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1

El laberinto de la indigenidad: Cómo se determina quién es indígena maya ch’orti’ en Guatemala, Honduras y El Salvador  

E-Print Network [OSTI]

Determining who is indigenous does not seem a problem, but when one goes to the Ch’orti’ Maya region of Guatemala, Honduras, and El Salvador, one soon realizes that nothing can be taken for granted. If one begins with universal criteria...

Metz, Brent

2012-01-01T23:59:59.000Z

2

Guatemala-Enhancing Capacity for Low Emission Development Strategies...  

Open Energy Info (EERE)

Guatemala-Enhancing Capacity for Low Emission Development Strategies (EC-LEDS) Jump to: navigation, search Name Guatemala-Enhancing Capacity for Low Emission Development Strategies...

3

An overview of the poultry industry of Guatemala  

E-Print Network [OSTI]

Chicken Farms in Guatemala 2 Typical Open Sided Houses in Guatemala Disinfecting Pool on a Breeder Farm in Guatemala in 1988 a New Hatchery Floor Plan of Company A 8 Company A Egg Store for Small Quantity Buyers . . . 59 Registered Uncommon Poultry... Farms in Guatemala . . 77 7 t ' g Blood to 7 t f S 1 o 1111 g '1 and Fowl Typhoid in Breeders in Company A 8 Testing fo- Nycoplasmosis in Breeder Pul lets in Company A 9 Coryza Epidemic on the Breeder Farm in Company 4 92 10 Typical Poultry Supply...

Braly Lopez, Esther Yvette

1989-01-01T23:59:59.000Z

4

Guatemala: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy Resources Jump to: navigation,Ohio:Greer County is a county inAl., It is classified(RECP) inGuatemala:

5

Unearthing Collaboration: Community and Multivocal Archaeology in Highland Guatemala  

E-Print Network [OSTI]

The Proyecto Arqueológico Chocolá in Chocolá, Guatemala had been successful for three seasons until the perception of archaeology among the community residents changed. The tranquil community comprised primarily of K'iche' ...

Kraemer, Anne

2008-05-13T23:59:59.000Z

6

International Studies Office Student travel to Guatemala, Honduras, El Salvador and Nicaragua Restricted  

E-Print Network [OSTI]

International Studies Office Student travel to Guatemala, Honduras, El Salvador and Nicaragua Committee for Education Abroad has restricted student travel to Guatemala, Honduras, El Salvador Salvador, Honduras, and Nicaragua may follow the guidelines documented at: Procedures. The decision

Acton, Scott

7

E-Print Network 3.0 - alta verapaz guatemala Sample Search Results  

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

(DC.) Benth. and Clitoria L. are the only members of subtribe Clitoriinae Summary: and Tabasco) and Guatemala (Alta Verapaz, Peten). Rare in the Mexican Yucatn Peninsula area....

8

Estimating the effects of new product promotion on U.S. beef in Guatemala  

E-Print Network [OSTI]

to promotion activities that launched three new U.S. beef value cuts in Guatemala’s Hotel, Restaurant and Institutional (HRI) sector were estimated by applying the Parks Model of Generalized Least Squares regression to pooled, time-series and cross sectional...

Leister, Amanda Marie

2009-06-02T23:59:59.000Z

9

Junior Master Gardener® Programs in Rural Guatemala: A Model for International Youth Development Programs  

E-Print Network [OSTI]

rural schools in Guatemala participated in six weeks of JMG lessons. Students completed pre-and post- science knowledge tests, and pre-and post- science attitude and life skills surveys. Teachers completed surveys to evaluate their perceptions of JMG...

Mcgucken, Anna Mae

2014-01-13T23:59:59.000Z

10

A Study of Sustainable Compost Micro-Enterprise In Chimaltenango, Guatemala: Profitability and Employee Characteristics  

E-Print Network [OSTI]

Over 13 million people live in Guatemala, and among this population more than 50% live below the poverty line. One proposed solution to mitigate the large percentage of poverty in the country is micro-entrepreneurship. A compost micro...

Silberg, Timothy

2012-02-14T23:59:59.000Z

11

Human skeletal remains of the ancient Maya in the caves of Dos Pilas, Guatemala  

E-Print Network [OSTI]

This study focuses on the assessment of the depositional activity that occurred in six caves of the Petexbatun region of the Peten, Guatemala through a quantitative analysis of the human skeletal material recovered from them. Five of these caves...

Minjares, Amador, Jr.

2004-09-30T23:59:59.000Z

12

Unthinkable Rebellion and the Praxis of the Possible: Ch'orti' Campesin@ Struggles in Guatemala's Eastern Highlands  

E-Print Network [OSTI]

Garcia, S. Bastos & M. Camus (Eds. ), Guatemala: violenciasScientific. Bastos, S. , & Camus, M. (1992). Quebrando elon the other (Bastos & Camus, 1992; Cojtí Cuxil, 1997;

Casolo, Jennifer Jean

2011-01-01T23:59:59.000Z

13

The Violence after 'La Violencia' in the Ch'orti' Region of Eastern Guatemala  

E-Print Network [OSTI]

men involved in narco-trafficking who were gunned down in Honduras in 2008. Cocaine especially is available everywhere. When López was buying a beer recently at a corner cantina, he was offered a naringazo, or a line of cocaine, for about $6.50. One... Guatemala, or the Oriente, is taken into consideration at all in representations of Guatemala, it is depicted as a parched land of hot-tempered, gun-slinging, lawless ladinos (non-indigenous Hispanics with various cultural and phenotypic heritages). Part...

Metz, Brent; Mariano, Lorenzo; Garcí a, Juliá n Ló pez

2010-01-01T23:59:59.000Z

14

SO2 emissions to the atmosphere from active volcanoes in Guatemala and El Salvador, 19992002  

E-Print Network [OSTI]

SO2 emissions to the atmosphere from active volcanoes in Guatemala and El Salvador, 1999 Estudios Territoriales, km 5.5 Carretera a Nueva San Salvador, Avenida Las Mercedes, San Salvador, El Salvador, Central America d Joint Center for Earth Systems Technology (NASA/UMBC), University of Maryland

Rose, William I.

15

RURAL-FRONTIER MIGRATION AND DEFORESTATION IN THE SIERRA DE LACANDON NATIONAL PARK, GUATEMALA  

E-Print Network [OSTI]

RURAL-FRONTIER MIGRATION AND DEFORESTATION IN THE SIERRA DE LACANDON NATIONAL PARK, GUATEMALA Robinson #12;ii © 2002 David L. Carr ALL RIGHTS RESERVED #12;iii ABSTRACT DAVID L. CARR: Rural-frontier the greatest risk for migration to the frontier. Evidently, attention to both migration origin and destination

Lopez-Carr, David

16

Creating the political spectacle during the Cold War: Guatemala and the United States  

E-Print Network [OSTI]

confidantes, spoke hc . " ~Th V B M, p, 112, Communist Party, otherwise know as the Partido Guatemalteco del Trabajo (PGT). Decree 900 combined with Arbenz's close relationship to Fortuny was what led to US plans for Operation PBSUCCESS. American interests..., and Guatemala's Social Security program. In order to bolster their image in the media and build new power bases, each of these positions was filled by communists. With only a few Communists elected to Congress, Arbenz and the PGT were slowly building a...

Burton, Michael Cassidy

2013-02-22T23:59:59.000Z

17

An analysis of cattle-farming in the coffee producing area of the Pacific Slope in Guatemala  

E-Print Network [OSTI]

AN ANALYSIS OF CATTLE-FARMING IN THE COFFEE PRODUCING AREA OF THE PACIFIC SLOPE IN GUATEMALA A Thesis By OSCAR HUMBERTO CORDON Submitted to the Graduate College of the Texas ASM University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE January 1967 Ma]or Sub]ect: Animal Science AN ANALYSIS OF CATTLE-FARMING IN THE COFFEE PRODUCING AREA OF THE PACIFIC SLOPE IN GUATEMALA A Thesis By OSCAR HUMBERTO CORDON Approved as to style and content by: airman...

Cordon, Oscar Humberto

1967-01-01T23:59:59.000Z

18

A Comparative Analysis of Mestizo and Indigenous Mayan Young Women in Guatemala: Attitudes and Knowledge of Sexual Reproduction and Health among Members of Children International's Youth Health Corps  

E-Print Network [OSTI]

Children International’s Youth Health Corps Program uses Peer Education techniques to teach impoverished adolescents about Sexual Health and Reproduction. In the Youth Health Corps in Guatemala, both rural indigenous Maya ...

Trapp, Sarah Casement

2011-04-21T23:59:59.000Z

19

Through the Lens of Pater-Americanism: A Comparative Analysis of the Eisenhower Administration's Perception of Guatemala and Bolivia, 1953 and 1954  

E-Print Network [OSTI]

This thesis examines the diverging responses of the Eisenhower Administration in the US to the Arbenz government in Guatemala and the Paz government in Bolivia in 1953 and 1954. This divergence occurred in spite of strong similarities between...

Moulton, Aaron Coy

2009-06-06T23:59:59.000Z

20

An Expression of Cultural Change: Invisible Converts to Protestantism Among Highland Guatemala Mayas  

E-Print Network [OSTI]

s t an t , a n d the r e m a i n i n g 87 per cent Ca tho l ic . Of the p resen t gene ra t ion ' s g r a n d p a r e n t s , on ly a b o u t 3 p e r cen t were Pro tes tan t . Th i s r ecen t and r ap id ra te of c o n v e r s i o n is associa ted w i t h a...AN EXPRESSION OF CULTURAL CHANGE: INVISIBLE CONVERTS TO PROTESTANTISM AMONG HIGHLAND GUATEMALA MAYAS Li l i ana R . G o l d i n a n d B r e n t M e t z State U n i v e r s i t y of N e w Y o r k , A l b a n y T h e process of re l ig ious...

Goldin, Liliana R.; Metz, Brent

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" 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

La prise en compte des populations locales dans la mise en place d'aires protges : tudes de cas au Guatemala et au Maroc  

E-Print Network [OSTI]

au Guatemala et au Maroc Par Vincens Côté essai présenté au Département de biologie pour l la gestion de deux aires protégées, l'une au Guatemala et l'autre au Maroc, et tente d'en dégager des scientifiques ont été utilisés pour déterminer la nature de la protection. Au Maroc, les premières lois sur les

Vellend, Mark

22

De de se  

E-Print Network [OSTI]

In this dissertation, I argue against a unitary treatment of individual de se ascription. Based on consideration of Yoruba logophors and English dream-report pronouns, I show that one mechanism is best analyzed as binding ...

Anand, Pranav

2006-01-01T23:59:59.000Z

23

Petroleum geology of Pacific margin of Central America and northern South America, from Guatemala to Ecuador  

SciTech Connect (OSTI)

Exploration for hydrocarbons along the Pacific margin of Central America and northern South America has been limited and spasmodic. Less than 100 exploration wells have been drilled, with nearly 50 of these being in the Santa Elena, Progreso, and Guayas basins in Ecuador. Shows have been reported in some wells, and a few oil seeps are known. The only commercial production established to date has been from the Santa Elena Peninsula in Ecuador in the extreme south of the study area. Understanding of the geology in this part of the continental margin is incomplete at best. This paper reviews present-day knowledge in an attempt to define the sedimentary basins better, to characterize their structure and stratigraphy, and to assess their petroleum prospects. The area of continental margin reviewed is to the north, located northwest of the trench system where oceanic crust of the Cocos plate subducts under the Caribbean plate, and to the south, where the northern part of the Nazca plate collides with the South American plate. This plate tectonic setting forms the framework on which local structural and sedimentary events have created a series of relatively small trench-slope and forearc basins in what is now the coastal plain and adjacent offshore area of Central and South America, south or west of a line of mountain ranges with active volcanism. Sedimentary fill is generally of Tertiary age. The basins and subbasins recognized and described include: in Ecuador - Guayas, Santa Elena, Progreso, Valdivia, Bajo Grande, Manta, Muisne-Esmeraldas, and Borbon; in Colombia - Choco-Pacific; in Panama - Gulf of Panama basin complex (Santiago, Tonosi, Sambu), and Burica-Chiriqui; in Costa Rica - Terraba and Coronado/Tempisque; in Nicaragua - San Juan del Sur; and in the Honduras, El Salvador, and Guatemala - the Pacific coastal basin.

Scrutton, M.E.; Escalante, G.F.

1986-07-01T23:59:59.000Z

24

Examining the Proximate and Underlying Causes of Tropical Deforestation: Migration and Land Use in the Sierra de Lacandn National Park, Guatemala1  

E-Print Network [OSTI]

1 Examining the Proximate and Underlying Causes of Tropical Deforestation: Migration and Land Use In explaining variability in tropical deforestation, scholars have focused almost exclusively on in situ (or "on causes of deforestation in the humid tropics with a case study from Guatemala. To investigate the first

Lopez-Carr, David

25

Proximate and Underlying Causes of Tropical Deforestation: The Event Ecology of Migration and Forest Conversion in the Sierra de Lacandn National Park, Guatemala1  

E-Print Network [OSTI]

1 Proximate and Underlying Causes of Tropical Deforestation: The Event Ecology of Migration deforestation, scholars of land use/cover change (LUCC) have focused almost exclusively on in situ (or "on causes of deforestation in the humid tropics with a case study from Guatemala. To investigate the first

Lopez-Carr, David

26

directory of reSeArcherS  

E-Print Network [OSTI]

Applied ScienceS directory of reSeArcherS SPRING 2014 DIRECTORY #12;2 " WelcoMetothe fAcUlty of Applied ScienceS, Where We Are coMMitted to eXcellence in teAchinG, reSeArch And innovAtion.thiS directory

27

directory of reSeArcherS  

E-Print Network [OSTI]

Applied ScienceS directory of reSeArcherS SPRING 2013 DIRECTORY #12;2 " WelcoMetothe fAcUlty of Applied ScienceS, Where We Are coMMitted to eXcellence in teAchinG And reSeArch. thiS directory Will ASSi

Kavanagh, Karen L.

28

High Performance of InSe and InSeGraphene Heterostructure Based Wide Spectral Photodetectors  

E-Print Network [OSTI]

We investigated both the few-layered InSe/metal photodetectors and InSe/graphene heterostructure photodetectors. Both types of the photodetectors show broad spectral range at 400-1000 nm. The few-layered InSe/metal photodetectors have higher photoresponsivity than that of the InSe/graphene heterostructure photodetectors. However, the InSe/graphene heterostructure photodetectors possesses a fast response time down to 100 {\\mu}s, which is about 40 times faster than that of the InSe/metal devices. The design of 2D crystal/graphene heterostructure could be important for high performace optoelectronic devices.

Luo, Wengang; Hu, Pingan; Cai, Kaiming; Feng, Qi; Yan, Faguang; Yan, Tengfei; Zhang, Xinhui; Wang, Kaiyou

2015-01-01T23:59:59.000Z

29

Bioavailability of Particle-Associated Se to the Bivalve Potamocorbula  

E-Print Network [OSTI]

of Se(0) by generatingradioisotopic75Se(0)throughbacterialdissimilatory reduction of 75SeO3 2- by pure by reducing 75SeO3 2- with ascorbic acid (AA). Speciation determinations showed that AA and SES were >90% Se(0. After 113 d of incubation, 36% of SES Se(0) was oxidized to SeO3 2-. Assimilation of total particulate

30

www.ave.kth.se Rail Vehicles  

E-Print Network [OSTI]

www.ave.kth.se Rail Vehicles Part of the Masters program in Vehicle Engineering Master's Thesis: Validation of wheel wear calculation code Background Rail vehicle operators have a genuine concern about wheel and rail wear prediction methodologies, due to the influence of worn profiles in the cost of both

Haviland, David

31

Anisotropy in CdSe quantum rods  

SciTech Connect (OSTI)

The size-dependent optical and electronic properties of semiconductor nanocrystals have drawn much attention in the past decade, and have been very well understood for spherical ones. The advent of the synthetic methods to make rod-like CdSe nanocrystals with wurtzite structure has offered us a new opportunity to study their properties as functions of their shape. This dissertation includes three main parts: synthesis of CdSe nanorods with tightly controlled widths and lengths, their optical and dielectric properties, and their large-scale assembly, all of which are either directly or indirectly caused by the uniaxial crystallographic structure of wurtzite CdSe. The hexagonal wurtzite structure is believed to be the primary reason for the growth of CdSe nanorods. It represents itself in the kinetic stabilization of the rod-like particles over the spherical ones in the presence of phosphonic acids. By varying the composition of the surfactant mixture used for synthesis we have achieved tight control of the widths and lengths of the nanorods. The synthesis of monodisperse CdSe nanorods enables us to systematically study their size-dependent properties. For example, room temperature single particle fluorescence spectroscopy has shown that nanorods emit linearly polarized photoluminescence. Theoretical calculations have shown that it is due to the crossing between the two highest occupied electronic levels with increasing aspect ratio. We also measured the permanent electric dipole moment of the nanorods with transient electric birefringence technique. Experimental results on nanorods with different sizes show that the dipole moment is linear to the particle volume, indicating that it originates from the non-centrosymmetric hexagonal lattice. The elongation of the nanocrystals also results in the anisotropic inter-particle interaction. One of the consequences is the formation of liquid crystalline phases when the nanorods are dispersed in solvent to a high enough concentration. The preparation of the stable liquid crystalline solution of CdSe nanorods is described, as well as the large-scale alignment of the nanorods by taking advantage of the long-range orientational correlation in the liquid crystals. In addition, we investigated the phase diagram of the nanorod solution, as a step toward understanding the possible role of the long-range attractive interaction between the nanorods in the formation of lyotropic liquid crystals.

Li, Liang-shi

2003-09-01T23:59:59.000Z

32

I2SE | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy Resources Jump to: navigation,Ohio:GreerHiCalifornia: Energythe SecondInformation 3 -2 -2 - IdahoI2SE

33

Synthesis and optical study of green light emitting polymer coated CdSe/ZnSe core/shell nanocrystals  

SciTech Connect (OSTI)

Highlights: ? Synthesis of Polymer coated core CdSe and CdSe/ZnSe core/shell NCs. ? From TEM image, the spherical nature of CdSe and CdSe/ZnSe is obtained. ? Exhibiting green band photoemission peak at 541 nm and 549 nm for CdSe core and CdSe/ZnSe core/shell NCs. ? The shell thickness has been calculated by using superposition of quantum confinement energy model. - Abstract: CdSe/ZnSe Core/Shell NCs dispersed in PVA are synthesized by chemical method at room temperature. This is characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV/Vis spectra and photoluminescence spectroscopy (PL). TEM image shows the spherical nature of CdSe/ZnSe core/shell NCs. The red shift of absorption and emission peak of CdSe/ZnSe core/shell NCs as compared to CdSe core confirmed the formation of core/shell. The superposition of quantum confinement energy model is used for calculation of thickness of ZnSe shell.

Tripathi, S.K., E-mail: surya@pu.ac.in [Department of Physics, Center of Advanced Study in Physics, Panjab University, Chandigarh 160 014 (India); Sharma, Mamta [Department of Physics, Center of Advanced Study in Physics, Panjab University, Chandigarh 160 014 (India)

2013-05-15T23:59:59.000Z

34

Thermoelectric figure of merit of Ag{sub 2}Se with Ag and Se excess  

SciTech Connect (OSTI)

In the temperature range of 100-300 K, the electric ({sigma}) and thermoelectric ({alpha}{sub 0}) properties of Ag{sub 2}Se with an excess of Ag as high as {approx}0.1 at. % and Se as high as {approx}1.0 at. %, respectively, are investigated. From the data on {sigma}, {alpha}{sub 0}, and {chi}{sub tot} (thermal conductivities), the thermoelectric power {alpha}{sub 0}{sup 2}{sigma} and the figure of merit Z are calculated. It is found that {alpha}{sub 0}{sup 2}{sigma} and Z attain the peak values at room temperature and the electron concentration n {approx} 6.5 x 10{sup 18} cm{sup -3}.

Aliev, F. F., E-mail: farzali@physics.ab.az; Jafarov, M. B.; Eminova, V. I. [Azerbaijan National Academy of Sciences, Institute of Physics (Azerbaijan)

2009-08-15T23:59:59.000Z

35

Cotinga Alirrufa La Cotinga Alirrufa se distribuye en  

E-Print Network [OSTI]

. inventarios y su estudio, la situación actual de esta especie en Colombia. Se considera casi Aphanotriccus

Cuervo, Andrés

36

Fluorescence relaxation dynamics of CdSe and CdSe/CdS core/shell quantum dots  

SciTech Connect (OSTI)

Time-resolved fluorescence spectra for colloidal CdSe and CdSe/CdS core/shell quantum dots have been investigated to know their electron relaxation dynamics at the maximum steady state fluorescence intensity. CdSe core and CdSe/CdS type I core-shell materials with different shell (CdS) thicknesses have been synthesized using mercaptoacetic acid as a capping agent. Steady state absorption and emission studies confirmed successful synthesis of CdSe and CdSe/CdS core-shell quantum dots. The fluorescence shows a tri-exponential decay with lifetimes 57.39, 7.82 and 0.96 ns for CdSe quantum dots. The lifetime of each recombination decreased with growth of CdS shell over the CdSe core, with maximum contribution to fluorescence by the fastest transition.

Kaur, Gurvir; Kaur, Harmandeep [Centre of Advanced Study in Physics, Department of Physics, Panjab University, Chandigarh-160014 (India); Tripathi, S. K., E-mail: surya@pu.ac.in [Centre of Advanced Study in Physics, Panjab University, Chandigarh- 160014 (India)

2014-04-24T23:59:59.000Z

37

Spectral photoresponse of ZnSe/GaAs(001) heterostructures with CdSe ultra-thin quantum well insertions  

SciTech Connect (OSTI)

We present a study of the spectral photoresponse (SPR) of ZnSe/GaAs(001) heterostructures for different ZnSe film thickness with and without CdSe ultra-thin quantum well (UTQW) insertions. We observe a significant increase of the SPR of heterostructures containing 3 monolayer thick CdSe UTQW insertions; these results encourage their use in photodetectors and solar cells.

Valverde-Chávez, D. A.; Sutara, F.; Hernández-Calderón, I. [Physics Department, Cinvestav-IPN, Av. IPN 2508, 07360 México, DF (Mexico)

2014-05-15T23:59:59.000Z

38

Twinning effect on photoluminescence spectra of ZnSe nanowires  

SciTech Connect (OSTI)

Bandgap engineering in a single material along the axial length of nanowires may be realized by arranging periodic twinning, whose twin plane is vertical to the axial length of nanowires. In this paper, we report the effect of twin on photoluminescence of ZnSe nanowires, which refers to the bandgap of it. The exciton-related emission peaks of transverse twinning ZnSe nanowires manifest a 10-meV-blue-shift in comparison with those of longitudinal twinning ZnSe nanowires. The blue-shift is attributed to quantum confinement effect, which is influenced severely by the proportion of wurtzite ZnSe layers in ZnSe nanowires.

Xu, Jing; Wang, Chunrui, E-mail: crwang@dhu.edu.cn; Wu, Binhe; Xu, Xiaofeng [Department of Applied Physics and State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, 2999 Renmin Rd. North, Songjiang District, Shanghai 201620 (China); Chen, Xiaoshuang [Department of Applied Physics and State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, 2999 Renmin Rd. North, Songjiang District, Shanghai 201620 (China); National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Science, Shanghai 200083 (China); Oh, Hongseok; Baek, Hyeonjun; Yi, Gyu-Chul [Department of Physics and Astronomy, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-747 (Korea, Republic of)

2014-11-07T23:59:59.000Z

39

Thermoelectric transport of Se-rich Ag{sub 2}Se in normal phases and phase transitions  

SciTech Connect (OSTI)

Small amount of Se atoms are used to tune the carrier concentrations (n{sub H}) and electrical transport in Ag{sub 2}Se. Significant enhancements in power factor and thermoelectric figure of merit (zT) are observed in the compositions of Ag{sub 2}Se{sub 1.06} and Ag{sub 2}Se{sub 1.08}. The excessive Se atoms do not change the intrinsically electron-conducting character in Ag{sub 2}Se. The detailed analysis reveals the experiment optimum carrier concentration in Ag{sub 2}Se is around 5?×?10{sup 18}?cm{sup ?3}. We also investigate the temperature of maximum zT and the thermoelectric transport during the first order phase transitions using the recently developed measurement system.

Mi, Wenlong; Lv, Yanhong [State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050 (China); CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences,1295 Dingxi Road, Shanghai 200050 (China); University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049 (China); Qiu, Pengfei; Shi, Xun, E-mail: xshi@mail.sic.ac.cn, E-mail: cld@mail.sic.ac.cn; Chen, Lidong, E-mail: xshi@mail.sic.ac.cn, E-mail: cld@mail.sic.ac.cn [State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050 (China); CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences,1295 Dingxi Road, Shanghai 200050 (China); Zhang, Tiansong [CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences,1295 Dingxi Road, Shanghai 200050 (China)

2014-03-31T23:59:59.000Z

40

Glass formation and the third harmonic generation of Cu{sub 2}Se–GeSe{sub 2}–As{sub 2}Se{sub 3} glasses  

SciTech Connect (OSTI)

We have performed the investigation of the nonlinear optical properties namely the third harmonic generation (THG) of the glass-formation region in the Cu{sub 2}Se–GeSe{sub 2}–As{sub 2}Se{sub 3} system. The samples were synthesized by direct single-temperature method from high-purity elementary substances. We have found that the value of disorder parameter ? depends on the composition of the glassy alloys. The measurements show that increasing the Cu{sub 2}Se concentration leads to increased slope of the absorption edge, which may be explained by the decrease of the height of random potential relief for the electrons in the tails of the state density which border the band edges. A very sharp increase in the THG at low temperature was observed. Significant enhancement in THG was obtained with decreasing the energy gap, which agreed well with the nonlinear optical susceptibilities obtained from other glasses.

Reshak, A. H., E-mail: maalidph@yahoo.co.uk [New Technologies-Research Centre, University of West Bohemia, Univerzitni 8, 306 14 Pilsen (Czech Republic); Center of Excellence Geopolymer and Green Technology, School of Material Engineering, University Malaysia Perlis, 01007 Kangar, Perlis (Malaysia); Klymovych, O. S.; Zmiy, O. F. [Department of Inorganic and Physical Chemistry, Lesya Ukrainka Eastern European National University, Voli Av. 13, 43025 Lutsk (Ukraine); Myronchuk, G. L.; Zamuruyeva, O. V. [Department of Physics, Lesya Ukrainka Eastern European National University, Voli Av. 13, 43025 Lutsk (Ukraine); Alahmed, Z. A. [Department of Physics and Astronomy, King Saud University, Riyadh 11451 (Saudi Arabia); Chyský, J.; Bila, Jiri [Department of Instrumentation and Control Engineering, Faculty of Mechanical Engineering, CTU in Prague, Technicka 4, 166 07 Prague 6 (Czech Republic); Kamarudin, H. [Center of Excellence Geopolymer and Green Technology, School of Material Engineering, University Malaysia Perlis, 01007 Kangar, Perlis (Malaysia)

2014-10-14T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" 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

Workshop on Revisions to SE 2004 Mark Ardis David Budgen  

E-Print Network [OSTI]

Workshop on Revisions to SE 2004 Mark Ardis David Budgen Stevens Institute of Technology University-day workshop on needed revisions to Software Engineering 2004: Curriculum Guidelines for Undergraduate Degree Programs in Software Engineering (SE 2004). A brief overview of the current guidelines and their revision

Ardis, Mark

42

Department of Plant ProtectionDepartment of Plant Protection BiologyBiology (www(www.slu.se).slu.se)  

E-Print Network [OSTI]

the safety manual as a useful tool in the safety work. Safety work is an on-going process, if something.2.3 Greenhouse connected to the Horticum building 6. Radioactivity (from the ICM safety manual) 6.1 working(www.slu.se).slu.se) Safety Manual January, 2013 Note: Suggestions for improvements and updates are necessary to keep

43

p1 RJM 07/01/14 SE3SE11 -Sustainable Electrical Energy -Gaia Dr Richard Mitchell 2014  

E-Print Network [OSTI]

p1 RJM 07/01/14 SE3SE11 - Sustainable Electrical Energy - Gaia © Dr Richard Mitchell 2014 1 : Sustainable Electrical Energy - Gaia This module considers the sustainable aspects of Electrical Energy For instance, various colleagues, including Dr George Whitfield, researched photovoltaic solar systems

Mitchell, Richard

44

Inkrafttreten Diese Ordnung tritt mit Genehmigung durch die Se-  

E-Print Network [OSTI]

§ 7 Inkrafttreten Diese Ordnung tritt mit Genehmigung durch die Se- natorin für Bildung und. Artikel 2 Die �nderung tritt nach der Genehmigung des Rek- tors mit Wirkung vom 1. Oktober 2007 in Kraft

Hoffmeister, Thomas S.

45

Hot exciton transport in ZnSe quantum wells  

E-Print Network [OSTI]

The in-plane transport of excitons in ZnSe quantum wells is investigated directly by microphotoluminescence in combination with a solid immersion lens. Due to the strong Froehlich coupling, the initial kinetic energy of the excitons is well...

Zhao, Hui; Moehl, Sebastian; Wachter, Sven; Kalt, Heinz

2002-02-01T23:59:59.000Z

46

Lattice vibrations of pure and doped GaSe  

SciTech Connect (OSTI)

The Bridgman method is used to grow especially undoped and doped single crystals of GaSe. Composition and impurity content of the grown crystals were determined using X-ray fluorescence (XRF) method. X-ray diffraction, Raman scattering, photoluminescence (PL), and IR transmission measurements were performed at room temperature. The long wavelength lattice vibrations of four modifications of GaSe were described in the framework of modified one-layer linear-chain model which also takes into consideration the interaction of the selenium (Se) atom with the second nearest neighbor gallium (Ga) atom in the same layer. The existence of an eight-layer modification of GaSe is suggested and the vibrational frequencies of this modification are explained in the framework of a lattice dynamical model considered in the present work. Frequencies and the type of vibrations (gap, local, or resonance) for the impurity atoms were calculated and compared with the experimental results.

Allakhverdiev, K. [Materials Institute, Marmara Research Center, TUBITAK, Gebze/Kocaeli 41470 (Turkey) and Institute of Physics, Azerbaijan National Academy of Sciences, Baku AZ1143 (Azerbaijan)]. E-mail: kerim.allahverdi@mam.gov.tr; Baykara, T. [Materials Institute, Marmara Research Center, TUBITAK, Gebze/Kocaeli 41470 (Turkey); Ellialtioglu, S. [Department of Physics, Middle East Technical University, Ankara 06531 (Turkey); Hashimzade, F. [Institute of Physics, Azerbaijan National Academy of Sciences, Baku AZ1143 (Azerbaijan); Huseinova, D. [Institute of Physics, Azerbaijan National Academy of Sciences, Baku AZ1143 (Azerbaijan); Kawamura, K. [Institute of Materials Science, University of Tsukuba 305-8573 (Japan); Kaya, A.A. [Materials Institute, Marmara Research Center, TUBITAK, Gebze/Kocaeli 41470 (Turkey); Kulibekov, A.M. [Department of Physics, Mugla University, Mugla 48000 (Turkey); Onari, S. [Institute of Materials Science, University of Tsukuba 305-8573 (Japan)

2006-04-13T23:59:59.000Z

47

Nanoscale order in ZnSe:(Mg, O)  

SciTech Connect (OSTI)

Self-assembling of 1O4Mg identical tetrahedral clusters resulting in the nanoscale order in ZnSe:(Mg, O) is presented. Co-doping transforms ZnSe into Mg{sub x}Zn{sub 1?x}O{sub y}Se{sub 1?y} alloy of MgO, MgSe, ZnO and ZnSe. The decrease of a sum of the enthalpies of the constituent compounds and diminution of the strain energy are the causes of this phenomenon. The self-assembling conditions are obtained from the free energy minimum when magnesium and oxygen are in the dilute and ultra dilute limits, correspondingly. The occurrence of 1O4Mg clusters and completion of self-assembling when all oxygen atoms are in clusters are results of the continuous phase transitions. The self-assembling occurrence temperature does not depend on the oxygen content and it is a function of magnesium concentration. Mg{sub x}Zn{sub 1?x}O{sub y}Se{sub 1?y} with all oxygen atoms in clusters can be obtained in temperature ranges from T = 206 °C (x = 0.001, y = 1×10{sup ?4}) to T = 456 °C (x = 0.01, y = 1×10{sup ?4}) and from T = 237 °C (x = 0.001, y = 1×10{sup ?6}) to T = 462 °C (x = 0.01, y = 1×10{sup ?6})

Elyukhin, Vyacheslav A. [Department of Electrical Engineering, Centro de Investigación y de Estudios Avanzados del IPN, Avenida Instituto Politecnico Nacional 2508, 07360 México (Mexico)

2014-02-21T23:59:59.000Z

48

Estudios de Medicina A los 16 aos se matricula de Medicina en el CEU, el primer ao que se  

E-Print Network [OSTI]

1 Estudios de Medicina A los 16 años se matricula de Medicina en el CEU, el primer año que se Grado de Licenciatura (1982), en la recién creada Facultad de Medicina de Alicante. El acontecimiento Facultad de Medicina de Alicante. En 1984 es Jefe de la Unidad de Educación Sanitaria y en 1988, Jefe de la

Escolano, Francisco

49

al publico sobre: Topics by E-print Network  

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

de Argentina, Cuba, Colombia, Chile (exilio), EE.UU., Guatemala, Uruguay (exilio) y Venezuela. De todos los temas tratados, se enfatizo principalmente la "Profesionalizacin en...

50

Postal address P.O. Box 118, SE-221 00 LUND Visiting address John Ericssons vg 3 Telephone switchboard +46 46-222 00 00 E-mail outgoing@kansli.lth.se Internet http://www.lth.se  

E-Print Network [OSTI]

switchboard +46 46-222 00 00 E-mail outgoing@kansli.lth.se Internet http://www.lth.se International Office Telephone switchboard +46 46-222 00 00 E-mail outgoing@kansli.lth.se Internet http://www.lth.se ARGENTINA Sciences (Lahti Yrkeshögskola) Oulun yliopisto Tampereen Teknillinen Korkeakoulu University of Lapland

51

Structural Changes in Vitreous GeSe4 under Pressure  

SciTech Connect (OSTI)

High-energy X-ray diffraction experiments have been performed on GeSe{sub 4} glass up to pressures of 8.6 GPa, and the equation of state has been measured up to 10 GPa. The X-ray structure factors reveal a decrease in the first sharp diffraction peak intensity and broadening with pressure, which signifies a break-up of the intermediate range order in the glass. In contrast, the principal peak in the structure factor shows an increase in intensity and a sharpening with pressure, which is attributed to an increase in extended range order and coherence of the compacted units. The average nearest neighbor coordination number is found to remain constant in GeSe{sub 4} glass (within experimental error) over the pressure range measured. This is in contrast with the gradual increase found in GeSe{sub 2} glass. Rather, in GeSe{sub 4} glass the densification mechanism is shown to be associated with large inward shifts of the second neighbor and higher coordination shells. These features appear as additional correlations at 3.3 and 5.3 {angstrom} in the differences taken between adjacent pair distribution functions with increasing pressure.

Skinner L. B.; Parise J.; Benmore, C.J,; Antao, S.; Soignard, E.; Amin, S.A.; Bychkov, E.; Rissi, E. and Yarger, J.L.

2011-11-21T23:59:59.000Z

52

Synthesis of a Se0 /Calcite Composite Using Hydrothermal  

E-Print Network [OSTI]

Synthesis of a Se0 /Calcite Composite Using Hydrothermal Carbonation of Ca(OH)2 Coupled in a batch system by hydrothermal carbonation of calcium hydroxide under high CO2-Ar pressure (90 bar. The carbonate matrix was constituted by nano- to microrhombohedral crystals (

Montes-Hernandez, German

53

Synthesis of a Se0 /calcite composite using hydrothermal1  

E-Print Network [OSTI]

1 Synthesis of a Se0 /calcite composite using hydrothermal1 carbonation of Ca(OH)2 coupled800141p #12;2 Abstract1 2 In this study, the hydrothermal carbonation of calcium hydroxide under high CO2 "crystalline elemental selenium" (carbonate matrix was constituted

Paris-Sud XI, Université de

54

www.sida.se The Impact of the Global Economic  

E-Print Network [OSTI]

www.sida.se The Impact of the Global Economic Crisis on Women's Well-Being and Empowerment Sida, December 02, 2010 Publication series: Women's Economic Empowerment A worker at a steel recycling mill.m.B. Akash #12;#12;A Guide to Principles, Procedures and Working Methods MariaS.Floro AssociateProfessor,DepartmentofEconomics

Lansky, Joshua

55

KTH Aeronautical and Vehicle Engineering, Teknikringen 8, SE-10044 Stockholm. Phone: +46 70 6522441. E-mail: mabe@kth.se Pg: 1 56 53-9. Bg: 895-9223. VAT: SE202100305401. www.kth.se  

E-Print Network [OSTI]

KTH Aeronautical and Vehicle Engineering, Teknikringen 8, SE-10044 Stockholm. Phone: +46 70 6522441 on Energy Usage of Tracked Taxis Car-like vehicles running on elevated guideways in urban areas or airports vehicles and traditional vehicles, including both measurements and simulations. - Study the rolling

Haviland, David

56

se de doctorat en informatique Comprendre le Web cach  

E-Print Network [OSTI]

niveau à l'aide de telles descriptions. Abstract e hidden Web (also known as deep or invisible Web'informations, complexité Keywords: hidden Web, deep Web, databases, information extraction, complexity tel-00198150,versionèse de doctorat en informatique Comprendre le Web caché Understanding the Hidden Web Pierre

Paris-Sud XI, Université de

57

Reverse Monte Carlo simulation of Se{sub 80}Te{sub 20} and Se{sub 80}Te{sub 15}Sb{sub 5} glasses  

SciTech Connect (OSTI)

Two-dimensional Monte Carlo of the total pair distribution functions g(r) is determined for Se{sub 80}Te{sub 20} and Se{sub 80}Te{sub 15}Sb{sub 5} alloys, and then it used to assemble the three-dimensional atomic configurations using the reverse Monte Carlo simulation. The partial pair distribution functions g{sub ij}(r) indicate that the basic structure unit in the Se{sub 80}Te{sub 15}Sb{sub 5} glass is di-antimony tri-selenide units connected together through Se-Se and Se-Te chain. The structure of Se{sub 80}Te{sub 20} alloys is a chain of Se-Te and Se-Se in addition to some rings of Se atoms.

Abdel-Baset, A. M.; Rashad, M. [Physics Department, Faculty of Science , Assiut University, Assiut, P.O. Box 71516 (Egypt); Moharram, A. H. [Faculty of Science, King Abdul Aziz Univ., Rabigh Branch, P.O. Box 433 (Saudi Arabia)

2013-12-16T23:59:59.000Z

58

APS/DPP 111207-se 1 University Fusion Association Meeting  

E-Print Network [OSTI]

University Funding FY 2007-2008 ($ Millions) Program Element FY 2007 FY 2008 Sept Plan Oct Plan · C.0 · HEDLP 1.8 1.9 · Intl, Diagnostics, HBCU, Other 4.3 4.8 · Total University Funding 76.8 78.1 #12;APSAPS/DPP 111207-se 1 University Fusion Association Meeting Orlando, FL November 12, 2007 Stephen

59

LG: Order (2014-SE-15011) | Department of Energy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeatMulti-Dimensionalthe10 DOEWashington, DCKickoffLDV HVACResearchof4-SE-15011) LG:

60

24 Guatemala 1 1 COLLEGES (STUDENTS)  

E-Print Network [OSTI]

Costa Rica 3 46 Malaysia 7 80 United Arab Emirates 2 13 Cyprus 1 47 Mauritania 1 81 United Kingdom 13 14

Collins, Gary S.

Note: This page contains sample records for the topic "guatemala se mencionan" 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

VIGILANTE: Violence and Security in Postwar Guatemala  

E-Print Network [OSTI]

225–246. New York: Routledge. Graeber, David 2011 Debt: TheUS healthcare crisis attests (Graeber 2011). The communalover the last forty years (Graeber 2011, Greenhouse 2010,

Sharp, Ellen Jane

2014-01-01T23:59:59.000Z

62

LAS HORMIGAS (HYMENOPTERA: FORMICIDAE) DE GUATEMALA  

E-Print Network [OSTI]

hormigas, a partir de publicacio- nes taxonómicas recientes e inventarios intensivos del proyec- to LLAMA

Schultz, Ted

63

Determination of Mass Attenuation Coefficients for CuInSe2 and CuGaSe2 Semiconductors  

SciTech Connect (OSTI)

This work presents mass attenuation coefficients values of CuInSe2 and CuGaSe2 semiconductor thin films commonly used in photovoltaic devices. The mass attenuation coefficients were measured at different energies from 11.9 to 37.3 keV by using the secondary excitation method. Monochromatic photons were obtained using the Br, Sr, Mo, Cd, Te, Ba and Nd secondary targets. 59.5 keV gamma rays emitted from an annular Am-241 radioactive source were used to excite secondary targets. Characteristic X-rays emitted from secondary target were counted by a Si(Li) detector with a resolution of 0.16 keV at 5.9 keV. The measured values were compared with theoretical values calculated using WinXCOM program.

Celik, Ahmet; Cevik, Ugur; Baltas, Hasan; Bacaksiz, Emin [Department of Physics, Faculty of Arts and Sciences, Karadeniz Technical University, 61080 Trabzon (Turkey)

2007-04-23T23:59:59.000Z

64

Bi-Se doped with Cu, p-type semiconductor  

DOE Patents [OSTI]

A Bi--Se doped with Cu, p-type semiconductor, preferably used as an absorber material in a photovoltaic device. Preferably the semiconductor has at least 20 molar percent Cu. In a preferred embodiment, the semiconductor comprises at least 28 molar percent of Cu. In one embodiment, the semiconductor comprises a molar percentage of Cu and Bi whereby the molar percentage of Cu divided by the molar percentage of Bi is greater than 1.2. In a preferred embodiment, the semiconductor is manufactured as a thin film having a thickness less than 600 nm.

Bhattacharya, Raghu Nath; Phok, Sovannary; Parilla, Philip Anthony

2013-08-20T23:59:59.000Z

65

Goodman Manufacturing: Order (2011-SE-4301) | Department of Energy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeatMulti-Dimensional Subject: GuidanceNot Measurement Sensitive DOE-1-SE-4301) Goodman

66

SeQuential Biofuels LLC | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revisionEnvReviewNonInvasiveExplorationUT-g Grant ofRichardton AbbeyA Jump to:ScheringScituate WindSeQuential

67

Midea: Order (2013-SE-1505) | Department of Energy  

Energy Savers [EERE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector General Office0-72.pdfGeorgeDoesn't32 MasterAcquisiti ----Energy3-SE-1505) Midea: Order

68

Mile High: Order (2012-SE-4501) | Department of Energy  

Energy Savers [EERE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector General Office0-72.pdfGeorgeDoesn't32 MasterAcquisiti ----Energy3-SE-1505)MidwestOrder

69

Mile High: Proposed Penalty (2012-SE-4501) | Department of Energy  

Energy Savers [EERE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector General Office0-72.pdfGeorgeDoesn't32 MasterAcquisiti ----Energy3-SE-1505)MidwestOrderProposed

70

Structure, nonlinear properties, and photosensitivity of (GeSe2)100-x(Sb2Se3)x glasses  

E-Print Network [OSTI]

-Anne, J. Charrier, J.-P. Guin, and A. Moréac, "Sputtering and pulsed laser deposition for near- and mid-infrared to increase the n2 from 2 to 710-18 m2 /W for As2S3 glass to 11-3010-18 m2 /W for As2Se3 glass at near-infrared measurements were performed with 10 mg powdered samples, heated up to 450°C at heating rate of 10 °C.min-1

71

ENG EC/ME/SE 543 Sustainable Power Systems Page 1/4 ENG EC/ME/SE 543 Sustainable Power Systems: Planning, Operation, and Markets  

E-Print Network [OSTI]

ENG EC/ME/SE 543 Sustainable Power Systems Page 1/4 Syllabus ENG EC/ME/SE 543 Sustainable Power of electrifying the transportation industry, will render electricity the dominant energy form in a sustainable costs. #12;ENG EC/ME/SE 543 Sustainable Power Systems Page 2/4 The handling of technical and economic

72

Geometric Tracking Control of a Quadrotor UAV on SE(3)  

E-Print Network [OSTI]

This paper provides new results for the tracking control of a quadrotor unmanned aerial vehicle (UAV). The UAV has four input degrees of freedom, namely the magnitudes of the four rotor thrusts, that are used to control the six translational and rotational degrees of freedom, and to achieve asymptotic tracking of four outputs, namely, three position variables for the vehicle center of mass and the direction of one vehicle body-fixed axis. A globally defined model of the quadrotor UAV rigid body dynamics is introduced as a basis for the analysis. A nonlinear tracking controller is developed on the special Euclidean group SE(3) and it is shown to have desirable closed loop properties that are almost global. Several numerical examples, including an example in which the quadrotor recovers from being initially upside down, illustrate the versatility of the controller.

Lee, Taeyoung; McClamroch, N Harris

2010-01-01T23:59:59.000Z

73

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

74

Photoluminescence study of the substitution of Cd by Zn during the growth by atomic layer epitaxy of alternate CdSe and ZnSe monolayers  

SciTech Connect (OSTI)

We present a study of the substitution of Cd atoms by Zn atoms during the growth of alternate ZnSe and CdSe compound monolayers (ML) by atomic layer epitaxy (ALE) as a function of substrate temperature. Samples contained two quantum wells (QWs), each one made of alternate CdSe and ZnSe monolayers with total thickness of 12 ML but different growth parameters. The QWs were studied by low temperature photoluminescence (PL) spectroscopy. We show that the Cd content of underlying CdSe layers is affected by the exposure of the quantum well film to the Zn flux during the growth of ZnSe monolayers. The amount of Cd of the quantum well film decreases with higher exposures to the Zn flux. A brief discussion about the difficulties to grow the Zn{sub 0.5}Cd{sub 0.5}Se ordered alloy (CuAu-I type) by ALE is presented.

Hernández-Calderón, I. [Physics Department,Cinvestav, Ave. IPN2508, 07360, México City, DF. (Mexico); Salcedo-Reyes, J. C. [Thin Films Group, Physics Department, Pontificia Universidad Javeriana, Cr. 7 No. 43-82, Ed. 53, Lab. 404, Bogotá, D.C. (Colombia)

2014-05-15T23:59:59.000Z

75

LISTE ELECTORALE BELFORT Bureau Secrtariat SeT NOM PRENOM DEPARTEMENT ETABLISSEMENT  

E-Print Network [OSTI]

Serge FEMTO-ST ENERGIE UFC AHMED Fayez-Shakil SeT UTBM AIT ALI Kahina SeT UTBM AIT-CHEIK-BIHI Wafaa SeT UTBM AMRANE Sofiane FEMTO-ST ENERGIE UFC ASENSIO SAUTO Joseba FEMTO-ST ENERGIE UFC ATTIA Dhouha SeT UTBM BAERT Jérôme FEMTO-ST ENERGIE UFC BAKKALI Zouheir FEMTO-ST ENERGIE UTBM BASSO Gillian SeT UTBM

Jeanjean, Louis

76

E-Print Network 3.0 - altdorf se germany Sample Search Results  

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

altdorf se germany Search Powered by Explorit Topic List Advanced Search Sample search results for: altdorf se germany Page: << < 1 2 3 4 5 > >> 1 195Schweiz. Z.Forstwes. 156...

77

E-Print Network 3.0 - atuba se brasil Sample Search Results  

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

se brasil Search Powered by Explorit Topic List Advanced Search Sample search results for: atuba se brasil Page: << < 1 2 3 4 5 > >> 1 CROCODYLOMORPH EGGS AND EGGSHELLS FROM THE...

78

E-Print Network 3.0 - amor se encontram Sample Search Results  

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

I j encontra-se plantada... intervalo I 0; 4 2; 1; 6 26; R 2 . A horta encontra-se sub-dividida em quatro rectangulos mais... 26; R 2 de12;nido por E ...

79

En Colombia se baila así: Intersectional Bodies, Race, Gender, and Nation Building in the Barranquilla Carnival  

E-Print Network [OSTI]

continente se fusionó la creatividad social del indio y delimportante de la cultura: la creatividad social del hombre.

Tamayo Duque, Ana Maria

2012-01-01T23:59:59.000Z

80

Diffusion of indium and gallium in Cu(In,Ga)Se2 thin film solar cells  

E-Print Network [OSTI]

Diffusion of indium and gallium in Cu(In,Ga)Se2 thin film solar cells O. Lundberga,*, J. Lua , A. Rockettb , M. Edoffa , L. Stolta a A°ngstro¨m Solar Center, Uppsala University, P.O. Box 534, SE-751 21 Abstract The diffusion of indium and gallium in polycrystalline thin film Cu(In,Ga)Se2 layers has been

Rockett, Angus

Note: This page contains sample records for the topic "guatemala se mencionan" 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

DISSERTATION DEVICE PHYSICS OF Cu(In,Ga)Se2 THIN-FILM SOLAR CELLS  

E-Print Network [OSTI]

DISSERTATION DEVICE PHYSICS OF Cu(In,Ga)Se2 THIN-FILM SOLAR CELLS Submitted by Markus Gloeckler PHYSICS OF Cu(In,Ga)Se2 THIN-FILM SOLAR CELLS BE ACCEPTED AS FULFILLING IN PART REQUIREMENTS OF Cu(In,Ga)Se2 THIN-FILM SOLAR CELLS Thin-film solar cells have the potential to be an important

Sites, James R.

82

Phonon and thermal properties of exfoliated TaSe2 thin films T. R. Pope,2  

E-Print Network [OSTI]

Phonon and thermal properties of exfoliated TaSe2 thin films Z. Yan,1 C. Jiang,1 T. R. Pope,2 C. F diselenide (2H-TaSe2) obtained via the "graphene-like" mechanical exfoliation of crystals grown by chemical films exfoliated from TaSe2 and other metal dichalcogenides, as well as for evaluating self

83

Polymorphic transformation in TlSe and the electrical properties of phases  

SciTech Connect (OSTI)

Alloys in the TlSe-Se system on the side of the TlSe compound in the phase diagram have been investigated using differential thermal, X-ray powder diffraction, and microstructural analyses. The phase diagram of the system has been constructed, and the temperature dependences of the electrical conductivity of the phases obtained have been examined. An analysis of the thermograms of alloys in the (TlSe){sub 0.96}-Se{sub 0.04} system has revealed a structural phase transition at a temperature of 470 {+-} 1 K. Investigations into the temperature dependences of the electrical conductivity in the range 120-450 K have demonstrated that the temperature dependence of the electrical conductivity for the (TlSe){sub 0.96}-Se{sub 0.04} alloy exhibits metallic behavior.

Najafov, A. I. [Azerbaijan National Academy of Sciences, Institute of Radiation Problems (Azerbaijan); Guseinov, G. G.; Alekperov, O. Z. [Azerbaijan National Academy of Sciences, Institute of Physics (Azerbaijan); Sardarly, R. M., E-mail: sardarli@yahoo.com; Abdullaev, A. P.; Eyubova, N. A. [Azerbaijan National Academy of Sciences, Institute of Radiation Problems (Azerbaijan)

2008-09-15T23:59:59.000Z

84

High-Pressure Synthesis and Structure Determination of K6(SeO4)(SeO5), The First Potassium Orthoselenate(VI)  

SciTech Connect (OSTI)

The authors report on the first synthesis of a potassium orthoselenate(VI), K{sub 6}(SeO{sub 4})(SeO{sub 5}), and the structure determination from synchrotron powder diffraction data. The title compound crystallizes in the tetragonal space group P4{sub 1}2{sub 1}2 with a = 8.1259(1) {angstrom}, c = 17.4953(2) {angstrom}, V = 1155.21(2) {angstrom}{sup 3}, and Z = 4. Selenium displays two different complex anions, tetrahedral SeO{sub 4}{sup 2-} and trigonal-bipyramidal SeO{sub 5}{sup 4-}. When the formula is reduced to A{sub 3}B, the spatial arrangement of the constituting building units can be derived from the Li{sub 3}Bi type of structure.

Orosel,D.; Dinnebeier, R.; Jansen, M.

2006-01-01T23:59:59.000Z

85

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

86

ADVANCES IN SE-79 ANALYSES ON SAVANNAH RIVER SITE RADIOACTIVE WASTE MATRICES  

SciTech Connect (OSTI)

Waste cleanup efforts underway at the United States Department of Energy's (DOE) Savannah River Site (SRS) in South Carolina, as well as other DOE nuclear sites, have created a need to characterize {sup 79}Se in radioactive waste inventories. Successful analysis of {sup 79}Se in high activity waste matrices is challenging for a variety of reasons. As a result of these unique challenges, the successful quantification of {sup 79}Se in the types of matrices present at SRS requires an extremely efficient and selective separation of {sup 79}Se from high levels of interfering radionuclides. A robust {sup 79}Se radiochemical separation method has been developed at the Savannah River National Laboratory (SRNL) which is routinely capable of successfully purifying {sup 79}Se from a wide range of interfering radioactive species. In addition to a dramatic improvements in the Kd, ease, and reproducibility of the analysis, the laboratory time has been reduced from several days to only 6 hours.

