| 1. |
- Dogar, Attiq Ur Rahman, et al.
(författare)
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Experimental investigations on inelastic behaviour and modified Gerber joint for double-span steel trapezoidal sheeting
- 2020
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Ingår i: Structures. - : Elsevier. - 2352-0124. ; 24, s. 514-525
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Tidskriftsartikel (refereegranskat)abstract
- Cold-formed steel trapezoidal profiles provide efficient solutions for roofing and often use the Gerber joint to effectively utilize capacities. The previous design of Gerber joint was sensitive to uneven distribution of loads and accidental loads, which imposed bending moments in the joint and lead to its failure. In this experimental program, the design of Gerber joint has been modified to work as a hinge under service loads and carry moments in accidental conditions. Also, the design of CFS is based on elastic methods that underestimate their capacity, especially for multi-span systems. Full-scale tests were conducted on highly stiffened double-span trapezoidal sheeting profiles with modified Gerber joint to investigate elastic capacity, inelastic behaviour, moment redistribution in the post-elastic phase, ultimate load capacity and feasibility of modified Gerber joint. Comparison of elastic load capacity with EWM and DSM predictions revealed that EWM design predictions were conservative by 30% while DSM predictions were accurate. For multi-span application, residual moment capacity ratios of 0.76 and 0.81 in the post-elastic phase allowed for moment redistribution and increased ultimate load capacity by 7.14% and 8.80% for 0.85 mm and 1 mm thick profiles respectively. Performance of modified Gerber joint to behave as a hinge under service loads and as continuous in the post-elastic phase was also found to be satisfactory. The study concluded that the economy in design and capacity utilization of multi-span CFS profiles can be improved by allowing for moment redistribution and using the modified Gerber joint.
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| 2. |
- Abelev, Betty, et al.
(författare)
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Long-range angular correlations on the near and away side in p-Pb collisions at root S-NN=5.02 TeV
- 2013
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Ingår i: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier BV. - 0370-2693. ; 719:1-3, s. 29-41
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Tidskriftsartikel (refereegranskat)abstract
- Angular correlations between charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV for transverse momentum ranges within 0.5 < P-T,P-assoc < P-T,P-trig < 4 GeV/c. The correlations are measured over two units of pseudorapidity and full azimuthal angle in different intervals of event multiplicity, and expressed as associated yield per trigger particle. Two long-range ridge-like structures, one on the near side and one on the away side, are observed when the per-trigger yield obtained in low-multiplicity events is subtracted from the one in high-multiplicity events. The excess on the near-side is qualitatively similar to that recently reported by the CMS Collaboration, while the excess on the away-side is reported for the first time. The two-ridge structure projected onto azimuthal angle is quantified with the second and third Fourier coefficients as well as by near-side and away-side yields and widths. The yields on the near side and on the away side are equal within the uncertainties for all studied event multiplicity and p(T) bins, and the widths show no significant evolution with event multiplicity or p(T). These findings suggest that the near-side ridge is accompanied by an essentially identical away-side ridge. (c) 2013 CERN. Published by Elsevier B.V. All rights reserved.
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| 3. |
- Jahaya, Bakkurudeen Ali, et al.
(författare)
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Hardware Implementation of JPEG2000 Encoder for Video Compression
- 2007
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Ingår i: ICIAS 2007. - NEW YORK : IEEE. - 9781424413553 ; , s. 1296-1299
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Konferensbidrag (refereegranskat)abstract
- JPEG2000 is an upcoming compression standard for still images that has a feature set well tuned for the present wireless and internet age. These features are possible due to adaptation of discrete wavelet transform, fractional bit plane coding and arithmetic coding. All the three algorithms are computationally intensive and require substantial number of memory and arithmetic operations. In this paper we propose a system level architecture capable of encoding JPEG2000 algorithm. For Discrete Wavelet Transform (DWT), a lifting based DWT core for lossy compression is proposed which reduces the hardware cost and achieves the higher hardware utilization. For Embedded Block Coding with Optimized Truncation (EBCOT), column-based coding architecture of Tier-1 block coding engine is discussed. The system architecture has been implemented using VHDL and synthesized for Xilinx Virtex-II FPGA with estimated frequency of 50 MHz.
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