SP-3400气相色谱仪与GC-2400便携式色谱仪对比观测

气相色谱法具有分离效率高、分析速度快、分析灵敏度高等特点,基于SP-3400气相色谱仪及GC-2400便携式色谱仪的工作原理、工作方式、工作条件等,对庐江地震台2套色谱仪观测结果进行对比,分析存在的误差,通过H2高值异常现象,探讨色谱仪运行及维护工作。初步分析结果表明:2套色谱仪定量分析精度均较高,观测数据相关性较好,因不同仪器生产厂家所提供的色谱工作站软件不同,部分测项观测结果存在一定差异。     

SP-2100A型气相色谱仪的安装与调试

通过介绍SP-2100A型气相色谱仪的安装与调试情况,对安装、调试过程中存在的问题做了详细的阐述,斤提出了相应的解决办法。     

SD-3A型自动测氡仪在观测中值得注意的几个问题

论述了数字化气氡仪器SD-3A型自动测氡仪在观测中值得注意的几个问题,特别要注意①气氡观测数据在使用前要经过气温和气压的改正;②闪烁室进水、受到其他气体的污染、补充气体不及时等对观测结果影响是很明显的;③闪烁室在用空气和无水酒精清洗后测值的恢复有一个过程;④仪器标定前应用无水酒精对闪烁室进行清洗,才能提高标定的准确性.     

关于地震预报研究问题的几点思考

通过总结和思考，认为关于深部流体作用和研究内容应重视剖析强震孕育区的深部环境及深浅部构造和介质特征的耦合关系。一是要继续深化对深部介质精细结构的；二是要重视加强深浅部流体运移规律及特征的研究，对岩石圈内流体通道特征的研究是主要途径之一。从物理基础角度提出了地震前兆成因的3种类型：力学成因前兆，介质状态成因前兆和物质运移成因前兆，并讨论了不同成因类型前兆的地震预报意义。文章还简述了地震地下流体化学组分探测技术存在的问题，以及光纤传感器在今后预测技术革新中的优势和发展趋势。     

利用尾波震级探讨地震前兆方法应注意的几个问题

本文根据尾波理论及观测结果给出了一种提取地震前兆信息的新途径，其方法简单、实用，值得尝试。该方法是通过两种震级差来实现，可用于地震预报。     

CJ6型磁力仪测定磁偏角的几个问题

本文讨论了使用CJ_6型磁力仪测定磁偏角中的几个问题。认为仪器材料磁性影响、仪器置平程度好坏、望远镜聚焦位置改变,正、倒镜读数差大小、悬丝扭力大小以及磁系翻转复位率都可以对观测结果产生影响。作者提出了在观测中提高磁系翻转复位率的几项措施,并对CJ_6型磁力仪的观测和仪器改进提出了有关建议。     

水汞观测中值得注意的几个问题

通过实际工作和实验研究认为：（１）水汞观测室温１５－３０℃，湿度在８０％以上是最佳工作条件。当气温在３１℃以上，湿度连续超过８０％，则仪器零点漂移大，捕汞管净化困难，标定Ｋ值减小。即使在干燥季节，测室温度在１２℃以下，可使标定Ｋ值变大；（２）实验表明硫酸含汞，有的高，有的低， 启用应作选择。氯化亚锡对汞量测定影响不大，选择杂质少，溶液清亮，释汞能力强的；（３）蒸馏水经常更换也有一定干扰；（４）外拉     

震情会商的意义与主持地震会商应注意的几个问题

本文阐述了震情会商的意义,强调凡责任重大的经验性预报都得会商.并根据经验,分析了会商主持人应具备的素质与主持会商应注意的几个问题.     

数字地磁观测系统日常维护与数据处理应注意的几个问题

随着中国地震局95—01-02项目的实施,地磁专用数字记录仪GM3磁通门磁力仪和数字化公共设备DQS-1,在邕宁地震台运行已有近2年的时间。新的数字观测仪器的应用,改变了地磁台站原有的工作模式,取得了高灵敏、高分辨力、高采样率、高信息含量的观     

FD-125测氡仪观测中值得注意的几个问题

论述了FD-125测氡仪在水氡观测中值得注意的几个问题：①仪器的供电系统中不应有线路接触不良；②仪器接地线应避免接触不良；③其他用电器内部线路也不应有接触不良；④引起电场和磁场变化的大功率用电设备不应在测量时间内使用；⑤供电电路中电压尽可能避免大幅度波动等。上述因素对氡测值都有影响，影响幅度可达10％以上。     

