作者机构：
[Mohammed I. Alghonaim] Department of Biology, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia;Authors to whom correspondence should be addressed.;[Ahmed M. Alemam; Ahmed M. Eid] Botany and Microbiology Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt;College of Science and Humanities—Huraymila, Imam Mohammed Ibn Saud Islamic University (IMSIU), Riyadh 11432, Saudi Arabia;[Mohamed A. Awad] Department of Zoology and Entomology, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt
通讯机构：
[Khalid S. Alshallash; Amr Fouda] A;Authors to whom correspondence should be addressed.<&wdkj&>Botany and Microbiology Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>College of Science and Humanities—Huraymila, Imam Mohammed Ibn Saud Islamic University (IMSIU), Riyadh 11432, Saudi Arabia
摘要：
An aqueous extract of Punica granatum peel was used as a biocatalyst for magnesium oxide nanoparticle (MgO-NP) synthesis, which was characterized via UV-Vis spectroscopy, TEM, EDX, FT-IR, XRD, DLS, and zeta potential. Data showed the efficacy of the plant aqueous extract in forming spherical, crystalline-nature, well-arranged MgO-NPs with sizes in the range of 10–45 nm with average sizes of 24.82 ± 8.85 nm. Moreover, EDX analysis revealed that the highest weight and atomic percentages were recorded for Mg and O ions. The green synthesized MgO-NPs showed antimicrobial activity against Bacillus subtilis, Staphylococcus aureus, E. coli, Pseudomonas aeruginosa, and Candida albicans in a concentration-dependent manner with clear zones in the range of 8.7 ± 0.6 to 19.7 ± 0.5 mm with various concentrations. Also, the MIC value was varied to be 25 µg mL−1 for Gram-negative bacteria, B. subtilis, and C. albicans and 50 µg mL−1 for S. aureus. Moreover, MgO-NPs showed high activity against the 3rd-instar larvae of Culex quinquefasciatus. The mortality percentages were concentration- and time-dependent. Data analysis showed that the highest mortality was 88.3 ± 3.2%, attained at a concentration of 100 µg mL−1 after 72 h. Also, all originated pupae were malformed and did not hatch to adults, with mortality percentages of 100% at all concentrations. Overall, the P. granatum-mediated MgO-NPs showed promising activity in inhibiting the growth of pathogenic microbes and the hatching of C. quinquefasciatus larvae to adults.
摘要：
In response to the lack of plasma bag-breaking equipment and time-consuming manual recovery of plasma in China, this study focuses on the distal end cutting of a plasma bag residual-input tube and designs a machine-vision-based plasma bag residual-input tube cutting system. The system comprises a plasma bag rotation device, a bottom disc, an image acquisition device, a cutting device, and a device control system. The image acquisition device captures images of the rotating plasma bag and calculates the Euclidean distance from the end of the plasma bag input-tube distal end to the outer edge of the bottom support plate and the distance from the input-tube distal end to the centerline of the plasma bag. Two distinct value acquisition algorithms are designed for the two types of input tubes. The screw slide moves accordingly. When the plasma bag is above the cutting part, the cutting part cuts the end of the residual-input tube of the plasma bag. The prototype performance tests reveal that the cutting error is within 10% of the end of the plasma bag input tube distal end, the cutting success rate is 100%, and the processing time for each bag is 2.5 s, which meets the time requirements of the plasma bag breaker.
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.
摘要：
In this study, based on Wentzel-Kramers-Brillouin theory, we systematically investigate the cluster radioactivity half-lives of 22 nuclei ranging from to using a phenomenological model that considers the Fr-221 Cm-242 screened electrostatic effect of the Coulomb potential. In this model, there are two adjustable parameters, t and g, which are related to the screened electrostatic barrier and the strength of the spectroscopic factor, respectively. The calculated results indicate that this model can effectively reproduce the experimental data, with a corresponding root mean-square deviation of 0.660. In addition, we extend this model to predict the half-lives of possible cluster radioactive candidates whose cluster radioactivities are energetically allowed or observed but not yet quantified in the evaluated nuclear properties table NUBASE2020. The predicted results are consistent with those obtained using other theoretical models and/or empirical formulas, including the universal decay law proposed by Qi et al. [Phys. Rev. C 80, 044326 (2009)], a semi-empirical model for both a decay and cluster radioactivity proposed by Santhosh et al. [J. Phys. G 35, 085102 (2008)], and a unified formula for the half-lives of a decay and cluster radioactivity proposed by Ni et al. [Phys. Rev. C 78, 044310 (2008)].
