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Journal articles on the topic 'Hybrid sigma model'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Eckermann, Stephen D., John P. McCormack, Jun Ma, Timothy F. Hogan, and Katherine A. Zawdie. "Stratospheric Analysis and Forecast Errors Using Hybrid and Sigma Coordinates." Monthly Weather Review 142, no. 1 (2014): 476–85. http://dx.doi.org/10.1175/mwr-d-13-00203.1.

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Abstract Past investigations have documented large divergent wind anomalies in stratospheric reanalyses over steep terrain, which were attributed to discretization errors produced by the terrain-following (sigma) vertical coordinate in the forecast model. However, forecasting experiments have reported negligible differences in skill between sigma- and hybrid-coordinate models. This leads to the paradoxical conclusion that discretization errors in the forecast model yield significant stratospheric analysis errors, but insignificant stratospheric forecast errors. The authors reexamine this issue

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Akbar, N., and S. Noor. "Potential Model for \({\mit \Sigma }_{u}^{-}\) Hybrid Meson State." Acta Physica Polonica B 52, no. 9 (2021): 1105. http://dx.doi.org/10.5506/aphyspolb.52.1105.

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Takátsy, János, Péter Kovács, and György Wolf. "Hybrid star properties from an extended linear sigma model." Astronomische Nachrichten 342, no. 1-2 (2021): 271–76. http://dx.doi.org/10.1002/asna.202113918.

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Wang, Fu-Kwun, Chen-Hsoung Hsu, and Gwo-Hshiung Tzeng. "Applying a Hybrid MCDM Model for Six Sigma Project Selection." Mathematical Problems in Engineering 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/730934.

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Six Sigma is a project-driven methodology; the projects that provide the maximum financial benefits and other impacts to the organization must be prioritized. Project selection (PS) is a type of multiple criteria decision making (MCDM) problem. In this study, we present a hybrid MCDM model combining the decision-making trial and evaluation laboratory (DEMATEL) technique, analytic network process (ANP), and the VIKOR method to evaluate and improve Six Sigma projects for reducing performance gaps in each criterion and dimension. We consider the film printing industry of Taiwan as an empirical ca

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Kovács, P., and J. Takátsy. "Hybrid Star Construction with the Extended Linear Sigma Model: Preliminary Results." Acta Physica Polonica B Proceedings Supplement 14, no. 1 (2021): 127. http://dx.doi.org/10.5506/aphyspolbsupp.14.127.

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PAN, Yu-min, Li-yong ZHAO, and Quan-zhu ZHANG. "Gas emission prediction model of hybrid pi-sigma fuzzy neural network." Journal of Computer Applications 32, no. 4 (2013): 1045–49. http://dx.doi.org/10.3724/sp.j.1087.2012.01045.

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Juang, Hann-Ming Henry. "A Multiconserving Discretization with Enthalpy as a Thermodynamic Prognostic Variable in Generalized Hybrid Vertical Coordinates for the NCEP Global Forecast System." Monthly Weather Review 139, no. 5 (2011): 1583–607. http://dx.doi.org/10.1175/2010mwr3295.1.

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A new vertical discretization used in the atmospheric dynamics of the National Centers for Environmental Prediction (NCEP) Global Forecast System (GFS) is illustrated, with enthalpy as the thermodynamic prognostic variable to reduce computation in thermodynamic equations while concerning all gas tracers in the model. Mass, energy, entropy, and angular momentum conservations are utilized as constraints to discretize the vertical integration with a finite-difference scheme. A specific definition of a generalized hybrid vertical coordinate, including sigma, isobaric, and isentropic surfaces, is i

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Beck, Jeffrey, John Brown, Jimy Dudhia, et al. "An Evaluation of a Hybrid, Terrain-Following Vertical Coordinate in the WRF-Based RAP and HRRR Models." Weather and Forecasting 35, no. 3 (2020): 1081–96. http://dx.doi.org/10.1175/waf-d-19-0146.1.

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Abstract A new hybrid, sigma-pressure vertical coordinate was recently added to the Weather Research and Forecasting (WRF) Model in an effort to reduce numerical noise in the model equations near complex terrain. Testing of this hybrid, terrain-following coordinate was undertaken in the WRF-based Rapid Refresh (RAP) and High-Resolution Rapid Refresh (HRRR) models to assess impacts on retrospective and real-time simulations. Initial cold-start simulations indicated that the majority of differences between the hybrid and traditional sigma coordinate were confined to regions downstream of mountai

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JENA, P. K., and L. P. SINGH. "PHASE TRANSITION AND HYBRID STAR IN AN SU(2) CHIRAL SIGMA MODEL." Modern Physics Letters A 17, no. 40 (2002): 2633–46. http://dx.doi.org/10.1142/s0217732302009295.

