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We encourage you to perform a real-time search of NLEBeta
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1

Blue Dots Team Transits Working Group Review  

E-Print Network [OSTI]

Transiting planet systems offer an unique opportunity to observationally constrain proposed models of the interiors (radius, composition) and atmospheres (chemistry, dynamics) of extrasolar planets. The spectacular successes of ground-based transit surveys (more than 60 transiting systems known to-date) and the host of multi-wavelength, spectro-photometric follow-up studies, carried out in particular by HST and Spitzer, have paved the way to the next generation of transit search projects, which are currently ongoing (CoRoT, Kepler), or planned. The possibility of detecting and characterizing transiting Earth-sized planets in the habitable zone of their parent stars appears tantalizingly close. In this contribution we briefly review the power of the transit technique for characterization of extrasolar planets, summarize the state of the art of both ground-based and space-borne transit search programs, and illustrate how the science of planetary transits fits within the Blue Dots perspective.

Sozzetti, A; Alonso, R; Blank, D L; Catala, C; Deeg, H; Grenfell, J L; Hellier, C; Latham, D W; Minniti, D; Pont, F; Rauer, H

2009-01-01T23:59:59.000Z

2

Study of valence-band intersublevel transitions in InAs/GaAs quantum dots-in-well infrared photodetectors  

SciTech Connect (OSTI)

The n-type quantum dot (QD) and dots-in-well (DWELL) infrared photodetectors, in general, display bias-dependent multiple-band response as a result of optical transitions between different quantum levels. Here, we present a unique characteristic of the p-type hole response, a well-preserved spectral profile, due to the much reduced tunneling probability of holes compared to electrons. This feature remains in a DWELL detector, with the dominant transition contributing to the response occurring between the QD ground state and the quantum-well states. The bias-independent response will benefit applications where single-color detection is desired and also allows achieving optimum performance by optimizing the bias.

Lao, Yan-Feng; Wolde, Seyoum; Unil Perera, A. G., E-mail: uperera@gsu.edu [Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303 (United States); Zhang, Y. H.; Wang, T. M. [Key Laboratory of Artificial Structures and Quantum Control, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China); Kim, J. O.; Schuler-Sandy, Ted; Tian, Zhao-Bing; Krishna, S. S. [Center for High Technology Materials, Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, New Mexico 87106 (United States)

2014-04-28T23:59:59.000Z

3

Theoretical study of intraband optical transitions in conduction band of dot-in-a-well system  

SciTech Connect (OSTI)

We study numerically absorption optical spectra of n-doped InAs/In{sub 015}Ga{sub 085}As/GaAs quantum dot-in-a-well systems. The absorption spectra are mainly determined by the size of a quantum dot and have weak dependence on the thickness of quantum well and position of the dot in a well. The dot-in-a-well system is sensitive to both in-plane and out-of-plane polarizations of the incident light with much stronger absorption intensities for the in-plane-polarized light. The absorption spectrum of in-plane-polarized light has also a multi-peak structure with two or three peaks of comparable intensities, while the absorption spectrum of out-of-plane polarized light has a single well-pronounced peak.

Chaganti, Venkata R.; Apalkov, Vadym [Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30302 USA. (Georgia)] [Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30302 USA. (Georgia)

2014-02-15T23:59:59.000Z

4

Gray-030812 - Argonne National Laboratories, Materials Sicence Division  

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

Gray-030812 Gray-030812 MATERIALS SCIENCE COLLOQUIUM SPEAKER: Dr. Stephen K. Gray Center for Nanoscale Materials (CNM) Argonne National Laboratory TITLE: "Quantum Dot - Surface Plasmon Interactions" DATE: Thursday, March 8, 2012 TIME: 11:00 a.m. PLACE: Building 212 / A-157 HOST: TBA Refreshments will be served at 10:45 a.m. ABSTRACT: I discuss theoretical predictions of how quantum dots (QDs) interact with plasmonic systems (e.g. metal nanoparticles). The QD is treated either as a dipole emitter, as an effective, polarizable medium, or with a quantum mechanical density matrix approach. The combined system is modeled with computational electrodynamics. The presence of the quantum dot can significantly alter the optical response of the system. I show how the

5

The effects of wetting layer on electronic and optical properties of intersubband P-to-S transitions in strained dome-shaped InAs/GaAs quantum dots  

SciTech Connect (OSTI)

The authors report on the impact of wetting layer thickness and quantum dot size on the electronic and optical properties of dome-shaped InAs/GaAs quantum dots (QDs) with strained potential. Two wetting layer thicknesses of 0.5 and 2.0 nm were compared. A strong size dependence of P-to-S transition energy, transition dipole moment, oscillator strength, and linear and third-order nonlinear susceptibilities were concluded. The P-to-S transition dipole moment was shown to be purely in-plane polarization. The linear and nonlinear absorption and dispersion showed a red shift when the wetting layer thickness was increased. Our results revealed that the nonlinear susceptibility is much more sensitive to QD size compared to the linear susceptibility. An interpretation of the results was presented based on the probability density of finding the electron inside the dot and wetting layer. The results are in good agreement with previously reported experimental data.

Shahzadeh, Mohammadreza; Sabaeian, Mohammad, E-mail: sabaeian@scu.ac.ir [Physics Department, Faculty of Science, Shahid Chamran University of Ahvaz (Iran, Islamic Republic of)

2014-06-15T23:59:59.000Z

6

Magnetism in strained graphene dots  

Science Journals Connector (OSTI)

We study the magnetization of square and hexagonal graphene dots. It is shown that two classes of hexagonal dots have a second-order phase transition at a critical Hubbard energy U, whose value is similar to the one in bulk graphene, albeit the dots do not have a density of states proportional to the absolute value of the energy, relatively to the Dirac point. Furthermore, we show that a particular class of hexagonal dots, having zigzag edges, does not exhibit zero-energy edge states. We also study the effect of uniaxial strain on the evolution of the magnetization of square dots and find that the overall effect is an enhancement of magnetization with strain. The enhancement can be as large as 100% for strain on the order of 20%. Additionally, stress induces a spatial displacement of the magnetization over the dot, moving it from the zigzag to the armchair edges.

J. Viana-Gomes; Vitor M. Pereira; N. M. R. Peres

2009-12-29T23:59:59.000Z

7

Advanced gray rod control assembly  

DOE Patents [OSTI]

An advanced gray rod control assembly (GRCA) for a nuclear reactor. The GRCA provides controlled insertion of gray rod assemblies into the reactor, thereby controlling the rate of power produced by the reactor and providing reactivity control at full power. Each gray rod assembly includes an elongated tubular member, a primary neutron-absorber disposed within the tubular member said neutron-absorber comprising an absorber material, preferably tungsten, having a 2200 m/s neutron absorption microscopic capture cross-section of from 10 to 30 barns. An internal support tube can be positioned between the primary absorber and the tubular member as a secondary absorber to enhance neutron absorption, absorber depletion, assembly weight, and assembly heat transfer characteristics.

Drudy, Keith J; Carlson, William R; Conner, Michael E; Goldenfield, Mark; Hone, Michael J; Long, Jr., Carroll J; Parkinson, Jerod; Pomirleanu, Radu O

2013-09-17T23:59:59.000Z

8

Placement Testing with Justin Gray  

E-Print Network [OSTI]

Placement Testing with LON-CAPA Justin Gray Dept. of Mathematics SFU #12;Problem Develop reliable placement tests for students who wish to challenge prerequisites for calculus (Calculus Readiness Test) and other quantitative courses (Q Placement Test). #12;Stages Selecting an assessment system Developing

9

NREL: Energy Analysis - Pamela Gray-Hann  

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

E-mail: pamela.gray.hann@nrel.gov Areas of expertise Internet map server applications GIS web page PVWatts Outreach Meeting planning Project support Education and background...

10

Healthcare Energy: Massachusetts General Hospital Gray Building  

Broader source: Energy.gov [DOE]

The Building Technologies Office conducted a healthcare energy end-use monitoring project in partnership with two hospitals. This page contains highlights from monitoring at the Gray Building at Massachusetts General Hospital.

11

Grays Harbor Demonstration Project | Open Energy Information  

Open Energy Info (EERE)

Demonstration Project Demonstration Project Jump to: navigation, search Name Grays Harbor Demonstration Project Facility Grays Harbor Demonstration Project Sector Wind energy Facility Type Offshore Wind Facility Status Proposed Owner Grays Harbor Ocean Energy Company LLC Developer Grays Harbor Ocean Energy Company LLC Location Pacific Ocean Coordinates 46.858°, -124.187° 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":46.858,"lon":-124.187,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

12

George T. "Rusty" Gray named TMS Fellow  

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

George T. "Rusty" Gray III of the Lab's Materials Science in Radiation and Dynamics Extremes group has been named a 2013 Fellow by the Minerals, Metals and Materials Society...

13

Gray County Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Gray County Wind Farm Gray County Wind Farm Jump to: navigation, search Name Gray County Wind Farm Facility Gray County Wind Farm Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner NextEra Energy Resources Developer NextEra Energy Resources Energy Purchaser Aquila Location Gray County KS Coordinates 37.5855°, -100.384° 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":37.5855,"lon":-100.384,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

14

Effect of carrier dynamics and temperature on two-state lasing in semiconductor quantum dot lasers  

SciTech Connect (OSTI)

It is analytically shown that the both the charge carrier dynamics in quantum dots and their capture into the quantum dots from the matrix material have a significant effect on two-state lasing phenomenon in quantum dot lasers. In particular, the consideration of desynchronization in electron and hole capture into quantum dots allows one to describe the quenching of ground-state lasing observed at high injection currents both qualitatevely and quantitatively. At the same time, an analysis of the charge carrier dynamics in a single quantum dot allowed us to describe the temperature dependences of the emission power via the ground- and excited-state optical transitions of quantum dots.

Korenev, V. V., E-mail: korenev@spbau.ru; Savelyev, A. V.; Zhukov, A. E.; Omelchenko, A. V.; Maximov, M. V. [Saint Petersburg Academic University-Nanotechnology Research and Education Center (Russian Federation)] [Saint Petersburg Academic University-Nanotechnology Research and Education Center (Russian Federation)

2013-10-15T23:59:59.000Z

15

Corporate Gray Military Officer Job Fair | Department of Energy  

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

Corporate Gray Military Officer Job Fair Corporate Gray Military Officer Job Fair September 11, 2014 8:00AM to 1:30PM EDT Location: 6715 Commerce Street, Springfield, VA 22150 POC:...

16

Success Stories: Quantum Dots  

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

Quantum Dots Outshine the Competition for Biomedical Assays Quantum Dots Outshine the Competition for Biomedical Assays Quantum Dots (Qdots), nano-scale semiconductor crystals that emit a range of bright colors when excited by a light source such as a laser, are shining brightly these days. The Berkeley Lab developed technology has been licensed by Quantum Dot Corporation and is being used as fluorescence probes for biomedical assays. The technology just won an R & D 100 Award and Quantum Dot Corporation was named by Fortune magazine as one of 2004's "Cool Companies." Science honored the technology as one of the Top 10 Breakthroughs of the Year in 2003, and Nanotechnology Now named Quantum Dots as the Best Nanotech Product in 2003, among other honors. Quantum Dot Corporation (QDC) is a 1998 start-up biotechnology company

17

Gray, Maine: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Gray, Maine: Energy Resources Gray, Maine: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 43.885632°, -70.3317195° 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":43.885632,"lon":-70.3317195,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

18

Gray disks in perturbative Reggeon calculus  

Science Journals Connector (OSTI)

We discuss the connection between the opacity of a gray disk and its diffraction-dissociation cross section in the multichannel eikonal model which is formulated in such a way as to take account of continuum intermediate states of the projectile. The model is equivalent to Reggeon calculated to a finite order in the triple-Pomeron coupling and where the bare-Pomeron intercept exceeds unity.

G. A. Winbow

1977-07-15T23:59:59.000Z

19

Quantum dot device tunable from single to triple dot system  

SciTech Connect (OSTI)

We present a lateral quantum dot device which has a tunable number of quantum dots. Depending on easily tunable gate voltages, one, two or three quantum dots are found. They are investigated in transport and charge detection.

Rogge, M. C.; Haug, R. J. [Institut fr Festkrperphysik, Leibniz Universitt Hannover, Appelstrasse 2, 30167 Hannover (Germany); Pierz, K. [Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig (Germany)

2013-12-04T23:59:59.000Z

20

Dot Density Maps Dot density maps, or dot maps, portray the geographic distribution of discrete phenomena  

E-Print Network [OSTI]

Dot Density Maps Dot density maps, or dot maps, portray the geographic distribution of discrete for representing geographic patterns. Dot density maps are particularly useful for understanding global distribution of the mapped phenomenon and comparing relative densities of different regions on the map. Dot

Klippel, Alexander

Note: This page contains sample records for the topic "gray dots transitioning" 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

Numerical simulation of optical feedback on a quantum dot lasers  

SciTech Connect (OSTI)

We use multi-population rate equations model to study feedback oscillations in the quantum dot laser. This model takes into account all peculiar characteristics in the quantum dots such as inhomogeneous broadening of the gain spectrum, the presence of the excited states on the quantum dot and the non-confined states due to the presence of wetting layer and the barrier. The contribution of quantum dot groups, which cannot follow by other models, is simulated. The results obtained from this model show the feedback oscillations, the periodic oscillations which evolves to chaos at higher injection current of higher feedback levels. The frequency fluctuation is attributed mainly to wetting layer with a considerable contribution from excited states. The simulation shows that is must be not using simple rate equation models to express quantum dots working at excited state transition.

Al-Khursan, Amin H., E-mail: ameen_2all@yahoo.com [Thi-Qar University, Nassiriya Nanotechnology Research Laboratory (NNRL), Science College (Iraq); Ghalib, Basim Abdullattif [Babylon University, Laser Physics Department, Science College for Women (Iraq); Al-Obaidi, Sabri J. [Al-Mustansiriyah University, Physics Department, Science College (Iraq)

2012-02-15T23:59:59.000Z

22

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

23

Grays Harbor PUD - Net Metering | Department of Energy  

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

Net Metering Net Metering Grays Harbor PUD - Net Metering < Back Eligibility Commercial Industrial Residential Savings Category Commercial Heating & Cooling Manufacturing Buying & Making Electricity Alternative Fuel Vehicles Hydrogen & Fuel Cells Water Solar Home Weatherization Wind Program Info State District of Columbia Program Type Net Metering Provider Grays Harbor PUD Grays Harbor PUD's net-metering program differs slightly from what is required by Washington state law in that Grays Harbor PUD reimburses customers for net excess generation (NEG), at the end of each year, at 50% of the utility's retail rate. State law allows utilities to require customers to surrender NEG to the utility, without reimbursement, at the end of a 12-month billing cycle. Grays Harbor PUD has voluntarily gone

24

Grays Harbor PUD - Solar Water Heater Rebate | Department of Energy  

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

Grays Harbor PUD - Solar Water Heater Rebate Grays Harbor PUD - Solar Water Heater Rebate Grays Harbor PUD - Solar Water Heater Rebate < Back Eligibility Commercial Industrial Residential Savings Category Heating & Cooling Solar Water Heating Program Info State District of Columbia Program Type Utility Rebate Program Rebate Amount $600 Provider Grays Harbor PUD Since October 2001, Grays Harbor PUD has offered a rebate program for the installation of solar water heaters. Rebates of $600 are available for the installation of solar collectors of 40 square feet or more. Only customers who currently use electricity for hot water are eligible. This rebate is available on a case-by-case basis, so you must contact the utility in order to take advantage of it. Customers may choose a [http://dsireusa.org/incentives/incentive.cfm?Incentive_Code=WA09F&re=1&ee=1

25

Self-assembly of silicide quantum dot arrays on stepped silicon surfaces by reactive epitaxy  

E-Print Network [OSTI]

investigated on the epitaxy and self- organization of laterally nanostructured transition metal TM silicideSelf-assembly of silicide quantum dot arrays on stepped silicon surfaces by reactive epitaxy L to be a flexible and a convenient method for the preparation of dense arrays of Co silicide quantum dots

Ortega, Enrique

26

Absorption and photoluminescence spectroscopy on a single self-assembled charge-tunable quantum dot  

E-Print Network [OSTI]

Absorption and photoluminescence spectroscopy on a single self-assembled charge-tunable quantum dot PL and absorption spectroscopy on the same single self- assembled quantum dot in a charge the corresponding transition in absorption. We have developed a model of the Coulomb blockade to account

Ludwig-Maximilians-Universität, München

27

Temperature-Tuning of Near-Infrared Monodisperse Quantum Dot Solids at  

E-Print Network [OSTI]

Temperature-Tuning of Near-Infrared Monodisperse Quantum Dot Solids at 1.5 µm for Controllable Fo is important in a wide-variety of applications, especially in the near-infrared region where applications transfer in large, monodisperse lead sulfide quantum dots with ground-state transitions near 1.5 µm (0.8 e

Hone, James

28

DOT | OpenEI  

Open Energy Info (EERE)

50 50 Varnish cache server Browse Upload data GDR 429 Throttled (bot load) Error 429 Throttled (bot load) Throttled (bot load) Guru Meditation: XID: 2142257150 Varnish cache server DOT Dataset Summary Description The data included in this submission is United States Department of Transportation (DOT) data on rates and revenue statistics up to 1995. The data includes state motor-fuel tax receipts, 1919-1995, state motor fuel taxes and related receipts, 1950-1995, and state and federal motor fuel tax rates, 1919-1995 The data is presented in .xlsx format. Source DOT Date Released Unknown Date Updated Unknown Keywords DOT highway motor vehicles rates revenues Data application/vnd.openxmlformats-officedocument.spreadsheetml.sheet icon State motor-fuel tax receipts, 1919-1995 (xlsx, 13.8 KiB)

29

Certificate Program in Transit Management and Operations Allan Byam, Krystal Oldread, UMass Transit Services  

E-Print Network [OSTI]

Certificate Program in Transit Management and Operations Allan Byam, Krystal Oldread, UMass TransitDOT · Managed by the First Transit Management group · 400 buses, 26.4 million passengers/yr, travel 12 million-level managers ! Leadership APTA, National Transit Institute, Professional Certifications ! Programs for skilled

Massachusetts at Amherst, University of

30

Spectrum of electron-hole states of the Si/Ge structure with Ge quantum dots  

SciTech Connect (OSTI)

The lateral photoconductivity spectra of Si/Ge multilayer structures with Ge quantum dots of various sizes are investigated. We observed optical transition lines between the hole levels of quantum dots and electronic states of Si. This enabled us to construct a detailed energy level diagram of the electron-hole spectrum of the Si/Ge structures. It is shown that the hole levels of Ge quantum dots are successfully described by the 'quantum box' model using the actual sizes of Ge islands. It I found that the position of the longwavelength photosensitivity boundary of Si/Ge structures with Ge quantum dots can be controlled by changing the growth parameters.

Talochkin, A. B., E-mail: tal@thermo.isp.nsc.ru; Chistokhin, I. B., E-mail: igor@thermo.isp.nsc.ru [Russian Academy of Sciences, Institute of Semiconductor Physics, Siberian Branch (Russian Federation)

2011-09-15T23:59:59.000Z

31

Photoconductivity of Si/Ge multilayer structures with Ge quantum dots pseudomorphic to the Si matrix  

SciTech Connect (OSTI)

Longitudinal photoconductivity spectra of Si/Ge multilayer structures with Ge quantum dots grown pseudomorphically to the Si matrix are studied. Lines of optical transitions between hole levels of quantum dots and Si electronic states are observed. This allowed us to construct a detailed energy-level diagram of electron-hole levels of the structure. It is shown that hole levels of pseudomorphic Ge quantum dots are well described by the simplest 'quantum box' model using actual sizes of Ge islands. The possibility of controlling the position of the long-wavelength photosensitivity edge by varying the growth parameters of Si/Ge structures with Ge quantum dots is determined.

Talochkin, A. B., E-mail: tal@thermo.isp.nsc.ru; Chistokhin, I. B. [Russian Academy of Sciences, Rzhanov Institute of Semiconductor Physics, Siberian Branch (Russian Federation)

2011-07-15T23:59:59.000Z

32

A hydraulic model study of the gray reef dam spillway  

E-Print Network [OSTI]

A HYDRAULIC MODEL STUDY OF THE GRAY REEF DAM SPILLWAY A Thesis by ALI AKHTAR QURAISHI Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE January 1961 Major Subject: Civil Engineering A HYDRAULIC MODEL STUDY OF THE GRAY REEF DAM SPILLWAY A Thesis ALI AKHTAR QURAISHI Approved as to style and content by: Chairman of Comm' e Head of the Depa ment January 1961 ACKNOWLEDGMENT...

Quraishi, Ali Akhtar

2012-06-07T23:59:59.000Z

33

dot5301.PDF  

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

Transportation Transportation Office of the Secretary of Transportation SUBJECT: Department of Transportation Programs, Policies, and Procedures Affecting American Indians, Alaska Natives, and Tribes ORDER DOT 5301.1 1. PURPOSE. To ensure that programs, policies, and procedures administered by the Department of Transportation (DOT) are responsive to the needs and concerns of American Indians, Alaska Natives, and tribes. 2. REFERENCES. This list is not all-inclusive but is intended to help in the understanding of this DOT Order. a. Executive Orders and Memoranda: (1) Executive Order 12866, Regulatory Planning and Review (58 Federal Register 51739, October 4, 1993), dated September 30, 1993. (2) Executive Order 12875, Enhancing the Intergovernmental Partnership (58 Federal Register 58093, October 28, 1993), dated October 26, 1993.

34

On 3-gauge transformations, 3-curvatures, and Gray-categories  

SciTech Connect (OSTI)

In the 3-gauge theory, a 3-connection is given by a 1-form A valued in the Lie algebra g, a 2-form B valued in the Lie algebra h, and a 3-form C valued in the Lie algebra l, where (g,h,l) constitutes a differential 2-crossed module. We give the 3-gauge transformations from one 3-connection to another, and show the transformation formulae of the 1-curvature 2-form, the 2-curvature 3-form, and the 3-curvature 4-form. The gauge configurations can be interpreted as smooth Gray-functors between two Gray 3-groupoids: the path 3-groupoid P{sub 3}(X) and the 3-gauge group G{sup L} associated to the 2-crossed module L, whose differential is (g,h,l). The derivatives of Gray-functors are 3-connections, and the derivatives of lax-natural transformations between two such Gray-functors are 3-gauge transformations. We give the 3-dimensional holonomy, the lattice version of the 3-curvature, whose derivative gives the 3-curvature 4-form. The covariance of 3-curvatures easily follows from this construction. This Gray-categorical construction explains why 3-gauge transformations and 3-curvatures have the given forms. The interchanging 3-arrows are responsible for the appearance of terms with the Peiffer commutator (, )

Wang, Wei, E-mail: wwang@zju.edu.cn [Department of Mathematics, Zhejiang University, Zhejiang 310027 (China)] [Department of Mathematics, Zhejiang University, Zhejiang 310027 (China)

2014-04-15T23:59:59.000Z

35

Femtosecond gain and index dynamics in an InAs/InGaAsP quantum dot amplifier  

E-Print Network [OSTI]

Femtosecond gain and index dynamics in an InAs/InGaAsP quantum dot amplifier operating at 1.55 µm and refractive index dynamics of an InAs/InGaAsP self-assembled quantum dot semiconductor optical amplifier (SOA-carrier absorption and stimulated transition processes. ©2006 Optical Society of America OCIS codes: (320

Mojahedi, Mohammad

36

Grays Harbor PUD - Residential Energy Efficiency Rebate Program |  

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

Grays Harbor PUD - Residential Energy Efficiency Rebate Program Grays Harbor PUD - Residential Energy Efficiency Rebate Program Grays Harbor PUD - Residential Energy Efficiency Rebate Program < Back Eligibility Residential Savings Category Home Weatherization Commercial Weatherization Appliances & Electronics Heating & Cooling Construction Commercial Heating & Cooling Design & Remodeling Sealing Your Home Ventilation Heat Pumps Water Heating Windows, Doors, & Skylights Program Info State District of Columbia Program Type Utility Rebate Program Rebate Amount Air Source Heat Pump: $700 Ground-Source Heat Pump: $1,500 Ground Source Heat Pump (with Desuperheater):$1,700 Ductless Mini-Split Heat Pump: $1,500 Duct Testing and Sealing: $400 - $500 Insulation: $0.40 - $0.50/sq ft Windows: $6.00 per square foot Energy Star / NEEM Certified Manufactured Home: $800

37

Microsoft Word - Grays River Chum Supplementation Program.doc  

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

KEC-4 KEC-4 SUBJECT: Environmental Clearance Memorandum J. Baugher Project Manager - KEWL-4 Proposed Action: Gray's River Chum Supplementation Program Fish and Wildlife Project No.: 2008-710-00 Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B1.20 Small-scale activities undertaken to protect, restore, or improve fish and wildlife habitat, fish passage facilities (such as fish ladders or minor diversion channels), or fisheries. Location: Grays River, Pacific County, Washington Proposed by: Bonneville Power Administration (BPA) and the Washington Department of Fish and Wildlife (WDFW) Description of the Proposed Action: Chum salmon in the Grays River have been identified as a primary population targeted to improve to a level that contributes to recovery of the species (LCFRB

38

Grays Harbor PUD - Residential Energy Efficiency Loan Program | Department  

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

Residential Energy Efficiency Loan Program Residential Energy Efficiency Loan Program Grays Harbor PUD - Residential Energy Efficiency Loan Program < Back Eligibility Installer/Contractor Residential Savings Category Home Weatherization Commercial Weatherization Sealing Your Home Ventilation Heating & Cooling Commercial Heating & Cooling Heat Pumps Windows, Doors, & Skylights Maximum Rebate $20,000 Air-Source Heat Pump: $10,000 Ground Source Heat Pump w/Desuperheater: $15,000 Ductless Mini-Split Heat Pump: $8,500 Duct Sealing: $2,500 Insulation: $2 per square foot Windows: $40 per square foot Program Info State District of Columbia Program Type Utility Loan Program Rebate Amount $500 - $20,000 Provider Grays Harbor PUD Grays Harbor PUD works with local lending institutions to provide low-interest loans to customers for energy efficiency projects. A

39

Grays Harbor PUD - Solar Water Heater Loan | Department of Energy  

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

Solar Water Heater Loan Solar Water Heater Loan Grays Harbor PUD - Solar Water Heater Loan < Back Eligibility Residential Savings Category Heating & Cooling Solar Water Heating Maximum Rebate not specified Program Info State District of Columbia Program Type Utility Loan Program Rebate Amount not specified Provider Grays Harbor PUD Since October 2001, Grays Harbor PUD has offered a low-interest loan program (currently 4.0%) for the installation of solar water heaters. Loans are available for the installation of solar collectors of 40 square feet or more. The loans are provided through local lenders, with interest subsidized by the PUD. Only customers who currently use electricity for hot water are eligible. Pre-approval is required for this loan and loan amounts are determined on a case-by-case basis.

40

Grays Harbor PUD - Non-Residential Energy Efficiency Rebate Program |  

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

Grays Harbor PUD - Non-Residential Energy Efficiency Rebate Program Grays Harbor PUD - Non-Residential Energy Efficiency Rebate Program Grays Harbor PUD - Non-Residential Energy Efficiency Rebate Program < Back Eligibility Agricultural Commercial Industrial Institutional Local Government Schools Savings Category Heating & Cooling Commercial Heating & Cooling Cooling Other Heat Pumps Appliances & Electronics Commercial Lighting Lighting Manufacturing Maximum Rebate Verifiable Savings: up to 70% of project cost Heat Pumps/Air Conditioners: 50% of actual project cost Economizers: 50% of actual economizer system installed cost Program Info State District of Columbia Program Type Utility Rebate Program Rebate Amount Verifiable Savings: $0.17/kWh, based upon annual kilowatt-hours saved Heat Pumps/Air Conditioners: $200 per ton X minimum or actual SEER

Note: This page contains sample records for the topic "gray dots transitioning" 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

PUD No 1 of Grays Harbor Cnty | Open Energy Information  

Open Energy Info (EERE)

Grays Harbor Cnty Grays Harbor Cnty Jump to: navigation, search Name PUD No 1 of Grays Harbor Cnty Place Washington Utility Id 7548 Utility Location Yes Ownership P NERC Location WECC NERC WECC Yes Operates Generating Plant Yes Activity Distribution Yes Activity Wholesale Marketing Yes Activity Retail Marketing 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 INDUSTRIAL CUSTOMERS WITH GENERATION USED TO SERVE LOAD Schedule 96.3 Industrial Service Rate Schedule 84 Industrial Industrial Service Rate Schedule 84 B Commercial Irrigation Schedule 94 Commercial LARGE GENERAL SERVICE RATE 1 Industrial

42

A comparison between semi-spheroid- and dome-shaped quantum dots coupled to wetting layer  

SciTech Connect (OSTI)

During the epitaxial growth method, self-assembled semi-spheroid-shaped quantum dots (QDs) are formed on the wetting layer (WL). However for sake of simplicity, researchers sometimes assume semi-spheroid-shaped QDs to be dome-shaped (hemisphere). In this work, a detailed and comprehensive study on the difference between electronic and transition properties of dome- and semi-spheroid-shaped quantum dots is presented. We will explain why the P-to-S intersubband transition behaves the way it does. The calculated results for intersubband P-to-S transition properties of quantum dots show two different trends for dome-shaped and semi-spheroid-shaped quantum dots. The results are interpreted using the probability of finding electron inside the dome/spheroid region, with emphasis on the effects of wetting layer. It is shown that dome-shaped and semi-spheroid-shaped quantum dots feature different electronic and transition properties, arising from the difference in lateral dimensions between dome- and semi-spheroid-shaped QDs. Moreover, an analogy is presented between the bound S-states in the quantum dots and a simple 3D quantum mechanical particle in a box, and effective sizes are calculated. The results of this work will benefit researchers to present more realistic models of coupled QD/WL systems and explain their properties more precisely.

Shahzadeh, Mohammadreza; Sabaeian, Mohammad, E-mail: Sabaeian@scu.ac.ir [Physics Department, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, 61357-43135 (Iran, Islamic Republic of)

2014-06-15T23:59:59.000Z

43

Quantum Dots in Graphene  

Science Journals Connector (OSTI)

We suggest a way of confining quasiparticles by an external potential in a small region of a graphene strip. Transversal electron motion plays a crucial role in this confinement. Properties of thus obtained graphene quantum dots are investigated theoretically for different types of the boundary conditions at the edges of the strip. The (quasi)bound states exist in all systems considered. At the same time, the dependence of the conductance on the gate voltage carries information about the shape of the edges.

P. G. Silvestrov and K. B. Efetov

2007-01-03T23:59:59.000Z

44

A Mechanism for Detecting Gray Hole Attacks on Synchrophasor Data  

E-Print Network [OSTI]

in smart grids [1]. Phasor measurement unit (PMU) or synchrophasor data serves to facilitate a number. This paper addresses the problem of securing PMU data against packet dropping or gray hole attacks in the network on PMU data can easily lead to the loss of observability of the system and render useless a number

Sikdar, Biplab

45

Shiny quantum dots brighten future of solar cells  

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

Shiny quantum dots brighten future of solar cells Shiny quantum dots brighten future of solar cells The project demonstrates that superior light-emitting properties of quantum dots...

46

Grays Harbor County, Washington: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Grays Harbor County, Washington: Energy Resources Grays Harbor County, Washington: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 46.9953526°, -123.7012468° 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":46.9953526,"lon":-123.7012468,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

47

Reproductive response of gray and fox squirrels to intensive harvesting  

E-Print Network [OSTI]

for the changes observed. Mast production indices indicated a poor acorn crop during the fall that experimental hunting pressure treatments began, implying that both species of squirrels responded more strongly to mast production than to intensive hunting... 15, 648 in 1957 to 7, 564 in 1958. Mosby ( 1969) compared life tables of 2 woodlot populations of gray squirrels in Virginia, only l of which was hunted. The average rate of exploitation in the hunted study area was 37. 4& of the fall population...

Davis, Charles Edward

2012-06-07T23:59:59.000Z

48

23. Gray{Scott equations Patterns are everywhere in nature. Examples include spots on butter ies, stripes on zebras, tri-  

E-Print Network [OSTI]

23. Gray{Scott equations Patterns are everywhere in nature. Examples include spots on butter ies variety. The Gray{Scott equations were formulated originally by Gray and Scott in 1983; we shall advantage of this principle. References P. Gray and S. K. Scott, papers in Chem. Eng. Sci. 38 (1983), 29

Trefethen, Nick

49

CNM Highlight: Quantum Dot-Induced Transparency  

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

Quantum Dot-Induced Transparency Quantum Dot-Induced Transparency Using rigorous and realistic numerical simulations, staff in the Nanophotonics and Theory and Modeling groups have recently demonstrated that a single semiconductor nanocrystal, or quantum dot, can cancel the scattering and absorption by a much larger metal nanostructure. Placing a quantum dot near a metal is known to strongly modify the rate at which the dot emits light. If the interaction between the dot and the metal is strong enough, scattering and absorption by the metal can be nearly eliminated at the quantum-dot resonance frequency, according to the simulations. This occurs even though the dot by itself simply absorbs light, and even though this absorption is nearly 100,000 times smaller than absorption by the metal nanostructure.

50

Thick-Shell Nanocrystal Quantum Dots  

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

Thick-Shell Nanocrystal Quantum Dots Thick-Shell Nanocrystal Quantum Dots Thick-Shell Nanocrystal Quantum Dots Colloidal nanocrystal quantum dots comprising an inner core having an average diameter of at least 1.5 nm and an outer shell, where said outer shell comprises multiple monolayers, wherein at least 30% of the quantum dots have an on-time fraction of 0.80 or greater under continuous excitation conditions for a period of time of at least 10 minutes. Available for thumbnail of Feynman Center (505) 665-9090 Email Thick-Shell Nanocrystal Quantum Dots Colloidal nanocrystal quantum dots comprising an inner core having an average diameter of at least 1.5 nm and an outer shell, where said outer shell comprises multiple monolayers, wherein at least 30% of the quantum dots have an on-time fraction of 0.80 or greater under continuous

51

All inorganic colloidal quantum dot LEDs  

E-Print Network [OSTI]

This thesis presents the first colloidal quantum dot light emitting devices (QD-LEDs) with metal oxide charge transport layers. Colloidally synthesized quantum dots (QDs) have shown promise as the active material in ...

Wood, Vanessa Claire

2007-01-01T23:59:59.000Z

52

Kenneth Gray - Argonne National Laboratories, Materials Sicence Division  

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

EM > Kenneth Gray EM > Kenneth Gray Kenneth Gray Group Leader, Sr. Physicist Bldg. 223, A-125 Phone: 630-252-9595 This e-mail address is being protected from spambots. You need JavaScript enabled to view it. Biography Kenneth E. Gray is a Senior Scientist in the Materials Science Division. His experimental thesis involved tunneling studies of superconductors and non-equilibrium effects. He joined Argonne's superconductivity group as a post-doc, and in 1972 became a staff member specializing in non-equilibrium effects in superconductors. He is presently the group leader of the Emerging Materials Group. He was the Director for the NATO Advanced Study Institute "Nonequilibrium Superconductivity, Phonons and Kapitza Boundaries" Maratea, Italy, August 25-September 5, 1980 and Chairman of the "1992 Applied Superconductivity Conference" Chicago, Illinois, August 23-28, 1992. He was the Thin Film Research Area Coordinator for the NSF Science and Technology Center for Superconductivity (University of Illinois, Urbana), Feb. 1989-Jan. 1992. He edited Nonequilibrium Superconductivity, Phonons and Kapitza Boundaries, (Plenum Publishing Corporation, 1981). He holds 5 patents, and Research and Development Magazine recognized two of his inventions as among the 100 most significant technical products of their year. These are the Superconducting Tunnel Junction Transistor in 1979 and the 3He/4He Dilution Refrigerator (with P. Roach) in 1988. He received the 1989 Significant Implication for Department of Energy Related Technologies in Solid State Physics - "Thin-Film Superconducting Device Concepts and Development". He has co-authored 250 publications (5300 citations) and is known for research collaborations on flux dynamics and point-contact tunneling in high-temperature superconductors and transport measurements in the highly anisotropic colossal magnetoresistive layered manganites. He is a Senior Scientist and the Group Leader for the Emerging Materials Group at Argonne. His current research interests include tunneling in exotic superconductors, phase diagrams of layered manganites and non-equilibrium effects in complex electronic oxides. He was also an integral part of the recent development of a compact solid-state source for THz radiation.

53

Based on Gray Comprehensive Evaluation Method of Real Estate  

Science Journals Connector (OSTI)

With China's rapid economic development, real estate market is changing from seller market to buyer market; residential development projects are also facing increasing challenges. To make real estate development companies healthy and sustainable in this economic environment and not waste of resources; companies must understand the customer needs. This paper uses gray comprehensive evaluation to find the most popular residential customers of its analysis from the perspective of the customer. The purpose of the paper is make developers give full consideration to the needs of customers to enhancing their own competitiveness.

Xiaojun Liu; Beibei Chen

2011-01-01T23:59:59.000Z

54

Fracture toughness studies of gray and ductile cast irons using a J-integral approach  

E-Print Network [OSTI]

, and silicon in which more carbon is present than can be retained in solid solution in austenite at the eutectic temperature. In gray cast iron, the iron and carbon solidify as a eutectic structure whose two phases are graphite and iron. Gray iron usually... contains from 1. 7 to 4. 5% carbon and 1 to 3% silicon. 27 The normal microstructure of gray iron is a matrix of pearlite (ferrite and cementite) with the graphite flakes dispersed throughout. Among the properties that the flake graphite 28 in gray...

Floyd, Donna Lynne Woodall

2012-06-07T23:59:59.000Z

55

Synthesis, Characterization and Application Of PbS Quantum Dots  

SciTech Connect (OSTI)

Lead Chalcogenides (PbS, PbSe, PbTe) quantum dots (QDs) are ideal for fundamental studies of strongly quantum confined systems with possible technological applications. Tunable electronic transitions at near--infrared wavelengths can be obtained with these QDs. Applications of lead chalcogenides encompass quite a good number of important field viz. the fields of telecommunications, medical electronics, optoelectronics etc. Very recently, it has been proposed that 'memristor'(Memory resistor) can be realized in nanoscale systems with coupled ionic and electronic transports. The hystersis characteristics of 'memristor' are observed in many nanoscale electronic devices including semiconductor quantum dot devices. This paper reports synthesis of PbS QDs by chemical route. The fabricated samples are characterized by UV-Vis, XRD, SEM, TEM, EDS, etc. Observed characteristics confirm nano formation. I-V characteristics of the sample are studied for investigating their applications as 'memristor'.

Sarma, Sweety; Datta, Pranayee [Department of Electronics Science, Gauhati University, Gnwahait-781014, Assam (India); Barua, Kishore Kr. [Department of Physics, Central University, Tezpur-784028, Assam (India); Karmakar, Sanjib [Department of Instrumentation and USIC, Gauhati University, Guwahati-781014, Assam (India)

2009-06-29T23:59:59.000Z

56

Enhanced EP halftones with hexagonal dot packing  

E-Print Network [OSTI]

Enhanced EP halftones with hexagonal dot packing Tomasz J. Cholewo, Steve Weed, Brian Cooper advantages for electropho- tographic (EP) printing over conventional dot placement on a square grid [1] reported that hexagonal dot packing could have some unique benefits for EP printing. These were

Cholewo, Tomasz

57

Grays Harbor Ocean Energy Company | Open Energy Information  

Open Energy Info (EERE)

Ocean Energy Company Ocean Energy Company Jump to: navigation, search Name Grays Harbor Ocean Energy Company Place Seattle, Washington Zip 98105 Sector Renewable Energy, Wind energy Product Grays Harbor has started a demonstration project for offshore wind/wave renewable power generation in Washington State and has applied for up to 1GW in permits for wave projects around the US. Coordinates 47.60356°, -122.329439° 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":47.60356,"lon":-122.329439,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

58

Self-assembly of triangular quantum dots on (111)A substrates by droplet epitaxy  

SciTech Connect (OSTI)

We report the self-assembly of triangular GaAs quantum dots (QDs) on (111)A substrates using droplet epitaxy. Shape transition from hexagonal to triangular QDs is observed with increasing crystallizing temperature. The mechanism of the morphological change is discussed in terms of different growth rates of step edges on a (111)A substrate.

Jo, M.; Mano, T.; Abbarchi, M.; Kuroda, T. [Advanced Photonics Materials Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan); Sakoda, K. [Advanced Photonics Materials Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan and Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 (Japan)

2014-05-15T23:59:59.000Z

59

Project Information Form Project Title Eco-Driving for Transit  

E-Print Network [OSTI]

Provided (by each agency or organization) DOT - $54,871.35 Total Project Cost $54,871.35 Agency IDProject Information Form Project Title Eco-Driving for Transit University Georgia Institute Project Second-by-second data for school buses, MARTA transit buses, and GRTA express buses

California at Davis, University of

60

Optoelectronic devices utilizing materials having enhanced electronic transitions  

DOE Patents [OSTI]

An optoelectronic device that includes a material having enhanced electronic transitions. The electronic transitions are enhanced by mixing electronic states at an interface. The interface may be formed by a nano-well, a nano-dot, or a nano-wire.

Black, Marcie R.

2013-04-09T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

Optoelectronic devices utilizing materials having enhanced electronic transitions  

DOE Patents [OSTI]

An optoelectronic device that includes a material having enhanced electronic transitions. The electronic transitions are enhanced by mixing electronic states at an interface. The interface may be formed by a nano-well, a nano-dot, or a nano-wire.

Black, Marcie R. (Newton, MA)

2011-02-22T23:59:59.000Z

62

Modeling of the quantum dot filling and the dark current of quantum dot infrared photodetectors  

SciTech Connect (OSTI)

A generalized drift-diffusion model for the calculation of both the quantum dot filling profile and the dark current of quantum dot infrared photodetectors is proposed. The confined electrons inside the quantum dots produce a space-charge potential barrier between the two contacts, which controls the quantum dot filling and limits the dark current in the device. The results of the model reasonably agree with a published experimental work. It is found that increasing either the doping level or the temperature results in an exponential increase of the dark current. The quantum dot filling turns out to be nonuniform, with a dot near the contacts containing more electrons than one in the middle of the device where the dot occupation approximately equals the number of doping atoms per dot, which means that quantum dots away from contacts will be nearly unoccupied if the active region is undoped.

Ameen, Tarek A.; El-Batawy, Yasser M.; Abouelsaood, A. A. [Department of Engineering Mathematics and Physics, Faculty of Engineering, Cairo University, Giza (Egypt)

2014-02-14T23:59:59.000Z

63

A `Hot Potato' Gray Code for Permutations Xi Sisi Shen 1,3  

E-Print Network [OSTI]

A `Hot Potato' Gray Code for Permutations Xi Sisi Shen 1,3 Department of Mathematics and Statistics by the chil- dren's game of Hot Potato. Our order is a transposition Gray code, meaning that consecutive) It must transpose value n (the "hot potato"); (2) It must transpose positions that are circularly adjacent

Williams, Aaron

64

All optical gray code to BCD converter e-mail : nkpark@plaza.snu.ac.kr  

E-Print Network [OSTI]

[. 1] / [ 2] / All optical gray code to BCD converter *1) , 2) , 2) , 2) , 1) 1) , 2 to binary-coded-decimal (BCD) converter for the first time in our knowledge utilizing cross gain modulations-level-simplification-method that has been used in electronics, we successfully designed the 4-bit all-optical Gray- code to BCD

Park, Namkyoo

65

Efficient all-optical production of large $^6$Li quantum gases using D$_1$ gray-molasses cooling  

E-Print Network [OSTI]

We use a gray molasses operating on the D$_1$ atomic transition to produce degenerate quantum gases of $^{6}$Li with a large number of atoms. This sub-Doppler cooling phase allows us to lower the initial temperature of 10$^9$ atoms from 500 to 40 $\\mu$K in 2 ms. We observe that D$_1$ cooling remains effective into a high-intensity infrared dipole trap where two-state mixtures are evaporated to reach the degenerate regime. We produce molecular Bose-Einstein condensates of up to 5$\\times$10$^{5}$ molecules and weakly-interacting degenerate Fermi gases of $7\\times$10$^{5}$ atoms at $T/T_{F}<0.1$ with a typical experimental duty cycle of 11 seconds.