Diprete, D; C Diprete, C; Ned Bibler, N; Cj Bannochie, C; Michael Hay, M

2009-03-16T23:59:59.000Z

87

Photovoltaic Devices Employing Ternary PbSxSe1-x Nanocrystals  

SciTech Connect (OSTI)

We report solar cells based on highly confined nanocrystals of the ternary compound PbSxSe1-x. Crystalline, monodisperse alloyed nanocrystals are obtained using a one-pot, hot injection reaction. Rutherford back scattering and energy filtered transmission electron microscopy suggest that the S and Se anions are uniformly distributed in the alloy nanoparticles. Photovoltaic devices made using ternary nanoparticles are more efficient than either pure PbS or pure PbSe based nanocrystal devices.

Ma, Wanli; Luther, Joseph; Zheng, Haimei; Wu, Yue; Alivisatos, A. Paul

2009-02-05T23:59:59.000Z

88

Synthesis and Crystal Structure Study of 2’-Se-Adenosine-Derivatized DNA  

SciTech Connect (OSTI)

The selenium derivatization of nucleic acids is a novel and promising strategy for 3D structure determination of nucleic acids. Selenium can serve as an excellent anomalous scattering center to solve the phase problem, which is one of the two major bottlenecks in macromolecule X-ray crystallography. The other major bottleneck is crystallization. It has been demonstrated that the incorporated selenium functionality at the 2'-positions of the nucleosides and nucleotides is stable and does not cause significant structure perturbation. Furthermore, it was observed that the 2'-Se-derivatization could facilitate crystallization of oligonucleotides with fast crystal growth and high diffraction quality. Herein, we describe a convenient synthesis of the 2'-Se-adenosine phosphoramidite, and report the first synthesis and X-ray crystal structure determination of the DNA containing the 2'-Se-A derivatization. The 3D structure of 2'-Se-A-DNA decamer [5'-GTACGCGT(2'-Se-A)C-3']{sub 2} was determined at 1.75 {angstrom} resolution, the 2'-Se-functionality points to the minor groove, and the Se-modified and native structures are virtually identical. Moreover, we have observed that the 2'-Se-A modification can greatly facilitate the crystal growth with high diffraction quality. In conjunction with the crystallization facilitation by the 2'-Se-U and 2'-Se-T, this novel observation on the 2'-Se-A functionality suggests that the 2'-Se moiety is sole responsible for the crystallization facilitation and the identity of nucleobases does not influence the crystal growth significantly.

Sheng, J.; Salon, J; Gan, J; Huang, Z

2010-01-01T23:59:59.000Z

89

Photovoltaic performance of ultra-small PbSe quantum dots  

E-Print Network [OSTI]

Y; Alivisatos, AP, Photovoltaic Devices Employing TernaryPhotovoltaic performance of ultra-small PbSe quantum dotsquantum dot, solar cell, photovoltaic, quantum size effect

Ma, Wanli

2014-01-01T23:59:59.000Z

90

Photovoltaic Devices Employing Ternary PbSxSe1-x Nanocrystals  

E-Print Network [OSTI]

Photovoltaic Devices Employing Ternary PbS x Se 1-xalloy nanoparticles. Photovoltaic devices made using ternaryInformation for Efficient Photovoltaic Devices Employing

Alivisatos, A. Paul

2009-01-01T23:59:59.000Z

91

SciTech Connect: A Solution for Solution-Produced [beta]-FeSe...  

Office of Scientific and Technical Information (OSTI)

A Solution for Solution-Produced beta-FeSe: Elucidating and Overcoming Factors that Prevent Superconductivity Citation Details In-Document Search Title: A Solution for...

92

Electrical Transport of Topological Insulator-Bi2Se3 and Thermoelectric Properties of Graphene  

E-Print Network [OSTI]

tapes are detached to exfoliate the crystal into thinnercan also be utilized to exfoliate Bi 2 Se 3 on top of SrTiO

WEI, PENG

2011-01-01T23:59:59.000Z

93

Mechanical and electronic-structure properties of compressed CdSe tetrapod nanocrystals  

E-Print Network [OSTI]

Mechanical and electronic-structure properties of compressed94720 USA The coupling of mechanical and optical propertiestheoretical examination of the mechanical properties of CdSe

Schrier, Joshua; Lee, Byounghak; Wang, Lin-Wang

2008-01-01T23:59:59.000Z

94

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

95

BOX 50005, SE-104 05 STOCKHOLM, SWEDEN, RECEPTION +46 8 673 95 00, FAX +46 8 15 56 70 BESK/VISIT: LILLA FRESCATIVGEN 4A, STOCKHOLM, INFO@KVA.SE HTTP://KVA.SE  

E-Print Network [OSTI]

BOX 50005, SE-104 05 STOCKHOLM, SWEDEN, RECEPTION +46 8 673 95 00, FAX +46 8 15 56 70 BESÃ?K by Patricia K. Kuhl, University of Washington, Seattle, WA, USA and Hon. Dr., Stockholm University, Sweden will be followed by a panel discussion including Hugo Lagercrantz, Karolinska Institutet, Solna, Sweden, Andrew

96

Ultrathin Topological Insulator Bi2Se3 Nanoribbons Exfoliated by Atomic Force  

E-Print Network [OSTI]

Ultrathin Topological Insulator Bi2Se3 Nanoribbons Exfoliated by Atomic Force Microscopy Seung Sae, Stanford University, Stanford, California 94305 ABSTRACT Ultrathin topological insulator nanostructures), the layered bismuth selenide (Bi2Se3), a single Dirac-cone topological insulator with a large bulk gap, can

Cui, Yi

97

Kandidatexjobb inom fysik Bjrn Cederstrm, bjorn@mi.physics.kth.se  

E-Print Network [OSTI]

Kandidatexjobb inom fysik VT 2014 Björn Cederström, bjorn@mi.physics.kth.se (avgående kontaktpersonGoLite project #12;Tack! Mer information: http://www.mi.physics.kth.se/web/teaching_kand_exjobb.htm 2013-09-25 12

Haviland, David

98

p-type Bi2Se3 for topological insulator and low temperature thermoelectric applications  

E-Print Network [OSTI]

end-members of the (Bi,Sb)2(Te,Se)3 family of thermoelectric materials. Decades of work-based thermoelectrics has been the difficulty in making the material p-type. Unlike Bi2Te3, which can1 p-type Bi2Se3 for topological insulator and low temperature thermoelectric applications Y.S. Hor1

Ong, N. P.

99

Hybrid Electrochromic Fluorescent Poly(DNTD)/CdSe@ZnS Composite Films  

E-Print Network [OSTI]

Hybrid Electrochromic Fluorescent Poly(DNTD)/CdSe@ZnS Composite Films Huige Wei, Xingru Yan, Springdale, Arkansas 72764, United States ABSTRACT: Hybrid electrochromic poly(DNTD)/CdSe@ZnS quantum dots of an electrical current after the application of an appropriate electrode potential.15-17 The electrochromic

Guo, John Zhanhu

100

Testing models for the Messinian salinity crisis: The Messinian record in Almera, SE Spain  

E-Print Network [OSTI]

Testing models for the Messinian salinity crisis: The Messinian record in Almería, SE Spain Juan C Fuentenueva s.n., Universidad de Granada, 18002 Granada, Spain b School of Earth, Ocean and Planetary Sciences, SE Spain, display excellent exposures of Messinian (Late Miocene) sequences. The Sorbas, Almería

Riding, Robert

Note: This page contains sample records for the topic "guatemala se mencionan" 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

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

E-Print Network [OSTI]

- grade their optical properties. In this paper, we report on the effects of gamma irradiationRapid degradation of CdSe/ZnS colloidal quantum dots exposed to gamma irradiation Nathan J. Withers of 137 Cs gamma irradiation on photoluminescent properties of CdSe/ZnS colloidal quantum dots

New Mexico, University of

102

Tunable White-Light-Emitting Mn-Doped ZnSe Nanocrystals Vijay Kumar Sharma,  

E-Print Network [OSTI]

Tunable White-Light-Emitting Mn-Doped ZnSe Nanocrystals Vijay Kumar Sharma, Burak Guzelturk, Talha report white-light-emitting Mn-doped ZnSe nanocrystals (NCs) that are synthesized using modified orange emission (580 nm), allowed us to achieve excitation wavelength tailorable white-light generation

Demir, Hilmi Volkan

103

Superconductivity in Strong Spin Orbital Coupling Compound Sb2Se3  

E-Print Network [OSTI]

Superconductivity in Strong Spin Orbital Coupling Compound Sb2Se3 P. P. Kong1 , F. Sun1,3 , L. Y induce Sb2Se3 into a topological nontrivial state. Here, we report on the discovery of superconductivity superconductive at high pressures above 10 GPa proceeded by a pressure induced insulator to metal like transition

Shen, Guoyin

104

Photovoltaic cells fabricated by electrophoretic deposition of CdSe nanocrystals  

E-Print Network [OSTI]

Photovoltaic cells fabricated by electrophoretic deposition of CdSe nanocrystals Nathanael J. Smith Electrophoretic deposition was used to deposit CdSe nanocrystals on TiO2 for use in photovoltaic cells formed. A solar cell constructed using electrophoretic deposition exhibited a photovoltaic response from

Smith, Nathanael J.

105

Development of a Low Cost Insulated Foil Substrate for Cu(InGaSe)2 Photovoltaics  

SciTech Connect (OSTI)

The project validated the use of stainless steel flexible substrate coated with silicone-based resin dielectric, developed by Dow Corning Corporation, for Cu(InGa)Se2 based photovoltaics. The projects driving force was the high performance of Cu(InGa)Se2 based photovoltaics coupled with potential cost reduction that could be achieved with dielectric coated SS web substrate.

ERTEN ESER

2012-01-22T23:59:59.000Z

106

Photoluminescence and Photoluminescence Excitation Spectroscopy of Cu(In,Ga)Se2 Thin Films  

E-Print Network [OSTI]

state with an ionization energy of ~16 meV is proposed to be a transition into band tail states rather resource concerns have spurred interest in renewable energy technologies, particularly in the area identified between defect spectra of CuInSe2 and CuGaSe2 ­ the transition energies are different

Rockett, Angus

107

Using SeDuMi 1.02, a MATLAB toolbox for optimization over symmetric cones  

E-Print Network [OSTI]

SeDuMi is an add-on for MATLAB, that lets you solve optimization problems with linear, quadratic and semidefiniteness constraints. It is possible to have complex valued data and variables in SeDuMi. Moreover, large scale optimization problems are solved efficiently, by exploiting sparsity. This paper describes how to work with this toolbox.

Jos F. Sturm

1998-01-01T23:59:59.000Z

108

SE HAN FINALIZADO LOS PREPARATIVOS PARA LA CONFERENCIA NACIONAL DE JUSTICIA MEDIOAMBIENTAL Y PROGRAMA DE FORMACIÓN 2013  

Broader source: Energy.gov [DOE]

La National Environmental Justice Conference, Inc. (Conferencia de Justicia Medioambiental) se prepara para otro exitoso acontecimiento, ya que se aproxima la Conferencia Nacional de Justicia...

109

Magnetic and electrical properties of layered magnets Tl(Cr,Mn,Co)Se{sub 2}  

SciTech Connect (OSTI)

Tl(Cr,Mn,Co)Se{sub 2} crystals were synthesized at T {approx} 1050 K. X-ray diffraction analysis showed that TlCrSe{sub 2}, TlMnSe{sub 2}, and TlCoSe{sub 2} compounds crystallize in the hexagonal crystal system with the lattice parameters: a = 3.6999 A, c = 22.6901 A, c/a {approx} 6.133, z = 3, {rho}{sub x} = 6.209 g/cm{sup 3}; a = 6.53 A, c = 23.96 A, c/a {approx} 3.669, z = 8, {rho}{sub x} = 6.71 g/cm{sup 3}; and a = 3.747 A, c = 22.772 A, c/a {approx} 6.077, z = 3, {rho}{sub x} = 7.577 g/cm{sup 3}, respectively. Magnetic and electrical studies in the temperature range from 80-400 K showed that TlCrSe{sub 2} is a semiconductor ferromagnet, TlMnSe{sub 2} is a semiconductor antiferromagnet, and TlCoSe{sub 2} is a ferrimagnet with a conductivity characteristic of metals. A rather large deviation in the experimental effective magnetic moment for TlCrSe{sub 2} (3.05 {mu}B) from the theoretical value (3.85 {mu}B) is attributed to two-dimensional magnetic ordering in the paramagnetic region of the noticeably layered ferromagnet TlCrSe{sub 2}. In TlCrSe{sub 2}, a correlation between magnetic and electrical properties was detected.

Veliyev, R. G.; Sadikhov, R. Z.; Kerimova, E. M., E-mail: ekerimova@physics.ab.az; Asadov, Yu. G.; Jabbarov, A. I. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2009-02-15T23:59:59.000Z

110

Phase equilibria in the quasi-ternary system Ag{sub 2}Se–Ga{sub 2}Se{sub 3}–In{sub 2}Se{sub 3} and physical properties of (Ga{sub 0.6}In{sub 0.4}){sub 2}Se{sub 3}, (Ga{sub 0.594}In{sub 0.396}Er{sub 0.01}){sub 2}Se{sub 3} single crystals  

SciTech Connect (OSTI)

The quasi-ternary system Ag{sub 2}Se–Ga{sub 2}Se{sub 3}–In{sub 2}Se{sub 3} was investigated by differential thermal, X-ray phase, X-ray structure, microstructure analysis and microhardness measurements. Five quasi-binary phase diagrams, six polythermal sections, isothermal section at 820 K and the liquidus surface projection were constructed. The character and temperature of the invariant processes were determined. The specific resistance of the single crystals (Ga{sub 0.6}In{sub 0.4}){sub 2}Se{sub 3}, (Ga{sub 0.594}In{sub 0.396}Er{sub 0.01}){sub 2}Se{sub 3} was measured, 7.5×10{sup 5} and 3.15×10{sup 5} ? m, respectively, optical absorption spectra in the 600–1050 nm range were recorded at room temperature, and the band gap energy was estimated which is 1.95±0. 01 eV for both samples. - Graphical abstract: The article reports for the first time the investigated liquidus surface projection of the Ag{sub 2}Se–Ga{sub 2}Se{sub 3}–In{sub 2}Se{sub 3} system and isothermal section at 820 K of the system. Five phase diagrams, six polythermal sections, isothermal section at 820 K and the liquidus surface projection were built at the first time. The existence of the large region of the solid solutions based on AgIn{sub 5}Se{sub 8}, Ga{sub 2}Se{sub 3} and AgGa{sub 1?x}In{sub x}Se{sub 2} was investigated. The existence of two ternary phases was established in the Ga{sub 2}Se{sub 3}–In{sub 2}Se{sub 3} system. Two single crystals (Ga{sub 0.6}In{sub 0.4}){sub 2}Se{sub 3}, (Ga{sub 0.594}In{sub 0.396}Er{sub 0.01}){sub 2}Se{sub 3} were grown and some of optical properties of them were studied at first time. Display Omitted - Highlights: • Liquidus surface projection was built for Ag{sub 2}Se–Ga{sub 2}Se{sub 3}–In{sub 2}Se{sub 3} system. • Solid solution ranges of AgIn{sub 5}Se{sub 8}, Ga{sub 2}Se{sub 3} and AgGa{sub 1?x}In{sub x}Se{sub 2} were investigated. • Two single crystals (Ga{sub 0.6}In{sub 0.4}){sub 2}Se{sub 3}, (Ga{sub 0.594}In{sub 0.396}Er{sub 0.01}){sub 2}Se{sub 3} were grown. • Some optical properties of these single crystals were studied.

Ivashchenko, I.A., E-mail: inna.ivashchenko@mail.ru [Department of Inorganic and Physical Chemistry, Eastern European National University, Voli Ave 13, Lutsk 43025 (Ukraine); Danyliuk, I.V.; Olekseyuk, I.D. [Department of Inorganic and Physical Chemistry, Eastern European National University, Voli Ave 13, Lutsk 43025 (Ukraine); Halyan, V.V. [Department of General Physics, Eastern European National University, Voli Ave 13, Lutsk 43025 (Ukraine)

2014-02-15T23:59:59.000Z

111

Hydrothermal synthesis, structure, and magnetic properties of Pu(SeO{sub 3}){sub 2}  

SciTech Connect (OSTI)

The reaction between PuO{sub 2} and SeO{sub 2} under mild hydrothermal conditions results in the formation of Pu(SeO{sub 3}){sub 2} as brick-red prisms. This compound adopts the Ce(SeO{sub 3}){sub 2} structure type, and consists of one-dimensional chains of edge-sharing [PuO{sub 8}] distorted bicapped trigonal prisms linked by [SeO{sub 3}] units into a three-dimensional network. Crystallographic data: Pu(SeO{sub 3}){sub 2}, monoclinic, space group P2{sub 1}/n, a=6.960(1) A, b=10.547(2) A, c=7.245(1) A, {beta}=106.880(9){sup o}, V=508.98(17) A{sup 3}, Z=4 (T=193 K), R(F)=2.92% for 83 parameters with 1140 reflections with I>2{sigma}(I). Magnetic susceptibility data for Pu(SeO{sub 3}){sub 2} are linear from 35 to 320 K and yield an effective moment of 2.71(5) {mu}{sub B} and a Weiss constant of -500(5) K. - Graphical abstract: A depiction of the three-dimensional structure of Pu(SeO{sub 3}){sub 2} formed from the interconnection of one-dimensional chains of edge-sharing PuO{sub 8} dodecahedra by selenite anions.

Bray, Travis H. [Department of Chemistry and Biochemistry and Center for Actinide Science, Auburn University, Auburn, AL 36849 (United States); Skanthakumar, S.; Soderholm, L. [Chemistry Division, Argonne National Laboratory, Argonne, IL 60439 (United States); Sykora, Richard E. [Department of Chemistry, University of South Alabama, Mobile, AL 36688 (United States); Haire, Richard G. [Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States); Albrecht-Schmitt, Thomas E. [Department of Chemistry and Biochemistry and Center for Actinide Science, Auburn University, Auburn, AL 36849 (United States)], E-mail: albreth@auburn.edu

2008-03-15T23:59:59.000Z

112

Diamond-machined ZnSe immersion grating for NIR high-resolution spectroscopy  

SciTech Connect (OSTI)

ZnSe immersion gratings (n {approx} 2.45) provide the possibility of high-resolution spectroscopy for the near-infrared (NIR) region. Since ZnSe has a lower internal attenuation than other NIR materials, it is most suitable for immersion grating, particularly in short NIR region (0.8-1.4 {micro}m). We are developing an extremely high-resolution spectrograph with {lambda}/{Delta}{lambda} = 100,000, WINERED, customized for the short NIR region, using ZnSe (or ZnS) immersion grating. However, it had been very difficult to make fine grooves on ZnSe substrate with a small pitch of less than 50 {micro}m because ZnSe is a soft/brittle material. We have overcome this problem and successfully machined sharp grooves with fine pitch on ZnSe substrates by nano precision fly-cutting technique at LLNL. The optical testing of the sample grating with HeNe laser shows an excellent performance: the relative efficiency more than 87.4 % at 0.633 {micro}m for a classical grating configuration. The diffraction efficiency when used as an immersion grating is estimated to be more than 65 % at 1 {micro}m. Following this progress, we are about to start machining a grating on a large ZnSe prism with an entrance aperture of 23mm x 50mm and the blaze angle of 70{sup o}.

Ikeda, Y; Kobayashi, N; Kuzmenko, P J; Little, S L; Yasui, C; Kondo, S; Minami, A; Motohara, K

2008-07-25T23:59:59.000Z

113

Characterization of ZnSe scintillating bolometers for Double Beta Decay  

E-Print Network [OSTI]

ZnSe scintillating bolometers are good candidates for future Double Beta Decay searches, because of the 82Se high Q-value and thanks to the possibility of alpha background rejection on the basis of the scintillation signal. In this paper we report the characteristics and the anomalies observed in an extensive study of these devices. Among them, an unexpected high emission from alpha particles, accompanied with an unusual pattern of the light vs. heat scatter plot. The perspectives for the application of this kind of detectors to search for the Neutrinoless Double Beta Decay of 82Se are presented.

C. Arnaboldi; S. Capelli; O. Cremonesi; L. Gironi; M. Pavan; G. Pessina; S. Pirro

2010-06-30T23:59:59.000Z

114

Optimal packing size of non-ligated CdSe nanoclusters for microstructure synthesis  

SciTech Connect (OSTI)

Structural and electrostatic properties of nanoclusters of CdSe of diameter 1–2?nm are studied with first principle calculations to determine the optimal size for synthesizing microstructures. Based on robustness of the core structure, i.e., the retention of tetrahedral geometry, hexagonal ring structure, and overall wu{sup ¨}rtzite structure to surface relaxations, we conclude that nanoclusters of ?2?nm diameter are the best candidates to form a dense microstructure with minimal interstitial space. Se-terminated surfaces retain a zigzag structure as Se atoms are pulled out and Cd atoms are pulled in due to relaxation, therefore, are best suited for inter-nanocluster formations.

Tefera, Anteneh G.; Mochena, Mogus D. [Department of Physics, Florida A and M University, Tallahassee, Florida 32307 (United States); Johnson, Elijah [School of Environment, Florida A and M University, Tallahassee, Florida 32307 (United States); Dickerson, James [Department of Physics, Brown University, Providence, Rhode Island 02912 (United States)

2014-09-14T23:59:59.000Z

115

Electrical Transport of Topological Insulator-Bi2Se3 and Thermoelectric Properties of Graphene  

E-Print Network [OSTI]

Hall effect and topological insulators. Phys Today Klitzing,L. & Mele, E. J. Topological insulators in three dimensions.Zhang, H. J. et al. Topological insulators in Bi 2 Se 3 , Bi

WEI, PENG

2011-01-01T23:59:59.000Z

116

Polarization dependent photocurrents in thin films of the topological insulator Bi?Se?  

E-Print Network [OSTI]

Topological insulators are a new class of three-dimensional quantum materials whose interior or bulk is an insulator but whose surface is a conductor. Bi?Se? is a prototypical topological insulator that physicists at MIT ...

Lau, Claudia (Claudia M.)

2012-01-01T23:59:59.000Z

117

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

118

Structure, Magnetism, and Transport of CuCr2Se4 Thin Films  

E-Print Network [OSTI]

Structure, Magnetism, and Transport of CuCr 2 Se 4 Thindichroism shows that the magnetism persists to the surfacesuch as the nature of magnetism at surfaces and interfaces.

2008-01-01T23:59:59.000Z

119

Thermoelectric properties of polycrystalline In4Se3 and In4Te3  

SciTech Connect (OSTI)

High thermoelectric performance of a single crystal layered compound In{sub 4}Se{sub 3} was reported recently. We present here an electrical and thermal transport property study over a wide temperature range for polycrystalline samples of In{sub 4}Se{sub 3} and In{sub 4}Te{sub 3}. Our data demonstrate that these materials are lightly doped semiconductors, leading to large thermopower and resistivity. Very low thermal conductivity, below 1 W/m K, is observed. The power factors for In{sub 4}Se{sub 3} and In{sub 4}Te{sub 3} are much smaller when compared with state-of-the-art thermoelectric materials. This combined with the very low thermal conductivity results in the maximum ZT value of less than 0.6 at 700 K for In{sub 4}Se{sub 3}.

Shi, Xun [Optimal Inc., Plymouth, Michigan 48170, USA; Cho, Jung Y [GM R& D and Planning, Warren, Michigan; Salvador, James R. [GM R& D and Planning, Warren, Michigan; Yang, Jihui [General Motors Corporation-R& D; Wang, Hsin [Oak Ridge National Laboratory (ORNL)

2010-01-01T23:59:59.000Z

120

Surface State Transport and Ambipolar Electric Field Effect in Bi2Se3 Nanodevices  

E-Print Network [OSTI]

Electronic transport experiments involving the topologically protected states found at the surface of Bi[subscript 2]Se[subscript 3] and other topological insulators require fine control over carrier density, which is ...

Steinberg, Hadar

Note: This page contains sample records for the topic "guatemala se mencionan" 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

Donor bound excitons in ZnSe nanoresonators - Applications in quantum information science  

SciTech Connect (OSTI)

Here we summarize the advantages of excitons bound to isolated fluorine donor in ZnSe/ZnMgSe quantum well nano-structures. Devices based on these semiconductors, are particularly suited to implement concepts of the optical manipulation of quantum states in solid-state material. The fluorine donor in ZnSe provides a physical qubit with potential advantages over previously researched qubits. In this context we show several initial demonstrations of devices, such as a low-threshold microdisk laser and an indistinguishable single photon source. Additionally we demonstrate the realization of a controllable three-level-system qubit consisting of a single Fluorine donor in a ZnSe nano-pillar, which provides an optical accessible single electon spin qubit.

Pawlis, A. [Department of Physics, University of Paderborn, Warburger Str. 100, 33098 Paderborn, Germany and Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305-4088 (United States); Lischka, K. [Department of Physics, University of Paderborn, Warburger Str. 100, 33098 Paderborn (Germany); Sanaka, K.; Yamamoto, Y. [Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305-4088, USA and National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430 (Japan); Sleiter, D. [Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305-4088 (United States)

2014-05-15T23:59:59.000Z

122

User's Guide for SeDuMi Interface 1.01: Solving LMI problems with ...  

E-Print Network [OSTI]

Nov 2, 2001 ... particular, a major di culty is that control problems are formulated ... these potentialities will be integrated to SeDuMi Interface in the future, depending on ...... improve this document and make some publicity for your results.

2001-11-02T23:59:59.000Z

123

Interband and intraband optical studies of CdSe colloidal nanocrystal films  

E-Print Network [OSTI]

We present results for optical measurements on charged CdSe nanocrystals. The injection of electrons into quantum confined states is confirmed by monitoring changes in the visible and infrared absorption spectra. Interestingly, ...

Toyama, Fumiaki, 1977-

2004-01-01T23:59:59.000Z

124

Enhanced Thermoelectric Power and Electronic Correlations in RuSe2  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

We report the electronic structure, electric and thermal transport properties of Ru1-xIrxSe2 (x ? 0:2). RuSe2 is a semiconductor that crystallizes in a cubic pyrite unit cell. The Seebeck coefficient of RuSe2 exceeds -200 ?#22;V/K around 730 K. Ir substitution results in the suppression of the resistivity and the Seebeck coefficient, suggesting the removal of the peaks in density of states near the Fermi level. Ru0.8Ir0.2Se2 shows a semiconductor-metal crossover at about 30 K. The magnetic field restores the semiconducting behavior. Our results indicate the importance of the electronic correlations in enhanced thermoelectricity of RuSb2.

Wang, Kefeng [Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Wang, Aifeng [Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Tomic, A. [Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Wang, Limin [Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Abeykoon, A.M. Milinda [Brookhaven National Laboratory (BNL), Upton, NY (United States). Photon Sciences Directorate; Dooryhee, E. [Brookhaven National Laboratory (BNL), Upton, NY (United States). Photon Sciences Directorate; Billinge, S. J.L. [Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Columbia Univ., New York, NY (United States); Petrovic, C. [Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.

2015-04-01T23:59:59.000Z

125

Nanofabrication, Plasmon Enhanced Fluorescence and Photo-oxidation Kinetics of CdSe Nanoparticles  

E-Print Network [OSTI]

nanosphere (left) and nanoprism (right) solutions and (B) their corresponding absorption spectra displayed in yellow and green line, respectively. (C) TEM image of photoinduced Ag nanoprisms. The inserts show the electron diffraction analysis... this synthetic method, typical commercial CdSe nanocrystals have a size deviation less than 10% and narrow emission spectra with peak widths at half height of around 30- 50 nm for small ones that have 4 nm in diameter. The color changes of the CdSe quantum...

Chen, Jixin

2011-08-08T23:59:59.000Z

126

Electron transfer and capture dynamics in ZnSe quantum wells grown on GaAs  

SciTech Connect (OSTI)

We investigate the transfer and capture dynamics of electrons in phase coherent photorefractive ZnSe quantum wells grown on GaAs using degenerate three-beam four-wave-mixing. The measurements reveal electron capture times by the quantum well in the order of several tens of picoseconds and a transit time of approximately 5 picoseconds from the GaAs substrate through the ZnMgSe barrier.

Dongol, A.; Wagner, H. P. [Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221 (United States)

2013-12-04T23:59:59.000Z

127

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

128

Unique Challenges Accompany Thick-Shell CdSe/nCdS (n > 10) Nanocrystal Synthesis  

SciTech Connect (OSTI)

Thick-shell CdSe/nCdS (n {ge} 10) nanocrystals were recently reported that show remarkably suppressed fluorescence intermittency or 'blinking' at the single-particle level as well as slow rates of Auger decay. Unfortunately, whereas CdSe/nCdS nanocrystal synthesis is well-developed up to n {le} 6 CdS monolayers (MLs), reproducible syntheses for n {ge} 10 MLs are less understood. Known procedures sometimes result in homogeneous CdS nucleation instead of heterogeneous, epitaxial CdS nucleation on CdSe, leading to broad and multimodal particle size distributions. Critically, obtained core/shell sizes are often below those desired. This article describes synthetic conditions specific to thick-shell growth (n {ge} 10 and n {ge} 20 MLs) on both small (sub2 nm) and large (>4.5 nm) CdSe cores. We find added secondary amine and low concentration of CdSe cores and molecular precursors give desired core/shell sizes. Amine-induced, partial etching of CdSe cores results in apparent shell-thicknesses slightly beyond those desired, especially for very-thick shells (n {ge} 20 MLs). Thermal ripening and fast precursor injection lead to undesired homogeneous CdS nucleation and incomplete shell growth. Core/shells derived from small CdSe (1.9 nm) have longer PL lifetimes and more pronounced blinking at single-particle level compared with those derived from large CdSe (4.7 nm). We expect our new synthetic approach will lead to a larger throughput of these materials, increasing their availability for fundamental studies and applications.

Guo, Y; Marchuk, K; Abraham, R; Sampat, S; Abraham, R.; Fang, N; Malko, AV; Vela, J

2011-12-23T23:59:59.000Z

129

A comparative transport study of Bi{sub 2}Se{sub 3} and Bi{sub 2}Se{sub 3}/yttrium iron garnet  

SciTech Connect (OSTI)

Bilayers of 20 quintuple layer Bi{sub 2}Se{sub 3} on 30?nm thick yttrium iron garnet (YIG) have been grown with molecular beam epitaxy in conjunction with pulsed laser deposition. The presence of the ferri-magnetic insulator YIG causes additional scattering to the surface states of the Bi{sub 2}Se{sub 3} topological insulator layer, as indicated by the temperature dependence of the resistivity. From the two-channel analysis of the Hall data, we find that the surface contribution in the bilayer samples is greatly reduced. Furthermore, the weak antilocalization effect from the surface states is clearly suppressed due to the presence of the YIG layer.

Jiang, Zilong; Tang, Chi; Shi, Jing [Department of Physics and Astronomy, University of California, Riverside, California 92521 (United States); Katmis, Ferhat; Wei, Peng; Moodera, Jagadeesh S. [Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2014-06-02T23:59:59.000Z

130

Native defects in tetradymite Bi2(TexSe3-x) topological insulators  

SciTech Connect (OSTI)

Formation energies of native defects in Bi2(TexSe3-x), with comparison to ideal Bi2Te2S, are calculated in density-functional theory to assess transport properties. Bi2Se3 is found to be n type for both Bi- and Se-rich growth conditions, while Bi2Te3 changes from n to p type going from Te- to Bi-rich conditions, as observed. Bi2Te2Se and Bi2Te2S are generally n type, explaining observed heavily doped n-type behavior in most samples. A (0/-) transition level at 16 meV above valence-band maximum for Bi on Te antisites in Bi2Te2Se is related to the observed thermally active transport gap causing a p-to-n transition at low temperature. Bi2(TexSe3-x) with x>2 are predicted to have high bulk resistivity due to effective carrier compensation when approaching the n-to-p crossover. Predicted behaviors are confirmed from characterization of our grown single crystals.

Wang, Lin-Lin [Ames Laboratory; Huang, Mianliang [South Dakota School of Mines; Thimmaiah, Srinivasa [Ames Laboratory; Alam, Aftab [Ames Laboratory; Budko, Sergey L. [Ames Laboratory; Kaminski, Adam [Ames Laboratory; Lograsso, Thomas A. [Ames Laboratory; Canfield, Paul [Ames Laboratory; Johnson, Duane D. [Ames Laboratory

2013-03-08T23:59:59.000Z

131

Hidden Superlattice in Tl2(SC6H4S) and Tl2(SeC6H4Se) Solved from Powder X-ray Diffraction  

SciTech Connect (OSTI)

The crystal structures of the isostructural title compounds poly[({mu}-benzene-1,4-dithiolato)dithallium], Tl{sub 2}(SC{sub 6}H{sub 4}S), and poly[({mu}-benzene-1,4-diselenolato)dithallium], Tl{sub 2}(SeC{sub 6}H{sub 4}Se), were solved by simulated annealing from high-resolution synchrotron X-ray powder diffraction. Rietveld refinements of an initial structure with one formula unit per triclinic cell gave satisfactory agreement with the data, but led to a structure with impossibly close non-bonded contacts. A disordered model was proposed to alleviate this problem, but an alternative supercell structure leads to slightly improved agreement with the data. The isostructural superlattice structures were confirmed for both compounds through additional data collection, with substantially better counting statistics, which revealed the presence of very weak superlattice peaks not previously seen. Overall, each structure contains Tl-S or Tl-Se two-dimensional networks, connected by phenylene bridges. The sulfur (or selenium) coordination sphere around each thallium is a highly distorted square pyramid or a 'see-saw' shape, depending upon how many Tl-S or Tl-Se interactions are considered to be bonds. In addition, the two compounds contain pairs of Tl{sup I} ions that interact through a closed-shell 'thallophilic' interaction: in the sulfur compound there are two inequivalent pairs of Tl atoms with Tl-Tl distances of 3.49 and 3.58 {angstrom}, while in the selenium compound those Tl-Tl interactions are at 3.54 and 3.63 {angstrom}.

K Stone; D Turner; M Singh; T Vaid; P Stephens

2011-12-31T23:59:59.000Z

132

Recrystallization method to selenization of thin-film Cu(In,Ga)Se.sub.2 for semiconductor device applications  

DOE Patents [OSTI]

A process for fabricating slightly Cu-poor thin-films of Cu(In,Ga)Se.sub.2 on a substrate for semiconductor device applications includes the steps of forming initially a slightly Cu-rich, phase separated, mixture of Cu(In,Ga)Se.sub.2 :Cu.sub.x Se on the substrate in solid form followed by exposure of the Cu(In,Ga)Se.sub.2 :Cu.sub.x Se solid mixture to an overpressure of Se vapor and (In,Ga) vapor for deposition on the Cu(In,Ga)Se.sub.2 :Cu.sub.x Se solid mixture while simultaneously increasing the temperature of the solid mixture toward a recrystallization temperature (about 550.degree. C.) at which Cu(In,Ga)Se.sub.2 is solid and Cu.sub.x Se is liquid. The (In,Ga) flux is terminated while the Se overpressure flux and the recrystallization temperature are maintained to recrystallize the Cu.sub.x Se with the (In, Ga) that was deposited during the temperature transition and with the Se vapor to form the thin-film of slightly Cu-poor Cu.sub.x (In,Ga).sub.y Se.sub.z. The initial Cu-rich, phase separated large grain mixture of Cu(In,Ga)Se.sub.2 :Cu.sub.x Se can be made by sequentially depositing or co-depositing the metal precursors, Cu and (In, Ga), on the substrate at room temperature, ramping up the thin-film temperature in the presence of Se overpressure to a moderate anneal temperature (about 450.degree. C.) and holding that temperature and the Se overpressure for an annealing period. A nonselenizing, low temperature anneal at about 100.degree. C. can also be used to homogenize the precursors on the substrates before the selenizing, moderate temperature anneal.

Albin, David S. (Denver, CO); Carapella, Jeffrey J. (Evergreen, CO); Tuttle, John R. (Denver, CO); Contreras, Miguel A. (Golden, CO); Gabor, Andrew M. (Boulder, CO); Noufi, Rommel (Golden, CO); Tennant, Andrew L. (Denver, CO)

1995-07-25T23:59:59.000Z

133

Novel Approaches to Wide Bandgap CuInSe2 Based Absorbers  

SciTech Connect (OSTI)

This project targeted the development of high performance wide bandgap solar cells based on thin film alloys of CuInSe2 to relax constraints on module design and enable tandem solar cell structures. This addressed goals of the Solar Energy Technologies Program for Next Generation PV to develop technology needed for higher thin film module efficiency as a means to reduce costs. Specific objectives of the research project were: 1) to develop the processes and materials required to improve the performance of wide bandgap thin film solar cells based on alloys of CuInSe2, and 2) to provide the fundamental science and engineering basis for the material, electronic, and device properties required to effectively apply these processes and materials to commercial manufacture. CuInSe2-based photovoltaics have established the highest efficiencies of the thin film materials at both the cell and module scales and are actively being scaled up to commercialization. In the highest efficiency cells and modules, the optical bandgap, a function of the CuInSe2-based alloy composition, is relatively low compared to the optimum match to the solar spectrum. Wider bandgap alloys of CuInSe2 produce higher cell voltages which can improve module performance and enable the development of tandem solar cells to boost the overall efficiency. A focus for the project was alloying with silver to form (AgCu)(InGa)Se2 pentenary thin films deposited by elemental co-evaporation which gives the broadest range of control of composition and material properties. This alloy has a lower melting temperature than Ag-free, Cu-based chalcopyrite compounds, which may enable films to be formed with lower defect densities and the (AgCu)(InGa)Se2 films give improved material properties and better device performance with increasing bandgap. A comprehensive characterization of optical, structural, and electronic properties of (AgCu)(InGa)Se2 was completed over the complete compositional range 0 ? Ga/(In+Ga) ? 1 and 0 ? Ag/(Ag+Cu) ? 1. Evidence of improved material quality includes reduced sub-bandgap optical absorption, sharper bandtails, and increased grain size with Ag addition. The Ag alloying was shown to increase the range of bandgaps over which solar cells can be fabricated without any drop-off in performance. With bandgap greater than 1.6 eV, in the range needed for tandem solar cells, (AgCu)(InGa)Se2 gave higher efficiency than other CuInSe2-based alloys. Using a simple single-stage co-evaporation process, a solar cell with 17.6% efficiency using a film with bandgap = 1.3 eV was achieved, demonstrating the viability of (AgCu)(InGa)Se2 for high efficiency devices. With a three-stage co-evaporation process for (AgCu)(InGa)Se2 deposition a device with efficiency = 13.0 % and VOC = 890 mV with JSC = 20.5 mA/cm2, FF = 71.3% was achieved. This surpasses the performance of other wide bandgap CuInSe2-based solar cells. Detailed characterization of the electronic properties of the materials and devices including the application of advanced admittance-based easements was completed.

William N. Shafarman

2011-04-28T23:59:59.000Z

134

Absorption and spectra of optical parameters in amorphous solid solutions of the Se-S system  

SciTech Connect (OSTI)

A study of the optical properties of the Se-S system has revealed a correlation between the dependences of optical absorption coefficient {alpha}, effective concentration of charged defects N{sub t}, and characteristic energy E{sub 0} corresponding to the Urbach optical absorption in the spectral region where the Urbach rule works for the Se-S system on the S concentration. These optical properties are controlled by charged defects. It is shown that concentrations of intrinsic charged defects can be changed by variation in composition of the Se-S system. Reflectance spectra of amorphous solid solutions of the Se-S system are studied within the energy range 1-6 eV. Using the Kramers-Kronig method, spectral dependences of optical constants and derivative optical and dielectric functions are calculated. Variation in the spectra of optical parameters with composition of the Se-S system are explained within a cluster model in which the density of electron states is a function of atomic configurations in clusters, i.e., of the character of a short-range order.

Djalilov, N. Z.; Damirov, G. M., E-mail: gafil@phytsics.ab.az [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2011-04-15T23:59:59.000Z

135

Method of fabricating high-efficiency Cu(In,Ga)(Se,S){sub 2} thin films for solar cells  

DOE Patents [OSTI]

A process for producing a slightly Cu-poor thin film of Cu(In,Ga)(Se,S){sub 2} comprises depositing a first layer of (In,Ga){sub x} (Se,S){sub y} followed by depositing just enough Cu+(Se,S) or Cu{sub x} (Se,S) to produce the desired slightly Cu-poor material. In a variation, most, but not all, (about 90 to 99%) of the (In,Ga){sub x} (Se,S){sub y} is deposited first, followed by deposition of all the Cu+(Se,S) or Cu{sub x} (Se,S) to go near stoichiometric, possibly or even preferably slightly Cu-rich, and then in turn followed by deposition of the remainder (about 1 to 10%) of the (In,Ga){sub x} (Se,S){sub y} to end with a slightly Cu-poor composition. In yet another variation, a small portion (about 1 to 10%) of the (In,Ga){sub x} (Se,S){sub y} is first deposited as a seed layer, followed by deposition of all of the Cu+(Se,S) or Cu{sub x} (Se,S) to make a very Cu-rich mixture, and then followed deposition of the remainder of the (In,Ga){sub x} (Se,S){sub y} to go slightly Cu-poor in the final Cu(In,Ga)(Se,S){sub 2} thin film. 5 figs.

Noufi, R.; Gabor, A.M.; Tuttle, J.R.; Tennant, A.L.; Contreras, M.A.; Albin, D.S.; Carapella, J.J.

1995-08-15T23:59:59.000Z

136

Method of fabricating high-efficiency Cu(In,Ga)(SeS).sub.2 thin films for solar cells  

DOE Patents [OSTI]

A process for producing a slightly Cu-poor thin film of Cu(In,Ga)(Se,S).sub.2 comprises depositing a first layer of (In,Ga).sub.x (Se,S).sub.y followed by depositing just enough Cu+(Se,S) or Cu.sub.x (Se,S) to produce the desired slightly Cu-poor material. In a variation, most, but not all, (about 90 to 99%) of the (In,Ga).sub.x (Se,S).sub.y is deposited first, followed by deposition of all the Cu+(Se,S) or Cu.sub.x (Se,S) to go near stoichiometric, possibly or even preferably slightly Cu-rich, and then in turn followed by deposition of the remainder (about 1 to 10%) of the (In,Ga).sub.x (Se,S).sub.y to end with a slightly Cu-poor composition. In yet another variation, a small portion (about 1 to 10%) of the (In,Ga).sub.x (Se,S).sub.y is first deposited as a seed layer, followed by deposition of all of the Cu+(Se,S) or Cu.sub.x (Se,S) to make a very Cu-rich mixture, and then followed deposition of the remainder of the (In,Ga).sub.x (Se,S).sub.y to go slightly Cu-poor in the final Cu(In,Ga)(Se,S).sub.2 thin film.

Noufi, Rommel (Golden, CO); Gabor, Andrew M. (Boulder, CO); Tuttle, John R. (Denver, CO); Tennant, Andrew L. (Denver, CO); Contreras, Miguel A. (Golden, CO); Albin, David S. (Denver, CO); Carapella, Jeffrey J. (Evergreen, CO)

1995-01-01T23:59:59.000Z

137

Supplemental Figure 1. Root lengths of S. pinnata and S. albescens grown on vertically placed agar plates after 30 days of growth from germination. Plants treated without () Se (open bars) and with (+) 20 M SeO4  

E-Print Network [OSTI]

) and with (+) 20 M SeO4 2- (gray bars). Data represent the average of 4-5 different plants ± SE. P-values using and S. albescens grown with or without 20 M SeO4 2- . The only significant difference between treatments. pinnata when compared with S. albescens grown with and without 20 M SeO4 2- . #12;Supplemental Figure 4

138

Assessment of the SE2-ANL code using EBR-II temperature measurements  

SciTech Connect (OSTI)

The SE2-ANL code is a modified version of the SUPERENERGY-2 code [1]. This code is used at Argonne National Laboratory (ANL) to compute the core-wide temperature profiles in Liquid Metal Reactor (LMR) cores. The accuracy of this code has recently been tested by comparing the predicted temperatures with measured values in the Experimental Breeder Reactor R (EBR-II). The detailed temperature distributions in two experimental subassemblies and the mixed mean subassembly outlet temperatures were used in this validation study. The SE2-ANL predictions were found to agree well with measured values. It was also found that SE2-ANL yields results with accuracy comparable to the more detailed COBRA-WC [2] calculations at much lower computational cost.

Yang, W.S.; Yacout, A.M.

1995-01-01T23:59:59.000Z

139

Thermodynamic Model for the Solubility of Ba(SeO4, SO4) Precipitates  

SciTech Connect (OSTI)

Abstract: The solubility of Ba(SeO4, SO4) precipitates was determined as a function of the BaSeO4 mole fractions, ranging from 0.0015 to 0.3830, and time with an equilibration period extending to as long as 302 days. Equilibrium/steady state conditions in this system are reached in ? 65 days. Pitzer’s ion interaction model was used to calculate solid and aqueous phase activity coefficients. Thermodynamic analyses showed that the data do not satisfy Gibbs-Duhem equation, thereby demonstrating that a single-solid solution phase does not control both the selenate and sulfate concentrations. Our extensive data with log 10 [Ba] ranging from ?3.6 to ?5.9 mol kg?1, log 10 [SeO4] rangingfrom?3.6 to -5.2 mol kg?1, and log 10 [SO4] ranging from?4.0 to ?5.3 mol kg?1 can be explained with the formation of an ideal BaSeO4 solid solution phase that controls the selenium concentrations and a slightly disordered/less-crystalline BaSO4(s) (log 10𝐾?sp = ?9.5 instead of ?10.05 for barite) that controls the sulfate concentrations. In these experiments the BaSO4 component of the solid solution phase never reaches thermodynamic equilibrium with the aqueous phase. Thermodynamic interpretations of the data show that both the ideal BaSeO4 solid solution phase and less-crystalline BaSO4 (s) phase are in equilibrium with each other in the entire range of BaSeO 4 mole fractions investigated in this study.

Rai, D.; Felmy, Andrew R.; Moore, Dean A.; Kitamura, Akira; Yoshikawa, Hideki; Doi, Reisuke; Yoshida, Yasushi

2014-08-15T23:59:59.000Z

140

Investigations of CuInSe sub 2 thin films and contacts  

SciTech Connect (OSTI)

This report describes research into electrical contacts for copper indium diselenide (CuInSe{sub 2}) polycrystalline thin films used for solar cell applications. Molybdenum contacts have historically been the most promising for heterojunction solar cells. This program studied contact stability by investigating thermally induced bilayer reactions between molybdenum and copper, indium, and selenium. Because selenization is widely used to fabricate CuInSe{sub 2} thin films for photovoltaic cells, a second part of the program investigated how the morphologies, phases, and reactions of pre-selenization Cu-In structures are affected by the deposition process and heat treatments. 7 refs., 6 figs.

Nicolet, M.A. (California Inst. of Tech., Pasadena, CA (United States))

1991-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" from the National Library of EnergyBeta (NLEBeta).
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141

Ann bay lodyans 2 / se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network [OSTI]

KU ScholarWorks | http://kuscholarworks.ku.edu Ann Bay Lodyans 2 se Bryant Freeman (“Tonton Liben”) ki pare ti liv sa a 2000 by Bryant C. Freeman, ed. This work has been made available by the University of Kansas Libraries’ Office of Scholarly... Communication and Copyright. Please share your stories about how Open Access to this article benefits you. This is the published version of the book, made available with the permission of the publisher. Freeman, Bryant C., ed. Ann bay lodyans 2 / se Bryant...

Freeman, Bryant C.

2000-01-01T23:59:59.000Z

142

Ann bay lodyans 5 / se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network [OSTI]

KU ScholarWorks | http://kuscholarworks.ku.edu Ann Bay Lodyans 5 se Bryant Freeman (“Tonton Liben”) ki pare ti liv sa a 2000 by Bryant C. Freeman, ed. This work has been made available by the University of Kansas Libraries’ Office of Scholarly... Communication and Copyright. Please share your stories about how Open Access to this article benefits you. This is the published version of the book, made available with the permission of the publisher. Freeman, Bryant C., ed. Ann bay lodyans 5 / se Bryant...

Freeman, Bryant C.

2000-01-01T23:59:59.000Z

143

Ann bay lodyans 15 / Se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network [OSTI]

KU ScholarWorks | http://kuscholarworks.ku.edu Ann Bay Lodyans 15 se Bryant Freeman (“Tonton Liben”) ki pare ti liv sa a 2000 by Bryant C. Freeman, ed. This work has been made available by the University of Kansas Libraries’ Office of Scholarly... Communication and Copyright. Please share your stories about how Open Access to this article benefits you. This is the published version of the book, made available with the permission of the publisher. Freeman, Bryant C., ed. Ann bay lodyans 15 / se Bryant...

Freeman, Bryant C.

2000-01-01T23:59:59.000Z

144

Ann bay lodyans 6 / se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network [OSTI]

KU ScholarWorks | http://kuscholarworks.ku.edu Ann Bay Lodyans 6 se Bryant Freeman (“Tonton Liben”) ki pare ti liv sa a 2000 by Bryant C. Freeman, ed. This work has been made available by the University of Kansas Libraries’ Office of Scholarly... Communication and Copyright. Please share your stories about how Open Access to this article benefits you. This is the published version of the book, made available with the permission of the publisher. Freeman, Bryant C., ed. Ann bay lodyans 6 / se Bryant...

Freeman, Bryant C.

2000-01-01T23:59:59.000Z

145

Ann bay lodyans 3 / se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network [OSTI]

KU ScholarWorks | http://kuscholarworks.ku.edu Ann Bay Lodyans 3 se Bryant Freeman (“Tonton Liben”) ki pare ti liv sa a 2000 by Bryant C. Freeman, ed. This work has been made available by the University of Kansas Libraries’ Office of Scholarly... Communication and Copyright. Please share your stories about how Open Access to this article benefits you. This is the published version of the book, made available with the permission of the publisher. Freeman, Bryant C., ed. Ann bay lodyans 3 / se Bryant...

Freeman, Bryant C.

2000-01-01T23:59:59.000Z

146

Ann bay lodyans 16 / Se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network [OSTI]

KU ScholarWorks | http://kuscholarworks.ku.edu Ann Bay Lodyans 16 se Bryant Freeman (“Tonton Liben”) ki pare ti liv sa a 2000 by Bryant C. Freeman, ed. This work has been made available by the University of Kansas Libraries’ Office of Scholarly... Communication and Copyright. Please share your stories about how Open Access to this article benefits you. This is the published version of the book, made available with the permission of the publisher. Freeman, Bryant C., ed. Ann bay lodyans 16 / se Bryant...

Freeman, Bryant C.

2000-01-01T23:59:59.000Z

147

Ann bay lodyans 1 / se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network [OSTI]

KU ScholarWorks | http://kuscholarworks.ku.edu Ann Bay Lodyans 1 se Bryant Freeman (“Tonton Liben”) ki pare ti liv sa a 2000 by Bryant C. Freeman, ed. This work has been made available by the University of Kansas Libraries’ Office of Scholarly... Communication and Copyright. Please share your stories about how Open Access to this article benefits you. This is the published version of the book, made available with the permission of the publisher. Freeman, Bryant C., ed. Ann bay lodyans / se Bryant...

Freeman, Bryant C.

2000-01-01T23:59:59.000Z

148

Pair correlations in nuclei involved in neutrinoless double beta decay: 76Ge and 76Se  

E-Print Network [OSTI]

Precision measurements were carried out to test the similarities between the ground states of 76Ge and 76Se. The extent to which these two nuclei can be characterized as consisting of correlated pairs of neutrons in a BCS-like ground state was studied. The pair removal (p,t) reaction was measured at the far forward angle of 3 degrees. The relative cross sections are consistent (at the 5% level) with the description of these nuclei in terms of a correlated pairing state outside the N=28 closed shells with no pairing vibrations. Data were also obtained for 74Ge and 78Se.

S. J. Freeman; J. P. Schiffer; A. C. C. Villari; J. A. Clark; C. Deibel; S. Gros; A. Heinz; D. Hirata; C. L. Jiang; B. P. Kay; A. Parikh; P. D. Parker; J. Qian; K. E. Rehm; X. D. Tang; V. Werner; C. Wrede

2007-03-23T23:59:59.000Z

149

Formation of phases in the films of a Ag-In-Se system  

SciTech Connect (OSTI)

Processes of electron-diffraction structure analysis have been used to study the processes of phase formation and phase transitions in thin layers of a Ag-In-Se system. The phases formed at the onset of interaction between the films and phase transformations occurring during annealing of the samples in vacuum are established. It is found that thin films of the AgInSe{sub 2} compound formed as a result of simultaneous or consecutive deposition of components are amorphous, and crystallization brings about the formation of textured films with high structural quality

Ismayilov, D. I.; Kerimova, N. K., E-mail: kerimova-nurlana@mail.ru [Azerbaijan National Academy of Sciences, Institute of Physics (Azerbaijan)

2009-09-15T23:59:59.000Z

150

Ann bay lodyans 8 / se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network [OSTI]

dlo." Eklid Etyen, Teryewouj 1 2 TI GOUT TI GOUT, KONPE CHAT PEDI Yon jou diskisyon mete pye ant konpe Chen ak konpe Chat. Te gen yon moso vyann ate a. Konpe Chen di se li menm ki te we I anvan, men konpe Chat di se li menm ki te we I anvan... mak sonje. Konsa, Chat ale kay yon boko. Li di: "Papa, m vin lakay ou pou touye tout chen ki gen sou late. M ap peye ou mezi ou vie pou sa." Boko a reponn: "A monche, m ap ba ou sa sou de chez. Eske ou ka jwenn yon ti gout pipi chen?" Konpe Chat...

