一句话、一个人和一本书影响了我

Q=你应该从大二就开始了兼职设计工作。当初什么样的机会让你和设计有了实践上的接轨？当时的你最希望从实践中获得的东西是什么？后来到底得到了怎样的收获？A——我初次参与设计兼职工作是在大二时的暑假。一个偶然的机会．有朋友介绍我与其他两位同学与几家展览公司进行一些接触。当时是上海会展行业初步呈现规模、开始发展壮大的时期．有些展示公司由于业务繁忙，需要一些勤奋肯干的兼职学生参与设计，于是就有机会开始了最初的实践。后来也逐渐接触了另几家会展公司,参与了更多的展示设计工作，可以说基本上在大学的设计实践绎聆伞部来自干展示展览设计．     

压电材料中反平面渗透裂纹的解

用复变函数的保角映射法,采用可渗透边界条件,研究了含裂纹的无限大压电材料在平面内电场和反平面荷载作用下的耦合场,得到了精确的解和场强度因子以及能量释放率。结果表明,电场强度在裂尖没有奇异性,应变、应力、电位移具有1/2阶的奇异性,能量释放率总是正的。     

A Noise-Tolerant Hybrid Model of A Global and A Local Learning Module

Proposed is GLLL2, a hybrid architecture of a global and a local learning module, which learns default and exceptional knowledge respectively from noisy examples. The global learning module, which is a feedforward neural network, captures global trends gradually, while the local learning module stores local exceptions quickly. The latter module distinguishes noise from exceptions, and learns only exceptions, which makes GLLL2 noise-tolerant. The results of experiments show the process in which training examples are formed into default and exceptional knowledge, and demonstrate that the predictive accuracy, the space efficiency, and the training efficiency of GLLL2 is higher than those of each individual module.

     

GENERATING A LAYOUT FROM A DESIGN SKELETON

In the past, researchers have proposed several types of design skeletons from which a human designer can generate good facilities layouts. Examples are flow graphs, SLP space relationships, bubble diagrams, planar adjacency graphs, matching based adjacency graphs, centroid locations, and cut trees. In this paper, we introduce a linear programming model which efficiently generates a layout from a graphical representation of any design skeleton. We demonstrate how the model can be used to enhance most design skeleton based layout approaches.     

A switched-capacitor successive-approximation A/D converter

A switched-capacitor successive-approximation analog-to-digital (A/D) converter that incorporates a serial digital-to-analog (D/A) subconverter for generating the threshold voltage sequence is developed. The conversion process is insensitive to parasitic capacitances and offset voltages of the comparator and operational amplifiers. Error analyses and Spice simulations show that a resolution higher than 11 b, a sampling rate up to 440 ksamples/s with 10-b resolution, and a power consumption less than 60 mW are attainable with monolithic implementation using present CMOS technologies. The required chip area is small because of a low device count. The architecture described is therefore best suited for high-accuracy, medium-speed A/D converters in application-specific integrated circuits (ASICs). A prototype converter breadboarded using discrete components has confirmed the principles of operation     

A GENERALIZED CONCEPT OF A FATIGUE THRESHOLD

Abstract— The conditions for non-propagating LEFM type fatigue cracks were investigated on an Inconel, 617 Alloy in the range of K _max between 10 and 50 MPa m^1/2 under four different types of fatigue loading conditions. In all tests, K _max was held constant during the fatigue cycling prior to determining the non-propagation condition. It was found that with decreasing range of applied K the fatigue tolerance range Δ K _{eff, th} increases. Furthermore, there is slight increase of Δ K _eff,th with decreasing K _max of approximately 20–30% when K _max is decreased from 50 to 10 MPa m^1/2. The results of the four types of tests are considered in respect to the damage in the near-region of the crack front, i.e. increasing K _max increases the damage zone and therefore decreases the fatigue tolerance range Δ K _eff,th.     

