Historical War Crimes Trials in Asia

The book examines the historical trials from different perspectives, including the legal concepts used and debates that took place; the infl uence of the trials within a broader social context, both at their time and later; the collection of evidence; and preservation, compilation and research of historical documents. It not only analyses the trials in their historical and social contexts, but emphasises their present day signifi cance, also as regards the prevention of core international crimes, especially in Asia. The book offers insights on retaining and compiling historical materials concerning these trials as important historical records and new developments in evidence collection in contemporary international criminal courts

High step-up SVMC-based DC/DC converter for offshore wind farms

This study presents a high step-up scalable voltage multiple cell (SVMC)-based DC/DC converters, which have the features of high gain, low and adjustable components stresses and automatic input-current sharing in each input phase. In virtue of the above features, the converter is applicable for the DC collection grids for offshore wind farms. In this study, the converter in terms of working principle and property characteristics are analysed with four input phases and three SVMCs. The converter has also been evaluated in terms of the component stress and voltage conversion ratio against some other converters for high-power occasions. Moreover, a 2.5 MW simulation model and a 1.2 kW prototype were constructed for verification.</p

High frequency and high power density bipolar DC–DC converter with GaN HEMT

Bipolar DC–DC converter plays an important role in data center and distributed renewable energy unit with the advantages of high efficiency and low cost. In order to improve the power density of bipolar DC–DC converter, a high frequency and high power density bipolar DC–DC converter based on Gallium Nitride High Electron Mobility Transistor (GaN HEMT) is proposed under the development trend of miniaturization, lightweight and high power density of power electronic converter. By using gallium nitride (GaN) switch device, the switching frequency of the converter is increased to 1 MHz, which effectively reduces the volume and weight of the device. In addition, through the design of high frequency driver circuit, two separate pull-up/pull-down outputs are provided for the control signal, and the rising and falling rates of the switch signal are controlled by adjusting the resistance to obtain good performance and driving stability. The experimental results show that the total weight of the converter with radiator is only 121.6 g, the power density is 35.23 W/in3, and the maximum efficiency can reach 92.7%. Compared with the same type of converter, the volume and weight of the converter are greatly reduced, effectively realizing the goals of miniaturization, lightweight and high power density of the converter

Heterogeneous Network of Autonomous Vehicles

This project involves the design and implementation of a feedback control system to enable a quadrotor unmanned aerial vehicle (UAV) to detect and track the motion of a terrestrial wheeled mobile robot. The detection of the terrestrial robot is enabled by a camera carried onboard by the UAV, in conjunction with unique identification marks placed on the terrestrial robot. Raw camera data is processed by an algorithm developed using the open source software library OpenCV, which is executed a Raspberry Pi embedded computer carried onboard by the UAV. To correct errors in the vision-based measurement of the position of the terrestrial robot, a Kalman filter is developed, which is also to be executed by the Raspberry Pi computer. Preliminary test results are reported

Transport Performance Improvement of a Multiphase Pump for Gas–Liquid Mixture Based on the Orthogonal Test Method

To improve the transport performance of a rotodynamic multiphase pump for a gas–liquid mixture, we took the head and efficiency index at rated flow rate with 15% inlet gas volume fraction as the indices, and used the orthogonal test design method and CFD technology to optimize. We selected the blade shroud angles at the leading edge and trailing edge, and axial length of the impeller, as well as the inlet incidence angle and blade number of the diffuser, and a total of five factors were used for the orthogonal test. The weight function was used to determine the final trial protocol. The results showed that the blade shroud angle at the trailing edge had the greatest influence on the head and efficiency indices. Under the rated flow rate with a 15% inlet gas volume fraction, the head and efficiency of the optimized pump were increased by 2.81 m and 5.6%, respectively, in comparison to the base pump. After the optimization, the partial fast-speed regions at the inlet of the impeller passage and the partial low-pressure regions on the blade suction side of the impeller disappeared, the accumulation of the gas phase on the blade suction side at the impeller outlet was suppressed, and the pumping performance of the impeller using the gas–liquid mixture was improved greatly. This study provides an important theoretical basis for the optimization and design of a multiphase pump

A high-reliability SEPIC converter with reconfigurable voltage conversion gain

A high-reliability SEPIC converter with reconfigurable voltage conversion gain is proposed, which is composed of a basic SEPIC converter and n extended units. Adopting an interleaved parallel structure on the input side of the converter not only achieves leg-level hardware redundancy but also reduces the input current ripple. When one branch of the converter suddenly changes or fails, due to the redundancy between branches, the converter can still to work, and the duty cycle of the other branches can be readjusted by using PI control without changing output voltage and power of the converter. This feature undoubtedly presents the reliability of the converter. On the contrary, when the converter works in normal operation, it can also actively control operation mode of each branch to achieve reconfigurable voltage conversion gain function. In addition, since the duty cycles of the switches are not limited, voltage conversion gain of the converter is widely, which makes it more suitable for the occasions where the input side fluctuates greatly. Section 2 details the working principle of the proposed converter and the voltage and current stress on components. Then, the reconfigurable voltage conversion gain of the converter and its high reliability characteristics are analyzed in Section 3. Finally, the correctness of the theoretical analysis is verified by experiments

A Novel High Step-up Converter for Photovoltaic Systems

A bipolar high step-up Cuk-Sepic converters based on the 'coat circuit' is proposed, which can be used to connect single photovoltaic (PV) panel and inverters. The main advantage of the proposed converter is that it contains only one active switch as the same as the Cuk or Sepic converter, so it is easy to drive and control. The 'coat circuit' is introduced to increase the voltage gain of the converter and reduce the voltage stress of the devices. In addition, the proposed converter can output equalized bipolar voltage with common ground. This paper introduces the working principle and performance analysis of the proposed converter in detail. In order to verify the correctness and validity of the theoretical analysis, a 266.7W experimental prototype has been built.</p

A Lossless Auxiliary Circuit for Interleaved Boost Converters

This paper proposes a novel lossless auxiliary circuit for interleaved boost converter which provides zero voltage switching condition (ZVS) for switches at turn off instant, and the auxiliary circuit uses no magnetic components or active switches, so that high efficiency and high-power density can be achieved