作者机构：
[Zhang, Shuai; Cao, Jiantao] Xian Univ Sci & Technol, Coll Energy Sci & Engn, Xian 710054, Shaanxi, Peoples R China.;[Hong, Changshou; Cao, Jiantao; Liu, Yong] Univ South China, Hunan Prov Engn Res Ctr Radioact Control Technol, Hengyang 421001, Hunan, Peoples R China.;[Hong, Changshou; Cao, Jiantao; Liu, Yong] Univ South China, Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Hunan, Peoples R China.;[Liu, Jun] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Hunan, Peoples R China.;[Lei, Bo] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Cao, Jiantao] X;[Cao, Jiantao] U;Xian Univ Sci & Technol, Coll Energy Sci & Engn, Xian 710054, Shaanxi, Peoples R China.;Univ South China, Hunan Prov Engn Res Ctr Radioact Control Technol, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Hunan, Peoples R China.
摘要：
On the basis of reviewing the existing research status of cumulative damage of the rock mass and summarizing the existing engineering application fields of radon, this paper attempts to apply radon detection technology to the research field of rock damage mechanics so as to monitor the evolution process of cumulative damage of the rock mass. Based on the above research purposes, a test device for detecting cumulative damage of radioactive rocks by surface radon gas was designed, and the test results were obtained by integrating the system to implement the test scheme. Due to the limitation of the nonmetallic ultrasonic detector, a single blasting damage value of 25 detection points appears after a single blasting measurement, which is a surface longitudinal wave velocity characterization damage set, while the surface radon exhalation rate in the subsequent analysis process is an overall characterization value; that is, the existence of damage directly affects the whole body radon exhalation rate of the test block, and the data dimensions of the two are different. In order to solve this problem, we try to introduce three data evaluation methods, the average weighting method, grey prediction method, and K-means clustering algorithm, and compare the feasibility of these three methods. It is proved that there is a certain linear relationship between the radon exhalation rate and the cumulative damage, which further verifies the feasibility of using radon to detect cumulative damage. The results show that the cumulative damage of loaded radioactive rock test blocks can be reflected by surface radon detection technology, and finally, the correlation between the cumulative damage characteristics and the continuous change of the body radon exhalation rate is obtained. Based on the correlation, the body radon exhalation rate is introduced into the field of fractured rock mass damage characterization, which is mutually improved with common monitoring methods such as acoustic emission and microseismic monitoring, supplementing and enriching the means of rock mass damage evolution characterization, providing a theoretical basis for finely describing the whole process of fracture closure and initiation, and finally accurately ensuring the stability of surrounding rock under the action of deep underground engineering excavation disturbance.
期刊：
EUROPEAN PHYSICAL JOURNAL C,2021年81(1):1-7 ISSN：1434-6044
通讯作者：
Chu, Peng-Cheng
作者机构：
[Liu, He; Zhang, Xiao-Min; Chu, Peng-Cheng] Qingdao Univ Technol, Sci Sch, Res Ctr Theoret Phys, Qingdao 266033, Peoples R China.;[Liu, He; Zhang, Xiao-Min; Chu, Peng-Cheng] Qingdao Univ Technol, Res Ctr Theoret Phys, Qingdao 266033, Peoples R China.;[Zhou, Yi] Qingdao Univ Sci & Technol, Sch Math & Phys, Qingdao 266033, Peoples R China.;[Jiang, Yao-Yao; Ma, Hong-Yang] Qingdao Univ Technol, Qingdao 266033, Peoples R China.;[Jiang, Yao-Yao; Ma, Hong-Yang] Qingdao Univ Technol, Quantum Phys Lab, Qingdao 266033, Peoples R China.
通讯机构：
[Chu, Peng-Cheng] Q;Qingdao Univ Technol, Sci Sch, Res Ctr Theoret Phys, Qingdao 266033, Peoples R China.;Qingdao Univ Technol, Res Ctr Theoret Phys, Qingdao 266033, Peoples R China.
