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Academic literature on the topic 'Casson model'

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Published: 10 March 2023

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Journal articles on the topic "Casson model"

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Sankar, D. S., and Atulya K. Nagar. "Nonlinear Fluid Models for Biofluid Flow in Constricted Blood Vessels under Body Accelerations: A Comparative Study." Journal of Applied Mathematics 2012 (2012): 1–27. http://dx.doi.org/10.1155/2012/950323.

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Pulsatile flow of blood in constricted narrow arteries under periodic body acceleration is analyzed, modeling blood as non-Newtonian fluid models with yield stress such as (i) Herschel-Bulkley fluid model and (ii) Casson fluid model. The expressions for various flow quantities obtained by Sankar and Ismail (2010) for Herschel-Bulkley fluid model and Nagarani and Sarojamma (2008), in an improved form, for Casson fluid model are used to compute the data for comparing these fluid models. It is found that the plug core radius and wall shear stress are lower for H-B fluid model than those of the Casson fluid model. It is also noted that the plug flow velocity and flow rate are considerably higher for H-B fluid than those of the Casson fluid model. The estimates of the mean velocity and mean flow rate are considerably higher for H-B fluid model than those of the Casson fluid model.
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Aghighi, Mohammad Saeid, Christel Metivier, and Hamed Masoumi. "Natural convection of Casson fluid in a square enclosure." Multidiscipline Modeling in Materials and Structures 16, no. 5 (April 5, 2020): 1245–59. http://dx.doi.org/10.1108/mmms-11-2019-0192.

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PurposeThe purpose of this paper is to analyze the natural convection of a yield stress fluid in a square enclosure with differentially heated side walls. In particular, the Casson model is considered which is a commonly used model.Design/methodology/approachThe coupled conservation equations of mass, momentum and energy related to the two-dimensional steady-state natural convection within square enclosures are solved numerically by using the Galerkin's weighted residual finite element method with quadrilateral, eight nodes elements.FindingsResults highlight a small degree of the shear-thinning in the Casson fluids. It is shown that the yield stress has a stabilizing effect since the convection can stop for yield stress fluids while this is not the case for Newtonian fluids. The heat transfer rate, velocity and Yc obtained with the Casson model have the smallest values compared to other viscoplastic models. Results highlight a weak dependence of Yc with the Rayleigh number: Yc∼Ra0.07. A supercritical bifurcation at the transition between the convective and the conductive regimes is found.Originality/valueThe originality of the present study concerns the comprehensive and detailed solutions of the natural convection of Casson fluids in square enclosures with differentially heated side walls. It is shown that there exists a major difference between the cases of Casson and Bingham models, and hence using the Bingham model for analyzing the viscoplastic behavior of the fluids which follow the Casson model (such as blood) may not be accurate. Finally, a correlation is proposed for the mean Nusselt number Nu¯.
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Pandey, S. K., and Dharmendra Tripathi. "A Mathematical Model for Swallowing of Concentrated Fluids in Oesophagus." Applied Bionics and Biomechanics 8, no. 3-4 (2011): 309–21. http://dx.doi.org/10.1155/2011/782414.

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This model investigates particularly the impact of an integral and a non-integral number of waves on the swallowing of food stuff such as jelly, tomato puree, soup, concentrated fruits juices and honey transported peristaltically through the oesophagus. The fluid is considered as a Casson fluid. Emphasis is on the study of the dependence of local pressure distribution on space and time. Mechanical efficiency, reflux limit and trapping are also discussed. The effect of Casson fluid vis-à-vis Newtonian fluid is investigated analytically and numerically too. The result is physically interpreted as that the oesophagus makes more efforts to swallow fluids with higher concentration. It is observed that the pressure is uniformly distributed when an integral number of waves is there in the oesophagus; but it is non-uniform when a non-integral number of waves is present therein. It is further observed that as the plug flow region widens, the pressure difference increases, which indicates that the averaged flow rate will reduce for a Casson fluid. It is also concluded that Casson fluids are more prone to reflux.
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Mohd Kasim, Abdul Rahman, Nur Syamilah Arifin, Syazwani Mohd Zokri, Mohd Zuki Salleh, Nurul Farahain Mohammad, Dennis Ling Chuan Ching, Sharidan Shafie, and Noor Amalina Nisa Ariffin. "Convective Transport of Fluid–Solid Interaction: A Study between Non-Newtonian Casson Model with Dust Particles." Crystals 10, no. 9 (September 15, 2020): 814. http://dx.doi.org/10.3390/cryst10090814.

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The Casson model is a fascinating model, which is genuinely recommended for use with fluids of a non-Newtonian type. The conventional model is not capable to represent the Casson model with the suspension of foreign bodies (dust particles). Due to this, the two-phase model for the mixture of Casson model fluid and dust particles is formulated. This study examines the emerging role of dust particles in changing the behavior of Casson model. In particular, two-phase flow of dusty Casson model with modified magnetic field and buoyancy effect under Newtonian heating boundary condition along a vertically stretching sheet is considered. The equations that govern under Casson model, together with dust particles, are reduced to a system of nonlinear ordinary differential equations by employing the suitable similarity variables. These transformed equations are then solved numerically by implementing the Runge–Kutta–Fehlberg (RKF45) method. The numerical results of skin friction coefficient plus Nusselt number are displayed graphically. The results revealed the fluid’s velocity tends to deteriorate due to the existence of dust particles, whilst its temperature is increased. The two-phase flow is one of the mathematical modeling techniques for multiphase flow, where the relationship between the fluid and solid is examined more closely. It is expected that the present findings can contribute to the understanding of the theory of two-phase flow mathematically, which will continue to produce significant research in this field.
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Chaves, Modesto Antonio, Fátima Baptistia, Jadir Noqueira da Silva, Luciano Rodrigues, and Arianne Dantas Viana. "A Rheological Model for Cupuassu (Theobroma grandiflorum) Pulp at Different Concentrations and Temperatures." International Journal of Food Engineering 9, no. 4 (October 31, 2013): 353–63. http://dx.doi.org/10.1515/ijfe-2012-0194.

