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Investigation on thermally aged natural ester oil for real-time monitoring and analysis of transformer insulation

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High Voltage 2020年第2期5卷 209-217页

作者： Arputhasamy Joseph Amalanathan Ramanujam Sarathi Swayam Prakash ashok kumar mishra Ribhu Gautam Ravikrishnan Vinu Department of Electrical Engineering Indian Institute of Technology MadrasChennai 600036India Department of Chemistry Indian Institute of Technology MadrasChennai 600036India Department of Chemical Engineering Indian Institute of Technology MadrasChennai 600036India

Thermal aging of natural ester oil shows drastic reduction in partial discharge inception voltage(PDIV)and a significant variation is observed only above a certain aging time,under AC,DC,high frequency AC voltages and with harmonic voltages with different total harmonic *** distribution studies on PDIV measurements indicate a reduction in scale parameter(α)with increase in thermal aging temperature.A characteristic reduction in breakdown voltage was observed with the thermally aged ester oil,under AC,DC and standard lightning impulse *** breakdown voltage variation with aged ester oil follows normal ***(UV)analysis of ester oil thermally aged at 160°C has revealed a regular shift of the derived absorbance parameter to longer *** interfacial tension and turbidity exhibits an inverse relationship with the thermally aged ester *** chromatography/mass spectrometric analysis of the thermally aged ester oil predicted the formation of more carboxylic acids and ketones with aging *** steady-state fluorescence on thermally aged ester oil exhibits a shift in its emission profile,which is in tandem with the UV absorption spectroscopic *** analysis can be adopted as a real-time monitoring tool in transformers,to understand the condition of liquid *** viscosity dependence on the wavelength of derivative absorption maxima follows a direct relationship with the thermally aged natural ester oil.

关键词： temperature thermally insulation

Practice patterns among ophthalmic surgeons in treating concomitant oculoplastic conditions in preoperative period:A questionnaire-based study

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World Journal of Clinical Cases 2025年第1期13卷 29-37页

作者： Bijnya Birajita Panda Chitaranjan mishra Bhagabat Nayak Avik kumar Roy Logesh Balakrishnan Priyadarshini mishra Department of Ophthalmology All India Institute of Medical SciencesBhubaneswar 751019OdishaIndia Department of Vitreo-Retina Trilochan NetralayaSambalpur 768004India Department of Glaucoma Services LV Prasad Eye InstituteBhubaneswar 751013India Department of Statistics Apollo HospitalsChennai 823104India

BACKGROUND Addressing oculoplastic conditions in the preoperative period ensures both the safety and functional success of any ophthalmic *** oculoplastic conditions,like nasolacrimal duct obstruction,have been extensively studied,whereas others,like eyelid malposition and thyroid eye disease,have received minimal or no *** To investigate the current practice patterns among ophthalmologists while treating concomitant oculoplastic conditions before any subspecialty ophthalmic *** A cross-sectional survey was disseminated among ophthalmologists all over *** survey included questions related to pre-operative evaluation,anaesthetic and surgical techniques preferred,post-operative care,the use of adjunctive therapies,and patient follow-up *** A total of 180 ophthalmologists responded to the *** practitioners(89%)felt that the ROPLAS test was sufficient during pre-operative evaluation before any subspecialty surgery was *** most common surgical techniques employed were lacrimal drainage procedures(Dacryocystorhinostomy)(63.3%),eyelid malposition repair(36.9%),and ptosis repair(58.7%).Post-operatively,47.7%of respondents emphasized that at least a 4-week gap should be maintained after lacrimal drainage procedures and eyelid ***-seven percent of ophthalmologists felt that topical anaesthetic procedures should be preferred while performing ocular surgeries in thyroid eye disease *** Approximately 50%of ophthalmologists handle prevalent oculoplastic issues themselves,seeking the expertise of an oculoplastic surgeon under particular *** ophthalmologists still favor using ROPLAS as a preliminary screening method before proceeding with cataract *** conditions and thyroid eye disease are not as commonly addressed before subspecialty procedures compared to issues like nasolacrimal duct obstruction and periocular infections.

