Relevant bibliographies by topics / LWR modely

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Academic literature on the topic 'LWR modely'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "LWR modely"

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Cohen, Scott, Paul Kileny, Ramon M. Esclamado, and Steven Telian. "Correlation between the Laryngeal Brain Stem Evoked Response and the Laryngeal Chemoreflex in the Porcine Model." Annals of Otology, Rhinology & Laryngology 102, no. 2 (February 1993): 92–99. http://dx.doi.org/10.1177/000348949310200203.

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The laryngeal brain stem evoked response (LBR) represents the neural activity involved in laryngeal reflex pathways. The laryngeal chemoreflex (LCR) is a centrally mediated response consisting of apnea and hemodynamic changes that result from laryngeal stimulation. The purpose of this study is to determine the characteristics of the LBR that are predictive of LCR severity in the porcine model. The duration of apnea resulting from stimulation of the supraglottic larynx defined LCR severity. The LBR tracings were recorded from electrodes flanking the brain stem following direct electrical stimulation of the superior laryngeal nerve. The LBR peak latencies from piglets demonstrating prolonged LCR apnea were compared to those without an exaggerated LCR response. Two LBR peak latencies demonstrated a statistically significant difference between the two piglet groups. These peak latencies appear to be indicators of susceptibility to exaggerated laryngeal reflex sensitivity. Thus, the LBR may prove useful in identifying and evaluating subjects predisposed to conditions associated with dysfunctional laryngeal reflex activity.
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Mao, Xue-Han, Yan Xu, Yuting Yan, Jiahui Liu, Huishou Fan, Weiwei Sui, Shuhui Deng, et al. "Development and Analysis of a Weighed Prognostic Model in Newly Diagnosed Multiple Myeloma Patients." Blood 136, Supplement 1 (November 5, 2020): 47–48. http://dx.doi.org/10.1182/blood-2020-140464.

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Background and Objective: Multiple myeloma (MM) is characterized with significant cytogenetic changes and complex tumor microenvironment, thus patient survival is extremely heterogeneous. Various disease-related or patient-related factors affect the prognosis of patients. This study tried to analyze the prognostic indicators of patients with newly-treated MM, especially explored the prognosis of multiple cytogenetic abnormalities and the ratio of lymphocytes to monocytes (LMR). Additionally, we established a comprehensive prognostic model to help determine the patient prognosis. Methods: After screening, 603 patients of untreated MM from January 2008 to June 2017, with complete baseline indicators were enrolled into the study. By univariate and multivariate Cox analysis, risk factors related to the prognosis of patients were evaluated, and a weighted prognosis model was established to compare the survival differences of patients in each risk stratification. Result: Optimal thresholds of ALC, LWR, NLR and LMR were determined by ROC curve and Youdex index: ALC = 1.415, LWR = 0.325, NLR = 1.935, LMR = 2.95. Survival analysis showed that patients with LMR ≤ 2.95, ALC ≥ 1.415 and LWR ≥ 0.325 had significantly better survival compared with their respective control groups. Cox multivariate analysis showed that among the four indicators, only LMR≤2.95 was an independent adverse prognostic factor for overall survival (OS)(Figure 1A). 17p deletion, 1q21 amplification, t (4; 14) / t (14; 16) were define as high-risk cytogenetic abnormalities (HRA). Of the 603 patients, about 60% were associated with at least one high-risk cytogenetic event. Among them, the occurrence of cumulative 0, 1, 2, and 3 HRA were 39.6% (239/603), 42.5% (256/603), 16.6% (100/603), and 1.3% (8/603), respectively. There was no significant difference in survival among patients with same number of HRAs. The median OS of patients with 0, 1 and ≥ 2 HRA were not reached, 62.1 months (95% CI, 49.3-74.9) and 30.4 months (95% CI, 24.5-36.3), respectively (p <0.001)(Figure 1B).Final Cox regression model showed that age 65 ~ 74 (HR=1.77, 95%CI, 1.24-2.51, p=0.001), age ≥75 (HR=2.46, 95%CI, 1.69-3.58, p < 0.001), LDH≥247 U/L (HR =1.65, 95%CI, 1.07-2.51, p=0.023), ISS stage III (HR=1.76, 95%CI, 1.24-2.50, p=0.002), LMR≤2.95 (HR=1.53, 95%CI, 1.08-2.18, p=0.017), 1 HRA (HR=1.87, 95%CI, 1.27-2.75, p=0.002) and ≥2 HRA (HR=3.48, 95%CI, 2.22-5.45, p<0.001) are independent adverse prognostic factors for OS. Then weighted risk factors were summed to establish a comprehensive prognosis model, with a total score range of 0-6 points. Accordingly, the whole cohort was divided into low risk (0-1 points, 45.4%), intermediate risk (2 points, 27.9%), high risk (3 points, 19.2%) and ultra-high risk (4-6 points, 7.5 %) groups. The median OS of the four risk groups were 85.8 months (67.1-104.5), 49.0 months (44.7-53.3), 35.4 months (31.3-39.5), and 23.2 months (18.8-27.6), respectively (p<0.001). The C-statistics of this prognostic model is 0.68 (95% CI, 0.64-0.71), which is significantly better than the D-S stage (C-statistics = 0.52, 95% CI, 0.50-0.55, p <0.001), ISS (C-statistics = 0.60, 95% CI, 0.57-0.64, p <0.001) and R-ISS stage (C-statistics = 0.60, 95% CI, 0.57-0.63, p <0.001). Bootstrap resampling and calibration curve showed that the model has an accurate predictive effect on both short-term and long-term prognosis of patients(Figure 1C). Conclusion: In our analysis, ALC, LWR, LMR were associated with poor prognosis in NDMM patients, while NLR had no significant prognostic significance. Among the four indicators, LMR≤2.95 was the only independent prognostic factor. In NDMM patients, survival of patients with the same number of high-risk cytogenetic abnormalities were comparable with each other, regardless of whichever combination of HRA. Higher number of high-risk cytogenetic abnormalities were associated with worse prognosis. Cox multivariate analysis showed that, old age (65-74 years old, ≥75 years old), increased LDH (≥247 U/L), decreased LMR (≤2.95), ISS III, 1 HRA and ≥ 2 HRA were independent adverse prognostic factors that affect the OS of MM patients. 4. A comprehensive weighted prognostic model was established with the above factors, which was proved to effectively distinguish different prognosis of patients. Figure 1 Disclosures No relevant conflicts of interest to declare.
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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 (LAR)). The analyses yielded an estimated ‘community size’ of 17–18 individuals (excluding calves). High seasonal sighting rates (> 0.75 sightings per season) and a long mean residence time (ca. nine years) indicated year-round residency. The model best-fitting the LIR (emigration and mortality) also supported this. The social structure of dolphins was species-typical, characterized by significant dyadic associations within agesex classes (permutation test; P < 0.001), stronger associations among adult males than among adult females (LAR males > LAR females), and temporally stable associations (LAR > null LAR). Constant companions or long-lasting association models best explained adult male and female LARs. While behavioural information identified a resident community in the Riverpark, genetic and demographic information is needed to assess its appropriateness as a management unit.
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Mäkynen, J. M., J. K. Jokiniemi, E. I. Kauppinen, H. Tuomisto, and T. Routamo. "LWR aerosol experiments at victoria model containment." Journal of Aerosol Science 28 (September 1997): S715—S716. http://dx.doi.org/10.1016/s0021-8502(97)85356-6.

