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  • 1
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    The effect of strain on the domain switching of ferroelectric polycrystals (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-02-18
    Description: The effect of external strain on the non-linear electromechanical behavior of a ferroelectric poly-crystal is investigated under different applied electric fields by using a phase field model. Simulation results show that the domain switching induced by electric field under a tensile strain is much easier than that under a compressive strain, which is attributed to that a multi-domain structure can be more easily formed under the tensile strain than in the case of compressive strain when the electric field is absent. It is also found that a compressive misfit strain increases the macroscopic coercive field and remnant polarization while a tensile misfit strain decreases both of them. In addition, a compressive strain decreases the non-linear dielectric constant while a tensile strain increases it.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 2
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    Effect of hydrogen storage alloy on combustion properties of ammonium perchlorate /glycidylazide polymer -based propellant (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-12-11
    Description: Hydrogen storage alloys can serve as good potential fuels for propellant design, by improving the energy and combustion properties. The influence of hydrogen storage alloy (A30) on the combustion properties of ammonium perchlorate/glycidylazide polymer (AP/GAP)-based on propellant were studied. The results showed that A30 could increase the burning rate of propellants by 29.75% and 74.78%, compared with B30 and Al. The combustion model of AP/GAP-based propellant containing different fuel was built. Firstly, A30 reduced the high decomposition temperature and promote condensed phase reaction heat of AP. Secondly, A30 deduced the burning surface temperature. Thirdly, A30 might prove the explosive heat of propellant. Therefore, A30 could greatly improve combustion properties of AP/GAP-based propellant.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 3
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    The enhancing effect of mesogen-jacketed liquid crystalline polymer PBPCS on epoxy resin (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-12-11
    Description: The mixtures of mesogen-jacketed liquid crystalline polymers (MJLCP) and epoxy resin (E-51) have been prepared in a certain proportion. The category of the MJLCP is poly{2, 5-bis[(4-butoxyphenyl) oxycarbonyl] styrenes} (PBPCS). Methyl tetrahydro phthalic anhydride (MeTHPA) is served as a curing agent, and N, N-dimethylbenzylamine plays the role of catalyst. Then, based on the curing process, the modified materials have been acquired by casting molding. The effect of PBPCS's improvement has been researched through the mechanical properties test, dynamic thermal mechanical test and scanning electron microscope (SEM). The results indicated that PBPCS could apparently improve the mechanical properties of resin E-51. Compared with unmodified materials, the elongation at break and the tensile strength of PBPCS have been improved remarkably through modification. Both mechanical properties of the 4wt% PBPCS/E-51/MeTHPA were enhanced by 48% and 153% separately, and the characteristics of ...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 4
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    A mule cloned from fetal cells by nuclear transfer (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-05-31
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Woods, Gordon L -- White, Kenneth L -- Vanderwall, Dirk K -- Li, Guang-Peng -- Aston, Kenneth I -- Bunch, Thomas D -- Meerdo, Lora N -- Pate, Barry J -- New York, N.Y. -- Science. 2003 Aug 22;301(5636):1063. Epub 2003 May 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Northwest Equine Reproduction Laboratory, Department of Animal and Veterinary Science, University of Idaho, Moscow, ID 83844, USA. gwoods@uidaho.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12775846" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/metabolism ; Cell Line ; *Cloning, Organism ; Embryo Transfer ; Embryo, Mammalian ; Embryonic and Fetal Development ; Equidae/*embryology/*genetics ; Female ; Fibroblasts ; Horses ; Male ; *Nuclear Transfer Techniques ; Oocytes/metabolism ; Pregnancy
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    Corrosion behaviors of pure copper and Cu-Ni-Zn alloy in NaCl solution and artificial salt water (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-02-03
    Description: Corrosion behaviors of pure Cu and Cu-Ni-Zn alloy were investigated in 3.5% NaCl solution and artificial seawater by electrochemical impedance spectroscopy and potentiodynamic polarization technologies, and the corrosion morphologies were observed by field emission scanning electron microscopy. The results revealed that Cu-Ni-Zn alloy possessed better corrosion resistance than that of pure Cu in both 3.5% NaCl solution and artificial seawater. The corrosion morphology displayed the corrosion product films on Cu-Ni-Zn alloy were more compact and uniform than that on the pure Cu in both 3.5% NaCl and artificial seawater media.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 6
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    Effect of GBCD on IGC susceptibility of solution treated 2024 Al alloy (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-02-03
