作者机构：
[Tang, Jiachang; Mi, Chenji] Hunan Univ Technol, Dept Mech Engn, Zhuzhou 412007, Peoples R China.;[Cao, Lixiong] Hunan Univ, Coll Mech & Vehicle Engn, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Peoples R China.;[Fu, Chunming] Univ South China, Coll Mech Engn, Hengyang 421001, Peoples R China.;[Liu, Qiming] Hebei Univ Technol, Sch Mech Engn, State Key Lab Reliabil & Intelligence Elect Equip, Tianjin 300401, Peoples R China.
通讯机构：
[Jiachang Tang; Chenji Mi] D;Department of Mechanical Engineering, Hunan University of Technology, Zhuzhou, People’s Republic of China<&wdkj&>Department of Mechanical Engineering, Hunan University of Technology, Zhuzhou, People’s Republic of China
期刊：
Journal of the Brazilian Society of Mechanical Sciences and Engineering,2022年44(9):1-17 ISSN：1678-5878
通讯作者：
Biao Luo<&wdkj&>Wei Li
作者机构：
[Zhou, Rongan; Luo, Biao] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Luo, Biao] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Li, Wei] Univ Sci & Technol Beijing, Sch Mech Engn, Beijing 100083, Peoples R China.
通讯机构：
[Biao Luo; Wei Li] S;School of Mechanical Engineering, University of South China, Hengyang, China<&wdkj&>Cooperative Innovation Centre for Nuclear Fuel Cycle Technology and Equipment, University of South China, Hengyang, China<&wdkj&>School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, China
摘要：
To study the influence of tooth profile modification (TPM) on the dynamic characteristics of gear transmission systems, a new dynamics modeling method for a spur gear pair with TPM, namely the equivalent static error method, in which the TPM amount is considered part of the static error of the system, is proposed. The concept of equivalent static transmission error (Delta TE) is proposed, and the calculation method is given. The dynamic equation of the system after TPM is derived. Then, the dynamic displacement, velocity, and acceleration responses and the dynamic meshing force (DMF) of the system with TPM are analyzed, and the results are compared with those of the existing method (Equivalent meshing stiffness method). The results show that TPM is equivalent to increasing the load excitation of the system, and the load increment is equal to the sum of the products of the meshing stiffness and TPM amount of each related single tooth pair. The dynamic response and DMF of the modified system first decrease and then increase as the maximum modification amount increases. The result obtained by the proposed method is more accurate than that of the existing method, especially when the gears with a large maximum modification amount. Furthermore, the correctness and validity of the method are verified by comparison with the existing method.
期刊：
Particulate Science and Technology,2022年40(6):712-721 ISSN：0272-6351
通讯作者：
Deng, Rong
作者机构：
[Deng, Rong] Univ South China, Sch Mech Engn, Hengyang 421000, Hunan, Peoples R China.;[Tan, Yuanqiang] Huaqiao Univ, Inst Mfg Engn, Xiamen, Peoples R China.;[Xiao, Xianwu] Univ XiangTan, Sch Mech Engn, Xiangtan, Peoples R China.
通讯机构：
[Deng, Rong] U;Univ South China, Sch Mech Engn, Hengyang 421000, Hunan, Peoples R China.
关键词：
Fresh concrete;discharging homogeneity;discharge efficiency;optimization of blade structural parameter;truck mixer
摘要：
The discharging homogeneity and discharge efficiency of fresh concrete are the most important aspects of engineering practices of researchers. In this study, the influence of the main structural parameters of the blade on the discharge homogeneity and efficiency is numerically simulated through an orthogonal test based on the discrete element method. The order of influence of the blade structural parameters on the discharging homogeneity was obtained through range analysis and determined: t-shaped blade width > blade width > blade pitch > blade swing angle. Regarding the discharge efficiency, the influence order is blade pitch > blade swing angle > t-shaped blade width > blade width. Considering the discharging homogeneity and discharge efficiency, the optimal width of the t-shaped blade, blade pitch, blade width, and blade swing angle of the front cone-central cylinder-back cone were established as 120 mm, 1800-2280-1680(mm), 480-440-390 (mm), and 90 degrees-90 degrees-75 degrees, respectively.