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COSTA, Edson Vinícius, Henrique Torres VENTURA, Elsio Antônio Pereira FIGUEIREDO, Fabyano Fonseca e. SILVA, Leonardo Siqueira GlÓRIA, Rodrigo Mezêncio GODINHO, Marcos Deon Vilela de RESENDE, and Paulo Sávio LOPES. "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 (December 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, heritability estimated in the repeatability model was lower than the mean of the estimates in the multi-trait model. The traits LWO, MW0, and MW3 presented high genetic correlation among different farrowings (0.961–0.997), while NBA, NP3, and LW3 (0.092–0.986) presented irregular values among farrowings. The corrected Akaike information criterion shows that the repeatability model is not indicated for almost all of the studied traits. These results indicate that the multi-trait model is recommended for genetic evaluation of the traits number of piglets born alive and alive at 3 week of age, litter weight and mean piglet weight at birth and 3 week of age, in different farrowings, as different traits.
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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 (December 11, 2014): 12–17. http://dx.doi.org/10.9756/sijcsea/v2i6/0207720102.

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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 (July 28, 2006): 221–44. http://dx.doi.org/10.1127/lr/17/2006/221.

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Jin, Wen-Long. "Nonstandard second-order formulation of the LWR model." Transportmetrica B: Transport Dynamics 7, no. 1 (May 16, 2019): 1338–55. http://dx.doi.org/10.1080/21680566.2019.1617803.

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Wang, Kai-Yuan, Yang Wang, Xin Jin, Jun Wei, and Yong-Jun Deng. "A new relocation recovery model for LWR fuel." Annals of Nuclear Energy 145 (September 2020): 107528. http://dx.doi.org/10.1016/j.anucene.2020.107528.

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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 (February 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 estimate the fatigue lives of these steels in LWR environments, and design fatigue curves have been developed for carbon and low-alloy steel components in LWR environments. The significance of environmental effect on the current Code design curve is evaluated.
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Dissertations / Theses on the topic "LWR modely"

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Ježková, Jitka. "Modelování dopravního toku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232180.

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Tato diplomová práce prezentuje problematiku dopravního toku a jeho modelování. Zabývá se především několika LWR modely, které následně rozebírá a hledá řešení pro počáteční úlohy. Ukazuje se, že ne pro všechny počáteční úlohy lze řešení definovat na celém prostoru, ale jen v určitém okolí počáteční křivky. Proto je dále odvozena metoda výpočtu velikosti tohoto okolí a to nejen zcela obecně, ale i pro dané modely. Teoretický rozbor LWR modelů a řešení počátečních úloh jsou demonstrovány několika příklady, které zřetelně ukazují, jak se dopravní tok simulovaný danými modely chová.
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Formánek, Martin. "Výukový model pro mechatroniku: vývoj modelu a rychlé komunikace pomocí USB." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417789.

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Táto diplomová práca sa zaoberá návrhom a realizáciou výukového modelu pre študentov mechatroniky na vysokej škole. Úvod práce sa zaoberá krátkym uvedením do problematiky používania univerzálnej sériovej zbernice a jej implementáciou pre komunikáciu s mikrokontrolérom. Druhá časť je venovaná hardwaru zariadenia, medzi čo patrí voľba vhodného motoru, návrh vhodných elektronických komponentov, návrh dosiek plošných spojov a taktiež mechanickej konštrukcie celého zariadenia. Nasleduje softwarová časť, popisujúca praktickú realizáciu komunikácie, program v mikrokontroléry, a Toolbox, ktorý umožňuje užívateľovi jednoduchú interakciu s hardwarom a to jak z Matlabu. tak zo Simulinku. Kombinácia navrhnutých hardwarových a softwarových prvkov umožňuje jednoduchú cestu k zlepšeniu vedomostí študentov v oblastiach programovania, riadenia a modelovaní sústav. Pre tieto účely je práca rozšírená o pracovný list, ktorý dopĺňa navrhnuté zariadenie o sadu experimentálnych úloh, zameraných na vybrané mechatronické problémy.
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Gasik, Kevin Richard. "COMPARISON OF LQR AND LQR-MRAC FOR LINEAR TRACTOR-TRAILER MODEL." DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2117.

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The United States trucking industry is immense. Employing over three million drivers and traveling to every city in the country. Semi-Trucks travel millions of miles each week and encompass roads that civilians travel on. These vehicles should be safe and allow efficient travel for all. Autonomous vehicles have been discussed in controls for many decades. Now fleets of autonomous vehicles are beginning their integration into society. The ability to create an autonomous system requires domain and system specific knowledge. Approaches to implement a fully autonomous vehicle have been developed using different techniques in control systems such as Kalman Filters, Neural Networks, Model Predictive Control, and Adaptive Control. However some of these control techniques require superb models, immense computing power, and terabytes of storage. One way to circumvent these issues is by the use of an adaptive control scheme. Adaptive control systems allow for an existing control system to self-tune its performance for unknown variables i.e. when an environment changes. In this thesis a LQR error state control system is derived and shown to maintain a magnitude of 15 cm of steady state error from the center-line of the road. In addition a proposed LQR-MRAC controller is used to test the robustness of a lane-keeping control system. The LQR-MRAC controller was able to improve its transient response peak error from the center-line of the road of the tractor and the trailer by 9.47 [cm] and 7.27 [cm]. The LQR-MRAC controller increased tractor steady state error by 0.4 [cm] and decreased trailer steady state error by 1 [cm]. The LQR-MRAC controller was able to outperform modern control techniques and can be used to improve the response of the tractor-trailer system to handle mass changes in its environment.
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Bergersen, Bjørnar Dolva. "Numerical Solutions of Traffic Flow on Networks : Using the LWR-Model and the Godunov Scheme." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for matematiske fag, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-25103.

