作者机构：
[Hou, Tie-Jiun] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Yan, Mengshi] Peking Univ, Dept Phys, Beijing 100871, Peoples R China.;[Yan, Mengshi] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China.;[Liang, Jian] South China Normal Univ, Inst Quantum Matter, Guangdong Prov Key Lab Nucl Sci, Guangzhou 510006, Peoples R China.;[Liang, Jian] South China Normal Univ, Southern Nucl Sci Comp Ctr, Guangdong Hong Kong Joint Lab Quantum Matter, Guangzhou 510006, Guangdong, Peoples R China.
摘要：
The separation of the connected and disconnected sea partons, which were uncovered in the Euclidean path-integral formulation of the hadronic tensor, is accommodated with an extended parametrization of the nonperturbative parton distribution functions in the CT18 global analysis. This is achieved with the help of the distinct small x behaviors of these two sea partons and the constraint from the lattice calculation of the ratio of the strange momentum fraction to that of the u over bar or d over bar in the disconnected insertion. The whole dataset of CT18 is used in this CT18CS fit. The impact of the recent SeaQuest data on the d over bar (x) - u over bar (x) distribution of CT18CS is also discussed. The separate momentum fractions for the valence, the connected sea and disconnected sea of u and d, the strange and the gluon partons are presented at the input scale mu = 1.3 GeV for the first time. They can be compared term-by-term with systematic error controlled lattice calculations.
期刊：
JOURNAL OF PHYSICAL CHEMISTRY A,2022年126(3):406-415 ISSN：1089-5639
通讯作者：
Wang, Cong-Zhi;Shi, Wei-Qun
作者机构：
[Xue-Fei Luan; Jian-Hui Lan; Cong-Zhi Wang; Wang, CZ; Zhi-Fang Chai; Wei-Qun Shi; Shi, WQ; Qun-Yan Wu] Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China.;[Xue-Fei Luan; Liang-Shu Xia] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Zhi-Fang Chai] Chinese Acad Sci, Engn Lab Adv Energy Mat, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China.
通讯机构：
[Wang, CZ; Shi, WQ ] C;Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China.
摘要：
Extraction of uranium from seawater is one of the important ways to solve the shortage of terrestrial uranium resources. Thereinto, the competition between uranyl and vanadium cations is a significant challenge in the commonly used amidoxime-based adsorbents for extracting uranium from seawater. An in-depth understanding of the extraction behaviors of modified amidoxime groups with uranyl and vanadium ions is one of the effective means to design and develop efficient adsorbents for selective uranium sequestration. In this work, we have designed and systematically investigated the alkyl and amino functionalized amidoxime, (Z)-2-amino-N'-hydroxy-N,N-dimethylbenzimidamide (L(1)), and its phenyl and methoxy derivatives ((Z)-3-amino-N'-hydroxy-N,N-dimethyl-2-naphthimidamide (L(2)) and (Z)-2-amino-N'-hydroxy-4-methoxy-N,N-dimethylbenzimidamide (L(3))) by quantum chemistry calculations. In the uranyl complexes, the amidoxime groups prefer to act as η(2)-coordinated ligands as the amidoximes increase, and there exist substantial hydrogen bond interactions, which are different from the vanadium complexes. Various bonding analyses show that the L(1) ligand possesses a stronger binding affinity to UO(2)(2+), and the -C(6)H(5) and -CH(3)O substituent groups seem to have no effect on the improvement of extraction ability. Thermodynamic analysis confirms that the L(1) ligand has a stronger extraction capability to uranyl ion compared to L(2) and L(3). According to the calculations of the vanadium (V) (VO(2)(+) and VO(3+)) complexes with the L(1) ligand, L(1) is more likely to react with [H(2)VO(4)](-) and [HVO(4)](2-) to form VO(2)(+) complexes. Expectantly, thermodynamic analysis displays a higher extraction capacity for uranyl ions than vanadium ions. Therefore, these alkyl and amino functionalized amidoxime ligands demonstrate high selectivity for uranyl over vanadium ions, which is mainly due to the coordination mode changes of these ligands toward vanadium in conjunction with the considerable hydrogen bonds in the uranyl complexes. These results are expected to afford useful clues for the design of efficient adsorbents for uranium extraction from seawater.
