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  • 1
    Electronic Resource
    Electronic Resource
    Molecular dynamics evaluation of self-diffusion in Yukawa systems (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4506-4514 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Self-diffusion coefficients of Yukawa systems in the fluid phase are obtained from molecular dynamics simulations in a wide range of the thermodynamical parameters. The Yukawa system is a collection of particles interacting through Yukawa (i.e., screened Coulomb) potentials, which may serve as a model for charged dust particles in a plasma or colloidal particles in electrolytes. The self-diffusion coefficients are found to follow a simple scaling law with respect to the system temperature, which is consistent with the universal scaling (i.e., temperature scaling independent of the ratio of interparticle distance to screening length) observed by Robbins et al. [J. Chem. Phys. 88, 3286 (1988)] if the fluid system is near solidification. Also discussed is the velocity autocorrelation function, which is in part used to determine the self-diffusion coefficients through the Green–Kubo formula.© 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1316084
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  • 2
    Electronic Resource
    Electronic Resource
    Raman scattering of interface modes in ZnTe–CdSe superlattices (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5946-5950 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Raman spectra have been measured for ZnTe/CdSe superlattices grown by hot wall epitaxy. A mechanical vibrational interface phonon (MVIF) mode localized at the Zn–Se interface is distinctly observed in addition to quasiconfined longitudinal optic (LO) modes. The relative intensity of the MVIF mode is increased as the period of the superlattice becomes short. Raman spectral profiles calculated by use of a linear chain model and a bond polarizability model explain this behavior qualitatively. The quasiconfined LO modes show resonant enhancement for excitations at the band gap energies of ZnTe and CdSe. The effect of atomic diffusion on the interfacial structure has been examined in thermally annealed superlattices by Raman measurement. It is shown that Raman scattering of the interface mode provides information about the interdiffusion of atoms and the sharpness of the heterointerfaces. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363566
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  • 3
    Electronic Resource
    Electronic Resource
    Fundamental properties in the formation of Co, Ni, and Pt metal thin films using pulsed laser deposition (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3572-3577 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co, Ni, and Pt metal thin films have been formed using the pulsed laser deposition method. Several fundamental properties of this method, e.g., deposition rate for the KrF excimer laser with various irradiation energy densities, distribution of film thickness, change of the deposition rate as a function of the number of shots, change of the target morphology, and corresponding film structure, are examined. It is found that the deposition rate and the film structure (amorphous and/or polycrystalline) depend on the state of the morphology of the target. An attempt to control the target morphology was performed, i.e., the rotation of the Co target restrained the target surface from the formation of laser cones and as a result, the amorphous Co films could be obtained. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361409
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  • 4
    Electronic Resource
    Electronic Resource
    High power and high-temperature operation of GaInP/AlGaInP strained multiple quantum well lasers (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1173-1175 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High power and high-temperature operation of transverse-mode stabilized 690 nm AlGaInP strained multiple quantum well lasers is described. Three 0.5% biaxially compressive strained GaInP (8 nm) wells were employed in the active region. Low threshold current of 36 mA and very high output power of 60 mW at high temperature up to 100 °C were obtained with 700 μm long lasers, whose facets were coated with antireflection–reflection films. This is, to the best of our knowledge, the first report that an AlGaInP laser has reached a cw output power of 60 mW at a high temperature of 100 °C. Very low degradation rate at 50 °C with 35 mW output power was confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108776
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  • 5
    Electronic Resource
    Electronic Resource
    Nanocolumns composed of GaAs-InAs jointed whiskers and SiO2 covers (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1157-1158 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A dense array of nanocolumns composed of GaAs-InAs jointed whiskers and SiO2 covers has been fabricated on InAs substrates. The cylindrical GaAs whisker with a 20 nm diameter and 1.5 μm long is jointed on top of 0.3-μm-long InAs whisker by vapor-liquid-solid epitaxy. The nanocolumns array exhibited photoluminescence at 14 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113010
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  • 6
    Electronic Resource
    Electronic Resource
    Pulsed laser deposition system for producing oxide thin films at high temperature (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 3340-3343 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A pulsed laser deposition system capable of raising substrate temperatures up to 1500 °C in oxygen atmosphere has been developed to grow oxide thin films with excellent crystalline quality. The high temperature is achieved by condensation onto a substrate of infrared light emitted from a halogen lamp through a SiO2 rod serving as an optical guide. Deposition temperatures are regulated ranging from 1500 to 150 °C, under a partial oxygen pressure from 100 to 5×10−6 Pa. An appropriate thermal insulation between the substrate holder and the surrounding components suppresses the heat flow inbetween, leading to a smooth rotation of the substrate holder and preventing the mechanical components from being oxidized. A high-precision five-axis alignment mechanism equipped with a substrate manipulator allows for the development of an application in coaxial impact-collision ion scattering spectroscopy. As a demonstrative experiment, highly oriented Ga2O3 films, which are useful as deep ultraviolet transparent semiconductors, have been deposited on an Al2O3 (0001) single crystal substrate at 1000 °C under an oxygen pressure of 5×10−5 Pa. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1384449