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This paper shows how to create a simulationtool for traffic flow in a network using the Lighthill--Witham--Richards model and the Godunov scheme. First some basic rules about conservation laws are described and how to solve them using the method characteristics. This leads to the notion of weak solutions which can be solved by shock- and rarefractions-solutions. This is then used to describe how traffic behaves on a single road by using the LWR-model. The behavior of traffic at junctions is discussed, more specifically how to find the maximum flux through a junction when we deal with different amount of incoming and outgoing roads. The paper gives different examples of numerical solution methods to conservation laws, which gives motivation for the Godunov scheme. A numerical scheme using the LWR-model and the Godunov scheme is tested on different traffic models. The main test is a simplified model of Trondheim, Norway. The results are presented in videos, as well as graphs and tables that show the duration of the driving time through different routes of the model.
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Viswanathan, Vishnu. "Improving the dynamical model of the Moon using lunar laser ranging (LLR) and spacecraft data." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEO005/document.

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L'objectif principal de ce travail était d'améliorer le modèle dynamique de la Lune dans les éphémérides numériques INPOP et d’exploiter cette amélioration en vu d’une meilleure caractérisation de la structure interne de la Lune et d’effectuer des tests de la relativité générale. Dans un premier temps, un travail d’analyse des algorithmes nécessaires aux calculs des points normaux utilisés pour la construction des éphémérides lunaire a été effectué. Une analyse approfondie des procédures utilisées par l’équipe de Grasse montre l'impact du choix de l’algorithme sur le calcul de l'incertitude. L'importance de l'incertitude du point normal se reflète dans la méthode du moindre carré pondéré utilisée pour la construction des éphémérides. En particulier, l'absence d'un algorithme standardisé entre les différentes stations LLR introduit des biais dans l’estimation des incertitudes qu’il est important de prendre en compte. La thèse a également bénéficié d'un ensemble de données plus dense en raison des améliorations techniques et du passage de la longueur d'onde à l'infrarouge à la station de Grasse (Courde et al., 2017). Dans un second temps, afin de permettre des analyses multi-techniques combinant mesures SLR et LLR, la réduction des observations LLR a été introduite dans le logiciel de détermination d'orbites GINS du CNES. La modélisation suit les recommandations de IERS et été validée par une comparaison étape par étape avec les groupes d'analyse LLR de l’Observatoire de Paris et à Hanovre avec une précision de l’ordre de 1 mm. En outre, la correction des effets due au chargement hydrologique observé à la station Grasse a été mise en œuvre et a fait l’objet d’une première communication poster en 2016 (Mémin et al. 2016). Une version améliorée du modèle de réduction LLR a été intégrée à la dernière version distribuée du logiciel GINS par l’équipe de géodésie spatiale (GRGS) du CNES.Le modèle dynamique lunaire d’INPOP a d'abord été développé par Manche (2011). Cependant, en raison de l'absence du noyau fluide dans la version précédente (INPOP13c), les résidus obtenus après ajustement étaient au niveau de 5 cm pour la période moderne (2006). Une comparaison détaillée des équations dynamiques avec les éphémérides JPL DE430 a permis d'identifier les changements requis dans INPOP pour l'activation du noyau liquide lunaire. D'autres modifications ont permis l'utilisation d'un champ de gravité lunaire déterminé par la mission spatiale GRAIL. L'utilisation d'un algorithme de moindres carrés sous contraintes a aussi été utilisé afin de maintenir les paramètres connus dans des bornes compatibles avec leurs incertitudes. La nouvelle éphéméride (INPOP17a) produit un résidu de 1,4 à 1,8 cm, compatible avec (Folkner et al. 2014) et (Pavlov et al. 2016). INPOP17a est distribuée sur le site de l’imcce (www.imcce.fr/inpop) et une documentation a été publiée (Viswanathan et al. 2017) dans les notes scientifiques de l’imcce.En outre, en fournissant des contraintes plus sévères dans le modèle dynamique sur le champ de gravité lunaire à partir de l'analyse des données GRAIL, une signature caractéristique de libration lunaire avec une période de 6 ans a été révélée avec une amplitude de +/- 5 mm. Plusieurs pistes ont été étudiées pour l'identification de cet effet, impliquant des termes de marée et des composants de couple à plus haut degré. Cela reste encore un travail en cours, qui se poursuivra grâce à un contrat postdoctoral à Paris. Une publication est en cours de révision à ce sujet.Les résidus au niveau d'un centimètre permettent des tests précis du principe d'équivalence dans le système solaire. La valeur ajustée du paramètre caractérisant l'accélération différentielle de la Terre et de la Lune vers le Soleil a été obtenue et les résultats sont conformes aux travaux antérieurs (Williams et al 2012, Hofmann et al. 2016). Une interprétation en terme de théorie du dilaton est proposée. Une publication est en cours de finalisation
The main goal of the Ph.D. thesis of Vishnu Viswanathan was to improve the dynamical model of the Moon within the numerically integrated ephemeris (INPOP) and to derive results of scientific value from this improvement through the characterization of the lunar internal structure and tests of general relativity.At first, raw binaries of LLR echoes obtained from the Grasse ILRS station was used to analyze the algorithm used by the facility, for the computation of a normal point from the full-rate data. Further analysis shows the dependence of the algorithm on the reported uncertainty contained within the distributed LLR normal points from Grasse. The importance of the normal point uncertainty is reflected in the weighted least square procedure used for parameter estimation, especially in the absence of a standardized algorithm between different LLR ground stations. The thesis also benefitted in terms of a more dense dataset due to technical improvements and the switch of operational wavelength to infrared at the Grasse LLR facility (Courde et al. 2017).The reduction of the LLR observations was carried out on GINS orbit determination software from CNES. The modeling follows the IERS 2010 recommendations for the correction of all known effects on the light-time computation. The subroutines were verified through a step by step comparison study using simulated data, with LLR analysis groups in Paris and Hannover, maintaining any discrepancies in the Earth-Moon distance below 1mm. Additionally, correction of effects due to hydrological loading observed at the Grasse station has been implemented. An improved version of the LLR reduction model was submitted to the space geodesy team of CNES (GRGS).The lunar dynamical model of INPOP was first developed by Manche (2011). However, due to the absence of the fluid core within the previous version of INPOP (13c), the residuals obtained after a least-square fit were in the level of 5cm for the modern day period (2006 onwards). A detailed comparison of the dynamical equations with DE430 JPL ephemeris helped to identify required changes within INPOP for the activation of the lunar fluid core. Other modifications allowed the use of a spacecraft determined lunar gravity field within the dynamical model. The use of a bounded value least square algorithm during the regression procedure accounted for variability to well-known parameters from their reported uncertainties. The resulting iteratively fit solution of INPOP ephemeris then produces a residual of 1.4-1.8 cm, on par with that reported by Folkner et al. 2014 and Pavlov et al. 2016. The new INPOP ephemeris (INPOP17a) is distributed through the IMCCE website (www.imcce.fr/inpop) with a published documentation (Viswanathan et al. 2017) in the scientific notes of IMCCE.Furthermore, on providing tighter constraints on the lunar gravity field from GRAIL-data analysis within the dynamical model, a characteristic lunar libration signature with a period of 6 years was revealed with an amplitude of +/- 5mm. Several tracks were investigated for the identification of the unmodelled effect, involving higher degree tidal terms and torque components. This remains as a work in progress, which will be continued through a postdoctoral contract in Paris. A publication is under revision on this subject.Residuals at the level of a centimeter allow precision tests of the principle of equivalence in the solar system. The fitted value of the parameter characterizing the differential acceleration of the Earth and the Moon towards the Sun was obtained with numerically integrated partial derivatives. The results are consistent with the previous work by Williams et al (2009, 2012), and Hofmann et al. (2010, 2016). An article on this work is in preparation
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Krampoťák, Štefan. "Model dopravních situací." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219706.