关键词： Oculoplasty Ophthalmic plastic surgery Nasolacrimal duct obstruction Practice patterns Survey

Comparative study on machinability improvement in hard turning using coated and uncoated carbide inserts： part II modeling, multi-response optimization, tool life, and economic aspects

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Advances in Manufacturing 2018年第2期6卷 155-175页

作者： Ramanuj kumar ashok kumar Sahoo Purna Chandra mishra Rabin kumar Das School of Mechanical Engineering Kalinga Institute of Industrial Technology Bhubaneswar-24 Odisha India

The present study focused on mathematical modeling, multi response optimization, tool life, and eco- nomical analysis in finish hard turning of AISI D2 steel （（55 4- 1） HRC） using CVD-coated carbide （TiN/TiCN/ A1203） and uncoated carbide inserts under dry environ- mental conditions. Regression methodology and the grey relational approach were implemented for modeling and multi-response optimization, respectively. Comparative economic statistics were carried out for both inserts, and the adequacy of the correlation model was verified. The experimental and predicted values for all responses were very close to each other, implying the significance of the model and indicating that the correlation coefficients were close to unity. The optimal parametric combinations for A1203 coated carbide were dl-fl-v2 （depth of cut = 0.1 mm, feed = 0.04 mm/r and cutting speed = 108 m/min）, and those for the uncoated tool were dl-（0.1 mm）-fl （0.04 mm/r）-vl （63 rn/min）. The observed tool life for the coated carbide insert was 15 times higher than that for the uncoated carbide insert, considering flank wear criteria of 0.3 mm. The chip volume after machining for the coated carbide insert was 26.14 times higher than that of the uncoated carbide insert and could be better utilized for higher material removal rate. Abrasion, diffusion, notch- ing, chipping, and built-up edge have been observed to be the principal wear mechanisms for tool life estimation. Use of the coated carbide tool reduced machining costs by about 3.55 times compared to the use of the uncoated carbide insert, and provided economic benefits in hard turning.

关键词： Machinability Hard turning Regression Grey relational analysis Tool life Economic analysis

Comparative investigation towards machinability improvement in hard turning using coated and uncoated carbide inserts： part Iexperimental investigation

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Advances in Manufacturing 2018年第1期6卷 52-70页

作者： Ramanuj kumar ashok kumar Sahoo Purna Chandra mishra Rabin kumar Das School of Mechanical Engineering Kalinga Institute of Industrial Technology BhubaneswarOdisha 751024 India

The investigation of low cost uncoated andcoated carbide insert in the hard turning of hardened AISID2 steel （≥55 HRC） will definitely open up a new arena asan economical alternative suitable to industrial machiningsectors. Thus, this paper reports the comparative machin-ability assessment for the hard turning of AISI D2 steel（（55 ± 1） HRC） by coated and uncoated carbide insert in adry environment. Micro hardness and abrasion tests werecarried out to assess resistance capability against wear. Theabove test results confirmed the greater wear resistanceability of AIaO3 coated carbide insert over uncoated car-bide. Based on the extensive investigation of comparativemachinability, the coated carbide insert （TiN-TiCN-A12O3）outperformed the uncoated carbide insert with regard tosurface roughness, flank wear, chip-tool interface temper-ature, and chip morphology. Abrasion and diffusion wereobserved as the principal tool wear mechanisms in theinvestigated range. The uncoated carbide failed completelydue to the severe chipping and quick dulling of the cuttingedge, which led to its unsuitability for machining hardenedsteel.

