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arXiv 2024年

作者： Pan, Xiao L. Song, Hong X. Wang, H. Wu, F.C. Gan, Y.C. Chen, Xiang R. Chen, Ying Geng, Hua Y. National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid Physics China Academy of Engineering Physics Mianyang Sichuan621900 China College of Physics Sichuan University Chengdu610065 China HEDPS Center for Applied Physics and Technology College of Engineering Peking University Beijing100871 China Fracture and Reliability Research Institute School of Engineering Tohoku University Sendai980-8579 Japan

U-based binary alloys have been widely adopted in fast nuclear reactors, but their stability under extreme conditions of high-pressure is almost unknown, mounting up to latent risk in applications. Here, possible ordered phases in U-Zr system up to 200 GPa are comprehensively investigated by unbiased first-principles structure prediction. Stable U2Zr, metastable U3Zr and U4Zr phases are discovered for the first time, which exhibit strong stability under compression. They all are metallic, with 5f electrons of uranium dominating the electronic density of states near the Fermi level. Prominent ionic interactions between U and Zr atoms, as well as covalent interactions between adjacent uranium atoms, are found. The same strategy is applied to explore the stability of ordered phases in other U-based binary transition metal alloys, U-X (X= Sc, Ti, V, Cr, Y, Nb, Mo, Hf, Ta, W). Stable and metastable ordered phases similar to U-Zr alloy are unveiled, all with similar electronic structures. For these alloys, we find that the structure of U2X (X=Zr, Ti, Hf) hosts a unique hybrid phase transition similar to U2Nb, which is a superposition of a first-order transition and a second-order transition. The prediction of these novel phases not only refutes the stability of the long-believed ordered phase I4/mmm-U2Mo, but also rewrites the phase diagrams of U-X (X= Zr, Sc, Ti, V, Cr, Nb, Mo, Hf, Ta) alloys under high pressure. All of these findings promote our understanding of the high-pressure behavior of the broad category of U-based binary alloys with transition metals. © 2024, CC BY.

关键词： Binary alloys

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Peroxymonosulfate Oxidation of Antibiotics Enhanced by Chloride Ion in Wastewater Under Different environmental Temperature and Ph

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SSRN 2024年

作者： Wei, Yulei Bao, Jie Lu, Zhiqi He, Xianglong Cui, Shuangshuang Li, Hongjing Song, Weihua Ma, Jun Department of Environmental Science & Engineering Fudan University Shanghai200433 China Suzhou New District Water Purification Co. Ltd Suzhou215000 China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin150090 China

The antibiotics and chloride ions (Cl−) coexist in the effluent of wastewater treatment plants (WWTPs). Peroxymonosulfate (PMS) oxidation of representative antibiotics enhanced by Cl− at relevant levels in wastewater under different environmental temperature and pH was studied. The second-order reaction rate constants of Cl− with PMS ranged from 0.52 × 10-3 to 2.33 × 10-3 M-1 s-1 (10 - 30 °C), and decreased from 1.97 × 10-3 to 0.65 × 10-3 M-1 s-1 when pH increased from 4 to 10. The kinetic model and experiments indicated that hypochlorous acid (HClO) and singlet oxygen (1O2) were major reactive species in the Cl−/PMS system. The degradation of sulfadiazine (SDZ) and oxytetracycline (OTC) were significantly accelerated by Cl−/PMS system, and HClO played a leading role in the presence of Cl−, whereas 1O2 dominated in the coexistence of Cl− and effluent organic matter. The concentrations of chlorinated by-products generated during SDZ and OTC oxidation by PMS were 0.99 - 16.97 μg/L. In secondary effluent obtained from a WWTP, the degradation rates of SDZ and OTC exhibited a positive correlation with increasing environmental temperature, and were relatively higher at pH 5.0 - 7.0. This work provides new insights into the effects of different environmental temperature and pH on PMS oxidation of antibiotics enhanced by Cl− in secondary effluent of WWTPs. © 2024, The Authors. All rights reserved.

关键词： Antibiotics

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The role of charged dust particles on conductivity in polar mesosphere summer echoes regions 13

The role of charged dust particles on conductivity in polar ...