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This master thesis deals with analyze of camera system in real traffic, using these system and realization of traffic situation model. Result of this work is fully functional model of traffic situation, which shows the capability of these camera systems in real traffic. It consists of two basic parts, the first is physical model of traffic with semaphore and second part is control program with algorithm for detection of traffic offences. The system contains speed measurement and red light violation. Model has capable of control the speed of cars, control semaphores and configure cameras.
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Sardinha, Anna Luiza Barszczak. "Contribuição para um modelo de circulação do LCR na cabeça." Master's thesis, FCT - UNL, 2008. http://hdl.handle.net/10362/2292.

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Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do Grau de Mestre em Engenharia Biomédica
A circulação do líquido cefaloraquidiano (LCR) é de extrema importância para a compreensão de patologias importantes como a Hidrocefalia de Pressão Normal(HPN), que é causada por um desequilíbrio entre a produção e a absorção do LCR. É portanto fundamental o desenvolvimento de um modelo que abranja todo o sistema do LCR de maneira a melhorar o conhecimento do sistema e permitir tratamentos mais eficazes. A quantificação de parâmetros de fluxo de LCR medidos no aqueduto de Sylvius tem sido utilizada para indicar se o paciente sofre de HPN. Há quem defenda que valores de fluxo total (FT) superiores a 18 ml/min indicam HPN, há quem defenda que valores de volume bidireccional médio (VBM) superiores a 42 μl justificam a terapia por derivação ventricular, levando a potenciais diagnósticos contraditórios. Neste estudo pretendemos contribuir para um modelo de circulação do LCR acrescentando dados obtidos na charneira da base do crânio, para estudarmos a dinâmica de circulação no interior da caixa craniana. Como se assume que o LCR seja produzido principalmente no plexo coroideu dos ventrículos laterais e absorvido nas granulações aracnoideias, podemos verificar a quantidade de LCR que flui dentro do cérebro entre o terceiro e quarto ventrículos, no aqueduto de Sylvius, e a quantidade de LCR que flui para o espaço subaracnoideu craniano e raquidiano na charneira da base do crânio, verificando o comportamento dinâmico dos parâmetros de circulação e da onda de propagação de fluxo, controlada pelo fluxo sanguíneo que entra no crânio. Estes exames quantitativos foram obtidos com a técnica de contraste de fase, PC-MRI por Ressonância Magnética que permite uma quantificação do fluxo durante um ciclo cardíaco in vivo e sem perturbação do sistema. Verificamos que tanto o VBM como o FT diminuem com o aumento do ritmo cardíaco, diminuindo mais drasticamente o VBM do que o FT e que o pico da sistole e da diástole se aproximam com esse aumento cardíaco. Foram feitas duas medições em regiões de interesse diferentes para a charneira da base do crânio devido à dificuldade de rodear o espaço subaracnoideu exteriormente e interiormente. O resultado para a medição em redor do espaço subaracnoideu mostrou-se mais concordante com os valores adquiridos no aqueduto de Sylvius. Verificamos também que os parâmetros de circulação estão correlacionados com a área do aqueduto de Sylvius, necessitando esta relação de ser mais aprofundada em estudos futuros.
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Kouri, Drew P. "A Nonlinear Response Model for Single Nucleotide Polymorphism Detection Assays." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1212598582.

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Ramos, Jerónima Isidora Rosado Alexandrino. "Compreender para ler. Ler para compreender: contributo de estratégias metacognitivas monitorizadas de forma directa e explicita no ensino da compreensão leitora." Master's thesis, Universidade de Évora, 2004. http://hdl.handle.net/10174/15047.

