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Stability of LRS Bianchi type-I cosmological models in f(R,T)-gravity

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Research in Astronomy and Astrophysics 2019年第4期19卷 63-76页

作者： umesh kumar Sharma Rashid Zia Anirudh Pradhan Aroon Beesham Department of Mathematics Institute of Applied Sciences & Humanities GLA University Department of Mathematical Sciences University of Zululand

This paper examines the stability of the transition from the early decelerating stage of the Universe to the recent accelerating stage for the perfect fluid cosmological locally rotationally symmetric(LRS) Bianchi-I model in f(R, T) theory. To determine the solution of field equations, the idea of a timevarying deceleration parameter(DP) which yields a scale factor, for which the Universe attains a phase transition scenario and is consistent with recent cosmological observations, is used. The time-dependent DP yields a scale factor a=exp■, where β and k are respectively arbitrary and integration constants. By using the recent cons_traints(H_0 _= 73.8, and q_0 =-0.54) from Type Ia Supernova(SN Ia) data in combination with Baryonic Acoustic Oscillations(BAO) and Cosmic Microwave Background(CMB) observations(Giostri et al.), we obtain the values of β = 0.0062 and k = 0.000016 for which we have derived a cosmological model from the early decelerated phase to the present accelerating phase. By applying_ other r_ecent constraints(H_0 = 73.8, q_0 =-0.73) from SNe Ia Union data(Cunha), we obtain the values of β = 0.0036 and k = 0.000084 for which we have derived a cosmological model in the accelerating phase only. We have compared both models with experimental data. The stability of the background solution has been examined also for the metric perturbations alongside the properties of future singularities in a Universe ruled by dark energy with phantom type fluid. We demonstrate the presence of a stable fixed point with a condition of state ω <-1 and numerically affirm this is really a late-time attractor in the ghost overwhelmed Universe. Some physical and geometric properties of the model are found and examined.

关键词： LRS Bianchi-I Universe Time-dependent deceleration parameter f(R,T) gravity theory Transit universe

Sources and implications of particulate organic matter from a small tropical river——Zuari River, India

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Acta Oceanologica Sinica 2020年第4期39卷 18-32页

作者： Dearlyn Fernandes Ying Wu Prabhaker Vasant Shirodkar umesh kumar Pradhan Jing Zhang State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200062China National Institute of Oceanography(Council of Scientific and Industrial Research) Dona PaulaGoa 403004India National Institute of Oceanography(Council of Scientific and Industrial Research) Regional Centre4 BungalowsAndheri(West)400053MumbaiIndia

Transitional ecosystems,estuaries and the coastal seas,are distinctively affected by natural and anthropogenic *** matter(OM)originating from terrestrial sources is exported by rivers and forms a key component of the global biogeochemical *** previous studies focused on the bulk biochemical and anthropogenic aspects affecting these *** the present study,we examined the sources and fate of OM entrained within suspended particulate matter(SPM)of the Zuari River and its estuary,west coast of *** using amino acid(AA)enantiomers(L-and D-forms)as biomarkers,other bulk biochemical parameters *** organic carbon(POC),δ13C,particulate nitrogen(PN),δ15N and chlorophyll a were *** no significant temporal variations were observed in the parameters analyzed;nonetheless,salinity,POC,δ13C,PN,δ15N,glutamic acid,serine,alanine,tyrosine,leucine and D-aspartic acid exhibited significant spatial variability suggesting source *** POC content displayed weak temporal variability with low values observed during the post-monsoon season attributed to inputs from mixed *** samples were less depleted than the riverine samples suggesting contributions from marine plankton in addition to contributions from river plankton and terrestrial C3 plants *** OM was observed during the monsoon and post-monsoon seasons in the estuarine *** degraded OM was noticed during the pre-monsoon *** component analysis was used to ascertain the sources and factors influencing *** five factors were extracted explaining 84.52%of the total *** first component accounted for 27.10%of the variance suggesting the dominance of tidal influence whereas,the second component accounted for heterotrophic bacteria and their remnants associated with the particulate matter,contributing primarily to the AA *** on this study we ascertained the role of the estuarine turbidity max

