摘要：The major program of Chinese Academy of Social Sciences completed in 2012, entitled “The Research on Myths and Legends about Chinese Civilization Source”, led to such a conclusion: The imaginative myths and legends generated along with the Chinese civilization has a profound prehistoric root, far beyond the limit of the Chinese character generation period. The main path of Chinese myths and legends lies in the jade mythology and resulting jade belief. When viewing the origin of jade from a perspective of mythology, we find each major jade (e.g., jade ring, jade arc) form is covertly driven by a mythological concept. The investigation of the era and regional distribution of unearthed jade wares may outline the spreading path map of the jade mythology and belief.

摘要：This paper presents the effect of the high voltage direct current (HVDC) transmission system based on voltage source converter (VSC) on the sub synchronous resonance (SSR) and low frequency oscillations (LFO) in power system. Also, a novel adaptive neural controller based on neural identifier is proposed for the HVDC which is capable of damping out LFO and sub synchronous oscillations (SSO). For comparison purposes, results of system based damping neural controller are compared with a lead-lag controller based on quantum particle swarm optimization (QPSO). It is shown that implementing adaptive damping controller not only improves the stability of power system but also can overcome drawbacks of conventional compensators with fixed parameters. In order to determine the most effective input of HVDC system to apply supplementary controller signal, analysis based on singular value decomposition is performed. To evaluate the performance of the proposed controller, transient simulations of detailed nonlinear system are considered.

摘要：In this paper, a new miniaturized wide-pass-band filter at U band based on composite right/left- handed transmission line (CRLH TL) is implemented. The CRLH TL contributed to a broadband filter is a balanced structure with a small size of only 1.428 mm*0.5530 mm. The frequency characteristics are simulated and the results show that the 3 dB band width of the proposed filter is about 13.5 GHz from 45.8 GHz to 59.3 GHz. The insertion loss is quite flat through the pass-band and the return loss is relatively low.

摘要：We propose a novel resonator that can reduce magnetic field leakage using a ferrite plate. The proposed resonator consists of a rectangular loop, a ferrite plate, and an L-matching network. The ferrite plate is used as an H-field reflector to direct more H-field to each resonator, and the L-matching network is employed to match the 50 Ω of the feed cable at 13.56 MHz. Two identical resonators with dimensions of 30 cm × 15 cm are separated by 50 cm, and the resulting transmission efficiency is about ?12.3 dB at 13.56 MHz. This is about 4.2 dB higher than the resonators without the ferrite plate.

摘要：Optimal design is one of the most important issues in robots. Since the very beginning, the concepts of the Jacobian matrix, manipulability and condition number, which are used successfully in the field of serial robots, have been applied to parallel robots. Unlike serial robots, parallel robots are good for motion/force transmission. Their performance evaluation and design should be correspondingly dif- ferent. This paper is an attempt to optimally design a novel spatial three-degree-of-freedom (3-DOF) parallel robot by using the concept of motion/force transmission. Accordingly, three indices are defined. The suggested indices are independent of any coordinate frame and could be applied to the analysis and design of a parallel robot whose singularities can be identified wholly by using the relative angle between the output and adjacent links, and by using the relative angle between the input and adjacent links.

摘要：研究直流电压下绝缘子表面电荷积聚问题对于推进直流气体绝缘金属封闭输电线路(gas insulated metal-enclosed transmission line,GIL)的发展至关重要。现有试验研究中均未考虑温度对电荷积聚的影响,难以获得用于实际工程中的直流GIL绝缘子电荷积聚情况。而仿真计算仅从理论上分析了温度对电荷积聚的影响规律,尚缺乏有效的实验验证。为了解决上述问题,该文设计了可模拟直流GIL导杆发热现象的绝缘子表面电位测量试验平台,并设计了同轴圆柱结构试验模型。研制了紧凑型静电位测量系统对不同温度下绝缘子的表面电位进行了测量,掌握了直流GIL导杆温度对绝缘子电荷积聚特性的影响。试验结果表明:当中心电极温度由室温升高至70℃时,在正极性电压作用下,绝缘子平均表面电位由278V增大至1670V(501%);在负极性电压作用下,绝缘子平均表面电位为负,绝对值由460V增大至1507V(228%)。因此,在进行绝缘优化设计时,需要考虑温度的影响,该研究可为直流GIL绝缘优化设计提供参考。

摘要：Ginger is a potential agricultural commodity to be developed in India. When the harvest comes, people still use a very simple method for harvesting ginger by using hoes, pick-axe and other farming equipments. The farmers complain for the need of so many work forces for harvesting while the labor cost is getting increased and the time spent for harvesting process is too long. Although there is an alternative of imported ginger harvesting machines, those machines are not compatible with the farming environment in India, having a high initial and maintenance cost. This machine can be used in any farming condition in India and can be prepared at village level. This machine has three main parts namely, ginger digger, screener and power transmission system. This project is focusing on design and fabrication ginger harvesting machine. The screener will not only separate ginger from soil but also not let the ginger get harmed. The screener also uses for collectible part, to make this machine need some power transmission system from the engine. This machine needs Auto front petrol engine with rotation speed 20 - 25 rpm approximately with the aid of gear reduction.

摘要：智能配电网除传统的树状拓扑结构外,还将出现环网、格状网等结构。建立具有这些特殊拓扑配电网的电力线信道模型,并进行信道特性影响因素的分析是在智能配电网中应用电力线载波通信技术的必要前提和重要依据。通过基于信息节点的建模方法建立格状网拓扑的信道模型,并仿真分析前后主干长度、格网主干长度、分支长度、分支负载等因素对格网拓扑下信道传输特性的影响规律,重点分析了这些影响因素对信号衰减的影响。通过实验验证了所得结果的正确性和有效性。所提出的分析方法和所得结论为设计智能配电网电力线载波通信的调制方法提供了必要的理论基础和技术手段。

摘要：In this paper we propose an optimal design of ultra-wideband (4 ~ 20 GHz) microwave absorbers consisting of two resistive meta-surface layers of different square patch arrays. Gradient Descent and Genetic Algorithm numerical methods are employed to optimize all the parameters through equivalent transmission line circuit model. The circuit parameters are then implemented by a multilayer including two resistive meta-surfaces of square patch structures. Two types of such absorbing structures, with the total thicknesses close to that of the known theoretical limit, are designed and their performance are verified by full wave electromagnetic simulation.

摘要：This paper develops a prototype to demonstrate a full-duplex wireless visible light communication (VLC) system based on Universal Serial Bus (USB) port. Combing with a USB 2.0 port on one board, it can achieve up to 2 Mbps bit rates error free, which is mainly limited to the USB bridge circuit, between two computers for data transmission, such as text, audio and video. Hyper Terminal and self-written software are used to allow setting the transmission data rate, control bits, check bits and achieve real-time transmission between any two mobile devices with a USB port. The work is based on the research of VLC local access network. This paper also shows the experimental results and the relationship between system transmission eye diagram and bit rate.