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  • 1
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary X-ray diffraction studies of haemorrhagin I from the snake venom of Agkistrodon acutus (1996)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 201-202 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Haemorrhagin I from the snake venom of Agkistrodon acutus (AaHI) has been crystallized using the hanging-drop vapour diffusion method. The crystals belong to space group P41212 or P43212 with unit-cell dimensions a = b = 63.61 and c = 95.69 Å. There is one molecule in the asymmetric unit. Data to 2.35 Å resolution have been collected using a single-crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444995009115
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  • 2
    Electronic Resource
    Electronic Resource
    Extraction of Molecular Edges on the Average Difference Map by a Monte-Carlo Method (1996)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 909-915 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A method giving a low-resolution image of the molecules in the unit cell has been described, which was based only on the observed structure factors. An operator, called the average difference operator (ADO), was introduced in reciprocal space to flatten the electron densities everywhere but the regions on either side of the molecular envelope in real space. The observed structure factors were first modified by ADO, then a Monte-Carlo condensing protocol [Subbiah (1991). Science, 252, 128–133; (1993). Acta Cryst. D49, 108–119] was employed to stimulate the modified electron-density map at low resolution. It was found that molecular edges could be extracted, especially when there was relatively large solvent content in the unit cell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444996000443
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  • 3
    Electronic Resource
    Electronic Resource
    Purification, crystallization and preliminary X-ray diffraction analysis of haemorrhagin IV from the snake venom of Agkistrodon acutus (1996)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 407-408 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Haemorrhagin IV, a medium molecular weight haemorrhagin from the snake venom of Agkistrodon acutus (AaHIV), has been purified and crystallized. The molecular weight and isoelectric point of AaHIV are 44 kDa and pI 5.0, respectively. The crystal belongs to space group C2221 with unit-cell dimensions of a = 124.2, b = 114.5, c = 98.4 Å, and could o diffract X-rays to 3.0 Å, resolution. There are one or two molecules in the crystallographic asymmetric unit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444995014363
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  • 4
    Electronic Resource
    Electronic Resource
    A modular solid state detector for measuring high energy heavy ion fragmentation near the beam axis
    Amsterdam : Elsevier
    Radiation Measurements 23 (1994), S. 65-81 
    Details
    ISSN: 1350-4487
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/1350-4487(94)90025-6
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic hysteresis in melt-spun Nd-Fe-Al-B-Si alloys with high remanence (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5559-5561 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The large values of remanence observed in isotropic melt-spun R-Fe-Al-B-Si samples have been investigated by correlating the magnetic properties with the microstructure. Transmission electron microscope studies showed that the highest values of reduced remanence mR are obtained in samples with very fine Nd2Fe14B-type grains having a size of about 180 A(ring). The increased reduced remanence can be explained by the large interaction among the magnetic moments of neighboring grains which is caused by the large surface-to-volume ratio of the fine grains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342307
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  • 6
    Electronic Resource
    Electronic Resource
    Size effects on the magnetic properties of fine Fe-Cr particles (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6973-6973 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic and structural properties of Fe100−xCrx ultrafine particles with x=5–20 have been studied as a function of particle size. Particles with sizes in the range of 100–450 A(ring) were prepared by gas evaporation under Ar atmosphere. The particles had a high coercivity with the smaller particles showing a stronger temperature dependence of coercivity than the larger particles. In the smaller x=5 particles the coercivity was about 2500 Oe at 10 K and 100 Oe at room temperature. The temperature coefficient of coercivity of Fe-Cr fine particles was smaller than that of Fe particles.1 Mössbauer spectroscopy was used in the temperature range of 4.2–300 K to better understand the magnetic hysteresis behavior of the particles. The spectra showed the presence of Fe-Cr, α-Fe, and Fe-oxide components in the larger particles, and Fe-Cr and Fe oxide in the smaller particles. The coercivity at low temperature is increased with decreasing particle size and this is attributed to the higher percentage of Fe oxide in the smaller particles. The magnetic and structural properties of protected Fe-Cr particles sandwiched between two Ag films are being studied in an attempt to understand the effect of surface Fe oxide on the magnetic hysteresis behavior of the whole particle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352401
