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RISS 인기검색어
- 검색키워드
- 저자 : Bertha A. Olmos (검색결과 2 건)
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Cord Dorsum Potentials Evoked by Electroacupuncture Applied to the Hind Limbs of Rats
Salvador Quiroz-González,Bertha Segura-Alegría,José Carlos Guadarrama-Olmos,Ismael Jiménez-Estrada 사단법인약침학회 2014 Journal of Acupuncture & Meridian Studies Vol.7 No.1
The longitudinal distribution of the cord dorsum potentials (CDPs) produced by electro- acupuncture (EA) stimulation at acupuncture points (APs) located on the hind limbs of rats was analyzed in this study. Single electrical pulses (0.05 ms, 1 Hz) applied to the bladder (BL) and the gallbladder (GB) APs produced CDPs on several spinal segments and were composed of the following four components: an afferent volley, two negative components (N₁and N₂), and one positive component (P wave). The larger evoked CDPs differed in their rostrocaudal distributions depending on the stimulated AP site, with those evoked by GB32e33 (at L3) and GB36e37 (at L4) being more caudal than those generated by BL58e59 (at L5) and BL37e38 (at L6). The CDPs produced by stimulating nonacupoints (NAPs) showed similar components and rostrocaudal distributions that were smaller in amplitude than those evoked by stimulating APs. The CDPs produced by stimulating NAPs located on a meridian acupuncture area were similar in amplitude and longitudinal distribution to those produced by stimulating APs. Our results suggest that the specificity of EA stimulation for CDPs responses is mainly related to an activa-tion of meridian pathways associated with peripheral nerve routes rather than to a restricted point specificity of APs.
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Use of Sliding Multirotational Devices of an Irregular Bridge in a Zone of High Seismicity
José M. Jara,Manuel Jara,Hugo Hernández,Bertha A. Olmos 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.1
The 525 meters long Infiernillo II bridge crosses the Infiernillo Dam and it is the first isolated bridge built in Mexico. It is located in the Morelia-Lazaro Cardenas highway that connects the central cities of the country to the Pacific Coast. Arch steel trusses compose the superstructure of the five simple supported spans. The substructure consists of reinforced concrete abutments and piers supported on cylinders and piles. The total cylinder-pier subsystem height is in the range of 46 m to 71 m, causing a strong irregularity in the transverse and longitudinal directions. The bridge was subjected to an assembly of real strong motion movements recorded close to the Pacific Coast in Mexico, site where the most severe earthquakes occur in the country. The study started by evaluating the analytical model with environmental vibration measurements previously taken. Based on the similarity of the results,none adjustment was required for the numerical model. The results show the importance of the isolator dynamic characteristics on the expected seismic behavior of the bridge. Special emphasis is dedicated to analyze the effectiveness of the isolation system for avoiding concentration of strength and displacement ductility demands on an irregular bridge substructure.
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