Design of sensor energy-saving controller for photovoltaic power generation

传感器储能性能较弱，导致设计出的光伏发电中的传感器节能控制器网络延迟较长、节能效果不理想。因而，设计一种新型光伏发电中的传感器节能控制器，其对供电电路、无线通信芯片和太阳光传感器芯片进行重点设计。nRF905无线通信芯片对控制器中各设备、电路、元件之间的数据通信进行监控，保障节能效果、缩短网络延迟。供电电路为控制器的节能工作供应电能、优化太阳光光强的能量转化。优化后的太阳光能量，将通过太阳光传感器中的TSL2678芯片太阳光进行参数提取和分析，输出太阳能最佳采集方位和该方位的太阳光光强，实现光伏发电的最优节能。控制器软件设计部分给出了控制器的节能控制流程。分析实验结果可知，所设计的控制器具有网络延迟短、节能效果好的特点。Since the sensor energy?saving controller for the photovoltaic power generation has long network latency and unsatisfied energy-saving effect due to the poor energy storage performance of the sensor,a new sensor energy-saving controller for the photovoltaic power generation was designed,and its power supply circuit,wireless communication chip and solar sensor chip were designed emphatically. The wireless communication chip NRF905 is used to monitor the data communication among each device,circuit and component in the controller to ensure the energy-saving effect and shorten the network latency. The power supply circuit supplies the electric energy for the energy-saving work of the controller,and optimizes the energy conversion of so?lar light. The parameters of the optimized solar light energy are extracted and analyzed through the chip TSL2678 in the solar light sensor,which outputs the optimal acquisition orientation of the solar energy and its intensity to realize the optimal energy saving of the photovoltaic power generation. The energy-saving control flow of the controller is given in Fig. 5 in this paper. The analysis experimental results show that the controller has the characteristics of short network latency and good energy?saving effect.国家自然科学基金(70873100);河北省教育厅科学技术项目(Z2014166

香溪河小水电的梯级开发对浮游藻类的影响

以香溪河干流上5个连续的小水电站为对象,于2005年10月20—22日分别对其浮游藻类和主要理化指标进行研究.结果表明:硅藻占绝对优势(95.54%),其中,线性曲壳藻(Achnanthes linearis)、披针曲壳藻椭圆变种(A.lanceolatavar.elliptica)、扁圆卵形藻(Cocconeisplacentula)为绝对优势种,其平均相对丰富度分别为23.96%、18.62%和12.48%;所有样点的平均藻类密度为6.29×105ind.L-1,最高为1.81×106ind.L-1

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2005年5月对黄河水系的42个采样点进行了水质与底栖动物的调查研究。调查结果表明，黄河水质总体污染严重，干流兰州段以上相对较好，但下游及支流水质污染严重。主要污染指标为总氮超标。在这些样点上共采到底栖动物90种，分属5门23科60属。其中，水生昆虫67种（74．4％），寡毛类15种（16．7％），软体动物5种（5．6％），甲壳动物与线形动物各一种（2．2％）。物种组成上水生昆虫的摇蚊幼虫和寡毛类的水丝蚓为主要类群。在数量分布上，全流域底栖动物的平均密度为411．1ind·m2。，生物量为1520．1mg·m2。干流密度与生物量（144．3ind·m2和151．6mg·m-2）相对支流（1173．5ind·m-2和5430．1mg·m-2）明显偏低。与1958年和1982年的资料相比，所获得的物种数相近，但组成上有很大变化：而在密度生物量上，这次调查结果相对较低

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2005年7月～2006年6月对三峡水库湖北库区最大支流香溪河的大型底栖动物进行定量采集,并对所得数据进行了数理统计分析及生态位分析.结果表明,香溪河水系大型底栖动物物种丰富度在不同季节、不同支流间差异均显著;密度在各季节间差异显著.四节蜉、高翔蜉、锯形蜉、朝大蚊和扁蜉生态位较宽;Tetropina sp.、短尾石蝇、黑蝇生态位较窄.四节蜉、高翔蜉、锯形蜉、朝大蚊与其它分类单元生态位重叠值较大,黑蝇、短尾石蝇、直突摇蚊、Tetropinasp.与其它分类单元生态位重叠值较小.相对丰度和生态位宽度对生态位

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Orientador: Suzi Frankl SperberDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de ArtesResumo: Essa dissertação propõe a investigação de uma prática para atores, que sirva tanto para o contexto teatral quanto para o performativo. Buscam-se procedimentos que pouco a pouco permitam a autonomia dos atores para que eles possam encontrar seu próprio caminho estético e treinamento. Para tanto, este estudo tem como referência a Coreologia o Viewpoints, o Movimento Imagem e os Jogos Teatrais.Abstract: This thesis proposes the investigation of a practice to actores that serves to theatral context and performative context. The searching of procedures that step by step permit an actors'autonomy to they persue their own aesthetics and training way. Therefore, this study has as reference the Coreology, the Viewpoints, the Moving Image and the Theater Games.MestradoTeatro, Dança e PerformanceMestre em Artes da Cen

