Academic literature on the topic 'MITgcm model'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'MITgcm model.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "MITgcm model"
1
Völpel, Rike, André Paul, Annegret Krandick, Stefan Mulitza, and Michael Schulz. "Stable water isotopes in the MITgcm." Geoscientific Model Development 10, no. 8 (August 25, 2017): 3125–44. http://dx.doi.org/10.5194/gmd-10-3125-2017.
Full textAbstract:
Abstract. We present the first results of the implementation of stable water isotopes in the Massachusetts Institute of Technology general circulation model (MITgcm). The model is forced with the isotopic content of precipitation and water vapor from an atmospheric general circulation model (NCAR IsoCAM), while the fractionation during evaporation is treated explicitly in the MITgcm. Results of the equilibrium simulation under pre-industrial conditions are compared to observational data and measurements of plankton tow records (the oxygen isotopic composition of planktic foraminiferal calcite). The broad patterns and magnitude of the stable water isotopes in annual mean seawater are well captured in the model, both at the sea surface as well as in the deep ocean. However, the surface water in the Arctic Ocean is not depleted enough, due to the absence of highly depleted precipitation and snowfall. A model–data mismatch is also recognizable in the isotopic composition of the seawater–salinity relationship in midlatitudes that is mainly caused by the coarse grid resolution. Deep-ocean characteristics of the vertical water mass distribution in the Atlantic Ocean closely resemble observational data. The reconstructed δ18Oc at the sea surface shows a good agreement with measurements. However, the model–data fit is weaker when individual species are considered and deviations are most likely attributable to the habitat depth of the foraminifera. Overall, the newly developed stable water isotope package opens wide prospects for long-term simulations in a paleoclimatic context.
2
Sun, Shantong, Ian Eisenman, Laure Zanna, and Andrew L. Stewart. "Surface Constraints on the Depth of the Atlantic Meridional Overturning Circulation: Southern Ocean versus North Atlantic." Journal of Climate 33, no. 8 (April 15, 2020): 3125–49. http://dx.doi.org/10.1175/jcli-d-19-0546.1.
Full textAbstract:
AbstractPaleoclimate proxy evidence suggests that the Atlantic meridional overturning circulation (AMOC) was about 1000 m shallower at the Last Glacial Maximum (LGM) compared to the present. Yet it remains unresolved what caused this glacial shoaling of the AMOC, and many climate models instead simulate a deeper AMOC under LGM forcing. While some studies suggest that Southern Ocean surface buoyancy forcing controls the AMOC depth, others have suggested alternatively that North Atlantic surface forcing or interior diabatic mixing plays the dominant role. To investigate the key processes that set the AMOC depth, here we carry out a number of MITgcm ocean-only simulations with surface forcing fields specified from the simulation results of three coupled climate models that span much of the range of glacial AMOC depth changes in phase 3 of the Paleoclimate Model Intercomparison Project (PMIP3). We find that the MITgcm simulations successfully reproduce the changes in AMOC depth between glacial and modern conditions simulated in these three PMIP3 models. By varying the restoring time scale in the surface forcing, we show that the AMOC depth is more strongly constrained by the surface density field than the surface buoyancy flux field. Based on these results, we propose a mechanism by which the surface density fields in the high latitudes of both hemispheres are connected to the AMOC depth. We illustrate the mechanism using MITgcm simulations with idealized surface forcing perturbations as well as an idealized conceptual geometric model. These results suggest that the AMOC depth is largely determined by the surface density fields in both the North Atlantic and the Southern Ocean.
3
Zhai, Xiaoming, Helen L. Johnson, and David P. Marshall. "A Model of Atlantic Heat Content and Sea Level Change in Response to Thermohaline Forcing." Journal of Climate 24, no. 21 (November 1, 2011): 5619–32. http://dx.doi.org/10.1175/jcli-d-10-05007.1.
Full textAbstract:
Abstract The response of ocean heat content in the Atlantic to variability in the meridional overturning circulation (MOC) at high latitudes is investigated using a reduced-gravity model and the Massachusetts Institute of Technology (MIT) general circulation model (MITgcm). Consistent with theoretical predictions, the zonal-mean heat content anomalies are confined to low latitudes when the high-latitude MOC changes rapidly, but extends to mid- and high latitudes when the high-latitude MOC varies on decadal or multidecadal time scales. This low-pass-filtering effect of the mid- and high latitudes on zonal-mean heat content anomalies, termed here the “Rossby buffer,” is shown to be associated with the ratio of Rossby wave basin-crossing time to the forcing period at high northern latitudes. Experiments using the MITgcm also reveal the importance of advective spreading of cold water in the deep ocean, which is absent in the reduced-gravity model. Implications for monitoring ocean heat content and sea level changes are discussed in the context of both models. It is found that observing global sea level variability and sea level rise using tide gauges can substantially overestimate the global-mean values.
4
Safin, Artur, Damien Bouffard, Firat Ozdemir, Cintia L. Ramón, James Runnalls, Fotis Georgatos, Camille Minaudo, and Jonas Šukys. "A Bayesian data assimilation framework for lake 3D hydrodynamic models with a physics-preserving particle filtering method using SPUX-MITgcm v1." Geoscientific Model Development 15, no. 20 (October 21, 2022): 7715–30. http://dx.doi.org/10.5194/gmd-15-7715-2022.
Full textAbstract:
Abstract. We present a Bayesian inference for a three-dimensional hydrodynamic model of Lake Geneva with stochastic weather forcing and high-frequency observational datasets. This is achieved by coupling a Bayesian inference package, SPUX, with a hydrodynamics package, MITgcm, into a single framework, SPUX-MITgcm. To mitigate uncertainty in the atmospheric forcing, we use a smoothed particle Markov chain Monte Carlo method, where the intermediate model state posteriors are resampled in accordance with their respective observational likelihoods. To improve the uncertainty quantification in the particle filter, we develop a bi-directional long short-term memory (BiLSTM) neural network to estimate lake skin temperature from a history of hydrodynamic bulk temperature predictions and atmospheric data. This study analyzes the benefit and costs of such a state-of-the-art computationally expensive calibration and assimilation method for lakes.
