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Tytuł:
Analytical solutions of Schrödinger equation with new solvable potential family V(r)=A/r^2-B/r+Cr^(δ+1) via Nikiforov-Uvarov (NU) method
Autorzy:
Antia, Akaninyene Daniel
Akpan, Ita Okon
Ikot, Akpan Ndem
Maghsoodi, Elham
Zarrinkamar, Saber
Hassanabadi, Hassan
Powiązania:
https://bibliotekanauki.pl/articles/763317.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Schrödinger equation
Energy eigenvalue
Eigenfunction
Diatomic molecules
Hellmann-Feynmann theorem
Opis:
In this paper, we have presented the exact solutions of the Schrödinger equation with the family of potentials V(r)=A/r^2-B/r+Cr^(δ+1). We have obtained the energy eigenvalues and the corresponding wave functions expressed in terms of the associated Laguerre polynomials for  using the Nikiforov-Uvarov (NU) method. The energy levels for each case is computed for diatomic molecules H2, CO, NO and N2  for various values of and . We have also computed the expectation values of, and the Virial theorem using the Hellmann-Feynmann theorem (HFT).
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AAA – Physica; 2015, 70
0137-6861
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AAA – Physica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystal Structure Prediction and Charge Density Distribution of Highly Energetic Dimethylnitraminotetrazole: a First Step for the Design of High Energy Density Materials
Autorzy:
Arputharaj, D. S.
Srinivasan, P.
Asthana, S. N.
Pawar, R. B.
Kumaradhas, P.
Powiązania:
https://bibliotekanauki.pl/articles/358205.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
energetic materials
crystal structure prediction
charge density analysis
atoms in molecules
electrostatic potential
Opis:
The crystal structure of dimethylnitraminotetrazole has been predicted, based on systematically searching for densely packed structures within common organic crystal coordination types, followed by lattice energy minimization. The predicted crystal structures almost match the reported crystal structure determined by X-ray diffraction analysis. To understand the effect of the initial molecular geometry on the crystal packing, the crystal structure simulation was carried out for molecules taken from different environments, such as the X-ray structure (crystal field) and also from ab initiocalculations (gas phase). The predicted crystal structures from both environments are very similar to the reported X-ray structure with a maximum deviation of 4.5%. The crystal density predicted from both methods is close to that reported. The bond topological, energetic and electrostatic properties of the isolated molecule from the predicted crystal structure have been determined using Bader's theory of atoms in molecules. The bond topological characterization reveals that the C-N bond is the weakest bond in the molecule. A large electronegative potential is found in the vicinity of the NO2group and the nitrogen-rich region of the tetrazole ring; these are probably the reactive sites of this molecule.
Źródło:
Central European Journal of Energetic Materials; 2012, 9, 3; 201-217
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of neutrophil phagocytic, complement functions, and cytokines expression among diabetic patients in Abuja, Nigeria
Autorzy:
Babandina, Musa Muhammad
Mainasara, Abdullahi Suleiman
Bakare, Mustapha
Emeribe, Anthony Uchenna
Shuwa, Halima Ali
Haruna, Shamsuddeen
Muhammad, Aminu Said
Abdullahi, Idris Nasir
Powiązania:
https://bibliotekanauki.pl/articles/454973.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
diabetes mellitus
effector molecules
pro-inflammatory markers
Opis:
Introduction. Inflammatory response in Diabetes Mellitus (DM) begins with chronic sub-clinical inflammations as a result of insulin resistance and activation of both innate and adaptive immune system as the disease progresses to complicated diabetes. Hence, the present study investigated the neutrophil phagocytic, complement function (CH50), and some cytokine profiles among diabetic and non-diabetic patients attending the National Hospital in Abuja, Nigeria. Aim. To evaluate the neutrophil phagocytic, complement function (CH50), and some cytokine profiles among post-operative septic diabetic and post-operative septic non-diabetic patients at the National Hospital in Abuja, Nigeria. Material and methods. Subjects were recruited by convenient sampling technique through interviewer-administered