高校主办的科技期刊建设与发展经验——以《中外公路》实践为例

科技发展日新月异,高校科技期刊作为科技发展宣传阵地,理应与时俱进。基于我国科技期刊发展现状,结合《中外公路》杂志的办刊实践,本文论述了新形势下高校科技期刊发展中需重视的几个问题,以提升我国高校科技期刊的市场竞争力。     

一种利用有限差分来正演模拟声波波形的方法

声波波形对于研究井旁地层的情况有着非常重要的意义。有限差分是常用的正演方法。本文利用有限差分的方法对软地层和硬地层的不同模型进行计算,并对结果进行了分析。     

研究生城市地下工程教学新方法探析

本文针对城市地下工程的课程特点,结合多年教学实践经验,就如何实现该课程的教学目的,分别从课程特点、教学内容、教学方法、教学效果等多方面进行深入探讨,结果表明,所采用的新的教学方法和教学形式能够明显提高研究生城市地下工程课程的教学效果。     

基于专利分析的我国云计算技术发展现状研究

本文针对云计算行业相关技术进行深入的专利分析,目的在于摸清国内外云计算行业中的技术发展状况和趋势,并为云计算行业内技术的顺利实施提供专利策略和专利布局建议。本文对云计算技术的总体趋势、专利区域分布、重点专利技术、法律状态和云计算服务模式等做了全面的剖析。从中可了解该领域技术领先国家,重点公司及其技术。为我国云计算云计算专利战略提出发展建议。     

芍药属的研究(1)——国产几个野生种核型的报道

In the present paper 8 species with 15 populations of the genus Paeonia L. (if P. papaveracea and P. japonica are recognised as species) were collected from Sichuan, Shaanxi and Hebei provinces (see the Appendix for detail of the materials).  The micrographs of their somatic metaphase (also Mii in the case of P.veitchii) are shown in Plates 1-4, the karyo- type formulae, ranges of chromosome length and classification of karyotypes according to Steb- bins (1971) are shown in Table 5: the idiograms in Figs. 1-2, and the parameters of chromo- somes in Table 1-4.  The essential points are mentioned as follows:        (1)   Chromosomes of the various species in the section Modan have so far been examined and they are all diploid, the two species in the section Onaepia are also diploid, and thus tetraploids exist only in the section Paeonia.        (2)  Chromosomes in the genus Paeonia are relatively stable except for the differentiation of ploidy.  The karyotypes (Table 1-4) show no differences among different taxa in Sect. Modan and the same can also be said about the taxa in Sect. Paeonia (Table 1).  Not only are the karyotypes very similar, but also among the members within  either section have the same parameters of chromosomes, and, differences, if occur, are not statistically significant. Between the two sections, however, the situation is different. The arm ratios of the first pairs of chromosomes in Sect. Modan are 1.53, 1.52 and 1.48 (Table 1), but those in Sect. Paeonia are 1.12-1.28 (Table 2-4), 95% confidence limits are 1.46-1.60 for the section Modan and 1.07-1.28 (1.21-1.35 only for PB85078) for the section Paeonia, not overlapping, which indi- cates that the two sections have differentiated in respect of the first pairs of chromosomes.        (3)The population PB85024, which belongs to the P. obovata complex, has a karyotype of 2B (stebbins, 1971), which is a new one in the genus Paeonia. This karyotype is a stable one, for several individuals in the population are uniform in this respect, which shows that Steb- bins’ (1971) generalization that all the species in Paeonia have 2A does not hold true.        (4)  Three populations of P. obovata complex studied in this work from Sichuan and Shaanxi are all tetraploids, and one from Hebei is a diploid.  From the present work and the previcus reports, the materials from Japan and Korea, no matter whether flowers are pink or white, are diploids, those from Heilongjiang Province (with both pink and white flowers) (Liu Ming-yuan, personal communication) and from Heibei Province (with pink flowers) in China are also diploids, the one from Sakhalin (pink flowers) is tetraploid, those from Priamur of the Soviet Union are a tetraploid (with white flowers) and a diploid (with pink flowers), and those from Shaanxi (the Qinling Range) and western Sichuan (with both pink and white flowers) are all tetraploids.  As far as we have now known, ploidy in this parti- cular complex is correlated with the geographical distribution: diploids are found in the cen- tral part, tetraploids occur in the northern limits, and in the south  letraploids are the only cytotype.      (5)  The materials of P. mairei from western Sichuan and Shaanxi (the Qinling Range) are found all to be tetraploids, which shows that two cytotypes, diploid and tetraploid, exist in this  species,  but the geographical distribution pattern of these two cytotypes is to be revealed in the future investigation.     

系统集成技术的基础研究

系统集成技术已成为当前电子技术发展的一个主要方向。本文介绍了系统集成技术的基本概念、主要内容和应用,指出系统集成技术的基础研究对发展我国微电子工业的重大意义。本文还介绍了该项研究作为国家自然科学基金会重大项目已取得的进展和成果。     

浙江产7种菝葜的染色体研究

本文报道浙江产菝葜属smilax 7个种的染色体数目和核型。S．nipponica有两种核型，2n＝   26和2n=32，均为3B型，但后一种细胞型的雄株的第一对染色体大小不等，可能为性染色体；S.   riparia 2n=30，属3B型；S．siebodii n＝16；S. china有两个染色体数目，2n＝96 和n＝15；   S. davidiana 2n=32，属3B型，对减数分裂MI的观察发现n＝16；S．glabra 2n=32，亦属3B   型：S. nervo-marginata var．liukiuensis 2n=32，属3C型。讨论了种间在核型上的差异、属的基数、   核型演化趋势和性染色体等问题。     

硝酸改性花生壳吸附处理含Cr6+废水的实验研究

本文研究了改性花生壳对废水中Cr6+的去除效果,在所实验的影响吸附效果的因素中,pH值的影响最大,投加量和反应时间次之,初始浓度的影响最小。最佳吸附条件为:处理50.00 mL Cr6+的浓度为20.00μg/mL,改性花生壳投加量1.0000g,吸附接触时间100 min,吸附体系pH值3.0,常温条件对Cr6+的去除率达94.00%以上。     

中国碳排放强度影响因素的动态效应分析

近年来国内外对碳排放与碳排放强度的因素分解研究,大部分集中在影响因素个体的贡献程度上,而对于影响因素的稳定性及其对碳排放或碳排放强度变化的动态冲击效应方面,缺乏相应的深入研究。本文采用Kaya恒等式的改进模型,对碳排放强度进行因素分解,得到碳排放因子、能源强度、能源结构与产业结构四个影响因素。以1980年-2009年国内的各项相关数据为基础数据,对能源强度、能源结构与产业结构与碳排放强度的相关性进行平稳性检验,并对碳排放强度与能源强度、能源结构、产业结构进行整体协整检验,检验通过后运用脉冲响应函数分析三种影像因素的变化对碳排放强度的冲击效应;利用SVAR模型中的方差分解功能,计算三种影响因素对碳排放强度的贡献度,结果显示能源结构对碳排放强度的冲击效应最弱,能源强度稍强,第三产业比重效果最为显著。     

房屋“平改坡”结构设计探讨

分析了房屋＂平改坡＂的重要意义,阐述了＂平改坡＂的结构设计,提出了＂平改坡＂改造中的钢筋混凝土设计和钢结构设计特点。