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SSRN 2023年

作者： Cao, Guohui Deng, Lu Liu, Rui Liao, Shijie Zhang, Wang Zhang, Zaihua Liu, Jin Hunan Engineering Research Center of Development Application of Ceramsite Concrete Technology Hunan City University Yingbin East RD Hunan Yiyang413000 China Key Laboratory for Damage Diagnosis of Engineering Structures of Hunan Province Hunan University Changsha410082 China School of Civil Engineering University of South China Hengyang421200 China School of Civil Engineering Changsha University of Science & Technology Changsha410114 China School of Infrastructure Engineering Dalian University of Technology Dalian116024 China

Freeze–thaw cycling and carbonation tests were conducted on four different compressive strengths of lightweight shale ceramsite concrete (LSCC) to investigate the durability of this type of concrete. The frost resistance of LSCC was comprehensively analyzed and evaluated based on its appearance, relative mass, compressive strength, and relative dynamic elastic modulus. Carbonation depth was explored, and carbonation resistance was evaluated. Results showed that the frost and carbonization resistance of LSCC increased with the increase in strength grade. After 200 freeze–thaw cycles, the mass, relative dynamic modulus, and compressive strength losses of LSCC45 ceramsite concrete were 32.7%, 70.6%, and 39.9% of those of LSCC20, respectively. In terms of carbonation performance, after 28 days, the carbonation depth of LSCC45 aggregate concrete was only 43.9% of that of LSCC20. Compared with ordinary concrete, LSCC exhibited superior frost resistance because of its insulation properties, pozzolanic activity, and self-curing effect that enhanced the internal filling within the concrete. Furthermore, compared with ordinary concrete, LSCC showed better carbonization resistance because of its porosity and high water absorption capability;it absorbed a large amount of water and CO2 at the early stage of carbonization and lowered the carbonization rate. Additionally, on the basis of the functional relationship between relative dynamic modulus of elasticity and number of freeze–thaw cycles, experimental carbonation data for LSCC, and standard values for cube compressive strength, freeze–thaw damage and carbonation depth prediction models were separately established in this study. The models effectively reflected the patterns of freeze–thaw damage and carbonation in LSCC with different strength grades. © 2023, The Authors. All rights reserved.

关键词： Carbonation

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Prediction of Distributed Photovoltaic Users' Electric Energy Data Based on BP Neural Network Algorithm

Prediction of Distributed Photovoltaic Users' Electric Energ...

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IEEE International Conference on Power and Energy Systems (ICPES)

作者： Yu Xiao Xing He Rui Huang Yuping Su Suihan Zhang Mouhai Liu Wenwei Zeng Ruixian Wang State Grid Hunan Electric Power Company Limited Changsha China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology State Grid Hunan Electric Power Company Limited Changsha China School of Electrical and Information Engineering Changsha University of Science and Technology Changsha China

In this paper, a BP neural network (BPN) algorithm model is utilized to forecast the electric energy data of distributed photovoltaic (PV) users. One month's forward active power and voltage data of PV users are collected. The data was collected every hour. So, 24 data were collected every day. Then a BPN algorithm training model are established, First 20 of the days were considered for training data and final 10 days were considered for testing data. Through simulation experiment, the graph of predicted value and actual value of the forward active power and voltage of distributed PV users are obtained. It is concluded that the BPN algorithm model is an accurate model in predicting PV users' data, and the model is more accurate in predicting voltage than in predicting forward active power. The BPN algorithm model could be an effective model for a short-term forecasting of local small distributed PV station output, and has certain significance for the power management department to formulate energy management and dispatching schemes for stability and safekeeping on large grid after PV grid connection.

关键词： Photovoltaic systems Power system management Neural networks Voltage Predictive models Power system stability Prediction algorithms

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Decentralized and Lightweight Cross-Chain Transaction Scheme Based on Proxy Re-signature

Decentralized and Lightweight Cross-Chain Transaction Scheme...

