Materials Literature
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The chemical components of Oxyropis glacialis were determined by using phytochemistry composition preliminary systematic test,alkaloids systematic extract method and TLC in the present study.The results showed that Oxyropis glacialis contained alkaloid,amine acid and protein,organic acid,phenols and tannin,polysacchar…
Based on the penetration experiments,protective performance of three advanced structures of multilayered composite armors was studied and compared in this article.And the protective mechanism of these armors was analysed briefly.The results show that the multilayered composite armor of ceramic /steel/FRP has the most…
Using β-ionone as raw material and 50% hydrogen peroxide as oxidant,β-cyclohomocitral was synthesized.The effects of the type and amount of catalyst,the reaction time,the reaction temperature,and the amount of oxidant on β-cyclohomocitral yield were investigated.The optimum reaction conditions were obtained by single…
A new method for the synthesis of N-carboxymethyl chitosans was developed by the reaction of chitosan with chloroacetic acid instead of glyoxylic acid with Na2CO3 as binding acid.Their structures were well characterized by Fourier transform infrared spectrum(FT-IR),nuclear magnetic resonance spectrum (1H-NMR and 13C-N…
TiO_2/PEMA composite material was prepared by microwave irradiation with one-step method in ionic liquids ([Bmim]BF_4) and vacuum drying, and characterized by means of XRD, SEM and IR. By testing its absorbency in ethyl acetate and photocatalytic activity with methyl orange as degradation agent and using ultraviolet l…
The sedimentation effect of chitosan to lentinan extraction was studied.The conditions of dosage of chitosan,sedimentation time and acidity of solution to the pigment adsorption,protein sedimentation and lentinan losing were investigated,at the same time,the influences of membrane flux of ultraflitration by sedimentat…
An anion stabilizing agent of dispersion polymerization was formed in the paper.The intrinsic viscosity was 2～4 dL/g and concentration was 20 % and viscosity was 200～300 mPa·s.The characteristics of the stabilizing agent is of macromolecule and surfactant.It had outstanding disperse stability.Disperse emulsion of acry…
When the transmission tower is hot-dip galvanized,part of the surface is not plated,and the tower shall be galvanized again,resulting in increase of zinc consumption and waste of labor and equipment.It is found that the problem is caused by unsatisfactory pretreatment of workpiece surface,poor control of plating assis…
A series of CoAl2O4 spinel catalysts were prepared by Sol-Gel method using aluminium isopropoxide and cobalt nitrate as precursors.The catalysts were used for deep catalytic oxidation of o-xylene after reduction in hydrogen.The influences of n(Co)/n(Al),reduction temperatures and contacting time on the catalytic perfo…
The mechanisms of antioxidant response in salt tolerance in algae are poorly understood.Navicula lanceolata is a euryhaline diatom from salterns.Effects of long-term hypersaline and hyposaline stresses on the antioxidant defense system were studied in this study.Compared to control salinity condition(1.6% NaCl),a long…
牙科金属材料在潮湿的口腔中使用时,可与口腔环境中的许多理化组分发生化学反应,产生腐蚀.同时,口腔是一个多菌群的复杂生态环境,其中的微生物会对金属材料的腐蚀产生一定的影响,即发生微生物腐蚀,微生物腐蚀是由微生物生命活动引起或促进材料的腐蚀破坏.口腔环境的温度、唾液的组成和pH值能对微生物腐蚀产生不同的影响.另外,牙科金属材料本身的元素组成、组织结构和加工处理过程的不同也会产生不同的腐蚀过程和结果.微...
In order to increase the cable electric property and fire safety and reduce the production costs,a semi-con-ductive flame retardant tape for electric cables was developed which employs the glass fabric as the skeleton material added by semi-conductive flame retardant adhesive.
The paper systematic introduced the basic point and knowledge about knitwear.It concretely introduced the method of analysis or calculation and parameters about all kinds of cashmere sweater,summed up the knitwear about the most appropriate fashion close suitable shape to enhance sleeve’s beauty and shape.By number an…
The bending area of austenitic stainless steel,duplex stainless steel,stainless steel weld overlay and stainless steel welded joint which had crack or fracture after intergranular corrosion testing were studied by metallographic,electronic scanning and transmissiom microscope.The results show that the test evaluation…
The 1,4-butanlene gallate(BG) was synthesized by esterification from gallic acid and excessive amount of 1,4butanediol using p-toluenesulfonic acid as catalyst.The effects of reaction condition on the product yield were studied.The optimum reaction condition is the amount of catalyst 6 %(based on the mass of gallic ac…
Spherical titania particles with colltrollable particle size were prepared by sol-gel synthesis with the addition of a salt solution.The particles were characterized by SEM,XRD,IR,TG-DSC,the influence of various kinds of salt solution and concentrations on the particle size and the size distribution were investigated…
The wear properties of new metal-ceramic wear-resistant materials were tested under dry sliding condition using wear test machine,and the wear resistance was compared with high chromium cast iron,then the wear mechanics was researched.The results show that the wear resistance of the material is much better than high c…
Using a first-principle method, the electronic structures and the impurity formation energy of ZnO, ZnO (N), ZnO (N+B), and ZnO (2N+B) have been calculated, based on which the feasibility to obtain p-type ZnO is discussed.According to the results, when ZnO is single doped by N, the acceptor level is deep, and the form…
The peroxidase(POD) isozyme zymogram of Polygonum runcinatum and 4 groups of P.runcinatum var.sinense in Liupanshui were studied through polyacrylamide gel vertical flat electrophoresis.The result showed that POD isozyme zymogram of Polygonum runcinatum and P.runcinatum var.sinense had 10 bands,in which,P.runcinatum h…
Copper/ Copper alloy is widely used in industry for its excellent heat transfer,mechanical prosperity and some corrosion resistance.But the efficiency of devices will be lowered for corrosion or filth during their applications.So pickling is a normal and expedient way to remove dirt and recover devices’ functions.Howe…