期刊：
Journal of the European Ceramic Society,2024年44(6):3747-3759 ISSN：0955-2219
通讯作者：
Sun, Junbin;Lu, WH
作者机构：
[Liu, Zhihua; Sun, Junbin; Lu, Weihong; Sun, JB; Ou, Jiani; Bin, Xing; Lu, WH] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Sun, Junbin; Lu, Weihong] Hengyang Normal Univ, Hunan Prov Key Lab Funct Met Organ Cpds, Hengyang 421008, Peoples R China.;[Sun, Junbin; Lu, Weihong] Hengyang Normal Univ, Coll Hunan Prov, Key Lab Organometall New Mat, Hengyang 421008, Peoples R China.;[Sun, Junbin; Lu, Weihong] Hengyang Normal Univ, Hunan Engn Res Ctr Monitoring & Treatment Heavy Me, Hengyang 421008, Peoples R China.
通讯机构：
[Sun, JB; Lu, WH ] H;Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.
关键词：
CeO2;CMAS corrosion
摘要：
Alumina based ceramic materials, such as LaMgAl11O19 (LMA) containing amounts of Al, usually resist the CMAS corrosion through forming a compact layer of the CaAl2Si2O8. In this work, the LMA/CeO2 mixed powders in mole ratios of 5:5 (L5C5), 7:3 (L7C3) and 9:1 (L9C1) were pressed and sintered to prepare the ceramic bulks. The resistance to CMAS corrosion of the LMA/CeO2, the CeO2 and the LMA ceramic bulks were tested and compared at 1250 degrees C and 1350 degrees C for 1 h, 5 h and 10 h. Results showed that the added CeO2 in the LMA can decrease the porosity and improve the resistance to CMAS corrosion. The combined effects of the LMA and CeO2 promoted the formation of the CaAl2Si2O8. The L5C5 and the L9C1 with appropriate composition have good resistance to CMAS corrosion at 1250 degrees C, and the L9C1 can alleviate CMAS infiltration compared with the LMA and other proportional materials at 1350 degrees C.
期刊：
Scripta Materialia,2024年242:115958 ISSN：1359-6462
通讯作者：
Huang, SJ;Wei, XL
作者机构：
[Huang, Shouji] Shaoyang Univ, Dept Phys, Shaoyang 422000, Peoples R China.;[Yang, Liwen] Xiangtan Univ, Sch Phys & Optoelect, Xiangtan 411105, Peoples R China.;[Wei, Xiaolin] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Xu, Guobao] Xiangtan Univ, Sch Mat Sci & Engn, Xiangtan 411105, Hunan, Peoples R China.
通讯机构：
[Huang, SJ ] S;[Wei, XL ] H;Shaoyang Univ, Dept Phys, Shaoyang 422000, Peoples R China.;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
关键词：
MnO quantum dots;Anode;Carbon aggregates;Li ion batteries
摘要：
We develop a facile strategy to construct massive MnO quantum dots of average size 3 nm embedded in quasispherical N-doped carbon aggregates as anodes for Li ion batteries (LIBs). The unique nanostructure supplies an elastic conductive carbon frame to alleviate volume expansion, ensures almost the entire surface of each MnO particle participate in electrochemical reactions, shortens ion diffusion length, and enhances electronic conductivity. Moreover, ex-situ TEM and HRTEM findings prove excellent reversibility and stability. Therefore, nanocomposite anode shows outstanding characteristics, including a high reversible capacity with 1052 mAh g- 1 at 0.3 A g-1 after 160 cycles, excellent rate capability with 407 mAh g-1 at 5 A g -1, and a prolonged cycling lifespan of 677 mAh g-1 at 2.0 A g-1 after 550 cycles with capacity retention of 113 %. In addition, Li full cell also show outstanding electrochemical performances by using LiFePO4 as cathode, and employing a nanocomposite as the anode.
摘要：
Recent research on text -guided image style transfer using CLIP (Contrastive Language -Image Pre -training) models has made good progress. Existing work does not rely on additional generative models, but it cannot guarantee the quality of the generated images, and often suffers from problems such as distortion of content images and uneven stylization of the generated images. To address such problems, this work proposes the TextStyler model, a CLIP -based approach for text -guided style transfer. In the TextStyler model, we propose a style transformation network STNet, which consists of an encoder and a multi -scale decoder. The network can capture the hierarchical features of the content image, and the decoder feature fusion module in the network, designed based on the channel attention mechanism, helps the network to maximize the retention of the detailed information of the content image while realizing texture transfer. In addition, we design a patch -wise perceptual loss, which is able to transfer the stylized texture to each local region of the image and improve the balance of model stylization. The experimental results show that the TextStyler model can achieve a wider range of style transfer than existing methods using stylized images, and the generated artistic images are more in line with human visual perception than state-of-the-art text -guided style transfer methods.
