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Sample records for nanoclusters out-perform single

  1. Platinum Nanoclusters Out-Perform Single Crystals

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  2. Platinum Nanoclusters Out-Perform Single Crystals

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  3. Platinum Nanoclusters Out-Perform Single Crystals

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

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  4. Platinum Nanoclusters Out-Perform Single Crystals

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

    The next steps will be to determine whether other adsorbed reactants, such as oxygen or hydrogen, also result in the creation of nanoclusters in platinum. Exploring metals that...

  5. Platinum Nanoclusters Out-Perform Single Crystals

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  6. Platinum Nanoclusters Out-Perform Single Crystals

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  7. Platinum Nanoclusters Out-Perform Single Crystals

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  8. Platinum Nanoclusters Out-Perform Single Crystals

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

    material presents major challenges for the future wide-scale use of platinum in fuel cells. Berkeley Lab research suggests that one possible way to meet these challenges is to...

  9. Platinum Nanoclusters Out-Perform Single Crystals

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

    in platinum. Exploring metals that catalyze other important reactions-such as palladium, silver, copper, rhodium, iron, and cobalt-might also help researchers determine...

  10. Platinum Nanoclusters Out-Perform Single Crystals

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

    in detail because reaction conditions in the lab-near-vacuum pressures and near-freezing temperatures to achieve high coverage of adsorbates-do not produce results that...

  11. Platinum Nanoclusters Out-Perform Single Crystals

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

    Improving Industrial Catalysts Catalysts-substances that speed up the rates of chemical reactions without themselves being chemically changed-are used to initiate...

  12. Platinum Nanoclusters Out-Perform Single Crystals

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

    automobile catalytic converters, and the degradation of platinum electrodes in hydrogen fuel cells. As the carbon monoxide coverage of the platinum surfaces increased, the...

  13. Platinum Nanoclusters Out-Perform Single Crystals

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  14. Platinum Nanoclusters Out-Perform Single Crystals

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  15. Platinum Nanoclusters Out-Perform Single Crystals

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

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  16. Platinum Nanoclusters Out-Perform Single Crystals

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  17. Platinum Nanoclusters Out-Perform Single Crystals

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

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  18. Platinum Nanoclusters Out-Perform Single Crystals

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

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  19. Anchoring Pd nanoclusters onto pristine and functionalized single-wall carbon nanotubes: A combined DFT and experimental study

    E-Print Network [OSTI]

    Resasco, Daniel

    in heteroge- neous catalysis [1], fuel cells [2,3] and sensors [4­6]. Both multi- and single-wall carbon- nation on the organic phase. This combination is particularly relevant in the upgrading of bio) or oxygen-functionalized [15]. The functional groups were introduced by treating the SWCNT with HNO3 3 M

  20. The Evolution in Pu Nanocluster Electronic Structure: from Atomicity...

    Office of Scientific and Technical Information (OSTI)

    The Evolution in Pu Nanocluster Electronic Structure: from Atomicity to Three Dimensionality Citation Details In-Document Search Title: The Evolution in Pu Nanocluster Electronic...

  1. Nanocluster production for solar cell applications

    SciTech Connect (OSTI)

    Al Dosari, Haila M.; Ayesh, Ahmad I.

    2013-08-07

    This research focuses on the fabrication and characterization of silver (Ag) and silicon (Si) nanoclusters that might be used for solar cell applications. Silver and silicon nanoclusters have been synthesized by means of dc magnetron sputtering and inert gas condensation inside an ultra-high vacuum compatible system. We have found that nanocluster size distributions can be tuned by various source parameters, such as the sputtering discharge power, flow rate of argon inert gas, and aggregation length. Quadrupole mass filter and transmission electron microscopy were used to evaluate the size distribution of Ag and Si nanoclusters. Ag nanoclusters with average size in the range of 3.6–8.3 nm were synthesized (herein size refers to the nanocluster diameter), whereas Si nanoclusters' average size was controlled to range between 2.9 and 7.4 nm by controlling the source parameters. This work illustrates the ability of controlling the Si and Ag nanoclusters' sizes by proper optimization of the operation conditions. By controlling nanoclusters' sizes, one can alter their surface properties to suit the need to enhance solar cell efficiency. Herein, Ag nanoclusters were deposited on commercial polycrystalline solar cells. Short circuit current (I{sub SC}), open circuit voltage (V{sub OC}), fill factor, and efficiency (?) were obtained under light source with an intensity of 30 mW/cm{sup 2}. A 22.7% enhancement in solar cell efficiency could be measured after deposition of Ag nanoclusters, which demonstrates that Ag nanoclusters generated in this work are useful to enhance solar cell efficiency.

  2. Purification of recombinant proteins with magnetic nanoclusters

    E-Print Network [OSTI]

    Ditsch, Andre (Andre Paul)

    2005-01-01

    This thesis focused on the development and analysis of a new class of magnetic fluids for recovery of recombinant proteins from fermentation broth. Magnetic fluids are colloidally stable dispersions of magnetic nanoclusters ...

  3. Los Alamos explores hybrid ultrasmall gold nanocluster for enzymatic...

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

    Alamos explores hybrid ultrasmall gold nanocluster for enzymatic fuel cells With fossil-fuel sources dwindling, better biofuel cell design is a strong candidate in the energy...

  4. Interfacial electron transfer dynamics of photosensitized zinc oxide nanoclusters

    SciTech Connect (OSTI)

    Murakoshi, Kei; Yanagida, Shozo; Capel, M.

    1997-06-01

    The authors have prepared and characterized photosensitized zinc oxide (ZnO) nanoclusters, dispersed in methanol, using carboxylated coumarin dyes for surface adsorption. Femtosecond time-resolved emission spectroscopy allows the authors to measure the photo-induced charge carrier injection rate constant from the adsorbed photosensitizer to the n-type semiconductor nanocluster. These results are compared with other photosensitized semiconductors.

  5. Fabrication of metallic nanostructures from sputtered nanocluster precursors

    E-Print Network [OSTI]

    DelHagen, William S

    2004-01-01

    This thesis studies the morphological and electrical properties of copper nanocluster devices generated by DC magnetron sputtering and annealed at temperatures up to 1100 C. At each annealing step, the resistivity of the ...

  6. Structure of Palladium Nanoclusters for Hydrogen Gas Sensors

    SciTech Connect (OSTI)

    Stevens, K.J.; Ingham, B.; Toney, M.F.; Brown, S.A.; Lassesson, A.; /SLAC, SSRL /Canterbury U.

    2009-05-11

    Palladium nanoclusters produced by inert gas aggregation/magnetron sputtering are used as building blocks for the construction of nano electronic devices with large surface to volume ratios that can be used as sensitive hydrogen gas sensors in fuel cells and in petrochemical plants. X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), and high resolution transmission electron microscopy (HRTEM) have been used to characterize the structure, lattice constant, particle diameter and oxide thickness of the palladium nanoclusters in order to understand the operation of these sensors. Grazing incidence XRD (GIXRD) of heat treated Pd clusters has shown that the palladanite structure forms at elevated temperatures.

  7. A hybrid DNA-templated gold nanocluster for enhanced enzymatic reduction of oxygen

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

    Chakraborty, Saumen; Babanova, Sofia; Rocha, Reginaldo C.; Desireddy, Anil; Artyushkova, Kateryna; Boncella, Amy E.; Atanassov, Plamen; Martinez, Jennifer S.

    2015-08-19

    We report the synthesis and characterization of a new DNA-templated gold nanocluster (AuNC) of ~1 nm in diameter and possessing ~7 Au atoms. When integrated with bilirubin oxidase (BOD) and single walled carbon nanotubes (SWNTs), the AuNC acts as an enhancer of electron transfer (ET) and lowers the overpotential of electrocatalytic oxygen reduction reaction (ORR) by ~15 mV as compared to the enzyme alone. In addition, the presence of AuNC causes significant enhancements in the electrocatalytic current densities at the electrode. Control experiments show that such enhancement of ORR by the AuNC is specific to nanoclusters and not to plasmonicmore »gold particles. Rotating ring disk electrode (RRDE) measurements confirm 4e– reduction of O2 to H2O with minimal production of H2O2, suggesting that the presence of AuNC does not perturb the mechanism of ORR catalyzed by the enzyme. This unique role of the AuNC as enhancer of ET at the enzyme-electrode interface makes it a potential candidate for the development of cathodes in enzymatic fuel cells, which often suffer from poor electronic communication between the electrode surface and the enzyme active site. In conclusion, the AuNC displays phosphorescence with large Stokes shift and microsecond lifetime.« less

  8. Probing the photoluminescence properties of gold nanoclusters by fluorescence lifetime correlation spectroscopy

    SciTech Connect (OSTI)

    Yuan, C. T., E-mail: ctyuan@cycu.edu.tw; Lin, T. N.; Shen, J. L. [Department of Physics, Chung Yuan Christian University, Chung-Li, Taiwan (China) [Department of Physics, Chung Yuan Christian University, Chung-Li, Taiwan (China); Center for Biomedical Technology, Chung Yuan Christian University, Taiwan (China); Lin, C. A.; Chang, W. H. [Center for Biomedical Technology, Chung Yuan Christian University, Taiwan (China) [Center for Biomedical Technology, Chung Yuan Christian University, Taiwan (China); Department of Biomedical Engineering, Chung Yuan Christian University, Taiwan (China); Cheng, H. W. [Department of Engineering and system science, National Tsing Hua University, Taiwan (China)] [Department of Engineering and system science, National Tsing Hua University, Taiwan (China); Tang, J., E-mail: jautang@gate.sinica.edu.tw [Research Center for Applied Sciences, Academia Sinica, Taiwan (China)

    2013-12-21

    Gold nanoclusters (Au NCs) have attracted much attention for promising applications in biological imaging owing to their tiny sizes and biocompatibility. So far, most efforts have been focused on the strategies for fabricating high-quality Au NCs and then characterized by conventional ensemble measurement. Here, a fusion single-molecule technique combining fluorescence correlation spectroscopy and time-correlated single-photon counting can be successfully applied to probe the photoluminescence (PL) properties for sparse Au NCs. In this case, the triplet-state dynamics and diffusion process can be observed simultaneously and the relevant time constants can be derived. This work provides a complementary insight into the PL mechanism at the molecular levels for Au NCs in solution.

  9. Formation of Ge nanoclusters on Si(1 1 1)-7 7 surface at high temperature

    E-Print Network [OSTI]

    Gao, Hongjun

    Formation of Ge nanoclusters on Si(1 1 1)-7 · 7 surface at high temperature H.M. Guo, Y.L. Wang, H for publication 17 May 2004 Available online 5 June 2004 Abstract We report on Ge nanocluster formation on Si(1 1 of the Ge clusters are more uniform than those obtained at room temperature due to an increase

  10. Size-Dependent Specific Surface Area of Nanoporous Film Assembled by Core-Shell Iron Nanoclusters

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

    Antony, Jiji; Nutting, Joseph; Baer, Donald R.; Meyer, Daniel; Sharma, Amit; Qiang, You

    2006-01-01

    Nanoporous films of core-shell iron nanoclusters have improved possibilities for remediation, chemical reactivity rate, and environmentally favorable reaction pathways. Conventional methods often have difficulties to yield stable monodispersed core-shell nanoparticles. We produced core-shell nanoclusters by a cluster source that utilizes combination of Fe target sputtering along with gas aggregations in an inert atmosphere at 7 ? C . Sizes of core-shell iron-iron oxide nanoclusters are observed with transmission electron microscopy (TEM). The specific surface areas of the porous films obtained from Brunauer-Emmett-Teller (BET) process are size-dependent and compared with the calculated data.more »« less

  11. Anomalous thermal relaxation in carbon nanoclusters Alexander V. Savin1,2,a

    E-Print Network [OSTI]

    of an absorbing particle is heated non- uniformly, the surrounding gas molecules rebound off the surface the centers of atoms, energy LJ=0.004 556 eV, and parameter =0.3851 nm. Then, the cubic nanocluster composed

  12. Photo-oxidation method using MoS2 nanocluster materials

    DOE Patents [OSTI]

    Wilcoxon, Jess P. (Albuquerque, NM)

    2001-01-01

    A method of photo-oxidizing a hydrocarbon compound is provided by dispersing MoS.sub.2 nanoclusters in a solvent containing a hydrocarbon compound contaminant to form a stable solution mixture and irradiating the mixture to photo-oxide the hydrocarbon compound. Hydrocarbon compounds of interest include aromatic hydrocarbon and chlorinated hydrocarbons. MoS.sub.2 nanoclusters with an average diameter less than approximately 10 nanometers are shown to be effective in decomposing potentially toxic aromatic and chlorinated hydrocarbons, such as phenol, pentachlorophenol, chlorinated biphenols, and chloroform, into relatively non-toxic compounds. The irradiation can occur by exposing the MoS.sub.2 nanoclusters and hydrocarbon compound mixture with visible light. The MoS.sub.2 nanoclusters can be introduced to the toxic hydrocarbons as either a MoS.sub.2 solution or deposited on a support material.

  13. Scanning tunneling microscopic studies of SiO2 thin film supported metal nano-clusters 

    E-Print Network [OSTI]

    Min, Byoung Koun

    2005-11-01

    This dissertation is focused on understanding heterogeneous metal catalysts supported on oxides using a model catalyst system of SiO2 thin film supported metal nano-clusters. The primary technique applied to this study is scanning tunneling...

  14. Encapsulation of nanoclusters in dried gel materials via an inverse micelle/sol gel synthesis

    SciTech Connect (OSTI)

    Martino, A.; Yamanaka, S.A.; Kawola, J.S.; Showalter, S.K.; Loy, D.A.

    1998-09-29

    A dried gel material sterically entrapping nanoclusters of a catalytically active material and a process to make the material via an inverse micelle/sol-gel synthesis are disclosed. A surfactant is mixed with an apolar solvent to form an inverse micelle solution. A salt of a catalytically active material, such as gold chloride, is added along with a silica gel precursor to the solution to form a mixture. To the mixture are then added a reducing agent for the purpose of reducing the gold in the gold chloride to atomic gold to form the nanoclusters and a condensing agent to form the gel which sterically entraps the nanoclusters. The nanoclusters are normally in the average size range of from 5--10 nm in diameter with a monodisperse size distribution. 1 fig.

  15. Encapsulation of nanoclusters in dried gel materials via an inverse micelle/sol gel synthesis

    SciTech Connect (OSTI)

    Martino, Anthony (Albuquerque, NM); Yamanaka, Stacey A. (Dallas, TX); Kawola, Jeffrey S. (Albuquerque, NM); Showalter, Steven K. (Albuquerque, NM); Loy, Douglas A. (Albuquerque, NM)

    1998-01-01

    A dried gel material sterically entrapping nanoclusters of a catalytically active material and a process to make the material via an inverse micelle/sol-gel synthesis. A surfactant is mixed with an apolar solvent to form an inverse micelle solution. A salt of a catalytically active material, such as gold chloride, is added along with a silica gel precursor to the solution to form a mixture. To the mixture are then added a reducing agent for the purpose of reducing the gold in the gold chloride to atomic gold to form the nanoclusters and a condensing agent to form the gel which sterically entraps the nanoclusters. The nanoclusters are normally in the average size range of from 5-10 nm in diameter with a monodisperse size distribution.

  16. Mechanism of Co nanocluster burrowing on Cu,,100... J. Frantz and K. Nordlund

    E-Print Network [OSTI]

    Nordlund, Kai

    for the devel- opment of new high-density storage devices.2 Supported magnetic nanoclusters on inert substrates could play a significant role in the optimization of the manufactoring process of nanostructured films

  17. CO Oxidation at the Interface between Doped CeO2 and Supported Au Nanoclusters

    E-Print Network [OSTI]

    Henkelman, Graeme

    nanoclusters (NCs) supported on either CeO2 or doped (X-Ce)O2 (X = Au, Pt, Pd, Ti, Ru, Zr) show that dopingCO Oxidation at the Interface between Doped CeO2 and Supported Au Nanoclusters Hyun You Kim, we study the e ect of doping on CO oxidation catalyzed by CeO2-supported Au13 NCs and, especially, CO

  18. Developing a Millifluidic Platform for the Synthesis of Ultrasmall Nanoclusters: Ultrasmall Copper Nanoclusters as a Case Study

    SciTech Connect (OSTI)

    Biswas, Sanchita [Louisiana State Univ., Baton Rouge, LA (United States). Center for Advanced Microstructures and Devices and Center for Atomic-level Catalysts Design; Miller, Jeffrey T. [Argonne National Lab. (ANL), Argonne, IL (United States); Li, Yuehao [Louisiana State Univ., Baton Rouge, LA (United States). Cain Dept. of Chemical Engineering; Nandakumar, Krishnaswamy [Louisiana State Univ., Baton Rouge, LA (United States). Cain Dept. of Chemical Engineering; Kumar, Challa S.S.R. [Louisiana State Univ., Baton Rouge, LA (United States). Center for Advanced Microstructures and Devices and Center for Atomic-level Catalysts Design

    2012-02-02

    The future of lab-on-a-chip devices for the synthesis of nanomaterials hinges on the successful development of high-throughput methods with better control over their size. While significant effort in this direction mainly focuses on developing “difficult to fabricate” complex microfluidic reactors, scant attention has been paid to the “easy to fabricate” and simple millifluidic systems that could provide the required control as well as high throughput. By utilizing numerical simulation of fluids within the millifluidic space at different flow rates, the results presented here show velocity profiles and residence time distributions similar to the case of microfluidics. By significantly reducing the residence time and residence time distribution, a continuous flow synthesis of ultrasmall copper nanoclusters (UCNCs) with exceptional colloidal stability is achieved. In-situ synchrotron-radiation-based X-ray absorption spectroscopy (XAS) reveal that the as-prepared clusters are about 1 nm, which is further supported by transmission electron microscopy and UV–vis spectroscopy studies. The clusters reported here are the smallest ever produced using a lab-on-a-chip platform. When supported on silica, they are found to efficiently catalyze C–H oxidation reactions, hitherto unknown to be catalyzed by Cu. This work suggests that a millifluidic platform can be an inexpensive, versatile, easy-to-use, and powerful tool for nanoparticle synthesis in general, and more specifically for ultrasmall nanoclusters (UNCs).

  19. Nanocluster building blocks of artificial square spin ice: Stray-field studies of thermal dynamics

    SciTech Connect (OSTI)

    Pohlit, Merlin Porrati, Fabrizio; Huth, Michael; Müller, Jens

    2015-05-07

    We present measurements of the thermal dynamics of a Co-based single building block of an artificial square spin ice fabricated by focused electron-beam-induced deposition. We employ micro-Hall magnetometry, an ultra-sensitive tool to study the stray field emanating from magnetic nanostructures, as a new technique to access the dynamical properties during the magnetization reversal of the spin-ice nanocluster. The obtained hysteresis loop exhibits distinct steps, displaying a reduction of their “coercive field” with increasing temperature. Therefore, thermally unstable states could be repetitively prepared by relatively simple temperature and field protocols allowing one to investigate the statistics of their switching behavior within experimentally accessible timescales. For a selected switching event, we find a strong reduction of the so-prepared states' “survival time” with increasing temperature and magnetic field. Besides the possibility to control the lifetime of selected switching events at will, we find evidence for a more complex behavior caused by the special spin ice arrangement of the macrospins, i.e., that the magnetic reversal statistically follows distinct “paths” most likely driven by thermal perturbation.

  20. Particle size effect of hydrogen-induced lattice expansion of palladium nanoclusters.

    SciTech Connect (OSTI)

    Ingham, B.; Toney, M. F.; Hendy, S. C.; Cox, T.; Fong, D. D.; Eastman, J. A.; Fuoss, P. H.; Stevens, K. J.; Lassesson, A.; Brown, S. A.; Ryan, M. P.; Materials Science Division; Industrial Research Ltd.; Stanford Synchrotron Radiation Lab.; Victoria Univ. of Wellington; Quest Reliability Ltd.; Univ. of Canterbury; Imperial Coll.

    2008-12-01

    In situ synchrotron x-ray diffraction experiments on bare palladium nanoclusters prepared by inert-gas aggregation and size selected (1.7-6.0 nm) show significant changes in lattice parameter upon hydrogen loading and a narrowing of the miscibility gap, as the cluster size decreases. The results show that the miscibility gap is open for all cluster sizes studied, in contrast to previous literature results from surfactant-encapsulated palladium clusters. We interpret these results by showing that the nature of the surface is critical in the hydrogenation behavior of the nanoclusters.

  1. Particle Size Effect of Hydrogen-Induced Lattice Expansion of Palladium Nanoclusters

    SciTech Connect (OSTI)

    Ingham, B.; Toney, M.F.; Hendy, S.C.; Cox, T.; Fong, D.D.; Eastman, J.A.; Fuoss, P.H.; Stevens, K.J.; Lassesson, A.; Brown, S.A.; Ryan, M.P.

    2009-05-18

    In situ synchrotron x-ray diffraction experiments on bare palladium nanoclusters prepared by inert-gas aggregation and size selected (1.7-6.0 nm) show significant changes in lattice parameter upon hydrogen loading and a narrowing of the miscibility gap, as the cluster size decreases. The results show that the miscibility gap is open for all cluster sizes studied, in contrast to previous literature results from surfactant-encapsulated palladium clusters. We interpret these results by showing that the nature of the surface is critical in the hydrogenation behavior of the nanoclusters.

  2. Magnetic Nanocrystalline Films Softened by Obliquely Accelerating Iron Nanoclusters

    SciTech Connect (OSTI)

    Meyer, Daniel R.; Faheem, Mohammad; Campanell, Michael; Antony, Jiji; Sharma, Amit M.; Qiang, You

    2007-06-01

    We have generated magnetically ultrasoft thin films composed of iron nanoclusters with diameters of about 20 nm by energetic cluster impact (ECI). The clusters were created in a sputtering-gas-aggregation cluster source with approximately 40% of the particles negatively charged. The charged particles were accelerated onto substrates held at potentials of 0, 5, and 15 kV. The substrates were tilted at an angle of 30 with respect to the incident beam to generate elliptically shaped clusters and thereby induce shape anisotropy. Visible changes of the film structures were observed for increasing potential with the zero potential samples being black due to the porous nature of soft landed clusters. For the 5 and 15 kV samples, the films take on a metallic sheen due to the increased density. The magnetic properties of the films were measured by SQUID at room temperature. Dramatic softening of the films was observed for samples with applied potentials, in good agreement with the random anisotropy model. The coercivity at zero potential was measured to be 78 Oe. Along the easy axis, the coercivities of the 5 and 15 kV samples were 0.50 and 0.65 Oe and 2.06 and 2.46 Oe for the hard axis, respectively. The coercivities for the axis perpendicular to the substrates were 9.86 and 6.70 Oe. In this experiment, we have demonstrated a novel technique for directly controlling film morphology and thereby ability to custom tailor magnetic characteristics.

  3. Optical excitations of metallic nanoclusters buried in TiO2 for solar photochemistry

    E-Print Network [OSTI]

    the absorption of the solar spectrum by through utilizing their plasmon resonances. One challengeOptical excitations of metallic nanoclusters buried in TiO2 for solar photochemistry Fei WangV range, a much better match to the solar spectrum than the 3.8 eV Ag plasmon. AFM measurements indicate

  4. Asymmetric Catalysis at the Mesoscale: Gold Nanoclusters Embedded in Chiral Self-Assembled Monolayer as Heterogeneous

    E-Print Network [OSTI]

    Asymmetric Catalysis at the Mesoscale: Gold Nanoclusters Embedded in Chiral Self of the catalytically active metallic sites and the surrounding chiral SAM for the formation of a mesoscale the catalytically active site from the nanoscale to the mesoscale, which implies a principle of operating systems

  5. Melting and crystallization in Ni nanoclusters: The mesoscale regime Yue Qi and Tahir C agin

    E-Print Network [OSTI]

    Goddard III, William A.

    Melting and crystallization in Ni nanoclusters: The mesoscale regime Yue Qi and Tahir C¸ agin to a mesoscale nanocrystal regime well-defined bulk and surface properties above 750 atoms 2.7 nm . We find that the mesoscale nanocrystals melt via surface processes, leading to Tm,N Tm,bulk N 1/3 , dropping from Tm

  6. Using metal-organic templates to steer the growth of Fe and Co nanoclusters

    E-Print Network [OSTI]

    Brune, Harald

    Using metal-organic templates to steer the growth of Fe and Co nanoclusters R. Decker,1 U nanostructures are created using two-dimensional metal-organic honeycomb lattices as templates. They consist nucleate clusters at specific sites on top of the metal-organic lattices while leaving their hexagonal

  7. In-situ Study of Nanostructure and Electrical Resistance of Nanocluster Films Irradiated with Ion Beams

    SciTech Connect (OSTI)

    Jiang, Weilin; Sundararajan, Jennifer A.; Varga, Tamas; Bowden, Mark E.; Qiang, You; McCloy, John S.; Henager, Charles H.; Montgomery, Robert O.

    2014-08-11

    An in-situ study is reported on the structural evolution in nanocluster films under He+ ion irradiation using an advanced helium ion microscope. The films consist of loosely interconnected nanoclusters of magnetite or iron-magnetite (Fe-Fe3O4) core-shells. The nanostructure is observed to undergo dramatic changes under ion-beam irradiation, featuring grain growth, phase transition, particle aggregation, and formation of nanowire-like network and nano-pores. Studies based on ion irradiation, thermal annealing and election irradiation have indicated that the major structural evolution is activated by elastic nuclear collisions, while both electronic and thermal processes can play a significant role once the evolution starts. The electrical resistance of the Fe-Fe3O4 films measured in situ exhibits a super-exponential decay with dose. The behavior suggests that the nanocluster films possess an intrinsic merit for development of an advanced online monitor for neutron radiation with both high detection sensitivity and long-term applicability, which can enhance safety measures in many nuclear operations.

  8. Melting, freezing, and coalescence of gold nanoclusters Laurent J. Lewis, (a) Pablo Jensen, and JeanLouis Barrat

    E-Print Network [OSTI]

    Lewis, Laurent J.

    Melting, freezing, and coalescence of gold nanoclusters Laurent J. Lewis, (a) Pablo Jensen We present a detailed molecular­dynamics study of the melting, freezing, and coalescence of gold to address two issues. First, we investigate the influence of size on the melting and freezing of gold

  9. Lubricant effect of copper nanoclusters on the dislocation core in -Fe Zhengzheng Chen,1 Nicholas Kioussis,1 Nasr Ghoniem,2 and Tadashi Hasebe3

    E-Print Network [OSTI]

    Ghoniem, Nasr M.

    Lubricant effect of copper nanoclusters on the dislocation core in -Fe Zhengzheng Chen,1 Nicholas lubricant effect in facilitating the shear of atomic rows and the contrasting effects of Cu and Cr

  10. Photonic crystal light emitting diode based on Er and Si nanoclusters co-doped slot waveguide

    SciTech Connect (OSTI)

    Lo Savio, R.; Galli, M.; Liscidini, M.; Andreani, L. C. [Dipartimento di Fisica, Universitŕ di Pavia, Via Bassi 6, 27100 Pavia (Italy); Franzň, G.; Iacona, F.; Miritello, M. [MATIS-IMM CNR and Dipartimento di Fisica e Astronomia, Universitŕ di Catania, via S. Sofia 64, 95123 Catania (Italy); Irrera, A. [CNR-IPCF, Viale Ferdinando Stagno d'Alcontres 37, 98158 Messina (Italy); Sanfilippo, D.; Piana, A. [ST Microelectronics, Stradale Primosole 50, 95121 Catania (Italy); Priolo, F. [MATIS-IMM CNR and Dipartimento di Fisica e Astronomia, Universitŕ di Catania, via S. Sofia 64, 95123 Catania (Italy); Scuola Superiore di Catania, Universitŕ di Catania, Via Valdisavoia 9, 95123 Catania (Italy)

    2014-03-24

    We report on the design, fabrication, and electro-optical characterization of a light emitting device operating at 1.54??m, whose active layer consists of silicon oxide containing Er-doped Si nanoclusters. A photonic crystal (PhC) is fabricated on the top-electrode to enhance the light extraction in the vertical direction, and thus the external efficiency of the device. This occurs if a photonic mode of the PhC slab is resonant with the Er emission energy, as confirmed by theoretical calculations and experimental analyses. We measure an increase of the extraction efficiency by a factor of 3 with a high directionality of light emission in a narrow vertical cone. External quantum efficiency and power efficiency are among the highest reported for this kind of material. These results are important for the realization of CMOS-compatible efficient light emitters at telecom wavelengths.

  11. Magnetic Interaction Reversal In Watermelon Nanostructured Cr-doped Fe Nanoclusters

    SciTech Connect (OSTI)

    Kaur, Maninder; Dai, Qilin; Bowden, Mark E.; Engelhard, Mark H.; Wu, Yaqiao; Tang, Jinke; Qiang, You

    2013-11-11

    Cr-doped core-shell Fe/Fe-oxide nanoclusters (NCs) were synthesized at varied atomic percentages of Cr from 0 at. % to 8 at. %. The low concentrations of Cr (<10 at. %) were selected in order to inhibit the complete conversion of the Fe-oxide shell to Cr2O3 and the Fe core to FeCr alloy. The magnetic interaction in Fe/Fe-oxide NCs (rv25 nm) can be controlled by antiferromagnetic Cr-dopant. We report the origin of r-FeCr phase at very low Cr concentration (2 at. %) unlike in previous studies, and the interaction reversal from dipolar to exchange interaction in watermelon-like Cr-doped core-shell NCs. The giant magnetoresistance (GMR) effect,1,2 where an antiferromagnetic (AFM) exchange coupling exists between two ferromagnetic (FM) layers separated by a certain type of magnetic or non-magnetic spacer,3 has significant potential for application in the magnetic recording industry. Soon after the discovery of the GMR, the magnetic properties of multilayer systems (FeCr) became a subject of intensive study. The application of bulk iron-chromium (Fe-Cr) alloys has been of great interest, as these alloys exhibit favorable prop- erties including corrosion resistance, high strength, hardness, low oxidation rate, and strength retention at elevated temper- ature. However, the structural and magnetic properties of Cr-doped Fe nanoclusters (NCs) have not been investigated in-depth. Of all NCs, Fe-based clusters have unique magnetic properties as well as favorable catalytic characteristics in reactivity, selectivity, and durability.4 The incorporation of dopant of varied type and concentration in Fe can modify its chemical ordering, thereby optimizing its electrical, optical, and magnetic properties and opening up many new applications. The substitution of an Fe atom (1.24 A? ) by a Cr atom (1.25 A? ) can easily modify the magnetic properties, since (i) the curie temperature (Tc ) of Fe is 1043 K, while Cr is an itinerant AFM with a bulk Neel temperature TN =311 K, and (ii) Fe and Cr share the same crystal structure (bcc) with only 0.5% difference between their lattice constants.

  12. Tandem catalysis by palladium nanoclusters encapsulated in metal–organic frameworks

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

    Li, Xinle; Guo, Zhiyong; Xiao, Chaoxian; Goh, Tian Wei; Tesfagaber, Daniel; Huang, Wenyu

    2014-08-25

    A bifunctional Zr-MOF catalyst containing palladium nanoclusters (NCs) has been developed. The formation of Pd NCs was confirmed by transmission electron microscopy (TEM) and extended X-ray absorption fine structure (EXAFS). Combining the oxidation activity of Pd NCs and the acetalization activity of the Lewis acid sites in UiO-66-NH2, this catalyst (Pd@UiO-66-NH2) exhibits excellent catalytic activity and selectivity in a one-pot tandem oxidation-acetalization reaction. This catalyst shows 99.9% selectivity to benzaldehyde ethylene acetal in the tandem reaction of benzyl alcohol and ethylene glycol at 99.9% conversion of benzyl alcohol. We also examined various substituted benzyl alcohols and found that alcohols withmore »electron-donating groups showed better conversion and selectivity compared to those with electron-withdrawing groups. As a result, we further proved that there was no leaching of active catalytic species during the reaction and the catalyst can be recycled at least five times without significant deactivation.« less

  13. Tandem catalysis by palladium nanoclusters encapsulated in metal–organic frameworks

    SciTech Connect (OSTI)

    Li, Xinle; Guo, Zhiyong; Xiao, Chaoxian; Goh, Tian Wei; Tesfagaber, Daniel; Huang, Wenyu

    2014-08-25

    A bifunctional Zr-MOF catalyst containing palladium nanoclusters (NCs) has been developed. The formation of Pd NCs was confirmed by transmission electron microscopy (TEM) and extended X-ray absorption fine structure (EXAFS). Combining the oxidation activity of Pd NCs and the acetalization activity of the Lewis acid sites in UiO-66-NH2, this catalyst (Pd@UiO-66-NH2) exhibits excellent catalytic activity and selectivity in a one-pot tandem oxidation-acetalization reaction. This catalyst shows 99.9% selectivity to benzaldehyde ethylene acetal in the tandem reaction of benzyl alcohol and ethylene glycol at 99.9% conversion of benzyl alcohol. We also examined various substituted benzyl alcohols and found that alcohols with electron-donating groups showed better conversion and selectivity compared to those with electron-withdrawing groups. As a result, we further proved that there was no leaching of active catalytic species during the reaction and the catalyst can be recycled at least five times without significant deactivation.

  14. Oxide Shell Reduction and Magnetic Property Changes in Core-Shell Fe Nanoclusters under Ion Irradiation

    SciTech Connect (OSTI)

    Sundararajan, Jennifer A.; Kaur, Maninder; Jiang, Weilin; McCloy, John S.; Qiang, You

    2014-02-12

    Ion irradiation effects are studied on the Fe-based core-shell nanocluster (NC) films with core as Fe and shell as Fe3O4/FeO. These NC films were were deposited on Si substrates to thickness of ~0.5 micrometers using a NC deposition system. The films were irradiated at room temperature with 5.5 MeV Si2+ ions to ion fluences of 1015 and 1016 ions/cm2. It is found that the irradiation induces grain growth, Fe valence reduction in the shell, and crystallization of Fe3N. The nature and mechanism of oxide shell reduction and composition dependence after irradiation were studied by synthesizing additional NC films of Fe3O4 and FeO+Fe3N and irradiating them under the same conditions. The presence of nanocrystalline Fe is found to be a major factor for the oxide shell reduction. The surface morphologies of these films show dramatic changes in the microstructures due to cluster growth and agglomeration as a result of ion irradiation.

  15. Oxide shell reduction and magnetic property changes in core-shell Fe nanoclusters under ion irradiation

    SciTech Connect (OSTI)

    Sundararajan, Jennifer A.; Kaur, Maninder; Qiang, You, E-mail: youqiang@uidaho.edu [Department of Physics, University of Idaho, Moscow, Idaho 83844 (United States); Jiang, Weilin [Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352 (United States); McCloy, John S. [School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164 (United States)

    2014-05-07

    Ion irradiation effects are studied on the Fe-based core-shell nanocluster (NC) films with core as Fe and shell as Fe{sub 3}O{sub 4}/Fe{sub 3}N. These NC films were deposited on Si substrates to thickness of ?0.5 ?m using a NC deposition system. The films were irradiated at room temperature with 5.5?MeV Si{sup 2+} ions to ion fluences of 10{sup 15} and 10{sup 16} ions/cm{sup 2}. It is found that the irradiation induces grain growth, Fe valence reduction in the shell, and crystallization or growth of Fe{sub 3}N. The film retained its Fe-core and its ferromagnetic properties after irradiation. The nature and mechanism of oxide shell reduction and composition dependence after irradiation were studied by synthesizing additional NC films of Fe{sub 3}O{sub 4} and FeO?+?Fe{sub 3}N and irradiating them under the same conditions. The presence of nanocrystalline Fe is found to be a major factor for the oxide shell reduction. The surface morphologies of these films show dramatic changes in the microstructures due to cluster growth and agglomeration as a result of ion irradiation.

  16. Synthesis of Nearly Uniform Single-Walled Carbon Nanotubes Using Identical Metal-Containing Molecular Nanoclusters as Catalysts

    E-Print Network [OSTI]

    days. The crystals were filtered, washed with ultrapure water, and dried at room temperature demonstrated that the diameters of SWNTs are proportionally related to the sizes of the catalytic nanoparticles temperature before being filtered. The filtrate was kept in an open 250-mL beaker for crystallization for 5

  17. Structure and electronic properties of Cu nanoclusters supported on Mo2C(001) and MoC(001) surfaces

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

    Posada-Pérez, Sergio; Vińes, Francesc; Rodríguez, José A.; Illas, Francesc

    2015-09-15

    In this study, the atomic structure and electronic properties of Cun nanoclusters (n = 4, 6, 7, and 10) supported on cubic nonpolar ?-MoC(001) and orthorhombic C- or Mo-terminated polar ?-Mo2C(001) surfaces have been investigated by means of periodic density functional theory based calculations. The electronic properties have been analyzed by means of the density of states, Bader charges, and electron localization function plots. The Cu nanoparticles supported on ?-Mo2C(001), either Mo- or C-terminated, tend to present a two-dimensional structure whereas a three-dimensional geometry is preferred when supported on ?-MoC(001), indicating that the Mo:C ratio and the surface polarity playmore »a key role determining the structure of supported clusters. Nevertheless, calculations also reveal important differences between the C- and Mo-terminated ?-Mo2C(001) supports to the point that supported Cu particles exhibit different charge states, which opens a way to control the reactivity of these potential catalysts.« less

  18. Thiolate ligands as a double-edged sword for CO oxidation on CeO2-supported Au25(SR)18 nanoclusters

    SciTech Connect (OSTI)

    Wu, Zili [ORNL; Jiang, Deen [ORNL; Mann, Amanda K [ORNL; Mullins, David R [ORNL; Qiao, Zhen-an [University of Tennessee, Knoxville (UTK); Allard Jr, Lawrence Frederick [ORNL; Zeng, Chenjie [Carnegie Mellon University (CMU); Jin, Rongchao [Carnegie Mellon University (CMU); Overbury, Steven {Steve} H [ORNL

    2014-01-01

    The effect of thiolate ligands was explored on the catalysis of CeO2-rod supported Au25(SR)18 (SR = -SCH2-CH2-Ph) by using CO oxidation as a probe reaction. Reaction kinetic tests, in situ IR and X-ray absorption spectroscopy, and density functional theory (DFT) were employed to understand how the thiolate ligands affect the nature of active sites, activation of CO and O2, as well as the reaction mechanism and kinetics. The intact Au25(SR)18 on CeO2-rod is found not able to adsorb CO. Only when the thiolate ligands are partially removed, starting from the interface between Au25(SR)18 and CeO2 at temperatures of 423 K and above, can the adsorption of CO be observed by IR. DFT calculations suggest that CO adsorbs favorably on the exposed gold atoms. Accordingly, the CO oxidation light-off temperature shifts to lower temperature. Several types of Au sites are probed by IR of CO adsorption during the ligand removal process. The cationic Au sites (charged between 0 and +1) are found to play the major role for low temperature CO oxidation. Similar activation energy and reaction rate are found for CO oxidation on differently treated Au25(SR)18/CeO2-rod, suggesting a simple site-blocking effect of the thiolate ligands in Au nanoclusters catalysis. Isotopic labelling experiments clearly indicate that CO oxidation on Au25(SR)18/CeO2-rod proceeds predominantly via the redox mechanism where CeO2 activates O2 while CO is activated on the de-thiolated gold sites. These results points to a double-edged sword role played by the thiolate ligands on Au25 nanoclusters for CO oxidation.

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

    SciTech Connect (OSTI)

    Nieh, T.G.

