Skocz do pozycji: 1.

Tytuł:

Vickers Hardness and Positron Annihilation Study of Eurofer97 and ODS Eurofer

Autorzy:

Bartošová, I.
Čížek, J.
Lukáč, F.
Slugeň, V.

Powiązania:

https://bibliotekanauki.pl/articles/1196045.pdf

Data publikacji:

2014-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

28.52.Fa

Opis:

This paper describes investigations of Eurofer97 and oxide dispersion strengthened version of this steel, in as received state and after annealing. Vickers hardness test was performed on the as received specimens and after annealing at various temperatures to obtain information about development of the strength of studied materials. After identifying the temperature region where significant changes of the strength take place we applied positron annihilation spectroscopy to probe the microstructural changes in ferritic/martensitic steels. An observation of phase transformation was observed in both steels at various temperatures indicating different behaviour of the base material and its strengthened version. All applied methods proved the importance of strengthening by oxides to improve properties of steels.

Źródło:

Acta Physica Polonica A; 2014, 125, 3; 702-705
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Cross Sections for l-Mixing of K(n$\text{}^{2}$F) States in Collisions with Ground-State K(4$\text{}^{2}$S) Atoms

Autorzy:

Głódź, M.
Huzandrov, A.
Klavins, J.
Sydoryk, I.
Szonert, J.
Gateva-Kostova, S.
Kowalski, K.

Powiązania:

https://bibliotekanauki.pl/articles/2014246.pdf

Data publikacji:

2000-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

34.50.Fa

Opis:

We report measurements of the cross sections σ$\text{}_{l-mix}$ for angular momentum mixing of the K(n$\text{}^{2}$F)(n=6, 7, 8) states with the K(n,l > 3) states, induced in thermal collisions with parent ground state K(4$\text{}^{2}$S) atoms. The experiment was performed in a cell heated to ca. 450K. The n$\text{}^{2}$F states were excited in two steps: 4$\text{}^{2}$S → 4$\text{}^{2}$P → n$\text{}^{2F}$ by using a diode laser for the first step (a dipole-transition) and a pulsed dye laser for the second step (a quadrupole-transition). The measured values σ$\text{}_{l-mix}$ (6$\text{}^{2}$F)=3.6+-2.2, σ$\text{}_{l-mix}$ (7$\text{}^{2}$F)=4.2+-2.6 and σ$\text{}_{l-mix}$ (8$\text{}^{2}$F)=8.0+-4.6 (in units of 10$\text{}^{-13}$cm$\text{}^{-1}$) are close to the corresponding values of the geometrical cross sections.

Źródło:

Acta Physica Polonica A; 2000, 98, 4; 353-361
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Gamma Ray Shielding Properties of Some Concrete Materials

Autorzy:

Fugaru, V.
Bercea, S.
Postolache, C.
Manea, S.
Moanta, A.
Petre, I.
Gheorghe, M.

Powiązania:

https://bibliotekanauki.pl/articles/1192350.pdf

Data publikacji:

2015-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

28.52.Fa

Opis:

Concrete of various type have been used extensively for the adequate shielding of the radiological equipment using X and gamma rays. In its basic form, concrete is composed of pieces of inert aggregate held together by hardened cement paste. Different concrete types with special cements have been prepared. The linear attenuation coefficients of conventional concrete and concrete with supplementary mineral additives (barite and witherite) at different gamma energies (Co-60: 1.25 MeV, Cs-137: 0.662 MeV, Ir-192: 0.37 MeV) in narrow beam conditions have been measured. This paper includes some experimental data regarding the influence of barite and witherite additives on photon attenuation coefficients of concrete.

Źródło:

Acta Physica Polonica A; 2015, 127, 4; 1427-1429
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Evolution of the International Metric System of Units SI

Autorzy:

Chyla, W.

Powiązania:

https://bibliotekanauki.pl/articles/1492767.pdf

Data publikacji:

2011-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

06.20.fa

Opis:

Once the New SI is approved by the General Conference on Weights and Measures (CGPM), all base units of the international metric system of units (SI) will be defined in terms of physical constants and atomic properties. In this paper, we consider the rationale and the direction of the possible further evolution of the SI. The idea is to define all base units exclusively in terms of fundamental physical constants, with no reference to specific phenomena, physical theories or properties of material entities (including properties of atoms and elementary particles), so that those definitions would not have to be altered or amended following advancement in our understanding of the structure of matter, emergence of new physical theories or due to the technological progress. New developments in science and technology would then affect only the mise en pratique (realization) of base units, rather than their definitions. Furthermore, we point out the need for including base units for the weak interaction and the strong interaction into the SI and propose a way to do it. The structure of the fundamental-constants-based system of units (the FC SI) is discussed and prerequisites for the implementation of the FC SI are considered.

Źródło:

Acta Physica Polonica A; 2011, 120, 6; 998-1011
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

GaAlAs Allox/Pseudoalloy Type II Structures

Autorzy:

Jeżewski, M.
Teissier, R.
Planel, R.

Powiązania:

https://bibliotekanauki.pl/articles/1879871.pdf

Data publikacji:

1991-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.65.Fa

Opis:

The existence of type-II structures made from the combination of Ga$\text{}_{1-x}$AI$\text{}_{x}$As alloy and a short period GaAs/AlAs type-I superlattice is presented. Such three material structures are of type-II having at the same time electrons and holes of Γ-symmetry. This contrasts with the usual situation in type-II two material GaAs/AlAs structure where the ground state of electrons is of X-symmetry. The mechanism allowing creation of three material type-II structures is based on the difference of effective masses of electrons and holes. It should be valid for all similar semiconductor systems. Experimental results of photoluminescence and photoluminescence excitation studies of such structures made by Molecular Beam Epitaxy are presented. We determine the mutual positions of the electron and hole ground levels in the alloy and pseudoalloy and confirm that the studied structure is of type-II.

Źródło:

Acta Physica Polonica A; 1991, 79, 2-3; 195-198
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Characteristics and biological properties of ferulic acid

Autorzy:

Dędek, Kamil
Rosicka-Kaczmarek, Justyna
Nebesny, Ewa
Kowalska, Gabriela

Powiązania:

https://bibliotekanauki.pl/articles/410448.pdf

Data publikacji:

2019

Wydawca:

Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej

Tematy:

ferulic acid
FA
health-promoting properties of FA
synthesis of FA in plants
metabolism of FA
kwas ferulowy
własciwości prozdrowotne kwasu ferulowego
synteza kwasu ferulowego u roślin
metabolizm kwasu ferulowego

Opis:

The interest in the properties of hydroxycinnamic acids with health-promoting properties is constantly increasing. That is why more and more research is being conducted to better understand these properties. Ferulic acid, FA (4-hydroxy-3-methoxycinnamic acid) is a derivative of hydroxycinnamic acid found in the plant tissue. It is possible to find him among others in bran cereal, popcorn bamboo shoots, and coffee. According to available literature data ferulic acid has a lot of biological properties, particularly appreciated in medicine. Its bioactive properties effectively contribute to the fight against diseases described as a civilization, including neurodegenerative diseases that increase the incidence. As reported the World Alzheimer Report, the number of people with dementia progression in 2016 exceeded 47.5 million, of which 33.5 million were diagnosed with Alzheimer's disease. According to the WHO estimates, this number will triple by 2050. The manuscript presents health-promoting properties of FA on the example of its antioxidant, antidiabetic, hepatoprotective, anti-atherosclerotic, neuroprotective, antineoplastic and antibacterial properties. In addition, the reaction of its synthesis in plants and in-vivo metabolization have been explained. The collected data suggest that bioactive FA molecules can effectively reduce the risk of civilization diseases and significantly reduce the level of oxidative stress contributing to the formation of neurodegenerative diseases.