A. Burchianti; G. Valtolina; J. A. Seman; E. Pace; M. De Pas; M. Inguscio; M. Zaccanti; G. Roati

2014-06-18T23:59:59.000Z

66

Generation of quantum-dot cluster states with superconducting transmission line resonator  

E-Print Network [OSTI]

We propose an efficient method to generate cluster states in spatially separated double quantum dots with a superconducting transmission line resonator (TLR). When the detuning between the double-dot qubits transition frequency and the frequency of the full wave mode in the TLR satisfies some conditions, an Ising-like operator between arbitrary two separated qubits can be achieved. Even including the main noise sources, it's shown that the high fidelity cluster states could be generated in this solid system in just one step.

Zhi-Rong Lin; Guo-Ping Guo; Tao Tu; Fei-Yun Zhu; Guang-Can Guo

2008-04-20T23:59:59.000Z

67

All-optical 4-bit Gray code to binary coded decimal converter Young Jin Jung*a  

E-Print Network [OSTI]

and Technology / Seoul, Korea, 130-791 ABSTRACT All-optical 4-bit Gray code to binary coded decimal (BCD-level simplification method and Karnaugh map method to design Gray code to BCD converter, general design concept was also founded in this research not only for the Gray code to BCD converter but also for any general

Park, Namkyoo

68

A theoretical analysis of the optical absorption properties in one-dimensional InAs/GaAs quantum dot superlattices  

SciTech Connect (OSTI)

We present theoretical investigations of miniband structures and optical properties of InAs/GaAs one-dimensional quantum dot superlattices (1D-QDSLs). The calculation is based on the multi-band kp theory, including the conduction and valence band mixing effects, the strain effect, and the piezoelectric effect; all three effects have periodic boundary conditions. We find that both the electronic and optical properties of the 1D-QDSLs show unique states which are different from those of well known single quantum dots (QDs) or quantum wires. We predict that the optical absorption spectra of the 1D-QDSLs strongly depend on the inter-dot spacing because of the inter-dot carrier coupling and changing strain states, which strongly influence the conduction and valence band potentials. The inter-miniband transitions form the absorption bands. Those absorption bands can be tuned from almost continuous (closely stacked QD case) to spike-like shape (almost isolated QD case) by changing the inter-dot spacing. The polarization of the lowest absorption peak for the 1D-QDSLs changes from being parallel to the stacking direction to being perpendicular to the stacking direction as the inter-dot spacing increases. In the case of closely stacked QDs, in-plane anisotropy, especially [110] and [11{sup }0] directions also depend on the inter-dot spacing. Our findings and predictions will provide an additional degree of freedom for the design of QD-based optoelectronic devices.

Kotani, Teruhisa, E-mail: kotani.teruhisa@sharp.co.jp [Advanced Technology Research Laboratories, Sharp Corporation, 2613-1 Ichinomoto-cho, Tenri, Nara 632-8567 (Japan); Institute for Nanoelectronics, Technische Universitt Mnchen, Arcisstr. 21, 80333 Munich (Germany); Birner, Stefan [Institute for Nanoelectronics, Technische Universitt Mnchen, Arcisstr. 21, 80333 Munich (Germany); Walter Schottky Institute, Technische Universitt Mnchen, Am Coulombwall 4, 85748 Garching (Germany); Lugli, Paolo [Institute for Nanoelectronics, Technische Universitt Mnchen, Arcisstr. 21, 80333 Munich (Germany); Hamaguchi, Chihiro [Advanced Technology Research Laboratories, Sharp Corporation, 2613-1 Ichinomoto-cho, Tenri, Nara 632-8567 (Japan)

2014-04-14T23:59:59.000Z

69

Women @ Energy: Dot Harris | Department of Energy  

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

Dot Harris Dot Harris Women @ Energy: Dot Harris March 15, 2013 - 1:06pm Addthis LaDoris (Dot) Harris is the Director of the Office of Economic Impact and Diversity. LaDoris (Dot) Harris is the Director of the Office of Economic Impact and Diversity. LaDoris (Dot) Harris is the Director of the Office of Economic Impact and Diversity. She was nominated by President Obama and confirmed by the U.S. Senate on March 29, 2012. She has served at some of the world's largest firms including General Electric, ABB Service, and Westinghouse Electric Company. Ms. Harris leads the Department's efforts to ensure minorities and historically underrepresented communities participate fully in Departmental programs. Ms. Harris oversees funding for minority institutions, advocates for small business contracting opportunities, and

70

Wheat Gray Shorts for the Prevention of Slipped Tendons in Battery Brooder Chicks.  

E-Print Network [OSTI]

of the variations in the percentages of calcium and phosphorus studied. Rations containing 1.90-1.93 percent calcium and .87-.99 percent phosphorus, even though pro- tected by twenty and thirty percent wheat gray shorts, produced more slipped tendons than did... rations containing 1.20-1.62 per- cent cajlcium and ,5647 percent phosphorus. CONTENTS Page Introduction 5 Previous Work 5 Method of Procedure 7 Experimental Results 10 Comparison of no Wheat Gray Shorts with Twenty Percent Wheat Gray Shorts...

Sherwood, R. M. (Ross Madison); Couch, James Russell

1936-01-01T23:59:59.000Z

71

Suppression of Zeeman gradients by nuclear polarization in double quantum dots  

E-Print Network [OSTI]

We use electric dipole spin resonance to measure dynamic nuclear polarization in InAs nanowire quantum dots. The resonance shifts in frequency when the system transitions between metastable high and low current states, indicating the presence of nuclear polarization. We propose that the low and the high current states correspond to different total Zeeman energy gradients between the two quantum dots. In the low current state, dynamic nuclear polarization efficiently compensates the Zeeman gradient due to the $g$-factor mismatch, resulting in a suppressed total Zeeman gradient. We present a theoretical model of electron-nuclear feedback that demonstrates a fixed point in nuclear polarization for nearly equal Zeeman splittings in the two dots and predicts a narrowed hyperfine gradient distribution.

S. M. Frolov; J. Danon; S. Nadj-Perge; K. Zuo; J. W. W. van Tilburg; V. S. Pribiag; J. W. G. van den Berg; E. P. A. M. Bakkers; L. P. Kouwenhoven

2012-09-07T23:59:59.000Z

72

Nanoscale engineering boosts performance of quantum dot light...  

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

engineering boosts performance of quantum dot light emitting diodes Quantum dots are nano-sized semiconductor particles whose emission color can be tuned by simply changing...

73

Temperature-Dependent Electron Transport in Quantum Dot Photovoltaics  

E-Print Network [OSTI]

4.4 Photovoltaics in Practice . . . . . . . . . . . . . .milestones. Quantum dot photovoltaics is in the bottom-rightIN QUANTUM DOT PHOTOVOLTAICS A dissertation submitted in

Padilla, Derek

2013-01-01T23:59:59.000Z

74

Telecommunications Policy Journal, March 2013 Spectrum Sharing in the Gray Space  

E-Print Network [OSTI]

Telecommunications Policy Journal, March 2013 Spectrum Sharing in the Gray Space Jon Peha1 Carnegie, primary-secondary sharing, radar, cellular 1 www.ece.cmu.edu/~peha/bio.html #12;Telecommunications Policy

Peha, Jon M.

75

The enzymatic synthesis of rubber polymer in Parthenium argentatum Gray  

SciTech Connect (OSTI)

Washed rubber particles isolated from stem homogenates of Parthenium argentatum Gray by ultracentrifugation and gel filtration on columns of LKB Ultrogel AcA34 contain rubber transferase which catalyzes the polymerization of isopentenyl pyrophosphate into rubber polymer. The polymerization reaction requires Mg{sup 2+} isopentenyl pyrophosphate, and an allylic pyrophosphate. The K{sub m} values for Mg{sup 2+}, isopentenyl pyrophosphate, and dimethylallyl pyrophosphate were 5.2 {times} 10{sup {minus}4} molar, 8.3 {times} 10{sup {minus}5} molar, and 9.6 {times} 10{sup {minus}5} molar, respectively. The molecular characteristics of the rubber polymer synthesized from ({sup 14}C)isopentenyl pyrophosphate were examined by gel permeation chromatography. The peak molecular weight of the radioactive polymer increased from 70,000 in 15 minutes to 750,000 in 3 hours. The weight average molecular weight of the polymer synthesized over a 3 hour period was 1.17 {times} 10{sup 6} compared to 1.49 {times} 10{sup 6} for the natural rubber polymer extracted from the rubber particles. Over 90% of the in vitro formation of the rubber polymer was de novo from dimethylallyl pyrophosphate and isopentenyl pyrophosphate. Treatment of the washed rubber particles with 3-((3-cholamidopropyl) dimethylammonio) -1-propanesulfonate solubilized the rubber transferase. The solubilized enzyme(s) catalyzed the polymerization of isopentenyl pyrophosphate into rubber polymer with a peak molecular weight of 1 {times} 10{sup 5} after 3 hours of incubation with Mg{sup 2+} and dimethylallyl pyrophosphate. The data support the conclusion that the soluble preparation of rubber transferase is capable of catalyzing the formation of a high molecular weight rubber polymer from an allylic pyrophosphate initiator and isopentenyl pyrophosphate monomer.

Benedict, C.R.; Madhavan, S.; Greenblatt, G.A.; Venkatachalam, K.V.; Foster, M.A. (Texas A M Univ., College Station (USA))

1990-03-01T23:59:59.000Z

76

Generation of three polarization-correlated photons from a single semiconductor quantum dot  

SciTech Connect (OSTI)

We performed polarization-resolved cross-correlation measurements on a radiative cascade of a charged tri-exciton in a single quantum dot. Photoluminescence spectra showed rich peaks arising from the formation of charged excitonic complexes. The energy structure in the cascade transition of a charged tri-exciton was explained by the exchange interaction. By using one transition pathway of the cascade, whose intermediate states form spin-triplet states, we succeeded in generating three polarization-correlated photons with circular polarization.

Arashida, Y.; Ogawa, Y.; Minami, F. [Department of Physics, Tokyo Institute of Technology, Oh-okayama 2-12-1, Tokyo (Japan)

2013-12-04T23:59:59.000Z

77

Mn/DOT County Road Safety Plans  

E-Print Network [OSTI]

Roads Program !! Minnesota Central Safety Funds !! Foster safety culture among county stakeholders 41 Mn/DOT County Road Safety Plans CTS Annual Research Conference April 27 & 28, 2010 Howard Preston & Objectives !! Project Overview !! Schedule, Participating Counties, Approach !! Safety Emphasis Areas

Minnesota, University of

78

Synthesis and characterization of infrared quantum dots  

E-Print Network [OSTI]

This thesis focuses on the development of synthetic methods to create application ready quantum dots (QDs) in the infrared for biological imaging and optoelectronic devices. I concentrated primarily on controlling the size ...

Harris, Daniel Kelly

2014-01-01T23:59:59.000Z

79

AC Transit  

Broader source: Energy.gov [DOE]

AC Transit (or the Alameda-Contra Costa Transit District) is based in Oakland, California, and provides transportation services to the East Bay of San Francisco. The 360-square-mile service area includes 13 cities and adjacent unincorporated areas in Alameda and Contra Costa counties. AC Transit's approximately 638 vehicles serve more than 65 million annual passengers.

80

InAs/GaAs p-type quantum dot infrared photodetector with higher efficiency  

SciTech Connect (OSTI)

An InAs/GaAs quantum dot infrared photodetector (QDIP) based on p-type valence-band intersublevel hole transitions as opposed to conventional electron transitions is reported. Two response bands observed at 1.53 and 310??m are due to transitions from the heavy-hole to spin-orbit split-off QD level and from the heavy-hole to heavy-hole level, respectively. Without employing optimized structures (e.g., the dark current blocking layer), the demonstrated QDIP displays promising characteristics, including a specific detectivity of 1.810{sup 9} cmHz{sup 1/2}/W and a quantum efficiency of 17%, which is about 5% higher than that of present n-type QDIPs. This study shows the promise of utilizing hole transitions for developing QDIPs.

Lao, Yan-Feng; Wolde, Seyoum; Unil Perera, A. G., E-mail: uperera@gsu.edu [Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303 (United States); Zhang, Y. H.; Wang, T. M.; Liu, H. C. [Key Laboratory of Artificial Structures and Quantum Control, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China)] [Key Laboratory of Artificial Structures and Quantum Control, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China); Kim, J. O.; Schuler-Sandy, Ted; Tian, Zhao-Bing; Krishna, S. S. [Center for High Technology Materials, Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, New Mexico 87106 (United States)] [Center for High Technology Materials, Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, New Mexico 87106 (United States)

2013-12-09T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

Polarization-entangled photon generation by a semiconductor quantum dot coupled to a cavity interacting with external fields  

E-Print Network [OSTI]

We theoretically investigate polarization-entangled photon generation by using a semiconductor quantum dot embedded in a microcavity. The entangled states can be produced by the application of two cross-circularly polarized laser fields. The quantum dot nanostructure is considered as a four-level system (ground, two excitons and bi-exciton states) and the theoretical study relies on the dressed states scheme. The quantum correlations, reported in terms of the entanglement of formation, are extensively studied for several values of the important parameters of the quantum dot system as the bi-exciton binding energy, {the decoherence times of the characteristic transitions, the quality factor of the cavity} and the intensities of the applied fields.

Kostas Blekos; Nikos Iliopoulos; Maria-Eftaksia Stasinou; Evaggelos Vlachos; Andreas F. Terzis

2014-04-07T23:59:59.000Z

82

Fast scanning probe for tokamak plasmas J. Boedo, D. Gray, L. Chousal, and R. Conn  

E-Print Network [OSTI]

Fast scanning probe for tokamak plasmas J. Boedo, D. Gray, L. Chousal, and R. Conn Department of tokamaks. The probe described here has five tips which obtain a full spectrum of plasma parameters such as turbulence and anomalous radial particle transport.3 Understanding the tokamak boundary has pro- found

Krstic, Miroslav

83

Modeling a Continuous Dynamic Task Wayne D. Gray, Michael J. Schoelles, & Wai-Tat Fu  

E-Print Network [OSTI]

Modeling a Continuous Dynamic Task Wayne D. Gray, Michael J. Schoelles, & Wai-Tat Fu Human Factors in several ways. Modeling the impact of one such difference raised theoretical issues in motor movement and attention. For motor movement, the issue concerned the functional shape and size of a target

Gray, Wayne

84

2nd Owl Symposium Great Gray Owl ( Strix nebulosa ) Breeding Habitat Use W ithin Alter ed  

E-Print Network [OSTI]

Hole Mountain Range 40 km west of the valley. Wher eas most of the known Great Gray Owl nests habitat in montane for ests in the foothills of the moun- tains that surr ound T eton Valley. This rural of the Island Park cauldera appr oxi- mately 60-80 km north of T eton Valley, and in the foothills of the Big

85

A Generative Approach to Model Interpreter Evolution Jing Zhang, Jeff Gray, and Yuehua Lin  

E-Print Network [OSTI]

to a simulation engine or analysis tool [12]. Generally speaking, a meta- model is relatively stable and seldomA Generative Approach to Model Interpreter Evolution Jing Zhang, Jeff Gray, and Yuehua Lin} @ cis.uab.edu Abstract. Domain-specific modeling techniques are being adopted with more frequency

Gray, Jeffrey G.

86

American Society of Mammalogists Time-Tables in Home Range Usage by Gray Squirrels (Sciurus carolinensis)  

E-Print Network [OSTI]

American Society of Mammalogists Time-Tables in Home Range Usage by Gray Squirrels (Sciurus to Journal of Mammalogy. http://www.jstor.org #12;GENERAL NOTES TIME-TABLESIN HOME RANGE USAGE reportthat free-ranginggray squirrels (Sciurus carolinensis) follow time-tables in usage of their home ranges

Minnesota, University of

87

COGNITIVE METRICS PROFILING Wayne D. Gray, Michael J. Schoelles, & Chris Sims  

E-Print Network [OSTI]

COGNITIVE METRICS PROFILING Wayne D. Gray, Michael J. Schoelles, & Chris Sims Cognitive Science Department Rensselaer Polytechnic Institute [grayw; schoem, simsc] @rpi.edu Cognitive Metrics Profiling promises a new approach to minimizing the cognitive workload of interactive systems. By metering high

Gray, Wayne

88

The gray snapper, Lutjanus griseus, is a moderate-size (to 8 kg) snapper  

E-Print Network [OSTI]

- sachusetts (Sumner et al., 1911), and transforming gray snapper larvae have been caught in ichthyoplankton samples or gear types. Croker (1962), Starck and Schroeder (1970), and Rutherford et al. (1983) conducted between 1986 and 1997.Average annual landings from the south Florida area (Ft. Pierce through the Dry

89

Reply: Lithium and Increased Cortical Gray Matter--More Tissue or More Water?  

E-Print Network [OSTI]

Reply: Lithium and Increased Cortical Gray Matter--More Tissue or More Water? To the Editor: W e cortices, in lithium-treated patients with bipolar disorder, relative to healthy control subjects (1). Dr patients. Although lithium's effects on body water homeostasis (2) are important to consider, the absence

Thompson, Paul

90

Stable spheromak formation by merging in an oblate flux conserver T. Gray,1,a  

E-Print Network [OSTI]

Stable spheromak formation by merging in an oblate flux conserver T. Gray,1,a M. R. Brown,1 C. D; accepted 4 February 2010; published online 29 March 2010 An axisymmetric spheromak formed by the dynamic merging of two smaller spheromaks of the same magnetic helicity in the Swarthmore Spheromak Experiment SSX

Brown, Michael R.

91

Grant Title: MELINDA GRAY ARDIA ENVIRONMENTAL FOUNDATION GRANTS Funding Opportunity Number: N/A  

E-Print Network [OSTI]

Grant Title: MELINDA GRAY ARDIA ENVIRONMENTAL FOUNDATION GRANTS Funding Opportunity Number: N the emphasis and application of basic ecological principles. The Foundation has a grant program called Environmental Curriculum Development Grants. These grants are the Foundation's main program in which one to two

Farritor, Shane

92

A new airfuel WSGGM (weighted sum of gray gas model) for better utility  

E-Print Network [OSTI]

1 A new airfuel WSGGM (weighted sum of gray gas model) for better utility boiler simulation properties. · For each condition: use the validated EWBM to generate emissivity database, spanning a larger). Large emissivity database matrix: 146 discrete values for PL times 101 data points for Tg. · For each

Yin, Chungen

93

Project Plan Field Assessment of the Effectiveness of DiazaConTM on Reducing Gray  

E-Print Network [OSTI]

Project Plan Field Assessment of the Effectiveness of DiazaConTM on Reducing Gray Squirrel that the contraceptive was effective in preventing reproduction in both male and female squirrels. However, the cost of capturing and vaccinating individual EGS with GonaConTM was $15/squirrel and proved to be cost prohibitive

Bolding, M. Chad

94

Matthew J. Gray, Ph.D. College of Agricultural Sciences and  

E-Print Network [OSTI]

Eat?? Pre-Laying WinterPost-Laying Laying 4555 75 25 90 25 75 Life Cycle Events ·Fall Migration Matthew J. Gray University of Tennessee Photo by: R. M. Kaminski #12;3 Moist-soil Wetlands General Moving Water Gravity (reservoirs, rivers) Towable PTO-Pumps Diesel or PTO-Pumps & Wells Electric Pump

Gray, Matthew

95

Full Name: Vicki Gray, PT, PhD Title(s): UMANRRT PostDoctoral Fellow  

E-Print Network [OSTI]

Full Name: Vicki Gray, PT, PhD Title(s): UMANRRT PostDoctoral Fellow Email: vgray and Rehabilitation Sciences in the field of Physical Therapy. Her Ph.D. thesis focused on the motor control of fast continued to work in Dr Jayne Garland's Neural Control of Force Production and Movement Lab

Weber, David J.

96

MEMORY AIDS FOR OLDER PEOPLE Joy Goodman, Steve Brewster, Phil Gray  

E-Print Network [OSTI]

MEMORY AIDS FOR OLDER PEOPLE Joy Goodman, Steve Brewster, Phil Gray Department of Computing Science://www.dcs.gla.ac.uk/utopia ABSTRACT Memory loss and dementia affect a significant number of people. This number is growing as the proportion of older people in developed countries increases. Memory aids can improve the quality of life

Goodman, Joy

97

Management of Wetlands for Wildlife Matthew J. Gray, Heath M. Hagy, J. Andrew Nyman,  

E-Print Network [OSTI]

Chapter 4 Management of Wetlands for Wildlife Matthew J. Gray, Heath M. Hagy, J. Andrew Nyman, and Joshua D. Stafford Abstract Wetlands are highly productive ecosystems that provide habitat for a diversity of wildlife species and afford various ecosystem services. Managing wetlands effectively requires

Wang, Xiaorui "Ray"

98

Wetlands Ecology and Management Instructor: Dr. Matthew Gray (mgray11@utk.edu)  

E-Print Network [OSTI]

WFS 340 Wetlands Ecology and Management Fall 2010 Instructor: Dr. Matthew Gray (mgray11@utk://fwf.ag.utk.edu/mgray/wfs340/340home.htm Recommended Text: Wetlands, 2007, 4th edition (ISBN 978-0-471-69967-5) or Wetlands: To expose students to the basic principles of wetland ecology and management via class lectures, labs

Gray, Matthew

99

Wetlands Ecology and Management Instructor: Dr. Matthew Gray (mgray11@utk.edu)  

E-Print Network [OSTI]

WFS 340 Wetlands Ecology and Management Fall 2011 Instructor: Dr. Matthew Gray (mgray11@utk://fwf.ag.utk.edu/mgray/wfs340/340home.htm Recommended Text: Wetlands, 2007, 4th edition (ISBN 978-0-471-69967-5) or Wetlands: To expose students to the basic principles of wetland ecology and management via class lectures, labs

Gray, Matthew

100

Wetlands Ecology and Management Instructor: Dr. Matthew Gray (mgray11@utk.edu)  

E-Print Network [OSTI]

WFS 340 Wetlands Ecology and Management Fall 2012 Instructor: Dr. Matthew Gray (mgray11@utk://fwf.ag.utk.edu/mgray/wfs340/340home.htm Required Text: Wetland Restoration and Construction, 2011 (978-0-9834558-0-6) Author: Thomas Biebighauser Recommended Text: Wetlands, 2007, 4th edition (ISBN 978-0-471-69967-5) or Wetlands

Gray, Matthew

Note: This page contains sample records for the topic "gray dots transitioning" 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

Chemically graftedChemically grafted nanoparticlesnanoparticles Quantum dot Nanoparticle  

E-Print Network [OSTI]

Chemically graftedChemically grafted nanoparticlesnanoparticles Quantum dot Nanoparticle (~ 5nm Pb atomic force microscope tip: tether nanoparticle to oxide dot, or H-terminated pit after HF etch Ebeam

Plotkin, Steven S.

102

Grays River Watershed Restoration Status Report 2007, May 1, 2007 - October 30, 2008.  

SciTech Connect (OSTI)

The Bonneville Power Administration (BPA) Project 2003-013-00, 'Grays River Watershed Restoration', began in FY04 and continues into FY09. This status report is intended to summarize accomplishments during the period 1 May 2007 through 30 October 2008. Accomplishments are summarized by Work Elements, as detailed in the Statement of Work (see BPA's project management database PISCES). The Pacific Northwest National Laboratory (PNNL) is collaborating with the Columbia River Estuary Task Force (CREST) on implementation of the Grays River Restoration Project. The Grays River is vitally important to the recovery of Lower Columbia River (LCR) chum salmon because it currently has the most viable population remaining in the LCR region. The Grays River watershed is also important to the recovery of salmon and steelhead in the LCR ecosystem. Today, numbers of naturally spawning salmon and steelhead have declined to levels far below historical numbers because of habitat limiting factors that include but are not limited to the lack of habitat connectivity, diversity, channel stability, riparian function and altered stream flow conditions. The objective of this project is to restore habitat-forming processes to enhance salmon and steelhead populations in the Grays River, following recommendations developed during the FY04-06 BPA-sponsored Grays River Watershed Assessment (BPA Project No. 2003-013-00). Specifically, this project will be the first step in restoring channel structure and function that will increase instream habitat diversity, channel stability, and riparian integrity in the critical response reach upstream and adjacent to critical salmon spawning areas of the Grays River. The major component of this strategy is the planning, design, installation, and monitoring of engineered logjams (ELJ) that will rejuvenate historic channel and floodplain processes. Additional restoration measures include reforesting the riparian corridor to enhance future large woody debris recruitment and investigation of conservation activities within ecologically critical areas. These activities include land acquisition and levee removal to protect critical areas and reconnect floodplain areas. Finally, monitoring integrated with restoration activities is proposed to evaluate restoration effectiveness and allow for adaptive management of future restoration treatments in the project area as well as other degraded watersheds in the Lower Columbia River.

Hanrahan, Tim [Pacific Northwest National Laboratory

2008-10-20T23:59:59.000Z

103

Fast quantum dot single photon source triggered at telecommunications wavelength  

E-Print Network [OSTI]

We demonstrate a quantum dot single photon source at 900 nm triggered at 300 MHz by a continuous wave telecommunications wavelength laser followed by an electro-optic modulator. The quantum dot is excited by on-chip-generated second harmonic radiation, resonantly enhanced by a GaAs photonic crystal cavity surrounding the InAs quantum dot. Our result suggests a path toward the realization of telecommunications-wavelength-compatible quantum dot single photon sources with speeds exceeding 1 GHz.

Kelley Rivoire; Sonia Buckley; Arka Majumdar; Hyochul Kim; Pierre Petroff; Jelena Vuckovic

2010-12-01T23:59:59.000Z

104

Double quantum dot as a minimal thermoelectric generator  

Science Journals Connector (OSTI)

Based on numerical renormalization group calculations, we demonstrate that experimentally realized double quantum dots constitute a minimal thermoelectric generator. In the Kondo regime, one quantum dot acts as an n-type and the other one as a p-type thermoelectric device. Properly connected, a capacitively coupled double quantum dot provides a miniature power supply utilizing the thermal energy of the environment.

S. Donsa; S. Andergassen; K. Held

2014-03-05T23:59:59.000Z

105

A hybrid double-dot in silicon  

SciTech Connect (OSTI)

We report electrical measurements of a single arsenic dopant atom in the tunnel barrier of a silicon single-electron transistor (SET). In addition to performing the electrical characterisation of the individual dopants, we study the series electrical transport through the dopant and SET. We measure the bias triangles of this hybrid double-dot and show that we can tune the electrostatic coupling between the two sub-systems. Additionally, we measured SET in which an additional plunger gate allows the reduction of the electron number in the SET down to the few-electron regime where the dot presents well-defined spin configurations. Finally, we discuss the challenges of operating a dopant-dot hybrid system in the few-electron regime.

Gonzalez-Zalba, M. F.; Heiss, D.; Ferguson, A. J. [Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge (United Kingdom)

2013-12-04T23:59:59.000Z

106

Bilayer graphene quantum dot defined by topgates  

SciTech Connect (OSTI)

We investigate the application of nanoscale topgates on exfoliated bilayer graphene to define quantum dot devices. At temperatures below 500 mK, the conductance underneath the grounded gates is suppressed, which we attribute to nearest neighbour hopping and strain-induced piezoelectric fields. The gate-layout can thus be used to define resistive regions by tuning into the corresponding temperature range. We use this method to define a quantum dot structure in bilayer graphene showing Coulomb blockade oscillations consistent with the gate layout.

Mller, Andr; Kaestner, Bernd; Hohls, Frank; Weimann, Thomas; Pierz, Klaus; Schumacher, Hans W., E-mail: hans.w.schumacher@ptb.de [Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig (Germany)

2014-06-21T23:59:59.000Z

107

U.S. DOT Federal Railroad Administration  

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

DOT DOT Federal Railroad Administration U.S. Department of Energy Transportation External Coordination Working Group (TEC) July 24-25, 2007 Kansas City, Missouri Evaluation of Shortline Railroads Tasked for the Transportation of Spent Nuclear Fuel Evaluation of Shortline Railroads  Task:  Identify Shortline Railroads Serving Nuclear Power Plants or Involved in the Transportation Link  Establish Contact Information with Railroads Officials  Field Review of each Railroad's Physical and Operational Infrastructure  Qualify each Railroads Present Operational Status Against a Safe Acceptable Standard  Facilitate Upgrades to Meet Safe Acceptable Standards Evaluation of Shortline Railroads

108

Synthesis of CdSe quantum dots for quantum dot sensitized solar cell  

SciTech Connect (OSTI)

CdSe Quantum Dots (QDs) of size 0.85 nm were synthesized using chemical route. ZnO based Quantum Dot Sensitized Solar Cell (QDSSC) was fabricated using CdSe QDs as sensitizer. The Pre-synthesized QDs were found to be successfully adsorbed on front ZnO electrode and had potential to replace organic dyes in Dye Sensitized Solar Cells (DSSCs). The efficiency of QDSSC was obtained to be 2.06 % at AM 1.5.

Singh, Neetu, E-mail: singh.neetu1985@gmail.com; Kapoor, Avinashi [Department of Electronic Science, University of Delhi South Campus, New Delhi-110 021 (India); Kumar, Vinod [Department of Physics, University of the Free State, Bloemfontein, ZA9300 (South Africa); Mehra, R. M. [School of Engineering and Technology, Sharda University, Greater Noida-201 306, U.P. (India)

2014-04-24T23:59:59.000Z

109

Pulsed-gate measurements of the singlet-triplet relaxation time in a two-electron double quantum dot  

E-Print Network [OSTI]

-gate technique with charge sensing is used to measure the singlet-triplet relaxation time for nearly degenerate spin states in a two-electron double quantum dot. Transitions from the 1,1 charge occupancy state. At dilution refrigerator temperatures, this implies that EZeeman kBT 10 eV, or B 0.5 T. For B 0.5 T, T1 shows

Petta, Jason

110

MHK Projects/Grays Harbor Ocean Energy and Coastal Protection | Open Energy  

Open Energy Info (EERE)

Grays Harbor Ocean Energy and Coastal Protection Grays Harbor Ocean Energy and Coastal Protection < MHK Projects Jump to: navigation, search << Return to the MHK database homepage Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"350px","centre":false,"title":"","label":"","icon":"File:Aquamarine-marker.png","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":47.4651,"lon":-124.367,"alt":0,"address":"","icon":"http:\/\/prod-http-80-800498448.us-east-1.elb.amazonaws.com\/w\/images\/7\/74\/Aquamarine-marker.png","group":"","inlineLabel":"","visitedicon":""}]}

111

Gray theory based energy saving potential evaluation and planning for distribution networks  

Science Journals Connector (OSTI)

Abstract A systematic method is proposed to quantitatively evaluate the energy saving potential (ESP) combining a microscopic analysis and the macro statistics of the distribution network. An energy saving modification (ESM) investment planning model, constrained by the funds available, is developed based on the ESP evaluation method. In the model, the modification investment amount of each measure is set as a variable, and the core parameters including gray correlation coefficient, index inferior degree and loss reduction efficiency are obtained from gray correlation analysis. Given the investment constraints and weighting factors, the problem of energy saving investment allocation of the whole distribution system is solved within the fund constraint. An example shows that the proposed method is ideal for quantifying the loss reduction space and modification demand of distribution systems while improving the efficiency of investment for ESM.

Yong-Jun Zhang; Xi-Tian Zhang; Qin-Hao Li; Li Ran; Ze-Xiang Cai

2014-01-01T23:59:59.000Z

112

The 21st LH Gray Conference (June 4-6, 2008)  

SciTech Connect (OSTI)

The 21st LH Gray Conference, organised by the LH Gray Trust with the Society for Radiological Protection, brought together international experts in radiobiology, epidemiology and risk assessment, and scientists involved in diagnostic and therapeutic radiation exposure. The meeting - held in Edinburgh, Scotland 4?6 June 2008 - aimed to raise awareness, educate and share knowledge of important issues in radiation protection. A distinguished group of speakers discussed topics which included: non-targeted effects of radiation, exposure to high natural background radiation, non-cancer effects in Japanese bomb survivors, lessons learnt from Chernobyl, radiation in the workplace, biokinetic modelling, uncertainties in risk estimation, issues in diagnostic medical exposures, lessons leant from the polonium-210 incidence and how the radiobiology-radiation oncology community is needed to help society prepare for potential future acts of radiation terrorism. The conference highlighted the importance, relevance and topicality of radiobiology today.

West, C.M.L.; Martin, C.J.; Sutton, D.G.; Wright, E.G.

2009-01-12T23:59:59.000Z

113

A Powerful Dot Of Solar Energy  

Science Journals Connector (OSTI)

A Powerful Dot Of Solar Energy ... The ongoing supermassive thermonuclear explosion that powers the sun emits energy at a mind-boggling rate exceeding 100 trillion trillion watts. ... To meet that challenge, scientists have been searching for ways to make low-cost solar cellsphotovoltaic devices that convert light ... ...

MITCH JACOBY

2013-09-23T23:59:59.000Z

114

Enhanced Joule Heating in Umbral Dots  

E-Print Network [OSTI]

We present a study of magnetic profiles of umbral dots (UDs) and its consequences on the Joule heating mechanisms. Hamedivafa (2003) studied Joule heating using vertical component of magnetic field. In this paper UDs magnetic profile has been investigated including the new azimuthal component of magnetic field which might explain the relatively larger enhancement of Joule heating causing more brightness near circumference of UD.

Chandan Joshi; Lokesh Bharti; S. N. A. Jaaffrey

2007-05-08T23:59:59.000Z

115

Double superexchange in quantum dot mesomaterials  

E-Print Network [OSTI]

as the critical obstacles to dramatic enhancements in the energy conversion efficiency of photovoltaic cells based.7­10 A low binding energy allows excitons to thermally dissociate and charge carriers hop from dot exhibits a double superexchange. In addition to enhancing carrier hopping rates, double superexchange plays

Wu, Zhigang

116

Mn/DOT's Project Peer Review  

E-Print Network [OSTI]

Mn/DOT's Project Management Peer Review Creating a Project Management Culture 2010 CTS Research and perspectives ·Peer Review Process and Results ·Construction Industry Perspective ·Next Steps ·Q & A #12;Why a Peer Review? Why Project Management? ·Improve project delivery performance ­ on time, on budget (an

Minnesota, University of

117

Environment of deposition of the upper Jurassic "Gray" sandstones, Terryville field, Lincoln Parish, Louisiana  

E-Print Network [OSTI]

, Lincoln Parish, Louisiana. (May, 1983) Philip Charles Mani, B. A. , Trinity University San Antonio, Texas Chairman of Advisory Committee: Dr. Robert R. Berg The "Gray" sandstones are deep, low permeability, gas-producing reservoirs classified... as feldspathic subli- tharenites (Folk, 1974). Sandstones occur in a section of dominant dark shale that has a total thickness of 600 ft (182 m) . Cores exhibit thin sandstone beds with repetit'ous sequences of sedimentary structures and textural grading...

Mani, Philip Charles

2012-06-07T23:59:59.000Z

118

The effect of different harvest rates on gray and fox squirrel reproduction  

E-Print Network [OSTI]

~ Beasom An evaluation was made on the effects of differential fall and spring hunting pressure on gray squirrel (Sciurus carolinensis) and fox squirrel (S ~?Cer) productivity on two study areas located on the Gus Engeling Wildlife Management Area... in East Texas Two years of base- line data~ ending with the 1974 fall hunt~ were collected from Pastures 19 and 4 during the bi-annual public hunts Prior to the first ex- perimental hunt (1975 spring hunt) in which differential hunting pres- sure...

Smith, Charles Scott

2012-06-07T23:59:59.000Z

119

Population structure of the gray snapper, Lutjanus griseus, in the U.S. waters of the Gulf of Mexico  

E-Print Network [OSTI]

structure of the species. Population structure of gray snapper in the Gulf was assessed via homogeneity testing of allele and genotype distributions at 13 nuclear-encoded microsatellites and a 590 base-pair fragment of mitochondrial DNA. No significant...

Ebelt, Nancy D

2007-08-03T23:59:59.000Z

120

Anomalous decay of photon echo in a quantum dot ensemble in the strong excitation regime  

SciTech Connect (OSTI)

We investigated the coherent dynamics of exciton ground-state transitions in an 150-layer-stacked strain-compensated InAs quantum dot ensemble using photon echo (PE) technique in the strong excitation regime. The time delay dependence of PE signal intensity shows a drastic change depending on the excitation intensity and the aperture position placed in front of a detector. Our results suggest that the excitation-intensity-dependent spatial distribution of PE signal intensity plays an important role in observing PE signal decay in the strong excitation regime.

Suemori, Ryosuke; Ishi-Hayase, Junko [Department of Applied Physics and Physico-Informatics, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522 (Japan); Akahane, Kouichi; Yamamoto, Naokatsu [National Institute of Information and Communications Technology (NICT), 4-2-1, Nukuikitamchi, Koganei, Tokyo 102-8554 (Japan)

2013-12-04T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

Intersublevel dephasing in InAs/GaAs quantum dots below the Reststrahlen band  

SciTech Connect (OSTI)

Using transient four-wave mixing in the terahertz range, we have measured the s-p inter-sublevel dephasing time in self-assembled InAs/GaAs quantum dots for transition energies below the Reststrahlen band. Dephasing times of up to 600?ps at a photon energy of 18?meV have been determined. By comparing pump-probe and four-wave mixing measurements, we show that there is no significant influence of any pure dephasing process at low temperature. The linear temperature dependence is consistent with acoustic phonon scattering.

Teich, M., E-mail: m.teich@hzdr.de; Stephan, D. R.; Helm, M. [Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden (Germany) [Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden (Germany); Technische Universitt Dresden, 01062 Dresden (Germany); Winnerl, S.; Schneider, H. [Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden (Germany)] [Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden (Germany); Wilson, L. R. [Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH (United Kingdom)] [Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH (United Kingdom)

2013-12-16T23:59:59.000Z

122

Detection of single quantum dots in model organisms with sheet illumination microscopy  

SciTech Connect (OSTI)

Single-molecule detection and tracking is important for observing biomolecule interactions in the microenvironment. Here we report selective plane illumination microscopy (SPIM) with single-molecule detection in living organisms, which enables fast imaging and single-molecule tracking and optical penetration beyond 300 {mu}m. We detected single nanocrystals in Drosophila larvae and zebrafish embryo. We also report our first tracking of single quantum dots during zebrafish development, which displays a transition from flow to confined motion prior to the blastula stage. The new SPIM setup represents a new technique, which enables fast single-molecule imaging and tracking in living systems.

Friedrich, Mike; Nozadze, Revaz; Gan, Qiang; Zelman-Femiak, Monika; Ermolayev, Vladimir [Molecular Microscopy Group, Rudolf Virchow Center, University of Wuerzburg, Versbacher Str. 9, D-97078 Wuerzburg (Germany)] [Molecular Microscopy Group, Rudolf Virchow Center, University of Wuerzburg, Versbacher Str. 9, D-97078 Wuerzburg (Germany); Wagner, Toni U. [Institute of Physiological Chemistry I, Biocenter, University of Wuerzburg, Am Hubland, D-97074 Wuerzburg (Germany)] [Institute of Physiological Chemistry I, Biocenter, University of Wuerzburg, Am Hubland, D-97074 Wuerzburg (Germany); Harms, Gregory S., E-mail: gregory.harms@virchow.uni-wuerzburg.de [Molecular Microscopy Group, Rudolf Virchow Center, University of Wuerzburg, Versbacher Str. 9, D-97078 Wuerzburg (Germany)

2009-12-18T23:59:59.000Z

123

Excitonic fine-structure splitting in telecom-wavelength InAs/GaAs quantum dots: Statistical distribution and height-dependence  

SciTech Connect (OSTI)

The variation of the excitonic fine-structure splitting is studied for semiconductor quantum dots under the influence of a strain-reducing layer, utilized to shift the emission wavelength of the excitonic transition into the telecom-wavelength regime of 1.31.5 ?m. By means of a sp{sup 3}s{sup *}-tight-binding model and configuration interaction, we calculate wavelength shifts and fine-structure splittings for various quantum dot geometries. We find the splittings remaining small and even decreasing with strain-reducing layer composition for quantum dots with large height. Combined with an observed increased emission efficiency, the applicability for generation of entanglement photons is persistent.

Goldmann, Elias, E-mail: goldmann@itp.uni-bremen.de; Barthel, Stefan; Florian, Matthias; Jahnke, Frank [Institute of Theoretical Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen (Germany)] [Institute of Theoretical Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen (Germany); Schuh, Kolja [College of Optical Sciences, University of Arizona, 1630 E. University Blvd., Tucson, Arizona 85721-0094 (United States)] [College of Optical Sciences, University of Arizona, 1630 E. University Blvd., Tucson, Arizona 85721-0094 (United States)

2013-12-09T23:59:59.000Z

124

Photonic Crystal and III-N Quantum Dot Lasers  

Science Journals Connector (OSTI)

Deep UV light emitting devices are important for future medical, environmental and IT applications. Generation of DUV light using quantum dots GaN-related materials and nonlinear...

Aoyagi, Yoshinobu; Inoue, Shinichiro; Takeuchi, Misaichi; Kawasaki, Koji; Hirayama, Hideki

125

Feature issue introduction: quantum dots for photonic applications  

Science Journals Connector (OSTI)

Quantum dots (QDs) are semiconductor nanocrystals with peculiar optoelectronic properties. Their wide application in light-emitting diodes, solar cells, and the medical and defense...

Lee, Kwang-Sup; Prasad, Paras N; Huyet, Guillaume; Tan, Chee Hing

2012-01-01T23:59:59.000Z

126

Solution-Processed Solar Cells using Colloidal Quantum Dots ...  

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

of solar cells and light sensors based on solution-processed semiconductors." He is a Fellow of the IEEE "... for contributions to colloidal quantum dot optoelectronic devices."...

127

Microfluidic self-assembly of quantum dot compound micelles.  

E-Print Network [OSTI]

??This thesis is devoted to the development of microfluidic processes for the controlled self-assembly of quantum dot compound micelles (QDCMs). Microfluidic processes are developed to (more)

Schabas, Greg

2007-01-01T23:59:59.000Z

128

Quantum Dot Tracers for Use in Engineered Geothermal  

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

tracers, colloidal quantum dots, that offer great promise for use in characterizing fracture networks in EGS reservoirs. Since the wavelength of fluorescence (color) of these...

129

Quantum Dot Tracers for Use in Engineered Geothermal | Department...  

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

tracerspeer2013.pdf More Documents & Publications Tracer Methods for Characterizing Fracture Stimulation in Engineered Geothermal Systems (EGS) Quantum Dot Tracers for Use in...

130

Quantum Dot Tracers for Use in Engineered Geothermal Systems...  

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

nanoparticles(quantum dots)that offer great promise for use in characterizing fracture networks in EGS reservoirs. tracersrosequantumdot.pdf More Documents &...

131

Quantum dot nanoparticle conjugation, characterization, and applications in neuroscience  

E-Print Network [OSTI]

Characterization of nanoparticle labeling tools for neuralCALIFORNIA, SAN DIEGO Quantum Dot Nanoparticle Conjugation,resulting in aggregation of nanoparticle-antibody conjugates

Pathak, Smita

2008-01-01T23:59:59.000Z

132

Unraveling the mystery of quantum-dot blinking  

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

mystery of quantum-dot blinking Research enhances single particle tracking, allows novel light-emitting diodes, and boosts development of new solar cells. April 3, 2012 Artists...

133

Temperature-Dependent Electron Transport in Quantum Dot Photovoltaics.  

