Markov Chain Modelling of Reliability Analysis and Prediction under Mixed Mode Loading

The reliability assessment for an automobile crankshaft provides an important understanding in dealing with the design life of the component in order to eliminate or reduce the likelihood of failure and safety risks.The failures of the crankshafts are considered as a catastrophic failure that leads towards a severe failure of the engine block and its other connecting subcomponents.The reliability of an automotive crankshaft under mixed mode loading using the Markov Chain Model is studied.The Markov Chain is modelled by using a two-state condition to represent the bending and torsion loads that would occur on the crankshaft.The automotive crankshaft represents a good case study of a component under mixed mode loading due to the rotating bending and torsion stresses.An estimation of the Weibull shape parameter is used to obtain the probability density function,cumulative distribution function,hazard and reliability rate functions,the bathtub curve and the mean time to failure.The various properties of the shape parameter is used to model the failure characteristic through the bathtub curve is shown.Likewise,an understanding of the patterns posed by the hazard rate onto the component can be used to improve the design and increase the life cycle based on the reliability and dependability of the component.The proposed reliability assessment provides an accurate,efficient,fast and cost effective reliability analysis in contrast to costly and lengthy experimental techniques.

The Architecture and Operation Mode of Virtual Supply Chain

Virtual supply chain, as a modern collaborative mode of enterprises, is important to decrease the cost and improve the efficiency and the quality of supply chains, and to satisfy customers. Based on the analysis of the conception and characteristics of the virtual supply chain, the architecture of virtual supply chain is built, and corresponding objects, tasks, information and technologies are described. Three operation modes-Order-driven, manufacturer-centered, and retailer-centered are researched. As a case, virtual supply chain is applied in the electronic commerce and networked customization system of ceramic products.

Coupling of Cutoff Modes in a Chain of Nonlinear Metallic Nanorods

We study the coupling of cutoff modes in a chain of metallic nanorods embedded in a Kerr nonlinear optical medium with strong near-field interactions analytically. Based on a quasidiscreteness approach, we derive a system of two coupled nonlinear Schrbdinger equations governing the evolution of the envelopes of these modes. It is shown that this system supports a variety of subwavelength plasmonic lattice vector solitons of the bright- bright, bright-dark, dark-bright, and dark-dark type through a cross-phase modulation. It is also shown that the existence of different solitons depends strongly on the gap width scaled for the rod radius and the type of nonlinearity of the embedded medium.

Identifying the dependency pattern of daily rainfall of Dhaka station in Bangladesh using Markov chain and logistic regression model

Bangladesh is a subtropical monsoon climate characterized by wide seasonal variations in rainfall, moderately warm temperatures, and high humidity. Rainfall is the main source of irrigation water everywhere in the Bangladesh where the inhabitants derive their income primarily from farming. Stochastic rainfall models were concerned with the occurrence of wet day and depth of rainfall for different regions to model the daily occurrence of rainfall and achieved satisfactory results around the world. In connection to the Markov chain of different order, logistic regression is conducted to visualize the dependence of current rainfall upon the rainfall of previous two-time period. It had been shown that wet day of the previous two time period compared to the dry day of previous two time period influences positively the wet day of current time period, that is the dependency of dry-wet spell for the occurrence of rain in the rainy season from April to September in the study area. Daily data are collected from meteorological department of about 26 years on rainfall of Dhaka station during the period January 1985-August 2011 to conduct the study. The test result shows that the occurrence of rainfall follows a second order Markov chain and logistic regression also tells that dry followed by dry and wet followed by wet is more likely for the rainfall of Dhaka station and also the model could perform adequately for many applications of rainfall data satisfactorily.

Bright and dark small amplitude nonlinear localized modes in a quantum one-dimensional Klein-Gordon chain

By means of the Glauber＇s coherent state method combined with multiple-scale method, this paper investigates the localized modes in a quantum one-dimensional Klein-Gordon chain and finds that the equation of motion of annihilation operator is reduced to the nonlinear Schroedinger equation. Interestingly, the model can support both bright and dark small amplitude travelling and non-travelling nonlinear localized modes in different parameter spaces.

