BOF-caster matching model in steelmaking plant of all plate and strip using precision design principle

Using precise design principle, a multi-objective programming mathematical model of the BOF-Caster matched is established for single production line in the steelmaking plant of all plate and strip, according to the segmentation of steel grade and product specification of product mix. Objectives of the model have less investment, less difference between production capacity of the converter and continuous caster, higher operating rate of converter and higher level of weighted average casting speed. The model is solved by the improved delaminating sequence method. Then, the overall configuration method of BOF-continuous casting in the steelmaking plant is proposed through integrating single production lines. According to the production outline of a new large steel plant, the result of the model shows that the configuration scheme of the steelmaking workshop of the steel plant is a better design scheme.     

An Algorithm to Enhance the Performance of Data Service Over CATV Broadband Networks

Emerging CATV networks are evolution to Hybrid Fiber/Coax plants. It is widely believed that the HFC network will play an important role in providing broadband accessing service to subscribers due to it's large excess bandwidth and high penetration to the home. Asymmetry broadband data service is the main service provided in the HFC broadband access networks now. It's performance will determine whether the subscribers be satisfied or not and affect the growth of HFC broadband access networks. The authors outline the mechanism of transmitting data in the upstream channel of the HFC network, and analyze how it affecting the performance of data service. The performance of data service and TCP protocol in HFC network is examined. An optimal scheme of bandwidth allocating algorithm for the upstream channel is proposed to enhance the performance of the data service over these networks.     

A TTL limited scheme to reduce PREQs broadcast storm

In the tree network of IEEE802.11s using HWMP (hybrid wireless mesh protocol)as its routing protocol,PREQs (path requests)are simply flooded for maintaining the routes between leaf nodes,which causes PREQs broadcast storm problem. This paper proposes a TTL limited scheme to solve the problem. The scheme designs a method to grade the leaf nodes. With the help of table-driven routing in HWMP,the leaf nodes are divided into different grades according to their hop counts to the root node and the grade information is synchronized in the network. The source node no longer uses the default TTL in HWMP when sending PREQ,instead,it sets the TTL of the PREQ to the sum of its own grade and the destination node’s grade. Theoretical analysis and experimental results show that the scheme limits the delivery distance of PREQs and outperforms HWMP at overhead,loop delay,package loss rate and throughput in static tree network if the sum of the source node’s grade and the destination node’s grade is not large.     

Low complexity rate control scheme for real-time video coding

Considering the deficiency of H.264 rate control scheme and the coding efficiency requirements for real-time encoding,a low complexity rate control algorithm in MB-layer is proposed..MAD is predicted by combining motion vector and the temporal and spatial correlation to reduce the complexity of G012-MAD prediction algorithm from linear regression to the complexity of the weighted average. For the rate-distortion model,the linear model with low computational complexity instead of the quadratic fitting algorithm in G012 is used,while the possibility of is discussed combining with SSIM. For the fluctuation of the PSNR of the coded image with large movement,the determination of QP in GOP layer and the bit allocation of P frame are improved,and the current quantization parameter is adjusted by making full use of the information of coded MBto control the rateeffectively. The experimental results show that the algorithm is more effective in resisting the fluctuation of PSNR for smoothly output sequence,and can decrease computational complexity.     

Computer Aided Analysis Tool for Building Energy Efficiency in Conceptual Design Stage

Conceptual design is one of the most important stages in building design, and energy efficiency analysis is one of the key issues in building conceptual design stage. The existing energy efficiency analysis methods and tools require inputing large number of parameters. However, the detail information of most parameters is not identified at the stage of conceptual design. And the current prevailing energy consumption simulation methods and tools are not appropriate at the stage of conceptual design. The proposed method can be used to compare the energy efficiency of multi strategies at the conceptual design phase. Minimum data were required to be input for achieving the optimal building design scheme. The method can provide a solution to the gap between the rapid building design cycle and the sustainable development demand in China.     

Smoke Management Systems for Large Volume Space

Atria and other large volume space do not have the compartmentation that has traditionally been a major contributor of fire protection.The effectiveness of sprinklers in these large volume spaces is limited. For these reasons, smoke management systems for large volume spaces is of particular importance. Their primary goal is to maintain an enviroment in which the impact of smoke and heat on occupants is not life threatening. This involves keeping the height of the smoke layer above the highest level of occupancy for a defined period of time, longer than the expected time to evacuate the building. Three approaches to these systems are smoke filling , gravity smoke venting ,and smoke exhaust .This paper describes the design approaches to smoke management to achieve fire safety in atrium.     