E-Print Network [OSTI]

??Quantum dot photovoltaics have attracted much interest from researchers in recent years. They have the potential to address both costs and efficiencies of solar cells (more)

Padilla, Derek

2013-01-01T23:59:59.000Z

134

Photovoltaic performance of ultra-small PbSe quantum dots  

E-Print Network [OSTI]

Colloidal Quantum Dots for Photovoltaics: Fundamentals andSchottky-Quantum Dot Photovoltaics for Efficient InfraredDJ; Klimov, VI, Hybrid Photovoltaics Based on Semiconductor

Ma, Wanli

2014-01-01T23:59:59.000Z

135

Radiative Decay Engineering of Direct Bandgap Emission in Silver Ion-Implanted Polarized Silicon Quantum Dots  

Science Journals Connector (OSTI)

Emission from low energy Silver ion implanted crystalline silicon quantum dots can be enhanced due to enhanced radiative recombination induced by polarization of the dots and metal...

Singh, Akhilesh; Gryczynski, Karol; Neogi, Arup; Kim, Moon

136

Potential value extraction from TxDOTs right of way and other property assets.  

E-Print Network [OSTI]

??Many Departments of Transportation (DOTs), including Texas Department of Transportation (TxDOT), have been challenged by inadequate funding from traditional federal and state fuel taxes, increasing (more)

Paes, Thiago Mesquita

2012-01-01T23:59:59.000Z

137

Optical levitation of microdroplet containing a single quantum dot  

E-Print Network [OSTI]

Semiconductor nanocrystals, also known as quantum dots (QDs), are key ingredients in current quantum optics experiments. They serve as quantum emitters and memories and have tunable energy levels that depend not only on the material but also, through the quantum confinement effect, on the size. The resulting strongly confined electron and hole wave functions lead to large transition dipole moments, which opens a path to ultra strong coupling and even deep strong coupling between light and matter. Such efficient coupling requires the precise positioning of the QD in an optical cavity with a high quality factor and small mode volume, such as micro-Fabry--Perot cavity, whispering-gallery-mode microcavity, or photonic-crystal cavity. However, the absence of a technique for free-space positioning has limited the further research on QD-based cavity quantum electrodynamics. In this paper, we present a technique to overcome this challenge by demonstrating the optical levitation or trapping in helium gas of a single Q...

Minowa, Yosuke; Ashida, Masaaki

2014-01-01T23:59:59.000Z

138

Quantum Dot Solar Cells: High Efficiency through Multiple Exciton Generation  

SciTech Connect (OSTI)

Impact ionization is a process in which absorbed photons in semiconductors that are at least twice the bandgap can produce multiple electron-hole pairs. For single-bandgap photovoltaic devices, this effect produces greatly enhanced theoretical thermodynamic conversion efficiencies that range from 45-85%, depending upon solar concentration, the cell temperature, and the number of electron-hole pairs produced per photon. For quantum dots (QDs), electron-hole pairs exist as excitons. We have observed astoundingly efficient multiple exciton generation (MEG) in QDs of PbSe (bulk Eg = 0.28 eV), ranging in diameter from 3.9 to 5.7nm (Eg = 0.73, 0.82, and 0.91 eV, respectively). The effective masses of electron and holes are about equal in PbSe, and the onset for efficient MEG occurs at about three times the QD HOMO-LUMO transition (its ''bandgap''). The quantum yield rises quickly after the onset and reaches 300% at 4 x Eg (3.64 eV) for the smallest QD; this means that every QD in the sample produces three electron-hole pairs/photon.

Hanna, M. C.; Ellingson, R. J.; Beard, M.; Yu, P.; Micic, O. I.; Nozik, A. J.; c.

2005-01-01T23:59:59.000Z

139

Washing out of the 0-transition in Josephson junctions R. Avriller1  

E-Print Network [OSTI]

Washing out of the 0- transition in Josephson junctions R. Avriller1 and F. Pistolesi1 1 Univ: July 21, 2014) We consider a Josephson junction formed by a quantum dot connected to two bulk numbers: 73.23.-b, 74.25.F-, 74.50.+r, 74.45.+c Introduction.-- The Josephson junction is a fun- damental

Boyer, Edmond

140

Project Information Form Project Title Innovative Data Collection to Improve Transit Service Assessment  

E-Print Network [OSTI]

(s) and Amounts Provided (by each agency or organization) DOT - $102,971.57 Total Project Cost $102,971.57 AgencyProject Information Form Project Title Innovative Data Collection to Improve Transit Service of Research Project Mobile information technology will be used to compare travel behavior of populations

California at Davis, University of

Note: This page contains sample records for the topic "gray dots transitioning" 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

TRANSITION DE MOTT METAL-INSULATOR TRANSITIONS  

E-Print Network [OSTI]

predominantly non-trivalent ions favor the metallicstate. I. Introduction. -Transition metal oxides form a class that such a transition would be dis- continuous as a function of volume [8], and he later proposed a phase diagramTRANSITION DE MOTT METAL-INSULATOR TRANSITIONS IN TRANSITION METAL OXIDES by D. B. McWHAN, A. MENTH

Paris-Sud XI, Université de

142

Alameda-Contra Costa Transit District (AC Transit) Fuel Cell...  

Energy Savers [EERE]

(AC Transit) Fuel Cell Transit Buses: Preliminary Evaluation Results Alameda-Contra Costa Transit District (AC Transit) Fuel Cell Transit Buses: Preliminary Evaluation Results This...

143

Machinability of clean thin-wall gray and ductile iron castings. Final report  

SciTech Connect (OSTI)

First phase was to develop a laboratory technique for evaluating the machinability of gray and ductile iron; longer term goal is to learn how to modify the foundry process to produce castings meeting all specified mechanical properties while providing improved machining behavior. Microcarbides present in the irons were found to dominate the machinability of iron. Pearlitic irons with acceptable machinability contain 8.9 to 10.5 wt% microcarbides. The weight fraction microcarbides in the iron is influenced by carbide forming element concentrations, presence of elements that retard carbon diffusion, and cooling rate from the eutectic through the eutectoid temperature range. Tool wear rate increased at higher surface machining speeds and fraction microcarbides; all irons containing above 11.5% microcarbides had poor machinability. Graphite size, shape, distribution, etc. had a lesser effect on machinability. Reducing the addition of a foundry grade Ca and Al bearing 75% FeSi inoculant from 0.5 to 0.2% increased the tool life 100%. Inoculation test castings were also poured in a class 40 gray iron; laboratory analysis is currently underway. Exploratory studies were conducted to determine if tool force could be used to predict tool life: torque and feed forces were found to correlate with machinability.

Bates, C.E.; Littleton, H.E.; Eleftheriou, E.; Griffin, R.D.; Dwyer, Z.B.; DelSorbo, C.; Sprague, J.

1997-02-01T23:59:59.000Z

144

Folded-Light-Path Colloidal Quantum Dot Solar Cells  

E-Print Network [OSTI]

Folded-Light-Path Colloidal Quantum Dot Solar Cells Ghada I. Koleilat*, Illan J. Kramer*, Chris T, Canada. Colloidal quantum dot photovoltaics combine low-cost solution processing with quantum size-effect tuning to match absorption to the solar spectrum. Rapid advances have led to certified solar power

145

Oxygen Reduction Catalyzed by Platinum Nanoparticles Supported on Graphene Quantum Dots  

Science Journals Connector (OSTI)

graphene quantum dot; platinum nanoparticle; oxygen reduction; defect; X-ray diffraction; XPS; Tafel plot ...

Guoqiang He; Yang Song; Ke Liu; Andrew Walter; Sophie Chen; Shaowei Chen

2013-03-19T23:59:59.000Z

146

Thermally oxidized formation of new Ge dots over as-grown Ge dots in the Si capping layer  

SciTech Connect (OSTI)

A Si-capped Ge quantum dot sample was self-assembly grown via Stranski-Krastanov mode in a molecular beam epitaxy system with the Si capping layer deposited at 300 deg. C. After annealing the sample in an oxygen atmosphere at 1000 deg. C, a structure, namely two layers of quantum dots, was formed with the newly formed Ge-rich quantum dots embedded in the oxidized matrix with the position accurately located upon the as-grown quantum dots. It has been found that the formation of such nanostructures strongly depends upon the growth temperature and oxygen atmosphere. A growth mechanism was proposed to explain the formation of the nanostructure based on the Ge diffusion from the as-grown quantum dots, Ge segregation from the growing oxide, and subsequent migration/agglomeration.

Nie Tianxiao [State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433 (China); Materials Engineering, University of Queensland, Brisbane, Queensland QLD 4072 (Australia); Lin Jinhui; Shao Yuanmin; Wu Yueqin; Yang Xinju; Fan Yongliang; Jiang Zuimin [State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433 (China); Chen Zhigang [Materials Engineering, University of Queensland, Brisbane, Queensland QLD 4072 (Australia); Zou Jin [Materials Engineering, University of Queensland, Brisbane, Queensland QLD 4072 (Australia); Centre for Microscopy and Microanalysis, University of Queensland, Brisbane, Queensland QLD 4072 (Australia)

2011-12-01T23:59:59.000Z

147

Three-dimensional reconnection and relaxation of merging spheromak plasmas T. Gray, V. S. Lukin, M. R. Brown, and C. D. Cothran  

E-Print Network [OSTI]

Three-dimensional reconnection and relaxation of merging spheromak plasmas T. Gray, V. S. Lukin, M-dimensional reconnection and relaxation of merging spheromak plasmas" [Phys. Plasmas17, 102106 (2010)] Phys. Plasmas 17 and relaxation of merging spheromak plasmas T. Gray,1,a V. S. Lukin,2 M. R. Brown,1 and C. D. Cothran1,b 1

Brown, Michael R.

148

Photo-Induced Spin State Switching In [Fe(bpp){sub 2}](NCS){sub 2{center_dot}}2H{sub 2}O  

SciTech Connect (OSTI)

We present the results of our investigation into the effect of irradiation of green light on the high spin <--> low spin transition behavior of the mononuclear iron(II) compound [Fe(bpp){sub 2}](NCS){sub 2{center_dot}}2H{sub 2}O explored with the help of magnetic as well as Moessbauer spectroscopic studies. It has been found that the compound exhibits molecular bistability under irradiation of light due to LIESST effect.

Bhattacharjee, Ashis [Department of Physics, Visva-Bharati University, Santiniketan -731235 (India); Institut fuer Anorganische Chemie und Analytische Chemie, Johannes-Gutenberg Universitaet, D-55099 Mainz (Germany); Goodwin, Harry A. [School of Chemistry, University of New South Wales, UNSW 2052, Sydney (Australia); Guetlich, Philipp [Institut fuer Anorganische Chemie und Analytische Chemie, Johannes-Gutenberg Universitaet, D-55099 Mainz (Germany)

2010-12-01T23:59:59.000Z

149

Shift and gray scale invariant features for palmprint identification using complex directional wavelet and local binary pattern  

Science Journals Connector (OSTI)

In this paper, a novel feature extraction framework is presented for palmprint identification, which provides a shiftable and gray scale invariant description of image achieving high identification accuracy at a low computational cost. The image is firstly ... Keywords: Complex directional wavelet, Local binary patterns, Palmprint identification, Pyramidal dual-tree directional filter bank

Meiru Mu; Qiuqi Ruan; Song Guo

2011-10-01T23:59:59.000Z

150

Full Length Article: Color-appearance-model based fusion of gray and pseudo-color images for medical applications  

Science Journals Connector (OSTI)

Fusion of gray and pseudo-color images presents more information of biological tissues in a single image and facilitates the interpretation of multimodalities in medical practice. However, fused results are hampered by the problems of blurred details, ... Keywords: Biomedical image fusion, CIECAM02, Color appearance model (CAM), Magnetic resonance imaging (MRI), Rainbow palette, Ultrasound

Tianjie Li, Yuanyuan Wang, Cai Chang, Na Hu, Yongping Zheng

2014-09-01T23:59:59.000Z

151

Wetlands Ecology and Management Instructors: Matthew Gray (mgray11@utk.edu) and Chris Graves (cgraves2@utk.edu)  

E-Print Network [OSTI]

WFS 340 Wetlands Ecology and Management Fall 2014 Instructors: Matthew Gray (mgray11@utk.htm Required Readings: Handed out in class or emailed. Recommended Text: Wetlands, 2007, 4th edition (ISBN 978-0-471-69967-5) or Wetlands, 2000, 3rd edition (ISBN 0-471-29232-X) Authors: William J. Mitsch and James G. Gosselink Course

Gray, Matthew

152

Wetlands Ecology and Management Instructors: Matthew Gray (mgray11@utk.edu) and Chris Graves (cgraves2@utk.edu)  

E-Print Network [OSTI]

WFS 340 Wetlands Ecology and Management Fall 2013 Instructors: Matthew Gray (mgray11@utk.htm Required Text: Wetland Restoration and Construction, 2011 (978-0-9834558-0-6) Author: Thomas Biebighauser Recommended Text: Wetlands, 2007, 4th edition (ISBN 978-0-471-69967-5) or Wetlands, 2000, 3rd edition (ISBN 0

Gray, Matthew

153

Dramatically enhanced self-assembly of GeSi quantum dots with superior photoluminescence induced by the substrate misorientation  

SciTech Connect (OSTI)

A dramatically enhanced self-assembly of GeSi quantum dots (QDs) is disclosed on slightly miscut Si (001) substrates, leading to extremely dense QDs and even a growth mode transition. The inherent mechanism is addressed in combination of the thermodynamics and the growth kinetics both affected by steps on the vicinal surface. Moreover, temperature-dependent photoluminescence spectra from dense GeSi QDs on the miscut substrate demonstrate a rather strong peak persistent up to 300 K, which is attributed to the well confinement of excitons in the dense GeSi QDs due to the absence of the wetting layer on the miscut substrate.

Zhou, Tong; Zhong, Zhenyang, E-mail: zhenyangz@fudan.edu.cn [State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433 (China)

2014-02-01T23:59:59.000Z

154

NREL: News - NREL and Partners Demonstrate Quantum Dots that Assemble  

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

113 113 NREL and Partners Demonstrate Quantum Dots that Assemble Themselves Surprising breakthrough could bolster quantum photonics, solar cell efficiency February 8, 2013 Scientists from the U.S. Department of Energy's National Renewable Energy Laboratory and other labs have demonstrated a process whereby quantum dots can self-assemble at optimal locations in nanowires, a breakthrough that could improve solar cells, quantum computing, and lighting devices. A paper on the new technology, "Self-assembled Quantum Dots in a Nanowire System for Quantum Photonics," appears in the current issue of the scientific journal Nature Materials. Quantum dots are tiny crystals of semiconductor a few billionths of a meter in diameter. At that size they exhibit beneficial behaviors of quantum

155

Lighting Up Individual DNA Binding Proteins with Quantum Dots  

Science Journals Connector (OSTI)

Lighting Up Individual DNA Binding Proteins with Quantum Dots ... Department of Chemistry and Biochemistry, DOE Institute for Genomics and Proteomics, and Department of Physiology, Geffen Medical School, UCLA, Los Angeles, California 90095 ...

Yuval Ebenstein; Natalie Gassman; Soohong Kim; Josh Antelman; Younggyu Kim; Sam Ho; Robin Samuel; Xavier Michalet; Shimon Weiss

2009-03-16T23:59:59.000Z

156

C3Bio.org - Resources: Quantum Dot Lab: Usage  

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

.png, .gif) Submit You are here: Home Resources Tools Quantum Dot Lab Usage 0 questions (Ask a question) 0 review(s) (Review this) 15 users, detailed usage 0...

157

Optoelectronic and photonic control of single quantum dots  

E-Print Network [OSTI]

Optoelectronic and photonic control of single quantum dots Samuel James Dewhurst Wolfson College University of Cambridge A thesis submitted for the degree of Doctor of Philosophy April 2010 Declaration This thesis describes work carried out...

Dewhurst, Samuel James

2010-10-12T23:59:59.000Z

158

Scalable quantum computer architecture with coupled donor-quantum dot qubits  

DOE Patents [OSTI]

A quantum bit computing architecture includes a plurality of single spin memory donor atoms embedded in a semiconductor layer, a plurality of quantum dots arranged with the semiconductor layer and aligned with the donor atoms, wherein a first voltage applied across at least one pair of the aligned quantum dot and donor atom controls a donor-quantum dot coupling. A method of performing quantum computing in a scalable architecture quantum computing apparatus includes arranging a pattern of single spin memory donor atoms in a semiconductor layer, forming a plurality of quantum dots arranged with the semiconductor layer and aligned with the donor atoms, applying a first voltage across at least one aligned pair of a quantum dot and donor atom to control a donor-quantum dot coupling, and applying a second voltage between one or more quantum dots to control a Heisenberg exchange J coupling between quantum dots and to cause transport of a single spin polarized electron between quantum dots.

Schenkel, Thomas; Lo, Cheuk Chi; Weis, Christoph; Lyon, Stephen; Tyryshkin, Alexei; Bokor, Jeffrey

2014-08-26T23:59:59.000Z

159

Transit Rider Information King County Metro Transit  

E-Print Network [OSTI]

Transit Rider Information King County Metro Transit Rider Information (206) 553-3000 http the On the Move Blog http://www.seattle.gov/transportation King County Road Services Division Road Maintenance closely with King County Metro Transit, the Seattle School District, local universities, hospitals

Queitsch, Christine

160

Fluorescence from a quantum dot and metallic nanosphere hybrid system  

SciTech Connect (OSTI)

We present energy absorption and interference in a quantum dot-metallic nanosphere system embedded on a dielectric substrate. A control field is applied to induce dipole moments in the nanosphere and the quantum dot, and a probe field is applied to monitor absorption. Dipole moments in the quantum dot or the metal nanosphere are induced, both by the external fields and by each other's dipole fields. Thus, in addition to direct polarization, the metal nanosphere and the quantum dot will sense one another via the dipole-dipole interaction. The density matrix method was used to show that the absorption spectrum can be split from one peak to two peaks by the control field, and this can also be done by placing the metal sphere close to the quantum dot. When the two are extremely close together, a self-interaction in the quantum dot produces an asymmetry in the absorption peaks. In addition, the fluorescence efficiency can be quenched by the addition of a metal nanosphere. This hybrid system could be used to create ultra-fast switching and sensing nanodevices.

Schindel, Daniel G. [Department of Mathematics and Statistics, University of Winnipeg, 515 Portage Avenue, Winnipeg, MB, R3B 2E9 (Canada); Singh, Mahi R. [Department of Physics and Astronomy, University of Western Ontario, 1151 Richmond Street, London, ON, N6A 3K7 (Canada)

2014-03-31T23:59:59.000Z

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


161

THE FABRICATION AND ANALYSIS OF QUANTUM-DOT THIN FILM LIGHT EMITTING DIODES FOR USE IN DISPLAYS TECHNOLOGIES.  

E-Print Network [OSTI]

??The quantum dot has many applications, one of which is the light emitting diode. Quantum dot light emitting diodes were fabricated for their use in (more)

Pickering, Shawn

2011-01-01T23:59:59.000Z

162

Low frequency gray-body factors and infrared divergences: rigorous results  

E-Print Network [OSTI]

Formal solutions to the mode equations for both spherically symmetric black holes and Bose-Einstein condensate acoustic black holes are obtained by writing the spatial part of the mode equation as a linear Volterra integral equation of the second kind. The solutions work for a massless minimally coupled scalar field in the s-wave or zero angular momentum sector for a spherically symmetric black hole and in the longitudinal sector of a 1D Bose-Einstein condensate acoustic black hole. These solutions are used to obtain in a rigorous way analytic expressions for the scattering coefficients and gray-body factors in the zero frequency limit. They are also used to study the infrared behaviors of the symmetric two-point function and two functions derived from it: the point-split stress-energy tensor for the massless minimally coupled scalar field in Schwarzschild-de Sitter spacetime and the density-density correlation function for a Bose-Einstein condensate acoustic black hole.

Anderson, Paul R; Balbinot, Roberto

2015-01-01T23:59:59.000Z

163

Fabrication and optimization of light emitting devices with core-shell quantum dots  

E-Print Network [OSTI]

Quantum dot light emitting devices (QD-LEDs) are promising options for the next generation of solid state lighting, color displays, and other optoelectronic applications. Overcoating quantum dots (QDs) -- semiconducting ...

Song, Katherine Wei

2013-01-01T23:59:59.000Z

164

Time-resolved photoluminescent spectra of CdSe quantum dots with surface treatment  

Science Journals Connector (OSTI)

The surface morphology is one of the important factors to determine the optical properties of colloidal quantum dots. Colloidal CdSe dots were synthesized by the injection of...

Shen, Jian; Zhang, Jiayu; Han, Xudong; Wang, Ziyao; Shen, Li; Cui, Yiping

2005-01-01T23:59:59.000Z

165

InAs/GaAs Quantum-Dot Intermediate-Band Solar Cells  

Science Journals Connector (OSTI)

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

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

166

Low-Cost Photovoltaics: Luminescent Solar Concentrators And Colloidal Quantum Dot Solar Cells  

E-Print Network [OSTI]

vacuum technology that is required in crystalline solar cellTechnologies, Inc. SolarWindow Quantum Dot Solar Cells

Leow, Shin Woei

2014-01-01T23:59:59.000Z

167

Two-path transport measurements with bias dependence on a triple quantum dot  

SciTech Connect (OSTI)

We present transport measurements on a lateral triple quantum dot with a star-like geometry and one lead attached to each dot. The system is studied in a regime close to established quadruple points, where all three dots are in resonance. The specific sample structure allows us to apply two different bias voltages to the two source leads and thus to study the influence between the paths with serial double dots.

Kotzian, M.; Rogge, M. C.; Haug, R. J. [Institut fr Festkrperphysik, Leibniz Universitt Hannover, Appelstr. 2, 30167 Hannover (Germany)

2013-12-04T23:59:59.000Z

168

Tunable few-electron double quantum dots and Klein tunnelling in ultraclean carbon nanotubes  

E-Print Network [OSTI]

Tunable few-electron double quantum dots and Klein tunnelling in ultraclean carbon nanotubes G. A. Steele*, G. Gotz and L. P. Kouwenhoven Quantum dots defined in carbon nanotubes are a platform for both with highly tunable barriers1 , but disorder has prevented tunable nanotube- based quantum-dot devices from

169

Switching Individual Quantum Dot Emission through Electrically Controlling Resonant Energy Transfer to Graphene  

Science Journals Connector (OSTI)

Also, as the inhomogeneous broadening of the quantum dots bandgap is larger than the QCSE shift, only certain donoracceptor pairs with highly similar energies are switchable. ... The simulated photoluminescence (solid green) was obtained by calculating the energy transfer rate from quantum dots to graphene. ...

Jiye Lee; Wei Bao; Long Ju; P. James Schuck; Feng Wang; Alexander Weber-Bargioni

2014-11-10T23:59:59.000Z

170

Modeling of InAs/GaAs Quantum Dot Solar Cells  

Science Journals Connector (OSTI)

This paper reports electrical characteristics of an intermediate band p-i-n GaAs solar cell with InAs quantum dots embedded in the intrinsic region using Synopsis TCAD simulation tools. Up to five layers of quantum dots have been taken into consideration ... Keywords: Quantum dots, Intermediate band, InAs, GaAs, Solar Cells, TCAD

Ayman Rizk; Kazi Islam; Ammar Nayfeh

2013-11-01T23:59:59.000Z

171

Midwave infrared quantum dot avalanche photodiode David A. Ramirez,a  

E-Print Network [OSTI]

Midwave infrared quantum dot avalanche photodiode David A. Ramirez,a Jiayi Shao, Majeed M. Hayat demonstration of a GaAs based avalanche photodiode APD operating in the midwave infrared region 3­5 m . In the device, called the quantum dot avalanche photodiode, an intersubband quantum dots-in-a-well detector

Hayat, Majeed M.

172

Self-organized formation of quantum dots of a material on a substrate  

DOE Patents [OSTI]

Systems and methods are described for fabricating arrays of quantum dots. A method for making a quantum dot device, includes: forming clusters of atoms on a substrate; and charging the clusters of atoms such that the clusters of atoms repel one another. The systems and methods provide advantages because the quantum dots can be ordered with regard to spacing and/or size.

Zhang, Zhenyu (232 Long Bow Rd., Knoxville, TN 37922); Wendelken, John F. (925 Suwanee Rd., Knoxville, TN 37923); Chang, Ming-Che (F4-2, No. 178 Sec 5 Minsheng East Rd., Taipei, TW); Pai, Woei Wu (1F, No. 17, Alley 11, Lane 202, Ming Chyuan Rd., Pan Chou City, Taipei County, TW)

2001-01-01T23:59:59.000Z

173

Los Alamos researchers unravel the mystery of quantum dot blinking  

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

Researchers unravel the mystery of quantum dot blinking Researchers unravel the mystery of quantum dot blinking Los Alamos researchers unravel the mystery of quantum dot blinking Most exciting is that the Los Alamos researchers have shown that blinking can be controlled and even completely suppressed electrochemically. November 9, 2011 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy

174

Gas turbine combustor transition  

DOE Patents [OSTI]

A method is described for converting a steam cooled transition to an air cooled transition in a gas turbine having a compressor in fluid communication with a combustor, a turbine section in fluid communication with the combustor, the transition disposed in a combustor shell and having a cooling circuit connecting a steam outlet and a steam inlet and wherein hot gas flows from the combustor through the transition and to the turbine section, includes forming an air outlet in the transition in fluid communication with the cooling circuit and providing for an air inlet in the transition in fluid communication with the cooling circuit. 7 figs.

Coslow, B.J.; Whidden, G.L.

1999-05-25T23:59:59.000Z

175

Cooling an electron gas using quantum dot based electronic refrigeration  

E-Print Network [OSTI]

comparable to the Fermi wavelength. Con- finement in the other two directions (x and y) is over large enough distances for the quantisation of momentum in the x-y plane to be neglected. The energy of a carrier with effective mass m? can therefore be written... (negative) current from drain to source. The blue lines show non-zero differential conductance. The angles ?S and ?D are used to determine the conversion factor between VG and dot energy. Insets (a)-(c) show the energy levels of the dot at the corresponding...

Prance, Jonathan Robert

2009-10-13T23:59:59.000Z

176

Single-Molecule Measurements of Gold-Quenched Quantum Dots  

Science Journals Connector (OSTI)

We report the study of the quenching of quantum dots (CdSe) by gold nanoparticles at the single-molecule level. Double-stranded DNA is used as a rigid spacer to tune the distance between the two nanoparticles. The width of the fluorescent intensity distribution, monitored at different interparticle distances, reflects both the nanoparticle heterogeneity and the fluorescence intermittency of the quantum dot. The fluorescence distribution emitted by single CdSe nanocrystals can easily be distinguished from the fluorescence of partially quenched CdSe. Our results show that the distance-dependence quenching is compatible with a Frster-type process.

Zoher Gueroui and Albert Libchaber

2004-10-15T23:59:59.000Z

177

Gallium diffusion into self-assembled InAs quantum dots grown on indium phosphide substrates  

SciTech Connect (OSTI)

The photoluminescence spectrum of small self-assembled In(Ga)As quantum dots grown on InP substrates is composed of distinct spectral lines. These lines correspond to monolayer variations in the dots smallest dimension: their heights. We use this phenomenon in order to study the diffusion of gallium atoms into the self-assembled quantum dots. We demonstrate that substantial amounts of gallium atoms diffuse from a strained GaInP layer underneath the quantum dots into the quantum dots.

Raz, T.; Shuall, N.; Bahir, G.; Ritter, D.; Gershoni, D.; Chu, S.N.G. [Department of Electrical Engineering, Technion - Israel Institute of Technology, Technion City, Haifa 32000 (Israel); Physics Department and The Solid State Institute, Technion - Israel Institute of Technology, Technion City, Haifa 32000 (Israel); Multiplex, Inc., 5000 Hadley Rd., South Plainfield, New Jersey 07080 (United States)

2004-10-18T23:59:59.000Z

178

Piecewise Linear Phase Transitions  

E-Print Network [OSTI]

It is shown how simple assumptions lead to piecewise linear behavior, which is observed in certain phase transitions.

Joseph B. Keller

2007-11-26T23:59:59.000Z

179

Management Transition Guidance  

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

Records and Information Records and Information Management Transition Guidance November 2013 Records and Information Management Transition Guidance i Records and Information Management Transition Guidance Table of Contents Executive Summary ........................................................................................................................ 1 1.0 Introduction and Purpose ..................................................................................................... 1 LM Records Functions ................................................................................................................ 1 2.0 The Records Life Cycle ....................................................................................................... 2 3.0 Organizational Responsibilities ........................................................................................... 2

180

Intermediate-band photosensitive device with quantum dots having tunneling barrier embedded in organic matrix  

DOE Patents [OSTI]

A plurality of quantum dots each have a shell. The quantum dots are embedded in an organic matrix. At least the quantum dots and the organic matrix are photoconductive semiconductors. The shell of each quantum dot is arranged as a tunneling barrier to require a charge carrier (an electron or a hole) at a base of the tunneling barrier in the organic matrix to perform quantum mechanical tunneling to reach the respective quantum dot. A first quantum state in each quantum dot is between a lowest unoccupied molecular orbital (LUMO) and a highest occupied molecular orbital (HOMO) of the organic matrix. Wave functions of the first quantum state of the plurality of quantum dots may overlap to form an intermediate band.

Forrest, Stephen R. (Ann Arbor, MI)

2008-08-19T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

Alternative Fuels Data Center: U.S. DOT Proposes Waiver under the Buy  

Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

DOT Proposes DOT Proposes Waiver under the Buy America Program for Alternative Fuel Vehicle Projects to someone by E-mail Share Alternative Fuels Data Center: U.S. DOT Proposes Waiver under the Buy America Program for Alternative Fuel Vehicle Projects on Facebook Tweet about Alternative Fuels Data Center: U.S. DOT Proposes Waiver under the Buy America Program for Alternative Fuel Vehicle Projects on Twitter Bookmark Alternative Fuels Data Center: U.S. DOT Proposes Waiver under the Buy America Program for Alternative Fuel Vehicle Projects on Google Bookmark Alternative Fuels Data Center: U.S. DOT Proposes Waiver under the Buy America Program for Alternative Fuel Vehicle Projects on Delicious Rank Alternative Fuels Data Center: U.S. DOT Proposes Waiver under the Buy America Program for Alternative Fuel Vehicle Projects on Digg

182

Electronic structure of quantum dots Stephanie M. Reimann  

E-Print Network [OSTI]

Electronic structure of quantum dots Stephanie M. Reimann Mathematical Physics, Lund Institute are reviewed. Experimental techniques for measuring the electronic shell structure and the effect of magnetic fields are briefly described. The electronic structure is analyzed in terms of simple single

Wu, Zhigang

183

State DOT: Colorado State Report Questions on MEPDG Implementation  

E-Print Network [OSTI]

State DOT: Colorado State Report Questions on MEPDG Implementation 1. Summarize your state's status as far as MEPDG Implementation. Currently, CDOT is in the process of validating the MEPDG in Colorado and calibrating it to Colorado performance data. 2. What efforts have been made toward local calibration? CDOT has

184

Phonons in quantum dots and their role in exciton dephasing  

E-Print Network [OSTI]

-nitrides. Values are taken from [5]. The values for the nitride compounds are taken from density functional dots (QDs). The state of the art is reported in detail in the present book. A large application- driven the theory of acoustic phonons in QDs is explained in Sec. 3. Special emphasis is given to continuum

Zimmermann, Roland

185

Circuit QED in a double quantum dot system  

SciTech Connect (OSTI)

Strong coupling peculiar feature is demonstrated in a coupled qubit-resonator system consisting of a GaAs double quantum dot and a coplanar waveguide resonator. Qubit-resonator coupling strength (g and the decoherence rate ? are directly derived from the experiment, assuring a strong coupling condition (g/? ? 2)

Toida, Hiraku; Nakajima, Takashi; Komiyama, Susumu [Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902 (Japan)

2013-12-04T23:59:59.000Z

186

Ultrasmall silicon quantum dots F. A. Zwanenburg,1,a  

E-Print Network [OSTI]

by a model based on the Poisson equation. The smallest dots 12 nm allow identification of the last charge-down planar silicon devices,1­3 produced by etching bulk materials down to nanometer dimensions, often show understanding of the specific system. This has allowed us to realize the first experimental identification

187

Quantum dot-based nanomaterials for biological imaging  

E-Print Network [OSTI]

Quantum dot-based fluorescent probes were synthesized and applied to biological imaging in two distinct size regimes: (1) 100-1000 nm and (2) < 10 nm in diameter. The larger diameter range was accessed by doping CdSe/ZnS ...

Zimmer, John P. (John Philip)

2006-01-01T23:59:59.000Z

188

Alabama DOT: Alabama Report Questions on NDT Testing  

E-Print Network [OSTI]

Alabama DOT: Alabama Report Questions on NDT Testing 1. What NDT testing methods for concrete materials, concrete pavements, and overlays are you trying? · We perform pavement smoothness testing, pavement friction testing and FWD testing · We are currently using GPR on the I-59 project to locate voids

189

State DOT: PENNSYLVANIA State Report Questions on NDT Testing  

E-Print Network [OSTI]

State DOT: PENNSYLVANIA State Report Questions on NDT Testing 1. What NDT testing methods Deflectometer (FWD) testing on our pavements by request. We are currently looking into the use of Rolling Weight) to analyze our pavements. 2. In your experience, how does the reliability of NDT testing methods compare

190

State DOT: Colorado State Report Questions on NDT Testing  

E-Print Network [OSTI]

State DOT: Colorado State Report Questions on NDT Testing 1. What NDT testing methods for concrete materials, concrete pavements, and overlays are you trying? a. Maturity meters are used to test PCCP form and false work and continuing to the next phase of construction. b. Testing for dowel bar

191

POSSIBLE DEFINTION OF QUANTUM BITS IN COUPLED QUANTUM DOTS  

E-Print Network [OSTI]

by applying transport spectroscopy at ultra low temperatures. We determine the strength of this tunnel coupled quantum dot ­ coupled to leads by tunneling barriers. Due to the ultra small capacitance the Coulomb be operated at temperatures of some 10 mK [1], but by now operation of metallic SETs at temperatures up to 100

Ludwig-Maximilians-Universität, München

192

Depleted-Heterojunction Colloidal Quantum Dot Solar Cells  

E-Print Network [OSTI]

Depleted-Heterojunction Colloidal Quantum Dot Solar Cells Andras G. Pattantyus-Abraham,, Illan J and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada-circuit voltage (Voc) and fill factor (FF). The power conversion efficiency ( ) for an in- put solar intensity

193

Colloidal Quantum Dot Photovoltaics: The Effect of Polydispersity David Zhitomirsky,,  

E-Print Network [OSTI]

, Ontario M5S 3G4, Canada Division of Physical Sciences and Engineering, Solar and Photo polydispersity. KEYWORDS: Energy landscaping, colloidal quantum dot, photovoltaics, solar cell, polydispersity diodes,4,5 and solar cells.6,7 At present, the most efficient CQD solar cells8 employ the depleted

194

Transitive associations 1 Running head: TRANSITIVE ASSOCIATIONS  

E-Print Network [OSTI]

transitions; across-pair associations (e.g. A-C) showed no evidence for asymmetry. While this pattern; Kahana, Howard, Zaromb, & Wingfield, 2002; Klein, Addis, & Kahana, 2005) estimates the probability

Howard, Marc

195

Control of the direction and rate of nuclear spin flips in InAs quantum dots using detuned optical pulse trains  

E-Print Network [OSTI]

We find that detuning an optical pulse train from electronic transitions in quantum dots controls the direction of nuclear spin flips. The optical pulse train generates electron spins that precess about an applied magnetic field, with a spin component parallel to the field only for detuned pulses. This component leads to asymmetry in the nuclear spin flips, providing a way to produce a stable and precise value of the nuclear spin polarization. This effect is observed using two-color, time-resolved Faraday rotation and ellipticity.

S. G. Carter; A. Shabaev; Sophia E. Economou; T. A. Kennedy; A. S. Bracker; T. L. Reinecke

2009-01-16T23:59:59.000Z

196

Exploring size and state dynamics in CdSe quantum dots using two-dimensional electronic spectroscopy  

SciTech Connect (OSTI)

Development of optoelectronic technologies based on quantum dots depends on measuring, optimizing, and ultimately predicting charge carrier dynamics in the nanocrystal. In such systems, size inhomogeneity and the photoexcited population distribution among various excitonic states have distinct effects on electron and hole relaxation, which are difficult to distinguish spectroscopically. Two-dimensional electronic spectroscopy can help to untangle these effects by resolving excitation energy and subsequent nonlinear response in a single experiment. Using a filament-generated continuum as a pump and probe source, we collect two-dimensional spectra with sufficient spectral bandwidth to follow dynamics upon excitation of the lowest three optical transitions in a polydisperse ensemble of colloidal CdSe quantum dots. We first compare to prior transient absorption studies to confirm excitation-state-dependent dynamics such as increased surface-trapping upon excitation of hot electrons. Second, we demonstrate fast band-edge electron-hole pair solvation by ligand and phonon modes, as the ensemble relaxes to the photoluminescent state on a sub-picosecond time-scale. Third, we find that static disorder due to size polydispersity dominates the nonlinear response upon excitation into the hot electron manifold; this broadening mechanism stands in contrast to that of the band-edge exciton. Finally, we demonstrate excitation-energy dependent hot-carrier relaxation rates, and we describe how two-dimensional electronic spectroscopy can complement other transient nonlinear techniques.

Caram, Justin R.; Zheng, Haibin; Rolczynski, Brian S.; Griffin, Graham B.; Engel, Gregory S., E-mail: gsengel@uchicago.edu [Department of Chemistry, The Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637 (United States); Dahlberg, Peter D. [Graduate Program in the Biophysical Sciences, The Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637 (United States)] [Graduate Program in the Biophysical Sciences, The Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637 (United States); Dolzhnikov, Dmitriy S.; Talapin, Dmitri V. [Department of Chemistry and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637 (United States)] [Department of Chemistry and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637 (United States)

2014-02-28T23:59:59.000Z

197

Ultrafast carrier dynamics in semiconductor quantum dots  

Science Journals Connector (OSTI)

The dynamics of band-edge photoluminescence (PL) in CdS nanocrystals (NCs) dispersed in a glass matrix are studied with the femtosecond up-conversion technique. The time-resolved PL spectra exhibit several discrete features (three of them are in the NC energy band gap) which are not pronounced in a cw PL spectrum. The initial stage of a PL decay is governed by a depopulation of the lowest extended states due to carrier trapping (localization) on the time scale of 1 ps. The low-energy bands originating from the extended-to-localized state transitions exhibit extremely fast buildup dynamics (rise time is 400700 fs) which is explained by the preexisting occupation of the localized states. 1996 The American Physical Society.

V. Klimov; P. Haring Bolivar; H. Kurz

1996-01-15T23:59:59.000Z

198

Cathodoluminescence imaging and spectroscopy of excited states in InAs self-assembled quantum dots  

SciTech Connect (OSTI)

We have examined state filling and thermal activation of carriers in buried InAs self-assembled quantum dots (SAQDs) with excitation-dependent cathodoluminescence (CL) imaging and spectroscopy. The InAs SAQDs were formed during molecular-beam epitaxial growth of InAs on undoped planar GaAs (001). The intensities of the ground- and excited-state transitions were analyzed as a function of temperature and excitation density to study the thermal activation and reemission of carriers. The thermal activation energies associated with the thermal quenching of the luminescence were measured for ground- and excited-state transitions of the SAQDs, as a function of excitation density. By comparing these activation energies with the ground- and excited-state transition energies, we have considered various processes that describe the reemission of carriers. Thermal quenching of the intensity of the QD ground- and first excited-state transitions at low excitations in the {approx}230-300-K temperature range is attributed to dissociation of excitons from the QD states into the InAs wetting layer. At high excitations, much lower activation energies of the ground and excited states are obtained, suggesting that thermal reemission of single holes from QD states into the GaAs matrix is responsible for the observed temperature dependence of the QD luminescence in the {approx}230-300-K temperature range. The dependence of the CL intensity of the ground-and first excited-state transition on excitation density was shown to be linear at all temperatures at low-excitation density. This result can be understood by considering that carriers escape and are recaptured as excitons or correlated electron-hole pairs. At sufficiently high excitations, state-filling and spatial smearing effects are observed together with a sublinear dependence of the CL intensity on excitation. Successive filling of the ground and excited states in adjacent groups of QDs that possess different size distributions is assumed to be the cause of the spatial smearing.

Khatsevich, S.; Rich, D.H.; Kim, Eui-Tae; Madhukar, A. [Department of Physics, Ilse Katz Center for Meso and Nanoscale Science and Technology, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105 (Israel); Department of Materials Science and Engineering, Nanostructure Materials and Devices Laboratory, University of Southern California, Los Angeles, California 90089-0241 (United States)

2005-06-15T23:59:59.000Z

199

Simulation of quantum dots size and spacing effect for intermediate band solar cell application based on InAs quantum dots arrangement in GaAs  

SciTech Connect (OSTI)

Intermediate band solar cell (IBSC) has become a promising technology in increasing solar cell efficiency. In this work we compare absorption coefficient profile between InAs quantum dots with GaAs bulk. We calculate the efficiency of GaAs bulk and GaAs doped with 2, 5, and 10 nm InAs quantum dot. Effective distances in quantum dot arrangement based on electron tunneling consideration were also calculated. We presented a simple calculation method with low computing power demand. Results showed that arrangement of quantum dot InAs in GaAs can increase solar cell efficiency from 23.9 % initially up to 60.4%. The effective distance between two quantum dots was found 2 nm in order to give adequate distance to prevent electron tunneling and wave functions overlap.

Hendra, P. I. B., E-mail: ib.hendra@gmail.com; Rahayu, F., E-mail: ib.hendra@gmail.com; Darma, Y., E-mail: ib.hendra@gmail.com [Physical Vapor Deposition Laboratory, Physics of Material Electronics Research, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132 (Indonesia)

2014-03-24T23:59:59.000Z

200

Impact of nanostructure configuration on the photovoltaic performance of quantum dot arrays  

E-Print Network [OSTI]

In this work, an effective quantum model based on the non-equilibrium Green's function formalism is used to investigate a selectively contacted high density quantum dot array in an wide band gap host matrix for operation as a quantum dot-enhanced single junction solar cell. By establishing a direct relation between nanostructure configuration and optoelectronic properties, the investigation reveals the influence of inter-dot and dot-contact coupling strength on the radiative rates and consequently on the ultimate performance of photovoltaic devices with finite quantum dot arrays as the active medium. The dominant effects originate in the dependence of the Joint Density of States on the inter-dot coupling in terms of band width and effective band gap.

Berbezier, Aude

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

Antimony mediated growth of high-density InAs quantum dots for photovoltaic cells  

SciTech Connect (OSTI)

We report enhanced solar cell performance using high-density InAs quantum dots. The high-density quantum dot was grown by antimony mediated molecular beam epitaxy. In-plane quantum dot density over 1 10{sup 11} cm{sup ?2} was achieved by applying a few monolayers of antimony on the GaAs surface prior to quantum dot growth. The formation of defective large clusters was reduced by optimization of the growth temperature and InAs coverage. Comparing with a standard quantum dot solar cell without the incorporation of antimony, the high-density quantum dot solar cell demonstrates a distinct improvement in short-circuit current from 7.4 mA/cm{sup 2} to 8.3 mA/cm{sup 2}.

Tutu, F. K.; Wu, J.; Lam, P.; Tang, M.; Liu, H. [Department of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E 7JE (United Kingdom)] [Department of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E 7JE (United Kingdom); Miyashita, N.; Okada, Y. [Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo 153-8904 (Japan)] [Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo 153-8904 (Japan); Wilson, J.; Allison, R. [Defence Science and Technology Laboratory, Portsdown West, Portsdown Hill Road, Fareham Hants PO17 6AD (United Kingdom)] [Defence Science and Technology Laboratory, Portsdown West, Portsdown Hill Road, Fareham Hants PO17 6AD (United Kingdom)

2013-07-22T23:59:59.000Z

202

Gray, W. D., Corbett, A. T., & VanLehn, K. (1988). Planning and Implementation Errors in Algorithm Design, Eleventh Annual Conference of the Cognitive Science Society (pp. 594-600). Montreal, Canada.  

