136 research outputs found

    Modelling of a High Temperature Solid Oxide Fuel Cell

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    Solid oxide fuel cell (SOFC) has been considered as one of the most efficient power generation devices for the coming decades. There are various physical phenomena appearing in SOFC in multi-length and -time scales, such as multi-component gas-phase species/charge flow, thermal energy and mass transfer. Meanwhile, generation and consumption of gas and surface phase species together with electric current production are involved at various active sites of different components of SOFC.In this paper, a numerical study of the thermal and electrochemical performance of a single Integrated Planar Solid Oxide Fuel Cell (IP-SOFC) has been performed. The numerical modelling considers internal reforming through the methane reforming and water gas shift reactions in a Ni-YSZ anode. Next to the description of the electrochemical reactions, the methane/steam reforming and shift reactions, the heat-transfer and the mass-transfer processes have also been included in the model. Keywords: Solid oxide fuel cell (SOFC), Integrated Planar Solid Oxide Fuel Cell (IP-SOFC), internal reforming, methane reforming, water gas shift

    Childhood Obstructive Sleep Apnea

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    Obstructive sleep apnea (OSA) is a common condition in childhood and can result insevere complications if left untreated. It is showing a rising trend in India. A significantassociation with obesity has been observed; however, some children with enlargedtonsils and/or adenoids may even be underweight. The patient usually presents withsnoring and other respiratory problems like mouth breathing, choking and gaspingepisodes in night. Poor school performance and neurocognitive deficits have beenreported. Pulmonary hypertension and cor pulmonale are seen in severe cases. Besidesthe history and clinical examination, for definitive diagnosis an overnightpolysomnographic evaluation is the gold standard. In all cases, the specific treatmentranges from simple lifestyle modifications and medications to surgeries likeadenotonsillectomy. Early diagnosis is vital.Key words: Childhood OSA, Obesity, adenotonsillar hypertroph

    Abdominal Cyst in a 39-year-old Woman

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    A 39-year-old premenopausal woman presented with complaints of persistent pain in her lower abdomen lasting one year. She had history of exploratory laparotomy two years prior for tubercular pyoperitoneum. She completed her course of antitubercular medication and remained asymptomatic in the intervening period (around 10 months)

    May-Thurner syndrome causing venous thromboembolism in a young female with Sturge weber syndrome and connective tissue disease

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    May-Thurner syndrome (MTS) is a rare condition characterized by the compression of the left common iliac vein by the overlying right common iliac artery. It is a unique causal reason for development of deep venous thrombosis (DVT) and pulmonary embolism (PE). Young females developing DVT should be examined and investigated with details as triggers can include trauma, pregnancy, autoimmunity. In this case report we report a case of a young female who had Sturge Weber Syndrome, and how a left hip pain was diagnosed as DVT which led to diagnosis of an underlying MTS and autoimmune trigger for her hypercoagulable state

    Fatigue behavior of aluminium alloy

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    The present project deals with study of fatigue life of Aluminium alloy treated at two different temperatures. This temperature is above and below the recrystallisation temperature of Aluminium alloy. The specimen is commercially available Aluminium alloy which is annealed, tensile testing is done and then fatigue life of the specimen is determined. Failure of the specimen at different stress applied is determined and number of cycles to failure is noted. Fatigue has become progressively more prevalent as technology has developed a greater amount of equipment, such as automobiles, aircraft, compressors, pumps, turbines, etc., subject to repeated loading and vibration. A fatigue failure can usually be recognized from the appearance of the fracture surface, which shows a smooth region, due to the rubbing action. In our experiment we have done the annealing of aluminum alloy above and below recrystallisation temperature in the recovery range. The tensile testing of the specimen was done in INSTRON 1195. The results obtained from this test says that yield strength of the aluminum alloy was found to be more below recrystallisation temperature then that above recrystallisation temperature. The failure of the specimen here occurs at a very large number of cycles. This of the order of 10 5.this number of cycles decreases with an increase in the applied stress. As the load increases the failure of the specimen would occur at a less number of cycles. This alloy used fails at a large number of cycles. Also no endurance limit is obtained here. So for use of this alloy large number of cycles is required and also a lower yield stress. This aluminum alloy can be used for a large number of uses. Aircraft application, gas pipelines, oil tanks, pistons, etc

    Indian Diabetes Risk Score (IDRS) as a strong predictor of diabetes mellitus: A cross sectional study among urban population of Jhalawar, Rajasthan

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    Introduction: The patients with Type 2 diabetes Mellitus may often remain asymptomatic for a longer period of time. The Indian Diabetes Risk Score (IDRS), a simple screening tool for prediction of undiagnosed diabetes. Objective: Validation of IDRS with standard test for type 2 diabetes among urban population of Jhalawar, Rajasthan. Material and Methods: A Community based Cross-sectional study was carried out in urban field practice area of Department of Community Medicine, Jhalawar Medical College, Jhalawar, Rajasthan. The study was conducted using a two-stage sampling design. A predesigned, pretested proforma and Indian Diabetes Risk Score (IDRS) sheet was used to collect data from the study participants. The IDRS is based on four parameters: age, family history of diabetes, waist circumference and physical inactivity. Data was collected using the World Health Organization stepwise approach to surveillance (STEPS). Results: Among 450 participants, 12.7% participants were in low risk, 59.1% were in moderate risk and 28.2% were in high risk of developing diabetes according to IDRS score. IDRS score of ?60 turned out to be the best cut point for identifying undiagnosed diabetes with sensitivity 92.3% and specificity 82.6%. Positive Predictive value and Negative Predictive value were 47.3% and 98.5% respectively. Conclusion: Association of IDRS was found significant with diabetes. IDRS score of ?60 turned out to be the best cut point for identifying undiagnosed diabetes. IDRS is found valid screening tool for early detection of Diabetes