)

Why Is Nevada in Hot Water? Structural Controls and Tectonic Model of Why Is Nevada in Hot Water? Structural Controls and Tectonic Model of Geothermal Systems in the Northwestern Great Basin Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Why Is Nevada in Hot Water? Structural Controls and Tectonic Model of Geothermal Systems in the Northwestern Great Basin Abstract In the western Great Basin, the Walker Lane is a system of right-lateral strike-slip faults accommodating ~15-25% of relative motion between the Pacific and North American plates. Relatively high rates of recent (<10 Ma) west-northwest extension absorb northwestward declining dextral motion in the Walker Lane, diffusing that motion into the Basin-Range. Abundant geothermal fields cluster in several northeasttrending belts in the

270

Tectonic fibrous veins: initiation and evolution. Ouachita Orogen, Arkansas  

E-Print Network [OSTI]

1B). Miser (1959) observed that the veins in this region follow faults, bedding planes and fractures, the latter cutting across folds. The structural setting of the veins in the Ouachitas suggest that the veins are synorogenic (Nielsen et al... 1B). Miser (1959) observed that the veins in this region follow faults, bedding planes and fractures, the latter cutting across folds. The structural setting of the veins in the Ouachitas suggest that the veins are synorogenic (Nielsen et al...

Cervantes, Pablo

2009-05-15T23:59:59.000Z

271

Risk-aware Attacks and Catastrophic Cascading Failures in U.S. Power Grid  

E-Print Network [OSTI]

Risk-aware Attacks and Catastrophic Cascading Failures in U.S. Power Grid Wenkai Wang, Qiao Cai Department, Stevens Institute of Technology, Hoboken, NJ 07030 Abstract--The power grid network is a complex of power grid in terms of cascading failures caused by node failures. Specifically, we define three metrics

Sun, Yan Lindsay

272

A Five-Level Three-Phase Hybrid Cascade Multilevel Inverter Using a Single DC Source  

E-Print Network [OSTI]

A Five-Level Three-Phase Hybrid Cascade Multilevel Inverter Using a Single DC Source for a PM to construct a 3-phase 5-level cascade multilevel inverter to be used as a drive for a PM traction motor. The 5-level inverter consists of a standard 3-leg inverter (one leg for each phase) and an H-bridge in series

Tolbert, Leon M.

273

Hybrid Cascaded H-bridges Multilevel Motor Drive Control for Electric Vehicles  

E-Print Network [OSTI]

Hybrid Cascaded H-bridges Multilevel Motor Drive Control for Electric Vehicles Zhong Du1 , Leon M vehicle motor drive applications and hybrid electric vehicle motor drive applications. Keywords: hybrid cascaded H-bridge multilevel converter, DC voltage balance control, multilevel motor drive, electric

Tolbert, Leon M.

274

Mode tuning of quantum cascade lasers through optical processing of chalcogenide glass claddings  

E-Print Network [OSTI]

. The nature of gas-sensing applications requires single- mode operation and good tunability. One wayMode tuning of quantum cascade lasers through optical processing of chalcogenide glass claddings July 2006 In this letter, we demonstrate a method of tuning quantum cascade QC lasers by modifying

Arnold, Craig B.

275

A quantum cascade laser fabricated using planar native-oxide layers C. D. Farmera)  

E-Print Network [OSTI]

of quantum cascade lasers. The native oxide of the Al0.48In0.52As upper cladding layer was formed and usedA quantum cascade laser fabricated using planar native-oxide layers C. D. Farmera) Department to provide electrical and optical confinement for lasers operating at 5 m. Initial results include 1.4 W peak

276

Design of Microsecond Level and High Current Pulse Driver Systems for Quantum Cascade Lasers  

Science Journals Connector (OSTI)

This paper presents a microsecond, high current pulse generator to drive quantum cascade lasesrs. The driver systems consist of pulse generator; power amplifier; fast switches and constant current supply circuits. The pulse width and pulse repetition ... Keywords: microsecond level, high current, pulesd driver systems, quantum cascade laser

Lei Li; Chen Chen; Hai Yu; Chengjun Dong; Yiding Wang

2010-06-01T23:59:59.000Z

277

Ugi post-condensation copper-triggered oxidative cascade towards pyrazoles  

E-Print Network [OSTI]

1310 Ugi post-condensation copper-triggered oxidative cascade towards pyrazoles Aurélie Dos Santos-component Ugi coupling, the resulting hydrazone was engaged in a copper triggered [3 + 2] cycloaddition/aerobic oxidation cascade. 1310 Introduction In the last twenty years, the Ugi reaction coupled with its various

Paris-Sud XI, Université de

278

Universal Laws of Cascade of Turbulent Fluctuations ZhenSu She  

E-Print Network [OSTI]

1 Universal Laws of Cascade of Turbulent Fluctuations Zhen­Su She Department of Mathematics interactions. As fluctuations cascade, both mechanical law and statistical law are important to determine that the fundamental mechanical conception of the nature was doubteful when such phenomena as the heat radiation

Soatto, Stefano

279

Transient dynamics and foodweb complexity in the LotkaVolterra cascade model  

Science Journals Connector (OSTI)

...research-article Transient dynamics and food-web complexity in the Lotka-Volterra cascade...behaviour near equilibrium of model food webs correlate with their short-term transient...Lotka-Volterra cascade model of food webs provide the first evidence to answer this...

2001-01-01T23:59:59.000Z

280

Cascadability and reshaping properties of a saturable absorber inserted inside a RZ transmission line for future  

E-Print Network [OSTI]

absorber component cascaded into a 100-km SMF RZ transmission line in order to annihilate the ghost paid to transmission lines working at higher bit-rates, such as 160 Gbit/s [1]. However, many studies Absorber device cascaded inside a 100-km Single Mode Fiber (SMF)- based RZ transmission line cadenced

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "region cascades tectonic" 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.


281

Number and propagation of line outages in cascading events in electric power transmission systems  

E-Print Network [OSTI]

Number and propagation of line outages in cascading events in electric power transmission systems of transmission lines. We estimate from observed utility data how transmission line outages propagate, and obtain of transmission lines. The multiple mechanisms involved these cascading outages are many and varied, and the power

Dobson, Ian

282

Regional Purchasing  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Regional Purchasing Regional Purchasing Regional Purchasing Pursuant to Appendix M of Prime Contract No. DE-AC52-06NA25396 between DOE/NNSA and Los Alamos National Security, LLC (LANS), LANS is committed to building a strong supplier base with Northern New Mexico businesses and the local Native American pueblos in the purchases of goods and services. Contact Small Business Office (505) 667-4419 Email We seek out and utilize known Northern New Mexico business as suppliers The Northern New Mexico counties included are Los Alamos Santa Fe Rio Arriba Taos Mora San Miguel Sandoval The eight regional pueblos included are Nambe Ohkay Owingeh (formerly known as San Juan) Picuris Pojoaque San Ildefonso Santa Clara Taos Tesuque When the Laboratory cannot identify regional firms, it will expand its

283

Stabilization, Injection and Control of Quantum Cascade Lasers, and Their Appli-cation to Chemical Sensing in the Infrared  

SciTech Connect (OSTI)

Quantum cascade lasers (QCLs) are a relatively new type of semiconductor laser operating in the mid- to long-wave infrared. These monopolar multilayered quantum well structures can be fabricated to operate anywhere between 3.5 microns and 20 microns, which includes the molecular fingerprint region of the in-frared. This makes them an ideal choice for infrared chemical sensing, a topic of great interest at present. Frequency stabilization and injection locking increase the utility of QCLs. We present results of locking quantum cascade lasers to optical cavities, achieving relative linewidths down to 5.6 Hz. We report injec-tion locking of one distributed feedback grating QCL with light from a similar QCL, demonstrating capture ranges of up to 500 MHz, and suppression of amplitude modulation by up to 49 dB. We also present various cavity-enhanced chemical sensors employing the frequency stabilization techniques developed, in-cluding the resonant sideband technique known as Nice-Ohms. Sensitivities of 9.7 x 10-11 cm-1 Hz-1/2 have been achieved in nitrous oxide.

Taubman, Matthew S.; Myers, Tanya L.; Cannon, Bret D.; Williams, Richard M.

2004-12-01T23:59:59.000Z

284

Inductorless DC-AC Cascaded H-bridge Multilevel Boost Inverter for Electric/Hybrid Electric Vehicle  

E-Print Network [OSTI]

Inductorless DC-AC Cascaded H-bridge Multilevel Boost Inverter for Electric/Hybrid Electric Vehicle University Boise, ID 83725, USA Abstract-This paper presents an inductorless cascaded H- bridge multilevel a bulky inductor. An inductorless cascaded H-bridge multilevel boost inverter for EV and HEV applications

Tolbert, Leon M.

285

Cascade Natural Gas - Conservation Incentives for Existing Homes |  

Broader source: Energy.gov (indexed) [DOE]

Existing Homes Existing Homes Cascade Natural Gas - Conservation Incentives for Existing Homes < Back Eligibility Residential Savings Category Home Weatherization Commercial Weatherization Sealing Your Home Ventilation Heating & Cooling Commercial Heating & Cooling Heating Appliances & Electronics Water Heating Program Info State District of Columbia Program Type Utility Rebate Program Rebate Amount Floor Insulation: $0.45 per sq. ft. Wall Insulation: $0.40 per sq. ft. Ceiling or Attic Insulation: $0.25 per sq. ft. High Efficiency Natural Gas Furnace: $150 Duct Sealing: $150 High Efficiency Natural Gas Furnace and Duct Sealing: $400 High Efficiency Natural Gas Hearth: $70 Conventional Natural Gas Water Heater: $40 Combination Domestic Water/Hydronic Space Heating System (using Tankless

286

Collision cascades and sputtering induced by larger cluster ions  

SciTech Connect (OSTI)

Recent experimental work on larger cluster impact on solid surfaces suggests large deviations from the standard case of additive sputter yields both in the nuclear and electronic stopping regime. The paper concentrates on elastic collision cascades. In addition to very pronounced spike effects, two phenomena are pointed out that are specific to cluster bombardment. Multiple hits of cluster atoms on one and the same target atom may result in recoil atoms that move faster than the maximum recoil speed for monomer bombardment at the same projectile speed. This effect is important when the atomic mass of a beam atom is less than that of a target atom, M1 << M2. In the opposite case, M1 >> M2, collisions between beam particles may accelerate some beam particles and slow down others. Some consequences are mentioned. Remarks on the nuclear stopping power of larger clusters and on electronic sputtering by cluster bombardment conclude the paper. 38 refs., 2 figs.

Sigmund, P.

1988-01-01T23:59:59.000Z

287

Advanced quantum cascade laser transmitter architectures and infrared photonics development  

SciTech Connect (OSTI)

Quantum cascade lasers (QCLs) provide a viable infrared laser source for a new class of laser transmitters capable of meeting the performance requirements for a variety of national security and civilian applications. The high output power, small size, and superb stability and modulation characteristics of QCLs make them amenable for integration as transmitters into ultra-sensitive, ultra-selective point sampling and remote short-range chemical sensors. This paper reports on the current development in infrared photonics that provides a pathway for QCL transmitter miniaturization. This research has produced infrared waveguide-based optical components in chalcogenide glass using both direct-laser writing and holographic exposure techniques. We discuss here the design and fabrication concepts and capabilities required to produce integrated waveguides, waveguide couplers, and other photonic devices.

Anheier, Norman C.; Allen, Paul J.; Myers, Tanya L.

2004-08-01T23:59:59.000Z

288

Analytical investigation of the dynamics behaviors of quantum cascade laser  

Science Journals Connector (OSTI)

Abstract In this paper, we investigate analytically and numerically the transient dynamics of the mid-infrared quantum cascade laser operating in a single mode. The approach is based on using adiabatic elimination in the rate equations model. Analytical solutions are derived for steady-state and time-dependent number of electrons in the various levels, population inversion and number of photons in the cavity. In addition, the equation that allows for the determination of time for steady-state establishment is derived within the premises of our analytical model in the most general case. The results are compared with numerical calculations. The dependence of the buildup time on current injection is also examined and compared with our other existing model.

A. Hamadou

2015-01-01T23:59:59.000Z

289

Controllable discrete diffraction in cascade-induced waveguides  

SciTech Connect (OSTI)

A new method for generating periodic lattices in quadratically nonlinear media by the three-wave cascade interaction is proposed. This method allows one to obtain stable structures with changeable parameters. These structures make it possible to realise the all-optical control of the character of the laser beam propagation. The use of the discrete diffraction allows the signal multiplexing in optical processing and information transfer devices and the control of the number of channels at the crystal output. The effect of the discrete diffraction anisotropy in the system of induced waveguides makes it possible to redistribute in the specified way the energy in the channels at the output. It is shown that the optical switching efficiency is maximal in the regime of the transverse Bragg resonance. The signal switching rate in optical lattices induced in a quadratically nonlinear medium is limited by the time of light propagation though the crystal and can achieve several terahertz. (nonlinear optical phenomena)

Borovkova, O V; Lobanov, V E; Sukhorukov, Anatolii P [M. V. Lomonosov Moscow State University, Faculty of Physics, Moscow (Russian Federation); Sukhorukova, A K [Russian State Geological Prospecting University, Moscow (Russian Federation)

2009-11-30T23:59:59.000Z

290

Multicomponent cnoidal waves in cascade parametric frequency conversion  

SciTech Connect (OSTI)

It is shown that four-mode interaction in quasi-synchronous cascade frequency conversion on a quadratic nonlinearity can be described in terms of an effective cubic nonlinearity, which reduces the problem to solving the system of two coupled nonlinear Schroedinger equations (NSEs) with respect to the amplitudes of waves involved in both nonlinear processes. Analytic solutions of a new type found for this system have the form of cnoidal waves with components representing the sum and difference of the identical fundamental solutions of the NSE with shifted arguments. The obtained solutions cover the entire range of variation of boundary conditions, allowing the optimisation of the conversion efficiency in any particular situation. (nonlinear optical phenomena)

Petnikova, V M; Shuvalov, Vladimir V [International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)

2008-12-31T23:59:59.000Z

291

Cascaded injection resonator for coherent beam combining of laser arrays  

DOE Patents [OSTI]

The invention provides a cascaded injection resonator for coherent beam combining of laser arrays. The resonator comprises a plurality of laser emitters arranged along at least one plane and a beam sampler for reflecting at least a portion of each laser beam that impinges on the beam sampler, the portion of each laser beam from one of the laser emitters being reflected back to another one of the laser emitters to cause a beam to be generated from the other one of the laser emitters to the beam reflector. The beam sampler also transmits a portion of each laser beam to produce a laser output beam such that a plurality of laser output beams of the same frequency are produced. An injection laser beam is directed to a first laser emitter to begin a process of generating and reflecting a laser beam from one laser emitter to another laser emitter in the plurality. A method of practicing the invention is also disclosed.

Kireev, Vassili [Sunnyvale, CA; Liu, Yun; Protopopescu, Vladimir [Knoxville, TN; Braiman, Yehuda [Oak Ridge, TN

2008-10-21T23:59:59.000Z

292

City of Cascade Locks, Oregon (Utility Company) | Open Energy Information  

Open Energy Info (EERE)

Oregon (Utility Company) Oregon (Utility Company) Jump to: navigation, search Name City of Cascade Locks Place Oregon Utility Id 3136 Utility Location Yes Ownership M NERC Location WECC NERC WECC Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png General Service- City Commercial General Service- City(Primary Metering) Commercial General Service- Rural Commercial General Service- Rural(Primary Metering) Commercial Public Agency Rate- City Commercial Public Agency Rate- City(Primary Metering) Commercial Public Agency Rate- Rural Commercial Public Agency Rate- Rural(Primary Metering) Commercial

293

LNG cascading damage study. Volume I, fracture testing report.  

SciTech Connect (OSTI)

As part of the liquefied natural gas (LNG) Cascading Damage Study, a series of structural tests were conducted to investigate the thermal induced fracture of steel plate structures. The thermal stresses were achieved by applying liquid nitrogen (LN{sub 2}) onto sections of each steel plate. In addition to inducing large thermal stresses, the lowering of the steel temperature simultaneously reduced the fracture toughness. Liquid nitrogen was used as a surrogate for LNG due to safety concerns and since the temperature of LN{sub 2} is similar (-190 C) to LNG (-161 C). The use of LN{sub 2} ensured that the tests could achieve cryogenic temperatures in the range an actual vessel would encounter during a LNG spill. There were four phases to this test series. Phase I was the initial exploratory stage, which was used to develop the testing process. In the Phase II series of tests, larger plates were used and tested until fracture. The plate sizes ranged from 4 ft square pieces to 6 ft square sections with thicknesses from 1/4 inches to 3/4 inches. This phase investigated the cooling rates on larger plates and the effect of different notch geometries (stress concentrations used to initiate brittle fracture). Phase II was divided into two sections, Phase II-A and Phase II-B. Phase II-A used standard A36 steel, while Phase II-B used marine grade steels. In Phase III, the test structures were significantly larger, in the range of 12 ft by 12 ft by 3 ft high. These structures were designed with more complex geometries to include features similar to those on LNG vessels. The final test phase, Phase IV, investigated differences in the heat transfer (cooling rates) between LNG and LN{sub 2}. All of the tests conducted in this study are used in subsequent parts of the LNG Cascading Damage Study, specifically the computational analyses.

Petti, Jason P.; Kalan, Robert J.

2011-12-01T23:59:59.000Z

294

CONVERGENT AND COLLISIONAL TECTONICS IN PARTS OF OREGON, MAINE, AND THE VERMONT-QUEBEC BORDER  

E-Print Network [OSTI]

CONVERGENT AND COLLISIONAL TECTONICS IN PARTS OF OREGON, MAINE, AND THE VERMONT- QUEBEC BORDER IN PARTS OF OREGON, MAINE, AND THE VERMONT - QUEBEC BORDER by Adam Schoonmaker Abstract of a Dissertation history and structural evolution of the Stanbridge Group in southern Quebec, and the correlative Highgate

Kidd, William S. F.

295

Clockwise rotation of the Brahmaputra Valley relative to India: Tectonic convergence  

E-Print Network [OSTI]

Clockwise rotation of the Brahmaputra Valley relative to India: Tectonic convergence in the eastern, Bangalore, India Abstract GPS data reveal that the Brahmaputra Valley has broken from the Indian Plate and rotates clockwise relative to India about a point a few hundred kilometers west of the Shillong Plateau

Demouchy, Sylvie

296

Estimation of methane flux offshore SW Taiwan and the influence of tectonics on gas hydrate accumulation  

E-Print Network [OSTI]

Estimation of methane flux offshore SW Taiwan and the influence of tectonics on gas hydrate simulating reflectors (BSRs) imply the potential existence of gas hydrates offshore southwestern Taiwan that the fluxes are very high in offshore southwestern Taiwan. The depths of the SMI are different at sites GH6

Lin, Andrew Tien-Shun

297

Plate tectonics at an awkward junction: rules for the evolution of Sovanco Ridge area, NE Pacific  

Science Journals Connector (OSTI)

......offshorecompression in Winona basin. The spreading-centre terminating...fault does not strike into the bight of the Juan de Fuca strait...it occurs (such as in Winona basin: Davis & Riddihough 1982...Riddihough, R., 1982. The Winona basin: structure and tectonics......

C. R. B. Lister

1989-02-01T23:59:59.000Z

298

The eustatic and tectonic origin of Neogene unconformities from the Great Australian Bight  

E-Print Network [OSTI]

The eustatic and tectonic origin of Neogene unconformities from the Great Australian Bight Q. Li a. Keywords: Miocene^Pliocene; Great Australian Bight; ODP Leg 182; third-order sequence; sea level the slope and continental rise of the Great Australian Bight (GAB) (Feary et al., 2000) (Fig. 1). Using

Li, Qianyu

299

The tectonic evolution of the Southern Alps, New Zealand: insights from fully thermally coupled dynamical modelling  

Science Journals Connector (OSTI)

......The possible contribution of frictional heating to the geothermal regime of the Southern...is well established from measurements in oil exploration drillholes, only two measurements...Nappe Tectonics, eds McClay, K.R. Price, N.J., Spec. Publ. Geol. Soc......