    2012-07-31

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

  20. Physical response of gold nanoparticles to single self-ion bombardment

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

    Bufford, Daniel C.; Hattar, Khalid

    2014-09-23

    The reliability of nanomaterials depends on maintaining their specific sizes and structures. However, the stability of many nanomaterials in radiation environments remains uncertain due to the lack of a fully developed fundamental understanding of the radiation response on the nanoscale. To provide an insight into the dynamic aspects of single ion effects in nanomaterials, gold nanoparticles (NPs) with nominal diameters of 5, 20, and 60 nm were subjected to self-ion irradiation at energies of 46 keV, 2.8 MeV, and 10 MeV in situ inside of a transmission electron microscope. Ion interactions created a variety of far-from-equilibrium structures including small (~1more »nm) sputtered nanoclusters from the parent NPs of all sizes. Single ions created surface bumps and elongated nanofilaments in the 60 nm NPs. As a result, similar shape changes were observed in the 20 nm NPs, while the 5 nm NPs were transiently melted or explosively broken apart.« less

  1. mathematics single cycle

    E-Print Network [OSTI]

    ?umer, Slobodan

    47 mathematics education single cycle master's study programme #12;48 single cycle master's study program in Mathematics Education #12;49 single cycle master's study program in Mathematics Education MATHEMATICS EDUCATION The program is in tune with the principles of the Bologna Declaration. · Academic title

  2. Generation and reactivity of putative support systems, Ce-Al neutral binary oxide nanoclusters: CO oxidation and C–H bond activation

    SciTech Connect (OSTI)

    Wang, Zhe-Chen; Yin, Shi; Bernstein, Elliot R.

    2013-11-21

    Both ceria (CeO{sub 2}) and alumina (Al{sub 2}O{sub 3}) are very important catalyst support materials. Neutral binary oxide nanoclusters (NBONCs), Ce{sub x}Al{sub y}O{sub z}, are generated and detected in the gas phase and their reactivity with carbon monoxide (CO) and butane (C{sub 4}H{sub 10}) is studied. The very active species CeAlO{sub 4}{sup •} can react with CO and butane via O atom transfer (OAT) and H atom transfer (HAT), respectively. Other Ce{sub x}Al{sub y}O{sub z} NBONCs do not show reactivities toward CO and C{sub 4}H{sub 10}. The structures, as well as the reactivities, of Ce{sub x}Al{sub y}O{sub z} NBONCs are studied theoretically employing density functional theory (DFT) calculations. The ground state CeAlO{sub 4}{sup •} NBONC possesses a kite-shaped structure with an O{sub t}CeO{sub b}O{sub b}AlO{sub t} configuration (O{sub t}, terminal oxygen; O{sub b}, bridging oxygen). An unpaired electron is localized on the O{sub t} atom of the AlO{sub t} moiety rather than the CeO{sub t} moiety: this O{sub t} centered radical moiety plays a very important role for the reactivity of the CeAlO{sub 4}{sup •} NBONC. The reactivities of Ce{sub 2}O{sub 4}, CeAlO{sub 4}{sup •}, and Al{sub 2}O{sub 4} toward CO are compared, emphasizing the importance of a spin-localized terminal oxygen for these reactions. Intramolecular charge distributions do not appear to play a role in the reactivities of these neutral clusters, but could be important for charged isoelectronic BONCs. DFT studies show that the reaction of CeAlO{sub 4}{sup •} with C{sub 4}H{sub 10} to form the CeAlO{sub 4}H•C{sub 4}H{sub 9}{sup •} encounter complex is barrierless. While HAT processes have been previously characterized for cationic and anionic oxide clusters, the reported study is the first observation of a HAT process supported by a ground state neutral oxide cluster. Mechanisms for catalytic oxidation of CO over surfaces of Al{sub x}O{sub y}/M{sub m}O{sub n} or M{sub m}O{sub n}/Al{sub x}O{sub y} materials are proposed consistent with the presented experimental and theoretical results.

  3. Single casing reheat turbine

    SciTech Connect (OSTI)

    Matsushima, Tatsuro; Nishimura, Shigeo

    1999-07-01

    For conventional power plants, regenerative reheat steam turbines have been accepted as the most practical method to meet the demand for efficient and economical power generation. Recently the application of reheat steam turbines for combined cycle power plant began according to the development of large-capacity high temperature gas turbine. The two casing double flow turbine has been applied for this size of reheat steam turbine. The single casing reheat turbine can offer economical and compact power plant. Through development of HP-LP combined rotor and long LP blading series, Mitsubishi Heavy Industries, Ltd. had developed a single casing reheat steam turbine series and began to use it in actual plants. Six units are already in operation and another seven units are under manufacturing. Multiple benefits of single casing reheat turbine are smaller space requirements, shorter construction and erection period, equally good performance, easier operation and maintenance, shorter overhaul period, smaller initial investment, lower transportation expense and so on. Furthermore, single exhaust steam turbine makes possible to apply axial exhaust type, which will lower the height of T/G foundation and T/G housing. The single casing reheat turbine has not only compact and economical configuration itself but also it can reduce the cost of civil construction. In this paper, major developments and design features of the single casing reheat turbine are briefly discussed and operating experience, line-up and technical consideration for performance improvement are presented.

  4. Single Atom Plasmonic Switch

    E-Print Network [OSTI]

    Emboras, Alexandros; Ma, Ping; Haffner, Christian; Luisier, Mathieu; Hafner, Christian; Schimmel, Thomas; Leuthold, Juerg

    2015-01-01

    The atom sets an ultimate scaling limit to Moores law in the electronics industry. And while electronics research already explores atomic scales devices, photonics research still deals with devices at the micrometer scale. Here we demonstrate that photonic scaling-similar to electronics-is only limited by the atom. More precisely, we introduce an electrically controlled single atom plasmonic switch. The switch allows for fast and reproducible switching by means of the relocation of an individual or at most - a few atoms in a plasmonic cavity. Depending on the location of the atom either of two distinct plasmonic cavity resonance states are supported. Experimental results show reversible digital optical switching with an extinction ration of 10 dB and operation at room temperature with femtojoule (fJ) power consumption for a single switch operation. This demonstration of a CMOS compatible, integrated quantum device allowing to control photons at the single-atom level opens intriguing perspectives for a fully i...

  5. Single-exciton nanocrystal laser

    DOE Patents [OSTI]

    Klimov, Victor I. (Los Alamos, NM); Ivanov, Sergei A. (Albuquerque, NM)

    2012-01-17

    A laser system employing amplification via a single exciton regime and to optical gain media having single exciton amplification is provided.

  6. Single crystalline mesoporous silicon nanowires

    E-Print Network [OSTI]

    Hochbaum, A.I.

    2010-01-01

    effects in highly porous crystalline silicon, Nature 1991,J. , Fabrication of single-crystalline silicon nanowires bySingle crystalline mesoporous silicon nanowires Allon I.

  7. Single crystalline mesoporous silicon nanowires

    E-Print Network [OSTI]

    Hochbaum, Allon

    2010-01-01

    Quantum Dots: A General crystalline silicon, Nature 1991,1998, 31, 1927-1949. single-crystalline silicon nanowires byof their facilities. Single crystalline mesoporous silicon

  8. Single rotor turbine engine

    DOE Patents [OSTI]

    Platts, David A. (Los Alamos, NM)

    2002-01-01

    There has been invented a turbine engine with a single rotor which cools the engine, functions as a radial compressor, pushes air through the engine to the ignition point, and acts as an axial turbine for powering the compressor. The invention engine is designed to use a simple scheme of conventional passage shapes to provide both a radial and axial flow pattern through the single rotor, thereby allowing the radial intake air flow to cool the turbine blades and turbine exhaust gases in an axial flow to be used for energy transfer. In an alternative embodiment, an electric generator is incorporated in the engine to specifically adapt the invention for power generation. Magnets are embedded in the exhaust face of the single rotor proximate to a ring of stationary magnetic cores with windings to provide for the generation of electricity. In this alternative embodiment, the turbine is a radial inflow turbine rather than an axial turbine as used in the first embodiment. Radial inflow passages of conventional design are interleaved with radial compressor passages to allow the intake air to cool the turbine blades.

  9. Comment on "Single Crystals of Single-Walled Carbon Nanotubes

    E-Print Network [OSTI]

    Natelson, Douglas

    Comment on "Single Crystals of Single-Walled Carbon Nanotubes Formed by Self-Assembly" Schlittler) by the thermolysis of nano- patterned structures of alternating layers of C60 and nickel. Electron diffraction, high

  10. Measuring single-cell density

    E-Print Network [OSTI]

    Grover, William H.

    We have used a microfluidic mass sensor to measure the density of single living cells. By weighing each cell in two fluids of different densities, our technique measures the single-cell mass, volume, and density of ...

  11. Indistinguishability of independent single photons

    E-Print Network [OSTI]

    F. W. Sun; C. W. Wong

    2009-02-02

    The indistinguishability of independent single photons is presented by decomposing the single photon pulse into the mixed state of different transform limited pulses. The entanglement between single photons and outer environment or other photons induces the distribution of the center frequencies of those transform limited pulses and makes photons distinguishable. Only the single photons with the same transform limited form are indistinguishable. In details, the indistinguishability of single photons from the solid-state quantum emitter and spontaneous parametric down conversion is examined with two-photon Hong-Ou-Mandel interferometer. Moreover, experimental methods to enhance the indistinguishability are discussed, where the usage of spectral filter is highlighted.

  12. Characterization of fundamental catalytic properties of MoS2/WS2 nanotubes and nanoclusters for desulfurization catalysis - a surface temperature study

    SciTech Connect (OSTI)

    U. Burghaus

    2012-07-05

    The prior project consisted of two main project lines. First, characterization of novel nanomaterials for hydrodesulfurization (HDS) applications. Second, studying more traditional model systems for HDS such as vapor-deposited silica-supported Mo and MoSx clusters. In the first subproject, we studied WS2 and MoS2 fullerene-like nanoparticles as well as WS2 nanotubes. Thiophene (C4H4S) was used as the probe molecule. Interestingly, metallic and sulfur-like adsorption sites could be identified on the silica-supported fullerene-particles system. Similar structures are seen for the traditional system (vapor-deposited clusters). Thus, this may be a kinetics fingerprint feature of modern HDS model systems. In addition, kinetics data allowed characterization of the different adsorption sites for thiophene on and inside WS2 nanotube bundles. The latter is a unique feature of nanotubes that has not been reported before for any inorganic nanotube system; however, examples are known for carbon nanotubes, including prior work of the PI. Although HDS has been studied for decades, utilizing nanotubes as nanosized HDS reactors has never been tried before, as far as we know. This is of interest from a fundamental perspective. Unfortunately, the HDS activity of the nanocatalysts at ultra-high vacuum (UHV) conditions was close to the detection limit of our techniques. Therefore, we propose to run experiments at ambient pressure on related nanopowder samples as part of the renewal application utilizing a now-available GC (gas chromatograph) setup. In addition, Ni and Co doped nanocatalyts are proposed for study. These dopants will boost the catalytic activity. In the second subproject of the prior grant, we studied HDS-related chemistry on more traditional supported cluster catalysts. Mo clusters supported by physical vapor deposition (PVD) on silica have been characterized. Two reaction pathways are evident when adsorbing thiophene on Mo and MoSx clusters: molecular adsorption and dissociation. PVD Mo clusters turned out to be very reactive toward thiophene bond activation. Sulfur and carbon residuals form, which poison the catalyst and sulfide the Mo clusters. Sulfided silica-supported MoSx samples are not reactive toward thiophene bond activation. In addition to S and C deposits, H2, H2S, and small organic molecules were detected in the gas phase. Catalyst reactivation procedures, including O2 and atomic hydrogen treatments, have been tested. Cluster size effects have been seen: thiophene adsorbs molecularly with larger binding energies on smaller clusters. However, larger clusters have smaller activation energy for C4H4S bond activation than smaller clusters. The latter is consistent with early catalysis studies. Kinetics and dynamics parameters have been determined quantitatively. We spent a significant amount of time on upgrades of our equipment. A 2nd-hand refurbished X-ray photoelectron spectrometer (XPS) has been integrated into the existing molecular beam scattering system and is already operational (supported by the DoE supplemental grant available in October 2009). We also added a time of flight (TOF) system to the beam scattering apparatus and improved on the accessible impact energy range (new nozzle heater and gas mixing manifold) for the beam scattering experiments. In addition, a GC-based powder atmospheric flow reactor for studies on powder samples is now operational. Furthermore, a 2nd UHV kinetics system has been upgraded as well. In summary, mostly single crystal systems have so far been considered in basic science studies about HDS. Industrial catalysts, however, can be better approximated with the supported cluster systems that we studied in this project. Furthermore, an entirely new class of HDS systems, namely fullerene-like particles and inorganic nanotubes, has been included. Studying new materials and systems has the potential to impact science and technology. The systems investigated are closely related to energy and environmental-related surface science/catalysis. This prior project, conducted at NDSU by a sma

  13. Biomechanics of single cortical neurons

    E-Print Network [OSTI]

    Bernick, Kristin B.

    This study presents experimental results and computational analysis of the large strain dynamic behavior of single neurons in vitro with the objective of formulating a novel quantitative framework for the biomechanics of ...

  14. Single nanoparticle tracking spectroscopic microscope

    DOE Patents [OSTI]

    Yang, Haw (Moraga, CA); Cang, Hu (Berkeley, CA); Xu, Cangshan (Berkeley, CA); Wong, Chung M. (San Gabriel, CA)

    2011-07-19

    A system that can maintain and track the position of a single nanoparticle in three dimensions for a prolonged period has been disclosed. The system allows for continuously imaging the particle to observe any interactions it may have. The system also enables the acquisition of real-time sequential spectroscopic information from the particle. The apparatus holds great promise in performing single molecule spectroscopy and imaging on a non-stationary target.

  15. Single-photon decision maker

    E-Print Network [OSTI]

    Naruse, Makoto; Drezet, Aurelien; Huant, Serge; Aono, Masashi; Hori, Hirokazu; Kim, Song-Ju

    2015-01-01

    Decision making is critical in our daily lives and for society in general and is finding evermore practical applications in information and communication technologies. Herein, we demonstrate experimentally that single photons can be used to make decisions in uncertain, dynamically changing environments. Using a nitrogen-vacancy in a nanodiamond as a single-photon source, we demonstrate the decision-making capability by solving the multi-armed bandit problem. This capability is directly and immediately associated with single-photon detection in the proposed architecture, leading to adequate and adaptive autonomous decision making. This study makes it possible to create systems that benefit from the quantum nature of light to perform practical and vital intelligent functions.

  16. Single-Photon Molecular Cooling

    E-Print Network [OSTI]

    Edvardas Narevicius; S. Travis Bannerman; Mark G. Raizen

    2009-01-04

    We propose a general method to cool the translational motion of molecules. Our method is an extension of single photon atomic cooling which was successfully implemented in our laboratory. Requiring a single event of absorption followed by a spontaneous emission, this method circumvents the need for a cycling transition and can be applied to any paramagnetic or polar molecule. In our approach, trapped molecules would be captured near their classical turning points in an optical dipole or RF-trap following an irreversible transition process.

  17. Single-cycle nonlinear optics

    E-Print Network [OSTI]

    Goulielmakis, E.; Max-Planck-Institut fur Quantenoptik

    2008-01-01

    g l e - C y c l e Nonlinear Optics E. G o u l i e l m a k iSingle-Cycle Nonlinear Optics E. Goulielmakis *, M.D-85748 Garching. Center for X-Ray Optics, Lawrence Berkeley

  18. Single element laser beam shaper

    DOE Patents [OSTI]

    Zhang, Shukui (Yorktown, VA); Michelle D. Shinn (Newport News, VA)

    2005-09-13

    A single lens laser beam shaper for converting laser beams from any spatial profile to a flat-top or uniform spatial profile. The laser beam shaper includes a lens having two aspheric surfaces. The beam shaper significantly simplifies the overall structure in comparison with conventional 2-element systems and therefore provides great ease in alignment and reduction of cost.

  19. A single-molecule approach to ZnO defect studies: Single photons and single defects

    SciTech Connect (OSTI)

    Jungwirth, N. R.; Pai, Y. Y.; Chang, H. S.; MacQuarrie, E. R.; Nguyen, K. X.; Fuchs, G. D.

    2014-07-28

    Investigations that probe defects one at a time offer a unique opportunity to observe properties and dynamics that are washed out of ensemble measurements. Here, we present confocal fluorescence measurements of individual defects in ZnO nanoparticles and sputtered films that are excited with sub-bandgap energy light. Photon correlation measurements yield both antibunching and bunching, indicative of single-photon emission from isolated defects that possess a metastable shelving state. The single-photon emission is in the range of ?560–720?nm and typically exhibits two broad spectral peaks separated by ?150?meV. The excited state lifetimes range from 1 to 13?ns, consistent with the finite-size and surface effects of nanoparticles and small grains. We also observe discrete jumps in the fluorescence intensity between a bright state and a dark state. The dwell times in each state are exponentially distributed and the average dwell time in the bright (dark) state does (may) depend on the power of the exciting laser. Taken together, our measurements demonstrate the utility of a single-molecule approach to semiconductor defect studies and highlight ZnO as a potential host material for single-defect based applications.

  20. Single Top production at CMS

    E-Print Network [OSTI]

    Thomas Speer

    2011-10-11

    A first measurement of the cross section of single top quark production in the t channel in pp collision at sqrt(s)=7 TeV is presented. The measurement is performed on a data sample corresponding to an integrated luminosity of 35.9 pb^-1 recorded at the LHC with the CMS detector. Leptonic decay channels with an electron or a muon in the final state are considered. After a selection optimized for the t-channel mode, two different and complementary analyses have been performed. Both analyses confirm the Tevatron's observation of single top, and their combination measures a cross section of sigma = 83.6 +/- 29.8(stat.+syst.) +/- 3.3 (lumi.) pb, which is consistent with the Standard Model prediction.

  1. SINGLE HEATER TEST FINAL REPORT

    SciTech Connect (OSTI)

    J.B. Cho

    1999-05-01

    The Single Heater Test is the first of the in-situ thermal tests conducted by the U.S. Department of Energy as part of its program of characterizing Yucca Mountain in Nevada as the potential site for a proposed deep geologic repository for the disposal of spent nuclear fuel and high-level nuclear waste. The Site Characterization Plan (DOE 1988) contained an extensive plan of in-situ thermal tests aimed at understanding specific aspects of the response of the local rock-mass around the potential repository to the heat from the radioactive decay of the emplaced waste. With the refocusing of the Site Characterization Plan by the ''Civilian Radioactive Waste Management Program Plan'' (DOE 1994), a consolidated thermal testing program emerged by 1995 as documented in the reports ''In-Situ Thermal Testing Program Strategy'' (DOE 1995) and ''Updated In-Situ Thermal Testing Program Strategy'' (CRWMS M&O 1997a). The concept of the Single Heater Test took shape in the summer of 1995 and detailed planning and design of the test started with the beginning fiscal year 1996. The overall objective of the Single Heater Test was to gain an understanding of the coupled thermal, mechanical, hydrological, and chemical processes that are anticipated to occur in the local rock-mass in the potential repository as a result of heat from radioactive decay of the emplaced waste. This included making a priori predictions of the test results using existing models and subsequently refining or modifying the models, on the basis of comparative and interpretive analyses of the measurements and predictions. A second, no less important, objective was to try out, in a full-scale field setting, the various instruments and equipment to be employed in the future on a much larger, more complex, thermal test of longer duration, such as the Drift Scale Test. This ''shake down'' or trial aspect of the Single Heater Test applied not just to the hardware, but also to the teamwork and cooperation between multiple organizations performing their part in the test.

  2. Photon tunnelling microscopy of polyethylene single crystals

    E-Print Network [OSTI]

    Srinivasarao, Mohan

    Photon tunnelling microscopy of polyethylene single crystals Mohan Srinivasarao* and Richard S:photon tunnellingmicroscopy;single crystals; polyethylene) INTRODUCTION The study of morphology of polymers is an area

  3. Nanoscale Calorimetry of Isolated Polyethylene Single Crystals

    E-Print Network [OSTI]

    Allen, Leslie H.

    Nanoscale Calorimetry of Isolated Polyethylene Single Crystals A. T. KWAN, M. YU. EFREMOV, E. A-film differential scanning calorimetry to investigate the melt- ing of isolated polyethylene single crystals of lamellar single crystals of polyethylene (PE). We obtain thickness, diffraction, and calorimetry data

  4. Ion crystal transducer for strong coupling between single ions and single photons

    E-Print Network [OSTI]

    L. Lamata; D. R. Leibrandt; I. L. Chuang; J. I. Cirac; M. D. Lukin; V. Vuletic; S. F. Yelin

    2011-07-11

    A new approach for realization of a quantum interface between single photons and single ions in an ion crystal is proposed and analyzed. In our approach the coupling between a single photon and a single ion is enhanced via the collective degrees of freedom of the ion crystal. Applications including single-photon generation, a memory for a quantum repeater, and a deterministic photon-photon, photon-phonon, or photon-ion entangler are discussed.

  5. Single-Chain Antibody Library

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Baird, Cheryl

    Researchers at Pacific Northwest National Laboratory (PNNL) have constructed a nonimmune library consisting of 109 human antibody scFv fragments, which have been cloned and expressed on the surface of yeast. Nanomolar-affinity scFvs are routinely obtained by magnetic bead screening and flow cytometric sorting. The yeast library can be amplified 1010 fold without measurable loss of clonal diversity. This allows for indefinite expansion of the library. All scFv clones can be assessed directly on the yeast cell surface by immunofluorescent labeling and flow cytometry, obviating separate subcloning, expression, and purification steps. The ability to use multiplex library screening demonstrates the utility of this approach for high-throughput antibody isolation for proteomic applications. The yeast library may be used for research projects or teaching performed for U.S. Government purposes only. If you would like to request an aliquot of the single-chain antibody library for your research, please print and fill out the Materials Transfer Agreement (MTA) [PDF, 20K]. The website provides the contact information for mailing the MTA. [copied from http://www.sysbio.org/dataresources/singlechain.stm

  6. Characterization of Single Barrier Microrefrigerators at Cryogenic Temperatures

    E-Print Network [OSTI]

    2009-01-01

    at Springerlink.com Characterization of Single Barriercooling) at 100 K. Characterization of Single BarrierThe experimental characterization of single barrier

  7. Optical Precursor of a Single Photon

    SciTech Connect (OSTI)

    Zhang Shanchao; Chen, J. F.; Liu, Chang; Loy, M. M. T.; Wong, G. K. L.; Du, Shengwang [Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon (Hong Kong)

    2011-06-17

    We report the direct observation of optical precursors of heralded single photons with step- and square-modulated wave packets passing through cold atoms. Using electromagnetically induced transparency and the slow-light effect, we separate the single-photon precursor, which always travels at the speed of light in vacuum, from its delayed main wave packet. In the two-level superluminal medium, our result suggests that the causality holds for a single photon.

  8. Press Pass - Press Release - Single top quark

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

    Higgs." Discovering the single top quark production presents challenges similar to the Higgs boson search in the need to extract an extremely small signal from a very large...

  9. Metagenomics, metatranscriptomics and single cell genomics reveal...

    Office of Scientific and Technical Information (OSTI)

    and single cell genomics reveal functional response of active Oceanospirillales to Gulf oil spill Citation Details In-Document Search Title: Metagenomics, metatranscriptomics and...

  10. Banding in single crystals during plastic deformation

    E-Print Network [OSTI]

    Mahesh, Sivasambu

    Banding in single crystals during plastic deformation M. Arul Kumar a Sivasambu Mahesh a,b a. India. Abstract A rigid-plastic rate-independent crystal plasticity model capable of capturing band- ing such as dense dislocation walls. Key words: crystal plasticity, single crystal, macroscopic shear band, regular

  11. Computer Science BSc (Single Honours Degree)

    E-Print Network [OSTI]

    Brierley, Andrew

    72 Computer Science BSc (Single Honours Degree) Computer Science BSc (Joint Honours Degrees) Computer Science and one of: Economics Logic and Philosophy of Science Management Management Science MSci (Single Honours Degree) Computer Science Entry Requirements (see also pages 152-189) The likely grades

  12. Dissecting a Single-Use Film Camera

    E-Print Network [OSTI]

    Zanibbi, Richard

    Dissecting a Single- Use Film Camera RIT Center for Imaging Science #12;WARNING · The single use the BACK of the camera. Leave the front in place. · Remove the AA battery on the left side. You can use this battery in any electronic device that requires a AA battery. BATTERY FILM FILM CANNISTER VIEWFINDER FILM

  13. Ames Lab 101: Single Crystal Growth

    ScienceCinema (OSTI)

    Schlagel, Deborah

    2014-06-04

    Ames Laboratory scientist Deborah Schlagel talks about the Lab's research in growing single crystals of various metals and alloys. The single crystal samples are vital to researchers' understanding of the characteristics of a materials and what gives these materials their particular properties.

  14. State of Connecticut Single Audit Report

    E-Print Network [OSTI]

    Alpay, S. Pamir

    State of Connecticut Single Audit Report For the Fiscal Year Ended June 30, 2014 AUDITORS OF PUBLIC ACCOUNTS JOHN C. GERAGOSIAN ROBERT M. WARD #12;STATE OF CONNECTICUT Single Audit Report For the Year Ended ..................................................................................................1 State of Connecticut Financial Statements Independent Auditors' Report

  15. Single superpartner production at Tevatron Run II

    E-Print Network [OSTI]

    F. Deliot; G. Moreau; C. Royon

    2000-07-25

    We study the single productions of supersymmetric particles at Tevatron Run II which occur in the $2 \\to 2-body$ processes involving R-parity violating couplings of type $\\l'_{ijk} L_i Q_j D_k^c$. We focus on the single gaugino productions which receive contributions from the resonant slepton productions. We first calculate the amplitudes of the single gaugino productions. Then we perform analyses of the single gaugino productions based on the three charged leptons and like sign dilepton signatures. These analyses allow to probe supersymmetric particles masses beyond the present experimental limits, and many of the $\\l'_{ijk}$ coupling constants down to values smaller than the low-energy bounds. Finally, we show that the studies of the single gaugino productions offer the opportunity to reconstruct the $\\tilde \\chi^0_1$, $\\tilde \\chi^{\\pm}_1$, $\\tilde \

  16. Fast recognition of single molecules based on single event photon statistics

    E-Print Network [OSTI]

    Shuangli Dong; Tao Huang; Yuan Liu; Jun Wang; Guofeng Zhang; Liantuan Xiao+; Suotang Jia

    2007-08-02

    Mandel Q-parameter, which is determined from single event photon statistics, provides an alternative to differentiate single-molecule with fluorescence detection. In this work, by using the Q-parameter of the sample fluorescence compared to that of an ideal double-molecule system with the same average photon number, we present a novel and fast approach for identifying single molecules based on single event photon statistics analyses, compared with commonly used two-time correlation measurements. The error estimates for critical values of photon statistics are also presented for single-molecule determination.

  17. Intrinsic chirp of single-cycle pulses

    SciTech Connect (OSTI)

    Lin Qiang; Zheng Jian [Institute of Optics, Department of Physics, Zhejiang University, Hangzhou 310027 (China); Dai Jianming; Ho, I-Chen; Zhang, X.-C. [Center for Terahertz Research, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)

    2010-04-15

    The Fourier transform-limited electromagnetic pulse has been regarded to be free of chirps for a long time. This is no longer true if the pulse duration goes down to or less than one optical cycle. We report the experimental observation of intrinsic chirps in such pulses with the sub-single-cycle terahertz (THz) waveforms obtained with a standard THz time-domain spectroscopy system. The results confirm the break down of the carrier-envelope (CE) expression for single-cycle optical pulses, and may influence the experimental measurements and theoretical modeling with single-cycle pulses.

  18. Single Amplifies Whole Genome Shotgun- Applications

    SciTech Connect (OSTI)

    Pelletier, Eric [Genoscope

    2010-06-04

    Eric Pelletier of Genoscope discusses new sequencing technology developments to study a single cell at a large scale on June 4, 2010 at the "Sequencing, Finishing, Analysis in the Future" meeting in Santa Fe, NM

  19. Asymmetric Architecture for Heralded Single Photon Sources

    E-Print Network [OSTI]

    Luca Mazzarella; Francesco Ticozzi; Alexander V. Sergienko; Giuseppe Vallone; Paolo Villoresi

    2013-02-15

    Single photon source represent a fundamental building block for optical implementations of quantum information tasks ranging from basic tests of quantum physics to quantum communication and high-resolution quantum measurement. In this paper we investigate the performance of a multiplexed system based on asymmetric configuration of multiple heralded single photon sources. {To compare the effectiveness of different designs we introduce a single-photon source performance index that is based on the value of single photon probability required to achieve a guaranteed signal to noise ratio.} The performance and scalability comparison with both currently existing multiple-source architectures and faint laser configurations reveals an advantage the proposed scheme offers in realistic scenarios. This analysis also provides insights on the potential of using such architectures for integrated implementation.

  20. Press Pass - Press Release - Single Top

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

    DZero finds evidence of rare single top quark; Observation marks a step closer to finding Higgs boson Batavia, Ill.--Scientists of the DZero collaboration at the Department of...

  1. Light a Single Candle: Studying Supernovae

    E-Print Network [OSTI]

    O'Leary, Dianne P.

    Light a Single Candle: Studying Supernovae Dianne P. O'Leary Supernovae are exploding stars study, following a paper by Rust, O'Leary, and Mullen (2009), how well the acceleration hypothesis fits

  2. Spin effects in single-electron transistors

    E-Print Network [OSTI]

    Granger, Ghislain

    2005-01-01

    Basic electron transport phenomena observed in single-electron transistors (SETs) are introduced, such as Coulomb-blockade diamonds, inelastic cotunneling thresholds, the spin-1/2 Kondo effect, and Fano interference. With ...

  3. Single mode pulsed dye laser oscillator

    DOE Patents [OSTI]

    Hackel, Richard P. (Livermore, CA)

    1992-01-01

    A single mode pulsed dye laser oscillator is disclosed. The dye laser oscillator provides for improved power efficiency by reducing the physical dimensions of the overall laser cavity, which improves frequency selection capability.

  4. Singles correlation energy contributions in solids

    E-Print Network [OSTI]

    Klimeš, Ji?í; Maggio, Emanuele; Kresse, Georg

    2015-01-01

    The random phase approximation to the correlation energy often yields highly accurate results for condensed matter systems. However, ways how to improve its accuracy are being sought and here we explore the relevance of singles contributions for prototypical solid state systems. We set out with a derivation of the random phase approximation using the adiabatic connection and fluctuation dissipation theorem, but contrary to the most commonly used derivation, the density is allowed to vary along the coupling constant integral. This yields results closely paralleling standard perturbation theory. We re-derive the standard singles of G\\"orling-Levy perturbation theory [G\\"orling and Levy, Phys. Rev. A {\\bf 50}, 196 (1994)], highlight the analogy of our expression to the renormalized singles introduced by Ren and coworkers [Ren, Tkatchenko, Rinke, and Scheffler, Phys. Rev. Lett. {\\bf 106}, 153003 (2011)], and introduce a new approximation for the singles using the density matrix in the random phase approximation. ...

  5. North Shore Gas- Single Family Direct Install

    Broader source: Energy.gov [DOE]

    Owners of single-family homes, condos, townhomes and two-flats may be eligible for a free installation of new programmable thermostats, pipe insulation, showerheads, Compact Fluorescent Bulbs (CFLs...

  6. Single top quark production at D0

    E-Print Network [OSTI]

    Reinhard Schwienhorst; for the D0 collaboration

    2011-09-13

    Updates of electroweak single top quark production measurements by the D0 collaboration are presented using 5.4fb^-1 of proton-antiproton collision data from the Tevatron at Fermilab. Measurements of the t-channel, s-channel and combined single top quark production cross section are presented, including an updated lower limit on the CKM matrix element |V_tb|. Also reported are results from searches for gluon-quark flavor-changing neutral currents and W' boson production.

  7. Single Packaged Vertical Units | 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 RankADVANCED MANUFACTURINGEnergy BillsNo.Hydrogen4 » SearchwithSimulation and High-PerformanceSingleSingle

  8. UV Decontamination of MDA Reagents for Single Cell Genomics

    E-Print Network [OSTI]

    Lee, Janey

    2011-01-01

    Reagents for Single Cell Genomics Janey Lee 1* , Damon TigheReagents for Single Cell Genomics Janey Lee 1 , Damon TigheAbstract Single cell genomics, the amplification and

  9. Detection of single photons by toad and mouse rods

    E-Print Network [OSTI]

    Reingruber, J; Pahlberg, J; Woodruff, ML; Sampath, AP; Fain, GL; Holcman, D

    2013-01-01

    variability of the single photon responses of mammalian rodtime (sec) Fig. 4. Single-photon response for WT mouse0.40. (B) Twenty single-photon response simulations (black)

  10. Exploring patterns in European singles charts

    E-Print Network [OSTI]

    Buda, Andrzej

    2015-01-01

    European singles charts are important part of the music industry responsible for creating popularity of songs. After modeling and exploring dynamics of global album sales in previous papers, we investigate patterns of hit singles popularity according to all data (1966-2015) from weekly charts (polls) in 12 Western European countries. The dynamics of building popularity in various national charts is more than the economy because it depends on spread of information. In our research we have shown how countries may be affected by their neighbourhood and influenced by technological era. We have also computed correlations with geographical and cultural distances between countries in analog, digital and Internet era. We have shown that time delay between the single premiere and the peak of popularity has become shorter under the influence of technology and the popularity of songs depends on geographical distances in analog (1966-1987) and Internet (2004-2015) era. On the other hand, cultural distances between nation...

  11. Review of Methods to Probe Single Cell Metabolism and Bioenergetics...

    Office of Scientific and Technical Information (OSTI)

    recent developments in single cell manipulation, as well as pioneering ones. First, flow-through methods will be discussed, namely methods in which the single cells flow...

  12. Single, Key Gene Discovery Could Streamline Production of Biofuels...

    Energy Savers [EERE]

    Single, Key Gene Discovery Could Streamline Production of Biofuels Single, Key Gene Discovery Could Streamline Production of Biofuels August 11, 2011 - 3:51pm Addthis WASHINGTON,...

  13. Single-valley engineering in graphene superlattices (Journal...

    Office of Scientific and Technical Information (OSTI)

    Single-valley engineering in graphene superlattices This content will become publicly available on June 14, 2016 Prev Next Title: Single-valley engineering in graphene...

  14. Sorted Single-Walled Carbon Nanotube Films for Transparent Electrodes...

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

    Sorted Single-Walled Carbon Nanotube Films for Transparent Electrodes in Organic Solar Cells Home > Research > ANSER Research Highlights > Sorted Single-Walled Carbon Nanotube...

  15. Thermal-hydrologic-mechanical behavior of single fractures in...

    Office of Scientific and Technical Information (OSTI)

    Thermal-hydrologic-mechanical behavior of single fractures in EGS reservoirs Citation Details In-Document Search Title: Thermal-hydrologic-mechanical behavior of single fractures...

  16. Factors Affecting HCCI Combustion Phasing for Fuels with Single...

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

    Affecting HCCI Combustion Phasing for Fuels with Single- and Dual-Stage Chemistry Factors Affecting HCCI Combustion Phasing for Fuels with Single- and Dual-Stage Chemistry 2004...

  17. Valve system incorporating single failure protection logic

    DOE Patents [OSTI]

    Ryan, Rodger (San Jose, CA); Timmerman, Walter J. H. (Saratoga, CA)

    1980-01-01

    A valve system incorporating single failure protective logic. The system consists of a valve combination or composite valve which allows actuation or de-actuation of a device such as a hydraulic cylinder or other mechanism, integral with or separate from the valve assembly, by means of three independent input signals combined in a function commonly known as two-out-of-three logic. Using the input signals as independent and redundant actuation/de-actuation signals, a single signal failure, or failure of the corresponding valve or valve set, will neither prevent the desired action, nor cause the undesired action of the mechanism.

  18. Single-walled carbon nanotube, SWNT(2)

    E-Print Network [OSTI]

    Maruyama, Shigeo

    Technology Roadmap, Journal of the Japan Society of Mechanical Engineers, Vol. 110, No. 1067 (2007). (2 1 c-e 97 % (5) *1 *1 *2 *2 *2 *2 *2 *2 Scattering Process of Transmitted Gas Molecules through process of gas molecules on vertically aligned single-walled carbon nanotube (VA-SWNT) films

  19. Single Cells as Biosensors for Chemical Separations

    E-Print Network [OSTI]

    Single Cells as Biosensors for Chemical Separations Jason B. Shear,* Harvey A. Fishman, Nancy L. Allbritton,t Delia Garigan, Richard N. Zare,t Richard H. Scheller A biosensor system based on the response sensitivity and selectivity. Biosensors detect chemical species with high selectivity on the basis

  20. Static single information form for abstract compilation

    E-Print Network [OSTI]

    Robbiano, Lorenzo

    Static single information form for abstract compilation Davide Ancona and Giovanni Lagorio DIBRIS information (SSI), an extension of SSA proposed in literature and adopted by some compilers, to allow integrated with ab- stract compilation, our approach to static type analysis. In particular, we define

  1. RICE UNIVERSITY Transport in Single Molecule Transistors

    E-Print Network [OSTI]

    Natelson, Douglas

    As the size of a physical system decreases toward the nanoscale, quantum me- chanical effects characteristics that deviate from the simplest model of Kondo physics in single electron devices. We suggest explain the observed deviation. #12;Acknowledgments To begin, I would like to thank my advisor, Professor

  2. Multifrequency, single pass free electron laser

    DOE Patents [OSTI]

    Szoke, Abraham (Fremont, CA); Prosnitz, Donald (Walnut Creek, CA)

    1985-01-01

    A method for simultaneous amplification of laser beams with a sequence of frequencies in a single pass, using a relativistic beam of electrons grouped in a sequence of energies corresponding to the sequence of laser beam frequencies. The method allows electrons to pass from one potential well or "bucket" to another adjacent bucket, thus increasing efficiency of trapping and energy conversion.

  3. 2004 11 -2-(Single-Walled Carbon

    E-Print Network [OSTI]

    Maruyama, Shigeo

    ~~ 2004 11 -2- 1. (Single-Walled Carbon Nanotubes, SWNTs) 13 nm [1] SWNT van Hove [1 SWNT TEM 0.83 nm 2.0 nm SWNT MWNT SWNT 5(a) [11] 5(b) SWNT 1 nm SWNT [12] #12; 2004., Physical Properties of Carbon Nanotubes, Imperial College Press, London, 1998. (2004). [2] S. Maruyama et

  4. Controlling chemical reactions of a single particle

    E-Print Network [OSTI]

    Lothar Ratschbacher; Christoph Zipkes; Carlo Sias; Michael Köhl

    2012-09-26

    The control of chemical reactions is a recurring theme in physics and chemistry. Traditionally, chemical reactions have been investigated by tuning thermodynamic parameters, such as temperature or pressure. More recently, physical methods such as laser or magnetic field control have emerged to provide completely new experimental possibilities, in particular in the realm of cold collisions. The control of reaction pathways is also a critical component to implement molecular quantum information processing. For these undertakings, single particles provide a clean and well-controlled experimental system. Here, we report on the experimental tuning of the exchange reaction rates of a single trapped ion with ultracold neutral atoms by exerting control over both their quantum states. We observe the influence of the hyperfine interaction on chemical reaction rates and branching ratios, and monitor the kinematics of the reaction products. These investigations advance chemistry with single trapped particles towards achieving quantum-limited control of chemical reactions and indicate limits for buffer gas cooling of single ion clocks.