摘要：
We study the thermodynamic properties of asymmetric quark matter and large mass quark stars within the confined-isospin-density-dependent-quark-mass model. We find that the quark matter symmetry energy should be very large in order to describe the recent discovered heavy compact stars PSR J0348+0432 (
$$\text {2.01}\pm \text {0.04}M_{\odot }$$
), MSP J0740+6620 (
$$\text {2.14}\pm ^\text {0.10}_\text {0.09}M_{\odot }$$
of 68.3
$$\%$$
credibility interval and
$$\text {2.14}\pm ^\text {0.20}_\text {0.18}M_{\odot }$$
of 95.4
$$\%$$
credibility interval) and PSR J2215+5135 (2.27
$$\pm ^\text {0.10}_\text {0.09}M_{\odot }$$
) as QSs. The tidal deformability
$$\Lambda _{1.4}$$
of the QSs is also investigated in this work, and the result indicates that
$$\Lambda _{1.4}$$
may depend on the isospin effects and the strength / orientation distribution of the magnetic fields inside the quark stars.
作者机构：
[Wang, Li; Huang, Zhidong; Ma, Rui] Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China.;[Huang, Zhidong; Xie, Quan; Ma, Rui] Guizhou Univ, Inst Adv Optoelect Mat & Technol, Guiyang 550025, Peoples R China.;[Zhou, Juan] Univ South China, Coll Mech Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Ma, Rui] G;Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China.
关键词：
Composite materials;Simulation and modelling;Electronic structures;Electromagnetic wave absorption properties
摘要：
Electronic structures and electromagnetic wave absorption properties of Fe3Si/polypyrrole (PPy) composites are investigated by using first principles methods based on plane-wave pseudopotential theory. The calculation of electric structures shows that the Fe3Si/PPy composite presents typical metal properties. The real and imaginary parts of the dielectric constant of Fe3Si/PPy are larger than those of Fe3Si. The maximum absorption coefficient of Fe3Si is larger than that of Fe3Si/PPy, and the maximum absorption coefficients of both materials all increase first and then decrease. However, the variation range of the absorption coefficient of Fe3Si/PPy is wider than that of Fe3Si. The reflection coefficient and maximum extinction coefficient of Fe3Si/PPy are larger than those of Fe3Si. The maximum reflection coefficient of Fe3Si/PPy is greater than that of Fe3Si, and the maximum reflection coefficients of Fe3Si/PPy and Fe3Si are 0.81 and 0.91, respectively. In terms of loss function and refractive index, Fe3Si/PPy has more practical value than Fe3Si. (C) 2020 Elsevier B.V. All rights reserved.
期刊：
Building and Environment,2021年199:107834 ISSN：0360-1323
通讯作者：
William(Wei) Zhang
作者机构：
[Wang, Jun] Univ South China, Sch Mech Engn, Hengyang, Peoples R China.;[Wang, Li; Zhang, William(Wei)] HangZhou Long Beach Technol Ltd Co, Hangzhou, Zhejiang, Peoples R China.;[Zhang, William(Wei); Wang, Jun] Univ South China, YangTze Delta Zhuji Res Inst, Zhuji, Zhejiang, Peoples R China.
通讯机构：
[William(Wei) Zhang] H;HangZhou Long Beach Technology Ltd. Co, Binjiang, Hangzhou, Zhejiang, PR China<&wdkj&>YangTze Delta (Zhuji) Research Institute of University of South China, Zhuji, Zhejiang, PR China
关键词：
Large eddy simulation;Projection method;Synthetic inflow turbulence;Turbulence energy spectrum
期刊：
JOURNAL OF PHYSICS-CONDENSED MATTER,2021年33(50):503002 ISSN：0953-8984
通讯作者：
Jiujiu Chen
作者机构：
[Chen, Jiujiu; Huang, Hongbo] Hunan Univ, Coll Mech & Vehicle Engn, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.;[Huo, Shaoyong] Univ South China, Coll Mech Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Jiujiu Chen] S;State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, People's Republic of China
摘要：
Topological elastic metamaterials have emerged as a new frontier in the quest of topological phases in condensed matter physics. Their exotic topological properties open a wealth of promising engineering-oriented applications that are difficult to realize with traditional elastic metamaterials, such as robust and defect insensitive waveguiding, signal sensing, and splitting. In this review, we retrospectively examine the underlying physical concept of topologically ordered states of elastic waves, starting from the one-dimensional example based on the Su-Schrieffer-Heeger model. We then move on to two-dimensional topological metamaterials, discussing elastic analogues of quantum Hall, pseudospin-Hall, valley-Hall phases. Finally, we survey the latest developments in the field including three-dimensional elastic topological phases and higher-order topological insulators. Altogether, this paper provides a comprehensive overview of the flourishing research frontier on topological elastic metamaterials, and highlights prominent future directions in this field.
