Parametric Study for the Steady-State Equilibrium of a Towfish

2015 ◽  
Vol 81 (2) ◽  
pp. 231-240 ◽  
Author(s):  
Alessandro Cammarata ◽  
Rosario Sinatra
Keyword(s):  
Steady State ◽  
Parametric Study ◽  
State Equilibrium

Evidence for a nuclear passage of nascent polypeptide-associated complex subunits in yeast

2001 ◽  
Vol 114 (14) ◽  
pp. 2641-2648
Author(s):  
Jacqueline Franke ◽  
Barbara Reimann ◽  
Enno Hartmann ◽  
Matthias Köhler ◽  
Brigitte Wiedmann
Keyword(s):  
Transcriptional Regulation ◽  
Steady State ◽  
Fluorescence Microscopy ◽  
Nuclear Import ◽  
Cell Fractionation ◽  
Active Process ◽  
Ribosomal Subunits ◽  
State Equilibrium ◽  
Nascent Polypeptide ◽  
Ribosome Binding

The nascent polypeptide-associated complex (NAC) has been found quantitatively associated with ribosomes in the cytosol by means of cell fractionation or fluorescence microscopy. There have been reports, however, that single NAC subunits may be involved in transcriptional regulation. We reasoned that the cytosolic location might only reflect a steady state equilibrium and therefore investigated the yeast NAC proteins for their ability to enter the nucleus. We found that single subunits of yeast NAC can indeed be transported into the nucleus and that this transport is an active process depending on different nuclear import factors. Translocation into the nucleus was only observed when binding to ribosomes was inhibited. We identified a domain of the ribosome-binding NAC subunit essential for nuclear import via the importin Kap123p/Pse1p-dependent import route. We hypothesize that newly translated NAC proteins travel into the nucleus to bind stoichiometrically to ribosomal subunits and then leave the nucleus together with these subunits to concentrate in the cytosol.

scholarly journals THE RICH AND THE POOR IN A SIMPLE MODEL OF GROWTH AND DISTRIBUTION

2016 ◽  
Vol 20 (7) ◽  
pp. 1934-1952 ◽  
Author(s):  
Kirill Borissov
Keyword(s):  
Economic Growth ◽  
Steady State ◽  
Simple Model ◽  
Disposable Income ◽  
State Equilibrium ◽  
Positional Concerns ◽  
The Poor ◽  
The Rich ◽  
Intertemporal Equilibrium ◽  
Unique Steady State

We consider a model of economic growth with altruistic agents who care about their consumption and the disposable income of their offspring. The agents' consumption and the offspring's disposable income are subject to positional concerns. We show that, if the measure of consumption-related positional concerns is sufficiently low and/or the measure of offspring-related positional concerns is sufficiently high, then there is a unique steady-state equilibrium, which is characterized by perfect income and wealth equality, and all intertemporal equilibira converge to it. Otherwise, in steady-state equilibria, the population splits into two classes, the rich and the poor; under this scenario, in any intertemporal equilibrium, all capital is eventually owned by the households that were the wealthiest from the outset and all other households become poor.

scholarly journals The Influence of Burial Depth and Soil Thermal Conductivity on Heat Transfer in Buried CO2 Pipelines for CCS: A Parametric Study

2020 ◽  
Author(s):  
Babafemi Olugunwa ◽  
Julia Race ◽  
Tahsin Tezdogan
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Steady State ◽  
Thermal Resistance ◽  
Parametric Study ◽  
Flow Assurance ◽  
Burial Depth ◽  
Soil Thermal Conductivity ◽  
Dense Phase ◽  
Pipeline Transportation