Źródło:

Biotechnology and Food Science; 2019, 83, 1; 71-85
2084-0136
2299-6818

Pojawia się w:

Biotechnology and Food Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Radiation Shielding Properties of Mortars and Plasters Used in Historical Buildings

Autorzy:

Özavci, S.
Çetın, B.

Powiązania:

https://bibliotekanauki.pl/articles/1031750.pdf

Data publikacji:

2017-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

28.52.Fa
28.41.Qb

Opis:

In this study, the radiation absorption properties of mortars and plasters used in historical buildings have been investigated. Studied lime concretes contained such additives as brick dust, fertilizer, wet lime, wool, egg white, bone meal, rice, casein, whey, bone ash and tree leaf juice, in different concentrations. The linear attenuation coefficients of gamma rays in lime concretes have been measured at 662, 1773 and 1332 keV. The gamma rays have been obtained from ¹³⁷Cs and ⁶⁰Co sources and the measurements have been performed using a gamma spectrometer, based on a 3"× 3" NaI(Tl) detector, connected to 16384-channel multi-channel analyser.

Źródło:

Acta Physica Polonica A; 2017, 132, 3; 986-987
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Usability of Fuzzy Logic Modeling for Prediction of Fresh Properties of Self-Compacting Concrete

Autorzy:

Beycioğlu, A.
Gültekin, A.
Aruntaş, H.

Powiązania:

https://bibliotekanauki.pl/articles/1031137.pdf

Data publikacji:

2017-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

07.05.Mh
28.52.Fa

Opis:

The aim of this study is to investigate the usability of fuzzy logic modelling for prediction of fresh properties of self-compacting concrete. In the modelling process, the percentage of fly ash and the percentage of granulated blast furnace slag, as replacement of cement, the percentage of micronized calcite, as replacement of total aggregate, were used as inputs. The slump flow diameter and time and also the V-funnel time were used as outputs. Results show that fuzzy logic modelling may be a useful approach to predict fresh properties of self-compacting concrete, containing fly ash, granulated blast furnace slag and micronized calcite.

Źródło:

Acta Physica Polonica A; 2017, 132, 3; 1140-1141
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Determination of radiation attenuation coefficients in concretes containing different wastes

Autorzy:

Özavci, S.
Çetın, B.

Powiązania:

https://bibliotekanauki.pl/articles/1068130.pdf

Data publikacji:

2016-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

28.52.Fa
28.41.Qb

Opis:

Environmental wastes can be cleaned in a very long time by ecosystem. However, the cleaning power of the ecosystem is not enough. For this reason, the evaluation of the different areas of waste processing is important. In this study attenuation coefficient of gamma rays has been investigated for concretes containing different amounts of glass, bulb and plastic wastes.

Źródło:

Acta Physica Polonica A; 2016, 130, 1; 316-317
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Determination of the natural radioactivity level of Amasya Şeyhcui Region

Autorzy:

Coşkun, A.
Çetın, B.

Powiązania:

https://bibliotekanauki.pl/articles/1068311.pdf

Data publikacji:

2016-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

28.52.Fa
28.41.Qb

Opis:

People are exposed to both internal and external radiation from the natural radiation sources. For this reason, studies determining the natural radiation level are made to detect the effects of radionuclides, that constitute the natural radiation sources, on the environment and especially the effects of radiation on people and on biological systems. The most common radiation sources are ²³⁸U, ²²⁶Ra, ²³²Th and ⁴⁰K radioisotopes. In this study, in the samples of the rock and soil acquired from Amasya Şeyhcui Region, the activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K are determined by using NaI (Tl) detector with gamma spectrometer and are compared with the limit values.

Źródło:

Acta Physica Polonica A; 2016, 130, 1; 309-310
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Josephson Network as a Model for Inhomogeneous Superconductor: a Microwave Power Absorption

Autorzy:

Rycerz, A.
Spałek, J.

Powiązania:

https://bibliotekanauki.pl/articles/2047320.pdf

Data publikacji:

2007-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

74.81.Fa
74.25.Nf

Opis:

We discuss the applied magnetic field dependence of the microwave absorption by a three-dimensional array of up to 30×30 ×30 Josephson junctions with random parameters including the resistivity, capacity, and inductance of each junction. The numerical simulation results for the networks show characteristic microwave absorption anomalies observed in the ceramic samples of high temperature superconductor YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-x}$. We also provide a discussion of the absorption in simple analytical terms of the Josephson loop instabilities.

Źródło:

Acta Physica Polonica A; 2007, 111, 4; 581-594
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Physics of GaAs/AlAs Superlattices

Autorzy:

Planel, R.
Mollot, F.

Powiązania:

https://bibliotekanauki.pl/articles/1877495.pdf

Data publikacji:

1991-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.65.Fa
68.55.Bd

Opis:

We describe the main problems encountered in MBE growth of GaAs/AlAs superlattices and heterostructures. Then, basic features for the understanding of their electronic properties are given, in the envelope-function formalism, and some related optical experiments are reviewed.

Źródło:

Acta Physica Polonica A; 1991, 79, 1; 71-82
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Raman Scattering and Electrical Properties of TGS:PCo (9%) Crystal as Ambient Temperature IR Detector

Autorzy:

Malekfar, R.
Daraei, A.

Powiązania:

https://bibliotekanauki.pl/articles/1812050.pdf

Data publikacji:

2008-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.30.-j
77.84.Fa

Opis:

We developed and adequately characterized the triglycine sulfate family crystals doped with specific molar percent of cobalt phosphate, TGS:PCo (9%). The crystals were grown by slow evaporation technique and the growth rates of different crystallographic planes are rather faster in comparison with the plane growth rates of pure TGS crystals. The introduction of $Co^{2+}$ ion as an active optical element to the structure of TGS crystal leads to optimization of some parameters such as optical quality, stability at ambient condition, Curie temperature, stronger Raman peaks, etc. Three new peaks at 460, 620 and 1368 $cm^{-1}$ were observed in the dispersive back scattering Raman spectra of the grown TGS:PCo (9%) crystal in comparison with the pure triglycine sulfate crystal.

Źródło:

Acta Physica Polonica A; 2008, 114, 4; 859-867
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Raman Spectra and Structural Data of the Nanocrystalline KTP $(KTiOPO_4)$ Synthesized by Pechini Method

Autorzy:

Malekfar, R.
Cheraghi, A.
Ahmadi, G.
Khanzadeh, M.

Powiązania:

https://bibliotekanauki.pl/articles/1585099.pdf

Data publikacji:

2009-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.30.-j
77.84.Fa

Opis:

Nanocrystalline KTP powders are synthesized using a modified Pechini method. The structural and lattice modes of the products are investigated via X-ray diffraction, micro Raman backscattering spectroscopy, UV/vis/NIR and FT-IR transmission spectroscopy. The Debye-Scherrer formula is used to confirm the grain sizes estimated by the scanning electron microscopy slides.

