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Dielectric behaviors at microwave frequencies and Mossbauer effects of chalcedony, agate, and zultanite

Chinese Physics B 2015年第5期24卷 649-655页

作者： Levent Paral? Israfil Sabikoglu Jiri Tucek Jiri Pechousek petr novak Jakub Navarik Celal Bayar University Departments of Electronics and Automation Celal Bayar University Faculty of Arts and Sciences Department of Physics Muradiye Regional Centre of Advanced Technologies and Materials Department of Experimental Physics Faculty of SciencePalacky University

In this study, dielectric properties within 8-12 GHz microwave frequencies, inductively coupled plasma-atomic emis- sion spectrometry, Fourier transform infrared spectrometry, synchronized two thermal analyses, and 57Fe Mossbauer spectroscopy analysis of chalcedony, agate, and zultanite samples from Turkey are presented. Agate and chalcedony show the same nine vibrational absorption peaks obtained unlike zultanite from FTIR spectra in the 350 cm-1 to 4000 cm-1 range, ε＇ values of chalcedony, agate and zultanite derived at 10.5 GHz were 4.67, 4.41, and 7.34, respectively, eI and e~ values of the studied samples at the microwave frequencies are related to the percentage weight of their constituent parts in their chemical compositions. 57Fe Mossbauer spectroscopy results confirm the existence of iron-containing islands in the crystal structure of zultanite, agate, and chalcedony samples, equipped them with magnetic features typical for magnetic nanoparticles including superparamagnetism. The presence of iron-containing islands significantly affects the magnetic, dielectric, and optical properties of studied samples that are not observed for pure minerals without any foreign inclusions.

关键词： zultanite agate chalcedony microwave dielectric properties Mossbauer effects

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The effect of neodymium substitution on the structural and magnetic properties of nickel ferrite

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Progress in Natural Science:Materials International 2015年第3期25卷 215-221页

作者： ?srafil ?abiko?lu Levent Paral? Ondrej Malina petr novak Josef Kaslik Jiri Tucek Jiri Pechousek Jakub Navarik Oldrich Schneeweiss Celal Bayar University Faculty of Arts&SciencesDepartment of Physics 45140 Muradiye Celal Bayar University Department of Electronics and Automation Regional Centre of Advanced Technologies and Materials Department of Experimental Physics and Physical ChemistryFaculty of SciencePalacky University Institute of Physics of Materials of the Academy of Sciences of the Czech Republic

Nickel ferrite Ni Fe2O4 is a typical soft magnetic ferrite with high electrical resistivity used as high frequency magnetic material. Neodymium(Nd3+) doped Ni Fe2O4 materials were fabricated using solid state reaction. The properties of the obtained material were investigated by X-Ray Diffraction(XRD), Scanning Electron Microscope(SEM), Fourier-Transform Infrared Spectroscopy(FT-IR), magnetic measurements on SQUID and M?ssbauer spectroscopy. It was found that the material consists of two different phases: Nd3+doped Ni Fet2O4and Nd Fe O3. The Nd3 ions occupy cation sites of the Ni Fe2O4 inverse spinel structure. NdFeO3 phase occurred when the level of Nd3+atoms exceed a percolation *** presence of both phases was confirmed by SEM observations. The M?ssbauer spectra analysis showed two sextets, which can be ascribed to iron atoms in tetrahedral and octahedral positions. From their intensities it is concluded that Nd3+occupies octahedral sites in the spinel structure of Ni Fe2O4, which were originally occupied by Ni2+.

关键词： NiFe2O4 Neodymium Solid-state reaction Magnetic properties M?ssbauer spectroscopy

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Antibacterial properties of lucifensin in Lucilia sericata maggots after septic injury

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Asian Pacific Journal of Tropical Biomedicine 2014年第5期4卷 358-361页

作者： Ivana Valachova Emanuel Prochazka Jana Bohova petr novak Peter Takac Juraj Majtan Institute of Zoology Slovak Academy of Sciences Institute of Microbiology Academy of Sciences of the Czech Republic Scientica s.r.o.

