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 共查询到19条相似文献,搜索用时 281 毫秒
1.
将磷元素拟人化,通过生动的语言,讲述了她在生命体内的作用以及在人类生活中的应用,让磷元素的生理功能以及应用更简单易懂,使读者体会到磷元素独特的美。  相似文献   

2.
阻燃剂在人类的生活和生产中都发挥着重要作用。本文以模拟火灾为背景,通过拟人化的手法,介绍常见阻燃剂的性质及应用,让读者以生动活泼的方式了解常见的阻燃剂。  相似文献   

3.
运用拟人化的手法,生动形象地介绍了维生素B族大家庭中每位成员的性质、特点以及其与疾病的关系,旨在让读者在趣味阅读中了解有关维生素B族的相关知识。  相似文献   

4.
硫的自述     
硫,无论是元素还是化合物,都在人类的生活与生产中起着至关重要的作用。本文将硫元素拟人化,介绍了其发展史,在地球上的分布、性质以及在生活中的应用,让读者在趣味阅读中了解硫及其化合物。  相似文献   

5.
硒在我们的日常生活和生命活动中发挥着无法替代的重要作用,本文将采取拟人化的手法,采用简历的形式对硒的物理性质、化学性质以及应用等进行介绍。让读者们用更为生动活泼的方式来获取知识。  相似文献   

6.
钙及其化合物在生产和生活中有着重要的应用。自钙第一次被化学家发现并在实验室合成至今,钙一直伴随在人类左右。而本文将钙拟人化,以"元素世界盛典故事"的形式,回顾了钙的发现史和应用。  相似文献   

7.
自铝第一次被化学家发现并在实验室制备至今,铝一直与人类如影随形,铝及其化合物在生产和生活中有着重要的应用。本文将铝拟人化,以"诊疗"的形式,采用对话体,回顾了铝的发现史和应用史。  相似文献   

8.
铜的舞台     
铜及其化合物在我们的生产生活中不可或缺。本文将元素周期表比作联合国,采用话剧的形式,借助生动的情节和拟人化的对话,主要介绍铜及其化合物的性质和应用。  相似文献   

9.
氟生记     
氟及其化合物在生产和生活中有着重要的应用。自氟第一次被化学家发现并在实验室中制备至今,氟一直和人们如影随形,本文将氟拟人化,以传记的形式,采用传记体,回顾了氟的发展史和应用史。  相似文献   

10.
食品防腐剂的出现极大地延长了食品保存的时间,在现代食品工业中占有重要地位。随着生活水平的提高,人们越来越关心食品安全问题,但仍然存在不少误区。本文以拟人化的手法,介绍了几类食品防腐剂的作用原理和利弊,旨在向大众普及科学的防腐剂知识。  相似文献   

11.
咪草烟分子印迹聚合物的制备及其选择性吸附性能的研究   总被引:1,自引:0,他引:1  
以丙烯酸为聚合单体,TMPTA为交联剂,AIBN为引发剂,咪草烟为模板分子,采用在低温光聚合的方法,制备了对咪草烟分子具有选择性识别能力的分子印迹聚合物.通过IR和HPLC表征,咪草烟分子印迹聚合物对咪草烟分子具有良好的识别作用.  相似文献   

12.
《印度化学会志》2023,100(1):100818
In the present paper, the heat generating and/or absorption as well as thermo-diffusion on the unsteady free convection MHD gyrating flow of radiation and chemical reactive second grade fluid past an unbounded perpendicular plate during absorbent medium have been discussed. Here, it is assumed that, the confining plate has the ramped wall temperature with ramped surface concentration and isothermal temperature with ramped surface concentration. The analytical solutions for the governing equations are found by utilization of Laplace transformation methodology. The velocity, temperature and concentration profiles are analyzed with quite few figures. It is determined that, velocity, temperature and concentration distribution sketches in case of ramped temperature as well as ramped surface concentration are not as much of as those of isothermal temperature as well as ramped surface concentration. In addition to the idioms of skin friction, Nusselt number as well as Sherwood number are achieved and characterized numerically with tabular format.  相似文献   

