Advanced Materials Research Vols. 383-390

Abstract: The article realize the application in breeding center based on the technique of ZigBee and wireless sensor net. The monitoring system can track and monitor the environmental factors and production process which influence the growth of seedling in real-time and continuously. The article introduces the structure and composition of system, the design of software and hardware. The monitoring system is simple, stable in practical application process, which has a very important significance on the management to breeding center.

Abstract: In order to find the controlling factors of slope stability and instability criterion for slope engineering, and provide a theoretical basis for developing landslide control technique, the regression function and regression parameter were obtained by applying the generalized least square method, and the partial linear model was derived after the regression analysis for the slope horizontal displacement and monitoring time by using B-spline method. The front several terms of the Taylor’s series were intercepted after the function of the partial linear model was expressed as Taylor’s series expansion. The cusp catastrophic model was eventually obtained by means of variable substitution, and the risk of landslide would be recognized with the aid of the catastrophic criterion. The method of landslide forecast was verified by the field monitoring data.

Abstract: Because of a great many of advantages with gas hydrate slurry, it can be widely used in air-conditioning system as a candidate of conventional secondary refrigerants. In this paper, three methods of producing gas hydrate slurry expressed as continuous stirring, water spraying and gas bubbling are introduced and the characteristics are discussed. The progresses of hydrate slurry at home and abroad is also presented briefly.

Abstract: Waste water from enzymatic biodiesel technology (contained glycerol 5%) is treated as following: Firstly, waste water is filtered with a gauze, add KOH to PH=7~8, and filter to remove salt soap. Secondly, the processed liquid distil at 50°C in Rotary Evaporator vacuum to remove most of water and methanol, then concentrated solution use plinthic flocculants (mass ratio of 100:1), stirring at 70°C to eliminate colloid. Finally, at 180°C, 0.8 kPa to vacuum distil to collect glycerol of purity up to 90.43％.The glycerol react with acetic acid to get glycerol triacetate with phosphotungstic acid catalyst, toluene as water-carrying agent. Thus comes out the yield of more than 90％ glycerol triacetate in 6 hours.

Abstract: This paper experimentally investigates effects of speeding-up inlet on rotational speed of marine current energy turbine. Several length-radius ratios L/d and area ratios A´/A of the speeding-up inlet as well as several flow yawing angles θ were considered. Also, a comparison of rotational speed of turbine in the presence and absence of speeding-up inlet was made. A relation between flow velocity V and rotational speed of the inlet n was analyzed. And a relation between flow velocity and rotational speed of turbine in free stream was theoretically developed.

Abstract: The main objectives of this work are to experimentally examine the enhancing mass transfer performance of FeO nanofluid on the bubble absorption and to find the optimal method to design highly effective compact absorber for NH₃/H₂O absorption refrigerator. Based on the microcosmic analysis of the factors affecting the stable performance of nanofluid, FeO nanofluid was prepared by using the ultrasonic dispersion method. The ammonia bubble absorption experiments with FeO nanofluid were carried out and the data of absorption height were acquired. The results showed that FeO nanofluid had an enhancing effect on mass transfer performance, and the absorption height was 2mm higher than that of the water based solution in 2 minutes of the experiment conditions. The curves of the solution temperature in absorption were also given. According to the data of the absorption height and the solution temperature, it is pointed out that there are two factors which might have negative influences on the mass transfer enhancing process.

Abstract: This paper develops measures, based on the Malmquist productivity index, that enables the decision making units internal efficiencies from those associated with their group characteristics. It has been assumed that the levels of inputs and outputs are not known exactly. The analysis involves the construction of an index reflecting the relative performance of example, which can be decomposed into an index for the comparison of efficiency change index and an index for comparison of technological change index. We provide a computational method for extension the Malmquist index group A relation to group B interval data. The utilization of the proposed approach is demonstrated with an illustrative example.

Abstract: Available-To-Promise (ATP) function is an important tool in supply chain management to enhance the responsiveness of order promising and the reliability of order fulfillment. ATP models provide responses to customer order enquiries, based on resource availability, allowing the user to determine whether they should accept the order. Currently, many of the ATP models available adopt a deterministic approach and do not address uncertainties in the manufacturing environment. In this paper, a fuzzy mathematical programming model is proposed to address the problem of order-promising under an environment of supply uncertainty. The model aims to minimize the cost of rejecting orders, failing to meet promised orders and inventory holding cost of the finished products and supply materials. In addition to order promising, the model also performs order-fulfillment and provides a master production schedule of each product and material requirement planning of each supply material over the given planning horizon. To solve the fuzzy mathematical model, an approach based on possibility and necessity theory is applied.

Abstract: A pipe structure model composed of straight pipe, bent pipe, concentrated mass and flexible support was established. The axial, lateral and circumferential vibration of this model were taken into account in the paper. Then it was realized to calculate the natural characteristic of this pipeline in computer by using MATLAB language to program a series of procedures based on frequency-domain transfer matrix method. The calculation results were compared with the ANSYS simulation results, which illustrated the upper accuracy of frequency-domain transfer matrix method in calculating natural characteristic problems of pipeline structure system. At last, The pipeline system was analyzed with experimental modal method．By comparing the experimental results and computational results, relatively lesser error showed that computational results were reliable and frequency-domain TMM was verified to be valuable for practical application.

Abstract: Most of the literature on scheduling problem only focuses on how to obtain the optimal schedule in static environment. However, when the schedule is carried out in job shop, it always meets with varied disturbances. These disturbances will make the schedule’s performance different from the pre-obtained schedule, and make the original schedule invalid. In this paper, the varied disturbances which always appear during the performance of schedule are studied. The repair methods responding to these disturbances are analyzed which are classified into three typical kinds. Using these three kinds of repair methods, the usual disturbances during scheduling can be repaired. And a right shift rescheduling method is proposed to reschedule the initial schedule.