作者机构：
[Long, Yun; Bao, Yude] Guangdong Power Grid Co Ltd, Guangzhou Power Supply Bur, Guangzhou 510260, Peoples R China.;[Zeng, Linjun] Changsha Univ Sci & Technol, Sch Energy & Power Engn, Changsha, Peoples R China.
通讯机构：
[Zeng, LJ ] C;Changsha Univ Sci & Technol, Sch Energy & Power Engn, Changsha, Peoples R China.
关键词：
power monitoring system;cloud-edge-device collaboration;large-scale digital substation;edge computing;intelligent patrol;intelligent operation;decision fusion
摘要：
With the continuous promotion of digital transformation in the field of power transformation, the diversification of application scenarios, and the scale of pilot construction, the real-time, concurrency, and security requirements for data fusion and application support of the power monitoring system, management information system, and other business platforms are getting higher and higher, and this paper puts forward a high concurrency and availability "cloud-side-end collaboration" based on edge computing. This paper proposes a high concurrency and availability "cloud, edge and end collaboration" architecture based on edge computing for substation operation support systems. First, this paper summarizes the development status of domestic substation operation support systems and analyzes the advantages and disadvantages of various technical architectures. Then, a "cloud-side-end cooperative" substation operation support system architecture with "high real-time, high concurrency, high security and high stability" is proposed, which focuses on remote inspection, remote operation, and remote safety control of substation businesses from the perspective of engineering applications. It realizes transparent monitoring of equipment operation, unified management of operation data, and integration of production command and decision-making; solves the problems of dispersed coexistence of multiple systems for dispatching, monitoring, analysis, management, and other businesses, switching between multiple systems, and insufficient real-time and stability of the system; and controls the risks of the grid, reduces the potential safety hazards, and solves the contradiction between the continuous growth of the grid equipment and the shortage of production personnel. The results of engineering application examples show that the proposed architecture compared with the existing system architecture has greater advantages and can meet the requirements of large-scale access to the substation, with feasible popularization and application.
期刊：
Journal of Applied Toxicology,2024年 ISSN：0260-437X
通讯作者：
Liu, Zhonghua;Wang, Y
作者机构：
[Shu, Yuanyuan; Liu, Zhonghua; Ning, Chao; Wang, Jiaxu; Li, Yaqi; Wang, Ying; Liang, Songping; Zhou, Yini] Hunan Normal Univ, Coll Life Sci, Natl & Local Joint Engn Lab Anim Peptide Drug Dev, Changsha 410006, Hunan, Peoples R China.;[Shu, Yuanyuan; Ning, Chao; Wang, Jiaxu; Liu, Zhonghua; Li, Yaqi; Wang, Ying; Liang, Songping; Zhou, Yini] Hunan Normal Univ, Inst Interdisciplinary Studies, Changsha, Peoples R China.;[Shu, Yuanyuan; Ning, Chao; Wang, Jiaxu; Liu, Zhonghua; Li, Yaqi; Wang, Ying; Liang, Songping; Zhou, Yini] Hunan Normal Univ, Furong Lab, Peptide & small Mol drug R&D platform, Changsha, Peoples R China.;[Tan, Yijun] Changsha Univ Sci & Technol, Sch Comp & Commun Engn, Changsha, Peoples R China.
通讯机构：
[Liu, ZH; Wang, Y ] H;Hunan Normal Univ, Coll Life Sci, Natl & Local Joint Engn Lab Anim Peptide Drug Dev, Changsha 410006, Hunan, Peoples R China.
