نتایج جستجو برای: random vortex method rvm
تعداد نتایج: 1877320 فیلتر نتایج به سال:
The task of RBF kernel selection in Relevance Vector Machines (RVM) is considered. RVM exploits a probabilistic Bayesian learning framework offering number of advantages to state-of-the-art Support Vector Machines. In particular RVM effectively avoids determination of regularization coefficient C via evidence maximization. In the paper we show that RBF kernel selection in Bayesian framework req...
The ECG is one of the most effective diagnostic tools to detect cardiac diseases. It is a method to measure and record different electrical potentials of the heart. The electrical potential generated by electrical activity in cardiac tissue is measured on the surface of the human body. Current flow, in the form of ions, signals contraction of cardiac muscle fibers leading to the heart's pumping...
در این مطالعه نقش گیرنده های ارکسین 1 در بخش منقاری شکمی- میانی بصل النخاع rvm) ( در تعدیل بی دردی ناشی از استرس شنای اجباری (sia) بررسی شد. روش ها: در این مطالعه، استرس شنای اجباری (6دقیقه در آب 1±20 درجه) به موش های صحرایی نر القا شد.برای القای درد، از آزمون فرمالین )50 میکرولیتر فرمالین 2%) استفاده شد sb334867 با دوز 1 میلی مولار و 0.1 میلی مولار به عنوان آنتاگونیست و ارکسین 1 به عنوان آگو...
The transient receptor potential vanilloid-1 (TRPV1) receptor is involved in peripheral and spinal nociceptive processing and is a therapeutic target for pain. We have shown previously that TRPV1 in the ventrolateral periaqueductal gray (VL-PAG) tonically contributes to brain stem descending antinociception by stimulating glutamate release into the rostral ventromedial medulla and off neuron ac...
Cell death has been reported in the CNS in models of neuropathic pain (Sugimoto et al., 1990; Whiteside and Munglani, 2001; Scholz et al., 2005; Fuccio et al., 2009). In our present study, we examined the effects of spinal nerve ligation (SNL) on the number of neurons in the rostral ventromedial medulla (RVM), a brainstem region involved in modulation of nociception. In rats receiving SNL, we f...
As a simplified model of randomly pinned vortex lattices or charge-density waves, we study the random-field XY model on square (d = 2) and simple cubic (d = 3) lattices. We verify in Monte Carlo simulations, that the average spacing between topological defects (vortices) diverges more strongly than the Imry-Ma pinning length as the random field strength, H, is reduced. We suggest that for d = 3...
Naloxone-precipitated opioid abstinence is associated with enhancement of reflex responses to noxious stimulation (hyperalgesia). The present experiments in lightly anesthetized rats were designed to determine (1) whether neurons in the rostral ventromedial medulla (RVM) contribute to this enhancement, and (2) whether this enhancement is due to removal of an inhibitory modulatory influence or t...
We study the superfluid-insulator transition of a particle-hole symmetric system of long-range interacting bosons in a time-dependent random potential in two dimensions, using the momentum-shell renormalization-group method. We find a new stable fixed point with non-zero values of the parameters representing the shortand long-range interactions and disorder when the interaction is asymptoticall...
Pain thresholds are, in part, set as a function of emotional and internal states by descending modulation of nociceptive transmission in the spinal cord. Neurons of the rostral ventromedial medulla (RVM) are thought to critically contribute to this process; however, the neural circuits and synaptic mechanisms by which distinct populations of RVM neurons facilitate or diminish pain remain elusiv...
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