نتایج جستجو برای: slope steepness
تعداد نتایج: 53977 فیلتر نتایج به سال:
BACKGROUND The restitution of the action potential duration (APDR) and conduction velocity (CVR) are mechanisms whereby cardiac excitation and repolarization adapt to changes in heart rate. They modulate the vulnerability to dangerous arrhythmia, but the mechanistic link between restitution and arrhythmogenesis remains only partially understood. METHODS This paper provides an experimental and...
Methods to speed up learning in back propagation and to optimize the network architecture have been recently studied. This paper shows how adaptation of the steepness of the sigmoids during learning treats these two topics in a common framework. The adaptation of the steepness of the sigmoids is obtained by gradient descent. The resulting learning dynamics can be simulated by a standard network...
To investigate the effect of surrounding tree density and topography site host on abundance, species richness, diversity epiphytic orchids, 32 trees Schima wallichii were chosen randomly orchids counted identified. Within a circle radius 20m from each tree, with diameter at breast height (DBH) greater than 20 cm had their name DBH recorded. In addition, angle direction slope which stood measure...
The main objective of this study was to investigate ecologically healthy regions near a dam reservoir. This study developed a model for assessing habitat suitability as a proxy for the ecological value of reservoirs. Three main factors comprising nine assessment variables were selected and classified as having a habitat suitability (HS) between 0 and 1: (1) geomorphic factors of altitude, slope...
Perception of an object's weight is linked to its form and motion. Studies have shown the relationship between weight perception and motion in horizontal and vertical environments to be universally identical across subjects during passive observation. Here we show a contradicting finding in that not all humans share the same motion-weight pairing. A virtual environment where participants contro...
The APEX (Agricultural Policy-Environmental eXtender) model developed in the United States was calibrated for northwestern China's conditions. The model was then used to investigate soil erosion effects associated with alternative land uses at the ZFG (Zi-Fang-Gully) watershed in northwestern China. The results indicated that the APEX model could be calibrated reasonably well (+/-15% errors) to...
• Policies have triggered rapid increases in SW China’s forest C stores. Tree species richness and density are strong predictors of biomass. Climate change negatively impacts on biomass increases. Policy adaptations can help sustain storage forests. Reforested areas act as important carbon (C) sinks. In China, extensive reforestation has been carried out mountainous regions, with resulting affe...
Efficacy of the SPEAK and ACE coding strategies was compared with that of a new strategy, MP3000™, by 37 European implant centers including 221 subjects. The SPEAK and ACE strategies are based on selection of 8-10 spectral components with the highest levels, while MP3000 is based on the selection of only 4-6 components, with the highest levels relative to an estimate of the spread of masking. ...
The mechanism of arrhythmogenicity in heart failure remains poorly understood. We examined the relationship between electrical abnormalities and ventricular arrhythmia by using experimental heart failure models. Sixty unipolar electrograms were recorded from the entire cardiac surface in control dogs (n = 13) and pacing-induced heart failure dogs (n = 16). In failing hearts, activation time (AT...
Barn owls process sound-localization information in two parallel pathways, the midbrain and the forebrain pathway. Exctracellular recordings of neural responses to auditory stimuli from far advanced stations of these pathways, the auditory arcopallium in the forebrain and the external nucleus of the inferior colliculus in the midbrain, demonstrated that the representations of interaural time di...
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