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Robust Watermarking Scheme for NIfTI Medical Images

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Computers, Materials & Continua 2022年第5期71卷 3107-3125页

作者： abhishek kumar Kamred Udham Singh Visvam Devadoss Ambeth kumar Tapan Kant Abdul Khader Jilani Saudagar Abdullah Al Tameem Mohammed Al Khathami Muhammad Badruddin Khan Mozaherul Hoque Abul Hasanat Khalid Mahmood Malik School of Computer Science and IT JAIN(Deemed to be University)Bangalore560069India Department of Computer Science and Information Engineering National Cheng Kung UniversityTainan701Taiwan Department of Computer Science&Engineering Panimalar Engineering CollegeAnna UniversityChennai600123India Patna Women’s College Patna800001India Information Systems Department College of Computer and Information SciencesImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11432Saudi Arabia Department of Computer Science and Engineering Oakland UniversityRochester48309USA

Computed Tomography(CT)scan and Magnetic Resonance Imaging(MRI)technologies are widely used in medical *** the last few months,due to the increased use of CT scans,millions of patients have had their CT scans ***,as a result,images showing the Corona Virus for diagnostic purposes were digitally transmitted over the *** major problem for the world health care system is a multitude of attacks that affect copyright protection and other ethical issues as images are transmitted over the *** a result,it is important to apply a robust and secure watermarking technique to these ***,watermarking schemes have been developed for various image formats,***,.bmp,***,but their impact on NIfTI(Neuroimaging Informatics Technology Initiative)images is not noteworthy.A watermarking scheme based on the Lifting Wavelet Transform(LWT)and QR factorization is presented in this *** LWT and QR are combined,the NIfTI image maintains its inherent sensitivity and mitigates the watermarking scheme’s *** watermarks are added to the host image in this *** the performance of the graphics card is done by using PSNR,SSIM,Q(a formula which measures image quality),SNR,and Normalized *** watermarking scheme withstands a variety of noise attacks and conversions,including image compression and decompression.

关键词： Watermarking NIfTI LWT QR image security

Effect of Ficus benghalensis Latex Based Combinatorial Formulations on Various Bio-Molecules in Indian White Termite Odontotermes obesus

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Journal of Biosciences and Medicines 2023年第4期11卷 82-102页

作者： abhishek kumar Tripathi Ravi Kant Upadhyay Department of Zoology Deen Dayal Upadhyaya Gorakhpur University Gorakhpur India

In present investigation, various bioassays were conducted to evaluate the alteration in levels of certain biomolecules, such as glycogen, protein, amino acid, DNA, RNA and lipids. For this purpose, worker termites were treated with sub-lethal dose 40% and 80% of 24 hrs LD50 values and observations were taken at 4 hrs interval up to 24 hrs. Crude latex and its combinatorial mixtures, like S-MLT-A, B-MLT-A, C-MLT-A, CU-MLT-A, AQ-MLT significantly altered level of bio-molecules in Odontotermes obesus. This effect was found time and dose dependent. Reduction or increase in biomolecules was calculated by using corresponding control. Maximum decrease in glycogen level was observed at 16 h when termites were treated with 80% of LD50 of Ficus benghalensis aqueous extract i.e. 56.88% at 16 h of treatment. A similar dose caused very slight decrease in lipid contents at 4 h of treatment but it was found further significantly (p > 0.05) decreased in other successive treatments. 40% and 80% of LD50 of C-MLT-B mixture caused significant (p > 0.05) decrease in DNA and RNA level at 16 h treatment. The level of DNA and RNA level was recorded 83.90%, 90.18% and 85.42% and 74.05% respectively. Similarly, total proteins were also found to be decreased with 40% and 80% of LD50 of C-MLT-B mixture i.e. 71.47% and 66.45% respectively. All these alterations found in levels of various bio-molecules confirm the action of latex ingredients on worker termites that was antifeedant or deterrent types. These ingredients can be used to control not only termites but also other phytophagous insects in a sustainable and eco-friendly way.