Geoffrey E. Batt; Jean Braun

1999-02-01T23:59:59.000Z

300

Master1RservoirsGologiquesDynamiquedesBassins-MichelSranne Post-rift tectonics on passive margins  

E-Print Network [OSTI]

postrift ? South Gabon 38 Master1RéservoirsGéologiquesDynamiquedesBassins-MichelSéranne Parameters : Niger delta evaporites décollement : Gabon margin 40 Master1Réservoirs view Evaporites = décollement shortening extension Salt tectonics = fonction (slope & load) Gabon

Demouchy, Sylvie

Note: This page contains sample records for the topic "region cascades tectonic" 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

Miocene faulting at plate tectonic velocity in the Himalaya of central Nepal  

E-Print Network [OSTI]

Miocene faulting at plate tectonic velocity in the Himalaya of central Nepal Matthew J. Kohna, Tri-Chandra Campus, Ghantaghar, Kathmandu, Nepal, United States Received 7 April 2004; received (MCT) and affiliated faults in central Nepal. Inferred rates were 1.5F0.9 cm/yr (Langtang Thrust, ~19

302

Oil and Gas CDT Gas hydrate distribution on tectonically active continental  

E-Print Network [OSTI]

Oil and Gas CDT Gas hydrate distribution on tectonically active continental margins: Impact on gas. Gregory F. Moore, University of Hawaii (USA) http://www.soest.hawaii.edu/moore/ Key Words Gas Hydrates, Faults, Fluid Flow, gas prospectivity Overview Fig. 1. Research on gas hydrates is often undertaken

Henderson, Gideon

303

Regional Inventories  

Gasoline and Diesel Fuel Update (EIA)

5 5 Notes: This year has not started well for gasoline inventories, with inventories being low across regions of the country. The Midwest region (PADD II) had been running lower than most regions, but began to catch up during the last week in April. Gasoline inventories ran about 9% below their 5-year average for this time of year and about 4% below where they were last year. The recent refinery problems in the Midwest, though, could erase some of that recovery. The impacts of Tosco's Wood River refinery and Marathon's St Paul refinery are not fully realized. But inventories were also precariously low along the East Coast (PADD I) and are extremely low in the Rocky Mountain region (PADD IV), although the size of this market mitigates any national impact. While the

304

Long wave infrared cavity-enhanced sensors using quantum cascade lasers  

SciTech Connect (OSTI)

Quantum cascade lasers (QCLs) are becoming well known as convenient and stable semiconductor laser sources operating in the mid- to long-wave infrared, and are able to be fabricated to operate virtually anywhere in the 3.5 to 25 micron region. This makes them an ideal choice for infrared chemical sensing, a topic of great interest at present, spanning at least three critical areas: national security, environmental monitoring and protection, and the early diagnosis of disease through breath analysis. There are many different laser-based spectroscopic chemical sensor architectures in use today, from simple direct detection through to more complex and highly sensitive systems. Many current sensor needs can be met by combining QCLs and appropriate sensor architectures, those needs ranging from UAV-mounted surveillance systems, through to larger ultra-sensitive systems for airport security. In this paper we provide an overview of various laser-based spectroscopic sensing techniques, pointing out advantages and disadvantages of each. As part of this process, we include our own results and observations for techniques under development at PNNL. We also present the latest performance of our ultra-quiet QCL control electronics now being commercialized, and explore how using optimized supporting electronics enables increased sensor performance and decreased sensor footprint for given applications.

Taubman, Matthew S.; Scott, David C.; Myers, Tanya L.; Cannon, Bret D.

2005-12-30T23:59:59.000Z

305

Measurement of Broad Absorption Features Using a Tunable External Cavity Quantum Cascade Laser  

SciTech Connect (OSTI)

We demonstrate the use of a tunable external cavity quantum cascade laser system for measurement of broad absorption features in the mid-infrared spectral region. The thermoelectrically cooled external cavity laser was tuned over a 65 cm-1 range centered at 8.7 microns using stepper motor control. Pulsing the laser at a high duty cycle provided 3-5 mW average output power over the tuning range, and enabled phase-sensitive detection of amplitude-modulated signals. We used the laser system to measure the absorption spectra of Freon-125 using a Herriott cell. In addition, the absorption spectrum of water in the laboratory air was measured. The measurements showed excellent agreement with reference spectra, in both wavelength and amplitude. The measured scan resolution of 0.14 cm-1 is suitable for measurement of the absorption features of complex molecules as well as simple molecules with atmospherically broadened lines. We discuss the limits to the scan resolution due to effects of spectral chirp and mode-hops during pulsed operation.

Phillips, Mark C.; Myers, Tanya L.; Wojcik, Michael D.; Cannon, Bret D.; Taubman, Matthew S.; Scott, David C.

2007-09-25T23:59:59.000Z

306

Astrophysical gyrokinetics: kinetic and fluid turbulent cascades in magnetized weakly collisional plasmas  

E-Print Network [OSTI]

We present a theoretical framework for plasma turbulence in astrophysical plasmas (solar wind, interstellar medium, galaxy clusters, accretion disks). The key assumptions are that the turbulence is anisotropic with respect to the mean magnetic field and frequencies are low compared to the ion cyclotron frequency. The energy injected at the outer scale scale has to be converted into heat, which ultimately cannot be done without collisions. A KINETIC CASCADE develops that brings the energy to collisional scales both in space and velocity. Its nature depends on the physics of plasma fluctuations. In each of the physically distinct scale ranges, the kinetic problem is systematically reduced to a more tractable set of equations. In the "inertial range" above the ion gyroscale, the kinetic cascade splits into a cascade of Alfvenic fluctuations, which are governed by the RMHD equations at both the collisional and collisionless scales, and a passive cascade of compressive fluctuations, which obey a linear kinetic equation along the moving field lines associated with the Alfvenic component. In the "dissipation range" between the ion and electron gyroscales, there are again two cascades: the kinetic-Alfven-wave (KAW) cascade governed by two fluid-like Electron RMHD equations and a passive phase-space cascade of ion entropy fluctuations. The latter cascade brings the energy of the inertial-range fluctuations that was damped by collisionless wave-particle interaction at the ion gyroscale to collisional scales in the phase space and leads to ion heating. The KAW energy is similarly damped at the electron gyroscale and converted into electron heat. Kolmogorov-style scaling relations are derived for these cascades. Astrophysical and space-physical applications are discussed in detail.

A. A. Schekochihin; S. C. Cowley; W. Dorland; G. W. Hammett; G. G. Howes; E. Quataert; T. Tatsuno

2007-03-31T23:59:59.000Z

307

Simulation Modeling of an Enhanced Low-Emission Swirl-Cascade Burner  

SciTech Connect (OSTI)

''Cascade-burners'' is a passive technique to control the stoichiometry of the flame through changing the flow dynamics and rates of mixing in the combustion zone with a set of venturis surrounding the flame. Cascade-burners have shown advantages over other techniques; its reliability, flexibility, safety, and cost makes it more attractive and desirable. On the other hand, the application of ''Swirl-burners'' has shown superiority in producing a stable flame under a variety of operating conditions and fuel types. The basic idea is to impart swirl to the air or fuel stream, or both. This not only helps to stabilize the flame but also enhances mixing in the combustion zone. As a result, nonpremixed (diffusion) swirl burners have been increasingly used in industrial combustion systems such as gas turbines, boilers, and furnaces, due to their advantages of safety and stability. Despite the advantages of cascade and swirl burners, both are passive control techniques, which resulted in a moderate pollutant emissions reduction compared to SCR, SNCR and FGR (active) methods. The present investigation will study the prospects of combining both techniques in what to be named as ''an enhanced swirl-cascade burner''. Natural gas jet diffusion flames in baseline, cascade, swirl, and swirl-cascade burners were numerically modeled using CFDRC package. The thermal, composition, and flow (velocity) fields were simulated. The numerical results showed that swirl and cascade burners have a more efficient fuel/air mixing, a shorter flame, and a lower NOx emission levels, compared to the baseline case. The results also revealed that the optimal configurations of the cascaded and swirling flames have not produced an improved performance when combined together in a ''swirl-cascade burner''. The non-linearity and complexity of the system accounts for such a result, and therefore, all possible combinations, i.e. swirl numbers (SN) versus venturi diameter ratios (D/d), need to be considered.

Ala Qubbaj

2004-09-01T23:59:59.000Z

308

Geology and geothermal resources of the Santiam Pass area of the Oregon Cascade Range, Deschutes, Jefferson and Linn Counties, Oregon. Final report  

SciTech Connect (OSTI)

This open-file report presents the results of the Santiam Pass drilling program. The first phase of this program was to compile all available geological, geophysical and geothermal data for the Santiam Pass area and select a drill site on the basis of these data (see Priest and others, 1987a), A summary of the drilling operations and costs associated with the project are presented in chapter 1 by Hill and Benoit. An Overview of the geology of the Santiam Pass area is presented by Hill and Priest in chapter 2. Geologic mapping and isotopic age determinations in the Santiam Pass-Mount Jefferson area completed since 1987 are summarized in chapter 2. One of the more important conclusions reached in chapter 2 is that a minimum of 2 km vertical displacement has occurred in the High Cascade graben in the Santiam Pass area. The petrology of the Santiam Pass drill core is presented by Hill in chapter 3. Most of the major volcanic units in the core have been analyzed for major, minor, and trace element abundances and have been studied petrographically. Three K-Ar ages are interpreted in conjunction with the magnetostratigraphy of the core to show that the oldest rocks in the core are approximately 1.8 Ma. Geothermal and geophysical data collected from the Santiam Pass well are presented by Blackwell in chapter 4. The Santiam Pass well failed to penetrate beneath the zone of lateral groundwater flow associated with highly permeable Quaternary volcanic rocks. Calculated geothermal gradients range from about 50{degree}C/km at depth 700-900 m, to roughly 110{degree}C/km from 900 m to the bottom of the well at 929 m. Heat-flow values for the bottom part of the hole bracket the regional average for the High Cascades. Blackwell concludes that heat flow along the High Cascades axis is equal to or higher than along the western edge of the High Cascades.

Hill, B.E. [ed.

1992-10-01T23:59:59.000Z

309

Finite-size scaling of two-point statistics and the turbulent energy cascade generators  

Science Journals Connector (OSTI)

Within the framework of random multiplicative energy cascade models of fully developed turbulence, finite-size-scaling expressions for two-point correlators and cumulants are derived, taking into account the observationally unavoidable conversion from an ultrametric to an Euclidean two-point distance. The comparison with two-point statistics of the surrogate energy dissipation, extracted from various wind tunnel and atmospheric boundary layer records, allows an accurate deduction of multiscaling exponents and cumulants, even at moderate Reynolds numbers for which simple power-law fits are not feasible. The extracted exponents serve as input for parametric estimates of the probabilistic cascade generator. Various cascade generators are evaluated.

Jochen Cleve; Thomas Dziekan; Jrgen Schmiegel; Ole E. Barndorff-Nielsen; Bruce R. Pearson; Katepalli R. Sreenivasan; Martin Greiner

2005-02-28T23:59:59.000Z

310

Energy spectrum of cascade showers generated in water by near-horizontal muons  

Science Journals Connector (OSTI)

We discuss measuring cascade shower energy using the NEVOD Cherenkov water detector with ... applied to showers generated by near-horizontal high-energy muons selected using the DECOR coordinate detector deployed...

S. S. Khokhlov; N. S. Barbashina

2013-05-01T23:59:59.000Z

311

Summary of activities in the Working Group on QCD Cascades of the HERA Monte Carlo workshop  

E-Print Network [OSTI]

We summarize the activities in working group 10 concerned with QCD cascades, and find that although much work still needs to be done, much progress was made during this workshop in understanding the merits and deficiencies of different programs.

Nick Brook; Leif Lonnblad

1999-08-16T23:59:59.000Z

312

Summary of activities in the Working Group on QCD Cascades of the HERA Monte Carlo workshop  

E-Print Network [OSTI]

We summarize the activities in working group 10 concerned with QCD cascades, and find that although much work still needs to be done, much progress was made during this workshop in understanding the merits and deficiencies of different programs.

Brook, N; Brook, Nick; Lonnblad, Leif

1999-01-01T23:59:59.000Z

313

Improving the aerodynamic efficiency of blade profile cascade used in a cooled turbine  

Science Journals Connector (OSTI)

Good effect from using rotor blade cascades, the pressure sides profile of which has a bend near the trailing edge at an angle of no larger than 15, is confirmed from the results of experimental studies.

B. I. Mamaev; M. R. Valeev

2010-09-01T23:59:59.000Z

314

Dynamical Distribution of Capacities Strategy for Suppressing Cascading Failure in Power Grid  

Science Journals Connector (OSTI)

This paper studies the suppressing effect of Dynamical distribution of capacities (DDC) strategy in cascading failure of power grid. This strategy is proposed based on load characteristics and transmission method...

Zhi-Juan Jia; Yu Zhang; Cong Feng; Ming-Sheng Hu

2014-01-01T23:59:59.000Z

315

Advanced fault diagnosis techniques and their role in preventing cascading blackouts  

E-Print Network [OSTI]

This dissertation studied new transmission line fault diagnosis approaches using new technologies and proposed a scheme to apply those techniques in preventing and mitigating cascading blackouts. The new fault diagnosis approaches are based on two...

Zhang, Nan

2007-04-25T23:59:59.000Z

316

Finite-State Transducer Cascade to Extract Proper Names in Texts  

Science Journals Connector (OSTI)

This article describes a finite-state cascade for the extraction of person names in texts in French. We extract these proper names in order to categorize and to cluster texts with them. After a finite-state pr...

Nathalie Friburger; 1]Denis Maurel

2002-01-01T23:59:59.000Z

317

Good Cascade Impactor Practice (GCIP) and Considerations for In-Use Specifications  

Science Journals Connector (OSTI)

The multi-stage cascade impactor (CI) is widely used to determine aerodynamic particle size distributions (APSDs) of orally inhaled products. Its size-fractionating capability depends primarily on the size of ...

S. C. Nichols; J. P. Mitchell; C. M. Shelton; D. L. Roberts

2013-03-01T23:59:59.000Z

318

A cascaded photonic crystal fiber MachZehnder interferometer formed by extra electric arc discharges  

Science Journals Connector (OSTI)

In this paper, a cascaded MachZehnder interferometer based on a photonic crystal fiber is reported. It is demonstrated that by applying a small dose of extra arc discharge to the photonic crystal fiber sensin...

Y. Geng; X. Li; X. Tan; Y. Deng; Y. Yu

2011-03-01T23:59:59.000Z

319

Observation of cascaded two-photon-induced transitions between fluxoid states of a SQUID  

E-Print Network [OSTI]

We present evidence for transitions between fluxoid wells of a SQUID due to cascaded, two-photon processes. Such transitions are evidenced by an anomalous dependence on the transition rate from the one-photon resonant level ...

Han, Siyuan; Lukens, J. E.; Rouse, R.

2000-02-07T23:59:59.000Z

320

The Impact of the Topology on Cascading Failures in Electric Power Grids  

E-Print Network [OSTI]

Cascading failures are one of the main reasons for blackouts in power transmission grids. The topology of a power grid, together with its operative state determine, for the most part, the robustness of the power grid against cascading failures. Secure electrical power supply requires, together with careful operation, a robust design of the electrical power grid topology. This paper investigates the impact of a power grid topology on its robustness against cascading failures. Currently, the impact of the topology on a grid robustness is mainly assessed by using purely topological approaches that fail to capture the essence of electric power flow. This paper proposes a metric, the effective graph resistance, that relates the topology of a power grid to its robustness against cascading failures by deliberate attacks, while also taking the fundamental characteristics of the electric power grid into account such as power flow allocation according to Kirchoff Laws. Experimental verification shows that the proposed ...

Ko, Yakup; Van Mieghem, Piet; Kooij, Robert E; Brazier, Frances M T

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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

Numerical calculations of cosmic ray cascade in the Earth's atmosphere Results for nucleon spectra  

E-Print Network [OSTI]

such as production of cosmogenic nuc- lides, radiation dosimetry and single event upsets in the microelec- tronics [1 in the atmosphere. Some of the particles produced in the cascade can reach the Earth's surface and induce nuclear

322

Quantum-cascade laser photoacoustic detection of methane emitted from natural gas powered engines  

Science Journals Connector (OSTI)

In this work we present a laser photoacoustic arrangement for the detection of the important greenhouse gas methane. A quantum-cascade laser and a differential photoacoustic cell were ... tested in the detection ...

M. V. Rocha; M. S. Sthel; M. G. Silva; L. B. Paiva; F. W. Pinheiro

2012-03-01T23:59:59.000Z

323

Mixed Refrigerant Cascade Liquefiers for Natural GasDesign and Optimization  

Science Journals Connector (OSTI)

This paper describes the development of highly flexible calculation methods and computer programs to deal with the complex problems encountered in the design of Mixed Refrigerant Cascade (MRC) plants. The relativ...

D. T. Linnett; K. C. Smith

1995-01-01T23:59:59.000Z

324

The damped natural oscillations of a gas flowing past a cascade of flat plates  

Science Journals Connector (OSTI)

We solve the problem of the natural oscillations of a gas flowing past a cascade of flat plates under the Joukowsky-Chaplygin ... case part of the energy of the oscillating gas is consumed in the formation of a ....

V. B. Kurzin

325

SIMULATION MODELING OF AN ENHANCED LOW-EMISSION SWIRL-CASCADE BURNER  

SciTech Connect (OSTI)

Based on the physical and computational models outlined in the previous technical progress reports, Natural gas jet diffusion flames in baseline, cascade, swirl, and swirlcascade burners were numerically modeled. The thermal, composition, and flow (velocity) fields were simulated. The temperature, CO{sub 2} and O{sub 2} concentrations, as well as the axial and radial velocity profiles were computed and analyzed. The numerical results showed that swirl and cascade burners have a more efficient fuel/air mixing, a shorter flame, and a lower NOx emission levels, compared to the baseline case. The results also revealed that the optimal configurations of the cascaded and swirling flames have not produced an improved performance when combined together in a ''swirl-cascade burner''.

Ala Qubbaj

2004-04-01T23:59:59.000Z

326

Label Free Mid-IR Photothermal Imaging of Bird Brain With Quantum Cascade Laser  

Science Journals Connector (OSTI)

Label free mid-infrared photothermal imaging on bird brain slices is presented. The Amide-I vibrational band is excited by a quantum cascade laser and an Er:doped fiber measures the...

Mertiri, Alket; Totachawattana, Atcha; Liu, Hui; Hong, Mi K; Gardner, Tim; Sander, Michelle Y; Erramilli, Shyamsunder

327

Active hyperspectral imaging using a quantum cascade laser (QCL) array and digital-pixel focal  

E-Print Network [OSTI]

, D. L. Sivco, and A. Y. Cho, "Quantum cascade lasers," Phys. Today 55(5), 34 (2002). 13. Daylight Solutions, Inc., www.daylightsolutions.com; Block Engineering LLC, www.blockeng.com. 14. B. G. Lee, M. A

Capasso, Federico

328

Optimization of an External Cavity Quantum Cascade Laser for Chemical Sensing Applications  

SciTech Connect (OSTI)

We describe and characterize an external cavity quantum cascade laser designed for detection of multiple airborne chemicals, and used with a compact astigmatic Herriott cell for sensing of acetone and hydrogen peroxide.

Phillips, Mark C.; Bernacki, Bruce E.; Taubman, Matthew S.; Cannon, Bret D.; Schiffern, John T.; Myers, Tanya L.

2010-03-01T23:59:59.000Z

329

Design of Laser Transition Oscillator Strength for THz Quantum Cascade Lasers  

Science Journals Connector (OSTI)

The density matrix based model is employed to design number of THz quantum cascade lasers with various laser oscillator strengths. The optimum oscillator strength varies between 0.35...

Fathololoumi, Saeed; Dupont, Emmanuel; Laframboise, Sylvain R; Wasilewski, Zbigniew R; Ban, Dayan; Liu, Hc

330

Pulsed High Duty-Cycle Operation of ? ~ 8m Quantum Cascade Lasers  

Science Journals Connector (OSTI)

We report on high duty-cycle pulsed and burst-mode operation of ?~8m quantum cascade lasers under ambient conditions for photo-acoustic spectroscopy. An optimum in average optical...

Ko, Tiffany; Liu, Zhijun; Gmachl, Claire

331

Recent progress in high precision atmospheric trace gas instruments using mid-infrared quantum cascade lasers  

Science Journals Connector (OSTI)

We report results from high precision spectroscopic instruments for atmospheric trace gases using with mid-IR quantum cascade lasers. Numerous gases can be measured with 1s absorption...

McManus, John B; Zahniser, Mark; Nelson, David; McGovern, Ryan; Agnese, Mike

332

Strain-balanced quantum cascade lasers: influence of growth temperature on interface roughness and laser performance  

Science Journals Connector (OSTI)

Effect of substrate temperature on the performances of quantum cascade lasers operating at 4.6um is presented. Using a density matrix model results for different growth temperatures...