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  • 7
    Electronic Resource
    Electronic Resource
    Classical interatomic potentials for Si–O–F and Si–O–Cl systems (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 6679-6690 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Stillinger–Weber (SW)-type potential sets have been developed for Si–O–F and Si–O–Cl systems based on interatomic potential energy data obtained from ab initio quantum-mechanical calculations. We have constructed the new potential sets in such a way that the obtained potentials are supersets of existing well-known SW-type potentials for Si, SiO2, and Si-halogen systems. Our aim of the potential development is to perform molecular dynamics (MD) simulations for both silicon and silicon dioxide etching by F or Cl on the same footing. Presented in this article are details of the potential derivation and some sample MD simulation results. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1400789
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of bicarbonate ions and pH on acquisition and maintenance of potential for motility in ayu, Plecoglossus altivelis Temminck et Schlegel (Osmeridae), spermatozoa (2001)
    Oxford, UK : Blackwell Science Ltd
    Aquaculture research 32 (2001), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The effects of extracellular ions on the acquisition and maintenance of the potential for motility in the spermatozoa of the ayu, Plecoglossus altivelis Temminck et Schlegel (Osmeridae), were examined. Testicular spermatozoa and milt spermatozoa were obtained from fully matured males and diluted with buffered solution (BS, 20 mM HEPES–NaOH, pH 7.5). Testicular spermatozoa showed a significantly low rate of motility (0.8 ± 0.4%), whereas milt spermatozoa showed a high rate (89.4 ± 2.1%). The spermatozoa were incubated with various isotonic media for 2 h, diluted with BS, and changes in the rates of motility were then compared. When incubated for 2 h with artificial seminal plasma (ASP), corresponding in terms of ionic constituents to seminal plasma buffered at pH 8.0, both spermatozoa showed a high rate of motility. Testicular spermatozoa acquired and milt spermatozoa maintained the potential for motility in response to the HCO3– ion concentrations (between 0 and 20 mM) in the ASP. The differences in the pH of the ASP had a significant effect on the acquisition and maintenance of the potential for motility, and spermatozoa showed the highest rate of motility with the ASP at pH 8.0 and 8.5. These results suggest that the quality of milt in the ayu can be regulated by controlling the concentration of bicarbonate and the pH of the incubating media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2109.2001.00571.x
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  • 9
    Electronic Resource
    Electronic Resource
    Cryopreservation of the sperm of the Japanese bitterling (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 58 (2001), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Sperm of the Japanese bitterling Tanakia limbata that had been cryopreserved with 5 or 10% methanol plus 95 or 90% foetal bovine serum (FBS) showed higher percentage and longer duration of motility than those that had been cryopreserved with 90% FBS and 10% DMSO, glycerol, N,N-dimethylacetamide or N, N-dimethylformamide. Foetal bovine serum, used as extender, had some cryoprotective effects when spermatozoa were cooled either with 10% methanol or without methanol. Spermatozoa, cooled to −40° C and then immersed in liquid nitrogen, had greater post-thaw motility than those cooled to −20, −60, or −80° C. The post-thaw percentage of motile spermatozoa increased significantly (P 〈 0·001) with decreases in the freezing rate from 60 to 5°C min−1. These results indicate that 10% methanol plus 90% foetal bovine serum is a suitable diluent for cryopreservation of bitterling spermatozoa and that samples should be cooled to -40°C at a low freezing rate for effective storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2001.tb00521.x
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  • 10
    Electronic Resource
    Electronic Resource
    BARORECEPTORS IN THE CAROTID SINUS CONTRIBUTE TO ARTERIAL BARORECEPTOR REFLEXES IN NORMOTENSIVE RATS (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 22 (1995), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. Baroreceptor reflex influences on renal sympathetic nerve activity (RSNA) were estimated with non-linear regression analysis (sigmoidal curve fitting) before and after transection of carotid sinus nerves (CSN) and aortic depressor nerves (ADN) in rats.2. Transection of ADN reduced the gain of the reflex to 42% of basal levels with increases in arterial pressure (MAP) and RSNA. Subsequent transection of CSN eliminated the remaining sigmoidal correlation between MAP and RSNA without further changes in resting MAP and RSNA.3. By comparison, the transection of CSN reduced the gain of the reflex to 53% of basal levels without affecting other variables. Additional transection of both ADN eliminated the remaining sigmoidal correlation between MAP and RSNA with further increases in resting MAP and RSNA.4. These results indicate that carotid sinus baroreceptors exist in rats. They contribute to baroreceptor-mediated reflex changes in RSNA as do aortic baroreceptors, although the working range of MAP may increase with transection of the latter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1995.tb02971.x
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