Comprehensive two-dimensional river ice model based on boundary-fitted coordinate transformation method

River ice is a natural phenomenon in cold regions, influenced by meteorology, geomorphology, and hydraulic conditions. River ice processes involve complex interactions between hydrodynamic, mechanical, and thermal processes, and they are also influenced by weather and hydrologic conditions. Because natural rivers are serpentine, with bends, narrows, and straight reaches, the commonly-used one-dimensional river ice models and two-dimensional models based on the rectangular Cartesian coordinates are incapable of simulating the physical phenomena accurately. In order to accurately simulate the complicated river geometry and overcome the difficulties of numerical simulation resulting from both complex boundaries and differences between length and width scales, a two-dimensional river ice numerical model based on a boundary-fitted coordinate transformation method was developed. The presented model considers the influence of the frazil ice accumulation under ice cover and the shape of the leading edge of ice cover during the freezing process. The model is capable of determining the velocity field, the distribution of water temperature, the concentration distribution of frazil ice, the transport of floating ice, the progression, stability, and thawing of ice cover, and the transport, accumulation, and erosion of ice under ice cover. A MacCormack scheme was used to solve the equations numerically. The model was validated with field observations from the Hequ Reach of the Yellow River. Comparison of simulation results with field data indicates that the model is capable of simulating the river ice process with high accuracy.

Coordination Mechanism and Empirical Research on Marine Science Technology Innovation and Marine Eco-civilization:A Case Study of Coastal Areas of China

Marine science technology innovation provides power and guarantees for marine eco-civilization construction,which provides direction and material support for marine science technology innovation.Therefore,the coordinated development of the two is of great significance to the marine economy sustainable development in China’s coastal areas.On the basis of clarifying the connotations of marine science technology innovation and marine eco-civilization in China’s coastal areas from 2006 to 2019,the mechanism for their coordinated development was analysed.A comprehensive indicator system based on the connotation of the two was constructed,and the coordinated development relationship was empirically tested using the coupled coordination model and the panel vector autoregressive(PVAR)model.The results show that:1)the level of China’s coastal marine science technology innovation continues to improve,gradually forming the core of the development of marine science technology innovation in the north,east and south of Shandong,Shanghai and Guangdong;the level of marine eco-civilization development fluctuating upward trend,showing obvious spatial differentiation characteristics.2)The degree of coordination of marine science technology innovation and marine eco-civilization is growing over time.There is no causal relationship between marine science technology innovation and marine eco-civilization in the northern marine economic circle,but there is a two-way causal relationship between the two in the eastern and southern marine economic circles.3)Marine eco-civilization shows a significant positive and continuous impact on marine science technology innovation,and marine science technology innovation shows a long-term,continuous,fluctuating,and lagging impact on marine eco-civilization.The overall role of marine eco-civilization on marine science technology innovation is dominant,and there are significant differences in the impact effects of the two major marine economic circles.

Agent Technology Application in Automating the Coordination and Decision-Making in Supply Chain

Coordinating all the activities among all the parties involved in supply chain can be a daunting task. This paper put forth the viewpoint of applying agent technology to automate the coordination and decision-making tasks in a typical home PC industry supply chain. The main features of the proposed approach, which differentiate it from other approaches, are the following:① In the prototype, the coordination agents have both cooperation and competition patterns; ② It uses JADE (Java Agent DEvelopment Framework) as the agent development environment to realize efficient and reusable agent software;③ It produces some innovative models for the business processes and issues faced by parties in the supply chain. A prototype and the overall process flow were also described.

Research on Coordinating relations between Industrial agglomeration and Regional Technology Innovation Ability in Yangtze River Economic Belt

Based on principal component analysis, coordinated development model and location entropy, this paper analyzes the coordinated development of regional scientific and technological innovation ability and industrial agglomeration level and the spatial differences in Yangtze River economic zone. Firstly, the regional science and technology innovation ability is divided into two parts： innovation input and innovation transformation result. The accumulation of knowledge outside the region is introduced as a variable influencing the correlation effect, and the index system of regional innovation capability is constructed. According to the degree of coordination between the regional technological innovation ability and the level of industrial agglomeration, the Yangtze River economic belt provinces and municipalities are divided into moderate disorder class, serious disorder class, extreme disorder class, middle and lower reaches of the Yangtze River region interregional knowledge accumulation weak.

