查询词典 cost performance

In the last new years , as the demands of wireless communication system grows rapidly , the bands of microwave frequency had been saturated with various communication applications . To achieve wider spectrum for high-speed and high-capacity transmission , bands of millimeter-wave frequency are the solution of this problem . The advantage of MMW wireless communication systems is wider bandwidth comparing with microwave communication systems . To utilize the spectrum efficiently , many methods of complexly digital modulation is proposed . The more complex modulation , the higher linearity is required , and more various phase of signals are required to accomplish process of modulation . Therefore high-linearity and quadrature-phase modulator and demodulator are the emphasis of this thesis . For high level of integration , high performance and low cost , this chip is fabricated by the complementary oxide semi-conductor 0.13um process . A compact size of direct down-conversion and direct up conversion circuits will be presented in this thesis .

近年来随著无线通讯产业的蓬勃发展，微波频带已经趋近於饱和，为了追求更宽的频谱来达到更快传输速率及高资料容量的传输，宽频的毫米波频段提供了解决此问题的途径，毫米波无线通讯系统提供了相对於微波通讯系统宽频的优点，且为了更有效的使用频谱，各种不同且复杂的数位调变方式及方法被发表出来，越复杂的调变方式其所需的线性度越高，且需要更多不同的相位讯号来完成调变的过程，因此高线性度及四相位的调变及解调器将是此篇论文的研究重点，为了达到高整合性，高效能，及低成本的电路设计，我门利用互补式金氧半导体制程来完成此电路设计，因此一小面积的直接降频(Direct down-conversion)及直接升频(direct up-conversion)电路将在文中介绍。

This digital thermometer design uses the American DALLAS Semiconductor Company after DS1820 promotes one kind of advanced version intelligence temperature sensor DS18B20 takes the detecting element, the temperature measurement scope may amount to 0.0625 degree Celsius for the - 55--125 degree Celsius biggest resolution, may the direct readout measure the temperature to plant, moreover used the three-wire system and the monolithic integrated circuit is connected, reduced the exterior hardware circuit, has at the same time the characteristic which the low cost and easy to use it to have the microminiaturization, the low power loss, the high performance, the anti-jamming ability strong, easy to match merits and so on microprocessor, the especially qualify in constituted the multi-spot temperature observation system, might directly the temperature inversion serial digital signal for microcomputer processing, moreover each piece of DS1820 had onlyThe product number and may store in its ROM, in order to constitution large-scale temperature observation system time hangs on the single track meets willfully many DS1820 chips.

本数字温度计设计采用美国DALLAS半导体公司继DS1820之后推出的一种改进型智能温度传感器DS18B20作为检测元件，测温范围为-55——125摄氏度最大分辨率可达0.0625摄氏度，可以直接读出被测温度植，而且采用三线制与单片机相连，减少了外部的硬件电路，具有低成本和易使用的特点同时它具有微型化、低功耗、高性能、抗干拢能力强、易配微处理器等优点，特别适合于构成多点温度测控系统，可直接将温度转化成串行数字信号供微机处理，而且每片DS1820都有唯一的产品号并可存入其ROM中，以便在构成大型温度测控系统时在单线上挂接任意多个DS1820芯片。

Taking stock total cost and rate of shortage as two performance indexes of the system, simulation model was created.

以库存总费用和缺货率为系统性能指标，建立仿真模型，将二者加权平均给出策略的综合系数的计算公式。

But on the other hand, the steel construction has the disadvantages of poor fire prevention, bad antiseptic performance and high the fabrication cost.

但与此同时，钢结构也有防火、防腐性能差，造价偏高等缺点。

The control of the application of the starting torque from the belt drive system to the belt fabric affects the performance, life cost, and reliability of the conveyor.

