An Interesting Answer

Mary has been going to primary school for a week.At the end of the first week,ber father asked her,“Whieh period you like best at school？”     

An Easy Ridiculous Unbiased Estimator

The principle of unbiased estimation is very attractive to students of introductory statistics courses. Unfortunately, there exist problems in which all unbiased estimators will sometimes provide ridiculous estimates of the parameter of interest. In this paper we present an excellent example of this shortcoming.     

对“李约瑟问题“的一个解答

中国没有产生近代科学的直接原因是科学理性精神的缺失,深层原因是封建专制政治统治的干预.因为封建统治者认为,科技的发达必然带来伦理的丧失,而伦理的丧失必将危机国家和社会的稳定,因此封建统治者不仅"不需要"科技,而且还反对科技的发展.     

杂文创作答客问

本文对杂文的本质、特点、创作规律、当前杂文创作的困惑和杂文作家的苦衷,以及杂文创作的出路与对策都作了回答.     

一种简便的单目CCD摄像机标定方法

对数学形态学中腐蚀和膨胀原理进行研究,提出针对常用的对称十字二维平面标定板图像的特征点提取算法.结合改进的Tasi两步法,选取经典的带一阶径向畸变的小孔摄像机模型,对MV-1300UC数字CCD摄像机进行标定.实验结果表明,该方法能够达到较高标定精度,平均标定误差为0.025 3 mm,且计算效率高,易于实现.     

光栅常数测量中常易忽略的一个问题

本文讨论光栅常数测量中,平行光不垂直入射光栅时如何对测量值的影响及如何调节平行光垂直入射光栅.     

2004全国大学生数学建模赛C题解法与评述

给出了C题一种解法,将生化过程、生活常识和采用微分方程并应用数学软件建立起来的数学模型较好地结合．对此解法及相关方法作了评述．     

Why School is not Easy: An Analytical Perspective

An overarching theory that enables a systematic study of learning recently has been developed. Motivation, for example, is something we all think we know when we see. It was an important step to recognize that motivation can be conceptualized in terms of allocating working memory and especially attention to a learning task. The unified learning model (ULM) was synthesized from the literature with this in mind. Using the ULM as a basis for analysis, it is possible to consider all aspects of learning. A good place to begin concerns schools in general and why, in particular, school is not thought of as being easy. The ULM explains that allocating working memory often requires effort, and any exertion of such effort may be perceived as being hard. This paper is an analysis of school learning and especially science learning (STEM learning) in terms of the ULM.     

教育问与答

如何纠正孩子的发音? Q我的孩子4岁4个月,说话时发音不怎么准,有些字词说不清楚。如:f的音她会发成b的音,g的音会发成d的音,还有一些卷舌、平舌的都发不大准。有什么快速、方便的办法来纠正吗?     

Einstein''''s Answer

One day when Einstein was 1(?) his way home, a young man stopped him and wished 2(?) a word with him. Einstein granted his request. The young man asked, "How, Mr Einstein, can you 3(?) your fame? " The scientist said, "It seems that you have been thinking of 4(?) famous every day." The young man nodded.     

教育问与答

又换看护人了Q女儿2岁了,从4个月起白天就由奶奶或姥姥来照看,一般半年替换一次。姥姥前两天刚过来,女儿变得特别黏我,而且本来大小便已经很规律了,现在又开始频繁尿裤及尿床。这种两边交替的看护方式会对她造成不良影响吗?在这种看护方式下,我应该做些什么帮助她适应?     

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Easy Style

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