Coupling of Multi-mode Optic Fiber to Oxynitride Waveguide for the Application of Chip Spectrometer [PDF]
, 2015 在环境监测，食品安全，化学、医药产业和日常生活中，如何便捷地检测出目标物的化学成分成为了一个迫切的需求。传统的化学检测方法往往需要专业的检测人员在实验室进行，并且一种化学分子对应一种专门的检测方法，同时对多种混合物质鉴别的方法并不多见。拉曼光谱是一种指纹式的鉴别方法，一种特定的分子往往具有数个拉曼特征峰，这些特征峰的拉曼偏移是固定的。因此拉曼光谱可以通过特征峰同时鉴别出多种化学分子，检测时间仅需要几秒钟，而且操作简单，只需要将探头对准被测物即可，这为化学检测走出实验室提供了极大的便利 ...
崔晓斌
core
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
core
, 2016 跨海大桥是最需要考虑节约资源和进行环境保护的桥梁。而大跨度公铁两用斜拉桥是目前占用跨海通道资源最少的大桥,也是跨海大桥设计的首选桥型。在广泛调研跨海大桥和收集文献资料的基础上,对我国近年来修建的跨海大桥进行了梳理统计,发现我国已经建设的公路跨海大桥大部分的主航道桥是斜拉桥。对部分国内外大跨度公铁两用斜拉桥的结构设计关键技术进行了论述;结合大跨度公铁两用斜拉桥的结构特点,对适用于大跨度公铁两用斜拉桥的结构体系和桥面布置进行了对比分析;提出了影响公铁两用斜拉桥跨度增大的问题与对策 ...
雷俊卿 +1 more
core
Sensitive neighborhood range of red sandstone under rheological disturbance condition [PDF]
Under the action of disturbance load, the rheological rock mass in the “sensitive neighborhood” is prone to deformation and failure. In order to study the influence of confining pressure on the range of disturbance “sensitive neighborhood”, the red ...
Bo WANG +7 more
core +1 more source
Jianzhu Gangjiegou Jinzhan, 2017 均布与局部轴压共同作用下钢筒仓屈曲性能与仅均布轴压作用筒仓的屈曲性能有显著区别。采用有限元非线性屈曲分析方法,考虑环向焊缝几何缺陷,对均布与局部轴压作用下钢筒仓的屈曲性能进行了研究。分析参数包括均布轴压比、局部轴压分布角、仓体径厚比、缺陷幅值等。研究表明,局部轴压屈曲承载力随均布轴压比、缺陷幅值、局部轴压力分布角和径厚比的增加而降低。在有限元参数分析的基础上,提出了考虑均布轴压力影响的局部轴压临界屈曲应力计算公式,该计算公式与有限元分析结果基本吻合。
王跃, 郑玉超, 王培军, 朱绪林
doaj
Experimental study on uniaxial compressive strength characteristics of conventional model ice in tank [PDF]
ObjectiveIn the ice-propeller milling or collision test, in order to accurately test the ice load of the propeller, it is very important to use model ice which satisfies similarity with the geometric and mechanical properties of real ice.MethodsUniaxial ...
Chao WANG, Longhui LI, Pei XU
core +1 more source
内压与局部轴压共同作用下钢筒仓屈曲性能研究(Ⅱ):屈曲应力计算方法
Jianzhu Gangjiegou Jinzhan, 2017 采用有限元方法研究了考虑内压影响的局部轴压作用下钢筒仓屈曲应力。考察了内压、局部轴压分布角及径厚比等因素对钢筒仓屈曲应力的影响。将内压与局部轴压作用下钢筒仓屈曲应力的分析结果与现有规范中关于内压与均匀轴压作用下钢筒仓屈曲应力的计算结果相比较,发现现有规范公式不能准确计算内压与局部轴压作用下钢筒仓的屈曲应力。在参数分析的基础上,提出了相应的考虑内压影响的局部轴压作用下钢筒仓屈曲承载力计算公式。经验证,该公式与有限元分析结果吻合较好。
王培军, 朱绪林, 杜瑞红
doaj
Effect of the density and inclination of joints on the strength and deformation properties of rock-like specimens under uniaxial compression [PDF]
, 2017 The effects of the combination of joint density and inclination on the strength and deformation characteristics of rocklike specimens containing open joints were studied by using uniaxial compression tests.
CAO Ping +5 more
core +1 more source
Mechanical properties and fracture damage law of coal-rock composition under the action of supercritical CO2 [PDF]
, 2023 The injection of CO2 into deep unrecoverable coal seams is one of the effective ways to achieve CO2 geological sequestration, but CO2 will be in a supercritical state under the action of high pressure and high temperature.
Jianbing YAN +6 more
core +1 more source
Experimental analysis on residual ultimate bearing capacity of thin plate with internal explosion dent damage under biaxial compression [PDF]
ObjectivesIn modern naval warfare, advancements in weaponry have significantly increased the vulnerability of ships to explosion impacts. Precision-guided weapons, in particular, pose a significant threat, as internal explosions within ship cabins can ...
Lei AO +5 more
core +1 more source