A Scheme of Dynamic Voltage Restorer to Improve Power Quality in Large Scale Industrial Enterprises

Loads in large scale industrial enterprises are always various and complex, causing insecure power quality. Meanwhile, some sensitive loads or precise instruments demand for high power quality. When voltage flicker or harmonics occurs, dynamic voltage restorer (DVR) can be used to stabilize the load-side voltage, which is a good manner of improving power quality. The paper explains the load demand in large scale industrial enterprises, analyzes several common voltage compensation scheme of DVR, and comes up with another voltage compensation scheme of DVR applied for double power supply with double load. A Simulink model according to the new scheme is also built in MATLAB/Simulink to test its performance. Simulation results show that the proposed scheme can guarantee the load-side voltage stability, which is an effective scheme for managing power quality.

Decentralized Stabilization of Large-scale Uncertain Systems with State-Delays——LMIs Approach

This paper deals with the problem of decentralized robustcontrol for a class of interconnected uncertain systemswith state delays.The parameter uncertainties are un-known but norm-bounded.A new sufficient condition isobtained for each subsystem and overall system to be sta-bilizable via linear memoryless state feedback robust de-centralized controllers.The results depend on the size of the delays and are given in terms of linear matrix ine-qualities,so they are less conservative than those of delay-independent.Moreover,matching condition is not a necessary condition.Finally,an example is presented to illustrative the effectiveness of the proposed method.

Utilization Survey of Livestock Manure Resources in Large-scale Farms of Yangzhou

Based on surveying the conditions of large -scale farms and commercial manure in the each county of Yangzhou city, the situations and problems for utilization of livestock manure resources were grasped. After an analysis of the potential value of livestock manure, the suggestion and strategy for utilization of livestock manure resources were proposed based on the actual conditions in Yangzhou city.

Formation conditions and exploration direction of large natural gas reservoirs in the oil-prone Bohai Bay Basin, East China

The Bohai Bay Basin is a typical oil-prone basin, in which natural gas geological reserves have a small proportion. In this basin, the gas source rock is largely medium-deep lake mudstone with oil-prone type Ⅱ2-Ⅱ1 kerogens, and natural gas preservation conditions are poor due to active late tectonic movements. The formation conditions of large natural gas fields in the Bohai Bay Basin have been elusive. Based on the exploration results of Bohai Bay Basin and comparison with large gas fields in China and abroad, the formation conditions of conventional large-scale natural gas reservoirs in the Bohai Bay Basin were examined from accumulation dynamics, structure and sedimentation. The results show that the formation conditions of conventional large natural gas reservoirs in Bohai Bay Basin mainly include one core element and two key elements. The core factor is the strong sealing of Paleogene "quilt-like" overpressure mudstone. The two key factors include the rapid maturation and high-intensity gas generation of source rock in the late stage and large scale reservoir. On this basis, large-scale nature gas accumulation models in the Bohai Bay Basin have been worked out, including regional overpressure mudstone enriching model, local overpressure mudstone depleting model, sand-rich sedimentary subsag depleting model and late strongly-developed fault depleting model. It is found that Bozhong sag, northern Liaozhong sag and Banqiao sag have favorable conditions for the formation of large-scale natural gas reservoirs, and are worth exploring. The study results have important guidance for exploration of large scale natural gas reservoirs in the Bohai Bay Basin.

Strategic Guidance Effect of Large-Scale Construction Enterprise Growth to Programme Contracting

In the case of single project management standing the major place, the management on the organizational level and project level is separated from each other in large-scale construction enterprises, and it is not long before program management theories applied to construction industry. Under the new situation of construction project clustering, how to choose projects has been the strategic decision for construction enterprises. Therefore,with the theory of program management and strategic management, this paper analyzes the relationship between the strategic growth of large-scale construction enterprises and program contracting, and attempts to provide meaningful ideas for enterprises to choose program from the strategic level.

