Beijing University of Technology

About: Beijing University of Technology is a education organization based out in Beijing, Beijing, China. It is known for research contribution in the topics: Microstructure & Computer science. The organization has 31929 authors who have published 31987 publications receiving 352112 citations. The organization is also known as: Běijīng Gōngyè Dàxué & Beijing Polytechnic University.

Free vibration of rotating pretwisted functionally graded composite cylindrical panel reinforced with graphene platelets

Abstract: This paper investigates the free vibrations of the rotating pretwisted functionally graded (FG) composite cylindrical panels reinforced with the graphene platelets (GPLs) by considering the cantilever boundary conditions. The weight fraction of the graphene platelets in each ply may be different, which leads to the layer-wise functionally graded composite cylindrical panels reinforced with the GPLs. The effective Young's modulus is calculated by the modified Halpin-Tsai model. The effective Poisson's ratio and mass density are derived by the rule of the mixture. The strain-displacement relationship is acquired by the Green strain tensor. Based on the first-order shear deformation theory, Chebyshev-Ritz method is used to obtain the natural frequencies of the rotating pretwisted functionally graded composite cylindrical panel reinforced with the GPLs. The natural frequencies are discussed by considering different material and geometry parameters of the rotating pretwisted functionally graded composite cylindrical panel reinforced with the GPLs, such as the GPL distribution pattern, the GPL weight fraction, the geometries of the GPLs, the pretwisted angle, the presetting angle and the rotating speed. Several validations are carried out, the numerical results are in good agreement with the results of the literature and ANSYS.

Sustainable supply chain modeling and analysis: Past debate, present problems and future challenges

Abstract: For the last two decades, the topic of sustainable supply chains has evoked considerable interest from academics and practitioners. Within this context, Resources, Conservation and Recycling (RCR) and its two predecessors (Resources and Conservation, and Conservation and Recycling) have provided a platform for the exchange of technological, economic, institutional and policy aspects to help societies transition toward sustainability. The current article analyses the published research works in the RCR literature within the context of sustainable supply chain modeling by employing a content analysis literature review technique. Using the body of available literature in RCR, the articles on sustainable supply chain are analyzed in terms of the following: (1) publication per year, (2) top-cited papers across time, (3) most productive and influential authors, institutions and countries (4) supply chain related topical themes, (5) research methodologies applied, (6) illustration types and (7) industries addressed. The analysis revealed that the call for incorporating sustainability (i.e., economic, social, and environmental pillars) into supply chain operations has increased in recent years in RCR publications. Finally, the comprehensive findings and interpretations are presented, as well as the primary current trends, future challenges, directions and opportunities.