Bismuto, Alfredo; Terazzi, Romain; Beck, Mattias; Faist, Jerome

333

Spectroscopic detection of hazardous substances using broadband-tunable Quantum Cascade Lasers  

Science Journals Connector (OSTI)

External-Cavity-Quantum Cascade Lasers are attractive sources for mid-infrared spectroscopy. We demonstrate the possibilities offered by EC-QCLs by two examples: Standoff detection of...

Hugger, Stefan; Fuchs, Frank; Jarvis, Jan; Yang, Quankui; Driad, Rachid; Bronner, Wolfgang; Aidam, Rolf; Ostendorf, Ralf; Wagner, Joachim

334

Electron microscopy of GaAs/AlGaAs quantum cascade laser  

Science Journals Connector (OSTI)

The quantum cascade laser (QCL) is based on a different principle comparing to bipolar semiconductor lasers, because it uses only one type of ... electrons and therefore is called an unipolar laser.

A. ?aszcz; J. Ratajczak; A. Czerwinski

2008-01-01T23:59:59.000Z

335

Near-Infrared Laser Pulse Induced Amplitude Modulation of Terahertz Quantum Cascade Lasers  

Science Journals Connector (OSTI)

We have demonstrated amplitude modulation of terahertz quantum cascade lasers by means of the injection of near-infrared laser pulses. Injected 770nm and 1350nm laser pulses both...

Sakasegawa, Yohei; Saito, Shingo; Sekine, Norihiko; Ashida, Masaaki; Hosako, Iwao

336

Superconducting Microbolometer with Microsecond Time Constant Coupled to Quantum Cascade Lasers  

Science Journals Connector (OSTI)

A superconducting bolometer with an on-chip lithographic terahertz antenna has been illuminated by two quantum cascade lasers operating at 2.5 and 4.4 THz to be used for wide dynamic...

Cibella, Sara; Ortolani, Michele; Leoni, Roberto; Torrioli, Guido; Tredicucci, Alessandro; Mahler, L; Xu, Ji-Hua; Beere, H E; Ritchie, D A

337

Gain to Absorption Ratio of Self-Induced Transparency Modelocked Quantum Cascade Lasers  

Science Journals Connector (OSTI)

A model to calculate the gain to absorption ratio of self-induced transparency modelocked quantum cascade lasers is presented and then used to find the gain to absorbing periods ratio...

Talukder, Muhammad; Menyuk, Curtis

338

Development of a compact quantum cascade laser spectrometer for field measurements of CO2 isotopes  

Science Journals Connector (OSTI)

We report the development of a field-deployable, pulsed quantum cascade laser spectrometer. The instrument is designed to measure...13C/12C isotopic ratio in the CO2 released from volcanic vents. Specific 12CO2 a...

D. Weidmann; G. Wysocki; C. Oppenheimer; F.K. Tittel

2005-02-01T23:59:59.000Z

339

Intra-pulse beam steering in a mid-infrared quantum cascade laser  

Science Journals Connector (OSTI)

The intra-pulse measurements of the beam steering in an AlGaAs/GaAs quantum cascade laser are presented in this paper. The experimental ... theoretical model. The near field of the laser radiation is calculated a...

Emilia Pruszy?ska-Karbownik; Kazimierz Regi?ski

2014-08-01T23:59:59.000Z

340

Lateral Current Density Distribution and Spatial Hole Burning in Quantum Cascade Lasers  

Science Journals Connector (OSTI)

We have investigated non-uniformity of the lateral current density and lateral hole burning in Quantum Cascaded lasers, e.g., the current density in the mode center is 1.8 times that...

Huang, Xue; Dikmelik, Yamac; Gmachl, Claire F

Note: This page contains sample records for the topic "region cascades tectonic" 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.


341

Hyperspectral microscopy using an external cavity quantum cascade laser and its applications for explosives detection  

SciTech Connect (OSTI)

A hyperspectral infrared microscope using external cavity quantum cascade laser illumination and a microbolometer focal plane array is used to characterize nanogram-scale particles of the explosives RDX, tetryl, and PETN at fast acquisition rates.

Phillips, Mark C.; Suter, Jonathan D.; Bernacki, Bruce E.

2012-04-01T23:59:59.000Z

342

Direct Modulation of Quantum Cascade Lasers for Chirped Laser Dispersion Spectroscopy  

Science Journals Connector (OSTI)

This paper provides an analysis of direct modulation of a quantum cascade laser for applications in chirped laser dispersion spectroscopy (CLaDS). The developed laser model is used to...

Hangauer, Andreas; Spinner, Georg; Nikodem, Michal; Wysocki, Gerard

343

Sensitive detection of acrolein and acrylonitrile with a pulsed quantum-cascade laser  

Science Journals Connector (OSTI)

We report on spectroscopic measurements of acrolein and acrylonitrile at atmospheric pressure using a pulsed distributed feedback quantum-cascade laser in combination with intra- and inter-pulse...?1. In the inte...

J. Manne; A. Lim; J. Tulip; W. Jger

2012-05-01T23:59:59.000Z

344

A multi-tiered memetic multiobjective evolutionary algorithm for the design of quantum cascade lasers  

Science Journals Connector (OSTI)

Recent advances in quantum cascade lasers (QCLs) have enabled their use as (tunable) emission sources for chemical and biological spectroscopy, as well as allowed their demonstration in applications in medical diagnostics and potential homeland security ...

Mark P. Kleeman; Gary B. Lamont; Adam Cooney; Thomas R. Nelson

2007-03-01T23:59:59.000Z

345

Sub-ppb detection of formaldehyde with cantilever enhanced photoacoustic spectroscopy using quantum cascade laser source  

Science Journals Connector (OSTI)

A novel cantilever enhanced photoacoustic spectrometer with mid-infrared quantum cascade laser was applied for selective and sensitive formaldehyde...2O) gas measurement. The spectrum of formaldehyde was measured...

C. B. Hirschmann; J. Lehtinen; J. Uotila; S. Ojala; R. L. Keiski

2013-06-01T23:59:59.000Z

346

The Influence of Doping on the Performance of Terahertz Quantum-Cascade-Lasers  

Science Journals Connector (OSTI)

We present the effects of the doping concentration on a set of terahertz quantum-cascade-lasers emitting around 2.75 THz. The threshold current density decreases linearly with the...

Benz, Alexander; Fasching, Gernot; Andrews, Aaron Maxwell; Unterrainer, Karl; Roch, Tomas; Schrenk, Werner; Strasser, Gottfried

347

Quantum Cascade Laser Technology for the Ultrasensitive Detection of Low-Level Nitric Oxide  

Science Journals Connector (OSTI)

Several spectroscopic methods based on mid-infrared quantum cascade lasers for the ultrasensitive detection of nitric oxide ... the most effective techniques, i.e., laser absorption spectroscopy, cavity-enhanced ...

Angela Elia; Pietro Mario Lugar; Cinzia Di Franco; Vincenzo Spagnolo

2011-01-01T23:59:59.000Z

348

Quantum cascade laser-based carbon monoxide detection on a second time scale from human breath  

Science Journals Connector (OSTI)

We present three different detection schemes for measuring carbon monoxide (CO) in direct absorption using a thermoelectrically cooled, distributed-feedback pulsed quantum cascade (qc) laser operating between 217...

B.W.M. Moeskops; H. Naus; S.M. Cristescu; F.J.M. Harren

2006-03-01T23:59:59.000Z

349

Synthesis of Marine Polycyclic Polyethers via Endo-Selective Epoxide-Opening Cascades  

E-Print Network [OSTI]

The proposed biosynthetic pathways to ladder polyethers of polyketide origin and oxasqualenoids of terpenoid origin share a dramatic epoxide-opening cascade as a key step. Polycyclic structures generated in these biosynthetic ...

Vilotijevic, Ivan

350

Surface-emitting distributed feedback terahertz quantum-cascade phase-locked laser arrays  

E-Print Network [OSTI]

A new approach to achieve high-power, symmetric beam-pattern, single-mode THz emission from metal-metal waveguide quantum-cascade laser is proposed and implemented. Several surface-emitting distributed feedback terahertz ...

Kao, Tsung-Yu

2009-01-01T23:59:59.000Z

351

High-Power Thermoelectrically-Cooled and Uncooled Mid-Wave Infrared Quantum Cascade Lasers  

Science Journals Connector (OSTI)

We present high performance thermoelectrically-cooled and uncooled mid-wave infrared (?=4.6 ?m) quantum cascade lasers with continuous-wave output power of 2.9 W and 1 W at room...

Maulini, Richard; Lyakh, Arkadiy; Tsekoun, Alexei; Pflugl, Christian; Diehl, Laurent; Capasso, Federico; Patel, Kumar

352

Quantum mechanical model of the upper bounds of the cascading contribution to the second hyperpolarizability  

SciTech Connect (OSTI)

Microscopic cascading of second-order nonlinearities between two molecules has been proposed to yield an enhanced third-order molecular nonlinear-optical response. In this contribution, we investigate the two-molecule cascaded second hyperpolarizability and show that it will never exceed the fundamental limit of a single molecule with the same number of electrons as the two-molecule system. We show the apparent divergence behavior of the cascading contribution to the second hyperpolarizability vanishes when properly taking into account the intermolecular interactions. Although cascading can never lead to a larger nonlinear-optical response than a single molecule, it provides alternative molecular design configurations for creating materials with large third-order susceptibilities that may be difficult to design into a single molecule.

Dawson, Nathan J.; Anderson, Benjamin R.; Schei, Jennifer L.; Kuzyk, Mark G. [Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814 (United States)

2011-10-15T23:59:59.000Z

353

Heat Flow From Four New Research Drill Holes In The Western Cascades...  

Open Energy Info (EERE)

Four New Research Drill Holes In The Western Cascades, Oregon, Usa Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Heat Flow From Four New...

354

A Cascade-Type Global Energy Conversion Diagram Based on WaveMean Flow Interactions  

Science Journals Connector (OSTI)

A cascade-type energy conversion diagram is proposed for the purpose of diagnosing the atmospheric general circulation based on wavemean flow interactions. Mass-weighted isentropic zonal means facilitate the expression of nongeostrophic wave ...

Sachiyo Uno; Toshiki Iwasaki

2006-12-01T23:59:59.000Z

355

Cascade Model of an Anomaly in Blazar Spectra at Very High Energy  

E-Print Network [OSTI]

It is well known that the effect of gamma-ray absorption on extragalactic background light (EBL) is weakly expressed in the spectra of some blazars. It is shown that a secondary component generated by electromagnetic cascades might considerably decrease the statistical significance of this anomaly. Observational results indicate the existence of the cascade component in the spectra of extragalactic gamma-ray sources, thus supporting the proposed model.

Dzhatdoev, Timur

2015-01-01T23:59:59.000Z

356

Molecular-beam epitaxy growth and characterization of mid-infrared quantum cascade laser structures  

Science Journals Connector (OSTI)

The development of molecular-beam epitaxy (MBE) of GaAs/AlGaAs heterostructures, used for fabrication of ~9?m quantum cascade lasers (QCLs), is reported. The X-ray diffractometry (XRD) structural characterization, as an integral part of this process, ... Keywords: GaAs/AlGaAs lasers, Intersubband transitions, Mid-infrared, Molecular-beam epitaxy, Quantum cascade laser, Unipolar devices

Kamil Kosiel; Justyna Kubacka-Traczyk; Piotr Karbownik; Anna Szerling; Jan Muszalski; Maciej Bugajski; Przemek Romanowski; Jaros?aw Gaca; Marek Wjcik

2009-03-01T23:59:59.000Z

357

Gamma-ray cascade transitions from resonant neutron capture in Cd-111 and Cd-113  

SciTech Connect (OSTI)

A neutron-capture experiment on {sup nat}Cd has been carried out at DANCE. Multiple-fold coincidence {gamma}-ray spectra have been collected from J=0, 1 resonances in {sup 111}Cd and {sup 113}Cd. The cascades ending at the ground state can be described by the SLO model while the cascades ending at the 2+ states are better reproduced by the mixed SLO+KMF model.

Rusev, Gencho Y. [Los Alamos National Laboratory

2012-08-27T23:59:59.000Z

358

Center for volcanic and tectonic studies, Department of Geoscience, Univ. of Nevada, Las Vegas, NV. Annual report No. 69, October 1, 1991--September 30, 1992  

SciTech Connect (OSTI)

The annual report of the Center for Volcanic and Tectonic Studies (CVTS) contains a series of papers, maps, and reprints that review the progress made by the CVTS between October 1, 1991 and December 31, 1992. During this period CVTS staff focused on several topics that had direct relevance to volcanic hazards related to the proposed high-level nuclear waste repository at Yucca Mountain, Nevada. These topics included: (1) The role of the mantle during regional extension. (2) The structural controls and emplacement mechanisms of Pliocene/Quaternary basaltic centers and dikes. (3) The detailed geochemistry of individual volcanic centers in Crater Flat, Nevada. (4) Estimating the probability of disruption of the proposed repository by volcanic eruption (this topic is being studied by Dr. C-H. Ho at UNLV).

Smith, E.I.

1992-12-15T23:59:59.000Z

359

The critical tension in the Cascading DGP model  

E-Print Network [OSTI]

We study the behaviour of weak gravitational fields in the 6D Cascading DGP model using a bulk-based approach. To deal with the ambiguity in the thin limit of branes of codimension higher than one, we consider a specific regularization of the internal structure of the branes where the 5D brane can be considered thin with respect to the 4D one. We consider the solutions corresponding to pure tension sources on the 4D brane, and study perturbations at first order around these background solutions. We adopt a 4D scalar-vector-tensor decomposition, and focus on the scalar sector of perturbations. We show that, in a suitable 4D limit, the trace part of the 4D metric perturbations obeys a decoupled equation which suggests that it is a ghost for background tensions smaller than a critical tension, while it is a healthy field otherwise. We give a geometrical interpretation of the existence of the critical tension and of the reason why the relevant field is a ghost or not depending on the background tension. We howeve...

Sbis, Fulvio

2014-01-01T23:59:59.000Z

360

The conservative cascade of kinetic energy in compressible turbulence  

E-Print Network [OSTI]

The physical nature of compressible turbulence is of fundamental importance in a variety of astrophysical settings. We present the first direct evidence that mean kinetic energy cascades conservatively beyond a transitional "conversion" scale-range despite not being an invariant of the compressible flow dynamics. We use high-resolution three-dimensional simulations of compressible hydrodynamic turbulence on $512^3$ and $1024^3$ grids. We probe regimes of forced steady-state isothermal flows and of unforced decaying ideal gas flows. The key quantity we measure is pressure dilatation cospectrum, $E^{PD}(k)$, where we provide the first numerical evidence that it decays at a rate faster than $k^{-1}$ as a function of wavenumber. This is sufficient to imply that mean pressure dilatation acts primarily at large-scales and that kinetic and internal energy budgets statistically decouple beyond a transitional scale-range. Our results suggest that an extension of Kolmogorov's inertial-range theory to compressible turbulence is possible.

Hussein Aluie; Shengtai Li; Hui Li

2011-07-28T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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

The Energy Cascade from Warm Dark Matter Decays  

E-Print Network [OSTI]

We use a set of Monte Carlo simulations to follow the cascade produced by a primary electron of energy E_in in the intergalactic medium. We choose E_in=3-10 keV as expected from the decay of one of the most popular Warm Dark Matter (WDM) candidates, sterile neutrinos. Our simulation takes into account processes previously neglected such as free-free interactions with ions and recombinations and uses the best available cross sections for collisional ionizations and excitations with H and He and for electron-electron collisions. We precisely derive the fraction of the primary electron energy that heats the gas, ionizes atoms and produces line and continuum photons as a function of the ionization fraction. Handy fitting formulae for all the above energy depositions are provided. By keeping track of the individual photons we can distinguish between photons in the Ly-alpha resonance and those with energy E gas. This separation is important because a Ly-alpha background can heat or cool the gas depending on the nature of the photons, and can have effects on the 21 cm radiation emitted by neutral H, which will probably become detectable at z > 6 in the near future by the next generation radio interferometers.

M. Valds; A. Ferrara

2008-03-04T23:59:59.000Z

362

The conservative cascade of kinetic energy in compressible turbulence  

E-Print Network [OSTI]

The physical nature of compressible turbulence is of fundamental importance in a variety of astrophysical settings. We present the first direct evidence that mean kinetic energy cascades conservatively beyond a transitional "conversion" scale-range despite not being an invariant of the compressible flow dynamics. We use high-resolution three-dimensional simulations of compressible hydrodynamic turbulence on $512^3$ and $1024^3$ grids. We probe regimes of forced steady-state isothermal flows and of unforced decaying ideal gas flows. The key quantity we measure is pressure dilatation cospectrum, $E^{PD}(k)$, where we provide the first numerical evidence that it decays at a rate faster than $k^{-1}$ as a function of wavenumber. This is sufficient to imply that mean pressure dilatation acts primarily at large-scales and that kinetic and internal energy budgets statistically decouple beyond a transitional scale-range. Our results suggest that an extension of Kolmogorov's inertial-range theory to compressible turbu...

Aluie, Hussein; Li, Hui

2011-01-01T23:59:59.000Z

363

Emission and Propagation Properties of Midinfrared Quantum Cascade Lasers  

SciTech Connect (OSTI)

We report divergence, astigmatism and M2 measurements of quantum cascade lasers (QCL) with an emission wavelength of 8.77?m. Emission profiles from the QCL facet showed divergence angles of 62 and 32 FWHM 2 for the fast and slow axes, respectively. The observation of far field structure superimposed on the fast axes profiles was attributed to the position of the QCL die with respect to the edge of the laser submount, emphasizing the need for careful placement. Two diffraction-limited Germanium aspheric microlenses were designed and fabricated to efficiently collect, collimate, and focus QCL emission. A confocal system comprised of these lenses was used to measure the beam propagation figure of merit (M2) yielding 1.8 and 1.2 for the fast and slow axes, respectively. Astigmatism at the exit facet was calculated to be about 4 ?m, or less than half a wave. To the best of our knowledge, this is the first experimental measurement of astigmatism and M2 reported for mid-IR QCLs.

Krishnaswami, Kannan; Bernacki, Bruce E.; Cannon, Bret D.; Ho, Nicolas; Anheier, Norman C.

2008-02-15T23:59:59.000Z

364

Recent developments of the cascade-exciton model of nuclear reactions  

SciTech Connect (OSTI)

Recent developments of the Cascade-Exciton Model (CEM) of nuclear reactions are described. The improved cascade-exciton model as implemented in the code CEM97 differs from the CEM95 version by incorporating new approximations for the elementary cross sections used in the cascade, using more precise values for nuclear masses and pairing energies, using corrected systematics for the level-density parameters, and several other refinements. We have improved algorithms used in many subroutines, decreasing the computing time by up to a factor of 6 for heavy targets. We describe a number of further improvements and changes to CEM97, motivated by new data on isotope production measured at GSI. This leads us to CEM2k, a new version of the CEM code. CEM2k has a longer cascade stage, less preequilibrium emission, and evaporation from more highly excited compound nuclei compared to earlier versions. CEM2k also has other improvements and allows us to better model neutron, radionuclide, and gas production in ATW spallation targets. The increased accuracy and predictive power of the code CEM2k are shown by several examples. Further necessary work is outlined. KEYWORDS: Intranuclear cascade, preequilibrium, evaporation, and fission reactions, Monte Carlo simulations, cascade-exciton model, particle spectra, spallation and fission cross sections, GSI data

Mashnik, S. G. (Stepan G.); Sierk, A. J. (Arnold J.)

2001-01-01T23:59:59.000Z

365

Salt tectonics, patterns of basin fill, and reservoir distribution  

SciTech Connect (OSTI)

Salt structures, which develop due to sediment loading, gravity creep, and/or buoyance, include boundary-fault grabens and half grabens, rollers, anticlines, domes and walls, diapirs, sills, massifs, and compressional toe structure. Associated features include fault systems and turtle structures. Of these, six directly relate to basin fill and all directly influence the distribution of reservoir facies. Salt structuring is initiated by sedimentation, which in turn is localized by salt withdrawal. Withdrawal produces individual salt structures, migrating sills, dissected massifs, and regional depocenters bordered by salt walls. Composite withdrawals dictate the patterns of basin fill. Relative rates of structural growth and sedimentation control the distribution of reservoir facies. When growth dominates, sands are channeled into lows. When sedimentation dominates and maintains flat surfaces, facies distribution is not impacted except where faulting develops. This paper presents techniques for using seismic data to determine the controls on salt structural growth and sedimentation and the patterns of basin fill and reservoir distribution.

Yorston, H.J.; Miles, A.E.

