Materials Literature
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The processes of tumor invasion and metastasis have been well characterized at the molecular level, and numerous biomarkers of tumor aggressiveness have been discovered. Molecular imaging offers the opportunity to depict specific cell markers relevant to tumor aggressiveness. Here, we describe the role of MRI in ident…
Ultrasonic cavitation induced degradation of Congo red in aqueous solution was investigated for a variety of operating conditions. It is found that the degradation of Congo red in aqueous solution follows pseudo-first-order reaction kinetics and the degradation rate is dependent on the initial concentration of Congo r…
Hierarchical analysis of the fracture toughness enhancement of carbon nanotube- (CNT-) reinforced hard matrix composites is carried out on the basis of shear-lag theory and facture mechanics. It is found that stronger CNT/matrix interfaces cannot definitely lead to the better fracture toughness of these composites, an…
Intrinsically conductive polymers have achieved demanding interest in the field of corrosion control coatings owing to their conductive ability and also due to the strict environmental regulations on conventional heavy metals coatings. This multipurpose class of polymers has shown to be effective and proven themselves…
The sol-gel method was used to synthesize nickel-alumina catalysts with various nickel loadings. Chemical and physical properties of support and supported nickel were characterized by TGA, DTA, EDX, SEM, BET, XRD and TPR techniques. Calcination temperature (500°C) was determined by performing thermogravimetric and dif…
We studied nanoprecipitates and defects in p-type filled skutterudite CeFe4Sb12 prepared by non-equilibrium melt-spinning plus spark plasma sintering method using transmission electron microscopy. Nanoprecipitates with mostly spherical shapes and different sizes (from several nm to several tens of nm) have been observ…
Using first-principles calculations, we explore the possibility of functionalized graphene as high performance two-dimensional spintronics device. Graphene functionalized with O on one side and H on the other side in the chair conformation is found to be a ferromagnetic metal with a spin-filter efficiency up to 85% at…
The luminescence properties of Bi-doped silica fibres in the near-infrared region are discussed. Bi-doped fibre lasers and amplifiers and their dependence on the unsaturable loss and excited state absorption are also discussed.
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黏质沙雷菌是引起肠道外感染的重要病原菌,与许多院内感染的暴发流行有关,可引起肺炎、败血症和术后感染等[1].碳青霉烯类药物对产ESBL和AmpC酶革兰阴性杆菌尤其是肠杆菌科细菌具有良好的抗菌活性,随着碳青霉烯类抗菌药物的大量使用甚至过度治疗,临床耐药菌株也已出现且检出率逐年提高,给临床治疗和控制院内感染带来新的挑战.产碳青霉烯酶是引起临床肠杆菌科细菌对碳青霉烯类药物耐药的主要原因.本研究对从我院ICU收集的3株碳青霉烯类抗菌药物耐药的黏质沙雷菌耐药机制进行分析研究。
The questions of using the concepts and methods of nanoscopic research in soil science are considered. These include the concept of nanoscopic particles, fundamental features of nanoscopic substances, genesis and geography of a large number of minerals with pronounced nanoscopic properties in soils. A number of regula…
在涂有中间层SnO2-Sb2O5的Ti基体上,采用阳极复合电沉积法制备了Ti/SnO2-Sb2O5/PbO2＋nano-Co3O4复合电极材料,利用X射线衍射（XRD）、X射线光电子能谱（XPS）和扫描电子显微镜（SEM）等方法研究了制备条件对该复合电极材料组成、结构和形貌的影响.结果表明,纳米Co3O4的掺杂可提高PbO2电极表面的粗糙度和空隙率;沉积电位、镀液中Co3O4粒子浓度及有机溶剂的添加等均对镀层中Co3O4的嵌入量有较大影响.
利用真空Kelvin探针力显微镜（KFM）研究了纳米尺度下n-AlGaN/GaN薄膜的表面电荷性质并进行了定量测量.结果表明,n-AlGaN/GaN薄膜的表面位错均为电活性的受主型表面态,所捕获电荷的区域远远大于表面位错的大小,其表面电势与GaN薄膜表面电势的最大差值达到590 mV.在光照下,n-AlGaN/GaN薄膜的表面电荷发生了明显的光生电荷重新分布现象.
以水热处理的纳米HZSM-5为载体,通过螯合剂乙二胺四乙酸（EDTA）改性制备了一种具有较高脱硫活性和稳定性的EDTA-NiMo/HZSM-5催化剂,并用XRD,ICP,FTIR,27Al MAS NMR,TG-DTA,Py-IR及NH3-TPD等手段对催化剂进行了表征.结果表明,EDTA与载体之间具有较强的相互作用,这种强相互作用减弱了金属活性组分与载体之间的作用力,抑制了非活性NiAl2O4和Al2（MoO4）3的形成,有利于活性组分在载体表面的分散,并且添加的螯合剂与金属组分镍可以形成稳定的螯合物,在硫化过程中能改变催化剂的硫化顺序,促使有效脱硫活性中心的形成,提高了催化剂的脱硫活性和稳定性.
In this issue, Ng and colleagues describe their outside-in identification of genes involved in the expression of unusual type IV pili in the archaeon Methanococcus maripaludis (13). This intriguing tale, like many in science, hints at chapters not yet written and contains a common theme…expected the unexpected.
We present simulation results of the build-up of the electron-cloud density n{sub e} in three regions of the FNAL Main Injector (MI) for a beam fill pattern made up of 5 double booster batches followed by a 6th single batch. We vary the pulse intensity in the range N{sub t} = (2-5) x 10{sup 13}, and the beam kinetic e…
The geodesic distance (path length) and effective resistance are both metrics defined on the vertices of a graph. The effective resistance is a more refined measure of connectivity than the geodesic distance. For example if there are k edge disjoint paths of geodesic distance d between two vertices, then the effective…
This paper describes a highly accurate dose control circuit (DCC) for the emission of a desired number of electrons from vertically aligned carbon nanofibers (VACNFs) in a massively parallel maskless e-beam lithography system. The parasitic components within the VACNF device cause a premature termination of the electr…
Specific heat was measured over the temperature range 0.4–25 K in GeO2 glasses, compacted at pressures of 2 and 6 GPa to achieve more than 20% densification. Above 1 K, specific heat C was reduced by up to a factor of 2.5 with increasing density; the variation being stronger than that observed below 1 K. The broad pea…
In the present paper, we prove the basisness of the root functions of the non-self adjoint Sturm-Liouville operators with periodic and anti-periodic boundary conditions in space Lp(0,1), p>1. Here we assume that the potential is absolutely continuous in [0,1].