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We use a modified SU(2) chiral sigma model to study nuclear matter at high density using mean field approach. We also study the phase transition of nuclear matter to quark matter in the interior of highly dense neutron stars. Stable solutions of Tolman–Oppenheimer–Volkoff equations representing hybrid stars are obtained with a maximum mass of 1.69M⊙, radii around 9.3 km and a quark matter core constituting nearly 55–85% of the star radii.

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Jena, P. K., and L. P. Singh. "SU(2) Chiral Sigma Model Study of Phase Transition in Hybrid Stars." Modern Physics Letters A 18, no. 30 (2003): 2135–45. http://dx.doi.org/10.1142/s0217732303011976.

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We use a modified SU(2) chiral sigma model to study nuclear matter component and simple bag model for quark matter constituting a neutron star. We also study the phase transition of nuclear matter to quark matter with the mixed phase characterized by two conserved charges in the interior of highly dense neutron stars. Stable solutions of Tolman–Oppenheimer–Volkoff equations representing hybrid stars are obtained with a maximum mass of 1.67M⊙ and radius around 8.9 km.

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Toy, Michael D. "Incorporating Condensational Heating into a Nonhydrostatic Atmospheric Model Based on a Hybrid Isentropic–Sigma Vertical Coordinate." Monthly Weather Review 139, no. 9 (2011): 2940–54. http://dx.doi.org/10.1175/mwr-d-10-05015.1.

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Using isentropic coordinates in atmospheric models has the advantage of eliminating the cross-coordinate vertical mass flux for adiabatic flow, and virtually eliminating the associated numerical error in the vertical transport. This is a significant benefit since much of the flow in the atmosphere is approximately adiabatic. Nonadiabatic processes, such as condensational heating, result in a nonzero vertical velocity [Formula: see text] in isentropic coordinates. A method for incorporating condensational heating into a nonhydrostatic atmospheric model based on a hybrid isentropic–sigma vertica

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12

Park, Sang-Hun, Joseph B. Klemp, and Jung-Hoon Kim. "Hybrid Mass Coordinate in WRF-ARW and Its Impact on Upper-Level Turbulence Forecasting." Monthly Weather Review 147, no. 3 (2019): 971–85. http://dx.doi.org/10.1175/mwr-d-18-0334.1.

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Abstract Although a terrain-following vertical coordinate is well suited for the application of surface boundary conditions, it is well known that the influences of the terrain on the coordinate surfaces can contribute to increase numerical errors, particularly over steep topography. To reduce these errors, a hybrid sigma–pressure coordinate is formulated in the Weather Research and Forecasting (WRF) Model, and its effects are illustrated for both an idealized test case and a real-data forecast for upper-level turbulence. The idealized test case confirms that with the basic sigma coordinate, s

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Sarpiri, Mona Najafi, and Taghi Javdani Gandomani. "A case study of using the hybrid model of scrum and six sigma in software development." International Journal of Electrical and Computer Engineering (IJECE) 11, no. 6 (2021): 5342. http://dx.doi.org/10.11591/ijece.v11i6.pp5342-5350.

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<span>The world of software engineering is constantly discovering new ways that lead to an increase in team performance in the production of software products and, at the same time, brings the customer's further satisfaction. With the advent of agile methodologies in software development, these objectives have been considered more seriously by software teams and companies. Due to their very nature, agile methodologies have the potential to be integrated with other methodologies or specific managerial approaches defined in line with agility objectives. One of the cases is Six Sigma, which

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Ahmed, Ali, John Page, and John Olsen. "A comparison of three simulation methodologies for a Lean Six Sigma manufacturing project – a business case study." International Journal of Lean Six Sigma 11, no. 3 (2019): 405–27. http://dx.doi.org/10.1108/ijlss-03-2018-0025.

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Purpose This paper aims to compare the prognostic and visualisation capabilities of all the three simulation paradigms to identify their suitability and rigor in eliminating weaknesses and bottlenecks in a Lean Six Sigma (LSS) project. Design/methodology/approach The paper uses an light-emitting diode (LED) factory as a business case to show the differences and advantages of using three different simulation techniques to solve a manufacturing problem. Findings Even though this is only one business case that shows how system dynamics (SD) can be effective in a Six Sigma manufacturing project, m

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Bhonsale, Satyajeet, Dries Telen, Bard Stokbroekx, and Jan Van Impe. "An Analysis of Uncertainty Propagation Methods Applied to Breakage Population Balance." Processes 6, no. 12 (2018): 255. http://dx.doi.org/10.3390/pr6120255.