关键词： Ficus benghalensis Odontotermes obesus Latexes Antifeedant or Deterrent Termiticides

Toxic Effects of Ficus benghalensis Latex Based Combinatorial Formulations on Various Enzymatic Parameters in Indian White Termite Odontotermes obesus

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Advances in Enzyme Research 2023年第2期11卷 34-57页

作者： abhishek kumar Tripathi Ravi Kant Upadhyay Department of Zoology Deen Dayal Upadhyaya Gorakhpur University Gorakhpur India

In the present investigation, various bioassays were conducted to evaluate the alteration in levels of various enzymes i.e. alkaline phosphatase, acid phosphatase, glutamate oxaloacetate transaminase, glutamate pyruvate transaminase and acetylcholinesterase. For this purpose worker termites were treated with sub-lethal doses of 40% and 80% of 24 hrs LD50 of latex-based combinatorial formulations and observations were taken at 4 hours intervals up to 24 hours. Ficus benghalensis crude latex and its combinatorial mixtures, like C-MLT-A, CU-MLT-A, AQ-MLT, P-MLT and EA-MLT significantly altered the level of enzymes in Odontotermes obesus and this effect found time and dose-dependent. Reduction or increase in enzymes was calculated by using the corresponding control. The maximum decrease in acid phosphatase level was observed at 16 h when termites were treated with 80% of LD50 of B-MLT-B and P-MLT i.e. 82.84% at 16 h of treatment. A similar dose caused a very slight decrease in glutamate pyruvate transaminase at 4 h of treatment but with the increase in time. Further decrease was noted in other successive treatments that were significant at p > 0.05. Similarly, 40% and 80% of LD50 of the C-MLT-B mixture caused significant (p > 0.05) decrease in alkaline phosphatase and acid phosphatase level at 16 h treatment i.e. 93.42%, 89.46% and 95.89%, 88.17% respectively. The level of acetylcholinesterase was also found to be decreased when termites were treated with 40% and 80% of LD50 of C-MLT-B mixture i.e. 92.72% and 97.27% respectively. All the above alterations noted in levels of various enzymes confirm the action of latex ingredients on worker termites that were anti-feedant or deterrent types. These ingredients can be used to control not only termites but also other phytophagous insects.

关键词： Ficus benghalensis Enzymes Alteration Odontotermes obesus Latexes Anti-Feedant Termiticides

Surface Photografting of Novel Sulfobetaine Copolymers on Silica

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Materials Sciences and Applications 2012年第7期3卷 467-477页

作者： abhishek kumar Nazia Tarannum Meenakshi Singh Department of Chemistry MMV Banaras Hindu University Varanasi-221005 INDIA

A couple of novel sulfobetaine copolymer is developed via Michael-type addition reaction. The comonomers, diamines and maleimide react via Michael reaction through UV irradiation using AIBN as photoinitiator producing polyamine chain. Further, sulfobetaine copolymers were obtained on treatment of the polyamine with sulfopropylating agent, 1,3-propane sultone. These novel sulfobetaine polymers were grafted on silica surface to produce responsive biocompatible surface. This easy straightforward, catalyst free facile protocol for synthesis of polymer grafted surface is useful for developing biomedical devices. Additionally, both the copolymers show fluorescence characteristics.

关键词： Copolymer Sulfobetaine Zwitterionic Grafted Copolymer Photopolymerization Maleimide Michael-Type Reaction Surface Initiated Polymerization (SIP) Density Functional Theory (DFT) Fluorescence

Performance of magnetorheological elastomer based torsional vibration isolation system for dynamic loading conditions

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Journal of Central South University 2020年第1期27卷 144-154页

作者： PRAVEEN Shenoy K KUCHIBHATLA Sai Aditya Raman SINGH abhishek kumar GANGADHARAN K V Department of Mechanical Engineering National Institute of Technology KarnatakaSurathkalMangalore-575025India Centre for System Design National Institute of Technology KarnatakaSurathkalMangalore-575025India

Vibration isolation is an effective method to mitigate unwanted disturbances arising from dynamic loading conditions. With smart materials as suitable substitutes, the conventional passive isolators have attained attributes of semi-active as well as the active control system. In the present study, the non-homogenous field-dependent isolation capabilities of the magnetorheological elastomer are explored under torsional vibrations. Torsional natural frequency was measured using the serial arrangement of accelerometers. Novel methods are introduced to evaluate the torsional stiffness variations of the isolator for a semi-definite and a motor-coupled rotor system. For the semi-definite system, the isolation effect was studied using the frequency response functions from the modal analysis. The speed-dependent variations for motor-coupled rotor system were assessed using the shift in frequency amplitudes from torque transducers. Finite element method magnetics was used to study the variations in the non-homogenous magnetic field across the elastomer. The response functions for the semi-definite rotor system reveal a shift in the frequency in the effect of the magnetic field. Speed-dependent variations in the frequency domain indicate an increment of 9% in the resonant frequency of the system.