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A sociedade dos nossos dias exige dos cidadãos um elevado potencial cognitivo e metacognitivo, do qual a realidade escolar se deve aproximar, estimulando o desenvolvimento das necessárias competências e atitudes. Este estudo centra-se no processo de ensino/aprendizagem da compreensão leitora e procura investigar até que ponto uma abordagem de incidência metacognitiva, mediante estratégias monitorizadas de forma explícita e directa promovem nos alunos uma aprendizagem mais significativa, tornando-os leitores mais eficazes em termos de compreensão. O corpo do trabalho é constituído por duas componentes diferenciadas, mas que interagem em busca da necessária complementaridade: - uma componente teórica que procura reunir os conceitos fundamentais que as vertentes epistemológica, psicológica, pedagógica e metodológica integram, no sentido de conferir ao ensino/aprendizagem da compreensão leitora a coerência e a qualidade tão reclamadas; - uma componente empírica que visa investigar no campo, em contexto educativo, os princípios e referenciais teóricos; esta componente foi desenvolvida na Escola Básica 1 da Vista Alegre de Évora, com os alunos de uma turma do 2° ano de escolaridade e no âmbito da disciplina da Língua Portuguesa (compreensão leitora). Na tentativa de obter um conhecimento mais profundo do complexo fenómeno que é a educação recorreu-se, nesta investigação, ao contributo complementar dos procedimentos quantitativo e qualitativo (registos recolhidos ao longo da intervenção). Na vertente quantitativa, optou-se por um desenho quasi - experimental com grupo de controlo não equivalente. O desenho empírico envolveu uma turma e a professora – investigadora. Dois grupos funcionaram como grupos experimentais e um como grupo de controlo. Os resultados obtidos apontam para alguma vantagem final para os grupos experimentais, no que respeita à mudança no domínio em estudo: compreensão / leitora. Os dados obtidos apontam para que a compreensão leitora possa ser "ensinada" e "aprendida" através de práticas como as levadas a cabo durante o período da intervenção desta investigação. De facto a comparação e análise dos resultados dos pré e pós testes apontam para ganhos significativos dos sujeitos dos grupos E1 e E2 relativamente ao grupo de controlo. O desenvolvimento de estratégias e procedimentos de tratamento da informação parece ser um resultado das práticas seleccionadas para o processo de intervenção contemplado neste estudo. Finalmente, da análise de dados colhidos não nos parece poder destacar em relação a outros, nenhum dos habituais processos de tratamento de informação. /*** Abstract - Our society demands from all citizens a high cognitive and metacognitive potential, to which school reality must contribute by stimulating and enhancing the development of the necessary abilities and. attitudes. This study is centered in the process of reading comprehension and trios to investigate how far tasks of metacognitive incident organized in strategies explicitly and directly monitorized promote more significant comprehension processes in. reading. The body of the work is shaped in two different components, which interact searching the necessary complementarities: one is the theoretical framework in which we try to congregate the fundamental concepts which shape the epistemological, psychological, pedagogical and methodological sources interacting in reading comprehension education to provide it with the necessary coherence and quality; the other is the empiricist component which aims to display a research apparatus necessary to verify some of the assumptions placed on the theoretical field. This second component was developed in. Basic School 1 da Vista Alegre in. Évora. The subjects were 21 2 nd year students. This study was planned as experimental, having the independent variable - reading comprehension - manipulated so as to introduce differences between a control group and two experimental groups. The groups were made equivalent by random allocation. Dependent variable was manipulated by means of a period of intervention with experimental groups, in which comprehension strategies were taught. Changes in the dependent variable were detected by use of pre-test and post-test. Differences between groups in scores on the post-test were compared using an analysis of variance. Aiming to get a deeper knowledge of the complex educational phenomena, qualitative procedures were used too. Some final advantage for the experimental groups demonstrates that reading comprehension can be taught in class and learned by 2nd year students. The results rule out the possibility of identifying the best procedures in reading comprehension instruction Changes in the dependent variable were detected by use of pre-test and posttest. Differences between groups in scores on the post-test were compared using an analysis of variance. Aiming to get a deeper knowledge of the complex educational phenomena, qualitative procedures were used too. Some final advantage for the experimental groups demonstrates that reading comprehension can be taught in class and learned by 2nd year students. The results rule out the possibility of identifying the best procedures in reading comprehension instruction.
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Dadashzadeh, Aidin. "Simulation model to evaluate control of balance in humanoid robots." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-246114.

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This thesis focuses on implementing a program, using Python and the symbolic package SymPy, to evaluate balancing of a humanoid robot modelled as inverted pendulums. The balancing algorithm used to evaluate the program is the feedback controller LQR. The program has successfully implemented a working LQR algorithm together with features such as underactuation and a tilting plane as disturbance. We have shown that the energy is conserved for the falling pendulums and that it is possible to predict the behavior for certain parameter values of the pendulums, thus confirming that the program is working correctly. Furthermore we have shown that a fully-actuated system is more controllable than an under-actuated system, and for each actuator that is removed, the system becomes less controllable. Finally we discuss the program performance where some concern is given toward the seemingly poor execution time of the program. The program has been tested for up to five pendulums with successful results. Most of the results however, are revolving around three pendulum systems.
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Books on the topic "LWR modely"

1

Banks, H. Thomas. Approximation methods for control of acoustic/structure models with piezoceramic actuators. Hampton, Va: Institute for Computer Applications in Science and Engineering, 1991.

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Lucile, Bas, Hilbring Meike, Rey Francine, Öğdül Rahmi, and Özgüner Işıl, eds. Gettyimages 1910'lar: Fotoğraflarla 20. yüzyılın sosyal tarihi = Decades of the 20th century = Decennies du XX siecle. İstanbul: Literatür Yayıncılık, 2005.

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Nascimento, Aires Augusto. Ler contra o tempo: Condições dos textos na cultura portuguesa (recolha de estudos em Hora de Vésperas). Lisboa: Centro de Estudos Clássicos, 2012.

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Effective Classroom Management: Models and Strategies for Today's Classrooms. Prentice Hall, 2003.

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Hardin, Carlette J. Effective Classroom Management: Models and Strategies for Today's Classrooms. Prentice Hall, 2003.

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Manning, M. Lee, and Katherine T. Bucher. Classroom Management: Models, Applications, and Cases. Prentice Hall, 2002.

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Manning, M. Lee, and Katherine T. Bucher. Classroom Management: Models, Applications, and Cases. Prentice Hall, 2002.