13.
The concepts article describes enabling techniques (solid-phase assisted synthesis, new reactor design, microwave irradiation and new solvents) in organic chemistry and emphasizes the combination of several of them for creating new synthetic technology platforms. Particular focus is put on the combination of immobilized catalysts as well as biocatalysts with continuous flow processes. In this context, the PASSflow continuous flow technique fulfils both chemical as well as chemical engineering requirements. It combines reactor design with optimized, monolithic solid phases as well as reversible immobilization techniques for performing small as well as large scale synthesis with heterogenized catalysts under continuous flow conditions.  相似文献   

14.
陈双  陈巧平  郑曦  陈晓  陈震 《应用化学》2010,27(11):1301-1305
以Cr3+交联羧甲基纤维素钠(CMC)作为阳膜层,戊二醛改性壳聚糖(CS)作为阴膜层,纳米TiO2光催化剂作为双极膜的中间层,在TiO2上涂布光敏剂八羟基喹啉(Oxine)以增强其光催化解离水的性能,制备了三明治式的双极膜(mCMC/TiO2-Oxine/mCS BPM)。 该双极膜在紫外光照射下,具有高的水解离效率,优良的亲水性能,双极膜阻抗小,工作电压低,当工作电流密度达0.12 A/cm2时,电槽工作电压小于5.0 V。  相似文献   

15.
The utility of diphosphorous tetraiodide as a new, mild, condensing agent for synthesis of oxadiazole is described. These data indicate the simple dehydration of oximes to 1,2,5-oxadiazole as well as the rearrangements of oximes to normal Beckmann product 1,2,4-oxadiazole. However, mono-oxime of benzil undergoes abnormal Beckman rearrangement to benzaldehyde as major product. The described method is simple and important for the synthesis of the oxadiazoles as well as for nitriles.  相似文献   

16.
Enzyme-based biocatalysis is emerging as an advanced technique to develop green processes that help to maintain the sustainability of the environment. The bioremediation of toxic organic pollutants and waste to bioenergy production using enzymes as biocatalysts is rapidly growing due to its eco-friendly and sustainable nature. Additionally, a range of microbial species that typically grow on organic wastes can be used to produce these enzymes in an efficient manner. This is seen as a potential strategy for the development of cost-effective manufacturing for a number of biotechnological applications. The present study discusses biocatalysis as a promising and sustainable method toward the bioremediation of hazardous organic pollutants as well as for bioenergy production, based on the immense potential of enzymes as biocatalysts. Emphasis has been placed on evaluating the critical elements that can enhance the production of enzymes used as biocatalysts, as well as their functional effectiveness and stability.  相似文献   

17.
18.
Volatile organic compounds serve in nature as semiochemicals for communication between species, and are often used as flavors and fragrances in our everyday life. The quite limited longevity of olfactive perception has led to the development of pro-perfumes or pro-fragrances--ideally nonvolatile and odorless fragrance precursors which release the active volatiles by bond cleavage. Only a limited amount of reaction conditions, such as hydrolysis, temperature changes, as well as the action of light, oxygen, enzymes, or microorganisms, can be used to liberate the many different chemical functionalities. This Review describes the controlled chemical release of fragrances and discusses additional challenges such as precursor stability during product storage as well as some aspects concerning toxicity and biodegradability. As the same systems can be applied in different areas of research, the scope of this Review covers fragrance delivery as well as the controlled release of volatiles in general.  相似文献   

19.
评述了近年来以环己烯为底物,双氧水为氧源,分别采用钨酸盐、钨酸、杂多酸及杂多酸盐、功能化分子筛和负载离子液体等为催化剂催化合成己二酸的研究进展.  相似文献   

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