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Why is graphene an extraordinary material? A review based on a decade of research

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Frontiers of Materials Science 2022年第2期16卷 1-39页

作者： Sachin sharma ashok KUMAR Shahid BASHIR Kasi RAMESH Subramaniam RAMESH Centre for Ionics University of Malaya Department of PhysicsFaculty of ScienceUniversiti MalayaKuala Lumpur 50603Malaysia Higher Institution Centre of Excellence(HICoE) UM Power Energy Dedicated Advanced Centre(UMPEDAC)Level 4Wisma R&DUniversiti MalayaJalan Pantai BaharuKuala Lumpur 59990Malaysia

During this decade,graphene which is a thin layer of carbon material along at ease with synthesis and functionalization has become a hot topic of research owing to excellent mechanical strength,very good current density,high thermal conductivity,superior electrical conductivity,large surface area,and good electron *** research on graphene has exponentially accelerated specially when Geim and Novoselov developed and analyzed *** this basis,for industrial application,researchers are exploring different techniques to produce high-quality ***,reviewed in this article is a brief introduction to graphene and its derivatives along with some of the methods developed to synthesize graphene and its prospective applications in both research and *** this work,recent advances on applications of graphene in various fields such as sensors,energy storage,energy harvesting,high-speed optoelectronics,supercapacitors,touch-based flexible screens,and organic light emitting diode displays have been summarized.

关键词： graphene graphene oxide electrochemical sensor fuel cell supercapacitor dye-sensitized fuel cell lithium battery energy storage

NiCo2O4 decorated PANI–CNTs composites as supercapacitive electrode materials

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Journal of Energy Chemistry 2017年第1期26卷 175-181页

作者： Gunjana Chaudhary ashok K.sharma Preetam Bhardwaj Kamal Kant Indu Kaushal Ajay K.Mishra Thin Film Laboratory Department of Materials Science and NanotechnologyDeenbandhu Chhotu Ram University of Science and TechnologyMurthal 131039India Nanotechnology and Water Sustainability Research Unit College of ScienceUniversity of South AfricaUnisa Science CampusJohannesburgSouth Africa

Hierarchical Ni CoO/PANI/CNTs hybrid composites were designed and fabricated having a layer of Ni CoOon the surface of PANI encapsulated CNTs with different morphologies. Physicochemical attributes of the synthesized composites were examined by FTIR, UV–visible and X-ray diffraction（XRD）techniques. Morphological aspects were evaluated by field-emission scanning microscopy（FESEM）,electron diffraction spectroscopy（EDS）, high resolution transmission electron microscopy（HRTEM） and selected area electron diffraction（SAED） studies. Electrochemical measurements revealed an improved specific capacitance of 2250 F/g at a scan rate of 5 m V/s and 2000 F/g at a current density of 1 A/g with good rate capability using a three-electrode system. These enhanced features are achieved from the well designed nanostructure and the synergistic contributions of individual components in the electrode material.

关键词： Polyaniline Carbon nanotubes Nickel cobaltite Supercapacitor

Enhanced Marathi Speech Recognition Facilitated by Grasshopper Optimisation-Based Recurrent Neural Network

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Computer Systems Science & Engineering 2022年第11期43卷 439-454页

作者： Ravindra Parshuram Bachate ashok sharma Amar Singh Ayman AAly Abdulaziz HAlghtani Dac-Nhuong Le School of Computer Science and Engineering Lovely Professional UniversityPunjab144001India Department of Computer Science and IT University of JammuJammu and Kashmir180006India School of Computer Applications Lovely Professional UniversityPunjab144001India Department of Mechanical Engineering College of EngineeringTaif UniversityTaif21944Saudi Arabia School of Computer Science Duy Tan UniversityDanang550000Vietnam Institute of Research and Development Duy Tan UniversityDanang550000Vietnam

Communication is a significant part of being human and living in the *** kinds of languages and their variations are there;thus,one person can speak any language and cannot effectively communicate with one who speaks that language in a different *** application fields such as education,mobility,smart systems,security,and health care systems utilize the speech or voice recognition models ***,various studies are focused on the Arabic or Asian and English languages by ignoring other significant languages like Marathi that leads to the broader research motivations in regional *** is necessary to understand the speech recognition field,in which the major concentrated stages are feature extraction and *** paper emphasis developing a Speech Recognition model for the Marathi language by optimizing Recurrent Neural Network(RNN).Here,the preprocessing of the input signal is performed by smoothing and median *** preprocessing the feature extraction is carried out using MFCC and Spectral features to get precise features from the input Marathi Speech *** optimized RNN classifier is used for speech recognition after completing the feature extraction task,where the optimization of hidden neurons in RNN is performed by the Grasshopper Optimization Algorithm(GOA).Finally,the comparison with the conventional techniques has shown that the proposed model outperforms most competing models on a benchmark dataset.

