摘要：
SmFe1_xMnxO3 (x = 0.0, 0.1, 0.3) polycrystalline powder samples were prepared by sol-gel method, and the obtained samples were all orthorhombic structures with Pbnm space group. M & ouml;ssbauer spectroscopy at room temperature confirmed the +3 oxidation state of iron. All samples were fitted by sextet spectra, indicating that the samples are magnetically ordered at room temperature. The zero-field-cooled and field-cooled curves of SmFe0.9Mn0.1O3 sample show a reverse crossover trend at 5 K, and the magnetization is significantly enhanced after reaching the spin-switching transition temperature (T-ssw similar to 285 K). SmFe0.7Mn0.3O3 sample exhibits a second-order spin-reorientation transition in the temperature range of 236-281 K. Rare-earth Sm ions underwent a spin-ordered transition from a paramagnetic state to an antiferromagnetic state at around 8 K. Due to the Dzyaloshinskii-Moriya antisymmetric interaction, the M - H curves of the sample at 5 K and 300 K both exhibit weak ferromagnetism.
作者机构：
[Lin, Wenbin; Yang, Bo] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Lin, Wenbin] Southwest Jiaotong Univ, Sch Phys Sci & Technol, Chengdu 610031, Peoples R China.;[Li, Jie] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Wenbin Lin] S;School of Mathematics and Physics, University of South China, Hengyang, China<&wdkj&>School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, China
通讯机构：
[Yue, CT ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
Poly(vinylphosphonic acid);POSS;Limited swelling capacity;Bath and column modes;Uranium (VI) removal
摘要：
Organophosphorus acid polymers with high hydrophilicity and limited swelling capacity have great application potential in disposal of uranium (VI)-containing wastewater due to its high uranium (VI) adsorption efficiency. In this work, POSS-crosslinked poly(vinylphosphonic acid) polymer is synthesized via copolymerization of octa-vinyloctasilasesquioxane and vinylphosphonic acid for uranium (VI) adsorptive removal from solution. The polymer has a high hydrophilicity and limited swelling capacity. The uranium (VI) adsorptive removal is per-formed in batch mode and the effects of polymer dosage, pH and ionic strength are investigated. The polymer shows high removal efficiency for uranium (VI) from a 120 mg L-1 solution and can achieve the complete uranium (VI) removal at 30 degrees C and pH 4.0 with 0.33 g L-1 polymer. The adsorption process is analyzed by comparison with the adsorption kinetic and isotherm models. Uranium (VI) adsorption on this polymer is found to be more consistent with the pseudo-second-order and Langmuir models, and the maximum adsorption ca-pacity attains 714 mg g- 1. Competitive adsorption between uranium (VI) and other metal ions on polymer is performed to analyse the adsorption selectivity. The polymer attains a 20 L g- 1 uranium (VI) distribution co-efficient, higher than other metal ions (0.1-1.8 L g-1). The polymer can be easily recycled for at least five times with removal efficiency above 99% and the polymer can be well applied for dynamic adsorptive removal of uranium (VI) from uranium-containing solution (5 mg L-1) in a fixed-bed column with removal efficiency above 99%. The excellent uranium (VI) removal performances of this composite polymer highlight its great potential in the disposal of uranium-containing nuclear wastewater.
摘要：
To efficiently separate strontium (Sr) from simulated high level liquid waste (HLLW), a novel acid-resistant inorganic-organic hybrid adsorbent, named as HEMAP/SiO2-P, was prepared by loading 2-hydroxyethyl-2-methyl-2-propenoate phosphate (HEMAP) into styrene-divinylbenzene modified silica (SiO2-P) with vacuum impregnation method. The experimental results showed that the adsorbent exhibited good adsorption selectivity with the SFSr/metal ions over 64.2 in 3 M HNO3 simulated HLLW. In addition, the adsorption of Sr by the adsorbent was in accordance with the pseudo-second-order kinetic model and the Langmuir isotherm model, and the adsorption equilibrium was obtained within 1 min with the saturation adsorption capacity of 61.2 mg/g. The adsorption of Sr was not markedly changed with increasing temperature. Furthermore, the results of adsorption experiments, characterization analysis, extraction experiments and density functional theory (DFT) calculations revealed that two organic ligand molecules were coordinated with one Sr molecule and simultaneously involved two nitrate molecules to maintain the charge balance during the adsorption process.