Źródło:

Acta Physica Polonica A; 2009, 116, 6; 1073-1075
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Enhanced External Counterpulsation in Patients with Advanced Ischemic Cardiomyopathy

Autorzy:

Przywara-Chowaniec, B.
Gawlikowski, M.
Kuczaj, A.
Bachorz, M.
Czechowski, P.
Kowalski, P.
Geodecki, M.
Kawecki, D.
Barańska, K.
Paluch, M.
Pluszczyk, M.
Opara, M.
Puzio, A.
Nowalany-Kozielska, E.

Powiązania:

https://bibliotekanauki.pl/articles/1418031.pdf

Data publikacji:

2012-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

47.63.Ec
82.60.Fa

Opis:

A significant increase in the number of patients with heart failure of varied etiology has been observed in the recent years. Apart from pharmacological and surgical therapies, new, non-invasive assistance methods of cardiovascular system are still sought. One of them is external counterpulsation. Within this study, effectiveness of such a form of therapy has been examined in a group of 10 patients with an ischemic left ventricular systolic dysfunction. It has been shown that external counterpulsation has a beneficial influence onto the result of a six-minute walk test and causes a slight decrease in the creatinine concentration in the patients undergoing the tests.

Źródło:

Acta Physica Polonica A; 2012, 122, 5; 866-869
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Thermally Induced Intermixing of InGaAs/GaAs Single Quantum Wells

Autorzy:

Kozanecki, A.
Gillin, W.
Sealy, B.

Powiązania:

https://bibliotekanauki.pl/articles/1861378.pdf

Data publikacji:

1993-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.80.Mk
78.65.Fa

Opis:

In this work interdiffusion and strain relaxation in In$\text{}_{0.2}$Ga$\text{}_{0.8}$As/GaAs single quantum wells subjected to rapid thermal annealing have been studied using photoluminescence and Rutherford backscattering of 1.5 MeV He$\text{}^{+}$ ions. It has been found that the diffusion coefficient of In atoms in GaAs, evaluated from the photoluminescence spectra for the assumed Gaussian well shapes, agrees within 30% with that obtained using Rutherford backscattering. Channeling angular scans, through the ⟨110⟩ axial direction of the heterostructures indicate that strain relaxation in the intermixed wells is exclusively due to compositional shallowing of the wells.

Źródło:

Acta Physica Polonica A; 1993, 84, 4; 621-624
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Pulsed Laser Evaporation and Epitaxy

Autorzy:

Dubowski, J.J.

Powiązania:

https://bibliotekanauki.pl/articles/1888083.pdf

Data publikacji:

1991-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.55.-a
78.65.Fa

Opis:

The application of pulsed lasers for vaporization (ablation) of solid targets appears to be the most natural way to produce high purity fluxes of atoms/ions suitable for epitaxial growth of thin films. Since the early 1960's this unique approach has been the subject of steadily growing interest in the deposition of metals, dielectrics, semiconductors and since 1987, high-T$\text{}_{c}$ superconductors. Laser induced target surface morphology changes, properties of laser induced vapours and pulsed deposition rate associated with the use of a pulsed laser for vacuum epitaxy are discussed. A pulsed laser evaporation and epitaxy (PLEE) system is described and the results of PLEE application for the growth of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te and CdTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te quantum well and superlattice structures are reviewed. Feasibility of PLEE in bandgap engineering is also discussed.

Źródło:

Acta Physica Polonica A; 1991, 80, 2; 221-244
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Far-Infrared Magneto-Optical Studies of HgTe-CdTe Superlattices in the Semimetallic Regime

Autorzy:

Wojtowicz, T.
Dobrowolska, M.
Furdyna, J.K.
Meyer, J. R.
Bartoli, F. J.
Hoffman, C. A.
Ram-Mohan, L. R.

Powiązania:

https://bibliotekanauki.pl/articles/1888086.pdf

Data publikacji:

1991-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.65.Fa
78.30.Fs

Opis:

We review recent magneto-optical investigations performed on HgTe-CdTe semimetallic superlattices. Far infrared magnetotransmission data obtained as a function of temperature, photon energy, and sense of circular polarization are compared with the predictions of a comprehensive new theory which fully incorporates the complexities of type-III superlattice band structure. It is found that the theory accounts for nearly all of the many unusual features which have been observed experimentally. These include the occurrence of two cyclotron resonances due to holes; the coexistence of electron and hole cyclotron resonances in the low temperature limit; the observation of three distinct CRA minima; a step-like change in the temperature dependence of the electron cyclotron mass; and a dramatic increase of the CRI absorption peak intensity with increasing magnetic field.

Źródło:

Acta Physica Polonica A; 1991, 80, 2; 245-254
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Laser Induced Fluorescence of Indium Vapour

Autorzy:

Weyh, T.
Kopystyńska, A.
Kowalczyk, P.
Radzewicz, C.

Powiązania:

https://bibliotekanauki.pl/articles/1891958.pdf

Data publikacji:

1991-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

33.20.Kf
34.50.Fa

Opis:

Indium vapour was illuminated with laser light in the wavelength range 350-372 nm and at 410.3 nm. A few fluorescence bands of In$\text{}_{2}$ as well as a strong background emission of indium-quartz compounds were observed. An evidence of energy transfer processes in indium vapour was found.

Źródło:

Acta Physica Polonica A; 1991, 80, 6; 801-804
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Molecular Beam Epitaxy of II-VI Based Heterostructures

Autorzy:

Kolodziejski, Leslie A.
Gunshor, Robert L.
Nurmikko, Arto V.
Otsuka, Nobuo

Powiązania:

https://bibliotekanauki.pl/articles/1877456.pdf

Data publikacji:

1991-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.55.Bd
78.65.Fa

Opis:

The nonequilibrium growth technique of molecular beam epitaxy (MBE) has provided for the fabrication and investigation of a multitude of novel layered heterostructures based on II-VI compound semiconductors. The ability to grow epitaxial metastable magnetic and semimagnetic semiconductors layered with conventional II-VI semiconductors has resulted in structures which, for example, exhibit frustrated antiferromagnetism, and a wide wavelength tunability due to selftrapping of excitons in ZnTe-containing layered structures and due to extremely large (≈ 1 eV) quantum shifts of light emission from MnTe/CdTe superlattice structures. In addition, the control in the stoichiometry of surfaces and the composition of molecular beams used in the MBE growth technique has allowed for the fabrication of very advanced heterostructures which have combined the II-VI and III-V families of compound semiconductors. The work which will be described in the following review represents a very small sampling of the many important results achieved in the field of II-VI based heterostructures. The topics have been selected to illustrate and provide an example of the utility of MBE and the potential of "engineered" II-VI heterostructures and quantum wells.