  5. A Diamond Nanowire Single Photon Antenna

    E-Print Network [OSTI]

    Tom Babinec; Birgit J. M. Hausmann; Mughees Khan; Yinan Zhang; Jero Maze; Philip R. Hemmer; Marko Loncar

    2009-10-28

    The development of a robust light source that emits one photon at a time is an outstanding challenge in quantum science and technology. Here, at the transition from many to single photon optical communication systems, fully quantum mechanical effects may be utilized to achieve new capabilities, most notably perfectly secure communication via quantum cryptography. Practical implementations place stringent requirements on the device properties, including stable photon generation, room temperature operation, and efficient extraction of many photons. Single photon light emitting devices based on fluorescent dye molecules, quantum dots, and carbon nanotube material systems have all been explored, but none have simultaneously demonstrated all criteria. Here, we describe the design, fabrication, and characterization of a bright source of single photons consisting of an individual Nitrogen-vacancy color center (NV center) in a diamond nanowire operating in ambient conditions. The nanowire plays a positive role in increasing the number of single photons collected from the NV center by an order of magnitude over devices based on bulk diamond crystals, and allows operation at an order of magnitude lower power levels. This result enables a new class of nanostructured diamond devices for room temperature photonic and quantum information processing applications, and will also impact fields as diverse as biological and chemical sensing, opto-mechanics, and scanning-probe microscopy.

  6. SINGLE AND MULTIPLE ANTENNA COMMUNICATION SYSTEMS: PERFORMANCE

    E-Print Network [OSTI]

    Wehlau, David

    ), the Ontario Premier's Research Excellence Award (PREA), the Department of Electrical and Computer EngineeringSINGLE AND MULTIPLE ANTENNA COMMUNICATION SYSTEMS: PERFORMANCE ANALYSIS AND JOINT SOURCE-CHANNEL CODING by Firouz Behnamfar A thesis submitted to the Department of Electrical and Computer Engineering

  7. Nano-soldering to single atomic layer

    DOE Patents [OSTI]

    Girit, Caglar O. (Berkeley, CA); Zettl, Alexander K. (Kensington, CA)

    2011-10-11

    A simple technique to solder submicron sized, ohmic contacts to nanostructures has been disclosed. The technique has several advantages over standard electron beam lithography methods, which are complex, costly, and can contaminate samples. To demonstrate the soldering technique graphene, a single atomic layer of carbon, has been contacted, and low- and high-field electronic transport properties have been measured.

  8. Sisl: Several Interfaces, Single Logic Thomas Ballz

    E-Print Network [OSTI]

    Läufer, Konstantin

    Sisl: Several Interfaces, Single Logic Thomas Ballz Christopher Colby+ Peter Danielseny Lalita such as information and e-commerce services are becoming increasingly more flexible in the types of user interfaces they support. These interfaces incorporate automatic speech recognition and natural language understanding

  9. Preparation and Characterization of Single-Atom Tips

    E-Print Network [OSTI]

    reproducible method of preparing single-atom tips by electroplating Pd or Pt on single-crystal W(111) tips method with electroplating a Pd (or Pt) film on the single-crystal W(111) tip is proposed. Electroplating single- crystal wire of 0.35 mm in diameter by electrochemical etching15 followed by coating with ethyl

  10. Nonclassical Radiation from a Single Quantum Dot P. Michler1

    E-Print Network [OSTI]

    Buratto, Steve

    Nonclassical Radiation from a Single Quantum Dot P. Michler1 ) (a, b), A. Imamoglu (a), A. Kiraz (a nature of radiation and provides direct evi- dence that the emission source is a single two-level quantum of a single atom in an atomic beam [1] and from a single ion which has been stored in a radiofrequency trap [2

  11. Tapered fiber coupling of single photons emitted by a deterministically positioned single nitrogen vacancy center

    SciTech Connect (OSTI)

    Liebermeister, Lars Petersen, Fabian; Münchow, Asmus v.; Burchardt, Daniel; Hermelbracht, Juliane; Tashima, Toshiyuki; Schell, Andreas W.; Benson, Oliver; Meinhardt, Thomas; Krueger, Anke; Stiebeiner, Ariane; Rauschenbeutel, Arno; Weinfurter, Harald; Weber, Markus

    2014-01-20

    A diamond nano-crystal hosting a single nitrogen vacancy (NV) center is optically selected with a confocal scanning microscope and positioned deterministically onto the subwavelength-diameter waist of a tapered optical fiber (TOF) with the help of an atomic force microscope. Based on this nano-manipulation technique, we experimentally demonstrate the evanescent coupling of single fluorescence photons emitted by a single NV-center to the guided mode of the TOF. By comparing photon count rates of the fiber-guided and the free-space modes and with the help of numerical finite-difference time domain simulations, we determine a lower and upper bound for the coupling efficiency of (9.5?±?0.6)% and (10.4?±?0.7)%, respectively. Our results are a promising starting point for future integration of single photon sources into photonic quantum networks and applications in quantum information science.

  12. Nanoscale optical positioning of single quantum dots for bright and pure single-photon emission

    E-Print Network [OSTI]

    Luca Sapienza; Marcelo Davanco; Antonio Badolato; Kartik Srinivasan

    2015-08-05

    Self-assembled, epitaxially-grown InAs/GaAs quantum dots are promising semiconductor quantum emitters that can be integrated on a chip for a variety of photonic quantum information science applications. However, self-assembled growth results in an essentially random in-plane spatial distribution of quantum dots, presenting a challenge in creating devices that exploit the strong interaction of single quantum dots with highly confined optical modes. Here, we present a photoluminescence imaging approach for locating single quantum dots with respect to alignment features with an average position uncertainty technology for the creation of optimized single quantum dot devices. To that end, we create quantum dot single-photon sources, based on a circular Bragg grating geometry, that simultaneously exhibit high collection efficiency (48 % +/- 5 % into a 0.4 numerical aperture lens, close to the theoretically predicted value of 50 %), low multiphoton probability (g(2)(0) <1 %), and a significant Purcell enhancement factor (~ 3).

  13. Single chain elasticity and thermoelasticity of polyethylene

    E-Print Network [OSTI]

    John T. Titantah; Carlo Pierleoni; Jean-Paul Ryckaert

    2002-09-05

    Single-chain elasticity of polyethylene at $\\theta$ point up to 90% of stretching with respect to its contour length is computed by Monte-Carlo simulation of an atomistic model in continuous space. The elasticity law together with the free-energy and the internal energy variations with stretching are found to be very well represented by the wormlike chain model up to 65% of the chain elongation, provided the persistence length is treated as a temperature dependent parameter. Beyond this value of elongation simple ideal chain models are not able to describe the Monte Carlo data in a thermodynamic consistent way. This study reinforces the use of the wormlike chain model to interpret experimental data on the elasticity of synthetic polymers in the finite extensibility regime, provided the chain is not yet in its fully stretched regime. Specific solvent effects on the elasticity law and the partition between energetic and entropic contributions to single chain elasticity are investigated.

  14. Annealing of single lamella nanoparticles of polyethylene

    E-Print Network [OSTI]

    Christophe N. Rochette; Sabine Rosenfeldt; Katja Henzler; Frank Polzer; Matthias Ballauff; Qiong Tong; Stefan Mecking; Markus Drechsler; Theyencheri Narayanan; Ludger Harnau

    2011-07-05

    We study the change of the size and structure of freely suspended single lamella nanoparticles of polyethylene during thermal annealing in aqueous solutions. Using small-angle x-ray scattering and cryogenic transmission electron microscopy, it is shown that a doubling of the crystalline lamella sandwiched between two amorphous polymer layers is obtained by annealing the nanoparticles at 125 C. This thickening of the crystalline lamella can be understood in terms of an unlooping of polymer chains within a single nanoparticle. In addition a variation of the annealing temperature from 90 C to 115 C demonstrates that the inverse of the crystalline lamellar thickness increases linearly with the annealing temperatures leading to a recrystallization line in a Gibbs-Thomson graph. Since the nanoparticles consist of about only eight polymer chains, they can be considered as a ideal candidates for the experimental realization of equilibrium polymer crystals.

  15. Automated imaging system for single molecules

    DOE Patents [OSTI]

    Schwartz, David Charles; Runnheim, Rodney; Forrest, Daniel

    2012-09-18

    There is provided a high throughput automated single molecule image collection and processing system that requires minimal initial user input. The unique features embodied in the present disclosure allow automated collection and initial processing of optical images of single molecules and their assemblies. Correct focus may be automatically maintained while images are collected. Uneven illumination in fluorescence microscopy is accounted for, and an overall robust imaging operation is provided yielding individual images prepared for further processing in external systems. Embodiments described herein are useful in studies of any macromolecules such as DNA, RNA, peptides and proteins. The automated image collection and processing system and method of same may be implemented and deployed over a computer network, and may be ergonomically optimized to facilitate user interaction.

  16. Single transmission line data acquisition system

    DOE Patents [OSTI]

    Fasching, George E. (Morgantown, WV)

    1984-01-01

    A single transmission line interrogated multiple channel data acquisition system is provided in which a plurality of remote station/sensors monitor specific process variables and transmit measurement values over the single transmission line to a master station when addressed by the master station. Power for all remote stations (up to 980) is provided by driving the line with constant voltage supplied from the master station and automatically maintained independent of the number of remote stations directly connected to the line. The transmission line can be an RG-62 coaxial cable with lengths up to about 10,000 feet with branches up to 500 feet. The remote stations can be attached randomly along the line. The remote stations can be scanned at rates up to 980 channels/second.

  17. Ultrasonic characterization of single drops of liquids

    DOE Patents [OSTI]

    Sinha, Dipen N. (Los Alamos, NM)

    1998-01-01

    Ultrasonic characterization of single drops of liquids. The present invention includes the use of two closely spaced transducers, or one transducer and a closely spaced reflector plate, to form an interferometer suitable for ultrasonic characterization of droplet-size and smaller samples without the need for a container. The droplet is held between the interferometer elements, whose distance apart may be adjusted, by surface tension. The surfaces of the interferometer elements may be readily cleansed by a stream of solvent followed by purified air when it is desired to change samples. A single drop of liquid is sufficient for high-quality measurement. Examples of samples which may be investigated using the apparatus and method of the present invention include biological specimens (tear drops; blood and other body fluid samples; samples from tumors, tissues, and organs; secretions from tissues and organs; snake and bee venom, etc.) for diagnostic evaluation, samples in forensic investigations, and detection of drugs in small quantities.

  18. A single-atom heat engine

    E-Print Network [OSTI]

    Roßnagel, Johannes; Tolazzi, Karl Nicolas; Abah, Obinna; Lutz, Eric; Schmidt-Kaler, Ferdinand; Singer, Kilian

    2015-01-01

    We report the experimental realization of a single-atom heat engine. An ion is confined in a linear Paul trap with tapered geometry and driven thermally by coupling it alternately to hot and cold reservoirs. The output power of the engine is used to drive a harmonic oscillation. From direct measurements of the ion dynamics, we determine the thermodynamic cycles for various temperature differences of the reservoirs. We use these cycles to evaluate power $P$ and efficiency $\\eta$ of the engine, obtaining up to $P=342\\,$yJ and $\\eta=0.28 \\,\\%$, consistent with analytical estimations. Our results demonstrate that thermal machines can be reduced to the ultimate limit of single atoms.

  19. A single-atom heat engine

    E-Print Network [OSTI]

    Johannes Roßnagel; Samuel Thomas Dawkins; Karl Nicolas Tolazzi; Obinna Abah; Eric Lutz; Ferdinand Schmidt-Kaler; Kilian Singer

    2015-10-13

    We report the experimental realization of a single-atom heat engine. An ion is confined in a linear Paul trap with tapered geometry and driven thermally by coupling it alternately to hot and cold reservoirs. The output power of the engine is used to drive a harmonic oscillation. From direct measurements of the ion dynamics, we determine the thermodynamic cycles for various temperature differences of the reservoirs. We use these cycles to evaluate power $P$ and efficiency $\\eta$ of the engine, obtaining up to $P=342\\,$yJ and $\\eta=0.28 \\,\\%$, consistent with analytical estimations. Our results demonstrate that thermal machines can be reduced to the ultimate limit of single atoms.

  20. Neutron detection with single crystal organic scintillators

    SciTech Connect (OSTI)

    Zaitseva, N; Newby, J; Hamel, S; Carman, L; Faust, M; Lordi, V; Cherepy, N; Stoeffl, W; Payne, S

    2009-07-15

    Detection of high-energy neutrons in the presence of gamma radiation background utilizes pulse-shape discrimination (PSD) phenomena in organics studied previously only with limited number of materials, mostly liquid scintillators and single crystal stilbene. The current paper presents the results obtained with broader varieties of luminescent organic single crystals. The studies involve experimental tools of crystal growth and material characterization in combination with the advanced computer modeling, with the final goal of better understanding the relevance between the nature of the organic materials and their PSD properties. Special consideration is given to the factors that may diminish or even completely obscure the PSD properties in scintillating crystals. Among such factors are molecular and crystallographic structures that determine exchange coupling and exciton mobility in organic materials and the impurity effect discussed on the examples of trans-stilbene, bibenzyl, 9,10-diphenylanthracene and diphenylacetylene.

  1. Method for preparation of single chain antibodies

    DOE Patents [OSTI]

    Cheung, Nai-Kong V. (New York, NY); Guo, Hong-fen (New York, NY)

    2012-04-03

    This invention provides a method for identifying cells expressing a target single chain antibody (scFv) directed against a target antigen from a collection of cells that includes cells that do not express the target scFv, comprising the step of combining the collection of cells with an anti-idiotype directed to an antibody specific for the target antigen and detecting interaction, if any, of the anti-idiotype with the cells, wherein the occurrence of an interaction identifies the cell as one which expresses the target scFv. This invention also provides a method for making a single chain antibody (scFv) directed against an antigen, wherein the selection of clones is made based upon interaction of those clones with an appropriate anti-idiotype, and heretofore inaccessible scFv so made. This invention provides the above methods or any combination thereof. Finally, this invention provides various uses of these methods.

  2. Magnetotransport of single crystalline NbAs

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

    Ghimire, N. J.; Luo, Yongkang; Neupane, M.; Williams, D. J.; Bauer, E. D.; Ronning, F.

    2015-03-27

    We report transport measurement in zero and applied magnetic field on a single crystal of NbAs. Transverse and longitudinal magnetoresistance in the plane of this tetragonal structure does not saturate up to 9 T. In the transverse configuration (H ? c, I ? c) it is 230,000% at 2 K. The Hall coefficient changes sign from hole-like at room temperature to electron-like below ~150 K. The electron carrier density and mobility calculated at 2 K based on a single band approximation are 1.8 × 1019 cm-3 and 3.5 × 105 cm2/Vs, respectively. These values are similar to reported values formore »TaAs and NbP, and further emphasize that this class of noncentrosymmetric, transition-metal monopnictides is a promising family to explore the properties of Weyl semimetals and the consequences of their novel electronic structure.« less

  3. Single-transistor-clocked flip-flop

    DOE Patents [OSTI]

    Zhao, Peiyi; Darwish, Tarek; Bayoumi, Magdy

    2005-08-30

    The invention provides a low power, high performance flip-flop. The flip-flop uses only one clocked transistor. The single clocked transistor is shared by the first and second branches of the device. A pulse generator produces a clock pulse to trigger the flip-flop. In one preferred embodiment the device can be made as a static explicit pulsed flip-flop which employs only two clocked transistors.

  4. Efficiency limits for linear optical processing of single photons and single-rail qubits

    E-Print Network [OSTI]

    Dominic W. Berry; A. I. Lvovsky; Barry C. Sanders

    2006-05-03

    We analyze the problem of increasing the efficiency of single-photon sources or single-rail photonic qubits via linear optical processing and destructive conditional measurements. In contrast to previous work we allow for the use of coherent states and do not limit to photon-counting measurements. We conjecture that it is not possible to increase the efficiency, prove this conjecture for several important special cases, and provide extensive numerical results for the general case.

  5. Dual echelon femtosecond single-shot spectroscopy

    SciTech Connect (OSTI)

    Shin, Taeho; Wolfson, Johanna W.; Teitelbaum, Samuel W.; Kandyla, Maria; Nelson, Keith A.

    2014-08-15

    We have developed a femtosecond single-shot spectroscopic technique to measure irreversible changes in condensed phase materials in real time. Crossed echelons generate a two-dimensional array of time-delayed pulses with one femtosecond probe pulse. This yields 9 ps of time-resolved data from a single laser shot, filling a gap in currently employed measurement methods. We can now monitor ultrafast irreversible dynamics in solid-state materials or other samples that cannot be flowed or replenished between laser shots, circumventing limitations of conventional pump-probe methods due to sample damage or product buildup. Despite the absence of signal-averaging in the single-shot measurement, an acceptable signal-to-noise level has been achieved via background and reference calibration procedures. Pump-induced changes in relative reflectivity as small as 0.2%?0.5% are demonstrated in semimetals, with both electronic and coherent phonon dynamics revealed by the data. The optical arrangement and the space-to-time conversion and calibration procedures necessary to achieve this level of operation are described. Sources of noise and approaches for dealing with them are discussed.

  6. Hanford Site single-shell tank roadmap

    SciTech Connect (OSTI)

    Not Available

    1991-04-01

    The Hanford Site Single-Shell Tank Roadmap covers the near-term waste management activities to ensure safe interim storage of 140 million liters of waste. It also addresses the environmental restoration activities to close the 6 single-shell tank operable units, which include 149 single-shell tanks. These tanks were constructed starting in the 1940`s. Sixty-six tanks have leaked or are assumed to be leaking. This Roadmap has highlighted the need for integrated planning and resource allocation. The June 1990 Five-Year Plan did not address the tank safety concerns that evolved since its publication. Potential impacts to Tri-Party Agreement milestones for characterization, stabilization and isolation, technology development/demonstration, and closure will be examined in greater detail to strengthen the technical decision basis and to minimize consequences. The Roadmap indicates the advantage of accelerating characterization programs, technology evaluations, and supplemental environmental impact statement preparation. Working with regulators and expanded public outreach programs are essential to successful completion of this activity.

  7. Optimization of the LCLS Single Pulse Shutter

    SciTech Connect (OSTI)

    Adera, Solomon; /Georgia Tech., Atlanta /SLAC

    2010-08-25

    A mechanical shutter which operates on demand is used to isolate a single pulse from a 120 Hz X-ray source. This is accomplished with a mechanical shutter which is triggered on demand with frequencies ranging from 0 to 10 Hz. The single pulse shutter is an iron blade that oscillates on a pivot in response to a force generated by a pair of pulsed electromagnets (current driven teeter-totter). To isolate an individual pulse from the X-ray beam, the motion of the mechanical shutter should be synchronized in such a way that it allows a single pulse to pass through the aperture and blocks the other incoming pulses. Two consecutive pulses are only {approx} 8 ms apart and the shutter is required to complete one full cycle such that no two pulses pass through the opening. Also the opening of the shutter blade needs to be at least 4 mm so that a 1 mm diameter rms Gaussian beam can pass through without modulation. However, the 4 mm opening is difficult to obtain due to blade rebound and oscillation of the blade after colliding with the electromagnet. The purpose of this project is to minimize and/or totally eliminate the rebound of the shutter blade in pursuit of maximizing the aperture while keeping the open window interval < {approx}12 ms.

  8. A Goldilocks Catalyst: Nanocluster 'just right' for Recycling...

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

    Carbon dioxide (CO2) emissions from fossil fuel combustion are major contributors to global warming. Since CO2 comes from fuel, why can't we recycle it back into fuel rather...

  9. Fano Resonances in Plasmonic Nanoclusters: Geometrical and Chemical...

    Office of Scientific and Technical Information (OSTI)

    77 NANOSCIENCE AND NANOTECHNOLOGY solar (photovoltaic), solar (fuels), solid state lighting, bio-inspired, electrodes - solar, defects, charge transport, materials and chemistry...

  10. MELTING, FREEZING, DIFFUSION, AND COALESCENCE OF GOLD NANOCLUSTERS

    E-Print Network [OSTI]

    Lewis, Laurent J.

    'epartement de physique et GCM, Universit'e de Montr'eal, C.P. 6128, Succursale Centre­ Ville, Montr'eal, Qu. These materials can be grown by the low­energy deposition of preformed clusters containing hundreds or thousands

  11. Supporting information for: Asymmetric catalysis at the mesoscale: Gold nanoclusters

    E-Print Network [OSTI]

    . Immobilization of quinine 3 on MCF-17: 1. Propargylation of quinine: 250 mg of quinine were dissolved in 2.5 m

  12. Study of Impurity-Helium Condensates Formed by Multishell Nanoclusters 

    E-Print Network [OSTI]

    Mao, Shun

    2014-12-17

    . Impurity-helium condensates (IHCs) containing nitrogen and krypton atoms immersed in super fluid 4He have been studied via a CW electron spin resonance (ESR) technique. It was found that the addition of krypton atoms to the nitrogen-helium gas mixture used...

  13. Site-Selective Ionization in Nanoclusters Affects Subsequent Fragmentation

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effect Photovoltaics -7541 UnlimitedShiftwater vaporRisks: ď‚· Radiation -Site5

  14. Site-Selective Ionization in Nanoclusters Affects Subsequent Fragmentation

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effect Photovoltaics -7541 UnlimitedShiftwater vaporRisks: ď‚· Radiation

  15. Site-Selective Ionization in Nanoclusters Affects Subsequent Fragmentation

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effect Photovoltaics -7541 UnlimitedShiftwater vaporRisks: ď‚·

  16. Site-Selective Ionization in Nanoclusters Affects Subsequent Fragmentation

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effect Photovoltaics -7541 UnlimitedShiftwater vaporRisks: ď‚·Site-Selective

  17. Site-Selective Ionization in Nanoclusters Affects Subsequent Fragmentation

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effect Photovoltaics -7541 UnlimitedShiftwater vaporRisks:

  18. Fano Resonances in Plasmonic Nanoclusters: Geometrical and Chemical

    Office of Scientific and Technical Information (OSTI)

    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 Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article) |production at a linear(Conference)membranes by(Conference)Tunability

  19. The Evolution in Pu Nanocluster Electronic Structure: from Atomicity to

    Office of Scientific and Technical Information (OSTI)

    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 Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail. (Conference)FeedbackProperties of Graphene (Journal Article)(Conference) |

  20. The Evolution in Pu Nanocluster Electronic Structure: from Atomicity to

    Office of Scientific and Technical Information (OSTI)

    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 Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail. (Conference)FeedbackProperties of Graphene (Journal Article)(Conference) |Three

  1. Los Alamos explores hybrid ultrasmall gold nanocluster for enzymatic fuel

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformationJesse BergkampCentermillion to local Unitedto STEMLANL conductsLosLoscells

  2. Site-Selective Ionization in Nanoclusters Affects Subsequent Fragmentation

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation ofAlbuquerque|Sensitive Species3 Outlook forSimulationsSite MapSite-Selective

  3. Site-Selective Ionization in Nanoclusters Affects Subsequent Fragmentation

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation ofAlbuquerque|Sensitive Species3 Outlook forSimulationsSite

  4. Neutron single target spin asymmetries in SIDIS

    SciTech Connect (OSTI)

    Evaristo Cisbani

    2010-04-01

    The experiment E06-010 in Hall A at Jefferson Lab took data between November 2008 and February 2009 to directly measure, for the first time, the pion (and kaon) single "neutron" target-spin asymmetry (SSA) in semi-inclusive DIS from a polarized 3He target. Collins, Sivers (and Pretzelosity) neutron asymmetries are going to be extracted from the measured SSA. Details of the experiment are described together with the preliminary results of the ongoing analysis. Near future Hall A experiments on transverse nucleon spin structure are shorty reviewed.

  5. Transient Rayleigh scattering from single semiconductor nanowires

    SciTech Connect (OSTI)

    Montazeri, Mohammad; Jackson, Howard E.; Smith, Leigh M.; Yarrison-Rice, Jan M.; Kang, Jung-Hyun; Gao, Qiang; Tan, Hark Hoe; Jagadish, Chennupati

    2013-12-04

    Transient Rayleigh scattering spectroscopy is a new pump-probe technique to study the dynamics and cooling of photo-excited carriers in single semiconductor nanowires. By studying the evolution of the transient Rayleigh spectrum in time after excitation, one can measure the time evolution of the density and temperature of photo-excited electron-hole plasma (EHP) as they equilibrate with lattice. This provides detailed information of dynamics and cooling of carriers including linear and bimolecular recombination properties, carrier transport characteristics, and the energy-loss rate of hot electron-hole plasma through the emission of LO and acoustic phonons.

  6. Single top and top pair production

    E-Print Network [OSTI]

    Nikolaos Kidonakis

    2012-12-12

    I present results for single-top and top-pair production at the LHC and the Tevatron. Higher-order two-loop corrections are used to achieve NNLL resummation, which is then used to derive NNLO soft-gluon corrections. Results are presented for total cross sections, top transverse momentum distributions, and top rapidity distributions. All results are in excellent agreement with data from the LHC and the Tevatron. I also clarify the differences between various methods in top-pair production and their relation to exact NNLO results.

  7. Controlled synthesis of single-crystalline graphene

    SciTech Connect (OSTI)

    Xueshen, Wang, E-mail: wangxs@nim.ac.cn; Jinjin, Li, E-mail: jinjinli@nim.ac.cn; Qing, Zhong; Yuan, Zhong; Mengke, Zhao; Yonggang, Liu [National Institute of Metrology, Beijing, China, 100013 (China)] [National Institute of Metrology, Beijing, China, 100013 (China)

    2014-03-15

    This paper reports the controlled synthesis of single-crystalline graphene on the back side of copper foil using CH{sub 4} as the precursor. The influence of growth time and the pressure ratio of CH{sub 4}/H{sub 2} on the structure of graphene are examined. An optimized polymer-assisted method is used to transfer the synthesized graphene onto a SiO{sub 2}/Si substrate. Scanning electron microscopy and Raman spectroscopy are used to characterize the graphene.

  8. Superconducting nanowire single photon detector on diamond

    SciTech Connect (OSTI)

    Atikian, Haig A.; Burek, Michael J.; Choy, Jennifer T.; Lon?ar, Marko; Eftekharian, Amin; Jafari Salim, A.; Hamed Majedi, A.

    2014-03-24

    Superconducting nanowire single photon detectors are fabricated directly on diamond substrates and their optical and electrical properties are characterized. Dark count performance and photon count rates are measured at varying temperatures for 1310?nm and 632?nm photons. A multi-step diamond surface polishing procedure is reported, involving iterative reactive ion etching and mechanical polishing to create a suitable diamond surface for the deposition and patterning of thin film superconducting layers. Using this approach, diamond substrates with less than 300?pm Root Mean Square surface roughness are obtained.

  9. A single power supply optoelectronic differential amplifier 

    E-Print Network [OSTI]

    Choi, Youngmin Albert

    1987-01-01

    -optical characteristics. They are employed as transmitters in optical sys- tems because of their compactness and their high level of efficiency which make them superior to light emitting diodes. Laser Operation[8] IVhen a bias voltage is applied in the forward... an electrical input signal to an optical signal is also discussed. In the last section, a novel single power supply receiver circuit is described and analyzed. A, Laser Diode (LD) Laser diodes are semiconductor p-n junction devices that emit coherent radi...

  10. Nonlinear Seismic Response Of Single Piles

    SciTech Connect (OSTI)

    Cairo, R.; Conte, E.; Dente, G.

    2008-07-08

    In this paper, a method is proposed to analyse the seismic response of single piles under nonlinear soil condition. It is based on the Winkler foundation model formulated in the time domain, which makes use of p-y curves described by the Ramberg-Osgood relationship. The analyses are performed referring to a pile embedded in two-layer soil profiles with different sharp stiffness contrast. Italian seismic records are used as input motion. The calculated bending moments in the pile are compared to those obtained using other theoretical solutions.

  11. Quantum thermal machines with single nonequilibrium environments

    E-Print Network [OSTI]

    Bruno Leggio; Bruno Bellomo; Mauro Antezza

    2015-01-08

    We propose a scheme for a quantum thermal machine made by atoms interacting with a single non-equilibrium electromagnetic field. The field is produced by a simple configuration of macroscopic objects held at thermal equilibrium at different temperatures. We show that these machines can deliver all thermodynamic tasks (cooling, heating and population inversion), and this by establishing quantum coherence with the body on which they act. Remarkably, this system allows to reach efficiencies at maximum power very close to the Carnot limit, much more than in existing models. Our findings offer a new paradigm for efficient quantum energy flux management, and can be relevant for both experimental and technological purposes.

  12. Maxwell's Demon Based on a Single Qubit

    E-Print Network [OSTI]

    J. P. Pekola; D. S. Golubev; D. V. Averin

    2015-11-02

    We propose and analyze Maxwell's demon based on a single qubit with avoided level crossing. Its operation cycle consists of adiabatic drive to the point of minimum energy separation, measurement of the qubit state, and conditional feedback. We show that the heat extracted from the bath at temperature $T$ can ideally approach the Landauer limit of $k_BT\\ln 2$ per cycle even in the quantum regime. Practical demon efficiency is limited by the interplay of Landau-Zener transitions and coupling to the bath. We suggest that an experimental demonstration of the demon is fully feasible using one of the standard superconducting qubits.

  13. Single Top Production at the Tevatron

    E-Print Network [OSTI]

    A. Gresele

    2006-05-13

    We report on a search for Standard Model t-channel ans s-channel single top quark production in p-pbar collisions at a center of mass energy of 1.96 TeV. We use a data sample corresponding to 0.7 fb-1 recorded by the upgraded Collider Detector at Fermilab (CDFII) and a data sample corresponding to 370 pb-1 recorded by D0. Both CDF and D0 find no significant evidence for electroweak top quark production and set upper limits at the 95 % confidence level on the production cross section

  14. Pseudo-Single-Bunch Expands Experimental Scope

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass mapSpeedingProgramExemptionsProtein Dynamics Hit theProtonCirrusPseudo-Single-Bunch

  15. Single Cystal Services | The Ames Laboratory

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation ofAlbuquerque|Sensitive Species3 Outlook forSimulations Yield CluesSingle

  16. Statistical analysis of the temporal single-photon response of superconducting nanowire single photon detection

    E-Print Network [OSTI]

    He, Y -H; Zhang, W -J; Zhang, L; Wu, J -J; Chen, S -J; You, L -X; Wang, Z

    2015-01-01

    Counting rate is a key parameter of superconducting nanowire single photon detectors (SNSPD) and is determined by the current recovery time of an SNSPD after a detection event. We propose a new method to study the transient detection efficiency (DE) and pulse amplitude during the current recovery process by statistically analyzing the single photon response of an SNSPD under photon illumination with a high repetition rate. The transient DE results match well with the DEs deduced from the static current dependence of DE combined with the waveform of a single-photon detection event. This proves that the static measurement results can be used to analyze the transient current recovery process after a detection event. The results are relevant for understanding the current recovery process of SNSPDs after a detection event and for determining the counting rate of SNSPDs.

  17. Single Photon Emission from Single Perovskite Nanocrystals of Cesium Lead Bromide

    E-Print Network [OSTI]

    Hu, Fengrui; Sun, Chun; Yin, Chunyang; Lv, Bihu; Zhang, Chunfeng; Yu, William W; Wang, Xiaoyong; Zhang, Yu; Xiao, Min

    2015-01-01

    The power conversion efficiency of photovoltaic devices based on semiconductor perovskites has reached ~20% after just several years of research efforts. With concomitant discoveries of other promising applications in lasers, light-emitting diodes and photodetectors, it is natural to anticipate what further excitements these exotic perovskites could bring about. Here we report on the observation of single photon emission from single CsPbBr3 perovskite nanocrystals (NCs) synthesized from a facile colloidal approach. Compared with traditional metal-chalcogenide NCs, these CsPbBr3 NCs exhibit nearly two orders of magnitude increase in their absorption cross sections at similar emission colors. Moreover, the radiative lifetime of CsPbBr3 NCs is greatly shortened at both room and cryogenic temperatures to favor an extremely fast output of single photons. The above findings have not only added a novel member to the perovskite family for the integration into current optoelectronic architectures, but also paved the w...

  18. Multi-element superconducting nanowire single photon detectors

    E-Print Network [OSTI]

    Dauler, Eric A. (Eric Anthony), 1980-

    2009-01-01

    Single-photon-detector arrays can provide unparalleled performance and detailed information in applications that require precise timing and single photon sensitivity. Such arrays have been demonstrated using a number of ...

  19. Electrical properties of single wall carbon nanotube reinforced polyimide composites

    E-Print Network [OSTI]

    Ounaies, Zoubeida

    Electrical properties of single wall carbon nanotube reinforced polyimide composites Z. Ounaiesa of single wall carbon nanotube (SWNT) reinforced polyimide composites were investigated as a function nanotube; Composites 1. Introduction Polyimides are widely used in applications ranging from

  20. Ex Parte Communication re Energy Conservation Standards for Single...

    Energy Savers [EERE]

    Standards for Single Package Vertical Air Conditioners and Single Package Vertical Heat Pumps, 79 Fed. Reg. 78,614 (Dec. 30, 2014) (Docket No. EERE-2012-BT-STD-0041) Ex Parte...

  1. Fully Bayesian reconstructions from single photon emission computed

    E-Print Network [OSTI]

    Green, Peter

    Fully Bayesian reconstructions from single photon emission computed tomography data \\Lambda Iain S photon emission computerised tomography. 1 Introduction Single photon emission computerised tomography emission then occurs in the organ at a rate varying spatially according to the concentration. Indirect

  2. Multispectral optical tweezers for molecular diagnostics of single biological cells

    E-Print Network [OSTI]

    Wu, Shin-Tson

    Multispectral optical tweezers for molecular diagnostics of single biological cells Author, Townes Laser Institute, CREOL ­ The College of Optics and Photonics, Univ. of Central Florida (United States) ABSTRACT Optical trapping of single biological cells has become an established technique

  3. Ex Parte Communication re Energy Conservation Standards for Single...

    Office of Environmental Management (EM)

    Standards for Single Package Vertical Air Conditioners and Single Package Vertical Heat Pumps, 79 Fed. Reg. 78,614 (Dec. 30, 2014) (Docket No. EERE-2012-BT-STD-0041) Ex...

  4. Method for Turbocharging Single Cylinder Four Stroke Engines

    E-Print Network [OSTI]

    Buchman, Michael R.

    This paper presents a feasibility study of a method for turbocharging single cylinder, four-stroke internal combustion engines. Turbocharging is not conventionally used with single cylinder engines because of the timing ...

  5. Analysisi Benchmark of the Single Heater Test

    SciTech Connect (OSTI)

    H.M. Wade; H. Marr; M.J. Anderson

    2006-07-27

    The Single Heater Test (SHT) is the first of three in-situ thermal tests included in the site characterization program for the potential nuclear waste monitored geologic repository at Yucca Mountain. The heating phase of the SHT started in August 1996 and was concluded in May 1997 after 9 months of heating. Cooling continued until January 1998, at which time post-test characterization of the test block commenced. Numerous thermal, hydrological, mechanical, and chemical sensors monitored the coupled processes in the unsaturated fractured rock mass around the heater (CRWMS M&O 1999). The objective of this calculation is to benchmark a numerical simulation of the rock mass thermal behavior against the extensive data set that is available from the thermal test. The scope is limited to three-dimensional (3-D) numerical simulations of the computational domain of the Single Heater Test and surrounding rock mass. This calculation supports the waste package thermal design methodology, and is developed by Waste Package Department (WPD) under Office of Civilian Radioactive Waste Management (OCRWM) procedure AP-3.12Q, Revision 0, ICN 3, BSCN 1, Calculations.

  6. Hanford single-shell tank grouping study

    SciTech Connect (OSTI)

    Remund, K.M.; Anderson, C.M.; Simpson, B.C.

    1995-10-01

    A tank grouping study has been conducted to find Hanford single-shell tanks with similar waste properties. The limited sampling resources of the characterization program could be allocated more effectively by having a better understanding of the groups of tanks that have similar waste types. If meaningful groups of tanks can be identified, tank sampling requirements may be reduced, and the uncertainty of the characterization estimates may be narrowed. This tank grouping study considers the analytical sampling information and the historical information that is available for all single-shell tanks. The two primary sources of historical characterization estimates and information come from the Historical Tank Content Estimate (HTCE) Model and the Sort on Radioactive Waste Tanks (SORWT) Model. The sampling and historical information are used together to come up with meaningful groups of similar tanks. Based on the results of analyses presented in this report, credible tank grouping looks very promising. Some groups defined using historical information (HTCE and SORWT) correspond well with those based on analytical data alone.

  7. Ultrasonic characterization of single drops of liquids

    DOE Patents [OSTI]

    Sinha, D.N.

    1998-04-14

    Ultrasonic characterization of single drops of liquids is disclosed. The present invention includes the use of two closely spaced transducers, or one transducer and a closely spaced reflector plate, to form an interferometer suitable for ultrasonic characterization of droplet-size and smaller samples without the need for a container. The droplet is held between the interferometer elements, whose distance apart may be adjusted, by surface tension. The surfaces of the interferometer elements may be readily cleansed by a stream of solvent followed by purified air when it is desired to change samples. A single drop of liquid is sufficient for high-quality measurement. Examples of samples which may be investigated using the apparatus and method of the present invention include biological specimens (tear drops; blood and other body fluid samples; samples from tumors, tissues, and organs; secretions from tissues and organs; snake and bee venom, etc.) for diagnostic evaluation, samples in forensic investigations, and detection of drugs in small quantities. 5 figs.

  8. Evolution of bilaterian central nervous systems: a single origin?

    E-Print Network [OSTI]

    2013-01-01

    muscle, derived from mesoderm, allowing active locomotion and a gut with either a single opening or a separate mouth and

  9. Administrator's Record of Decision (ROD) on New Large Single...

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

    NEW LARGE SINGLE LOAD POLICY ISSUE REVIEW ADMINISTRATOR'S RECORD OF DECISION MARCH 2002 TABLE OF CONTENTS I. Introduction ......

  10. Coherent, Mechanical Control of a Single Electronic Spin Sungkun Hong,,

    E-Print Network [OSTI]

    Yacoby, Amir

    Coherent, Mechanical Control of a Single Electronic Spin Sungkun Hong,, Michael S. Grinolds coherent quantum control of a single spin driven by the motion of a mechanical resonator. The motion of a mechanical resonator is magnetically coupled to the electronic spin of a single nitrogen-vacancy center

  11. Aalborg Universitet Single stage grid converters for battery energy storage

    E-Print Network [OSTI]

    Munk-Nielsen, Stig

    Aalborg Universitet Single stage grid converters for battery energy storage Trintis, Ionut; Munk). Single stage grid converters for battery energy storage. In 5th IET International Conference on Power from vbn.aau.dk on: juli 04, 2015 #12;SINGLE STAGE GRID CONVERTERS FOR BATTERY ENERGY STORAGE I

  12. Single Database Private Information Retrieval with Logarithmic Communication

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Single Database Private Information Retrieval with Logarithmic Communication Yan­Cheng Chang of single database private information retrieval, and present schemes with only logarithmic server Single database private information retrieval (1dPIR) is a cryptographic protocol between a database

  13. Single photon emission and detection at the nanoscale

    E-Print Network [OSTI]

    semiconductor nanowires. Our single photon emitter is based on a single InAsP quantum dot embedded in a p the single quantum dot by electrical injection of electrons and holes. The optical quality of the quantum dot emission is shown to improve when surrounding the dot material by a small intrinsic section of InP. Finally

  14. Bacterial protein complexes studied by single-molecule imaging and single-cell micromanipulation techniques in microfluidic devices 

    E-Print Network [OSTI]

    Reuter, Marcel

    2010-06-28

    Biological systems of bacteria were investigated at the single-cell and single-molecule level. Additionally, aspects of the techniques employed were studied. A unifying theme in each project is the reliance on optical ...

