scholarly journals A regression evaluation of thermal continentality

Geografie ◽  
2009 ◽  
Vol 114 (4) ◽  
pp. 350-362 ◽  
Author(s):  
Kateřina Mikolášková
Keyword(s):  
Temperature Distribution ◽  
Regression Function ◽  
Point Of View ◽  
Daily Temperature

This paper considers climate continentality from the point of view of temperature. Primary indices, developed for climate continentality, are presented and compared and a proposal is made for a new index. The newly proposed index is based on daily temperature means and considers the influence of latitude in the Earth’s temperature distribution. The regression function was selected to best reflect the dependence of annual temperature mean on latitude. Several possible indices are evaluated.

scholarly journals Influence of Oxidant Agent on Syngas Composition: Gasification of Hazelnut Shells through an Updraft Reactor

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 102 ◽  
Author(s):  
Francesco Gallucci ◽  
Raffaele Liberatore ◽  
Luca Sapegno ◽  
Edoardo Volponi ◽  
Paolo Venturini ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Energy Flow ◽  
Steam Gasification ◽  
Point Of View ◽  
Waste Biomass ◽  
Heating Value ◽  
Cold Gas Efficiency ◽  
Gas Efficiency ◽  
University Of Rome ◽  
Hazelnut Shells

This work aims to study the influence of an oxidant agent on syngas quality. A series of tests using air and steam as oxidant agents have been performed and the results compared with those of a pyrolysis test used as a reference. Tests were carried out at Sapienza University of Rome, using an updraft reactor. The reactor was fed with hazelnut shells, waste biomass commonly available in some parts of Italy. Temperature distribution, syngas composition and heating value, and producible energy were measured. Air and steam gasification tests produced about the same amount of syngas flow, but with a different quality. The energy flow in air gasification had the smallest measurement during the experiments. On the contrary, steam gasification produced a syngas flow with higher quality (13.1 MJ/Nm3), leading to the best values of energy flow (about 5.4 MJ/s vs. 3.3 MJ/s in the case of air gasification). From the cold gas efficiency point of view, steam gasification is still the best solution, even considering the effect of the enthalpy associated with the steam injected within the gasification reactor.

Study on Temperature Distribution in the Jointing Fittings for Polyethylene Natural Gas Pipes

2015 ◽  
Vol 736 ◽  
pp. 103-109
Author(s):  
Eugen Avrigean ◽  
Laszlo Jozsef Hunyadi
Keyword(s):  
Temperature Distribution ◽  
Natural Gas ◽  
Point Of View ◽  
Experimental Point ◽  
Gas Distribution ◽  
Polyethylene Pipes

The present paper aims to approach from a theoretical and experimental point of view an important topic in terms ofoperational safety of the polyethylene pipes used in natural gas distribution.

scholarly journals Influence of temperature distribution on circular saw blade natural frequencies during cutting

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 1076-1090
Author(s):  
Miran Merhar
Keyword(s):  
Temperature Distribution ◽  
Temperature Difference ◽  
Natural Frequencies ◽  
Point Of View ◽  
Cutting Edge ◽  
Circular Saw ◽  
Rate Of Increase ◽  
Circular Saw Blade ◽  
Saw Blade ◽  
Experimental Findings

When cutting wood, heat is generated in the cutting zone and in the gullet due to the friction between the teeth of the blade and the material that is being cut. Since the wood is hydrophilic, the saw blade cannot be cooled with liquids, as is usual when cutting metals. The only way to remove the heat from the source is by conductivity to the centre of the saw blade and then by convection into the air. This research presents an analytical model to calculate the natural frequencies of circular saw blades exposed to different temperature distributions. The model confirmed experimental findings of many authors, i.e. the heating of the saw blade cutting edge reduces its natural frequencies, the rate of the reduction depending on the temperature difference between the cutting edge and the rest of the blade and on the shape of the temperature distribution. In contrast, heating the centre of the saw blade increases its natural frequencies, the rate of increase depending on the temperature difference and the shape of the temperature distribution. With the presented model, the most favourable temperature distribution can be calculated from the point of view of the critical saw blade speed, which can be achieved by heating or cooling the centre of the saw blade.

scholarly journals New Regression models for Estimation daily temperature of Karachi and its Neural Network analysis

2021 ◽  
Keyword(s):  
Neural Network ◽  
Temperature Distribution ◽  
Regression Models ◽  
Daily Temperature ◽  
Good Prediction ◽  
Distribution Models ◽  
Average Daily Temperature ◽  
Non Linear ◽  
Artificial Neural Network Ann

<p>This study presents the determination of the average daily temperature distribution for Karachi city. Artificial Neural Network (ANN) has been used to predict the average daily temperature of 2018, 2019, and 2020. Two regression models (linear and non-linear) were also developed. These models are based on relative humidity and dew points. Karachi's six-year environmental datasets were used for the case study location and to establish temperature distribution models. In ANN three years, temperature data (2015-2017) was used to train and validate the NN model. The same data was used to find the regression coefficients of each model. Both models and NN are then used to estimate the average daily temperature of years 2018-2020. The statistical errors are also calculated for comparison and to evaluate the performance of both models; an excellent agreement was found between recorded and ANN estimates. Both regression models predict average daily temperature with reasonable uncertainties. However, the non-linear regression model predictions are better. The results show that the models provide a good prediction of temperature distribution.</p>

scholarly journals ROBUSTIFIED EXPECTED MAXIMUM PRODUCTION FRONTIERS

2020 ◽  
pp. 1-42
Author(s):  
Abdelaati Daouia ◽  
Jean-Pierre Florens ◽  
Léopold Simar
Keyword(s):  
Asymptotic Properties ◽  
Main Tool ◽  
Regression Function ◽  
Point Of View ◽  
Production Functions ◽  
Maximum Output ◽  
Maximum Production ◽  
Theory Point ◽  
Regression Error ◽  
Delivery Services

