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Hydrazine synthesis of Ca0.9Er0.1MnO3 nanopowders
No full textThe hydrazine nitrate process (HNP) was used to synthesize nanostructured
Ca0.9Er0.1MnO3 powder, as it proved to be the easiest and most efficient method
acceptable for controlling composition and morphology. HNP is a combustion process
that is a promising method for controlling stoichiometry, homogeneity, and purity. To
prepare technologically important nanostructured Ca0.9Er0.1MnO3, metal nitrates and
hydrazine were mixed in a stoichiometric ratio 1 : 1/3. The resulting powder was then
annealed at different temperature intervals (800, 900 and 1000 °C), changing the color of
the synthesized sample from darker to lighter shades after the heating treatment. The
resulting sample was then characterized by X-ray diffraction (XRD) and Fourier
transform infrared spectroscopy (FTIR). The obtained results show that below 900 °C,
the reaction is incomplete.16th ECerS Conference for Young Scientists in Ceramics, October 15-18, 2025, Novi Sad, Serbia
Comprehensive Assessment of Heavy Metal(loid) Pollution in Agricultural and Urban Soils near an Oil Refining Facility: Distribution Patterns, Source Apportionment, Ecological Impact, and Probabilistic Health Risk Analysis
No full textThis study investigated the spatial distribution of HMs in agricultural and urban soils near the largest oil refining complex in Serbia, identified pollution sources, and assessed ecological and human health risks. A large fraction of soil samples showed elevated Hg (40% of samples), Pb (53%), Cd (90%), and As (93%) concentrations compared to the background levels. Hotspots for Pb, As, Hg, Cd, and Zn were observed in the industrial area, indicating significant anthropogenic input. Multivariate analysis, including PMF, revealed four contamination sources: emissions from the oil refining industry, agricultural activities, traffic emissions, and natural background. The pollution indices mostly fell into the moderate pollution range, with As, Hg, and Cd showing the highest enrichment. The potential ecological risk index (RI) indicated that about one-third of the samples had moderate ecological risk and determined a major RI hotspot near the refinery. The health risk assessment identified As and Cr as the largest contributors to non-carcinogenic risk, although the average HI was below one. Monte Carlo simulation confirmed that adults and children had negligible health risks at the 95th percentile and highlighted exposure frequency and body weight as the most influential exposure parameters. Based on source-specific risk, the oil refining industry emissions had the highest impact on HI and TCR values
Electrical Analogy Approach to Fractional Heat Conduction Models
No full textFractional heat conduction models extend classical formulations by incorporating fractional differential operators that capture multiscale relaxation effects. In this work, we introduce an electrical analogy that represents the action of these operators via generalized longitudinal impedance and admittance elements, thereby clarifying their physical role in energy transfer: fractional derivatives account for the redistribution of heat accumulation and dissipation within micro-scale heterogeneous structures. This analogy unifies different classes of fractional models—diffusive, wave-like, and mixed—as well as distinct fractional operator types, including the Caputo and Atangana–Baleanu forms. It also provides a general computational methodology for solving heat conduction problems through the concept of thermal impedance, defined as the ratio of surface temperature variations (relative to ambient equilibrium) to the applied heat flux. The approach is illustrated for a semi-infinite sample, where different models and operators are shown to generate characteristic spectral patterns in thermal impedance. By linking these spectral signatures of microstructural relaxation to experimentally measurable quantities, the framework not only establishes a unified theoretical foundation but also offers a practical computational tool for identifying relaxation mechanisms through impedance analysis in microscale thermal transport
Summary with concluding remarks, and future perspective
No full textThis book explores the molecular world reactive oxygen species (ROS) and its effects on health conditions, including cardiometabolic syndrome, neuronal diseases, and cancer. Through a series of carefully designed sections, it discusses ROS's duality as important signaling molecules and potential inducers of cellular damage
Functionalization of nanomaterials with polyether ether ketone
No full textPolyether ether ketone (PEEK) is a class of organic thermoplastic polymers that is colorless and utilized predominantly in engineering applications. PEEK possesses numerous fascinating physical, mechanical, and electrical characteristics, as well as chemical resistance. This chapter discusses many facets of polymer nanocomposites, following a timeline through the last 10 years, using PEEK as the matrix. Special attention will be paid to the methods for the PEEK functionalization with different carbon-based and other nanomaterials. Since the PEEK matrix nanomaterial composites have a variety of uses, the final part of the chapter will focus on their evaluation. Although expensive, the PEEK material is excellent for producing a number of specific products, including satellite components, bio-implants, and wear-resistant parts
