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  • 1
    Electronic Resource
    Electronic Resource
    Peptide synthesis catalyzed by modified .alpha.-chymotrypsin in low-water organic media (1991)
    s.l. : American Chemical Society
    The @journal of organic chemistry 56 (1991), S. 3149-3153 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00009a041
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of additive elements on magnetic properties and irreversible loss of hot-worked Nd-Fe-Co-B magnets : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6049-6051 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: There has been limited work on the effects of alloying elements on the properties of hot-worked anisotropic magnets. The coercivity mechanisms for sintered and rapidly solidified Nd-Fe-B magnets are different, and additives can have different effects on magnetic properties. The present study was conducted to clarify the effects of various alloying elements on the properties of hot-worked magnets. Ribbons of composition (Nd13.6−xRx)(Fe77.6−yTyCo2.8)B6.0 (R=Ce and Dy; T=Al, V, Cu, Ga, Zr, Nb, Mo, and Sn; x=0, 1, and 2; y=0, 0.5, and 1.0) were prepared by melt spinning. Anisotropic magnets were made at 1073 K with 55.6% reduction in height by die upsetting. Room-temperature magnetic properties and irreversible losses after exposure at 323–473 K were determined. The results showed that small amounts of Al, V, Cu, and Ga enhanced the remanence of the magnets, while Dy, Al, Ga, Zr, Nb, and Mo improved the coercivity. Dy, Ga, and Mo additions were effective in increasing the heat resistance temperature (HRT), defined as the temperature where the irreversible loss is 3%. HRT is dependent on initial intrinsic coercivity and the squareness ratio (Hk/iHc) of the demagnetization curve. An equation relating these parameters is given. An HRT of 453 K was obtained with a suitable alloy composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347766
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  • 3
    Electronic Resource
    Electronic Resource
    Hot workability of melt-spun Nd-Fe-Co-B magnets : 35TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS San Diego, California (USA) 29 Oct−1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5841-5843 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Anisotropic Nd-Fe-B magnets are produced from melt-spun ribbons by hot working technique. The processing is facilitated by improved workability. In order to obtain a sound magnet, it is important to suppress the crack initiation and growth. An investigation was carried out to study the deformation mechanism of the alloy system and to improve workability by changes in alloy composition. Alloy ribbons with composition (Nd13.6−xRx) (Fe77.6−y Ty Co2.8)B6.0 [R=Ce, Dy; T=Al, Si, V, Cu, Ga, Zr, Nb, Mo, Sn; x= 0, 1, 2; y=0, 0.5, 1.0] were prepared by melt spinning and then hot pressed into fully dense compacts. These compacts were upset in a hot working simulator. Hot workability was evaluated by measuring the crack opening displacement on the surface at the half height of the upset specimen. The relationship between strain rate and flow stress was found to be expressed by the equation: ε(overdot) = Aσn exp( − Q/RT). Values of n and Q were obtained for quarternary composition (Nd-Fe-Co-B). The effects of strain and strain rate on magnetic properties were also studied for quarternary composition. Of the additive elements, cerium and silicon addition showed significant improvement in workability without loss of coercivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347844
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  • 4
    Electronic Resource
    Electronic Resource
    Hard x-ray interaction with materials : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 493-495 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Based on the analyses of microprocesses involved in the interaction of synchrotron radiation with materials, we have developed a simulation method to calculate heat energy distribution when the synchrotron radiation goes through insert devices (filters, mirrors, or monochromators). The absorbed x-ray energy may be taken away from materials when some scattered photon and photoelectron escape from material. We have calculated the percentage of the absorbed energy taken away by the escaped photons and photoelectrons for C, Be, and Al, these elements being very important as filter materials, and for Si which is significant as a monochromator material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143803
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  • 5
    Electronic Resource
    Electronic Resource
    Metamorphism and uplift of Alpine schist in the Franz Josef–Fox Glacier area of the Southern Alps, New Zealand (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of metamorphic geology 10 (1992), S. 0 
    Details
    ISSN: 1525-1314