作者机构：
[Wang, Xinpeng; Fujita, Toyohisa; Ning, Xiaomei; Wang, Xianran; Wang, Dengpeng; Gao, Feng; Wang, Kaituo] Guangxi Univ, Guangxi Key Lab Proc Nonferrous Met & Featured Ma, MOE Key Lab New Proc Technol Nonferrous Met & Mat, Nanning 530004, Peoples R China.;[Wang, Xinpeng; Fujita, Toyohisa; Ning, Xiaomei; Wang, Xianran; Wang, Dengpeng; Gao, Feng; Wang, Kaituo] Guangxi Univ, Sch Resources Environm & Mat, Nanning 530004, Peoples R China.;[Wei, Yuezhou] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Toyohisa Fujita; Feng Gao] A;Authors to whom correspondence should be addressed.<&wdkj&>Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials, Guangxi University, Nanning 530004, China<&wdkj&>School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
通讯机构：
[Chang-jun Qiu] S;School of Resource Environment and Safety Engineering, College of Mechanical Engineering, School of Nuclear Science and Technology, University of South China, Hengyang 421001, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
The effects of laser parameters on the microstructure and properties of plasma-sprayed yttrium oxide coating on the graphite matrix were investigated. Tensile strength, porosity, roughness, and scratch meter tests were carried out to evaluate the critical load and mechanical properties of the coating after spraying and laser micro-melting. When the porosity and surface roughness of the coating are minimum, the critical load of the coating is 7.85 N higher than that of the spraying surface. After laser micromelting, the crystal phase of Y(2)O(3) coating surface does not change, the crystallinity is improved, and fine grain strengthening occurs. When the laser power density is 75 W/mm(2), the scanning speed is 30 mm/s, and the defocusing distance is 40 mm, the film base bonding performance and wear resistance of the material reach the maximum value. The failure of Y(2)O(3) coating is mainly due to the degradation of mechanical properties such as film base bonding strength, surface porosity, and surface roughness, which leads to the local collapse of the material. The coating after laser micro-melting only presents particle disintegration at the end of the scratch area.
作者：
Hamza, Mohammed F.;Mira, Hamed;Wei, Yuezhou;Aboelenin, Salama M.;Guibal, Eric;...
期刊：
Chemical Engineering Journal,2022年441:135941 ISSN：1385-8947
通讯作者：
Wei, Yuezhou(yzwei@usc.edu.cn)
作者机构：
[Wei, Yuezhou; Hamza, Mohammed F.] Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.;[Mira, Hamed; Hamza, Mohammed F.] Nucl Mat Author, POB 530,El-Maadi, Cairo, Egypt.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.;[Aboelenin, Salama M.] Turabah Univ Coll, Taif Univ, Biol Dept, At Taif, Saudi Arabia.;[Guibal, Eric] IMT Mines Ales, Polymers Compos & Hybrids PCH, Ales, France.
通讯机构：
[Yuezhou Wei] S;[Eric Guibal] P;School of Nuclear Science and Technology, University of South China, Heng Yang 421001, PR China<&wdkj&>School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, PR China<&wdkj&>Polymers Composites and Hybrids (PCH), IMT Mines Ales, Alès, France
关键词：
At pH 2.2 sulfonated chitosan selectively recovers lithium from acidic leachate of mobile phone Li-ion battery (for sustainable valorization of strategic metal);High stability in performances of sorption and desorption for eighteen cycles;Lithium sorption remains highly selective for Li(I) against alkali-earth and heavy metals;The sulfonation of chitosan strongly enhances the recovery of lithium from aqueous solutions;Uptake kinetics are fitted by the pseudo-first-order rate equation and sorption isotherms by the Langmuir dual site equation
作者机构：
[Shen, Jiyu; Zhang, Qinghang; Liu, Min; Lu, Zeyi; Zhang, Renjie; Xia, Yanfang] Univ South China, Coll Nucl Sci & Technol, Hengyang, Peoples R China.;[Hu, Guochen] Kunming Univ Sci & Technol, Fac Met & Energy Engn, Kunming, Yunnan, Peoples R China.;[Chen, Haiwen] Xiamen Univ, Coll Energy, Xiamen, Peoples R China.
通讯机构：
[Yanfang Xia; Min Liu] C;College of Nuclear science and Technology, University of South China, Hengyang, People’s Republic of China<&wdkj&>College of Nuclear science and Technology, University of South China, Hengyang, People’s Republic of China
关键词：
Thermal-induced;Prussian blue analogues;Structural distortion;Charge transfer
通讯机构：
[Zhang-Yong Song] I;Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China<&wdkj&>School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, China
摘要：
In this paper, we investigate the innermost stable circular orbit (ISCO) of spinning particles around a rotating black hole surrounded by the perfect fluid dark matter (PFDM). The motion of spinning particles is derived by Mathisson–Papapetrou–Dixon equation and the ISCO parameters are obtained by the radial effective potential. The effect of PFDM density parameter on the motion of spinning particles is analyzed. The results show that the effect of PFDM is nonlinear, and the radius of ISCO varies nonmonotonically with PFDM density parameter.
