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NEW PRODUCT DESIGN STRATEGIES WITH SUBSIDY POLICIES

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Journal of Systems Science and Systems Engineering 2012年第3期21卷 356-371页

作者： xuemei ZHANG xiaoyan xu Ping HE School of Management University of Science & Technology of China Hefei 230026 China School of Economics and Management Fuyang Teachers College Fuyang 236037 China

Industrial development can enrich people＇s lives, but it also causes environmental pollution, which is an area of significant concern among governments, consumers, and companies. Governments formulate some environmental policies, which motivate industry by providing greater incentives for green product development. Consumers are classified into two groups - ordinary and green market segments - according to their environmental awareness and attitudes. In this regard, companies need to reconsider their primary product design strategies. By investigating the interactions among customers＇ preferences, firms＇ product strategies, and government subsidy policies, this paper presents a theoretical model for new product design strategies. After detailed theoretical analysis of such strategies, we found that to motivate firms to choose environmentally friendly product design strategies, governments should inaugurate effective subsidy policies. After simultaneously considering environmental issues and firms＇ benefits, we designed a subsidy policy. With such a policy, firms can change their primary product design strategies and develop both green and ordinary products, thereby increasing the firms＇ profits and improving the total environmental quality.

关键词： Product design strategy subsidy policy green product total environmental quality

OPTIMAL PRICING STRATEGY TO REDUCE FUEL CONSUMPTION IN ELECTRICITY GENERATION WITH SMART METER

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Journal of Systems Science and Systems Engineering 2015年第1期24卷 81-106页

作者： xiaoyan xu Zhuang Ma Liang xu Ye Lu School of Management University of Science & Technology of China School of Management Zhejiang University Department of Management Science City University of Hong Kong

It has been widely recognized that the efficiency of a thermal power system can be improved by technological advancement of electricity generation and manipulation of electricity consumption. The smart meter enables two-way communication between the customers and the electricity generation system. The electricity generation system uses price incentive （i.e. a higher price in the peak period and a lower price in the off-peak period） to shift part of demands from peak to off-peak period under the smart grid environment. Given the fact that fuel consumption in each period is a strictly increasing convex function of power output, we propose two-period and multi-period pricing strategies, and study the effect of different pricing strategies on reducing fuel consumption.

关键词： Pricing strategy smart meter energy consumption,convex programming

Reliability Simulation and Design Optimization for Mechanical Maintenance

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Chinese Journal of Mechanical Engineering 2009年第4期22卷 594-601页

作者： LIU Deshun HUANG Liangpei YUE Wenhui xu xiaoyan Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment Hunan University of Science and Technology Xiangtan 411201 China

Reliability model of a mechanical product system will be newly reconstructed and maintenance cost will increase because failed parts can be replaced with new components during service, which should be accounted for in system design. In this paper, a reliability model and reliability-based design optimization methodology for maintenance are presented. First, based on the time-to-failure density function of the part of the system, the age distributions of all parts of the system during service are investigated, a reliability model of the mechanical system for maintenance is developed. Then, reliability simulations of the systems with WeibuU probability density functions are performed, the system minimum reliability and steady reliability for maintenance are defined based on reliability simulation during the life cycle of the system. Thirdly, a maintenance cost model is developed based on replacement rates of the parts, a reliability-based design optimization model for maintenance is presented, in which total life cycle cost is considered as design objective and system reliability as design constrain. Finally, the reliability-based design optimization methodology for maintenance is used to design of a link ring for the chain conveyor, which shows that optimal design with the lowest maintenance cost can be obtained, and minimum reliability and steady reliability of the system can satisfy requirement of system reliability during service of the chain conveyor.

