检索结果-南通市图书馆

Synchronization of Robot Manipulators Actuated By Induction Motors with Velocity Estimator

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2019年第11期121卷 609-630页

作者： Felipe J.Torres Gerardo V.Guerrero Carlos D.garc.a Ricardo Zavala-Yoe Mario A.garc.a adolfo R.López University of Guanajuato Division of Engineering Campus Irapuato-SalamancaCarretera Salamanca-Valle de Santiago km 3.5+1.8GuanajuatoSalamanca36885México National Technological of Mexico/National Center of Research and Technological Development Av.Palmira S/N colonia PalmiraMorelosCuernavaca62490México School of Engineering and Sciences Monterrey TechnologicalPuente 222 Ejidos de HuipulcoCiudad de México14380México Superior Technological Institute of Irapuato Carretera Irapuato-Silao km 12.5GuanajuatoIrapuato36821México

A complete modeling(including the actuator dynamics)of a robot manipulator that uses three-phase induction motors is presented in this paper.A control scheme is designed to synchronize robot manipulators actuated by induction motors under a masterslave scheme in the case where the joint velocity of the slave robots is *** of the research on the synchronization of robot manipulators assumes the use of ideal actuators to drive the joints;for that reason,in this work,a three-phase induction motor is considered to be a direct-drive actuator for each *** entire model of the mated system is obtained by a combination of the dynamics of the induction motor and robot ***,the synchronization control algorithm for a master-slave scheme in both the joint space and workspace of robot manipulators driven by induction motors is *** observer based on the entire model is proposed to estimate the joint velocity of the slave robot *** the Lyapunov criterion,a stability analysis of the synchronization control with a velocity estimator is *** analytical results show the synchronization and estimation errors are globally,uniformly,and ultimately *** with multiple robots demonstrate the performance of the proposed control algorithm.

关键词： Synchronization robot manipulator induction motor Lyapunov stability observer based on the model

Validation of Fujinon intelligent chromoendoscopy with high definition endoscopes in colonoscopy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2009年第42期15卷 5266-5273页

作者： adolfo Parra-Blanco Alejandro Jiménez Bjrn Rembacken Nicolás González David Nicolás-Pérez Antonio Z Gimeno-garc.a Marta Carrillo-Palau Takahisa Matsuda Enrique Quintero Department of Gastroenterology University Hospital of the Canary Islandsc/Ofra s/nLa Laguna 38320TenerifeSpain Department of Gastroenterology Hospital Universitario Central de AsturiasCelestino Villamil s/n33006 OviedoPrincipado de AsturiasSpain Research Unit University Hospital of the Canary Islandsc/Ofra s/nLa Laguna 38320TenerifeSpain Centre for Digestive Diseases The General Infirmary at LeedsGreat George StLeedsLS1 3EXUnited Kingdom Department of Gastroenterology Hospital de Clínicas de MontevideoAvda.Italia s/nMontevideo 11600Uruguay Division of Endoscopy National Cancer Center Hospital5-1-1 TsukijiChuo-kuTokyo 104-0045Japan

AIM:To validate high definition endoscopes with Fujinon intelligent chromoendoscopy(FICE) in ***:The image quality of normal white light endoscopy(WLE),that of the 10 available FICE filters and that of a gold standard(0.2% indigo carmine dye) were ***:FICE-filter 4 [red,green,and blue(RGB) wavelengths of 520,500,and 405 nm,respectively] provided the best images for evaluating the vascular pattern compared to white *** mucosal surface was best assessed using filter ***,the views obtained were not rated significantly better than those observed with white *** "gold standard",indigo carmine(IC) dye,was found to be superior to both white light and filter *** 6(RGB wavelengths of 580,520,and 460 nm,respectively) allowed for exploration of the IC-stained *** assessing mucosal polyps,both FICE with magnification,and magnification following dye spraying were superior to the same techniques without magnification and to white light *** the presence of suboptimal bowel preparation,observation with the FICE mode was possible,and endoscopists considered it to be superior to observation with white ***:FICE-filter 4 with magnification improves the image quality of the colonic vascular patterns obtained with WLE.

