矿泉水常识问答     

葛文彬  杨敏 《四川地质学报》2008,28(2):160-163

矿泉水中的饮用天然矿泉水在地下深循环条件下形成,化学成分稳定,水源卫生,细菌学指标安全。有一定含量的矿物盐、微量元素或二氧化碳气体,作为一种天然饮料,是其他饮用水无法比拟的,无须医生指导,长期饮用也不会对人体产生危害。  相似文献   

黄原胶改性微米铁修复地下水中Cr(Ⅵ)污染的试验     

赵勇胜  李彧 《吉林大学学报(地球科学版)》2021,51(4):1224-1230

为了解决微米铁的重力沉降问题,提高微米铁修复地下水Cr（Ⅵ）污染的原位修复效果,本文利用黄原胶对微米铁进行改性,并通过沉降实验探究改性微米铁浆液的稳定性,同时选择Cr（Ⅵ）作为目标污染物,探究黄原胶改性微米铁去除地下水Cr（Ⅵ）污染的降解能力。实验结果显示：当黄原胶的投加质量浓度分别为0.0、1.0、1.5、2.0、2.5、3.0、6.0 g/L时,改性微米铁浆液的悬浮稳定性逐渐得到加强,在5 h沉降实验结束时,对应的相对分光光度值分别为0.05、0.25、0.46、0.57、0.65、0.73和0.87;黄原胶具有抑制微米铁吸附Cr（Ⅵ）的能力,其可促进Cr（Ⅵ）的还原,提高Cr（Ⅵ）的去除率;随着黄原胶投加质量浓度的增加,对应的Cr（Ⅵ）去除率分别为33.4%、41.2%、47.4%、51.1%、53.0%、63.9%和64.1%;6.0 g/L黄原胶改性的微米铁浆液具有最佳的悬浮稳定性,黄原胶的投加提高了微米铁的反应活性,但当黄原胶投加质量浓度超过3.0 g/L时,其对Cr（Ⅵ）的去除率没有显著提高;黄原胶投加质量浓度越大,黄原胶的缓冲作用就越明显。  相似文献   

若干特殊地表风蚀的风洞实验研究   总被引：10，自引：1，他引：10  

邹学勇  刘玉璋 《地理研究》1994,13(2):41-48

经风洞模拟实验,本文对四种特殊地表在净风和挟沙风情况下的风蚀特性,进行了定量的研究。揭示了原始地表结构受人为破坏后,其抗风蚀能力急剧降低的特点。探讨了风成沙粒配、戈壁风蚀平衡与风蚀有关的几个问题。  相似文献   

伊朗卡尔赫水电站坝址松散砾岩钻探工艺          下载免费PDF全文

路殿忠 《探矿工程》1994,(3):30-31

在伊朗卡尔赫水电站坝址工程勘察中，采用金刚石双管单动钻具和ＳＭ胶冲洗液进行取样钻探，用清水钻进压水试验，由于钻探工艺合理，钻探质量均达到了设计要求。  相似文献   

Pure aluminium shear panels as dissipative devices in moment‐resisting steel frames     

G. De Matteis  F. M. Mazzolani  S. Panico 《地震工程与结构动力学》2007,36(7):841-859

The use of energy dissipation systems for the seismic control of steel structures represents a valid alternative to conventional seismic design methods. The seismic devices currently employed are mostly based on the metallic yielding technology due to the large feasibility and efficiency they can provide. Within this context, in the current paper an innovative solution based on the adoption of low‐yield‐strength pure aluminium shear panels (SPs) for seismic protection of steel moment‐resisting frames is proposed and investigated. In order to prove the effectiveness of the system, a wide numerical study based on both static and dynamic non‐linear analyses has been carried out, considering a number of different frame‐to‐shear panel combinations, aiming at assessing the effect of the main influential parameters on the seismic response of the structure. The obtained results show that the contribution provided by aluminium SPs is rather significant, allowing a remarkable improvement of the seismic performance of the structure in terms of stiffness, strength and ductility, with the possibility to strongly limit the damage occurring in the members of moment‐resisting frames. In particular, it is clearly emphasized that the stiffening effect provided by SPs allows a more rational design procedure to be adopted, since the serviceability limit state check does not lead to unavoidable and uneconomical increase of the size of main structural members. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

