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Swearing in Modern British English-The Case of DAMN in BNC 被引量:1
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作者 龚群子 《海外英语》 2013年第14期267-269,共3页
Before the research conducted by Anthony McEnery and Zhonghua Xiao(2004), there has not been any systematic account of swear-words in English. It may be because a lack of well-annotated corpus resources. However, the ... Before the research conducted by Anthony McEnery and Zhonghua Xiao(2004), there has not been any systematic account of swear-words in English. It may be because a lack of well-annotated corpus resources. However, the creation of BNC, which is a balanced and richly annotated corpus, makes it possible to explore swearing from various sociolinguistic variables, such as age, gender and education level. Based on McEnery and Xiao's research, this article applies similar methods to another English word-DAMN, a typical swear-word which frequently occurs in BNC and also in everyday language use. This article will make full use of BNC to explore a detailed distribute pattern of DAMN within spoken registers, within written registers and across these two registers. Besides, the article will also try to find out the limitations of corpus methodology. 展开更多
关键词 BNC CORPUS damn sociolinguistic VARIABLE swear
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高氮含能材料H_(4)TTP合成工艺优化
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作者 丁倩楠 刘文东 +5 位作者 王小军 徐子帅 李子扬 刘继开 李永祥 申帆帆 《火炸药学报》 EI CAS CSCD 北大核心 2024年第1期29-34,共6页
为了寻求新型高氮含能材料,以2,3-二氨基-2-丁烯二腈(DAMN)为原料,经过氧化缩合、叠氮反应两步法合成了2,3,5,6-四(1H-四唑-5-基)吡嗪(H_(4)TTP);通过傅里叶变换红外光谱(FTIR)、核磁共振、质谱、元素分析对H_(4)TTP进行了表征。在原工... 为了寻求新型高氮含能材料,以2,3-二氨基-2-丁烯二腈(DAMN)为原料,经过氧化缩合、叠氮反应两步法合成了2,3,5,6-四(1H-四唑-5-基)吡嗪(H_(4)TTP);通过傅里叶变换红外光谱(FTIR)、核磁共振、质谱、元素分析对H_(4)TTP进行了表征。在原工艺基础上,以添加稳定剂四丁基溴化铵(TBAB)、改变最终酸度值的方法对原工艺进行改进,在单因素试验基础上,以H_(4)TTP的得率为响应值,用响应面法优化其反应条件,研究了反应温度、反应时间、吡嗪四腈(TCP)与叠氮化钠(NaN_(3))的摩尔比3个因素对叠氮反应的影响,建立了H_(4)TTP的得率与3个相关因素的回归方程,所得模型的R^(2)值为0.9992,证明该回归方程高度拟合。结果表明,叠氮反应较佳工艺条件为:以二甲基亚砜(DMSO)为溶剂,TBAB为稳定剂,2,3,5,6-吡嗪四腈(TCP)与叠氮化钠的摩尔比为1∶4.4,反应温度124℃,反应时间42h、搅拌速率400r/min,H_(4)TTP的得率为89.73%,与模型预测值90.61%基本相符,进一步验证了所选模型的合理性。与原工艺相比,工艺优化后的目标产物H_(4)TTP得率提高7%左右。 展开更多
关键词 有机化学 2 3 5 6-四(1H-四唑-5-基)吡嗪(H_(4)TTP) damn 响应面法 高氮含能材料
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Vertical variation of trace elements and its relation to the water-bearing capacity of Ordovician strata,in Datun coal field 被引量:1
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作者 LIU Huai-zhong HAN Bao-ping 《Mining Science and Technology》 EI CAS 2009年第2期166-169,共4页
We tested for fourteen trace elements in samples collected from the Ordovician strata in Datun coal field. The vertical concentration variation of these trace dements is reported. The relationship of the variation to ... We tested for fourteen trace elements in samples collected from the Ordovician strata in Datun coal field. The vertical concentration variation of these trace dements is reported. The relationship of the variation to the water-bearing capacity of the Ordovician strata is discussed. The minimum concentration of eleven (of 14 total) trace elements appears in the lower Majiagou formation. The maximum concentrations mainly appear in the Badou and Jiawang formations: eight maxima are located in Badou and four more are in Jiawang. The study of karst development and the water-bearing capacity of Ordovician strata shows that karst is well developed in the Majiagou formation and there is a consequent high water-bearing capacity in this formation: Badou and Jiawang formations are contrary to this situation. The results illustrate that the minimum concentrations of most trace elements within certain Ordovician formations can be taken as strong evidence for the existence of a well developed karst and a high water-bearing capacity. 展开更多
关键词 ORDOVICIAN trace element water-bearing capacity damn coal field
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二氨基顺丁烯二腈(DAMN)
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作者 张育川 《精细与专用化学品》 CAS 2001年第11期21-22,共2页
二氨基顺丁烯二腈(DAMN)是一种重要的化工原料,可用于合成治癌剂、微生物培养剂、调味品、药品等。目前,只有日本曹达一家企业生产,年产量约200t,其中,70%-80%用于制药并出口欧洲,20%-30%用于日本国内的制药和染料。本文系统介绍了:D... 二氨基顺丁烯二腈(DAMN)是一种重要的化工原料,可用于合成治癌剂、微生物培养剂、调味品、药品等。目前,只有日本曹达一家企业生产,年产量约200t,其中,70%-80%用于制药并出口欧洲,20%-30%用于日本国内的制药和染料。本文系统介绍了:DAMN的物化性质、制备方法、用途和市场情况。 展开更多
关键词 二氨基顺丁烯二腈 damn 物化性质 制备 用途 市场分析
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