锂型蒙脱石的离子导电性          下载免费PDF全文

黄振辉  陈立泉 《地质科学》1992,(1):71-77

本文报道了一种以天然矿物钠基蒙脱石(Montmorillonite.简写 MTR)制备的锂型蒙脱石(MTR:Li⁺)的离子导电性能。在室温下(25℃),MTR:(Pc)的离子电导率为1.53×10^-3Ω^-1·cm^-1,MTR:Li⁺(DMF)离子电导率为1.31～1.85×10^-3Ω^-1·cm^-1,电子电导率在总电导率的1%以下,激活能0.14eV,分解电压2.6—3.3V,电化学性能稳定。  相似文献   

甘肃西成矿田铅锌矿床的成矿物质来源探讨   总被引：1，自引：0，他引：1       下载免费PDF全文

林兵  程海生 《地质科学》1992,(2):149-159

本文系统地研究了甘肃省西成矿田铅锌矿床的地层地球化学和铅同位素地球化学特征,得出了该区成矿金属物质主要取自基底地层而不是含矿层的新认识。  相似文献   

新构造运动在塔里木盆地演化中作用   总被引：6，自引：1，他引：6  

王跃  董光荣 《地质论评》1992,38(5):426-430

在第四纪以来的新构造运动的影响下,塔里木盆地逐渐向封闭的干旱盆地演化。由于波动式的新构造运动在每阶段表现的形式有差异,因而盆地的演化也相应表现出明显的阶段性。该盆地新构造运动大致经历了上新世末—早更新世、早更新世末—中更新世以及晚更新世三个阶段,其中以早更新世末的一次构造运动对盆地的地貌影响最大。新构造运动是由印度板块和欧亚板块挤压引起的,故塔里木盆地与青藏高原的演化阶段在时间上大致吻合。  相似文献   

Inducing action of hydrogen migrating along faults on earthquakes     

Qichu Su  E. Zeller  E. Angino 《地震学报(英文版)》1992,5(4):841-847

The reduction of the microhardness and the crystal constants of some non-metallic materials, such as calcite, dolomite, antigorite, etc., are observed after a short time of hydrogen permeating treatment at low pressure. It means that hydrogen diffusion can cause their strength dropping or weakening. The hydrogen, which is produced under the earth by various chemical reactions or accumulated when the earth formed, is migrating up continuously along faults, causing weakening of rocks and faults at the same time. So it is possible that rocks and faults break under lower tectonic stress condition. Hydrogen anomalies are passive reflection, precursor and accompaniment of fault activities or earthquakes on the face of it, but hydrogen migrating has active influence on faults and its moving. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,14, 229–235, 1992.  相似文献   

The spatial distribution characteristics of shallow fissures of a landslide in the Wenchuan earthquake area   总被引：1，自引：1，他引：0  

Xing-qian Xu  Li-jun Su  Chao Liu 《山地科学学报》2016,13(9):1544-1557

Shallow fissures, being the main infiltration paths of fluid on the surface of a slope, played an important role in the whole process of a landslide. However, the spatial distribution characteristics of fissures in the slope are difficult to be determined. In this study, we attempted to characterize the variation pattern of slope fissures along depth in the Wenchuan earthquake area in Sichuan Province by combining engineering geological investigation, geomorphologic analysis and geophysical investigation. The geophysical methods that were used in this study include Multichannel Analysis of Surface Wave (MASW), Ground Penetrating Radar (GPR) and Electrical Resistivity Tomography (ERT). The results suggested that geophysical parameters (shear wave velocity, electromagnetic signals attenuation and resistivity) could provide valuable information for the spatial network of shallow fissures. Through the verification by engineering geological survey and geophysical sensitivity analysis, this work highlighted that MASW was the most appropriate technique to delineate the propagation of shallow fissures in a gravel soil slope.  相似文献   

Identifying suitable habitats of three ungulates in Arjinshan National Nature Reserve,China   总被引：1，自引：0，他引：1  

Xu-kun Su  Shi-kui Dong  Shi-liang Liu  Yu Wu  Xue-xia Wang  Yong Zhang  Xiao-yu Wu 《山地科学学报》2016,13(1):157-168

Arjinshan National Nature Reserve (ANNR) is one of 3 refuges of the endemic ungulates Tibetan wild ass (Equus kiang), Chiru (Pantholops hodgsonii) and wild yak (Bos mutus) that are endangered by natural and anthropogenic factors in the Qinghai-Tibetan Plateau (QTP). Identifying habitat suitability is critical for species protection management. We used a GIS-based niche model to delimit and classify habitat suitability using an integrated assessment system, which included 9 biotic and abiotic factors. We divided the research area into 4 habitat types for these ungulates: (1) high suitability habitat; (2) moderate suitability habitat; (3) low suitability habitat; and (4) unsuitable area. Results suggested that chiru have the most areas of high and moderate suitability habitats while Tibetan wild ass had the largest areas of low suitability habitat and unsuitable area. Wild yak had the largest area of moderate and low suitability habitat, but high suitability habitats for wild yak were smaller than those of other 2 ungulates. There was overlap of high-quality habitat for the three kinds of ungulates in the vicinity of Kardun inspection station, which could be regarded as the core area for the coexistence and conservation of these endangered ungulate populations.  相似文献   

Landslide susceptibility assessment of the region affected by the 25 April 2015 Gorkha earthquake of Nepal   总被引：3，自引：2，他引：1  