摘要：
Machine learning (ML) has shown a great promise in predicting toxicity of small molecules. However, the availability of data for such predictions is often limited. Because of the unsatisfactory performance of models trained on a single toxicity endpoint, we collected toxic small molecules with multiple toxicity endpoints from previous study. The dataset comprises 27 toxic endpoints categorized into seven toxicity classes, namely, carcinogenicity and mutagenicity, acute oral toxicity, respiratory toxicity, irritation and corrosion, cardiotoxicity, CYP450, and endocrine disruption. In addition, a binary classification Common-Toxicity task was added based on the aforementioned dataset. To improve the performance of the models, we added marketed drugs as negative samples. This study presents a toxicity predictive model, ToxMPNN, based on the message passing neural network (MPNN) architecture, aiming to predict the toxicity of small molecules. The results demonstrate that ToxMPNN outperforms other models in capturing toxic features within the molecular structure, resulting in more precise predictions with the ROC_AUC testing score of 0.886 for the Toxicity_drug dataset. Furthermore, it was observed that adding marketed drugs as negative samples not only improves the predictive performance of the binary classification Common-Toxicity task but also enhances the stability of the model prediction. It shows that the graph-based deep learning (DL) algorithms in this study can be used as a trustworthy and effective tool to assess small molecule toxicity in the development of new drugs. Machine learning has shown great promise in predicting toxicity of small molecules. This study presents a toxicity predictive model, ToxMPNN, based on the message passing neural network architecture, aiming to predict the toxicity of small molecules. ToxMPNN gives precise predictions with the ROC_AUC testing score of 0.886 for the Toxicity_drug dataset, which contains 27 toxic endpoints in seven toxicity categories and a binary classification Common-Toxicity task, and can be used as an effective tool to predict the toxicity of small molecules.
摘要：
Considerable photovoltaic (PV) panels are installed on building roof, which are exposed to lightning strike at a high risk. Lightning electromagnetic (EM) field will induce a high voltage, which can damage the electronic devices of PV system. By using the method of moments, the EM coupling among the lightning channel and roof structure is modeled, and the induced voltage of PV array is calculated. The influences of building structure, roof material, and shape are discussed. The induced voltage is strongly dependent on the induced current on rooftop generated by the lightning EM field. Since the induced current produces an opposite magnetic field, it weakens the original lightning magnetic field and the presence of roof can lower the induced voltage. Occasionally, the induced voltage becomes higher for the roof with many crossbars and supporting legs, especially for the metal rooftop. The voltage rises as the roof height increases. Compared to the sloped roof, the distance between the flat roof and PV array is greater, and the effect of roof is relatively minor. To reduce the induced voltage, the arrangement of PV panels is investigated. The results can provide guidance for lightning protection design of rooftop PV system.
作者：
Zhao, Wensheng;Fang, Guotao;Qin, Xiao;Mao, Jie
期刊：
REVIEWS ON ADVANCED MATERIALS SCIENCE,2024年63(1):- ISSN：1606-5131
通讯作者：
Qin, X
作者机构：
[Zhao, Wensheng] Changsha Univ Sci & Technol, Natl Engn Res Ctr Highway Maintenance Technol, Changsha 410114, Peoples R China.;[Qin, Xiao; Qin, X] Foshan Univ, Sch Transportat & Civil Engn & Architecture, Foshan 528000, Peoples R China.;[Zhao, Wensheng] Changsha Univ Sci & Technol, Sch Traff & Transportat Engn, Changsha 410114, Peoples R China.;[Fang, Guotao] Guangzhou HuaHui Traff Technol Co Ltd, Guangzhou 510335, Peoples R China.;[Mao, Jie] Guangdong GuanYue Highway & Bridge Co Ltd, Engn Dept, Guangzhou 511450, Peoples R China.
通讯机构：
[Qin, X ] F;Foshan Univ, Sch Transportat & Civil Engn & Architecture, Foshan 528000, Peoples R China.
关键词：
asphalt;UV aging;characterization
摘要：
To clarify the effect and mechanism of hindered amine light stabilizer (HALS) on the UV aging behavior of asphalt binder, T622-HALS was selected as the modifier for UV aging resistance of asphalt. The physicochemical properties and microstructure of T622 light stabilizer were comprehensively analyzed. The light stabilizer-modified asphalt was prepared and placed in the UV radiation chamber for UV aging treatment. Scanning electron microscope and atomic force microscope were used to analyze the microscopic morphology evolution of light stabilizer-modified asphalt induced by UV radiation. The thermal properties and functional group composition changes in light stabilizer-modified asphalt during UV aging were studied by using the thermogravimetric and infrared spectroscopy combined testing system. The decay laws of the physical and rheological performances of light stabilizer-modified asphalt were studied during UV aging process, and the effect of light stabilizer on the UV aging behavior of asphalt binder was clarified. The research results indicated that HALSs could alleviate the microcracks and roughness change on the surface of asphalt and reduce the content of functional groups such as carbonyl and sulfoxide in asphalt. Furthermore, HALS could reduce the value difference of physical and rheological properties of asphalt before and after UV aging, significantly improving the UV aging resistance of asphalt binder.