作者机构：
[Hou, Wei; Wang, Hongqiang; Wang, Qingliang; Li, Hui; Zhang, Rui; Hu, Eming; Lei, Zhiwu] Univ South China, Sch Resource & Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Hou, Wei; Wang, Qingliang] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Wang, Hongqiang] Univ South China, Hengyang Key Lab Soil Pollut Control & Remediat, Hengyang 421001, Peoples R China.;[Wang, Qingliang; Hu, Eming; Lei, Zhiwu] Univ South China, Hunan Key Lab Rare Met Minerals Exploitat & Geol, Hengyang 421001, Peoples R China.
通讯机构：
[Qingliang Wang] S;School of Resource & Environment and Safety Engineering, University of South China, Hengyang, 421001, China<&wdkj&>Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment, University of South China, Hengyang, 421001, China<&wdkj&>Hunan Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes, University of South China, Hengyang, 421001, China
关键词：
digital metasurface;passive plasmonic switching;plasmonic Fano resonance
摘要：
Plasmonic Fano resonance (FR) that contributes to multitudinous potential applications in subwavelength nanostructures can facilitate the realization of tunable wavelength selectivity for controlling light–matter interactions in metasurfaces. However, the plasmonic FR can be generated in metasurfaces with simple or complex geometries, and few of them can support flexible amplitude modulation and multiwavelength information transfer and processing. Here, we study the near-infrared plasmonic FR in a hybrid metasurface composed of concentrically hybridized parabolic-hole and circular-ring-aperture unit cells, which can induce polarization-dependent dual-wavelength passive plasmonic switching (PPS) and digital metasurface (DM). It is shown that the designable plasmonic FR can be realized by changing the geometric configurations of the unit cells. In particular, owing to the polarization-dependent characteristic of FR, it is possible to fulfill a compact dual-wavelength PPS with high ON/OFF ratios in the related optical communication bands. Moreover, such PPS that manipulates the amplitude response of the transmitted spectrum is an efficient way to reveal a 1-bit DM, which can also be rationally extended to a 2-bit DM or more. Our results suggest a pathway for studying polarization-dependent PPS and programmable metasurface devices, yielding possibilities for subwavelength nanostructures in optical communication and information processing.
作者机构：
[Guo, Jian] Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.;[Chen, Lei; Qian, Linmao; Gao, Jian; Wu, Hanqiang; Xiao, Chen] Southwest Jiaotong Univ, Tribol Res Inst, State Key Lab Tract Power, Chengdu 610031, Sichuan, Peoples R China.;[Xiao, Chen] Adv Res Ctr Nanolithog ARCNL, Sci Pk 106, NL-1098 XG Amsterdam, Netherlands.;[Li, Gengzhuo; Wu, Hanqiang] Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Guangdong, Peoples R China.
通讯机构：
[Chen Xiao] T;Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, Sichuan, 610031, PR China<&wdkj&>Advanced Research Center for Nanolithography (ARCNL), Science Park 106, Amsterdam, 1098XG, the Netherlands
摘要：
Mechanical activation in mechanical removal of GaN using diamond tip and mechanochemical removal using Al2O3 tip are described by the Archard equation and mechanically assisted Arrhenius-type kinetic model, respectively. Evident material-removal under elastic contact occurs with the assistance of interfacial mechanochemical reactions. By analyzing the mechanochemical reactions with Arrhenius-type kinetic model and Hertzian contact mechanics, the critical activation volume and activation barrier are determined semiquantitatively. The mechanical activation originating from the chemically active counter-surface facilitates the mechanochemical atomic attrition by altering the energy barrier of the reaction kinetics. This work can provide deep insights into the mechanochemical-removal mechanism of GaN.