Study on Modern Agriculture Equipment and Technology Coordinating Innovation

As the material foundation of agriculture modernization, the modernization level of agricultural equipment and technology is the significant signal of agricultural modernization, and the advancement of agricultural modernization is the important content of building a well-off society in an all-around way. Upgrading key technology research ability and promoting agricultural mechanization and industry development not only can shorten the gap between agricultural development level in China and that in developed countries, but also can advance the modernization process of China.

The study of protection coordination technology in power system based on Multi-Agent

This paper studies mainly how to make use of Multi- Agent technology to solve the complex problems which are caused by unsuitable coordination between protection and untimely action and protection fault activity in large power system, and realizes timely the coordination among protections effectively in when losing some or all information. Thus it overcomes the difficult of solving single or shore range information, enhances correspond and coordination among the intelligent protect Agent, raises the stable and reliable property, and promotes the process of power network for large area.

Research on Wireless Monitoring Technology of the Well Site Environment

Based on the characteristics of wireless communication technology and Wireless Sensor Network, this paper studies the well site environmental monitoring system. The relevant hardware and software of the system are designed to monitor the well site environment, thus preventing downhole accidents. The system uses the wireless ZigBee technology as the transmission mode, and combines the virtual instrument technology to design the upper machine interface. The test results show that the system can monitor the outdoor environment in real time. When the environmental parameters exceed the set value, the corresponding location of the LabVIEW interface will send an alarm.

Inevitability and Emergent Problems of Science &Technology Innovation Access to Integration

The causes and the problems of integration of scientific ＆ technical innovation （ISTI） and inevitability are proposed. The status of domestic scientific ＆ technical innovation is analysed. A series of emergent managerial problems caused by the system ISTI （SISTI） are pointed out. Because of Hall three dimensions structure＇s enlightenment, a three dimensional logical net diagram in which the system integration of innovation based on problem in real world but not on disciplinary logic is drawn. The intelligent group＇ s need span is greater under the conditions of relatively low material level than common groups who have lower degree of education. The SISTI is composed by multi-rule and intelligent multi-agent behavior. It is concluded that the logical relationships of integrated technology which based on the author＇s experience and observation must be considerded for a valid management of SISTI.

An Evaluation of the Coupling Coordination of Technological Innovation System in China’s Marine Biopharmaceutical Industry

The marine biopharmaceutical industry(MBI)has been considered as an important part of the blue economy.The high-quality development of this industry depends on the high-level coordinated development of technological innovation system(TIS).In the present study,the coupling mechanism of industrial innovation input subsystem and innovation output subsystem was analyzed for the first time.On this basis,the development level and coupling coordination level of TIS in China’s MBI during 2008-2018 were empirically evaluated with the capacity coupling coordination model.Then,the obstacle factors were diagnosed and recognized with the obstacle model.The results showed that the innovation input index fluctuated at a low level in China’s MBI.The innovation output index has basically maintained a growth trend,whereas the quality of development was not high.Although the coupling coordination level of TIS showed a positive change as mild disordered→primary coordinated→well-coordinated,the development type of innovation system has changed from the lagging output of innovation into the lagging input of innovation.Insufficient input of innovation factors remained the main obstacle to the improvement of coordination level.Based on the above analysis,suggestions were put forward from the perspectives of policy and fund guarantees to improve the coupling coordination level in China’s MBI.

数字技术与高等教育发展耦合协调的时空演化及障碍因素

数字技术在高等教育领域的广泛应用,正成为引领高等教育变革的重要力量,高等教育作为科技创新的源泉和创新人才的摇篮,又进一步推动着数字技术发展。以2013—2022年中国31个省份的面板数据为样本,对数字技术与高等教育耦合协调度及时空演化特征进行探究,结合Dagum基尼系数和障碍度模型深入分析其差异性和障碍因素。结果表明:(1)在样本期内,数字技术与高等教育的耦合协调度水平较低,总体呈现缓慢上升趋势,数字技术系统相对滞后,当下耦合协调的重点是提高数字技术发展水平问题。(2)东部地区的领先优势明显,广东的耦合协调度最高,目前空间差异的重点仍在不同区域间的资源协调及合作,区域合作关系较密切的地区其耦合协调度也较高。(3)我国数字技术与高等教育耦合协调发展形成了技术推动力和高校需求拉动力的作用机制,不同子系统的主要障碍因子为数字产业较为薄弱、数字基础设施仍需完善、高校创新能力欠缺、教学环节数字应用不足等,不同区域障碍因子存在差异。据此,需要采用供给型、需求型、环境型政策工具为数字技术发展增效提速,根据地区间距离远近采取不同方式发挥核心地区辐射扩散效应,从管理模式、评价模式和教学模式3个方面探索高校数字化发展新模式。