作者机构：
[Ting Lv; Meng Ge; Yang Zeng; Degao Xu; Gang Ouyang] Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, School of Physics and Electronics, Hunan Normal University , Changsha 410081, China;[Yipeng Zhao] College of Physics and Electronic Engineering, Hengyang Normal University , Hengyang 421008, China
通讯机构：
[Gang Ouyang] K;Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, School of Physics and Electronics, Hunan Normal University , Changsha 410081, China
摘要：
Designing direct Z-scheme heterostructure is an effective strategy to enhance redox ability, greatly raising the attention of photocatalysis in recent years. Here, we design 24 diverse vertical MS2/Si2PAs (M = Zr, Hf) heterostructures with different stacking configurations. Four kinds of heterostructures with different interlayer contacts are taken as examples to investigate the geometry, stability, and electronic properties, as well as the photocatalytic mechanism based on the first-principles calculations. We find that the competitiveness of MS2/Si2PAs (M = Zr, Hf) heterostructures is attributed to their excellent visible light absorption (∼2 × 105 cm−1), ultrafast carrier migration (∼13 587.28 cm2 V−1 s−1), and high solar-to-hydrogen efficiency (10.02%), indicating that this kind of system can be as a promising candidate in the field of semiconductor photocatalysis.
摘要：
Recently, both quartic self-similar pulses (QSSPs) and dissipative pure-quartic-solitons (DPQSs) pulses have been theoretically demonstrated in mode-locked fiber laser with pure positive fourth-order dispersion (FOD). Here, we investigate the existence regions and dynamics of those two soliton pulses by numerically solving the cubic-quintic Ginzburg-Landau equation. We find the positive FOD fiber laser tends to emit QSSPs in the presence of high nonlinear gain, while it is apt to generate DPQS pulses in the case of low nonlinear gain. An unstable pulse region separates the QSSP region from the DPQS region. The characteristics of QSSP and DPQS pulses are dependent on the nonlinear gain and FOD. The QSSP can carry more energy than that of DPQS pulse, because the DPQS pulse with large energy could be unstable due to the excessive pulse pedestal. Our results are not only useful for understanding the dynamics of the DPQS pulse and QSSP in the cubic-quintic Ginzburg-Landau equation with pure FOD, but also provide a guideline for generating high-energy pulses from the positive FOD fiber laser.
通讯机构：
[Zhang, DZ ] H;[Ma, J ] C;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421008, Peoples R China.;Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China.
摘要：
The plasma equilibrium plays a crucial role in nuclear fusion studies, serving as the foundation for various aspects of fusion research, including plasma stability, transport, and current drive. In this paper, a new Grad-Shafranov equation solver is developed for the fixed-boundary plasma equilibria with toroidal flow. This solver utilizes the pressure profile, safety factor profile (not current profile), and any two profiles of the toroidal angular velocity, plasma temperature, and square of the Mach number as inputs. The numerical results obtained by this solver exhibit good agreement with known analytic solution under identical parameters, and the potential applications of the solver are demonstrated through several numerical equilibria with toroidal flow. It is very convenient to apply this code to simulate the tokamak equilibrium with a smooth plasma shape. In addition, the effect of toroidal flow on the plasma equilibria is investigated as a simple application. The results reveal a notable outward shift in the contour profiles of magnetic flux surface, density, pressure, and temperature induced by toroidal flow.
摘要：
Organic deep-red fluorescent materials have a wide range of applications in organic light-emitting diodes (OLEDs), biological imaging, night-vision equipment, and other fields. Here, we designed and synthesized a new deep-red emissive donor-acceptor (D -A) compound TPANZPPICN, whose non-doped OLED achieves stable pure deep-red electroluminescence (EL) at 692 nm with a maximum external quantum efficiency (EQE) of 2.67 % in non-doped OLED and a maximum EQE of 7.96 % at 660 nm in doped OLED. Magneto-electroluminescence (MEL) measurements reveal a negative response in the doped OLED, which is a significant character of reversed intersystem crossing (RISC) on high-lying excited states. Both theoretical calculations and experimental results confirm that the hot-exciton mechanism is responsible for the high efficiency EL of doped OLED, which proves to be a novel approach to realize the efficient deep-red organic fluorescent OLEDs.
