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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 287-298页

作者： Yifeng Liu Xiaoping Zhou Quan Chen Hanhang Yin Lerong Hong Hao Tian Ying Chen Siyuan Li the College of Electrical and Information Engineering Hunan UniversityChangsha 410082China the Zhejiang Magtron Intelligent technology Limited Cooperation Jiaxing 314000China the State Grid Qianjiang Electric Power Company Qianjiang 433100China

Line commutated converter based high-voltage direct-current(LCC-HVDC)transmissions are prone to harmonic oscillation under weak *** modeling is an effective method for assessing interaction ***,this paper proposes an improved calculation method for the DC voltage and AC currents of commutation stations to address the complex linearization of the commutation process and constructs an overall harmonic state-space(HSS)model of an *** on the HSS model,the closed-loop AC impedances on the LCC-HVDC sending and receiving ends are then derived and *** impedance characteristics of the LCC-HVDC are then analyzed to provide a physical explanation for the harmonic oscillation of the *** effects of the grid strength and control parameters on system stability are also *** improve the impedance characteristics and operating stability of the LCC-HVDC system,a virtual impedance based stability enhancement control is proposed,and a parameter design method is considered to ensure satisfactory phase margins at both the sending and receiving ***,simulation results are presented to verify the validity of the impedance model and virtual impedance based stability enhancement control.

关键词： Line commutated converter based high-voltage direct-current(LCC-HVDC)transmission harmonic state space stability analysis harmonic oscillation virtual impedance

Hierarchical crystalline-amorphous nanocomposites with high strength and large deformability enabled by elemental diffusion

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Journal of Materials science & technology 2024年第4期171卷 150-161页

作者： Liqiang Wang Heyi Wang Xin Zhou Huangliu Fu James Utama Surjadi Shuo Qu Xu Song Rong Fan Yang Lu Department of Mechanical Engineering City University of Hong KongHong KongChina Nano-Manufacturing Laboratory(NML) Shenzhen Research Institute of City University of Hong KongShenzhen 518057China Chengdu Research Institute City University of Hong KongChengdu 610200China Shenyang National Laboratory for Materials science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong KongChina Department of Mechanical Engineering The University of Hong KongHong KongChina

Amorphous/nanocrystalline dual-phase structures have recently emerged as an effective way for over-coming the strength-ductility trade-offand breaking the limitation of the reverse Hall-Petch ***,we proposed a new strategy to develop a hierarchical and interconnected amorphous-crystalline nanocomposite arising from the nanoscale elemental interdiffusion and oxygen adsorption behavior dur-ing thermal treatment *** nanocomposite consisted of a three-dimensional(3D)hierarchical network structure where the crystalline phase(Cr-Co-Ni-Al)was embedded into the Al-O-based amor-phous phase network with critical feature sizes encompassing three orders of magnitude(from microm-eter to nanometer scale).It can achieve ultrahigh compression yield strength of-3.6 GPa with large homogeneous deformation of over 50%*** massive interstitial atoms induced lattice distortion and hierarchical amorphous phase boundary contributed to the strength *** situ Uniaxial compression inside a transmission electron microscope(TEM)revealed that the exceptional deformability of the nanocomposites resulted from the homogenous plastic flow of nano-sized amorphous phase and the plastic co-deformation behavior restricted by the nano-architected dual-phase *** proposed dual-phase synthesis approach can outperform conventional nanolaminates design strategies in terms of the mechanical properties achievable while providing a pathway to easily tune the microstructure of these nanolaminates.