  15. A single-particle/single-cell microbeam based on an isotopic alpha source

    E-Print Network [OSTI]

    . Randers-Pehrson, D.J. Brenner Columbia University, Radiological Research Accelerator Facility, 136 S-alone; Accelerator 1. Introduction and overall design Columbia UniversityŐs Radiological Research Accelerator Facility (RARAF) is home to a sin- gle-cell/single-particle microbeam based on a 4.2 MV Van de Graaff

  16. Unified single-photon and single-electron counting statistics: From cavity QED to electron transport

    SciTech Connect (OSTI)

    Lambert, Neill [Advanced Science Institute, RIKEN, Saitama 351-0198 (Japan); Chen, Yueh-Nan [Department of Physics and National Center for Theoretical Sciences, National Cheng-Kung University, Tainan 701, Taiwan (China); Nori, Franco [Advanced Science Institute, RIKEN, Saitama 351-0198 (Japan); Physics Department, University of Michigan, Ann Arbor, MI 48109-1040 (United States)

    2010-12-15

    A key ingredient of cavity QED is the coupling between the discrete energy levels of an atom and photons in a single-mode cavity. The addition of periodic ultrashort laser pulses allows one to use such a system as a source of single photons--a vital ingredient in quantum information and optical computing schemes. Here we analyze and time-adjust the photon-counting statistics of such a single-photon source and show that the photon statistics can be described by a simple transport-like nonequilibrium model. We then show that there is a one-to-one correspondence of this model to that of nonequilibrium transport of electrons through a double quantum dot nanostructure, unifying the fields of photon-counting statistics and electron-transport statistics. This correspondence empowers us to adapt several tools previously used for detecting quantum behavior in electron-transport systems (e.g., super-Poissonian shot noise and an extension of the Leggett-Garg inequality) to single-photon-source experiments.

  17. Fabrication of single crystalline, uniaxial single domain Co nanowire arrays with high coercivity

    SciTech Connect (OSTI)

    Ramazani, A. Almasi Kashi, M.; Montazer, A. H.

    2014-03-21

    Whilst Co nanorods with high coercivity were synthesized during recent years, they did not achieve the same results as for Co nanowires embedded in solid templates. In the present work, Co nanowire arrays (NWAs) with high coercivity were successfully fabricated in porous aluminum oxide template under optimum conditions by using pulsed ac electrodeposition technique. Magnetic properties and crystalline characteristics of the nanowires were investigated by hysteresis loop measurements, first-order reversal curve (FORC) analysis, X-ray diffraction (XRD), and selected area electron diffraction (SAED) patterns. Hysteresis loop measurements showed high coercivity of about 4.8 kOe at room temperature together with optimum squareness of 1, resulting in an increase of the previous maximum coercivity for Co NWAs up to 45%. XRD and SAED patterns revealed a single crystalline texture along the [0002] direction, indicating the large magnetocrystalline anisotropy. On the other hand, FORC analysis confirmed a single domain structure for the Co NWAs. In addition, the reversal mechanism of the single crystalline, single domain Co NWAs was studied which resulted in the fixed easy axis with a coherent rotation. Accordingly, these nanowires might offer promising applications in high density bit patterned media and low power logic devices.

  18. Single-periodic-film optical bandpass filter

    E-Print Network [OSTI]

    Niraula, Manoj; Magnusson, Robert

    2015-01-01

    Resonant periodic surfaces and films enable new functionalities with wide applicability in practical optical systems. Their material sparsity, ease of fabrication, and minimal interface count provide environmental and thermal stability and robustness in applications. Here we report an experimental bandpass filter fashioned in a single patterned layer on a substrate. Its performance corresponds to bandpass filters requiring perhaps 30 traditional thin-film layers as shown by an example. We demonstrate an ultra-narrow, high-efficiency bandpass filter with extremely wide, flat, and low sidebands. This class of devices is designed with rigorous solutions of the Maxwell equations while engaging the physical principles of resonant waveguide gratings. The proposed technology is integration-friendly and opens doors for further development in various disciplines and spectral regions where thin-film solutions are traditionally applied.

  19. Physics Beyond the Single Top Quark Observation

    SciTech Connect (OSTI)

    Heinson, A.P.; Collaboration, for the DZero

    2010-10-01

    In March 2009, the D0 Collaboration first observed the electroweak production of single top quarks at 5{sigma} significance. We measured the cross section for the combined s-channel and t-channel production modes, and set a lower limit on the CKM matrix element |V{sub tb}|. Since then, we have used the same dataset to measure the t-channel production mode independently, the combined cross section in the hadronically-decaying tau lepton final state, and the width and lifetime of the top quark, and we have set upper limits on contributions from anomalous flavor-changing neutral currents. This paper describes these new measurements, as presented at the 3rd International Workshop on Top Quark Physics, held in Brugge, Belgium, May 31-June 4, 2010.

  20. Single Spin Asymmetry in Charmonium Production

    E-Print Network [OSTI]

    Rohini M. Godbole; Abhiram Kaushik; Anuradha Misra; Vaibhav S. Rawoot

    2014-11-14

    We present estimates of Single Spin Asymmetry (SSA) in the electroproduction of $J/\\psi$ taking into account the transverse momentum dependent (TMD) evolution of the gluon Sivers function and using Color Evaporation Model of charmonium production. We estimate SSA for JLab, HERMES, COMPASS and eRHIC energies using recent parameters for the quark Sivers functions which are fitted using an evolution kernel in which the perturbative part is resummed up to next-to-leading logarithms (NLL) accuracy. We find that these SSAs are much smaller as compared to our first estimates obtained using DGLAP evolution but are comparable to our estimates obtained using TMD evolution where we had used approximate analytical solution of the TMD evolution equation for the purpose.

  1. Single Spin Asymmetry in Charmonium Production

    E-Print Network [OSTI]

    Godbole, Rohini M; Misra, Anuradha; Rawoot, Vaibhav S

    2014-01-01

    We present estimates of Single Spin Asymmetry (SSA) in the electroproduction of $J/\\psi$ taking into account the transverse momentum dependent (TMD) evolution of the gluon Sivers function and using Color Evaporation Model of charmonium production. We estimate SSA for JLab, HERMES, COMPASS and eRHIC energies using recent parameters for the quark Sivers functions which are fitted using an evolution kernel in which the perturbative part is resummed up to next-to-leading logarithms (NLL) accuracy. We find that these SSAs are much smaller as compared to our first estimates obtained using DGLAP evolution but are comparable to our estimates obtained using TMD evolution where we had used approximate analytical solution of the TMD evolution equation for the purpose.

  2. Circuit electromechanics with single photon strong coupling

    E-Print Network [OSTI]

    Zheng-Yuan Xue; Li-Na Yang; Jian Zhou

    2015-07-13

    In circuit electromechanics, the coupling strength is usually very small. Here, replacing the capacitor in circuit electromechanics by a superconducting flux qubit, we show that the coupling among the qubit and the two resonators can induce effective electromechanical coupling which can attain the strong coupling regime at the single photon level with feasible experimental parameters. We use dispersive couplings among two resonators and the qubit while the qubit is also driven by an external classical field. These couplings form a three-wave mixing configuration among the three elements where the qubit degree of freedom can be adiabatically eliminated, and thus results in the enhanced coupling between the two resonators. Therefore, our work constitutes the first step towards studying quantum nonlinear effect in circuit electromechanics.

  3. Inflation in Supergravity with a Single Superfield

    E-Print Network [OSTI]

    Terada, Takahiro

    2015-01-01

    Supergravity is a well-motivated theory beyond the standard model of particle physics, and a suitable arena to study high-energy physics at the early universe including inflation, whose observational evidences are growing more and more. Inflation in supergravity, however, cannot be easily described because of restrictions from supersymmetry (SUSY). The scalar potential has an exponential factor and a large negative term whereas a flat and positive potential is needed to realize inflation. The standard method to obtain such an inflationary scalar potential requires an additional superfield to the one containing inflaton. In this thesis, we propose and develop an alternative method which does not require the additional superfield and thus reduces the necessary degrees of freedom by half. That is, we study inflation in supergravity with only a single chiral superfield which contains inflaton. We accomplish it by introducing a higher dimensional term in the inflaton Kahler potential, which plays an important dual...

  4. Solar cell structure incorporating a novel single crystal silicon material

    DOE Patents [OSTI]

    Pankove, Jacques I. (Princeton, NJ); Wu, Chung P. (Trenton, NJ)

    1983-01-01

    A novel hydrogen rich single crystal silicon material having a band gap energy greater than 1.1 eV can be fabricated by forming an amorphous region of graded crystallinity in a body of single crystalline silicon and thereafter contacting the region with atomic hydrogen followed by pulsed laser annealing at a sufficient power and for a sufficient duration to recrystallize the region into single crystal silicon without out-gassing the hydrogen. The new material can be used to fabricate semiconductor devices such as single crystal silicon solar cells with surface window regions having a greater band gap energy than that of single crystal silicon without hydrogen.

  5. Measurements of heavy quark production via single leptons at PHENIX

    E-Print Network [OSTI]

    Donald Hornback; for the PHENIX Collaboration

    2008-04-30

    The measurement of single leptons from the semi-leptonic decay of heavy-flavor hadrons has long been a means for studying heavy-quark production. PHENIX has measured single muons in pp collisions at forward rapidity and single electrons in both pp and AuAu collisions at mid-rapidity at sqrt(s_NN)=200 GeV. The most recent PHENIX single lepton results are presented in the context of state-of-the-art pQCD calculations. An updated azimuthal anisotropy, v2(pT), measurement for heavy-flavor single electrons in AuAu collisions is also presented.

  6. System and method for single-phase, single-stage grid-interactive inverter

    DOE Patents [OSTI]

    Liu, Liming; Li, Hui

    2015-09-01

    The present invention provides for the integration of distributed renewable energy sources/storages utilizing a cascaded DC-AC inverter, thereby eliminating the need for a DC-DC converter. The ability to segment the energy sources and energy storages improves the maintenance capability and system reliability of the distributed generation system, as well as achieve wide range reactive power compensation. In the absence of a DC-DC converter, single stage energy conversion can be achieved to enhance energy conversion efficiency.

  7. Single-fiber multi-color pyrometry

    DOE Patents [OSTI]

    Small, IV, Ward; Celliers, Peter

    2004-01-27

    This invention is a fiber-based multi-color pyrometry set-up for real-time non-contact temperature and emissivity measurement. The system includes a single optical fiber to collect radiation emitted by a target, a reflective rotating chopper to split the collected radiation into two or more paths while modulating the radiation for lock-in amplification (i.e., phase-sensitive detection), at least two detectors possibly of different spectral bandwidths with or without filters to limit the wavelength regions detected and optics to direct and focus the radiation onto the sensitive areas of the detectors. A computer algorithm is used to calculate the true temperature and emissivity of a target based on blackbody calibrations. The system components are enclosed in a light-tight housing, with provision for the fiber to extend outside to collect the radiation. Radiation emitted by the target is transmitted through the fiber to the reflective chopper, which either allows the radiation to pass straight through or reflects the radiation into one or more separate paths. Each path includes a detector with or without filters and corresponding optics to direct and focus the radiation onto the active area of the detector. The signals are recovered using lock-in amplification. Calibration formulas for the signals obtained using a blackbody of known temperature are used to compute the true temperature and emissivity of the target. The temperature range of the pyrometer system is determined by the spectral characteristics of the optical components.

  8. Improving Pulsar Timing Precision with Single Pulses

    E-Print Network [OSTI]

    Kerr, Matthew

    2015-01-01

    The measurement error of pulse times of arrival (TOAs) in the high S/N limit is dominated by the quasi-random variation of a pulsar's emission profile from rotation to rotation. Like measurement noise, this noise is only reduced as the square root of observing time, posing a major challenge to future pulsar timing campaigns with large aperture telescopes, e.g. the Five-hundred-metre Aperture Spherical Telescope and the Square Kilometre Array. We propose a new method of pulsar timing that attempts to approximate the pulse-to-pulse variability with a small family of 'basis' pulses. If pulsar data are integrated over many rotations, this basis can be used to measure sub-pulse structure. Or, if high-time resolution data are available, the basis can be used to 'tag' single pulses and produce an optimal timing template. With realistic simulations, we show that these applications can dramatically reduce the effect of pulse-to-pulse variability on TOAs. Using high-time resolution data taken from the bright PSR J0835-...

  9. Single-fiber multi-color pyrometry

    DOE Patents [OSTI]

    Small, IV, Ward (Livermore, CA); Celliers, Peter (Berkeley, CA)

    2000-01-01

    This invention is a fiber-based multi-color pyrometry set-up for real-time non-contact temperature and emissivity measurement. The system includes a single optical fiber to collect radiation emitted by a target, a reflective rotating chopper to split the collected radiation into two or more paths while modulating the radiation for lock-in amplification (i.e., phase-sensitive detection), at least two detectors possibly of different spectral bandwidths with or without filters to limit the wavelength regions detected and optics to direct and focus the radiation onto the sensitive areas of the detectors. A computer algorithm is used to calculate the true temperature and emissivity of a target based on blackbody calibrations. The system components are enclosed in a light-tight housing, with provision for the fiber to extend outside to collect the radiation. Radiation emitted by the target is transmitted through the fiber to the reflective chopper, which either allows the radiation to pass straight through or reflects the radiation into one or more separate paths. Each path includes a detector with or without filters and corresponding optics to direct and focus the radiation onto the active area of the detector. The signals are recovered using lock-in amplification. Calibration formulas for the signals obtained using a blackbody of known temperature are used to compute the true temperature and emissivity of the target. The temperature range of the pyrometer system is determined by the spectral characteristics of the optical components.

  10. Quantum, Photo-Electric Single Capacitor Paradox

    E-Print Network [OSTI]

    Darko Kapor; Vladan Pankovic

    2009-12-10

    In this work single capacitor paradox (a variation of the remarkable two capacitor paradox) is considered in a new, quantum discrete form. Simply speaking we consider well-known usual, photoelectric effect experimental device, i.e. photo electric cell, where cathode and anode are equivalently charged but non-connected. It, obviously, represents a capacitor that initially, i.e. before action of the photons with individual energy equivalent to work function, holds corresponding energy of the electrical fields between cathode and anode. Further, we direct quantum discretely photons, one by one, toward cathode where according to photo-electrical effect electrons discretely, one by one, will be emitted and directed toward anode. It causes discrete discharge of the cell, i.e. capacitor and discrete decrease of the electrical field. Finally, total discharge of the cell, i.e. capacitor, and total disappearance of the electrical field and its energy will occur. Given, seemingly paradoxical, capacitor total energy loss can be simply explained without any dissipative effects (Joule heating or electromagnetic waves emission can be neglected as high order small corrections) by work done by the electrical field by movement of the electrons from cathode to anode. (Remarkable two capacitors paradox can be, obviously, formulated and explained in the completely analogous way.)

  11. Transmittance of single wall carbon nanotubes

    SciTech Connect (OSTI)

    Holmes, W.; Hone, J.; Richards, P.L.; Zettl, A.

    2001-07-31

    The authors have measured the far infrared absorption of single wall carbon nanotube (SWNT) ropes at 1.5K and SWNT ropes in polyethylene (PE) over the range 1.5 < T < 300 K. A weak peak is observed at 28 cm{sup -1} at 1.5K for free standing SWNT samples. The frequency and temperature dependence of the peak is consistent with absorption by an E{sub 2g} symmetric, ''squash mode'', SWNT phonon, which is infrared active due to an adsorbate or disorder. The peak frequency for SWNT ropes in PE is at 40 cm{sup -1} and temperature dependent. They attribute the increase in the frequency of the peak for SWNT in PE to the effect of {approx} 0.2GPa of hydrostatic pressure exerted on the SWNT ropes due to the thermal contraction of PE when cooled to low temperatures. Using two independent methods, they estimate that the SWNT may radially buckle at this pressure. The buckling distortion may cause the pressure dependence of the peak frequency. They cannot rule out the possibility that the peak is an absorption onset from adsorbate modes extrinsic to the SWNT or from interband transitions at a small electronic band gap. An effective medium calculation of Drude metal grains in polyethylene gives a frequency dependence consistent with their data, but the model underestimates the strength of scattering by orders of magnitude.

  12. Identification of products containing {single_bond}COOH, {single_bond}OH, and {single_bond}C{double_bond}O in atmospheric oxidation of hydrocarbons

    SciTech Connect (OSTI)

    Yu, J.; Flagan, R.C.; Seinfeld, J.H.

    1998-08-15

    Atmospheric oxidation of hydrocarbons by hydroxyl radicals and ozone leads to products containing {single_bond}COOH, {single_bond}OH, and {single_bond}C{double_bond}O functional groups. The high polarity of such compounds precludes direct GC-MS analysis. In addition, many such compounds often exist in a single sample at trace levels. An analytical method has been developed to identify compounds containing one or more functional groups of carbonyl, carboxy, and hydroxy in atmospheric samples. In the method, {single_bond}C{double_bond}O groups are derivatized using O-(2,3,4,5,6-pentafluorobenzyl) hydroxy amine(PFBHA), and {single_bond}COOH and {single_bond}OH groups are derivatized using a silylation reagent N,O-bis(trimethylsilyl)-trifluoroacetamide (BSTFA). The derivatives are easily resolved by a GC column. The chemical ionization mass spectra of these derivatives exhibit several pseudomolecular ions, allowing unambiguous determination of molecular weights. Functional group identification is accomplished by monitoring the ions in the electron ionization mass spectra that are characteristic of each functional group derivative: m/z 181 for carbonyl and m/z 73 and 75 for carboxyl and hydroxy groups. The method is used to identify products in laboratory studies of ozone oxidation of {alpha}-pinene and {Delta}{sup 3}-carene.

  13. Ultrafast electrical control of a resonantly driven single photon source

    SciTech Connect (OSTI)

    Cao, Y.; Bennett, A. J. Ellis, D. J. P.; Shields, A. J.; Farrer, I.; Ritchie, D. A.

    2014-08-04

    We demonstrate generation of a pulsed stream of electrically triggered single photons in resonance fluorescence, by applying high frequency electrical pulses to a single quantum dot in a p-i-n diode under resonant laser excitation. Single photon emission was verified, with the probability of multiple photon emission reduced to 2.8%. We show that despite the presence of charge noise in the emission spectrum of the dot, resonant excitation acts as a “filter” to generate narrow bandwidth photons.

  14. Mapping Metals Incorporation of a Single Catalyst Particle Using...

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

    Mapping Metals Incorporation of a Single Catalyst Particle Using Element Specific X-ray Nanotomography Tuesday, March 31, 2015 Fluid catalytic cracking (FCC) is the refining...

  15. Ultratough CVD single crystal diamond and three dimensional growth thereof

    DOE Patents [OSTI]

    Hemley, Russell J. (Washington, DC); Mao, Ho-kwang (Washington, DC); Yan, Chih-shiue (Washington, DC)

    2009-09-29

    The invention relates to a single-crystal diamond grown by microwave plasma chemical vapor deposition that has a toughness of at least about 30 MPa m.sup.1/2. The invention also relates to a method of producing a single-crystal diamond with a toughness of at least about 30 MPa m.sup.1/2. The invention further relates to a process for producing a single crystal CVD diamond in three dimensions on a single crystal diamond substrate.

  16. Thermal Imaging of Single Living Cells Using Semiconductor Quantum Dots

    E-Print Network [OSTI]

    Yang, Jui-Ming

    2009-01-01

    A novel method of thermal activation and temperatureS. Ishiwata, "Imaging of thermal activation of actomyosinbeen used to image thermal activation of single actomyosin

  17. A Method for Evaluating Fire After Earthquake Scenarios for Single...

    Office of Environmental Management (EM)

    public release; distribution I unlimited. Title: A Method for Evaluating Fire After Earthquake Scenarios for Single Buildings Authors: Elizabeth J. Kelly and Raymond N. Tell...

  18. A Single Crystalline Porphyrinic Titanium Metal-Organic Framework...

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

    Single Crystalline Porphyrinic Titanium Metal-Organic Framework Previous Next List Yuan, Shuai; Liu, Tian-Fu; Feng, Dawei; Tian, Jian; Wang, Kecheng; Qin, Junsheng; Zhang, Qiang;...

  19. Single Step Manufacturing of Low Catalyst Loading Electrolyzer...

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

    Gen Process) Direct Coat onto Membrane Manufacture MEA through Single-step Catalyst Pyrolysis and Membrane Deposition. Synthesize Catalyst Ink Transfer Ink to Substrate Drive-off...

  20. Environmental Genomics Reveals a Single-Species Ecosystem Deep Earth

    E-Print Network [OSTI]

    Arkin, Adam P.

    2014-01-01

    Environmental Genomics Reveals a Single-Species EcosystemTechnology Program, DOE Joint Genomics Institute, Berkeley,and Environmental Research, Genomics:GTL program through

  1. Generating and executing programs for a floating point single...

    Office of Scientific and Technical Information (OSTI)

    Generating and executing programs for a floating point single instruction multiple data instruction set architecture Citation Details In-Document Search Title: Generating and...

  2. Single ion conductor cross-linked polymeric networks

    DOE Patents [OSTI]

    Kerr, John Borland (Oakland, CA); Wang, Shanger (Fairfield, CA); Hou, Jun (Painted Post, NY); Sloop, Steven Edward (Berkeley, CA); Han, Yong Bong (Berkeley, CA); Liu, Gao (Oakland, CA)

    2011-03-08

    Single ion conductors comprising polymer electrolytes prepared by grafting a salt compound onto a comb-branch polymer or dendrimer are disclosed having superior properties.

  3. Single ion conductor cross-linked polymeric networks

    DOE Patents [OSTI]

    Kerr, John Borland (Oakland, CA); Wang, Shanger (Fairfield, CA); Han, Yong Bong (Berkeley, CA); Liu, Gao (Oakland, CA); Hou, Jun (Painted Post, NY); Sloop, Steven Edward (Berkeley, CA)

    2005-10-18

    Single ion conductors comprising polymer electrolytes prepared by grafting a salt compound onto a comb-branch polymer or dendrimer are disclosed having superior properties.

  4. Two-Stage Decomposition Algorithms for Single Product Maritime ...

    E-Print Network [OSTI]

    2013-09-21

    The single product MIRP considered in this paper is best described in terms of its main ..... emanating from the source node), sink arcs (arcs entering the sink node)

  5. Theoretical overview on top pair production and single top production

    E-Print Network [OSTI]

    Stefan Weinzierl

    2012-01-19

    In this talk I will give an overview on theoretical aspects of top quark physics. The focus lies on top pair production and single top production.

  6. Atomically Thin Heterostructures based on Single-Layer Tungsten...

    Office of Scientific and Technical Information (OSTI)

    Atomically Thin Heterostructures based on Single-Layer Tungsten Diselenide and Graphene. Citation Details In-Document Search Title: Atomically Thin Heterostructures based on...

  7. Controlled Covalent Modification of Epitaxial Single Layer Graphene...

    Office of Scientific and Technical Information (OSTI)

    Controlled Covalent Modification of Epitaxial Single Layer Graphene on 6H-SiC (0001) with Aryliodonium Salts using Electrochemical Methods. Citation Details In-Document Search...

  8. Inducing and Quantifying Forbidden Reactivity with Single Molecule...

    Office of Scientific and Technical Information (OSTI)

    Inducing and Quantifying Forbidden Reactivity with Single Molecule Polymer Mechanochemistry Citation Details In-Document Search Title: Inducing and Quantifying Forbidden Reactivity...

  9. Electrically pumped single-photon emission at room temperature from a single InGaN/GaN quantum dot

    SciTech Connect (OSTI)

    Deshpande, Saniya; Frost, Thomas; Hazari, Arnab; Bhattacharya, Pallab, E-mail: pkb@eecs.umich.edu [Center for Photonics and Multiscale Nanomaterials, Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Avenue, Ann Arbor, Michigan 48109 (United States)

    2014-10-06

    We demonstrate a semiconductor quantum dot based electrically pumped single-photon source operating at room temperature. Single photons emitted in the red spectral range from single In{sub 0.4}Ga{sub 0.6}N/GaN quantum dots exhibit a second-order correlation value g{sup (2)}(0) of 0.29, and fast recombination lifetime ?1.3 ±0.3 ns at room temperature. The single-photon source can be driven at an excitation repetition rate of 200?MHz.

  10. MATERIALS PERSPECTIVE Intermittent plastic flow of single crystals

    E-Print Network [OSTI]

    Niewczas, Marek

    MATERIALS PERSPECTIVE Intermittent plastic flow of single crystals: central problems in plasticity: a review M. Niewczas* The relationships between microstructure and plastic flow properties of copper single crystals deformed at low temperatures are reviewed based on the analysis of experimental results

  11. Single-channel fits and K-matrix constraints

    E-Print Network [OSTI]

    R. L. Workman

    2006-01-10

    A K-matrix formalism is used to relate single-channel and multi-channel fits. We show how the single-channel formalism changes as new hadronic channels become accessible. These relations are compared to those commonly used to fit pseudoscalar meson photoproduction data.

  12. Vectorial Growth of Metallic and Semiconducting Single-Wall Carbon

    E-Print Network [OSTI]

    Joselevich, Ernesto

    obstacles toward nanotube-based electronic technology. Vectorial growth of SWNTs is a new approach wherebyVectorial Growth of Metallic and Semiconducting Single-Wall Carbon Nanotubes Ernesto Joselevich growth of single-wall carbon nanotube arrays is presented. The origin of growth is defined by patterning

  13. ON FEATURE BASED AUTOMATIC CLASSIFICATION OF SINGLE AND MULTITONE SIGNALS

    E-Print Network [OSTI]

    Arabshahi, Payman

    ON FEATURE BASED AUTOMATIC CLASSIFICATION OF SINGLE AND MULTITONE SIGNALS Arindam K. Das, Payman of interest has not been previ- ously observed; it is not part of a library of known signals; and no automated demonstrating the feasibility of the above features for au- tomatic classification purposes of single

  14. Electrostatic trapping of single conducting nanoparticles between nanoelectrodes

    E-Print Network [OSTI]

    Dekker, Cees

    nanoparticle show single electron tunneling coexisting with tunnel-barrier suppression. © 1997 AmericanElectrostatic trapping of single conducting nanoparticles between nanoelectrodes A. Bezryadina Received 4 June 1997; accepted for publication 8 July 1997 For molecular electronics, one needs the ability

  15. Optimal storage and retrieval of single-photon waveforms

    E-Print Network [OSTI]

    Du, Shengwang

    Optimal storage and retrieval of single-photon waveforms Shuyu Zhou,1 Shanchao Zhang,1 Chang Liu,1 demonstration of optimal storage and retrieval of heralded single-photon wave packets using electromagnet- ically induced transparency (EIT) in cold atoms at a high optical depth. We obtain an optimal storage

  16. Single Sub-20 nm Wide, Centimeter-Long Nanofluidic Channel

    E-Print Network [OSTI]

    Single Sub-20 nm Wide, Centimeter-Long Nanofluidic Channel Fabricated by Novel Nanoimprint Mold an imprint mold of a channel pattern and nanoimprint to duplicate such channel. The centimeter-long channel without additional size shrinking.17 Single channels have been fabricated by using edge patterning18 (note

  17. Simultaneous SHG of orthogonally polarized fundamentals in single QPM crystals

    E-Print Network [OSTI]

    Simultaneous SHG of orthogonally polarized fundamentals in single QPM crystals Benjamin F. Johnston - electric field poling assisted by laser micro-machined topographical electrodes. To date, single period harmonic generation of 1064nm laser light with 1st order type-I and 7th order type-0 QPM simultaneously

  18. Wind Noise Reduction in Single Channel Speech Signals

    E-Print Network [OSTI]

    Wind Noise Reduction in Single Channel Speech Signals Kristian Timm Andersen Kongens Lyngby 2008;Abstract In this thesis a number of wind noise reduction techniques have been reviewed, implemented and evaluated. The focus is on reducing wind noise from speech in single channel signals. More specically

  19. Ultrathin Single-Walled Carbon Nanotube Network Framed Graphene Hybrids

    E-Print Network [OSTI]

    Wikswo, John

    Ultrathin Single-Walled Carbon Nanotube Network Framed Graphene Hybrids Rui Wang, Tu Hong, and Ya ABSTRACT: Graphene and single-walled carbon nanotubes (SWNTs) have shown superior potential in electronics method is developed to synthesize ultrathin SWNT-graphene films through chemical vapor deposition

  20. Cavity Enhancement of Single Quantum Dot Emission in the Blue

    E-Print Network [OSTI]

    2009-12-27

    Abstract Cavity-enhanced single-photon emission in the blue spectral region was measured from single InGaN/GaN quantum dots. The low-Q microcavities used were characterized using micro-reflectance spectroscopy where the source was the enhanced blue...

  1. Single Database Private Information Retrieval with Logarithmic Communication

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Single Database Private Information Retrieval with Logarithmic Communication Yan-Cheng Chang of single database private information retrieval, and present schemes with only logarithmic server database private information retrieval (1dPIR) is a cryptographic protocol between a database server, who

  2. Mechanical nanomanipulation of single strain-induced semiconductor quantum dots

    E-Print Network [OSTI]

    Ludwig-Maximilians-Universität, München

    Mechanical nanomanipulation of single strain-induced semiconductor quantum dots C. Obermu¨ller, A of single strain-induced Ga0.9In0.1As quantum dots. This was achieved by scanning a metal coated tapered of the dots2 owing to the lattice mismatch between the materials. In this case the InP islands are acting

  3. Single-DNA Molecule Nanomotor Regulated by Photons

    E-Print Network [OSTI]

    Tan, Weihong

    Single-DNA Molecule Nanomotor Regulated by Photons Huaizhi Kang, Haipeng Liu, Joseph A. Phillips the design of a single-molecule nanomotor driven by photons. The nanomotor is a DNA hairpin photonic wires,8 enzyme assemblies,9 and functional DNA probes.10,11 Similar to RNA or protein

  4. Recovering Light Directions and Camera Poses from a Single Sphere

    E-Print Network [OSTI]

    Wong, Kenneth K.Y.

    Recovering Light Directions and Camera Poses from a Single Sphere Kwan-Yee K. Wong, Dirk Schnieders,sdirk,sdli]@cs.hku.hk Abstract. This paper introduces a novel method for recovering both the light directions and camera poses from a single sphere. Traditional methods for estimating light directions using spheres either assume

  5. High Efficiency Single Photon Detection via Frequency Up-Conversion

    E-Print Network [OSTI]

    Kwiat, Paul

    High Efficiency Single Photon Detection via Frequency Up-Conversion Aaron P. VanDevender and Paul G the much higher efficiency of silicon APDs at these wavelengths. We have used a Periodically Poled Lithium. We observed conversion efficiencies as high as 80%, and demonstrated scaling down to the single

  6. Modeling Contaminant Exposure in a Single-Family House

    E-Print Network [OSTI]

    Chen, Qingyan "Yan"

    occupational exposure to household contaminants in a single-family house under different ventilation, heating the performance of two heating systems, two cooling systems and three ventilation systems in summer and winter contaminant exposure in a generic, small single-family house with a floor area of 100 m2 and a height of 2.5 m

  7. Controlled Multistep Purification of Single-Walled Carbon Nanotubes

    E-Print Network [OSTI]

    Wikswo, John

    Controlled Multistep Purification of Single-Walled Carbon Nanotubes Ya-Qiong Xu,,§ Haiqing Peng materials from raw single-walled carbon nanotubes (SWNTs) produced in the HiPco (high-pressure CO) process at increasing temperatures. To avoid catalytic oxidation by iron oxide of carbon nanotubes, the exposed

  8. Multi-Sensor Single-Actuator Control of HVAC Systems 

    E-Print Network [OSTI]

    Lin, C.; Auslander, D.; Federspiel, C.

    2002-01-01

    to replace the single sensor in one room with a network of sensors having at least one sensor per room. This paper addresses this multi-sensor, single-actuator control problem. We used computer simulations and optimization to study the problem. We designed a...

  9. ORIGINAL ARTICLE Single ferroelectric-domain photovoltaic switch based

    E-Print Network [OSTI]

    Jo, Moon-Ho

    ORIGINAL ARTICLE Single ferroelectric-domain photovoltaic switch based on lateral BiFeO3 cells Ji serves as a basis for solid-state memory. This phenomenon can also yield an interesting photovoltaic imposed by the ferroelectric polarization vectors. Here, we demonstrate a single-domain photovoltaic

  10. Supplementary Material Free energy recovery in single molecule experiments

    E-Print Network [OSTI]

    Ritort, Felix

    Supplementary Material Free energy recovery in single molecule experiments Single molecule force measurements (experimental setup shown in Fig. S1) can be used to determine free-energy differences between the unfolding process and using the thermodynamic relation revWG = , we can estimate the RNA folding free energy

  11. Heritable Stochastic Switching Revealed by Single-Cell Genealogy

    E-Print Network [OSTI]

    van Oudenaarden, Alexander

    Heritable Stochastic Switching Revealed by Single-Cell Genealogy Benjamin B. Kaufmann1,2[ , Qiong switching revealed by single-cell genealogy. PLoS Biol 5(9): e239. doi:10.1371/ journal.pbio.0050239 measurements of phenotype stability, switching, and herit- ability are rare, both because detailed genealogical

  12. Three-dimensional wave propagation through single crystal solidliquid interfaces

    E-Print Network [OSTI]

    Wadley, Haydn

    Three-dimensional wave propagation through single crystal solid­liquid interfaces Yichi Lua solid­ liquid interfaces during single crystal growth. A previously developed two-dimensional ray across solid­liquid interfaces in cylindrical bodies where the receiver is located at an arbitrary

  13. Single shot ultrafast dynamic ellipsometry (UDE) of laser-driven shocks in single crystal explosives

    SciTech Connect (OSTI)

    Whitley, Von H; Mcgrane, Shawn D; Moore, David S; Eakins, Dan E; Bolme, Cindy A

    2009-01-01

    We report on the first experiments to measure states in shocked energetic single crystals with dynamic ellipsometry. We demonstrate that these ellipsometric techniques can produce reasonable Hugoniot values using small amounts of crystalline RDX and PETN. Pressures, particle velocities and shock velocities obtained using shocked ellipsometry are comparable to those found using gas-gun flyer plates and molecular dynamics calculations. The adaptation of the technique from uniform thin films of polymers to thick non-perfect crystalline materials was a significant achievement. Correct sample preparation proved to be a crucial component. Through trial and error, we were able to resolve polishing issues, sample quality problems, birefringence effects and mounting difficulties that were not encountered using thin polymer films.

  14. Methods for forming particles from single source precursors

    DOE Patents [OSTI]

    Fox, Robert V. (Idaho Falls, ID); Rodriguez, Rene G. (Pocatello, ID); Pak, Joshua (Pocatello, ID)

    2011-08-23

    Single source precursors are subjected to carbon dioxide to form particles of material. The carbon dioxide may be in a supercritical state. Single source precursors also may be subjected to supercritical fluids other than supercritical carbon dioxide to form particles of material. The methods may be used to form nanoparticles. In some embodiments, the methods are used to form chalcopyrite materials. Devices such as, for example, semiconductor devices may be fabricated that include such particles. Methods of forming semiconductor devices include subjecting single source precursors to carbon dioxide to form particles of semiconductor material, and establishing electrical contact between the particles and an electrode.

  15. Oscillating and Static Universes from a Single Barotropic Fluid

    E-Print Network [OSTI]

    Kehayias, John

    2015-01-01

    We consider cosmological solutions to general relativity with a single barotropic fluid, where the pressure is a general function of the density, $p = f(\\rho)$. We derive conditions for static and oscillating solutions and provide examples, extending earlier work to these simpler and more general single-fluid cosmologies. Generically we expect such solutions to suffer from instabilities, through effects such as quantum fluctuations or tunneling to zero size. We also find a classical instability ("no-go" theorem) for oscillating solutions of a single barotropic perfect fluid due to a necessarily negative squared sound speed.

  16. Economical Quantum Secure Direct Communication Network with Single Photons

    E-Print Network [OSTI]

    Fu-Guo Deng; Xi-Han Li; Chun-Yan Li; Ping Zhou; Hong-Yu Zhou

    2007-12-13

    A scheme for quantum secure direct communication (QSDC) network is proposed with a sequence of polarized single photons. The single photons are prepared originally in the same state |0> by the servers on the network, which will reduce the difficulty for the legitimate users to check eavesdropping largely. The users code the information on the single photons with two unitary operations which do not change their measuring bases. Some decoy photons, which are produced by operating the sample photons with a Hadamard, are used for preventing a potentially dishonest server from eavesdropping the quantum lines freely. This scheme is an economical one as it is the easiest way for QSDC network communication securely.

  17. Method and device for measuring single-shot transient signals

    DOE Patents [OSTI]

    Yin, Yan

    2004-05-18

    Methods, apparatus, and systems, including computer program products, implementing and using techniques for measuring multi-channel single-shot transient signals. A signal acquisition unit receives one or more single-shot pulses from a multi-channel source. An optical-fiber recirculating loop reproduces the one or more received single-shot optical pulses to form a first multi-channel pulse train for circulation in the recirculating loop, and a second multi-channel pulse train for display on a display device. The optical-fiber recirculating loop also optically amplifies the first circulating pulse train to compensate for signal losses and performs optical multi-channel noise filtration.

  18. Coating Single-Walled Carbon Nanotubes with Tin Oxide

    E-Print Network [OSTI]

    Zettl, Alex

    , and Pt by electron-beam evaporation or electroless metal deposition.2,5,11 Single amine-functionalized CdSe, transparent coatings, heterojunction solar cells, and chemical sensors. The deposition techniques used for Sn

  19. Multiplexed photography : single-exposure capture of multiple camera settings

    E-Print Network [OSTI]

    Green, Paul Elijah

    2009-01-01

    The space of camera settings is large and individual settings can vary dramatically from scene to scene. This thesis explores methods for capturing and manipulating multiple camera settings in a single exposure. Multiplexing ...

  20. Electrothermal feedback in superconducting nanowire single-photon detectors

    E-Print Network [OSTI]

    Kerman, Andrew J.

    We investigate the role of electrothermal feedback in the operation of superconducting nanowire single-photon detectors (SNSPDs). It is found that the desired mode of operation for SNSPDs is only achieved if this feedback ...

  1. Membrane-integrated superconducting nanowire single-photon detectors

    E-Print Network [OSTI]

    Najafi, Faraz

    We integrated superconducting nanowire single-photon detectors on sub-400-nm-thick silicon nitride membranes, which can then be transferred and aligned to photonic structures on a secondary chip with sub-micron placement accuracy.

  2. Efficiently Coupling Light to Superconducting Nanowire Single-Photon Detectors

    E-Print Network [OSTI]

    Hu, Xiaolong

    We designed superconducting nanowire single-photon detectors (SNSPDs) integrated with silver optical antennae for free-space coupling and a dielectric waveguide for fiber coupling. According to our finite-element simulation, ...

  3. Superconducting-nanowire single-photon-detector linear array

    E-Print Network [OSTI]

    Zhao, Qingyuan

    We designed, fabricated, and tested a one-dimensional array of superconducting-nanowire single-photon detectors, integrated with on-chip inductors and resistors. The architecture is suitable for monolithic integration on ...