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IEEE International Conference on Trust, Security and Privacy in Computing and Communications (TrustCom)

作者： Huiying Zou Jia Duan Xi Liu Wei Ren Tao Li Xianghan Zheng Kim-Kwang Raymond Choo School of Computer Science China University of Geosciences Wuhan China The Third Surveying and Mapping Institute of Hunan Province Hunan Engineering Research Center of Geographic Information Security and Application Hunan China Key Laboratory of Data Protection and Intelligent Management Sichuan University Ministry of Education China State Key Laboratory of Geo-Information Engineering and Key Laboratory of Surveying and Mapping Science and Geospatial Information Technology of MNR CASM Beijing China College of Computer and Big Data Fuzhou University School of Information and Intelligent Engineering Sanya College China Department of Information Systems and Cyber Security University of Texas at San Antonio San Antonio USA

ISBN: (数字)9798331506209

ISBN: (纸本)9798331506216

With the widespread application of digital assets and the rapid development of blockchain technology, achieving secure and efficient transactions between different blockchain networks has become an urgent challenge. Existing cross-chain methods impose limitations, e.g., hash lock technology exhibits low scalability, side-chain technology is overly complex, and notary schemes pose centralization risks. In order to address these issues, we propose a cross-chain transaction solution based on proxy re-signature technology. To tackle the centralization concerns, we employ proxy re-signature technology to decentralize the authority of notaries among transaction participants, minimizing the potential for centralization at a low cost. We further present an extended scheme that can guarantee more requirements such as higher transaction amount and shorter transaction time. Furthermore, we analyze and compare the signature technologies used in the proposed solution and provide a systematic proof of our approach’s security.

关键词： Privacy Systematics Costs Scalability Blockchains Security

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Distance measurement technology of transmission line tree based on satellite remote sensing image

Distance measurement technology of transmission line tree ba...

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Electrical Engineering and Control Science (IC2ECS), International Conference on

作者： Xiaoguang Qiao Lanlan Liu Wen Li Yao Xiao Wusheng Quan Live Inspection and Intelligent Operation Technology State Grid Corporation Laboratory (State Grid Hunan Extra High Voltage Transmission Company) Hengyang China Hunan Province Key Laboratory of Intelligent Live Working Technology and Equipment (Robot) Hengyang China State Grid Hunan Extra High Voltage Transmission Company Hengyang China

In the channel control of transmission lines, the distance between the conductor and the trees and bamboos below is the object that needs to be paid attention to. If the distance is too small, it will cause the line to trip and fail. The existing line tree distance measurement is mainly carried out manually, the task is heavy and the result is easily disturbed by various influences. In order to realize the fast and efficient measurement of the line-tree distance, this paper relies on the principle of photogrammetry to match the point cloud information along the transmission line from the satellite remote sensing image, and uses the supervised classification method to identify and extract the spatial parameters of the tree canopy area, and uses the suspension of the transmission line to obtain the point cloud information. The chain-line equation obtains the spatial parameters of the transmission line, thereby realizing the measurement of the line-tree distance. According to the actual measurement of the line, the average measurement error of the method proposed in this paper is 6.09%, and the maximum error is 15.80%, which meets the accuracy requirements for large-scale measurement and analysis along the transmission line.

关键词： Point cloud compression Measurement errors Power transmission lines Satellites Measurement uncertainty Vegetation Transmission line measurements

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Red carbon dots as label-free two-photon fluorescent nanoprobes for imaging of formaldehyde in living cells and zebrafishes

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Chinese Chemical Letters 2020年第3期31卷 759-763页

作者： Hong Wang Jing Wei Chonghua Zhang Yuan Zhang Yubin Zhang Lin Li Changmin Yu Peisheng Zhang Jian Chen Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education Hunan Provincial Key Laboratory of Controllable Preparationand Functional Application of Fine PolymersHunan Provincial Key Lab of Advanced Materials for New Energy Storage and ConversionHunan Province College KeyLaboratory of QSAR/QSPRSchool of Chemistry and Chemical EngineeringHunan University of Science and TechnologyXiangtan 411201China Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech UniversityNanjing 211800China State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640China

Direct,in situ selective detection of intracellular formaldehyde(FA)is of great significance for understanding its function in FA-related ***,red carbon dots(RCD)are reported as label-free two-photon fluorescent nanoprobes for detecting and imaging of *** addition of FA,the-NH2 groups of RCD could quickly and specially react with aldehydes to form Schiff base and then the strong fluorescence of RCD with blue-shift emission is recovery due to the destruction of the hydrogen bond interaction between RCD and *** addition,the nanoprobes exhibit outsta nding photo stability,rapid response(<1 min),high sensitivity(~9.9μmol/L)and excellent selectivity toward FA over other aldehyde group ***,owing to the good cell-membrane permeability and biocompatibility,as well as the large two-photon absorption cross-section,the as-prepared RCD can be used as label-free nanoprobes for selectively detecting and imaging FA in living cells and zebrafishes through one-photon and two-photon ***,RCD could stain the tissue of zebrafishes at depths interval of up to 240μm under two-photon *** research implied that RCD are promising tools for directly and in situ imaging FA in vivo,thus providing critical insights into FA-related pathophysiological processes.

