炭水化物水酸基の相対的反応性について (そのII) : ペントースの選択的エステル化反応を中心に

Landfill site of Tangier City is non-engineered low lying open dump. It has neither bottom liner nor leachate collection and treatment system. Therefore, all the leachate generated finds its paths into the surrounding environment Leachate samples of landfill site were collected and analyzed to estimate its pollution potential. The analyzed samples contained a high concentration of organic and inorganic compounds, beyond the permissible limits

Petri Nets Validation of Markovian Models of Emergency Department Arrivals

International audienceModeling of hospital’s Emergency Departments (ED) is vital for optimisation of health services offered to patients that shows up at an ED requiring treatments with different level of emergency. In this paper we present a modeling study whose contribution is twofold: first, based on a dataset relative to the ED of an Italian hospital, we derive different kinds of Markovian models capable to reproduce, at different extents, the statistical character of dataset arrivals; second, we validate the derived arrivals model by interfacing it with a Petri net model of the services an ED patient undergoes. The empirical assessment of a few key performance indicators allowed us to validate some of the derived arrival process model, thus confirming that they can be used for predicting the performance of an ED

General decay of solutions of a nonlinear Timoshenko system with a boundary control of memory type

In this paper, we consider a nonlinear Timoshenko system, in a bounded domain, where the memory-type damping is acting on a part of the boundary. We establish a general decay result, from which the usual exponential and polynomial decay rates are only special cases. Our work allows certain relaxation functions which are not necessarily of exponential or polynomial decay and, therefore, generalizes and improves earlier results in the literature

High Power Diode Laser (HPDL) surface hardening of low carbon steel: Fatigue life improvement analysis

In the present investigation, a high-power diode laser was applied to improve the fatigue life of AISI 1040 steel components. The interaction between the laser radiation and the steel surface was studied, and the effectiveness of the laser treatment was analysed by fatigue testing. First, the importance of each of the following laser operational parameters was assessed: power, scan speed, focus and number of passes. Second, rotating bending fatigue tests were performed to investigate the effects of laser treatment and the influences of the laser operating parameters on the fatigue endurance of the components. Wohler curves, determined from an analysis of the experimental results, showed that laser treatment can significantly increase the fatigue life of irradiated components, thus revealing the suitability of this method for industrial applications