由polik写于2008/02 闲论Atiyah-Singer指标定理 Nowadays, mathematicians tend to over-abstract things that in fact cannot be further abstracted, which not only dilutes the essence of concepts but also drives away potential students and users, and eventually, if this pathological mood is not cured [ ...阅读全文 ]
John Dolbow Since its introduction in the summer of 1999, the eXtended Finite Element Method (X-FEM) has enjoyed a considerable level of success and popularity from researchers in the computational and applied mechanics communities. In just under a decade, more than five hundred peer-reviewed journ [ ...阅读全文 ]
作者:刘夙 读完罗伯特·温伯格(Robert A. Weinberg)的《细胞叛逆者:癌症的起源》(One Renegade Cell: How Cancer Begins,郭起浩译,上海科学技术出版社,2008年5月),不由得感慨万千。 温伯格是美国著名分子生物学家,他主持的实验室在癌症起源的研究中做出了重大贡献,我认为温伯格完全有资格获得诺贝尔 [ ...阅读全文 ]
Background From fragile wires to structural steel components, metals producers are faced with a myriad of testing challenges. Metals manufacturers producing products such as plate, rebar, sheet metal and wire/cable, must not only meet advertised strength and performance ratings, but also comp [ ...阅读全文 ]