作者机构：
[He, Xing-Zi; Guo, Yu; Liu, Yuan-Xin; Zeng, Yao-Fu; Xu, Xiao-Feng] Univ South China, Hengyang Med Sch, Sch Pharmaceut Sci, Hunan Prov Key Lab Tumor Microenvironm Respons Dr, Hengyang 421001, Hunan, Peoples R China.;[Guo, Lu] Univ South China, Hengyang Med Sch, Affiliated Nanhua Hosp, Dept Sports Med, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Prof. Yu Guo; Dr. Yao-Fu Zeng] S;School of Pharmaceutical Science, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001 China
摘要：
Herein, we report a silver-catalyzed regioselective alkylation of chromones with alkyl carboxylic acids under mild conditions. Various alkyl groups including tert-butyl, cyclohexyl especially adamantyl could be successfully installed at C2 site of chromones in moderate to good yields. A gram-scale experiment was conducted and a plausible mechanism was proposed.
作者机构：
[Wu, Qun-Yan; Chai, Zhi-Fang; Luan, Xue-Fei; Wang, Cong-Zhi; Lan, Jian-Hui; Shi, Wei-Qun] Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China.;[Xia, Liang-Shu; Luan, Xue-Fei] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Cong-Zhi Wang; Wei-Qun Shi] L;[Liang-Shu Xia] S;Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang 421001, Hunan Province, China
通讯机构：
[Hongmei Zhu; Changjun Qiu] H;Hunan Provincial Key Laboratory of Advanced Laser Manufacturing Technology, University of South China, Hengyang, People’s Republic of China<&wdkj&>Hunan Provincial Key Laboratory of Advanced Laser Manufacturing Technology, University of South China, Hengyang, People’s Republic of China
摘要：
In this study, the influence of different laser scanning strategies on substrate deformation, microstructure and properties of laser-cladded thin-walled 420 martensitic stainless steel (MSS) plate have been carefully investigated. The continuous offset-out scanning strategy (COSS) and continuous raster scanning strategy (CRSS) was compared with the subarea offset-out scanning strategies (SOSS) and subarea raster scanning strategy (SRSS) with different sequences. The results show that the minimum and maximum macroscopic deformation was generated using COSS and CRSS, respectively. The temperature distribution with characteristic of quasi-symmetry was generated by COSS, which can largely suppress the substrate deformation, in marked contrast to a long ellipse symmetry by CRSS. All the laser-cladded 420 MSS layers exhibit lath-martensite microstructure, while some cracks are distributed by using SOSS. The optimal comprehensive performance of the laser-cladded 420 MSS can be obtained using COSS, with smallest outermost deformation of 1.57 mm, superior hardness of 54.9 HRC and wear rate of 0.9626 x 10(-5) mm(3)/N center dot m.
摘要：
Pyrite, a mineral associated with uranium ore, is closely related to uranium leaching. In this study, Ozone micro-nano bubbles (OMNBs), as an environmentally friendly advanced oxidation technology, were used for the first time to oxidize pyrite under experimental conditions to improve the leaching rate of uranium. A laboratory-scale agitation leaching experiment of pyrite was carried out with a pH of 1.0-3.0, gas flow of 1-3 L/min, ozone generation rate of 0.55-2.22 mg/s, and pyrite concentration of 0.1-5.0 g/L for 1 h. By adding three different co-oxidant: Mn(II), Mn(IV), and Fe(III), it was found that only Mn(IV) increased the oxidation rate of pyrite by 21.7%. The results of the scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS) show that the formation of Fe(III)-O film on the surface of the ore suppresses the oxidation rate of pyrite to a certain extent. Pyrite can be rapidly oxidized up to 57.6% by OMNBs, which is beneficial to uranium leaching. This method is expected to be used for in situ acid leaching of uranium with OMNBs injected into the ground. Highlights OMNBs accelerate the oxidation of pyrite compared with air, oxygen micro-nano bubbles, and ozone conventional bubbles. The increase in system acidity, gas flow, and ozone generation rate can accelerate the oxidation of pyrite by OMNBs. The excessively high concentration of iron ions in the system hinders the further oxidation of pyrite to a certain extent.
作者：
Hamza, Mohammed F.;Wei, Yuezhou;Althumayri, Khalid;Fouda, Amr;Hamad, Nora A.