1988-01-01T23:59:59.000Z

366

A Comment on Tectonics and the Future of Life on Terrestrial Planets  

E-Print Network [OSTI]

It is argued that the tight interconnection between biological, climatological, and geophysical factors in the history of the terrestrial biosphere can teach us something of wider importance regarding the general astrobiological evolution of planets in the Galactic habitable zone of the Milky Way. Motivated by a recent debate on the future of Earth's biosphere, we suggest an additional reason why the impact of plate tectonics on the biological evolution is significant on the global Galactic level.

Milan M. Cirkovic

2003-09-29T23:59:59.000Z

367

Northern Basin and Range Geothermal Region | Open Energy Information  

Open Energy Info (EERE)

and Range Geothermal Region and Range Geothermal Region Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Northern Basin and Range Geothermal Region Details Areas (34) Power Plants (3) Projects (7) Techniques (33) Map: {{{Name}}} Examination of seismicity and late Quaternary faults in Montana and Idaho north of the Snake River Plain shows a geographic correspondence between high seismicity and 24 faults that have experienced surface rupture during the late Quaternary. The Lewis and Clark Zone delineates the northern boundary of this tectonically active extensional region. Earthquakes greater than magnitude 5.5 and all identified late Quaternary faults are confined to the Montana-Idaho portion of the Basin and Range Province south of the Lewis and Clark Zone. Furthermore, all 12 Holocene faults are

368

Scenarios constructed for the effects of tectonic processes on the potential nuclear waste repository at Yucca Mountain  

SciTech Connect (OSTI)

A comprehensive collection of scenarios is presented that connect initiating tectonic events with radionuclide releases by logical and physically possible combinations or sequences of features, events and processes. The initiating tectonic events include both discrete faulting and distributed rock deformation developed through the repository and adjacent to it, as well as earthquake-induced ground motion and changes in tectonic stress at the site. The effects of these tectonic events include impacts on the engineered-barrier system, such as container rupture and failure of repository tunnels. These effects also include a wide range of hydrologic effects such as changes in pathways and flow rates in the unsaturated and saturated zones, changes in the water-table configuration, and in the development of perched-water systems. These scenarios are intended go guide performance-assessment analyses and to assist principal investigators in how essential field, laboratory, and calculational studies are used. This suite of scenarios will help ensure that all important aspects of the system disturbance related to a tectonic scenario are captured in numerical analyses. It also provides a record of all options considered by project analysts to provide documentation required for licensing agreement. The final portion of this report discusses issues remaining to be addressed with respect to tectonic activity. 105 refs.

Barr, G.E.; Borns, D.J. [Sandia National Labs., Albuquerque, NM (United States); Fridrich, C. [Geological Survey, Lakewood, CO (United States)

1996-10-01T23:59:59.000Z

369

Astrophysical Gyrokinetics: Kinetic and Fluid Turbulent Cascades In Magentized Weakly Collisional Plasmas  

SciTech Connect (OSTI)

This paper presents a theoretical framework for understanding plasma turbulence in astrophysical plasmas. It is motivated by observations of electromagnetic and density fluctuations in the solar wind, interstellar medium and galaxy clusters, as well as by models of particle heating in accretion disks. All of these plasmas and many others have turbulentmotions at weakly collisional and collisionless scales. The paper focuses on turbulence in a strong mean magnetic field. The key assumptions are that the turbulent fluctuations are small compared to the mean field, spatially anisotropic with respect to it and that their frequency is low compared to the ion cyclotron frequency. The turbulence is assumed to be forced at some system-specific outer scale. The energy injected at this scale has to be dissipated into heat, which ultimately cannot be accomplished without collisions. A kinetic cascade develops that brings the energy to collisional scales both in space and velocity. The nature of the kinetic cascade in various scale ranges depends on the physics of plasma fluctuations that exist there. There are four special scales that separate physically distinct regimes: the electron and ion gyroscales, the mean free path and the electron diffusion scale. In each of the scale ranges separated by these scales, the fully kinetic problem is systematically reduced to a more physically transparent and computationally tractable system of equations, which are derived in a rigorous way. In the "inertial range" above the ion gyroscale, the kinetic cascade separates into two parts: a cascade of Alfvenic fluctuations and a passive cascade of density and magnetic-fieldstrength fluctuations. The former are governed by the Reduced Magnetohydrodynamic (RMHD) equations at both the collisional and collisionless scales; the latter obey a linear kinetic equation along the (moving) field lines associated with the Alfvenic component (in the collisional limit, these compressive fluctuations become the slow and entropy modes of the conventional MHD). In the "dissipation range" below ion gyroscale, there are again two cascades: the kinetic-Alfven-wave (KAW) cascade governed by two fluid-like Electron Reduced Magnetohydrodynamic (ERMHD) equations and a passive cascade of ion entropy fluctuations both in space and velocity. The latter cascade brings the energy of the inertial-range fluctuations that was Landau-damped at the ion gyroscale to collisional scales in the phase space and leads to ion heating. The KAWenergy is similarly damped at the electron gyroscale and converted into electron heat. Kolmogorov-style scaling relations are derived for all of these cascades. The relationship between the theoretical models proposed in this paper and astrophysical applications and observations is discussed in detail.

A.A. Schekochihin, S.C. Cowley, W. Dorland, G.W. Hammett, G.G. Howes, E. Quataert, and T. Tatsuno

2009-04-23T23:59:59.000Z

370

Mass transfer between eastern Tien Shan and adjacent basins (central Asia): constraints on regional tectonics and topography  

Science Journals Connector (OSTI)

......southern Tibet: field observations and...Himalayan sediment production 8 Myr ago despite...relationship with oil and gas distribution...known: (1) the cumulative thickness of these...southern Tibet: field observations and...Himalayan sediment production 8 Myr ago despite...relationship with oil and gas distribution......

Franois Mtivier; Yves Gaudemer

1997-01-01T23:59:59.000Z

371

Salt tectonics, patterns of basin fill, and reservoir distribution  

SciTech Connect (OSTI)

Salt structures, which develop due to sediment loading, gravity creep, and/or buoyancy, include boundary-fault grabens and half grabens, rollers, anticlines, domes and walls, diapirs, sills, massifs, and compressional toe structures. Associated features include fault systems and turtle structures. Of these, six directly relate to basin fill and all directly influence the distribution of reservoir facies. Salt structuring is initiated by sedimentation, which in turn is localized by salt withdrawal. Withdrawal produces individual salt structures, migrating sills, dissected massifs, and regional depocenters bordered by salt walls. Composite withdrawals dictate the patterns of basin fill. Relative rates of structural growth and sedimentation control the distribution of reservoir facies. When growth dominates, sands are channeled into lows. When sedimentation dominates and maintains flat surfaces, facies distribution is not impacted except where faulting develops. Turtle structures, developed by the inversion of peripheral synclines, can move sands into favorable structural position and/or serve as platforms for carbonate reservoir development. Salt growth varies with type structure, stage of development, and rate of sedimentation. Sedimentation at a specific location depends on basin position, sediment transport system, sea level stand, and rate of salt withdrawal. This paper presents techniques for using seismic data to determine the controls on salt structural growth and sedimentation and the patterns of basin fill and reservoir distribution.

Yorston, H.J.; Miles, A.E.

1988-02-01T23:59:59.000Z

372

The critical tension in the Cascading DGP model  

E-Print Network [OSTI]

We study the behaviour of weak gravitational fields in the 6D Cascading DGP model using a bulk-based approach. To deal with the ambiguity in the thin limit of branes of codimension higher than one, we consider a specific regularization of the internal structure of the branes where the 5D brane can be considered thin with respect to the 4D one. We consider the solutions corresponding to pure tension sources on the 4D brane, and study perturbations at first order around these background solutions. We adopt a 4D scalar-vector-tensor decomposition, and focus on the scalar sector of perturbations. We show that, in a suitable 4D limit, the trace part of the 4D metric perturbations obeys a decoupled equation which suggests that it is a ghost for background tensions smaller than a critical tension, while it is a healthy field otherwise. We give a geometrical interpretation of the existence of the critical tension and of the reason why the relevant field is a ghost or not depending on the background tension. We however find a value of the critical tension which is different from the one already found in the literature. Differently from the results in the literature, our analysis implies that, choosing the background tension suitably, we can construct ghost-free models for any value of the free parameters of the theory. We suggest that the difference lies in the procedure used to evaluate the pillbox integration across the codimension-2 brane. We confirm the validity of our analysis by performing numerically the integration in a particular case where the solution inside the thick cod-2 brane is known exactly. We stress that the singular structure of the perturbation fields in the nested branes set-ups is very subtle, and that great care has to be taken when deriving the codimension-2 junction conditions.

Fulvio Sbisa'; Kazuya Koyama

2014-09-01T23:59:59.000Z

373

Soliton compression to few-cycle pulses with a high quality factor by engineering cascaded quadratic nonlinearities  

Science Journals Connector (OSTI)

We propose an efficient approach to improve few-cycle soliton compression with cascaded quadratic nonlinearities by using an engineered multi-section structure of the nonlinear...

Zeng, Xianglong; Guo, Hairun; Zhou, Binbin; Bache, Morten

2012-01-01T23:59:59.000Z

374

Improving Soliton Compression Quality with Cascaded Nonlinearities by Engineered Multi-section Quasi-phase-matching Design  

Science Journals Connector (OSTI)

In few-cycle soliton generation with large compression factors using cascaded nonlinearities the pulse quality can be improved by engineering quasi-phase-matching structures. The...

Zeng, Xianglong; Guo, Hairun; Zhou, Binbin; Bache, Morten

375

Isotopic Ratio Measurements of Atmospheric Carbon Dioxide Using a 4.3 ?m Pulsed Quantum Cascade Laser  

Science Journals Connector (OSTI)

We report CO2 isotopic ratios (13C, 18O) measured in air using a pulsed quantum cascade laser at 2310 cm-1. Performance is...

Nelson, David; McManus, John B; Zahniser, Mark S; Tuzson, Bela; Emmenegger, Lukas

376

Time-Resolved Measurements of Near-Infrared Pulse Induced Ultrafast Optical Modulation of Quantum Cascade Lasers  

Science Journals Connector (OSTI)

We temporally resolve ultrafast modulation of quantum cascade lasers (QCLs) using a near-infrared pump mid-infrared probe technique. We compare interband and intersubband transition...

Cai, Hong; Liu, Sheng; Lalanne, Elaine; Guo, Dingkai; Chen, Xing; Wang, Xiaojun; Choa, Fow-Sen; Johnson, Anthony M

377

CAPITAL REGION  

Broader source: Energy.gov (indexed) [DOE]

t 09/20/07 15:28 FAX 301 903 4656 t 09/20/07 15:28 FAX 301 903 4656 CAPITAL REGION 0 j002 SDOE F 1325.8 (8-89) EFG (0790) Energy United States Government Department of Energy Memorandum DATE. September 18, 2007 Audit Report No.: OAS-L-07-23 REPLY TO: IG-34 (A07TG036) SUBJECT: Evaluation of "The Federal Energy Regulatory Commission's Cyber Security Program-2007" TO: Chairman, Federal Energy Regulatory Commission The purpose of this report is to inform you of the results o Four evaluation of the Federal Energy Regulatory Commission's (Commission) cyber security program. The evaluation was initiated in May 2007, and our fieldwork was conducted through September 2007. Our methodology is described in the attachment to this report. . INTRODUCTION AND OBJECTIVE The Commission reports that it is constantly improving thl stability, reliability, and

378

A Novel Integrated TPV Power Generation System Based on a Cascaded Radiant Burner  

Science Journals Connector (OSTI)

A cascaded radiant burner has been developed and based on this burner a novel integrated TPV system has been built. In this system low bandgap GaSb cells and silicon concentrator solar cells are employed integratedly. The unique cascaded radiant burner consists of two different radiators which cascade?emit two streams of radiation with different spectra. The two different radiators are arranged in tandem with their surface temperatures being different as well. Two streams of radiation output are matched respectively to the bandgaps of silicon cells and GaSb cells. Thus one stream of radiation output illuminates silicon concentrator solar cells while the other drives low bandgap GaSb cells in the integrated system. In this work the combustion performance of the cascaded radiant burner was investigated at varying degrees of exhaust heat recuperation. The electrical output characteristics of both silicon concentrator solar cells and GaSb cells in the gas combustion?driven TPV system were measured under various operating conditions. It is shown that this innovative design considerably increases the TPV system efficiency due to the cascaded utilization of heat released during natural gas combustion and the optimized thermal management.

K. Qiu; A. C. S. Hayden

2004-01-01T23:59:59.000Z

379

Tectonic process analysis in Zagros Mountain with the aid of drainage networks and topography maps dated 19502001 in GIS  

Science Journals Connector (OSTI)

In this study, a digital elevation model was used for hydrological study/watershed management, topography, geology, tectonic geomorphology, and morphometric analysis. Geographical information system provides a...

Saied Pirasteh; Biswajeet Pradhan; Syed M. Rizvi

2011-02-01T23:59:59.000Z

380

Snake River Plain Geothermal Region | Open Energy Information  

Open Energy Info (EERE)

Snake River Plain Geothermal Region Snake River Plain Geothermal Region (Redirected from Snake River Plain) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Snake River Plain Geothermal Region Details Areas (8) Power Plants (1) Projects (2) Techniques (11) Map: {{{Name}}} "The Snake River Plain is a large arcuate structural trough that characterizes the topography of southern Idaho that can be divided into three sections: western, central, and eastern. The western Snake River Plain is a large tectonic graben or rift valley filled with several km of lacustrine (lake) sediments; the sediments are underlain by rhyolite and basalt, and overlain by basalt. The western plain began to form around 11-12 Ma with the eruption of rhyolite lavas and ignimbrites. The western plain is not parallel to North American Plate motion, and lies at a high

Note: This page contains sample records for the topic "region cascades tectonic" 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

Snake River Plain Geothermal Region | Open Energy Information  

Open Energy Info (EERE)

Region Region Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Snake River Plain Geothermal Region Details Areas (8) Power Plants (1) Projects (2) Techniques (11) Map: {{{Name}}} "The Snake River Plain is a large arcuate structural trough that characterizes the topography of southern Idaho that can be divided into three sections: western, central, and eastern. The western Snake River Plain is a large tectonic graben or rift valley filled with several km of lacustrine (lake) sediments; the sediments are underlain by rhyolite and basalt, and overlain by basalt. The western plain began to form around 11-12 Ma with the eruption of rhyolite lavas and ignimbrites. The western plain is not parallel to North American Plate motion, and lies at a high angle to the central and eastern Snake River Plains. Its morphology is

382

First search for extraterrestrial neutrino-induced cascades with IceCube  

SciTech Connect (OSTI)

We report on the first search for extraterrestrial neutrino-induced cascades in IceCube.The analyzed data were collected in the year 2007 when 22 detector strings were installed and operated. We will discuss the analysis methods used to reconstruct cascades and to suppress backgrounds. Simulated neutrino signal events with a E-2 energy spectrum, which pass the background rejection criteria, are reconstructed with a resolution Delta(log E) ~;; 0.27 in the energy range from ~;; 20 TeV to a few PeV. We present the range of the diffuse flux of extra-terrestrial neutrinos in the cascade channel in IceCube within which we expect to be able to put a limit.

IceCube Collaboration; Kiryluk, Joanna

2009-05-22T23:59:59.000Z

383

Soliton compression to high-quality few-cycle pulses by engineering cascaded quadratic nonlinearities  

E-Print Network [OSTI]

We propose an efficient approach to improve few-cycle soliton compression with cascaded quadratic nonlinearities by using an engineered multi-section structure of the nonlinear crystal. By exploiting engineering of the cascaded quadratic nonlinearities, in each section soliton compression with a low effective order is realized, and high-quality few-cycle pulses with large compression factors are feasible. Each subsequent section is designed so that the compressed pulse exiting the previous section experiences an overall effective self-defocusing cubic nonlinearity corresponding to a modest soliton order, which is kept larger than unity to ensure further compression. This is done by increasing the cascaded quadratic nonlinearity in the new section with an engineered reduced residual phase mismatch. The low soliton orders in each section ensure excellent pulse quality and high efficiency. Numerical results show that compressed pulses with less than three-cycle duration can be achieved even when the compression ...

Zeng, Xianglong; Zhou, Binbin; Bache, Morten

2012-01-01T23:59:59.000Z

384

Cascaded H-bridge inverter motor drives for hybrid electric vehicle applications  

Science Journals Connector (OSTI)

This paper presents the asymmetric cascaded H-bridge multilevel inverter for electric vehicles (EV) and hybrid electric vehicles (HEV) applications. Currently available power inverter systems for HEVs use a DC-DC boost converter to boost the battery voltage for a traditional three-phase inverter. The present HEV drive inverters have low power density, are expensive, and have low efficiency because they need a bulky inductor. Asymmetric cascaded H-bridge multilevel inverter design for EV and HEV applications without the use of inductors to output a boosted AC voltage is proposed in this paper. Traditionally, each H-bridge needs a DC power supply having equal values of DC power sources. The proposed design uses the asymmetric cascaded multilevel inverter using non-equal DC power sources based on specified ratios. A fundamental switching scheme is used to do modulation control and to produce a seven-level phase voltage.

P. Renuga; T. Prathiba

2012-01-01T23:59:59.000Z

385

An experimental and computational study of transonic three-dimensional flow in a turbine cascade  

SciTech Connect (OSTI)

Detailed experimental measurements of the flow in a cascade of turbine rotor blades with a nonplanar end wall are reported. The cascade geometry was chosen to model as closely as possible that of a H.P. gas turbine rotor blade. The blade section is designed for supersonic flow with an exit Mach number of 1.15 and the experiments covered a range of exit Mach numbers from 0.7-1.2. Significant three-dimensional effects were observed and the origin of these is discussed. The measurements are compared with data for the same blade section in a two-dimensional cascade and also with the predictions of two different fully three-dimensional inviscid flow calculation methods. It is found that both these calculations predict the major threedimensional effects on the flow correctly.

Camus, J.J.; Denton, J.D.; Scrivener, C.T.J.; Soulis, J.V.

1984-04-01T23:59:59.000Z

386

Excitonic enhancement of nonradiative energy transfer to bulk silicon with the hybridization of cascaded quantum dots  

SciTech Connect (OSTI)

We report enhanced sensitization of silicon through nonradiative energy transfer (NRET) of the excitons in an energy-gradient structure composed of a cascaded bilayer of green- and red-emitting CdTe quantum dots (QDs) on bulk silicon. Here NRET dynamics were systematically investigated comparatively for the cascaded energy-gradient and mono-dispersed QD structures at room temperature. We show experimentally that NRET from the QD layer into silicon is enhanced by 40% in the case of an energy-gradient cascaded structure as compared to the mono-dispersed structures, which is in agreement with the theoretical analysis based on the excited state population-depopulation dynamics of the QDs.

Yeltik, Aydan; Guzelturk, Burak; Akhavan, Shahab [Department of Physics and Department of Electrical and Electronics Engineering, UNAMInstitute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800 (Turkey)] [Department of Physics and Department of Electrical and Electronics Engineering, UNAMInstitute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800 (Turkey); Ludwig Hernandez-Martinez, Pedro; Volkan Demir, Hilmi, E-mail: volkan@stanfordalumni.org [Department of Physics and Department of Electrical and Electronics Engineering, UNAMInstitute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800 (Turkey); Luminous Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering and School of Physical and Mathematical Sciences, Nanyang Technological University, Nanyang Avenue, Singapore 639798 (Singapore)

2013-12-23T23:59:59.000Z

387

SIMULATION MODELING OF AN ENHANCED LOW-EMISSION SWIRL-CASCADE BURNER  

SciTech Connect (OSTI)

The research team was formed. The advanced CFDRC-CHEMKIN software package was installed on a SUN-SPARC dual processor workstation. The literature pertinent to the project was collected. The physical model was set and all parameters and variables were identified. Based on the physical model, the geometric modeling and grid generation processes were performed using the CFD-GEOM (Interactive Geometric Modeling and Grid Generation software). A total number of 11160 cells (248 x 45) were generated to numerically model the baseline, cascaded, swirling, and swirling-cascaded flames. With the cascade being added to the jet, the geometric complexity of the problem increased; which required multi-domain structured grid systems to be connected and matched on the boundaries.