questionnaires. Subsequently, blood samples were collected. Fasting blood sugar (FBS) (mmol/L) was determined using glucose oxidase method. Neutrophil function test (Fmol/phag) was assayed using nitroblue tetrazolium reduction test (NBT). Hemolytic complement function (CH 50) test was conducted using serum harvested from sheep sensitized with human group (ORh D +ve) red blood cells. While serum Interleukin-4, -6, -10 and TNF- α were determined using Enzyme Linked Immunosorbent Assay (ELISA). Results. Mean ± Standard deviation (SD) of FBS concentration of 10.5 ± 1.3 (mmol/|L) among diabetic and 4.7 ± 0.9 (mmol/L) among non-diabetics was recorded. There is a decrease in neutrophil phagocytic function with a mean ± SD of 5.4 ± 2.1 (Fmol/ phag) in diabetics compared to 9.2 ± 2.1 (Fmol/phag) in non-diabetics. Similarly, complement (CH 50) function and C-reactive protein were significantly lower in diabetics when compared to non-diabetics (p<0.001). There was a significant difference in IL-6 concentration between diabetics and non-diabetics groups, but no significant difference was observed in TNF-α, IL-4 and IL-10 concentrations between study groups (p>0.05). TNF-α and IL-6 was significantly higher in diabetics with cardiovascular disorders compared to non-diabetics subjects with cardiovascular disorders (p<0.001). Conclusion. Findings from this study revealed the association of complement, neutrophil phagocytic function, CRP and IL-6 among septic diabetic patients,. In addition TNF-α and IL-6 expression was higher in DM patients with cardiovascular disorders.
Źródło:
European Journal of Clinical and Experimental Medicine; 2019, 3; 229-235
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie topologicznej analizy gęstości elektronowej do opisu oddziaływań niekowalencyjnych
The use of topological analysis of electron density in characterization of noncovalent interactions
Autorzy:
Bankiewicz, B.
Rybarczyk-Pirek, A.
Małecka, M.
Domagała, M.
Palusiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/172723.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
Kwantowa teoria Atomów w Cząsteczkach
QTAIM
gęstość elektronowa
analiza topologiczna
wiązanie chemiczne
oddziaływanie niekowalencyjne
Quantum Theory of Atoms in Molecules
electron density
topological analysis
chemical bonding
noncovalent bonding
Opis:
All atomic and molecular properties are governed by an electron density distribution. Thus, the methods that deal with an analysis of the electron density distribution should have a particular appeal for chemists and help to understand the electron structure of molecules. The Quantum Theory of Atoms in Molecules gives the unique opportunity to have an insight into a region (e.g., an atom) of a given system (e.g. a molecule), delivering partitioning scheme which is defined explicitly within the rigorous quantum theory, from one side, and is applicable for experimentally available set of observables, from the other side. In that way QTAIM delivers a chemist a theoretical tool to study a small part of a molecule only, instead of dealing with the total energy of a whole system. In consequence, QTAIM has become one of the most powerful utilities of modern chemistry, forming a bridge between advanced theoretical and experimental techniques. In particular the properties of the electron density function in the so-called bond critical point (BCP, the (3, -1) saddle point on electron density curvature) seem to be valuable information for chemists, since it was proven in many papers that the chemical bonding can be characterized and classified on the basis of electron density characteristics measured in BCPs . In this review we firstly give a brief introduction to the theory, explaining most basic terms and dependences. In the main part of the review we discuss application of QTAIM in the qualitative and quantitative analysis of several various noncovalent interactions, focusing readers attention on such aspects as classification of interactions and interaction energy assessment. Both theoretical and experimental approaches are taken into account. We also discuss extensions of QTAIM to the analysis of the so called source function – the method which additionally enlarge interpretative possibilities of its parent theory. Finally, we give some examples which perhaps escape a rigorous QTAIM definition of chemical bonding. We acquaint the potential reader with arguments being pro- and against the QTAIM-based deterministic model of a chemical bond.