  4. Characterization of single photons using two-photon interference

    E-Print Network [OSTI]

    T. Legero; T. Wilk; A. Kuhn; G. Rempe

    2005-12-02

    Adiabatic passage techniques allow the generation of single photons which are very long compared to the typical detector time resolution. Therefore the detection time of a photon can be measured within the duration of the single-photon wavepacket. As a consequence, two-photon interference can be investigated in a time-resolved manner, i.e., the coincidence rate can be measured as a function of the time between photodetections. The theoretical analysis shows that this method not only gives information about the duration of single photons, but also about their coherence time. Here we discuss how to use this method for a spectral or temporal characterization of a single-photon source.

  5. Cavity Sideband Cooling of a Single Trapped Ion

    E-Print Network [OSTI]

    Vuletic, Vladan

    We report a demonstration and quantitative characterization of one-dimensional cavity cooling of a single trapped [superscript 88]Sr[superscript +] ion in the resolved-sideband regime. We measure the spectrum of cavity ...

  6. Functionalized nanopipettes: toward label-free, single cell biosensors

    E-Print Network [OSTI]

    Actis, Paolo; Mak, Andy C.; Pourmand, Nader

    2010-01-01

    label-free, single cell biosensors Paolo Actis & Andy C.1], carbon nanotube biosensors [2], nanowires [3], and nano-use of nano- pipettes as biosensors. The applications of

  7. Modeling and analysis of single-molecule experiments

    E-Print Network [OSTI]

    Witkoskie, James B

    2005-01-01

    Single molecule experiments offer a unique window into the molecular world. This window allows us to distinguish the behaviors of individual molecules from the behavior of bulk by observing rare events and heterogeneity ...

  8. School Of Mathematics and Statistics Single Honours Mathematics

    E-Print Network [OSTI]

    School Of Mathematics and Statistics Single Honours Mathematics BSc Mathematics MMath Mathematics BSc Financial Mathematics BSc Mathematics with French Language MMath Mathematics with French Language BSc Mathematics with German Language MMath Mathematics with German Language BSc Mathematics

  9. Experimental study of a single riser in waves and currents 

    E-Print Network [OSTI]

    Guerandel, Vincent Louis Pierre

    1994-01-01

    This research study focused on wave-current interaction with a single, flexible cylinder representative of a riser in 500 in (1640 ft) of water. Realistic environmental conditions were obtained by combining wave and current ...

  10. A Method for Evaluating Fire after Earthquake Scenarios for Single...

    Office of Environmental Management (EM)

    dissemination prohibited U N C L A S S I F I E D A Method for Evaluating Fire After Earthquake Scenarios for Single Buildings Elizabeth J. Kelly and Raymond N. Tell, LANL U.S....

  11. Discovery of a Single Topological Dirac Fermion in the Strong...

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

    a single layer of BiTeCl sheet, Fig. 3b, c ), making them promising materials for spintronic applications with both p- and n-type doping. Primary Citation: Y. L. Chen, M. Kanou,...

  12. Single-Degenerate Type Ia Supernovae Are Preferentially Overluminous

    E-Print Network [OSTI]

    Fisher, Robert

    2015-01-01

    Recent observational and theoretical progress has favored merging and helium-accreting sub-Chandrasekhar mass white dwarfs in the double-degenerate and the double-detonation channels, respectively, as the most promising progenitors of normal Type Ia supernovae (SNe Ia). Thus the fate of rapidly-accreting Chandrasekhar mass white dwarfs in the single-degenerate channel remains more mysterious then ever. In this paper, we clarify the nature of ignition in Chandrasekhar-mass single-degenerate SNe Ia by analytically deriving the existence of a characteristic length scale which establishes a transition from central ignitions to buoyancy-driven ignitions. Using this criterion, combined with data from three-dimensional simulations of convection and ignition, we demonstrate that the overwhelming majority of ignition events within Chandrasekhar-mass white dwarfs in the single-degenerate channel are buoyancy-driven, and consequently lack a vigorous deflagration phase. We thus infer that single-degenerate SNe Ia are gen...

  13. Single-valued periods and multiple zeta values

    E-Print Network [OSTI]

    Francis Brown

    2013-09-20

    The values at 1 of single-valued multiple polylogarithms span a certain subalgebra of multiple zeta values. In this paper, the properties of this algebra are studied from the point of view of motivic periods.

  14. Single-Electron Detection and Spectroscopy via Relativistic Cyclotron Radiation

    E-Print Network [OSTI]

    Asner, D.?M.

    It has been understood since 1897 that accelerating charges must emit electromagnetic radiation. Although first derived in 1904, cyclotron radiation from a single electron orbiting in a magnetic field has never been observed ...

  15. Free energy reconstruction from irreversible single- molecule pulling experiments

    E-Print Network [OSTI]

    Minh, David

    2007-01-01

    Free Energy Reconstruction from Irreversible Single-Molecule Pulling Experiments,” which was also a sourcefree energy reconstruction method [21, 22], as well as several extensions [39, 40]. The source ?

  16. Enzyme-Coated Carbon Nanotubes as Single-Molecule Biosensors

    E-Print Network [OSTI]

    Dekker, Cees

    with electron-beam lithography. The lowest device resistance that we observed was 25 k and the highest mobility studies and opens the way to biomolecular diagnostics. The unique electrical properties of single

  17. Single-Pair FRET Characterization of DNA Tweezers

    E-Print Network [OSTI]

    Ludwig-Maximilians-Universität, München

    Single-Pair FRET Characterization of DNA Tweezers Barbara K. Mu1ller, Andreas Reuter, Friedrich C-Champaign, 1110 West Green Street, Urbana, Illinois 61801 Received August 18, 2006; Revised Manuscript Received

  18. Microfluidics for biological measurements with single-molecule resolution

    E-Print Network [OSTI]

    Huang, Yanyi

    Microfluidics for biological measurements with single-molecule resolution§ Aaron M Streets1-molecule resolution in order to accurately recapitulate population distributions. Microfluidic technology has proven handling, small volume manipulation, and high throughput capabilities of microfluidic devices

  19. An economical single to three phase converter for induction motors 

    E-Print Network [OSTI]

    Di Zerega, Philp Van Uytandaele

    1994-01-01

    There are several different types of single to three phase converters for induction motors available today. However, many of the presently available phase converters suffer from disadvantages such as high cost or low performance. An economical...

  20. Single data set detection for multistatic doppler radar 

    E-Print Network [OSTI]

    Shtarkalev, Bogomil Iliev

    2015-06-29

    The aim of this thesis is to develop and analyse single data set (SDS) detection algorithms that can utilise the advantages of widely-spaced (statistical) multiple-input multiple-output (MIMO) radar to increase their ...

  1. Single-block collision attack on MD5 Marc Stevens

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Single-block collision attack on MD5 Marc Stevens Cryptology Group, CWI P.O. Box 94079, NL-1090 GB Amsterdam, The Netherlands marc@marc-stevens.nl January 29, 2012 Abstract In 2010, Tao Xie and Dengguo Feng

  2. Anisotropic Etching and Nanoribbon Formation in Single-Layer Graphene

    E-Print Network [OSTI]

    Campos, Leonardo

    We demonstrate anisotropic etching of single-layer graphene by thermally activated nickel nanoparticles. Using this technique, we obtain sub-10-nm nanoribbons and other graphene nanostructures with edges aligned along a ...

  3. Biexciton Quantum Yield of Single Semiconductor Nanocrystals from Photon Statistics

    E-Print Network [OSTI]

    Bawendi, Moungi G.

    Biexciton properties strongly affect the usability of a light emitter in quantum photon sources and lasers but are difficult to measure for single fluorophores at room temperature due to luminescence intermittency and ...

  4. Seismic Signal Processing for Single Well Imaging Applications 

    E-Print Network [OSTI]

    Walsh, Brendan

    2007-01-01

    This thesis focuses on the concept of Single Well Imaging (SWI) in which a seismic source and receivers are deployed in a borehole to investigate the surrounding geology. The Uniwell project (1997-1999) was the first ...

  5. Equilibrium Distribution of Mutators in the Single Fitness Peak Model

    E-Print Network [OSTI]

    Tannenbaum, Emmanuel; Deeds, Eric J.; Shakhnovich, Eugene I.

    2003-09-26

    This Letter develops an analytically tractable model for determining the equilibrium distribution of mismatch repair deficient strains in unicellular populations. The approach is based on the single fitness peak model, ...

  6. Synthesis and physical characterization of thermoelectric single crystals

    E-Print Network [OSTI]

    Porras Pérez Guerrero, Juan Pablo

    2012-01-01

    There is much current interest in thermoelectric devices for sustainable energy. This thesis describes a research project on the synthesis and physical characterization of thermoelectric single crystals. 1In?Se?-[delta] ...

  7. Actuator assembly including a single axis of rotation locking member

    DOE Patents [OSTI]

    Quitmeyer, James N.; Benson, Dwayne M.; Geck, Kellan P.

    2009-12-08

    An actuator assembly including an actuator housing assembly and a single axis of rotation locking member fixedly attached to a portion of the actuator housing assembly and an external mounting structure. The single axis of rotation locking member restricting rotational movement of the actuator housing assembly about at least one axis. The single axis of rotation locking member is coupled at a first end to the actuator housing assembly about a Y axis and at a 90.degree. angle to an X and Z axis providing rotation of the actuator housing assembly about the Y axis. The single axis of rotation locking member is coupled at a second end to a mounting structure, and more particularly a mounting pin, about an X axis and at a 90.degree. angle to a Y and Z axis providing rotation of the actuator housing assembly about the X axis. The actuator assembly is thereby restricted from rotation about the Z axis.

  8. Single P-N junction tandem photovoltaic device

    DOE Patents [OSTI]

    Walukiewicz, Wladyslaw (Kensington, CA); Ager, III, Joel W. (Berkeley, CA); Yu, Kin Man (Lafayette, CA)

    2011-10-18

    A single P-N junction solar cell is provided having two depletion regions for charge separation while allowing the electrons and holes to recombine such that the voltages associated with both depletion regions of the solar cell will add together. The single p-n junction solar cell includes an alloy of either InGaN or InAlN formed on one side of the P-N junction with Si formed on the other side in order to produce characteristics of a two junction (2J) tandem solar cell through only a single P-N junction. A single P-N junction solar cell having tandem solar cell characteristics will achieve power conversion efficiencies exceeding 30%.

  9. Single P-N junction tandem photovoltaic device

    DOE Patents [OSTI]

    Walukiewicz, Wladyslaw (Kensington, CA); Ager, III, Joel W. (Berkeley, CA); Yu, Kin Man (Lafayette, CA)

    2012-03-06

    A single P-N junction solar cell is provided having two depletion regions for charge separation while allowing the electrons and holes to recombine such that the voltages associated with both depletion regions of the solar cell will add together. The single p-n junction solar cell includes an alloy of either InGaN or InAlN formed on one side of the P-N junction with Si formed on the other side in order to produce characteristics of a two junction (2J) tandem solar cell through only a single P-N junction. A single P-N junction solar cell having tandem solar cell characteristics will achieve power conversion efficiencies exceeding 30%.

  10. Descriptive Quality Indicators Rating Scale for Single-case Design 

    E-Print Network [OSTI]

    Boles, Margot

    2015-04-08

    This table presents a rating scale for descriptive quality indicators in single-case research. This table is adapted from CEC (2014), Horner et al. (2005), and Reichow (2008)

  11. Quantitative Characterization of Filament Dynamics by Single-Molecule Lifetime

    E-Print Network [OSTI]

    Needleman, Daniel

    CHAPTER 29 Quantitative Characterization of Filament Dynamics by Single-Molecule Lifetime University, Cambridge, Massachusetts 02138 Abstract I. Introduction to Cytoskeletal Filament Dynamics II III. Theoretical Foundations A. Equivalence to the First-Passage Time Problem B. Models of Filament

  12. Multiple Query Probabilistic Roadmap Planning using Single Query Planning Primitives

    E-Print Network [OSTI]

    Chen, Brian Y.

    Multiple Query Probabilistic Roadmap Planning using Single Query Planning Primitives Kostas E query planners. Our implementation uses a probabilistic roadmap method (PRM) with bidirec- tional the strengths of both is obtained. The probabilistic roadmap method (PRM) approach to motion planning

  13. Exploring the mechanome with optical tweezers and single molecule fluorescence

    E-Print Network [OSTI]

    Brau, Ricardo R. (Ricardo Rafael), 1979-

    2008-01-01

    The combination of optical tweezers and single molecule fluorescence into an instrument capable of making combined, coincident measurements adds an observable dimension that allows for the examination of the localized ...

  14. Numerical simulation of a single wafer atomic layer deposition process

    E-Print Network [OSTI]

    Jones, A. Andrew D., III (Akhenaton-Andrew Dhafir)

    2010-01-01

    Atomic Layer Deposition (ALD) is a process used to deposit nanometer scale films for use in nano electronics. A typical experimental reactor consist of a warm wall horizontal flow tube, a single disc mounted halfway down ...

  15. Seeing the invisible : single molecule microscopy in the shortwave infrared

    E-Print Network [OSTI]

    Correa, Raoul Emile

    2013-01-01

    Infrared-active nanostructures play an increasingly important role in the nanoscience toolbox, yet little is known about their optical properties at the single nanoparticle level. In this thesis, we detail efforts to extend ...

  16. Stable Metal-Organic Frameworks Containing Single-Molecule Traps...

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

    Stable Metal-Organic Frameworks Containing Single-Molecule Traps for Enzyme Encapsulation Previous Next List Dawei Feng, Tian-Fu Liu, Jie Su, Mathieu Bosch, Zhangwen Wei, Wei Wan,...

  17. Isolating and moving single atoms using silicon nanocrystals

    DOE Patents [OSTI]

    Carroll, Malcolm S. (Albuquerque, NM)

    2010-09-07

    A method is disclosed for isolating single atoms of an atomic species of interest by locating the atoms within silicon nanocrystals. This can be done by implanting, on the average, a single atom of the atomic species of interest into each nanocrystal, and then measuring an electrical charge distribution on the nanocrystals with scanning capacitance microscopy (SCM) or electrostatic force microscopy (EFM) to identify and select those nanocrystals having exactly one atom of the atomic species of interest therein. The nanocrystals with the single atom of the atomic species of interest therein can be sorted and moved using an atomic force microscope (AFM) tip. The method is useful for forming nanoscale electronic and optical devices including quantum computers and single-photon light sources.

  18. Single-degree-of-freedom energy harvesters by stochastic excitation

    E-Print Network [OSTI]

    Joo, Han Kyul

    2014-01-01

    In this thesis, the performance criteria for the objective comparison of different classes of single-degree-of-freedom oscillators under stochastic excitation are developed. For each family of oscillators, these objective ...

  19. High-Throughput Single-Cell Manipulation in Brain Tissue

    E-Print Network [OSTI]

    Steinmeyer, Joseph Daly

    The complexity of neurons and neuronal circuits in brain tissue requires the genetic manipulation, labeling, and tracking of single cells. However, current methods for manipulating cells in brain tissue are limited to ...

  20. Nuclear magnetic resonance spectroscopy of single subnanoliter ova

    E-Print Network [OSTI]

    Grisi, Marco; Guidetti, Roberto; Harris, Nicola; Boero, Giovanni

    2015-01-01

    Nuclear magnetic resonance (NMR) spectroscopy is, in principle, a promising candidate to study the intracellular chemistry of single microscopic living entities. However, due to sensitivity limitations, NMR experiments were reported only on very few and relatively large single cells down to a minimum volume of 10 nl. Here we show NMR spectroscopy of single ova at volume scales (0.1 and 0.5 nl) where life development begins for a broad variety of animals, humans included. We demonstrate that the sensitivity achieved by miniaturized inductive NMR probes (few pmol of 1H nuclei in some hours at 7 T) is sufficient to observe chemical heterogeneities among subnanoliter ova of tardigrades. Such sensitivities should allow to non-invasively monitor variations of concentrated intracellular compounds, such as glutathione, in single mammalian zygotes.

  1. Minimalist Recovery Techniques for Single Event Effects in Spaceborne Microcontrollers

    E-Print Network [OSTI]

    Rennels, David A.

    on a single low-cost commodity chip containing a processor, program memory, RAM, discrete I/O, A/D converters other in rad-hard processes, such functions are * Also with the Jet Propulsion Laboratory, Pasadena, CA

  2. Transverse single-spin asymmetries: Challenges and recent progress

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

    Metz, Andreas; Pitonyak, Daniel; Schafer, Andreas; Schlegel, Marc; Vogelsang, Werner; Zhou, Jian

    2014-11-25

    In this study, transverse single-spin asymmetries are among the most intriguing observables in hadronic physics. Though such asymmetries were already measured for the first time about four decades ago, their origin is still under debate. Here we consider transverse single-spin asymmetries in semi-inclusive lepton–nucleon scattering, in nucleon–nucleon scattering, and in inclusive lepton–nucleon scattering. It is argued that, according to recent work, the single-spin asymmetries for those three processes may be simultaneously described in perturbative QCD, where the re-scattering of the active partons plays a crucial role. A comparison of single-spin asymmetries in different reactions can also shed light on themore »universality of transverse momentum dependent parton correlation functions. In particular, we discuss what existing data may tell us about the predicted process dependence of the Sivers function.« less

  3. Photoinduced phase transitions studied by femtosecond single-shot spectroscopy

    E-Print Network [OSTI]

    Shin, Taeho

    2010-01-01

    Single-shot femtosecond spectroscopy has been developed and employed for the study of phase transitions of solid-state materials. Using two crossed echelons, a two dimensional spatial delay gradient was generated across a ...

  4. Profit Centers, Single-Source Suppliers and Transaction Costs

    E-Print Network [OSTI]

    Walker, Gordon; Poppo, Laura

    1991-03-01

    for nonstandard organizations and markets. We apply the theory simultaneously to decentralized supply relationships in a manufacturing corporation and to the corporation's relationships with single-source suppliers. Our results support the core proposition...

  5. A Hierarchical Volumetric Shadow Algorithm for Single Scattering

    E-Print Network [OSTI]

    Baran, Ilya

    Volumetric effects such as beams of light through participating media are an important component in the appearance of the natural world. Many such effects can be faithfully modeled by a single scattering medium. In the ...

  6. Weight loss reduces breast ductal fluid estrogens in obese postmenopausal women: a single arm intervention pilot study

    E-Print Network [OSTI]

    2012-01-01

    postmenopausal women: a single arm intervention pilot studypostmenopausal women: a single arm intervention pilot study.

  7. Single-ring magnetic cusp low gas pressure ion source

    DOE Patents [OSTI]

    Bacon, Frank M. (Albuquerque, NM); Brainard, John P. (Albuquerque, NM); O'Hagan, James B. (Albuquerque, NM); Walko, Robert J. (Albuquerque, NM)

    1985-01-01

    A single-ring magnetic cusp low gas pressure ion source designed for use in a sealed, nonpumped neutron generator utilizes a cathode and an anode, three electrically floating electrodes (a reflector behind the cathode, a heat shield around the anode, and an aperture plate), together with a single ring-cusp magnetic field, to establish and energy-filtering mechanism for producing atomic-hydrogen ions.

  8. Optimal Storage and Retrieval of Single-Photon Waveforms

    E-Print Network [OSTI]

    Shuyu Zhou; Shanchao Zhang; Chang Liu; J. F. Chen; Jianming Wen; M. M. T. Loy; G. K. L. Wong; Shengwang Du

    2012-07-11

    We report an experimental demonstration of optimal storage and retrieval of heralded single-photon wave packets using electromagnetically induced transparency (EIT) in cold atoms at a high optical depth. We obtain an optimal storage efficiency of (49+/-3)% for single-photon waveforms with a temporal likeness of 96%. Our result brings the EIT quantum light-matter interface close to practical quantum information applications.

  9. Higgs Boson Decays into Single Photon plus Unparticle

    E-Print Network [OSTI]

    Kingman Cheung; Chong Sheng Li; Tzu-Chiang Yuan

    2007-11-21

    The decay of the standard model Higgs boson into a single photon and a vector unparticle through a one-loop process is studied. For an intermediate mass Higgs boson, this single photon plus unparticle mode can have a branching ratio comparable with the two-photon discovery mode. The emitted photon has a continuous energy spectrum encoding the nature of the recoil unparticle. It can be measured in precision studies of the Higgs boson after its discovery.

  10. Experiences in Large Grain-Single Crystal Cavity Fabrication

    SciTech Connect (OSTI)

    Pekeler, Michael; Schwellenbach, Johannes; Tradt, Marco

    2007-08-09

    At ACCEL instruments several single cell and 9-cell cavities have been produced out of large grain niobium sheets from different suppliers. The fabrication experience and difference to the production out of fine grain niobium sheets will be described. In addition two cavities were produced using single crystal niobium sheets. The final cavities showed no grain boundaries at all in the cavity cell, even not in the electron beam welding seam.

  11. The Omega-Infinity Limit of Single Spikes

    E-Print Network [OSTI]

    Minos Axenides; Emmanuel Floratos; Georgios Linardopoulos

    2015-11-11

    A new infinite-size limit of strings in RxS2 is presented. The limit is obtained from single spike strings by letting their angular velocity omega become infinite. We derive the energy-momenta relation of omega-infinity single spikes as their linear velocity v-->1 and their angular momentum J-->1. Generally, the v-->1, J-->1 limit of single spikes is singular and has to be excluded from the spectrum and be studied separately. We discover that the dispersion relation of omega-infinity single spikes contains logarithms in the limit J-->1. This result is somewhat surprising, since the logarithmic behavior in the string spectra is typically associated with their motion in non-compact spaces such as AdS. Omega-infinity single spikes seem to completely cover the surface of the 2-sphere they occupy, so that they may essentially be viewed as some sort of "brany strings". A proof of the sphere-filling property of omega-infinity single spikes is given in the appendix.

  12. The Omega-Infinity Limit of Single Spikes

    E-Print Network [OSTI]

    Axenides, Minos; Linardopoulos, Georgios

    2015-01-01

    A new infinite-size limit of strings in RxS2 is presented. The limit is obtained from single spike strings by letting their angular velocity omega become infinite. We derive the energy-momenta relation of omega-infinity single spikes as their linear velocity v-->1 and their angular momentum J-->1. Generally, the v-->1, J-->1 limit of single spikes is singular and has to be excluded from the spectrum and be studied separately. We discover that the dispersion relation of omega-infinity single spikes contains logarithms in the limit J-->1. This result is somewhat surprising, since the logarithmic behavior in the string spectra is typically associated with their motion in non-compact spaces such as AdS. Omega-infinity single spikes seem to completely cover the surface of the 2-sphere they occupy, so that they may essentially be viewed as some sort of "brany strings". A proof of the sphere-filling property of omega-infinity single spikes is given in the appendix.

  13. Effect of Loss on Multiplexed Single-Photon Sources

    E-Print Network [OSTI]

    Damien Bonneau; Gabriel J. Mendoza; Jeremy L. O'Brien; Mark G. Thompson

    2015-04-29

    An on-demand single-photon source is a key requirement for scaling many optical quantum technologies. A promising approach to realize an on-demand single-photon source is to multiplex an array of heralded single-photon sources using an active optical switching network. However, the performance of multiplexed sources is degraded by photon loss in the optical components and the non-unit detection efficiency of the heralding detectors. We provide a theoretical description of a general multiplexed single-photon source with lossy components and derive expressions for the output probabilities of single-photon emission and multi-photon contamination. We apply these expressions to three specific multiplexing source architectures and consider their tradeoffs in design and performance. To assess the effect of lossy components on near- and long-term experimental goals, we simulate the multiplexed sources when used for many-photon state generation under various amounts of component loss. We find that with a multiplexed source composed of switches with ~0.2-0.4 dB loss and high efficiency number-resolving detectors, a single-photon source capable of efficiently producing 20-40 photon states with low multi-photon contamination is possible, offering the possibility of unlocking new classes of experiments and technologies.

  14. Single crystal Processing and magnetic properties of gadolinium nickel

    SciTech Connect (OSTI)

    Shreve, Andrew John [Ames Laboratory

    2012-11-02

    GdNi is a rare earth intermetallic material that exhibits very interesting magnetic properties. Spontaneous magnetostriction occurs in GdNi at T{sub C}, on the order of 8000ppm strain along the c-axis and only until very recently the mechanism causing this giant magnetostriction was not understood. In order to learn more about the electronic and magnetic structure of GdNi, single crystals are required for anisotropic magnetic property measurements. Single crystal processing is quite challenging for GdNi though since the rare-earth transition-metal composition yields a very reactive intermetallic compound. Many crystal growth methods are pursued in this study including crucible free methods, precipitation growths, and specially developed Bridgman crucibles. A plasma-sprayed Gd{sub 2}O{sub 3} W-backed Bridgman crucible was found to be the best means of GdNi single crystal processing. With a source of high-quality single crystals, many magnetization measurements were collected to reveal the magnetic structure of GdNi. Heat capacity and the magnetocaloric effect are also measured on a single crystal sample. The result is a thorough report on high quality single crystal processing and the magnetic properties of GdNi.

  15. Nanoscale optical positioning of single quantum dots for bright, pure, and on-demand single-photon emission

    E-Print Network [OSTI]

    Sapienza, Luca; Badolato, Antonio; Srinivasan, Kartik

    2015-01-01

    Self-assembled, epitaxially-grown InAs/GaAs quantum dots are promising semiconductor quantum emitters that can be integrated on a chip for a variety of photonic quantum information science applications. However, self-assembled growth results in an essentially random in-plane spatial distribution of quantum dots, presenting a challenge in creating devices that exploit the strong interaction of single quantum dots with highly confined optical modes. Here, we present a photoluminescence imaging approach for locating single quantum dots with respect to alignment features with an average (minimum) position uncertainty < 30 nm (< 10 nm), which represents an enabling technology for the creation of optimized single quantum dot devices. To that end, we create quantum dot single-photon sources, based on a circular Bragg grating geometry, that simultaneously exhibit high collection efficiency (48 % +/- 5 % into a 0.4 numerical aperture lens, close to the theoretically predicted value of 50 %), low multiphoton prob...

  16. Near optimal single photon sources in the solid state

    E-Print Network [OSTI]

    N. Somaschi; V. Giesz; L. De Santis; J. C. Loredo; M. P. Almeida; G. Hornecker; S. L. Portalupi; T. Grange; C. Anton; J. Demory; C. Gomez; I. Sagnes; N. D. Lanzillotti Kimura; A. Lemaitre; A. Auffeves; A. G. White; L. Lanco; P. Senellart

    2015-10-26

    Single-photons are key elements of many future quantum technologies, be it for the realisation of large-scale quantum communication networks for quantum simulation of chemical and physical processes or for connecting quantum memories in a quantum computer. Scaling quantum technologies will thus require efficient, on-demand, sources of highly indistinguishable single-photons. Semiconductor quantum dots inserted in photonic structures are ultrabright single photon sources, but the photon indistinguishability is limited by charge noise induced by nearby surfaces. The current state of the art for indistinguishability are parametric down conversion single-photon sources, but they intrinsically generate multiphoton events and hence must be operated at very low brightness to maintain high single photon purity. To date, no technology has proven to be capable of providing a source that simultaneously generates near-unity indistinguishability and pure single photons with high brightness. Here, we report on such devices made of quantum dots in electrically controlled cavity structures. We demonstrate on-demand, bright and ultra-pure single photon generation. Application of an electrical bias on deterministically fabricated devices is shown to fully cancel charge noise effects. Under resonant excitation, an indistinguishability of $0.9956\\pm0.0045$ is evidenced with a $g^{2}(0)=0.0028\\pm0.0012$. The photon extraction of $65%$ and measured brightness of $0.154\\pm0.015$ make this source $20$ times brighter than any source of equal quality. This new generation of sources open the way to a new level of complexity and scalability in optical quantum manipulation.

  17. Quantum to Classical Transition in a Single-Ion Laser

    E-Print Network [OSTI]

    François Dubin; Carlos Russo; Helena G. Barros; Andreas Stute; Christoph Becher; Piet O. Schmidt; Rainer Blatt

    2010-02-18

    Stimulated emission of photons from a large number of atoms into the mode of a strong light field is the principle mechanism for lasing in "classical" lasers. The onset of lasing is marked by a threshold which can be characterised by a sharp increase in photon flux as a function of external pumping strength. The same is not necessarily true for the fundamental building block of a laser: a single trapped atom interacting with a single optical radiation mode. It has been shown that such a "quantum" laser can exhibit thresholdless lasing in the regime of strong coupling between atom and radiation field. However, although theoretically predicted, a threshold at the single-atom level could not be experimentally observed so far. Here, we demonstrate and characterise a single-atom laser with and without threshold behaviour by changing the strength of atom-light field coupling. We observe the establishment of a laser threshold through the accumulation of photons in the optical mode even for a mean photon number substantially lower than for the classical case. Furthermore, self-quenching occurs for very strong external pumping and constitutes an intrinsic limitation of single-atom lasers. Moreover, we find that the statistical properties of the emitted light can be adjusted for weak external pumping, from the quantum to the classical domain. Our observations mark an important step towards fundamental understanding of laser operation in the few-atom limit including systems based on semiconductor quantum dots or molecules.

  18. Universal Single-Server Blind Quantum Computation for Classical Client

    E-Print Network [OSTI]

    Hai-Ru Xu; Bang-Hai Wang

    2014-11-12

    Blind quantum computation allows a client without enough quantum technologies to delegate her quantum computation to quantum server, while keeping her input, output and algorithm secure. In this paper, we propose a universal single-server and classical-client blind quantum computation protocol based on entanglement swapping technology. In our protocol, the client interface with only one server and the only ability of the client requires is to get particles from trusted center and forward them to the server. Moreover, the protocol can be modified to make client completely classical by improving the ability of the trusted center. Numbers of blind quantum computation protocols have been presented in recent years, including single-, double- and triple-server protocols. In the single-server protocol, client needs to prepare single qubits. Though client can be classical in the double-server protocol, the two servers, who share Bell state from trusted center, are not allowed to communicate with each other. Recently, the triple-server protocol solves the noncommunication problem. Three servers, however, make the implementation of the computation sophisticated and unrealistic. Since it is impossible for blind quantum computation with only classical client and single server, blind quantum computation may work in the "Cloud + E-commerce" style in the future. Our protocol might become a key ingredient for real-life application in the first generation of quantum computations.

  19. Single-well Low Temperature CO2- based Engineered Geothemal System...

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

    Single-well Low Temperature CO2- based Engineered Geothemal System Single-well Low Temperature CO2- based Engineered Geothemal System Single-well Low Temperature CO2- based...

  20. Mechanical seal having a single-piece, perforated mating ring

    DOE Patents [OSTI]

    Khonsari, Michael M. (Baton Rouge, LA); Somanchi, Anoop K. (Fremont, CA)

    2007-08-07

    A mechanical seal (e.g., single mechanical seals, double mechanical seals, tandem mechanical seals, bellows, pusher mechanical seals, and all types of rotating and reciprocating machines) with reduced contact surface temperature, reduced contact surface wear, or increased life span. The mechanical seal comprises a rotating ring and a single-piece, perforated mating ring, which improves heat transfer by controllably channeling coolant flow through the single-piece mating ring such that the coolant is in substantially uniform thermal contact with a substantial portion of the interior surface area of the seal face, while maintaining the structural integrity of the mechanical seal and minimizing the potential for coolant flow interruptions to the seal face caused by debris or contaminants (e.g., small solids and trash) in the coolant.

  1. Operation and biasing for single device equivalent to CMOS

    DOE Patents [OSTI]

    Welch, James D. (10328 Pinehurst Ave., Omaha, NE 68124)

    2001-01-01

    Disclosed are semiconductor devices including at least one junction which is rectifying whether the semiconductor is caused to be N or P-type, by the presence of field induced carriers. In particular, inverting and non-inverting gate voltage channel induced semiconductor single devices with operating characteristics similar to conventional multiple device CMOS systems, which can be operated as modulators, are disclosed as are a non-latching SCR and an approach to blocking parasitic currents. Operation of the gate voltage channel induced semiconductor single devices with operating characteristics similar to multiple device CMOS systems under typical bias schemes is described, and simple demonstrative five mask fabrication procedures for the inverting and non-inverting gate voltage channel induced semiconductor single devices with operating characteristics similar to multiple device CMOS systems are also presented.

  2. Study of narrowband single photon emitters in polycrystalline diamond films

    SciTech Connect (OSTI)

    Sandstrom, Russell G.; Shimoni, Olga; Martin, Aiden A.; Aharonovich, Igor, E-mail: igor.aharonovich@uts.edu.au [School of Physics and Advanced Materials, University of Technology, Sydney, P.O. Box 123, Broadway, New South Wales 2007 (Australia)

    2014-11-03

    Quantum information processing and integrated nanophotonics require robust generation of single photon emitters on demand. In this work, we demonstrate that diamond films grown on a silicon substrate by microwave plasma chemical vapor deposition can host bright, narrowband single photon emitters in the visible—near infra-red spectral range. The emitters possess fast lifetime (?several ns), absolute photostability, and exhibit full polarization at excitation and emission. Pulsed and continuous laser excitations confirm their quantum behaviour at room temperature, while low temperature spectroscopy is performed to investigate inhomogeneous broadening. Our results advance the knowledge of solid state single photon sources and open pathways for their practical implementation in quantum communication and quantum information processing.

  3. Superconducting single photon detectors integrated with diamond nanophotonic circuits

    E-Print Network [OSTI]

    Rath, Patrik; Ferrari, Simone; Sproll, Fabian; Lewes-Malandrakis, Georgia; Brink, Dietmar; Ilin, Konstantin; Siegel, Michael; Nebel, Christoph; Pernice, Wolfram

    2015-01-01

    Photonic quantum technologies promise to repeat the success of integrated nanophotonic circuits in non-classical applications. Using linear optical elements, quantum optical computations can be performed with integrated optical circuits and thus allow for overcoming existing limitations in terms of scalability. Besides passive optical devices for realizing photonic quantum gates, active elements such as single photon sources and single photon detectors are essential ingredients for future optical quantum circuits. Material systems which allow for the monolithic integration of all components are particularly attractive, including III-V semiconductors, silicon and also diamond. Here we demonstrate nanophotonic integrated circuits made from high quality polycrystalline diamond thin films in combination with on-chip single photon detectors. Using superconducting nanowires coupled evanescently to travelling waves we achieve high detection efficiencies up to 66 % combined with low dark count rates and timing resolu...

  4. Suitability versus fidelity for rating single-photon guns

    E-Print Network [OSTI]

    George M. Hockney; Pieter Kok; Jonathan P. Dowling

    2003-04-01

    The creation of specified quantum states is important for most, if not all, applications in quantum computation and communication. The quality of the state preparation is therefore an essential ingredient in any assessment of a quantum-state gun. We show that the fidelity, under the standard definitions is not sufficient to assess quantum sources, and we propose a new measure of suitability that necessarily depends on the application for the source. We consider the performance of single-photon guns in the context of quantum key distribution (QKD) and linear optical quantum computation. Single-photon sources for QKD need radically different properties than sources for quantum computing. Furthermore, the suitability for single-photon guns is discussed explicitly in terms of experimentally accessible criteria.

  5. Persistence of Single Spin Coherence above 600K in Diamond

    E-Print Network [OSTI]

    Toyli, D M; Alkauskas, A; Buckley, B B; Van de Walle, C G; Awschalom, D D

    2012-01-01

    We study the spin and orbital dynamics of single nitrogen vacancy (NV) centers in diamond between room temperature and 700 K. We find that the ability to optically address and coherently control single spins above room temperature is limited by nonradiative processes that quench the NV center's fluorescence-based spin readout between 550 K and 700 K. Combined with electronic structure calculations, our measurements indicate that the energy difference between the 3E and 1A1 electronic states is approximately 0.8 eV. We also find that the inhomogeneous spin lifetime (T2*) is independent of temperature up to at least 625 K, suggesting that single NV centers could be applied as nanoscale thermometers over a broad temperature range.

  6. Single transmission line interrogated multiple channel data acquisition system

    DOE Patents [OSTI]

    Fasching, George E. (Morgantown, WV); Keech, Jr., Thomas W. (Morgantown, WV)

    1980-01-01

    A single transmission line interrogated multiple channel data acquisition system is provided in which a plurality of remote station/sensor circuits each monitors a specific process variable and each transmits measurement values over a single transmission line to a master interrogating station when addressed by said master interrogating station. Typically, as many as 330 remote stations may be parallel connected to the transmission line which may exceed 7,000 feet. The interrogation rate is typically 330 stations/second. The master interrogating station samples each station according to a shared, charging transmit-receive cycle. All remote station address signals, all data signals from the remote stations/sensors and all power for all of the remote station/sensors are transmitted via a single continuous terminated coaxial cable. A means is provided for periodically and remotely calibrating all remote sensors for zero and span. A provision is available to remotely disconnect any selected sensor station from the main transmission line.

  7. FOREVER ALONE? TESTING SINGLE ECCENTRIC PLANETARY SYSTEMS FOR MULTIPLE COMPANIONS

    SciTech Connect (OSTI)

    Wittenmyer, Robert A.; Horner, Jonathan; Tinney, C. G.; Bailey, J.; Salter, G. S.; Wright, D.; Wang Songhu; Zhou Jilin; Butler, R. P.; Jones, H. R. A.; O'Toole, S. J.; Carter, B. D.

    2013-09-15

    Determining the orbital eccentricity of an extrasolar planet is critically important for understanding the system's dynamical environment and history. However, eccentricity is often poorly determined or entirely mischaracterized due to poor observational sampling, low signal-to-noise, and/or degeneracies with other planetary signals. Some systems previously thought to contain a single, moderate-eccentricity planet have been shown, after further monitoring, to host two planets on nearly circular orbits. We investigate published apparent single-planet systems to see if the available data can be better fit by two lower-eccentricity planets. We identify nine promising candidate systems and perform detailed dynamical tests to confirm the stability of the potential new multiple-planet systems. Finally, we compare the expected orbits of the single- and double-planet scenarios to better inform future observations of these interesting systems.

  8. Microwave guiding in air along single femtosecond laser filament

    SciTech Connect (OSTI)

    Ren Yu; Alshershby, Mostafa; Qin Jiang; Hao Zuoqiang; Lin Jingquan

    2013-03-07

    Microwave guiding along single plasma filament generated through the propagation of femtosecond (fs) laser pulses in air has been demonstrated over a distance of about 6.5 cm, corresponding to a microwave signal intensity enhancement of more than 3-fold over free space propagation. The current propagation distance along the fs laser filament is in agreement with the calculations and limited by the relatively high resistance of the single plasma filament. Using a single fs laser filament to channel microwave radiation considerably alleviate requirements to the power of fs laser pulses compared to the case of the circular filaments waveguide. In addition, it can be used as a simple and non-intrusive method to obtain the basic parameters of laser-generated plasma filament.

  9. Few-photon coherent nonlinear optics with a single molecule

    E-Print Network [OSTI]

    Maser, Andreas; Utikal, Tobias; Götzinger, Stephan; Sandoghdar, Vahid

    2015-01-01

    The pioneering experiments of linear spectroscopy were performed using flames in the 1800s, but nonlinear optical measurements had to wait until lasers became available in the twentieth century. Because the nonlinear cross section of materials is very small, usually macroscopic bulk samples and pulsed lasers are used. Numerous efforts have explored coherent nonlinear signal generation from individual nanoparticles or small atomic ensembles with millions of atoms. Experiments on a single semiconductor quantum dot have also been reported, albeit with a very small yield. Here, we report on coherent nonlinear spectroscopy of a single molecule under continuous-wave single-pass illumination, where efficient photon-molecule coupling in a tight focus allows switching of a laser beam by less than a handful of pump photons nearly resonant with the sharp molecular transition. Aside from their fundamental importance, our results emphasize the potential of organic molecules for applications such as quantum information pro...