5
Ren, Shihe, Xi Liang, Qizhen Sun, Hao Yu, L. Bruno Tremblay, Bo Lin, Xiaoping Mai, et al. "A fully coupled Arctic sea-ice–ocean–atmosphere model (ArcIOAM v1.0) based on C-Coupler2: model description and preliminary results." Geoscientific Model Development 14, no. 2 (February 24, 2021): 1101–24. http://dx.doi.org/10.5194/gmd-14-1101-2021.
Full textAbstract:
Abstract. The Arctic regional coupled sea-ice–ocean–atmosphere model (ArcIOAM) has been developed to provide reliable Arctic sea ice prediction on seasonal timescales. The description and implementation of ArcIOAM and its preliminary results for the year of 2012 are presented in this paper. In the ArcIOAM configuration, the Community Coupler 2 (C-Coupler2) is used to couple the Arctic sea-ice–oceanic configuration of the MITgcm (Massachusetts Institute of Technology general circulation model) with the Arctic atmospheric configuration of the Polar WRF (Weather Research and Forecasting) model. A scalability test is performed to investigate the parallelization of the coupled model. As the first step toward reliable Arctic seasonal sea ice prediction, ArcIOAM, implemented with two-way coupling strategy along with one-way coupling strategy, is evaluated with respect to available observational data and reanalysis products for the year of 2012. A stand-alone MITgcm run with prescribed atmospheric forcing is performed for reference. From the comparison, all the experiments simulate reasonable evolution of sea ice and ocean states in the Arctic region over a 1-year simulation period. The two-way coupling has better performance in terms of sea ice extent, concentration, thickness and sea surface temperature (SST), especially in summer. This result indicates that sea-ice–ocean–atmosphere interaction plays a crucial role in controlling Arctic summertime sea ice distribution.
6
Cossarini, Gianpiero, Stefano Querin, Cosimo Solidoro, Gianmaria Sannino, Paolo Lazzari, Valeria Di Biagio, and Giorgio Bolzon. "Development of BFMCOUPLER (v1.0), the coupling scheme that links the MITgcm and BFM models for ocean biogeochemistry simulations." Geoscientific Model Development 10, no. 4 (April 5, 2017): 1423–45. http://dx.doi.org/10.5194/gmd-10-1423-2017.
Full textAbstract:
Abstract. In this paper, we present a coupling scheme between the Massachusetts Institute of Technology general circulation model (MITgcm) and the Biogeochemical Flux Model (BFM). The MITgcm and BFM are widely used models for geophysical fluid dynamics and for ocean biogeochemistry, respectively, and they benefit from the support of active developers and user communities. The MITgcm is a state-of-the-art general circulation model for simulating the ocean and the atmosphere. This model is fully 3-D (including the non-hydrostatic term of momentum equations) and is characterized by a finite-volume discretization and a number of additional features enabling simulations from global (O(107) m) to local scales (O(100) m). The BFM is a biogeochemical model based on plankton functional type formulations, and it simulates the cycling of a number of constituents and nutrients within marine ecosystems. The online coupling presented in this paper is based on an open-source code, and it is characterized by a modular structure. Modularity preserves the potentials of the two models, allowing for a sustainable programming effort to handle future evolutions in the two codes. We also tested specific model options and integration schemes to balance the numerical accuracy against the computational performance. The coupling scheme allows us to solve several processes that are not considered by each of the models alone, including light attenuation parameterizations along the water column, phytoplankton and detritus sinking, external inputs, and surface and bottom fluxes. Moreover, this new coupled hydrodynamic–biogeochemical model has been configured and tested against an idealized problem (a cyclonic gyre in a mid-latitude closed basin) and a realistic case study (central part of the Mediterranean Sea in 2006–2012). The numerical results consistently reproduce the interplay of hydrodynamics and biogeochemistry in both the idealized case and Mediterranean Sea experiments. The former reproduces correctly the alternation of surface bloom and deep chlorophyll maximum dynamics driven by the seasonal cycle of winter vertical mixing and summer stratification; the latter simulates the main basin-wide and mesoscale spatial features of the physical and biochemical variables in the Mediterranean, thus demonstrating the applicability of the new coupled model to a wide range of ocean biogeochemistry problems.
7
Strobach, Ehud, Andrea Molod, Donifan Barahona, Atanas Trayanov, Dimitris Menemenlis, and Gael Forget. "Earth system model parameter adjustment using a Green's functions approach." Geoscientific Model Development 15, no. 5 (March 17, 2022): 2309–24. http://dx.doi.org/10.5194/gmd-15-2309-2022.
Full textAbstract:
Abstract. We demonstrate the practicality and effectiveness of using a Green's functions estimation approach for adjusting uncertain parameters in an Earth system model (ESM). This estimation approach has previously been applied to an intermediate-complexity climate model and to individual ESM components, e.g., ocean, sea ice, or carbon cycle components. Here, the Green's functions approach is applied to a state-of-the-art ESM that comprises a global atmosphere/land configuration of the Goddard Earth Observing System (GEOS) coupled to an ocean and sea ice configuration of the Massachusetts Institute of Technology general circulation model (MITgcm). Horizontal grid spacing is approximately 110 km for GEOS and 37–110 km for MITgcm. In addition to the reference GEOS-MITgcm simulation, we carried out a series of model sensitivity experiments, in which 20 uncertain parameters are perturbed. These “control” parameters can be used to adjust sea ice, microphysics, turbulence, radiation, and surface schemes in the coupled simulation. We defined eight observational targets: sea ice fraction, net surface shortwave radiation, downward longwave radiation, near-surface temperature, sea surface temperature, sea surface salinity, and ocean temperature and salinity at 300 m. We applied the Green's functions approach to optimize the values of the 20 control parameters so as to minimize a weighted least-squares distance between the model and the eight observational targets. The new experiment with the optimized parameters resulted in a total cost reduction of 9 % relative to a simulation that had already been adjusted using other methods. The optimized experiment attained a balanced cost reduction over most of the observational targets. We also report on results from a set of sensitivity experiments that are not used in the final optimized simulation but helped explore options and guided the optimization process. These experiments include an assessment of sensitivity to the number of control parameters and to the selection of observational targets and weights in the cost function. Based on these sensitivity experiments, we selected a specific definition for the cost function. The sensitivity experiments also revealed a decreasing overall cost as the number of control variables was increased. In summary, we recommend using the Green's functions estimation approach as an additional fine-tuning step in the model development process. The method is not a replacement for modelers' experience in choosing and adjusting sensitive model parameters. Instead, it is an additional practical and effective tool for carrying out final adjustments of uncertain ESM parameters.
