共查询到19条相似文献,搜索用时 140 毫秒
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大地电磁测深是电磁勘探的一个重要的方法,本文主要分析了大地电磁测深中关键的两个参数:TE,TM极化视电阻率曲线,从电磁测深视电阻率曲线的影响因素分析着手,给定TE,TM极化视电阻率曲线的识别方法,最后给出识别的思路。 相似文献
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影响电煅无烟煤电阻率的几个因素 总被引:1,自引:1,他引:0
对电煅无烟煤电阻率与一次送电电流和温度之间的关系进行了试验研究,得到了它们之间的关系表面式模型,据此,可以在环境温度,炉壳温度变化不大的情况下,预测电煅无烟煤的电阻率,另外还分析了电阻率与真密度,原煤粒度分布,加排料量,煅烧区长度,电流密度之间的相关性,结果表明,电煅无烟煤电阻率及其分布与电流密度,煅烧区长度,原煤粒度分布,加排料量密切相关。 相似文献
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通过对大地电磁测深法在西部勘探中优势的分析,结合其地球物理原理,指出建立区域电性模型对MT资料预处理、反演、解释等工作的重要性。结合阿什里地区概况,提出MT首支电阻率统计法、测井电阻率和区域综合资料电性统计等方法来建立区域电性模型。 相似文献
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李毅 《中国石油和化工标准与质量》2014,(7):119
电偶源瞬变测深作为瞬变电磁法正演理论的重要组成部分,研究其形成的瞬变电磁场特征对于我们更好得理解瞬变测深的原理有很大的帮助,本文采用线性数字滤波算法实现了快速、准确的电偶源测深的瞬变电磁场计算,并用已知解析解的均匀大地地表时间域磁场垂直分量对该法进行验证。 相似文献
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本文研究了一些电真空玻璃的电阻率,作者确定了某些玻璃在一定温度范围内的电阻温度系数,同时提出了计算某些电真空玻璃电阻率和K-100的经验式。 相似文献
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随着我国氧化铝产能的不断增大,在生产时排放出的污染性废渣赤泥给环境带来多方面的影响,所以合理地利用并消纳赤泥就显得尤为重要.本文利用赤泥配制5种固化剂对黄土进行改良,将赤泥改良后的黄土用于路基材料.试验测试了改良黄土在直剪过程中电阻率的变化,分析了龄期对赤泥路基材料的电阻率和抗剪强度的影响.通过击实试验确定试样的最优含水量,在最优含水量下制样并养护3 d、7 d、14 d、28 d.结果表明:不同龄期下电阻率随剪切位移的增大呈现上升趋势;电阻率和抗剪强度分别与龄期的对数相关性较好,二者都随养护龄期的增大而增大;随着赤泥掺入量的增大,导电离子增多,电阻率减小;相同赤泥含量下,垂直压力越大,抗剪强度越大;得到抗剪强度与电阻率的线性关系式. 相似文献
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研究了粉煤灰掺量分别为0、20%和40%,水胶比为0.4的水泥浆体的抗压强度、电阻率、化学收缩以及水化产物的变化规律.电阻率采用无电极电阻率法进行测试,化学收缩采用ASTM C1608-12规定的膨胀测定法进行测试.结果表明,在250 d龄期时,粉煤灰掺量为20%的硬化水泥浆体抗压强度仅比空白组低5%;当粉煤灰掺量增大时,水泥浆体在3 d龄期时的强度、电阻率和化学收缩均减小,抗压强度与电阻率之间具有很好的线性关系.XRD及热重分析表明,随着粉煤灰掺量增加,水化硅酸钙含量减少,在3 d龄期时水化产物中出现了钙矾石. 相似文献
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Kun Dai Xu Ji Zhi-Dong Xiang Wei-Qin Zhang Jian-Hua Tang 《Polymer-Plastics Technology and Engineering》2013,52(3):304-306
The variations of electrical property of an ultralight conductive carbon nanotube/polymer composite foam upon compression were investigated. It was found the sharp increase of volume resistivity and strain was generated by the same microstructural change, i.e., the damage of foam struts. Even the strain was increased to as high as 50%, the ultimate resistivity remained stable. Volume resistivity of the foam kept almost changeless under an invariant external mechanical field. The stable microstructure of the conductive network formed by contact of CNTs and the high endurance of samples' core regions endow the ultralight conductive foam with much stable electrical properties. 相似文献
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Jung-Hoon Song Kyeong-Ho Yeon Jaeweon Cho Seung-Hyeon Moon 《Korean Journal of Chemical Engineering》2005,22(1):108-114
An RO-CEDI (Reverse osmosis-continuous electrodeionization) hybrid process was investigated to produce high purity water.
