Assessment of Operational Performance in a Power Generation/Selling Integrated Company Using a Dynamic Proportional Adjustment Coefficient

Currently,the operational performance assessment system in the power market primarily focuses on power generation and electricity retail companies,lacking a system tailored to the operational characteristics of power generation/selling integrated companies.Therefore,this article proposes an assessment index system for assessing the operational performance of a power generation/selling integrated company,encompassing three dimensions:basic capacity,development potential,and external environment.A dynamic proportional adjustment coefficient is designed,along with a subjective and objective weighting model for assessment indexes based on a combined weightingmethod.Subsequently,the operational performance of an integrated company is assessed using extension theory.The results in the case study demonstrate the feasibility and effectiveness of the proposed dynamic proportional adjustment coefficient.

Research on the Distribution of Incremental Benefits from the Entry of Collective Construction Land into the Market

In this paper,based on the process data of evaluating the benchmark land prices of collective construction land and agricultural land,the score of influencing factors is calculated,and a regression model between value-added benefits and influencing factors is established.According to the contribution of the government and collectives to value-added benefits,the distribution proportions of different purposes and levels are calculated.The research results show that there are significant differences in the distribution proportion of value-added income among different levels.The government distribution proportion decreases with the decrease of level,while the collective distribution proportion increases with the decrease of level.For each level of decrease in commercial service industry land and industrial and mining warehousing industry land,the government distribution proportion decreases by an average of 2.66%and 2.34%,while the collective distribution proportion increases by an average of 2.66%and 2.34%,respectively.The average distribution proportion of the government in the value-added income of commercial service industry land is 31.58%,which is much higher than the average income of 23.68%in the value-added income of industrial and mining warehousing industry land.

Advance of Study on Design Methods of Hydraulic System of Radio Remote Control of Construction Machinery

The working principle of radio remote controlling of construction machinery should be that signals of the radio wave from the transmitter obtained in the receiver were controlled and then changed into electronic analog or digital signals which can be used to drive different actuators and mechanisms of the vehicle.The vehicle could be acted by following the controlling instructions sent by the operator.The best operation mode of construction machinery is suitable not only to manual operating but also to remote controlling in the same vehicle.The design methods of the hydraulic system used for the radio remote controlling of construction machinery are discussed.The design methods of hydraulic circuits for the actuators controlled by solenoid on-off type valves,hydro-electronic multi-way proportional valves,closed loop proportional servo driver or three-way proportional reducing valves are discussed in detail (with real example).The design methods of the power shift transmission of electro-hydraulic controlling,the devices of braking and the directional streering are discussed in this paper.

A Method for the Squaring of a Circle

This paper presents a Method for the squaring of a circle (i.e., constructing a square having an area equal to that of a given circle). The construction, when applied to a given circle having an area of 12.7 cm2, it produced a square having an area of 12.7 cm2, using only an unmarked ruler and a compass. This result was a clear demonstration that not only is the construction valid for the squaring of a circle but also for achieving absolute results (independent of the number pi (π) and in a finite number of steps) when carried out with precision.

Research on vertical deformation during construction of Shanghai World Financial Center

Shanghai World Financial Center is one of the highest buildings in the world, of which cumulation of vertical deformation during construction is significant and worth investigating. A refined finite element model was developed to conduct full-process analysis of construction of super-high rise buildings like Shanghai World Financial Center, in which the discrete analysis method of time-varying structures and age-adjusted effective modulus method were both used. In the finite element analysis, the whole construction process was divided into a series of stages, each with a structural system that is a part of the whole structure and with different material parameters, geometrical parameters, loading and boundary conditions. The whole construction process of Shanghai World Financial Center in consideration of creep of concrete was simulated successfully by using the finite element model and the analytical method developed. With respect to different construction stage, the total vertical deformation, inter-floor compression deformation and the relative deformation between the outer frame and the core-wall were obtained through the analysis. The comparison between the results from the stage-wise full-process analysis of construction with and without considering the creep and the results from the conventional analysis of the whole building under the total load from all self-weight and construction applied to the structure "in one go" shows that the cumulative effect on the deformation from the construction process and the creep effect need to be considered in analyzing the deformation of Shanghai World Financial Center, and the super-high rise buildings suchlike. Finally, the simulation results correlate well with the monitoring results-a proof of the feasibility and the validity of this paper.