E-Print Network [OSTI]

. In this paper, we outline a set of basic planning steps for designing this algorithm and examine variationsGray, W. D., Corbett, A. T., & VanLehn, K. (1988). Planning and Implementation Errors in Algorithm. Planning and Implementation Errors in Algorithm Design Wayne D. Gray, Albert T. Corbett, & Kurt Van Lehn U

Gray, Wayne

203

Resonant scattering of surface plasmon polaritons by dressed quantum dots  

SciTech Connect (OSTI)

The resonant scattering of surface plasmon-polariton waves (SPP) by embedded semiconductor quantum dots above the dielectric/metal interface is explored in the strong-coupling regime. In contrast to non-resonant scattering by a localized dielectric surface defect, a strong resonant peak in the spectrum of the scattered field is predicted that is accompanied by two side valleys. The peak height depends nonlinearly on the amplitude of SPP waves, reflecting the feedback dynamics from a photon-dressed electron-hole plasma inside the quantum dots. This unique behavior in the scattered field peak strength is correlated with the occurrence of a resonant dip in the absorption spectrum of SPP waves due to the interband photon-dressing effect. Our result on the scattering of SPP waves may be experimentally observable and applied to spatially selective illumination and imaging of individual molecules.

Huang, Danhong; Cardimona, Dave [Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117 (United States); Easter, Michelle [Department of Mechanical Engineering, Stevens Institute of Technology, 1 Castle Point Terrace, Hoboken, New Jersey 07030 (United States); Gumbs, Godfrey [Department of Physics and Astronomy, Hunter College of the City University of New York, 695 Park Avenue, New York, New York 10065 (United States); Maradudin, A. A. [Department of Physics and Astronomy, University of California, Irvine, California 92697 (United States); Lin, Shawn-Yu [Department of Electrical, Computer and Systems Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180 (United States); Zhang, Xiang [Department of Mechanical Engineering, 3112 Etcheverry Hall, University of California at Berkeley, Berkeley, California 94720 (United States)

2014-06-23T23:59:59.000Z

204

Simulations of magnetic field gradients due to micro-magnets on a triple quantum dot circuit  

SciTech Connect (OSTI)

To quantify the effects of local magnetic fields on triple quantum dots, the Heisenberg Hamiltonian has been diagonalized for three electrons coupled via the exchange interaction. In particular, we have investigated different geometries of micro-magnets located on top of the triple dot in order to optimize the field gradient characteristics. In this paper, we focus on two geometries which are candidates for an addressable EDSR triple quantum dot device.

Poulin-Lamarre, G. [National Research Council of Canada, Ottawa, On., Canada, K1A-0R6 and Dpartement de physique, Universit de Sherbrooke, Sherbrooke, Qc. J1K-2R1 (Canada); Bureau-Oxton, C. [Dpartement de physique, Universit de Sherbrooke, Sherbrooke, Qc. J1K-2R1 (Canada); Kam, A. [National Research Council of Canada, Ottawa, On. K1A-0R6 (Canada); Zawadzki, P.; Aers, G. [National Research Council of Canada, Ottawa, On. K1A-0R6 (Canada); Studenikin, S. [National Research Council of Canada, Ottawa, On.K1A-0R6 (Canada); Pioro-Ladrire, M. [Dpartement de physique, Universit de Sherbrooke, Sherbrooke, Qc. J1K-2R1 (Canada); Sachrajda, A. S. [National Research Council of Canada, Ottawa, On., Canada, K1A-0R6 and Dpartement de physique, Universit de Sherbrooke, Sherbrooke, Qc. J1K-2R1 (Canada)

2013-12-04T23:59:59.000Z

205

Slow Hot-Carrier Relaxation in Colloidal Graphene Quantum Dots  

Science Journals Connector (OSTI)

Here we show that carrier cooling in colloidal graphene quantum dots can be 2 orders of magnitude slower than in bulk materials, which could enable harvesting of hot charge carriers to improve the efficiency of solar energy conversion. ... We speculate that the state(s) should have higher excitation energy because of the shorter lifetime (18 ps), which nevertheless is also significantly longer than those in bulk materials, and greater density of states at higher energies. ...

Mallory L. Mueller; Xin Yan; Bogdan Dragnea; Liang-shi Li

2010-12-02T23:59:59.000Z

206

Photoluminescence upconversion in colloidal CdTe quantum dots  

Science Journals Connector (OSTI)

Efficient photoluminescence (PL) up-conversion has been observed in colloidal CdTe quantum dots with an energy gain of as high as 360 meV. Compared with the normal PL, the peak energy of this up-converted PL (UCPL) shows a redshift of about 80 meV, and the corresponding radiative lifetime becomes nearly twice as long. This UCPL is attributed to the carrier recombination involving surface states mainly through a thermal excitation process.

Xiaoyong Wang; W. William Yu; Jiayu Zhang; Jose Aldana; Xiaogang Peng; Min Xiao

2003-09-22T23:59:59.000Z

207

A Graphene Quantum Dot with a Single Electron Transistor as Integrated Charge Sensor  

E-Print Network [OSTI]

We have developed an etching process to fabricate a quantum dot and a nearby single electron transistor as a charge detector in a single layer graphene. The high charge sensitivity of the detector is used to probe Coulomb diamonds as well as excited spectrum in the dot, even in the regime where the current through the quantum dot is too small to be measured by conventional transport means. The graphene based quantum dot and integrated charge sensor serve as an essential building block to form a solid-state qubit in a nuclear-spin-free quantum world.

Ling-Jun Wang; Gang Cao; Tao Tu; Hai-Ou Li; Cheng Zhou; Xiao-Jie Hao; Zhan Su; Guang-Can Guo; Guo-Ping Guo; Hong-Wen Jiang

2010-08-28T23:59:59.000Z

208

SciTech Connect: Giant Nanocrystal Quantum Dots as Stable and...  

Office of Scientific and Technical Information (OSTI)

Giant Nanocrystal Quantum Dots as Stable and Efficient Down-Conversion Phosphor for LED based Solid State Lighting Citation Details In-Document Search Title: Giant Nanocrystal...

209

Surface-emitting red, green, and blue colloidal quantum dot distributed feedback lasers  

Science Journals Connector (OSTI)

We demonstrate surface emitting distributed feedback (DFB) lasers across the red, green, and blue from densely packed colloidal quantum dot (CQD) films. The solid CQD films were...

Roh, Kwangdong; Dang, Cuong; Lee, Joonhee; Chen, Songtao; Steckel, Jonathan S; Coe-Sullivan, Seth; Nurmikko, Arto

2014-01-01T23:59:59.000Z

210

Comment on "Analysis of quantum coherent semiconductor quantum dot p-i-n junction photovoltaic cells"  

E-Print Network [OSTI]

This is a comment on PRL paper by A.P. Kirk "Analysis of quantum coherent semiconductor quantum dot p-i-n junction photovoltaic cells"

Scully, Marlan O

2010-01-01T23:59:59.000Z

211

A statistical approach to assess measurement reliability of functional DOT for brain imaging  

Science Journals Connector (OSTI)

A statistical approach, based on six forms of the intraclass correlation coefficient, is reviewed, interpreted, and used to assess measurement reliability of functional DOT for brain...

LI, LIN; Zeng, Li; Cazzell, Mary A; Liu, Hanli

212

DOE Grids Service Transition  

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

DOE Grids Service Transition DOE Grids Service Transition Services Overview ECS Audio/Video Conferencing Fasterdata IPv6 Network Network Performance Tools (perfSONAR) ESnet OID Registry PGP Key Service Virtual Circuits (OSCARS) DOE Grids Service Transition Contact Us Technical Assistance: 1 800-33-ESnet (Inside the US) 1 800-333-7638 (Inside the US) 1 510-486-7600 (Globally) 1 510-486-7607 (Globally) Report Network Problems: trouble@es.net Provide Web Site Feedback: info@es.net DOE Grids Service Transition Background ESnet has decided to transition support and management for the certificate services provided by the DOE Grids public key infrastructure (PKI) to the Open Sciences Grid (OSG). OSG and ESnet provide service to many of the same user communities, and have long been collaborators in the areas of identity

213

Federal Transit Administration-National Transit Database (NTD) | Open  

Open Energy Info (EERE)

Federal Transit Administration-National Transit Database (NTD) Federal Transit Administration-National Transit Database (NTD) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Federal Transit Administration-National Transit Database (NTD) Agency/Company /Organization: Federal Transit Administration Sector: Energy Focus Area: Transportation Resource Type: Dataset User Interface: Website Website: www.ntdprogram.gov/ntdprogram/ Cost: Free Language: English Federal Transit Administration-National Transit Database (NTD) Screenshot References: National Transit Database[1] "The NTD was established by Congress to be the Nation's primary source for information and statistics on the transit systems of the United States. Recipients or beneficiaries of grants from the Federal Transit Administration (FTA) under the Urbanized Area Formula Program (§5307) or

214

The solubility of selenate-AFt (3CaO{center_dot}Al{sub 2}O{sub 3}{center_dot}3CaSeO{sub 4}{center_dot}37.5H{sub 2}O) and selenate-AFm (3CaO{center_dot}Al{sub 2}O{sub 3}{center_dot}CaSeO{sub 4}{center_dot}xH{sub 2}O)  

SciTech Connect (OSTI)

The Se(VI)-analogues of ettringite and monosulfate, selenate-AFt (3CaO{center_dot}Al{sub 2}O{sub 3}{center_dot}3CaSeO{sub 4}{center_dot}37.5H{sub 2}O), and selenate-AFm (3CaO{center_dot}Al{sub 2}O{sub 3}{center_dot}CaSeO{sub 4}{center_dot}xH{sub 2}O) were synthesised and characterised by bulk chemical analysis and X-ray diffraction. Their solubility products were determined from a series of batch and resuspension experiments conducted at 25 deg. C. For selenate-AFt suspensions, the pH varied between 11.37 and 11.61, and a solubility product, log K{sub so}=61.29{+-}0.60 (I=0 M), was determined for the reaction 3CaO{center_dot}Al{sub 2}O{sub 3}{center_dot}3CaSeO{sub 4}{center_dot}37.5H{sub 2}O+12 H{sup +} implies 6Ca{sup 2+}+2Al{sup 3+}+3SeO{sub 4}{sup 2-}+43.5H{sub 2}O. Selenate-AFm synthesis resulted in the uptake of Na, which was leached during equilibration and resuspension. For the pH range of 11.75 to 11.90, a solubility product, log K{sub so}=73.40{+-}0.22 (I=0 M), was determined for the reaction 3CaO{center_dot}Al{sub 2}O{sub 3}{center_dot}CaSeO{sub 4}{center_dot}xH{sub 2}O+12 H{sup +} implies 4Ca{sup 2+}+2Al{sup 3+}+SeO{sub 4}{sup 2-}+(x+6)H{sub 2}O. Thermodynamic modelling suggested that both selenate-AFt and selenate-AFm are stable in the cementitious matrix; and that in a cement limited in sulfate, selenate concentration may be limited by selenate-AFm to below the millimolar range above pH 12.

Baur, Isabel; Johnson, C. Annette

2003-11-01T23:59:59.000Z

215

IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 52, NO. 5, OCTOBER 2005 1271 Measurement of Centi-Gray X-Ray Dose  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 52, NO. 5, OCTOBER 2005 1271 Measurement of Centi-Gray X- bination of single sheet higher film sensitivity to low energy X-rays along with a layered film dosimetryGy if required. Index Terms--Absorption spectra, gafchromic XR type T, low dose, radiation dosimetry

Yu, K.N.

216

Nuclear Magnetic Resonance Inverse Spectra of InGaAs Quantum Dots: Atomistic Level Structural Information  

E-Print Network [OSTI]

A wealth of atomistic information is buried within a self-assembled quantum dot (QD), carrying the legacy of its chemical composition and the growth history. In the presence of quadrupolar nuclei, as in InGaAs QDs, much of this is inherited to nuclear spins. With this computational study, we identify what sorts of atomistic information can be tapped from a single InGaAs QD, as probed optically by the recently introduced highly sensitive inverse spectra nuclear magnetic resonance technique. To capture the fingerprints of alloying in the spectra, we compare In0.2Ga0.8As QD with the compound InAs QD of the same shape, as well as performing a search over the parameter space of the inverse spectra technique. We display how both the elemental nuclear properties and local bonding take roles. The arsenic nuclei with their small gyromagnetic ratio are the most vulnerable to strain at a given magnetic field. Furthermore, because of their large S44 gradient elastic tensor components, the deviation of the major electric field gradient axis from the static magnetic field is also the largest. Moreover, this axial tilting has a big variance caused by the availability of various arsenic-centric nearest-neighbor configurations under cation alloying. We identify that a signature of alloying as opposed to segregated binaries within the QD is a peak that appears like an additional satellite transition of 75As. The local chemical and strain environment distinctly affect the isotopic line profiles, in particular the central transitions, for which we provide an in-depth analysis. We demonstrate the possibility of restoring to a large extend a monoenergetic distribution of isotopic nuclear spins by simply tilting the sample within a range of angles with respect to static magnetic field.

Ceyhun Bulutay; E. A. Chekhovich; A. I. Tartakovskii

2014-08-02T23:59:59.000Z

217

Connecticut Transit (CTTRANSIT) Fuel Cell Transit Bus: Second...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Second Evaluation Report and Appendices Connecticut Transit (CTTRANSIT) Fuel Cell Transit Bus: Second Evaluation Report and Appendices This report describes operations at...

218

Holographic Magnetic Phase Transition  

E-Print Network [OSTI]

We study four-dimensional interacting fermions in a strong magnetic field, using the holographic Sakai-Sugimoto model of intersecting D4 and D8 branes in the deconfined, chiral-symmetric parallel phase. We find that as the magnetic field is varied, while staying in the parallel phase, the fermions exhibit a first-order phase transition in which their magnetization jumps discontinuously. Properties of this transition are consistent with a picture in which some of the fermions jump to the lowest Landau level. Similarities to known magnetic phase transitions are discussed.

Gilad Lifschytz; Matthew Lippert

2009-06-21T23:59:59.000Z

219

Information and Records Management Transition Guidance | Department...  

Energy Savers [EERE]

Information and Records Management Transition Guidance Information and Records Management Transition Guidance Information and Records Management Transition Guidance (March 2004)...

220

Efficient Mn-doped CdS quantum dot sensitized solar cells based on SnO2 microsphere photoelectrodes  

Science Journals Connector (OSTI)

Mn-doped CdS quantum dot sensitized solar cells based on...2...microsphere photoelectrodes are prepared with successive ionic layer adsorption and reaction method. It is found that with Mn-doped CdS quantum dot s...

Lu Liu; Miaoliang Huang; Zhang Lan

2014-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

Potential errors in conventional DOT measurement techniques in shake flasks and verification using a rotating flexitube optical sensor  

Science Journals Connector (OSTI)

Dissolved oxygen tension (DOT) is an important parameter for evaluating a bioprocess. Conventional means to measure DOT in shake flasks using fixed Clark-type electrodes immersed in the bulk liquid are problem...

Sven Hansen; Frank Kensy; Andreas Kser; Jochen Bchs

2011-05-01T23:59:59.000Z

222

Wildfire Policy in Transition Yellowstone  

E-Print Network [OSTI]

Wildfire Policy in Transition 1910 #12;Yellowstone 1988 #12;Colorado South Canyon Fire 1994 #12;#12;Wildfire Policy in Transition 1910 #12;

223

Transition-Metal Hydrides  

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

Transition-Metal Hydride Electrochromics Transition-Metal Hydride Electrochromics A new type of electrochromic hydride material has interesting and unusual properties. Thin Ni-Mg films, for example, are mirror-like in appearance and have very low visible transmittance. On exposure to hydrogen gas or on reduction in alkaline electrolyte, the films become transparent. The transition is believed to result from formation of nickel magnesium hydride, Mg2NiH4. Switchable mirrors based on rare earth hydrides were discovered in 1996 at Vrije University in the Netherlands, Rare earth-magnesium alloy films were subsequently found to be superior to the pure lanthanides in maximum transparency and mirror-state reflectivity by Philips Laboratories. The newer transition-metal types which use less expensive and less reactive materials were discovered at LBNL. This has now become a very active area of study with a network of researchers.

224

MATHEMATICS: RETHINKING THE TRANSITION  

E-Print Network [OSTI]

SENIOR SECONDARY MATHEMATICS: RETHINKING THE TRANSITION BILL BARTON THE UNIVERSITY OF AUCKLAND, NZ #12;THE ENVISIONING PROJECT · Mathematics education project of NZIMA (New Zealand Institute of Mathematics & Its Applications--the mathematics research funding body). · Brought together mathematics

Peters, Achim

225

Alternative fuel transit buses  

SciTech Connect (OSTI)

The National Renewable Energy Laboratory (NREL) is a U.S. Department of Energy (DOE) national laboratory; this project was funded by DOE. One of NREL`s missions is to objectively evaluate the performance, emissions, and operating costs of alternative fuel vehicles so fleet managers can make informed decisions when purchasing them. Alternative fuels have made greater inroads into the transit bus market than into any other. Each year, the American Public Transit Association (APTA) surveys its members on their inventory and buying plans. The latest APTA data show that about 4% of the 50,000 transit buses in its survey run on an alternative fuel. Furthermore, 1 in 5 of the new transit buses that members have on order are alternative fuel buses. This program was designed to comprehensively and objectively evaluate the alternative fuels in use in the industry.

Motta, R.; Norton, P.; Kelly, K. [and others

1996-10-01T23:59:59.000Z

226

Oligocyclopentadienyl transition metal complexes  

SciTech Connect (OSTI)

Synthesis, characterization, and reactivity studies of oligocyclopentadienyl transition metal complexes, namely those of fulvalene, tercyclopentadienyl, quatercyclopentadienyl, and pentacyclopentadienyl(cyclopentadienyl) are the subject of this account. Thermal-, photo-, and redox chemistries of homo- and heteropolynuclear complexes are described.

de Azevedo, Cristina G.; Vollhardt, K. Peter C.

2002-01-18T23:59:59.000Z

227

PHYSICAL REVIEW B 84, 205305 (2011) Spin-phonon coupling in single Mn-doped CdTe quantum dot  

E-Print Network [OSTI]

PHYSICAL REVIEW B 84, 205305 (2011) Spin-phonon coupling in single Mn-doped CdTe quantum dot C. L dynamics of a single Mn atom in a laser driven CdTe quantum dot is addressed theoretically. Recent of single Mn-doped CdTe dots, information about the quantum spin state of a single Mn atom is extracted from

Paris-Sud XI, Université de

228

Quantum Dots Monitor TrkA Receptor Dynamics in the Interior of Neural PC12 Cells  

Science Journals Connector (OSTI)

23 These TrkA vesicles are then loaded onto microtubule motor transport highways within the cell and shuttled to different subcellular sites for interaction with other signaling molecules. ... Limitations and potential future uses of quantum dot probes are also discussed. ... Tracking Individual Kinesin Motors in Living Cells Using Single Quantum-Dot Imaging ...

Sujata Sundara Rajan; Tania Q. Vu

2006-08-22T23:59:59.000Z

229

Photoluminescence beyond 1.5m from InAs quantum dots  

Science Journals Connector (OSTI)

Photoluminescence measurements were carried out to investigate the origin of long wavelength emissions (~1.6@mm at room temperature) observed from wafers with InAs quantum dots capped with GaAsSb layers. For wafers with high Sb content (22% and 26%) ... Keywords: Photoluminescence, Quantum dots, Type-II

J. S. Ng; H. Y. Liu; M. J. Steer; M. Hopkinson; J. P. R. David

2006-12-01T23:59:59.000Z

230

GaSb/GaAs type II quantum dot solar cells for enhanced infrared spectral response  

E-Print Network [OSTI]

GaSb/GaAs type II quantum dot solar cells for enhanced infrared spectral response R. B Technology Materials, University of New Mexico, 1313 Goddard SE, Albuquerque, New Mexico 87106 Received 27 infrared spectral response of GaAs-based solar cells that incorporate type II GaSb quantum dots QDs formed

Jalali. Bahram

231

Project Information Form Project Title White Paper on Climate Adaptation for State DOTs and Local Agencies  

E-Print Network [OSTI]

Project Information Form Project Title White Paper on Climate Adaptation for State DOTs and Local each agency or organization) DOT $30,000 Total Project Cost $30,000 Agency ID or Contract Number DTRT13-G-UTC29 Start and End Dates January 2014 to December 2014 Brief Description of Research Project

California at Davis, University of

232

2013 MnDOT Environmental Stewardship Workshop Transportation Program and Project Development in a Changing Environment  

E-Print Network [OSTI]

in a Changing Environment May 7, 2013 7:30 ­ 8:00 am REGISTRATION and CONTINENTAL BREAKFAST 8:00 ­ 8:15 am of Environmental Stewardship (OES), MnDOT Jon Chiglo, Director, Engineering Services Division, MnDOT 8:15 ­ 8:30 am will review the immediate repair efforts, emergency response coordination, fast track design & letting

Minnesota, University of

233

Evidence for formation of multi-quantum dots in hydrogenated graphene  

E-Print Network [OSTI]

Abstract We report the experimental evidence for the formation of multi-quantum dots in a hydrogenated single-layer graphene flake. The existence of multi-quantum dots is supported by the low-temperature measurements on a field effect transistor...

Chuang, Chiashain; Puddy, Reuben K; Connolly, Malcolm R; Lo, Shun-Tsung; Lin, Huang-De; Chen, Tse-Ming; Smith, Charles G; Liang, Chi-Te

2012-08-16T23:59:59.000Z

234

Light extraction analysis and enhancement in a quantum dot light emitting diode  

E-Print Network [OSTI]

Light extraction analysis and enhancement in a quantum dot light emitting diode Ruidong Zhu outcoupling and angular performance of quantum dot light emitting diode (QLED). To illustrate the design principles, we use a red QLED as an example and compare its performance with an organic light emitting diode

Wu, Shin-Tson

235

Photoluminescence Blinking Dynamics of Colloidal Quantum Dots in the Presence of Controlled External Electron Traps  

SciTech Connect (OSTI)

The effect of the external charge trap on the photoluminescence blinking dynamics of individual colloidal quantum dots is investigated with a series of colloidal quantum dot-bridge-fullerene dimers with varying bridge lengths, where the fullerene moiety acts as a well-defined, well-positioned external charge trap. It is found that charge transfer followed by charge recombination is an important mechanism in determining the blinking behavior of quantum dots when the external trap is properly coupled with the excited state of the quantum dot, leading to a quasi-continuous distribution of 'on' states and an early fall-off from a power-law distribution for both 'on' and 'off' times associated with quantum dot photoluminescence blinking.

Cotlet, M.; Xu, Z.

2012-01-23T23:59:59.000Z

236

Intermediate-band photosensitive device with quantum dots embedded in energy fence barrier  

DOE Patents [OSTI]

A plurality of layers of a first semiconductor material and a plurality of dots-in-a-fence barriers disposed in a stack between a first electrode and a second electrode. Each dots-in-a-fence barrier consists essentially of a plurality of quantum dots of a second semiconductor material embedded between and in direct contact with two layers of a third semiconductor material. Wave functions of the quantum dots overlap as at least one intermediate band. The layers of the third semiconductor material are arranged as tunneling barriers to require a first electron and/or a first hole in a layer of the first material to perform quantum mechanical tunneling to reach the second material within a respective quantum dot, and to require a second electron and/or a second hole in a layer of the first semiconductor material to perform quantum mechanical tunneling to reach another layer of the first semiconductor material.

Forrest, Stephen R. (Ann Arbor, MI); Wei, Guodan (Ann Arbor, MI)

2010-07-06T23:59:59.000Z

237

Electric Field effects on quantum correlations in semiconductor quantum dots  

E-Print Network [OSTI]

We study the effect of external electric bias on the quantum correlations in the array of optically excited coupled semiconductor quantum dots. The correlations are characterized by the quantum discord and concurrence and are observed using excitonic qubits. We employ the lower bound of concurrence for thermal density matrix at different temperatures. The effect of the F\\"orster interaction on correlations will be studied. Our theoretical model detects nonvanishing quantum discord when the electric field is on while concurrence dies, ensuring the existence of nonclassical correlations as measured by the quantum discord.

S. Shojaei; M. Mahdian; R. Yousefjani

2012-05-01T23:59:59.000Z

238

Photocurrent extraction efficiency in colloidal quantum dot photovoltaics  

SciTech Connect (OSTI)

The efficiency of photocurrent extraction was studied directly inside operating Colloidal Quantum Dot (CQD) photovoltaic devices. A model was derived from first principles for a thin film p-n junction with a linearly spatially dependent electric field. Using this model, we were able to clarify the origins of recent improvement in CQD solar cell performance. From current-voltage diode characteristics under 1 sun conditions, we extracted transport lengths ranging from 39 nm to 86 nm for these materials. Characterization of the intensity dependence of photocurrent extraction revealed that the dominant loss mechanism limiting the transport length is trap-mediated recombination.

Kemp, K. W.; Wong, C. T. O.; Hoogland, S. H.; Sargent, E. H. [Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4 (Canada)] [Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4 (Canada)

2013-11-18T23:59:59.000Z

239

Certificate in Transit Management and  

E-Print Network [OSTI]

Certificate in Transit Management and Operations UMass Transit, in partnership with the UMass Transportation Center and CTTransit, are pleased to offer "A Certificate in Transit Management and Operations Engineering and the School of Management - Internships with UMass Transit and CTTransit - A summer workshop

Massachusetts at Amherst, University of

240

Certificate in Transit Management and  

E-Print Network [OSTI]

Certificate in Transit Management and Operations UMass Transit, in partnership with the UMass Transportation Center and CTTransit, are pleased to offer "A Certificate in Transit Management and Operations contract to provide transit management services in Hartford and other cities in Connecticut. CTTRANSIT

Massachusetts at Amherst, University of

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


241

Exciton-exciton and exciton-phonon interactions in an interfacial GaAs quantum dot ensemble  

Science Journals Connector (OSTI)

Using optical two-dimensional Fourier transform spectroscopy, we report temperature- and excitation-density-dependent measurements of the homogeneous linewidth of the exciton ground-state transition in a single layer of interfacial GaAs quantum dots (QDs). We show that the homogeneous linewidth increases nonlinearly with temperature from 6 to 50 K and that the thermal broadening is well described by an activation term and offset. The absence of a phonon-activation peak in the two-dimensional spectra reveals that elastic scattering of excitons with acoustic phonons via virtual transitions between the ground and excited states significantly contributes to the thermal broadening. We find that the combination of increasing virtual activation energy and exciton-phonon coupling strength with decreasing QD size results in greater thermal broadening for excitons localized in smaller QDs. The homogeneous linewidth also exhibits a strong excitation-density dependence and is shown to increase linearly as the photon density increases from 21011 to 11012 photonspulse-1cm-2 at 6 K. This trend is attributed to strong coupling of excitons within the same QD and is independent of the quantum-well exciton population density.

G. Moody; M. E. Siemens; A. D. Bristow; X. Dai; D. Karaiskaj; A. S. Bracker; D. Gammon; S. T. Cundiff

2011-03-23T23:59:59.000Z

242

Real-time observation of nanoscale topological transitions in epitaxial PbTe/CdTe heterostructures  

SciTech Connect (OSTI)

The almost completely immiscible PbTe/CdTe heterostructure has recently become a prototype system for self-organized quantum dot formation based on solid-state phase separation. Here, we study by real-time transmission electron microscopy the topological transformations of two-dimensional PbTe-epilayers into, first, a quasi-one-dimensional percolation network and subsequently into zero-dimensional quantum dots. Finally, the dot size distribution coarsens by Ostwald ripening. The whole transformation sequence occurs during all stages in the fully coherent solid state by bulk diffusion. A model based on the numerical solution of the Cahn-Hilliard equation reproduces all relevant morphological and dynamic aspects of the experiments, demonstrating that this standard continuum approach applies to coherent solids down to nanometer dimensions. As the Cahn-Hilliard equation does not depend on atomistic details, the observed morphological transformations are general features of the model. To confirm the topological nature of the observed shape transitions, we developed a parameter-free geometric model. This, together with the Cahn-Hilliard approach, is in qualitative agreement with the experiments.

Groiss, H., E-mail: heiko.groiss@jku.at, E-mail: istvan.daruka@jku.at; Daruka, I., E-mail: heiko.groiss@jku.at, E-mail: istvan.daruka@jku.at; Springholz, G.; Schffler, F. [Institute of Semiconductor and Solid State Physics, Johannes Kepler University, Linz 4040 (Austria); Koike, K.; Yano, M. [Nanomaterials Microdevices Research Center, Osaka Institute of Technology, Asahi-ku Ohmiya, Osaka 535-8585 (Japan); Hesser, G. [Center for Surface- and Nanoanalytics (ZONA), Johannes Kepler University, Linz 4040 (Austria); Zakharov, N.; Werner, P. [Max Planck Institute of Microstructure Physics, Halle 06120 (Germany)

2014-01-01T23:59:59.000Z

243

Functionalized Silicone Nanospheres: Synthesis, Transition Metal...  

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

Functionalized Silicone Nanospheres: Synthesis, Transition Metal Immobilization, and Catalytic Applications. Functionalized Silicone Nanospheres: Synthesis, Transition Metal...

244

site_transition.cdr  

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

Legacy Legacy Management U.S. DEPARTMENT OF This fact sheet explains the process for transferring a site to the U.S. Department of Energy Office of Legacy Management. Site Transition Process Upon Cleanup Completion Introduction Transition Process After environmental remediation is completed at a site and there is no continuing mission, responsibility for the site and the associated records are transferred to the U.S. Department of Energy (DOE) Office of Legacy Management for post-closure management. Where residual hazards (e.g., disposal cells, ground water contamination) remain, active long-term surveillance and maintenance will be required to ensure protection of human health and the environment. The DOE Office of Legacy Management (LM) established transition guidance for remediated sites that will transfer to LM for long-term surveillance and maintenance. The

245

Viscosity near phase transitions  

E-Print Network [OSTI]

Probably the most enticing observation in theoretical physics during the last decade was the discovery of the great amount of consequences obtained from the AdS/CFT conjecture put forward by Maldacena. In this work we review how this correspondence can be used to address hydrodynamic properties such as the viscosity of some strongly interacting systems. We also employ the Boltzmann equation for those systems closer to low-energy QCD, and argue that this kind of transport coefficients can be related to phase transitions, in particular the QGP/hadronic phase transition studied in heavy ion collisions.

Antonio Dobado; Felipe J. Llanes-Estrada; Juan M. Torres-Rincon

2010-09-30T23:59:59.000Z

246

Ceramic wire and coil made of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} high-temperature superconductor with a critical current density up to 75 A {center_dot}cm{sup {minus}2} at 77 K  

SciTech Connect (OSTI)

Processing parameters are refined and a route is found for fabricating wires, coils, and other lengthy electrotechnical elements form high-temperature superconducting ceramic YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}. The superconducting transition temperature of around 90 K and a critical current density in the terrestrial magnetic field of 35-75 A {center_dot} cm{sup {minus}2} at 77 K characterize the performance of the wire.

Basalaeva, T.S.; Ordan`yan, S.S.; Polonskii, Y.A. [St. Petersburg State Technical Univ. (Russian Federation)] [and others

1995-03-20T23:59:59.000Z

247

Green synthesis of highly efficient CdSe quantum dots for quantum-dots-sensitized solar cells  

SciTech Connect (OSTI)

Green synthesis of CdSe quantum dots for application in the quantum-dots-sensitized solar cells (QDSCs) is investigated in this work. The CdSe QDs were prepared with glycerol as the solvent, with sharp emission peak, full width at half maximum around 30?nm, and absorption peak from 475?nm to 510?nm. The reaction is environmental friendly and energy saving. What's more, the green synthesized CdSe QDs are coherence to the maximum remittance region of the solar spectrum and suitable as sensitizers to assemble onto TiO{sub 2} electrodes for cell devices application. What's more, the dynamic procedure of the carriers' excitation, transportation, and recombination in the QDSCs are discussed. Because the recombination of the electrons from the conduction band of TiO{sub 2}'s to the electrolyte affects the efficiency of the solar cells greatly, 3-Mercaptopropionic acid capped water-dispersible QDs were used to cover the surface of TiO{sub 2}. The resulting green synthesized CdSe QDSCs with Cu{sub 2}S as the electrode show a photovoltaic performance with a conversion efficiency of 3.39%.

Gao, Bing; Shen, Chao; Zhang, Mengya; Yuan, Shuanglong; Yang, Yunxia, E-mail: yangyunxia@ecust.edu.cn, E-mail: grchen@ecust.edu.cn; Chen, Guorong, E-mail: yangyunxia@ecust.edu.cn, E-mail: grchen@ecust.edu.cn [Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237 (China); Zhang, Bo [Department of Physics, East China University of Science and Technology, Shanghai 200237 (China)

2014-05-21T23:59:59.000Z

248

Transition Implementation Guide  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

This Guide was prepared to aid in the development, planning, and implementation of requirements and activities during the transition phase at Department of Energy (DOE) facilities that have been declared or are forecast to become excess to any future mission requirements.

2001-04-24T23:59:59.000Z

249

Variational transition state theory  

SciTech Connect (OSTI)

This research program involves the development of variational transition state theory (VTST) and semiclassical tunneling methods for the calculation of gas-phase reaction rates and selected applications. The applications are selected for their fundamental interest and/or their relevance to combustion.

Truhlar, D.G. [Univ. of Minnesota, Minneapolis (United States)

1993-12-01T23:59:59.000Z

250

Gates controlled parallel-coupled double quantum dot on both single layer and bilayer graphene  

E-Print Network [OSTI]

Here we report the fabrication and quantum transport measurements of gates controlled parallel-coupled double quantum dot on both bilayer and single layer graphene. It is shown that the interdot coupling strength of the parallel double dots can be effectively tuned from weak to strong regime by both the in-plane plunger gates and back gate. All the relevant energy scales and parameters of the graphene parallel-coupled double dot can be extracted from the honeycomb charge stability diagrams revealed through the transport measurements.

Lin-Jun Wang; Guo-Ping Guo; Da Wei; Gang Cao; Tao Tu; Ming Xiao; Guang-Can Guo; A. M. Chang

2011-04-22T23:59:59.000Z

251

Growth and optical characterization of multilayers of InGaN quantum dots  

E-Print Network [OSTI]

GaN quantum dots Article Type: Research Paper Section/Category: General subjects Keywords: B2. InGaN quantum dots; A1. Photoluminescence; B1. Nitrides; A3. Metal-organic vapour phase epitaxy Corresponding Author: Dr Tongtong Zhu, Ph... , Cambridge, CB2 3QZ, UK Dr Tongtong Zhu Tel: +44 1223 334368 Fax: +44 1223 334437 E-mail: tz234@cam.ac.uk 9 Sep 2011 Dear Editor, Title: Growth and optical characterization of multilayers of InGaN quantum dots Authors: Tongtong Zhu, Haitham A...

Zhu, Tontong; El-Ella, Haitham; Reid, Benjamin; Holmes, Mark; Taylor, Robert; Kappers, Menno; Oliver, Rachel

2012-01-01T23:59:59.000Z

252

Quantum interference in exciton-Mn spin interactions in a CdTe semiconductor quantum dot  

E-Print Network [OSTI]

We show theoretically and experimentally the existence of a new quantum interference(QI) effect between the electron-hole interactions and the scattering by a single Mn impurity. Theoretical model, including electron-valence hole correlations, the short and long range exchange interaction of Mn ion with the heavy hole and with electron and anisotropy of the quantum dot, is compared with photoluminescence spectroscopy of CdTe dots with single magnetic ions. We show how design of the electronic levels of a quantum dot enable the design of an exciton, control of the quantum interference and hence engineering of light-Mn interaction.

Trojnar, A; Kadantsev, E; Hawrylak, P; Goryca, M; Kazimierczuk, T; Kossacki, P; Wojnar, P; Potemski, M

2011-01-01T23:59:59.000Z

253

Quantum interference in exciton-Mn spin interactions in a CdTe semiconductor quantum dot  

E-Print Network [OSTI]

We show theoretically and experimentally the existence of a new quantum interference(QI) effect between the electron-hole interactions and the scattering by a single Mn impurity. Theoretical model, including electron-valence hole correlations, the short and long range exchange interaction of Mn ion with the heavy hole and with electron and anisotropy of the quantum dot, is compared with photoluminescence spectroscopy of CdTe dots with single magnetic ions. We show how design of the electronic levels of a quantum dot enable the design of an exciton, control of the quantum interference and hence engineering of light-Mn interaction.

A. Trojnar; M. Korkusinski; E. Kadantsev; P. Hawrylak; M. Goryca; T. Kazimierczuk; P. Kossacki; P. Wojnar; M. Potemski

2011-05-04T23:59:59.000Z

254

Far off-resonant coupling between photonic crystal microcavity and single quantum dot with resonant excitation  

SciTech Connect (OSTI)

In this paper, we experimentally demonstrate that with sub-nanowatt coherent s-shell excitation of a single InAs quantum dot, off-resonant coupling of 4.1?nm is possible between L3 photonic crystal microcavity and the quantum dot at 50?K. This resonant excitation reduces strongly the effect of surrounding charges to quantum dot, multiexciton complexes and pure dephasing. It seems that this far off-resonant coupling is the result of increased number of acoustical phonons due to high operating temperature of 50?K. The 4.1?nm detuning is the largest amount for this kind of coupling.

Banihashemi, Mehdi; Ahmadi, Vahid, E-mail: v-ahmadi@modares.ac.ir [Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, P.O. Box 14115-194 (Iran, Islamic Republic of)] [Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, P.O. Box 14115-194 (Iran, Islamic Republic of); Nakamura, Tatsuya; Kojima, Takanori; Kojima, Kazunobu; Noda, Susumu [Department of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510 (Japan)] [Department of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510 (Japan)

2013-12-16T23:59:59.000Z

255

Electronic structure, morphology and emission polarization of enhanced symmetry InAs quantum-dot-like structures grown on InP substrates by molecular beam epitaxy  

SciTech Connect (OSTI)

The optical and structural properties of a new kind of InAs/InGaAlAs/InP quantum dot (QD)-like objects grown by molecular beam epitaxy have been investigated. These nanostructures were found to have significantly more symmetrical shapes compared to the commonly obtained dash-like geometries typical of this material system. The enhanced symmetry has been achieved due to the use of an As{sub 2} source and the consequent shorter migration length of the indium atoms. Structural studies based on a combination of scanning transmission electron microscopy (STEM) and atom probe tomography (APT) provided detailed information on both the structure and composition distribution within an individual nanostructure. However, it was not possible to determine the lateral aspect ratio from STEM or APT. To verify the in-plane geometry, electronic structure calculations, including the energy levels and transition oscillator strength for the QDs have been performed using an eight-band kp model and realistic system parameters. The results of calculations were compared to measured polarization-resolved photoluminescence data. On the basis of measured degree of linear polarization of the surface emission, the in-plane shape of the QDs has been assessed proving a substantial increase in lateral symmetry. This results in quantum-dot rather than quantum-dash like properties, consistent with expectations based on the growth conditions and the structural data.

Mary?ski, A.; S?k, G.; Musia?, A.; Andrzejewski, J.; Misiewicz, J. [Institute of Physics, Wroc?aw University of Technology, Wybrze?e Wyspia?skiego 27, 50-370 Wroc?aw (Poland)] [Institute of Physics, Wroc?aw University of Technology, Wybrze?e Wyspia?skiego 27, 50-370 Wroc?aw (Poland); Gilfert, C.; Reithmaier, J. P. [Technische Physik, Institute of Nanostructure Technology and Analytics, CINSaT, University of Kassel, Heinrich Plett-Str. 40, D-34132 Kassel (Germany)] [Technische Physik, Institute of Nanostructure Technology and Analytics, CINSaT, University of Kassel, Heinrich Plett-Str. 40, D-34132 Kassel (Germany); Capua, A.; Karni, O.; Gready, D.; Eisenstein, G. [Department of Electrical Engineering, Technion, Haifa 32000 (Israel)] [Department of Electrical Engineering, Technion, Haifa 32000 (Israel); Atiya, G.; Kaplan, W. D. [Department of Materials Science and Engineering, Technion, Haifa 32000 (Israel)] [Department of Materials Science and Engineering, Technion, Haifa 32000 (Israel); Klling, S. [Fraunhofer Institute for Photonic Microsystems, Center for Nanoelectronic Technologies, Knigsbrcker Strae 180, D-01099 Dresden (Germany)] [Fraunhofer Institute for Photonic Microsystems, Center for Nanoelectronic Technologies, Knigsbrcker Strae 180, D-01099 Dresden (Germany)

2013-09-07T23:59:59.000Z

256

Ultra-low density InAs quantum dots  

SciTech Connect (OSTI)

We show that InAs quantum dots (QDs) can be grown by molecular beam epitaxy (MBE) with an ultralow density of sin 10{sup 7} cm{sup -2} without any preliminary or post-growth surface treatment. The strain-induced QD formation proceeds via the standard Stranski-Krastanow mechanism, where the InAs coverage is decreased to 1.3-1.5 monolayers (MLs). By using off-cut GaAs (100) substrates, we facilitate the island nucleation in this subcritical coverage range without any growth interruption. The QD density dependences on the InAs coverage are studied by photoluminescence, atomic force microscopy, transmission electron microscopy, and are well reproduced by the universal double exponential shapes. This method enables the fabrication of InAs QDs with controllable density in the range 10{sup 7}-10{sup 8} cm{sup -2}, exhibiting bright photoluminescence.

Dubrovskii, V. G., E-mail: dubrovskii@mail.ioffe.ru; Cirlin, G. E. [St. Petersburg Academic University Russian Academy of Sciences (Russian Federation)] [St. Petersburg Academic University Russian Academy of Sciences (Russian Federation); Brunkov, P. A. [Ioffe Physical Technical Institute Russian Academy of Sciences (Russian Federation)] [Ioffe Physical Technical Institute Russian Academy of Sciences (Russian Federation); Perimetti, U.; Akopyan, N. [Delft University of Technology, Quantum Transport, Kavli Institute of Nanoscience (Netherlands)] [Delft University of Technology, Quantum Transport, Kavli Institute of Nanoscience (Netherlands)

2013-10-15T23:59:59.000Z

257

Electric-field-induced spin depolarization in graphene quantum dots  

Science Journals Connector (OSTI)

We study the effect of the in-plane electric field on the magnetic properties of charge-neutral triangular zigzag graphene quantum dot (GQD) by using the mean-field Hubbard Hamiltonian. Our calculated results show that spin depolarization begins to occur when the electric field is beyond some critical value. The spin-density distribution is more concentrated in the region of the GQDs with smaller electrostatic potential. This phenomenon is attributed to the competition between the many-body electron-electron interaction and the external electrostatic potential. Numerical results also show that the total spin of larger GQDs are easier to depolarize than the total spin of smaller GQDs. Moreover, the spin of GQDs with weak edge disorder still respond to an electric field but in a more irregular way. Our findings provide a path to electrically tuning the magnetic properties of GQDs.

Wen-Long Ma and Shu-Shen Li

2012-07-30T23:59:59.000Z

258

Valley pair qubits in double quantum dots of gapped graphene  

E-Print Network [OSTI]

The rise of graphene opens a new door to qubit implementation, as discussed in the recent proposal of valley pair qubits in double quantum dots of gapped graphene (Wu et al., arXiv: 1104.0443 [cond-mat.mes-hall]). The work here presents the comprehensive theory underlying the proposal. It discusses the interaction of electrons with external magnetic and electric fields in such structures. Specifically, it examines a strong, unique mechanism, i.e., the analogue of the 1st-order relativistic effect in gapped graphene. This mechanism is state mixing free and allows, together with the electrically tunable exchange coupling, a fast, all-electric manipulation of qubits via electric gates, in the time scale of ns. The work also looks into the issue of fault tolerance in a typical case, yielding at 10oK a long qubit coherence time (~O(ms)).