Freeman, Bryant C.

2000-01-01T23:59:59.000Z

151

Optically pumped quantum-dot Cd(Zn)Se/ZnSe laser and microchip converter for yellow-green spectral region  

SciTech Connect (OSTI)

The room temperature laser generation in the yellow-green ({lambda} = 558.5-566.7 nm) spectral range has been demonstrated under optical pumping by a pulsed nitrogen laser of Cd(Zn)Se/ZnSe quantum dot heterostructures. The maximum achieved laser wavelength was as high as {lambda} = 566.7 nm at a laser cavity length of 945 {mu}m. High values of both the output pulsed power (up to 50 W) and the external differential quantum efficiency ({approx}60%) were obtained at a cavity length of 435 {mu}m. Both a high quality of the laser heterostructure and a low lasing threshold ({approx}2 kW cm{sup -2}) make it possible to use a pulsed InGaN laser diode as a pump source. A laser microchip converter based on this heterostructure has demonstrated a maximum output pulse power of {approx}90 mW at {lambda} = 560 nm. The microchip converter was placed in a standard TO-18 (5.6 mm in diameter) laser diode package. (semiconductor lasers. physics and technology)

Lutsenko, E V; Voinilovich, A G; Rzheutskii, N V; Pavlovskii, V N; Yablonskii, G P; Sorokin, S V; Gronin, S V; Sedova, I V; Kop'ev, Petr S; Ivanov, Sergei V; Alanzi, M; Hamidalddin, A; Alyamani, A

2013-05-31T23:59:59.000Z

152

Room Temperature, Intrinsic Vacancy Mediated Ferromagnetism in Cr:Ga2Se3/Si E. N. Yitamben,1,  

E-Print Network [OSTI]

Room Temperature, Intrinsic Vacancy Mediated Ferromagnetism in Cr:Ga2Se3/Si E. N. Yitamben,1, T. C of 4 µB/Cr. The intrinsic- vacancy structure of defected-zinc-blende -Ga2Se3 enables Cr incorporation, as well as strong overlap between Cr 3d states and the Se 4p states lining the intrinsic vacancy rows, ob

Olmstead, Marjorie

153

Tetrapod localities from the Triassic of the SE of European Russia Valentin P. Tverdokhlebova  

E-Print Network [OSTI]

Tetrapod localities from the Triassic of the SE of European Russia Valentin P. Tverdokhlebova State University, Ulitsa Moskovskaya, 161, Saratov 410075, Russia b Department of Earth Sciences of the southern Urals area of European Russia. The first sites were found in the 1940s, and subsequent surveys

Benton, Michael

154

Electronic structure of the Si(111):GaSe van der Waals-like surface termination  

E-Print Network [OSTI]

Electronic structure of the Si(111):GaSe van der Waals-like surface termination Reiner Rudolph-like surface termination has been determined by angle-resolved photoelectron spectroscopy using photons. This explains both the absence of a surface core-level shift in Si 2p photoelectron spectra of the terminated

Olmstead, Marjorie

155

Runions LMDZ6 se lancer dans la prparation des configuration futures,  

E-Print Network [OSTI]

. Première réunion improvisée au milieu de l'été parce qu'on se posait des questions sur le bout par lequel 19 paramètres, etc ...) - Changement de code radiatif et nouveaux forçages pour IPCC

Madeleine, Jean-Baptiste

156

Photovoltaic effect in InSe Application to Solar Energy Conversion  

E-Print Network [OSTI]

253 Photovoltaic effect in InSe Application to Solar Energy Conversion A. Segura, J. P. Guesdon, JSe is shown to be a new material with attractive characteristics for solar energy conversion. PerformanceV at 300 K and it is thus close to the theoretical optimum for solar energy conversion. Since its transport

Boyer, Edmond

157

Evidence for Gassy Sediments on the Inner Shelf of SE Korea From Geoacoustic Properties  

E-Print Network [OSTI]

1 Evidence for Gassy Sediments on the Inner Shelf of SE Korea From Geoacoustic Properties (Tuesday is characterized by an up to 40 m thick blanket of soft sediments often characterized by acoustic turbidity structures below that gas layer. Sound speeds were measured directly in these sediments using the Acoustic

158

WEATHERIZATION INDUSTRIES SAVE ENERGY ST SE SALEM, OREGON 97301 (503) 5691381 WEATHERIZATIONALLIES@GMAIL.COM  

E-Print Network [OSTI]

to be energy efficient. BPA's current standard is a U-.30. By 2015, current products will certainly be obsoleteWEATHERIZATION INDUSTRIES SAVE ENERGY 565 21ST ST SE SALEM, OREGON 97301 · (503) 5691381 AND CONSERVATION COUNCIL'S CONSERVATION PLANNING ASSUMPTIONS Weatherization Industries Save Energy (WISE

159

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

E-Print Network [OSTI]

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

Paris-Sud XI, Université de

160

1. INTRODUCCIN En lo que al transporte por carretera se refiere, en las lti-  

E-Print Network [OSTI]

modificación del Real Decreto legislativo 1302/1986 de evaluación de impacto ambiental y el Regla- mento que lo desarrolla, se exige como medida correctora, en las Declaraciones de Impacto Ambiental de proyectos de in Ciencias, Universidad Autónoma de Madrid. (**) Dirección General de Costas, Ministerio de Medio Ambiente

Espigares, Tíscar

Note: This page contains sample records for the topic "guatemala se mencionan" 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

Polarized Luminescence of Defects in CuGaSe2 Susanne Siebentritt1,2  

E-Print Network [OSTI]

). But for the whole group of I-III-VI2 chalcopyrite semiconductors no reliable identification of native defects by ESR been found in CuInSe2. [14] In the effort of relating the energy positions of the defects to defect. Res. Soc. Symp. Proc. Vol. 1012 © 2007 Materials Research Society 1012-Y13-01 #12;the experiment

Rockett, Angus

162

Characterization of an FFDM unit based on a-Se direct conversion detector  

E-Print Network [OSTI]

Characterization of an FFDM unit based on a-Se direct conversion detector Achille Albanese1 µm. The direct conversion of X-rays into charge provides excellent imaging performance. In this work, detectors based on a direct-conversion technology seem to give a better performance, especially at high

Lanconelli, Nico

163

Statistical Mechanics, CHEM 6481, Fall MWF 10:05-10:55am, MoSE 1224  

E-Print Network [OSTI]

Statistical Mechanics, CHEM 6481, Fall MWF 10:05-10:55am, MoSE 1224 Course website: T" are considered background material. Required Text: "Introduction to Modern Statistical Mechanics," David Chandler (Oxford, New York, 1982) Recommended Text: "Statistical Mechanics," Donald McQuarrie (HarperCollins, New

Sherrill, David

164

Spray Deposition of High Quality CuInSe2 and CdTe Films: Preprint  

SciTech Connect (OSTI)

A number of different ink and deposition approaches have been used for the deposition of CuInSe2 (CIS), Cu(In,Ga)Se2 (CIGS), and CdTe films. For CIS and CIGS, soluble precursors containing Cu, In, and Ga have been developed and used in two ways to produce CIS films. In the first, In-containing precursor films were sprayed on Mo-coated glass substrates and converted by rapid thermal processing (RTP) to In2Se3. Then a Cu-containing film was sprayed down on top of the In2Se3 and the stacked films were again thermally processed to give CIS. In the second approach, the Cu-, In-, and Ga-containing inks were combined in the proper ratio to produce a mixed Cu-In-Ga ink that was sprayed on substrates and thermally processed to give CIGS films directly. For CdTe deposition, ink consisting of CdTe nanoparticles dispersed in methanol was prepared and used to spray precursor films. Annealing these precursor films in the presence of CdCl2 produced large-grained CdTe films. The films were characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). Optimized spray and processing conditions are crucial to obtain dense, crystalline films.

Curtis, C. J.; van Hest, M.; Miedaner, A.; Leisch, J.; Hersh, P.; Nekuda, J.; Ginley, D. S.

2008-05-01T23:59:59.000Z

165

Resistance and current-voltage characteristics of individual superconducting NbSe2 nanowires  

SciTech Connect (OSTI)

Resistance and current-voltage characteristics of individual superconducting NbSe{sub 2} nanowires are investigated. In the current-voltage curves, a stairlike structure is observed, indicating the possible formation of phase-slip centers. A close examination of the current-voltage characteristic in a selected high quality NbSe{sub 2} nanowire with a diameter of 75 nm reveals that the characteristic voltages in the stairlike structure follow the BCS-like temperature dependence of superconducting gaps vanishing at T{sub C}. While the phase-slip center mechanism remains to be a plausible explanation of the observed features, an alternative model involving multigap Josephson tunneling is proposed to account for the BCS-like temperature dependence. From the BCS fits, two distinct superconducting gaps are extracted. Moreover, the critical current of the 75 nm nanowire at low temperatures as well as near T{sub C} can also be described by the Ambegaokar-Baratoff relation for multigap Josephson junctions. Our data suggest the possible observation of multiband superconductivity in NbSe{sub 2} and are in good agreement with the predictions of recent band structure and Fermi surface calculations on NbSe{sub 2}.

Zhou, Zhixian [ORNL; Jin, Rongying [ORNL; Eres, Gyula [ORNL; Mandrus, David [ORNL; Barzykin, Victor [University of Tennessee, Knoxville (UTK); Schlottmann, P. [Florida State University; Hor, Y.S. [Argonne National Laboratory (ANL); Xiao, X.L. [Argonne National Laboratory (ANL); Mitchell, J. F. [Argonne National Laboratory (ANL)

2007-01-01T23:59:59.000Z

166

Supporting Information Field-Effect modulation of Seebeck Coefficient in Single PbSe  

E-Print Network [OSTI]

1 Supporting Information Field-Effect modulation of Seebeck Coefficient in Single PbSe Nanowires to dry the solution and form Pb oleate. After cooling the Pb oleate solution to 60ºC, 4 mL of 0.16M and Scientific Instrument voltage amplifier, respectively. Thermoelectric power measurements were done

Yang, Peidong

167

From Bad to Worse: Senior economic inSecurity on the riSe  

E-Print Network [OSTI]

From Bad to Worse: Senior economic inSecurity on the riSe Tatjana Meschede Laura Sullivan Thomas the Senior Financial Stability Index, economic insecurity among senior households increased by one demographic groups, economic security of seniors has deteriorated further. Contrary to the popular belief

Snider, Barry B.

168

United .States Dep artme nt of the Interior Fish and Wildlife Se rvice  

E-Print Network [OSTI]

are found on the COJ:1n1a.nde r I slanc.ls , off t he Si ber i an Coa·t , be longing t o Russi a, 9 77 , 377. nde r the se cond. l ease , h o\\"ever, ther" was only one ye a r , 1896 , in which he

169

7900 SE 28th Street, Suite 200 Mercer, Island, WA 98040-2970  

E-Print Network [OSTI]

7900 SE 28th Street, Suite 200 Mercer, Island, WA 98040-2970 v 206.236.7200 f 206.236.3019 www-standing rivalries over the distribution of the Northwest's premiere asset. It will allow the customers to apply to acquire new generation assets. This conclusion, also reached by the Comprehensive Review of the Northwest

170

Cu(In,Ga)Se2based Photovoltaics: Challenges and Opportunities  

E-Print Network [OSTI]

Cu(In,Ga)Se2­based Photovoltaics: Challenges and Opportunities William Shafarman Institute of Energy Conversion University of Delaware #12;Thin Film Photovoltaics Potential for low cost PV using a Thickness K.Kim, et al., IEEE J. Photovoltaics, 3, 446 (2013). 2 µm, 60 min reaction 1 µm, 25 min reaction 0

Firestone, Jeremy

171

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

SciTech Connect (OSTI)

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

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

2014-04-24T23:59:59.000Z

172

Photoconductivity and luminescence in GaSe crystals at high levels of optical excitation  

SciTech Connect (OSTI)

The photoconductivity and luminescence of GaSe layered crystals at high levels of optical excitation are studied experimentally. The specific features observed in the photoconductivity and photoluminescence spectra are controlled by the nonlinear optical absorption in the region of excitonic resonance.

Kyazym-zade, A. G.; Salmanov, V. M., E-mail: vagif_salmanov@yahoo.com; Salmanova, A. A. [Baku State University (Azerbaijan); Alieva, A. M.; Ibaeva, R. Z. [National Academy of Sciences, Institute of Physics (Azerbaijan)

2010-03-15T23:59:59.000Z

173

Mechanical impedance and CPX noise of SMA V.F. Vazquez and S.E. Paje  

E-Print Network [OSTI]

to the volume population affected, are transportation systems like motor vehicles. Tire road noise is the noiseMechanical impedance and CPX noise of SMA pavements V.F. V´azquez and S.E. Paje UCLM-LA2IC, Av 2012 Nantes Conference 23-27 April 2012, Nantes, France 167 #12;CPX noise is the sound measured

Boyer, Edmond

174

Se relacionan cuatro taxones que constituyen novedadespara el Catlogo de Flora Vascular del  

E-Print Network [OSTI]

lainzii U. Gómez Navarro & al.)A. Pujadas & Triano, combo nov. Estas plantas se conocen en nuestro fructificación. 12-VI-2011, A. Benavente Navarro, J. Martínez & A. Benavente Martínez GDA 58269. Orobanche lainzii U. Gómez Navarro & al.) A. Pujadas & Triano, combo nov. (OROBANCHACEAE). Planta de porte pequeño

Herrera, Carlos M.

175

Guatemala-Joint Programme on Resource Efficient and Cleaner Production  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy Resources Jump to: navigation,Ohio:Greer County is a county inAl., It is classified(RECP) in Developing

176

Guatemala-UNEP Risoe Technology Needs Assessment Program | Open Energy  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy Resources Jump to: navigation,Ohio:Greer County is a county inAl., It is classified(RECP) in

177

Guatemala-Enhancing Capacity for Low Emission Development Strategies  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision hasInformation Earth's Heat Jump to:Photon Place:Net Jump

178

Guatemala-IAEA Energy Planning | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision hasInformation Earth's Heat Jump to:Photon Place:Net Jump Agency/Company /Organization International

179

Guatemala-USAID Climate Activities | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision hasInformation Earth's Heat Jump to:Photon Place:Net Jump Agency/Company /Organization

180

Thermoelectric properties of indium doped PbTe{sub 1-y}Se{sub y} alloys  

SciTech Connect (OSTI)

Lead telluride and its alloys are well known for their thermoelectric applications. Here, a systematic study of PbTe{sub 1-y}Se{sub y} alloys doped with indium has been done. The powder X-Ray diffraction combined with Rietveld analysis confirmed the polycrystalline single phase nature of the samples, while microstructural analysis with scanning electron microscope results showed densification of samples and presence of micrometer sized particles. The temperature dependent transport properties showed that in these alloys, indium neither pinned the Fermi level as it does in PbTe, nor acted as a resonant dopant as in SnTe. At high temperatures, bipolar effect was observed which restricted the zT to 0.66 at 800?K for the sample with 30% Se content.

Bali, Ashoka; Mallik, Ramesh Chandra, E-mail: rcmallik@physics.iisc.ernet.in [Thermoelectric Materials and Devices Laboratory, Department of Physics, Indian Institute of Science, Bangalore 560012, Karnataka (India); Wang, Heng; Snyder, G. Jeffrey [Department of Materials Science, California Institute of Technology, Pasadena, California 91125 (United States)

2014-07-21T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" 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

Photoluminescence studies of type-II CdSe/CdTe superlattices  

SciTech Connect (OSTI)

CdSe/CdTe type-II superlattices grown on GaSb substrates by molecular beam epitaxy are studied using time-resolved and steady-state photoluminescence (PL) spectroscopy at 10 K. The relatively long carrier lifetime of 188 ns observed in time-resolved PL measurements shows good material quality. The steady-state PL peak position exhibits a blue shift with increasing excess carrier concentration. Self-consistent solutions of the Schroedinger and Poisson equations show that this effect can be explained by band bending as a result of the spatial separation of electrons and holes, which is critical confirmation of a strong type-II band edge alignment between CdSe and CdTe.

Li Jingjing; Johnson, Shane R.; Wang Shumin; Ding Ding; Ning Cunzheng; Zhang Yonghang [Center for Photonics Innovation, Arizona State University, Tempe, Arizona 85287-5706 (United States); School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287-5706 (United States); Yin Leijun [Center for Photonics Innovation, Arizona State University, Tempe, Arizona 85287-5706 (United States); Department of Physics, Arizona State University, Tempe, Arizona 85287-1504 (United States); Skromme, B. J. [School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287-5706 (United States); Liu Xinyu; Furdyna, Jacek K. [Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)

2012-08-06T23:59:59.000Z

182

Optical transitions in MnGa{sub 2}Se{sub 4}  

SciTech Connect (OSTI)

The dependence of the absorption coefficient on incident photon energy in a MnGa{sub 2}Se{sub 4} single crystal has been investigated in the temperature range 110-295 K. Using group-theory analysis of the electron state symmetry and comparison of the symmetry of the energy spectrum of MnGa{sub 2}Se{sub 4} and its isoelectronic analogs, a conclusion about the character of optical transitions has been drawn. It is shown that the features observed at 2.31 and 2.45 eV are related to the intracenter transitions {sup 6}A{sub 1}{sup 1} {yields} {sup 4}T{sub 2}({sup 4}G) and {sup 6}A{sub 1}{sup 2} {yields} {sup 4}T{sub 2}({sup 4}G). The {sup 6}A{sub 1} state is split by the crystal field.

Tagiev, B. G.; Kerimova, T. G., E-mail: ktaira@physics.ab.az; Tagiev, O. B.; Asadullayeva, S. G.; Mamedova, I. A. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2012-06-15T23:59:59.000Z

183

Optical nonlinear absorption characteristics of Sb{sub 2}Se{sub 3} nanoparticles  

SciTech Connect (OSTI)

In this work, we report for the first time, the nonlinear optical absorption properties of antimony selenide (Sb{sub 2}Se{sub 3}) nanoparticles synthesized through solvothermal route. X-ray diffraction results revealed the crystalline nature of the nanoparticles. Electron microscopy studies revealed that the nanoparticles are in the range of 10 - 40 nm. Elemental analysis was performed using EDAX. By employing open aperture z-scan technique, we have evaluated the effective two-photon absorption coefficient of Sb{sub 2}Se{sub 3} nanoparticles to be 5e-10 m/W at 532 nm. These nanoparticles exhibit strong intensity dependent nonlinear optical absorption and hence could be considered to have optical power limiting applications in the visible range.

Muralikrishna, Molli, E-mail: muralikrishnamolli@sssihl.edu.in; Kiran, Aditha Sai, E-mail: muralikrishnamolli@sssihl.edu.in; Ravikanth, B., E-mail: muralikrishnamolli@sssihl.edu.in; Sowmendran, P., E-mail: muralikrishnamolli@sssihl.edu.in; Muthukumar, V. Sai, E-mail: muralikrishnamolli@sssihl.edu.in; Venkataramaniah, Kamisetti, E-mail: muralikrishnamolli@sssihl.edu.in [Department of Physics, Sri Sathya Sai Institute of Higher Learning, Prasanthinilayam-515 134 (India)

2014-04-24T23:59:59.000Z

184

Effect of lanthanide contraction on the mixed polyamine systems Ln/Sb/Se/(en+dien) and Ln/Sb/Se/(en+trien): Syntheses and characterizations of lanthanide complexes with a tetraelenidoantimonate ligand  

SciTech Connect (OSTI)

Mixed polyamine systems Ln/Sb/Se/(en+dien) and Ln/Sb/Se/(en+trien) (Ln=lanthanide, en=ethylenediamine, dien=diethylenetriamine, trien=triethylenetetramine) were investigated under solvothermal conditions, and novel mixed-coordinated lanthanide(III) complexes [Ln(en){sub 2}(dien)({eta}{sup 2}-SbSe{sub 4})] (Ln=Ce(1a), Nd(1b)), [Ln(en){sub 2}(dien)(SbSe{sub 4})] (Ln=Sm(2a), Gd(2b), Dy(2c)), [Ln(en)(trien)({mu}-{eta}{sup 1},{eta}{sup 2}-SbSe{sub 4})]{sub {infinity}} (Ln=Ce(3a), Nd(3b)) and [Sm(en)(trien)({eta}{sup 2}-SbSe{sub 4})] (4a) were prepared. Two structural types of lanthanide selenidoantimonates were obtained across the lanthanide series in both en+dien and en+trien systems. The tetrahedral anion [SbSe{sub 4}]{sup 3-} acts as a monodentate ligand mono-SbSe{sub 4}, a bidentate chelating ligand {eta}{sup 2}-SbSe{sub 4} or a tridentate bridging ligand {mu}-{eta}{sup 1},{eta}{sup 2}-SbSe{sub 4} to the lanthanide(III) center depending on the Ln{sup 3+} ions and the mixed ethylene polyamines, indicating the effect of lanthanide contraction on the structures of the lanthanide(III) selenidoantimonates. The lanthanide selenidoantimonates exhibit semiconducting properties with E{sub g} between 2.08 and 2.51 eV. - Graphical Abstract: Two structural types of lanthanide(III) selenidoantimonates are formed in both en-dien and en-trien mixed polyamines across lanthanide series, indicating the lanthanide contraction effect on the structures of the lanthanide(III) selenidoantimonates. Highlights: > Two structural types of lanthanide selenidoantimonates are prepared across the lanthanide series in both Ln/Sb/Se/(en+dien) and Ln/Sb/Se/(en+trien) systems. > The [SbSe{sub 4}]{sup 3-} anion acts as a mono-SbSe{sub 4}, a {eta}{sup 2}-SbSe{sub 4} or a {mu}-{eta}{sup 1},{eta}{sup 2}-SbSe{sub 4} ligand to the Ln{sup 3+} ions. > The soft base ligand [SbSe{sub 4}]{sup 3-} can be controlled to coordinate to the Ln{sup 3+} ions with en+dien and en+trien as co-ligands.

Zhao Jing; Liang Jingjing; Pan Yingli; Zhang Yong [Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University, No. 199 Hengyi Road, Suzhou 215123 (China); Jia Dingxian, E-mail: jiadingxian@suda.edu.cn [Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University, No. 199 Hengyi Road, Suzhou 215123 (China)

2011-06-15T23:59:59.000Z

185

FI 10 19 dcembre 2006 page Alan Turing se fraye un chemin jusqu'  

E-Print Network [OSTI]

FI 10 ­ 19 décembre 2006 ­ page Alan Turing se fraye un chemin jusqu'à la place de lPiccard,cheminJeanTschumi,avenueForel,rue RobertMercier,chemin, place ou rueAlanTuring. EtquefaisaitAlanTuringcheminfaisant?Leplus souvent,craqueurducodesecretdela machineEnigma?Certesexagéré,maisle succèsaplusieursparentsetAlanTuring estaumoinslegrandpèreoul

Teuscher, Christof

186

A inevitabilidade de um sismo em Lisboa, s no se sabendo  

E-Print Network [OSTI]

ALTO RISCO SÍSMICO EM LISBOA · A inevitabilidade de um sismo em Lisboa, só não se sabendo a data.balasteiro@sol.pt O SOL fez uma ronda pela capital, acompanhado por especialistas: em caso de sismo, muitos hospitais prô- i ximo sismo de gran- I des dimensões em I Lisboa - uma certe- z a científica, segun- do os

Instituto de Sistemas e Robotica

187

Maana se presenta la Ctedra de Medicina de la Reproduccin de la Universidad de Alicante  

E-Print Network [OSTI]

Mañana se presenta la Cátedra de Medicina de la Reproducción de la Universidad de Alicante El acto cátedra de Medicina de la Reproducción de la Universidad de Alicante. El acto contará con la participación Hora: 12 horas Motivo: Presentación de la Cátedra de Medicina Reproductiva de la Universidad de

Escolano, Francisco

188

Single-Neutron Excitations in Neutron-Rich 83Ge and 85Se  

SciTech Connect (OSTI)

The 2H(82Ge,p)83Ge and 2H(84Se,p)85Se reactions were studied with radioactive beams of 82Ge and 84Se at beam energies of Ebeam = 330 and 380 MeV, respectively. Excitation energies, proton angular distributions, and asymptotic normalization coefficients have been determined for the lowest lying states of 83Ge and 85Se. Spectroscopic factors have also been extracted under normal assumptions of the bound-state potential properties in the DWBA analysis. However, the peripheral character of the measurements leads to large uncertainties in this extraction. Shell model calculations have been performed in the region above 78Ni, comparing the single-particle properties of the even-Z, N = 51 nuclei up to 91Zr and including 83Ge and 85Se. Direct-semidirect neutron capture calculations to 83Ge and 85Se have also been performed using the spectroscopic input from these (d,p) reaction measurements.

Thomas, Jeffrey S [ORNL; Arbanas, Goran [ORNL; Bardayan, Daniel W [ORNL; Blackmon, Jeff C [ORNL; Cizewski, Jolie [ORNL; Dean, David Jarvis [ORNL; Fitzgerald, Ryan [ORNL; Greife, Uwe [ORNL; Gross, Carl J [ORNL; Johnson, Micah [ORNL; Grzywacz-Jones, Kate L [ORNL; KOZUB, RAYMOND L [ORNL; Liang, J Felix [ORNL; Livesay, Jake [ORNL; Ma, Zhanwen [ORNL; Moazen, Brian H [ORNL; Nesaraja, Caroline D [ORNL; Shapira, Dan [ORNL; Smith, Michael Scott [ORNL; Visser, Dale William [ORNL

2007-01-01T23:59:59.000Z

189

DISSERTATION IMPACT OF SECONDARY BARRIERS ON CuIn1-xGaxSe2 SOLAR-CELL  

E-Print Network [OSTI]

Impact of Secondary Barriers on CuIn1-xGaxSe2 Solar-Cell Operation Thin-film solar cells based on CuInSe2 of thin-film solar-cell tandems. Since the bottom cells are exposed to practically only "red" photonsDISSERTATION IMPACT OF SECONDARY BARRIERS ON CuIn1-xGaxSe2 SOLAR-CELL OPERATION Submitted by Alexei

Sites, James R.

190

Investigation of polycrystalline thin-film CuInSe{sub 2} solar cells based on ZnSe windows. Annual subcontract report, 15 Febraury 1992--14 February 1993  

SciTech Connect (OSTI)

Investigations of ZnSe/CIS solar cells are being carried out in an effort to improve the efficiencies CIS cells and to determine if ZnSe is a viable alternative to CdS as a window material. MOCVD growth of ZnSe is accomplished in a SPIRE 500XT reactor housed in the Electronic Materials Laboratory at WSU Tri-Cities by reacting a zinc adduct with H{sub 2}Se. Conductive n-type ZnSe is grown by using iodine as a dopant. Ethyliodide was mixed with helium and installed on one of the gas lines to the system. ZnSe films have been grown on CIS substrates at 200{degrees}C to 250{degrees}C. ZnO is also being deposited by MOCVD by reacting tetrahydrofuran (THF) with a zinc adduct. ZnSe/CIS heterojunctions have been studied by growing n-ZnSe films onto 2 cm x 2 cm CIS substrates diced from materials supplied by Siemens and then depositing an array of aluminum circular areas 2.8.mm in diameter on top of the ZnSe to serve as contacts. Al films are deposited with a thickness of 80 to l00 {angstrom}so that light can pass through the film, thus allowing the illuminated characteristics of the ZnSe/CIS junction to be tested. Accounting for the 20 to 25 % transmittance through the Al film into the ZnSe/CIS structure, current devices have estimated, active-area AM1.5 efficiencies of 14 %. Open circuit voltages > 500 mV are often attained.

Olsen, L C [Washington State Univ. at Tri-Cities, Richland, WA (United States)

1994-05-01T23:59:59.000Z

191

Network Rigidity in GeSe2 Glass at High Pressure  

SciTech Connect (OSTI)

Acoustic measurements using synchrotron radiation have been performed on glassy GeSe2 up to pressures of 9.6 GPa. A minimum observed in the shear-wave velocity, associated anomalous behavior in Poisson's ratio, and discontinuities in elastic moduli at 4 GPa are indicative of a gradual structural transition in the glass. This is attributed to a network rigidity minimum originating from a competition between two densification mechanisms. At pressures up to 3 GPa, a conversion from edge- to corner-sharing tetrahedra results in a more flexible network. This is contrasted by a gradual increase in coordination number with pressure, which leads to an overall stiffening of the glass.

Antao,S.; Benmore , C.; Li, B.; Wang, L.; Bychkov, E.; Parise, J.

2008-01-01T23:59:59.000Z

192

Ann bay lodyans 7 / se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network [OSTI]

("Tonton Liben") ki pare ti liv sa a. AYITI SE PEP AYISYEN PM 7854 .H39 A56 Enstiti Etid Ayisyen - Inivesite Kannzas Bon Nouvel Fondasyon Alfa Lwes 1997 MALIS AP VANN, WA AP PRAN Yon jou yon neg t ap fe yon ti vizit lakay Malis. Pandan li t ap... I ak nan lespri I, ti lanp sa a ap pemet li we sot isit rive nan Ginen, menm anndan yon kay ki femen ak mi." Neg la mande: "Eske ou te seye sa deja?" Malis reponn: "O non, monche! Eske ou kwe m ta ka rete konsa jis pou m ka fe jouda, fouye lavi...

Freeman, Bryant C.

2000-01-01T23:59:59.000Z

193

Low-temperature recrystallization of Ge nanolayers on ZnSe  

SciTech Connect (OSTI)

The in situ X-ray photoelectron spectroscopy observation of low-temperature recrystallization of an amorphous Ge layer deposited on a ZnSe film at room temperature is reported. It is shown that the experimentally measured shifts of the Ge 3d core level are consistent with the changes observed in the crystal structure of the layer by the high-energy electron diffraction technique in the reflection mode of measurements. The shifts can be attributed to successive nanometer-scaled structural changes in the Ge layer with increasing temperature.

Suprun, S. P., E-mail: suprun@thermo.isp.nsc.ru; Fedosenko, E. V. [Russian Academy of Sciences, Institute of Semiconductor Physics, Siberian Division (Russian Federation)

2007-05-15T23:59:59.000Z

194

Tensile Strain Switched Ferromagnetism in Layered NbS2 and NbSe2 . | EMSL  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear SecurityTensile Strain Switched Ferromagnetism in Layered NbS2 and NbSe2 . Tensile Strain Switched Ferromagnetism in

195

PHaSE | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear SecurityTensile Strain Switched5 IndustrialIsadore Perlman,Bios HighRadiobiology: LowNSACNew »PHaSE Energy Frontier

196

Quantum oscillation of Rashba spin splitting in topological insulator Bi2Se3 induced by the quantum size effects of Pb adlayers  

SciTech Connect (OSTI)

Basedon rst-principlescalculationswithindensityfunctionaltheory,we ndthatPbadlayerscaninduceagiantRashbaspinsplittinginthequantumwellstatesofanunderlyingBi2Se3 lm.AsthethicknessofthePbadlayersvaries,thedistancebetweenthePbadlayerandtheBi2Se3 lm,thechargedensityattheinterface,andthebindingbetweenthePbadlayersexhibitanoscillatorybehaviorduetothequantumsizeeffects,whichinturnmodulatesthemagnitudeoftheRashbaspinsplittingofthequantumwellstatesintheBi2Se3 lm.

Yang, Hong [Xiangtan University, Xiangtan Hunan, China; Peng, Xiangyang [Xiangtan University, Xiangtan Hunan, China; Wei, Xiaolin [Xiangtan University, Xiangtan Hunan, China; Liu, Wenliang [Xiangtan University, Xiangtan Hunan, China; Zhu, Wenguang [ORNL; Xiao, Di [ORNL; Stocks, George Malcolm [ORNL; Zhong, Jianxin [Xiangtan University, Xiangtan Hunan, China

2012-01-01T23:59:59.000Z

197

SeZnSb alloy and its nano tubes, graphene composites properties  

SciTech Connect (OSTI)

Composite can alter the individual element physical property, could be useful to define the specific use of the material. Therefore, work demonstrates the synthesis of a new composition Se{sub 96}-Zn{sub 2}-Sb{sub 2} and its composites with 0.05% multi-walled carbon nano tubes and 0.05% bilayer graphene, in the glassy form. The diffused amorphous structure of the multi walled carbon nano tubes and bilayer gaphene in the Se{sub 96}-Zn{sub 2}-Sb{sub 2} alloy have been analyzed by using the Raman, X-ray photoluminescence spectroscopy, Furrier transmission infrared spectra, photoluminescence, UV/visible absorption spectroscopic measurements. The diffused prime Raman bands (G and D) have been appeared for the multi walled carbon nano tubes and graphene composites, while the X-ray photoluminescence core energy levels peak shifts have been observed for the composite materials. Subsequently the photoluminescence property at room temperature and a drastic enhancement (upto 80%) in infrared transmission percentage has been obtained for the bilayer graphene composite, along with optical energy band gaps for these materials have been evaluated 1.37, 1.39 and 1.41 eV.

Singh, Abhay Kumar [Department of Physics, Indian Institute of Physics, Bangalore-560012 (India)

2013-04-15T23:59:59.000Z

198

Effect of Ligands on Characteristics of (CdSe)13 Quantum Dot  

SciTech Connect (OSTI)

The widespread applications of quantum dots (QDs) have spurred an increasing interest in the study of their coating ligands, which can not only protect the electronic structures of the central QDs, but also control their permeability through biological membranes with both size and shape. In this work, we have used density functional theory (DFT) to investigate the electronic structures of (CdSe)13 passivated by OPMe2(CH2)nMe ligands with different lengths and various numbers of branches (Me=methyl group, n = 0, 1-3). Our results show that the absorption peak in the ultraviolet-visible (UV-vis) spectra displays a clear blue-shift, on the scale of ~100 nm, upon the binding of ligands. Once the total number of ligands bound with (CdSe)13 reached a saturated number (9 or 10), no more blue-shift occurred in the absorption peak in the UV-vis spectra. On the other hand, the aliphatic chain length of ligands has a negligible effect on the optical properties of the QD core. Analyses of the bonding characteristics confirm that optical transitions are dominantly governed by the central QD core rather than the organic passivation. Interestingly, the density of states (DOS) share similar characteristics as vibrational spectra, even though there is no coordination vibration mode between the ligands and the central QD. These findings might provide insights on the material design for the passivation of quantum dots for biomedical applications.

Gao, Yang; Zhou, Bo; Kang, Seung-gu; Xin, Minsi; Yang, Ping; Dai, Xing; Wang, Zhigang; Zhou, Ruhong

2014-01-01T23:59:59.000Z

199

Absorption spectra of CdSe-ZnS core-shell quantum dots at high photon energies : experiment and modeling  

E-Print Network [OSTI]

Absorption spectra of CdSe-ZnS core-shell quantum dots at high photon energies : experiment spectra of CdSe-ZnS core-shell quantum dot (QD) ensembles, with average core diameters ranging from 2.6 nm. In agreement with previous reports, the absorption coefficient at energies 1 eV above the effective bandgap

Ghosh, Sandip

200

Reversible Modification of CdSe-CdS/ZnS Quantum Dot Fluorescence by Surrounding Ca2+  

E-Print Network [OSTI]

Reversible Modification of CdSe-CdS/ZnS Quantum Dot Fluorescence by Surrounding Ca2+ Ions Li Li (3-MPA) coated CdSe-CdS/ZnS core-multishell QDs when free Ca2+ ions were added to and subsequently removed from the QD solution. It was found that QD fluorescence intensity was reduced when Ca2+ ions were

Haviland, David

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201

Singularit du pouvoir thermolectrique de NbSe3 la transition T1 A. Bonnet, A. Conan et P. Said (*)  

E-Print Network [OSTI]

difficultes a classer NbSe3. - Le trichalcog6nure de niobium NbSe3 est d6crit comme un compose 1 ou 2orie maintenant bien 6tablie [4, 5] sont typiquement observes sur les dichalcog6nures en couches. Maisnures. 11 parait int6ressant de dresser la liste de ces differences. Notons

Paris-Sud XI, Université de

202

Atomic structures and electronic properties of 2H-NbSe{sub 2}: The impact of Ti doping  

SciTech Connect (OSTI)

Layered transition metal dichalcogenides have aroused renewed interest as electronic materials, yet their electronic performances could be modified by chemical doping. Here, we perform a systematic first-principles calculation to investigate the effect of Ti doping on atomic structure and electronic properties of the 2H-NbSe{sub 2}. We consider a total of three possible Ti-doping models and find that both the substitution and intercalated models are chemically preferred with the intercalation model being more favorable than the substitution one. Structural analyses reveal a slight lattice distortion triggered by Ti doping, but the original structure of 2H-NbSe{sub 2} is maintained. We also observe an expansion of c axis in the substituted model, which is attributed to the reduced van der Waals interaction arising from the increased Se-Se bond length. Our calculations also predict that the electron transport properties can be enhanced by the Ti doping, especially for the Ti-intercalated 2H-NbSe{sub 2}, which should be beneficial for the realization of superconductivity. Furthermore, the covalence element is found in the Ti-Se bonds, which is ascribed to the hybridization of Ti 3d and Se 4p orbitals. The findings indicate that doping of transition metals can be regarded as a useful way to tailor electronic states so as to improve electron transport properties of 2H-NbSe{sub 2}.

Li, Hongping, E-mail: hpli@mail.ujs.edu.cn, E-mail: zcwang@wpi-aimr.tohoku.ac.jp; Chen, Lin; Zhang, Kun; Liang, Jiaqing; Tang, Hua; Li, Changsheng [Institute for Advanced Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013 (China); Liu, Xiaojuan; Meng, Jian [State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China); Wang, Zhongchang, E-mail: hpli@mail.ujs.edu.cn, E-mail: zcwang@wpi-aimr.tohoku.ac.jp [Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan)

2014-09-14T23:59:59.000Z

203

Intrinsic vacancy induced nanoscale wire structure in heteroepitaxial Ga2Se3/Si(001) Taisuke Ohta,1,  

E-Print Network [OSTI]

Intrinsic vacancy induced nanoscale wire structure in heteroepitaxial Ga2Se3/Si(001) Taisuke Ohta,1-blende structure of -Ga2Se3, which contains ordered 110 arrays of Ga vacancies. These ordered vacancy lines structural vacancies of semiconducting chalcogenides lead to numerous interesting structural, electronic

Olmstead, Marjorie

204

Hydrogen passivation of Se and Te in AlSb M. D. McCluskey and E. E. Haller  

E-Print Network [OSTI]

Hydrogen passivation of Se and Te in AlSb M. D. McCluskey and E. E. Haller Lawrence Berkeley observed local vibrational modes LVM's arising from DX-hydrogen complex in AlSb. Hydrogen was diffused into bulk AlSb:Se and AlSb:Te by annealing in sealed quartz ampoules with either hydrogen gas or methanol CH

McCluskey, Matthew

205

Petrography and genetic history of coffinite and uraninite from the Liueryiqi granite-hosted uranium deposit, SE China  

E-Print Network [OSTI]

-hosted uranium deposit, SE China Maozhong Mina,b,*, Changquan Fanga , Mostafa Fayekc a Department of Earth-hosted uranium deposit, SE China, form a unique bbull's-eyeQ texture. These aggregates consist of concentric% at temperatures between 126 and 178 8C and a lithostatic pressure of 500 to 800 bars. Uranium was likely

Fayek, Mostafa

206

Interaction of Se{sup 0} nanoparticles stabilized by poly(vinylpyrrolidone) with gel films of cellulose Acetobacter xylinum  

SciTech Connect (OSTI)

The sorption and desorption of poly(vinylpyrrolidone)-Se{sup 0} (PVP-Se{sup 0}) nanoparticles on gel films of cellulose Acetobacter xylinum (CAX) are investigated. It is revealed that the hydrodynamic radius R{sub h} of PVP-Se{sup 0} nanoparticles decreases from 57 nm in the initial solution (without CAX gel films) to 25 nm after the sorption of nanostructures on gel films and then increases to approximately 100 nm after the desorption of nanoparticles with water from dry samples of the CAX gel film-PVP-Se{sup 0} nanocomposite. It is found that selenium atoms do not penetrate into crystallites of the cellulose nanofibrils and replace water molecules sorbed by the primary hydroxyl groups of their walls. Poly(vinylpyrrolidone)-Se{sup 0} nanoclusters differ in the number and size upon their sorption inside the cellulose gel film and on the film surface.

Baklagina, Yu. G.; Khripunov, A. K. [Russian Academy of Sciences, Institute of Macromolecular Compounds (Russian Federation); Tkachenko, A. A. [St. Petersburg State University (Russian Federation); Suvorova, E. I.; Klechkovskaya, V. V. [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)], E-mail: klechvv@ns.crys.ras.ru; Borovikova, L. N.; Smyslov, R. Yu. [Russian Academy of Sciences, Institute of Macromolecular Compounds (Russian Federation); Nilova, V. K. [Russian Academy of Sciences, Institute of Cytology (Russian Federation); Nazarkina, Ya. I.; Lavrent'ev, V. K.; Valueva, S. V.; Kipper, A. I.; Kopeikin, V. V. [Russian Academy of Sciences, Institute of Macromolecular Compounds (Russian Federation)

2006-07-15T23:59:59.000Z

207

Migrating data from TcSE to DOORS : an evaluation of the T-Plan Integrator software application.  

SciTech Connect (OSTI)

This report describes our evaluation of the T-Plan Integrator software application as it was used to transfer a real data set from the Teamcenter for Systems Engineering (TcSE) software application to the DOORS software application. The T-Plan Integrator was evaluated to determine if it would meet the needs of Sandia National Laboratories to migrate our existing data sets from TcSE to DOORS. This report presents the struggles of migrating data and focuses on how the Integrator can be used to map a data set and its data architecture from TcSE to DOORS. Finally, this report describes how the bulk of the migration can take place using the Integrator; however, about 20-30% of the data would need to be transferred from TcSE to DOORS manually. This report does not evaluate the transfer of data from DOORS to TcSE.

Post, Debra S. (Sandia National Laboratories, Livermore, CA); Manzanares, David A.; Taylor, Jeffrey L.

2011-02-01T23:59:59.000Z

208

ZnO/Cu(InGa)Se2 solar cells prepared by vapor phase Zn doping  

DOE Patents [OSTI]

A process for making a thin film ZnO/Cu(InGa)Se2 solar cell without depositing a buffer layer and by Zn doping from a vapor phase, comprising: depositing Cu(InGa)Se2 layer on a metal back contact deposited on a glass substrate; heating the Cu(InGa)Se2 layer on the metal back contact on the glass substrate to a temperature range between about 100.degree. C. to about 250.degree. C.; subjecting the heated layer of Cu(InGa)Se2 to an evaporant species from a Zn compound; and sputter depositing ZnO on the Zn compound evaporant species treated layer of Cu(InGa)Se2.

Ramanathan, Kannan; Hasoon, Falah S.; Asher, Sarah E.; Dolan, James; Keane, James C.

2007-02-20T23:59:59.000Z

209

The surface-state of the topological insulator Bi2Se3 revealed by cyclotron resonance  

SciTech Connect (OSTI)

Transport measurements of topological insulators are dominated by the conductivity of the bulk, leading to substantial difficulties in resolving the properties of the surface. To this end, we use high magnetic field, rf- and microwave-spectroscopy to selectively couple to the surface conductivity of Bi2Se3 at high frequency. In the frequency range of a few GHz we observe a crossover from quantum oscillations indicative of a small 3D Fermi surface, to cyclotron resonance indicative of a 2D surface state. By probing the conductivity at reduced skin depths, we have observed a 2D cyclotron resonance from a material whose bulk Fermi-surface is 3D. The frequency-magnetic field scaling of this resonance is inconsistent with the bulk effective mass, but more consistent with the dispersion and band filling of a Dirac-like surface state as observed by ARPES, with substantial manybody renormalization.

Mcdonald, Ross D [Los Alamos National Laboratory; Ayala - Valenzuela, Oscar E [Los Alamos National Laboratory; Altarawneh, Moaz M [Los Alamos National Laboratory; Analytis, James G [STANFORD UNIV/SLAC; Chu, J. H. [STANFORD UNIV/SLAC; Fisher, R. [STANFORD UNIV/SLAC

2011-01-14T23:59:59.000Z

210

Energy levels and radiative transition rates for Ge XXXI, As XXXII, and Se XXXIII  

SciTech Connect (OSTI)

Fine-structure energies of the 67 levels belonging to the 1s{sup 2}, 1s 2l, 1s3l, 1s4l, 1s5l, and 1s6l configurations of Ge XXXI, As XXXII, and Se XXXIII have been calculated using the General-Purpose Relativistic Atomic Structure Package. In addition, radiative rates, oscillator strengths, transition wavelengths, and line strengths have been calculated for all electric dipole, magnetic dipole, electric quadrupole, and magnetic quadrupole transitions among these levels. Lifetimes are also presented for all excited levels of these three ions. We have compared our results with the results available in the literature and the accuracy of the data is assessed. We predict new energy levels, oscillator strengths, and transition probabilities where no other theoretical or experimental results are available, which will form the basis for future experimental work.

Aggarwal, Sunny, E-mail: sunny.du87@gmail.com; Singh, J.; Jha, A.K.S.; Mohan, Man

2014-07-15T23:59:59.000Z

211

Stable N-CuInSe.sub.2 /iodide-iodine photoelectrochemical cell  

DOE Patents [OSTI]

In a photoelectrochemical solar cell, stable output and solar efficiency in excess of 10% are achieved with a photoanode of n-CuInSe.sub.2 electrode material and an iodine/iodide redox couple used in a liquid electrolyte. The photoanode is prepared by treating the electrode material by chemical etching, for example in Br.sub.2 /MeOH; heating the etched electrode material in air or oxygen; depositing a surface film coating of indium on the electrode material after the initial heating; and thereafter again heating the electrode material in air or oxygen to oxidize the indium. The electrolyte is treated by the addition of Cu.sup.+ or Cu.sup.2+ salts and In.sup.3+ salts.

Cahen, David (Rehovot, IL); Chen, Yih W. (Lakewood, CO)

1985-01-01T23:59:59.000Z

212

Characterization of Se-loaded molecular sieves A, X, Y, AlPO-5, and mordenite  

SciTech Connect (OSTI)

Selenium has been successfully loaded into molecular sieves A, X, Y, AlPO-5, and mordenite, and the products were characterized by using EXAFS, solid-state NMR, and diffuse-reflectance techniques. This study reveals selenium is predominantly of the trigonal (helical chains) form in all but the A sample, where only the Se/sub 8/-crown ring form is found. A mixture of allotropes and helical chains occupy the large 3D-pore and channel systems of molecular sieves X and Y; however, a single, probably fixed-pitch helical-chain allotrope occupies the more constrained 12-membered-ring channels found in mordenite and AlPO-5. The high degree of order in these last two sieves is reflected in a strong second-shell feature in the EXAFS spectra. 22 refs., 12 figs., 3 tabs.

Parise, J.B.; MacDougall, J.E.; Herron, N.; Farlee, R.; Sleight, A.W.; Ying Wang; Bein, T.; Moller, K.; Moroney, L.M.

1988-01-27T23:59:59.000Z

213

Environmental issues related to commercialization of CulnSe{sub 2}- based photovoltaics  

SciTech Connect (OSTI)

One of the most promising materials for low-cost thin film photovoltaic cells is copper indium selenide (CuInSe{sub 2} or CIS). As with any new material, successful commercialization of CIS photovoltaic (PV) technology will require attention to environmental issues related to the sources of raw materials, their usage, and the disposal and/or recycling of products at the end of their useful life. This paper focuses on three specific environmental issues related to CIS technology: (i) Economics of the use and re-use of materials; (ii) regulations on environmental disposal and waste handling, and (iii) logistics and economics of recycling and disposing of products by industries faced with comparable environmental issues.

Eberspacher, C. [UNISUN, Newbury Park, CA (United States); Fthenakis, V.M.; Moskowitz, P.D.

1996-07-01T23:59:59.000Z

214

Co-Evaporated Cu2ZnSnSe4 Films and Devices  

SciTech Connect (OSTI)

The use of vacuum co-evaporation to produce Cu2ZnSnSe4 photovoltaic devices with 9.15% total-area efficiency is described. These new results suggest that the early success of the atmospheric techniques for kesterite photovoltaics may be related to the ease with which one can control film composition and volatile phases, rather than a fundamental benefit of atmospheric conditions for film properties. The co-evaporation growth recipe is documented, as is the motivation for various features of the recipe. Characteristics of the resulting kesterite films and devices are shown in scanning electron micrographs, including photoluminescence, current-voltage, and quantum efficiency. Current-voltage curves demonstrate low series resistance without the light-dark cross-over seen in many devices in the literature. Band gap indicated by quantum efficiency and photoluminescence is roughly consistent with that expected from first principles calculation.

Repins, I.; Beall, C.; Vora, N.; DeHart, C.; Kuciauskas, D.; Dippo, P.; To, B.; Mann, J.; Hsu, W. C.; Goodrich, A.; Noufi, R.

2012-06-01T23:59:59.000Z

215

Nuclear Structure Relevant to Neutrinoless Double Beta Decay: 76Ge and 76Se  

E-Print Network [OSTI]

The possibility of observing neutrinoless double beta decay offers the opportunity of determining the neutrino mass IF the nuclear matrix element were known. Theoretical calculations are uncertain and measurements of the occupations of valence orbits by nucleons active in the decay can be important. The occupation of valence neutron orbits in the ground states of 76Ge and 76Se were determined by precisely measuring cross sections for both neutron-adding and removing transfer reactions. Our results indicate that the Fermi surface is much more diffuse than in theoretical (QRPA) calculations. We find that the populations of at least three orbits change significantly between these two ground states while in the calculations the changes are confined primarily to one orbit.

J. P. Schiffer; S. J. Freeman; J. A. Clark; C. Deibel; C. R. Fitzpatrick; S. Gros; A. Heinz; D. Hirata; C. L. Jiang; B. P. Kay; A. Parikh; P. D. Parker; K. E. Rehm; A. C. C. Villari; V. Werner; C. Wrede

2007-10-03T23:59:59.000Z

216

Nuclear Structure Relevant to Neutrinoless Double {beta} Decay: {sup 76}Ge and {sup 76}Se  

SciTech Connect (OSTI)

The possibility of observing neutrinoless double {beta} decay offers the opportunity of determining the effective neutrino mass if the nuclear matrix element were known. Theoretical calculations are uncertain, and measurements of the occupations of valence orbits by nucleons active in the decay can be important. The occupation of valence neutron orbits in the ground states of {sup 76}Ge (a candidate for such decay) and {sup 76}Se (the daughter nucleus) were determined by precisely measuring cross sections for both neutron-adding and removing transfer reactions. Our results indicate that the Fermi surface is much more diffuse than in theoretical calculations. We find that the populations of at least three orbits change significantly between these two ground states while in the calculations, the changes are confined primarily to one orbit.

Schiffer, J. P.; Gros, S.; Jiang, C. L.; Rehm, K. E. [Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Freeman, S. J.; Fitzpatrick, C. R.; Kay, B. P. [University of Manchester, Manchester M13 9PL (United Kingdom); Clark, J. A.; Deibel, C.; Heinz, A.; Parikh, A.; Parker, P. D.; Werner, V.; Wrede, C. [Yale University, New Haven, Connecticut 06520 (United States); Hirata, D. [GANIL (IN2P3/CNRS -DSM/CEA), B.P. 55027 14076 Caen Cedex 5 (France); Dept. of Physics and Astronomy, Open University, Milton Keynes, MK7 6AA (United Kingdom); Villari, A. C. C. [GANIL (IN2P3/CNRS -DSM/CEA), B.P. 55027 14076 Caen Cedex 5 (France)

2008-03-21T23:59:59.000Z

217

Development and characterization of PCDTBT:CdSe QDs hybrid solar cell  

SciTech Connect (OSTI)

Solar cell consisting of low band gap polymer poly[N-900-hepta-decanyl-2,7-carbazole-alt-5,5-(40,70-di-2-thienyl-20,10, 30-benzothiadiazole)] (PCDTBT) as donor and cadmium selenide/zinc sulphide (CdSe/ZnS) core shell quantum dots (QDs) as an acceptor has been developed. The absorption measurements show that the absorption coefficient increases in bulk heterojunction (BHJ) structure covering broad absorption spectrum (200nm–700nm). Also, the photoluminescence (PL) of the PCDTBT:QDs film is found to decrease by an order of magnitude showing a significant transfer of electrons to the QDs. With this approach and under broadband white light with an irradiance of 8.19 mW/cm{sup 2}, we have been able to achieve a power conversion efficiency (PCE) of 3.1 % with fill factor 0.42 for our typical solar cell.

