Materials Literature
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Tell the atoms where to go: By manipulating the rate at which Ag atoms were generated from a precursor, the nucleation and growth of Ag on Pd nanocubes with six equivalent {100} facets were controlled to generate three different types of bimetallic nanocrystals: Pd–Ag hybrid dimers, Pd–Ag eccentric nanobars, and [emai…
The strain dependence of conductance of monolayer graphene has been studied experimentally here. The results illustrate the notable transitions: the slight increase, the dramatic decrease, and the sudden dropping of the conductance by gradually increasing the uniaxial strain. The graphene conductance behaves reversibl…
The adsorption of graphene on Ni(111) has been investigated on the basis of the adiabatic-connection fluctuation-dissipation theorem in the random phase approximation (RPA). Although we find a significant hybridization between the graphene $\ensuremath{\pi}$ orbitals and Ni ${d}_{{z}^{2}}$ states at a binding distance…
Graphene consists of a monolayer of sp(2) bonded carbon atoms and has attracted considerable interest over recent years due to its extreme mechanical, electrical, and thermal properties. Graphene nanocomposites have naturally begun to be studied to capitalize upon these properties. A range of complex chemical and phys…
We present a Monte Carlo method for obtaining solutions of the Boltzmann equation to describe phonon transport in micro- and nanoscale devices. The proposed method can resolve arbitrarily small signals (e.g., temperature differences) at small constant cost and thus represents a considerable improvement compared to tra…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTSpherulitesAlexander G. Shtukenberg*†‡, Yuri O. Punin‡, Erica Gunn#, and Bart Kahr*†#View Author Information† Department of Chemistry, New York University, 100 Washington Square East, New York City, New York 10010, United States ‡ Department of Crystallography, Geological Fac…
Organic thin-film transistors (OTFTs) show promising applications in various chemical and biological sensors. The advantages of OTFT-based sensors include high sensitivity, low cost, easy fabrication, flexibility and biocompatibility. In this paper, we review the chemical sensors and biosensors based on two types of O…
以环己烷为溶剂,1,1-二苯基乙烯（DPE）与正丁基锂（n-BuLi）反应得到1,1-二苯基己基锂（DPHL）,对其产率、稳定性和引发活性进行了研究。然后以DPHL为引发剂,四氢呋喃为结构调节剂,采用负离子聚合方法合成了线形溶聚丁苯橡胶（SSBR）;最后以SnCl4偶联制备星形SSBR。用凝胶渗透色谱仪、核磁共振对产物进行了表征,考查了端基结构、聚合反应时间和偶联剂用量对SSBR偶联效率的影响,研究了硫化胶性能。结果表明,n（DPE）/n（n-BuLi）为1时,DPHL产率和纯度较佳,DPHL在2℃冰箱中保存时间超过30 d,浓度降为初始浓度的90%以下;引发剂残基＂双苯环＂存在于聚合物链末端;分子量为7×104,聚合反应时间为6…
采用高温固相两步法制备了两种Li1.4M0.4Ti1.6(PO4)3(M=Al、Cr)系列NASICON功能材料,对不同掺杂合成的样品进行了XRD和SEM表征,并分别对其Na+的交换吸附容量进行了测定。结果表明,对LiTi2(PO4)3掺入适量的Al3+和Cr3+后未改变其晶体结构,合成的吸附剂粒径分布在5~10mm;Li1.4M0.4Ti1.6(PO4)3(M=Al、Cr)对Na+有特效吸附作用,当pH=11.0时,Li1.4Al0.2Cr0.2Ti1.6(PO4)3的饱和交换吸附容量可达69.26mg/g。
Though it has been recognized that a role of lighting in the display of clothing is important from the point of view of VMD (visual merchandising) of apparel，there has been no special guide to selecting lighting associated with a certain impression to be emphasized. In the present study，the difference of the color imp…
A decade after the invention of X –ray machines, radiographic rooms shielding became one of the major concerns of the scientists related to radiation, so that after 100 years after the invention of X–ray machines, there are still some discussions in national and international reports concerning this issue. One of the…
近年来原位肝移植(Orthotopic liver transplantation)已发展成为当今治疗终末期肝病惟一有效的方法,但移植后胆道并发症的发生,则严重影响患者的生活质量,成为手术失败的主要原因之一.其发生原因包括缺血-再灌注损伤、免疫排斥、吻合口狭窄等,针对其发生的机制,我们可以采取相应的预防及治疗措施.现就肝移植后胆道并发症的发生及诊治进展进行综述。
We predict that graphene is a unique system where disorder-assisted scattering (supercollisions) dominates electron-lattice cooling over a wide range of temperatures, up to room temperature. This is so because for momentum-conserving electron-phonon scattering the energy transfer per collision is severely constrained…
Few-layer graphene (FLG) is grown on copper and nickel substrates at high rates using a novel flame synthesis method in open-atmosphere environments. Transmittance and resistance properties of the transferred films are similar to those grown by other methods, but the concentration of oxygen, as assessed by XPS, is act…
We examine the classic problem of homogeneous nucleation and growth by deriving and analyzing a fully discrete stochastic master equation. Upon comparison with results obtained from the corresponding mean-field Becker-Döring equations we find striking differences between the two corresponding equilibrium mean cluster…
Virgin newsprint paper from thermo-mechanical pulp was subjected to a laboratory recycling scheme, which involved mimeograph-printing, re-pulping, de-inking, washing, refining, and handsheetforming, without adding other fibre in between cycles. Fibre dimension, pulp freeness and paper properties were determined after…
A bubble coalescence model is developed using an Euler–Lagrangian approach for unstructured grids. The Eulerian carrier fluid is solved using large-eddy simulation (LES) and the Lagrangian particle motion is solved with equations relating the turbulent motion of the carrier fluid to forces on each discrete bubble. The…
In this paper we will develop a sequential life test approach applied to a modified low alloy-high strength steel part used in highway overpasses in Brazil.We will consider two possible underlying sampling distributions: the Normal and theInverse Weibull models. The minimum life will be considered equal to zero. We wi…
【Objective】 To investigate the effect of Bmi-1 gene knockdown on the proliferation and apoptosis in human SO-RB50 cells.【Methods】 Bmi-1 expression was examined in human retinoblastoma tissue and SO-RB50 cells by immunohistochemistry and RT-PCR.Chemically synthesized Bmi-1 siRNA was transfected into SO-RB50 cells.After…
为了研究甲氧苄啶（Trimethoprim,TMP）与羟丙基-β-环糊精（HP-β-CD）在水溶液中的包合作用、包合过程中的热力学参数变化及包合比,试验分别采用相溶解度法、等摩尔系列法、摩尔比率法测定了TMP与HP-β-CD的包合表观常数、包合过程的熵变、焓变、自由能变化及包合比。结果表明,在不同温度下,TMP与HP-β-CD在水溶液中均可形成1∶1摩尔比的包合物,相溶解度图呈AL型;TMP与HP-β-CD的包合过程可自发进行（△G〈0）,且为放热反应（△H〈0）,同时也是熵值增大的过程（△S〉0）;说明TMP与HP-β-CD在水溶液中均可自发形成1∶1摩尔比的包合物,从而增加其溶解度。选择适宜的包合温度将有利于包合过程的进行。