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In data-driven empirical or hybrid modeling, the experimental data influences the model parameters and thus also the model predictions. The experimental data has some variability due to measurement noise and due to the intrinsic stochastic nature of certain pharmaceutical processes such as aggregation or breakage. To use predictive models, it is imperative that the accuracy of the predictions is known. To this extent, various uncertainty propagation techniques applied to a predictive breakage population balance model are studied. Three uncertainty propagation techniques are studied: linearizat

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Pierce, R. Bradley, Fred M. Reames, Tom H. Zapotocny, Donald R. Johnson, and Bart J. Wolf. "Numerical Investigations with a Hybrid Isentropic–Sigma Model. Part I: Normal-Mode Characteristics." Journal of the Atmospheric Sciences 48, no. 18 (1991): 2005–24. http://dx.doi.org/10.1175/1520-0469(1991)048<2005:niwahi>2.0.co;2.

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James, I. D. "A front-resolving sigma coordinate sea model with a simple hybrid advection scheme." Applied Mathematical Modelling 10, no. 2 (1986): 87–92. http://dx.doi.org/10.1016/0307-904x(86)90076-4.

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18

Eckermann, Stephen. "Hybrid σ–p Coordinate Choices for a Global Model". Monthly Weather Review 137, № 1 (2009): 224–45. http://dx.doi.org/10.1175/2008mwr2537.1.

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Abstract A methodology for choosing a hybrid σ–p (sigma–pressure) vertical coordinate of the Simmons–Strüfing form for a global model is presented. The method focuses on properties of the vertical derivative of the terrain-following coefficient, which affect the smoothness and shape of layer thickness profiles and determines the coordinate’s monotonicity over variable terrain. The method is applied to characterize and interrelate existing hybrid coordinate choices in NWP and climate models, then to design new coordinates with specific properties. Offline tests indicate that the new coordinates

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Toy, Michael D. "A Supercell Storm Simulation Using a Nonhydrostatic Cloud-Resolving Model Based on a Hybrid Isentropic-Sigma Vertical Coordinate." Monthly Weather Review 141, no. 4 (2013): 1204–15. http://dx.doi.org/10.1175/mwr-d-12-00215.1.

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Abstract A three-dimensional simulation of a supercell storm is performed with a nonhydrostatic model based on a hybrid isentropic-sigma vertical coordinate. The coordinate is a terrain-following, height-based coordinate near the surface that smoothly transitions to potential temperature with height. Using isentropic coordinates provides the advantage of having zero cross-coordinate vertical mass flux for adiabatic flow, which virtually eliminates the numerical error in the vertical transport. The model uses an adaptive grid algorithm by which the coordinate surfaces may deviate from their tar

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Yadav, Gunjan, and Tushar N. Desai. "Analyzing Lean Six Sigma enablers: a hybrid ISM-fuzzy MICMAC approach." TQM Journal 29, no. 3 (2017): 488–511. http://dx.doi.org/10.1108/tqm-04-2016-0041.

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Purpose The purpose of this paper is to identify Lean Six Sigma enablers (LSSEs) and analyse the interaction among the enablers via a hierarchical model developed by employing interpretive structural modelling (ISM) and determine the driving and dependence power of enablers through fuzzy MICMAC (Matriced’ Impacts Croise´s Multiplication Applique´ea´un Classement) analysis. Design/methodology/approach An expert group of industry professionals and academicians is consulted at the initial stage as an input for ISM methodology to explore the paired relationship among LSSEs for each parameter of Le

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Valmohammadi, Changiz, Farshad Faezy Razi, and Fereidoun Einy. "Six Sigma Project Selection Using the Hybrid Approach FAHP-FTOPSIS and Grey Relational Analysis Model." IEEE Engineering Management Review 49, no. 2 (2021): 134–46. http://dx.doi.org/10.1109/emr.2021.3071368.

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22

Mitchell, Jennie E., Taku Oshima, Sarah E. Piper, et al. "The Escherichia coli Regulator of Sigma 70 Protein, Rsd, Can Up-Regulate Some Stress-Dependent Promoters by Sequestering Sigma 70." Journal of Bacteriology 189, no. 9 (2007): 3489–95. http://dx.doi.org/10.1128/jb.00019-07.