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Dipping maize seeds in a very small amount of herbicide blocks the ability of Striga hermonthica to parasitize and kill crops. Experiments over the past two years m Kenya have shown that dipping seeds in the herbicide imazapyr can triple the yield of maize. The results of the trial were announced earlier in the year at the Sixth Parasitic Weed Symposium in Cordoba, Spain. The technique has been developed by researchers at the Kenyan Agricultural Research Institute (KARI) at Kisumu, Kenya, together with plant geneticists from the Weizman Institute of Science in Rehovot, Israel. Currently, the technique is based on using a herbicide-resistant strain of maize developed by an American seed company, Pioneer International. Pioneers strain of maize can withstand herbicides which block the action of an enzyme called ace to lactate synthase . Without this enzyme, striga is unable to make vital amino acids, and dies. Trials showed that, on average, a plot of treated seed yielded almost 3.5 times as much maize per plot compared to plots of untreated seeds which had five times as much striga growing in them as the treated plots. As the dipped seeds grow, the herbicide diffuses into the growing tissue and surrounding soil, killing the striga before it can get a hold. By the time the maize is harvested the herbicide in the soil has broken down. The use of this seed-dipping technique cuts out the need for potentially harmful spraying and eliminates the buildup of residues in the soil. Additionally, the cost of using such small quantities of herbicide is so little that even the poorest subsistence farmer could afford the technology. Just 15 grams of herbicide costing $5 is enough to treat one hectare, and could bring a farmer an extra$100 of income per hectare in improved yields. At present this Pioneer strain of maize, which was developed for use in the US, is susceptible to African fungi and viruses. The KARI researchers are now crossing the Pioneer strain with African varieties to produce a herbicide-resistant maize that is suited to local conditions. George Odhiambo and Gordon Abayo Kenyan Agricultural Research Institute Kisumu, KENYADipping maize seeds in a very small amount of herbicide blocks the ability of Striga hermonthica to parasitize and kill crops. Experiments over the past two years m Kenya have shown that dipping seeds in the herbicide imazapyr can triple the yield..

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基于对香溪河河流生态系统的多年研究，以该流域河流大型底栖动物最优势类群四节蜉为指示生物，建立了我国大陆地区第一个基于长期的连续的野外现场实测数据的水生生物栖息地适合度模型（habitat suitability model，HSM）．为保护河流生态系统结构和功能的完整性，文中将河道内环境流量分为3个层次，即河道内最小需水量、最小环境流量和适宜环境流量，并利用水文法和加权可利用面积法（weighted usable area，WUA）分别构建了这3个层次的河道内环境流量的计算模型．结果表明：香溪河的最小需水量为Tennant法中描述为差或最小状态的流量（即0．615m^3·s^-1），为保护河流生态系统健康、维系河道景观多样性，应将多年平均流量的42．91％（即2．639m^3·s^-1）作为研究地点的适宜环境流量．综合考虑水文和生物因素，从3个层次确定了河道内环境流量，可以为香溪河水资源的合理配置和综合管理提供技术支持，同时为较准确地计算河道内最小环境流量提供探索性研究

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本书是由中国气象局气候中心组织20余位在长江三峡库区研究中具有气候变化及影响研究丰富理论和实践经验的专家，经过大量资料收集、总结归纳以及作者现有研究成果撰写而成。位于长江上游的三峡库区，因其特殊的自然地理位置，深入探索气候变化对其各方面的影响，有助于积极适应和减缓气候变化，保证三峡工程安全运行，对保障三峡库区的可持续发展有重要意义。全书共分八章，在阐述三峡库区气候变化事实的基础上，分析气候变化对库区水资源、农业、自然生态系统、人体健康、电力、航运、旅游等方面的影响、脆弱性和适应性，并因地制宜地提出适应与减缓对策，为全球气候变化背景下三峡库区社会经济的可持续发展提供理论依据和科技支撑。本书是我国关于流域气候变化研究系列评估报告中的一本。本书可供中央部委和流域机构以及地方政府决策参考，亦可作为气候气象、水文水资源、生态与环境、社会经济等领域的科研人员和有关大专院校师生的参考书目

春季昌江大型底栖无脊椎动物群落结构及功能摄食类群的空间分布

于2009年4~5月采集鄱阳湖支流昌江的大型底栖无脊椎动物,研究其物种组成及其功能摄食类群的空间分布状况,并通过功能摄食类群组成评价昌江流域河流的生境状况.结果表明:四节蜉、宽基蜉、细蜉和多突癞皮虫为昌江的优势类群,其中四节蜉为昌江流域内4条支流共同的优势类群.冗余分析表明,昌江底栖动物主要受水体中总溶解固体和溶解氧的影响.收集者为昌江各支流主要的功能摄食类群;对昌江流域支流间功能摄食类群参数进行比较发现,指示物质循环方面的参数为昌江干流>北河>东河>大北河,指示物质的纵向输送能力方面的参数为大北河>东河>北河>昌江干流,指示沿岸物质的输入方面的参数为大北河>昌江干流>东河>北河.对各功能摄食类群参数和环境因子进行相关分析,流量的增加会加速河流中沿岸凋落物的输入,水温的升高会加速凋落物的分解,进而会增加河流中有机碳和其他溶解物质的含量

春季昌江大型底栖无脊椎动物群落结构及功能摄食类群的空间分布

于2009年4~5月采集鄱阳湖支流昌江的大型底栖无脊椎动物,研究其物种组成及其功能摄食类群的空间分布状况,并通过功能摄食类群组成评价昌江流域河流的生境状况.结果表明：四节蜉、宽基蜉、细蜉和多突癞皮虫为昌江的优势类群,其中四节蜉为昌江流域内4条支流共同的优势类群.冗余分析表明,昌江底栖动物主要受水体中总溶解固体和溶解氧的影响.收集者为昌江各支流主要的功能摄食类群;对昌江流域支流间功能摄食类群参数进行比较发现,指示物质循环方面的参数为昌江干流〉北河〉东河〉大北河,指示物质的纵向输送能力方面的参数为大北河〉东河〉北河〉昌江干流,指示沿岸物质的输入方面的参数为大北河〉昌江干流〉东河〉北河.对各功能摄食类群参数和环境因子进行相关分析,流量的增加会加速河流中沿岸凋落物的输入,水温的升高会加速凋落物的分解,进而会增加河流中有机碳和其他溶解物质的含量