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Pricing Decision of e-commerce Supply chains with Return and Online Review of Product Quality

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Journal of Systems Science and Information 2023年第4期11卷 405-426页

作者： Yuyan WANG Luping DING t.c.e.cheng Dexia WANG School of Management Science and engineering Shandong University of Finance and EconomicsJinan 250014China Poly U Business School The Hong Kong Polytechnic UniversityHong Kong 999077China

the online review function helps consumers grasp more real product information and reduce the possibility of returning, but it may also damage firms’ reputations or profits. However, few studies considered the relationship between online reviews and consumer returns. Based on this, we develop an e-commerce supply chain(e-Sc) game model consisting of a single manufacturer and a single e-platform, aiming to explore the relationship between consumer returns and online reviews and to analyze the impact on both the decision-making of e-Sc members and their profits. We find that there is a negative relationship between consumer returns and online reviews of product quality, and consumer returns make the pricing decisions in the two scenarios of yes/no online reviews move toward two different directions. Only when the online review is positive and higher than a certain threshold will it have a positive impact on sales and e-Sc members’ profits. Finally, we design a new “commission joint returns and quality improvement costs sharing” contract to optimize the decentralized model with online reviews, and we find that the higher the accuracy of product information, the less conducive the contract applied to e-Sc.

关键词： e-commerce supply chains pricing decision consumer returns online review

extreme tenacity of Graphs with Given Order and Size

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Journal of the Operations Research Society of china 2014年第3期2卷 307-315页

作者： t.c.e.cheng Yin-Kui Li chuan-Dong Xu Sheng-Gui Zhang Department of Logistics and Maritime Studies The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina School of Mathematics and Statistics Qinghai University for NationalitiesXining 810000QinghaiChina Department of Applied Mathematics Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina State Key Laboratory for Manufacturing Systems engineering Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina

computer or communication networks are so designed that they do not easily get disrupted under external attack and,moreover,these are easily reconstructible if they do get *** desirable properties of networks can be measured by various graph parameters,such as connectivity,toughness,scattering number,integrity,tenacity,rupture degree and edge-analogues of some of *** these parameters,the tenacity and rupture degree are two better ones to measure the stability of a *** this paper,we consider two extremal problems on the tenacity of graphs:determine the minimum and maximum tenacity of graphs with given order and *** give a complete solution to the first problem,while for the second one,it turns out that the problem is much more complicated than that of the minimum *** determine the maximum tenacity of trees with given order and show the corresponding extremal *** paper concludes with a discussion of a related problem on the edge vulnerability parameters of graphs.

关键词： Vulnerability parameters Minimum tenacity Maximum tenacity trees

How do Normal traders and Sharp traders Make Profits in the chinese Security Market?

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Journal of Systems Science and Systems engineering 2020年第2期29卷 203-234页

作者： Mingyang Zhang Juliang Zhang tcecheng Guowei Hua Department of Management Science and engineering School of Economics and ManagementBeijing Forestry UniversityBeijing 100083China Department of Management Science and engineering School of Economics and ManagementBeijing Jiaotong UniversityBeijing 100044China Department of Logistics and Maritime Studies The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SAR

In this paper,we consider the strategic interaction between the normal and sharp traders in a dynamic limit-order security market and its impact on the chinese security market at different market volatility *** find that when the proportion of sharp traders is less than a threshold in an orderdriven market,the sharp traders who submit limit orders will get more returns than the normal *** participation of sharp traders in the market can increase the total social welfare of all the *** addition,we show that:(1)when the market volatility level is generally low,the short-term sharp traders benefit from larger volatility;(2)when the market volatility level is generally high,the insider/cheating sharp traders with high-frequent trading rather than the short-term sharp traders benefit from extreme high volatility;(3)when the market volatility level is moderate,the sharp traders can increase market liquidity.

关键词： Sharp trader order-driven market limit-order strategic interaction

t cell interactions with microglia in immune-inflammatory processes of ischemic stroke

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Neural Regeneration Research 2025年第5期20卷 1277-1292页

作者： Yuxiao Zheng Zilin Ren Ying Liu Juntang Yan congai chen Yanhui He Yuyu Shi Fafeng cheng Qingguo Wang changxiang Li Xueqian Wang School of traditional chinese Medicine Beijing University of Chinese MedicineBeijingChina Library Beijing University of Chinese MedicineBeijingChina Dongzhimen Hospital Beijing University of Chinese MedicineBeijingChina