统筹发展和安全中的“民参军”——二战后大国技术发展模式及其启示

促进发展和维护安全是世界各国追求的两项重要目标,而技术的军民融合则是连接发展和安全的重要纽带。二战后,苏联、日本与美国的军民融合实践,分别代表了“旋转耗散”“旋转上升”“旋转下降”以及“旋转环绕”四种大国技术发展模式。这四种模式的不同成效表明,要成功地实现军民技术融合,统筹发展和安全,关键在于“民参军”。“民参军”为军用技术提供了负反馈的制约、互补能力的积累以及持续的资金来源。苏联的困境在于缺乏“民参军”,大量军用技术难以外溢到民用部门,最终导致军用部门也缺乏持续的资金支持。日本的经验是技术从民用部门扩散到军用部门,民用部门推动了军民两用技术的发展。20世纪80年代前的美国,服务安全的军用技术逐步外溢到服务发展的民用部门;在此之后,军用技术与民用技术相互渗透,交叉影响。二战后大国技术的发展模式及军民技术融合的成败为中国推动军民融合、统筹发展和安全提供了重要借鉴。

区域科技创新效率测度及分布特征——基于河北省及11地市的实证分析

科技创新是人类社会发展的重要引擎,是发展新质生产力的核心要素。以河北省为例,实证分析了区域科技创新效率的时空格局、区域性差异特征与动态演化趋势。研究发现,河北省域科技创新受技术进步效率、纯技术效率低下影响,创新效率整体偏低,但创新资源配置结构逐渐优化,发展趋势向好;微观市域科技创新区域差异性较大,多数城市处于创新资源结构持续优化阶段,部分城市存在技术进步水平、规模效率较低的问题。为促进区域科技创新协调发展,应发挥比较优势,因地制宜制定科技创新战略;落实京津冀协同发展战略,提升科技创新动力;深化科技创新体制机制改革,破解创新发展制度性障碍;正视发展性差距,促进区域内科技创新协同发展。

科技创新与乡村振兴耦合协调发展分析——以陕西省为例

科技创新是推动乡村振兴和高质量发展的根本动力.通过构建乡村振兴与科技创新耦合协调评价指标体系和评价模型,对陕西省乡村振兴与科技创新耦合协调发展的总体态势和地区差异进行综合分析.结果表明,2010—2020年陕西省乡村振兴与科技创新耦合协调度为0.49~0.79,基本处于勉强协调到中级协调的等级.科技创新与乡村振兴综合发展指数均呈增长态势,但乡村振兴发展较滞后;耦合发展协调度虽不断向好发展,但协调等级依然较低.省内各地市2系统失调区域范围逐渐缩小,协调发展地区增多,乡村振兴发展落后于科技创新.根据研究结果提出一系列提升地区乡村振兴和科技创新水平的政策建议.

ZigBee技术和支持向量机下室内火灾自动报警系统

室内火灾报警系统只能基于少量传感器的数据进行判断,容易受到烟雾、温度等干扰,导致误判率较高。为此,基于ZigBee技术和支持向量机设计一种室内火灾自动报警系统。采用传感器节点采集室内烟雾浓度与温度信息,通过ZigBee路由设备将采集的信息转发至ZigBee协调器内。利用基于负载均衡的ZigBee网络多径路由算法建立信息传输路径,将ZigBee路由设备转发的信息传输至支持向量机处理模块内。使用支持向量机算法处理烟雾浓度与温度信息,获取高校室内火灾类型的发生概率,并与事先设置的判别阈值进行比较,当火灾发生概率大于阈值,自动报警模块会自动发出警报。实验结果表明:所设计系统火灾信息采集精度较高,无线网络生存周期长,具备较优的信息传输效果,且能够有效计算高校室内火灾类型发生概率并自动发出警报。

THE MACCORMACK SCHEME AND THE BOUNDARY-FITTED COORDINATE SYSTEM FOR NUMERICAL SIMULATION OF SUPER CRITICAL FREE SURFACE FLOWS

This paper is concerned with the mathematical model for the numerical simulation of supercritical surface flows. A boundary-fitted coordinate system was used to overcome the difficulties and inaccuracy associated with the determination of flow characteristics near the fl ow boundaries. The MacCormack scheme was applied for the solution of the transfo rmed system of equations. Comparisions between computed results and experimental data show a satisfactory agreement.

