Long-Term Evolution of SCD-1 Satellite Temperatures Based on Comparative Analysis of Telemetric Data Measured in Orbit

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Andreia F. S. Genaro ◽  
Ezio C. Garcia ◽  
Issamu Muraoka ◽  
Kevin E. de Conde
Keyword(s):  
Mathematical Model ◽  
Thermal Behavior ◽  
Heat Dissipation ◽  
Solar Spectrum ◽  
Temperature Sensitive ◽  
Term Evolution ◽  
Optimization Routine ◽  
Experimental Values ◽  
The Mathematical Model

This paper presents results of the research investigation regarding the causes for temperature variation of the SCD-1 (data-collection satellite) by analyzing its thermal behavior evolution throughout 13 years in orbit. SCD-1, the first satellite designed and built in Brazil, was launched in 1993 and is still in operation. A mathematical model has been developed to simulate thermal behavior of SCD-1 in orbit, which was used as a working tool during project design phase, and is presented here. Temperatures of SCD-1 in orbit have been monitored and recorded in the Control and Tracking Center (São José dos Campos, SP, Brazil) since its launch. An analysis carried out at the mission’s beginning showed that all the temperatures were within the ranges predicted in model. Over the years, the battery, which is the most temperature-sensitive equipment in the satellite, had an increase in temperature approaching upper limit. A method has been developed to investigate the causes of this upswing in which an optimization routine linked to the mathematical model corrects a selected set of parameters in order to adjust the theoretical temperature values to the experimental values. By means of this methodology, data from SCD-1 were analyzed from 1995 to 2005 period and it was concluded that the rise in temperature was caused by an increase in internal battery heat dissipation and absorptivity in solar spectrum of some of the external satellite shielding, both consequences of a long-term degradation.

Modelling and Simulation of NO2 Dispersion Phenomenon in Atmosphere by Analytical-Experimental Methods

2008 ◽  
Vol 59 (10) ◽  
Author(s):  
Delia Perju ◽  
Harieta Pirlea ◽  
Gabriela-Alina Brusturean ◽  
Dana Silaghi-Perju ◽  
Sorin Marinescu
Keyword(s):  
Mathematical Model ◽  
Nitrogen Dioxide ◽  
Modeling And Simulation ◽  
Human Health ◽  
Experimental Methods ◽  
Negative Effects ◽  
Real Situation ◽  
Experimental Values ◽  
The Mathematical Model

The European laws and recently the Romanian ones impose more and more strict norms to the large nitrogen dioxide polluters. They are obligated to continuously improve the installations and products so that they limit and reduce the nitrogen dioxide pollution, because it has negative effects on the human health and environment. In this paper are presented these researches made within a case study for the Timi�oara municipality, regarding the modeling and simulation of the nitrogen dioxide dispersion phenomenon coming from various sources in atmosphere with the help of analytical-experimental methods. The mathematical model resulting from these researches is accurately enough to describe the real situation. This was confirmed by comparing the results obtained based on the model with real experimental values.

scholarly journals Mathematical Model of the Piped Vehicle Motion in Piped Hydraulic Transportation of Tube-Contained Raw Material

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Yongye Li ◽  
Xihuan Sun
Keyword(s):  
Mathematical Model ◽  
Transportation Cost ◽  
Raw Material ◽  
Maximum Relative Error ◽  
Transportation Energy ◽  
Core Components ◽  
Vehicle Motion ◽  
Motion Characteristics ◽  
Experimental Values ◽  
The Mathematical Model