期刊：
Separation and Purification Technology,2023年327:124977 ISSN：1383-5866
通讯作者：
Wang, XP;Ning, SY
作者机构：
[Wang, Xinpeng; Fujita, Toyohisa; Wang, XP; Xu, Sizhi; Gao, Feng] Guangxi Univ, State Key Lab Featured Met Mat & Life cycle Safety, MOE Key Lab New Proc Technol Nonferrous Met & Mat, Nanning 530004, Peoples R China.;[Wang, Xinpeng; Fujita, Toyohisa; Wang, XP; Xu, Sizhi; Gao, Feng] Guangxi Univ, Sch Resources Environm & Mat, Nanning 530004, Peoples R China.;[Ning, Shunyan; Wei, Yuezhou; Yin, Xiangbiao; Chen, Lifeng] Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, 800 Dong Chuan Rd, Shanghai 200240, Peoples R China.
通讯机构：
[Wang, XP ] G;[Ning, SY ] U;Guangxi Univ, State Key Lab Featured Met Mat & Life cycle Safety, MOE Key Lab New Proc Technol Nonferrous Met & Mat, Nanning 530004, Peoples R China.;Guangxi Univ, Sch Resources Environm & Mat, Nanning 530004, Peoples R China.;Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.
关键词：
Pd;Adsorption;High-level Liquid Waste;In -situ Reduction;Catalytic Formic Acid;Hydrogen production
摘要：
Considering the necessity and challenge in palladium recovery from high-level liquid waste and hydrogen energy development, the first attempt was made to adsorb Pd(II) from simulated high-level liquid waste firstly, then to achieve in situ reduction by a simple method and followed by using it directly for efficient hydrogen production through the catalytic decomposition of formic acid. In this work, a composite of covalent organic framework and SiO2 (Tp-Azo-COF/SiO2) was prepared by wet impregnation method using SiO2 as a carrier. The characteristics of the composite were examined by SEM, EDS, BET, TG, XRD, etc. The results showed that Tp-Azo-COF/SiO2 exhibited regular silicon-based spherical shapes in microscopic form and good heat resistance. In batch experiments, Tp-Azo-COF/SiO2 was demonstrated excellent adsorption and selectivity for Pd(II) at a wide range of HNO3 acidity (1–5 M), and the separation factor was as high as 2653 at 3 M HNO3. Tp-Azo-COF/SiO2 was able to reach a maximum adsorption capacity of 85.40 mg/g at 120 min at 298 K in 3 M HNO3. FT-IR and XPS analysis show that the adsorption mechanism of Pd(II) by the composite occurs mainly on the C-NH of Tp-Azo-COF, and NO3– is also involved in the coordination. In dynamic column experiments, Tp-Azo-COF/SiO2 was demonstrated a nearly complete separation and recovery of Pd(II) with good reusability, and the enrichment coefficients all maintained at about 30. Finally, an efficient and environmentally friendly process was proposed to achieve the in situ reduction of Pd(II)-loaded Tp-Azo-COF/SiO2. Pd-loaded Tp-Azo-COF/SiO2 was demonstrated better decomposition performance than commercial Pd-based catalysts hydrogen production by the catalytic decomposition formic acid.
期刊：
Physics of the Dark Universe,2023年42:101308 ISSN：2212-6864
通讯作者：
Lin, WB
作者机构：
[Li, Jie] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Lin, Wenbin; Yang, Bo; Lin, WB] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Wang, Yu] Univ Rome, Dip Fis, ICRA, Ple Aldo Moro 5, I-00185 Rome, Italy.;[Lin, Wenbin] Southwest Jiaotong Univ, Sch Phys Sci & Technol, Chengdu 610031, Peoples R China.