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13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Rauf, Abdur Ji, Xinliang Li, Hailong Ullah, Safi Wang, Maoyan Ge, ShuCan Meng, Lin University of Electronic Science and Technology of China School of Electronic Science and Engineering Chengdu610054 China Terahertz Science and Technology Key Laboratory of Sichuan Province Chengdu610054 China School of Physics University of Electronic Science and Technology of China Chengdu610054 China National Key Laboratory of Electromagnetic Environment China Research Institute of Radiowave Propagation Qingdao266107 China

ISBN: (纸本)9781665418126

The effects of electron bite-outs caused by charged dust particles on the effective collision frequencies, Parallel, and Pederson conductivities are studied by introducing the collision frequency of electrons and charged dust particles. It is found that considering the collision frequency of electrons and charged dust particles alters the conductivity, particularly in the electron bite- out regions. © 2021 IEEE.

关键词： Electrons

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Recent progresses on designing and manufacturing of bulk refractory alloys with high performances based on controlling interfaces

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Journal of Materials Science & technology 2020年第17期52卷 29-62页

作者： T.Zhang H.W.Deng Z.M.Xie R.Liu J.F.Yang C.S.Liu X.P.Wang Q.F.Fang Y.Xiong School of Physics and Electronic Engineering Guangzhou UniversityGuangZhou 510006China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China State Key Laboratory of Environment Friendly Energy Materials West South University of Sciences and TechnologyMianYang 621010China

Refractory alloys such as tungsten and molybdenum based alloys with high strength,thermal/electrical conductivity,low coefficient of thermal expansion and excellent creep resistances are highly desirable for applications in nuclear facilities,critical components in aerospace and defense ***,the serious embrittlement limits the engineering usability of some refractory alloys.A lot of research results indicate that the performances of refractory alloys are closely related to the physical/chemical status,such as the interface dimension,interface type,interface composition of their grain boundaries(GBs),phase boundaries(PBs)and other interface *** paper reviewed the recent progress of simulations and experiments on interface design strategies that achieve high performance refractory *** strategies include GB interface purifying/strengthening,PB interface strengthening and PB/GB synergistic *** details are provided on the design/fabrication strategy such as GB interface controlling,PB interface controlling and synergistic control of multi-scaled *** corresponding performances such as the mechanical property,thermal conductivity,thermal load resistance,thermal stability,irradiation resistance,and oxidation resistance are reviewed in the aspect to the effect of *** addition,the relationships between these interfaces and material properties are ***,future developments and potential new research directions for refractory alloys are proposed.

关键词： Interface controlling Designing and manufacturing Refractory alloys Structure and performance

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Hydrogeochemical facies analysis of groundwater at parts of south-western Bangladesh: a case study

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Arabian Journal of Geosciences 2023年第12期16卷 1-17页

作者： Rahman, M. Moklesur Mahmud, Azhar Amin, Md. Al Hossain, Md. Shahadat Bai, Ling Shaibur, Molla Rahman Rahman, Md. Aliur Khan, Abu Shamim Department of Petroleum and Mining Engineering Jashore University of Science and Technology Jashore Bangladesh State Key Laboratory of Tibetan Plateau Earth System Environment and Resources (TPESER) Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China Department of Environmental Science and Technology Jashore University of Science and Technology Jashore Bangladesh Asia Arsenic Network Jashore Bangladesh

This study was carried out with the objective of quantifying the concentrations of various physicochemical parameters of the groundwater (GW) and evaluating the interactions between the GW and the carrier rocks. Forty-two (42) GW samples were collected from different tube wells distributed in and around the Jashore University of Science and technology (JUST) campus. The result showed that the cations and anions follow the order of Ca2+, Mg2+, Na+, K+, and HCO3-, Cl-, and SO42-, respectively, for most cases. In general, the GW was found to be slightly alkaline and hard to very hard. More than 50% of samples exceeded the permissible limit of arsenic and manganese contents. The Water Quality Index (WQI) represented that 60% of waters are good to excellent in categories as per World Health Organization (WHO) guidelines. The Pearson correlation showed statistically significant correlations between each pair of parameters, with maximum positive and negative r values of 0.80 and -0.54, respectively. The Principal Component Analysis (PCA) produced the six principle components among the 21 tested parameters (20 physicochemical and 1 is biological), which accounted for more than 81% of the total variance. Varius plots such as Piper, Durov, and Stiff Patterns suggested that the hydrogeochemical facies was dominated by the Ca-Mg-HCO3 water type. Finally, it was observed that the GW quality parameters in the Southwestern region of Bangladesh were governed mostly by the geochemical process of rock-water interaction, whereas the chemical weathering (dissolution) of calcite minerals was followed by the weathering of silicate minerals.

