Research on Benefit Distribution Mechanism of Farmers’ Specialized Cooperative Economic Organization

On the basis of conducting survey in Jiaonan City,the thesis analyzes benefit distribution mechanism of farmers’ specialized cooperative economic organizations:firstly,the benefit correlation is mainly the contract correlation;secondly,the profit distribution is mainly the dividend;thirdly,patronage refund has many connotations;fourthly,the public accumulation has not yet been quantified to individual;fifthly,the government support capital is ill-defined.Based on these,the measures are put forward in order to improve benefit distribution pattern of farmers’ specialized cooperative economic organizations:firstly,reform structure of property rights and realize farmers’ ownership;secondly,change mode of decision-making,and realize farmers’ control;thirdly,increase turnover rebate and realize farmers’ benefiting;fourthly,quantify public accumulation and government support fund.

Dynamics of five-bar COBOT using differential mechanism

COBOT is a new kind of collaborative robot , which can work with people in a shared space. In this paper a new kind of CVT using differential mechanism is introduced, which is major parts of five-bar COBOT and based the feature of nonhlonnmic constraint. The dynamic model of differential mechanism and five-bar architecture COBOT is founded. There are two kinds of coupled mode of two CVT:serial and parallel. In this paper, we present the dynamic model of serial and parallel COBOT take five-bar COBOT as research object. From the dynamic analysis foregoing, both serial and parallel COBOT model are have the feature of nonholonomic constraint. The ending track and moving state are controlled by the force of control motor and operator. The control motor can not control the movement and ending track of COBOT without the cooperation of operator.

Recommendations for Optimizing Internal Management Mechanism of Farmers' Specialized Cooperatives

Based on the survey of 38 farmers' specialized cooperatives in Hubei Province,this paper analyzed existing problems in internal management mechanism of cooperatives,including widespread problem of centralized control,imperfect supervision mechanism,lack of effective incentive mechanism,insufficient specialized personnel,and limited participation of cooperative members in management. It elaborated causes for these problems from the perspective of practice. Finally,it came up with recommendations for optimizing farmers' specialized cooperatives: building democratic decision making mechanism with coordination of cooperative members and able personnel,establishing supervision mechanism suitable for self demands,improving internal incentive mechanism,establishing talent introduction and cultivation mechanism in proper time,and strengthening internal member management of cooperatives.

A New Design Method for Realizing Accurate Track of Hybrid-driven Five-bar Mechanism

The concept of virtual slider crank mechanism is proposed and decoupled to obtain parameters of controllable five bar mechanism without any principle error for any given trajectory. The model is simple and easy to solve. This method has no convergence,flexible workspace and singularity of the mechanism problem. Through this method,we don’ t need any curve to fit the trajectory point. Using MATLAB program to calculate,the computation time can be reduced to less than 3% of the original. Finally,an example is given to illustrate the method which is meanwhile compared with the traditional five bar design method.

Editorial: Special subject on the mechanical behavior of thermal protection materials and structures

The thermal protection materials and structures are widely used in hypersonic vehicles for the purpose of thermal insulation, and their mechanical behavior is one of the key issues in design and manufacture of hypersonic vehicles. It is our great pleasure to present the seven papers in this special subject of Theoretical ＆ Applied Mechanics Letters （TAML） and introduce the recent progresses on the mechanical behavior of thermal protection materials and structures by the authors.

Chinese Journal of Mechanical Engineering(CJME) Special Issue on ＂Machine Fault Diagnostics and Prognostics＂

Machine components and systems, such as gears, bearings, pipes, cutting tools and turbines, may experience various types of faults such as crack, pitting, wear, corrosion, etc. It is significant to detect these faults to prevent unexpected failures, and ensure equipment and product reliability, safety, quality and productivity. The aim of this special section on ＂Machine Fault Diagnostics and Prognostics＂ is to present new methods and tools for equipment condition monitoring and fault diagnosis, and equipment prognostics aiming at predicting fault propagation and remaining useful life. With accurate machine fault diagnostics and prognostics methods, effective maintenance and logistics activities can be scheduled to ensure equipment performance. Their applications in various industries will also be discussed, particularly manufacturing, energy, and aerospace industries.

Preface for Special Issue on“Key Mechanical Problems of Marine Energy Development Equipment”

There are abundant energy reserves such as oil,natural gas,hydrate,and wind energy in the ocean.Countries around the globe are competing to advance their marine energy development technologies.The exploitation of marine resources relies on cutting-edge industrial equipment.After decades of R&D endeavors,China has obtained most of the key technologies for the design,production,testing,and field application of marine energy development equipment(Xie and Zeng,2021).