The RO system, with an effective membrane area of 1.1 m2, was operated using tap water with conductivity of 64 μs·cm−1, and the CEDI system experiments were carried out in a cell-pair stack consisting of 3 compartments. During the parametric
study of the RO-CEDI hybrid system, the optimal operating conditions were determined based on the water purity. The electrical
resistivity and water dissociation of the ion exchange resins and ion exchange membrane were verified as the key mechanisms
of the CEDI system in the water purification. The produced water met the quality requirements as a make-up water in a nuclear
power plant with a resistivity of 10–16.7 MΩ·cm. 相似文献
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Factors affecting the electrical resistivity of soybean oil methyl ester (which is important in some industrial applications)
were investigated by the addition of polar constituents [free fatty acids (FFA), water, phospholipids, monoglyceride, sterol,
tocopherol, peroxides, and β-carotene] to aluminapurified soybean oil methyl ester (APSBOMe). Investigation of measuring conditions
showed that reproducible results were obtained when the potential was greater than 25 V, and the charging time was greater
than 10 s. The resistivity of APSBOMe increased logarithmically as temperature decreased linearly. FFA had little effect on
resistivity. Saturation with water lowered the resistivity of APSBOMe much more than that of alumina-purified soybean oil
(APSBO). Phospholipids reduced the resistivity significantly when added to dry ester, but the addition of water affected the
resistivity of the samples containing phospholipids only slightly. Monoglyceride, sterol, tocopherol, and hydroperoxide affected
the resistivity of dry methyl ester similarly, but only monoglyceride showed a significant synergistic effect with water.
Diacylperoxide and β-carotene had little effect on the resistivity of the ester. 相似文献
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Dong Viet Phuong Tran Pitichon Klomjit Somnuk Tangtermsirikul 《Journal of Adhesion Science and Technology》2020,34(19):2107-2119
AbstractThis paper presents two models: one for predicting the electrical resistivity of concrete and the other for the corrosion potential of reinforcing steel. The prediction models were developed based on experimental results, considering various influencing factors. The experiment approach included the concrete mix proportion, chloride content, concrete cover thickness and time of exposure as the parameters. The results revealed that fly ash concrete showed significantly high electrical resistivity even in the presence of chloride ions. The effects of fly ash became more significant when the water to binder ratio was lower. Chloride ions also decreased the corrosion potential of steel in both the OPC and fly ash concrete. The corrosion potential was found less negative for fly ash concrete due to higher electrical resistivity. The prediction results show good agreement with the experimental results of this study and some other researchers. 相似文献
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In this study, the variation of the resistivity of Al85Y9Ni6 metallic glass produced by melt-spinning method was investigated and formulated. DSC results demonstrate three crystallization peaks and resistivity measurements support this result. The electrical resistivity measurements were carried out in the temperature range 300–877 K by the four-point method. The greatest reduction in resistivity was observed at temperatures between 527–632 K. 相似文献
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This paper provides a comprehensive overview of existing experimental and modelling approaches to determine effective diffusion coefficients of water saturated ordinary Portland cement-based materials. A dataset for diffusivity obtained from different experimental techniques have been presented for cement paste, mortar and concrete. For cement paste at low porosities, diffusivity reported by different authors varies up to a factor of five and electrical resistivity measurements for low capillary porosity are up to one order of magnitude higher compared to other techniques. Experimental data of mortar and concrete reveals predominant influence of increasing tortuosity due to aggregates and limited influence of interface transition zone. Hence, a particular emphasis has been placed on assessing predictability of diffusivity models for cement paste on a larger dataset collected in this paper. It has been observed that all predictive models have similar level of accuracy and fail to predict electrical resistivity data at low capillary porosity as these models are not calibrated using electrical resistivity data. 相似文献