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Hardin, Carlette J. Effective Classroom Management: Models and Strategies for Today's Classrooms (2nd Edition). 2nd ed. Prentice Hall, 2007.

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Chin, Wilson C. Electromagnetic Well Logging: Models for MWD / LWD Interpretation and Tool Design. Wiley & Sons, Incorporated, John, 2014.

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Chin, Wilson C. Electromagnetic Well Logging: Models for MWD / LWD Interpretation and Tool Design. Wiley-Scrivener, 2014.

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Book chapters on the topic "LWR modely"

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Garavello, Mauro, and Benedetto Piccoli. "A Multibuffer Model for LWR Road Networks." In Complex Networks and Dynamic Systems, 143–61. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6243-9_6.

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Ludovic, L., C. Estelle, and L. Jorge. "The Lagrangian Coordinates Applied to the LWR Model." In Hyperbolic Problems: Theory, Numerics, Applications, 671–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75712-2_67.

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Jingbo, Wang, Qian Li, and Wang Jingtao. "Study of Dynamic Traffic Flow Network Model Based on LWR Model." In Communications in Computer and Information Science, 562–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34038-3_77.

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Leclercq, Ludovic, and Jorge A. Laval. "A Multiclass Car-Following Rule Based on the LWR Model." In Traffic and Granular Flow ’07, 151–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-77074-9_13.

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Kita, Kenji, Takeshi Kawabata, and Hiroaki Saito. "GLR Parsing in Hidden Markov Model." In Generalized LR Parsing, 153–64. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-4034-2_11.

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Forcadel, Nicolas, and Mamdouh Zaydan. "Derivation of a Macroscopic LWR Model from a Microscopic follow-the-leader Model by Homogenization." In IFIP Advances in Information and Communication Technology, 272–81. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-55795-3_25.

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Flynn, Robin J. "CD95 and the MRL-lpr Mouse Model." In Methods in Molecular Biology, 219–28. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-6780-3_21.

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Chen, Jianzhong, Zhongke Shi, and Yanmei Hu. "Numerical Solution of a Two-Class LWR Traffic Flow Model by High-Resolution Central-Upwind Scheme." In Computational Science – ICCS 2007, 17–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-72584-8_3.

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Guthier, C. V., K. P. Aschenbrenner, F. Wenz, and J. W. Hesser. "Compressed Sensing-Based LDR Brachytherapy Inverse Treatment Planning with Biological Models." In IFMBE Proceedings, 421–24. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19387-8_102.

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Agrawal, Shweta, Daniel Wichs, and Shota Yamada. "Optimal Broadcast Encryption from LWE and Pairings in the Standard Model." In Theory of Cryptography, 149–78. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-64375-1_6.

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Conference papers on the topic "LWR modely"

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Quéau, Lucile M., Mehrdad Kimiaei, and Mark F. Randolph. "Lazy Wave Catenary Risers: Scaling Factors and Analytical Approximation of the Static Stress Range in the Touchdown Zone." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10273.

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Offshore exploration and production of oil and gas continue to increase and move into ever deeper water. Steel catenary risers (SCRs) are one of the most cost effective type of risers in deep water. However, high sensitivity to vessel motions and hydrodynamic loading in the touchdown zone may limit the feasibility of SCR applications. In recent years, there has been a growing interest in the use of Lazy-wave catenary riser (LWR) due to their better fatigue performance in the touchdown zone through the damping effect of the buoyancy section. The design of LWR involves numerous parameters that lead to a wide range of configurations. Each of these configurations needs to be evaluated against several criteria with respect to geometry, strength and fatigue for instance. This paper presents how tools recently proposed to improve the design of standard SCRs can be extended to benefit LWR applications. The dimensionless groups governing the structural response of LWRs are established in the aim of easing sensitivity analysis to key input parameters for LWR design, assisting experiments and reducing the number of numerical simulations. Moreover, the DAF (dynamic amplification factor) approach for dynamic response which has previously been explored for SCRs could also be used to simplify design of LWRs. As DAF relies on the analytical determination of static response, this framework shows that analytical boundary layer solutions in conjunction with the use of a Winkler type soil model can efficiently and accurately predict the static stress range of LWRs observed in the TDZ.
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Brown, Jesse, Yuping He, and Haoxiang Lang. "Modeling and Control Design for Active Trailer Steering of Heavy Vehicles." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70917.

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This paper presents a linear quadratic regulator (LQR) controller for active trailer steering (ATS) of a tractor-semitrailer. The tractor-semitrailer is modelled as a linear yaw/roll model with 5 Degrees-Of-Freedom (DOF). The linear yaw/roll model is validated with a nonlinear tractor-semitrailer model developed with TruckSim under a simulated single lane-change maneuver. Then, the validated linear yaw/roll model is used to design the LQR controller for ATS. The TruckSim model and the LQR controller are integrated by means of an interface between the software packages of TruckSim and Matlab/Simulink. The LQR controller is assessed using numerical simulation of the TruckSim model with and without the ATS control. Evaluation of the controller is based on the performance measures of the trailer in terms of rearward amplification (RA), peak roll angle, and load transfer ratio (LTR). It is demonstrated that the LQR controller leads to the decrease the peak values of the aforementioned measures by 4.81%, 20.7%, and 33%, respectively.
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Humphries, Larry, Brad Beeny, David Louie, Hossein Esmaili, and Michael Salay. "Non-LWR Model Development for the MELCOR Code." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-82415.

