Materials Literature
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The low velocity impact test on a co-curing composite wing box was presented. Three types of impact site were concerned. The indentation and contact force were obtained. A nonlinear spring-mass model embedded in closed model of bending stiffness degradation due to the onset of delamination is employed to simulate the…
In June 2011, the President announced a national manufacturing initiative. The goals of this initiative are to bring industry, universities, and the federal government together to develop a dynamic domestic advanced manufacturing sector. [1] He called this the Advanced Manufacturing Partnership, with the objective of…
The present study focuses on the stress analysis of nanocomposites in order to obtain the displacement and stress fields of a nanocomposite structure under uniaxial tension while accounting for the time-dependent behavior of the interface between the nanotube and the epoxy matrix. The effective properties of the CNTs…
考察了自制1.5 kW质子交换膜燃料电池(PEMFC)电堆在动态工况下的性能。研究了PEMFC电堆电压、功率、反应参数随车载工况运行出现的响应情况。发现在大电流密度下,由于各单电池的差异,电堆电压和功率出现比较明显的波动现象。在选定两个工况周期中,电堆各单电池电压的差异系数 C V 最大达到4.23%,最高单电池电压和最低单电池电压相差0.106 V。数据分析表明在该动态工况下,PEMFC电堆的动态响应特性受到反应物和电堆温度变化、空气局部流量过大或不足以及电堆内部阳极和阴极出现明显压降等因素的影响。该研究不仅为后续耐久性测试提供分析依据,还对PEMFC电堆实际车载运行参数与控制策略的优化具有指导意义。
The title compound [Mn(bpp)2(C4O4)]·H2O (1) was obtained by reaction of acetylenedicarboxylic acid, fresh MnCO3 and 1,3-bis(4-pyridyl)propane (bpp) in aqueous ethanol solution under 80°C. The Mn ions are bridged by acetylenedicarboxylate into a 1D zigzag chain, which is interlinked by bpp ligand to generate a 3D six-c…
Here we discuss the electronic and vibronic problems of mixed valency (MV) in molecular clusters which are of current interest in areas as diverse as solid-state chemistry, biochemistry, and molecular magnetism. Modern research in these areas is focused on the nanosized clusters at the border between classical and qua…
Abstract C27H17BrO, triclinic, P1̅ (no. 2), a = 9.269(4) Å, b = 9.734(5) Å, c = 11.437(5) Å, α = 105.816(5)°, β = 95.281(6)°, γ = 99.909(5)°, V = 967.5 Å3, Z = 2, Rgt(F) = 0.0349, wRref(F2) = 0.0834, T = 296 K.
A stepwise steam assisted crystallisation (SAC) method was developed for directly growing a highly b-oriented titanium silicalite (TS-1) film on silicon wafer. The influences of crystallisation methods and the volume ratios of water on TS-1 films were investigated. The XRD patterns showed that the highly b-oriented TS…
We investigated the electronic states and structural properties of Li x Mn[Fe(CN) 6 ] 0.83 ·3.5H 2 O, and Li x Mn[Fe(CN) 6 ] 0.87 ·2.6H 2 O, which have different amount of [Fe(CN) 6 ] vacancies. X-ray absorption spectra near the Fe and Mn K-edges revealed that the Li intercalation/deintercalation process is two-electr…
Recently, magnetism of Mn complexes has attracted much attention in relation to the metalloenzymes, in which Mn ions play important roles in the catalytic abilities. The magnetism of them are determined by structures of the Mn complexes part of the enzymes. In particular, the ferromagnetic and antiferromagnetic intera…
Origin of the right coronary artery from the pulmonary artery (ARCAPA) is a rare lesion occasionally found at angiography or autopsy. We describe a case of anomalous origin of right coronary artery from pulmonary artery with ostial stenosis initially diagnosed as coronary arteriovenous fistula from pulmonary artery. T…
Polyaniline (PANI) has been synthesised using a combined ultrasonic interfacial polymerisation method. Both the morphological structure and chemical compositions were analysed using field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and Fourier transmission infrared radiation (FTIR). Results…
Computer simulation has been employed in this paper to study the different inhibition phenomenon of two organic acids on Cu (0 0 1) surface. The computed results are in good agreement with the experimental values, which indicates that the results obtained by us are acceptable. The chemical interaction between mental s…
Five characteristic temperatures of T M = 148 K, T N = 142 K, T t = 138 K, T f ~ 125 K and T g ~ 50 K were found by the measurements of the magnetization curves at various temperature. The spontaneous magnetization appears below T M . It increases up to M s ≃ 2 × 10 −4 μ B at T t and then decreases steeply below T t ,…
Some pulp mills expect to produce viscose fiber by means of pre-existing pulp production lines as used for conventional kraft pulp having a relatively high content of hemicellulose. In the present study oxygen-reinforced alkali extraction was used to dissolve the oxidized lignin, which increased the content of alpha c…
A magnetic and pH targeting drug delivery system based on the magnetic nanocomposite doping mesoporous silica material has been successfully prepared. The material exhibited highly ordered mesostructure, large Brunauer–Emmett–Teller surface area, high pore volume, regular nanoparticle morphology and superior magnetic…
In the first-principle study on the magnetic interactions in transition metal dimer complexes, we have shown that the effective Hamiltonian method can be effectively utilized ( J. Phys.: Condens. Matter 23 375502). To extend our method to clusters with higher nuclearity, some approximations are needed since the number…
We report the stabilization of ferrofluid in oleic acid synthesized by ultrasonication of nanosized Fe3O4 particle and grafts of poly-dimethylsiloxane (PDMS) with acrylic acid and methacrylic acid. The nanosized polymers were prepared by microwave-assisted copolymerizaion of PDMS chain with 0.029 mol of acrylic acid a…
During their lifetime, glass panels are repetitively exposed to thermal stresses. These thermal stresses result from temperature differences within the panel, which most notably cause the edges of the panels to be stressed in tension. When these thermal stresses exceed the glass edge strength, failure will occur. In t…
We have investigated the electronic structure of Cu ions in ferromagnetic compound CaCu 3 Sn 4 O 12 by using X-ray absorption and magnetic circular dichroism (MCD) measurements around the Cu L 3,2 - and O K -edges. In both edges, the signal of MCD were clearly observed. By using sum rules, we could obtained M spin = 0…