Perceptual learning of dot pattern

Dot pattern is a type of pattern defined by specific spatial relationship among some dots. As a compensation for concrete and meaningful visual stimuli, meaningless dot pattern can be used as stimuli in learning tasks. We performed an experiment for exploring the perceptual learning process of dot pattern against random-dot background. Participants were required to learn two types of dot patterns (9-dot and 11-dot). They were assigned to two groups: participants in Group 1 learned 9-dot pattern first and 11-dot pattern later, while those in Group 2 learned 11-dot pattern first and 9-dot pattern later. The results showed that participants could acquire the spatial relationship of dot pattern through perceptual learning in relatively short learning time. In comparison with 9-dot pattern, learning time of 11-dot pattern was slightly longer and its accuracy rate lower, but there was significant positive transfer effect from 11-dot pattern learning to 9-dot learning.     

常曲率空间中具有平行平均曲率向量子流形的不等式

设Mn是等距浸入在常曲率黎曼流形Nn p(c)中的n维紧致子流形,若Mn是极小的,有著名的Simons不等式.李安民等人改进了此不等式,现在进一步把它推广到常曲率黎曼流形的具有平行平均曲率的子流形的情形.     

社会主义市场经济条件下高校档案工作改革的思考

高校档案工作对高校的发展有着重要的促进作用，本文论述了如何在市场经济条件下，面向21世纪加强高校档案工作的几个问题.     

一个Markov转移概率函数的确定

利用柯尔莫哥洛夫向前方程计算了电话呼唤次数的随机过程的转移概率函数。     

完全体外化牛细胞核移植的研究

本研究探讨了用体外成熟卵母细胞和体外受精胚胎进行核移植的可能性。本研究结果在我国首次获得牛核移植的成功。从屠宰场回收的卵巢中抽取卵球－卵母细胞复合体，采用以前报道的方法（石德顺等，广西农业大学学报’１９９４：１３：１－５）进行体外成熟（ＩＶＭ）和体外受精（ＩＶＦ），获得ＩＶＭ卵母细胞和ＩＶＦ胚胎，体外成熟２３－２４ｈ后，在含０．１％透明质酸酶的无钙镁ＰＢＳ（ＰＢＳ）内，用细管反复吹打去掉卵丘细胞。选择具有明显第一极体的卵母细胞通过显微操作移去第一极体及其附近约一半的细胞质进行去核，去核的卵细胞在成熟液内继续培养到ＩＶＭ３０ｈ．体外发育到８－３２细胞期的ＩＶＦ胚胎用作核供体．供体胚胎用含０．２５％Ｐｒｏｎａｓｅ（溶于ＰＢＳ￣－）溶解透明带，并用细管吹打将其分散成单个卵裂球，在ＩＶＭ３０ｈ将单个卵裂球显微注入去核卵母细胞的卵周隙内，并在ＩＶＭ３１ｈ用８０Ｖ／ｍｍ４０μｓ两次电脉冲（间隔１秒）来诱导卵裂球与去核卵母细胞的融合。融合卵在颗粒细胞单层培养滴内共培养，体外培养２４ｈ后观察卵裂结果，经体外培养５－８天后发育到桑椹和囊胚的核移植胚胎移植到同期发情的受体．２个月后直检妊娠情况．本实验中共操作１９４枚卵母细胞，     

The Experimental and Theoretical Research of “Local Resonance“ in Ultrasonic Honing System

In 1982, Professor Fang Guoliang found the “Non full resonance“ phenomenon in a tool system while he use the thin-long tool ultrasonically machining deep-small hole. He called it as “local resonance“. Also this “Non full resonance“ phenomenon was discovered in the ultrasonic drilling and the ultrasonic honing system later. To its mechanism, professor Fang thought that the coupling of long-thin tool bar and driving system is weak, so the tool bar can vibrate independently, but the quantitative relation betwe...     

Delphi开发ASP文件上载组件

对ASP实现文件上载的原理进行分析 ,用高级编程工具Delphi开发ASP文件上载组件 .     

读取数据库的DBF文件通用算法分析

本文分析了ＤＢＦ文件的结构，讨论了真实记录和虚拟记录的关系，给出了记录长度和文件结构说明长度之间的数学表达式，按这种算法编写的程序具有通用性。     

附带各类约束的单一型装配线的平衡

本文着重描述了附带各种约束的单一型装配线的平衡问题,讨论了如何在Thomopoulos无约束平衡搜寻方法的基础上,实施附带各类约束的单一型装配线的平衡过程,并给出了在计算机上成功运行的实例及其分析。     

HP3562A动态信号分析仪的计算机控制

本文在分别简要介绍ＨＰ－ＩＢ接口、ＨＰ３５６２Ａ和ＨＰ９０００／３２０及其控制之后，较详细地讨论了ＨＰ－ＩＢ接口总线控制ＨＰ３５６２Ａ和进行数据传输的四种有效方法，并给出了程序实例。本文所述的方法同样适用于对其它ＨＰ－ＩＢ（ＧＰ＿ＩＢ）仪器的控制。