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Effect of roughness on interface shear behavior of sand with steel and concrete surface
Samanta, Manojit,Punetha, Piyush,Sharma, Mahesh Techno-Press 2018 Geomechanics & engineering Vol.14 No.4
The present study evaluates the interface shear strength between sand and different construction materials, namely steel and concrete, using direct shear test apparatus. The influence of surface roughness, mean size of sand particles, relative density of sand and size of the direct shear box on the interface shear behavior of sand with steel and concrete has been investigated. Test results show that the surface roughness of the construction materials significantly influences the interface shear strength. The peak and residual interface friction angles increase rapidly up to a particular value of surface roughness (critical surface roughness), beyond which the effect becomes negligible. At critical surface roughness, the peak and residual friction angles of the interfaces are 85-92% of the peak and residual internal friction angles of the sand. The particle size of sand (for morphologically identical sands) significantly influences the value of critical surface roughness. For the different roughness considered in the present study, both the peak and residual interaction coefficients lie in the range of 0.3-1. Moreover, the peak and residual interaction coefficients for all the interfaces considered are nearly identical, irrespective of the size of the direct shear box. The constitutive modeling of different interfaces followed the experimental investigation and it successfully predicted the pre-peak, peak and post peak interface shear response with reasonable accuracy. Moreover, the predicted stress-displacement relationship of different interfaces is in good agreement with the experimental results. The findings of the present study may also be applicable to other non-yielding interfaces having a similar range of roughness and sand properties.
An Optimize Approach to Design MUX Based Decoder Using Source Coupled Logic
Pooja Verma,Deepak Punetha,Yogita Bahuguna 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.5
In Combination logic there are some patterns which commonly occur and it is convenient to represent these in their own separate units often they are also available as separate integrated circuits. This research paper covers the two of these, the decoder and the multiplexer. In this work, designing of 2:1 MUX and MUX Based Decoder using SCL (Source Coupled Logic) is done. Power and value of current spike (Rail–to-Rail current) is found for the circuits. The Simulation is done using 180nm technology using TANNER (Version 9.2) tool.
Preserving the Edges of a Digital Image Using Various Filtering Algorithms and Tools
Kumar Navjeet,Deepak Punetha,Frederick Ehiagwina 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.12
Digital Image Processing is basically the implementation of a set of computer algorithms for processing digital images. Digital image processing has probative advantages over Analog image processing. In this content, noise like, Gaussian, Salt and Pepper, Speckle and Poisson, is added to an image and then the original edges are restored using various filters and tools. These tools have remarkable alteration on the image and hence they are widely employed. Some of them are wavelet transform, median filter, Weiner filter and many more.
Ashima Malhotra,Vikas Gupta,Mary Abraham,Pankaj Punetha,Yashpal Bundela 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.2
Study Design: Prospective, randomised controlled, single centre study of 45 patients posted for two level lumbar fixation surgery in the prone position. Purpose: To compare intra-abdominal pressure (IAP), mean airway pressure mean airway pressure and blood loss during the spine surgery in prone position using three different positioning systems. Overview of Literature: Studies have correlated IAP with the amount of perioperative bleeding. However, IAP and airway pressures while assessing the bleeding comparing two or more prone positioning systems are unclear. Methods: This prospective study was conducted on a cohort of 45 patients scheduled for two-level lumbar fixation. Patients were randomly allocated to a spine table, Wilson’s frame, and thermomodulated pads. Bladder pressure as an indicator of IAP, mean and peak airway pressures, and blood loss were monitored. Results: IAP increased whenever patient position was changed to prone .The increase in pressure was more in the Wilson’s frame group but was statistically significant only on prolonged positioning. Adopting the prone position always increased the mean airway pressure, but the increased was significant only in the Wilson’s frame group. Mean airway pressure decreased in the spine table group and was statistically significant. The blood loss in the spine table group was significantly less as compared to the other groups. Conclusions: Positioning on a spine table results in less blood loss and low mean airway pressure. The Wilson’s frame results in high IAP, increased mean airway pressure, and more blood loss. The thermomodulated frame increases mean airway pressure and produces a moderate increase in IAP and airway pressure.