8
Zaporozhtsev, I. F., and D. V. Moiseev. "Simulation of spatio-temporal variability of temperature in the Taganrog Bay with MITgcm model." Vestnik MGTU 20, no. 1/2 (March 2017): 231–41. http://dx.doi.org/10.21443/1560-9278-2017-20-1/2-231-241.
Full text
9
Sraj, Ihab, Sarah E. Zedler, Omar M. Knio, Charles S. Jackson, and Ibrahim Hoteit. "Polynomial Chaos–Based Bayesian Inference of K-Profile Parameterization in a General Circulation Model of the Tropical Pacific." Monthly Weather Review 144, no. 12 (November 9, 2016): 4621–40. http://dx.doi.org/10.1175/mwr-d-15-0394.1.
Full textAbstract:
Abstract The authors present a polynomial chaos (PC)–based Bayesian inference method for quantifying the uncertainties of the K-profile parameterization (KPP) within the MIT general circulation model (MITgcm) of the tropical Pacific. The inference of the uncertain parameters is based on a Markov chain Monte Carlo (MCMC) scheme that utilizes a newly formulated test statistic taking into account the different components representing the structures of turbulent mixing on both daily and seasonal time scales in addition to the data quality, and filters for the effects of parameter perturbations over those as a result of changes in the wind. To avoid the prohibitive computational cost of integrating the MITgcm model at each MCMC iteration, a surrogate model for the test statistic using the PC method is built. Because of the noise in the model predictions, a basis-pursuit-denoising (BPDN) compressed sensing approach is employed to determine the PC coefficients of a representative surrogate model. The PC surrogate is then used to evaluate the test statistic in the MCMC step for sampling the posterior of the uncertain parameters. Results of the posteriors indicate good agreement with the default values for two parameters of the KPP model, namely the critical bulk and gradient Richardson numbers; while the posteriors of the remaining parameters were barely informative.
10
YAMAGUCHI, Kosei, Takao YAMASHITA, Han Soo LEE, and Ryota OHSHIRO. "Numerical Experiment for Typhoon and Ocean Interaction by MITgcm-MM5 Coupling Model." PROCEEDINGS OF COASTAL ENGINEERING, JSCE 54 (2007): 336–40. http://dx.doi.org/10.2208/proce1989.54.336.
Full textDissertations / Theses on the topic "MITgcm model"
1
Reale, Marco. "A process study of the Adriatic-Ionian System baroclinic dynamics." Doctoral thesis, Università degli studi di Trieste, 2015. http://hdl.handle.net/10077/11106.
Full textAbstract:
2013/2014Il sistema Adriatico Ionio è un importante componente nella circolazione termoalina del bacino orientale mediterraneo. Il mar Adriatico è la più importante sorgente di acqua profonde per il bacino. Il mar Ionio è una sorta di punto di incrocio per acque con caratteristiche diverse : le acque atlantiche in superficie , quelle levantine negli strati intermedi , le acque profonde adriatiche in quelli sul fondo . La variabilità osservata nella circolazione Ionica , con reversal periodici da stato ciclonico a stato anticiclonico e e viceversa, negli ultimi 20 anni è stata oggetto di dibattito in quanto è stata attribuita rispettivamente all'influenza della variazione delle proprietà termoaline delle acque profonde prodotte nel sud Adriatico sul bilancio di vorticità dello Ionio o a variazioni nel rotore del wind stress sul bacino ionico.Questo lavoro di tesi si prefigge di esaminare tutte le ipotesi relative alla dinamica del sistema adriatico-ionio da un punto di vista modellistico e la sua risposta in termini di bilancio di vorticità e di energia all'azione di forzanti esterne come il wind stress e i flussi termoalini. I risultati finali di questo approccio modellistico hanno mostrato la maggiore importanza del bacino est (mar cretese e passaggio di creta) rispetto all'Adriatico nel determinare la variabilità , a livello di bilancio di vorticità e di energia , della circolazione ionica .
The Adriatic-Ionian system represents an important component in the Mediterranean thermohaline circulation.The Adriatic Sea is the main source of deep waters for the Eastern Basin.The Ionian Sea is a sort of cross-road points for different kind of waters: Atlantic water moving on its surface layers , Levantine waters moving in its intermediate layers, Adriatic deep waters moving on its bottom layers.The variability observed in the Ionian upper layers circulation , which revers periodically from cyclonic to anticyclonic pattern and viceversa, in the last 20 years has been object of debate as it has been attributed to the effects of variation of thermohaline properties of deep waters produced in the Adriatic Sea on the vorticity balance of the Ionian or to variation in the wind stress curl over the Ionian basin.This thesis work aims to challenge all the hypotheses related the Adriatic-Ionian System dynamics using a modeling approach and its behavior in terms of vorticity and energy balance to some forcing as wind stress and thermohaline fluxes.The final results of this analysis have shown the predominant role , with respect to the Adriatic Sea , of Eastern basin in determining the vorticity and energy balance of the Ionian and shaping the variability of its circulation.
XXVII Ciclo
1982
2
Zaupa, Matteo. "Thermo-hydraulic models and analyses for design optimization of cooling circuits and components of SPIDER and MITICA experiments." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3426764.
Full textAbstract:
ITER is the next milestone towards the development of a controlled thermonuclear fusion reactor. Based on the tokamak concept, among the systems used to heat the plasma, the Neutral Beam Injector (NBI) plays a fundamental role. The particle energy levels up to 1 MeV, the heating power to deliver to the plasma up to 16.5 MW and the steady state condition up to 3600 s, have never been simultaneously achieved before in such kind of device. A Neutral Beam Test Facility has been realised in Padova (Italy) at Consorzio RFX in order to host two experiments (SPIDER and MITICA) and solve the scientific and technological gaps.
The research activity presented in this thesis work has been carried out in the framework of the development of the ITER full scale negative ion source (SPIDER) and of the full injector prototype for the ITER neutral beam (MITICA).
The thesis is focused on two main topics: development of thermo-hydraulic one-dimensional models with 3D sub-modelling, and customization of a finite element code for coupled 1D-3D thermo-hydraulic analyses.