Ala Qubbaj

2003-04-01T23:59:59.000Z

388

ARRA: Reconfiguring Power Systems to Minimize Cascading Failures - Models and Algorithms  

SciTech Connect (OSTI)

Building on models of electrical power systems, and on powerful mathematical techniques including optimization, model predictive control, and simluation, this project investigated important issues related to the stable operation of power grids. A topic of particular focus was cascading failures of the power grid: simulation, quantification, mitigation, and control. We also analyzed the vulnerability of networks to component failures, and the design of networks that are responsive to and robust to such failures. Numerous other related topics were investigated, including energy hubs and cascading stall of induction machines

Dobson, Ian [Iowa State University] [Iowa State University; Hiskens, Ian [Unversity of Michigan] [Unversity of Michigan; Linderoth, Jeffrey [University of Wisconsin-Madison] [University of Wisconsin-Madison; Wright, Stephen [University of Wisconsin-Madison] [University of Wisconsin-Madison

2013-12-16T23:59:59.000Z

389

Gamma-strength functions in 60Ni from two-step cascades following proton capture  

E-Print Network [OSTI]

The two-step cascade method previously used in neutron capture experiments is now applied to a proton capture reaction. The spectrum of two-step cascades populating the first 2+ level of 60Ni has been measured with 59Co(p,2gamma)60Ni reaction. The simulation technique used for the spectrum analysis allows one to reveal the range of possible shapes of both E1 and M1 gamma-strength functions. The low-energy enhancement previously observed in 3He induced reactions is seen to appear in M1 strength functions of 60Ni.

A. Voinov; S. M. Grimes; C. R. Brune; M. Guttormsen; A. C. Larsen; T. N. Massey; A. Schiller; S. Siem

2009-11-10T23:59:59.000Z

390

16 - Microcavities and quantum cascade laser structures based on silicongermanium (SiGe) nanostructures  

Science Journals Connector (OSTI)

Abstract: This chapter discusses two types of Si-based light-emitting devices based on Ge quantum dots in optical microcavities and SiGe quantum cascade (QC) structures. After reviewing various solutions for Si-based light-emitting devices, the chapter describes the method to enhance light emission from Ge dots through embedding them into optical microcavities. It then reviews SiGe quantum cascade laser (QCL) structures on issues of material growth, electroluminescence from SiGe QC structures, n-type SiGe QC structures, and waveguides for SiGe QCLs.

J. Xia; Y. Shiraki; J. Yu

2011-01-01T23:59:59.000Z

391

Four-photon cascade from quadexcitons in a single GaAs quantum dot  

Science Journals Connector (OSTI)

We demonstrate the generation of temporally correlated four photons emitted by the cascade recombination of a quadexciton in a self-assembled GaAs quantum dot (QD) by performing single photon correlation measurements. The cascade decay of the quadexciton involves a triexciton, a biexciton, and an exciton. The emissions of these states are identified in the photoluminescence (PL) spectrum of the QD by cross-correlation measurements. Polarization-resolved cross-correlation measurements show that the polarizations of the four photons are partly correlated. Radiative, nonradiative, and polarization flipping rates in the QD are estimated from the bunching visibilities of the cross-correlation measurements and the PL lifetimes.

Y. Arashida; Y. Ogawa; F. Minami

2011-09-12T23:59:59.000Z

392

hal-00135292,version1-7Mar2007 Photovoltaic Probe of Cavity Polaritons in a Quantum Cascade Structure  

E-Print Network [OSTI]

hal-00135292,version1-7Mar2007 Photovoltaic Probe of Cavity Polaritons in a Quantum Cascade and a photonic mode of a planar microcavity has been detected by angle-resolved photovoltaic measure- ments polaritons in angle-resolved photovoltaic measurements, performed on a quan- tum cascade (QC) structure

Boyer, Edmond

393

Does removal of an alien predator from small islands in the Baltic Sea induce a trophic cascade?  

E-Print Network [OSTI]

Does removal of an alien predator from small islands in the Baltic Sea induce a trophic cascade known as a trophic cascade. Because alien predators can have a disproportionate impact, compared communities than native predators. We studied the indirect effects of the removal of an alien predator

Oksanen, Lauri

394

Abstract-The ability of cascaded H-bridge multilevel inverter drives (MLID) to operate under faulty condition including AI-  

E-Print Network [OSTI]

for electric drive application have been discussed in [1]. The cascaded MLID is a general fit for large automotive all-electric drives because of the high VA rating possible and because it uses several dc voltage-phase cascaded multilevel inverter drive for an electric vehicle is illustrated in Fig. 1. The series of H

Tolbert, Leon M.

395

1058 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 49, NO. 5, OCTOBER 2002 Charge Balance Control Schemes for Cascade  

E-Print Network [OSTI]

electric vehicle (HEV) motor drives. Multilevel converters: 1) can gen- erate near-sinusoidal voltages system. The cascade inverter is a natural fit for large automotive hybrid electric drives because it uses--Cascade inverter, hybrid electric vehicle, motor drive, multilevel converter, multilevel inverter. I. INTRODUCTION

Tolbert, Leon M.

396

Masting and trophic cascades: interplay between rowan trees, apple fruit moth, and their parasitoid in southern Norway  

E-Print Network [OSTI]

Masting and trophic cascades: interplay between rowan trees, apple fruit moth, and their parasitoid. 2004. Masting and trophic cascades: interplay between rowan trees, apple fruit moth of the dominant seed predator and its parasitoid. The apple fruit moth, Argyresthia conjugella Zeller, is a pre

397

Performance analysis of the cascade impactor, the federal reference method PM 2.5 sampler, and the improve PM 2.5 sampler  

E-Print Network [OSTI]

documented problems with the cascade impactor and suspicions over its accuracy. In this thesis research, the collected PM fractions from the cascade impactor will be subjected to analysis by the Coulter Counter Multisizer to verify inaccuracies. The new FRM...

Buch, Usha-Maria

2012-06-07T23:59:59.000Z

398

A calculation of the number of muons at sea-level in a photon-electron cascade initiated by a primary photon of energy 1014eV  

Science Journals Connector (OSTI)

The muon component in a photon-electron cascade initiated...14...eV has been estimated for sea-level in the longitudinal development of the electromagnetic cascade. Two distinct possible processes of muon product...

N. Mishra

1966-01-11T23:59:59.000Z

399

Software tectonics  

E-Print Network [OSTI]

The resent shift of attention in the architectural discourse towards issues of ecological design, coupled with the undeniable role of computation, has already cast a new operative role to the notion of environment. Instead ...

Tsamis, Alexandros, 1976-

2012-01-01T23:59:59.000Z

400

Region 9: Pacific Rim Region, Regional Sustainability Plan  

Broader source: Energy.gov (indexed) [DOE]

REGION 9: PACIFIC RIM REGION REGION 9: PACIFIC RIM REGION Regional Sustainability Plan Presented by Ruth Cox Region 9 Regional Administrator Federal Utility Partnership Working Group (FUPWG) May 22 nd , 2013 REGION 9 INFORMATION MANAGE Federal space  36 million RSF in Region Nine * 173 owned buildings, 955 leased buildings * 100,000 Federal workers housed DESIGN & CONSTRUCT new Federal buildings $1.4 billion in FY12 capital construction projects $318 million in FY13 - Los Angeles Courthouse project PROVIDE PROCUREMENT LEADERSHIP across the Federal government  $1.24 billion in total GSA Schedule sales in FY12  $468 million to small businesses  34,000 fleet vehicles, 53% of which are Alternative Fuel Vehicles Pacific Rim Profile - CA, AZ, NV, HI

Note: This page contains sample records for the topic "region cascades tectonic" 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.


401

Optimization of control of long-term operating conditions of hydroelectric stations with special reference to the Angara-Enisei cascade of hydroelectric stations  

Science Journals Connector (OSTI)

1. To increase the effectiveness of using water and energy resources by cascades of reservoirs, it is necessary ...

A. Yu. Aleksandrovskii; G. F. Chernenko; N. K. Litvin

1989-08-01T23:59:59.000Z

402

The Role of Damage Cascade in the Nanocrystallization of Metallic Glass  

E-Print Network [OSTI]

was performed, enabling a link between the damage cascade event to the subsequent heat transfer. Modeling results indicate that for 1 MeV Ni ion irradiation in Ni52.5Nb10Zr15Ti15Pt7.5, the heat transfer rate is too large for direct crystallization. Although...

Myers, Michael T.

2011-08-08T23:59:59.000Z

403

Rescuing ecosystems from extinction cascades through compensatory perturbations Sagar Sahasrabudhe & Adilson E. Motter  

E-Print Network [OSTI]

corresponds to the sole zero-population species at a stable target state (in addition to the primary removal state in addition to the one introduced by the primary removal. This forced removal drives the system. The statistics are for all cascades mitigated by a species removal in Fig. 2b of the paper. The rescue states

Shahriar, Selim

404

Global Optimization Methods for the Aerodynamic Shape Design of Transonic Cascades  

E-Print Network [OSTI]

Global Optimization Methods for the Aerodynamic Shape Design of Transonic Cascades T. Mengistu algorithms, namely Genetic Algorithm (GA) and Simulated Annealing (SA), have been applied to the aerodynamic reduction in total pressure loss by eliminating the passage shock. 1. INTRODUCTION Aerodynamic optimization

Neumaier, Arnold

405

To appear in The Electricity Journal, Dec. 2003 Cascading Failures: Survival vs. Prevention  

E-Print Network [OSTI]

1 To appear in The Electricity Journal, Dec. 2003 Cascading Failures: Survival vs. Prevention systems, more data collection, more data processing, load management, and more programs to promote, though the really big ones are not quite as infrequent as one might first expect. The North American

406

Analytic target cascading in simulation-based building design R. Choudharya,*, A. Malkawib  

E-Print Network [OSTI]

of an office building by posing the problem as a constrained non- linear optimization problem. Gero et al. [9] included energy efficiency in the context of other performance criteria and proposed a design optimizationAnalytic target cascading in simulation-based building design R. Choudharya,*, A. Malkawib , P

Papalambros, Panos

407

Assessing Water Deprivation at the Sub-river Basin Scale in LCA Integrating Downstream Cascade Effects  

Science Journals Connector (OSTI)

Assessing Water Deprivation at the Sub-river Basin Scale in LCA Integrating Downstream Cascade Effects ... Although these indicators represent a great step forward in the assessment of water-use-related impacts in LCA, significant challenges still remain in improving their accuracy and relevance. ...

Philippe Loubet; Philippe Roux; Montserrat Nez; Gilles Belaud; Vronique Bellon-Maurel

2013-11-20T23:59:59.000Z

408

Spectral analysis for cascade-emission-based quantum communication in atomic ensembles  

E-Print Network [OSTI]

The ladder configuration of atomic levels provides a source for telecom photons (signal) from the upper atomic transition. \\ For rubidium and cesium atoms, the signal field has the range around 1.3-1.5 $\\mu$m that can be coupled to an optical fiber and transmitted to a remote location. \\ Cascade emission may result in pairs of photons, the signal entangled with the subsequently emitted infrared photon (idler) from the lower atomic transition.\\ This correlated two-photon source is potentially useful in the (Duan-Lukin-Cirac-Zoller) DLCZ protocol for the quantum repeater.\\ We implement the cascade emission to construct a modified DLCZ quantum repeater and investigate the role of time-frequency entanglement in the protocol.\\ The dependence of protocol on photon-number resolving and non-resolving detectors is also studied.\\ We find that frequency entanglement deteriorates the performance but the harmful effect can be diminished by using shorter pump pulses to generate the cascade emission.\\ An optimal cascade-emission-based DLCZ scheme is realized by applying a pure two-photon source in addition to using detectors of perfect quantum efficiency.

H. H. Jen

2014-03-11T23:59:59.000Z

409

Wave Turbulence in Superfluid 4 Energy Cascades, Rogue Waves & Kinetic Phenomena  

E-Print Network [OSTI]

Outline Wave Turbulence in Superfluid 4 He: Energy Cascades, Rogue Waves & Kinetic Phenomena Conference, Chernogolovka, 3 August 2009 McClintock Efimov Ganshin Kolmakov Mezhov-Deglin Wave Turbulence in Superfluid 4 He #12;Outline Outline 1 Introduction Motivation 2 Modelling wave turbulence Need for models

Fominov, Yakov

410

A Novel Cross-Flow Cascade Packed Column Design and Simulation  

Science Journals Connector (OSTI)

A Novel Cross-Flow Cascade Packed Column Design and Simulation ... Thus the abundant area for gas flow will decrease gas-phase pressure drop, and it can allow operation at gas velocities above the flooding points of countercurrent packed columns. ...

Fengrong Chen; Rongqi Zhou; Zhanting Duan; Yumei Liu

1999-07-03T23:59:59.000Z

411

INVESTIGATION OF PERIODIC BOUNDARY CONDITIONS IN MULTIPASSAGE CASCADE FLOWS USING OVERSET GRIDS  

E-Print Network [OSTI]

. Computational results are presented for two and four passage, subsonic and tran­ sonic flows through a turbine and a compressor cascade. The overset grid solutions over the multi­passage periodic domains agree well in Refers to inflow exit Refers to outflow a Acoustic speed A Max. amplitude of the plunging motion c Blade

Tuncer, Ismail H.

412

Molecular Dynamics Simulation of Cascade-Induced Ballistic Helium Resolutioning from Bubbles in Iron  

SciTech Connect (OSTI)

Molecular dynamics simulations have been used to assess the ability of atomic displacement cascades to eject helium from small bubbles in iron. This study of the ballistic resolutioning mechanism employed a recently-developed Fe-He interatomic potential in concert with an iron potential developed by Ackland and co-workers. The primary variables examined were: irradiation temperature (100 and 600K), cascade energy (5 and 20 keV), bubble radius (0.5 and 1.0 nm), and He-to-vacancy ratio in the bubble (0.25, 0.5 and 1.0). Systematic trends were observed for each of these variables. For example, ballistic resolutioning leads to a greater number of helium atoms being displaced from larger bubbles and from bubbles that have a higher He/vacancy ratio (bubble pressure). He resolutioning was reduced at 600K relative to 100K, and for 20 keV cascades relative to 5 keV cascades. Overall, the results indicate a modest level of He removal by ballistic resolutioning. The results can be used to provide guidance in selection of a resolution parameter that can be employed in cluster dynamics models to predict the bubble size distribution that evolves under irradiation.

Stoller, Roger E [ORNL] [ORNL

2013-01-01T23:59:59.000Z

413

Abstract-A hybrid cascaded multilevel inverter application for renewable energy resources including a reconfiguration  

E-Print Network [OSTI]

be achieved by using the microgrid concept as discussed in [2]. Data center or telecommunication buildings an alternative topology of hybrid cascaded multilevel inverter applied to a low voltage dc microgrid, micro-turbine, wind turbine and fuel cell put forward many promising applications with high efficiency

Tolbert, Leon M.

414

A Hybrid Energy System Using Cascaded H-bridge Converter , Zhong Du2  

E-Print Network [OSTI]

schemes were developed to extract maximum wind power and charge/discharge the battery with fast dynamics proposes a hybrid energy system to integrate the variable-speed wind turbine, fuel cell, and battery using a cascaded H-bridge converter. One of the advantages of this topology is that it still can obtain

Tolbert, Leon M.

415

Method of making cascaded die mountings with springs-loaded contact-bond options  

DOE Patents [OSTI]

A cascaded die mounting device and method using spring contacts for die attachment, with or without metallic bonds between the contacts and the dies, is disclosed. One embodiment is for the direct refrigerant cooling of an inverter/converter carrying higher power levels than most of the low power circuits previously taught, and does not require using a heat sink.

Hsu, John S. (Oak Ridge, TN); Adams, Donald J. (Knoxville, TN); Su, Gui-Jia (Knoxville, TN); Marlino, Laura D. (Oak Ridge, TN); Ayers, Curtis W. (Kingston, TN); Coomer, Chester (Knoxville, TN)

2007-06-19T23:59:59.000Z

416

Quantum Cascade Lasers Tuned by Amorphous As2S3 Claddings Daniel L. Recht1  

E-Print Network [OSTI]

(roughly 5-20 µm) makes them a natural choice for trace gas sensing. The spectroscopic fingerprints of many). The output range of QCLs provides a natural solution to this problem. Trace gas sensing has thus beenQuantum Cascade Lasers Tuned by Amorphous As2S3 Claddings Daniel L. Recht1 , Zhijun Liu1

Arnold, Craig B.

417

Cascading uncertainty in climate change models and its implications for policy  

E-Print Network [OSTI]

Commentary Cascading uncertainty in climate change models and its implications for policy MARK, there are intrinsic problems with modelling natural systems (Cartwright 1983). This is because it is impossible). The original IPCC reports used simplistic assumption of greenhouse gas emissions over the next 100 years. From

Jones, Peter JS

418

Evolving Cascades of Voting Feature Detectors for Vehicle Detection in Satellite Imagery  

E-Print Network [OSTI]

Evolving Cascades of Voting Feature Detectors for Vehicle Detection in Satellite Imagery Krzysztof method for detection of vehicles in satellite imagery which involves a large number of simple elementary features and multiple detectors trained by genetic programming. The complete detection system is com- posed

Fernandez, Thomas

419

Linking Marketing and Engineering Product Design Decisions via Analytical Target Cascading  

E-Print Network [OSTI]

Linking Marketing and Engineering Product Design Decisions via Analytical Target Cascading? Jeremy to consumers and are feasible to produce. The resulting marketing and engineering design goals are driven decisions when the two problems are interrelated. A meth- od new to the marketing community, analytical

Papalambros, Panos

420

Terahertz Time Domain Spectroscopy of Phonon-Depopulation Based Quantum Cascade Lasers  

SciTech Connect (OSTI)

A 3.1 THz phonon depopulation-based quantum-cascade-laser is investigated using terahertz time domain spectroscopy. A gain of 25 cm{sup -1} and absorption features due to the lower laser level being populated from a parasitic electronic channel are highlighted.

Rungsawang, R.; Dhillon, S. S.; Jukam, N.; Oustinov, D.; Madeo, J.; Tignon, J. [Laboratoire Pierre Aigrain, Ecole Normale Superieure, UMR8551 CNRS, UPMC Univ. Paris 6, F-75005 Paris (France); Colombelli, R. [Institut d'Electronique Fondamentale, Universite Paris Sud, UMR8622 CNRS, 91405 Orsay (France); Dean, P.; Salih, M.; Khanna, S. P.; Linfield, E.; Davies, A. G. [School of Electronic and Electrical Engineering, University of Leeds, Leeds, LS2 9JT (United Kingdom)

2011-12-23T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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.


421

A tunable single-mode double-ring quantum-cascade laser  

Science Journals Connector (OSTI)

The design, fabrication and characterization of a monolithic double-ring quantum- cascade laser (DRQCL) are described. At a wavelength of 4.6m, we demonstrate tunable, single-mode operation of a DRQCL and use it as a source for spectroscopy of CO gas.

D Dhirhe; T J Slight; C C Nshii; C N Ironside

2012-01-01T23:59:59.000Z

422

Sensitive detection of methane and nitrous oxide isotopomers using a continuous wave quantum cascade laser  

Science Journals Connector (OSTI)

A continuous wave quantum cascade laser (QCL), operating near 8.1 ?m...4) and nitrous oxide (N2O) stable isotopes. Several rotational transitions of 14N2 16O, 15N14N16O, 14N2 18O,

G. Gagliardi; F. Tamassia; P. De Natale

2002-06-01T23:59:59.000Z

423

Al composition dependency of interface phonon in the wurtzite quantum cascade laser  

Science Journals Connector (OSTI)

The interface (IF) phonons of the wurtzite quantum cascade lasers (QCL) are investigated using the transfer-...0.2Ga0.8N/GaN and Al0.15Ga0.85N/GaN QCLs, and two IF modes can be changed into other modes if their w...

Gui-chu Chen ???; Guang-han Fan ???

2010-05-01T23:59:59.000Z

424

Two-cascade acousto-optic dispersive delay line for ultrashort laser pulses  

SciTech Connect (OSTI)

An optical dispersive delay line for controlling the spectral composition and phase of ultrashort laser pulses is considered. To control independently the spectral amplitude and spectral phase of pulses, it is proposed to use the cascade arrangement of two acousto-optic cells with different control signals. (letters)

Molchanov, V Ya; Chizhikov, S I; Yushkov, K B [National University of Science and Technology 'MISIS', Moscow (Russian Federation)

2011-08-31T23:59:59.000Z

425

Intracavity Sensing via Compliance Voltage in an External Cavity Quantum Cascade Laser  

SciTech Connect (OSTI)

We demonstrate a technique for gas phase spectroscopy and sensing by detecting changes in compliance voltage of an external cavity quantum cascade laser due to intracavity absorption. The technique is characterized and used to measure the absorption spectrum of water vapor and Freon-134a.

Phillips, Mark C.; Taubman, Matthew S.

