Materials Literature
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In order to accurately predict the temperature field of rolled pieces,optimize the hot rolling process and improve the quality of the final product,the finite element temperature model of 3104 aluminum alloy plate during single pass hot rollig process was built up using MSC,Marc softwares by rolling test and two-dimen…
The reason of cracking on surface of 20CrMnMo carburized heavy-duty gear was analyzed by SEM and optical metalloscope.The failure mechanism was also discussed.The results show that the microstructure of the quenched steel is coarse acicular martensite,which resulted in brittle fracture of the gear with intergranular c…
The numerical simulation of temperature field and stress field during the solidification of HT250 stress frame casting was carried out by using of the professional casting simulation software—ProCAST, with three different pouring temperatures and three different shakeout temperatures, respectively. The residual stress…
High-strength and high-conductivity Cu-Ag alloys is a kind of functional materials with great physical and mechanical properties,which have high strength coupled with good conductivity.The present research on the structure,fabrication technology,strengthening and conducting mechanisms is reviewed,the development prosp…
The equilibrium solubility of the ternary system KClNH4Cl-H2O were determined at 25 ℃ and the corresponding phase diagram was constructed.The two kinds of solid solutions of mNH4Cl·KCl and NH4Cl·nKCl were prepared by a method of constant-cooling-rate and characterized by XRD,FTIR and SEM,and the corresponding cell par…
Thunder-struck failure is one of the important causes of over-head power transmission lines accidents. Here through modeling the lightning over-voltage simulation of transmission line with ATP-EMTP, the lighting withstanding level of an lightning-stroked tower is analyzed, and the circumstance of lightning area is stu…
In this paper,an initial state learning principle is proposed for non-affine nolinear system and the sufficient condition for convergence is put forward.The learning pirnciple will not fix the initial cndition on the expected condition or fix the initial condition on the speciific condition at the beginning of each it…
Dark feature is important for each performance of polycrystal diamond film. Twin mechanism on dark feature was established. The simulation basic assumption that penetration twin were formed on diamond face with deposition temperature changed and were grown with initial grains as α2d. Dark features were formed at grain…
Aiming at solving the problems of some traditional cluster methods,an improved cluster method based on bi-swarm particle swarm optimization(PSO) algorithm with exchanging particles strategy was proposed.One swarm dynamically updated its inertia weight by a new nonlinear updating formula,and the other employed a consta…
A series of Ni/MgO/Al2 O3 catalysts were prepared by the method of co-impregnating boehmite ( AlOOH) and characterized using N2 adsorption and X-ray diffraction( XRD) . 1-Methylnaphthalene was selected as a tar compound to investigate the performance of the Ni/MgO/Al2O3 catalysts for converting tar from hot coke oven…
Crater radius is one of the important design parameters for the penetration in concrete target by shaped charge jet.Each stage of penetration into concrete by jet was analyzed in detail.According to characteristics of radial crater growth for penetration into concrete by shaped charge jet,the crater growth process was…
The most abundant biomacromolecule,cellulose has attracted considerable attention in recent years due to its biodegradable,biocompatible and renewable characters.the grafting polymerization is one of the important modification of the cellulose.The solid phase grafting of maleic an hydride(MAH)onto microcrystalline cel…
The pulverous cationic terpolymers P(AM/DMC/DMDAAC) were prepared by aqueous solution copolymerization with acrylamide(AM),(2-methacryloyloxyethyl) trimethylammonium chloride(DMC) and dimethyldiallylammonium chloride(DMDAAC) as the raw materials.The cationic copolymers were characterized by means of Fourier Transform…
The paper introduces the current situation of ultra supercritical(USC)unit construction,evaluates developing technical level from the following aspects:main equipment parameters,design and manufacture capability,systematic design level,analyzes existing problems and their causes,and puts forward comments for further d…
Objective To observe the protection of neuron nutrition active peptide(NNAP) on the Parkinson′s disease(PD) rats and its effect on the microglias.Methods 6-Hydroxydopamine(6-OHDA) was used to prepare the PD rat model.Further,the effects of NNAP on the rotation behavior and the immunoreactivity of substantial nigra dop…
YAG laser welding was used to join TiNi shape memory alloy thin wires with pure Cu as interlayer.The microstructural charactertics were investigated by means of optical microscopy,scanning electronic microscopy and micro-XRD et al.The tensile and bending tests were carried out to examine the mechanical properties and…
The pyrolytic gas chromatography,Fourier transform infrared spectrometry and thermogravimetric analysis were carried on to determine the ingredient of scrap rubber powder,and the conjugated three-component polyurethane /polystyrene /scrap rubber powder semi-interpenetrating polymer networks was prepared to test the me…
The well dispersed twin spherical CaCO3 particles with granular size of 1.5—3.0 μm and a ratio of length to brachyaxis about 2:1 were prepared directly via a liquid mixing precipitation method in the presence of trisodium citrate,using calcium acetate and sodium calcium solution as raw materials.The obtained CaCO3 sam…
In this study,a super-hydrophobic surface of bamboo,coupled with 30-80 nm nanorod arrays and a network of nanowire coating,was prepared via chemical vapor deposition at room temperature and atmospheric pressure,with methyl trichlorosilane as raw material.Results show that the maximum water contact angle of the super-h…
Microstructural changes of C/C composites after braking test were studied by TEM,RMS,SEM and so on.Microstructural model of worn surface layer was established.Temperature fields of specimens with asperities were simulated by Finite Element Method(FEM).The results show that a friction layer with several microns forms o…