From natural numbers to numbers and curves in nature —I

The interconnection between number theory, algebra, geometry and calculus is shown through Fibonacci sequence, golden section and logarithmic spiral. In this two-part article, we discuss how simple growth models based on these entities may be used to explain numbers and curves abundantly found in nature     

新课程标准下初三数学复习课教学探讨

随着新课程改革的纵深推进,中考中考察学生数学能力和联系学生实际情况的题目越来越多,传统的复习方法已经不能适应当下的数学中考.针对新教材,在复习中注重知识结构的建立,增强知识应用能力的培养,多采用变式训练,既能提高学生复习的兴趣,又能培养学生的探究能力和创新能力,往往能收到事半功倍的效果.     

电流变液阻尼器密封装置的设计

电流变液阻尼器的密封是阻尼器设计中的关键技术,该文利用在流体机械中的应用较多的螺旋密封,并对其作用原理和设计方法进行研究和论证;通过Matlab优化工具箱软件进行参数的最优化,从而得到一种对各种参数均进行优化的完整方案。     

对数螺旋齿轮精密加工工艺研究

针对对数螺旋齿轮精密成形工艺的特点,通过滚齿机、数控滚齿机范成精密加工方法,从而保证了精密加工要求,并运用专用工装设计的原理,介绍了几种对数螺旋齿轮精密加工的工艺措施,保证精密加工精度和任意螺旋角变化规律的要求．     

论网络媒体和传统媒体的角色差异——郭德刚事件舆论传播解读

郭德刚事件由公众人物与媒体之间的司法纠纷演变成一场有关公共道德和社会风气的大讨论.传统媒体在事件中大都持批评郭德刚的立场,网络舆论则经历了由"倒郭"到"挺郭"的转变,造成传统媒体和网民立场差异的根源是公众对传统媒体舆论监督的越位及公权力介入公共讨论的不满,以及网络舆论的"反沉默螺旋"效应.郭德刚事件凸显了权力与公众冲突时传统媒体与网络媒体的角色差异.     

论网络流行语的流行机制

以网络为主要特征的新媒体的出现,使受众之间的信息交流和传播方式被赋予了新的含义。交际方式和交际环境的日益更迭,随之形成了一种特殊的语言形式——网络语言。而受众的广泛使用,使得这些网络语言迅速走红,成为当下时尚的网络流行语。文章主要通过对网络流行语的概念界定以及对最近几年网络流行语的深度剖析,从新媒体作用、受众影响以及语境关联的推动三个方面,阐述了“沉默的螺旋”对网络流行语的形成所起到的重要作用。     

How opinion polls affect voting in Bangkok's gubernatorial election

In response to the widely publicized failure of most pollsters to predict the winner of the Bangkok governor election on 3 March 2013, this study examined the published results of opinion polls in the news media to see how they had affected the voter preference and what errors existed. The study analyzed a series of poll results by five major pollsters for the pre-election and exit polls during the governor election campaign from January to March 2013 and, then, compared them with the final results of governor election. The poll results lent partial support to the spiral of silence theory. Among all pollsters, only NIDA Poll projected the right prediction for Democrat candidate M. R. Sukhumbhand Paribatra as the winner. Its pre-election polls showed his final victory occurring in the last leg of the election campaign as a result of the late swing voters against the ruling Pheu Thai Party attaining monopoly on power. Suan Dusit and Abac Polls showed the existence of the bandwagon effect for Pheu Thai candidate Pol. Gen. Pongsapat Pongcharoen. Besides their polling effects, major factors accounting for errors included shy Democrat factor, late swing of voters, sampling error, and nonresponse bias.     

用迭代方式进行软件开发方法探讨

在螺旋模型理论下采用迭代开发是构建可重用软件的重要方法。通过一个实例的讨论,探讨迭代开发方法的过程与步骤,以及在各个步骤中应该得到的关键性的软件产品。     

国民党青年在台湾服贸话语权之争中的集体沉默浅析

《海峡两岸服务贸易协议》引发了台湾反服贸和挺服贸的话语权之争,对台有利的经济协定为何有理说不清引人深思。在宣传上,国民党政府的高层路线难敌反对派的草根动员;反服贸联盟散播错误信息,煽动恐惧和对立情绪使得国民党四处灭火。国民党的四个青年工作组织(国发院、青工会、青年团和青年军)在反服贸学运中表现被动,在沉默的螺旋和推理性动机的作用下,促使挺服贸派在学运前期的集体失语和反服贸派认同感的不断加强。     

Mathematical modeling and characteristics analysis for the nutation gear drive based on error parameters

We focused on the mathematical modeling and characteristics analysis for the nutation drive based on error parameters. The crown gear tooth profile equation was introduced according to the national standard double circular arc tooth profile and based on the equal tooth strength principle. The nutation drive meshing coordinate system was set up by introducing the cone vertex error, tilt error, nutation angle error and spiral angle error. The tooth profile equations of the double circular arc external and internal spiral bevel gears were further obtained based on the crown gear tooth profile equation concerning above mentioned error parameters. The influences of the nutation gear reducer tooth contact conditions were analyzed with the gear tilt error and axial misalignment error. Finally, the correctness of the theoretical analysis was verified by the contact spot test.