关键词： Zuari River estuarine turbidity maximum(ETM) suspended particulate matter(SPM) organic matter(OM) amino acids(AA) degradation index(DI)

latrogenic brachial artery injury during anterolateral plat- ing of humeral shaft fracture

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Chinese Journal of Traumatology 2013年第6期16卷 371-374页

作者： Vishal kumar Prateek Behera Sameer Aggarwal umesh kumar Meena Department of Orthopedics Post Graduate Institute ofMedical Education and Research Chandigarh 160012India Department of Orthopedics SMS Medical CollegeJaipur Rajasthan 302001 India

Abstract：There are several well defined indications for surgical management of humeral shaft *** procedures on the humerus are associated with their own *** brachial artery injury as a complication of humeral shaft plating has not been reported *** report a case of a 48 years old femalewho received operation at a district hospital and was referred to us when the surgeon could not palpate the *** angiogram showed that there was segmental non-opacification of the brachial *** was distal reformation and the thrombosis was decided to be managed *** believe that the arterial injury was a result ofimproper surgical technique and the segmental block might be due to improper use of plate holding *** case report makes us aware of a rare complication of operative management of humeral shaft fractures and that basic principles of surgery must be always followed to prevent such injuries。

关键词：肱骨动脉损伤骨折 ING 手术治疗平台并发症

Development of image motion compensation system for 1.3 m telescope at Vainu Bappu Observatory

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Research in Astronomy and Astrophysics 2020年第1期20卷 93-106页

作者： Sreekanth Reddy Vallapureddy Ravinder kumar Banyal Sridharan Rengaswamy P umesh Kamath Aishwarya Selvaraj Indian Institute of Astrophysics

We developed a tip-tilt system to compensate the turbulence induced image motion for the 1.3 m telescope at Vainu Bappu Observatory,at *** instrument is designed to operate at the visible wavelength band(480-700 nm)with a field of view of 1′×1′.The tilt corrected images have demonstrated up to ≈57% improvement in image resolution and a corresponding peak intensity increase by a factor of ≈2.8.A closed-loop correction bandwidth of ≈26 Hz has been achieved with on-sky tests and the root mean square motion of the star image has been reduced by a factor of ~*** results are consistent with theoretical and numerical predictions of wave-front aberrations caused by atmospheric turbulence and image quality improvement expected from a real-time control *** this paper,we present details of the instrument design,laboratory calibration studies and quantify its performance on the telescope.

关键词： adaptive optics atmospheric effects high angular resolution

Habitat heterogeneity influences avian feeding guild composition in urban landscapes:evidence from Bhubaneswar,India

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Ecological Processes 2021年第1期10卷 418-427页

作者： Bibhu Prasad Panda B.Anjan kumar Prusty Biswajit Panda Abanti Pradhan Siba Prasad parida Environmental Sciences Department of Chemistry and BBRCITERSiksha‘O’Anusandhan(Deemed to be University)BhubaneswarOdishaIndia Department of Natural Resources Management and Geoinformatics Khallikote UniversityBerhampurOdishaIndia Department of Stem Cell Facility All India Institute of Medical SciencesNew DelhiIndia Department of Zoology School of Applied SciencesCenturion University of Technology and ManagementBhubaneswarOdishaIndia.

Background:Habitat heterogeneity clearly distinguished in terms of availability of food and habitat resources and landscape features(natural or human-modified)play a crucial role in the avian species composition and population *** examine this,a study was carried out in Bhubaneswar,India,to understand the ecological niche distinction in birds based on habitat *** sampling was conducted in 30 sampling sites covering six different habitat types in a predominantly urban landscape of Bhubaneswar for understanding the ecological niche in *** birds were classified into 11 types of foraging ***:The insectivorous guild had the highest bird species richness(181 species)and the omnivorous guild had the lowest(11 species).The piscivorous guild and wetland habitat had the strongest linkage,followed by the insectivorous guild and agricultural *** frugivorous guild was significantly correlated with forest habitats(r=0.386,p<0.01)and park and garden habitats(r=0.281,p<0.01).This urban area hosted a higher number of bird species in certain habitat types,viz.,agricultural lands(52%,115 species)and forest patches(50%,111 species).Conclusion:The present study highlights the importance of agricultural lands,forest patches,parks and gardens,and wetlands inside the cityscape for supporting *** is therefore suggested that such habitats should be conserved inside an urban area to protect native ***,the city development plan must invariably include strategies for conserving the forest patches inside the urban *** must be taken to restrain the degradation of agricultural lands and reduce their utilization for non-agricultural purposes,which will help in further reducing the bird population decline in the urban landscape.

