Materials Literature
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A plasma immersion ion implantation(PIII) system based on inductively coupled plasma(ICP) technology was designed.The PIII system had a cylindrical chamber,and a radio frequency(RF) power was used to sustain discharge and a pulsed voltage source was provided to bias the wafer.The RF power was coupled into chamber by a…
ZnO(wurtzite) whiskers were grown via a floating zone method.The as-grown samples were characterized by X-ray diffraction and polarizing microscopy.Their characteristic peaks verify that the as-grown ZnO whiskers have excellent hexagonal wurtzite phase and(100) orientation.Raman scattering results show that when tempe…
The hardness and microstructure of 50SiMnVB steel under normalizing,normalizing-quenching-tempering,quenching and tempering were analyzed.Three groups of bigger hardness difference selected from five sample groups.They were respectively normalized 50SiMnVB alloy steel and 50SiMnVB alloy steel tempered at 200 ℃ and 600…
Objective To approach the value of low-field MRI in the diagnosis of uterine leiomyomas,and compare DSA appearance.Methods Sixteen patients with clinical diagnosis of uterine leiomyomas underwent MR examination at a low-field MR scanner and uterine artery angiography before uterine artery embolizations under DSA.Resul…
In order to improve the properties of anodized aluminum alloy,a cold sealing technique containing Ni2+ was used for the sealing of the anodized aluminum alloy.As compared with the water sealing,the corrosion resistance and wear resistance of the anodized film with/without sealing were studied by drop alkali and drop g…
Zinc-nickel alloy coating containing 10%～15%nickel is a kind of coating with high corrosion resistance and low hydrogen embrittlement,and is a study hotspot in recent years.The nickel content has a great influence on the structure and properties of the coating.A chemical analysis method of chemical deposition for nick…
Nanocrystals of Ce1-xMnxO2-δ(x=0.00,0.05,0.10,0.15,and 0.20) were synthesized by a hydrothermal reaction route.The solid solutions crystallized in a cubic fluorite structure with a particle size in the range of 11～15 nm.The incorporation of Mn ions in CeO2 resulted in a lattice volume reduction.Mn ions showed a mixed…
A335-P22 steel,as an alloy refractory steel with lasting plasticity,is widely used in for pipelines in fuel electric,nuclear electric and petrochemical industries.This steel material often appears cold cracks and reheated cracks because of overquick cooling during welding,and thus the welding quality is affected.Combi…
A mesoporous carbon monolith for use in supercapacitors has been prepared from a thermoplastic phenolic resin by curing,molding and activation with CO2.The BET surface area of the as-prepared carbon monolith is 1563m2/g,and the total pore volume is 1.87cm3/g,of which 75.9% is mesoporous in character.The unique microst…
Polyaromatic ether ketone (PAEK) resin belongs to high-temperature-resistance and high-strength engineering thermoplastics. As an alternative to glass-lined products in heavy corrosion protection of chemical equipments,it was accepted by Japan,European countries and America. In this paper,the development history of PA…
A novel compound [(IBz)2Im](TCNQ) [(IBz)2Im=1,3-bis(4-iodobenzyl) imidazole cation, TCNQ-=7,7,8,8-tetracyanoquinodimethanide anion] was synthesized by the reaction of [(IBz)2Im]Br and LiTCNQ in CH3OH and its structure was determined by single-crystal X-ray diffraction. The crystal belongs to monoclinic, space group P2…
2-Amino-7-hydroxytetralin monohydrate was synthesized from 7-methoxy-2-tetralone.7-Methoxy-2-tetralone reacted with benzylamine,then sodium borohydride was added for reduction and HCl was introduced for acidification to obtain hydrochloride of the benzyl-protecting amine.Hydrogenation of the hydrochloride was carried…
According to the aluminum slat ceiling project of the waiting hall of some station,the paper introduces the construction craft process,the control over the construction process and the acceptance standard in the aluminum slat ceiling project,and sums up the precautions in the construction,so as to accumulate the exper…
Mechanism of interaction between medium and ultrasound was concluded.Moreover,mechanisms of ultrasound used in intensifying reaction,treatment of waste water,extraction,emulsification,demulsification and membrane separation were analyzed.Finaly,it was suggested that ultrasound can be applied to the any process or syst…
The theory and simulation of the change rules of deflection of the tungsten alloy long-rod projectile that vertically penetrates into traverse moving steel plate are explored. The deflection equation of the steel long-rod projectile penetrating into traverse moving steel plate is deduced with the geostatic. The RIGID…
With tetraethoxysilane(TEOS) as silicon source,ethanol as solvent and ammonia as catalyzer,submicron SiO2 microspheres with diameter from 400 nm to 1 000 nm were prepared by modified sol-gel method.To obtain good dispersity in oil,trimethylchlorosilane(TMSCl) was used to modify the surface of SiO2.The modification eff…
When the particle dimension is smaller than incident wavelength,we discuss the scattering and absorption characteristics of the electromagnetic wave of double-layer spherical shells in centimeter wave band,and results show that the absorbing capacity and stealth of the particle with magnetic kernel are superior to non…
This paper studies the elastic response of the cylindrical shell subjected to underwater explosion wave with the test and numeric calculate method.It analyzes the elastic response of the cylindrical shell subjected to underwater explosion with the sound-solid coupling arithmetic,and validates the result in the test.
The polyurethane sealant was prepared through the reaction of hydroxyl-terminated butadiene copolymer(HTPB),bis-hydroxypropyl phenyl aniline (BHA)and toluene diisocyanate(TDI).The effects of the solidifying temperature and the amount of the chain extender BHA on the mechanical properties of the sealant were discussed,…
As a kind of power with features of safe,clean,stable,reliable,good quality and economic.Welding technology and equipment localization,as the guiding process technology of nuclear equipment manufacture,is the key in nuclear power development.Facing opportunities and challenges,we are going to mobilize all recourses an…