Papers by harsha anantwar
Range Estimation of Electric Vehicle Using Matlab Simulink Model
Implementation of a Battery Charging System with Overcharging Protection using Arduino
Journal of Asian Energy Studies
Hybrid off-grid power systems with different renewable and non-renewable energy sources, such as ... more Hybrid off-grid power systems with different renewable and non-renewable energy sources, such as wind, photovoltaics, and diesel generation, have a wide application scope in regions where grid extension is not possible. To supply quality power, hybrid off-grid power systems need proper reactive power management to deal with randomly changing load and supply. In particular, to realize dependable and quality power supply, hybrid off-grid power systems require suitable and efficient control techniques. A properly tuned controller of reactive power sources is crucial to maintain a prescribed voltage profile. Computational intelligence techniques such as particle swarm optimization can provide desired and acceptable solutions for optimization problems. In this study, we applied computational intelligent techniques for optimal control of reactive power sources, such as photovoltaic inverters and automatic voltage regulators for synchronous generators in diesel engines, to investigate dyna...
International Journal of Engineering and Advanced Technology, 2020
This paper features an effective technique to device the parameters of PID controllers for utiliz... more This paper features an effective technique to device the parameters of PID controllers for utilization together with an Automatic Voltage Regulator System (AVR). The quintessential goal is to acquire a good load disturbance response by minimizing the performance index/(Integral time square error). Simultaneously, the transient response is assured by limiting maximum overshoot, settling time and rise time of the step response to minimal values. For achieving these goals, optimum and quick tuning of the parameters (Kp, Ki, and Kd) is essential. In an effort to accomplish the aforementioned, the paper put forth an algorithm developed based on the Ant Colony Optimization technique (ACO) to decide optimal gains of PID controller and for getting optimal performance within an AVR system. Simulation results establish superior control response may be accomplished in comparison with methods like conventional tuning method (trial and error) and built-in genetic algorithm (GA) took-kit.e.
Energy Procedia, 2017
District heating networks are commonly addressed in the literature as one of the most effective s... more District heating networks are commonly addressed in the literature as one of the most effective solutions for decreasing the greenhouse gas emissions from the building sector. These systems require high investments which are returned through the heat sales. Due to the changed climate conditions and building renovation policies, heat demand in the future could decrease, prolonging the investment return period. The main scope of this paper is to assess the feasibility of using the heat demand-outdoor temperature function for heat demand forecast. The district of Alvalade, located in Lisbon (Portugal), was used as a case study. The district is consisted of 665 buildings that vary in both construction period and typology. Three weather scenarios (low, medium, high) and three district renovation scenarios were developed (shallow, intermediate, deep). To estimate the error, obtained heat demand values were compared with results from a dynamic heat demand model, previously developed and validated by the authors. The results showed that when only weather change is considered, the margin of error could be acceptable for some applications (the error in annual demand was lower than 20% for all weather scenarios considered). However, after introducing renovation scenarios, the error value increased up to 59.5% (depending on the weather and renovation scenarios combination considered). The value of slope coefficient increased on average within the range of 3.8% up to 8% per decade, that corresponds to the decrease in the number of heating hours of 22-139h during the heating season (depending on the combination of weather and renovation scenarios considered). On the other hand, function intercept increased for 7.8-12.7% per decade (depending on the coupled scenarios). The values suggested could be used to modify the function parameters for the scenarios considered, and improve the accuracy of heat demand estimations.
IJARCCE, 2015
In order to supply the power from photovoltaic system or solar panel at a low voltage to a grid a... more In order to supply the power from photovoltaic system or solar panel at a low voltage to a grid at high voltage, a power electronic converter is required which must be capable of both voltage boosting and inversion. Newly introduced Switched boost inverter is a single stage dc-ac power converter whose output voltage can be either greater or less than its input dc voltage and is capable of achieving both these objectives. This converter can supply both ac and dc loads simultaneously which makes it suitable for micro grid applications. This converter allows the switching shoot through switching state of the inverter legs for boosting the input voltage and compensates the dead time effects and avoid the risk of damaging the converter. In this paper principle of operation of switched boost inverter is explained in detail. Also pulse width modulation control strategy for switched boost inverter is formulated and implemented using simple analog circuit.
Covid-19 : et notre monde se referma comme une huître…
Revue Médicale Suisse, 2020
Skill mix", rien de nouveau soul le soleil
[Travelers' exposure to HIV and HIV-infected travelers]
Revue medicale suisse, 2018
In Switzerland, 20 % of the population travel to the tropics every year and many have unprotected... more In Switzerland, 20 % of the population travel to the tropics every year and many have unprotected sexual practices during their stay. A third of newly diagnosed HIV infections among Swiss citizens are acquired abroad. Travel clinics are probably important partners in the fight against sexually transmitted infections and HIV. People living with HIV often travel to the tropics but rarely attend a travel clinic before leaving. Travels are a risk factor of HIV viral rebound and antiretroviral treatment failure, particularly in sub-Saharan African patients. Pre-travel counselling should be part of a usual follow-up medical consultation with a focus on treatment adherence.
