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A combination of learning and non-learning based method for enhancement, compression and reconstruction of underwater images

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Aquaculture and Fisheries 2022年第2期7卷 201-210页

作者： Rashmi s.nair sandanam Domnic Department of Computer Applications National Institute of TechnologyTiruchirappalliTamil Nadu620015India

Complex nature of underwater environment poses biggest challenge towards image acquisition and transmission of underwater *** paper proposes an integrated approach which consists of a non-learning enhancement method with deep Convolutional Neural Networks(CNN)for compression and reconstruction of the *** proposed method does color and contrast correction for image *** enhanced images are down-sampled using 9-layer CNN followed by Discrete Wavelet Transform(DWT).The decompression is done by using Inverse ***,the sub-pixel up-sampled image is de-blurred using a three-layer *** Dense CNN(RD-CNN)is used to improve the quality of the reconstructed image after *** quality of the reconstructed images is measured using Peak signal to Noise Ratio(PsNR)and structural similarity Index Metric(ssIM).The proposed model provides better image enhancement,compression,and reconstruction quality than the existing state-of-the-art methods and super Resolution CNN(sRCNN)respectively.

关键词： Convolutional neural network Discrete wavelet transform Residual dense convolutional neural network Peak signal to noise ratio structural similarity index metric super resolution CNN

structural,magnetic and antibacterial properties of manganese-substituted magnetite ferrofluids

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International Journal of Minerals,Metallurgy and Materials 2023年第7期30卷 1417-1426页

作者： Blessy Babukutty Deepalekshmi Ponnamma swapna s.nair Jiya Jose saritha G.Bhat sabu Thomas Department of Physics Central University of KeralaKasargod 671314India Materials science and Technology Program College of Arts and SciencesQatar UniversityP.O.Box 2713DohaQatar Department of Biotechnology Cochin University of Science and TechnologyKalamasseryKeralaIndia Department of Chemistry Mahatma Gandhi UniversityKottayam 686560KeralaIndia

Manganese-substituted magnetite ferrofluids(FFs)Mnx Fe_(1-x)Fe_(2)O_(4)(x=0–0.8)were prepared in this work through a chemical coprecipitation *** controlled growth of FF nanomaterials for antibacterial activities is challenging,and therefore,very few reports are available on the *** research focuses on stabilizing aqueous FFs with the tetramethylammonium hydroxide surfactant to achieve high *** characterization reveals nanoparticles of 5–11 nm formed by the chemical reaction and nanocrystalline nature,as evident from structural ***-substituted magnetic FFs are analyzed for their structural,functional,and antibacterial performance according to the Mn-substituent *** studies show a high blue shift for Mn^(2+)-substituted Mnx Fe_(1-x)Fe_(2)O_(4)with the theoretical correlation of optical band gaps with the Mn *** superparamagnetic nature of substituted FFs causes zero coercivity and remanence,which consequently influence the particle size,cation distribution,and spin *** structural and functional performance of the FFs is correlated with the antibacterial activity,finally demonstrating the highest inhibition zone formation for Mnx Fe_(1-x)Fe_(2)O_(4)FFs.

关键词： manganese ferrofluids homogeneity antibacterial stability

Enhancing the surface Properties of a Bioengineered Anterior Cruciate Ligament Matrix for Use with Point-of-Care stem Cell Therapy

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Engineering 2021年第2期7卷 153-161页

作者： Xiaohua Yu Paulos Y.Mengsteab Ganesh Narayanan Lakshmi s.nair Cato T.Laurencin Connecticut Convergence Institute for Translation in Regenerative Engineering University of Connecticut HealthFarmingtonCT 06030USA Raymond and Beverly sackler Center for Biological Physical and Engineering SciencesUniversity of Connecticut HealthFarmingtonCT 06030USA Department of Orthopedic surgery University of Connecticut HealthFarmingtonCT 06030USA Department of Biomedical Engineering University of ConnecticutStorrsCT 06269USA Department of Materials science and Engineering University of ConnecticutStorrsCT 06269USA Department of Chemical and Biomolecular Engineering University of ConnecticutStorrsCT 06269USA Department of Reconstructive sciences University of Connecticut HealthFarmingtonCT 06030USA

