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Tytuł:
X-ray Analysis of Liquid 1-Methylnaphthalene Structure at 293 K
Autorzy:
Drozdowski, H.
Powiązania:
https://bibliotekanauki.pl/articles/2014543.pdf
Data publikacji:
2000-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
Opis:
The paper reports results of the X-ray diffraction structural studies of liquid 1-methylnaphthalene, C$\text{}_{10}$H$\text{}_{7}$-CH$\text{}_{3}$ at 293 K, using Mo K$\text{}_{α}$ radiation of the wavelength λ=0.71069 A. The interpretation of the results was carried out using the reduction method of Blum and Narten. Experimental distribution of X-ray scattered intensity was compared with theoretical results predicted for a proposed model of 1-methylnaphthalene molecule. The electron-density radial-distribution function was calculated and some intra- and intermolecular distances in liquid 1-methylnaphthalene were determined. The structural data obtainable by X-ray analysis for liquid 1-methylnaphthalene are discussed. X-ray structural analysis was applied to determine the packing coefficient of 1-methylnaphthalene molecules. The electron-density radial-distribution function 4πr$\text{}^{2}$ ∑$\text{}_{j,k}^{n}\overline{K}\text{}_{j}$[ρ$\text{}_{k}$(r) — ρ$\text{}_{0}$] was calculated and some intra- and intermolecular distances in liquid 1-methylnaphthalene were determined. The structural data obtainable by X-ray analysis for liquid 1-methylnaphthalene are discussed. X-ray structural analysis was applied to determine the packing coefficient of 1-methylnaphthalene molecules.
Źródło:
Acta Physica Polonica A; 2000, 98, 6; 691-703
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray Diffraction Studies of Liquid Methylcyclohexane $C_6H_{11}-CH_3$ Structure at 293 K
Autorzy:
Drozdowski, H.
Nowakowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1812249.pdf
Data publikacji:
2008-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
Opis:
The structure of methylcyclohexane $C_6H_{11}-CH_3$ at 293 K was investigated using the X-ray diffraction method. An angular distribution of X-ray radiation scattered in liquid methylcyclohexane was measured. The observable range of scattering angles was 6°≤2Θ≤120°. Monochromatic radiation Mo K_αenabled determination of the scattered intensity between $S_\text{min}=0.92 Å^{-1}$ and $S_\text{max}=15.313 Å^{-1}$. The differential radial distribution function of electron density was calculated. The mean structural parameters of liquid methylcyclohexane (inter- and intramolecular distances, radii of coordination spheres, and packing coefficient) were determined and discussed. The most probable binary radial correlation of molecules in liquid methylcyclohexane was proposed. The approach proposed in this paper gives a good description of intermolecular interactions in liquids and is a useful X-ray method for their analysis. The paper presents the structure and molecular correlations in liquid methylcyclohexane determined for the first time by the X-ray diffraction method. The study of methylcyclohexane is a continuation of our studies of cyclohexane derivatives cyclohexylamine and 2-methylcyclohexane. The aim of the study was to establish a relation between the cis and trans isomers and the conformation of the cyclohexane derivatives in the liquid phase.
Źródło:
Acta Physica Polonica A; 2008, 114, 2; 383-389
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local Structure and Molecular Correlations in Liquid Naphthalene
Autorzy:
Bochyński, Z.
Dejneka, L.
Powiązania:
https://bibliotekanauki.pl/articles/1968847.pdf
Data publikacji:
1998-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.em
Opis:
X-ray diffraction studies of liquid naphthalene and, for the sake of comparison, of liquid benzene and diphenyl were performed. The results permitted the determination of the intermolecular distances and the packing coefficient. A comparison of the structures of liquid naphthalene, benzene, and diphenyl shows that in benzene and diphenyl 3 coordination spheres of molecular ordering can be distinguished in the range up to 18 Å, while in naphthalene only two in the range up to 15 Å. Analysis of the space packing in (benzene, naphthalene, and diphenyl) all liquids studied has proved its substantial increase with increasing volume of their molecules.
Źródło:
Acta Physica Polonica A; 1998, 93, 3; 471-478
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Molecular Correlation of Liquid Alkanes
Autorzy:
Bochyński, Z.
Drozdowsκi, H.
