Impedance spectroscopy study of zinc oxide incorporated iron borate glass-ceramic

Ramteke Rajat,Kumari Kalpana,Bhattacharya Soumalya,Sharma Sanjeev Kumar,Rahman M.R. 한국물리학회 2021 Current Applied Physics Vol.22 No.-

Here, the effects of zinc oxide (ZnO) on impedance and dielectric properties of the ZnO incorporated iron borate (Fe3BO6) glass-ceramics were studied using impedance spectroscopy in a wide range of frequency (1 Hz – 1 MHz) and temperature (25 ◦C–250 ◦C). With ZnO addition, the ε′ and tanδ values were reduced significantly, the strength of the relaxation process also decreased, along with a decrease in conductivity. Activation energies associated with modulus and conductivity plots suggest that similar type of charge carriers was responsible for the relaxation and conduction processes. The analysis of both complex impedance and conductivity show the negative temperature coefficient of resistance (NTCR) behavior of the samples. The thermistor constant B-values of 5ZnO and 10ZnO were found to be 7223 and 7088 respectively. The study of the NTCR properties suggests a potential candidate for thermistor applications.

Poster Session : PS 0128 ; Cardiology : Case Report - An Unusual Association of Mitral Stenosis with Diffuse Systemic Sclerosis

( Girish Ramteke ),( Sanjay Dubey ),( Neeraj Dayani ),( Mridulata Prajapati ),( Paridhi Shivde ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1

Introduction: Disorders of collagen tissue are caused by humoral and cellular mediated immune responses mediated by cytokines like TGF ß, TNF a etc. The various disease manifestations include mixed connective tissue diseases, rheumatoid arthritis, sjogren`s syndrome, systemic sclerosis etc. One of the associations is that of cardiac valvesstenotic lesion-though extremely rare. We report one such rare case. Case presentation: 60 year old female presented with a history of tightness of skin, contractures of fingers, inability to open mouth and pitting scars over the tip of digits. There was no history of breathlessness. There is a history of rheumatic heart disease-mitral stenosis-open mitral valvulotomy 7 years ago. On evaluation she had features suggestive of Mauskopf`s facies, microstomia and other features of systemic sclerosis and the ACR criteria suggested systemic sclerosis. Modified Rodnan skin thickness score was 43 out of 51. Her Antiscl-70 antibody was positive and skin biopsy showed dermal sclerosis. HRCT chest showed- septal thickening with ground glass appearance. Though the patient was asymptomatic her echo revealed chordal shortening, cuspal retraction which was an additional feature compared to earlier echo 7 years ago. This association of valvular involvement in systemic sclerosis is an extremely rare association with only 5 cases reported in literature. Conclusion: Association of valve- stenotic has been very rarely associated with collagen disease like systemic sclerosis; though other collagenous tissues of the body are involved cardiac valves are generally spared. With only 5 cases reported in the literature we report one such case of this rare association where in an initially affected and treated mitral valve due to rheumatic heart disease has been now involved due to systemic sclerosis.

Sirolimus-induced leukocytoclastic vasculitis

Vishal Ramteke,Sainath Pattewar,Nitin Barde,Nishant Deshpande 대한이식학회 2023 Korean Journal of Transplantation Vol.37 No.4

Automated gear fault detection of micron level wear in bevel gears using variational mode decomposition

Dada Saheb Ramteke,Anand Parey,Ram Bilas Pachori 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.12

Gearboxes have an important role in power transmission systems. For such systems, vibration-based fault diagnosis techniques are frequently used to prevent premature failure and to ensure smooth transmission. We automated the fault diagnosis of gears having level of wear fault at micron using variational mode decomposition (VMD). VMD has been applied iteratively with specific input parameters. VMD decomposes the gear vibration signal into different narrowband components (NBCs) or obtained components (OCs). Various statistical features, namely kurtosis, skewness, standard deviation, root mean square, and crest factor, were extracted from the different OCs. Kruskal-Wallis test based on probability values was used to identify the significant features. For the automation of fault detection system, a comparative study was done using the random forest, multilayer perceptron, and J48 classifiers. The proposed method exhibits 96.5 % accuracy using random forest classifier with combined kurtosis, skewness, and standard deviation features.

Treatment of toluene, benzene, naphthalene and xylene (BTNXs) containing wastewater using improved biological oxidation with pretreatment using Fenton/ultrasound based processes

Lokeshkumar P. Ramteke,Parag R. Gogate 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-

Improved biological oxidation based on pretreatment using combined Fenton and ultrasound inpresence of stirring as the best approach and use of modified activated sludge was demonstrated for thetreatment of wastewater containing benzene, toluene, naphthalene and o-xylene. The optimumpretreatment conditions were observed as initial pH of 3–3.5, Fe2+ dosage of 2.0 g L–1 and H2O2 dosage of1.0 g L–1 giving about 80–95% reduction in the chemical oxygen demand (COD) and favorable BOD5/CODvalue for the biological oxidation. Use of modified prepared activated sludge gave about 20–30% higherextent of degradation as compared to the conventional sludge types.

