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M.L. Lei, L. Chen and X.M. Xiong

References [1] P.G. de Gennes, Soft matter (Nobel lecture). Angewandte Chemie, International Edition in English 31(7) 842-845 (1992). [2] A.S. Nowick, B.S. Berry, Anelastic Relaxation in Crystalline Solids, Academic Press, 1972. [3] L.B. Magalas, Mechanical spectroscopy - Fundamentals, Sol. St. Phen. 89, 1-22 (2003). [4] S. Etienne, S. Elkoun, L. David, L.B. Magalas, Mechanical spectroscopy and other relaxation spectroscopies, Sol. St. Phen. 89, 31-66 (2003). [5] T.S. Kê

Open access

M.L. Nó, L. Dirand, A. Denquin and J. San Juan

, 2007. [18] I. Gutiérrez-Urrutia, M.L. Nó, E. Carreño-Morelli, B. Guisolan, R. Schaller, J. San Juan, High performance very low frequency pendulum, Mat. Sci. Eng. A 370, 435-439 (2004). [19] P. Simas, J. San Juan, R. Schaller, M.L. Nó, High-temperature mechanical spectrometer for internal friction measurements, Key Eng. Mater. 423, 89-95 (2010). [20] R.B. Perez-Saez, V. Recarte, M.L. Nó, J. San Juan, Anelastic contributions and transformed volume fraction during thermoelastic martensitic transformations, Phys. Rev. B 57

Open access

M. Sikoń

Theory and experimental verification of thermal stresses in Cosserat medium

An asymmetrical inter-atomic action, basic for a thermal couple stress presence, has been investigated in this work. A mechanical description of a Cosserat thermoelasticity is replaced by an equivalent magnetic representation. Then, a magnetization of a medium is analyzed. An experimental demonstration of the occurrence of the non-central load of the atom has been made applying the Electron Paramagnetic Resonance spectrometer. The mathematical model of the measurements has been presented in form of Bloch equations with extension to Cosserat medium.

Open access

R. Zachariasz, D. Bochenek and B. Bruś

Abstract

An aim of this work was to determine an influence of an admixture, the chromium (for x from 0.01 to 0.06), on the mechanical properties of the PFN ceramics. The ceramics with chemical composition Pb(Fe0.5−xCrxNb0.5)O3 was synthesized in two steps from simple oxides PbO, Fe2O3, Nb2O5, Cr2O3. The first stage was based on obtaining the FeNbO4 from the Fe2O3 and Nb2O5 simple oxides. At this stage an admixture in a form the Cr2O3 chromium oxide was added to the solution. In the second stage the PbO lead oxide and the doped FeNbO4 (obtained earlier) were synthetized. The sintering of ceramic samples PFCN type was carried out by free sintering method. Temperature measurements of the internal friction were conducted on a computer-controlled automatic resonant mechanical spectrometer (heating cycle with 3 deg/min).

Open access

L.B. Magalas

REFERENCES [1] L.B. Magalas, M. Majewski, Toward high-resolution mechanical spectroscopy HRMS. Logarithmic decrement, Sol. St. Phen. 184 , 467-472 (2012). [2] L.B. Magalas, M. Majewski, Toward high-resolution mechanical spectroscopy HRMS. Resonant frequency – Young’s modulus, Sol. St. Phen. 184 , 473-478 (2012). [3] M. Majewski, A. Piłat, L.B. Magalas, Advances in computational high-resolution mechanical spectroscopy HRMS. Part 1 – Logarithmic decrement, IOP Conf. Series: Materials Science and Engineering 31 , 012018 (2012). [4] M

Open access

M. Sikoń

Quantum analysis of the Cosserat media with application to paramagnetic resonance

This work is a continuation of the investigation which first results were presented in the Bulletin of the Polish Academy of Sciences: Technical Sciences in 2009. In the work the Cosserat medium is defined there, where inter-atomic actions have non-central nature. Non-central potential energy is introduced. As regards the Schrödinger equation the energetic state of the atom is described in the field of the quantum mechanics. The analysis is carried out on the base of mechanical and magnetic properties of the atom. The obtained solution is applied to write the resonance condition in the EPR spectrometer. The spectra, obtained for a loaded hydrated copper sulfate, were interpreted from the point of view of the presented theory and experimental parameters of the Cosserat medium were written.

