Results 21 to 30 of about 3,724 (85)

CF3I/N2混合气体中绝缘子沿面闪络特性的研究

open access: yesGaoya dianqi, 2016
文中以SF6/N2混合气体作为比较,研究了CF3I/N2混合气体中绝缘子在工频电压和正、负极性雷电冲击电压下的沿面闪络特性。结果表明:在0.10.3 MPa下,CF3I/N2混合气体中绝缘子的工频闪络电压和雷电冲击闪络电压均随气压升高而增大;在较低气压下,CF3I/N2混合气体中绝缘子的负雷电冲击闪络电压比正极性下要低,而当气压高于某临界值时,负极性下闪络电压又会高于正极性;绝缘子在含30%CF3I气体的CF3I/N2混合气体中的绝缘性能基本介于含20%/30%SF6气体的SF6 ...
张辉, 肖登明, 赵谡, 李冰
doaj  

Trends and Challenges in Water Governance Systematic Review and Bibliographic Study of Scientific Publications (2018–2025)

open access: yesWorld Water Policy, Volume 12, Issue 2, May 2026.
ABSTRACT Water governance has emerged as a critical analytical framework for addressing the complexity of socioecological water systems in contexts of increasing climate vulnerability and anthropogenic pressure. This study presents a systematic review and bibliometric analysis of 50 scientific articles indexed on water governance published between 2018
Roger Pichis‐García   +1 more
wiley   +1 more source

负压气提在高含硫气田采出水脱硫处理中的应用

open access: yesGongye shui chuli, 2021
目前,国内已建高含硫气田均采用“正压气提+密闭氧化除硫”工艺去除气田采出水中的硫化物。该工艺应用过程中由于正压气提对气田采出水中硫化物的去除率低,从而造成吨水处理成本高。为降低处理成本,开展了负压气提工艺现场中试研究,确定了进水pH、气水比、塔内工作压力等最佳工艺参数,出水硫化物去除率达到99%。对YB29污水站进行负压气提工艺改造,整体运行数据与中试试验基本吻合,吨水处理费用降低至56元。
王伟, 朱国, 杨光
doaj   +2 more sources

不同型号气管导管对小儿产生内源性呼气末正压的影响

open access: yesZhongguo shiyan zhenduanxue, 2017
内源性呼气末正压(PEEPi)是指由于呼气气流受限或有效呼气时间不足导致呼气末时肺容积未能回到正常功能残气状态,呼气末时肺泡内压力大于大气压,所产生的正压称为PEEPi[1-6]。目前有相关研究表明 ...
朱冬雪, 杨俏, 金立民, 宋雪松
doaj  

高压自能式SF6断路器空载分闸过程中阀运动特性的仿真分析

open access: yesGaoya dianqi, 2023
高压自能式SF6断路器单向阀、回气阀和泄压阀的运动特性对灭弧室气流场计算结果的准确性具有重要影响。基于3个阀片实际的运动规律,运用牛顿第二定律,建立阀片运动的数学模型,并结合真实气体物性参数,对自能式SF6断路器灭弧室冷态气流场进行仿真,准确获得了3个阀片的运动特性,同时分析了3个阀片的受力特性及阀片周围的压力分布。研究表明,空载情况下,单向阀将对拉杆产生相对运动,这是引起单向阀由闭合到开启状态变化的主要原因,而回气阀移动的主要原因是压气室压力的建立 ...
赵伟涛   +4 more
doaj  

Recent Advances in Piezocatalysis and Piezo‐Photocatalysis in Energy and Environment: Materials, Design, and Applications

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Piezocatalytic technology utilizes mechanical strain or stress‐induced piezoelectric phenomena to produce robust internal electric fields, markedly improving the separation efficiency of e−‐h+ pairs. This method has emerged as a focal point in catalysis by removing reliance on conventional light or electrical energy via its mechanical‐to ...
Yue Zhou   +5 more
wiley   +1 more source

基于SRK状态方程的SF6/CF4混合气体物性参数计算

open access: yesGaoya dianqi, 2016
采用混合气体是解决气体开关设备低温运行的有效途径之一。文中基于真实气体模型,建立SRK状态方程的迭代形式,给出了SF6与CF4气体压力值在0.11 MPa,温度在223323 K范围内压缩因子曲线,分析了温度与压力对压缩因子的影响,给出了不同压力与温度下,SF6与CF4真实气体与理想气体压缩因子的偏离情况,确定混合气体的压缩因子的混合规则,分析了温度与压力对压缩因子的影响,确定混合气体的混合规则,获得了SF6、CF4及混合气体饱和蒸汽压与等密度曲线,得到了混合气体在不同使用条件下的充气与补气方案 ...
钟建英   +4 more
doaj  

Æ E Æ Å – Reshaping the Role of Træna Fishermen

open access: yes, 2022
This diploma project aims to strengthen the viability of Træna’s community by proposing an ocean research facility in the archipelago, enabling the next generation of local fishermen to collect oceanographic data while working at sea. The idea of the fisherman as oceanographer is inextricably linked to the architectural program on the island of ...
openaire   +1 more source

Cobalt‐Based Metal Hybrid Encapsulated Micro‐Aluminum for Tailoring Combustion in Composite Solid Propellants

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT To address the issues of aluminum (Al) powder agglomeration during combustion and low oxidizer decomposition efficiency in composite solid propellants, this study utilized in situ self‐assembly technology to prepare cobalt‐based hybrid‐coated modified Al powder (Al@CZ).
Chong Chen   +11 more
wiley   +1 more source

高真空条件下气压变化对绝缘闪络特性的影响

open access: yesGaoya dianqi, 2005
对纳秒脉冲(10/30ns)下真空绝缘闪络电压随气压的变化趋势进行了实验研究,探讨的气压范围介于8×10-4Pa至标准大气压之间。研究发现,当气压位于高真空区域(10-4~10-1Pa)时,随着气压的改变,绝缘闪络电压无明显变化,基本保持恒定。深入剖析真空环境下的气体解吸附过程,得出如下结论:当气压进入高真空阶段时,表面放气已成为主要气体负荷,所释放气体均源于绝缘体表面的解吸附气体。真空闪络现象,事实上是一种在绝缘体表面气体解吸附后所形成一高气密环境中发生的放电过程。
高巍, 孙广生, 严萍
doaj  

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