Results 31 to 40 of about 10,399 (170)
Study on the Lethal Effect of · OH on Typical Algas in Water Bloom [PDF]
, 2015 我国饮用水源地富营养化加剧，高藻频发，藻类大量繁殖引起的水源污染， 严重地威胁饮用水水质和城市供水。因此饮用水安全问题已成为一项重大的民生 问题，而除藻技术的研发是保障饮用水安全的重要一环。目前虽已有多种较为成 功的藻类控制方法，但都有各自的局限性，还需要寻找更加安全高效的除藻方法。 本研究依托国家科技支撑计划项目，基于大气压强电离放电协同气液混溶技术产 生羟基自由基(OH)的方法，对OH对高藻水源水中的典型水华藻铜绿微囊藻 ...
李芳
core
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 6, Page 706-715, December 2025.ABSTRACT Objective To evaluate the use of twin vs singleton growth charts for detecting small‐for‐gestational‐age (SGA) twins at risk of adverse neonatal outcomes. Methods MEDLINE, EMBASE, CINAHL, Cochrane and Scopus databases were searched electronically from inception to May 2024.
S. Sorrenti +9 more
wiley +1 more source
Gaoya dianqi, 2009 为了研究灭弧室中物性参数的动态特性,笔者对高压SF6断路器在空载状态下压气缸与喷口喉部的压力特性进行了测试,得到压气缸与喷口喉部气体压力的特性曲线。分析了压力变化与开断时间的关系,比较了不同基压下压气缸与喷口喉部气体压力特性的变化,说明了基压对断路器灭弧室内压力的影响。
刘克彬, 林莘
doaj
Bipartisan Failures: How Political Agendas Undermine Core Ethical Principles in Emergency Management
Politics &Policy, Volume 53, Issue 6, December 2025.ABSTRACT This paper examines how political agendas across the ideological spectrum compromise ethical principles in emergency management in the United States. Through a literature review and comparative fact‐based scenario analysis, it demonstrates that both conservative and liberal governments have politicized disaster declarations, resource ...
Erik Xavier Wood
wiley +1 more source
Gaoya 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
Role of Examinations on Phonatory Airflow and Breathing Airflow in Voice Function Assessment [PDF]
, 2015 第一部分s/z比值在嗓音功能评估中的意义 目的：测量正常嗓音组和声带良性增生性疾病组的s/z比值，确定正常嗓音组的s/z比值范围，比较正常嗓音组和声带疾病组的s/z比值有无显著差异，探讨s/z比值对提示诊断声带疾方法：实验对象为正常对照组58例（男：36例，女：22例），疾病组48例（男：23例，女性：25例）。嘱实验对象先深吸气，呼气起始发/s/音（音强控制在65dB左右）至呼气结束停止发音,同一受试者音强大小变化不超过2dB。检查者记录发声时间。同样的方法测量发/z/的时间 ...
潘晗
core
Rare Metals, Volume 44, Issue 11, Page 8161-8197, November 2025.Graphical abstract AbstractThe studies on the synthesis of two‐dimensional (2D) Janus materials have made significant progress over the years. They offer new opportunities to increase the potential usage of Janus transition metal dichalcogenide (TMDC) materials in different application areas due to their unique structural, electrical, optical and ...
Ayça Coşkun +9 more
wiley +1 more source
Gaoya dianqi, 1997 【问】定开距和变开距压气式SF6灭弧室各自的特点是什么? 【答】定开距压气式灭弧室的特点是: （1）开距小,电弧电压低,电弧能量小,对提高开断电流较为有利; （2）压气室离弧区较远,触头间的绝缘强度较高,触头开距可稍小一些; （3）气压室内气体的利用率不如变开距的结构。为了保证足够的气吹时间,压气室的总行程就得增大; （4）压气室内的气体从喷咀内腔向外排出,喷咀的形状和尺寸受到一定的限制。
涟生
doaj
Wear Resistance of Cast Iron Remelted by Non-Transferred Laminar Plasma Jet [PDF]
, 2004 对在大气压条件下用非转移弧层流等离子体射流熔凝强化处理的W-Mo-Cu铸铁表面,采用光学显微镜、显微硬度计、磨损试验机、扫描电镜等,观察和测试了熔凝试样的表面层组织、硬度、耐磨性和磨损形貌.结果表明,熔凝后铸铁表面为初晶渗碳体和莱氏体组成的过共晶组织 ...
潘文霞, 费群星, 马维
core
Bring the Boys Back Home: The Impact of Foreign Divestments on Local Firms
The World Economy, Volume 48, Issue 11, Page 2386-2407, November 2025.ABSTRACT Divestments by foreign multinationals are an important phenomenon that is largely neglected in the literature. We use firm‐level panel data from China to estimate the impact of such divestments on the performance of domestic firms in the local economy.
Holger Görg, Haiou Mao, Nigel Driffield
wiley +1 more source