Advanced Materials Research Vols. 457-458

Abstract: To design a truss structure of deployable truss antenna with 7 modules and ensure that the truss structure can be deployed successfully in space environment, kinematics equation of single module with homogeneous coordinate transformation method is built based on the structure and deployment principle of truss structure. By using dynamics software ADAMS, simulation analysis on the deployment is carried out and the driving force of single module is obtained in the ground condition. On this basis, driving spring is designed, and all the important design parameters are obtained. The analytical results show that the driving spring can meet the requirement of deployment in the ground condition. So it can be deployed in orbit (0G). This method can be taken as the theoretical basis for the design and deployment experiment of truss structure.

Abstract: In order to improve management level of mining materials, optimum loading scheme is important. Based on the analysis of bulk cargo loading problem, taking carrying capacity and effective volume as constraint conditions, maximizing transport benefits as target, mathematical model on the base of optimization method is established. And genetic algorithm is introduced to case study. The result shows that genetic algorithm in solving the optimum loading scheme of mining materials has quick convergence, short term, and higher precision. The better satisfactory answer can be obtained after 100 generations. Before 600 generations optimum loading scheme can be educed. Genetic algorithm, with good adaptability and powerful search performance, is very suitable for optimization calculation of multiple constraints problem. Genetic algorithm can make full use of carrying capacity and volume in the process of bulk cargo loading transport, that promot mining enterprise’s operation efficiency. The study is useful for management work of mining material warehousing, scheduling, transportation etc.

Abstract: Anticipatory Reasoning-Reacting System (ARRS) proposed by Cheng is a new reacting system with more ratability and security compared with traditional reacting systems. Cheng also proposed the logic basis of ARRS with three-dimensional moving objects, i.e. 3D-STSRL. In this paper, we focus on the research on the logic basis of ARRS in the domain of air traffic control. In order to express knowledge and belief concisely and precisely, epistemic operators are necessary. This paper described the addition of epistemic operators into 3D-STSRL together with the foundation of 3D-STERL. Then a study case about air traffic control is shown for the application of 3D-STERL.

Abstract: The new-type networking and intelligent safety bed aiming at quakeproof and anti-violence is studied and designed. This Safety Bed includes the high precision seismograph, the pneumatic system, the Double-wing-typed Closed Mechanism, controlling system and so on. It can protect user from the danger from the earthquake and violence. The networking control system designed can interface with the Internet which combines the manufacturer-user service system with the Safety Bed in the world to offer the service online. The correlation technique can be applied in the seismic monitoring at home and hotel, in the home intelligent early-warning, in the intelligent anti-violence, and so on.

Abstract: Salt-alkali-related soil degradation is a worldwide environmental problem that attracts researchers’ continuous attention for many years. In order to reclaim saline soil, slat leaching which is considered as the most direct method is always used. Models used to describe soil water and salt dynamics which are essential for establishing salt leaching theory are always absolutely necessary. In this paper, two-dimensional water flow and salt transport models were developed for researching salt transportation during leaching in a soil domain above a silo drilled throughout the clay subsoil. The corresponding boundary conditions were established and models were solved by finite difference method. Based on the experiment carried out in northwest China, the calibration and validation were realized and the result showed that the general trend of the simulated soil salt contents after leaching matched better with the observed values. The models could successfully simulate salt distribution of such leaching process and provided a reasonably good link for salt transportation research in saline-alkali soil.

Abstract: This article described a novel type of autonomous underwater vehicle and modeled the dynamics. This kind of vehicle looked like an air-plane with large wings and worked under the condition of negative buoyancy. The motions of negative-buoyancy-vehicle (NBV) in the longitudinal plane were analyzed through linear system theory. This paper divided motion of NBV into a few modes in the longitudinal plane and provided a method of reduction of order to simplify the analysis, as well as gave the criterion of static stability under constant load in longitudinal plane. It had been found that the maneuverability and stability of NBV was related to many factors such as the velocity, lift-drag ratio, buoyancy and metacentric height. All of the conclusions could be applied on NBV design.

Abstract: For a determination of the system’s efficiency and decrease the cost, a low cost system for measuring solar irradiance is designed. By analyzing the influence of solar irradiance and temperature to solar cell, we have found that in case of different temperatures the variation of short-circuit current (Isc) in function of solar irradiation incident (E) is always linear. Then the read-out circuitry is designed to measure and convert the signal which is detected by the photoelectric cell and thermocouples. At last, the software is developed to compensate the temperature and make sure the device work normally. The results of detecting the system show that it’s effective and reliable.

Abstract: Scaling-ro-translation symmetry is grouped by rotation-translation symmetry and scaling symmetry. As rotation-translation symmetry, scaling-ro-translation symmetry is widely exists in mechanical product structure and plays an important role. Referring the concept system of rotation-translation symmetry, and according to the combination types of symmetry benchmark and the variable types of scaling, the concept system of scaling-ro-translation symmetry was established. The concept system includes same benchmark and different benchmark scaling-ro-translation symmetry, component size, rotation alternations, translation alternations and complex scaling-ro-translation symmetry, and can offer theoretic foundation for further research.

Abstract: This paper investigated on the optimization design of the AlGaN/GaN High electron mobility transistors (HEMT) with gate terminal field-plate (FPs) structure and proposed an optimization method at a given work conditions, such as drain bias Vd . Though the simulation, we obtain two fitting formula about the FPs thickness tox and the minimum length lmin.

Abstract: Combining the mechanism of the hash chain with the forward-secure proxy blind signature, we firstly propose a new strong forward-secure proxy blind signature scheme. This scheme has many secure characters, such as strong forward security, namely, although the attacker get the key in some period , the attacker cannot forge the signature in the past and future periods, verifiability, unforgeability, distinguishability, identifiability, strong blindness.