关键词： Deep learning grasshopper optimization algorithm recurrent neural network speech recognition word error rate

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

Paediatric cornea crosslinking current strategies:A review

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Advances in Ophthalmology Practice and Research 2023年第2期3卷 55-62页

作者： Pawan Prasher ashok sharma Rajan sharma Vipan K.Vig Verinder S.Nirankari Department of Ophthalmology Sri Guru Ram Das Institute of Medical Sciences and ResearchAmritsarPunjabIndia Cornea Centre SCO 2463-2464Sector 22 C160022ChandigarhIndia Amritsar Eye Hospital GNDU Shopping ComplexAmritsarPunjabIndia Department of Ophthalmology University of MarylandUSA

Background:In the general population,1 in 2000 people has *** and other people from Southeast Asia have a higher incidence of *** with keratoconus typically present earlier in life and with a more severe *** the eyes has been identified as a risk *** have a higher incidence and a faster rate of keratoconus *** rehabilitation in children with keratoconus is *** have a low compliance with contact lens *** of these children require penetrating keratoplasty at an early ***,stopping the progression of keratoconus in children is of paramount *** text:Compared to treatment,keratoconus progression prophylaxis is not only preferable,but also *** collagen cross-linking has been shown to be safe and effective in stopping its progression in *** Dresden protocol,which involves central corneal deepithelization(7-9 mm),saturation of the stroma with riboflavin(0.25%),and 30 min UV-A exposure,has proven to be the most *** significant disadvantages of the typical Dresden regimen are the prolonged operating time and the significant post-operative ***-CXL(9 mW/cm^(2) x 10 min)has been studied to reduce operative time and has been shown to be equally effective in some *** to accelerated CXL or traditional CXL,epi-off procedures,transepithelial treatment without the need for de-epithelialization and without postoperative discomfort,have been shown to be safer but less *** crosslinking should only be performed after treating children with active vernal *** opacity,chronic corneal edema,sterile infiltrates,and microbial keratitis have been reported after cross-linking of corneal ***:The"Dresden protocol",also known as the conventional corneal cross-linking approach,should be used to halt the progression of keratoconus in young ***,if the procedure needs to

关键词： Keratoconus Corneal collagen cross-linking Corneal transplant Pediatric keratoconus

Why Formal Methods Are Considered for Safety Critical Systems?

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Journal of Software Engineering and Applications 2015年第10期8卷 531-538页

作者： Monika Singh ashok Kumar sharma Ruhi Saxena Faculty of Engineering & Technology (FET) Mody University of Science & Technology Sikar India Computer Science & Engineering Thapar University Patiala India

Formal methods are the mathematically techniques and tools which are used at early stages of software development lifecycle processes. The utter need of using formal methods in safety critical system leads to accuracy, consistency and correctness in proposed system. In safety critical real time application, requirements should be unambiguous and very accurate which can be achieved by using mathematical theorems. There is utter need to focus on the requirement phase which is the most critical phase of SDLC. This paper focuses on the use of Z notation for incorporating the accuracy, consistency, and eliminates ambiguity in safety critical system: Road Traffic Management System as a case study. The syntax, semantics, type checking and domain checking are further verified by using Z/EVES: a Z notation type checker tool.

关键词： Formal Methods Safety Critical System Z Notation Z/EVES Syntax & Type Checking Domain Checking

Assay method for quality control and stability studies of a new antimalarial agent (CDRI 99/411)

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Journal of Pharmaceutical Analysis 2013年第5期3卷 335-340页

作者： Kiran Khandelwal Shakti Deep Pachauri Sofa Zaidi Pankaj Dwivedi ashok Kumar sharma Chandan Singh Anil Kumar Dwivedi Division of Pharmaceutics CSIR-Central Drug Research Institute Division of Medicinal and Process Chemistry CSIR-Central Drug Research Institute

CDRI compound no. 99/411 is a potent 1,2,4-trioxane antimalarial candidate drug under development at our Institute. An HPLC method for determination of CDRI 99/411 with its starting material and intermediates has been developed and validated for in process quality control and stability studies. The analytical performance parameters such as linearity, precision, accuracy, specificity, limit of detection （LOD） and lower limit of quantification （LLOQ） were determined according to International Conference on Harmonization ICH Q2（R1） guidelines. HPLC separation was achieved on a RP-select B Lichrosphere~ column （250 mm x 4 ram, 5 lam, Merck） using water containing 0.1% glacial acetic acid and acetonitrile as the mobile phase in a gradient elution. The eluents were monitored by a photo diode array detector at 245 and 275 nm. Based on signal to noise ratio of 3 and 10 the LOD of CDRI 99/411 was 0.55 μg/mL, while the LLOQ was 1.05 μg/mL. The calibration curves were linear in the range of 1.05- 68 μg/mL. Precision of the method was determined by inter- and intra-assay variations within the acceptable range.