从传送带驱动系统到传送带纹理结构启动力矩的应用和控制影响着运送机的性能，寿命和可靠性。

The cement coagulation earthen road pavement stave compaction technology is a repair major damage cement road surface new technology, can solve the old cement road surface to spread the reflection crack question which the brea bed produces, has the building cost of projects to be low, the construction is convenient, affects the small merit to the transportation, provides the good driving performance for the newly built road surface.

水泥混凝土路面破碎压实技术是修复严重损坏水泥路面的一项新技术，能够解决旧水泥路面加铺沥青层所产生的反射裂缝问题，具有工程造价较低，施工方便，对交通影响小的优点，为新建路面提供良好的行车性能。

They used limestone of different quality and large-fluctuant-range waste stone in proportion and substituted a part of clay with clay stone to produce cement. And the physical performance of the produced Portland cement was improved greatly-28 d strength increased from 50.4MPa to 54.5MPa, and output of the rotary kiln increased. Moreover, the company also tried to use green shale as admixture to produce compound cement and successfully produced compound Portland cement with a little low early strength and a little higher 28d strength than slag Portland cement. And the cement cost decreased 19.59 yuan per ton.

将CaO含量波动范围较宽的废石与不同品位石灰石按比例搭配使用，将其粘土质特性的废石替代部分粘土生产；而且生产的硅酸盐水泥熟料物理性能有较大提高，28d强度由原来的50.4 MPa提高到54.5 MPa，窑产量也有一定的提高；此外，该公司还进行了将绿色页岩作混合材生产复合水泥的生产探索，成功生产出了早期强度略低，但28d强度略高于矿渣硅酸盐水泥的复合硅酸盐水泥，且使水泥生产成本降低19.59元/t。

The optimized design for knife disk of a mobile wood chipper was provided in order to improve the cutting performance and decrease the self-weight of the chipper, therefore to further reduce the energy consumption and production cost,and then increase economic efficiency.

介绍了在设计移动式小型卧式枝桠削片机的过程中，对削片机切削性能和自身质量影响较大的刀盘进行优化的情况，为刀盘改进提供一定的理论依据。优化设计后减少了能耗，降低了生产成本。

Genetic algorithm is the means to provide a generic and robust method for getting the minimum cost form all possible data schema. Taking advantage of GA's self-adaptive and self-adjustable features, this method improves the level of automatic database schema design. 4. Based on XML characters and Chomosky Grammar theory, this dissertation presents X-Grammar and pushdown automaton model to extract structure information from XML data with high performance.

通过人工智能技术中的遗传方法的自适应性和自治性，根据应用需求和系统负载情况，调整数据模式，提高了数据库中模式寻优的自动化程度，为人工智能技术在数据库的应用提供了一个新的切入点。

Technological superiority:"saving energy, reducing dust, green environmental protection" is our consistent goal of scientific research personnel through the company's unremitting efforts, we developed extruded fish meal, blood meal, feather meal production line with the traditional processing methods than with less equipment investment, processing low-cost, non-polluting process, product palatability, and high rate of digestion and absorption characteristics; Extruder screw, gas plug, such as the service life of wearing parts is a measure of the merits of Extruder key performance indicators, U.S. Extruder wearing parts and the use of special wear-resistant material with a special deal with the characteristics of long life; we develop SJWK-type feed processing equipment Hebei Feed Industry Association recommend designated as high-quality products and by patent country.

技术优势：&节能降耗、减少粉尘、绿色环保&是我们一贯追求的目标，经过公司科研人员的不懈努力，我们开发的膨化鱼粉、血粉、羽毛粉生产线与传统加工方法比具有设备投资少、加工费用低、加工过程无污染、产品适口性好、消化吸收率高等特点；膨化机的螺旋、气塞等易损件的使用寿命是衡量膨化机性能优劣的关键指标，我们的膨化机易损件采用特种耐磨材料并经特殊处理，具有寿命长的特点；我们开发的SJWK型饲料加工设备被河北省饲料工业协会指定为名优推荐产品，并获国家发明专利。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。