Dataset comprising extracted R, G, and B components for assessment of remote photopletismography
No full textThis repository contains raw Red (R), Green (G), and Blue (B) components for remote assessment of Pulse Rate (PR). The results of analysis of video signals for noncontact PR assessment are presented in a paper titled "Contactless Pulse Rate Assessment: Results and Insights for Application in Driving Simulators" and published in Applied Sciences journal in 2025. File "RGB dataset.7z" contains 79 compressed .csv (comma-separated values) files for different video files obtained. Each .csv file contains the following columns: Timestamp_HR - timestamp in the UNIX format of the Heart Rate (HR) measurement from Empatica E4 device HR - HR measured at the time indicated by Timestamp_HR by Empatica E4 device in beats per minute (bpm) units Timestamp_BVP - timestamp in the UNIX format of the Blood Volume Pulse (BVP) signal from Empatica E4 device BVP - instantaneous value of the BVP signal, centered around zero and measured using Empatica E4 device (there is no unit for BVP, it is gien in relative signal amplitude) Timestamp_RGB - timestamp of the RGB values assessed from the facial videos in seconds R - average intensity value of the R component from the facial region of interest at the Timestamp_RGB (there is no unit for R component) G - G component at the Timestamp_RGB B - B component at the Timestamp_RGB Acknowledgments: We express our deep gratitude to Jelena Medarević, from the Faculty of Electrical Engineering, University of Ljubljana for her valuable ideas regarding the analysis of signals from the Empatica E4 sensor and for providing us with additional data for assessing Empatica E4 bias (we cite her paper). During the preparation of this study, the first author utilized GPT3.5 (ChatGPT) to enhance clarity and language and the first author is fully responsible for the publication content after using this tool. Funding: Nadica Miljković was financially supported by the Ministry of Science, Technological Development and Innovation of the Republic of Serbia under contract No. 451-03-137/2025-03/200103. The work presented in this paper was financially supported by the Slovenian Research Agency within program ICT4QL, grant no. P2-0246 for Kristina Stojmenova Pečečnik and Jaka Sodnik. Citing Instructions: If you find these data useful for your lecture(s) and/or research, please cite both journal paper and Zenodo repository as: Nešković ĐD, Stojmenova Pečečnik K, Sodnik J, Miljković N. Dataset comprising extracted R, G, and B components for assessment of remote photopletismography (Version 1) [Data set]. Zenodo. 2025. https://doi.org/10.5281/zenodo.16414188 Nešković ĐD, Stojmenova Pečečnik K, Sodnik J, Miljković N. Contactless Pulse Rate Assessment: Results and Insights for Application in Driving Simulators. Applied Sciences. 2025; 15(17):9512. https://doi.org/10.3390/app15179512Research data for the article: Nešković, Đ. D., Stojmenova Pečečnik, K., Sodnik, J., & Miljković, N. (2025). Contactless Pulse Rate Assessment: Results and Insights for Application in Driving Simulators. Applied Sciences, 15(17), 9512. [http://dx.doi.org/10.3390/app15179512
Repetitive transcranial magnetic stimulation as a universal modulator of synaptic plasticity: Bridging the gap between functional and structural plasticity
No full textRepetitive transcranial magnetic stimulation (rTMS) is a painless and non-invasive technique for neuromodulation that has shown great potential in therapy of several neurodegenerative and neuropsychiatric disorders both in patients and animal models. In addition to its non-invasiveness, the main rationale for using it for these disorders is that the positive effects extend beyond the stimulation period and can last up to several minutes, hours or even days after the last application. While the mechanisms underlying these long-lasting positive effects have not yet been fully deciphered, current literature supports hypothesis of modulation of both functional and structural plasticity. Dendritic spines are structures on dendritic branches that regulate synaptic transmission at the level of postsynapse and represent one of the structural and functional carriers of synaptic plasticity. Since rTMS has been proposed to induce long-term potentiation/long-term depression-like effects, based on the existing literature in animal studies, we suggest several molecular mechanisms which could underpin rTMS-induced structural plasticity manifested at the level of dendritic spines that include processes starting from spinogenesis to gradual spine maturation and eventual spine shrinkage and loss. The results gathered in this review postulate rTMS as a universal modulator of synaptic plasticity, which could guide future research and help in optimizing appropriate protocols of transcranial magnetic stimulation for adequate disorders and pathologies. © 2025 Elsevier Lt
Degradation of Bisphenol A by Electrochemical Advanced Oxidation Processes
