Influence of the Growth of Earth’s Solid Core on the Effective Geodynamo     

Reshetnyak  M. Yu. 《Doklady Earth Sciences》2021,496(2):151-154

Doklady Earth Sciences - A model of the Earth’s cooling, which describes the formation of a solid core, is considered. Its formation enhances the convection due to additional energy sources...  相似文献   

The First 147Sm–143Nd Data on Rocks from the 6925.2- to 8250-m Interval of the SG-7 Superdeep Borehole (West Siberian Oil-and-Gas Province)     

Ronkin  Yu. L.  Karaseva  T. V.  Maslov  A. V. 《Doklady Earth Sciences》2021,496(2):130-134

Doklady Earth Sciences - The 147Sm–143Nd systematics of 14 samples of basalts, tuffs, silicites, and dolerites from the interval 6925.2–8250 m of the SG-7 superdeep borehole (En-Yakha),...  相似文献   

Results of the Study of Zircon (SIMS) from Granitoids of the Konstantinovskii Stock (Area of the Sukhoi Log Gold Deposit): Age,Sources, and Geological Consequences     

Rytsk  E. Yu.  Tolmacheva  E. V.  Velikoslavinsky  S. D.  Kuznetsov  A. B.  Rodionov  N. V.  Andreev  A. A.  Fedoseenko  A. M. 《Doklady Earth Sciences》2021,496(2):146-150

Doklady Earth Sciences - The results of U–Pb geochronological (SIMS) study of zircons from granitoids of the Konstantinovskii Stock located 6 km from the Sukhoi Log gold deposit are reported....  相似文献   

The Strong Earthquake in Sakhalin Island in September 13, 2020     

Konovalov  A. V.  Khanchuk  A. I.  Stepnov  A. A.  Stepnova  Yu. A. 《Doklady Earth Sciences》2021,497(1):242-245

Doklady Earth Sciences - The seismotectonic position of the strong earthquake that occurred in the southern part of Sakhalin Island on September 13, 2020, is considered. The maximum shaking...  相似文献   

Field study on the behavior of pre-bored grouted planted pile with enlarged grout base     

Zhou  Jia-jin  Yu  Jian-lin  Gong  Xiao-nan  El Naggar  M. Hesham  Zhang  Ri-hong 《Acta Geotechnica》2021,16(10):3327-3338

This paper presents the results of field tests performed to investigate the compressive bearing capacity of pre-bored grouted planted (PGP) pile with enlarged grout base focusing on its base bearing capacity. The bi-directional O-cell load test was conducted to evaluate the behavior of full scale PGP piles. The test results show that the pile head displacements needed to fully mobilize the shaft resistance were 5.9% and 6.4% D (D is pile diameter), respectively, of two test piles, owing to the large elastic shortening of pile shaft. Furthermore, the results demonstrated that the PHC nodular pile base and grout body at the enlarged base could act as a unit in the loading process, and the enlarged grout base could effectively promote the base bearing capacity of PGP pile through increasing the base area. The normalized base resistances (unit base resistance/average cone base resistance) of two test piles were 0.17 and 0.19, respectively, when the base displacement reached 5% D_b (D_b is pile base diameter). The permeation of grout into the silty sand layer under pile base increased the elastic modulus of silty sand, which could help to decrease pile head displacement under working load.

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Basal stability analysis of braced excavations in anisotropic and non-homogeneous undrained clay using streamline velocity fields     

Huang  Maosong  Wang  Hongyu  Tang  Zhen  Yu  Jian 《Acta Geotechnica》2021,16(4):1175-1186

Acta Geotechnica - A basal heave stability analysis in anisotropic and non-homogeneous undrained clay by using the kinematic approach of limit analysis is presented. The proposed failure mechanism...  相似文献   

