Materials Literature
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Single layer HfO2 thin films have been prepared respectively by Electron Beam Evaporation (EBD), Ion Assisted Deposition (IAD) and Ion Beam Reactive Sputtering (IBRS). Crystal structures, optical properties, surface topography and absorption of these deposited films have been studied. It is found that thin film proper…
In this article, we examine the existence of nice arrangements of stars on the American flag. We show that despite the existence of such arrangements for any number of stars from 1 to 100, with the exception of 29, 69 and 87, they are rare as the number of stars increases.
In the durability design of the concrete structures,tide zone was usually considered to be the most crucial area.Based on the chloride transportation mechanism in the drying-wetting cycle,considered the effects of temperature change and the moisture transmission differences in the drying-wetting process,and then built…
Semiconductor luminescent Quantum Dots (QDs) constitute a growing area of research for biological imaging and other biomedical applications. One of the main challenges is to provide QDs with a biocompatible and easy to functionalize surface while retaining the core optical properties. Gelatine is an excellent candidat…
【Objective】Potassium release and kinetics of different K-bearing minerals were studied to provide scientific evidence for reasonable evaluation of K fertility and high efficient utilization of soil potassium.【Method】Different K-bearing minerals(biotite,muscovite,orthoclase and microcline) were extracted successively w…
The increasing development of modern microelectronic technology contributes to a higher demand for packaging materials.However,traditional ones can no longer work well for the modern packaging.A new series of spray deposition high Si-Al alloys developed for electronic packaging have attracted much attention for their…
The research significance and connotation of low carbon manufacturing of metal-forming equipment are expounded.The research is divided into five parts according to its content and the review of literature at home and abroad for each part is carried out.Relevant research routines are made based on the analysis results…
Aiming at cotton/flax blended fabrics,a new automatic identification method based on the longitudinal view of microscopic fiber images is proposed,in which the length of fiber about 0.5 mm is used for image capture.For fiber detection,the background of fiber image is removed firstly,then fiber areas are detected by a…
Co3O4/CeO2 catalyst was prepared by co-precipitation-oxidation method.Adsorption of carbon monoxide and the co-adsorption of CO/O2 over Co3O4/CeO2 sample were investigated.In situ FT-IR analysis of the mechanism in CO oxidation was interpreted over Co3O4/CeO2 sample.Effects of the reaction conditions on the catalytic…
To master the decomposition characteristics of SF6 under different partial discharge(PD) strengths caused by defected insulation in air gap,by use of a constructed physical model of air gap with defected insulation the decomposition experiments of SF6 caused by PD with duration of 96 hours were performed on experiment…
The influences of milling time and process control agents on the preparation of ultrafine nickel powder were studied systematically by granularity test,SEM and XRD.The results show that: with increasing milling time,the nickel powder particle size decreases rapidly at first and then the particle size changes slightly,…
摘要：
The extrusion process of a thin-walled hollow aluminum alloy profile with small features is simulated by using arbitrary Largrang-Euler(ALE) algorithm based HyperXtrude software.The material flow velocity standard deviation in the exit of the die hole is used as a criterion to evaluate velocity uniformity.By designing…
A technical architecture used for the microdetermination of Lymantria dispar multiple-embedded nucleopolyhedrovirus was set up.Based on egt gene of LdMNPV,a pair of primers was designed with the sensitivity of 1fg·mL-1 DNA.By using this pair of primers,the partial sequences of egt gene were amplified from the eggs,lar…
Brittle fracture of composite insulator is a serious malfunction of power system.The mechanism of the brittle fracture of the composite insulator with undamaged sheath was studied in this paper.A stress corrosion test of fiber reinforced plastic rods with silicon rubber(SIR) sheath,and the immersion tests in the prese…
The effect of temperature on CO2 corrosion resistance of Cr13 stainless steel was studied in simulated high temperature and high pressure corrosion environments.By means of SEM and energy spectrum analysis,it was found that the CO2 corrosion rate of Cr13 stainless steel reached maximum at 150℃,but declined as temperat…
As substitute of petrol,bioethanol production from lignocelluloses is one of hot point of research in recent years.A main obstacle of bioethanol production in commercial scale is its cost.One of the most important methods to solve the key problem is raising yield of cellulose hydrolysis by enzyme.However,content and t…
Functionally gradient materials(FGMs) are a new type of inhomogeneous composites,and are under high attention recently because of their excellent structure performances and potential values in application.The deve-lopment course along with the current research status and application of the functionally gradient materi…
OBJECTIVE:To evaluate the efficacy of Huatuo Zaizao Pills for ischemic stroke so as to provide guidance for clinical rational drug use.METHODS: We reviewed the recent literature both at home and abroad about clinical trials on the efficacy and safety of Huatuo Zaizao Pills.The research data were retrieved by 2 review…
Elastic constant and thermodynamic properties of La2Zr2O7 ceramic which are used for thermal barrier coating have been calculated by using the first principle pseudopotential method.These results show that the lattice parameter of optimized crystal structure is 1.0934 nm,and the cell energy is the lowest when the x(po…