scholarly journals Population dynamics of Musca domestica (Diptera: Muscidae): experimental and theoretical studies at different temperatures

2004 ◽  
Vol 47 (5) ◽  
pp. 775-783 ◽  
Author(s):  
Carina Aparecida Tardelli ◽  
Wesley Augusto Conde Godoy ◽  
Paulo Fernando Arruda Mancera
Keyword(s):  
Population Dynamics ◽  
Dynamic Behaviour ◽  
Stable Equilibrium ◽  
Qualitative Change ◽  
Theoretical Studies ◽  
Different Temperatures ◽  
Dependent Model ◽  
Two Temperatures ◽  
The Difference ◽  
Experimental And Theoretical Studies

In the present study, the population dynamics of M. domestica was evaluated at two different temperatures, 20 and 30ºC. The dynamics was modeled using a density-dependent model of population growth. The temperatures investigated in this study produced no qualitative change in terms of dynamic behaviour, i. e. the population dynamics of M. domestica was characterized by a stable equilibrium at both temperatures. However, the steady state was influenced by the results obtained at different temperatures. The difference between the eigenvalues obtained at the two temperatures was probably the cause of the difference between the distinct steady states. The implications of these results for the population dynamics of M. domestica are discussed.

scholarly journals AX2: Type of compounds and an overview of theoretically investigated TiO2

2020 ◽  
Vol 9 (2) ◽  
pp. 79-87
Author(s):  
Dušica Jovanović ◽  
Jelena Zagorac ◽  
Branko Matović ◽  
Aleksandra Zarubica
Keyword(s):  
Band Gap ◽  
Wide Band ◽  
Theoretical Studies ◽  
Chemical Bonds ◽  
Wide Band Gap ◽  
Specific Temperature ◽  
Temperature And Pressure ◽  
The Difference ◽  
The Stability ◽  
Experimental And Theoretical Studies

AX 2-type compounds can be ionic, covalent or molecular types of structure, which depends on the size of atoms and the polarization properties. The materials of such type of the structure have different properties that can find the application in various areas of science and industry. Titanium dioxide, as a material of AX 2-type of the structure is a wide band gap semiconductor that has been widely investigated due to its photocatalytic properties and applicability for various purposes, such as the production of solar cells, decontamination of pollutants, elimination of microorganisms, suppression of cancer cells, etc. Experimental and theoretical studies of this metal oxide can give different data on the stability of individual crystalline modifications and their transitions. This study has presented an overview of theoretically examined TiO 2 modifications and current problems that can be encountered (such as various band gap values obtained by different methods and functionals; the difference between the stability of modifications examined on ab initio level and experimentally; the character of chemical bonds and transitions at the specific temperature and pressure conditions…) and overrun by optimal corrections added in calculations.

scholarly journals XIX. On the thermo-electric series

1858 ◽  
Vol 148 ◽  
pp. 369-381 ◽  
Keyword(s):  
The Other ◽  
Electric Currents ◽  
Philosophical Magazine ◽  
Thermo Electric ◽  
Different Temperatures ◽  
Alkaline Earths ◽  
Two Temperatures ◽  
The Difference

Being enabled by the method described in the Philosophical Magazine (February 1857) to obtain wires of the metals of the alkalies and alkaline earths, I have determined their places, together with most of those of the other metals and some alloys, in the thermo-electric series. The alloys which were experimented with, are those described by Rollman as giving with other metals stronger thermo-electric currents than those of bismuth or antimony under the same circumstances. If A, B, C are different metals, and (A, B), (B, C), (C, A) the electromotive powers of thermo-elements formed out of each two of these metals, whose alternate soldering-points are at two different temperatures, then (A, B)+(B, C)+(C, A) = 0, and therefore (A, B) = a-b , (B, C) = b-c , (C, A) = c-a , where the values of a, b, c not only depend on the two temperatures, but also on the nature of each of the metals A, B, and C. As the "differences” of the same constitute the electromotive powers, the value for any one of these metals may be put = 0. If the temperatures of the soldering-points of a thermo-element only vary slightly, the electromotive power may be said to be proportional to the difference of the two temperatures, and under the same conditions the quantities a, b, c are also proportional to the difference of the temperatures, and their ratios to each other therefore independent of the same. If now the value of a second metal relative to the above-named value of the first be taken = 1, the values of the others in relation to these can be deduced, and only depend on the nature of each metal. These values I will call the Thermo-electric Numbers of the metals.

scholarly journals New insights into single-compound and binary adsorption of copper and lead ions on a treated sea mango shell: experimental and theoretical studies

2017 ◽  
Vol 19 (38) ◽  
pp. 25927-25937 ◽  
Author(s):  
Lotfi Sellaoui ◽  
Felycia Edi Soetaredjo ◽  
Suryadi Ismadji ◽  
Éder Cláudio Lima ◽  
Guilherme L. Dotto ◽  
...  
Keyword(s):  
Adsorption Isotherms ◽  
Binary Systems ◽  
Lead Ions ◽  
Theoretical Studies ◽  
Binary Adsorption ◽  
Mango Fruit ◽  
Different Temperatures ◽  
Single Compound ◽  
Experimental And Theoretical Studies

Herein, adsorption isotherms of Pb(ii) and Cu(ii) ions on treated sea mango fruit in both single-compound and binary systems were experimentally realized at different temperatures in the range of 30–50 °C.

Reaction Mechanisms of Anisole Pyrolysis at Different Temperatures: Experimental and Theoretical Studies

2021 ◽  
Author(s):  
Ting Zhang ◽  
Chiranjivi Bhattarai ◽  
Yeongkwon Son ◽  
Vera Samburova ◽  
Andrey Khlystov ◽  
...  
Keyword(s):  
Reaction Mechanisms ◽  
Theoretical Studies ◽  
Different Temperatures ◽  
Experimental And Theoretical Studies

The Stabilizing Effect of Pre-Equilibria: A Trifluoromethyl Complex as CF2 Reservoir in Catalytic Olefin Difluorocarbenation

2020 ◽  
Author(s):  
Thomas Louis-Goff ◽  
Huu Vinh Trinh ◽  
Eileen Chen ◽  
Arnold L. Rheingold ◽  
Christian Ehm ◽  
...  
Keyword(s):  
High Selectivity ◽  
Side Reactions ◽  
Theoretical Studies ◽  
Attractive Feature ◽  
Catalyst Recovery ◽  
Wide Range ◽  
Stabilizing Effect ◽  
Experimental And Theoretical Studies

A new, efficient, catalytic difluorocarbenation of olefins to give 1,1-difluorocyclopropanes is presented. The catalyst, an organobismuth complex, uses TMSCF<sub>3</sub> as a stoichiometric difluorocarbene source. We demonstrate both the viability and robustness of this reaction over a wide range of alkenes and alkynes, including electron-poor alkenes, to generate the corresponding 1,1-difluorocyclopropanes and 1,1-difluorocyclopropenes. Ease of catalyst recovery from the reaction mixture is another attractive feature of this method. In depth experimental and theoretical studies showed that the key difluorocarbene-generating step proceeds through a bismuth non-redox synchronous mechanism generating a highly reactive free CF<sub>2</sub> in an endergonic pre-equilibrium. It is the reversibility when generating the difluorocarbene that accounts for the high selectivity, while minimizing CF<sub>2</sub>-recombination side-reactions.

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