Robust Adaptive Control Based on On-line Identification to Multi-parameters

In system controlled,Sampling these parameters and with parameters for controller in time, it is an object to adaptive control. The article presents a scheme that the structure parameters on it's model and model parameters is robust identified by on line, while to optimal of algorithm on adaptive control is fulfilled. In control scheme, method of intelligent identifying to the structure parameters(levels of model) and algorithm of robust pole placement are introduced also It is advancer for already mentioned scheme. Whole scheme presents new model on adaptive control.     

One Scheme About Small and Medium-sized Enterprise''s Planning Control

In the market economy, it is an essential problem to be solved for a company in the information process to optimize its resources and achieve the best economic profit by means of integrated management and careful planning. Planning plays the core role in the process. This paper puts forward a scheme for the design and simplification of the planning control system for small and medium-sized companies. With the combination of the two planning models, MRP II and JIT, the paper offers the framework of the planning control scheme and the designing ideas and analyzes the main functional templates in detail.     

Dependency of Material Removal Rate on Velocity in CMP of Microelectronic Materials

The relative motion law of the particles in slurry, with respect to the processed surface of the silicon, during the chemical mechanical planarization (CMP) of microelectronic materials is firstly discussed. The equations depicting the scratching traces of the particles in slurry on the surface of the silicon, which depend on the rotational velocities of the silicon and the pad, are obtained. It is concluded that when the silicon and pad rotate with the same rotational velocity, the material removal rate (MMR) is proportional to the rotational velocity. As an example, the scratching traces of the particles on the processed surface of the silicon are given out in the case that the rotational velocities of the silicon and pad are the same. The results are important for the understanding of the mechanism of material removal in the CMP of microelectronic materials.     

Research and Development of the Network Virtual Instrument

This paper introduces a basic concept of network virtual instrument and presents a solving scheme based on the .net framework for web network virtual instrument in which the component technology are used to construct UI component, data-service component, signal-processing component, DB-component, controlling component and data-acquiring component, in accordance to demand these component above can be flexibly put on the right place to realize remote test and control. In the light of the scheme, a set of network oscilloscope based on web is designed to remotely sampling data, and the technology of data base is successfully used to administer the saving and taking of signals in network virtual instrument .     

EDM Lettering Technology of Large-scale Workpiece'' s Surface

The actuality of lettering technology on workpiece's surface is introduced from domestic and abroad ,and the principle of using EDM to carve characters on large-scale workpiece's surface are analysed at economical and technologic point of view. The technologic scheme is put forward according to the principle of EDM and the character of EDM lettering on large scale workpiece's surface,which is based on headstock and electrical source control tank of minitype EDM tool. The key technologies, the whole makeup,the motion between electrode and workpiece at three coordinates, precise orientation of electrode and cycle system of work liquid are emphatically studied. Finally,an special EDM lettering tool of lager scale roller for a large scale iron & steel enterprise is briefly described. The application indicates that the technologic scheme is economical and useful,and the EDM lettering tool is stable and reliable.     

Combined Network Model for Occupant Evacuation in Building Fires

Safe evacuation is the most fundamental requirement of fire safety measures in buildings. Many computer based evacuation models have been developed to quantify and model human movement in the buildings. Two methods are usually used to represent the building enclosure in these models: fine and coarse networks. This paper presents a fine network model and a coarse network model based on these methods respectively, and develops an integrated network model that integrates both network methods for efficient and detailed assessment of evacuation in large and complex buildings. To demonstrate the advantages of using the integrated network model, the results of its simulation for a high rise office building and a large shopping mall are discussed and compared to the simulation results of the fine network model and the coarse network model. It shows that the integrated model can be used to simulate evacuation in large and complex building and is adequate in representing details of the evacuation process.      

PFI-Private Finance in Public Works

PFI is one of the novel approaches for the private finance in public works. The initiative aims on encouraging the private sector to undertake infrastructure projects and the provision of services on a project basis, rather than by the traditional means of procurement. PFI has been widely applied in a large number of fields in public works of government. PFI has become one of the government's main instruments for delivering higher quality and more effective public services. Two of the principal tenets of PFI is: the first is to secure value for money for the public sectors and the second to transfer the ongoing risk in the continued delivery of a service away from the public sector to the private sector.     

On the Iteration of Fixed Points for Generalized Quasi-contractive Mapping in p-convex Metric Spaces

The purpose of this paper is to define an Ishikawa iterative scheme for generalized quasi-contractive mappings in p-convex metric spaces and to prove that this iterative scheme converges to the unique fixed point of generalized quasicontractive mappings in p-convex metric space. The results presented in the paper generalize and unify the corresponding results in given by Liu Qin-hou, Xu Hong-kun, Ding Xie-ping, H. E. Rhoades, et al.     