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AbstractThis work was made aiming at studying the best model for the rheological properties of Cupuassu (Theobroma grandiflorum, Schum) pulps with 14 (in nature), 17, 19, 23 and 25°Brix of total soluble solids (TSS) which were measured at 20, 30, 40, 50 and 60°C temperature using a concentric cylinder rheometer. The results were adjusted to the following nine models: Ostwald-de-Waele (power law), Bingham, Casson, Generalized Casson, Heinz–Casson, Herschel–Bulkley, Mizrahi–Berk, Schulmann–Haroske–Reher and Windhab. The parameters of the best model were correlated with pulp temperature and TSS by polynomial regression analysis and were kept in the regression equation only those parameters that contributed more than 1% to the variation of the independent variable. The results indicate that the rheological behavior of Cupuassu pulp in different concentrations and temperatures can be modeled by the Windhab model, although other models can be used in a narrower band of shear stress.
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Sankar, D. S., and Yazariah Yatim. "Comparative Analysis of Mathematical Models for Blood Flow in Tapered Constricted Arteries." Abstract and Applied Analysis 2012 (2012): 1–34. http://dx.doi.org/10.1155/2012/235960.

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Pulsatile flow of blood in narrow tapered arteries with mild overlapping stenosis in the presence of periodic body acceleration is analyzed mathematically, treating it as two-fluid model with the suspension of all the erythrocytes in the core region as non-Newtonian fluid with yield stress and the plasma in the peripheral layer region as Newtonian. The non-Newtonian fluid with yield stress in the core region is assumed as (i) Herschel-Bulkley fluid and (ii) Casson fluid. The expressions for the shear stress, velocity, flow rate, wall shear stress, plug core radius, and longitudinal impedance to flow obtained by Sankar (2010) for two-fluid Herschel-Bulkley model and Sankar and Lee (2011) for two-fluid Casson model are used to compute the data for comparing these fluid models. It is observed that the plug core radius, wall shear stress, and longitudinal impedance to flow are lower for the two-fluid H-B model compared to the corresponding flow quantities of the two-fluid Casson model. It is noted that the plug core radius and longitudinal impedance to flow increases with the increase of the maximum depth of the stenosis. The mean velocity and mean flow rate of two-fluid H-B model are higher than those of the two-fluid Casson model.
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Sankar, D. S., and Usik Lee. "Pulsatile Flow of Two-Fluid Nonlinear Models for Blood Flow through Catheterized Arteries: A Comparative Study." Mathematical Problems in Engineering 2010 (2010): 1–21. http://dx.doi.org/10.1155/2010/121757.

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The pulsatile flow of blood through catheterized arteries is analyzed by treating the blood as a two-fluid model with the suspension of all the erythrocytes in the core region as a non-Newtonian fluid and the plasma in the peripheral layer as a Newtonian fluid. The non-Newtonian fluid in the core region of the artery is represented by (i) Casson fluid and (ii) Herschel-Bulkley fluid. The expressions for the flow quantities obtained by Sankar (2008) for the two-fluid Casson model and Sankar and Lee (2008) for the two-fluid Herschel-Bulkley model are used to get the data for comparison. It is noted that the plug-flow velocity, velocity distribution, and flow rate of the two-fluid H-B model are considerably higher than those of the two-fluid Casson model for a given set of values of the parameters. Further, it is found that the wall shear stress and longitudinal impedance are significantly lower for the two-fluid H-B model than those of the two-fluid Casson model.
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Devi, M., J. Sharma, and U. Gupta. "Instability in Casson nanofluids for Darcy-Brinkman model." IOP Conference Series: Materials Science and Engineering 1225, no. 1 (February 1, 2022): 012011. http://dx.doi.org/10.1088/1757-899x/1225/1/012011.

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Abstract The convective instability of Casson nanofluids saturating porous medium is investigated analytically and numerically. Darcy-Brinkman law is utilized to frame the momentum equation for the system. The governing equations are simplified using normal mode analysis and linear stability theory. The present study finds the expressions of thermal Rayleigh number for various boundaries and discusses the convective instability under various effects with the help of Wolfram Mathematica software. Out of all the boundaries, the instability of the layer is found to be least for both rigid boundaries. It is established that the convection in the fluid gets delayed due to porosity effects while non-Newtonian property and nano scale effects contribute significantly in making the layer unstable.
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Shukla, A. K., Yogendra Kumar Dwivedi, and Mohammad Suleman Quraishi. "A Numerical Simulation of Soret-Dufour effect on Unsteady MHD Casson Fluid Flow past a vertical plate with Hall current and viscous dissipation." International Journal of Chemistry, Mathematics and Physics 6, no. 4 (2022): 05–18. http://dx.doi.org/10.22161/ijcmp.6.4.2.

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The Casson fluid model, which is very significant in the biomechanics and polymer processing industries, is another term used to describe non-Newtonian fluid behavior. This study of Casson fluid model on unsteady MHD Casson fluid flow with Soret-Dufour effect past a vertical plate embedded in porous medium in the presence of radiation with heat generation/absorption and viscous dissipation is presented in this research article as a numerical investigation of non Newtonian Casson fluid with applied effects. Regulating partial differential equations have been used to explain the mathematical model of the flow field. The Crank-Nicolson implicit finite difference approach has been used to numerically solve non-dimensionalized flow field governing equations. Concentration, temperature, and velocity profile effects of non-dimensional factors have been investigated using tables and graphs as aids. Tables have also been used to observe fluctuations in factors like skin friction, the Nusselt number, and the Sherwood number in relation to other parameters.
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Mahdy, A., and A. Chamkha. "Heat transfer and fluid flow of a non-Newtonian nanofluid over an unsteady contracting cylinder employing Buongiorno’s model." International Journal of Numerical Methods for Heat & Fluid Flow 25, no. 4 (May 5, 2015): 703–23. http://dx.doi.org/10.1108/hff-04-2014-0093.