Editorial: Special subject on the mechanical behavior of fire dynamics in high-rise buildings

With rapid economic and social development in China, high-rise buildings have continuously sprung up since 2006. However, several big fire accidents in high-rise buildings such as the Beijing Television Cultural Center fire in 2009 and the Shanghai Jing＇an District fire in 2010 etc. have claimed people＇s lives and caused huge amounts of economic and property losses,

Quantum Mechanics and Special Relativity:The Origin of Momentum Operator

The free relativistic particle, by definition, has to move in an inertial reference frame with uniform velocity less than the speed of light. The corresponding movement of a material quantum particle describes a wave packet, composed of matter waves—solutions of the Schr?dinger equation. The maximum of packet, corresponding to the largest probability to find the particle, has to move with the same uniform velocity, defined by the initial condition. It has been shown that the traditional definition of the quantum momentum operator i.e. taking it to correspond to the special relativity theory, relativistic momentum, cannot produce precise description of a relativistic matter particle. Different definitions are investigated and one that solves this issue is found. Obtained original expression of relativistic kinetic energy operator creates new possibilities for relativistic quantum systems theory.

Exploration and Practice of Personnel Cultivation for Agricultural Mechanization and Automation Specialities

Firstly, based on significance of developing agricultural mechanization and automation and current situations of agricultural mechanization and automation specialities in colleges and universities, we put forward objectives of personnel cultivation for agricultural mechanization and automation specialities. Then, we analyze the exploration and practice of personnel cultivation for agricultural mechanization and automation specialities from four aspects, including course system setting, teaching materials construction, laboratory construction, and construction of practical teaching link. Finally, it is expected to provide references for running schools and cultivating excellent professional personnel.

On the Existence of a Minimum Universal Speed of Physical Transmissions Associated with Matter Wave in Special Relativity

In this work, we show that it is possible to establish coordinate transformations between inertial reference frames in the theory of special relativity with a minimum universal speed of physical transmissions. The established coordinate transformations, referred to as modified Lorentz transformations because they have almost identical form to the Lorentz transformations, also comply with the requirement of invariance of the Minkowski line element. Particularly, the minimum universal speed can be associated with the phase speed of de Broglie matter wave. As application, we also discuss the possibility to formulate relativistic classical and quantum mechanics for the special relativity associated with the modified Lorentz transformations, which describes physical processes that represent an expansion or a collapsing of massive quantum particles.

京津冀城市群产业链分工格局、机制与发展方向

区域产业分工历经从部门间分工向部门内分工再到产业链分工为主的形式演进,产业链分工表现为功能专业化。以功能专业化指数为基础,运用区位商对京津冀城市群产业链分工进行测度,结果表明:京津冀城市群中心城市与外围城市功能性分工显著,形成中心城市主要承担生产性服务功能,外围城市主要承担生产制造功能的分工格局。其生产性服务功能呈现明显的单中心集聚趋势,各城市优势产业突出。市场需求的多样化、交易成本的降低、城市间密切的经济联系,以及便捷的交通联系会促进京津冀产业链分工的形成与发展。未来京津冀应形成超大城市、特大城市、大城市、中小城市和县城特色突出、功能各异、协调发展的产业链分工体系。

能源技术进步与区域专业化——特高压输电工程的视角

基于2003—2020年中国285个地级市数据,以特高压输电工程为切入点,研究能源技术进步对区域专业化的影响及作用机制。结果显示:以特高压输电技术为代表的能源技术进步显著提升了区域专业化水平,具体而言,较没有特高压输电项目城市,配备特高压输电工程城市的专业化水平提升约1.09%,且该效应在中小城市、资源丰富城市和内陆地区更强;在考虑样本选择偏差、基期分工水平、调整指标测度、剔除极端值并进行安慰剂检验和倾向得分匹配后,该结果依然稳健;进一步的机制分析表明,特高压建设所表征的能源技术进步通过激发资源禀赋的比较优势、生产的集聚效应来促进地区专业化。继续扩大特高压输电规模,合理实施区域专业化,互通有无、取长补短,对促进区域协调发展具有重要意义。

冻结立井井筒机械化掘进现状及发展趋势

针对我国“富煤贫油少气”的能源赋存结构及煤炭未来一段时间将长期占据能源消耗主导地位的特点,回顾了我国煤炭井工开采领域冻结立井井筒机械化掘进发展历程。钻爆法凿井作为我国立井井筒施工的主要工法,炸药的应用大幅提高了冻结井筒的掘进效率,配套的伞钻打孔、抓岩机装岩、大型井架及设备提升、大模板砌壁等大型机械化设备的应用,大幅提高了井筒成井速度;竖井钻机、反井钻机及竖井掘进机作为特殊地层条件下立井井筒特殊凿井方式,也有各自应用范围。面对我国西部富水弱胶结地层特点及智慧矿山发展趋势,采用冻结+钻爆法施工难以满足千米级弱胶结岩层立井井筒智能化无人化的建设需求,而采用冻结+竖井掘进机钻井是未来超深立井井筒技术发展方向之一。结合国外冻结+竖井掘进机凿井工程案例,针对我国西部富水弱胶结岩层立井井筒建设,提出了冻结+竖井掘进机凿井在冻结壁厚度和强度设计理论、双层钢筋混凝土井壁永久支护、低温环境下竖井掘进机掘进破岩形式以及分级上排渣方式等冻-掘-支-运协同作业方面提出了合理化建议;明确了井壁结构与弱胶结围岩相互作用机理,优化双层井壁结构方法,构建竖井掘进机掘-支-运同步作业模式等,提升井筒建设综合效率,提高信息化水平,推动立井井筒向机械化、绿色化和智能化发展。