Design of the Intelligent Alarm System in Controlling the Automobile Speed

The alarm system in controlling the automobile speed is presented, without change of the original structure, and the design scheme of the system implements sampling, measurement, computing, real-time alarm and delay-time control for the automobile speed according to the safety of the automobile driving. Then, the speed is randomly stored so as to insure the correct data and to effectively analyze the data. Especially, the key techniques of the speed measurement and the refresh storage are pesented in datail in the system.     

Cutting Wheel Structure Selection of EPB TBM and Its Adaptability Evaluation in Large Particle Size Gravel Strata

Large particle size gravel strata layer is very difficult for TBM construction which brings about a series of problems for EPB TBM advancing in Beijing Metro. Cutting wheel is an important component of EPB TBM and cutting wheel with reasonable structure is essential for EPB TBM to advance steadily and effectively in large particle size gravel strata. In-situ EPB TBM advancing tests are carried out in large two adjacent shield interval where the strata conditions make it possible to find out the most efficient cutting wheel structure by monitoring key parameters through Real-time Information Management System. Based on the analysis and comparison of advancing efficiency, strata adaptability of key parameters and tools wearing, the following conclusions can be obtained: 1) Spoke cutting wheel has better strata adaptability and higher efficiency than panel cutting wheel as well as more advantages in controlling tools wearing. 2) open ratio ranging from 55% to 65% is the reasonable for cutting wheel. 3) Advancing speed and earth pressure are very important for EPB TBM construction. Compared with panel cutting wheel, spoke cutting wheel can obtained higher advancing speed and more stable earth pressure in tests. However the change of earth pressure should also be paid attention when EPB TBM advancing in fast speed. The advancing speed should be controlled in the range of 20 to 60 mm/min.     

Development and application of comprehensive testing and evaluation system for machine tool remanufacturing

Based on the practice of machine tool remanufacturing, a software system is developed to support the processes of comprehensive testing and evaluation for machine tool remanufacturing. The software is composed of function models of comprehensive testing and analyzing, redesign and evaluation based optimization. Based on the test of used machine tools, the redesign scheme of machine tool remanufacturing is presented. In addition, the scheme is evaluated in terms of technology, economy, resource consumption and environmental impact. An example of the used lathe remanufacturing is given to illustrate the application of the system.     

Analysis of a New Distributed-Pump Scheme Applied in District Heating Network

It is helpful for energy efftciency to use distributed pumps instead of valves to regulate hydraulic balance in a district heating system (DHS). A new scheme of distributed pump-system is presented based on performance comparison of hydraulic regime and power saving of single-heat-source dendritic pipeline networks with regulating valves and/or distributed pumps. Supposing that the new scheme was employed in multi-sources looped-pipe network, theoretical analysis and case study were carried out to evaluate off-design performances including hydraulic self-regulation, supply water temperature stability and power-saving potential. The results indicated that the proposed scheme would contribute to minimizing power consumption, retarding water temperature change, and would be convenient to adjust the quality and quantity independently in the looped-pipe heat supply networks.     

Boundary Element Method for Time-dependent Chloride Diffusion and the Chloride Distribution in Concrete

The process of chloride diffusion in concrete is time-dependent.The boundary element method (BEM) with a time-dependent diffusion coefficient is presented for chloride diffusion in concrete based on the suitable transformation of variables.The fundamental solution of the partial differential equation for time-dependent chloride diffusion in concrete is developed,and the compensation length of the diffusion field is defined as well as the compensation coefficient.The scheme of BEM with a time-dependent diffusion coefficient is developed.Two examples are given to demonstrate the accuracy and efficiency of the presented method and the rationality and the importance of the compensation length for the method.     

Seismic Performance Analysis and Optimum Design of RC Frame Structure Retrofitted by Viscidity Dampers

For a reinforce concrete frame structures which is not satisfied the standard for seismic appraiser of building, viscidity dampers are used to retrofit the structure. Four reinforce schemes are selected in which six same viscidity dampers are located at different position of the structure. Compared seismic performance of the retrofited structure with unretrofited one, an optimum scheme where viscidity dampers should better set is obtained. Then the number and technical parameter of viscidity dampers are adjusted, and seismic performance of the structure are calculated. The results are compared and a more economic scheme is obtained because the cost is lowest and the displacement of the structure under earthquakes is satisfied the standard for seismic appraiser of building. Several rules and advices are gotten about how to use the viscidity dampers to retrofit reinforce concrete frame structures. The conclusion about viscidity dampers are useful for similar actual engineering.