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Purpose – The purpose of this paper is to discuss a combined similarity-numerical approach that is used to study the unsteady two-dimensional flow of a non-Newtonian nanofluid over a contracting cylinder using Buongiorno’s model and the Casson fluid model that is used to characterize the non-Newtonian fluid behavior. Design/methodology/approach – Similarity transformations are employed to transform the unsteady Navier-Stokes partial differential equations into a system of ordinary differential equations. The transformed equations are then solved numerically by means of the very robust symbolic computer algebra software MATLAB employing the routine bvpc45. Findings – The effect of increasing values of the Casson parameter is to suppress the velocity field (in absolute sense), the temperature and concentration decrease as Casson parameter increase. The heat and mass transfer rates decrease with the increase of unsteadiness parameters and Brownian motion parameter. In addition, they increase as the Casson parameter and the thermophoresis parameter increase. Originality/value – The problem is relatively original and represents a very important contribution to the field of non-Newtonian nanofluids.
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Dissertations / Theses on the topic "Casson model"

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James, Ryan Douglas. "Modeling Riverboat Casino Customer Behavior in the Cincinnati Market." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186079482.

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Choquette, Carolyne. "Evaluating management practices to limit phosphorus losses from agricultural fields in the Castor watershed using the WEND model." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81612.

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The objective of this study was to apply the WEND model, a nutrient mass balance model, to the Castor watershed in southern Quebec to evaluate phosphorus movement, storage and export over time. The WEND model was customized to run on a field-scale and then individually applied to 266 fields on the watershed for a 30-year simulation period. Field-specific information for the period of 1997-1999, was used as basic inputs to the model. Climatic information was obtained from local sources. The additional information required to run the model was derived from the literature. Model outputs were analysed at three different levels: (i) the overall watershed impacts, (ii) by cropping system, and (iii) for field management practices presenting a high risk of P losses. Specific outputs examined were: soil test Mehlich-III P, soil P saturation with aluminium, RUSLE soil loss potential and TP export.
The model was used to examine the impacts of crop rotations, fertilizer application and tillage management on TP export. For the Castor watershed, the soil test P increased at a mean rate of 3.71 kg Mehlich-III P ha -1 yr-1, equivalent to a mean input of about 32 kg P2O5 ha-1 yr-1 in excess of plant requirements, assuming current field management practices remain constant.
If TP export is considered the most important parameter in terms of P contamination, crop rotations are a good alternative to continuous corn monocropping under which losses could reach as high as 3.36 kg TP ha-1 yr -1. Crop rotations were shown to be an important management practice that should be more carefully examined when establishing field management practices. Just one year of grassland within a rotation can greatly improve the overall environmental health of a watershed. The management of P inputs is also an important target for improvement, as fertiliser inputs often surpassed plant requirements by two- or three-fold.
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Phillips, WooMi Jo. "Senior casino motivation and gaming intention : an extended theory of planned behavior model." Diss., Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1124.

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Mshayisa, Vusi Vincent. "Antioxidant effects of Maillard reaction products (MRPs) derived from glucose-casein model systems." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2505.

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Thesis (MTech (Food Technology))--Cape Peninsula University of Technology, 2016.
The Maillard reaction (MR) involves the condensation reaction between amino acids or proteins with reducing sugars, which occurs commonly in food processing and storage. Maillard reaction products (MRPs) were prepared from glucose-casein model system at pH 8, heated at 60, 75 and 90°C for 6, 12 and 24 h, respectively. Browning intensity (BI) of MRPs, as monitored by absorbance at 420 nm increased with an increase in reaction temperature. The reducing power (RP) of MRPs increased (p < 0.05) as the reaction time increased at 60 and 75°C, while at 90°C an increase in RP was observed from 6 to 12 h and thereafter a slight decrease was observed up to 24 h. The 2,2-Azino-bis-(3-ethylbenzthiazoline-6-sulfonic acid) radical scavenging activity (ABTS-RS) and Peroxyl radical scavenging (PRS) activity of glucose-casein MRPs produced at 90°C decreased as the reaction time increased. In this study, the ferrous chelation activity of MRPs was higher than that of tert-butylhydroquinone (TBHQ) (0.02%) and Trolox (1 mM), respectively. Moreover, the 1, 1-diphenyl-2-picryl-hydrazil radical scavenging (DPPH-RS) of MRPs increased (p < 0.05) as the reaction time increased irrespective of the heating temperature. The primary and secondary lipid oxidation products were measured using the Peroxide value (PV) and Thiobarbituric acid reactive substance (TBARs) assay in sunflower oil-in-water emulsion, respectively. MRPs derived at 90°C for 12 h had the lowest peroxide value, while the TBARs inhibitory by MRPs ranged from 39.05 – 88.66%. Glucose-casein MRPs displayed superior antioxidant activity than TBHQ (0.02%) and Trolox (1 mM), respectively, as measured by the TBARs assay. The differential scanning calorimetry (DSC) and Rancimat techniques set at 110°C were used to evaluate the oxidative stability the lipid-rich media containing MRPs. At the same temperature program, DSC gave significantly lower reduction times than the Rancimat. Furosine (N-ε-Fructosyl-lysine) and Pyrraline (2-amino-6-(2-formyl-5-hydroxymethyl-1-pyrrolyl)-hexanoic acid) were determined using high pressure liquid chromatography to evaluate the extent of the MR. Furosine concentration of glucose-casein MRPs ranged between 0.44 – 1.075 mg.L-1 in MRPs derived at 60°C, while at 75°C an increase as function of time was observed. MRPs derived at 60 and 75°C exhibited a varied concentration of pyrraline as the reaction time increased with higher temperatures resulted in higher concentrations (0.39 mg.L-1). The results of this study clearly indicated that MRPs possess antioxidant activity and can be used as natural antioxidants in the food industry.
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Böhm, Anke. "Untersuchungen zur Proteolyse von para-k-Casein vom Modell zum Käse /." [S.l. : s.n.], 2003. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10673677.

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Böhm, Anke. "Untersuchungen zur Proteolyse von para-k-Casein: vom Modell zum Käse." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2003. http://nbn-resolving.de/urn:nbn:de:swb:14-1055498240843-26828.