    Description: Grain boundary character distribution (GBCD) of solution heat treated 2024 Al alloy was analyzed by electron backscattered diffraction, and intergranular corrosion (IGC) susceptibility and corrosion weight loss of the 2024 Al were investigated according to ASTM G110-92. The grain boundaries are composed of 12.17% low angle (∑1) boundaries, 10.87% low coincidence site lattice (∑3-∑29) boundaries and 76.96% random (R) boundaries. After corrosion for 6 h, the corroded boundary proportions of ∑1, ∑3, ∑5-∑29 and R boundaries were 10.71%, 11.11%, 21.95% and 25.14%, respectively. This shows that the GBCD has a great effect on IGC susceptibility of the solution treated 2024 Al, and both ∑1 and ∑3 boundaries exhibit much higher IGC resistance than ∑5-∑29 and R boundaries. Among all the boundaries, the R boundaries have the highest IGC susceptibility.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 7
    Electronic Resource
    Electronic Resource
    Discovery, isolation, structure elucidation, and biosynthesis of U-106305, a cholesteryl ester transfer protein inhibitor from UC 11136 (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 10629-10634 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00148a004
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  • 8
    Electronic Resource
    Electronic Resource
    The complex of HF2− and H2O: A theoretical study (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 5883-5890 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The complex of HF2− and H2O is studied using B3LYP, MP2, and QCISD methods. Energetics, geometries, and vibrational frequencies of the equilibrium structure and two transition states are calculated using 6-311++G(d,p), 6-311++G(2d,2p), and 6-311++G(2df,2pd) basis sets. For the equilibrium structure there is a hydrogen bond between one of the F atoms of HF2− and one of the H atoms of H2O. The two transition states are only about 0.5 kcal/mol higher. The HF2−–H2O equilibrium structure is planar and, at the B3LYP/6-311++G(2df,2pd) level, the F–H–O bond angle is nearly linear at 174.4° and the F–O distance is 2.59 Å. With zero point energy and counterpoise correction, the binding energy is 14.9 kcal/mol and the strong hydrogen bond of HF2− is weakened by 11.3 kcal/mol (25%). In HF2− the experimental F–F distance is 2.28 Å and the F–H–F bond angle is 180°. The most intense IR vibration is the F–H–F asymmetric stretch at 1331 cm−1. In HF2− the calculated F–F distance is 2.30 Å and in the HF2−–H2O equilibrium structure the F–H distance for the hydrogen bonded F atom is longer by 0.13 Å but the F–H distance for the free F atom is shorter by 0.10 Å and the F–F distance is only 0.03 Å longer. The F–H–F bond angle is very close to linear at 179.4°. The most intense IR vibration remains the F–H–F asymmetric stretch, blueshifted by 648 cm−1. The F–H–O asymmetric stretch is also an intense IR vibration, redshifted by 729 cm−1 from the O–H local mode stretch for H2O. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1398094
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  • 9
    Electronic Resource
    Electronic Resource
    Dimers of alkaline earth metal halide radicals, (MX)2 (M=Be, Mg, Ca; X=F, Cl): A theoretical study (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 1534-1538 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Alkaline earth metal halide radical dimers, (MX)2 (M=Be, Mg, Ca and X=F, Cl) have not yet been observed experimentally and their existence could be doubted since MX is known to disproportionate in the bulk. We study the (MX)2 species using DFT and MP2 methods and show that they are either thermodynamically or kinetically stable with respect to various reactions including disproportionation. Energetics, geometries, and vibrational frequencies of singlet and triplet equilibrium structures and some transition states are calculated. The ground states of (MX)2 are all singlet except (CaF)2 which is triplet and, with the possible exception of (CaF)2, the ground states have a rhombic structure in which the X atoms are shared equally with each M atom. The ionization potentials of the (MX)2 species are significantly lower than those of the corresponding MX species suggesting that their chemistry may be significantly different. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1333700
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  • 10
    Electronic Resource
    Electronic Resource
    Optical injection effects and all-optical set-reset operations in two-segment strained multiquantum-well distributed feedback bistable lasers (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3823-3826 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical injection effects and all-optical set-reset operations in two-segment strained multiquantum-well (MQW) distributed feedback (DFB) bistable lasers were experimentally investigated. The optical bistable characteristics under detuned optical injection, of strained MQW DFB bistable lasers, show the effect of the residual Fabry–Perot side modes of the DFB structures; optimizing the input wavelength and the input power is suggested for applications. The switching properties of dynamic optical set-reset operations with pulsed optical injection were reported, which appear to be related to the optical bistable characteristics under cw optical injection; however, the switching transients are found to be essential to full understanding of these switching properties. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361808
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