Application of Support Vector Machine to Obtain the Dynamic Model of Proton-Exchange Membrane Fuel Cell.

An accurate model of a proton-exchange membrane fuel cell (PEMFC) is important for understanding this fuel cell's dynamic process and behavior. Among different large-scale energy storage systems, fuel cell technology does not have geographical requirements. To provide an effective operation estimation of PEMFC, this paper proposes a support vector machine (SVM) based model.

Modelling of Proton Exchange Membrane Fuel Cells with Sinusoidal Approach.

This paper validates a sinusoidal approach for the proton-exchange membrane fuel cell (PEMFC) model as a supplement to experimental studies. An FC simulation or hardware emulation is necessary for prototype design, testing, and fault diagnosis to reduce the overall cost. For this objective, a sinusoidal model that is capable of accurately estimating the voltage behavior from the operating current value of the DC was developed.

A Composite DC-DC Converter Based on the Versatile Buck-Boost Topology for Electric Vehicle Applications.

The composite converter allows integrating the high-efficiency converter modules to achieve superior efficiency performance, becoming a prominent solution for electric transport power conversion. In this work, the versatile buck-boost dc-dc converter is proposed to be integrated into an electric vehicle composite architecture that requires a wide voltage range in the dc link to improve the electric motor efficiency. The inductor core of this versatile buck-boost converter has been redesigned for high voltage applications.

RT Box card for studying the control communication impacts on microgrid performance and stability.

This work presents the design process of an RT Box interface for control systems in microgrid applications. The control card allows implementing different controls and communication systems for microgrids in a physical environment, facilitating the development of robust control systems facing inherent adverse scenarios such as delays, loss of information packets, failures of partial or permanent communication and noise in signal overflows, among others. In addition, it permits the generation of programming resources and behavioral antecedents, helpful information for future users of the control card interface.

Retrospective study of secondary implantation of retroiridial fixation lenses in patients without capsular support: functional results and complications.

Introduction: The correction of aphakia when there is no adequate capsular support remains a therapeutic challenge. The use of retroiridial fixation lenses has been extended given their lower complication rate compared to other available options.

Material And Methods: Retrospective study including all cases operated with an Artisan® retropupillary aphakia implant.

Dynamic Modeling of a Proton-Exchange Membrane Fuel Cell Using a Gaussian Approach.

This paper proposes a Gaussian approach for the proton-exchange membrane fuel cell (PEMFC) model that estimates its voltage behavior from the operating current value. A multi-parametric Gaussian model and an unconstrained optimization formulation based on a conventional non-linear least squares optimizer is mainly considered. The model is tested using experimental data from the Ballard Nexa 1.

A Bidirectional Versatile Buck-Boost Converter Driver for Electric Vehicle Applications.

This work presents a novel dc-dc bidirectional buck-boost converter between a battery pack and the inverter to regulate the dc-bus in an electric vehicle (EV) powertrain. The converter is based on the versatile buck-boost converter, which has shown an excellent performance in different fuel cell systems operating in low-voltage and hard-switching applications. Therefore, extending this converter to higher voltage applications such as the EV is a challenging task reported in this work.

DC Voltage Sensorless Predictive Control of a High-Efficiency PFC Single-Phase Rectifier Based on the Versatile Buck-Boost Converter.

Many electronic power distribution systems have strong needs for highly efficient AC-DC conversion that can be satisfied by using a buck-boost converter at the core of the power factor correction (PFC) stage. These converters can regulate the input voltage in a wide range with reduced efforts compared to other solutions. As a result, buck-boost converters could potentially improve the efficiency in applications requiring DC voltages lower than the peak grid voltage.

[Subretinal neovascular membrane in angioid streaks treated with intravitreal bevacizumab].

Introduction: Angioid streaks are breaks in Bruch's membrane that may be associated, among others, with pseudoxanthoma elasticum. Its most common complication is the development of subretinal neovascular membranes (SRNVM) and the decreased vision this entails.

Case Report: A 28 year old woman with angioid streaks and SRNVM in the left eye, who received 3 injections of intravitreal bevacizumab, with rapid improvement in vision and stability during 11 months follow up.

Epiretinal membrane surgery: anatomic and functional outcomes.

Objective: To study the influence of anatomic preoperative characteristics (based on the parameter, foveal central thickness, measured by optical coherence tomography) and functional characteristics (based on the parameter, best corrected visual acuity, [BCVA]) on functional recovery after epiretinal membrane (ERM) surgery.

Methods: A total of 88 eyes (of 86 patients), on whom a vitrectomy due to ERM was performed during a 3 years period were reviewed in this longitudinal, prospective study. An analysis was made of, ERM aetiology, BCVA, presence or absence of metamorphopsia, lens status, and central foveal thickness.

[Retinal capillary hemangioma and von Hippel-Lindau disease: diagnostic and therapeutic implications].

Clinical Case: Man carrier of the von Hippel-Lindau (VHL) gene, with long-onset loss of vision in left eye. He had a retinal capillary hemangioma (HCR) and diffuse cystic edema in posterior pole. The systemic study revealed bilateral kidney tumors.

[Outcomes of macular hole surgery using three different surgical techniques].

Purpose: To compare the effectiveness, efficiency and complications of three different surgical techniques employed for the treatment of macular holes between 1998 -2004 in our health care centre.

Methods: A retrospective, comparative, and non-randomized study of 131 eyes with macular holes, stage III and IV, treated with three different surgical techniques was performed. Vitrectomy was performed in 25 eyes (group 1).

[Subluxation of the lens: etiology and results of treatment].

Objective: To evaluate the indications for surgery, visual results and postoperative complications of pars plana vitrectomy (PPV), in patients with retained lens fragments in the vitreous cavity.

Methods: 86 Eyes from 83 patients who underwent PPV for retained lens fragments at the Hospital Central de Asturias between April 1997 and December 2004 were reviewed. The average age was 68 years (12-90 years).

[Choroidal metastasis from renal cell carcinoma].

Case Report: A fifty-two year-old man who came to our emergency room because of gradual loss of vision in his right eye. He had suffered right nefrectomy for renal cell carcinoma seven years previously and pneumectomy for metastasis in his right lung three months ago. In the fundus examination a choroidal mass was found in his right eye, suggesting metastasis.

[Macular hole surgery with and without internal limiting membrane peeling].

Purpose: To determine if internal limiting membrane (ILM) peeling in idiopathic macular hole surgery improves anatomic and functional results.

Methods: Comparative retrospective, nonrandomized study, of 50 eyes from 48 patients with macular hole, Stage III an IV of the Gass Classification. All of them were operated with the same technique.

[Posterior segment intraocular foreign bodies. Clinical and epidemiological features].

Objectives: To evaluate the epidemiologic factors, associated ocular involvement and visual results in patients with intraocular foreign bodies lodged in the posterior segment.

Methods: In this retrospective study, the clinical records of 21 patients admitted to the hospital with intraocular foreign bodies between August 1994 and March 1998 were reviewed and evaluated in regards to age, gender, type of injury, foreign body nature, need for surgical intervention, complications and final visual acuity.

Results: All the patients were males, with a mean age of 38.