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Search Results: 1 - 10 of 92094 matches for " 周 炜 "
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武汉市第三产业就业容量观控分析

科技进步与对策 , 2003,
Abstract: 对武汉市第三次产业的就业需求、可能的就业容量及就业需求与就业容量之间的差距进行了宏观分析,从加快第三产业发展和减缓就业弹性系数下滑速度两方面探讨了扩大第三产业就业规模的对策。第三产业就业就业容量武汉市
495例女性生殖道支原体感染状况及药敏分析

中国热带医学 , 2012,
Abstract:
电离层的直接探測研究

地球物理学报 , 1963,
Abstract: 本文叙述了利用地球物理火箭和人造地球卫星研究电离层和无綫电波传播的各种实驗方法,对各方法之間的关系及其所能解决的問题作了說明,并綜述了在这方面已經得到的重要研究成果。最后扼要地指出了今后研究的主要趋向。
多元化经营背景下家庭农场水稻生产效率――基于全国农村固定观察点的实证研究

南京农业大学学报(社会科学版) , 2017,
Abstract: 包产到户"使农村土地细碎化、农业经营多元化。新型农业经营主体发展壮大,适度规模逐步完善,给农业发展带来新机遇。为更好地促进农业生产效率提升,本文利用2011年全国农村固定观察点水稻调研数据,选取家庭农场新型经营主体,通过构造多元线性回归模型,分析多元化经营背景下家庭农场水稻生产效率。研究结果显示:样本家庭农场多元化经营会导致其水稻生产效率的损失;同时,随着家庭农场主受教育水平的提高以及家庭劳动力数量的增加,其生产效率随之提高;技术支持水平的提升亦能促进水稻生产效率的提升。本文针对家庭农场这一新兴农业经营主体的研究,力求为我国一些地区农业现代化研究和实践提供新思路,为我国传统农业向现代农业逐步转型提供参考。
With the development of industrialization and urbanization, the rules of ‘making and producing households’ caused the rural land fragmentation and the agricultural operation diversification.At the current stage, a new round of agricultural policy environment improvement has brought new opportuni-ties for agricultural development:the expansion of new agricultural business management and the gradu-al improvement of appropriate scale.In order to improve the efficiency of agricultural production, this paper, with the use of The 2011 National Rural Fixed Observation Point Rice Research Data, and with the selection of the new family farm management through the construction of Multiple Linear Regression Model, analyzed the diversified management background under the background of rice farmer production efficiency.The results showed that the diversification of the sample family farms would lead to the loss of rice production efficiency.At the same time, with the increase of the education level and the increase of the family labor force, the production efficiency would increase and the technical support level will promote the rice production efficiency.This paper aimed to provide a new idea for the research and practice of agricultural modernization in some areas of our country, and provide a reference for the gradual transformation of traditional agriculture to modern agriculture
面向多路4~20 mA信号远程传输的输出电路设计方法
The Output Circuit Design Method for Remote Transmission of Multi-Channel 4 - 20 mA Signal
 [PDF]

, 雅夫,
Computer Science and Application (CSA) , 2012, DOI: 10.12677/CSA.2012.23023
Abstract: 本文提出了一种面向多路信号远程传输的4~20 mA输出电路设计方法,该电路与目前广泛应用的同功能电路不同,可实现多路4~20 mA信号在远端共地,不仅解决了远端计算机共地采样问题,而且节省了大量布线。通过仿真分析和电路实验测试,证明所提出的电路硬件设计方法具有布线简单、精度高等优点,能够满足多路4~20 mA信号的远程传输需求。
This paper introduces a novel design of 4 - 20 mA output circuit about remote transmission of multiple signals, it is a different circuit with the widely used at present, the circuit can realize the multi-channel 4 - 20 mA signal common ground in the distal. This new method not only can solve the problem of sampling of distal of the same computer, but also can save a large amount of wiring. Analyzed by computer simulation and circuit experiment, we prove that the proposed circuit hardware design method has the advantages of high precision and simple wiring, and it is able to meet the application in multi-channel 4 - 20 mA signal remote transmission.
一种适用于中大型地区调度的微机SCADA系统

电力系统自动化 , 1994,
Abstract:
地方高校科技查新申报与管理的网络实现

惠州学院学报 , 2012,
Abstract:
金融市场的宏观建模和微观建模——从金融海啸与市场风险谈起

物理 , 2010,
Abstract: ?金融市场是一个复杂系统,高风险大波动危象频仍,而传统经济金融理论对此无能为力.文章从复杂性科学视角出发,通过市场宏观建模,描绘出当前金融海啸一幅泡沫演化和湮灭的图像.文章进一步论述了一个基于市场微观模型的计算实验金融学框架,认为金融学应当重建唯象学框架,并指出金融物理学在经济学科学革命中的重要性.
基于二层隧道协议的虚拟专用网研究
,
计算机应用 , 2007,
Abstract: ?分析了二层隧道协议(l2tp),以及基于此协议的虚拟专用网(vpn)的四种组网模型,在此基础上对vpn中的协议报文结构和其对组网安全性方面的考虑进行了讨论。给出了二层隧道协议vpn模块的一种通用设计思路,并实现了该模块。对比其他二层vpn,l2tpvpn能提供更为便利及灵活的应用。
On Mobile Internet Access Techniques
Internet的移动访问技术研究

戴方虎,
计算机科学 , 2001,
Abstract: 移动通信和Internet是信息产业中发展迅速的两个领域,联接这两大领域,利用移动终端真正实现随时随地访问Internet有着诱人的前景。传统的Internet服务主要是基于有线网络的,HTML,HTTP,TCP等协议都基于高带宽、低错误率的有线网络,当移植到无线网中时这些协议就变得效率低下,性能远低于有线网络。移动终端受其移动性和便携性的制约,与桌面
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