G. Y. Wu; N. -Y. Lue; L. Chang

2011-07-03T23:59:59.000Z

259

Fluorescence quenching of CdSe quantum dots on graphene  

SciTech Connect (OSTI)

We studied systematically the fluorescence quenching of CdSe quantum dots (QDs) on graphene and its multilayers, as well as graphene oxide (GO) and reduced graphene oxide (rGO). Raman intensity of QDs was used as a quantitatively measurement of its concentration in order to achieve a reliable quenching factor (QF). It was found that the QF of graphene (?13.1) and its multilayers is much larger than rGO (?4.4), while GO (?1.5) has the lowest quenching efficiency, which suggests that the graphitic structure is an important factor for quenching the fluorescence of QDs. It was also revealed that the QF of graphene is not strongly dependent on its thicknesses.

Guo, Xi Tao; Hua Ni, Zhen, E-mail: zhni@seu.edu.cn; Yan Nan, Hai; Hui Wang, Wen [Department of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 211189 (China)] [Department of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 211189 (China); Yan Liao, Chun [Physics Department, National Photoelectric Technology and Functional Materials and Application of Science and Technology International Cooperation Base, Northwest University, Xi'an 710069 (China)] [Physics Department, National Photoelectric Technology and Functional Materials and Application of Science and Technology International Cooperation Base, Northwest University, Xi'an 710069 (China); Zhang, Yan; Wei Zhao, Wei [Jiangsu Key Laboratory for Design and Fabrication of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189 (China)] [Jiangsu Key Laboratory for Design and Fabrication of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189 (China)

2013-11-11T23:59:59.000Z

260

Experimental verification of Frster energy transfer between semiconductor quantum dots  

Science Journals Connector (OSTI)

In recent years, energy transfer (ET) using semiconductor quantum dots (QDs) is getting increased attention. However, it has been postulated that ET between QDs is based on the Frster model, which is a well-established model of ET mechanism in organic dye systems, without verification. In this work, we have investigated ET mechanism in colloidal CdS QDs measuring photoluminescence dynamics of a bilayer structure consisting of differently sized CdS QDs. In the bilayer structure, the distance between the monolayer of donor QDs and that of acceptor QDs was controlled precisely by a spacer layer that is layer-by-layer assembly of polyelectrolytes. The bilayer structure enabled us to systematically measure the spacer-layer dependence of photoluminescence dynamics reflecting the ET process between QDs. It is demonstrated that ET between the donor and acceptor QDs is conclusively dominated by the dipole-dipole interaction, which verifies the appropriateness of the Frster model.

DaeGwi Kim; Shinya Okahara; Masaaki Nakayama; YongGu Shim

2008-10-02T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

Quantum dots in bio-imaging: Revolution by the small  

SciTech Connect (OSTI)

Visual analysis of biomolecules is an integral avenue of basic and applied biological research. It has been widely carried out by tagging of nucleotides and proteins with traditional fluorophores that are limited in their application by features such as photobleaching, spectral overlaps, and operational difficulties. Quantum dots (QDs) are emerging as a superior alternative and are poised to change the world of bio-imaging and further its applications in basic and applied biology. The interdisciplinary field of nanobiotechnology is experiencing a revolution and QDs as an enabling technology have become a harbinger of this hybrid field. Within a decade, research on QDs has evolved from being a pure science subject to the one with high-end commercial applications.

Arya, Harinder [Gene Function Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 (Japan); Kaul, Zeenia [Gene Function Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 (Japan); Wadhwa, Renu [Gene Function Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 (Japan); Taira, Kazunari [Gene Function Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 (Japan); Hirano, Takashi [Institute for Biological Resources and Functions, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, 7 Ibaraki 305-8562 (Japan); Kaul, Sunil C. [Gene Function Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 (Japan)]. E-mail: s-kaul@aist.go.jp

2005-04-22T23:59:59.000Z

262

FE Transition Deliverables  

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

Transition Deliverables Transition Deliverables To: Cynthia Quarterman From: Charles Roy, FE-3 Date: 12/04/08 Re: On 12/03/08 Cynthia Quarterman requested a list of major projects with quick starts and job creation from Vic Der. Attached is a hard copy of this document. An electronic version of this document will be submitted to Cynthia Quarterman through the Office of Management. If there are any questions, please contact Charles Roy at 202-586-8977. ,^ (^// Cc~y Major Projects with Quick Starts & Jobs Creation Office of Clean Coal Summary of Projects and Job Creation The following table outlines the near-term possibilities for projects that capture and sequester carbon from coal-based systems. The potential jobs associated with these activities are listed along with likely construction and operation dates. Since the funding

263

Alternative Fuel Transit Buses  

Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

35th St. Craig Ave. Alt Blvd. Colucci Pkwy. Final Results from the National Renewable Energy Laboratory Vehicle Evaluation Program Final Results from the National Renewable Energy Laboratory Vehicle Evaluation Program N T Y A U E O F E N E R G D E P A R T M E N I T E D S T A T S O F A E R I C M Produced for the U.S. Department of Energy (DOE) by the National Renewable Energy Laboratory (NREL), a U.S. DOE national laboratory Transit Buses Alternative Fuel Alternative Fuel Final Results from the National Renewable Energy Laboratory (NREL) Vehicle Evaluation Program by Robert Motta, Paul Norton, and Kenneth Kelly, NREL Kevin Chandler, Battelle Leon Schumacher, University of Missouri Nigel Clark,West Virginia University October 1996 The authors wish to thank all the transit agencies that participated in this program.

264

Argonne CNM Highlight: Coupling of Single Quantum Dots to Smooth Metal  

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

Coupling of Single Quantum Dots to Smooth Metal Films Single Quantum Dots Coupledl to Smooth Metal Films Artist¹s rendition of semiconductor nanocrystals near a gold film. The metal increases nanocrystal emission rates depending on their orientation. [selected as cover image for Phys. Chem. Chem. Phys., 11, 5853 (2009)] Staff in the CNM Nanophotonics Group have measured how light emission from individual colloidal semiconductor nanocrystals, or quantum dots, is modified when in proximity to smooth metal films. Metal nanostructures can strongly modify how quantum dots emit light because of their coupling to electron oscillations in the metal, known as surface plasmons. Emission modification is important for the improvement of light-emitting devices,

265

Optimization of a microwave resonator cavity to perform electron spin resonance measurements on quantum dots  

E-Print Network [OSTI]

This thesis attempts to improve on an ongoing experiment of detecting electron spin resonance (ESR) on AlGaAs/GaAs lateral quantum dots. The experiment is performed in a 2.5 Tesla magnetic field at temperatures around ...

Burger, Anat

2006-01-01T23:59:59.000Z

266

Efficient light emitting devices utilizing CdSe(ZnS) quantum dots in organic host matrices  

E-Print Network [OSTI]

We demonstrate efficient electroluminescence from thin film structures containing core-shell CdSe(ZnS) quantum dots dispersed in molecular organic host materials. In the most efficient devices, excitons are created on the ...

Coe-Sullivan, Seth (Seth Alexander)

2002-01-01T23:59:59.000Z

267

Optimal tunneling enhances the quantum photovoltaic effect in double quantum dots  

E-Print Network [OSTI]

We investigate the quantum photovoltaic effect in double quantum dots by applying the nonequilibrium quantum master equation. A drastic suppression of the photovoltaic current is observed near the open circuit voltage, ...

Wang, Chen

268

Two-Photon Oxygen Sensing with Quantum Dot-Porphyrin Conjugates  

E-Print Network [OSTI]

Supramolecular assemblies of a quantum dot (QD) associated to palladium(II) porphyrins have been developed to detect oxygen (pO[subscript 2]) in organic solvents. Palladium porphyrins are sensitive in the 0160 Torr range, ...

Lemon, Christopher M.

269

Enhance energy transfer between quantum dots by the surface plasmon of Ag island film  

Science Journals Connector (OSTI)

We observed enhanced energy transfer between quantum dots which were spin coated on the surface of Ag island film. By adjusting the thickness of Al2O3 spacer...

Xu, Hui; Liu, Jiaming; Duan, Xiaoyu; Li, Jiahua; Xue, Jiancai; Sun, Xiye; Cai, Yefan; Zhou, Zhang-Kai; Wang, Xuehua

2014-01-01T23:59:59.000Z

270

Quantum Dots Promise to Significantly Boost Solar Cell Efficiencies (Fact Sheet)  

SciTech Connect (OSTI)

In the search for a third generation of solar-cell technologies, a leading candidate is the use of 'quantum dots' -- tiny spheres of semiconductor material measuring only about 2-10 billionths of a meter in diameter. Quantum dots have the potential to dramatically increase the efficiency of converting sunlight into energy -- perhaps even doubling it in some devices -- because of their ability to generate more than one bound electron-hole pair, or exciton, per incoming photon. NREL has produced quantum dots using colloidal suspensions; then, using molecular self-assembly, they have been fabricated into the first-ever quantum-dot solar cells. While these devices operate with only 4.4% efficiency, they demonstrate the capability for low-cost manufacturing.

Not Available

2013-08-01T23:59:59.000Z

271

Fiber-based cryogenic and time-resolved spectroscopy of PbS quantum dots  

E-Print Network [OSTI]

PbS quantum dots are promising active emitters for use with high-quality Si nanophotonic devices in the telecommunications-band. Measurements of low quantum dot densities are limited both because of low fluorescence levels and the challenges of single photon detection at these wavelengths. Here, we report on methods using a fiber taper waveguide to efficiently extract PbS quantum dot photoluminescence. Temperature dependent ensemble measurements reveal an increase in emitted photons concomitant with an increase in excited-state lifetime from 58.9 ns at 293 K to 657 ns at 40 K. Measurements are also performed on quantum dots on high-$Q$ ($>10^5$) microdisks using cavity-resonant, pulsed excitation.

Matthew T. Rakher; Ranojoy Bose; Chee Wei Wong; Kartik Srinivasan

2010-12-01T23:59:59.000Z

272

Luminescent, quantum dot-based anti-reflective coatings for crystalline silicon photovoltaics  

E-Print Network [OSTI]

This thesis demonstrates and evaluates the potential application of luminescent quantum dot/polymer solutions on crystalline silicon photovoltaics. After spin coating the QD/polymer onto silicon photodiodes, an increase ...

Bruer, Garrett (Garrett A.)

2010-01-01T23:59:59.000Z

273

Composite system based on CdSe/ZnS quantum dots and GaAs nanowires  

SciTech Connect (OSTI)

The possibility of fabricating a composite system based on colloidal CdSe/ZnS quantum dots and GaAs nanowires is demonstrated and the structural and emission properties of this system are investigated by electron microscopy and photoluminescence spectroscopy techniques. The good wettability and developed surface of the nanowire array lead to an increase in the surface density of quantum dots and, as a consequence, in the luminosity of the system in the 600-nm wavelength region. The photoluminescence spectrum of the quantum dots exhibits good temperature stability in the entire range 10-295 K. The impact of surface states on energy relaxation and the role of exciton states in radiative recombination in the quantum dots are discussed.

Khrebtov, A. I. [St. Petersburg Academic University-Nanotechnology Research and Education Center, Russian Academy of Sciences (Russian Federation)] [St. Petersburg Academic University-Nanotechnology Research and Education Center, Russian Academy of Sciences (Russian Federation); Talalaev, V. G. [St. Petersburg State University, Fock Institute of Physics (Russian Federation)] [St. Petersburg State University, Fock Institute of Physics (Russian Federation); Werner, P. [Max-Planck-Institut fuer Mikrostukturphysik (Germany)] [Max-Planck-Institut fuer Mikrostukturphysik (Germany); Danilov, V. V. [Vavilov State Optical Institute (Russian Federation)] [Vavilov State Optical Institute (Russian Federation); Artemyev, M. V. [Belarussian State University, Institute for Physicochemical Problems (Belarus)] [Belarussian State University, Institute for Physicochemical Problems (Belarus); Novikov, B. V. [St. Petersburg State University, Fock Institute of Physics (Russian Federation)] [St. Petersburg State University, Fock Institute of Physics (Russian Federation); Shtrom, I. V. [St. Petersburg Academic University-Nanotechnology Research and Education Center, Russian Academy of Sciences (Russian Federation)] [St. Petersburg Academic University-Nanotechnology Research and Education Center, Russian Academy of Sciences (Russian Federation); Panfutova, A. S. [Vavilov State Optical Institute (Russian Federation)] [Vavilov State Optical Institute (Russian Federation); Cirlin, G. E. [St. Petersburg Academic University-Nanotechnology Research and Education Center, Russian Academy of Sciences (Russian Federation)] [St. Petersburg Academic University-Nanotechnology Research and Education Center, Russian Academy of Sciences (Russian Federation)

2013-10-15T23:59:59.000Z

274

Ligand Mediated Surface Reconstruction of Photoluminescent CdTe Quantum Dots.  

E-Print Network [OSTI]

??Enhancement of photoluminescence (PL) is observed for light-shielded dodecylamine-capped colloidal CdTe quantum dots (CdTe/DDA QDs) dispersed in toluene after washing and recapping. The PL quantum (more)

Onnink, A.J.

2013-01-01T23:59:59.000Z

275

Compact biocompatible quantum dots via RAFT-mediated synthesis of imidazole-based random copolymer ligand  

E-Print Network [OSTI]

We present a new class of polymeric ligands for quantum dot (QD) water solubilization to yield biocompatible and derivatizable QDs with compact size (10?12 nm diameter), high quantum yields (>50%), excellent stability ...

Liu, Wenhao

276

Colloidal quantum-dot light-emitting diodes with metal-oxide charge  

E-Print Network [OSTI]

across the pixel area, and fabrication required the specialized deposition technique of energy-neutral over previously reported structures8,10 . Previous efforts at building colloidal quantum-dot (QD) LEDs concentrations and energy-band

277

DOT imaging of the developing brain: A validation study against functional MRI  

Science Journals Connector (OSTI)

In this work, we present a subject-matched comparison between fcDOT and fcMRI maps obtained in a cohort of full-term neonates. Our results demonstrate the potential of functional...

Ferradal, Silvina L; Liao, Steve M; Eggebrecht, Adam T; Shimony, Joshua; Inder, Terrie E; Culver, Joseph P; Smyser, Christopher D

278

Determination of energy scales in few-electron double quantum dots  

SciTech Connect (OSTI)

The capacitive couplings between gate-defined quantum dots and their gates vary considerably as a function of applied gate voltages. The conversion between gate voltages and the relevant energy scales is usually performed in a regime of rather symmetric dot-lead tunnel couplings strong enough to allow direct transport measurements. Unfortunately, this standard procedure fails for weak and possibly asymmetric tunnel couplings, often the case in realistic devices. We have developed methods to determine the gate voltage to energy conversion accurately in the different regimes of dot-lead tunnel couplings and demonstrate strong variations of the conversion factors. Our concepts can easily be extended to triple quantum dots or even larger arrays.

Taubert, D.; Ludwig, S. [Center for NanoScience and Fakultaet fuer Physik, Ludwig-Maximilians-Universitaet Muenchen, Geschwister-Scholl-Platz 1, D-80539 Muenchen (Germany); Schuh, D. [Institut fuer Experimentelle Physik, Universitaet Regensburg, D-93040 Regensburg (Germany); Wegscheider, W. [Laboratory for Solid State Physics, ETH Zuerich, CH-8093 Zuerich (Switzerland)

2011-12-15T23:59:59.000Z

279

Electrical excitation of colloidally synthesized quantum dots in metal oxide structures  

E-Print Network [OSTI]

This thesis develops methods for integrating colloidally synthesized quantum dots (QDs) and metal oxides in optoelectronic devices, presents three distinct light emitting devices (LEDs) with metal oxides surrounding a QD ...

Wood, Vanessa Claire

2010-01-01T23:59:59.000Z

280

Light extraction analysis and enhancement in a quantum dot light emitting diode  

Science Journals Connector (OSTI)

We apply a rigorous dipole model to analyze the light outcoupling and angular performance of quantum dot light emitting diode (QLED). To illustrate the design principles, we use a red...

Zhu, Ruidong; Luo, Zhenyue; Wu, Shin-Tson

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

CSS and Complete Streets Partnering with Mn/DOT for Complete Streets  

E-Print Network [OSTI]

Examples #12;·! Interrelated conditions in which something exists ·! Tying parts together to work Initiative: Seeks to integrate CSS in Mn/DOT as a business model to improve our processes and to balance

Minnesota, University of

282

Developing an array of site-controlled pyramidal quantum dots emitting polarization-entangled photons  

SciTech Connect (OSTI)

We present a site-controlled, highly symmetric quantum dot system with a density of at least 15 % of polarization-entangled photon emitters. Fidelity values of the entangled state as high as 0.7210.043 were found.

Juska, G.; Dimastrodonato, V.; Mereni, L. O.; Gocalinska, A.; Pelucchi, E. [Tyndall National Institute, University College Cork, Lee Maltings, Cork (Ireland)

2013-12-04T23:59:59.000Z

283

Time Resolved Single Molecule Spectroscopy of Semiconductor Quantum Dot/conjugated Organic Hybrid Nanostructures.  

E-Print Network [OSTI]

??Single molecule studies on CdSe quantum dots functionalized with oligo-phenylene vinylene ligands (CdSe-OPV) provide evidence of strong electronic communication that facilitate charge and energy transport (more)

Odoi, Michael Yemoh

2010-01-01T23:59:59.000Z

284

Solar Cells Based on Inks of n-Type Colloidal Quantum Dots  

Science Journals Connector (OSTI)

Solar Cells Based on Inks of n-Type Colloidal Quantum Dots ... Department of Electrical and Computer Engineering, University of Toronto, 10 Kings College Road, Toronto, Ontario M5S 3G4, Canada ...

Zhijun Ning; Haopeng Dong; Qiong Zhang; Oleksandr Voznyy; Edward H. Sargent

2014-09-16T23:59:59.000Z

285

Formation of graphene quantum dots by Planting hydrogen atoms at a graphene nanoribbon  

Science Journals Connector (OSTI)

Different technological approaches for creating graphene quantum dots by the adsorption of hydrogen ... occur both at convex portions of a distorted graphene nanoribbon and in the structure formed by two distorte...

L. A. Chernozatonskii; A. A. Artyukh; D. G. Kvashnin

2012-05-01T23:59:59.000Z

286

Transition of Sites from Environmental Management Memorandum...  

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

Transition of Sites from Environmental Management Memorandum of Understanding Transition of Sites from Environmental Management Memorandum of Understanding Transition of Sites from...

287

Quantum DotBridgeFullerene Heterodimers with Controlled Photoinduced Electron Transfer  

SciTech Connect (OSTI)

A series of donor-bridge-acceptor systems in the form of core/shell CdSe/ZnS quantum dot-bridge-fullerene heterodimers (see picture) with varying bridge length and varying quantum dot size were self-assembled by a surface-based stepwise method to demonstrate control of the rate and of the magnitude of fluctuations of photoinduced electron transfer at the single-molecule level.

Cotlet, M.; Xu, Z.

2011-06-27T23:59:59.000Z

288

(In,Mn)As quantum dots: Molecular-beam epitaxy and optical properties  

SciTech Connect (OSTI)

Self-assembled (In,Mn)As quantum dots are synthesized by molecular-beam epitaxy on GaAs (001) substrates. The experimental results obtained by transmission electron microscopy show that doping of the central part of the quantum dots with Mn does not bring about the formation of structural defects. The optical properties of the samples, including those in external magnetic fields, are studied.

Bouravleuv, A. D., E-mail: bour@mail.ioffe.ru; Nevedomskii, V. N. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)] [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation); Ubyivovk, E. V. [St. Petersburg State University (Russian Federation)] [St. Petersburg State University (Russian Federation); Sapega, V. F. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)] [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation); Khrebtov, A. I. [St. Petersburg Academic University, Nanotechnology Research and Education Centre (Russian Federation)] [St. Petersburg Academic University, Nanotechnology Research and Education Centre (Russian Federation); Samsonenko, Yu. B.; Cirlin, G. E.; Ustinov, V. M. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)] [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)

2013-08-15T23:59:59.000Z

289

SUNY/Buffalo Developing High-Efficiency Colloidal Quantum Dot Phosphors  

Broader source: Energy.gov [DOE]

The State University of New York at Buffalo is working to reduce the cost and increase the performance of LEDs for general illumination by developing high-efficiency colloidal quantum dot phosphors to replace conventional phosphors (i.e., those placed directly on the chip). Colloidal quantum dot phosphors are nanocrystal emitters and contain no rare-earth elements. What's more, it's possible to tune the emission wavelength merely by changing their size.

290

Analytical and numerical calculations of spectral and optical characteristics of spheroidal quantum dots  

SciTech Connect (OSTI)

In the effective mass approximation for electronic (hole) states of a spheroidal quantum dot with and without external fields the perturbation theory schemes are constructed in the framework of the Kantorovich and adiabatic methods. The eigenvalues and eigenfunctions of the problem, obtained in both analytical and numerical forms, were applied for the analysis of spectral and optical characteristics of spheroidal quantum dots in homogeneous electric fields.

Gusev, A. A., E-mail: gooseff@jinr.ru; Hai, L. L.; Vinitsky, S. I.; Chuluunbaatar, O. [Joint Institute for Nuclear Research (Russian Federation)] [Joint Institute for Nuclear Research (Russian Federation); Derbov, V. L.; Klombotskaya, A. S. [Saratov State University (Russian Federation)] [Saratov State University (Russian Federation); Dvoyan, K. G.; Sarkisyan, H. A. [Russian-Armenian (Slavonic) University (Armenia)] [Russian-Armenian (Slavonic) University (Armenia)

2013-08-15T23:59:59.000Z

291

Probing semiconductor quantum dot state and manipulation with superconducting transmission line resonator  

E-Print Network [OSTI]

A coupled system of a superconducting transmission line resonator with a semiconductor double quantum dot is analyzed. We simulate the phase shift of the microwave signal in the resonator, which is sensitive to the quantum dot qubit state and manipulation. The measurement quality is sufficiently high and the results demonstrate a solid-state quantum processor based on this type of circuit can be envisioned.

Zhe Guan

2013-12-08T23:59:59.000Z

292

Alameda-Contra Costa Transit District (AC Transit) Fuel Cell Transit Buses: Preliminary Evaluation Results  

SciTech Connect (OSTI)

This report provides an evaluation of three prototype fuel cell-powered transit buses operating at AC Transit in Oakland, California, and six baseline diesel buses similar in design to the fuel cell buses.

Chandler, K.; Eudy, L.

2007-03-01T23:59:59.000Z

293

Alameda-Contra Costa Transit District (AC Transit) Fuel Cell Transit Buses: Preliminary Evaluation Results  

Broader source: Energy.gov [DOE]

This report provides an evaluation of three prototype fuel cell-powered transit buses operating at AC Transit in Oakland, California, and six baseline diesel buses similar in design to the fuel cell buses.

294

Concerted Allosteric Transition Highlight  

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

combined use of x-ray crystallography and solution small angle x-ray scattering has enabled a research collaboration involving scientists from Boston College and SSRL to provide structural evidence supporting a 30-year old model accounting for the cooperative binding of ligands to allosteric proteins and enzymes - a function central to physiology and cellular processes. combined use of x-ray crystallography and solution small angle x-ray scattering has enabled a research collaboration involving scientists from Boston College and SSRL to provide structural evidence supporting a 30-year old model accounting for the cooperative binding of ligands to allosteric proteins and enzymes - a function central to physiology and cellular processes. Over 30 years ago, two major models were developed to account for the cooperativity observed in oligomeric allosteric proteins such as hemoglobin, the oxygen carrier protein in blood: the concerted model, in which a protein has only two ”all-or-none” global states, vs. the sequential model that allows a number of different global conformational/energy states. Both, however, are based on just two local states of building blocks (subunits) in close analogy to magnetic spin states. In either model, a transition of one or more protein subunits leads to the global transition, in the case of hemoglobin, from the oxygen-releasing form to the oxygen-binding form, depending on the oxygen level in the blood stream. The concerted model, based on highly positive cooperativity, resembles the ferromagnetic phase transition, in which only two spin states account for the sharp phase transition between two global states. The sequential model, on the other hand, permits mixture of active and inactive subunits. Macol et al., constructed a version of an allosteric enzyme E. coli aspartate transcarbamoylase, which is composed of six equivalent catalytic monomers and six equivalent regulatory monomers in its native form, in such a way that only one of the six catalytic monomers could bind a substrate analog. Using solution x-ray scattering data recorded at BL4-2 to monitor the global structural state, they provided the first structural evidence that the transition of only one catalytic monomer is sufficient to transform the entire enzyme into the highly active state, lending strong support to the concerted model.

295

Approaches to Future Generation Photovoltaics and Solar Fuels: Multiple Exciton Generation in Quantum Dots, Quantum Dot Arrays, Molecular Singlet Fission, and Quantum Dot Solar Cells  

SciTech Connect (OSTI)

One potential, long-term approach to more efficient future generation solar cells is to utilize the unique properties of quantum dots (QDs) and unique molecular chromophores to control the relaxation pathways of excited states to produce enhanced conversion efficiency through efficient multiple electron-hole pair generation from single photons . We have observed efficient multiple exciton generation (MEG) in PbSe, PbS, PbTe, and Si QDs and efficient singlet fission (SF) in molecules that satisfy specific requirements for their excited state energy level structure to achieve carrier multiplication. We have studied MEG in close-packed QD arrays where the QDs are electronically coupled in the films and thus exhibit good transport while still maintaining quantization and MEG. We have developed simple, all-inorganic QD solar cells that produce large short-circuit photocurrents and power conversion efficiencies in the 3-5% range via both nanocrystalline Schottky junctions and nanocrystalline p-n junctions. These solar cells also show QYs for photocurrent that exceed 100% in the photon energy regions where MEG is possible; the photocurrent MEG QYs as a function of photon energy match those determined via time-resolved spectroscopy. We have also observed very efficient SF in thin films of molecular crystals of 1,3 diphenylisobenzofuran with quantum yields of 200% at the optimum SF threshold of 2Eg (HOMO-LUMO for S{sub 0}-S{sub 1}), reflecting the creation of two excited triplet states from the first excited singlet state. Various possible configurations for novel solar cells based on MEG in QDs and SF in molecules that could produce high conversion efficiencies will be presented, along with progress in developing such new types of solar cells. Recent analyses of the effect of MEG or SF combined with solar concentration on the conversion efficiency of solar cells will be discussed.

Nozik, A. J.; Beard, M. C.; Johnson, J. C.; Hanna, M. C.; Luther, J. M.; Midgett, A.; Semonin, O.; Michel, J.

2012-01-01T23:59:59.000Z

296

Redshifted and blueshifted photoluminescence emission of InAs/InP quantum dots upon amorphization of phase change material  

Science Journals Connector (OSTI)

We present the mechanisms underlying the redshifted and blueshifted photoluminescence (PL) of quantum dots (QDs) upon amorphization of phase change material (PCM). We calculated the...

Humam, Nurrul Syafawati Binti; Sato, Yu; Takahashi, Motoki; Kanazawa, Shohei; Tsumori, Nobuhiro; Regreny, Philippe; Gendry, Michel; Saiki, Toshiharu

2014-01-01T23:59:59.000Z

297

Narrow spectral linewidth of single zinc-blende GaN/AlN self-assembled quantum dots  

SciTech Connect (OSTI)

We study by microphotoluminescence the optical properties of single self-assembled zinc-blende GaN/AlN quantum dots grown by plasma-assisted molecular beam epitaxy. As opposed to previous reports, the high quality of such zinc-blende GaN quantum dots allows us to evidence a weak acoustic phonon sideband as well as a limited spectral diffusion. As a result, we report on resolution-limited quantum dot linewidths as narrow as 500 50 ?eV. We finally confirm the fast radiative lifetime and high-temperature operation of such quantum dots.

Sergent, S. [Institute for Nano Quantum Information Electronics, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505 (Japan)] [Institute for Nano Quantum Information Electronics, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505 (Japan); Kako, S. [Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505 (Japan)] [Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505 (Japan); Brger, M.; As, D. J. [Department Physik, Universitt Paderborn, Warburger Str. 100, 33098 Paderborn (Germany)] [Department Physik, Universitt Paderborn, Warburger Str. 100, 33098 Paderborn (Germany); Arakawa, Y. [Institute for Nano Quantum Information Electronics, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505 (Japan) [Institute for Nano Quantum Information Electronics, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505 (Japan); Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505 (Japan)

2013-10-07T23:59:59.000Z

298

Transition Strategies: Government Options and Market Penetration...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Strategies: Government Options and Market Penetration Scenarios Transition Strategies: Government Options and Market Penetration Scenarios Presentation on Transition Strategies:...

299

A quantum dot single-photon source with on-the-fly all-optical polarization control and timed emission  

E-Print Network [OSTI]

Sources of single photons are key elements in the study of basic quantum optical concepts and applications in quantum information science. Among the different sources available, semiconductor quantum dots excel with their straight forward integrability in semiconductor based on-chip solutions and the potential that photon emission can be triggered on demand. Usually, the photon emission event is part of a cascaded biexciton-exciton emission scheme. Important properties of the emitted photon such as polarization and time of emission are either probabilistic in nature or pre-determined by electronic properties of the system. In this work, we study the direct two-photon emission from the biexciton. We show that emission through this higher-order transition provides a much more versatile approach to generate a single photon. In the scheme we propose, the two-photon emission from the biexciton is enabled by a laser field (or laser pulse) driving the system into a virtual state inside the band gap. From this interm...

Heinze, Dirk; Schumacher, Stefan

2014-01-01T23:59:59.000Z

300

309 Building transition plan  

SciTech Connect (OSTI)

The preparation for decontamination and decommissioning (transition) of the 309 Building is projected to be completed by the end of the fiscal year (FY) 1998. The major stabilization and decontamination efforts include the Plutonium Recycle Test Reactor (PRTR), fuel storage and transfer pits, Transfer Waste (TW) tanks and the Ion Exchange Vaults. In addition to stabilizing contaminated areas, equipment, components, records, waste products, etc., will be dispositioned. All nonessential systems, i.e., heating, ventilation, and air conditioning (HVAC), electrical, monitoring, fluids, etc., will be shut down and drained/de-energized. This will allow securing of the process, laboratory, and office areas of the facility. After that, the facility will be operated at a level commensurate with its surveillance needs while awaiting D&D. The implementation costs for FY 1995 through FY 1998 for the transition activities are estimated to be $1,070K, $2,115K, $2,939K, and $4,762K, respectively. Costs include an assumed company overhead of 20% and a 30% out year contingency.

Graves, C.E.

1994-08-31T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

Connecticut Transit (CTTRANSIT) Fuel Cell Transit Bus: Third...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Connecticut Transit (CTTRANSIT) in Hartford for one prototype fuel cell bus and three new diesel buses operating from the same location. The prototype fuel cell bus was...

302

Alameda-Contra Costa Transit District Fuel Cell Transit Buses...  

Office of Environmental Management (EM)

Results Update This report is an update to the 2007 preliminary results report on hydrogen fuel cell and diesel buses operating at Alameda-Contra Costa Transit District....

303

Effect of shells on photoluminescence of aqueous CdTe quantum dots  

SciTech Connect (OSTI)

Graphical abstract: Size-tunable CdTe coated with several shells using an aqueous solution synthesis. CdTe/CdS/ZnS quantum dots exhibited high PL efficiency up to 80% which implies the promising applications for biomedical labeling. - Highlights: CdTe quantum dots were fabricated using an aqueous synthesis. CdS, ZnS, and CdS/ZnS shells were subsequently deposited on CdTe cores. Outer ZnS shells provide an efficient confinement of electron and hole inside the QDs. Inside CdS shells can reduce the strain on the QDs. Aqueous CdTe/CdS/ZnS QDs exhibited high stability and photoluminescence efficiency of 80%. - Abstract: CdTe cores with various sizes were fabricated in aqueous solutions. Inorganic shells including CdS, ZnS, and CdS/ZnS were subsequently deposited on the cores through a similar aqueous procedure to investigate the effect of shells on the photoluminescence properties of the cores. In the case of CdTe/CdS/ZnS quantum dots, the outer ZnS shell provides an efficient confinement of electron and hole wavefunctions inside the quantum dots, while the middle CdS shell sandwiched between the CdTe core and ZnS shell can be introduced to obviously reduce the strain on the quantum dots because the lattice parameters of CdS is situated at the intermediate-level between those of CdTe and ZnS. In comparison with CdTe/ZnS coreshell quantum dots, the as-prepared water-soluble CdTe/CdS/ZnS quantum dots in our case can exhibit high photochemical stability and photoluminescence efficiency up to 80% in an aqueous solution, which implies the promising applications in the field of biomedical labeling.

Yuan, Zhimin; Yang, Ping, E-mail: mse_yangp@ujn.edu.cn

2013-07-15T23:59:59.000Z

304

Study of valence-band intersublevel transitions in InAs/GaAs quantum dots-in-well infrared photodetectors  

E-Print Network [OSTI]

://scitation.aip.org/content/aip/journal/apl/104/17?ver=pdfcov Published by the AIP Publishing Articles you may be interested in An intermediate-band

Matsik, Steven G.

305

Alternative Fuels at AC Transit  

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

Alternative Fuels at AC Transit Alternative Fuels at AC Transit Speaker(s): Jaimie Levin Date: November 1, 2011 - 12:00pm Location: 90-3122 Seminar Host/Point of Contact: Eve Edelson Mr. Levin will discuss AC Transit's range of environmental technology initiatives, including: zero emission fuel cell transit buses; state-of-the-art, high-capacity, hydrogen fueling stations; solar energy systems; and stationary solid oxide fuel cell power generators. AC Transit has the largest fleet of fuel cell buses in the United States, featuring fuel cell systems with more than 10,000 hours of continuous operation without any failures or power degradation. Their fuel cell fleet has logged more than 400,000 miles of service and carried in excess of one million passengers. Come hear what AC Transit has learned, where they're headed,

306

Optical anisotropy in individual CdS quantum dot ensembles  

Science Journals Connector (OSTI)

The polarized microphotoluminescence (PL) spectroscopy of individual spherical and rod-shaped CdS quantum dot (QD) ensembles has been investigated. In a spherical QD ensemble, optical anisotropy was observed despite the spherical shapes of both the ensemble and individual QD components. The directions of the maximum linearly polarized PL were different for different spherical QD ensembles, and independent on the polarization direction of the excitation. However, for a fixed polarization direction of PL, the PL yield significantly varied with the polarization direction of the excitation. In a rod-shaped QD ensemble, the direction of maximum polarized PL was observed to be perpendicular to the length direction of the rod, regardless of the polarization direction of the excitation. The observed PL anisotropies in individual spherical and rod-shaped QD ensembles are explained in terms of the crystallographic orientation of the individual QD components that make up the ensemble and obey the linear polarization selection rules. A statistic model is proposed to qualitatively describe the degree of polarization based on a three-dimensional crystallographic orientation of QDs with respect to the directions of excitation and observation.

Jifa Qi, Chuanbin Mao, John M. White, and Angela M. Belcher

2003-09-24T23:59:59.000Z

307

Theory of coherent dynamic nuclear polarization in quantum dots  

Science Journals Connector (OSTI)

We consider the production of dynamic nuclear spin polarization (DNP) in a two-electron double quantum dot, in which the electronic levels are repeatedly swept through a singlet-triplet avoided crossing. Our analysis helps to elucidate the intriguing interplay between electron-nuclear hyperfine coupling, electronic spin-orbit coupling, and electron and nuclear Larmor precession in an externally applied magnetic field in guiding the production of DNP. In particular, we specifically address the roles of multiple nuclear spin species. By treating the nuclear spin dynamics semiclassically, we identify two contributions to the DNP production rate, a geometric contribution and a dynamic contribution, which depend in very different ways on control parameters such as the sweep rate and holding time near the level crossing. We find that the dynamical contribution dominates the DNP when the system is held near the singlet-triplet avoided crossing for a time on the order of the nuclear Larmor period. Detailed numerical calculations provide a physical picture for understanding the oscillations observed by Foletti et al. in arXiv:0801.3613.

Izhar Neder; Mark S. Rudner; Bertrand I. Halperin

2014-02-04T23:59:59.000Z

308

PROPERTIES OF UMBRAL DOTS FROM STRAY LIGHT CORRECTED HINODE FILTERGRAMS  

SciTech Connect (OSTI)

High-resolution blue continuum filtergrams from Hinode are employed to study the umbral fine structure of a regular unipolar sunspot. The removal of scattered light from the images increases the rms contrast by a factor of 1.45 on average. Improvement in image contrast renders identification of short filamentary structures resembling penumbrae that are well separated from the umbra-penumbra boundary and comprise bright filaments/grains flanking dark filaments. Such fine structures were recently detected from ground-based telescopes and have now been observed with Hinode. A multi-level tracking algorithm was used to identify umbral dots (UDs) in both the uncorrected and corrected images and to track them in time. The distribution of the values describing the photometric and geometric properties of UDs is more easily affected by the presence of stray light while it is less severe in the case of kinematic properties. Statistically, UDs exhibit a peak intensity, effective diameter, lifetime, horizontal speed, and a trajectory length of 0.29I{sub QS}, 272 km, 8.4 minutes, 0.45 km s{sup -1}, and 221 km, respectively. The 2 hr 20 minute time sequence depicts several locations where UDs tend to appear and disappear repeatedly with various time intervals. The correction for scattered light in the Hinode filtergrams facilitates photometry of umbral fine structure, which can be related to results obtained from larger telescopes and numerical simulations.

Louis, Rohan E.; Mathew, Shibu K.; Bayanna, A. Raja [Udaipur Solar Observatory, Physical Research Laboratory, Dewali, Badi Road, Udaipur, Rajasthan 313004 (India); Rubio, Luis R. Bellot [Instituto de Astrofisica de Andalucia (CSIC), Apartado de Correos 3004, 18080 Granada (Spain); Ichimoto, Kiyoshi [Kwasan and Hida Observatories, Kyoto University, Yamashina-ku, Kyoto 607-8417 (Japan); Ravindra, B., E-mail: eugene@prl.res.in [Indian Institute of Astrophysics, II Block, Koramangla, Bangalore 560034 (India)

2012-06-20T23:59:59.000Z

309

Transition Plan | Department of Energy  

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

and training needs for system operation and maintenance, planning for data migration, etc Transition Plan More Documents & Publications System Design Feasibility Study Report...

310

Even more Oak Ridge transitions  

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

Even more Oak Ridge transitions The University of Chicago managed the Clinton Laboratories until July 1, 1945 when Monsanto Chemical Company took over operations. Charles A....

311

DOE Hydrogen Transition Analysis Workshop  

Broader source: Energy.gov [DOE]

The U.S. Department of Energy sponsored a Hydrogen Transition Analysis Workshop in Washington, DC, on January 26, 2006. Attendees included automobile and energy company representatives, industrial...

312

IDEA Reauthorized Statute SECONDARY TRANSITION  

E-Print Network [OSTI]

to Kindergarten Age; Procedural Safeguards: Surrogates, Notice and Consent; Procedural Safeguards: Mediation and Resolution Sessions; Procedural Safeguards: Due Process Hearings; Secondary Transition; State Funding

313

Inhibition of plasmonically enhanced interdot energy transfer in quantum dot solids via photo-oxidation  

SciTech Connect (OSTI)

We studied the impact of photophysical and photochemical processes on the interdot Forster energy transfer in monodisperse CdSe/ZnS quantum dot solids. For this, we investigated emission spectra of CdSe/ZnS quantum dot solids in the vicinity of gold metallic nanoparticles coated with chromium oxide. The metallic nanoparticles were used to enhance the rate of the energy transfer between the quantum dots, while the chromium oxide coating led to significant increase of their photo-oxidation rates. Our results showed that irradiation of such solids with a laser beam can lead to unique spectral changes, including narrowing and blue shift. We investigate these effects in terms of inhibition of the plasmonically enhanced interdot energy transfer between quantum dots via the chromium-oxide accelerated photo-oxidation process. We demonstrate this considering energy-dependent rate of the interdot energy transfer process, plasmonic effects, and the way photo-oxidation enhances non-radiative decay rates of quantum dots with different sizes.

Sadeghi, S. M. [Department of Physics, University of Alabama in Huntsville, Huntsville, Alabama 35899 (United States); Nano and Micro Device Center, University of Alabama in Huntsville, Huntsville, Alabama 35899 (United States); Nejat, A.; West, R. G. [Department of Physics, University of Alabama in Huntsville, Huntsville, Alabama 35899 (United States)

2012-11-15T23:59:59.000Z

314

Red light emitting solid state hybrid quantum dotnear-UV GaN LED devices  

Science Journals Connector (OSTI)

We produced coreshell (CdSe)ZnSe quantum dots by direct colloidal chemical synthesis and the surface-passivation methodan overcoating of the core CdSe with a larger-bandgap material ZnSe. The (CdSe)ZnSe quantum dots(QDs) play the role of a colour conversion centre. We call these quantum dots nanophosphors. We fabricated red light emitting hybrid devices of (CdSe)ZnSe QDs and a near-UV GaN LED by combining red light emitting (CdSe)ZnSe quantum dots (as a colour conversion centre) with a near-UV(NUV) GaN LED chip (as an excitation source). A few good red phosphors have been known for UV excitation wavelengths, and red phosphors for UV excitation have been sought for a long time. Here we tested the possibility of using (CdSe)ZnSe QDs as red nanophosphors for UV excitation. The fabricated red light emitting hybrid device of (CdSe)ZnSe and a NUV GaN LED chip showed a good luminance. We demonstrated that the (CdSe)ZnSe quantum dots were promising red nanophosphors for NUV excitation and that a red LED made of QDs and a NUV excitation source was a highly efficient hybrid device.

Hongjoo Song; Seonghoon Lee

2007-01-01T23:59:59.000Z

315

High-tech IPOs in the USA, UK and Europe after the dot-com bubble  

Science Journals Connector (OSTI)

From 1998 to 2001, the high-tech industry saw a dramatic increase and subsequent sharp decline in market capitalisation during a phenomenon known as the dot-com bubble. During this time there were a large number of private companies that made the decision to go public via an Initial Public Offering (IPO) of stock on the general equities market. After the dot-com crash of 2001, the IPO market for high-tech companies changed dramatically. Far fewer companies went public, and they had much lower first-day returns than those during the bubble. This paper explores the first-day returns of high-tech IPOs in the USA and Europe in the post-bubble era. We compare the results of the 2002??2005 post-bubble period with those of the 1998??2001 dot-com bubble period. We find that the high-tech IPO market was dramatically affected by the dot-com crash and that, after the crash, the number of high-tech IPOs dropped considerably, as did the average first-day returns of these IPOs. Finally, we find that the European high-tech IPO market was not as adversely affected by the dot-com crash as the American market.

Keith Pilbeam; Frank Nagle

2009-01-01T23:59:59.000Z

316

Connecticut Transit (CTTRANSIT) Fuel Cell Transit Bus: Preliminary Evaluation Results  

Broader source: Energy.gov [DOE]

This report provides preliminary results from the evaluation of a protoptye fuel cell transit bus operating at Connecticut Transit in Hartford. Included are descriptions of the planned fuel cell bus demonstration and equipment, early results and agency experience are also provided.

317

Alameda-Contra Costa Transit District (AC Transit) Fuel Cell Transit Buses: Third Evaluation Report  

Broader source: Energy.gov [DOE]

This report describes operations at Alameda-Contra Costa Transit district for three protoype fuel cell buses and six diesel buses operating from the same location.

318

Alameda-Contra Costa Transit District (AC Transit) Fuel Cell Transit Buses: Third Evaluation Report- Appendices  

Broader source: Energy.gov [DOE]

This report describes operations at Alameda-Contra Costa Transit district for three protoype fuel cell buses and six diesel buses operating from the same location.