关键词： torsional vibration isolation semi-definite system magnetorheological elastomer speed-dependent isolation

Fabrication of Graphitic Carbon Nitride-Based Film:An Emerged Highly Efficient Catalyst for Direct C-H Arylation under Solar Light

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Chinese Journal of Chemistry 2021年第3期39卷 633-639页

作者： Surabhi Chaubey Rajesh K.Yadav Tae Wu Kim Tara Chand Yadav abhishek kumar D.K.Dwivedi B.K.Pandey Atul P.Singh Department of Chemistry and Environmental Science Madan Mohan Malaviya University of TechnologyGorakhpur-273010U.PIndia Center for Nanomaterials and Chemical Reactions Institute for Basic Science(IBS)Daejeon 34141Republic of Korea Department of Chemistry Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Biotechnology Indian Institute of Technology Roorkee-247667India Department of Chemistry Institute of ScienceBanaras Hindu UniversityIndia Department of Physics and Material Science Madan Mohan Malaviya University of TechnologyGorakhpur 273010U.PIndia Department of Chemistry Chandigarh UniversityMohaliIndia

Main observation and conclusion Photoredox C-H bond formation can proceed in aerobic environment under solar light and has therefore become ***-days,different types of expensive novel metal complexes and nanomaterials have been urbanized as photocatalysts for direct C-H bond formation in between derivatives of heteroarenes(HAs)and aryl diazonium *** photocatalysts,however,still suffer from poor stability,high cost,and ***,a graphitic carbon nitride-based fluorescein isothiocyanate(g-C_(3)N_(4)-FITC)film pho-tocatalyst has been reported,which shows ecellent light harvesting ability,and band gap suitability to catalyze the metal free direct C-H arylation of HAs under solar light at ambient ***,the g-C_(3)N_(4)-FITC film photocatalyst can be reused four times without significant loss of activity,confirming the excellent photocatalytic *** current strategy to constructa g-C_(3)N_(4)-FITC film photocatalyst for direct C-H arylation opens a new path towards replacing metal-based catalysts in fine chemical Sy nthesis.

关键词： Photocatalysis g-C_(3)N_(4)-FITC film photocatalyst C-H activation Heteroarenes Cyclic voltammetry

Missed posterior shoulder dislocation with malunited proximal humerus fracture

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Chinese Journal of Traumatology 2013年第6期16卷 375-378页

作者： Sunil kumar Rajesh kumar Chopra abhishek Kashyap Sumit Arora Central Institute of Orthopaedics Vardhman MahavirMedical College & Safdarjung Hospital New Delhi 110029India

Posterior dislocation of the shoulder may be missed or neglected at initial presentation especially in developing *** present a case of 40-year-old Indian man who had 3-month missed posterior dislocation of the right shoulder along with malunited fracture of the anatomical neck of the *** reduction and stabilization with modified McLaughlin procedure was *** osteotomy of proximal humerus had to be performed as supplementary procedure to keep the humeral head stable in glenoid cavity during functional range of *** patient had excellent result of the shoulder at 3 years follow-up.

关键词： Shoulder dislocation Humerus Os-teotomy

含MF2: Yb3+，Er3+和ZnAl2O4 ：Cr3+多相玻璃陶瓷的制备与荧光温度传感性能研究

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含MF2: Yb3+，Er3+和ZnAl2O4 ：Cr3+多相玻璃陶瓷的制备与荧光温...

作者： abhishek kumar Wadhwa 浙江大学

学位级别：硕士

光学温度传感材料具有抗电磁干扰能力强和适用极端工作环境的巨大优势,因此在生物传感。航空航天以及科学实验中显示出重要应用前景。开发双模式温度传感材料,例如兼具荧光强度和荧光寿命测温的双模式荧光温度传感,对提高荧光温度传感... 详细信息

