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Search Results: 1 - 10 of 44360 matches for " Ashoke Kumar Paul "
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Quality Control of Gamma Camera with SPECT Systems  [PDF]
Md. Razibul Hasan, Md. Harunor Rashid Khan, Md. Rashedur Rahman, Md. Shohel Parvez, Md. Rakibul Islam, Ashoke Kumar Paul
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2017, DOI: 10.4236/ijmpcero.2017.63021
Abstract: Quality control of Gamma Camera with SPECT System is highly valuable for assurance performance characteristic. We report the performance characteristic of gamma camera by intrinsic calibration and verification measurement. The study has been done using the data from Siemens Symbia S Series gamma camera by using a point source 99mTc at the Institute of Nuclear Medicine & Allied Sciences (INMAS), Khulna, Bangladesh. From intrinsic calibration and verification flood series, the integral uniformity for the central field of view (CFOV) has been found in between 4.01% and 2.88% and for the useful field of view (UFOV) has been in between 4.77% and 4.30%. The differential uniformity for the CFOV has been in between 1.53% and 2.04% and for the UFOV has been in between 2.32% and 2.77%. According to Operating Instruction Symbia System S Series manual, uniformity can compensate for values exceeding 10%, however while integral uniformity exceed 7%, have to contract Siemens customer service representative. In conclusion, these results show that the intrinsic uniformity of the gamma camera under this condition is within an acceptable range; thus the gamma camera working in INMAS is performed well.
In vitro Antibacterial Activity of Bioactive Potent Compounds from Terminalia chebula against Some Common Human Pathogens  [PDF]
Shuvo Datta, Nishith Kumar Pal, Ashoke Kumar Nandy
Pharmacology & Pharmacy (PP) , 2017, DOI: 10.4236/pp.2017.89021
Abstract: Objective: Emergence of community-acquired infections due to multi drug resistant (MDR) common human pathogens have caused a great problem to clinicians and this directed us to search systematically for a different remedy with compounds particularly from plant origin. Methods: The antibacterial activity was evaluated using agar well diffusion assay method against some common gram positive and gram negative bacteria. Results: In vitro study with Terminalia chebula Retz. (Combretaceae) stem bark extracts, eight isolated triterpenoids and four triterpenoid derivatives were found to be effective against Bacillus subtilis, Staphylococcus aureus, Salmonella typhi, Pseudomonas aeruginosa and Escherichia coli. Conclusions: Pure compounds from T.chebula could be effectively used as antibacterial agents if it is possible to develop the molecules synthetically. At the same time crude extracts with specified active principles could also be used and/or introduced in Traditional Medicine/Complementary Alternative Medicine (TM/CAM) as antibacterial into National/International Health Systems as per the guideline of Ayurvedic formularies.
Floral Biology, Floral Resource Constraints and Pollination Limitation in Jatropha curcas L.
Ashoke Bhattacharya,Kalyani Datta,Subodh Kumar Datta
Pakistan Journal of Biological Sciences , 2005,
Abstract: The present study deals with the floral biology, floral visitors and pollination of Jatropha curcas L. (Euphorbiaceae). Forenoon pattern of anthesis with subsequent pollen release was noticed. Each male flower produced 1617 100 pollen with P:O ratio as 539:1. The stigmas become receptive 2 h after anthesis with morphological differentiation. Nectar secretion coincided with pollen presentation schedule and stigma receptive duration. Each female flower produced higher amount (4.54 ± 0.82 μL) of nectar than male flower (1.92 ± 0.44 μL) in 1200 h. Fifty percent of female flowers set fruit with 53% fecundity rate, 32% apomixis rate and 2:3 seed-ovule ratio. The flowers attracted the insect visitors of Hymenoptera (Apis dorsata, A. florea, A. mellifera, Eumenes conica and Vespa sp.) and Coleoptera (Beetles). Among the different insect visitors Apis spp. were most frequent. It has been observed that the different grades of sucrose have an influence on insect behaviour, flower visits duration, pollen removal and deposition on stigmas by honeybees (Apis spp.). Highest number of pollen grains were transported and deposited on stigmas by A. dorsata when flowers were treated with 0.9 M sucrose, whereas, it was lowest by A. florea in 1.5 M sucrose treated flowers.
Phytochemical Screening and Analgesic activity of “Kantkari”
Atul Kumar Gangwar,Ashoke K.Ghosh,Vikas Saxena
International Journal of Herbal Medicine , 2013,
Abstract: Solanum xanthocarpum schrad. & wendl., commonly known as Kantkari ,belonging to Family Solanaceae, contains steroidal glycoalkaloid solasodine, β-solamagrine and solasonine. The indigenous uses of plants also indicate anti-inflammatory, Antispermatogenic, Antidiabetic, Antiasthmatic, Molluscidal activity, useful in infantile atopical dermatitis, Cytoprotective, anticancer, insecticidal, diuretic activities of plant. The present studies showed that Petroleum Ether Extract (PEE) and Alcoholic Extract (AE) were investigated by TLC, HPTLC, IR and NMR.