Źródło:

Acta Physica Polonica A; 1991, 79, 1; 31-47
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

TEACHING ADULTS TO READ: INTRODUCING THE TONIC SOL-FA METHOD
Nauczanie czytania dorosłych: wprowadzenie do metody sol-fa tonic

Autorzy:

Majaro-Majesty, Henry

Powiązania:

https://bibliotekanauki.pl/articles/464268.pdf

Data publikacji:

2017

Wydawca:

Akademickie Towarzystwo Andragogiczne

Tematy:

sol-fa method
adults
literacy skills
learning
reading
metoda sol-fa tonic
dorośli
umiejętności czytania i pisania
nauka
czytanie

Opis:

The nature of adults and their peculiar learning difficulties make helping adults to learn to read a delicate task. Developing a method for helping adults to read, becomes also necessary. This report, introduces a method for helping adults learn through musical 8 tonic sol-fa sound tones. Indicative of high potential for leading adults to learn reading faster, the teaching method was mindful of learners’ low esteems and experiential connections to adult’s daily living. A step by step module and action–response-outcome (input output) analysis was carried out with successful outcome. This method was tried on 11 adults who not only demonstrated reading skills within few weeks, shown great enthusiasm in learning more literacy skills. The innovation applied adult teaching principles and the phonics words analysis approach. Although first tested on adults the method has high potential to help children learn reading skills even faster.
Natura ludzi dorosłych i ich szczególne trudności w nauce powodują, że pomoc dorosłym w nauce czytania jest delikatnym zadaniem. Dlatego koniecznością staje się praca nad metodą ułatwiającą dorosłym to zadanie. Niniejszy artykuł prezentuje metodę umożliwiającą uczenie się dorosłych czytania poprzez ośmiotonową metodę dźwięków. Metoda ta ma duży potencjał w przyśpieszeniu procesu uczenia się czytania wśród dorosłych i bierze pod uwagę fakt, iż czytanie nie jest powiązane z codziennym życiem uczących się oraz że dodatkową przeszkodą w nauce może być ich niskie poczucie własnej wartości. Analiza prowadzona na poszczególnych etapach wykazała jej skuteczność. Metoda została zastosowana wobec jedenastu osób, które w ciągu kilku tygodni osiągnęły umiejętność czytania oraz wykazały duże zainteresowanie dalszą nauką. Mimo że metoda była testowana na dorosłych, wykazuje duży potencjał w nauczaniu czytania dzieci.

Źródło:

Edukacja Dorosłych; 2017, 2; 241-253
1230-929X

Pojawia się w:

Edukacja Dorosłych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Theoretical study of atomic excitation by impact of protons in the variational formalism

Autorzy:

El Houda Benmansour, N.
Bouamoud, M.
Sahlaoui, M.

Powiązania:

https://bibliotekanauki.pl/articles/1068150.pdf

Data publikacji:

2016-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

34.80.Dp
34.50.Fa
95.30.Dr

Opis:

Schwinger's variational principle is used to evaluate excitation cross-sections of hydrogen atom by proton impact in a range of energies excluding a pertubative treatment. To describe the strong coupling between the excitation and the capture channels that exists at low energies, the continuum states have been introduced in the total wave function. Our results show that these states can describe properly the projectile capture states.

Źródło:

Acta Physica Polonica A; 2016, 130, 1; 145-146
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Josephson Junctions Like Behavior in Superconducting Nb Films with Diluted Triangular Arrays of Antidots

Autorzy:

Mumtaz, M.
He, S.
Qiu, X.
Kamran, M.

Powiązania:

https://bibliotekanauki.pl/articles/1192515.pdf

Data publikacji:

2015-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

74.25.F-
74.78.-w
74.81.Fa

Opis:

We present current versus voltage (I-V) measurement on superconducting Nb films with diluted triangular arrays (honeycomb and kagome) of antidots. Peaks and dips appearing in the derivative (dV/dI) of I-V curves showing the variation in the resistance is the indication of Josephson Junctions like weak-links in these systems. These observations also reveal the presence of mobile interstitial vortices in these lattices with regular pinning arrays. This behavior is predominant in honeycomb arrays due to large density of interstitial spaces in this system as compared that of to kagome lattice. This behavior can be tuned by temperature as well as external magnetic field but the tuning values of these parameters can be different for different symmetries of antidots.

Źródło:

Acta Physica Polonica A; 2015, 127, 4; 898-900
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Shaking during ion-atom collisions

Autorzy:

Sharma, P.
Nandi, T.

Powiązania:

https://bibliotekanauki.pl/articles/1158707.pdf

Data publikacji:

2016-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

31.15.xp
34.50.Fa
25.70.Bc

Opis:

The shaking (shakeup and shakeoff) processes accompanying ion-atom collisions are studied using non-relativistic hydrogenic wave functions for the K-, L- and M-shell electrons in the sudden approximation limit. The role of recoil amplitude in the shaking processes is discussed. It is found that the suddenness of collision between projectile and target nuclei plays a more definitive factor in the shaking of the respective atomic system than the recoil of nuclei.

Źródło:

Acta Physica Polonica A; 2016, 130, 3; 697-700
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Performance Analysis of a Dual Cycle Engine with Considerations of Pressure Ratio and Cut-Off Ratio

Autorzy:

Ebrahimi, R.

Powiązania:

https://bibliotekanauki.pl/articles/1535596.pdf

Data publikacji:

2010-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.70.Ln
82.60.Fa
88.05.-b

Opis:

The dual cycle is a better approximation to the modern high speed compression ignition engine than either the Diesel cycle or the Otto cycle. Therefore, this study is aimed at investigating the effects of pressure and cut-off ratios on the dual cycle performance with considerations of heat transfer loss, variable specific heat ratio and friction irreversible losses. By using finite-time thermodynamics theory, the relations between the power output and the compression ratio, between the thermal efficiency and the compression ratio, as well as the optimal relation between power output and the efficiency of the cycle are obtained. The results show that if compression ratio is smaller than certain value, the increase of pressure ratio and the decrease of cut-off ratio make the power output bigger. While if compression ratio exceeds certain value, the power output first increases and then starts to decline as pressure ratio and cut-off ratio are increased. With further increase in compression ratio, the power output decreases with increasing pressure ratio and decreasing cut-off ratio. The effects of pressure and cut-off ratios on the variation of the thermal efficiency with compression ratio are similar to those for the power output. The results obtained in this work can provide significant guidance for the performance evaluation and improvement of modern high speed compression ignition engines.

Źródło:

Acta Physica Polonica A; 2010, 118, 4; 534-539
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Effects of Variable Specific Heat Ratio on Performance οf an Endoreversible Otto Cycle

Autorzy:

Ebrahimi, R.

Powiązania:

https://bibliotekanauki.pl/articles/1537648.pdf

Data publikacji:

2010-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.70.Ln
82.60.Fa
88.05.-b

Opis:

Using finite-time thermodynamics, the relations between the work output and the compression ratio, between the thermal efficiency and the compression ratio for an endoreversible Otto cycle are derived with variable specific heat ratio of working fluid. The results show that if compression ratio is less than certain value, the increase of specific heat ratio makes the work output and the thermal efficiency higher; on the contrary, if compression ratio exceeds certain value, the increase of specific heat ratio makes the work output and the thermal efficiency less. The results also show that the maximum work output, the compression ratio at the maximum work output point, the working range of the cycle and the compression ratio at maximum thermal efficiency point decrease as the specific heat ratio increased. The results obtained from this work can be helpful in the thermodynamic modeling and in the evaluation of real Otto engines.

Źródło:

Acta Physica Polonica A; 2010, 117, 6; 887-891
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Baric Shift of Phase Transition in Ammonium Sulfate Crystals

Autorzy:

Gaba, V.

Powiązania:

https://bibliotekanauki.pl/articles/1550311.pdf

Data publikacji:

2010-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

77.84.Fa
78.20.Ci
77.80.Bh

Opis:

The influence of uniaxial mechanical pressures ($σ_m$ ≤ 200 bar) on the spectral (300-800 nm) and temperature (77-300 K) dependences of the refractive indices $n_{i}$, the birefringence $Δn_{i}$ and the phase transition point in ammonium sulfate crystals are studied. It is established that the uniaxial pressure does not change character of the dispersion $dn_{i}$/dλ, but only its value λ The shift of the phase transition in ammonium sulfate under the uniaxial mechanical pressure is analyzed.

