Results 41 to 50 of about 25,884 (166)
Acoustic Emission Warning Signals Change Law Research during Deformation and Failure of Gassy Coal Rock [PDF]
, 2013 为提高矿井瓦斯突出灾害预测准确率,基于力学、声学理论,采用实验室试验方法,以标准煤试样为研究对象,对含瓦斯煤岩变形破裂过程声发射(AE)预警声信号变化规律进行研究。试验结果表明:围岩应力增大,煤岩破裂由低围岩应力的脆性破坏逐渐过渡到高围岩应力状态的塑性破坏,可根据声发射高幅信号提前预测煤岩破裂时刻。瓦斯的力学和非力学作用对煤岩体力学性质和变形特性的影响均随瓦斯压力的增加而变大。瓦斯压力越大,则煤岩破裂进程加快,积累的声发射能量迅速释放,高值振铃计数声发射信号覆盖时间区段变长 ...
吕祥锋 +5 more
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Review of Policy Research, EarlyView.ABSTRACT Public appointments shape the top‐level bureaucracy by serving as a gateway for professionals with different profiles, chosen based on different criteria. In general, the literature has been more interested in analyzing appointments based on merit or sponsorship, based on verification of loyalty to the government or technical competence ...
André Vaz Lopes +1 more
wiley +1 more source
Experimental research on seepage characteristics and seepage damage-failure mechanism of sandstone under strong seepage field [PDF]
, 2017 强降雨形成的渗流场作用会加快软弱岩体的损伤破坏，是引发山体滑坡、泥石流、崩塌等地质灾害和其它突发工程安全事故的重要诱发因素。因此，加强渗流场作用下软弱岩体的渗流特性及损伤破坏机理的试验研究具有重要的理论意义和实际意义。论文以软弱砂岩为研究对象，利用重庆大学煤炭灾害与控制国家重点试验室的RLW-2000M煤岩三轴流变试验机，研究了砂岩在强渗流场作用下的渗流特性和渗流损伤破坏机理。具体的研究内容如下： (1)通过采集、钻芯、切割、打磨、浸泡等过程制备饱和的砂岩试样，根据试样的全应力 ...
梁健业
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Veterinary Dermatology, EarlyView.Canine atopic dermatitis (cAD) is a chronic condition requiring life‐long management. Accurate diagnosis can be challenging, with no reliable diagnostic test. This study aimed to generate a simple diagnostic model for cAD. This model is a relevant prototype for an app‐based tool to support general practitioners in the diagnosis of cAD alongside ...
Xavier Langon +2 more
wiley +1 more source
Gaoya dianqi, 2012 笔者研究了145 kV断路器开合电容器组电流试验的标准选用、试验方法、试验回路参数、试验要求等,并介绍了试验情况。研究成果的应用使得145 kV投切电容器组断路器的开合电容器组性能得到了型式试验考核,为工程的安全可靠运行提供了保障。
黄实 +4 more
doaj
Veterinary Dermatology, EarlyView.ABSTRACT Background Identification of offending foods in dogs with adverse food reactions is usually based on “deterioration” during open food challenges. Objectives To examine the placebo effect during double‐blinded, placebo‐controlled food challenges using a predefined set of criteria for relapse.
Evi I. Sofou +4 more
wiley +1 more source
Gaoya dianqi, 2014 智能GIS作为智能变电站的关键开关设备目前正在迅速发展,但其型式试验项目尚无国家标准对此进行明确规定。为了验证智能GIS设备的可靠性,笔者对智能GIS相关试验项目之一隔离开关开合母线充电电流试验的试验方法进行了探讨,并针对隔离开关开合母线充电电流试验方式1和方式3开展了相关试验研究。通过对试验数据的研究分析,提出了智能GIS开合母线充电电流的试验方法建议。文中的研究结果对今后更高电压等级智能GIS型式试验的开展具有较大的参考意义。
陆建挺 +4 more
doaj
The mechanism of BaP and DDT co-exposure induced DNA damage via MAPK signal pathway [PDF]
, 2016 【目的】 苯并(a)芘(benzo[a]pyrene，BaP)是多环芳烃类化合物的典型代表之一，于各种环境介质中广泛存在，具有很强的致癌性，被国际癌症研究机构列为1类致癌物。滴滴涕(2，2-bis(4-chlorophenyl)-1，1，1-trichloroethane，DDT)曾是生产及使用范围最广的一类有机氯农药，在环境中非常难于降解，具有高亲脂性，可以对哺乳动物的肝脏、肾脏、神经等系统造成损害。BaP和DDT常共存于环境并可通过食物链的生物放大作用富集于人体，危害人类健康。因此 ...
刘敏
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Experimental Study on Performances of Heat Pump Water Heater Based on Heat Recovery of Domestic Wastewater [PDF]
, 2011 In order to solve the present situation of unceasing demand for hot water and severe loss of quantity of heat from wastewater,a new type of heat pump water heater was developed based on heat recovery of domestic wastewater.In this paper,the relation ...
core +1 more source
Contribution of microcosm experiments to conservation science
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract Microcosms, or miniature experimental systems, have been used to develop models and theories in ecology. However, their contribution to conservation science is unclear. We explored the application, design, and impact of microcosms in conservation science from 469 systematically identified articles published from 1986 to 2023.
Eleanor R. Stern +3 more
wiley +1 more source