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ABSTRACT The Escherichia coli Rsd protein forms complexes with the RNA polymerase σ70 factor, but its biological role is not understood. Transcriptome analysis shows that overexpression of Rsd causes increased expression from some promoters whose expression depends on the alternative σ38 factor, and this was confirmed by experiments with lac fusions at selected promoters. The LP18 substitution in Rsd increases the Rsd-dependent stimulation of these promoter-lac fusions. Analysis with a bacterial two-hybrid system shows that the LP18 substitution in Rsd increases its interaction with σ70. Our e

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PROVIDÊNCIA, CONSTANÇA. "RELATIVISTIC HADRONIC MATTER AND PHASE TRANSITIONS." International Journal of Modern Physics E 16, no. 09 (2007): 2680–719. http://dx.doi.org/10.1142/s0218301307008343.

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A brief revision of different relativistic hadronic models, including the original sigma-omega model, models with nonlinear meson terms, density dependent coupling parameters and the quark-meson coupling, are presented. The inclusion of short range correlations is discussed. Dense stellar matter is described within the relativistic hadronic models introduced. We build the EoS for cold and warm hadronic and hybrid stars and discuss the star properties obtained within the different approaches. The low density thermodynamical and dynamical instabilities of stellar matter of interest for the discu

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Zamani, Behnam, and Manfred Koch. "Comparison Between Two Hydrodynamic Models in Simulating Physical Processes of a Reservoir with Complex Morphology: Maroon Reservoir." Water 12, no. 3 (2020): 814. http://dx.doi.org/10.3390/w12030814.

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Two 3D hydrodynamic models, AEM3D and MIKE3, are compared in simulating hydrodynamics of the Maroon Reservoir in southwest Iran. The reservoir has a complex bathymetry with steep walls, which makes it a good case for studying the performance of hydrodynamic models. The models were compared together and with measured water temperatures from different locations of the reservoir in a five-month period between December 2011 and April 2012. The results indicated that the AEM3D model, which uses a finite difference scheme with a purely z-level vertical discretization, showed better consistency with

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Maciołek-Niedźwiecki, Andrzej, Andrzej A. Zdziarski, and Alan P. Lightman. "Acceleration Efficiency in Nonthermal Sources and the Soft Gamma-rays from NGC 4151 Observed by OSSE and SIGMA." Symposium - International Astronomical Union 159 (1994): 379. http://dx.doi.org/10.1017/s0074180900175710.

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We show that the recent observations of the Seyfert galaxy NGC 4151 in hard X-rays and soft γ-rays by the OSSE and SIGMA detectors onboard CGRO and GRANAT, respectively, are well explained by a nonthermal model with acceleration of relativistic electrons at an efficiency of ≲50% and with the remaining power dissipated thermally in the source (the standard nonthermal e± pair model assumed 100% efficiency). Such an acceleration efficiency is generally expected on physical grounds. The resulting model unifies previously proposed purely thermal and purely nonthermal models. The pure nonthermal mod

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Vinodh, S., and Vikas Swarnakar. "Lean Six Sigma project selection using hybrid approach based on fuzzy DEMATEL–ANP–TOPSIS." International Journal of Lean Six Sigma 6, no. 4 (2015): 313–38. http://dx.doi.org/10.1108/ijlss-12-2014-0041.

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Purpose – The purpose of this paper is to select the optimal Lean Six Sigma (LSS) project using hybrid fuzzy-based Multi-Criteria Decision-Making (MCDM) approach for an automotive component manufacturing organization. Design/methodology/approach – The LSS project selection has been formulated as the MCDM problem. Hybrid MCDM method based on Decision-Making Trial and Evaluation Laboratory Model (DEMATEL), Analytical Network Process (ANP) and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) has been used to select the optimal LSS project. The methodology enabled the practi

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Srivastava, H. S., T. Sivasankar, and P. Patel. "THE SENSITIVITY OF C-BAND HYBRID POLARIMETRIC RISAT-1 SAR DATA TO LEAF AREA INDEX OF PADDY CROP." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences IV-5 (November 15, 2018): 215–22. http://dx.doi.org/10.5194/isprs-annals-iv-5-215-2018.

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<p><strong>Abstract.</strong> Active microwave remote sensing data has become an important source to retrieve crop biophysical parameters due to its unique sensitivity towards geometrical, structural and dielectric properties of various crop components. The temporal variability of various crop biophysical parameters during crop cycle has significant impact on the overall crop yield. In this study, two RISAT-1 hybrid polarimetric temporal SAR datasets at &amp;sim;32&amp;deg; incidence angle were acquired during 2015 Kharif season. The in-situ leaf area index (LAI) valu

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SHI, GUO-YOU, and SHUANG LIU. "MODEL SELECTION OF C-SUPPORT VECTOR MACHINES BASED ON MULTI-THREADING GENETIC ALGORITHM." International Journal of Wavelets, Multiresolution and Information Processing 11, no. 05 (2013): 1350041. http://dx.doi.org/10.1142/s0219691313500410.