Źródło:

Acta Physica Polonica A; 2010, 117, 1; 126-128
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Temperature-and-Spectral Deformations of the Optical Indicatrix of Rubidium Sulphate Single Crystal

Autorzy:

Gaba, V.

Powiązania:

https://bibliotekanauki.pl/articles/1550356.pdf

Data publikacji:

2010-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

77.84.Fa
78.20.Ci
77.80.Bh

Opis:

The paper deals with newly investigated temperature-and-spectrum dependences of principal birefringences (Δ $n_{i}$(λ,T)-i=X, Y, Z; λ=250÷850 nm; T = 4.2-1100 K), and temperature dependence of the optic-axial angle (2V(T) - T=4.2-1100 K) for two laser lines 632.8 nm and 441.1 nm of $Rb_{2}SO_{4}$ crystals. Based on the temperature dependence of the optic-axial angle, the second point of birefringence sign inversion has been found. Newly obtained is the temperature-and-spectrum diagram of the uniaxial state of the optical indicatrix at the "isotropic points" and in the hexagonal phase of $Rb_{2}SO_{4}$. Based on the temperature behavior of the birefringence and optic-axial angle it was supposed that hexagonal-orthorhombic phase transition in rubidium sulfate can be a second-order phase transition. Found is the inversion of birefringence dispersion in the X and Y directions at 400 K and 620 K, respectively.

Źródło:

Acta Physica Polonica A; 2010, 117, 1; 129-132
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Physical Model of the Pulmonary Circulation Designed for Investigation on Cardiac Output Measurement by Means of the Thermodilution Method

Autorzy:

Gawlikowski, M.
Pustelny, T.

Powiązania:

https://bibliotekanauki.pl/articles/1493354.pdf

Data publikacji:

2011-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

87.19.Hh
47.63.Ec
82.60.Fa

Opis:

The "gold clinical standard" of cardiac output measurements is the thermodilution method, implemented by the Swan-Ganz catheter. The unreliability of obtained results is difficult to estimate experimentally, due to the lack of reference methods or the risk of serious interferences in the measured object. Moreover, the pulsating blood flow produced by the heart is difficult to measure. Therefore it is advisable to develop the physical model of the pulmonary circulation, designed to investigate the accuracy of cardiac output measurements by means of the thermodilution method.

Źródło:

Acta Physica Polonica A; 2011, 120, 4; 798-802
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Effects of Equivalence Ratio and Mean Piston Speed on Performance of an Irreversible Dual Cycle

Autorzy:

Ebrahimi, R.

Powiązania:

https://bibliotekanauki.pl/articles/1493377.pdf

Data publikacji:

2011-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.70.Ln
82.60.Fa
88.05.-b

Opis:

In the present study, the performance of an air standard dual cycle is analyzed using finite-time thermodynamics. The relations between the power output and the compression ratio, between the power output and the thermal efficiency are derived by detailed numerical examples. The results show that the maximum power output and the power output at the maximum efficiency point increase and then decrease as the equivalence ratio and/or the mean piston speed increases. The results also show that the optimal compression ratio corresponding to maximum power output point and the working range of the cycle remain constant as the mean engine speed is increased, but they increase and then decrease as the equivalence ratio is increased. It is noteworthy that the results obtained in the present study are of significance for providing guidance with respect to the performance evaluation of practical internal combustion engines.

Źródło:

Acta Physica Polonica A; 2011, 120, 3; 384-389
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Instytucje nieformalne w teorii F.A. Hayeka
Informal institutions in F.A. Hayek’s theory

Autorzy:

Gruszewska, Ewa

Powiązania:

https://bibliotekanauki.pl/articles/434677.pdf

Data publikacji:

2013

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

F.A. Hayek’s theory
informal institutions
spontaneous order

Opis:

The concept of individualism, freedom, or economic order in F.A. Hayek’s theory, contains references to rules shaping people’s behavior. The author believes that every person has the right to follow his own rules. The rules are created in a spontaneous way and are not planned by anyone. Those institutions that, in terms of F.A. Hayek determine the existence and duration of societies, became the subject of considerations undertaken in this publication. The purpose of this article is to identify the informal institutions in theories announced by the Nobel Laureate. According to F.A. Hayek, there are socially valuable features that take the form of patterns and traditions shaping human behavior. Regularity appearing in actions of individuals, which is not always a direct result of a conscious action, often allows to make predictions of their behavior. The rules often forbid people to do what their instincts demand from them, they require a gradual change in people’s natural or instinctive reactions to other members of the community. This must be seen as a renunciation to the community. Individuals must submit to the operation of these social rules that are difficult to understand without special analysis. The ability to adapt determines the possibility of a society development. There is no individual able to possess the knowledge of all potentially possible situations to create an adequate system of behavior procedures. This is only possible with the help of other members of the society. As a result of “applying” their use, a type of a spontaneous order is formed. This forms the basis for developing adopted institutions. The kind of a sanction that upholds the rules, can be identified – it is the responsibility that goes beyond rules enforced by law. The purpose of the legal system is to maintain order formed spontaneously thus enabling to gain objectives by individuals. Hayek saw that in the long term, the new social rules are becoming more and more general, cease to be applicable to specific situations, but become abstract and more flexible. Spontaneous rule creation and change processes, their adaptation to changing realities cannot be replaced by an organized, purposeful order. This is due to the inability to obtain sufficient information about a variety of human behaviors and hence inability to create rules that would apply to such behavior. Creating the institutional order is a continuous process of trials and errors, a continuous experimentation of society with the rules. Hayek pointed out the barriers in shaping the institutional order and thus the social development. Their source can be non-compliance of adopted formal and informal evolutionary rules. Such a barrier affects the worse cooperation between the society members, reduces the benefits from economic activity, increases the business risk, makes the acquisition and processing of relevant information more difficult, and leads to informative chaos. Only cementing the adopted rules within rooted informal rules would allow their harmonized and effective impact on society.

Źródło:

Ekonomia - Uniwersytet Ekonomiczny we Wroclawiu; 2013, 4 (25); 166-178
2080-5977

Pojawia się w:

Ekonomia - Uniwersytet Ekonomiczny we Wroclawiu

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

High Heat Flux Testing of Doped and Coated Graphite Using High-Intensity Pulsed Ion Beam

Autorzy:

Zhu, X.
Liu, C.
Lei, M.

Powiązania:

https://bibliotekanauki.pl/articles/1807981.pdf

Data publikacji:

2009-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

28.52.Fa
52.59.Mv
81.05.Uw

Opis:

A high-intensity pulsed ion beam (HIPIB) technique is applied to heat flux testing of plasma facing materials for fusion experiment. The HIPIB is generated at a relatively stable power density up to $10^{8}$ W/$cm^{2}$, which covers a heat flux parameter of up to several hundreds MW $m^{-2} s^{1//2}$. Surface morphology and weight loss are examined for doped and coated graphite with HIPIB exposure of 280 MW $m^{-2} s^{1//2}$, being of the same order of thermal loads during off-normal events in future fusion reactors. The work demonstrates a first example utilizing the HIPIB technique to study thermal response of plasma facing materials under fusion relevant thermal loads.

Źródło:

Acta Physica Polonica A; 2009, 115, 6; 1177-1179
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Dynamics of Hydrogen Bonds in TGS Crystals Observed by Means of Measurements of Pyroelectric Currents Induced by Linear Changes of Temperature

Autorzy:

Trybus, M.
Paszkiewicz, T.
Woś, B.