Źródło:
Wiadomości Chemiczne; 2014, 68, 5-6; 457-486
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected small molecules as inducers of pluripotency
Autorzy:
Baranek, Małgorzata
Markiewicz, Wojciech
Barciszewski, Jan
Powiązania:
https://bibliotekanauki.pl/articles/1038727.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
reprogramming
pluripotency
small molecules
iPSCs
Opis:
The general idea of regenerative medicine is to fix or replace tissues or organs with live and patient-specific implants. Pluripotent stem cells are capable of indefinite self-renewal and differentiation into all cell types of the body. An easily accessible source of induced pluripotent stem cells (iPSCs) may allow obtaining and culturing tissues in vitro. Many approaches in the methods leading to obtain iPSCs have been tested in order to limit immunogenicity and tumorigenesis, and to increase efficiency. One of the approaches causing pluripotency is usage of small molecule compounds. It would be of great importance to assess their specific properties and reveal their new capacity to induce pluripotent stem cells and to improve reprogramming efficiency. Identification of the epigenetic changes during cellular reprogramming will extend our understanding of stem cell biology and many therapeutic applications. In this paper we discuss mainly the nucleotide derivatives, already proven or for now only putative inducers of the cells' pluripotency, that modulate the epigenetic status of the cell.
Źródło:
Acta Biochimica Polonica; 2016, 63, 4; 709-716
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparatwe EPR analysis of oxygen interactions with plants carbonized at different temperatures
Autorzy:
Bartłomiejczyk, S.
Pilawa, B.
Krzesińska, M.
Pusz, S.
Zachariasz, J.
Wałach, W.
Powiązania:
https://bibliotekanauki.pl/articles/284848.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
karbonizacja roślin
centra paramagnetyczne
paramagnetyczne utlenianie cząsteczek
elektroniczny rezonans paramagnetyczny
widma EPR
oksymetria
carbonized plants
paramagnetic centers
paramagnetic oxygen molecules
electron paramagnetic resonance
EPR spectra
oximetry
Opis:
Carbon materials, bamboo (Bambusa vulagris) and yucca (Yucca flaccida) pyrolysed at 550°C, 750°C and 950°C, were tested as oximetric probes by electron paramagnetic resonance spectroscopy at X-band (9.3 GHz). The following parameters of the spectra: amplitude, linewidth and g-factor, were determined. Influence of oxygen molecules 02 on EPR spectra of the individual carbon materials was compared. Strong EPR spectra were recorded for samples carbonized at 550°C and weak signals were obtained for plants carbonized at higher temperatures: 750°C and 950°C. It was stated that amplitudes of EPR lines of all the carbonized plants decrease in the air environment compared to amplitudes of spectra measured in vacuum. This effect increases with degree of vacuum. Changes in the EPR spectra of samples studied in the air environment may be applied in medicine to determination of oxygen content in different cells. Because of strong resonance signals as oximetric probes we proposed bamboo and yucca carbonized at 550°C, and we rejected plants carbonized at 750°C and 950°C with Iow EPR signals.
Źródło:
Engineering of Biomaterials; 2008, 11, 73; 3-5
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural Semantic Metalanguage as Terminology
Autorzy:
Bułat Silva, Zuzanna
Powiązania:
https://bibliotekanauki.pl/articles/2015041.pdf
Data publikacji:
2021
Wydawca:
Komisja Nauk Filologicznych Polskiej Akademii Nauk, Oddział we Wrocławiu
Tematy:
natural semantic metalanguage (NSM)
semantic primes and molecules
reductive paraphrase
concrete and abstract nouns
terms
terminology
ontology
Opis:
In this paper I present the Natural Semantic Metalanguage approach (Goddard & Wierzbicka 2014; Goddard 2018; Wierzbicka 1996, 2013), arguing that it can be perceived as a terminological system, a terminology sui generis. NSM is a decompositional approach to semantics, based on the assumption that there are 65 basic concepts, known as semantic primes, and that all other concepts can be paraphrased in terms of elements taken from this set of 65. These elements are said to exist in all human languages – as words, phrases or morphemes – and they cannot be reduced any further. The system has been tested on more than 30 different languages so far and is considered one of the most comprehensive approaches to cross-linguistic semantics today. I want to shed light on the formal structure of NSM, and explain its most important theoretical concepts, such as semantic primes and molecules, reductive paraphrase and semantic template, in order to demonstrate its practical value across many domains. As an example of how NSM is used in practice, I will look at the meaning of one concrete and one abstract noun (beach and comfort, respectively).