  10. Photonic Quantum Logic with Narrowband Light from Single Atoms

    E-Print Network [OSTI]

    Annemarie Holleczek; Oliver Barter; Allison Rubenok; Jerome Dilley; Peter B. R. Nisbet-Jones; Gunnar Langfahl-Klabes; Graham D. Marshall; Chris Sparrow; Jeremy L. O'Brien; Konstantinos Poulios; Axel Kuhn; Jonathan C. F. Matthews

    2015-08-13

    Increasing control of single photons enables new applications of photonic quantum-enhanced technology and further experimental exploration of fundamental quantum phenomena. Here, we demonstrate quantum logic using narrow linewidth photons that are produced under nearly perfect quantum control from a single ^87Rb atom strongly coupled to a high-finesse cavity. We use a controlled- NOT gate integrated into a photonic chip to entangle these photons, and we observe non-classical correlations between events separated by periods exceeding the travel time across the chip by three orders of magnitude. This enables quantum technology that will use the properties of both narrowband single photon sources and integrated quantum photonics, such as networked quantum computing, narrow linewidth quantum enhanced sensing and atomic memories.

  11. Performance requirements for the single-shell tank

    SciTech Connect (OSTI)

    GRENARD, C.E.

    1999-09-22

    This document provides performance requirements for the waste storage and waste feed delivery functions of the Single-Shell Tank (SST) System. The requirements presented here in will be used as a basis for evaluating the ability of the system to complete the single-shell tank waste feed delivery mission. They will also be used to select the technology or technologies for retrieving waste from the tanks selected for the single-shell tank waste feed delivery mission, assumed to be 241-C-102 and 241-C-104. This revision of the Performance Requirements for the SST is based on the findings of the SST Functional Analysis, and are reflected in the current System Specification for the SST System.

  12. Measurement of Single-top Quark Production with ATLAS Data

    E-Print Network [OSTI]

    J. L. Holzbauer; for the ATLAS Collaboration

    2011-11-14

    Single-top production processes have been studied using 0.7 fb-1 of data from 7 TeV center-of-mass energy proton-proton collisions collected with the ATLAS detector at the LHC. Single-top is electroweak top production and the standard model includes three production modes. Each contains a Wtb vertex, allowing the possibility of a direct measurement of the CKM matrix element |Vtb|. Single-top could also be sensitive to new physics, such as flavor changing neutral currents or heavy W' bosons. Using cut-based selections, a limit of production and production. For the t-channel measurement, both cut-based and neural network analyses are performed and the cross-section is measured to be 90 +32 -22 pb, where 65 +28 -19 pb is expected according to standard model.

  13. Self-seeded single-frequency laser peening method

    DOE Patents [OSTI]

    DAne, C.Brent; Hackey, Lloyd A.; Harris, Fritz B.

    2012-06-26

    A method of operating a laser to obtain an output pulse having a single wavelength, comprises inducing an intracavity loss into a laser resonator having an amount that prevents oscillation during a time that energy from the pump source is being stored in the gain medium. Gain is built up in the gain medium with energy from the pump source until formation of a single-frequency relaxation oscillation pulse in the resonator. Upon detection of the onset of the relaxation oscillation pulse, the intracavity loss is reduced, such as by Q-switching, so that the built-up gain stored in the gain medium is output from the resonator in the form of an output pulse at a single frequency. An electronically controllable output coupler is controlled to affect output pulse characteristics. The laser acts a master oscillator in a master oscillator power amplifier configuration. The laser is used for laser peening.

  14. Self-seeded single-frequency laser peening method

    DOE Patents [OSTI]

    Dane, C. Brent (Livermore, CA); Hackel, Lloyd (Livermore, CA); Harris, Fritz B. (Rocklin, CA)

    2009-08-11

    A method of operating a laser to obtain an output pulse having a single wavelength, comprises inducing an intracavity loss into a laser resonator having an amount that prevents oscillation during a time that energy from the pump source is being stored in the gain medium. Gain is built up in the gain medium with energy from the pump source until formation of a single-frequency relaxation oscillation pulse in the resonator. Upon detection of the onset of the relaxation oscillation pulse, the intracavity loss is reduced, such as by Q-switching, so that the built-up gain stored in the gain medium is output from the resonator in the form of an output pulse at a single frequency. An electronically controllable output coupler is controlled to affect output pulse characteristics. The laser acts a master oscillator in a master oscillator power amplifier configuration. The laser is used for laser peening.

  15. Single particle electrochemical sensors and methods of utilization

    DOE Patents [OSTI]

    Schoeniger, Joseph (Oakland, CA); Flounders, Albert W. (Berkeley, CA); Hughes, Robert C. (Albuquerque, NM); Ricco, Antonio J. (Los Gatos, CA); Wally, Karl (Lafayette, CA); Kravitz, Stanley H. (Placitas, NM); Janek, Richard P. (Oakland, CA)

    2006-04-04

    The present invention discloses an electrochemical device for detecting single particles, and methods for using such a device to achieve high sensitivity for detecting particles such as bacteria, viruses, aggregates, immuno-complexes, molecules, or ionic species. The device provides for affinity-based electrochemical detection of particles with single-particle sensitivity. The disclosed device and methods are based on microelectrodes with surface-attached, affinity ligands (e.g., antibodies, combinatorial peptides, glycolipids) that bind selectively to some target particle species. The electrodes electrolyze chemical species present in the particle-containing solution, and particle interaction with a sensor element modulates its electrolytic activity. The devices may be used individually, employed as sensors, used in arrays for a single specific type of particle or for a range of particle types, or configured into arrays of sensors having both these attributes.

  16. W and Anomalous Single Top Production at HERA

    E-Print Network [OSTI]

    E. Rizvi; for the H1 Collabortion

    2008-07-22

    The analysis of $W$ production and the search for anomalous single top production is performed with the H1 detector at HERA with an integrated luminosity of 0.5 fb$^{-1}$, consisting of the complete high energy data from the HERA programme. Production cross section measurements of single $W$ production, as well as $W$ polarisation fractions in events containing isolated leptons and missing transverse momentum are also presented. In the context of a search for single top production an upper limit on the top production cross section $\\sigma_{ep\\to etX} < 0.16$ pb is established at the 95% confidence level, corresponding to an upper bound on the anomalous magnetic coupling $\\kappa_{tu\\gamma} < 0.14$.

  17. Growing intermetallic single crystals using in situ decanting

    SciTech Connect (OSTI)

    Petrovic, Cedomir; Canfield, Paul; Mellen, Jonathan

    2012-05-16

    High temperature metallic solution growth is one of the most successful and versatile methods for single crystal growth, and is particularly suited for exploratory synthesis. The method commonly utilizes a centrifuge at room temperature and is very successful for the synthesis of single crystal phases that can be decanted from the liquid below the melting point of the silica ampoule. In this paper, we demonstrate the extension of this method that enables single crystal growth and flux decanting inside the furnace at temperatures above 1200°C. This not only extends the number of available metallic solvents that can be used in exploratory crystal growth but also can be particularly well suited for crystals that have a rather narrow exposed solidification surface in the equilibrium alloy phase diagram.

  18. Environmental genomics reveals a single species ecosystem deep within the Earth

    E-Print Network [OSTI]

    Chivian, Dylan

    2008-01-01

    Environmental genomics reveals a single species ecosystemMaterial for Environmental genomics reveals a single speciesTechnology Program, DOE Joint Genomics Institute, Berkeley,

  19. Protein-Nanocrystal Conjugates Support a Single Filament Polymerization Model in R1 Plasmid Segregation

    E-Print Network [OSTI]

    Choi, Charina L.

    2008-01-01

    conjugates support a single filament polymerization model inwidth for single ParM filaments. Figure 4. Multiconjugatecontaining multiple ParM filaments. (A) Multiconjugate parC-

  20. Apparatus And Method For Producing Single Crystal Metallic Objects

    DOE Patents [OSTI]

    Huang, Shyh-Chin (Latham, NY); Gigliotti, Jr., Michael Francis X. (Scotia, NY); Rutkowski, Stephen Francis (Duanesburg, NY); Petterson, Roger John (Fultonville, NY); Svec, Paul Steven (Scotia, NY)

    2006-03-14

    A mold is provided for enabling casting of single crystal metallic articles including a part-defining cavity, a sorter passage positioned vertically beneath and in fluid communication with the part-defining cavity, and a seed cavity positioned vertically beneath and in fluid communication with the sorter passage. The sorter passage includes a shape suitable for encouraging a single crystal structure in solidifying molten metal. Additionally, a portion of the mold between the sorter passage and the part-defining cavity includes a notch for facilitating breakage of a cast article proximate the notch during thermal stress build-up, so as to prevent mold breakage or the inclusion of part defects.

  1. The statistics of single molecule detection: An overview

    SciTech Connect (OSTI)

    Enderlein, J.; Robbins, D.L.; Ambrose, W.P.

    1995-12-31

    An overview of our recent results in modeling single molecule detection in fluid flow is presented. Our mathematical approach is based on a path integral representation. The model accounts for all experimental details, such as light collection, laser excitation, hydrodynamics and diffusion, and molecular photophysics. Special attention is paid to multiple molecule crossings through the detection volume. Numerical realization of the theory is discussed. Measurements of burst size distributions in single B-phycoerythrin molecule detection experiments are presented and compared with theoretical predictions.

  2. Wavelength meter having single mode fiber optics multiplexed inputs

    DOE Patents [OSTI]

    Hackel, Richard P. (Livermore, CA); Paris, Robert D. (San Ramon, CA); Feldman, Mark (Pleasanton, CA)

    1993-01-01

    A wavelength meter having a single mode fiber optics input is disclosed. The single mode fiber enables a plurality of laser beams to be multiplexed to form a multiplexed input to the wavelength meter. The wavelength meter can provide a determination of the wavelength of any one or all of the plurality of laser beams by suitable processing. Another aspect of the present invention is that one of the laser beams could be a known reference laser having a predetermined wavelength. Hence, the improved wavelength meter can provide an on-line calibration capability with the reference laser input as one of the plurality of laser beams.

  3. Separating and combining single-mode and multimode optical beams

    DOE Patents [OSTI]

    Ruggiero, Anthony J; Masquelier, Donald A; Cooke, Jeffery B; Kallman, Jeffery S

    2013-11-12

    Techniques for combining initially separate single mode and multimode optical beams into a single "Dual Mode" fiber optic have been developed. Bi-directional propagation of two beams that are differentiated only by their mode profiles (i.e., wavefront conditions) is provided. The beams can be different wavelengths and or contain different modulation information but still share a common aperture. This method allows the use of conventional micro optics and hybrid photonic packaging techniques to produce small rugged packages suitable for use in industrial or military environments.

  4. SINGLE CRYSTAL NIOBIUM TUBES FOR PARTICLE COLLIDERS ACCELERATOR CAVITIES

    SciTech Connect (OSTI)

    MURPHY, JAMES E

    2013-02-28

    The objective of this research project is to produce single crystal niobium (Nb) tubes for use as particle accelerator cavities for the Fermi laboratory’s International Linear Collider project. Single crystal Nb tubes may have superior performance compared to a polycrystalline tubes because the absence of grain boundaries may permit the use of higher accelerating voltages. In addition, Nb tubes that are subjected to the high temperature, high vacuum crystallization process are very pure and well annealed. Any impurity with a significantly higher vapor pressure than Nb should be decreased by the relatively long exposure at high temperature to the high vacuum environment. After application of the single crystal process, the surfaces of the Nb tubes are bright and shiny, and the tube resembles an electro polished Nb tube. For these reasons, there is interest in single crystal Nb tubes and in a process that will produce single crystal tubes. To convert a polycrystalline niobium tube into a single crystal, the tube is heated to within a few hundred ?C of the melting temperature of niobium, which is 2477 ?C. RF heating is used to rapidly heat the tube in a narrow zone and after reaching the operating temperature, the hot zone is slowly passed along the length of the tube. For crystallization tests with Nb tubes, the traverse rate was in the range of 1-10 cm per hour. All the crystallization tests in this study were performed in a water-cooled, stainless steel chamber under a vacuum of 5 x10-6 torr or better. In earliest tests of the single crystal growth process, the Nb tubes had an OD of 1.9 cm and a wall thickness of 0.15 mm. With these relatively small Nb tubes, the single crystal process was always successful in producing single crystal tubes. In these early tests, the operating temperature was normally maintained at 2200 ?C, and the traverse rate was 5 cm per hour. In the next test series, the Nb tube size was increased to 3.8 cm OD and the wall thickness was increased 0.18 mm and eventually to 0.21 mm. Again, with these larger tubes, single crystal tubes were usually produced by the crystallization process. The power supply was generally operated at full output during these tests, and the traverse rate was 5 cm per hour. In a few tests, the traverse rate was increased to 10 cm per hour, and at the faster traverse rate, single crystal growth was not achieved. In these tests with a faster traverse rate, it was thought that the tube was not heated to a high enough temperature to achieve single crystal growth. In the next series of tests, the tube OD was unchanged at 3.8 cm and the wall thickness was increased to 0.30 mm. The increased wall thickness made it difficult to reach an operating temperature above 2,000 ?C, and although the single crystal process caused a large increase in the crystal grains, no single crystal tubes were produced. It was assumed that the operating temperature in these tests was not high enough to achieve single crystal growth. In FY 2012, a larger power supply was purchased and installed. With the new power supply, temperatures above the melting point of Nb were easily obtained regardless of the tube thickness. A series of crystallization tests was initiated to determine if indeed the operating temperature of the previous tests was too low to achieve single crystal growth. For these tests, the Nb tube OD remained at 3.8 cm and the wall thickness was 0.30 mm. The first test had an operating temperature of 2,000 ?C. and the operating temperature was increased by 50 ?C increments for each successive test. The final test was very near the Nb melting temperature, and indeed, the Nb tube eventually melted in the center of the tube. These tests showed that higher temperatures did yield larger grain sizes if the traverse rate was held constant at 5 cm per hour, but no single crystal tubes were produced even at the highest operating temperature. In addition, slowing the traverse rate to as low as 1 cm per hour did not yield a single crystal tube regardless of operating temperature. At this time, it

  5. Efficient room-temperature source of polarized single photons

    DOE Patents [OSTI]

    Lukishova, Svetlana G. (Honeoye Falls, NY); Boyd, Robert W. (Rochester, NY); Stroud, Carlos R. (Rochester, NY)

    2007-08-07

    An efficient technique for producing deterministically polarized single photons uses liquid-crystal hosts of either monomeric or oligomeric/polymeric form to preferentially align the single emitters for maximum excitation efficiency. Deterministic molecular alignment also provides deterministically polarized output photons; using planar-aligned cholesteric liquid crystal hosts as 1-D photonic-band-gap microcavities tunable to the emitter fluorescence band to increase source efficiency, using liquid crystal technology to prevent emitter bleaching. Emitters comprise soluble dyes, inorganic nanocrystals or trivalent rare-earth chelates.

  6. Wavelength meter having single mode fiber optics multiplexed inputs

    DOE Patents [OSTI]

    Hackel, R.P.; Paris, R.D.; Feldman, M.

    1993-02-23

    A wavelength meter having a single mode fiber optics input is disclosed. The single mode fiber enables a plurality of laser beams to be multiplexed to form a multiplexed input to the wavelength meter. The wavelength meter can provide a determination of the wavelength of any one or all of the plurality of laser beams by suitable processing. Another aspect of the present invention is that one of the laser beams could be a known reference laser having a predetermined wavelength. Hence, the improved wavelength meter can provide an on-line calibration capability with the reference laser input as one of the plurality of laser beams.

  7. Diamond turning of Si and Ge single crystals

    SciTech Connect (OSTI)

    Blake, P.; Scattergood, R.O.

    1988-12-01

    Single-point diamond turning studies have been completed on Si and Ge crystals. A new process model was developed for diamond turning which is based on a critical depth of cut for plastic flow-to-brittle fracture transitions. This concept, when combined with the actual machining geometry for single-point turning, predicts that {open_quotes}ductile{close_quotes} machining is a combined action of plasticity and fracture. Interrupted cutting experiments also provide a meant to directly measure the critical depth parameter for given machining conditions.

  8. Overview of Hanford Single Shell Tank (SST) Structural Integrity

    SciTech Connect (OSTI)

    Rast, Richard S.; Washenfelder, Dennis J.; Johnson, Jeremy M.

    2013-11-14

    To improve the understanding of the single-shell tanks (SSTs) integrity, Washington River Protection Solutions, LLC (WRPS), the USDOE Hanford Site tank contractor, developed an enhanced Single-Shell Tank Integrity Project (SSTIP) in 2009. An expert panel on SST integrity, consisting of various subject matters experts in industry and academia, was created to provide recommendations supporting the development of the project. This panel developed 33 recommendations in four main areas of interest: structural integrity, liner degradation, leak integrity and prevention, and mitigation of contamination migration, Seventeen of these recommendations were used to develop the basis for the M-45-10-1 Change Package for the Hanford Federal Agreement and Compliance Order, which is also known as the Tri-Party Agreement. The structural integrity of the tanks is a key element in completing the cleanup mission at the Hanford Site. There are eight primary recommendations related to the structural integrity of Hanford Single-Shell Tanks. Six recommendations are being implemented through current and planned activities. The structural integrity of the Hanford is being evaluated through analysis, monitoring, inspection, materials testing, and construction document review. Structural evaluation in the form of analysis is performed using modern finite element models generated in ANSYS. The analyses consider in-situ, thermal, operating loads and natural phenomena such as earthquakes. Structural analysis of 108 of 149 Hanford Single-Shell Tanks has concluded that the tanks are structurally sound and meet current industry standards. Analysis of the remaining Hanford Single-Shell Tanks is scheduled for FY2014. Hanford Single-Shell Tanks are monitored through a dome deflection program. The program looks for deflections of the tank dome greater than 1/4 inch. No such deflections have been recorded. The tanks are also subjected to visual inspection. Digital cameras record the interior surface of the concrete tanks, looking for cracks and other surface conditions that may indicate signs of structural distress. The condition of the concrete and rebar of the Hanford Single-Shell Tanks is currently being tested and planned for additional activities in the near future. Concrete and rebar removed from the dome of a 65 year old tank was tested for mechanics properties and condition. Results indicated stronger than designed concrete with additional Petrographic examination and rebar completed. Material properties determined from previous efforts combined with current testing and construction document review will help to generate a database that will provide indication of Hanford Single-Shell Tank structural integrity.

  9. Method for thermal processing alumina-enriched spinel single crystals

    DOE Patents [OSTI]

    Jantzen, C.M.

    1995-05-09

    A process for age-hardening alumina-rich magnesium aluminum spinel to obtain the desired combination of characteristics of hardness, clarity, flexural strength and toughness comprises selection of the time-temperature pair for isothermal heating followed by quenching. The time-temperature pair is selected from the region wherein the precipitate groups have the characteristics sought. The single crystal spinel is isothermally heated and will, if heated long enough pass from its single phase through two pre-precipitates and two metastable precipitates to a stable secondary phase precipitate within the spinel matrix. Quenching is done slowly at first to avoid thermal shock, then rapidly. 12 figs.

  10. Modified SIMD architecture suitable for single-chip implementation

    E-Print Network [OSTI]

    Junichiro Makino

    2005-09-11

    We describe a modified SIMD architecture suitable for single-chip integration of a large number of processing elements, such as 1,000 or more. Important differences from traditional SIMD designs are: a) The size of the memory per processing elements is kept small. b) The processors are organized into groups, each with a small buffer memory. Reduction operation over the groups is done in hardware. The first change allows us to integrate a very large number of processing elements into a single chip. The second change allows us to achieve a close-to-peak performance for many scientific applications like particle-based simulations and dense-matrix operations.

  11. Single-shell tank retrieval program mission analysis report

    SciTech Connect (OSTI)

    Stokes, W.J.

    1998-08-11

    This Mission Analysis Report was prepared to provide the foundation for the Single-Shell Tank (SST) Retrieval Program, a new program responsible for waste removal for the SSTS. The SST Retrieval Program is integrated with other Tank Waste Remediation System activities that provide the management, technical, and operations elements associated with planning and execution of SST and SST Farm retrieval and closure. This Mission Analysis Report provides the basis and strategy for developing a program plan for SST retrieval. This Mission Analysis Report responds to a US Department of Energy request for an alternative single-shell tank retrieval approach (Taylor 1997).

  12. ARM - Field Campaign - Summer Single Column Model IOP

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach HomeA Better Anode DesigngovCampaignsSpring Single Column Model IOP ARM DatagovCampaignsSummer Single

  13. ARM - Field Campaign - Winter 1994 Single Column Model IOP

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach HomeA Better Anode DesigngovCampaignsSpring Single ColumngovCampaignsWinter 1994 Single Column Model IOP

  14. ARM - Field Campaign - Winter Single Column Model IOP

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach HomeA Better Anode DesigngovCampaignsSpring Single ColumngovCampaignsWinter 1994 Single Column

  15. Single photon emission at 1.55??m from charged and neutral exciton confined in a single quantum dash

    SciTech Connect (OSTI)

    Dusanowski, ?. Syperek, M.; Mrowi?ski, P.; Rudno-Rudzi?ski, W.; Misiewicz, J.; S?k, G.; Somers, A.; Kamp, M.; Höfling, S.; Reithmaier, J. P.

    2014-07-14

    We investigate charged and neutral exciton complexes confined in a single self-assembled InAs/InGaAlAs/InP quantum dash emitting at 1.55??m. The emission characteristics have been probed by measuring high-spatial-resolution polarization-resolved photoluminescence and cross-correlations of photon emission statistics at T?=?5?K. The photon auto-correlation histogram of the emission from both the neutral and charged exciton indicates a clear antibunching dip with as-measured g{sup (2)}(0) values of 0.18 and 0.31, respectively. It proves that these exciton complexes confined in single quantum dashes of InP-based material system can act as true single photon emitters being compatible with standard long-distance fiber communication technology.

  16. Intrinsic carrier mobility of a single-layer graphene covalently bonded with single-walled carbon nanotubes

    SciTech Connect (OSTI)

    Li, Dian; Shao, Zhi-Gang [Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou, Guangdong 510006 (China); Hao, Qing [Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721 (United States); Zhao, Hongbo, E-mail: zhaohb@scnu.edu.cn [Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou, Guangdong 510006 (China); Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721 (United States)

    2014-06-21

    We report intrinsic carrier mobility calculations of a two-dimensional nanostructure that consists of porous single layer graphene covalently bonded with single-walled carbon nanotubes on both sides. We used first-principles calculation and found that the deformation potential of such system is about 25% of that of graphene, and the carrier mobility is about 5?×?10{sup 4} cm{sup 2} V{sup ?1} s{sup ?1} for both electrons and holes, about one order of magnitude lower than that of graphene. This nanostructure and its three-dimensional stacking could serve as novel organic electronic materials.

  17. Single-machine Multiple-recipe Predictive Maintenance , John Hasenbein

    E-Print Network [OSTI]

    Hasenbein, John

    Single-machine Multiple-recipe Predictive Maintenance Yiwei Cai , John Hasenbein , Erhan assume that the controller knows both the machine status and the current number of jobs in the system into account the machine's degradation status, such control decisions are known as predictive maintenance

  18. Single-Commodity Robust Network Design with Finite and Hose ...

    E-Print Network [OSTI]

    2015-01-26

    that any traffic demand from a given uncertainty set can be satisfied by a feasi- ble single-commodity flow. ...... the gap heuristic. We stop the ... lower bound bmin i . We then say that any supply- and demand vector that obeys these bounds.

  19. Characterization of bipartite states using a single homodyne detector

    E-Print Network [OSTI]

    Virginia D'Auria; Alberto Porzio; Salvatore Solimeno; Stefano Olivares; Matteo G. A. Paris

    2005-09-26

    We suggest a scheme to reconstruct the covariance matrix of a two-mode state using a single homodyne detector plus a polarizing beam splitter and a polarization rotator. It can be used to fully characterize bipartite Gaussian states and to extract relevant informations on generic states.

  20. Characterization of single wall carbon nanotubes by nonane preadsorption

    E-Print Network [OSTI]

    Liu, Jie

    Characterization of single wall carbon nanotubes by nonane preadsorption Oleg Byl a , Jie Liu b for nanotube porosity characterization. Ó 2006 Elsevier Ltd. All rights reserved. Keywords: Carbon nanotubes decades for sorbent characterization. A number of methods have been developed for N2 isotherm analysis

  1. Notes on Single-Particle Reconstruction in Cryogenic

    E-Print Network [OSTI]

    Duncan, James S.

    Notes on Single-Particle Reconstruction in Cryogenic Electron Microscopy Hemant D. Tagare-dimensional structure of macromolecules. A more modern method is cryogenic electron microscopy (cryo-em), which of a cryo-EM experiment. In very simple terms, the cryo-em approach is to freeze several identical copies

  2. CELL CLINICS FOR BLOELECTRONIC INTERFACE WITH SINGLE CELLS

    E-Print Network [OSTI]

    Maryland at College Park, University of

    CELL CLINICS FOR BLOELECTRONIC INTERFACE WITH SINGLE CELLS P. Abshiret, J.-M Lauensteid Y.L i d E for capture and characterization of large numbers of individual cells. Each of these "cell clinics" consists of a cell-sized cavity and a lid that can be opened and closed by hinges constructed from polypyrrole

  3. MODELING STUDY OF A SINGLE-WELL ENHANCED

    E-Print Network [OSTI]

    Stanford University

    and a novel completion design was investigated. The thermosiphon is a downhole heat exchanger that takes, a downhole heat exchanger is not capable of generating energy sustainably. Therefore, a novel wellbore Exchanger has limited thermal output. Therefore, several other types of single-well configurations were

  4. Photovoltaic Measurements in Single-Nanowire Silicon Solar Cells

    E-Print Network [OSTI]

    Atwater, Harry

    Photovoltaic Measurements in Single-Nanowire Silicon Solar Cells Michael D. Kelzenberg, Daniel B-voltage measurements were made under simulated Air Mass 1.5 global illumination. Photovoltaic spectral response work by our group has shown that macroscopic Si wire arrays (>1 cm2 in area) suitable for photovoltaic

  5. Observation of Electroweak Single Top-Quark Production

    E-Print Network [OSTI]

    Xie, Si

    We report the observation of single top-quark production using 3.2??fb[superscript -1] of pp? collision data with ?s=1.96??TeV collected by the Collider Detector at Fermilab. The significance of the observed data is 5.0 ...

  6. Bimodal sensory discrimination is finer than dual single modality discrimination

    E-Print Network [OSTI]

    Johnston, Alan

    Bimodal sensory discrimination is finer than dual single modality discrimination Department of Psychology and Complex, University College London, London, U.KAlan Johnston Here we show that discriminating the first or second samples. We propose that the bimodal signal discrimination advantage arises from

  7. Single neutral pion production by charged-current $\\bar{\

    E-Print Network [OSTI]

    Aliaga, L; Bercellie, A; Bodek, A; Bravar, A; Brooks, W K; Butkevich, A; Caicedo, D A Martinez; Carneiro, M F; Christy, M E; Chvojka, J; da Motta, H; Devan, J; Dytman, S A; Díaz, G A; Eberly, B; Felix, J; Fields, L; Fine, R; Gago, A M; Gallagher, H; Gran, R; Harris, D A; Higuera, A; Hurtado, K; Kordosky, M; Le, T; Maher, E; Manly, S; Mann, W A; Marshall, C M; McFarland, K S; McGivern, C L; McGowan, A M; Miller, J; Morfín, J G; Mousseau, J; Nelson, J K; Norrick, A; Osta, J; Palomino, J L; Paolone, V; Park, J; Patrick, C E; Perdue, G N; Rakotondravohitra, L; Ramirez, M A; Ransome, R D; Ray, H; Ren, L; Rodrigues, P A; Ruterbories, D; Schellman, H; Schmitz, D W; Sobczyk, J T; Salinas, C J Solano; Tagg, N; Tice, B G; Valencia, E; Walton, T; Wolcott, J; Yepes-Ramirez, H; Zavala, G; Zhang, D; Ziemer, B P

    2015-01-01

    Single neutral pion production via muon antineutrino charged-current interactions in plastic scintillator (CH) is studied using the \\minerva detector exposed to the NuMI low-energy, wideband antineutrino beam at Fermilab. Measurement of this process constrains models of neutral pion production in nuclei, which is important because the neutral-current analog is a background for $\\bar{\

  8. NANO-SCALE CALORIMETRY OF ISOLATED POLYETHYLENE SINGLE CRYSTALS

    E-Print Network [OSTI]

    Allen, Leslie H.

    #12;NANO-SCALE CALORIMETRY OF ISOLATED POLYETHYLENE SINGLE CRYSTALS BY ALEX TAN KWAN B.S., Stanford) device, the nanocalorimeter, it was possible to investigate the melting of isolated polyethylene (PE, a simple Ni-foil calorimeter, to measure the heat capacity of a thin polyethylene film to verify

  9. Single Molecule Study of Cellulase Hydrolysis of Crystalline Cellulose

    SciTech Connect (OSTI)

    Liu, Y.-S.; Luo, Y.; Baker, J. O.; Zeng, Y.; Himmel, M. E.; Smith, S.; Ding, S.-Y.

    2009-12-01

    This report seeks to elucidate the role of cellobiohydrolase-I (CBH I) in the hydrolysis of crystalline cellulose. A single-molecule approach uses various imaging techniques to investigate the surface structure of crystalline cellulose and changes made in the structure by CBH I.

  10. Experimental Single-Photon Transmission from Satellite to Earth

    E-Print Network [OSTI]

    Juan Yin; Yuan Cao; Shu-Bin Liu; Ge-Sheng Pan; Jin-Hong Wang; Tao Yang; Zhong-Ping Zhang; Fu-Min Yang; Yu-Ao Chen; Cheng-Zhi Peng; Jian-Wei Pan

    2013-06-04

    Free-space quantum communication with satellites opens a promising avenue for global secure quantum network and large-scale test of quantum foundations. Recently, numerous experimental efforts have been carried out towards this ambitious goal. However, one essential step - transmitting single photons from the satellite to the ground with high signal-to-noise ratio (SNR) at realistic environments - remains experimental challenging. Here, we report a direct experimental demonstration of the satellite-ground transmission of a quasi-single-photon source. In the experiment, single photons (~0.85 photon per pulse) are generated by reflecting weak laser pulses back to earth with a cube-corner retro-reflector on the satellite Champ, collected by a 600-mm diameter telescope at the ground station, and finally detected by single-photon counting modules (SPCMs) after 400-km free-space link transmission. With the help of high accuracy time synchronization, narrow receiver field-of-view (FOV) and high-repetition-rate pulses (76 MHz), a SNR of better than 16:1 is obtained, which is sufficient for a secure quantum key distribution. Our experimental results represent an important step towards satellite-ground quantum communication.

  11. Thermodynamic Analysis of a single chamber Microbial Eric A. Zielke

    E-Print Network [OSTI]

    . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 #12;Microbial Fuel Cell Zielke 1 1 Introduction Renewable energy (RE) applications are becomingThermodynamic Analysis of a single chamber Microbial Fuel Cell Eric A. Zielke May 5, 2006 #12;Microbial Fuel Cell Zielke ii List of Tables 1 First Law Thermodynamic Efficiencies from Experimental Data

  12. Fully Enclosed Cylindrical Single-Electrode-Based Triboelectric Nanogenerator

    E-Print Network [OSTI]

    Wang, Zhong L.

    part of green and renewable energy. Many kinds of mechanical-energy-harvesting technologies have been be used as a direct power source for driving tens of green light-emitting diodes (LEDs). The S: triboelectric nanogenerator, single-electrode-based, self-powered, energy harvesting INTRODUCTION Owing

  13. Processing A Printed Wiring Board By Single Bath Electrodeposition

    DOE Patents [OSTI]

    Meltzer, Michael P. (Oakland, CA); Steffani, Christopher P. (Livermore, CA); Gonfiotti, Ray A. (Livermore, CA)

    2003-04-15

    A method of processing a printed wiring board by single bath electrodeposition. Initial processing steps are implemented on the printed wiring board. Copper is plated on the printed wiring board from a bath containing nickel and copper. Nickel is plated on the printed wiring board from the bath containing nickel and copper and final processing steps are implemented on the printed wiring board.

  14. Single B production through R-parity violation

    SciTech Connect (OSTI)

    O'Leary, Ben [SUPA, School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, Scotland (United Kingdom)

    2007-03-01

    Supersymmetry without R-parity predicts tree-level quark flavor violation. We present a potential signal of single bottom production at electron-positron colliders with energies in the range 6 to 20 GeV. Taking into account rare decay limits, it should be detectable with the current BABAR and Belle data samples.

  15. Single Cell Analysis Using Microfluidics Coupled to Ultrasensitive Mass Spectrometry

    E-Print Network [OSTI]

    Single Cell Analysis Using Microfluidics Coupled to Ultrasensitive Mass Spectrometry PI Ryan Kelly is to combine microfluidic sample preparation and separations with the ultrasensitive mass spectrometry (MS without the need for chemical labeling. We will combine our expertise in the fields of microfluidics

  16. Search for single top quark production at LEP2

    E-Print Network [OSTI]

    Wilson, Graham Wallace; OPAL Collaboration; Abbiendi, G.; Ainsley, C.; Å kesson, P.F.; Alexander, G.; Allison, J.; Anagnostou, G.; Anderson, K.J.; Arcelli, S.; Asai, S.; Axen, D.; Azuelos, G.; Bailey, I.

    2001-11-29

    for the FCNC process e^+e^??tc(u)?bWc(u). This analysis is sensitive to the leptonic and the hadronic decay modes of the W boson. No evidence for a FCNC process is observed. Upper limits at the 95% confidence level on the single top production cross...

  17. Multiple ERK substrates execute single biological processes in Caenorhabditis elegans

    E-Print Network [OSTI]

    Multiple ERK substrates execute single biological processes in Caenorhabditis elegans germ, 2008) RAS-extracellular signal regulated kinase (ERK) signaling governs multiple aspects of cell fate. Understanding how perturbations to the ERK signaling pathway lead to developmental disorders and cancer hinges

  18. Test of pulse shape analysis using single Compton scattering events

    E-Print Network [OSTI]

    I. Abt; A. Caldwell; K. Kröninger; J. Liu; X. Liu; B. Majorovits

    2007-08-13

    Compton scattering is one of the dominant interaction processes in germanium for photons with an energy of around two MeV. If a photon scatters only once inside a germanium detector, the resulting event contains only one electron which normally deposits its energy within a mm range. Such events are similar to Ge-76 neutrinoless double beta-decay events with just two electrons in the final state. Other photon interactions like pair production or multiple scattering can result in events composed of separated energy deposits. One method to identify the multiple energy deposits is the use of timing information contained in the electrical response of a detector or a segment of a detector. The procedures developed to separate single- and multiple-site events are tested with specially selected event samples provided by an 18-fold segmented prototype germanium detector for Phase II of the GERmanium Detector Array, GERDA. The single Compton scattering, i.e. single-site, events are tagged by coincidently detecting the scattered photon with a second detector positioned at a defined angle. A neural network is trained to separate such events from events which come from multi-site dominated samples. Identification efficiencies of ~80% are achieved for both single- and multi-site events.

  19. Planning Single-arm Manipulations with N-Arm Robots

    E-Print Network [OSTI]

    Likhachev, Maxim

    Planning Single-arm Manipulations with N-Arm Robots Benjamin Cohen bcohen@seas.upenn.edu University@cs.cmu.edu Carnegie Mellon University Abstract--Many robotic systems are comprised of two or more arms. Such systems range from dual-arm household manipula- tors to factory floors populated with a multitude of industrial

  20. Hydrogen Production in a Single Chamber Microbial Electrolysis Cell

    E-Print Network [OSTI]

    Hydrogen Production in a Single Chamber Microbial Electrolysis Cell Lacking a Membrane D O U G L 7, 2008. Hydrogen gas can be produced by electrohydrogenesis in microbial electrolysis cells (MECs assumed that a membrane is needed in an MEC to avoid hydrogen losses due to bacterial consumption

  1. Phasefield Modeling of Graphite Single Particles And Porous Electrodes

    E-Print Network [OSTI]

    Chen, Long-Qing

    Abstract Graphite is the most commonly used anode material in lithiumion batteries because of excellent Phasefield Modeling of Graphite Single Particles And Porous Electrodes Singlelayer regular of the layered graphite material. We use the same model to fit both singleparticle experimental data

  2. Innovative Methodology Efficient Estimation of Detailed Single-Neuron Models

    E-Print Network [OSTI]

    Columbia University

    ) and propose a simple statistical method for automatically building large, detailed compartmental models of single neurons, circumvent- ing some of the traditional complexities in building these models "by hand, the knowledge that passive properties of neurons are accurately described by the cable equation (Baldi et al

  3. Experimental test of nonclassicality for a single particle

    E-Print Network [OSTI]

    G. Brida; I. Degiovanni; M. Genovese; V. Schettini; S. Polyakov; A. Migdall

    2008-04-10

    In a recent paper [R. Alicki and N. Van Ryn, J. Phys. A: Math. Theor., 41, 062001 (2008)] a test of nonclassicality for a single qubit was proposed. Here, we discuss the class of local realistic theories to which this test applies and present an experimental realization.

  4. Single-particle kinetics of influenza virus membrane fusion

    E-Print Network [OSTI]

    Single-particle kinetics of influenza virus membrane fusion Daniel L. Floyd*, Justin R. Ragains for review July 24, 2008) Membrane fusion is an essential step during entry of enveloped viruses into cells. Conventional fusion assays are generally limited to observation of ensembles of multiple fusion events

  5. Cysteine engineering of polyproteins for single-molecule force spectroscopy

    E-Print Network [OSTI]

    Dietz, Hendrik

    polyprotein construction. The basic concept of cysteine engineering of polyproteins is out- lined in Figure 1Cysteine engineering of polyproteins for single- molecule force spectroscopy Hendrik Dietz, Morten. We describe in detail the method to construct polyproteins with precisely controlled linkage

  6. Single Glucose Biofuel Cells Implanted in Rats Power Electronic Devices

    E-Print Network [OSTI]

    Boyer, Edmond

    Single Glucose Biofuel Cells Implanted in Rats Power Electronic Devices A. Zebda1,2 , S. Cosnier1 the first implanted glucose biofuel cell (GBFC) that is capable of generating sufficient power from a mammal further developments. Following recent developments in nano- and biotechnology, state-of-the-art biofuel

  7. Cancer Phylogenetics from Single-Cell Assays Gregory Pennington

    E-Print Network [OSTI]

    Cancer Phylogenetics from Single-Cell Assays Gregory Pennington Stanley Shackney Russell Schwartz the Carnegie Mellon University Berkman Faculty Development Fund. #12;Keywords: computational biology, cancer, FISH, phylogeny #12;Abstract In the field of cancer biology, there is currently great interest

  8. Stochastics and Statistics Bayesian semiparametric analysis for a single item

    E-Print Network [OSTI]

    Popova, Elmira

    Stochastics and Statistics Bayesian semiparametric analysis for a single item maintenance and Operations Management, McCombs School of Business, The University of Texas at Austin, Austin, TX 78712, USA b Operations Research and Industrial Engineering, The University of Texas at Austin, Austin, TX 78712, USA c

  9. Measurements of absolute single differential cross section (SDCS)

    E-Print Network [OSTI]

    Zouros, Theo

    , Office of Basic Energy Sciences, Of­ fice of Energy research, U.S. Department of Energy, Hu­ man Capital and Mobility Program of the EU and the Greek Ministry of Industry, Energy and Technology. SIMION Tuning EnergyMeasurements of absolute single differential cross section (SDCS) [Left] and percentage energy res

  10. Spectral characteristics of single and coupled microresonator lasers comprising a

    E-Print Network [OSTI]

    Cunningham, Brian

    Spectral characteristics of single and coupled microresonator lasers comprising a replica-molded introduced defect (2 section removed) have been examined with respect to the output spectrum, pump energy of intentionally introduced defects or coupled arrays of resonators to control the characteristics of microla- sers

  11. Single-Crystal Calcium Hexaboride Nanowires: Synthesis and

    E-Print Network [OSTI]

    by the theoretical prediction of metallic single- walled boron24 and aluminum boride (AlB2) nanotubes,25 weO powders at 860-900 °C and 155 mTorr. Nickel (Ni) is found to be an effective catalytic material. To our

  12. Single-shell tank interim stabilization project plan

    SciTech Connect (OSTI)

    Ross, W.E.