Dixit, Shiv Kumar, E-mail: shivkumardixit.7@gmail.com; Bhatnagar, Chhavi, E-mail: shivkumardixit.7@gmail.com; Kumari, Anita, E-mail: shivkumardixit.7@gmail.com; Madhwal, Devinder, E-mail: shivkumardixit.7@gmail.com; Bhatnagar, P. K., E-mail: shivkumardixit.7@gmail.com; Mathur, P. C., E-mail: shivkumardixit.7@gmail.com [Department of Electronic Science, University of Delhi South Campus, Benito Juarez Road, New Delhi, 110021 (India)

2014-10-15T23:59:59.000Z

218

Production cross sections of neutron rich isotopes from a 82Se beam  

E-Print Network [OSTI]

Production cross sections for neutron-rich nuclei from the fragmentation of a 82Se beam at 139 MeV/u were measured. The longitudinal momentum distributions of 122 neutron-rich isotopes of elements $11 \\le Z \\le 32$ were determined by varying the target thickness. Production cross sections with beryllium and tungsten targets were determined for a large number of nuclei including several isotopes first observed in this work. These are the most neutron-rich nuclides of the elements $22 \\le Z \\le 25$ (64Ti, 67V, 69Cr, 72Mn). One event was registered consistent with 70Cr, and another one with 75Fe. A one-body Qg systematics is used to describe the production cross sections based on thermal evaporation from excited prefragments. The current results confirm those of our previous experiment with a 76Ge beam: enhanced production cross sections for neutron-rich fragments near Z=20.

Tarasov, O B; Amthor, A M; Bandura, L; Baumann, T; Bazin, D; Berryman, J S; Chubarian, G; Fukuda, N; Gade, A; Ginter, T N; Hausmann, M; Inabe, N; Kubo, T; Pereira, J; Portillo, M; Sherrill, B M; Stolz, A; Sumithrarachchi, C; Thoennessen, M; Weisshaar, D

2012-01-01T23:59:59.000Z

219

Production cross sections of neutron rich isotopes from a 82Se beam  

E-Print Network [OSTI]

Production cross sections for neutron-rich nuclei from the fragmentation of a 82Se beam at 139 MeV/u were measured. The longitudinal momentum distributions of 122 neutron-rich isotopes of elements $11 \\le Z \\le 32$ were determined by varying the target thickness. Production cross sections with beryllium and tungsten targets were determined for a large number of nuclei including several isotopes first observed in this work. These are the most neutron-rich nuclides of the elements $22 \\le Z \\le 25$ (64Ti, 67V, 69Cr, 72Mn). One event was registered consistent with 70Cr, and another one with 75Fe. A one-body Qg systematics is used to describe the production cross sections based on thermal evaporation from excited prefragments. The current results confirm those of our previous experiment with a 76Ge beam: enhanced production cross sections for neutron-rich fragments near Z=20.

O. B. Tarasov; D. J. Morrissey; A. M. Amthor; L. Bandura; T. Baumann; D. Bazin; J. S. Berryman; G. Chubarian; N. Fukuda; A. Gade; T. N. Ginter; M. Hausmann; N. Inabe; T. Kubo; J. Pereira; M. Portillo; B. M. Sherrill; A. Stolz; C. Sumithrarachchi; M. Thoennessen; D. Weisshaar

2012-09-06T23:59:59.000Z

220

Single-step in-situ synthesis and optical properties of ZnSe nanostructured dielectric nanocomposites  

SciTech Connect (OSTI)

This work provides the evidence of visible red photoluminescent light emission from ZnSe nanocrystals (NCs) grown within a dielectric (borosilicate glass) matrix synthesized by a single step in-situ technique for the first time and the NC sizes were controlled by varying only the concentration of ZnSe in glass matrix. The ZnSe NCs were investigated by UV-Vis optical absorption spectroscopy, Raman spectroscopy, and transmission electron microscopy (TEM). The sizes of the ZnSe NCs estimated from the TEM images are found to alter in the range of 2–53?nm. Their smaller sizes of the NCs were also calculated by using the optical absorption spectra and the effective mass approximation model. The band gap enlargements both for carrier and exciton confinements were evaluated and found to be changed in the range of 0–1.0?eV. The Raman spectroscopic studies showed blue shifted Raman peaks of ZnSe at 295 and 315?cm{sup ?1} indicating phonon confinement effect as well as compressive stress effect on the surface atoms of the NCs. Red photoluminescence in ZnSe-glass nanocomposite reveals a broad multiple-peak structure due to overlapping of emission from NC size related electron-hole recombination (?707?nm) and emissions from defects to traps, which were formed due to Se and Zn vacancies signifying potential application in photonics.

Dey, Chirantan; Rahaman Molla, Atiar; Tarafder, Anal; Karmakar, Basudeb, E-mail: basudebk@cgcri.res.in [CSIR-Central Glass and Ceramic Research Institute, Glass Science and Technology Section, Glass Division, 196, Raja S. C. Mullick Road, 700032 Kolkata (India); Kr Mishra, Manish; De, Goutam [CSIR-Central Glass and Ceramic Research Institute, Nano-Structured Materials Division, 196, Raja S. C. Mullick Road, 700032 Kolkata (India); Goswami, Madhumita; Kothiyal, G. P. [Glass and Advanced Ceramics Division, Bhaba Atomic Research Centre, Trombay, 400085 Mumbai (India)

2014-04-07T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" 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

Graphene oxide based CdSe photocatalysts: Synthesis, characterization and comparative photocatalytic efficiency of rhodamine B and industrial dye  

SciTech Connect (OSTI)

Highlights: ? CdSe–graphene is synthesized by hydrothermal method. ? Three molar solutions of CdSe were used making three different composites. ? RhB and Texbrite MST-L were used as sample dye solutions. ? Texbrite MST-L is photo degraded in visible light. ? UV-spectroscopic analysis was done to measure degradation. - Abstract: CdSe–graphene composites were prepared using simple “hydrothermal method” where the graphene surface was modified using different molar solutions of cadmium selenide (CdSe) in aqueous media. The characterization of CdSe–graphene composites were studied by X-ray diffraction (XRD), energy dispersive X-ray (EDX), scanning electron microscope (SEM), and with transmission electron microscope (TEM). The catalytic activities of CdSe-composites were evaluated by degradation of rhodamine B (RhB) and commercial industrial dye “Texbrite MST-L (TXT-MST)” with fixed concentration. The degradation was observed by the decrease in the absorbance peak studied by UV spectrophotometer. The decrease in the dye concentration indicated catalytic degradation effect by CdSe–graphene composites.

Ghosh, Trisha [Department of Advanced Materials Science and Engineering, Hanseo University, Chungnam, 356-706 (Korea, Republic of); Lee, Jeong-Ho [Dasan Linc Educational Development Institute, Dankook University, Cheonan, Chungnam, 330-714 (Korea, Republic of); Meng, Ze-Da; Ullah, Kefayat; Park, Chong-Yeon; Nikam, Vikram [Department of Advanced Materials Science and Engineering, Hanseo University, Chungnam, 356-706 (Korea, Republic of); Oh, Won-Chun, E-mail: wc_oh@hanseo.ac.kr [Department of Advanced Materials Science and Engineering, Hanseo University, Chungnam, 356-706 (Korea, Republic of)

2013-03-15T23:59:59.000Z

222

Green route synthesis of high quality CdSe quantum dots for applications in light emitting devices  

SciTech Connect (OSTI)

Investigation was made on light emitting diodes fabricated using CdSe quantum dots. CdSe quantum dots were synthesized chemically using olive oil as the capping agent, instead of toxic phosphine. Room temperature photoluminescence investigation showed sharp 1st excitonic emission peak at 568 nm. Bi-layer organic/inorganic (P3HT/CdSe) hybrid light emitting devices were fabricated by solution process. The electroluminescence study showed low turn on voltage ({approx}2.2 V) .The EL peak intensity was found to increase by increasing the operating current. - Graphical abstract: Light emitting diode was fabricated using CdSe quantum dots using olive oil as the capping agent, instead of toxic phosphine. Bi-layer organic/inorganic (P3HT/CdSe) hybrid light emitting device shows strong electroluminescence in the range 630-661 nm. Highlights: Black-Right-Pointing-Pointer CdSe Quantum dots were synthesized using olive oil as the capping agent. Black-Right-Pointing-Pointer Light emitting device was fabricated using CdSe QDs/P3HT polymer heterojunction. Black-Right-Pointing-Pointer The I-V characteristics study showed low turn on voltage at {approx}2.2 V. Black-Right-Pointing-Pointer The EL peak intensity increases with increasing the operating current.

Bera, Susnata, E-mail: susnata.bera@gmail.com [Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, Kharagpur 721302 (India); Singh, Shashi B. [Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, Kharagpur 721302 (India); Ray, S.K., E-mail: physkr@phy.iitkgp.ernet.in [Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, Kharagpur 721302 (India)

2012-05-15T23:59:59.000Z

223

The synthesis, single-crystal structure, optical absorption, and resistivity of Th{sub 2}GeSe{sub 5}  

SciTech Connect (OSTI)

The compound Th{sub 2}GeSe{sub 5} has been synthesized by the reaction of the elements at 1273 K. From a single-crystal study Th{sub 2}GeSe{sub 5} crystallizes in the Ba{sub 5}Si{sub 3} structure type with four formula units in the space group D{sup 8}{sub 4h}?P4/ncc of the tetragonal system in a cell with dimensions a=7.4968(4) Å and c=13.6302(9) Å at 100(2) K. From optical absorption measurements Th{sub 2}GeSe{sub 5} is found to have an optical band gap of 1.92 eV (indirect) or 1.98 eV (direct), consistent with its red color. Th{sub 2}GeSe{sub 5} is a wide gap semiconductor, as indicated by its electrical resistivity at 298 K of 4.37(2)×10{sup 9} ? cm measured on a single crystal. - Graphical abstract: The structure of Th{sub 2}GeSe{sub 5}. Display Omitted - Highlights: • The new compound Th{sub 2}GeSe{sub 5} was synthesized from the elements and recrystallized from Sb{sub 2}Se{sub 3}. • Th{sub 2}GeSe{sub 5} crystallizes in the Ba{sub 5}Si{sub 3} structure type. • The band gap of Th{sub 2}GeSe{sub 5} is1.92 eV and its resistivity shows it to be a wide gap semiconductor.

Koscielski, Lukasz A.; Malliakas, Christos D.; Sarjeant, Amy A.; Ibers, James A., E-mail: ibers@chem.northwestern.edu

2013-09-15T23:59:59.000Z

224

Investigation into the growth and structure of thin-film solid solutions of iron-based superconductors in the FeSe{sub 0.92}-FeSe{sub 0.5}Te{sub 0.5} system  

SciTech Connect (OSTI)

Thin films of FeSe{sub 0.92} and FeSe{sub 0.5}Te{sub 0.5} iron chalcogenide superconductors and solid solutions containing these components in different ratios have been grown on the surface of LaAlO{sub 3} (10 1-bar 2) crystals by pulsed laser deposition. Films of solid solutions have been deposited by simultaneous laser ablation from two targets of the FeSe{sub 0.92} and FeSe{sub 0.5}Te{sub 0.5} stoichiometric compositions onto one substrate. An X-ray diffraction study of the film structure shows that the films grown are epitaxial and their lattice parameters regularly vary with the ratio of the deposited components, which was controllably varied by changing the ablation intensities from the targets.

Stepantsov, E. A., E-mail: stepantsov@ns.cryst.ras.ru [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation); Kazakov, S. M.; Belikov, V. V. [Moscow State University (Russian Federation)] [Moscow State University (Russian Federation); Makarova, I. P. [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)] [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation); Arpaia, R.; Gunnarsson, R.; Lombardi, F. [Chalmers University of Technology, Department of Microtechnology and Nanoscience (Sweden)] [Chalmers University of Technology, Department of Microtechnology and Nanoscience (Sweden)

2013-09-15T23:59:59.000Z

225

Magnetic field induced third order susceptibility of third order harmonic generation in a ZnMgSe strained quantum well  

SciTech Connect (OSTI)

Third order susceptibility of third order harmonic generation is investigated in a Zn{sub 0.1}Mg{sub 0.9}Se/Zn{sub 0.8}Mg{sub 0.2}Se/Zn{sub 0.1}Mg{sub 0.9}Se quantum well in the presence of magnetic field strength. The confinement potential is considered as the addition of energy offsets of the conduction band (or valence band) and the strain-induced potential in our calculations. The material dependent effective mass is followed throughout the computation because it has a high influence on the electron energy levels in low dimensional semiconductor systems.

Mark, J. Abraham Hudson, E-mail: a.john.peter@gmail.com; Peter, A. John, E-mail: a.john.peter@gmail.com [Dept. of Physics, SSM Institute of Engineering and Technology, Dindigul-624002 (India)

2014-04-24T23:59:59.000Z

226

CdSe/CdTe type-II superlattices grown on GaSb (001) substrates by molecular beam epitaxy  

SciTech Connect (OSTI)

CdSe/CdTe superlattices are grown on GaSb substrates using molecular beam epitaxy. X-ray diffraction measurements and cross-sectional transmission electron microscopy images indicate high crystalline quality. Photoluminescence (PL) measurements show the effective bandgap varies with the superlattice layer thicknesses and confirm the CdSe/CdTe heterostructure has a type-II band edge alignment. The valence band offset between unstrained CdTe and CdSe is determined as 0.63 {+-} 0.06 eV by fitting the measured PL peak positions using the envelope function approximation and the Kronig-Penney model. These results suggest that CdSe/CdTe superlattices are promising candidates for multi-junction solar cells and other optoelectronic devices based on GaSb substrates.

Li Jingjing; Liu Shi; Wang Shumin; Ding Ding; Johnson, Shane R.; Zhang Yonghang [Center for Photonics Innovation, Arizona State University, Tempe, Arizona 85287 (United States); School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287 (United States); Liu Xinyu; Furdyna, Jacek K. [Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States); Smith, David J. [Center for Photonics Innovation, Arizona State University, Tempe, Arizona 85287 (United States); Department of Physics, Arizona State University, Tempe, Arizona 85287 (United States)

2012-03-19T23:59:59.000Z

227

Auger recombination and intraband absorption of two-photon-excited carriers in colloidal CdSe quantum dots  

E-Print Network [OSTI]

Se quantum dots Yingli Qu and Wei Jia Department of Physics, National University of Singapore, Singapore 117542, Republic of Singapore Yuangang Zheng and Jackie Y. Ying Institute of Bioengineering

Wei, Ji

228

Charge Density Waves in Exfoliated Films of van der Waals Materials: Evolution of Raman Spectrum in TiSe2  

E-Print Network [OSTI]

Charge Density Waves in Exfoliated Films of van der Waals Materials: Evolution of Raman Spectrum graphene-like mechanical exfoliation of TiSe2 crystals to prepare a set of films with different thicknesses

229

Search for neutrinoless double beta decay of ¹¹?Cd and ?²Se and calorimeter simulations for the SuperNEMO experiment.  

E-Print Network [OSTI]

??Using the NEMO-3 detector, 410.4 g of ¹¹?Cd with a total exposure of 1.65 kg• y and 932 g of ?²Se with a total exposure… (more)

Liptak, Zachary John

2014-01-01T23:59:59.000Z

230

Epitaxial growth of Cu,,In,Ga...Se2 on GaAs,,110... and A. Rockett  

E-Print Network [OSTI]

. INTRODUCTION The Cu(In, Ga)Se2 CIGS absorber layer in a recent record-efficiency CIGS solar cell1 has a 220.13 Commercially supplied ``epi-ready'' liquid- encapsulated Czo

Rockett, Angus

231

Expanded Prussian Blue Analogues Incorporating [Re6Se8(CN)6]3-/4-Clusters: Adjusting Porosity via Charge Balance  

E-Print Network [OSTI]

Expanded Prussian Blue Analogues Incorporating [Re6Se8(CN)6]3-/4- Clusters: Adjusting Porosity via of octahedral [M(CN)6]3-/4- complexes for the synthesis of microporous Prussian blue type solids with adjustable to be a direct expansion of Prussian blue (Fe4[Fe(CN)6]3,14H2O), with [Re6Se8(CN)6]4- clusters connected through

Shores, Matthew P.

232

Materials Science and Engineering A303 (2001) 1923 DC electrochemical deposition of CdSe nanorods array using  

E-Print Network [OSTI]

was then exposed to a saturated HgCl2 solution for 1 h, the oxide section separated from the aluminum sub- strate reagent [17]. In this paper, we prepared CdSe nanorods in the aqueous solution containing CdSO4 ­H2SeO3 the native oxide and washes thoroughly with distilled water, then electropolished in a mixed solution of HCl

Gao, Hongjun

233

Environmental, health and safety issues related to commercializing CuInSe{sub 2}-based photovoltaics  

SciTech Connect (OSTI)

Photovoltaics technology is rapidly evolving towards a new generation of low-cost thin film technologies. One of the most promising materials in this new generation is copper indium selenide (CuInSe{sub 2} or CIS). As with any new material, successful commercialization of CIS photovoltaic (PV) technology will require attention to environmental, health and safety issues, including consideration of the sources, usage, and end-of-product-life disposal and/or recycling of the constituent materials. This work focuses on three specific environmental, health and safety (EH and S) issues related to CIS PV: (1) economics are analyzed to determine their impact on materials use and re-use; (2) Federal and California State environmental disposal and waste handling regulations are analyzed to evaluate their impact on PV module manufacturing and end-of-life module handling; and (3) the logistics and economics of product recycling and waste disposal by industries with comparable EH and S issues are examined to quantify the corresponding options available for handling, disposing of and/or recycling manufacturing by-products and end-of-life modules.

Eberspacher, C. [UNISUN, Newbury Park, CA (United States); Fthenakis, V.M.; Moskowtiz, P.D. [Brookhaven National Lab., Upton, NY (United States)

1996-07-01T23:59:59.000Z

234

Air quality investigations of the Sandia National Laboratories Sol se Mete Aerial Cable Facility  

SciTech Connect (OSTI)

The air quality implications of the test and evaluation activities at the Sandia National Laboratories Sol se Mete Aerial Cable Facility are examined. All facets of the activity that affect air quality are considered. Air contaminants produced directly include exhaust products of rocket motors used to accelerate test articles, dust and gas from chemical explosives, and exhaust gases from electricity generators in the test arenas. Air contaminants produced indirectly include fugitive dust and exhaust contaminants from vehicles used to transport personnel and material to the test area, and effluents produced by equipment used to heat the project buildings. Both the ongoing program and the proposed changes in the program are considered. Using a reliable estimate of th maximum annual testing level, the quantities of contaminants released by project activities ar computed either from known characteristics of test items or from EPA-approved emission factors Atmospheric concentrations of air contaminants are predicted using EPA dispersion models. The predicted quantities and concentrations are evaluated in relation to Federal, New Mexico, an Bernalillo County air quality regulations and the human health and safety standards of the American Conference of Governmental Industrial Hygienists.

Gutman, W.M.; Silver, R.J. [New Mexico State Univ., Las Cruces, NM (United States). Physical Science Lab.

1994-12-01T23:59:59.000Z

235

Performance Characterization and Remedy of Experimental CuInGaSe2 Mini-Modules: Preprint  

SciTech Connect (OSTI)

We employed current-voltage (I-V), quantum efficiency (QE), photoluminescence (PL), electroluminescence (EL), lock-in thermography (LIT), and (electrochemical) impedance spectroscopy (ECIS) to complementarily characterize the performance and remedy for two pairs of experimental CuInGaSe2 (CIGS) mini-modules. One pair had the three scribe-lines (P1/P2/P3) done by a single pulse-programmable laser, and the other had the P2/P3 lines by mechanical scribe. Localized QE measurements for each cell strip on all four mini-modules showed non-uniform distributions that correlated well with the presence of performance-degrading strips or spots revealed by PL, EL, and LIT imaging. Performance of the all-laser-scribed mini-modules improved significantly by adding a thicker Al-doped ZnO layer and reworking the P3 line. The efficiency on one of the all-laser-scribed mini-modules increased notably from 7.80% to 8.56% after the performance-degrading spots on the side regions along the cell array were isolated by manual scribes.

Pern, F. J.; Yan, F.; Mansfield, L.; Glynn, S.; Rekow, M.; Murion, R.

2011-07-01T23:59:59.000Z

236

Optical phonons and the soft mode in 2H-NbSe2  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

We present an investigation of the lattice dynamics of the charge density wave (CDW) compound 2H-NbSe2. We analyze the precise nature of the wave vector-dependent electron-phonon coupling (EPC) and derive the bare dispersion of the CDW soft phonon mode using inelastic x-ray scattering combined with ab initio calculations. Experimentally, phonon modes along the ??M line, i.e., q = (h,0,0), with 0 ? h ? 0.5 and the same longitudinal symmetry (?1) as the CDW soft mode, were investigated up to 32 meV. In agreement with our calculations, we observe significant EPC in the optic modes at h ? 0.2. We analyze the EPC in the optic, as well as acoustic, mode and show that the q dependences stem from scattering processes between two bands at the Fermi surface that both have a Nb 4d character. Finally, we demonstrate that the soft mode dispersion at T = 33 K (=TCDW) can be well described on the basis of a strongly q-dependent EPC matrix element and an acousticlike bare phonon dispersion in agreement with observations near room temperature.

Weber, F.; Hott, R.; Heid, R.; Bohnen, K.-P.; Rosenkranz, S.; Castellan, J.-P.; Osborn, R.; Said, A. H.; Leu, B. M.; Reznik, D.

2013-06-01T23:59:59.000Z

237

Subdiffraction, Luminescence-Depletion Imaging of Isolated, Giant, CdSe/CdS Nanocrystal Quantum Dots  

SciTech Connect (OSTI)

Subdiffraction spatial resolution luminescence depletion imaging was performed with giant CdSe/14CdS nanocrystal quantum dots (g-NQDs) dispersed on a glass slide. Luminescence depletion imaging used a Gaussian shaped excitation laser pulse overlapped with a depletion pulse, shaped into a doughnut profile, with zero intensity in the center. Luminescence from a subdiffraction volume is collected from the central portion of the excitation spot, where no depletion takes place. Up to 92% depletion of the luminescence signal was achieved. An average full width at half-maximum of 40 ± 10 nm was measured in the lateral direction for isolated g-NQDs at an air interface using luminescence depletion imaging, whereas the average full width at half-maximum was 450 ± 90 nm using diffraction-limited, confocal luminescence imaging. Time-gating of the luminescence depletion data was required to achieve the stated spatial resolution. No observable photobleaching of the g-NQDs was present in the measurements, which allowed imaging with a dwell time of 250 ms per pixel to obtain images with a high signal-to-noise ratio. The mechanism for luminescence depletion is likely stimulated emission, stimulated absorption, or a combination of the two. The g-NQDs fulfill a need for versatile, photostable tags for subdiffraction imaging schemes where high laser powers or long exposure times are used.

Lesoine, Michael D. [Ames Laboratory; Bhattacharjee, Ujjal [Ames Laboratory; Guo, Yijun [Ames Laboratory; Vela, Javier [Ames Laboratory; Petrich, Jacob W. [Ames Laboratory; Smith, Emily A. [Ames Laboratory

2013-01-18T23:59:59.000Z

238

Demonstrations of diode-pumped and grating-tuned ZnSe:Cr{sup 2+} lasers  

SciTech Connect (OSTI)

Within the last few years, divalent-transition-metal-doped II-VI material class has been proposed as source of new tunable mid-IR lasers. Cr{sup 2+} is a prime laser candidate on account of its high luminescence quantum yield and the expectation that ESA would be absent. The first ZnSe:Cr{sup 2+} laser demonstrations were conducted in an end-pumped geometry with a tightly focused (0.2 mm spot) MgF{sub 2}-Co{sup 2+} laser beam, for a peak pump intensity well over 100 kW/cm{sup 2}, so laser threshold was easily reached. Grating tuning experiments were done by replacing the cavity high-reflector with a diffraction grating. The diode array was removed and pump beam from a MgF{sub 2}:Co{sup 2+} laser was focused onto the crystal using the same cylindrical lens. Output wavelengths were checked with a monochromator. The long-wavelength limit of operation was 2799 nm. Short-wavelength cutoff was 2134 nm; even though the emission cross section remains substantial, self-absorption inhibits laser operation.

Page, R.H.; Skidmore, J.A.; Schaffers, K.I.; Beach, R.J.; Payne, S.A.; Krupke, W.F.

1996-09-01T23:59:59.000Z

239

Determination of Grain Boundary Charging in Cu(In,Ga)Se2 Thin Films: Preprint  

SciTech Connect (OSTI)

Surface potential mapping of Cu(In,Ga)Se2 (CIGS) thin films using scanning Kelvin probe force microscopy (SKPFM) aims to understand the minority-carrier recombination at the grain boundaries (GBs) of this polycrystalline material by examining GB charging, which has resulted in a number of publications. However, the reported results are highly inconsistent. In this paper, we report on the potential mapping by measuring wide-bandgap or high-Ga-content films and by using a complementary atomic force microscopy-based electrical technique of scanning capacitance microscopy (SCM). The results demonstrate consistent, positively charged GBs on our high-quality films with minimal surface defects/charges. The potential image taken on a low-quality film with a 1.2-eV bandgap shows significantly degraded potential contrast on the GBs and degraded potential uniformity on grain surfaces, resulting from the surface defects/charges of the low-quality film. In contrast, the potential image on an improved high-quality film with the same wide bandgap shows significantly improved GB potential contrast and surface potential uniformity, indicating that the effect of surface defects is critical when examining GB charging using surface potential data. In addition, we discuss the effect of the SKPFM setup on the validity of potential measurement, to exclude possible artifacts due to improper SKPFM setups. The SKPFM results were corroborated by using SCM measurements on the films with a CdS buffer layer. The SCM image shows clear GB contrast, indicating different electrical impedance on the GB from the grain surface. Further, we found that the GB contrast disappeared when the CdS window layer was deposited after the CIGS film was exposed extensively to ambient, which was caused by the creation of CIGS surface defects by the ambient exposure.

Jiang, C. S.; Contreras, M. A.; Repins, I.; Moutinho, H. R.; Noufi, R.; Al-Jassim, M. M.

2012-06-01T23:59:59.000Z

240

Thermodynamic model for the solubility of BaSeO4(cr) in the aqueous Ba2+-SeO42--Na+-H+-OH--H2O system: Extending to high selenate concentrations  

SciTech Connect (OSTI)

The solubility of Ba(SeO4, SO4) precipitates was determined as a function of the BaSeO4 mole fractions, ranging from 0.0015 to 0.3830, and time with an equilibration period extending to as long as 302 days. Equilibrium/steady state conditions in this system are reached in ? 65 days. Pitzer’s ion interaction model was used to calculate solid and aqueous phase activity coefficients. Thermodynamic analyses showed that the data do not satisfy Gibbs-Duhem equation, thereby demonstrating that a single-solid solution phase does not control both the selenate and sulfate concentrations. Our extensive data with log10 [Ba]) ranging from -3.6 to -5.9 mol.kg-1, log10 [SeO4]) ranging from -3.6 to -5.2 mol.kg-1, and log10 [SO4] ranging from -4.0 to -5.3 mol.kg-1 can be explained with the formation of an ideal BaSeO4 solid solution phase that controls the selenium concentrations and a slightly disordered/less-crystalline BaSO4(s) (log10 K0sp = -9.5 instead of -10.05 for barite) that controls the sulfate concentrations. In these experiments the BaSO4 component of the solid solution phase never reaches thermodynamic equilibrium with the aqueous phase. Thermodynamic interpretations of the data show that both the ideal BaSeO4 solid solution phase and less-crystalline BaSO4(s) phase are in equilibrium with each other in the entire range of BaSeO4 mole fractions investigated in this study.

Rai, Dhanpat; Felmy, Andrew R.; Moore, Dean A.; Kitamura, Akira; Yoshikawa, Hideki; Doi, Reisuke; Yoshida, Yasushi

2014-09-15T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" 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

Synthesis of Bi{sub 2}Se{sub 3} thermoelectric nanosheets and nanotubes through hydrothermal co-reduction method  

SciTech Connect (OSTI)

Bi{sub 2}Se{sub 3} nanosheets and nanotubes were prepared by a hydrothermal co-reduction method at 150, 180, 200, and 210{sup o}C. Bi{sub 2}Se{sub 3} nanosheets, nanobelts and nanotubes were obtained. The Bi{sub 2}Se{sub 3} nanoflakes are 50-500nm in width and 2-5nm in thickness. The Bi{sub 2}Se{sub 3} nanotubes are 5-10nm in diameter, 80-120nm in length, and 1.3nm in wall thickness. X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, and electron diffraction were employed to characterize the products. Experimental results showed that the nanosheets and the nanotubes are hexagonal in structure with a=4.1354A and c=27.4615A. A possible formation and crystal growth mechanism of Bi{sub 2}Se{sub 3} nanostructures is proposed.

Cui Hongmei [State Key Laboratory of Crystal Materials, Shandong University, 27 Shanda Nanlu, Jinan City, Shandong Province 250100 (China); Liu Hong [State Key Laboratory of Crystal Materials, Shandong University, 27 Shanda Nanlu, Jinan City, Shandong Province 250100 (China)]. E-mail: hongliu@sdu.edu.cn; Li Xia [State Key Laboratory of Crystal Materials, Shandong University, 27 Shanda Nanlu, Jinan City, Shandong Province 250100 (China); Wang Jiyang [State Key Laboratory of Crystal Materials, Shandong University, 27 Shanda Nanlu, Jinan City, Shandong Province 250100 (China)]. E-mail: jywang@icm.sdu.edu.cn; Han Feng [State Key Laboratory of Crystal Materials, Shandong University, 27 Shanda Nanlu, Jinan City, Shandong Province 250100 (China); Zhang Xudong [State Key Laboratory of Crystal Materials, Shandong University, 27 Shanda Nanlu, Jinan City, Shandong Province 250100 (China); Boughton, R.I. [Department of Physics and Astronomy, Bowling Green State University, Bowling Green, OH 43403 (United States)

2004-11-01T23:59:59.000Z

242

Syntheses, crystal structures, and properties of three new metal selenites Na{sub 2}Co{sub 2}(SeO{sub 3}){sub 3}, Na{sub 2}Co{sub 1.67}Ni{sub 0.33}(SeO{sub 3}){sub 3}, and Na{sub 2}Ni{sub 2}(SeO{sub 3}){sub 3}  

SciTech Connect (OSTI)

Three new sodium cobalt (nickel) selenite compounds, namely, Na{sub 2}Co{sub 2}(SeO{sub 3}){sub 3}, Na{sub 2}Co{sub 1.67}Ni{sub 0.33}(SeO{sub 3}){sub 3}, and Na{sub 2}Ni{sub 2}(SeO{sub 3}){sub 3} have been hydro-/solvothermally synthesized in the mixed solvents of acetonitrile and water. Single-crystal X-ray diffraction analyses reveal that these isostructural compounds belong to the orthorhombic Cmcm space group and their structures feature three-dimensional open frameworks constructed by the two-dimensional layers of [MSeO{sub 3}] pillared by the [SeO{sub 3}]{sup 2-} groups. The two different types of Na{sup +} ions reside in the intersecting two-dimensional channels parallel to the a- and c-axes, respectively. Their thermal properties have been investigated via TGA-DSC. The magnetic measurements indicate the existence of the antiferromagnetic interactions in these compounds. - Graphical abstract: Three new isostructural metal selenites, Na{sub 2}Co{sub 2}(SeO{sub 3}){sub 3}, Na{sub 2}Co{sub 1.67}Ni{sub 0.33}(SeO{sub 3}){sub 3}, and Na{sub 2}Ni{sub 2}(SeO{sub 3}){sub 3} have been hydro-/solvothermally synthesized and characterized. Their structures feature three-dimensional open frameworks with Na{sup +}-occupied channels.

Yuan Xiaoqing [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China); Graduate School of the Chinese Academy of Sciences, Beijing 100049 (China); Feng Meiling, E-mail: fml@fjirsm.ac.c [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, the Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China); Li Jianrong [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, the Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China); Graduate School of the Chinese Academy of Sciences, Beijing 100049 (China); Huang Xiaoying, E-mail: xyhuang@fjirsm.ac.c [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China)

2010-09-15T23:59:59.000Z

243

Photoconductivity and luminescence of CuInSe{sub 2} single crystals at a high level of optical excitation  

SciTech Connect (OSTI)

The luminance-current and spectral characteristics of photoluminescence of the CuInSe{sub 2} single crystals are studied. The superlinear portion of the excitation-intensity dependence of photoconductivity at low excitation intensities in compensated p-CuInSe{sub 2} crystals is explained on the basis of a recombination model. The emission band that peaked at 0.98 eV in the n-CuInSe{sub 2} photoluminescence spectrum corresponds to radiative recombination of electrons at the donor level with a depth of 0.04 eV. The maximum in the band intensity corresponds to the energy gap between the trap level and the valence band.

Guseinov, A. G.; Salmanov, V. M.; Mamedov, R. M. [Baku State University (Azerbaijan)], E-mail: rovshan63@rambler.ru

2006-04-15T23:59:59.000Z

244

Syntheses, structures, and properties of Ag{sub 4}(Mo{sub 2}O{sub 5})(SeO{sub 4}){sub 2}(SeO{sub 3}) and Ag{sub 2}(MoO{sub 3}){sub 3}SeO{sub 3}  

SciTech Connect (OSTI)

Ag{sub 4}(Mo{sub 2}O{sub 5})(SeO{sub 4}){sub 2}(SeO{sub 3}) has been synthesized by reacting AgNO{sub 3}, MoO{sub 3}, and selenic acid under mild hydrothermal conditions. The structure of this compound consists of cis-MoO{sub 2} {sup 2+} molybdenyl units that are bridged to neighboring molybdenyl moieties by selenate anions and by a bridging oxo anion. These dimeric units are joined by selenite anions to yield zigzag one-dimensional chains that extended down the c-axis. Individual chains are polar with the C {sub 2} distortion of the Mo(VI) octahedra aligning on one side of each chain. However, the overall structure is centrosymmetric because neighboring chains have opposite alignment of the C {sub 2} distortion. Upon heating Ag{sub 4}(Mo{sub 2}O{sub 5})(SeO{sub 4}){sub 2}(SeO{sub 3}) looses SeO{sub 2} in two distinct steps to yield Ag{sub 2}MoO{sub 4}. Crystallographic data: (193 K; MoK{alpha}, {lambda}=0.71073 A): orthorhombic, space group Pbcm, a=5.6557(3), b=15.8904(7), c=15.7938(7) A, V=1419.41(12), Z=4, R(F)=2.72% for 121 parameters with 1829 reflections with I>2{sigma}(I). Ag{sub 2}(MoO{sub 3}){sub 3}SeO{sub 3} was synthesized by reacting AgNO{sub 3} with MoO{sub 3}, SeO{sub 2}, and HF under hydrothermal conditions. The structure of Ag{sub 2}(MoO{sub 3}){sub 3}SeO{sub 3} consists of three crystallographically unique Mo(VI) centers that are in 2+2+2 coordination environments with two long, two intermediate, and two short bonds. These MoO{sub 6} units are connected to form a molybdenyl ribbon that extends along the c-axis. These ribbons are further connected together through tridentate selenite anions to form two-dimensional layers in the [bc] plane. Crystallographic data: (193 K; MoK{alpha}, {lambda}=0.71073 A): monoclinic, space group P2{sub 1} /n, a=7.7034(5), b=11.1485(8), c=12.7500(9) A, {beta}=105.018(1) V=1002.7(2), Z=4, R(F)=3.45% for 164 parameters with 2454 reflections with I>2{sigma}(I). Ag{sub 2}(MoO{sub 3}){sub 3}SeO{sub 3} decomposes to Ag{sub 2}Mo{sub 3}O{sub 10} on heating above 550 deg. C. - Graphical abstract: A view of the one-dimensional [(Mo{sub 2}O{sub 5})(SeO{sub 4}){sub 2}(SeO{sub 3})]{sup 4-} chains that extend down the c-axis in the structure of Ag{sub 4}(Mo{sub 2}O{sub 5})(SeO{sub 4}){sub 2}(SeO{sub 3})

Ling Jie [Department of Chemistry and Biochemistry, 179 Chemistry Building, Auburn University, Auburn, AL 36849 (United States); Albrecht-Schmitt, Thomas E. [Department of Chemistry and Biochemistry, 179 Chemistry Building, Auburn University, Auburn, AL 36849 (United States)], E-mail: albreth@auburn.edu

2007-05-15T23:59:59.000Z

245

Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3  

SciTech Connect (OSTI)

Using femtosecond time- and angle-resolved photoemission spectroscopy, we investigated the nonequilibrium dynamics of the topological insulator Bi{sub 2}Se{sub 3}. We studied p-type Bi{sub 2}Se{sub 3}, in which the metallic Dirac surface state and bulk conduction bands are unoccupied. Optical excitation leads to a meta-stable population at the bulk conduction band edge, which feeds a nonequilibrium population of the surface state persisting for >10 ps. This unusually long-lived population of a metallic Dirac surface state with spin texture may present a channel in which to drive transient spin-polarized currents.

Sobota, Jonathan

2012-03-14T23:59:59.000Z

246

Enhancement of surface phonon modes in the Raman spectrum of ZnSe nanoparticles on adsorption of 4-mercaptopyridine  

SciTech Connect (OSTI)

By chemically etching a thin film of crystalline ZnSe with acid, we observe a strong Raman enhancement of the surface phonon modes of ZnSe on adsorption of a molecule (4-mercaptopyridine). The surface is composed of oblate hemi-ellipsoids, which has a large surface-to-bulk ratio. The assignment of the observed modes (at 248 and 492 cm{sup ?1}) to a fundamental and first overtone of the surface optical mode is consistent with observations from high-resolution electron energy loss spectroscopy as well as calculations.

Islam, Syed K.; Lombardi, John R. [Department of Chemistry, The City College of New York, New York, New York 10031 (United States)] [Department of Chemistry, The City College of New York, New York, New York 10031 (United States)

2014-02-21T23:59:59.000Z

247

Specific features of self-compensation in Er{sub x}Sn{sub 1-x}Se solid solutions  

SciTech Connect (OSTI)

The effect of doping and degree of compensation on the conductivity activation energy {Delta}E{sub i} in Er{sub x}Sn{sub 1-x}Se has been investigated. The carrier concentration decreases at a low doping level in the case of low and moderate compensations. It is found that, beginning with x {>=} 0.005 at % Er, carriers in the solid solutions under study change sign, depending on the amount of substituted erbium in the SnSe samples that is in equilibrium with the selenium phase. This phenomenon can be explained in terms of the concepts of the self-compensation of donors in the Sn sublattice.

Huseynov, J. I., E-mail: cih_58@mail.ru; Murguzov, M. I.; Ismayilov, Sh. S. [Azerbaijan State Pedagogical University (Azerbaijan)

2013-03-15T23:59:59.000Z

248

Growth and structure of epitaxial Pb{sub 1-x}Mn{sub x}Se(Ga) films  

SciTech Connect (OSTI)

The growth and structure of Pb{sub 1-x}Mn{sub x}Se (Ga) (N{sub Ga} = 0.8 at %) films with thicknesses of 0.3-0.5 {mu}m, grown on single-crystal PbSe{sub 1-x}S{sub x} (100) substrates by molecular-beam epitaxy, have been studied. It is established that films grow in a face-centered cubic lattice with the (100) orientation, reproducing the substrate orientation. The optimal conditions for obtaining photosensitive epitaxial films with perfect crystal structure are determined (W{sub 1/2} = 70-80'').

Nuriyev, I. R., E-mail: mhagiyev@yahoo.com; Gadzhiyev, M. B.; Sadigov, R. M. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2009-03-15T23:59:59.000Z

249

H-bond network dynamics of the solid-state protonic conductor Rb3H(SeO4)2 from FTIR and IINS measurements  

E-Print Network [OSTI]

that the identified modes (m1[SeO4]2À , m1[HSeO4]1À , m3[SeO4]2À and m3[HSeO4]1À ) can be classified in two groups: alternation between the association of the monomers [HSeO4]1À and [SeO4]2À resulting in the dimer [H(SeO4)2]3À

Schuck, Götz

250

Chemical order in Ge{sub x}As{sub y}Se{sub 1-x-y} glasses probed by high resolution X-ray photoelectron spectroscopy  

SciTech Connect (OSTI)

We have measured high-resolution x-ray photoelectron spectra of Ge{sub x}As{sub y}Se{sub 1-x-y} glasses with a mean coordination number (MCN) from 2.2 to 2.78. The valence band spectra showed that a number of Se–Se–Se trimers can be found in Se-rich samples, whilst multiband features induced by phase separation can be observed in extremely Se-poor samples. When the Ge, As, and Se 3d spectra were decomposed into several doublets, which correspond, respectively, to different chemical environments, the perfect AsSe{sub 3/2} pyramidal and GeSe{sub 4/2} tetrahedral structures in Se-rich samples gradually evolved into defect structures, including As–As and Ge–Ge homopolar bonds, with increasing Ge and As concentrations. Two transition-like features were found at MCN?=?2.5 and 2.64–2.72 that correspond first to the disappearance of Se-chains in the glass network and, subsequently, destruction of the perfect GeSe{sub 4/2} tetrahedral structures, respectively.

Xu, S. W. [Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200 (Australia); College of Applied Sciences, Beijing University of Technology, Beijing100124 (China); Wang, R. P.; Luther-Davies, B. [Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200 (Australia); Kovalskiy, A. [Department of Physics and Astronomy, Austin Peay State University, Clarksville, Tennessee 37043 (United States); Miller, A. C.; Jain, H. [Department of Materials Science and Engineering, Lehigh University, 5 East Packer Avenue, Bethlehem, Pennsylvania 18015-3195 (United States)

2014-02-28T23:59:59.000Z

251

Photoemission Spectroscopy of Magnetic and Nonmagnetic Impurities on the Surface of the Bi2Se3 Topological Insulator  

E-Print Network [OSTI]

Topological Insulator T. Valla,1,* Z.-H. Pan,1 D. Gardner,2 Y. S. Lee,2 and S. Chu3 1 Condensed Matter Physics; published 12 March 2012) Dirac-like surface states on surfaces of topological insulators have a chiral spin impurities on the surface of Bi2Se3, a model topological insulator. We reveal a remarkable insensitivity

Ohta, Shigemi

252

Temperature dependent Raman scattering studies of three dimensional topological insulators Bi{sub 2}Se{sub 3}  

SciTech Connect (OSTI)

We investigate the temperature dependent (83?K?T?523?K) frequency shift of 2A{sub g}{sup 1} and 1E{sub g}{sup 2} phonon modes in the three dimensional topological insulator Bi{sub 2}Se{sub 3}, using Raman spectroscopy. The high quality single crystals of Bi{sub 2}Se{sub 3} were grown using a modified Bridgman technique and characterized by Laue diffraction and high resolution transmission electron microscopy. A significant broadening in the line shape and red-shift in the frequencies were observed with increase in temperature. Polarized Raman scattering measurement shows a strong polarization effect of A{sub g}{sup 1} and A{sub g}{sup 2} phonon modes which confirms the good quality single crystals of Bi{sub 2}Se{sub 3}. Temperature co-efficient for A{sub 1g}{sup 1},?E{sub g}{sup 2}, and A{sub 1g}{sup 2} modes was estimated to be ?1.44?×?10{sup ?2}, ?1.94?×?10{sup ?2}, and ?1.95?×?10{sup ?2}?cm{sup ?1}?K, respectively. Our results shed light on anharmonic properties of Bi{sub 2}Se{sub 3}.

Irfan, Bushra; Chatterjee, Ratnamala, E-mail: rmala@physics.iitd.ac.in [Department of Physics, Indian Institute of Technology Delhi (IITD), New Delhi 110016 (India); Sahoo, Satyaprakash; Gaur, Anand P. S.; Ahmadi, Majid; Katiyar, Ram S. [Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, Puerto Rico 00931 (United States); Guinel, Maxime J.-F. [Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, Puerto Rico 00931 (United States); Department of Chemistry, College of Natural Sciences, University of Puerto Rico, P.O. Box 70377, San Juan, Puerto Rico 00936-8377 (United States)

2014-05-07T23:59:59.000Z

253

PHYSICAL REVIEW B 83, 165440 (2011) Electron interaction-driven insulating ground state in Bi2Se3 topological insulators  

E-Print Network [OSTI]

topological insulators in the two-dimensional limit Minhao Liu,1 Cui-Zu Chang,1,2 Zuocheng Zhang,1 Yi Zhang,2 of ultrathin Bi2Se3 topological insulators with thickness from one quintuple layer to six quintuple layers that this unusual insulating ground state in the two-dimensional limit of topological insulators is induced

Wang, Wei Hua

2011-01-01T23:59:59.000Z

254

CdSe-MoS2: A Quantum Size-Confined Photocatalyst for Hydrogen Evolution from Water under Visible Light  

E-Print Network [OSTI]

and for the conversion of carbon dioxides into methanol and hydrocarbons. Metal chalcogenides1­9 are promisingCdSe-MoS2: A Quantum Size-Confined Photocatalyst for Hydrogen Evolution from Water under Visible driven pathway to hydrogen. Hydrogen is not only an environmentally benign fuel for the generation

Osterloh, Frank

255

O final de ano se aproxima e as tempesta-des severas e as "chuvas contnuas" voltam  

E-Print Network [OSTI]

, enquanto se investiu na melhoria de infra-estrutura de energia do prédio do CPTEC. Como fruto deste esforço IDD- análise de grande variedade de dados Brasil, que tem no CPTEC o seu centro mais meteorológicos

Domingues, Margarete Oliveira

256

Latest Ordovicianearliest Silurian acritarchs and chitinozoans from1 subsurface samples in Jebel Asba, Kufra Basin, SE Libya2  

E-Print Network [OSTI]

Asba, Kufra Basin, SE Libya2 3 Bindra Thusu1 , Syed Rasul1 , Florentin Paris2 , Guido Meinhold3 & Gas B.V., Dat Al Imad Complex Tower 5 Floor 13, P.O. Box 91651, Tripoli,15 Libya16 17 * Corresponding of the Kufra Basin,36 southeastern Libya, yielded well-diversified palynomorph assemblages with transparent and

Paris-Sud XI, Université de

257

Toward microscale Cu,,In,Ga...Se2 solar cells for efficient conversion and optimized material usage: Theoretical evaluation  

E-Print Network [OSTI]

solar cells are gaining a growing market share in the photovoltaic field. CIGS thin film solar cells. In this paper, the behavior of microscale thin film solar cells under concen- tration will be studied. We focusToward microscale Cu,,In,Ga...Se2 solar cells for efficient conversion and optimized material usage

Boyer, Edmond

258

Simulation of Polycrystalline Cu(In,Ga)Se2 Solar Cells in Two Dimensions Markus Gloeckler, Wyatt K. Metzger1  

E-Print Network [OSTI]

that a plausible reason behind highly efficient thin-film CIGS solar cells ( > 17%) is an inherent valenceSimulation of Polycrystalline Cu(In,Ga)Se2 Solar Cells in Two Dimensions Markus Gloeckler, Wyatt K) solar cells and its effects on solar-cell performance. The simulations predict that (1) for device

Sites, James R.

259

Photoconductive CdSe Nanowire Arrays, Serpentines, and Loops Formed by Electrodeposition on Self-Organized Carbon Nanotubes  

E-Print Network [OSTI]

Photoconductive CdSe Nanowire Arrays, Serpentines, and Loops Formed by Electrodeposition on Self-Organized Carbon Nanotubes X. Wendy Gu,,§ Nitzan Shadmi, Tohar S. Yarden,, Hagai Cohen, and Ernesto Joselevich with controlled geometries by using self-organized single-walled carbon nanotubes as a template for the selective

Joselevich, Ernesto

260

Por qu se invierte en plantaciones de Jatropha? Respuestas desde Costa Rica Abigail Fallot a,b,*  

E-Print Network [OSTI]

1 Título ¿Por qué se invierte en plantaciones de Jatropha? Respuestas desde Costa Rica Autores de plantaciones de Jatropha curcas (Tempate) para biodiesel, analizamos el caso de Costa Rica donde tiempo por falta de producción significativa. Buscando explicación al interés renovado por la Jatropha

Paris-Sud XI, Université de

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261

Wind profile above the surface boundary layer S.-E. Gryning (1), E. Batchvarova (2) and B. Brmmer (3)  

E-Print Network [OSTI]

Wind profile above the surface boundary layer S.-E. Gryning (1), E. Batchvarova (2) and B. Brümmer in predictions of the wind profile in the lowest hundreds me- ters of the atmosphere, being connected to the general increase in height of structures such as bridges, high houses and wind turbines. The hub height

262

Emplacement in an extensional setting of the Mont LozreBorne granitic complex (SE France) inferred from  

E-Print Network [OSTI]

Emplacement in an extensional setting of the Mont Lozère­Borne granitic complex (SE France of the Late Hercynian Mont Lozère­Borne granitic complex (French Massif Central), which consists of several carried out to characterize the internal fabrics of the granitic plutons. Throughout the Pont

Paris-Sud XI, Université de

263

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

264

MaterialsScienceandEngineeringDepartmentColloquium 4:00 P.M. Monday, SePteMber 22, 2014  

E-Print Network [OSTI]

Creativity. Archer received his Ph.D. in chemical engineering from Stanford University in 1993MaterialsScienceandEngineeringDepartmentColloquium 4:00 P.M. Monday, SePteMber 22, 2014 rooM 100, MaterialS Science and engineering building 1304 W green Street, urbana Department of Materials Science

Gilbert, Matthew

265

DETERMINATION OF BACK CONTACT BARRIER HEIGHT IN Cu(In,Ga)(Se,S)2 AND CdTe SOLAR CELLS  

E-Print Network [OSTI]

DETERMINATION OF BACK CONTACT BARRIER HEIGHT IN Cu(In,Ga)(Se,S)2 AND CdTe SOLAR CELLS Galymzhan T-contact metallization. The input data is the current- voltage (J-V) curves for the solar cell measured over a range point technique and apply it to specific solar-cell examples. The range of Jt that can be practically

Sites, James R.

266

Investigations on the StranskiKrastanow growth of CdSe quantum dots D. Schikora,a)  

E-Print Network [OSTI]

, respectively. Recording clear resolved RHEED oscillations in combination with phase-locked epi- taxy, the Cd type B islands are correlated with a phase transition via a Stranski­Krastanow growth process of about 15 mW as excitation source. The CdSe QD samples grown in this study show typical structural

Nabben, Reinhard

267

Vegetation and climate dynamics during the early Middle Miocene from Lake Sinj (Dinaride Lake System, SE Croatia)  

E-Print Network [OSTI]

System, SE Croatia) Gonzalo Jiménez-Moreno a, , Oleg Mandic b , Mathias Harzhauser b , Davor Paveli c of Zagreb, Pierottijeva 6, HR-10000 Zagreb, Croatia A B S T R A C TA R T I C L E I N F O Article history 2008 Keywords: pollen vegetation climate change Miocene Croatia Pollen data from sediments from

Jiménez-Moreno, Gonzalo

268

Presentacin del ISO El Instituto de Sntesis Orgnica (ISO), se constituye como un Instituto Universitario de Investigacin en  

E-Print Network [OSTI]

Presentación del ISO El Instituto de Síntesis Orgánica (ISO), se constituye como un Instituto. El ISO está implicado también en actividades docentes referidas a enseñanzas en un Programa de de sus competencias. El ISO fomentará la relación con otras entidades públicas y privadas

Escolano, Francisco

269

Peer-reviewed Publications in 2008 1. Bellinger BJ, Underwood GJC, Ziegler SE and Gretz MR (2008) The  

E-Print Network [OSTI]

Peer-reviewed Publications in 2008 1. Bellinger BJ, Underwood GJC, Ziegler SE and Gretz MR (2008-inflammatory activities of a new class of 5-glycylamino-2-substituted-phenyl-1,3-dioxacycloalkanes. Bioorganic & Medicinal, Korea; Sept.28-Oct. 1, 2008; pg. 46-51. 5. Busov VB, Brunner AM and Strauss SH (2008) Genes for control

270

in: D. E. Dobbs, M. Fontana, S.-E. Kabbaj (eds.), Advances in Commutative Ring Theory (Fes III Conf. 1997)  

E-Print Network [OSTI]

, which shows r to be invertible.) This prompts the question how many functions on R are representablein: D. E. Dobbs, M. Fontana, S.-E. Kabbaj (eds.), Advances in Commutative Ring Theory (Fes III Conf. 1997) Lecture Notes in Pure and Appl. Mathematics 205, Dekker 1999, pp 323­336. POLYNOMIAL FUNCTIONS

Frisch, Sophie

271

in: D. E. Dobbs, M. Fontana, S.-E. Kabbaj (eds.), Advances in Commutative Ring Theory (Fes III Conf. 1997)  

E-Print Network [OSTI]

+ . .+.anrn-1 )r, which shows r to be invertible.) This prompts the question how many functions on R in: D. E. Dobbs, M. Fontana, S.-E. Kabbaj (eds.), Advances in Commutative Ring Theory (Fes III-336. POLYNOMIAL FUNCTIONS ON FI NITE COMMUTATIVE RI NGS

Frisch, Sophie

272

Ab initio molecular-dynamics study of the structural, vibrational, and electronic properties of glassy GeSe 2  

E-Print Network [OSTI]

Ab initio molecular-dynamics study of the structural, vibrational, and electronic properties We present results of an ab initio molecular-dynamics study of glassy GeSe2 using a 216 atom model static structure factors, and ring structures. The total static structure factor and first sharp

Drabold, David

273

OPTIMIZATION STUDY OF COPPER PRECURSORS FOR HIGH QUALITY CuInSe2 NANOPARTICLES BY WET CHEMICAL ROUTE  

E-Print Network [OSTI]

of the most promising material system for thin film photovoltaics owing to their unique structural, respectively. The synthesis process was optimized to grow 20 to 150 nm sized nanostructures of CuInSe2 inherent merits in reducing the cost per watt of the fabricated PV modules. Various size, shape

Anderson, Timothy J.