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Para-k-Casein entsteht durch Hydrolyse des kappa-Caseins nach Zugabe proteolytischer Enzyme zur Milch. Untersuchungen an selbst erstellten Modellen unter Bedingungen, die die Käsereifung simulieren, zeigen, dass die Proteolyse des für die Käsereifung bedeutenden para-k-Caseins stark vom Wassergehalt abhängt. Mit Hilfe geeigneter Methoden (SDS-Elektrophorese, IEF, GPC, RP-HPLC, ESI-MS u.a.) konnte der Abbau des para-k-Caseins durch die industriell relevanten Milchgerinnungsenzyme Chymosin, Fromase und Suparen bei unterschiedlichem Wasserangebot verfolgt werden. Para-k-Casein wird bei einem käseüblichen Wassergehalt von 60 % innerhalb von 15 Wochen über wenig höhermolekulare Spaltprodukte überwiegend zu Peptiden mit Molmassen im Bereich von 400-1400 Da abgebaut. Wie elektrophoretische Untersuchungen zeigen, wird para-k-Casein auch im Sauermilchkäse abgebaut. Allerdings ist die Detektion der in sehr geringer Menge entstandenen Hydrolyseprodukte problematisch
K-casein is one of the original casein components in milk. Model-experiments under cheese ripening conditions demonstrate the hydrolysis of para-k-Casein, which is the hydrophobic part of kappa-casein, by rennet and rennet substitutes fromase and suparen. Different water contents influences the dimension of hydrolysis of para-k-Casein. A water content of 60 % usual found in cheese results in a great number of hydrolysis products from para-k-Casein with molecular weights between 400-1400 Da. The hydrolyses was investigated for a time period of 15 weeks by several analytical methods (i.e RP-HPLC, ESI-MS, electrophoretic methods, and others). Investigations by electrophoresis of the ripening process of acid curd cheese demonstrated that para-k-Casein is also hydrolysed in this type of cheese, but the detection is quite difficult
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Sarantis, Stylianos. "Thermodynamic Interactions of Micellar Casein and Oat ß-Glucan in a Model Food System." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531829793743745.

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Granlund, Jesper, and Patrik Holmstén. "CASIO–modellen vägen till välbefinnande? : en interventionsstudie om den positiva psykologins påverkan på gymnasieelever." Thesis, Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-1882.

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Syfte och frågeställningar Syftet med denna undersökning är att genom intervention utvärdera vilken effekt Positiv Psykologi, i form av CASIO-modellen, har på välmående, stresshantering och copingförmåga hos elever som går tredje året på en idrottsinriktad gymnasieutbildning. Våra frågeställningar var: - Vilka skillnader kan vi se mellan för- och eftertesten i interventionsgruppen? - Vilka skillnader kan vi se mellan för- och eftertesten i kontrollgruppen? - Vilka skillnader kan vi se mellan interventions- och kontrollgruppen i för- och eftertesten? Metod Vi har använt oss av en kvantitativ interventionsstudie som pågick i sex veckor med en grupp elever som gick tredje året på ett idrottsinriktat gymnasium som valdes ut genom ett bekvämlighetsurval. Interventionen hade CASIO-modellen ( Circumstances, Attitude, Standards, Importance & Other things) som grund. Denna modell är sprungen ur den positiva psykologin, och den syftar till att ge deltagarna verktyg att lösa problem i livet och öka sin livskvallitet. För att besvara våra frågeställningar har vi använt oss av tre olika enkäter som behandlar välmående, stress och copingförmåga. Dessa enkäter besvarades före och efter interventionen. För att analysera resultaten från för- och eftertesterna har vi använt oss av statistikprogrammet SPSS och gjort Paired Sample T-tests. Resultat När det kom till totat välmående och stresshantering fann vi inga statistiskt signifikanta förbättringar eller försämringar i interventionsgruppen. Däremot hade det skett statistiskt signifikanta försämringar inom vissa områden inom välmåendet. Interventionsgruppen hade dock statistiskt signifikant förbättrats på ett område inom copingförmåga och det var när det kom till strategin att ventilera tankar. Slutsats Vår studie gav inga större positiva effekter på gymnasieelever på ett idrottsinriktat gymnasium utan snarare tvärtom. Dock kan tidpunkten för för- och eftertesten fungera som en confounder som kan påverka de statistiskt signifikanta försämringar då eleverna hade en hög arbetsbelastning i skolan vid eftertesterna vilket de inte hade vid förtesterna.
Aim The purpose of this study was to investigate if Positive Psychology, in terms of the CASIOmodel, through intervention affected students at a sports gymnasium when it comes to wellbeing, stress and coping abilities. We focused on the following questions: - What differences can we see from the pre- to the after tests in the intervention group? - What differences can we see from the pre- to the after tests in the control group? - What differences can we see between the intervention- and control group in the pre and the after tests? Method The method we used in our study was a six week long quantitative intervention and the participants was students at a sports gymnasium. We used a convenience selection. We used the CASIO-model (Circumstances, Attitude, Standards, Importance & Other things) as foundation for the intervention. This model is originated from the Positive Psychology and gives the participants tools to solve problems in life and increase their quality of life. To answer our questions we have used three different surveys that process well-being, stress and coping abilities. These surveys were handed out to the students before the intervention and one week after it was finished. To interpret the results we ran a couple of Paired Sample Tests in the statistic program SPSS. Results When it came to total well-being and stress there were no statistical significant changes in the intervention group. But when it came to some parts of the well-being there were some statistical significant deteriorations. In the coping ability survey there were some positive statistical significant changes in the coping strategy ventilate thoughts. Conclusions Our study did not have any major positive effects on students at a sports gymnasium, rather the opposite effect. The time for the pre- and after test  could work as a confounder that affects the result because by the time of the after test the students had a heavier workload at school than at the pretest.
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Li, Zheng. "Interactions of flavor compounds with soy and dairy proteins in model systems /." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9974652.

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SILVA, Juciene Bezerra Rodrigues da. "Efeitos de Schinus terebintifolius Raddi e Cassia occidentalis Linn em modelo experimental da doença de Huntington." Universidade Federal de Pernambuco, 2011. https://repositorio.ufpe.br/handle/123456789/3303.

