最佳值

In general, this paper includes several parts, shown as the following: The first part summarizes the background and outline of stock index future and introduce briefly its local status and CSI 300 stock index future contract. The second part has a retrospect of the main academic papers of both local or overseas, and also a discussion of relevant hedge strategies and models, to lay a solid theoretical foundation for the empirical analysis and test for the operation process of hedge in latter parts. The third part outlines the principle, key factors and real operation process of hedge. Moreover, it makes a empirical analysis on popular hedge models with HK Hang Seng index. In the end, it test the hedge effect of trading on IF0706, CSI 300 stock index future contract, with CCB select-growth securities fund as present underlying. The fourth and also the last part, explores how to define hedge ratio in china mainland market. It includes the stability test ofβfor local securities portfolio, adjustment of historicalβand best data length for estimation of historicalβ, etc. Also, the thesis makes some beneficial experiments on the definition of best data length for estimation of historicalβ, survey of fashion forβand variation for industryβs. Fortunately, it's got some meaningful results.

按照以上研究思路，本论文论述由以下几个部分构成：第一部分，简要概述股指期货产生的背景和基本情况，对国内股指期货进程和沪深300股指期货合约进行简单介绍；第二部分，回顾海内外股指期货避险研究的主要文献，讨论相关避险策略及避险模型，为后面套期保值策略如何有效运用的实证分析和检验提供理论基础和依据；第三部分，对套期保值的原理、关键因素及实际流程进行概述，并采用香港恒生指数对常用的几种避险模型进行实证分析，最后一揽子以建信优选成长股票型基金为现货标的，实际检验以沪深300股指期货模拟交易IF0706产品进行对冲时的套期保值效果；第四部分，探讨国内确定避险比率的过程，包括国内股票组合β值的稳定性检验、历史β值的修正及估计历史β值的最佳数据长度等，通过数据分析，本文在寻找估计β值的最佳数据长度和考察风格、行业β值的差异上做了较为有益的尝试，并得到了有助于现实操作的结果。

The problem of multi-objective usually meet many conflict each other and can not use the objective of the same standard unit, then to employ membership function of fuzzy theory,at first each objective function to change fuzzy set and express with membership function, membership function include the maximum constraint, minimum constraint, the decrease function of monotonic property, to become optimal of the multi-objective function, but still to scanty of weighting value with regard to adjustment of objective function, thus this thesis proposes the method of combine orthogonal arrays and particle swarm optimization to solve the problem of multi-objective optimal power flow, each objective function separately add weighting value, to setting each weighting value of objective function in order to the result of anticipating.

多目标最佳化的问题通常会面临到许多互相冲突且不能用同ㄧ标准单位的目标，於是利用模糊理论中的归属函数，首先将各目标函数转换成模糊集合并以归属函数表示，归属函数包含了最大限制值、最小限制值、单调的递减函数所组成，将各目标函数利用归属函数表示，形成单一目标函数的最佳化，但是仍缺乏权重值对於目标函数的调整，於是本篇论文提出ㄧ种权重值设定与粒子群优演算法的方法去解决多目标最佳电力潮流的问题，将各目标函上分别加上权重值设定各目标函数的权重值，得到预期的效果。

By setting the retting duration of 20 hours, the factors affecting the residual gum percentage of the retted kenaf fibers are studied. The experimental results show clearly that the following factors have the significant influence on the residual gum percentage of the retted kenaf fibers and show the obvious variation tendency. The preferred processing parameters are as follows: pH value 7. 0、bath ratio 1: 50、reuse percentage of retting liquid 50%、air flow volume 2. 5L/min、temperature 40℃、nitric additives (ammonia is better than nitrates) percentage 0.45%.By comparison with anaerobic retting, the retting duration using aerobes is much shorter than that using anaerobes.

确定了以好氧微生物脱胶作为本课题的脱胶路线后，在特定的脱胶时间（20小时）条件下，通过分析不同参数条件下的残胶率，研究了好氧微生物脱胶的各种影响因素对红麻脱胶的影响规律，并优选出最佳脱胶液回用比为50％，最佳pH值为7.0，最佳气流量为2.5L/min，最佳浴比为1：50，最佳水浴温度为40℃，最佳含氮添加剂为铵盐类化合物，最佳含氮添加剂用量为0.45％。

The results from the experiment are: the amount of all micro-powders that grain sizes are less 0.044 mm should be less than 35% in weight, and the value of coarse q and attenuate q should be respectively 0.23 and 0.32, and the additive amount of active a-alumina and calcium alumina cement should be respectively 7% and 4% in weight, meanwhile, the best dispersant is PMAA-NH4 in the non-microsilica system; while the value of two q should be respectively 0.21 and 0.29, the amount of active a-alumina, microsilica and calcium alumina cement should be respectively 6%, 2% and 4% in weight, the best dispersants are sodium hexamer taphosphate and Na2P3Oio in the microsilica system.

