### 2876206 results

Contributors: F.M. Siam, M. Grinfeld, A. Bahar, H.A. Rahman, H. Ahmad, F. Johar

Date: 2018-09-01

... The main goal of our study is to develop a realistic mechanistic model of the effect of ionizing radiation on DNA in mammalian cells. We consider a population of cells structured by the number of DNA double strand breaks due to radiation. Using the system of linear differential equation, the model describes the evolution of the irradiated population of cells in time. The work is in three parts. First, we consider the effect of a single dose of radiation, while in the second part we work on the model parameter estimation using Nelder–Mead simplex algorithm which allows us to relate the clinically useful parameters of the LQ relation to aspects of cellular activity that can be manipulated experimentally. In the third part, we deal with cell killing effects of fractioned doses of radiation. Using MATLAB, we observed the cell survival fractions can be well approximated by the Linear–Quadratic relation and also show fewer cell will die if the dose is fractionated in two or more fractions.

Files:

Contributors: Yuan Guan, Shaomang Wang, Xin Wang, Cheng Sun, Yongbo Wang, Lingjie Hu

Date: 2018-07-15

... A promising mesoporous SiAl material, Al-MCM-41 was successfully prepared by alkali calcination leaching of natural palygorskite, and sequent hydrothermal synthesis coupled with calcination. The morphology, structure, surface area and pore-size distribution of the material were characterized by scanning electron microscopy, small-angle X-ray diffraction and N2 adsorption–desorption isotherms. The Al-MCM-41 possessed better crystallinity and larger specific surface area with CTAB/SiO2 mass ratio of 0.1:1, pH of 5, crystallization temperature of 110 °C, crystallization time of 12 h and calcination of 550 °C for 5 h. The Al-MCM-41 was used as an adsorbent for the removal of hazardous aniline dye-basic fuchsin from water. Adsorption kinetics and isotherms analysis indicated that adsorption of basic fuchsin onto Al-MCM-41 followed pseudo-first-order model and Langmuir adsorption isotherm. In addition, intra-particle diffusion was rate determining step of the adsorption process. The results demonstrated that the as-synthesized Al-MCM-41 had potential applications in the treatment of waste water.

Files:

Contributors: Beatriz Fernández-Muñiz, José Manuel Montes-Peón, Camilo José Vázquez-Ordás

Date: 2018-07-01

... The sensitivity of occupational accidents to the economic cycle can shed light on the effectiveness of occupational health and safety policies. This work analyses the effect of the economic cycle on occupational accidents in Spain in the period 1994–2014. We first perform a regression analysis to evaluate the relation between GDP growth and incidence rate, comparing Spain and Germany. Statistics on GDP growth (OECD) and standardised incidence rates (from Eurostat) are used. Then, from a sectorial perspective, we perform a variance decomposition analysis to measure the effect of the increase in the incidence rates on the growth in the number of accidents in Spain between 2013 and 2014. We use data disaggregated by sector from national databases on occupational accidents to this end.

Files:

Contributors: S. Heide, P. Chariot, P. Green, J. Fabian, J.J. Payne-James

Date: 2018-07-01

... Death and harm is well-recognised in detainees in police custody worldwide. Based on the results of previous global surveys and the CPT (European Committee for the Prevention of Torture) recommendations a questionnaire was developed to summarise the current medical aspects of police custody in European countries. The survey was distributed to named contacts in all European countries. Data from 25 European countries was obtained.

Files:

Contributors: Charlie Brooker, Karen Tocque, Damian Mitchell, Malcolm Pearce

Date: 2018-07-01

... To report on a health needs assessment undertaken in the Durham Constabulary (England) in 2013.