Amar Deep Regmi  Megh Raj Dhital  Jian-qiang Zhang  Li-jun Su  Xiao-qing Chen 《山地科学学报》2016,13(11):1941-1957

Nepal was hit by a 7.8 magnitude earthquake on 25^th April, 2015. The main shock and many large aftershocks generated a large number of coseismic landslips in central Nepal. We have developed a landslide susceptibility map of the affected region based on the coseismic landslides collected from remotely sensed data and fieldwork, using bivariate statistical model with different landslide causative factors. From the investigation, it is observed that most of the coseismic landslides are independent of previous landslides. Out of 3,716 mapped landslides, we used 80% of them to develop a susceptibility map and the remaining 20% were taken for validating the model. A total of 11 different landslide-influencing parameters were considered. These include slope gradient, slope aspect, plan curvature, elevation, relative relief, Peak Ground Acceleration (PGA), distance from epicenters of the mainshock and major aftershocks, lithology, distance of the landslide from the fault, fold, and drainage line. The success rate of 87.66% and the prediction rate of 86.87% indicate that the model is in good agreement between the developed susceptibility map and the existing landslides data. PGA, lithology, slope angle and elevation have played a major role in triggering the coseismic mass movements. This susceptibility map can be used for relocating the people in the affected regions as well as for future land development.  相似文献   

Geo-engineered buffer capacity of two-layered absorbing system under the impact of rock avalanches based on Discrete Element Method   总被引：1，自引：0，他引：1  

Yu-zhang Bi  Si-ming He  Xin-po Li  Yong Wu  Qiang Xu  Chao-jun Ouyang  Li-Jun Su  Hao Wang 《山地科学学报》2016,13(5):917-929

Many rock avalanches were triggered by the Wenchuan earthquake on May 12, 2008 in southwest China. Protection galleries covered with a single soil layer are usually used to protect against rockfall. Since one-layer protection galleries do not have sufficient buffer capacity, a two-layered absorbing system has been designed. This study aims to find whether an expanded poly-styrol (EPS) cushion, which is used in the soil-covered protection galleries for shock absorption, could be positioned under dynamic loadings. The dynamic impacts of the two-layered absorbing system under the conditions of rock avalanches are numerically simulated through a 2D discrete element method. By selecting reasonable parameters, a series of numerical experiments were conducted to find the best combination for the two-layered absorbing system. The values of the EPS layer area as a percentage of the total area were set as 0% (S₁), 22% (S₂), and 70% (S₃). 22% of the area of the EPS layer was found to be a reasonable value, and experiments were conducted to find the best position of the EPS layer in the two-layered absorbing system. The numerical results yield useful conclusions regarding the interaction between the impacting avalanches and the two-layered absorbing system. The soil layer can absorb the shock energy effectively and S₂ (0.4-m thick EPS cushion covered with soil layer) is the most efficient combination, which can reduce the impact force, compared with the other combinations.  相似文献   

Diethylstilbestrol in fish tissue determined through subcritical fluid extraction and with GC-MS     

Qinghui?Qiao  Nianrong?Shi  Xiaomei?FengEmail author  Jie?Lu  Yuqian?HanEmail author  Changhu?Xue 《中国海洋大学学报(英文版)》2016,15(3):489-494

As the key point in sex hormone analysis, sample pre-treatment technology has attracted scientists' attention all over the world, and the development trend of sample preparation forwarded to faster and more efficient technologies. Taking economic and environmental concerns into account, subcritical fluid extraction as a faster and more efficient method has stood out as a sample pre-treatment technology. This new extraction technology can overcome the shortcomings of supercritical fluid and achieve higher extraction efficiency at relatively low pressures and temperatures. In this experiment, a simple, sensitive and efficient method has been developed for the determination of diethylstilbestrol(DES) in fish tissue using subcritical 1,1,1,2-tetrafluoroethane(R134a) extraction in combination with gas chromatography-mass spectrometry(GC-MS). After extraction, freezing-lipid filtration was utilized to remove fatty co-extract. Further purification steps were performed with C_(18) and NH_2 solid phase extraction(SPE). Finally, the analyte was derived by heptafluorobutyric anhydride(HFBA), followed by GC-MS analysis. Response surface methodology(RSM) was employed to optimizing the extraction condition, and the optimized was as follows: extraction pressure, 4.3 MPa; extraction temperature, 26℃; amount of co-solvent volume, 4.7 m L. Under this condition, at a spiked level of 1, 5, 10 μg kg~(-1), the mean recovery of DES was more than 90% with relative standard deviations(RSDs) less than 10%. Finally, the developed method has been successfully used to analyzing the real samples.  相似文献   

自动土壤墒情监测管理系统设计与应用     

李翠娜  王柏林  张广周  吴苏 《气象科技》2016,44(3):381-386

为了提升省级自动土壤墒情观测管理能力,开发了C/S结构土壤墒情监测管理系统,实现了对不同厂家3种类型的土壤墒情观测设备数据的统一收集、处理和入库管理业务。系统具有数据质量控制、监控预警以及数据应用等功能,基层台站业务人员可以通过局域网或因特网实时了解和分析当地及全省土壤墒情变化,为农业生产提供了有力、可靠的服务信息。通过业务试用,系统运行稳定,可显著提高土壤墒情观测数据质量和设备技术保障水平,具有广阔的推广空间和应用前景。  相似文献