共查询到20条相似文献，搜索用时 375 毫秒
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聚合氯化铝(PAC)是一种应用很广的无机高分子絮凝剂.介绍了以高岭土为原料制备高效聚合氯化铝混凝剂的方法;研究焙烧温度、焙烧时间以及盐酸浓度、酸浸时间等条件的影响,确定了制备聚合氯化铝混凝剂的条件:高岭土于650~800℃焙烧2.0~2.5 h,常压下100℃时用15%~20%的盐酸浸取2.0~3.0 h. 相似文献
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离子色谱法同时测定矿物质水中无机阴离子研究 总被引：1，自引：0，他引：1
采用离子色谱法分析了不同矿物质水中五种主要无机阴离子（氟离子、氯离子、硫酸根、硝酸根、磷酸根）的含量,探讨了无机阴离子的离子色谱法检测条件。结果表明,使用AS11-HE阴离子分离柱对五种无机阴离子进行分离,利用免试剂离子色谱仪系统,淋洗液全自动发生,选用OH-为淋洗液,最佳流速、柱温和池温分别为1．2mL／min、30℃和35℃,采用梯度洗脱,可在13min内同时分离检测上述五种无机阴离子,5种无机阴离子的分离度可迭5．59-25．88。方法具有良好的线性,相关系数为0．9969-0．9994,检出限为0．06-0．45mg／L。该法具有简便、快速、灵敏、样品无需前处理等优点,可用于市售矿物质水中五种无机阴离子的同时分析。 相似文献
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《绵阳师范学院学报》2017,(8):72-76
为了探究室温条件下Fe(Ⅱ)与赖氨酸、谷氨酸、酪氨酸的固相反应能否发生及反应时间对反应程度的影响,采用X射线衍射表征发现,反应4 h后产物有原料峰的消失以及新衍射峰的出现;用红外光谱表征发现,产物有新的吸收峰生成且形成配位键的N、O原子原有化学键的吸收峰均发生了蓝移;用扫描电镜表征发现,产物颗粒粒径和结构均发生了变化.以上表征结果确定有新物质的生成. 相似文献
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胡刚毅 《连云港职业技术学院学报》2008,21(4)
在论述X射线与特征X射线的产生的基础上,用量子理论分析了连续X射线谱与特征X射线谱产生的机理。结果表明,特征X射线的波长是由阳极靶物质的原子序数决定的;产生特征X射线的条件中必须包含一个临界激发电压。 相似文献
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为了获得高负载、单分散的Pt／DCNTs异质结构,提出一种单步微波加热多元醇的方法．分别利用透射电子显微镜（TEM）和X射线衍射仪（XRD）表征了Pt／DCNT异质结构的形貌及成分．同时样品的拉曼光谱和傅里叶变换红外光谱（FTIR）表明：在微波处理下的双壁碳纳米管表面上有大量的缺陷或功能团产生,而它们的产生是Pt纳米粒子沿着双壁碳纳米管骨架成核与生长的关键因素． 相似文献
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岳桦 《中国科教创新导刊》1998,(8)
油※水※分※离※系※统日本ＮＥＣ东北公司开发出一种过滤器,用以分离水净化处理后排放的废水中的细小油微粒（乳化油）。这种纤维过滤物质具有立体筛孔结构,由聚丙烯和添加的硫化钡颗粒制成。利用油微粒的带电性可将乳化油吸附、团聚而分离。该过滤物质可用在一种密封... 相似文献
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在无催化剂的条件下,采用溶胶凝胶与化学气相沉积相结合的方法,制备出了高产率的片状ZnO纳米结构。并利用扫描电子显微镜、X射线衍射仪、拉曼光谱仪和荧光测试仪对其结构和性质进行了分析。结果表明,所合成的产物为结晶良好的片状纤锌矿ZnO纳米结构,室温光致发光谱显示,该ZnO纳米结构表现为弱的紫外发射峰和强而宽的绿光发射峰。 相似文献
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《甘肃高师学报》2022,(12)
采用湿法工艺对高岭土原土进行改性,制备了黄原酸基高岭土(XK).通过FT-IF、SEM分析对其进行了表征,结果表明XK已成功合成;XK对亚甲基蓝具有很好的吸附效果,其突出的优点是处理后固液分离简便快速.通过单一因素研究得出,最佳实验条件:在25℃,p H=8.09.2、亚甲基蓝初始质量浓度为150mg·L9.2、亚甲基蓝初始质量浓度为150mg·L(-1)、XK的用量为2.5g·L(-1)、XK的用量为2.5g·L(-1)、吸附作用时间为30min的条件下,甲基橙的去除率可达到99.65%,处理后残余甲基橙的浓度为0.5250mg·L(-1)、吸附作用时间为30min的条件下,甲基橙的去除率可达到99.65%,处理后残余甲基橙的浓度为0.5250mg·L(-1),可达标排放. 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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《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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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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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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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
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 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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