和指数

The unified discrete iterative map model of peak current and valley current controlled buck, boost, and buck-boost converters is established, and the unified piecewise smooth iterative map and their corresponding characteristics equations are also derived.

本文建立了峰值电流和谷值电流控制Buck，Boost，及Buck-Boost变换器的统一离散迭代映射模型，并导出了统一的分段光滑迭代映射方程及特征值方程，通过数值仿真得到了占空比变化时的正、逆分岔图和Lyapunov指数谱。

The main contents and results are included as following:The main influence factors on thrust adjusting character of pintle motor were sumarized. The influence of burning rate exponent and throat diameter on thrust was analysed and the relationship between pressure and thrust ratio of pintle motor was obtained.

本文研究内容及主要成果如下：(1)从理论上分析了喉栓变推力发动机推力调节特性的主要影响因素，揭示了推进剂压力指数和喷管喉部面积变化对推力调节特性的影响规律，给出了压力调节比和推力调节比之间的转变关系。

We also investigated the stomatal indices and carbon isotope composition of fossil angiosperm leaves, and then calculated paleo-CO_2 level and phytophysiological parameters in Pliocene.

根据被子植物叶片的气孔指数和碳同位素组成对古大气CO_2浓度和植物古生理参数进行了定量重建。

It is found that the information entropy and exponent of power spectrum are two powerful indexes to distinguish the atmospheric turbulence in boundary layer and the explanation for difference ...

结果表明，信息熵和功率谱指数是区别稳定层结和不稳定层结大气边界层湍流特征的指标，对造成两者之间的差别做出了对应的解释。

Based on the physical concept of heat energy of preignition, a new fire susceptibility index is used to estimate the forest fire risk .

结合遥感和气象数据，基于可燃物引燃能量的物理概念，利用火灾敏感性指数进行森林火险监测和评估。

Results］ In the one-way analysis, the risk factors of breast cancer are history of benign breast diseases, high body mass index, early age at menarche, family history of carcinoma, late age at primiparity, high frequency of abortion, a large age at last parturition, and swell or pain in breast during menstruating.

结果］ 单因素分析，达到统计学显著性水平的危险因素有乳腺良性疾病史、BMI指数高、初潮年龄早、肿瘤家族史、初产年龄大、流产次数多、未产年龄大和行经时乳房涨痛。哺乳和饮用井水是保护因素。

Results］ In the one-way analysis, the risk factors of breastcancer are history of benign breast diseases, high body mass index, early age at menarche,family history of carcinoma, late age at primiparity, high frequency of abortion, a largeage at last parturition, and swell or pain in breast during menstruating.

结果］单因素分析，达到统计学显著性水平的危险因素有乳腺良性疾病史、BMI指数高、初潮年龄早、肿瘤家族史、初产年龄大、流产次数多、未产年龄大和行经时乳房涨痛。哺乳和饮用井水是保护因素。

Using the estimates of character sums over Galois rings and the trace de scription of primitive sequences over Zpe, we obtain an estimate for the frequency of the occurrences of any element in Zpe in one period of a primitive sequence, which is better than Kuzmin's results[1] if n ＞ 4e, where n is the degree of the generating polynomial of the primitive sequence.

范淑琴 ，韩文报文研究了Zpe上本原序列的元素分布。利用Ga，lois环上的指数和估计和本原序列的迹表示，得到了Zpe中各元素在本原序列的一个周期中出现频率的一个估计。当n＞4e时(n为本原序列生成多项式的次数)。我们的估计优于Kuzmin的结果[1]。

With probability sampling and home interview survey data of Shanghai and Chengdu, we use factor analysis to build the structure of romantic Index Scale.

以上海和成都概率抽样和入户面访的调查资料为依据，采用因子分析方法构建浪漫指数的结构量表。

Along with the rapid development of Internet technology and exponential progressional increase of network resource, the tempo of search engine decides the using rate of Internet resource to a large extent, and the problems in existing search engines make the academia ceaselessly do some research in every kind of search theory and technique.

随着互联网的高速发展和网络资源的指数级数增长，搜索引擎的发展水平在一定程度上决定着互联网资源的利用率，但现有搜索引擎存在的问题，促使学术界不断进行各种搜索理论和技术的研究。P2P全文搜索引擎作为一种全新的搜索方式，日益受到学术界的关注，各种改进的搜索算法被相继提出，并应用于实践。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。