On Structure of Finite Groups with Two Conjugacy Class Lengths of π′-Elements
Let π be a set of prime numbers,and Ga finite π-separable group.The structure of Gwith two exact conjugacy class lengths of π′-elements in Gis studied.
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Mechanism and Inhibition of Grain Coarsening of Al-Mg-Si Alloy in Hot Forming
A high-Ti 6061 alloy was rolled with strains up to 0. 8 - 2. 0 and at 350 - 550 ℃ . Microstructures that developed during deformation and subsequent solution heat treatment (SHT) were observed by using optical and transmission electron microscopy. Microstructure evolution during SHT depends mainly on the initial rolli…
Study on Lubricity of Hyaluronan Medical Lubricant
To study the lubricity of hyaluronan.The friction coefficient of samples was determined by friction coefficient tester.The lubricity of hyaluronan was better than that of the clinical commonly used medical lubricants.As a natural component exists in human body,hyaluronan has high safety and good biocompatibility,so it…
Preparation and electrochemical performance studies of nickel oxide syntheized by an improved precipitation method
NiO particles were synthesized by an improved precipitation method,and its structure and electrochemical properties were studied.The X-ray diffraction(XRD) analysis shows that the prepared material is NiO with cubic crystal phase.The scanning electron microscope(SEM) observation shows that the prepared NiO particles a…
Performance evaluation test for pre-hydrotreating catalyst LY-2010R
The pre-hydrotreating catalyst LY-2010R for reforming feedstock with excellent activity and high space velocity operation was developed.The long running performance was investigated by comparing with the main domestic catalyst.The results revealed that the hydrodesulfurization and dearsenization activity for LY-2010R…
Effect of electrolyte on low temperature discharge performance of Li-ion battery
Solvent ethyl acetate(EA) and propylene carbonate(PC) were added into normal electrolyte[LiPF6-ethyl carbonate(EC)-ethyl methyl carbonate(EMC)-dimethyl carbonate(DMC) ],the prepared low temperature electrolyte could improve low temperature discharge performance of Li-ion battery.Under- 40 ℃,the conductivity of low tem…
Experimental Study of Selective Non-catalytic Reduction of NO_xby NH_3in Flue Gas Containing SO_2
Selective non-catalytic reduction of NOxby NH3 in flue gas containing high concentration of SO2 was studied.Experiments in a fixed bed reactor showed the effects of temperature(775-975 ℃),molar ratio of NH3 to NOx(0.9-3.0),O2 concentration(5%-21%),SO2 concentration(0-0.022%),and residence time(7.9-23.6 s) on denitrifi…
Research Progress of Flame Retardant Coatings Used on Polymeric Materials Surface
Polymeric materials mainly consist of textile finishings, plastics and rubber. Among these materials, the fire proofing of textile finishings is mainly adopted by introducing the flame retardant coatings technology on its surface. However, for the plastics and rubber, the flame retardancy is still acquired by adding f…
Effect of Extrusion Temperature on Microstructure and Properties of B_4C/Al-Si Composite
B4C/Al-Si composite was prepared by hot extrusion process using Al-Si alloy powder and B4C powder as raw material.The effect of extrusion temperature on the microstructure and properties of the composite was studied.The results show that B4C distributes uniformly in Al-Si matrix,and no particle agglomeration is found.…
Synthesizing lithium sulfur battery cathode material nickel sulfide by microwave method
Nano-spherical nickel sulfide(NiS) was synthesized by microwave method.The products were analyzed by means of XRD and SEM and galvanostatic charge-discharge tests.The synthesized NiS was pure phase α-NiS,the particle size was uniform without significant agglomeration.When cycled in 1.0～3.0 V with 0.5 C,the initial spe…
Effect of Heat Treatment and Al Doping Content on the Photoelectric Properties of AZO Thin Film Prepared by Sol-Gel Method
The AZO thin films were prepared on the glass substrates by sol-gel with rotating film method using( CH3COO)2Zn ·2H2O and AlCl3·6H2O as precursors. The phase composition,morphology,transmittance and square resistance of AZO thin film were measured and characterized by X-ray diffraction,scanning electron microscopy, UV…
The steam injection pressing molding mechanism of bindless bamboo particleboard
Bindless bamboo particleboard which takes bamboo particle as its raw material was prepared by steam injection pressing in this paper.Fourier transform infrared spectroscopy(FT-IR),solid-state nuclear magnetic resonance spectral analysis(CP/MAS 13C NMR),high performance liquid chromatography analysis(HPLC) and specific…
Properties and Preparation of Polyamide 6 Thermally Conductive Insulating Composite Materials Filled with Different Fillers
Polyamide 6 thermally conductive insulating composite filled with alumina,aluminum nitride,boron nitride or silicon carbide was manufactured by twin-screw extruder.Influences of filler type and content on thermal conductivity,electrical insulation property,mechanical property and heat deflection temperature of composi…
Effect of plant fiber on the properties of cement based materials
The paper brings forward to produce the new wall materials by waste agricultural fibrous materials,such as rice straw,corn stalks and other agricultural wastes;researches the effect of plant fiber extracted by the chemical modification methods on the setting time,compressive and flexural strength,and reduction of wate…
Effect of Pulse Voltage in Plasma Electrolytic Oxidation on Structure of Ceramic Coatings on 2024 Aluminium Alloy
Ceramic coatings on the surface of 2024 alloy were prepared by plasma electrolytic oxidationCPEO) in the electrolyte solution rich in ultra-fine SiC powder.The effects of the pulse voltages on the thickness,growth mechanism,structures and corrosion behavior of coatings were systematically discussed.The results show th…
Preparation and Electrochemical Double-Layer Capacitor Application of Porous Carbon Microspheres Based on Porous Starch
Porous carbon microspheres with a high S BET surface area have been prepared selected porous starch as precursor. The synthetic process composed of ammonium secondary phosphate catalyzed stabilization,carbonization and KOH activation at different mass ratios of KOH / C. The morphologies and pore textures of the result…
Flashover Performance of Long-String Insulators of DC Power Transmission Line at High Altitude
Along with the commencement of DC power transmission projects in the western region,the external insulation of DC transmission line has become a problem at high-altitude area. However,there is no uniform understanding on how to correct high-altitude influence on the pollution voltage of DC long-string insulators. The…
Influence of fly ash admixture and wet-dry times on chloride binding capacity of concrete
The free chloride and total chloride of concretes were determined with natural diffusion method,the chloride binding capacity of fly ash concretes were computed,the influence of fly ash admixture content,wet-dry cycle times on the chloride binding capability of concreted.The results showed that with the increase of fl…
Study on functional polyester semi-inlaid with sucrose ester and grafted with sericin protein
In this paper,polyester was firstly semi-inlaid with sucrose ester,and then grafted with sericin protein with crosslinking agent.SEM Image showed that after inlaying,a layer of compound was covered on the surface of the polyester fiber,and after grafting,the covered layer became thicker.FT-IR indicated that sericin pr…
Experimental study and numerical simulation of cryogenic treatment of cold-work die steel SDC99
Using the low temperature physical parameters of cold-work die steel SDC99 obtained from experimental test and the boiling heat transfer coefficient acquired by an empirical formula method,a finite element model is built to simulate the cryogenic treatment of a cold-work die steel specimen immersed in liquid nitrogen…