关键词： Coated and uncoated carbide Hard turning Machinability Flank wear Surface roughness Chipmorphology Cutting temperature

Comparative study of green peas using with blanching & without blanching techniques

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Information Processing in Agriculture 2019年第2期6卷 285-296页

作者： Om Prakash Pandey Bimal kumar mishra ashok Misra Department of Mechanical Engineering Birla Institute of TechnologyMesraRanchiIndia Department of Mathematics Birla Institute of TechnologyMesraRanchiIndia

This paper attempts to analyze the kinetics involved in the drying of green peas in‘with blanching’and‘without blanching’*** by hot water mixed with a solution of citric acid(0.1–0.2 mg/ml)at 70C–100C is the treatment provided to the samples of green *** analysis shows that the moisture content in green peas of three different sizes is reduced at different temperatures and demonstrates the effect of the rate of drying of the moisture *** different diameters and temperatures,the parameters are analyzed using‘with blanching’and‘without blanching’*** is observed that‘with blanching’process plays a significant role in the reduction of moisture content under different temperatures and diameters in a lesser time as compared to‘without blanching’.The operative activation energy and moisture diffusivity are described by using Fick’s law of *** calculation of effective moisture diffusivity can be done via the utilization of *** drying data is subjected to two models of mathematical nature:Simple Exponential model,and Page *** performance of these models is examined by means of comparing the coefficient of determination(R2),chi-square(v2)and root mean square error(RMSE)between the experimental and forecasted value of moisture ratio obtained‘with blanching’and‘without blanching’.The experimental data was seen to be in accordance with the Page *** comparisons of energy consumption,energy efficiency and also the cost of the drying processes for‘with blanching’and‘without blanching’have been accomplished to optimize and reduce process condition and the cost of the process,respectively.

关键词： Hot air drying Green peas Drying kinetics Blanching Fluidized bed dryer

Investigation of structural, morphological and electrochemical properties of mesoporous La2CuCoO6 rods fabricated by facile hydrothermal route

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International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 987-995页

作者： Jashandeep Singh ashok kumar Department of Physics National Institute of Technology KurukhsetraHaryana 136119India Department of Applied Sciences National Institute of Technical Teachers Training and ResearchChandigarh 160019India

This work introduces the facile hydrothermal synthesis of double perovskite La2CuCoO6.X-ray diffraction pattern confirmed the formation of a monoclinic phase with P121/c1 *** electron microscopy results revealed that the self-assembled porous rods were composed of nanocrystallite *** estimated specific surface area of these mesoporous rods with an average pore diameter of 6 nm was^41 m^2·g^–*** presence of ions with oxidation states of La^3+,Cu^2+,and Co^2+/Co^3+on the surface of the mesoporous La2CuCoO6 rods was confirmed by X-ray photoelectron spectroscopic *** cyclicvoltammetry and chronopotentiometry,the electrode fabricated from the mesoporous La2CuCoO6 rods were found to exhibit pseudocapacitive behavior with a specific capacitance of 259.4 F·g^–1 at a current density of 0.5 A·g^–***^89%retention in specific capacitance was achieved after 1000 charge/discharge cycles at a constant current density of4 A·g^–1.

关键词： rare earth double perovskites oxide materials hydrothermal electrochemical

Image smog restoration using oblique gradient profile prior and energy minimization

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Frontiers of Computer Science 2021年第6期15卷 147-153页

作者： ashok kumar Arpit JAIN College of Computing Science and Information Technogy TeerthankerMahaveer UniversityMoradabad 244001India

Removing the smog from digital images is a challenging pre-processing tool in various imaging ***,many smog removal(i.e.,desmogging)models are proposed so far to remove the effect of smog from *** desmogging models are based upon a physical model,it means it requires efficient estimation of transmission map and atmospheric veil from a single smoggy ***,many prior based restoration models are proposed in the literature to estimate the transmission map and an atmospheric ***,these models utilized computationally extensive minimization of an energy ***,the existing restoration models suffer from various issues such as distortion of texture,edges,and ***,in this paper,a convolutional neural network(CNN)is used to estimate the physical attributes of smoggy *** gradient channel prior(OGCP)is utilized to restore the smoggy ***,a dataset of smoggy and sunny images are ***,we have trained CNN to estimate the smog gradient from smoggy ***,based upon the computed smog gradient,OGCP is utilized to restore the still smoggy *** analyses reveal that the proposed CNN-OGCP based desmogging model outperforms the existing desmogging models in terms of various performance metrics.

