Prototype Experiments on a 1/32‐Scale Model Via‐Wheel Power Transfer Electric Vehicle

Electric vehicles (EVs) are expected to play a leading role in the changeover from fossil fuels to clean energy. However, EVs are currently not very popular, owing to their short cruising distance and long charging time. Wireless power transfer from the infrastructure to running EVs is expected to be the solution to these problems. Electric vehicle and electrified roadway (EVER) has been proposed as a wireless power transfer system for EVs while in motion. Via‐wheel power transfer (V‐WPT) is expected to be a wireless power transfer scheme for EVER. We designed and prototyped a 1:32 scale model of a V‐WPT system that consists of an RF inverter, an electrified roadway, a rectifier, and an EV with a dc motor. The output power of the prototype RF inverter was 5.9 W and the dc–RF conversion efficiency was 36.6%. The LC matching circuits for the V‐WPT were designed with two‐port conjugate matching because S₁₁ of the V‐WPT was intrinsically –0.06 dB. After matching, the S₁₁ value was reduced to –21.5 dB. The power transmission efficiency of the V‐WPT system was 75%. The RF–dc conversion efficiency of the rectifier was 62%. The total efficiency of the EVER system was 24.2%.     

木葡聚糖纯化鉴定研究

目的 木葡聚糖(XG)是豆类、蔬菜及水果重要的半纤维素成分, 本文探讨其纯化鉴定方法。方法 从乙烯催熟猕猴桃果肉提取半纤维素II(HC?II), 采用碘沉淀, 接着阴离子交换层析。结果 将XG含量从HC-II干粉中50摩尔%提高到纯化干粉中62摩尔%。纯化的XG中葡萄糖(Glc)︰木糖(Xyl)︰半乳糖(Gal)︰岩藻糖(Fuc)比例是10︰6.9︰2.1︰0.3。凝胶过滤层析表明, 纯化的XG平均分子量是161 kDa, 而聚合物总糖的平均分子量是95 kDa。结论 糖连接分析证实了猕猴桃XG缺乏岩藻糖(Fuc), 有少量的阿拉伯木聚糖、低分子量的葡萄甘露聚糖与XG密切结合。     

Pigment Changes in Parsley Leaves during Storage in Controlled or Ethylene Containing Atmosphere

Pigments were monitored in parsley leaves stored in air, air + 10 ppm C₂H₄, or 10% O₂+ 10% CO₂ controlled atmosphere (CA). Chlorophylls a and b, as determined with HPLC, decreased sharply in leaves held in air or air + 10 ppm C₂H₄. The decrease was less in leaves held in 10% O₂ and 10% CO₂ CA. The oxidized product of chlorophyll a, 10-hydroxychlorophyll a, did not accumulate and chlo-rophyllide accumulated minimally. Xanthophylls decreased but new pigments, suspected to be esterified xanthophylls, formed with yellowing of leaves. Neither the pathway of Chl degradation or xantho-phyll products were altered by C₂H₄ or CA.     

Verification of Characteristics of a Boost‐Type Matrix Converter for a Three‐Phase Four‐Wire System

This paper describes an improvement to the control method of a boost‐type matrix converter (MC) for a three‐phase four‐wire system. The system is intended for use in a stand‐alone power source with a constant voltage and frequency. However, the conventional method is not able to control the output voltage with a low power‐factor load. To resolve this problem, we propose a new control method by using a MC and revising the conventional control method.     

基于积分方程式的较粗圆筒天线的数值分析法

提出了基于表面电流有限间隙馈电Hallén型积分方程式分析较粗圆筒天线的数值方法.对于在脉冲展开点配矩量法的互阻抗表达式中遇到的特异点积分,介绍了一种数值结合解析法的处理方法,解决了特异点积分问题.该方法的主要优点是,在计算的简单性及节省计算时间方面要远远优于Galerkin法.实例天线输入阻抗的计算结果与其它方法的计算收敛值及测试值进行了比较.     

PERFORMANCE ANALYSIS OF TRAFFIC CONTROL METHODS ON MIXED TRAFFIC CLASSES IN ATM LAN

We treat traffic control methods for the multimedia ATM LAN, in which two service classes are considered; one is for high-speed data transfer based on a fast reservation protocol (FRP service class) and the other is for the continuous bit rate (CBR) traffic such as motion video (CBR service class). Through an analytic method, the performance of the CBR service class traffic is shown to be heavily affected by the FRP service class traffic. Thus, we introduce a reserved bandwidth for the CBR service class to guarantee some appropriate level of performance for the CBR service class. With the reserved bandwidth for CBR service class, the performance of CBR service class can be preserved from being affected by the FRP class traffic load.     

Robust control for a constantly rising temperature system (Hm control approach)

Thermoluminescence dating has attracted the attention of geology and archaeology researchers as a new method. This method requires a heating device to raise the temperature of the specimens at an exact rate. This paper describes the design method of a control system that can achieve this goal. This control system lends to be unstable because of the existence of the parameter perturbation and dead time. In this paper, the perturbation and dead time are treated as perturbations of a nominal plant regarded as a first-order lag time system. Improvement of tracking characteristics in the low-frequency domain and robust stability in the high-frequency domain of the control system are achieved by using the solution of the mixed-sensitivity problem that is a kind of H^∞ control theory. Experiments verify the effectiveness of this method.