PDMS microchannel fabrication technique based on microwire-molding

Micro-flow channel is basic functional component of microfluidic chip, and every step-forward of its construction technique has been receiving concern all over the world. This article presents a notcomplicated but flexible method for fabrication of micro-flow channels. This method mainly utilizes the conventional molding capability of polydimethylsiloxane （PDMS） and widespread commercial microwires as templates. We have fabricated out some conventional types of microchannels with different topological shapes, as examples for the demonstration of this flexible fabrication route which was not dependent on the stringent demands of photolithographical or microelectromechanical system （MEMS） techniques. The smooth surface, high-intensity, and high flexibility of the wires made it possible to create many types of topological structures of the two-dimensional or three-dimensional microchannel or channel array. The geometric shape of the cross-section of thus forming microchannel in PDMS was the negative of that of embedded-in microwire, in high-fidelity if suitable measures were taken. Moreover, such a microchannel fabrication process can easily integrate the conductivity and low resistivity of the metal wire to create micro-flow devices that are suitable for the electromagnetic control of liquid or the temperature regulation in the microchanneh Furthermore some preliminary optical analysis was provided for the observation of thus forming rounded microchannei. Based on this molding strategy, we even made some prototypes for functional microflow application, such as microsolenoids chip and temperature control gadgets. And an experiment of forming a droplet in the cross channel further confirmed the feasibility and applicability of this flexible microchannel forming technique.     

中国印刷术在越南的传播及其影响

中国与越南是两个山水相连的邻邦,两国之间有着悠久的交往历史。印刷术是中国古代四大发明之一。作为中国传统文化的重要组成部分,印刷术的传播在两国的交往历史中扮演着重要角色,为中越两国传统友谊的构建和发展起到了重要作用。     

文明的传递

印刷术的出现,标志着人类文明进入了一个新的阶段。虽然这项伟大的发明经由古老的中国传向世界各地经历了一个漫长的过程,但有幸的是,这个文明的传递过程,自印刷术诞生那天起就从未中断过。     

什么比论文数量世界第二更重要?

3月28日,英国皇家学会的报告说,中国在国际科学刊物上发表的论文总数已跃居全球第二位,并预计到2013年,中国可能超过美国成为全球发表科研论文最多的国家。在中国话题热的今天,这个消息当然引发了媒体的注意。BBC惊呼,两年内中国将在科学领域超过美国,发明了指南针、火药、造纸术和印刷术的这个国家正准备做一次全球性卷土重     

浅谈佛教典籍与雕版印刷术

为世人称道的中国古代四大发明之一———印刷术 ,不仅成为我们人类传播与保存知识文化的一种重要手段 ,而且对于促进世界文化的发展和交流产生了较大作用及深远的影响。提到印刷术 ,我们不能不把佛教典籍与之联系起来 ,因为佛典与雕版印刷的因缘很深。据唐冯贽《云仙散录》引《僧园逸录》 :“玄以回锋纸印普贤像 ,施于四方 ,每岁五驮无馀。”故而得知 ,最初在唐贞观三年出现的早期印刷品为佛教宣传品。不仅如此 ,现存世界上最早的印刷品是八世纪初(约 70 4年— 75 1年 )唐印本 ,《无垢净光大罗尼经》 ;最早的印刷书签是《契丹藏》(《辽…