Study on the Impact of Collective Commercial Construction Land Entering the Market on Rural Residents’Income:Taking Deqing County,Zhejiang Province as an Example

The entry of collective construction land for business purposes is an important measure for deepening the reform of the rural land system,promoting the flow of urban and rural factors,and realizing rural revitalization.Since the production of the first batch of pilot projects in 2015,33 county-level cities have participated in the pilot policy by 2023.Deqing County,Zhejiang Province,as the first area to participate in the pilot project,aims to achieve more fruitful results.This paper first examines how promoting farmers’income through the market entry of agricultural land can be achieved,then uses the synthetic control method to quantitatively study the impact of collective operational construction land on farmers’income using panel data from 2011 to 2019,and finally proposes relevant suggestions from the perspective of system reform.

Controlling Methods and Causes of Wall Cracks of Civil and Industrial Construction Projects

Since the reform and opening up,Chinese economy has developed rapidly.Industrial and civil construction projects have made significant progress.That said,it is of great significance to further strengthen the construction management of industrial and civil construction projects for the longterm development of construction industry in China.In terms of reality,one of the common problems in the current industrial and civil construction is wall cracks,which will have an important impact on the appearance of the building and the overall construction quality.Therefore,it is necessary to analyze the reasons and put forward corresponding measures on it.That is how we can continuously improve the construction quality in civil and industrial construction projects,thereby achieving the enhancement of building safety and stability.

The Theory and Methods Research on Ecological Quality Control of Enterprises

So far, most theories of economics and management are under the same premisethat the natural resources are never exhausted and regenerated repeatedly. The magic of technologybrought by industrial revolution endowed human with power that they can do anything they want. Italso turns natural resources into industrial energy and enhances the development of human societyand civilization. Human uses direct comparison of input and output and the satisfaction degree ofdemands to measure the production activities, the economic benefit and management performance,regardless of the change of ecology that serves as the natural resources. However, since theecological environment has been changing worse recently and natural disaster happened frequentlyhuman's dream of conquering the nature has been broken. The nature implements reprisal against humanagain and again, and human is faced with the development limit because of the environmentalrestriction.

Optimization of anchorage support parameters for soft rock tunnel based on displacement control theory

In the construction of a soft rock tunnel,it is critical to accurately estimate the pre-stressed anchor support parameters for surrounding rock reinforcement;otherwise,engineering disasters may occur.This paper presents a support parameter selection method that aims to allow deformation as a control objective,which was applied to the tunnel located in Muzailing Highway,Min County,Dingxi City,Gansu Province,China.Through theoretical analysis,we have identified five factors that influence pre-stressing anchorages.The selection of mechanical parameters for the rock mass was carried out using an inverse analysis method.Compared with the measured data,the maximum displacement error of the numerical simulation results was only 0.07 m.The length of anchor cable,circumferential spacing of anchor cable,longitudinal spacing,and pre-stress index are adopted as the input parameters for the support vector machine neural network model based on particle swarm optimization(PSO-LSSVM).Besides,the vault subsidence and the maximum deformation of surrounding rock are considered as output values(performance indices).The goodness of fit between the predicted values and the simulated values exceeds 0.9.Finally,all support parameters within the acceptable deformation range are calculated.The optimal support variables are derived by considering the construction cost and duration.The field application results show that it is feasible to construct the sample database utilizing the numerical simulation approach by taking the displacement as the control target and using the neural network to specify the appropriate support parameters.

Construction and control technology of the main bridge superstructure of Sutong Bridge

The Sutong Yangtze River Bridge(short as Sutong Bridge)is now the largest span cable-stayed bridge in the world.The construction of the superstructure of the middle bridge covered several stages including erection of the big block girders for the side span,assistant span and tower area,erection of standard girders and closure of the middle span.The big block girders were hoisted by a floating crane,and the standard girders were hoisted by a double crane system on the deck.The pushing assistant method was adopted for the middle span closure construction.Furthermore,key technologies and innovative methods used in the processes of girder erection and cable assemblage in all stages were expatiated systematically.An all-stage self-adaptive geometry control method was used in the construction process.By accurately controlling the unstressed dimensions and shape of all structural components in each step,and realization that the control system and the controlled system adapt to each other,the goal was to make control of the final line shape and inner force of the bridge structure achievable.Two solutions,including GPS based and total station based dynamic geometry monitoring systems,were used to resolve the measure problem under the wide-range of wind-induced vibrations in the long cantilever state.Finally,research on the wind-induced vibration of the superstructure during the construction period was executed.Buffeting response analysis to the longest single and double cantilever states were carried out.The analysis and evaluation of wind resistance safety of the main girders under the longest single cantilever state was made,and corresponding wind resistance measures were suggested.The as-built geometric error and cable force error were controlled in a required design range,and this whole technological achievement can be a benchmark for construction of other large span cable-stayed bridges in the future.