期刊：
Journal of Instrumentation,2023年18(4):P04006 ISSN：1748-0221
通讯作者：
Tang, Q;Zhang, YP
作者机构：
[Li, Chi; Tang, Quan; Liu, Yu; Xu, Zhongfang; Guan, Tingyu; Tang, Q] Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.;[Liu, Jincang; Zhang, Peng; Yang, Changgen; Zhang, YP; Zhang, Yongpeng; Guo, Cong] Chinese Acad Sci, Inst High Energy Phys, Expt Phys Div, Beijing, Peoples R China.;[Liu, Jincang; Zhang, Peng; Yang, Changgen; Zhang, YP; Zhang, Yongpeng; Guo, Cong] Univ Chinese Acad Sci, Sch Phys, Beijing, Peoples R China.;[Liu, Jincang; Zhang, Peng; Yang, Changgen; Zhang, YP; Zhang, Yongpeng; Guo, Cong] State Key Lab Particle Detect & Elect, Beijing, Peoples R China.
通讯机构：
[Zhang, YP ] C;[Tang, Q ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.;Chinese Acad Sci, Inst High Energy Phys, Expt Phys Div, Beijing, Peoples R China.;Univ Chinese Acad Sci, Sch Phys, Beijing, Peoples R China.
关键词：
Photon detectors for UV;visible and IR photons (solid-state) (PIN diodes;APDs;Si-PMTs;G-APDs;CCDs;EBCCDs;EMCCDs;CMOS imagers;etc);Very low-energy charged particle detectors
摘要：
Radon and its daughters are one of the most important background sources for low -background liquid scintillator (LS) detectors. The study of the diffusion behavior of radon in the LS contributes to the analysis of the related background caused by radon. Methodologies and devices for measuring radon's diffusion coefficient and solubility in materials are developed and described. The radon diffusion coefficient in the LS was measured for the first time and the solubility coefficient was also obtained. In addition, the radon diffusion coefficient in the polyolefine film which is consistent with data in the literature was measured to verify the reliability of the diffusion device.
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：
[Contreras, Miguel Angel Martin] Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.;[Vega, Alfredo] 28 Changsheng West Rd, Hengyang, Hunan, Peoples R China.;[Vega, Alfredo] Univ Valparaiso, Inst Fis & Astron, A Gran Bretana 1111, Valparaiso, Chile.
通讯机构：
[Contreras, MAM ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.
摘要：
In the context of bottom-up AdS/QCD models, we discuss how the configurational entropy can describe heavy non-qq over bar states. Using the nonquadratic softwall model, introduced to describe nonlinear Regge trajectories, we parametrize different multiquark and exotic meson structures to describe Z,, psi, and Zb states as non-qq over bar hadrons in terms of stability. We found that Z, is better described as a hybrid meson with one gluon tube, psi as hadrocharmonium, and Zb as hadronic molecule.
作者机构：
[Liu, Guan-Nan; Li, Xin-Xia; Li, XX] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Liu, Hong-Bo] Hengyang Normal Univ, Sch Phys & Elect Engn, Hengyang 421001, Peoples R China.;[Sun, Ai-Ping; Sun, AP] Southwestern Inst Phys, Chengdu 610041, Peoples R China.
通讯机构：
[Sun, AP ] S;[Li, XX ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Southwestern Inst Phys, Chengdu 610041, Peoples R China.