Powiązania:

https://bibliotekanauki.pl/articles/1032468.pdf

Data publikacji:

2017-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

77.70.+a
77.84.Fa
77.80.B-

Opis:

The study of pyroelectric response of monocrystalline TGS cubic specimens to changes of temperature induced by linear and pulse heating of three mutually perpendicular pairs of cube sides demonstrated a complicated structure of signals. We attribute their forms to the activation of various hydrogen bonds between glycine G1, G2, and G3 molecules. In the case of pulse heating the pyroelectric signal is observed also in the paraelectric phase.

Źródło:

Acta Physica Polonica A; 2017, 132, 1; 161-163
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Critical Currents, Magnetization and Microwave Absorption of $(Tl_{0.5}Pb_{0.5})Sr_2(Ca_{0.8}Gd_{0.2})Cu_2O_{z}$ Superconductor

Autorzy:

Woch, W.
Niewolski, J.
Tokarz, W.
Kołodziejczyk, A.
Sudra, H.
Gritzner, G.

Powiązania:

https://bibliotekanauki.pl/articles/1536936.pdf

Data publikacji:

2010-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

74.81.Bd
74.25.Sv
74.81.Fa

Opis:

The bulk ($Tl_{0.5}Pb_{0.5})Sr_2(Ca_{1 - x}Gd_{x})Cu_2O_{z}$ superconductors with x = 0.1, 0.2 and 0.3 have unique and very interesting magnetic and electrical properties. In this paper we focused our attention on the superconductor with gadolinium content x = 0.2. We measured the magnetic field dependences of the transport critical currents, the microwave absorption as well as the magnetization for different temperatures. The critical temperature of this sample is $T_c$ = 105.3 ± 0.2 K and the transition width Δ $T_{90% - 10%}$ = 3.6 ± 0.2 K. The critical current of this superconductor is $J_c$ = 1 820 ± 10 A/$cm^2$ at 77 K. The data were analyzed within the frame of the Bean and Kim models as well as the percolation model.

Źródło:

Acta Physica Polonica A; 2010, 118, 2; 319-322
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Birefringence of Mechanically Stressed Potassium Tetrachlorine Zincanate Crystals

Autorzy:

Stadnyk, V.
Gaba, V.
Kohut, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1550377.pdf

Data publikacji:

2010-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

77.84.Fa
78.20.Ci
77.80.Bh

Opis:

The spectral and baric dependences of the birefringence $Δn_{i}$ of $K_{2}ZnCl_{4}$ crystals were studied. It is shown that the dispersion $Δn_{i}(λ)$ is normal and sharply increases on approaching the absorption edge. It is established that the uniaxial pressures do not change the character but only the values of the dispersions $dΔn_{i}$/dλ and temperature dependences of $dΔn_{i}$/dT.

Źródło:

Acta Physica Polonica A; 2010, 117, 1; 133-135
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Influence of Uniaxial Pressure on the Refractive Properties of Rubidium Tetrachlorine Zincanate Crystals

Autorzy:

Stadnyk, V.
Gaba, V.
Kohut, Z.
Popel, O.

Powiązania:

https://bibliotekanauki.pl/articles/1550379.pdf

Data publikacji:

2010-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.44.Fw
77.84.Fa
78.20.Ci

Opis:

The effect of uniaxial pressure ($σ_m$ ≤ 200 bar) on the spectral (300-800 nm) and temperature (77-300 K) dependences of the refractive indices of $Rb_{2}ZnCl_{4}$ crystals are investigated. The baric dependences of the electron polarizability, specific refraction and the parameters involved in the Sellmeier formula are calculated.

Źródło:

Acta Physica Polonica A; 2010, 117, 1; 136-138
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Nano-Bioceramic Synthesis from Tropical Sea Snail Shells (Tiger Cowrie - Cypraea Tigris) with Simple Chemical Treatment

Autorzy:

Şahin, Y.
Gündüz, O.
Bulut, B.
Özyeğin, L.
Gökçe, H.
Ağaoğulları, D.
Chou, J.
Kayalı, E.
Ben-Nissan, B.
Oktar, F.

Powiązania:

https://bibliotekanauki.pl/articles/1401280.pdf

Data publikacji:

2015-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.07.-b
87.68.+z
28.52.Fa

Opis:

In this study several bioceramic materials (i.e. hydroxyapatite, whitlockite) were prepared by using chemical synthesis method from sea snail shells (Tiger Cowrie - Cypraea Tigris), originated from Pacific Ocean. Marine shells usually present aragonite-calcite structures and generally, complicated and pressurized equipment is necessary to convert these structures into bioceramics. Instead of using complicated systems, a basic ultrasonic equipment and simple chemical synthesis method was used in the process. DTA analysis was performed to calculate the required amount of H₃PO₄ solution in order to set the appropriate stoichiometric ratio of Ca/P equal to 1.667 for HA bioceramic or to 1.5 for β-TCP bioceramic in the titration. The prepared batches were sintered at 800°C and 400°C for hydroxyapatite (HA) and β-tri calcium phosphate (β-TCP) forms respectively. X-ray diffraction analysis, scanning electron microscopy (SEM) and infrared observations (FTIR) were implemented for both TCP and HA bioceramics. By applying the chemical synthesis with basic ultrasonic equipment, this study proposes a simple way of production for nano-HA /TCP powders from a natural marine sources.

Źródło:

Acta Physica Polonica A; 2015, 127, 4; 1055-1058
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Second Law Analysis on an Air-Standard Miller Engine

Autorzy:

Ebrahimi, R.

Powiązania:

https://bibliotekanauki.pl/articles/1398906.pdf

Data publikacji:

2016-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.70.Ln
82.60.Fa
88.05.-b

Opis:

Performance analysis has been carried out for air-standard Miller engine using second law analysis. The relations of the second law efficiency versus compression ratio, the second law efficiency versus first law efficiency as well as the exergy versus compression ratio are obtained. The results show that the curve of second law efficiency versus first law efficiency is a parabolic-like one. The results also show that, throughout the compression ratio range, the second law efficiency increases when the expansion-compression ratio increases.

Źródło:

Acta Physica Polonica A; 2016, 129, 6; 1079-1082
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Thermodynamic Modeling of an Atkinson Cycle with respect to Relative Air-Fuel Ratio, Fuel Mass Flow Rate and Residual Gases

Autorzy:

Ebrahimi, R.

Powiązania:

https://bibliotekanauki.pl/articles/1399496.pdf

Data publikacji:

2013-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.70.Ln
82.60.Fa
88.05.-b

Opis:

The performance of an air standard Atkinson cycle is analyzed using finite-time thermodynamics. The results show that if the compression ratio is less than a certain value, the power output increases with increasing relative air-fuel ratio, while if the compression ratio exceeds a certain value, the power output first increases and then starts to decrease with increase of relative air-fuel ratio. With a further increase in compression ratio, the increase in relative air-fuel ratio results in decrease of the power output. Throughout the compression ratio range, the power output increases with increase of fuel mass flow rate. The results also show that if the compression ratio is less than a certain value, the power output increases with increase of residual gases, on the contrast, if the compression ratio exceeds a certain value, the power output decreases with increase of residual gases. The results obtained herein can provide guidance for the design of practical Atkinson engines.

Źródło:

Acta Physica Polonica A; 2013, 124, 1; 29-34
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Performance Analysis of a Diesel Cycle under the Restriction of Maximum Cycle Temperature with Considerations of Heat Loss, Friction, and Variable Specific Heats

Autorzy:

Hou, S.
Lin, J.