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MELCOR is a fully-integrated, system-level computer code developed by Sandia National Laboratories (SNL) for the Nuclear Regulatory Commission (NRC) with the primary objective of modeling the progression of severe accidents in light water nuclear power plants [1,2,3]. Since the project began in 1982, MELCOR has undergone continuous development to address emerging issues, process new experimental information, and create a repository of knowledge on severe accident phenomena. This paper summarizes model development specifically developed for non-LWR applications such as high temperature gas reactors (HTGR), sodium fast reactors (SFR) and molten salt reactors (MSR). Beginning in 2008, active development work began on HTGR modeling in MELCOR. Models were developed for helium gas thermodynamics, oxidation of graphite, thermal hydraulics and heat transfer for both prismatic and pebble bed designs, cavity cooling systems, fuel failure and fission product release, graphite dust generation, and aerosol transport, deposition, and resuspension. In 2013, work commenced on the development of modeling capabilities for sodium fast reactors. This development included the addition of sodium as a working fluid as well as the addition of models for simulating containment fires (both spray and pool) as well as sodium atmospheric chemistry. Validation of these new models has been completed and code-to-code comparisons with the CONTAIN/LMR code has been performed. Work continues as development of sodium concrete interaction models is now underway. In 2017, work began on adding capabilities for molten salt reactors. A new equation of state for FLIBE coolant has been successfully tested in MELCOR and is now undergoing validation against experiments. The alternate working fluid model has also been extended to permit both water and one alternate condensable working fluid in the same input model.
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Matthews, Dale E., Ralph S. Hill, and Charles W. Bruny. "2025 Nuclear Code: The Vision for the Future of ASME Nuclear Codes and Standards." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84031.

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ASME Nuclear Codes and Standards are used worldwide in the construction, inspection, and repair of commercial nuclear power plants. As the industry looks to the future of nuclear power and some of the new plant designs under development, there will be some significant departures from the current light water reactor (LWR) technology. Some examples are gas-cooled and liquid metal-cooled high temperature reactors (HTRs), small modular reactors (SMRs), and fusion energy devices that are currently under development. Many of these designs will have different safety challenges from the current LWR fleet. Variations of the current LWR technology are also expected to remain in use for the foreseeable future. Worldwide, many LWRs are planned or are already under construction. However, technology for construction of these plants has advanced considerably since most of the current construction codes were written. As a result, many modern design and fabrication methods available today, which provide both safety and economic benefits, cannot be fully utilized since they are not addressed by Code rules. For ASME Nuclear Codes and Standards to maintain and enhance their position as the worldwide leader in the nuclear power industry, they will need to be modernized to address these items. Accordingly, the ASME Nuclear Codes and Standards organizations have initiated the “2025 Nuclear Code” initiative. The purpose of this initiative is to modernize all aspects of ASME’s Nuclear Codes and Standards to adopt new technologies in plant design, construction, and life cycle management. Examples include modernized finite element analysis and fatigue rules, and incorporation of probabilistic and risk-informed methodology. This paper will present the vision for the 2025 ASME Nuclear Codes and Standards and will discuss some of the key elements that are being considered.
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Brinton, Samuel, and Akira Tokuhiro. "An Initial Study on Modeling the United States Thermal Fuel Cycle Mass Flow Using Vensim." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48571.

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According to current forecasts, nuclear power plant construction and nuclear-generated electricity production is projected to increase in the next half-century. This is likely due to the fact that nuclear energy is an ‘environmental alternative’ to fossil fuel plants that emit greenhouse gases (GHG). Nuclear power also has a much higher energy density output than other alternative energy sources such as solar, wind, and biomass energies. There is also growing consensus that processing of low- and high-level waste, LLW and HLW respectively, is a political issue rather than a technical challenge. Prudent implementation of a closed fuel cycle not only curbs build-up of GHGs, but can equally mitigate the need to store nuclear used fuel. The Global Nuclear Energy Partnership (GNEP) is promoting gradual integration of fuel reprocessing, and deployment of fast reactors (FRs) into the global fleet for long-term uranium resource usage. The use of mixed oxide (MOX) fuel burning Light Water Reactors (LWR) has also been suggested by fuel cycle researchers. This study concentrated on modeling the construction and decommissioning rates of six major facilities comprising the nuclear fuel cycle, as follows: (1) current LWRs decommissioned at 60-years service life, (2) new LWRs burning MOX fuel, (3) new (Gen’ III+) LWRs to replace units and/or be added to the fleet, (4) new FRs to be added to the fleet, (5) new reprocessing and MOX fuel fabrication facilities and (6) new LWR fuel fabrication facilities. Our initial work [1] focused on modeling the construction and decommissioning rates of reactors to be deployed. This is being followed with a ‘mass flow model’, starting from uranium ore and following it to spent forms. The visual dynamic modeling program Vensim was used to create a system of equations and variables to track the mass flows from enrichment, fabrication, burn-up, and the back-end of the fuel cycle. Sensible construction and deployment rates were benchmarked against recent reports and then plausible scenarios considered parametrically. The timeline starts in 2007 and extends in a preliminary model to 2057; a further mass flow model scenario continues until 2107. The scenarios considered provide estimates of the uranium ore requirements, quantities of LLW and HLW production, and waste storage volume needs. The results of this study suggest the number of reprocessing facilities necessary to stabilize and/or reduce recently reported levels of spent fuel inventory. Preliminary results indicate that the entire national spent fuel inventory produced over the next ∼50 years can be reprocessed by a reprocessing plant construction rate of less than 0.07 plants/year (small capacity) or less than 0.05 plants /year (large capacity). Any larger construction rate could reduce the spent fuel inventory destined for storage. These and additional results will be presented.
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Chen, Jianzhong, Zhongke Shi, and Yanmei Hu. "Numerical Simulation of a Multi-Class LWR Traffic Flow Model." In 2009 Second International Conference on Intelligent Computation Technology and Automation. IEEE, 2009. http://dx.doi.org/10.1109/icicta.2009.270.

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Li, Xin, and Huapu Lu. "An Extension of LWR Model Considering Slope and Heterogeneous Drivers." In 2010 International Conference on Computational and Information Sciences (ICCIS). IEEE, 2010. http://dx.doi.org/10.1109/iccis.2010.305.

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Mao, Lisheng, Minghuang Wang, Xuewei Fu, Jieqiong Jiang, and Yican Wu. "Preliminary Fuel Cycle Analysis of a Fusion-Driven Subcritical Reactor." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-15588.