We have previously developed a poly(L-lactic)acid(PLLA)bioengineered anterior cruciate ligament(ACL)matrix that has demonstrated enhanced healing when seeded with primary ACL cells prior to implantation in a rabbit model,as compared with the matrix *** suggests that improving cell adhesion on the matrix may beneficially affect the healing response and long-term performance of the bioengineered ACL *** regenerative engineering approach involves enhancing the surface properties of the matrix to support cell adhesion and growth in combination with point-of-care stem cell ***,we studied the cell adhesion properties of PLLA braided microfiber matrices enhanced through the physical adsorption of fibronectin and air plasma *** evaluated the kinetics and binding efficiency of fibronectin onto matrices at three time points and three fibronectin *** the matrix for 120 min in a solution of 25 lgmL1 fibronectin achieved the greatest binding efficiency to the matrix and cellular *** the matrices to air plasma treatment for 5 min before fibronectin adsorption significantly enhanced the cell adhesion of rabbit bone marrow-derived mesenchymal stem cells(R-BMMsCs)24 h post cell ***,cellular proliferation was monitored for up to 21 d,the matrices were exposed to air plasma treatment,and fibronectin adsorption was found to result in enhanced cell *** findings suggest that exposure to air plasma treatment and fibronectin adsorption enhances the cellular adhesion of PLLA braided microfiber matrices and may improve the clinical efficacy of the matrix in combination with point-of-care stem cell therapies.

关键词： Anterior cruciate ligament Ligament Poly(L-lactic)acid plasma treatment Fibronectin stem cells Adhesion

Electroconductivity,a regenerative engineering approach to reverse rotator cuff muscle degeneration

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Regenerative Biomaterials 2023年第1期10卷 1693-1712页

作者： Nikoo saveh-shemshaki Mohammed A.Barajaa Takayoshi Otsuka Elnaz s.Mirdamadi Lakshmi s.nair Cato T.Laurencin The Cato T.Laurencin Institute for Regenerative Engineering University of ConnecticutFarmingtonCT 06030USA Department of Biomedical Engineering University of ConnecticutStorrsCT 06269USA Department of Biomedical Engineering Imam Abdulrahman Bin Faisal UniversityDammam 31451Saudi Arabia Department of Orthopedic surgery University of Connecticut Health CenterFarmingtonCT 06030USA Department of Materials science and Engineering University of ConnecticutStorrsCT 06269USA Department of Chemical&Biomolecular Engineering University of ConnecticutStorrsCT 06269USA

Inhalation-administrated drugs remain an interesting possibility of addressing pulmonary *** drug delivery to the lungs allows one to obtain high concentration in the site of action with limited systemic distribution,leading to a more effective therapy with reduced required doses and side *** the other hand,there are several difficulties in obtaining a formulation that would meet all the criteria related to physicochemical,aerodynamic and biological properties,which is the reason why only very few of the investigated systems can reach the clinical trial phase and proceed to everyday use as a ***,we focused on powders consisting of polysaccharides,lipids,proteins or natural and synthetic polymers in the form of microparticles that are delivered by inhalation to the lungs as drug *** summarized the most common trends in research today to provide the best dry powders in the right fraction for inhalation that would be able to release the drug before being removed by natural *** review article addresses the most common manufacturing methods with novel modifications,pros and cons of different materials,drug loading capacities with release profiles,and biological properties such as cytocompatibility,bactericidal or anticancer properties.