Powiązania:
https://bibliotekanauki.pl/articles/1943934.pdf
Data publikacji:
1995-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
Opis:
The paper reports structural investigations of a series of liquid alkanes, from n-C$\text{}_{6}$H$\text{}_{14}$ (n-hexane) to n-C$\text{}_{16}$H$\text{}_{34}$ (n-hexadecane), differing by two methyl groups (CH$\text{}_{2}$)$\text{}_{2}$, n-C$\text{}_{20}$H$\text{}_{42}$ (n-eicosane) and n-C$\text{}_{30}$H$\text{}_{62}$ (n-triacontane) performed in temperatures from 20°C to 70°C. The average angular distribution of intensity was determined by diffraction of monochromatic X-ray radiation Mo K$\text{}_{α}$, λ = 0.7107 Å and the functions of radial distribution of electron density were calculated for the studied compounds. Mean structural parameters including distances between molecules and atoms, coordination numbers as well as correlation parameters were obtained. The suitability of the method for structural studies of n-alkanes with the number of carbon atoms from 6 to 30 is discussed.
Źródło:
Acta Physica Polonica A; 1995, 88, 6; 1089-1096
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray Analysis of Intermolecular Interactions in Liquid 2-chloronaphthalene at 353 K
Autorzy:
Drozdowski, H.
Powiązania:
https://bibliotekanauki.pl/articles/2036984.pdf
Data publikacji:
2003-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
Opis:
The aim of the study was to examine the structure of liquid 2-chloronaphthalene C$\text{}_{10}$H$\text{}_{7}$-Cl at 353 K by the X-ray diffraction method. Monochromatic radiation Mo K$\text{}_{α}$,λ= 0.71069Å was used to determine the scattered radiation intensity between S$\text{}_{min}$=4πsinθ$\text{}_{min}$/λ=0.430Å$\text{}^{-1}$ and S$\text{}_{max}$= 4π sinθ$\text{}_{max}$/λ=14.311Å$\text{}^{-1}$. The curves of reduced intensity were analysed by the reduction method of Blum and Narten. Experimental distribution of X-ray scattered intensity was compared with theoretical results predicted for a proposed model of 2-chloronaphthalene molecule. The differential radial distribution function 4π r$\text{}^{2}$Σ$\text{}_{j,k}^{n}$ K$\text{}_{j}$[ρ$\text{}_{k}$(r)-ρ$\text{}_{0}$] was calculated and some intra- and intermolecular distances in liquid 2-chloronaphthalene were determined. X-ray structural analysis was applied to determine the packing coefficient of 2-chloronaphthalene molecules at 353 K. The intermolecular distance Cl ··· Cl' was also determined as 7.90±0.15Å. A simple model of short-range arrangement of the molecules was proposed, which seems to be valid for other weakly polar monosubstituted naphthalene derivatives in the liquid phase.
Źródło:
Acta Physica Polonica A; 2003, 104, 5; 441-458
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular Correlations in Liquid mono- and Dlichloroalkanes
Autorzy:
Bochyński, Z.
Drozdowski, H.
Powiązania:
https://bibliotekanauki.pl/articles/1945392.pdf
Data publikacji:
1996-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
Opis:
This paper reports results of the X-ray diffraction structural studies of a series of liquid monochloroalkanes (chlorohexane, chlorooctane, chlorodecane, chlorododecane) and dichloroalkanes (1, 6-dichlorohexane, 1, 8-dichlorooctane, 1, 10-dichlorodecane, 1, 12-dichlorododecane) performed at 20 and 40°C. From the X-ray diffraction patterns, obtained using Mo K$\text{}_{α}$ radiation of the wavelength λ = 0.7107 Å, the mean angular distributions of intensities were determined. Then, the functions of radial distributions of electron density were numerically found using Fourier analysis. The mean structural parameters of the studied liquids (the inter- and intramolecular distances, the radii of coordination spheres, the coordination numbers) and the local arrangement of their molecules were established. The intermolecular arrangements in the studied liquid mono- and dichloroalkanes were found to be similar. Correlations were found between certain physical and chemical properties of the studied compounds and the spatial arrangement of their molecules.
Źródło:
Acta Physica Polonica A; 1996, 89, 4; 547-554
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in and Compressibility of Water-Organic Mixtures. The System Water-Acetamide
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Orzechowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1952751.pdf
Data publikacji:
1996-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The experimental results of positron annihilation experiments in aqueous solutions of acetamide were compared to those of ultrasonic velocity. The system under investigation behaves untypically when changing acetamide concentration. From the point of view of surface tension it interacts with water like normal alcohols, while the positron annihilation and ultrasonic results suggest hydrophilic hydration and lack of hydrophobic interactions.
