关于整系数多项式的一个结果

用简洁的方法，证明了如下结果：若整系数多项式f(x)=x^n a1x^n-1 a2x^n-2 …＋an-1x an的所有根的绝对值都不大于1，an≠0，则f(x)的根都是单位根。     

Maximizing modern distribution of complex anatomical spatial information: 3D reconstruction and rapid prototype production of anatomical corrosion casts of human specimens

Anatomical corrosion casts of human specimens are useful teaching aids. However, their use is limited due to ethical dilemmas associated with their production, their lack of perfect reproducibility, and their consumption of original specimens in the process of casting. In this study, new approaches with modern distribution of complex anatomical spatial information were explored to overcome these limitations through the digitalization of anatomical casts of human specimens through three‐dimensional (3D) reconstruction, rapid prototype production, and Web‐based 3D atlas construction. The corrosion cast of a lung, along with its associated arteries, veins, trachea, and bronchial tree was CT‐scanned, and the data was then processed by Mimics software. Data from the lung casts were then reconstructed into 3D models using a hybrid method, utilizing both “image threshold” and “region growing.” The fine structures of the bronchial tree, arterial, and venous network of the lung were clearly displayed and demonstrated their distinct relationships. The multiple divisions of bronchi and bronchopulmonary segments were identified. The 3D models were then uploaded into a rapid prototype 3D printer to physically duplicate the cast. The physically duplicated model of the lung was rescanned by CT and reconstructed to detect its production accuracy. Gross observation and accuracy detection were used to evaluate the duplication and few differences were found. Finally, Virtual Reality Modeling Language (VRML) was used to edit the 3D casting models to construct a Web‐based 3D atlas accessible through Internet Explorer with 3D display and annotation functions. Anat Sci Educ. © 2012 American Association of Anatomists.     

A case study of using an online community of practice for teachers’ professional development at a secondary school in China

In this case study, an online community was designed at a secondary school in China for the teachers to prepare their lessons collectively, reflect on their teaching practices, collect comments from peers, and share resources. A survey was administered to the teachers to investigate their perceptions on the online community for their professional development. Two hundred and eighty-three teachers responded to the survey and eight teachers were further interviewed by email. The result showed that most teachers liked using the online community as they could gain subject knowledge and could obtain support from peers, share experiences and get feedback, and exchange resources. Also, online entries confirmed that transformational changes in teaching pedagogy and students’ learning activities occurred along the time. However, certain teachers did not participate in the online community frequently. This paper describes the context of the case study, design dimensions of the online community, teachers’ positive perceptions on using the online community, and transformational changes. Also, strategies for promoting effective use of the online community are discussed and follow-up studies to address the challenges involved in this study are proposed.     

《庄子》形容词兼语句的句型及结构模式

《庄子》形容词兼语句共有36句,分为五种句型,其最基本的句型结构模式是：S＋PV1＋OS＋PA2。其余的各种句型可以看作是它的变体。此外,兼语句有时还和连谓结构组成多重复杂的谓语句,其结构模式有两种：S＋PV1＋（OS）＋PA1＋“而”＋（Adv＋）PA2／PV2PV（＋O）;S＋PA1＋O＋PV2＋（OS）＋Adv＋PV2＋O。     

蔬菜大棚智能环境参数测控系统的研究

构建了一种蔬菜大棚智能环境参数测控系统。该系统采用分布式结构,CAN总线通讯方式。系统通过实时检测温室环境温度、湿度、光照度和C02浓度以及土壤湿度,与预设的参数指标进行比较,如果超出范围,自动打开控制系统,控制电灯、风机、喷水器、加热器、降温泵等进行操作,使蔬菜生长环境实现自动控制．上位机软件采用VB语言编写,可实现数据的存储、显示、控制参数设置、数据查询和打印等功能。     

唐代女子体育的盛况及其原因探析

女子体育是唐代体育文化的重要组成部分,它不但在中国古代体育史上熠熠生辉,在世界古代体育史上也独树一帜。分析唐代女子体育发展的盛况及原因可知,其发展是唐代社会进步和女子地位改善的产物。这一研究为当今女子体育以及社会体育的发展提供参考。     

中古汉语程度副词初探

中古汉语程度副词有单音词和复音词之分。它们既有继承上古汉语而来的程度副词,又有不少中古时期新兴的成员。继承而来的程度副词和新兴成员在构词方式、使用特点上呈现出不同的特征。此外,本文还对中古汉语程度副词的发展特点进行了探讨。     

当前素质教育中若干问题的思考

我国当前素质教育实践中存在轰轰烈烈素质教育和扎扎实实的应试教育的矛盾、自然科学和人文社会科学教育、知识教育和道德教育相脱离的矛盾、素质教育与社会环境不配套等一系列矛盾。素质教育是一个社会性的系统工程,需要全社会各方的关心和参与才能正确开展。解决这些矛盾需要教育理论创新、制度和政策创新与人事制度改革等一系列的创新和改革。     

《易经》学案

河图洛书是中国传说中的产物,而甲骨卜辞和《易经》则是中国远古时代占卜的记录。由于《易经》的影响,中国的巫术、图谶等流传不绝,这种偶然性的推测却以为是必然性的认识,自然是不合逻辑的,致使杨振宁得出中国从《易经》以来就没有推演法的结论,并进一步指出这是中国没有产生近代科学的重要原因之一。     

中日土地征收立法比较研究

通过比较研究,我们发现中日两国土地征收无论在宪法还是在法律中均存在一定的差异,也反映了我国土地征收立法的缺陷。我国应借鉴日本的先进经验,完善土地征收立法。