茶叶寒冻害天气指数保险设计     

汪春辉  陈治杰  陈家金  赵伯听 《气象科技》2020,48(1):141-146

以茶叶萌芽至展叶期寒冻害为突破口,利用1987—2016年福建省泉州市安溪县17个自动气象站2—4月的逐日气象数据及安溪各茶树种植区产量数据,确定茶叶寒冻害的天气指数保险气象指标,分析日极端最低气温与茶叶减产率的关系,建立了茶叶寒冻害指数模型。计算安溪不同区域茶叶种植区不同等级寒冻害的发生概率,应用纯保费率方法厘定了保险费率,并根据福建省政策性农业保险的实际情况,制定茶叶不同区域种植区寒冻害指数保险触发条件、赔付标准,设计了安溪县茶叶寒冻害天气指数保险合同。设计的茶叶寒冻害天气指数保险产品以客观气象数据作为定损依据,可以为茶农提供一种有效的风险转嫁方式,也为保险公司增加新险种提供了技术支撑。  相似文献   

地-井TEM向量交会技术的实现和应用效果     

张杰  吕国印  赵敬洗  陈晓东  赵毅 《物探化探计算技术》2007,(Z1)

这里介绍的地-井TEM向量交会法是一种地-井TEM资料半定量解释方法,通过采用异常分离技术从实测资料中提取出纯异常场,运用地-井TEM的纯异常响应进行向量交会,从而达到快速、有效地确定井旁盲矿体的深度、方位及矿体距钻孔距离。  相似文献   

Geo-engineering properties of expansive soil treated with xanthan gum biopolymer     

Suresh Prasad Singh  Ritesh Das 《Geomechanics and Geoengineering》2020,15(2):107-122

ABSTRACT

This paper presents the effectiveness of xanthan gum (XG) biopolymer in stabilising the expansive soil. The XG biopolymer is mixed with expansive soil in different proportions such as 0%, 0.2%, 0.5%, 0.8% and 1.0% by weight of the dry soil mass. The plasticity, compaction, swelling, compressibility, hydraulic conductivity, strength and durability characteristics of the treated and un-treated expansive soil are examined. Results show that the plasticity index of the treated soil mass initially increases but beyond 0.5% biopolymer addition it decreases sharply. The optimum moisture content and maximum dry density of treated soil, found out from light and heavy compaction tests, do not follow any definite trend. It is also found that increasing XG content increases compressibility slightly but, it reduces swelling pressure, differential free swelling value and hydraulic conductivity remarkably. On the other hand, time-dependent compressive strength and resistance to mass loss increases with increasing XG content. Microscopic examination confirms the formation of gel-like linkage, which brings about the modifications in the treated expansive soil.  相似文献   

利用复测水准资料寻求反映地壳纯形变的定量指标     

崔笃信 《大地测量与地球动力学》1994,(1)

地壳纯变形分为剪切变形和扩张变形。在前人研究的基础上提出了仅利用复测水准资料求出描述地壳剪切变形和扩张变形指标的方法和步骤，所得的定量指标不受基准的影响，受测量累积误差的影响亦很小，能客观地反映地壳变形的特征。通过理论和实例证明：以一点周围变形分量的最大值代表该点周围垂直面的变形程度比其平均值更能突出变形信息。最后根据实例计算结果分析了剪切变形分量、扩张变形分量与形变速率、构造地震的关系。  相似文献   

近红外波段(900—2500 nm)水吸收系数测量   总被引：1，自引：0，他引：1  

邓孺孺  何颖清  秦雁  陈启东  陈蕾 《遥感学报》2012,16(1):192-206

根据水在红外波段强吸收且吸收能力变化大的特点,在所提出可见光波段水吸收系数测量系统基础上增设了薄层水测量装置,使得测量水层厚度可在0.04—350 mm之间变化。在此基础上对厚度为0.04—150 mm的多个厚度水层进行了吸收系数测量,并对消除杂质影响后的测量数据进行了有效整合,得到900—2500 nm波段纯水吸收系数。由于确保了各波段数据均在仪器最佳探测区间取得,所得结果精度较高,且与被普遍接受的前期研究结果相一致,可作为相关定量遥感的基础数据。  相似文献