水斗数对转轮性能影响的实验研究

研究了水斗数对冲击式水轮机性能的影响．对水斗数不等的几个转轮进行了能量试验，发现水斗数与转轮性能密切相关，进而探讨了水斗数对转轮性能影响的原因，为选型时正确确定水斗数提供帮助．     

油菜花序轴组织培养中愈伤组织同工酶和可溶性蛋白质变化的研究

本文报道了在愈伤组织形成过程中,酯酶、过氧化物酶同工酶及可溶性蛋白质含量的变化,并讨论了愈伤组织形成与这些大分子变化之间的关系。     

Direct detection of more than 50% of the Duchenne muscular dystrophy mutations by field inversion gels

Duchenne muscular dystrophy (DMD) is an X-linked disorder affecting about 1 in 3,500 males. It is allelic with the milder Becker muscular dystrophy. The biochemical basis for both diseases is unknown and no effective treatment is available. Long-range physical mapping has shown that the DMD gene, localized in Xp21, is extremely large, exceeding 2 million base pairs. Until now, carrier detection and prenatal diagnosis has involved the use of linked restriction fragment length polymorphism markers which detect muscular dystrophy-associated deletions in about 10% of the cases. Field inversion gel electrophoresis (FIGE) allows the detection of structural rearrangements in 21 out of 39 of the DMD patients studied (54%), of which 14 (65%) were not detected by conventional methods. Large deletions seem to make up a much higher fraction of the DMD mutations than so far indicated by other methods. A region prone to deletion was located in the distal half of the gene. FIGE analysis could provide a valuable extension of information for carrier detection and prenatal diagnosis. The technique should be generally applicable to the study of diseases involving structural chromosomal rearrangements.     

Early Cambrian phosphatized blastula- and gastrula-stage animal fossils from southern Shaanxi

Marine invertebrate animal embryos and their early developmental products are of great significance to the study of taxonomy and phylogeny of early animals. A great number of phosphatized globular fossils were collected fromthe early Cambrian Kuanchuanpu Member (upper Dengying Formation), southern Shaanxi, and a nearly complete develo-pmental sequence—from a fertilized egg, via blastodisc formation, blastula development, blastodisc enlargement toward gastrulae, to tissue differentiation—can be discerned in this collection. This discovery provides unmatchable material for studies on the origin, taxonomy, radiation, and ontogeny of early metazoans.     

原油沥青质吸附与沉积对储层岩石润湿性和渗透率的影响

原油沥青质吸附引起的油藏岩石润湿性改变和沥青质沉积对储层孔喉的堵塞是造成储层损害、导致油井产能下降的重要机理之一。首先 ,采用改进的自吸速率法和分光光度法 ,研究了原油沥青质吸附所引起的砂岩岩样润湿指数的变化 ;然后 ,利用岩心流动实验方法 ,定量评价了稠油沥青质沉积对储层岩石渗透率的影响。实验结果表明 ,岩心润湿指数随沥青质吸附量的增加而减小 ,从而导致油相的相对渗透率降低。地层水的离子组成是影响水湿性的主要因素之一。地层水所含无机阳离子的化合价价数越高 ,它与沥青质的协同作用所引起的润湿指数下降的程度越大。储层岩心油相渗透率下降的程度与沥青质沉积量和储层岩心的原始渗透率有关 ,沉积量越大或原始渗透率越低 ,则油相渗透率下降幅度越大。因此 ,对于原油中富含沥青质的油藏 ,特别是稠油油藏 ,尽可能抑制沥青质的吸附和沉积是保护储层的一项重要措施。     

The Balang Fauna―A new early Cambrian Fauna from Kaili City, Guizhou Province

In April 2004, Wu Yishan, a teacher from Kaili No. 4 Middle School, took his students to Wenglingtang to conduct popular science activities. They found fossils of trilobites and eocrinoids in gray and gray-greenish silty shale, and calcareous, silty mudrock in the upper part of the lower Cambrian Balang Formation. In May 2004, we were invited to investigate the new discovery.     

Early Cambrian protoconodonts and conodont-like fossils from China: Taxonomic revisions and stratigraphic implications

Tooth likephosphaticprotoconodontsand“con odont likefossils”arecharacteristiccomponentsoftheEarlyCambriansmallshellyfossils (SSF )withaworldwidedistribution .Theyarerepresentedexclu sivelybyisolatedscleritesandareoften presentinaceticacid etchedresiduesfromLowerCambriancar bonates .SincethefirstreportofProtohertzinaMis sarzhevsky 1973fromthebasalCambrianoftheYangtzePlatformin 1977[1] ,andalongwithenthusi asticresearchactivitiesonthesmallshellyfossilsandcandidatesectionsforaglobalPrecamb…     

Nanostructured TiO2（B）:the effect of size and shape on anode properties for Li-ion batteries

Reducing the dimensions of electrode materials from the micron to the nanoscale can have a profound influence on their properties and hence on the performance of electrochemical devices,e.g.Li-ion batteries,that employ such electrodes.TiO2(B) has received growing interest as a possible anode for Li-ion batteries in recent years.It offers the possibility of higher energy storage compared with the commercialized Li4Ti5O12.Bulk,nanowire,nanotube,and nanoparticle morphologies have been prepared and studied.However,to date these materials have not be compared in one article.In the current review we first summarize the different synthesis methods for the preparation of nanostructured TiO2(B);then present the effects of size and shape on the electrochemical properties.Finally TiO2(B) with nanometer dimensions exhibit a higher capacity to store Li,regardless of rate,due to structural distortions inherent at the nanoscale.     

十次幂和问题的解

给出不定方程１０＝ ｙ１０的一组正整数解     

利用模板实现持久类

介绍了利用模板技术在母语中定义持久类的实现方法．该方法通过抽象持久类的一般特性定义出持久类的共同的类模板，定义持久类的过程就是由类模板生成模板类的过程．该方法完全区分持久语义和挥发语义，能很好地处理属性的多态性，易于管理持久对象，为最终实现面向对象数据库和持久性程序设计语言提供了很好的基础