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Dynamic time and Location Information in Ciphertext-Policy Attribute-Based Encryption with Multi-Authorization

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Intelligent Automation & Soft Computing 2023年第3期35卷 3801-3813页

作者： P.Prathap Nayudu Krovi raja sekhar Department of Computer Science and Engineering Koneru Lakshmaiah Education FoundationVaddeswaramAP522502India

Due to the mobility of users in an organization,inclusion of dynamic attributes such as time and location becomes the major challenge in Ciphertext-Policy Attribute-Based Encryption(CP-ABE).By considering this challenge;we focus to present dynamic time and location information in CP-ABE with ***ﬁrst,along with the set of attributes of the users,their corre-sponding location is also *** is used to encode the latitude and longitude of the user’s ***,decrypt time period and access time period of users are deﬁned using the new time tree(Ntt)*** Ntt sets the encrypted duration of the encrypted data and the valid access time of the private key on the data user’s private ***,single authorization of attribute authority(AA)is extended as multi authorization for enhancing the effectiveness of key *** results depict that the proposed CP-ABE achieves better encryption time,decryption time,security level and memory ***,encryption time and decryption time of the proposed CP-ABE are reduced to 19%and 16%than that of existing CP-ABE scheme.

关键词： CP-ABE geohash new time tree(Ntt) multi authorization dynamic attribute

Secured Access Policy in Ciphertext-Policy Attribute-Based Encryption for Cloud Environment

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Computer Systems Science & Engineering 2023年第7期46卷 1079-1092页

作者： P.Prathap Nayudu Krovi raja sekhar Department of Computer Science and Engineering Koneru Lakshmaiah Education Foundation VaddeswaramAPIndia

the cloud allows clients to store and share *** on the user’s needs,it is imperative to design an effective access control plan to share the information only with approved *** user loses control of their data when the data is outsourced to the ***,access control mechanisms will become a significant challenging *** Ciphertext-Policy Attribute-Based Encryption(CP-ABE)is an essential solution in which the user can control data ***-ABE encrypts the data under a limited access policy after the user sets some access *** user can decrypt the data if they satisfy the limited access *** CP-ABE is an effective access control program,the privacy of the policy might be compromised by the ***,the attackers can gather important information from plain text *** address this issue,the SHA-512 algorithm is presented to create a hash code for the user’s attributes in this *** on the created hash codes,an access policy will be *** leads to protecting the access policy against *** effectiveness of the proposed scheme is assessed based on decryption time,private key generation time,ciphertext generation time,and data verification time.

关键词： Cloud computing access policy CP-ABE hash code SHA-512 attribute ciphertext encryption decryption

A theoretical study on the elastic deformation of cellular phase and creation of necrosis due to the convection reaction process inside a spherical tumor

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International Journal of Biomathematics 2016年第6期9卷 273-306页

作者： Bibaswan Dey G. P. raja sekhar Department of MathematicsIndian Institute of technology Kharagpur Kharagpur 721302 West Bengal India

Several biological processes, such as convective nutrient transport and convective drug delivery in biological tissues involves the transvascular and interstitial movement of biofluids. this work addresses transvascular and interstitial transport of nutrient inside a spherical tumor. Most of the biological tissues behave like deformable porous materiM and show mechanical behavior towards the fluid motion, due to the fact, that the forces like the drag, which is associated with fluid flow may compress the tissue material. On the macroscopic level, transport of solutes like nutrients, drug molecules, etc. within the tumor interstitial space is modeled. the hydrodynamic problem is treated with biphasic mixture theory under steady state and spherically symmetry situation. the transvascular transport of nutrient is modeled with the modified Sterling＇s equation. the present model describes the overall nutrient distribution and predicts various criteria for the necrosis formation inside the tumor. Present study justifies that the parameters, which controls the nutrient supply to the tumor interstitial space through the blood vessel network inside the tumor, competes with reversible nutrient consumption kinetics of the tumor cells. this study also finds the role of some of those parameters on the deformation of cellular phase of the tumor as a consequence of interstitial fluid flow.

关键词： tumor vasculature isolated tumor biphasic mixture theory effectivenessfactor necrotic core.