关键词： maintenance reliability simulation design optimization

ADVANCE SELLING IN THE PRESENCE OF PRODUCT DIFFUSION EFFECT

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Journal of Systems Science and Systems Engineering 2017年第1期26卷 77-99页

作者： xiaoyan xu xuemei Li Yiwen Bian Yanhong Sun School of Management University of Science & Technology of China Hefei 230026 China School of Management Zhejiang University Hangzhou 310058 China SHU-UTS SILC Business School Shanghai University Shanghai 201899 China

Product diffusion refers to the phenomenon that the later demand is dependent on the early sales. To investigate how a firm＇s advance selling strategy is affected by the effect of product diffusion, we consider a monopolist seller who sells a fashionable product in a market that comprises of myopic and strategic consumers over two periods （i.e., the advance selling season and the regular selling season）. For a linear product diffusion effect we fred that, when the effect of product diffusion is positive, the seller may set an extremely high advance selling price to induce the strategic consumers to purchase in the regular selling season, which is counter-intuitive. Moreover, the optimal procurement quantity for the seller may increase in the negative effect of product diffusion and decrease in the amount of strategic consumers. When we extend our model to consider a concave quadratic product diffusion effect, however, the optimal procurement quantity is concave in the amount of strategic consumers. Numerical studies are further presented to discuss the managerial insights.

关键词： Advance selling product diffusion strategic consumer behavior interface on marketing andoperations management

Copper stimulates the incidence of antibiotic resistance, metal resistance and potential pathogens in the gut of black soldier fly larvae

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Journal of Environmental Sciences 2021年第9期33卷 150-159页

作者： Nan Wu Jiaqi Liang Xiaobo Wang Shiyu Xie xiaoyan xu College of Engineering and Technology Tianjin Agricultural UniversityTianjin 300384China College of Agronomy and Resource and Environment Tianjin Agricultural UniversityTianjin 300384China

The black soldier fly larvae(BSFL) have been successfully applied to treat various organic ***, the impacts of heavy metals on antibiotic resistance in the BSFL guts are poorly ***, we investigated the effect of copper(exposure concentrations of 0, 100 and 800 mg/kg) on the antibiotic and metal resistance profiles in BSFL guts.A total of 83 antibiotic resistance genes(ARGs), 18 mobile genetic elements(MGEs) and 6 metal resistance genes(MRGs) were observed in larval gut *** to Cu remarkably reduced the diversity of ARGs and MGEs, but significantly enhanced the abundances of gut-associated ARGs and *** levels of MRGs copA, czcA and pbrT were dramatically strengthened after Cu exposure as compared with CK(increased by 2.8–13.5 times).Genera Enterococcus acted as the most predominant potential host of multiple ARG, MGE and MRG ***, high exposure to Cu aggravated the enrichment of potential pathogens in BSFL guts, especially for Escherichia, Enterococcus and Salmonella *** mantel test and procrustes analysis revealed that the gut microbial communities could be a key determinant for antibiotic and metal ***, no significant positive links were observed between MGEs and ARGs or MRGs, possibly suggesting that MGEs did not play a crucial role in shaping the ARGs or MRGs in BSFL guts under the stress of *** findings extend our understanding on the impact of heavy metals on the gut-associated antibiotic and metal resistome of BSFL.

关键词： Black soldier fly Gut microbiome Antibiotic resistance Pathogen Heavy metals

Stabilization or degradation?Post-translational modifications of JAZ proteins in plants

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Molecular Plant 2024年第7期17卷 1002-1004页

作者： xiaoyan xu Jianping Hu Zheng Yuan Joint International Research Laboratory of Metabolic&Developmental Sciences School of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghai200240China Department of Energy Plant Research Laboratory and Plant Biology Department Michigan State UniversityEast LansingMI 48824USA

Jasmonates(JAs)are essential hormones that regulate plant responses to biotic and abiotic stresses and are involved in various developmental processes,including flowering time control,floral organ development,and fertility of male and female gametes(Howe et al.,2018).However,our understanding of the mechanisms by which JAs integrate multiple signals to regulate diverse physiological processes remains *** the canonical JA signaling pathway,activated JAs are perceived by the F-box protein receptor CORONATINE INSENSITIVE 1(COl1),which induces the interaction between COl1 and the Jas domain of the repressor proteins JASMONATE-ZIM DOMAIN PROTEINs(JAZs),leading to the ubiquitination and degradation of JAZ *** proteolytic destruction of the JAZ repressors is a crucial step that releases the inhibition of JAZs on the JA response transcription factor MYC2,allowing MYC2 to activate the expression of downstream genes(Howe et al.,2018).Therefore,the stability and specific spatiotemporal expression pattern of the JAZ proteins are critical for the regulation of JA signaling output,as they determine the activation and repression of JA responses.

