共查询到20条相似文献，搜索用时 140 毫秒
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云南古铜镜激光拉曼光谱研究 总被引：2，自引：0，他引：2
本文应用激光拉曼光谱并辅以电子探针技术，对云南禄丰出土的一面有柄铜镜进行研究，发现其主要成分铅、铜、锡合金，其表面的腐蚀产物主要是CuCO3&;#183;Cu(OH)2。实验证明，铅青铜铜镜的防腐能力较别的青铜镜差，铅的腐蚀产物更易流失。 相似文献
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Q345钢与贝氏体耐候钢盐雾腐蚀产物研究 总被引：1，自引：0，他引：1
对Q345钢和两种不同成分的低碳贝氏体耐候钢在5%的NaCl溶液中模拟海洋大气环境进行了盐雾干湿交替腐蚀试验。采用扫描电镜和X射线衍射仪对钢的腐蚀形貌、锈层截面和腐蚀产物进行了观察和分析。结果表明：主要腐蚀产物相同,均为Fe＋3O（OH）、FeO（OH）及Fe3O4,但腐蚀产物的致密程度和锈层厚度明显不同,这主要是由于合金元素含量不同导致的。 相似文献
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Q345钢室内加速腐蚀与大气暴露的相关性研究 总被引：1，自引：0，他引：1
通过实验室的周浸腐蚀试验和自然环境的大气暴露试验,结合腐蚀产物的表面分析,研究了Q345钢在室内模拟大气腐蚀环境中的腐蚀规律和在青岛、江津、琼海的大气腐蚀规律,结果表明:在室内模拟加速腐蚀试验和大气暴露试验中,腐蚀规律均符合公式logP=A+Blogt,腐蚀产物一致,主要是α-FeOOH和γ-FeOOH,室内加速试验结果与户外暴露结果有较好的相关性。 相似文献
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杨登文 《中学生数理化(高中版)》2003,(1):55-57
1 .氧化铁杆菌在污水铸铁管中 ,能促使污水铁管的腐蚀产物氧化成一种沉淀物 ,该沉淀附着在污水铁管内壁生成硬壳状的锈瘤。有人取下锈瘤 ,经分析发现其中的腐蚀产物含有 1.5 %～ 2 .5 %的硫化物 ,1ｇ腐蚀产物中含有 10 0 0条硫酸盐还原菌。请回答下列问题 :( 1)铁管在污水中发生的腐蚀是 (吸氧腐蚀、析氢腐蚀 ) ,电极反应为 ,化学反应方程式是 ,沉淀物是,其颜色是。( 2 )硫酸盐还原菌是地球上最古老的微生物之一 ,这种微生物适宜的生长环境 ,温度为 2 5℃～ 30℃ ,ｐＨ为 7.2～ 7.5 ,除此之外 ,还有。( 3)锈瘤中的硫化物是 (写分子式 )。其… 相似文献
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春秋战国铜镜数量多种类杂,该时期是我国铜镜历史上的第一个辉煌。春秋战国铜镜对后世产生了深远的影响,该时期的铜镜形状和结构奠定了以后铜镜的基础;铜镜组图以及各种花纹也对后世产生了深远的影响,同时铜镜的繁荣也促进了封建经济的发展,也对我国汉语言产生了一定的影响。 相似文献
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王兰兰 《陕西师范大学继续教育学报》2007,24(2):67-70
唐玄宗始以皇帝诞日为全国性诞节,当时王公戚里向玄宗进献铜镜,而唐玄宗回赐四品以上官员铜镜,铜镜成为君臣间沟通感情的媒介。这一现象背后有其特殊的宗教、政治原因,并对此后的寿诞文化产生了深远的影响。 相似文献
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许巡逻 《岳阳职业技术学院学报》2023,(2):76-80
为找到硫酸铵装置设备、管道及厂房腐蚀存在的原因并能有效进行防护,减少设备及管道的泄漏,支吊架的锈蚀,混凝土框架的腐蚀,保证装置设备的安稳运行,本文从硫酸铵生产工艺特点、腐蚀机理入手,通过对装置现场设备、管道进行宏观检测和腐蚀产物XRD的物相分析,发现腐蚀原因主要是大气腐蚀与硫酸铵腐蚀,特从工艺处理、设备管理、在线监测、厂房修复处理方法、防腐材料的选择、混凝土框架设计方面提出对应的防护对策,并已取得较好的效果。 相似文献
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李菲 《郧阳师范高等专科学校学报》2009,29(2):18-23
我国古代青铜文化辉煌灿烂,铜镜铸行源远流长,笔者搜集了整个十堰地区从汉代到明代流行的30余件铜镜资料,以历史发展的顺序,分为五个大的时段,根据铜镜主纹的发展变化,综合分析整个十堰地区馆藏铜镜成果,并阐明本地区几个历史时期铜镜的类型、年代及特点,对本地区铜镜的制作工艺、时代特点、社会影响进行了探索。 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