查询词典 micro-climate

This project studies the scale-dependent deformation behavior of the metal matrix composite, the void nucleation and void growth mechanisms at the micron/submicron scale. The main results are:(1) In prophase, growth and coalescence of the void embedded in the graded matrix are analyzed in detailed;(2) Based on the infinite solid model containing a micro-void, coupling effects of the void shape and the void size on the void growth are studied carefully, the results show that it seems to exist a critical equivalent void radius, which is associated with the material length. When radius of a microvoid is close to or smaller than the critical void radius, the micro-void growth rate is essentially eliminated;(3) The coupling effects of the particle shape and size on the mesoscopic stress fields within the particle and matrix are also investigated by introducing the conception of inclusion/matrix interfacial energy. The results show that the stress concentration factors within the particle and on the matrix/particle interface are also strongly size-dependent,so the void nucleation mechanism is size-dependent.(4) By employing a specific orthogonal curve coordinate frame and a 'kernel function' conception, a 'unified method'solving the spheriodal and spherical void problems is suggested; by this unified method, size-dependent plastic potentials of the porous materials containing the spheriodal or spherical voids are obtained, which extend the traditional Gurson model for the spherical void and GLD model for the spheriodal voids to the micron scale.(5) Based on the RVE model containing the spheriodal or spherical particles, the influences of the particle shape and size on the size-dependent mechanical behavior of metal matrix composite are studied.

中文摘要：本项目对金属基复合材料在微细观尺度下的尺度相关变形行为、孔洞形核及长大的机理和模型进行了研究，取得了如下主要结果：1）在前期研究中，探讨了基体的梯度分布对孔洞长大和聚合的影响；2）基于含孔洞的无限大体模型，探讨了孔洞形状和孔洞尺寸对其长大的耦合作用，结果表明：可能存在一个与材料特征长度相关的临界孔洞尺寸，当椭球孔洞的等效半径小于临界孔洞半径时，孔洞的长大受到明显抑制；3）通过引入基体/夹杂界面能的概念，分析了夹杂尺寸、夹杂形状对材料细观应力场的耦合影响，结果表明：颗粒内部和界面上的应力集中因子强烈地依赖于夹杂的尺寸和形状，因此，孔洞的形核机理是尺寸相关的；4）采用一种特殊的正交曲线坐标系和引入"核函数"的概念，"统一"地得到了含椭球和球形孔洞的材料的尺寸相关塑性势，它将传统的Gurson球形孔洞模型和GLD椭球孔洞模型推广到微尺度范围；5）基于含椭球和球形夹杂的体胞模型，初步研究了夹杂形状、夹杂尺寸对金属基复合材料尺寸相关力学行为的影响。

He is the current technique-assistance expert in Innovation and Practice Base for Graduates in the Graduate Institute of Chongqing University, director of Chongqing University-American Texas Instrument Digital Signal Processing Lab and Chongqing University-American Micro-chip Company PIC Chip Micro-computer Lab.

现为重庆大学研究生院研究生创新实践基地技术支持专家，重庆大学-美国德州仪器数字信号处理方案实验室和重庆大学-美国微芯公司PIC单片机实验室的实验室主任。

Micro-ecology is a branch of life sciences which studies the relationship between the normal micro-organism group and its host.

微生态学是研究正常微生物群与其宿主相互关系的生命科学分支。

Micromanipulation system has wide prospect in micro parts assembly, micro surgery, cell manipulation and optical fiber alignment.

微操作机器人系统在微型零件装配、微型外科手术、细胞操作及光纤对接等领域具有广泛的应用前景。

This paper studies the parallel micromanipulator of cell micro-injection , focusing on the application field of the cell micro-injection manipulate and composed the characteristics of the parallel micromanipulator.

本论文针对生物工程中细胞注射微操作这一应用领域，结合微动并联机器人的特点，进行了微注射操作并联机器人机构的研究。

It is much more important to improve combustion efficiency and stability of the micro-combustor by improving the uniformity of flow distribution and mixed results in micro premixing chamber.

通过提高微型预混腔内流动的分布均匀性和混合效果来提高微型燃烧器的燃烧效率和稳定性显得更为重要。

So, polymer melt filling flow behaviors in microscale in special microscale effectswere researched, and distributions of temperature, pressure and velocity, etc. were gained. Onthis basis, numerical simulations were carried out and molding process experiments werestudied, all of which are momentously theoretical and practical significance on optimizationdesign of micro injection mold and on improving the quality of micro plastic part.

因此，对微尺度下熔体充模流动行为尤其对微尺度效应进行深入研究，获得微小型腔内熔体的温度、压力及速度场，在此基础上进行数值模拟与成型工艺试验，对设计优化微注塑模具、合理设置成型工艺参数和提高微塑件质量都具有重要的理论意义和实用价值。

For the same material, the quality of femtosecond laser micro-processing is much better than that of nanosecond laser micro-processing.

对于同样的材料，飞秒激光加工的质量明显优于皮秒、纳秒激光加工的质量。

The Company is a professional micro-bearings manufacturers, the main production diameter of 1-15 mm, diameter 30 mm below the metric system, English, flange series bearings, stainless steel bearings, ball bearings thrust plane, and other micro-bearings, and Acting NMB import sales in Japan bearing, but also according to customer-made various non-standard bearings.

本公司是微型轴承专业制造商，主要生产内径1－15mm、外径30mm以下的公制、英制、法兰系列轴承，不锈钢轴承，平面推力球轴承等各类微型轴承，并代理销售日本NMB进口轴承，还可根据客户要求订做各类非标轴承。

A new kind of micro force sensor was discussed,which has the capability of simultaneously measuring micro friction and corresponding normal force.

论述了一种新的应用于微摩擦测试的微力传感器，这种微力传感器能同时测定微小摩擦力及相应正压力的大小，其独特的悬臂结构消除了多维力传感器普遍关注的耦合问题。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。