Abstract Pipeline heat transfer modelling of buried pipelines is integral to the design and operation of onshore pipelines to aid the reduction of flow assurance challenges such as carbon dioxide (CO2) gas hydrate formation during pipeline transportation of dense phase CO2 in carbon capture and storage (CCS) applications. In CO2 pipelines for CCS, there are still challenges and gaps in knowledge in the pipeline transportation of supercritical CO2 due to its unique thermophysical properties as a single, dense phase liquid above its critical point. Although the design and operation of pipelines for bulk fluid transport is well established, the design stage is incomplete without the heat transfer calculations as part of the steady state hydraulic and flow assurance design stages. This paper investigates the steady state heat transfer in a buried onshore dense phase CO2 pipelines analytically using the conduction shape factor and thermal resistance method to evaluate for the heat loss from an uninsulated pipeline. A parametric study that critically analyses the effect of variation in pipeline burial depth and soil thermal conductivity on the heat transfer rate, soil thermal resistance and the overall heat transfer coefficient (OHTC) is investigated. This is done using a one-dimensional heat conduction model at constant temperature of the dense phase CO2 fluid. The results presented show that the influence of soil thermal conductivity and pipeline burial depth on the rate of heat transfer, soil thermal resistance and OHTC is dependent on the average constant ambient temperature in buried dense phase CO2 onshore pipelines. Modelling results show that there are significant effects of the ambient natural convection on the soil temperature distribution which creates a thermal influence region in the soil along the pipeline that cannot be ignored in the steady state modelling and as such should be modelled as a conjugate heat transfer problem during pipeline design.

scholarly journals Granulocytopoiesis. II. Emergence and Pattern of Labeling of Neutrophilic Granulocytes in Humans

Blood ◽  
1964 ◽  
Vol 24 (6) ◽  
pp. 683-700 ◽  
Author(s):  
T. M. FLIEDNER ◽  
E. P. CRONKITE ◽  
S. Å. KILLMANN ◽  
V. P. BOND
Keyword(s):  
Steady State ◽  
Peripheral Blood ◽  
Bacterial Infections ◽  
Neutrophilic Granulocytes ◽  
Constant Input ◽  
State Equilibrium ◽  
Nuclear Maturation ◽  
Myelocytic Leukemia ◽  
Sample Interval ◽  
Cytoplasmic Maturation

Abstract 1. Following administration of H3-thymidine to 15 patients with a variety of hemopoietic conditions, the emergence and the pattern of labeling of neutrophilic granulocytes were studied in peripheral blood leukocytic concentrates. The hematologic diagnosis included five in which the hemopoiesis appeared to be in a steady state equilibrium at the time of study, three with various types of leukemia, one with lymphosarcoma, two with multiple myeloma, one with myelofibrosis, two with pernicious anemia (once before and once after therapy) and two with bacterial infections. 2. The emergence time of neutrophilic segmented granulocytes (time from H3-thymidine injection to the first appearance of labeled segmented forms in the peripheral blood) was found to vary in steady state equilibrium from 96 to 144 hours. It was shortened to 48 hours in two instances with bacterial infection. This was interpreted as indicating a faster than normal nuclear maturation with normal or delayed cytoplasmic maturation (dissociation in nuclear and cytoplasmic maturation). 3. The number of segments of neutrophilic granulocytes was found to be unrelated to cell age as had been hypothesized by Arneth many years ago. However, bandforms were found in the circulation about 24 hours earlier than segmented forms, suggesting that they are younger and that some are acceptable to the blood while others continue to mature to segmented forms. Pelgeroid cells with round or bilobed nuclei found in one case of subleukemic myelocytic leukemia were found to emerge simultaneously 132 hours after H3-thymidine injection. This suggests that both types are identical in their degree of maturation. Thus the cells with round nuclei are not band forms but result possibly from a delayed nuclear maturation. 4. In patients studied for at least 2 weeks, characteristic undulations of the labeling indices of the segmented granulocytes were found. If the sampling intervals were 24 hours, peaks were found 6 days apart, the second peak being about half of the labeling index of the first. If the sample interval was shorter, a finer structure was observed with undulations showing peak intervals of 2-3 days. Although the significance is obscure at present, the constancy of the findings suggest that there may be a constant input of cells with the index of labeling varying due to some synchrony of the precursor population(s). Alternative explanations are discussed.

