http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Performance of Protection Systems during Catastrophic failures in Power Systems
Phadke Arun G. The Korean Institute of Electrical Engineers 2005 KIEE International Transactions on Power Engineeri Vol.a5 No.2
Catastrophic failures in power systems are rare but not uncommon events. Protection systems play an important role in the progression of events during a catastrophic failure. This paper will examine some of the historical records, and suggest possible improvements to protection systems which can have a positive impact on power system performance during catastrophic failures.
Patil K.,Phadke S.,Das M.,Mishra A. 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.4
In the present study, the impact of Cr ion substitution on Mn–Zn soft nanoferrites has enhanced the dielectric, electrical conductivity, and impedance properties. The nanoferrites have been synthesized via a non-conventional wet chemical-based co-precipitation technique. Raman scattering confi rms the spinel nature and also reveals a positive frequency shift with the Cr ion substitution. As Cr ion concentration increases, the dielectric constant ( ε ′) increases signifi cantly at room temperature. At 100 Hz, x = 0.5 [Mn 0.5 Cr 0.5 Fe 2 O 4 ] resulted in higher value of ε ′ ~ 10 4 and a lower value of loss (tan δ ) ~ 3.9. Frequency modulated ac conductivity rises with increasing Cr substitution in Mn–Zn nanoferrites. Electric modulus, impedance spectra, and conduction nature were found to improve with increasing Cr ions. The Nyquist plot shows two semicircle responses in the high and mid-frequency regions, which is due to a conduction mechanism of charges (Fe 2+ Fe 3+ ) that is related to bulk grains and grain boundary contribution, respectively. High dielectric constants and minimum electric loss in soft nanoferrite materials are useful for electronic device applications.
R. Shashikant,Uttam Chaskar,Leena Phadke,Chetankumar Patil 대한의용생체공학회 2021 Biomedical Engineering Letters (BMEL) Vol.11 No.3
The main objective of the study was to develop a low-cost, non-invasive diagnostic model for the early prediction of T2DMrisk and validation of this model on patients. The model was designed based on the machine learning classifi cation techniqueusing non-linear Heart rate variability (HRV) features. The electrocardiogram of the healthy subjects (n = 35) and T2DMsubjects (n = 100) were recorded in the supine position for 15 min, and HRV features were extracted. The signifi cant nonlinearHRV features were identifi ed through statistical analysis. It was found that Poincare plot features (SD1 and SD2) candiff erentiate the T2DM subject data from healthy subject data. Several machine learning classifi ers, such as Linear DiscriminantAnalysis (LDA), Quadratic Discriminant Analysis, Naïve Bayes, and Gaussian Process Classifi er (GPC), have classifi edthe data based on the cross-validation approach. A GP classifi er was implemented using three kernels, namely radial basis,linear, and polynomial kernel, considering the ability to handle the non-linear data. The classifi er performance was evaluatedand compared using performance metrics such as accuracy(AC), sensitivity(SN), specifi city(SP), precision(PR), F1 score,and area under the receiver operating characteristic curve(AUC). Initially, all non-linear HRV features were selected forclassifi cation, but the specifi city of the model was the limitation. Thus, only two Poincare plot features were used to designthe diagnostic model. Our diagnostic model shows the performance using GPC based linear kernel as AC of 92.59%, SNof 96.07%, SP of 81.81%, PR of 94.23%, F1 score of 0.95, and AUC of 0.89, which are more extensive compared to otherclassifi cation models. Further, the diagnostic model was deployed on the hardware module. Its performance on unknown/testdata was validated on 65 subjects (healthy n = 15 and T2DM n = 50). Considering the desirable performance of the diagnosticmodel, it can be used as an initial screening test tool for a healthcare practitioner to predict T2DM risk.
Non-blinking dendritic crystals from C-dot solution
Ashmi Mewada,Ritesh Vishwakarma,Bhushan Patil,Chinmay Phadke,Golap Kalita,Maheshwar Sharon,Madhuri Sharon 한국탄소학회 2015 Carbon Letters Vol.16 No.3
Bio-imaging and drug carriers for delivery have created a huge demand for crystals. Crystals are fascinating materials that have been grown for a long time but obtaining biocompatible fluorescent crystals is a challenging task. We report on the growth of fluorescent crystals using a carbon dot (C-dot) solution by a hydrothermal process. The crystallization pattern of these C-dots exhibited a unique dendritic structure having a feather-like morphology. The growth temperature and pressure were maintained at 60°C and 200 mmHg, respectively, for crystal growth. A green fluorescence (under UV light) that was observed in the C-dot solution was retained in the crystals formed from the solution. Cytotoxicity studies on Vero cells revealed the crystals to be extremely biocompatible. These fluorescent crystals are extremely well suited for biomedical and optoelectronic applications.
Lakshmi Narasimha Murthy,Girija Gajanan Phadke,Vijayakumar Siddaiah,Rajanna Karani Boraiah 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.5
In the present study, the dynamic viscoelastic behavior (DVB) and flow behavior of fresh tilapia (Oreochromis mossambicus) meat containing cryoprotectants were evaluated with and without water washing. The DVB profile of washed meat with 4% sucrose and sorbitol indicated the maximum structure buildup reaction up to 56.8 C; thereafter, hydrophobic interactions leading to decreased gelation were suppressed. In both the samples, there was no clear indication of the sol–gel transition temperature. In flow-profile measurements, the presence of cryoprotectants gave rise to the minimum thixotropic area, indicating a low level of impairment in structure. The shear-stress sweep of water-washed tilapia proteins added with cryoprotectants did not reveal significant changes at 28 and 40 C. In texture-profile analysis, the hardness values were lower in fresh meat than cooked meat. The findings of this study will be helpful in the formulation and design of various mince-based products and in determining the appropriate use of cryoprotectants and water washing in the processing of minced meat.
