Results 31 to 40 of about 11,755 (121)

流花11-1油田水下采油树测试方法研究

Shiyou jixie, 2015
为了对新服役和维修后再役的水下采油树进行性能测试，对水下采油树系统结构和工作原理进行了研究，参照API相关标准及水下采油树工厂验收测试步骤，结合流花11-1油田水下采油树的特点，制定了一套水下采油树测试方法和流程。水下采油树测试项目包括：水下采油树本体测试、密封轴套测试、油管挂测试、采油树帽测试及采油树系统功能联合测试。测试过程中判断保压效果的标准是没有明显的泄漏，且在规定的保压时间内压降不应超过初始压力的3%。该测试方法的制定对于解决国内油田水下采油树的检测维修问题具有重要的现实意义 ...
袁晓兵, 欧宇钧, 卢沛伟, 罗玉贵, 杨文, 苏瑞华, 蔡宝平   +6 more
doaj  

Combating infections under siege: Healthcare challenges amidst the military assault in Gaza

World Medical &Health Policy, Volume 17, Issue 1, Page 188-213, March 2025.
Abstract The ongoing Israeli military assault on Gaza has caused a devastating collapse of healthcare infrastructure, resulting in an unprecedented surge in infectious diseases. The destruction of sanitation systems, restrictions on medical supplies, and displacement of civilians have created an environment conducive to the rapid spread of waterborne ...
Bilal Irfan, Izzeddin Lulu, Adam Hamawy, Abdallah Abu Shammala, Susan Kullab, Mohamed Fawaz, Abd Al‐Karim Sammour, Haseeb Khawaja, Nour Alshaer, Ghassan Abu‐Sittah, Osaid Alser, Mark Perlmutter, Anas Al‐Shembari, Jeremy Hickey, Tariq Nayfeh, Mohammed Tahir, Muhammad Junaid Sultan, Elias Nasser, Muaaz Wajahath, Aneela Yaqoob, Ahmad Hasan, Ali Elaydi, Abdullah Ghali, Mosab Nasser, Khaled J. Saleh   +24 more
wiley   +1 more source

基于多源GPP和ET产品的秦岭生态系统水分利用效率研究

Shuitu Baochi Xuebao, 2022
通过评价多种生态系统总初级生产力(gross primary productivity,GPP)和蒸散(evapotranspiration,ET)遥感数据产品,构建了适用于我国秦岭区域的GPP和ET组合数据集,并计算分析了秦岭区域生态系统水分利用效率(water use efficiency,WUE)的时空变化规律。结果表明:不同产品对于不同植被类型GPP和ET的估算效果差异较大,其中VPM GPP和RF GPP这2种GPP产品,China ET和PML-V2 ET这2种ET产品的总体表现较好 ...
黄卓, 曹银轩, 徐喜娟, 陈上, 冯浩, 王钊, 于强, 何建强   +7 more
doaj  

Systematic review of the impact of restrictive wildlife trade measures on conservation of iconic species in southern Africa

Conservation Biology, Volume 39, Issue 1, February 2025.
Abstract Trade restrictions are often advocated and implemented as measures to protect wild species threatened by overexploitation. However, in some instances, their efficacy has been questioned, notably by governments in the southern African (SADC) region, which tend to favor a sustainable use approach to wildlife management. We conducted a systematic
Christina Hiller, Michael ’t Sas‐Rolfes   +1 more
wiley   +1 more source

Prospects for conserving freshwater fish biodiversity in the Anthropocene: A view from Southern China 人类世下淡水鱼类生物多样性保护的前景:以中国南方为视角

Integrative Conservation, Volume 3, Issue 4, Page 294-311, December 2024.
Freshwater biodiversity in China is threatened by multiple anthropogenic factors, and while there are some reasons to suppose it may be possible to bend the curve of biodiversity loss, the variety of threats and their likely interactions with ongoing climate change provide little basis for optimism. For example, the historic overexploitation of Yangtze
David Dudgeon
wiley   +1 more source

天广直流逆变侧直流电压测量偏低故障时直流系统响应特性仿真研究

Gaoya dianqi, 2016
近期天广直流多次发生因逆变侧直流电压测量偏低故障导致直流系统电压异常升高的事件。为了研究这一事件的产生机理,结合控制策略对天广直流系统电压异常升高的原因进行了详细分析,并通过大量RTDS仿真试验,研究了在不同故障程度、功率水平、运行方式下发生逆变侧直流电压测量偏低故障时直流系统的过压水平和控制保护响应特性。仿真结果表明,逆变侧直流电压测量偏低会造成直流系统过压,且直流系统在不同的故障程度、功率水平和运行方式下有不同的控制保护特性,特别是在大功率模式和降压运行方式下可降低直流过压水平。
郑永武, 黄修作
doaj  

Fetal lower urinary tract obstruction: international Delphi consensus on management and core outcome set

Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 5, Page 635-650, November 2024.
ABSTRACT Objectives To reach an international expert consensus on the diagnosis, prognosis and management of fetal lower urinary tract obstruction (LUTO) by means of a Delphi procedure, and to use this to define a core outcome set (COS). Methods A three‐round Delphi procedure was conducted among an international panel of experts in fetal LUTO.
H. J. Mustafa, A. Khalil, S. Johnson, S. J. Gordijn, W. Ganzevoort, C. Melling, C. J. Koh, G. T. Mandy, M. D. Kilby, A. Johnson, R. A. Quintero, G. Ryan, A. A. Shamshirsaz, A. A. Nassr, on behalf of the LUTO Working Group, Aris Papageorgiou, Ahmet Baschat, Amarnath Bhide, Alexandra Benachi, Alexandre Vivanti, Andrew Breeze, Anthony Odibo, Annemieke Middeldorp, Armando Lorenzo, Bidyut Kumar, Caterina Bilardo, Caroline Bax, Caroline Jones, Christopher Harman, Christoph Lees, Douglas E Coplen, Dilly Anumba, Dick Oepkes, Devender Roberts, Eva Pajkrt, Emma Ferriman, Eyal Krispin, Fionnuala Mone, Federica Fontanella, Fiona McAndrew, Fionnuala Mcauliffe, George Attilakos, Harriet Corbett, Ingeborg Linskens, Josine Quaedackers, Janice Gibson, Jimmy Espinoza, Jena Miller, Jose Peiro, Justin Kim, Katerina Prodromou, Katie Morris, Ka Wang Cheung, Kenneth Moise, Lukas Van Den Haak, Magdalena Sanz Cortes, Mandy Rickard, Marcella Pellegrino, Marco Desantis, Massimo Garriboli, Matko Marlais, Matthew Peycelon, Mesiha Ekim, Mireille Bekker, Michael Belfort, Michael Braun, Mert Bahtiyar, Michael Zaretsky, Mounira Habli, Nicolas Sannes, Oluyinka Olutoye, Ozhan Turan, Phebe N. Adama van Scheltema, Pallavi Prasad, Pranav Pandya, Raffaele Napolitano, Rogelio Cruz, Rita Swinford, Ruwan Wimalasundera, Simon Cunningham, Sina Haeri, Stephen Emery, Srividhya Sankaran, Surabhi Nanda, Tayfun Oktar, Tommy Mousa, Umber Agrawal, Valentina Gracchi, Valeska Bidault, William Goodnight, Yair Blumenfeld   +90 more
wiley   +1 more source

Dams in intrastate ethnic conflict: A comparison of Turkey and Ethiopia

World Water Policy, Volume 10, Issue 4, Page 1044-1065, November 2024.
Abstract Why do dams exacerbate ethnic conflict in Turkey but not in Ethiopia? This paper analyzes the impacts of a growing push to develop water resources through hydroelectric dams, which promise clean energy, jobs, and economic opportunities. Yet dam building also causes environmental degradation, mass relocation, the flooding of historical sites ...
Alex Bezahler
wiley   +1 more source

一种水下光通信中基于先验模型的预均衡方法

Guangtongxin yanjiu, 2021
由于海水的散射特性，光在水下传输时会产生码间串扰（ISI）问题，传输环境较差时尤为严重。为解决该问题，文章将预均衡技术应用于基于直流偏置光正交频分复用（DCO-OFDM）调制的水下光通信系统中，并针对水下光的传输特性提出了一种基于先验信息的预均衡方法。在浑浊海港海水环境下与传统均衡算法进行了性能对比。仿真结果表明，在信噪比（SNR）较差的情况下，采用所提方法能够有效降低水下光通信系统的ISI，降低了误码可能性，提高了信道估计的可靠性。相比于最小二乘（LS）后均衡算法，误码率能下降约3.56 dB ...
张磊, 敖珺, 石俊杰
doaj  

Demographic and net primary productivity dynamics of primary and secondary tropical forests in Southwest China under a changing climate 气候变化背景下中国西南热带原始林和次生林的群落和净初级生产力动态研究

Integrative Conservation, Volume 3, Issue 3, Page 230-243, September 2024.
Tropical secondary forest at early sucessional stage had higher diamter growth rate and mortality rate, however, these forests also are more risked to droughts and high temperatures. Rising temperatures and more frequent droughts may decrease the carbon sink capacity of tropical forest ecosystems. Abstract Tropical forests are major carbon sinks on the
Sai Tun Tun Oo, Shankar Panthi, Ze‐Xin Fan, Xiao‐Yang Song, Huanyuan Zhang‐Zheng, Zaw Zaw, Hua‐Zheng Lu, Hui Chen, Yun Deng, Rong Zhao, Hua Lin, Pei‐Li Fu   +11 more
wiley   +1 more source