|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Rapid seismic analysis methodology for in-service wind turbine towers显示文摘The wind energy industry has been growing rapidly during the past decades.Along with this growth,engineering problems have gradually emerged in the wind power industry,including those related to the structural reliability of turbine towers.This study proposes a rapid seismic analysis methodology for existing wind turbine tower structures.The method is demonstrated and validated using a case study on a 1.5 MW tubular steel wind turbine tower.Three finite element(FE)models are developed first.Field tests are conducted to obtain the turbine tower's vibrational characteristics.The tests include(1) remotely measuring the tower vibration frequencies using a long range laser Doppler Vibrometer and(2) monitoring the tower structural vibration by mounting accelerometers along the height of the tubular structure.In-situ measurements are used to validate and update the FE models of the wind turbine tower.With the updated FE model that represents the practical structural conditions,seismic analyses are performed to study the structural failure,which is defined by the steel yielding of the tubular tower.This research is anticipated to benefit the management of the increasing number of wind energy converters by providing an understanding of the seismic assessment of existing tubular steel wind turbine towers. | Dai Kaoshan Huang Yichao Gong Changqing Huang Zhenhua Ren Xiaosong | 2015 | Earthquake Engineering and Engineering Vibration2015，14，3： | 20 |
| 2 | 冷却塔风机驱动水轮机的工作特点与型式选择显示文摘工业冷却塔风机驱动用水轮机的工作环境与发电专用的水轮机有很大不同,它要在串联的有压水流系统中工作,并有典型的超低比转速特性,这些特点决定了水轮机型式和参数的选择。所推荐的水轮机参数可为冷却塔专用水轮机设计提供参考。 | 陈德新 张文俊 阳莉 | 2010 | 水力发电2010，36，12： | 11 |
| 3 | Efficacy and Safety of Teriflunomide in Chinese Patients with Relapsing Forms of Multiple Sclerosis: A Subgroup Analysis of the Phase 3 TOWER Study显示文摘Background:Disease-modifying therapy is the standard treatment for patients with multiple sclerosis (MS)in remission.The primary objective of the current analysis was to assess the efficacy and safety of two teriflunomide doses (7mg and 14mg)in the subgroup of Chinese patients with relapsing MS included in the TOWER study. Methods:TOWER was a multicenter,multinational,randomized, double-blind,parallel-group (three groups),placebo-controlled study.This subgroup analysis includes 148 Chinese patients randomized to receive either teriflunomide 7mg (n =51), teriflunomide 14mg (n=43),or placebo (n=54). Results:Of the 148patients in the intent-to-treat population, adjusted annualized-relapse rates were 0.63(95% confidence interval [CI]:0.44,0.92)in the placebo group,0.48(95%CI:0.33, 0.70)in the teriflunomide 7mg group,and 0.18(95%CI:0.09,0.36)in the terifltmomide 14mg group;this corresponded to a significant relative risk reduction in the teriflunomide 14mg group versus placebo (-71.2%,P =0.0012).Terifiunomide 14mg also tended to reduce 12-week confirmed disability worsening by 68.1% compared with placebo (hazard ratio:0.319,P =0.1194).There were no differences across all treatment groups in the proportion of patients with treatment-emergent adverse events (TEAEs;72.2% in the placebo group,74.5%in the teriflunomide 7mg group,and 69.8% in the teriflunomide 14mg group);corresponding proportions for serious adverse events were 11.1%,3.9%,and 11.6%,respectively.The most frequently reported TEAEs with teriflunomide versus placebo were neutropenia,increased alanine aminotransferase,and hair thinning. Conclusions:Teriflunomide was as effective and safe in the Chinese subpopulation as it was in the overall population of patients in the TOWER trial.Teriflunomide has the potential to meet unmet medical needs for MS patients in China. | Wei Qiu De-Hui Huang Shi-Fang Hou Mei-Ni Zhang Tao Jin Hui-Qing Dong Hua Peng Chao-Dong Zhang Gang Zhao Yi-Ning Huang Dong Zhou Wei-Ping Wu Bao-Jun Wang Ji-Mei Li Xing-Hu Zhang Yan Cheng Hai-Feng Li Ling Li Chuan-Zhen Lu Xu Zhang Bi-Tao Bu Wan-Li Dong Dong-Sheng Fan Xue-Qiang Hu Xian-Hao Xu | 2018 | Chinese Medical Journal2018，，23： | 10 |
| 4 | Tower支持下的App混合式学习研究——以“学习科学与技术”课程为例显示文摘文章从Tower支持创建团队、发布任务、协作讨论等功能出发,以'学习科学与技术'课程为例,构建了Tower支持下的App混合式学习模式,设计了基于该模式的教学实施流程,验证了Tower支持下的App混合式学习能有效地促进教学和学习,为相关领域的理论和实践研究提供了借鉴。 | 王云 苑新美 | 2016 | 现代教育技术2016，26，6： | 8 |