A Horizontality Adjusting Study of the Earth Drill′s Platform

A horizontality adjusting system of the earth drill's platform is designed todeal with the operation difficulty of the platform which appeared while the earth drill is used.The proportional-impulse control to eliminate the over-adjustment andelectricity-hydraulic-proportional control to drive the adjusting mechanism are adopted in thesystem. The control scheme and control algorithm are introduced in detail. The software flow chartis given.

Self Adjusting Feedforward Compensation Tracking Control for Proportional Valve Controlled Motor

Aim Aiming at the position tracking control for valve controlled motor electrohydraulic proportional servo systems mainly driving the static load torque, the tracking performance was studied in the presence of the variable gain and deadzone. Methods On the basis of conventional composite control with the deadzone compensation method, a comprehensive control approach with the deadzone and self adjusting feedforward compensation was proposed. Results Experimental results showed that the good tracking performance was achieved for the sinusoidal and constant velocity position tracking under a wide variations of load torque. Conclusion The position tracking accuracy for valve controlled motor electrohydraulic proportional servo systems has been solved by using the comprehensive control approach with the deadzone and self adjusting feedforward compensation.

One-Step-Installation of Offshore Wind Turbine on Large-Scale Bucket-Top-Bearing Bucket Foundation

In 2010,the first offshore wind turbine with integrated installation was established in Qidong sea area of Jiangsu Province,China,which led to the implementation phase of one-step-installation technique based on the design and construction of large-scale bucket-top-bearing (LSBTB) bucket foundation.The critical technique of LSBTB bucket foundation included self-floating towing,penetration with adjustment of horizontal levelness,removability and one-step-installation.The process of one-step-installation included the prefabrication of LSBTB bucket foundation in onshore construction base,installation and debugging of wind power,overall water transportation of foundation and wind power system,and installation of foundation and offshore wind turbine on the appointed sea area.The cost of one-step-installation technique was about 5 000 Yuan/kW,which was 30%-50% lower than that of the existing technique.The prefabrication of LSBTB bucket foundation took about two months.During the one-step-installation process,the installation and debugging of wind power and overall water transportation need about one to two days in sea area within 35 m depth.After the proposed technique is industrialized,the cost will be further reduced,and the installation capacity is expected to be up to 500 wind turbines per year.

An improved Gmapping algorithm based map construction method for indoor mobile robot

With the rapid development in the service,medical,logistics and other industries,and the increasing demand for unmanned mobile devices,mobile robots with the ability of independent mapping,localization and navigation capabilities have become one of the research hotspots.An accurate map construction is a prerequisite for a mobile robot to achieve autonomous localization and navigation.However,the problems of blurring and missing the borders of obstacles and map boundaries are often faced in the Gmapping algorithm when constructing maps in complex indoor environments.In this pursuit,the present work proposes the development of an improved Gmapping algorithm based on the sparse pose adjustment(SPA)optimizations.The improved Gmapping algorithm is then applied to construct the map of a mobile robot based on single-line Lidar.Experiments show that the improved algorithm could build a more accurate and complete map,reduce the number of particles required for Gmapping,and lower the hardware requirements of the platform,thereby saving and minimizing the computing resources.

A METHOD OF ADJUSTING BAR-LENGTH OF STATICALLY INDETERMINATE TRUSS FOR INCREASING ITS LOAD CAPACITY

Based on the character of the internal force distribution of the statically indeterminate truss, the elements stresses were changed by adjusting the length of bars to increase load capacity of structure. The efficiency of the method is illustrated by several examples.