通讯机构：
[Lin, WB ] U;Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
关键词：
Quark stars;Massive gravity;MIT bag model;Tolman-Oppenheimer-Volkoff equation
摘要：
We investigate the structure of quark stars in de Rham-Gabadadze-Tolley like massive gravity with an anisotropic matter source. The MIT bag model as the equation of state for compact stars is used to numerically solve the modified Tolman-Oppenheimer-Volkoff equation. We analyze the effects of bag constant, anisotropy parameter and massive gravity parameters on the structure of quark stars. The results show that the mass and radius of the quark star depend on these parameters significantly, and the maximum mass can satisfy the observational data for the massive pulsar PSR J0348+0432. Furthermore, we also discuss other properties of quark stars, including dynamical stability, Schwarzschild radius and compactness.& COPY; 2023 Elsevier B.V. All rights reserved.
作者：
Su, Ling-Ling;Wu, Qun-Yan*;Wang, Cong-Zhi;Lan, Jian-Hui;Shi, Wei-Qun
期刊：
INORGANIC CHEMISTRY,2023年 ISSN：0020-1669
通讯作者：
Wu, Qun-Yan;Shi, WQ
作者机构：
[Su, Ling-Ling] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wu, Qun-Yan; Su, Ling-Ling; Shi, Wei-Qun; Wang, Cong-Zhi; Lan, Jian-Hui] Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China.
通讯机构：
[Wu, QY; Shi, WQ ] C;Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China.
摘要：
Excellent "CHON" compatible ligands based on a heterocyclic skeleton for the separation of trivalent actinides [An(III)] from lanthanides [Ln(III)] have been widely explored, the aim being spent nuclear fuel reprocessing. The combination mode of a soft/hard (N/O) donor upon the coordination chemistry of An(III) and Ln(III) should play a vital role with respect to the performance of ligands. As such, in this work, two typical experimentally available phenanthroline-derived tetradentate ligands, CyMe(4)-BTPhen (L(1)) and Et-Tol-DAPhen (L(4)), and two theoretically designed asymmetric tetradentate heterocyclic ligands, L(2) and L(3), with various N/O donors were investigated using scalar relativistic density functional theory. We have evaluated the electronic structures of L(1)-L(4) and their coordination modes, bonding properties, and extraction reactions with Am(III) and Eu(III). We found that the Am/Eu-N interactions play a more important role in the orbital interactions between the ligand and Am(III)/Eu(III) ions. Compared with those of L(1), the coordinated O atoms of L(2) and L(4) weaken the metal-N bonds. The Am(III)/Eu(III) selectivity follows the order L(1) > L(2) > L(4) based on the change in Gibbs free energy, reflecting the fact that the Am(III)/Eu(III) selectivity of the ligand is affected by the number of coordinated N atoms. In addition, L(3) displays the strongest binding ability for Am(III)/Eu(III) ions and the smallest Am(III)/Eu(III) selectivity among the four ligands, due to its structural preorganization. This work clarifies the influence of the number of coordinated N and O atoms of ligands on Am(III)/Eu(III) selectivity, which provides valuable fundamental information for the design of efficient ligands with N and O donors for An(III)/Ln(III) separation.
作者：
Hamza, Mohammed F.;Guibal, Eric;Wei, Yuezhou;Fouda, Amr;Althumayri, Khalid;...
期刊：
Journal of Water Process Engineering,2023年54:103928 ISSN：2214-7144
通讯作者：
Wei, YZ;Guibal, E
作者机构：
[Wei, Yuezhou; Hamza, Mohammed F.] Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.;[Abu Khoziem, Hanaa A.; Hamza, Mohammed F.] Nucl Mat Author, POB 530, Cairo, Egypt.;[Guibal, Eric; Guibal, E] IMT Mines Ales, Polymers Compos & Hybrids PCH, Ales, France.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.;[Fouda, Amr] Al Azhar Univ, Fac Sci, Bot & Microbiol Dept, Cairo 11884, Egypt.