异质性数字化投入对制造业绩效的影响机理——基于文本分析的实证方法

基于2016-2021年制造业上市企业平衡面板数据,以异质性数字化投入为切入点,运用文本分析方法和面板回归模型,研究通用型数字化投入和专用型数字化投入对企业绩效的影响及作用机制。研究发现:第一,通用型数字化投入与企业绩效之间存在非线性关系(先上升再下降),且投入临界值为0.3678;第二,专用型数字化投入与企业绩效之间关系不显著;第三,管理效率优化是企业数字化投入作用于企业绩效的中间机制,在通用型数字化投入影响企业绩效的过程中发挥非线性中介传导作用,而商业模式创新在目前尚未发挥有效作用。研究结论表明,经过通用型数字化投入的“红利期”,其对企业绩效的正向影响呈递减趋势。

论环境纠纷非诉解决机制的专门化与法典回应

环境纠纷的特殊性与环境责任的专门性要求环境纠纷非诉解决机制应在传统方式的基础上进行专门化构建。国外的环境纠纷非诉解决机制的专门化主要体现为专门的环境纠纷行政处理机制、专门法院附设ADR机制、专门的民间性环境ADR机制三种样态。我国的环境纠纷非诉解决机制专门化应朝着引入中立评估、重塑环境纠纷行政处理、激活环境仲裁、健全生态磋商、探索设立新型环境ADR机构等方向努力。同时,在生态环境法典编纂的背景下,环境纠纷非诉解决机制专门化也应在法典中得到回应,明确专门化的基本内容和形式。

《起重机械安全技术规程》对机械式停车设备设计的要求

我国是全球机械式停车设备生产和使用第一大国。特种设备安全技术规范是机械式停车设备设计、制造、安装、维修、检验检测、使用管理和安全监管的强制性要求。本文从提高机械式停车设备的本质安全角度,详细介绍了即将施行的特种设备安全技术规范TSG 51-2023《起重机械安全技术规程》中对机械式停车设备设计的具体规定,包括设计的基本要求、主要金属结构、主要工作机构、主要零部件、主要控制系统、安全保护装置等,分析了该规程与现行相关安全技术规范的主要区别,以期帮助生产、使用、检验检测单位正确理解和使用。

油气井井下切割技术发展现状及趋势

油气开发后期,退役井数量急剧增加,完井修井作业中套管磨损、卡钻等问题突出,退役经济耗费显著增加。为最大限度减少卡钻和退役经济耗费,有必要开展新型套管切割技术及装备的研发与应用。首先,总结了现阶段井下管柱切割技术的主要类型、工作原理和配套装备,包括机械切割、磨料射流切割、聚能切割、化学切割、电弧切割以及激光切割;对比机械切割、磨料射流切割以及特种切割方式的技术发展现状和趋势,分析上述切割方式的工程应用及优缺点;在此基础上,提出面向高效套管切割工程需求的主要切割技术及工具。结合目前切割技术及工具的发展现状,对未来井下管柱切割技术给出优化割刀性能、加强磨料射流切割的控制、研制新型切割工具及切割工具智能化等建议。

论档案开放审核容错机制的构建

本文旨在探讨档案开放审核容错机制的构建。首先介绍了档案开放审核的定义、目标以及当前遇到的问题。然后分析了档案开放审核容错机制与档案开放审核容错系统的区别,并解释了其独特的特点。其次,描述了档案开放审核现状及存在的问题,指出档案开放审核容错机制的缺位是档案开放审核不容忽视的短板。接着提出了构建档案开放审核容错机制应遵循的原则,详细描述了该机制的构建内容和过程。在此基础上,明确了档案开放审核容错机制的核心和基础要素。此外,提出建立“档案开放审核专班”的设想,深入探究了相关方的主体权责以及相互关系。接着探讨了对档案开放审核容错机制的评价评估方法以及完善与更新策略。最后,再次强调了构建有效的容错机制的重要性,以及建立“档案开放审核专班”的必要性,为提高档案开放审核的严谨性、准确性、规范性和学术性提供了有益的建议。

矿物加工工程专业基础课程“工程流体力学”教学方法的思考与实践

根据新工科专业基础课程特点,以培养一流工程技术人才为目标,基于OBE教育理念,工程流体力学教学团队通过课程体系建设、教学方案优化、教学模式改进以及案例教学融合,重构了课程内容,探索创新了“工程为主—问题导向—案例驱动—科研反哺—育人优先”的教学模式,开展以学生为中心的教学方法创新和持续改进策略,赋予课程以创新性和高阶性的新内涵,努力建设富有挑战度的一流本科课程。