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Since generalization performance of support vector machines depends a lot on parameter values of kernel functions, it is important to select optimal parameter values. How to finish optimal model selection of C-Support Vector Machines (C-SVM) with satisfiable speed is the main focus of this paper. We can hardly finish training process for large data sets with traditional methods because of long time-consuming cost. To take advantage of multi-threading and genetic algorithms, we studied a hybrid model selection method to select C and sigma of RBF kernel function for C-SVM classifier. This new me

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Mishra, Pratima, and Rajiv Kumar Sharma. "A hybrid framework based on SIPOC and Six Sigma DMAIC for improving process dimensions in supply chain network." International Journal of Quality & Reliability Management 31, no. 5 (2014): 522–46. http://dx.doi.org/10.1108/ijqrm-06-2012-0089.

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Purpose – The purpose of this paper is to introduce a hybrid framework (suppliers, inputs, process, output and customers+define, measure, analyze, improve and control (SIPOC+DMAIC)) aimed at improving supply chain management (SCM) process dimensions in a supply chain (SC) network. Design/methodology/approach – Based upon the critical review of literature, process dimensions (average outgoing quality limit (AOQL), average outgoing quality (AOQ), process Z, defect per million opportunity) critical to SCM performance were identified. A framework consisting of three phases, i.e., design, implement

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Ahmed, Ali, John Page, and John Olsen. "Enhancing Six Sigma methodology using simulation techniques." International Journal of Lean Six Sigma 11, no. 1 (2020): 211–32. http://dx.doi.org/10.1108/ijlss-03-2018-0033.

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Purpose In recent times, the idea of taking advantage of the benefits of simulation techniques and Six Sigma discipline altogether has led various organizations towards implementation of simulation tools within Six Sigma methodology. The purpose of this study is to provide a more comprehensive literature review on the topic exploring how this amalgamation could work both in theory and practice. This precisely entailed finding dependable studies that shows how Six Sigma (DMAIC) Methodology can be enhanced by the three prevalent simulation techniques; Agent-Based (AB), Discrete-Events (DE), Syst

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Fang, Li Cun, Gang Xu, Tian Li Li, and Ke Min Zhu. "Online State of Charge Estimation for Battery of Electric Vehicle Using Sigma-Points Kalman Filters." Applied Mechanics and Materials 427-429 (September 2013): 824–29. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.824.

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An accurate state-of-charge (SOC) estimation of the hybrid electric vehicle (HEV) and electric vehicle (EV) battery pack is a difficult task to be performed online in a vehicle because of the noisy and low accurate measurements and the wide operating conditions in which the vehicle battery can operate. A Sigma-points Kalman Filters (SPKF) algorithm based on an improved Lithium battery cell model to estimate the SOC of a Lithium battery cell is proposed in this paper. The simulation and experiment results show the effectiveness and ease of implementation of the proposed technique.

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Kim, Jung-Hoon, Robert D. Sharman, Stanley G. Benjamin, John M. Brown, Sang-Hun Park, and Joseph B. Klemp. "Improvement of Mountain-Wave Turbulence Forecasts in NOAA’s Rapid Refresh (RAP) Model with the Hybrid Vertical Coordinate System." Weather and Forecasting 34, no. 3 (2019): 773–80. http://dx.doi.org/10.1175/waf-d-18-0187.1.

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Abstract Spurious mountain-wave features have been reported as false alarms of light-or-stronger numerical weather prediction (NWP)-based cruise level turbulence forecasts especially over the western mountainous region of North America. To reduce this problem, a hybrid sigma–pressure vertical coordinate system was implemented in NOAA’s operational Rapid Refresh model, version 4 (RAPv4), which has been running in parallel with the conventional terrain-following coordinate system of RAP version 3 (RAPv3). Direct comparison of vertical velocity |w| fields from the RAPv4 and RAPv3 models shows tha

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Sako, Takashi. "Hadronic interaction studied by TA." EPJ Web of Conferences 210 (2019): 02003. http://dx.doi.org/10.1051/epjconf/201921002003.

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Two studies by the Telescope Array group related to the hadronic interaction observed with Extensive Air Showers are reviewed. (1) Inelastic p-air cross section $ \sigma _{p - air}^{inel} = 567.0 \pm 70.5\,[{\rm{stat]}}_{ - 25}^{ + 29} [{\rm{sys}}]\,{\rm{mb}} $ and total p-p cross section $ \sigma _{p - p}^{tot} = 170_{ - 44}^{ + 48} [{\rm{stat}}]_{ - 17}^{ + 19} [{\rm{sys}}]\,{\rm{mb}} $ were determined using the 5 years of TA hybrid data with one of the 3 FD stations. These results at the highest energy $ \sqrt {S_{NN} } = 95\,{\rm{TeV}} $ showed good agreements with the extrapolation from t

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Tang, Zhong, Wenqiang Li, and Yan Li. "Discretization Analysis Method of Hybrid Reliability Based on Evidence Theory." Mathematical Problems in Engineering 2018 (August 23, 2018): 1–16. http://dx.doi.org/10.1155/2018/9046708.