关键词： Nanolaminates Dual-phase nanocomposites In situ transmission electron microscopy Multi-component alloy

Tuning electronic properties of cobalt phthalocyanines for oxygen reduction and evolution reactions

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science China Chemistry 2024年第1期67卷 398-407页

作者： Jianlin Jiang Zhen Liu Shuaijun Pan Xinnian Xia Bing Qin Yang Hu Xuxu Wang Jiamin Lan Yu Gu Encai Ou Weijian Xu Joseph J.Richardson Rui Guo SINOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083China College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082China College of Chemistry and Materials science Hunan Agricultural UniversityChangsha 410128China Department of Chemical Engineering The University of MelbourneParkville 3010Australia College of Environmental science and Engineering Hunan UniversityChangsha 410082China School of Engineering RMIT UniversityMelbourneVictoria 3001Australia

Metal–phthalocyanines are a class of catalytically active materials promising in energy conversion and storage fields(e.g.,electrocatalysis).However,understanding and controlling the electrochemical properties in metal-phthalocyanine systems is ***,we elucidate the electrocatalytic origins of a series of cobalt-phthalocyanine molecular catalysts and finetune their electronic properties at the atomic level,both experimentally and *** interactions between the cobalt center and the local coordination environment are regulated by introducing either electron-donating or electron-withdrawing groups on the phthalocyanine ligand,and the spin-orbit splitting of cobalt is increased by~0.15 eV compared with the nonsubstituted ***,the aminated cobalt phthalocyanine-based electrocatalysts exhibit low free energies in the ratedetermining steps of the oxygen reduction(-1.68 eV)and oxygen evolution reactions(0.37 eV).This contributes to the high electrocatalytic activity(e.g.,a halfwave potential of 0.84 V and an overpotential of 0.30 V at 10 mAcm^(-2)),featuring a high selectivity of a four-electron pathway(i.e.,a negligible by-product of hydrogen peroxide).These catalysts also exhibit exceptional kinetic current density(Tafel slope of 100 mV dec^(-1))in oxygen reduction reactions,in addition to a superior power density(158 mWcm^(-2))and a high cycling stability(>1,300 cycles)in Zn-air batteries,outperforming the commercial Pt/C and/or RuO2counterparts.

关键词： interfacial wettability molecular catalysts carbon nanotubes density functional theory electrochemistry

Thermal comfort in a building with Trombe wall integrated with phase change materials in hot summer and cold winter region without air conditioning

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Energy and Built Environment 2024年第1期5卷 58-69页

作者： Jie Li Yuan Zhang Ziyang Zhu Jiangtian Zhu Jing Luo Fen Peng Xiaoqin Sun School of Energy and Power Engineering Changsha University of Science and TechnologyChangshaHunan 410114PR China

Trombe wall and phase change materials(PCMs)are two effective ways to regulate indoor thermal ***,Trombe wall surfers from overheating in summer and PCMs suffer from low heat transfer rate caused by the limited thermal *** compensate the shortcomings of the two methods,this paper proposed a Trombe wall system integrated with *** on a light-weight building envelope in changsha,China,the thermal comfort of 10 kinds of Trombe wall systems with PCMs with a melting temperature of 18-28℃ were *** the integrated indoor discomfort duration(I_(D)),integrated indoor discomfort degree-hour(I_(DH)),indoor air temperature(T_(in)),PCM liquid fraction(γ)and heat flux across wall(q)as evaluation indexes,the indoor thermal comfort was assessed in hot summer and cold winter *** show that the Trombe wall helped PCMs complete the phase change process *** wall with PCM25 next to the wall inner surface possessed the lowest annual I_(D) and I_(DH),as 2877 h and 12,974℃·h,*** with the values in a traditional building,the I_(D) and I_(DH) were reduced by 7.01% and 14.14%.In order to give full play to the heat storage and heat release of the Trombe wall with PCMs,PCMs with phase change temperature 7℃ lower than the peak ambient temperature in summer or 8℃ higher than the winter night temperature was recommended according to regional climate conditions.