China's Exhibition Economy Maintained Rapid Growth in Spite of Global Recession

The year of 2015 has witnessed recovery and adjustment of world economy after the international financial crisis.China’s exhibition industry is often considered as an important platform for constructing modern market system and open economic system.Recently,Annual Report on China’s Exhibition Industry(2015)was published.China Council for the Promotion of International Trade(CCPIT)started to edit and publish China’s Fairs and Exhibitions in 1995

社会保障学科发展的三个转向

在中国式社会主义现代化进程中,社会保障的实践和理论研究随之发展。当前,社会保障学科发展将呈现以下三个重要转向。一是关注并参与人口问题的研究,厘清人口学的基本概念,把握人口学的基础理论。各项公共政策与管理都以人口政策与管理为基础,社会保障作为福利政策与管理,也不例外。二是任何社会形态都有其“普照的光”,当今我国的“普照的光”已由“小康”转变成“共同富裕”。在其照耀下,社会保障体系建设的重点将由“扩面”“保底”“助弱”转移到“调结构”上来。三是社会保障的研究范式也相应地会由经济学、社会学为主导转向管理学为主导。

改进迭代贪婪算法求解可重入流水车间调度问题

可重入混合流水车间是在混合流水车间的基础上增加了可重入特性,具有更高的调度复杂性。为了求解可重入混合流水车间调度问题,首先建立了调度优化模型,优化目标为最小化最大完工时间,然后提出一种带精英调整的学习型迭代贪婪算法(LIG-EA)。LIG-EA算法采用基于工件的编码方式,对重组后的染色体进行解码。种群分为精英个体和普通个体两部分,对精英个体进行精英破坏重建和基于关键工件的染色体调整,对普通个体进行学习机制的构建和普通个体的破坏重建。为提高初始种群质量,采用NEH启发式算法进行种群初始化,并针对可重入混合流水车间的重入特性,在重建操作中增加了插入有效性判断,提高了算法的运行速度。通过大量实验表明LIG-EA算法能够有效求解可重入混合流水车间调度问题。

高精度管道漏风量测试仪的设计及实验研究

现有的国产漏风量测试仪普遍存在测量精度低、自动化水平低的问题,为此,基于漏风量测试仪的原理,开展了漏风量测试仪的结构设计、系统设计及整机实验研究。首先,对漏风量的测量过程、喷嘴流量测量原理进行了研究,推导了喷嘴流量测量公式,并根据相关标准设计了角接取压方式的喷嘴结构,基于仪器操作便捷性要求,对整机结构进行了设计;其次,采用空气密度补偿公式完成了高精度流量自适应测量,设计了基于自锁式电磁阀的换向调零电路,采用换向调零法对压差传感器零点漂移进行了补偿,使用小波阈值去噪算法消除了信号噪声,提高了流量的测量精度;采用抗积分饱和比例积分微分(PID)算法对流量进行了闭环控制;最后,研制了管道漏风量测试仪样机,开展了压差与流量测量精度与重复性实验。实验及研究结果表明:该高精度漏风量测试仪工作状态稳定,压差测量精度为±0.4%,流量测量精度为±2%;该漏风量测试仪的测量精度优于国内同类仪器,符合国家标准要求,具有良好的市场前景。

基于机器学习的盾构姿态预测模型与控制方法研究

为避免盾构轴线偏离引发衬砌管片错台、开裂等质量与安全问题,提出一种基于机器学习算法的盾构姿态智能预测模型与控制方法。以盾构掘进施工的实测数据为驱动,通过贝叶斯优化(BO)与支持向量回归(SVR)构建盾构姿态预测模型,挖掘施工参数-地层信息-盾构姿态三者间的非线性关系。结合模拟退火算法(SA)形成可控施工参数动态调整的盾构姿态控制方法,并将其应用于福州滨海快线南—三区间隧道的工程实践。主要结论如下:1)经数据预处理、特征筛选及BO超参数优化,基于SVR的盾构姿态预测模型具备优异的预测性能和泛化能力;2)结合SA算法进行可控施工参数调整时,需设置合理的优化规则,以确保所推荐的可控施工参数具备可操作性;3)将姿态控制方法应用于南—三区间后续掘进施工以辅助纠偏,盾尾垂直偏差在10环掘进过程中由45 mm减至18 mm,实现了连续稳定纠偏。