依照上述实验方法得出刚玉自流浇注料所必备的条件：刚玉自流浇注料中的细粉(-0.044mm)总量应小于35％；在无硅微粉系统中的Andreassen公式的粗端q值和细端q值分别为0.23和0.32，氧化铝微粉、水泥的最佳加入量是7％、4％，且所使用的分散剂为改性聚丙烯酸钠最好，而在含硅微粉系统中的Andreassen公式的粗端q值和细端q值分别为0.21和0.29，氧化铝微粉、硅微粉和水泥的最佳加入量为6％、2％和4％，最好合用三聚磷酸钠和六偏磷酸钠作为分散剂。

The optimum conditions were as follows: 1 Fe3+/Fe2+ was 1.70-1.75;2 the precipitant,25% ammonia water was used 20%-30%,under 35℃,pH10-11 and with a stirrer speed of 3000 r/min for 1 h;3 in the first package process with gelatin and agar,the optimum amounts was 0.050-0.060g/150mL at the temperature of 55-60℃ and pH of 9-11;In the f...

最佳工艺条件为：(1)Fe3+/Fe2+之比在1.70~1.75；(2)沉淀剂25%NH3.H2O过量20%~30%，温度35℃，pH值11，反应时间为1h；(3)琼脂的最佳用量为0.050~0.060g/150mL；包覆的最佳温度为50~60℃，pH值为9~11；聚乙二醇作为第二次包裹剂时，最佳温度为55℃，反应时间是1h，pH值为4~5；并用透射电镜、分光光度计、古埃磁天平等进行了初步表征。

As a result of many assumptions which ignores saturation and flux leakage there were errors in the above method.

由于解析法采用了一些假设，忽略了饱和、漏磁等影响，所得到的磁极不对称角度不是最佳值。

By dint of someeffective and feasible methods, seek for more precise optimum point of systemdesign variates. And then the infections of precise optimization to system performance andcharacteristic rules were discussed.

即借助各种精细优化的有效途径和方法，寻求更加精准的系统设计变量的最优点和性能最佳值，得出精细优化后系统性能及特性变化规律。

No differences were observed between the two groups for RDW. AUC ROCs of MCV, RDW and erythrocyte fragility in the diagnosis of thalassemia were 0.877, 0.630 and 0.796, respectively. The cut-offs of MCV, RDW and erythrocyte fragility was 88 fL, 15.9%, and 37.5%, respectively. The sensitivity and specificity of MCV were 92% and 73.5%, respectively, 73% and 58% for RDW and 85% and 75% for erythrocyte fragility.

在诊断地贫时，MCV的ROC曲线下面积为 0.877，最佳临界值为88fL，该临界值的敏感度和特异度分别是92%和73.5%；红细胞脆性的AUCROC为0.796，最佳临界值为37.5%，该临界值的敏感度和特异度分别是85%和75%；RDW的AUCROC为0.630，最佳临界值为 15.9%，该临界值的敏感度和特异度分别是73%和58%。

It is proved that there is an optimal addition value for the DSSC application. When the content of PTC sol is 10% and refluxing time reaches to 9 h, the best photoelectric performance is obtained.

我们进一步研究了光电转换效率的影响因素，结果表明，溶胶的加入量和反应时间均有一最佳值，当基于PTC的TiO2溶胶添加量为10%，反应时间为9h，所得到电池的光电性能最好。

It is shown that its working frequency and linear growth rate are higher than thatof common Cerenkov FEL,and for the same injection current,the linear growth rate of thissvstem and common Cerenkov FEL either decrease with increase of the gap between the dielectricand electron beam or there is an optimum gap value corresponding tO the maximum growth rate.

发现在入射电流和波导结构一定时，该系统和普通切伦柯夫自由电子激光器的增长率并不是随随电子束与介质的间距的增加而减小，而是存在一个最佳值。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。