关键词： Carbon dots(CDs) Two-photon excitation Formaldehyde(FA) Intracellular imaging Zebrafishes

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Geological disaster monitoring technology along transmission line based on InSAR

Geological disaster monitoring technology along transmission...

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Electrical Engineering and Control Science (IC2ECS), International Conference on

作者： Jian Zhang Bocheng Li Jun Chen Chuyu Cai Xiaolong Li Live Inspection and Intelligent Operation Technology State Grid Corporation Laboratory (State Grid Hunan Extra High Voltage Transmission Company) Hengyang China Hunan Province Key Laboratory of Intelligent Live Working Technology and Equipment (Robot) Hengyang China State Grid Hunan Extra High Voltage Transmission Company Hengyang China

Transmission lines are widely distributed in mountainous areas, hills and other areas, and geological subsidence caused by natural disasters or man-made destruction poses a great threat to the safety of transmission line towers. In order to realize accurate and efficient monitoring of geological hazards along the transmission line, this paper analyzes the technical principle of InSAR (Interferometric Synthetic Aperture Radar), and puts forward a complete monitoring process based on the characteristics of the transmission line. Using the above method to analyze satellite data for 17 consecutive months along a certain line, 105 hidden danger points were identified through analysis. After on-site verification, the geological subsidence of the hidden danger points is true, which provides a new way for the monitoring of geological disasters along the transmission line.

关键词： Electrical engineering Power transmission lines Satellites Deformation Geology Poles and towers Hazards

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Perovskite-Type La0.6sr0.4co0.2fe0.8o3-Δ as an Artificial Interphase Layer for Dendrite-Free Li Metal Anodes

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SSRN 2022年

作者： Wu, Qichen Wang, Gang Huang, Qiao Xie, Shuhong Huang, Jianyu Wang, Xianyou Key Laboratory of Low Dimensional Materials and Application Technology Ministry of Education School of Materials Science and Engineering Xiangtan University Hunan Xiangtan411105 China National Base for International Science & Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery Hunan Province Key Laboratory of Electrochemical Energy Storage & Conversion School of Chemistry Xiangtan University Hunan Xiangtan411105 China

Lithium (Li) metal is considered as one of the most exciting anode materials for next-generation batteries because of its high theoretical capacity and lowest reduction potential. However, the uncontrollable dendrite growth associated with nonuniform deposition and huge volume change during cycling severely hampers its practical application in Li metal batteries. Herein, the perovskite-type La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) oxide is proposed as an artificial interphase layer to decorate copper directly via tape-casting method for uniform Li deposition. The positively charged oxygen vacancies (PCOVs) originated from the LSCF can serve as natural electrostatic shield for Li deposition to the adjacent regions in order to achieve a uniform and dendrite-free Li deposition morphology. Moreover, LSCF nanoparticles can firmly affix to Cu foil surface through elements inter-diffusion at the LSCF/Cu interface during heat treatment process, which facilitate Li ion transport and accommodate Li deposition behavior. As a result, the LSCF decorated Cu foil (denoted as LSCF-Cu) exhibits stable Coulombic efficiency (CE) of 98.51% beyond 300 cycles in Li||Cu cells and stable Li plating/stripping for 2850 h with low hysteresis voltage of 15 mV in symmetric cells. Further, the full cell coupled with LiNi 0.6 Co 0.2 Mn 0.2 O 4 (NCM) cathode (N/P is 4.17) exhibits a low polarization and prolonged cycle life. Therefore, this strategy will lay the foundation for designing advanced artificial interphase layer for dendrite-free Li and other metal batteries. © 2022, The Authors. All rights reserved.