光学温度传感材料具有抗电磁干扰能力强和适用极端工作环境的巨大优势,因此在生物传感。航空航天以及科学实验中显示出重要应用前景。开发双模式温度传感材料,例如兼具荧光强度和荧光寿命测温的双模式荧光温度传感,对提高荧光温度传感器件的精确度具有重要意义。但是,双模式荧光温度传感往往依赖于两种不同的发光中心,将其共掺于同一种材料中会导致由二者能量传递引起的发光猝灭。为了解决这个问题,本论文采用氟氧化物多相玻璃陶瓷体系,分别将具有荧光强度比温度依赖的Er3+和具有荧光寿命温度依赖的Cr3+隔离于玻璃陶瓷的MF2(M=Ca,Sr)析晶相和ZnAl2O4析晶相,有效抑制了Er3+和Cr3+之间发光猝灭,实现了基于Er3+荧光强度比和Cr3+荧光寿命的高性能温度传感。首先,采用SiO2-Al2O3-ZnF2-CaF2-ErF3-CrF3体系,通过高温熔融-急冷成型的方法制备了Er3+/Cr3+共掺的玻璃,并经热处理获得了含有CaF2和ZhnAl2O4析晶相的多相玻璃陶瓷。X射线衍射(XRD)、透射电子显微镜(TEM)和X射线能量散射谱扫描(EDX mapping)研究表明,Er3+和Cr3+分别被选择性地富集于CaF2和ZnAl2O4中。光谱分析(PL)表明,在980 nm半导体激光激发下,Er3+产生了由2H11/2,4S3/2→4I15/2跃迁引起的绿色上转换荧光(UC),在396 nm的Xe灯激发下,Cr3+产生了由2E,4T2-→4A2跃迁引起的红色下转换发光(DC)。变温荧光光谱测试表明,Er3+的上转换荧光来自热耦合能级2H11/2和4S3/2,二者荧光强度比具有明显温度依赖关系。采用最小二乘法拟合的FIR(T)关系表明,利用玻璃陶瓷中Er3+荧光强度比的温度依赖的最大温度敏感系数在437 K和267 K分别可达到0.33%K-1和0.36%K-1。同时,变温荧光寿命测试表明,Cr3+的红光荧光寿命具有明显温度依赖关系。采用最小二乘法拟合的CT关系表明,利用玻璃中Cr3+荧光寿命的最大温度依赖关系的温度敏感系数在535 K可达0.67%K-1。其次,采用Si02-A1203-ZnF2-CaF2-YbF3-ErF3-CrF3体系,通过高温熔融-急冷成型的方法制备了 Yb3+/Er3+/Cr3+共掺的玻璃,并经热处理获得了含有SrF2和ZnAl2O4析晶相的多相玻璃陶瓷。X射线衍射(XRD)、透射电子显微镜(TEM)和X射线能量散射谱扫描(EDX mapping)研究表明,Yb3+/Er3+和Cr3+分别被选择性地富集于SrF2和ZnAl2O4中。光谱分析(PL)表明,在980 nm半导体激光激发下,Er3+产生了由2H11/2,4S3/2→4115/2跃迁引起的绿色上转换荧光(UC),在535 nm半导体激光激发下,Cr3+产生了由2E,4T2-→4A2跃迁引起的红色下转换发光(DC)。变温荧光光谱测试表明,Er3+的上转换荧光来自热耦合能级2H11/2和4S3/2,二者荧光强度比具有明显温度依赖关系。采用最小二乘法拟合的FIR(T)关系表明,利用玻璃陶瓷中Er3+荧光强度比的温度依赖的最大温度敏感系数在334 K和275 K分别可达到1.11%K-1和0.66%K-1。同时,变温荧光寿命测试表明,Cr3+的红光荧光寿命具有明显温度依赖关系。采用最小二乘法拟合的CT关系表明,利用玻璃中Cr3+荧光寿命的最大温度依赖关系的温度敏感系数在435 K可达0.19%K-1。

关键词：多相微晶玻璃光学温度传感发光稀土过渡金属上转换

Double level Chance-type fractures of spine in ankylosing spondylitis

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Chinese Journal of Traumatology 2014年第6期17卷 361-363页

作者： Gauresh Shantaram Vargaonkar Varun kumar Singh abhishek Kashyap Ramesh kumar Central Institute of Orthopaedics Vardhman Mahavir Medical College & Safdarjung Hospital New Delhi 110029 India

Chance fractures are usually associated with seat belt injuries. Mechanism is always related to flexion-distraction at vertebral level. Double level Chance-type fractures have rarely been reported in published literature. We presented such a fracture at D10 and L3 level in a 38-year-old patient with ankylosing spondylitis. Management was done with posterior decompression and short segment fixation separately.

关键词： Chance fractures Ankylosing spondylitis Spine