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O aumento na incidência de doenças neurodegenerativas em todo o mundo tem proporcionado um interesse cada vez maior nos estudos que visam novas estratégias para a prevenção e cura destas patologias. Várias evidências têm demonstrado que alterações mitocondriais e elevados níveis de estresse oxidativo estão fortemente associados ao desenvolvimento de muitas doenças típicas do envelhecimento como Alzheimer, Parkinson e Huntington. Vários modelos animais vêm sendo utilizados para estudar as características neuropatológicas e bioquímicas dessas doenças e determinar novas abordagens terapêuticas. O ácido 3- nitropropiônico (3-NP) é uma neurotoxina que inibe a succinato desidrogenase (SDH), uma enzima do complexo II da cadeia respiratória mitocondrial, que leva a déficit energético, liberação de cálcio mitocondrial, estresse oxidativo e morte celular, mimetizando muitos dos sintomas motores, cognitivos e psiquiátricos da doença de Huntington (DH). Embora não tenha sido encontrada uma terapêutica que cure ou impeça, de forma efetiva, a progressão destas doenças, compostos naturais com atividade antioxidante têm demonstrado efeito neuroprotetor. O objetivo do presente trabalho foi avaliar a atividade neuroprotetora do extrato seco da casca do caule de Schinus terebinthifolius (ST) e do extrato seco de caules e folhas de Cassia occidentalis (CO) sobre parâmetros comportamentais e bioquímicos induzidos pela administração intraperitoneal de 3-NP. Avaliações comportamentais foram realizadas utilizando os modelos de campo aberto, rotarod e labirinto em cruz elevado. A atividade antioxidante in vitro foi determinada através do método de captura do radical livre DPPH˙. A atividade antioxidante in vivo, por meio da peroxidação lidipídica (dosagem das substancias reativas ao ácido tiobarbitúrico TBARS), e da atividade enzimática da superóxido dismutase (SOD) foi avaliada na região estriatal após os testes comportamentais. A administração intraperitoneal de 3-NP (30 mg/kg por 5 dias) causou significativa perda de peso corporal, déficit motor (performance no campo aberto e rotarod) e perda de retenção de memória (performance no labirinto em cruz elevado) quando comparado aos animais controle. Além disso, análises bioquímicas revelaram significativo aumento na peroxidação lipídica e diminuição da atividade da SOD na região estriatal. O tratamento diário com ST (300 e 600 mg/kg, oral) e CO (400 e 800 mg/kg, oral) por um período de 14 dias melhorou significativamente o peso corporal, o desempenho motor e cognitivo quando comparado ao grupo doente (3-NP). Além disso, o tratamento com ST e CO significativamente atenuou a peroxidação lipídica e a diminuição da atividade da SOD. Foi observado que ST e CO apresentaram expressiva atividade antioxidante in vitro (IC50 8,81 e 53,66 μg/ml) em comparação com o padrão (BHT- butil-hidroxitolueno). Estes resultados sugerem que o efeito protetor do extrato de Schinus terebinthifolius e Cassia occidentalis contra degeneração induzida pela neurotoxina 3-NP seja mediado por sua atividade antioxidante, relacionada provavelmente à presença de polifenóis, sendo por isso um possível agente terapêutico para a DH
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Books on the topic "Casson model"

1

Hunter, Clem. The casino model. Cape Town: Tafelberg, 1995.

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Sunter, Clem. The casino model. Cape Town: Tafelberg, 1994.

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University of Arizona. Lunar and Planetary Laboratory. and Ames Research Center, eds. Investigation of the Saturn dust environment from the analysis of energetic charged particle measurements: Final technical report. Tucson, Ariz: Lunar and Planetary Laboratory, 1990.

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What America does right: Lessons from today's most admired corporate role models. New York: Plume, 1994.

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Manfredi, Claudia, ed. Models and analysis of vocal emissions for biomedical applications: 5th International Workshop: December 13-15, 2007, Firenze, Italy. Florence: Firenze University Press, 2007. http://dx.doi.org/10.36253/978-88-5518-027-6.

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The MAVEBA Workshop proceedings, held on a biannual basis, collect the scientific papers presented both as oral and poster contributions, during the conference. The main subjects are: development of theoretical and mechanical models as an aid to the study of main phonatory dysfunctions, as well as the biomedical engineering methods for the analysis of voice signals and images, as a support to clinical diagnosis and classification of vocal pathologies. The Workshop has the sponsorship of: Ente Cassa Risparmio di Firenze, COST Action 2103, Biomedical Signal Processing and Control Journal (Elsevier Eds.), IEEE Biomedical Engineering Soc. Special Issues of International Journals have been, and will be, published, collecting selected papers from the conference.
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1961-, Shields Rob, ed. Lifestyle shopping: The subject of consumption. London: Routledge, 1992.

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Sunter, Clem. The Casino Model. Tafelberg Publishers, 1994.

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PhD, Larry D. Haight. HAIGHT ON CRUSHING CASINO BACCARAT: Profitable Business Model. Independently published, 2020.

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Lee, Eugene Weichih. Advacing a cumulative prospect theory: Model of casino gambling. 2010.

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Haight, Larry Dean. Haight on Crushing Casino Table Games: Profitable Business Model. Independently Published, 2020.

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Book chapters on the topic "Casson model"

1

Sheikh, Nadeem Ahmad, Dennis Ling Chuan Ching, Hamzah Sakidin, and Ilyas Khan. "Fractional Model for the Flow of Casson Nanofluid using the Generalized Fourier’s Law for Heat Transfer." In Proceedings of the 6th International Conference on Fundamental and Applied Sciences, 761–69. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4513-6_67.

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Sigmund, Wolfgang M., and Shu-Hau Hsu. "Cassie–Baxter Model." In Encyclopedia of Membranes, 310–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_1381.

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Sigmund, Wolfgang M., and Shu-Hau Hsu. "Cassie-Baxter Model." In Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-40872-4_1381-4.

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Kumosinski, Thomas F., Eleanor M. Brown, and Harold M. Farrell. "Predicted Energy-Minimized αs1-Casein Working Model." In ACS Symposium Series, 368–90. Washington, DC: American Chemical Society, 1994. http://dx.doi.org/10.1021/bk-1994-0576.ch021.

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Gilli, Eric. "A Messinian Model for Port Miou." In Port Miou and Le Bestouan (Cassis, France), 37–49. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-50192-1_6.

