Advanced Materials Research Vols. 433-440

Abstract: Chain enterprises are one of te two big marks of "modern circulation revolution"; it plays a irreplaceable role in the economic development. Not only did the chain operation in flow initiate a new distribution channel, but also established a new mode of operation in logistics. This paper analyzes the existing problems in managing logistics cost of chain enterprises, and advocates concrete methods of the control on logistics cost.

Abstract: In the age of intense competition, a universal principle is survival of the fittest. Of course, this principle is also applicable to the development of any enterprise. So, in such social environment, only by continuously reforming to adapt to social development and continuously innovating, enterprises can win end users and improve the overall strength of enterprises. Network marketing, a product of the information age, plays an important role on enhancing enterprise competitiveness.

Abstract: From the practical point of view, the paper researches the optimal and dynamic distribution optimization scheduling model, and explores the dynamic scheduling strategies of optimal scheduling model and GIS. At the same time, it also gives the formal distribution definition of the distribution optimization scheduling model, studies the model algorithm and analyzes performance of algorithm by means of examples. Finally, the article also designs and implements a logistics distribution allocation dispatching prototype system according to business needs of logistics distribution companies.

Abstract: Aiming at the financial indicator of the enterprises, this article analyzes and builds the evaluation indicators system of the business financial condition made up of first-level indicators consist of basic survival capacity, risk management capacity, competitive power and growth ability, two-level indicators consist of earning capability, capital operation capability, debt paying ability, cash flow generation, intangible resources capability, value expression ability, assets increasing ability and earning capability and 11three-level, which improves and supplements the traditional evaluation on the business performance, emphasizing the evaluation on such aspects as the capital capability, intangible assets capability, value expression capability and growth ability and mastering the essence of the development ability better.

Abstract: The article analyzes the stability of agro-ecosystem’s productivity taking sustainable development theory and wave theory as guideline, conducted field study of the research area taking ** as research case based on analyzing ** yearly grain output, and establishes relatively complete, clear and easy accessible evaluation target system for agro-ecosystem productivity stability through analyzing the constraints of the stability in the area and making full use of current statistical data with combination with actual situation. The evaluation system is set to be 4 layers with 17 indices as per Delphi and AHP method and comprehensive weight of each index is determined. It analyzes the stability of agro-ecosystem productivity from the aspect of both time and space with current indices and standardized data using synthetic index method and volatility index calculation method.

Abstract: Digital signal processing is used to focus the image and obtain a higher resolution than achieved by conventional radar systems. This paper presents details of Synthetic Aperture Radar (SAR) signal processing and imaging technique with the goal of generating images. A Matlab based program is developed and coded for imaging simulation. It facilitates processing data and producing desired output. Then, we investigate the characteristics of Linear Frequency Modulated (LFM) signal prior to getting image results. The SAR properties in range and azimuth directions are described. The received signal and SAR raw data is theoretically described. In addition, the target reflection signal processing is also well presented. The SAR image formation is described using Range Doppler Algorithm (RDA). Finally, simulation parameters are computed and imaging simulation test is finished.

Abstract: This paper presents the error probability analysis of Time-Hopping Biorthogonal Pulse Position Modulation (TH-BPPM) ultra-wideband (UWB) systems with a RAKE receiver over indoor multi-path fading channels. UWB signals suffer from severe multi-path interference when employed in an indoor fading environment. A RAKE receiver can be used to improve the performance of UWB systems. TH-BPPM has attracted much attention in recent years due to its many advantages, such as low probability of error and low complexity. In this paper, the IEEE 802.15.3a indoor channel model is employed to analyze the performance of TH-BPPM UWB systems with different RAKE receivers. The bit error rate (BER) of ARake, PRake, and SRake TH-BPPM UWB systems is derived. The results indicate that ARake has the best performance, SRake is better than PRake when the number of fingers is same.

Abstract: In this work we present an optical laser based method for characterization of periodical microstructure. It allows indirect evaluation of geometrical and optical parameters of periodical microstructures. Proposed method is applicable for optimization and control of technological processes in the cases when traditional measurement techniques are not suitable. The main experimental results are compared with the computer simulations where the standard programs PCGrate-SX6.0 and and GSolver V4.20b were employed. Error of estimation of geometrical parameters of periodical microstructures by comparing theoretical and experimental values of diffraction efficiencies of periodical microstructures is less than 5%.

Abstract: Based on finite element Method a dynamic mathematical model is established, and the simulation of stress distribution around the defects of single crystal nickel-based superalloysis also established with ANSYS. After the change of stress field with time is analyzed, the result is compared with that achieved through numerical calculation and experimental analysis. The comparison shows that the finite element method is effective to study the stress distribution and can provide basis for creep features and microstructure evolution.

Abstract: Rotary ultrasonic machining is a hybrid machining process that combines diamond grinding and ultrasonic machining. The mathematical predictive material removal rate models have been developed in rotary ultrasonic machining with a constant pressure. However, there is no report on mathematical predictive cutting force model in rotary ultrasonic drilling at a constant feedrate presently. Since cutting force can not only reflect the processing state, but also affect the machined surface quality, it is necessary to develop a mathematical model for predicting cutting force which can forecast the machining results. This paper presents a mathematical model to predict the cutting force in rotary ultrasonic machining. On the basis of this model, the relations between cutting force and controllable machining parameters are researched by numerical computation method. This paper also researches the influences of spindle speed and feedrate on cutting force by experiments. The results observed through the experiments agree well with the relations generated from the mathematical model, which verify the developed model.