274

Transition threshold in Ge{sub x}Sb{sub 10}Se{sub 90?x} glasses  

SciTech Connect (OSTI)

Ge{sub x}Sb{sub 10}Se{sub 90?x} glasses with Ge content from 7.5 to 32.5?at.?% have been prepared by melt-quench technique, and the physical parameters including glass transition temperature (T{sub g}), density (?), compactness (C), shear elastic moduli (C{sub s}), compression elastic moduli (C{sub c}), refractive index (n), and optical bandgap (E{sub g}) have been investigated. While all these physical parameters show threshold behavior in the glass with a chemically stoichiometric composition. Raman spectra analysis also indicates that, with increasing Ge content, Se-chains or rings gradually disappear until all Se-atoms are consumed in the glass with a chemically stoichiometric composition. With further increasing Ge content, homopolar Ge-Ge and Sb-Sb bonds are formed and the chemical order in the glasses is violated. The threshold behavior of the physical properties in the Ge{sub x}Sb{sub 10}Se{sub 90?x} glasses can be traced to demixing of networks above the chemically stoichiometric composition.

Wei, Wen-Hou [Department of Applied Physics, Chongqing University, Chongqing 401331 (China); Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia); Fang, Liang, E-mail: lfang@cqu.edu.cn [Department of Applied Physics, Chongqing University, Chongqing 401331 (China); Shen, Xiang [Laboratory of Infrared Material and Devices, Advanced Technology Research Institute, Ningbo University, Ningbo 315211 (China); Wang, Rong-Ping [Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia)

2014-03-21T23:59:59.000Z

275

Process Creation in JavaProcess Creation in Java Note: Java really doesn't implement processes per se, but  

E-Print Network [OSTI]

Process Creation in JavaProcess Creation in Java · Note: Java really doesn't implement processes per se, but provides a clean interface to spawn processes to run system programs outside of the JVM · "Process" class in Java ­ Runtime.getRuntime.exec("") method will return a process object (interface

Klassner, Frank

276

High-pressure single-crystal X-ray diffraction of Tl{sub 2}SeO{sub 4}  

SciTech Connect (OSTI)

The effect of pressure on the crystal structure of thallium selenate (Tl{sub 2}SeO{sub 4}) (Pmcn, Z=4), containing the Tl{sup +} cations with electron lone pairs, has been studied with single-crystal X-ray diffraction in a diamond anvil cell up to 3.64 GPa at room temperature. No phase transition has been observed. The compressibility data are fitted by a Murnaghan equation of state with the zero-pressure bulk modulus B{sub 0}=29(1) GPa and the unit-cell volume at ambient pressure V{sub 0}=529.6(8) A{sup 3} (B'=4.00). Tl{sub 2}SeO{sub 4} is the least compressible in the c direction, while the pressure-induced changes of the a and b lattice parameters are quite similar. These observations can be explained by different pressure effects on the nine- and 11-fold coordination polyhedra around the two non-equivalent Tl atoms. The SeO{sub 4}{sup 2-} tetrahedra are not rigid units and become more distorted. Their contribution to the compressibility is small. The effect of pressure on the isotypical oxide materials A{sub 2}TO{sub 4} with the {beta}-K{sub 2}SO{sub 4} structure is discussed. It appears that the presence of electron lone pairs on the Tl{sup +} cation does not seem to influence the compressibility of Tl{sub 2}SeO{sub 4}. - Graphical abstract: Pressure dependence of normalized lattice parameters and unit-cell volumes in Tl{sub 2}SeO{sub 4} (Pmcn, Z=4). The solid line is the Murnaghan equation of state.

Grzechnik, Andrzej [Departamento de Fisica de la Materia Condensada, Universidad del Pais Vasco, E-48080 Bilbao (Spain)], E-mail: andrzej.grzechnik@ehu.es; Breczewski, Tomasz; Friese, Karen [Departamento de Fisica de la Materia Condensada, Universidad del Pais Vasco, E-48080 Bilbao (Spain)

2008-11-15T23:59:59.000Z

277

Comparative Study of the Defect Point Physics and Luminescence of the Kesterites Cu2ZnSnS4 and Cu2ZnSnSe4 and Chalcopyrite Cu(In,Ga)Se2: Preprint  

SciTech Connect (OSTI)

In this contribution, we present a comparative study of the luminescence of the kesterites Cu2ZnSnS4 (CZTS) and Cu2ZnSnSe4 (CZTSe) and their related chalcopyrite Cu(In,Ga)Se2 (CIGSe). Luminescence spectroscopy suggests that the electronic properties of Zn-rich, Cu-poor kesterites (both CZTS and CZTSe) and Cu-poor CIGSe are dictated by fluctuations of the electrostatic and chemical potentials. The large redshift in the luminescence of grain boundaries in CIGSe, associated with the formation of a neutral barrier is clearly observed in CZTSe, and, to some extent, in CZTS. Kesterites can therefore replicate the fundamental electronic properties of CIGSe.

Romero, M. J.; Repins, I.; Teeter, G.; Contreras, M.; Al-Jassim, M.; Noufi, R.

2012-08-01T23:59:59.000Z

278

Three-dimensional topological insulators Bi{sub 2}Te{sub 3}, Bi{sub 2}Se{sub 3}, and Bi{sub 2}Te{sub 2}Se - a microwave spectroscopy study  

SciTech Connect (OSTI)

We present results of investigations of three-dimensional topological insulators from a family of bismuth compounds performed in electron spin resonance spectrometer. Next to the standard spin resonance spectra in Bi{sub 2}Se{sub 3} originating from bulk conduction electrons (g{sub Verbar;} = 27.5 ± 0.1 and g{sub ?} = 19.5 ± 0.1), we observed also cyclotron resonance due to topological surface states in Bi{sub 2}Te{sub 3} and non-resonant signal related to weak anti-localization in Bi{sub 2}Te{sub 2}Se. The analysis of the cyclotron resonance signal yields low Fermi velocity equal to 3250 m/s in Bi{sub 2}Te{sub 3}. The phase coherence length determined from weak anti-localization signal equals to 550 nm at low temperatures in Bi{sub 2}Te{sub 2}Se. Relation of the signals to bulk, topological surface or two-dimensional quantum well states is discussed and where possible indicated.

Wolos, A. [Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland and Faculty of Physics, University of Warsaw, ul Hoza 69, 00-681 Warsaw (Poland); Drabinska, A.; Szyszko, S.; Kaminska, M. [Faculty of Physics, University of Warsaw, ul Hoza 69, 00-681 Warsaw (Poland); Strzelecka, S. G.; Hruban, A.; Materna, A.; Piersa, M. [Institute of Electronic Materials Technology, ul. Wolczynska 133, 01-919 Warsaw (Poland)

2013-12-04T23:59:59.000Z

279

Synthesis, Crystal Structure, and Magnetism of ?-Fe1.00(2)Se1.00(3) Single Crystals  

SciTech Connect (OSTI)

Understanding iron-based superconductors requires high-quality impurity-free single crystals. So far they have been elusive for {beta}-FeSe and extraction of intrinsic materials properties has been compromised by several magnetic-impurity phases. Here, we report synchrotron-clean {beta}-FeSe superconducting single crystals grown via LiCl/CsCl flux method. Phase purity yields evidence for a defect-induced weak ferromagnetism that coexists with superconductivity below T{sub c}. In contrast to Fe{sub 1+y}Te-based superconductors, our results reveal that the interstitial Fe(2) site is not occupied and that all contribution to density of states at the Fermi level must come from in-plane Fe(1).

Petrovic, C.; Billinge, S.

2011-06-20T23:59:59.000Z

280

Study of optical parameters of the Se-As chalcogenide semiconductor system containing EuF{sub 3} impurities  

SciTech Connect (OSTI)

Optical properties of chalcogenide vitreous semiconductors of composition Se{sub 95}As{sub 5} containing different amounts of rare-earth metal fluorides (EuF{sub 3}) are studied, and, on this basis, the fundamental parameters, such as the refractive index and extinction coefficient, are determined. The dependences of these parameters on the content of EuF{sub 3} molecules are nonmonotonic: the low content (below 0.25 at %) aids in decreasing the parameters, whereas the high content tends to increase them. From the analysis of the results with consideration for the structural features of chalcogenide vitreous semiconductors of the Se{sub 95}As{sub 5} system (the presence of ordered high-coordinated microregions separated from each other by regions with a lower atomic density), it is concluded that the optical properties of the chalcogenide vitreous semiconductor system under study can be described in the context of Penn's model.

Isayev, A. I.; Mekhtiyeva, S. I.; Garibova, S. N., E-mail: sgaribova@rambler.ru; Alekperov, R. I.; Zeynalov, V. Z. [Azerbaijan National Academy of Sciences, Abdullaev Institute of Physics (Azerbaijan)

2011-08-15T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" 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

Comment prsenter une demande afin d'obtenir un nouveau visa de rsident temporaire ? (demandeurs se trouvant au Canada)  

E-Print Network [OSTI]

se trouvant au Canada) Si vous vous trouvez actuellement au Canada en vertu d'un statut valide de présenter votre demande depuis le Canada si vous répondez aux critères suivants : Vous êtes un résident temporaire (étudiant ou travailleur étranger temporaire seulement) admis légalement au Canada et vous

Parrott, Lael

282

Depositional environments, diagenesis, and porosity development of Mississippian Chappel carbonates at Thrash and Quanah SE Fields, Hardeman County, Texas  

E-Print Network [OSTI]

) . This shale, rich in organic matter, thins to the west and is considered to be the potential source rock for the Mississippian reservoirs (Montgomery, 1984) . Later active tectonics resulted in input of clastics to the edges of the basin from basement... Formation at Thrash and Quanah SE Fields is characterized by deep-water limestones with local skeletal buildups on a low-energy, distally-steepened ramp. Three depositional environments have been recognized from these lv rocks: 1) the deep ? water...

He, Shiliang T.

1989-01-01T23:59:59.000Z

283

Why chooSe SketchUp? A coUple overAll tipS  

E-Print Network [OSTI]

Page 1 SketchUp Google Why chooSe SketchUp? A coUple overAll tipS SoftWAre lAyoUt Google SketchUp programs and is free to download to your home computer. Just visit http://sketchup.google.com to download, working on.· If you make a mistake within Sketchup, such as deleting a shape, go to Edit > Undo to step

Zaferatos, Nicholas C.

284

Efficient band alignment for ZnxCd1xSe QD-sensitized TiO2 solar cells  

E-Print Network [OSTI]

the signicant breakthrough in dye-sensitized solar cells (DSSCs) was rst reported by O'Regan and GrEfficient band alignment for ZnxCd1�xSe QD-sensitized TiO2 solar cells Lin Yang,ab Ru Zhou,a Jolin photoelectrodes for solar cells. In the fabricated QDs sensitized solar cells, QDs with the composition of x ¼ 0

Cao, Guozhong

285

A Basis Set of Re6Se8 Cluster Building Blocks and Demonstration of Their Linking Capability: Directed Synthesis  

E-Print Network [OSTI]

of 4 with AgBF4 in dichloromethane/acetonitrile gave cis-[Re6Se8(PEt3)4(MeCN)2]2+ (7); a similar at 180 °C for 24 h under dynamic vacuum, the compounds [8]X2 (X ) BF4 -, SbF6 -) lose acetonitrile, which can give only one logical product upon deligation of acetonitrile. The synthesis concept

286

Electric tuning of the surface and quantum well states in Bi2Se3 films: a first-principles study  

SciTech Connect (OSTI)

Based on first-principles calculations in the framework of van der Waals density functional theory, we find that giant, Rashba-like spin splittings can be induced in both the surface states and quantum well states of thin Bi2Se3 films by application of an external electric field. The charge is redistributed so that the Dirac cones of the upper and lower surfaces become nondegenerate and completely gapless. Interestingly, a momentum-dependent spin texture is developed on the two surfaces of the films. Some of the quantum well states, which reside in the middle of the Bi2Se3 film under zero field, are driven to the surface by the electric field. The Rashba splitting energy has a highly non-linear dependence on the momentum and the electric field due to the large contribution of the high-order Rashba terms, which suggests complex spin dynamics in the thin films of Bi2Se3 under an electric field.

Yang, Hong [Xiangtan University, Xiangtan Hunan, China; Peng, Xiangyang [Xiangtan University, Xiangtan Hunan, China; Liu, Wenliang [Xiangtan University, Xiangtan Hunan, China; Wei, Xiaolin [Xiangtan University, Xiangtan Hunan, China; Hao, Guolin [Xiangtan University, Xiangtan Hunan, China; He, Chaoyu [Xiangtan University, Xiangtan Hunan, China; Li, Jin [Xiangtan University, Xiangtan Hunan, China; Stocks, George Malcolm [ORNL; Zhong, Jianxin [Xiangtan University, Xiangtan Hunan, China

2014-01-01T23:59:59.000Z

287

Study of 2b-decay of Mo-100 and Se-82 using the NEMO3 detector  

E-Print Network [OSTI]

After analysis of 5797 h of data from the detector NEMO3, new limits on neutrinoless double beta decay of Mo-100 (T_{1/2} > 3.1 10^{23} y, 90% CL) and Se-82 (T_{1/2} > 1.4 10^{23} y, 90% CL) have been obtained. The corresponding limits on the effective majorana neutrino mass are: m 1.4 10^{22} y (90% CL) for Mo-100 and T_{1/2}> 1.2 10^{22} y (90%CL) for Se-82. Corresponding bounds on the Majoron-neutrino coupling constant are g < (0.5-0.9) 10^{-4} and < (0.7-1.6) 10^{-4}. Two-neutrino 2b-decay half-lives have been measured with a high accuracy, T_{1/2} Mo-100 = [7.68 +- 0.02(stat) +- 0.54(syst) ] 10^{18} y and T_{1/2} Se-82 = [10.3 +- 0.3(stat) +- 0.7(syst) ] 10^{19} y.

the NEMO Collaboration; R. Arnold

2004-10-07T23:59:59.000Z

288

Theoretical mean field and experimental occupation probabilities in the double beta decay system 76Ge to 76Se  

E-Print Network [OSTI]

Usual Woods-Saxon single particle levels with BCS pairing are not able to reproduce the experimental occupation probabilities of the proton and neutron levels 1p_{3/2}, 1p_{1/2}, 0f_{5/2}, 0g_{9/2} in the double-beta decay system 76Ge to 76Se. Shifting down the 0g_{9/2} level by hand can explain the data but it is not satisfactory. Here it is shown that a selfconsistent Hartree-Fock+BCS approach with experimental deformations for 76Ge and 76Se may decisively improve the agreement with the recent data on occupation probabilities by Schiffer et al. and Kay et al. Best agreement with available data on 76Ge and 76Se, as well as on neighbor isotopes, is obtained when the spin-orbit strength for neutrons is allowed to be larger than that for protons. The two-neutrino double-beta decay matrix element is also shown to agree with data.

Moreno, O; Sarriguren, P; Faessler, Amand

2010-01-01T23:59:59.000Z

289

87Rb and 85Rb NQR study of phase transitions in RbH3(SeO3)2 J. Seliger, V. 017Dagar, R. Blinc  

E-Print Network [OSTI]

521 87Rb and 85Rb NQR study of phase transitions in RbH3(SeO3)2 J. Seliger, V. 017Dagar, R. Blinc J résonance quadrupolaire de 85Rb et 87Rb dans le composé RbH3(SeO3)2 par une technique de double résonance SeO3. Nous avons confirmé l'existence d'une phase incommensurable intermédiaire entre Tc et Tc + 4 K

Paris-Sud XI, Université de

290

Performance and Loss Analyses of High-Efficiency CBD-ZnS/Cu(In1-xGax)Se2 Thin-Film Solar Cells  

E-Print Network [OSTI]

1 Performance and Loss Analyses of High-Efficiency CBD-ZnS/Cu(In1-xGax)Se2 Thin-Film Solar Cells, Setagaya-ku, Tokyo 157-8572, Japan (Received ) KEYWORDS: ZnS buffer, Cu(In,Ga)Se2, thin-film solar cells alternative to CdS in polycrystalline thin-film Cu(In1-xGax)Se2 (CIGS) solar cells. Cells with efficiency

Sites, James R.

291

DEVELOPMENT OF A NOVEL PRECURSOR FOR THE PREPARATION BY SELENIZATION OF HIGH EFFICIENCY CuInGaSe2/CdS THIN FILM SOLAR CELLS  

E-Print Network [OSTI]

/CdS THIN FILM SOLAR CELLS N. Romeo1 , A. Bosio1 , V. Canevari2 , R. Tedeschi1 , S. Sivelli1 , A. Solar cells prepared by depositing in sequence on top of the CuInGaSe2 film 60 nm of CdS, 100 nm of pure(InGa)Se2, Thin Films, Selenization 1 INTRODUCTION CuInGaSe2 based solar cells exhibit the highest

Romeo, Alessandro

292

TOPOLOGIA 1 e Topologia per Fisica 22/6/2009 1. Esercizio. Se X `e spazio topologico e Y `e un insieme, una funzione f : X Y  

E-Print Network [OSTI]

TOPOLOGIA 1 e Topologia per Fisica ­ 22/6/2009 1. Esercizio. Se X `e spazio topologico e Y `e un insieme, una funzione f : X Y `e detta localmente costante se per ogni p X esiste un intorno U di p in X tale che la restrizione f|U `e costante. Dimostrare che se X `e connesso, allora ogni f : X Y che sia

Marconi, Umberto

293

Synthesis, single-crystal structure, and optical absorption of Rb{sub 2}Th{sub 7}Se{sub 15}  

SciTech Connect (OSTI)

The compound Rb{sub 2}Th{sub 7}Se{sub 15} has been synthesized by the solid-state reaction at 1273 K of Th, Rb{sub 2}Se{sub 3}, Se, and Ge, and its structure has been determined by single-crystal X-ray diffraction methods. Red crystals of Rb{sub 2}Th{sub 7}Se{sub 15} crystallize at 100(2) K with four formula units in a new structure type in the monoclinic space group C{sub 2h}{sup 5}?P2{sub 1}/c. The structure is three-dimensional and comprises Rb and Th atoms coordinated by Se atoms to form nine-, eight-, and seven-coordinate polyhedra. Infinite channels that contain Rb atoms are present. Crystals of Rb{sub 2}Th{sub 7}Se{sub 15} are red in color; an indirect band gap of 1.83 eV was derived from single-crystal optical measurements. - Graphical abstract: Structure of Rb{sub 2}Th{sub 7}Se{sub 15} viewed down the b-axis. Display Omitted - Highlights: • The new compound Rb{sub 2}Th{sub 7}Se{sub 15} was synthesized at 1273 K from the elements in the presence of Ge. • The structures of the two known Rb/Th/Se compounds, RbTh{sub 2}Se{sub 6} and Rb{sub 2}Th{sub 7}Se{sub 15}, differ markedly. • Optical measurements establish the band gap of Rb{sub 2}Th{sub 7}Se{sub 15} to be indirect with a value of 1.83 eV.

Koscielski, Lukasz A.; Pozzi, Eric A.; Van Duyne, Richard P.; Ibers, James A., E-mail: ibers@chem.northwestern.edu

2013-09-15T23:59:59.000Z

294

Conductance modulation in topological insulator Bi{sub 2}Se{sub 3} thin films with ionic liquid gating  

SciTech Connect (OSTI)

A Bi{sub 2}Se{sub 3} topological insulator field effect transistor is investigated by using ionic liquid as an electric double layer gating material, leading to a conductance modulation of 365% at room temperature. We discuss the role of charged impurities on the transport properties. The conductance modulation with gate bias is due to a change in the carrier concentration, whereas the temperature dependent conductance change is originated from a change in mobility. Large conductance modulation at room temperature along with the transparent optical properties makes topological insulators as an interesting (opto)electronic material.

Son, Jaesung; Banerjee, Karan; Yang, Hyunsoo, E-mail: eleyang@nus.edu.sg [Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576 (Singapore)] [Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576 (Singapore); Brahlek, Matthew; Koirala, Nikesh; Oh, Seongshik [Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Road, Piscataway, New Jersey 08854 (United States)] [Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Road, Piscataway, New Jersey 08854 (United States); Lee, Seoung-Ki [School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440-746 (Korea, Republic of) [School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440-746 (Korea, Republic of); School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749 (Korea, Republic of); Ahn, Jong-Hyun [School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749 (Korea, Republic of)] [School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749 (Korea, Republic of)

2013-11-18T23:59:59.000Z

295

Elastic Scattering Of {sup 6,7}Li+{sup 80}Se At Near And Above Barrier Energies  

SciTech Connect (OSTI)

In this work we propose to study the elastic scattering of the weakly bound projectiles {sup 6,7}Li on an intermediate mass target {sup 80}Se. From the experimental results presented here, precise angular distributions at energies below, around and above the nominal Coulomb barriers of the systems were obtained. The final goal of our work is to determine the characteristic parameters of the optical potential and use them to address the question of whether the usual threshold anomaly or the breakup threshold anomaly are present or not in these systems.

Fimiani, L.; Marti, G. V.; Capurro, O. A.; Barbara, E. de; Testoni, J. E.; Zalazar, L. [Laboratorio TANDAR, Comision Nacional de Energia Atomica, Av. Gral. Paz 1499 B1650KNA, San Martin (Argentina); Arazi, A.; Cardona, M. A.; Carnelli, P.; Figueira, J. M.; Hojman, D.; Martinez Heimann, D.; Negri, A. E.; Pacheco, A. J. [Laboratorio TANDAR, Comision Nacional de Energia Atomica, Av. Gral. Paz 1499 B1650KNA, San Martin (Argentina); CONICET, Av. Rivadavia 1917, C1033AAJ Buenos Aires (Argentina); Fernandez Niello, J. O. [Laboratorio TANDAR, Comision Nacional de Energia Atomica, Av. Gral. Paz 1499 B1650KNA, San Martin (Argentina); CONICET, Av. Rivadavia 1917, C1033AAJ Buenos Aires (Argentina); Universidad Nacional de General San Martin, Ayacucho 2197, B1650BWA San Martin (Argentina)

2010-08-04T23:59:59.000Z

296

Intracavity laser spectroscopy with a semiconductor disk laser-pumped cw Cr{sup 2+} : ZnSe laser  

SciTech Connect (OSTI)

Absorption spectra of the air have been measured near 2.31 ?m using intracavity laser spectroscopy with a semiconductor disk laser-pumped cw Cr{sup 2+} : ZnSe laser. It is shown that, at lasing times of at least 3 ms, the sensitivity of the laser to intracavity absorption increases. This allows one to reach an effective path length of 900 km and enables detection of weak lines with absorption coefficients down to 1 × 10{sup -9} cm{sup -1}. (laser spectroscopy)

Kozlovsky, V I; Korostelin, Yu V; Podmar'kov, Yu P; Skasyrsky, Ya K; Frolov, M P [P N Lebedev Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation); Okhotnikov, O G [Optoelectronics Research Center, Tampere University of Technology, Tampere (Finland); Akimov, V A [Moscow Institute of Physics and Technology (State University), Dolgoprudnyi, Moscow Region (Russian Federation)

2013-09-30T23:59:59.000Z

297

Absorber processing issues in high-efficiency, thin-film Cu(In,Ga)Se{sub 2}-based solar cells  

SciTech Connect (OSTI)

Three approaches to thin-film Cu(In,Ga)Se{sub 2} absorber fabrication are considered. They are generically described in terms of the sequential or concurrent nature of source material delivery, selenium delivery, and compound formation. A two-stage evaporation process successfully produced the absorber component of a world-record, 17.1{percent} efficient solar cell. Alternative approaches that reduce the requirements for high substrate temperatures are considered. The relationship between absorber process parameters, band gap profile, and device performance are examined. Engineering the [Ga]/([Ga]+[In]) profile in the absorber has led to the reported advances. {copyright} {ital 1996 American Institute of Physics.}

Tuttle, J.R.; Gabor, A.M.; Contreras, M.A.; Tennant, A.L.; Ramanathan, K.R.; Franz, A.; Matson, R.; Noufi, R. [National Renewable Energy Laboratory, Golden, Colorado 80401 (United States)

1996-01-01T23:59:59.000Z

298

Thermoelectric properties of M{sub 2}Mo{sub 6}Se{sub 6} (M =Tl,In)  

SciTech Connect (OSTI)

The authors have measured the thermal conductivity of Tl{sub 2}Mo{sub 6}Se{sub 6}, a quasi-one dimensional conductor which belongs to the family of M{sub 2}Mo{sub 6}X{sub 6} linear chain compounds. Using these results and the measurements of the Seebeck coefficient and the electrical conductivity the authors estimate the dimensionless figure of merit to be of the order of 0.08. This result suggest that this compound and other related compounds are good potential TE.

Verebelyi, D.T.; Payne, J.E.; Tessema, G.X.; Mengistu, E.

1997-07-01T23:59:59.000Z

299

Properties of electrospun CdS and CdSe filled poly(methyl methacrylate) (PMMA) nanofibres  

SciTech Connect (OSTI)

Graphical abstract: SEM images of CdS/PMMA showing coiling as loading of CdS nanoparticles is increased. Thermal stability is increased with increase in %loading of both CdS and CdSe nanoparticles. Research highlights: {yields} TOPO-capped CdS and HDA-capped CdSe nanoparticles were synthesized and fully characterized. {yields} The nanoparticles were mixed with the polymer, PMMA using electrospinning technique using 2, 5 and 10% weight loadings. {yields} The mixture was spun to produce fibres with optical and thermal properties showing significant change and also the increase in loading causing bending or spiraling. {yields} Both TEM images for nanoparticles and SEM for fibres shows the morphology and sizes of the particles. -- Abstract: Electrospinning technique was used to fabricate poly(methyl methacrylate) (PMMA) fibres incorporating CdS and CdSe quantum dots (nanoparticles). Different nanoparticle loadings (2, 5 and 10 wt% with respect to PMMA) were used and the effect of the quantum dots on the properties of the fibres was studied. The optical properties of the hybrid composite fibres were investigated by photoluminescence and UV-vis spectrophotometry. Scanning electron microscopy (SEM), X-ray diffraction and FTIR spectrophotometry were also used to investigate the morphology and structure of the fibres. The optical studies showed that the size-tunable optical properties can be achieved in the polymer fibres by addition of quantum dots. SEM images showed that the morphologies of the fibres were dependent on the added amounts of quantum dots. A spiral type of morphology was observed with an increase in the concentration of CdS and CdSe nanoparticles. Less beaded structures and bigger diameter fibres were obtained at higher quantum dot concentrations. X-ray diffractometry detected the amorphous peaks of the polymer and even after the quantum dots were added and the FTIR analysis shows that there was no considerable interaction between the quantum dots and the polymer fibres at low concentration of quantum dots however at higher concentrations some interactions were observed which shows that QDs were present on the surfaces of the fibres.

Mthethwa, T.P. [University of Johannesburg, Department of Chemical Technology, P.O. Box 17011, Doornfontein 2028 (South Africa)] [University of Johannesburg, Department of Chemical Technology, P.O. Box 17011, Doornfontein 2028 (South Africa); Moloto, M.J., E-mail: mmoloto@uj.ac.za [University of Johannesburg, Department of Chemical Technology, P.O. Box 17011, Doornfontein 2028 (South Africa); De Vries, A.; Matabola, K.P. [CSIR Materials Science and Manufacturing, 4 Gomery avenue, Summerstrand, Port Elizabeth 6000 (South Africa)] [CSIR Materials Science and Manufacturing, 4 Gomery avenue, Summerstrand, Port Elizabeth 6000 (South Africa)

2011-04-15T23:59:59.000Z

300

Electrically driven single photon emission from a CdSe/ZnSSe single quantum dot at 200?K  

SciTech Connect (OSTI)

High temperature operation of an electrically driven single photon emitter based on a single epitaxial quantum dot is reported. CdSe/ZnSSe/MgS quantum dots are embedded into a p-i-n diode architecture providing almost background free excitonic and biexcitonic electroluminescence from individual quantum dots through apertures in the top contacts. Clear antibunching with g{sup 2}(??=?0)?=?0.28?±?0.20 can be tracked up to T?=?200?K, representing the highest temperature for electrically triggered single photon emission from a single quantum dot device.

Quitsch, Wolf; Kümmell, Tilmar; Bacher, Gerd [Werkstoffe der Elektrotechnik and CENIDE, Universität Duisburg-Essen, Bismarckstraße 81, 47057 Duisburg (Germany); Gust, Arne; Kruse, Carsten; Hommel, Detlef [Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, 28334 Bremen (Germany)

2014-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" 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

friction se boratoire : Lab  

E-Print Network [OSTI]

, dans lequ apport à la sur gout prononcé DEA) qui vou e : OUI NON Plots micrométriq ncepts Fondam sique

Paris-Sud 11, Université de

302

PHaSe-EFRC  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary)morphinanInformation InInformation InExplosion Monitoring:Home|Physics Research High-Energy- OakOne-stop

303

Midea: Order (2010-SE-0110, 2012-SE-1402, 2012-SE-1404, 2013-SE-1401) |  

Energy Savers [EERE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector General Office0-72.pdfGeorgeDoesn't32 MasterAcquisiti ----Energy

304

Predicted roles of defects on band offsets and energetics at CIGS (Cu(In,Ga)Se2/CdS) solar cell interfaces and implications for improving performance  

E-Print Network [OSTI]

, and in- deed the global operating capacity for solar photovoltaics is increasing steadily.1 CurrentlyPredicted roles of defects on band offsets and energetics at CIGS (Cu(In,Ga)Se2/CdS) solar cell ZnO sputtering on the performance of Cu(In,Ga)Se2 thin film solar cells Appl. Phys. Lett. 105, 083906

Goddard III, William A.

305

Micro-Raman spectroscopy of mechanically exfoliated few-quintuple layers of Bi2Te3, Bi2Se3, and Sb2Te3 materials  

E-Print Network [OSTI]

Micro-Raman spectroscopy of mechanically exfoliated few-quintuple layers of Bi2Te3, Bi2Se3, and Sb2-like" exfoliated few-quintuple layers of Bi2Te3, Bi2Se3, and Sb2Te3. It is found that crystal symmetry breaking

306

Investigation of Temperature Dependent Optical Modes in GexAs35-xSe65 Thin Films: Structure Specific Raman, FIR and Optical Absorption Spectroscopy  

E-Print Network [OSTI]

In this article, we present a comprehensive study of temperature and composition dependent Raman spectroscopy of GexAs35-xSe65 thin films to understand different structural units responsible for optical properties. Strikingly, our experimental results uncover the ratio of GeSe4/2 tetrahedral and AsSe3/2 pyramidal units in GexAs35-xSe65 thin films and their linear scaling relationship with temperature and x. An important notable outcome of our study is the formation of Se8 rings at lower temperatures. Our experimental results further provide interesting optical features, thermally and compositionally tunable optical absorption spectra. Detailed structure specific FIR data at room temperature also present direct information on the structural units in consistent with Raman data. We foresee that our studies are useful in determining the lightinduced response of these films and also for their potential applications in optics and optoelectronics.

Khan, Pritam; Joshy, Abin; Sathe, Vasant; Deshpande, Uday; Adarsh, K V

2015-01-01T23:59:59.000Z

307

Wideband saturable absorption in few-layer molybdenum diselenide (MoSe2) for Q-switching Yb-, Er- and Tm-doped fiber lasers  

E-Print Network [OSTI]

We fabricate a free-standing molybdenum diselenide (MoSe2) saturable absorber by embedding liquid-phase exfoliated few-layer MoSe2 flakes into a polymer film. The MoSe2-polymer composite is used to Q-switch fiber lasers based on ytterbium (Yb), erbium (Er) and thulium (Tm) gain fiber, producing trains of microsecond-duration pulses with kilohertz repetition rates at 1060 nm, 1566 nm and 1924 nm, respectively. Such operating wavelengths correspond to sub-bandgap saturable absorption in MoSe2, which is explained in the context of edge-states, building upon studies of other semiconducting transition metal dichalcogenide (TMD)-based saturable absorbers. Our work adds few-layer MoSe2 to the growing catalog of TMDs with remarkable optical properties, which offer new opportunities for photonic devices.

Woodward, R I; Runcorn, T H; Hu, G; Torrisi, F; Kelleher, E J R; Hasan, T

2015-01-01T23:59:59.000Z

308

NMR characterization of sulphur substitution effects in the KxFe2-ySe2-zSz high-Tc superconductor  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

We present a?? Se NMR study of the effect of S substitution in the high-Tc superconductor KxFe2-ySe2-zSz in a temperature range up to 250 K. We examine two S concentrations, with z=0.8 (Tc~ 26 K) and z=1.6 (nonsuperconducting). The samples containing sulphur exhibit broader NMR line shapes than the KxFe?Se? sample due to local disorder in the Se environment. Our Knight shift ??K data indicate that in all samples, uniform spin susceptibility decreases with temperature, and that the magnitude of the Knight shift itself decreases with increased S concentration. In addition, S substitution progressively suppresses low-frequency spin fluctuations. None of the samples exhibit an enhancement of low-frequency antiferromagnetic spin fluctuations near Tc in 1/T?T, as seen in FeSe.

Torchetti, D. A.; Imai, T.; Lei, H. C.; Petrovic, C.

2012-04-01T23:59:59.000Z

309

Structural investigation on Ge{sub x}Sb{sub 10}Se{sub 90?x} glasses using x-ray photoelectron spectra  

SciTech Connect (OSTI)

The structure of Ge{sub x}Sb{sub 10}Se{sub 90?x} glasses (x?=?7.5, 10, 15, 20, 25, 27.5, 30, and 32.5 at. %) has been investigated by x-ray photoelectron spectroscopy (XPS). Different structural units have been extracted and characterized by decomposing XPS core level spectra, the evolution of the relative concentration of each structural unit indicates that, the relative contributions of Se-trimers and Se-Se-Ge(Sb) structure decrease with increasing Ge content until they become zero at chemically stoichiometric glasses of Ge{sub 25}Sb{sub 10}Se{sub 65}, and then the homopolar bonds like Ge-Ge and Sb-Sb begin to appear in the spectra. Increase of homopolar bonds will extend band-tails into the gap and narrow the optical band gap. Thus, the glass with a stoichiometric composition generally has fewer defective bonds and larger optical bandgap.

Wei, Wen-Hou [Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia); Department of Applied Physics, Chongqing University, Chongqing 401331 (China); Xiang, Shen [College of Information Science and Engineering, Ningbo University, Ningbo 315211 (China); Xu, Si-Wei; Wang, Rong-Ping, E-mail: rongping.wang@anu.edu.au [Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia); Fang, Liang [Department of Applied Physics, Chongqing University, Chongqing 401331 (China)

2014-05-14T23:59:59.000Z

310

Singlet and triplet states of trions in ZuSe-based quantum wells probed by magnetic fields to 50 Tesla  

SciTech Connect (OSTI)

Singlet and triplet states of positively (X{sup +}) and negatively (X{sup -}) charged excitons in ZnSe-based quantum wells have been studied by means of photoluminescence in pulsed magnetic fields up to 50 T. The binding energy of the X{sup -} singlet state shows a monotonic increase with magnetic field with a tendency to saturation, while that of the X{sup +} slightly decreases. The triplet X{sup +} and X{sup -} states, being unbound at zero magnetic field, noticeably increase their binding energy in high magnetic fields. The experimental evidence for the interaction between the triplet and singlet states of lTions leading to their anticrossing in magnetic fields has been found.

Astakhov, G. V.; Yakovlev, D. R.; Crooker, S. A. (Scott A.); Barrick, T. (Todd); Dzyubenko, A. B.; Sander, Thomas; Kochereshko, V. P.; Ossau, W.; Faschinger, W.; Waag, A.

2002-01-01T23:59:59.000Z

311

Nuclear Structure Relevant to Neutrinoless Double Beta Decay: the Valence Protons in 76Ge and 76Se  

E-Print Network [OSTI]

The possibility of observing neutrinoless double beta decay offers the opportunity of determining the effective neutrino mass if the nuclear matrix element were known. Theoretical calculations are uncertain and the occupations of valence orbits by nucleons active in the decay are likely to be important. The occupation of valence proton orbits in the ground states of 76Ge, a candidate for such decay, and 76Se, the corresponding daughter nucleus, were determined by precisely measuring cross sections for proton-removing transfer reactions. As in previous work on neutron occupations, we find that the Fermi surface for protons is much more diffuse than previously thought, and the occupancies of at least three orbits change significantly between the two 0+ ground states.

B. P. Kay; J. P. Schiffer; S. J. Freeman; T. Adachi; J. A. Clark; C. M. Deibel; H. Fujita; Y. Fujita; P. Grabmayr; K. Hatanaka; D. Ishikawa; H. Matsubara; Y. Meada; H. Okamura; K. E. Rehm; Y. Sakemi; Y. Shimizu; H. Shimoda; K. Suda; Y. Tameshige; A. Tamii; C. Wrede

2008-10-22T23:59:59.000Z

312

Nuclear structure relevant to neutrinoless double {beta} decay: The valence protons in {sup 76}Ge and {sup 76}Se  

SciTech Connect (OSTI)

The possibility of observing neutrinoless double {beta} decay offers the opportunity of determining the effective neutrino mass if the nuclear matrix element were known. Theoretical calculations are uncertain, and the occupation of valence orbits by nucleons active in the decay is likely to be important. The occupation of valence proton orbits in the ground states of {sup 76}Ge, a candidate for such decay, and {sup 76}Se, the corresponding daughter nucleus, is determined by precisely measuring cross sections for proton-removing transfer reactions. As in previous work on neutron occupation, we find that the Fermi surface for protons is much more diffuse than previously thought, and the occupancies of at least three orbits change significantly between the two 0{sup +} ground states.

Kay, B. P.; Schiffer, J. P.; Rehm, K. E. [Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Freeman, S. J. [University of Manchester, Manchester M13 9PL (United Kingdom); Adachi, T.; Fujita, H.; Hatanaka, K.; Ishikawa, D.; Matsubara, H.; Okamura, H.; Suda, K.; Tameshige, Y.; Tamii, A. [Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047 (Japan); Clark, J. A.; Deibel, C. M.; Wrede, C. [Yale University, New Haven, Connecticut 06520 (United States); Fujita, Y. [Department of Physics, Osaka University, Toyonaka, Osaka 567-0043 (Japan); Grabmayr, P. [Physikalisches Institut, Universitaet Tuebingen, D-72076 Tuebingen (Germany); Meada, Y. [Department of Applied Physics, Miyazaki University, Miyazaki 889-2192 (Japan); Sakemi, Y. [Cyclotron Radioisotope Center, Tohoku University, Sendai, Miyagi 980-8578 (Japan)] (and others)

2009-02-15T23:59:59.000Z

313

Nuclear structure relevant to neutrinoless double {beta} decay : the valence protons in {sup 76}Ge and {sup 76}Se.  

SciTech Connect (OSTI)

The possibility of observing neutrinoless double {beta} decay offers the opportunity of determining the effective neutrino mass if the nuclear matrix element were known. Theoretical calculations are uncertain, and the occupation of valence orbits by nucleons active in the decay is likely to be important. The occupation of valence proton orbits in the ground states of {sup 76}Ge, a candidate for such decay, and {sup 76}Se, the corresponding daughter nucleus, is determined by precisely measuring cross sections for proton-removing transfer reactions. As in previous work on neutron occupation, we find that the Fermi surface for protons is much more diffuse than previously thought, and the occupancies of at least three orbits change significantly between the two 0{sup +} ground states.

Kay, B. P.; Schiffer, J. P.; Freeman, S. J.; Adachi, T.; Clark, J. A.; Deibel, C. M.; Fujita, H.; Fujita, Y.; Grabmayr, P.; Hatanaka, K.; Ishikawa, D.; Matsubara, H.; Meada, Y.; Okamura, H.; Rehm, K. E.; Sakemi, T.; Shimizu, Y.; Shimoda, H.; Suda, K.; Tameshige, Y.; Tamii, A.; Wrede, C.; Univ. of Manchester; Osaka Univ.; Yale Univ.; Univ. of Tuebingen; Miyazaki Univ.; Tohoku Univ.; Univ. of Tokyo; Kyushu Univ.

2009-01-01T23:59:59.000Z

314

Demonstrations of diode-pumped and grating-tuned ZnSe:Cr{sup 2+} lasers. Revision 1  

SciTech Connect (OSTI)

A diode-side-pumped ZnSe:Cr{sup 2+} laser was operated with a 75 - Watt peak power 1.65 {micro}m InGaAsP/InP pump array. The laser was configured with a ``single-bounce`` architecture to maximize its round-trip gain. Peak output powers of {approx}0.3 Watt were obtained with a 10% - transmitting output coupler and a lightly-doped crystal. The estimated ``mode fill`` of {approx}0.06 will increase with Cr{sup 2+} concentration, raising the output power and extraction efficiency. With a grating tuner and MgF{sub 2}:Co{sup 2+} laser pumping, the laser tuned throughout the 2134 - 2799 nm range.

Page, R.H.; Skidmore, J.A.; Schaffers, K.I.; Beach, R.J.; Payne, S.A.; Krupke, W.F.

1997-02-14T23:59:59.000Z

315

Electroluminescence and phototrigger effect in single crystals of GaS{sub x}Se{sub 1-x} alloys  

SciTech Connect (OSTI)

The effects of switching and electroluminescence as well as the interrelation between these effects in single crystals of GaS{sub x}Se{sub 1-x} alloys are detected and studied. It is established that the threshold voltage for switching depends on temperature, resistivity, and composition of alloys, and also on the intensity and spectrum of photoactive light. As a result, a phototrigger effect is observed; this effect arises under irradiation with light from the fundamental-absorption region. Electroluminescence is observed in the subthreshold region of the current-voltage characteristic; the electroluminescence intensity decreases drastically to zero as the sample is switched from a high-resistivity state to a low-resistivity state. Experimental data indicating that the electroluminescence and the switching effect are based on the injection mechanism (as it takes place in other layered crystals of the III-V type) are reported.

Kyazym-Zade, A. G., E-mail: bsu_aydin@yahoo.com; Salmanov, V. M.; Mokhtari, A. G.; Dadashova, V. V.; Agaeva, A. A. [Baku State University (Azerbaijan)

2008-05-15T23:59:59.000Z

316

CdS and CdS/CdSe sensitized ZnO nanorod array solar cells prepared by a solution ions exchange process  

SciTech Connect (OSTI)

Graphical abstract: - Highlights: • CdS and CdS/CdSe quantum dots are assembled on ZnO nanorods by ion exchange process. • The CdS/CdSe sensitization of ZnO effectively extends the absorption spectrum. • The performance of ZnO/CdS/CdSe cell is improved by extending absorption spectrum. - Abstract: In this paper, cadmium sulfide (CdS) and cadmium sulfide/cadmium selenide (CdS/CdSe) quantum dots (QDs) are assembled onto ZnO nanorod arrays by a solution ion exchange process for QD-sensitized solar cell application. The morphology, composition and absorption properties of different photoanodes were characterized with scanning electron microscope, transmission electron microscope, energy-dispersive X-ray spectrum and Raman spectrum in detail. It is shown that conformal and uniform CdS and CdS/CdSe shells can grow on ZnO nanorod cores. Quantum dot sensitized solar cells based on ZnO/CdS and ZnO/CdS/CdSe nanocable arrays were assembled with gold counter electrode and polysulfide electrolyte solution. The CdS/CdSe sensitization of ZnO can effectively extend the absorption spectrum up to 650 nm, which has a remarkable impact on the performance of a photovoltaic device by extending the absorption spectrum. Preliminary results show one fourth improvement in solar cell efficiency.

Chen, Ling; Gong, Haibo; Zheng, Xiaopeng; Zhu, Min; Zhang, Jun [Key Laboratory of Inorganic Functional Materials in Universities of Shandong, School of Materials Science and Engineering, University of Jinan, Jinan 250022, Shandong (China); Yang, Shikuan [Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802-6812 (United States); Cao, Bingqiang, E-mail: mse_caobq@ujn.edu.cn [Key Laboratory of Inorganic Functional Materials in Universities of Shandong, School of Materials Science and Engineering, University of Jinan, Jinan 250022, Shandong (China)

2013-10-15T23:59:59.000Z

317

Bright three-band white light generated from CdSe/ZnSe quantum dot-assisted Sr{sub 3}SiO{sub 5}:Ce{sup 3+},Li{sup +}-based white light-emitting diode with high color rendering index  

SciTech Connect (OSTI)

In this study, bright three-band white light was generated from the CdSe/ZnSe quantum dot (QD)-assisted Sr{sub 3}SiO{sub 5}:Ce{sup 3+},Li{sup +}-based white light-emitting diode (WLED). The CdSe/ZnSe core/shell structure was confirmed by energy dispersive x-ray spectroscopy and x-ray photoelectron spectroscopy. The CdSe/ZnSe QDs showed high quantum efficiency (79%) and contributed to the high luminous efficiency ({eta}{sub L}) of the fabricated WLED. The WLED showed bright natural white with excellent color rendering property ({eta}{sub L}=26.8 lm/W, color temperature=6140 K, and color rendering index=85) and high stability against the increase in forward bias currents from 20 to 70 mA.

Jang, Ho Seong; Kwon, Byoung-Hwa; Jeon, Duk Young [Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701 (Korea, Republic of); Yang, Heesun [Department of Materials Science and Engineering, Hongik University, 72-1, Sangsu-dong, Mapo-gu, Seoul 121-791 (Korea, Republic of)

2009-10-19T23:59:59.000Z

318

Reactivity studies of a pseudo three-coordinate vanadium(II) complex: Synthesis of terminal oxo and sulfido complexes of vanadium(IV) and S?S and Se?Se reductive bond cleavage reactions  

SciTech Connect (OSTI)

Terminal oxo and sulfido complexes in the form of (nacnac)V=E(Ntol{sub 2}) (nacnac = [ArNC(CH{sub 3})]{sub 2}CH{sup -}, Ar = 2,6-(CHMe{sub 2}){sub 2}C{sub 6}H{sub 3}, Ntol{sub 2} = {sup -}N(C{sub 6}H{sub 4}-4-Me), E = O (1), S (2)) were isolated from treatment of the masked three-coordinate vanadium(II) complex, (nacnac)V(Ntol{sub 2}), with C{sub 5}H{sub 5}NO and S{sub 8}, respectively. Both vanadium(IV) species, 1 and 2, have been characterized by room temperature X-band EPR spectroscopic studies, and in the case of complex 1, a single crystal molecular structure confirmed the presence of a terminal oxo moiety. Moreover, reaction of (nacnac)V(Ntol{sub 2}) with diphenyl-disulfide and diphenyl-diselenide results in the reductive cleavage of these compounds to produce the vanadium(III) complexes (nacnac)V(XPh)(Ntol{sub 2}) (X = S, (3), Se (4)). A molecular structure of the phenylsulfide complex, 3, confirmed formation of the d{sup 2} complex resulting from reductive cleavage of the S-S bond.

Tran, Ba L.; Chen, Chun-Hsing; Mindiola, Daniel J. (Indiana)

2012-02-07T23:59:59.000Z

319

Electronic Structure of the Topological Insulator Bi[subscript 2]Se[subscript 3] Using Angle-Resolved Photoemission Spectroscopy: Evidence for a Nearly Full Surface Spin Polarization  

E-Print Network [OSTI]

We performed high-resolution spin- and angle-resolved photoemission spectroscopy studies of the electronic structure and the spin texture on the surface of Bi[subscript 2]Se[subscript 3], a model TI. By tuning the photon ...

Pan, Z.-H.

320

Atomic and electronic structures of single-layer FeSe on SrTiO3(001): The role of oxygen deficiency  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

Using first-principles calculation, we propose an interface structure for single triple-layer FeSe on the SrTiO3(001) surface, a high-Tc superconductor found recently. The key component of this structure is the oxygen deficiency on the top layer of the SrTiO3 substrate, as a result of Se etching used in preparing the high-Tc samples. The O vacancies strongly bind the FeSe triple layer to the substrate giving rise to a (2×1) reconstruction, as observed by scanning tunneling microscopy. The enhanced binding correlates to the significant increase of Tc observed in experiment. The O vacancies also serve as the source of electron doping, which modifies the Fermi surface of the first FeSe layer by filling the hole pocket near the center of the surface Brillouin zone, as suggested from angle-resolved photoemission spectroscopy measurement.

Bang, Junhyeok; Li, Zhi; Sun, Y. Y.; Samanta, Amit; Zhang, Y. Y.; Zhang, Wenhao; Wang, Lili; Chen, X.; Ma, Xucun; Xue, Q.-K.; Zhang, S. B.

2013-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" 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

X-ray diffraction study of (TlInSe{sub 2}){sub 1-x}(TlGaTe{sub 2}){sub x} crystal system  

SciTech Connect (OSTI)

The crystallographic and dynamic characteristics of TlInSe{sub 2} and TlGaTe{sub 2} crystals have been studied by X-ray diffraction in the temperature range of 85-320 K. The temperature dependences of the unit-cell parameters a of TlInSe{sub 2} and TlGaTe{sub 2} crystals, as well as their coefficients of thermal expansion along the [100] direction, are determined. The concentration dependences of the unit-cell parameters a and c for (TlInSe{sub 2}){sub 1-x}(TlGaTe{sub 2}){sub x} crystals are measured. Anomalies are found in the temperature dependences of the unit-cell parameters a and, correspondingly, the coefficient of thermal expansion, indicating the existence of phase transitions in TlInSe{sub 2} and TlGaTe{sub 2} crystals.

Sheleg, A. U., E-mail: sheleg@ifttp.bas-net.by; Zub, E. M.; Yachkovskii, A. Ya. [National Academy of Sciences of Belarus, State Scientific and Production Association, Scientific and Practical Materials Research Center (Belarus); Mustafaeva, S. N.; Kerimova, E. M. [Azerbaijan National Academy of Sciences, Institute of Physics (Azerbaijan)

2012-03-15T23:59:59.000Z

322

Recombination luminescence and trap levels in undoped and Al-doped ZnO thin films on quartz and GaSe (0 0 0 1) substrates  

SciTech Connect (OSTI)

Highlights: Black-Right-Pointing-Pointer ZnO films on GaSe create electron trapping states and PL recombination levels. Black-Right-Pointing-Pointer Zn and Al diffusion in GaSe produces low-energy widening of its PL emission. Black-Right-Pointing-Pointer ZnO:Al films on GaSe lamellas are suitable for gas-discharge lamp applications. -- Abstract: Photoluminescence spectra of ZnO and ZnO:Al (1.00, 2.00 and 5.00 at.%) films on GaSe (0 0 0 1) lamellas and amorphous quartz substrates, obtained by annealing, at 700 K, of undoped and Al-doped metal films, are investigated. For all samples, the nonequilibrium charge carriers recombine by radiative band-to-band transitions with energy of 3.27 eV, via recombination levels created by the monoionized oxygen atoms, forming the impurity band laying in the region 2.00 - 2.70 eV. Al doping induces an additional recombination level at 1.13 eV above the top of the valence band of ZnO films on GaSe substrates. As a result of thermal diffusion of Zn and Al into the GaSe interface layer from ZnO:Al/GaSe heterojunction, electron trap levels located at 0.22 eV and 0.26 eV below the conduction band edge of GaSe, as well as a deep recombination level, responsible for the luminescent emission in the region 1.10 - 1.40 eV, are created.

Evtodiev, I. [Moldova State University, 60 A. Mateevici Str., Chisinau, MD 2009, Republic of Moldova (Moldova, Republic of)] [Moldova State University, 60 A. Mateevici Str., Chisinau, MD 2009, Republic of Moldova (Moldova, Republic of); Caraman, I. [Vasile Alecsandri University of Bacau, 157 Calea Marasesti, RO 600115 Bacau (Romania)] [Vasile Alecsandri University of Bacau, 157 Calea Marasesti, RO 600115 Bacau (Romania); Leontie, L., E-mail: lleontie@uaic.ro [Alexandru Ioan Cuza University of Iasi, Bd. Carol I, Nr. 11, RO 700506 Iasi (Romania); Rusu, D.-I. [Vasile Alecsandri University of Bacau, 157 Calea Marasesti, RO 600115 Bacau (Romania)] [Vasile Alecsandri University of Bacau, 157 Calea Marasesti, RO 600115 Bacau (Romania); Dafinei, A. [Faculty of Physics, University of Bucharest, Platforma Magurele, Str. Fizicienilor nr. 1, CP Mg - 11, Bucharest-Magurele, RO 76900 (Romania)] [Faculty of Physics, University of Bucharest, Platforma Magurele, Str. Fizicienilor nr. 1, CP Mg - 11, Bucharest-Magurele, RO 76900 (Romania); Nedeff, V.; Lazar, G. [Vasile Alecsandri University of Bacau, 157 Calea Marasesti, RO 600115 Bacau (Romania)] [Vasile Alecsandri University of Bacau, 157 Calea Marasesti, RO 600115 Bacau (Romania)

2012-03-15T23:59:59.000Z

323

Mesoporous TiO2 beads for high efficiency CdS/ CdSe quantum dot co-sensitized solar cells  

E-Print Network [OSTI]

) as a derivative of dye-sensitized solar cells (DSCs) have attracted considerable attention and been regardedMesoporous TiO2 beads for high efficiency CdS/ CdSe quantum dot co-sensitized solar cells Ru Zhou for a CdS/CdSe quantum dot (QD) co-sensitized solar cell, which was constructed with the mesoporous TiO2

Cao, Guozhong

324

ZnO/ZnS(O,OH)/Cu(In,Ga)Se2/Mo SOLAR CELL WITH 18.6% EFFICIENCY M.A. Contreras, 2  

E-Print Network [OSTI]

) photovoltaic technology is motivated primarily by the potential to enhance solar cell current generationZnO/ZnS(O,OH)/Cu(In,Ga)Se2/Mo SOLAR CELL WITH 18.6% EFFICIENCY 1 M.A. Contreras, 2 T. Nakada, 2 M of 18.6% for Cu(In,Ga)Se2 solar cells that incorporate a ZnS(O,OH) buffer layer as an alternative to Cd

Sites, James R.