关键词： pulmonary therapies drug delivery systems to lungs microparticles inhalers dry powder inhalers

Construction of Vertical Wind Profile from satellite-Derived Winds for Objective Analysis of Wind Field

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Advances in Atmospheric sciences 1992年第2期9卷 237-246页

作者： P.N.Mahajan D.R.Talwalkar s.nair s.Rajamani Indian Institute of Tropical Meteorology Pune-411008Indian Institute of Tropical Meteorology Pune-411008Indian Institute of Tropical Meteorology Pune-411008Indian Institute of Tropical Meteorology Pune-411008

During summer Monex-79, a variety of observing systems viz. research ships, research aircrafts, constant pressure balloons and geostationary satellite etc. were deployed, besides the regular conventional observations. The purpose of these additional systems was to make the best possible data for the studies on various aspects of monsoon circulation. The present study is aimed at the construction of vertical wind profile using cloud motion vectors obtained from GOEs (I-O) satellite and to examine whether the constructed wind profiles improves the representation of the monsoon system, flow pattern etc. in the objective analysis. For this purpose, climatological normals of the wind field are considered as the initial guess and the objective analyses of the wind field are made with, first using only data from conventional observations over land areas, subsequently including the constructed winds from cloud motion vectors. These analyses are then compared with the standard analyses of wind field obtained from Quick Look Atlas by T. N. Krishnamurti et al. (1979).It is inferred that satellite estimated mean wind profiles show good agreement with the mean wind profiles of the research ships with RMs errors less than 5 mps below 500 hPa and less than 8 mps above 500 hPa. It is further inferred that the inclusion of constructed winds shows a positive impact on the objective analysis and improvement is seen to be more marked in the data-sparse region of the Arabian sea. Analyses which include the constructed winds show better agreement with the standard analysis, than the analyses obtained using only conventional winds. Thus, results of our study suggest that the wind profiles constructed using cloud motion vectors are of potential use in objective analysis to depict the major circulation features over the Indian region.

关键词： Construction of Vertical Wind Profile from satellite-Derived Winds for Objective Analysis of Wind Field Wind

structural,magnetic,and acidic properties of cobalt ferrite nanoparticles synthesised by wet chemical methods

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Journal of Advanced Ceramics 2015年第3期4卷 199-205页

作者： Manju KURIAN smitha THANKACHAN Divya s.nair Aswathy E.K. Aswathy BABU Arathy THOMAs Binu KRIsHNA K.T. Department of Chemistry Mar Athanasius CollegeKothamangalam-686666India Department of Physics Mar Athanasius CollegeKothamangalam-686666India

A detailed investigation on the effect of preparation method on the structural,magnetic,and acidic properties of cobalt ferrite nanoparticles prepared by sol-gel and co-precipitation is *** acid and ethylene glycol were used as gelling agents,while sodium hydroxide and aqueous ammonia were used as precipitating *** resulting ferrites were calcined at 450℃ and 750℃.sharper X-ray diffraction(XRD)peaks were observed for the samples calcined at 750℃,indicating greater crystallinity of the samples calcined at higher *** crystallite sizes fell in the ranges of 7.1-21.1 nm and 30.4-42.1 nm for the samples calcined at 450℃ and 750℃,*** infrared spectra revealed two main absorption bands,the high frequency bandν1 around 600 cm^(-1) and the low frequency bandν2 around 400 cm^(-1) arising from stretching vibrations of the oxygen bond with the metal in the tetrahedral(A)and octahedral(B)sites in the spinel *** of particles was observed in the scanning electron microscopy(sEM)*** parameters of CoFe_(2)O_(4) nanoparticles greatly depended on calcination temperature and preparation *** temperature programmed desorption(TPD)measurements indicated that weak acid sites predominate medium strength sites,while the number of strong acid sites is the *** acidity decreased for the samples calcined at higher *** results underline the effect of preparation conditions on the morphology,crystallite size,and magnetic properties of nano ferrites.

