Results 31 to 40 of about 14,295 (168)
Dianci bileiqi, 2018 风力机非常容易受到雷电袭击,因此保证风力机安全可靠的运行至关重要,风力机雷电保护的首要步骤是分析风机雷电流分布,基于实际工程中风力发电机结构和相关运行标准,将其几何和材料参数转换为EMTP-ATP软件中的等效电路模型,计算并分析风机雷电流分布和内部过电压问题。针对由于雷电直击风机转子叶片在其内部造成的电压应力问题,通过仿真计算分析了风机电气、IT系统的多种不同类型的过电压,仿真包涵了全变流风力机的电力电子器件分析。最后根据行业标准,通过依次添加保护装置的方法提出了在风力机通信、电气系统、杆塔塔顶 ...
高参, 毛凯, 张冬谊, 蒯雷
doaj
Treatment of was tewater from jeans production by hydrolytic acidification /biological contact oxidation /sedimentation [PDF]
, 2007 [摘要]：针对牛仔衣染色( 以靛蓝染料为主) 废水色度较高、有毒性及污染严重的特点, 确定采用水解酸化/生物 接触氧化/沉淀的工艺处理该废水。在丽发制衣厂的应用实践表明: 该工艺切实可行, 运行费用低, 处理效果稳定, 出 水水质达到DB 44 /26—2001 中一级排放标准, COD、BOD5、SS、色度去除率分别达到94%、92%、87%、83%。[Abstract]:The wastewater fromjeans production(mainly containing indigo ...
Chen Hang +7 more
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Conservation Biology, EarlyView.Abstract The design of experiments to investigate the combined effects of multiple stressors requires exposing target organisms to multiple combinations of stressor doses. Concurrent manipulation of stressors is often infeasible with wildlife, but long‐lasting health effects allow individual health to be used as an integrator of prior stressor exposure.
Enrico Pirotta +24 more
wiley +1 more source
Study on Optimization of Purchasing Management for Company Y [PDF]
, 2016 在复杂多变的市场环境下，企业要想在激烈的市场竞争中生存，就必须制定符合自身的战略，获得竞争优势。采购是供应链中的重要一环，影响整个企业的生产过程，是保障生产流畅的重要前提。采购管理是企业生产经营管理活动的出发点，对企业的成本和利润产生直接影响。通过采购管理优化，能够帮助企业达到降低采购成本，改进供应商质量的目的，对企业来说是非常重要的。 本文以优化Y公司的采购管理为指导，对Y公司采购管理活动进行了深入的分析，剖析了Y公司在采购管理活动中存在的各类问题，并借助系统化的优化方法提出了Y公司采购管理优化方案 ...
卢绍红
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Thermoelectric Generation in Home Appliance-ID-05011 [PDF]
, 2021 The invention applies a thermoelectric generator (TEG) to devices/home appliances for enhancing improve power consumption. The TEG converts thermal energy into electric current based on the difference of temperature gradient of the TEG materials with ...
Mohr, Christian
core +1 more source
Conservation Biology, EarlyView.Abstract Achieving global conservation policy goals requires the ability to set and measure progress toward science‐based targets for biodiversity. The species threat abatement and restoration (STAR) metric was developed to enable actors to set science‐based targets for species.
Louise Mair +17 more
wiley +1 more source
Dianci bileiqi, 2019 随着大规模风电在电力系统中的日益普及,风机桨叶的雷击灾害问题愈加严重。本文针对该问题,首先从风机系统外部分析桨叶与雷云间上行先导的放电机理和旋转桨叶的引雷效应,然后从风机系统内部阐述风机结构及旋转桨叶对雷电流暂态行波的影响,并研究新型碳纤维复合材料对直击雷能量耗散的作用,同时简要说明感应雷对风电机组的危害,分析归纳出风机桨叶遭受雷击时产生的主要问题。结果表明,忽略风机桨叶上行雷的雷击次数会严重低估雷击事故率,桨叶旋转运动可使叶片引雷能力增强,同时风机桨叶运动特性会对雷电流折、反射系数产生较大影响 ...
谭启德 +4 more
doaj
Control strategy research for PV DC microgrid with hybrid storage system [PDF]
, 2016 以光伏、风电等可再生能源为主的分布式发电技术因为其随机性、不稳定性，对配电网潮流改变带来的安全性等问题，其发展得到一定的制约。微电网被广泛认为是解决分布式发电技术应用瓶颈的有效解决方案，而直流微电网以直流形式传输电能，控制结构简单，不需考虑频率和相位，系统损耗小，效率高，也更加适合越来越多的直流电器的接入，因此具有很强的推广实用价值。本文在研究了直流微电网的国内外研究发展现状、架构，以及包括控制技术、储能技术、保护技术等关键技术基础上，对包含有蓄电池和超级电容器在内的光伏直流微电网系统进行了研究 ...
杨贇
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Selection and Design of Wind Turbine Foundation for an Offshore Wind Farm [PDF]
, 2023 [Introduction] From 2022, the state subsidies for offshore wind power has been fully withdrawn. The foundation of offshore wind turbines is the supporting structure of wind turbines and plays a crucial role in the safe operation of offshore wind farms ...
Baoyang LI
core +1 more source
Drivers of bat researchers’ intent to adopt field hygiene practices
Conservation Biology, EarlyView.Abstract Infectious disease is a growing threat to wildlife, with zoonotic transmission most likely at the human–wildlife interface. One underappreciated activity at this interface is fieldwork with wild animals, but associated risks can be mitigated through field hygiene (FH) practices, such as using personal protective equipment and other appropriate
Joanna L. Coleman +6 more
wiley +1 more source