共查询到20条相似文献，搜索用时 203 毫秒
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本文结合作者的试验,综述了近十年来,提高汽油辛烷值的新型添加剂国外进展情况.提出了尽快发展我国新型抗爆震添加剂生产,以适合国内外汽车工业发展以及节约能源的建议. 相似文献
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郭志红 《洛阳工业高等专科学校学报》2003,13(4):18-19
在有色金属加工中，工艺润滑油中添加剂的含量与产品质量密切相关。采用高氯酸催化乙酸酐乙酰化法可准确测定轧铝油中添加剂的浓度，此方法在较低温度下进行，速度快，可满足轧机轧制油添加剂的工业分析。 相似文献
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马志军 《南通职业大学学报》2007,21(2):96-98
对铅酸电池添加剂超微碳粒胶体的配比及稳定性进行了研究,分析了添加剂的作用机理。应用试验表明,该添加剂消除了硫酸盐化现象,可提高铅酸电池容量,延长其使用寿命。 相似文献
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酸性光亮镀锡稳定剂的研究 总被引：2，自引：0，他引：2
刘根厚 《连云港职业大学学报》1995,8(2):73-78,68
实验结果表明，在酸性镀液中加入酒石酸体系添加剂可明显改善镀液稳定性，该添加剂具有抗Sn^2 氧化，抑制Sn^2 ,Sn^4 水解的作用。镀液中加入该添加剂能维持镀液长期稳定，清澈透明；能提高阴极化值，增强镀液的分散能力及深镀能力，获得结果细致、结合力强的银白色光亮镀锡层。 相似文献
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亚麻油中分离不饱和脂肪酸方法的研究 总被引：1，自引：0，他引：1
不饱和脂肪酸在亚麻油中含量很高,其在医药、工业方面有着重要应用,广泛用于保健食品及石油制品添加剂、橡胶、涂料等方面.本文采用低温结晶法,选择最佳工艺条件,得到理想产率的不饱和脂肪酸. 相似文献
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苏丹红是人工合成的一种工业染料,由于其潜在的毒性,不能作为食品添加剂使用．通过分析苏丹红的分类及结构、苏丹红在人体内的代谢及毒性,确定苏丹红的检测分析方法． 相似文献
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本报导了添加剂在天青石还原焙烧中的反应行为；并从试验中寻找出了使用该添加剂的最佳工艺条件。 相似文献
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首先确定了珍珠岩保温粘结砂浆制备的最佳配比,然后对影响砂浆性能的各种添加剂的作用进行了分析,以期为珍珠岩粘结砂浆的工业应用提供一些理论参考. 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