The piped hydraulic transportation of tube-contained raw material is an emerging technique for transporting materials. In this technique, the piped vehicle is one of the core components, and its motion characteristics directly determine the transportation energy consumption and the transportation cost of this technique. To study the motion characteristics of the piped vehicle, the force of the piped vehicle was analyzed from the mechanical perspective in this paper. On the assumption that the piped vehicle moved steadily and it had sufficient stiffness, the mathematical model of the piped vehicle motion was established in the turbulent flow according to the stress characteristics of the piped vehicle and the factors influencing its motion characteristics, and then the mathematical model was tested by experiments. The findings show that the calculated values of the velocities of the piped vehicle were identical to the experimental values with changes in various influencing factors. When the flow discharge, the diameter or length of the piped vehicle increased, or the mass of transported material decreased, the velocity of the piped vehicle increased. The maximum relative error did not exceed 9.47%, which proved that the mathematical model of the piped vehicle motion was rational. The results can provide theoretical basis to improve the structure of the piped vehicle and the piped hydraulic transportation technique of tube-contained raw material.

scholarly journals The Solution of a Mathematical Model for Dengue Fever Transmission Using Differential Transformation Method

2019 ◽  
pp. 82-87
Author(s):  
Felix Yakubu Eguda ◽  
Andrawus James ◽  
Sunday Babuba
Keyword(s):  
Mathematical Model ◽  
Dengue Fever ◽  
Transformation Method ◽  
Vital Role ◽  
Differential Transformation Method ◽  
Linear Ordinary Differential Equations ◽  
Differential Transformation ◽  
Long Term Behavior ◽  
The Mathematical Model

Differential Transformation Method (DTM) is a very effective tool for solving linear and non-linear ordinary differential equations. This paper uses DTM to solve the mathematical model for the dynamics of Dengue fever in a population. The graphical profiles for human population are obtained using Maple software. The solution profiles give the long term behavior of Dengue fever model which shows that treatment plays a vital role in reducing the disease burden in a population.

The Mathematical Modeling Stages of Combining the Carriage of Goods for Indefinite, Fuzzy and Stochastic Parameters

2020 ◽  
Vol 12 (7) ◽  
Author(s):  
Sergiy Kotenko ◽  
◽  
Vitalii Nitsenko ◽  
Iryna Hanzhurenko ◽  
Valerii Havrysh ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Radical Change ◽  
Short Term ◽  
Best Value ◽  
Stochastic Parameters ◽  
Mode Of Transportation ◽  
Cargo Transportation ◽  
Risk Parameters ◽  
The Mathematical Model

Combined cargo transportation in Ukraine is characterized by the presence of uncertain risks. The aim of the article was to propose a mathematical model for choosing the mode of transportation that would correspond to the best value of the integral objective function in the presence of fuzzy, stochastic and uncertain risk parameters. The efficiency of the mathematical model provided the possibility of forming not only long-term forecasts that require significant time, but also short-term forecasts in real time. This allows to quickly change routes and conditions of transportation. Practical testing of the mathematical model revealed the assimilating nature of some uncertain risks. The results of the analysis are given in the article. The realization of such a risk leads to a radical change in all conditions of transportation. Long-term forecasts allow to predict new routes and conditions of transportation.

Study of Maneuverability of Container Ship With Nonlinear and Roll-Coupled Effects by Numerical Simulations Using RANSE-Based Solver

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
R. Rajita Shenoi ◽  
P. Krishnankutty ◽  
R. Panneer Selvam
Keyword(s):  
Mathematical Model ◽  
High Speed ◽  
Stokes Equations ◽  
Navier Stokes ◽  
Container Ship ◽  
Navier Stokes Equations ◽  
Hydrodynamic Derivatives ◽  
Computational Fluid Dynamics Cfd ◽  
Experimental Values ◽  
The Mathematical Model

