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Sustainable growth research–A study on the telecom operators in China

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Journal of Management Analytics 2022年第1期9卷 17-31页

作者： Hong chena Ling Li Yong Chen School of Business and Economics Indiana University EastRichmondINUSA College of Business and Public Administration Old Dominion UniversityNorfolkVAUSA Department of Management Information Systems and Data Analytics Texas A&M International UniversityLaredoTXUSA

In recent years,the telecom industry has faced digital transformation challenges and fierce market *** challenges push telecom operators to grow their subscriber bases by offering lower prices and improved services and new features,which puts pressure on operators’*** addition,the rise of Internet companies gradually erodes the profit of the traditional telecom ***,paying attention to the critical factors impacting firm sustainable growth can help operators get out of the *** on the resource-based view(RBV),this study explores the factors that influence the firm sustainable *** regression model is applied to empirically test the hypotheses with longitudinal time-series panel data from major telecom operators in *** study provides empirical evidence for sustainable growth research and useful insights for practitioners on the way to keep sustainable growth.

关键词： Sustainable growth telecom operator multiple regression model

A Study for the Influence of the Location of PCMs Assembly System on Improving Thermal Environment inside Disaster-Relief Temporary Houses

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Journal of Renewable Materials 2021年第7期9卷 1239-1252页

作者： Caixia Wang Xiao Huang Hongqing chena Weijie Liang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430061China Institute for Disaster Management and Reconstruction Sichuan UniversityChengdu610041China

Currently,people pay more and more attention to the transitional resettlement of victims after various natural *** is an urgent need for a large number of temporary houses to resettle the victims after natural ***-relief temporary houses(DTHs)played an important role in the post-disaster resettlement in the past,which can not only be produced on a large scale,but also can be quickly and conveniently erected,which were the main means to solve the problem of transitional ***,due to their temporary nature,there was no extra energy consuming system installed in the DTHs *** the indoor thermal environment inside the DTHs was severe in *** this study,combined with the field experimental tests of the DTHs in Wenchuan Earthquake and Lushan Earthquake and the experimental study of the full-size DTH,it found that the thermal environment inside the DTH was intolerably high in *** had negative impact on *** order to improve the thermal environment inside DTHs during post-disaster period which lacked of extra energy resources,this study used the method of combining phase change materials(PCMs)with walls of the DTH to explore its feasibility and *** results showed that PCMs could effectively improve the thermal environment inside the DTH in ***,the difference of the composite positions between PCMs and the wall affected the improvement *** energy release rate of the PCMs assembly system(PAS)varied according to the positions of the PCMs.

关键词： Disaster-relief temporary houses(DTHs) phase change materials(PCMs) indoor thermal environment

A novel business analytics approach and case study-fuzzy associative classifier based on information gain and rule-covering

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Journal of Management Analytics 2014年第1期1卷 1-19页

作者： Yue Ma Guoqing chena Qiang Wei Research Center for Contemporary Management Key Research Institute of Humanities and Social Sciences at Universities School of Economics and Management Tsinghua UniversityBeijing 100084China

Associative classification has attracted remarkable research attention for business analytics in recent years due to its merits in accuracy and *** is deemed meaningful to construct an associative classifier with a compact set of rules(i.e.,compactness),which is easy to understand and use in decision *** paper presents a novel approach to fuzzy associative classification(namely Gain-based Fuzzy Rule-Covering classification,GFRC),which is a fuzzy extension of an effective classifier *** GFRC,two desirable strategies are introduced to enhance the compactness with *** strategy is fuzzy partitioning for data discretization to cope with the‘sharp boundary problem’,in that simulated annealing is incorporated based on the information entropy measure;the other strategy is a data-redundancy resolution coupled with the rulecovering *** experiments show that GFRC had good accuracy,and was significantly advantageous over other classifiers in ***,GFRC is applied to a real-world case for predicting the growth of sellers in an electronic marketplace,illustrating the classification effectiveness with linguistic rules in business decision support.

关键词： associative classification information gain fuzzy partitioning simulated annealing rule-covering

Prevalence and methodologies for detection,characterization and subtyping of Listeria monocytogenes and *** in foods and environmental sources

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Food Science and Human Wellness 2017年第3期6卷 97-120页

作者： Jin-Qiang chena Patrick Regan Pongpan Laksanalamai Stephanie Healey Zonglin Hua Winchester Engineering Analytical Center(WEAC)HFR-NE460Office of Regulatory AffairsUS Food and Drug Administration109 Holton StreetWinchesterMA 01890USA MD DHMH Laboratories Administration Division of MicrobiologyRoom 5281770 Ashland Ave.BaltimoreMD 21205USA