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Williams, Allan P. O. "An Open Systems Model of Key Organisational Elements." In The Rise of Cass Business School, 185–99. London: Palgrave Macmillan UK, 2006. http://dx.doi.org/10.1057/9780230624818_14.

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Ottow, S., and M. Schwertfeger. "Coagulation Under High Hydrostatic Pressure: Polymer Latices as a Model for Casein Dispersions." In Advances in High Pressure Bioscience and Biotechnology, 345–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60196-5_77.

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Niepold, F., P. Dovč, and O. J. Rottmann. "Expression of an α s1,-Casein cDNA-Clone in a Cell-free and Procaryote Model System." In Milk Proteins, 155–57. Heidelberg: Steinkopff, 1989. http://dx.doi.org/10.1007/978-3-642-85373-9_22.

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"ANALYSIS OF CASSON FLUID MODEL FOR BLOOD FLOW IN EXTERNALLY APPLIED MAGNETIC FIELD." In Theoretical and Computational Research in the 21st Century, 261–76. Apple Academic Press, 2014. http://dx.doi.org/10.1201/b17629-18.

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Horne, D. S. "Casein: Micellar Structure (Dual-Binding Model)." In Reference Module in Food Science. Elsevier, 2016. http://dx.doi.org/10.1016/b978-0-08-100596-5.00942-2.

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Conference papers on the topic "Casson model"

1

Wang, Haimin, Xiong Huang, Fan Yang, Wenjuan Cai, and Eryun Chen. "The Dynamic Behavior of Protein Bubble in Casson Fluid." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30151.

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A Casson model is selected to describe the flow behavior of blood. Considering the viscoelasticity of protein film, and the finite deformation of protein bubble under the action of a Casson fluid, a nonlinear equation describing the dynamic behavior for a single protein bubble in blood is developed. The numerical method is used to study the effect of viscoelasticity of the protein film, the characteristic parameters of Casson fluid and the effect of surface tension on the dynamic behavior of protein bubble. The results show that, increasing the viscosity of Casson liquid will accelerate the amplitude decaying of protein bubble wall; the period becomes longer. In the condition that the viscosity of protein film is greater than that of Casson fluid, increasing the viscoelasticity of protein film will also accelerate the amplitude decaying of protein bubble wall. Further more, the greater the viscoelasticity of protein film is, the stronger its load bearing capacity is. Under the consideration of surface tension, the bubble wall will vibrate with higher decaying velocity of amplitude. Without considering the surface tension will lead to a greater relative deformation of protein bubble.
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Silva, Pedro, Emanuel Macêdo, and Fábio Martelli. "A hyperbolic - regularized Casson model for pulsatile blood flow simulation in a rigid artery." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-1545.

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N’Dri, Narcisse A., and Don P. Giddens. "Non-Newtonian Blood Flow in the Right Coronary Artery." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60169.

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Understanding blood flow in the circulatory system and how it affects intimal thickening is important with respect to atherogenesis and also for the design of vascular treatment devices such as stents and arterial grafts. While the assumption of Newtonian blood flow in large arteries is widely accepted by many investigators, questions remain unanswered for blood flow in the coronaries. In this study we investigate Non-Newtonian blood flow behavior in both the right and the left coronaries. We use a commercial code (FIDAP) to compare the Newtonian model to four Non-Newtonian models (Power law, Casson, Carreau and Quemada models) widely used in the literature. The coronary geometries were reconstructed from MRI images of human subjects. We found a significant difference in time average WSS between the power law and the Newtonian models. Also a difference in time average WSS is observed for the Quemada model. On the other hand, No significant difference is observed for the Newtonian, Casson and Carreau models.
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Hyun, Sinjae, and Clement Kleinstreuer. "RBC Distribution in Stenosed Arterial Geometries Using Hematocrit Dependent Viscosity Model (HDVM)." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59948.

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Human blood is a concentrated suspension of mainly red blood cells (RBCs) in plasma and exhibits some non-Newtonian behavior at low shear rates. Traditionally, computational simulations have employed non-Newtonian viscosity models, such as the power-law, Casson, or Quemada model, which are a function of the local shear rate and depend on two to four constant parameters, including the hematocrit. In this study the non-Newtonian behavior of the blood viscosity is expressed as a function of the hematocrit. Specifically, a convection-diffusion equation for the RBCs has been solved, integrated into an apparent viscosity model, and applied to blood flow in a stenosed arterial segment. The computational results provide detailed information of non-Newtonian flow characteristics including distributions of the local hematocrit as well as near-wall hematocrit, shear rate, and viscosity. The new model can be used for more realistic hemodynamics simulations, including calculations of comprehensive physico-biological indicators of sites susceptible to the onset and progression of arterial diseases.
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Cayeux, Eric, and Amare Leulseged. "Characterization of the Rheological Behavior of Drilling Fluids." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19288.

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Abstract It is nowadays well accepted that the steady state rheological behavior of drilling fluids must be modelled by at least three parameters. One of the most often used models is the yield power law, also referred as the Herschel-Bulkley model. Other models have been proposed like the one from Robertson-Stiff, while other industries have used other three-parameter models such as the one from Heinz-Casson. Some studies have been made to compare the degree of agreement between different rheological models and rheometer measurements but in most cases, already published works have only used mechanical rheometers that have a limited number of speeds and precision. For this paper, we have taken measurements with a scientific rheometer in well-controlled conditions of temperature and evaporation, and for relevant shear rates that are representative to normally encountered drilling operation conditions. Care has been made to minimize the effect of thixotropy on measurements, as the shear stress response of drilling fluids depends on its shear history. Measurements have been made at different temperatures, for various drilling fluid systems (both water and oil-based), and with variable levels of solid contents. Also, the shear rate reported by the rheometer itself, is corrected to account for the fact that the rheometer estimates the wall shear rate on the assumption that the tested fluid is Newtonian. A measure of proximity between the measurements and a rheological model is defined, thereby allowing the ranking of different rheological behavior model candidates. Based on the 469 rheograms of various drilling fluids that have been analyzed, it appears that the Heinz-Casson model describes most accurately the rheological behavior of the fluid samples, followed by the model of Carreau, Herschel-Bulkley and Robertson-Stiff, in decreasing order of fidelity.
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Gucuyener, Ismail Hakki, Onur Kazim Gurcay, and Samed Yanik. "A Comprehensive Evaluation of Rheological Models for Non-Aqueous Drilling Fluids." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-78546.