The examination of maneuvering qualities of a ship is necessary to ensure its navigational safety and prediction of trajectory. The study of maneuverability of a ship is a three-step process, which involves selection of a suitable mathematical model, estimation of the hydrodynamic derivatives occurring in the equation of motion, and simulation of the standard maneuvering tests to determine its maneuvering qualities. This paper reports the maneuvering studies made on a container ship model (S175). The mathematical model proposed by Son and Nomoto (1981, “On Coupled Motion of Steering and Rolling of a High Speed Container Ship,” J. Soc. Nav. Arch. Jpn., 150, pp. 73–83) suitable for the nonlinear roll-coupled steering model for high-speed container ships is considered here. The hydrodynamic derivatives are determined by numerically simulating the planar motion mechanism (PMM) tests in pure yaw and combined sway–yaw mode using an Reynolds-Averaged Navier–Stokes Equations (RANSE)-based computational fluid dynamics (CFD) solver. The tests are repeated with the model inclined at different heel angles to obtain the roll-coupled derivatives. Standard definitive maneuvers like turning tests at rudder angle, 35 deg and 20 deg/20 deg zig-zag maneuvers are simulated using the numerically obtained derivatives and are compared with those obtained using experimental values.

Thickness of Thin-Layer Liquid Film on a Rotating Roll and its Measurement by the X-Ray Backscattering Technique

1977 ◽  
Vol 47 (5) ◽  
pp. 311-316
Author(s):  
Nelson P. C. Chao
Keyword(s):  
Mathematical Model ◽  
Film Thickness ◽  
Thin Layer ◽  
Liquid Film ◽  
Liquid Viscosity ◽  
Roll Speed ◽  
Steady State Condition ◽  
X Ray ◽  
Experimental Values ◽  
The Mathematical Model

A mathematical model is provided to describe the thin-layer liquid film thickness on the surface of a rotating roll which is partially immersed in a liquid bath. The equation expresses the initial film thickness in terms of roll speed and immersion depth as well as liquid viscosity, surface tension, and density. The roll speed and liquid viscosity are the two dominant parameters affecting the film thickness. An x-ray backscattering technique was used to measure the film thickness. An important feature of this technique is that it permits the measurements to be carried out under a steady-state condition without disturbing the liquid film and the roll. The principle of a portable instrument and the technique involved in the measurements are described. Within the scope of the present investigation with Newtonian liquid and laminar flow, the experimental values of film thickness determined by the x-ray backscattering technique agreed very well with the theoretical values predicted by the mathematical model.

scholarly journals Strategic Factors in the Capital Structure of the Services and Communication Sectors in Mexico

2015 ◽  
pp. 33-50
Author(s):  
Juan Gaytán Cortés ◽  
Joel Bonales Valencia ◽  
Juan Antonio Vargas Barraza
Keyword(s):  
Mathematical Model ◽  
Empirical Study ◽  
Capital Structure ◽  
Stock Exchange ◽  
Theoretical Framework ◽  
Strategic Factors ◽  
Communication Sector ◽  
The Mathematical Model ◽  
The Capital Structure

The purpose of this research was to identify the strategic factors of the country and the companies, to incorporate long term debt in the capital structure of the companies of services and the communication sector that they quoted on the Mexican Stock Exchange in the periods 2000-2012.The mathematical model and the factors used in this empirical study were used in the investigations that were analyzed in the theoretical framework.

Modeling Thermal Behavior of System-in-Package with Dynamic Compact Model

2005 ◽  
Vol 2 (1) ◽  
pp. 64-71
Author(s):  
Kimmo Kaija ◽  
Pekka Heino ◽  
Eero O. Ristolainen
Keyword(s):  
Thermal Behavior ◽  
Thermal Load ◽  
Thermal Model ◽  
Heat Dissipation ◽  
Effective Surface ◽  
Two Phase ◽  
Surface Areas ◽  
Optimization Routine ◽  
Phase Optimization ◽  
Thermal Simulations

Integrating more functionality into smaller size increases the heat dissipation density and emphasizes the need for thermal simulations and accurate thermal models. With a compact thermal model (CTM) the dynamic and steady state thermal behavior of a package with several heat dissipating dice can be modeled. The optimization of the model's parameters requires a properly defined cost function. In this paper a two-phase optimization routine was used to find simultaneously good capacitance and resistance values. The accuracy of the model was improved when effective surface areas defined the convections of a CTM. Parameter optimization in time domain, for variable thermal load and nonlinear system, was tested and found accurate, but time consuming.