Proper models of the MITICA beam source, neutraliser and residual ion dump cooling systems have been developed since they are required, in support of the design, in order to predict under steady state conditions the flow partitioning, the coolant temperatures and pressure drops in complex and delicate pipework networks; all these results are useful, as boundary conditions, for further detailed simulations oriented to the localised heat transfer coefficients. The hydraulic behaviour of the components have been simulated both with analytical models and detailed 3D computational fluid dynamics (CFD) analyses. The optimised cooling circuits have been proposed and then implemented for the construction of the MITICA components.
The coupled 1D-3D thermo-hydraulic analyses have been dedicated to the SPIDER beam dump (already procured) made of CuCrZr hypervapotrons as high heat flux elements. Suitable correlations for localised heat transfer coefficients and pressure drop for forced-convection and sub-cooled surface boiling in hypervapotron geometry have been implemented in a new customised FE code to allow coupled thermo-hydraulic analyses in two-phase heat transfer. The customized code has been used to carry out detailed simulations of the local heat transfer mechanisms occurring along the cooling channels under different particle beam scenarios (in terms of divergence, halo fraction and horizontal misalignment). A synthesis of the simulation results has been undertaken by identifying in the model the locations of the thermocouples used during operations. The analysis results characterise the thermo-hydraulic behaviour of the beam dump to be used as a possible beam diagnostic in synergy with tomography and spectroscopy.ITER costituisce la prossima tappa verso lo sviluppo di un reattore a fusione termonucleare. Basato sul concetto tokamak, utilizza diversi sistemi di riscaldamento per il plasma, tra questi sistemi l’iniettore di fascio di neutri gioca un ruolo fondamentale. Il livello di energia delle particelle fino a 1 MeV, la potenza di riscaldamento da rilasciare al plasma fino a 16.5 MW e l’operatività in condizioni stazionarie fino a 3600 s, non sono mai state simultaneamente raggiunte in macchine di questo tipo. Una Neutral Beam Test Facility è stata realizzata a Padova (Italia) presso il Consorzio RFX al fine di ospitare due esperimenti (SPIDER e MITICA) e colmare le lacune scientifiche e tecnologiche. L’attività di ricerca presentata in questo lavoro di tesi si inserisce nel contesto dello sviluppo di una sorgente a ioni negativi delle dimensioni pari a quelle richieste per ITER (SPIDER) e al prototipo di iniettore di fascio di neutri per ITER (MITICA). La tesi è focalizzata su due argomenti principali: sviluppo di modelli termo-idraulici uno-dimensionali con sotto-modelli 3D, e l’adattamento di un codice agli elementi finiti per svolgere analisi termo-idrauliche accoppiate 1D-3D. Sono stati sviluppati appropriati modelli per i circuiti di raffreddamento di MITICA beam source, neutraliser, e residual ion dump in quanto necessari, in supporto alla progettazione, al fine di predire la distribuzione delle portate, le temperature e le cadute di pressione; tali risultati risultano particolarmente utili per successive analisi dettagliate orientate al calcolo del coefficiente di scambio termico locale. Il comportamento idraulico dei componenti è stato simulato sia con modelli analitici, che attraverso simulazioni CFD dettagliate. I circuiti di raffreddamento ottimizzati sono stati adottati per la realizzazione dei componenti di MITICA. Le analisi termo-idrauliche accoppiate 1D-3D sono state svolte per il componente SPIDER beam dump costituito di hypervapotron, realizzati in lega di CuCrZr, come elementi di scambio termico. In un nuovo codice agli elementi finiti sono state implementate opportune correlazioni per il coefficiente di scambio termico locale e per la perdita di pressione in regimi di convezione forzata ed ebollizione nucleata con vena fluida sottoraffreddata. L’adattamento di tale codice ha permesso di svolgere simulazioni dei diversi meccanismi di scambio termico che si verificano lungo i canali di raffreddamento con differenti scenari di fascio (in termini di divergenza, frazione di halo e disallineamento orizzontale). Una sintesi dei risultati è stata svolta identificando nel modello la posizione delle termocoppie usate durante le operazioni. I risultati caratterizzano il comportamento termo-idraulico del beam dump come possibile diagnostica di fascio in sinergia con tomografia e spettroscopia.
3
Schirmer, Helena. "An?lise do padr?o transcricional de sirtu?nas influenciado por trans-resveratrol, etanol e restri??o cal?rica utilizando modelo de zebrafish (Danio rerio)." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2011. http://tede2.pucrs.br/tede2/handle/tede/5391.
Full textAbstract:
Made available in DSpace on 2015-04-14T14:51:06Z (GMT). No. of bitstreams: 1
431141.pdf: 13187681 bytes, checksum: 1ec3202d47e45648161456f90fa14a9e (MD5)
Previous issue date: 2011-03-23Resveratrol ? um polifenol de ocorr?ncia natural amplamente estudado na preven??o de doen?as associadas ao envelhecimento. Foi caracterizado por aumentar a longevidade em organismos menores e em roedores obesos, mecanismos relacionados a modula??o de sirtu?na 1. Desta forma, foi comparado e apresentado como um importante composto mimetizador de restri??o cal?rica, ?nica interven??o n?o gen?tica conhecida por aumentar a longevidade. Sirtu?nas compreendem uma fam?lia de enzimas NAD+ dependentes que t?m como alvo prote?nas histonas e n?o histonas, regulando uma s?rie de eventos celulares relacionados ao metabolismo. Apesar do resveratrol ter sido apresentado por modular SIRT1, este mecanismo parece ser muito mais complexo e n?o est? completamente elucidado. Neste estudo, n?s investigamos o perfil de transcri??o de SIRT1, SIRT3 e SIRT4 e genes alvos relacionados a estas enzimas, PGC1α, PPARγ e NAMPT, modulados por resveratrol, em um modelo sem inj?ria e estress; e na presen?a de um agente estressor, neste caso o etanol e; ap?s restri??o cal?rica. Para o estudo, foi utilizado zebrafish adulto tipo selvagem, por ser um modelo experimental consolidado, por?m pouco explorado quanto ao mecanismo de sirtuinas, do composto resveratrol e restri??o cal?rica. Para an?lise transcricional foi utilizado a t?cnica de RT-PCR semiquantitativo. Para determina??o do estado de acetila??o H3 lys9 foi utilizado a t?cnica de Western Blotting. As express?es de mRNA foram analisadas em f?gado de zebrafish ap?s exposi??o a diferentes tempos e concentra??es de resveratrol, etanol e, tamb?m no m?sculo, ap?s restri??o cal?rica. Em nosso modelo experimental nem o resveratrol, nem a restri??o cal?rica modularam a express?o de SIRT; por?m, n?s observamos que ambas interven??es apresentaram perfil similar na transcri??o de SIRT3 e SIRT4, diminuindo os n?veis de mRNA no f?gado. N?s sugerimos que o composto pode exercer efeitos ben?ficos similar a RC por modula??o de outras sirtu?nas que n?o SIRT1 e, estas devem ser melhor exploradas. Ainda, n?s demonstramos que resveratrol modula a express?o de sirtu?nas e outros genes analisados como NAMPT, em um modelo sem inj?ria, e esta modula??o deve ser compreendida a n?veis fisiol?gicos uma vez que o composto vem sendo utilizado como composto nutrac?utico por indiv?duos saud?veis. Etanol, aqui utilizado como um agente estressor, n?o causou dano hep?tico, principalmente nos animais que receberam tratamento cr?nico. Por?m, foi poss?vel observar que resveratrol e etanol apresentaram padr?o diferente no perfil de express?o g?nica e acetila??o de prote?na e, que a associa??o dos dois compostos reverteu aos n?veis pr?ximos do controle estas altera??es. Estes resultados consolidam o zebrafish como modelo experimental a ser utilizado na compreens?o da modula??o de sirtu?nas modulado por resveratrol e restri??o cal?rica
4
Paris, Iria. "ROBUSTESSE DES ÉLÉMENTS FINIS TRIANGULAIRES DE COQUE." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2006. http://tel.archives-ouvertes.fr/tel-00169852.