Powiązania:

https://bibliotekanauki.pl/articles/1492763.pdf

Data publikacji:

2011-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.70.Ln
82.60.Fa
88.05.-b

Opis:

The objective of this study is to examine the influences of heat loss characterized by a percentage of fuel's energy, friction and variable specific heats of working fluid on the performance of an air standard Diesel cycle with the restriction of maximum cycle temperature. A more realistic and precise relationship between the fuel's chemical energy and the heat leakage that is constituted on a pair of inequalities is derived through the resulting temperature. The variations in power output and thermal efficiency with compression ratio, and the relations between the power output and the thermal efficiency of the cycle are presented. The results show that the power output as well as the efficiency where maximum power output occurs will increase with the increase of maximum cycle temperature. The temperature-dependent specific heats of working fluid have a significant influence on the performance. The power output and the working range of the cycle increase while the efficiency decreases with increasing specific heats of working fluid. The friction loss has a negative effect on the performance. Therefore, the power output and efficiency of the cycle decrease with increasing friction loss. It is noteworthy that the effects of heat loss characterized by a percentage of fuel's energy, friction and variable specific heats of working fluid on the performance of a Diesel-cycle engine are significant and should be considered in practice cycle analysis. The results obtained in the present study are of importance to provide a good guidance for the performance evaluation and improvement of practical Diesel engines.

Źródło:

Acta Physica Polonica A; 2011, 120, 6; 979-986
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Intersubband Collective Modes in Multiwire SuPerlattices

Autorzy:

Załużny, M.

Powiązania:

https://bibliotekanauki.pl/articles/1920979.pdf

Data publikacji:

1992-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.65.Fa
73.20.Mf
78.30.Fs

Opis:

Intersubband plasma excitation spectrum of lateral multiwire superlattices is investigated theoretically within the random-phase approximation. We examine the role of an interwire electron-electron interaction in regard to the depolarization shift.

Źródło:

Acta Physica Polonica A; 1992, 82, 4; 627-629
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Rosyjskie firmy walczą o kontrakt na nowy myśliwiec

Autorzy:

Butowski, Piotr.

Powiązania:

Nowa Technika Wojskowa 2001, nr 7, s. 48-49

Data publikacji:

2001

Tematy:

PAK FA (samolot) projekty Rosja
Samoloty myśliwskie projekty Rosja

Opis:

Fot.

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 43.

Tytuł:

A study on carbonation depth prediction for concrete made with GBFS cement and FA addition
Badanie dotyczące prognozowania głębokości karbonatyzacji betonu wykonanego z cementu GBFS z dodatkiem FA

Autorzy:

Lech, Maciej
Juszczak, Tomasz
Wawrzeńczyk, Jerzy

Powiązania:

https://bibliotekanauki.pl/articles/2124786.pdf

Data publikacji:

2022

Wydawca:

Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw

Tematy:

concrete carbonation
carbonation model
carbonation accelerated testing
GBFS cement
FA addition
karbonatyzacja betonu
model karbonatyzacji
przyspieszone badania karbonatyzacji
cement GBFS
dodatek FA

Opis:

This paper presents the results of the examination of accelerated carbonation of concrete mixes made with CEM III / A blast furnace slag cement and the addition of fly ash. The test program was developed using an experiment design with two factors: a water-binder ratio and a fly-ash / cement ratio. Carbonation depth measurements were carried out according to FprCEN/TS 12390-12 (CO2 concentration = 4%, T = 20°C, RH = 55%). Associated tests were also carried out, including compressive strength, porosity, depth of absorption, water penetration depth, and capillary suction. Analysis of the test results allowed us to determine the influence of binder composition on concrete carbonization depth under standard test conditions. The results show that the carbonation depth increases along with the increase in the W/B ratio and as a result of the increase in the fly ash content in the binder. A mathematical model was developed to describe the carbonation process over time, which can predict the depth and rate of concrete carbonation. Furthermore, it was found that there is no close relationship between other properties tested (e.g. strength) and the depth of the carbonated concrete.
W pracy przedstawiono wyniki badań przyspieszonej karbonatyzacji mieszanek betonowych wytworzonych cementem żużlowym wielkopiecowym CEM III/A z dodatkiem popiołu lotnego. Program badań został opracowany na podstawie projektu eksperymentu z dwoma czynnikami: stosunkiem wody do spoiwa oraz stosunkiem popiołu lotnego do cementu. Pomiary głębokości karbonatyzacji przeprowadzono zgodnie z FprCEN/TS 12390-12 (stężenie CO2 = 4%, T = 20°C, RH = 55%). Przeprowadzono również powiązane testy, w tym wytrzymałości na ściskanie, porowatości, głębokości absorpcji, głębokości penetracji wody i ssania kapilarnego. Analiza wyników badań pozwoliła na określenie wpływu składu spoiwa na głębokość karbonatyzacji betonu w standardowych warunkach testowych. Wyniki wskazują, że wraz ze wzrostem stosunku W/B oraz zawartością popiołu lotnego w spoiwie wzrasta głębokość karbonatyzacji. Opracowano model matematyczny do opisu procesu karbonatyzacji w czasie, który umożliwia przewidywanie głębokości i szybkości karbonatyzacji betonu. Ponadto stwierdzono, że nie ma ścisłego związku między innymi badanymi właściwościami (np. wytrzymałością) a głębokością betonu karbonatyzowanego.

Źródło:

Structure and Environment; 2022, 14, 1; 1--10
2081-1500

Pojawia się w:

Structure and Environment

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Prawo jako narzędzie polityczne w chińskiej perspektywie legistycznej

Autorzy:

Michoński, Dominik

Powiązania:

https://bibliotekanauki.pl/articles/1811263.pdf

Data publikacji:

2019-12-11

Wydawca:

Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach

Tematy:

filozofia prawa
legizm
fa
filozofia chińska
legal philosophy
legalism
Chinese philosophy

Opis:

Niniejszy artykuł ma na celu zwięzłe przedstawienie chińskiego nurtu filozoficznego zwanego legizmem. Praca oparta jest przede wszystkim na autorskich tłumaczeniach klasycznych dzieł filozofii chińskiej oraz publikacjach naukowych pochodzących ze źródeł anglojęzycznych. W pracy opisano podstawowe dla nurtu legistycznego teorie i pojęcia, w tym ze szczególną wnikliwością przeanalizowano koncepcję prawa (fa) i podjęto próbę odniesienia jej zarówno do zapatrywań konfucjańskich, jak i do realiów europejskich.
This article aims to concisely present the thought of the Chinese legalist school of philosophy. The essay is based on translations of classical Chinese philosophical texts by the author and on academic publications in English. Basic legalist theories and notions are explained, and the concept of laws (fa) is analyzed with special care and compared with Confucian views and the European political reality.

Źródło:

DOCTRINA. Studia Społeczno-Polityczne; 2016, 13, 13; 133-155
1730-0274

Pojawia się w:

DOCTRINA. Studia Społeczno-Polityczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Inicjalizacja segmentacji k-means uwzględniająca rozkład gęstości pikseli

Autorzy:

Świta, R.
Suszyński, Z.