319

Near-infrared peptide-coated quantum dots for small animal imaging Gopal Iyer, Jack J. Li, Fabien Pinaud, James M. Tsay, Laurent A. Bentolila, Xavier  

E-Print Network [OSTI]

Near-infrared peptide-coated quantum dots for small animal imaging Gopal Iyer, Jack J. Li, Fabien ABSTRACT We have synthesized high quality type-II CdTe/CdSe near infrared quantum dots using successive ion used a peptide coating technique on type-II and commercial near infrared quantum dots for delivery

Michalet, Xavier

320

Analysis of the reduced thermal conductivity in InGaAs/GaAs quantum dot lasers from chirp characteristics  

E-Print Network [OSTI]

injection which we term "thermal impact" , the ther- mal conductivity of the active region is estimatedAnalysis of the reduced thermal conductivity in InGaAs/GaAs quantum dot lasers from chirp; published online 21 September 2006 The thermal conductivity of self-organized quantum dot QD active regions

Klotzkin, David

Note: This page contains sample records for the topic "gray dots transitioning" 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

Managing Transition Cows Amanda Pellegrin  

E-Print Network [OSTI]

Managing Transition Cows Amanda Pellegrin Animal Nutrition winter 20009 Tisch, David. Animal Feeds://www.uky.edu/Ag/ Animal Sciences/dairy/ extension/nut00046.pdf. Works Cited Managng Transition Priod in Dairy Cattle Pasture management Pastures and hays comprised of leg- umes and legume-grass mixtures are good sources

Selmic, Sandra

322

Benchmarking a software transition process  

Science Journals Connector (OSTI)

Software transition is a strongly under-researched process as compared to other software lifecycle processes. Today, basic issues such as how and by whom software transition is performed are not clear enough. In this paper, we explore these issues by ... Keywords: deployment, handover, marketing, quality assurance, testing

Houssam Toufaili; Mira Kajko-Mattsson

2010-06-01T23:59:59.000Z

323

SunLine Transit Agency  

Broader source: Energy.gov [DOE]

SunLine Transit Agency provides public transit and community services to California's Coachella Valley. The service area is more than 1,100 square miles and includes nine member cities, as well as Riverside County. Over the years, SunLine has pursued an aggressive strategy for implementing clean technologies into its fleet.

324

Energy Transition Initiative: Islands Playbook  

Office of Energy Efficiency and Renewable Energy (EERE)

The Island Energy Playbook provides an action-oriented guide to successfully initiating, planning, and completing a transition to an energy system that primarily relies on local resources to eliminate a dependence on one or two imported fuels. It is intended to serve as a readily available framework that any community can adapt to organize its own energy transition effort.

325

Creating a Precise Atomic-Scale Map of Quantum Dots | Advanced Photon  

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

Getting to the Roots of Lethal Hairs Getting to the Roots of Lethal Hairs Stressing Out the Twins in Magnesium Size-Related Behavior of Anatase Nanocrystals under Extreme Pressure Boron-Based Compounds Trick a Biomedical Protein A Targeted Cancer Treatment using Nanomaterials Science Highlights Archives: 2013 | 2012 | 2011 | 2010 2009 | 2008 | 2007 | 2006 2005 | 2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed Creating a Precise Atomic-Scale Map of Quantum Dots OCTOBER 9, 2009 Bookmark and Share An atomic-scale map of the interface between an atomic dot and its substrate. Each peak represents a single atom. The map, made with high-intensity x-rays at the APS, is a slice through a vertical cross-section of the dot. (Image courtesy of Roy Clarke, University of

326

Quantum Dots Promise to Significantly Boost Photovoltaic Efficiencies, The Spectrum of Clean Energy Innovation (Fact Sheet)  

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

Semiconductor quantum dots used in so-called "third-generation" solar cells have the potential Semiconductor quantum dots used in so-called "third-generation" solar cells have the potential to dramatically increase-in some cases even double-the efficiency of converting sunlight to electricity. The conversion process works via "multiple exciton generation (MEG)." In this process, when a single photon of light of sufficient energy is absorbed by the quantum dot, it produces more than one bound electron-hole pair, or exciton. NREL scientists were the first to predict this important unusual MEG effect in QDs, which contrasts with conventional photo- voltaic (PV) cells having much larger crystals and many more atoms and in which one photon produces only one electron-hole pair. The electronic process is also very fast, occurring within

327

Stable and unstable dynamics of Overhauser fields in a double quantum dot  

Science Journals Connector (OSTI)

Nonlinear dynamics of nuclear spin ensembles driven by a two-electron system in a double quantum dot in the Pauli spin blockade (SB) regime is studied experimentally in conjunction with numerical simulation. Dynamic nuclear spin polarization (DNP) is systematically studied by evaluating the current level and its fluctuations. We interpret large current noise in the SB regime as stable feedback noise, where identical Overhauser fields of the two dots are preferred. In contrast, stepwise increases of current in the shallow Coulomb blockade region can be understood as unstable dynamics with significant imbalance of the Overhauser fields, which cancels the external magnetic field in one of the two dots. There, an extremely small transverse Overhauser field can easily lift the SB transport, giving the highest current level, when longitudinal components cancel the applied field.

Sonia Sharmin; Koji Muraki; Toshimasa Fujisawa

2014-03-21T23:59:59.000Z

328

Transmission phase of a quantum dot and statistical fluctuations of partial-width amplitudes  

E-Print Network [OSTI]

Experimentally, the phase of the amplitude for electron transmission through a quantum dot (transmission phase) shows the same pattern between consecutive resonances. Such universal behavior, found for long sequences of resonances, is caused by correlations of the signs of the partial-width amplitudes of the resonances. We investigate the stability of these correlations in terms of a statistical model. For a classically chaotic dot, the resonance eigenfunctions are assumed to be Gaussian distributed. Under this hypothesis, statistical fluctuations are found to reduce the tendency towards universal phase evolution. Long sequences of resonances with universal behavior only persist in the semiclassical limit of very large electron numbers in the dot and for specific energy intervals. Numerical calculations qualitatively agree with the statistical model but quantitatively are closer to universality.

Rodolfo A. Jalabert; Guillaume Weick; Hans A. Weidenmller; Dietmar Weinmann

2013-12-03T23:59:59.000Z

329

Mn solid solutions in self-assembled Ge/Si (001) quantum dot heterostructures  

SciTech Connect (OSTI)

Heteroepitaxial Ge{sub 0.98}Mn{sub 0.02} quantum dots (QDs) on Si (001) were grown by molecular beam epitaxy. The standard Ge wetting layer-hut-dome-superdome sequence was observed, with no indicators of second phase formation in the surface morphology. We show that Mn forms a dilute solid solution in the Ge quantum dot layer, and a significant fraction of the Mn partitions into a sparse array of buried, Mn-enriched silicide precipitates directly underneath a fraction of the Ge superdomes. The magnetic response from the ultra-thin film indicates the absence of robust room temperature ferromagnetism, perhaps due to anomalous intermixing of Si into the Ge quantum dots.

Kassim, J.; Nolph, C.; Reinke, P.; Floro, J. [Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904 (United States); Jamet, M. [Institut Nanosciences et Cryogenie/SP2M, CEA-UJF, F-38054 Grenoble (France)

2012-12-10T23:59:59.000Z

330

Quantum dot coating of baculoviral vectors enables visualization of transduced cells and tissues  

SciTech Connect (OSTI)

Highlights: The use of quantum dot (QD)-labeled viral vectors for in vivo imaging is not well investigated. A new method to label enveloped baculovirus with glutathione-capped CdTe QDs is developed. The labeling enables the identification of transduced, cultured cells based on fluorescence. The labeling also allows evaluation of viral transduction in a real-time manner in living mice. The method has the potential to assess viral vector-based gene therapy protocols in future. -- Abstract: Imaging of transduced cells and tissues is valuable in developing gene transfer vectors and evaluating gene therapy efficacy. We report here a simple method to use bright and photostable quantum dots to label baculovirus, an emerging gene therapy vector. The labeling was achieved through the non-covalent interaction of glutathione-capped CdTe quantum dots with the virus envelope, without the use of chemical conjugation. The quantum dot labeling was nondestructive to viral transduction function and enabled the identification of baculoviral vector-transduced, living cells based on red fluorescence. When the labeled baculoviral vectors were injected intravenously or intraventricularly for in vivo delivery of a transgene into mice, quantum dot fluorescence signals allow us monitor whether or not the injected tissues were transduced. More importantly, using a dual-color whole-body imaging technology, we demonstrated that in vivo viral transduction could be evaluated in a real-time manner in living mice. Thus, our method of labeling a read-to-use gene delivery vector with quantum dots could be useful towards the improvement of vector design and will have the potential to assess baculovirus-based gene therapy protocols in future.

Zhao, Ying; Lo, Seong Loong [Institute of Bioengineering and Nanotechnology, Singapore (Singapore)] [Institute of Bioengineering and Nanotechnology, Singapore (Singapore); Zheng, Yuangang [Institute of Materials Research and Engineering, Singapore (Singapore)] [Institute of Materials Research and Engineering, Singapore (Singapore); Lam, Dang Hoang [Institute of Bioengineering and Nanotechnology, Singapore (Singapore) [Institute of Bioengineering and Nanotechnology, Singapore (Singapore); Department of Biological Sciences, National University of Singapore, Singapore (Singapore); Wu, Chunxiao [Institute of Bioengineering and Nanotechnology, Singapore (Singapore)] [Institute of Bioengineering and Nanotechnology, Singapore (Singapore); Han, Ming Yong [Institute of Materials Research and Engineering, Singapore (Singapore)] [Institute of Materials Research and Engineering, Singapore (Singapore); Wang, Shu, E-mail: dbsws@nus.edu.sg [Institute of Bioengineering and Nanotechnology, Singapore (Singapore) [Institute of Bioengineering and Nanotechnology, Singapore (Singapore); Department of Biological Sciences, National University of Singapore, Singapore (Singapore)

2013-04-26T23:59:59.000Z

331

AUTHORIZING THE DOT SPECIFICATION 6M PACKAGING FOR CONTINUED USE AT THE SAVANNAH RIVER SITE  

SciTech Connect (OSTI)

The U.S. Department of Transportation (DOT) Specification 6M packaging was in extensive use for more than 40 years for in-commerce shipments of Type B quantities of fissile and radioactive material (RAM) across the USA, among the Department of Energy (DOE) laboratories, and between facilities in the DOE production complex. In January 2004, the DOT Research and Special Programs Administration (RSPA) Agency issued a final rule in the Federal Register to ammend requirements in the Hazardous Materials Regulations (HMR) pertaining to the transportation of radioactive materials. The final rule became effective on October 1, 2004. One of those changes discontinued the use of the DOT specification 6M, along with other DOT specification packagings, on October 1, 2008. A main driver for the change was due to the fact that 6M specification packagings were not supported by a Safety Analysis Report for Packagings (SARP) that was compliant with Title 10 of the Code of Federal Regulations (CFR) Part 71 (10 CFR 71). The regulatory rules for the discontinued use have been edited in Title 49 of the CFR Parts 100-185, 2004 edition and thereafter. Prior to October 1, 2008, the use of the 6M within the boundaries of the Savannah River Site (SRS), called an onsite transfer, was governed by an onsite transportation document that referenced 49 CFR Parts 100-185. SRS had to develop an Onsite Safety Assessment (OSA) which was independent of 49 CFR in order to justify the continued use of the DOT Specification 6M for the transfer of radioactive material (RAM) at the SRS after October 1, 2008. This paper will discuss the methodology for and difficulties associated with authorizing the DOT Specification 6M Packaging for continued use at the Savannah River Site.

Watkins, R.; Loftin, B.; Hoang, D.

2010-03-04T23:59:59.000Z

332

Patterning quantum dot arrays using DNA replication principles.  

SciTech Connect (OSTI)

The convergence of nanoscience and biotechnology has opened the door to the integration of a wide range of biological molecules and processes with synthetic materials and devices. A primary biomolecule of interest has been DNA based upon its role as information storage in living systems, as well as its ability to withstand a wide range of environmental conditions. DNA also offers unique chemistries and interacts with a range of biomolecules, making it an ideal component in biological sensor applications. The primary goal of this project was to develop methods that utilize in vitro DNA synthesis to provide spatial localization of nanocrystal quantum dots (nQDs). To accomplish this goal, three specific technical objectives were addressed: (1) attachment of nQDs to DNA nucleotides, (2) demonstrating the synthesis of nQD-DNA strands in bulk solution, and (3) optimizing the ratio of unlabeled to nQD-labeled nucleotides. DNA nucleotides were successfully attached to nQDs using the biotin-streptavidin linkage. Synthesis of 450-nm long, nQD-coated DNA strands was demonstrated using a DNA template and the polymerase chain reaction (PCR)-based method of DNA amplification. Modifications in the synthesis process and conditions were subsequently used to synthesize 2-{micro}m long linear nQD-DNA assemblies. In the case of the 2-{micro}m structures, both the ratio of streptavidin-coated nQDs to biotinylated dCTP, and streptavidin-coated nQD-dCTPs to unlabeled dCTPs affected the ability to synthesize the nQD-DNA assemblies. Overall, these proof-of-principles experiments demonstrated the successful synthesis of nQD-DNA using DNA templates and in vitro replication technologies. Continued development of this technology may enable rapid, spatial patterning of semiconductor nanoparticles with Angstrom-level resolution, as well as optically active probes for DNA and other biomolecular analyses.

Crown, Kevin K.; Bachand, George David

2004-11-01T23:59:59.000Z

333

LED Dot matrix text recognition method in natural scene  

Science Journals Connector (OSTI)

Abstract In recent years, light-emitting diodes dot-matrix text (LED text) is being widely used for displaying information and announcements. However, there is currently no text detection system that is capable of handling LED text. Unlike general printed text, it is not easy to detect and recognize LED text due to its discontinuity. A character of the LED is generally displayed with a matrix of segments and composed with them to generate the text. Furthermore, it is necessary to detect each character from a line of LED text for creating a robust text detection system. Thus, this paper proposes a method for LED text detection and recognition in natural scene images. To perform this goal of detection and recognition of a character and text, it consists of two main steps with the following steps: the first step, a Canny edge was used to detect character pixels which appear in LED display area from scene images. The center points of edge segments are calculated. These points are merged based on their properties to generate a character candidate. In order to obtain character feature, the spatial information such as a centroid and orientation of the character candidate are used. These values are then analyzed using a k-nearest neighbor approach for classifying the character candidate as a certain alphanumeric. In the second step, the recognized characters are later combined into a text line based on the similarity of their characteristics such as width, height, aspect ratio and color. The post-processing of text line generating is then applied for rectifying the falsely recognized characters. In experiments, our proposed method achieves 68.8% and 47% for detection and recognition rate, respectively. These results show the robustness and effectiveness of the proposed method for detecting and recognizing the LED text in natural scene images that has filled the vacancy that the printed and dense text detection system has not covered.

Wahyono; Kanghyun Jo

2015-01-01T23:59:59.000Z

334

Magnetism in Transition Metals  

Science Journals Connector (OSTI)

An attempt is made to distinguish "band-type magnetization" from "alignment-type magnetization" on the basis of whether the local moments associated with the Wannier functions on the atom sites are "induced" or "permanent." In general, the local moment is partially induced and partially permanent, and a criterion is suggested: A local moment is defined to be of the permanent variety if in the presence of magnetic forces (supposed characteristic of the crystal in a given circumstance) tending to produce a moment in one sense (z^, say) of a direction, it can maintain itself (perhaps altered in magnitude, however) in the opposite sense (-z^), as well as in z^. The internal mechanisms tending to produce permanent moments are simplified to just the Hcorr of Anderson, and the external inducing mechanism are the Heisenberg interaction and a magnetic field, Hspin, say. If Hcorr dominates Hspin, then it is shown that a local moment can maintain itself to the polarizing tendencies (whence an alignment type of magnetization calculation is appropriate), but if Hspin dominates Hcorr, then the local moment has only one sense possible in this environment (and a band type of calculation is appropriate). It is suggested that this distinction is relevant to transition metals.

M. Bailyn

1965-09-13T23:59:59.000Z

335

Quantum interference and control of the optical response in quantum dot molecules  

SciTech Connect (OSTI)

We discuss the optical response of a quantum molecule under the action of two lasers fields. Using a realistic model and parameters, we map the physical conditions to find three different phenomena reported in the literature: the tunneling induced transparency, the formation of Autler-Townes doublets, and the creation of a Mollow-like triplet. We found that the electron tunneling between quantum dots is responsible for the different optical regime. Our results not only explain the experimental results in the literature but also give insights for future experiments and applications in optics using quantum dots molecules.

Borges, H. S.; Sanz, L.; Villas-Boas, J. M.; Alcalde, A. M. [Instituto de Fsica, Universidade Federal de Uberlndia, 38400-902 Uberlndia-MG (Brazil)] [Instituto de Fsica, Universidade Federal de Uberlndia, 38400-902 Uberlndia-MG (Brazil)

2013-11-25T23:59:59.000Z

336

Theory of Coulomb-blockade oscillations in the conductance of a quantum dot  

Science Journals Connector (OSTI)

A linear-response theory is developed for resonant tunneling through a quantum dot of small capacitance, in the regime of thermally broadened resonances. The theory extends the classical theory of Coulomb-blockade oscillations by Kulik and Shekhter to the resonant-tunneling regime. Both the cases of negligible and strong inelastic scattering in the quantum dot are considered. Effects from the non-Fermi-Dirac distribution of electrons among the energy levels (occurring when kT is comparable to the level separation) are fully included. Explicit analytic results are obtained for the periodicity, amplitude, line shape, and activation energy of the conductance oscillations.

C. W. J. Beenakker

1991-07-15T23:59:59.000Z

337

Test and evaluation document for DOT Specification 7A Type A Packaging. Revision 3  

SciTech Connect (OSTI)

The US Department of Energy (DOE) has been conducting, through several of its operating contractors, an evaluation and testing program to qualify Type A radioactive material packagings per US Department of Transportation (DOT) Specification 7A (DOT-7A) of the Code of Federal Regulations (CFR), Title 49, Part 178 (49 CFR 178). The program is currently administered by the DOE, Office of Facility Safety Analysis, DOE/EH-32, at DOE-Headquarters (DOE-HQ) in Germantown, Maryland. This document summarizes the evaluation and testing performed for all of the packagings successfully qualified in this program.

NONE

1996-01-30T23:59:59.000Z

338

Selective coherent destruction of tunneling in a quantum-dot array  

Science Journals Connector (OSTI)

The coherent manipulation of quantum states is one of the main tasks required in quantum computation. In this paper we demonstrate that it is possible to control coherently the electronic position of a particle in a quantum-dot array. By tuning an external ac electric field we can selectively suppress the tunneling between dots, trapping the particle in a determined region of the array. The problem is treated nonperturbatively by a time-dependent Hamiltonian in the effective mass approximation and using Floquet theory. We find that the quasienergy spectrum exhibits crossings and anticrossings at certain field intensities that result in the selective suppression of tunneling.

J. M. Villas-Bas, Sergio E. Ulloa, and Nelson Studart

2004-07-08T23:59:59.000Z

339

Polka dot solar cell. Final report, 1 April 1980-29 May 1981  

SciTech Connect (OSTI)

Polka dot solar cells are named for their conducting grid pattern. A model was developed for thick epitaxial layer front junctions with moderate doping levels. The dependence of surface recombination velocity on doping is briefly discussed and epitaxial emitter cell fabrication by solution growth of Si from Sn is described. Two electron beam methods were used to determine the minority carrier diffusion lengths in the epitaxial layers. Arsenic diffusion from Sn-As sources is examined. Some possible modifications to the polka dot cell process are described. (LEW)

Not Available

1981-01-01T23:59:59.000Z

340

The convergence of quantum-dot-mediated fluorescence resonance energy transfer and  

Science Journals Connector (OSTI)

We present a novel convergence of quantum-dot-mediated fluorescence resonance energy transfer (QD-FRET) and microfluidics, through which molecular interactions were precisely controlled and monitored using highly sensitive quantum-dot-mediated FRET. We demonstrate its potential in studying the kinetics of self-assembly of DNA polyplexes under laminar flow in real time with millisecond resolution. The integration of nanophotonics and microfluidics offers a powerful tool for elucidating the formation of polyelectrolyte polyplexes, which is expected to provide better control and synthesis of uniform and customizable polyplexes for future nucleic acid-based therapeutics.

Yi-Ping Ho; Hunter H Chen; Kam W Leong; Tza-Huei Wang

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

Observation of the Kondo effect in a spin-3/2 hole quantum dot  

SciTech Connect (OSTI)

We report the observation of the Kondo effect in a spin-3/2 hole quantum dot formed near pinch-off in a GaAs quantum wire. We clearly observe two distinctive hallmarks of quantum dot Kondo physics. First, the zero-bias peak in the differential conductance splits an in-plane magnetic field and the splitting is independent of gate voltage. Second, the splitting rate is twice as large as that for the lowest one-dimensional subband. We show that the Zeeman splitting of the zero-bias peak is highly anisotropic and attribute this to the strong spin-orbit interaction for holes in GaAs.

Klochan, O.; Micolich, A. P.; Hamilton, A. R. [School of Physics, University of New South Wales, Sydney NSW 2052 (Australia); Trunov, K.; Reuter, D.; Wieck, A. D. [Angewandte Festkrperphysik, Ruhr-Universitt Bochum, D-44780 Bochum (Germany)

2013-12-04T23:59:59.000Z

342

Fast Electrical Control of a Quantum Dot Strongly Coupled to a Nano-resonator  

E-Print Network [OSTI]

The resonance frequency of an InAs quantum dot strongly coupled to a GaAs photonic crystal cavity was electrically controlled via quantum confined Stark effect. Stark shifts up to 0.3meV were achieved using a lateral Schottky electrode that created a local depletion region at the location of the quantum dot. We report switching of a probe laser coherently coupled to the cavity up to speeds as high as 150MHz, limited by the RC constant of the transmission line. The coupling rate and the magnitude of the Stark shift with electric field were investigated while coherently probing the system.

Andrei Faraon; Arka Majumdar; Hyochul Kim; Pierre Petroff; Jelena Vuckovic

2009-06-03T23:59:59.000Z

343

Spin Dynamics in Two-Dimensional Arrays of Quantum Dots with Local Ordering of Nanoclusters  

SciTech Connect (OSTI)

Electron paramagnetic resonance (EPR) is used to probe the spin dynamics in two-dimensional (2D) quantum dot (QD) arrays with local ordering of nanoclusters. A careful examination of EPR line shape, width and g-factor values allow us to attribute this signal to the electrons localized in the strain-induced potential wells in Si in the vicinity of the Ge dots. The strong orientation dependence of EPR line width is defined by changing localization degree of electrons at different magnetic field directions. The theoretical approximation of orientation dependence of EPR line width allows estimating the effective radius of electron localization, as {approx}80 nm.

Zinovieva, A. F.; Dvurechenskii, A. V.; Stepina, N. P.; Nikiforov, A. I.; Lyubin, A. S. [Institute of Semiconductor Physics, 630090 Novosibirsk, pr. Lavrentieva 13 (Russian Federation); Sobolev, N.; Carmo, M. C. [Departamento de Fisica e I3N, Universidade de Aveiro, Aveiro (Portugal)

2011-12-23T23:59:59.000Z

344

Fiber glass reinforcement wrap gets DOT nod for gas-line use  

SciTech Connect (OSTI)

Panhandle Eastern Corp.'s Texas Eastern Transmission Corp. has become the first US natural-gas pipeline company to install, under federal waiver, a fiber glass reinforcement on an in-service gas pipeline. The Clock Spring repair system was installed in August on six segments of Texas Eastern's 20-in. gas pipeline in Fayette County, Ohio, after the company had received a US Department of Transportation (DOT) waiver to use the system in place of conventional DOT-mandated repair methods. The paper describes the conventional methods, as well as comparing costs of both methods.

Not Available

1993-12-13T23:59:59.000Z

345

Negative differential gain in quantum dot systems: Interplay of structural properties and many-body effects  

SciTech Connect (OSTI)

The saturation behaviour of optical gain with increasing excitation density is an important factor for laser device performance. For active materials based on self-organized InGaAs/GaAs quantum dots, we study the interplay between structural properties of the quantum dots and many-body effects of excited carriers in the optical properties via a combination of tight-binding and quantum-kinetic calculations. We identify regimes where either phase-space filling or excitation-induced dephasing dominates the saturation behavior of the optical gain. The latter can lead to the emergence of a negative differential material gain.

Goldmann, E., E-mail: goldmann@itp.uni-bremen.de; Jahnke, F. [Institute for Theoretical Physics, University of Bremen, Bremen 28359 (Germany); Lorke, M.; Frauenheim, T. [Bremen Center for Computational Materials Science BCCMS, University of Bremen, Bremen 28359 (Germany)

2014-06-16T23:59:59.000Z

346

Dispersive Coupling Between the Superconducting Transmission Line Resonator and the Double Quantum Dots  

E-Print Network [OSTI]

Realization of controllable interaction between distant qubits is one of the major problems in scalable solid state quantum computing. We study a superconducting transmission line resonator (TLR) as a tunable dispersive coupler for the double-dot molecules. A general interaction Hamiltonian of $n$ two-electron spin-based qubits and the TLR is presented, where the double-dot qubits are biased at the large detuning region and the TLR is always empty and virtually excited. Our analysis o the main decoherence sources indicates that various major quantum operations can be reliably implemented with current technology.

Guo-Ping Guo; Hui Zhang; Yong Hu; Tao Tu; Guang-Can Guo

2008-02-10T23:59:59.000Z

347

Improving PbS Quantum Dot Solar Cell Power Conversion Efficiency to an NREL-Certified 4.4% (Fact Sheet)  

SciTech Connect (OSTI)

Transition metal oxide improves overall efficiency and maintains performance with inexpensive metals. A research team at the National Renewable Energy Laboratory (NREL) has demonstrated that inserting a transition metal oxide (TMO) between the lead sulfide (PbS) quantum dot (QD) layer and the metal electrode eliminates the Schottky barrier that impedes efficient hole extraction and thereby improves the overall conversion efficiency. This allows for inexpensive metals such as Al to be employed without loss of performance. n-type TMOs consisting of molybdenum oxide (MoO{sub x}) and vanadium oxide (V{sub 2}O{sub x}) were used as an efficient hole extraction layer (HEL) in heterojunction ZnO/PbS QD solar cells. A 4.4% NREL-certified device was reported based on the MoO{sub x} HEL with Al as the back contact material, representing a more than 65% efficiency improvement compared with the case of Au contacting the PbS QD layer directly. The team finds the acting mechanism of the HEL to be a dipole formed at the MoO{sub x} and PbS interface, which enhances band bending to allow efficient hole extraction from the valence band of the PbS layer by MoO{sub x}. The carrier transport to the metal anode is likely enhanced through shallow gap states in the MoO{sub x} layer.

Not Available

2012-01-01T23:59:59.000Z

348

SunLine Transit Agency Fuel Cell Transit Bus: Fifth Evaluation...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Fuel Cell Transit Bus: Fifth Evaluation Report SunLine Transit Agency Fuel Cell Transit Bus: Fifth Evaluation Report This report describes operations at SunLine Transit Agency for...

349

Selenophene transition metal complexes  

SciTech Connect (OSTI)

This research shows that selenophene transition metal complexes have a chemistry that is similar to their thiophene analogs. Selenophene coordination has been demonstrated and confirmed by molecular structure in both the {eta}{sup 5}- and the {eta}{sup 1}(Se)-coordination modes. The reaction chemistry of selenophene complexes closely resembles that of the analogous thiophene complexes. One major difference, however, is that selenophene is a better donor ligand than thiophene making the selenophene complexes more stable than the corresponding thiophene complexes. The {sup 77}Se NMR chemical shift values for selenophene complexes fall within distinct regions primarily depending on the coordination mode of the selenophene ligand. In the final paper, the C-H bond activation of {eta}{sup 1}(S)-bound thiophenes, {eta}{sup 1}(S)-benzothiophene and {eta}{sup 1}(Se)-bound selenophenes has been demonstrated. The deprotonation and rearrangement of the {eta}{sup 1}(E)-bound ligand to the carbon bound L-yl complex readily occurs in the presence of base. Reprotonation with a strong acid gives a carbene complex that is unreactive towards nucleophilic attack at the carbene carbon and is stable towards exposure to air. The molecular structure of [Cp(NO)(PPh{sub 3})Re(2-benzothioenylcarbene)]O{sub 3}SCF{sub 3} was determined and contains a Re-C bond with substantial double bond character. Methyl substitution for the thienylcarbene or selenylcarbene gives a carbene that rearranges thermally to give back the {eta}{sup 1}(E)-bound complex. Based on these model reactions, a new mechanism for the H/D exchange of thiophene over the hydrodesulfurization catalyst has been proposed.

White, C.J.

1994-07-27T23:59:59.000Z

350

Ising model: secondary phase transition  

E-Print Network [OSTI]

Lttice-spin phonons are considered, which make the heat capacity at the critical temperature satisfy experimental observations better. There is a BEC phase transition in an Ising model attributable to the lattice-spin phonons. We proved that the spin-wave theory only is available after BEC transition, and the magnons have the same characteristics as the lattice-spin phonons', resulting from quantum effect. Energy-level overlap effect at ultralow temperature is found. A prediction of BEC phase transition in a crystal is put forward as our theory generalization.

You-gang Feng

2012-04-09T23:59:59.000Z

351

Energy transport in the solar transition layer  

Science Journals Connector (OSTI)

...research-article Research Article Energy transport in the solar transition layer J...emission measure in the solar transition layer, which...the heat transport. solar transition layer|differential emission measure|energy transport|ion-acoustic...

2001-01-01T23:59:59.000Z

352

Alternative Fuels Data Center: Mass Transit  

Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

Mass Transit to Mass Transit to someone by E-mail Share Alternative Fuels Data Center: Mass Transit on Facebook Tweet about Alternative Fuels Data Center: Mass Transit on Twitter Bookmark Alternative Fuels Data Center: Mass Transit on Google Bookmark Alternative Fuels Data Center: Mass Transit on Delicious Rank Alternative Fuels Data Center: Mass Transit on Digg Find More places to share Alternative Fuels Data Center: Mass Transit on AddThis.com... More in this section... Idle Reduction Parts & Equipment Maintenance Driving Behavior Fleet Rightsizing System Efficiency Ridesharing Mass Transit Active Transit Multi-Modal Transportation Telework Mass Transit Passenger-Miles per Gallon Passenger-miles per gallon (pmpg) is a metric for comparing mass transit and rideshare with typical passenger vehicle travel. Transportation system

353

Alternative Fuels Data Center: Active Transit  

Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

Active Transit to Active Transit to someone by E-mail Share Alternative Fuels Data Center: Active Transit on Facebook Tweet about Alternative Fuels Data Center: Active Transit on Twitter Bookmark Alternative Fuels Data Center: Active Transit on Google Bookmark Alternative Fuels Data Center: Active Transit on Delicious Rank Alternative Fuels Data Center: Active Transit on Digg Find More places to share Alternative Fuels Data Center: Active Transit on AddThis.com... More in this section... Idle Reduction Parts & Equipment Maintenance Driving Behavior Fleet Rightsizing System Efficiency Ridesharing Mass Transit Active Transit Multi-Modal Transportation Telework Active Transit Photo of people riding bikes. Active transit is human-powered transportation such as biking and walking. Active transportation eliminates vehicle miles traveled altogether, so this

354

Cryogenic spectroscopy of ultra-low density colloidal lead chalcogenide quantum dots on chip-scale optical cavities towards single quantum dot near-infrared cavity QED  

E-Print Network [OSTI]

We present evidence of cavity quantum electrodynamics from a sparse density of strongly quantum-confined Pb-chalcogenide nanocrystals (between 1 and 10) approaching single-dot levels on moderately high-Q mesoscopic silicon optical cavities. Operating at important near-infrared (1500-nm) wavelengths, large enhancements are observed from devices and strong modifications of the QD emission are achieved. Saturation spectroscopy of coupled QDs is observed at 77K, highlighting the modified nanocrystal dynamics for quantum information processing.

Ranojoy Bose; Jie Gao; James F. McMillan; Alex D. Williams; Chee Wei Wong

2008-12-01T23:59:59.000Z

355

Process for Transition of Responsibilities | Department of Energy  

Office of Environmental Management (EM)

for Transition of Responsibilities Process for Transition of Responsibilities Process for Transition of Responsibilities (Waste Management Conference 2006) Process for Transition...

356

Fuel Cell Transit Bus Coordination and Evaluation Plan California...  

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

Transit Bus Coordination and Evaluation Plan California Fuel Cell Transit Evaluation Team Fuel Cell Transit Bus Coordination and Evaluation Plan California Fuel Cell Transit...

357

Development of Site Transition Plan, Use of the Site Transition Framework,  

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

Development of Site Transition Plan, Use of the Site Transition Development of Site Transition Plan, Use of the Site Transition Framework, and Terms and Conditions for Site Transition Development of Site Transition Plan, Use of the Site Transition Framework, and Terms and Conditions for Site Transition This memorandum provides additional guidance on preparation of the Site Transition Plan (STP). Development of Site Transition Plan, Use of the Site Transition Framework, and Terms and Conditions for Site Transition More Documents & Publications Site Transition Summary: Cleanup Completion to Long-Term Stewardship at Department of Energy On-going Mission Sites Process for Transition of Responsibilities Process for Transition of Uranium Mill Tailings Radiation Control Act Title II Disposal Sites to the U.S. Department of Energy Office of Legacy

358

Site Transition Framework | Department of Energy  

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

(April 2004) Site Transition Framework More Documents & Publications Process for Transition of Uranium Mill Tailings Radiation Control Act Title II Disposal Sites to the...

359

Transition Strategies for 2006 and 2007  

Broader source: Energy.gov [DOE]

Presentation on Transition Strategies given by Sigmund Gronich of the U.S. Department of Energy during the DOE Hydrogen Transition Analysis Workshop on January 26, 2006.

360

Records and Information Management Transition Guidance (November...  

Energy Savers [EERE]

Records and Information Management Transition Guidance (November 2013) Records and Information Management Transition Guidance (November 2013) This guidance document establishes a...

Note: This page contains sample records for the topic "gray dots transitioning" 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

Building America Expert Meeting Report: Transitioning Traditional...  

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

Transitioning Traditional HVAC Contractors to Whole House Performance Contractors Building America Expert Meeting Report: Transitioning Traditional HVAC Contractors to Whole House...

362

Optical Transitions in Monolayer and Bilayer Graphene  

Science Journals Connector (OSTI)

Optical transitions in grapheme are studied by infrared spectroscopy. The interband transitions in graphene monolayers show a relatively flat spectrum, while those in bilayers are...

Wang, Feng; Zhang, Yuanbo; Tian, Chuanshan; Girit, Caglar; Zettl, Alex; Shen, Y Ron

363

Enterprise Architecture Transition Plan - April 2011 | Department...  

Office of Environmental Management (EM)

Enterprise Architecture Transition Plan - April 2011 Enterprise Architecture Transition Plan - April 2011 DOE ETP Submission040411.docx More Documents & Publications Impacts of...

364

Nonisothermal Multifluid Transition to Equilibrium  

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

Nonisothermal Multifluid Transition to Equilibrium Nonisothermal Multifluid Transition to Equilibrium Processes of interest to the simulation of CH 4 production from gas hydrates in porous media include multifluid flow and heat transport along with complex phase transitions, including hydrate dissociation and formation. Before executing problems with the additional complexities involved with the gas hydrate phase, a base case problem has been designed to examine the numerical simulation of multifluid flow and heat transport processes with a single phase transition from aqueous saturated to unsaturated conditions for a water-CH 4 system outside the stability region for gas hydrate formation. The problem involves a horizontal one-dimensional closed domain (no flow boundary conditions), initialized with gradients in aqueous pressure, gas

365

SUBSIDY ENERGY EMPLOYEES TRANSIT (SEET)  

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

SUBSIDY ENERGY EMPLOYEES TRANSIT (SEET) SUBSIDY ENERGY EMPLOYEES TRANSIT (SEET) Decrease in the Transit Subsidy Per The American Taxpayer Relief Act of 2012, the maximum amount for the Transit Subsidy is due to decrease from $245 to $130 a month. This change is scheduled to take effect on January 1, 2014. Outlined below are actions that you must take to purchase your fare for January 2014. SmarTrip less than $130.00 Per Month No Action Required SmarTrip greater than $130.00 Per Month Action Required SmarTrip Participants The new amount of $130 will post to your Smart Benefits account the first time you touch your card to a SmarTrip target in January 2014. You must ensure that there is money in your personal account. Metro will deduct fare from your personal account once the Smart Benefits

366

AEC and Oak Ridge Transitions  

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

States arsenal. The transition for X-10 from the Graphite Reactor to being named the Oak Ridge National Laboratory on February 1, 1948 was not as smooth or as easily defined....

367

Roughening Transitions in HCP Lattices  

Science Journals Connector (OSTI)

Direct observation of three equilibrium roughening transitions (at about one degree Kelvin)...4...was possible because equilibrium between the solid and superfluid phases of helium can be reached on the scale of ...

J. Adler; A. Hashibon; S. G. Lipson

1998-01-01T23:59:59.000Z

368

Optical transitions in carbon nanotubes  

Science Journals Connector (OSTI)

Analytical expressions for the optical matrix elements of semiconducting carbon nanotubes are obtained for different polarizations of the incident light. It is shown that, for the light polarized along the nanotube axis and transitions between the extrema of electronic subbands, the optical matrix element only weakly depends on the nanotube chirality and excitation energy. It is found that, for the light polarized in the plane perpendicular to the nanotube axis, both v2?c1 and v1?c2 transitions are allowed.

S. V. Goupalov

2005-11-03T23:59:59.000Z

369

Functionalized Quantum Dots for Biosensing and Bioimaging and Concerns on Toxicity  

Science Journals Connector (OSTI)

In addition, recent concerns on the potential toxic effects of QDs are described as a general guidance for the development on QD formulations in future studies. ... (54) By using this delivery method, individual kinesin motor proteins in HeLa cells were imaged by bioconjugated QDs at single molecule resolution. ... Tracking Individual Kinesin Motors in Living Cells Using Single Quantum-Dot Imaging ...

Yucheng Wang; Rui Hu; Guimiao Lin; Indrajit Roy; Ken-Tye Yong

2013-02-08T23:59:59.000Z

370

DOT/UFO Emerges as a Key Factor in Inflorescence Patterning  

Science Journals Connector (OSTI)

...August 2008 IN THIS ISSUE IN THIS ISSUE DOT/UFO Emerges as a Key Factor in Inflorescence...homolog of Arabidopsis UNUSUAL FLORAL ORGANS (UFO), which appears to play a minor role in...Meyerowitz (1995) characterized Arabidopsis ufo mutants and concluded that UFO and LFY likely...

Nancy A. Eckardt

2008-08-29T23:59:59.000Z

371

NASA Conference Publication 10139, Part 1 DOT /FAA/RD-94 / 14-I  

E-Print Network [OSTI]

NASA Conference Publication 10139, Part 1 DOT /FAA/RD-94 / 14-I Airborne Windshear Detection. Delnore Lockheed Engineering & Sciences Company · Hampton, Virginia (NASA-CP-10139-Pt-I) AIRBORNE WINDSHE (NASA. Langley Research Center) _5 p N95-I05o6 --THRU-- N95-I0572 unclas G3/03 001605? Proceedings

Zhang, Yan

372

Performance study of CdS/Co-Doped-CdSe quantum dot sensitized solar cells  

Science Journals Connector (OSTI)

In order to optimize the charge transfer path in quantum dot sensitized solar cells (QDSCs), we employed successive ionic layer adsorption and reaction method to dope CdSe with Co for fabricating CdS/Co-doped-CdSe QDSCs constructed with CdS/Co-doped-CdSe ...

Xiaoping Zou, Sheng He, Gongqing Teng, Chuan Zhao

2014-01-01T23:59:59.000Z

373

A Study Of Semiconductor Quantum Dots In The Application To Terahertz Sensors  

E-Print Network [OSTI]

A Study Of Semiconductor Quantum Dots In The Application To Terahertz Sensors Raymond Davis M and referenced as part of background information used in this project. Raymond Davis October 1, 2011 ii #12 sensors. For detection of terahertz radia- tion we probe charge excitations of QDs caused

Sheldon, Nathan D.

374

PHYSICAL REVIEW B 85, 085117 (2012) Spin thermopower in interacting quantum dots  

E-Print Network [OSTI]

current without accompanying charge current. For temperatures and fields at or above the Kondo temperature, we relate the spin-Seebeck coefficient to the charge-Seebeck coefficient of a negative-U quantum dot applications, including power generation, refrigeration, and temperature measurement.1 Thermoelectric phenomena

Ramsak, Anton

375

Electrical and Thermal Conductivity of Ge/Si Quantum Dot Superlattices  

E-Print Network [OSTI]

. Good carrier mobility and electric con- ductivity are important for thermoelectric materials where-Riverside, Riverside, California 92521, USA Recently proposed thermoelectric applications of quantum dot superlattices made of different material systems depend crucially on the values of the electrical and thermal

376

Rapid degradation of CdSe/ZnS colloidal quantum dots exposed to gamma irradiation  

E-Print Network [OSTI]

on irradiation dose. CdSe/ZnS quantum dots show poor radiation hardness, and severely degrade after less than 20 of light sources to ionizing radiation, it is important to know the levels of irradiation that would de of applica- tions ranging from optoelectronic through photocatalytic to biomedical, including applications

New Mexico, University of

377

Colloidal PbS Quantum Dot Solar Cells with High Fill Factor  

E-Print Network [OSTI]

Colloidal PbS Quantum Dot Solar Cells with High Fill Factor Ni Zhao, Tim P. Osedach,, Liang,§ and Vladimir Bulovic, * Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, School of Engineering and Applied Sciences, Harvard University

378

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

SciTech Connect (OSTI)

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

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

2014-03-21T23:59:59.000Z

379

Hierarchically Structured ZnO Nanorods-Nanosheets for Improved Quantum-Dot-Sensitized Solar Cells  

E-Print Network [OSTI]

). This hierarchical structure had two advantages in improving the power conversion efficiency (PCE) of the solar cells. INTRODUCTION The establishment of low-cost and high-performance solar cells for sustainable energy sourcesHierarchically Structured ZnO Nanorods-Nanosheets for Improved Quantum-Dot-Sensitized Solar Cells

Cao, Guozhong

380

FEW ELECTRON QUANTUM DOTS IN InAs/InP CORE SHELL NANOWIRES  

E-Print Network [OSTI]

..." Much effort is being directed at harnessing the potential power of quantum com- puting [7]. At the turn electric field (EDSR) is expected to be orders of magnitudes faster. To this effect, InAs nanowires with a thin shell of InP, are explored as a system where a quantum dot can be defined and probed electrically

Nygård, Jesper

Note: This page contains sample records for the topic "gray dots transitioning" 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

Frster resonance energy transfer enhanced color-conversion using colloidal semiconductor quantum dots for solid  

E-Print Network [OSTI]

F�rster resonance energy transfer enhanced color-conversion using colloidal semiconductor quantum August 2009; published online 15 October 2009 In this paper, we present F�rster resonance energy transfer FRET -enhanced color-conversion using colloidal semiconductor quantum dot nanocrystals NCs to make

Demir, Hilmi Volkan

382

Accurate determination of energy scales in few-electron double quantum dots D. Taubert,1  

E-Print Network [OSTI]

methods to determine the gate voltage to energy conversion accurately in the different regimes of dot-lead tunnel couplings and demonstrate strong variations of the conversion factors. Our concepts can easily involves a conversion of the applied gate voltages to energy differences between the electronic states

Ludwig-Maximilians-Universität, München

383

Lead-position dependent regular oscillations and random fluctuations of conductance in graphene quantum dots  

E-Print Network [OSTI]

Lead-position dependent regular oscillations and random fluctuations of conductance in graphene.1088/0953-8984/25/8/085502 Lead-position dependent regular oscillations and random fluctuations of conductance in graphene quantum, for graphene quantum dots, the conductance variations with the lead positions. Since for graphene the types

Lai, Ying-Cheng

384

Microwave accelerated one-minute synthesis of luminescent ZnO quantum dots  

Science Journals Connector (OSTI)

In this paper we present microwave assisted non-aqueous synthesis of ZnO quantum dots (QDs) by hydrolyzing zinc acetate with lithium hydroxide in ethanol under microwave heating. The processing time for QDs was reduced to few minutes when compared with time consuming solgel chemistry. The prepared QDs show good colloidal stability along with stable visible emission.

