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Study on lightning risk assessment and early warning for UHV DC transmission channel

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High Voltage 2019年第2期4卷 144-150页

作者： Shanqiang gu jian Wang Min Wu Juntian guo Chun Zhao jian Li Wuhan NARI Limited Liability Company State Grid Electric Power Research InstituteWuhan 430074People's Republic of China Department of Equipment Management State Grid Corporation of ChinaBeijing 100031People's Republic of China

Operation data show lightning faults account for>70%for the main ultra-high voltage(UHV)DC transmission channels,very different from the design *** order to accurately master the lightning characteristics and the lightning protection performance of the line so as to propose solutions to weak points,this study firstly obtains and analyses the density and strength distributions of lightning risk *** the study proposes a set of risk assessment process where the key model electrogeometric model is improved according to the polarity effect of DC *** the work realises the calculation of the lightning shielding failure risk of single tower and whole *** example shows the assessment result is consistent to the line's actual ***,to further evaluate and predict the lightning risk in real time,the study adopts the backpropagation neural network algorithm to integrate the lightning detection data,atmospheric electric fields,and radar echoes to develop the early warning model of lightning risk source,and proposed a method to realise the early warning of lightning damage risk for UHV DC *** results show that the effective warning ratio is 73%and the failure-to-warn ratio is 27%which indicates very good application effects.

关键词： lightning channel network

Collagen-based injectable and self-healing hydrogel with multifunction for regenerative repairment of infected wounds

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Regenerative Biomaterials 2023年第1期10卷 626-639页

作者： Haojie gu Han Li Liren Wei jian Lu Qingrong Wei National Engineering Research Center for Biomaterials(NERCB) Sichuan UniversityChengdu 610065P.R.China College of Biomedical Engineering Sichuan UniversityChengdu 610065P.R.China School of Life Science and Engineering Southwest University of Science and TechnologyMianyang 621000P.R.China

At present,the development trend of dressing materials is being multifunctional for convenient and long-term nursing care process of some complicated ***,basing on the theory of wound moist healing,an injectable and self-healing hydrogel comprising of collagen(COL),chitosan(CS)and oxidation modified Konjac glucomannan(OKGM),which acts as a macromolecular cross-linker to construct dynamic Schiff-base bonds was smartly *** strategy of introducing the silver nanoparticles(Ag NPs)into the COL-CS-OKGM hydrogel matrix achieved a markedly enhanced antibacterial activity derived from the synergistical effect between the Ag^(+)and the mild photothermal efficacy of Ag NPs,which also improved the local capillary blood circulation of the wound area to further facilitate wound healing *** excellent syringeability and self-healing behaviors endowed the COL-CS-OKGM-Ag hydrogel with self-adapting ability for the wounds with irregular and large area needing frequent applying and changing without secondary *** vitro and in vivo evaluations verified that so-designed COL-CS-OKGM-Ag hydrogel also with hemostatic performance is a promising multifunctional dressing for the treatments of infected wound with not only good biocompatibility and convenient use,but also with desired regenerative healing prognoses benefited from hydrogel moist environment and physiotherapy.

关键词： collagen injectable and self-healing hydrogel regenerative repair wounds

Dual-template synthesis of defect-rich mesoporous Co_(3)O_(4) for low temperature CO oxidation

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Chinese Chemical Letters 2023年第7期34卷 368-372页

作者： Shuhua Song jian Liang Wei Xiao Dong gu The Institute for Advanced Studies Wuhan UniversityWuhan 430072China College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China

CO oxidation is a benchmark in heterogeneous catalysis for evaluation of redox catalysts due to its practical relevance in many applications and the fundamental problems associated with its very high activity at low *** which,Co_(3)O_(4) is one of the most active non-precious metal *** crystal planes and cobalt sites are considered to be important for its high catalytic ***,we demonstrate an enhanced CO oxidation activity by a defect-rich mesoporous Co_(3)O_(4) that prepared by a designed dual-template *** different kinds of silicas are used as hard-templates at the same time,resulting in a defect-rich mesoporous Co_(3)O_(4) with a surface area as high as 169 m^(2)/*** catalyst exhibited a very high catalytic activity for low temperature CO oxidation with a light-off temperature at -73℃ under the space velocity of 80,000 mL h^(-1)g^(-1)_(cat).Further studies reveal that the high surface area promotes the lattice oxygen mobility,surface rich of Co^(2+)species and active oxygen species are crucial for the high catalytic ***,the dual-template approach paves a way towards the design and construction of high-surface-area mesoporous metal oxides for various applications.

