Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The effect of Pb-Sb-Cu alloy casting techniques on its electrical properties was investigated following casting of the alloys using using three different techniques; Technique A, Technique B, Technique C and cooling of the alloys after casting in the furnace and determining their electrical properties. Technique A, in…
We report measurements of dynamic (ac) electrical conductivity in borosilicate glasses doped with the semiconductors CdSxSe1-x and AgI in a wide range of frequencies and temperatures. The concentrations of homogenously dissolved dopants are governed by the heat treatment conditions of the glass samples leading to a cr…
Synthesis of carbon nanofibers by thermal decomposition of carbon disulfide and study of their properties and electric transport as function of temperature is reported. Carbon disulfide is used as a precursor; three combinations of iron and silver were used as catalysts. When iron is used as a catalyst, an anomaly in…
This study comprised the synthesis and characterization of select phosphine ligands and their complexation to gold(I).An initial approach was the reaction between Ph 2 PCl in "wet" organic solvent and [ClAu(tht)] (tht = tetrahydrothiophene) which led to the complex [ClAu{Ph 2 P(OH)}], 1, which was the second polymorph…
Steel welding using induction heating to produce pipelines is found to have lower toughness at the weld junction than the base material, even after a heat treatment which reaustenitises the weld zone. Detailed crystallographic characterisation indicates that the poor toughness is due to the crystallographically coarse…
GAO Building, 441 G Street NW, Washington, DC). To improve security and efficiency, G Street will become the single designated visitor entrance/exit to GAO Headquarters effective Monday, October 20. All visitors and non-GAO personnel not in possession of a GAO access badge, including those on access lists for the fitn…
clays were used for the immobilization of two different complexes that have previously shown catalytic activity in the dismutation of superoxide radicals, and disproportionation of hydrogen peroxide. The obtained results indicated the occurrence of an intriguing intramolecular redox process involving copper and the im…
We proposed a novel fabrication method of the microlens array (MLA) using liquid crystalline polymer (LCP). By using the electrohydrodynamics (EHD) technique, we can easily obtain the MLA having a polarizationdependence property. Therefore, we believe that it is applicable to the data pickup system of double-layer DVD…
Among different types of ceramics, 8 mol%-Y2O3 stabilized zirconia (8YSZ) because of its high oxygen ionic conductivity and chemical stability over a wide range of temperature is a well known candidate for oxide fuel cells. In the present study, the effect of different shaping method on densification and grain growth…
Summary We show that a resonant response with very high quality factors can be achieved in periodic metamaterials by radiatively coupling their structural elements. The coupling is mediated by lattice modes and can be efficiently controlled by tuning the lattice periodicity. Using a recently developed terahertz (THz)…
研究比较了纳米TiO2、纳米ZnO、纳米SiO2对石油沥青双组分聚氯酯防水涂料性能的影响。结果表明，纳米粒子的添加可显著地改善涂膜的耐候性能、耐酸性能，提岛涂膜的硬度、抗张强度和断裂伸长率；对涂膜耐候性改善程度依次为纳米TiO2〉纳米ZnO〉纳米SiO2，而对涂膜硬度、抗张强度、断裂伸长率提高程度依次为纳米SiO2〉纳米ZnO〉纳米TiO2纳米粒子较佳的添加量为物料总质量的3％～5％。
Nanoparticles functionalized with ionizable ligands can exist in either dispersed or aggregated states at the same value of pH. This bistability and the related hystreresis accompanying pH changes derive from a subtle interplay between electrostatic and van der Waals forces. A theoretical model allows one to control t…
por el tipo de modificante que se utiliza en la arcilla. PALABRAS CLAVE: Espectroscopia microRaman, montmorillonita, organoclay, surfactante, intercalacion. ABSTRACT: The microRaman spectroscopy and Xraydiffraction (XRD) was used as analytical techniques in pristine and hybrid clay. It was determined that the wate…
precursor to several neurologically important catecholamines and also is one of the major pharmaceutical agents for the treatment of the main symptoms of Parkinson's disease [2] . The intercalation of the levodopa into an inorganic host, LDH can be used as a means to form a new organic-inorgani c hybrid material. The…
Chitosan derivative was successively synthesized by initial preparation of acylthiourea reagent using ammonium thiocyanate and making it to react with at primary amino groups of chitosan and then reduced to yield thiolated chitosan. Due to the formation of disulfide bonds with mucus glycoproteins, mucoadhesiveness is…
Summary Antimicrobial activity of ethanolic extract of leaves of Nyctanthes arbor-tristis L. was examined against selective bacteria and moulds by using disc diffusion method. It showed significant antibacterial activity at 100 µg / ml against Candida albicans (MTCC 227) and E. coli (MTCC 443) however it showed antiba…
The relatively small band gap values (~1eV) of CuInSe2 thin films limits the conversion efficiencies of completed CuInSe2/CdS/ZnO solar cell devices. In the case of traditional two-stage growth techniques, limited success has been achieved to homogeneously increase the band gap by substituting indium with gallium. In…
Graphene nanoribbons (GNR) have received a great deal of attention due their promise for electronics and optoelectronic applications [1]. Recently, the formation of GNR was observed “in situ” by unzipping of carbon nanotubes under ultra-high vacuum scanning tunneling microscopy (UHV STM) [2]. The CNT under observation…
Showed environmental degradation and poor catalyst mixing in Ca(BH4)2 and Mg(BH4)2 systems (with Sandia National Laboratories [SNL]). Identified regions of CaB6 in possible Ca(BH4)2, supporting limited reversibility (with SNL). Determined structure and chemistry of contaminant layers on (de)hydriding cycle (with the U…
Formerly by in vitro EPR spin-trapping technique we have demonstrated that nitroxyl free radical containing (spin-labeled) nitrosoureas 1-ethyl-1-nitroso-3-[4-(2,2,6,6-tetramethylpiperidine-1oxyl)]-urea (SLENU) and N-[N'-(2-chloroethyl)-N'-nitrosocarbamoyl]-glycine amid of 2,2,6,6tetramethyl-4-aminopiperidine-1-oxyl (…