scholarly journals Utilization of Numerical Techniques to Predict the Thermal Behavior of Wood Column Subjected to Fire. Part A: Using Finite Element Methods to Develop Mathematical Model for Wood Column

2006 ◽  
Vol 306-308 ◽  
pp. 577-582
Author(s):  
Mohamed ElShayeb ◽  
Abdul Rashid Ab Malik ◽  
Fazril Ideris ◽  
Zolman Hari ◽  
Norhaida Ab Razak ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Finite Element ◽  
Thermal Behavior ◽  
Temperature History ◽  
Two Dimensional ◽  
Numerical Techniques ◽  
Materials Properties ◽  
The Mathematical Model ◽  
Develop Mathematical Model ◽  
Wood Columns

The mathematical model to predict the temperature history for wood column is needed in order to determine its fire resistance when exposed to fire. In this paper, an intelligent methodology called Finite Element Method (FEM) of performing analysis for the square and circular wood columns by virtually or artificially developing a temperature history mathematical model. Numerical simulation model has been developed for the wood column by using two-dimensional mathematical model. The two-dimensional mathematical model was developed by using Galerkin’s Weighted Residual technique. This model focuses on the regional material of the wood column for describing its thermal behavior. When the temperature history in a column and relevant materials properties are known, the strength of the column can be calculated at any time during fire. Therefore, the development of the temperature history mathematical model is a must before any further study to be carried out for the wood columns. The flow of convection will result in minimal increase in the rate of heat energy reaching the column core. The analysis shows that the temperature of the column increases with respect to the duration of exposure to fire.

Analisis Model Matematika Penyebaran Penyakit Demam Berdarah Dengue dengan Treatment

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Mohammad Soleh ◽  
Zulpikar Zulpikar ◽  
Ari Pani Desvina
Keyword(s):  
Mathematical Model ◽  
Dengue Virus ◽  
Equilibrium State ◽  
Human Body ◽  
Hemorrhagic Fever ◽  
Asymptotically Stable ◽  
And Control ◽  
The Mathematical Model ◽  
Endemic Equilibrium State

Demam Berdarah Dengue (DBD) adalah penyakit yang disebabkan oleh virus Dengue yang ditularkan ke tubuh manusia melalui gigitan nyamuk Aedes aegypti. Pasien yang terinfeksi virus memerlukan perawatan. Perawatan adalah metode yang penting dan efektif untuk mencegah dan mengendalikan penyebaran penyakit. Dalam makalah ini, kami membahas tentang analisis model matematika dari penularan demam berdarah dengan pengobatan. Studi ini meneliti model Esteva-Vargas yang dimodifikasi menggunakan pengobatan fungsi Wang. Hasil penelitian mengungkapkan bahwa ada satu kondisi kesetimbangan dari endemisitas penyakit. Jika pengobatan dilakukan dengan k<0,000186 kondisi kesetimbangan endemik penyakit stabil asimptotik, dan dalam jangka panjang akan selalu terjadi penyebaran penyakit. Sedangkan jika pengobatan dengan k≥0,000186 keadaan kesetimbangan endemik penyakit tidak stabil asimptotik, dan dalam jangka panjang akan bebas dari penyakit.   Dengue Hemorrhagic Fever (DHF) is a disease caused by Dengue virus that is transmitted to human body through AedesAegypti mosquito bites. Patients infected with the virus require treatment. treatment is an important and effective method to prevent and control the spread of disease. In this paper discusses about the mathematical model analysisof transmission dengue fever with treatment.This study examined the modified Esteva-Vargas model using the treatment of the Wang function. The results obtained, there is one disease endemic equilibrium state. If the treatment with k<0,000186then diseaseendemic equilibrium state is asymptotically stable, and in the long term will always happen deployment disease. Whereas if the treatment with k≥0,000186 then diseaseendemic equilibrium state is not asymptotically stable, and in the long term will always happen freedisease.

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