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Aiming at the problem that various types of uncertainties, such as randomness, fuzziness, and interval, coexist in structure reliability analysis, a discretization analysis method of hybrid reliability for uncertain structures is proposed based on evidence theory (ET) in this article. Firstly, in order to establish a hybrid reliability model based on ET, a generalized density method (GDM) is developed to transform the fuzzy variables into equivalent random variables on the basis of the entropy equivalent method (EEM). Based on the discrete property of the basic probability assignment (BPA) in

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Mahato, Satyajit, Amit Rai Dixit, and Rajeev Agrawal. "Application of Lean Six Sigma for cost-optimised solution of a field quality problem: A case study." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, no. 4 (2017): 713–29. http://dx.doi.org/10.1177/0954405417694060.

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In a price-sensitive market, quality improvement framework also needs to incorporate cost factor. Past research on Lean Six Sigma gives limited insight on any framework catering to quality and cost together. This study aims to contribute in this niche by illustrating a hybrid framework, DMAIoC (define, measure, analyse, improve, optimise and control) to attain desired quality at minimum investment cost by integrating simplex method of optimisation in conventional DMAIC (define, measure, analyse, improve and control) framework. A case study is presented highlighting a field quality rejection pr

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Song, C., S. Maksyutov, D. Belikov, H. Takagi, and J. Shu. "Simulating CO<sub>2</sub> profiles using NIES TM and comparison with HIAPER Pole-to-Pole Observations." Atmospheric Chemistry and Physics Discussions 15, no. 5 (2015): 6745–70. http://dx.doi.org/10.5194/acpd-15-6745-2015.

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Abstract. We present a study on validation of the National Institute for Environmental Studies Transport Model (NIES TM) by comparing to observed vertical profiles of atmospheric CO2. The model uses a hybrid sigma-isentropic (σ–θ) vertical coordinate that employs both terrain-following and isentropic parts switched smoothly in the stratosphere. The model transport is driven by reanalyzed meteorological fields and designed to simulate seasonal and diurnal cycles, synoptic variations, and spatial distributions of atmospheric chemical constituents in the troposphere. The model simulations were ru

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Merriche, Abderrzak, Moufida Benzekka, and Rabia Amour. "Head-on collision of two ion-acoustic solitons in pair-ion plasmas with nonthermal electrons featuring Tsallis distribution." Zeitschrift für Naturforschung A 76, no. 5 (2021): 445–54. http://dx.doi.org/10.1515/zna-2020-0319.

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Abstract The head-on collision between two ion-acoustic solitons (IASs) is studied in pair ions plasmas with hybrid Cairns–Tsallis-distributed electrons. The chosen model is inspired from the experimental studies of Ichiki et al. [Phys. Plasmas 8, 4275 (2001)]. The extended Poincaré–Lighthill–Kuo (PLK) method is employed to obtain the phase shift due to the IASs collision. Both analytical and numerical results reveal that the magnitude of the phase shift is significantly affected by the nonthermal and nonextensive parameters (α and q), the number density ratios (μ and υ) as well as the mass ra

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Choi, S. J., F. X. Giraldo, J. Kim, and S. Shin. "Verification of a non-hydrostatic dynamical core using horizontally spectral element vertically finite difference method: 2-D aspects." Geoscientific Model Development Discussions 7, no. 3 (2014): 3717–50. http://dx.doi.org/10.5194/gmdd-7-3717-2014.

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Abstract. The non-hydrostatic (NH) compressible Euler equations of dry atmosphere are solved in a simplified two dimensional (2-D) slice framework employing a spectral element method (SEM) for the horizontal discretization and a finite difference method (FDM) for the vertical discretization. The SEM uses high-order nodal basis functions associated with Lagrange polynomials based on Gauss–Lobatto–Legendre (GLL) quadrature points. The FDM employs a third-order upwind biased scheme for the vertical flux terms and a centered finite difference scheme for the vertical derivative terms and quadrature

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Shang, Jianga, Xuke Hu, Fuqiang Gu, Di Wang, and Shengsheng Yu. "Improvement Schemes for Indoor Mobile Location Estimation: A Survey." Mathematical Problems in Engineering 2015 (2015): 1–32. http://dx.doi.org/10.1155/2015/397298.

