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A Shunt Active Filter for Reactive Power Compensation and Harmonic Mitigation
Narayan G. Apte,Vishram N. Bapat,Amruta N. Jog 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a digital simulation of a 3Φ Shunt Active Filter (SAF) for harmonic and reactive power compensation. The instantaneous harmonic and reactive compensating currents is desegregated in it’s three components viz., (a) fundamental reactive current (b) oscillating harmonic reactive current (c) oscillating harmonic active current. The resultant compensating current is injected to the point of common coupling (PCC) of the ac mains by a six pulse, hysteresis current controlled, Voltage Source Inverter (VSI). A high performance hysteresis band modulation technique is proposed to maintain nearly constant device switching frequency. The hysteresis bandwidth is modulated as a function of the desired switching frequency , supply voltage, DC bus voltage and slope of the reference current. Responses of simulated model clearly reveal the desired performance of SAF.
Writer Verification Using Spatial Domain Features under Different Ink Width Conditions
Kore, Sharada Laxman,Apte, Shaila Dinkar Korean Institute of Information Scientists and Eng 2016 Journal of Computing Science and Engineering Vol.10 No.2
In this paper, we present a comparative study of spatial domain features for writer identification and verification with different ink width conditions. The existing methods give high error rates, when comparing two handwritten images with different pen types. To the best of our knowledge, we are the first to design the feature with different ink width conditions. To address this problem, contour based features were extracted using a chain code method. To improve accuracy at higher levels, we considered histograms of chain code and variance in bins of histogram of chain code as features to discriminate handwriting samples. The system was trained and tested for 1,000 writers with two samples using different writing instruments. The feature performance is tested on our newly created dataset of 4,000 samples. The experimental results show that the histogram of chain code feature is good compared to other methods with false acceptance rate of 11.67%, false rejection rate of 36.70%, average error rates of 24.18%, and average verification accuracy of 75.89% on our new dataset. We also studied the effect of amount of text and dataset size on verification accuracy.
StellaTUM: current consensus and discussion on pancreatic stellate cell research
Erkan, Mert,Adler, Guido,Apte, Minoti V,Bachem, Max G,Buchholz, Malte,Detlefsen, Sö,nke,Esposito, Irene,Friess, Helmut,Gress, Thomas M,Habisch, Hans-Joerg,Hwang, Rosa F,Jaster, Robert,Kleeff, J&ou BMJ Group 2012 Gut: journal of the British Society of Gastroenter Vol.61 No.2
The Intricacies of Insomnia: A Comprehensive Exploration
Nimit Khara,Anagha Apte,Yagnang Vyas,Dhaval Prajapati,Ravish Kshatriya,Sateesh Patel 대한수면연구학회 2024 Journal of sleep medicine Vol.21 No.2
Insomnia is a pervasive and often debilitating sleep disorder that profoundly affects health and overall wellbeing. This comprehensive review focuses on the historical context, clinical significance, diagnostic criteria, investigative methods, and global treatment guidelines for insomnia. Historically, references to insomnia have appeared in ancient Egyptian and Greek texts, but it was not until the 19th century that they were rigorously studied and classified. Notable individuals, including Vincent van Gogh, Franz Kafka, and Marilyn Monroe, have struggled publicly with insomnia, underscoring its widespread nature. The pathophysiology of insomnia is multifactorial, involving physiological, psychological, and environmental factors. Hyperarousal, dysregulation of the sleep-wake cycle, and neurotransmitter imbalances are central to its development. Insomnia can be categorized into acute, chronic, comorbid, idiopathic, and behavioral types. Epidemiological studies have revealed that up to 30% of adults experience insomnia, with a higher prevalence among women, older adults, and those with a lower socioeconomic status. Insomnia is associated with adverse health outcomes, including cardiovascular diseases, metabolic disorders, cognitive impairment, and increased mortality risk. The COVID-19 pandemic has exacerbated insomnia owing to stress and lifestyle changes. Diagnosis involves a comprehensive assessment, including sleep history, physical examination, and objective evaluations, such as polysomnography. Treatment combines pharmacological and non-pharmacological interventions with cognitive behavioral therapy for insomnia as the first-line approach. Pharmacotherapy includes benzodiazepines, non-benzodiazepine hypnotics, antidepressants, melatonin, and orexin receptor antagonists. Guidelines from the American Academy of Sleep Medicine and the European Sleep Research Society emphasize individualized, evidence-based treatment plans to improve sleep quality and overall health. Insomnia is a pervasive and often debilitating sleep disorder that profoundly affects health and overall well-being. This comprehensive review focuses on the historical context, clinical significance, diagnostic criteria, investigative methods, and global treatment guidelines for insomnia. Historically, references to insomnia have appeared in ancient Egyptian and Greek texts, but it was not until the 19th century that they were rigorously studied and classified. Notable individuals, including Vincent van Gogh, Franz Kafka, and Marilyn Monroe, have struggled publicly with insomnia, underscoring its widespread nature. The pathophysiology of insomnia is multifactorial, involving physiological, psychological, and environmental factors. Hyperarousal, dysregulation of the sleep-wake cycle, and neurotransmitter imbalances are central to its development. Insomnia can be categorized into acute, chronic, comorbid, idiopathic, and behavioral types. Epidemiological studies have revealed that up to 30% of adults experience insomnia, with a higher prevalence among women, older adults, and those with a lower socioeconomic status. Insomnia is associated with adverse health outcomes, including cardiovascular diseases, metabolic disorders, cognitive impairment, and increased mortality risk. The COVID-19 pandemic has exacerbated insomnia owing to stress and lifestyle changes. Diagnosis involves a comprehensive assessment, including sleep history, physical examination, and objective evaluations, such as polysomnography. Treatment combines pharmacological and non-pharmacological interventions with cognitive behavioral therapy for insomnia as the first-line approach. Pharmacotherapy includes benzodiazepines, non-benzodiazepine hypnotics, antidepressants, melatonin, and orexin receptor antagonists. Guidelines from the American Academy of Sleep Medicine and the European Sleep Research Society emphasize individualized, evidence-based treatment plans to improve sleep quality and overall health.
