蒙城台地磁“低点位移”异常特征及与华东及其临近地区地震关系初探

本文分析了Z分量"低点位移"异常变化在地震前出现的异常特征、产生的背景,影响因素.得出了低点位移幅度大,频次高,异常可信度就高;异常幅度、震中远近及震级大小与异常间隔没有明显相关性;震中位置、震源深度与异常有着独特的关系的结论.     

Simultaneous oxidation of NO, SO2 and Hg0 from flue gas by pulsed corona discharge

A process capable of oxidizing NO, SO2 and Hg0 was proposed simultaneously, which utilized a high-voltage and short-duration positive pulsed corona discharge. By focusing on NO, SO2, and Hg0 oxidation efficiencies, the influences of pulse peak voltage, pulse frequency, initial concentration, electrode number, residence time and water vapor addition were investigated. The results indicate that NO, SO2 and Hg0 oxidation efficiencies depend primarily on the radicals (OH, HO2, O) and the active species (O3, H2O2), etc. produced by the pulsed corona discharge. The NO, SO2 and Hg0 oxidation efficiencies improved as increasing pulse peak voltage, pulse frequency, electrode number and residence time, while they are reduced with an increasing initial concentration. By adding water vapor, SO2 oxidation efficiency is improved remarkably, while NO oxidation efficiency is decreased slightly. In our experiments, the simultaneous NO, SO2, and Hg0 oxidation efficiencies reached to 40%, 98% and 55% with the initial concentrations 479 mg/m3, 1040 mg/m3, and 15.0 ug/m3, respectively.     

围岩位移自动监测记录系统

以往围岩位移监测的位移数据是先埋设好位移监测的设备后由工作人员定时采集。这种方式不能准确记录岩体发生变形的时间,数据量也较少,不利于对危险情况及时发现处理以及数据的后期研究分析。自动化监测系统采用短时间间隔的数据采集可以很好的克服以上的缺点。系统采用USB存储方式,将监测数据以文本文件的格式直接存储到U盘上,可以更方便的应用计算机处理数据。     

隧道掘进爆破载荷作用下埋地管道的振动峰值速度预测研究*

为研究隧道掘进爆破过程中地震效应对邻近埋地管道安全性的影响,建立平行于隧道的埋地管道数值模型,将管道视为薄壳圆柱体,定义管道在动载荷作用下的塑性破坏准则,并利用无量纲分析法构建管道表面质点的振动速度关于振动频率与爆破持续时间的数学模型,从而研究埋地管道受震特性。结果表明:隧道掘进爆破作业下成洞侧的管道应力峰值低于非成洞侧的管道应力峰值,爆炸载荷下邻近埋地管道表面最大振动速度位于爆源与管道表面最近点处,在该点两侧45度范围内为管道易受损位置。将预测公式计算所得振速峰值与数值模型提取的振速峰值进行比较,得出二者的平均误差约为17.7 %。     

In vitro fluorescence displacement investigation of thyroxine transport disruption by bisphenol A

Bisphenol A (BPA) is a chemical with high production volume and wide applications in many industries. Although BPA is known as an endocrine disruptor, its toxic mechanisms have not been fully characterized. Due to its structural similarity to thyroid hormones thyroxine (T4) and triiodothyronine (T3), one possible mechanism of BPA toxicity is disruption of hormone transport by competitive binding with the transport proteins. In this study, the binding interactions of BPA, T4, and T3 with three thyroid hormone transport proteins, human serum albumin (HSA), transthyretin (TTR), and thyroxine-binding globulin (TBG) were investigated by fluorescence measurement. Using two site-specific fluorescence probes dansylamide and dansyl-L-proline, the binding constants of BPA with HSA at drug site I and site II were determined as 2.90 104 and 3.14 104 L/mol, respectively. By monitoring the intrinsic fluorescence of tryptophan, a binding constant of 4.70 103 L/mol was obtained. Similarly, by employing 8-anilino-1-naphthalenesulfonic acid as fluorescence probe, the binding a nity of BPA with TTR and TBG was measured to be 3.10 105 and 5.90 105 L/mol, respectively. In general, BPA showed lower binding a nity with the proteins than T3 did, and even lower a nity than T4. Using these binding constants, the amount of BPA which would bind to the transport proteins in human plasma was estimated. These results suggest that the concentrations of BPA commonly found in human plasma are probably not high enough to interfere with T4 transport.     

