Science Letters:Discovery of ultrahigh-T spinel-garnet granulite with pure CO_2 fluid inclusions from the Altay orogenic belt, NW China

We first report discovery of the spinel-garnet-orthopyroxene granulite with pure CO2 fluid inclusions from the Fuyun region of the late Paleozoic Altay orogenic belt in Central Asia, NW China. The rock is characterized by an assemblage of garnet, orthopyroxene, spinel, cordierite, biotite, plagioclase and quartz. Symplectites of orthopyroxene and spinel, and orthopyroxene and cordierite indicate decompression under UHT conditions. Mineral chemistry shows that the or-thopyroxenes have high XMg and A12O3 contents (up to 9.23 wt%). Biotites are enriched in TiO2 and XMg and are stable under granulite facies conditions. The garnet and quartz from the rock carry monophase fluid inclusions which show peak melting temperatures of around -56.7℃, indicating a pure CO2 species being presented during the ultrahigh-T metamorphism in the Altay orogenic belt. The inclusions homogenize into a liquid phase at temperatures around 15.3-23.8℃ translating into CO2 densities of the order of 0.86-0.88 g/cm3. Based on prelim     

关于理科教育的一种理论根据

关于理科教育的任何一种合理的理论根据必须包括教育目的、学科和一种学习的模型。 教育目的 关于学校应达到的目的,曾是许多论文的主题,但它们中间存在着争论和分歧。对这些争论本文将不涉及,但有一个是例外;这个例外就是美国教育政策委员会1961年报告书中扼要陈述的,即认为教育的中心目的是教学生思维。这一任务在该委员会的“美国教育的中心目的”论文中详细地阐述如下:     

友谊的处方：宽容与幽默

友谊的处方：宽容与幽默尽美编译小学生默特儿放学回家，一头扑进妈妈怀里放声大哭。＂班上的同学部讨厌我，＂她啜泣着说。＂你为什么会这么想呢？＂妈妈问道．并用温柔的手轻轻抚摸着默特儿的头发。＂课间休息时，一个男孩怪声怪气地叫着：＇默特儿，默特尔，跑得慢像个...     

小试“对比法”

小试“对比法”浙江王铨美青年学生一方面好胜心强，渴望成功；一方面又往往由于见识不广，取得一定成绩就易自我陶醉，满足现状。教学上运用「对比法」可以克服他们的自满情绪，激励他们的学习上进心．我在教烹饪实习课的整个教学活动中，就常常运用「对比」的方法，效果...     

值得借鉴的美国课程

说真的．带孩子到美国，对于孩子能否在美国的学校学到什么，从一开始自己的内心就有几分忐忑。也许正是因为这个原因，才会不顾及经济上的负担，立即安排孩子就读私立学校。在美国，一个比较公认的观点是，私立学校的教学质量要高于公立学校。不然的话，又有谁会自己掏钱去读私立?     

生活

L三fee,n be geed. r‘化。:n卜e’几卜:d, I苏几宜sme注r:yche(r几l, But芝ome一三mes,“d. 1亏fe eon卜e dreoms. Li化eon卜e great*hought,: L;fo con meon a pe一芝on, Sitling sn eou一t. 1 ife eon be di一ty, L于fe:。n曰。n be roinfol: But Iife丁5 what you川。ke if, 50 tlyto川ake it卜eau.于fUI. 生活 兰斯顿.休斯 生活可以美满, 生活可以悲伤, 生活时常充满欢乐, 但有时令人沮丧。 生活可以是梦想, 生活可以是伟大的思想; 生活也可能意味着一个人, 站在被告席上。一孕 生活可以是肮脏, 生活甚至可以是痛苦;·、 但是生活…     

谈谈《雷雨》的对话

高中语文第四册节选了曹禺四幕话剧《雷雨》的第二幕。讲授好这幕话剧,不仅能使学生了解三十年代中国的社会现实,激发学生对今天社会主义祖国的热爱,而且还可以使学生受到戏剧文学语言艺术的熏陶。文学是语言艺术,而话剧同其它文学形式的语言相比,又有其独特之处。比如小说作者塑造人物时可以从多方面来叙述描写,可以写人物的肖象、行动、心理,也可以通过写景物、写别人来衬托,写人物的对话只占小说的很小部分。话剧则不同,话剧的唯一手段就是     

Features of the Formation of Multi-view Autostereoscopic Image without Vertical Parallax

1.Introduction The reproduction systems of 3D images without using eyeglasses and other special accessories has always attracted attention and aroused great interest of developers and consumers of such equipment because of totally accurate image and method of its presentation.Such systems can be used and are already partially used in advertising,television,different devices (i.e.smartphones,tablet computers),at the exhibitions,etc.,as well as in various technical applications,training systems,simulators,etc.     

Simulation of Fragment Impact on Multi-Layer Targets Using Contact Method

Cased explosives generate highly energetic fragments as their casing breaks up. Due to the complexity of casing fragment related behavior such as embedment, perforation and ricochet, it may be insufficient to use equivalent triangular pressure loading in fragment impact simulations. This simplified method may over- or under-predict the target response. Recently, a procedure using contact techniques has been proposed to overcome such difficulties. It has been shown that the new method has the inherent capability in modeling the multi-piece and multi-hit fragment impact problems in a more realistic way. To investigate the applicability of the proposed method to simulations involving multi-layer penetration, the selected problems of fragment impact on multi-layer targets are described in this paper. It is demonstrated that this method is capable of predicting the complicated multi-layer structural response caused by fragment impact and penetration. Modeling procedures and some technical issues are also discussed.     

例谈课堂典型例题设计

例1 图2分别表示的是基因的结构示意图和科学家通过基因工程培育抗虫棉时，从苏云金芽孢杆菌中提取抗虫基因开始，到“放入”棉花细胞中与棉花的DNA分子结合起来而发挥作用的过程示意图。请据图回答下列有关问题：