    1998-05-11

    This project plan establishes the management framework for conduct of the TWRS Single-Shell Tank Interim Stabilization completion program. Specifically, this plan defines the mission needs and requirements; technical objectives and approach; organizational structure, roles, responsibilities, and interfaces; and operational methods. This plan serves as the project executional baseline.

  13. EVALUATION OF VALUE CREATION CONCEPTS IN SINGLE FAMILY RESIDENTIAL SUBDIVISIONS 

    E-Print Network [OSTI]

    Shin, Woo Jin

    2010-07-14

    To increase real estate values, developers often apply designs on the land. In the case of a single family housing development, the designs are applied to the unit of subdivisions. In this study, the designs are defined as “value creation concepts...

  14. Single Particle Orientation and Rotational Tracking (SPORT) in biopysical studies

    SciTech Connect (OSTI)

    Gu, Yan; Ha, Ji Won; Augspurger, Ashley E.; Chen, Kuangcai; Zhu, Shaobin; Fang, Ning

    2013-08-02

    The single particle orientation and rotational tracking (SPORT) techniques have seen rapid development in the past 5 years. Recent technical advances have greatly expanded the applicability of SPORT in biophysical studies. In this feature article, we survey the current development of SPORT and discuss its potential applications in biophysics, including cellular membrane processes and intracellular transport.

  15. Computer simulations of single particles in external electric fields

    E-Print Network [OSTI]

    Jiajia Zhou; Friederike Schmid

    2015-07-20

    Applying electric fields is an attractive way to control and manipulate single particles or molecules, e.g., in lab-on-a-chip devices. However, the response of nanosize objects in electrolyte solution to external fields is far from trivial. It is the result of a variety of dynamical processes taking place in the ion cloud surrounding charged particles and in the bulk electrolyte, and it is governed by an intricate interplay of electrostatic and hydrodynamic interactions. Already systems composed of one single particle in electrolyte solution exhibit a complex dynamical behaviour. In this review, we discuss recent coarse-grained simulations that have been performed to obtain a molecular-level understanding of the dynamic and dielectric response of single particles and single macromolecules to external electric fields. We address both the response of charged particles to constant fields (DC fields), which can be characterized by an electrophoretic mobility, and the dielectric response of both uncharged and charged particles to alternating fields (AC fields), which is described by a complex polarizability. Furthermore, we give a brief survey of simulation algorithms and highlight some recent developments.

  16. Electromagnetic Interference (EMI) Shielding of Single-Walled Carbon

    E-Print Network [OSTI]

    Gao, Hongjun

    Electromagnetic Interference (EMI) Shielding of Single-Walled Carbon Nanotube Epoxy Composites Ning) shielding effectiveness (SE) of SWNTs. Our results indicate that SWNTs can be used as effective lightweight EMI shielding materials. Composites with greater than 20 dB shielding efficiency were obtained easily

  17. Postdoc Position in Microfluidics and Single Cell Raman Spectroscopy

    E-Print Network [OSTI]

    Horn, Matthias

    Postdoc Position in Microfluidics and Single Cell Raman Spectroscopy Department of Microbial and Environmental Microfluidics Group (http://web.mit.edu/romanstocker) Department of Civil & Environmental (junior or senior) with strong expertise in microfluidics and an interest in applying it to microbial

  18. Alternative Heat Recovery Options for Single-Stage Spray Dryers 

    E-Print Network [OSTI]

    Wagner, J. R.

    1984-01-01

    Many powdered products are dried to their final moisture content by use of spray dryers. A basic spray dryer mixes an aqueous feedstock with heated air, vaporizing the water in the feedstock and producing the final dried powder in a single stage...

  19. Free energy reconstruction from nonequilibrium single-molecule pulling experiments

    E-Print Network [OSTI]

    Weeks, Eric R.

    Free energy reconstruction from nonequilibrium single-molecule pulling experiments Gerhard Hummer also drives the system away from equilibrium. Nevertheless, we show how equilibrium free energy of an extension of Jarzynski's remarkable identity between free energies and the irreversible work. Recent

  20. Free Energy Surfaces from Single-Distance Information Philipp Schuetz,

    E-Print Network [OSTI]

    Caflisch, Amedeo

    Free Energy Surfaces from Single-Distance Information Philipp Schuetz, Rene´ Wuttke, Benjamin We propose a network-based method for determining basins and barriers of complex free energy surfaces for the iterative determination of individual basins by the minimum-cut-based free energy profile, a barrier

  1. Multiple Query Probabilistic Roadmap Planning using Single Query Planning Primitives

    E-Print Network [OSTI]

    Kavraki, Lydia E.

    Multiple Query Probabilistic Roadmap Planning using Single Query Planning Primitives Kostas E query planners. Our implementation uses a probabilistic roadmap method PRM with bidirectional rapidly which uses the strengths of both is obtained. The probabilistic roadmap method (PRM) approach to motion

  2. SINGLE-ZONE STACK-DOMINATED INFILTRATION MODELING Max Sherman

    E-Print Network [OSTI]

    dominates and total ventilation can be calculated by treating other effects (i.e., wind and small fansSINGLE-ZONE STACK-DOMINATED INFILTRATION MODELING Max Sherman Energy Performance of Buildings Group Energy, Office of Buildings and Community Systems Building Systems Division of the U.S. Department

  3. Electrokinetically Based Approach for Single-Nucleotide Polymorphism Discrimination

    E-Print Network [OSTI]

    Erickson, David

    gene, associated with the childhood disease spinal muscular atrophy, is conducted. Single control. In addition, microarray hybridization and washing manipulation is conducted on centimeter and polycarbonate chips designed to be credit card sized17 or that offer continuous monitoring of the hybridization

  4. Uncovering the single top: observation of electroweak top quark production

    SciTech Connect (OSTI)

    Benitez, Jorge Armando; /Michigan State U.

    2009-08-01

    The top quark is generally produced in quark and anti-quark pairs. However, the Standard Model also predicts the production of only one top quark which is mediated by the electroweak interaction, known as 'Single Top'. Single Top quark production is important because it provides a unique and direct way to measure the CKM matrix element V{sub tb}, and can be used to explore physics possibilities beyond the Standard Model predictions. This dissertation presents the results of the observation of Single Top using 2.3 fb{sup -1} of Data collected with the D0 detector at the Fermilab Tevatron collider. The analysis includes the Single Top muon+jets and electron+jets final states and employs Boosted Decision Tress as a method to separate the signal from the background. The resulting Single Top cross section measurement is: (1) {sigma}(p{bar p} {yields} tb + X, tqb + X) = 3.74{sub -0.74}{sup +0.95} pb, where the errors include both statistical and systematic uncertainties. The probability to measure a cross section at this value or higher in the absence of signal is p = 1.9 x 10{sup -6}. This corresponds to a standard deviation Gaussian equivalence of 4.6. When combining this result with two other analysis methods, the resulting cross section measurement is: (2) {sigma}(p{bar p} {yields} tb + X, tqb + X) = 3.94 {+-} 0.88 pb, and the corresponding measurement significance is 5.0 standard deviations.

  5. Single-Session Radiofrequency Ablation of Bilateral Lung Metastases

    SciTech Connect (OSTI)

    Palussiere, Jean, E-mail: palussiere@bergonie.org; Gomez, Fernando; Cannella, Matthieu; Ferron, Stephane; Descat, Edouard [Institut Bergonie, Department of Radiology, Regional Cancer Centre (France); Fonck, Marianne [Institut Bergonie, Department of Digestive Oncology (France); Brouste, Veronique [Institut Bergonie, Clinical and Epidemiological Research Unit (France); Avril, Antoine [Institut Bergonie, Department of Surgery (France)

    2012-08-15

    Purpose: This retrospective study examined the feasibility and efficacy of bilateral lung radiofrequency ablation (RFA) performed in a single session. Methods: From 2002-2009, patients with bilateral lung metastases were treated by RFA, where possible in a single session under general anesthesia with CT guidance. The second lung was punctured only if no complications occurred after treatment of the first lung. Five lung metastases maximum per patient were treated by RFA and prospectively followed. The primary endpoint was the evaluation of acute and delayed complications. Secondary endpoints were calculation of hospitalization duration, local efficacy, median survival, and median time to tumor progression. Local efficacy was evaluated on CT or positron emission tomography (PET) CT. Results: Sixty-seven patients were treated for bilateral lung metastases with RFA (mean age, 62 years). Single-session treatment was not possible in 40 due to severe pneumothoraces (n = 24), bilateral pleural contact (n = 14), and operational exclusions (n = 2). Twenty-seven (41%) received single-session RFA of lesions in both lungs for 66 metastases overall. Fourteen unilateral and four bilateral pneumothoraces occurred (18 overall, 66.7%). Unilateral (n = 13) and bilateral (n = 2) chest tube drainage was required. Median hospitalization was 3 (range, 2-8) days. Median survival was 26 months (95% confidence interval (CI), 19-33). Four recurrences on RFA sites were observed (4 patients). Median time to tumor progression was 9.5 months (95% CI, 4.2-23.5). Conclusions: Although performing single-session bilateral lung RFA is not always possible due to pneumothoraces after RFA of first lung, when it is performed, this technique is safe and effective.

  6. Experimental plan for the Single-Family Study

    SciTech Connect (OSTI)

    Berry, L.G.; Brown, M.A.; Wright, T.; White, D.L.

    1991-09-01

    The national evaluation of the Weatherization Assistance Program (WAP) consists of five separate studies. The Single-Family Study is one of three studies that will estimate program energy savings and cost effectiveness in principal WAP submarkets. This report presents the experimental plan for the Single-Family Study, which will be implemented over the next three years (1991--1993). The Single-Family Study will directly estimate energy savings for a nationally representative sample of single-family and small multifamily homes weatherized in the 1989 program year. Savings will be estimated from gas and electric utility billing records using the Princeton Scorekeeping Method (PRISM). The study will also assess nonenergy impacts (e.g., health, comfort, safety, and housing affordability), estimate cost effectiveness, and analyze factors influencing these outcomes. For homes using fuels such as wood, coal, fuel oil, kerosene, and propane as the primary source of space conditioning, energy savings will be studied indirectly. The study will assemble a large nationally representative data base. A cluster sampling approach will be used, in which about 400 subgrantees are selected in a first stage and weatherized homes are selected in a second range. To ensure that the Single-Family Study is able to identify promising opportunities for future program development, two purposively selected groups of subgrantees will be included: (1) subgrantees that install cooling measures (such as more efficient air conditioning equipment or radiant barriers), and (2) exemplary subgrantees that use state-of-the-art technologies and service delivery procedures (such as advanced audit techniques, blower door tests, infrared scanners, extensive client education, etc.). These two groups of subgrantees will be analyzed to identify the most effective program elements in specific circumstances. 14 refs., 4 figs., 3 tabs.

  7. Evaluation of the Cow Rumen Metagenome; Assembly by Single Copy Gene Analysis and Single Cell Genome Assemblies(Metagenomics Informatics Challenges Workshop: 10K Genomes at a Time)

    ScienceCinema (OSTI)

    Sczyrba, Alex [DOE JGI

    2013-01-22

    DOE JGI's Alex Sczyrba on "Evaluation of the Cow Rumen Metagenome" and "Assembly by Single Copy Gene Analysis and Single Cell Genome Assemblies" at the Metagenomics Informatics Challenges Workshop held at the DOE JGI on October 12-13, 2011.

  8. Unified single-photon and single-electron counting statistics: from cavity-QED to electron transport

    E-Print Network [OSTI]

    Neill Lambert; Yueh-Nan Chen; Franco Nori

    2010-08-26

    A key ingredient of cavity quantum-electrodynamics (QED) is the coupling between the discrete energy levels of an atom and photons in a single-mode cavity. The addition of periodic ultra-short laser pulses allows one to use such a system as a source of single photons; a vital ingredient in quantum information and optical computing schemes. Here, we analyze and ``time-adjust'' the photon-counting statistics of such a single-photon source, and show that the photon statistics can be described by a simple `transport-like' non-equilibrium model. We then show that there is a one-to-one correspondence of this model to that of non-equilibrium transport of electrons through a double quantum dot nanostructure. Then we prove that the statistics of the tunnelling electrons is equivalent to the statistics of the emitted photons. This represents a unification of the fields of photon counting statistics and electron transport statistics. This correspondence empowers us to adapt several tools previously used for detecting quantum behavior in electron transport systems (e.g., super-Poissonian shot noise, and an extension of the Leggett-Garg inequality) to single-photon-source experiments.

  9. On the numerical relaxation of single-slip plasticity in finite strains

    E-Print Network [OSTI]

    Moroz, Vitaly

    ;[2] Conti S., Relaxation of single-slip single-crystal plasticity with linear self-hardening, In: Proceed., Orlando A., Mixed analytical-numerical relaxation in single-slip crystal plasticity, AcceptedOn the numerical relaxation of single-slip plasticity in finite strains Antonio Orlando (Swansea

  10. Strange kinetics of single molecules in living cells Eli Barkai, Yuval Garini, and Ralf Metzler

    E-Print Network [OSTI]

    Potsdam, Universität

    in Germany and Finland Distinguished Professor at Tampere University of Technology in Finland. of single

  11. Fuel Performance Experiments on the Atomistic Level, Studying Fuel Through Engineered Single Crystal UO2

    SciTech Connect (OSTI)

    Burgett, Eric; Deo, Chaitanya; Phillpot, Simon

    2015-05-08

    Fuel Performance Experiments on the Atomistic Level, Studying Fuel Through Engineered Single Crystal UO2

  12. PHYSICAL REVIEW VOLUME 183; NUMBER 4 20 J ULY 1969 Single-Particle Theory of Fission*

    E-Print Network [OSTI]

    manuscript received 6 December 1968) The single-particle aspects of nuclear fission theories are investigated

  13. Single-Crystal Structure of a Covalent Organic Framework

    SciTech Connect (OSTI)

    Zhang, YB; Su, J; Furukawa, H; Yun, YF; Gandara, F; Duong, A; Zou, XD; Yaghi, OM

    2013-11-06

    The crystal structure of a new covalent organic framework, termed COF-320, is determined by single-crystal 3D electron diffraction using the rotation electron diffraction (RED) method for data collection. The COF crystals are prepared by an imine condensation of tetra-(4-anilyl)methane and 4,4'-biphenyldialdehyde in 1,4-dioxane at 120 degrees C to produce a highly porous 9-fold interwoven diamond net. COF-320 exhibits permanent porosity with a Langmuir surface area of 2400 m(2)/g and a methane total uptake of 15.0 wt % (176 cm(3)/cm(3)) at 25 degrees C and 80 bar. The successful determination of the structure of COF-320 directly from single-crystal samples is an important advance in the development of COF chemistry.

  14. Single-electron shuttle based on a silicon quantum dot

    E-Print Network [OSTI]

    K. W. Chan; M. Mottonen; A. Kemppinen; N. S. Lai; K. Y. Tan; W. H. Lim; A. S. Dzurak

    2011-10-05

    We report on single-electron shuttling experiments with a silicon metal-oxide-semiconductor quantum dot at 300 mK. Our system consists of an accumulated electron layer at the Si/SiO_2 interface below an aluminum top gate with two additional barrier gates used to deplete the electron gas locally and to define a quantum dot. Directional single-electron shuttling from the source and to the drain lead is achieved by applying a dc source-drain bias while driving the barrier gates with an ac voltage of frequency f_p. Current plateaus at integer levels of ef_p are observed up to f_p = 240 MHz operation frequencies. The observed results are explained by a sequential tunneling model which suggests that the electron gas may be heated substantially by the ac driving voltage.

  15. Single electron detection and spectroscopy via relativistic cyclotron radiation

    E-Print Network [OSTI]

    D. M. Asner; R. F. Bradley; L. de Viveiros; P. J. Doe; J. L. Fernandes; M. Fertl; E. C. Finn; J. A. Formaggio; D. Furse; A. M. Jones; J. N. Kofron; B. H. LaRoque; M. Leber; E. L. McBride; M. L. Miller; P. Mohanmurthy; B. Monreal; N. S. Oblath; R. G. H. Robertson; L. J Rosenberg; G. Rybka; D. Rysewyk; M. G. Sternberg; J. R. Tedeschi; T. Thummler; B. A. VanDevender; N. L. Woods

    2015-05-01

    It has been understood since 1897 that accelerating charges must emit electromagnetic radiation. Cyclotron radiation, the particular form of radiation emitted by an electron orbiting in a magnetic field, was first derived in 1904. Despite the simplicity of this concept, and the enormous utility of electron spectroscopy in nuclear and particle physics, single-electron cyclotron radiation has never been observed directly. Here we demonstrate single-electron detection in a novel radiofrequency spec- trometer. We observe the cyclotron radiation emitted by individual magnetically-trapped electrons that are produced with mildly-relativistic energies by a gaseous radioactive source. The relativistic shift in the cyclotron frequency permits a precise electron energy measurement. Precise beta elec- tron spectroscopy from gaseous radiation sources is a key technique in modern efforts to measure the neutrino mass via the tritium decay endpoint, and this work demonstrates a fundamentally new approach to precision beta spectroscopy for future neutrino mass experiments.

  16. Single ion implantation for solid state quantum computer development

    SciTech Connect (OSTI)

    Schenkel, Thomas; Meijers, Jan; Persaud, Arun; McDonald, Joseph W.; Holder, Joseph P.; Schneider, Dieter H.

    2001-12-18

    Several solid state quantum computer schemes are based on the manipulation of electron and nuclear spins of single donor atoms in a solid matrix. The fabrication of qubit arrays requires the placement of individual atoms with nanometer precision and high efficiency. In this article we describe first results from low dose, low energy implantations and our development of a low energy (<10 keV), single ion implantation scheme for {sup 31}P{sup q+} ions. When {sup 31}P{sup q+} ions impinge on a wafer surface, their potential energy (9.3 keV for P{sup 15+}) is released, and about 20 secondary electrons are emitted. The emission of multiple secondary electrons allows detection of each ion impact with 100% efficiency. The beam spot on target is controlled by beam focusing and collimation. Exactly one ion is implanted into a selected area avoiding a Poissonian distribution of implanted ions.

  17. Search for Single Top Quark Production at LEP2

    E-Print Network [OSTI]

    The OPAL collaboration; G. Abbiendi

    2001-10-04

    A search for single top quark production via flavour changing neutral currents (FCNC) was performed with data collected by the OPAL detector at the e+e- collider LEP. Approximately 600 pb-1 of data collected at sqrt(s) = 189 - 209 GeV were used to search for the FCNC process e+ e- -> tc(u) -> bWc(u). This analysis is sensitive to the leptonic and the hadronic decay modes of the W boson. No evidence for a FCNC process is observed. Upper limits at the 95% confidence level on the single top production cross-section as a function of the centre-of-mass energy are derived. Limits on the anomalous coupling parameters kappa_gamma and kappa_Z are determined from these results.

  18. Coplanar interdigitated grid detector with single electrode readout

    DOE Patents [OSTI]

    Luke, Paul N. (Castro Valley, CA)

    2001-01-01

    The coplanar interdigitated grid technique with single electrode readout provides substantial spectral performance improvement over that of conventional full-area planar electrode detectors and over coplanar interdigitated grid detectors which measure the difference between the induced charge signals from two interdigitated coplanar grid electrodes. The signal from only one interdigitated grid electrode is read out. The signal response is optimized by changing the relative areas of the two grid electrodes and the bias applied across the detector. Only one preamplifier is needed and signal subtraction is not necessary. This eliminates the electronic noise contribution from the additional preamplifier used in the normal coplanar grid implementation, and conventional single-amplifier detector electronics can be used.

  19. Predicted Ultrafast Single Qubit Operations in Semiconductor Quantum Dots

    E-Print Network [OSTI]

    Pryor, C E

    2002-01-01

    Several recently proposed implementations of scalable quantum computation rely on the ability to manipulate the spin polarization of individual electrons in semiconductors. The most rapid single-spin-manipulation technique to date relies on the generation of an effective magnetic field via a spin-sensitive optical Stark effect. This approach has been used to split spin states in colloidal CdSe quantum dots and to manipulate ensembles of spins in ZnMnSe quantum wells with femtosecond optical pulses. Here we report that the process will produce a coherent rotation of spin in quantum dots containing a single electron. The calculated magnitude of the effective magnetic field depends on the dot bandgap and the strain. We predict that in InAs/InP dots, for reasonable experimental parameters, the magnitude of the rotation is sufficient and the intrinsic error is low enough for them to serve as elements of a quantum dot based quantum computer.

  20. Predicted Ultrafast Single Qubit Operations in Semiconductor Quantum Dots

    E-Print Network [OSTI]

    C. E. Pryor; M. E. Flatté

    2002-11-25

    Several recently proposed implementations of scalable quantum computation rely on the ability to manipulate the spin polarization of individual electrons in semiconductors. The most rapid single-spin-manipulation technique to date relies on the generation of an effective magnetic field via a spin-sensitive optical Stark effect. This approach has been used to split spin states in colloidal CdSe quantum dots and to manipulate ensembles of spins in ZnMnSe quantum wells with femtosecond optical pulses. Here we report that the process will produce a coherent rotation of spin in quantum dots containing a single electron. The calculated magnitude of the effective magnetic field depends on the dot bandgap and the strain. We predict that in InAs/InP dots, for reasonable experimental parameters, the magnitude of the rotation is sufficient and the intrinsic error is low enough for them to serve as elements of a quantum dot based quantum computer.

  1. Single Molecule Junctions: Probing Contact Chemistry and Fundamental Circuit Laws

    SciTech Connect (OSTI)

    Hybertsen M. S.

    2013-04-11

    By exploiting selective link chemistry, formation of single molecule junctions with reproducible conductance has become established. Systematic studies reveal the structure-conductance relationships for diverse molecules. I will draw on experiments from my collaborators at Columbia University, atomic-scale calculations and theory to describe progress in two areas. First, I will describe a novel route to form single molecule junctions, based on SnMe3 terminated molecules, in which gold directly bonds to carbon in the molecule backbone resulting in near ideal contact resistance [1]. Second, comparison of the conductance of junctions formed with molecular species containing either one backbone or two backbones in parallel allows demonstration of the role of quantum interference in the conductance superposition law at the molecular scale [2].

  2. Photonic quantum walk in a single beam with twisted light

    E-Print Network [OSTI]

    Cardano, Filippo; Karimi, Ebrahim; Slussarenko, Sergei; Paparo, Domenico; de Lisio, Corrado; Sciarrino, Fabio; Santamato, Enrico; Marrucci, Lorenzo

    2014-01-01

    Inspired by the classical phenomenon of random walk, the concept of quantum walk has emerged recently as a powerful platform for the dynamical simulation of complex quantum systems, entanglement production and universal quantum computation. Such a wide perspective motivates a renewing search for efficient, scalable and stable implementations of this quantum process. Photonic approaches have hitherto mainly focused on multi-path schemes, requiring interferometric stability and a number of optical elements that scales quadratically with the number of steps. Here we report the experimental realization of a quantum walk taking place in the orbital angular momentum space of light, both for a single photon and for two simultaneous indistinguishable photons. The whole process develops in a single light beam, with no need of interferometers, and requires optical resources scaling linearly with the number of steps. Our demonstration introduces a novel versatile photonic platform for implementing quantum simulations, b...

  3. The linac coherent light source single particle imaging road map

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

    Aquila, A.; Barty, A.; Bostedt, C.; Boutet, S.; Carini, G.; dePonte, D.; Drell, P.; Doniach, S.; Downing, K. H.; Earnest, T.; et al

    2015-07-01

    Intense femtosecond x-ray pulses from free-electron laser sources allow the imaging of individual particles in a single shot. Early experiments at the Linac Coherent Light Source (LCLS) have led to rapid progress in the field and, so far, coherent diffractive images have been recorded from biological specimens, aerosols, and quantum systems with a few-tens-of-nanometers resolution. In March 2014, LCLS held a workshop to discuss the scientific and technical challenges for reaching the ultimate goal of atomic resolution with single-shot coherent diffractive imaging. This paper summarizes the workshop findings and presents the roadmap toward reaching atomic resolution, 3D imaging at free-electronmore »laser sources.« less

  4. Dissipationless Directed Transport in Rocked Single-Band Quantum Dynamics

    E-Print Network [OSTI]

    Jiangbin Gong; Dario Poletti; Peter Hanggi

    2007-02-28

    Using matter waves that are trapped in a deep optical lattice, dissipationless directed transport is demonstrated to occur if the single-band quantum dynamics is periodically tilted on one half of the lattice by a monochromatic field. Most importantly, the directed transport can exist for almost all system parameters, even after averaged over a broad range of single-band initial states. The directed transport is theoretically explained within ac-scattering theory. Total reflection phenomena associated with the matter waves travelling from a tilting-free region to a tilted region are emphasized. The results are of relevance to ultracold physics and solid-state physics, and may lead to powerful means of selective, coherent, and directed transport of cold particles in optical lattices.

  5. Single-photon ultrashort-lived radionuclides: symposium proceedings

    SciTech Connect (OSTI)

    Paras, P.; Thiessen, J.W. (eds.)

    1985-01-01

    The purpose was to define the current role and state-of-the-art regarding the development, clinical applications, and usefulness of generator-produced single-photon ultrashort-lived radionuclides (SPUSLR's) and to predict their future impact on medicine. Special emphasis was placed on the generator production of iridium-191, gold-195, and krypton-81. This report contains expanded summaries of the included papers. (ACR)

  6. Single-top hadroproduction in association with a W boson

    E-Print Network [OSTI]

    S. Frixione; E. Laenen; P. Motylinski; B. Webber; C. D. White

    2008-05-20

    We present the calculation of the Wt single-top production channel to next-to-leading order in QCD, interfaced with parton showers within the MC@NLO formalism. This channel provides a complementary way of investigating the properties of the Wtb vertex, with respect to the s- and t-channels. We pay special attention to the separation of this process from top quark pair production.

  7. Single-top production in MC@NLO

    E-Print Network [OSTI]

    S. Frixione; E. Laenen; P. Motylinski; B. R. Webber

    2006-03-31

    We match next-to-leading order QCD results for single-top hadroproduction with parton shower Monte Carlo simulations, according to the prescription of the MC@NLO formalism. In this way, we achieve the first practical implementation in MC@NLO of a process that has both initial- and final-state collinear singularities. We show that no difficulties of principle arise from this complication, and present selected results relevant to the Tevatron.

  8. Growth and characterization of lithium yttrium borate single crystals

    SciTech Connect (OSTI)

    Singh, A. K.; Singh, S. G.; Tyagi, M.; Desai, D. G.; Sen, Shashwati

    2014-04-24

    Single crystals of 0.1% Ce doped Li{sub 6}Y(BO{sub 3}){sub 3} have been grown using the Czochralski technique. The photoluminescence study of these crystals shows a broad emission at ? 420 nm corresponding to Ce{sub 3+} emission from 5d?4f energy levels. The decay profile of this emission shows a fast response of ? 28 ns which is highly desirable for detector applications.

  9. Higgs boson with a single generation in the bulk

    E-Print Network [OSTI]

    M. V. Libanov; E. Y. Nugaev

    2005-12-18

    We study Higgs boson properties in a model where three fermionic families of the Standard Model arise from a single generation in (5+1) dimensions. We demonstrate that, in spite of a non-trivial background, properties of the four-dimensional Higgs particle are almost indistinguishable from those in the Standard Model. We also argue that it is more natural to have a light Higgs boson in this model.

  10. A single crystalline porphyrinic titanium metal–organic framework

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

    Yuan, Shuai; Liu, Tian -Fu; Feng, Dawei; Tian, Jian; Wang, Kecheng; Qin, Junsheng; Zhang, Qiang; Chen, Ying -Pin; Bosch, Mathieu; Zou, Lanfang; et al

    2015-04-28

    We successfully assembled the photocatalytic titanium-oxo cluster and photosensitizing porphyrinic linker into a metal–organic framework (MOF), namely PCN-22. A preformed titanium-oxo carboxylate cluster is adopted as the starting material to judiciously control the MOF growth process to afford single crystals. This synthetic method is useful to obtain highly crystalline titanium MOFs, which has been a daunting challenge in this field. Moreover, PCN-22 demonstrated permanent porosity and photocatalytic activities toward alcohol oxidation.

  11. Single electron beam rf feedback free electron laser

    DOE Patents [OSTI]

    Brau, C.A.; Stein, W.E.; Rockwood, S.D.

    1981-02-11

    A free electron laser system and electron beam system for a free electron laser which uses rf feedback to enhance efficiency are described. Rf energy is extracted from a single electron beam by decelerating cavities and energy is returned to accelerating cavities using rf returns, such as rf waveguides, rf feedthroughs, resonant feedthroughs, etc. This rf energy is added to rf klystron energy to reduce the required input energy and thereby enhance energy efficiency of the system.

  12. Density Functional Theory with Dissipation: Transport through Single Molecules

    SciTech Connect (OSTI)

    Kieron Burke

    2012-04-30

    A huge amount of fundamental research was performed on this grant. Most of it focussed on fundamental issues of electronic structure calculations of transport through single molecules, using density functional theory. Achievements were: (1) First density functional theory with dissipation; (2) Pseudopotential plane wave calculations with master equation; (3) Weak bias limit; (4) Long-chain conductance; and (5) Self-interaction effects in tunneling.

  13. Nonlocality from N>2 independent single-photon emitters

    SciTech Connect (OSTI)

    Thiel, C.; Wiegner, R.; Zanthier, J. von [Institut fuer Optik, Information und Photonik, Universitaet Erlangen-Nuernberg, D-91058 Erlangen (Germany); Agarwal, G. S. [Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078-3072 (United States)

    2010-09-15

    We demonstrate that intensity correlations of second order in the fluorescence light of N>2 single-photon emitters may violate locality while the visibility of the signal remains below 1/{radical}(2){approx_equal}71%. For this, we derive a homogeneous Bell-Wigner-type inequality, which can be applied to a broad class of experimental setups. We trace the violation of this inequality back to path entanglement created by the process of detection.

  14. Permanent split capacitor single phase electric motor system

    DOE Patents [OSTI]

    Kirschbaum, H.S.

    1984-08-14

    A permanent split capacitor single phase electric motor achieves balanced operation at more than one operating point by adjusting the voltage supplied to the main and auxiliary windings and adjusting the capacitance in the auxiliary winding circuit. An intermediate voltage tap on an autotransformer supplies voltage to the main winding for low speed operation while a capacitive voltage divider is used to adjust the voltage supplied to the auxiliary winding for low speed operation. 4 figs.

  15. Production of single-walled carbon nanotube grids

    DOE Patents [OSTI]

    Hauge, Robert H; Xu, Ya-Qiong; Pheasant, Sean

    2013-12-03

    A method of forming a nanotube grid includes placing a plurality of catalyst nanoparticles on a grid framework, contacting the catalyst nanoparticles with a gas mixture that includes hydrogen and a carbon source in a reaction chamber, forming an activated gas from the gas mixture, heating the grid framework and activated gas, and controlling a growth time to generate a single-wall carbon nanotube array radially about the grid framework. A filter membrane may be produced by this method.

  16. Thermal efficiency of single-pass solar air collector

    SciTech Connect (OSTI)

    Ibrahim, Zamry; Ibarahim, Zahari; Yatim, Baharudin; Ruslan, Mohd Hafidz

    2013-11-27

    Efficiency of a finned single-pass solar air collector was studied. This paper presents the experimental study to investigate the effect of solar radiation and mass flow rate on efficiency. The fins attached at the back of absorbing plate to improve the thermal efficiency of the system. The results show that the efficiency is increased proportional to solar radiation and mass flow rate. Efficiency of the collector archived steady state when reach to certain value or can be said the maximum performance.

  17. Single Top and Higgs Production in $e^- p$ collisions

    E-Print Network [OSTI]

    Mukesh Kumar

    2015-06-12

    In this proceedings some studies on the prospects of single top production at the Large Hadron Electron Collider (LHeC) and double Higgs production at the Future Circular Hadron Electron Collider (FCC-he) shall be presented. In particular, we investigated the $tbW$ couplings via single top quark production with the introduction of possible anomalous Lorentz structures, and measured the sensitivity of the Higgs self coupling ($\\lambda$) through double Higgs production. The studies are performed with 60 GeV electrons colliding with 7 (50) TeV protons for the LHeC (FCC-he). For the single top studies a parton level study has been performed, and we find the sensitivity of the anomalous coupling at a 95\\% C.L, considering 10-1\\% systematic errors. The double Higgs production has been studied with speculated detector parameters and the sensitivity of $\\lambda$ estimated via the cross section study around the Standard Model Higgs self coupling strength ($\\lambda_{SM}$) considering 5\\% systematic error in signal and backgrounds. Effects of non-standard CP-even and CP-odd couplings for $hhh$, $hWW$ and $hhWW$ vertices have been studied and constrained at 95\\% C.L.

  18. Decoherence-Assisted Single Electron Trapping at Room Temperature

    E-Print Network [OSTI]

    Halawany, Ahmed El

    2011-01-01

    We consider the problem of single-electron tunneling through a nanowire (NW) made of a semiconductor quantum dot heterostructure at room temperature. We show that by applying a bias voltage across five quantum dots (QDs) and a gate voltage to the central QD to tune it in and out of resonance with respect to the other QDs it is possible to take advantage of a subtle combination of resonant tunneling, Coulomb blockade, Pauli exclusion principle, and decoherence effects to trap a single electron inside the central QD at room temperature. For calculating the decoherence-assisted quantum dynamics through the NW, we make use of a generalized master equation based on a Hamiltonian describing the tunneling of the electron among the QDs in the tight-binding approximation. We demonstrate that the decoherence, which is in the pico-second regime, is essential to trap the electron in the central QD with probability of 70% in 1 ps at room temperature. Our results can be used for future high-temperature single-photon source...

  19. Evidence for single top quark production using Bayesian neural networks

    SciTech Connect (OSTI)

    Kau, Daekwang; /Florida State U.

    2007-08-01

    We present results of a search for single top quark production in p{bar p} collisions using a dataset of approximately 1 fb{sup -1} collected with the D0 detector. This analysis considers the muon+jets and electron+jets final states and makes use of Bayesian neural networks to separate the expected signals from backgrounds. The observed excess is associated with a p-value of 0.081%, assuming the background-only hypothesis, which corresponds to an excess over background of 3.2 standard deviations for a Gaussian density. The p-value computed using the SM signal cross section of 2.9 pb is 1.6%, corresponding to an expected significance of 2.2 standard deviations. Assuming the observed excess is due to single top production, we measure a single top quark production cross section of {sigma}(p{bar p} {yields} tb + X, tqb + X) = 4.4 {+-} 1.5 pb.

  20. Application of a single multivariable controller to an FCCU

    SciTech Connect (OSTI)

    Cutler, C.R.; Johnston, C.R.; Raven, D.B. (Dynamic Matrix Control Corp., Houston, TX (United States)); Eakens, R.W.; Koepke, J. (Star Enterprise, Port Arthur, TX (United States)); Alrushaid, N. (Saudi ARAMCO, Ras Tanura (Saudi Arabia))

    1993-01-01

    A number of significant benefits are realized from the design and operation of a single multivariable controller for a Fluid Catalytic Cracking Unit. A single controller has been built for the Star Enterprise FCCU No. 3 in Port Arthur, Texas. The controller includes the Feed Preheat System, the Reactor, the Regenerator, the Main Fractionator, and the Wet Gas Compression. The controller contains 17 manipulated variables, 41 controlled variables, and 1 disturbance variable. The elapse time between project initiation and final commissioning was four months including a one month delay for unit maintenance. After commissioning, it was determined in the post audit that the simple payout for the project was less than one month. The controller has maintained a high stream factor since its commissioning 8 months ago. The single large scale controller improves the reliability of the control system, permits the handling of all the interactions between independent variables, removes stability analysis from the controller design, increases the ability of the controller to address the economics of the operation, and increases the maintainability of the system relative to traditional heuristic combinations of PID controllers.

  1. Single microbe trap and release in sub-microfluidics

    SciTech Connect (OSTI)

    Vasdekis, Andreas E.

    2013-05-08

    Lab-on-a-chip systems have substantially impacted the way life-sciences are explored; life on earth, however, comprises mostly of microbes, which due to their sub-micron dimensions and high mobility are more challenging to dynamically manipulate on-a-chip. To address this challenge, we developed a high resolution microfluidic system (submicrofluidics) fabricated by direct electron beam lithography that is capable of trapping single microbes and releasing them upon demand. The fabrication method enabled the integration of sub-micron indentations (400 nm) with millimetre-scale fluidic channels rapidly in a single processing step. The larger channels deliver the cell suspension and reagents, while the sub-micron indentations immobilize the cells by locally increasing the hydrodynamic resistance. By volume exclusion, single cell trapping was possible in this system without any surface treatment. By increasing the flow rate, the microbes overcome the trap barrier and pass through the narrow indentation without undergoing lysis with kinetics that depend on their size. The fabrication method and its performance are described, along with microbial characterisations using E. coli.

  2. Stylized features of single-nucleon momentum distributions

    E-Print Network [OSTI]

    Vanhalst, Maarten; Ryckebusch, Jan

    2014-01-01

    [Background:] Nuclear short-range correlations (SRC) typically manifest themselves in the tail parts of the single-nucleon momentum distributions. [Purpose:] To develop an approximate flexible method for computing the single-nucleon momentum distributions throughout the whole mass table, thereby including the majority of the effects of SRC. To use this method to study the mass and isospin dependence of SRC. [Method:] The low-order cluster approximation (LCA) adopted in this work, corrects mean-field models for correlations by shifting the complexity induced by the SRC from the wave functions to the operators. Due to the local character of the SRC, it is argued that the expansion of these operators can be truncated to a low order. [Results:] After inclusion of the central and tensor correlations, the LCA can generate the SRC-related features of the single-nucleon momentum distribution like the high-momentum tails. These are dominated by correlations operating on mean-field pairs with vanishing relative radial ...