Logarithmic Corrections to N=4 and N=8 Black Hole Entropy: A One Loop Test of Quantum Gravity
Shamik Banerjee,Rajesh Kumar Gupta,Ipsita Mandal,Ashoke Sen
Physics , 2011, DOI: 10.1007/JHEP11(2011)143
Abstract: We compute logarithmic corrections to the entropy of supersymmetric extremal black holes in N=4 and N=8 supersymmetric string theories and find results in perfect agreement with the microscopic results. In particular these logarithmic corrections vanish for quarter BPS black holes in N=4 supersymmetric theories, but has a finite coefficient for 1/8 BPS black holes in the N=8 supersymmetric theory. On the macroscopic side these computations require evaluating the one loop determinant of massless fields around the near horizon geometry, and include, in particular, contributions from dynamical four dimensional gravitons propagating in the loop. Thus our analysis provides a test of one loop quantum gravity corrections to the black hole entropy, or equivalently of the AdS_2/CFT_1 correspondence. We also extend our analysis to N=2 supersymmetric STU model and make a prediction for the logarithmic correction to the black hole entropy in that theory.
Customized Foot Orthosis Development by 3D Reconstruction of the CT Images  [PDF]
Sathish Kumar Paul, Sudesh Sivarasu, Lazar Mathew
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.410088
Abstract: Clinicians can provide a means to better distribute the pressure around the foot, and can also correct the biomechanics of the foot by using a customized shoe insole. If detected early enough, orthopedic insoles can correct or prevent further complications. In this study the 3 Dimensional (D) model of the foot was used to fabricate a customized orthosis. The Computed Tomography (CT) images of patient’s foot having no muscle weakness and joint restriction were acquired. The gray intensities corresponding to the bones of the foot from the CT images were 3 dimensionally reconstructed. The 3D model of the foot was then imported into the CAD Software. Boolean operations were carried out in between the 3D foot model and a solid rectangular surface to create a customized foot orthosis. The exact contours and shape of the subject’s foot was acquired using the computerized method of fabricating an orthosis. The novel idea described in this study support, automating the process of designing a customized orthosis with the impression got from the 3 dimensionally modeled feet, thereby reducing the modeling time considerably. The simple technique used in this process will help in giving comfort and stability to the patient’s feet while walking.
Current Mode Universal Filter Using Single Current Controlled Differential Difference Current Conveyor Transconductance Amplifier  [PDF]
Ajay Kumar Kushwaha, Sajal K. Paul
Circuits and Systems (CS) , 2015, DOI: 10.4236/cs.2015.610023
Abstract: This research paper contains a new electronically tunable current-mode biquadratic universal filter using a new active building block; current controlled differential difference current conveyor transconductance amplifier (CCDDCCTA). The proposed filter provides the following important and desirable features: (i) One can use only one CCDDCCTA and two capacitors; (ii) One can get low pass (LP), band pass (BP), high pass (HP), notch (NF) and all pass (AP) current responses from the same configuration without any alteration; (iii) Passive components are grounded, which ease the integrated circuit implementation; (iv) Responses are electronically tunable; and (v) Sensitivity is low. Moreover, the non-ideality analysis shows that the parasitic passive components can be compensated for the proposed circuit. The functionality of the design is verified through SPICE simulations using 0.25 μm CMOS TSMC technology process parameters. Simulation result agrees well with the theoretical analysis.
State Operator Correspondence and Entanglement in AdS2/CFT1
Ashoke Sen
Entropy , 2011, DOI: 10.3390/e13071305
Abstract: Since Euclidean global AdS 2 space represented as a strip has two boundaries, the state-operator correspondence in the dual CFT 1 reduces to the standard map from the operators acting on a single copy of the Hilbert space to states in the tensor product of two copies of the Hilbert space. Using this picture we argue that the corresponding states in the dual string theory living on AdS 2 × K are described by the twisted version of the Hartle–Hawking states, the twists being generated by a large unitary group of symmetries that this string theory must possess. This formalism makes natural the dual interpretation of the black hole entropy—as the logarithm of the degeneracy of ground states of the quantum mechanics describing the low energy dynamics of the black hole, and also as an entanglement entropy between the two copies of the same quantum theory living on the two boundaries of global AdS 2 separated by the event horizon.
Indian Association of Pediatric Surgeons-Presidential Address delivered at 36 th annual conference, New Delhi, October 2010
Basu Ashoke
Journal of Indian Association of Pediatric Surgeons , 2010,
Rotating Charged Black Hole Solution in Heterotic String Theory
Ashoke Sen
Physics , 1992, DOI: 10.1103/PhysRevLett.69.1006
Abstract: We construct a solution of the classical equations of motion arising in the low energy effective field theory for heterotic string theory. This solution describes a black hole in four dimensions carrying mass $M$, charge $Q$ and angular momentum $J$. The extremal limit of the solution is discussed.
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