摘要：
Separatrix crossing stands for the continuation of the modulation instability into the strong depleted regime and is responsible for the symmetry breaking nature of the recurrence phenomenon. The near-separatrix dynamic for recurrent modulational instability is of great importance because it is closely associated with the formation of rogue breather structures. Here, we have developed the underlying phase-space structure of nonlinear modulation instability by treating the three-mode truncate model as a simple oscillator. This allowed us to reveal the high sensitivity of the switching dynamics characterized by inner or outer trajectories to the initial condition around a separatrix. Our results present a major step forward towards the complete understanding of recurrent modulational instability in a truly conservative setting and can provide a guidance to experimentally measure the involved recursive behaviors.
通讯作者：
Lei Ying<&wdkj&>Xingzhu Wang<&wdkj&>Fei Huang
作者机构：
[Ying, Lei; Li, Jingwen; Li, Zhenye; Peng, Feng; Huang, Fei; Cao, Yong; Quan, Huilei; Wu, Hongbin] South China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China.;[Li, Zhenye] Univ South China, Coll Mech Engn, Hengyang 421001, Peoples R China.;[Wang, Xingzhu] Southern Univ Sci & Technol, SUSTech Acad Adv Interdisciplinary Studies, Shenzhen 518055, Guangdong, Peoples R China.
通讯机构：
[Lei Ying; Fei Huang] I;[Xingzhu Wang] S;Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640 China<&wdkj&>SUSTech Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen, 518055 China
关键词：
all-polymer solar cells;Flory−Huggins parameters;miscibility;solid additives
摘要：
Optimization of the photovoltaic performance of all-polymer solar cells (all-PSCs) includes delicate control of the film morphology of the light-harvesting layer. Although miscibility of polymer donors and polymer acceptors plays a critical role in the description of film morphology of all-PSCs, the mixing thermodynamics is unrevealed. Herein, we demonstrate that by incorporating 1% weight ratio of PC71BM as the solid additive into the blends of electron-donating polymer PTzBI-oF and electron-accepting polymer PFA1, the miscibility of donor/acceptor can be improved by virtue of forming a favorable phase separation, which leads to an increased charge carrier transport and simultaneously enhanced fill factor. The maximum power conversion efficiency is thereby improved from 14.6% to 15.6%. The miscibility of two components in the photoactive layer can be quantitatively described using the Flory-Huggins interaction parameter (chi). In particular, a correlation between the Flory-Huggins parameters of the two components, in terms of phase separation morphology and device performance of all-PSCs, is established and the mechanism by which PC71BM is added to this system is explored. This study establishes guidelines for the selection of solid additives when optimizing the efficiency of all-PSCs and promotes the integration and development of polymer physics and organic photovoltaics.
作者机构：
[Huang, Jinghao; Zou, Shuliang] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Yang, Chen; Huang, Jinghao; Zou, Shuliang; Xiao, Weiwei; Tang, Dewen] Univ South China, Hunan Prov Key Lab Emergency Safety Technol & Equ, Hengyang 421001, Hunan, Peoples R China.;[Yang, Chen; Xiao, Weiwei; Tang, Dewen] Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.;[Zhang, Kun; Yu, Hongxing; Zhang, Lin] Nucl Power Inst China, Chengdu 610213, Sichuan, Peoples R China.
