等价电子组态nlN光谱项的推求法

从等价电子组态的"自旋因式化"出发,导出了nsN～nhN组态的Lα、Lβ取值规则,给出了推求等价电子组态光谱项的简易方法.     

Is the PhyloCode better than Linnaean system?—— New development and debate on biologi-cal nomenclatural issues

The Linnaean system provides ultimate means governing biological nomenclature and classification.With series of modification,this system has admirably served biological sciences for some 250 years.The new PhyloCode,however,advocates the phylogenetic nomenclature that radically alternates the current nomenclatureal rules.The new proposals upset many systematic biologists and have provoked hot debate on nomenclatural issues.Binomial nomenclature and hierarchical classification are the key components of the Linnaean system.Proposed abandonment of these in the PhyloCode is widely criticized for it would not help to promote systematics but create chaos.It is not the Linnaean system but the phylogenetic nomenclature that should be abandoned.     

医学微生物学某些术语的汉译名称之商榷

医学微生物学存在一些科技术语的汉译名称不统一。文章就沙门氏菌属、耶尔森氏菌属、埃希氏菌属、志贺氏菌属、奈瑟氏菌属、布鲁氏菌属、克雷伯氏菌属、立克次氏体属、芽孢杆菌属、枝原体属等菌属名称,肥达氏试验、革兰氏染色、革兰氏阳性菌、细菌芽孢、非典型性肺炎和SARS、“病原生物学”等微生物学术语,进行了研讨和提议。     

The use of monthly indicators to forecast quarterly GDP in the short run: an application to the G7 countries

The delayed release of the National Account data for GDP is an impediment to the early understanding of the economic situation. In the short run, this information gap may be at least partially eliminated by bridge models (BM) which exploit the information content of timely updated monthly indicators. In this paper we examine the forecasting ability of BM for GDP growth in the G7 countries and compare their performance to that of univariate and multivariate statistical benchmark models. We run four alternative one‐quarter‐ahead forecasting experiments to assess BM performance in situations as close as possible to the actual forecasting activity. BM are estimated for GDP both for single countries (USA, Japan, Germany, France, UK, Italy and Canada), and area‐wide (G7, European Union, and Euro area). BM forecasting ability is always superior to that of benchmark models, provided that at least some monthly indicator data are available over the forecasting horizon. Copyright © 2007 John Wiley & Sons, Ltd.     

THE λ-GROBNER BASES UNDER POLYNOMIAL COMPOSITION

Polynomial composition is the operation of replacing variables in a polynomial with other polynomials. λ-Grgbner basis is an especial Grobner basis. The main problem in the paper is： when does composition commute with λ-Grobner basis computation？ We shall answer better the above question. This has a natural application in the computation of λ-Grobner bases.     

对基于变动量项前馈神经网络盲源分离算法的研究

介绍了盲源分离及基于神经网络盲源分离算法的原理,阐述了基于变动量项前馈神经网络盲源分离算法,并进行了计算机仿真实验。     

磁场中弱电离气体二维平板超音速边界层扰动演化研究

数值模拟了6种不同外加磁场下M∞=4．5、弱电离的二维平板边界层的基本流场及边界层中第二模态不稳定波的非线性演化。发现：外加磁场使边界层附近同—γ处的流向速度减小从而使边界层的厚度增加；很大程度地改变法向速度；壁面摩擦系数减小；很大程度地抑制第二模态不稳定波的增长。这些影响主要决定于外加磁场的强度，而对外加磁场的产生方式不很敏感。外加磁场的存在还使得压力产生波动，在边界层内，压力波峰的位置与流向磁场力绝对值极大的位置基本一致；在边界层外，压力波峰的位置滞后于流向磁场力绝对值极大的位置，并且离边界层越远，这种滞后就越明显。     

具有吸收项和局部源的一维p-拉普拉斯方程解的熄灭

利用Lp模估计和Sobolev嵌入不等式,研究了一维情形下p-拉普拉斯方程解的熄灭,并给出解在有限时刻熄灭的充分条件及衰退估计.     

Noether整环上不同项序下的复合Groebner基

复合是指将多项式的每一个变元用新的多项式替换.对于Noether整环上的多项式环上某个项序下的Groeb-ner基,利用S-多项式及合冲条件,证明了当复合是另一项序下的一组首幂积为幂置换的首1多项式时,Groebner基的计算与复合可以交换.     

方程与曲线论〔10〕——等分方程定理(C1型)

对任意正整数ｎ，运用等分方程定理（Ｃ１型），就可产生一个一元（ｎ＋１）次代数方程式，并具备配套求根公式。