325

Stereo-Active Lone-Pair Control on the Ferromagnetic Behavior in VO(SeO2OH)2:A new acentric ferromagnetic material  

SciTech Connect (OSTI)

A new acentric ferromagnetic material, VO(SeO{sub 2}OH){sub 2}, has been synthesized and characterized by single crystal X-ray diffraction, second harmonic generation (SHG), and magnetization measurements. The crystal structure of VO(SeO{sub 2}OH){sub 2} consists of linear chains of corner-shared V{sup 4+}O{sub 6} octahedra that are connected by SeO{sub 2}OH groups. The material exhibits a weak SHG efficiency, comparable to {alpha}-SiO{sub 2}, and a ferromagnetic transition (T{sub C}) at 2.5 K with a saturated magnetic moment of 1.09 {mu}B per formula unit ({mu}B/FU). The origin of the ferromagnetism is explained by the suppression of the antiferromagnetic superexchange (SE) and supersuper-exchange (SSE) interactions in the intra-chain and inter-chain magnetic interactions, respectively. In addition, using first principles density functional theory (DFT) calculations, we show that the SSE interactions depend on the O(2)-Se{sup 4+}-O(3) angle. As we demonstrate, the stereoactive lone-pair on Se{sup 4+} is the driving force for the inter-chain ferromagnetic interactions.

Kim, Sang-Hwan [University of Houston, Houston; Yeon, J [University of Houston, Houston; Safa-Sefat, Athena [ORNL; Mandrus, David [ORNL; Halasyamani, P Shiv [University of Houston, Houston

2010-01-01T23:59:59.000Z

326

Effect of the magnetic phase transition on the charge transport in layered semiconductor ferromagnets TlCrS{sub 2} and TlCrSe{sub 2}  

SciTech Connect (OSTI)

TlCrS{sub 2} and TlCrSe{sub 2} crystals were synthesized by solid-state reaction. X-ray diffraction analysis showed that TlCrS{sub 2} and TlCrSe{sub 2} compounds crystallize in the hexagonal crystal system with lattice parameters a = 3.538 A, c = 21.962 A, c/a {approx} 6.207, z = 3; a = 3.6999 A, c = 22.6901 A, c/a {approx} 6.133, z = 3; and X-ray densities {rho}{sub x} = 6.705 and 6.209 g/cm{sup 3}, respectively. Magnetic and electric studies in a temperature range of 77-400 K showed that TlCrS{sub 2} and TlCrSe{sub 2} are semiconductor ferromagnets. Rather large deviations of the experimental effective magnetic moment of TlCrS{sub 2} (3.26 {mu}{sub B}) and TlCrSe{sub 2} (3.05 {mu}{sub B}) from the theoretical one (3.85 {mu}{sub B}) are attributed to two-dimensional magnetic ordering in the paramagnetic region of strongly layered ferromagnets TlCrS{sub 2} and TlCrSe{sub 2}. The effect of the magnetic phase's transition on the charge transport in TlCrS{sub 2} and TlCrSe{sub 2} is detected.

Veliyev, R. G.; Sadikhov, R. Z.; Kerimova, E. M., E-mail: ekerimova@physics.ab.az; Asadov, Yu. G.; Jabbarov, A. I. [Azerbaijan National Academy of Sciences, Institute of Physics (Azerbaijan)

2009-09-15T23:59:59.000Z

327

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

328

Improved Energy Conversion Efficiency in Wide-Bandgap Cu(In,Ga)Se2 Solar Cells: Preprint  

SciTech Connect (OSTI)

This report outlines improvements to the energy conversion efficiency in wide bandgap (Eg>1.2 eV) solar cells based on CuIn1-xGaxSe2. Using (a) alkaline containing high temperature glass substrates, (b) elevated substrate temperatures 600?C-650?C and (c) high vacuum evaporation from elemental sources following NREL's three-stage process, we have been able to improve the performance of wider bandgap solar cells with 1.218% for absorber bandgaps ~1.30 eV and efficiencies ~16% for bandgaps up to ~1.45 eV. In comparing J-V parameters in similar materials, we establish gains in the open-circuit voltage and, to a lesser degree, the fill factor value, as the reason for the improved performance. The higher voltages seen in these wide gap materials grown at high substrate temperatures may be due to reduced recombination at the grain boundary of such absorber films. Solar cell results, absorber materials characterization, and experimental details are reported.

Contreras, M.; Mansfield, L.; Egaas, B.; Li, J.; Romero, M.; Noufi, R.; Rudiger-Voigt, E.; Mannstadt, W.

2011-07-01T23:59:59.000Z

329

Structural, Optical and Electrical Properties of PbSe Nanocrystal Solids Treated Thermally or with Simple Amines  

SciTech Connect (OSTI)

We describe the structural, optical, and electrical properties of films of spin-cast, oleate-capped PbSe nanocrystals that are treated thermally or chemically in solutions of hydrazine, methylamine, or pyridine to produce electronically coupled nanocrystal solids. Postdeposition heat treatments trigger nanocrystal sintering at {approx}200 C, before a substantial fraction of the oleate capping group evaporates or pyrolyzes. The sintered nanocrystal films have a large hole density and are highly conductive. Most of the amine treatments preserve the size of the nanocrystals and remove much of the oleate, decreasing the separation between nanocrystals and yielding conductive films. X-ray scattering, X-ray photoelectron and optical spectroscopy, electron microscopy, and field-effect transistor electrical measurements are used to compare the impact of these chemical treatments. We find that the concentration of amines adsorbed to the NC films is very low in all cases. Treatments in hydrazine in acetonitrile remove only 2-7% of the oleate yet result in high-mobility n-type transistors. In contrast, ethanol-based hydrazine treatments remove 85-90% of the original oleate load. Treatments in pure ethanol strip 20% of the oleate and create conductive p-type transistors. Methylamine- and pyridine-treated films are also p-type. These chemically treated films oxidize rapidly in air to yield, after short air exposures, highly conductive p-type nanocrystal solids. Our results aid in the rational development of solar cells based on colloidal nanocrystal films.

Law, M.; Luther, J. M.; Song, Q.; Hughes, B. K.; Perkins, C. L.; Nozik, A. J.

2008-01-01T23:59:59.000Z

330

The influence of {gamma}-ray radiation on electrical properties of CuGaSe{sub 2}  

SciTech Connect (OSTI)

The effect of {gamma}-ray radiation on the conductivity of low-resistivity (10{sup 2}2-10{sup 4} {Omega} cm) and high-resistivity (10{sup 5}-10{sup 7} {Omega} cm) CuGaSe{sub 2} single crystals has been studied in the temperature range 77-330 K. It is found that the resistivity of low-resistivity samples increases as the dose of {gamma}-ray radiation is increased, while the resistivity of high-resistivity samples is practically independent of the radiation dose. It is assumed that a decrease in the conductivity of the low-resistivity samples occurs owing to scattering of free charge carriers at defects (charged centers) formed as a result of irradiation with {gamma}-ray photons. It is found that the dose of the {gamma}-ray irradiation does not affect the temperature dependence of resistivity in the low- and high-resistivity samples in the temperature range 77-300 K.

Kasumoglu, I.; Kerimova, T. G., E-mail: ktaira@physics.ab.az; Mamedova, I. A. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2011-01-15T23:59:59.000Z

331

Electron-beam induced variation of surface profile in amorphous As{sub 20}Se{sub 80} films  

SciTech Connect (OSTI)

Unusual profile variation of holographic surface relief gratings is detected in thin (2??m) As{sub 20}Se{sub 80} chalcogenide films under e-beam irradiation: gratings of small periods were smoothed, whereas the gratings of larger periods increased their amplitudes. Irradiation was carried out in SEM, with 20?kV voltage and 8?nA current; the profiles of the irradiated areas were analyzed both by AFM and SEM. It is found that the kinetics of both flattening and growth followed by exponential law and took place due to lateral mass transport accelerated by e-irradiation. It is shown that the profile variation is mainly caused by competition between capillary forces and “chemical” forces induced by broken and deformed atomic bonds under e-beam irradiation. The kinetics of profile variation was calculated assuming that the mechanism of e-beam induced mass transfer is volume diffusion. The diffusion coefficients were estimated from the experimental data using theoretical expressions derived.

Kaganovskii, Yu., E-mail: kagany@mail.biu.ac.il, E-mail: trunov.m@gmail.com [Department of Physics, Bar-Ilan University, Ramat-Gan 52900 (Israel); Trunov, M. L., E-mail: kagany@mail.biu.ac.il, E-mail: trunov.m@gmail.com [Uzhgorod National University, Narodna sq. 3, Uzhgorod 88000 (Ukraine); Cserhati, C.; Beke, D. L. [Department of Solid State Physics, University of Debrecen, Bem sqr. 18/b, H-4026 Debrecen (Hungary); Lytvyn, P. M. [Institute of Semiconductor Physics, NAS of Ukraine, Kiev 03028 (Ukraine); Kökényesi, S. [Department of Experimental Physics, University of Debrecen, Bem sqr. 18/b, H-4026 Debrecen (Hungary)

2014-05-14T23:59:59.000Z

332

Understanding the electronic structure of CdSe quantum dot-fullerene (C{sub 60}) hybrid nanostructure for photovoltaic applications  

SciTech Connect (OSTI)

By using the density-functional tight binding method, we studied the electronic structure of CdSe quantum dot(QD)-buckminsterfullerene (C{sub 60}) hybrid systems as a function of both the size of the QD and concentration of the fullerene molecule. Our calculation reveals that the lowest unoccupied molecular orbital energy level of the hybrid CdSeQD-C{sub 60} systems lies on the fullerene moiety, whereas the highest occupied molecular orbital (HOMO) energy level lies either on the QD or the fullerene depending on size of the CdSe QD. We explored the possibility of engineering the energy level alignment by varying the size of the CdSe QD. With increase in size of the QD, the HOMO level is shifted upward and crosses the HOMO level of the C{sub 60}-thiol molecule resulting transition from the type-I to type-II band energy alignment. The density of states and charge density plot support these types of band gap engineering of the CdSe-C{sub 60} hybrid systems. This type II band alignment indicates the possibility of application of this nanohybrid for photovoltaic purpose.

Sarkar, Sunandan; Rajbanshi, Biplab; Sarkar, Pranab, E-mail: pranab.sarkar@visva-bharati.ac.in [Department of Chemistry, Visva-Bharati University, Santiniketan 731235 (India)

2014-09-21T23:59:59.000Z

333

Composition-optimized TiO{sub 2}/CdS{sub x}Se{sub 1-x} core/shell nanowire arrays for photoelectrochemical hydrogen generation  

SciTech Connect (OSTI)

Core/shell heterostructured TiO{sub 2}/CdS{sub x}Se{sub 1-x} nanowire arrays (NWAs) were prepared via physical vapor deposition of CdS{sub x}Se{sub 1-x} layer onto the hydrothermal pre-grown TiO{sub 2} NWAs with FTO as conductive substrate. By change the sulfur content (x) in the TiO{sub 2}/CdS{sub x}Se{sub 1-x} nano-composites, it was observed that the light absorption edge can be gradually tuned within a broad wavelength from 540 to 710?nm. When used as photoanodes for hydrogen generation, the as-prepared TiO{sub 2}/CdS{sub x}Se{sub 1-x} NWAs show much higher photoelectroncatalytic activity than the pristine TiO{sub 2} NWAs. Moreover, the TiO{sub 2}/CdS{sub x}Se{sub 1-x} photoelectrode with x?=?0.52 exhibited the highest photocurrent level and outstanding stability, which is more suitable for long-time hydrogen generation. This study may be useful in the design of alloy hetrostructure photoelectrodes with optimal chemical composition toward the more efficient solar conversion devices.

Ai, Guanjie; Mo, Rong; Xu, Hang; Chen, Qian; Yang, Sui; Li, Hongxing, E-mail: hongxinglee@xtu.edu.cn; Zhong, Jianxin [Hunan Key Laboratory for Micro-Nano Energy Materials and Devices, School of Physics and Optoelectronics, Xiangtan University, Hunan 411105 (China)

2014-11-07T23:59:59.000Z

334

The influence of air temperature inversions on snowmelt and glacier mass-balance simulations, Ammassalik island, SE Greenland  

SciTech Connect (OSTI)

In many applications, a realistic description of air temperature inversions is essential for accurate snow and glacier ice melt, and glacier mass-balance simulations. A physically based snow-evolution modeling system (SnowModel) was used to simulate eight years (1998/99 to 2005/06) of snow accumulation and snow and glacier ice ablation from numerous small coastal marginal glaciers on the SW-part of Ammassalik Island in SE Greenland. These glaciers are regularly influenced by inversions and sea breezes associated with the adjacent relatively low temperature and frequently ice-choked fjords and ocean. To account for the influence of these inversions on the spatiotemporal variation of air temperature and snow and glacier melt rates, temperature inversion routines were added to MircoMet, the meteorological distribution sub-model used in SnowModel. The inversions were observed and modeled to occur during 84% of the simulation period. Modeled inversions were defined not to occur during days with strong winds and high precipitation rates due to the potential of inversion break-up. Field observations showed inversions to extend from sea level to approximately 300 m a.s.l., and this inversion level was prescribed in the model simulations. Simulations with and without the inversion routines were compared. The inversion model produced air temperature distributions with warmer lower elevation areas and cooler higher elevation areas than without inversion routines due to the use of cold sea-breeze base temperature data from underneath the inversion. This yielded an up to 2 weeks earlier snowmelt in the lower areas and up to 1 to 3 weeks later snowmelt in the higher elevation areas of the simulation domain. Averaged mean annual modeled surface mass-balance for all glaciers (mainly located above the inversion layer) was -720 {+-} 620 mm w.eq. y{sup -1} for inversion simulations, and -880 {+-} 620 mm w.eq. y{sup -1} without the inversion routines, a difference of 160 mm w.eq. y{sup -1}. The annual glacier loss for the two simulations was 50.7 x 10{sup 6} m{sup 3} y{sup -1} and 64.4 x 10{sup 6} m{sup 3} y{sup -1} for all glaciers - a difference of {approx}21%. The average equilibrium line altitude (ELA) for all glaciers in the simulation domain was located at 875 m a.s.l. and at 900 m a.s.l. for simulations with or without inversion routines, respectively.

Mernild, Sebastian Haugard [Los Alamos National Laboratory; Liston, Glen [COLORADO STATE UNIV.

2009-01-01T23:59:59.000Z

335

The energy band structure of A{sub x}Fe{sub 2}Se{sub 2} (A = K, Rb) superconductors  

SciTech Connect (OSTI)

We study the band structure of antiferromagnetic A{sub x}Fe{sub 2}Se{sub 2} (A = K, Rb) superconductors by using first-principles electronic structure calculations which is density functional theory. In the vicinity of iron-vacancy, we identify the valence electrons of A{sub x}Fe{sub 2}Se{sub 2} will be filled up to the Fermi level and no semiconducting gap is observed. Hence, the A{sub x}Fe{sub 2}Se{sub 2} is a metallic instead of semiconducting which leads to superconductivity in the orbital-selective Mott phase. Similarly, there is non-vanishing density of states at the Fermi level.

Zabidi, Noriza A. [Physics Department, Centre for Defence Foundation Studies, Universiti Pertahanan Nasional Malaysia, Kuala Lumpur 59200 (Malaysia); Azhan, Muhd. Z. [Defence Science Department, Faculty of Defence Science and Technology, Universiti Pertahanan Nasional Malaysia, Kuala Lumpur 59200 (Malaysia); Rosli, A. N. [Faculty of Science and Technology, Universiti Sains Islam Malaysia, Nilai 71800, Negeri Sembilan (Malaysia); Shrivastava, Keshav N. [School of Physics, University of Hyderabad, Hyderabad 500046 (India)

2014-03-05T23:59:59.000Z

336

Syntheses, crystal structures and optical properties of the first strontium selenium(IV) and tellurium(IV) oxychlorides: Sr{sub 3}(SeO{sub 3})(Se{sub 2}O{sub 5})Cl{sub 2} and Sr{sub 4}(Te{sub 3}O{sub 8})Cl{sub 4}  

SciTech Connect (OSTI)

Two new quaternary strontium selenium(IV) and tellurium(IV) oxychlorides, namely, Sr{sub 3}(SeO{sub 3})(Se{sub 2}O{sub 5})Cl{sub 2} and Sr{sub 4}(Te{sub 3}O{sub 8})Cl{sub 4}, have been prepared by solid-state reaction. Sr{sub 3}(SeO{sub 3})(Se{sub 2}O{sub 5})Cl{sub 2} features a three-dimensional (3D) network structure constructed from strontium(II) interconnected by Cl{sup -}, SeO{sub 3}{sup 2-} as well as Se{sub 2}O{sub 5}{sup 2-} anions. The structure of Sr{sub 4}(Te{sub 3}O{sub 8})Cl{sub 4} features a 3D network in which the strontium tellurium oxide slabs are interconnected by bridging Cl{sup -} anions. The diffuse reflectance spectrum measurements and results of the electronic band structure calculations indicate that both compounds are wide band-gap semiconductors. - Graphical abstract: Solid-state reactions of SrO, SrCl{sub 2}, and SeO{sub 2} or TeO{sub 2} in different molar ratios and under different temperatures lead to two new strontium selenium(IV) or tellurium(IV) oxychlorides with two different types of structures, namely, Sr{sub 3}(SeO{sub 3})(Se{sub 2}O{sub 5})Cl{sub 2} and Sr{sub 4}(Te{sub 3}O{sub 8})Cl{sub 4}. Both compounds are wide band-gap semiconductors based on the diffuse reflectance spectra and the electronic band structures.

Jiang Hailong [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002 (China); Graduate School of the Chinese Academy of Sciences, Beijing 100039 (China); Mao Jianggao [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002 (China)], E-mail: mjg@fjirsm.ac.cn

2008-02-15T23:59:59.000Z

337

Syntheses, crystal structures and characterizations of BaZn(SeO{sub 3}){sub 2} and BaZn(TeO{sub 3})Cl{sub 2}  

SciTech Connect (OSTI)

Two new barium zinc selenite and tellurite, namely, BaZn(SeO{sub 3}){sub 2} and BaZn(TeO{sub 3})Cl{sub 2}, have been synthesized by the solid state reaction. The structure of BaZn(SeO{sub 3}){sub 2} features double chains of [Zn(SeO{sub 3}){sub 2}]{sup 2-} anions composed of four- and eight-member rings which are alternatively along a-axis. The double chains of [Zn{sub 2}(TeO{sub 3}){sub 2}Cl{sub 3}]{sup 3-} anions in BaZn(TeO{sub 3})Cl{sub 2} are formed by Zn{sub 3}Te{sub 3} rings in which each tellurite group connects with three ZnO{sub 3}Cl tetrahedra. BaZn(SeO{sub 3}){sub 2} and BaZn(TeO{sub 3})Cl{sub 2} are wide bandgap semiconductors based on optical diffuse reflectance spectrum measurements. -- Graphical abstract: Two new barium zinc selenite and tellurite, namely, BaZn(SeO{sub 3}){sub 2} and BaZn(TeO{sub 3})Cl{sub 2}, have been synthesized by solid state reaction. The structure of BaZn(SeO{sub 3}){sub 2} features 1D double chains of [Zn(SeO{sub 3}){sub 2}]{sup 2-} anions composed of four- and eight-member rings which are alternatively along a-axis. The 1D double chains of [Zn{sub 2}(TeO{sub 3}){sub 2}Cl{sub 3}]{sup 3-} anions in BaZn(TeO{sub 3})Cl{sub 2} are formed by Zn{sub 3}Te{sub 3} rings in which each tellurite group connects with one ZnO{sub 3}Cl and two ZnO{sub 2}Cl{sub 2} tetrahedra. BaZn(SeO{sub 3}){sub 2} and BaZn(TeO{sub 3})Cl{sub 2} are wide bandgap semiconductors based on optical diffuse reflectance spectrum measurements.

Jiang Hailong [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and the Graduate School of the Chinese Academy of Sciences, Fuzhou 350002 (China); Feng Meiling [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and the Graduate School of the Chinese Academy of Sciences, Fuzhou 350002 (China); Mao Jianggao [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and the Graduate School of the Chinese Academy of Sciences, Fuzhou 350002 (China)]. E-mail: mjg@ms.fjirsm.ac.cn

2006-06-15T23:59:59.000Z

338

First Direct Double-Beta Decay Q-value Measurement of 82Se in Support of Understanding the Nature of the Neutrino  

E-Print Network [OSTI]

In anticipation of results from current and future double-beta decay studies, we report a measurement resulting in a 82Se double-beta decay Q-value of 2997.9(3) keV, an order of magnitude more precise than the currently accepted value. We also present preliminary results of a calculation of the 82Se neutrinoless double-beta decay nuclear matrix element that corrects in part for the small size of the shell model single-particle space. The results of this work are important for designing next generation double-beta decay experiments and for the theoretical interpretations of their observations.

David L. Lincoln; Jason D. Holt; Georg Bollen; Maxime Brodeur; Scott Bustabad; Jonathan Engel; Samuel J. Novario; Matthew Redshaw; Ryan Ringle; Stefan Schwarz

2012-11-24T23:59:59.000Z

339

First Direct Double- Decay Q-Value Measurement of 82Se in Support of Understanding the Nature of the Neutrino  

SciTech Connect (OSTI)

In anticipation of results from current and future double- decay studies, we report a measurement resulting in a 82Se double- decay Q value of 2997.9(3) keV, an order of magnitude more precise than the currently accepted value. We also present preliminary results of a calculation of the 82Se neutrinoless double- decay nuclear matrix element that corrects in part for the small size of the shell model single-particle space. The results of this work are important for designing next generation double- decay experiments and for the theoretical interpretations of their observations.

Lincoln, David L. [NSCL, Michigan State University, East Lansing; Holt, Jason D. [Technische Univ. Darmstadt/GSI/UTK/ORNL; Bollen, Georg [NSCL, Michigan State University, East Lansing; Brodeur, Maxime [NSCL, Michigan State University, East Lansing; Bustabad, Scott [NSCL, Michigan State University, East Lansing; Engel, Jonathan [University of North Carolina, Chapel Hill; Novario, Samuel J. [NSCL, Michigan State University, East Lansing; Redshaw, Matthew [NSCL, Michigan State Univ.,/Central Michigan Univ.-Mt. Pleasant; Ringle, Ryan [NSCL, Michigan State University, East Lansing; Schwarz, Stefan [NSCL, Michigan State University, East Lansing

2013-01-01T23:59:59.000Z

340

Lead (II) selenite halides Pb{sub 3}(SeO{sub 3}){sub 2}X{sub 2} (X = Br, I): Synthesis and crystal structure  

SciTech Connect (OSTI)

Two lead selenite halides, Pb{sub 3}(SeO{sub 3}){sub 2}Br{sub 2} and Pb{sub 3}(SeO{sub 3}){sub 2}I{sub 2}, have been prepared by solid-phase synthesis and structurally characterized. These compounds are isotypic and can be considered 3D with a microporous framework composed of lead polyhedra (distorted Archimedean antiprisms formed by oxygen and halogen atoms). The framework contains channels oriented in the [010] direction. These channels contain selenium atoms, which are bound with framework oxygen atoms belonging to different lead polyhedra.

Berdonosov, P. S., E-mail: berdonosov@inorg.chem.msu.ru; Olenev, A. V.; Dolgikh, V. A. [Moscow State University (Russian Federation)

2012-03-15T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" from the National Library of EnergyBeta (NLEBeta).
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341

Solar-energy conversion by combined photovoltaic converters with CdTe and CuInSe{sub 2} base layers  

SciTech Connect (OSTI)

The possibility of the combined use of bifacial thin-film solar cells based on CdTe and frontal solar cells with a CuInSe{sub 2} base layer in tandem structures is experimentally confirmed. It is found that, for the use of bifacial solar cells based on cadmium telluride in a tandem structure, the optimal thickness of their base layer should be 1 ?m. The gain in the efficiency of the tandem structure, compared with an individual CuInSe{sub 2}-based solar cell, is 1.8% in the case of series-connected solar cells and 1.3%, for parallel-connected.

Khrypunov, G. S., E-mail: khrip@ukr.net; Sokol, E. I. [National Technical University “Kharkiv Polytechnic Institute” (Ukraine); Yakimenko, Yu. I. [National Technical University “Kyiv Polytechnic Institute”, Research Institute of Applied Electronics (Ukraine); Meriuts, A. V. [National Technical University “Kharkiv Polytechnic Institute” (Ukraine); Ivashuk, A. V. [National Technical University “Kyiv Polytechnic Institute”, Research Institute of Applied Electronics (Ukraine); Shelest, T. N. [National Technical University “Kharkiv Polytechnic Institute” (Ukraine)

2014-12-15T23:59:59.000Z

342

STUDEN T FIN ANCIAL AID AND SCHO LARSHIP S SE RVICE SUPPO RT SUCC ESS 1278 University of Oregon, Eugene OR 97403-1278 http://financialaid.uoregon.edu  

E-Print Network [OSTI]

STUDEN T FIN ANCIAL AID AND SCHO LARSHIP S SE RVICE SUPPO RT SUCC ESS 1278 University of Oregon #12;STUDEN T FIN ANCIAL AID AND SCHO LARSHIP S SE RVICE SUPPO RT SUCC ESS 1278 University of Oregon

Oregon, University of

343

Experiencing Maya Palaces: Royal Power, Space, and Architecture at Holmul, Guatemala  

E-Print Network [OSTI]

headquarters. The stucco and plaster facades of ancient Mayafrom the formerly white plaster (Schele 1985:37). The colorwere found, all beneath plaster floors, and all children.

Mongelluzzo, Ryan

2011-01-01T23:59:59.000Z

344

Dancing in the Altiplano : K'iche' Maya culture in motion in contemporary highland Guatemala  

E-Print Network [OSTI]

Photo courtesy of James Rodriguez at mimundo.org…………………….175I would like to thank James Rodriguez at mimundo.org for thePhoto courtesy of  James Rodriguez  at mimundo.org. Gilberto

Taube, Rhonda Beth

2009-01-01T23:59:59.000Z

345

Needs Assessment of Agricultural, Environmental, and Social Systems of Small Farmers in Chimaltenango, Guatemala  

E-Print Network [OSTI]

an ?I? was used and ?FG? for focus groups. In addition, a random number was assigned to each participant. Names with own codes were keep in a separate notebook. Data were transferred from field notes to electronic documents. In addition...

Oleas, Carolina

2011-02-22T23:59:59.000Z

346

An evaluation of the geothermal potential of the Tecuamburro Volcano area of Guatemala  

SciTech Connect (OSTI)

Radiometric ages indicate that the Tecuamburro Volcano and three adjacent lava domes grew during the last 38,300 years, and that a 360-m-wide phreatic crater, Laguna Ixpaco, was formed near the base of these domes about 2900 years ago. Laguna Ixpaco is located within the Chupadero crater, from which pyroxene pumice deposits were erupted 38,300 years ago. Thus, the likelihood is great for a partly molten or solid-but-still-hot near-surface intrusion beneath the area. Fumaroles and hot springs issue locally from the Tecuamburro volcanic complex and near Laguna Ixpaco. Analyses of gas and fluid samples from these and other nearby thermal manifestations yield chemical-geothermometer temperatures of about 150{degree} to 300{degree}C, with the highest temperatures at Ixpaco. The existence of a commercial-grade geothermal reservoir beneath the Ixpaco area seems likely. 84 refs., 70 figs., 12 tabs.

Heiken, G.; Duffield, W. (eds.)

1990-09-01T23:59:59.000Z

347

Results of investigations at the Zunil geothermal field, Guatemala: Well logging and brine geochemistry  

SciTech Connect (OSTI)

The well logging team from Los Alamos and its counterpart from Central America were tasked to investigate the condition of four producing geothermal wells in the Zunil Geothermal Field. The information obtained would be used to help evaluate the Zunil geothermal reservoir in terms of possible additional drilling and future power plant design. The field activities focused on downhole measurements in four production wells (ZCQ-3, ZCQ-4, ZCQ-5, and ZCQ-6). The teams took measurements of the wells in both static (shut-in) and flowing conditions, using the high-temperature well logging tools developed at Los Alamos National Laboratory. Two well logging missions were conducted in the Zunil field. In October 1988 measurements were made in well ZCQ-3, ZCQ-5, and ZCQ-6. In December 1989 the second field operation logged ZCQ-4 and repeated logs in ZCQ-3. Both field operations included not only well logging but the collecting of numerous fluid samples from both thermal and nonthermal waters. 18 refs., 22 figs., 7 tabs.

Adams, A.; Dennis, B.; Van Eeckhout, E.; Goff, F.; Lawton, R.; Trujillo, P.E.; Counce, D.; Archuleta, J. (Los Alamos National Lab., NM (USA)); Medina, V. (Instituto Nacional de Electrificacion, Guatemala City (Guatemala). Unidad de Desarollo Geotermico)

1991-07-01T23:59:59.000Z

348

SHIFTING PERCEPTIONS OF SACRED SPACES: CEREMONIAL REUSE OF MAYA ARCHITECTURE AND MONUMENTS AT SAN BARTOLO, GUATEMALA  

E-Print Network [OSTI]

The ancient Maya site of San Bartolo experienced a decidedly turbulent history that is characterized by several phases of occupation and abandonment. This research illustrates how the San Bartolo community reacted, responded, ...

Craig, Jessica H.

2010-04-27T23:59:59.000Z

349

Unexpected victories : protecting workers' rights in Guatemala's apparel-for-export sector  

E-Print Network [OSTI]

This thesis examines three surprise victories for workers' rights in the Guatemalan garment sector. In the past three years, three unions have formed at the Choishin, Cimatextiles, and Nobland factories and each has ...

Connolly, Sarah E., 1977-

2004-01-01T23:59:59.000Z

350

ReadyMade Analysis of Hospital de la Familia’s Cataract Surgery Program in Guatemala  

E-Print Network [OSTI]

Center for Work, Technology, and Society, IRLE University ofCenter for Work, Technology, and Society, UC Berkeley, to

Brown, Clair; Freeman, Eric; Belohlav, Kate; Chait, Ariel; Thal, Lawrence

2012-01-01T23:59:59.000Z

351

Living on Scorched Earth: the Political Ecology of Land Ownership in Guatemala's Northern Lowlands  

E-Print Network [OSTI]

for development as an ecotourism site. As the weeks went on,about our chosen ecotourism site. This particular waterfallAlta Verapaz, a French ecotourism operator, and I are all

Ybarra, Megan

2010-01-01T23:59:59.000Z

352

Guatemala-Low-Carbon Energy for Central America: Building a Regional Model  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision hasInformation Earth's Heat Jump to:Photon Place:Net Jump Agency/Company /Organization International|

353

The comadrona and response to obstetrical emergencies : maternal mortality in highland Guatemala  

E-Print Network [OSTI]

inequalities, poor education, sanitation, environmentalsanitation, and clean water are major factors in the poor

Copeland, Margaret Hemphill

2011-01-01T23:59:59.000Z

354

Community health club and its application for health promotion and community building in Matazano, Guatemala  

E-Print Network [OSTI]

phones. Despite this remittance income, these families continue to struggle with the same poor water quality and sanitation 54 | JOURNAL OF UNDERGRADUATE RESEARCH as their neighbors. These absences have also begun to impact the familial... this participatory method in this particular community given the history of the project to is supported by the World Health Organization as a strategy to reduce poor health worldwide, and definitely should be considered for long-term community development...

Lewis, Karen S.

2014-04-01T23:59:59.000Z

355

PUBLISHED ONLINE: 10 MAY 2009 | DOI: 10.1038/NPHYS1270 Topological insulators in Bi2Se3, Bi2Te3 and Sb2Te3  

E-Print Network [OSTI]

ARTICLES PUBLISHED ONLINE: 10 MAY 2009 | DOI: 10.1038/NPHYS1270 Topological insulators in Bi2Se3-Liang Qi3 , Xi Dai1 , Zhong Fang1 and Shou-Cheng Zhang3 * Topological insulators are new states of quantum of topologically protected states in two-dimensional and three-dimensional band insulators with large spin

Loss, Daniel

356

Discovery of a Topological Insulator Bi2Se3 with a Single Surface Dirac Cone. (DMR-0819860) IRG-A: M. Z. Hasan and R. J. Cava  

E-Print Network [OSTI]

Discovery of a Topological Insulator Bi2Se3 with a Single Surface Dirac Cone. (DMR-0819860) IRG field is applied. Recent research has uncovered a new class of insulators, called topological insulators spectroscopy (ARPES). In a new breakthrough, Hasan and Cava have now identified a second Topological Insulator

Petta, Jason

357

Synthesis and structure of Cs[UO{sub 2}(SeO{sub 4})(OH)] . nH{sub 2}O (n = 1.5 or 1)  

SciTech Connect (OSTI)

The synthesis and single-crystal X-ray diffraction study of Cs[UO{sub 2}(SeO{sub 4})(OH)] . 1.5H{sub 2}O (I) and Cs[UO{sub 2}(SeO{sub 4})(OH)] . H{sub 2}O (II) are performed. Compound I crystallizes in the monoclinic crystal system, a = 7.2142(2) A, b = 14.4942(4) A, c = 8.9270(3) A, {beta} = 112.706(1){sup o}, space group P2{sub 1}/m, Z = 4, and R = 0.0222. Compound II is monoclinic, a = 8.4549(2) A, b = 11.5358(3) A, c = 9.5565(2) A, {beta} = 113.273(1){sup o}, space group P2{sub 1}/c, Z = 4, and R = 0.0219. The main structural units of crystals I and II are [UO{sub 2}(SeO{sub 4})(OH)]{sup -} layers which belong to the AT{sup 3}M{sup 2} crystal chemical group of uranyl complexes (A = UO{sub 2}{sup 2+}, T{sup 3} = SeO{sub 4}{sup 2-}, and M{sup 2} = OH{sup -}). In structure I, johannite-like layers are found. Structure II is a topological isomer of I. The two structures differ in the number of U(VI) atoms bound to the central atom by all bridging ligands.

Serezhkina, L. B., E-mail: lserezh@ssu.samara.ru [Samara State University (Russian Federation); Peresypkina, E. V.; Virovets, A. V. [Russian Academy of Sciences, Institute of Inorganic Chemistry, Siberian Branch (Russian Federation); Pushkin, D. V.; Verevkin, A. G. [Samara State University (Russian Federation)

2010-05-15T23:59:59.000Z

358

Oceanography | March 2012 213 O C E AN I C SPR E A D I N G CENT E R PRO C E S SE S |  

E-Print Network [OSTI]

G R A M R E SE A RCH On the Potential for Bioenergy and Biofuels from Hydrothermal Vent Microbes are also well suited for bioenergy and biofuel production. Here, we discuss the utility and issues- scale biofuel production. IN SITU BIOENERGY GENERATION In the early twentieth century, scientists found

Girguis, Peter R.

359

Size-Dependent Optical and Electrochemical Energy Gaps Comparison of CdSe Nanolusters Meghan B. Teunis, Katie N. Lawrence, and Sukanta Dolai  

E-Print Network [OSTI]

Size-Dependent Optical and Electrochemical Energy Gaps Comparison of CdSe Nanolusters Meghan B, a comparison of the size dependent optical properties and electrochemical energy gaps of poly(ethylene glycol-dependent optical and electronic properties of semiconductor nanocrystals have made them the focus of much research

Zhou, Yaoqi

360

Atomic and electronic structures of single-layer FeSe on SrTiO3(001): The role of oxygen deficiency  

SciTech Connect (OSTI)

Using first-principles calculation, we propose an interface structure for single triple-layer FeSe on the SrTiO3(001) surface, a high-Tc superconductor found recently. The key component of this structure is the oxygen deficiency on the top layer of the SrTiO3 substrate, as a result of Se etching used in preparing the high-Tc samples. The O vacancies strongly bind the FeSe triple layer to the substrate giving rise to a (2×1) reconstruction, as observed by scanning tunneling microscopy. The enhanced binding correlates to the significant increase of Tc observed in experiment. The O vacancies also serve as the source of electron doping, which modifies the Fermi surface of the first FeSe layer by filling the hole pocket near the center of the surface Brillouin zone, as suggested from angle-resolved photoemission spectroscopy measurement.

Bang, Junhyeok; Li, Zhi; Sun, Y. Y.; Samanta, Amit; Zhang, Y. Y.; Zhang, Wenhao; Wang, Lili; Chen, X.; Ma, Xucun; Xue, Q.-K.; Zhang, S. B.

2013-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" 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

Die Civil Academy ist ein gemeinsames Programm von BBE und BP Europa SE. Trger und Veranstalter der Civil Academy ist die BBE Geschftsstelle gemeinntzige GmbH.  

E-Print Network [OSTI]

Die Civil Academy ist ein gemeinsames Programm von BBE und BP Europa SE. Träger und Veranstalter der Civil Academy ist die BBE Geschäftsstelle gemeinnützige GmbH. Ausschreibung der 18. Civil Academy Civil Academy ­ Gutes auch gut tun! Du willst mit einer kreativen Idee die Welt zum Besseren verändern

Reyle, Uwe

362

Structural and chemical investigations of CBD-and PVD-CdS buffer layers and interfaces in Cu(In,Ga)Se2-based thin film solar cells  

E-Print Network [OSTI]

(In,Ga)Se2-based thin film solar cells D. Abou-Rasa,b,*, G. Kostorza , A. Romeob,1 , D. Rudmannb , A Available online 8 December 2004 Abstract It is known that high-efficiency thin film solar cells based on Cu; Chemical bath deposition; CdS buffer 1. Introduction The highest efficiencies for thin film solar cells

Romeo, Alessandro

363

Structural and dynamical properties of Bridgman-grown CdSe[subscript x]Te[subscript 1?x] (0  

E-Print Network [OSTI]

Measurements of the Raman scattering and extended x-ray-absorption fine-structure (EXAFS) spectroscopy are reported on a series of Bridgman-grown zinc-blende CdTe[subscript 1?x]Se[subscript x] (0.35 ? x > 0.05) ternary ...

Talwar, Devki N.

364

Characterization of Damp-Heat Degradation of CuInGaSe2 Solar Cell Components and Devices by (Electrochemical) Impedance Spectroscopy: Preprint  

SciTech Connect (OSTI)

This work evaluated the capability of (electrochemical) impedance spectroscopy (IS, or ECIS as used here) to monitor damp heat (DH) stability of contact materials, CuInGaSe2 (CIGS) solar cell components, and devices. Cell characteristics and its variation of the CIGS devices were also examined by the ECIS.

Pern, F. J. J.; Noufi, R.

2011-09-01T23:59:59.000Z

365

Page 262 Courses: Astronomy (ASTR) Sonoma State University 2013-2014 Catalog AStr 396 SeLeCted topiCS in AStronoMy (1-3)  

E-Print Network [OSTI]

Page 262 Courses: Astronomy (ASTR) Sonoma State University 2013-2014 Catalog AStr 396 SeLeCted topiCS in AStronoMy (1-3) Lecture, 1-3 hours. A course of lectures on a single topic or set of related topics not ordinarily covered in the Astronomy curriculum. The course may be repeated for credit with a different topic

Ravikumar, B.

366

Courses: Astronomy (ASTR) Page 259Sonoma State University 2012-2013 Catalog ASTR 482 Adv ObSeRvATiOnAl ASTROnOmy (2)  

E-Print Network [OSTI]

Courses: Astronomy (ASTR) Page 259Sonoma State University 2012-2013 Catalog ASTR 482 Adv ObSeRvATiOnAl ASTROnOmy (2) Lecture, 1 hour; laboratory, 3 hours. A study of advanced observing techniques including astronomy. Both written and oral presentations (including a demonstration of the experiment or activity

Ravikumar, B.

367

The Behaviour of STeel ColumnS in fire Material -Cross-seCtional CapaCity -ColuMn BuCkling  

E-Print Network [OSTI]

The Behaviour of STeel ColumnS in fire Material - Cross-seCtional CapaCity - ColuMn BuIch december 2012 #12;#12;Structural stability and the general behaviour of steel structures can be described during a fire influence the behaviour of steel structures markedly. Significant advances have been made

Giger, Christine

368

PHYSICAL REVIEW B 83, 104526 (2011) Fe Mossbauer study of magnetic ordering in superconducting K0.80Fe1.76Se2.00 single crystals  

E-Print Network [OSTI]

PHYSICAL REVIEW B 83, 104526 (2011) 57 Fe M¨ossbauer study of magnetic ordering in superconducting 31 March 2011) The magnetic ordering of superconducting single crystals of K0.80Fe1.76Se2.00 has been studied between 10 and 550 K using 57 Fe M¨ossbauer spectroscopy. Despite being superconducting below Tsc

Ryan, Dominic

2011-01-01T23:59:59.000Z

369

Journal of Solid State Chemistry 180 (2007) 28772884 Cs4P2Se10: A new compound discovered with the application of  

E-Print Network [OSTI]

,b , Ratnasabapathy G. Iyera , Mercouri G. Kanatzidisa,b,1 , David P. Welikya,Ã a Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA b Department of Chemistry, Northwestern University by quenching the melt in ice water, and Cs4P2Se10 was recovered upon annealing. The static 31 P NMR spectrum

Weliky, David

2007-01-01T23:59:59.000Z

370

Microscale solar cells for high concentration on polycrystalline Cu(In,Ga)Se2 Myriam Paire,1,2,3,4,a)  

E-Print Network [OSTI]

Microscale solar cells for high concentration on polycrystalline Cu(In,Ga)Se2 thin films Myriam experiments on polycrystalline thin film solar cells. High level regime is reached, thanks to the micrometric grids are used on concentrator solar cells. The grid coverage is a trade-off between the decreased

Paris-Sud XI, Université de

371

Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3  

SciTech Connect (OSTI)

Films of iron selenide (FeSe) one unit cell thick grown on strontium titanate (SrTiO3 or STO) substrates have recently shown superconducting energy gaps opening at temperatures close to the boiling point of liquid nitrogen (77 K), which is a record for the iron-based superconductors. The gap opening temperature usually sets the superconducting transition temperature Tc, as the gap signals the formation of Cooper pairs, the bound electron states responsible for superconductivity. To understand why Cooper pairs form at such high temperatures, we examine the role of the SrTiO3 substrate. Here we report high-resolution angle-resolved photoemission spectroscopy results that reveal an unexpected characteristic of the single-unit-cell FeSe/SrTiO3 system: shake-off bands suggesting the presence of bosonic modes, most probably oxygen optical phonons in SrTiO3, which couple to the FeSe electrons with only a small momentum transfer. Such interfacial coupling assists superconductivity in most channels, including those mediated by spin fluctuations. Our calculations suggest that this coupling is responsible for raising the superconducting gap opening temperature in single-unit-cell FeSe/SrTiO3.

Lee, J.J.; Schmitt, F.T.; Moore, R.G.; Johnston, S.; Cui, Y.-T.; Li, W.; Yi, M.; Liu, Z.K.; Hashimoto, M.; Zhang, Y.; Lu, D.H.; Devereaux, T.P.; Lee, D.-H.; Shen, Z.-X.

2014-11-12T23:59:59.000Z

372

Biologa Sinttica, una nueva disciplina altamente prometedora Para aquellos que an no sepan qu es la Biologa Sinttica, se trata de un rea de carcter  

E-Print Network [OSTI]

produzcan las circunstancias fisiológicas que requieran su participación, y fomentará la bioenergía mediante laboratorio. Básicamente, se trata de una experiencia educativa única a nivel nacional, que permite a los

Fernández de Córdoba, Pedro

373

Twin Cities Campus The Aurora Center for Advocacy & Education 128 Pleasant St. SE Office for Student Affairs Suite 117 Appleby Hall  

E-Print Network [OSTI]

Campus The Aurora Center for Advocacy & Education 128 Pleasant St. SE Office for Student Affairs Suite Prospective Volunteer, Thank you for your interest in being a volunteer with The Aurora Center for Advocacy and challenging work! The Aurora Center (TAC) provides free and confidential crisis intervention to victims

Blanchette, Robert A.

374

travers la surface de contact chaude du sulfate de cuivre vers l'acide sulfurique : le phnomne Peltier semblerait donc se  

E-Print Network [OSTI]

phénomène Peltier semblerait donc se pro- duire ici en sens contraire de ce que l'on observe soit pour deux qui permettent de s'assurer que le phénomène de Peltier n'est pas compliqué d'actions chimiques

Paris-Sud XI, Université de

375

2) Certaines des substances essayes noircissent le revtement en argent de la cuve ; les cellules se dessinent alors sur ce fond, le noir-  

E-Print Network [OSTI]

que celle présumée par la formule et la pile s'échauffait, tantôt plus grande, et la pile se'énergie dégagée par la réaction chimique, alors qu'elle devrait être égale à la différence de celle-ci et de l les effets parasites (effet Peltier et Thomson) s'an- nulent et n'aura ient pu ab

Paris-Sud XI, Université de

376

SYSTEM BIOLOGY & BIOINFORMATICS DOI: 10.5504/50YRTIMB.2011.0037 BIOTECHNOL. & BIOTECHNOL. EQ. 26/2012/SE 50 YEARS ROUMEN TSANEV INSTITUTE OF  

E-Print Network [OSTI]

membranes proposed by Helfrich (3) and Evans (1) describe the elastic energy per unit area of lipid membrane. & BIOTECHNOL. EQ. 26/2012/SE 50 YEARS ROUMEN TSANEV INSTITUTE OF SPECIAL EDITION/ON-LINE MOLECULAR BIOLOGY 06 of Solid State Physics, Bulgarian Academy of Sciences, Sofia, Bulgaria 2 University of Ljubljana, Faculty

Iglic, Ales

377

Topological insulators in Bi2Se3, Bi2Te3 and Sb2Te3 with a single Dirac cone on the surface  

SciTech Connect (OSTI)

Topological insulators are new states of quantum matter in which surface states residing in the bulk insulating gap of such systems are protected by time-reversal symmetry. The study of such states was originally inspired by the robustness to scattering of conducting edge states in quantum Hall systems. Recently, such analogies have resulted in the discovery of topologically protected states in two-dimensional and three-dimensional band insulators with large spin-orbit coupling. So far, the only known three-dimensional topological insulator is Bi{sub x}Sb{sub 1-x}, which is an alloy with complex surface states. Here, we present the results of first-principles electronic structure calculations of the layered, stoichiometric crystals Sb{sub 2}Te{sub 3}, Sb{sub 2}Se{sub 3}, Bi{sub 2}Te{sub 3} and Bi{sub 2}Se{sub 3}. Our calculations predict that Sb{sub 2}Te{sub 3}, Bi{sub 2}Te{sub 3} and Bi{sub 2}Se{sub 3} are topological insulators, whereas Sb{sub 2}Se{sub 3} is not. These topological insulators have robust and simple surface states consisting of a single Dirac cone at the point. In addition, we predict that Bi{sub 2}Se{sub 3} has a topologically non-trivial energy gap of 0.3 eV, which is larger than the energy scale of room temperature. We further present a simple and unified continuum model that captures the salient topological features of this class of materials.

Zhang, Haijun; /Beijing, Inst. Phys.; Liu, Chao-Xing; /Tsinghua U., Beijing; Qi, Xiao-Liang; /Stanford U., Phys. Dept.; Dai, Xi; Fang, Zhong; /Beijing, Inst. Phys.; Zhang, Shou-Cheng; /Stanford U., Phys. Dept.

2010-02-24T23:59:59.000Z

378

Synthesis, crystal structure and magnetic property of a new nickel selenite chloride: Ni{sub 5}(SeO{sub 3}){sub 4}Cl{sub 2}  

SciTech Connect (OSTI)

The new nickel selenite chloride, Ni{sub 5}(SeO{sub 3}){sub 4}Cl{sub 2}, was obtained by high-temperature solid state reaction of NiCl{sub 2}, Ni{sub 2}O{sub 3} and SeO{sub 2} in a 1:2:4molar ratio at 700{sup o}C in an evacuated quartz tube. Its structure was established by single-crystal X-ray diffraction. Ni{sub 5}(SeO{sub 3}){sub 4}Cl{sub 2} crystallizes in the triclinic system, space group P-1 (No. 2) with cell parameters of a=8.076(2), b=9.288(2), c=9.376(2)A, {alpha}=101.97(3), {beta}=105.60(3), {gamma}=91.83(3){sup o} and Z=2. All nickel(II) ions in Ni{sub 5}(SeO{sub 3}){sub 4}Cl{sub 2} are octahedrally coordinated by selenite oxygens or/and chloride anions (([Ni(1)O{sub 5}Cl], [Ni(2)O{sub 4}Cl{sub 2}], [Ni(3)O{sub 5}Cl], [Ni(4)O{sub 6}] and [Ni(5)O{sub 4}Cl]). The structure of the title compound features a condensed three-dimensional (3D) network built by Ni(II) ions interconnected by SeO{sub 3}{sup 2-} anions as well as Cl{sup -} anions. Magnetic property measurements show strong antiferromagnetic interaction between nickel(II) ions.

Shen Yueling [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and the Graduate School of the Chinese Academy of Sciences, Fuzhou 350002 (China); Mao Jianggao [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and the Graduate School of the Chinese Academy of Sciences, Fuzhou 350002 (China)]. E-mail: mjg@ms.fjirsm.ac.cn; Jiang Hailong [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and the Graduate School of the Chinese Academy of Sciences, Fuzhou 350002 (China)

2005-09-15T23:59:59.000Z

379

CuIn{sub 1{minus}{ital x}}Ga{sub {ital x}}Se{sub 2} and CdTe PV solar cells  

SciTech Connect (OSTI)

Higher indium proportion in the first precursor was employed to eliminate pits in CuIn{sub 1{minus}{ital x}}Ga{sub {ital x}}Se{sub 2} films prepared by two Se-vapor selenizations of metallic precursors. CuIn{sub 1{minus}{ital x}}Ga{sub {ital x}}Se{sub 2} films had large, faceted grains, and a near-optimum composition Cu:In:Ga:Se 24.25:22.21:4.40:49.14. Ga incorporated using a Cu-Ga(22 at. {percent}) alloy target was enhanced by optimizing the time-temperature profiles of selenizations. CuIn{sub 1{minus}{ital x}}Ga{sub {ital x}}Se{sub 2} solar cells gave {ital V}{sub oc} of 451.8 mV, {ital J}{sub sc} of 34.5 mA, FF of 57.87{percent}, total area efficiency of 9.02{percent}. CdTe thin films were prepared by heat treatment of magnetron-sputtered elemental Cd/Te stacks. Formation of extraneous oxide phases was avoided by optimizing ambients, temperature, and CdCl{sub 2} treatment. CdTe solar cells gave maximum {ital V}{sub oc} of {approximately}600 mV, {ital J}{sub sc} of {approximately}5 mA.cm{sup {minus}2}, very low FF and efficiency probably due to blocking layer or junction away from CdS{backslash}CdTe interface. {copyright} {ital 1996 American Institute of Physics.}

Dhere, N.G. [Florida Solar Energy Center, 300 State Rd 401, Cape Canaveral, Florida 32920-4099 (United States)

1996-01-01T23:59:59.000Z

380

Synthesis, characterization, and anomalous dielectric and conductivity performance of one-dimensional (bdaH)InSe{sub 2} (bda = 1,4-butanediamine)  

SciTech Connect (OSTI)

Graphical abstract: Anomalous dielectric and conductivity performance have been observed in the organic-containing indium selenide (bdaH)InSe{sub 2}, which are attributed to the water molecules existing in the crystal boundary rather than phase transition. Highlights: {yields} The title compound is the first example of organic-containing one-dimensional indium selenide. {yields} The anomalous dielectric peak is attributed to water molecules in crystal boundary. {yields} The inorganic and organic components of the title compound are connected via hydrogen bonding to form a supramolecular three-dimensional network. -- Abstract: A new indium selenide, namely (bdaH)InSe{sub 2} (1) (bda = 1,4-butanediamine) has been solvothermally synthesized and structurally characterized. It belongs to the non-centrosymmetric space group Fdd2. Its structure features an infinite one-dimensional anionic chain of [InSe{sub 2}]{sub n}{sup n-} with monoprotonated [bdaH]{sup +} as charge compensating cation. The organic [bdaH]{sup +} cations are joined into a supramolecular one-dimensional chain via N-H...N hydrogen bonding, which further interacts with the inorganic chain via N-H...Se and C-H...Se hydrogen bonding, forming a supramolecular three-dimensional network. Based on such a well-defined structure, the thermal stability, optical, conductivity, and dielectric properties were systematically investigated, showing that dielectric constant, as well as conductivity, had a hump at about 95 {sup o}C, which could be attributed to water molecules in the crystal boundary.

