Acta cientifica venezolana最新文献_第2页

[Characteristics of canopy plant substratum in a low land humid tropical forest (Upper Orinoco, Venezuela)]. [委内瑞拉上奥里诺科河低地湿润热带森林冠层植物基质特征]。

Acta cientifica venezolana Pub Date : 2004-01-01

José Ibrahin Hernández-Rosas

引用次数: 0

[Molecular identification of bovine enteric calciviruses in Venezuela]. [委内瑞拉牛肠道钙病毒的分子鉴定]。

Acta cientifica venezolana Pub Date : 2003-01-01

Ana C Alcalá, Mayra A Hidalgo, César Obando, Esmeralda Vizzi, Ferdinando Liprandi, Juan E Ludert

引用次数: 0

Flow dynamics in anatomical models of abdominal aortic aneurysms: computational analysis of pulsatile flow. 腹主动脉瘤解剖模型的血流动力学:脉动流的计算分析。

Acta cientifica venezolana Pub Date : 2003-01-01

Ender A Finol, Cristina H Amon

{"title":"Flow dynamics in anatomical models of abdominal aortic aneurysms: computational analysis of pulsatile flow.","authors":"Ender A Finol, Cristina H Amon","doi":"","DOIUrl":"","url":null,"abstract":"Blood flow in human arteries is dominated by time-dependent transport phenomena. In particular, in the abdominal segment of the aorta under a patient's average resting conditions, blood exhibits laminar flow patterns that are influenced by secondary flows induced by adjacent branches and in irregular vessel geometries. The flow dynamics becomes more complex when there is a pathological condition that causes changes in the normal structural composition of the vessel wall, for example, in the presence of an aneurysm. An aneurysm is an irreversible dilation of a blood vessel accompanied by weakening of the vessel wall. This work examines the importance of hemodynamics in the characterization of pulsatile blood flow patterns in individual Abdominal Aortic Aneurysm (AAA) models. These patient-specific computational models have been developed for the numerical simulation of the momentum transport equations utilizing the Finite Element Method (FEM) for the spatial and temporal discretization. We characterize pulsatile flow dynamics in AAAs for average resting conditions by means of identifying regions of disturbed flow and quantifying the disturbance by evaluating wall pressure and wall shear stresses at the aneurysm wall.","PeriodicalId":75378,"journal":{"name":"Acta cientifica venezolana","volume":"54 1","pages":"43-9"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40907728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[Telemedicine experiences in an urology educational institute]. [泌尿科教育机构的远程医疗经验]。

Acta cientifica venezolana Pub Date : 2003-01-01

Egilda Pérez, Guillermo Montilla, Hyxia Villegas

{"title":"[Telemedicine experiences in an urology educational institute].","authors":"Egilda Pérez, Guillermo Montilla, Hyxia Villegas","doi":"","DOIUrl":"","url":null,"abstract":"The Telemedicine (TM) it is a viable alternative to improve the quality of the attention to the patient; in order to obtain the suitable efficiency is convenient that specialists must handle with naturalness the technical concepts related to the installation and operation of the equipment required in a TM session. In this work results on telemedicine teaching at the Center of Image Processing, are presented, showing the development of this medical-technology project. The objective of the course was to upgrade the academic formation of the students in the area of the TM, showing its versatility through varied experiences and medical practice. The experimental phase of telemedicine course was made for the Master Degree Program in Urology of Carabobo University. This activity was carried out at the Urology Teaching Institute (IDU). This article describes the experience and explains details of the videoconference equipment's configuration, the medical peripherals used in TM, the telecommunications services installation, the medical ambient in TM and the course programming. The course was twelve (12) weeks long. Some tutorials were given to make level the doctor's knowledge and soon teleconsulting were made which are explained later. Courses of this category have been made in several countries. This it is the first formal experience in TM in Venezuela having didactic goals. This course allowed us to observe the interaction between doctors and TM equipment's, related to teleradiology (RX and ultrasound) and telecitoscopy.","PeriodicalId":75378,"journal":{"name":"Acta cientifica venezolana","volume":"54 1","pages":"50-7"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40907729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Construction of integrated case environments. 构建一体化案例环境。

Acta cientifica venezolana Pub Date : 2003-01-01

Francisca Losavio, Alfredo Matteo, María Pérez

{"title":"Construction of integrated case environments.","authors":"Francisca Losavio, Alfredo Matteo, María Pérez","doi":"","DOIUrl":"","url":null,"abstract":"The main goal of Computer-Aided Software Engineering (CASE) technology is to improve the entire software system development process. The CASE approach is not merely a technology; it involves a fundamental change in the process of software development. The tendency of the CASE approach, technically speaking, is the integration of tools that assist in the application of specific methods. In this sense, the environment architecture, which includes the platform and the system's hardware and software, constitutes the base of the CASE environment. The problem of tools integration has been proposed for two decades. Current integration efforts emphasize the interoperability of tools, especially in distributed environments. In this work we use the Brown approach. The environment resulting from the application of this model is called a federative environment, focusing on the fact that this architecture pays special attention to the connections among the components of the environment. This approach is now being used in component-based design. This paper describes a concrete experience in civil engineering and architecture fields, for the construction of an integrated CASE environment. A generic architectural framework based on an intermediary architectural pattern is applied to achieve the integration of the different tools. This intermediary represents the control perspective of the PAC (Presentation-Abstraction-Control) style, which has been implemented as a Mediator pattern and it has been used in the interactive systems domain. In addition, a process is given to construct the integrated CASE.","PeriodicalId":75378,"journal":{"name":"Acta cientifica venezolana","volume":"54 3","pages":"162-79"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41008806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[Description of the seismological network of the Venezuelan Andes]. [委内瑞拉安第斯山脉地震台网的描述]。

