Results 31 to 40 of about 15,750 (147)

Determination of Hexavalent Chromium in Solid Waste by Inductively Coupled Plasma-Optical Emission Spectrometry with Microwave Digestion

Yankuang ceshi, 2021
BACKGROUND Hexavalent chromium is one of the necessary indices for monitoring the soil environment of solid waste and construction land. OBJECTIVES To establish a simple, accurate and precise method for the determination of Cr(Ⅵ).
ZHAO Qing-ling, LI Qing-cai, TAN Xian-feng, AN Mao-guo, CHEN Juan, MAO Xiu-li   +5 more
doaj   +1 more source

Analysis of the spatiotemporal evolution and driving factors of land use change in Jinan springs area of the Northern Karst region, China from 1986 to 2022

Discover Applied Sciences
The Jinan Spring Area serves as a representative of northern China’s karst regions. To explore the land-use change characteristics and their driving mechanisms, six periods of Landsat series land-use data were collected for the years 1986, 1995, 2000 ...
Shenting Gang, Xiaoyun Kong, Tao Jia, Minghui Lv, Lixia Li   +4 more
doaj   +1 more source

Hydrochemical characteristics and genesis analysis of hot springs in the Changtan area, Chongqing

Carsologica Sinica
This study takes the natural and artificially drilled hot springs as the research objects located in the northwest wing of the Fangdoushan anticline in Changtan Town, Wanzhou District, Chongqing City.
Cao LIU, Gaohai XU, Delong LI, Fuheng LUO, Haifeng XU, Cheng CHEN, Jianshu ZOU   +6 more
doaj   +1 more source

Migration and distribution of complex fracture proppant in shale reservoir volume fracturing

Natural Gas Industry B, 2018
In this paper, a large-scale experimental system was established to identify the migration and distribution laws of complex fracture proppant in shale reservoir volume fracturing.
Linhua Pan, Ye Zhang, Lijun Cheng, Zhaohui Lu, Yuanbo Kang, Pei He, Bingqiang Dong   +6 more
doaj   +1 more source

3D geological model reconstruction and collapse risk evaluation of old goaf in Dunqiu iron mine

Scientific Reports
The complexity of goafs put forward higher requirements for detection methods. A comprehensive detection method for old goaf is proposed, that is, determining the plane distribution range of old goaf by using high-precision magnetic method, determining ...
Hailong Wang, Zhenhua Zhao, Lin Han, Zhenjiang Luo   +3 more
doaj   +1 more source

Analysis on ecological characteristics of Mississippian coral reefs in Langping, Guangxi

Scientific Reports, 2022
Several Late Viséan-Serpukhovian coral reefs were identified in Langping, Tianlin. They provided an opportunity to investigate paleo-environments suitable for the development of reef-building communities and the construction of coral reefs in Langping ...
Dayong Yang, Honglun Chang, Xiao Liu, Peng Wan, Liming Shen   +4 more
doaj   +1 more source

Design of a Full-Ocean-Depth Macroorganism Pressure-Retaining Sampler and Fluid Simulation of the Sampling Process

Journal of Marine Science and Engineering, 2022
Hadal seafloor organisms live under ultra-high pressure, in low temperatures, and other environments for a long time, which puts higher requirements on the structural design of deep-sea biological samplers.
Guangping Liu, Yongping Jin, Youduo Peng, Deshun Liu, Buyan Wan   +4 more
doaj   +1 more source

Occurrence Conditions and Hydrogeochemical Characteristics of High-Temperature Geothermal Resources in the Eastern Jiyang Depression

Yankuang ceshi
The eastern part of the Jiyang Depression possesses high-temperature geothermal resource potential due to the influence of the destruction of the North China craton, but there is a lack of systematic research on the occurrence conditions of high ...
Bo LI, Changsuo LI, Wenfeng GAO, Song YAO, Zhihua LI, Haibo SUI, Haoran LIU, Hongwei WANG   +7 more
doaj   +1 more source

pH-Self-Buffering and Flocculation-Enabled Nonradical Oxidation via Magnesium Hydroxide-Activated Peroxymonosulfate for Selective Organic Pollutant Degradation

Nanomaterials
Peroxymonosulfate (PMS)-based advanced oxidation is often hindered by pH instability and the lack of post-reaction separation. Herein, commercial magnesium hydroxide (Mg(OH)2) is introduced as a multifunctional catalyst to address these limitations.
Yunfeng Zhang, Cheng Zhao, Zhongqun Li, Dexin Kong, Lingshuai Kong   +4 more
doaj   +1 more source

Properties of WC-bronze based matrix material for diamond bit reinforced by multielement nanoparticles

Jin'gangshi yu moliao moju gongcheng, 2022
Nano-NbC and nano-WC were added to the WC-bronze based matrix to improve the performance of the matrix of the impregnated diamond bit. The uniform design method, regression analysis and solver were used to obtain the optimal addition. Laboratory drilling
Si CHANG, Baochang LIU, Wenhao DAI, Viacheslav NESKOROMNYKH, Pavel PETENEV, Marina POPOVA   +5 more
doaj   +1 more source