Adersh Asok; A. R. Kulkarni; Mayuri N. Gandhi

2013-01-01T23:59:59.000Z

385

Synthesis and optical properties of cadmium selenide quantum dots for white light-emitting diode application  

SciTech Connect (OSTI)

Highlights: ? Stable CdSe QDs were synthesized by the one-step and two-level process respectively. ? The fabricated white LEDs show good white balance. ? CdSe QDs present well green to yellow band luminescence. ? CdSe QDs displayed a broad excitation band. - Abstract: Yellow light-emitting cadmium selenide quantum dots were synthesized using one-step and two-step methods in an aqueous medium. The structural luminescent properties of these quantum dots were investigated. The obtained cadmium selenide quantum dots displayed a broad excitation band suitable for blue or near-ultraviolet light-emitting diode applications. White light-emitting diodes were fabricated by coating the cadmium selenide samples onto a 460 nm-emitting indium gallium nitrite chip. Both samples exhibited good white balance. Under a 20 mA working current, the white light-emitting diode fabricated via the one-step and two-step methods showed Commission Internationale de lclairage coordinates at (0.27, 0.23) and (0.27, 0.33), respectively, and a color rendering index equal to 41 and 37, respectively. The one-step approach was simpler, greener, and more effective than the two-step approach. The one-step approach can be enhanced by combining cadmium selenide quantum dots with proper phosphors.

Xu, Xianmei; Wang, Yilin; Gule, Teri; Luo, Qiang [School of Chemistry and Chemical Engineering, Guangxi University, Nanning 53000 (China); Zhou, Liya, E-mail: zhouliyatf@163.com [School of Chemistry and Chemical Engineering, Guangxi University, Nanning 53000 (China); Gong, Fuzhong [School of Chemistry and Chemical Engineering, Guangxi University, Nanning 53000 (China)

2013-03-15T23:59:59.000Z

386

Intersubband absorption in boron-doped multiple Ge quantum dots J. L. Liu,a)  

E-Print Network [OSTI]

Intersubband absorption in boron-doped multiple Ge quantum dots J. L. Liu,a) W. G. Wu, A. Balandin; accepted for publication 3 November 1998 The intersubband absorption in self-assembled boron-doped multiple and undoped Si barriers. The infrared absorption as a function of wavelength is measured by Fourier transform

387

Tuning the optical properties of dilute nitride site controlled quantum dots  

SciTech Connect (OSTI)

We show that deterministic control of the properties of pyramidal site-controlled quantum dots (QD) could be achieved by exposing the QD layer to nitrogen precursor unsymmetrical dimethylhydrazine (UDMHy). The properties that could be tuned include an expected emission reduction in dilute nitride materials, excitonic pattern (biexciton binding energy) and improved carrier confinement potential symmetry (reduced fine-structure splitting)

Juska, G.; Dimastrodonato, V.; Mereni, L. O.; Gocalinska, A.; Pelucchi, E. [Tyndall National Institute, University College Cork, Lee Maltings, Cork (Ireland)

2013-12-04T23:59:59.000Z

388

Universal Non-adiabatic Holonomic Gates in Quantum Dots and Single-Molecule Magnets  

E-Print Network [OSTI]

Geometric manipulation of a quantum system offers a method for fast, universal, and robust quantum information processing. Here, we propose a scheme for universal all-geometric quantum computation using non-adiabatic quantum holonomies. We propose three different realizations of the scheme based on an unconventional use of quantum dot and single-molecule magnet devices, which offer promising scalability and robust efficiency.

Vahid Azimi Mousolou; Carlo M. Canali; Erik Sjqvist

2012-09-17T23:59:59.000Z

389

Energy Transfer from an Individual Quantum Dot to a Carbon Nanotube  

E-Print Network [OSTI]

saturation of the energy transfer efficiency at 96%, seemingly independent of CNT chirality. KEYWORDS NanoEnergy Transfer from an Individual Quantum Dot to a Carbon Nanotube Eyal Shafran, Benjamin D. Mangum, and Jordan M. Gerton* Department of Physics and Astronomy, University of Utah, Salt Lake City

Gerton, Jordan M.

390

Study of the self-organization processes in lead sulfide quantum dots  

SciTech Connect (OSTI)

A procedure is described for the synthesis of nanoparticles based on lead chalcogenides. The procedure combines the synthesis of colloidal quantum dots (QDs) in aqueous solutions with simultaneous organization of the QDs into ordered arrays. The processes of the self-organization of QDs are analyzed at the nano- and microscopic levels by the photoluminescence method, atomic-force microscopy, and optical microscopy.

Tarasov, S. A., E-mail: SATarasov@mail.ru; Aleksandrova, O. A.; Maksimov, A. I.; Maraeva, E. V.; Matyushkin, L. B.; Menkovich, E. A.; Moshnikov, V. A. [St. Petersburg Electrotechnical University LETI (Russian Federation); Musikhin, S. F. [St. Petersburg State Polytechnic University (Russian Federation)

2014-12-15T23:59:59.000Z

391

Ambient-Processed Colloidal Quantum Dot Solar Cells via Individual Pre-Encapsulation of Nanoparticles  

E-Print Network [OSTI]

Ambient-Processed Colloidal Quantum Dot Solar Cells via Individual PreVersity of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada, and Department of Materials Science and Engineering, UniVersity of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada Received February 24

392

Prospective Article Materials processing strategies for colloidal quantum dot solar cells  

E-Print Network [OSTI]

Prospective Article Materials processing strategies for colloidal quantum dot solar cells: advances and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada Kang, Toronto, Ontario M5S 3G4, Canada Address all correspondence to Edward H. Sargent at ted

393

UltraDots Inc formely UltraPhotonics | Open Energy Information  

Open Energy Info (EERE)

UltraDots Inc formely UltraPhotonics UltraDots Inc formely UltraPhotonics Jump to: navigation, search Name UltraDots Inc (formely UltraPhotonics ) Place Fremont, California Zip CA 94539 Product Nanotechnology company developing "quantum dot" technology for a range of energy, communications and medical applications. Originally included photovoltaics, but this application seems to no longer be the focus. Coordinates 44.2605°, -88.880509° 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":44.2605,"lon":-88.880509,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

394

Cu2ZnSnS4 nanocrystals and graphene quantum dots for photovoltaics Xukai Xinab  

E-Print Network [OSTI]

Cu2ZnSnS4 nanocrystals and graphene quantum dots for photovoltaics Jun Wang,a Xukai Xinab advances in the synthesis and utilization of CZTS nanocrystals and colloidal GQDs for photovoltaics emerged to achieve low cost, high perfor- mance photovoltaics, including organic solar cells,2­6 dye

Lin, Zhiqun

395

Single-photon emission from the natural quantum dots in the InAs/GaAs wetting layer  

Science Journals Connector (OSTI)

A time-resolved microphotoluminescence study is presented for quantum dots that are formed in the InAs/GaAs wetting layer. These dots are due to fluctuations of In composition in the wetting layer. They show spectrally sharp luminescence lines with a low spatial density. We identify lines related to neutral exciton and biexciton as well as trions. Exciton emission antibunching [second-order correlation value of g(2)(0)=0.16] and a biexciton-exciton emission cascade prove nonclassical emission from the dots and confirm their potential as single-photon sources.

T. Kazimierczuk; A. Golnik; P. Kossacki; J. A. Gaj; Z. R. Wasilewski; A. Babi?ski

2011-09-26T23:59:59.000Z

396

Formal Transition in Agent Organizations Eric Matson  

E-Print Network [OSTI]

, the company's management must understand the methodology and process of transition, or more generally termedFormal Transition in Agent Organizations Eric Matson Department of Computer Science and Engineering define organization transition. Specifically, we describe a formal process of organi- zation transition

Deloach, Scott A.

397

The metalinsulator transition: a perspective  

Science Journals Connector (OSTI)

...transition in condensed phases. Phys. Rev. B...M. J. 1982 The transition to the metallic...metalnon-metal transition in expanded metals...of electrons and ions in condensed matter...The metalnonmetal transition in disordered systems...1996c The changing phase of expanded metals...

1998-01-01T23:59:59.000Z

398

Semiconductor-To-Metal Transitions in Transition-Metal Compounds  

Science Journals Connector (OSTI)

The theory presented in a previous paper is applied to the transition-metal compounds which are known to exhibit semiconductor-to-metal transitions. In particular, the predictions of the theory are compared with the experimental results of Feinleib and Paul on V2O3. Very good agreement is obtained for the magnitude of the energy gap and for its pressure and stress coefficients. The theory appears to be consistent with the available data on the other oxides of vanadium and titanium as well. Band models for all of these compounds are suggested. The effects of spin-disorder scattering and broadening, polaron formation, and non-stoichiometry are considered quantitatively.

David Adler; Julius Feinleib; Harvey Brooks; William Paul

1967-03-15T23:59:59.000Z

399

FTA- SunLine Transit Agency- Final Report  

Broader source: Energy.gov [DOE]

Final Report on the Federal Transit Administration, SunLine Transit Agency Cooperative Agreement (Part One)

400

[Ta{sub 6}Cl{sub 12}(PrCN){sub 6}][(Ta{sub 6}Cl{sub 12})Cl{sub 6}]{center{underscore}dot}2PrCn, a compound with homonuclear mixed-charge cluster units [Ta{sub 6}Cl{sub 12}]{sup 2+} and [Ta{sub 6}Cl{sub 12}]{sup 4+}  

SciTech Connect (OSTI)

In transition metal cluster chemistry, compounds consisting of both a cluster cation and a cluster anion are not very common. The first members of this type of compound of the composition [M{sub 6}X{sub 12}(EtOH){sub 6}][(Mo{sub 6}Cl{sub 8})Cl{sub 4}X{sub 2}]{center{underscore}dot}mEtOH{center{underscore}dot}nEt{sub 2}O (M = Nb, Ta; X = Cl, Br) have been recently prepared. Crystal structure determinations for [Nb{sub 6}Cl{sub 12}(EtOH){sub 6}][(Mo{sub 6}Cl{sub 8})Cl{sub 6}]{center{underscore}dot}3EtOH{center{underscore}dot}3Et{sub 2}O and [Ta{sub 6}Cl{sub 12}(EtOH){sub 6}][(Mo{sub 6}Cl{sub 8})Cl{sub 6}]{center{underscore}dot}6EtOH revealed the presence of two different hexanuclear cluster cores; namely, the [M{sub 6}X{sub 12}(EtOH){sub 6}]{sup 2+} cluster cations and the [(Mo{sub 6}Cl{sub 8})Cl{sub 4}X{sub 2}]{sup 2{minus}} cluster anions. In fact, these compounds consist of two different heteronuclear cluster units with different charges: [M{sub 6}X{sub 12}]{sup 2+} in the cation and [Mo{sub 6}Cl{sub 8}]{sup 4+} in the anion. The preparation of cation-anion pairs with homonuclear mixed-charge cluster units is also possible. In the present study, the synthesis and crystal structure of the cluster pair [Ta{sub 6}Cl{sub 12}(PrCN){sub 6}][(Ta{sub 6}Cl{sub 12})Cl{sub 6}]{center{underscore}dot}2PrCN is reported. The compound is built of two octahedral homonuclear mixed-charge cluster units: [Ta{sub 6}Cl{sub 12}]{sup 2+} in the [Ta{sub 6}Cl{sub 12}(PrCN){sub 6}]{sup 2+} cluster cation and [Ta{sub 6}Cl{sub 12}]{sup 4+} in the [(Ta{sub 6}Cl{sub 12})Cl{sub 6}]{sup 2{minus}} cluster anion.

Brnicevic, N.; Sirac, S.; Basic, I.; Zhang, Z.; McCarley, R.E.; Guzei, I.A.

1999-09-06T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

Enhanced photorefractive performance in CdSe quantum-dot-dispersed poly(styrene-co-acrylonitrile) polymers  

SciTech Connect (OSTI)

This paper reports on the enhanced photorefractive behavior of a CdSe quantum-dot-dispersed less expensive polymer of poly(styrene-co-acrylonitrile). The capability of CdSe quantum dots used as photosensitizers and the associated photorefractive performance are characterized through a photocurrent experiment and a two-beam coupling experiment, respectively. An enhanced two-beam coupling gain coefficient of 12.2 cm{sup -1} at 46 V/mum was observed owning to the reduced potential barrier. The photorefractive performance per CdSe quantum dot is three orders of magnitude higher than that in the sample sensitized by trinitrofluorenone in poly(styrene-co-acrylonitrile), and almost ten times higher than that in the CdSe quantum-dot-sensitized poly(N-vinylcarbazole) polymers.

Li Xiangping; Embden, Joel van; Chon, James W. M.; Gu Min [Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, Victoria 3122 (Australia); Evans, Richard A. [CSIRO Molecular and Health Technologies, Bag 10, Clayton South, Victoria 3169 (Australia)

2010-06-21T23:59:59.000Z

402

Layer-by-layer surface manipulation and biointegration of quantum dots : assembly of nanostructured DNA delivery vehicles  

E-Print Network [OSTI]

Objectives: The aims of this investigation are to (i) prepare hybrid quantum dot (QD)-polymer compleses, (ii) maniplulate structural and chemical properties of the hybrids and characterize their effects on biocompatibility, ...

Jaffar, Saeeda Mahdi

2005-01-01T23:59:59.000Z

403

Green Dot Program--Gain leadership skills, explore sensitive topics, and help reduce the number of power  

E-Print Network [OSTI]

Green Dot Program-- Gain leadership skills, explore sensitive topics, and help reduce the number cars, and resource tables with safety information and more. When: Tue, Sept. 16th at 11AM (2 hours

404

Development of a Bioorthogonal and Highly Efficient Conjugation Method for Quantum Dots using Tetrazine-Norbornene Cycloaddition  

E-Print Network [OSTI]

We present a bioorthogonal and modular conjugation method for efficient coupling of organic dyes and biomolecules to quantum dots (QDs) using a norbornene?tetrazine cycloaddition. The use of noncoordinating functional ...

Han, Hee-Sun

405

Physica E 34 (2006) 15 Single-shot readout of electron spins in a semiconductor quantum dot  

E-Print Network [OSTI]

states in a semiconductor quantum dot that is robust against charge noise and can be used even when readout (E-RO), the spin levels are positioned around the electrochemical potential of the reservoir mres

406

Role of surface states and defects in the ultrafast nonlinear optical properties of CuS quantum dots  

SciTech Connect (OSTI)

We report facile preparation of water dispersible CuS quantum dots (24 nm) and nanoparticles (511 nm) through a nontoxic, green, one-pot synthesis method. Optical and microstructural studies indicate the presence of surface states and defects (dislocations, stacking faults, and twins) in the quantum dots. The smaller crystallite size and quantum dot formation have significant effects on the high energy excitonic and low energy plasmonic absorption bands. Effective two-photon absorption coefficients measured using 100 fs laser pulses employing open-aperture Z-scan in the plasmonic region of 800 nm reveal that CuS quantum dots are better ultrafast optical limiters compared to CuS nanoparticles.

Mary, K. A. Ann; Unnikrishnan, N. V., E-mail: nvu100@yahoo.com [School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686560 (India); Philip, Reji [Light and Matter Physics Group, Raman Research Institute, C.V. Raman Avenue, Sadashivanagar, Bangalore 560080 (India)

2014-07-01T23:59:59.000Z

407

Lab transitions employee giving campaigns  

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

Lab transitions employee giving campaigns Lab transitions employee giving campaigns Community Connections: Our link to Northern New Mexico Communities Latest Issue:Dec. 2013 - Jan. 2014 All Issues » submit Lab transitions employee giving campaigns This year's theme: "I Give Because..." November 1, 2013 Employee Giving Logo The theme for this year's employee giving campaigns Contact Community Programs Office Director Kurt Steinhaus Email Editor Linda Anderman Email During the past seven years contributions to the Lab's annual employee giving campaign have risen by 370 percent and hopes to surpass the $3.1 million amount collected last year. As in past years, that amount includes a $1 million dollar match from the Lab's manager, Los Alamos National Security, LLC (LANS). The funds support nonprofits within the region and

408

Pressure-Induced Phase Transition in Guanidinium Perchlorate: A Supramolecular Structure Directed by Hydrogen Bonding and Electrostatic Interactions  

SciTech Connect (OSTI)

In situ Raman spectroscopy and synchrotron X-ray diffraction (XRD) experiments have been performed to investigate the response of guanidinium perchlorate (C(NH{sub 2}){sub 3}{sup +} {center_dot} ClO{sub 4}{sup -}, GP) to high pressures of {approx}11 GPa. GP exhibits a typical supramolecular structure of two-dimensional (2D) hydrogen-bonded ionic networks at ambient conditions. A subtle phase transition, accompanied by the symmetry transformation from R3m to C2, has been confirmed by obvious changes in both Raman and XRD patterns at 4.5 GPa. The phase transition is attributed to the competition between hydrogen bonds and close packing of the supramolecular structure at high pressure. Hydrogen bonds have been demonstrated to evolve into a distorted state through the phase transition, accompanied by the reduction in separation of oppositely charged ions in adjacent sheet motifs. A detailed mechanism of the phase transition, as well as the cooperativity between hydrogen bonding and electrostatic interactions, is discussed by virtue of the local nature of the structure.

Li, Shourui; Li, Qian; Wang, Kai; Tan, Xiao; Zhou, Mi; Li, Bing; Liu, Bingbing; Zou, Guangtian; Zou, Bo (Jilin)

2012-01-20T23:59:59.000Z

409

DOE Transition Documents - 2008 | Department of Energy  

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

Transition Documents - 2008 Transition Documents - 2008 DOE Transition Documents - 2008 Following are the DOE Transition Documents - 2008 Files in PDF format 2008_Transition_Corporate_Overview_Book_One.pdf 2008_Transition_Important_Issues_Book_Two.pdf 2008_Transition_Program_Details_Book_Three.pdf 2008_Transition_Budget_Details_Book_Four.pdf Authorize_Changes_Contractor_Work_Force_Restructuring_Policy.pdf Compilation Congressional Correspondence, January 1, 2008 throught November 14, 2008 COMPILATION OF MEMORANDA OF UNDERSTANDING AND INTERAGENCY AGREEMENTS DOE Transition Team President-Elect's 2008 Compliance_Policies_Guidance_Contractor__Force_Restructuring.pdf DOE_Contractor_Work_Force_Restructuring_Approval_Thresholds.pdf DOE_Selects_Savannah_River_Remediation__Liquid_Waste.pdf DOE STGWG Group

410

Transition-fault test generation  

E-Print Network [OSTI]

large to store in the memory of the tester. The proposed methods of test generation utilize stuck-at-fault tests to create transition-fault test sets of a smaller size. Greedy algorithms are used in the generation of both the stuck...

Cobb, Bradley Douglas

2013-02-22T23:59:59.000Z

411

The energy transition Gerald Leach  

E-Print Network [OSTI]

interest to energy supply forecasting, both history experience, have proved to be effective or for biomassThe energy transition Gerald Leach The paper considers the substitution of tradition- these restrictions, they are of great importance to al biomass fuels by modern energy sources in the consumer welfare

Kammen, Daniel M.

412

Non-Integer Quantum Transitions  

E-Print Network [OSTI]

We show that in the quantum transition of a system induced by the interaction with an intense laser of circular frequency $\\omega$, the energy difference between the initial and the final states of the system is not necessarily being an integer multiple of the quantum energy $\\hbar\\omega$.

Qi-Ren Zhang

2005-12-04T23:59:59.000Z

413

Rail Transit and Energy Consumption  

Science Journals Connector (OSTI)

...Transit and Energy Consumption In a recent issue...D.C. 20418 The Diesel's Advantages It...p. 517). The diesel car, while it has...Other types of engine can be made to meet...catalysts by using leaded fuel because it is 3 to...politically unpopular. The diesel car requires no add-on...

CHARLES A. LAVE

1977-09-02T23:59:59.000Z

414

Magnetism in amorphous transition metals  

Science Journals Connector (OSTI)

Overall features of magnetism in amorphous transition metals have been investigated on the basis of a finite-temperature theory of the local-environment effect. It is shown that the simple ferromagnetism of Fe, Co, and Ni is drastically changed by structural disorder; amorphous transition metals form spin glasses (SGs) for compositions near amorphous Fe (6.7?N?7.35), ferromagnets for compositions near amorphous Co (7.35?N?9.0), and paramagnetisms for compositions near amorphous Ni (9.0?N?10.0) where N is the number of d electrons. The SG is accompanied by formation of local ferromagnetic clusters for N?7.2, and shows reentrant behavior at the ferromagnetic boundary N?7.35. The ferromagnetism in amorphous transition metals is shown to be well explained by the main-peak position in the noninteracting densities of states. It is found that structural disorder enhances the Curie temperatures (TC) in the range 7.9?N?8.5 as compared with bcc and fcc structures. These results explain recent experimental data for the SG in Fe-rich amorphous alloys and the high TC in amorphous Co-Y alloys, but they are quite different from the early picture obtained for amorphous transition-metalmetalloid alloys.

Y. Kakehashi

1991-05-01T23:59:59.000Z

415

Two Flavour QCD Phase Transition  

E-Print Network [OSTI]

Results on the phase transition in QCD with two flavours of light staggered fermions from an ongoing simulation are presented. We find the restoration of the chiral SU(2) x SU(2) symmetry, but not of the axial U_A(1) symmetry.

G. Boyd; F. Karsch; E. Laermann; M. Oevers

1996-07-20T23:59:59.000Z

416

Extinction Transition on a Pie  

E-Print Network [OSTI]

Extinction transition of bacteria under forced rotation is analyzed in pie geometry. Under convection, separation of the radial and the azimuthal degrees of freedom is not possible, and the linearized evolution operator is diagonalized numerically. Some characteristics scales are compared with the results of recent experiments, and the ``integrable'' limit of the theory at narrow growth region is analyzed.

Nadav M. Shnerb

2000-07-04T23:59:59.000Z

418

Final LDRD report : infrared detection and power generation using self-assembled quantum dots.  

SciTech Connect (OSTI)

Alternative solutions are desired for mid-wavelength and long-wavelength infrared radiation detection and imaging arrays. We have investigated quantum dot infrared photodetectors (QDIPs) as a possible solution for long-wavelength infrared (8 to 12 {mu}m) radiation sensing. This document provides a summary for work done under the LDRD 'Infrared Detection and Power Generation Using Self-Assembled Quantum Dots'. Under this LDRD, we have developed QDIP sensors and made efforts to improve these devices. While the sensors fabricated show good responsivity at 80 K, their detectivity is limited by high noise current. Following efforts concentrated on how to reduce or eliminate this problem, but with no clear path was identified to the desired performance improvements.

Cederberg, Jeffrey George; Ellis, Robert; Shaner, Eric Arthur

2008-02-01T23:59:59.000Z

419

Transport properties of a molecular quantum dot coupled to one-dimensional correlated electrons  

Science Journals Connector (OSTI)

We analyze the transport properties of a quantum dot with a harmonic degree of freedom (Holstein phonon) coupled to interacting one-dimensional metallic leads. Using Tomonaga-Luttinger model to describe the interacting leads we construct the generating function of the full counting statistics for a specific constellation of system parameters and give explicit expression for the cumulant generating function. In the resonant case we find the lowest order correction to the current to be negative and divergent when source-drain voltage approaches the phonon frequency. Via a diagram resummation procedure we show, that these divergencies can be repealed. On the contrary, in the off-resonant case the lowest order correction remains finite. This effect can be traced back to the strongly nonmonotonic behavior of the bare transmission coefficient (without phonon) with respect to the dot level energy. We calculate corrections to the noise power as well and discuss possible experimental implications of this phenomenon.

S. Maier and A. Komnik

2010-10-18T23:59:59.000Z

420

Positioning effects on quantum dot solar cells grown by molecular beam epitaxy  

SciTech Connect (OSTI)

We report current-voltage and spectral response characteristics of high density InAs/GaAs quantum dot (QD) solar cells with different positions where dots are located. The short circuit current density (J{sub sc}), open circuit voltage (V{sub oc}), and external quantum efficiency of these cells under air mass 1.5 are presented and compared with a GaAs reference cell. An extended photoresponse in contrast to the GaAs reference cell was confirmed for all these cells. The effect of inserting QD layers into emitter and base region on device performance is shown. The J{sub sc} is reduced, while the V{sub oc} is maintained. The cell with QDs located toward the base side shows better performance, confirmed by both current-voltage and spectral response measurements.

Zhou, D.; Sharma, G.; Fimland, B. O. [Department of Electronics and Telecommunications, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim (Norway); Vullum, P. E.; Thomassen, S. F.; Holmestad, R.; Reenaas, T. W. [Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim (Norway)

2010-02-22T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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421

Pulsed laser deposition of Mn doped CdSe quantum dots for improved solar cell performance  

SciTech Connect (OSTI)

In this work, we demonstrate (1) a facile method to prepare Mn doped CdSe quantum dots (QDs) on Zn{sub 2}SnO{sub 4} photoanodes by pulsed laser deposition and (2) improved device performance of quantum dot sensitized solar cells of the Mn doped QDs (CdSe:Mn) compared to the undoped QDs (CdSe). The band diagram of photoanode Zn{sub 2}SnO{sub 4} and sensitizer CdSe:Mn QD is proposed based on the incident-photon-to-electron conversion efficiency (IPCE) data. Mn-modified band structure leads to absorption at longer wavelengths than the undoped CdSe QDs, which is due to the exchange splitting of the CdSe:Mn conduction band by the Mn dopant. Three-fold increase in the IPCE efficiency has also been observed for the Mn doped samples.

Dai, Qilin; Wang, Wenyong, E-mail: wwang5@uwyo.edu, E-mail: jtang2@uwyo.edu; Tang, Jinke, E-mail: wwang5@uwyo.edu, E-mail: jtang2@uwyo.edu [Department of Physics and Astronomy, University of Wyoming, Laramie, Wyoming 82071 (United States); Sabio, Erwin M. [Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071 (United States)

2014-05-05T23:59:59.000Z

422

Matter-wave quantum dots and antidots in ultracold atomic Bose-Fermi mixtures  

Science Journals Connector (OSTI)

The properties of ultracold atomic Bose-Fermi mixtures in external potentials are investigated and the existence of gap solitons of Bose-Fermi mixtures in optical lattices demonstrated. Using a self-consistent approach we compute the energy spectrum and show that gap solitons can be viewed as matter-wave realizations of quantum dots and antidots with the bosonic density playing the role of trapping (expulsive) potential for the fermions. The fermionic states trapped in the condensate are shown to be at the bottom of the Fermi sea and therefore well protected from thermal decoherence. Energy levels, filling factors, and parameters dependence of gap soliton quantum dots are also calculated both numerically and analytically.

Mario Salerno

2005-12-02T23:59:59.000Z

423

Strongly confining bare core CdTe quantum dots in polymeric microdisk resonators  

SciTech Connect (OSTI)

We report on a simple route to the efficient coupling of optical emission from strongly confining bare core CdTe quantum dots (QDs) to the eigenmodes of a micro-resonator. The quantum emitters are embedded into QD/polymer sandwich microdisk cavities. This prevents photo-oxidation and yields the high dot concentration necessary to overcome Auger enhanced surface trapping of carriers. In combination with the very high cavity Q-factors, interaction of the QDs with the cavity modes in the weak coupling regime is readily observed. Under nanosecond pulsed excitation the CdTe QDs in the microdisks show lasing with a threshold energy as low as 0.33 ?J.

Flatae, Assegid, E-mail: assegid.flatae@kit.edu; Grossmann, Tobias; Beck, Torsten; Wiegele, Sarah; Kalt, Heinz [Institute of Applied Physics and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str.1, 76131 Karlsruhe (Germany)

2014-01-01T23:59:59.000Z

424

High open circuit voltages of solar cells based on quantum dot and dye hybrid-sensitization  

SciTech Connect (OSTI)

A type of solar cell based on quantum dot (QD) and dye hybrid-sensitized mesoporous TiO{sub 2} film electrode was designed and reported. The electrode was consisted of a TiO{sub 2} nanoparticle (NP) thin film layer sensitized with CdS quantum dot (QD) and an amorphous TiO{sub 2} coated TiO{sub 2} NP thin film layer that sensitized with C106 dye. The amorphous TiO{sub 2} layer was obtained by TiCl{sub 4} post-treatment to improve the properties of solar cells. Research showed that the solar cells fabricated with as-prepared hybrid-sensitized electrode exhibited excellent photovoltaic performances and a fairly high open circuit voltage of 796?mV was achieved.

Zhao, Yujie; Zhao, Wanyu; Chen, Jingkuo; Li, Huayang; Fu, Wuyou, E-mail: hari@hpu.edu.cn, E-mail: fuwy56@163.com; Sun, Guang; Cao, Jianliang; Zhang, Zhanying [School of Materials Science and Engineering and Cultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province, Henan Polytechnic University, Jiaozuo 454000 (China)] [School of Materials Science and Engineering and Cultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province, Henan Polytechnic University, Jiaozuo 454000 (China); Bala, Hari, E-mail: hari@hpu.edu.cn, E-mail: fuwy56@163.com [School of Materials Science and Engineering and Cultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province, Henan Polytechnic University, Jiaozuo 454000 (China) [School of Materials Science and Engineering and Cultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province, Henan Polytechnic University, Jiaozuo 454000 (China); College of Chemistry and Chemical Engineering, Inner Mongolia University for the Nationalities, Tongliao 028043 (China)

2014-01-06T23:59:59.000Z

425

107-A load-current B-dot monitor: Simulations, design, and performance  

Science Journals Connector (OSTI)

A B-dot monitor that measures the current 6cm from the axis of dynamic loads fielded on 107-A multiterawatt pulsed-power accelerators has been developed. The monitor improves upon the multimegampere load-current gauge described in Phys. Rev. ST Accel. Beams 11, 100401 (2008). The design of the improved monitor was developed using three-dimensional particle-in-cell simulations that model vacuum electron flow in the transmission line near the monitor. The simulations include important geometric features of the B-dot probe and model the deposition of electron energy within the probe. The simulations show that the improved design reduces by as much as a factor of 5 the electron energy deposition to the interior of the monitor. Data taken on accelerator shots demonstrate that the improved monitor works as well as the original monitor on shots with low-impedance loads, and delivers superior performance on higher-impedance-load shots.

D. V. Rose; D. R. Welch; C. L. Miller; R. E. Clark; E. A. Madrid; C. B. Mostrom; T. C. Wagoner; J. K. Moore; W. A. Stygar; J. E. Bailey; T. J. Nash; G. A. Rochau; D. B. Sinars

2010-04-21T23:59:59.000Z

426

Light-mass Bragg cavity polaritons in planar quantum dot lattices  

Science Journals Connector (OSTI)

The exciton-polariton modes of a quantum dot lattice embedded in a planar optical cavity are theoretically investigated. Umklapp terms, in which an exciton interacts with many cavity modes differing by reciprocal lattice vectors, appear in the Hamiltonian due to the periodicity of the dot lattice. We focus on Bragg polariton modes obtained by tuning the exciton and the cavity modes into resonance at high symmetry points of the Brillouin zone. Depending on the microcavity design, these polariton modes at finite in-plane momentum can be guided and can have long lifetimes. Moreover, their effective mass can be extremely small, of the order of 10?8m0 (m0 is the bare electron mass), and they constitute the lightest excitonlike quasiparticles in solids.

E. M. Kessler, M. Grochol, and C. Piermarocchi

2008-02-08T23:59:59.000Z

427

Note: Near infrared spectral and transient measurements of PbS quantum dots luminescence  

SciTech Connect (OSTI)

We describe an experimental setup for the characterization of luminescence from nanostructures. The setup is intended for steady-state and time-resolved luminescence measurements in the near-infrared region. The setup allows us to study spectral luminescence properties in the spectral range of 0.82.0 ?m with high spectral resolution and kinetic luminescence properties between 0.8 and 1.7 ?m with a time resolution of 3 ns. The capabilities of the system are illustrated by taking luminescence measurements from PbS quantum dots. We established the size dependencies of the optical properties of the PbS quantum dots over a wide spectral range. Finally, the energy transfer process was studied with a high temporal and spectral resolution.

Parfenov, P. S., E-mail: qrspeter@pochta.ru; Litvin, A. P., E-mail: litvin88@gmail.com; Ushakova, E. V.; Fedorov, A. V.; Baranov, A. V. [National Research University of Informational Technologies, Mechanics and Optics, 197101 49, Kronverkskiy pr., Saint Petersburg (Russian Federation)] [National Research University of Informational Technologies, Mechanics and Optics, 197101 49, Kronverkskiy pr., Saint Petersburg (Russian Federation); Berwick, K. [School of Electronic and Communications Engineering, Dublin Institute of Technology, Kevin Street, Dublin 8 (Ireland)] [School of Electronic and Communications Engineering, Dublin Institute of Technology, Kevin Street, Dublin 8 (Ireland)

2013-11-15T23:59:59.000Z

428

Effect of Organic and Inorganic Passivation in Quantum-Dot-Sensitized Solar Cells  

Science Journals Connector (OSTI)

This work was supported by the Institute of Nanotechnologies for Clean Energies (INCE), funded by the Generalitat Valenciana under Project ISIC/2012/008. ... We acknowledge projects CYTED-Nanoenerga, PAPIIT-IN106912 (UNAM-Mxico), and CONACyT-153270 (Mxico) for financial support. ... Quantum dot-sensitized solar cells (QDSSCs) are interesting energy devices because of their (i) impressive ability to harvest sunlight and generate multiple electron/hole pairs, (ii) ease of fabrication, and (iii) low cost. ...

Mauricio Solis de la Fuente; Rafael S. Snchez; Victoria Gonzlez-Pedro; Pablo P. Boix; S. G. Mhaisalkar; Marina E. Rincn; Juan Bisquert; Ivn Mora-Ser

2013-04-12T23:59:59.000Z

429

Local droplet etching Nanoholes, quantum dots, and air-gap heterostructures  

SciTech Connect (OSTI)

Local droplet etching (LDE) allows the self-organized generation of nanoholes in semiconductor surfaces and is fully compatible with molecular beam epitaxy (MBE). The influence of the process parameters as well as of droplet and substrate materials on the LDE nanohole morphology is discussed. Furthermore, recent applications of LDE, the fabrication of quantum dots by hole filling and the creation of air-gap heterostructures are addressed.

Heyn, Ch.; Sonnenberg, D.; Graf, A.; Kerbst, J.; Stemmann, A.; Hansen, W. [Institute of Applied Physics, University of Hamburg, Jungiusstr. 11, 20355 Hamburg (Germany)

2014-05-15T23:59:59.000Z

430

Second harmonic generation from direct band gap quantum dots pumped by femtosecond laser pulses  

SciTech Connect (OSTI)

We report on nonlinear optical experiments performed on Cu{sub 2}S quantum dots (QDs) pumped by femtosecond laser pulses. We conduct a theoretical simulation and experiments to determine their second harmonic generation characteristics. Furthermore, we demonstrate that the QDs have a second harmonic generation conversion efficiency of up to 76%. Our studies suggest that these Cu{sub 2}S QDs can be used for solar cells, bioimaging, biosensing, and electric detection.

Liu, Liwei, E-mail: liulw@cust.edu.cn; Wang, Yue; Hu, Siyi; Ren, Yu; Huang, Chen [School of Science, Changchun University of Science and Technology, Changchun, Jilin 130022, People's Republic of China and International Joint Research Center for Nanophotonics and Biophotonics, Changchun University of Science and Technology, Changchun, Jilin 130022 (China)

2014-02-21T23:59:59.000Z

431

* bulovic@mit.edu; phone 617 253 7012; fax 617 452 5110; rleweb.mit.edu/organic Method for fabrication of saturated RGB quantum dot light emitting  

E-Print Network [OSTI]

color emission in the red, green and blue regions of the spectrum. Keywords: nanocrystal, quantum dot capping groups, surrounding the QD lumophores, facilitate processing in organic solvents

432

Quantum dot based memory devices: Current status and future prospect by simulation perspective  

SciTech Connect (OSTI)

We discuss the simulation of floating gate MOSFET memory performance consists of Si/Ge/Si quantum dots for electronics storage nodes with higk-? material as the tunnel oxide. Heterostructure quantum dot was proposed to maintain the good memory performance without losing the long retention characteristic. As the results, retention time could be increase significantly without deteriorating the writing/erasing speed. By selected the dot size of 915nm and the tunnel oxide thickness of 2nm, the retention characteristic can reach up to 10{sup 9}s while the writing and erasing time at the order of 10{sup ?6}s. By replace the SiO{sub 2} tunnel oxide with high-? material such as HfO{sub 2}, ZrO{sub 2}, and Y{sub 2}O{sub 3} the leakage current due to the shrinkage of tunnel oxide thickness can be suppressed by the factor of 10 for the EOT lower than ?1nm. Moreover, the charge-trapping that generated by the defect at Si substrate and higk-? material interface are fully considered. We found that, the charge-trapping affects the retention time and memory operation performance. By increasing the charge-trapping depth and width, the memory operation time decrease significantly while the retention characteristic slightly improved.

Darma, Y., E-mail: yudi@fi.itb.ac.id; Rusydi, A., E-mail: yudi@fi.itb.ac.id [Department of Physics, Institut Teknologi Bandung, Ganesa 10 Bandung 40132, Indonesia and NUSNNI-NanoCore, Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542 and Singapore Synchrotron Light Source, National U (Singapore)

2014-02-24T23:59:59.000Z

433

Dynamic Acoustic Control of Individual Optically Active Quantum Dot-like Emission Centers in Heterostructure Nanowires  

E-Print Network [OSTI]

We probe and control the optical properties of emission centers forming in radial het- erostructure GaAs-Al0.3Ga0.7As nanowires and show that these emitters, located in Al0.3Ga0.7As layers, can exhibit quantum-dot like characteristics. We employ a radio frequency surface acoustic wave to dynamically control their emission energy and occupancy state on a nanosec- ond timescale. In the spectral oscillations we identify unambiguous signatures arising from both the mechanical and electrical component of the surface acoustic wave. In addition, differ- ent emission lines of a single quantum dot exhibit pronounced anti-correlated intensity oscilla- tions during the acoustic cycle. These arise from a dynamically triggered carrier extraction out of the quantum dot to a continuum in the radial heterostructure. Using finite element modeling and Wentzel-Kramers-Brillouin theory we identify quantum tunneling as the underlying mech- anism. These simulation results quantitatively reproduce the observed switching and show th...

Wei, Matthias; Schlein, Florian J R; Heigl, Michael; Rudolph, Daniel; Morktter, Stefanie; Dblinger, Markus; Bichler, Max; Abstreiter, Gerhard; Finley, Jonathan J; Koblmller, Gregor; Wixforth, Achim; Krenner, Hubert J

2014-01-01T23:59:59.000Z

434

The operation principle of the well in quantum dot stack infrared photodetector  

SciTech Connect (OSTI)

The well in the quantum dot stack infrared photodetector (WD-QDIP) is proposed which can be operated at high temperature ?230?K. The operation principle of this device is investigated, including the carrier transport and the enhancement in the photocurrent. The WD-QDIPs with different well numbers are fabricated to study the mechanisms. It is realized that the carrier transport from the emitter to the collector in traditional quantum dot infrared photodetectors consists of two channels deduced from current-voltage characteristics and dark current activation energy at different temperatures. At temperatures below 77?K, the current transports through the InAs quantum dot channel, whereas at temperatures higher than 77?K, the current is dominated by the GaAs leakage channel. In addition, the non-equilibrium situation at low temperatures is also observed owing to the presence of photovoltaic phenomenon. The carrier distribution inside the QDs is simulated to investigate the reasons for the increase of photocurrent. Based on the simulation and the photocurrent response, the hot carrier (electron) scattering effect by the insertion of a quantum well layer is inferred as the most probable reason that lead to the enhancement of the response and regarded as the key factor to achieve high- temperature operation.

Lee, Jheng-Han; Wu, Zong-Ming [Graduate Institute of Electronics Engineering, National Taiwan University, Taipei 10617, Taiwan (China); Liao, Yu-Min; Wu, Yuh-Renn [Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan (China); Lin, Shih-Yen [Graduate Institute of Electronics Engineering, National Taiwan University, Taipei 10617, Taiwan (China); Research Center for Applied Sciences, Academia Sinica, Taipei 115299, Taiwan (China); Lee, Si-Chen, E-mail: sclee@cc.ee.ntu.edu.tw [Graduate Institute of Electronics Engineering, National Taiwan University, Taipei 10617, Taiwan (China); Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan (China)

2013-12-28T23:59:59.000Z

435

Electron tunneling characteristics of a cubic quantum dot, (PbS){sub 32}  

SciTech Connect (OSTI)

The electron transport properties of the cubic quantum dot, (PbS){sub 32}, are investigated. The stability of the quantum dot has been established by recent scanning tunneling microscope experiments [B. Kiran, A. K. Kandalam, R. Rallabandi, P. Koirala, X. Li, X. Tang, Y. Wang, H. Fairbrother, G. Gantefoer, and K. Bowen, J. Chem. Phys. 136(2), 024317 (2012)]. In spite of the noticeable energy band gap (?2 eV), a relatively high tunneling current for (PbS){sub 32} is predicted affirming the observed bright images for (PbS){sub 32}. The calculated I-V characteristics of (PbS){sub 32} are predicted to be substrate-dependent; (PbS){sub 32} on the Au (001) exhibits the molecular diode-like behavior and the unusual negative differential resistance effect, though this is not the case with (PbS){sub 32} on the Au (110). Appearance of the conduction channels associated with the hybridized states of quantum dot and substrate together with their asymmetric distribution at the Fermi level seem to determine the tunneling characteristics of the system.

Gupta, Sanjeev K., E-mail: sanjeevg@mtu.edu, E-mail: haiying.he@valpo.edu; Banyai, Douglas; Pandey, Ravindra [Department of Physics, Michigan Technological University, Houghton, Michigan 49931 (United States)] [Department of Physics, Michigan Technological University, Houghton, Michigan 49931 (United States); He, Haiying, E-mail: sanjeevg@mtu.edu, E-mail: haiying.he@valpo.edu [Department of Physics and Astronomy, Valparaiso University, Valparaiso, Indiana 46383 (United States)] [Department of Physics and Astronomy, Valparaiso University, Valparaiso, Indiana 46383 (United States); Kandalam, Anil K. [Department of Physics, West Chester University of Pennsylvania, West Chester, Pennsylvania 19383 (United States)] [Department of Physics, West Chester University of Pennsylvania, West Chester, Pennsylvania 19383 (United States)

2013-12-28T23:59:59.000Z

436

Dot blot and PCR for Brettanomyces bruxellensis detection in red wine  

Science Journals Connector (OSTI)

Abstract The capability to identify in a short time Brettanomyces bruxellensis, the yeast causing wine spoilage, is an important result both to increase quality of the products and to reduce economic losses in wineries. The development of a quick and specific method to detect B. bruxellensis in wine samples is a good tool for routine controls in wineries. Specific primers (DekITS and BruxITR) and a specific digoxygenin labelled probe were designed to be used in a PCR protocol and in a Dot blot method to detect B.bruxellensis in wine samples and/or to confirm isolates from wine samples. A molecular method, not requiring colony growth, is helpful for winemakers alike to quickly obtain information about the presence of Brettanomyces in their products. The results of this work indicate that the dot blot method is sensitive and fits this goal showing a great potential for its simple applicability. Both methods PCR and dot blot were useful for both a direct detection and a species specific confirmation of the isolates.