关键词：
tokamaks;helicon wave;lower hybrid wave;synergy current drive
摘要：
Non -inductive current drive plays a crucial role in tokamak, especially for its steady state operations. Recently, the helicon wave (HW) has been regarded as a promising tool for driving off -axis plasma current in reactor -grade machine. The lower -hybrid wave (LHW) is the most effective radio -frequency current drive method, however, it has the drawback, which is limited by the conditions of wave accessibility in the high parameter tokamak, making the wave power usually damped at the plasma edge. HW can spiral towards the plasma centre directly under a high electron density. To obtain a long pulse steady state operation of reactor tokamak, the complementarity of HW and LHW in the aspect of driven current distribution in the high parameter tokamak is considered. The synergy current drive of the HW and the LHW is studied numerically in the steady-state scenario of HL -2M. According to the fast wave dispersion relation of plasma, the HW parameters, including its wave frequency and launched parallel refractive index, are obtained firstly. Results of GENRAY code simulation show that a single pass wave power absorption of the HW can be obtained generally through the electron Landau damping and transit time magnetic pumping effects. On the other hand, the LHW parameters are adopted from the equipped system on the machine. Results of single pass wave absorption are also obtained in the case of LHW. And then, the synergy effects of HW and LHW are studied numerically based on the GENRAY/CQL3D models. The cooperation of these two waves results in a broad plasma current distribution along the radial direction ( = 0.2-0.9) in the machine. Taking the electron distribution functions of these waves into account, it is clear that the electrons are accelerated by the HW in the parallel magnetic field direction, resulting in more electrons entering the region of LHW resonance area. As the consequence, a net plasma current appears. Furthermore, a fine-grained parametric scan is performed by changing the launched parallel refractive index of HW, and the results indicate that positive synergy effects can be generally observed once the related wave current drive profiles are overlapped. Finally, the synergy factor is shown to be proportional to this overlap and reaches its maximum value of 1.18 in HL -2M.
摘要：
MgxNi1-xFe2O4 (x = 0, 0.25, 0.5, 0.75, 1) spinel ferrite material was analyzed to determine its magnetic properties and structure. X-ray diffraction (XRD), Mossbauer spectroscopy, and vibrating sample magnetometer (VSM) characterization were performed on the samples prepared using the sol-gel method. The results from XRD confirmed the existence of the single-phase cubic spinel structures Fd (3) over barm, as well as the evolution of the crystalline size (D), the lattice parameter (a) and cell volume in compounds. The Mossbauer spectra showed the distribution of cations and changes in the magnetic properties of the sample. VSM measurement revealed that the samples were room-temperature ferromagnetic. Moreover, the saturation magnetization (M-s) of the samples changed with the Mg2+ ion content x, and a maximum occured at x = 0.5. Doping with Mg2+ ions increased the transfer of Ni2+ ions to tetrahedral sites, thus increasing the magnetic moment difference between tetrahedral (A) and octahedral (B) sites. Specifically, doping NiFe2O4 with Mg2+ ions can enhance its magnetic properties and enhance its saturation magnetization.
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：
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.
通讯机构：
[Wen Luo; Weimin Zhou] S;School of Nuclear Science and Technology, University of South China, 421001 Hengyang, People's Republic of China<&wdkj&>Science and Technology on Plasma Physics Laboratory, Laser Fusion Research Center, China Academy of Engineering Physics, 621900 Mianyang, People's Republic of China
关键词：
laser plasma;high-energy electron beam;photonuclear reaction;medical isotopes
摘要：
Radioisotopes are indispensable agents in medical diagnosis and treatment, among which copper-62, 64 (Cu-62,Cu-64) and gallium-68 (Ga-68) are medical isotopes widely used in positron emission tomography (PET) imaging. Experiments that generate these radioisotopes via laser-induced photonuclear reactions were performed on the XingGuangIII laser facility of the Laser Fusion Research Center in Mianyang. High-charge (Q(e) similar to 40 nC) MeV electron (e(-)) beams were generated with 100 terawatts, picosecond laser pulses. The e(-) beams were then impinged on a metal stack composed of Ta foil and activation plates (natural Cu and Ga2O3), producing high-energy bremsstrahlung x-rays and medical isotopes Cu-62,Cu-64 and Ga-68, respectively. The characteristic emissions of the produced Cu-62,Cu-64 and Ga-68 were detected off-line , and the production yields of Cu-62,Cu-64 and Ga-68 were obtained to be of the order of 10(6) per laser shot. For electrons with energy higher than 8 MeV, the dependence of isotope production efficiency (per e(-)) on electron temperature (T-e) is investigated through Geant4 simulations. It is found that the production efficiency increases with the T-e. At T-e similar to 10 MeV, the values are 10(-4) for Cu-62 and 2 x 10(-5) for Ga-68, respectively. The prospect of producing the medical isotopes Cu-62,Cu-64 and Ga-68 are further evaluated using a table-top femtosecond laser system of high repetition. With a repetition rate of 100 Hz, their activity is expected to reach 0.2 GBq for Cu-62, 0.1 GBq for Cu-64 and 0.05 GBq for Ga-68, respectively. Such activity would meet the required dose for clinical PET imaging, indicating the great potential to produce medical isotopes with an all-optical, high-repetition laser system.
