Advanced Materials Research Vol. 933

Abstract: Fluorescence emission mechanism of biological tissue is very complex, and related researches have very important significance. Spectroscopy of many biological tissues has been used in clinic; this paper attends to study the mechanism and its implementation pulse electromagnetic fields. We than study the pulse electromagnetic field effect on blood brain barrier of rat by fluorescence spectral properties, which caused by the fluorescent material only could through loose membrane, the results show that pulse electromagnetic field could effect the fluorescence properties of brain in rats, mechanisms of these phenomena also analyzed.

Abstract: This study took three factors three levels orthogonal experiment scheme and chose PAM as the coagulant, pretreated a pharmaceutical factory wastewater by chemical coagulation method, and the results indicated: when coagulant dosage was 50 mg/L, pH was 5 and mixing time was 20 minutes, the removal efficiency of SO₄^2- and COD could be 39.0% and 72.5% respectively. The water quality could meet the requirements of the subsequent treatment processes.

Abstract: The purpose of this paper is to present the use of uniform design of experiments method and dynamic finite element analysis in improving the permanent deformation of an on-road bicycle frame which undergoes the drop-mass impact test. Firstly, four dimensional parameters of the bicycle frame are selected as the control factors to be improved. Then, uniform design method is used to construct a set of experiments. Each experiment denotes a specific design of frame. Next, for each experiment, the dynamic finite element analysis package ANSYS/LS-DYNA is employed to simulate the behavior of bicycle frame which undergoes the drop-mass impact test and determine the permanent deformation of the frame. Lastly, the best frame of all the experiments which causes the smallest permanent deformation is selected as the improved version of design. Compared with the original design which causes a permanent deformation of 8.458 mm, the improved version causes a permanent deformation of 7.467 mm. The rate of improvement is 11.7 %.

Abstract: In this paper, an algorithm of combining the Coherence Factor Thresholding (CFT) method, Amplitude Deviation Thresholding (ADT) method and Intensity Index Thresholding (IIT) method ( Triple Thresholding: TT algorithm) is designed, which can be applied in the identification of PS points in the PSInSAR algorithm to monitor the ground deformation, On the basis of analyzing and comparing the deficiency of each identification method, the detail flow of the TT algorithm has been designed, which will perform more suitable to monitor the ground deformation theoretically. The real data experiment using the algorithm will be carried out in further work.

Abstract: The mechanical fuzzy reliability models based on cut-set method have been applied to many fields in engineering. The reliability analysis results are affected by the cut-set distribution. In this paper, a basic mechanical fuzzy reliability model using cut-set method was established. Based on this model, the deficiency of the three previous cut-set distributions, i.e. uniform distribution, linear distribution and truncated normal distribution, was analyzed, and a new cut-set distribution named modified truncated normal distribution was proposed. The analysis results showed that when the cut-set is long enough, the reliabilities of the fuzzy models with the three previous cut-set distributions tend to a fixed value which has nothing to do with the specific mechanical structures, which makes the models have no good convergence and unreasonable. While, the fuzzy reliability model with the new cut-set distribution proposed in this paper can converge well to the classical random reliability model. Moreover, the reliabilities of a stress-strength interference problem and a resonance problem were assessed as two examples to verify the theoretical analysis results, which indicate that with this new cut-set distribution, the fuzzy reliability models have better convergence and wider applications.

Abstract: Analyze the stress mechanism of micro-pile and existing mechanism, and come up with the analytic method of pile-soil-(foundation) pile cap interaction grounded upon penetration deformation of pile ends and compression of soil between piles. Hyperbolic model is adopted to simulate the development of tip resistance and side resistance in accordance with deformation to reflect the nonlinearity of pile-soil work, Boussinesq solution is utilized to calculate the stresses generated in soil by foundation (pile cap) plate, Mindlin stress solution is used to calculate the stress produced in the soil between piles by side resistance and end resistance, and the stress of soil is the superposition of the two solutions. Through iterative calculation analytic program RTLOAD for the sharing ratio of a single pile is compiled through VC++.

Abstract: A new style single outlet downhole hydrocyclone desander with spiral deflectors was designed according to the working characters of downhole desander, which combined hydrocyclone separation and sediment separation. Numerical simulation was conducted to analysis effect of produced liquid viscosity on flow characteristics and separating property. The results show that the tangential velocity of hydrocyclone desander decreases rapidly and the axial velocity and radial velocity of hydrocyclone desander changes slightly when the produced liquid viscosity changes in the range of 1.5mPa·s ~ 30mPa·s. Separation efficiency drops sharply and pressure drop decreases slightly with the increasing of produced liquid viscosity.

Abstract: Caving technology means to dig a big stable cave in CBM after drilling a hole in order to eliminate coal bed pollution, link well holes most with the coal bed and keep medium in reserve. Caving technology can raise the collection efficiency of coal seam gas. The water jet-mechanical caving tool in CBM designed in this paper can make high pressure mud open knife shafts, make high pressure mud flow through spray head to drill the coal bed and make bit mechanically drill as well. The general design of caving tools structure is provided in this paper. Movement design of knife shafts which are the basic components in caving tool and optimal internal diameter of hydraulic cylinder bottom are given in this paper as well. The work can lay a foundation of latter detailed design of caving tools structure.

Abstract: In order to improve the efficiency of warehouse on picking, an optimal model for ware location assignment is presented, which is with multi-objective function. To solve the multi-objective optimization problem, a differential evolution algorithm combined with lexicographic sort algorithm is presented. In order to verify the above algorithm, an example is presented. The calculated results show that the algorithm is operable and versatile. The optimized solution can be found fast with better fitness than genetic algorithm which is used to be compared.

Abstract: As more and more sidetracking old wells are required in mature fields, a lot of applications in casing window milling technology, such as drilling for unconventional oil and gas, multi-lateral wells and laterals, are applied. In this paper, the mechanical properties of the BHA in different stages of window milling for sidetracking are analyzed in detail. Based on the commonly-used vertical and horizontal bending analysis, mechanical analysis models of BHA with three bits for windows milling are proposed. With these mechanical analysis models, different mechanical parameters of window milling BHA at different stages during the window operation can easily be calculated. The research achievement in this paper is helpful not only to understand the relationship between drilling parameters and drill string, stress and deformation of bits, but also to predict the side force and direction of bits and to determine the size of the drill string deformation. It can also provide references to BHA design and the selection of sidetracking operation parameters.