Modeling and performance analysis of a small scale direct driven PMSG based wind energy conversion systems

This paper proposes a small scale wind energy conversion system comprising a direct driven PMSG connected to the grid through a power electronic interface. The variable voltage variable frequency output from the wind generator is rectified, boosted and converted in to a fixed voltage fixed frequency output. The boost chopper maintains a constant DC at the inverter terminals. The modulation index of the inverter is adjusted to extract maximum power from the wind. The system components such as wind turbine, PMSG, power electronic interface are modeled in MATLAB/SIMULINK .The power flow analysis of the entire system is carried out for various wind velocities and the effect of duty ratio and modulation index is studied and optimum duty ratio for maximum power extraction at different wind speeds is found out and the simulation results are presented Keywords: wind energy conversion systems, permanent magnet synchronous generator, direct drive

Detection of Malware in Large Networks using Deep Auto Encoders

Data mining and machine learning have been heavily studied in recent years with the purpose of detecting sophisticated malware. The majority of these approaches rely on architectures that do not involve deeply enough into the learning process, despite the fact that they have yielded excellent results. This is because deep learning is finding increasing application in both business and academia thanks due to its skills in feature learning. In this paper, we develop a Deep Auto Encoder (DAE) based detection mechanism to detect the malwares crawling in the large scale networks. The DAE act as an unsupervised deep learning model that helps in detecting the malwares. The simulation is conducted on two different datasets to test the robustness of the model. The results show that the proposed method has higher rate of accuracy in detecting the attacks than other methods

Knowledge And Awareness on Periorbital Hyperpigmentation Among Dental Students

Aim: To analyse the knowledge and awareness of Periorbital hyperpigmentation among dental students. Introduction: In the day to day life, higher education students deal with a lot of stress in their academics. The signs of stress and strain reflect in our body. One of the most encountered signs is periorbital hyperpigmentation(POH), the so-called dark circle. It is evident among the population and it tends to affect the quality of life of patients and their social interactions. The aim of the study is to assess the knowledge and awareness of periorbital hyperpigmentation among higher education students. Materials And Methods: The observational pilot study was carried out in 25 dental students (15 female, 10 male). A well-framed 20 self-structured questionnaire was formed and circulated among the dental students through offline means. Collected responses were tabulated in google sheets and the data was transferred to SPSS software. Statistical analysis was done using the chi square test. P value <0.05 was considered significant. Results: Females were more aware about POH than the males participants. 96% of the students reported sleep deprivation as a triggering factor of Periorbital hyperpigmentation. 76% of the students were well aware that rubbing their eyes often predisposes to POH. The results showed that the dental students possess high knowledge and awareness regarding periorbital hyperpigmentation. Conclusion: Students had a fair idea about periorbital hyperpigmentation and its causes. Further studies can be carried out for better understanding in a different set of larger populations.Saveetha Institute of Medical and Technical Science

Awareness Of Oral Hygiene Among Policemen in Mayiladuthurai

Oral health is inevitably important as that of general health. Besides, The Oral cavity is regarded as ‘The mirror’ of general health as the oral manifestations acts as a delegate of the body’s maladies. Oral hygiene is the habit of maintaining the mouth and teeth clean to get rid of dental problems such as dental caries, gingivitis, and Halitosis. Military (Armed forces, Air forces, Navy forces) and Policing are few of the most challenging occupations. As continual work pressure and stress exists among the police personnel in regulating the law and order, they tend to neglect their General health and also oral health. The aim of the survey based study has been carried out to analyse the oral hygiene practices followed by police personnel in Mayiladuthurai during their stressful lifestyle. This survey consists of 100 policemen. 15 self-administered questionnaires were prepared in google forms and distributed via online means. Descriptive statistics was carried out. Chi square analysis along with correlation was done. The results were expressed in the form of pie charts and bar graphs. This study concluded that there exists a moderate level of awareness regarding oral hygiene practices among the policemen in Mayiladuthurai. Moreover, public healthcare programmes and demonstrations can be held to establish furthermore knowledge about oral hygiene practices

Antibiotic sensitivity pattern to urinary tract infections in a tertiary care hospital in South India