关键词： Trombe wall Phase change materials Integrated indoor discomfort duration Integrated discomfort degree-hour Liquid fraction

Machine learning based on metabolomics unveils neutrophil extracellular trap-related metabolic signatures in non-small cell lung cancer patients undergoing chemoimmunotherapy

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World Journal of Clinical Cases 2024年第20期12卷 4091-4107页

作者： Yu-Ning Li Jia-Lin Su Shu-Hua Tan Xing-Long Chen Tian-Li Cheng Zhou Jiang Yong-Zhong Luo Le-Meng Zhang School of Life and Health sciences Hunan University of Science and TechnologyXiangtan 411201Hunan ProvinceChina Department of Thoracic Medicine Hunan Cancer HospitalChangsha 410013Hunan ProvinceChina

BACKGROUND Non-small cell lung cancer(NSCLC)is the primary form of lung cancer,and the combination of chemotherapy with immunotherapy offers promising treatment options for patients suffering from this ***,the emergence of drug resistance significantly limits the effectiveness of these therapeutic ***,it is imperative to devise methods for accurately detecting and evaluating the efficacy of these *** To identify the metabolic signatures associated with neutrophil extracellular traps(NETs)and chemoimmunotherapy efficacy in NSCLC *** In total,159 NSCLC patients undergoing first-line chemoimmunotherapy were *** first investigated the characteristics influencing clinical *** levels of NETs and cytokines were measured by commercial *** chromatography tandem mass spectrometry quantified plasma metabolites,and differential metabolites were *** absolute shrinkage and selection operator,support vector machine-recursive feature elimination,and random forest algorithms were *** using plasma metabolic profiles and machine learning algorithms,predictive metabolic signatures were *** First,the levels of circulating interleukin-8,neutrophil-to-lymphocyte ratio,and NETs were closely related to poor efficacy of first-line *** were classed into a low NET group or a high NET group.A total of 54 differential plasma metabolites were *** metabolites were primarily involved in arachidonic acid and purine *** key metabolites were identified as crucial variables,including 8,9-epoxyeicosatrienoic acid,L-malate,and bis(monoacylglycerol)phosphate(18:1/16:0).Using metabolomic sequencing data and machine learning methods,key metabolic signatures were screened to predict NET level as well as chemoimmunotherapy *** The identified metabolic signatures may effectively distinguish NET levels and predict clinical

关键词： Non-small cell lung cancer Chemoimmunotherapy Neutrophil extracellular traps Metabolomics Machine learning

基于细胞衰老角度结直肠癌治疗方法的进展:中西药物的比较研究

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Journal of Chinese Pharmaceutical sciences 2024年第5期33卷 396-411页

作者：张涛刘皓辰赵亮张沂婧邓宇何永恒湖南中医药大学研究生院湖南长沙410208 湖南省中医药研究院附属医院湖南长沙410006

结直肠癌(Colorectal carcinoma,CRC)为临床高发的恶性肿瘤。本病由各种综合因素促成,病因病机复杂,至今尚未明确。细胞衰老是一种永久性的细胞周期终止状态,抗肿瘤发生有力的保护机制,在CRC发生中的发挥着至关重要的作用。CRC是一种发... 详细信息

结直肠癌(Colorectal carcinoma,CRC)为临床高发的恶性肿瘤。本病由各种综合因素促成,病因病机复杂,至今尚未明确。细胞衰老是一种永久性的细胞周期终止状态,抗肿瘤发生有力的保护机制,在CRC发生中的发挥着至关重要的作用。CRC是一种发病率很高的恶性肿瘤,病因复杂且不甚明了。细胞衰老的特点是不可逆的细胞分裂停滞,它在CRC的发展过程中发挥着至关重要的作用,是防止肿瘤形成的一种防御机制。目前临床上治疗CRC的方法,如手术、放疗和化疗,往往副作用大、费用高,给患者带来巨大的生理和心理负担。因此,探究副反应轻且疗效稳定的中医药疗法迫在眉睫。近年来,大量相关研究表明中药单体及复方能调控癌细胞衰老而发挥抗癌的作用,为临床上防治CRC提供了新思路。然而,目前尚缺乏中医药调控细胞衰老防治CRC的系统综述。因此,本文对近年来靶向调节细胞衰老以治疗CRC的西药化合物、中药单体及复方进行系统总结,以期为CRC的治疗及药物研发提供新思路。