新时代特色商科学科建设与优化调整研究

新质生产力的发展要求新时代特色商科学科建设满足人才培养的新需求,需要对新时代特色商科进行优化调整。商科高校需要更加注重培养学生分析、解决问题的能力;需注重培养商科知识与相关交叉学科知识迁移能力;需注重培养个人职业道德素养和商业伦理素养。需要将通识教育、专业教育和学科教育三者交叉融合起来,构建新知识体系;在经管特色专业优势基础上探索理工相结合的复合型人才培养之路;新时代特色商科优化调整需要许多高校以及政府部门共同参与进来,使整个系统运转起来。

基于用途与级别的集体建设用地入市增值收益分配研究

将影响集体建设用地入市增值收益的因素分为外部因素和内在因素,其中外部影响因素分为政府影响因素和集体影响因素,政府影响因素反映政府对增值收益的贡献,集体影响因素和内在因素共同反映集体对增值收益的贡献。以集体建设用地、农用地基准地价评估的过程数据为基础,计算影响因素分值,建立增值收益与影响因素的回归模型,依据政府、集体对增值收益的贡献,测算分用途、分级别的分配比例。结果表明,不同级别增值收益分配比例有较大差异,政府分配比例随级别的降低而减少,集体分配比例则随级别的降低而增加,每降低一个级别商业服务业用地、工矿仓储业用地,政府分配比例平均分别减少2.66%、2.34%,集体分配比例则平均分别增加2.66%、2.34%;政府在商业服务业用地增值收益中的平均分配比例为31.58%,远高于在工矿仓储业用地增值收益中23.68%的平均分配比例。

比例电磁阀内置式CDC减振器设计与验证

设计了一种比例电磁阀内置式连续阻尼可调(Continuously Damping Control,CDC)减振器,分析了其主要结构组成及工作原理,并基于流体力学建立了参数化仿真模型。通过仿真和试验的方法获得了该CDC减振器的示功特性曲线和速度特性曲线,并从2组特性曲线的形态变化来分析了其阻尼特性的可调范围和调节特点。结果表明:仿真和试验结果相对误差小于10%,仿真模型准确有效;该CDC减振器的阻尼力随着激励电流的增大而减小,这种减小趋势的速率随着激励电流的增加先增大后减小;速度特性曲线的斜率在“拐点速度”之前逐渐变大,在“拐点速度”之后基本不变,且随着激励电流的增大而逐渐减小;该CDC减振器在复原行程的阻尼力可调范围为1544~4914 N,压缩行程的阻尼力可调范围为-1415~-1937.7 N。

西南山区高速铁路非正常情况下列车运行调整探讨

西南山区与平原地区的地域特点存在显著差异,高速铁路运输组织在装备上、组织上、要求上明显不同。通过分析西南山区高速铁路非正常情况下列车运行调整类型,按轻微事故及严重干扰事故类型进行模型构建。以成渝高速铁路列车运行调整为例,计算验证结果表明,该模型求解速度快,具有较高的求解质量,对西南山区高速铁路非正常情况下干扰列车运行的不同场景均有一定的适应性,为提高山区高速铁路运行的安全系数提供支撑。

重庆白居寺长江大桥施工控制关键技术

重庆白居寺长江大桥主桥为主跨660 m的公轨两用双塔双索面钢桁梁斜拉桥。桥塔为空间曲线水滴形混凝土结构,采用爬模施工;钢桁梁为带边纵梁的倒梯形截面,利用桥面吊机进行对称悬臂施工。为确保成桥后的各项力学和线形指标满足设计要求,采用MIDAS Civil软件建立主桥施工阶段有限元模型,对塔顶偏位和应力、钢桁梁线形及斜拉索张拉进行施工监控。通过控制塔顶偏位以及关键断面应力,确保了钢桁梁施工中桥塔的安全;通过控制主桁和边纵梁的制造和安装线形,保证了钢桁梁成桥线形的控制精度;通过边、中跨1~5号索同步对称初张、6~20号索分级不对称初张及局部二次调索,提高了斜拉索的施工效率以及索力控制精度。施工监控结果表明:塔顶偏位最大偏差27 mm,钢桁梁线形最大偏差52 mm,斜拉索索力偏差在±5.6%内,均满足设计要求。