Kale, Bharat B.,Baeg, Jin-Ook,Apte, Sanjay K.,Sonawane, Ravindra S.,Naik, Sonali D.,Patil, Kashinath R. Royal Society of Chemistry 2007 Journal of materials chemistry Vol.17 No.40
<P>The present work is the investigation of our novel approach to designing quantum dot–glass nanosystems by confining nano CdS in designated glass and the first employment of such a quantum dot system in solar hydrogen production. The CdS quantum dots were grown in a special glass matrix, which involved a sequence of steps. The obtained glass was of uniformly bright yellow in color and the bulk glass was pulverized to a fine powder of micron size particles. The glass powder was characterized structurally and morphologically. X-Ray diffraction and electron diffraction patterns reveal a hexagonal crystallite system for the CdS quantum dots. Field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray fluorescence spectroscopy and chemical leaching with HCl studies demonstrate that the 2.5 nm size CdS quantum dots distribute homogeneously in a monodispersed form in the glass domain and on the surface with a “partially embedded exposure” configuration. This disposition imparts an excellent photostability against photocorrosion and also a facile catalytic function. Therefore, even a very small amount of CdS quantum dots (0.005 g per gram of glass powder) is able to photodecompose H<SUB>2</SUB>S under visible light (<I>λ</I> ≥ 420 nm) both in alkaline and pure aqueous media and produce solar hydrogen with markedly high quantum yields of 17.5 and 11.4%, respectively at 470 nm. Salient features like reusability after simple washing, corrosionless-stability and remarkable catalytic activity of this quantum dot–glass nanosystem are brought forth by our novel catalyst design and are much acclaimed in large scale solar H<SUB>2</SUB> production.</P> <P>Graphic Abstract</P><P>CdS quantum dots (∼2.5 nm) in a “partially embedded exposure” configuration were grown in a special glass matrix. This nanosystem was employed for the first time for the photocatalytic production of H<SUB>2</SUB> under visible light. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b708269j'> </P>
Patil, S.S.,Patil, D.R.,Apte, S.K.,Kulkarni, M.V.,Ambekar, J.D.,Park, C.J.,Gosavi, S.W.,Kolekar, S.S.,Kale, B.B. Elsevier 2016 Applied Catalysis B Vol.190 No.-
<P>Ag3PO4 is a good photocatalyst but ubiquitously known for its photocorrosion problem during photocatalytic reaction. Therefore, stabilization of Ag3PO4 with retaining its fundamental properties has immense importance. With this motivation, we designed Ag3PO4 glass nanocomposite to resolve the problem of photocorrosion. Moreover, the effect of size quantization on photocatalytic activity has also been demonstrated by growing the cubic Ag3PO4 nanoparticles with size in the range of 3-9 nm in glass matrix via melt and quenching method. The band gap of Ag3PO4 has been tuned (2.56-2.25 eV) in glass matrix with respect to size. Considering the size tunable band gap of Ag3PO4 glass nanocomposite within visible region, it is demonstrated as a photocatalyst for hydrogen (H-2) production from copious hazardous waste H2S. The utmost H-2 production i.e. 3920.4 mu mol h(-1) g(-1) is obtained using 1 gm of Ag3PO4 glass nanocomposite powder. The apparent quantum yield for H-2 production is calculated to be 5.51% for Ag3PO4 glass nanocomposite. Interestingly, presence of plasmonic Ag was also observed in Ag3PO4 glass nanocomposite which contributes for H-2 production through enhanced light absorption, efficient charge separation and improved stability. Recycling study of sample reveals stable H-2 production efficiency and good stability of the photocatalyst. Surprisingly, catalyst can be reused many times and recovery of catalyst is possible just rinsing with distilled water. All these results demonstrate directly the feasibility of designing a new generation photocatalysts. (C) 2016 Published by Elsevier B.V.</P>