Some questions of geomechanics of the faults in the continental crust

We present the results of laboratory experiments on studying the formation of different slip modes on the interfaces in a rock massif such as aseismic creep, stick-slip, and periodic slow-slip events. It is shown that the way of releasing the accumulated elastic energy is determined by the mesoscale structure of the gouge rather than by its macroscopic strength characteristics. The evolution of the stress chains which are formed and broken during the displacement on the fracture, as well as the length and number of these chains, completely determines the regularities of the deformation. The role of these load-bearing elements in nature can be played, e.g., by the “contact spots,” which determine the regularities of stress concentration near the interblock boundary. We consider the effects of low-amplitude vibrations on stressed fractures. It is shown that, depending on the mode of deformation, the vibration impact can either reduce or boost the amplitude of separate events and the fraction of energy that is released dynamically. In the conclusion of the paper, we discuss the possibility of using the shear strength of the fault zone as a geomechanical parameter controlling the mode of deformation.     

Interference of oil spill emulsifiers with gas chromatography

Several commercially available spill control agents interfere with gas chromatographic correlation of spilled oils with suspected sources. The effects of four such products are presented. Two of these interfere seriously. One is removable by a simple clean-up procedure, and the other is not removable in principle. In favourable cases, its interference may be minimized by extrapolation. Anticipated interference with other analytical methods is surveyed.     

强震观测仪器接地与防雷的思考

就四川省地震局实施的“十五”强震建设项目中的强震仪器Etna的接地和防雷措施进行了探讨.强震仪Etna的接地要独立于其它设备或建筑物接地,而且相互间的距离要大于15米,接地电阻要小于4 欧姆.当相互间的距离小于15米时要增加防雷器,以防止反击雷对于仪器的破坏.在场地无法达到所要求的距离时,则要采用联合接地的办法,以防反击雷造成设备损坏.而且在接地极时不能简单地采用铜板接地,必须严格按照有关标准采用接地网才能真正达到防雷要求。     

顶空气相色谱法测定水中挥发性有机污染物

介绍静态顶空气相色谱分析的原理,研究温度、相比、分配常数和无机盐等参数对顶空分析灵敏度的影响.此方法对8个挥发性苯系物的线性相关系数0.999,相对标准偏差0.95%,方法检出限1μg/L.在炼油厂废水中,检出104个色谱峰,其中苯、甲苯、乙苯、间,对二甲苯和邻二甲苯均有检出,浓度范围在268-1622μg/L.污水处理厂出口水样和废水库样品中挥发性有机物均未检出.采集15个安徽巢湖水样,挥发性苯系物和挥发性有机物均未检出(1μg/L).     

Hollow fiber liquid-phase microextraction as clean-up step for the determination of organophosphorus pesticides residues in fish tissue by gas chromatography coupled with mass spectrometry

Hollow fiber liquid-phase microextraction (HF-LPME) technique was used as a clean-up procedure for the determination of organophosphorus pesticides (OPPs) in fish tissue. In this study, eight OPPs were first extracted with acetone from fish sample, the organic extract after rotatory evaporation was then redissolved with water-methanol (95:5, v/v) solution, followed by polyvinylidene difluoride (PVDF) HF-LPME. Experimental HF-LPME and other sample preparation conditions were carefully investigated and optimized. Under the optimum conditions, good linearity were observed in the range of 20-500 ng/g, limits of detections (LODs) were in the range of 2.1-4.5 ng/g. The repeatability and recovery of the method also showed satisfactory results. Compared with traditional sample preparation method for the determination of OPPs in fish tissue, the method developed in this study eliminated the solid phase extraction (SPE) step, simplified the sample preparation procedure and lowered the cost of analysis.     

气相色谱仪检测溶解气H2和He最佳观测条件的选择

引言 H2和He是反映地壳应力、应变变化较灵敏的组分之一，已基本得到地震地下流体学科的共识。     

Some questions arising from the application of hydraulic theory to the Faroe Bank Channel deep-water flow

The results from a recent oceanographic field experiment in the Faroe Bank Channel are discussed from the standpoint of determining how well the classical hydraulic assumptions of stationarity and a quiescent upper layers were fulfilled. Evidence from these as well as previous measurements indicated that both prerequisites for the application of simplified hydraulic theory are not always fulfilled in the Channel. The implications of these results for the theoretical treatment of the hydraulic problem are discussed.     

积分安培检测-离子色谱法同时测定地下水中的溴离子和碘离子

采用积分安培-离子色谱法同时测定地下水中的溴离子和碘离子,该方法的相关性好（ r＞0．999）,精密度高（RSD％＜4．0）,样品加标回收率为90～110％,溴离子检出限为5．6μg/L ,碘离子检出限为2．1μg/L。本法简便、快速、准确且选择性好,可用于分析地下水中的溴离子和碘离子。