Results 41 to 50 of about 3,473 (241)

Numerical Analysis of Temperature Field of Static Grain Storage in Semi-underground Double-storey Squat Silos [PDF]

open access: yes
Grain temperature is one of the most important factors that affect the safety of grain storage. In order to reveal the distribution rule of grain storage temperature field in semi-underground double-storey squat silos(SUDSSS), the mathematical analysis ...
JIN Li-bing   +5 more
core   +1 more source

Entanglement of trapped atomic groups in cavity QED(腔中捕获原子团间的纠缠态)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2010
利用单模腔场与捕获原子团的相互作用,提出原子团之间最大纠缠态的制备方案.数值上给出原子团间的纠缠度随白噪声强度的变化关系.计算出系统的热纠缠及其存在的临界温度.
WUWei(吴威), CHENGLi-hong(程丽红)
doaj   +1 more source

Laser Fabrication of Hybrid Graphene/Silver SERS Chips and Their Applications [PDF]

open access: yes, 2017
石墨烯/银复合结构SERS器件可充分发挥石墨烯与银纳米结构的特性,具有良好的性能。银纳米结构SERS活性强,但稳定性差,在空气中易氧化,限制了银SERS器件的应用。石墨烯具有原子级的厚度,良好的光学透过率,稳定的化学性质,是SERS器件理想的壳层材料,可有效阻止银纳米结构与探针分子及周围环境接触,提高基底稳定性。并且石墨烯本身还具有拉曼信号增强、荧光猝灭、探针分子富集等功能,使石墨烯/银复合结构成为SERS信号检测的理想平台。论文针对石墨烯/银复合结构SERS器件制备方面存在的问题展开研究工作 ...
张陈涛
core  

Evolution Pattern of Paddy Temperature Field in Quasi-low Temperature Storage in Flat Stores [PDF]

open access: yes
This study investigated the spatiotemporal evolution of the temperature field of paddy in quasi- low-temperature storage in flat stores using experimental research and numerical simulation.
DUAN Hai-jing   +4 more
core   +1 more source

火灾下两相邻面受火H形钢柱的截面温度分布规律研究

open access: yesJianzhu Gangjiegou Jinzhan, 2019
当火灾中钢框架柱不均匀受火时,会在截面和高度方向产生温度梯度。现行规范给出了火灾中钢构件升温的计算公式,但这些公式均是基于温度沿构件高度和截面均匀分布的假设。采用有限元方法研究了火灾中两相邻面受火钢柱的截面温度场,火灾场景采用ISO834标准升温曲线,钢柱采用非膨胀型防火涂料保护。对于所研究的两相邻面受火钢柱,沿截面宽度和高度方向均存在温度梯度。基于参数分析结果,对欧洲规范EN 1993-1-2中钢构件升温计算公式进行了修正,来计算两相邻面受火钢柱截面各部分的升温曲线。
夏金环, 王培军, 周吉学
doaj  

Numerical simulation of temperature field in surrounding rock of coal mining face based on cyclic advancement algoritm [PDF]

open access: yes
With the increasing depletion of shallow coal resources, deep mining has become the new normal for coal resources development. The high temperature and high humidity thermal environment in deep mines jeopardizes the health of operators, increases the ...
Fei TANG   +6 more
core   +1 more source

边界条件对平板网架结构抗火性能的影响

open access: yesJianzhu Gangjiegou Jinzhan, 2011
在正放四角锥网架结构抗火性能研究的基础上,进一步分析了两向正交正放网架、斜放四角锥网架和正放抽空四角锥网架在大空间建筑火灾中的热力耦合反应。基于有限元程序ANSYS建立了网架结构上弦压杆应力比一致的结构分析模型,按温度增量加载的方法,对不同支座布置、温度场及荷载条件下的网架结构全过程反应进行了分析。结果表明,温度场非均匀性是导致网架结构杆件相互约束的主要因素,随着温度场非均匀性系数η的减小,各型网架结构的临界温度呈下降的趋势;在相同的温度场和支座布置条件下,随着荷载比的减小各型网架结构临界温度呈升高趋势;
蒋舒, 杜咏, 胡夏闽
doaj  

Assessment of wind-induced fatigue crack initiation life at guyed mast earplate joints considering welding residual stresses [PDF]

open access: yes, 2010
A new method for assessing the degree of the cumulative fatigue crack initiation damage of the welds of earplate joints of a guyed mast,which connect the mast with the cable,is proposed.Based on the multi-scale wind-induced stress analysis of the ...
Pi, Y, Qu, W, Wang, W
core  

Numerical simulation and experimental study of the temperature field of AlCoCrFeNi2.1 by selective laser melting [PDF]

open access: yes
AlCoCrFeNi2.1 eutectic high-entropy alloy is widely utilized in the aerospace, nuclear power, military, and automotive industries due to its exceptional properties, such as high strength, excellent ductility, and remarkable wear and oxidation resistance.
Congcong YUE   +5 more
core   +1 more source

不同老化环境下OPLC中光纤机械性能的研究

open access: yesGuangtongxin yanjiu, 2019
在电力系统中,当受到强大的冲击电流时,电力光缆将在高于导体最高工作温度10%的温度场环境下工作,长时间的高温老化工况状态对光纤复合低压电缆(OPLC)光单元中的光纤造成极大的负效应,严重地影响了整个电网的安全运行。针对上述问题,为了研究单模光纤受热前后机械性能变化情况,分析高温老化对光纤的损伤程度,文章通过模拟高于以聚氯乙烯绝缘的OPLC导体温度10%的温度场环境,测试了不同温度和老化时间段下单模光纤的断裂强度、断裂伸长率和光纤涂层剥离力等光纤机械性能,基于测试数据,运用线性拟合的统计方法 ...
伏丽娜   +4 more
doaj  

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