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A copula-based approach to accommodate intra-household interaction in workers' daily maintenance activity stop generation modeling

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第1期9卷 59-68页

作者： You-Lian chu Parsons Transportation Group New YorkNY 10005USA

A new stop frequency model was developed to predict the daily number of maintenance activity stops made by individual household heads during a typical weekday. This new model was based on the modification of a conventional multivariate ordered probit(MOP) model by maintaining the probit assumption for the marginal distributions while introducing nonnormal dependence among the error terms using copula functions. Therefore, the copulabased MOP model would relieve the restriction of imposing joint normality on the error terms in the conventional MOP model. The new MOP model would not only account for the intrahousehold interactions in stop-making decisions, but also allow the best functional form to be determined for representing dependencies among household heads. Using the New York Metropolitan Transportation Council’s 2010/2011 regional household travel survey data, the copula-based MOP model was employed to examine stop-making behavior for individual household heads residing in New York City and its adjacent counties in Mid-Hudson Valley and New Jersey. Empirical results provided useful insights into the observed effects of sociodemographics, land use density, transportation service, and work schedule together with potential unobserved common effects on the inter-relatedness of spousal stop-making decisions at the household level. The results show that the MOP model with a Clayton copula structure provides the best data fits and there is a very strong positive dependence among error terms of stop-making equations. Furthermore, the dependence among the maintenance activity propensities of household heads is asymmetric, with a stronger tendency of household heads to simultaneously have low maintenance activity levels than to simultaneously have high maintenance activity levels.

关键词： Stop-making propensity Maintenance activity episodes Multivariate ordered probit model Copula-based approach Intra-household interaction

Investigation of a Unified Chaotic System and Its Synchronization by Simulations

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Chinese Physics Letters 2010年第6期27卷 31-34页

作者： WU Qing-chu FU Xin-chu Michael Small Department of Mathematics Shanghai University Shanghai 200444 College of Mathematics and Information Science Jiangxi Normal University Nanchang 330022 Department of Electronic and Information Engineering Hong Kong Polytechnic University Hung Horn Kowloon Hong Kong

We investigate a unified chaotic system and its synchronization including feedback synchronization and adaptive synchronization by numerical simulations. We propose a new dynamical quantity denoted by K, which connects adaptive synchronization and feedback synchronization, to analyze synchronization schemes. We find that K can estimate the smallest coupling strength for a unified chaotic system whether it is complete feedback or one-sided feedback. Based on the previous work, we also give a new dynamical method to compute the leading Lyapunov exponent.

关键词： Synchronization Adaptation Adaptability

Subtropical urban turfs： Carbon and nitrogen pools and the role of enzyme activity

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Journal of Environmental Sciences 2018年第3期30卷 18-28页

作者： Ling Kong LM chu School of Life Sciences The Chinese University of Hong Kong Shatin NT Hong Kong SAR China department of orthopaedics & traumatology faculty of medicine the chinese university of hong kong

Urban grasslands not only provide a recreational venue for urban residents, but also sequester organic carbon in vegetation and soils through photosynthesis, and release carbon dioxide through respiration, which largely contribute to carbon storage and fluxes at regional and global scales. We investigated organic carbon and nitrogen pools in subtropical turfs and found that dissolved organic carbon（DOC） and dissolved organic nitrogen（DON）were regulated by several factors including microbial activity which is indicated by soil enzymatic activity. We observed a vertical variation and different temporal patterns in both soil DOC, DON and enzyme activities, which decreased significantly with increasing soil depths. We further found that concentration of soil DON was linked with turf age. There were correlations between grass biomass and soil properties, and soil enzyme activities. In particular, soil bulk density was significantly correlated with soil moisture and soil organic carbon（SOC）. In addition, DOC correlated significantly with DON. Significant negative correlations were also observed between soil total dissolved nitrogen（TDN） and grass biomass of Axonopus compressus and Zoysia matrella. Specifically, grass biomass was significantly correlated with the soil activity of urease and β-glucosidase. Soil NO3-N concentration also showed negative correlations with the activity of both β-glucosidase and protease but there were no significant correlations between cellulase and soil properties or grass biomass. Our study demonstrated a relationship between soil C and N dynamics and soil enzymes that could be modulated to enhance SOC pools through management and maintenance practices.

关键词： Dissolved organic carbon (DOC)lDissolved organic nitrogen (DON)lSoil enzymelTurfgrass

Renewables finance and investment: how to improve industry with private capital in China

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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1385-1398页

作者： Pingkuo LIU Penghao chu College of Economics and Management Shanghai University of Electric PowerShanghai 200090China

One purpose of stimulating financing and investment through private capital is to absorb a higher proportion of renewables and promote renewable industry *** paper first reviews the current overall situation of renewables financing and investment,and further analyzes the policy environment with respect to the development plan,regulation and special *** on the analysis of the status quo,the paper then discusses the internalities and the externalities that have driven the changes of private capital investment in renewable energy projects,illustrated by a strength,weakness,opportunity and threat(SWOT)*** ideal financing model,public-private partnership and distributed energy resource pattern are analyzed to identify key arrangements and design proper development schemes for both private investors and the *** China can overcome the defects and obstacles in a reasonable and orderly fashion,the financing and investment problem of China’s renewables industry will be solved in many *** capital in China’s renewable energy market will bring great incentive if the entire industry can select some promising sub-industries in the renewables sector and choose some appropriate operation modes.