| 5 | Some key technics of drop tower experiment device of National Microgravity Laboratory (China) (NMLC)显示文摘Drop tower is an important ground based facility for microgravity science experiment. The technical performances of the drop tower NMLC are advanced compared with similar facilities in the US, Germany and Japan. The main components such as drop capsule, deceleration devices, release mechanism present its advantages and creativities. | ZHANG Xiaoqian 1 , YUAN Longgen 1 , WU Wendong 1 , TIAN Lanqiao 2 & YAO Kangzhuang 2 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China 2. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China | 2005 | Science China(Technological Sciences)2005，48，3： | 4 |
| 6 | Full scale experimental study of a small natural draft dry cooling tower for concentrating solar thermal power plant显示文摘Concentrating solar thermal power system can provide low carbon,renewable energy resources in countries or regions with strong solar irradiation.For this kind of power plant which is likely to be located in the arid area,natural draft dry cooling tower is a promising choice.To develop the experimental studies on small cooling tower,a 20 m high natural draft dry cooling tower with fully instrumented measurement system was established by the Queensland Geothermal Energy Centre of Excellence.The performance of this cooling tower was measured with the constant heat input of 600 kW and 840 kW and with ambient temperature ranging from 20 ℃ to 32 ℃.The cooling tower numerical model was refined and validated with the experimental data.The model of 1 MW concentrating solar thermal supercritical CO2 power cycle was developed and integrated with the cooling tower model.The influences of changing ambient temperature and the performance of the cooling tower on efficiency of the power system were simulated.The differences of the mechanism of the ambient temperature effect on Rankine cycle and supercritical CO2 Brayton cycle were analysed and discussed. | Xiaoxiao Li Sam Duniam Hal Gurgenci Zhiqiang Guan Anand Veeraragavan 侯恩哲 | 2017 | 建筑节能2017，45，5： | 4 |
| 7 | Three-dimensional Numerical Study on Thermal Performance of a Super Large Natural Draft Cooling Tower of 220m Height显示文摘Based on the heat and mass transfer theory and the characteristics of general-purpose software FLUENT, a three-dimensional numerical simulation platform, composed of lots of user defined functions(UDF), has been developed to simulate the thermal performance of natural draft wet cooling towers(NDWCTs). After validation, this platform is used to analyse thermal performances of a 220m high super large cooling tower designed for inland nuclear plant under different operational conditions. Variations of outlet temperature of the cooling tower caused by changes of water flow rates, inlet water temperatures are investigated. Effects of optimization through non-uniform water distributions on outlet water temperature are discussed, and the influences on the flow field inside the cooling tower are analyzed in detail. It is found that the outlet water temperature will increase as the water flow rate increases, but the air flow rate will decrease. The outlet water temperature will decrease 0.095K and 0.205K, respectively, if two non-uniform water distribution approaches are applied. | JIN Tai ZHANG Li LUO Kun FAN Jianren | 2013 | Journal of Thermal Science2013，22，3： | 4 |
| 8 | 基于Tower的翻转课堂教学模式及其应用研究——以“网络学习共同体”为视角显示文摘随着互联网与教育不断融合,翻转课堂为提高学习者的学习动机和学习效果创造了新的契机。文章在分析翻转课堂与网络学习共同体关系及Tower的功能特点的基础上,提出了基于Tower的翻转课堂教学模式,并将此模式应用到教学过程中。研究表明,在基于Tower的翻转课堂中,师生角色有所转变,交互程度有所提升,并且高效完成了知识共享和转移;但同时也发现,学习者参与度较低、自主思考能力较薄弱、教师角色定位不明确等因素会对共同体的学习效果产生负面影响。为此,文中有针对性地提出了改进建议。 | 汪存友 陕纳青 | 2017 | 中国教育信息化2017，23，16： | 3 |
| 9 | 新世代办公室 Horwath公司室内设计显示文摘 | 无 小麦(编译) | 2007 | 室内设计与装修2007，，1： | 2 |
| 10 | Random walk modeling of wake dispersion for the exhaust tower of an underground tunnel in urban area显示文摘In this paper, some experimental studies on the impact of effluent from an exhaust tower of an underground tunnel with special construction are reported. By measuring the flow field downstream of the tower in NJU meteorological wind tunnel, some flow characteristics in the make area were established. Based on these, an advanced random\|walk dispersion model was set up and applied successfully to the simulation of dispersion in the wake area. The modelling results were in accordance with wind tunnel measurements. The computed maximum of ground surface concentration in the building case was a factor of 3-4 higher than that in the flat case and appeared much closer to the source. The simulation indicated that random walk modelling is an effective and practical tool for the wake stream impact assessment. | JIANG Wei\|mei\+1, YU Hong\|bin\+1, LI Xin\+2 (1.Department of Atmospheric Sciences, Nanjing University, Nanjing 210093, China 2.LAPC, Institute of Atmospheric Physics,Chinese Academy of Sciences, Beijing 100029, China) | 1999 | Journal of Environmental Sciences1999，11，4： | 2 |