期刊：
Materials,2022年15(13):4676- ISSN：1996-1944
通讯作者：
Mohammed F. Hamza<&wdkj&>Yuezhou Wei
作者机构：
[Wei, Yuezhou; Hamza, Mohammed F.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Hamza, Mohammed F.] Nucl Mat Author, POB 530, Cairo 11728, Egypt.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China.;[Althumayri, Khalid] Taibah Univ, Coll Sci, Dept Chem, Al Madinah Al Munawarah 30002, Saudi Arabia.;[Fouda, Amr] Al Azhar Univ, Fac Sci, Bot & Microbiol Dept, Cairo 11884, Egypt.
通讯机构：
[Mohammed F. Hamza; Yuezhou Wei] A;Authors to whom correspondence should be addressed.<&wdkj&>Nuclear Materials Authority, P.O. Box 530, El-Maadi, Cairo 11728, Egypt<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang 421001, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
摘要：
Antibiotic wastewater contamination poses a major threat to the global environment and human health. In this study, a stable Fe-based metal-organic framework (MOF) doped on g-C3N4 backbone MIL-101(Fe)/g-C3N4 was synthesised using a peroxymonosulfate (PMS)/visible light system to prepare a Fenton-like catalyst. The system showed high activity and stability during PMS heterophase activation for tetracycline hydrochloride (TET) degradation. While having the best PMS activation binding energy. Additionally, the analysis suggests that the surface oxygen functional groups, defective material structure and actives sites for PMS activation provided via MIL-101(Fe)/g-C3N4 oxide adsorption have the best activity and stability for the degradation of TET. Moreover, superoxide radical O-2(center dot-) , sulfate radical SO4 center dot- singlet oxygen O-1(2) and hydroxyl radical (OH)-O-center dot can be used for the efficient degradation of antibiotics and organic compounds in water, with wastewater cycling experiments revealing the catalyst is high chemical stability. Therefore this study proposes a feasible degradation pathway for TET and proviides. new ideas for antibiotic degradation and decontamination using sunlight-powered activators.
作者机构：
[Pang, Min; Chen, Xue-Kun; Liu, Jun; Tan, Jia-Ling] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Xie, Zhong-Xiang] Hunan Inst Technol, Dept Math & Phys, Hengyang 421002, Peoples R China.;[Zhou, Wu-Xing] Hunan Univ Sci & Technol, Sch Mat Sci & Engn, Xiangtan 411201, Peoples R China.;[Zhou, Wu-Xing] Hunan Univ Sci & Technol, Hunan Prov Key Lab Adv Mat New Energy Storage & Co, Xiangtan 411201, Peoples R China.
通讯机构：
[Zhong-Xiang Xie] D;[Wu-Xing Zhou; Jun Liu] S;School of Materials Science and Engineering & Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion, Hunan University of Science and Technology , Xiangtan 411201, China<&wdkj&>School of Mathematics and Physics, University of South China , Hengyang 421001, China<&wdkj&>Department of Mathematics and Physics, Hunan Institute of Technology , Hengyang 421002, China
作者机构：
[Fu, Min; Tao, Zetian; Yang, Yang; Tong, Hua] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Chen, Fanglin] Univ South Carolina, Dept Mech Engn, Columbia, SC 29208 USA.
通讯机构：
[Fanglin Chen] D;[Zetian Tao] S;School of Resources, Environment and Safety Engineering, University of South China, Hengyang, Hunan Province, 421001 China<&wdkj&>Department of Mechanical Engineering, University of South Carolina, Columbia, SC, 29208 USA
摘要：
A BaCexFe1–xO3–δ composite cathode with a heterojunction structure is applied for proton‐conducting solid oxide fuel cells. Oxygen reduction reactivity can be significantly enhanced by tailoring the Ce/Fe ratios. A cell power output of 1525 mW cm–2 at 700 °C is achieved by using a spray method to optimize the cathode microstructure. Abstract A traditional composite cathode for proton‐conducting solid oxide fuel cells (H‐SOFCs) is typically obtained by mixing cathode materials and proton conducting electrolyte of BaCe0.7Y0.2Zr0.1O3–δ (BZCY), providing chemical and thermal compatibility with the electrolyte. Here, a series of triple‐conducing and cobalt‐free iron‐based perovskites as cathodes for H‐SOFCs is reported. Specifically, BaCexFe1–xO3–δ (x = 0.36, 0.43, and 0.50) shows various contents of two single phase perovskites with an in situ heterojunction structure as well as triple conductivity by tailoring the Ce/Fe ratios. The cell performance with the optimized BaCe0.36Fe0.64O3–δ (BCF36) cathode composition reaches 1056 mW cm−2 at 700 °C. Moreover, a record cell performance of 1525 mW cm−2 at 700 °C is obtained by modifying the BCF36 cathode microstructure through a spraying method, demonstrating high promise with Co‐free cathodes for H‐SOFCs.