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Abstract This article presents a comparison of Power’s law, Bingham plastic, Casson, Herschel-Bulkley, Unified Herschel-Bulkley, Robertson-Stiff, Gucuyener, Sisko and modified Sisko models using a rheological database of extensive real field and laboratory datasets. In this study, 778 field and laboratory shear rate/shear stress datasets collected from four different sources for oil-based (OBM) and synthetic-based (SBM) muds were evaluated. Rheological measurements were made using Couette coaxial cylinder rotational viscometer such as Fann-35 type viscometers, in the shear rate range of 5.11 to 1022 s−1. This study presents a simplified algorithm, called direct method, to determine the parameters of three-parameter nonlinear models. The direct method enables parameterization of three-parameter nonlinear models using the linear least squares method and significantly improves their performance. In addition, a MATLAB code based on the Gauss-Newton method was created to parameterize the nonlinear models. The nonlinear regression provided the best fit in many cases by calculating negative model parameters making the models physically senseless. The goodness of fit of the models considered here was determined by comparing the resulting mean relative error and residual mean square values. The results of this study showed that the three-parameter models predicted better rheological fit than the two-parameter models for non-aqueous drilling fluids. The fit accuracy of the three-parameter models parameterized using the direct method is very close to that obtained by nonlinear regression. The modified Sisko, Gucuyener and Sisko models gave an excellent match to most of the shear rate-shear stress data sets evaluated in this study.
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Oukhlef, Aimad, Abdlehak Ambari, Ste´phane Champmartin, and Antoine Despeyroux. "Yield Stress Fluid Method to Measure the Pore Size Distribution of a Porous Medium." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30509.

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In this paper a new method is presented in order to determine the pore size distribution in a porous media. This original technique uses the non Newtonian yield-pseudo-plastic rheological properties of some fluid flowing through the porous sample. In a first approximation, the very well-known and simple Carman-Kozeny model for porous media is considered. However, despite the use of such a huge simplification, the analysis of the geometry still remains an interesting problem. Then, the pore size distribution can be obtained from the measurement of the total flow rate as a function of the imposed pressure gradient. Using some yield-pseudo-plastic fluid, the mathematical processing of experimental data should give an insight of the pore-size distribution of the studied porous material. The present technique was successfully tested analytically and numerically for classical pore size distributions such as the Gaussian and the bimodal distributions using Bingham or Casson fluids (the technique was also successfully extended to Herschel-Bulkley fluids but the results are not presented in this paper). The simplicity and the cheapness of this method are also its assets.
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Elhanafy, Ahmed, Yasser Abuouf, Shinichi Ookawara, and Mahmoud Ahmed. "Non-Newtonian Blood Flow in a Diseased Abdominal Aortic Arterial Segment Under the Effect of an External Magnetic Field: A Numerical Study." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-95336.

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Abstract Numerical simulation of blood flow modeling in cardiovascular system has been one of the most efficient tools in understanding and diagnosing many diseases in the recent few decades. Recent studies have been performed to investigate the effect of the external magnetic fields on the biomagnetic fluids such as blood. There are many applications of magnetic field which are closely related to hemodynamics such as the magnetic resonance imaging (MRI) devices, magnetic drug targeting (MDT) and cell separation. These applications have a direct connection with hemodynamics parameters such as the wall shear stress, pressure drop and recirculation zones. In this study, numerical simulation of blood flow in an abdominal aortic aneurysm under an external magnetic field is performed. Blood is considered as a non-Newtonian fluid with shear-thinning properties, in which the blood viscosity is a function of both shear rate and hematocrits using the Casson model. The three-dimensional axisymmetric flow is considered in the arterial segment. Results at different flow conditions such as the strength of the magnetic field, different inlet velocities and different hematocrits are estimated. The results indicate the significant effect of the magnetic strength on the wall shear stress and the pressure drop which reached 200 % and 600 %, respectively.
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Grey, Stephen, and Ye Liu. "A Probabilistic Approach to Tropical Cyclone Modelling." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96245.

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Abstract Tropical cyclones are highly variable and, in many areas of the world, are the main cause of extreme wind and associated waves, surge and current conditions. At a given location, cyclones that cause a significant impact are relatively rare but severe events, which means that the number of historical events for which data are available is often quite small. In addition, the effects, particularly surge, can be relatively localized and affected by the local bathymetry and topography. This causes considerable difficulty in making quantitative predictions of extreme events for design of offshore or coastal structures in areas affected by tropical cyclones. A new probabilistic method has been developed to increase the sample of tropical cyclones by producing 10,000 years of synthetic cyclone tracks with a range of paths, intensities and sizes based on Hall and Jewson [1] and Casson and Coles [2]. From this set of synthetic tracks, those tropical cyclones most likely to affect the site of interest are modelled using time-varying wind fields based on the Holland model [3] with surge, current and waves then modelled using the hydrodynamic model TELEMAC-2D coupled to the SWAN wave model. As it is impractical to model 10,000 years of tropical cyclones, a Gaussian process emulator is employed to relate the resultant conditions to parameters defining the cyclones, such as track position, heading, intensity and radius to maximum wind. The result is a synthesized 10,000 years of cyclone events from which design conditions for a range of return periods can be predicted with a greater degree of certainty than by extrapolating from historical events.
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Pease, Leonard F., Arich J. Fuher, Judith A. Bamberger, Carolyn A. Burns, Richard C. Daniel, and Michael J. Minette. "Is Radioactive Tank Waste a Bingham Fluid?" In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5216.

