Results 51 to 60 of about 21,875 (198)

表面水滴对交流导线电晕特性的影响

open access: yesGaoya dianqi, 2015
雨天条件下,输电线路导线表面形成的水滴会畸变导线周围电场,从而改变导线的电晕特性。笔者基于实验室小电晕笼,利用实验室研发的电晕损失测量系统,测量了不同水滴等级(水膜、一滴水、中等水滴、饱和水滴)下导线的电晕损失,获得了表面水滴对导线电晕起始特性的影响规律。同时,笔者针对自然界中雨水电导率的差异,研究了不同的水滴电导率对电晕放电特性的影响。结果表明:水滴的存在严重影响了导线在交流电压下的电晕损失特性,相同电压作用下,表面附着水滴的导线电晕损失比干净导线电晕损失大得多,且随着水滴等级的提高而增加 ...
朱军   +5 more
doaj  

Metadiscourse and Teacher Moves for Supporting Student Reasoning in Linguistics Classroom Interactions

open access: yesInternational Journal of Applied Linguistics, Volume 36, Issue 1, Page 522-539, February 2026.
ABSTRACT This paper examines the features of metadiscourse across different teacher moves in university linguistics classroom discourse and the teaching strategies reflected in its use. The results reveal that teachers employ diverse metadiscourse during classroom interactions to support student reasoning.
Jingjie Li, Wenjie Hu
wiley   +1 more source

Study on the Preparation of Solvent Hot-Melt Adhesive Used for Polyethylene [PDF]

open access: yes, 2016
热熔胶相比于其他胶黏剂优点突出,应用广泛。而随着各种新型产业的发展,尤其是热转印行业,对热熔胶品种需求扩大,溶剂型热熔胶应运而生,其中聚乙烯(PE)作为应用最为广泛的难粘通用塑料,其许多制品对溶剂型热熔胶存在需求。但目前我国对溶剂型热熔胶的研发投入少,产品多依赖进口,价格偏高,且依然存在对PE粘接针对性不足,粘接强度较低等问题。本文以乙烯-丙烯酸乙酯共聚物(EEA)为主体材料,对其进行物理和化学改性,致力于研制出对PE具有较高粘接强度的溶剂型热熔胶黏剂配方。 首先,本文对EEA、乙烯-醋酸乙烯酯共聚物 ...
薛惠芸
core  

基于灰关联分析微气象因素和导线温度对输电线路导线覆冰的影响

open access: yesGaoya dianqi, 2011
输电线路导线覆冰不仅与微气象条件有关,而且与导线温度有关。针对目前微气象因素与覆冰的相关性分析不全面、不系统,且部分研究没有考虑导线温度对覆冰的影响,无法确定输电线路导线覆冰的主要影响因素等问题,笔者统计了贵州电网220kV铜黎线路和220kV鸡阳二回线路覆冰监测数据,采用灰关联方法分析了输电线路导线覆冰与微气象条件(环境温度、环境湿度、环境风速)和导线温度等因素之间的关系,确定了该两条输电线路导线覆冰和上述4个因素之间的关联度,找出影响导线覆冰的主要因素。结果表明 ...
欧阳丽莎, 黄新波
doaj  

Injectable Biomimetic Composite Hydrogel Scaffold With Tissue‐Engineered Cartilage Matrix for Articular Cartilage Regeneration

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Articular cartilage regeneration remains a significant challenge because of its limited intrinsic healing capacity and the inadequacy of conventional treatments for restoring structural and functional integrity. In this study, a novel injectable composite hydrogel scaffold was designed to mimic the extracellular matrix (ECM) of native ...
Zhong‐Lian Wu   +13 more
wiley   +1 more source

Research on the Intrinsically Packaged LC Wireless Pressure Sensor [PDF]

open access: yes, 2016
LC谐振无线压力传感器采用无线无源方式实现对压力信号的检测,适用于狭小封闭的空间以及高温、腐蚀的恶劣环境,在生物医疗、航空航天、工业控制等领域具有广阔的应用前景。目前,国内主要采用LTCC、HTCC技术制备LC谐振无线压力传感器,其敏感元件尺寸大,灵敏度低,且电感线圈制作在结构外部,容易受外部环境破坏,降低了传感器的实用性。而采用MEMS技术能够制备小尺寸、高灵敏度、内嵌式的LC谐振无线压力传感器,提高LC谐振无线压力传感器的实用性。因此,本论文提出并实现一种基于MEMS技术的LC内嵌式无线压力传感器 ...
郑成
core  

Endogenous/Exogenous Dual‐Responsive Bimetallic Hollow Nanozyme for Photothermal/Nanocatalysis/Immune Synergistic Tumor Therapy

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Nanozymes have attracted considerable attention in cancer therapy due to their adjustable enzyme activity and high catalytic efficiency. However, they still face a major challenge from tumor metastasis. In this work, endogenous/exogenous dual‐responsive bimetallic hollow PdRu (termed HPdRu) nanozymes were prepared.
Nan‐Nan Zheng, Xin Hu, Jun‐Qing Hu
wiley   +1 more source

Electric Hot Assisted Turning and Its Process Monitoring [PDF]

open access: yes, 2015
近年来,机械加工行业中出现了大量耐高温、强度高、硬度大的难加工材料。在这些材料的加工过程中,普遍存在着切削力大、刀具磨损严重、表面质量差等问题。用常规的刀具材料和加工方法很难进行切削加工,也达不到现代工业技术的要求。随着历史的发展,人们提出了许多针对这些难加工材料的加工思路和方法,加热切削就是比较好的思路,而导电加热切削则是其中一种行之有效的方法。 本文对现有导电加热切削技术做出了一些研究,提出了通电加热辅助车削的方法,意在探寻这种方法的可行性和效果。通电加热辅助车削是把低压大电流通入到由电源 ...
张天宇
core  

Energy Engineering in Amorphous Alloys: Harnessing Fictive Temperature for Improved Corrosion Resistance

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT In this study, an in‐depth investigation was carried out to elucidate the energy and structural modifications in connection with the property of corrosion resistance. The strategy is to employ the fictive temperature (Tf) as the indicator of the energy state of amorphous alloys.
Liang Yang   +10 more
wiley   +1 more source

Kinases Mst1 and Mst2 positively regulate phagocytic bactericidal activity [PDF]

open access: yes, 2015
致病菌引发的恶性化脓和不可控感染一直是临床治疗的一项棘手难题。当细菌侵入后,天然防御细胞如巨噬细胞、嗜中性粒细胞等立即响应,识别并吞噬致病菌的同时调动胞内线粒体和NADPH氧化酶向吞噬泡内释放大量的活性氧(ROS),进而实现杀伤和清除细菌的功能。当这类细胞不能充分发挥杀伤和清除病原体的功能时,即使入侵的细菌数量较少或是致病力不强,也可能诱发机体破损部位或组织器官产生脓肿溃烂、炎症因子风暴和组织坏死,最终导致败血症或致死性脓毒性休克 ...
耿晶
core  

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