Spatial ecology of common carp (Cyprinus carpio) in Lake Winnipeg and its potential for management actions

Common carp feeding and spawning behaviours negatively impact the functioning of marsh ecosystems. In the Netley-Libau Marsh, situated on the southern end of Lake Winnipeg, water level regulations, nonpoint source nutrient pollution, and the non-native common carp are thought to be the main contributors to the degradation of the marsh habitat. Using acoustic telemetry, we analysed the movement rate, frequency and timing of suspected spawning migrations, spatial ecology, and aggregation of common carp in the Lake Winnipeg drainage over a three year time period. Common carp moved the farthest during the open water period when water temperature was >5 °C. Their annual migration into Netley-Libau Marsh was correlated to ordinal date. Common carp left the marsh in late spring/early summer, presumably feeding in Lake Winnipeg, before moving to overwintering sites situated in Traverse Bay and Lake Winnipeg, where they arrived typically by October and formed aggregations. These findings will inform habitat and fisheries managers in the effort to undertake evidence-based management actions. The predictability of the movements and the tendency for common carp to aggregate indicates that exclusion techniques and commercial fishing may represent viable management solutions.     

Spatial ecology of Bay of Quinte walleye (Sander vitreus): Annual timing,extent, and patterns of migrations in eastern Lake Ontario

Walleye (Sander vitreus) are the top nearshore predator in the Bay of Quinte and eastern Lake Ontario, where they have strong ecological and socio-economic impacts. The population is known to migrate seasonally; however, the precise timing and extent are not well defined. This study used acoustic telemetry to provide a fisheries-independent measure of timing, extent, and seasonal distribution of migration in Lake Ontario and to examine the influence of sex, spawning river, size, and year. Annual detection histories were used to determine the timing of migrations into and out of the spawning rivers, departure from the Bay of Quinte post-spawn, and the pre-spawn return to the Bay of Quinte. Sequence analysis was subsequently used to examine how fish occupy defined regions of eastern Lake Ontario annually and identify patterns in migration strategy. Spawning site fidelity was high for both rivers (91–97%) and annual residency within the Bay of Quinte was low (9.5%). Females spent less time in spawning rivers, migrated to the main lake earlier, and generally travelled further than males. Larger fish also migrated to the main lake first and travelled further, and differences in timing between spawning rivers were minor. Annual differences in timing were observed and were most likely related to environmental differences between years. Cluster analysis was used to identify groups of fish which utilized unique annual migration strategies and demonstrated sex and size had an important influence on the variability in annual spatial occupancy, but the importance of spawning river and year was minimal.     

运载火箭遥测参数起始电平自动判读软件设计与实现

为了提高运载火箭遥测参数起始电平的判读效率和覆盖性,更好地满足高密度测试的需求,在此基于LabVIEW平台和ACCESS数据库设计开发了一款遥测参数起始电平自动判读软件;该软件融合了数据库模型、组播接收、全波道计算、全帧挑路、自动判读、包络分析、实时显示、故障报警等多个功能,可实现遥测参数全波道数据的自动测试;该软件在多个型号运载火箭测量系统综合试验中进行了应用,高质量的完成了测试任务,相比于传统人工判读模式,在判读效率和精细化程度上具有明显优势.     

基于4G通信的民机试飞遥测监控技术架构

民机适航审定试飞时需要传输海量的测试数据,由于试验科目的苛刻要求,试飞任务需在多地同时开展。针对这种需求,提出一种基于4G通信的民机试飞监控技术架构,构建多地试飞一体化测试网络,并通过了飞行试验数据传输测试,该技术架构可满足试验机试飞数据高速传输需求,满足试验数据多地传输需求。该技术的应用增强了安全监控能力,提高试飞效率。     

基于遥测事后数据处理的专家系统设计

运载火箭飞行试验中,领域专家主要利用遥测事后参数处理结果进行人工分析和判断火箭内部工作状况、效率低下,且领域知识的延续性也受到影响;为解决此问题,本文采用基于框架的知识表示方法,关系数据库和专家技术相结合,提出了一个基于遥测事后数据处理的专家系统原型,该原形采用了规则和框架的方法来表达复杂多样的遥测知识,可以为领域专家进行辅助决策,提高了工作效率。该原型系统具有良好的扩充性和稳定性。     

面向故障分析的遥测参数可视化平台

随着国内商业航天的快速发展,各种新型飞行器逐渐进入发射场开展飞行试验;为对飞行试验故障进行分析,以通用性和便捷性为目标,使用VC++6.0开发了遥测参数可视化平台;平台实现了同时动态演示飞行过程和动态绘制遥测参数曲线的功能,能够把飞行器弹道姿态与遥测数据直接关联起来;实现了自动标识关键飞行时刻、自动计算极值、矩形放大、全部遥测数据的快速分析显示等功能,提高了故障分析工作的效率;平台能够读取多种飞行器三维模型文件,能够自动设置显示界面,增强了通用性;平台具有遥测参数实时添加功能和坐标轴自动计算等功能,显著减少了准备工作;平台能够独立运行于笔记本电脑,适用于各种新型飞行试验的故障初步分析工作。     

分布式系统多星故障诊断任务调度结构研究

多星故障诊断任务调度模型是构建多星任务调度系统的基础,提出分布式的多星故障诊断调度模型,将调度功能分为三个模块——监控模块、任务调度模块和服务器模块。将这些模块结合起来,便于实现多星的故障诊断,便于系统扩展、维护。以多星故障诊断任务调度的禁忌搜索算法为例,分析各模块之间的关系,为未来多星故障诊断任务划分提供了有力支撑。     

载人火箭的遥测系统

火箭遥测系统的作用是对火箭飞行过程中所有的动态参数进行测量,并以无线发射形式将数据实时发送回地面。载人运载火箭的遥测系统不仅承担了火箭飞行过程中所有动态参数的测量,而且是载人火箭在故障判决工作中的重要组成部分,承担着火箭Ⅰ、Ⅱ类参数的测量和传输,为提高系统可靠性采取了大量行之有效的办法,在系统的关键部分和薄弱环节采取多种形式的冗余、并联等可靠性设计,系统及参数测量的可靠性达到同行业中较高水平。文章对遥测系统的研制任务、系统组成、关键技术和高可靠性等方面进行全面介绍。     

可重组综合测控站

可重组综合测控站是一种新型多功能综合测控设备。该站应用当今先进的可重组技术, 采用在同一个硬件平台上通过软件加载重新组合硬件连接的方法,实现系统功能重组的目的。该站具有一站多能、一机多用的通用的灵活的特点,可以适用于多种体制的测控任务。     

实时测控软件系统测试方法研究

针对基于UNIX平台的实时测控软件系统多进程多线程并发运行、信息流量大、接口关系复杂、实时性强、可靠性高的特点，在分析实时测控软件功能测试的基础上，提出了采用软件集成和嵌入监测模块的方法，实现了对实时测控软件系统CPU使用率、模块级运行效率、资源开销等性能测试，解决了实时测控软件性能测试的难题，为实时测控软件系统研制、质量评定和应用提供了科学的依据．