Volumetric, Ultrasonic and transport Properties of Binary Liquid Mixtures Containing Dimethyl Formamide at 303.15 K

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Chinese Journal of Chemistry 2007年第1期25卷 32-43页

作者： SYAMALA, Vardhana raja sekhar, Damaramadugu SIVA KUMAR, Kasibhatta VENKAtESWARLU, Ponneri thermochemical Laboratories Department of Chemistry Sri Venkateswara University Tirupati 517 502 India Department of Chemistry SVArts College Tirupati 517 502 India

Excess volumes （v^E）, ultrasonic velocities （u）, isentropic compressibility （△Ks） and viscosities （η） for the binary mixtures of dimethyl formamide （DMF） with 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,2,4-trichlorobenzene, o-chlorotoluene, m-chlorotoluene, p-chlorotoluene, o-nitrotoluene and m-nitrotoluene at 303.15 K were studied. Excess volume data exhibit an inversion in sign for the mixtures of dimethyl formamide with 1,2- and 1,3-dichlorobenzenes and the property is completely positive over the entire composition range for the mixtures of dimethyl formamide with 1,2,4-trichlorobenzene, o-nitrotoluene and m-nitrotoluene. On the other hand, the quantity is negative for the mixtures of dimethyl formamide with chlorotoluenes. Isentropic compressibility （Ks） has been computed for the same systems from precise sound velocity and density data. Further, deviation of isentropic com- pressibility （△Ks） from ideal behavior was also calculated. AKs values are negative over the entire volume fraction range in all the binary mixtures. the experimental sound velocity data were analysed in terms of Free Length theory （FLt） and Collision Factor theory （CFt）. the viscosity data were analysed on the basis of corresponding state approach. the measured data were discussed on the basis of intermolecular interactions between unlike molecules.

关键词： excess volume, dimethyl formamide, interferometer, sound velocity, viscosity molecular interaction

Medicago truncatula resources to study legume biology and symbiotic nitrogen fixation

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Fundamental Research 2023年第2期3卷 219-224页

作者： raja sekhar Nandety Jiangqi Wen Kirankumar S.Mysore Institute for Agricultural Biosciences Oklahoma State University3210 Sam Noble ParkwayArdmoreOK 73401United States USDA-ARS Cereal Crops Research UnitEdward T.Schafer Agricultural Research CenterFargoND 58102United States Department of Biochemistry and Molecular Biology Oklahoma State UniversityStillwaterOK 74078United States

Medicago truncatula is a chosen model for legumes towards deciphering fundamental legume biology,especially symbiotic nitrogen *** genomic resources for *** include a completed whole genome sequence information for R108 and Jemalong A17 accessions along with the sparse draft genome sequences for other 226 *** *** genomic resources are complemented by the availability of mutant resources such as retrotransposon(tnt1)insertion mutants in R108 and fast neutron bombardment(FNB)mutants in *** addition,several *** databases such as small secreted peptides(SSPs)database,transporter protein database,gene expression atlas,proteomic atlas,and metabolite atlas are available to the research *** review describes these resources and provide information regarding how to access these resources.

关键词： Medicago truncatula Model legume Medicago resources tnt1 Mutagenesis Medicago gene atlas

Exact solutions to drift-flux multiphase flow models through Lie group symmetry analysis

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Applied Mathematics and Mechanics(English Edition) 2015年第8期36卷 1105-1112页

作者： B.BIRA t.R.sekhar Department of Mathematics National Institute of Science and Technology Department of Mathematics Indian Institute of Technology Kharagpur

In the present paper, Lie group symmetry method is used to obtain some exact solutions for a hyperbolic system of partial differential equations （PDEs）, which governs an isothermal no-slip drift-flux model for multiphase flow problem. those sym- metries are used for the governing system of equations to obtain infinitesimal transforma- tions, which consequently reduces the governing system of PDEs to a system of ODEs. Further, the solutions of the system of ODEs which in turn produces some exact solutions for the PDEs are presented. Finally, the evolutionary behavior of weak discontinuity is discussed.

关键词： multiphase flow drift-flux models Lie group analysis exact solution weakdiscontinuity

Effects of electron-and hole-current hysteresis on trap characterization in organo-inorganic halide perovskite

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Journal of Energy Chemistry 2023年第1期76卷 414-420,I0010页

作者： Fan Wu Sally Mabrouk Miaomiao Han Yanhua tong tiansheng Zhang Yuchen Zhang raja sekhar Bobba Quinn Qiao School of Science and Huzhou Key Lab of Materials for Energy Conversion and Storage Huzhou UniversityHuzhou 313000ZhejiangChina Mechanical and Aerospace Engineering Syracuse UniversitySyracuseNY13244United States

Charge trap density and carrier mobility of perovskite materials are the critical properties of perovskite solar *** space charge limited current(SCLC)method,which measures a dark current–voltage(I-V)curve of a single-carrier device has found extensive use for studying the trap density and charge carrier mobility in perovskite ***,it was found that the electron-and hole-current in organo-lead perovskite-based single-carrier device undergoes significant hysteresis under forward and reverse scanning due to the mobile *** addition,it was also observed that measuring history has a detrimental effect on hysteresis resulting in possible overestimation or underestimation of the extracted electrical values from the SCLC *** the forward/reverse scanning process,the mobile ionic defects enhance/shield the charge in the traps due to ionic charging/discharging,thereby increasing/reducing the interface barrier and net charge in the I-V scanning,which in turn affects the determination of transport properties of the *** results raise quite a few doubts over the direct application of classical SCLC measurements for the accurate characterization of intrinsic transport properties of the mixed ionicelectronic perovskite.

