温度对磷酸钛介孔材料的制备及电化学性能的影响

采用溶胶凝胶模板结合煅烧的方法,合成得到磷酸钛介孔材料,研究了煅烧温度对磷酸钛介孔材料的介孔结构及其电化学性能的影响;分别采用了X-射线粉末晶体衍射技术(XRD)、低温N2吸脱附技术、高分辨透射电子显微技术(HRTEM)及元素分析等方法对样品进行了表征. 实验结果表明,高温煅烧对材料的介孔结构不利,并使材料晶体化;充放电测试结果表明,在500℃下煅烧得到的材料表现出较好的电化学性能,在150mA/g下充放电,材料首次放电容量高达94mAh/g,而650℃时的材料只有64mAh/g.     

NENU-5衍生Cu-MoOx@C纳米材料高效催化氨硼烷水解释氢

以NENU-5为牺牲模板,在惰性气氛保护下高温碳化处理获得多孔碳包裹Cu-MoO_x纳米颗粒的复合材料。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)等表征手段对材料的形貌、结构和组成进行了详细表征。将所得材料应用于催化氨硼烷水解释氢反应中,探究不同Mo掺入量、煅烧温度、反应温度对释氢速率的影响。研究结果表明,Cu-MoO_x@C-0.9-750的催化性能最佳,释氢速率高达1 240 mL/(g·min.),显著优于Cu@C-750纳米材料,这表明Cu与MoO_x的协同作用在促进反应效率方面起到了关键作用。     

开放式化学实验设计——多孔氮掺杂石墨烯的制备与储能性质研究

本文设计了一个开放式化学实验:利用尿素和葡萄糖为原料,表面活性剂P123为造孔剂,通过两步热处理法制得多孔氮掺杂石墨烯,利用扫描电镜、X射线衍射、红外光谱和拉曼光谱等表征手段对产物进行组成和结构的表征,同时利用电化学表征技术对材料的储能性质进行研究。本实验可以使学生了解碳材料的常规合成方法、掌握化学产物的常用表征手段和电化学储能性质的研究方法等。本实验结合科技前沿领域的研究热点,并综合有机化学与分析化学等学科的基础知识,有利于增强学生的实验技能并培养学生的创新能力。     

超临界CO2做发泡剂制备多孔尼龙66膜的研究

超临界CO2做发泡剂制备多孔膜尼龙66,通过X射线衍射、扫描电镜和水通量的方法对膜结晶度、孔形态和水通量进行了表征.超临界CO2的作用促使膜结晶度提高,得到胞腔状开孔结构膜.     

高分子网络法制备In2O3超细粉的工艺研究

以硝酸铟为起始原料, 利用高分子网络法合成纯的单相In2O3纳米晶. 采用X射线粉末衍射(XRD)和透射电镜(TEM)等检测手段对所得粉体的组成、大小和微观形貌进行了表征和分析. 同时, 根据XRD衍射图谱结果进一步讨论了不同原料质量浓度、煅烧温度和煅烧时间对产物粒径的影响. 实验结果表明所得晶粒晶相单一, 粒度均匀并且可以选择适宜的条件制备所需粒径的纳米氧化物.     

晶化温度对合成二氧化锆介孔分子筛介观结构的影响

采用有机小分子三乙醇胺同时作为水解抑制剂和模板剂,丙醇锆作为前驱物,通过溶凝胶工艺合成了二氧化锆介孔分子筛.利用X射线粉末衍射、低温N2吸-脱附法等表征手段,考察了晶化温度对二氧化锆介孔分子筛介观结构的影响.     

索氏抽提对HMS合成的影响

以溶胶凝胶法室温下合成了HMS分子筛原粉(DDA-HMS),考察了索氏抽提法脱膜过程中的抽提条件对HMS中孔结构及有序度的影响,X射线衍射(XRD)、傅立叶红外(FTIR)、扫描电镜(TEM)、X射线光电子能谱(XPS)及失重与差热(TG-DTA)分析表明:不同的抽提溶剂和抽提时间对HMS材料的结构具有不同程度的影响,并首次发现以丙酮抽提DDA合成的HMS具有最稳定的中孔结构和较高的中孔有序度.     

滇蔗茅为生物模板的Co掺杂SiO_2材料的表征及催化性能

用X射线衍射、N2-物理吸附和解吸附、紫外-可见分光光度计、傅里叶红外光谱仪和扫描电镜对滇蔗茅为生物模板剂合成Co掺杂的介孔SiO2材料进行表征。X射线衍射、N2-物理吸附和解吸附研究结果表明该材料为介孔材料且氧化钴高分散于介孔材料的表面。紫外-可见分光光谱表明钴离子以Co2+和Co3+的形态存在。将其催化剂应用于环己烷的催化氧化,实验结果表明催化剂能高效催化环己烷转化为环己酮。     

光的传播与相互作用

通过对比光在相同尺寸不同材料上的衍射图样,发现光的衍射图样除了与孔的线度有关外,还与材料等其他因素有关,说明光的传播与物质的相互作用的关系,并预言X射线衍射的新现象。     

掠入射X射线散射方法与应用

描述了掠入射X射线散射的基本方法,包括掠入射X射线衍射、掠入射X射线反射和掠入射X射线漫散射方法。还对实验室进行掠入射X射线散射的实验几何进行了描述,并给出X射线掠入射方法在纳米薄膜材料研究中的应用。     

汉字倒说

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。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

钱生钱!

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     

只要努力,不要后悔

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.     

Inequalities for inscribed simplexes

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.     

浅谈移民问题

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.     

微薄的薪水,高尚的情操

现在,我们可以没有面包,没有钱,没有房子,没有车子……但我们唯独不能丢失的是高尚的情操,笃定的信念,还有,满满的希望!     

Virtual reality approach for 3D large model browsing on web site

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.     

An Analysis of Individualism in the Declaration of Independence

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.     

Sister Carrie, an Adherent of Desires

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.