化学合成法制备ZnS基纳米荧光粉研究

描述了一种生产ZnS:M[M=Mn,Cu,Cu(Al)]纳米荧光粉的化学合成方法.运用本方法通过调节巯基乙酸与甲基丙烯酸的摩尔比,可在1.8～3.0nm范围内控制纳米粒子的尺寸.选择面积的电子衍射和X射线衍射证明ZnS:M纳米荧光粉具有闪锌矿结构.透射电镜图像表明ZnS:M纳米荧光粉具有较好的尺寸分布.ZnS:Mn的PL谱表明纳米尺寸的ZnS:Mn与体材料相比具有较高的发光效率。     

Al2O3/Ni包裹粉体的制备、烧结行为及其显微结构研究

利用非均相沉淀包裹技术,在铝无机盐溶液中制备出氧化铝前驱体包裹纳米镍颗粒的复合粉体,并通过能量发射能谱（EDS）以及俄歇电子能谱（AES）研究包裹粉体的成分构成,发现镍纳米颗料表面均匀地包裹一层氧化铝的前驱体。燃烧后的包裹粉体在氩气氛中进行热压烧结。结果表明,与溶胶－凝胶法制备的粉体相比,包裹粉体可以在较低的温度下达到致密化,烧结后的材料其显微结构明显不同于环磨粉体烧成的材料,否认在氧化铝晶界或晶内,镍颗粒与氧化铝之间都有孔隙,这是由于镍的热膨胀系数与氧化铝的热膨胀系数大引起的,Al2O3/Ni复合材料的断裂方式以及沿晶断裂为主。     

Kinetics of orthorhombic martensite decomposition in TC21 alloy under isothermal conditions

The kinetics of martensite decomposition in TC21 alloy was investigated at isothermal conditions in the temperature range 500–850 °C. The dilatometry technique was utilized to trace the transformation process for different aging temperatures. Within the framework of the Avrami theory, the analysis of the experimental data was made by means of the Johnson–Mehl–Avrami (JMA) equation. A very good correspondence between the calculated and the experimental results was found. The JMA kinetic parameters obtained from different aging temperatures implied different mechanisms of the transformation. The α″ phase transforms to α + α″ (rich) at 500 °C and the transformation is incomplete. Further increase of the temperature to 800 and 850 °C results in directly transformation α″ →α + β. The mechanism of the transformation alters during the course of the transformation for 550, 600, 650, 700, and 750 °C. Moreover, The TTT diagram was constructed for the martensite decomposition in TC21 alloy based on the dilatometry analysis and JMA theory, respectively. Good agreement between experimental and calculated TTT diagram is observed.     

家用小型漏电保护开关电性能试验自动操作装置的设计与应用

随着社会的发展，家用小型漏电保护开关应用越来越多，它关系到人身和设备的操作安全，因此，对它进行性能检测显得相当重要。文章对漏电保护开关的工作原理和电性能试验的标准要求进行研究，设计并实现了一套基于PLC的小型漏电断路器机械和电寿命试验自动操作装置，它具有三个工位同时运行的能力，操作简单、功能完善、运行稳定可靠等特点，实现自动操作以替代人工操作，大大节省了人力成本，极大提高了小型漏电断路器的机械和电寿命性能试验的检测效率，使检测技术更加科学、公正。     

Al-P复合中间合金及其对Al-Si合金的变质处理

制出一种新型的Al-P复合中间合金变质剂,并探讨了它对共晶铝硅合金的变质效果.实验结果表明:Al-P复合中间合金变质剂对共晶铝硅合金有显著的细化作用,改善了共晶铝硅合金的显微组织、变质持续时间长,显示出良好的应用前景.     

电磁搅拌对镁合金半固态组织的影响及机理

研究了电磁搅拌工艺对镁合金半固态组织的影响及机理.结果表明:电磁搅拌改变了合金的形核和生长条件,使镁合金AZ91D初生相由枝晶状变为球团状.研究还表明:搅拌引起的枝晶熟化、机械碰撞冲刷作用以及合并生长是镁合金半固态组织形成的主要机制.     

试论社会主义市场经济的社会协调机制

在转轨时期的经济中 ,要解决那些市场和政府解决不了或解决不好的社会和经济问题 ,必须在市场调节与政府调控之外 ,建立和完善社会协调机制。只有当社会协调与市场调节和政府调控同时并用、相互配合、各司其责并充分发挥作用时 ,社会主义市场经济才会健康、高效、快速地发展     

Fast SAR Imaging Algorithm for FLGPR

A fast SAR imaging algorithm for nearfield subsurface forward-looking ground penetrating radar （FLGPR） is presented. By using nonstationary convolution filter, the refocused image spectrum can be reconstructed directly from the baekseattered signal spectrum of target area. The experimental results show the proposed method can fast achieve image refocusing. Also it has higher computational efficiency than the phase-shift migration approach and the delay-and-sum （DAS） approach.     

Transition of solidification path in nonequilibrium solidification of Ti–48Al–8Nb alloy

The solidification behavior of Ti-48Al-8Nb alloy under nonequilibrium solidification conditions was studied by electromagnetic levitation technique.The solidification conditions are different undercooling(△T)under the same cooling condition and different cooling methods at the same undercooling condition,respectively.In different undercooling conditions,when the undercooling is above a critical value(△T*≈211K),a remarkable morphological transition from typical hypoperitectic solidification to a sole solidification of the(3 phase resulting in the suppression of the peritectic reaction occurs.For melts with different cooling conditions at the same undercooling(△T≈85 K),the melt was rapidly cooled by quenching them in cooling media.With cooling rate increasing,a transition from β phase to peritectic α phase solidification mode is revealed for Ti-48Al-8Nb alloy.     

一种基于视觉特性的图像盲去模糊方法

In many various image-debluring methods, Visual Characteristics are not consides. This paper proposes an image-dehluring method based on the frequency and direction characteristics of human visual system by weighting high frequency subband of blured image‘s wavelet transformation, the enhanced blured image in high frequecy is ob-tained through wavelet anti-transformation ,and the blind deblured methed is used to restore image from the enhanced blured image .the restored imat, e is well improved in visual quality.