Search

We employed a novel technique combining wire and powder co-delivery to fabricate a functionally gradient material (FGM) structure consisting of Al-based composites reinforced with alternating TiC and B4C particles. The TiC content increases from the bottom up and then decreases, while the B4C content gradually increases, resulting in a continuous gradient structure. Correspondingly, the grain size of the Al matrix also changes with the variation of ceramic particles, forming a dual-gradient change trend. This FGM structure exhibits a multi-performance balance of strength, ductility, anti-wear and damping properties, making it a promising candidate for the cost-effective application in multi-performance heterostructured components. This article reports a novel technique to manufacture FGM structures using a wire-and-powder co-delivery method. The resulting dual-gradient TiC-B4C/Al composite structure exhibits a balance of strength, ductility, anti-wear and damping. [ABSTRACT FROM AUTHOR]

An optical fiber magnetic field sensor based on lossy mode resonance (LMR) was designed. Furthermore, a hollow core-offset structure was designed to enhance the performance. Due to the destruction of the circular symmetry structure, the sensor has strong birefringence, resulting in x-polarization and y-polarization with two independent resonance valleys. The refractive index changes from 1.358 to 1.390 and a high sensitivity of 11,483.12 nm/RIU was obtained. In addition, the influence of structural parameters on the sensor was investigated. Magnetic field sensitivities of 893 pm/Gs and 754 pm/Gs were obtained theoretically. The feasibility of LMR is demonstrated for magnetic field measurements and a reference is provided for an optical fiber magnetic field. [ABSTRACT FROM AUTHOR]

We present a design and systematic numerical study of an amorphous Si/metal plasmonic solar cell structure for the total ratio of light trapping at visible frequencies. The proposed plasmonic structure consists of periodic metallic grating arrays on the side of semiconductor active layer of solar cell. The total ratio of light trapping of 3.48 can be achieved, which attributes to the localized surface plasmon generated from the metallic grating enhancing light absorption in the active region. The influence of the geometry parameters and conductor material on the total ratio of light trapping for the plasmonic solar cell has been also investigated. The results can be used for the practical device design. [ABSTRACT FROM AUTHOR]

A convenient and efficient method for synthesis of substituted 2,4,6-triarylpyridines by the reaction of chalcones and ammonium acetate or via one-pot, three-component condensation of aromatic aldehydes with acetophenones and ammonium acetate has been developed by using the efficient catalyst PEG1000-based dicationic acidic ionic liquid (PEG1000-DAIL) under solvent-free conditions. Recycling studies have shown that the PEG1000-DAIL can be readily recovered and reused several times without significant loss of activity. [ABSTRACT FROM AUTHOR]

Based on transformation optics theory, a kind of N-sided irregular polygonal cavity camouflage coating is proposed in this paper. The constitutive tensors of the camouflage coating are derived, and the functionality of the proposed coating is validated by full wave simulations. Simulation results show that the designed camouflage coating all has the same near and far field distributions with that of the bare PEC cavity in different incident angles and directions. In addition, this approach can be further to design N-sided irregular polygonal ground plane cloak with homogeneously anisotropic parameters. In order to apply at optical wavelength, the performance of the nonmagnetic camouflage coating is also verified. The simulations show that the reflective fields of nonmagnetic camouflage coating well agree with that of ideal coating except for incident direction because of the boundary impedance mismatching. Since the parameters of the designed camouflage coating are homogeneously anisotropic, it is expected that the proposed camouflage coating may find potential applications in the electromagnetic field engineering. [ABSTRACT FROM PUBLISHER]

Objective: The aim of this study is to investigate whether certain combination of maternal killer cell immunoglobulin-like receptors (KIR) and fetal human leukocyte antigen-C (HLA-C) is risk for preeclampsia in the Chinese Han population. Methods: A case-control study was conducted in 47 pregnant women with preeclampsia and 54 normal pregnant women. Twelve KIR genes were genotyped by PCR-sequence-specific primer in mothers. High-resolution HLA-C genotyping was performed in couples and fetuses by a routine sequencing-based typing method. Results: The frequency of KIR2DS1 was decreased ( p = 0.028) and AA genotype was increased ( p = 0.017) in preeclampsia compared with controls. More women with KIR AA genotype have fewer C2 genes than their fetuses in preeclampsia than controls. Conclusion: Women with KIR AA genotype and fewer C2 genes than their fetuses were at risk for preeclampsia in the Chinese Han population, supporting that maternal-fetal KIR-HLA-C interaction plays an important role in preeclampsia development. [ABSTRACT FROM AUTHOR]

The reduction of nitroarenes to azoxybenzenes by NaOH-PEG 400 in benzene is described. The protocol is facile, economical, and effective. [ABSTRACT FROM PUBLISHER]

The enantiomers of fifteen O,O-dialkyl-2-benzyloxycarbonyl-aminoarylmethyl-phosphonates are directly separated on cellulose tris(3,5-dimethyl-phenylcarbamate) chiral stationary phase using different alcohols as organic mobile phase modifier. The influence of the position and properties of substituents in benzene ring, the length and steric hindrance of alkoxyl groups of the phosphonate ester on the chiral separation were discussed using different alcohol modifiers namely, ethanol, n-propyl alcohol, isopropyl alcohol, and n-butyl alcohol. The study indicates that with the use of different alcohol modifiers in mobile phase, the capacity factor (k) was in the order of k[SUBEtOH]