2012-07-01T23:59:59.000Z

426

Arrays and Cascades of Fluorescent Liquid-Liquid Waveguides: Broadband Light Sources for  

E-Print Network [OSTI]

Arrays and Cascades of Fluorescent Liquid-Liquid Waveguides: Broadband Light Sources) microchannel waveguides with liquid cores containing fluorescent dyes, excited by incident light from an external halogen bulb. Simultaneous use of multiple fluorophores in a common solution, in a single L2 light

Prentiss, Mara

427

Thermionic/AMTEC cascade converter concept for high-efficiency space power  

SciTech Connect (OSTI)

This paper presents trade studies that address the use of the thermionic/AMTEC cell--a cascaded, high-efficiency, static power conversion concept that appears well-suited to space power applications. Both the thermionic and AMTEC power conversion approaches have been shown to be promising candidates for space power. Thermionics offers system compactness via modest efficiency at high heat rejection temperatures, and AMTEC offers high efficiency at modest heat rejection temperature. From a thermal viewpoint the two are ideally suited for cascaded power conversion: thermionic heat rejection and AMTEC heat source temperatures are essentially the same. In addition to realizing conversion efficiencies potentially as high as 35--40%, such a cascade offers the following perceived benefits: survivability; simplicity; technology readiness; and technology growth. Mechanical approaches and thermal/electric matching criteria for integrating thermionics and AMTEC into a single conversion device are described. Focusing primarily on solar thermal space power applications, parametric trends are presented to show the performance and cost potential that should be achievable with present-day technology in cascaded thermionic/AMTEC systems.

Hagan, T.H. van; Smith, J.N. Jr. [General Atomics, San Diego, CA (United States); Schuller, M. [PL/VTP, Kirtland AFB, NM (United States)

1996-12-31T23:59:59.000Z

428

Inverse Kirkendall mixing in collision cascades K. Nordlund* and R. S. Averback  

E-Print Network [OSTI]

in reactor mate- rials, and processing of materials by high strain conditions. Theoretical approaches as Co, but has a much smaller heat of mixing with Cu, comparison of cascade mixing in Ni effect,7 in which a vacancy flux drives a net solute flux in the opposite direction. Classical molecular

Nordlund, Kai

429

Modeling, Optimization, and Experimentation with a Two Stage Mixed Gas Cascaded Joule Thomson Cryoprobe  

E-Print Network [OSTI]

Modeling, Optimization, and Experimentation with a Two Stage Mixed Gas Cascaded Joule Thomson-stage Mixed Gas Joule Thomson (MGJT) cycle is capable of providing compact cooling for cryoprobes". A computational model of a commercially available two stage MGJT cryoprobe donated by American Medical Systems

Wisconsin at Madison, University of

430

State & Regional Resources  

Broader source: Energy.gov [DOE]

The Bioenergy Technologies Office partners with the National Biomass State and Regional Partnerships' five regional organizations that provide leadership in their regions with regard to policies...

431

Regional Summary Pacific Region Management Context  

E-Print Network [OSTI]

, for the Eastern Pacific Ocean, and the Western and Central Pacific Fishery Commission, for the Western PacificRegional Summary Pacific Region Management Context The Pacific Region includes California, Oregon, and Washington. Federal fisheries in this region are managed by the Pacific Fishery Management Council (PFMC

432

The nitrogen cascade from agricultural soils to the sea: modelling nitrogen transfers at regional watershed and global scales  

Science Journals Connector (OSTI)

...towards collection of wastewater in centralized sewers...Taking into account recycling of sewage to agriculture...rural areas) and wastewater treatment (in urban...3480 292 130 1030 wastewater treatment or recycling 735 2430 118 40 530...

2013-01-01T23:59:59.000Z

433

Influence of confined phonon modes on the thermal behavior of AlAs/GaAs quantum cascade structures  

Science Journals Connector (OSTI)

The thermal behavior of AlAs/GaAs quantum cascade structures is used to demonstrate the existence of confined and interface optical-phonon modes. The high conduction-band offset of this material system greatly improves the confinement of the electronic states and allows the realization of electroluminescence structures, where the optical power as a function of the temperature solely depends on the change of the upper-state lifetime induced by the longitudinal-optical-phonon population. We observed that the latter is proportional to the Bose-Einstein factor, with an appropriate phonon mode energy, which does not simply correspond to that of the GaAs bulk phonon (36-meV energy). In particular we show that the agreement between theory and experiment can be substantially improved when the confined and interface modes are taken into account in our calculation. Our results are corroborated by the threshold temperature dependence of lasers, with an active region based on similar structures.

C. Becker; C. Sirtori; H. Page; A. Robertson; V. Ortiz; X. Marcadet

2002-01-30T23:59:59.000Z

434

Thermodynamic analysis of a transcritical CO2/propylene (R744R1270) cascade system for cooling and heating applications  

Science Journals Connector (OSTI)

Abstract In this paper natural refrigerant propylene (R1270) has been proposed for transcritical cascade refrigeration system and analyzed. Propylene is used in the low temperature (LT) cycle and carbon dioxide is used in the high temperature (HT) cycle of the cascade transcritical refrigeration system. The proposed transcritical cascade cycle can be used for simultaneous cooling and heating applications. Thermal performance of the cascade cycle is evaluated for different combinations of design and operating variables and optimum performance parameters such as Topt, \\{COPmax\\} and mass flow of propylene and CO2 have been predicted. Design parameters include the evaporator temperature of LT cycle (TE), gas cooler outlet temperature (TC) and cascade heat exchanger temperature difference (DT). The results of the analysis show better thermal performance of CO2propylene transcritical cycle than subcritical cascade cycle and also better than N2OCO2 transcritical cycle. A methodology to obtain relevant performance diagrams and regression correlations to serve as a guideline for the design and optimization of transcritical CO2propylene cascade system has been developed.

Alok Manas Dubey; Suresh Kumar; Ghanshyam Das Agrawal

2014-01-01T23:59:59.000Z

435

Be dating of river terraces of Santo Domingo river, on Southeastern flank of the Mrida Andes, Venezuela: Tectonic and climatic  

E-Print Network [OSTI]

, Venezuela: Tectonic and climatic implications Oswaldo Guzmán a, b, *, Riccardo Vassallo b , Franck Audemard, Caracas 1081-A, Venezuela b ISTerre, Université de Savoie, CNRS, F-73376 Le Bourget du Lac, France c, Venezuela d Escuela de Geología, Minas y Geofísica, Facultad de Ingeniería, Universidad Central de Venezuela

436

Three-dimensional seismic study of structures and salt tectonics of Eugene Island Area offshore Louisiana, Gulf of Mexico  

E-Print Network [OSTI]

The Eugene Island OCS is one of the largest oil-producing areas in federally owned waters of the U.S. outer continental shelf. Fault development and salt tectonics are the most important structural features of the study area. The study is based...

Xiong, Ye

2012-06-07T23:59:59.000Z

437

South Atlantic continental margins of Africa: A comparison of the tectonic vs climate interplay on the evolution  

E-Print Network [OSTI]

South Atlantic continental margins of Africa: A comparison of the tectonic vs climate interplay on the evolution of equatorial west Africa and SW Africa margins Michel Se´ranne *, Zahie Anka UMR 5573 Dynamique February 2005; accepted 18 July 2005 Abstract Africa displays a variety of continental margin structures

Demouchy, Sylvie

438

U-PB ZIRCON AND TITANITE AGES OF LATE-TO POST-TECTONIC INTRUSIONS OF THE CORTLANDT-  

E-Print Network [OSTI]

U-PB ZIRCON AND TITANITE AGES OF LATE-TO POST-TECTONIC INTRUSIONS OF THE CORTLANDT- BEEMERVILLE, and monzonorite of the Cortlandt Complex 446±2Ma. Titanite from the Beemerville nepheline syenite has yielded.D., Aleinikoff, J.N., Amelin, Yuri; Merguerian, Charles; and Panish, P.T., 2012, U-Pb zircon and titanite ages

Merguerian, Charles

439

A Pilot Search for Evidence of Extrasolar Earth-analog Plate Tectonics  

E-Print Network [OSTI]

Relative to calcium, both strontium and barium are markedly enriched in Earth's continental crust compared to the basaltic crusts of other differentiated rocky bodies within the solar system. Here, we both re-examine available archived Keck spectra to place upper bounds on n(Ba)/n(Ca) and revisit published results for n(Sr)/n(Ca) in two white dwarfs that have accreted rocky planetesimals. We find that at most only a small fraction of the pollution is from crustal material that has experienced the distinctive elemental enhancements induced by Earth-analog plate tectonics. In view of the intense theoretical interest in the physical structure of extrasolar rocky planets, this search should be extended to additional targets.

Jura, M; Xu, S; Young, E D

2014-01-01T23:59:59.000Z

440

Above room-temperature operation of InAs/AlGaSb superlattice quantum cascade lasers emitting at 12 {mu}m  

SciTech Connect (OSTI)

The authors report on above-room-temperature operation of InAs/AlGaSb quantum cascade lasers emitting at 12 {mu}m. The laser structures are grown on a n-InAs (100) substrate using solid-source molecular beam epitaxy. An InAs/AlGaSb superlattice is used as an active part and an InAs double plasmon waveguide is used for optical confinement. Results show that increased doping concentration in the injection part of the active region expands the current operation range of the devices, allowing laser operation at and above room temperature. The observed threshold current density is 4.0 kA/cm{sup 2} at 300 K; the maximum operation temperature is 340 K.

Ohtani, K.; Moriyasu, Y.; Ohnishi, H.; Ohno, H. [Laboratory for Nanoelectronics and Semiconductor Spintronics, Research Institute of Electrical Communication, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 (Japan)

2007-06-25T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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.


441

Are there significant hydrothermal resources in the US part of the Cascade Range?  

SciTech Connect (OSTI)

The Cascade Range is a geothermal dichotomy. On the one hand, it is an active volcanic arc above a subducting plate and is demonstrably an area of high heat flow. On the other hand, the distribution of hydrothermal manifestations compared to other volcanic arcs is sparse, and the hydrothermal outflow calculated from stream chemistry is low. Several large estimates of undiscovered geothermal resources in the U.S. part of the Cascade Range prepared in the 1970s and early 1980s were based fundamentally on two models of the upper crust. One model assumed that large, partly molten, intrusive bodies exist in the upper 10 km beneath major volcanic centers and serve as the thermal engines driving overlying hydrothermal systems. The other model interpreted the coincident heat-flow and gravity gradients west of the Cascade crest in central Oregon to indicate a partly molten heat source at 10 {+-} 2 km depth extending {approx}30 km west from the axis of the range. Investigations of the past ten years have called both models into question. Large long-lived high-temperature hydrothermal systems at depths <3 km in the U.S. part of the Cascade Range appear to be restricted to silicic domefields at the Lassen volcanic center, Medicine Lake volcano, Newberry volcano, and possibly the Three Sisters. Federal land-use restrictions further reduce this list to Medicine Lake and Newberry. Dominantly andesitic stratocones appear to support only small transitory hydrothermal systems related to small intrusive bodies along the volcanic conduits. The only young caldera, at Crater Lake, supports only low- to intermediate-temperature hydrothermal systems. Most of the Cascade Range comprises basaltic andesites and has little likelihood for high-level silicic intrusions and virtually no potential for resultant large high-temperature hydrothermal systems. Undiscovered hydrothermal resources of the Cascade Range of the United States are substantially lower than previous estimates. The range does have potential for intermediate-temperature hot dry rock and localized low- to intermediate-temperature hydrothermal systems.

Muffler, L.J. Patrick; Guffanti, Marianne

1995-01-26T23:59:59.000Z

442

Geodetic Survey At Northern Basin & Range Region (Blewitt Et Al, 2005) |  

Open Energy Info (EERE)

Geodetic Survey At Northern Basin & Range Region Geodetic Survey At Northern Basin & Range Region (Blewitt Et Al, 2005) Exploration Activity Details Location Northern Basin and Range Geothermal Region Exploration Technique Geodetic Survey Activity Date Usefulness useful regional reconnaissance DOE-funding Unknown References Geoffrey Blewitt, William C. Hammond, Corne Kreemer (2005) Relating Geothermal Resources To Great Basin Tectonics Using Gps Retrieved from "http://en.openei.org/w/index.php?title=Geodetic_Survey_At_Northern_Basin_%26_Range_Region_(Blewitt_Et_Al,_2005)&oldid=401408" Categories: Exploration Activities DOE Funded Activities What links here Related changes Special pages Printable version Permanent link Browse properties 429 Throttled (bot load) Error 429 Throttled (bot load)

443

A Preliminary Regional Geothermal Assessment Of The Gulf Of Suez, Egypt |  

Open Energy Info (EERE)

Regional Geothermal Assessment Of The Gulf Of Suez, Egypt Regional Geothermal Assessment Of The Gulf Of Suez, Egypt Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: A Preliminary Regional Geothermal Assessment Of The Gulf Of Suez, Egypt Details Activities (0) Areas (0) Regions (0) Abstract: The tectonic setting of Egypt, in the northeastern corner of the African continent, suggests that it may possess significant geothermal resources, especially along its eastern margin. The most promising areas for geothermal development in the NW Red Sea-Gulf of Suez rift system are locations along the eastern shore of the Gulf of Suez that are characterized by surface thermal manifestations, including a cluster of hot springs with varied temperatures. The Gulf of Suez region is one of the most interesting geothermal areas in Egypt because of the high temperatures

444

Aerodynamic Losses and Heat Transfer in a Blade Cascade with 3-D Endwall Contouring  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Aerodynamic Losses and Heat Transfer in a Aerodynamic Losses and Heat Transfer in a Aerodynamic Losses and Heat Transfer in a Aerodynamic Losses and Heat Transfer in a Blade Cascade with 3 Blade Cascade with 3 - - D D Endwall Endwall Contouring Contouring Principal Investigator Principal Investigator Sumanta Acharya, Professor Sumanta Acharya, Professor Louisiana State University, Baton Rouge, Louisiana Louisiana State University, Baton Rouge, Louisiana Collaborators Collaborators Gazi Mahmood, Ph.D., Research Asqociate Gazi Mahmood, Ph.D., Research Asqociate Arun Saha, Ph.D., Research Associate Arun Saha, Ph.D., Research Associate Ross Gustafson, M.S. student Ross Gustafson, M.S. student SCIES Project 02 SCIES Project 02 - - 01 01 - - SR098 SR098 DOE COOPERATIVE AGREEMENT DE DOE COOPERATIVE AGREEMENT DE - - FC26 FC26 - - 02NT41431 02NT41431 Tom J. George, Program Manager, DOE/NETL

445

Cascading metallic gratings for broadband absorption enhancement in ultrathin plasmonic solar cells  

SciTech Connect (OSTI)

The incorporation of plasmonic nanostructures in the thin-film solar cells (TFSCs) is a promising route to harvest light into the nanoscale active layer. However, the light trapping scheme based on the plasmonic effects intrinsically presents narrow-band resonant enhancement of light absorption. Here we demonstrate that by cascading metal nanogratings with different sizes atop the TFSCs, broadband absorption enhancement can be realized by simultaneously exciting multiple localized surface plasmon resonances and inducing strong coupling between the plasmonic modes and photonic modes. As a proof of concept, we demonstrate of 66.5% in the photocurrent in an ultrathin amorphous silicon TFSC with two-dimensional cascaded gratings over the reference cell without gratings.

Wen, Long; Sun, Fuhe [Key Laboratory of Nanodevices and Applications-CAS and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123 (China); Chen, Qin, E-mail: qchen2012@sinano.ac.cn [Key Laboratory of Nanodevices and Applications-CAS and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123 (China); Peking University Shenzhen SOC Key Laboratory, PKU-HKUST Shenzhen-Hong Kong Institute, Hi-Tech Industrial Park South, Shenzhen 518057 (China)

2014-04-14T23:59:59.000Z

446

CONTROL OF POLLUTANT EMISSIONS IN NATURAL GAS DIFFUSION FLAMES BY USING CASCADE BURNERS  

SciTech Connect (OSTI)

The advanced CFDRC software package was installed on a SUN-SPARC dual processor workstation (UTPA funded). The literature pertinent to the project was collected. The physical model was set and all parameters and variables were identified. Based on the physical model, the geometric modeling and grid generation processes were performed using the CFD-GEOM (Interactive Geometric Modeling and Grid Generation software). A total number of 11160 cells (248 x 45) were generated. The venturis in the cascade were modeled as two-dimensional axisymmetric convergent nozzles around the jet. With the cascade being added to the jet, the geometric complexity of the problem increased; which required multi-domain structured grid systems to be connected and matched on the boundaries. The natural gas/propane jet diffusion flame is being numerically analyzed. The numerical computations are being conducted using the CFDRC-ACE+ (advanced computational environment) software package. The results are expected soon.

Ala Qubbaj

2001-03-30T23:59:59.000Z

447

Critical points and transitions in an electric power transmission model for cascading failure blackouts  

Science Journals Connector (OSTI)

Cascading failures in large-scale electric power transmission systems are an important cause of blackouts. Analysis of North American blackout data has revealed power law (algebraic) tails in the blackout size probability distribution which suggests a dynamical origin. With this observation as motivation we examine cascading failure in a simplified transmission system model as load power demand is increased. The model represents generators loads the transmission line network and the operating limits on these components. Two types of critical points are identified and are characterized by transmission line flow limits and generator capability limits respectively. Results are obtained for tree networks of a regular form and a more realistic 118-node network. It is found that operation near critical points can produce power law tails in the blackout size probability distribution similar to those observed. The complex nature of the solution space due to the interaction of the two critical points is examined.

B. A. Carreras; V. E. Lynch; I. Dobson; D. E. Newman

2002-01-01T23:59:59.000Z

448

Laser frequency stabilization to excited state transitions using electromagnetically induced transparency in a cascade system  

SciTech Connect (OSTI)

We demonstrate laser frequency stabilization to excited state transitions using cascade electromagnetically induced transparency. Using a room temperature Rb vapor cell as a reference, we stabilize a first diode laser to the D{sub 2} transition and a second laser to a transition from the intermediate 5P{sub 3/2} state to a highly excited state with principal quantum number n=19-70. A combined laser linewidth of 280{+-}50 kHz over a 100 {mu}s time period is achieved. This method may be applied generally to any cascade system and allows laser stabilization to an atomic reference in the absence of a direct absorption signal.

Abel, R. P.; Mohapatra, A. K.; Bason, M. G.; Pritchard, J. D.; Weatherill, K. J.; Raitzsch, U.; Adams, C. S. [Department of Physics, Durham University, Rochester Building, South Road, Durham DH1 3LE (United Kingdom)

2009-02-16T23:59:59.000Z

449

A high carrier injection terahertz quantum cascade laser based on indirectly pumped scheme  

SciTech Connect (OSTI)

A Terahertz quantum cascade laser with a rather high injection coupling strength based on an indirectly pumped scheme is designed and experimentally implemented. To effectively suppress leakage current, the chosen quantum cascade module of the device is based on a five-well GaAs/Al{sub 0.25}Ga{sub 0.75}As structure. The device lases up to 151?K with a lasing frequency of 2.67 THz. This study shows that the effect of higher energy states in carrier transport and the long-range tunnel coupling between states that belong to non-neighbouring modules have to be considered in quantum design of structures with a narrow injector barrier. Moreover, the effect of interface roughness scattering between the lasing states on threshold current is crucial.

Razavipour, S. G., E-mail: sgrazavi@uwaterloo.ca; Xu, C.; Wasilewski, Z. R.; Ban, D. [Department of Electrical and Computer Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave. W., Waterloo, Ontario N2L3G1 (Canada); Dupont, E.; Laframboise, S. R. [National Research Council, Blg. M-50, 1200 Montreal Rd., Ottawa, Ontario K1A0R6 (Canada); Chan, C. W. I.; Hu, Q. [Department of Electrical Engineering and Computer Science, Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2014-01-27T23:59:59.000Z

450

Collective Lamb shift of superradiant cascade emissions in an atomic ensemble  

E-Print Network [OSTI]

We calculate the collective Lamb shift of the cascade spontaneous emissions from an atomic ensemble driven by two-color classical fields. The correlated pair of photons (signal and idler) is generated by adiabatically driving the system with large-detuned light fields in four-wave-mixing condition. The signal photon from the upper transition of the diamond-type atomic levels is followed by the idler one which can be superradiant due to light-induced dipole-dipole interactions. We demonstrate that the collective Lamb shift of the idler photon is a cumulative effect of interaction energy, and investigate its dependence on a cylindrical geometry. Manipulating the collective frequency of cascade emissions enables frequency qubits that provide alternative robust elements in quantum network.