关键词：细胞衰老结直肠癌中医药西药研究进展

Hepatitis of unknown etiology in children:Current evidence and association

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World Journal of Clinical Cases 2022年第35期10卷 12837-12843页

作者： Rui Zhong Feng Yi Fen Xiang Yan-Fang Qiu Lei Zhu Yan-Hui Zou Wei Wang Qiong Zhang Department of Medical Oncology Digestive and Urinary UnitHunan Cancer Hospital/The Affiliated Cancer Hospital of Xiangya School of MedicineCentral South UniversityChangsha 410013Hunan ProvinceChina Department of Emergency Yueyang Central HospitalYueyang 414100Hunan ProvinceChina Department of Radiation Therapy Oncology Hunan Cancer Hospital/The Affiliated Cancer Hospital of Xiangya School of MedicineCentral South UniversityChangsha 410013Hunan ProvinceChina School of Nursing Hunan University of Chinese MedicineChangsha 410208Hunan ProvinceChina Health Service Centre Hunan Cancer Hospital/The Affiliated Cancer Hospital of Xiangya School of MedicineCentral South UniversityChangsha 410013Hunan ProvinceChina

Two years after the coronavirus disease 2019(COVID-19)pandemic,acute hepatitis of unknown etiology in children(AHUCD)began to be reported *** novel coronavirus and adenovirus were found in pathogen and antibody tests in AHUCD cases reported by the World Health *** are not exposed to the viruses that children are generally exposed to owing to COVID-19 infection preventive measures such as isolation and wearing masks;therefore,some researchers have speculated that this disease is related to reduced exposure to *** scientists have also speculated that the disease is related to liver injury and adenoviral hepatitis,which are the sequelae of *** evidence also suggests a weak association between the disease and COVID-19 ***,further research and investigation of the pathogenesis,preventive measures,and early treatment of hepatitis of unknown etiology are *** study aimed to synthesize available evidence to further elucidate this disease in order to treat and prevent it effectively.

关键词： Acute hepatitis of unknown etiology Coronavirus disease Adenovirus Immune system Vaccine Multi-system inflammatory syndrome in children

Research on a Composite Biomass Insulation Material with Geopolymers as Binders and Forestry Waste as Fillers

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Journal of Thermal science 2022年第2期31卷 590-605页

作者： LI Hongqiang ZOU Si LIU Tiantian WANG Shuang ZOU Jun ZHANG Xiaofeng LIU Lifang BAI Chengying ZHANG Guoqiang College of Civil Engineering Hunan UniversityChangsha 410082China National Center for International Research Collaboration in Building Safety and Environment(NCIRCBSE) Hunan UniversityChangsha 410082China Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education Hunan UniversityChangsha 410082China State Key Laboratory of Plant Physiology and Biochemistry China Agricultural UniversityBeijing 100193China College of Energy and Power Engineering Changsha University of Science and TechnologyChangsha 410114China College of Civil Engineering Hunan University of Science and TechnologyXiangtan 411201China Key Laboratory of Superlight Materials and Surface technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China

A composite biomass insulation material,which uses geopolymers as adhesives and forestry waste as fillers,was proposed and experimentally *** orthogonal experimental method was adopted to analyze the optimum theoretical oxide molar ratios and the mass ratio of mixing water to binder(m_(w2)/m__(B))for preparing *** influences of curing regimes(including one-stage and two-stage curing methods)and m_(w2)/m_(B) ratios of the insulation materials on mechanical,thermal,and hydraulic performances were also studied by *** results indicated that the optimum combination scheme of preparing geopolymers was molar ratio x_(SiO_(2))/x_(Na_(2)O)=3.3,x_(SiO_(2))/x_(Al_(2)O_(3))=3.2 and m_(w2)/m_(B)=0.5 with the highest mechanical strength of 34.21 ***,the best curing conditions of the composite material were the curing temperatures of 85°C and 70°C under the two-stage curing regime,which could achieve the low heat conductivity of 0.123 and 0.125 W/(m·K),and the high mechanical strength of 1.70 MPa and 1.71 MPa,*** optimum m_(w2)/m_(B)ratios of the biomass material were 0.5 to 0.55 with heat conductivity of 0.114 to 0.125 W/(m·K).This novel composite insulation material has satisfying physical performances,which is helpful for achieving building energy conservation.

