Applied Mechanics and Materials Vols. 148-149

Abstract: This paper proposes a wind/PV hybrid energy system matching design method, which is based on backward inference. According to the method, the system can be matched based on the users’ need of energy combined with the local weather conditions and the total cost of the system devices is the smallest. Meanwhile, engineers and designers can work out the power from solar battery and wind turbine which meets the users’ need most economically. The paper uses the concept of “efficient time” which means the time it needs to generate the acquired energy when the generator works in its full power. Based on the users’ need, the power of solar battery and wind turbine can be calculated. What is more, combined with the local latitude and longitude, the best proportion for each kind of energy can be worked out. We take Changchun city of China as an example. It is showed in the result that the backward-inference method is more suitable to the users’ need and we evaluated it by the HOMER program [1], the result proves it is feasible. Also, the result of the method can be used as the input data of the HOMER program for designers and engineers to enhance the accuracy as well as to cut down the design difficulty. In the end, using the theory, our team has developed a system for the Wind/PV hybrid system matching design.

Abstract: The collaborative system for medical image and video analysis used via Internet provides convenience and efficiencies for dental clinic. The CSCW based dental clinic image & video signal processing technology can provide doctors located in different hospitals to achieve a cooperative diagnosis through the dental images tools, telemedicine, and electronic patient records (EPR) and video-conference. It would have very important application value and practical prospect in dental clinic healthcare processing and bring great benefits to small and medium dental clinical healthcare organizations.

Abstract: The STL (Stereo Lithography) model is based on the triangular facets of 3D surface description model. This article studies the processing cutter path calculation of the STL model sculptured surface manufacturing: It proposes the full grid quad-tree partition method for surface of the triangular grid model. The sculptured surface is classified by quad-tree partition with projection plane for cutter location point calculation to give a fast search algorithm. Take tooth surface for example, the feasibility of the algorithm is verified according to the study of cone-shaped cutter tool path generation algorithms and also by the grinding test.

Abstract: The energy-saving technology of the transport is still in its infancy. It has some questions about the evaluation and the promotion. Which lead to excellent energy-saving technology turn into productive forces can not be timely. In this case. The paper establishes the energy-saving technology evaluation index system by the Delphi; and calculated the evaluation index weights of each factor by the AHP. Finally, the paper proposed the evaluation method of the energy-saving technology which based on fuzzy comprehensive evaluation.

Abstract: In this paper, it is assumed that diamond’s cross-section is hexagonal, which is similar to the actual condition. At first the diamond cutting depth of diamond drill bits and diamond saw blades has been calculated and analyzed. A variety of diamond size and diamond exposure difference has also been calculated and analyzed. It is shown that the cutting depth of single diamond was generally below 0.02mm and the difference on diamond exposure between coarse and fine diamond must be less than diamond cutting depth to achieve efficient rock breaking. Some diamond size design methods are acquired via the calculations and analysis.

Abstract: A command and control (C2) simulation system, ZZSIM is built. The characteristics of ZZSIM models are discussed, comparing System of Systems, HLA systems and complex systems. It is concluded that HLA based C2 simulation is valid. Then the communication data among C2 simulation nodes are recorded and analyzed, which shows that ZZSIM is scale-free. Therefore the data verify that ZZSIM is a valid simulation system of network centric war.

Abstract: The intermediate bands materials CuGa1-xQxS2 (Q = Ge, Sn) were investigated, and the narrow half-filled intermediate bands were successfully introduced into the chalcopyrite CuGaS2 when Ga3+ ion were partially replaced by Ge4+(Sn4+) impurities. The absorption edge of CuGa1-xQxS2 red shifts greatly with the increasing in the doping content due to the form of Ge-4s (Sn-5s) and S-3p hybridization orbits intermediate band, even small Q-doping content(2mol %), considerable red shifts are still achieved. CuGa1-xQxS2 (Q = Ge, Sn) with IBs extend the range of solar spectrum and could be the excellent candidates for the theoretical predictions of enhanced solar cell efficiency.

Abstract: The meniscus force between nanoobjects with a mediated liquid bridge plays an important role in many applications due to scale effects. As an typical configuration, the meniscus force between two spherical nanoparticles at various humidities is studied theoretically. The numerical method and the usual approximation method of calculating the meniscus force at various humidities are compared firstly. It is found that the big error may occur at some conditions. The effects of relative humidity on the meniscus force between spherical nanoparticles are investigated. Besides, the influences of spherical radius, the distance between nanoparticles, contact angles of the liquid on the meniscus forces between spherical nanoparticles are studied. The simulation results are helpful to understand and control the adhesion force at nanoscales.

Abstract: To understand the effects of the third body of copper in the copper-based composite materials on the friction properties, the effect of copper powders on the friction properties of Q235 steel is studied by using the pin-on-disk tester and adding copper powders third body. The results show that when the friction speed at 500-3000 r/min, due to the incremental copper powders, the depth of the furrows on the friction surface was reduced and the adhesion and spalling process of surface third body were intensified, which results that the frictional coefficients of the Q235 steel are increased 0.2-0.35 comparing with that of without adding copper powders. The reason is that incremental copper third body plays the role of increasing the meshing of the asperity and the actual friction area.

Abstract: In this paper a modified JPDA algorithm to avoid track coalescence is proposed. An exclusive measurement is defined for every target in the new algorithm, and with other targets will be pruned, which resists two or more targets share the same measurement as a key measurement and avoids track coalescence. The simulation results show that the new algorithm can effectively solve track coalescence problem in all kinds of scenarios, while keeping a high tracking performance.