通讯机构：
[Weiwei Xiao] H;Hunan Provincial Key Laboratory of Emergency Safety Technology and Equipment for Nuclear Facilities, University of South China, Hengyang, Hunan 421001, China<&wdkj&>School of Mechanical Engineering, University of South China, Hengyang, Hunan 421001, China
摘要：
The present work is aimed to investigate the influences of arc current on the microstructure evolution of the as-deposited Cr coatings for accident tolerant fuel. Cr coatings were prepared on the surface of Zr-4 alloy by multi-arc ion plating with different arc currents. Electron backscattering diffraction (EBSD) technology was employed to characterize the microstructure evolution of the as-deposited Cr coatings, including the distribution of grain boundaries, the mean grain size, the crystallographic orientation distribution, the dislocation density and dynamic recrystallization (DRX). The results showed that: regarding the mean grain size of the Cr coating, the largest was that prepared by 80A, followed by 100A, 70A and 90A; regarding the number fraction of HAGBs, the highest was that prepared by 80A, followed by 90A, 100A and 70A; regarding the grain morphology, the Cr coating prepared by 70A exhibited equiaxed grains without obvious texture, while that prepared by 80A, 90A and 100A had elongated columnar grains along the building direction; regarding the crystal phase, the Cr coating prepared by 80A, 90A and 100A exhibited the (100)〈001〉 texture component; regarding the dislocation density, there was a large number of scattered high dislocation density regions in the Cr coating prepared by 70A, the high dislocation density regions only appeared on the surface layer in the Cr coating prepared by 90A, and along the boundaries of elongated grains in the Cr coating prepared by 100A, while it was almost non-existent in the Cr coating prepared by 80A; regarding the DRX, discontinues DRX (DDRX) was the principal DRX mechanism for the Cr coating prepared by 70A, while continues DRX (CDRX) was the dominant DRX mechanism for the Cr coatings prepared by 80A, 90A and 100A.
期刊：
Chemical Physics Letters,2021年780:138913 ISSN：0009-2614
通讯作者：
Liu, Min(liuhart@126.com)
作者机构：
[Chen, Haiwen; Liu, Min; Lu, Zeyi] Univ South China, Coll Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Liu, Min] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang, Hunan, Peoples R China.
通讯机构：
[Min Liu] C;College of Nuclear Science and Technology, University of South China, Hengyang 421001, China<&wdkj&>Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment, University of South China
关键词：
Charge transfer;Magnetic properties;Prussian blue analogs;Structural distortion;Thermal induction
摘要：
The K0.4Co1.3[Fe(CN)6]center dot nH2O samples were prepared by co-precipitation method. Powder X-ray diffraction showed that only one HT phase existed in the sample prepared at room temperature ([KCoFe]RT). When the preparation temperature rises to 80 degrees C([KCoFe]80 degrees C), the diffraction peak intensity of primary HT phase weakened and another LT phase appeared. The HT and LT phase are both FCC crystal structure with structural parameters of 10.23 angstrom and 9.93 angstrom, respectively. Infrared and Mo center dot ssbauer spectra indicated that part of FeIIILS-CN-CoIIHS were transformed to FeII LS-CN-CoIII LS configuration when preparation temperature rises to 80 degrees C. It indicated that preparation temperature induced charge transfer from CoII to FeIII ions occurred in present sample. Magnetic analysis showed that these cobalt iron cyanides are both ferrimagnetic. The difference of magnetic moments between the two compounds over the entire temperature range is ascribed to the fact that [KCoFe]RT has more paramagnetic central ions than [KCoFe]80 degrees C. The difference between room temperature theoretical and experimental magnetic moments may be attributed to the weak spin-orbit coupling existing for both ions.
摘要：
Whispering-gallery modes (WGMs), confining the resonant photons in nanoscale volumes, have been known to exhibit high-quality factor and sensitivity for electromagnetic waves in the field of nanophotonics. Here, we numerically demonstrate that a metasurface, which consists of periodic arrays with concentrically hybrid rectangular-slot (RS) and circular-ring-aperture (CRA) unit cells, supports polarization-dependent plasmonic sensing and switching in the visible and near-infrared regions. In particular, it is shown that the magnetic plasmon-induced transparency (PIT) effect arises from the coupling between a wideband WGM resonance and a narrowband magnetic dipole resonance mode in the hybrid metasurface. It is of great interest to find that the resonance mode broadening and mode shift sensing can be realized by varying the polarization angle of incident light and the length of the RS structure, respectively. Moreover, a novel and easy-fabricated plasmonic switching can be implemented in the visible and near-infrared regions. By changing the inner radius of the CRA structure, we reveal that the operating wavelength of the plasmonic switching can be extended to the telecom O- or E-band with an optimal ON/OFF ratio being 18.35 dB. Our results provide a path toward designing compact and tunable PIT device and could expand the application range of subwavelength nanostructures to the realm of optical communications and information process.