Powiązania:

https://bibliotekanauki.pl/articles/118366.pdf

Data publikacji:

2014

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

FA
KKZ
k-means
kmeans++
segmentacja
k-means ++
segmentation
High Density

Opis:

Artykuł przedstawia modyfikację inicjalizacji KKZ algorytmu k-means, uwzględniającą, oprócz wzajemnych odległości środków segmentów, również rozkład gęstości pikseli. Funkcja gęstości piksela jest sumą odwrotności odległości piksela od pozostałych i jest poddawana oszacowaniu na podstawie odległości piksela od wartości średniej i wariancji wartości pikseli. W eksperymentach segmentacji podlegały cztery różne sekwencje obrazów termicznych uzyskanych metodą termografii aktywnej. Pomimo dodatkowych obliczeń podczas inicjalizacji, metoda wykazała szybszą zbieżność algorytmu z czasami bardzo podobnymi do inicjalizacji KKZ, ale mniejszym błędem końcowym segmentacji.
This article presents a modification for the KKZ initialization of the k-means segmentation algorithm, which, in addition to the mutual distance of segments, takes into account the density of pixels. Pixel density is expressed asa sum of the inverse of the pixel’s distance to the other pixels and is subjected to estimation based on the distance from the mean and variance of the pixel values. In the experiments, four different sequences of thermal images were used, obtained using active thermography. Despite the additional calculations during initialization, method showed a faster convergence of the algorithm, with processing times very similar to the KKZ initialization, but with a lower final segmentation error.

Źródło:

Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej; 2014, 6; 89-98
1897-7421

Pojawia się w:

Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Power Optimization of a Miller Thermal Cycle with respect to Residual Gases and Equivalence Ratio

Autorzy:

Ebrahimi, R.

Powiązania:

https://bibliotekanauki.pl/articles/1399491.pdf

Data publikacji:

2013-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.70.Ln
82.60.Fa
88.05.-b
88.20.td

Opis:

The performance of an air standard Miller cycle is analyzed using finite-time thermodynamics. The relations between the power output and the compression ratio and between the power output and the thermal efficiency are derived by detailed numerical examples. The results show that, throughout the compression ratio range, the power output decreases with increasing residual gases. The results also show that if compression ratio is less than certain value, the power output decreases with increasing equivalence ratio, while if compression ratio exceeds certain value, the power output first increases and then starts to decrease with increasing equivalence ratio. The conclusions of this investigation are of importance when considering the designs of actual Miller engines.

Źródło:

Acta Physica Polonica A; 2013, 124, 1; 6-10
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

The Dielectric Studies of Ferroelectric [NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$]$\text{}_{3}$Sb$\text{}_{2}$Cl$\text{}_{9}$ Crystals under Moderate Pressure

Autorzy:

Zdanowska-Frączek, M.
Olszewski, M.
Frączek, Z. J.
Jakubas, R.

Powiązania:

https://bibliotekanauki.pl/articles/2047740.pdf

Data publikacji:

2007-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.45.Gm
77.84.Fa
77.22.Ch
77.80.Bh

Opis:

The effect of pressure on the dielectric properties of [NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$]$\text{}_{3}$Sb$\text{}_{2}$Cl$\text{}_{9}$ crystal was analyzed for a few values of hydrostatic pressure within the range from 0.1 MPa to 300 MPa and for temperatures from the range of 220-350 K. The measuring frequency was 1 kHz. The pressure-temperature phase diagram obtained was nonlinear. The temperature dielectric permittivity anomalies related to the paraelectric-ferroelectric phase transition temperature (T$\text{}_{c}$) gradually increase up to 66 MPa and then decrease with subsequent increase in pressure. The character of the temperature dielectric permittivity anomalies, typical of the continuous ferroelectric transition, remains unchanged with increasing pressure. Additionally, the pressure dependences of the Curie-Weiss constants for the crystal in paraelectric (C$\text{}_{+}$) and ferroelectric (C$\text{}_{-}$) phases were evaluated and discussed. The results indicated a complex mechanism of the ferroelectric phase transition.

Źródło:

Acta Physica Polonica A; 2007, 112, 3; 549-556
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Two-Dimensional Ising Model with Competing Interactions as a Model for Interacting π-Rings

Autorzy:

O'Hare, A.
Kusmartsev, F.
Kugel, K.

Powiązania:

https://bibliotekanauki.pl/articles/1810411.pdf

Data publikacji:

2009-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.50.+q
75.10.Hk
74.81.Fa
03.67.Lx

Opis:

We investigate the Ising model on a square lattice with antiferromagnetic exchange between nearest and next-nearest neighbors and show that at low temperatures stripe-like and droplet-like superstructures appear. We show that the competing interactions introduce a strong frustration that could plausibly describe the systems with dipole-dipole type interactions and pay particular attention to arrays of interacting Josephson π-rings.

Źródło:

Acta Physica Polonica A; 2009, 115, 1; 150-152
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Pojęcie Prawa (fa) w dziele „Prawo rytualne islamu” (Tianfang Dianli) Liu Zhi
Term Law (Fa) in the Work “Ritual Law of Islam” (Tianfang Dianli) of Liu Zhi

Autorzy:

Michoński, Dominik

Powiązania:

https://bibliotekanauki.pl/articles/578176.pdf

Data publikacji:

2016

Wydawca:

Polskie Towarzystwo Orientalistyczne

Tematy:

Han Kitab
Chinese philosophy
Sufism
Chinese Muslims
fa
Tianfang Dianli
Liu Zhi

Opis:

The article aims to briefly describe the cultural context and philosophical heritage of the Han Kitab literature. It also introduces the reader to the thought of China’s arguably most eloquent and innovative Sino-Islamic scholar, Liu Zhi. Liu’s multidimensional concepts are deeply rooted in the Chinese philosophical tradition (Confucianism, Legalism, Buddhism) while simultaneously borrowing heavily from the theology of Sufi Islam. The author aims to decode these diverse influences by focusing on a single concept – fa.

Źródło:

Przegląd Orientalistyczny; 2016, 3-4; 327-341
0033-2283

Pojawia się w:

Przegląd Orientalistyczny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Application of RRAP reliability optimization as a test of nature-inspired algorithms

Autorzy:

Pieprzycki, Adam
Filipowicz, Bogusław

Powiązania:

https://bibliotekanauki.pl/articles/35533466.pdf

Data publikacji:

2024-02-15

Wydawca:

Akademia Tarnowska

Tematy:

reliability optimization
RRAP
Firefly Algorithm (FA)
Cuckoo Search (CS)
ANOVA
Lévy flight

Opis:

This paper presents a discussion on the application of two swarm intelligence algorithms, Cuckoo Search (CS) and Firey Algorithm (FA), to maximize the reliability of two complex systems with resource constraints, which have been well-known in the literature. The reliability of the systems is also evaluated using several classical methods. The results indicate that although the CS algorithm, which utilizes Lévy flight, is eective, the FA rey algorithm outperformed it in the presented optimization tasks, within the given parameter range. These ndings contribute to the ongoing discussion on using nature-inspired algorithms for solving Reliability Redundancy Allocation Problem (RRAP) problems, and the two test scenarios used in the study can be useful for validating other algorithms in RRAP problems. The paper introduces metrics and methods for analyzing and comparing the performance of algorithms in RRAP optimization, including the comparison of criterion function values and other parameters introduced in the paper. Additionally, the paper discusses statistical analyses of variance (ANOVA) with post-hoc RIR Tuckey tests.

Źródło:

Science, Technology and Innovation; 2023, 18, 3-4; 1-14
2544-9125

Pojawia się w:

Science, Technology and Innovation

Dostawca treści:

Biblioteka Nauki

/5

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