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3.237 Aktuelle Fachpublikationen zum Thema temperature

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Three-step growth of metamorphic GaAs on Si(001) by low-pressure metal organic chemical vapor deposition

13.09.2013 | Yifan Wang, Qi Wang, Zhigang Jia, Xiaoyi Li, Can Deng et al., Journal of Vacuum Science & Technology B, 2013

In this study, metamorphic growth of GaAs on Si(001) substrate was investigated via three-step growth in a low-pressure metal organic chemical vapor deposition reactor. Three-step growth was achieved by simply inserting an intermediate temperature GaAs layer between the low temperature GaAs ...

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Vacuum Ultraviolet Spectroscopy and Photochemistry of Zinc Dihydride and Related Molecules in Low-Temperature Matrices

13.09.2013 | Chris Henchy; Una Kilmartin; John G. McCaffrey, Journal of Physical Chemistry A, 2013

Optical absorption spectra of thin film samples, formed by the codeposition of zinc vapor with D2 and CH4, have been recorded with synchrotron radiation. With sufficiently low metal vapor flux, samples deposited at 4 K were found to consist exclusively of isolated zinc atoms for both solids. The ...

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Measurements of sputtered neutrals and ions and investigation of their roles on the plasma properties during rf magnetron sputtering of Zn and ZnO targets

12.09.2013 | L. Maaloul and L. Stafford, Journal of Vacuum Science & Technology B, 2013

Langmuir probe and optical absorption spectroscopy measurements were used to determine the line-integrated electron density, electron temperature, and number density of Ar atoms in metastable 3P2 and 3P0 levels in a 5 mTorr, rf magnetron sputtering plasmas used for the deposition of ZnO-based ...

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Metal–organic frameworks: a novel SERS substrate

11.09.2013 | Tsung‐Han Yu, Chin‐Hsian Ho, Cheng‐You Wu, Ching‐Hsuan Chien, Chia‐Her Lin, Szetsen Lee, Journal of Raman Spectroscopy, 2013

We report the direct observation of surface‐enhanced Raman scattering (SERS) effect using metal–organic frameworks (MOFs) as substrates. Without the aid of any metal colloids or enhancing agents, the SERS signals of methyl orange (MO) adsorbed in MOFs were observed and even remained active if ...

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Functionality of Protein‐Fortified Extrudates

10.09.2013 | Li Day, Barry G. Swanson, Comprehensive Reviews in Food Science and Food Safety, 2013

Abstract Fortification of extrusion feed formulations with proteins from selected sources will improve the health‐promoting quality of snack and breakfast foods. Molecular interactions among proteins, starch, lipids, water, and other constituents in the extrusion “melt” are the basis for ...

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Kondo effect in the Kohn–Sham conductance of multiple‐level quantum dots

10.09.2013 | Gianluca Stefanucci, Stefan Kurth, physica status solidi (b), 2013

At zero temperature, the Landauer formalism combined with static density functional theory is able to correctly reproduce the Kondo plateau in the conductance of the Anderson impurity model provided that an exchange‐correlation potential is used which correctly exhibits steps at integer ...

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Iterative path integral summation for nonequilibrium quantum transport

10.09.2013 | S. Weiss, R. Hützen, D. Becker, J. Eckel, R. Egger, M. Thorwart, physica status solidi (b), 2013

We have developed a numerically exact approach to compute real‐time path integral expressions for quantum transport problems out of equilibrium. The scheme is based on a deterministic iterative summation of the path integral (ISPI) for the generating function of nonequilibrium observables of ...

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Aqueous Solvation of Hg(OH)2: Energetic and Dynamical Density Functional Theory Studies of the Hg(OH)2–(H2O)n (n = 1–24) Structures

10.09.2013 | J. I. Amaro-Estrada; L. Maron; A. Ramírez-Solís, Journal of Physical Chemistry A, 2013

A systematic study of the hydration of Hg(OH)2 by the stepwise solvation approach is reported. The optimized structures, solvation energies, and incremental free energies of 1–24 water molecules interacting with the solute have been computed at the B3PW91 level using 6-31G(d,p) basis sets for the ...

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Perspective on Engineering Transition-Metal Oxides

09.09.2013 | John B. Goodenough, Chemistry of Materials, 2013

Engineering transition-metal oxides depends on understanding a few general concepts. Three of these are discussed: (1) orbital mixing and the roles of cation-d/O-2p covalent bonding as distinct from on-site cation–orbital hybridization; (2) cooperativity in ordering (a) localized orbitals to ...

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Modulation of critical current density in polycrystalline boron‐doped diamond by surface modification

06.09.2013 | Keisuke Natsui, Takashi Yamamoto, Takeshi Watanabe, Yoichi Kamihara, Yasuaki Einaga, physica status solidi (b), 2013

In the article by Keisuke Natsui et al. (pp. 1943–1949), modulation of a critical current density in heavily boron‐doped diamonds is demonstrated by changing the surface termination without introducing any impurity. The critical current density values could be modulated in a reversible manner ...

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