Effect of grading pattern and porosity on the eigen characteristics of porous functionally graded structure

Prashik Malhari Ramteke,Subrata K. Panda,Nitin Sharma 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.33 No.6

The current article proposed to develop a geometrical model for the analysis and modelling of the uniaxial functionally graded structure using the higher-order displacement kinematics with and without the presence of porosity including the distribution. Additionally, the formulation is capable of modelling three different kinds of grading patterns i.e., Power-law, sigmoid and exponential distribution of the individual constituents through the thickness direction. Also, the model includes the distribution of porosity (even and uneven kind) through the panel thickness. The structural governing equation of the porous graded structure is obtained (Hamilton's principle) and solved mathematically by means of the isoparametric finite element technique. Initially, the linear frequency parameters are obtained for different geometrical configuration via own computer code. The comparison and the corresponding convergence studies are performed for the unidirectional FG structure for the validation purpose. Finally, the impact of different influencing parameters like aspect ratio (O), thickness ratio (S), curvature ratio (R/h), porosity index (λ), type of porosity (even or uneven), power-law exponent (n), boundary condition on the free vibration characteristics are obtained for the FG panel and discussed in details.

Poster Session : PS 0314 ; Hematology : Acute Psychosis: A Presentation of Cyanocobalamin Defi ciency Megaloblastic Anemia

( Anurag Bahekar ),( Girish Bhageshwar Ramteke ),( Sanjay Dubey ),( Amith R ),( Ankit Meshram ),( Amit Agarwal ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1

Mental disturbances due to vitamin B12 deficiency have been reported previously as chief or sole symptoms, occasionally even preceding decrease of cobalamin in serum. Frank psychosis related to vitamin B12 defi ciency is considered very rare and has received little attention. We report a 28 yrs young female presenting with acute psychosis due to cyanocobalamine deficiency which reversed with treatment. Presentation was irrelevant talking, picking of clothes, inability to recognize people for 3 days. No fever, headache, vomiting, weakness, head trauma, drug intake, stressor or addiction. No past major illness, psychiatric illness or memory loss. Pt. had weaknes easy fatigability since 2 years was on vegetarian diet. Bladder bowel habits were regular. Hb 2. 9 gm/dl, thrombocytopenia 1 lakh/cumm, normal leucocytes, MCV-142. 7 fi , smear showed dimorphic picture, pencil cells, tear drop cells, anisopoikilocytosis, hypersegmented neutrophils. Diagnosis of megaloblastic anemia was made. CSF, CT head, electrolytes were normal. B12 level 77. 12 pmol/l (N200-800 pmol/l). Endoscopy- atrophic gastritis. Histology-atrophic gastriris. Antiparietal cell antibody-negative. Patient recovered fully within 3 days therapy with Inj. cyanacobalamin 1000 microgm i. m. with no need of antipsychotics at discharge. Biermer`s disease, also called acquired pernicious anemia, disorder of vitamin B12 absorption characterized by megaloblastic anemia, gastrointestinal symptoms, can lead to neurological abnormalities. Frequent in elderly, less in adults(15%), extremely rare inchildren, adolescents. It is asymptomatic for years, non-specifi c symptoms of anemia, atrophic gastritis. Possible mechanism for psychotic behaviour suggested by Hutto, reported cobalamin and folate participate in synthesis of monoamine neurotransmitters in brain by increasing BH4(tetrahydrobiopterin) synthesis. Treatment:Oral administration of high-dose vitamin B(12) (1-2 mg daily) as effective as intramuscular administration in correcting defi ciency. We recommend consideration be given to B-12 defi ciency as an etiological possibility in some cases of depression, organic psychosis, certain childhood-disorders and dementia.