关键词： Bird species richness Community structure Feeding guild Habitat characteristics Urban area

Vibration energy harvesting:A review

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Journal of Advanced Dielectrics 2019年第4期9卷 1-17页

作者： Anwesa Mohanty Suraj parida Rabindra kumar Behera Tarapada Roy National Institute of Technology RourkelaIndia

This study is based on energy harvesting from vibration and deals with the comparison of different *** the present scenario,energy harvesting has drawn the attention of researchers due to a rapid increase in the use of wireless and small-scale ***,there is a huge thirst among scientists to develop permanent portable power *** the surroundings,a lot of unutilized energy is wasted which can be collected and used for power *** works have been extensively carried out to develop energy harvesting devices catering to the increasing needs of being efficient and *** energy harvesting mainly depends on the design of the *** types of design techniques,material properties,and availability of energy harvesters are reviewed in this *** paper aims to explore the advantages and limitations of different energy harvesting principles,advances,and findings of the recent *** study also discusses some of the key ideas for the enhancement of power *** paper provides a broad view of the energy harvesting system to the learners,which will facilitate them to design more efficient energy harvesting devices by using different principles.

关键词： Electromagnetic piezoelectric electrostatic magnetostrictive.

Submental island flap reconstruction for carcinoma of the oral cavity: Experience in 30 cases

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World Journal of Otorhinolaryngology-Head and Neck Surgery 2019年第2期5卷 65-70页

作者： Pradeep Pradhan Swagatika Samal Dillip kumar Samal Chappity Preetam Pradipta kumar parida Department of Otorhinolaryngology All India Institute of Medical SciencesBhubaneswarOdisha751019India Department of Pathology All India Institute of Medical SciencesBhubaneswarOdisha751019India

Objective:The submental flap can be utilized for soft tissue reconstruction in oral cavity malignancies because due to its close approximation to the surgical site,fewer donor site morbidity and the cost effectiveness of the ***:A total of 30 patients with squamous cell carcinoma of the oral cavity were included in the study from July 2012 to August 2015 in a tertiary care referral *** with clinical staging Ⅰ/Ⅱ/Ⅲ (T1/T2/T3,N0) oral malignancy were included in the *** with nodal metastasis irrespective of the stage of disease and patients with chronic medical illness/revision cases were excluded from the *** island flap was utilized for the reconstruction of the soft tissue defect in each *** were followed at monthly interval till 6 months in the postoperative ***:The buccal mucosa (12 patients),tongue (10 patients) and floor of mouth (8 patients) were the subsites in the oral *** and complete skin necrosis was found in 4 and 2 patients *** chemoradiation was required in 5 *** of the patients had loco regional recurrence till 6 months of ***:The submental island flap is considered to be the reliable option for the soft tissue reconstruction in oral cancer because of dependent vascular pedicle,less donor site morbidity and the lower cost compared to the free flaps,often preferred in patients with a lower socioeconomic condition.

