查询词典 paper-cutting

This paper bases on frequency-hopped and frequency synthesis theories, and through demonstrating three schemes of frequency synthesis, the paper selects one of these schemes that uses DDS spiriting up PLL and improves on the method according to the practical target and synchronously, the paper analysis the capability of the output signal and the conversion time of the frequency.

本文在对跳频理论及频率合成理论分析的基础上，在讨论三种频率合成方案后，设计完成了一种适于本课题的DDS激励PLL的混合方案，并对频率合成器主要性能中的输出信号的噪声特性和频率转换性能做了研究分析。

Based on the situation in Shanghai. this paper applys the theories of in tegration of city and countryside. agriculture in city countryside. agricultur- al modernization arid sustainable agricultural development to deal with the achiveruen t of national industrialization and modernization lie in agrieultura~ modernization ?-? integration of city and countryside -~-? urbanization of rural areas-?-? agriculture in city countryside this is the main clue of the paper. In the view cf history and reality with overall and system. this paper appl~is analysis method of combination of normative and positive. quantattve and qualitive. long-term and short-term and, internal, external arid Shang- hai to discuss relationship among agriculture in city countryside. agricultural modernization and sustainable developrncnt, the history. present and re- straint factors of sustainable development of modern agriculture in city coun- tryside in Shanghai is further analysed. So concepts. goals. index system. selective patterns, developmental strategys and measures of sustainable de- velopment of modern agriculture in city countryside are raisen.

本文立足于上海，依据城乡一体化、都市农业、农业现代化和农业可持续发展理论，围绕着实现国家工业化与现代化的出路在于把农村、农业剩余劳动力转移出来，实现农业现代化——农业剩余劳动力转移必须打破城乡分割，实现城乡一体化——打破城乡分割又必须实现农村城镇化——农村城镇化前提下的农业一定是都市农业的中心线索，全面系统地从历史与现实的角度，运用理论与实践、规范与实证、定性与定量、国内外与上海以及点面相结合的分析方法，探讨了都市农业、农业现代化与可持续发展的关系，分析了上海现代都市农业可持续发展的历史、现状和制约因素，提出了现代都市农业可持续发展的概念和目标、指标体系、选择模式以及发展战略和对策。

The paper sees Horton code as a primary characteristic value and generalizing condition of the river network, and selects, simplifies and generalizes river based on scale of before and after generalization,, The main contents of paper include:(1)Reviews generalization concept, arithmetic operators, methods, influence factor and frame of map generalization and design, analyze core theory of feature —oriented map generalization, discuss the main context and applicable method of river feature generalization(2) Summarizes natural form and spatial configuration characteristic of the river network, and describe the river network using digraph Paper mostly researches tree —like river, identifies the direction of river based on the angle of the main and secondary reach, and identifies the main river based on most length and predominant continuation of the flow direction along the major channel , then receives the grade of river by recursion and structuralize river network, builds hiberarchy rank system of river based on Horton coding(3)Designs the model of river network based on Horton code, and organizes the data of node, branch and river.

本论文把Horton编码作为水系网的一个主要特征值并以此作为综合条件，并根据综合前后的比例尺对水系网进行选取、化简和概括。论文的主要工作包括：(1)总结地图综合的概念、算子分解、实现方法、主要影响因素和总体设计框架，分析面向地理特征的制图综合的核心理论支撑，在此基础上讨论水系专题要素综合的主要内容和综合适用的方法。(2)总结水系网的自然形态和空间结构特征，用图论对水系网进行描述。以树状水系作为主要研究对象，依据树状水系的主支流交汇关系确定水系流向，依据水系中主流的长度最长和主流保持原有的流向趋势确定主流，按此递归得到河流的不同级别，对基于河段组织的水系网结构化，自动建立水系的Horton编码。(3)设计基于Horton码的水系网模型，对结点、河段、河流和河系的数据进行有效的组织。

But the result of life cycle assessment shows that paper has not the advantage of plastics in environmental protection.This paper analyses and assesses both Plastics and paper package materials using sumple life cycle matrix.

然而生命周期的评价结果表明，纸在环境保护方面并不具有优势，本文采用简式生命周期矩阵对这两种包装材料进行了分析和评价。

Comparing with the conventional modes of hydrological information transmission, the paper analyses the reality of mobile system and the protocol of Short Message Service in the GSM network. Secondly, the paper briefly introduces the realization of hydrology telemetric system. In addition, the paper shows the imperfection of Short Message Service with the other ways, for example, Data Service in the mobile network.

本文首先讲述了水情遥测系统的各组成部分，随后对比传统的水情信息的传输方式，结合移动通信系统的发展现状，分析了GSM短消息业务的各种协议，提出利用GSM移动网络中的短消息进行水情数据的传输，并简要讨论了基于GSM移动网络短消息的水情遥测系统的规划与设计，最后分析了短消息业务的局限性，并提出利用移动网络中的数据业务等其他方式对其进一步的补充。

The manipulator uses PLC to control.The paper institutes two controls chemes of PLC acordine to the work flow of the manipulator.The paper draws out the work time sequence chart and the trapezia chart.What's more,the paper work out the control program of the PLC.