Listeria monocytogenes,one of the most important foodborne pathogens,can cause listeriosis,a lethal disease for ***,which is closely related to ***,is also widely distributed in nature and infects mainly warm-blooded ruminants,causing economic ***,there are high priority needs for methodologies for rapid,specific,cost-effective and accurate detection,characterization and subtyping of *** and *** in foods and environmental *** this review,we(A)described *** and ***,world-wide incidence of listeriosis,and prevalence of various *** strains in food and environmental sources;(B)comprehensively reviewed different types of traditional and newly developed methodologies,including culture-based,antigen/antibody-based,LOOP-mediated isothermal amplification,matrix-assisted laser desorption ionization-time of flight-mass spectrometry,DNA microarray,and genomic sequencing for detection and characterization of *** in foods and environmental sources;(C)comprehensively summarized different subtyping methodologies,including pulsed-field gel electrophoresis,multi-locus sequence typing,ribotyping,and phage-typing,and whole genomic sequencing *** subtyping of *** strains from food and environmental sources;and(D)described the applications of these methodologies in detection and subtyping of *** in foods and food processing facilities.

关键词： Foodborne pathogens Listeria monocytogenes Listeria ivanovii Molecular characterization Subtyping

Novel polymer acceptors achieving 10.18% efficiency for all-polymer solar cells

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Journal of Energy Chemistry 2021年第2期30卷 63-68,I0003页

作者： Shaorong Huang Feiyan Wu Zuoji Liu Yongjie Cui Lie chena Yiwang Chen College of Chemistry/Institute of Polymers and Energy Chemistry(IPEC) Nanchang University.Nanchang 330031JiangxiChina Institute of Advance Scientific Research(iASR) Jiangxi Normal University99 Ziyang AvenueNanchang 330022JiangxiChina State Key Laboratory for Modification of Chemical Fibers and Polymer Materials&College of Materials Science and Engineering Donghua UniversityShanghai 201620China

Polymer acceptors based on extended fused ring p skeleton has been proven to be promising candidates for all-polymer solar cells(all-PSCs), due to their remarkable improved light absorption than the traditional imide-based polymer acceptors. To expand structural diversity of the polymer acceptors, herein,two polymer acceptors PSF-IDIC and PSi-IDIC with extended fused ring p skeleton are developed by copolymerization of 2,20-((2 Z,20 Z)-((4,4,9,9-tetrahexadecyl-4,9-dihydro-s-indaceno [1,2-b:5,6-b']dithio phene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1 H-indene-2,1-diylidene))dimalononitrile(IDIC-C16) block with sulfur(S) and fluorine(F) functionalized benzodithiophene(BDT) unit and silicon(Si) atom functionalized BDT unit, respectively. Both polymer acceptors exhibit strong light *** PSF-IDIC exhibits similar energy levels and slightly higher absorption coefficient relative to the PSi-IDIC. After blended with the donor polymer PM6, the functional atoms on the polymer acceptors show quite different effect on the device performance. Both of the acceptors deliver a notably high open circuit voltage(V_(OC)) of the devices, but PSi-IDIC achieves higher V OCthan PSF-IDIC. All-PSC based on PM6:PSi-IDIC attains a power conversion efficiency(PCE) of 8.29%, while PM6:PSF-IDIC-based device achieves a much higher PCE of 10.18%, which is one of the highest values for the all-PSCs reported so far. The superior device performance of PM6:PSF-IDIC is attributed to its higher exciton dissociation and charge transport, decreased charge recombination, and optimized morphology than PM6:PSi-IDIC counterpart. These results suggest that optimizing the functional atoms of the side chain provide an effective strategy to develop high performance polymer acceptors for all-PSCs.

关键词： All-polymer solar cells Polymer acceptor Functional atoms Power conversion efficiency

A simple method for the isolation and purification of resveratrol from Polygonum cuspidatum

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Journal of Pharmaceutical Analysis 2013年第4期3卷 241-247页

作者： Dong-Geng Wanga Wen-Ying Liub Guang-Tong chena Medical School Nan Tong University Department of Pharmaceutical Analysis China Pharmaceutical University

Resveratrol, a polyphenol compound with strong biological activity, has been widely used in medicine, health products and cosmetic industries. It is also the main active component of Polygonurn cuspidatum, a well-known traditional Chinese medicine. We developed a simple and effective method for the preparation of resveratrol from P. cuspidatum. The whole preparative process consisted of reflux extraction, filtering, hydrolyzing, liquid-liquid extraction and eluting. Filtering is to remove non polar or less polar compounds and debris fragments from the extract. Hydrolyzing is to transform polydatin to resveratrol to improve the yield of resveratrol. Eluting is to remove impurities including strong acidic and water-soluble compounds. By acid hydrolysis of glycoside （polydatin）, the yield of resveratrol increased about 4-fold. The extraction recovery in different stages was high, and the content of resveratrol in the final product was over 73.8%. Compared with other methods reported, this technology is eco-friendly, easier to perform, and also has a lower cost.