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The levelized cost of electricity (LCOE) has been performed to compare two fuel cycle scenarios: a once-through cycle (LWR OT) and a fusion Cdriven reactor, namely FDS-SFB, recycling employing PUREX (Purex-SFB). In order to estimate the LCOEs, the mass flows based on an equilibrium mode were analysed. The sensitivity of the results to variations in key parameters was also performed. A simple dynamic model was also constructed to consider other important factors that characterize a fuel cycle, e.g. resource utilization, environmental effects. The results of economics are as flows: LWR OT 29mills/KWh, Purex-SFB 48.19mills/KWh. It was found that the capital cost accounts for the largest proportion of the LCOEs. The fuel cycle cost analysis indicates that the FDS-SFB fuel cycle cost will be competitive with the once-through fuel cycle. Also, sensitivity analysis indicates that fuel cycle cost of LWR would be higher than that of the LWR-SFB fuel cycle with the uranium Price rising. Dynamic model analysis indicates that Purex-SFB could reduce the amounts of MA and the amounts of natural uranium considerably compared with LWR OT.
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Eason, Ernest, and Raj Pathania. "Crack Tip Strain Rate Models for Environmentally-Assisted Fatigue Crack Growth in Light Water Reactor Environments." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63640.

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This paper demonstrates the feasibility of using theoretically-motivated crack tip strain rate (CTSR) models to estimate environmentally-assisted fatigue (EAF) crack growth rate (CGR) in light water reactor (LWR) environments. Four models, each combining one of two CTSR expressions with one of two theoretical derivations from Faraday’s Law, were fitted to measured CGR data under dynamic loadings. The four models were compared with each other and with experimental crack growth data from examples where various austenitic stainless steel base metals and nickel-alloy welds were tested in LWR environments under EAF, periodic partial unloading (PPU) with various hold times, loading gradients with increasing and decreasing stress intensity factor K (±dK/da), and constant K loading. All four models produced good fits to the data on some examples, and the models using the newer derivation performed well on all examples. Default model parameters and an equation for the distance from the crack tip at which strain rate is estimated were successful in simplifying the application of the models. Both variable effects and measured CGR were well modeled. Advantages and issues of theoretically-based CTSR models are presented.
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Li, Wenjie, Yongjun Jiao, and Bingde Chen. "Development of Plenum Temperature Model for Accident Analysis." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60330.

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Plenum temperature is an important parameter in the calculation of LWR fuel rod internal pressure, since plenum contributes over 40% of free volume in typical LWR fuel design. In many fuel performance codes the plenum temperature are determined in a simple and empirical method. There is a concern about whether such a simple method can properly reflect the temperature variation during fast transients and accident conditions. Therefore, a detailed simulation of heat transfer process in plenum based on COMSOL Multiphysics software was performed to give a fine resolution of temperature and to investigate the heat transfer mechanisms. Since the COMSOL application is a stand-alone model, a new plenum temperature model which can be coupled with fuel performance code was also developed. Finally the validation of the new plenum temperature model is performed by comparing its results with COMSOL model and FUPAC code.
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Reports on the topic "LWR modely"

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Spencer, B. W., and R. J. Gardener. Improved LWR Fuel Rod Mechanics Models. Office of Scientific and Technical Information (OSTI), February 2018. http://dx.doi.org/10.2172/1467423.

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Odette, G. Robert, and Takuya Yamamoto. Advanced Models of LWR Pressure Vessel Embrittlement for Low Flux-HighFluence Conditions. Office of Scientific and Technical Information (OSTI), June 2013. http://dx.doi.org/10.2172/1084639.

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Simunovic, Srdjan, Theodore M. Besmann, and Stewart L. Voit. Benchmark Problem for Calculating Oxygen Potential in High Burnup LWR Fuel using the THERMOCHIMICA Module in Moose/Bison. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1163165.

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4

Wadman, Heidi, and Jesse McNinch. Elevation of underlying basement rock, Ogdensburg Harbor, NY. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/40843.

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Abstract:
Over six linear miles of shallow acoustic reflection geophysical data were collected in an 800 ft by 300 ft survey region at Ogdensburg Harbor, Ogdensburg, NY. To better accommodate modern commercial vessels and expand the harbor’s capacity, the current navigable depth of -19 ft Low Water Depth (LWD) needs to be increased to -28 ft LWD, and an accurate map of the nature of the riverbed material (e.g., unconsolidated sediment, partially indurated glacial till, or bedrock) is required to effectively plan for removal. A total of 28 boreholes were previously collected to map the stratigraphy, and the effort revealed significant spatial variability in unit thickness and elevation between adjacent boreholes. To accurately map this variable stratigraphy, chirp sub-bottom profiles were collected throughout the region, with an average line spacing of 13 ft. These sub-bottom data, validated and augmented by the borehole data, resulted in high-resolution spatial maps of stratigraphic elevation and thickness for the study area. The data will allow for more accurate assessment of the type and extent of different dredging efforts required to achieve a future uniform depth of -28 ft LWD for the navigable region.
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Odette, G. Robert. High Fluency Low Flux Embrittlement Models of LWR Reactor Pressure Vessel Embrittlement and a Supporting Database from the UCSB ATR-2 Irradiation Experiment. Office of Scientific and Technical Information (OSTI), January 2017. http://dx.doi.org/10.2172/1346148.

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Heasler, Patrick G. Development of a Random Field Model for Gas Plume Detection in Multiple LWIR Images. Office of Scientific and Technical Information (OSTI), September 2008. http://dx.doi.org/10.2172/1133250.

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Weber, M., G. Tartakovsky, C. Farrow, J. Fullerton, J. McDonald, and William Nichols. Vadose Zone Model for LW Crib Area for Composite Analysis. Office of Scientific and Technical Information (OSTI), September 2020. http://dx.doi.org/10.2172/1668816.

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8

Garavaglia, T., and K. Kauffmann. A model for local current decay in a superconducting LR chain. Office of Scientific and Technical Information (OSTI), April 1991. http://dx.doi.org/10.2172/79106.

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Zeisse, C. R. Relative Spectral Responsivity of Two AGEMA Infrared Scanning Cameras. Models 900 SW/ST and 900 LW/ST. Fort Belvoir, VA: Defense Technical Information Center, May 1995. http://dx.doi.org/10.21236/ada302783.

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Van Tuyle, G. J., G. C. Slovik, B. C. Chan, R. J. Kennett, H. S. Cheng, and P. G. Kroeger. Summary of advanced LMR (Liquid Metal Reactor) evaluations: PRISM (Power Reactor Inherently Safe Module) and SAFR (Sodium Advanced Fast Reactor). Office of Scientific and Technical Information (OSTI), October 1989. http://dx.doi.org/10.2172/5491968.

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