Advanced Materials Research Vols. 482-484

Abstract: The present study explores the access of subway integrated supervisory and control system and all levels of mechanical and electronic subsystems, and discusses the network structure scheme of subway integrated supervisory and control system. After analyzing the merits and disadvantages of all kinds of network structures, the networking problem in subway integrated supervisory and control system that needs urgent solution has been raised.

Abstract: Construction monitoring of excavation engineering is important in verifying design theory and guiding field construction. It plays a significant role in safety management of construction, deformation control of supporting structure and safety assurance of surrounding buildings. A construction monitoring of a deep foundation pit in urban village is carried out. The observation datum are reviewed and analyzed. It is found that the process of high pressure water-rushed hole by single tube and poor piling result in silt are two main reasons for large deformation observed in supporting structure and surrounding ground.

Abstract: The presence of long-lived radionuclides is a challenge to the management of high level liquid waste (HLLW). Separation of minor acitinides and long-lived fission products from the HLLW by partitioning process has the potential of significantly decreasing the costs of the immobilization and disposal of the radioactive waste by minimizing waste volumes. Several solvent extraction processes have been developed and demonstrated at the Institute of Nuclear and New Energy Technology (INET) for the separation of transuranic elements, ⁹⁰Sr and ¹³⁷Cs. In this work, using modified zeolite molecular sieve as a sorbent carrier, four kinds of solidification were prepared by soakage- absorption- calcination methods. It was found that the sample (HZCS-75) calcinated at 750°C was formed pollucite, a zeolite mineral, which will provide an option to immobilize the radioactive cesium and strontium.

Abstract: In this paper, the finite element method (FEM) is used for simulation of piercing process of the tube in Mannesmann mill. The sensitivity of the simulation results to numerical methods and physical parameters is discussed. The simulated results visualize dynamic evolution of force in the piercing process. The stability of the process and force condition is analyzed by FEM simulation. The model is verified by comparing the values of calculated force parameters and those measured in laboratory conditions. Finally, the future plans are presented.

Abstract: In this paper, we consider the non-oscillatory solutions of linear delay functional differential system of neutral type, from which we obtain some new sufficient conditions of non-oscillation.

Abstract: With the reform of employment system for graduates，college graduates have more decision-making power when choose jobs．Besides，the labour relations with the men of contract provide premise and condition for graduates pursuing maximum benefits．The process of graduates employment-decision is a kind of rational behavior which should weigh gain and loss carefully．Facing with a variety of opportunities, graduates are generally at a loss how to make a strategic decision．Aiming at such situation，we should first analyse the factors that influence job-decision objectively，then apply the Analytic hierarchy process method to decide the weight of each factors，finally，we can use the comprehensive evaluation method to choose a satisfied job．

Abstract: Position on the planet has always been vitally important to human beings and today our exact position is something that we can obtain with ease. Among the most stunning technological developments in recent years have been the immense advances in the realm of satellite navigation or Global Navigation Satellite Systems (GNSS) technologies. There are various causes of measurement error. The precision of positioning with GPS navigation depends on the one hand on the precision of the individual pseudorange measurements and on the other hand on the geometric configuration of the satellites used. In order to achieve an accuracy of one meter or better, additional measures are necessary. Reducing the effect of measurement errors can considerably increase the positioning accuracy. Differential GPS (DGPS) is a method for reducing the measurement error of GNNS.

Abstract: This paper applied the Taguchi method to simulate the latch-up effect of nLDMOS to achieve an optimization design. The applied model is for an nLDMOS structure with high voltage well plus the adaptive (adjustment) layers of source & drain, and an N-type buried layer. Although the methods we could choose is abundant, we hope to effectively obtain the data which is useful for statistics in order to judge the correct characteristic of parameters. We applied the Taguchi method to perform an optimization in the paper. There are six parameters with two levels in this work, so we choose the Taguchi table to be L₈(2⁷). By this way, it can decrease the times of experiment much effectively.

Abstract: Assembly Language is an important specialized core course for the computer majors, which is also difficult to be taught. This thesis analyzed present teaching state of assembly language based on features of assembly language and the actual conditions of students of Henan Polytechnic University. With the study of the important and difficult points of this course and experimental teaching, the author raised relevant solutions.

Abstract: In this paper, flow patterns and mass transfer characteristics of two immiscible fluids in a T-junction circular microchannel were investigated. Four flow patterns, i.e. slug flow, irregular flow, parallel flow and annular flow, were captured by a CCD method, which were resulted from the competition among interfacial tension, viscous force and inertia force. Besides, the overall volumetric mass transfer coefficients ka for the four flow patterns was determined experimentally. The values of ka are in the range of 0.006~0.545s−1 and mainly dependent on the superficial velocity and the flow pattern regime.