the primary mechanism of secondary injury after cerebral ischemia may be the brain inflammation that emerges after an ischemic stroke,which promotes neuronal death and inhibits nerve tissue *** the first immune cells to be activated after an ischemic stroke,microglia play an important immunomodulatory role in the progression of the *** an ischemic stroke,peripheral blood immune cells(mainly t cells)are recruited to the central nervous system by chemokines secreted by immune cells in the brain,where they interact with central nervous system cells(mainly microglia)to trigger a secondary neuroimmune *** review summarizes the interactions between t cells and microglia in the immune-inflammatory processes of ischemic *** found that,during ischemic stroke,t cells and microglia demonstrate a more pronounced synergistic ***1,th17,and M1 microglia can co-secrete proinflammatory factors,such as interferon-γ,tumor necrosis factor-α,and interleukin-1β,to promote neuroinflammation and exacerbate brain ***2,treg,and M2 microglia jointly secrete anti-inflammatory factors,such as interleukin-4,interleukin-10,and transforming growth factor-β,to inhibit the progression of neuroinflammation,as well as growth factors such as brain-derived neurotrophic factor to promote nerve regeneration and repair brain *** interactions between microglia and t cells influence the direction of the subsequent neuroinflammation,which in turn determines the prognosis of ischemic stroke *** trials have been conducted on the ways to modulate the interactions between t cells and microglia toward anti-inflammatory communication using the immunosuppressant fingolimod or overdosing with treg cells to promote neural tissue repair and reduce the damage caused by ischemic ***,such studies have been relatively infrequent,and clinical experience is still *** summary,in ischemic stroke,t cell subsets and activated micro

关键词： brain immune inflammation interaction ischemic stroke mechanism microglia neuron secondary injury t cells

“Zero‑Strain” NiNb_(2)O_(6) Fibers for All‑climate Lithium Storage

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Nano-Micro Letters 2025年第1期17卷 348-360页

作者： Yan Zhao Qiang Yuan Liting Yang Guisheng Liang Yifeng cheng Limin Wu chunfu Lin Renchao che college of Physics Donghua UniversityShanghai 201620People’s Republic of China School of Materials Science and engineering Institute of Materials for Energy and EnvironmentQingdao UniversityQingdao 266071People’s Republic of China Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438People’s Republic of China Zhejiang Laboratory Hangzhou 311100People’s Republic of China Inner Mongolia University Hohhot 010021People’s Republic of China

Niobates are promising all-climate Li^(+)-storage anode material due to their fast charge transport,large specific capacities,and resistance to electrolyte ***,their moderate unit-cellvolume expansion(generally 5%–10%)during Li^(+)storage causes unsatisfactory long-term ***,“zero-strain”NiNb_(2)O_(6) fibers are explored as a new anode material with comprehensively good electrochemical *** Li^(+)storage,the expansion of electrochemical inactive NiO_(6) octahedra almost fully offsets the shrinkage of active NbO_(6) octahedra through reversible O *** superior volume-accommodation capability of the NiO_(6) layers guarantees the“zero-strain”behavior of NiNb_(2)O_(6) in a broad temperature range(0.53%//0.51%//0.74%at 25//−10//60℃),leading to the excellent cyclability of the NiNb_(2)O_(6) fibers(92.8%//99.2%//91.1%capacity retention after 1000//2000//1000 cycles at 10c and 25//−10//60℃).this NiNb_(2)O_(6) material further exhibits a large reversible capacity(300//184//318 mAh g−1 at 0.1c and 25//−10//60℃)and outstanding rate performance(10 to 0.5c capacity percentage of 64.3%//50.0%//65.4%at 25//−10//60℃).therefore,the NiNb_(2)O_(6) fibers are especially suitable for large-capacity,fast-charging,long-life,and all-climate lithium-ion batteries.

关键词： NiNb_(2)O_(6)porous fiber “Zero-strain”mechanism electrochemical property Harsh-temperature operation Operando characterization

Spontaneous Orientation Polarization of Anisotropic equivalent Dipoles Harnessed by entropy engineering for Ultra‑thin electromagnetic Wave Absorber

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Nano-Micro Letters 2025年第1期17卷 424-438页

作者： Honghan Wang Xinyu Xiao Shangru Zhai chuang Xue Guangping Zheng Deqing Zhang Renchao che Junye cheng Liaoning Key Lab of Lignocellulose chemistry and BioMaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefinerySchool of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034People’s Republic of China School of Life Science and Biotechnology Dalian University of TechnologyDalian 116024People’s Republic of China Department of Mechanical engineering Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077People’s Republic of China School of Materials Science and engineering Qiqihar UniversityQiqihar 161006People’s Republic of China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438People’s Republic of China Department of Materials Science Shenzhen MSU-BIT UniversityShenzhen 517182People’s Republic of China

the synthesis of carbon supporter/nanoscale high-entropy alloys(HeAs)electromagnetic response composites by carbothermal shock method has been identified as an advanced strategy for the collaborative competition engineering of conductive/dielectric *** migration modes within HeAs as manipulated by the electronegativity,valence electron configurations and molar proportions of constituent elements determine the steady state and efficiency of equivalent ***,enlightened by skin-like effect,a reformative carbothermal shock method using carbonized cellulose paper(ccP)as carbon supporter is used to preserve the oxygencontaining functional groups(O·)of carbonized cellulose fibers(ccF).Nucleation of HeAs and construction of emblematic shell-core ccF/HeAs heterointerfaces are inextricably linked to carbon metabolism induced by O·.Meanwhile,the electron migration mode of switchable electronrich sites promotes the orientation polarization of anisotropic equivalent *** virtue of the reinforcement strategy,ccP/HeAs composite prepared by 35%molar ratio of Mn element(ccP/HeAs-Mn_(2.15))achieves efficient electromagnetic wave(eMW)absorption of−51.35 dB at an ultra-thin thickness of 1.03 *** mechanisms of the resulting dielectric properties of HeAs-based eMW absorbing materials are elucidated by combining theoretical calculations with experimental characterizations,which provide theoretical bases and feasible strategies for the simulation and practical application of electromagnetic functional devices(e.g.,ultra-wideband bandpass filter).

