共查询到20条相似文献，搜索用时 546 毫秒
1.
2.
3.
4.
首先给出了欧氏空间的等积变换的定义.其次给出4个引理并利用这些引理给出了有限维欧氏空间的两个线性变换为等积变换的充要条件,其中一个充要条件反应了两个等积变换在规范正交基下的矩阵关系,另一个充要条件反应了两个等积变换之间的关系.最后给出了无限维欧氏空间为等积变换的一个充要条件及等积变换的一个性质. 相似文献
5.
本利用丢番图方程获得了判别素数的充要条件,从而获得了默森尼数和费尔马数为素数的充要条件。 相似文献
6.
林育青 《韩山师范学院学报》1997,18(2):27-29
本文给出了3＿线图含有奇洞的充要条件，从而使3＿线图的完美图猜想得到彻底解决，同时，本文还给出完美3＿线圈是k点染色的充要条件及3＿线图是连通的充要条件等一些结论。 相似文献
7.
8.
文[1]给出了椭圆上存在轴对称点的充要条件及其应用,本文把这个充要条件称为:定理1椭圆22E:ax2 by2=1(a、b>0)上存在关于直线l:y=kx t对称的相异两点的充要条件是k=t=0或k≠0且(a2?b2)k>t a2 b2k2.无独有偶,《数学通报》2007(3)P31给出了抛物线上存在轴对称点的充要条件及其应用,本文把这个充要条件称为:定理2抛物线E:y2=2px(p>0)上存在关于直线l:y=kx t对称的相异两点的充要条件是k=t=0或k≠0且pk4 2pk2 2t k<0.定理1.2分别给出了椭圆、抛物线上存在轴对称点的充要条件,我们自然要问:双曲线上存在轴对称点的充要条件是什么呢?为此本文探… 相似文献
9.
10.
11.
12.
目前仍然有相当一部分刑法学者坚持认为:“接受国家审查和裁判“是自首成立的一个独立条件.本文从该条件的历史演进与逻辑解释的两个角度,论证修订后的刑法及司法解释规定的“二条件说“已经蕴涵了原司法解释的“三条件说“.“接受国家审查和裁判“的条件在实践中已经失去了独立存在的社会条件,在思维中亦缺乏严密的逻辑基础.继续坚持自首成立的“三条件说“,不仅会导致理论的荒谬,而且会影响司法实践的质量. 相似文献
13.
计算出了二能级系统在非绝热近似情形下的演化波函数,同时计算出了系统在演化一周期后的几何相位。对比绝热近似时的情形,给出一种二能级系统的绝热近似条件。 相似文献
14.
Alain Quiamzade 《European Journal of Psychology of Education - EJPE》2007,22(3):243-258
This study (N=75) examined the influence dynamics that take place between two competent individuals presenting divergent solutions
for a cognitive task. The hypothesis was that such settings (i.e., conflict of competencies) are unlikely to have a positive
effect on intellectual performance because of the representation of the task, and that an increase in performance may be found
if such a representation is modified. Three conditions were examined: a control condition in which participants completed
the task by themselves, a conflict of competencies condition in which participants declared to be highly competent where confronted
with a equally highly competent (bogus) partner who offered diverging solutions (standard conflict of competencies condition),
and a conflict of competencies condition in which a decentring procedure was induced to modify the representation of the task.
The results showed that participants in the decentring condition solved the task better compared to the standard conflict
of competencies condition and the control condition. However, the results unexpectedly revealed imitation in the two conflict
of competencies conditions compared to the control condition. Complementary analyses suggest that in the standard conflict
of competencies condition imitation corresponds to a defensive motivation. 相似文献
15.
从教材和师资两方面入手分析了综合科学课程改革的现状,并且对改善这种现状做了些探讨。 相似文献
16.
17.
Elisabeth M. Spratto Brian C. Leventhal Deborah L. Bandalos 《Educational and psychological measurement》2021,81(1):39
In this study, we examined the results and interpretations produced from two different IRTree models—one using paths consisting of only dichotomous decisions, and one using paths consisting of both dichotomous and polytomous decisions. We used data from two versions of an impulsivity measure. In the first version, all the response options had labels; in the second version, only the endpoints were labeled. Based on past research, we hypothesized that the endpoints would be selected more frequently in the endpoint-only labeled condition, and the midpoint response option would be selected more frequently in the fully labeled condition. Results from the two models (dichotomous and polytomous) were similar and indicated that our hypotheses were partially supported—specifically, there was no consistent pattern in terms of which condition saw a higher frequency of midpoint response selection. However, our hypotheses regarding extreme responding in the endpoint-only labeling condition were supported. 相似文献
18.
胡鹏 《中国教育技术装备》2011,(18)
研究活性炭的两种典型的表面修饰方式;考察氧化条件的改变对活性炭中羧基量的影响;分别考察硝化过程中还原时锌的用量、氧化条件以及活性炭与卟啉金属盐连接反应时的温度条件对产品的催化活性的影响. 相似文献
19.
林丽玉 《宁德师专学报(自然科学版)》2002,14(1):6-7,12
著名的孙子定理在模两两互质的条件下 ,给出了同余式组的公共解的表达式 .现就模不两两互质的条件下 ,探讨同余式组的公共解的表达式 ,并利用线性代数的方法给出了具体的求解方法 相似文献
20.
Gary L. Cates 《Psychology in the schools》2005,42(6):637-646
This study investigated the functional relationship between student accurate response levels and two mathematics drill procedures using a BCBC across participant's single case research design (in this case, “B” represents peer drill and “C” represents computer drill). Each of four elementary school students was randomly assigned to one of two dyads and presented addition flashcards under a computerized drill condition and a peer‐mediated drill condition. In both conditions, students were drilled for 3 minutes on addition facts with immediate feedback (i.e., “Correct” or “Not correct”). Results suggested that the two somewhat older students showed higher levels of accurate responding in the computer condition, while the two younger students showed higher levels of accurate responding in the peer‐tutoring condition. Discussion focuses on potential hypotheses for performance discrepancies across dyads, importance of matching instructional conditions with idiosyncratic variables, and implications for practice and future research. © 2005 Wiley Periodicals, Inc. Psychol Schs 42: 637–646, 2005. 相似文献