α-Tocopherol alteration of soybean antiherbivory toTrichoplusia ni larvae

The antioxidant vitamin E, -tocopherol, was tested as a candidate elicitor of alterable antiherbivory in soybean plants against cabbage looper larvae. Although a nonspecific antioxidant, vitamin E proved elicitory to the involved sulfhydryl-dependent receptor-energy transducer protein in soybean plasma membrane. Effects of -tocopherol were dependent on dosage, time, and space in the plant. The observed elicited effects were all decreases in herbivory. The best negative phytochemical correlate of looper feeding was the percentage of increased total HPLC peak area of extractables from elicited as compared to nonelicited leaves. Some specific compounds, e.g., glyceollins, were quantitatively major components of the total profile of secondary metabolites.     

Formation of aluminum-magnesium alloy cup by hydrodynamic deep drawing with twin-loading paths

In order to overcome the limitation of hydro-rim deep drawing, a new process of hydrodynamic deep drawing (HDD) with independent radial hydraulic pressure was proposed. By employing the dynamic explicit analytical software ETA/Dynaform5.5 which is based on LS-DYNA3D, the effects of independent radial hydraulic pressure on the stress, strain and the sheet-thickness of aluminum-magnesium cylindrical cup with a hemispherical bottom were analyzed by numerical simulation. The feature of stress distribution is that there exists a stress-dividing circle in the flange, and the radius of dividing circle was determined by theoretical analysis and stimulation. The experimental results indicate that the reasonable match of independent radial hydraulic pressure and liquid chamber pressure can effectively reduce the thinning at the bottom of hemisphere, decrease the radial stress-strain, and improve the drawing limit of aluminum-magnesium alloy cylindrical cup. Funded by the National Natural Science Foundation of China (Nos.50525516, 50875062)     

State feedback control of continuous-time T-S fuzzy systems via switched fuzzy controllers

This paper studies the problem of state feedback control of continuous-time T-S fuzzy systems. Switched fuzzy controllers are exploited in the control design, which are switched based on the values of membership functions, and the control scheme is an extension of the parallel distributed compensation (PDC) scheme. Sufficient conditions for designing switched state feedback controllers are obtained with meeting an H_∞ norm bound requirement and quadratic D stability constraints. It is shown that the new control design method provides less conservative results than the corresponding ones via the parallel distributed compensation (PDC) scheme. A numerical example is given to illustrate the effectiveness of the proposed method.     

基于MCX314as的运动控制器设计

文章介绍了用C8051F120单片机和MCX314as组成运动控制器的方案.该方案应用存储器扩展的方法为运动控制芯片MCX314as和液晶显示模块MT22G06B的内部寄存器分配地址空间.从而实现C8051F120单片机对运动控制芯片和液晶模块的控制作用.文章还给出了MCX314和MT22G06B的驱动程序架构.     

General linear methods for ordinary differential equations

General linear methods were introduced as the natural generalizations of the classical Runge–Kutta and linear multistep methods. They have potential applications, especially for stiff problems. This paper discusses stiffness and emphasises the need for efficient implicit methods for the solution of stiff problems. In this context, a survey of general linear methods is presented, including recent results on methods with the inherent RK stability property.     

一种新型非接触圆盘压电微电机

提出了一种新型圆盘压电微电机，定子与转子间是非接触型的。定子工作在砘振动模态，并激励定子产生圆周方向单向行波。该电动机具有结构简单、易于制作、转速高等特点，电动机测试最高转速达到2225r／min。     

Effect of soft‐storey mechanism caused by infill elimination on displacement demand in nonlinear static procedure using coefficient method

In recent earthquakes, many buildings have been damaged due to the soft‐storey mechanism failure. The seismic design codes for buildings do not contain enough criteria to predict the real displacement of such buildings. This paper focuses on evaluating the nonlinear displacement of buildings that fail in soft‐storey mechanism form. Results show that the nonlinear static procedure with coefficient method, which is described in Chapter 3 of ASCE/SEI 41‐06, does not have sufficient accuracy for estimation of structure displacement demand in such buildings. In this paper, the coefficient methodology is used for evaluating the target displacement for 5‐storey, 8‐storey and 15‐storey special moment resisting steel frames. For this purpose, dynamic nonlinear time‐history analysis has been applied for the mentioned structures having a soft‐storey mechanism failure form. The numerical results of storey displacement and interstorey drift were compared with those values obtained from the coefficient method described in Chapter 3 of ASCE/SEI 41‐06. Copyright © 2012 John Wiley & Sons, Ltd.     

5A06电子束焊接Mg元素烧损规律及对接头力学性能的影响

研究了5A06合金电子束焊接时,熔池内Mg元素的分布规律以及Mg元素烧损对焊接力学性能的影响。结果表明：在接头区域,越靠近热影响区的Mg元素烧损程度越低;随着焊缝深度的增加。Mg无素烧损程度减小,同时显微硬度增大,烧损程度越严重的试样显微硬度越低。     

柿竹园萤石浮选捕收剂的研究

采用新型H06捕收剂从柿竹园浮钨尾矿中浮选回收萤石,分选效率达61%,比油酸高24%以上。文章探讨了H06的物化性能及其对萤石的捕收作用。H06具有选择性吸附力强、耐低温、化学稳定性优良等特点,对柿竹园矿石性质有很好的适应性。     

06Cr13换热钢管与06Cr19Ni10管板焊材选择试验研究

使用ER316L、ER309L及ERNiCr-3焊丝对06Cr13换热钢管与06Cr19Ni10管板进行平缝GTAW管头自动焊接,通过PT、Leica显微镜和维氏硬度等方法检测,06Cr13换热钢管与06Cr19Ni10管板使用ER316L焊丝进行焊接时,焊缝没有裂纹,组织性能最优,说明试验所选焊接工艺参数是合理的,ERNiCr-3焊丝焊后试件存在裂纹,试验不合格。