浅谈标识的设计与方法

标识是有抽象性的、具象性的和非图案的字体标识,是视觉形象的核心,它构成了企业形象的基本特征,体现了企业的内在素质.标识不仅是调动所有视觉要素的主导力量,也是整合所有视觉要素的中心,更是社会大众认同企业品牌的代表.因此,标识设计在整个视觉识别系统设计中具有重要的意义.     

Different responses of two Mosla species to potassium limitation in relation to acid rain deposition

The increasingly serious problem of acid rain is leading to increased potassium (K) loss from soils, and in our field investigation, we found that even congenerically relative Mosla species show different tolerance to K-deficiency. A hydroponic study was conducted on the growth of two Mosla species and their morphological, physiological and stoichiometric traits in response to limited (0.35 mmol K/L), normal (3.25 mmol K/L) and excessive (6.50 mmol K/L) K concentrations. Mosla hangchowensis is an endangered plant, whereas Mosla dianthera a widespread weed. In the case of M. hangchowensis, in comparison with normal K concentration, K-limitation induced a significant reduction in net photosynthetic rate (P _n), soluble protein content, and superoxide dismutase (SOD) activity, but an increase in malondialdehyde (MDA) concentration. However, leaf mass ratio (LMR) and root mass ratio (RMR) were changed little by K-limitation. In contrast, for M. dianthera, K-limitation had little effect on P _n, soluble protein content, SOD activity, and MDA concentration, but increased LMR and RMR. Critical values of N (nitrogen):K and K:P (phosphorus) ratios in the shoots indicated that limitation in acquiring K occurred under K-limited conditions for M. hangchowensis but not for M. dianthera. We found that low K content in natural habitats was a restrictive factor in the growth and distribution of M. hangchowensis, and soil K-deficiency caused by acid rain worsened the situation of M. hangchowensis, while M. dianthera could well acclimate to the increasing K-deficiency. We suggest that controlling the acid rain and applying K fertilizers may be an effective way to rescue the endangered M. hangchowensis.     

简单剖分上的多元样条理想Gr(o)bner基

多项式理想的Gr(o)bner基理论及其算法作为计算代数的重要内容,在多项式系统的求解以及极限环构造方面也有着广泛的应用.通过引用多项式理想Gr(o)bner基的一些基本理论,给出了只有两个胞腔的多元样条理想的Gr(o)bner基及约化Gr(o)bner基的定义,并给出构造Gr(o)bner基的相应算法,然后用实例说明算法的可行性.最后,对更复杂的多个胞腔的情形进行了初步讨论,提出了需要进一步解决的一些问题.     

全基因组关联研究中的遗传位点分析方法

提出多种模型方法,对高维位点数据进行分析,为基因定位和复杂疾病性状遗传等方面的研究提供新的技术支持。为了实现关联位点在基因中的定位,首先建立映射模型,对每个位点的碱基对重新编码;然后,提出将质量控制模型与关联分析模型相结合的方法,确定位点的关联程度;随后利用基于随机森林的重要性排序,筛选与该遗传疾病最相关的致病位点;最后,设计出高维RBF神经网络,得到每个位点对性状的相关性系数,探索出与疾病多类性状相关的位点。结合多种检验方式,验证所建模型能够较为准确地定位与疾病相关的位点及基因。各类模型具有极强的推广性,广泛适用于筛选占有各自权值的大样本数据。     

复合结构的静电感应器件

复合结构的静电感应器件李思渊，刘肃，刘瑞喜，杨建红（兰州大学）关键词静电感应器件，复合结构，Ｉ～Ｖ特性表面栅结构（Ｓ－－８）和埋栅结构（ＨＳ）作为静电感应器件的基本结构已由若干作者进行过研究”－”．近几年我们采用了一种介于上述两种结构之间的结构（用０...     

Inhibitory effect of cytembena (sodium-cis-beta-methoxybenzoyl-beta-bromoacrylate) on the cell kinetics of HeLa cells in culture

The inhibiting effect of Cytembena on HeLa cell kinetics has been demonstrated and analyzed. The percentage of cycling cells decreases, according to the concentration, between 7.5 and 2.5 x 10(-5) M. Estimation of DNA by cell flow cytophotometry shows an important shift in the distribution of cycling cells with a relative decrease of G1 cells and a very important accumulation of G2 cells. According to our experimental conditions, the blocking up in G2 is irreversible only at 7.5 x 10(-5) M.     

Evolution of ovarian grafts in male guinea-pigs castrated the first day of life

Résumé Des cobayes mâles ont été châtrés le premier jour après leur naissance; à l'âge de 60 jours, on leur grèffa un ovaire provenant d'un cobaye prépubère et le laissa évoluer pendant 60 jours. Les ovaires greffés ont présenté, dans chaque cas, l'aspect d'un ovaire polycystique, avec des follicules bien développés et sans corps jaunes. Il en faut conclure que la différenciation de l'hypothalamus, chez le cobaye, s'accomplit avant la naissance.

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Fellow of the University of R.O.U. (Comisión de dedicación total).

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With the technical assistance ofD. Zipitria.     

用快速热工艺氮化超薄SiO2膜的研究

将热生长的超薄（４－２３ｎｍ）ＳｉＯ２置于用卤素钨灯作辐射热源的快速工艺系统中，用快速热氮化工艺制备了超薄的ＳｉＯｘＮｙ膜。研究表明，设定温度是工艺的关键。研究ＲＴＮ过程的化学和动力学与温度关系及其对氮化质量的影响，比较各种不同条件ＲＴＮ制备的ＳｉＯｘＮｙ膜的ＡＥＳ测量的结果，得到ＲＴＮ反应的临界混度约为９００℃，初步了灯眼薄ＳｉＯ２生长动力学的氮／氧替代的微观过程。