Forum Médical Suisse ‒ Swiss Medical Forum, 2011
PLOS ONE, 2018
Background Quick Sequential Organ Failure Assessment (qSOFA) is a three-item clinical instrument ... more Background Quick Sequential Organ Failure Assessment (qSOFA) is a three-item clinical instrument for bedside identification of sepsis patients at risk of poor outcome. qSOFA could be a valuable triage tool in emergency departments of low-income countries, yet its performance in resource-limited settings remains unknown. The prognostic accuracy of qSOFA for 28day all-cause mortality in febrile adults treated at the EDs in a low-income country was evaluated. Methods Retrospective analysis of a prospective cohort study of consecutive patients (!18 years) with fever (tympanic temperature !38˚C and fever 7 days) who presented between July 2013 and May 2014 at four emergency departments in Dar es Salaam, Tanzania. Medical history, clinical examination, laboratory and microbiological data were collected to document the cause of fever. Variables for the previous and new sepsis criteria were collected at inclusion and qSOFA, SOFA and SIRS were measured at inclusion. Patients were followed up by phone at day 28. The performance (sensitivity, specificity and area under the receiver operating curve [AUROC]) of qSOFA (score !2), SOFA (increase of !2 points) and SIRS (!2 criteria) as predictors of 28-day all-cause mortality was evaluated. Results Among the 519 patients (median age: 30 years) included in the analysis, 47% were female and 25% were HIV positive. Overall, 85% had a microbiologically and/or clinically PLOS ONE |
The American Journal of Tropical Medicine and Hygiene, 2007
Increasingly, families travel to tropical destinations exposing them to infectious agents and tro... more Increasingly, families travel to tropical destinations exposing them to infectious agents and tropical diseases not encountered at h~n;e. We studied 157 children (0-16 years). and the!r adult relatives traveling to the tropics, who attended a pretravel chmc and were generally adherent to prescnbed adv1ce. Incidence rates of common illness in child.ren an? adults were respectively 16.9 (14.3-19.7) and 15.1 (12.7-17.8) episodes/100 person-weeks. Diarrhea, abdommal pam, and fever were the most frequent complaints. There was no significant difference in the incidence of morbid episodes between children and adults, except for fever (more frequent in children). Most episodes occurred in the first 10 days of travel. The similar incidence of morbidity in children and adults and the episodes' mildness challenge the view that it is unwise to travel with small children.
The American Journal of Tropical Medicine and Hygiene, 2007
Because of increasing resistance to 4-aminoquinolines in Papua New Guinea, combination therapy of... more Because of increasing resistance to 4-aminoquinolines in Papua New Guinea, combination therapy of amodiaquine (AQ) or chloroquine (CQ) plus sulfadoxine-pyrimethamine (SP) was introduced as first-line treatment against uncomplicated malaria in 2000. The purpose of this study was to monitor in vivo efficacy of the current standard combination therapy against Plasmodium falciparum and P. vivax malaria. Studies were conducted between 2003 and 2005 in the Simbu, East Sepik, and Madang Provinces in Papaua New Guinea according to the revised protocol of the World Health Organization (WHO) for assessment of antimalarial drug efficacy. Children between six months and seven years of age with clinically overt and parasitologically confirmed P. falciparum or P. vivax malaria were treated according to the new policy guidelines (i.e., AQ plus SP given to patients weighing < 14 kg and CQ plus SP given to patients weighing Ն 14 kg). Children were monitored up to day 28 and classified according to clinical and parasitological outcome as adequate clinical and parasitological response (ACPR), early treatment failure (ETF), late clinical failure (LCF), or late parasitological failure (LPF). For P. falciparum malaria, polymerase chain reaction (PCR)-corrected treatment failure rates up to day 28 ranged between 10.3% and 28.8% for AQ plus SP and between 5.6% and 28.6% for CQ plus SP, depending on the region and the year of assessment. Overall treatment failure rate with AQ or CQ plus SP for P. vivax malaria was 12%. Our results suggest that the current first-line treatment in Papua New Guinea is not sufficiently effective. According to the new WHO guidelines for the treatment of malaria, a rate of parasitological resistance greater than 10% in the two dominant malaria species in the country justifies a change in treatment policy.
Journal of Travel Medicine, 2017
Aktuelle Änderung der Gelbfieberempfehlung
BMC health services research, 2015
The impact of the Integrated Management of Childhood Illness (IMCI) strategy has been less than a... more The impact of the Integrated Management of Childhood Illness (IMCI) strategy has been less than anticipated because of poor uptake. Electronic algorithms have the potential to improve quality of health care in children. However, feasibility studies about the use of electronic protocols on mobile devices over time are limited. This study investigated constraining as well as facilitating factors that influence the uptake of a new electronic Algorithm for Management of Childhood Illness (ALMANACH) among primary health workers in Dar es Salaam, Tanzania. A qualitative approach was applied using in-depth interviews and focus group discussions with altogether 40 primary health care workers from 6 public primary health facilities in the three municipalities of Dar es Salaam, Tanzania. Health worker's perceptions related to factors facilitating or constraining the uptake of the electronic ALMANACH were identified. In general, the ALMANACH was assessed positively. The majority of the res...
[Travel, globalization and access to health care]
Revue médicale suisse, Jan 10, 2006
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Papers by harsha anantwar