نتایج جستجو برای: تحلیل شبکههای اجتماعی sna

تعداد نتایج: 285493  

Journal: :RFC 1993
Wilfred Behl Barbara Sterling William Teskey

This RFC provides information for the Internet community about a method for establishing and maintaining SNA sessions over an IP internet. While the issues discussed may not be directly relevant to the research problems of the Internet, they may be interesting to a number of researchers and implementors. Any questions or comments relative to the contents of this RFC may be sent to the following...

2018
Dillon F. Da Fonte Chris J. Martyniuk Lei Xing Vance L. Trudeau

Radial glial cells (RGCs) are the main macroglia in the teleost brain and have established roles in neurogenesis and neurosteroidogenesis. They are the only brain cell type expressing aromatase B (cyp19a1b), the enzyme that synthesizes estrogens from androgen precursors. There are few studies on the regulation of RGC functions, but our previous investigations demonstrated that dopamine stimulat...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده مکانیک 1392

هدف این پروژه استخراج معادله ساختاری رفتار مکانیکی قطعه کار در فرآیند نورد گرم می‏باشد. برای این منظور از دو روش تحلیلی و شبکه عصبی برای بدست آوردن مدل رفتار مکانیکی قطعه در حین تغییر شکل استفاده گردیده است. در روش تحلیلی با استفاده از روابط ریاضی موجود بین پارامترهای تأثیرگذار بر فرآیند و با به‏کارگیری روش تحلیل معکوس مدل مورد بحث به صورت تابعی از کرنش، نرخ کرنش و دمای میانگین هر قفسه ارائه گ...

صنایع خودروسازی به‌دلیل داشتن زنجیره تأمین طولانی و شبکۀ ارتباطات گسترده میان عناصر متشکلۀ آن با ریسک‌های بسیاری مواجه‌اند. شرکت سایپا (یکی از مهم‌ترین قطب‌های خودروسازی کشور) در سال‌های اخیر درزمینۀ چگونگی شناسایی، اولویت‌بندی و مدیریت ریسک‌های موجود در زنجیره تأمین خود با چالش‌های بسیاری مواجه بوده است؛ به‌طوری‌که همواره مقابله با این چالش از اولویت‌های اصلی پژوهش‌های این مجموعه بوده است. هدف...

Journal: :American journal of physiology. Heart and circulatory physiology 2013
Sean D Stocker Martin S Muntzel

The sympathetic nervous system plays a pivotal role in homeostasis through its direct innervation and functional impact on a variety of end organs. In rats, a number of methods are available to assess sympathetic nervous system function. Traditionally, direct recording of sympathetic nerve activity (SNA) has been restricted to acute, anesthetized preparations or conscious animals within a few d...

Journal: :American journal of physiology. Heart and circulatory physiology 2010
Atsunori Kamiya Toru Kawada Masaki Mizuno Shuji Shimizu Masaru Sugimachi

Since humans are under ceaseless orthostatic stress, the mechanisms to maintain arterial pressure (AP) against gravitational fluid shift are important. As one mechanism, it was reported that upright tilt reset baroreflex control of renal sympathetic nerve activity (SNA) to a higher SNA in anesthetized rabbits. In the present study, we tested the hypothesis that upright tilt causes a parallel re...

Journal: :Neuron 2006
Gina Turrigiano

Many developing networks generate spontaneous network activity (SNA) that plays an important role in setting up functional circuitry, but how the proper level and pattern of SNA is itself maintained has not been clear. In this issue of Neuron, Gonzalez-Islas and Wenner show that SNA in the intact embryo regulates itself through a set of adaptive homeostatic plasticity mechanisms.

2018
Takeshi Tohyama Keita Saku Toru Kawada Takuya Kishi Keimei Yoshida Takuya Nishikawa Hiroshi Mannoji Kazuhiro Kamada Kenji Sunagawa Hiroyuki Tsutsui

BACKGROUND Lipopolysaccharide (LPS) induces acute inflammation, activates sympathetic nerve activity (SNA) and alters hemodynamics. Since the arterial baroreflex is a negative feedback system to stabilize arterial pressure (AP), examining the arterial baroreflex function is a prerequisite to understanding complex hemodynamics under LPS challenge. We investigated the impact of LPS-induced acute ...

2012
Laiche Djouhri Xin Fang Stella Koutsikou Sally N. Lawson

Partial nerve injury leads to peripheral neuropathic pain. This injury results in conducting/uninterrupted (also called uninjured) sensory fibres, conducting through the damaged nerve alongside axotomised/degenerating fibres. In rats seven days after L5 spinal nerve axotomy (SNA) or modified-SNA (added loose-ligation of L4 spinal nerve with neuroinflammation-inducing chromic-gut), we investigat...

Journal: :Circulation 1998
K Narkiewicz P J van de Borne M Hausberg R L Cooley M D Winniford D E Davison V K Somers

BACKGROUND It is generally accepted that smoking increases blood pressure and inhibits muscle sympathetic nerve activity (SNA). The decrease in muscle SNA with cigarette smoking might be secondary to baroreflex responses to the pressor effect of smoking, thus obscuring a sympathetic excitatory effect of smoking. We tested the hypothesis that smoking increases sympathetic outflow. METHODS AND ...

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