Effect of Interaction on the Majorana Zero Modes in the Kitaev Chain at Half Filling

The one-dimensional interacting Kitaev chain at half filling is studied. The symmetry of the Hamiltonian is examined by dual transformations, and various physical quantities as a function of the fermion-fermion interaction U are calculated systematically using the density matrix renormalization group method. A special value of interaction Up is revealed in the topological region of the phase diagram. We show that at Up the ground states are strictly two-fold degenerate even though the chain length is finite and the zero-energy peak due to the Majorana zero modes is maximally enhanced and exactly localized at the end sites. Here Up may be attractive or repulsive depending on other system parameters. We also give a qualitative understanding of the effect of interaction under the self-consistent mean field framework.

Identifying E-Business Model: A Value Chain-Based Analysis

E-business will change the ways that all companies do business, and most traditional businesses will evolve from their current business model to a combination of place and space via e-business model. To choose the proper e-business model becomes the important strategic concern for company to succeed. The main objective of this paper is to investigate the analysis framework for identifying e-business model. Based on the e-business process, from the value chain to the value net perspective. This paper provides a theoretical framework for identifying e-business models, and results in 11 e-business models. The strategic intend of every e-business model is discussed in the end of this paper. An enterprise e-business model design and implementation can be specified by the combination of one or more among 11 e-business models.

Solitons and intrinsic localized modes in a one-dimensional antiferromagnetic chain

By use of the Hartree approximation and the method of multiple scales, we investigate quantum solitons and intrinsic localized modes in a one-dimensional antiferromagnetic chain. It is shown that there exist solitons of two different quantum frequency bands： i.e., magnetic optical solitons and acoustic solitons. At the boundary of the Brillouin zone, these solitons becornc quantum intrinsic localized modes： their quantum eigenfrequencics are below the bottom of the harmonic optical frequency band and above the top of the harmonic acoustic frequency band.

Explicit forms of zero modes in symmetric interacting Kitaev chain without and with dimerization

The fermionic and bosonic zero modes of the one-dimensional（1D） interacting Kitaev chain at the symmetric point are unveiled. The many-body structures of the Majorana zero modes in the topological region are given explicitly by carrying out a perturbation expansion up to infinite order. We also give the analytic expressions of the bosonic zero modes in the topologically trivial phase. Our results are generalized to the hybrid fermion system comprised of the interacting Kitaev model and the Su–Schrieffer–Heeger（SSH） model, in which we show that these two types of zero modes can coexist in a certain region of its phase diagram.

碳中和背景下能源动力专业人才基本素养新特质研究

2021年,教育部发布的《高等学校碳中和科技创新行动计划》中强调“加快制定碳中和领域人才培养方案”。这是碳中和背景下,支撑和推进我国能源革命进程,建设清洁低碳、安全高效能源体系的重点学科领域。明确碳中和背景下,能源动力专业人才基本素养的新要素、新特质,是构建各级培养目标、逆向制定培养方案、设置课程、深入教学过程改革,实现自主培养高质量人才的依据和逻辑起点。

以国防素养为导向的“三环三链”高校国防教育模式再探讨

以提升大学生国防素养为导向,建“三环”、通“三链”,打造“三环三链”大学生国防教育模式,是加强和改进新时代高校国防教育的可行路径。将国防课程教学作为高校国防教育的主渠道,将国防实践活动作为高校国防教育的主战场,将国防宣传教育作为高校国防教育的主窗口。开发丰富、多样、互补的国防教育“资源链”,驱动“课程环”建设;激活军地校协作、师生紧密配合、校内校外联动的国防教育“协同链”,保障“实践环”建设;畅通多维宣传模块、多元宣传载体、多种技术支撑的国防教育“信息链”,赋能“宣传环”建设。