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Molybdenum Doping Leads to Faster Photo-Dissolution of Commercial Molybdate Red Pigment than Chrome Yellow Pigment Under Sunlight Irradiation

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SSRN 2024年

作者： Liu, Huiting Zhang, Shuangshuang Qu, Xiaolei Fu, Heyun Zuo, Linzi School of Environmental and Chemical Engineering Shenyang Ligong University Liaoning 110159 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu210023 China Analysis and Test Center Guangdong University of Technology Guangzhou510006 China

The photo-dissolution of lead chromate pigments poses specific environmental hazards. In particular, the presence of molybdenum in lead chromate molybdate pigments, commonly known as molybdate red, might increase the risk of heavy metal leaching when exposed to light. Our study demonstrates that commercial molybdate red pigments can undergo photo-dissolution when exposed to simulated sunlight and exhibit lower photostability compared to lead chromate pigments such as chrome yellow. After 24 hours of irradiation, the leaching rates of toxic lead (Pb) and chromium (Cr)from molybdate red pigments are 2.98 and 3.70 times higher, respectively, than those from chrome yellow pigments under identical conditions. Molybdate red pigment also exhibits a faster initial release rate of heavy metals. The primary factor leading to decreased pigment photostability is the activation of pigment semiconductors facilitated by molybdenum (Mo)doping. Molybdate red pigments, unlike conventional chrome yellow pigments, exhibit a broader light absorption spectrum and more effective separation and transfer of photogenerated charge carriers. This ultimately boosts the photochemical activity of molybdate red pigments in aqueous environments. Overall, this study indicates that Mo doping can reduce the photostability of lead chromate pigments, highlighting the potential for increased environmental risks associated with complex inorganic metal pigments. © 2024, The Authors. All rights reserved.

关键词： Dissolution

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Enhancing Intracellular Antibiotic Resistance Genes Removal Via the Synergistic Effect of Hydroxyl Radicals and Singlet Oxygen in the Electrochemical Membrane-Naclo System

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SSRN 2025年

作者： Zhang, Bo Zhang, Yunxin Kong, Bo Wang, Zhiguo Li, Jizhen Lu, Jiajun Ma, Defang Wang, Yan Technology Center China Tobacco Hunan Industrial Co. Ltd. Changsha410007 China Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao China School of Environment Beijing Normal University China

Antibiotic resistance genes (ARGs) are frequently detected in a variety of aquatic environments and pose potential threats to public health and ecosystems. This study explored the removal of ARGs using two electrochemical membranes: CeO2-O@CNT membrane (prepared in air) and CeO2-Ar@CNT membrane (prepared in argon). Compared with the CeO2-O@CNT membrane, the CeO2-Ar@CNT membrane demonstrated a lower equivalent polarization resistance and a higher electrochemical reaction rate, leading to higher production of singlet oxygen (¹O₂) when integrated with NaClO. Owing to the synergistic effect of •OH and ¹O₂, the CeO2-Ar@CNT-NaClO system achieved enhanced removal of intracellular ARGs (sul1, tetA, intI1, and 16S rRNA) compared to the CeO2-O@CNT-NaClO system. The synergistic mechanism between •OH and ¹O₂ involves the initial damage to the cell membrane by •OH, which subsequently allows ¹O₂ to penetrate into the cells and directly oxidize the intracellular ARGs. Although the CeO2-O@CNT-NaClO system produced insufficient ¹O₂ for directly oxidizing intracellular ARG, it achieved comparable removal efficiencies for extracellular ARGs as the CeO2-Ar@CNT-NaClO system, driven by •OH. This study offers theoretical support for the optimization of electrochemical membranes with the aim of curbing the spread of antibiotic resistance. © 2025, The Authors. All rights reserved.

