1,412 research outputs found
Nonlinear buckling of microfabricated thin annular plates
No full textAnnular plate structures are commonly used in MEMS devices, particularly in pumps and valves. In MEMS applications, large nonlinear deflections are routinely achieved. In this paper, the nonlinear buckling of a thin elastic annular plate under a compressive radial force acting in the plane of the plate is considered. Although the critical loads at which buckling starts can be determined by solving a linear eigenvalue problem, the large deflection behavior of a buckled plate beyond the critical loads can be described by the nonlinear theory proposed by von Kármán. The buckling loads of the annular plate for various boundary conditions are calculated and the post-buckling behaviors are examined. Interestingly, the buckling of an annular plate exhibits a supercritical pitchfork bifurcation. Thus, the post-buckling behavior is stable and will not collapse catastrophically. Several design implications for microfabricated structures, in particular microvalves, are also given
Large deflection analysis of a pre-stressed annular plate with a rigid boss under axisymmetric loading
No full textThe large deflection analysis of a pre-stressed annular plate with a central rigid boss subjected to axisymmetric loading is presented. The factors affecting the transition from plate behaviour to membrane behaviour (e.g. thickness, in-plane tension and material properties) are studied. The effect of boss size and pre-tension on the effective stiffness of the plate are investigated. The extent of the bending boundary layers at the edges of the plate are quantified. All results are presented in non-dimensional form. The design implications for microelectromechanical system components are assessed
Taiwan’s International Tourism: A Time Series Analysis with Calendar Effects and Joint Outlier Adjustments
No full textDifferential regulation of interleukin-8 gene transcription by death receptor 3 (DR3) and type I TNF receptor (TNFRI).
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A model for pseudo-Dirac neutrinos: leptogenesis and ultra-high energy neutrinos
No full textWe propose a model where sterile neutrinos are introduced to make light neutrinos to be pseudo-Dirac particles. It is shown how tiny mass splitting necessary for realizing pseudo-Dirac neutrinos can be achieved. Within the model, we show how leptogenesis can be successfully generated. Motivated by the recent observation of very high energy neutrino events at IceCube, we study a possibility to observe the effects of the pseudo-Dirac property of neutrinos by performing astronomical-scale baseline experiments to uncover the oscillation effects of very tiny mass splitting. We also discuss future prospect to observe the effects of the pseudo-Dirac property of neutrinos at high energy neutrino experiments. © 2016, The Author(s)3611Nsciescopu
Estimating cardiovascular age of civil flying personnel by means of heart rate and blood pressure variability analysis (In Chinese)
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Unravelling Interdependence: Coordinating Public-Private Service Networks
No full textGovernments aim to improve service delivery towards citizens and businesses. One of the main trends in this area is that organisations are increasingly trying to integrate service delivery by using information and communication technology (ICT). Service integration is necessary as individual service offerings are often just a part of a bigger process. This overall process does not stop at the boundaries of individual organisations, or at the boundary between the public and the private sector. Therefore, in order to improve service delivery, the service providers have to collaborate and integrate their services across organisational boundaries. The challenges that these collaborations face are varied, including heterogeneous organisations, a variety of processes, and fragmented information systems. How can we deal with these challenges to realise integrated service delivery? It is this question that is the background of this dissertation. It is addressed by exploring the interdependence in integrated service delivery, provided by networks of public and private organisations. Ultimately, the dissertation improves the understanding of the coordination of such public-private service networks.Infrastructure Systems & ServicesTechnology, Policy and Managemen
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