Objective:To investigate the antibacterial properties of lucifensin in maggots of IjicUia sericala after septic ***:In our preliminary study we have shown that injuring the maggots with a needle soaked in lipopolysaccharide solution induced within 24 h lucifensin expression in the fat body and in the grease coupler of the salivary *** is assumed that lucifensin is secreted solely from this tissue into the haemoiymph(similar to other insect defensins) and not into secreted/excreted *** used high-performance liquid chromatography fractionation and radial diffusion assay to investigate the antibacterial properties of haemoiymph extracted from larvae after septic ***:After septic injury,production of lucifensin in the haemoiymph is *** led to higher antibacterial activity of such haemoiymph in comparison to non-stimulated ***:These results suggest that beside the previously demonstrated role of lucifensin in the debridement therapy,lucifensin is simultaneously important as a part of the systematic immune response.

关键词： Lucilia sericata Wound bacteria Defensin Lucifensin Immune-challenge

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Real-World Safety and Performance of Saline Nasal Spray Products for Nasal Cleansing and Reducing Obstruction of the Nasal Cavity

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Open Journal of Respiratory Diseases 2023年第4期13卷 65-79页

作者： Mathieu M. Albasser Gary Smith Mariane Ballerini Fernandes Nisha Patel petr novak Martina Hagen GSK Consumer Healthcare SARL a Haleon company Nyon Switzerland Haleon Weybridge Surrey UK GSK Kingston upon Thames London UK Haleon Prague Czech Republic

Background and Objectives: Three post-marketing clinical follow-up studies were performed in Europe to confirm the safety and performance of four nonprescription, nasal cleansing medical devices: Otrivin Sea Water (OSW) pressurized spray, OSW with aloe vera (OSWAV), Otrisal 0.74% NaCl Metered-Dose Spray (MDS), and Prorhinel spray. Material and Methods: Observational, single-arm, retrospective studies consisting of a single online questionnaire were performed between July 2021 and December 2021. Eligible participants were adults who used the device or supervised use of the device in a participant under 18 years of age within 6 months of completing the questionnaire. Demographics, safety, and device performance were assessed. Results: Based on questionnaires submitted on OSW (n = 556), OSWAV (n = 555), Otrisal MDS (n = 555), and Prorhinel (n = 555), proportions of users who reported safety events were 1.8% for OSW, 2.3% for OSWAV, 1.4% for Otrisal MDS, and 2.0% for Prorhinel. Proportions of users who indicated they were satisfied or very satisfied with device performance ranged from 72.0% - 89.0% across all devices. Device performance for all products was also supported for additional preventative and symptomatic uses through exploratory analyses. Conclusions and Significance: These data confirm device safety and performance of OSW, OSWAV, Otrisal MDS, and Prorhinel for their intended uses.

关键词： Saline Solution Sodium Chloride Common Cold Allergens Postmarketing Product Surveillance

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Real-World Safety and Performance of Saline Nasal Spray Products for Nasal Cleansing and Reducing Obstruction of the Nasal Cavity

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Open Journal of Respiratory Diseases（呼吸病期刊） 2023年第4期

作者： Mathieu M.Albasser Gary Smith Mariane Ballerini Fernandes Nisha Patel petr novak Martina Hagen

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FEM Study of the Strain Kinematics in the 3D Nanofibrous Structure Prepared by the Electrospinning Process

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Applied Mathematics 2013年第5期4卷 80-90页

作者： Michal petru Ondrej novak David Vejrych petr Lepsik Institute for Nanomaterials Advanced Technologies and InovationTechnical University of LiberecLiberecCzech Republic Department of Nonwovens Technical University of LiberecLiberecCzech Republic Department of Machine Elements and Mechanism Technical University of LiberecLiberecCzech Republic

Finite element model (FEM) was used for the study and description of the arising 3D nanofiber structure strain caused by the pressure of the flowing gas. Computer simulation using an adaptive networking through implicit FEM algorithm can be utilized for a significant improvement of the study of anisotropic strain in the deformed 3D nanostructure. The created model is based on the empirical Laplace-Poisson differential equation for the flow, where gas particles are moving with certain kinetic energy. The kinetic energy depends on the speed, time and temperature and affects the resulting strain of 3D nanofiber structure. The simulation results were compared to the results obtained from the image analysis of real samples and showed that this FEM model can determine individual phases of structure strain. The comparison shows that the developed FEM model can be an important tool in the study of the strain in the arising 3D nano- fiber structure and it can provide valuable information for optimization of 3D nanofiber structure production by the electrospinning process.

关键词： FEM Strain 3D Nanofibrous Structure Electrospinning Gas Flow

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