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Location estimation is significant in mobile and ubiquitous computing systems. The complexity and smaller scale of the indoor environment impose a great impact on location estimation. The key of location estimation lies in the representation and fusion of uncertain information from multiple sources. The improvement of location estimation is a complicated and comprehensive issue. A lot of research has been done to address this issue. However, existing research typically focuses on certain aspects of the problem and specific methods. This paper reviews mainstream schemes on improving indoor loca

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Huang, Mengtao, Chao Wang, Bao Liu, Fan Wang, and Jingting Wang. "Quadrature Kalman filter–based state of charge estimation for lithium-ion battery." Advances in Mechanical Engineering 12, no. 7 (2020): 168781402094269. http://dx.doi.org/10.1177/1687814020942696.

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This article presents an approach to lithium-ion battery state of charge estimation based on the quadrature Kalman filter. Among the existing state of charge estimation approaches, the extended Kalman filter–based state of charge and unscented filter–based state of charge algorithms are influenced by the linearization or the solution of sigma points. The proposed quadrature Kalman filter–based state of charge algorithm avoids these problems. Specifically, the battery system equations are built based on the second-order resistance–capacitance equivalent circuit model, and the parameters are ide

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Enz, Sabine, Susanne Mahren, Uwe H. Stroeher, and Volkmar Braun. "Surface Signaling in Ferric Citrate Transport Gene Induction: Interaction of the FecA, FecR, and FecI Regulatory Proteins." Journal of Bacteriology 182, no. 3 (2000): 637–46. http://dx.doi.org/10.1128/jb.182.3.637-646.2000.

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ABSTRACT In Escherichia coli, transcription of the ferric citrate transport genes fecABCDE is controlled by a novel signal transduction mechanism that starts at the cell surface. Binding of ferric citrate to the outer membrane protein FecA initiates a signal that is transmitted by FecR across the cytoplasmic membrane into the cytoplasm where FecI, the sigma factor, is activated. Interaction between the signaling proteins was demonstrated by utilizing two methods. In in vitro binding assays, FecR that was His tagged at the N terminus [(His)10-FecR] and bound to a Ni-nitrilotriacetic acid agaros

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Pithva, N., A. Vyas, D. Rawal, V. Nizalapur, G. Jain, and A. Das. "DEEP LEARNING ALGORITHM FOR URBAN FEATURE EXTRACTION USING SAR DATA." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B3-2021 (June 28, 2021): 93–101. http://dx.doi.org/10.5194/isprs-archives-xliii-b3-2021-93-2021.

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Abstract. This paper aims to discusses the extraction of urban features from airborne NISAR (NASA-ISRO SAR) data using deep learning algorithm for a part of Ahmedabad City. NISAR data is acquired in two wavelength bands (L and S) in hybrid polarization i.e., RH and RV. This study has used level two data viz., amplitude data. Pre-processing of NISAR data in L and S wavelength bands was carried out by using MIDAS, software developed and provided by the Space Applications Centre. Pre-processing viz., Speckle suppression using different filters in varying window sizes, radiometric and geometric ca

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Kang, Hyun-Gyu, and Hyeong-Bin Cheong. "Effect of a High-Order Filter on a Cubed-Sphere Spectral Element Dynamical Core." Monthly Weather Review 146, no. 7 (2018): 2047–64. http://dx.doi.org/10.1175/mwr-d-17-0226.1.

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Abstract A high-order filter for a cubed-sphere spectral element model was implemented in a three-dimensional spectral element dry hydrostatic dynamical core. The dynamical core incorporated hybrid sigma–pressure vertical coordinates and a third-order Runge–Kutta time-differencing method. The global high-order filter and the local-domain high-order filter, requiring numerical operation with a huge sparse global matrix and a locally assembled matrix, respectively, were applied to the prognostic variables, except for surface pressure, at every time step. Performance of the high-order filter was

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Rautenhaus, M., M. Kern, A. Schäfler, and R. Westermann. "Three-dimensional visualization of ensemble weather forecasts – Part 1: The visualization tool Met.3D (version 1.0)." Geoscientific Model Development 8, no. 7 (2015): 2329–53. http://dx.doi.org/10.5194/gmd-8-2329-2015.

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Abstract. We present "Met.3D", a new open-source tool for the interactive three-dimensional (3-D) visualization of numerical ensemble weather predictions. The tool has been developed to support weather forecasting during aircraft-based atmospheric field campaigns; however, it is applicable to further forecasting, research and teaching activities. Our work approaches challenging topics related to the visual analysis of numerical atmospheric model output – 3-D visualization, ensemble visualization and how both can be used in a meaningful way suited to weather forecasting. Met.3D builds a bridge

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Rautenhaus, M., M. Kern, A. Schäfler, and R. Westermann. "3-D visualization of ensemble weather forecasts – Part 1: The visualization tool Met.3D (version 1.0)." Geoscientific Model Development Discussions 8, no. 2 (2015): 2101–60. http://dx.doi.org/10.5194/gmdd-8-2101-2015.

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Abstract. We present Met.3D, a new open-source tool for the interactive 3-D visualization of numerical ensemble weather predictions. The tool has been developed to support weather forecasting during aircraft-based atmospheric field campaigns, however, is applicable to further forecasting, research and teaching activities. Our work approaches challenging topics related to the visual analysis of numerical atmospheric model output – 3-D visualization, ensemble visualization, and how both can be used in a meaningful way suited to weather forecasting. Met.3D builds a bridge from proven 2-D visualiz

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SAKAGUCHI, MAKOTO. "(0,2) CALABI–YAU SIGMA MODELS AND THEIR DUALITY." International Journal of Modern Physics A 13, no. 05 (1998): 779–96. http://dx.doi.org/10.1142/s0217751x98000342.

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N=(0,2) heterotic string theories on Calabi–Yau spaces are considered based on linear sigma approaches. We construct (0,2) sigma models on complete intersection Calabi–Yau spaces, ℳ, realized in a product of weighted projective spaces. The definition of the associating vector bundle V over ℳ is given. These models are formulated as the IR limits of (0,2) U (1)N gauged linear sigma models. Examining their phase structures, we observe that there are hybrid phases where one cannot intrinsically distinguish between the defining polynomials of the Calabi–Yau space ℳ and those of the gauge bundle V.

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Belikov, D. A., S. Maksyutov, V. Sherlock та ін. "Simulations of column-averaged CO<sub>2</sub> and CH<sub>4</sub> using the NIES TM with a hybrid sigma-isentropic (σ-θ) vertical coordinate". Atmospheric Chemistry and Physics 13, № 4 (2013): 1713–32. http://dx.doi.org/10.5194/acp-13-1713-2013.

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Abstract. We have developed an improved version of the National Institute for Environmental Studies (NIES) three-dimensional chemical transport model (TM) designed for accurate tracer transport simulations in the stratosphere, using a hybrid sigma-isentropic (σ-θ) vertical coordinate that employs both terrain-following and isentropic parts switched smoothly around the tropopause. The air-ascending rate was derived from the effective heating rate and was used to simulate vertical motion in the isentropic part of the grid (above level 350 K), which was adjusted to fit to the observed age of the

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Choi, S. J., F. X. Giraldo, J. Kim, and S. Shin. "Verification of a non-hydrostatic dynamical core using the horizontal spectral element method and vertical finite difference method: 2-D aspects." Geoscientific Model Development 7, no. 6 (2014): 2717–31. http://dx.doi.org/10.5194/gmd-7-2717-2014.

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Abstract. The non-hydrostatic (NH) compressible Euler equations for dry atmosphere were solved in a simplified two-dimensional (2-D) slice framework employing a spectral element method (SEM) for the horizontal discretization and a finite difference method (FDM) for the vertical discretization. By using horizontal SEM, which decomposes the physical domain into smaller pieces with a small communication stencil, a high level of scalability can be achieved. By using vertical FDM, an easy method for coupling the dynamics and existing physics packages can be provided. The SEM uses high-order nodal b

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Kawaguchi, Io, and Kentaroh Yoshida. "Hybrid classical integrability in squashed sigma models." Physics Letters B 705, no. 3 (2011): 251–54. http://dx.doi.org/10.1016/j.physletb.2011.09.117.

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Belikov, D. A., S. Maksyutov, V. Sherlock та ін. "Simulations of column-average CO<sub>2</sub> and CH<sub>4</sub> using the NIES TM with a hybrid sigma-isentropic (σ−θ) vertical coordinate". Atmospheric Chemistry and Physics Discussions 12, № 3 (2012): 8053–106. http://dx.doi.org/10.5194/acpd-12-8053-2012.

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Abstract. We have developed an improved version of the National Institute for Environmental Studies (NIES) three-dimensional chemical transport model (TM) designed for accurate tracer transport simulations in the stratosphere, given the use of a hybrid sigma-isentropic (σ−θ) vertical coordinate that employs both terrain following and isentropic parts switched smoothly around the tropopause. The air-ascending rate was derived from the effective heating rate and was used to simulate vertical motion in the isentropic part of the grid (above level 350 K), which was adjusted to fit to the observed

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