共查询到20条相似文献，搜索用时 62 毫秒
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范闽光 《南宁职业技术学院学报》1999,(2)
本文用热重法考察了三种不同孔道结构的分子筛（ＳＡＰＯ－３４,ＳＡＰＯ－５,ＨＺＳＭ－５）在乙醇转化为低碳烯反应过程中的积炭行为,以及经钾、镁的化合物改质的ＳＡＰＯ－３４分子筛在该反应过程中的抗积炭能力。用氨程序升温脱附法（ＴＰＤ）研究了它们在积炭前后的酸性变化。 相似文献
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ＯＮＴＨＥＣＯＮＶＥＲＧＥＮＣＥＯＦＧＵＭＭＥＬＭＡＰＰＩＮＧＦＯＲＳＴＥＡＤＹ－ＳＴＡＴＥＳＥＭＩＣＯＮＤＵＣＴＯＲＥＱＵＡＴＩＯＮＳＧｕａｎＰｉｎｇ（管平）ＷａｎｇＹｕａｎｍｉｎｇ（王元明）（ＤｅｐａｒｔｍｅｎｔＯｆＭａｔｈｅｍａｔｉｃｓａｎｄＭ... 相似文献
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ＡＮＡＬＹＳＩＳＯＦＴＨＥＦＩＥＬＤＳＳＣＡＴＴＥＲＥＤＦＲＯＭＡＴＷＯ－ＤＩＭＥＮＳＩＯＮＡＬＣＹＬＩＮＤＥＲＩＬＬＵＭＩＮＡＴＥＤＢＹＡＰＯＩＮＴＳＯＵＲＣＥＣｈｅｎｇＣｈｏｎｇｈｕ（程崇虎）ＺｈａｎｇＷｅｎｘｕｎ（章文勋）（ＳｔａｔｅＫｅｙＬａ... 相似文献
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ＡＭＯＤＩＦＩＥＤＣＲＡＮＫ－ＮＩＣＯＬＳＯＮＳＣＨＥＭＥＦＯＲＴＨＥＩＮＩＴＩＡＬ－ＢＯＵＮＤＡＲＹＶＡＬＵＥＰＲＯＢＬＥＭＯＦＳＵＰＥＲＴＨＥＲＭＡＬＥＬＥＣＴＲＯＮＴＲＡＮＳＰＯＲＴＥＱＵＡＴＩＯＮＳｕｎＺｈｉｚｈｏｎｇ（孙志忠）（Ｄｅｐａｒｔ... 相似文献
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ＡＮＯＴＥＯＮＴＨＥＵＮＩＱＵＥＮＥＳＳＴＨＥＯＲＥＭＦＯＲＳＴＥＡＤＹ－ＳＴＡＴＥＳＥＭＩＣＯＮＤＵＣＴＯＲＥＱＵＡＴＩＯＮＳＧｕａｎＰｉｎｇ（管平）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓａｎｄＭｅｃｈａｎｉｃｓ）ＡＮＯＴＥＯＮＴＨＥＵＮ... 相似文献
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稻白叶枯病系统获得性抗性与非诱导部位活性氧及其清除系统的关系 总被引：1，自引：0，他引：1
试验选用水稻品种湘早籼３号（湘３,抗病品种）和浙辐８０２（浙８,感病品种）为材料,至６叶期,分别用稻白叶枯病菌的弱毒株（７５－１）和强毒株（７６－２５）在第５叶剪叶接种诱导;测定接种后１２、２４、４８、７２ｈ第６叶的ＳＯＤ活性、ＰＯＤ活性、ＭＤＡ含量及超氧阴离子产生速率的动态变化;并于第６ｄ在第６叶挑战接种７６－２５,挑战接种后１５ｄ测量病班长度。结果表明,２诱导因子均诱导２品种产生了系统获得性抗性（ＳＡＲ）,诱导效果浙８好于湘３,７６－２５好于７５－１。诱导处理后,２品种上位叶中ＳＯＤ活性及Ｏ·２产生速率有所降低,ＰＯＤ活性升高,ＭＤＡ含量变化不明显,这些变化从诱导后２４人开始,４８ｈ～７２ｈ的变化更大。以上结果表明诱导产生的ＳＡＲ与非诱导部位的组织中活性氧代谢密切相关 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
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The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献