全民所有自然资源资产管理考核评价机制与方法研究     

周玉  邹朝晖 《上海国土资源》2021,(1):90-94

本文采用对比分析与归纳分析法,在明确全民所有自然资源资产管理考核评价机制定位的基础上,充分借鉴和参考现有相关考核评价制度的设计思路,围绕“考核谁、谁来考、怎么考、考什么、结果怎么定、结果怎么用”等关键问题,从考核评价对象和实施主体、考核评价方式和实施、考核评价结果应用、考核评价内容和指标体系构建、考核评价结果评定方法等方面,提出构建全民所有自然资源资产管理考核评价机制和方法的思路,为推进生态文明建设和自然资源资产产权制度改革提供支撑。  相似文献   

Landslide susceptibility zonation method based on C5.0 decision tree and K-means cluster algorithms to improve the efficiency of risk management   总被引：1，自引：0，他引：1  

Zizheng Guo  Yu Shi  Faming Huang  Xuanmei Fan  Jinsong Huang 《地学前缘(英文版)》2021,12(6):243-261

Machine learning algorithms are an important measure with which to perform landslide susceptibility assessments,but most studies use GIS-based classification methods to conduct susceptibility zonation.This study presents a machine learning approach based on the C5.0 decision tree(DT)model and the K-means cluster algorithm to produce a regional landslide susceptibility map.Yanchang County,a typical landslide-prone area located in northwestern China,was taken as the area of interest to introduce the proposed application procedure.A landslide inventory containing 82 landslides was prepared and subse-quently randomly partitioned into two subsets:training data(70％landslide pixels)and validation data(30％landslide pixels).Fourteen landslide influencing factors were considered in the input dataset and were used to calculate the landslide occurrence probability based on the C5.0 decision tree model.Susceptibility zonation was implemented according to the cut-off values calculated by the K-means clus-ter algorithm.The validation results of the model performance analysis showed that the AUC(area under the receiver operating characteristic(ROC)curve)of the proposed model was the highest,reaching 0.88,compared with traditional models(support vector machine(SVM)=0.85,Bayesian network(BN)=0.81,frequency ratio(FR)=0.75,weight of evidence(WOE)=0.76).The landslide frequency ratio and fre-quency density of the high susceptibility zones were 6.76/km2 and 0.88/km2,respectively,which were much higher than those of the low susceptibility zones.The top 20％interval of landslide occurrence probability contained 89％of the historical landslides but only accounted for 10.3％of the total area.Our results indicate that the distribution of high susceptibility zones was more focused without contain-ing more"stable"pixels.Therefore,the obtained susceptibility map is suitable for application to landslide risk management practices.  相似文献   

Liquid bridge contribution to shear behavior of unsaturated soil: modeling and application to a micromechanics model     

Fukushima  Yo  Higo  Yosuke  Matsushima  Takashi  Otake  Yu 《Acta Geotechnica》2021,16(9):2693-2711

Acta Geotechnica - Liquid bridges in unsaturated soils attach to grain contacts and contribute to strengthening microscopic bonding forces, which leads to macroscopic high strength and stiffness...  相似文献   

两次强降水过程雨滴谱特征及差异     

李侠丽  潘先洁  童应祥  倪婷  黄国贵  李景安  陶杰  姚祎  凌新锋 《气象科技》2019,47(2):322-328

利用寿县观测站内的Parsivel激光雨滴谱仪结合观测站雨量数据及雷达基数据,分析了发生在2015年6月26—30日梅雨期间和2015年8月7—10日超强台风"苏迪罗"影响期间2次强降水过程的雨滴谱结构特征及其差异,拟合了雨强与雷达反射率因子之间的关系。结果表明:雨强的大小直接影响雨滴谱的特征参量,且随着雨强增大而增大;梅雨锋暴雨中1.0mm直径≤1.5mm的粒子所占比例最多,雨强贡献率最大;台风雨中0.75mm直径≤1.0mm的粒子所占比例最多,但1.0mm直径≤1.25mm的粒子对雨强的贡献最大,说明较大粒子对强降水的贡献较大。  相似文献