关键词： Potygonum cuspidaturn Resveratrol Solvent extraction Purification

Acquired Cardiomyopathy Caused by Cardiac Tsc1 Deficiency

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Journal of Genetics and Genomics 2014年第2期41卷 73-77页

作者： Yi chena Fang Wang Chunjia Li Lianmei Wang Hongbing Zhang Hongbing Yan Department of Cardiology Beijing An Zhen HospitalCapital Medical University Department of Physiology Institute of Basic Medical Sciences and School of Basic MedicinePeking Union Medical College and Chinese Academy of Medical Sciences Center for Coronary Heart Disease Cardiovascular Institute & Fu Wai HospitalPeking Union Medical College and Chinese Academy of Medical Sciences

Cardiomyopathies are myocardial disorders with enlarged, thick, or rigid cardiac muscles. Because no effective treatment is available to prevent the deterioration of the myocardium function, the prognosis of cardiomyopathy is usually poor. Cardiomyopathies can be inherited or acquired. A number of genes associated with inherited cardiomyopathy, such as the genes encoding for sarcomeric, cytoskeletal,

关键词： than Acquired Cardiomyopathy Caused by Cardiac Tsc1 Deficiency mTOR BNP MyHC

Optimized strength and conductivity of multi-scale copper alloy/metallic glass composites tuned by a one-step spark plasma sintering(SPS)process

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Journal of Materials Science & Technology 2022年第33期128卷 22-30页

作者： Weizong Bao Jie Chen Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

A superiority in interfacial bonding is favorable to fabricate high-strength conductive composites for electrical contact *** the present work,high strength and high conductivity multi-scale metallic glass composites(including micron-scale Cu Zr Al metallic glass reinforcement,hundred-nanometer-scale Cu Cr Zr crystalline grain matrix,and nano-scale precipitated phase)were fabricated by a one-step spark plasma sintering(SPS).The strength and conductivity of the bulk copper matrix metallic glass composites(BCMGCs)were enhanced simultaneously with the increase in the sintering pressure of the *** excellent performance is attributed to the improved interfacial bonding between the metallic glass reinforcement and the copper alloy matrix due to the high pressure assisted by temperature and pulsed *** particular,the precipitation of nanoprecipitates at the interface further reduces the interfacial resistance and improves the mechanical properties of the *** work broadens the horizon for the selection and optimization of reinforcements and manufacturing processes for high-performance electrical contact materials(ECMs).

关键词： CuZrAl metallic glass Spark plasma sintering Mechanical properties Electrical performance

Examining effective use of data sources and modeling algorithms for improving biomass estimation in a moist tropical forest of the Brazilian Amazon

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International Journal of Digital Earth 2017年第10期10卷 996-1016页

作者： Yunyun Feng Dengsheng Lu Qi chena Michael Keller Emilio Moran Maiza Nara dos-Santos Edson Luis Bolfe Mateus Batistella The Nurturing Station for the State Key Laboratory of Subtropical Silviculture Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang ProvinceSchool of Environmental&Resource SciencesZhejiang Agriculture and Forestry UniversityLin AnPeople’s Republic of China Center for Global Change and Earth Observations Michigan State UniversityEast LansingMIUSA Department of Geography University of Hawaii at ManoaHonoluluHIUSA Brazilian Agricultural Research Corporation–Embrapa Informática Agropecuária CampinasBrazil USDA Forest Service International Institute of Tropical ForestryRio PiedrasPRUSA Brazilian Agricultural Research Corporation–Embrapa Secretariat of Intelligence and Macro StrategyBrasíliaBrazil Brazilian Agricultural Research Corporation(Embrapa) BrasíliaBrazil

Previous research has explored the potential to integrate lidar and optical data in aboveground biomass(AGB)estimation,but how different data sources,vegetation types,and modeling algorithms influence AGB estimation is poorly *** research conducts a comparative analysis of different data sources and modeling approaches in improving AGB ***-based spectral responses and textures,lidar-derived metrics,and their combination were used to develop AGB estimation *** results indicated that(1)overall,RapidEye data are not suitable for AGB estimation,but when AGB falls within 50–150 Mg/ha,support vector regression based on stratification of vegetation types provided good AGB estimation;(2)Lidar data provided stable and better estimations than RapidEye data;and stratification of vegetation types cannot improve estimation;(3)The combination of lidar and RapidEye data cannot provide better performance than lidar data alone;(4)AGB ranges affect the selection of the best AGB models,and a combination of different estimation results from the best model for each AGB range can improve AGB estimation;(5)This research implies that an optimal procedure for AGB estimation for a specific study exists,depending on the careful selection of data sources,modeling algorithms,forest types,and AGB ranges.

关键词： Lidar RapidEye aboveground biomass moist tropical forest support vector regression random forest linear regression stratification