关键词： Organo-lead perovskite Ionic defects Space-charge-limited-current trap density Mobility

Significance of compaction time delay on compaction and strength characteristics of sulfate resistant cement-treated expansive soil

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第5期13卷 1193-1202页

作者： P.Sriram Karthick raja t.thyagaraj Department of Civil Engineering Indian Institute of Technology MadrasChennai600036India

the addition of cement for stabilization of expansive soils is one of the most commonly used *** with every calcium-based stabilizer,the time delay between the physical mixing of the stabilizer and compaction plays an important role in achieving the desired results after ***,a clear insight on the determination of optimum time delay for achieving the maximum desired compaction properties of cement-stabilized soils is yet to be ***,the recent studies highlighted the use of sulfate to mitigate the negative effect of compaction time *** only drawback with the use of sulfate along with calcium-based stabilizers is the formation of ettringite,which deteriorates the stabilized soil *** view of this,the present study is aimed at using the sulfate resistant cement(SRC)as a stabilizer along with the controlled addition of sulfate solutions to mitigate the negative effect of compaction time delay in stabilizing the expansive *** bring out the above effects,three periods of time delays(0 h,6 h and 24 h)and three sulfate concentrations of 5000 parts per million(ppm),10,000 ppm and 20,000 ppm were *** experimental results showed that the delay in compaction resulted in the formation of clogs and reduction of strength of SRC-stabilized expansive *** sulfate addition to SRC-stabilized expansive soil,the formation clogs was not curtailed and resulted in the formation of ettringite *** formations were captured with the help of scanning electron microscope(SEM)images and validated with electron dispersive X-ray spectroscopy(EDAX)***,an attempt is also made to explain the mechanism of density and strength reduction with the aid of physico-chemical properties and mercury intrusion porosimetry(MIP)studies.

关键词： Compaction time delay Ettringite Sulfate resistant cement(SRC) Mercury intrusive porosimetry(MIP) Sulfate

Ciprofloxacin degradation in photo-Fenton and photo-catalytic processes: Degradation mechanisms and iron chelation

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Journal of Environmental Sciences 2019年第6期31卷 82-92页

作者： Ardhendu sekhar Giri Animes Kumar Golder Department of Chemical Engineering Indian Institute of Science Education and Research Bhopal Department of Chemical Engineering Indian Institute of Technology Guwahati

Ciprofloxacin(CIP)is a broad spectrum synthetic antibiotic drug of fluoroquinolones *** can act as a bidentate ligand forming iron complexes during its degradation in the photoFenton process(PFP).this work investigates on PFP for the degradation of CIP to understand the formation mechanism and stability of iron complexes under ultraviolet(UV)-light illumination.A comparison was made with the UV-photocatalysis(UV/tiO_2)process where CIP doesn't form a *** PFP,the optimal dose of Fe^(2+)and H_2O_2were found to be 1.25 and10 mmol/L with pH of *** optimal tiO_2dose of 1.25 g/L was determined in the UV/tiO_*** CIP removal and mineralization efficiency of 93.1%and 47.3%were obtained in PFP against 69.7%and 27.6%in the UV/tiO_*** mass spectra could identify seventeen intermediate products including iron-CIP complexes in PFP,and only seven intermediate products were found in the UV/tiO_2process with a majority of common products in both the *** proposed mechanism supported by the mass spectra bridged the routes of CIP cleavage in the PFP and UV/tiO_2process,and the decomposition pathway of Fe^(3+)-CIP chelate complexes in PFP was also *** in PFP and UV/tiO_2processes,the target site of HO~·radical attack was the secondary-N atom present in the piperazine ring of the CIP *** death of Escherichia coli bacteria was 55.7%and 66.8%in comparison to the control media after 45 min of treatment in PFP and UV/tiO_2process,respectively.

关键词： Advanced oxidation processes Antibiotic decomposition Iron chelation Antimicrobial activity