A Development of A Computer aided Ferrographic System

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A／D非线性的一种修正方法

本文提出了一种Ａ／Ｄ非线性的修正方法。通过引入非线性ＡＤＣ，不仅易于集成电路的实现，而且能够得到高精度、高速度，同时，还可实现智能输出。     

A CAPACITY PLANNING MODEL FOR A MULTI-PRODUCT FACILITY

A deterministic capacity planning model for a multi-product facility is analyzed to determine (he sizes to be expanded (or disposed of) in each period so as to supply the known demand for N products on time and to minimize the total cost incurred over a finite planning horizon of T periods. The model assumes that each capacity unit of the facility simultaneously serves a prespecified number of demand units of each product, that costs considered include capacity expansion costs, capacity disposal costs, and excess (idle) capacity holding costs, and all the associated cost functions are nondecreasing and concave, and that backlogging is not allowed. The structure of an optimal solution is characterized and then used in developing an efficient dynamic programming algorithm that finds optimal capacity planning policies. The required computational effort is a polynomial function of N and T.     

Linear and Nonlinear A/D, D/A, A/A Conversions Using the Dual-Slope Principle

New methods for precise linear and nonlinear A/D, A/A, and D/A transformations, based on the principle of the dual-slope conversion are proposed. These methods enable multiplication, exponential and logarithmic conversion, determination of nth roots, and the solution of polynomial equations to be performed during the conversion cycle.     

新型表面可修饰性有机硅密封材料的制备及应用

制备了一种单组分室温硫化表面可修饰性有机硅密封材料。在通用的酮肟型有机硅密封材料组分中,添加自制的含有氰基、仲胺基的硅烷改性剂,可明显改善油溶性醇酸漆和聚氨酯漆对有机硅密封材料的可涂覆性及储存稳定性。添加甲基丙烯酰丙基三甲氧基硅烷,同时在水溶性丙烯酸乳胶漆中添加适量的硅丙乳胶,可显著改善水性丙烯酸乳胶漆对有机硅密封材料的表面可修饰性。表面可修饰性有机硅密封材料可用作普通有机硅密封胶的底涂。     

A DISCUSSION ON A CRITERION FOR THE CHOICE BETWEEN MANUFACTURING ON A POSITIONALLY CONTROLLED MILLING MACHINE AND A CONVENTIONAL MACHINE

To avoid the labour involved in ad hoc comparisons between numerically controlled positional machines and conventional machines, the authors outline a procedure which would assist in making an economic selection between these machines when considering the manufacture of a suitable component. Three principal criteria are considered, viz., the total number of com-ponents to be manufactured, the number of batches, and the complexity of the component. Formulae are derived on these bases to speed decision-making. Complexity is defined in terms of accuracy and the number of changes in the direction of the cutter, and a method of combining these is described.     

美能达Capios160A和Capios140A

美能达公司推出的Capios160A和Capios140A两款变焦相机,最大的特点是设置了公司最新开发的“可视动感AF”(AREA-AF)。     

A FRACTOGRAPHIC RECONSTITUTION OF A FATIGUE CRACK FRONT

Abstract— A hypothesis on the statistical relation between the local microscopic directions of fatigue crack growth and the macroscopic crack front shape is postulated. The method of fractographic reconstitution of the fatigue crack front shape from local microscopic directions of crack growth is proposed and tested in two different applications.     

A 100 A, 100 kHz transconductance amplifier

A high-current, wide-band transconductance amplifier is described that provides an unprecedented level of output current at high frequencies with exceptional stability. It is capable of converting a signal voltage applied to its input into a ground-referenced output rms current up to 100 A over a frequency range from DC to 100 kHz with a useable frequency extending to 1 MHz. The amplifier has a 1000-W output capability ±10 V of compliance, and can deliver up to 400 A of pulsed peak-to-peak current. The amplifier design is based on the principle of paralleling a number of precision bipolar voltage-to-current converters. The design incorporates a unique ranging system controlled by opto-isolated switches, which permit a full-scale range from 5 A to 100 A. The design considerations for maintaining wide bandwidth, high output impedance, and unconditional stability for all loads are discussed     

值得重新认识的一个人物,一个群体和一段历史 谈杭稚英与月份牌画对中国现代美术史和设计史的意义

月份牌为何而热月份牌是中国近代广告的特殊载体。说到“老月份牌画”就不能不说其代表之一杭稚英先生。杭稚英活跃在20世纪20-40年代的上海。20年代前期在商务馆向外籍教师学得西画技法，后来在商务馆从事广告设计、名声鹊起，终于自立门户，组成规模可观的稚英画室，成为中国早期“装潢”广告事业先驱群体的代表、因其艺术成就和经营规模，当时有“月份牌半壁江山”之誉。