摘要：
Fatigue cracking in welded joints is a critical problem in bridge engineering, especially for aging long -span steel bridges. The crack size and density are increasing gradually with the bridge aging process, where the crack interaction will accelerate the crack propagation or even short cracks merging into a long crack. However, the mechanism underlying the coupled propagation behavior of multiple cracks remains unclear. In this study, the coupling effect of multiple cracks was investigated based on numerical simulations. Subsequently, the numerical result was verified by a full-scale segmental fatigue experiment. In order to overcome the time-consuming iterative computations, the back propagation (BP) neural network was utilized to predict the effective coupling spacing between multiple cracks. Finally, a new crack reconstruction method was proposed to simplify crack merging processes. Results indicate that the coupled propagation behavior is significantly impacted by the effective crack spacing. The coupling effect is more significant at the near -end point compared to other feature points. In addition, the cracks with similar sizes have greater coupled effect, which is the worst -case scenario for the multiple fatigue crack problem. The experimental study demonstrates that the growth rate of the near -end point is 1.53 times that of the far -end point and pre -made cracks merge together successfully. By utilizing the BP neural network, the relative error of predicted effective spacing of two cracks is 3.52%. Compared to existing design specifications, the new reconstruction method provides a more reliable result for the fatigue life prediction of the welding seam with multiple fatigue cracks.
关键词：
Organic amine pesticides (OAPs);Surface water;Sediments;Drinking water source;Risk assessment
摘要：
The extensive use of organic amine pesticides (OAPs) in agricultural practices has resulted in the contamination of water environments, posing threats to ecosystems and human health. This study focused on the Xiang River (XR), a representative drinking water source, as the research area to investigate the occurrence characteristics of 34 OAPs. Diphenylamine emerged as the most prevalent OAP in surface water due to industrial and agricultural activities, while cycloate dominated in sediments due to cumulative effects. Generally, the concentration of OAPs in a mixed tap water sample was lower than those in surface water samples, indicating OAPs can be removed by water plants to a certain extent. The water-sediment distribution coefficients (k(d)) of ΣOAPs were much less than 1 L/g, the majority of OAPs maintained relatively high concentrations in water samples instead of accumulating in sediments. Furthermore, risk assessment revealed that carbofuran showed a moderate risk to the aquatic environment, with a risk quotient of 0.23, while other OAPs presented minor risks. This study provided crucial insights for regional pesticide management and control in the XR basin, emphasizing the importance of implementing strategies to minimize the release of OAPs into the environment and protect human health.
期刊：
Results in Physics,2024年56:107253 ISSN：2211-3797
通讯作者：
Zhang, QH
作者机构：
[Zhang, Qing-Hua; Zhang, QH] Changsha Univ Sci & Technol, Sch Math & Stat, Changsha 410114, Peoples R China.;[Lai, Lemin] Chinese Acad Sci, Acad Math & Syst Sci, Beijing 100190, Peoples R China.;[Lai, Lemin] Univ Chinese Acad Sci, Sch Math Sci, Beijing 100049, Peoples R China.;[Fei, Shao-Ming] Capital Normal Univ, Sch Math Sci, Beijing 100048, Peoples R China.;[Fei, Shao-Ming] Max Planck Inst Math Sci, D-04103 Leipzig, Germany.
通讯机构：
[Zhang, QH ] C;Changsha Univ Sci & Technol, Sch Math & Stat, Changsha 410114, Peoples R China.
关键词：
Steering criteria;Correlation matrices;Special unitary groups
摘要：
We study the steerability for arbitrary dimensional bipartite systems based on the correlation matrices given by local special unitary groups. We present families of steering criteria for bipartite quantum states in terms of parameterized correlation matrices. We show that these steering criteria may detect more steerable states than the existing steering criteria. The results are illustrated by detailed examples.
