Results 31 to 40 of about 113,420 (306)

Geochemistry

, 2021
Geochemistry is a branch of geological sciences that deals with chemistry rocks and minerals in various igneous, metamorphic and sedimentary processes, from high to low temperatures and in various environments. Geochemistry is also an important background for a detailed description of rocks' origin and evolution.
Milos René, Gemma Aiello, Gaafar El Bahariya EditorsContributors Ali Ismail AlJuboury, Rana Mahmood, Abulaziz M AlHamdani, Victor Gdalievich Ganelin, Olufemi S Bamigboye, Václav Procházka, Miroslav Zacek, Petr Sulovsky, Tomás Vaculovic, Lenka Rukavicková, Dobroslav Matejjka, Salih Muhammad Muhammad Awadh, Milos René, Gaafar A El Bahariya, Leonardo Gonçalves, Cristiane Gonçalves, Dmitry Vlasov, Elena Panova, Marina Zelenskaya, Oksana Rodina, Alexey Vlasov, Katerina Sazanova, Benjamin Ntieche, Margaret Brocx, Vic Semeniuk, Haofu Zheng, Bo Liu, Kaibo Shi, Gemma Aiello, Pauline Wokwenmendam Nguet, Zakari Nchouwet, Mahomed Aziz Mounjouohou, Daouda Mfepat, Weimin Jiang, Jinxing Yu, Yue Kong, Tong Li, Changhai Li   +39 more
openaire   +4 more sources

Probability prediction of true‐triaxial compressive strength of intact rocks based on the improved PSO‐RVM model

Deep Underground Science and Engineering, EarlyView.
In this work, we propose an improved particle swarm optimization (PSO) algorithm and develop an improved PSO‐relevance vector machine (RVM) model as a substitute for traditional true‐triaxial testing. The model's high prediction accuracy was validated through comparisons with two other machine learning methods and five three‐dimensional Hoek–Brown type
Qi Zhang, Maohui Wang, Ning Wang, Yixin Shen, Xuzhen He   +4 more
wiley   +1 more source

Agronomic and Genetic Strategies to Enhance Selenium Accumulation in Crops and Their Influence on Quality

Foods, 2023
Selenium (Se) is an essential trace element that plays a crucial role in maintaining the health of humans, animals, and certain plants. It is extensively present throughout the Earth’s crust and is absorbed by crops in the form of selenates and selenite,
Bingqi Zhou, Haorui Cao, Qingqing Wu, Kang Mao, Xuefeng Yang, Junxia Su, Hua Zhang   +6 more
doaj   +1 more source

Study on the failure mechanism of the shield excavation face in the sandy cobble stratum under different buried depths

Deep Underground Science and Engineering, EarlyView.
Abstract One of the significant challenges faced in shield tunnel construction is the risk of collapse resulting from abrupt changes in soil conditions in advance of the working face, particularly within the sandy cobble stratum. This study aims to effectively manage these sudden variations and to further investigate the failure mechanisms associated ...
Hua Jiang, Chongyang Liu, Ao Zhang, Xiaoyan Zhang, Yuhang Li   +4 more
wiley   +1 more source

Seasonal variations in metallic mercury (Hg⁰) vapor exchange over biannual wheat–corn rotation cropland in the North China Plain [PDF]

Biogeosciences, 2016
Air–surface gas exchange of Hg0 was measured in five approximately bi-weekly campaigns (in total 87 days) over a wheat–corn rotation cropland located on the North China Plain (NCP) using the relaxed eddy accumulation (REA) technique.
J. Sommar, W. Zhu, L. Shang, C.-J. Lin, X. Feng   +4 more
doaj   +1 more source

Chlorine isotopic compositions of deep saline fluids in Ibusuki coastal geothermal region, Japan: using B–Cl isotopes to interpret fluid sources [PDF]

, 2015
We report chlorine stable isotopic compositions (δ37Cl, expressed in ‰ relative to the standard mean ocean chloride) as well as δ2H and δ18O values of deep saline fluids taken at eight drill-holes reaching from 73 to 780 m below sea level in the Ibusuki ...
General geochemistry, Geochemistry, Oi, Takao, Kreulen, Rob, Musashi, Masaaki   +4 more
core   +1 more source

Effect of confining pressure on fracture characteristics and mineralogical behavior of tight sandstone specimens after hydraulic fracturing

Deep Underground Science and Engineering, EarlyView.
Hydraulic fracturing in tight sandstone and fracture propagation characteristics using backscattered electron‐scanning electron microscope (BSE‐SEM) images. Abstract This study focuses on hydraulic fracturing experiments conducted under triaxial conditions on tight sandstone specimens from Shivpuri district, Madhya Pradesh, India.
Pankaj Rawat, Narendra Kumar Samadhiya
wiley   +1 more source

Optimization of cut‐hole layout under high in situ stress based on numerical simulation and field tests

Deep Underground Science and Engineering, EarlyView.
This study investigates the blast‐induced rock damage patterns under different cut‐hole layouts and ground stress conditions through numerical simulations and field tests. The findings in this study provide valuable insights for similar underground engineering applications.
Junjie Zhao, Diyuan Li, P. G. Ranjith, Xinxin Lü, Yanliang Li, Xiaoli Su   +5 more
wiley   +1 more source

Resonance‐induced restoration of rock permeability degraded by heavy components of crude oil

Deep Underground Science and Engineering, EarlyView.
Resonance‐induced changes occur in filtration properties of sedimentary rocks in crude paraffin oil flow under acoustic vibrations. Experimental data on (a) pressure drop; (b) permeability; (c) pressure at the rock inlet; and (d) pressure at the rock outlet are presented.
Evgenii Riabokon, Qian Yin, Mikhail Guzev, Mikhail Turbakov, Evgenii Kozhevnikov, Nadezhda Riabokon, Ivan Panteleev   +6 more
wiley   +1 more source

Sulfur partitioning between aqueous fluids and felsic melts at high pressures: Implications for sulfur migration in subduction zones

Scientific Reports
Sulfur (S), an essential volatile in subduction zone magmatism, exhibits higher solubility in aqueous fluids compared to silicate melts. Despite its importance, the partitioning of S between aqueous fluids and silicate melts under the conditions of ...
Lanqin Li, Xingcheng Liu, Ting Xu, Xiaolin Xiong, Jintuan Wang, Li Li   +5 more
doaj   +1 more source