通讯机构：
[Wei, YZ ] U;[Guibal, E ] I;Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.;IMT Mines Ales, Polymers Compos & Hybrids PCH, Ales, France.;Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.
关键词：
Cadmium(II) sorption;Uptake kinetics;Sorbent recycling;Sulfur derivative of gellan gum;TBP-functionalization;Selective separation
摘要：
Two sorbents are successfully synthesized based on the chemical modification of gellan gum (GG). First, thiosemicarbazide is grafted onto GG to produce GEG-C. In a second step, GEG-C is functionalized with a derivative of tributyl phosphate (dTBP, giving GEG-P sorbent). The sorption properties are compared for recovery of Cd(II) from aqueous solutions. GEG-C is expected to bind Cd(II) through carboxylic, amine, and thiocarbonyl groups, while phosphate groups in GEG-P contribute to increase metal sorption. The chemical modification improves not only the uptake kinetics (equilibrium time & AP;30 min, vs. 45 min) but also the sorption capacities (& AP;2.79 vs. 1.60 mmol Cd g-1), at optimum pH (i.e., pH 5). The functionalization also improves (a) the sorbent stability (weaker reduction of the loss in sorption efficiency after five cycles of reuse compared with GEG-C) and (b) the sorption selectivity in the presence of competitor ions (from equimolar multicomponent solutions), especially at pH 4. Different sorption mechanisms may be involved depending on the pH (deprotonation of reactive groups) including chelation (onto deprotonated amine and phosphonate groups) and ion exchange (protonated groups with metal cations). Cadmium sorption is reversed by contact with 0.3 M HCl solution. The functionalization (GEG-P) strongly increases the selectivity coefficient for Cd(II) against major elements in mining effluent, especially at pH higher than 5. These results confirm the interest of multifunctionality in the development of new sorbents based on renewable resources (such as gellan gum).
摘要：
Wastewater disposal from beryllium production has become a significant problem in the industry. Therefore, this paper designed porous calcium carbonate biochar (CC-LBC) using Na2CO3 and CaCl2 to modify the biochar innovatively, after which we understudied the Be(II) adsorption effect of CC-LBC at different concentrations. The results from Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), and other characterization analyses showed that when CC-LBC particles were immersed in the Be(II) waste liquid, several O elements accumulated because of its loose and porous structure, generating more beryllium precipitates on the surface of the adsorbent. According to kinetic data fitting, in-vestigations also revealed that both physical and chemical reactions controlled CC-LBC/Be(II) adsorption pro-cess, indicating that the CC-LBC/Be(II) adsorption system is suitable for the intraparticle diffusion model. Furthermore, when the beryllium on activated carbon was desorbed by 10% NaOH, the desorption effect was above 80%, and the saturation adsorption capacity of CC-LBC for Be(II) was up to 55 mg/g. However, when the initial concentration of Be(II) was equal to 0.5-1 mg/L, the concentration of beryllium after treatment was lower than 10 & mu;g/L, confirming that CC-LBC had a better selective adsorption performance for beryllium in the binary system.
摘要：
In the present work, based on Wentzel-Kramers-Brillouin theory, we systematically study the cluster
radioactivity half-lives of 22 nuclei ranging from 221Fr to 242Cm by using a phenomenological model, which considers
the screened electrostatic effect of Coulomb potential. In this model, there are two adjustable parameters i.e. the
parameter t and g, which are related to the screened electrostatic barrier and the strength of spectroscopic factor,
respectively. The calculated results indicate this model can well reproduce the experimental data while the corre sponding root-mean-square (rms) deviation is 0.660. In addition, we extend this model to predict the half-lives of
possible cluster radioactive candidates whose cluster radioactivity are energetically allowed or observed but not
yet quantified in the evaluated nuclear properties table NUBASE2020. The predicted results are consistent with
the ones obtained by using other theoretical models and/or empirical formulae including the universal decay law
(UDL) proposed by Qi et al. [Phys. Rev. C 80, 044326 (2009)], a semi-empirical model for both α decay and cluster
radioactivity proposed by Santhosh et al. [J. Phys. G 35, 085102 (2008)] and a unified formula of half-lives for α
decay and cluster radioactivity proposed by Ni et al. [Phys. Rev. C 78, 044310 (2008)].