Acta cientifica venezolana Pub Date : 2003-01-01

Carlos Guada, María Morandi, José Silva

{"title":"[Description of the seismological network of the Venezuelan Andes].","authors":"Carlos Guada, María Morandi, José Silva","doi":"","DOIUrl":"","url":null,"abstract":"Western Venezuela shows a broad zone characterized by a moderate seismicity level, which has been the scenery of various historic earthquakes of destructive character. The beginning of the seismic instrumentation in the area dates from 1969, nevertheless it was 10 years later when the seismological network of the Venezuelan Andes (REDSAV) was permanently installed in order to characterize the regional earthquake activity. The REDSAV is an array of 10 remote seismic stations that sends the seismic signals by analog telemetry to the central station, located in the city of Mérida, where the digitalization, automatic event detection in real time and the analysis and off-line processing of the seismic information is carried out. During the last 10 years important advances have been taken place in terms of its operativity, which includes a dynamic web site (http://lgula.ciens.ula.ve) with a catalog of western Venezuela earthquakes, where the user can visualize the seismograms, the P and S wave arrival time, the polarities and epicentral maps; moreover, it is possible to select events applying temporal, spatial and magnitute criteria. In this paper the technical characteristic of the equipment are described and the advances registered in the last years referring to the automatic acquisition system, processing of the information and seismologic catalog of the REDSAV, whose systematic use during a decade has permitted to gather the biggest information base of related with the seismicity of the south-western Venezuela.","PeriodicalId":75378,"journal":{"name":"Acta cientifica venezolana","volume":"54 3","pages":"189-98"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41008808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[Prevalence of Anaplasma marginale and specific antibodies in new born calves]. [新生小牛边缘无原体和特异性抗体的患病率]。

Acta cientifica venezolana Pub Date : 2003-01-01

Catalina Rey Valeirón, Pedro María Aso, Alfredo Coronado

引用次数: 0

[Design of an impedance plethysmograph for reactive hyperemia evaluation in the forearm]. [用于前臂反应性充血评估的阻抗容积描记仪的设计]。

Acta cientifica venezolana Pub Date : 2003-01-01

Juan Enrique Parra, Fernando Mora, Guillermo Villegas, Eduardo Romero-Vecchione, José Vásquez

{"title":"[Design of an impedance plethysmograph for reactive hyperemia evaluation in the forearm].","authors":"Juan Enrique Parra, Fernando Mora, Guillermo Villegas, Eduardo Romero-Vecchione, José Vásquez","doi":"","DOIUrl":"","url":null,"abstract":"Impedance pletismography is based on the evaluation of the voltage change that occur as a consequence of blood flow variations in a particular tissue section. Current applied for the procedure should be alternating, weak and of high frequency to avoid electrically excitable cells stimulation, such as muscles and nerves. Blood volume changes can be measured by this method and has been applied in the diagnosis of deep venous thrombosis of limbs. An impedance meter was designed and built to be used in the forearm of patients. It consists of a voltage stabilizer TPS 76150 with simultaneous ECG recording (DII lead). Injected signal had 50 KHz (Wien's bridge) and registered through two operational amplifiers LM 3080 (1 mA). Signal was demodulated and amplified. Electrodes used were made of silver strips with conductance improved by conductivity gel, fixed by elastic rubber strips. Circuit wiring and equisition software was developed at the Bioengineering Department of Simón Bolívar University. Fifteen healthy subjects, age range 18-30 years old, were submitted to noninvasive forearm blood flow evaluation with the already described electronic device. Brachial artery occlusions were made with a cuff at subdiastolic, supradiastolic and suprasystolic blood pressures, for 60 and 90 seconds and then this occlusion was abruptly released. The curve was displayed and recorded in a portable PC (laptop). During suprasystolic occlusion the impedance observed curve showed a progressive increased until stabilization. When occlusion was released a sudden peak appeared which corresponds to reactive hyperemia of the forearm. This peak has been associated to the secretion of endothelial vasodilatory substances. In conclusion, this device is suitable to be used in clinical settings for the evaluation of reactive hyperemia and potentially useful in diagnosis of deep veins occlusions.","PeriodicalId":75378,"journal":{"name":"Acta cientifica venezolana","volume":"54 1","pages":"2-11"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40828804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Extension of indefinite functions on intervals of ordered groups. 不定函数在有序群区间上的推广。

Acta cientifica venezolana Pub Date : 2003-01-01

Ramón Bruzual, Marisela Domínguez

引用次数: 0

[Morphology and anatomy of the fruit and seed in development of Guarea macrophylla Vahl. (Meltaceae)]. [j] .大叶瓜属植物果实和种子发育的形态学和解剖学。(Meltaceae)]。

Acta cientifica venezolana Pub Date : 2003-01-01

Daniela Dias Pinto, Káthia S M Mourio, Luiz A de Souza, Ismar S Moscheta

引用次数: 0