漆器小知识问答

问 :我想知道一些关于漆器方面的知识 ,请问能帮我解答一下吗 ?答 :中国古代漆器源流久远 ,用漆涂在各种器物的表面上所制成的日常器具及工艺品、美术品等 ,一般称为“漆器”。生漆是从漆树割取的天然液汁 ,主要由漆酚、漆酶、树胶质及水分构成。用它作涂料 ,有耐潮、耐高温、耐腐蚀等特殊功能 ,又可以配制出不同色漆 ,光彩照人。在中国 ,从新石器时代起就认识了漆的性能并用以制器。历经商周直至明清 ,中国的漆器工艺不断发展 ,达到了相当高的水平。中国的炝金、描金等工艺品 ,对日本等地都有深远影响。漆器是中国古代在化学工艺及工艺美术…     

节能型小截面隧道窑的研制

纵观我国日用陶瓷生产厂家,已经由90年代初国营大厂一统天下,变为现在中小企业与国营大厂共存的局面.可以预言,随着我国市场经济的发展与完善以及加入WTO,未来中小型日用陶瓷企业将占据巨大的市场优势.     

欧债危机对全球塑料行业影响甚微

虽然西欧国家的许多塑料企业受到了欧债危机的波及．但全球塑料业的信心并未因此受到太大打击。     

通过中介商购买中国产品效果更佳

一直以来,美国人普遍认为在中国制造产品是件比较难的事情,因为距离遥远、又存在语言障碍和知识产权缺乏保护等问题。几乎任何一个人的经验都会告诫你,你不可能将一个投资项目投向一个不知名的企业而有望得到良好的收益。不过,中国廉价的劳动力市场对美国制造商还是有着巨大的吸引力,他们会不顾存在的问题而来中国“冒险”。那么,为了将投资风险降至最低,最好的解决办法是什么呢？     

塑料细杆注射模设计

本文介绍了塑料细杆注射模的设计过程与制造方法。该注射模采用了1模48腔的结构。     

天然橡胶中并用少量顺丁橡胶的表征

在天然橡胶(NR)中并用少量的顺丁橡胶(BR)，可赋予橡胶制品某些特殊的性能。用红外法来剖析此类并用橡胶制品时，只能检出并用了10份以上的BR；而热重法在检验并用5份的BR时，BR的DTG峰就很明显，本文通过试验证明红外法结合热重法可快捷而准确的表征出天然橡胶制品中并用了约10份的BR。     

颗粒负载TiO_2光催化性能的研究

以钛酸正丁酯和自制颗粒为主要原料,采用溶胶-浸渍法制备出负载型纳米TiO2催化剂,对甲基橙模拟废水进行了光催化降解研究。分析并比较了负载与非负载TiO2降解效果的差异及影响因素。结果表明,120 min后负载型TiO2与非负载TiO2对甲基橙的光催化降解率分别达到99.7%和78.1%,第二次使用的降解率则分别达到90.4%和57.3%。     

低含金金红颜料系列研制

通过对Ａｕ－Ｓｉ－Ｓｎ系金红颜料的合成．对影响其呈色的主要因素—金胶粒子的大小和数量进行了探讨．井叙述了控制金胶粒子的大小和数量的方法．通过生产应用试验，验证了该颜料的呈色性能。     

Food composition: a little bit of history

Data on nutrients and other food components are necessary in several sectors, such as nutrition, health, agriculture, trading and marketing. From the 17th century on, the systematic study of food composition started to be established. During the 19th century, there were many advances, such as the clarification of food energy production, the identification of nutrients and their physiologic role. Also, the first food composition tables began to emerge, finishing the century with the publication of Atwater and Wood's "The Chemical Composition of American Food Material" of the United States Department of Agriculture (USDA), in 1896. In the 20th century, the methods of analysis and the elaboration of food composition tables were improved in many countries. In 1984, INFOODS (International Network of Food Data Systems) was created. This network, linked to United Nations University (UNU) and Food and Agriculture Administration (FAO), proposed rules and created tools that brought great advances in food composition tables. Nowadays, the conscious related to food biodiversity has been amplifying the focus of food composition tables and databases. In Brazil, the Brazilian Food Composition Table (TBCA-USP), of the Brazilian Network for Food Composition Data (BRASILFOODS), since its creation in 1998, has been adopting these international patterns and is available on the Internet (http://www.fcf.usp.br/tabela), currently on the version 4.1.     

塑料细杆注射模设计

介绍了塑料细杆注射模的设计过程与制造方法。该注射模采用了1模48腔的结构。     

浅谈化学反应工程教学改革

根据化学反应工程学科的特点及我校教学情况,从教材选择,教学内容及教学方法等方面浅谈该课程的教学改革。     

Dietary docosahexaenoic acid has little effect on peroxisomes in healthy mice

NMRI mice were fed diets supplemented with 0.05, 0.2, or 2% (w/w) docosahexaenoic acid (DHA), a polyunsaturated fatty acid present in fish oil, for 3 d, 3 wk, or 3 mon. The doses of DHA were chosen to supply the mice with concentrations of DHA which approximate those that have been reported to be beneficial to patients with peroxisomal disease. Diets containing 0.05 or 0.2% DHA did not change hepatic, myocardial, and renal catalase (EC 1.11.1.6) activity except for a slight but significant increase (to 120%) in myocardial catalase activity in mice treated with the 0.05% DHA diet for 3 mon. A diet with 2% DHA induced myocardial catalase activity to 150% after both 3 d and 3 wk of administration. In the liver of mice fed this diet for 3 wk, hepatic catalase activity was increased to 140% while no induction of palmitoyl-CoA oxidase (EC 1.3.99.3), urate oxidase (EC 1.7.3.3), andl-α-hydroxyisovalerate oxidase (EC 1.1.3.a) was observed. With the light microscope, no changes in peroxisomal morphology were visually evaluated in catalase stained sections of liver, myocardium, and kidney of mice fed either diet. Our results show that in healthy mice a low dietary DHA dose (<0.2%; this corresponds to a dose prescribed to peroxisomal patients) has no effect on several hepatic peroxisomal H₂O₂-producing enzymes, including the rate-limiting enzyme of the peroxisomal fatty acid β-oxidation. This may indicate that such a DHA dose will not add a strong load on the often disturbed fatty acid metabolism in the liver of patients with peroxisomal disorders.