Full textAbstract:
Dans les applications, on rencontre fréquemment des structures minces de géométriecomplexe qui nécessitent l'utilisation de maillages surfaciques comportant des éléments
triangulaires. Il faut donc trouver des éléments finis triangulaires de coque qui
soient robustes vis-à-vis du verrouillage numérique, mais aussi au défaut de consistance.
Nous avons formulé un test numérique qui permet de détecter le verrouillage
membranaire, et également l'existence de modes parasites de membrane. L'élément
MITC6a (Bathe et Lee) apparaî t comme le meilleur élément à six noeuds, mais il
exhibe des modes parasites de membrane qui peuvent considérablement détériorer la
solution numérique. Nous proposons une technique de filtrage qui consiste à ajouter
un terme de stabilisation de cisaillement non réduit et nous avons défini l'élément
MITC6rs avec une interpolation plus riche pour le cisaillement. Après une évaluation
numérique détaillée, nous recommandons l'usage de l'élément MITC6a stabilisé.
5
Burgess, Heather Rachel. "Integral Projection Models and analysis of patch dynamics of the reef building coral Monstastraea annularis." Thesis, University of Exeter, 2011. http://hdl.handle.net/10036/3503.
Full textAbstract:
Over the past 40 years, coral cover has reduced by as much as 80%. At the same time, Coral Reefs are coming under increasing threat from hurricanes, as climate change is expected to increase the intensity of hurricanes. Therefore, it has become increasingly important to understand the effect of hurricanes on a coral population. This Thesis focuses on the reef-building coral Montastraea annularis. This species once dominated Caribbean Coral Reefs, but is fast being replaced by faster growing more opportunistic species. It is important that the underlying dynamics of the decline is understood, if managers stand any chance of reversing this decline. The aim of this Thesis is to investigate the effect of hurricane activity on the dynamics of the reef-building coral Montastraea annularis. To achieve this the Integral Projection Model (IPM) method was adopted and the results compared to those produced using the more traditional method of Population Projection Matrix (PPM) method. The models were fitted using census data from June 1998 to January 2003, which described the area of individual coral patches on a sample of ramets on Glovers Reef, Belize. Glovers Reef is a marine reserve that lies 30km off the coast of Belize and 15km east of the main barrier reef. Three hurricanes struck Glovers Reef during the study: Hurricane Mitch (October 1998), Hurricane Keith (September 2000) and Hurricane Iris (October 2001). The data have been divided by two different methods in order to test two research questions, firstly if the initial trauma following a hurricane affects the long term dynamics of a population and, secondly, if the dynamics exhibited during a hurricane varied with hurricane strength. In this Thesis five main results are shown: 1. All models for all divisions of data are in long term decline. 2. As initial trauma increased, the long term growth rates decreased, conversely the short term extremes increased. 3. Fragmentation is more likely as patch size increased and more likely under stronger hurricanes. 4. Integral Projection Modelling painted a similar picture to Population Projection Matrix models and should be a preferred method of analysis.5. Interaction of the IPMs can be used to model the changing occurrence of hurricanes under climate change. It is shown that with increased intensity, the population could become extinct 6.3 years sooner. This research is the first step in modelling coral patch populations by the IPM method. It suggests possible functional forms and compares the results with the PPM method. Further research is required into the biological functions which drive fragmentation, the method by which large patches divide into groups of smaller patches. The conclusions from this Thesis add to the growing body of knowledge concerning the response of coral species to hurricanes, focusing on the importance of understanding patch dynamics, in order to understand colonial dynamics.
6
Paris, Suarez Iria. "Robustesse des éléments finis triangulaires de coque." Paris 6, 2006. https://tel.archives-ouvertes.fr/tel-00169852v2.
Full textAbstract:
Dans les applications, on rencontre fréquemment des structures minces de géométrie complexe qui nécessitent l'utilisation de maillages surfaciques comportant des éléments triangulaires. Il faut donc trouver des éléments finis triangulaires de coque qui soient robustes vis-à-vis du verrouillage numérique, mais aussi au défaut de consistance. Nous avons formulé un test numérique qui permet de détecter le verrouillage membranaire, et également l'existence de modes parasites de membrane. L'élément MITC6a (Bathe et Lee) apparaît comme le meilleur élément à six noeuds, mais il exhibe des modes parasites de membrane qui peuvent considérablement détériorer la solution numérique. Nous proposons une technique de filtrage qui consiste à ajouter un terme de stabilisation de cisaillement non réduit et nous avons défini l'élément MITC6rs avec une interpolation plus riche pour le cisaillement. Après une évaluation numérique détaillée, nous recommandons l'usage de l'élément MITC6a stabilisé.
