Materials Literature
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Graphene,a monolayer of graphite,has attracted increasing attention since its discovery because of its unique two-dimensional(2D) structure,excellent mechanical,thermal and electronic properties. Currently,great effort has been carried out for the preparation and function of graphene,as well as its use in the energy c…
In order to calculate the electron energy distribution in the fuel rod gap of a VVER-1000 nuclear reactor,the Fokker-Planck equation(FPE)governing the non-equilibrium behavior of electrons passing through the fuel-rod gap as an absorber has been solved in this paper.Besides,the Monte Carlo Geant4 code was employed to…
The tribological properties of the micron level molybdenum disulfide powder were investigated by way of four-ball test in lithium grease,and a comparison was made between molybdenum disulfide and the compounded system which consisted of molybdenum disulfide and crystalline layered sodium disilicate.The elements of the…
认识到在 graphene 和金属电极之间的低接触抵抗为造高效的 graphene 设备仍然是著名挑战。在这个工作，我们试图在 graphene 晶体管减少接触抵抗并且进一步探索在 graphene 和金属接触之间的抵抗限制。在房间温度的 Pd/graphene 接触抵抗在 100 ?? 下面被减少 ? ?? 汣獡 ? 愢瀭畬 ? 汰獵?? 猯'T ￣慮潮慰瑲捩敬 ? 敤潣慲整 ? 湯吠佩猼'T 挠慬獳∽ ? 汰獵瀭畬 ? 资 ? ?? 渠湡景扩牥 ? 湥 'L 敬 ? 桴 ? ?捣獥晳汵椠瑮来慲楴湯漠 ? 桴 ? 楢慮祲挠浯潰楳整椠瑮 ? 慢瑴牥敩 ? 潴愠摤敲獳猠牴 ' 壮霊 `? 瑳 'L 汩瑩 ? 湡 ? 潬 ? 慣慰楣吗？
【Objective】Strength and elongation variation among different silkworm(Bombyx mori) varieties were studied to provide references for screening breeding materials of silkworm. 【Method】Two grains with identical cocoon width of48 varieties of silkworm cocoon were selected. Strength and elongation of per hundred HUI at the…
This research aim to know the effect of welding speed to mechanical and physical properties on dissimilar metal’s joint between carbon steel St.37 and Aluminum AA1001 with 3 mm of thickness using Friction Stir Welding (FSW). Oxy-Acetylene welding were used to preheat the carbon steel during FSW process. The observed p…
Four group IIB metal complexes, namely [ZnCl2(Mbibix)]n (I), [Cd2(Ac)4(Mbibix)2] ⋅ (H2O) (II), [HgCl2(DMF)(Mbibix)]2 (III) and [HgI2(Mbibix)]2 (IV), have been achieved via the reaction of corre sponding metal salts and organic spacer Mbibix (Mbibix = 1 (3 ((2 methyl 1H benzimidazol 1 yl)methyl)benzyl) 2 methyl 1Hbenzi…
This article presents a detailed structural study of a new spherical MgCl2-supported TiCl4 Ziegler-Natta catalystfor isotactic propylene polymerization, and researches on the relationship between catalyst structure and polymer properties.The spherical support with the chemical composition of CH3CH2OMgOCH（CH2Cl）2 has b…
Microcapsules containing core materials are promising component for developing self-healing coatings.In the present work,urea-formaldehyde capsule containing core material with size of micrometer was prepared by in-situ encapsulation method.The morphology of the microcapsules was characterized by scanning electron mic…
Two complexes with formulas [Ni L][(Ni L)(IPA)2]·8H2O(1) and [(Ni L)(H2O)2] [(Ni L)(PMA)]·4H2O(2)(L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane,IPA2– = isophthalic anion,PMA4– = 1,2,4,5-benzenetetracarboxylic anion) were synthesized and characterized by elemental analyses and IR spectra.The crystal s…
High-surface-area mesoprous powders of γ-Al2O3 doped with Cu2+, Cr3+, and V3+ions were prepared via a modified sol–gel method and were investigated as catalysts for the oxidation of chlorinated organic compounds. The composites retained high surface areas and pore volumes comparable with those of undoped γ-Al2O3 and t…
In recent years, increasing attention has been attracted for using spinel Ni Co2O4 nanostructure material in the field of supercapacitors owing to its excellent electrochemical activities. In this study, the researches of Ni Co2O4 material for supercapacitors are reviewed in details, with emphasis on structure,synthet…
The electropolished(EP) alloy 690 TT samples were first oxidized in the simulated B and Li containing primary water with 2.5 mg/L H2 at 325 ℃ and 15.6 MPa for 720 h, and then half of the samples were continuously immersed in this solution with 2.0 mg/L O2 for another 720 h. The microstructures and chemical composition…
Thermal management of the polymerization reaction process is one of key factors influencing polymer quality and success in engineering scale-up. Liquid nitrogen is introduced in PPTA polymerization process in the paper, so as to investigate influence on PPTA polymerization process and polymer performance when the iner…
A porous graphene(PG) was synthesized using calcium carbonate micro-spheres as a hard template,graphene oxide prepared by the Hummers' method as graphene precursor,hydrazine hydrate as a reduction agent and N,N-dimethylformamide as a dispersion agent.The as-prepared PG was modified by chemical vapor deposition of poly…
X-ray diffraction(XRD)and Fourier infrared absorption spectroscopy(FTIR)were conducted to deepen our research on specific species and spectral characteristics of swelling clay minerals in the Pliocene sandstones in Xinghai,Qinghai province.XRD results show that swelling clay minerals are dominant clay minerals in the…
High-sensitivity and low-noise solution-gated graphene field effect transistors(SGFETs) were fabricated using chemical vapor deposition(CVD) graphene as a channel material, and their response characteristics to concentration and p H of phosphate buffered saline(PBS) were measured. The minimum conductance point shifted…
The effects of Cr content and annealing temperature on abrasive wear characteristics of cast ausferrite nodular iron were investigated with Suga type abrasive wear tester. The surface morphology and Vickers hardness of the tested samples were analyzed by scanning electron microscopy(SEM), digital microscope and Vicker…
The matrix polymer PTBCHNB bearing o-nitrobenzyl group was successfully synthesized by copolymerization of tertiary-butyl methacrylate(TBMA), cyclohexyl methacrylate(CHMA) and o-nitrobenzyl methacrylate(NBMA) via reversible addition fragmentation chain transfer(RAFT) polymerization method. PTBCHNB was characterized by…
Exploring the factors to control Znsalen aggregation is of importance to design functional materials in catalysis, optical materials and biological imaging. In this work, we synthesized and characterized four cryptand type tri Znsalen complexes and found that cryptand structure could efficiently minimize intermolecula…