关键词： HPLC Trioxane Process quality control Stability

Cardioprotective activity of alcoholic extract of Tinospora cordifolia (Willd.) Miers in calcium chloride-induced cardiac arrhythmia in rats

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The Journal of Biomedical Research 2011年第4期25卷 280-286页

作者： Ashish Kumar sharma Kunal Kishore Divya sharma B.P Srinivasan Shyam Sunder Agarwal ashok sharma Santosh Kumar Singh Samir Gaur Vijay Singh Jatav Department of Pharmacology Gyan Vihar School of PharmacySuresh Gyan Vihar UniversityJagatpuraJaipur (Rajasthan)302025India Delhi Institute of Pharmaceutical Sciences & Research Department of PharmacologyPushpviharSector Ⅲ.New Delhi 110017India

The present study investigated the antiarrhythmic activity of alcoholic extract of Tinospora cordifolia （T. cordifolia） in CaCl2 induced arrhythmia. CaCl2 （25 mg/kg） was administered by intravenous infusion （iv） to produce arrhythmia in rats. The animals were then treated with T. cordifolia extract （150, 250, and 450 mg/kg） and verapamil （5 mg/kg,iv）. Lead II electrocardiogram was monitored. Plasma calcium, sodium and potassium levels were measured. In CaCl2 induced arrhythmia, heart rate was decreased by 41.10%, T. cordifolia at 150, 300, and 450 mg/kg decreased the heart rate by 26.30%, 29.16%, and 38.29%, respectively, and verapamil reduced the heart rate by 9.70% compared to the normal group. The PQRST waves were normalized and atrial and ventricular fibrillation was controlled in rats treated with verapamil and T. cordifolia. CaCl2 increased calcium and sodium levels and decreased potassium levels in blood. T. cordifolia dose-dependently decreased calcium and sodium levels and increased potassium levels. Hence, T. cordifolia can be used in antiarrhythmic clinical settings and beneficial in atrial and ventricular fibrillation and flutter and may be indicated in ventricular tachyarrhythmia.

关键词： Tinospora cordifolia arrhythmia cardioprotection.

Involvement of adenosine and standardization of aqueous extract of garlic(Allium sativum Linn.)on cardioprotective and cardiodepressant properties in ischemic preconditioning and myocardial ischemia-reperfusion induced cardiac injury

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The Journal of Biomedical Research 2012年第1期26卷 24-36页

作者： Ashish Kumar sharma Arshee Munajjam Bhawna Vaishnav Richa sharma ashok sharma Kunal Kishore Akash sharma Divya sharma Rita Kumari Ashish Tiwari Santosh Kumar Singh Samir Gaur Vijay Singh Jatav Barthu Parthi Srinivasan Shyam Sunder Agarwal Department of Pharmacology Gyan Vihar School of PharmacySuresh Gyan Vihar University Department of Pharmacology Delhi Institute of Pharmaceutical Sciences & Research

The present study investigated the effect of garlic （Allium sativum Linn.） aqueous extracts on ischemic pre- conditioning and ischemia-reperfusion induced cardiac injury, as well as adenosine involvement in ischemic pre- conditioning and garlic extract induced cardioprotection. A model of ischemia-reperfusion injury was established using Langendorff apparatus. Aqueous extract of garlic dose was standardized （0.5%, 0.4%, 0.3%, 0.2%, 0.1%, 0.07%, 0.05%, 0.03%, 0,01%）, and the 0.05% dose was found to be the most effective. Higher doses （more than 0.05%） were highly toxic, causing arrhythmia and cardiodepression, whereas the lower doses were ineffective. Garlic exaggerated the cardioprotective effect of ischemic preconditioning. The cardioprotective effect of ischemic preconditioning and garlic cardioprotection was significantly attenuated by theophylline （1,000 ~tmol/L） and 8-SPT （10 mg/kg, i.p.） and expressed by increased myocardial infarct size, increased LDH level, and reduced nitrite and adenosine levels. These findings suggest that adenosine is involved in the pharmacological and molecular mechanism of garlic induced cardioprotection and mediated by the modulation of nitric oxide.

关键词： Allium sativum Linn. ischemic preconditioning cardioprotection adenosine nitrite