作者机构：
[Liu, He; Chu, Peng-Cheng] Qingdao Univ Technol, Res Ctr Theoret Ph Sics, Sci Sch, Qingdao 266033, Peoples R China.;[Li, Xiao-Hua] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Zhang, Jia-Wei] Chongqing Univ Sci & Technol, Dept Phys, Chongqing 401331, Peoples R China.
通讯机构：
[Chu, Peng-Cheng] Q;Qingdao Univ Technol, Res Ctr Theoret Ph Sics, Sci Sch, Qingdao 266033, Peoples R China.
摘要：
We investigate the properties of the equation of state (EOS), the quark fraction, and the isospin asymmetry for strange quark matter (SQM) under constant magnetic field within the quasiparticle model. Our results indicate that the effect of the magnetic field is important for the properties of strange quark matter, and the recently discovered heavy compact stars PSR J0348+0432 , MSR J0740+6620 , PSR J2215+5135 , and especially the GW190814s secondary component m2 can be well described as quark stars within the quasiparticle model under magnetic fields by approximately using spherically symmetric Tolman-Oppenheimer-Volkov (TOV) equations.
作者机构：
[Chen, Haiwen; Liu, Min; Mo, Jiajun; Hu, Shengli] Univ South China, Coll Nucl Sci & Technol, Hengyang, Peoples R China.;[Liu, Min] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang, Peoples R China.
通讯机构：
[Liu, Min] U;Univ South China, Coll Nucl Sci & Technol, Hengyang, Peoples R China.;Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang, Peoples R China.
关键词：
Cobalt-doped iron pyrite;nanoparticles;Mössbauer spectroscopy;magnetization
摘要：
Co0.1Fe0.9S2 nanoparticles were synthesized by solvothermal method and studied by Mössbauer spectroscopy in the cooling process. Magnetic phase transition can be testified by Mössbauer investigation. The spectrum recorded at room temperature consists of a simple quadrupole doublet, the values of isomer shift and quadrupole splitting of doublet increase gradually with the decrease of temperature. However, the spectrum consists of a sextet when the temperature drops further to 25 K, indicating that the sample changed from paramagnetism to ferromagnetism. The magnetic field at low temperature is probably super-transferred field from the magnetically ordered cobalt atoms through a super-exchange mechanism.
摘要：
Gallium oxide (Ga2O3) single crystals are an ultrawide bandgap semiconductor with wide industrial applications. Ultra-precision grinding is an essential shaping process in the fabrication of high quality Ga2O3 substrates. However, due to the lack of understanding of their removal mechanism, the development of high efficiency and low-damage grinding technology for Ga2O3 substrates faces great challenges. In this work, the removal mechanism of (010) beta-Ga2O3 was systematically investigated by use of single grit grinding and nanoscratching. The results showed that its removal involved both ductile cutting and brittle fracture under conventional grit-grinding conditions. The ductile deformation of beta-Ga2O3 was dominated by the formation of stacking faults, while in its brittle removal region microcracks were initiated and propagated mainly along the (200) lattice plane. A theoretical force model that reflects the combined effects of ductile and brittle removal was developed to further elucidate the removal mechanism. The calculated force was in good agreement with the experimental results, clearly indicating that the transition of removal modes was affected by the chip cross-sectional area.
期刊：
EUROPEAN PHYSICAL JOURNAL A,2021年57(11):1-8 ISSN：1434-6001
通讯作者：
Li, Xiao-Hua
作者机构：
[Li, Xiao-Hua; Chen, Jiu-Long] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Chu, Peng-Cheng] Qingdao Technol Univ, Sch Sci, Qingdao 266000, Peoples R China.
通讯机构：
[Li, Xiao-Hua] U;[Li, Xiao-Hua] H;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Peoples R China.