Francesca Cecchini; Lucilla Iacumin; Marco Fontanot; Piergiorgio Comuzzo; Giuseppe Comi; Marisa Manzano

2013-01-01T23:59:59.000Z

437

Energy Loss of Neutrinos in 20 M{sub {center_dot}} and 40 M{sub {center_dot}} Massive Stars  

SciTech Connect (OSTI)

The progress from the theoretical and experimental aspects in neutrino physics shines light into neutrino physics as well as in astrophysics. It is known that when neutrinos pass through a medium, the neutrinos interact with electrons before emerging from the stars with an effective potential energy produced due to coherent forward scatterings that occurred in the medium. This potential engenders significant changes in the neutrino masses and their mixing in the medium. Thus electron neutrinos would oscillate into different mass eigenstate and this is dependent on the energy of the neutrinos. Some of the energy will be lost in the coherent scattering with the electrons by the charged current interaction. We have calculated the energy loss of the neutrinos by using a stopping power equation for both rotating and non-rotating 20 M{sub {center_dot}} and 40 M{sub {center_dot}} stars. The total energy loss of neutrinos depends on the electron density in the stars and on the survival probability of the electron neutrino. For high electron density profile and the survival probability, the energy loss will be significant.

Sofiah Ahmad, Nor; Yusof, Norhasliza; Abu Kassim, Hasan [Department of Physics, University of Malaya, 50603 Kuala Lumpur (Malaysia)

2011-03-30T23:59:59.000Z

438

Performance-oriented packaging: A guide to identifying and designing. Identifying and designing hazardous materials packaging for compliance with post HM-181 DOT Regulations  

SciTech Connect (OSTI)

With the initial publication of Docket HM-181 (hereafter referred to as HM-181), the U.S. Department of Energy (DOE), Headquarters, Transportation Management Division decided to produce guidance to help the DOE community transition to performance-oriented packagings (POP). As only a few individuals were familiar with the new requirements, elementary guidance was desirable. The decision was to prepare the guidance at a level easily understood by a novice to regulatory requirements. This document identifies design development strategies for use in obtaining performance-oriented packagings that are not readily available commercially. These design development strategies will be part of the methodologies for compliance with post HM-181 U.S. Department of Transportation (DOT) packaging regulations. This information was prepared for use by the DOE and its contractors. The document provides guidance for making decisions associated with designing performance-oriented packaging, and not for identifying specific material or fabrication design details. It does provide some specific design considerations. Having a copy of the regulations handy when reading this document is recommended to permit a fuller understanding of the requirements impacting the design effort. While this document is not written for the packaging specialist, it does contain guidance important to those not familiar with the new POP requirements.

Not Available

1994-08-01T23:59:59.000Z

439

Steps Toward a Successful Transition to  

E-Print Network [OSTI]

Steps Toward a Successful Transition to No-Till Sjoerd W. Duiker Soil Management Specialist, Penn .................................................................................. 3 Planning the transition to no ........................................................................ 12 Cover crop selection and management .............................................. 12 STEP 3

Kaye, Jason P.

440

Functions and Requirements for the Transition Project  

SciTech Connect (OSTI)

This document describes the functional requirement baseline for the Transition of 100 K Area Facilities Project (Transition Project). This baseline information consists of top-level functions, requirements, concept description, interface description, issues, and enabling assumptions.

YANOCHKO, R.M.

2000-04-24T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

Transition Metal Ions in the Gas Phase  

Science Journals Connector (OSTI)

For several years we have been studying the chemistry of atomic transition metal ions with simple organic molecules. This research was ... examining the consequences of oxidation and reduction of transition metal...

Douglas P. Ridge

1982-01-01T23:59:59.000Z

442

Site Transition Plan Guidance, December 2004  

SciTech Connect (OSTI)

A short Department of Energy program document has been created to provide an outline on what the Site Transition Plan (STP) objectives are for the transition from the Office of Environmental Management to the newly established Office of Legacy Management.

none,

2004-12-01T23:59:59.000Z

443

Fast flux test facility, transition project plan  

SciTech Connect (OSTI)

The FFTF Transition Project Plan, Revision 1, provides changes and project baseline for the deactivation activities necessary to transition the FFTF to a radiologically and industrially safe shutdown condition.

Guttenberg, S.

1994-11-15T23:59:59.000Z

444

Correlations in noisy Landau-Zener transitions  

E-Print Network [OSTI]

We analyze the influence of colored classical Gaussian noise on Landau-Zener transitions during a two-level crossing in a time-dependent regular external field. Transition probabilities and coherence factors become random due to the noise. We...

Pokrovsky, Valery L.; Scheidl, S.

2004-01-01T23:59:59.000Z

445

Vortex lines and transitions in superfluid hydrodynamics  

Science Journals Connector (OSTI)

...Preface to Vortices, dislocations, and line singularities in partial differential equations...Leslie and J. R. Ockendon. Vortex lines and transitions in superfluid hydrodynamics...nature and the motion of qunatized vortex lines. This paper illustrates the transitions...

1997-01-01T23:59:59.000Z

446

Progressive transitions using body part motion graphs  

Science Journals Connector (OSTI)

In this work we describe a preliminary method for progressive transitions in human locomotions. To achieve this, motion graphs have been used to synthesize body part transitions and every part has been synchronized with the other parts using time scaling. ...

Adso Fernndez-Baena; David Miralles

2011-12-01T23:59:59.000Z

447

Articulated transition duct in turbomachine  

SciTech Connect (OSTI)

Turbine systems are provided. A turbine system includes a transition duct comprising an inlet, an outlet, and a duct passage extending between the inlet and the outlet and defining a longitudinal axis, a radial axis, and a tangential axis. The outlet of the transition duct is offset from the inlet along the longitudinal axis and the tangential axis. The duct passage includes an upstream portion and a downstream portion. The upstream portion extends from the inlet between an inlet end and an aft end. The downstream portion extends from the outlet between an outlet end and a head end. The turbine system further includes a joint coupling the aft end of the upstream portion and the head end of the downstream portion together. The joint is configured to allow movement of the upstream portion and the downstream portion relative to each other about or along at least one axis.

Flanagan, James Scott; McMahan, Kevin Weston; LeBegue, Jeffrey Scott; Pentecost, Ronnie Ray

2014-04-29T23:59:59.000Z

448

Recommendation 198: Establish a site transition process  

Broader source: Energy.gov [DOE]

The ORSSAB recommends DOE Establish a Site Transition Process Upon Completion of Remediation at Ongoing Mission Sites.

449

KEYNOTE ADDRESS ECONOMIES IN TRANSITION: SOME ASPECTS  

E-Print Network [OSTI]

couple of days, with my focus on transition economies and environmental management in this neighborhoodKEYNOTE ADDRESS ECONOMIES IN TRANSITION: SOME ASPECTS OF ENVIRONMENTAL POLICY Jeffrey Sachs. Tel: (617) 495-5999. Fax: (617) 495-0527. #12;2 Keynote Address Economies in Transition: Some Aspects

450

Moving Ahead: From Transition to Transformation  

E-Print Network [OSTI]

political stability. This chapter briefly discusses the important elements of `management of transition' and components of `transformation' of the old state into a new nation. 9.2 Managing Transition It is crucially important to smoothly manage transition to achieve stability and democracy, and materialise transformation

Richner, Heinz

451

State and Transition Modeling History & Current Concepts  

E-Print Network [OSTI]

management input · Friedel(1991) concentrated on thresholds ­ "...compatible with state and transition theoryState and Transition Modeling History & Current Concepts Tamzen K. Stringham Oregon State vegetation change #12;· Non-equilibrium Models (States, Transitions and Thresholds) ­ Encompass Range

452

3, 50195060, 2003 The role of transition  

E-Print Network [OSTI]

in the atmospheric liquid phase related, in par- ticular, to the role of transition metal ions, to the presenceACPD 3, 5019­5060, 2003 The role of transition metal ions on HOx radicals in clouds L. Deguillaume and Physics Discussions The role of transition metal ions on HOx radicals in clouds: a numerical evaluation

Boyer, Edmond

453

Regional Transit System: Return on Investment Assessment  

E-Print Network [OSTI]

Regional Transit System: Return on Investment Assessment May 2014 #12;1 Today's agenda Itasca transit options Enables strategic, efficient investment in long-term infrastructure, e.g., energy grid are investing heavily in transit; these regions include Denver, Salt Lake City and Dallas, all rapidly growing

Minnesota, University of

454

SCATTERING BEHAVIOR OF TRANSITIONAL SHOCK WAVES  

E-Print Network [OSTI]

SCATTERING BEHAVIOR OF TRANSITIONAL SHOCK WAVES Kevin R. Zumbrun Bradley J. Plohr Dan Marchesin September, 1991 Abstract. We study the stability and asymptotic behavior of transitional shock waves as solutions of a parabolic system of conservation laws. In contrast to classical shock waves, transitional

New York at Stoney Brook, State University of

455

An Automobile/Transit Emissions Evaluation of Southern California's Metrolink  

E-Print Network [OSTI]

percentile) Finn| Report: An Automobile~Transit EmissionsAn Automobile/Transit Emissions Evaluation of Southernregulation. or An Automobile/Transit Emissions Evaluation of

Barth, Matthew J.; Tadi, Ramakrishna R.

1995-01-01T23:59:59.000Z

456

Review: The Transition Handbook: From Oil Dependency to Local Resilience  

E-Print Network [OSTI]

Review: The Transition Handbook: From Oil Dependency toRob. The Transition Handbook: From Oil Dependency to Localovercome in The Transition Handbook. His essential goal is

Alkhoury, Alex

2010-01-01T23:59:59.000Z

457

Self-assembling of Ge quantum dots in the CaF2/Ge/CaF2/Si heteroepitaxial system and the development of tunnel-resonance diode on its basis  

Science Journals Connector (OSTI)

A CaF2/Ge/CaF2/Si(111) heteroepitaxial structure with Ge quantum dots was grown by molecular-beam ... , is 4050 meV depending on the Ge dot size.

L. V. Sokolov; A. S. Deryabin; A. I. Yakimov

2004-01-01T23:59:59.000Z

458

", Mat. Res. Soc. Symp. Proc., vol. 974E, pp0974-CC06-01 ff. Exciton Lifetime in PbS Quantum Dots in Glass  

E-Print Network [OSTI]

energy conversion efficiency of ~32% for a band gap of ~1.5 eV. The discovery of efficient multiexciton quantum dot state that is optically forbidden [8]. If a dark exciton state lies at lower energy than generation by high energy photons in quantum dots [2, 3] may lead to significant improvements in efficiency

Persans, Peter D.

459

Single Quantum Dot Tracking Reveals that an Individual Multivalent HIV-1 Tat Protein Transduction Domain Can Activate Machinery for Lateral Transport and Endocytosis  

Science Journals Connector (OSTI)

...microtubule-guided motors or diffusion. Two-color...the cortical network. Future studies are needed to...cells utilizing single-quantum dot tracking (SQT...transport of HER2 by motor proteins in living cells...proteins labeled with quantum dots. Exp. Cell Res...

Yasuhiro Suzuki; Chandra Nath Roy; Warunya Promjunyakul; Hiroyasu Hatakeyama; Kohsuke Gonda; Junji Imamura; Biju Vasudevanpillai; Noriaki Ohuchi; Makoto Kanzaki; Hideo Higuchi; Mitsuo Kaku

2013-06-03T23:59:59.000Z

460

Influence of Cationic Precursors on CdS Quantum-Dot-Sensitized Solar Cell Prepared by Successive Ionic Layer Adsorption and  

E-Print Network [OSTI]

solar cells has grown significantly, and the technology has been considered as one of the most costInfluence of Cationic Precursors on CdS Quantum-Dot-Sensitized Solar Cell Prepared by Successive (QDs) onto porous oxide films for quantum-dot-sensitized solar cell (QDSC) applications. In this work

Cao, Guozhong

Note: This page contains sample records for the topic "gray dots transitioning" 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

In-Transit Natural Gas Form | Department of Energy  

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

In-Transit Natural Gas Form In-Transit Natural Gas Form Excel Version of In-Transit Natural Gas Form.xlsx PDF Version of In-Transit Natural Gas Form More Documents & Publications...

462

wong-99.PDF  

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

March 22-26, 1999 2 Figure 1. TOA ERBE albedo for January 4, 1986, as a function of solar zenith angle (gray dots). The black dots in the left panel show the sensitivity of...

463

Approximating Metal-Insulator Transitions  

E-Print Network [OSTI]

We consider quantum wave propagation in one-dimensional quasiperiodic lattices. We propose an iterative construction of quasiperiodic potentials from sequences of potentials with increasing spatial period. At each finite iteration step the eigenstates reflect the properties of the limiting quasiperiodic potential properties up to a controlled maximum system size. We then observe approximate metal-insulator transitions (MIT) at the finite iteration steps. We also report evidence on mobility edges which are at variance to the celebrated Aubry-Andre model. The dynamics near the MIT shows a critical slowing down of the ballistic group velocity in the metallic phase similar to the divergence of the localization length in the insulating phase.

C. Danieli; K. Rayanov; B. Pavlov; G. Martin; S. Flach

2014-05-06T23:59:59.000Z

464

Glass Transition in Confined Geometry  

E-Print Network [OSTI]

Extending mode-coupling theory, we elaborate a microscopic theory for the glass transition of liquids confined between two parallel flat hard walls. The theory contains the standard MCT equations in bulk and in two dimensions as limiting cases and requires as input solely the equilibrium density profile and the structure factors of the fluid in confinement. We evaluate the phase diagram as a function of the distance of the plates for the case of a hard sphere fluid and obtain an oscillatory behavior of the glass transtion line as a result of the structural changes related to layering.

Simon Lang; Vitalie Botan; Martin Oettel; David Hajnal; Thomas Franosch; Rolf Schilling

2010-08-23T23:59:59.000Z

465

An electrically driven quantum dot-in-nanowire visible single photon source operating up to 150 K  

SciTech Connect (OSTI)

We demonstrate electrically pumped single photon emission up to 150 K from a single InGaN quantum dot embedded in a GaN nanowire junction diode. The InGaN dot-in-nanowire p-n junctions were grown on silicon by molecular beam epitaxy. The exciton electroluminescence from individual dot-in-nanowires is in the green spectral range (? ? 520 nm) and is detectable up to 150 K. Second order autocorrelation measurements performed at the exciton energy at an ambient temperature of 125 K show a background corrected g{sup (2)}(0) equal to 0.35, indicating dominant single photon emission. The steady state nanowire temperature under these conditions is estimated to be 150 K due to Joule heating induced by the large nanowire series resistance. Time resolved photoluminescence measurements yield an exciton radiative lifetime of 1.1 ns.

Deshpande, Saniya; Bhattacharya, Pallab [Center for Photonics and Multiscale Nanomaterials, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109-2122 (United States)] [Center for Photonics and Multiscale Nanomaterials, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109-2122 (United States)

2013-12-09T23:59:59.000Z

466

Magnetotransport theory in quantum dots: 3D-0D and 2D-0D tunneling and angular momentum selection rules  

Science Journals Connector (OSTI)

A study of magnetotransport through quantum dots is presented. The model allows one to analyze tunneling both from bulk-like contacts and from 2D accumulation layers. The fine features in the I-V characteristics due to the quantum dot states are known to be shifted to different voltages depending upon the value of the magnetic field. While this effect is also well reproduced by our calculations, in this work we concentrate on the amplitude of each current resonance as a function of the magnetic field. Such amplitudes show oscillations reflecting the variation of the density of states at the Fermi energy in the emitter. Furthermore the amplitude increases as a function of the magnetic field for certain features while it decreases for others. In particular, we demonstrate that the behavior of the amplitude of the current resonances is linked to the value of the angular momentum of each dot level through which tunneling occurs. We show that a selection rule on the angular momentum must be satisfied. As a consequence, tunneling through specific dot states is strongly suppressed and sometimes prohibited altogether by the presence of the magnetic field. This will allow to extract from the experimental curves detailed information on the nature of the quantum-dot wave functions involved in the electronic transport. Furthermore, when tunneling occurs from a two-dimensional accumulation layer to the quantum dot, the presence of a magnetic field hugely increases the strength of some resonant features. This effect is predicted by our model and, to the best of our knowledge, has never been observed.

B. Jouault; M. Boero; G. Faini; J. C. Inkson

1999-02-15T23:59:59.000Z

467

Optimization towards high density quantum dots for intermediate band solar cells grown by molecular beam epitaxy  

SciTech Connect (OSTI)

We report high density quantum dots (QDs) formation with optimized growth temperature and V/III ratio. At lower growth temperature, QD density is increased, due to smaller surface migration length of In adatoms. With higher V/III, the QD density is higher but it results in large clusters formation and decreases the QD uniformity. The QD solar cell was fabricated and examined. An extended spectral response in contrast to the GaAs reference cell was presented but the external quantum efficiency at energies higher than GaAs band gap is reduced, resulting from the degradation for the emitter above the strained QD layers.

Zhou, D.; Sharma, G.; Fimland, B. O. [Department of Electronics and Telecommunications, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim (Norway); Thomassen, S. F.; Reenaas, T. W. [Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim (Norway)

2010-02-08T23:59:59.000Z

468

Covalent Monofunctionalization of Peptide-Coated Quantum Dots for Single-Molecule Assays  

Science Journals Connector (OSTI)

Since many of the pQD-mSAV1 (? 80%) did not bind to any biotin molecules, a future improvement could be the site-specific conjugation of mSAV, to ensure that its single biotin-binding site is oriented away from the QD surface, with increased accessibility. ... When attached to a substrate surface, these motors are envisioned to shuttle cargo that is bound to reconstituted microtubules-one component of the cell cytoskeleton-from one location to another. ... A combination of quantum dots and fluorescence-interference contrast microscopy can be used to monitor the rotation of microtubules with nanometer accuracy as they glide over motor proteins. ...

Samuel Clarke; Fabien Pinaud; Oliver Beutel; Changjiang You; Jacob Piehler; Maxime Dahan

2010-04-30T23:59:59.000Z

469

Peptide-Conjugated Quantum Dots Activate Neuronal Receptors and Initiate Downstream Signaling of Neurite Growth  

Science Journals Connector (OSTI)

Peptide-Conjugated Quantum Dots Activate Neuronal Receptors and Initiate Downstream Signaling of Neurite Growth ... As a focus of this work, we have chosen to study NGF, a peptide hormone that targets motor, sensory, and autonomic neurons and is critical for neuronal survival, development, and maintenance. ... Future work aimed at modulating cell differentiation by varying parameters such as the concentration, spacer length, and size of the ligand-conjugated QD will be useful for evaluating and optimizing the sensitivity of these nanostructures and their effects on cell function. ...

Tania Q. Vu; Ravikanth Maddipati; Todd A. Blute; Barrett J. Nehilla; Leora Nusblat; Tejal A. Desai

2005-03-24T23:59:59.000Z

470

Effect of internal electric field on InAs/GaAs quantum dot solar cells  

SciTech Connect (OSTI)

We studied time-resolved carrier recombination in InAs/GaAs quantum dot (QD) solar cells. The electric field in a p-i-n diode structure spatially separates photoexcited carriers in QDs, strongly affecting the conversion efficiency of intermediate-band solar cells. The radiative decay lifetime is dramatically reduced in a strong electric field (193?kV/cm) by efficient recombination due to strong carrier localization in each QD and significant tunneling-assisted electron escape. Conversely, an electric field of the order of 10?kV/cm maintains electronic coupling in the stacked QDs and diminishes tunneling-assisted electron escape.

Kasamatsu, Naofumi; Kada, Tomoyuki; Hasegawa, Aiko; Harada, Yukihiro; Kita, Takashi [Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501 (Japan)

2014-02-28T23:59:59.000Z

471

Direct Patterning of CdSe Quantum Dots into Sub-100 nm Structures  

SciTech Connect (OSTI)

Ordered, two-dimensional cadmium selenide (CdSe) arrays have been fabricated on indium-doped tin oxide (ITO) electrodes using the pattern replication in nonwetting templates (PRINT) process. CdSe quantum dots (QDs) with an average diameter of 2.7 nm and a pyridine surface ligand were used for patterning. The PRINT technique utilizes a perfluoropolyether (PFPE) elastomeric mold that is tolerant of most organic solvents, thus allowing solutions of CdSe QDs in 4-picoline to be used for patterning without significant deformation of the mold. Nanometer-scale diffraction gratings have been successfully replicated with CdSe QDs.

Hampton, Meredith J.; Templeton, Joseph L.; DeSimone, Joseph M.

2010-01-01T23:59:59.000Z

472

SiGe quantum dots for fast hole spin Rabi oscillations  

SciTech Connect (OSTI)

We report on hole g-factor measurements in three terminal SiGe self-assembled quantum dot devices with a top gate electrode positioned very close to the nanostructure. Measurements of both the perpendicular as well as the parallel g-factor reveal significant changes for a small modulation of the top gate voltage. From the observed modulations, we estimate that, for realistic experimental conditions, hole spins can be electrically manipulated with Rabi frequencies in the order of 100?MHz. This work emphasises the potential of hole-based nano-devices for efficient spin manipulation by means of the g-tensor modulation technique.

Ares, N.; Prager, A.; De Franceschi, S. [SPSMS/LaTEQS, CEA-INAC/UJF-Grenoble 1, 17 Rue des Martyrs, 38054 Grenoble Cedex 9 (France)] [SPSMS/LaTEQS, CEA-INAC/UJF-Grenoble 1, 17 Rue des Martyrs, 38054 Grenoble Cedex 9 (France); Katsaros, G. [SPSMS/LaTEQS, CEA-INAC/UJF-Grenoble 1, 17 Rue des Martyrs, 38054 Grenoble Cedex 9 (France) [SPSMS/LaTEQS, CEA-INAC/UJF-Grenoble 1, 17 Rue des Martyrs, 38054 Grenoble Cedex 9 (France); Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany); Johannes Kepler University, Institute of Semiconductor and Solid State Physics, Altenbergerstr. 69, 4040 Linz (Austria); Golovach, V. N. [Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany) [Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany); Centro de Fsica de Materiales CFM/MPC (CSIC-UPV/EHU) and Donostia International Physics Center DIPC, E-20018 San Sebastin (Spain); IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao (Spain); Zhang, J. J. [Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany)] [Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany); Glazman, L. I. [Department of Physics, Yale University, New Haven, Connecticut 06520 (United States)] [Department of Physics, Yale University, New Haven, Connecticut 06520 (United States); Schmidt, O. G. [Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany) [Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany); Center for Advancing Electronics Dresden, TU Dresden (Germany)

2013-12-23T23:59:59.000Z

473

GaAs single quantum dot embedded into AlGaAs nanowire  

SciTech Connect (OSTI)

We report on a study of the photoluminescence spectra taken from quasi one-dimensional and quasi zero-dimensional semiconductor heterostructures. The structures were grown by molecular-beam epitaxy in (111) direction and were cylindrical nanowires based on AlGaAs, of 20 - 50 nm in diameter and 0.5 - 1 ?m in length. Inside the nanowires contain one or two GaAs quantum dots, of 2 nm thick and 15 - 45 nm in diameter. We studied a single nanowire. The photoluminescence and photoluminescence excitation spectra were registered as a function of the intensity of optical excitation.

Kochereshko, V. P.; Kats, V. N. [A.F.Ioffe Physical-Technical Institute, Politekhnicheskaya 26, 194021, St. Petersburg, Russia and Spin Optics Laboratory, Saint Petersburg State University, Ul'yanovskaya 1, Petrodvorets, St. Petersburg, 198904 (Russian Federation); Platonov, A. V. [A.F.Ioffe Physical-Technical Institute, Politekhnicheskaya 26, 194021, St. Petersburg (Russian Federation); Cirlin, G. E.; Bouravleuv, A. D.; Samsonenko, Yu. B. [A.F.Ioffe Physical-Technical Institute, Politekhnicheskaya 26, 194021, St. Petersburg, Russia and St. Petersburg Academic University of the RAS Khlopina 8/3, 195220, St. Petersburg (Russian Federation); Besombes, L.; Mariette, H. [CEA-CNRS group Nanophysique et Semiconducteurs, CEA, INAC, SP2M, and Institut Nel, 17 rue des Martyrs, F-38054 Grenoble (France)

2013-12-04T23:59:59.000Z

474

Observation of photo darkening in self assembled InGaAs/GaAs quantum dots  

SciTech Connect (OSTI)

Photo darkening was observed in epitaxial InGaAs/GaAs quantum dots (QDs). The photoluminescence (PL) intensity of the QDs showed a non-reversible decrease under continuous laser irradiation. The time constants varied from tens of minutes to several hours, depending on the applied laser power. Based on the spectral evolution, it was concluded that the observed phenomenon should originate from laser induced structural damage and a sustained increase of non-radiative recombination rate in the wetting layer. Additionally, according to the PL decay dynamics at different laser powers, it is argued that there should exist other processes that hinder PL degradation at a high laser power.

Zhang Hongyi; Chen Yonghai; Zhou Xiaolong; Jia Yanan; Ye Xiaoling; Xu Bo; Wang Zhanguo [Key Laboratory of Semiconductor Materials Science and Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083 (China)

2013-05-07T23:59:59.000Z

475

Mid infrared optical properties of Ge/Si quantum dots with different doping level  

SciTech Connect (OSTI)

Optical characterization of the Ge/Si quantum dots using equilibrium and photo-induced absorption spectroscopy in the mid-infrared spectral range was performed in this work. Equilibrium absorption spectra were measured in structures with various doping levels for different light polarizations. Photo-induced absorption spectra measured in undoped structure under interband optical excitation of non-equilibrium charge carriers demonstrate the same features as doped sample in equilibrium conditions. Hole energy spectrum was determined from the analysis of experimental data.

Sofronov, A. N.; Firsov, D. A.; Vorobjev, L. E.; Shalygin, V. A.; Panevin, V. Yu.; Vinnichenko, M. Ya. [St. Petersburg State Polytechnic University, Polytechnicheskaya str. 29, St. Petersburg (Russian Federation); Tonkikh, A. A. [Max Planck Institute of Microstructure Physics, Weinberg 2 D-06120, Halle (Saale) (Germany); Danilov, S. N. [University of Regensburg, Regensburg (Germany)

2013-12-04T23:59:59.000Z

476

Efficiency, power, and period at two optimum operations of a thermoelectric single-level quantum dot  

Science Journals Connector (OSTI)

We take a single-level quantum dot embedded between two metallic leads at different temperatures and chemical potentials which works as a heat engine. Two optimization criteria were used and their corresponding optimized efficiencies, powers, and periods evaluated. A comparison between similar quantities of the two optimization criteria reveals mixed advantages and disadvantages. We quantify the engine's overall performance by suggesting a figure of merit that takes into account the contribution of each of the three quantities. Based on the proposed figure of merit, one of the optimization criterion presents a clear advantage. This same criterion is found to be invariably advantageous when applied to three other representative models.

Fitsum Borga; Mulugeta Bekele; Yergou B. Tatek; Mesfin Tsige

2012-09-26T23:59:59.000Z

477

Secondary treatment of films of colloidal quantum dots for optoelectronics and devices produced thereby  

DOE Patents [OSTI]

A method of forming an optoelectronic device. The method includes providing a deposition surface and contacting the deposition surface with a ligand exchange chemical and contacting the deposition surface with a quantum dot (QD) colloid. This initial process is repeated over one or more cycles to form an initial QD film on the deposition surface. The method further includes subsequently contacting the QD film with a secondary treatment chemical and optionally contacting the surface with additional QDs to form an enhanced QD layer exhibiting multiple exciton generation (MEG) upon absorption of high energy photons by the QD active layer. Devices having an enhanced QD active layer as described above are also disclosed.

Semonin, Octavi Escala; Luther, Joseph M; Beard, Matthew C; Chen, Hsiang-Yu

2014-04-01T23:59:59.000Z

478

Quantum Dotting the i of Inquiry: A Guided Inquiry Approach to Teaching Nanotechnology  

Science Journals Connector (OSTI)

When illuminating four mystery vials of nanoparticle solution with a 405?nm light emitting diode(LED) four distinct colors related to the peak wavelength of fluorescent emission can be observed.1 This phenomenon perplexes high schoolphysics students and leads to the subsequent exploratory question Why are the four vials emitting a different color light if they all contain the same material and are illuminated with the same light source? That question gives students the opportunity to collect and analyze data which leads to the development of the inherent scientific concept that the color of the emitted light depends on the size of the material(quantum dot) suspended in solution.

Timothy A. Laubach; Lee A. Elizondo; Patrick J. McCann; Shahryar Gilani

2010-01-01T23:59:59.000Z

479

Size-Controllable and Low-Cost Fabrication of Graphene Quantum Dots Using Thermal Plasma Jet  

Science Journals Connector (OSTI)

graphene quantum dots; thermal plasma jet; mass production; size-controllable fabrication; low-cost fabrication; carbyne-like edges; photoluminescence ... We produced carbon soot by injecting ethylene gas continuously (at a rate of 2.5 L/min) into Ar plasma and attaching a carbon tube (5, 10, or 20 cm in length) to the anode. ... (34) In principle, oxygen is not contained in our fabrication, since only Ar and ethylene gases have been added into a plasma system as the plasma gas and carbon source, respectively. ...

Juhan Kim; Jung Sang Suh

2014-03-30T23:59:59.000Z

480

High excitation power photoluminescence studies of ultra-low density GaAs quantum dots  

SciTech Connect (OSTI)

We fabricate GaAs epitaxial quantum dots (QDs) by filling of self-organized nanoholes in AlGaAs. The QDs are fabricated under optimized process conditions and have ultra-low density in the 10{sup 6} cm{sup ?2} regime. At low excitation power the optical emission of single QDs exhibit sharp excitonic lines, which are attributed to the recombination of excitonic and biexcitonic states. High excitation power measurements reveal surprisingly broad emission lines from at least six QD shell states.

Sonnenberg, D.; Graf, A.; Paulava, V.; Heyn, Ch.; Hansen, W. [Institut fr Angewandte Physik und Zentrum fr Mikrostrukturforschung, Universitt Hamburg, Jungiusstr. 11, 20355 Hamburg (Germany)

2013-12-04T23:59:59.000Z

Note: This page contains sample records for the topic "gray dots transitioning" 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

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

482

Self-frequency summing in quantum dot photonic crystal nanocavity lasers  

SciTech Connect (OSTI)

We demonstrate self-frequency summing in photonic crystal nanocavity lasers with quantum dot gain. Two dipole modes and a hexapole mode, supported in the cavity, simultaneously showed lasing oscillation in the near infrared wavelength region under optical carrier injection. Meanwhile, within the same laser cavity, the internally generated three laser fields are up-converted to exhibit sharp visible emission lines via intra-cavity nonlinear frequency summing (and doubling) processes. This self-frequency summing process in active nanocavities will pave the way for developing nanoscale nonlinear optical light sources.

Ota, Yasutomo; Watanabe, Katsuyuki [Institute for Nano Quantum Information Electronics, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan)] [Institute for Nano Quantum Information Electronics, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan); Iwamoto, Satoshi; Arakawa, Yasuhiko [Institute for Nano Quantum Information Electronics, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan) [Institute for Nano Quantum Information Electronics, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan); Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 (Japan)

2013-12-09T23:59:59.000Z

483

Liquid-phase plasma synthesis of silicon quantum dots embedded in carbon matrix for lithium battery anodes  

SciTech Connect (OSTI)

Graphical abstract: - Highlights: Silicon quantum dots embedded in carbon matrix (SiQDs/C) were fabricated. SiQDs/C exhibits excellent battery performance as anode materials with high specific capacity. The good performance was attributed to the marriage of small sized SiQDs and carbon. - Abstract: Silicon quantum dots embedded in carbon matrix (SiQDs/C) nanocomposites were prepared by a novel liquid-phase plasma assisted synthetic process. The SiQDs/C nanocomposites were demonstrated to show high specific capacity, good cycling life and high coulmbic efficiency as anode materials for lithium-ion battery.

Wei, Ying [Institute of Functional Nano and Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou (China); College of Chemistry and Chemical Engineering, Bohai University, Jinzhou 121000 (China); Yu, Hang; Li, Haitao; Ming, Hai; Pan, Keming; Huang, Hui [Institute of Functional Nano and Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou (China); Liu, Yang, E-mail: yangl@suda.edu.cn [Institute of Functional Nano and Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou (China); Kang, Zhenhui, E-mail: zhkang@suda.edu.cn [Institute of Functional Nano and Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou (China)

2013-10-15T23:59:59.000Z

484

Towards Quantum Repeaters with Solid-State Qubits: Spin-Photon Entanglement Generation using Self-Assembled Quantum Dots  

E-Print Network [OSTI]

In this chapter we review the use of spins in optically-active InAs quantum dots as the key physical building block for constructing a quantum repeater, with a particular focus on recent results demonstrating entanglement between a quantum memory (electron spin qubit) and a flying qubit (polarization- or frequency-encoded photonic qubit). This is a first step towards demonstrating entanglement between distant quantum memories (realized with quantum dots), which in turn is a milestone in the roadmap for building a functional quantum repeater. We also place this experimental work in context by providing an overview of quantum repeaters, their potential uses, and the challenges in implementing them.

McMahon, Peter L

2015-01-01T23:59:59.000Z

485

Energy Transition Model | Open Energy Information  

Open Energy Info (EERE)

Energy Transition Model Energy Transition Model Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Energy Transition Model Agency/Company /Organization: Quintel Intelligence Sector: Energy Topics: Resource assessment Resource Type: Maps, Software/modeling tools User Interface: Website Website: energytransitionmodel.com/ Country: Netherlands Web Application Link: energytransitionmodel.com/ Cost: Free OpenEI Keyword(s): International UN Region: Western Europe References: webservice-energy.org[1] MINES Energy Transition Model[2] Logo: Energy Transition Model The Energy Transition Model is an independent, comprehensive and fact-based energy model that is used by governments, corporations, NGOs and educators in various countries. It is backed by more than 20 partners. There are

486

Wetland Hydrology Matthew J. Gray  

E-Print Network [OSTI]

and designed to fit into the French ATR-42. It comprises22 three similar commercial analysers: CLD780TR (ECO-PHYSICS at a flow rate of25 9L.min-1 (3L.min-1 for each analyser). The flow rate of each analyser is controlled analyser.28 Finally, purified air (air pumped passing through three cartridges containing drierite

Gray, Matthew

487

THE GRAY HERBARIUM CARD INDEX  

Science Journals Connector (OSTI)

...cards of the then cur-rent; library size, namely...No. 1836 works the assistance of Miss Mary A. Day...Angeles; Uni-versity of Minnesota; University of Wisconsin...appreciation of the volunteer assistance which has-from time...much time and at some financial loss, it seems justified...

B. L. Robinson; Lesley C. Wilcox

1930-03-07T23:59:59.000Z

488

Subcritical Fluctuations at the Electroweak Phase Transition  

E-Print Network [OSTI]

We study the importance of thermal fluctuations during the electroweak phase transition. We evaluate in detail the equilibrium number density of large amplitude subcritical fluctuations and discuss the importance of phase mixing to the dynamics of the phase transition. Our results show that, for realistic Higgs masses, the phase transition can be completed by the percolation of the true vacuum, induced by the presence of subcritical fluctuations.

Rudnei O. Ramos

1996-07-24T23:59:59.000Z

489

Transitions between patterns in thermal convection  

SciTech Connect (OSTI)

We present experimental studies of the transitions between conduction, hexagons, and rolls in non-Boussinesq convection of gaseous CO{sub 2} in a cylindrical cell of radius-to-height ratio 86. Except for the transition from conduction to hexagons, transitions occur when the two states involved have nearly the same value of a generalized potential rather than at the stability limits. Conduction gives way to hexagons via the propagation of a front connecting the two states, while the transitions between hexagons and rolls are facilitated at the cell walls which appear to nucleate the minority state.

Bodenschatz, E.; de Bruyn, J.R.; Ahlers, G.; Cannell, D.S. (Department of Physics and Center for Nonlinear Science, University of California, Santa Barbara, Santa Barbara, California (USA) Memorial University of Newfoundland, St. John's, Newfoundland (Canada))

1991-11-25T23:59:59.000Z

490

Contract Transition Process Letter, August 2008  

Office of Environmental Management (EM)

However, an assuming contractor may retain interim VPP status for up to a 24-month transition period if they (1) establish new written commitments by both management and...

491

Dynamics of stimulated L ? H transitions  

SciTech Connect (OSTI)

We report on model studies of stimulated L ? H transitions [K. Miki et al., Phys. Rev. Lett. 110, 195002 (2013)]. These studies use a reduced mesoscale model. Model studies reveal that L ? H transition can be triggered by particle injection into a subcritical state (i.e., Ptransition. For low ambient heating, strong injection is predicted to trigger a transient turbulence collapse. Repetitive injection at a period less than the lifetime of the collapsed state can thus maintain the turbulence collapse and so sustain a driven H-mode-like state. The total number of particles required to induce a transition by either injection or gas puffing is estimated. Results indicate that the total number of injected particles required is much smaller than that required for a transition by gas puffing. We thus show that internal injection is more efficient than gas puffing of comparable strength. We also observe that zonal flows do not play a critical role in stimulated transitions. For spontaneous transitions, the spike of the Reynolds work of turbulence on the zonal flow precedes the spike in the mean electric field shear. In contrast, we show that the two are coincident for stimulated transitions, suggesting that there is no causal link between zonal and mean flows for stimulated transitions.

Miki, K. [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of) [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); Center for Computational Science and e-Systems, Japan Atomic Energy Agency, Chiba 277-8587 (Japan); Diamond, P. H.; Xiao, W. W. [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of) [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); Center for Momentum Transport and Flow Organization, University of California, San Diego, California 92093 (United States); Hahn, S.-H. [KSTAR Team, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of)] [KSTAR Team, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); Grcan, . D. [LPP, Ecole Polytechnique, CNRS, 92118 Palaiseau Cedex (France)] [LPP, Ecole Polytechnique, CNRS, 92118 Palaiseau Cedex (France); Tynan, G. R. [Center for Momentum Transport and Flow Organization, University of California, San Diego, California 92093 (United States)] [Center for Momentum Transport and Flow Organization, University of California, San Diego, California 92093 (United States)

2013-08-15T23:59:59.000Z

492

NNSA, Djibouti Transition Radiation Detection System | National...  

National Nuclear Security Administration (NNSA)

Related News DOENNSA Participates in Large-Scale CTBT On-Site Inspection Exercise in Jordan Charles E. Messick receives the Administrator's Gold Award NNSA, Argentina Transition...

493

Transitioning the Transportation Sector: Exploring the Intersection...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

the Transportation Sector: Exploring the Intersection of Hydrogen Fuel Cell and Natural Gas Vehicles Transitioning the Transportation Sector: Exploring the Intersection...

494

Site Transition Guidance | Department of Energy  

Office of Environmental Management (EM)

Transition Guidance More Documents & Publications EM Recovery Act Lessons Learned (Johnson) Info-Exch 2012 - Thomas Johnson Presentation EM Recovery Act Lessons Learned...

495

DOE Hydrogen Transition Analysis Workshop Discussion Comments...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Workshop Discussion Comments, Questions, and Action Items DOE Hydrogen Transition Analysis Workshop Discussion Comments, Questions, and Action Items Discussion comments, questions,...

496

Energy Transition Initiative: Islands Playbook (Book) | OSTI...  

Office of Scientific and Technical Information (OSTI)

Energy Transition Initiative: Islands Playbook (Book) Re-direct Destination: Temp Data Fields Not Available Temp Data Storage 3: National Renewable Energy Laboratory (NREL),...

497

Biphasic quantum dots of cubic and hexagonal Mn doped CdS; necessity of Rietveld analysis  

Science Journals Connector (OSTI)

Abstract Mn2+ doped CdS quantum dots (QDs) were prepared via a simple chemical synthesis method. Incorporation of Mn ions into CdS \\{QDs\\} was monitored by structural, magnetic and optical spectroscopy analysis. Although the diffraction patterns seemed to be single wurtzite hexagonal structure, analysis revealed biphasic composite of CdS \\{QDs\\} hexagonal wurtzite and cubic zinc blende. The band gap, crystal phase and the morphology of CdS \\{QDs\\} were found not to be greatly affected by Mn2+ doping, however there was an optimal Mn2+ doping content of 10% where the magnetism is maximum. The recorded photoluminescence (PL) emission spectra, excited at 370nm, depict emission lines in the UV and blue-shift regions. The emission band reveals that the band gap of pure CdS \\{QDs\\} is around 3eV which is greater than that of bulk CdS (2.42eV). The band gap of Mn:CdS \\{QDs\\} is almost independent of Mn content (x) and the crystallite size remains almost the same for all values of x. The observed structural, magnetic and optical properties have been explained on the basis of formation of two phases of CdS doped with Mn. This work aims to highlight recent advances in the synthesis of Mn:CdS diluted magnetic semiconductor quantum dots and their wonderful performance.

Zein K. Heiba; Mohamed Bakr Mohamed; N.G. Imam

2015-01-01T23:59:59.000Z

498

Photoinduced Surface Oxidation and Its Effect on the Exciton Dynamics of CdSe Quantum Dots  

SciTech Connect (OSTI)

With increased interest in semiconductor nanoparticles for use in quantum dot solar cells there comes a need to understand the long-term photostability of such materials. Colloidal CdSe quantum dots (QDs) were suspended in toluene and stored in combinations of light/dark and N{sub 2}/O{sub 2} to simulate four possible benchtop storage environments. CdSe QDs stored in a dark, oxygen-free environment were observed to better retain their optical properties over the course of 90 days. The excited state lifetimes, determined through femtosecond transient absorption spectroscopy, of air-equilibrated samples exposed to light exhibit a decrease in average lifetime (0.81 ns) when compared to samples stored in a nitrogen/dark environment (8.3 ns). A photoetching technique commonly used for controlled reduction of QD size was found to induce energetic trap states to CdSe QDs and accelerate the rate of electron-hole recombination. X-ray absorption near edge structure (XANES) analysis confirms surface oxidation, the extent of which is shown to be dependent on the thickness of the ligand shell.

Hines, Douglas A.; Becker, Matthew A.; Kamat, Prashant V. (Notre)

2012-11-14T23:59:59.000Z

499

TEST & EVALUATION REPORT FOR THE HEDGEHOG-II PACKAGING SYSTEMS DOT-7A TYPE A CONTAINER  

SciTech Connect (OSTI)

This report documents the US. Department of Transportation Specification 7A (DOT-7A) Type A compliance test and evaluation results for the Hedgehog-II packaging systems. The approved Hedgehog-II packaging configurations provide primary and secondary containment. The approved packaging configurations described within this report are designed to ship Type A quantities of radioactive materials, normal form. Contents may be in solid or liquid form. Liquids transported in the approved 1 L glass bottle assembly shall have a specific gravity of less than or equal to 1.6. Liquids transported in all other approved configurations shall have a specific gravity of less than or equal to 2.0. The solid contents, including packaging, are limited in weight to the gross weight of the as-tested liquids and bottles. The approved Hedgehog-II packaging configurations described in this report may be transported by air, and have been evaluated as meeting the applicable International Air Transport Association/International Civil Aviation Organization (IATA/ICAO) Dangerous Goods Regulations in addition to the DOT requirements.

KELLY, D.L.

2003-12-29T23:59:59.000Z

500

Theory of Linear Optical Absorption in Diamond Shaped Graphene Quantum Dots  

E-Print Network [OSTI]

In this paper, optical and electronic properties of diamond shaped graphene quantum dots (DQDs) have been studied by employing large-scale electron-correlated calculations. The computations have been performed using the $\\pi$-electron Pariser-Parr-Pople model Hamiltonian, which incorporates long-range Coulomb interactions. The influence of electron-correlation effects on the ground and excited states has been included by means of the configuration-interaction approach, used at various levels. Our calculations have revealed that the absorption spectra are red-shifted with the increasing sizes of quantum dots. It has been observed that the first peak of the linear optical absorption, which represents the optical gap, is not the most intense peak. This result is in excellent agreement with the experimental data, but in stark contrast to the predictions of the tight-binding model, according to which the first peak is the most intense peak, pointing to the importance of electron-correlation effects. Furthermore, a...

Basak, Tista; Shukla, Alok

2015-01-01T23:59:59.000Z