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  • 1
    Electronic Resource
    Electronic Resource
    Temperature dependence of the current-voltage characteristics of metal-semiconductor field-effect transistors in n-type β-SiC grown via chemical vapor deposition (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 442-444 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Metal-semiconductor field-effect transistors (MESFET's) have been fabricated in an unintentionally doped, n-type β-SiC thin film grown by chemical vapor deposition (CVD). This n-type layer was deposited on a monocrystalline p-type β-SiC (100) CVD layer previously grown on a p-type Si (100) substrate. The buried p layer allowed the devices to be fabricated several microns away from the SiC/Si interface region which contained numerous defects formed as a result of the poor lattice match and different coefficients of thermal expansion between SiC and Si. Thermally evaporated Au was utilized for the gate contact. Sputtered TaSi2 was employed for the source and drain contacts. The gate lengths and channel depths of these MESFET's were 3.5 and 0.60 μm, respectively. Saturation of the drain currents was achieved at room temperature. Furthermore, the current-voltage characteristics, measured from 298 to 623 K for the first time, indicated that these MESFET's performed reasonably well throughout this temperature range. The maximum transconductance obtained was 1.6 mS/mm; the value of this parameter decreased with temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98416
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  • 2
    Electronic Resource
    Electronic Resource
    Chemical vapor deposition and characterization of 6H-SiC thin films on off-axis 6H-SiC substrates (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 2672-2679 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-quality, monocrystalline 6H-SiC thin films have been epitaxially grown on 6H-SiC {0001} substrates which were prepared 3° off-axis from 〈0001〉 towards 〈112¯0〉 at 1773 K via chemical vapor deposition (CVD). Essentially, no defects were generated from the epilayer/substrate interface as determined by cross-sectional transmission electron microscopy (XTEM). Double positioning boundaries which were observed in β-SiC grown on 6H-SiC substrates were eliminated as confirmed by plan-view TEM. A strong dependence of the surface morphology of the as-grown thin films on the tilting orientation of the substrates was observed and reasons for this phenomenon are discussed. The unintentionally doped 6H-SiC thin films always exhibit n-type conduction with a carrier concentration on the order of 1016 cm−3. Au-6H-SiC Schottky barrier diodes were fabricated on the CVD 6H-SiC thin films and it was found that the leakage current at a reverse bias of 55 V was only 3.2×10−5 A/cm2. This is compared to SiC films grown on other substrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341608
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  • 3
    Electronic Resource
    Electronic Resource
    An examination of double positioning boundaries and interface misfit in beta-SiC films on alpha-SiC substrates (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 2645-2650 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Beta-SiC thin films epitaxially grown on 6H-SiC (0001) substrates were examined via scanning-reflection x-ray topography (XRT) and x-ray rocking curve analysis. The lattice misfit between the (111) plane of the β-SiC epitaxial layer and the (0001) plane of the 6H-SiC substrate was determined to be 7.6×10−4. Boundaries separating regions of the β-SiC film rotated from each other by 60° were observed and identified by XRT as double positioning boundaries (DPBs), which are a special type of twin boundary. The XRT maps showed that the mosaic structure examined via optical microscopy was also caused by the DPBs. Finally, many stacking faults were generated at the boundaries as revealed by plan-view transmission electron microscopy, indicating the high internal energy of these DPBs. The formation mechanisms of the DPBs is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341004
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  • 4
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    METAPHYSICS, MSRP AND ECONOMICS (1988)
    Oxford : Periodicals Archive Online (PAO)
    The British journal for the philosophy of science. 39 (1988) 313 
    Details
    ISSN: 0007-0882
    Topics: Natural Sciences in General , Philosophy
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4064-1988-039-00-000016
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  • 5
    Electronic Resource
    Electronic Resource
    Melatonin Does Not Affect In Vitro Secretion of Testosterone in White-Footed Mouse Testis (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of pineal research 5 (1988), S. 0 
    Details
    ISSN: 1600-079X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: There is evidence that melatonin may exert its antigonadal effect by acting in the gonad to inhibit steroidogenesis. To explore this possibility a hormonally sensitive in vitro system of dispersed Peromyscus leucopus testis was used to assess the effects of melatonin on human chorionic gonadotropin (hCG)- and dibutyryl-cAMP (dbcAMP)- stimulated secretion of testosterone (T). At near-maximally stimulating doses of hCG and dbcAMP, melatonin in concentrations of 2 × 10−12 M to 2 × 10−7 M did not affect the rate of secretion of T in cells from active or regressed testes. These results do not support the idea that melatonin helps to regulate seasonal reproduction by acting in the testes to inhibit steroidogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-079X.1988.tb00794.x
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  • 6
    Electronic Resource
    Electronic Resource
    Immunoreactive luteinizing hormone-containing neurons in the brain of the white-footed mouse,Peromyscus leucopus (1987)
    Springer
    Cellular and molecular life sciences 43 (1987), S. 188-190 
    Details
    ISSN: 1420-9071
    Keywords: Luteinizing hormone ; immunocytochemistry ; brain ; white-footed mouse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The distribution of immunoreactive LH in the brain of the white-footed mouse (Peromyscus leucopus) was determined using immunocytochemical procedures. Immunoreactive fibers are located in the hypothalamus, preoptic area, septum and amygdala. Stained cell bodies are seen in the arcuate nucleus and preoptic area. Gonadectomy enhances staining for LH in the brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01942846
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  • 7
    Electronic Resource
    Electronic Resource
    Spectroscopic determination of copolymer composition in high isocyanate content polymersPresented, in part, at the ACS National Meeting, April, 1986; New York, New York; Proc. Am. Chem. Soc. Div. PMSE, 54, 690. (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 1909-1923 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Copolymer compositions high in aliphatic isocyanate content cannot be determined by typical titration methods due to crosslinking during polymer workup. A quantitative method involving ultraviolet analysis of an isocyanate/absorbing amine adduct is presented. Agreement between the ultraviolet (UV) method and elemental analysis, in both composition data and reactivity ratios (r1r2, which are calculated from data obtained by the UV method) delineate a viable method of polymer analysis. Data from Fourier transform infrared (FTIR) analysis of the urea linkage is in good agreement with nitrogen analysis and the UV method, but is sufficiently biased to cause significant differences in r1r2 values. Bias in the infrared analysis may arise from the intra- or intermolecular interaction of C=O and N—H groups of the urea linkage. Hypochromic effects are observed in UV analysis in noncarbonylic solvents. Hypochromicity varied with copolymer composition and could be related to sequence distributions. The hypochromic effects observed were most pronounced in low amine adduct content polymers where the majority of phenyl chromophores are isolated between MMA units.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070360815
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  • 8
    Electronic Resource
    Electronic Resource
    The introduction of hydroxyl functionality into polymers: The synthesis, polymerization, and hydrolysis of vinylbenzyl acetate (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 343-353 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vinylbenzyl acetate was synthesized in yields greater than 80% via the reaction of vinylbenzyl chloride with potassium acetate. Radical copolymerization of the monomer with styrene and methylmethacrylate were studied at 60°C. Reactivity ratios determined from FT-IR analysis of low conversion copolymerizations with styrene (M1) were r1 = 0.78 ± 0.07 and r2 = 1.33 ± 0.13. Polymers and copolymers of vinylbenzyl acetate were found to completely hydrolyze in dioxane/water/base solution to yield hydroxymethyl functionality. Size exclusion chromatography studies indicated that the hydrolysis proceeded without crosslinking. This procedure is a useful method for the introduction of hydroxyl functionality on polymers and avoids crosslinking problems common in previously reported methods.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1988.080260201
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