摘要：
In the present work, the cluster radioactivity preformation probability Pc in the scheme of NpNn for the effective number of the valence particles (holes) in trans-lead nuclei has been systematically investigated. This quantity has been explored in the simplified parametrization of NpNn as well as the multiplication NpNnI of this product with the isospin asymmetry I. The calculations for Pc are both performed in microscopic and model-dependent way. Within the microscopic approach, based on our previous work [Chin. Phys. C 47, 014101 (2023)], Pc is calculated in cluster formation model combined with the exponential relationship of Pc to the & alpha; decay preformation probability P & alpha; when the mass number of the emitted cluster Ac 28. While Ac 28, Pc is obtained through the charge-number dependence of Pc on the decay products proposed by Ren et al. [Phys. Rev. C 70, 034304 (2004)]. In the model-dependent approach, Pc is extracted through the ratios from calculated cluster radioactivity half-lives in the framework of unified fission model proposed by Dong et al. [Eur. Phys. J. A 41, 197 (2009)] to experimental ones. Both of the results show Pc in logarithmic form are linear to NpNn as well as NpNnI. For comparison, the parent-mass-number dependence analytical formula as well as the model proposed by Wei and Zhang [Phys. Rev. C 96, 021601(R) (2017)] are also used. Furthermore, the preformation mechanic for cluster radioactivity has also been discussed.
期刊：
EUROPEAN PHYSICAL JOURNAL A,2023年59(11):1-8 ISSN：1434-6001
通讯作者：
Li, XH
作者机构：
[Luo, Song; Li, Xiao-Hua; Qi, Lin-Jing; Zhang, Dong-Meng; Li, XH] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua; Li, XH] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Equ, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua; Li, XH] Univ South China, Natl Exemplary Base Int Sci & Technol, Collaborat Nucl Energy & Nucl Safety, Hengyang 421001, Peoples R China.;[He, Biao] Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China.;[Chu, Peng-Cheng] Qingdao Univ Technol, Res Ctr Theoret Phys, Sci Sch, Qingdao 266033, Peoples R China.
通讯机构：
[Li, XH ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Equ, Hengyang 421001, Peoples R China.;Univ South China, Natl Exemplary Base Int Sci & Technol, Collaborat Nucl Energy & Nucl Safety, Hengyang 421001, Peoples R China.
摘要：
In the present work, based on Wentzel-Kramers-Brillouin (WKB) theory, considering the cluster preformation probability (
$$P_{c}$$
) in statistical physical way (Eur Phys J A 41:197, 2009), we systematically investigate the cluster radioactivity half-lives of 22 trans-lead nuclei ranging from
$$^{221}$$
Fr to
$$^{242}$$
Cm. For comparison, a universal decay law (UDL) proposed by Qi et al. (Phys Rev C 80:044326, 2009), a model-independent formula for cluster radioactivity half-lives proposed by Balasubramaniam et al. (Phys Rev C 70:017301, 2004) and a general law for the emission of charged particles and exotic cluter radioactivity proposed by Sahu et al. (Nucl Phys A 908:17, 2013) are also used. The calculated results in our work, UDL, Balasubramaniam’s formula as well as Sahu’ s formula are basically consistent and can well reproduce the experimental data. In addition, we extend this model to predict the half-lives for 51 nuclei, whose cluster radioactivity is energetically allowed or observed but yet not quantified in NUBASE2020.
作者：
Hamza, Mohammed F.;Guibal, Eric;Althumayri, Khalid;Wei, Yuezhou;Eid, Ahmed M.;...