关键词： Deposition

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Living fossils unearthed by blasting human chromosomes with Neanderthal mtDNA

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Digital Chinese Medicine 2022年第3期5卷 236-241页

作者： ZHANG Jia ZHOU Cuilan XIAO Li TUO Qinhui PENG Cuiying GUO Zifen LIAO Duanfang LI Kai National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology Hunan University of Chinese MedicineChangshaHunan 410208China SNP Institute School of Life ScienceUniversity of South ChinaHengyangHunan 421001China Division of Stem Cell Regulation and Application Key Laboratory for Quality Evaluation of Bulk Herbs of Hunan ProvinceHunan University of Chinese MedicineChangshaHunan 410208China

The successful retrieval of ancient mitochondrial DNA(mtDNA)from Neanderthals provides powerful experimental evidence that clarifies the arguments between the out-of-Africa and multiregional models of ***,the lack of nuclear DNA from Neanderthal fossils and mtDNA of early modern human fossils dating back to approximately the same time in the Pleistocene constitutes a limitation that may compromise the significance of mtDNA phylogenetic *** this report,we introduce a mitochromic analysis using Neanderthal mtDNA as a foreign transgene and humans as a naturally occurring transgenic *** Neanderthal mtDNA retrievable nuclear fragments were identified by blasting human genome data with Neanderthal *** of the 40 fragments exhibited higher correlation with Neanderthal mtDNA than those with modern human ***,these five nuclear fragments harbor Neanderthal mtDNA-unique *** on the 98%+identity between Neanderthal and modern human mtDNA when compared by groups,we suggest that some of the modern human nuclear fragments retrieved using Neanderthal mtDNA may aid in decoding Neanderthal genetic information,and also may simultaneously demonstrate a close genetic evolutionary relationship between modern humans and Neanderthals.

关键词： Neanderthal Mitochromics Human evolution Mitochondrial DNA(mtDNA)

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The Influence of Chlorides on Corrosion Behavior of Carbon Steel in Slag Based Geopolymer Pore Solution

SSRN

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SSRN 2023年

作者： Fan, Pengbo Wang, Yangyang Chen, Rui Hu, Jie Ma, Yuwei Zhang, Zuhua Huang, Haoliang Wei, Jiangxiong Shi, Caijun Yu, Qijun School of Materials Science and Engineering South China University of Technology Guangzhou510640 China Research Center for Wind Engineering and Engineering Vibration Guangzhou University Guangzhou510006 China Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and Engineering Tongji University Shanghai201804 China Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha410082 China

The surface characteristics and corrosion performance of carbon steel were investigated to clarify the influence of Cl- on its corrosion resistance in simulated slag based geopolymer (SSGP) solution. Adsorption layer (about 40 nm) still forms in Cl-containing SSGP solution, thus maintain the passivity of the reinforcement in SSGP solution with 3.5 wt. % and 7 wt. % Cl-. The passive film contains FeO/FeS internal film and FeOOH/Fe2O3 external film, exhibiting slightly reduced passive film resistance in Cl-containing SSGP solution. Further, the critical Cl- content in SSGP solution is dramatically larger, which is associated with the existence of adsorption layer and subsequently competitive adsorption of silicates. © 2023, The Authors. All rights reserved.

关键词： Iron oxides

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Design and Implementation of Carrier Detection System Based on FPGA 2

Design and Implementation of Carrier Detection System Based ...

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2020 2nd International Conference on Computer Modeling, Simulation and Algorithm, CMSA 2020

作者： Zhang, Xian Qu, Taiguo Liu, Yiwen Yin, Dong Deng, Shaowei School of Computer Science and Engineering Huaihua University Huaihua Hunan China Key Laboratory of Intelligent Control Technology Wuling-Mountain Ecological Agriculture in Hunan Province Huaihua Hunan418000 China Key Laboratory of Wuling-Mountain Health Big Data Intelligent Processing Application in Hunan Province Universities Huaihua Hunan418000 China

In order to better monitor and manage the signal transmission in the communication system and base station, and carrier detection is more effective. This paper designs a carrier(Carrier frequency) detection system based on FPGA, including system design requirements, FPGA selection, system framework design, carrier detection method design and so on. The performance indexes of the system are tested, such as carrier frequency range, carrier search time, carrier detection number and CPU consumption rate. The system has the advantages of high flexibility and good portability, and has a good application prospect in communication system, base station and other equipment. © Published under licence by IOP Publishing Ltd.

关键词： Field programmable gate arrays (FPGA)

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