Wyniki wyszukiwania - BazTech

1

Numerical approaches to the heat transfer problem in modern electronic structures

Raszkowski T., Samson A.

Computer Science

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2017

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Vol. 18 (1)

71--93

EN

The main aim of this paper is to present a detailed description of the research related to the modeling of heat conduction in modern electronic structures, including special consideration for numerical aspects of analyzed algorithms. The motivation to undertake the research as well as some of the most-important results of the experiments and simulations are also included. Moreover, a numerical approximation of the problem as well as the methodology used and a sample solution of the mentioned problem are presented. In the main part, the discretization techniques, Ordinary Differential Equation algorithms, and simulation results for Runge-Kutta’s and Gear’s algorithms are analyzed and discussed. Additionally, a new effective approach to the modeling of heat transfer in electronic nanostructures is demonstrated.

2

Analysis of influence of temperature on wellbore tubing dimensions

Kwietniewski M., Miedzińska D., Niezgoda T., Małek E.

Journal of KONES

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2016

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Vol. 23, No. 4

269--273

EN

The construction of exploitation wellbore is complex, it consists of several columns of pipelines which perform different tasks. It is very important to preclude flow of reservoir fluid between wellbore and ground. Tubing is a kind of a pipeline which is very important element of oil and gas wellbore construction. It allows to transport fracturing medium between wellbore station and underground deposit. Manufacture quality and correct mounting of tubing in the wellbore are the key for effective exploitation. However, during work those pipes are subjected to changeable loads which results in temperature value changes for example. That temperature variations can be caused by cold medium transport inside the pipe. In the paper, analyses of influence of temperature value changes on the tubing shrinkage were presented. Numerical analyses of section of pipe vertically located in the wellbore and loaded with changeable temperature were carried out. The calculations were made with the use of coupled structural and thermal analyses. Received results of tubing shrinkage for fragment of pipe were adapted to the column of pipes of 3000 m length. Results of numerical analyses were verified with the analytical calculations. Material of tubing was assumed as steel P110 which is often applied in the wellbore construction.

3

Electrical studies of phase stabilities in the Ce2O(CO3)2 źH2O/CeO2 and LaOHCO3/La2O3 systems

Bakiz B., Arab M., Guinneton F., Bourja L., Benlhachemi A., Gavarri J.-R.

Inżynieria Materiałowa

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2010

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Vol. 31, nr 3

787-790

EN

Using thermal analyses and electrical impedance spectroscopy measurements, we study the complex phase modifications observed in the case of two rare earth based systems during their thermal decomposition (decomposition of LaOHCO3 and Ce2O(CO3)2.H2O phases), and during their carbonatation under CO2 flow (carbonatation of oxides La2O3 and CeO2). The thermal decompositions are associated with significant electrical variations strongly connected with the thermogravimetry analyses. The CeO2 oxide is highly stable under CO2 flows and carbonatation does not occur as temperature increases. The electrical signals of carbonate formation from La2O3 might be mainly due to ionic conduction of CO3 2- ions in the carbonate phase stability domains.

PL

Stosując analizę termiczną oraz pomiary spektroskopii impedancyjnej badano kompleksowe modyfikacje faz obserwowane w przypadku dwóch układów opartych na pierwiastkach ziem rzadkich podczas ich termicznego rozkładu (rozkład faz LaOHCO3 i Ce2O(CO3)2.H2O) oraz podczas ich karbonizacji w przepływie CO2 (karbonizacja tlenków La2O3 i CeO2). Rozkładowi termicznemu towarzyszą znaczne zmiany elektryczne silnie związane z analizą termograficzną. Tlenek CeO2 jest wysoce stabilny przy przepływie CO2 i karbonizacja nie występuje ze wzrostem temperatury. Sygnały elektryczne tworzenia węglanu z La2O3 mogą być głownie spowodowane przewodnictwem jonowym CO3 2- w obszarach stabilności fazy węglanowej.

4

Synthesis and characterization of Zn(II), Cd(II) and Hg(II) complexes of isonicotinoyl hydrazone derived from orthohydroxybenzeneazoethylacetoacetate

Kashar T.I., El-Tabl A.S., El-Bahnasawy R.M.

Polish Journal of Chemistry

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1998

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Vol. 72, nr 9

2037-2044

EN

Mononuclear and binuclear Zn(II), Cd(II) and Hg(II) complexes of orthohydroxybenzeneazoethylacetoacetate isonicotinoyl hydrazone (H3L), have been synthesized and characterized by elemental analyses, IR, (1)H NMR and VIS-UV spectra, conductance and thermal analyses. The ligand behaves as tetradentate in mononuclear complexes and hexadentate in binuclear complexes. The molar conductance of the complexes has been discussed.

5

Rare earth(III) complexes with an amido acid derived from isonicotinic acid hydrazide: syntheses, characterization and antifungal activities

Shen X., Shi X.F., Liu Y.S., Yao T.M., Xie Y.Y.

Polish Journal of Chemistry

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1998

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Vol. 72, nr 6

1001-1008

EN

Rare earth(III) complexes, RE2(CPI)3xnH2O (RE=La,Ce,Pr,Sm, Gd, Tb, Dy, Er,Yb, Sc, n=3; RE=Nd, Eu, n=4;H2CPI=1-[(N-carboxymethyl-N-phenyl)amino]acetylisonicotinic acid hydrazide), have been synthesized and characterized by IR, UV and (1)H NMR spectroscopy, magnetic susceptibility, elemental analysis, molecular conductivity and TGA measurement. Preliminary pharmacological teste showed that these complexes exhibit definite inhibition activities against S.Sake Yake and C. Albicans (Robin) Berkh 50.

6

Decomposition of Mg(HSeO3)2x3H2O and Mg(HSeO3)2, IR spectroscopic and thermoanalytical investigations

Engelen B., Muller H., Unterderweide K.

Polish Journal of Chemistry

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1998

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Vol. 72, nr 2

263-268

EN

By crystallization from aqueous Mg(HSeO3)2 solutions, single cristals of Mg(HSeO3)2x3H2O, Mg(HSeO3)2, and MgSe2O5 could be obtained. The compounds have been characterized by means of IR spectroscopy. The dehydration mechanisms of Mg(HSeO3)2x3H2O and Mg(HSeO3)2 have been studied using TG, DTA and high-temperaure Raman techniques. DTA and TG measurements indicate that the thermal decomposition of Mg(HSeO3)2x3H2O results in the direct formation of the diselenite MgSe2O5. High-temperature Raman experiments under quasi static conditions (heating rate<5K/h, isothermal intervals of -1h) show that Mg(HSeO3)2x3H2O decomposes in two steps under the intermediate formation of the anhydrous hydrogenselenite Mg(HSeO3)2.