| 11 | The changing process and trend of ground temperature around tower foundations of Qinghai-Tibet Power Transmission line显示文摘After the construction of Qinghai-Tibet Highway and Railway, the Qinghai-Tibet Power Transmission(QTPT) line is another major permafrost engineering project with new types of engineering structures. The changing process and trend of ground temperature around tower foundations are crucial for the stability of QTPT. We analyzed the change characteristics and tendencies of the ground temperature based on field monitoring data from 2010 to 2014. The results reveal that soil around the tower foundations froze and connected with the artificial permafrost induced during the construction of footings after the first freezing period, and the soil below the original permafrost table kept freezing in subsequent thawing periods. The ground temperature lowered to that of natural fields, fast or slowly for tower foundations with thermosyphons,while for tower foundations without thermosyphons, the increase in ground temperature resulted in higher temperature than that of natural fields. Also, the permafrost temperature and ice content are significant factors that influence the ground temperature around tower foundations. Specifically, the ground temperature around tower foundations in warm and ice-rich permafrost regions decreased slowly, while that in cold and ice poor permafrost regions cooled faster. Moreover, foundations types impacted the ground temperature, which consisted of different technical processes during construction and variant of tower footing structures. The revealed changing process and trend of the ground temperature is beneficial for evaluating the thermal regime evolution around tower foundations in the context of climate change. | YanLi Xie QiHao Yu YanHui You ZhongQiu Zhang TingTao Gou | 2019 | Research in Cold and Arid Regions2019，11，1： | 2 |
| 12 | NUMERICAL INVESTIGATION OF THE ADVERSE EFFECT OF WIND ON THE HEAT TRANSFER PERFORMANCE OF TWO NATURAL DRAFT COOLING TOWERS IN TANDEM ARRANGEMENT显示文摘This article reports the findings on the adverse effect of the crosswindon the performance of natural draft cooling towers through numerical computationwith the k-ε eddy-viscosity turbulence model. It is observed here that the cause ofthe adverse effect of the crosswind on the cooling towers can be attributed to thearound flow effect which destroys the radial inflow into the cooling towers when thewind is absent. Hence, a significant deterioration in the heat transfer from the heatexchangers at lateral sides occurs. | 符松 翟志强 | 2001 | Acta Mechanica Sinica2001，17，1： | 2 |
| 13 | Influence of rooftop telecommunication tower on set back-step back building resting on different ground slopes显示文摘In the hilly region due to scarcity of the plain area, buildings like set back-step back are more often used and also as a big surge in the telecommunication industries, rooftop tower adaptation is very common story nowadays. In the present study an analogy has been drawn to find out the influence of the rooftop telecommunication tower on the setback-step back building resting on ground at 20° and 30° slopes. A dynamic analysis has been performed and compared on the 4 legged angled section telecommunication tower which is located on the roof top of set back-step back building by varying positions of tower with the existing host structure built up on ground slope of 20° and 30° in both directions(X and Y). | Amit Thakur Deepankar Kumar Ashish Surender Kumar Verma | 2019 | Earthquake Engineering and Engineering Vibration2019，18，2： | 1 |
| 14 | 上海世界博览会规划设计显示文摘由东南大学建筑学院与美国35设计组联合完成的“中国2010年上海世界博览会规划设计方案”荣获Architectural Review杂志2004年城市景观设计二项大奖(Cityscape 2004 Architectural Review Rewards),它们分别是总体规划设计(Master Planning for World Expo 2010 Shanghai China)与世博文化塔设计(People's Tower for World Expo 2010 Shanghai China),是本次评奖中唯一同时获得两项大奖的设计方案。 | 王建国 张彤 | 2005 | 世界建筑导报(设计论谈)2005，，2： | 1 |
| 15 | Dong Nationality Architect of God | Cynthia | 2002 | 中国周刊2002，34，6： | 1 |