关键词： convolutional neural networks desmogging smog oblique gradient channel prior

Translocator protein and neurodegeneration: insights from Alzheimer’s disease

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Neural Regeneration Research 2025年第4期20卷 1090-1091页

作者： Arpit kumar Pradhan Rainer Rupprecht Gerhard Rammes Klinik für Anaesthesiologie und Intensivmedizin der Technischen Universität München Klinikum rechts der IsarMunichGermany Graduate School of Systemic Neurosciences Ludwig-Maximilians-Universität MünchenMartinsriedGermany Department of Psychiatry and Psychotherapy University RegensburgRegensburgGermany

The 18 kDa translocator protein(TSPO)located on the outer mitochondrial membrane regulates several key cellular processes including mitochondrial homeostasis,cholesterol transport,apoptosis,cell proliferation,and maintenance of mitochondrial health(Rupprecht et al.,2022,2023).TSPO is expressed in both peripheral organs and the central nervous system,with a more pronounced expression in tissues that produce *** main reason why TSPO has garnered so much attention is because it plays a key role in neurosteroidogenesis by transferring cholesterol from the outer to the inner mitochondrial membrane,which is the rate-limiting step in neurosteroid synthesis.A cholesterol-recognizing amino acid consensus domain has been identified in the cytosolic C terminus of the TSPO protein by both in vitro and site-directed mutagenesis experiments(Li et al.,2001).However,the role of TSPO in the process of neurosteroid synthesis has been challenged by several studies,particularly TSPO knockout models,which suggest that TSPO removal does not affect the phenotype or the system’s viability(Tu et al.,2014).However,ligands targeting TSPO have been shown to enhance levels of neurosteroids which suggests that neurosteroidogenesis is one of the major functional roles mediated by the TSPO protein.

关键词： cholesterol organs

Management of splenic artery aneurysm associated with extrahepatic portal vein obstruction

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Hepatobiliary & Pancreatic Diseases International 2012年第3期11卷 330-333页

作者： Pramod kumar mishra Sundeep Singh Saluja ashok K Sharma Premanand Pattnaik Department of Gastrointestinal Surgery Surgery GB Pant Hospital Department of Gastrointestinal Surgery and Department of Radiology Surgery GB Pant Hospital Department of Gastrointestinal Surgery GB Pant Hospital

BACKGROUND: Splenic artery aneurysms although rare are clinically significant in view of their propensity for spontaneous rupture and life-threatening bleeding. While portal hypertension is an important etiological factor, the majority of reported cases are secondary to cirrhosis of the liver. We report three cases of splenic artery aneurysms associated with extrahepatic portal vein obstruction and discuss their management. METHODS: The records of three patients of splenic artery aneurysm associated with extrahepatic portal vein obstruction managed from 2003 to 2010 were reviewed retrospectively. The clinical presentation, surgical treatment and outcome were analyzed. RESULTS: The aneurysm was >3 cm in all patients. The clinical symptoms were secondary to extrahepatic portal vein obstruction (hematemesis in two, portal biliopathy in two) while the aneurysm was asymptomatic. Doppler ultrasound demonstrated aneurysms in all patients. A proximal splenorenal shunt was performed in two patients with excision of the aneurysm in one patient and ligation of the aneurysm in another one. The third patient had the splenic vein replaced by collaterals and hence underwent splenectomy with aneurysmectomy. All patients had an uneventful post-operative course. CONCLUSIONS: Splenic artery aneurysms are associated with extrahepatic portal vein obstruction. Surgery is the mainstay of treatment. Although technically difficult, it can be safely performed in an experienced center with minimal morbidity and good outcome.

关键词： splenic artery aneurysm extrahepatic portal vein obstruction portal hypertension proximal splenorenal shunt