A GPU-based hyperbolic SVD algorithm

A one-sided Jacobi hyperbolic singular value decomposition (HSVD) algorithm, using a massively parallel graphics processing unit (GPU), is developed. The algorithm also serves as the final stage of solving a symmetric indefinite eigenvalue problem. Numerical testing demonstrates the gains in speed and accuracy over sequential and MPI-parallelized variants of similar Jacobi-type HSVD algorithms. Finally, possibilities of hybrid CPU--GPU parallelism are discussed.Comment: Accepted for publication in BIT Numerical Mathematic

Expansion algorithm for the density matrix

A purification algorithm for expanding the single-particle density matrix in terms of the Hamiltonian operator is proposed. The scheme works with a predefined occupation and requires less than half the number of matrix-matrix multiplications compared to existing methods at low (90%) occupancy. The expansion can be used with a fixed chemical potential in which case it is an asymmetric generalization of and a substantial improvement over grand canonical McWeeny purification. It is shown that the computational complexity, measured as number of matrix multiplications, essentially is independent of system size even for metallic materials with a vanishing band gap.Comment: 5 pages, 4 figures, to appear in Phys. Rev.

Factors Influencing the Adoption of Self Service Technologies (SSTs) : A study of attitudes towards SSTs (Internet Banking, Online Shopping and Self-Check-In Machine at the Airports) and the influence of new technologies (smart phones and tablet computers).

Developments in information technology and tangible computing facilitate the human’s life by inventing Self Service Technologies SSTs where it changed the way we interact with the environment as well as new technologies did. Nowadays, a lot of new technologies have embodied computer inside such as smartphone and computer tablets. Previous studies in adoption of SSTs research treat customer behavior towards technology based services. However, recent studies recognize that participants have different attitude towards different technologies even if these technologies used to support the same service. Therefore, in our thesis we are going to study the effect of smartphone i.e. iPhone and computer tablets i.e. iPad on adoption of three services of SSTs Internet Banking, Online Shopping and Self Check In Machine at Airports. Is there any hesitation while people adopting with this technology? If yes, why does it happen? Our data were collected by conducting a pilot and empirical study via using quantitative and qualitative approaches. We conducted our study at Umeå, Sweden. The study findings present the effect of adoption through age, family, friends, money, knowledge, using technology in public and private places, mobile technology and computer tablets, and Interface design on adoption SSTs. We found that participants were influenced by new technology for adopting SSTs. Participants did not use Online Shopping as much as they use Internet Banking, especially in the private places. Concerning the Self Check in Machines, participants were differential in which some tend to use it and others did not

Molecular Characterization of the Newcastle Disease Virus Currently Circulating Among Broiler Chicken Flocks During 2021 in Sharkia Province, Egypt

        Newcastle disease (ND) outbreaks have been occurred in the Egyptian poultry causing high mortalities with severe economic losses. NDV infection of genotype VII has been reported to cause outbreaks in several commercial poultry farms in Egypt. In the present study, NDV was isolated from 6 broiler chicken flocks in Sharkia province suffering from respiratory and/or neurological signs into the allantoic sac of 11-day-old commercial embryonated chicken eggs (ECEs) as well as these isolates were subjected to reverse transcriptase - polymerase chain reaction (RT-PCR). Six isolates (one NDV isolate/each flock) were sequenced to characterize their whole fusion (F) protein gene of NDV. The sequence analysis and phylogenetic study of the six isolates revealed that they were velogenic, belonging to the class II subgenotype NDV VIId with the characteristic amino acid sequences of the F0 protein proteolytic cleavage site motifs (112-RRQKRF-117). As well as the nucleotide blast analysis showed 97.4% - 98.6% nucleotide identity to virulent NDV isolated in Egypt and neighboring countries. On the other hand, the nucleotide blast analysis showed 82.3% - 83% nucleotide identity to reference commercially available vaccine strains. This genetic variation between the commercially available vaccine strains and six studied NDV strains during 2021 may clarify the failure of the currently used vaccines to protect chicken against vNDV subgenotype VIId. Further studies are needed to monitor the protection of the currently used vaccines against recently isolated vNDV strains