Du, Ke-Zhao; Hu, Wan-Biao [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China) [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China); Graduate School of the Chinese Academy of Sciences, Beijing 100049 (China); Hu, Bing; Guan, Xiang-Feng [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China)] [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China); Huang, Xiao-Ying, E-mail: xyhuang@fjirsm.ac.cn [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China)] [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China)

2011-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" 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

Cs{sub 4}P{sub 2}Se{sub 10}: A new compound discovered with the application of solid-state and high temperature NMR  

SciTech Connect (OSTI)

The new compound Cs{sub 4}P{sub 2}Se{sub 10} was serendipitously produced in high purity during a high-temperature synthesis done in a nuclear magnetic resonance (NMR) spectrometer. {sup 31}P magic angle spinning (MAS) NMR of the products of the synthesis revealed that the dominant phosphorus-containing product had a chemical shift of -52.8 ppm that could not be assigned to any known compound. Deep reddish brown well-formed plate-like crystals were isolated from the NMR reaction ampoule and the structure was solved with X-ray diffraction. Cs{sub 4}P{sub 2}Se{sub 10} has the triclinic space group P-1 with a=7.3587(11) A, b=7.4546(11) A, c=10.1420(15) A, {alpha}=85.938(2){sup o}, {beta}=88.055(2){sup o}, and {gamma}=85.609(2){sup o} and contains the [P{sub 2}Se{sub 10}]{sup 4-} anion. To our knowledge, this is the first compound containing this anion that is composed of two tetrahedral (PSe{sub 4}) units connected by a diselenide linkage. It was also possible to form a glass by quenching the melt in ice water, and Cs{sub 4}P{sub 2}Se{sub 10} was recovered upon annealing. The static {sup 31}P NMR spectrum at 350 deg. C contained a single peak with a -35 ppm chemical shift and a {approx}7 ppm peak width. This study highlights the potential of solid-state and high-temperature NMR for aiding discovery of new compounds and for probing the species that exist at high temperature. - Graphical abstract: The new compound Cs{sub 4}P{sub 2}Se{sub 10} was discovered following a high-temperature in situ synthesis in the NMR spectrometer and the structure was determined by single-crystal X-ray diffraction. It contains the new [P{sub 2}Se{sub 10}]{sup 4-} anion.

Gave, Matthew A.; Canlas, Christian G. [Department of Chemistry, Michigan State University, East Lansing, MI 48824 (United States); Chung, In [Department of Chemistry, Michigan State University, East Lansing, MI 48824 (United States); Department of Chemistry, Northwestern University, Evanston, IL 60208 (United States); Iyer, Ratnasabapathy G. [Department of Chemistry, Michigan State University, East Lansing, MI 48824 (United States); Kanatzidis, Mercouri G. [Department of Chemistry, Michigan State University, East Lansing, MI 48824 (United States); Department of Chemistry, Northwestern University, Evanston, IL 60208 (United States)], E-mail: m-kanatzidis@northwestern.edu; Weliky, David P. [Department of Chemistry, Michigan State University, East Lansing, MI 48824 (United States)], E-mail: weliky@chemistry.msu.edu

2007-10-15T23:59:59.000Z

382

Electronic Structure of the Topological Insulator Bi2Se3 Using Angle-Resolved Photoemission Spectroscopy: Evidence for a Nearly Full Surface Spin Polarization  

SciTech Connect (OSTI)

We performed high-resolution spin- and angle-resolved photoemission spectroscopy studies of the electronic structure and the spin texture on the surface of Bi{sub 2}Se{sub 3}, a model TI. By tuning the photon energy, we found that the topological surface state is well separated from the bulk states in the vicinity of k{sub z} = Z plane of the bulk Brillouin zone. The spin-resolved measurements in that region indicate a very high degree of spin polarization of the surface state, {approx}0.75, much higher than previously reported. Our results demonstrate that the topological surface state on Bi{sub 2}Se{sub 3} is highly spin polarized and that the dominant factors limiting the polarization are mainly extrinsic.

Pan, Z.H.; Vescovo, E.; Fedorov, A.V.; Gardner, D.; Lee, Y.S.; Chu, S.; Gu, G.D.; Valla, T.

2011-06-22T23:59:59.000Z

383

Measurement of the valence band-offset in a PbSe/ZnO heterojunction by x-ray photoelectron spectroscopy  

SciTech Connect (OSTI)

A heterojunction of PbSe/ZnO has been grown by molecular beam epitaxy. X-ray photoelectron spectroscopy was used to directly measure the valence-band offset (VBO) of the heterojunction. The VBO, {Delta}E{sub V}, was determined as 2.51 {+-} 0.05 eV using the Pb 4p{sup 3/2} and Zn 2p{sup 3/2} core levels as a reference. The conduction-band offset, {Delta}E{sub C}, was, therefore, determined to be 0.59 {+-} 0.05 eV based on the above {Delta}E{sub V} value. This analysis indicates that the PbSe/ZnO heterojunction forms a type I (Straddling Gap) heterostructure.

Li Lin; Qiu Jijun; Weng Binbin; Yuan Zijian; Shi Zhisheng [School of Electrical and Computer Engineering, University of Oklahoma, Norman, Oklahoma 73019 (United States); Li Xiaomin; Gan Xiaoyan [State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China); Sellers, Ian R. [Deparment of Physics, University of Oklahoma, Norman, Oklahoma 73019 (United States)

2012-12-24T23:59:59.000Z

384

Applying SE Methods Achieves Project Success to Evaluate Hammer and Fixed Cutter Grinders Using Multiple Varieties and Moistures of Biomass Feedstock for Ethanol Production  

SciTech Connect (OSTI)

Applying basic systems engineering (SE) tools to the mission analysis phases of a 2.5-million dollar biomass pre-processing project for the U.S. Department of Energy directly assisted the project principal investigator understand the complexity and identify the gaps of a moving-target project and capture the undefined technical/functional requirements and deliverables from the project team and industrial partners. A creative application of various SE tools by non-aerospace systems engineers developed an innovative “big picture” product that combined aspects of mission analysis with a project functional flow block diagram, providing immediate understanding of the depth and breath of the biomass preprocessing effort for all team members, customers, and industrial partners. The “big picture” diagram became the blue print to write the project test plan, and provided direction to bring the project back on track and achieve project success.

Larry R. Zirker; Christopher T. Wright, PhD; R. Douglas Hamelin

2008-06-01T23:59:59.000Z

385

Surface half-metallicity of CrS thin films and perfect spin filtering and spin diode effects of CrS/ZnSe heterostructure  

SciTech Connect (OSTI)

Recently, ferromagnetic zinc-blende Mn{sub 1?x}Cr{sub x}S thin films (above x?=?0.5) were fabricated experimentally on ZnSe substrate, which confirmed the previous theoretical prediction of half-metallic ferromagnetism in zinc-blende CrS. Here, we theoretically reveal that both Cr- and S-terminated (001) surfaces of the CrS thin films retain the half-metallicity. The CrS/ZnSe(001) heterogeneous junction exhibits excellent spin filtering and spin diode effects, which are explained by the calculated band structure and transmission spectra. The perfect spin transport properties indicate the potential applications of half-metallic CrS in spintronic devices. All computational results are obtained by using the density functional theory combined with nonequilibrium Green's function.

Gao, G. Y., E-mail: guoying-gao@mail.hust.edu.cn; Yao, K. L., E-mail: klyao@mail.hust.edu.cn [School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074 (China)

2014-11-03T23:59:59.000Z

386

Effect of {gamma}-ray radiation on electrical properties of heat-treated Tb{sub x}Sn{sub 1-x}Se single crystals  

SciTech Connect (OSTI)

The effect of {gamma}-ray radiation on the electrical properties of heat-treated Tb{sub 0.01}Sn{sub 0.99}Se (sample 1) and Tb{sub 0.05}Sn{sub 0.95}Se (sample 2) samples is studied. It is found that, as a result of irradiation with {gamma}-ray 1.25-MeV photons, the charge-carrier concentration decreases in the temperature range T = 77-200 K by 17 and 6.3% for samples 1 and 2, respectively. It is assumed that, in the course of irradiation with {gamma}-ray photons, terbium impurity atoms are located between sites of the crystal lattice; in addition, Frenkel defects are formed.

Huseynov, J. I., E-mail: cih_58@mail.ru; Jafarov, T. A. [Azerbaijan State Pedagogical University (Azerbaijan)

2012-04-15T23:59:59.000Z

387

Spectra of optical parameters in bulk and film amorphous alloys of the Se{sub 95}As{sub 5} system containing samarium (Sm) impurities  

SciTech Connect (OSTI)

Reflectance spectra of bulk and film amorphous alloys of the Se{sub 95}As{sub 5} system containing samarium (Sm) impurities are studied in the energy range of 1-6 eV. Spectral dependences of optical constants and derivatives of optical dielectric functions are calculated by the Kramers-Kronig method. Changes in spectra of optical parameters depending on the content of impurities introduced into Se{sub 95}As{sub 5} and conditions of their preparation are explained based on the cluster model. According to the latter, changes in the electron density of states depends on changes in atomic configurations in clusters, i.e., short-range order changes.

Djalilov, N. Z.; Damirov, G. M., E-mail: gafil@physics.ab.az [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2011-09-15T23:59:59.000Z

388

Bi{sub 6}(SeO{sub 3}){sub 3}O{sub 5}Br{sub 2}: A new bismuth oxo-selenite bromide  

SciTech Connect (OSTI)

A new bismuth oxo-selenite bromide Bi{sub 6}(SeO{sub 3}){sub 3}O{sub 5}Br{sub 2} was synthesized and structurally characterized. The crystal structure belongs to the triclinic system (space group P1-bar , Z=2, a=7.1253(7) A, b=10.972(1) A, c=12.117(1) A, {alpha}=67.765(7) Degree-Sign , {beta}=82.188(8) Degree-Sign , {gamma}=78.445(7) Degree-Sign ) and is unrelated to those of other known oxo-selenite halides. It can be considered as an open framework composed of BiO{sub x} or BiO{sub y}Br{sub z} polyhedrons forming channels running along [1 0 0] direction which contain the selenium atoms in pyramidal shape oxygen coordination (SeO{sub 3}E). The spectroscopic properties and thermal stability were studied. The new compound is stable up to 400 Degree-Sign C. - graphical abstract: New bismuth oxo-selenite bromide with new open framework structure. Highlights: Black-Right-Pointing-Pointer New bismuth oxo-selenite bromide was found and structurally characterized. Black-Right-Pointing-Pointer Bi{sub 6}(SeO{sub 3}){sub 3}O{sub 5}Br{sub 2} exhibit a new open framework structure type. Black-Right-Pointing-Pointer BiO{sub x} or BiO{sub y}Br{sub z} polyhedrons form channels in the structure which are decorated by [SeO{sub 3}E] groups.

Berdonosov, Peter S., E-mail: berdonosov@inorg.chem.msu.ru [Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow (Russian Federation); Olenev, Andrei V. [SineTheta Ltd., MSU Building 1-77, 119991 Moscow (Russian Federation)] [SineTheta Ltd., MSU Building 1-77, 119991 Moscow (Russian Federation); Kirsanova, Maria A. [Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow (Russian Federation)] [Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow (Russian Federation); Lebed, Julia B. [Institute for nuclear research RAS, 142190, Troitsk, Moscow region (Russian Federation)] [Institute for nuclear research RAS, 142190, Troitsk, Moscow region (Russian Federation); Dolgikh, Valery A. [Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow (Russian Federation)] [Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow (Russian Federation)

2012-12-15T23:59:59.000Z

389

Les agricultures familiales refltent une trs grande diversit. Elles se caractrisent par une multitude de techniques, une richesse de savoir-faire et par une savante combinaison  

E-Print Network [OSTI]

'arganiers, région de Tafraout, Maroc L'agriculture familiale ne saurait se passer de l'arbre et de la forêt. �pineux endémique du Maroc, l'arganier est parfaitement adapté à l'aridité. Les hommes ne le plantent pas mais 1998 « réserve de la biosphère » par l'Unesco. ©IRD-GenevièveMichon MAROC Les agricultures familiales

390

Single-crystal studies of the Chevrel-phase superconductor La{sub x}Mo{sub 6}Se{sub 8}. 2: Physical and superconducting properties  

SciTech Connect (OSTI)

Single crystals of La{sub x}Mo{sub 6}Se{sub 8} have been grown and some of their magnetic, transport, and superconducting properties studied. The electrical resistivity is characterized by its high value at room temperature, its low residual resistivity ratio, and a pronounced negative curvature at high temperatures. Comparison with the isostructural compounds Mo{sub 3}Se{sub 4} (Mo{sub 6}Se{sub 8}) and LaMo{sub 6}S{sub 8} shows that this behavior is due to structural as well as to extrinsic features (e.g., brittleness due to weak intercluster bondings). The position of the Fermi level near a peak of the density of states plays an important role in the normal-state physical properties, fixing the functional forms of both resistivity and magnetic susceptibility. The superconducting state is mainly characterized by a strong lanthanum concentration dependence of the critical temperature {Tc}, by quite definite granular effects, and by a very high critical field (H{sub c2}(0) {approximately} 55 T). The intragrain critical current density, as estimated by magnetic measurements, is relatively high (4 {times} 10{sup 4} A/cm{sup 2} at zero field and 1.7 K), three times larger than the one obtained for the void compound Mo{sub 3}Se{sub 4}. The fact is due to a higher density of pinning centers in the ternary compound because of microstructural features such as microcracks or crystal defects caused by the extreme brittleness of the crystals.

Pena, O.; Le Berre, F.; Padiou, J.; Marchand, T. [Univ. de Rennes I (France). Chimie du Solide et Inorganique Moleculaire] [Univ. de Rennes I (France). Chimie du Solide et Inorganique Moleculaire; Horyn, R.; Wojakowski, A. [Polish Academy of Sciences, Wroclaw (Poland). Inst. of Low Temperature and Structure Research] [Polish Academy of Sciences, Wroclaw (Poland). Inst. of Low Temperature and Structure Research

1998-03-01T23:59:59.000Z

391

Seminario "Divulgacin de conocimientos en ciencias de la nutricin" DESTINADO A: Se trata de una actividad enfocada a todos los estudiantes del Grado  

E-Print Network [OSTI]

Seminario "Divulgación de conocimientos en ciencias de la nutrición" DESTINADO A: Se trata de una a cualquier estudiante y profesional de ciencias de la salud, hasta completar aforo. FECHA y HORA: martes 17 de diciembre de 2013, de 16:00 a 18:00. LUGAR: Salón de grados de la Facultad de Ciencias de la Salud

Escolano, Francisco

392

Fully automated radiochemical preparation system for gamma-spectroscopy on fission products and the study of the intruder and vibrational levels in /sup 83/Se  

SciTech Connect (OSTI)

AUTOBATCH was developed to provide a usable source of short-lived neutron-rich nuclides through chemical preparation of the sample from fission products for detailed gamma-ray spectroscopy, which would complement the output of on-line isotope separators. With AUTOBATCH the gamma rays following the ..beta../sup -/ decay of /sup 83/As were studied to determine the ground state spin and parity of /sup 83/As to be 5/2/sup -/; the absolute intensity of the ..beta../sup -/ branch from /sup 83/As to /sup 83/Se/sup m/ to be 0.3%; the absolute intensity of the ground state ..beta../sup -/ branch from /sup 83/Se/sup m/ to /sup 83/Br to be 39%; the halflife of the 5/2/sub 1//sup +/ level to be 3.2 ns; and the structure of /sup 83/Se/sub 49/. Results are used to show that the intruder structure which had been previously observed in the odd mass /sub 49/In isotopes could be observed in the N = 49 isotones. The observed structure is discussed in terms of the unified model calculations of Heyde which has been used to describe the intruder structure in the indium nuclei. The intruder structure is most strongly developed, not at core mid-shell, /sup 89/Zr/sub 49/, but rather at core mid-sub-shell /sup 83/Se. This difference is qualitatively understood to be due to the blocking of collectivity by the Z = 40 subshell closure which prevents the intruder structure from occurring in /sup 87/Sr/sub 49/ and /sup 89/Zr/sub 49/.

Lien, O.G. III

1983-10-01T23:59:59.000Z

393

Distinct Fermi Surface Topology and Nodeless Superconducting Gap in a Tl0:58Rb0:42Fe1:72Se2 Superconductor  

E-Print Network [OSTI]

-based superconductors reported so far. The Fermi surface around the M point shows a nearly isotropic superconducting gap) superconductors [6]. It is important to explore whether the high-Tc superconductiv- ity mechanism in this new FeDistinct Fermi Surface Topology and Nodeless Superconducting Gap in a ðTl0:58Rb0:42�Fe1:72Se2

Tian, Weidong

394

Recent progress in commensurate-incommensurate phase transformations. [Hg/sub 3/-delta AsF/sub 6/; 2H polytype of TaSe/sub 2/  

SciTech Connect (OSTI)

Three topics are discussed. (1) the nature of long wavelength excitations in Hg/sub 3/-delta AsF/sub 6/, where gapless excitations in addition to the conventional acoustic modes are observed. (2) Thiourea, in which new commensurate phases can be induced by an external electric field. (3) Discommensurations in 2HTaSe/sub 2/, where recent electron diffraction and high resolution x-ray data combine with neutron results to establish a quite complex and subtle behavior. 9 figures.

Axe, J.D.

1982-08-01T23:59:59.000Z

395

NORMES D'ACTUACI EN CAS D'ACCIDENT 1. Els accidents hauran de justificar-se mitjanant la corresponent comunicaci  

E-Print Network [OSTI]

NORMES D'ACTUACI� EN CAS D'ACCIDENT 1. Els accidents hauran de justificar-se mitjançant la corresponent comunicació d'accident que haurà d'emplenar el club, entitat esportiva o empresa prenedora a la als serveis mèdics concertats és necessari aportar la comunicació d'accident certificada i identificar

Geffner, Hector

396

Surface and substrate induced effects on thin films of the topological insulators Bi2Se3 and Bi2Te3  

SciTech Connect (OSTI)

Based on van der Waals density functional calculations, we have studied few-quintuple-layer (QL) films of Bi2Se3 and Bi2Te3. The separation between the QLs near the surface is found to have a large increase after relaxation, whereas, the separation between the inner QLs is smaller and approaches the bulk value as the thickness grows, showing a two-dimensional to three-dimensional structural crossover. Accordingly, the surface Dirac cone of the Bi2Se3 film is evidently gapped for small thicknesses (two to four QLs), and the gap is reduced and, finally, is closed with the increasing thickness, agreeing well with the experiments. We further studied the substrate effect by investigating the Bi2Se3/graphene system. It is found that the underlying graphene induces a giant thickness-dependent Rashba splitting and Dirac point shift. Because Bi2Te3 films have smaller relative inter-QL expansion and stronger spin-orbit coupling, the topological features start to appear in the film as thin as two QLs in good accord with the experiments.

Liu, Wenliang [Xiangtan University, Xiangtan Hunan, China; Peng, Xiangyang [Xiangtan University, Xiangtan Hunan, China; Wei, Xiaolin [Xiangtan University, Xiangtan Hunan, China; Yang, Hong [Xiangtan University, Xiangtan Hunan, China; Stocks, George Malcolm [ORNL; Zhong, Jianxin [Xiangtan University, Xiangtan Hunan, China

2013-01-01T23:59:59.000Z

397

JOURNAL DE PHYSIQUE Colloque C4, supplkment au no 10, Tome 37, Octobre 1976, page C4-109 TRANSITION DE PHASE DANS LES COMPOSES CuS2 ET CuSe2  

E-Print Network [OSTI]

, analogues A celles observees dans les dichalcog6nures lamellaires C21 (NbSe2, TaSz, TaSez), a l'existence d

Boyer, Edmond

398

Optical phonons in CdGa{sub 2}S{sub 4x}Se{sub 4(1-x)} alloys  

SciTech Connect (OSTI)

The Raman spectra of CdGa{sub 2}S{sub 4x}Se{sub 4(1-x)} alloys (x = 0.1, 0.2, Horizontal-Ellipsis 0.9) are studied. Both the singlemode and double-mode behavior of optical phonons are observed in CdGa{sub 2}S{sub 4x}Se{sub 4(1-x)} alloys. The observed optical mode at 138 cm{sup -1} is independent of the composition. It seems likely that this mode is the 'breathing mode' and is caused by atomic motion in the anion sublattice relative to vacancies. It is shown that the high-frequency modes of symmetry B{sub 1}(LO, TO) and B{sub 2}(LO, TO) are caused by the in-phase motion of atoms in the anion sublattice along the tetragonal axis c relative to trivalent Ga atoms. The doubly degenerate symmetry modes E{sub 1}(LO, TO) and E{sub 2}(LO, TO) are caused by the in-phase motion of atoms in the anion sublattice relative to trivalent Ga atoms of the cation sublattice in the xy plane (dipole 2Ga-4C), where C is S, Se. The optical symmetry modes B{sub 3}(LO, TO) and B{sub 4}(LO, TO) are associated with the motion of atoms in the anion sublattice relative to Cd atoms along the tetragonal axis c. The doubly degenerate modes E{sub 3}(LO, TO) and E{sub 4}(LO, TO) are associated with the motion of atoms in the anion sublattice relative to Cd atoms (dipole Cd-4C). The low-frequency modes B{sub 5}(LO, TO) and E{sub 5}(LO, TO) are the analogs of acoustic phonons at the edge of the Brillouin zone of sphalerite.

Kerimova, T. G., E-mail: taira-kerimova@mail.ru; Abdullaev, N. A.; Mamedova, I. A.; Badalova, Z. I.; Guliev, R. A. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan); Paucar, R.; Wakita, K. [Chiba Institute of Technology (Japan); Mamedov, N. T. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2013-06-15T23:59:59.000Z

399

Nondestructive depth-resolved spectroscopic investigation of the heavily intermixed In2S3/Cu(In,Ga)Se2 interface  

SciTech Connect (OSTI)

The chemical structure of the interface between a nominal In2S3 buffer and a Cu(In,Ga)Se2 (CIGSe) thin-film solar cell absorber was investigated by soft x-ray photoelectron and emission spectroscopy. We find a heavily intermixed, complex interface structure, in which Cu diffuses into (and Na through) the buffer layer, while the CIGSe absorber surface/interface region is partially sulfurized. Based on our spectroscopic analysis, a comprehensive picture of the chemical interface structure is proposed.

Bar, Marcus; Barreau, N.; Couzinie-Devy, F.; Pookpanratana, S.; Klaer, J.; Blum, M.; Zhang, Y.; Yang, W.; Denlinger, J.D.; Schock, H.W.; Weinhardt, L.; Kessler, J.; Heske, Clemens

2010-04-06T23:59:59.000Z

400

Electronic Instability in a Zero-Gap Semiconductor: The Charge-Density Wave in (TaSe4)2I  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

We report a comprehensive study of the paradigmatic quasi-1D compound (TaSe4)2I performed by means of angle-resolved photoemission spectroscopy (ARPES) and first-principles electronic structure calculations. We find it to be a zero-gap semiconductor in the nondistorted structure, with non-negligible interchain coupling. Theory and experiment support a Peierls-like scenario for the charge-density wave formation below TCDW=263??K, where the incommensurability is a direct consequence of the finite interchain coupling. The formation of small polarons, strongly suggested by the ARPES data, explains the puzzling semiconductor-to-semiconductor transition observed in transport at TCDW.

Tournier-Colletta, C.; Moreschini, L.; Autès, G.; Moser, S.; Crepaldi, A.; Berger, H.; Walter, A. L.; Kim, K. S.; Bostwick, A.; Monceau, P.; Rotenberg, E.; Yazyev, O. V.; Grioni, M.

2013-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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401

Photoconductivity of structures based on the SnO{sub 2} porous matrix coupled with core-shell CdSe/CdS quantum dots  

SciTech Connect (OSTI)

Embedding of quantum dots into porous oxide matrixes is a perspective technique for photosensitization of a structure. We show that the sensitization efficiency may be increased by the use of core-shell quantum dots. It is demonstrated that the photoresponse amplitude in a SnO{sub 2} porous matrix with CdSe/CdS quantum dots depends non-monotonously on the number of atomic layers in a shell. The best results are obtained for SnO{sub 2} matrixes coupled with the quantum dots with three atomic layers of a shell. Mechanisms responsible for the structure sensitization are discussed.

Drozdov, K. A.; Kochnev, V. I.; Dobrovolsky, A. A.; Khokhlov, D. R. [Department of Physics, Moscow State University, 119991 Moscow (Russian Federation)] [Department of Physics, Moscow State University, 119991 Moscow (Russian Federation); Popelo, A. V. [Department of Materials Science, Moscow State University, 119991 Moscow (Russian Federation)] [Department of Materials Science, Moscow State University, 119991 Moscow (Russian Federation); Rumyantseva, M. N.; Gaskov, A. M.; Ryabova, L. I. [Department of Chemistry, Moscow State University, 119991 Moscow (Russian Federation)] [Department of Chemistry, Moscow State University, 119991 Moscow (Russian Federation); Vasiliev, R. B. [Department of Materials Science, Moscow State University, 119991 Moscow (Russian Federation) [Department of Materials Science, Moscow State University, 119991 Moscow (Russian Federation); Department of Chemistry, Moscow State University, 119991 Moscow (Russian Federation)

2013-09-23T23:59:59.000Z

402

Geochemistry of V and NI in bitumen and the depositional environment of the Meade Peak phosphatic shale member of the Phosphoria formation in SE Idaho  

SciTech Connect (OSTI)

Stratigraphic and geographic variation in V and Ni abundances and the (V/Ni + V) ration in bitumens from phosphorite and shale of the Meade Peak Member of SE Idaho reflect systematic vertical and lateral changes in environmental conditions during deposition of these rocks. These variations may have been preserved during generation, migration and accumulation of the Phosphoria oil. Thus, V/(Ni + V) ratios are useful geochemical parameters in reconstruction of the depositional environment, discrimination of genetic oil-types, and correlation of oil-source rock of the Phosphoria in the northern Rocky Mountains region.

Sharata, S.M. (Univ. of Idaho, Moscow (USA)); Filby, R.H. (Washington State Univ., Pullman (USA))

1989-03-01T23:59:59.000Z

403

Ballistic performance comparison of monolayer transition metal dichalcogenide MX{sub 2} (M = Mo, W; X = S, Se, Te) metal-oxide-semiconductor field effect transistors  

SciTech Connect (OSTI)

We study the transport properties of monolayer MX{sub 2} (M?=?Mo, W; X?=?S, Se, Te) n- and p-channel metal-oxide-semiconductor field effect transistors (MOSFETs) using full-band ballistic non-equilibrium Green's function simulations with an atomistic tight-binding Hamiltonian with hopping potentials obtained from density functional theory. We discuss the subthreshold slope, drain-induced barrier lowering (DIBL), as well as gate-induced drain leakage (GIDL) for different monolayer MX{sub 2} MOSFETs. We also report the possibility of negative differential resistance behavior in the output characteristics of nanoscale monolayer MX{sub 2} MOSFETs.

Chang, Jiwon; Register, Leonard F.; Banerjee, Sanjay K. [Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758 (United States)

2014-02-28T23:59:59.000Z

404

The crystallization kinetics of nanothin amorphous TlGa{sub 1-x}Ge{sub x}Se{sub 2} films  

SciTech Connect (OSTI)

The kinetics of phase transformations of amorphous Ge-doped TlGaSe{sub 2} films has been investigated by kinematic electron diffraction. It is shown that the crystallization of 30-nm-thick amorphous films obtained both in the absence of external effects and in an external electric field occurs according to the regularities established by Avrami and Kolmogorov and described by the analytical expression V{sub t} = V{sub 0}[1 - exp(-kt{sup m})]. The activation energies of nucleation and the further growth of nuclei have been determined from the kinetic curves of phase transformations.

Alekberov, E. Sh., E-mail: aeldar@hotbox.ru; Sharifova, A. K.; Ismayilov, D. I. [Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2009-05-15T23:59:59.000Z

405

Effect of temperature on electron spectra in the region of the intrinsic-absorption edge of CdGa{sub 2}Se{sub 4}  

SciTech Connect (OSTI)

The results of investigation of the temperature dependence of CdGa{sub 2}Se{sub 4} absorption coefficient in the polarized radiation at 5-300 K and that of the emission intensity at 4.2-77 K are presented. The changes observed for the polarization dependence of absorption coefficient and the radiation intensity with decreasing temperature are attributed to a different velocity of motion of states of the valence-band top {Gamma}{sub 3} + {Gamma}{sub 4} and {Gamma}{sub 2} with changing tetragonal compression.

Kerimova, T. G., E-mail: ktaira@physics.ab.az; Guliyev, R. A. [Academy of Sciences of Azerbajan, Institute of Physics (Azerbaijan)

2011-03-15T23:59:59.000Z

406

ar Career Se ummarizes th  

E-Print Network [OSTI]

nt prior to gra e), technology s $61,401, w nearly 68% a 9. We saw a hool, seeking graduate sc yne aduation. The y, consulting which was a s accepted posi 6% increase g graduate sc chool, 64.9% Associate to the Engineering section of the Career Services website for any student in the Class of 2010 who was browsing

Plotkin, Joshua B.

407

About-PHaSe-EFRC  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary)morphinanInformation InInformationCenterResearch Highlights MediaFuel Production

408

Publications-PHaSe-EFRC  

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

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409

Research-PHaSe-EFRC  

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

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410

Resources-PHaSe-EFRC  

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

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411

Solon SE | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia:FAQ < RAPID Jump to:Seadov Pty Ltd Jump to:InformationSolergy Power JumpIslands: Energy Resources Jump

412

News-PHaSe-EFRC  

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

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413

Impact of environmental conditions on the chemical surface properties of Cu(In,Ga)(S,Se){sub 2} thin-film solar cell absorbers  

SciTech Connect (OSTI)

Environmentally driven aging effects play a crucial role in thin-film solar cells based on Cu(In,Ga)(S,Se){sub 2}, both for long-term stability and short air exposure during production. For a better understanding of such effects, Cu(In,Ga)(S,Se){sub 2} absorber surfaces were investigated by x-ray photoelectron and Auger electron spectroscopy after exposure to different environmental conditions. Identical absorbers were stored in a nitrogen atmosphere, in damp heat, and under ambient conditions for up to 14 days. We find varying degrees of diffusion of sulfur, copper, and sodium towards the surface, with potential impact on the electronic surface structure (band gap) and the properties of the interface to a buffer layer in a solar cell device. Furthermore, we observe an oxidation (in decreasing order) of indium, copper, and selenium (but no oxidation of sulfur). And finally, varying amounts of carbon- and oxygen-containing adsorbates are found. In particular, the findings suggest that, for ambient air exposure, sodium carbonate is formed at the surface.

Hauschild, D., E-mail: dirk.hauschild@physik.uni-wuerzburg.de, E-mail: l.weinhardt@kit.edu; Meyer, F. [Experimental Physics VII, University of Würzburg, Am Hubland, 97074 Würzburg (Germany); Pohlner, S.; Lechner, R.; Dietmüller, R.; Palm, J. [AVANCIS GmbH and Co. KG, Otto-Hahn-Ring 6, 81739 Munich (Germany); Heske, C. [Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology (KIT), Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany); ANKA Synchrotron Radiation Facility, Karlsruhe Institute of Technology (KIT), Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany); Department of Chemistry, University of Nevada, Las Vegas (UNLV), 4505 Maryland Parkway, Las Vegas, Nevada 89154-4003 (United States); Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 18/20, 76128 Karlsruhe (Germany); Weinhardt, L., E-mail: dirk.hauschild@physik.uni-wuerzburg.de, E-mail: l.weinhardt@kit.edu [Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology (KIT), Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany); ANKA Synchrotron Radiation Facility, Karlsruhe Institute of Technology (KIT), Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany); Department of Chemistry, University of Nevada, Las Vegas (UNLV), 4505 Maryland Parkway, Las Vegas, Nevada 89154-4003 (United States); Reinert, F. [Experimental Physics VII, University of Würzburg, Am Hubland, 97074 Würzburg (Germany); Karlsruhe Institute of Technology (KIT), Gemeinschaftslabor für Nanoanalytik, 76021 Karlsruhe (Germany)

2014-05-14T23:59:59.000Z

414

Fabrication and testing of diamond-machined gratings in ZnSe, GaP, and bismuth germanate for the near infrared and visible  

SciTech Connect (OSTI)

High quality immersion gratings for infrared applications have been demonstrated in silicon and germanium. To extend this technology to shorter wavelengths other materials must be investigated. We selected three materials, zinc selenide, gallium phosphide and bismuth germanate (Bi{sub 4}Ge{sub 3}O{sub 12}), based on high refractive index, good visible transmission and commercial availability in useful sizes. Crystal samples were diamond turned on an ultra-precision lathe to identify preferred cutting directions. Using this information we diamond-flycut test gratings over a range of feed rates to determine the optimal cutting conditions. For both ZnSe and GaP good surface quality was achieved at feed rates up to 1.0 cm/minute using a special compound angle diamond tool with negative rake angles on both cutting surfaces. The surface roughness of the groove facets was about 4 nm. A Zygo interferometer measured grating wavefront errors in reflection. For the ZnSe the RMS error was < {lambda}/20 at 633nm. More extensive testing was performed with a HeNe laser source and a cooled CCD camera. These measurements demonstrated high relative diffraction efficiency (> 80%), low random groove error (2.0 nm rms), and Rowland ghost intensities at < 0.1%. Preliminary tests on bismuth germanate show high tool wear.

Kuzmenko, P J; Little, S L; Ikeda, Y; Kobayashi, N

2008-06-22T23:59:59.000Z

415

The synthesis and crystal structures of the first rare-earth alkaline-earth selenite chlorides MNd{sub 10}(SeO{sub 3}){sub 12}Cl{sub 8} (M=Ca and Sr)  

SciTech Connect (OSTI)

Two new alkaline-earth Nd selenite chlorides MNd{sub 10}(SeO{sub 3}){sub 12}Cl{sub 8} (M=Ca, Sr) were obtained using crystal growth from alkaline-earth chloride melts in quartz tubes. These new compounds crystallize in the orthorhombic system in space group C cca (no. 68). The compounds were studied by energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction. It was shown that both compounds adopt the same structure type, constructed by complex [M{sub 11}(SeO{sub 3}){sub 12}]{sup 8+} slabs separated by chloride anion layers perpendicular to the longest cell parameter. The SeO{sub 3} groups show a pyramidal shape and may be described as SeO{sub 3}E tetrahedra. Such SeO{sub 3} groups decorate the Nd-O skeletons forming the [M{sub 11}(SeO{sub 3}){sub 12}]{sup 8+} slabs. - Graphical abstract: Two new alkaline-earth Nd selenite chlorides MNd{sub 10}(SeO{sub 3}){sub 12}Cl{sub 8} (M=Ca, Sr) were synthesized. These structures are constructed by [M{sub 11}(SeO{sub 3}){sub 12}]{sup 8+} slabs separated by chloride anion layers.

Berdonosov, P.S. [Department of Chemistry, Moscow State University, Leninskie Gory, Moscow 119992 (Russian Federation)], E-mail: psberd@inorg.chem.msu.ru; Olenev, A.V.; Dolgikh, V.A. [Department of Chemistry, Moscow State University, Leninskie Gory, Moscow 119992 (Russian Federation); Lightfoot, P. [EaStChem, School of Chemistry, St. Andrews University, St. Andrews, KY16 9ST (United Kingdom)

2007-11-15T23:59:59.000Z

416

Il Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi" of-fre la possibilit a giovani ricercatori di svolgere la loro a vit in se ori  

E-Print Network [OSTI]

'uomo e all'energia. Nel se ore dell'energia il Centro Fermi ha dedicato uno dei propri proge strategici basano sul concentratore solare sviluppato u lizzando tecnologie mature derivan dal se ore automobili &ENERGIA Attività editoriale a cura de Il Sole 24 ORE Business Media LO SCENARIO / I risultati del rapporto

417

JOURNAL DE PHYSIQUE Colloque C3, suppl&ment au no 9, Tonze 36, Septembre 1975, page C3-101 THE p-CuInSe,/n-CdS HETERODIODE :PHOTOVOLTAIC  

E-Print Network [OSTI]

-CuInSe,/n-CdS HETERODIODE :PHOTOVOLTAIC DETECTOR, SOLAR CELL AND LIGHT EMITTING DIODE S. WAGNER, J. L. SHAY and H. M. KASPER prepared CuInSe2/CdS heterodiodes. These diodes are 70 quantum efficient photovoltaic detectors in the wavelength range from 550 to 1 250 nm. In a solar cell configuration a power conversion efficiencyof - 12

Boyer, Edmond

418

Midea: Proposed Penalty (2010-SE-0110, 2012-SE-1402, 2012-SE...  

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

Notice of Proposed Civil Penalty that Midea America Corp., Hefei Hualing Co., Ltd., and China Refrigeration Industry Co., Ltd. manufactured and distributed noncompliant...

419

Magnetic and structural transitions in the iron-chalcogenide high-Tc superconductor: K0.8Fe1.76Se2.00  

SciTech Connect (OSTI)

Fe-57 Mossbauer spectroscopy was used to study single-crystals of K0.8Fe1.76Se2.00 from 6K to 673 K. At 6K, the hyperfine field (B-hf) is canted away from the c-axis by 18 +/- 3 degrees. The temperature dependence of B-hf follows a spin wave model with a spin excitation gap of 9 +/- 1 meV. A sudden increase in the linewidth and a corresponding drop in (1/2)eQV(zz) at T-N - 532K are indications of strong coupling between the magnetic and structural transitions. (C) 2012 American Institute of Physics.

Rowan-Weetaluktuk, W.N.; Ryan, D.H.; Cadogan, J.M.; Hu, R.; Budko, S.L.; Canfield, P.C.

2012-02-29T23:59:59.000Z

420

Anomalous reduction of the switching voltage of Bi-doped Ge{sub 0.5}Se{sub 0.5} ovonic threshold switching devices  

SciTech Connect (OSTI)

Switching devices based on Ovonic Threshold Switching (OTS) have been considered as a solution to overcoming limitations of Si-based electronic devices, but the reduction of switching voltage is a major challenge. Here, we investigated the effect of Bi-doping in Ge{sub 0.5}Se{sub 0.5} thin films on their thermal, optical, electrical properties, as well as on the characteristics of OTS devices. As Bi increased, it was found that both of the optical energy gap (E{sub g}{sup opt}) and the depth of trap states decreased resulting in a drastic reduction of the threshold voltage (V{sub th}) by over 50%. In addition, E{sub g}{sup opt} was found to be about three times of the conduction activation energy for each composition. These results are explained in terms of the Mott delocalization effect by doping Bi.

Seo, Juhee [Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791 (Korea, Republic of); Department of Nanomaterials Science and Engineering, University of Science and Technology, Daejeon 305-350 (Korea, Republic of); Ahn, Hyung-Woo [Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791 (Korea, Republic of); Department of Material Science and Engineering, Korea University, Seoul 136-701 (Korea, Republic of); Shin, Sang-yeol [Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791 (Korea, Republic of); Department of Materials Science and Engineering, Korea Aerospace University, Goyang 412-791 (Korea, Republic of); Cheong, Byung-ki; Lee, Suyoun, E-mail: slee-eels@kist.re.kr [Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791 (Korea, Republic of)

2014-04-14T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


421

Synthesis of CdS/CdSe core/shell ultra small nanostructures using new microwave assisted ultrasonic sol gel route  

SciTech Connect (OSTI)

Core-shell CdS/CdSe nanostructures have been synthesized by new microwave assisted ultrasonic sol gel route. The solution was obtained by dissolving cadmium acetate and Thiourea in the molar ratio 1:1 in Triethlioamine. The solution was Ultrasonically irradiated by Ultrasonic crystal at 40 Hz for 3 hours at 70°C. The sol was kept for another 24 hours for gel formation. Selenium dioxide was used as a selenium source and added separately. The gel was spin coated on Quartz and Glass slides followed by microwave heat treatment. The samples were characterized by structural morphological and optical characterization. XRD studies confirm the zinc blende phase of the CdS nanoparticles. The mean nanocrystal sizes calculated using Scherrer equation is ?1.2nm. Optical studies show the strong blue shift in the spectra due to very small size of the nanocrystals. TEM and HRTEM confirm the formation of core shell structures.

Goswami, Y. C., E-mail: y-goswami@yahoo.com; Kumar, Vijay, E-mail: y-goswami@yahoo.com [School of Physical Sciences, ITM University, Sithouli, Gwalior- 474001 (India); Sharma, Ranjana [Institute of Technology and Management, Sithouli, Gwalior- 474001 (India); Singh, Rajeev [Institute of Information Technology and Management, Sithouli, Gwalior, MP 474001 (India)

2014-04-24T23:59:59.000Z

422

Effect of carrier recombination on ultrafast carrier dynamics in thin films of the topological insulator Bi{sub 2}Se{sub 3}  

SciTech Connect (OSTI)

Transient reflectivity (TR) from thin films (6–40?nm thick) of the topological insulator Bi{sub 2}Se{sub 3} revealed ultrafast carrier dynamics, which suggest the existence of both radiative and non-radiative recombination between electrons residing in the upper cone of initially unoccupied high energy Dirac surface states (SS) and holes residing in the lower cone of occupied low energy Dirac SS. The modeling of measured TR traces allowed us to conclude that recombination is induced by the depletion of bulk electrons in films below ?20?nm thick due to the charge captured on the surface defects. We predict that such recombination processes can be observed using time-resolved photoluminescence techniques.

Glinka, Yuri D., E-mail: ydglinka@mail.wvu.edu [Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506-6315 (United States); Institute of Physics, National Academy of Sciences of Ukraine, Kiev 03028 (Ukraine); Babakiray, Sercan; Johnson, Trent A.; Holcomb, Mikel B.; Lederman, David [Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506-6315 (United States)

2014-10-27T23:59:59.000Z

423

Research on high efficiency, large-area CuInSe{sub 2}-based thin-film modules. Annual subcontract report, 1 May 1991--30 April 1992  

SciTech Connect (OSTI)

Objective was to demonstrate 12.5% aperture efficient, large area (3900 cm{sup 2}) encapsulated thin thin CuInSe{sub 2} (CIS) modules. The module design consists of 53 series-connected ZnO/CdS/CIS/Mo/glass cells fabricated on a glass substrate. A baseline characterization of the CIS modules was established during Phase 1. Maps of open circuit voltage provide information on junction quality uniformity. Maps of cell voltages at fixed forward bias show variations in resistance losses due to interconnects. Individual cell I-V curves can be evaluated. Physical nature of defects is correlated using OBIC, EBIC, SEM, tape adhesion, etc. A new world record of 37.7 W and 9.7% aperture efficiency was attained for an encapsulated module; an unencapsulated CIS module plate achieved 40.8 W and 10.5% aperture efficiency.

Mitchell, K.W.; Eberspacher, C. [Siemens Solar Industries, Camarillo, CA (United States)

1993-02-01T23:59:59.000Z

424

Space-charge-limited currents in an Se{sub 95}As{sub 5} chalcogenide glass-like semiconductor system containing EuF{sub 3} impurities  

SciTech Connect (OSTI)

It is established that charge carrier (hole) transport in the Al-Se{sub 95}As{sub 5} Left-Pointing-Angle-Bracket EuF{sub 3} Right-Pointing-Angle-Bracket -Te structure is effected by unipolar injection currents limited by space charges with the involvement of two capture trap groups. Shallow traps corresponding to charged intrinsic defects C{sub 1}{sup -} are related to broken selenium bonds. Deep traps corresponding to charged intrinsic defects P{sub 2}{sup -} are formed by arsenic atoms with broken coordination. It is shown that the EuF{sub 3} impurity strongly affects the concentration of the capture traps, especially those localized near the Fermi level.

Isayev, A. I.; Mekhtiyeva, S. I.; Qaribova, S. N., E-mail: sqaribova@rambler.ru [Azerbaijan National Academy of Sciences, Abdullaev Institute of Physics (Azerbaijan)

2011-12-15T23:59:59.000Z

425

X-ray diffraction study, magnetic susceptibility, and electric properties of Cu{sub 3}Fe{sub 0.5}Se{sub 2} crystal  

SciTech Connect (OSTI)

Single crystals of the Cu{sub 3}Fe{sub 0.5}Se{sub 2} composition have been grown. The orthorhombic lattice parameters are found to be a = 8.169 A, b = 8.238 A, c = 12.052 A, V = 811.15 A{sup 3}, D{sub x} = 6.23 g/cm{sup 3}, sp. gr. Pnma, Z = 8. The magnetic susceptibility is measured in the range 100 < T < 400 K at H = 2 T. It is established that a crystal transforms into the antiferromagnetic state below T{sub N} = 350 K. The temperature dependences of the electrical conduction ({sigma}), thermal electromotive force ({alpha}), and thermal conduction (k) are measured in the range 80 < T < 400 K; the n value was calculated to be 5 x 10{sup 19} cm{sup -1}.

Guseinov, G. G., E-mail: g.guseinov@rambler.ru; Ragimov, S. S.; Hasani Barbaran, J.; Agamirzoeva, G. M. [National Academy of Sciences, Institute of Physics (Azerbaijan)

2010-07-15T23:59:59.000Z

426

Research on polycrystalline thin-film CuGaInSe{sub 2} solar cells. Annual subcontract report, 3 May 1991--2 May 1992  

SciTech Connect (OSTI)

This report describes research to fabricate high-efficiency CdZnS/CuInGaSe{sub 2} (CIGS) thin-film solar cells, and to develop improved transparent conductor window layers such as ZnO. A specific technical milestone was the demonstration of an air mass (AM) 1.5 global, 13% efficient, 1-cm{sup 2}-total-area CIGS thin-film solar cell. Our activities focused on three areas. First, a CIGS deposition: system was modified to double its substrate capacity, thus increasing throughput, which is critical to speeding the process development by providing multiple substrates from the same CIGS run. Second, new tooling was developed to enable an investigation of a modified aqueous CdZnS process. The goal was to improve the yield of this critical step in the device fabrication process. Third, our ZnO sputtering system was upgraded to improve its reliability, and the sputtering parameters were further optimized to improve its properties as a transparent conducting oxide. The characterization of the new CIGS deposition system substrate fixturing was completed, and we produced good thermal uniformity and adequately high temperatures for device-quality CIGS deposition. Both the CIGS and ZnO deposition processes were refined to yield a ZnO//Cd{sub 0.82}Zn{sub 0.18}S/CuIn{sub 0.80}Ga{sub 0.20}Se{sub 2} cell that was verified at NREL under standard testing conditions at 13.1% efficiency with V{sub oc} = 0.581 V, J{sub sc} = 34.8 mA/cm{sup 2}, FF = 0.728, and a cell area of 0.979 cm{sup 2}.

Stanbery, B.J.; Chen, W.S.; Devaney, W.E.; Stewart, J.W. [Boeing Co., Seattle, WA (United States). Defense and Space Systems Group

1992-11-01T23:59:59.000Z

427

Compared Raman study of the phase transitions in K2ZnCl4 and Rb2ZnCl4, Rb2ZnBr4, K2SeO4  

E-Print Network [OSTI]

787 Compared Raman study of the phase transitions in K2ZnCl4 and Rb2ZnCl4, Rb2ZnBr4, K2SeO4 M to the incommensurate phase is discussed for the four compounds K2SeO4, K2ZnCl4, Rb2ZnCl4 and Rb2ZnBr4 on the basis measurements on K2ZnC'4 known to exhibit successive phase transitions similar to those of K2SeO4

Paris-Sud XI, Université de

428

IV Festival Controamericano de Teatro: El Salvador 96  

E-Print Network [OSTI]

FALL 1997 151 IV Festival Centroamericano de Teatro: El Salvador 96 Beatriz J. Rizk En la ciudad de San Salvador, la llamada apropiadamente Valle de las Hamacas por sus temblores de tierra que parecen formar parte de las actividades cotidianas... Honduras, Costa Rica, El Salvador y Guatemala, además de contar con la participación de Cuba, Argentina, Estados Unidos y México. Para la ocasión se utilizaron tres espacios de manera simultánea: la Gran Sala y la Pequeña Sala del fastuoso Teatro...

Rizk, Beatriz J.

1997-10-01T23:59:59.000Z

429

Structural properties of Bi{sub 2}Te{sub 3} and Bi{sub 2}Se{sub 3} topological insulators grown by molecular beam epitaxy on GaAs(001) substrates  

SciTech Connect (OSTI)

Thin films of Bi{sub 2}Te{sub 3} and Bi{sub 2}Se{sub 3} have been grown on deoxidized GaAs(001) substrates using molecular beam epitaxy. Cross-sectional transmission electron microscopy established the highly parallel nature of the Te(Se)-Bi-Te(Se)-Bi-Te(Se) quintuple layers deposited on the slightly wavy GaAs substrate surface and the different crystal symmetries of the two materials. Raman mapping confirmed the presence of the strong characteristic peaks reported previously for these materials in bulk form. The overall quality of these films reveals the potential of combining topological insulators with ferromagnetic semiconductors for future applications.

Liu, X.; Leiner, J.; Dobrowolska, M.; Furdyna, J. K. [Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States); Smith, D. J. [Department of Physics, Arizona State University, Tempe, Arizona 85287 (United States); Fan, J. [Department of Physics, Arizona State University, Tempe, Arizona 85287 (United States); Center for Photonics Innovation, Arizona State University, Tempe, Arizona 85287 (United States); Zhang, Y.-H. [Center for Photonics Innovation, Arizona State University, Tempe, Arizona 85287 (United States); School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287 (United States); Cao, H.; Chen, Y. P. [Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States); Kirby, B. J. [Center for Neutron Research, NIST, Gaithersburg, Maryland 20899 (United States)

2011-10-24T23:59:59.000Z

430

Hoje no faltam rankingspara avaliar as universidades. J ningum se pode queixar de dar tiros no escuro quando escolhe a escola onde quer fazer a licenciatura ou o mestrado.  

E-Print Network [OSTI]

Hoje não faltam rankingspara avaliar as universidades. Já ninguém se pode queixar de dar tiros atenção quando quiser fazer o mestrado. Nessa altura deve começar a dar atenção aos rankings para saber

Instituto de Sistemas e Robotica

431

Johnson, G.C., and S.E. Wijffels. 2011. Ocean density change contributions to sea level rise. Oceanography 24(2):112121, doi:10.5670/oceanog.2011.31.  

E-Print Network [OSTI]

CITATION Johnson, G.C., and S.E. Wijffels. 2011. Ocean density change contributions to sea level al., 2010; Purkey and Johnson, 2010). This is about 25 times humankind's rate of energy consumption

Johnson, Gregory C.

432

Thermoelectric properties of n-type Bi{sub 2}(Te{sub 1{minus}x}Se{sub x}){sub 3} fabricated by mechanical alloying and hot pressing  

SciTech Connect (OSTI)

Thermoelectric properties of polycrystalline Bi{sub 2}(Te{sub 1{minus}x}Se{sub x}){sub 3} (0.05 {le} x {le} 0.25), fabricated by mechanical alloying and hot pressing, have been investigated. Formation of n-type Bi{sub 2}(Te{sub 0.9}Se{sub 0.1}){sub 3} alloy powders was completed by mechanical alloying for 3 hours at ball-to-material ratio of 5:1, and processing time for Bi{sub 2}(Te{sub 1{minus}x}Se{sub x}){sub 3} formation increased with Bi{sub 2}Se{sub 3} content x. Figure-of-merit of Bi{sub 2}(Te{sub 0.9}Se{sub 0.1}) was markedly increased by hot pressing at temperatures above 450 C, and maximum value of 1.9 x 10{sup {minus}3}/K was obtained by hot pressing at 550 C. With addition of 0.015 wt% Bi as acceptor dopant, figure-of-merit of Bi{sub 2}(Te{sub 0.9}Se{sub 0.1}){sub 3} was hot pressed at 550 C, could be improved to 2.1 x 10{sup {minus}3}/K. When Bi{sub 2}(Te{sub 1{minus}x}Se{sub x}){sub 3} was hot pressed at 550 C, figure-of-merit increased from 1.14 x 10{sup {minus}3}/K to 1.92 x 10{sup {minus}3}/K with increasing Bi{sub 2}Se{sub 3} content x from 0.05 to 0.15, and then decreased to 1.30 x 10{sup {minus}3}/K for x = 0.25 composition.

Kim, H.J.; Choi, J.S.; Oh, T.S.; Hyun, D.B.

1997-07-01T23:59:59.000Z

433

Race and Ethnicity and Latin America's United Nations Millennium Development Goals  

E-Print Network [OSTI]

but very unlikely for Bolivia, Colombia, Paraguay andreduction in Mexico, Bolivia and Guatemala were slower thanin Mexico, Guatemala, Bolivia while blacks and mulattos are

Telles, Edward E.