The aim of this paper is to construct a robust nonparametric estimator for the production frontier. We study this problem under a regression model with one-sided errors, where the regression function defines the achievable maximum output, for a given level of inputs-usage, and the regression error defines the inefficiency term. The main tool is a concept of partial regression boundary defined as a special probability-weighted moment. This concept motivates a robustified unconditional alternative to the pioneering class of nonparametric conditional expected maximum production functions. We prove that both the resulting benchmark partial frontier and its estimator share the desirable monotonicity of the true full frontier. We derive the asymptotic properties of the partial and full frontier estimators, and unravel their behavior from a robustness theory point of view. We provide numerical illustrations and Monte Carlo evidence that the presented concept of unconditional expected maximum production functions is more efficient and reliable in filtering out noise than the original conditional version. The methodology is very easy and fast to implement. Its usefulness is discussed through two concrete datasets from the sector of Delivery Services, where outliers are likely to affect the traditional conditional approach.

Concrete Structures Restoration from the Fire Safety Point of View

2013 ◽  
Vol 688 ◽  
pp. 113-119 ◽  
Author(s):  
Isabela Bradáčová ◽  
Petr Kučera
Keyword(s):  
Critical Temperature ◽  
Temperature Distribution ◽  
Concrete Structures ◽  
Concrete Cover ◽  
Point Of View ◽  
Engineering Practice ◽  
Cover Layer ◽  
Subsequent Determination ◽  
Bearing Structure

The need of concrete structures restoration in order to ensure their fire resistance can, in engineering practice, occur for reasons of damage to the structure by fire (spalling of concrete cover layer) or by the failure to cover the load-bearing structure during construction. The paper is devoted to the evaluation of the structure cover of the evaluated structure, the determination of temperature distribution in the structure with consideration to the choice of probable fire scenario, subsequent determination of critical temperature of the structure and the optimization of possible methods of the restoration of damaged or wrongly made constructions.

Theoretical considerations of the temperature distribution in a channel bounded by two co-axial circular pipes

1964 ◽  
Vol 60 (3) ◽  
pp. 653-656 ◽  
Author(s):  
Krishna Lal
Keyword(s):  
Temperature Distribution ◽  
Incompressible Fluid ◽  
Viscous Incompressible Fluid ◽  
Point Of View ◽  
Circular Pipe ◽  
Oscillatory Function ◽  
Heat Addition ◽  
Temperature Distributions ◽  
Circular Pipes ◽  
Theoretical Considerations

Solutions for the temperature distribution in a circular pipe have been given by various authors, notably Gretz, Nusselt, Goldstein; all these are cited in (1), section 266. I have already considered in one paper the temperature distribution in a circular pipe when viscous incompressible fluid is flowing through the pipe and rate of heat addition is an oscillatory function of time. In this paper expressions for the temperature distributions are derived when viscous incompressible fluid is flowing through the channel, the dissipation due to friction is neglected and the rate of heat addition is an exponential function of time. From the engineering point of view this situation has some importance.

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

How a sheperd guides a sheep herd?

1984 ◽  
Vol 75 ◽  
pp. 331-337
Author(s):  
Richard Greenberg
Keyword(s):  
Point Of View ◽  
Single Ring ◽  
Damping Effects ◽  
Ring Particle

ABSTRACTThe mechanism by which a shepherd satellite exerts a confining torque on a ring is considered from the point of view of a single ring particle. It is still not clear how one might most meaningfully include damping effects and other collisional processes into this type of approach to the problem.

The growth of mica polytypes as studied by conventional and high-resolution TEM

1983 ◽  
Vol 41 ◽  
pp. 174-177
Author(s):  
A. Baronnet ◽  
M. Amouric
Keyword(s):  
Water Pressure ◽  
Point Of View ◽  
Temperature Fields ◽  
Natural Occurrence ◽  
Growth Mechanisms ◽  
Long Period ◽  
High Resolution Tem ◽  
Layer Stacking ◽  
Experimental Works ◽  
Potential Use

The origin of mica polytypes has long been a challenging problem for crystal- lographers, mineralogists and petrologists. From the petrological point of view, interest in this field arose from the potential use of layer stacking data to furnish further informations about equilibrium and/or kinetic conditions prevailing during the crystallization of the widespread mica-bearing rocks. From the compilation of previous experimental works dealing with the occurrence domains of the various mica "polymorphs" (1Mr, 1M, 2M1, 2M2 and 3T) within water-pressure vs temperature fields, it became clear that most of these modifications should be considered as metastable for a fixed mica species. Furthermore, the natural occurrence of long-period (or complex) polytypes could not be accounted for by phase considerations. This highlighted the need of a more detailed kinetic approach of the problem and, in particular, of the role growth mechanisms of basal faces could play in this crystallographic phenomenon.

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