硅酸盐-盐（硫酸盐）流体不混溶：蒙古南部Mushugai-Khuduk含火成碳酸岩杂岩体矿物中的熔体包裹体研究

Crystalline and melt inclusions were studied in garnet, diopside, potassium feldspar, and sphene from the garnet syenite porphyry of the carbonatite-bearing complex Mushugai-Khuduk, southern Mongolia. Phlogopite, clinopyroxene, albite, potassium feldspar, sphene, wollastonite, magnetite, Ca and Sr sulfates, fluorite, and apatite were identified among the crystalline inclusions. The melt inclusions were homogenized at 1010℃～1080℃ and analyzed on an electron microprobe. Silicate, salt, and combined silicate-salt melt inclusions were found. Silicate melts show considerable variations in SiO2 concentration （56 to 66wt% ）, high Na2O ＋ K20 （up to 17wt% ）, and elevated Zr, F, and Cl contents. In terms of bulk rock chemistry, the silicate melts are alkali syenites. During thermometric experiments, salt melt inclusions quenched into homogeneous glasses of predominantly sulfate compositions containing no more than 1.3wt% SiO2. These melts are enriched in alkalis, Ba, Sr, P, F, and Cl. The investigation of the silicate and salt melt inclusions in minerals of the garnet syenite porphyries indicate that these rocks were formed under influence of the processes of crystallization differentiation and magma separation into immiscible silicate and salt （sulfate）liquids.     

计划之外有惊喜

正有计划、有目标、有希望、有梦想固然是有益的,但也还是要敞开心扉、不带偏见的接受新变化。"太好了!"亚娜一边说一边打开清单,看萨姆说的项目是否在她的清单上。萨姆打开电脑:"你想当哪只蝙蝠?""哪只蝙蝠?"亚娜机械地重复了一遍,一时没有弄清楚他的意思。"我刚弄到最新的一款电脑游戏,名叫《蝙蝠的冒险》。"萨姆解释道,"蝙蝠是最酷的小动物。虽然说游戏里有大量的动作和     

A parametric study on the contact stress of half toroidal continuously variable transmission

1. Introduction A toroidal continuously variable transmission (CVT) that uses a traction drive to transmit torque has a vastly larger torque capacity than a conventional CVT. This transmission technology has attracted considerable interest owing to its capability in substantially improving vehicle fuel economy and power performance [1]. The half toroidal CVT transmits torque by means of shear resistance of the traction fluid film taking advantage of the property of the fluid solidificatio…     

State-of-the-art quantum cryptography network

China's first computer network in which communications are secured with quantum cryptography has been successfully tested in Beijing.     

79 new cyclopeptides discovered from 28 plants

A key innovative research result has been achieved in systematic chemistry of plant cyclopeptides (PCPs), a group of important plant metabolites, by a research team with the CAS Kunming Institute of Botany (KIB)in the capital of southwest China's Yunnan Province. According to a recent announcement released by the Institute, its chemists have brought to light 79 new PCPs.     

请你玩玩蛋白钟

巴黎巴斯德学院的Monod和Jacob在20世纪50年代证明，埃希氏大肠杆菌中的某些控制蛋白质可以抑制其他蛋白质的生成。我们可以用符号X→Y来表示蛋白质X抑制蛋白质Y。如果蛋白质X出现，那么蛋白质Y很快（如1秒钟）就会消失；如果蛋白质X消失，并且没有抑制蛋白质Y的其他蛋白质出现，那么Y在X消失后1秒钟就会出现。     

用鸡胚心脏进行器官培养的实验

本文所述的实验是想告诉学生怎样用器官培养来研究发育问题,而此实验只需将目前许多普遍生物实验课中都进行的活鸡胚一般观察的实验,加以延伸即可。先让学生观察制作孵化48小时鸡胚标本的全过程,使他们熟悉鸡胚的介剖:要他们特别注意静脉窦、心房、心室和主动脉弓的位置。接下来发给学生一个生活了55—72小时的鸡胚,按照实验指导(许多实验手册中的指导是适用的,如Evert. Saigo,和Eichhorn 1979 Eberhard,Arms,和Camp 1927),把鸡胚     

探索MOOC教学方法在mLearning中的运用

本文把大型开放式网络课程(Massively Open Online Course,以下简称MOOC)作为适应移动学习( mLearning)的一种可能的教学方法,这种教学方法建立在与当前学习或教学形式相适宜的基础上.本文呈现了一个MobiMOOC应用的案例研究,该案例使用MOOC形式创建一门课程,研究展示了MOOC和mLearning之间的协同特性,并将当前数字化的协作学习和知识建构这两个理想领域结合在一起.MobiMOOC是聚焦于mlearning、为期六周的网上课程,于2011年的4月到5月之间进行.MobiMOOC是免费开放的课程,有556位学习者加入了课程谷歌群组.课程结束时的调查结果有力地证明了MOOCs和mLearning之间的协同作用.本篇论文对时间和地点的独立性、情境学习、协作学习、潜在的跨学科信息交流,以及应用于网上学习的技术,如社交媒体,移动设备等方面进行了探讨.     

中、美两国企业新产品开发方面的比较研究

以研究中美两国企业成功开发新产品的过程及其绩效结果为目的,在文献研究的基础上,首先,构建了基于"能力-优势位置-绩效"观点的成功开发新产品的模型架构,并提出研究假设,其次,利用时中国和美国企业调研的数据对模型进行了实证检验,再次,对比分析了中美两国企业新产品开发的过程和影响因素的作用,最后,探究了中关企业新产品开发过程中的异同.研究结果表明,中国企业产品创新影响因素的作用和影响过程与美国等发达国家有着大体相同的过程路径,但一些主要影响因素对于企业成功开发新产品所起作用的强弱程度异于美国.     

Composites with high omnidirectional fracture toughness due to helical interlocking fasteners are found in gingko seed shellsOA

<正>Engineering of composites mimicking load-bearing materials from living organisms is essential for sustainable economic development and successful resolution of current and future bottle-necks of chemical,automotive,aviation,biomedical,and robotic technologies.As pointed out by G.Wiedemann[1]in 1853 and M.F.Ashby et al.