关键词： nano ferrites sol-gel technique co-precipitation magnetic property surface acidity

Use of surface Observations to Estimate Upper Air Humidity for the Objective Analysis of Relative Humidity over Indian Region

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Advances in Atmospheric sciences 1990年第4期7卷 491-501页

作者： s.K.sinha D.R.Talwalkar s.G.Narkhedkar P.L.Kulkarni s.nair s.Rajamani Indian Institute of Tropical Meteorology Pune-411008 India Indian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 India

In the present study objective analyses of relative humidity (RH) at surface and at the levels of 850, 700 and 500 hPa have been made using Gandin's (1963) optimum interpolation scheme. As the horizontal resolution of the radiosonde stations is rather inadequate for upper air humidity analysis, a scheme has been developed, following Rasmussen (1982) to estimate the upper air RH from the surface observations like surface RH, present weather and cloud cover. The relative humidities at the levels 850, 700 and 500 hPa were related to the surface observations through three separate regression relations. The RH values at 850, 700 and 500 hPa levels were estimated from the surface RH, cloud coverage and present weather using the above regression relations and subsequently the objective analyses at 00 GMT for the period from 4 July to 8 July 1979, were made using these estimated data along with the observed radiosonde data. Objective analyses were also made for the same period using only the radiosonde data for comparison to study the impact of those estimated data. Root mean square errors were computed for all the five days by interpolating RH at the observing stations from the objectively analysed field and comparing them with the actually observed RH to examine how best the analyses (with and without estimated data) fitted the observations. Lastly they were compared with satellite cloud pictures. This study shows that the estimated upper air RH values have positive impact on the analysis of upper air RH and could be used over radiosonde data sparse region and even over oceanic regions.

关键词： In RH over

The Quest toward limb regeneration:a regenerative engineering approach

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Regenerative Biomaterials 2016年第2期3卷 123-125页

作者： Cato T.Laurencin Lakshmi s.nair Department of Orthopaedic surgery Institute for Regenerative EngineeringRaymond and Beverly Sackler Center for BiomedicalBiologicalPhysical and Engineering SciencesUniversity of Connecticut HealthFarmingtonCT 06030USA Department of Biomedical Engineering University of ConnecticutStorrsCT 06269USA Department of Materials science and Engineering University of ConnecticutStorrsCT 06269USA Department of Chemical and Biomolecular Engineering University of ConnecticutStorrsCT 06269USA Department of Craniofacial sciences School of Dental MedicineUniversity of Connecticut HealthFarmingtonCT 06030USA.

The Holy Grail to address the clinical grand challenge of human limb loss is to develop innovative strategies to regrow the amputated *** remarkable advances in the scientific understanding of regeneration,stem cell science,material science and engineering,physics and novel surgical approaches in the past few decades have provided a regenerative tool box to face this grand challenge and address the limitations of human wound *** we discuss the convergence approach put forward by the field of Regenerative Engineering to use the regenerative tool box to design and develop novel translational strategies to limb regeneration.

关键词： regenerative engineering limb regeneration stem cells advanced biomaterial science clinical translation

Anti-fibrotic drugs dealing with pulmonary fibrosis after COVID-19-associated acute respiratory distress syndrome

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Journal of Acute Disease 2021年第4期10卷 177-178页

作者： Abhijit s.nair sai Kaushik Pulipaka Praveen Kumar Kodisharapu Asiel Christopher Department of Anaesthesiology Ibra HospitalNorth Sharqiya GovernorateIbra-414Sultanate of Oman Department of Anaesthesiology Basavatarakam Indo-American Cancer Hospital and Research InstituteHyderabad-500034Telangana StateIndia

severe acute respiratory syndrome coronavirus 2(sARs-CoV-2),the virus which is responsible for coronavirus disease(COVID-19),uses an angiotensin-2-converting enzyme(ACE2)as a cell receptor in ***,there is interstitial lung damage after infection,and then parenchymal lesions appear,which if not managed appropriately could *** data suggests that around 40%of patients with COVID-19 develop acute respiratory distress syndrome(ARDs),and 20%of these patients who develop ARDs require invasive and advanced modes of ventilation[1].

关键词： ACE2 drugs damage after