关键词： Renewables industry Ideal financing model Public–private partnership Distributed energy resources

Homeostatic regulation of brain functions by endocannabinoid signaling

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Neural Regeneration Research 2015年第5期10卷 691-692页

作者： chu Chen Neuroscience Center of Excellence School of MedicineLouisiana State University Health Sciences Center

Humans have been using Cannabis and its extracts for a few thousand years as a medicinal and recreational drug. How- ever, the chemical component in Cannabis sativa, △9-tet- rahydrocannabinol （△9-THC）, an exogenous cannabinoid, remained unknown until it was isolated and identified as the main psychoactive ingredient （Gaoni and Mechoulam, 1964）.

关键词： CB Homeostatic regulation of brain functions by endocannabinoid signaling

MIL-100(Fe)-based functional materials for water decontamination: A state of the art review

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Progress in Natural Science:Materials International 2023年第4期33卷 386-406页

作者： Hongyu chu Chong-Chen Wang School of Environment and Energy Engineering Beijing University of Civil Engineering and Architecture Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation

Iron-based metal-organic frameworks(MOFs) have been received extensive attentions over the past years due to the low biotoxicity, multi-function, and wide applications. MIL-100(Fe) bearing unique structure has become the most popular Fe-based MOF up to now, and it is well-recognized as desirable environmental function material,especially for water purification. To provide systematic insight into MIL-100(Fe) for oriented design of novel materials, we review the recent progress and characteristics of MIL-100(Fe)-based materials, including MIL-100(Fe)-based composites, derivatives, and monoliths for water decontamination via adsorption, separation,and advanced oxidation processes(AOPs). Based on existing challenges and limitations discussed in this review,we further propose the future perspectives of MIL-100(Fe)-based materials for sustainable application in water remediation.

关键词： MIL-100(Fe) Water purification Adsorption Separation Advanced oxidation process

Motor cortical circuit adaptations in parkinsonism

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Neural Regeneration Research 2024年第10期19卷 2107-2108页

作者： Hong-Yuan chu Department of Neurodegenerative Science Van Andel Research InstituteGrand RapidsMIUSA Aligning Science Across Parkinson’s(ASAP)Collaborative Research Network

Parkinson's disease is a chronic and progressive neurodegenerative disorder characterized by the loss of dopaminergic neurons in the substantia nigra pars compacta,which leads to the featured motor impairment of parki... 详细信息

关键词： parkin impairment rigidity

Hepatopoietin Cn suppresses apoptosis of human hepatocellular carcinoma cells by up-regulating myeloid cell leukemia-1

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World Journal of Gastroenterology 2010年第2期16卷 193-200页

作者： chu-Tse Wu Department of Experimental Hematology Beijing Institute of Radiation Medicine27 Taiping Road

AIM:To investigate the role of hepatopoietin Cn(HPPCn) in apoptosis of hepatocellular carcinoma(HCC)cells and its mechanism. METHODS:Two human HCC cell lines,SMMC7721 and HepG2,were used in this ***, Western blotting and enzyme linked immunosorbent assay were conducted to identify the expression of HPPCn and the existence of an autocrine loop of HPPCn/ HPPCn receptor in SMMC7721 and *** cells were detected using fluorescein isothiocyanate (FITC)-conjugated Annexin V and propidium ***:The HPPCn was highly expressed in human HCC cells and secreted into culture medium(CM). FITC-labeled recombinant human protein(rhHPPCn) could specifically bind to its receptor on HepaG2 cells. Treatment with 400 ng/mL rhHPPCn dramatically increased the viability of HCC-derived cells from 48.1% and 36.9%to 85.6%and 88.4%,respectively(P< 0.05).HPPCn silenced by small-interfering RNA reduced the expression and secretion of HPPCn and increased the apoptosis induced by trichostatin ***, HPPCn could up-regulate the expression of myeloid cell leukemia-1(Mcl-1)in HCC cells via mitogen-activated protein kinase(MAPK)and sphingosine kinase-1. CONCLUSION:HPPCn is a novel hepatic growth factor that can be secreted to CM and suppresses apoptosis of HCC cells by up-regulating Mcl-1 expression.

关键词： Hepatopoietin Cn Autocrine Hepatocellular carcinoma Apoptosis Myeloid cell leukemia-1

INFINITE SERIES FORMULAE RELATED TO GAUSS AND BAILEY 2F1(1/2)-SUMS

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Acta Mathematica Scientia 2020年第2期40卷 293-315页

作者： Wenchang chu School of Mathematics and Statistics Zhoukou Normal UniversityZhoukou 466001China Department of Mathematics and Physics University of Salento(P.O.Box 193)73100 LecceItaly

The unifiedΩ-series of the Gauss and Bailey2F1(1/2)-sums will be investigated by utilizing asymptotic methods and the modified Abel lemma on summation by *** remarkable transformation theorems for theΩ-series will be proved whose particular cases turn out to be strange evaluations of nonterminating hypergeometric series and infinite series identities of Ramanujan-type,including a couple of beautiful expressions forπand the Catalan constant discovered by Guillera(2008).

关键词： Abel's lemma on summation by parts classical hypergeometric series Gauss'2F1(1/2)-sum Bailey's 2F1(1/2)-sum Saddle point method Catalan's constant