81 research outputs found
Progress in Non-Destructive Fatigue Crack Detection and Monitoring in Welded Pressure Vessels Subjected to External Pressure Cycling
At the 1980 Review of Progress in Quantitative NDE the authors presented a paper outlining the NDE techniques then under development for fatigue crack detection and monitoring in welded structures (1). The present paper describes the progress made since then in applying the techniques to welded pressure vessels
Linear chaos for the Quick-Thinking-Driver model
The final publication is available at Springer via http://dx.doi.org/10.1007/s00233-015-9704-6In recent years, the topic of car-following has experimented an increased importance in traffic engineering and safety research. This has become a very interesting topic because of the development of driverless cars (Google driverless cars, http://en.wikipedia.org/wiki/Google_driverless_car).Driving models which describe the interaction between adjacent vehicles in the same lane have a big interest in simulation modeling, such as the Quick-Thinking-Driver model. A non-linear version of it can be given using the logistic map, and then chaos appears. We show that an infinite-dimensional version of the linear model presents a chaotic behaviour using the same approach as for studying chaos of death models of cell growth.The authors were supported by a grant from the FPU program of MEC and MEC Project MTM2013-47093-P.Conejero, JA.; Murillo Arcila, M.; Seoane-SepĂșlveda, JB. (2016). 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Micro-simulation model of two-lane freeway vehicles for obtaining traffic flow characteristics including safety condition
Redistributional Preferences and Imposed Institutions
The 1980s saw an exploration of a variety of ways to use ethnography to study scientists. From the sociology of scientific knowledge, to actor-network theory to the ontological turn, science studies scholars increasingly shifted their focus from studying scientists to investigating scientific practices. This allowed them to inquire into what the objects of science are, instead of only inquiring into the people researching them. Following this shift, I have researched what superconductivity is in practice. The answer is: different things in different situations. In different experiments superconductivity is a different thing. However, these different instantiations of superconductivity are not separate versions. Some of the different instantiations need each other to work in practice. Following Annemarie Mol, I suggest that superconductivity is a 'multiple' object: it has more than one instantiation in practice, but it has less than many different versions. We might imagine superconductivity in practice to look like a network of different experiments in which it is given shape. Finally, I draw some conclusions of the 'multiplicity' of scientific objects for objectivity. I suggest that we move away from correctly representing reality, to presenting new ways of knowing and being. Which presentations are desirable depends on the values of an epistemic community
Exploring Takfir, Its Origins and Contemporary Use: The Case of Takfiri Approach in Daeshâs Media
Muslims have been the primary targets of Daeshâs attacks since 2014 in different countries such as Afghanistan, Iraq, and Syria. These attacks were based on its takfiri ideology. As Daesh official media and documents indicate, kufr (unbelief, infidelity) in Daeshâs approach is not limited to non-Muslims (original disbelievers), but Muslims are the most significant parts of kuffar (unbelievers) in its view and defined as incidental disbelievers. Through studying Daeshâs official documents and various Arabic, English, and Persian media productions, in an explanatory research, this article attempts to display Daeshâs takfiri approach toward Muslims and explains its historical and ideological roots, difference with Al-Qaedaâs takfiri approach, different approaches to takfir inside Daesh, main targets of Daeshâs takfir, and the reasons behinds its takfiri view. This article displays that for Daesh, the Muslims are limited only to Sunni Muslims who are accepting and following its approach. Other Sunni and non-Sunni Muslims are thus kuffar. This study also shows that the assertion of takfir has become a method for Daesh to discredit its opponents, such as Shiâa Muslims and other Muslim groups
Feedback control algorithms for the dissipation of traffic waves with autonomous vehicles
International audienceThis article considers the problem of traffic control in which an autonomous vehicle is used to regulate human piloted traffic to dissipate stop and go traffic waves. We first investigate the controllability of well-known microscopic traffic flow models, namely i) the Bando model (also known as the optimal velocity model), ii) the follow-the-leader model, and iii) a combined optimal velocity follow the leader model. Based on the controllability results, we propose three control strategies for an autonomous vehicle to stabilize the other, human-piloted traffic. We subsequently simulate the control effects on the microscopic models of human drivers in numerical experiments to quantify the potential benefits of the controllers. Based on the simulations, finally we conduct a field experiment with 22 human drivers and a fully autonomous-capable vehicle, to assess the feasibility of autonomous vehicle based traffic control on real human piloted traffic. We show that both in simulation and in the field test that an autonomous vehicle is able to dampen waves generated by 22 cars, and that as a consequence, the total fuel consumption of all vehicles is reduced by up to 20%
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