期刊：
Chemical Engineering Journal,2023年454:140155 ISSN：1385-8947
通讯作者：
Guibal, Eric(eric.guibal@mines-ales.fr)
作者机构：
[Wei, Yuezhou; Hamza, Mohammed F.] Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.;[Hamza, Mohammed F.] Nucl Mat Author, POB 530, Cairo, Egypt.;[Guibal, Eric] IMT Mines Ales, Polymers Compos & Hybrids PCH, Ales, France.;[Althumayri, Khalid] Taibah Univ, Coll Sci, Dept Chem, Al Madinah Al Munawarah 30002, Saudi Arabia.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.
通讯机构：
[Eric Guibal] P;[Yuezhou Wei] S;Polymers Composites and Hybrids (PCH), IMT Mines Ales, Alès, France<&wdkj&>School of Nuclear Science and Technology, University of South China, Heng Yang 421001, China<&wdkj&>School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
关键词：
Easy synthesis of a highly efficient sorbent for cesium through ready condensation of acetamido-aminomethanesulfonic acid (via formaldehyde reaction);Fast cesium uptake onto microparticles (fitted by the pseudo-first order rate equation);Good sorption performance in seawater;Limited toxicity against Gram+ and Gram- bacteria and pathogenic yeast, reduced cytotoxicity against normal cells (but inhibiting cancerous cells);Remarkable desorption and sorbent recycling using 0.3 M HNO3 solution;Selectivity against alkali and alkali-earth metal ions
摘要：
A new sorbent (ACES-F micro-particles) is readily synthesized by the one-pot reaction of N-(2-acetamido)-2-aminoethanesulfonic acid with formaldehyde (poly-condensation reaction). The mesoporous sorbent is charac-terized by BET analysis (SBET: approximate to 6 m2 g-1), SEM-EDX (N: approximate to 7-8 % and S: 5 %), FTIR spectroscopy (identification of amine, sulfonic groups and their interactions with metal ions), TGA, elemental analysis, and titration (pHPZC: approximate to 5.7). The study of pH effect on Cs(I) shows an optimum close to 8 (with intermediary optimum at pH 4, associated with different reactive groups). The micron-size sorbent shows fast sorption (equilibrium in 60 min) and the pseudo-first order rate equation fits the kinetic profile. The sorption isotherm reaches up to 1.99 mmol Cs g-1; the Langmuir equation models isotherm profiles. The sorption decreases with increasing temperature; sorption is exothermic. Cesium uptake is affected by the presence of NaCl; however, even in large excess of salt (i. e., 4 M) sorption remains relatively high (loss <60 %). Selectivity is confirmed by the remarkable preference of the sorbent for Cs against alkali and other competitor metal ions, especially at pHeq approximate to 7. Metal desorption is highly effective using 0.3 M HNO3 solutions: complete desorption occurs in 30 min. The sorbent can be recycled for at least five cycles (losses <3 %). The interest of ACES-F for cesium recovery from seawater is confirmed by the study of Cs(I) sorption (and other major elements) from Vietnam and Egypt samples. The safety of the sorbent for aqueous bodies is evaluated by the cytotoxicity of the sorbent (limited against normal cells but highly reactive for cancerous cells); while the sorbent shows interesting antimicrobial properties for Gram+, Gram-and path-ogenic yeast.
作者机构：
[Yan, Mengshi; Yan, MS] Peking Univ, Dept Phys, Beijing 100871, Peoples R China.;[Yan, Mengshi; Yan, MS] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China.;[Hou, Tie-Jiun] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Nadolsky, Pavel] Southern Methodist Univ, Dept Phys, Dallas, TX 75275 USA.;[Nadolsky, Pavel] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA.
通讯机构：
[Yan, MS ] P;Peking Univ, Dept Phys, Beijing 100871, Peoples R China.;Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China.
摘要：
In this paper, we present a CT18 PDF global QCD analysis at leading order in QCD perturbation theory. The CT18 LO PDFs is obtained within the general CT18 framework, along with two additional procedures imposed to improve the quality of the fit. We take the W -boson charge asymmetry and inclusive single-top production at LHC as examples to illustrate implications of the CT18 LO PDFs.