关键词： Colonoscopy Computed virtual chromoendoscopy Fujinon intelligent chromoendoscopy Magnifying colonoscopy Polyp diagnosis

Endoscopic submucosal dissection training with pig models in a Western country

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2010年第23期16卷 2895-2900页

作者： adolfo Parra-Blanco María Rosa Arnau David Nicolás-Pérez Antonio Z Gimeno-garc.a Nicolás González Juan A Díaz-Acosta Alejandro Jiménez Enrique Quintero Department of Gastroenterology University Hospital of the Canary Islands Ofra s/n Endoscopy Unit Department of GastroenterologyAsturias Central University HospitalCelestino Villamil s/n Research Animal Laboratory Ofra s/nLa Laguna University Department of Gastroenterology Montevideo Clinic HospitalAvda Italia s/n Research Unit University Hospital of the Canary IslandsOfra s/n

AIM:To test a strategy for endoscopic submucosal dissection(ESD) training in animal models designed to overcome the initial learning ***:ESD was attempted in ex vivo and in vivo pig *** ESD procedures were attempted in the esophagus(n=9) or the stomach(n=21).The ex vivo model was used until initial competence was *** the in vivo model,several ESD procedures were performed in up to 3 *** following variables were analyzed:specimen size,complete and en bloc resection rate,time for circumferential incision,time for submucosal dissection,total ESD duration,and ***:Complete resection was achieved in 28 cases(en bloc 27);2 could not be completed(one perforation,one technical diff iculty).The mean ± SD time for circumferential incision was 36.2±16.8 min(range:8-87 min),and the mean±SD time for submucosal dissection was 45.1±35.7 min(range:9-196 min).The mean±SD size of the resected specimens was 45.2±17.8 *** mean±SD total resection time was signif icantly increased for the gastric cases performed in the f irst half of the study(n=13) than in the second half(n=8)(98.9±62.4 min vs 61.7±17.6 min,P=0.04),although the specimen size did not ***:Training in animal models could help endoscopists overcome the learning curve before starting ESD in humans.

关键词： Endoscopic submucosal dissection Training Animal model

Improvement of transfection with reprogramming factors in urine-derived cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

BIOCELL 2020年第3期44卷 401-409页

作者： OLIVIA A.ROBLES-RODRÍGUEZ MARÍA J.LOERA-ARIAS JOSÉJ.PÉREZ-TRUJILLO ARNULFO VILLANUEVA-OLIVO ERNESTO PICÓN-GALINDO LAURA VILLARREAL-MARTÍNEZ adolfo SOTO-DOMÍNGUEZ HUMBERTO RODRÍGUEZROCHA ARACELY garc.a-garc.a ODILA SAUCEDO-CÁRDENAS ROBERTO MONTES DE OCA-LUNA Facultad de Medicina Departamento de HistologíaUniversidad Autónoma de Nuevo LeónMonterreyC.P.64460México Hospital Universitario“Dr.JoséEleuterio González González” Servicio de HematologíaUniversidad Autónoma de Nuevo LeónMonterreyC.P.64460México Centro de Investigación Biomédica del Noreste Departamento de Genética MolecularInstituto Mexicano del Seguro SocialMonterreyC.P.64720México

Human-induced pluripotent stem cells(iPSCs)are an accessible source of adult-derived,patient-specific pluripotent stem cells for use in basic research,drug discovery,disease modeling,and stem cell *** the accessibility of methods to obtain iPSCs regardless of the cell source can enhance their clinical ***,our purpose is to report a simple protocol to obtain iPS-like cells from urine-derived renal epithelial cells(RECs)using different extracellular matrices and transfection *** this study,we began by culturing urine-derived cells from healthy donors to establish a primary culture of renal epithelial cells,followed by their ***,we generated iPS-like cells by transfecting renal epithelial cells(RECs)with vectors expressing Oct4,Sox2,L-Myc,Lin-28,and Klf4,and we compared the efficacy of different extracellular matrices and transfection *** resultant iPS-like cells showed a human embryonic stem cell-like morphology and expressed the specific pluripotency markers Oct3/4,Nanog,Lin28,and *** concluded that Lipofectamine Stem Cell transfection reagent is more effective than FuGENE in obtaining iPS-like cells under the conditions ***,the three matrices are similar in their efficiency of obtaining iPS-like *** report provides an experimental protocol for obtaining and generating iPS-like cells from urine samples for further cell therapy research on different human diseases.