7
Liu, Wentao. "Poincare Waves and Kelvin Waves in a Circular Lake." Thesis, 2009. http://hdl.handle.net/10012/4265.
Full textAbstract:
When wind blows over a stratified lake an interface tilt is often generated, and internal waves usually appear after the wind stops. Internal waves in lakes are studied in many literatures, but most assume a hydrostatic pressure balance. In this thesis we discuss the internal Poincare waves and Kelvin waves in a rotating, continuously stratified, flat-bottom, circular lake with fully nonlinear and non-hydrostatic effects. An analytical solution is derived for the linearized system and it provides initial conditions used in the MIT General Circulation Model (MITgcm). This model is chosen due to its non-hydrostatic capability. Both Poincare waves and Kelvin waves are considered. The analytical solution of the linear system is verified numerically when the wave amplitude is small. As the wave amplitude increases the waves become more nonlinear. Poincare waves steepen and generate solitary-like waves with shorter wavelengths, but most of the energy contained in these waves is transferred back and forth between the parent wave and the solitary-like waves. Kelvin waves, on the other hand, steepen and lose their energy to solitary-like waves. The appearance of the solitary-like waves is not absolutely clear and higher resolution is required to clear up the details of this process. This conclusion agrees with de la Fuente et al (2008) who discussed the internal waves in a two-layer model. Moreover, in the Kelvin waves case, unexpected small waves are generated at the side boundaries and travel inwards. The wave amplitude and wavelength of these spurious waves become smaller as the horizontal resolution increases. One possible reason to explain these waves is the use of square grids to approximate the circular lake.
8
Dunphy, Michael. "The Influence of Mesoscale Eddies on the Internal Tide." Thesis, 2009. http://hdl.handle.net/10012/4575.
Full textAbstract:
The barotropic tide dissipates a well established estimate of 2.5 TW of energy at the M2 frequency. Bottom topography is responsible for part of this dissipation, and the generation of the internal tide is also partly responsible. The fate of this energy is largely described by a cascade from large scales to small scales by non-linear wave-wave interactions where it gets dissipated.
This thesis aims to investigate how the presence of mesoscale eddies (vortices) in the ocean affect the internal tide. Previous work has looked at the interaction of the barotropic tide with eddies. Krauss (1999) found that the interaction can produce a modulated internal tide, however a scaling analysis suggests that the effect may not be as strong as reported.
The MITgcm is used to simulate internal wave generation by barotropic flow over topography and comparisons are made with Dr. Lamb's IGW model. Baroclinic eddies are analytically prescribed and then geostrophically adjusted also using the MITgcm. Finally, the two are combined, and the internal tide field is analysed with and without the presence of eddies of various magnitude and length scales.
The results of this investigation do not find a strong transfer of energy between modes; the modal distribution of energy in the internal tide remains the same when an eddy is added. However, focusing and shadow beams of internal waves are produced in the wake of an eddy as the internal waves pass through it. The beams show very strong variations in intensity, vertically integrated energy flux can reduce almost to zero in the shadow regions and increase more than double in the focusing regions.
Modal decomposition of the horizontal flow field reveals that mode 2 and 3 waves are most strongly affected by the eddies and contribute strongly to the formation of the beams. Mode 1 appears to be less affected by the eddy. The larger wavelength and faster group velocity of mode 1 supports the notion that the eddy interacts with it less.
9
Chung, Jian-Hou, and 鍾鑒厚. "DO-MITIC Model for Lean Production." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/42588768047350368586.
Full textAbstract:
碩士玄奘大學
企業管理學系碩士在職專班
102
In response to the fast changing product and marketing demands, optical glass manufacturers need to develop new products constantly. And the most critical key to survival is whether they can put the new products into production efficiently. We found most optical glass manufacturers in this study have common problem of incoming quality control, low yield rate, and shipment delay. Therefore, this study tries to utilize DO-MITIC problem solving methods to improve these manufacturers quality, delivery and cost model. In the end, it proves the DO-MITIC analytical method can be utilized on production management effectively.
10
HSU, Jerry J. Y., and 許哲毓. "The Model of Construction For Business Combination Style--------A Case Study of CISCO、ACER And MITAC Group." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/59890745219705649712.
Full textAbstract:
碩士大葉大學
事業經營研究所
89
Due to the gradually growth of competition in global market, not only the number but also the scales of business combinations, from which companies might benefit, do quickly increase. To enhance companies'' international competitive capability, the government''s policy recently tends to encourage business combinations as well. While business combinations might increase their capabilities to compete in the international market, one has to pay more attention on whether business combinations can make them more competitive in the international market as what are expected. This paper studies the style of business combination over three aspects: combination intention (strategy construct), combination manner (endogenous construct), and relative suitability (exopathic construct). The purposes of this paper are as follows: 1.To investigate the operation strategy and the course of combination of each individual company. 2.To set up a model for business combination. 3.To develop the propositions of business combination. To proceed, this paper first surveys the opinions of mergers, acquisitions, alliance, and combine control in recent literatures, and then tries to establish a conceptual study frame, called "Conceptual Framework for Business Combination Style". By following this framework, the cases of the biggest foreign company and two of local top ten groups will be investigated; and then, with data, several propositions are developed. Additionally, the following contributions from this paper might be useful for domestic business parties: 1.Patterns of business combination, by which some suggestions on "external expand strategy" are offered. 2.A traceable model of combination propositions, which might make business combination more successfully.
Book chapters on the topic "MITgcm model"
1
Kowalczuk, Zdzisław, and Cezary Orłowski. "Model of Information Technology Management - MITM." In Advanced Modeling of Management Processes in Information Technology, 13–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40877-9_2.
Full text
2
Kowalczuk, Zdzisław, and Cezary Orłowski. "Verification of the Model of Information Technology Management (MITM)." In Advanced Modeling of Management Processes in Information Technology, 137–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40877-9_4.
Full text
3
Liao, Zonghu, Kun Yang, Yang Hong, and Dalia Kirschbaum. "Assessment of Shallow Landslides Induced by Mitch Using a Physically Based Model." In Hydrologic Remote Sensing, 319–30. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315370392-18.
Full text
4
"Sensitivity of MITgcm to different model parameters in application to Cayuga Lake." In Environmental Hydraulics, Two Volume Set, 393–98. CRC Press, 2010. http://dx.doi.org/10.1201/b10553-63.