H. H. Jen

2015-01-21T23:59:59.000Z

451

Spontaneous current-layer fragmentation and cascading reconnection in solar flares: I. Model and analysis  

E-Print Network [OSTI]

Magnetic reconnection is commonly considered as a mechanism of solar (eruptive) flares. A deeper study of this scenario reveals, however, a number of open issues. Among them is the fundamental question, how the magnetic energy is transferred from large, accumulation scales to plasma scales where its actual dissipation takes place. In order to investigate this transfer over a broad range of scales we address this question by means of high-resolution MHD simulation. The simulation results indicate, that the magnetic-energy transfer to small scales is realized via a cascade of consecutive smaller and smaller flux-ropes (plasmoids), in analogy with the vortex-tube cascade in (incompressible) fluid dynamics. Both tearing and (driven) coalescence processes are equally important for the consecutive fragmentation of the magnetic field (and associated current density) to smaller elements. At the later stages a dynamic balance between tearing and coalescence processes reveals a steady (power-law) scaling typical for ca...

Brta, Miroslav; Karlick, Marian; Skla, Jan

2010-01-01T23:59:59.000Z

452

Modeling and controller synthesis for the cascaded H-bridge multilevel active power filter with ADALINE-based identifiers  

Science Journals Connector (OSTI)

This paper presents the averaged state-space modeling and controller synthesis methodology for the cascaded H-bridge multilevel active power filters (CHB-APFs). ... compensation and dc-link stabilization among th...

Yang Han; Lin Xu; Muhammad Mansoor Khan; Chen Chen

2011-06-01T23:59:59.000Z

453

A Comparison on PSO Variants in Calculating HEPWM Switching Angles for a Cascaded H-Bridge Multilevel Inverter  

Science Journals Connector (OSTI)

This paper presents a comparison study on the application of various PSO algorithms in calculating the Pulse Width Modulation (PWM) switching angles of a cascaded H-bridge multilevel inverter. It aims to investig...

Norkharziana Mohd Nayan; Naziha Ahmad Azli

2012-01-01T23:59:59.000Z

454

Linewidth of a quantum-cascade laser assessed from its frequency noise spectrum and impact of the current driver  

Science Journals Connector (OSTI)

We report on the measurement of the frequency noise properties of a 4.6-?m distributed-feedback quantum-cascade laser (QCL) operating in continuous wave near...?1...is used to convert the frequency fluctuations o...

L. Tombez; S. Schilt; J. Di Francesco; T. Fhrer; B. Rein; T. Walther

2012-11-01T23:59:59.000Z

455

Laser Action at High k-Space Values in Anti-Correlated Multi-Wavelength Quantum Cascade Lasers  

Science Journals Connector (OSTI)

A two-wavelength Quantum Cascade laser is reported in which one wavelength lases between subband states high in the k-space. Laser action at the two wavelengths is strongly...

Menzel, Stefan; Franz, Kale J; Wasserman, Daniel; Hoffman, Anthony J; Cockburn, John W; Gmachl, Claire F

456

Study of methods for lowering the lasing frequency of a terahertz quantum-cascade laser based on two quantum wells  

Science Journals Connector (OSTI)

Two mechanisms for achieving lower terahertz-range frequencies in quantum-cascade structures with two quantum wells based on GaAs/AlGaAs compounds are ... mechanism is based on the introduction of composite quantum

D. V. Ushakov; Yu. G. Sadofyev; N. Samal

2012-11-01T23:59:59.000Z

457

A coherent quantum cascade laser operating on a combination of even and odd levels of a three-barrier structure  

Science Journals Connector (OSTI)

For the creation of quantum cascade lasers with coherent (collisionless or ballistic) electron ... a level formed from the levels of adjacent quantum wells with different parity of the electron ... increasing the...

. A. Gelvich; E. I. Golant; A. B. Pashkovski?

2006-03-01T23:59:59.000Z

458

Latitudinal gradients of coniferous tree species, vegetation, and climate in the Sierran-Cascade axis of Northern California  

Science Journals Connector (OSTI)

Latitudinal gradients of tree species composition along the Sierran/Cascade axis in northern California were explored by comparing forests of Lassen Volcanic and Yosemite National Parks, USA. A calibration pro...

Albert J. Parker

1994-12-01T23:59:59.000Z

459

Mode-locked terahertz quantum cascade laser by direct phase synchronization  

SciTech Connect (OSTI)

Mode-locking of a terahertz quantum cascade laser is achieved using multimode injection seeding. Contrary to standard methods that rely on gain modulation, here a fixed phase relationship is directly imprinted to the laser modes. In this work, we demonstrate the generation of 9 ps phase mode-locked pulses around 2.75 THz. A direct measurement of the emitted field phase shows that it results from the phase of the initial injection.

Maussang, K.; Maysonnave, J.; Jukam, N.; Freeman, J. R.; Cavali, P.; Dhillon, S. S.; Tignon, J. [Laboratoire Pierre Aigrain, Ecole Normale Suprieure, CNRS (UMR 8551), Universit P. et M. Curie, Universit D. Diderot, 75005 Paris (France); Khanna, S. P.; Linfield, E. H.; Davies, A. G. [School of Electronic and Electrical Engineering, University of Leeds, Leeds LS9 2JT (United Kingdom); Beere, H. E.; Ritchie, D. A. [University of Cambridge, Cavendish Lab, Cambridge CB3 0HE (United Kingdom)

2013-12-04T23:59:59.000Z

460

Fast Hyperspectral Imaging Using a Mid-Infrared Tunable External Cavity Quantum Cascade Laser  

SciTech Connect (OSTI)

An active hyperspectral imaging system using an external cavity quantum cascade laser and a focal plane array acquiring images at 25 Hz from 985 cm-1 to 1075 cm-1 with a resolution of 0.3 cm 1 is demonstrated. The chemical imaging of gases is demonstrated in both static and dynamic cases. The system was also used to analyze liquid and solid samples.

Phillips, Mark C.; Ho, Nicolas

2008-04-23T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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

External Cavity Quantum Cascade Laser for Quartz Tuning Fork Photoacoustic Spectroscopy of Broad Absorption Features  

SciTech Connect (OSTI)

We demonstrate mid-infrared spectroscopy of large molecules with broad absorption features using a tunable external cavity quantum cascade laser. Absorption spectra for two different Freons are measured over the range 1130-1185 cm-1 with 0.2 cm-1 resolution via laser photoacoustic spectroscopy with quartz tuning forks as acoustic transducers. The measured spectra are in excellent agreement with published reference absorption spectra.

Phillips, Mark C.; Myers, Tanya L.; Wojcik, Michael D.; Cannon, Bret D.

2007-05-01T23:59:59.000Z

462

Quantum cascade lasers: a versatile source for precise measurements in the mid/far-infrared range  

Science Journals Connector (OSTI)

We provide an overview of recent developments of quantum cascade lasers (QCLs), from the mid-infrared (mid-IR) to the far-IR (THz) range, with a special focus on their metrological-grade applications in a number of fields. A special emphasis on the physics of the QCLs allows underlining peculiar effects and device features recently unveiled that pave the way to novel demanding photonics applications.

S Bartalini; M S Vitiello; P De Natale

2014-01-01T23:59:59.000Z

463

Enantioselectivity in Organocatalytic Cascade Double Michael Addition Reaction: A Theoretical Study  

Science Journals Connector (OSTI)

(38, 39) To consider the solvent effect on reaction, single-point PCM//B3LYP/6-311++G(d,p) calculations with self-consistent reaction field(40-42) based on polarizable continuum model (PCM)(43, 44) were applied for all gas-phase optimized structures. ... The application of cascade reactions to natural products synthesis represents a particularly demanding task, but the results can be both stunning and instructive. ...

Nan Lu; Lin Meng; Dezhan Chen; Guiqiu Zhang

2011-10-10T23:59:59.000Z

464

Cascade Problems in Some Atomic Lifetime Measurements at a Heavy-Ion Storage Ring  

SciTech Connect (OSTI)

Lifetimes of 3s{sup 2}3p{sup k} ground configuration levels of Al-, Si-, P-, and S-like ions of Be, Co, and Ni have been measured at a heavy-ion storage ring. Some of the observed decay curves show strong evidence of cascade repopulation from specific 3d levels that feature lifetimes in the same multi-millisecond range as the levels of the ground configuration.

Trabert, E; Hoffmann, J; Krantz, C; Wolf, A; Ishikawa, Y; Santana, J

2008-10-09T23:59:59.000Z

465

Separation of Fine Particles from Gases in Wet Flue Gas Desulfurization System Using a Cascade of Double Towers  

Science Journals Connector (OSTI)

Separation of Fine Particles from Gases in Wet Flue Gas Desulfurization System Using a Cascade of Double Towers ... The authors thank the High-Tech Research and Development Program of China (No. 2008AA05Z306), the Natural Science Foundation of Jiangsu Province (No. BK2008283), and the Scientific Research Foundation of Graduate School of Southeast University for their financial support. ... with high performance by cascading packed columns. ...

Jingjing Bao; Linjun Yang; Shijuan Song; Guilong Xiong

2012-02-15T23:59:59.000Z

466

Topological Analysis and Mitigation Strategies for Cascading Failures in Power Grid Networks  

E-Print Network [OSTI]

Recently, there has been a growing concern about the overload status of the power grid networks, and the increasing possibility of cascading failures. Many researchers have studied these networks to provide design guidelines for more robust power grids. Topological analysis is one of the components of system analysis for its robustness. This paper presents a complex systems analysis of power grid networks. First, the cascading effect has been simulated on three well known networks: the IEEE 300 bus test system, the IEEE 118 bus test system, and the WSCC 179 bus equivalent model. To extend the analysis to a larger set of networks, we develop a network generator and generate multiple graphs with characteristics similar to the IEEE test networks but with different topologies. The generated graphs are then compared to the test networks to show the effect of topology in determining their robustness with respect to cascading failures. The generated graphs turn out to be more robust than the test graphs, showing the...

Pahwa, Sakshi; Schulz, Noel

2012-01-01T23:59:59.000Z

467

Fundamental Frequency Switching Control of Seven-Level Hybrid Cascaded H-bridge Multilevel Inverter  

SciTech Connect (OSTI)

This paper presents a cascaded H-bridge multilevel inverter that can be implemented using only a single dc power source and capacitors. Standard cascaded multilevel inverters require n dc sources for 2n + 1 levels. Without requiring transformers, the scheme proposed here allows the use of a single dc power source (e.g., a battery or a fuel cell stack) with the remaining n-1 dc sources being capacitors, which is referred to as hybrid cascaded H-bridge multilevel inverter (HCMLI) in this paper. It is shown that the inverter can simultaneously maintain the dc voltage level of the capacitors and choose a fundamental frequency switching pattern to produce a nearly sinusoidal output. HCMLI using only a single dc source for each phase is promising for high-power motor drive applications as it significantly decreases the number of required dc power supplies, provides high-quality output power due to its high number of output levels, and results in high conversion efficiency and low thermal stress as it uses a fundamental frequency switching scheme. This paper mainly discusses control of seven-level HCMLI with fundamental frequency switching control and how its modulation index range can be extended using triplen harmonic compensation.

Du, Zhong [ORNL; Chiasson, John N [ORNL; Ozpineci, Burak [ORNL; Tolbert, Leon M [ORNL

2009-01-01T23:59:59.000Z

468

Analysis and optimization of cascade Rankine cycle for liquefied natural gas cold energy recovery  

Science Journals Connector (OSTI)

Abstract This study proposes a new concept called the cascade Rankine cycle, which recovers LNG (liquefied natural gas) cold energy for power generation, optimizes the cycle by investigating the effects of key parameters on its performance, and compares its thermal efficiency, exergy efficiency and economic evaluation to those of the conventional alternatives. The cascade Rankine cycle consists of multiple stages of the organic Rankine cycle in a layered structure in which the first stage encompasses the second one that, in turn, encompasses the next. Due to its layered configuration, optimization of the cycle is straightforward and involves sequentially optimizing the individual stages. Optimization of the subsequent stages, however, required process simulation considering the equipment efficiency and the thermodynamic properties of the working fluid. Process simulation indicated that the indicators such as net power output, thermal efficiency, and exergy efficiency generally increase as the number of stages increases. These indicators were, however, significantly affected by the thermodynamic properties of the working fluids. The proposed cycles demonstrated significantly better performance in these indicators than the conventional cycles. The three-stage cascade Rankine cycle with propane as the working fluid exhibited the highest net power output, thermal efficiency and exergy efficiency within the set.

In-Hwan Choi; Sangick Lee; Yutaek Seo; Daejun Chang

2013-01-01T23:59:59.000Z

469

FERMI @ Elettra -- A Seeded Harmonic Cascade FEL for EUV and SoftX-rays  

SciTech Connect (OSTI)

We describe the machine layout and major performance parameters for the FERMI FEL project funded for construction at Sincrotrone Trieste, Italy, within the next five years. The project will be the first user facility based on seeded harmonic cascade FELs, providing controlled, high peak-power pulses. With a high-brightness rf photocathode gun, and using the existing 1.2 GeV S-band linac, the facility will provide tunable output over a range from {approx}100 nm to {approx}10nm, with pulse duration from 40 fs to {approx} 1 ps, peak power GW, and with fully variable output polarization. Initially, two FEL cascades are planned; a single-stage harmonic generation to operate >40 nm, and a two stage cascade operating from {approx}40 nm to {approx}10 nm or shorter wavelength. The output is spatially and temporally coherent, with peak power in the GW range. Lasers provide modulation to the electron beam, as well as driving the photocathode and other systems, and the facility will integrate laser systems with the accelerator infrastructure, including a state-of-the-art optical timing system providing synchronization of rf signals, lasers, and x-ray pulses. Major systems and overall facility layout are described, and key performance parameters summarized.

Bocchetta, C.; Bulfone, D.; Craievich, P.; Danailov, M.B.; D'Auria,G.; DeNinno, G.; Di Mitri, S.; Diviacco, B.; Ferianis, M.; Gomezel, A.; Iazzourene, F.; Karantzoulis, E.; Parmigiani, F.; Penco, G.; Trovo, M.; Corlett, J.; Fawley, W.; Lidia, S.; Penn, G.; Ratti, A.; Staples, J.; Wilcox, R.; Zholents, A.; Graves, W.; Ilday, F.O.; Kaertner,F.; Wang, D.; Zwart, T.; Cornacchia, M.; Emma, P.; Huang, Z.; Wu, J.

2005-09-01T23:59:59.000Z

470

FERMI@Elettra: A Seeded Harmonic Cascade FEL for EUV and Soft X-Rays  

SciTech Connect (OSTI)

We describe the machine layout and major performance parameters for the FERMI FEL project funded for construction at Sincrotrone Trieste, Italy, within the next five years. The project will be the first user facility based on seeded harmonic cascade FEL's, providing controlled, high peak-power pulses. With a high-brightness rf photocathode gun, and using the existing 1.2 GeV S-band linac, the facility will provide tunable output over a range from {approx}100 nm to {approx}10 nm, with pulse duration from 40 fs to {approx} 1ps, peak power {approx}GW, and with fully variable output polarization. Initially, two FEL cascades are planned; a single-stage harmonic generation to operate > 40 nm, and a two-stage cascade operating from {approx}40 nm to {approx}10 nm or shorter wavelength. The output is spatially and temporally coherent, with peak power in the GW range. Lasers provide modulation to the electron beam, as well as driving the photocathode and other systems, and the facility will integrate laser systems with the accelerator infrastructure, including a state-of-the-art optical timing system providing synchronization of rf signals, lasers, and x-ray pulses. Major systems and overall facility layout are described, and key performance parameters summarized.

Bocchetta, C.J.; Bulfone, D.; Craievich, P.; Danailov, M.B.; D'Auria, G.; De Ninno, G.; Di Mitri, S.; Diviacco, B.; Ferianis, M.; Gomezel, A.; Iazzourene, F.; Karantzoulis, E.; Parmigiani, F.; Penco, G.; Trovo, M.; /Sincrotrone Trieste; Corlett, J.; Fawley, W.; Lidia, S.; Penn, G.; Ratti, A.; Staples, J.; /LBL, Berkeley /MIT /SLAC

2005-12-14T23:59:59.000Z

471

Kinetic cascade beyond magnetohydrodynamics of solar wind turbulence in two-dimensional hybrid simulations  

Science Journals Connector (OSTI)

The nature of solar windturbulence in the dissipation range at scales much smaller than the large magnetohydrodynamic (MHD) scales remains under debate. Here a two-dimensional model based on the hybrid code abbreviated as A.I.K.E.F. is presented which treats massive ions as particles obeying the kinetic Vlasov equation and massless electrons as a neutralizing fluid. Up to a certain wavenumber in the MHD regime the numerical system is initialized by assuming a superposition of isotropic Alfvn waves with amplitudes that follow the empirically confirmed spectral law of Kolmogorov. Then turbulence develops and energy cascades into the dispersive spectral range where also dissipative effects occur. Under typical solar wind conditions weak turbulence develops as a superposition of normal modes in the kinetic regime. Spectral analysis in the direction parallel to the background magnetic field reveals a cascade of left-handed Alfvn/ion-cyclotron waves up to wave vectors where their resonant absorption sets in as well as a continuing cascade of right-handed fast-mode and whistler waves. Perpendicular to the background field a broad turbulent spectrum is found to be built up of fluctuations having a strong compressive component. Ion-Bernstein waves seem to be possible normal modes in this propagation direction for lower driving amplitudes. Also signatures of short-scale pressure-balanced structures (very oblique slow-mode waves) are found.

D. Verscharen; E. Marsch; U. Motschmann; J. Mller

2012-01-01T23:59:59.000Z

472

Boosting searches for natural supersymmetry with R-parity violation via gluino cascades  

Science Journals Connector (OSTI)

In the presence of even minuscule baryonic R-parity violation (RPV), the stop can be the lightest superpartner and evade LHC searches because it decays into two jets. In order to cover this interesting possibility, we here consider new searches for RPV stops produced in gluino cascades. While typical searches for gluinos decaying to stops rely on same-sign dileptons, the RPV cascades usually have fewer hard leptons, less excess missing energy, and more jets than R-parity conserving cascades. If the gluino is a Dirac fermion, same-sign dilepton signals are also often highly depleted. We therefore explore search strategies that use single-lepton channels, and combat backgrounds using HT, jet counting, and more detailed multijet kinematics or jet substructure. We demonstrate that the stop mass peaks can be fully reconstructed over a broad range of spectra, even given the very high jet multiplicities. This would not only serve as a double-discovery opportunity, but would also be a spectacular confirmation that the elusive top partner has been hiding in multijets.

Zhenyu Han; Andrey Katz; Minho Son; Brock Tweedie

2013-04-02T23:59:59.000Z

473

Effects of temporal correlations on cascades: Threshold models on temporal networks  

Science Journals Connector (OSTI)

A person's decision to adopt an idea or product is often driven by the decisions of peers, mediated through a network of social ties. A common way of modeling adoption dynamics is to use threshold models, where a node may become an adopter given a high enough rate of contacts with adopted neighbors. We study the dynamics of threshold models that take both the network topology and the timings of contacts into account, using empirical contact sequences as substrates. The models are designed such that adoption is driven by the number of contacts with different adopted neighbors within a chosen time. We find that while some networks support cascades leading to network-level adoption, some do not: the propagation of adoption depends on several factors from the frequency of contacts to burstiness and timing correlations of contact sequences. More specifically, burstiness is seen to suppress cascade sizes when compared to randomized contact timings, while timing correlations between contacts on adjacent links facilitate cascades.

Ville-Pekka Backlund; Jari Saramki; Raj Kumar Pan

2014-06-26T23:59:59.000Z

474

Coal in the Northern Rocky Mountains and Great Plains Region -- Clean, compliant, and available  

SciTech Connect (OSTI)

The Northern Rocky Mountains and Great Plains region produced over 340 million short tons of coal in 1997, approximately 30 percent of the nation`s total coal production. Coals from this region are shipped to 26 states in the western, midwest, southern, and eastern US and production is projected to increase to 415 million short tons by 2015; the projected increase will be utilized primarily for production of electric power. The coals are economically attractive because they can be produced by surface mining, and do not require costly beneficiation to be compliant with emission standards. The coals are compliant because their chemical composition was influenced by tectonic settings of the coal basins and provenance of the sediments entering the basins. Tectonics during the Paleocene also influenced rates of precipitation and depositional systems. These factors, in concert, controlled the amount, distribution, and levels of sulfur, ash, and trace elements of environmental concern in the region`s coals. The emphasis of this paper is on the chemistry of these thick, high-quality coals and the geologic controls that resulted in their accumulation.