2007-01-01T23:59:59.000Z

434

High temperature redox reactions with uranium: Synthesis and characterization of Cs(UO{sub 2})Cl(SeO{sub 3}), Rb{sub 2}(UO{sub 2}){sub 3}O{sub 2}(SeO{sub 3}){sub 2}, and RbNa{sub 5}U{sub 2}(SO{sub 4}){sub 7}  

SciTech Connect (OSTI)

Cs(UO{sub 2})Cl(SeO{sub 3}) (1), Rb{sub 2}(UO{sub 2}){sub 3}O{sub 2}(SeO{sub 3}){sub 3} (2), and RbNa{sub 5}U{sub 2}(SO{sub 4}){sub 7} (3) single crystals were synthesized using CsCl, RbCl, and a CuCl/NaCl eutectic mixture as fluxes, respectively. Their lattice parameters and space groups are as follows: P2{sub 1}/n (a=6.548(1) Å, b=11.052(2) Å, c=10.666(2) Å and ?=93.897(3)°), P1{sup ¯} (a=7.051(2) Å, b=7.198(2) Å, c=8.314(2) Å, ?=107.897(3)°, ?=102.687(3)° and ?=100.564(3)°) and C2/c (a=17.862(4) Å, b=6.931(1) Å, c=20.133(4) Å and ?=109.737(6)°. The small anionic building units found in these compounds are SeO{sub 3}{sup 2?} and SO{sub 4}{sup 2?} tetrahedra, oxide, and chloride. The crystal structure of the first compound is composed of [(UO{sub 2}){sub 2}Cl{sub 2}(SeO{sub 3}){sub 2}]{sup 2?} chains separated by Cs{sup +} cations. The structure of (2) is constructed from [(UO{sub 2}){sub 3}O{sub 11}]{sup 16?} chains further connected through selenite units into layers stacked perpendicularly to the [0 1 0] direction, with Rb{sup +} cations intercalating between them. The structure of compound (3) is made of uranyl sulfate layers formed by edge and vertex connections between dimeric [U{sub 2}O{sub 16}] and [SO{sub 4}] polyhedra. These layers contain unusual sulfate–metal connectivity as well as large voids. - Graphical abstract: A new family of uranyl selenites and sulfates has been prepared by high-temperature redox reactions. This compounds display new bonding motifs. Display Omitted - Highlights: • Low-dimensional Uranyl Oxoanion compounds. • Conversion of U(IV) to U(VI) at high temperatures. • Dimensional reduction by both halides and stereochemically active lone-pairs.

Babo, Jean-Marie [Department of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way, Tallahassee, FL 32306-4390 (United States); Department of Civil and Environmental Engineering and Earth Sciences and Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556 (United States); Albrecht-Schmitt, Thomas E., E-mail: talbrechtschmitt@gmail.com [Department of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way, Tallahassee, FL 32306-4390 (United States)

2013-10-15T23:59:59.000Z

435

Determining conductivity and mobility values of individual components in multiphase composite Cu{sub 1.97}Ag{sub 0.03}Se  

SciTech Connect (OSTI)

The intense interest in phase segregation in thermoelectrics as a means to reduce the lattice thermal conductivity and to modify the electronic properties from nanoscale size effects has not been met with a method for separately measuring the properties of each phase assuming a classical mixture. Here, we apply effective medium theory for measurements of the in-line and Hall resistivity of a multiphase composite, in this case Cu{sub 1.97}Ag{sub 0.03}Se. The behavior of these properties with magnetic field as analyzed by effective medium theory allows us to separate the conductivity and charge carrier mobility of each phase. This powerful technique can be used to determine the matrix properties in the presence of an unwanted impurity phase, to control each phase in an engineered composite, and to determine the maximum carrier concentration change by a given dopant, making it the first step toward a full optimization of a multiphase thermoelectric material and distinguishing nanoscale effects from those of a classical mixture.

Day, Tristan W.; Brown, David R.; Snyder, G. Jeffrey, E-mail: jsnyder@caltech.edu [Department of Materials Science, California Institute of Technology, MC 309-81, Pasadena, California 91106 (United States); Zeier, Wolfgang G. [Department of Materials Science, California Institute of Technology, MC 309-81, Pasadena, California 91106 (United States); Department of Chemistry, University of Southern California, Seeley G. Mudd Bldg., 3620 McClintock Ave., Los Angeles, California 90089-1062 (United States); Melot, Brent C. [Department of Chemistry, University of Southern California, Seeley G. Mudd Bldg., 3620 McClintock Ave., Los Angeles, California 90089-1062 (United States)

2014-10-27T23:59:59.000Z

436

Investigation of deep-level defects in Cu(In,Ga)Se{sub 2} thin films by a steady-state photocapacitance method  

SciTech Connect (OSTI)

The properties of defect levels located 0.8?eV above the valence band in Cu(In{sub 1?x},Ga{sub x})Se{sub 2} thin films were investigated by a steady-state photocapacitance method. When illuminated by light with a photon energy of 0.8?eV at 60?K, a fast increase, followed by a slow increase, was observed in the photocapacitance transients of all samples. Upon being re-exposed, samples with a low bandgap energy showed a slow decrease in photocapacitance transients. These observations were interpreted using a configuration coordinate model assuming two states for the 0.8?eV defect: a stable state D and its metastable state D* with a large lattice relaxation. The difference in the evolution mechanisms of the photocapacitance transients was attributed to the difference in the optical transition of carriers between the two states of the 0.8?eV defect and the valence and conduction bands.

Hu, Xiaobo, E-mail: hxb1314@gmail.com; Sakurai, Takeaki; Akimoto, Katsuhiro [Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan); Yamada, Akimasa; Ishizuka, Shogo; Niki, Sigeru [National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568 (Japan)

2014-10-28T23:59:59.000Z

437

The superionic phase transitions in (NH{sub 4}){sub 3}H(SeO{sub 4}){sub 2} under hydrostatic pressure up to 400?MPa  

SciTech Connect (OSTI)

The effect of hydrostatic pressure on proton conductivity of (NH{sub 4}){sub 3}H(SeO{sub 4}){sub 2} superionic crystal was studied in a wide temperature range and different isobaric conditions by means of impedance spectroscopy method. The measurements were performed along the trigonal c axis of the crystal, i.e., along the direction perpendicular to the plane in which, in the superionic phases, a dynamically disordered H-bond network is formed. The obtained pressure-temperature phase diagram is linear with increasing pressure. The triple point, which is the point of coexistence of the three phases: ferroelastic phase IV, ferroelastic phase III, and superionic phase II was found at p?=?116.3?MPa and T?=?287.3?K. High pressure leads to increase in the temperature range of stability of both superionic phases and to a drastic decrease in the temperature width of the ferroelastic phase III. With increasing pressure, the range of the superionic phase II expands at the expense of the range of the ferroelastic phase III, which is unstable and vanishes at the triple point.

Lindner, ?.; Zdanowska-Fr?czek, M., E-mail: mzf@ifmpan.poznan.pl; Paw?owski, A.; Fr?czek, Z. J. [Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, Pozna? 60-179 (Poland)

2014-10-28T23:59:59.000Z

438

Mechanical and thermal properties of h-MX{sub 2} (M?=?Cr, Mo, W; X?=?O, S, Se, Te) monolayers: A comparative study  

SciTech Connect (OSTI)

Using density functional theory, we obtain the mechanical and thermal properties of MX{sub 2} monolayers (where M?=?Cr, Mo, W and X?=?O, S, Se, Te). The ?-centered phonon frequencies (i.e., A{sub 1}, A{sub 2}{sup ?}, E?, and E?), relative frequency values of A{sub 1}, and E? modes, and mechanical properties (i.e., elastic constants, Young modulus, and Poisson's ratio) display a strong dependence on the type of metal and chalcogenide atoms. In each chalcogenide (metal) group, transition-metal dichalcogenides (TMDCs) with W (O) atom are found to be much stiffer. Consistent with their stability, the thermal expansion of lattice constants for TMDCs with O (Te) is much slower (faster). Furthermore, in a heterostructure of these materials, the difference of the thermal expansion of lattice constants between the individual components becomes quite tiny over the whole temperature range. The calculated mechanical and thermal properties show that TMDCs are promising materials for heterostructures.

Çak?r, Deniz, E-mail: deniz.cakir@uantwerpen.be; Peeters, François M., E-mail: francois.peeters@uantwerpen.be [Department of Physics, University of Antwerp, 2610 Antwerpen (Belgium); Sevik, Cem, E-mail: csevik@anadolu.edu.tr [Department of Mechanical Engineering, Faculty of Engineering, Anadolu University, Eskisehir TR 26555 (Turkey)

2014-05-19T23:59:59.000Z

439

Cu(In,Ga)Se{sub 2} absorber thinning and the homo-interface model: Influence of Mo back contact and 3-stage process on device characteristics  

SciTech Connect (OSTI)

Thinning the absorber layer is one of the possibilities envisaged to further decrease the production costs of Cu(In,Ga)Se{sub 2} (CIGSe) thin films solar cell technology. In the present study, the electronic transport in submicron CIGSe-based devices has been investigated and compared to that of standard devices. It is observed that when the absorber is around 0.5??m-thick, tunnelling enhanced interface recombination dominates, which harms cells energy conversion efficiency. It is also shown that by varying either the properties of the Mo back contact or the characteristics of 3-stage growth processing, one can shift the dominating recombination mechanism from interface to space charge region and thereby improve the cells efficiency. Discussions on these experimental facts led to the conclusions that 3-stage process implies the formation of a CIGSe/CIGSe homo-interface, whose location as well as properties rule the device operation; its influence is enhanced in submicron CIGSe based solar cells.

Leonard, E.; Arzel, L.; Tomassini, M.; Barreau, N., E-mail: nicolas.barreau@univ-nantes.fr [Institut des Matériaux Jean Rouxel (IMN)-UMR 6502, Université de Nantes, CNRS, 2 rue de la Houssinière, BP 32229, 44322 Nantes Cedex 3 (France); Zabierowski, P. [Faculty of Physics, Warsaw University of Technology, Koszykowa 75, PL 00-662 Warsaw (Poland); Fuertes Marrón, D. [Instituto de Energía Solar–ETSIT, Technical University of Madrid, Ciudad Universitaria s.n., 28040 Madrid (Spain)

2014-08-21T23:59:59.000Z

440

Thickness Effect of Al-Doped ZnO Window Layer on Damp Heat Stability of CuInGaSe2 Solar Cells: Preprint  

SciTech Connect (OSTI)

We investigated the damp heat (DH) stability of CuInGaSe2 (CIGS) solar cells as a function of thickness of the Al-doped ZnO (AZO) window layer from the 'standard' 0.12 ?m to a modest 0.50 ?m over an underlying 0.10-?m intrinsic ZnO buffer layer. The CIGS cells were prepared with external electrical contact using fine Au wire to the tiny 'standard' Ni/Al (0.05 ?m/3 ?m) metal grid contact pads. Bare cell coupons and sample sets encapsulated in a specially designed, Al-frame test structure with an opening for moisture ingress control using a TPT backsheet were exposed to DH at 85oC and 85% relative humidity, and characterized by current-voltage (I-V), quantum efficiency (QE), and (electrochemical) impedance spectroscopy (ECIS). The results show that bare cells exhibited rapid degradation within 50-100 h, accompanied by film wrinkling and delamination and corrosion of Mo and AlNi grid, regardless of AZO thickness. In contrast, the encapsulated cells did not show film wrinkling, delamination, and Mo corrosion after 168 h DH exposure; but the trend of efficiency degradation rate showed a weak correlation to the AZO thickness.

Pern, F. J.; Mansfield, L.; DeHart, C.; Glick, S. H.; Yan, F.; Noufi, R.

2011-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "guatemala se mencionan" 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

Influence of Damp Heat on the Electrical, Optical, and Morphological Properties of Encapsulated CuInGaSe2 Devices: Preprint  

SciTech Connect (OSTI)

CuInGaSe2 (CIGS) devices, encapsulated with different backsheets having different water vapor transmission rates (WVTR), were exposed to damp heat (DH) at 85C and 85% relative humidity (RH) and characterized periodically to understand junction degradation induced by moisture ingress. Performance degradation of the devices was primarily driven by an increase in series resistance within first 50 h of exposure, resulting in a decrease in fill factor and, accompanied loss in carrier concentration and widening of depletion width. Surface analysis of the devices after 700-h DH exposure showed the formation of Zn(OH)2 from hydrolysis of the Al-doped ZnO (AZO) window layer by the moisture, which was detrimental to the collection of minority carriers. Minority carrier lifetimes observed for the CIGS devices using time resolved photoluminescence (TRPL) remained relatively long after DH exposure. By etching the DH-exposed devices and re-fabricating with new component layers, the performance of reworked devices improved significantly, further indicating that DH-induced degradation of the AZO layer and/or the CdS buffer was the primary performance-degrading factor.

Sundaramoorthy, R.; Pern, F. J.; Teeter, G.; Li, J. V.; Young, M.; Kuciauskas, D.; Call, N.; Yan, F.; To, B.; Johnston, S.; Noufi, R.; Gessert, T. A.

2011-08-01T23:59:59.000Z

442

'Giant' multishell CdSe nanocrystal quantum dots with supporessed blinking: novel fluorescent probes for real-time detection of single-molecule events  

SciTech Connect (OSTI)

We reported for the first time that key nanocrystal quantum dot (NQD) optical properties-quantum yield, photobleaching and blinking-can be rendered independent ofNQD surface chemistry and environment by growth of a very thick, defect-free inorganic shell. Here, we show the precise shell-thickness dependence of these effects. We demonstrate that 'giant-shell' NQDs can be largely non-blinking for observation times as long as 54 minutes and lhat on-time fractions are independent of experimental time-resolution from 1-200 ms. These effects are primarily demonstrated on (CdSe)CdS (core)shell NQDs, but we also show that alloyed shells comprising Cd.Znl.'S and terminated with a non-cytotoxic ZnS layer exhibit similar properties. The mechanism for suppressed blinking and dramatically enhanced stability is attributed to both effective isolation of the NQD core excitonic wavefunction from the NQD surface, as well as a quasi-Type II electronic structure. The unusual electronic structure provides for effective spatial separation of the electron and hole into the shell and core, respectively, and, thereby, for reduced efficiencies in non-radiative Auger recombination.

Hollingsworth, Jennifer A [Los Alamos National Laboratory; Vela, Javier [Los Alamos National Laboratory; Htoon, Han [Los Alamos National Laboratory; Klimov, Victor I [Los Alamos National Laboratory; Casson, Amy R [Los Alamos National Laboratory; Chen, Yongfen [NON LANL

2009-01-01T23:59:59.000Z

443

Density functional theory investigation of the electronic structure and thermoelectric properties of layered MoS{sub 2}, MoSe{sub 2} and their mixed-layer compound  

SciTech Connect (OSTI)

First principles density functional theory calculations were carried out for the 2H-MoQ{sub 2} (Q=S and Se) and their hypothetical mixed-layer compound. Due to the different electronegativities of S and Se atoms on MoQ{sub 2}, the band gap size could be adjusted in mixed-layer compound MoS{sub 2}/MoSe{sub 2}. Also, the indirect band gap in pure MoQ{sub 2} compounds is changed to the pseudo direct band gap in mixed-layer MoS{sub 2}/MoSe{sub 2} which is similar to the monolayer compound. The layer mixing enhances the thermoelectric properties because of the increased density of states around the Fermi level and the decreased band gap size. Therefore, we suggest that this layer mixing approach should be regarded as a useful way to modulate their electronic structures and to improve their thermoelectric properties. -- Graphical abstract: On the basis of density functional calculations we predict that the mixed-layer compounds 2H-MoS{sub 2}/2H-MoSe{sub 2}, in which two different layers 2H-MoS{sub 2} and 2H-MoSe{sub 2}, have enhanced thermoelectric properties because of the increased density of states around the Fermi level and the decreased band gap size. Highlights: • We explored a way of improving TE properties of 2H-MoQ{sub 2} on DFT methods. • The mixed-layer compounds MoS{sub 2}/MoSe{sub 2} have enhanced thermoelectric properties. • This is caused by modulated electronic structure of mixed layer compound. • Layer mixing approach should be regarded as a useful way to improve TE properties.

Lee, Changhoon; Hong, Jisook [Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784 (Korea, Republic of); Lee, Wang Ro [Faculty of Liberal Education, Chonbuk National University, Jeonju, Jeonbuk 561-756 (Korea, Republic of); Kim, Dae Yeon [Agency for Defense Development (ADD), Chinhae, Kyungnam 645-600 (Korea, Republic of); Shim, Ji Hoon, E-mail: jhshim@postech.ac.kr [Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784 (Korea, Republic of); Divisions of Advanced Nuclear Engineering, Pohang University of Science and Technology, Pohang 790-784 (Korea, Republic of)

2014-03-15T23:59:59.000Z

444

Hg and Se capture and fly ash carbons from combustion of complex pulverized feed blends mainly of anthracitic coal rank in Spanish power plants  

SciTech Connect (OSTI)

In this work, the petrology and chemistry of fly ashes produced in a Spanish power plant from the combustion of complex pulverized feed blends made up of anthracitic/meta-anthracitic coals, petroleum, and natural coke are investigated. It was found that the behavior of fly ash carbons derived from anthracitic coals follows relatively similar patterns to those established for the carbons from the combustion of bituminous coals. Fly ashes were sampled in eight hoppers from two electrostatic precipitator (ESP) rows. The characterization of the raw ashes and their five sieved fractions (from {gt}150 to {lt}25 {mu}m) showed that glassy material, quartz, oxides, and spinels in different proportions are the main inorganic components. As for the organic fraction, the dominant fly ash carbons are anisotropic carbons, mainly unburned carbons derived from anthracitic vitrinite. The concentration of Se and Hg increased in ashes of the second ESP row, this increase being related to the higher proportion of anisotropic unburned carbons, particularly those largely derived from anthracitic vitrinite in the cooler ashes of the ESP (second row) and also related to the decrease in the flue gas temperature. This suggests that the flue gas temperature plays a major role in the concentration of mercury for similar ratios of unburned carbons. It was also found that Hg is highly concentrated in the medium-coarser fractions of the fly ashes ({gt} 45 {mu}m), there being a positive relationship between the amount of these carbons, which are apparently little modified during the combustion process, in the medium-coarse fractions of the ashes and the Hg retention. According to the results obtained, further research on this type of fly ash could be highly productive. 28 refs., 10 figs., 8 tabs.

I. Surez-Ruiz; J.C. Hower; G.A. Thomas [Instituto Nacional del Carbon (INCAR-CSIC), Oviedo (Spain)

2007-01-15T23:59:59.000Z

445

Crystal structure and magnetic properties of two new cobalt selenite halides: Co{sub 5}(SeO{sub 3}){sub 4} X {sub 2} (X=Cl, Br)  

SciTech Connect (OSTI)

Two new isostructural cobalt selenite halides Co{sub 5}(SeO{sub 3}){sub 4}Cl{sub 2} and Co{sub 5}(SeO{sub 3}){sub 4}Br{sub 2} have been synthesized. They crystallize in the triclinic system space group P-1 with the following lattice parameters for Co{sub 5}(SeO{sub 3}){sub 4}Cl{sub 2}: a=6.4935(8) A, b=7.7288(8) A, c=7.7443(10) A, {alpha}=66.051(11){sup o}, {beta}=73.610(11){sup o}, {gamma}=81.268(9){sup o}, and Z=1. The crystal structures were solved from single-crystal X-ray data, R1=3.73 and 4.03 for Co{sub 5}(SeO{sub 3}){sub 4}Cl{sub 2} and Co{sub 5}(SeO{sub 3}){sub 4}Br{sub 2}, respectively. The new compounds are isostructural to Ni{sub 5}(SeO{sub 3}){sub 4}Br{sub 2}. Magnetic susceptibility measurements on oriented single-crystalline samples show anisotropic response in a broad temperature range. The anisotropic susceptibility is quantitatively interpreted within the zero-field splitting schemes for Co{sup 2+} and Ni{sup 2+} ions. Sharp low-temperature susceptibility features, at T {sub N}=18 and 20 K for Co{sub 5}(SeO{sub 3}){sub 4}Cl{sub 2} and Co{sub 5}(SeO{sub 3}){sub 4}Br{sub 2}, respectively, are ascribed to antiferromagnetic ordering in a minority magnetic subsystem. In isostructural Ni{sub 5}(SeO{sub 3}){sub 4}Br{sub 2} magnetically ordered subsystem represents a majority fraction (T {sub N}=46 K). Nevertheless, anisotropic susceptibility of Ni{sub 5}(SeO{sub 3}){sub 4}Br{sub 2} is dominated at low temperatures by a minority fraction, subject to single-ion anisotropy effects and increasing population of S{sub z} =0 (singlet) ground state of octahedrally coordinated Ni{sup 2+}. - Graphical abstract: Two new iso-structural cobalt selenite halides Co{sub 5}(SeO{sub 3}){sub 4}Cl{sub 2} and Co{sub 5}(SeO{sub 3}){sub 4}Br{sub 2} have been synthesized which are iso-structural to Ni{sub 5}(SeO{sub 3}){sub 4}Br{sub 2}. Magnetic susceptibility measurements on oriented single-crystalline samples show anisotropic response in a broad temperature range, revealing significant single-ion anisotropy effects.

Becker, Richard [Department of Inorganic Chemistry, Stockholm University, S-106 91 Stockholm (Sweden)], E-mail: richard@inorg.su.se; Prester, Mladen [Institute of Physics, P.O. Box 304, HR-10000 Zagreb (Croatia); Berger, Helmuth [Institut de Physique de la Matiere Complexe, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne (Switzerland); Hui Lin, Ping [Institut de Physique de la Matiere Complexe, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne (Switzerland); Institute of Physics, Academia Sinica Nankang, Taipei 11529, Taiwan, ROC (China); Johnsson, Mats [Department of Inorganic Chemistry, Stockholm University, S-106 91 Stockholm (Sweden); Drobac, Djuro [Institute of Physics, P.O. Box 304, HR-10000 Zagreb (Croatia); Zivkovic, Ivica [Institute of Physics, P.O. Box 304, HR-10000 Zagreb (Croatia)

2007-03-15T23:59:59.000Z

446

Synthesis, structure and properties of the oxychalcogenide series A{sub 4}O{sub 4}TiSe{sub 4} (A=Sm, Gd, Tb, Dy, Ho, Er and Y)  

SciTech Connect (OSTI)

Seven oxyselenide materials have been synthesised with composition A{sub 4}O{sub 4}TiSe{sub 4} (A=Sm, Gd–Er, Y) via solid state reactions of A{sub 2}O{sub 3}, TiSe{sub 2} and Se at 900 °C. They are all isostructural with Gd{sub 4}O{sub 4}TiSe{sub 4}. Structures have been refined from powder X-ray diffraction data and have monoclinic C2/m symmetry with unit cell parameters of a?15.7 Å, b?3.75 Å, c?9.65 Å and ??117.5°. They contain infinite ribbons of edge-sharing A{sub 4}O and A{sub 3}TiO tetrahedra 4 units wide, which are linked by chains of TiSe{sub 4}O{sub 2} edge-sharing octahedra. Compositions A=Gd–Ho, Y are semiconductors with conductivities 1–3 Sm{sup ?1} at 300 K, with electronic band gaps of between 0.25 and 0.37 eV. Magnetic susceptibility is reported from 1.8 K to 300 K for compositions A=Gd–Ho. Rare earth moments appear to order antiferromagnetically at low temperatures with Gd and Tb showing evidence of ferromagnetism due to spin canting over a narrow temperature range close to T{sub N}. - Graphical abstract: Illustration of the A{sub 4}O{sub 4}TiSe{sub 4} crystal structure (C2/m symmetry), A{sub 4}O and A{sub 3}TiO edge sharing tetrahedral ribbons in red, chains of edge-sharing TiSe{sub 4}O{sub 2} in blue. Rare earth=green, titanium=blue, selenium=yellow, and oxygen=red. Display Omitted - Highlights: • Seven materials with A{sub 4}O{sub 4}TiSe{sub 4} (A=Sm, Gd–Er, Y) have been synthesised as bulk phases for the first time. • Materials are semiconductors and order antiferromagnetically at ?4 K. • Structure contains M{sub 4}O tetrahedral ribbons and TiSe{sub 4}O{sub 2} 1D octahedral chains.

Tuxworth, A.J.; Evans, J.S.O., E-mail: john.evans@durham.ac.uk

2014-02-15T23:59:59.000Z

447

Effect of annealing on the kinetic properties and band parameters of Hg{sub 1?x?y}Cd{sub x}Eu{sub y}Se semiconductor crystals  

SciTech Connect (OSTI)

The results of studies of the kinetic properties of Hg{sub 1?x?y}Cd{sub x}Eu{sub y}Se semiconductor crystals in the ranges of temperatures T = 77–300 K and magnetic fields H = 0.5–5 kOe before and after heat treatment of the samples in Se vapors are reported. It is established that annealing of the samples in Se vapors induces a decrease in the electron concentration. From the concentration dependence of the electron effective mass at the Fermi level, the band gap, the matrix element of interband interaction, and the electron effective mass at the bottom of the conduction band are determined.

Kovalyuk, T. T., E-mail: tarik-1006@mail.ru; Maistruk, E. V.; Maryanchuk, P. D. [Chernivtsy National University (Ukraine)

2014-12-15T23:59:59.000Z

448

FROM CELL TO SYMBOL: A BIOCULTURAL STUDY OF ANEMIA AND SUBJECTIVITY AMONG THE POQOMCHI' MAYA IN GUATEMALA  

E-Print Network [OSTI]

surrounding communities. Dozens of foot paths ascend the slopes, passing through and beyond the plantations that line the more fertile lower areas of the valley. These trails not only connect the communities to the main road and town, but also to other.... Indices of infant mortality, malnutrition, and fertility are some of the highest in Latin America, serving as a reflection of how this region was left decades behind others in terms of development (MSPAS, 2001). Given the ambiguous nature...

Herynk, James William

2014-05-31T23:59:59.000Z

449

Unthinkable Rebellion and the Praxis of the Possible: Ch'orti' Campesin@ Struggles in Guatemala's Eastern Highlands  

E-Print Network [OSTI]

opposition to mining, hydroelectric dams, and other mega-teams for proposed hydroelectric dams and mines in the dryaware of anti-mining, anti-hydroelectric, and protected area

Casolo, Jennifer Jean

2011-01-01T23:59:59.000Z

450

Lake Petn Itz, a 165 m deep lake in northern Guatemala, is the deepest lake in the lowlands of  

E-Print Network [OSTI]

deep- water sites in the central basin. All cores show an abrupt transition from Late Glacial dense gypCONTENTS Lake Petén Itzá 1 Scientific Drillling Project Drilling K-T and Chicxulub 3 Event Strata in Texas Deep Upcoming Conferences 9 Workshops 10 Iceland Deep Drilling 11 Project Congratulations to the 12 2006 DOSECC

Gilli, Adrian

451

Trace element and technological analyses of obsidian artifacts from the Northern ridge of Lake Atitlan, Department of Solola, Guatemala  

E-Print Network [OSTI]

formation processes affecting the archaeological remains of San Jose Chacaya. This lack of lithic materials supports the importation of obsidian to the San Jose Chacaya area by way of regional and interregional trade routes. Several trade routes spanning...

Woodward, Michelle Ruth

1996-01-01T23:59:59.000Z

452

Colonization, clear-cutting, and cornfields: Rural migration and deforestation in The Sierra de Lacandn National Park, Petn, Guatemala  

E-Print Network [OSTI]

1 Colonization, clear-cutting, and cornfields: Rural migration and deforestation in The Sierra de variability in the amount of forest cleared in the sample. While the high deforestation group cleared an average of 13.6 hectares, or 49% of their forest during the time period, the low deforestation group

Lopez-Carr, David

453

"Health is a business for everyone and is not a right to anyone:" Neoliberal health care provision in rural Guatemala  

E-Print Network [OSTI]

to reduce health disparities. These organizations used their economic power as leverage to promote neoliberal reforms in health care, focusing on decentralization and privatization. In this thesis, I explore the intended and unintended consequences...

Fernandes da Cunha Loureiro Amorim, Clarice

2012-08-31T23:59:59.000Z

454

Observation of an electron band above the Fermi level in FeTe{sub 0.55}Se{sub 0.45} from in-situ surface doping  

SciTech Connect (OSTI)

We used in-situ potassium (K) evaporation to dope the surface of the iron-based superconductor FeTe{sub 0.55}Se{sub 0.45}. The systematic study of the bands near the Fermi level confirms that electrons are doped into the system, allowing us to tune the Fermi level of this material and to access otherwise unoccupied electronic states. In particular, we observe an electron band located above the Fermi level before doping that shares similarities with a small three-dimensional pocket observed in the cousin, heavily electron-doped KFe{sub 2?x}Se{sub 2} compound.

Zhang, P.; Ma, J.; Qian, T. [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Richard, P., E-mail: p.richard@iphy.ac.cn; Ding, H., E-mail: dingh@iphy.ac.cn [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Collaborative Innovation Center of Quantum Matter, Beijing (China); Xu, N. [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI (Switzerland); Xu, Y.-M. [Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Fedorov, A. V.; Denlinger, J. D. [Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Gu, G. D. [Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)

2014-10-27T23:59:59.000Z

455

Anomalous transport in an n-type topological insulator ultrathin Bi2Se3 film Toru Hirahara,1,* Yusuke Sakamoto,1 Yasuo Takeichi,2 Hidetoshi Miyazaki,3 Shin-ichi Kimura,3 Iwao Matsuda,2  

E-Print Network [OSTI]

Anomalous transport in an n-type topological insulator ultrathin Bi2Se3 film Toru Hirahara,1, 73.61.Ng I. INTRODUCTION Topological insulators have attracted much attention from a wide variety, they are mathematically characterized by the so-called Z2 topological number.1 While the bulk is insulating

Hasegawa, Shuji

456

Por ms de 30 aos, el programa de CU Wizards ha presentado shows mensuales GRATIS que entretienen e informan a los nios sobre las maravillas de la ciencia. Estos shows interactivos se  

E-Print Network [OSTI]

e informan a los niños sobre las maravillas de la ciencia. Estos shows interactivos se presentan una Harvey "Ilusión y Realidad: La Ciencia de la Percepción" Duane G1B30 10/18/2014 Prof. Veronica Bierbaum

Lineberger, W. Carl

457

L'agriculture familiale se dfinit par le recours quasi-exclusif du travail familial, sans sa-laris permanents,et par des interrelations fortes entre les agriculteurs et leur exploitation.Le  

E-Print Network [OSTI]

1 #12;L'agriculture familiale se définit par le recours quasi-exclusif à du travail familial, sans agricultures familiales. Avec ses 500 millions d'exploitations, elles font vivre 2,6 milliards de personnes et, les agricultures familiales sont présentes sur tous les continents et dans tous les écosystèmes. Cette

458

Nano-Fabricated Extracellular Matrix Topography could Alter the Cancer Cell Behavior Kasun A. Gardiye Punchihewa1, Se Yong An1, Michael Cho2, Sarah Glover3and Vitali Metlushko1*  

E-Print Network [OSTI]

. Gardiye Punchihewa1, Se Yong An1, Michael Cho2, Sarah Glover3and Vitali Metlushko1* 1Department Glover. Cancer Cell International 2010, 10:24 This research brings together a team of interdisciplinary biology (Dr. Sarah Glover, UIC College of Medicine), cellular biomechanics and multimodal imaging (Dr

Metlushko, Vitali

459

GENOVIS AB, Box 790, SE-220 07 LUND, SWEDEN Phone +46 46 10 12 30 Fax +46 46 12 80 20 info@genovis.com www.genovis.com  

E-Print Network [OSTI]

GENOVIS AB, Box 790, SE-220 07 LUND, SWEDEN Phone +46 46 10 12 30 Fax +46 46 12 80 20 info LUND, SWEDEN Phone +46 46 10 12 30 Fax +46 46 12 80 20 info@genovis.com www.genovis.com APPLICATION

Lebendiker, Mario

460

Aysen, Chili, 21 Avril 2007 Le 21 Avril 2007 17h53 TU un sisme de magnitude 6.2 se produit dans les environs d'Aysen au sud  

E-Print Network [OSTI]

décrochante qui se trouve au voisinage de l'essaim de séismes. Les enregistrements des stations (sismo et GPS moment. Ce laboratoire a pour ambition d'étudier la sismo-tectonique de la subduction Chilienne et s

Vigny, Christophe

Note: This page contains sample records for the topic "guatemala se mencionan" 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

College of AgriCulturAl SCienCeS AgriCulturAl reSeArCh And CooperAtive extenSion Access and AllocAtion of  

E-Print Network [OSTI]

College of AgriCulturAl SCienCeS · AgriCulturAl reSeArCh And CooperAtive extenSion Access and Alloc- gation, recreation, and hydro- electric power generation, do not involve withdrawing water from its level of government is best suited to regulate water use. Predictions that climate change will influence

Boyer, Elizabeth W.

462

Influence of different sulfur to selenium ratios on the structural and electronic properties of Cu(In,Ga)(S,Se){sub 2} thin films and solar cells formed by the stacked elemental layer process  

SciTech Connect (OSTI)

In this study, we investigate the effect of different elemental selenium to elemental sulfur ratios on the chalcopyrite phase formation in Cu(In,Ga)(S,Se){sub 2} thin films. The films are formed by the stacked elemental layer process. The structural and electronic properties of the thin films and solar cells are analyzed by means of scanning electron microscopy, glow discharge optical emission spectrometry, X-ray diffraction, X-ray fluorescence, Raman spectroscopy, spectral photoluminescence as well as current-voltage, and quantum efficiency measurements. The influence of different S/(S+Se) ratios on the anion incorporation and on the Ga/In distribution is investigated. We find a homogenous sulfur concentration profile inside the film from the top surface to the bottom. External quantum efficiency measurements show that the band edge of the solar cell device is shifted to shorter wavelength, which enhances the open-circuit voltages. The relative increase of the open-circuit voltage with S/(S+Se) ratio is lower than expected from the band gap energy trend, which is attributed to the presence of S-induced defects. We also observe a linear decrease of the short-circuit current density with increasing S/(S+Se) ratio which can be explained by a reduced absorption. Above a critical S/(S+Se) ratio of around 0.61, the fill factor drops drastically, which is accompanied by a strong series resistance increase which may be attributed to changes in the back contact or p-n junction properties.

Mueller, B. J., E-mail: bjm.mueller@web.de [Robert Bosch GmbH, Corporate Research and Advance Engineering, Advanced Functional Materials and Microsystems, D-70839 Gerlingen (Germany); Institute of Micro- and Nanomaterials, University of Ulm, D-89081 Ulm (Germany); Zimmermann, C.; Haug, V., E-mail: veronika.haug@de.bosch.com; Koehler, T.; Zweigart, S. [Robert Bosch GmbH, Corporate Research and Advance Engineering, Advanced Functional Materials and Microsystems, D-70839 Gerlingen (Germany); Hergert, F. [Bosch Solar CISTech GmbH, D-14772 Brandenburg (Germany); Herr, U., E-mail: ulrich.herr@uni-ulm.de [Institute of Micro- and Nanomaterials, University of Ulm, D-89081 Ulm (Germany)

2014-11-07T23:59:59.000Z

463

Yale Center for Environmental Law & Policy Yale University  

E-Print Network [OSTI]

Castellanos Universidad del Valle de Guatemala Aaron Cohen AGI Health Effects Institute Thomas Damassa World

Columbia University

464

Voltage-induced electroluminescence characteristics of hybrid light-emitting diodes with CdSe/Cd/ZnS core-shell nanoparticles embedded in a conducting polymer on plastic substrates  

SciTech Connect (OSTI)

We investigate the electroluminescence (EL) characteristics of a hybrid light-emitting diode (HyLED) with an emissive layer comprised of CdSe/Cd/ZnS core-shell nanoparticles (NPs) embedded in poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO) on a plastic substrate. The EL characteristics change dramatically with increasing of the biased voltage. At low voltages, recombination of electrons and holes occurs only in the PFO film because of poor charge transfer in the PFO-CdSe/Cd/ZnS NPs composite film, while the color of the light-emitting from the HyLED changes from blue to red as the biased voltage increases from 7.5 to 17.5?V. We examine and discuss the mechanism of this color tunability.

Kwak, Kiyeol; Cho, Kyoungah, E-mail: chochem@korea.ac.kr, E-mail: sangsig@korea.ac.kr; Kim, Sangsig, E-mail: chochem@korea.ac.kr, E-mail: sangsig@korea.ac.kr [Department of Electrical Engineering, Korea University, Seoul 136-713 (Korea, Republic of)] [Department of Electrical Engineering, Korea University, Seoul 136-713 (Korea, Republic of)

2014-03-10T23:59:59.000Z

465

Effect of carrier density and valence states on superconductivity of oxygen annealed Fe{sub 1.06}Te{sub 0.6}Se{sub 0.4} single crystals  

SciTech Connect (OSTI)

The variations of carrier density and valence states in oxygen annealed Fe{sub 1.06}Te{sub 0.6}Se{sub 0.4} single crystals were studied systematically. It was found that the carrier density n{sub H} increases after oxygen annealing by Hall coefficient measurements. The X-ray photoelectron spectroscopy experiments reveal that the oxygen annealing changes Fe{sup 0} and Te{sup 0} states to Fe{sup 2+/3+} and Te{sup 4+}, respectively, while the valence variation of Se is negligible. Our results indicate that the improvement of superconductivity, such as the zero resistance transition temperature T{sub c}{sup zero}, shielding and Meissner fraction value 4?? and upper critical field H{sub c2}, could be closely related to the proper manipulation of n{sub H} and the valence states by oxygen annealing in the system.

Su, T. S.; Yin, Y. W., E-mail: yyw@ustc.edu.cn, E-mail: lixg@ustc.edu.cn; Teng, M. L.; Gong, Z. Z.; Zhang, M. J.; Li, X. G., E-mail: yyw@ustc.edu.cn, E-mail: lixg@ustc.edu.cn [Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026 (China)

2013-11-14T23:59:59.000Z

466

The reversal of the laser-beam-induced-current contrast with varying illumination density in a Cu{sub 2}ZnSnSe{sub 4} thin-film solar cell  

SciTech Connect (OSTI)

We apply an array of correlated spatially-resolved techniques, including ?-Raman/photoluminescence/reflectance/laser-beam-induced-current in conjunction with scanning electron microscopy and atomic force microscopy, to study the impact of the microscopic-scale thickness inhomogeneity of CdS layer in a Cu{sub 2}ZnSnSe{sub 4} thin-film solar cell. Thicker CdS regions are found to cause more light reflecting loss thus yield lower external quantum efficiencies and energy conversion efficiencies than the general area. However, these regions show much less efficiency degradation at high illumination intensity, leading to an inversion of laser-beam-induced-current contrast in the area mapping. While improving the CdS layer uniformity can boost the device performance, the finding further points out the possibility of operating thin-film photovoltaic devices based on the similar materials (such as CuInGaSe{sub 2}, CdTe, Cu{sub 2}ZnSn(S,Se){sub 4}) under a substantially higher illumination density for concentrated photovoltaic and photo-detection.

Chen, Qiong; Zhang, Yong, E-mail: yong.zhang@uncc.edu [Department of Electrical and Computer Engineering, and Energy Production and Infrastructure Center (EPIC), The University of North Carolina at Charlotte, Charlotte, North Carolina 28223 (United States)] [Department of Electrical and Computer Engineering, and Energy Production and Infrastructure Center (EPIC), The University of North Carolina at Charlotte, Charlotte, North Carolina 28223 (United States)

2013-12-09T23:59:59.000Z

467

Solar Cells from Plastics? Mission Possible at the PHaSE Energy Research Center, UMass Amherst (A "Life at the Frontiers of Energy Research" contest entry from the 2011 Energy Frontier Research Centers (EFRCs) Summit and Forum)  

ScienceCinema (OSTI)

'Solar Cells from Plastics? Mission Possible at the PHaSE Energy Research Center, UMass Amherst' was submitted by the Polymer-Based Materials for Harvesting Solar Energy (PHaSE) EFRC to the 'Life at the Frontiers of Energy Research' video contest at the 2011 Science for Our Nation's Energy Future: Energy Frontier Research Centers (EFRCs) Summit and Forum. Twenty-six EFRCs created short videos to highlight their mission and their work. PHaSE, an EFRC co-directed by Thomas P. Russell and Paul M. Lahti at the University of Massachusetts, Amherst, is a partnership of scientists from six institutions: UMass (lead), Oak Ridge National Laboratory, Pennyslvania State University, Rensselaer Polytechnic Institute, and the University of Pittsburgh. The Office of Basic Energy Sciences in the U.S. Department of Energy's Office of Science established the 46 Energy Frontier Research Centers (EFRCs) in 2009. These collaboratively-organized centers conduct fundamental research focused on 'grand challenges' and use-inspired 'basic research needs' recently identified in major strategic planning efforts by the scientific community. The overall purpose is to accelerate scientific progress toward meeting the nation's critical energy challenges.

Russell, Thomas P; Lahti, Paul M. (PHaSE - Polymer-Based Materials for Harvesting Solar Energy); PHaSE Staff

2011-11-03T23:59:59.000Z

468

Structural and conductivity studies of CsK(SO{sub 4}){sub 0.32}(SeO{sub 4}){sub 0.68}Te(OH){sub 6}  

SciTech Connect (OSTI)

The compound CsK(SO{sub 4}){sub 0.32}(SeO{sub 4}){sub 0.68}Te(OH){sub 6} crystallizes in the monoclinic P2{sub 1}/n space group. It was analyzed, at room temperature, using X-ray diffractometer data. The main feature of these atomic arrangements is the coexistence of three and different anions (SO{sub 4}{sup 2-}, SeO{sub 4}{sup 2-} and TeO{sub 6}{sup 6-}groups) in the unit cell, connected by hydrogen bonds which make the building of the crystal. The thermal analysis of the title compound shows three distinct endothermal peaks at 435, 460 and 475 K. Complex impedance measurements are performed on this material as a function of both temperature and frequency. The electric conduction has been studied. The temperature dependence on the conductivity indicates that the sample became an ionic conductor at high temperature. - Graphical abstract: Projection of crystal structure CsK(SO{sub 4}){sub 0.32}(SeO{sub 4}){sub 0.68}Te(OH){sub 6} on the ab plane. Highlights: Black-Right-Pointing-Pointer We have studied the results of the crystal structure of the new mixed compound. Black-Right-Pointing-Pointer We have characterized the phase transition observed in DSC curve. Black-Right-Pointing-Pointer The protonic conduction in our material is probably due to a hopping mechanism.

Djemel, M., E-mail: jmal_manel@yahoo.fr [Laboratoire de Chimie Inorganique, Universite de Sfax, Faculte des Sciences de Sfax, BP 1171, 3000 Sfax (Tunisia); Abdelhedi, M., E-mail: m_abdelhedi2002@yahoo.fr [Laboratoire de Chimie Inorganique, Universite de Sfax, Faculte des Sciences de Sfax, BP 1171, 3000 Sfax (Tunisia); Laboratoire Leon Brouillon, CE/Saclay, 91191 Gif-Sur-Yvette Cedex (France); Zouari, N., E-mail: bizrirl@yahoo.fr [Laboratoire de l'Etat solide, Universite de Sfax, Faculte des Sciences de Sfax, BP 1171, 3000 Sfax (Tunisia); Dammak, M., E-mail: meddammak@yahoo.fr [Laboratoire de Chimie Inorganique, Universite de Sfax, Faculte des Sciences de Sfax, BP 1171, 3000 Sfax (Tunisia); Kolsi, A.W., E-mail: kolsi_abdelhwaheb@yahoo.fr [Laboratoire de Chimie Inorganique, Universite de Sfax, Faculte des Sciences de Sfax, BP 1171, 3000 Sfax (Tunisia)

2012-12-15T23:59:59.000Z

469

Theoretical study of influencing factors on the dispersion of bulk band-gap edges and the surface states in topological insulators Bi{sub 2}Te{sub 3} and Bi{sub 2}Se{sub 3}  

SciTech Connect (OSTI)

The dispersion of the band-gap edge states in bulk topological insulators Bi{sub 2}Te{sub 3} and Bi{sub 2}Se{sub 3} is considered within density functional theory. The dependences of this dispersion both on the approximation used for an exchange-correlation functional at fixed unit cell parameters and atomic positions and on these parameters and positions that are obtained upon structural relaxation performed using a certain approximated functional are analyzed. The relative position of the Dirac point of topologically protected surface states and the valence band maximum in the surface electronic structure of the topological insulators is discussed.

Rusinov, I. P., E-mail: rusinovip@gmail.com; Nechaev, I. A. [Tomsk State University (Russian Federation); Chulkov, E. V. [Donostia International Physics Center (DIPC) (Spain)

2013-06-15T23:59:59.000Z

470

Lattice location and local magnetism of recoil implanted Fe impurities in wide and narrow band semiconductors CdTe, CdSe, and InSb: Experiment and theory  

SciTech Connect (OSTI)

Employing the time differential perturbed angular distribution method, we have measured local susceptibility and spin relaxation rate of {sup 54}Fe nuclei implanted in III-V and II-VI semiconductors, CdTe, CdSe, and InSb. The magnetic response of Fe, identified to occupy the metal as well as the semi-metal atom sites, exhibit Curie-Weiss type susceptibility and Korringa like spin relaxation rate, revealing the existence of localized moments with small spin fluctuation temperature. The experimental results are supported by first principle electronic structure calculations performed within the frame work of density functional theory.

Mohanta, S. K.; Mishra, S. N. [Tata Institute of Fundamental Research (TIFR), Homi Bhabha Road, Mumbai 400005 (India)

2014-05-07T23:59:59.000Z

471

National Comfort Products: Order (2010-SE-0307)  

Broader source: Energy.gov [DOE]

DOE ordered National Comfort Products to pay an $8,000 civil penalty after finding NCP had failed to conduct the required testing to certify that certain models of central air conditioners comply with the applicable energy conservation standard.

472

NPS-SE-08-004 POSTGRADUATE  

E-Print Network [OSTI]

Christopher LeFever Mr Weng Heng Chua CPT Chun Hong Low CPT Lee Tat Lim, Rudy Mr Yew Heng Kwok Mr Eng Siong Ng

473

Grainger: Noncompliance Determination (2013-SE-1411)  

Broader source: Energy.gov [DOE]

DOE issued a Notice of Noncompliance Determination to Grainger International Inc. finding that freezer models, privately labeled as the Dayton 5NTX4, the Dayton 5NTX5, and the Dayton 5NTX6 do not comport with the energy conservation standards.

474

CNA: Compromise Agreement (2013-SE-1430)  

Broader source: Energy.gov [DOE]

DOE and CNA International, Inc., d/b/a MC Appliance Corp. entered into a Compromise Agreement to resolve a case involving the distribution in commerce of noncompliant freezers.

475

Golden Opportunity: Compromise Agreement (2013-SE-1418)  

Broader source: Energy.gov [DOE]

DOE and Golden Opportunity, Inc. entered into a Compromise Agreement to resolve a case involving the distribution in commerce of noncompliant freezers.

476

Teddico: Noncompliance Determination (2012-SE-5409)  

Broader source: Energy.gov [DOE]

DOE issued a Notice of Noncompliance Determination to The Electrical Design, Development and Implementation Company d/b/a Teddico finding that a variety of basic models of magnetic probe-start metal halide lamp fixtures do not comport with the energy conservation standards.

477

Engineered Products: Noncompliance Determination (2012-SE-5401)  

Broader source: Energy.gov [DOE]

DOE issued a Notice of Noncompliance Determination to Engineered Products Company finding that basic model 15701 of metal halide lamp fixture does not comport with the energy conservation standards.

478

Engineered Products: Proposed Penalty (2012-SE-5401)  

Broader source: Energy.gov [DOE]

DOE alleged in a Notice of Proposed Civil Penalty that Engineered Products Company manufactured/privately-labeled and distributed a number of units of noncompliant basic model 15701, a metal halide lamp fixture with a magnetic probe-start ballast in the U.S.

479

Engineered Products: Order (2012-SE-5401)  

Broader source: Energy.gov [DOE]

DOE ordered Engineered Products Company to pay a $480 civil penalty after finding EPCO had manufactured/privately labeled and distributed in commerce in the U.S. 19 units of basic model 15701, a metal halide lamp fixture.

480

Aktiebolaget SKF SE-415 50 Gteborg, Sweden  

E-Print Network [OSTI]

with Cambridge University Department of Materials Science and Metallurgy to set up the SKF University Technology in the physical metallurgy of steels. And they attract the very best and brightest people who will underpin our in". The objective of the cooperation will be to rapidly advance SKF's knowledge of the physical metallurgy

Cambridge, University of

Note: This page contains sample records for the topic "guatemala se mencionan" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Goodman Manufacturing: Noncompliance Determination (2011-SE-4301)  

Broader source: Energy.gov [DOE]

DOE issued a Notice of Noncompliance Determination to Goodman Manufacturing finding that model CPC180XXX3BXXXAA (CPC180*) of commercial package air conditioner does not comport with the energy conservation standards.

482

Goodman Manufacturing: Proposed Penalty (2011-SE-4301)  

Broader source: Energy.gov [DOE]

DOE alleged in a Notice of Proposed Civil Penalty that Goodman Manufacturing manufactured and distributed noncompliant basic model CPC180* commercial package air conditioners in the U.S.

483

Mile High: Noncompliance Determination (2012-SE-4501)  

Broader source: Energy.gov [DOE]

DOE issued a Notice of Noncompliance Determination to Mile High Equipment, LLC finding that Ice-O-Matic brand automatic commercial ice maker basic model ICE2106 FW, HW does not comport with the energy conservation standards.

484

Philips: Noncompliance Determination (2012-SE-2605)  

Broader source: Energy.gov [DOE]

DOE issued a Notice of Noncompliance Determination to Philips Lighting Electronics N. A. finding that basic model VEL-I S40-SC, a fluorescent lamp ballast, does not comport with the energy conservation standards.

485

Haier: Compromise Agreement (2011-SE-1408)  

Broader source: Energy.gov [DOE]

DOE and Haier America Trading, L.L.C., entered into a Compromise Agreement to resolve a case involving the distribution in commerce of noncompliant freezers.

486

Contact us at: 420 Delaware St. SE  

E-Print Network [OSTI]

or "osteoporosis". Nutrition recommendations to minimize the risk of osteoporosis are as follows: 1. Calcium

Thomas, David D.

487

Lutron Electronics: Noncompliance Determination (2012-SE-3796)  

Broader source: Energy.gov [DOE]

DOE issued a Notice of Noncompliance Determination to Lutron Electronics Co., Inc. finding that a variety of Class A external power supply basic models do not comport with the energy conservation standards.

488

Lutron Electronics: Order (2012-SE-3796)  

Broader source: Energy.gov [DOE]

DOE ordered Lutron Electronics Co., Inc. to pay a $13,000 civil penalty after finding Lutron Electronics had manufactured and distributed in commerce in the U.S. at least 79,000 units of various basic models, noncompliant Class A external power supplies.

489

Aspen: Noncompliance Determination (2010-SE-0305)  

Broader source: Energy.gov [DOE]

DOE issued a Notice of Noncompliance Determination to Aspen Manufacturing finding that a variety of basic models of split-system air conditioning heat pumps do not comport with the energy conservation standards.

490

Aspen: Noncompliance Determination (2011-SE-1602)  

Broader source: Energy.gov [DOE]

DOE issued a Notice of Noncompliance Determination to Aspen Manufacturing finding that indoor unit model AEW244 and outdoor unit model NCPC-424-3010 of residential split system central air conditioning system do not comport with the energy conservation standards.

491

Thermo Products: Order (2011-SE-1603)  

Broader source: Energy.gov [DOE]

DOE ordered Thermo Products, LLC, to pay a $6,000 civil penalty after finding Thermo Products had failed to conduct the required testing to certify that certain models of central air conditioning heat pumps comply with the applicable energy conservation standard.

492

Thermo Products: Proposed Penalty (2011-SE-1603)  

Broader source: Energy.gov [DOE]

DOE issued this Notice of Proposed Civil Penalty Notice to Thermo Products, LLC, alleging that the company certified several models of residential air conditioning heat pumps without performing testing required by DOE regulations.

493

Contact us at: 420 Delaware St. SE  

E-Print Network [OSTI]

and counseling patients/family during MDA clinic visits. We use a team approach in the MDA sponsored Clinic patient, situation and disease course is unique; although you can get many useful general facts from websites, patients must interpret that information based on their own situation as described by their MD

Thomas, David D.

494

National Comfort Products: Order (2014-SE-16014)  

Broader source: Energy.gov [DOE]

DOE ordered National Comfort Products to pay a $16,000 civil penalty after finding National Comfort Products had failed to certify that certain models of central air conditioners and heat pumps comply with the applicable energy conservation standards.

495

212 Union Ave, SE Olympia, WA 98501  

E-Print Network [OSTI]

capacity, energy and operational characteristics by conservation and renewables, particularly given, the nation, and nations around the world begin to document and seek to reduce the amount of greenhouse gas). More fossil fuel helped meet the demands of economic growth, since the region's hydropower system lost

496

Perlick: Noncompliance Determination (2013-SE-14002) | Department...  

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

and records showing the number of units Perlick distributed and to whom. The manufacturer andor private labeler of the product may be subject to civil penalties. Perlick:...

497

Whirlpool: Noncompliance Determination (2013-SE-1420) | Department...  

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

and records showing the number of units Whirlpool distributed and to whom. The manufacturer andor private labeler of the product may be subject to civil penalties. Whirlpool:...

498

Bigwall: Noncompliance Determination (2014-SE-15006) | Department...  

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

and records showing the number of units Bigwall distributed and to whom. The manufacturer andor private labeler of the product may be subject to civil penalties. Bigwall:...

499

KTH Mechanics SE-100 44 Stockholm, Sweden  

E-Print Network [OSTI]

Graduate courses 5. Research activities 5. 1 Doctoral theses defended 2008 5. 2 Licentiate theses presented doctoral theses and presentations of five licentiate theses during 2008. The publication list their Licentiate theses. The department also, together with the Department of Solid Mechanics, serves as host

Haviland, David

500

KTH Mechanics SE-100 44 Stockholm, Sweden  

E-Print Network [OSTI]

Graduate courses 5. Research activities 5. 1 Doctoral theses defended 5. 2 Licentiate theses presented 5. 3 activity of the department resulted in the defences of 7 doctoral theses and presentations of 6 licentiate their Licentiate theses. The department also, together with the Department of Solid Mechanics and the Marcus

Haviland, David