利用可编程序控制器对机械手进行控制，选取了合适的PLC型号，根据机械手的工作流程制定了可编程序控制器的控制方案，画出了机械手的工作时序图和梯形图，并编制了可编程序控制器的控制程序。

And has brilliant prospect due to its simple structure, good economy and energy saving performance.Based on the full scale passive solar experimental building in DUT, in which the researcher carried experiment as the main method and the CFD simulation as the minor method, the research focuses on passive ventilation formed by the Trombe wall. This paper analyzed the indoor thermo and humidity performance of passive solar building with Trombe wall, and the different ventilation patterns in different seasons, revealing the role of passive ventilation in improving indoor environment. Also the paper researched the characteristics of passive ventilation on air flow and heat transfer mechanicsms, and put forward the best control and adjusting method. Meanwhile the paper gained an empiric formula in use of calculating the natural convection heat transfer and found the key factor of influing the indoor environment.

本研究以被动式采暖降温技术为依托，采用实验和CFD数值模拟的研究方法，重点研究了新型被动式太阳房在不同气候条件下室内热湿环境的动态变化规律，分析不同季节下被动式太阳房内不同的被动式通风模式以及不同被动式通风模式在改进室内热湿环境方面的作用：揭示了特定被动式通风流动和换热特性、控制与预测方法；得到了计算被动式通风对流换热量的经验公式以及影响室内热湿环境的关键因素；了解了含有特朗贝墙体被动式太阳房的自身优势和仍待改进的方面；在实体大被动式太阳房实验技术方面积累了一定的经验。

At last the paper realized the advantages and disadvantages of passive solar building and adnvanced some suggestions in future research. From another point, the paper logged the process of the building of the experimental equipment and the mounting of the measurement equipments that accumulated some operating experimence.Carrying experiments, calculating and analyzing the experimental data for more than 2 years, the paper gained some constructive conclusions. In winter the indoor air temperature and RH are lower than comfort criteria, but people feels very comfortable in the passive solar house. The thermo-circulation formed by Trombe wall play an important role in improving indoor air temperature and RH. Based on the analogy analysis theory, the natural convection heat transfer in the air gap can be treated as superposition of two natural convection heat transfer processes occurring over isolated isothermal vertical flat plate, in this case namely the massive wall and glazing. Two empirical formulas for Q and Nu are obtained. The investigation shows that the optimal time to open the damper should comply with the period that the thermo-circulation happens which can be controlled by thermal response characteristics of Trombe wall surface temperature and air temperature in the air gap.

经过两年多的实测和计算，根据传热学、流体力学、统计学等学科的基础理论，对大量数据进行整理归类、分析讨论，主要得到如下结论：(1)冬季，含有特朗贝墙体的被动式太阳房室内热湿环境较舒适性标准偏低，但人体感觉比较舒适，特朗贝墙体形成的热循环通风在调节室内温度和相对湿度方面起到很大的作用；(2)特朗贝墙体空气间层自然对流可以看作是两个等温独立大平板的自然对流换热过程的叠加，通过与大平板自然对流理论类比获得了计算热循环过程中对流换热量的经验公式；(3)特朗贝墙体通风口的启闭可以根据玻璃幕墙内壁面温度、蓄热墙体外壁面温度和空气间层进出口空气温度之间的关系来进行控制，从而有效地阻挡冬季冷循环的发生；(4)夏季，如没有有效的通风降温措施，被动式太阳房内会产生明显的过热。

Basing on the realities mentioned above, the contents of this paper are as follows:First, the paper is summarized the results of tension test on geosynthetics. Then the paper presents the contents and results of tension properties on uniaxial oriented geogrid, warp knitting geogrid, woven geotextile and unwoven geotextile.

首先，归纳总结国内外土工合成材料拉伸试验的研究成果，通过室内试验研究常用的加筋材料——单向土工格栅、经编土工格栅、有纺土工布和无纺土工布的拉伸特性。

This paper analyzes current land use characteristics of Wuxi URIA. Meanwhile, based on satellite imageries, this paper extracts URIA land use information of 1984 and 2001 to analyze land-use structure. Moreover, using primary factors affecting land use in URIA, this paper builds a regression equation to predict the changes of urban built-up area and cropland within ten years of Wuxi.

本文分析了近年来无锡市城乡结合部的土地利用特点；同时基于遥感数据源，提取出1984和2001年无锡市城乡结合部的土地利用信息进行土地利用结构分析；并且利用驱动城乡结合部土地利用变化的主要因子建立多元回归模型，预测10年内无锡市建成区与耕地面积的变化趋势。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。