A5101666753- Multilevel Inverters and Converters
- Advanced DC-DC Converters
- Silicon Carbide Semiconductor Technologies
- Magnetic Properties and Applications
- Sensorless Control of Electric Motors
- Advanced Battery Technologies Research
- Microgrid Control and Optimization
- Environmental and Ecological Studies
- Power Quality and Harmonics
- Neural Networks and Applications
- Photovoltaic System Optimization Techniques
- Electric Motor Design and Analysis
- solar cell performance optimization
- Connective Tissue Growth Factor Research
- Engineering and Technology Innovations
- Botanical Research and Applications
- Advanced Power Amplifier Design
- Power System Optimization and Stability
- Business, Innovation, and Economy
- Herbal Medicine Research Studies
- Machine Fault Diagnosis Techniques
- Health Promotion and Cardiovascular Prevention
- Hybrid Renewable Energy Systems
- Medicinal plant effects and applications
- Cassava research and cyanide
National University of the Littoral
2024
University of the Amazon
2023
Universidad del Norte
2023
Temuco Catholic University
2021
Universidad Simón Bolívar
2010-2018
Simón Bolívar University
1999-2014
Allergan (United States)
2003-2008
DuPont (United States)
2006
Universidad Nacional de Colombia
1985
A prostamide analogue, bimatoprost, has been shown to be effective in reducing intraocular pressure, but its precise mechanism of action remains unclear. Hence, elucidate the molecular mechanisms this effect we focused on pharmacologically characterizing prostaglandin FP receptor (FP) and variant (altFP) complexes.FP mRNA variants were identified by reverse transcription-polymerase chain reaction. The FP-altFP4 heterodimers established HEK293/EBNA cells co-expressing altFP4 variants....
Connective tissue growth factor (CTGF) and Cyr61 (cysteine-rich angiogenic protein 61) are members of the CCN gene family that encode multifunctional, extracellular matrix-associated signaling proteins. Because mechanism action certain anti-glaucoma drugs involves matrix remodeling ocular ciliary muscle, with a resultant increase in drainage aqueous humor from eye, we compared effects three pharmacologically distinct hypotensive agents on CTGF expression. Thus, prostaglandin F2α (PGF2α) (FP...
This work presents the design and development of a three-phase multilevel hardware platform for applications in power electronics. The emphasis proposed converter is its flexibility to allow rapid set-ups different experiments typically required electronics teaching research. uses cascaded H-bridge topology whereby operation with up 9 voltage levels can be obtained. selected stage as well control, drivers sensors boards designs, enable operate multiple configurations, namely inverter,...
Regulator of G protein signaling (RGS) proteins act as GTPase-activating (GAPs) for Galpha subunits and negatively regulate protein-coupled receptor signaling. Using RGS5 gene-specific RT-PCR, we have identified a novel alternative splicing variant mRNA in human ocular tissues. The occurred at position +44 (GenBank NM_003617), spliced out 174 bp (+44 to +218 bp) the coding region, encoded an RGS5s with 108 amino acid N-terminal deletion. This study is first document gene. We therefore...
Using gene chip technology, we first identified that PGF 2 α (FP agonist) and Butaprost (EP induced about a five‐fold upregulation of Nur77 mRNA expression in hFP‐HEK 293/EBNA hEP ‐HEK293/EBNA cells. Northern Blot analysis revealed ‐ Butaprost‐induced are dose‐ time‐dependent. Both upregulated through the protein kinase C (PKC) pathway. These data showing link between EP receptor stimulation activation. Calcineurin was found to be involved downstream PKC pathway ‐induced expression, but not...
This paper presents a generalized and compact space vector modulation algorithm valid for both (a, b, c) (x, y) coordinates, suitable triangle comparison modulators. The proposed uses two base-vectors duty cycle computation by mapping the solution into only three parallelogram shaped zones (Fig. A). is especially suited control applications requiring high dynamic response where changes in demand may happen at frequency comparable with modulator's carrier frequency. Several base methods...
Presents letters sent to the editor regarding previous articles from this publication or other relevant topics of discussion.
The spatial vector concept of the instantaneous apparent power is defined. Some advantages obtained using these definitions in measuring a three-phase system and control electrical machines are discussed. Also, physical interpretation given based on conventional electromagnetic theory.
This paper presents the analysis of kernel effect on time-frequency representations used in measuring AC machine rotor speed, without use shaft mounted sensors. speed method is based related harmonics that arise from slotting. In present work, Wigner-Ville distribution and Page are analyzed.
This work presents an efficiency improvement of a simple maximum power point tracking (MPPT) configuration, achieved by current feedback. The output provided the photovoltaic (PV) panel is used as signal controlling duty cycle PWM converter that regulates PV output. system performance analyzed with help accurate PSpice model cells developed for this application and experimentally improved. results, both simulation experimental, show proposed improved MPPT circuit highly efficient. Since...
A neural network induction machine model, including its dynamic behavior, has been developed. The model is intended to be used in vector control drives and 15 linearly dependent on the parameters For this reason, can adapted real time without retraining.
In this work, the possibilities offered by additional switching states present in an asymmetric three phase converter (compared with existing conventional inverter) are studied order to improve performance of Direct Torque Control induction motor drives. The proposed algorithms make use these sets increase operational range and reduce ripple system variables. Simulated experimental results obtained for different presented compared.
The spatial vector transformation, as used in machine control, is applied to power system analysis. proposed methodology electronics converters, transformers and transmission lines, well sources loads with different connections (delta-wye). This method can be steady-state, transient, unbalanced harmonic Models obtained using this are simple the per-phase schematic approach. instantaneous active reactive concepts expanded generalized, new control strategies developed when converters used....
Abstract Galaxias maculatus aquaculture objectives is to produce millions of eggs. Wild females are small (2 g), have quick sexual maturity and low mean fecundity (500 eggs/female), requiring larger fishes with higher fecundity. This study aim evaluate experimentally the effect levels protein, lipid dietary energy on weight increases in adults. Five independent experiments were performed at different sequential time periods UCT hatchery, Chile. Specimens obtained from a) Crystalline sea...
Este trabajo analiza las medidas de ahorro energía posibles en una empresa producción, con la finalidad establecer recomendaciones que contribuyan al uso eficiente energía. Esta investigación es tipo descriptivo-documental, sustentada un campo, donde se analizan los diferentes procesos producción y servicios industriales. Utilizando datos suministrados horas trabajo, realiza estimación del consumo mensual para determinar el impacto facturación electricidad; análisis restringe cálculo índices...
This work presents three fuzzy variable structure control (FVSC) techniques applied to the current loop in a three-phase synchronous rectifier. These are based Takagi-Sugeno (T-S) PI controller. The first controller is first-order FVSC, used as reference. Then, two FVSC strategies presented and tested, second third-order FVSC. schemes simulated then tested general-purpose laboratory rectifier test bench. Experimental results show that performance good all schemes, achieving harmonic...
La fumagina (Capnodium sp.) es una enfermedad que se presenta en los cítricos y limita el desarrollo de las plantas, al reducir la actividad fotosintética intercambio gaseoso. Se evaluó efecto cuatro tratamientos CALSU10: caldo sulfocálcico 10%, Podas: podas mantenimiento, CALSU10 + 10% Testigo: sin aplicación sulfocálcico, ni poda., control hojas mandarina (Citrus reticulata). Los resultados obtenidos mostraron incidencia fue similar todos a 14, 28 42 días posteriores 56 mayor Testigo menor...