Źródło:
Academic Journal of Modern Philology; 2021, 13; 61-73
2299-7164
2353-3218
Pojawia się w:
Academic Journal of Modern Philology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication Of Colloidal Clusters Decorated With Dye Molecules For Potential Application As Photonic Molecules
Wytwarzanie koloidalnych klasterów zdobionych cząsteczkami barwnika do potencjalnego zastosowania jako cząsteczki fotoniczne
Autorzy:
Cho, Y. S.
Powiązania:
https://bibliotekanauki.pl/articles/356171.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
colloidal clusters
fluorescent dyes
photonic molecules
particle self-assembly
klaster koloidalny
barwniki fluorescencyjne
cząsteczki fotoniczne
Opis:
In this study, colloidal clusters decorated with fluorescent dyes were fabricated by evaporation-driven self-assembly using emulsion droplets as confining geometries. Silica microspheres were synthesized by Stober method followed by the modification with dye molecules through additional surface sol-gel reaction for the formation of thin silica shell. The surface of the resultant dye-doped silica microspheres was modified with hydrophobic silane coupling agent to disperse the particle suspension in organic solvent such as hexane. The fluorescent silica microspheres were self-assembled inside oil-in-water emulsions by evaporation-driven self-assembly for the formation of colloidal clusters, potentially applicable for photonic molecules. The clusters with fluorescent emission were observed using confocal microscope.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1221-1225
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free electrons: fundamental interactions, applications and data needs
Autorzy:
Christophorou, L.
Powiązania:
https://bibliotekanauki.pl/articles/148509.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
applications
data
interactions
low-energy electrons
molecules
Opis:
In spite of the important recent advances in the field of low-energy electron interactions with atoms and molecules, there still exist fundamental needs and challenges, some of which are generic in their basic and applied significance. These include measurements of cross sections for a number of fundamental low-energy electron–ground-state molecule interaction processes such as vibrational excitation (direct and indirect) and dissociation into neutral fragments, studies of low-energy electron–excited molecule interactions, investigations of low-energy electron interactions with radicals and transient species, and measurements of electron energy losses in electron–molecule collision processes. They also include studies for linking of knowledge on isolated electron–molecule interactions to that in the condensed phases of matter, and the systematic and quantitative exploration of the interactions of low-energy electrons with molecular and macromolecular biological structures.
Źródło:
Nukleonika; 2003, 48, 2; 67-74
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Owrzodzenia podudzi i trudno gojące się rany
Venous ulcers and difficult-to-heal wounds
Autorzy:
Citko, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2138938.pdf
Data publikacji:
2022-06-01
Wydawca:
Wydawnictwo Naukowe Medyk sp. z o.o.
Tematy:
venous ulcers
difficult-to-heal wounds
TIME strategy
TIAB molecules
owrzodzenia podudzi
rany trudno gojące się
strategia TIME
molekuła TIAB
Opis:
In Poland, the most common types of difficult-to-heal wounds include: venous ulcers, pressure ulcers, ulcers associated with the diabetic foot syndrome, ischemic (arterial) ulcers and neoplastic wounds. In the local management of chronic wounds, the TIME strategy should be used (T – tissue and debridement – tissue preparation; I – infection and inflammation control – infection and inflammation control; M – moisture balance – wound moisture balance; E – edges – wound edges – no healing progress or undermining the edge of the wound and epidermization stimulation). The TIME strategy pays particular attention to reducing the risk of wound infection. The treatment of TIAB molecules [titanum argentum-benzoicum] in the treatment of chronic wound infection may be among the measures taken to reduce the risk of chronic wound infection. The introduction of nanotechnology and the combination of ionic silver nanoparticles with titanium dioxide by covalent bonds in the TIAB complex, revolutionized the effect of silver, many times increasing its antibacterial and antifungal properties, and removing its toxic effect by preventing accumulation in tissues. The precipitation of metallic silver from ionic compounds resulted in the loss of activity of the preparations and, with prolonged use, could lead to tissue damage. The patented form of TIAB silver on the titanium core has only an ionic / stable form of silver which is not reduced by exposure to light, as well as organic and inorganic compounds. TIAB silver is available in the form of a spray and cream, and has a proven effect on pressure ulcers and ulcers that heal difficult to heal. At the same time, it does not show any allergy to silver with prolonged use. The use of the TIAB molecule in the treatment of ulcers with symptoms of colonization was presented at the congress of the European Wound Treatment Society in 2012 in Vienna as a new and highly effective solution.