Open access

B. Kościelniak, S. Roskosz and J. Cwajna

Abstract

The IN713C is nickel-based superalloy, used to produce low pressure turbine blades in a process of investment casting. However, porosity which is formed during the casting, decreases mechanical properties of IN713C. Therefore, to eliminate porosity, a process of hot isostatic pressing was applied. Nonetheless, HIP also least to some changes in the microstructure of tested material. The main aim of this paper is to characterize the morphology of carbides before and after hot isostatic pressing. Microstructural characterization was carried out with the use of a scanning electron microscope equipped with an energy dispersive X-ray spectrometer and an electron backscatter diffraction detector. The size and shape of carbides were evaluated by quantitative metallography methods methods. The results show that the amount, size and heterogeneity of arrangement of the carbides increased after application of HIP treatment.

Open access

Yan Xizheng, Liza Valentín-Blasini, Clifford Watson and Roberto Bravo Cardenas

Summary

Glycerol, and 1,2-propylene glycol are the humectants most commonly used by the tobacco industry. They are found in a variety of tobacco products and are often present at high levels (~2–5 % w/w). While humectants are generally considered safe, they may serve as precursors in the formation of harmful carbonyl compounds. A selective, precise, and sensitive method for the quantification of several humectants in cigarette filler was developed. The method’s sample clean-up is a two-step process consisting of a mechanical extraction, followed by solid phase extraction. Individual humectants are separated, identified, and measured using liquid chromatography coupled to a single quadrupole mass spectrometer as the detector (LC/MS). Detection limits were 0.105, 0.575, and 0.039 mg/cigarette for glycerol, 1,2-propylene glycol and triethylene glycol, respectively. The quantification range for these analytes was 0.4–75.0 mg/cigarette. Twenty-seven brands of domestic commercial cigarettes were evaluated to assess typical levels of humectants in the tobacco filler.

Open access

Agata Dudek and Rafał Kobyłecki

, Varazdin, Croatia, 210-215. Leckner, B., Szentannai, P., Winter, F., 2011. Scale-up of fluidized-bed combustion-a review . Fuel, 90(10), 2951-2964. DOI: 10.1016/j.fuel.2011.04.038 Maszke, A., Dwornicka, R., Ulewicz, R., 2018, Problems in the implementation of the lean concept at a steel works – Case study . MATEC Web Conf., 183, art. 01014. DOI: 10.1051/matecconf/201818301014 Mazur, M., Kucharikova, L., Tillova, E., Chalupova, M., 2018. A change of mechanical properties of the self-hardening UNIFONT 90 due to temperature . Mater. Res. Proc., 5, 136

Open access

Milan Pavùk, Jozef Sitek and Katarína Sedlačková

References [1] ŠKORVNEK, I.-GERLING, R.-GRAF, T.-FRICKE, M. -HESSE, J. : Neutron Irradiation Effects on the Structural, Magnetic and Mechanical Properties of Amorphous and Nanocrystalline Fe73.5Cu1Nb3Si13.5B9 , IEEE Transactions on Magnetics 30 No. 2 (1994), 548-551. [2] DUBEY, R.-GUPTA, A.-SHARMA, P.-DAROWSKI, N.- SCHUMACHER, G. : Tailoring of Magnetic Anisotropy in Amorphous and Nanocrystalline Soft Magnetic Alloys using Swift Heavy Ions, Journal of Magnetism and Magnetic Materials 310 No. 2 (2007), 2491