大型建筑企业运作F-EPC项目的战略构思

本文分析了我国大型建筑企业开展带融资工程总承包的契机和驱动因素;阐述了运作F-EPC项目能力的构成要素及相互作用关系,培育企业运作F-EPC项目的能力应从工程项目管理、融资、人力资源管理等方面着手;提出开展带融资工程总承包的战略愿景、指导思想、准备与保障措施,战略实施的步骤以及基于能力提升的战略实施举措;以中国中铁股份公司相关实践为例进行实证研究,具体阐述了运作F-EPC项目的合同关键条款及组织管理理念,以期为相关实践提供参考及借鉴。

新型举国体制下复杂重大工程创新研究--基于创新生态理论的视角

新型举国体制以现代化重大工程为战略抓手,是重大工程科技创新的重要法宝。重大工程具有参与主体多元、多学科交叉融合、产业链长、建设周期长、技术复杂度高、知识关联性强、安全和质量标准高等特性,具备生态系统的典型特征,即复杂性、交融性和动态演化,基于创新生态理论视角研究复杂重大工程创新对重大工程的实施具有重要理论意义和现实价值。对复杂重大工程创新生态系统的内涵及构成进行解析,侧重探讨创新主体之间的依赖和演变关系,突出大型央企核心引领者和平台建设者的角色定位,强调以"共赢"理念为核心,制定发展战略和提升创新能力策略,以提升大型央企的资源整合和协同推进等能力。在新型举国体制下,探索提出大型央企需顺应新兴技术发展方向,协同生态系统中的配套主体共同创新实现生态系统整体跃迁,优化重大工程平台,推动复杂重大工程高质量发展。

大型施工总承包企业区域公司城市更新技术投标管理研究

近年来,国内经济市场的波动令大型施工总承包企业面临着前所未有的挑战与压力,而属地化区域公司由于扎根不深、资源有限、品牌影响力不足,难以承接新的项目。随着中央重点支持城市基础设施更新改造,历史建筑品质提升、危旧房、老旧小区改造逐渐成为城市更新改造的重点工程。因此,结合城市更新投标项目的管理实践,分析城市更新业务特征,通过“六位一体”经营技术、建立外部资源并提升技术人员资质、积极应对项目带来的挑战等有效管理手段,打造大型施工总承包区域公司的品牌效应,促进企业城市更新项目业务的多元化发展。

AN ADAPTIVE CONTROL STRATEGY FOR PROPER MESH DISTRI-BUTION IN LARGE EDDY SIMULATION

The Filtering Grid Scale （FGS） of sub-grid scale models does not match with the theoretical Proper FGS （PFGS） because of the improper mesh. Therefore, proper Large Eddy Simulation （LES） Mesh is very decisive for better results and more economical cost. In this work, the purpose is to provide an adaptive control strategy for proper LES mesh with turbulence theory and CFD methods. A new expression of PFGS is proposed on the basis of -5/3 law of inertial sub-range and the proper mesh of LES can be built directly from the adjustment of RANS mesh. A benchmark of the backward facing step flow at Re = 5147 is provided for application and verification. There are three kinds of mesh sizes, including the RANS mesh, LAM （LES of adaptive-control mesh）, LFM （LES of fine mesh）, employed here. The grid number of LAM is smaller than those of LFM evidently, and the results of LAM are in a good agreement with those of DNS and experiments. It is revealed that the results of LAM are very close to those of LFM. The conclusions provide positive evidences for the novel strategy.

数据资产应用关键技术在大型综合施工企业管理活动中的实践研究

随着工程建造领域信息化、机械化快速发展和智能建造技术逐步推进,当前大型综合施工企业在工程管理和生产经营中会产生大量数据资源,为响应国务院印发的《“十四五”数字经济发展规划》,以数据资源为关键要素,以现代信息网络为主要载体,以全要素数字化转型为重要推动力,从数据角度出发,以数据资源管理为基础,研究了工程招标过程中单价指标、中标金额、计划工期之间的差异性和关联性分析,给出了分析方法,搭建成套数据资产管理管控体系,并开展了数据资产转化及数据资产管理等方面的探索。可为传统建筑业向数字经济中数据深化应用、规范发展、普惠共享新阶段的快速转化提供技术实现路径和参考。

落实全面效益观,推进大型建筑企业高质量发展

当行业规模增长放缓,大型建筑企业如何进一步提高效益,是企业实现高质量发展必须解答的问题。上海建工集团基于企业发展历程的3个维度,制定了5个方面的具体措施,指明了落实全面效益观的路径。

大型建筑企业社会责任对企业竞争力的影响研究

以大型建筑企业为研究对象,从经济、社会和环境维度3个视角阐述企业社会责任划分,同时将衡量大型建筑业企业竞争力指标归纳为市场运营能力、技术创新能力、项目管理能力、资源管理能力和财务运作能力等5个方面,并通过构建结构方程模型探究履行社会责任对企业竞争力提升的影响机理.研究结果表明:大型建筑企业社会责任的3个维度对竞争力存在显著正向影响;影响社会责任履行的关键要素为按期付款、纳税及时且足额、争创精品工程以及环境保护;企业提升竞争力的关键要素为信息技术掌握情况、拥有和转化专利的情况、财务及融资状况、资本增值能力等.