关键词： High-entropy alloys carbothermal shock Switchable electron migration modes emblematic shell-core heterointerfaces Ultra-thin thickness

Bounds on the clique-transversal number of regular graphs

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Science china Mathematics 2008年第5期51卷 851-863页

作者： cheng t.c.e Department of Logistics the Hong Kong Polytechnic University

A clique-transversal set D of a graph G is a set of vertices of G such that D meets all cliques of G. the clique-transversal number, denoted τ c (G), is the minimum cardinality of a clique-transversal set in G. In this paper we present the bounds on the clique-transversal number for regular graphs and characterize the extremal graphs achieving the lower bound. Also, we give the sharp bounds on the clique-transversal number for claw-free cubic graphs and we characterize the extremal graphs achieving the lower bound.

关键词： graph regular graph claw-free cubic graph clique-transversal set clique-transversal number 05c65 05c69 05c75

Gradient‑Layered MXene/Hollow Lignin Nanospheres Architecture Design for Flexible and Stretchable Supercapacitors

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Nano-Micro Letters 2025年第2期17卷 447-462页

作者： Haonan Zhang cheng Hao tongtong Fu Dian Yu Jane Howe Kaiwen chen Ning Yan Hao Ren Huamin Zhai Jiangsu Provincial Key Lab of Sustainable Pulp and Paper technology and Biomass Materials NanJing Forestry UniversityNanjing 210037People’s Republic of China Department of chemical engineering and Applied chemistry University of Toronto200 College StreetTorontoON M5S 3E5Canada Department of Materials Science and engineering University of Toronto184 College StreetTorontoON M5S 3E4Canada college of Materials Science and engineering Nanjing Forestry UniversityNanjing 210037People’s Republic of China

With the rapid development of flexible wearable electronics,the demand for stretchable energy storage devices has *** this work,a novel gradient-layered architecture was design based on single-pore hollow lignin nanospheres(HLNPs)-intercalated two-dimensional transition metal carbide(ti_(3)c_(2)t_(x) MXene)for fabricating highly stretchable and durable *** depositing and inserting HLNPs in the MXene layers with a bottom-up decreasing gradient,a multilayered porous MXene structure with smooth ion channels was constructed by reducing the overstacking of MXene ***,the micro-chamber architecture of thin-walled lignin nanospheres effectively extended the contact area between lignin and MXene to improve ion and electron accessibility,thus better utilizing the pseudocapacitive property of *** these strategies effectively enhanced the capacitive performance of the *** addition,HLNPs,which acted as a protective phase for MXene layer,enhanced mechanical properties of the wrinkled stretchable electrodes by releasing stress through slip and deformation during the stretch-release cycling and greatly improved the structural integrity and capacitive stability of the *** electrodes and symmetric flexible all-solid-state supercapacitors capable of enduring 600%uniaxial tensile strain were developed with high specific capacitances of 1273 mF cm^(−2)(241 F g^(−1))and 514 mF cm^(−2)(95 F g^(−1)),***,their capacitances were well preserved after 1000 times of 600%stretch-release *** study showcased new possibilities of incorporating biobased lignin nanospheres in energy storage devices to fabricate stretchable devices leveraging synergies among various two-dimensional nanomaterials.

关键词： Hollow lignin nanospheres MXene Gradient-layered architecture Wrinkled electrodes Stretchable supercapacitors

Free vibration and transient response of double curved beams connected by intermediate straight beams

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Applied Mathematics and Mechanics(english edition) 2025年第1期46卷 37-62页

作者： R.A.JAFARI-tALOOKOLAeI H.GHANDVAR e.JUMAeV S.KHAtIR t.cUONG-Le School of Mechanical engineering Babol Noshirvani University of Technology Department of Mechanical engineering Faculty of Engineering New Uzbekistan University University of Business and Science center for engineering Application and technology Solutions Ho Chi Minh City Open University

this paper investigates the free vibration and transient response of interconnected structures including double curved beams and intermediate straight beams,which are all constructed from functionally graded porous(FGP) materials. the strain potential and kinetic energies of each beam along with the work done by the external force are calculated. Additionally, a higher-order beam element is introduced to derive stiffness and mass matrices, along with the force vector. the curved and straight beams are discretized, and their assembled stiffness, mass matrices, and force vectors, are *** conditions at the joints are used to derive the total matrices of the entire structure. Subsequently, the natural frequencies and transient response of the system are determined. the accuracy of the mathematical model and the self-developed computer program is validated through the comparison of the obtained results with those of the existing literature and commercial software ANSYS, demonstrating excellent ***, a comprehensive study is conducted to investigate the effects of various parameters on the free vibration and transient response of the considered structure.

关键词： Kinetic energy