我国电子竞技发展的现实机遇、推进困境及培育路径——基于拳头公司及旗下游戏的实践经验

运用文献资料、逻辑分析、案例分析等方法,探究我国电子竞技(以下简称“电竞”)发展的现实机遇、发展困境,通过对拳头公司及旗下游戏的分析总结,为我国电竞的发展提出培育路径。当下我国电竞在政策、国际环境、市场、技术等因素的驱动下快速发展,但在发展过程中暴露出电竞人才供给不足、电竞产业链不完善、国内国际传播受限等问题,通过对拳头公司及两款游戏进行分析后得出:政策支持为电竞发展保驾护航,多渠道助力电竞人才培养,构建具有强大自我造血能力的电竞产业生态,多途径扩大电竞社会影响力。基于此对我国电竞的发展提出对策:注重政策研究,加强行业监管,优化电竞发展的外部环境;完善培养体系,拓宽电竞人才来源,为电竞发展提供人才保障;提高创新能力,完善电竞产业链,增强电竞发展内生动力;发扬本土电竞文化,挖掘电竞社会价值,促进电竞国内国际双向传播,以此推动我国电竞实现高质量发展,助力我国体育强国建设。

我国企业国际竞争优势生成逻辑及形成路径研究

企业在深化国际合作过程中,强有力的竞争优势是其不可或缺的重要依托。基于此,企业首先可从所处的产业、所处的竞争环境以及产品的定位三方面对自身的竞争优势进行判断,分析出自身竞争优势产生的底层逻辑。然后,从全球化战略、战略联盟和规模经济三方面探讨本企业实现竞争优势的可选模式。最后,通过竞争力的供应链价值导向、竞争力的范围适应面和竞争力的持续保持对其自身国际竞争力的形成路径进行梳理,以期找到合适的实现路径。

基于Blockchain的新能源汽车动力电池回收供应链模式

构建高效的动力电池回收网络对新能源汽车产业发展具有重要的作用。考虑到动力电池回收网络的供应链运营特征,首先,应用扎根理论对传统回收模式下新能源汽车动力电池回收溯源管理中存在的回收主体间协调、回收信息溯源和回收过程监管等技术需求,与区块链分布式记账、共识机制、智能合约等技术特性之间的关系进行分析;其次,分析区块链技术下回收主体间信息共享和回收信息网络化传递的可行路径,构建由基础层(回收信息流数据存储)、核心层(回收信息共享传递)和应用层(回收参与方协作)构成的回收供应链信息平台模型;再次,搭建基于区块链的新能源汽车动力电池回收供应链体系框架,分析电池生产商主导(BML)、整车生产企业主导(VML)、生产商联合体主导(MAL)和第三方主导(TPL)等四种回收供应链模式的特点;最后,通过构建DEA模型对回收效率进行实证分析和量化评价。研究表明,区块链技术下的回收供应链模式其效率高于传统回收模式,且MAL模式和TPL模式下的回收效率最高,BML模式和VML模式下的回收效率则次之。研究结论为企业应用区块链技术进行新能源汽车动力电池回收网络构建与回收运营决策优化提供参考。

基于CIPP评价模式的《供应链战略管理》课程建设研究——以成都信息工程大学为例

文章探究《供应链战略管理》课程建设内容,为优化课程建设提供科学参考。基于CIPP评价模式提炼评价因子,运用层次分析法确定各因素的权重,利用成都信息工程大学《供应链战略管理》课程做实证研究,最终得到课程评价结果。《供应链战略管理》应从背景知识输入、课程资源优化设置、校企师资综合整合方面完善课程建设内容,为企业培养针对性人才。

Operating Analysis of the Closed Supply Chain of Green Agricultural Products Based on Logistics Center

