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971.
宣士斌 《广西民族大学学报》2002,8(3):33-36
记忆是思维的源头,如何高效组织与存储信息是机器智能活动的前提,利用神经网络的结构思想、数据库表的映射作用、属性论的事物表达思想构造的属性网络模型能有效组织与存储信息,从根本上解决存储容量和渐进学习问题,使分类搜索变得非常简单. 相似文献
972.
将单晶硅片硅烷化后,用戊二醛做醛基修饰,将5′端氨基修饰寡核苷酸探针片段通过醛-氨共价键结合在硅片上,然后用椭圆偏振光谱法对探针和不同序列样品的杂交反应进行了研究。结果表明该方法能在不对样品进行荧光标记的情况下直接研究杂交反应的效率,从而得知样品的序列信息。 相似文献
973.
对CO和H2在483K、3.5MPa条件下,在充满F-T合成产物(平均相对分子质量400)或超临界正戊烷的催化剂微孔内的扩散速率、孔内气体浓度分布以及催化剂的内表面利用率进行了模拟计算。结果表明合成气在F-T产物中的扩散速率比超临界介质中低得多,从而造成了气相反应中从催化剂孔中到孔内显著的合成气浓度梯度及催化剂内表面利用率的下降,从理论上解释了超临界条件下CO转化率和烃收率优于气相反应的原因。 相似文献
974.
黄皮尖椒品种比较试验 总被引:3,自引:0,他引:3
对引进 9个黄皮尖椒品种的植物学性状、商品性状、抗病性及丰产性进行了比较试验 .结果表明 :苗丰 2 2号植株长势旺 ,产量高 (2 0 6 5 1kg·hm- 2 ) ,抗病性强 ,果实商品性好 ;9919较耐高温 ,商品外观好 ,果较长 ,产量较高 (2 0 0 87kg·hm- 2 ) ;优美 5号产量中等 ,但果色黄绿 ,果形美观 ,易为市场接受 ;茂椒 4号果色黄绿 ,果形美观 ,单果重达 4 5 .0 0g ,极具市场竞争力 .认为这 4个品种可作为海南冬季主栽辣椒品种并加以推广 . 相似文献
975.
976.
977.
Loess in the Tian Shan and its implications for the development of the Gurbantunggut Desert and drying of northern Xinjiang 总被引:8,自引:0,他引:8
Xiaomin Fang Zhentao Shi Shengli Yang Maodu Yan Jijun Li Ping’an Jiang 《科学通报(英文版)》2002,47(16):1381-1387
Eolian loess is widely distributed on the various geomorphic surfaces between 700–2400 m a.s.l. on the northern slope of the
Tian Shan. It is formed in a synchronous manner with dust transported from the Gurbantunggut Desert in the Junggar Basin.
The thickest section of loess was found in the Shawan and Shihezi regions. Paleomagnetic and climatic proxy analyses of over
71 m of a loess-paleosol sequence on the highest terrace of the Qingshui He (River) in the Shawan show that the paleomagnetic
Bruhues/Matuyama (B/M) boundary lies at the bottom of paleosol S8, at a depth of 69.5 m, and the bottom of the sequence was
estimated to be ∼0.8 Ma. This implies that the extremely dry climatic conditions in the Junggar Basin and the initial Gurbantunggut
Desert were present at least by 0.8 Ma. High-resolution grain size series demonstrate that this area and desert expansion
experienced two dramatic periods of desert expansions that occurred at ∼0.65 Ma and 0.5 Ma, respectively; and the subsequent
continuous enhancement led to the environment presently observed. This tremendous environmental effect, caused by large-scale
expansion of the desert and arid region of inner Asia, might be an important driving force for the global temperature drop
that occurred in the mid-Pleistocene. 相似文献
978.
PGE patterns of ores of Dajing Cu-polymetallic deposit in Linxi County,Inner Mongolia: Indicator to source of metallogenic elements 总被引:1,自引:0,他引:1
By comparing PGE patterns of sulfide ores with that of basic-ultrabasic dikes occurring in the Dajing Cu-polymetallic deposit,
we discover that there are similar positive slopes between the basic-ultrabasic dikes and the black ores composed mainly of
sphalerite and galena, reflecting affinity of their source. The PGE patterns of the yellow ores composed basically of chalcopyrite,
arsenopyrite and pyrite are actually different. One is close to the pattern of the mantle lherzolite, and others resemble
the pattern of the basic rocks. However, the concentrations of Ru are higher in the yellow ores, reflecting that sulfur attains
or approaches saturation in their parent magma. The PGE characteristics of ores and dikes show that the magmas derived from
the deep of crust and the metallogenic elements were supplied mainly by growth material of the crust. In addition, the mantle-derived
magma also offered some elements. 相似文献
979.
The study and comparison of sequences of characters from a finite alphabet is relevant to various areas of science, notably
molecular biology. The measurement of sequence similarity involves the consideration of the possible sequence alignments in
order to find an optimal one for which the “distance” between sequences is minimum. In biology informatics area, it is a more
important and difficult problem due to the long length (100 at least) of sequence, this cause the compute complexity and large
memory require. By associating a path in a lattice to each alignment, a geometric insight can be brought into the problem
of finding an optimal alignment, this give an obvious encoding of each path. This problem can be solved by applying genetic
algorithm, which is more efficient than dynamic programming and hidden Markov model using commomly now.
Foundation item: Supported by Zi-qiang Foundation of Wuhan University and Open Foundation of the State Key-Laboratory of Software
Engineering, Wuhan University
Biography: Shi Feng(1966-), male, Associate professor, research direction: bioinformatics. 相似文献
980.
We extend the multiple-scattering theory (MST) for elastic wave scattering and propagating in two-dimensional composite. The
formalism for the band structure calculation is presented by taking into account the full vector character of the elastic
wave. As a demonstration of application of the formalism we calculate the band structure of elastic wave propagating in a
two-dimensional periodic arrangement of cylinders. The results manifest that the MST shows great promise in complementing
the plane-wave (PW) approach for the study of elastic wave.
Foundation item: Supported by the National Natural Science Foundation of China (No. 10174054)
Biography: Mei Jun (1977-), male, Master candidate, research direction: the multiple scattering theory 相似文献