Components of phonological awareness

The factorial structure underlying different types of tasks within the domain of phonological awareness was examined in two studies. Large sample sizes allowed for sensitive differentiation of constructs. In the first study, 128 preschool children without any experience of formal reading instruction were tested with a battery of tasks intended to tap various aspects of phonological awareness: rhyme recognition, syllable counting, initial-phoneme matching, initial-phoneme deletion, phoneme blending, and phoneme counting. Three basic components were extracted in a principal component analysis: a phoneme factor, a syllable factor and a rhyme factor. Cross-tabulations indicated considerable dissociation between performance on phoneme, syllable, and rhyme tasks. The structural relationships were replicated on a much larger sample (n=1509) in the second study. Subjects in this study were one year older and were attending grade 1 thus providing an opportunity to test their reading achievement. Multiple regression analyses demonstrated that the phonemic factor was by far the most potent predictor. However, the rhyming factor made an independent (although small) contribution to explaining the reading variance. Among the phonemic tasks, phoneme identification proved to be the most powerful predictor.     

艾森斯坦判别法的推广

研究了艾森斯坦判别法的推广.将判别法中素数p所满足的条件放宽后,使艾森斯坦判别法成为其中的一个特例;对<数学通报>1992年第3期一文进行了进一步探讨,并得出新的结论;为判断整系数多项式在有理数域上不可约提供了新的方法.     

多项式代数的一类新的试验多项式

域上多项式代数K[X]中的一个多项式p称为试验多项式，如果代数K[X]的每个固定的p的自同态必为自同构。给出了一类新的试验多项式，可识别多项式代数的非线性自同构，对于域K的特征为奇素数，当d=4即h(y)为四次多项式时，给出了两定理的证明。     

高能多重产生中的关联积分与阶乘矩

高能碰撞多重产生中的动力学起伏激发了大批粒子物理学家的强烈兴趣．Bialas等人指出，系统的动力学起伏可以通过末态粒子阶乘矩随bin宽度变化的反常标度行为来反映，即hmFqoc（勿）－h，（1）其中y是末态粒子的快度，n是间联指数，Fo表示阶乘矩．如果定义多粒子快度分布为式中。；和…nc；分别为总非弹散射截面和半单举散射截面，则其中积分区域风是q维快度空间中以如为边长的q维小方盒．Carruther等人认为，为了反映所有粒子短程关联的情况，积分区域应该用“带形区域”代替M个万盒，称之为关联函数的StriP积分，取代（2）式的是民是带…     

哈密顿道路和Grbner基

通过应用多项式理想理论和Gr bner基方法 ,得出了判断简单图中是否存在哈密顿道路的一种新方法 ,该方法简单、易懂 ,且用数学软件Maple实施起来也非常容易     

A proof of maximum contention-free property of interleavers for Turbo codes using permutation polynomials over integer rings

INTRODUCTION In order to satisfy the high throughput and lowlatency requirements for next generation mobilecommunication systems, the parallelization of de-coding of Turbo codes (Berrou et al., 1993) has re-ceived remarkable attention. As the interleav-ing/deinterleaving operations may result in memorycontentions, interleaver design (Dinoi and Benedetto,2005; Dobkin et al., 2005; Popovski et al., 2004; Thulet al., 2002) is the bottleneck of the parallel Turbodecoder. For certain inter…     

一个至少三阶收敛的单步法公式

借助于函数y=f(z)的反函数x=ψ（y)的Hermite二次插值多项式和Steffensen加速法构造了一个单步法迭代公式，证明了它是至少三阶收敛．同时。通过数值实验。比较了它与牛顿法公式的收敛速度。证明了此公式的有效性．     

超球多项式的带权正交性及其应用

本文首先利用幂级数讨论超球多项式的性质并得到超球多项式的一般表这式,其次研究了超球多项式的带权正交性,最后给出超球多项式在Lapalace方程Dirichlet边值问题中的应用。     

关于初等对称多项式的几个不等式

本文给出了几个关于初等对称多项式的不等式。     

一类R(G)=-2图簇的补图的色性

研究不可约图的补图的色唯一性问题是图论的一个重要内容，该文在论证过程中利用图G的伴随多项式的最小根的性质及比较伴随多项式的末项。找到了一类n个点n l条边且R(G)：-2的图簇。其补图是色唯一的。主要结论是如下定理：设|V(A3(r1,r2))|=n(≥10)，其中r1≥3，r2≥5。若r2=5且A3(r1,r2)不可约，则A3(^→r1，r2)是色唯一的。即A3(^→r1，5)是色唯一的。