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Abstract Slurries and sludges across the United States Department of Energy (DOE) complex rank among the most rheologically interesting. Their composition is heterogeneous, spanning a very broad range of particle sizes, densities, and interparticle forces. All exhibit shear thinning, some have yield stresses, and many are thixotropic. Despite the variety, these complex fluids are often represented using the historic Bingham fluid model, which fits higher shear rate data to a simple straight line. The intercept provides a yield stress, which has been a key design parameter in construction of large-scale waste processing facilities. However, many radioactive wastes are simply not Bingham fluids, and this representation extrapolates poorly across low to intermediate shear rates that are characteristic of typical processing conditions. Indeed, processing shear rates as high as 200 1/s, which has been a typical minimum shear rate used in fitting the Bingham fluid model, are seldom encountered in nuclear waste processing. Therefore, more realistic rheological models are necessary to accurately predict waste processing performance. Pacific Northwest National Laboratory (PNNL) recently re-evaluated the rheology of reconstituted Hanford REDOX (reduction-oxidation) process sludge waste against a wide variety of rheological models including the Bingham, Cross, Cross with yield stress, Carreau, biviscous, Herschel-Bulkley (which includes a power law dependence), Casson, and Gay models. They found that all of the models provided a closer fit than the Bingham model and that the biviscous model and Cross with yield stress model were convincing. However, reconstituted Hanford REDOX sludge waste is but one type of DOE waste and a direct contrast, and comparison of these three models against undiluted, unmixed tank waste (actual not simulant) has not been performed previously. Therefore, the purpose of this paper is to evaluate the rheology of actual tank waste with these more accurate rheological models. In this paper, we evaluate select rheological data for slurry samples from Hanford’s AZ-101, AZ-102, and SY-101 waste tanks. In each of these cases, we find that Cross’ model with yield stress and the biviscous model significantly outperform the Bingham fluid model. Furthermore, the AZ-101 data also shows that the shear stress peak at startup significantly exceeds the Bingham yield stress, which is commonly observed in the initial moments of rheological measurements on simulants. Remarkably, Cross’ model may empirically accommodate an initial spike in shear stress at modest shear rates. These are important observations because computational and analytical fluid dynamics simulations rely on rheological constitutive models for accurately and conservatively predicting waste processing performance. These findings suggest the need for better rheological modeling of and validation against radioactive waste.
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Reports on the topic "Casson model"

1

Barberis, Nicholas. A Model of Casino Gambling. Cambridge, MA: National Bureau of Economic Research, May 2009. http://dx.doi.org/10.3386/w14947.

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Posada, Carlos Esteban, and Wilman Gómez. Crecimiento económico y gasto público: un modelo para el caso colombiano. Bogotá, Colombia: Banco de la República, September 2002. http://dx.doi.org/10.32468/be.218.

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Oliveira, Teresa. As Infraestruturas Tecnológicas - Proposta de um Modelo de Avaliação para o caso Português. DINÂMIA'CET-IUL, 2000. http://dx.doi.org/10.7749/dinamiacet-iul.wp.2000.18.

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Cea Esteruelas, María Nereida. Modelo de negocio de la empresa periodística en Internet: El caso de Prisa. Revista Latina de Comunicación Social, 2009. http://dx.doi.org/10.4185/rlcs-64-2009-872-938-950.

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Bartesaghi, Ignacio, Julieta Zelicovich, and Magdalena Bas Vilizzio. La institucionalidad de la política comercial externa: El caso de Uruguay. Inter-American Development Bank, January 2021. http://dx.doi.org/10.18235/0003063.

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El presente estudio realiza un diagnóstico sobre la institucionalidad del proceso de formulación e implementación de la política comercial externa (PCE) de Uruguay. Los objetivos específicos del estudio son (i) caracterizar la organización institucional y la distribución de competencias en el campo de la PCE y las agencias de promoción; (ii) formular un diagnóstico de recursos y capacidades; e (iii) identificar las fortalezas y debilidades del modelo de organización institucional y gestión.
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WHEELER, TIMOTHY A., GREGORY D. WYSS, and FREDERICK T. HARPER. Cassini Spacecraft Uncertainty Analysis Data and Methodology Review and Update/Volume 1: Updated Parameter Uncertainty Models for the Consequence Analysis. Office of Scientific and Technical Information (OSTI), November 2000. http://dx.doi.org/10.2172/769026.

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Deavenport, Roy L., and Matthew J. Gilchrest. Time-Dependent Modeling of Underwater Explosions by Convolving Similitude Source with Bandlimited Impulse from the CASS/GRAB Model. Fort Belvoir, VA: Defense Technical Information Center, June 2015. http://dx.doi.org/10.21236/ada625680.

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Escobar-R., José Fernando, and Carlos Esteban Posada. Dinero, precios, tasa de interés y actividad económica: un modelo del caso colombiano (1984 y 2003). Bogotá, Colombia: Banco de la República, September 2004. http://dx.doi.org/10.32468/be.303.

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Ribeiro, Ana Luísa, and Manuela Magalhães Hill. Insuficiências do Modelo de Capital Humano na Explicação das Diferenças Salariais Entre Géneros: Um Estudo de Caso. DINÂMIA'CET-IUL, 1996. http://dx.doi.org/10.7749/dinamiacet-iul.wp.1996.05.

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Orozco-Gallo, Antonio José, Pavel Vidal-Alejandro, Johana Sanabria-Domínguez, Jaime Andrés Collazos-Rodríguez, and Margaret Guerrero. Indicador coincidente de actividad económica en la recesión pandémica: el caso del Caribe colombiano. Banco de la República, June 2021. http://dx.doi.org/10.32468/dtseru.298.

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Disponer de información temprana sobre la evolución de la actividad económica regional se ha convertido en una prioridad, especialmente como herramienta para evaluar choques a la economía como el ocurrido con la pandemia del Covid-19. En este estudio se construyó un indicador coincidente mensual de actividad económica (IMAE) para la región Caribe, enmarcado en un modelo factorial dinámico y estimado por medio del filtro de Kalman, para el periodo comprendido entre enero de 2001 y diciembre de 2020. El indicador está compuesto por trece variables representativas de las principales actividades económicas de la región. Los resultados muestran que los movimientos experimentados por el indicador en 2020 se comportaron acorde con las medidas de aislamiento aplicadas y con las tasas de incidencia de contagios. Según cifras preliminares, en 2020 la economía del Caribe cayó en un 6,8%, equivalente al resultado nacional. En particular, el desempeño regional se vio afectado al cierre del año por la parálisis en la actividad minera y las nuevas medidas restrictivas.
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