Shih, Yu-Ru V.,Hwang, YongSung,Phadke, Ameya,Kang, Heemin,Hwang, Nathaniel S.,Caro, Eduardo J.,Nguyen, Steven,Siu, Michael,Theodorakis, Emmanuel A.,Gianneschi, Nathan C.,Vecchio, Kenneth S.,Chien, Shu National Academy of Sciences 2014 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.111 No.3
<P>Synthetic matrices emulating the physicochemical properties of tissue-specific ECMs are being developed at a rapid pace to regulate stem cell fate. Biomaterials containing calcium phosphate (CaP) moieties have been shown to support osteogenic differentiation of stem and progenitor cells and bone tissue formation. By using a mineralized synthetic matrix mimicking a CaP-rich bone microenvironment, we examine a molecular mechanism through which CaP minerals induce osteogenesis of human mesenchymal stem cells with an emphasis on phosphate metabolism. Our studies show that extracellular phosphate uptake through solute carrier family 20 (phosphate transporter), member 1 (SLC20a1) supports osteogenic differentiation of human mesenchymal stem cells via adenosine, an ATP metabolite, which acts as an autocrine/paracrine signaling molecule through A2b adenosine receptor. Perturbation of SLC20a1 abrogates osteogenic differentiation by decreasing intramitochondrial phosphate and ATP synthesis. Collectively, this study offers the demonstration of a previously unknown mechanism for the beneficial role of CaP biomaterials in bone repair and the role of phosphate ions in bone physiology and regeneration. These findings also begin to shed light on the role of ATP metabolism in bone homeostasis, which may be exploited to treat bone metabolic diseases.</P>
( Vikas Pandey ),( Meghraj Ingle ),( Nilesh Pandav ),( Pathik Parikh ),( Jignesh Patel ),( Aniruddha Phadke ),( Prabha Sawant ) 대한장연구학회 2016 Intestinal Research Vol.14 No.1
To investigate the various etiologies, yields, and effects of capsule endoscopy (CE) on management and complications, along with follow up of patients with obscure gastrointestinal (GI) bleeding. Methods: The study group of patients included those having obscure, overt, or occult GI bleeding. The findings were categorized as (A) obvious/definitive, (B) equivocal, or (C) negative. Any significant alteration in patient management post CE in the form of drug or surgical intervention was noted. Results: Total patients included in the study were 68 (48 males and 20 females). The ratio of male:female was 2.4:1. The age ranged between 16 years to 77 years. Mean age for males was 62±14 years, for females 58±16 years. The total yield of CE with definitive lesions was in 44/68 (65.0%) of patients. In descending order (A) angiodysplasia 16/68 (23.53%), (B) Crohn’s disease 10/68 (14.70%), (C) non-steroidal anti-inflammatory drug enteropathy 8/68 (11.76%), (D) small bowel ulcers 4/68 (5.88%), (E) jejunal and ileal polyps 2/68 (2.94%), (F) intestinal lymphangiectasis 2/68 (2.94%), and (G) ileal hemangiomas 2/68 (2.94%) were followed. Equivocal findings 12/68 (17.65%) and negative study 12/68 (17.65%) was found. Complications in the form of capsule retention in the distal ileum were noted in 2/68 (2.94%) subjects. Statistically, there was a higher probability of finding the etiology if the CE was done during an episode of bleeding. Conclusions: CE plays an important role in diagnosing etiologies of obscure GI bleeding. Its role in influencing the management outcome is vital. (Intest Res 2016;14:69-74)
Difficult colonoscopy: air, carbon dioxide, or water insufflation?
( Alisha Chaubal ),( Vikas Pandey ),( Ruchir Patel ),( Prateik Poddar ),( Aniruddha Phadke ),( Meghraj Ingle ),( Prabha Sawant ) 대한장연구학회 2018 Intestinal Research Vol.16 No.2
Background/Aims: This study aimed to compare tolerance to air, carbon dioxide, or water insufflation in patients with anticipated difficult colonoscopy (young, thin, obese individuals, and patients with prior abdominal surgery or irradiation). Methods: Patients with body mass index (BMI) less than 18 kg/㎡ or more than 30 kg/㎡, or who had undergone previous abdominal or pelvic surgeries were randomized to air, carbon dioxide, or water insufflation during colonoscopy. The primary endpoint was cecal intubation with mild pain (less than 5 on visual analogue scale [VAS]), without use of sedation. Results: The primary end point was achieved in 32.7%, 43.8%, and 84.9% of cases with air, carbon dioxide and water insufflation (P<0.001). The mean pain scores were 5.17, 4.72, and 3.93 on the VAS for air, carbon dioxide, and water insufflation (P<0.001). The cecal intubation rate or procedure time did not differ significantly between the 3 groups. Conclusions: Water insufflation was superior to air or carbon dioxide for pain tolerance. This was seen in the subgroups with BMI < 18 kg/m2 and the post-surgical group, but not in the group with BMI >30 kg/㎡. (Intest Res 2018;16:299-305)