Materials Literature
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All the approaches applied now in the field of grounding grid corrosion diagnosis are analyzed,and a theory based on dynamic chaotic PSO is proposed.Such an approach aiming at abnormal topological structure divides the whole grid into regular small parts,and uses circuit theory to construct the equation of diagnosis.A…
To evaluate welded joint defects qualitatively and quantitatively,the signal characteristics of metal magnetic memory(MMM) is investigated by comparing experiments between weld lacking of penetration and weld slag inclusion.The experiments were carried out on DSS-10T-S tension testing machine.Given are the MMM signal…
The fabrication of microlens array based on glass was studied and three factors of glass composition,etching method and mask material that affect the fabrication were introduced.The effects of the three factors were verified by experiments.According to the analysis,microlens array that meet the claims was manufactured…
Objective:To implant bovine jugular vein conduit containing living autologous cells into the canine pulmonary artery and to observe the influence in vivo environment.Methods:Tissue-engineered right ventricular valved conduit was constructed in vitro using the decellularized bovine jugular vein as the scaffolds,the can…
Serial cracks occurred at head when performing hydrostatic test.By using NDE,material analysis and microscope,the macro-surface of the broken head and metallurgical structure,corrosion body were analyzed.The analytical result shows that the major cause of the failure is the stress corrosion due to the combined effect…
Carbonation resistance of concrete is an important part of concrete durability.This paper mainly studies the complex mixed with ex-pansive agent and fly ash on the carbonation resistance of concrete discipline,and analyzes microstructure changes of concrete before and after car-bonation by mercury intrusion analysis,t…
Two photo-active ATRP initiators,4-bromomethylbenzophenone and 4,4′-di(bromomethyl)benzophenone,were selectively synthesized in 91% and 46% yields using urea hydrogen peroxide adduct and aqueous HBr as bromination agents from 4-methylbenzophenone and 4,4′-dimethylbenzophenone,respectively.The structures were confirmed…
High-speed cold roll-beating forming technique is a new near-net plastic forming method with intermittent high-speed roll-beating being used to achieve dynamic impact local loading.It's a complex forming process with high speed,transient state,high impact,and large deformation.Slab method was employed to derive an ana…
Aliphatic polyurethane(PU) and hydroxyapatite(HA) composite scaffolds were prepared by in-situ polymerization and gas self-foaming process.The morphologies and properties of the scaffolds were studied by varying the contents of HA,foaming agent(water) and soft/hard segment ratio and characterized by scanning electron…
FEA is used to study the gasket seals about diesel engine in this paper.To evaluate the seals,the contact press and deformation is simulated by Abaqus.Finally the method to improve the seals is provided.
The effects of Na2CO3 addition on the selective non-catalytic reduction(SNCR) using ammonia solution or urea solution were investigated in a quartz tube reactor.The experimental results show that the addition of a little amount of Na2CO3 can improve the NOx reduction efficiency effectively in the low-temperature regio…
In order to meet the higher requirement of spacecraft stage separation system in installation volume,separation time and synchronization error,a new explosively releasable device with axial length of 64mm,maximum diameter of 16mm has been designed based on SCB(semiconductor bridge)ignition technology.Through connectio…
OBJECTIVE To prepare Pluronic P123 polymeric micelles system loaded with itraconazole(ITZ).METHODS ITZ loaded Pluronic P123 micelles were prepared by thin-film hydration method.The main factors affecting the drug-loading coefficient and encapsulation ratio were studied by single factor analysis and central composite d…
The membranes of sulfonated polyether ether ketone(SPEEK) with the degree of sulfonation(DS) of 48.3%,doped with nanometer cerium oxide(CeO2) were prepared for direct methanol fuel cell application by solution casting technique.The proton conductivity of SPEEK/CeO2 composite membranes increased with the increasing of…
On the basis that the mixture of AEP and MEP was used as flame retardant in ABS resin,a small amount of montmorillonite(MMT) was added as a synergistic agent,and the flame retarded ABS composite ex-hibited excellent flame retardancy,mechanical properties and processing properties.When the mass ratio of AEP,MEP and MMT…
Li_2O-Al_2O_3-SiO_2(LAS) glass-ceramics doped with CeO_2 and Nd_2O_3 were prepared by the meltingcrystallization technique.The effects of Ce~(4+),Nd~(3+) doping on the crystallization behavior,structure and optical properties of the LAS glass-ceramics were studied by differential thermal analysis tester,X-ray diffract…
The effects of temperature and particle size on conversion rate of Si3N4 were studied by TG in which silicon particles of three different size were used,and the products were analyzed using XRD method to acquire the conversion rate curve of nitridation.The results indicated that silicon and nitrogen reacted at 1000～11…
Effects of single aging,duplex aging and retrogression and reaging(RRA) treatments on microstructure and mechanical properties of the Al-Zn-Cu-Mg-Zr alloy containing Sc were studied by means of transmission electron microscopy,tensile test and conductivity measurement.The results show that after duplex aging of 120 ℃×…
This paper aims to present the results of our observation of the diurnal variations of monoterpenes emitted from Pinus tabulaeformis in a smoke chamber.The observational and experimental analysis has been done by us with the gas chromatography for the monoterpene analysis and an ozone analyzer for the ozone concentrat…
An investigation of the wearability of PTT/PLA/Rayon blended fabric tested the strength and hairiness of the ten kinds of PTT/PLA/Rayon blended yarns with different fiber contents,followed by testing the color fastness to dry and wet rubbing,pill resistance,crease recovery,moisture permeability of corresponding ten be…