转基因动物专利:历史和存在的问题

回顾了转基因动物专利的发展历史，对欧美在转基因动物可专利性之历史演变过程中的几个转折点的成因作了技术、法律、经济和伦理角度的分析．     

漏电开关保护方式的探讨

<正> 1 漏电保护器的保护方式1.1 目前常见的保护方式及存在问题 目前装设漏电保护器最常见的有两种保护方式:一种是在变压器低压侧装设总保护,另一种是在线路末端装设末端保护。这两种保护方式都存在一定的缺点。总保护的缺点是当线路末端发生接地故障时,保护器动作,整个供电范围全部停电。总保护     

反应堆功率流量保护中智能化的研究

本文介绍了反应堆超功率保护、超功率流量比保护、一回路断流量事故保护及泵高速低流量和泵低速过低流量保护等系统中利用一台微机实现安全保护智能化的研究。文中以××反应堆为母型,根据反应堆运行时对上述安全保护系统的要求介绍了微机控制的保护功能、为实施这些功能所采用的硬件及应用软件流程,指出了在反应堆功率流量保护中利用微机实现智能化的特点。     

一种短波电台频率合成器的研制

该文介绍一种采用Ｍｏｔｏｒｏｌａ公司ＭＣ１４５１４６和ＭＣ１２０１７／１８蕊片构成的短波电台频率合成器的硬件电路实现方案。频率合成器的输出频率范围２～２９．９９９９ＭＨｚ，频率间隔１００Ｈｚ，换频时间小于０．０１ｓ。文中论述了这种多环数字式频率合成器工作原理，各环路之间对应的频率关系和电路参数的选择，给出了频率合成器的试验结果．     

河南省发展科技产业的五大制约因素

近几年,我省科技产业获得了很大的发展,在我省国民经济发展中发挥着越来越大的作用,但各种制约因素也越来越突出地表现出来。这些制约因素具体来说有:1.缺乏创业人才脱颖而出的文化氛围文化环境是深层次的、影响深远的重要因素。我国有五千多年的文明史,培养了大量的知识分子,也有大量的领先于世界的文明,河南更是我国古代文明的发祥地。然而,近代以来却没有把中国的工业(也可称之为当时的高科技产业)发展起来,虽然有惊世的发明,却未能使之转化为巨大的物质财富,成为民富国强的基础。造成这种状况的原因就在于我国几千年来积淀的文化传统的…     

频率合成式无线语音传送系统的研究

本文介绍的是一种无线语音传送系统，它是由两部分构成的，发射部分和接收机部分．发射部分采用最先进的频率合成技术，发射频率稳定．最适合大教室教学场合应用。     

碗扣式多功能脚手架CO2气体保护自动焊机

采用CO2气体保护焊工艺研制了碗扣式多功能脚手架CO2气体保护自动焊接设备，在零部件尺寸不规范的条件下，利用电、气动机构实现多个工件的同时准确自动装卡及自动焊接，焊缝成形好，质量稳定，提高了生产效率，节约了能源及4／5的劳动力。     

Discovering Frequent Subtrees from XML Data Using Neural Networks

By rapid progress of network and storage technologies, a huge amount of electronic data such as Web pages and XML has been available on Internet. In this paper, we study a data-mining problem of discovering frequent ordered sub-trees in a large collection of XML data, where both of the patterns and the data are modeled by labeled ordered trees. We present an efficient algorithm of Ordered Subtree Miner （OSTMiner） based on two- layer neural networks with Hebb rule, that computes all ordered sub-trees appearing in a collection of XML trees with frequent above a user-specified threshold using a special structure EM-tree. In this algo- rithm, EM-tree is used as an extended merging tree to supply scheme information for efficient pruning and mining frequent sub-trees. Experiments results showed that OSTMiner has good response time and scales well.     

榆林市能源化工知识产权保护培训会在榆召开

什么是知识产权制度？如何充分应用它为经济建设和科技进步服务？是许多人迫切想知道和了解的。为了贯彻落实省委、省政府“关于加快陕北能源化工基地建设的意见”加强知识产权队伍建设和制度宣传、提高广大干部的业务水平。     

Coastal wetland in South China： Degradation trends, causes and protection countermeasures

There are abundant coastal wetlands in South China and their main characters are the tidal flats, mangroves and coral reefs. In this paper, the status quo of coastal wetlands in South China is introduced and their degradation trends in the last decades are analyzed based on the existing literatures and information. Their degradation trends are characterized by reduction of coastal wetlands＇ area, pollution of seawater environment, degeneration of ecological environment, sharp decrease of biodiversity in the wetlands and so on. At the same time, the causes resulting in the above-mentioned degradations are discussed, mainly concluding imperfect systems of management and legislation, deficient property and assessment systems of the wetlands, weak consciousness of protecting coastal wetlands, shortage of basic study and backward management level and so on. Some countermeasures are put forward for the sake of a sustainable use of the coastal wetlands of South China, mainly including establishing and perfecting administrative and legal systems for the coastal wetlands, developing the study on assessment of coastal wetland, heightening the consciousness of public participation, and strengthening scientific research and establishment of wetland nature reserves.