摘要：
Activated carbon is widely used in Rn-222 removal. Meanwhile, the regeneration of activated carbon is key to improve its utilization in Rn-222 removal. The goal of this study is to find the most appropriate conditions of the regeneration of activated carbon for the removal of Rn-222 and to provide a reference for the application of microwave-assisted regeneration of saturated activated carbon. In this paper, the self-developed microwave device is used to perform multiple regeneration experiments at different gas flow rates, and the Rn-222 absorption coefficient of activated carbon is determined by dynamic adsorption. The relative standard deviation of 3.4% suggests that the measured dynamic adsorption coefficient is stable, reliable, and well reproducible. When the flow rate is 4 L min(-1), the dynamic adsorption coefficient of Rn-222, generated by the activated carbon after three cycles through open-loop regeneration, reaches the maximum value, around 20.8% higher than the fresh activated carbon. In the closed-loop regeneration mode (6 L min(-1) flow rate), the dynamic adsorption coefficient is 19.1% higher than that of fresh activated carbon. The aperture characterization shows that the micropores are most abundant ranging from 5 to 6 angstrom. Moreover, at 8 and 10 L min(-1), the pore diameter of the activated carbon is in the range of 5 to 6 angstrom, about 20.0% and 30.0% higher than nine cycles. Therefore, three to four cycles times, using closed-loop regeneration at a low gas flow rate (4 L min(-1)) can improve the Rn-222 adsorption and the utilization rate of activated carbon most effectively.
摘要：
The aim of this study is to demonstrate the feasibility of a commercially available Auto-Planning module for the radiation therapy treatment planning for locally advanced nasopharyngeal carcinoma (NPC). 22 patients with locally advanced NPC were included in this study. For each patient, volumetric modulated arc therapy (VMAT) plans were generated both manually by an experienced physicist and automatically by the Auto-Planning module. The dose distribution, dosimetric parameters, monitor units and planning time were compared between automatic plans (APs) and manual plans (MPs). Meanwhile, the overall stage of disease was factored into the evaluation. The target dose coverage of APs was comparable to that of MPs. For the organs at risk (OARs) except spinal cord, the dose parameters of APs were superior to that of MPs. The D(max) and V(50) of brainstem were statistically lower by 1.0Gy and 1.32% respectively, while the D(max) of optic nerves and chiasm were also lower in the APs (p < 0.05). The APs provided a similar or superior quality to MPs in most cases, except for several patients with stage IV disease. The dose differences for most OARs were similar between the two types of plans regardless of stage while the APs provided better brainstem sparing for patients with stage III and improved the sparing of the parotid glands for stage IV patients. The total monitor units and planning time were significantly reduced in the APs. Auto-Planning is feasible for the VMAT treatment planning for locally advanced NPC.
作者机构：
[Huang, Q. H.; Zheng, P. W.; He, L. H.; Li, C. Y.; Gong, X. Y.; Yin, L.; Zhong, Y. J.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Jiang, X. C.; Zheng, P. W.; Li, C. Y.] Univ South China, Sch Resource & Enviroment & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Lu, L. F.; Li, C. Y.] Southwestern Inst Phys, Chengdu 610041, Sichuan, Peoples R China.
