不偏

Based on works above all, the thesis compares results of positive analysis with what is going on in real markets, proceeds to verify the results of positive analysis, the thesis brings forward some advice in order to reform and perfect the China"s agricultural commodity futures markets.The first two chapters in this article investigates the unbiasedness hypothesis of futures prices in China"s agricultural commodity futures markets.

第二章详细介绍了协整技术和误差修正机制，利用该技术分析了距离最后交易日一月、二月、三月、四月、五月和六月期的大豆和小麦期货价格与现货价格之间的协整关系，发现四月期以内的大豆和二月期以内的小麦期货价格是对现货价格的无偏预测，而五月、六月期的大豆和三月期的小麦期货价格不是现货价格的无偏预测，四月、五月、六月期的小麦期货价格与相应的现货价格不存在协整关系。

As a result of error distribution\\\'s non-uniqueness, draws out to the standard deviation understanding again, by about standard deviation reflected that the erroneous zero rank value two side the variation targets, the application unimodal distribution fits the error distribution, the goal is: By approaches the rationality which under the enhancement goodness of fit\\\'s premise determines to the error.

从文章的上下文感觉此标准值似乎是人为规定的，并不受实测数据本身分布的影响，不具有客观性。个人认为：研究在实际中实测数据相对于均值的分布更有意义。按照作者的观点，误差的分布都是单峰的，除了正态分布这种对称分布外，作者认为还有不对称的偏峰分布。因此研究这种偏峰分布模型可能更有意义。

However, there have beensome problems exposed during past three years that can not be neglected, say highand unobvious gap of house prices, high investment ratio in house selling.

然而，不能忽视的是，珠海的房地产业在过去三年的快速发展中，也暴露了不少问题，如房价收入比偏高、阶梯房价不明显、投资性购房比例偏大等。

The many hybrid wheat combinations were bred by 4 male sterile types of alloplasmic wheat with Ae.kotschyi,Ae.variabilis,Ae.ventricosa and Ae.bicornis cytoplasms and some restoring lines,and their seed qualities were analysed.

利用具有粘果山羊草(Ae.kotschyi)、易变山羊草(Ae.variabilis)、偏凸山羊草(Ae.ventricosa)和二角山羊草(Ae.bicornis)异源细胞质小麦雄性不育系(以下简称粘、易、偏和二角型)组配成不同组合的杂种小麦，研究这4种不育系对杂种小麦籽粒品质的影响。

This paper analyses the characteristics of urban system in Anhui Province. It is found that this region exhibits a city-size distribution following the rank-size rule. The urban primacy index is low, the scale effect is inevident, the urban scale is small in whole, the development of metropolis and big cites is not enough, medium-sized cities is prominent and the spatial distribution of cities is not equal.

运用统计数据，在深入分析的基础上，发现安徽省现状城市体系的等级规模结构呈位序—规模分布；城市首位度偏低，规模效应不明显；城市规模总体偏小，特大城市和大城市发育不足，中等城市突出；城市规模空间分布不均衡，区域分异明显。

It is found that this region exhibits a city-size distribution following the rank-size rule. The urban primacy index is low, the scale effect is inevident, the urban scale is small in whole, the development of metropolis and big cites is not enough, medium-sized cities is prominent and the spatial distribution of cities is not equal.

运用统计数据，在深入分析的基础上，发现安徽省现状城市体系的等级规模结构呈位序－规模分布；城市首位度偏低，规模效应不明显；城市规模总体偏小，特大城市和大城市发育不足，中等城市突出；城市规模空间分布不均衡，区域分异明显。

Combined with investigation results of the furnace body erosion before relining, this paper analyzes the cause of production problems appeared in the first campaign life of the blast furnaces. Because of the existence of design shortcomings in large cooling block and bosh cooling stave, it resulted in poor furnace performance, such as stronger peripheral gas flow and irregular profile. The quick rise of bottom temperature of No.7 BF was caused by the penetration of molten iron into the joint of bottom carbon block, wheresas the quick rise of bottom temperature of No.6 BF was due to gas fleeing through the furnace bottom.

结合大修前炉体破损情况，对这两座高炉第一代炉役生产中出现的问题进行了调查研究。7号高炉大型模块和炉腰冷却壁设计上存在不足，引起高炉边缘气流发展，操作炉型不合理，炉况不顺；7号高炉炉底温度偏高是炉底炭砖渗铁造成的，6号高炉炉底温度偏高是炉底串煤气所致；7号高炉铁口失常的主要原因是铁口组合砖损坏严重和该部位炉壳开裂。

Partial color not serious can be selected automatically color balance "" option, automatic correction software; line which is going to be manually adjusted.

偏色不惨重时可以拔取&被迫色彩不均&选项，让软件被迫订正；偏色惨重时不离给举动手动调动。

We performed a simulative test, which confirms that wavelet analysis can separate annual wobble and Chandler wobble. Our results show that this method can be used in astronomical geodynamies effectively. This paper is divided into two parts. The first is about statistic characteristic of polar motion. Polar motion includes secular motion, long period fluctuations, Chandler wobble, annual wobble and high frequency wobble. The secular motion is 3.4mas/year and towards 760W meridian. Long period fluctuations have difference periods in x-axis and y-axis. They are 31.7-year and 24-year in x-axis and 28.5-year and 22.9-year in y-axis. These 2~? decades fluctuations have an amplitude of about 30 mas , and are very nearly linearly polarized, with the observed motion of pole being almost entirely along a line between 360E and 1440W. There is a 55.4-year wobble whose amplitude is 9 mas. The amplitude of the interannual fluctuations is about 4? mas. The amplitude of long period fluctuations decreased after 1970. The annual wobble is a steady wobble. It retrograde wobble is only 1/20 of prograde wobble in amplitude.

本文的工作主要分为两部分：第一部分是通过分析POLE97序列，我们对极移的统计特性有了一个较全面的认识，极移主要包括趋势项、长周期项、Chandler项、周年项和高频项：趋势项的方向是西经76°，速度为每年3.4mas；长周期项中Markowitz 项在X、Y两个方向有不同的周期，它们分别是：X方向的两个周期是31.7年和24 年，Y方向的两个周期为28.5年和22.9年它们叠加在一起是一个线偏振运动，最大振幅约为30mas，偏振方向在西经144°和东经36°之间；极移的长周期波动中还存在一个 55.4年周期的圆周运动，振幅约为9mas；十年尺度变化的振幅在4～6mas之间，在Y 方向十年尺度的成份比较多，它们的周期在X方向和Y方向不是对应的；从七十年代年开始长周期变化的振幅明显降低；周年项是一个振幅稳定的摆动，在X、Y两个方向的振幅略有差别，逆向运动振幅大约为顺向运动振幅的1/20；Chandler摆动的振幅自1900年以来经历了几次较大的变化，其中包括1915年和1955年两次极大值，振幅分别达到0&。25和0&。28，以及1925～1940期间小于0.09的过程，Chandler项在X、Y 两个方向的振幅几乎完全相等，其逆向运动振幅不到顺向运动振幅的1/50。

The results show that the hardness values of both outside wall and crosssection of the pipe are lower and not uniform,and the tensile strength and yield strength of the lower hardness location at room temperature and high temperature (545 ℃)are not in accord with ASME SA-335/SA-335M standard....

试验结果表明，所取管段的外壁硬度和横截面上的硬度值都偏低而且分布不均匀，硬度偏低位置的室温和高温(545℃)抗拉强度及屈服强度均不符合ASME SA-335/SA-335M标准。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。