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怎样求函数EXP~((q))的可接受有理逼近 总被引：2，自引：0，他引：2
杨逢建 《湘潭师范学院学报(社会科学版)》1990,(3)
本文首先得到了函数R_(?)~s(q)是函数exp(q)的各类可接受有理逼近的必要条件,其次证明了exp(q)的含有s+t-p~*个自由参数的不低于p~*阶的有理逼近存在,且对于参数的每一组给定值,逼近式唯一.接着就逼近阶P≧2s-2,s≧2情形给出了exp(q)的双参数有理逼近R_s~s(q_ib_(s-1),b_s)和三参数有理逼近R_(s+1)~s(q_ib_(s-1),b_s,b_(s+1))的系数计算公式,并由此得到了求exp的含有多个自由参数的有理逼近的一般方法. 相似文献
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Modern patent systems are slow, inefficient, expensive, and may result in outcomes that actively harm technological progress. This paper proposes a substantive re-think of these systems and lays a foundation upon which practical solutions can be built. Many solutions proposed in the past, such as prior-art bounties, outsourced examination, and dynamic fee setting, have gone unheeded due to the cost of administering them and the rigidity of the patent system. We explore how distributed ledger technologies (DLTs) enable these major changes by altering the way stakeholders are able to interact with the patent records system. We find that transitioning to a DLT-based patent records system can enable many previously suggested improvements to current patent systems in a flexible, scalable, and transparent manner. The case for such a transition is strengthened when jointly considering the complex but common roots of problems facing modern patent systems, rather than a balkanised set of technical solutions to address each issue independently. Noting that a DLT-based system is not a panacea, we also provide comment on the political, legal, and organisational challenges that must be overcome for such changes to be implemented at scale. 相似文献
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究竟是什么促成了合作——合作学习基本要素之比较 总被引：2，自引：0，他引：2
为了更好地揭示各种合作学习具体方式背后所包含的教育理念,保证合作学习的有效开展,有必要对合作学习的基本要素进行探讨.从合作学习三位代表人物所主张的基本要素来看,"建立互赖关系,聚焦小组目标;明确个体责任,确保人人参与;掌握社交技能,直面积极互动;鼓励公平参与,实现机会均等"是合作学习不同流派的共同内核. 相似文献
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许长谭 《临沂师范学院学报》2001,23(4):9-12
采用Holstein-Primakoff变换、相干态表示；含时微扰原理和多重标度方法，研究了Aharonov-Bohm(A-B)磁通对一维铁磁链中的磁隙孤子产生的影响，得到了在A－B磁通影响下的磁隙孤子的峰值、宽度、能量和自旋空间排列。 相似文献
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Özgecan Taştan Eylem Yalçınkaya Yezdan Boz 《Journal of Science Education and Technology》2008,17(5):444-453
The aim of this study is to compare the effectiveness of conceptual change text instruction (CCT) in the context of energy
in chemical reactions. The subjects of the study were 60, 10th grade students at a high school, who were in two different
classes and taught by the same teacher. One of the classes was randomly selected as the experimental group in which CCT instruction
was applied, and the other as the control group in which traditional teaching method was used. The data were obtained through
the use of Energy Concept Test (ECT), the Attitude Scale towards Chemistry (ASC) and Science Process Skill Test (SPST). In
order to find out the effect of the conceptual change text on students’ learning of energy concept, independent sample t-tests, ANCOVA (analysis of covariance) and ANOVA (analysis of variance) were used. Results revealed that there was a statistically
significant mean difference between the experimental and control group in terms of students’ ECT total mean scores; however,
there was no statistically significant difference between the experimental and control group in terms of students’ attitude
towards chemistry. These findings suggest that conceptual change text instruction enhances the understanding and achievement. 相似文献
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许长谭 《临沂师范学院学报》2000,22(6):16-17,54
应用三角晶场中d^2(d^8)电子组态的强场能量矩阵,采用完全对角化方法,精确地计算了具有D3d对称的Ni^2 :CsCdCl3的电子顺磁共振谱,理论值与实验值相符合。 相似文献
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Özgecan Taştan Kırık 《Research in Science Education》2013,43(6):2497-2515
This study explores the science teaching efficacy beliefs of pr-service elementary teachers and the relationship between efficacy beliefs and multiple factors such as antecedent factors (participation in extracurricular activities and number of science and science teaching methods courses taken), conceptual understanding, classroom management beliefs and science teaching attitudes. Science education majors (n?=?71) and elementary education majors (n?=?262) were compared with respect to these variables. Finally, the predictors of two constructs of science teaching efficacy beliefs, personal science teaching efficacy (PSTE) and science teaching outcome expectancy (STOE), were examined by multiple linear regression analysis. According to the results, participation in extracurricular activities has a significant but low correlation with science concept knowledge, science teaching attitudes, PSTE and STOE. In addition, there is a small but significant correlation between science concept knowledge and outcome expectancy, which leads the idea that preservice elementary teachers’ conceptual understanding in science contributes to their science teaching self-efficacy. This study reveals a moderate correlation between science teaching attitudes and STOE and a high correlation between science teaching attitudes and PSTE. Additionally, although the correlation coefficient is low, the number of methodology courses was found to be one of the correlates of science teaching attitudes. Furthermore, students of both majors generally had positive self-efficacy beliefs on both the STOE and PSTE. Specifically, science education majors had higher science teaching self-efficacy than elementary education majors. Regression results showed that science teaching attitude is the major factor in predicting both PSTE and STOE for both groups. 相似文献
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编制中学体育教材纲要的理论构思 总被引：1，自引：0，他引：1
张洪潭 《上海体育学院学报》1996,(2)
针对以往体育教材纲要编制中存在的问题,应用迁移理论中的广义相似原理,提出了编制体育教材纲要的理论构思。 相似文献
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“三个代表”是江泽民同志在世纪之交为加强党的的自身建设,提高党的领导和执政水平,对党的性质、任务、宗旨所作的新概括。它是马克思主义与时代特征和本国国情相结合的产物,其理论源头是《共产党宣言》。考察《共产党宣言》与“三个代表”之间的关系,有助于我们加理解和领会《共产党宣言》中所阐发的基本原理,有助于我们更好地学习和贯彻“三个代表”的精神实质。 相似文献