摘要：
In the present work we systematically study the half-lives of proton radioactivity for spherical proton emitters with
$${Z\ge 69}$$
based on two-potential approach. While the nuclear potential of the emitted proton-daughter nucleus is adopted by a parameterized cosh type, the parameters of the depth and diffuseness for nuclear potential are determined by fitting experimental data of 32 spherical proton emitters. In order to reduce the deviations between experimental half-lives and calculated ones, we propose a simple analytic expression for formation probability of proton radioactivity with the same orbital angular momentum l. The results indicate that the formation probability can be simply described by a formula of
$$A_d^{1/3}$$
. Moreover, the linear relationship between the formation probability and the fragmentation potential also exists. The calculated half-lives can well reproduce the experimental data.
摘要：
The study of Weyl semimetals (WSs) has been attracting widely attention due to the fact that the Weyl point (WP) and associated topological invariants enable WSs to exhibit a variety of unusual properties, including robust surface wave and chiral anomaly. However, for the elastic analogue of ideal type-II WS, having the strongly tilted cone dispersion and conical Fermi surface, its realization still remains elusive. Here, we show an elastic type-II WS in three-dimensional (3D) solid phononic crystals (PnCs) with the broken spatial inversion symmetry. The ideal type-II WPs with opposite topological charges (+/- 1), opened Fermi-arc-like surface states and associated robust transport for 3D elastic wave are demonstrated. Furthermore, we reveal the phase transition between the elastic type-II WSs and two valley topological insulators (TIs). At the domain wall of two 3D PnCs with different valley topological phase, the Fermi-circle-like surface states are obtained. Our research provides a platform for the exploration of Weyl physics on a macroscopic mechanical structure.
作者机构：
[Wen, Litao; Chen, Yong] Univ South China, Coll Mech Engn, Hengyang 421000, Peoples R China.;[Wen, Litao; Yin, Cuicui; Zheng, Kaihong; Zhang, Zhibo; Zhou, Nan] Guangdong Acad Sci, Inst Mat & Proc, Guangzhou 510651, Peoples R China.;[Wen, Litao; Yin, Cuicui; Zheng, Kaihong; Zhang, Zhibo; Zhou, Nan] Guangdong Prov Key Lab Met Toughening Technol & A, Guangzhou 510000, Peoples R China.;[Wang, Shuncheng] Guangdong Xingfa Aluminum Co Ltd, Foshan 528137, Peoples R China.
通讯机构：
[Zhibo Zhang; Kaihong Zheng] A;Authors to whom correspondence should be addressed.<&wdkj&>Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510651, China<&wdkj&>Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Guangzhou 510000, China
摘要：
As-cast irons and aluminum alloys are used in various industrial fields and their phase and microstructure properties are strongly affected by the undercooling degree. However, existing studies regarding the undercooling degree are mostly limited to qualitative analyses. In this paper, a quantitative analysis of the undercooling degree is performed by collecting experimental data and employing machine learning. Nine machining learning models including Random Forest (RF), eXtreme Gradient Boosting (XGBOOST), Ridge Regression (RIDGE) and Gradient Boosting Regressor (GBDT) methods are used to predict the undercooling degree via six features, which include the cooling rate (CR), mean atomic covalence radius (MAR) and mismatch (MM). Four additional effective models of machine learning algorithms are then selected for a further analysis and cross-validation. Finally, the optimal machine learning model is selected for the dataset and the best combination of features is found by comparing the prediction accuracy of all possible feature combinations. It is found that RF model with CR and MAR features has the optimal performance results for predicting the undercooling degree.
作者机构：
[Kahve, Cemi E.; Fellerhoff, Jan; Hopmann, Christian] Rhein Westfal TH Aachen, IKV Inst Plast Proc Ind & Craft, Seffenter Weg 201, D-52074 Aachen, Germany.;[Xiao, Chenglong] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Xiao, Chenglong] U;Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.
关键词：
Injection molding;Simulation;Modelling;Inline data acquisition;Specific volume
摘要：
The material-inherent specific volume behavior of polymers is highly important for producing dimensionally accurate injection molded parts since the shrinkage and the shrinkage-induced warpage are attributable to the specific volume behavior. Thereby, the prevalent process parameters melt temperature and cavity pressure significantly influence the prevailing specific volume. Many empirical models describe this pressure-specific volume-temperature (pvT) behavior. To minimize part warpage, a segmented dynamic mold temperature control has been developed which aims to homogenize the specific volume of a platen-shaped geometry. The mold temperature control is thereby controlled by a model predictive control concept, which predicts the local specific volume using an empirical pvT-model. A modified Tait-pvT-model is used for the prediction, which considers the effect of the cooling rate on the specific volume. To achieve homogenization of the local specific volume, the pvT-model is validated regarding its prediction accuracy by comparing the predicted specific volumes with specific volume measurements of molded test specimens using processing points with varying cooling rates. For the predictions of the final specific volumes, two approaches regarding the selection of the cooling rate were used. The results show that the selection of the cooling rate within the modified Tait model has a significant impact on the calculated final specific volume.