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Geothermometry and geobarometry of 10 garnet–oligoclase zone schists in the Franz Josef–Fox Glacier area, Southern Alps, New Zealand, give temperatures ranging from 415 to 625°C and pressures from 5.2 to 9.2 kbar, indicating a T–P array of about 50°C/kbar and inferred peak temperature conditions over a c. 15-km-thick section at depths between c. 20 and 34 km. The present-day distribution of the schist samples implies that only about one-third of the original crustal section is now exposed.The garnet–oligoclase zone schists represent the deeper part of a metamorphosed and deformed accretionary complex that was associated with late Palaeozoic–early Mesozoic subduction along the Gondwana continental margin. Partial uplift (c. 0.2 m/Ma) and erosion of the complex during Jurassic–Cretaceous times (Rangitata uplift) was synchronous with D2 deformation and recrystallization, as recorded by the P–T array. Cenozoic (Kaikoura) uplift and exhumation of the schist since c. 30 Ma to form the Southern Alps was associated with oblique-slip movement on the Alpine Fault. The present-day position and steep eastward dip of isograds and D2 structures suggest considerable clockwise rotation during uplift associated with ductile attenuation and tectonic thinning by over two-thirds of the original schist sequence, largely due to simple shear along schistosity planes. As the schist generally shows only incipient greenschist facies retrograde recrystallization, an apparently complete (although contracted) prograde mineral sequence has been preserved by rapid uplift (〉5 km/Ma) of hot rock and the effects of limited shear heating near the Alpine Fault.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1525-1314.1992.tb00077.x
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  • 6
    Electronic Resource
    Electronic Resource
    Optical properties of GaP/AlP short-period superlattices grown by gas source molecular beam epitaxy (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 81-83 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical properties of (GaP)m/(AlP)n superlattices (SLs), with m+n=14, grown on GaP(001) by gas source molecular beam epitaxy have been studied by photoluminescence (PL), electroreflectance (ER), and optical reflectance. The dependence of the PL peak energies and the relative intensity on the monolayer number of AlP is in agreement with those theoretically predicted for the case of type II band alignment of GaP/AlP SLs. The refractive index of GaP/AlP SLs has been studied for the first time and compared with that of an AlGaP alloy. The refractive index calculated for an AlGaP alloy using a single-effective-oscillator model is consistent with the experimentally obtained results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108779
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  • 7
    Electronic Resource
    Electronic Resource
    New molecular design approach for noncentrosymmetric crystal structures: Lambda (Λ)-shaped molecules for frequency doubling (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 935-937 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Second-order optical nonlinearity exists in a noncentrosymmetric crystal. We investigated a new molecular concept for noncentrosymmetric crystal structure. The Λ-shaped molecules have been found to easily form noncentrosymmetric crystals by stacking along one direction. The configuration of Λ-shaped molecules is close to an optimum condition for crystal phase-matched nonlinearity. We demonstrate that methanediamine derivatives forming Λ-shaped conformation are promising as efficient χ(2) materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106466
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  • 8
    Electronic Resource
    Electronic Resource
    Optical differentiator based on rapid collapse of Wannier–Stark localization due to space charge field screening (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2913-2915 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An optical differentiator operation is demonstrated using a GaAs/AlAs short-period superlattice near an optical absorption band edge. This operation is clearly explained by a rapid collapse of Wannier–Stark localization due to electric field screening by photogenerated space charges, because the screening causes a positive feedback loop between restoration of blueshifted wavelength of absorption band edge to the red side and an increase in optical absorption which causes an additional field screening. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112528
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  • 9
    Electronic Resource
    Electronic Resource
    .LAMBDA.-Type Main-Chain Polymers for Second Harmonic Generation (1994)
    s.l. : American Chemical Society
    Chemistry of materials 6 (1994), S. 1961-1966 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00047a012
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  • 10
    Electronic Resource
    Electronic Resource
    Translational and radial motions of a bubble in an acoustic standing wave field (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 2682-2688 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dynamic responses of a spherical bubble in an acoustic standing wave field are studied numerically. The equations of motion in the translational and the radial directions are solved simultaneously. It is shown that a bubble which is larger than the resonance size moves to a node of the pressure field and its radial oscillations become small. A sufficiently small bubble is shown to move to an antinode and radially oscillates under the maximum pressure amplitude. It is found using Poincaré maps and power spectra that a bubble which is slightly smaller than the resonance size oscillates chaotically in both the radial and the translational directions. It is demonstrated that the range of the equilibrium bubble size which shows chaotic motions broadens with the pressure amplitude. Finally, the radial responses of the bubble are shown to be dependent not only on the pressure amplitude but also on the drag force in the translational direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858731
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