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Bioassays are required for the integrated evaluation of water pollution, as physical and chemical tests alone are not sufficient enough for the assessment of potential effects on aquatic organisms. ... In this study, invertebrate crustacean Artemia salina was applied as a indicator to assess the water quality of Hangzhou Section of Beijing-Hangzhou Grand Canal. According to the result, improvement in water quality was observed between October 2008 and April 2009. It proved A. salina was sensitive in detecting toxicity in water quality. več

目的大麦籽粒是一类重要的谷物原料,在啤酒酿造、禽畜喂饲、药食保健等领域的用途十分广泛.研究表明,籽粒中的淀粉颗粒大小及淀粉组成结构决定其用途.通过研究不同品种大麦不同粒径淀粉颗粒的组成结构及物化性质,为大麦淀粉加工利用提供参考.方法以西引2号(Xiyin-2)、京辛1号(Jingxin-1)、苏啤6号(Supi-6)3种不同用途的大麦品种籽粒为原料,采用沉降分离法得到大、中、小3个粒径的淀粉颗粒,研究颗粒显微形态、淀粉晶体结构、直链淀粉含量、支链淀粉侧链分布以及淀粉颗粒热特性、水合性质、糊化特性和消化特性与粒径的关系.结果大颗粒大麦淀粉多呈盘状,中颗粒淀粉呈扁圆形或椭球形,小颗粒淀粉呈球形或多角形.在偏振光显微镜下,所有大麦淀粉颗粒具有典型的偏光十字,且偏振光亮斑随粒径增加而增强.大麦淀粉的大颗粒占比最高(87.62％-89.48％),其次为中颗粒(8.97％-9.42％)和小颗粒(1.55％-3.29％).大麦淀粉的表观直链淀粉含量为19.12-30.63 g/100 g,粒径对其含量的影响缺乏规律性.所有样品均为A型结晶,相对结晶度随着粒径增大而增加.大麦支链淀粉的侧链分布呈现双峰模式,主峰在DP 12处,次峰在DP38处,大麦支链淀粉以B,链含量最高(34.34％-44.76％),其次是A链(25.12％-34.52％),大麦支链淀粉的平均链长为DP 22.86-25.00.热特性分析结果表明,小颗粒大麦淀粉的糊化温度区间(△T)最大,糊化焓(△H)则随着粒径增加而增大.大麦淀粉的膨胀力表现出品种差异,京辛1号大麦淀粉所有粒径颗粒均具有较高的膨胀力.糊化特性分析结果表明,大颗粒淀粉的峰值黏度、崩解值、终值黏度比中颗粒和小颗粒淀粉更高.消化特性分析结果表明,大麦淀粉颗粒快消化淀粉(RDS)含量随着粒径减小而增加,而粒径对其慢消化淀粉(SDS)和抗性淀粉(RS)含量的影响缺乏规律.结论粒径对大麦淀粉的直链淀粉含量.支链淀粉精细结构、相对结晶度等结构特征有较大影响,从而影响大麦淀粉的热特性、糊化特性及消化特性等性能.

In this paper, we constructed a three-dimensional dynamic simulator for HitMSR II which is a module self-reconfigurable robot system composed of single-rotational-freedom modules. Downhill Simplex ... Optimization Algorithm were used to evolve the locomotion of the robot ensuring that it is possible to get access to the relatively more optimized locomotion gaits parameters after large enough numbers of iterative calculations under a certain evaluation function. What’s more. We selected worm-shaped configuration to research on the validation of locomotive evolution both in simulation and experiment. več

An advanced static VAr generator (ASVG) can be beneficial to power systems in many ways. In order to evaluate its dynamic performance, the device should be modeled appropriately in transient studies. ... This paper describes the dynamic behavior of ASVG in balanced systems and unbalanced systems. When bus voltage becomes unbalanced due to asymmetrical power systems failure or symmetrical operation, the negative sequence voltage component will cause negative sequence and 3-order harmonic voltage on the AC side of the ASVG. A model is presented for the transient stability studies in unbalanced systems. več

碩士 國立高雄應用科技大學 電機工程系博碩士班 96 In this thesis a parallel energy transformation circuit is implemented by a combination of a boost-flyback converter and a forward converter. The boost-flyback converter is ... with direct power conversion and power factor correction, and the forward converter can regulate the output voltage. Therefore, the power factor and the efficiency of the whole converter system can be effectively improved. Besides, a digital signal processor (DSP) is used to implement the functions of voltage-follower control, soft-starting, and overvoltage protection. The simulation and test of the circuit prototype were performed, and the results satisfy the requirements of high power factor and efficiency. več