关键词： Oral malignancies Submental island flap Surgical technique Outcome

Andrographolide inhibits chikungunya virus infection by up-regulating host innate immune pathways

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Asian Pacific Journal of Tropical Medicine 2018年第3期11卷 214-221页

作者： Swati Gupta Kamla Prasad Mishra Paban kumar Dash Manmohan parida Lilly Ganju Shashi Bala Singh Defence Institute of Physiology & Allied Sciences Defence Research and Development Establishment

Objective: To investigate the therapeutic efficacy of andrographolide, a plant derived compound, against chikungunya virus(CHIKV) infection. Methods: Using flow cytometry and immunoblotting assay, in vitro viral protein expression was studied in THP-1 cells line. In Balb/c mouse neonates, viral RNA copy number was determined by real time PCR. Results:The results showed reduced CHIKV protein expression on andrographolide treatment in CHIKV-infected human peripheral blood mononuclear cells, Vero cells and THP-I cell *** vivo, andrographolide treatment to CHIKV-infected neonates reduced viral RNA copy number. Further. andrographolide also increased cytotoxic T lymphocytes both in vitro and in vivo. Andrographolide also activated host innate immune pathways, viz., protein kinase *** eukaryotic initiation factor 2 α, retinoic acid inducible gene-Ⅰ and interferon regulatory factor 3/7, thereby increasing IFN-a secretion. CHIKV-induced nuclear factor κlight chain enhancer of activated B cells and tumor necrosis factor-a was also reduced on andrographolide treatment. Conclusion: Andrographolide inhibits CHIKV by suppressing viral protein expression and up-regulating host innate immunity and hence could be an effective therapeutic agent against CHIKV infection.

关键词： Chikungunya virus Andrographolide Interferon α Protein kinase R Retinoic acid inducible gene-I Tumor necrosis factor α

The Journey of SRS: An Initial Experience of Starting Sterotactic Radiosurgery Facility at Purbanchal Cancer Hospital—First in Nepal

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2023年第2期12卷 37-50页

作者： Birendra kumar Yadav Karthik Nagamuthu Alok Thakur Kushal Rizal umesh kumar Sharma Ujwal Rai Dinesh Thapa Shishir Thapa kumar Chinnappan Amit kumar Dubey Suraj Gurung Aman Yadav Utpalkant kumar Ranjay kumar Department of Radiation Oncology Purbanchal Cancer Hospital Jhapa Nepal Department of Radiology Purbanchal Cancer Hospital Jhapa Nepal Deapartment of Pathology Purbanchal Cancer Hospital Jhapa Nepal Department of Neurosurgery Purbanchal Cancer Hospital Jhapa Nepal

Introduction: Radiotherapy (RT) is a vital cancer treatment modality for both curative and palliative purposes. Nepal is a developing country with a population of around 30 million people. Cancer affects 100 - 120 people out of every 100,000, and the figure is increasing. The number of radiation facility machines in the country is still countable in fingers. Purbanchal Cancer Hospital, Nepal is the first comprehensive cancer facility capable of performing stereotactic radiosurgery (SRS). Our facility has cutting-edge Varian Truebeam Linear Accelerators with millennium MLC, which makes SRS and SRT’S for intracranial lesions such as small benign and malignant tumors much easier. In addition to SRS, we are the pioneers of SBRT for lung using 4DCT, interstitial & intraluminal brachytherapy, RPM Gated & DIBH modalities in Nepal. Methods & Materials: The purpose of this study is to share our experience in establishing an SRS facility in the country, which includes training the RT team on the importance of process accuracy, patient selection, patient assessment, mould preparation, and describing image data acquisition, target, and organ at risk delineation on CT and MRI images, treatment planning process, and quality assurance. Results & Discussion: The plans for all SRS and SRT cases are based on target coverage, OAR sparing, hotspot inside the target, conformity index, heterogeneity index, and dose fall off. To select the final plan, we used strict passing criteria such as a conformity index Paddick (CIPaddick) more than 0.85, a falloff between 100% and 50% of less than 5.5 mm (maximum 6 mm in irregular targets), and a hotspot inside the target between 115 to 140 percent, as per clinical standards. In addition, we determined the CILomax and CIRTOG for each case. Passing criteria for verification plans are set as minimum of 95% for a 2% percentage dose difference (% DD) and a 2-mm distance to an agreement (DTA). We also gathered demographic data from patients treated in t

关键词： Conformity Index Double Shell Positioning System Electronic Portal Imaging Device Linear Accelerator Millennium MLC Octavius Detector 1500 Setup Field