Materials Literature
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The heat treatment of quenching and tempering for high speed steel containing V and Nb was carried out.The influences of quenching temperature and tempering temperature on the hardness of high speed steel were studied.The heat treatment process to gain high hardness grain-type carbide distributing was determined,throu…
Ⅱ-Ⅵ Cd-based compounds with the characteristics of direct band gap,high optical absorption coefficient,and excellent electrical properties,have been extensively used in solar cells,X-and γ-ray detectors,infrared focal plane arrays(FPAs),etc.In this paper,progresses in molecular-beam-epitaxy(MBE) growth and device appl…
According to the combustion characteristic of asphalt,the asphalt flame retardant mechanism and application were analyzed.This paper listed some commonly used flame retardants and discussed the flame retardant mechanism,summarized the preparation methods of flame retardant asphalt and asphalt mixture,as well as conclu…
Objective To study the mechanism of puerarin(PE) intestinal absorption and investigate the possible methods to improve its intestinal absorption.Methods The characteristics of PE transport across Caco-2 cell monolayer were determined by changing incubation time,temperature,and PE concentration.The effect of different…
Sealed box is a device between annealing furnace and tin bath,related to the export side of the seal.This article describes a sealed box in sealed tin bath in the role of the export side,and about each of the curtain closed,joint seal,side surface seal,nitrogen seal,holes seal in the theory of several sealing methods…
The releasing fertilizer was prepared from slime and compound fertilizer through adjusting temperature and stirring speed.The optimal conditions were as follows:temperature of water bath 70 ℃,stirring speed 0.141 3 m/s.
The influences of the concentration of the acidic steam source solution,reaction temperature,filling degree of the container and the duration of the ASH on the nucleation and crystal growth processes were discussed when synthesizing VWMo·H2O by Acidic Steam Hydrothermal(ASH) route.Conditions for the above four factors…
The serious corrosion exists on the exterior and internal metal surface of the external floating roof oil tank during long-time use.The cause of corrosion was analyzed,and the corrosion-protective coating materials for exterior and internal walls of the crude oil tank were selected.A corrosion protection project was m…
OBJECTIVE:To study the genetic toxicity of NiKeAn.METHODS:the mutagenicity of NiKeAn was examined using Ames test,micronucleus test and CHL cell chromosome aberration test.RESULTS:No increase in the number of revertant colonies was found in the Ames test with and without S9 mixture.The micronucleus rates and chromosom…
Small black spotsand cracks on surface of some 65Mn steel springs were found in product inspection.The surface defect and crack morphologies,micro-area composition,microstructure and microhardness of the 65Mn steel spring were analyzed.The results show that during drawing of the spring steel wire,dense and ringent cra…
To make the overturned collar overturn accurately and simplify its structure to realize free overturning and achieve an attractive static shape,through direct drawing method,84 samples of overturned collar were made by using different fabrics,different neck widths,and different necklines,taking Japanese culture bodice…
The alkylation of 2-methylnaphthalene was studied over Co modified HB molecular sieves catalysts, and the influence of Co loading and reaction temperature on the catalytic activity was investigated. Compared with Hβ and Mg/Hβ molecular sieves,1% Co/Hβ molecular sieves exhibited better conversion of 2-methylnaphthalene…
While the intrinsic conductivity of DNA duplex is still under controversy,DNA metallization becomes a promising way to achieve enhanced conductivity of DNA and thus is the key to its applications in nanoelectronics.This review summarizes recent methodological developments in the metallization of DNA including electros…
A low temperature electroless nickel plating process on micro-arc oxidation ceramic coating of magnesium alloy was studied;The component,microstructures,corrosion resistance and wear resistance properties of the plating layer were investigated.The plating solution formula that is suitable for electroless nickel platin…
The influence of electrostatic field on the oriented growth of carbon nanotubes in V-shaped flame system was investigated via three different ways of introduction of electric field and different sizes of bias voltage: 5 V,30 V and 150 V.The experimental results were characterized via SEM and TEM,which have verified th…
A series of ceramic samples La2(Mo1-xVx)2O9-α (x = 0.02, 0.04, 0.06, 0.08) were synthesized by a solid-state reaction method. X-ray powder diffraction (XRD) patterns show that all the ceramic samples have a single cubic structure. The conductive properties of the ceramic samples were investigated using gas concentrati…
Carrying-current friction properties of PM(powder metallurgy) / QCr0.5 couples were investigated with a high-speed carrying current friction and wear tester.The results show that the electric current has an effect on arc energy,meanwhile load and speed have a marked effect on arc energy;arc erosion of powder metallurg…
MoO2 nanospheres with an average diameter of 10 nm have been synthesized by the hydrothermal method with(NH4)6Mo7O24·4H2O and HCl as the starting materials and tartaric acid as the assistant agent.The final products are characterized with X-ray diffraction(XRD),transmission electron microscopy(TEM) and scanning electr…
In the photoelectrochemical cells(PECs),the electrolyte plays an important role in the electron transfer process.In order to improve the overall efficiency of photoelectrochemical cells,it is necessary to seek out the optimal electrolyte.In this paper,the influences of six types of electrolytes on the Ⅰ-Ⅴ properties o…
By using liquid chemical deposition method,silver nitrate as raw material,hydrazine hydrate as reducing agent,polyvinylpyrrolidone(PVP) as disperse agent,ultrafine silver powder was prepared by dropping silver nitrate into reducing solution at room temperature,and then separated by filtrating with millipore filter.The…