Files:

Contributors: V. Shabunko, C.M. Lim, S. Mathew

Date: 2018-06-15

... Energy performance of buildings is a highly important measure for Energy Efficiency and Conservation initiatives. The fundamental step toward the understanding of energy use is benchmarking. In this study, the EnergyPlus simulation tool is used to benchmark the energy performance of 400 residential buildings from which three types of buildings were classified. EnergyPlus models were developed for the three types of building designs typically found in the national housing scheme in Brunei Darussalam. The EnergyPlus models produced the energy use intensity (EUI) per year for these buildings, with values ranging from approximately 64.2 to 47.8kWh/m2. The EnergyPlus outputs were verified against the power consumption data, and data from selected door-to-door survey. This study demonstrates the capability of engineering models in producing benchmarking, and simulating conditions for the improvements of energy performance in buildings.

Files:

Contributors: Sergey Bereg, Binay Bhattacharya, Sandip Das, Tsunehiko Kameda, Priya Ranjan Sinha Mahapatra, Zhao Song

Date: 2018-06-12

... We investigate three kinds of optimization problems regarding n points in the 2-dimensional plane that need to be enclosed by squares. (1) Find a given number of squares that enclose all the points, minimizing the size of the largest square used. (2) Problem (1) with the additional condition that the center of each enclosing square must lie on one of the two given axis-parallel lines, which are either parallel or perpendicular. (3) Enclose the maximum number of points, using a specified number of squares of a fixed size.

Files:

### Electrical Engineering - Universal shift register implementation using quantum dot cellular automata

Contributors: Tamoghna Purkayastha, Debashis De, Tanay Chattopadhyay

Date: 2018-06-01

... Quantum-dot Cellular Automata (QCA) demands to be a promising alternative of CMOS in ultra large scale circuit integration. Arithmetic and logic unit designs using QCA are of high research interest. A layout of four and eight bit universal shift register (USR) has been proposed. Initially QCA layouts of D flip-flop with clear and 4 to 1 multiplexer are designed, which are extended to design 4 and 8-bit parallel in parallel out (PIPO) shift register. Finally the PIPO is utilized to design 4-bit and 8-bit USR. By the comparative analysis it is observed that the proposed D Flip-flop achieved 40% clock delay improvement, whereas the modified layout of 4 to 1 multiplexer achieved 30% cell count reduction and 17% clock delay reduction from the previous works. This results in 31% reduction in cell count, 45% reduction in area and 55% reduction in clock cycle delay in 8 bit USR layout.

Files:

Contributors: Apoorva Aggarwal, T.K. Rawat, Manjeet Kumar, D.K. Upadhyay

Date: 2018-06-01

... In this paper, an optimal design of linear phase digital finite impulse response (FIR) band stop (BS) filter using the L1-norm based real-coded genetic algorithm (L1-RCGA) is presented. Although RCGA has proved its ability to overcome the drawbacks associated with conventional gradient-based optimization methods of filter design, it is applied here with a novel fitness function based on the L1-norm. This leads to a global optimal solution along with the improvement in filter design with same specifications. The designed filter pursues a better response in terms of flat passband, high stopband attenuation and fast convergence. The simulation results justify that the proposed FIR BS filter using L1-RCGA outperforms the existing optimization techniques, the L1-method and particle swarm optimization (PSO) and the conventional methods such as least-squares (LS) approach, Kaiser window method and the Parks McClellan (PM) algorithm. A detailed analysis is performed to evaluate the performance of the designed filters.

Files:

Contributors: Héctor Migallón, Violeta Migallón, Juan A. Palomino, José Penadés

Date: 2018-06-01

... The PageRank algorithm for determining the importance of Web pages has become a central technique in Web search. This algorithm uses the Power method to compute successive iterates that converge to the principal eigenvector of the Markov chain representing the Web link graph. In this work we present an effective heuristic Relaxed and Extrapolated algorithm based on the Power method that accelerates its convergence. A hybrid parallel implementation of this algorithm has been designed by combining various OpenMP threads for each MPI process and several strategies of data distribution among nodes have been analyzed. The results show that the proposed algorithm can significantly speed up the convergence time with respect to the parallel Power algorithm.

Files: