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Journal articles on the topic 'LWR models'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Oriolo, Francesco, and Sandro Paci. "Heat and mass transfer models in LWR containment systems." Nuclear Engineering and Design 204, no. 1-3 (2001): 233–50. http://dx.doi.org/10.1016/s0029-5493(00)00314-9.

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2

Chopra, O. K., and W. J. Shack. "Overview of Fatigue Crack Initiation in Carbon and Low-Alloy Steels in Light Water Reactor Environments." Journal of Pressure Vessel Technology 121, no. 1 (1999): 49–60. http://dx.doi.org/10.1115/1.2883667.

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Recent test data illustrate potentially significant effects of light water reactor (LWR) coolant environments on the fatigue resistance of carbon and low-alloy steels. The crack initiation and crack growth characteristics of carbon and low-alloy steels in LWR environments are presented. Decreases in fatigue lives of these steels in high-dissolved-oxygen water are caused primarily by the effect of environment on growth of short cracks <100 μm in depth. The material and loading parameters that influence fatigue life in LWR environments are defined. Statistical models have been developed to es

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3

Zhang, H. M., and T. Kim. "Effects of Relaxation and Anticipation on Riemann Solutions of Payne-Whitham Model." Transportation Research Record: Journal of the Transportation Research Board 1710, no. 1 (2000): 131–35. http://dx.doi.org/10.3141/1710-15.

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The solutions of Riemann problems of a particular higher-order model—the Payne-Whitham (PW) model—are studied using Roe’s flux splitting scheme as presented by Leo and Pretty. Despite numerous works on higher-order models, little is known about Riemann solutions of these models and how relaxation and anticipation affect these solutions. Riemann solutions of the PW model are computed and compared with those of the Lighthill-Whitham-Richards (LWR) model having the same initial (density) data. It was found that faster relaxation forces the PW model to behave much like the LWR model, that strong a

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4

Raza, Asif, and Ming Zhong. "Lane-based short-term urban traffic parameters forecasting using multivariate artificial neural network and locally weighted regression models: A genetic approach." Canadian Journal of Civil Engineering 46, no. 5 (2019): 371–80. http://dx.doi.org/10.1139/cjce-2017-0644.

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Short-term prediction of traffic conditions on urban arterials has recently become increasingly important because of its vital role in the basic traffic management functions and trip decision-making processes. Such information is useful for optimal infrastructure operation, routing, and trip scheduling. However, forecasting models offering a high accuracy at a fine temporal resolution (e.g., 1 or 5 min) and, especially, lane-based are still rare and need special attention. Given the dynamic and stochastic nature of traffic, this study proposes a genetically optimized artificial neural network

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5

Qin, Yanyan, Hao Wang, and Daiheng Ni. "Lighthill-Whitham-Richards Model for Traffic Flow Mixed with Cooperative Adaptive Cruise Control Vehicles." Transportation Science 55, no. 4 (2021): 883–907. http://dx.doi.org/10.1287/trsc.2021.1057.

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In the future, road traffic will incorporate a random mix of manual vehicles and cooperative adaptive cruise control (CACC) vehicles, where a CACC vehicle will degrade to an adaptive cruise control (ACC) vehicle when vehicle-to-vehicle communications are not available. This paper proposes a generalized framework of the Lighthill-Whitham-Richards (LWR) model for such mixed vehicular flow under different CACC penetration rates. In this approach, the kinematic wave speed propagating through the mixed platoon was theoretically proven to be the slope of mixed fundamental diagram. In addition, the r

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6

Iftikhar, Amir, Zawar H. Khan, T. Aaron Gulliver, et al. "Macroscopic Traffic Flow Characterization at Bottlenecks." Civil Engineering Journal 6, no. 7 (2020): 1227–42. http://dx.doi.org/10.28991/cej-2020-03091543.

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Traffic congestion is a significant issue in urban areas. Realistic traffic flow models are crucial for understanding and mitigating congestion. Congestion occurs at bottlenecks where large changes in density occur. In this paper, a traffic flow model is proposed which characterizes traffic at the egress and ingress to bottlenecks. This model is based on driver response which includes driver reaction and traffic stimuli. Driver reaction is based on time headway and driver behavior which can be classified as sluggish, typical or aggressive. Traffic stimuli are affected by the transition width a

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7

Imran, Waheed, Zawar H. Khan, T. A. Gulliver, Khurram S. Khattak, Salman Saeed, and M. Sagheer Aslam. "Macroscopic Traffic Flow Characterization for Stimuli Based on Driver Reaction." Civil Engineering Journal 7, no. 1 (2021): 1–13. http://dx.doi.org/10.28991/cej-2021-03091632.

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The design and management of infrastructure is a significant challenge for traffic engineers and planners. Accurate traffic characterization is necessary for effective infrastructure utilization. Thus, models are required that can characterize a variety of conditions and can be employed for homogeneous, heterogeneous, equilibrium and non-equilibrium traffic. The Lighthill-Whitham-Richards (LWR) model is widely used because of its simplicity. This model characterizes traffic behavior with small changes over a long idealized road and so is inadequate for typical traffic conditions. The extended

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8

Toptan, Aysenur, Nathan W. Porter, Robert K. Salko, and Maria N. Avramova. "Implementation and assessment of wall friction models for LWR core analysis." Annals of Nuclear Energy 115 (May 2018): 565–72. http://dx.doi.org/10.1016/j.anucene.2018.02.022.

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9

Hou, Jason, Maria Avramova, and Kostadin Ivanov. "Best-Estimate Plus Uncertainty Framework for Multiscale, Multiphysics Light Water Reactor Core Analysis." Science and Technology of Nuclear Installations 2020 (July 31, 2020): 1–18. http://dx.doi.org/10.1155/2020/7526864.

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Tremendous work has been done in the Light Water Reactor (LWR) Modelling and Simulation (M&S) uncertainty quantification (UQ) within the framework of the Organization for Economic Cooperation and Development (OECD)/Nuclear Energy Agency (NEA) LWR Uncertainty Analysis in Modelling (UAM) benchmark, which aims to investigate the uncertainty propagation in all M&S stages of the LWRs and to guide uncertainty and sensitivity analysis methodology development. The Best-Estimate Plus Uncertainty (BEPU) methodologies have been developed and implemented within the framework of the LWR UAM benchma

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10

Briani, Maya, Emiliano Cristiani, and Paolo Ranut. "Macroscopic and Multi-Scale Models for Multi-Class Vehicular Dynamics with Uneven Space Occupancy: A Case Study." Axioms 10, no. 2 (2021): 102. http://dx.doi.org/10.3390/axioms10020102.

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In this paper, we propose two models describing the dynamics of heavy and light vehicles on a road network, taking into account the interactions between the two classes. The models are tailored for two-lane highways where heavy vehicles cannot overtake. This means that heavy vehicles cannot saturate the whole road space, while light vehicles can. In these conditions, the creeping phenomenon can appear, i.e., one class of vehicles can proceed even if the other class has reached the maximal density. The first model we propose couples two first-order macroscopic LWR models, while the second model

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11

Li, Yuanqi, Xiaoliang Qin, Jinhui Luo, Meng Xiao, and Cong Hua. "Uplift Test and Design Method for Bearing Capacity of Isolated Spread Concrete Foundation Slab with Large Width-to-Height Ratio." Advances in Civil Engineering 2018 (November 15, 2018): 1–16. http://dx.doi.org/10.1155/2018/3672868.

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This paper is focused on the experimental study and numerical simulation of isolated spread concrete foundation slab with a large width-to-height ratio (in short ISCFS-LWR) to investigate the failure modes and uplift bearing capacity, as well as the design method of uplift capacity. First, a total of 16 isolated spread concrete foundation slabs with the width-to-height ratio varied from 1.5 to 4 and the hypotenuse slope varied from 10° to 30° were tested under uplift load. Based on the test results, effects of the width-to-height ratio and the hypotenuse slope on uplift bearing capacity of ISC

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12

Maciejewski, M. "Comparison of the one-equation LWR models for density and for speed." IOP Conference Series: Materials Science and Engineering 421 (October 11, 2018): 022020. http://dx.doi.org/10.1088/1757-899x/421/2/022020.

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13

Bengil, Elizabeth Grace Tunka. "A regional evaluation of lessepsian migrant Upeneus moluccensis (Bleeker, 1855) length and weight relationships from the Mediterranean Sea." Vol:36 Issue:3 36, no. 3 (2019): 255–63. http://dx.doi.org/10.12714/egejfas.2019.36.3.06.

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The length and weight relationships (LWRs) of goldband goatfish found in the coasts of Cyprus was studied, and both prediction capacity of the model as well as a regional prediction capacity by testing developed models from the Mediterranean basin were evaluated. A total of 219 individuals were obtained monthly between November 2017-April 2018. LWR models taken from total length and fork length measurements were developed for female and male samples and combined with a maximum 36% error in estimations. Results indicated that LWR modelling based on sexes does not provide any improvement for unc

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14

Bernal, A., M. Pecchia, D. Rochman, A. Vasiliev, and H. Ferroukhi. "METHODOLOGY FOR HIGH-FIDELITY DETERMINISTIC MODELLING OF SWISS LWR FUEL ASSEMBLIES." EPJ Web of Conferences 247 (2021): 06011. http://dx.doi.org/10.1051/epjconf/202124706011.

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The main goal of this work is to perform pin-by-pin calculations of Swiss LWR fuel assemblies with neutron transport deterministic methods. At Paul Scherrer Institut (PSI), LWR calculations are performed with the core management system CMSYS, which is based on the Studsvik suite of codes. CMSYS includes models for all the Swiss reactors validated against a database of experimental information. Moreover, PSI has improved the pin power calculations by developing models of Swiss fuel assemblies for the Monte Carlo code MCNP, with the isotopic compositions obtained from the In-Core Fuel Management

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15

Towers, John D. "A splitting algorithm for LWR traffic models with flux discontinuous in the unknown." Journal of Computational Physics 421 (November 2020): 109722. http://dx.doi.org/10.1016/j.jcp.2020.109722.

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16

Morimoto, Susumu, W. F. McClure, Benett Crowell, and Donald L. Stanfield. "Near Infrared Technology for Precision Environmental Measurements: Part 2. Determination of Carbon in Green Grass Tissue." Journal of Near Infrared Spectroscopy 11, no. 4 (2003): 257–67. http://dx.doi.org/10.1255/jnirs.372.

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Composting is one of the most desirable techniques for reducing waste volume. To make good compost, the correct proportions of the elements carbon and nitrogen (30: 1 ratio) are important. In this paper, carbon quantification of green grass tissue using near infrared (NIR) technology was studied. Separate studies were conducted for the short-wavelength region (SWR = 700–1100 nm, a range that includes part of the visible spectrum) and long-wavelength region (LWR = 1100–2500 nm). Several spectral pretreatments (such as SNV, derivatives etc.) were implemented to optimise the stepwise multiple lin

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17

Jia, Wangqiang, Long Yuan, Hongyan Ni, Benling Xu, and Peng Zhao. "Prognostic Value of Platelet-to-Lymphocyte Ratio, Neutrophil-to-Lymphocyte Ratio, and Lymphocyte-to-White Blood Cell Ratio in Colorectal Cancer Patients Who Received Neoadjuvant Chemotherapy." Technology in Cancer Research & Treatment 20 (January 1, 2021): 153303382110342. http://dx.doi.org/10.1177/15330338211034291.

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Background: The objective of this study was to assess the prognostic value of pretreatment platelet-to-lymphocyte ratio (PLR), neutrophil-to-lymphocyte ratio (NLR), and lymphocyte-to-white blood cell ratio (LWR) of CRC patients who received neoadjuvant chemotherapy. Methods: We analyzed the peripheral blood routine parameters and other clinical data of 145 patients with colorectal cancer who had undergone neoadjuvant chemotherapy between January 2011 and February 2014. Pretreatment blood parameters of 145 patients were collected, and PLR, NLR, and LWR were calculated. The utility of PLR, NLR,

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18

Raza, Asif, and Ming Zhong. "Lane-based short-term urban traffic forecasting with GA designed ANN and LWR models." Transportation Research Procedia 25 (2017): 1430–43. http://dx.doi.org/10.1016/j.trpro.2017.05.169.

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19

Krishnan, Praveena, Tilden P. Meyers, Simon J. Hook, Mark Heuer, David Senn, and Edward J. Dumas. "Intercomparison of In Situ Sensors for Ground-Based Land Surface Temperature Measurements." Sensors 20, no. 18 (2020): 5268. http://dx.doi.org/10.3390/s20185268.

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Land surface temperature (LST) is a key variable in the determination of land surface energy exchange processes from local to global scales. Accurate ground measurements of LST are necessary for a number of applications including validation of satellite LST products or improvement of both climate and numerical weather prediction models. With the objective of assessing the quality of in situ measurements of LST and to evaluate the quantitative uncertainties in the ground-based LST measurements, intensive field experiments were conducted at NOAA’s Air Resources Laboratory (ARL)’s Atmospheric Tur

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20

Rompis, Semuel Y. R., and Filmon G. Habtemichael. "Calibration of Traffic Incident Simulation Models Using Field Data." International Journal of Sustainable Transportation Technology 2, no. 1 (2019): 19–26. http://dx.doi.org/10.31427/ijstt.2019.2.1.3.

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This study presents a methodology to calibrate a traffic incident simulation model, particularly in a freeway. The queue length was used as the objective of the simulation model calibration in this study. The simulation model was set up using Traffic Simulation Model PTV. VISSIM. Multiple incident durations were simulated, and the generated queue lengths were compared to the observed queue lengths. The observed queue lengths were estimated using the LWR model and shockwave speeds calculated using the field data. The results confirm that calibrated VISSIM incident model can signify the shockwav

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21

Jernkvist, Lars O. "Modelling of fine fragmentation and fission gas release of UO2 fuel in accident conditions." EPJ Nuclear Sciences & Technologies 5 (2019): 11. http://dx.doi.org/10.1051/epjn/2019030.

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In reactor accidents that involve rapid overheating of oxide fuel, overpressurization of gas-filled bubbles and pores may lead to rupture of these cavities, fine fragmentation of the fuel material, and burst-type release of the cavity gas. Analytical rupture criteria for various types of cavities exist, but application of these criteria requires that microstructural characteristics of the fuel, such as cavity size, shape and number density, are known together with the gas content of the cavities. In this paper, we integrate rupture criteria for two kinds of cavities with models that calculate

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22

Tiftikçi, A., and C. Kocar. "Investigation of turbulence models for a fully-periodic LWR unit-cell in lattice-Boltzmann framework." Progress in Nuclear Energy 104 (April 2018): 160–71. http://dx.doi.org/10.1016/j.pnucene.2017.09.011.

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23

Vikram, Durgesh, Partha Chakroborty, and Sanjay Mittal. "Exploring the Behavior of LWR Continuum Models of Traffic Flow in Presence of Shock Waves." Procedia - Social and Behavioral Sciences 104 (December 2013): 412–21. http://dx.doi.org/10.1016/j.sbspro.2013.11.134.

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24

Aragón-Noriega, E. Alberto, Edgar Alcántara-Razo, Jesús G. Padilla-Serrato, Guillermo Rodríguez-Domínguez, and Sergio G. Castillo-Vargasmachuca. "Morphological notes on Pinnaxodes gigas Green, 1992 (Brachyura, Pinnotheridae) emphasizing on length-weight relationship under multi-model approach." Crustaceana 92, no. 9 (2019): 1081–97. http://dx.doi.org/10.1163/15685403-00003932.

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Abstract This study describes biometric characteristics of the pea crab Pinnaxodes gigas, a symbiont of the geoduck clam Panopea globosa in the eastern-central Gulf of California. Differences were observed in the coefficient of allometry when length-weight relationships (LWR) were analysed under a multi-model approach. The winner model for LWR in females was that exhibiting two phases (”two-segments” and “broken-stick”), while in males the models cubic and quadratic, presenting a continuous change in coefficient of allometry along all sizes, were chosen as the best. The relationships of carapa

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25

Friedrich, Jan, Oliver Kolb, and Simone Göttlich. "A Godunov type scheme for a class of LWR traffic flow models with non-local flux." Networks & Heterogeneous Media 13, no. 4 (2018): 531–47. http://dx.doi.org/10.3934/nhm.2018024.

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26

Grandi, Gerardo, Rodolfo Ferrer, and Tamer Bahadir. "APPLICATION OF STUDSVIK’S CMS5 CODE SYSTEM TO ACCIDENT TOLERANT FUEL CORE DESIGN AND ANALYSIS." EPJ Web of Conferences 247 (2021): 02020. http://dx.doi.org/10.1051/epjconf/202124702020.

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The possible deployment of Accident Tolerant Fuels (ATF) for currently-operating Light Water Reactors (LWR) has prompted interest in the use of Studsvik’s CMS5 code system to support the analysis of such advanced ATF core designs. Various ATF concepts have been proposed; for example, uranium silicide (U3Si2) fuel, together with iron-based (FeCrAl) cladding. The purpose of this work is to showcase the application of the CMS5 code system, which includes the CASMO5 advanced lattice physics code and the SIMULATE5 three-dimensional nodal simulator, to the analysis of a U3Si2/FeCrAl ATF concept. Giv

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27

Higuchi, Makoto, and Katsumi Sakaguchi. "Review and Consideration of Unsettled Problems on Evaluation of Fatigue Damage in LWR Water." Journal of Pressure Vessel Technology 129, no. 1 (2006): 186–94. http://dx.doi.org/10.1115/1.2409316.

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Reduction in the fatigue life of structural materials of nuclear components in Light Water Reactor (LWR) water was initially detected and examined by the authors in the 1980s, who subsequently directed considerable effort to the development of a method for evaluating this reduction quantitatively. Since the first proposal of equations to calculate environmental fatigue life reduction for carbon and low-alloy steels was published in 1985 by Higuchi and Sakamoto (J. Iron Steel Inst. Jpn. 71, pp. 101–107), many revisions were made based on a lot of additional fatigue data in various environmental

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28

Rochman, Dimitri A., Alexander Vasiliev, Abdelhamid Dokhane, and Hakim Ferroukhi. "Uncertainties for Swiss LWR spent nuclear fuels due to nuclear data." EPJ Nuclear Sciences & Technologies 4 (2018): 6. http://dx.doi.org/10.1051/epjn/2018005.

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This paper presents a study of the impact of the nuclear data (cross sections, neutron emission and spectra) on different quantities for spent nuclear fuels (SNF) from Swiss power plants: activities, decay heat, neutron and gamma sources and isotopic vectors. Realistic irradiation histories are considered using validated core follow-up models based on CASMO and SIMULATE. Two Pressurized and one Boiling Water Reactors (PWR and BWR) are considered over a large number of operated cycles. All the assemblies at the end of the cycles are studied, being reloaded or finally discharged, allowing spanni

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29

Simoni, Michele D., and Christian G. Claudel. "A Fast Lax–Hopf Algorithm to Solve the Lighthill–Whitham–Richards Traffic Flow Model on Networks." Transportation Science 54, no. 6 (2020): 1516–34. http://dx.doi.org/10.1287/trsc.2019.0951.

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Efficient and exact algorithms are important for performing fast and accurate traffic network simulations with macroscopic traffic models. In this paper, we extend the semianalytical Lax–Hopf algorithm in order to compute link inflows and outflows with the Lighthill–Whitham–Richards (LWR) model. Our proposed fast Lax–Hopf algorithm has a very low computational complexity. We demonstrate that some of the original algorithm’s operations (associated with the initial conditions) can be discarded, leading to a faster computation of boundary demands/supplies in network simulation problems for genera

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30

Higuchi, Makoto. "Revised Proposal of Fatigue Life Correction Factor Fen for Carbon and Low Alloy Steels in LWR Water Environments." Journal of Pressure Vessel Technology 126, no. 4 (2004): 438–44. http://dx.doi.org/10.1115/1.1767860.

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The fatigue life of carbon and low alloy steels decreases with reduction in strain rate in high temperature water such as in the case of a light water reactor coolant. The fatigue life reduction also depends on temperature and dissolved oxygen. The fatigue life correction factor Fen has been proposed as a method to assess the fatigue life reduction in such environments. Three different models for calculating Fen for carbon and low alloy steels have been proposed by Higuchi et al., Chopra et al., and Mehta. These models were compared using considerable environmental fatigue data that were teste

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31

Vasiliev, Alexander, Marco Pecchia, Dimitri Rochman, Hakim Ferroukhi, and Erwin Alhassan. "On the impact of nuclear data uncertainties on LWR neutron dosimetry assessments." EPJ Web of Conferences 239 (2020): 22003. http://dx.doi.org/10.1051/epjconf/202023922003.

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In this work, an overview on the relevance of the nuclear data (ND) uncertainties with respect to the Light Water Reactors (LWR) neutron dosimetry is presented. The paper summarizes results of several studies realized at the LRT laboratory of the Paul Scherrer Institute over the past decade. The studies were done using the base LRT calculation methodology for dosimetry assessments, which involves the neutron source distribution representation, obtained based on validated CASMO/SIMULATE core follow calculation models, and the subsequent neutron transport simulations with the MCNP® software. The

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32

Khan, Zawar Hussain, Thomas Aaron Gulliver, and Waheed Imran. "A Macroscopic Traffic Model Based on the Safe Velocity at Transitions." Civil Engineering Journal 7, no. 6 (2021): 1060–69. http://dx.doi.org/10.28991/cej-2021-03091710.

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The increasing volume of vehicles on the road has had a significant impact on traffic flow. Congestion in urban areas is now a major concern. To mitigate congestion, an accurate model is required which is based on realistic traffic dynamics. A new traffic model is proposed based on the conservation law of vehicles which considers traffic dynamics at transitions. Traffic alignment to forward conditions is affected by the time and distance between vehicles. Thus, the well-known Lighthill, Whitham, and Richards (LWR) model is modified to account for traffic behavior during alignment. A model for

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Higuchi, Makoto, Kazuya Tsutsumi, Akihiko Hirano, and Katsumi Sakaguchi. "A Proposal of Fatigue Life Correction Factor Fen for Austenitic Stainless Steels in LWR Water Environments." Journal of Pressure Vessel Technology 125, no. 4 (2003): 403–10. http://dx.doi.org/10.1115/1.1613945.

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The fatigue life of austenitic stainless steel has recently been shown to undergo remarkable reduction with decrease in strain rate and increase in temperature in water. Either of these parameters as a factor of this reduction has been examined quantitatively and methods for predicting the fatigue life reduction factor Fen in any given set of conditions have been proposed. All these methods are based primarily on fatigue data in simulated PWR water owing to the few data available in simulated BWR water. Recent Japanese fatigue data in simulated BWR water clearly indicated the effects of the en

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Agelet, Lidia Esteve, Charles R. Hurburgh, Feng Mao, James J. Gaunt, and Say Kee Ong. "Permeation Studies of PVC Pipes with near Infrared Spectroscopy." Journal of Near Infrared Spectroscopy 15, no. 5 (2007): 283–89. http://dx.doi.org/10.1255/jnirs.737.

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Polyvinyl chloride (PVC) pipes are commonly used to transport drinking water. Although PVC is resistant to natural environmental conditions, organic solvents may attack the pipe wall causing swelling, softening, water lines failure and drinking water pollution. Leaks from underground storage tanks and random accidental spills of organic solvents or fuels place the pipes in contact with organic solvents. Near infrared (NIR) spectroscopy was used to track the permeation of PVC pipes by three major organic solvents (toluene, benzene and gasoline) at different concentrations. Partial least squares

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35

Canuti, E., A. Petruzzi, F. D'Auria, and T. Kozlowski. "Sensitivity Studies for the Exercise I-1 of the OECD/UAM Benchmark." Science and Technology of Nuclear Installations 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/817185.

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OECD/NEA has initiated an international Uncertainty Analysis in Modeling (UAM) benchmark focused on uncertainties in modeling of Light Water Reactor (LWR). The first step of uncertainty propagation is to perform sensitivity to the input data affected by the numerical errors and physical models. The objective of the present paper is to study the effect of the numerical discretization error and the manufacturing tolerances on fuel pin lattice integral parameters (multiplication factor and macroscopic cross-sections) through sensitivity calculations. The two-dimensional deterministic codes NEWT a

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36

Sánchez, V. H., M. Thieme, and W. Tietsch. "Validation and Application of the Thermal Hydraulic System Code TRACE for Analysis of BWR Transients." Science and Technology of Nuclear Installations 2012 (2012): 1–9. http://dx.doi.org/10.1155/2012/247482.

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The Karlsruhe Institute of Technology (KIT) is participating on (Code Applications and Maintenance Program) CAMP of the US Nuclear Regulatory Commission (NRC) to validate TRACE code for LWR transient analysis. The application of TRACE for the safety assessment of BWR requires a throughout verification and validation using experimental data from separate effect and integral tests but also using plant data. The validation process is normally focused on safety-relevant phenomena for example, pressure drop, void fraction, heat transfer, and critical power models. The purpose of this paper is to va

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37

Shaffer, Ronald E., and Roger J. Combs. "Comparison of Spectral and Interferogram Processing Methods Using Simulated Passive Fourier Transform Infrared Remote Sensing Data." Applied Spectroscopy 55, no. 10 (2001): 1404–13. http://dx.doi.org/10.1366/0003702011953540.

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Computer-generated synthetic single-beam spectra and interferograms provide a means of comparing signal processing strategies that are employed with passive Fourier transform infrared (FT-IR) sensors. With the use of appropriate radiance models and spectrometer characteristics, synthetic data are generated for one-, two-, and four-component mixtures of organic vapors (ethanol, methanol, acetone, and methyl ethyl ketone) in two passive FT-IR remote sensing scenarios. The single-beam spectra are processed by using Savitsky–Golay smoothing and first-derivative and second-derivative filters. Inter

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38

Rożeń, Antoni. "Modelling of a passive autocatalytic hydrogen recombiner – a parametric study." Nukleonika 60, no. 1 (2015): 161–69. http://dx.doi.org/10.1515/nuka-2015-0002.

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Abstract Operation of a passive autocatalytic hydrogen recombiner (PAR) has been investigated by means of computational fluid dynamics methods (CFD). The recombiner is a self-active and self-adaptive device used to remove hydrogen from safety containments of light water nuclear reactors (LWR) by means of a highly exothermic reaction with oxygen at the surface of a platinum or palladium catalyst. Different turbulence models (k-ω, k-ɛ, intermittency, RSM) were applied in numerical simulations of: gas flow, heat and mass transport and chemical surface reactions occurring in PAR. Turbulence was fo

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39

Arenas, C., R. Bratton, F. Reventos, and K. Ivanov. "Uncertainty Analysis of Light Water Reactor Fuel Lattices." Science and Technology of Nuclear Installations 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/437409.

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The study explored the calculation of uncertainty based on available cross-section covariance data and computational tool on fuel lattice levels, which included pin cell and the fuel assembly models. Uncertainty variations due to temperatures changes and different fuel compositions are the main focus of this analysis. Selected assemblies and unit pin cells were analyzed according to the OECD LWR UAM benchmark specifications. Criticality and uncertainty analysis were performed using TSUNAMI-2D sequence in SCALE 6.1. It was found that uncertainties increase with increasing temperature, whilekinf

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Yousif, Eltayeb, Zhijian Zhang, Zhaofei Tian, and Hao-ran Ju. "Simulation and Analysis of Small Break LOCA for AP1000 Using RELAP5-MV and Its Comparison with NOTRUMP Code." Science and Technology of Nuclear Installations 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/4762709.

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Many reactor safety simulation codes for nuclear power plants (NPPs) have been developed. However, it is very important to evaluate these codes by testing different accident scenarios in actual plant conditions. In reactor analysis, small break loss of coolant accident (SBLOCA) is an important safety issue. RELAP5-MV Visualized Modularization software is recognized as one of the best estimate transient simulation programs of light water reactors (LWR). RELAP5-MV has new options for improved modeling methods and interactive graphics display. Though the same models incorporated in RELAP5/MOD 4.0

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Lo Frano, R., and G. Forasassi. "Buckling of Imperfect Thin Cylindrical Shell under Lateral Pressure." Science and Technology of Nuclear Installations 2008 (2008): 1–8. http://dx.doi.org/10.1155/2008/685805.

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The strength of thin shells, under external pressure, is highly dependent by the nature of imperfection. This paper investigates buckling behaviour of imperfect thin cylindrical shells with analytical, numerical, and experimental methods in conditions for which, at present, a complete theoretical analysis was not found in literature. In general, collapse is initiated by yielding, but interaction with geometrical instabilities is meaningful, in that imperfections reduce the load bearing capacity by an amount of engineering significance also when thickness is considerable. The aim of this study

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Barrachin, Marc. "Corium Experimental Thermodynamics: A Review and Some Perspectives." Thermo 1, no. 2 (2021): 179–204. http://dx.doi.org/10.3390/thermo1020013.

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More than 30 years ago a specialist meeting was held at Joint Research Center Ispra (Italy) from 15 to 17 January 1990 to review the current understanding of chemistry during severe accidents in light water reactors (LWR). Let us consider that, at the end of the 1980s, thermodynamics introduced in the severe accident codes was really poor. Only some equilibrium constants for a few simple reactions between stoichiometric compounds were used as well as some simple correlations giving estimates of solidus and liquidus temperatures. In the same time, the CALPHAD method was developed and was full o

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COSTA, Edson Vinícius, Henrique Torres VENTURA, Elsio Antônio Pereira FIGUEIREDO, et al. "Multi-trait and repeatability models for genetic evaluation of litter traits in pigs considering different farrowings." Revista Brasileira de Saúde e Produção Animal 17, no. 4 (2016): 666–76. http://dx.doi.org/10.1590/s1519-99402016000400010.

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SUMMARY We aimed to compare multi-trait and repeatability models to estimate genetic parameters for the traits number of piglets born alive (NBA) and alive at 3 week of age (NP3), litter weight at birth (LW0) and at 3 week of age (LW3), and mean piglet weight at birth (MW0) and at 3 week of age (MW3), considering the first three farrowings of Landrace sows. Heritability (h2) estimates showed an increasing pattern up to the third farrowing for LW0 and MW3. For NBA, NP3, LW3, and MW0 h2 increased from the first to the second and decreased from the second to the third farrowing. In general, herit

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Peña Giraldo, Mauricio Vladimir, Edilberto Carlos Vivas Gonzales, and Carol Ivonn Rodríguez Feliciano. "Modelamiento Dinámico y control LQR de un Quadrotor." Avances Investigación en Ingeniería 13, no. 1 (2010): 71. http://dx.doi.org/10.18041/1794-4953/avances.1.359.

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Este trabajo deduce el modelo dinámico de un Quadrotor, que consiste en una estructura central donde se encuentran las baterías y la aviónica del dispositivo unida a cuatro largueros con un conjunto propulsor (motor-hélice) en el extremo de cada larguero, formando una cruz perfecta brindando la posibilidad de sustentarse en el aire controlando su orientación y traslación. Múltiples artículos hablan de este modelo dinámico en los cuales se hacen suposiciones para vehículos bajo techo, simplificando considerablemente la complejidad del modelo. Por esta razón se modela físicamente la dinámica del

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Chabanne, Delphine, Hugh Finn, Chandra Salgado-Kent, and Lars Bedjer. "Identification of a resident community of bottlenose dolphins (Tursiops aduncus) in the Swan Canning Riverpark, Western Australia, using behavioural information." Pacific Conservation Biology 18, no. 4 (2012): 247. http://dx.doi.org/10.1071/pc120247.

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Identifying appropriate management units is vital for wildlife management. Here we investigate one potential management unit — resident communities of bottlenose dolphins — using information from ranging, occupancy, and association patterns. We identify a resident community of Indo-Pacific bottlenose dolphins (Tursiops aduncus) in the Swan Canning Riverpark, Western Australia based on: ranging patterns, sighting rates, Lagged Identification Rates (LIR), and three measures of social affinity and structure (Simple Ratio Index, preferred dyadic association analyses, and Lagged Association Rates (

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Perrin, C., V. Andréassian, and C. Michel. "Simple benchmark models as a basis for model efficiency criteria." River Systems 17, no. 1-2 (2006): 221–44. http://dx.doi.org/10.1127/lr/17/2006/221.

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Naumov, Vadim, Sergey Gusak, and Andrey Naumov. "Small nuclear power plants for power supply in arctic regions: assessment of spent nuclear fuel radioactivity." Nuclear Energy and Technology 4, no. 2 (2018): 119–25. http://dx.doi.org/10.3897/nucet.4.30677.

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The purpose of the present study is the investigation of mass composition of long-lived radionuclides accumulated in the fuel cycle of small nuclear power plants (SNPP) as well as long-lived radioactivity of spent fuel of such reactors. Analysis was performed of the published data on the projects of SNPP with pressurized water-cooled reactors (LWR) and reactors cooled with Pb-Bi eutectics (SVBR). Information was obtained on the parameters of fuel cycle, design and materials of reactor cores, thermodynamic characteristics of coolants of the primary cooling circuit for reactor facilities of diff

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Kamau, Kiruma Melchizedecs, Prof Johana K. Sigey, Dr Jeconia A. Okelo, and Dr James Okwoyo. "Inhomogeneous LWR Traffic Flow Model and its Application to Kisii – Kisumu Highway in Kenya." SIJ Transactions on Computer Science Engineering & its Applications (CSEA) 02, no. 06 (2014): 12–17. http://dx.doi.org/10.9756/sijcsea/v2i6/0207720102.

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Cuzzola, Francesco A., and Sergio Bittanti. "ROBUST FAULT DETECTION BY LFR MODELS." IFAC Proceedings Volumes 35, no. 1 (2002): 173–78. http://dx.doi.org/10.3182/20020721-6-es-1901.00760.

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Kudinov, Y. I., F. F. Pashchenko, A. Y. Kelina, D. I. Vasutin, E. S. Duvanov, and A. F. Pashchenko. "Analysis of Control System Models with Conventional LQR and Fuzzy LQR Controller." Procedia Computer Science 150 (2019): 737–42. http://dx.doi.org/10.1016/j.procs.2019.02.007.

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