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Influence of the microstructure on effective mechanical properties of carbon nanotube composites
Drucker, Sven,Wilmers, Jana,Bargmann, Swantje Techno-Press 2017 Coupled systems mechanics Vol.6 No.1
Despite the exceptional mechanical properties of individual carbon nanotubes (CNTs), the effective properties of CNT-reinforced composites remain below expectations. The composite's microstructure has been identified as a key factor in explaining this discrepancy. In this contribution, a method for generating representative volume elements of aligned CNT sheets is presented. The model captures material characteristics such as random waviness and entanglement of individual nanotubes. Thus it allows studying microstructural effects on the composite's effective properties. Simulations investigating the strengthening effect of the application of a pre-stretch on the CNTs are carried out and found to be in very good agreement with experimental values. They highlight the importance of the nanotube's waviness and entanglement for the mechanical behavior of the composite. The presented representative volume elements are the first to accurately capture the waviness and entanglement of CNT sheets for realistically high volume fractions.
Drucker, Peter F 성균관대학교 경상대학 학생회 1970 經商論集 Vol.21 No.1
오늘날 우리들은 닥쳐올 2,000년대에 대해서 많은 책을 읽고 생각도 하게 된다. 과거의 경험에 비추어 보건데 우리의 추측은 별로 벗어나지 않는다. 그러나 오늘날 이미 명백한 일이 하나 있는데 2,000년대에 모든 의사결정을 하고 무엇보다도 우리들의 경영과 경제를 맡을 사람들은 자유세계의 경영대학에서 앞으로 2~3년 내에 배출될 젊은이들이라는 것이다. 즉 이들은 현재 기업체가 젊은 사원으로서 혹은 경영견습생으로서 고용하고 있는 젊은이들이라는 것이다. 2,000년대에 기획을 담당할 이들은 현재에 앞으로 다가올 2,000년대의 실천사항을 배우고 있다. 물론 그들이 임무를 수행하는데 무엇이 가장 필요한가에 대해서는 의견들이 분분하다. 그러나 내일의 경영지도자가 절실히 필요하다는 점에서 이 책은 토론을 통하여 몇가지 실마리를 던져 주고 있다. 계획결정과 지식과 능력이라는 중요한 요소를 발견할 수 있는 것이다. 이 책의 '내일의 경영지도자 양성'이라는 항목을 읽어보면 그 중요성을 새삼스레 인식할 것이다.
Bacterial Aggregates Formation After Addition of Glucose in Lake Baikal Water
Spiglazov Lev P.,Drucker Valentin V.,Ahn Tae Seok The Microbiological Society of Korea 2004 The journal of microbiology Vol.42 No.4
For determining the process of bacterial aggregation, glucose was added into water from Lake Baikal which had been stored for seven months. In the presence of a higher concentration of glucose, the abundance of single bacteria and aggregates were higher, but the biovolumes of both bacteria were similar. Theses results mean that both free-living and aggregated bacteria have similar maximum sizes and that aggregates are forming with available organic materials. With available organic materials, the biovolume of aggregates becomes larger.
Bacterial Aggregates Formation After Addition of Glucose in Lake Baikal Water
Lev P. Spiglazov,Valentin V. Drucker,Tae Seok Ahn 한국미생물학회 2004 The journal of microbiology Vol.42 No.4
For determining the process of bacterial aggregation, glucose was added into water from Lake Baikal which had been stored for seven months. In the presence of a higher concentration of glucose, the abundance of single bacteria and aggregates were higher, but the biovolumes of both bacteria were similar. Theses results mean that both free-living and aggregated bacteria have similar maximum sizes and that aggregates are forming with available organic materials. With available organic materials, the biovolume of aggregates becomes larger.