Mechanism and Countermeasures for Action of Scientific and Technological Innovation on Integration of Industrialization and Urbanization

In the current process of deepening reform in China,industrial structure upgrading,economic structural transformation and new urbanization are important tasks to promote social and economic development,and technological innovation has gradually become the primary driving force for industrial upgrading,economic transformation and the realization of new urbanization.The article analyzed the action mechanism of scientific and technological innovation on the integration of industrialization and urbanization through qualitative and quantitative methods,found out the prominent problems faced by Henan through the empirical analysis of relevant data of Henan Province,and then proposed the integrated development path driven by scientific and technological innovation.

Computing Depth-averaged Flows Using Boundary-fitted Coordinates and Staggered Grids

A depth averaged nonlinear k ε model for turbulent flows in complex geometries has been developed in a boundary fitted coordinate system. The SIMPLEC procedure is used to develop an economical discrete method for staggered grids to analyze flows in a 90° bend. This paper describes how to change a program in rectangular coordinate into a boundary fitted coordinate. The results compare well with experimental data for flow in a meandering channel showing the efficiency of the model and the discrete method.

Research on Coordination Mechanism in Construction Project Organization

The construction process of modern project is distributed across teams, departments, or systems, each of which is corresponding to a particular project unit. Conflicts often occur in construction project organization because of the improper coordination amongbetween these project units. The primary reason for coordination puzzle in project organization is generally the diversification of culture and technology. In order to enhance the organization’s performance efficiency, good and effective coordination mechanism aimed at diversification of culture and technology is needed. The relationship amongbetween parties and project units is defined and expressed through contract, so construction project organization usually relies on various contracts to deal with its cooperative partner relationship. However, the contractual mode is a defensive method which is more prone to conflicts than the conglomerate of diversification, especially evaluated from the aspects of culture and value. By culture integration—a more flexible way to make up the shortage of contractual mode, a harmonious atmosphere in which organization members can exert their potential ability can be created to help project administrators mitigate organization conflicts and achieve the common goals of project organization. Based on arbitration theory, moreover, this paper puts forward a combined coordination mechanism-hierarchical coordination and nonhierarchical coordination—to resolve the conflicts resulted from diversification of technology. The introduction of intelligent agents system has the advantage of a more systematic and organizational method in reality without causing unnecessary emotional and the behavioural side effects is an effective instrument to utilize this coordination mechanism and realizes its established goals.

“前车之鉴”对教育数字化的启迪

出于对追赶世界一流的渴盼,近代中国长期不懈地关注器物文明。对这种历史实践的反思有助于教育数字化的健康发展。其一,明确教育数字化的指导理念,体用统一而中和,融洽共生而相互作用。教育数字化不应只关注表层的“用”,更应关注内核的“体”,即教育技术文化的进步,由此才能触发深层次的教育变革;其二,应走出技术决定论和物本发展观的误区,认识到物只是发展条件,技术本无力承担变革教育的重任,人的开悟才是影响教育发展的核心因素;其三,教育数字化应树立物与人辩证统一的协调发展观,主要包括发展的主要矛盾与次要矛盾的统一、发展平衡与不平衡的统一以及发展短板与潜力的统一。借助上述的历史启迪,人们能够更为警醒地认识当前教育数字化面临的问题,以便有效地探索其发展道路。

The Relationship between Water Resources Use Efficiency and Scientific and Technological Innovation Level: Case Study of Yangtze River Basin in China

The Yangtze River Basin’s water resource utilization efficiency(WUE)and scientific and technological innovation level(STI)are closely connected,and the comprehension of these relationships will help to improve WUE and promote local economic growth and conservation of water.This study uses 19 provinces and regions along the Yangtze River’s mainstream from 2009 to 2019 as its research objects and uses a Vector Auto Regression(VAR)model to quantitatively evaluate the spatiotemporal evolution of the coupling coordination degree(CCD)between the two subsystems of WUE and STI.The findings show that:(1)Both the WUE and STI in the Yangtze River Basin showed an upward trend during the study period,but the STI effectively lagged behind the WUE;(2)The CCD of the two subsystems generally showed an upward trend,and the CCD of each province was improved to varying degrees,but the majority of regions did not develop a high-quality coordination stage;(3)The CCD of the two systems displayed apparent positive spatial autocorrelation in the spatial correlation pattern,and there were only two types:high-high(H-H)urbanization areas and low-low(L-L)urbanization areas;(4)The STI showed no obvious response to the impact of the WUE,while the WUE responded greatly to the STI,and both of them were highly dependent on themselves.Optimizing their interaction mechanisms should be the primary focus of high-quality development in the basin of the Yangtze River in the future.These results give the government an empirical basis to enhance the WUE and promote regional sustainable development.