作者：
Nie, Pei;Yang, Guangjie;Wang, Yanmei;Xu, Yuchao;Yan, Lei;...
期刊：
European Radiology,2023年33(12):8858-8868 ISSN：0938-7994
通讯作者：
Wang, X.;Wang, Z.
作者机构：
[Nie, Pei] Department of Radiology, the Affiliated Hospital of Qingdao University, Qingdao, Shandong, China;[Yan, Lei; Yang, Guangjie] Department of Nuclear Medicine, the Affiliated Hospital of Qingdao University, No. 59, Haier Road, Qingdao, 266061, Shandong, China;[Wang, Yanmei; Duan, Shaofeng] GE Healthcare, Shanghai, China;[Xu, Yuchao] School of Nuclear Science and Technology, University of South China, Hengyang, Hunan, China;[Zhang, Mingxin] Department of Urology, the Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
通讯机构：
[Wang, Z.; Wang, X.] D;Department of Radiology, No. 324 Jingwu Road, Shandong, China;Department of Nuclear Medicine, No. 59, Haier Road, Shandong, China
作者机构：
[Luo, W.; Liu, L.; Li, X. X.; Hu, B. L.; Luo, W; Liu, L; Sun, X. Y.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Han, L. H.; Liu, L.; Liu, L] Univ South China, Sch Mech Engn, Hengyang 421000, Peoples R China.
通讯机构：
[Luo, W; Liu, L ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Univ South China, Sch Mech Engn, Hengyang 421000, Peoples R China.
摘要：
The management of nuclear wastes has long been a problem that hinders the sustainable and clean utilization of nuclear energy since the advent of nuclear power. These nuclear wastes include minor actinides (MAs: (237)Np, (241)Am, (243)Am, (244)Cm and (245)Cm) and long-lived fission products (LLFPs: (79)Se, (93)Zr, (99)Tc, (107)Pd, (129)I and (135)Cs), and yet are hard to be handled. In this work, we propose a scheme that can transmute almost all the MAs and LLFPs with a lead-cooled fast reactor (LFR). In this scheme, the MAs and the LLFPs are loaded to the fuel assembly and the blanket assembly for transmutation, respectively. In order to study the effect of MAs loading on the operation of the core, the neutron flux distribution, spectra, and the k(eff) are further compared with and without MAs loading. Then the LLFPs composition is optimized and the support ratio is obtained to be 1.22 for (237)Np, 1.63 for (241)Am, 1.27 for (243)Am, 1.32 for (79)Se, 1.53 for (99)Tc, 1.02 for (107)Pd, and 1.12 for (129)I, respectively, indicating that a self-sustained transmutation can be achieved. Accordingly, the transmutation rate of these nuclides was 13.07%/y for (237)Np, 15.18%/y for (241)Am, 13.34%/y for (243)Am, 0.58%/y for (79)Se, 0.92%/y for (99)Tc, 1.17%/y for (107)Pd, 0.56%/y for (129)I. Our results show that a lead-cooled fast reactor can be potentially used to manage nuclear wastes with high levels of long-lived radioactivity.