Full text
5
Chapelle, D., D. L. Oliveira, and M. L. Bucalem. "Some experiments with the MITC9 element for Naghdi's shell model." In Computational Fluid and Solid Mechanics, 107–10. Elsevier, 2001. http://dx.doi.org/10.1016/b978-008043944-0/50582-5.
Full text
6
Khandelwal, Sarika, Shaleen Bhatnagar, Nirmal Mungale, and Ritesh Kumar Jain. "Design of a Blockchain-Powered Biometric Template Security Framework Using Augmented Sharding." In Advancements in Quantum Blockchain With Real-Time Applications, 80–101. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-5072-7.ch004.
Full textAbstract:
Biometric templates must be secured with traceability, immutability, and high-trust capabilities. A variety of system models are proposed by researchers, most of which either utilize blockchains or machine learning for improved security and quality of service (QoS). The augmented sharding model is designed using light weight incremental learning framework, which assists in shard formation and management. Performance evaluation of the proposed model indicates that it is able to achieve high accuracy attack mitigation, along with low block mining delay and high throughput. This performance is compared with various state-of-the-art methods and an improvement of 10% in terms of delay and 14% in terms of throughput is achieved. Further, an attack detection accuracy of 99.3% is obtained for sybil, masquerading, and man in the middle (MITM) attacks. This text further recommends improvement areas which can be further researched for enhancing security and QoS performance of the proposed model.
7
Kumari, Emarti. "Dynamic Analysis of High-Rise Buildings Using Simplified Numerical Method." In Vibration Monitoring and Analysis - Recent Advances [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.108556.
Full textAbstract:
This chapter emphasizes on the static and dynamic characteristics of multi-story building subjected to uniformly distributed and wind load. First-order shear deformation theory is used to formulate governing equations based on the finite element method. The multi-story building is considered as a vertical cantilever beam/plate and modeled using nine-node degenerated shell element. Fictitious membrane and shear stresses are eliminated by considering Mixed Interpolation Tonsorial Component (MITC) technique. Here, the static and dynamic characteristics of multi-story buildings have been investigated take into account as a vertical cantilever plate subjected to UDL, triangular load (wind load) and combination of both. In this chapter authors demonstrated the deformation shapes, longitudinal stress and in-plane shear stress and principle strains in various loading conditions of vertical cantilever flat panel. Moreover, investigated the dynamic characteristics of multi-story buildings considering as a vertical cantilever plates and governing equations of motion are derived by employing Hamilton’s principle. Moreover, nonlinear transient response of high-rise structures has been studied here by employing the energy and momentum conservation implicit time integration scheme. The structural analysis of tall buildings has been carried out here through commercial software ANSYS. Matrix amplitude method is employed to investigate the large-amplitude flexural vibration responses of flat panels. Also, plotted the fast Fourier transform and phase portraits for first three bending modes.
Conference papers on the topic "MITgcm model"
1
Kodaira, Tsubasa, and Takuji Waseda. "ADCP Observation and Numerical Model Prediction of Tidal Currents Near Kozu Island." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78220.
Full textAbstract:
Izu island chain south of Tokyo, Japan has been considered as a prospective area for ocean renewable energy development because of relatively strong tidal currents, and the Kuroshio current. An Acoustic Doppler Current Profiler (ADCP) measurement near one of the islands, Kozu island, was conducted to know ocean current variability. The ADCP, Signature500, was installed 700m away from the coast and the water depth is 32m there. The observation period is for a month from January 8th, 2017. Vertical profile of the currents was recorded every 1 m at 1 minute interval. Based on the observation, the peak tidal currents were often more than 1m/s, and the maximum total speed exceeded 2m/s. The maximum flow is probably related to the Kuroshio intrusion because temperature increased abruptly. Typical vertical profile of the current follows the logarithmic law except for the near surface area. To study the spatial distribution of the current around Kozu island, a numerical model is developed based on MIT General Circulation Model (MITgcm). The model prediction of tidal sea surface variation is in a good agreement with the observation. The model underestimated the tidal currents, but the phase is in a reasonable agreement with the ADCP observation result.
2
Jeans, Gus, Oliver Jones, Michael Zhang, Christopher R. Jackson, Nataliya Stashchuk, Alfred R. Osborne, Ole Svenstrup Petersen, and José da Silva. "A New Method for Deriving Soliton Design Criteria." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96637.
Full textAbstract:
Abstract A new method for deriving extreme soliton current criteria for offshore engineering applications is described. The primary data source was site specific measurement close to the continental shelf break where metocean criteria were required. A dedicated oceanographic mooring was designed to quantify solitons, with rapidly sampled measurement of seawater temperature and velocities through the vertical. As described in two previous OMAE papers, quantification of soliton velocity profiles was achieved via temperature measurement and theory, with measured velocities playing a secondary role in critical validation. The previous methodology was extended in the present study, with separate contributions quantified from variations in soliton amplitude and water column density structure. The nonlinear Fourier techniques first described in OMAE 2017 were again used to reduce uncertainty in estimates of extreme soliton amplitude. In a new development, the long-term distribution of the density structure contribution was quantified using a calibrated hindcast of seawater temperature. Extreme conditions were defined at the boundary of a MITgcm model domain. This sophisticated model was then used to estimate extreme soliton velocities, through the water column and a few metres above the seabed, at a wide range of shallower target locations.
3
Ji, Ming, and Kazuaki Inaba. "Efficient and Flexible Finite Element Procedure for Free and Forced Vibration Problems of a Plate Coupled With Fluid." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21535.
Full textAbstract:
Abstract Identifying the coupled system natural frequencies and dynamic behavior of systems in the presence of fluid-structure interaction is one of the most important issues in the engineering design of buildings, road vehicles and aircraft. This paper presents an efficient and flexible finite element procedure using fully vectorized codes for the free and forced vibration analysis of a rectangular plate in contact with fluid. The 4-node MITC plate finite element (MITC4) based on the Mindlin plate theory is used to simulate the plate, while the 8-node acoustic pressure element is used to simulate the fluid. The derived system of equations using structural displacements and fluid pressures yields a non-symmetric system of equations. Solving the generalized eigenvalue problem for the non-symmetric system is more computationally intensive compared to solving the generalized eigenvalue problem for symmetric systems. The modal expansion technique is used to reduce the model size. Then the reduced non-symmetric system is symmetrized by right eigenvectors. The Newmark method is used to solve the forced vibration problem of the coupled systems. The effect of the height of the fluid on the natural frequencies is discussed. The natural frequencies and transient responses are in good agreement with those obtained from the commercial finite element software. Moreover, the technique is proved to be effective to solve the coupled system.