作者机构：
[Deng, Xuemei; Luo, Tian; Li, Zhao; Wang, Zhen; Liu, Dan] Lanzhou Univ, Sch Pharm, Lanzhou 730000, Gansu, Peoples R China.;[Wang, Zhen] Univ South China, Sch Pharmaceut Sci, Hengyang Med Sch, Hengyang 421001, Hunan, Peoples R China.;[Wen, Huaixiu] Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Tibetan Med Res, Qinghai Prov Key Lab Tibetan Med Res, Xining 810008, Qinghai, Peoples R China.
通讯机构：
[Zhen Wang] S;School of Pharmacy, Lanzhou University, Lanzhou, Gansu 730000, China<&wdkj&>School of Pharmaceutical Science, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, China
通讯机构：
[Zheng, Z.] H;[Chen, S.; Jiang, Z.-X.] S;Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hunan, China;State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, China
作者机构：
[Qin, Ya-guang] Power China Huadong Engn Corp Ltd, Hangzhou 311122, Peoples R China.;[Gu, De-sheng; Yang, Dong-jie; Qin, Ya-guang; Feng, Chun-di; Ma, Shao-wei; Hu, Jian-hua] Cent South Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.;[Bai, Xin] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421000, Peoples R China.
关键词：
grain deformation;in situ XCT;failure behavior;Stokes rotation;material line
摘要：
This work aimed to quantify the physical and mechanical behavior of three-dimensional microstructures in rocks under uniaxial compression. A high-precision in situ XCT (X-ray transmission computed tomography) technology was applied to investigating the behavior of mineral grains in sandstone: the movement, the rotation deformation, and the principal strains between fault zone and non-fault zone. The results indicate that after unloading, the shear strain of mineral grains is periodic in the radial direction, the strain of mineral grains in the fracture zone is about 30 times of the macro strain of the specimen, which is about 5 times in the non-fracture zone, and the shear strain near the fault zone is larger than the compressive strain, and there is the shear stress concentration feature.
期刊：
Risk Management and Healthcare Policy,2022年15:923-934 ISSN：1179-1594
通讯作者：
Jianxiang Qiu<&wdkj&>Zhi-Xin Huang
作者机构：
[Zhang, Wenli; Qiu, Jianxiang; Zhang, Cheng; Huang, Zhi-Xin; Huang, Ying] Guangdong Second Prov Gen Hosp, Dept Neurol, 466 xingang Middle Rd, Guangzhou 510000, Guangdong, Peoples R China.;[Zhang, Wenli; Zhang, Cheng; Huang, Zhi-Xin; Huang, Ying] Southern Med Univ, Sch Clin Med 2, Guangzhou, Guangdong, Peoples R China.;[Qiu, Jianxiang] Guangdong Second Prov Gen Hosp, Med Res Ctr, 466 xingang Middle Rd, Guangzhou 510000, Guangdong, Peoples R China.;[Huang, Zhi-Xin] Jinan Univ, Fac Med Sci, Guangzhou, Guangdong, Peoples R China.;[Huang, Zhi-Xin] Univ South China, Hengyang, Hunan, Peoples R China.
通讯机构：
[Jianxiang Qiu] M;[Zhi-Xin Huang] D;Medical Research Center, Guangdong Second Provincial General Hospital, Guangzhou, Guangdong, People’s Republic of China<&wdkj&>Department of Neurology, Guangdong Second Provincial General Hospital, Guangzhou, Guangdong, People’s Republic of China<&wdkj&>The Second School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong, People’s Republic of China<&wdkj&>Jinan University Faculty of Medical Science, Guangzhou, Guangdong, People’s Republic of China<&wdkj&>University of South China, Hengyang, Hunan, People’s Republic of China