关键词： sawdust forestry waste energy conservation prefabricated buildings composite biomass insulation materials

Gene expression profiling of HepG_(2) cells after treatment with black tea polyphenols

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BIOCELL 2018年第3期42卷 99-104页

作者： Jie Zhong Li Deng Yu Jiang Lianhong Zou Huabing Yuan Shuang-xiang Tan Scientific Research Department Hunan Province Institute of GerontologyHunan Provincial People’s Hospital/The First Affiliated Hospital of Hunan Normal UniversityChangshaChina Center of Reproductive Medicine Hunan Provincial People’s Hospital/The First Affiliated Hospital of Hunan Normal UniversityChangshaChina Hunan Provincial Key Laboratory of Emergency and Critical Care Metabonomics Hunan Provincial People’s Hospital/The First Affiliated Hospital of Hunan Normal UniversityChangshaChina Pharmacy Department Tianmen First People’s HospitalTianmenHubeiChina

This study aimed to determine the effects of black tea polyphenols on gene expression in hepatocellular cancer *** total RNA from HepG_(2) hepatocellular cancer cells treated with black tea polyphenols was subjected to Human 14K cDNA microarray ***-time PCR and Western blot analysis were conducted to verify microarray *** tea polyphenols treatment at the dose of 20 mg/L,40 mg/L or 80 mg/L for one to three days inhibited the growth of HepG_(2) cells in a dose and time dependent manner.A total of 48 genes showed more than two-fold change after black tea polyphenols treatment,including 17 upregulated genes and 31 downregulated genes,and they were involved in the regulation of cell growth,cell cycle,apoptosis,signaling,angiogenesis,tumor invasion and ***-time PCR analysis of the selected genes showed that their mRNA expression changes were consistent with the microarray *** addition,Western blot analysis of the selected genes showed that their protein expression changes were consistent with mRNA *** conclusion,gene expression profiles provide comprehensive molecular mechanisms by which black tea polyphenols exerts growth inhibition effects on cancer *** novel molecular targets identified in this study may be further exploited as therapeutic strategies for hepatocellular cancer.

关键词： Black tea polyphenols Microarray HepG_(2)cells Gene expression

A tunable yellow emission from three-band emission of singly doped single-phased phosphor BaY_2S_4:Ho^(3+)

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Journal of Rare Earths 2011年第5期29卷 436-439页

作者：赵君风陈茜荣春英余丽萍廉世勋 Key Laboratory of Resource Fine-Processing and Advanced Materials Universities of Hunan ProvinceCollege of Chemistry and Chemical EngineeringHunan Normal University Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research (Ministry of Education) Hunan Normal University

The establishment of an approach to design tunable yellow emission through singly doped single-phased phosphors to obtain white LED-based InGaN chip was reported. BaY2–xS4：xHo3＋ phosphors were prepared by the high temperature solid state reaction and characterized by X-ray diffraction and photoluminescence spectra. Under the excitation of 465 nm,the emission spectra of these phosphors exhibited three sharp emission lines peaked at about 492,543 and 661 nm of Ho3＋ corresponding to 5F3,5F4 （5S2） and 5F5→5I8 transitions,respectively,with comparable intensities,resulting in a yellow light emission. The luminescence mechanism for Ho3＋ in BaY2S4 was explained.

关键词： rare earths BaY2S4:Ho3+ yellow emission singly doped single-phased phosphor