作者机构：
[Cai, Jin; Yao, Xintong; Yang, Bo; Luo, Shanshan] Hengyang Normal Univ, Sch Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Chen, Mansheng; Chen, MS] Hengyang Normal Univ, Key Lab Met Organ New Mat Coll Hunan Prov, Sch Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Chen, MS ] H;Hengyang Normal Univ, Key Lab Met Organ New Mat Coll Hunan Prov, Sch Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Hunan, Peoples R China.
摘要：
C16H24CoN4O8, triclinic, P1 (no. 2), alpha = 7.4371(8) & Aring;, b = 7.6451(9) & Aring;, c = 9.9156(12) & Aring;, alpha = 69.830(6)degrees, beta = 71.245(5)degrees, gamma = 79.653(5)degrees, V = 499.60(10) & Aring;(3), Z = 1, R-gt(F) = 0.0247, wR(ref)(F-2) = 0.0630, T = 293(2) K.
作者机构：
Authors to whom correspondence should be addressed.;Faisalabad Business School, National Textile University, Faisalabad 37610, Pakistan;School of Journalism and Communication, Hengyang Normal University, Hengyang 421010, China;[Muhammad Asif] School of Media, Hunan University of Science and Engineering, Yongzhou 425199, China;[Liu Yang] Authors to whom correspondence should be addressed.<&wdkj&>School of Journalism and Communication, Hengyang Normal University, Hengyang 421010, China
通讯机构：
[Liu Yang; Muhammad Hashim] A;Authors to whom correspondence should be addressed.<&wdkj&>Faisalabad Business School, National Textile University, Faisalabad 37610, Pakistan<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>School of Journalism and Communication, Hengyang Normal University, Hengyang 421010, China
摘要：
The Chinese manufacturing industry faces many challenges to sustainable development. This study examines how transformational leadership, corporate culture, and digital transformation affect Chinese manufacturing organizations’ sustainability. It will also examine the moderating role of environmental dynamism and the mediating effect of innovation capabilities. A self-administered survey was distributed to 350 manufacturing companies’ owners, managers, leaders, and employees, etc. Participants were selected via convenient sampling. This data collection effort validated findings and empirically tested theories. Smart PLS structural equation modelling (PLS-SEM), quantitative research, and cross-research are used in this study. The findings suggest that corporate culture, transformational leadership, and digital transformation significantly affect organizations’ sustainability. Innovation capability does not affect the relationship between corporate culture and sustainability. However, it mediates the relationship between transformational leadership, digital transformation, and business sustainability. Innovation capabilities and business sustainability performance are moderated by environmental dynamism. This study contributes to sustainable corporate performance theory by showing managers how transformational leadership, digital transformation, and corporate culture can help manufacturing companies grow indefinitely. The findings have major implications for China, a highly industrialized nation. This study could benefit regulatory authorities, academic institutions, industry, government agencies, and researchers.
摘要：
Developing novel photoelectric functional materials based on dithienylethenes (DTEs) building block has drawn increasing attention due to their excellent photochromic properties. In this contribution, two D-A type DTE derivatives 3 and 4 bearing triphenylamine (TPA) and anthraquinone (or anthracene) groups have been synthesized, and their structures have been characterized by means of NMR and MS. The UV-vis spectroscopy results show that compounds 3 and 4 exhibited reversible photochromism in toluene and THF solutions under UV/vis light irradiation, featuring good fatigue resistance and responsiveness. However, almost no photochromic properties for DTEs 3 and 4 were observed in larger polar DMSO. Interestingly, DTE 3 with obvious push-pull characteristics also displayed visible-light driven photochromic behavior in toluene. Meanwhile, fluorescence spectroscopy experiments have shown that DTE 4 with the anthracene fluorescent group showed fluorescent switching properties upon UV/vis light irradiation in toluene and THF solutions. The electrochemical results revealed a certain decrease in the half-wave potential of TPA-based 3 and 4 after UV irradiation, suggesting that the increasing conjugation degree of the ring-closed isomers results in the increase of HOMO orbital energy and the decrease of HOMO-LUMO gap and is beneficial for the occurrence of oxidation process, which are further proved by DFT calculations. TDDFT predicts that the transition absorption of the ring-closed isomers 3c and 4c respectively at 615 nm and 651 nm mainly come from pi-pi* mixed with TPA-*anthraquinone CT or TPA-*anthracene CT transition, which is consistent with the experimental results.