Background: Urinary tract infection (UTI) is one of the most common bacterial illnesses and hence one of the most important indications for antibiotic treatment. Current knowledge of the common organisms implicated in causing UTI in the local community and surveillance to monitor the changes in susceptibility of uropathogens are imperative to ensure appropriate therapy. The study objectives were to assess the proportion of UTI caused by each of the common urinary pathogens, to study the antibiotic drug sensitivity patterns by analyzing the culture and sensitivity reports and to identify the drugs which would be potentially favourable candidates for empirical therapy in the study locale.Methods: This hospital based cross sectional study was done by collecting the data from case records of patients who attended OPD or were admitted with diagnosis of UTI during the study period.Results: Escherichia coli was the single most important cause of UTI, accounting for 70% of the infection among the studied subjects, amongst which 55% was extended spectrum beta-lactamase producing organisms. A pattern of increased susceptibility to higher antibiotics like ertapenem, tigecycline and decreased sensitivity to fluroquinolones was evident. In addition, nitrofurantoin was found to be one of the antibiotics to which most of the organisms were susceptible (85%) favouring its use in empirical therapy of UTI.Conclusions: The pattern of accentuated susceptibility to higher antibiotics in the face of declining trend in the sensitivity to commonly used antibiotics necessitates promoting awareness on the need for rational prescribing of antibiotics among clinicians

Ostéogenèse imparfaite type III de découverte tardive: à propos d’un cas

Patient âgé de 52 ans, était admis dans notre établissement pour des polyarthralgies chroniques, plutôt mécaniques, touchant spécialement lesarticulations du membre inférieur. L’interrogatoire retrouvait l’antécédent de fractures répétées depuis l’enfance, pour des traumatismes minimes,suite à des chutes par glissement. Les signes cliniques et radiologiques, notamment, les fractures récurrentes, sclérotiques bleues, hyperlaxitéligamentaire, dentinogenèse imparfaite, syndrome dysmorphique, ostéoporose densitométrique importante, plaidaient tous en faveur d’uneostéogénèse imparfaite type III. Le patient a initié le traitement, par prise régulière du calcium (1g/jour), supplémentation en vitamine D et il estprogrammé pour perfusion de Bisphosphonate (Pamidronate 60mg). Ce cas illustre une forme rare de découverte tardive d’ostéogénèse imparfaitetype III.Key words: Ostéogenèse imparfaite, fractures, pathologie hétérogène, bisphosphonates, ostéodensitométrie

Heterozygosity for Fibrinogen Results in Efficient Resolution of Kidney Ischemia Reperfusion Injury

Fibrinogen (Fg) has been recognized to play a central role in coagulation, inflammation and tissue regeneration. Several studies have used Fg deficient mice (Fg−/−) in comparison with heterozygous mice (Fg+/−) to point the proinflammatory role of Fg in diverse pathological conditions and disease states. Although Fg+/− mice are considered ‘normal’, plasma Fg is reduced to ∼75% of the normal circulating levels present in wild type mice (Fg+/+). We report that this reduction in Fg protein production in the Fg+/− mice is enough to protect them from kidney ischemia reperfusion injury (IRI) as assessed by tubular injury, kidney dysfunction, necrosis, apoptosis and inflammatory immune cell infiltration. Mechanistically, we observed binding of Fg to ICAM-1 in kidney tissues of Fg+/+ mice at 24 h following IRI as compared to a complete absence of binding observed in the Fg+/− and Fg−/− mice. Raf-1 and ERK were highly activated as evident by significantly higher phosphorylation in the Fg+/+ kidneys at 24 h following IRI as compared to Fg+/− and Fg−/− mice kidneys. On the other hand Cyclin D1 and pRb, indicating higher cell proliferation, were significantly increased in the Fg+/− and Fg−/− as compared to Fg+/+ kidneys. These data suggest that Fg heterozygosity allows maintenance of a critical balance of Fg that enables regression of initial injury and promotes faster resolution of kidney damage

Fast-cure ionogel electrolytes with improved ion transport kinetics at room temperature

Fast-cure 1-ethyl-3-methylimidazolium trifluoromethanesulfonate-based ionogels have been realised for the first time. The influence of curing temperature on the structure of ionogels and their performance as the electrolyte for electric double-layer capacitors (EDLCs) has been investigated. Hybrid ionogels were synthesised via a non-hydrolytic sol-gel route and were fully gelled post heat-treating at 125, 150, 175 and 200 °C for 60 min with minimal shrinkage. Charge-transfer resistance (a rate-limiting parameter in cell kinetics during charge/discharge cycles) was reduced by ∼80% by increasing the heat-treatment temperature; this was partially attributed to the interlocking effect facilitated by high curing temperature. We report a maximum areal capacitance of 95 mF cm−2. Due to ∼40% increase in the penetrability coefficient of the ionic liquid, the electrode ‘full’ wetting time dropped from 48 to 5 h when the curing temperature was increased above 150 °C. These results were supported by SEM and Raman spectroscopy to characterise the effect of high temperature heat-treatment on the electrode-ionogel interface and the degree of electrode wetting by the ionic liquid. The fast-cure fabrication process for ionogels removes one of the major hurdles in their industrial application while the improved room temperature ion transport kinetics expands the potential application of ionic liquid-based electrochemical systems