73 research outputs found
Investigations on nucleophilic layers made with a novel plasma jet technique
In this work a novel plasma jet technique is used for the deposition of nucleophilic films based on (3-aminopropyl)trimethoxysilane at atmospheric pressure. Film deposition was varied with regard to duty cycles and working distance. Spectral ellipsometry and chemical derivatization with 4-(trifluoromethyl)benzaldehyde using ATR- FTIR spectroscopy measurements were used to characterize the films. It was found that the layer thickness and the film composition are mainly influenced by the duty cycle
Rail-freight crew scheduling with a genetic algorithm
peer reviewedThis article presents a novel genetic algorithm designed for the solution
of the Crew Scheduling Problem (CSP) in the rail-freight industry. CSP is the task
of assigning drivers to a sequence of train trips while ensuring that no driver’s
schedule exceeds the permitted working hours, that each driver starts and finishes
their day’s work at the same location, and that no train routes are left without a
driver. Real-life CSPs are extremely complex due to the large number of trips,
opportunities to use other means of transportation, and numerous government
regulations and trade union agreements. CSP is usually modelled as a set-covering
problem and solved with linear programming methods. However, the sheer
volume of data makes the application of conventional techniques computationally
expensive, while existing genetic algorithms often struggle to handle the large
number of constraints. A genetic algorithm is presented that overcomes these
challenges by using an indirect chromosome representation and decoding
procedure. Experiments using real schedules on the UK national rail network
show that the algorithm provides an effective solution within a faster timeframe
than alternative approaches
Thermo-Mechanical Treatment Effects on Stress Relaxation and Hydrogen Embrittlement of Cold-Drawn Eutectoid Steels
The effects of the temperature and stretching levels used in the stress-relieving treatment of cold-drawn eutectoid steel wires are evaluated with the aim of improving the stress relaxation behavior and the resistance to hydrogen embrittlement. Five industrial treatments are studied, combining three temperatures (330, 400, and 460 °C) and three stretching levels (38, 50 and 64% of the rupture load). The change of the residual stress produced by the treatments is taken into consideration to account for the results. Surface residual stresses allow us to explain the time to failure in standard hydrogen embrittlement test
International Geomagnetic Reference Field: the thirteenth generation
In December 2019, the International Association of Geomagnetism and Aeronomy (IAGA) Division V Working Group (V-MOD) adopted the thirteenth generation of the International Geomagnetic Reference Field (IGRF). This IGRF updates the previous generation with a definitive main field model for epoch 2015.0, a main field model for epoch 2020.0, and a predictive linear secular variation for 2020.0 to 2025.0. This letter provides the equations defining the IGRF, the spherical harmonic coefficients for this thirteenth generation model, maps of magnetic declination, inclination and total field intensity for the epoch 2020.0, and maps of their predicted rate of change for the 2020.0 to 2025.0 time period
THE EFFECT OF FUSION ANOMALY "HORSESHOE KIDNEY" IN THE PERCUTANEOUS TREATMENT OF KIDNEY STONE DISEASE
WOS: 000283864901016
Malignant mesothelioma in southern Anatolia: A preliminary study in 50 cases
WOS: 000071793401044
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