Vergleichende Feuchtebestimmung an Bohrkernen und geschnittenen Holzproben nach DIN 52 183

Ohne Zusammenfassung     

The influence of crack length on fatigue crack growth in deep sharp notches

The fatigue crack growth rateda/dN of short cracks and the transition to long crack behavior were investigated for ARMCO-iron. Deep notched specimens with very small notch radius (between 1.5 and 4 μm) were used. The experiments were performed with constant stress intensity ranges for various stress ratios; the fatigue crack growth rate was measured as a function of the crack length. The results permit a discussion of the mechanisms responsible for the different behavior of “short” and “long” cracks.     

Managing money flow to safeguard your practice

Whether payments for service come in the form of patient cash or checks, or insurer payments, it is paramount that a doctor implement a strong accounting system to disclose all daily financial transactions. It is also essential that a strong audit trail be part of this accounting system. By taking a few minutes at the end of each day to do the necessary review, dentists protect their income and provide one of the best protections an owner can have against embezzlement. Let the staff know you are on top of the books!     

Some physical studies on thexBeO(1 −x)V2O5 system

The results of X-ray analysis, electron microscope studies, nuclear magnetic resonance, electron paramagnetic resonanace and infrared absorption spectra performed on thexBeO(1 –x)V₂O₅ system are reported. These suggest that, unlike previous statements, V₂O₅-BeO does not form solid solutions.     

The development of a multicenter database for reference values in clinical neurophysiology--principles and examples

This paper describes the work undertaken to establish principles for the development of multicenter databases for reference values in clinical neurophysiology. The study was initiated because of interest of the involved laboratories in knowledge-based systems in electromyographic diagnosis, for which it was necessary to formalize the key concepts in the diagnostic process: diseases, pathophysiology and test results. The paper deals specifically with the structuring of results of motor and sensory nerve conduction studies.     

Behaviour and Performance of a Water Resource System in Québec (Canada) Under Adapted Operating Policies in a Climate Change Context

The behaviour of the water resource system of the Peribonka River (Quebec, Canada) exploited for hydropower is evaluated under various hydrological regimes, using different climate change scenarios. The hydrological regime of the recent past and the regimes of 30 climate projections are considered. The potential hydrological regimes are simulated for climate projections from five general circulation models (GCM) for two greenhouse gas emission scenarios and three temporal horizons (2020, 2050 and 2080). For each hydrological regime, weekly reservoir operating rules are calculated with a dynamic and stochastic optimization model. Simulations of the water resource system with adapted operating rules in these climate change contexts are compared with the management of the water resource system at the control period (1961–1990). For the majority of climate projections, the analysis of simulations in the context of climate change shows an increase in hydropower and in annual unproductive spills. These increases reach 22% and 300%, respectively, compared to the control period. Also, the reliability of a reservoir is compromised for half of the climate projections, with annual probabilities reaching above the maximum operating levels, up to 0.3%, whereas these probabilities were null for the control period. Despite the rise in production, the annual efficiency of the power plants would fluctuate between −5 to +8%, depending on the power plant, the climate projection and the horizon.