Źródło:
Acta Physica Polonica A; 1996, 90, 6; 1169-1177
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in and Compressibility of Water-Organic Mixtures. The System Water-Formamide
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Orzechowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1930626.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The experimental results of positron annihilation experiments in aqueous solutions of formamide were compared to those of ultrasonic velocity. The systems under investigation behave untypically while changing formamide concentration. The results are explained in terms of hydrophilic hydration and lack of hydrophobic interactions.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 563-569
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of Carbon Tetrachloride + t-Butanol Mixtures from Positron Annihilation and Ultrasonic Velocity Measurements
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929087.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The densities of and sound velocities in t-butyl alcohol solutions in CCl$\text{}_{4}$ were determined in temperature range 25 to 45°C. From these data the adiabatic compressibility coefficients of the solutions were calculated, as well as excess densities and compressibilities. The positron annihilation spectrum for this system in room temperature was measured. The results plotted against alcohol concentration suggest that the structural processes occurring in this system are caused by dimerization of the solute molecules.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 313-320
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of Cyclohexane + t-Butanol Mixtures from Positron Annihilation and Ultrasonic Velocity Measurements
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929089.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The densities of and sound velocities in t-butyl alcohol solutions in cyclohexane were determined in the temperature range 25 to 45°C. From these data adiabatic compressibility coefficients of the solutions were calculated, as well as excess densities and compressibilities. The positron annihilation spectra of the solutions were measured at room temperature. The results plotted against alcohol concentration show structural processes, which can be attributed to dimerization of the solute molecules.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 321-326
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in and Compressibility of Water-Organic Solutions. The System Water-Pyridine
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Jeżowska-Trzebiatowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1920939.pdf
Data publikacji:
1992-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The results of positron lifetime and ultrasonic velocity measurements in dilute aqueous pyridine (PYR) solutions show unusual changes in ultrasonic, annihilation data in function of pyridine concentration. The results obtained suggest that strong structural changes occur in the system, in the region of low pyridine concentrations. Liquid clathrate hydrates forming in the system are supposed with unusual stoichiometry and untypical geometry. They are supposed to be very short-living and/or unstable.
Źródło:
Acta Physica Polonica A; 1992, 82, 3; 471-479
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in and Adiabatic Compressibility of Ethylene Glycol Aqueous Solutions
Autorzy:
Baranowski, A.
Jerie, K.
Gliński, J.
Orzechowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1933468.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The positron annihilation lifetime and ultrasonic velocity in aqueous ethylene glycol solutions were measured. A comparison between the concentration and temperature dependences of the above parameters suggests that there is a competition of hydrophobic (interstitial) and hydrophylic (substitutional) hydration.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 59-66
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of Aqueous Solutions of 1,2- and 1,3-Propanediol Investigated by Positron Annihilation and Ultrasonic Methods
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Orzechowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/2008041.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The structure of aqueous solutions of 1,2-propanediol and 1,3-propane-diol was investigated using adiabatic compressibility measurements and positron annihilation methods. The experimental results are different than those obtained earlier for systems where hydrophobic hydration dominates. There are some evidences for increased rigidity of the water network, which can arise from the formation of hydrogen bonds between diols and water.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 562-568
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrophobic-Like Solvation in Non-Aqueous Solutions: Positron Annihilation in and Compressibility of Tert-butanol and Tetramethylurea in Ethylene Glycol
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Przybylski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2024269.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The pioneer experimental results of positron annihilation experiments in non-aqueous solutions of tetramethylurea and tert-butanol were compared to those of ultrasonic velocity. For tert-butanol, the positron annihilation results exclude existence of hydrophobic-like interactions and formation of weak, labile crystalline-like solvates in solution. For tetramethylurea solute the changes of annihilation parameters with concentration are minor and only limited conclusions can be drawn on this system, while they are stronger for tert-butanol solute. However, all the above is consistent with an assumption that the more hydrophobic solute (tert-butanol) should affect the original glycol structure stronger than that interacting with glycol via hydrogen bondings only. On the other hand, the ultrasonic data for the systems tested, although very precise, hardly confirm formation of any specific structure. It is possible, however, that the solvates do not differ in their compressibility from the pure liquids, and/or are formed only in very small amounts. Thus, usefulness of the positron annihilation method in investigation of liquid structure was proven.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 385-392
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of Aqueous Solutions of 1,2-, 1,3- and 1,4-Butanediol Investigated by Positron Annihilation and Ultrasonic Methods
Autorzy:
Jerie, K.
Baranowski, A.
Gliński, J.
Orzechowski, K.
Przybylski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2024276.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Em
78.70.Bj
Opis:
The structure of aqueous solutions of 1,2-, 1,3- and 1,4-butanediol was investigated using adiabatic compressibility measurements and positron annihilation methods. In the case of 1,2-butanediol the experimental results are very similar to those obtained earlier for systems where hydrophobic hydration dominates. In other cases there are evidences for increased rigidity of the water network, which arises from formation of hydrogen bonds between diols and water. Usefulness of both the methods applied in investigating the structure of liquid solutions was proved.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 393-398
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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