Advanced Materials Research Vols. 694-697

Abstract: In this paper, we present a method for the construction of nonseparable and compactly supported orthogonal wavelet bases in ，and orthogonal wavelet bases with this method are nonseparable . The orthogonal wavelets are associated with arbitrary dilation matrix, where is the identity matrix of order and is the arbitrary integer.

Abstract: In order to improve the performance of photovoltaic generating system, an improved interleaved boost converter was used as Maximum Power Point Tracker (MPPT) to match the power with the load. Compared with the traditional boost converter, the advantage of improved interleaved boost converter is high step-up ratio, low input ripple current and improved reliability. Based on this topology, the MPPT control strategy of variable step size perturbation and observation (P&O) method is adopted, photovoltaic array can track the maximum power point by adjusting PWM duty ratio of the boost converter. The simulation results certify the correctness of theoretical analysis.

Abstract: One of the most important way to get nano fiber is electrostatic spinning technology. Electrostatic spinning process can be descripte that polymer solution flow in the strong static electric field. When solvent has be solidificated, Fibrous material is get. All the electrostatic spinning devices are test machines. So it is necessary to finish finite element analysis and optimization of strong static electric working field.

Abstract: The waste rubber from tire have been employed as aggregate in concrete due to their distinct characteristics, such as: less density, drainage properties improve thermal and acoustic isolation in construction, beyond final cost production reduced. This way, the substitution of part of natural aggregate by tire rubber, contributes to the natural aggregates preservation and offer an alternative for recycling this kind of waste. In view of these advantages, this study proposes the utilization of tire waste in projects of Social Interest Housing. The project has as mailing objective the construction of unfamiliar housing (vertical and horizontal) for low income families, searching a conciliation of sustainable development: social, environmental and economic. Social development means the worry with that low income family have a basic infrastructure; environmental development is to minimize the natural resources impact available; and economics is to offer new jobs and costs opportunities. The purpose of study the incorporation of this kind of waste in concretes used for interlocked pavers for floor to construct Social Interest Housing, aims to solve the problems of adequacy of this housings, offering a semi-rigid pavement that have a large use in landscaping for floor manufacturing, low maintenance and do not require specialist worker to their installation.

Abstract: Starting with the relationship between misplaced material of moving sieve jig and the shape of screen aperture, aspects such as generating of misplaced material, machining and manufacturing of screen bar and plate, and opening ratio of screen plate are analyzed and compared when different shapes of screen aperture are adopted including square, oblique line and curved line, a novel concept using screen aperture with a shape of circular arc waves is proposed, detailed analysis and scientific discussion for advantages of the new screen aperture are also carried out.

Abstract: A dual-coil ignition system was designed in order to improve ignition performance of CNG engine. The change rule of ignition energy was studied in voltage regulator tube string simulated load, the change rule of secondary voltage was studied in spark plug load. Experimental results explain that compared with single-coil ignition, the new ignition system can enhance ignition energy, increase secondary voltage, increase spark duration ,achieve multiple discharge and improve coil energy efficiency under apposite charging time to primary coils and discharging time interval to secondary coils. This system can correct discharge characters according to engine working conditions, which is very useful to CNG engine.

Abstract: Extenics theory is used to establish the matter-element model for the quality evaluation of the belt conveyor. Introducing the relational function in the extension set theory to calculate the relational degree, defining the weights of evaluation indexes with AHP (the analytic hierarchy process), and so the quality grade of the awaiting evaluation belt conveyor can be obtained. Taking a type of belt conveyor as an example to study the practical application of the proposed method, the results show that the method possesses a certain practicability. The method can give a reasonable evaluation on the quality of belt conveyor.

Abstract: This paper introduced Bouc-Wen model to describe the elasticoplastic deformation of compacted soil on horizontal excitation, converts it to a direct polynomial expression using Taylor Expansion based on one order approximation. A 2-def dynamic model was established in terms of the simplified Bouc-Wen model. According to the first order approximation, the equivalent damping coefficient and equivalent stiffness coefficient were deduced through the harmonic linearization method. By means of numerical simulation, during the beginning of compaction ultra harmonics occur in drum, its spectrums present in addition to the fundamental wave only rich odd harmonics. With the increase of soil density during the compaction process, the slipping of the drum on the soil surface may be induced, the drum occurs from periodic motion to quasi periodic motion, its response spectrums and hysteretic loop would change along with the excitation amplitude-frequency changes. In theory the conclusion of the article is valuable to ensure the compaction quality and improve compaction efficiency.

Abstract: Considering the signal attenuation in deep well affects the use of the new wellbore anti-collision technology based on vibration wave, a kind of borehole seismic source designed. The distance among the risk wells can be identified by collecting the vibration signal produced by this borehole seismic source. The whole device includes energy storage and impact part, control part and auxiliary part. This borehole seismic source bases on the spring energy storage as basic principle. The impact hammer impacts the anvil as the impact institutions. The stuck points consist of arc fastener and arc grooves. The structure is simple and reliable. The function is easy to realize. The laboratory experiment results showed that this mechanical borehole seismic source can generate certain intensity and independent signals. The volume of the impact strength can fulfill the basis prevention warning of the monitoring the wellbore collision in deep layers.

Abstract: Combined with a low temperature methanol wash unit tower equipment lifting practice, analysis the integral lifting method of large equipment selection, process route establish and lifting machines and tools selection and lifting scheme optimization, and points out that the heavy machinery used in large equipment lifting is the direction of future development.