建筑的低碳及标准

低碳发展势不可挡 低碳发展已经成为中国社会经济发展的重要内容.“十二五”规划首次明确提出了CO2减排目标,之后各个行业、各种政策和行动迅速展开.尽管中国处于经济快速发展阶段,通过多种政策措施,中国有可能实现低碳发展,实现2030年达到CO2,排放的峰值,同时峰值时的排放量也要控制不能过高.如果要实现在哥本哈根气候变化大会上选成的到2100年将全球平均升温和1850年相比控制在2摄氏度的目标,则我国需要在2025年之前实现CO2排放峰值,并且峰值排放量不超过90亿吨CO2.     

水泵系统噪声与振动控制

从水泵系统振动噪声传播途径控制的角度,着重分析了水泵机座二次隔振系统、水泵接管隔振、隔振系统位移限制、管道支架减振、管道穿墙隔振、管道阻尼隔声包扎等水泵系统振动固体传递途径的控制,消除与建筑结构之间的刚性连接。分析了振动噪声空气传播的阻隔与吸收。     

燃烧对SF6扩散影响的示踪试验研究

根据2010年9月,在北京某试验场开展的一系列SF6示踪扩散试验,以及获取的SF6浓度空间分布数据,以高斯模式和计算机拟合为基础,计算出SF6浓度分布在水平和垂直方向的扩散标准差、地面峰值浓度等参数,分析、总结出了在典型地理(山区和平原连接处)和边界层条件下燃烧对SF6扩散的影响。通过试验及分析可知,燃油对试验区域气流产生了明显扰动,但具体原理有待于进一步分析。     

大位移摩擦摆底层和多层隔震韧性结构∗

结构韧性性能的目标是:在极罕遇地震作用时,结构不发生严重破坏;地震结束后,结构能恢复预期状态,进而恢复建筑功能的性能。隔震是结构韧性性能实现的关键技术,然而,结构隔震层位移响应超过允许值,引发隔震支座破坏,导致其减震性能失效,成为制约该类结构韧性性能目标实现的关键难题。本文以结构层作为滑动面,主体结构整体或滑动面之间的部分结构作为滑动块,提出大位移摩擦摆新型结构,通过隔震层的不同位置以及数量,构建大位移摩擦摆底层和多层隔震结构体系。分别建立该统一分析模型、探明其减震机理证明其良好减震性能,实现韧性结构性能目标。开展结构设计实现和韧性性能评价研究,表明了主体结构、非结构构件和大位移摩擦摆(支座和结构层)等地震损伤和恢复能力。本研究为韧性结构发展提供了结构新体系和关键发展方向。     

综掘巷道超前支护装备双组支撑支护特性实验研究

为提高综掘巷道的掘进效率、改善支护工艺,设计一种用于综掘巷道迎头顶板支护的迈步式超前支护装备。通过对装备工作原理的分析,建立其三维模型。为检验装备的支护效果,设计了支护特性实验方案,构建实验平台,基于实验平台进行了双组支撑状态下的支护实验。实验结果表明:顶板上离固支边越远处动态位移变形量越大,接触力波动也越大; 在双组支撑状态下,顶板变形量最大达到9 mm,接触力最大幅值达到5.84 kN,位置均为顶板纵向中线位置处,在被支护后,该位置最迟趋于稳定; 在双组支撑状态下,顶板变形及接触力经历2~3 s波动后都将趋于平稳; 超前支护装备对顶板的稳定性能起到良好的控制作用,能提高顶板的安全性,为后续产品研发及工业实验提供依据。