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  • 7
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of NdFe12−xMoxN1−δ compounds : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6251-6253 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of nitrides NdFe12−xMoxNi1−δ with x=1–2.5 and δ≤0.2 have been investigated. All nitrides are of the ThMn12 tetragonal structure with the unit cell volumes about 3% larger than their parent alloys. Curie temperatures are enhanced by nitrogenation about 160 K and increase linearly with decreasing content x of Mo. NdFe12−xMox exhibits a weak uniaxial anisotropy with a value of BA less than 0.6 T when x≥1.75. After nitrogenation, all nitrides have a strong uniaxial anisotropy. Values of the anisotropy field BA increase monotonically from 6.35 T for x=2.5 up to 9.5 T for x=1 as decreasing content x of Mo. Saturation magnetizations also increase monotonically with decreasing content x.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352661
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic properties of Sm2Fe14−xCoxSi2-based quasiternary compounds : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6156-6158 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural and magnetic properties of the off-stoichiometric R2Fe17-type Sm2Fe14−xCoxSi2 compounds with 0≤x≤7 have been investigated by x-ray diffraction, thermomagnetic analysis, and magnetic measurements. Substitution of Co for Fe leads to an increase in Curie temperature, ΔTc=303 K for samples with x from 0 to 7. The saturation magnetization Ms increased with increasing Co content at first and then decreased. A maximum saturation magnetization Ms=124 emu/g was obtained at x about 4. The anisotropy changes from planar x〈4 to uniaxial x≥4 with Ha=23 kOe for x=7. Introduction of N leads to an increase in lattice constants causing a further enhancement in the Curie temperature and anisotropy field. The best properties were obtained for the Sm2Fe10Co4Si2N2.3 compound with Tc=742 K, Ha (300 K)=175 kOe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358339
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  • 9
    Electronic Resource
    Electronic Resource
    The effect of particle size and consolidating pressure on the magnetic properties of Sm(Co, Fe, Cu, Zr)z bonded magnets : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 6712-6714 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of particle size on the Br, BHmax, and specific density of Sm(Co0.62Fe0.29Cu0.07Zr0.02)8.0 and Sm(Co0.70Fe0.21Cu0.07Zr0.02)8.0 bonded magnets has been systematically investigated. It was found that magnets made of powders with a top size less than 53 μm have a low specific density and, hence, low Br and BHmax values. Magnets made of powders of about 250 μm top size, with a composition of Sm(Co0.62Fe0.29Cu0.07Zr0.02)8.0, yield a specific density of 7.0 gm/cc (84% of theoretical density), a Br of more than 8.1 kG, and a BHmax of about 15 MGOe. A slight decrease in Br and BHmax was noticed when the particle top size was increased beyond 710 μm. This decrease in Br and BHmax may be attributed to the imperfect grain alignment arising from the fact that each particle may consist of multigrain grains with a random orientation. Because of the slightly lower Fe content, magnets with a composition of Sm(Co0.70Fe0.21Cu0.07Zr0.02)8.0 exhibit slightly lower Br and BHmax values when compared to those of Sm(Co0.62Fe0.29Cu0.07Zr0.02)8.0. However, the relationships of Br and BHmax to particle size are nearly identical for both compositions. When the powder top size was fixed at about 250 μm, a consolidating pressure of 8 T/cm2 appears to be sufficient to obtain magnets with a specific density of 6.9 gm/cc and with a reasonable grain alignment. For Sm(Co0.62Fe0.29Cu0.07Zr0.02)8.0 bonded magnets, a Br of 8.5 kG, Hc of 8.5 kOe, Hci of 23.0 kOe, BHmax of 16.7 MGOe, and Hk of 8.0 kOe were obtained. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367587
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  • 10
    Electronic Resource
    Electronic Resource
    Cross-sectional transmission electron microscopy study of 1.5 MeV Kr+ irradiation-induced amorphization in α-quartz (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 4204-4208 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cross-sectional and high-resolution transmission electron microscopy (XTEM and HRTEM, respectively) have been used to characterize ion-beam-induced amorphization of α-quartz irradiated with 1.5 MeV Kr+ ions at room temperature. The accumulation of damage and the growth of the amorphous layers in quartz were studied as a function of ion fluence up to 1.7×1014 ions/cm2. An amorphous band was first observed at the peak displacement damage range, and this region increased in width with increasing ion fluence. These results demonstrate that direct displacement damage by nuclear collision is more efficient than ionization processes in inducing amorphization in quartz. At lower fluences (≤1.7×1013 ions/cm2), the damage profile observed by XTEM is in excellent agreement with the distribution of displacement damage predicted by TRIM calculations. At higher fluences, the range of the amorphous band measured by XTEM exceeds the depth predicted by TRIM. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368637
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