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31.
The use of tetravalent ceric ions to initiate graft-copolymerization of methyl methacrylate onto natural rubber (NR) has been investigated. The rate of grafting has been determined by varying the concentration of monomer and cerium(IV), the temperature and the solvents. The graft yield increases with increasing monomer concentration up to 1.877 M, with further increase of the monomer, the graft yield decreases. The percentage of grafting increases with increasing cerium(IV) concentration up to 0.035 M, thereafter it decreases. With increasing temperature the graft yield increases. The effect of CuSO4 on the rate of grafting has also been investigated. A plausible mechanism has been suggested and the kinetic rate expressions have been derived. 相似文献
32.
Roy Satyabrata Shrivastava Manu Pandey Chirag Vinodkumar Nayak Sanjeet Kumar Rawat Umashankar 《Multimedia Tools and Applications》2021,80(21-23):31529-31567
Multimedia Tools and Applications - Present era is marked by exponential growth in transfer of multimedia data through internet. Most of the Internet-of-Things(IoT) applications send images to... 相似文献
33.
Nayak Janmenjoy Meher Saroj K. Souri Alireza Naik Bighnaraj Vimal S. 《The Journal of supercomputing》2022,78(13):14866-14891
The Journal of Supercomputing - The Internet of Medical Things (IoMT) is a bionetwork of allied medical devices, sensors, wearable biosensor devices, etc. It is gradually reforming the healthcare... 相似文献
34.
Sujit Majumdar Suraj Kumar Debasish Roy Samik Chakraborty Santanu Das 《Materials and Manufacturing Processes》2018,33(13):1459-1465
The presence of air boundary layer around a grinding wheel impedes the proper entry of cutting fluid into grinding zone and thereby lubrication and cooling are hampered. It leads to the thermal damage to the workpiece and rapid wheel wear. This experimental work is aimed at increasing the lubrication and cooling effects in grinding by a novel method of using scraper board. The experiments are conducted, using the scraper board, to find the critical region where the air pressure is zero. The coolant jet has then impinged into the grinding zone which is maintained within the critical region. The requirement of specific energy, surface texture, and mechanical properties of the ground surface are analyzed and compared with the traditional grinding and the grinding at various positions of scraper board. Results show that the grinding ratio improved by 35.6and 119%, surface roughness decreased by 36 and 54.2%, while the requirement of specific energy is reduced by 50.8 and 57.3% when scraper board is positioned at the critical distance in comparison to the 57.5° position and no scraper board, respectively. The results indicate that the introduction of fluid in the present method can improve the process efficiency and the product quality effectively. 相似文献
35.
36.
Rhee T Lewis JP Neumann U Nayak KS 《IEEE transactions on visualization and computer graphics》2011,17(3):368-379
This paper describes a complete system to create anatomically accurate example-based volume deformation and animation of articulated body regions, starting from multiple in vivo volume scans of a specific individual. In order to solve the correspondence problem across volume scans, a template volume is registered to each sample. The wide range of pose variations is first approximated by volume blend deformation (VBD), providing proper initialization of the articulated subject in different poses. A novel registration method is presented to efficiently reduce the computation cost while avoiding strong local minima inherent in complex articulated body volume registration. The algorithm highly constrains the degrees of freedom and search space involved in the nonlinear optimization, using hierarchical volume structures and locally constrained deformation based on the biharmonic clamped spline. Our registration step establishes a correspondence across scans, allowing a data-driven deformation approach in the volume domain. The results provide an occlusion-free person-specific 3D human body model, asymptotically accurate inner tissue deformations, and realistic volume animation of articulated movements driven by standard joint control estimated from the actual skeleton. Our approach also addresses the practical issues arising in using scans from living subjects. The robustness of our algorithms is tested by their applications on the hand, probably the most complex articulated region in the body, and the knee, a frequent subject area for medical imaging due to injuries. 相似文献
37.
Pradipta K. Nayak Jongsu Jang Changhee Lee Yongtaek Hong 《Journal of the Society for Information Display》2010,18(8):552-557
Abstract— The effects of lithium (Li) doping concentration and gate dielectrics on the performance of solution‐processed zinc‐oxide (ZnO) thin‐film transistors (TFTs) has been investigated. ZnO films with strong c‐axis orientation and lower background conductivity was obtained with 15 at.% of Li. Different crystallization behavior of ZnO was observed in the case of various dielectric surfaces. The 15‐at.% Li‐doped ZnO films (thickness ~20 nm) prepared on SiO2 and SiNx were found to be present in crystalline form, whereas the film prepared on aluminum titanium oxide (ATO) was found to be amorphous. A field‐effect mobility of 1.81 cm2/V‐sec and an Ion/Ioff ratio of 2 × 106 were obtained for the 15‐at.% Li‐doped ZnO TFTs with a bilayer gate dielectric of SiO2 and SiNx. The comparison of dielectric studies showed that the performance of TFTs prepared on SiNx and ATO are higher than that of the TFTs prepared on SiO2. 相似文献
38.
Laxman U. S. Nayak Lee Priest Allan P. White 《Universal Access in the Information Society》2010,9(4):367-374
In this cross-sectional study, the principles of a technology acceptance model were used to identify variables related to
the level of Internet usage by older adults. Community-dwelling older adults aged 60–88 years completed a postal questionnaire
survey that elicited responses on the use of the Internet. Out of a sample of 592 older adults (236 males and 356 females),
50.7% used the Internet. A multiple linear regression analysis was carried out on the Internet users sample using the self-reported
number of hours of Internet usage per week as the dependent variable. The results indicated that attitude toward using the
Internet and good health status were statistically significant predictors of the level of Internet usage. A second multiple
regression analysis using Internet activity as the dependent variable showed that attitude, usefulness, good health, and gender
(males) were significant predictor variables. 相似文献
39.
Soumya Priyadarsini Panda Ajit Kumar Nayak 《International Journal of Speech Technology》2017,20(4):959-976
Designing text-to-speech systems capable of producing natural sounding speech segments in different Indian languages is a challenging and ongoing problem. Due to the large number of possible pronunciations in different Indian languages, a number of speech segments are needed to be stored in the speech database while a concatenative speech synthesis technique is used to achieve highly natural speech segments. However, the large speech database size makes it unusable for small hand held devices or human computer interactive systems with limited storage resources. In this paper, we proposed a fraction-based waveform concatenation technique to produce intelligible speech segments from a small footprint speech database. The results of all the experiments performed shows the effectiveness of the proposed technique in producing intelligible speech segments in different Indian languages even with very less storage and computation overhead compared to the existing syllable-based technique. 相似文献
40.
We consider the problem of testing the commutativity of a black-box group specified by its k generators. The complexity (in
terms of k) of this problem was first considered by Pak, who gave a randomized algorithm involving O(k) group operations.
We construct a quite optimal quantum algorithm for this problem whose complexity is in
. The algorithm uses and highlights the power of the quantization method of
Szegedy. For the lower bound of
, we give a reduction from a special case of Element Distinctness to our problem. Along the way, we prove the optimality of
the algorithm of Pak for the randomized model. 相似文献