关键词： Antibiotics

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Remarkable Ability of Pb(Ii) Capture from Water by Self-Assembled Metal-Phenolic Networks Prepared with Tannic Acid and Ferric Ions

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SSRN 2022年

作者： Yang, Luyang Qiu, Hui Ni, Wenxiang Zhang, Qingrui Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology 219 Ningliu Road Nanjing210044 China State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China

The plant-derived chelators used for heavy metals removal have attracted increasing attention due to the low cost, strong coordination effect and environmental-benign feature. Herein, the natural polyphenol-based adsorbents (TA-Fe7 & TA-Fe12) were prepared with tannic acid (TA) and Ferric ions through a simple cross-linking self-assembly reaction at pH 7 and 12, respectively. Adsorption isotherms demonstrated that TA-Fe12 shows better adsorption ability towards Pb(II) than TA-Fe7 with the maximum adsorption capacity of 357.1 mg/g at 298 K, which can be attributed to the coordination between Pb(II) and phenolic hydroxyl groups of TA as well as the specific affinity of newly-formed iron oxides toward Pb(II). The evaluation of adsorption affinity indicated that the distribution coefficients Kd of TA-Fe12 for Pb(II) was apparently higher than other cations, revealing the excellent adsorptive selectivity of TA-Fe12 towards Pb(II). XPS study indicated that the better performance for TA-Fe12 can be attributed to the coordination between Pb(II) and phenolic hydroxyl groups on TA as well as the specific affinity of newly-formed iron oxides towards Pb(II). Fixed-bed tests indicated that the TA-Fe12 column can successively produce clean water with bed volumes of 9500 and 7860 ([Pb] 12 could be fully refreshed by 0.1 M HNO3 solution and retained constant adsorption efficiency in 10 adsorption-regeneration cycles. © 2022, The Authors. All rights reserved.

关键词： Adsorption

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Application of Dispersive Liquid-Liquid Extraction Followed by Rapid and Direct Mass Spectrometry Analysis to Evaluate Parabens in Seawater

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SSRN 2023年

作者： Jiang, Jie Bian, Xiaoyuan Zhang, Hong Zhang, Meng Yu, Kai Kan, Guangfeng Feng, Yu Wang, Xiaofei Jiang, Yanxiao State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Heilongjiang Harbin150090 China School of Chemistry and Chemical Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China School of Marine Science and Technology Harbin Institute of Technology at Weihai Shandong Weihai264209 China

A sensitive and accurate ultrasound-assisted liquid-liquid extraction (LLE) method, followed by a combination of nanoscale electrospray mass spectrometry detection technique, is proposed to determine the presence of preservatives in seawater samples. The method uses only one extraction solvent for liquid-liquid extraction of seawater samples, hindering the desorption/ionization of salts to achieve desalination, and therefore, greatly enhancing the signal intensity of the target analytes in the mass spectrometry. The type of extraction solvent, the volume ratio of sample to organic phase, the ultrasound-assisted extraction time, and the type of nano-tube and ionization voltage used in the nanoscale electrospray mass spectrometry analysis were optimized. Under optimal conditions, this proposed method was effectively implemented for the detection of five parabens in real seawater samples. The results showed that the limits of detection (LODs) lied within the range of 0.79 - 5.71 ng mL-1. The linear range was 50-2000 ng mL-1, with the relative standard deviations of less than 15.5% for all parabens. The results show that the combination of LLE and nanoscale electrospray technology is a simple, sensitive and rapid method for detecting analytes in real seawater. © 2023, The Authors. All rights reserved.

关键词： Ultrasonic applications

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The Influence of Casing Insulation Coatings on Electromagnetic Field Distributions in Current Injection Ranging

The Influence of Casing Insulation Coatings on Electromagnet...

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Energy engineering and Power Systems (EEPS), International Conference on

作者： Pei Wu Jingxin Dang Ling Yang Bo Dang School of Electronic Engineering Xi'an Shiyou University Xi'an Shaanxi China School of resources and environment University of Electronic Science and Technology of China Chengdu China Key Laboratory of Education Ministry for Photoelectric Logging and Detecting of Oil and Gas Xi'an Shiyou University Xi'an China

ISBN: (数字)9798350375138

ISBN: (纸本)9798350375145

Currently, the electromagnetic ranging system of relief well based on injection current method has been applied in practice. Given the exacting demands for ranging precision in relief well detection, this study establishes an electromagnetic detection model for target well casings with surface insulation coating. The results show that the insulating coating on the surface of the casing of the target well can reduce the leakage of current on the casing and make the current flowing from the excitation electrodes converge in large quantities inside the casing coupling and the casing, which can be utilized to increase the magnitude of the converging currents and the detection signals, and to increase the ranging distance. The model and research findings presented in this paper provide valuable theoretical reference and guidance for error analysis in electromagnetic ranging technology for relief wells.

关键词： Couplings Insulation Error analysis Error compensation Distance measurement Software Power systems Coatings Electromagnetics Surface treatment

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