期刊：
Journal of the Korean Physical Society,2023年83(1):25-30 ISSN：0374-4884
通讯作者：
Muhammad Abdul Wasaye<&wdkj&>Tao Yu
作者机构：
[Wasaye, Muhammad Abdul; Ni, Zining; Yu, Tao] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Muhammad Abdul Wasaye; Tao Yu] S;School of Nuclear Science and Technology, University of South China, Hengyang, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang, China
关键词：
Multiple scattering;Random walk;Differential cross-section;Angular distribution;ELSEPA;Monte Carlo
摘要：
A new method based on random walk theory to model multiple elastic scattering of electrons is presented which gives the efficient convergence of scattering series. This method modelled the multiple scattering as a series of random walks on a unit sphere, with each scattering event equivalent to one step in the random walk sequence. The step size of the random walk is characterised by the scattering angle which is determined by the scattering differential cross-section. Dirac partial wave program ELSEPA has been used to calculate the differential cross-sections of electrons and positrons by neutral atoms. The position distribution of a point on this unit sphere after “n” steps of random walk yields the angular distribution of multiple scattering. The main advantage of this method is the faster convergence of the scattering series for small step size, which is the most computationally demanding scenario in Monte Carlo multiple scattering simulations in the radiation transport code. Equivalence to Goudsmit–Saunderson’s theory of multiple scattering is also demonstrated and the angular distributions obtained from both the random walk method and Goudsmit–Saunderson’s theory are compared. The convergence of the scattering series is checked by comparing the Legendre polynomial expansion coefficients obtained through the random walk method and Goudsmit–Saunderson’s theory. Comparisons showed that the scattering series converges very fast for smaller path lengths (< 50
$$\times $$
mean free paths).
作者机构：
[Wang, Xinpeng; Lin, Zheyang; Chen, Yuliang; Fu, Hao; Ma, Guangcan] Guangxi Univ, Sch Resources Environm & Mat, 100 Daxue East Rd, Nanning 530004, Peoples R China.;[Yin, Xiangbiao] Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.;[Fu, Hao] Guangxi Univ, Sch Chem & Chem Engn, Nanning 530004, Peoples R China.;[Chen, Fangqiang; Wang, Qingsong] MEE, Nucl & Radiat Safety Ctr, 9 East Zhixing Rd, Beijing 102400, Peoples R China.
通讯机构：
[Fangqiang Chen; Xinpeng Wang] A;Authors to whom correspondence should be addressed.<&wdkj&>School of Resources, Environment and Materials, Guangxi University, 100 Daxue East Road, Nanning 530004, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>Nuclear and Radiation Safety Center, MEE, 9 East Zhixing Road, Beijing 102400, China
摘要：
Strontium, the main component of radioactive nuclear wastewater, is characterized by a high fission yield and an extended half-life. It is easily absorbed by the human body, thus greatly threatening the environment and the human body. In this study, a mesoporous composite phase sodium superionic conductor (NVP@NMP) was synthesized by the droplet template method, and the rapid capture of Sr2+ from wastewater was achieved by constructing a nano-heterogeneous interface to increase the ion diffusion rate. NVP@NMP showed efficient and rapid removal of strontium ions in adsorption kinetics, isothermal adsorption, solution pH, and interfering ions concentration tests, especially using the equilibrium time of 2 min for strontium absorption by NVP@NMP and a maximum theoretical adsorption capacity of 361.36 mg/g. The adsorption process was spontaneous, endothermic, and feasible. At higher concentrations of other competing ions (Na, K, Ca, Mg, and Cs), the adsorbent exhibited higher selectivity towards Sr2+.TEM, XPS, and XRD analyses revealed that ion exchange was the main mechanism for the NVP@NMP ultrafast adsorption of Sr2+. In this research, we investigated the feasibility of ultrafast strontium capture by sodium superionic conductor structured phosphates and explained the ultrafast strontium adsorption mechanism of NASICON materials through XPS.