4
Chen, Chenyi, Li Li, Jianming Hu, and Chenyao Geng. "Calibration of MITSIM and IDM car-following model based on NGSIM trajectory datasets." In 2010 IEEE International Conference on Vehicular Electronics and Safety (ICVES 2010). IEEE, 2010. http://dx.doi.org/10.1109/icves.2010.5550943.
Full text
5
Li, Shuxin, Xiaohong Li, Jianye Hao, Bo An, Zhiyong Feng, Kangjie Chen, and Chengwei Zhang. "Defending Against Man-In-The-Middle Attack in Repeated Games." In Twenty-Sixth International Joint Conference on Artificial Intelligence. California: International Joint Conferences on Artificial Intelligence Organization, 2017. http://dx.doi.org/10.24963/ijcai.2017/523.
Full textAbstract:
The Man-in-the-Middle (MITM) attack has become widespread in networks nowadays. The MITM attack would cause serious information leakage and result in tremendous loss to users. Previous work applies game theory to analyze the MITM attack-defense problem and computes the optimal defense strategy to minimize the total loss. It assumes that all defenders are cooperative and the attacker know defenders' strategies beforehand. However, each individual defender is rational and may not have the incentive to cooperate. Furthermore, the attacker can hardly know defenders' strategies ahead of schedule in practice. To this end, we assume that all defenders are self-interested and model the MITM attack-defense scenario as a simultaneous-move game. Nash equilibrium is adopted as the solution concept which is proved to be always unique. Given the impracticability of computing Nash equilibrium directly, we propose practical adaptive algorithms for the defenders and the attacker to learn towards the unique Nash equilibrium through repeated interactions. Simulation results show that the algorithms are able to converge to Nash equilibrium strategy efficiently.
6
Kim, Suin, and Joonbum Bae. "Force-mode control of rotary series elastic actuators in a lower extremity exoskeleton using model-inverse time delay control (MiTDC)." In 2016 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS). IEEE, 2016. http://dx.doi.org/10.1109/iros.2016.7759564.
Full text
7
Zhang, Liumei, Yu Han, Yichuan Wang, and Ruiqin Quan. "Petri Net Model of MITM Attack Based on NDP Protocol." In 2022 International Conference on Networking and Network Applications (NaNA). IEEE, 2022. http://dx.doi.org/10.1109/nana56854.2022.00074.
Full text
8
Castañeda, Alejandro Triana, and Enrique González Guerrero. "MITC: An Intention-Based Model for Cooperative Resolution of Traffic Conflicts." In 2014 Federated Conference on Computer Science and Information Systems. IEEE, 2014. http://dx.doi.org/10.15439/2014f491.
Full text
9
Wang, Jielong. "Finite Element Modeling of Geometrically Exact Shell With Large Deformation and Rotation." In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-68429.
Full textAbstract:
Abstract This paper developed a new geometrically exact shell element to model the relatively thin structures with large deformations and arbitrary rigid motions. The deformations were well decoupled from rigid motions by using the direct modeling approach. The rotation-free Green-Lagrange strain tensor described the large deformations together with geometrical nonlinearities. Meanwhile, the Wiener-Milenković parameter was applied to vectorial parameterize the arbitrary rotations of the fiber avoiding the singularities usually occurred in the classical shell formula. This paper also designed a new interpolating algorithm without losing objectivity to discretize the vectorial parameters, which improves the robustness of new shell element. The application of Mixed Interpolation of Tensorial Components with 9 nodes (MITC9) makes the shell element shear-locking free and with second-order accuracy. Each node contains five degrees of freedom, three for translations and two for rotations, achieving a minimal set representation of arbitrary motions. These innovations contribute to a new shell formula featuring high computational efficiency with good accuracy. Finally, two flexible multibody dynamic models are discretized by this new shell element. The numerical simulation results of the new shell element have been verified to demonstrate the capability of new shell element dealing with large deformations and arbitrary motions of thin structures.
10
Butnaru, Tatiana. "O problemă de circulaţie folclorică dintr-o perspectivă comparată." In Filologia modernă: realizări şi perspective în context european. “Bogdan Petriceicu-Hasdeu” Institute of Romanian Philology, Republic of Moldova, 2021. http://dx.doi.org/10.52505/filomod.2021.15.06.
Full textAbstract:
În articolul de faţă este propusă spre analiză balada Voichiţa, cu versiunile sale româneşti, greceşti sau sârbești, de o largă circulaţie în arealul daco-român. Balada este cunoscută la mai multe popoare şi, după opinia specialiştilor, „subiectul artistic exploatează o concepţie tipică sud-est-europeană”. Este o baladă fantastică, de circulaţie universală, cu diferite întâmplări neprevăzute şi colizii de natură etică , care se menţine în limita dintre ficţiune şi realitate. În baladă este zugrăvită o realitate, de o largă semnificaţie epică, care se sprigină pe ritualurile de la nunţi şi înmormântări, relevă anumite fenomene, situaţii de viaţă arhaică, legate de practici şi interdicţii specifice în modul de existenţă al familiei patriarhale. Blestemul matern şi călătoria fratelui mort aprofundează nucleul epic al narațiunii, ce va menţine subiectul, în zona fabulosului mitic. Privită dintr-o altă perspectivă, balada vizează acţiunile omeneşti, aflate sub semnul predestinării malefice, în mrejele misterelor demonice.
Reports on the topic "MITgcm model"
1
Santini, D., and A. Vyas. Theoretical basis and parameter estimates for the Minority Transportation Expenditure Allocation Model (MITRAM). Office of Scientific and Technical Information (OSTI), December 1988. http://dx.doi.org/10.2172/6052439.
Full text
2
Vyas, A. D., D. J. Dantini, and S. K. Marik. Minority Transportation Expenditures Allocation Model (MITRAM): User documentation for the personal computer spreadsheet version. Office of Scientific and Technical Information (OSTI), February 1989. http://dx.doi.org/10.2172/6167450.
Full text