小微工业企业和规模化畜禽养殖业用水权确权方法的思考与建议

为深入贯彻落实习近平总书记“努力建设黄河流域生态保护与高质量发展先行区”的指示,宁夏积极推进用水权改革工作,针对小微工业企业和规模化畜禽养殖业用水权确权,通过现场调研等方式,系统梳理其用水权确权存在的主要问题并给出建议,以期在全国全面推开用水权改革之际提供有益借鉴。

“433安全工作法”在基层车间班组的应用实践

围绕大型装备制造企业安全管理的特点,研究分析了生产安全事故发生的客观规律,针对当前安全管理过程中存在的不足,构建并实施了“433安全工作法”。通过明确各层级安全职责和量化履职标准,全面开展风险辨识、教育培训、应急演练和隐患排查,夯实基层一线安全管控基础,提升员工安全意识和安全技能,并以表单等形式固化履职和管理效果,为企业提升基层安全管理水平提供借鉴。

微信企业号在高校仪器共享平台管理中的实践与探索

微信企业号是针对企业进行管理的平台,它可以在移动互联网上为企业提供对内部员工的管理、沟通与服务。在仪器共享平台管理中使用微信企业号,可以在移动端实现共享仪器的查询、仪器预约、仪器预约状态查询、仪器使用状态查询以及仪器的远程控制等。微信企业号为仪器的使用者提供方便的查询渠道和便捷的仪器使用途径,扩大了仪器共享的宣传,提高了仪器的使用率。

基于层次分析法的我国大型企业原始创新能力评价研究

从原始创新投入能力、产出能力、核心能力、实施能力和原始创新环境支撑5个角度对大型企业原始创新能力进行评价。通过应用层次分析法构建大型企业原始创新能力评价指标体系,得出大型企业原始创新能力相关要素排序。根据排序结果,总结出影响大型企业原始创新能力的主要因素。

中国大型企业综合风险管理战略与模式

在扼要介绍国内外大型企业风险管理研究进展的基础上,阐述了中国大型企业综合风险管理的战略与模式。中国大型企业风险管理起步较晚,体系尚不健全。要从大型企业可持续发展的战略高度,构建由政府、企业与社区共同组成的综合风险管理体系,建立集安全建设、应急管理、风险控制与风险金融为一体的大型企业综合风险管理模式。提出了大型企业综合风险应包括8个方面,即:财务、投资、产销、人力资源、技术、生态环境、灾害与决策风险;构建了大型企业综合风险管理模式,即:完善企业财务风险管理体系投融资风险管理体系与灾害风险管理体系;论证了大型企业实施综合风险管理的主要措施,即:制定综合安全规划、编制综合应急预案和制定综合风险响应计划。

中国大企业自主创新能力的实证测度与分析研究

大企业是国家自主创新的重要生力军,是国家经济实力的基础和依托。本文基于灰色白化权函数定权聚类法构建了大企业自主创新能力的评价模型,并运用AHP法对测度指标进行了赋权,以33个制造业大企业为样本,对其自主创新能力进行了实证测度。结果显示:当前我国大企业自主创新能力总体状况很不乐观,其主要测度指标的表现也很不理想,与世界知名创新型企业尚有较大差距,挑战严峻,形势紧迫。

基于双边依赖性的大型煤炭企业战略联盟结构模式选择模型及其应用

以大型煤炭企业战略联盟结构模式选择为研究对象,分析了结构模式选择的4个主要影响因素,引入治理结构理论,构建了基于双边依赖性的大型煤炭企业战略联盟结构模式选择模型,并用一个实例验证了该模型的可行性和实用性,具有一定的理论和实践意义。

基于管理风险偏好量表的管理风险偏好实证研究——以大型国有企业管理人员为例

风险偏好是风险管理的逻辑起点。针对国际上还没有一套适用于研究企业管理人员风险偏好所需量表的现状,在对偏好、风险偏好及管理风险偏好概念界定的基础上,设计开发出了一套管理风险偏好量表,并对308位大型国有企业管理人员进行了问卷调查,验证了该量表具有较好的信度和效度。调查结果显示,各类管理风险偏好及总体管理风险偏好的分值分布呈正态分布特征;管理人员对不同的风险展示出了不同的偏好;总体而言,管理风险偏好与年龄、职位呈显著相关关系,与性别、受教育程度及所处企业规模无关。