作者机构：
[Meng, Ruizhi; Cui, Zhexin; Yun, Di] Xi An Jiao Tong Univ, Sch Nucl Sci & Technol, Xian 710049, Peoples R China.;[Cui, Zhexin; Lozano-Perez, Sergio] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England.;[Liu, Junkai] Xidian Univ, Sch Adv Mat & Nanotechnol, Xian 710126, Peoples R China.;[Deng, Huiqiu; Liu, Guangdong; Deng, HQ] Hunan Univ, Sch Phys & Elect, Changsha 410082, Peoples R China.;[Liu, Xiaochun; Tang, Guogao] Changsha Univ Sci & technol, Inst Met, Coll Mat Sci & Engn, Changsha 410082, Peoples R China.
通讯机构：
[Yun, D ] X;[Deng, HQ ] H;Xi An Jiao Tong Univ, Sch Nucl Sci & Technol, Xian 710049, Peoples R China.;Hunan Univ, Sch Phys & Elect, Changsha 410082, Peoples R China.
关键词：
Zirconium alloy;High-temperature oxidation;Effect of tin;Nanovoids
摘要：
The oxidation behavior of zirconium alloy in high-temperature steam plays a dominant role in the operation of nuclear reactors under accident conditions. The present work investigated the effect of Sn on the oxidation behavior of zirconium alloys in high-temperature steam at 1000 degrees C. The results of scanning electron microscopy (SEM), metallographic microscopy and synchrotron X-ray diffraction (S-XRD) analyses show that there are three layers in the oxidized sample, including prior beta-Zr, alpha-Zr(O) and ZrO2. High resolution analyses conducted in these layers by transmission electron microscopy (TEM) show that Sn atoms segregate around the oxide-metal (O-M interface and Zr-Sn intermetallic precipitates only present in the oxide film. Clear atomic arrangements of Zr5Sn3 were obtained by TEM, resulting in accurate identification of the Zr-Sn intermetallic phase. Also, TEM energy dispersive spectroscopy (EDS) maps show that Zr-Sn particles invariably accompany the segregation or precipitation of Nb. However, no clear precipitation sequence was observed, which suggests that a co-precipitation mechanism of Sn and Nb is in operation. As oxidation proceeds, nanovoids next to the Zr-Sn intermetallic particles were observed accompanied by local areas deficient in oxygen, identified as ZrO. Combining the interdiffusion trend obtained by Density functional theory (DFT) and ab initio molecular dynamics (AIMD) simulations, a mechanism for the transformation from the Zr-Sn intermetallic precipitates to nanovoids was proposed. This proposed mechanism may shed new light into the role of Sn in the oxidation resistance of zirconium alloy under LOCA conditions.
作者机构：
[Xinsheng Wang; Jifeng Luo; Shizhong Wei] Hennan Key Laboratory of Intelligent Manufacturing of Mechanical Equipment, Zhengzhou University of Light Industry, Zhengzhou, 430002, China;[Yang Li; Yueyang Yu] National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die & Mould, Tianjin University of Technology and Education, Tianjin, 300222, China;[Yonggang Tong] College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha, 410114, China;[Honglin Mou; Zhihai Cai; Zhiguo Xing] National Engineering Research Center for Remanufacturing Academy of Armored Forces Engineering, Beijing, 100072, China
通讯机构：
[Zhihai Cai] N;National Engineering Research Center for Remanufacturing Academy of Armored Forces Engineering, Beijing, 100072, China
摘要：
Titanium alloy is an essential material for preparing aerospace engines because of its excellent performance. However, the poor wear resistance of titanium alloy restricts its further development as a critical engine material. This study aimed to use laser cladding and particle enhancement technologies to enhance the surface wear resistance of titanium alloy. (NiCoCr)94Al3Ti3+hBN, (NiCoCr)94Al3Ti3+cBN, and (NiCoCr)94Al3Ti3+hBN + cBN were prepared on the surface of titanium alloy, and the wear resistance mechanism of single-phase self-lubricating particles, single-phase hard particles, and self-lubricating and hard biphasic particles was investigated. The results showed that the microhardness of the biphase-reinforced coating was 1083.8 HV0.5, which was higher than that of the self-lubricating particle-reinforced coating and hard-particle-reinforced coating by 368.4 HV0.5 and 149.8 HV0.5, respectively. The friction coefficient of the biphase-reinforced coating was 0.4208, which was lower than that of the self-lubricating particle-reinforced coating and hard-particle-reinforced coating by 0.0224 and 0.0686, respectively. The wear rate of the biphase-reinforced coating was 0.076 mm3/NM, and the wear resistance of the biphase-reinforced coating was 3.42 and 1.37 times that of the self-lubricating particle-reinforced coating and hard-particle-reinforced coating, respectively. hBN relied on its own decomposition to promote the coating to present a layered unstable structure to achieve a wear reduction effect, cBN relied on its own hardness to resist wear and played a wear-resistant role, whereas biphase-reinforced coating had a hard wear resistance and formed a lubricating film to enhance the wear resistance of the coating. The comprehensive performance of the dual-phase wear-resistant coating reinforced by hard particles and self-lubricating particles was better than that of single-phase wear-resistant coating, providing a reference for developing wear-resistant coating integrating hardness and self-lubrication.