关键词： Reprogramming factors iPSCs Renal epithelial cells Extracellular matrix Transfection reagent

Uremic Bleeding in 2 Patients with Dieulafoy’s Lesion: Case Report and Literature Review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The timing of bowel preparation before colonoscopy determines the quality of cleansing,and is a significant factor contributing to the detection of flat lesions:A randomized study

Open Journal of Gastroenterology（肠胃病学期刊） 2024年第5期 167页

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第38期12卷 6161-6166页

作者： adolfo Parra-Blanco David Nicolás-Pérez Antonio Gimeno-garc.a Begoa Grosso Alejandro Jiménez Juan Ortega Enrique Quintero Department of Gastroenterology Hospital Universitario de Canarias La Laguna 38109 Santa Cruz de Tenerife Spain Research Unit Hospital Universitario de Canarias La Laguna 38109 Santa Cruz de Tenerife Spain

AIM： To compare the cleansing quality of polyethylene glycol electrolyte solution and sodium phosphate with different schedules of administration, and to evaluate whether the timing of the administration of bowel preparation affects the detection of polyps. METHODS： One hundred and seventy-seven consecutive outpatients scheduled for colonoscopy were randomized in one of four groups to receive polyethylene glycol electrolyte solution or oral sodium phosphate with two different timing schedules. Quality of cleansing, polyp detection, and tolerance were evaluated. RESULTS： Patients receiving polyethylene glycol or sodium phosphate on the same day as the colonoscopy, obtained good to excellent global cleansing scores more frequently than patients who received polyethylene glycol or sodium phosphate on the day prior to the procedure （P 〈 0.001）. Flat lesions, but not fiat adenomas, were more frequent in patients prepared on the same day （P = 0.02）. CONCLUSION： The quality of colonic cleansing and the detection of fiat lesions are significantly improved when the preparation is taken on the day of the colonoscopy.

关键词： Colonoscopy Preparation Polyp Flat lesion Sodium phosphate Polyethylene glycol

The Tesistan, Mexico earthquake (M_w 4.9) of 11 May 2016: seismic-tectonic environment and resonance vulnerability on buildings

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2019年第3期18卷 579-595页

作者： Alejandro Ramírez-Gaytán adolfo Preciado William L. Bandy Edilson F. Salazar-Monroy Miguel A. Jaimes Leonardo Alcantara Departamento de Ciencias Computacionales Centro Universitario de Ciencias Exactas e Ingeniería Universidad de Guadalajara Boulevard Marcelino García Barragán # 1421 44430 Guadalajara Jalisco México Departamento del Hábitat y Desarrollo Urbano Instituto Tecnológico y de Estudios Superiores de Occidente (ITESO). Periférico Sur Manuel Gómez Morin 8585 45604 Tlaquepaque Jalisco México Instituto de Geofísica Universidad Nacional Autónoma de México Circuito Interior Ciudad Universitaria Del. Coyoacán 04510 México Programa de Posgrado en Ciencias de la Tierra Universidad Nacional Autó noma de Mé xico Circuito Interior Ciudad Universitaria Del. Coyoacá n 04510 Mé xico Instituto de Ingenieria Universidad Nacional Autónoma de México Circuito Interior Ciudad Universitaria Del. Coyoacán 04510 México

To highlight the importance of small earthquakes in seismic hazard, a study of the 11 May 2016, Mw 4.9, Tesistan, Mexico earthquake is presented. Due to the close proximity of the event to the city, accelerations were considerably higher than those caused by historical severe earthquakes (6.0 < Mw < 8.2). This paper addresses two objectives related to the Tesistan event: the fi rst is to estimate the focal mechanism solution in order to place the event in the context of the tectonic environment of this area. The second is focused on a vulnerability evaluation of buildings that suff ered resonance. Several building′s typologies with variations in construction system and height are assessed in terms of resonance with the structural and soil periods. The results show that around the Zapopan station, strong damage is expected in intermediate to high-rise buildings (12-30 m) with moment resistant frame systems and in reinforced concrete shear walls. Masonry structures around this station may not present resonance. In contrast, in the surroundings of the Guadalajara station, all intermediate height buildings from 9 to 21 m may present resonance.