作者：
Biao, Zhang;Jinjia, Cao;Shuang, Lin;Yingming, Song
期刊：
Journal of Instrumentation,2023年18(1):P01017 ISSN：1748-0221
作者机构：
[Jinjia, Cao; Biao, Zhang; Yingming, Song] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Shuang, Lin] China Nucl Power Engn Co LTD, Instrument Control Design Inst Beijing Nucl Engn R, Beijing 100142, Peoples R China.
关键词：
Detector modelling and simulations I (interaction of radiation with matter;interaction of photons with matter;interaction of hadrons with matter;etc);Interaction of radiation with matter;Scintillators;scintillation and light emission processes (solid;gas and liquid scintillators)
摘要：
CLYC (Ce) crystal is a new type of inorganic scintillator with excellent performance, which can realize neutron and gamma dual mode measurement. CLYC (Ce) detector is widely used in national defense, homeland security, nuclear imaging, environmental monitoring, nuclear medicine and other fields. The detection efficiency of the detector is an important index in the design and development of the detector. The detection model of CLYC (Ce) detector is established by using Geant4 program based on Monte Carlo method, and the factors affecting the detection efficiency of detector are studied. The results show that: the detection efficiency is related to the shape and size of crystal section. The detection efficiency of rectangular section is lower than that of circular and square section, and the larger the crystal radial size and length, the higher the detection efficiency. The detection efficiency of CLYC (Ce) detector is related to the energy of rays: the higher the energy of neutrons and gamma rays are, the lower the detection efficiency is. It indicates that the crystal responds better to thermal neutrons and low-energy gamma rays. At the same time, if the radiation source is emanative, the smaller the distance between the radiation source and the detector, the higher the detection efficiency of the scintillator.
作者：
Ye, Zhenxiong;Zhang, Huidi;Chen, Xujie;Chen, Lifeng;Thummavichai, Kunyapat;...
期刊：
Journal of Cleaner Production,2023年423 ISSN：0959-6526
通讯作者：
Wang, XP
作者机构：
[Ye, Zhenxiong] Guangxi Univ, Coll Chem & Chem Engn, 100 Daxue East Rd, Nanning 530004, Peoples R China.;[Ye, Zhenxiong; Wang, Xinpeng; Fujita, Toyohisa; Wang, XP; Wei, Yuezhou; Chen, Xujie; Zhang, Huidi] Guangxi Univ, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life Cycle Safety, 100 Daxue East Rd, Nanning 530004, Peoples R China.;[Wei, Yuezhou; Chen, Lifeng] Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.;[Thummavichai, Kunyapat] Northumbria Univ, Fac Engn & Environm, Newcastle Upon Tyne NE1 8ST, England.
通讯机构：
[Wang, XP ] G;Guangxi Univ, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life Cycle Safety, 100 Daxue East Rd, Nanning 530004, Peoples R China.
摘要：
Palladium is versatile in many industrial applications due to its distinct physicochemical properties. Due to the scarcity of natural resources and the growing market demand, palladium recovery from wastes such as spent catalysts is receiving increasing attention. Here, a silica-supported thiourea resin (SiPS-TU) was prepared and applied to separate Pd(II) from spent catalysts. The SiPS-TU was fabricated through in situ polymerization and post modification method using amorphous macroporous silica as the matrix. Experimental results suggested that the optimal acidity for the adsorption process was 0.1 M under selected range, and the uptake of SiPS-TU was affected by H+ and Cl-. The adsorbent showed rapid sorption kinetics with an equilibrium attained in 30 min, while more than 3 h was required for the commercial D840 resin. Column tests showed that SiPS-TU had excellent dynamic separation property for Pd(II) in continuous process. Around 215 bed volumes (430 mL) of Pd (II) solution could be effective treated by the SiPS-TU bed before breakthrough at 4 mL/min, while D840 resin bed was less effective under equivalent conditions (20 mL). In view of its satisfactory adsorption performances, palladium was successfully separated from the catalyst leaching solution by SiPS-TU. XPS spectra and DFT calculations indicated that the adsorption mechanism of SiPS-TU for Pd(II) mainly involved anion exchange and coordination. In conclusion, this study provides a feasible material for palladium recovery from practical leachate.
