Papers by Keyword: RBS

Abstract: Ni₈₀Fe₂₀ thin films have been manufactured onto monocrystalline silicon substrates, utilizing a physical vapor evaporation technique under vacuum. The thickness of these Permalloy films fluctuates between 16 and 45 nm. The structure and morphology of the Permalloy film are studied as a function of the thickness of the deposited magnetic layer. Rutherford’s backscattering spectroscopy technique was used to quantify the samples. X-ray diffraction method has been used to examine the structure, and the atomic force microscope scrutinizes the surface topography and performs the film roughness. These techniques allowed to infer that all the films crystallize in the face-centered cubic structure and exhibit <111> preferred orientation. The size of the crystallites is directly proportional to the thickness of the magnetic layer. The films are under stress and the lattice parameter increases with thickness. The 45 nm thickest film exhibits the roughest topographic surface with root mean square roughness near 2.4 nm, while the 16 nm thinnest film exhibits the smoothest topographic surface, not exceeding 3 Å. These results, and others, will certainly contribute to a better understanding of the physical properties of Permalloy material, and improve their technological applications

Abstract: Zirconium based metal pretreatments have become widely used in recent years as a substitute for phosphate deposition on steel alloys and for chromate on aluminum alloys in industrial applications. The choice of a zirconium based intermediate layer follows from its ecologic sustainability − decreased water and energy consumption, vehicle weight reduction, and low byproduct generation during processing. Here we describe our investigations of a characterization method of converted metal oxide thin films deposited by a plasma method. The thin film composition was characterized by Rutherford Backscattering Spectroscopy (RBS) and Energy Dispersive Spectroscopy (EDS) before and after conversion by a zirconium-based pretreatment, revealing the formation of zirconia after treatment. The corrosion mechanism of the deposited metal oxide films was investigated using electrochemical analysis, confirming the susceptibility of the film to corrosion and the applicability of corrosion investigations. The results pointed to a better performance of the RBS in comparison to EDS.

Abstract: Concerning the problem that classical time synchronization algorithms applied to large-scale Wireless Sensor Network have low precision and high energy consumption, this paper proposes a time synchronization algorithm based on cluster-tree. The algorithm can decrease the synchronization hop count by constructing a spanning tree, and uses two-way SRS in inter-cluster and one-way ROS in intra-cluster to reduce the number of messages required for the network synchronization. The experimental results show that the algorithm can keep the network synchronization precision at a higher level and effectively reduce energy consumption of nodes compared with the RBS and TPSN.

Abstract: This paper based on the regenerative braking system, which developed in the '863' project, designed pressure control method for RBS system in the condition of active pressurization state and conduct Bench experiments. The results show that, under the condition of high frequency, through modulation frequency of the pulse signal and duty ratio method can coordinate the regenerative braking and hydraulic braking force, meet target pressure and the pressurization rate requirements of RBS.

Abstract: As the rapid growth of national economy and further development of city construction, the exploitation of high-rise buildings and underground buildings is augmenting gradually, and leading to more and more deep foundation excavation that embrace difficult design, complicated construction technology, vulnerability to circumstance and other complex characteristics. A lot of accidents happen to deep foundation excavation in China every year, which severely affected our daily life and brought great losses to the corporations. Therefore, it is necessary to carry out effective risk management on the deep foundation excavation based on on-site surveys. This paper ascertains the main risks by the way of RBS, and with the help of adjudication by the experts and AHP methods, calculates the weights and makes sequence, then determines different corresponding risks followed by strategies put forward, so as to lay foundation for risk management in the construction corporation to effectively reduce the risk possibility and losses.

Abstract: This paper puts forward 3 new coordination control states based on the analysis of the control logic of pure hydraulic ABS during braking .In order to reduce the regenerative brake force, we make the logic conversion according to the present coordination control method and the hydraulic brake force can compensate the regenerative brake force. The simulation results show that the 3 states proposed in this paper combine the present coordination control method and optimize the coordination control of the regenerative brake force and the hydraulic brake force under the anti-lock braking condition.

Abstract: For Electric Vehicle (EV), energy saving and endurance mileage prolonging are very important. Regenerative Braking System (RBS) is a key point in this respect. At the same time, braking safety is a rigid demand of EV. In this respect, the Anti-lock Braking System (ABS) has an excellent performance. As a result, the integration of RBS and ABS plays an important role in the development of the EV control. In this paper, a dynamic adaptive threshold theory decides when RBS should exist will be studied, and when the states of vehicle reach the adaptive threshold, a sliding mode control method will be used to meet the total braking force and the system will reduce the motor braking force. Before slip rate of vehicle reaches the ABS threshold, the regenerative braking force will be reduced to 0. The braking safety will be improved in this way.

Abstract: Time synchronization is important for wireless sensor networks. In this paper RBS time synchronization algorithm principle and EECH routing protocol are introduced, and the simulation of RBS on the basis of EECH routing protocol is realized using the Synsinc software. The average synchronization error of the simulation is 25.86 us.This value is basically same with other types of simulation, which confirmed the simulation is credible.

Abstract: Structural disorder and lattice recovery of high dose, manganese implanted, semi-insulating, 4H-SiC have been studied by secondary ion mass spectrometry, Rutherford backscattering in channeling directions, visible-to-near infrared optical spectroscopy as well as with transmission electron microscopy. After heat treatment at 1400 and 1600 °C, a substantial rearrangement of manganese is observed in the implanted region. However, the crystal has not been fully recovered. More disorder remains in the [11 3] compared to the [0001] channel direction. Stacking faults, voids and 3C inclusions are observed in the implanted region. A Mn containing phase has most likely formed.

Abstract: Based on the investment risk characteristics of large-scale hydropower project, the risk identification of investment for hydropower project is investigated according to the project Work Breakdown Structure(WBS) and Risk Breakdown Structure(RBS). The method for estimating the investment risk of hydropower project is applying Monte Carlo simulation technique. This method is applied to analyze the risk of the Hsin-an River hydropower project in the Zhejiang Province based on experts' experiences. Good result is attained.