Materials Literature
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The process of spur gear warm forging was simulated with different factors and different levels chosen in the orthogonal experiment.Based on the forming force and the value of die wear,rationalized technological parameters were obtained including initial temperature of blank,preheat temperature of die,the friction coe…
To disclose the heat conduction property of woody composite mat,quasi steady state method was applied to test the heat conduction coefficient(HCC) of wood fiber and rice straw particle motrice with 10 % liquid urea formaldehyde(UF) resin based on oven-dry fiber or particle at room temperature in this paper.Influences…
Graft copolymerization of zymolytic starch with styrene(St) and butyl acrylate(BA) was carried out via soap-free emulsion polymerization with ammonium persulfate(APS) as initiator.The effect of starch and monomers ratios,amount of ammonium persulfate,monomer ratios and reaction temperature on grafting reaction were in…
This overview discusses the development of polyimide fiber both at home and abroad,the current status of the industry,and basic properties such as high temperature,radiation and solvent resistance,high strength,high modulus,and flame retardance with focus on its inherent flame retardance,including the limited oxygen i…
A combination of direct mixing combustion and lean premixed prevaporized(LPP) single-module tubular combustor was designed.Numerical investigation of the combustor was conducted with software fluent.The results show that main flame zone is independent from pilot flame zone;pilot module operates as a direct mixing flam…
The purpose of this paper is to identify the effects of toluene and the toluene content which is at different initial temperatures on the ignition delay time of diesel surrogate fuel under homogeneous charge compression ignition(HCCI) engine condition.The CHEMKIN4.1 module(closed homogeneous batch reactor) is used wit…
According to the rural domestic pollution status of the scenic spots of Yihe river source,the key links,including source reducing,process reusing and end recycling,for rural domestic pollution control were proposed based on the 3R principles of circular economy.The controlcounter measures of different links for differ…
This article presents the applications of the following physicochemical methods:SEM,XRD,DSC,NMR and so on in the fields of modified starch research concerning structure,gelatinization,retrogradation and emulsifying capacity.
A series of ammonia-modified multi-walled carbon nanotubes was prepared via hydrothermal method.Their catalytic activity was evaluated by oxalic acid degradation in aqueous solution in the presence of ozone.It was found that the reaction process can be fitted to zero-order reaction kinetics.The apparent zero-order rat…
Low NO-Smoke emission with oxygen-enriched combustion is achieved with a commercial turbocharged inter-cooled direct injection diesel engine using oxygen-enriched intake air and high rate EGR.An operating regime was identified in which NO increased dramatically when increasing oxygen concentration without optimization…
The effects of exhaust gas temperature,flow velocity and urea solution injection rate on deposit formation were investigated through diesel engine bench test.The inner wall temperature of exhaust pipe was measured and compared with the exhaust gas temperature.The decomposition of deposits formed in durability test and…
The synthetic conditions of super absorbent resin from Canna edulis Ker starch and acrylic acid under microwave irradiation were studied.Based on single factor test,response surface methodology(RSM) was applied to investigate the effects of ratios of acrylic acid to starch,dose of initiator,neutralization ratio of acr…
The activity of MnOx/γ-Al2O3,FeOx/γ-Al2O3 and CuOx/γ-Al2O3 catalysts for toluene oxidation was investigated in a dielectric barrier discharge reactor.The catalysts were prepared by impregnation method,and then characterized with X-ray diffraction(XRD) and temperature programmed reduction by H2(H2-TPR).Results showed t…
The electron accumulation and transfer process at the nano/micro-scale bilayer structure of TiO2 film were investigated by electrochemical impedance spectroscopy(EIS).Two kinds of films with different microstructures were prepared through adding a micro-scale TiO2 layer at the top of the nano-scale monolayer TiO2 film…
2,4-dihydorxybenzophenone photosensitizer(UVA) and triazine-stilbene fluorescent brighteners(FBs) were synthesized by nucleophilicity method with 2,4,6-trichloro-1,3,5-triazine and taurine as raw materials.The mixtures of FBs and UVA were used as a yellowing inhibitor and applied to the hand sheet of chemi-mechanical…
A field experiment was performed to investigate the effects of the chemical regulation of PASP-KT-NAA(PKN)on leaf senescence physiology and grain filling rate under different temperatures.The result showed that the activities of superoxide dismutase(SOD),peroxidase(POD),catalase(CAT),chlorophyll concentration in ear l…
The research and application level of high strength β titanium alloys of the United States,Russia and China were explained.The problems in β titanium alloy used as high strength type structure material and future trends in high-strength research were proposed.
Machining tests and grading of non-metallic inclusions were carried out on eight heats of free-cutting steel.The results show that no matter whether the steels contained Sn for easy machining,the machinability is deteriorated dramatically with the increase of the grade of oxide inclusions,especially B-type inclusions…
Research advances in the formation and growth mechanism of interfacial IMC between the Sn-based solder and Cu substrate in interconnection solder joint of electronic packaging are reviewed and commented.The formation and growth behavior of interfacial IMC in lead-free solder joints,the thermodynamics of IMC formation…
The epoxy resins were modified by core-shell polymer(CSP) particles.The effect of CSP on the coefficient of thermal expansion(CTE) of modified epoxy resins was investigated by infrared spectroscopy,thermal mechanical analysis and scanning electron microscopy.The results showed that hydrogen bond was formed between C=…