作者：
Huamei Zuo;Shixiang Zhan;Wangping Xu;Xiaolin Wei;Juexian Cao
期刊：
Sensors and Actuators B-Chemical,2024年409:135604 ISSN：0925-4005
通讯作者：
Wangping Xu<&wdkj&>Juexian Cao
作者机构：
Department of Physics & Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University, Xiangtan 411105, PR China;College of Physics and Electronics Engineering, Hengyang Normal University, Hengyang 421002, PR China;[Huamei Zuo; Shixiang Zhan; Wangping Xu; Juexian Cao] Department of Physics & Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University,Xiangtan 411105,PR China;[Xiaolin Wei] Department of Physics & Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University,Xiangtan 411105,PR China<&wdkj&>College of Physics and Electronics Engineering, Hengyang Normal University,Hengyang 421002,PR China
通讯机构：
[Wangping Xu; Juexian Cao] D;Department of Physics & Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University, Xiangtan 411105, PR China
摘要：
Screening sensitive materials is one of the keys to designing high-performance carbon nanotube-based field-effect transistor gas sensors. Here, we proposed a reliable way (e.g., H2S) to design sensitive materials with high efficiency based on theory and experiment. Our results demonstrated that the interaction between H2S and the sensitive materials must satisfy both energy level and parity match, and the maximum overlap of the orbital wave function. Especially, the gas ΔQ exhibits a strong linear scaling with the metal φ (ΔQ∝φ). Meanwhile, Δφ will result in changes in the threshold voltage of the sensor (ΔVth∝Δφ) in experiments, which would lead to different response intensities. Therefore, the greater the ΔQ, the more changes in the threshold voltage, and corresponding higher response intensity. Expectedly, our experimental results show that the response intensity at equivalent concentrations is in high agreement with the theory (Pt > Pd > Ag), and the limit of H2S detection is low to 20 ppb.
摘要：
Uncertainty analysis of evapotranspiration models is essential in hydrological modeling, particularly given the limited use of process-based models and ensemble algorithms for evapotranspiration estimation. In this study, the performance and uncertainty in two simplified process-based models (BTA and BTA-theta), and three classical ensemble algorithms (adaptive boosting, random forest, and extreme gradient boosting) in estimating evapotranspiration are assessed across various ecosystems. The results show that: (a) the BTA-theta model outperforms the BTA model across all ecosystems, and the integrated algorithms perform better than the two process-based models. (b) In the two process-based models, parameter k is insensitive to the outcomes, while parameters b, k1, and theta 1 are highly sensitive. (c) The primary source of uncertainty in the ensemble algorithms is parameterization, the structure of the BTA model, and the input data of the BTA-theta model. The findings provide valuable insights for increasing the evapotranspiration estimation accuracy and reliability. This study helps to improve the accuracy and reliability of evapotranspiration estimation in terrestrial ecosystems.
期刊：
Communications in Nonlinear Science and Numerical Simulation,2024年128:107602 ISSN：1007-5704
通讯作者：
Hu, LJ
作者机构：
[Hu, LJ; Hu, Lijun] Hengyang Normal Univ, Sch Math & Stat, Hengyang 421002, Hunan, Peoples R China.;[Wang, Xiaohui] Univ Texas Rio Grande Valley, Sch Math & Stat Sci, Edinburg, TX 78539 USA.
通讯机构：
[Hu, LJ ] H;Hengyang Normal Univ, Sch Math & Stat, Hengyang 421002, Hunan, Peoples R China.
关键词：
3D compressible flows;Roe scheme;Shock instability;Contact discontinuities;High accuracy
摘要：
The low-dissipation Roe scheme is a popular shock capturing scheme but the shock instability, such as the infamous carbuncle phenomenon, seriously affects its application in high Mach number flows. Although considerable research has been undertaken in two dimensions, mechanism analysis of the three-dimensional shock instability is relatively scarce. Numerical simulations of the Sedov blast wave indicate that the shock instability is more prominent in three dimensions, so it has theoretical and practical significance to analyze and heal the numerical instability. The mechanism for three-dimensional shock instability has been thoroughly studied by means of the linearized stability analysis and the dissipation-controlling approach which introduces the required transverse dissipation in the numerical shock layer and is adopted to enhance the Roe scheme's shock stability. Furthermore, the unphysical expansion shock resulting from the violation of entropy condition is eliminated by a simple modification of numerical signal speed. For the improvement of the resolution for contact discontinuities and shear waves, an algebraic method which combines the THINC reconstruction scheme and the BVD algorithm is employed to minimize the density difference in the numerical diffusion term. A series of benchmark numerical experiments fully demonstrate that the proposed scheme is endowed with excellent robustness against the shock instability and high accuracy for contact discontinuities and shear waves.