关键词： Tesistan earthquake seismicity of Guadalajara site eff ects structural vulnerability

Study of the (Ca1–xSrx) RuO3System with Nano-Crystals Prepared by the Solid-State Reaction Method

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Materials Sciences and Applications 2015年第1期6卷 16-22页

作者： adolfo Quiroz Elizabeth Chavira José Eduardo Espinosa Rodolfo Palomino-Merino Ernesto Esteban Marinero Masaya Nishioka Valentín garc.a-Vázquez Facultad de Ciencias Fí sico-Matemá ticas Postgrado en F&iacute sica Aplicada Benem&eacute rita Universidad Autónoma Puebla Ciudad Universitaria Puebla M&eacute xico Instituto de Investigaciones en Materiales Universidad Nacional Autónoma de M&eacute xico M&eacute xico D.F. M&eacute xico Purdue University West Lafayette IN USA Hitachi San José Research Center San Jos&eacute California USA Instituto de Fí sica LRT Benem&eacute rita Universidad Autónoma de Puebla Puebla M&eacute xico

We present a study of their structure, morphology, electrical and magnetic properties on the (Ca1–xSrx) RuO3 system for x = 0.0, 0.07, 0.10, 0.15 and 1.0. The samples were prepared by the solidstate reaction method in air at ambient pressure and heat in the 700℃ - 800℃ range for 48 h. By X-ray powder diffraction (XRD), we determine a solid solution until x = 0.15. Scanning electron microscopy (SEM) indicates that the particle size is 77 - 266 nm. The resistance measurements, as a function of temperature measurements from 7 to 300 K the (Ca1–xSrx) RuO3 system for x = 0.0, 0.07, 0.10, 0.15 and 1.0 show a metallic behaviour. We can even observe that the resistance of the samples is due to the partial substitution of Sr2+ ions and Ru ion valence. Finally, the sample x = 0.07 has a magnetization applied high field to 10 K, whereas that to 300 K does not have a magnetization.

关键词： Solid-State Reaction XRD SEM Electric Resistivity Magnetic Properties

Minimally Invasive Pericranial Flap for Reconstruction after Endonasal Endoscopic Surgery of 30 Consecutive Patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Otolaryngology and Head & Neck Surgery 2018年第4期7卷 199-208页

作者： Joel Caballero-garc.a Iosmill Morales Pérez adolfo Michel Giol álvarez Nélido Gonzáles Fernández Bismark Rafael Barcia Sánchez Roxana Bethzave Ortega Pineda National Institute of Oncology and Radiobiology Havana Cuba Juan Manuel Márquez Pediatric Hospital Havana Cuba

Objectives/Hypothesis: The introduction of intranasal pedicled flaps has reduced the incidence of postoperative cerebrospinal fluid (CSF) leaks to less than 5%. Nevertheless, in malignant tumors those flaps are not always available because of nasal septum invasion. Minimally invasive pericranial flaps (PCF) are associated with minimal adverse effects and good cosmetic appearance. In spite of that, there are only a few reports of this reconstructive technic limited to short surgical series and radio-anatomical analysis. Clinical results of a surgical cohort are presented. Study Design: Cohort prospective study. Methods: Clinical data, including age, gender, stage, histopathological findings, rate of complications and appearance of PCF at fifth day and two months postoperative were recorded. Postoperative morbidities were recorded as wound abnormalities, nasosinusal, orbital and central nervous system complications. Chi-squared test was used to correlate qualitative variables and Student-t-test to correlated qualitative and quantitative variables. Items were considered statistically significant with a p value of less than 0.05 (confidence Interval of 95%). Results: Thirty patients (18 males and 12 females) were registered. Mean age was 51.5 years ± 23.0 and range between 20 and 71 years. Most common histologic subtypes were adenocarcinoma, epidermoid carcinoma and squamous cell carcinoma. Complete resection of the tumor was achieved in all patients including surgical margins. Length of the PCF varies between 9.9 cm and 13.9 cm with a mean of 11.8 cm. There was an association between length of the flaps and the covering structure with the nose apex relation. None patient experienced postoperative cerebrospinal fluid (CSF) leak, frontal sinusitis or other complications. Conclusions: Minimally invasive PCF constitute a good and inexpensive reconstructive option in patients with malignant anterior cranial base tumors in whose nasoseptal flap was not a feasible option.

关键词： Minimally Invasive Pericranial Flap Anterior Cranial Base Reconstruction