CPLD/FPGA Programmable Logic Devices'' In System Reconfiguration Method

This article has discussed the methods of configuring the CPLD/FPGA devices based on SRAM, and choose the microprocessor to configure the FLEX10k devices of ALTERA. From the article ,we can see that this low cost and easy done method can enable the system to configure the CPLD/FPGA devices automatically as soon as the system is re set or power is re added to it. It has solved the problem that CPLD/FPGA devices based SRAM may lose it's logic function when dropped out of power, and it enables the single chip to have several functions.     

加强木材生产信息化管理提高森工企业经济效益

结合近年来木材生产的发展进程和现状 ,通过采取新举措 ,加强管理 ,实现经济效益最大化     

西气东输管道压气站的机组选型

在大型输气管道的设计中,压气站的机组选型是一项关键技术.根据西气东输管道的设计实践,阐述了压气站驱动方式的比选和压缩机组配置中考虑的问题.经济技术比较结果表明,西气东输管道工程使用一用一备的机组配置型式符合长输管道的建设原则.     

结构设计存在问题初探

本文对结构设计中常因概念不清、经验不足而容易产生不良后果的一些问题进行论述,旨在 提醒人们在设计中对这些问题的重视,以避免此类事情的发生,达到安全耐久、经济合理、美观适用的要求。     

重庆园林植物配置不合理案例分析

结合重庆主城区的典型案例,分析重庆园林配置存在的最为常见的3种不合理现象：不伦不类型、简单引种型、雍肿复杂型;并分析导致这3种不合理配置现象的原因。     

临夏州青贮玉米栽培技术

粮改菜政策的推广是将玉米籽粒收获改为青贮玉米,用青贮玉米饲养牛羊可以增加饲料的利用率,增加经济收入。"粮改饲"的重点是调整玉米种植结构,开发适合牛、羊需求的大型青贮玉米。改革的重点是实行循环种植与育种相结合,引导优质饲料的种植,提高玉米生物产量,大力发展舍饲养殖,促进农业畜牧业的良性循环,优化农业产业结构,提高农业畜牧业的附加值,增加经济效益。发展食草性畜牧业,促进农业生产结构的优化。     

集成随机配置网络在养殖水质监测中的应用

为解决集约化水产养殖过程水体氨氮浓度无法实时检测的问题,提出基于Bagging集成随机配置网络(stochastic configuration network,SCN)的建模方法,利用养殖过程采集的相关水质参数对养殖水体氨氮浓度进行软测量。该方法首先采用Bootstrap方式生成多个不同的训练子集,然后并行训练多个SCN模型,最后将各个SCN模型的输出结果取均值作为Bagging-SCN模型的输出。为验证方法的有效性,分别通过UCI标准数据库中的机翼自噪声数据集和集约化海水养殖过程数据集进行了仿真试验,将该研究提出的Bagging-SCN模型与单一SCN模型、以及目前应用最广泛的随机权向量函数连接网络(random vector functional-link net,RVFL)模型、Bagging-RVFL模型的测量效果进行了比较。试验结果表明:该文所提模型对机翼自噪声数据集中缩放声压级测量的均方根误差、平均绝对百分比误差和最大绝对误差分别为4.225 dB、2.599%和17.500 dB;在对集约化海水养殖过程中水体氨氮浓度测量的均方根误差、平均绝对百分比误差和最大绝对误差分别为0.0628 mg/L、27.851 mg/L和0.189 mg/L均优于其他测量模型;进一步说明该模型具有较高的测量精度和稳定性,更适合应用于集约化水产养殖水质监测过程。     

Testing the importance of spatial configuration of winter habitat for woodland caribou: An application of graph theory

Conservation of remaining woodland caribou (Rangifer tarandus caribou) populations requires land management strategies that not only maintain caribou habitat, but also favour habitat connectivity. This study presents and field tests graph theory-based measures of landscape connectivity, and demonstrate an association between the distribution of woodland caribou and well-connected winter habitat. Cost values for the intervening land cover types were determined based on the probability of selection relative to high-quality winter habitat. Habitat connectivity was then represented by linking high-quality habitat patches along least-cost paths through this parameterized cost surface. A randomization procedure was used to assess the animal’s association with habitat connected at increasing distance thresholds to identify appropriate scales of response. A strong relationship was obtained between large clusters of high-quality winter habitat patches and winter GPS telemetry location points (November 1-March 15) from two woodland caribou herds in Manitoba, Canada. This relationship was stronger when only late winter location points (January 1-March 15) were used. Our results highlight the importance of accounting for the spatial configuration of habitat on the landscape and the intervening land cover types when assessing range quality for woodland caribou. They also provide support for the use of graph theory to assist in identifying core activity areas for woodland caribou and key linkages between these areas and other parts of the landscape.     

浅谈原木腐朽规律与合理造材

介绍了原条腐朽判断的要点及各树种的木材腐朽规律,为合理造材提供了借鉴资料。