通讯机构：
[P.W. Zheng] S;School of Nuclear Science and Technology, University of South China, Hengyang 421001, Hunan Province, People's Republic of China<&wdkj&>School of Resource & Enviroment and Safety Engineering, University of South China, Hengyang 421001, Hunan Province, People's Republic of China
摘要：
ALETHEIA (a liquid hElium time projection cHambEr In dark matter) project is an originally creative dark matter experiment aiming to search for low-mass (100 MeV/c(2)-10 GeV/c(2)) WIMPs. While there have existed more than ten experiments doing research on low-mass WIMPs, the ALETHEIA is supposed to grow up to be a leading project worldwide due to many unique advantages, including but are not limited to extremely low intrinsic backgrounds, easy purification, and strong potential capability of signal/background discrimination. Owing to the project's original creativity, there has existed no direct experience of building such a detector yet; consequently, we have to launch a set of R&D programs from scratch, including the TPB coating process conveyed in this paper. An incident particle that hits a liquid helium detector would generate 80-nm-long scintillation. There are currently no commercially available photon detectors capable of efficiently detecting the scintillation light and a wavelength converter must be used to convert the 80-nm-long scintillator into visible light. Silicon photomultipliers (SiPMs) can then be implemented to detect the 450-nm-wavelength light. The TPB (Tetraphenyl Butadiene, 1, 1,4, 4-tetraphenyl-1, 3-butadiene) is widely used for realizing the conversion. Although in thedark matter experiment using argon pulse-shape discrimination (DEAP), 2.3-mu m-thick TPB is successfully coated on the inner wall of the sphere with a radius of 85 cm, we cannot mimic the whole process in our experiment directly out of the two following reasons: (a) our detector shape is cylindrical, not spherical, and (b) the diameter of the current detector prototype is only 10 cm, while the one of the DEAP detectors is as large as 1.7-meter. Consequently, we must design and build an appropriate coating apparatus suitable for our detector. Owing to the existence of necessary auxiliary parts (such as cables for heating and temperature sensors), on which some vapored TPB molecules would be deposited when the coating is in progress. As a result, a blind spot on the inner wall always exists that cannot be fully coated; the blind spot area will affect the visible light yield of 80-nm-long scintillation. To solve the problem, we split the coating process into two steps: coating the curved surface and one base together in the first step and coating another base in the second step. In this way, the cylindrical detector's whole inner wall (the curved surface and the two bases) will be coated. Another key technology is to design an appropriate source sphere containing TPB powder. There are 20 holes evenly distributed on the surface of the sphere. After the TPB powder is heated andevaporated into the gas, the TPB molecules should move slowly enough to ensure that they scatter from each other long enough within the source before randomly finding a hole to escape. As a result, the TPB molecules come out of the source in an isotropic way then adhere to the inner surfaces of a cylindrical detector (diameter and height are both 10 cm) with nearly the same thickness. The TPB coating thickness on the inner wall is in a range between 1.50 and 3.02 mu m, which corresponds to the thinnest and thickest TPB plate, respectively. The variation mainly comes from the different distances from the coating place to the source, which lies at the center of the PTFE cylinder. The thickness difference will not bother us because the conversion efficiency for 80-nm-long scintillation is almost the same as that for the TPB thickness in a range from 0.7 to 3.7 mu m. In addition to introducing the ALETHEIA project briefly at the beginning, we mainly address several aspects of TPB coating: coating principle, source design, coating process, coating thickness monitoring, and the comparison of thickness among coating plates from three independent methods. The whole process addressed in this paper is expected to provide a valuable reference for other experiments with similar requirements.
通讯机构：
[Guoqiang Zhang; Wenjun Ma] S;State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, School of Physics, Peking University , Beijing 100871, China<&wdkj&>Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800, China
关键词：
光学期刊,光学期刊联盟,光学论文,光电资讯,光电社区,光学人物,光学专家,光学实验室,光学文献,编辑出版,光学权威,光学前沿,光学会议,微信智能应答服务,光学资源库,DOI代理注册,高功率激光,High Power Laser Science and Engineer,光子学研究,Photonics Research,中国光学快报,COL,Chinese Optics Letters,光学学报,中国激光,激光与光电子学进展
摘要：
In this work, the high-energy-density plasmas (HEDP) evolved from joule-class-femtosecond-laser-irradiated nanowire-array (NWA) targets were numerically and experimentally studied. The results of particle-in-cell simulations indicate that ions accelerated in the sheath field around the surfaces of the nanowires are eventually confined in a plasma, contributing most to the high energy densities. The protons emitted from the front surfaces of the NWA targets provide rich information about the interactions that occur. We give the electron and ion energy densities for broad target parameter ranges. The ion energy densities from NWA targets were found to be an order of magnitude higher than those from planar targets, and the volume of the HEDP was several-fold greater. At optimal target parameters, 8% of the laser energy can be converted to confined protons, and this results in ion energy densities at the GJ/cm3 level. In the experiments, the measured energy of the emitted protons reached 4 MeV, and the changes in energy with the NWA’s parameters were found to fit the simulation results well. Experimental measurements of neutrons from 2H(d,n)3He fusion with a yield of (24 ± 18) × 106/J from deuterated polyethylene NWA targets also confirmed these results.