摘要：
It is believed that local activation is the origin of all complexities, and the locally active memristive synaptic neural network can generate complex chaotic dynamic behaviors, such as hyperchaotic, multi-scroll, multi-stability and hidden dynamical behaviors. However, there are few studies on the simultaneous occurrence of multiple complex dynamic behaviors in neural networks. No chaotic system of multi-scroll hyperchaotic hidden attractors based on neural network has been found yet. To solve the problem, in this paper, we propose a new locally active memristive Hopfield neural network (HNN) model based on a multi-segment function, which is affected by electromagnetic radiation and external current. The multi-scroll hyperchaotic hidden attractors are found in the memristive HNN for the first time. Theoretical analysis and numerical simulation results show that the memristive HNN model has no equilibrium point, and the number of multi-scroll attractors is controlled by the state equation parameters of the memristive synapse. In addition, the structures and number of scrolls are also affected by electromagnetic radiation and external current. At the same time, under the appropriate parameter conditions, by modifying the initial value of the system, the memristive HNN has a controllable number of coexisting attractors, showing extreme multi-stability. Finally, a memristive HNN analog circuit is designed. The hardware experiment results reproduce the multi-scroll dynamics phenomenon, which verifies the correctness of the theoretical analysis and numerical simulation.
期刊：
Journal of Alloys and Compounds,2024年976:173160 ISSN：0925-8388
通讯作者：
Ouyang, LZ;Zhang, JR
作者机构：
[Qin, Chenglei; Zhong, Hao; Wang, Hui; Ouyang, Liuzhang; Liu, Jiangwen] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China.;[Qin, Chenglei; Zhong, Hao; Wang, Hui; Ouyang, Liuzhang; Liu, Jiangwen] South China Univ Technol, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China.;[Zhong, Hao] Guangzhou High Tech Zone Inst Energy Technol, Guangzhou 510000, Peoples R China.;[Chen, Kang] Changsha Univ Sci & Technol, Sch Energy & Power Engn, Key Lab Efficient & Clean Energy Utilizat, Changsha 410111, Peoples R China.;[Lang, Chengguang] Sun Yat sen Univ Shenzhen, Sch Adv Energy, Shenzhen 518107, Peoples R China.
通讯机构：
[Zhang, JR ] L;[Ouyang, LZ ] S;South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China.;South China Univ Technol, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China.;Lishui Univ, Dept Chem, Lishui 323000, Peoples R China.
摘要：
Onsite hydrogen generation by sodium borohydride hydrolysis resolves hydrogen energy supply system challenges. However, the spent-NaBH4 regeneration is still a problem in the closed loop of this irreversible reaction. As the by-product is the key to the problem, NaB(OH)4 is regarded as not the boron source but the hydrogen source of NaBH4 regeneration. Therefore, in this study, inexpensive Al metal and NaB(OH)4 are ball milled under argon to regenerate NaBH4 without additional hydrogen input. However, the ball-milling reaction is hindered by the flexible Al and impact oxide layer, and the NaBH4 yield is only approximately 22 %. Therefore, a brittle intermetallic compound Mg2Al3 is reacted with NaB(OH)4 by ball milling, achieving a NaBH4 yield of over 42 %. The mechanism study shows that the brittleness of the raw material plays an important role in promoting the ball-milling reaction. This study achieves NaBH4 regeneration using only Al as the reducing agent and provides a promising method to promote the mechanochemical regeneration of NaBH4.