期刊：
EUROPEAN PHYSICAL JOURNAL C,2021年81(7):1-9 ISSN：1434-6044
通讯作者：
Peng-Cheng Chu
作者机构：
[Liu, He; Zhang, Xiao-Min; Jiang, Yao-Yao; Chu, Peng-Cheng] Qingdao Univ Technol, Res Ctr Theoret Phys, Sci Sch, Qingdao 266033, Peoples R China.;[Liu, He; Zhang, Xiao-Min] Qingdao Univ Technol, Res Ctr Theoret Phys, Qingdao 266033, Peoples R China.;[Zhang, Zhen] Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China.;[Li, Xiao-Hua] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.
通讯机构：
[Peng-Cheng Chu] T;The Research Center for Theoretical Physics, Science School, Qingdao University of Technology, Qingdao, China
摘要：
We study the thermodynamic properties of asymmetric quark matter, large mass quark stars (QSs), and proto-quark stars (PQSs) within the quasiparticle model. Considering the effects of temperature within quasiparticle model can significantly influence the EOS and the entropy of strange quark matter (SQM), quark fractions in SQM, as well as the tidal deformability and the maximum mass of PQSs along the star evolution line. Our results indicate that the recent discovered heavy compact stars PSR J0348+0432, MSR J0740+6620, PSR J2215+5135, and especially the GW190814’s secondary component
$$m_2$$
can be well described as QSs within the quasiparticle model. The tidal deformability for the QSs describing the heavy compact stars is extremely large, which can not well describe GW170817 as QSs, and the effects of the temperature in the heating process along the star evolution will further increase the tidal deformability and the maximum mass of PQSs.
期刊：
Applied Radiation and Isotopes,2021年174:109712 ISSN：0969-8043
通讯作者：
Lei, Lin(xlinw@126.com)
作者机构：
[Lei, JieHeng] Univ South China, Sch Elect Engn, Hengyang 421001, Hunan, Peoples R China.;[Lei, Lin] Univ South China, Sch Resources & Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Yin, Zeyuan; Lei, ZeYong; Qin, QianQian] Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Lin Lei] S;School of Resources & Environment and Safety Engineering, University of South China, Hengyang, 421001, Hunan province, China
关键词：
Gamma radiation measurement;Uranium fluoride;Materials level;Algorithms of gamma radiation field
摘要：
The measurement of material level change in uranium fluorination has an essential influence on uranium production quality. In this study, a method to determine the level change of uranium fluorination mixture in the hopper by online radiation meter outside hopper is established. We have designed an experiment to study the change of radiation field outside the hopper with a known height of radioactive material to discover its regular pattern. The experimental results show that when the probe is placed 50 mm away from the cylinder wall, the average radiation dose is more significant, and the change of radiation dose measured by the instrument at this position is more evident than that at other positions. Then through the measurement of the external radiation field of the hopper with unknown material level to estimate the material level, and by opening the cover of hopper to verify the accuracy of the material level measurement method. Based on the experimental results and theoretical analysis, a method and formula for judging the mixture material are proposed. This method can quickly determine the level of uranium fluoride mixture in the hopper online, realize the accurate control of material parameters in the process of uranium conversion, and improve the quality of uranium conversion products.