摘要：
Under ambient conditions or 160 & DEG;C, two supramolecular isomers, namely [(H(4)PTTA)(H2O)(2)(DMF)] and [(H(4)PTTA)(H2O)(3)]& BULL;& BULL;Guest (1-L and 1-H, H(4)PTTA = N-phenyl-N & PRIME;-phenyl bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxdiimide tetra-carboxylic acid, Guest = DMF and H2O), were obtained through the reaction of H(4)PTTA in a mixture of H2O and dimethylformamide. The single crystal structures reveal the temperature-dependent supramolecular isomerism derived from the torsion of semi-rigid of H(4)PTTA. The 1-L prepared at room temperature is a hydrogen bond based achiral layer, while the hydrothermal synthesized 1-H is isomer resulted in an H-bond-based chiral tubes-packed supramolecular framework.
期刊：
Journal of Alloys and Compounds,2021年873:159779 ISSN：0925-8388
通讯作者：
R. Ma
作者机构：
[Ma, R.; Huang, ZD.; Wang, L.] Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China.;[Xie, Q.; Ma, R.; Huang, ZD.] Guizhou Univ, Inst Adv Optoelect Mat & Technol, Guiyang 550025, Peoples R China.;[Zhou, J.] Univ South China, Coll Mech Engn, Hengyang 421001, Peoples R China.
通讯机构：
[R. Ma] C;College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China<&wdkj&>Institute of Advanced Optoelectronic Materials and Technology, Guizhou University, Guiyang 550025, China
关键词：
Fe3Si/PPy composites;First principles methods;Microwave absorption properties;Microwave loss mechanism
摘要：
Microstructures, electronic structures, and microwave absorption properties of Fe3Si/PPy composites have been investigated through experiments and first principal method. The calculated results show that Fe3Si/PPy composites are ferromagnets, and the total magnetic moment is 1.87(mu B). Charge transfer between atoms is conducive to dielectric loss. The Fe3Si/PPy composites were prepared with the one-pot method. The presence of Fe3Si and PPy was confirmed by XRD, FTIR, EDS and TEM. The Fe3Si/PPy composites showed good wave-absorbing ability in the X-band and Ku-band in contrast to pure Fe3Si. The RL value was -13.73 dB at 16.23 GHz in 1.5 mm-thick Fe3Si/PPy composites, indicating that only 10% EM waves are reflected and 90% EM waves were absorbed. The maximum RL value of the 5.0 mm-thick Fe3Si/PPy composites was -33.1 dB at 13.05 GHz. The effective bandwidth was 2.88 GHz. The dielectric loss and magnetic loss characteristics of the Fe3Si/PPy composites greatly contributed to their excellent wave absorption performance. (c) 2021 Elsevier B.V. All rights reserved.
摘要：
In this study, taking into account of the contribution of the centrifugal potential on half-life and the effect of electrostatic shielding, we modify the Gamow-like model proposed by Zdeb et al [2013 Phys. Rev. C 87, 024 308] to systematically investigate the cluster radioactivity half-lives of nuclei ranging from Fr-221 to U-238. The calculated results can reproduce the experimental data well. Additionally, this modified Gamow-like model is applied to predict the half-lives of cluster radioactivity nuclei whose experimental half-lives have the lower limit. It is found that the predicted results are in good agreement with the ones obtained by using the Gamow-like model and a Viola-Seaborg type formula.