  3. Review of Methods to Probe Single Cell Metabolism and Bioenergetics

    SciTech Connect (OSTI)

    Vasdekis, Andreas E.; Stephanopoulos, Gregory

    2015-01-01

    The sampling and manipulation of cells down to the individual has been of substantial interest since the very beginning of Life Sciences. Herein, our objective is to highlight the most recent developments in single cell manipulation, as well as pioneering ones. First, flow-through methods will be discussed, namely methods in which the single cells flow continuously in an ordered manner during their analysis. This section will be followed by confinement techniques that enable cell isolation and confinement in one, two- or three-dimensions. Flow cytometry and droplet microfluidics are the two most common methods of flow-through analysis. While both are high-throughput techniques, their difference lays in the fact that the droplet encapsulated cells experience a restricted and personal microenvironment, while in flow cytometry cells experience similar nutrient and stimuli initial concentrations. These methods are rather well established; however, they recently enabled immense strides in single cell phenotypic analysis, namely the identification and analysis of metabolically distinct individuals from an isogenic population using both droplet microfluidics and flow cytometry.

  4. Single beam Fourier transform digital holographic quantitative phase microscopy

    SciTech Connect (OSTI)

    Anand, A. Chhaniwal, V. K.; Mahajan, S.; Trivedi, V.; Faridian, A.; Pedrini, G.; Osten, W.; Dubey, S. K.; Javidi, B.

    2014-03-10

    Quantitative phase contrast microscopy reveals thickness or height information of a biological or technical micro-object under investigation. The information obtained from this process provides a means to study their dynamics. Digital holographic (DH) microscopy is one of the most used, state of the art single-shot quantitative techniques for three dimensional imaging of living cells. Conventional off axis DH microscopy directly provides phase contrast images of the objects. However, this process requires two separate beams and their ratio adjustment for high contrast interference fringes. Also the use of two separate beams may make the system more vulnerable to vibrations. Single beam techniques can overcome these hurdles while remaining compact as well. Here, we describe the development of a single beam DH microscope providing whole field imaging of micro-objects. A hologram of the magnified object projected on to a diffuser co-located with a pinhole is recorded with the use of a commercially available diode laser and an arrayed sensor. A Fourier transform of the recorded hologram directly yields the complex amplitude at the image plane. The method proposed was investigated using various phase objects. It was also used to image the dynamics of human red blood cells in which sub-micrometer level thickness variation were measurable.

  5. Does a single eigenstate encode the full Hamiltonian?

    E-Print Network [OSTI]

    James R. Garrison; Tarun Grover

    2015-03-02

    The Eigenstate Thermalization Hypothesis (ETH) posits that the reduced density matrix for a subsystem corresponding to an excited eigenstate is "thermal". Here we expound on this hypothesis by asking: for which class of operators, local or non-local, is ETH satisfied? We show that this question is directly related to a seemingly unrelated question: is the Hamiltonian of a system encoded within a single eigenstate? We formulate a strong form of ETH where in the thermodynamic limit, the reduced density matrix of a subsystem corresponding to a pure, finite energy density eigenstate asymptotically becomes equal to the thermal reduced density matrix, as long as certain conditions on the ratio of the subsystem size to the total system size are satisfied. This allows one to access the properties of the underlying Hamiltonian at arbitrary energy densities/temperatures using just a single eigenstate. We provide support for our conjecture by performing an exact diagonalization study of a non-integrable 1D lattice quantum model with only energy conservation. For this particular model, we provide evidence that the aforementioned strong form of ETH holds up to finite size corrections, which enables us to extract the free energy density and correlators of operators at various temperatures using a single eigenstate. We also study a particle number conserving model at infinite temperature which also substantiates our conjecture.

  6. Interfacial dislocation motion and interactions in single-crystal superalloys

    SciTech Connect (OSTI)

    Liu, B. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Raabe, D. [Max Planck Inst. fur Eisenforshung. Dusseldorf (Germany); Roters, F. [Max Planck Inst. fur Eisenforshung. Dusseldorf (Germany); Arsenlis, A. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2014-10-01

    The early stage of high-temperature low-stress creep in single-crystal superalloys is characterized by the rapid development of interfacial dislocation networks. Although interfacial motion and dynamic recovery of these dislocation networks have long been expected to control the subsequent creep behavior, direct observation and hence in-depth understanding of such processes has not been achieved. Incorporating recent developments of discrete dislocation dynamics models, we simulate interfacial dislocation motion in the channel structures of single-crystal superalloys, and investigate how interfacial dislocation motion and dynamic recovery are affected by interfacial dislocation interactions and lattice misfit. Different types of dislocation interactions are considered: self, collinear, coplanar, Lomer junction, glissile junction, and Hirth junction. The simulation results show that strong dynamic recovery occurs due to the short-range reactions of collinear annihilation and Lomer junction formation. The misfit stress is found to induce and accelerate dynamic recovery of interfacial dislocation networks involving self-interaction and Hirth junction formation, but slow down the steady interfacial motion of coplanar and glissile junction forming dislocation networks. The insights gained from these simulations on high-temperature low-stress creep of single-crystal superalloys are also discussed.

  7. Unified single-photon and single-electron counting statistics: from cavity-QED to electron transport

    E-Print Network [OSTI]

    Lambert, Neill; Nori, Franco

    2010-01-01

    A key ingredient of cavity quantum-electrodynamics (QED) is the coupling between the discrete energy levels of an atom and photons in a single-mode cavity. The addition of periodic ultra-short laser pulses allows one to use such a system as a source of single photons; a vital ingredient in quantum information and optical computing schemes. Here, we analyze and ``time-adjust'' the photon-counting statistics of such a single-photon source, and show that the photon statistics can be described by a simple `transport-like' non-equilibrium model. We then show that there is a one-to-one correspondence of this model to that of non-equilibrium transport of electrons through a double quantum dot nanostructure. Then we prove that the statistics of the tunnelling electrons is equivalent to the statistics of the emitted photons. This represents a unification of the fields of photon counting statistics and electron transport statistics. This correspondence empowers us to adapt several tools previously used for detecting qu...

  8. Creation and recovery of a W(111) single atom gas field ion source

    SciTech Connect (OSTI)

    Pitters, Jason L. [National Institute for Nanotechnology, National Research Council of Canada, Edmonton, Alberta T6G 2M9 (Canada); Urban, Radovan [Department of Physics, University of Alberta, Edmonton, Alberta T6G 2G7 (Canada); Wolkow, Robert A. [National Institute for Nanotechnology, National Research Council of Canada, Edmonton, Alberta T6G 2M9 (Canada); Department of Physics, University of Alberta, Edmonton, Alberta T6G 2G7 (Canada)

    2012-04-21

    Tungsten single atom tips have been prepared from a single crystal W(111) oriented wire using the chemical assisted field evaporation and etching method. Etching to a single atom tip occurs through a symmetric structure and leads to a predictable last atom unlike etching with polycrystalline tips. The single atom tip formation procedure is shown in an atom by atom removal process. Rebuilds of single atom tips occur on the same crystalline axis as the original tip such that ion emission emanates along a fixed direction for all tip rebuilds. This preparation method could be utilized and developed to prepare single atom tips for ion source development.

  9. Single Particle Fragmentation in Ultrasound Assisted Impact Comminution

    E-Print Network [OSTI]

    Wittel, Falk K

    2015-01-01

    Impact fragmentation is the underlying principle of comminution milling of dry, bulk solids. Unfortunately the outcome of the fragmentation process is more or less determined by the dimensionality of the impactor and its impact velocity. Since fragmentation is dominated by interfering shock waves, manipulating traveling shock waves and adding energy to the system during its fragmentation could be a promising approach to manipulate fragment mass distributions and energy input. In a former study we explored mechanisms in impact fragmentation of spheres, using a three-dimensional Discrete Element Model (DEM). This work is focused on studying how single spheres fragment when impacted on a planar vibrating target.

  10. Nonvanishing of the Collins mechanism for single spin asymmetries

    SciTech Connect (OSTI)

    Leader, Elliot [Imperial College London, Prince Consort Road, London SW7 2BW (United Kingdom)

    2004-09-01

    The Collins mechanism provides a nonperturbative explanation for the large single-spin asymmetries found in hard semi-inclusive reactions involving a transversely polarized nucleon. However, there are seemingly convincing reasons to suspect that the mechanism vanishes, and indeed it does vanish in the naive parton model where a quark is regarded as an essentially free particle. We give an intuitive analysis which highlights the difference between the naive picture and the realistic one and shows how the Collins mechanism arises when the quark is described as an off-shell particle by a field in interaction.

  11. Retrofit Analysis of Older, Single Family Housing in San Antonio 

    E-Print Network [OSTI]

    Rashed-Ali, H.

    2013-01-01

    -12-05 CATEE 2013: Clean Air Through Energy Efficiency Conference, San Antonio, Texas Dec. 16-18 Study Findings • Additional Possible Retrofits: – Whole house fans: • Initial cost approximately $1,000 – Window replacement: • Initial cost approximately $5..., Single Family Housing in San Antonio Hazem Rashed-Ali, PhD, University of Texas at San Antonio CATEE 2013 Clean Air Through Energy Efficiency Conference December 16-18, 2013 San Antonio, TX 12/17/2013 ESL-KT-13-12-05 CATEE 2013: Clean Air Through Energy...

  12. Parallel Hall effect from 3D single-component metamaterials

    E-Print Network [OSTI]

    Kern, Christian; Wegener, Martin

    2015-01-01

    We propose a class of three-dimensional metamaterial architectures composed of a single doped semiconductor (e.g., n-Si) in air or vacuum that lead to unusual effective behavior of the classical Hall effect. Using an anisotropic structure, we numerically demonstrate a Hall voltage that is parallel---rather than orthogonal---to the external static magnetic-field vector ("parallel Hall effect"). The sign of this parallel Hall voltage can be determined by a structure parameter. Together with the previously demonstrated positive or negative orthogonal Hall voltage, we demonstrate four different sign combinations

  13. Evaluation of entanglement measures by a single observable

    E-Print Network [OSTI]

    Chengjie Zhang; Sixia Yu; Qing Chen; Haidong Yuan; C. H. Oh

    2015-06-04

    We present observable lower bounds for several entanglement measures including entanglement of formation, geometric measure of entanglement, concurrence, and convex-roof extended negativity. The lower bounds facilitate estimates of these entanglement measures for arbitrary finite-dimensional bipartite states. Moreover, these lower bounds can be easily obtained from the expectation value of a single observable, and the optimal lower bounds relate to fully entangled fraction. Based on our results, we use the real experimental measurement data reported by Tonolini \\textit{et al.} [Sci. Rep. \\textbf{4}, 6542 (2014)] to get the lower bounds of entanglement measures for their experimentally realized state. In addition, we also study the relations between entanglement measures.

  14. Optimised quantum hacking of superconducting nanowire single-photon detectors

    E-Print Network [OSTI]

    Tanner, Michael G; Hadfield, Robert H

    2013-01-01

    We explore optimised control of superconducting nanowire single-photon detectors (SNSPDs) through bright illumination. We consider the behaviour of the SNSPD in the shunted configuration (a practical measure to avoid latching) in long-running quantum key distribution experiments. We propose and demonstrate an effective bright-light attack on this realistic configuration, by applying transient blinding illumination lasting for a fraction of a microsecond and producing several deterministic fake clicks during this time. We show that this attack does not lead to elevated timing jitter in the spoofed output pulse, and is hence not introducing significant errors. Five different SNSPD chip designs were tested. We consider possible countermeasures to this attack.

  15. Optimised quantum hacking of superconducting nanowire single-photon detectors

    E-Print Network [OSTI]

    Michael G. Tanner; Vadim Makarov; Robert H. Hadfield

    2014-04-07

    We explore bright-light control of superconducting nanowire single-photon detectors (SNSPDs) in the shunted configuration (a practical measure to avoid latching). In an experiment, we simulate an illumination pattern the SNSPD would receive in a typical quantum key distribution system under hacking attack. We show that it effectively blinds and controls the SNSPD. The transient blinding illumination lasts for a fraction of a microsecond and produces several deterministic fake clicks during this time. This attack does not lead to elevated timing jitter in the spoofed output pulse, and hence does not introduce significant errors. Five different SNSPD chip designs were tested. We consider possible countermeasures to this attack.

  16. Full light absorption in single arrays of spherical nanoparticles

    E-Print Network [OSTI]

    Ra'di, Y; Kosulnikov, S U; Omelyanovich, M M; Morits, D; Osipov, A V; Simovski, C R; Tretyakov, S A

    2015-01-01

    In this paper we show that arrays of core-shell nanoparticles function as effective thin absorbers of light. In contrast to known metamaterial absorbers, the introduced absorbers are formed by single planar arrays of spherical inclusions and enable full absorption of light incident on either or both sides of the array. We demonstrate possibilities for realizing different kinds of symmetric absorbers, including resonant, ultra-broadband, angularly selective, and all-angle absorbers. The physical principle behind these designs is explained considering balanced electric and magnetic responses of unit cells. Photovoltaic devices and thermal emitters are the two most important potential applications of the proposed designs.

  17. Electromagnetically Induced Transparency from a Single Atom in Free Space

    E-Print Network [OSTI]

    L. Slodicka; G. Hetet; S. Gerber; M. Hennrich; R. Blatt

    2010-05-18

    We report an absorption spectroscopy experiment and the observation of electromagnetically induced transparency from a single trapped atom. We focus a weak and narrowband Gaussian light beam onto an optically cooled Barium ion using a high numerical aperture lens. Extinction of this beam is observed with measured values of up to 1.3 %. We demonstrate electromagnetically induced transparency of the ion by tuning a strong control beam over a two-photon resonance in a three-level lambda-type system. The probe beam extinction is inhibited by more than 75 % due to population trapping.

  18. Single phase four pole/six pole motor

    DOE Patents [OSTI]

    Kirschbaum, H.S.

    1984-10-09

    A single phase alternating current electric motor is provided with a main stator winding having two coil groups each including the series connection of three coils. These coil groups can be connected in series for six pole operation and in parallel for four pole operation. The coils are approximately equally spaced around the periphery of the machine but are not of equal numbers of turns. The two coil groups are identically wound and spaced 180 mechanical degrees apart. One coil of each group has more turns and a greater span than the other two coils. 10 figs.

  19. Single phase two pole/six pole motor

    DOE Patents [OSTI]

    Kirschbaum, H.S.

    1984-09-25

    A single phase alternating current two pole/six pole motor is provided with a main stator winding having six coils disposed unequally around the periphery of the machine. These coils are divided into two groups. When these groups are connected such that their magnetomotive forces are additive, two pole motor operation results. When the polarity of one of the groups is then reversed, six pole motor operation results. An auxiliary stator winding which is similar to the main stator winding is displaced from the main stator winding by 90 electrical degrees on a two pole basis. 12 figs.

  20. A spintronic source of circularly polarized single photons

    E-Print Network [OSTI]

    Pablo Asshoff; Andreas Merz; Heinz Kalt; Michael Hetterich

    2011-03-06

    We present a spintronic single photon source which emits circularly polarized light, where the helicity is determined by an applied magnetic field. Photons are emitted from an InGaAs quantum dot inside an electrically operated spin light-emitting diode, which comprises the diluted magnetic semiconductor ZnMnSe. The circular polarization degree of the emitted light is high, reaching 83% at an applied magnetic field of 2T and 96% at 6 T. Autocorrelation traces recorded in pulsed operation mode prove the emitted light to be antibunched. The two circular polarization states could be used for representing quantum states |0> and |1> in quantum cryptography implementations.

  1. A spintronic source of circularly polarized single photons

    E-Print Network [OSTI]

    Asshoff, Pablo; Kalt, Heinz; Hetterich, Michael

    2011-01-01

    We present a spintronic single photon source which emits circularly polarized light, where the helicity is determined by an applied magnetic field. Photons are emitted from an InGaAs quantum dot inside an electrically operated spin light-emitting diode, which comprises the diluted magnetic semiconductor ZnMnSe. The circular polarization degree of the emitted light is high, reaching 83% at an applied magnetic field of 2T and 96% at 6 T. Autocorrelation traces recorded in pulsed operation mode prove the emitted light to be antibunched. The two circular polarization states could be used for representing quantum states |0> and |1> in quantum cryptography implementations.

  2. Maass Cusp Forms on Singly Punctured Two-Torus

    SciTech Connect (OSTI)

    Siddig, Abubaker Ahmed Mohamed [Laboratory of Computational Sciences and Informatics, Institute for Mathematical Research Universiti Putra Malaysia, 43400 UPM Serdang, Selangor (Malaysia); Shah, Nurisya Mohd [Theoretical Physics Group, Department of Physics, Faculty of Science Universiti Putra Malaysia, 43400 UPM Serdang, Selangor (Malaysia); Zainuddin, Hishamuddin [Laboratory of Computational Sciences and Informatics, Institute for Mathematical Research Universiti Putra Malaysia, 43400 UPM Serdang, Selangor (Malaysia); Theoretical Physics Group, Department of Physics, Faculty of Science Universiti Putra Malaysia, 43400 UPM Serdang, Selangor (Malaysia)

    2009-07-07

    Quantum mechanical systems on punctured surfaces modeled by hyperbolic spaces can play an interesting role in exploring quantum chaos and in studying behaviour of future quantum nano-devices. The case of singly-punctured two-torus, for example, has been well-studied in the literature particularly for its scattering states. However, the bound states on the punctured torus given by Maass cusp forms are lesser known. In this note, we report on the algorithm of numerically computing these functions and we present ten lower-lying eigenvalues for each odd and even Maass cusp forms.

  3. Photoproduction of electron-positron pairs in bent single crystals

    E-Print Network [OSTI]

    Chesnokov, Yu A; Bolognini, D; Hasan, S; Prest, M; Vallazza, E

    2010-01-01

    The process of photoproduction of electron-positron pairs in bent single crystals is considered in this paper. In particular, it is shown that the probability of the process for gamma-quanta with energies from 100 GeV on is significantly higher than the one in an amorphous medium. A possible scenario for the experimental validation of the process is discussed and the positive features of the photoproduction in bent crystals compared to straight ones are underlined from the point of view of possible applications.

  4. Lithium niobate single-crystal and photo-functional device

    DOE Patents [OSTI]

    Gopalan, Venkatraman (State College, PA); Mitchell, Terrence E. (Los Alamos, NM); Kitamura, Kenji (Tsukuba, JP); Furukawa, Yasunori (Tsukuba, JP)

    2001-01-01

    Provided are lithium niobate single-crystal that requires a low voltage of not larger than 10 kV/nm for its ferroelectric polarization inversion and of which the polarization can be periodically inverted with accuracy even at such a low voltage, and a photo-functional device comprising the crystal. The crystal has a molar fraction of Li.sub.2 O/(Nb.sub.2 O.sub.5 +Li.sub.2 O) of falling between 0.49 and 0.52. The photo-functional device can convert a laser ray being incident thereon.

  5. Single and multiple intrabeam scattering in hadron colliders

    SciTech Connect (OSTI)

    Lebedev, V.; /Fermilab

    2005-01-01

    Single and multiple intra-beam scattering are usually considered separately. Such separation works well for electron-positron colliders but usually yields only coarse description in the case of hadron colliders. Boltzmann type integro-differential equation is used to describe evolution of longitudinal distribution due to IBS. The finite size of the longitudinal potential well, its non-linearity and x-y coupling are taken into account. The model predictions for longitudinal and transverse distributions are compared to the experimental measurements.

  6. Excitation of two atoms by a propagating single photon pulse

    E-Print Network [OSTI]

    Navneeth Ramakrishnan; Yimin Wang; Valerio Scarani

    2014-11-13

    We describe the interaction of two two-level atoms in free space with propagating modes of the quantized electromagnetic field, using the time-dependent Heisenberg-Langevin method. For single- photon pulses, we consider the effect of the pulse's spatial and temporal profiles on the atomic excitation. In particular, we find the ideal shape for a pulse to put exactly one excitation in any desired state of the bi-atomic system. Furthermore, we analyze the differences in the atomic dynamics between the cases of Fock state pulses and coherent state pulses.

  7. High performance static latches with complete single event upset immunity

    DOE Patents [OSTI]

    Corbett, Wayne T. (Albuquerque, NM); Weaver, Harry T. (Albuquerque, NM)

    1994-01-01

    An asymmetric response latch providing immunity to single event upset without loss of speed. The latch has cross-coupled inverters having a hardened logic state and a soft state, wherein the logic state of the first inverter can only be changed when the voltage on the coupling node of that inverter is low and the logic state of the second inverter can only be changed when the coupling of that inverter is high. One of more of the asymmetric response latches may be configured into a memory cell having complete immunity, which protects information rather than logic states.

  8. Acquisition of Single Crystal Growth and Characterization Equipment

    SciTech Connect (OSTI)

    Maple, M. Brian; Zocco, Diego A.

    2008-12-09

    Final Report for DOE Grant No. DE-FG02-04ER46178 'Acquisition of Single Crystal Growth and Characterization Equipment'. There is growing concern in the condensed matter community that the need for quality crystal growth and materials preparation laboratories is not being met in the United States. It has been suggested that there are too many researchers performing measurements on too few materials. As a result, many user facilities are not being used optimally. The number of proficient crystal growers is too small. In addition, insufficient attention is being paid to the enterprise of finding new and interesting materials, which is the driving force behind much of condensed matter research and, ultimately, technology. While a detailed assessment of this situation is clearly needed, enough evidence of a problem already exists to compel a general consensus that the situation must be addressed promptly. This final report describes the work carried out during the last four years in our group, in which a state-of-the-art single crystal growth and characterization facility was established for the study of novel oxides and intermetallic compounds of rare earth, actinide and transition metal elements. Research emphasis is on the physics of superconducting (SC), magnetic, heavy fermion (HF), non-Fermi liquid (NFL) and other types of strongly correlated electron phenomena in bulk single crystals. Properties of these materials are being studied as a function of concentration of chemical constituents, temperature, pressure, and magnetic field, which provide information about the electronic, lattice, and magnetic excitations at the root of various strongly correlated electron phenomena. Most importantly, the facility makes possible the investigation of material properties that can only be achieved in high quality bulk single crystals, including magnetic and transport phenomena, studies of the effects of disorder, properties in the clean limit, and spectroscopic and scattering studies through efforts with numerous collaborators. These endeavors will assist the effort to explain various outstanding theoretical problems, such as order parameter symmetries and electron-pairing mechanisms in unconventional superconductors, the relationship between superconductivity and magnetic order in certain correlated electron systems, the role of disorder in non-Fermi liquid behavior and unconventional superconductivity, and the nature of interactions between localized and itinerant electrons in these materials. Understanding the mechanisms behind strongly correlated electron behavior has important technological implications.

  9. Single particle spectra based of modern effective interactions

    E-Print Network [OSTI]

    C. Barbieri

    2006-04-03

    The self-consistent Green's function method is applied to 16O using a G-matrix and Vucom as effective interactions, both derived from the Argonne v18 potential. The present calculations are performed in a larger model space than previously possible. The experimental single particle spectra obtained with the G-matrix are essentially independent of the oscillator length of the basis. The results shows that Vucom better reproduces spin-orbit splittings but tends to overestimate the gap at the Fermi energy.

  10. Single phase flow visualization using Digital Pulsed Laser Velocimetry 

    E-Print Network [OSTI]

    Hild, Robert David

    1989-01-01

    for Single Phase Flow: Experiment z511m-z511r. . . . X. 4 Velocity Vectors for Two Phase Flow: Experiment z726a-z726f (Sigma Cutoff=10. 0) . X. 5 Velocity Vecttus for Two Phase Flow: Experiment z726a-z726f (Sigma Cutoff=0. 020) . 83 . . . 84 96 97... captured. This code was originally intended for six frames of video to be analyzed, however, it was written to accept a variable number of frames greater than four. It has been tested on six, nine, and ten frames of video and performs correctly; 9...

  11. Healing of graphene on single crystalline Ni(111) films

    SciTech Connect (OSTI)

    Zeller, Patrick; Wintterlin, Joost; Speck, Florian; Ostler, Markus; Weinl, Michael; Schreck, Matthias; Seyller, Thomas

    2014-11-10

    The annealing of graphene layers grown on 150?nm thick single crystal Ni(111) films was investigated in situ by low energy electron microscopy and photoemission electron microscopy. After growth, by means of chemical vapor deposition of ethylene, the graphene layers consist of several domains showing different orientations with respect to the underlying Ni surface and also of small bilayer areas. It is shown that, in a controlled process, the rotated domains can be transformed into lattice-aligned graphene, and the bilayer areas can be selectively dissolved, so that exclusively the aligned monolayer graphene is obtained. The ordering mechanism involves transport of C atoms across the surface and solution in the bulk.

  12. Single-poly EEPROM cell with lightly doped MOS capacitors

    DOE Patents [OSTI]

    Riekels, James E. (New Hope, MN); Lucking, Thomas B. (Maple Grove, MN); Larsen, Bradley J. (Mound, MN); Gardner, Gary R. (Golden Valley, MN)

    2008-05-27

    An Electrically Erasable Programmable Read Only Memory (EEPROM) memory cell and a method of operation are disclosed for creating an EEPROM memory cell in a standard CMOS process. A single polysilicon layer is used in combination with lightly doped MOS capacitors. The lightly doped capacitors employed in the EEPROM memory cell can be asymmetrical in design. Asymmetrical capacitors reduce area. Further capacitance variation caused by inversion can also be reduced by using multiple control capacitors. In addition, the use of multiple tunneling capacitors provides the benefit of customized tunneling paths.

  13. MCMC methods for wavelet representations in single index models 

    E-Print Network [OSTI]

    Park, Chun Gun

    2004-09-30

    the function: one in which all wavelet coef cients are used in the series, and another that allows for shrinkage rules. We propose posterior inference for the two wavelet representations of the function. To implement posterior inference, we de ne a hierarchial... resolution level. In wavelet shrinkage rules we use ?pseudo-priors? for a zero coef cient. In single index models a direction b affects estimates of the function. Transforming b to a spherical polar coordinate q is a convenient way of imposing the constraint...

  14. Poisson-Fermi Model of Single Ion Activities

    E-Print Network [OSTI]

    Liu, Jinn-Liang

    2015-01-01

    A Poisson-Fermi model is proposed for calculating activity coefficients of single ions in strong electrolyte solutions based on the experimental Born radii and hydration shells of ions in aqueous solutions. The steric effect of water molecules and interstitial voids in the first and second hydration shells play an important role in our model. The screening and polarization effects of water are also included in the model that can thus describe spatial variations of dielectric permittivity, water density, void volume, and ionic concentration. The activity coefficients obtained by the Poisson-Fermi model with only one adjustable parameter are shown to agree with experimental data, which vary nonmonotonically with salt concentrations.

  15. Analysis of single particle trajectories: when things go wrong

    E-Print Network [OSTI]

    D. Holcman; N. Hoze; Z. Schuss

    2015-02-01

    To recover the long-time behavior and the statistics of molecular trajectories from the large number (tens of thousands) of their short fragments, obtained by super-resolution methods at the single molecule level, data analysis based on a stochastic model of their non-equilibrium motion is required. Recently, we characterized the local biophysical properties underlying receptor motion based on coarse-grained long-range interactions, corresponding to attracting potential wells of large sizes. The purpose of this letter is to discuss optimal estimators and show what happens when thing goes wrong.

  16. Single-shot 35 fs temporal resolution electron shadowgraphy

    SciTech Connect (OSTI)

    Scoby, C. M.; Li, R. K.; Threlkeld, E.; To, H.; Musumeci, P. [Department of Physics and Astronomy, UCLA, Los Angeles, California 90095 (United States)] [Department of Physics and Astronomy, UCLA, Los Angeles, California 90095 (United States)

    2013-01-14

    We obtain single-shot time-resolved shadowgraph images of the electromagnetic fields resulting from the interaction of a high intensity ultrashort laser pulse with a metal surface. Using a high brightness relativistic electron beam and a high streaking speed radiofrequency deflector, we report <35 fs temporal resolution enabling a direct visualization of the retarded-time dominated field evolution which follows the laser-induced charge emission. A model including the finite signal propagation speed well reproduces the data and yields measurements of fundamental parameters in short pulse laser-matter interaction such as the amount of emitted charge and the emission time scale.

  17. Testing for new physics in singly Cabibbo suppressed D decays

    E-Print Network [OSTI]

    Yuval Grossman; Alexander L. Kagan; Jure Zupan

    2012-04-16

    We devise tests for a new physics origin of the recently measured direct CP violation in singly Cabibbo suppressed D decays. The tests take the form of sum rules for the CP asymmetries in various D decays. They are based on the fact that within the standard model CP violation arises from interference of the dominant tree amplitudes with the Delta I=1/2 penguin amplitudes. The sum rules would be violated if the observed CP violation is due to new physics contributions to the effective weak Hamiltonian that change isospin by Delta I=3/2.

  18. FLAMMABLE GAS DIFFUSION THROUGH SINGLE SHELL TANK (SST) DOMES

    SciTech Connect (OSTI)

    MEACHAM, J.E.

    2003-11-10

    This report quantified potential hydrogen diffusion through Hanford Site Single-Shell tank (SST) domes if the SSTs were hypothetically sealed airtight. Results showed that diffusion would keep headspace flammable gas concentrations below the lower flammability limit in the 241-AX and 241-SX SST. The purpose of this document is to quantify the amount of hydrogen that could diffuse through the domes of the SSTs if they were hypothetically sealed airtight. Diffusion is assumed to be the only mechanism available to reduce flammable gas concentrations. The scope of this report is limited to the 149 SSTs.

  19. Energy dissipation in single-domain ferromagnetic nanoparticles: Dynamical approach

    E-Print Network [OSTI]

    T. V. Lyutyy; S. I. Denisov; A. Yu. Peletskyi; C. Binns

    2015-02-14

    We study, both analytically and numerically, the phenomenon of energy dissipation in single-domain ferromagnetic nanoparticles driven by an alternating magnetic field. Our interest is focused on the power loss resulting from the Landau-Lifshitz-Gilbert equation, which describes the precessional motion of the nanoparticle magnetic moment. We determine the power loss as a function of the field amplitude and frequency and analyze its dependence on different regimes of forced precession induced by circularly and linearly polarized magnetic fields. The conditions to maximize the nanoparticle heating are also analyzed.

  20. Entanglement and the Phase Transition in Single Mode Superradiance

    E-Print Network [OSTI]

    Neill Lambert; Clive Emary; Tobias Brandes

    2003-09-02

    We consider the entanglement properties of the quantum phase transition in the single-mode superradiance model, involving the interaction of a boson mode and an ensemble of atoms. For infinite system size, the atom-field entanglement of formation diverges logarithmically with the correlation length exponent. Using a continuous variable representation, we compare this to the divergence of the entropy in conformal field theories, and derive an exact expression for the scaled concurrence and the cusp-like non-analyticity of the momentum squeezing.

  1. Single zymomonas mobilis strain for xylose and arabinose fermentation

    DOE Patents [OSTI]

    Zhang, Min (Lakewood, CO); Chou, Yat-Chen (Wheat Ridge, CO); Picataggio, Stephen K. (Landenberg, PA); Finkelstein, Mark (Fort Collins, CO)

    1998-01-01

    This invention relates to single microorganisms which normally do not ferment pentose sugars which are genetically altered to ferment the pentose sugars, xylose and arabinose, to produce ethanol, and a fermentation process utilizing the same. Examples include Zymomonas mobilis which has been transformed with a combination of E. coli genes for xylose isomerase, xylulokinase, L-arabinose isomerase, L-ribulokinase, L-ribulose 5-phosphate 4-epimerase, transaldolase and transketolase. Expression of added genes are under the control of Z. mobilis promoters. These newly created microorganisms are useful for fermenting glucose, xylose and arabinose, produced by hydrolysis of hemicellulose and cellulose or starch, to produce ethanol.

  2. Six pole/eight pole single-phase motor

    DOE Patents [OSTI]

    Kirschbaum, Herbert S. (Asheville, NC)

    1984-01-01

    A single phase alternating current electric motor is provided with a main stator winding having two coil groups which are connected to form eight poles for eight-pole operation and to form six poles for six-pole operation. Each group contains four series connected coil elements with each element spanning approximately one-seventh of the periphery of the machine. The coil groups are spaced 180 mechanical degrees apart such that each end coil of one group overlaps one of the end coils of the other group. An auxiliary stator winding having two coil groups with the same relative angular displacement as the main stator winding coil groups is included.

  3. File:RAPID Single Slide.pdf | 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 Home Page on QA:QAsource History View New Pages Recent ChangesPower-in-practice-and-theory-teacher.pdf JumpSingle Slide.pdf Jump to:

  4. ARM - Field Campaign - Single Frequency GPS Water Vapor Network

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

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  5. ARM - Field Campaign - Spring Single Column Model IOP

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

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  6. ARM - Field Campaign - Summer 1994 Single Column Model IOP

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

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  7. ARM - Field Campaign - Summer 1995 Single Column Model IOP

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

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  8. ARM - Field Campaign - Summer Single Column Model IOP

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  9. World's largest single crystal of gold verified at Los Alamos

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

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  10. Methods of forming single source precursors, methods of forming polymeric single source precursors, and single source precursors and intermediate products formed by such methods

    DOE Patents [OSTI]

    Fox, Robert V.; Rodriguez, Rene G.; Pak, Joshua J.; Sun, Chivin; Margulieux, Kelsey R.; Holland, Andrew W.

    2012-12-04

    Methods of forming single source precursors (SSPs) include forming intermediate products having the empirical formula 1/2{L.sub.2N(.mu.-X).sub.2M'X.sub.2}.sub.2, and reacting MER with the intermediate products to form SSPs of the formula L.sub.2N(.mu.-ER).sub.2M'(ER).sub.2, wherein L is a Lewis base, M is a Group IA atom, N is a Group IB atom, M' is a Group IIIB atom, each E is a Group VIB atom, each X is a Group VIIA atom or a nitrate group, and each R group is an alkyl, aryl, vinyl, (per)fluoro alkyl, (per)fluoro aryl, silane, or carbamato group. Methods of forming polymeric or copolymeric SSPs include reacting at least one of HE.sup.1R.sup.1E.sup.1H and MER with one or more substances having the empirical formula L.sub.2N(.mu.-ER).sub.2M'(ER).sub.2 or L.sub.2N(.mu.-X).sub.2M'(X).sub.2 to form a polymeric or copolymeric SSP. New SSPs and intermediate products are formed by such methods.

  11. Methods of forming single source precursors, methods of forming polymeric single source precursors, and single source precursors formed by such methods

    SciTech Connect (OSTI)

    Fox, Robert V.; Rodriguez, Rene G.; Pak, Joshua J.; Sun, Chivin; Margulieux, Kelsey R.; Holland, Andrew W.

    2014-09-09

    Methods of forming single source precursors (SSPs) include forming intermediate products having the empirical formula 1/2{L.sub.2N(.mu.-X).sub.2M'X.sub.2}.sub.2, and reacting MER with the intermediate products to form SSPs of the formula L.sub.2N(.mu.-ER).sub.2M'(ER).sub.2, wherein L is a Lewis base, M is a Group IA atom, N is a Group IB atom, M' is a Group IIIB atom, each E is a Group VIB atom, each X is a Group VIIA atom or a nitrate group, and each R group is an alkyl, aryl, vinyl, (per)fluoro alkyl, (per)fluoro aryl, silane, or carbamato group. Methods of forming polymeric or copolymeric SSPs include reacting at least one of HE.sup.1R.sup.1E.sup.1H and MER with one or more substances having the empirical formula L.sub.2N(.mu.-ER).sub.2M'(ER).sub.2 or L.sub.2N(.mu.-X).sub.2M'(X).sub.2 to form a polymeric or copolymeric SSP. New SSPs and intermediate products are formed by such methods.

  12. Photon-counting optical coherence-domain reflectometry using superconducting single-

    E-Print Network [OSTI]

    Teich, Malvin C.

    Photon-counting optical coherence-domain reflectometry using superconducting single- photon reflecting samples. In particular, we experimentally demonstrate the possibility of using superconducting. Drakinsky, J. Zhang, A. Verevkin, and R. Sobolewski, "Fabrication of nanostructured superconducting single

  13. Physics of self-quenching and self-recovering Single Photon Avalanche Detectors (SPADs)

    E-Print Network [OSTI]

    You, Sifang

    2012-01-01

    J. Cheng, and Y. -H. Lo, “Physics of single photon avalancheJ. Cheng, and Y. -H. Lo, “Physics of self-recovering single72 F IGURE 4.2. D EVICE STRUCTURE FOR THE PHYSICS

  14. Modeling and simulation of stochastic phenomena in carbon nanotube-based single molecule sensors

    E-Print Network [OSTI]

    Ulissi, Zachary Ward

    2015-01-01

    Shrinking sensors to the nanoscale introduces novel selectivity mechanisms and enables the ultimate sensitivity limit, single-molecule detection. Single-walled carbon nanotubes, with a bright fluorescence signal and no ...

  15. Spectroscopy and external control of optical dynamics in single semiconductor nanocrystals

    E-Print Network [OSTI]

    Shimizu, Kentaro, 1975-

    2002-01-01

    Single molecule spectroscopy has progressed substantially in the past ten years and the accompanying progress in the optical study of single semiconductor nanocrystals has opened a new dimension in our understanding of the ...

  16. Single line-of-sight dual energy backlighter for mix width experiments...

    Office of Scientific and Technical Information (OSTI)

    Single line-of-sight dual energy backlighter for mix width experiments Citation Details In-Document Search Title: Single line-of-sight dual energy backlighter for mix width...

  17. Numerical analysis of thermal-hydrological conditions in the single heater test at Yucca Mountain

    E-Print Network [OSTI]

    Birkholzer, Jens T.; Tsang, Yvonne W.

    1998-01-01

    Single Heater Test at Yucca Mountain, LBNL-39789, E.O. Law­Single Heater Test at Yucca Mountain Jens T. Birkholzer andwaste repository at Yucca Mountain. The heating phase of the

  18. A distribution-based method to resolve single-molecule Förster resonance energy transfer observations

    E-Print Network [OSTI]

    Backovi?, Mihailo; Price, E. Shane; Johnson, Carey K.; Ralston, John P.

    2011-04-12

    We introduce a new approach to analyze single-molecule Förster resonance energy transfer (FRET) data. The method recognizes that FRET efficiencies assumed by traditional ensemble methods are unobservable for single molecules. ...

  19. Superconducting nanowire single-photon detectors : new detector architectures and integration with photonic chips

    E-Print Network [OSTI]

    Najafi, Faraz

    2015-01-01

    Superconducting nanowire single-photon detectors (SNSPDs) are a promising technology for long-distance optical communication and quantum information processing. Recent advances in single-photon generation, storage and ...

  20. Investigation of single-substance horizontal two-phase flow

    SciTech Connect (OSTI)

    Dickinson, D.A.; Maeder, P.F.

    1984-03-01

    Despite the abundance of work in the field of two-phase flow, it seems as though a consensus has not been reached on some of the fundamental points. Although exceptions exist, adequate physical interpretation of the flow seems to be hindered either by complexity of analysis or, in the opposite extreme, the trend toward limited-range analysis and correlations. The dissertation presents the derivation of basic conservation equations for the phases. The combined equations are used to examine the phenomenon of slip and its practical limitations, the Fanno line for single-substance flow and the effect of slip on choking. Equations for critical mass flux in the presence of slip are derived. The Mach, Reynolds and Froude numbers based on conditions at flashing are introduced as the characteristic parameters, and the importance of compressibility in single-substance two-phase flow is discussed. Experimental measurements of pressure change and void fraction for flow in the highly compressible range (.5 < Ma < 1) are presented. The working fluid is Refrigerant R-114, at room temperature, in a test section of diameter 5 cm and length 8 m. The effect of the Froude and Mach numbers is examined. The experimental facility is operated intermittently with running times of approximately two minutes and is instrumented for rapid measurements using a computer data acquisition and control system. A description of the facility and procedure is provided.