Źródło:
Lek w Polsce; 2022, 373, 06; 8-14
2353-8597
Pojawia się w:
Lek w Polsce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EMG field analysis in dynamic microscopic/nanoscopic models of matter
Analiza pola EMG w mikro/nanoskopowych modelach materii
Autorzy:
Fiala, Pavel
Bartušek, Karel
Dědková, Jarmila
Dohnal, Premysl
Powiązania:
https://bibliotekanauki.pl/articles/408104.pdf
Data publikacji:
2019
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
multiscaling
modeling
water
cluster
atom
molecules
structure
matter
low-level measurement
modelowanie
woda
klaster
cząsteczka
budowa
materia
pomiar niskiego poziomu
Opis:
We discuss a numerical model (macro/micro/nanoscopic) to enable more accurate analysis of electro-hydro-dynamic (EMHD) processes in water at the level of atoms. Dedicated experiments have shown that inserting a relatively homogeneous periodic structure (deionized, degassed, or distilled H2O) in a magnetic field will influence the atomic basis, molecules, and relevant bonds. In this context, the present paper focuses on the designing, analysis, and evaluation of the behavior of an extensive system that represents H2O from the microscopic perspective, and it also outlines the properties and changes of the bonds in the examined water samples. Complementarily, a simple example is used to define the results obtained from analyses of the generated spiral static gradient magnetic and non-stationary gradient electromagnetic fields from the frequency range of f = 1 GHz to 10 GHz.
W artykule przedyskutowano (makro/mikro/nanoskopowy) model numeryczny przeznaczony do dokładniejszej analizy procesów elektrohydrodynamicznych (EMHD) w wodzie na poziomie atomowym. Przeprowadzone w tym celu eksperymenty wykazały, że wprowadzenie względnie jednorodnej struktury okresowej (dejonizowanej, odgazowanej lub destylowanej wody w polu magnetycznym wpłynie na strukturę atomową, molekuły i odpowiednie wiązania. W tym kontekście niniejszy artykuł koncentruje się na projektowaniu, analizie i ocenie zachowania rozległego systemu, który reprezentuje H2O z perspektywy mikroskopowej, a także nakreśla właściwości i zmiany wiązań w badanych próbkach wody. Dodatkowo, zastosowano prosty przykład służy do definiowania uzyskanych wyników na podstawie analizy statycznych, spiralnych statycznych gradientowych i niestacjonarnych gradientowych pól elektromagnetycznych w zakresie częstotliwości od 1 GHz do 10 GHz.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2019, 9, 1; 4-10
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo fitting of data from muon catalyzed fusion experiments in solid hydrogen
Dopasowanie metodą Monte Carlo danych z eksperymentów katalizy mionowej w zestalonym wodorze
Autorzy:
Filipowicz, M.
Bystritsky, V.M.
Woźniak, J.
