DNA序列的3D图形表示（英文）

本文介绍一种新的DNA序列的三维图形表示，它可以避免相应空间图形的交叉和重叠。该图形表示的好处还在于，它仅仅有两种需要计算的可能情况，而在其它的三维表示中，往往有三种需要计算的情况。究其应用，我们对两种可能产生的表示情况，通过计算十二种不同物种间编码序列对应的L/L矩阵产生的正规特征值，构造一个2-维向量来检测上述物种间的相似性与非相似性。     

金属-介质复合体中的光学双稳

利用Maxwell—Gamett近似，结合谱表示和自洽平均场近似，从理论上研究了无规分布的旋转椭球金属颗粒浸在绝缘介质中而成的复合体在组分具有一般非线性时的光学双稳(OB)，讨论了two-OB现象及它们与金属颗粒退极因子和体积分数之间的关系，并给出了数值计算结果。     

论《宠儿》中复杂的历史观

《宠儿》体现了作者托尼.莫里森复杂的历史观。它一方面表现出后现代主义者对官方历史叙事的怀疑,另一方面又深信美国黑人保留深层文化记忆的重要性,而后者则是一个现代主义者的政治抱负。莫里森在这两个主义中找到了平衡,颠覆了美国黑人社会抗议所依附的现代主义的哲学基础和对元叙事以及历史和历时的时间观表示质疑的后现代主义之间的绝对对立。     

论艺术作品中具象与抽象意味的转换

具象与抽象是绘画的两种表现形式,具象中有抽象的存在,依托抽象提升再现具象的艺术性;抽象中有具象的基础,在再现具象的能力基础上升华出抽象意味。具象特征最强烈的写实绘画作品由于表现出非同凡响的对客观对象的意象感受,从自然中寻求最吸引人的形式元素,绘画本身有引导观者观看的信号;这时,写实具象作品就有了抽象的意味。最具抽象特征的表现性作品,往往由于摆脱内容的束缚,以形式的面貌走向自由王国,走向意念的深处,带给有共同经验的观者以心理上的真实和具象。所以抽象作品又有具象的意味。     

Being sloppy about slope: The effect of changing the scale

What is the slope of a(linear) function? Due to the ubiquitous use of mathematical software, this seemingly simple question is shown to lead to some subtle issues that are not usually addressed in the school curriculum. In particular, we present evidence that there exists much confusion regarding the connection between the algebraic and geometric aspects of slope, scale and angle. The confusion arises when some common but undeclared default assumptions, concerning the isomorphism between the algebraic and geometric systems, are undermined. The participants in the study were 11^th-grade students, prospective and in-service secondary mathematics teachers, mathematics educators and mathematicians — a total of 124 people. All participants responded to a simple but non-standard task, concerning the behavior of slope under a non-homogeneous change of scale. Analysis of the responses reveals two main approaches, which we have termed ‘analytic’ and ‘visual’, as well as some combinations of the two.     

Relationships among computational performance,pictorial representation,symbolic representation and number sense of sixth‐grade students in Taiwan

Twenty classes in ten schools with 627 sixth‐grade students in five cities in Taiwan participated in this study. The research provides information on the performance differences among written computation, pictorial representation, symbolic representation and number sense. The results of One‐way ANOVA analysis indicate that significant difference was found among WCT, PRT, SRT and NST tests, with F=536.327, p=0.000. The a posteriori comparisons show for each pair (WCT vs PRT, WCT vs SRT, WCT vs NST, PRT vs SRT and SRT vs NST) significant difference at the 0.001 level (p=0.000), except for the pair comparison between PRT and NST. This implies that these Taiwanese students were highly skilled in written computation but their written skills were not equally transferred to use of non‐computational paths that depended on symbolic representation, pictorial representation and number sense to solve similar problems.     

中华民族共同体意识的社会心理机制研究

本研究以社会心理学为研究视角,分别从社会表征理论和话语分析两个层面阐述中华民族共同体意识的社会心理机制。具体而言,在社会表征理论层面,中华民族共同体意识作为中华民族特有的社会表征,是在各族人民交往交流交融的历史条件下、以锚定和物化为两种基本的社会认知机制,具有社会共享性和行为差异性、社会根源性和行为说明性、相对稳定性和长期动态性等特征;在话语分析层面,从中华民族共同体的话语解构、话语转变和构建话语体系三个方面分析,明确"中华民族共同体"的概念,区分"中华民族"和"中华民族共同体"的使用情境差异,促进"中华民族共同体"概念的具象化,提出构建中华民族共同体意识的话语体系要兼顾政治话语、学术话语和大众话语的统一。从社会心理视角探寻中华民族共同体意识形成和发展的机制,有助于从"心"出发,进一步铸牢中华民族共同体意识,开创中华民族更加灿烂美好的未来。     

Multi-sensor image registration using multi-resolution shape analysis

INTRODUCTION Image registration plays an important role in the fusion of remote sensing, video panorama, medical image processing, etc. (Li et al., 1995; 2004; Brown, 1992; Belongie et al., 2001; Rui et al., 2001). More different than video panorama, the registration of multi-sensor image needs to align the multi-sensor images of the same scene from different sources (Rignot et al., 1991). Multi-sensor image registration is widely used in the fusion of panchromatic images with infrared i…     

我国货币政策的数量效应与运行效果

通过对我国货币政策的数量性效应进行简单分析．并使用Granger因果检验法和向量自回归模型对1984—2001年间货币供应量与物价、收入波动的关系进行考察后，研究发现我国货币政策的数量性效应总体是明显的。在长期内我国各经济主体对货币供给有较强的制约能力，货币供给受各经济主体的经济行为影响较大。这就导致中央银行对货币供给控制的难度加大，货币政策的效果可能被削弱。     

Automatically extracting sheet-metal features from solid model

With the development of modern industry,sheet-metal parts in mass production have been widely applied in mechanical,communication,electronics,and light industries in recent decades; but the advances in sheet-metal part design and manufacturing remain too slow compared with the increasing importance of sheet-metal parts in modern industry. This paper proposes a method for automatically extracting features from an arbitrary solid model of sheet-metal parts; whose characteristics are used for classification and graph-based representation of the sheet-metal features to extract the features embodied in a sheet-metal part. The extracting feature process can be divided for valid checking of the model geometry,feature matching,and feature relationship. Since the extracted features include abundant geometry and engineering information,they will be effective for downstream application such as feature rebuilding and stamping process planning.