Mathematics, Statistics & Physics: Recent submissions
Now showing items 481-500 of 738
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Enhancing the Sensing Performance of Zigzag Graphene Nanoribbon to Detect NO, NO, and NH Gases.
( MDPI , 2020 , Article)In this article, a zigzag graphene nanoribbon (ZGNR)-based sensor was built utilizing the Atomistic ToolKit Virtual NanoLab (ATK-VNL), and used to detect nitric oxide (NO), nitrogen dioxide (NO), and ammonia (NH). The ... -
Nanostructured Metal Oxide-Based Acetone Gas Sensors: A Review.
( MDPI , 2020 , Article Review)Acetone is a well-known volatile organic compound that is widely used in different industrial and domestic areas. However, it can have dangerous effects on human life and health. Thus, the realization of sensitive and ... -
CO, CO2, and SO2 detection based on functionalized graphene nanoribbons: First principles study
( Elsevier , 2020 , Article)In this study, density functional theory (DFT) has been used to build armchair graphene nanoribbon (AGNR) gas sensor and study its capacity to detect carbon monoxide (CO), carbon dioxide (CO2), and sulfur dioxide (SO2) ... -
Fabrication of H2S gas sensors using ZnxCu1-xFe2O4 nanoparticles
( Springer , 2020 , Article)Spinel ferrite nanoparticles can be easily retrieved and utilized for multiple cycles due to their magnetic properties. In this work, nanoparticles of a ZnxCu1-xFe2O4 composition were synthesized by employing a sol–gel ... -
Production of flexible nanocomposite membranes for x-ray detectors
( Elsevier , 2020 , Article)Flexible membranes of poly(vinyl alcohol) (PVA) polymer and CuO nanoparticles for x-ray detection applications are reported in this work. PVA represents a polymer matrix for nanoparticles, and its flexibility and electrical ... -
DFT investigation of H2S adsorption on graphenenanosheets and nanoribbons: Comparative study
( Elsevier , 2020 , Article)Graphenenanosheet (GNS), armchair graphenenanoribbon (AGNR), and zigzag graphenenanoribbon (ZGNR) systems were investigated by first principle calculations using the density functional theory (DFT). The DFT calculations ... -
First principle investigation of H2Se, H2Te and PH3 sensing based on graphene oxide
( Elsevier , 2020 , Article)Detecting toxic gases is of great importance to protect our health and preserve the quality of life. In this work, graphene (G) and graphene oxide with three different modifications (G–O, G–OH, and G–O–OH) have been used ... -
Pt-doped armchair graphene nanoribbon as a promising gas sensor for CO and CO2: DFT study
( Elsevier , 2021 , Article)In this work, four armchair graphene nanoribbon (AGNR) based sensor materials were built using Atomistic ToolKit Virtual NanoLab (ATK-VNL) and utilized to detect carbon monoxide (CO) and carbon dioxide (CO2) gases. First, ... -
Photocatalytic activity of transition metal ions-loaded activated carbon: Degradation of crystal violet dye under solar radiation
( Elsevier Ltd , 2017 , Article)In this work, activated carbon (AC) was prepared from date palm stone by chemical activation method. Its properties were investigated, the surface of the AC was found to be acidic (pHpzc of 3.95), Brunauer-Emmet-Teller ... -
Erratum to: Two-stage complete allocation sampling (Environmetrics, (2017), 28, 3, (e2441), 10.1002/env.2441)
( John Wiley and Sons Ltd , 2017 , Other)This article corrects: Salehi MM, Seber GAF. Two-stage complete allocation sampling. Environmetrics. 2017;28:e2441. https://doi.org/10.1002/env.2441. The main correction is on the introduced unbiased estimator of the ... -
On Model Selection for Autocorrelated Processes in Statistical Process Control
( John Wiley and Sons Ltd , 2017 , Article)Using traditional control charts to monitor autocorrelated processes is not beneficial, because it will lead us to misleading detections in the processes. One of the methods used to deal with the control charts for ... -
Fast and Accurate Computation of the Logarithmic Capacity of Compact Sets
( Springer Berlin Heidelberg , 2017 , Article)We present a numerical method for computing the logarithmic capacity of compact subsets of C, which are bounded by Jordan curves and have finitely connected complement. The subsets may have several components and need not ... -
Optimization design of the CUSUM and EWMA charts for autocorrelated processes
( John Wiley and Sons Ltd , 2017 , Article)The traditional control charts produce frequent false alarm signals in the presence of autocorrelation. The implementation of the modified chart scheme is a way of handling the problem of autocorrelation in control charts. ... -
Poisson progressive mean control chart
( John Wiley and Sons Ltd , 2017 , Article)In real life applications, many process-monitoring problems in statistical process control are based on attribute data resulting from quality characteristics that cannot be measured on numerical or quantitative scales. For ... -
Chimera state in a two-dimensional network of coupled genetic oscillators
( Institute of Physics Publishing , 2019 , Article)Due to the interaction of the cells, cellular communications are carried out with emergent collective behaviors, such as synchronization. In this paper, a network of coupled genetic oscillators is studied by considering a ... -
An enhanced nonparametric EWMA sign control chart using sequential mechanism
( Public Library of Science , 2019 , Article)Control charts play a significant role to monitor the performance of a process. Nonparametric control charts are helpful when the probability model of the process output is not known. In such cases, the sampling mechanism ... -
Endpoint Estimates for Oscillatory Singular Integrals with H�lder Class Kernels
( Hindawi Limited , 2019 , Article)We prove the uniform L1?L1,? and HE 1?L1 boundedness of oscillatory singular integral operators whose kernels are the products of an oscillatory factor with bilinear phase and a Calder�n-Zygmund kernel K(x,y) satisfying a ... -
Efficient cv control charts based on ranked set sampling
( Institute of Electrical and Electronics Engineers Inc. , 2019 , Article)Monitoring process variability is essential for establishing efficient process-control schemes. In practice, when the mean levels of a parameter are constant, and the process variance (or standard deviation) is independent ... -
On improved dispersion control charts under ranked set schemes for normal and non-normal processes
( John Wiley and Sons Ltd , 2019 , Article)In manufacturing industries, control charts are the promising statistical tools used for an efficient monitoring of processes. These charts enhance the product quality by timely signaling for special variations at any stage ... -
Edge maximal non-bipartite Hamiltonian graphs without theta graphs of order 7
( Forum-Editrice Universitaria Udinese SRL , 2019 , Article)For a set of graphs F, let H(n; F) denote the class of non-bipartite Hamiltonian graphs on n vertices that does not contain any graph of F as a subgraph and h(n; F) = max{E(G): G ? H(n; F)} where E(G) is the number of edges ...