Performance of the suspension method in large cross-section shallow-buried tunnels

Large cross-section tunnel construction induces ground surface settlements, potentially endangering both subterranean projects and nearby above-ground structures. A novel tunnel construction method, known as the suspension method,is introduced in this paper to mitigate surface settlement. The suspension method employs vertical tie rods to establish a structural connection between the initial tunnel support system and the surface steel beam, thereby exerting effective control settlements. To analyze the performance of the proposed method, systematic numerical simulations were conducted based on the practical engineering of Harbin Subway Line 3. The surface settlement and vault settlement characteristics during construction are investigated. The results show a gradual increment in both surface and vault settlement throughout the construction process, culminating in a stabilized state upon the completion of construction.In addition, compared to the double-side drift method and the Cross Diaphragm Method(CRD) method, the suspension method can obviously reduce the surface settlement and vault settlement. Moreover, the surface settlements and the axial force of tie rods were continuously monitored during the construction process at the trial tunnel block.These specific monitoring measurements are illustrated in comparison to numerical analysis results. The monitored results show great agreement with the numerical predictions, confirming the success of the project. This research can serve as a valuable practical reference for similar projects, offering insights and guidance for addressing ground surface settlements and enhancing construction safety in the domain of large cross-section tunneling.

Geometry model construction in infrared image theory simulation of buildings

Geometric model construction is the basis of infrared image theory simulation. Taking the construction of the geometric model of one building in Harbin as an example, this paper analyzes the theoretical groundings of simplification and principles of geometric model construction of buildings. It then discusses some particular treatment methods in calculating the radiation transfer coefficient in geometric model construction using the Monte Carlo Method.

Research on adaptive anti-rollover control of kiloton bridge transporting and laying vehicles

The SPMT construction method is a new rapid construction technology of large urban overpass with unblocked traffic,and unstability of SPMT construction method equipment cannot be accurately described due to the concrete beam size,irregular shape and complex transport conditions,which is called kiloton bridge transporting and laying vehicle.The anti-rollover performance of SPMT suspension system is studied,and vehicle side slip angle and load transfer rate(LTR) are regarded as the evaluation indexes.An active suspension adaptive anti-rollover control model of SPMT,in which roll stability affected by the structural parameters and control parameters,is built based on fuzzy PID,and the effectiveness of the control method is verified through real vehicle test.

Control and Synchronization with Known and Unknown Parameters

In this paper, we consider the chaos control for 4D hyperchaotic system by two cases, known & unknown parameters based on Lyapunov stability theory via nonlinear control. We find that there are two cofactors that have an effect on determining any case to achieve the control, the two cofactors are proposed in the control and the matrix that produce from the time derivative of Lyapunov function. In adding, we find some weakness cases in Lyapunov stability theory. For this reason, we design with only one controller and perform a simple change in this control in order to recognize the difference between these cases although all of the controllers are almost similar.

Overview of multirate sampled-data control system

The basic analysis and synthesis approaches for multirate sampled-data control system are reviewed. After giving the definition and some properties of multirate system are given, its origination, development and design methods are discussed in detail. Finally, some remarks, expectations and conclusions on the present research status and the research directions are given.

Fast Solvers of Fredholm Optimal Control Problems

The formulation of optimal control problems governed by Fredholm integral equations of second kind and an efficient computational framework for solving these control problems is presented. Existence and uniqueness of optimal solutions is proved.A collective Gauss-Seidel scheme and a multigrid scheme are discussed. Optimal computational performance of these iterative schemes is proved by local Fourier analysis and demonstrated by results of numerical experiments.

基于组合赋权-VIKOR法的山区施工便道方案优选模型

为对山岭地区施工便道方案进行客观、全面、精准评价,结合行业设计规范和相关研究成果,构建山区施工便道方案指标评价体系,提出一种山区施工便道方案优选模型。该模型采用三标度层次分析法和熵权法分别计算评价指标的主、客观权重,基于博弈论思想对主、客观权重进行赋权确定综合权重,并运用VIKOR法(多准则妥协解排序法)对山区施工便道方案进行优选。以某高速公路山区施工便道方案比选为工程实例,针对4种施工便道方案进行综合比选,并将本文模型与加权TOPSIS法(优劣解距离法)、灰色加权关联分析法进行对比分析。研究结果表明:3种计算模型得出的最优方案一致,组合赋权的方法克服了单一赋权的缺陷,使指标评价更客观。相比于加权TOPSIS法和灰色加权关联分析法,本文模型能抵御外部因素的干扰,明显地辨别方案之间的差距,得到准确清晰的方案排序,且当评价方案众多时,本文模型能够提供更多方案选择,得到最优化方案。

未确知测度理论在盾构下穿既有隧道安全风险评价中的应用

盾构下穿既有隧道工程施工通常存在较大风险,为了对风险等级做出准确有效的评价,提出了基于未确知测度理论的盾构下穿既有隧道安全风险评价模型。首先,通过对相关规范和现有文献的研究,并结合盾构下穿隧道施工的特点,构建了盾构下穿既有隧道安全风险评价指标体系,包括盾构掘进参数、新建隧道条件、既有隧道条件、地质条件和施工管理条件5个一级指标,以及掘进速度、掘进推力、注浆压力等19个二级指标;其次,将综合安全风险划分为5个等级,并明确了各指标的等级划分标准;然后基于熵权-未确知测度理论构建盾构下穿既有隧道安全风险评价模型,采用熵权法确定指标权重,根据未确知测度理论构建各指标的单指标未确知测度函数,将各指标数据值代入单指标未确知测度函数中得到单指标测度评价矩阵,结合指标权重和单指标测度评价矩阵计算得到多指标测度评价向量,依照置信度准则确定安全风险等级;最后,将提出的模型应用于实际盾构下穿既有隧道工程中,对其进行安全风险等级评价。结果表明,模型评价结果与实际风险等级一致,并通过与模糊层析分析法对比验证了所提模型应用于工程实践的有效性,研究结果可为实际施工安全管理提供决策支持。

基于系统理论的中国-东盟网络安全合作系统构建研究

[研究目的]针对中国-东盟网络安全合作在观念、制度、人才、技术等方面存在的问题,构建合作系统框架,提出合作路径及解决方案,旨在提高中国-东盟网络安全合作的水平。[研究方法]通过文献分析,结合系统理论,从系统的要素、结构(功能)、环境等维度进行研究。[研究结论]中国与东盟在构建网络安全合作系统时可以实施以下路径:在系统要素方面,以网络空间命运共同体理念展开合作、以建立统一的网络安全制度规范框架进行合作、以构建网络安全人才培养培训教育体系保障合作、以创新网络安全技术加强合作;在系统结构(功能)方面,增强系统不同要素间的协同联动、准确把握系统要素最优与结构(功能)最优关系;在系统环境方面,在梳理可供利用的外部环境的基础上,重点利用经济、政治、文化环境优化系统。

The Ultimate Anti-Seismic Design Method

The design mechanisms and methods of the invention are intended to minimize problems related to the safety of structures in the event of natural phenomena such as earthquakes, tornadoes, and strong winds. It is achieved by controlling the deformations of the structure. Damage and deformation are closely related concepts since the control of deformations also controls the damage. The design method of applying artificial compression to the ends of all longitudinal reinforced concrete walls and, at the same time, connecting the ends of the walls to the ground using ground anchors placed at the depths of the boreholes, transfers the inertial stresses of the structure in the ground, which reacts as an external force in the structure’s response to seismic displacements. The wall with the artificial compression acquires dynamic, larger active cross-section and high axial and torsional stiffness, preventing all failures caused by inelastic deformation. By connecting the ends of all walls to the ground, we control the eigenfrequency of the structure and the ground during each seismic loading cycle, preventing inelastic displacements. At the same time, we ensure the strong bearing capacity of the foundation soil and the structure. By designing the walls correctly and placing them in proper locations, we prevent the torsional flexural buckling that occurs in asymmetrical floor plans, and metal and tall structures. Compression of the wall sections at the ends and their anchoring to the ground mitigates the transfer of deformations to the connection nodes, strengthens the wall section in terms of base shear force and shear stress of the sections, and increases the strength of the cross-sections to the tensile at the ends of the walls by introducing counteractive forces. The use of tendons within the ducts prevents longitudinal shear in the overlay concrete, while anchoring the walls to the foundation not only dissipates inertial forces to the ground but also prevents rotation of the walls, thus maintaining the structural integrity of the beams. The prestressing at the bilateral ends of the walls restores the structure to its original position even inelastic displacements by closing the opening of the developing cracks.

基于组合赋权-云模型的智能建造应用成熟度的评价

为解决传统施工方式存在的问题,建筑施工企业向智能建造方式逐渐转型已是大势所趋。针对新时代、新基建对智能建造施工的要求并结合能力成熟度理论,提出一种基于组合赋权-云模型的智能建造应用成熟度评价模型。首先,从施工、智能、其他3个维度,构建包含勘测、设计规划、施工现场管理、资源要素、智能建造技术、数据驱动、企业顶层设计7个类别的智能建造应用成熟度评价体系。其次,采用G1法与熵权法确定各指标的主、客观权重,运用博弈论进行权重组合。最后,通过云模型展示施工企业智能建造应用成熟度等级,并依据评价结果进行展望。研究结果表明:施工企业智能建造应用成熟度评价等级为“集成共享级”,评价结果与该企业实际情况吻合,验证了本文方法的适用性与科学性,为施工企业智能建造应用的发展提供科学依据。

工程造价超预算的原因分析和控制方法研究

在工程项目实施过程中,工程造价控制成为项目管理中的关键环节。本文从工程造价预算控制有益于项目顺利结算、有利于项目合理投入、有助于减少变更数量三个方面阐述了其意义。提出了造成超预算是因为施工组织设计脱离实际、工程施工进度失去控制、项目成本管理缺乏力度三个主要原因,提出了相应的控制方法,应严审施工组织设计以减少施工变更、严控工程施工进度以降低延期消耗、强化预算控制意识以提升投入效能。

合规情报的基本问题研究

使用透过“名”与“实”分离表象的真实情报行为识别、参加合规管理专题会议调研、案例研究、文献资料研究、专家咨询访谈等方法,围绕合规管理的情报属性、合规管理情报行为与现有情报学分支领域的关系、合规情报的概念与学科发展前景、当前合规情报研究与服务的优先推进领域等问题进行研究。本文认为合规管理属于典型的“情报(intelligence)”行为,合规情报是不同于已有情报学分支领域的新的分支领域和学科方向;提出了合规情报的概念并凝练其含义要点,指出培育合规情报学科方向既有可行性也有必要性,具有重要意义和良好发展前景;指出当前合规情报研究与服务的四个优先推进领域:①合规情报基础理论方法;②合规情报专业人才培养;③合规情报技术工具开发应用;④合规情报的宣传推介。

自动控制理论课程的思政建设探索

自动控制理论是本科院校人工智能、电气工程及其自动化、电子信息等专业重要的基础性课程。在“大思政课”建设的时代背景下,结合自动控制理论课程思政目标,将创新教学方法,将社会责任感、爱国主义精神、民族自豪感、工匠精神等思政元素融入课程教学中,可进一步引导学生深化、内化社会主义核心价值观和哲学观,从而完成立德树人的根本任务,保证课程教学质量。

地铁建设期碳排放核算研究进展

全球变暖是人们高度关注的生态环境问题之一,碳排放成为研究热点。交通运输行业会产生大量能耗,地铁作为一种安全环保的交通方式正高速建设,建筑行业又具有较大减排空间,故对地铁建设期碳排放进行核算有助于预测碳排放趋势并为碳减排提供研究基础。本研究总结了地铁建设期碳排放核算在评估方法选择、系统边界划分、清单分析等方面的研究进展,学者们多基于全生命周期理论,使用排放因子法,将碳排放来源划分为建材生产、材料运输和现场施工3个阶段开展碳排放研究。本研究就现有清单分析内容进行了对比分析,发现建材生产阶段碳排放占比最大,且钢筋、混凝土、水泥是主要的高碳排建材,依此提出了地铁建设碳排放核算的基本研究方法及减排思路。