关键词： translational fertility release

Operculum of a Water Snail is a Hydrodynamic Lubrication Sheet

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Journal of Bionic Engineering 2018年第3期15卷 471-480页

作者： xiaoyan xu Jianing Wu Yunqiang Yang Rengao Zhu Shaoze Yan School of Engineering and Technology China University of Geosciences (Beijing) Beijing 100083 China Division of Intelligent and Biomechanical Systems State Key Laboratory of Tribology Tsinghua University Beijing 100084 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

Water snails developed a distinct appendage, the operculum, to better protect the body against predators. When the animal is active and crawling, part of the underside of the shell rests on the outer surface of the operculum. We observed the water snails （Pomacea canaliculata） spend -3 hours per day foraging, and the relative angular velocity between the shell and operculum can reach up to 10°·s^-1, which might inevitably lead to abrasion on the shell and operculum interface. However, by electron microscopy images, we found that the underside of the shell and outer surface of the operculum is not severely worn, which indicates that this animal might have a strategy to reduce wear. We discovered the superimposed rings distributed concentrically on the surface, which can generate micro-grooves for a hydrodynamic lubrication. We theoretically and experimentally revealed the mechanism of drag reduction combing the groove geometry and hydrodynamics. This textured operculum surface might provide a friction coefficient up to 0.012 as a stability-resilience, which protects the structure of the snail＇s shell and operculum. This mechanism might open up new paths for studies of micro-anti-wear structures used in liquid media.

关键词： water snails operculum micro-grooves friction reduction biomaterial

Adsorption properties of the double-imprinted electrospun crosslinked chitosan nanofibers

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Chinese Chemical Letters 2019年第3期30卷 762-766页

作者： Yan Li Mengqi Li Jie Zhang xiaoyan xu School of Materials Science and Engineering Tongji University Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic Chemistry Chinese Academy of Sciences

The adsorption properties of the Pb(Ⅱ)-Cd(Ⅱ) double-imprinted electrospun crosslinked chitosan nanofibers(Pd/Cd-DIECCNs) prepared by electropspinning and imprinting process for the removal of Pb(Ⅱ) and Cd(Ⅱ) from aqueous solutions were investigated. The prepared nanofibers were characterized by scanning electron microscope(SEM) analysis. Under the optimum experimental conditions, the minimum fiber average diameter was obtained 110 nm. Then the adsorption experiments were carried out to study the effect of different adsorption parameters, such as pH, the ratio between Pb(Ⅱ) and Cd(Ⅱ)in the mixed solutions, contact time, the Pd/Cd-DIECCNs dose and temperature in a batch system. The Extended Langmuir model was applied to describe the equilibrium data of Pb(Ⅱ) and Cd(Ⅱ). The maximum adsorption capacities of the Pd/Cd-DIECCNs arrived at 567 mg/g for Pb(Ⅱ) and 341 mg/g for Cd(Ⅱ), respectively.

关键词： Chitosan Double imprinted Crosslinked Electrospun Adsorption

Density Dependence of Tunnel Fire Resistance for Aerogel-Cement Mortar Coatings

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Journal of Wuhan University of Technology(Materials Science) 2020年第3期35卷 598-604页

作者： ZHU Pinghua JIA Zhi WANG Xinjie CHEN Chunhong LIU Hui xu xiaoyan Department of Civil Engineering Changzhou UniversityChangzhou 213164China

Five kinds of mortars with density grades of 500, 600, 700, 800, and 900 kg/m3 were prepared. Their thermal conductivity and compressive strength were measured, and the morphological changes before and after simulated tunnel fire were observed. To investigate the fire resistance, the interfacial temperature of a 30 mm thick aerogel-cement mortar and self-compacting concrete (SCC) in a simulated tunnel fire with the maximum temperature of 1100 ℃ for 2.5 h was tested and recorded. The results showed that as the density decreased, both compressive strength and thermal conductivity of the aerogel-cement mortar exhibited an exponential decrease. The effective fire resistance time of the mortar with 500, 600, 700, 800, and 900 kg/m^3 for protecting SCC from tunnel fire were 97 min, 114 min, 144 min, > 150 min, 136 min, respectively. 700 - 800 kg/m3 was the optimum density for engineering application of tunnel concrete fireproof coating.

关键词： aerogel-cement mortar coating density grades compressive strength thermal conductivity simulated tunnel fire resistance