关键词： Mesoporous Dual-template Co_(3)O_(4) CO oxidation Defect

Design and Analysis of S-CO_2 Cycle and Radial Turbine for SOFC Vehicle Waste-Heat Recovery

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Journal of Thermal Science 2019年第3期28卷 559-570页

作者： XIA Liu LI Xuesong SONG jian REN Xiaodong gu Chunwei Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power Engineering Tsinghua University Clean Energy Processes (CEP) Laboratory Department of Chemical Engineering Imperial College London

Solid oxide fuel cell(SOFC) vehicles are considered to have broad prospects for development, and the high operating temperature of SOFC results in great potential for waste-heat recovery. Many concepts for utilizing waste heat of SOFC have been suggested and studied, and most of them directly couple an SOFC to a gas turbine, which require the SOFC to operate at an elevated pressure and make the system less flexible and thus harder to operate. In recent years, with the development of turbine and heat exchanger technology, the supercritical carbon dioxide(S-CO_2) power cycle has raised widespread attractions for the waste recovery. This study explores the potential of S-CO_2 Brayton cycle to realize waste-heat recovery for an SOFC vehicle. The SOFC can operate at atmospheric pressure, and the hybrid system is easier to operate than the directly coupled systems. In this paper, a simple recuperated S-CO_2 Brayton cycle is proposed and the key component, radial inflow turbine is designed and focused. The flow state of the designed turbine is analyzed in detail based on computational fluid dynamics(CFD) numerical simulation. Five cases with different impeller tip clearances are numerically simulated to study its influence on the turbine performance. In addition, off-design performance analysis of the radial inflow turbine is conducted considering the temperature fluctuation of SOFC in practical applications.

关键词： SOFC waste-heat recovery supercritical carbon dioxide radial turbine

Efficient detection methods for amplify-and-forward relay-aided device-to-device systems with full-rate space-time block code

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Frontiers of Information Technology & Electronic Engineering 2017年第6期18卷 788-795页

作者： Kang-li ZHANG Cong ZHANG Fang-lin gu jian WANG College of Electronic Science and Engineering National University of Defence Technology School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University

Relay-aided device-to-device (D2D) communication is a promising technology for the next-generation cellular network. We study the transmission schemes for an amplify-and-forward relay-aided D2D system which has multiple antennas. To circumvent the prohibitive complexity problem of traditional maximum likelihood (ML) detection for full-rate space-time block code (FSTBC) transmission, two low-complexity detection methods are proposed, i.e., the detection methods with the ML-combining (MLC) algorithm and the joint conditional ML (JCML)detector. Particularly, the method with the JCML detector reduces detection delay at the cost of more storage and performs well with parallel implementation. Simulation results indicate that the proposed detection methods achieve a symbol error probability similar to that of the traditional ML detector for FSTBC transmission but with less complexity, and the performance of FSTBC transmission is significantly better than that of spatial multiplexing transmission. Diversity analysis for the proposed detection methods is also demonstrated by simulations.

关键词： Device-to-device Relay Detection Full-rate space-time block code

The pc-scale radio structure of MIR-observed radio galaxies

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Research in Astronomy and Astrophysics 2018年第9期18卷 31-46页

作者： Ye Yuan Min-Feng gu yong-Jun Chen Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China

We investigated the relationship between the accretion process and jet properties by utilizing very long baseline array （VLBA） and mid-infrared （MIR） data for a sample of 45 3CRR radio galaxies selected with a flux density at 178MHz 〉 16.4Jy, 5 GHz very large array （VLA） core flux density ≥7 mJy and MIR observations. The pc-scale radio structure at 5 GHz is presented by using our VLBA observations for 21 sources acquired in February, 2016, the analysis of archival data for 16 objects and directly obtaining measurements for eight radio galaxies available from literatures. The accretion mode is constrained from the Eddington ratio with a dividing value of 0.01, which is estimated from the MIR-based bolometric luminosity and the black hole masses. While most Fanaroff-Riley type II radio galaxies （FRIIs） have higher Eddington ratio than Fanaroff-Riley type I radio galaxies （FRIs）, we found that there is indeed no single correspondence between the FR morphology and accretion mode with eight FRIIs at low accretion rate and two FRIs at high accretion rate. There is a significant correlation between the VLBA core luminosity at 5 GHz and the Eddington ratio. Various morphologies are identi- fied in our sample, including core only, single-sided core-jet and two-sided core-jet structures. We found that the higher accretion rate may be more likely related with the core-jet structure, thus generating a more extended jet. These results imply that the higher accretion rates are likely able to produce more powerful jets. There is a strong correlation between the MIR luminosity at 15 ktm and VLBA 5 GHz core luminosity, in favor of the tight relation between the accretion disk and jets. In our sample, the core brightness temperature ranges from 109 to 101338 K with a median value of 10^11.09K, indicating that systematically the beaming effect may not be significant. The exceptional cases, FRIs at high accretion rates and FRIIs at low accretion rates, are exclusively at the high and l

