Materials Literature
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The low carbon bainitic steels gain increasing attention due to their high strength, high toughness,and good weldability.To improve the toughness and weldability of this kind of steel the carbon concentration is usually deduced to below 0.06%(mass fraction).As a result the hardenability of the steel is decreased and t…
An investigation was carried out on the benthic algal communities at 22 sites in the Jinping reach of Yalong River and its main tributaries in May and November 2004,aimed to study the relationships between benthic algal distribution and environmental variables.A total of 150 taxa(mostly to species level)in 37 genera w…
In this paper,the study progress of boron nitride nanotubes is introduced including the structures,physical properties and synthetic methods.Additionally,the prospects for future research are proposed.
The present alginate fiber had poor strength, which limited its application filed. The properties of the fiber were studied such as the morphological structure, crystallinity, physical mechanical properties, moisture property, thermal property, flaming retardance. The alginate fibers are uniform in the diameters and h…
The organic and inorganic component transformation of a mesoporous composite material in preparation process was analyzed based on the infrared spectrograms and X-ray diffraction patterns of raw materials,semifinished products,and end products.The change of components and their rations in the material were educed to j…
To solve the problem that the current model of proton exchange membrane fuel cell(PEMFC) is hard to be used in the design of control systems,a dynamic model of PEMFC was established with Matlab-Simulink,and a fuzzy logic controller(FLC) was designed based on this dynamic model.The combined application of fuzzy control…
Modeling for the multi-winding transformer with low magnetizing impedance,calculation of composite short-circuit impedance and current distribution among parallel multi-branch for multi-winding transformer are three concerned engineering problems which have drawn much attention for a long time.In order to solve these…
The history of the development of metallic system permanent magnetic materials is reviewed.From the directions of magnetism and solid state theory,and based on the differences of crystal structure and the generant mechanism of excellent magnetic properties,the research status of Fe-Cr-Co,rare-earth permanent magnetic…
The real-time calculation and monitoring of transmission lines ice-coating is a new subject.This paper put forward a new real-time calculation and monitoring model and method of transmission lines ice-coating,that is according to the inclination angle of line conductor and the excursion angle of hang insulating string…
According to the dimensionless depth-of-penetration formula for different targets penetrated by rigid projectiles,the present paper theoretically analyses the resistive force which the target exerts on the projectile during penetration.In particular,the impact velocity threshold,which is applicable for the assumption…
Since the shape memory and recovery characteristics of shape memory polymers(SMPs)are realized by a certain thermalmechanical cycling process,the thermomechanical constitutive equations are critical for predicting the deformation and recovery of this class of materials at different constraint conditions.In this study,…
为研究浅水富营养湖泊硅藻季节演替的规律,选择南京两个城市湖泊(前湖和月牙湖)作为对象,对水体硅藻和水质进行逐月采样和实验分析.结合数理统计分析手段,对2006年硅藻浓度、种群组合变化及其与环境因子的关系进行了讨论.结果表明:两湖硅藻都呈现较明显的季节演替特点,冬季浮游硅藻组合主要由Cyclostephanos的种类为主,代表了冷水富营养种组合类型;夏季和秋季以Cyclotella atomus和C.meneghiniana暖水耐营养种优势组合为主.硅藻和环境指标月富营养湖泊,春季硅藻丰度增加对初级生产量的贡献很小;随着营养程度的不断提高,温度对浮游硅藻的限制更为突出.;For exploring the seasonal succ…
The geopolymer mortars were prepared using four dosages of re-dispersible polymer emulsion powder(polymer powder)and the geopolymers matrix.The effects of the different dosages of the polymer powder and matrix types on the flexural strength and toughness of the geopolymer mortar were investigated.The results indicate…
Mg-AZ31 based composites with 20%(volume fraction) and 40% Ti particles were fabricated by friction stir processing(FSP).The results show that after four FSP passes the matrix structure of composite layers can be significantly refined within 3-5 μm obviously,and the fragments of the Ti particles are about 200 nm.The T…
ZnHZSM-5 catalysts with different Zn loading were prepared by impregnation,and characterized by means of XRD,BET,NH3-TPD and Py-IR.The effects of Zn content and reaction parameters on the conversion of methanol to aromatics were investigated in a fixed-bed down-flow reactor.The results showed: The yield of aromatics i…
A dermal equivalent applied in the treatment of scalds has been attracting much attention.We report here the fabrication of a bilayer dermal equivalent(BDE) composed of collagen-sulfonated carboxymethyl chitosan(SCC) porous scaffold and silicone membrane,and its application for accelerating the healing of skin scalds…
The effect of additives in molten salt on the ion exchange and strengthening of float glass was investigated in the commercial purity KNO3 or the mixtures of KNO3 with the addition of KOH,K3PO4,K2CO3,K2SiO3 and Al2O3,respectively.Potassium concentration profiles of glass were measured by electron probe micro-analysis.…
The features of several kinds of commonly used radar absorbing material structures are compared under high-temperature environment, and it is confirmed that the ceramic matrix composites are the most ideal radar absorbing material structure for high-temperature applications. The dielectric properties of the constituen…
The operation condition of line-start permanent magnet synchronous motor(PMSM) varies frequently,and its losses change correspondingly.In order to investigate the main factor which affects losses and its variation,Time-Stepping Finite Element Method(T-S FEM) was employed to calculate the loss density in different part…
Alloy Ti-1023 is a kind of forging titanium alloy with high structural efficiency,high reliability and low manufacturing costs,which is developed especially for damage tolerant design.In this paper,the microstructure,mechanical property,process property and application of Ti-1023 titanium alloy is introduced.