Structure characterization for the geopolymer of sodium silicate and metakaolin

1 Introduction 1 During the last decade a new kind of material called geopolymer has emerged as a viable alternative for many conventional cements and plastics. Geopolymer is inorganic polymer derived from metakaolin and sodium silicate solution. It can be synthesized at low temperature and have useful properties such as high compressive strength. It is stable at temperatures up to 800 °C and even 1150 °C while ordinary Portland cement loses its strength at 500 °C [1]. Several microstruct…     

论郭店竹简的《诗》学批评

郭店竹简中《诗》学内容十分丰富。从郭店竹简的引《诗》、用《诗》可以发现,战国中后期,《诗》已经被儒家经典化,而且成为一种品评标准,被广泛运用于政教批评、言行评论以及心理批评等方面,充分显示出战国《诗》学批评的发展繁荣。     

The Philippines,the East Asian ‘developmental states’ and education: a comparative analysis of why the Philippines failed to develop

After WWII, the economic prospects of the Philippines, then the second-largest economy in Asia, were viewed positively, but by the mid-1970s it had become Asia’s developmental puzzle for its failure to sustain economic growth. In contrast during the same period, regional neighbours, Hong Kong, Taiwan, South Korea and Singapore, achieved previously unknown levels of economic growth and were dubbed the ‘East Asian Tigers’. This article analyses the post-war development of the Philippines, focusing on the role that education played, and contrasts it with the East Asian Tigers. It is argued that the Philippines was distinctive in the state’s failure to exercise strong central control, especially of the education system, which was neither harnessed to promote economic development nor national unity. The status quo, which has its origins in a plantation economy, prevailed, and this ensured the country remained an unequal and impoverished democracy.     

丙烯与氧原子反应机理的理论研究

利用密度泛函理论(DFT)中的B3LYP方法,在6-31+G(d,p)理论水平上对丙烯与氧原子的反应机理进行了研究.对反应物、产物、中间体及过渡态进行了优化,并通过内禀反应坐标(IRC)计算和振动分析对反应过渡态进行了确认.计算结果表明,氧原子与丙烯可以快速复合形成多种中间体,然后经历异构化、解离反应生成各种产物如CH3CH2CHO、CH3COCH3、不饱和烃以及H2O、OH、H.丙烯与氧原子反应通道主要有异构化、置氢和脱水反应3个过程.     

近三十年来渤海历史地理研究综述

渤海国疆域内共建有五京、十五府、六十二州、一百三十多个县,其中关于渤海五京的研究综述已有另文叙述。文章主要从渤海国早期建国都城东牟山的地理位置,渤海国五京所辖的十五府的地理位置。渤海国五京十五府下辖的州、县的地理位置,渤海国的二十四块石及其交通等四个方面对近三十年来渤海国的府、州、县历史地理研究状况进行了梳理。     

Mood States as Predictors of Characteristics and Precipitants of Suicidality Among College Students

This article examines college students' self-reported mood states during a suicidal crisis and the relationship between mood and indicators of suicidality. Multilevel modeling demonstrated that the moods of hopelessness and anger predicted stronger intent; anxiety/worry predicted weaker thoughts of suicide; hopelessness increased the odds of receiving professional help, having a specific plan, and having contemplated methods; and guilt decreased the odds of having made preparations for an attempt. The associations between mood and precipitants of suicidal ideation are presented. Implications of these findings for increasing collaboration during the course of risk assessment and treatment are also discussed.     

叠加相干态及其性质

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ｉｎｑｕａｎｔｕｍｏｐｔｉｃｓ ,ｓｏｍｅｎｏｎ ｃｌａｓｓｉｃａｌｓｔａｔｅｓｏｆｌｉｇｈｔｈａｖｅｂｅｅｎｓｔｕｄｉｅｄｒｅｃｅｎｔｌｙ .Ｉｎｐａｒｔｉｃｕｌａｒ ,ｔｈｏｓｅｏｐｔｉｃａｌｓｕｐｅｒｐｏｓｉｔｉｏｎｓｔａｔｅｓ ,ｗｈｉｃｈａｒｅｂａｓｅｄｏｎｔｈｅｐｒｉｎｃｉｐｌｅｏｆｑｕａｎｔｕｍｓｕｐｅｒｐｏｓｉｔｉｏｎ ,ｇｉｖｅｒｉｓｅｔｏｖａｒｉｏｕｓｎｏｎ ｃｌａｓｓｉｃａｌｐｒｏｐｅｒｔｉｅｓ.Ｎｕｍｂｅｒｓｕｐｅｒｐｏｓｉｔｉｏｎｓｔａｔｅｓ[1] ａｒｅｐ…     

屈原时代：楚与齐之文化交流

战国中后期，亦即屈原时代，既是楚国与北方诸国争强较胜的时代，也是与中原文化积极交流的时代，而交流的重点对象乃是齐文化。从战国中后期中原文化的地域特征、屈原时代的齐楚文化交流活动，以及屈原等人所受齐文化的影响诸方面着手，可具体描述这一事实。     

美国从业人员“工匠精神”的历史溯源与形成机制

从业人员的工匠精神是美国得以振兴、发展的强力支撑,其形成得益于移民基因的多元、公平与效率的倡导、实用主义文化的推崇、标准战略的实施、职业教育体系的单轨。研究美国从业人员工匠精神的历史溯源和形成机制,可以为我国工匠精神的培育与弘扬提供借鉴。     

美国中学教学案例的启示

本文通过美国中学社会学教学案例,探讨了美国中学教育的特色和教育思想,为我国推进素质教育和教学改革提供参考.