空间太阳望远镜中摆镜支架装夹变形的研究

空间太阳望远镜上的自适应光学摆镜要求具有高形面精度、高机械谐振频率,由于机械接口原因,只有通过连接支架才能装夹于摆镜平台。该支架结构直接影响摆镜的形面精度以及整个系统的机械谐振频率。运用接触非线性有限元技术,对四种不同结构的支架在螺栓装夹力作用下的变形进行详细计算,分析螺栓压力、螺栓压力差、重力以及螺栓垫片材料等因素对不同结构支架变形影响,为摆镜的装夹实验提供理论依据。     

方言在普通话教学中的借用方法及意义

试依据方言与共同语之间存在的共同因素及对应关系,探讨方言在普通话教学中的借用方法和意义,分析如何引导学生以自己的方言为桥梁高效率地进行普通话学习。     

沟通汉语与汉藏语之间的研究——首届中国语言及方言语言接触问题学术研讨会综述

语言接触是语言研究不可回避的重要课题,汉语研究必须注重与汉藏语研究的联系。文章从"语言之间的接触","方言之间、方言与少数民族语言、方言与外来语的接触","汉语与少数民族语言、少数民族语言之间的接触","历史层次分析"四个方面对首届中国语言及方言语言接触问题学术研讨会进行了综述。     

一种单列角接触球轴承的设计

角接触球轴承的设计涉及许多结构参数。着重介绍了角接触球轴承的钢球、内外套圈等零件主要参数的确定。基于用户要求,运用ZYB28-98角接触轴承的设计方法,首先确定了所需要的钢球直径和钢球数,并计算了其径向额定负荷。接着详细介绍了内外沟曲率半径、内外圈沟径、内外圈挡边直径等主要参数的计算过程。     

《史记》中所见的关中方言词语

《史记》中采用了大量方言,特别是关中方言词语。在前辈时哲的基础上摭拾“禳”、“刳”、“傭”等6个《史记》中所见的关中方言词语,从民俗等角度进行考释,并从共时平面分析关中方言对宁夏南部山区方言的影响,对《史记》词汇的研究和汉语方言的研究有一定的价值。     

湘南永州"清音不送气型"土话与桂北平话声母比较

从声母的角度将永州土话中的“清音不送气型”（道县江永型）土话与桂北平话进行比较，从中可以看到前者完全可以在后者中找到相应的类型，它们之间有着极其密切的联系。在讨论湘、粤、桂的土话、平话的归属问题时，完全可以将它们作为同一类型，同时也应该注意到它们之间的差异性。     

Initial Communication with and Attitudes toward International Students: Testing the Mediating Effects of Friendship Formation Variables

From the theoretical perspectives of intergroup contact, predicted outcome value (POV), and similarity-attraction, this study examined U.S. host nationals’ (N = 342) communicative behaviours in a recent initial encounter with an international student and attitudes toward the student’s cultural group as a whole. Testing of two models indicated the significant sequential mediator effects of perceived similarity-social attraction and POV-social attraction between communication variables (e.g. amount of communication exchange in both models, self-disclosure in model 1, and information seeking in model 2), and intergroup attitudes (e.g. behavioural attitudes). Findings in general demonstrated that contact effects in the intercultural context varied according to specific measures of communication, the mediating mechanisms, and intergroup attitudes.     

他砂汉语的标记被动式

他砂汉语的标记被动式有"名<,受>着+[名<,施>]+动""名<,受>+名<,施>+各+动""名<,受>着+名<,施>+各+动"等三种类型.讨论这三种标记被动式的用法及被动标志的来源.他砂汉语中由被动标记"各"和"着……各"构成的被动式均与土家语的影响有关,它们在形成过程中经历了土家语的抵抗和改造,属于汉语、土家语深度...     

Behind the Facade

Teachers have used many different techniques in efforts to augment engagement given the strong engagement-learning link. Teacher-student contact is one of the most effective tools for fostering engagement; however, some teachers find it hard to initiate contact in a way that seems natural. I present one method of initiating student-teacher contact: replying individually by e-mail to students' concerns raised in one-minute papers. I argue that, although this technique may require a greater time-commitment, the effort is worthwhile; it allows teachers to gauge and address students' misunderstandings effectively, and, at the same time, it can help teachers to establish contact with students in large classes or with quieter students and even help uncertain teachers to establish contact in a natural way.     

同异反可靠性系统中故障的分析

从系统工程可靠性出发,引入联系数的和、点积与积的概念以及相应的定理与性质,并利用联系数的点积对同异反可靠性系统中故障问题进行分析,从而探讨了系统工程中串联与并联的可靠度中故障问题的计算方法,解决了系统工程中有关串联与并联的可靠性的问题.