Fractal Nature Complex Correction an Inductivity

The microstructures properties predicting are based on their materials characteristics. In ceramic materials, regarding higher miniaturization and integrations, the structure analysis is very important. The main contribution of this research is related to relation between perovscites ceramics electronic properties, especially BaTiO3 and NZT-ceramics and structural characteristics. We applied advanced analysis, based on fractal nature and introduced complex fractal correction in defining the very important electromagnetic parameter inductivity (L). The samples consolidation includes both, powder pressing (cold sintering) and hot sintering. The fractal characterization performs very important role from powders up to the final structures, through which exists structure influence on electro-physical and other ceramic properties. We report the experimental results of BaTiO3 and NZT-ceramics processing. Also, this is the first time that we apply complex fractal correction (influence of grains and pore surface and as well as particles Brownian motion) on fundamental thermodynamic temperature in Currie-Weiss law. This application includes the influence of Housdorff dimension (DH) from the microstructure images and connect fractal corrections in Currie-Weiss law, for relative dielectric constant ϵr and magnetic permeability μr. Through ϵr and μr, on this way, for the first time in this scientific area, we present direct relation to inductivity. This complex relation opens quit new advance understanding in structures and parameters in area of ferroelectic-magnetic applications in telecommunications, by introducing the fractals.acceptedVersionPeer reviewe

RECURRENT WOMEN'S GENITAL CANDIDOSIS - HUMORAL IMMUNITY

The first explorations of the women's vaginal mucosa were devoted to thehumoral immunity study. There are few studies conceming the role of specific serumand secretion immunoglobulins in women with recurrent genital candidosis (RGC).The aim of the paper was to detect the antiCandida TgG and IgA antibodies in theexamined woman's blood in order to determine a possible causal relation between the findings of the specific immunoglobulin and those of the fungi of the Candida sort inthe woman's genital tract. The examined test group for the serological analyzescomprised 60 women with the RGC, namely, those having a positive finding of theCandida albicans in their vaginal secretion. The control group consisted of 60 chosenwomen with no finding of the Candida sp. infection/colonization of the genital tract.The specific antiCandida IgG and IgA antibodies in the examineđ women's bloodwere detennined by a non standard zed indirect immunofluorescent test. The specificanti Candida IgG antibodies were confirmed in 90% of the women with the RGC andin 45% of the control group women. The IgA specific immunoglobulins were foundin 12 women of the test group and only in one woman of the control group. The lowertiter of the IgG antibodies was proved in approximately the same number of womenof both the examined groups. A higher titer of the IgG antibodies was found in aconsiderably greater number of women with chronic fungi genital infection (34) withrespect to the control group women (9)

Sintering parameters influence on dielectric properties of modified nano-BaTiO3 ceramics

BaTiO3 (BTO) is considered the most commonly used ceramic material in multilayer ceramic capacitors due to its desirable dielectric properties. Considering that the miniaturization of electronic devices represents an expanding field of research, modification of BTO has been performed to increase dielectric constant and DC bias characteristic/sensitivity. This research presents the effect of N2 and air atmospheres on morphological and dielectric properties of BTO nanoparticles modified with organometallic salt at sintering temperatures of 1200◦C, 1250◦C, 1300◦C, and 1350◦C. Measured dielectric constants were up to 35,000, with achieved very high values in both atmospheres. Field emission scanning electron microscopy (FESEM) was used for morphological characterization, revealing a porous structure in all the samples. The software image analysis of FESEM images showed a connection between particle and pore size distribution, as well as porosity. Based on the data from the image analysis, the prediction of dielectric properties in relation to morphology indicated that yttrium-based organometallic salt reduced oxygen vacancy generation in N2 atmosphere. DC bias sensitivity measurements showed that samples with higher dielectric constant had more pronounced sensitivity to voltage change, but most of the samples were stable up to 100 V, making our modified BTO a promising candidate for capacitors

The use of mobile-aided learning in education of local anesthesia for the inferior alveolar nerve block

© 2020 Inst. Sci. inf., Univ. Defence in Belgrade. All rights reserved. Background/Aim. Dental education has developed over the years, and various technologies have been included. Considering the fact that mobile devices are an imperative of modern time, the aim of our research was to evaluate effectiveness of Mobile-Aided Learning on practical administering the inferior alveolar nerve block (IANB). Methods. This prospective study involved 34 students who were randomly divided into two groups: G1 (control) group with 16 students and G2 (study) group with 18 students. Students of both groups previously successfully completed theoretical and practical training provided by the curriculum. For the purpose of additional education, students of the G2 group used a mobile application for 3D simulation of local anesthesia (Mobile-Aided Learning) outside the dental office for a period of one semester. After that, all students completed a post-clinical questionnaire. Results. The average time for performing anesthesia by participants in the G1 group was 70.54 ± 20.16 seconds, while in the G2 group it was 57.13 ± 17.45 seconds, which was significantly shorter (p < 0.05). A successful anesthesia application was higher in the G2 group (83.3%) compared to the G1 group (75%). The results of the post-clinical test questionnaire also indicated difference in the mean values of the responses to all questions, which was in favor of the G2 group participants. Conclusion. Application of Mobile-Aided Learning showed a significantly higher efficiency in student education for practical implementation of the IANB

Structural Properties of the Multiwall Carbon Nanotubes/Poly(Methyl Methacrylate) Nanocomposites: Effect of the Multiwall Carbon Nanotubes Covalent Functionalization

The structural characteristics of polymer nanocomposites with functionalized multiwall carbon nanotubes (MWCNTs) in poly(methyl methacrylate) matrix have been studied in relation to nanofiller loading and surface functionality. Different functional groups have been covalently attached on the MWCNTs sidewalls in order to induce interfacial interactions at nanofiller/polymer interface, which resulted in an improved nanomechanical features. Structural properties of nanocomposites, studied with XRD and Raman analysis, indicated the most pronounced decrease in a degree of amorphousness for samples containing 0.5 and 1 wt% of MWCNTs functionalized with dapsone (dapson-MWCNT) and diethyl malonate (dem-MWCNT). SEM and TEM micrographs confirmed improved dispersibility of the MWCNTs modified with aromatic structure of dapsone inside PMMA matrix. A significant increase in a glass transition temperature of over 60 degrees C has been found for the 1 wt% dapson-MWCNT nanocomposite. Additional modification of dapson-MWCNT by further increasing aromaticity and voluminosity of attached moiety (fid-MWCNT), showed 30 degrees C increases in a glass transition temperature at 4 wt% of nanofiller loading, which is similar to shift of 37 degrees C with loading of MWCNTs modified with ester terminal group. A maximum increase of 56% of reduced modulus and 86% of hardness was obtained for 1 wt% loading of dapson-MWCNT nanofiller