This thesis gives the overview of concept and constitution of the closed supply chain of green agricultural products based on logistics center,and the necessity of regarding logistics center as core enterprise.Meanwhile,it analyzes the function of logistics center of agricultural products,namely functions of exchange,collection,distribution,storage and transportation.It also poses the prerequisites of logistics center.The logistics center of agricultural products must have stable profit expectancy,prominent scale,strong appealing power,capacity of bearing market risk and basic thoughts of supply chain management.The functional design of the closed supply chain of green agricultural products has been discussed in 5 aspects,namely logistics center,production base,providers of means of production,retailer and consumer.The operating thoughts of the closed supply chain of green agricultural products based on logistics center are put forward on the basis of the research of operating objective and service target of supply chain as follows:first,based on local principal agricultural products,the logistics center mainly distributes the massed agricultural products;second,it is necessary to choose appropriate strategic cooperative partners to sign contract;third,the operating procedure of supply chain entails bringing in professional managerial talents of supply chain;finally,the relationships of supply chain should be maintained.

A novel chain-extended urea containing hyperbranched polymer used as toughening modifier for epoxy resin

A new kind of reactive toughening accelerator for epoxy resin, amine-teminated hyperbranched polymer (H2O-NMe2) was synthesized and characterized by FT-IR spectroscopy. Dynamic mechanical analysis (DMA) was used to study the glass transition temperature (Tg), loss factor (tanδ) and activation energy (Ea) by using multiplexing frequency. The results show that the Ea at glassy relaxation process of modified system is about 70-80 kJ/mol higher than that of unmodified system, and the high modulus and good thermal properties are still maintained.

Cooperative Innovation in a Supply Chain with Different Market Power Structures

This paper studies firms’ innovation behavior in a supply chain where two firms first invest to reduce component’ cost according to different innovation modes (non-cooperative innovation, sequential innovation, and cooperative innovation) and then decide the prices according to different market powers (Supplier-Stackelberg, Manufacturer-Stackelberg, and Nash). We find that both the supplier and the manufacturer make more innovation efforts and profits under sequential innovation than under non-cooperative innovation when the market power is any one of three structures. Moreover, the firm prefers to invest as the follower in sequential innovation. We also show that the firms are easy to achieve cooperative innovation under symmetrical power market structure than asymmetrical power market structure. By using a concept named innovation-desirability-index that measures a firm’s desire to innovate in the supply chain, we show that it is optimal for a firm in the chain to cooperate with such a firm whose market power is close to his own if the innovation-desirability-index is higher, otherwise with such a firm whose market power is lower to his own.

Comparative Analysis on Farmers' Specialized Cooperatives from the Perspective of Agricultural Industry Chain

Taking three typical farmers' specialized cooperatives in Jingyuan County of Gansu Province as example,this paper compared with the operating mode of three cooperatives and their position in the agricultural industry chain,and analyzed operating characteristics,problems,and similarities of three cooperatives and their functions in the agricultural industry chain.The study indicated that the farmers' specialized cooperatives can accurately find their position in the agricultural industry chain.This is helpful for raising their comprehensive competitiveness and it is very important to manage the survival and development of farmers' specialized cooperatives,which is of utmost importance to their effective operation.According to this study,the government should strengthen its support,speed up the cultivation of new-type professional farmers,while farmers' specialized cooperatives should grasp the operating characteristics,locate themselves and integrate multi-resources.These are effective measures for promoting healthy operation of farmers' specialized cooperatives.

生鲜猪肉冷链物流管理中FMEA方法的应用研究

本文研究了故障模式和影响分析(Failure Mode and Effect Analysis,FMEA)方法在生鲜猪肉冷链物流管理中的应用。通过组建专家团队,建立风险评价准则,识别与评估潜在故障模式,发现冷却排酸等关键过程中存在高风险,说明FMEA方法可帮助企业量化风险程度,明确优先级,制订改进措施。建议加强温控设备维护、优化操作流程、建立供应商质量管理体系,并纳入常规管理流程,以提升冷链物流效率和安全性。