期刊：
Journal of Hazardous Materials,2024年470:134267 ISSN：0304-3894
通讯作者：
Peng, Bo
作者机构：
[Yang, Xia; Peng, Bo; Wu, Sicheng; Wu, Nengqiu] School of Geographic Sciences, Hunan Normal University, Changsha 410081, PR China;[Yang, Xia; Wu, Sicheng; Wu, Nengqiu] Key Laboratory of Environmental Heavy-Metal Contamination and Ecological Remediation, Hunan Normal University, Changsha 410081, PR China;[Peng, Bo] Key Laboratory of Environmental Heavy-Metal Contamination and Ecological Remediation, Hunan Normal University, Changsha 410081, PR China. Electronic address: pengbo@hunnu.edu.cn;[Xie, Shurong] School of Earth Sciences, East China University of Technology, Nanchang 330013, PR China;[Fang, Xiaohong] College of Geography and Tourism, Hengyang Normal University, Hengyang 421002, PR China
通讯机构：
[Peng, Bo] K;Key Laboratory of Environmental Heavy-Metal Contamination and Ecological Remediation, Hunan Normal University, Changsha 410081, PR China. Electronic address:
关键词：
Black shale weathering;Carbonaceous black shale;Cd release mass flux;Environmental impact;Mobility of Cd during weathering
摘要：
Carbonaceous black shale generally contains high concentration of Cd, with weathering leading to Cd release to environment. In this study, the mobility of Cd during weathering was quantified using geochemical assessment on black shale from western Hunan, China. Results suggested that Cd was heterogeneously distributed in shale profiles with concentrations ranging from 0.16 to 109.9 (mg/kg). Cd distribution was heterogeneous resulting from the parent shale inheritance and the mobility of Cd during weathering. Black shales weathered to a moderate degree with Cd mobility characterized by both enrichment in and release from weathered shales. Cd enrichment in weathered shales resulted from the re-enrichment of Cd in secondary minerals formed during the initial stage of carbonate (and phosphorite) dissolution, and the secondary stage of sulfide oxidation. The release of Cd was caused by decomposition of the secondary Cd-bearing minerals. Cadmium was extensively released during pedogenesis, and Cd release mass flux was estimated to range from 1.26 to 9.50 (g/m(2)) with a mean of 6.60g/m(2). Thus, black shale weathering may lead to the releasing of large amount of Cd resulting in Cd contamination to local environments.
作者：
Kuang, Juanli*;Cao, Xiawei;Li, Songxiao;Li, Lang
期刊：
Journal of King Saud University - Computer and Information Sciences,2024年36(1) ISSN：1319-1578
通讯作者：
Kuang, Juanli;Li, L
作者机构：
[Kuang, Juanli] Macau Univ Sci & Technol, Fac Innovat Engn, Macau 999078, Peoples R China.;[Kuang, Juanli; Li, Lang] Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang 421002, Peoples R China.;[Cao, Xiawei; Kuang, Juanli; Li, Lang] Applicat Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc, Hengyang 421002, Peoples R China.;[Li, Songxiao] Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Sichuan, Peoples R China.
通讯机构：
[Kuang, JL; Li, L ] H;Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang 421002, Peoples R China.
关键词：
Internet of Things;Block cipher;Lightweight cryptography;GFN;Pseudo -random;Negative feedback mechanism
摘要：
The Internet of Things (IoT) has gained popularity in various fields, including components such as embedded devices and wireless sensors. However, ensuring the security of data transmission from these devices is of critical importance. In light of these challenges, a novel lightweight encryption method called DRcipher is proposed in this paper for resource-constrained IoT devices. DRcipher has a 64-bit block size and supports either 96-bit or 128-bit key sizes. In order to improve the security, DRcipher employs a pseudo-random number of encryption rounds determined by the primary key. DRcipher adopts the structure of Generalized Feistel Network (GFN) with 4 branches, and its round functions consist of F-function, FF-function and RP permutation components. In particular, there is a negative feedback mechanism between the FF-function and the overall round of encryption functions. In addition, DRcipher is synthesised using Synopsys Design Compiler version A-2007.12-SP1 and the UMCL18G212T3 standard cell library. DRcipher-96 has an area footprint of 1546 Gate Equivalents (GE), while DRcipher-128 has a slightly larger area footprint of 1646 GE. Moreover, a comprehensive security analysis shows that the proposed DRcipher ensures high-level security redundancy against differential cryptanalysis, linear cryptanalysis, and so on.
