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 추계학술대회 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.

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.

Slide Session : OS-END-15 ; Endocrinology : A Study of Endothelial Dysfunction by Flow Mediated Dilatation of Brachial Artery in Euglycemic & Hyperglycemic Individuals

( Sarath Menon ),( Girish Ramteke ),( Dharmendra Jhavar ),( Manoj Gupta ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Background: Endothelial dysfunction is regarded as an early marker for atherosclerosis & a precursor for future cardiovascular events. Objectives: Study was done to find out endothelial dysfunction (ED) in euglycemic & hyperglycemics. finding any endothelial dysfunction in high risk euglycemic & pre-diabetic individuals and compared degree of ED with different types of hyperglycemia, glycemic parameters & common cardio-vascular (CV) risk factors. MATERIAL & Methods: A cross-sectional, prospective study was done in subjects divided into two groups. First group included hyperglycemic individuals (80) Pre-diabetes( 20), Type1DM(20), Type2 DM (34), clinically labeled MODY(06) and second group included 40 euglycemic individuals. Body mass index, fasting lipid profile, FBS, PPBS, RBS, HbA1c were obtained. Endothelial dependent flow mediated dilatation was assessed with 7.5MHz high resolution ultrasound of brachial artery. A p-value of <0.05 was considered to be statistically significant. Results: Flow mediated dilatation was impaired with increase in age, BMI, lipid profile (p=0.04,0.02,0.02 respectively). FMD was seen inversely related to all glycemic parameters like FBS(r=.680,p=<0.001),PPBS(r=-.660,p=<0.001),RBS(r=.680,p=<0.001), HbA1c(r=-.820,p=<0.001).Flow mediated dilatation was impaired in Pre-diabetes, Type 1 DM,Type2 DM, Clinical MODY, but did not show significant difference between each other (9.03+0.73% vs 8.21+1.18% vs 6.95+2.14% vs 9.4+0.45%,p=0.20) but had significant difference when compared to euglycemics (14.01+3.06%,p=<0.001).FMD was impaired even in high-risk euglycemics(p=0.02) Conclusion: Results showed impaired endothelial function in hyperglycemics and endothelial dysfunction was seen even in Pre-diabetes and in high risk euglycemic individuals, thus showing endothelial damage in these early stages. Endothelial function declined with increase in the severity of glycemic parameters and common CV risk factors. Our study suggested FMD should be considered as a surrogate marker for future cardiovascular events.

Poster Session : PS 0151 ; Neurology : Arnold Chiari with Hemiparesis, Hemisensory Loss with Lower Cranial Nerve Palsy

( Vikas Asatl ),( Girish Bhageshwar Ramteke ),( Vinatak Jatale ),( Vep Prakash Pandey ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

The Chiari I malformation (CMI) is caudal displacement of cerebellar tonsils into cervical spinal-canal. CMI is defi ned by tonsillar herniation more than 5 mm below foramen-magnum, may be congenital or acquired. We are presenting case of Arnold chiari with hemiparesis, hemisensory loss with lower cranial nerve palsy. 50 year male, complaints of tingling, numbness left LL, UL since 7 months, Weakness left LL, UL 6 months, drycough, diffi culty in swallowing, regurgitation of food, headache 3 months. Decubitus -supine position left leg extended laterally rotated, higher functions normal. Trigeminal- there is loss of all sensation modalities on left side of face, Gag refl ex is normal with normal palatal movement, Left side shoulder cannot be raised, power of tongue is slightly decreased on left, resting nystagmus with fast component toward right side. On attempting to see right side nystagmus increases while on seeing to left decreases. Heel-knee, fi nger-nose-test on right side is normal, on left side unable to do due to motor weakness. MRI Brain parenchyma normal. Inferior cerebellar tonsillar herniation in dorsal subarachnoid space extending about 6-7 mm below the posterior arch of atlas-Chiari Malformation type I, Mild indentation is seen on the dorsal surface of upper cervical cord. Minimal inferior displacement of 4th ventricle, no hydrocephalus, no syrinx. Discussion: Chiari malformations consist of varying degree of ectopia of cerebellum. Incidence in MRI is between 0.56% and 0.77%.Type I: Elongation of tonsils and medial parts of the inferior lobes of cerebellum into cone-shaped projections, which accompany medulla oblongata into spinal canal. Type II Displacement of parts of inferior vermis, pons, medulla-oblongata together with elongation of fourth ventricle (most cases with spina bifi da). Type III The entire cerebellum herniates into the cervical canal. Type IV is with Cerebellar hypoplasia.

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.

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 추계학술대회 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 0609 ; Pulmonology ; Reversible Cerebellar Ataxia Following Prolonged Treatment with Metronidazole

( Vikas Asati ),( Girish Bhageshwar Ramteke ),( Ved Prakesh Pandey ),( Ajay Deep Bhatnagar ),( Atul Shende ),( Karuna Mujalda ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Metronidazole, a 5-nitroimidazole is widely used for treatment of anaerobic bacterial, protozoal infections, adverse reactions include nausea, dry-mouth, vomiting, diarrhoea. Neurologic toxicity is rare. We report a rare case of ataxia & cerebellar lesions following therapy with metronidazole, which resolved rapidly after discontinuation of drug. 50- year old male presented with fever, right-hypochondriac pain, diagnosed as multiple liver abscesses, managed initially by drainage-of abscess, intravenous ciprofioxacin, metronidazole for 7 days. He improved, was discharged on oral metronidazole800mg thrice-a-day for 7days. He did not return for followup, but continued medication for next 20 days when he presented with slurring of speech, in-coordination, progressive unsteadiness of gait, subsequent inability to walk. He was alert, oriented, speech dysarthric, horizontal nystagmus 2-3 beats on lateralgaze; no vertical nystagmus, heelto- shin, fi nger-to-nose tests abnormal, power normal. Tone decreased. Refi exes equal. Stance wide-based, felt unsteady, unable to walk without support, sensory normal. MRI Brain-abnormal T2 as well as fiAIR hyperintensities in Dentate nuclei, deep cerebellar parenchyma, splenium of corpus callosum. Serum Metronidazole levels were normal. After discontinuation of metronidazole, patient started regaining ambulatory function was able to walk with-support in 4 days, without-support in 10days. Follow-up MRI at 8 weeks was normal with resolution of hyperintensities of dentatenuclei, cerebellum. Discussion: Cerebellar toxicity is rare adverse-event in patients treated with metronidazole. While proposed mechanism was high cumulative dose in most patients (25-1080 grams), our patient inspite of taking about 75 grams had normal serum Metronidazole levels. Exact mechanism by which Metronidazole causes reversible cerebellar ataxia and Dentate nuclei changes is unclear. Cerebellar toxicity should be considered in any patient who presents with ataxia-dysarthria and is receiving prolonged therapy with metronidazole. MRI should be performed for defi nitive diagnosis and metronidazole withdrawn. Further studies are needed to defi ne the pathogenesis of this unusual event.