Powiązania:
https://bibliotekanauki.pl/articles/305341.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
dopasowywanie danych
symulacja Monte Carlo
estymator chi-kwadrat
obliczenia gradientu
symulacja dyfuzji
atomy i molekuły mionowe
data fitting
Monte Carlo simulation
chi-square estimator
gradient calculation
diffusion simulation
muonic atoms and molecules
Opis:
Applying the classical chi-square fitting procedure for multiparameter systems is in some cases extremely difficult due to the lack of an analytical expression for the theoretical functions describing the system. This paper presents an analysis procedure for experimental data using theoretical functions generated by Monte Carlo method, each corresponding to definite values of the minimization parameters. It was applied for the E742 experiment (TRIUMF, Vancouver, Canada) data analysis with the aim to analyze data from Muon Catalyzed Fusion experiments (extraction muonic atom scattering parameters and parameters of pd fusion in pdµ molecule).
Zastosowanie klasycznej procedury fitowania przy użyciu estymatora chi-kwadrat jest w pewnych przypadkach bardzo trudne z powodu braku analitycznych wyrażeń na teoretyczne funkcje opisujące system. W pracy zaprezentowano procedurę analizy danych eksperymentalnych przy użyciu teoretycznych funkcji generowanych metodą Monte Carlo, odpowiadających zdefiniowanym wartościom szukanych parametrów. Analiza została zastosowana dla eksperymentu E742 (TRIUMF, Vancouver, Kanada) w celu opisu danych pochodzących z syntezy jądrowej katalizowanej mionami (uzyskanie parametrów opisujących rozpraszanie atomów mionowych i parametrów syntezy pd w molekule pdµ).
Źródło:
Computer Science; 2008, 9; 11-20
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of the lengths of tree paths of gas molecules
Autorzy:
Golovkin, B. G.
Powiązania:
https://bibliotekanauki.pl/articles/1075713.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
distribution of molecules
gas
mean free path
pressure
radius of the molecule
temperature
Opis:
It is shown that the formula available in the literature for the distribution of the mean free paths of gas molecules, independent of pressure and temperature, produces obviously incorrect results. Accordingly, a conclusion is given for another formula for a given distribution, which depends on the size of the gas molecules, as well as temperature and pressure. In accordance with this formula, the distribution curve for oxygen at 1000 K and pressures 1 and 0.001 atm has been calculated.
Źródło:
World Scientific News; 2019, 119; 243-247
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical meaning temperature of gas and separate molecule
Autorzy:
Golovkin, B. G.
Powiązania:
https://bibliotekanauki.pl/articles/1157177.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
distribution of molecules by temperature
gas cell
mean free path
temperature of a molecule
Opis:
Starting from the equation of state of the Clapeyron gas, it is shown that the temperature of a monatomic molecule of radius and mass moving with velocity is equal to , where: l are the length of a molecule without collisions, the Boltzmann constant, the kinetic energy of the molecule. The physical meaning of the temperature of a molecule should be understood as the kinetic energy that it has in the path without collisions l. The dimension of temperature coincides with the size of energy, but quantitatively the energy differs by the presence of a dimensionless factor , characterizing the motion of a molecule in fractions of its radius. Based on the temperatures of the individual molecules and their relative amounts contained in the gas, a formula is proposed for the overall gas temperature, for any, even nonequilibrium, distribution. The physical meaning of the gas temperature is determined by the product of the mean kinetic energy, the average mean free path of its molecules, and their size.
Źródło:
World Scientific News; 2018, 94, 2; 313-320
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of gas molecules by their temperatures
Autorzy:
Golovkin, Boris Georgievich
Powiązania:
https://bibliotekanauki.pl/articles/1030475.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Clapeyron equation
Maxwell distribution
distribution of molecules by temperatures
gas density
gas pressure
Opis:
A formula is derived for the distribution of gas molecules over their temperatures depending on the total temperature of the gas. Formulas are proposed for the distribution of velocities and kinetic energies of gas molecules depending on the pressure and density of the gas. It is shown that these formulas are equivalent to the formulas of the corresponding Maxwell distributions, which depend only on temperature. A formula is derived for the distribution of the mean free paths of gas molecules depending only on the gas density. An example of calculating the distribution of gas molecules by their temperatures is given.
Źródło:
World Scientific News; 2020, 144; 89-102
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 48

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