Stricker, G.D.; Ellis, M.S.; Flores, R.M.; Bader, L.R. [Geological Survey, Denver, CO (United States)

1998-12-31T23:59:59.000Z

475

Tectonic development of the Samail ophiolite: High-precision U-Pb zircon geochronology and Sm-Nd isotopic constraints on crustal growth and emplacement  

E-Print Network [OSTI]

New high-precision single grain U-Pb zircon geochronology and whole rock Nd isotopic data provide insight into the magmatic and tectonic development of the Samail ophiolite. The analyzed rocks can be broadly divided into ...

Rioux, Matthew

476

Detrital thermochronology of the Alpine foreland basin in Central Switzerland: Insights into tectonic and erosion history of the North Central Alps  

E-Print Network [OSTI]

This study systematically integrates zircon U-Pb geochronology and (U-Th)/He low-temperature thermochronology to correlate the Northern Alpine Foreland Basin (NAFB) sediment provenance and the tectonic and thermal evolution of the thrust stack...

Miller, Joseph Christopher

2012-12-31T23:59:59.000Z

477

Orientation of tectonic stresses in central Kentucky during U. Devonian/L. Mississippian times: Evidence from quartz veins (after gypsum) in NE-trending, systematic joints in shales  

SciTech Connect (OSTI)

Quartz replacing fibrous gypsum and anhydrite pseudomorphically (QAS; quartz after sulfate''), and preserving characteristic crack-seal'' and chickenwire'' textures, occurs in extensional veins at four locations in central KY. The veins occupy a systematic set of NE-SW-trending, vertical joints within the essentially flat-lying shales of the Renfro Member of the Mississippian Borden Formation and the Late Devonian New Albany Shale. The four QAS occurrences discovered to date are located northeast of the Borden Front. At one site in the New Albany Shale, QAS veins show clear evidence of penecontemporaneous deformation. It is proposed that at all QAS locations, gypsum precipitated in incipient joints before complete lithification of the sediment, and grew perpendicular to the fractures to form extensional veins in the soft but firm muds. The orientations of the joints now marked by QAS veins are broadly consistent with regional patterns of NE-SW-trending systematic joints and lineaments in southern IN and in central and eastern KY. These systematic fracture patterns do not correspond directly to known basement faults or rift systems, although they are consistent with modern stress directions in eastern and western KY, measured in situ in wells and by earthquake fault-plane solutions. It is proposed that this systematic trend marks the regional tectonic stress pattern characteristic of southern IN and central and eastern KY at, and since the Late Devonian. The evidence of penecontemporaneous sedimentary deformation in joints of U. Devonian age, marked and preserved by quartz replacement of early gypsum, is sufficient to show that while the systematic NE-trending joint set in KY may also be modern it is not uniquely so.

Grover, J.; Dupuis-Nouille, E.M. (Univ. of Cincinnati, Cincinnati, OH (United States). Dept. of Geology)

1992-01-01T23:59:59.000Z

478

2014 REGIONAL ECONOMIC OUTLOOK  

E-Print Network [OSTI]

2014 REGIONAL ECONOMIC OUTLOOK #12;2014 REGIONAL ECONOMIC OUTLOOK 2014 Overview The Cincinnati USA Partnership for Economic Development and the Northern Kentucky Chamber of Commerce are pleased to present the 2014 Regional Economic Outlook. This report was prepared by the Cincinnati USA Partnership's Regional

Boyce, Richard L.

479

Oil and gas entrapment, Louisiana shelf, offshore Gulf Coast region  

SciTech Connect (OSTI)

Oil and gas accumulations in the Louisiana offshore are caused by vertical hydrocarbon migration. Source beds for both thermal gas and oil lie considerably deeper than reservoirs. The required vertical pathways are steeply dipping faults and salt structures (ridges and diapirs). Faults and salt structures indicate the continuing presence of rift structures that began along a normal passive continental margin during the Pennsylvanian. Tectonic trends are northeast, northwest, north, and west-east; they follow well-established regional stress systems. Listric and growth faults commonly are too shallow for vertical hydrocarbon migration and require connection with vertical faults. Vertical oil and gas migration is predictable in its directions. The underlying geological, geophysical, and geochemical processes are understood and are not different from such processes in other productive basins. Secondary salt layers at shallower levels cause interruptions of vertical oil and gas migration; at the same time these interruptions seem to indicate a large future exploration potential on the Louisiana shelf.

Pratsch, J.C.

1989-09-01T23:59:59.000Z

480

A quantum cascade laser-based optical feedback cavity-enhanced absorption spectrometer for the simultaneous measurement ofCH4 and N2O in air  

Science Journals Connector (OSTI)

Optical feedback cavity-enhanced absorption spectroscopy (OF CEAS) has been demonstrated with a thermoelectrically cooled continuous wave distributed feedback quantum cascade laser (QCL) operating at wavelengths ...

D. J. Hamilton; A. J. Orr-Ewing

2011-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "region cascades tectonic" 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.


481

Quantum Cascade Laser Spectroscopy and Photoinduced Chemistry of Al(CO)n Clusters in Helium Nanodroplets  

Science Journals Connector (OSTI)

Quantum Cascade Laser Spectroscopy and Photoinduced Chemistry of Al(CO)n Clusters in Helium Nanodroplets ... Only aluminum carbonyl clusters of the form Al(CO)n are observed in this study, and a future report will discuss the larger Alm(CO)n species. ... The QCL frequency is tuned by rotating a grating with a stepper motor (0.01 cm1 steps) or by scanning the cavity length continuously (?30 GHz tuning) by applying a 0100 V sine wave ramp to a piezo element. ...

Tao Liang; Steven D. Flynn; Alexander M. Morrison; Gary E. Douberly

2011-05-26T23:59:59.000Z

482

Cascaded spin motive force driven by the dynamics of the skyrmion lattice  

SciTech Connect (OSTI)

We numerically investigate the spin motive force (SMF) driven by the dynamics of a Skyrmion lattice. The rotating mode of the Skyrmion core excited by the AC magnetic field induces the large spin-dependent electric field near the core. Due to the collective dynamics of Skyrmion lattice, the measurable voltage is enhanced by the cascade effect of the SMF. The amplitude of the AC voltage is estimated to 30??V in a macroscopic sample, where 100 Skyrmions exist between two probes. We also investigate the SMF due to the dynamics of the helical magnetic state, where the enhancement of the SMF does not occur.

Ohe, Jun-ichiro; Shimada, Yuhki [Department of Physics, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510 (Japan)] [Department of Physics, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510 (Japan)

2013-12-09T23:59:59.000Z

483

Detection and measurement of electroreflectance on quantum cascade laser device using Fourier transform infrared microscope  

SciTech Connect (OSTI)

We demonstrate the use of a Fourier Transform Infrared microscope system to detect and measure electroreflectance (ER) from mid-infrared quantum cascade laser (QCL) device. To characterize intersubband transition (ISBT) energies in a functioning QCL device, a microscope is used to focus the probe on the QCL cleaved mirror. The measured ER spectra exhibit resonance features associated to ISBTs under applied electric field in agreement with the numerical calculations and comparable to observed photocurrent, and emission peaks. The method demonstrates the potential as a characterization tool for QCL devices.

Enobio, Eli Christopher I.; Ohtani, Keita; Ohno, Yuzo; Ohno, Hideo, E-mail: ohno@riec.tohoku.ac.jp [Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan)] [Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan)

2013-12-02T23:59:59.000Z

484

Improving proton-induced one-nucleon removal in intranuclear cascade  

E-Print Network [OSTI]

It is a well-established fact that intranuclear-cascade models generally fail to consistently reproduce the cross sections for one-proton and one-neutron removal from stable nuclei by a high-energy proton beam. We use simple shell-model calculations to investigate the reasons of this deficiency. We find that a refined description of the neutron skin and of the energy density in the nuclear surface is crucial for the aforementioned observables, and that neither ingredient is sufficient if taken separately. As a by-product, the predictions for removal of several nucleons are also improved by the refined treatment.

Davide Mancusi; Alain Boudard; Jaume Carbonell; Joseph Cugnon; Jean-Christophe David; Sylvie Leray

2014-11-17T23:59:59.000Z

485

Multi-wavelength surface emitting quantum cascade laser based on equivalent phase shift  

SciTech Connect (OSTI)

A novel surface emitting distributed feedback quantum cascade laser emitting around ????4.6??m is demonstrated by employing an equivalent phase shift (EPS) of quarter-wave (?/4). The EPS is fabricated through extending one sampling period by 50% in the center of a sampled Bragg grating. Single-lobed far-field radiation pattern with a low divergence angle of about 0.6??16.8 is obtained. Selective single-mode lasing with a mean side mode suppression ratio above 20?dB and wavelength coverage range of 72?nm is achieved simultaneously on a single wafer only by changing the sampling period.

Zhang, J. C., E-mail: zhangjinchuan@semi.ac.cn; Liu, F. Q., E-mail: fqliu@semi.ac.cn; Yao, D. Y.; Wang, L. J.; Yan, F. L.; Liu, J. Q.; Wang, Z. G. [Institute of Semiconductors, Key Laboratory of Semiconductor Materials Science, Chinese Academy of Sciences, Beijing, 100083, Peoples Republic of China and Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Beijing 100083 (China)

2014-01-21T23:59:59.000Z

486

Standoff reflectionabsorption spectra of surface adsorbed explosives measured with pulsed quantum cascade lasers  

Science Journals Connector (OSTI)

Abstract We demonstrate a standoff detection scheme of surface adsorbed explosives based on the broadband quantum cascade laser (QCL) infrared reflectionabsorption spectroscopy and ultraviolet laser photodecomposition. We utilized a sub-second rapid-scan data acquisition scheme to record continuously scanned spectra which revealed the broad-band absorption features of surface adsorbed explosive molecules such as cyclotrimethylene trinitramine (RDX) and trinitrotoluene with a surface concentration of 1?g/cm2. The standoff QCL spectra perfectly reproduce the reflectance spectra obtained with a conventional Fourier transform infrared spectroscopy instrument. The conformation conversion of RDX molecules is also observed and studied.

Xunchen Liu; Charles W. Van Neste; Manisha Gupta; Ying Y. Tsui; Seonghwan Kim; Thomas Thundat

2014-01-01T23:59:59.000Z

487

An 8-{mu}m quantum cascade laserproduced by the metalorganic vapour phase epitaxy method  

SciTech Connect (OSTI)

An 8-{mu}m quantum cascade laser is fabricated by the metalorganic vapour phase epitaxy method. A scheme of vertical transitions in a structure consisting of three quantum wells is used. The laser operates in a pulsed regime at temperatures up to 250 K. The threshold current density was about 3 kA cm{sup -2} and increased up to 6 kA cm{sup -2} at 250 K. The 1-{mu}s pulse power in the multimode regime was 45 mW at 77 K.

Zasavitskii, I I; Pashkeev, D A [P N Lebedev Physical Institute, Russian Academy of Sciences, Moscow (Russian Federation); Marmalyuk, Aleksandr A; Ryaboshtan, Yu L [M.F. Stel'makh Polyus Research and Development Institute, Moscow (Russian Federation); Mikaelyan, G T [OJSC Research and Manufacturing Enterprise 'Inject', Saratov (Russian Federation)

2010-02-28T23:59:59.000Z

488

Role of collisional broadening in Monte Carlo simulations of terahertz quantum cascade lasers  

SciTech Connect (OSTI)

Using a generalized version of Fermi's golden rule, collisional broadening is self-consistently implemented into ensemble Monte Carlo carrier transport simulations, and its effect on the transport and optical properties of terahertz quantum cascade lasers is investigated. The inclusion of broadening yields improved agreement with the experiment, without a significant increase of the numerical load. Specifically, this effect is crucial for a correct modeling at low biases. In the lasing regime, broadening can lead to significantly reduced optical gain and output power, affecting the obtained current-voltage characteristics.

Matyas, Alpar; Lugli, Paolo; Jirauschek, Christian [Institute for Nanoelectronics, Technische Universitaet Muenchen, D-80333 Munich (Germany)] [Institute for Nanoelectronics, Technische Universitaet Muenchen, D-80333 Munich (Germany)

2013-01-07T23:59:59.000Z

489

Quantum Cascade Laser Development Efforts for Implementation into Chemical and Remote Sensing Systems  

SciTech Connect (OSTI)

Quantum cascade lasers (QCL) offer many desirable attributes as mid-infrared laser sources for chemical and remote sensing. Some key advantages are a narrow linewidth, wide bandwidth current modulation characteristics and moderate tunability (15 cm-1). Combined, these characteristics allow for applications to a wide variety of chemical and remote sensing techniques such as wavelength and frequency modulation based detection techniques, cavity enhanced point sensors as well as techniques such as LIDAR and DIAL. This paper will describe laser development efforts to enhance QCL frequency stabilization and QCL injection locking and to develop robust external cavity QCL designs.

Wojcik, Michael D.; Myers, Tanya L.; Taubman, Matthew S.; Cannon, Bret D.; Broocks, Bryan T.; Mosely, Trinesha

2004-12-01T23:59:59.000Z

490

Note: Switch-Mode Hybrid Current Controllers for Quantum Cascade Lasers  

SciTech Connect (OSTI)

Chemical sensing in the mid-infrared has been revolutionized by the advent of quantum cascade lasers. Their higher current and voltage demands compared to laser diodes however, negatively impact size, weight and power footprint for fieldable systems, particularly in hot environments. This letter presents a switch-mode/linear hybrid controller design, furnishing low-noise drive current up to 2 amperes at compliance voltages up to 15 volts, with noise levels close to the Johnson noise of the internal resistors. Current modulation from near zero to 1.8 Amps is also demonstrated at frequencies up to a kilohertz.

Taubman, Matthew S.

2013-01-07T23:59:59.000Z

491

Chirped laser dispersion spectroscopy using a directly modulated quantum cascade laser  

SciTech Connect (OSTI)

Chirped laser dispersion spectroscopy (CLaDS) utilizing direct modulation of a quantum cascade laser (QCL) is presented. By controlling the laser bias nearly single- and dual-sideband CLaDS operation can be realized in an extremely simplified optical setup with no external optical modulators. Capability of direct single-sideband modulation is a unique feature of QCLs that exhibit a low linewidth enhancement factor. The developed analytical model shows excellent agreement with the experimental, directly modulated CLaDS spectra. This method overcomes major technical limitations of mid-infrared CLaDS systems by allowing significantly higher modulation frequencies and eliminating optical fringes introduced by external modulators.

Hangauer, Andreas, E-mail: hangauer@princeton.edu; Nikodem, Michal; Wysocki, Gerard, E-mail: gwysocki@princeton.edu [Electrical Engineering Department, Princeton University, Princeton, New Jersey 08544 (United States)] [Electrical Engineering Department, Princeton University, Princeton, New Jersey 08544 (United States); Spinner, Georg [Electrical Engineering Department, Princeton University, Princeton, New Jersey 08544 (United States) [Electrical Engineering Department, Princeton University, Princeton, New Jersey 08544 (United States); Institute for Quantum Electronics, ETH Zurich, 8093 Zurich (Switzerland)

2013-11-04T23:59:59.000Z

492

Standoff Hyperspectral Imaging of Explosives Residues Using Broadly Tunable External Cavity Quantum Cascade Laser Illumination  

SciTech Connect (OSTI)

We describe experimental results on the detection of explosives residues using active hyperspectral imaging by illumination of the target surface using an external cavity quantum cascade laser (ECQCL) and imaging using a room temperature microbolometer camera. The active hyperspectral imaging technique forms an image hypercube by recording one image for each tuning step of the ECQCL. The resulting hyperspectral image contains the full absorption spectrum produced by the illumination laser at each pixel in the image which can then be used to identify the explosive type and relative quantity using spectral identification approaches developed initially in the remote sensing community.

Bernacki, Bruce E.; Phillips, Mark C.

2010-05-01T23:59:59.000Z

493

Room temperature continuous wave operation of quantum cascade lasers with 12.5% wall plug efficiency  

SciTech Connect (OSTI)

An InP based quantum cascade laser heterostructure emitting at 4.6 {mu}m was grown with gas-source molecular beam epitaxy. The wafer was processed into a conventional double-channel ridge waveguide geometry with ridge widths of 19.7 and 10.6 {mu}m without semi-insulating InP regrowth. An uncoated, narrow ridge device with a 4.8 mm cavity length was epilayer down bonded to a diamond submount and exhibits 2.5 W maximum output power with a wall plug efficiency of 12.5% at room temperature in continuous wave operation.

Bai, Y.; Slivken, S.; Darvish, S. R.; Razeghi, M. [Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208 (United States)

2008-07-14T23:59:59.000Z

494

Equivalent circuit-level model and improvement of terahertz quantum cascade lasers  

Science Journals Connector (OSTI)

An equivalent circuit-level model of terahertz (THz) quantum cascade lasers (QCLs) is developed by using rate equations. This model can be employed to investigate the characteristics of THz QCLs accurately and to improve their design. We use the circuit-level model to analyse a new active structure, which can improve the performance of THz QCLs by means of enhancing carrier injection. The simulation result shows that THz QCLs with the new active structure have a much higher performance compared with conventional THz QCLs. The high-performance THz QCLs are expected to be operated at higher temperatures.

Wei Zhou; Shaobin Liu; Jie Wu; Xiaoliu Zhang; Wu Tang

2014-01-01T23:59:59.000Z

495

Period doubling cascade in glow discharges: Local versus global differential conductivity  

Science Journals Connector (OSTI)

Short planar glow discharges coupled to a resistive layer exhibit a wealth of spontaneous spatiotemporal patterns. Due to similarities with other pattern forming systems that are described by reaction-diffusion models, several authors have tried to derive such models from discharge physics. We investigate the temporal oscillations of the discharge system and find a cascade of period doubling events. This shows that the inner structure of the discharge is more complex than can be described by a two-component reaction-diffusion-model with negative differential conductivity. We also derive an alternative reduced model.

Danijela D. ija?i?, Ute Ebert, and Ismail Rafatov

2004-11-23T23:59:59.000Z

496

Bioinspired Approach to Multienzyme Cascade System Construction for Efficient Carbon Dioxide Reduction  

Science Journals Connector (OSTI)

Bioinspired Approach to Multienzyme Cascade System Construction for Efficient Carbon Dioxide Reduction ... In our previous studies, spatially separated enzymatic systems, mimicking natural enzyme organization, were developed by using several kinds of organicinorganic hybrid microcapsules. ... Briefly, immobilized-enzyme-containing solution (1 mL, 50 mM PBS, pH 7.0) was bubbled with CO2 gas for 0.5 h, and then NADH solution (1 mL, 50 mM PBS, pH 7.0) was added to initiate the reaction. ...

Xiaoli Wang; Zheng Li; Jiafu Shi; Hong Wu; Zhongyi Jiang; Wenyan Zhang; Xiaokai Song; Qinghong Ai

2014-02-12T23:59:59.000Z

497

Infrared near-field spectroscopy of trace explosives using an external cavity quantum cascade laser  

SciTech Connect (OSTI)

Utilizing a broadly-tunable external cavity quantum cascade laser for scattering-type scanning near-field optical microscopy (s-SNOM), we measure infrared spectra of explosives particles by probing characteristic nitro-group resonances in the 7.1-7.9 m wavelength range. Measurements are presented with spectral resolution of 0.25 cm-1, spatial resolution of 25 nm, <100 attomolar sensitivity, and at a rapid acquisition time of 90 s per spectrum. We demonstrate high reproducibility of the acquired s-SNOM spectra with very high signal-to-noise ratios and relative noise of <0.02 in self-homodyne detection.

Craig, Ian M.; Taubman, Matthew S.; Lea, Alan S.; Phillips, Mark C.; Josberger, Erik E.; Raschke, Markus Bernd

2013-12-16T23:59:59.000Z

498

Hyperspectral Microscopy of Explosives Particles Using an External Cavity Quantum Cascade Laser  

SciTech Connect (OSTI)

Using infrared hyperspectral imaging, we demonstrate microscopy of small particles of the explosives compounds RDX, tetryl, and PETN with near diffraction-limited performance. The custom microscope apparatus includes an external cavity quantum cascade laser illuminator scanned over its tuning range of 9.13-10.53 m in four seconds, coupled with a microbolometer focal plane array to record infrared transmission images. We use the hyperspectral microscopy technique to study the infrared absorption spectra of individual explosives particles, and demonstrate sub-nanogram detection limits.

Phillips, Mark C.; Bernacki, Bruce E.

2012-12-26T23:59:59.000Z

499

Cascade | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of formation yields a model with quantitative agreement for the benchmark minerals brucite, magnesite, nesquehonite, and hydromagnesite. The model shows how small differences...