| 16 | Experimental Study on Performance of a Closed Wet Cooling Tower for Air Wet-Bulb Temperature near 0°C显示文摘Closed wet cooling towers(CWCTs) are used widely because of their better water quality and smaller water consumption. However, the operating parameters shown in the technical documents are only for rated conditions in summer, not for any other conditions, especially in low air wet-bulb temperature areas such as those near 0℃. In addition, CWCTs often fail to achieve the designed cooling effect at low air wet-bulb temperatures. A experiment set of CWCT was built, and the performance of the CWCT at low air wet-bulb temperature near 0℃ was investigated. The impact of the operating parameters(air flow rate, cooling water flow rate, and spray water flow rate) on the heat and mass transfer performance of the CWCT was measured and analyzed. The results show the cooling performance of the CWCT at an air wet-bulb temperature 0℃, 2℃, and 4℃ is about 47%–63% of the rated operating condition;the optimal operating parameters of these conditions for the CWCT are just the same as those of the rated operating condition in summer. According to the experimental results, some operating advices are given. | ZHOU Yasu ZHANG Pan ZHAO Jingde YANG Honghai BAI Yufeng | 2019 | Journal of Thermal Science2019，28，5： | 1 |
| 17 | A summary of the live-line work on 500 kV transmission lines in China显示文摘According to the power system planning in China,500kV transmission line will be the trunks in all regionalnetworks except the Northwest China System.Due to short ofcapital resources,however,most of those 500 kV transmissionlines are and will be operating in single circuit for quite a long pe-riod of time.So,to use the live working techniques on 500 kVlines is an important problem for study.Actually,we had already begun our study on live workingon 500 kV transmission line several years prior to the | Li Hongren China Technical Centre of Live-line Work | 1992 | Electricity1992，，4： | 1 |
| 18 | Smart Semi-active PID-ACO control strategy for tower vibration reduction in Wind Turbines with MR damper显示文摘Wind turbine technology is well known around the globe as an eco-friendly and eff ective renewable power source. However, this technology often faces reliability problems due to structural vibration. This study proposes a smart semi-active vibration control system using Magnetorheological (MR) dampers where feedback controllers are optimized with nature-inspired algorithms. Proportional integral derivative (PID) and Proportional integral (PI) controllers are designed to achieve the optimal desired force and current input for MR the damper. PID control parameters are optimized using an Ant colony optimization (ACO) algorithm. The eff ectiveness of the ACO algorithm is validated by comparing its performance with Ziegler-Nichols (Z-N) and particle swarm optimization (PSO). The placement of the MR damper on the tower is also investigated to ensure structural balance and optimal desired force from the MR damper. The simulation results show that the proposed semi-active PID-ACO control strategy can signifi cantly reduce vibration on the wind turbine tower under diff erent frequencies (i.e., 67%, 73%, 79% and 34.4% at 2 Hz, 3 Hz, 4.6 Hz and 6 Hz, respectively) and amplitudes (i.e. 50%, 58% and 67% for 50 N, 80 N, and 100 N, respectively). In this study, the simulation model is validated with an experimental study in terms of natural frequency, mode shape and uncontrolled response at the 1st mode. The proposed PID-ACO control strategy and optimal MR damper position is also implemented on a lab-scaled wind turbine tower model. The results show that the vibration reduction rate is 66% and 73% in the experimental and simulation study, respectively, at the 1st mode. | Mahmudur Rahman Zhi Chao Ong Wen Tong Chong Sabariah Julai | 2019 | Earthquake Engineering and Engineering Vibration2019，18，4： | 1 |
| 19 | 基于tower的研究生协作学习环境构建探索显示文摘随着研究生教育的规模快速增长,非全日制占比增加,研究生网络协作学习是必然趋势,当前的协作学习流于形式缺乏高效协作。本文将分析介绍Tower作为研究生协作学习平台的特性,分析基于Tower的研究生协作学习环境涵义及其构成因素,利用Tower的各项协作功能强化积极协作学习行为,保证协作学习有效性。 | 董佳 | 2018 | 信息技术与信息化2018，，2： | 1 |
| 20 | 水塔之家,上海,中国显示文摘在地的实验梦想改造家之水塔的家位于金陵东路389弄23号顶层,系1980年代改建落成于1920年代的水塔而成。面积39m^2,两层,内部用爬梯联系。厨房占用楼梯,屋子年久失修,已经破败不堪,犹如废墟。建筑师把水塔之家看成一个复杂系统,这个复杂系统在空间领域上其实等于一个新房子插在旧的结构系统上。在里面,设计师重新组织了功能布局。 | YU Ting&Wutopia Lab | 2016 | 世界建筑2016，，4： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员