摘要：
Uranyl carbonate (UC) and silica colloids (cSiO(2)) are widely distributed in carbonate-rich subsurface environments associated with uranium pollution. Mobile colloids such as cSiO(2) can affect uranium's transport efficiency in the groundwater environment. Therefore, elucidating the mechanism of UC and cSiO(2) co-transport in a saturated porous medium with different ionic strength (IS), pH, and UC concentration is essential for the prevention and control of groundwater radioactive pollution. At low UC concentrations (<2.1 x 10(-5) M), cSiO(2) is more prone to be deposited on the surfaces of quartz sand (QS) than UC, resulting in cSiO(2) preventing UC transport. Compared to pH 7 and 9, at pH 5 the adsorption of uranium [in the form of 81.5% UO2CO3(aq), 8.6% UO22+, and 5.2% UO2OH+] on cSiO(2) renders cSiO(2) more prone to aggregate, causing smaller amounts of cSiO(2) (86.6%) and UC (55.8%) to be recovered. Mechanisms responsible for the evolution of the pH and zeta potential in effluents have been proposed. Chemical reactions (ligand-exchange reactions and deprotonation) that occur in the QS column between UC and cSiO(2)/QS cause the pH of the suspension to varying, which in turn causes changes in the zeta potential and particle size of cSiO(2). Eventually, the recovery rates of cSiO(2) and UC are changed, depending upon the colloid particle size. Changes in ionic strength can seriously affect the stability of cSiO(2) particles, and that effect is more significant when UC is present. Moreover, colloidal filtration theory, a non-equilibrium two-site model, and the Derjaguin-Landau-Verwey-Overbeek theory successfully describe the individual-transport and co-transport of cSiO(2) and UC in the column. This study provides a strong basis for investigating UC pollution control in porous media. (C) 2020 Elsevier B.V. All rights reserved.
作者机构：
[Li, Xiao-Hua; Pan, Xiao; Liu, Hong-Ming; Xiang, Dong; Zou, You-Tian] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[He, Biao] Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China.;[Li, Xiao-Hua; Xiang, Dong] Univ South China, Natl Exemplary Base Int Sci & Tech Collaborat Nuc, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua; Xiang, Dong] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Peoples R China.
通讯机构：
[Xiao-Hua Li; Dong Xiang] S;School of Nuclear Science and Technology, University of South China, Hengyang 421001, China<&wdkj&>National Exemplary Base for International Sci & Tech. Collaboration of Nuclear Energy and Nuclear Safety, University of South China, Hengyang 421001, China<&wdkj&>Cooperative Innovation Center for Nuclear Fuel Cycle Technology & Equipment, University of South China, Hengyang 421001, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang 421001, China<&wdkj&>National Exemplary Base for International Sci & Tech. Collaboration of Nuclear Energy and Nuclear Safety, University of South China, Hengyang 421001, China<&wdkj&>Cooperative Innovation Center for Nuclear Fuel Cycle Technology & Equipment, University of South China, Hengyang 421001, China<&wdkj&>Key Laboratory of Low Dimensional Quantum Structures and Quantum Control, Hunan Normal University, Changsha 410081, China
关键词：
the released energy of proton radioactivity;liquid-drop model;shell correction
摘要：
In this work, based on the liquid-drop model and considering the shell correction, we propose a simple formula to calculate the released energy of proton radioactivity (Qp). The parameters of this formula are obtained by fitting the experimental data of 29 nuclei with proton radioactivity from ground state. The standard deviation between the theoretical values and experimental ones is only 0.157 MeV. In addition, we extend this formula to calculate 51 proton radioactivity candidates in region 51 ≤ Z ≤ 83 taken from the latest evaluated atomic mass table AME2016 and compared with the Qp calculated by WS4 and HFB-29. The calculated results indicate that the evaluation ability of this formula for Qp is inferior to WS4 while better than HFB-29.
摘要：
In this study, a structurally well-designed PdO@WO3 core-shell, p-n heterojunction architecture was fabricated using a facile hydrothermal method. Its material characterization was performed via X-ray diffractometry, X-ray photoelectron spectroscopy, electron scanning microscopy, and transmission electron microscopy analyses. Besides, the gas sensing properties of pure WO3, PdO-WO3, and PdO@WO3 nanocomposites were investigated. By benefiting from the unique synergistic effect between catalytic sensing and p-n heterojunction structure, the PdO@WO3 core-shell nanostructure showed considerably enhanced acetone sensing performance compared with the other structures; especially, its response toward 50 ppm acetone gas was up to 40, four times higher than that of the pure WO3 sensor. Its response/recovery times were also significantly reduced and its optimal operating temperature decreased from 250 degrees C to 200 degrees C. Finally, the possible sensing mechanism for the proposed PdO@WO3 core-shell, p-n heterojunction architecture is discussed here; the considerable enhancement in the acetone sensing capability could be attributed to its well-designed fabrication.