Enhancement of Diffusion Due to Irradiation

1965 ◽  
Vol 20 (4) ◽  
pp. 527-532 ◽  
Author(s):  
W. Schule
Keyword(s):  
Activation Energy ◽  
Steady State ◽  
Production Rate ◽  
Point Defects ◽  
Aluminium Alloys ◽  
Annealed Specimen ◽  
Fast Neutrons ◽  
State Equilibrium

It is shown that in α-copper-aluminium alloys interstitials are able to change sites with the copper and aluminium atoms by diffusion. The activation energy for migration of interstitials could be determined to be 0.82 eV. In a well annealed specimen the interstitials and vacancies annihilate nearly exclusively by pair recombination. The production rate of free interstitials is found to be slightly larger than that of free vacancies during an irradiation with fast neutrons. The excess interstitials, which are supposed to originate from depleted zones, form clusters acting as sinks, at which essentially interstitials anneal out. Due to these sinks another steady state equilibrium („fixed vacancy case“) among point defects and sinks is achieved by repeated irradiations.

The Mechanics of a Helically Wrapped Thin-Shell Supported by an Externally Pressurized Air Cushion

2002 ◽  
Author(s):  
Sinan Mu¨ftu¨
Keyword(s):  
Steady State ◽  
Thin Shell ◽  
Previous Model ◽  
Fluid Structure Interactions ◽  
Oblique Angle ◽  
Equilibrium Equations ◽  
State Equilibrium ◽  
Air Cushion ◽  
The Web

The mechanics of the fluid structure interactions between a flexible web and an externally pressurized air cushion is modeled. The web is wrapped around the porous cylindrical air-reverser at an oblique angle. The air reverser supplies pressurized air into the web/air-reverser clearance. This model is an extension of a previous model and allows the web to be wrapped around the cylinder in a helical fashion. The geometric relations are based on Rongen’s work (1994) and steady state equilibrium equations are developed based on the work of Mu¨ftu¨ and Cole (1999). This paper describes the theory. A case study is presented.

A Numerical Study of Ammonia-Water Absorption Into a Constrained Microscale Film

2008 ◽  
Author(s):  
Ruander Cardenas ◽  
Vinod Narayanan
Keyword(s):  
Weak Solution ◽  
Steady State ◽  
Parametric Study ◽  
Numerical Study ◽  
Porous Plate ◽  
Coolant Fluid ◽  
Geometrical Parameters ◽  
Ammonia Vapor ◽  
Ammonia Water ◽  
Vapor Distribution

A one-dimensional, steady state, semi-empirical model of an ammonia-water microscale bubble absorber is presented. The geometry consists of a microchannel through which a solution of ammonia-water flows. Ammonia vapor is injected through one of the walls of the channel. A counter flowing coolant solution removes the heat generated due to absorption from the opposite wall. The 1-D, steady state species and energy transport equations are solved to yield, along the length of the channel, concentration and temperature profiles of the solution stream and the temperature profile of the coolant fluid stream. Values for the overall heat transfer coefficient from experimental results are used in this model. A parametric study of fluid and geometrical parameters based on the model is presented. The varied fluidic parameters include the mass flow rates of the weak solution, coolant, and vapor, the inlet coolant temperature, and the weak solution concentration. Two variations of the vapor distribution that resulted from a geometrical variation of the porous plate are considered: (a) variation in length of the non-porous section, and (b) variation in the number of intermittent sections in which there was no injection of vapor. Trends of the parametric study were consistent with those of experiments. A salient result of the parametric study indicates that incomplete absorption occurs with an increase in weak solution flow rate due to the decrease in residence time within the microchannel for absorption. At a specific fixed flow condition, a single porous section followed by a non-porous section provides the optimal vapor distribution for absorption within the channel. The length of this non-porous section for optimal absorption within the channel is also determined using the model.

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