Poster Session:PS 0193 ; Endocrinology : Carbimazole Induced Cholestatic Jaundice in Toxic Multinodular Goitre

( Amith R ),( Girish Ramteke ),( Dharmendra Jhavar ),( Lalan Pratap Singh ),( Anu Daber ),( Manoj Gupta ),( Nd Punjabi ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1

Antithyroid drugs are used to treat toxic multinodular goitre(TNG). Carbimazole is usually the drug of choice except in pregnancy where propylthiouracil is used. It is well tolerated and common side effects include allergy, upper GI upset, rarely agranulocytosis. Hepatitis is rare but serious complication.We report a 55yr female with TNG, who developed cholestatic hepatitis after carbimazole therapy for 2 months. She recovered completely following withdrawal of the drug.Toxic multinodular goitre (Plummer`s disease) is a 2nd most common cause for hyperthyroidism after Grave`s disease, 15-30% cases, (>50 years) and women. Unlike Grave`s disease which is autoimmune and antithyroids are started universally, TNG is not known to recur after therapy. So surgery or radioiodine are treatment of choice. Antithyroids are used for symptomatic relief in patients waiting surgery. Side effects are mild, include allergic reactions, upper GI intolerance, agranulocytosis, vasculitis-like reaction particularly propylthiouracil. Hepatotoxicity is rarebut serious side-effect with both carbimazole and propylthiouracil (PTU). Histology with PTU shows toxic hepatitis &necrosis and it is cholestatic hepatitis with carbimazole. Our case demonstrates carbimazole induced cholestatic hepatitis in patient with TNG. Clinical,biochemical fi nding with relevant review of literature is presented. Patient was put on propranolol, prednisolone in the interim for her thyrotoxicosis and exophthalmosis. Liver function tests improved signifi cantly following stoppage of carbimazole. The high degree of alkaline phosphatase could also be due to effect of hyperthyroidism on bone resorption. She is currently euthyroid. In summary, jaundice as a complication of thionamide treatment of hyperthyroidism is rare, this complication cannot be predicted by deranged liver enzymes at presentation, but typically occurs within three months of therapy, it can be fatal, particularly when there are additional hepatotoxic factors, and the drug must be withdrawn immediately and alternative therapy, such as radioiodine must be considered in appropriate patients.

Poster Session : PS 0152 ; Neurology : Subacute Sclerosing Pan Encephalitis(SSPE): A Rare Presentation

( Amith Ram ),( Bhageshwar Girish Ramteke ),( Anjali Matani ),( Apoorva Paurank ),( Archana Verma ),( Anurag Bahekar ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1

Subacute Sclerosing Pan-Encephalitis is a prototype neurodegenerative disease of childhood characterised by onset of neurological symptoms between 5 and 15 years of age with a progressive downhill course and death within 2-4 years. Incidence of adult onset SSPE has been reported between 1-1.75% and 2.6%. To-date less than 140 cases of adult onset SSPE have been published, the majority being case reports. A 24 year old male presented with progressive neurological syndrome characterised by very frequent myoclonic jerks associated with brief dystonic posturing of upper limbs for 8 months. No history of seizures, cognitive decline or personality changes, no history-of measles in childhood but immunized. Routine blood investigations normal. EEG-periodic complexes, CSF- mild increase in proteins, normal sugar, cell count. Measles antibody titre elevated, serum as well as CSF levels, CSF/serum antibody quotient 2.62 which was strongly suggestive of SSPE. Other antibody titres were unremarkable. MRI-bilateral & near symmetrical T2 hyperintense signal in posterior putamen, slightly larger on right, restriction of diffusion & are hypo on T1. No cortical or white matter changes seen. Our patient is not classical case of SSPE. Atypical for age, late-onset, qualifi es as adult-onset of SSPE (defi ned onset after 18 years), well preserved cognition. He did not have seizures, spasticity or visual complaints which are common. Imaging fi ndings are also atypical as common fi ndings early in disease are white matter changes and cortical atrophy mainly in the posterior region of brain and the hyperintense signals seen in late course of the disease are seen early in this patient. EEG Stereotyped periodic complexes with normal background and is strongly suggestive SSPE. MRI reveals T2 hyperintense lesions in bilateral putaminal region slightly larger on right side. Treatment: No curative-therapy is available, few disease-modifying agents have been tried which may delay progression.

Current Controlled PWM for Multilevel Voltage-Source Inverters with Variable and Constant Switching Frequency Regulation Techniques: A Review

Gawande, S.P.,Ramteke, M.R. The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.2

Due to advancements in power electronics and inverter topologies, the current controlled multilevel voltage-source pulse width modulated (PWM) inverter is usually preferred for accurate control, quick response and high dynamic performance. A multilevel topology approach is found to be best suited for overcoming many problems arising from the use of high power converters. This paper presents a comprehensive review and comparative study of several current control (CC) techniques for multilevel inverters with a special emphasis on various approaches of the hysteresis current controller. Since the hysteresis CC technique poses a problem of variable switching frequency, a ramp-comparator controller and a predictive controller to attain constant switching frequency are described along with its quantitative comparison. Furthermore, various methods have been reviewed to achieve hysteresis current control PWM with constant switching frequency operation. This paper complies various guidelines to choose a particular method suitable for application at a given power level, switching frequency and dynamic response.