CAI在体育舞蹈教学中应用效果的研究

采用调查法、文献法、实验法,以长春师范学院2003级学生为对象,对CAI在体育舞蹈教学中的应用进行了深入研究,旨在为体育舞蹈教学寻求一种更为有效合理的教学方法,提高体育舞蹈课的教学效果,以适应现代教学的发展,同时,也为共同体育课促进大学生身心健康提供一种思路。     

塔吉克族鹰舞在新疆全民健身运动中的价值研究

塔吉克族俗称“帕米尔之鹰”，是中亚地区最古老的土著民族之一，自公元10世纪以来，塔吉克人民就在海拔3000米的帕米尔高原上安家落户，已有两千多年的历史[1]。长期的劳动生活，特殊的地理位置以及自然环境，形成了塔吉克族独特的民族体育文化。鹰舞作为塔吉克族最富有浓郁民族气息的民间舞蹈于2006年5月20日被国家文化部批准成为首批国家级非物质文化遗产，具有极高的社会价值和教育价值，是中华民族传统体育的宝贵资源。这一传统体育活动已成为塔吉克族人民在节日活动、劳动之余必不可少的健身形式，是广大塔吉克族人民生活的重要组成部分，对生活在这里世代的塔吉克族人民有了相当深远的影响，特别是对这一民族舞蹈自小就耳濡目染的塔吉克族孩子更是发挥着深刻而又全面的教育功能。     

布袋除尘器光电检漏仪的研制

布袋除尘器检漏仪是根据“朗伯－比尔”定理设计的。它解决了国内除尘及环境实时检测和控制方面的问题。     

Multi-step nonlinear conjugate gradient methods for unconstrained minimization

Conjugate gradient methods are appealing for large scale nonlinear optimization problems, because they avoid the storage of matrices. Recently, seeking fast convergence of these methods, Dai and Liao (Appl. Math. Optim. 43:87–101, 2001) proposed a conjugate gradient method based on the secant condition of quasi-Newton methods, and later Yabe and Takano (Comput. Optim. Appl. 28:203–225, 2004) proposed another conjugate gradient method based on the modified secant condition. In this paper, we make use of a multi-step secant condition given by Ford and Moghrabi (Optim. Methods Softw. 2:357–370, 1993; J. Comput. Appl. Math. 50:305–323, 1994) and propose two new conjugate gradient methods based on this condition. The methods are shown to be globally convergent under certain assumptions. Numerical results are reported.     

Contractible subgraphs, Thomassen’s conjecture and the dominating cycle conjecture for snarks

We show that the conjectures by Matthews and Sumner (every 4-connected claw-free graph is Hamiltonian), by Thomassen (every 4-connected line graph is Hamiltonian) and by Fleischner (every cyclically 4-edge-connected cubic graph has either a 3-edge-coloring or a dominating cycle), which are known to be equivalent, are equivalent to the statement that every snark (i.e. a cyclically 4-edge-connected cubic graph of girth at least five that is not 3-edge-colorable) has a dominating cycle.We use a refinement of the contractibility technique which was introduced by Ryjá?ek and Schelp in 2003 as a common generalization and strengthening of the reduction techniques by Catlin and Veldman and of the closure concept introduced by Ryjá?ek in 1997.     

关于线图第二大根的极限点

设Gn为线图，λ2（Gn)为Gn的第二大根，给出λ2（Gn)的最小极限点：√5-1/2.这时，Gn≌Kr 1^1(Kr 1^1是由完全图Kr 1在其一顶点处与P2的连接图。     

Helly-Type Theorems for Line Transversals to Disjoint Unit Balls

We prove Helly-type theorems for line transversals to disjoint unit balls in ℝ ^d . In particular, we show that a family of n≥2d disjoint unit balls in ℝ ^d has a line transversal if, for some ordering ≺ of the balls, any subfamily of 2d balls admits a line transversal consistent with ≺. We also prove that a family of n≥4d−1 disjoint unit balls in ℝ ^d admits a line transversal if any subfamily of size 4d−1 admits a transversal. Andreas Holmsen was supported by the Research Council of Norway, prosjektnummer 166618/V30. Otfried Cheong and Xavier Goaoc acknowledge support from the French-Korean Science and Technology Amicable Relationships program (STAR).     

Embedded design based virtual instrument program for positron beam automation

Automation of positron beam experiment with a single chip embedded design using a programmable system on chip (PSoC) which provides easy interfacing of the high-voltage DC power supply is reported. Virtual Instrument (VI) control program written in Visual Basic 6.0 ensures the following functions (i) adjusting of sample high voltage by interacting with the programmed PSoC hardware, (ii) control of personal computer (PC) based multi channel analyzer (MCA) card for energy spectroscopy, (iii) analysis of the obtained spectrum to extract the relevant line shape parameters, (iv) plotting of relevant parameters and (v) saving the file in the appropriate format. The present study highlights the hardware features of the PSoC hardware module as well as the control of MCA and other units through programming in Visual Basic.     

精馏塔控制实质的探讨

本文从精馏操作原理出发,得出精馏塔控制的实质是在塔板结构与塔板数不变的条件下,改变操作条件,以使精馏塔在受到干扰后仍能维持原来的塔顶或塔底产品组成。应用这些基本关系,推导出操作变量的近似计算公式。这些关系式经过计算验证,误差在允许范围内,在控制中是可以应用的。