关键词： galaxies active - galaxies structure - galaxies general --radio continuum galaxies

A new radar stealth design excited by ^(210)Po and ^(242)Cm

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Nuclear Science and Techniques 2022年第6期33卷 45-53页

作者： Jin-jian Yuan gui-Ping Meng Min gu Run-Sheng Huang School of Physics Nanjing UniversityNanjing 210093China

Open plasma stealth technology excited by radionuclides is known to have several problems:(1)owing to disturbance from airflow,the plasma distribution is unstable.(2)The plasma is highly dependent on the atmosphere;therefore,it is difficult to modulate in target stealth.(3)Concerns regarding radiation harassment prevent the application of this *** avoid these problems,an enclosed plasma stealth method is *** simulation on an infinite conducting plate,this method was found to effectively solve the above concerns,which may offer a new approach for the practical application of plasma stealth technology excited by radionuclides,especially for small-satellite stealth because of its lightweight and selfprovided plasma.

关键词： Radiation ionization αDecay particles Plasma film Radar stealth technology

Metal–Organic Framework‑Based Photodetectors

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Nano-Micro Letters 2024年第11期16卷 675-703页

作者： Jin‑Biao Zhang Yi‑Bo Tian Zhi‑Gang gu jian Zhang State Key Laboratory of Structural Chemistry Structure of MatterFujian Institute of ResearchChinese Academy of SciencesFuzhouFujian 350002People’s Republic of China College of Chemistry and Materials Science Fujian Nornal UniversityFuzhou 350007FujianPeople’s Republic of China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108FujianPeople’s Republic of China University of Chinese Academy of Science Beijing 100049People’s Republic of China

The unique and interesting physical and chemical properties of metal–organic framework(MOF)materials have recently attracted extensive attention in a new generation of photoelectric *** this review,we summarized and discussed the research progress on MOF-based *** methods of preparing MOF-based photodetectors and various types of MOF single crystals and thin film as well as MOF composites are introduced in ***,the photodetectors applications for X-ray,ultraviolet and infrared light,biological detectors,and circularly polarized light photodetectors are ***,summaries and challenges are provided for this important research field.

关键词： Metal-organic frameworks Semiconductor Photodetectors

Numerical simulation study on the mold strength of magnetic mold casting based on a coupled electromagnetic-structural method

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China Foundry 2024年第5期21卷 577-587页

作者： Wei-li Peng jian-hua Zhao Cheng gu Ya-jun Wang College of Materials Science and Engineering Chongqing UniversityChongqing 400045China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China National Key Laboratory of Advanced Casting Technologies Chongqing UniversityChongqing 400044China

The properties of the magnetic mold in magnetic mold casting directly determine the quality of the final cast *** this study,the magnetic mold properties in magnetic mold casting,were studied utilizing a coupled electromagnetic-structural method through numerical *** study investigated key factors including equivalent stress,the distribution of tensile and compressive stresses,and the area ratio of tensile *** compared molds made entirely of magnetic materials with those made partially of magnetic *** results indicate that as current increases from 4 A to 8 A,both the initial magnetic mold and the material-replaced magnetic mold initially show an increasing trend in equivalent stress,tensile-compressive stress,and the area ratio of tensile stress,peaking at 6 A before *** material replacement,the area ratio of tensile stress at 6 A decreases to 19.84%,representing a reduction of 29.72%.Magnetic molds comprising a combination of magnetic and non-magnetic materials exhibit sufficient strength and a reduced area ratio of tensile stress compared to those made entirely from magnetic *** study provides valuable insights for optimizing magnetic mold casting processes and offers practical guidance for advancing the application of magnetic molds.

关键词： magnetic mold casting coupled electromagnetic-structural method numerical simulation stress analysis