共查询到20条相似文献，搜索用时 93 毫秒
1.
《实验室研究与探索》2019,(10):50-52
设计了二硫化钼纳米片的合成、表征及光催化性能的研究型实验。以钼酸钠和硫脲为原料,硅钨酸、四丁基溴化铵、草酸为添加剂,采用水热法制备了光催化剂二硫化钼纳米片。运用扫描电镜、X射线衍射仪等方法对制备的样品进行了表征和分析,通过光催化性能测试研究制备条件对催化性能的影响。设计实验将材料合成技术、材料表征、催化性能测试等专业知识贯穿起来,培养材料化学专业学生的科研探索精神与创新思维,促进学生专业能力的提高。 相似文献
2.
3.
《实验技术与管理》2020,(4)
设计了g-C_3N_4基纳米复合物的制备、表征及其光催化性能分析的科学研究型综合实验。通过简单的一步煅烧法合成了α-Fe_2O_3/g-C_3N_4纳米复合光催化剂;采用X射线衍射、透射电镜、紫外-可见漫反射光谱等对其结构和性质进行了分析和表征;在模拟可见光照射下,通过测试模型污染物罗丹明B(Rhodamine-B,RhB)的降解程度来考察其光催化性能。实验设计简单易行,涵盖了材料的合成、表征及光催化性能评价等多个知识点,便于学生了解光催化领域的学术前沿,掌握纳米复合材料的制备方法,熟悉大型仪器的使用步骤,同时有助于增强学生的科研创新意识,培养学生的综合实践能力。 相似文献
4.
5.
《实验室研究与探索》2020,(5):17-20
基于伊利石/纳米TiO_2光催化剂的制备、光催化降解染料性能以及产物结构的表征,设计了一个综合研究性实验。该实验考察了反应体系的温度、时间及纳米TiO_2负载量对降解亚甲基蓝溶液(MB)效果的影响。运用了X-射线衍射(XRD)、X射线荧光衍射(XRF)、扫描电镜(SEM)对原料及反应产物进行了表征;利用紫外-可见分光光度计及光催化反应仪评估了其光催化降解的性能。实践证明,该综合实验对提高学生的学习兴趣,培养学生的创新思维,锻炼学生的综合实践能力有较大的积极作用。 相似文献
6.
基于提升本科生创新实践能力的培养目标,设计综合实验"钼酸银/溴化银/银纳米复合材料的制备及催化性能研究"。实验通过水热法合成钼酸银球状晶,根据溶度积常数的差异实现钼酸银-溴化银的原位复合,再引入感光技术在二元复合材料表面进一步沉积纳米银颗粒,利用单质银的等离子体共振效应显著提高材料的光催化性质。该综合实验将复合材料制备、性能研究和实际应用有机结合,通过模拟科研全流程,改革教学方式方法,激发学生的学习兴趣和研究热情,拓展学生的科学视野,培养学生的创新思维和科研素养,增强学生解决实际问题的能力,从而有效提高教学质量。 相似文献
7.
纳米二氧化钛光催化剂的综合性实验设计 总被引：1，自引：0，他引：1
光催化及纳米二氧化钛光催化剂研究为当今重要的研究课题之一,为了让化学类本科生了解和掌握光催化原理和催化剂的制备,在大量研究工作的基础上,我们设计了关于纳米二氧化钛光催化剂的制备及其性能研究的实验,包括溶胶-凝胶法制备纳米锐钛矿型二氧化钛光催化剂,甲基橙的光催化降解过程等实验内容。 相似文献
8.
9.
《赤峰学院学报(自然科学版)》2020,(1)
采用水热法制备了不同形貌和结构的TiO_2纳米材料.通过控制溶剂中二甘醇和水的比例以及制备温度对TiO_2的形貌结构进行了调控.通过扫描电子显微镜和X射线衍射仪对样品的形貌和结构进行了表征.通过对亚甲基蓝的光催化降解研究其光催化性能.结果表明,二甘醇和水比例为1:1.7,温度为200℃时所制备的TiO_2分级结构具有最佳的光催化活性.该实验涉及了文献阅读、实验方案制定以及结果分析等环节,培养了学生的动手、分析、应用以及创新等能力. 相似文献
10.
11.
罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
12.
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
13.
Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
14.
Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
15.
16.
17.
《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
18.
陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
19.
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
20.
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