No full textБисфенол А (енгл. Bisphenol A, BPA) је индустријски значајано органско једињење, широко коришћено у производњи поликарбонатних пластика и епоксидних смола. Његова присутност у воденим екосистемима резултат је антропогеног уноса путем отпадних вода индустријског и комуналног порекла. Као доказани ендокрини дисруптор, BPA представља озбиљан еколошки и здравствени ризик, што намеће потребу за развојем ефикасних и одрживих метода за његово уклањање. Циљ докторске дисертације је испитивање могућности примене аноде калај(IV)-оксид – вишеслојне угљеничне наноцеви на подлози од нерђајућег челика (SS/SnO2-MWCNT) у електрохемијским унапређеним оксидационим процесима (енгл. Electrochemical Advanced Oxidation Processes, EAOPs) за пречишћавање отпадних вода загађених бисфенолом А. Истраживање је спроведено кроз неколико фаза. У првој фази извршена је структурна и морфолошка карактеризација синтетисаног нанокомпозита, као и електрохемијска анализа SS/SnO2-MWCNT аноде применом цикличне волтаметрије, линеарне волтаметрије и спектроскопије електрохемијске импедансне. Друга фаза истраживања била је усмерена на процену ефикасности анодне оксидације и електро-Фентоновог процеса у модел раствору отпадних вода са високим садржајем сулфата. Оптимизована је густина струје као кључни параметар за ефикасну деградацију BPA, док је кинетика реакције показала да процес следи псеудо-први ред. Детаљно је анализиран механизам деградације BPA, укључујући и реактивне кисеоничне врсте (⦁OH, SO4•¯, 1O2) које учествују у процесу деградације. Упоређена је оксидација бисфенола А EAOPs методама у двоелектродном неподељеном електрохемијском систему са SS/SnO2-MWCNT анодом, при чему су анализирани степен деградације BPA, време потребно за потпуну минерализацију и енергетска ефикасност процеса. Завршни део истраживања обухватио је процену токсичности насталих интермедијера применом софтверских алата у циљу евалуације потенцијалних еколошких ризика. Ови резултати потврђују да је примена SS/SnO2-MWCNT анода током EAOPs процеса ефикасна и одржива стратегија за уклањање BPA из воде.Bisphenol A (BPA) is an industrially significant organic compound widely used in the production of polycarbonate plastics and epoxy resins. Its presence in aquatic ecosystems is a result of anthropogenic input through industrial and municipal wastewater. As a proven endocrine disruptor, BPA poses a serious environmental and health risk, which necessitates the development of effective and sustainable methods for its removal. The aim of this doctoral dissertation is to investigate the potential application of a tin(IV) oxide–multi-walled carbon nanotube anode on a stainless steel substrate (SS/SnO2-MWCNT) in electrochemical advanced oxidation processes (EAOPs) for the treatment of wastewater contaminated with bisphenol A. The research was conducted in several phases. In the first phase, structural and morphological characterization of the synthesized nanocomposite was performed, as well as electrochemical analysis of the SS/SnO2-MWCNT anode using cyclic voltammetry, linear voltammetry, and electrochemical impedance spectroscopy. The second phase of the study focused on evaluating the efficiency of anodic oxidation and the electro-Fenton process in a model wastewater solution with a high sulfate content. Current density was optimized as a key parameter for effective BPA degradation, and the reaction kinetics indicated that the process follows a pseudo-first-order model. The BPA degradation mechanism was thoroughly analyzed, including the role of reactive oxygen species (•OH, SO4•¯, 1O2) involved in the degradation process. The oxidation of bisphenol A by EAOP methods was compared in a two-electrode undivided electrochemical system using the SS/SnO2-MWCNT anode, with analysis of BPA degradation efficiency, time required for complete mineralization, and energy efficiency of the processes. The final part of the research involved an assessment of the toxicity of the formed intermediates using software tools to evaluate potential environmental risks. These results confirm that the use of SS/SnO2-MWCNT anodes in EAOPs is an effective and sustainable strategy for the removal of BPA from water
Electrochemical characteristics of LiV2O5 cathode material in aqueous and non-aqueous electrolyte
No full textAdvanced Ceramics and Application : 13th Serbian Ceramic Society Conference : Program and the Book of Abstracts; September 8-10, 2025; Belgrade
Luminescence thermometry of SrGd2O4: Yb, Tm up-conversion nanoparticles
No full textWhen employing the remote operation mode, luminescence thermometry is a useful technique for measuring temperature. The modified sol-gel process was used to create a series of Tm3+ (1 at%) and Yb3+ (2, 4, and 6 at%) doped SrGd2O4 up-conversion (UC) nanoparticles, which were then thoroughly characterized to optimize their composition and optical characteristics. Regardless of stoichiometry, XRPD, TEM/HRTEM, and STEM/EDS investigation verified the crystallization of single-phase nanoparticles with homogeneous doping in every sample. The ideal sensitizer doping concentration is 4 at%, as demonstrated by the UC emissions obtained under 976 nm excitation, which showed typical Tm3+ transitions. For this material, the emission seen in the Vis part of the up-conversion spectra was found to have a lifetime of 342 μs and a total quantum yield of 1.12% at ambient temperature. Its exceptional temperature-sensing capabilities were suggested by the temperature-dependent emission spectra, observed between 263 and 363 K. The blue I479/485 and IR I795/807 Tm3+ emissions were measured using the luminescent intensity ratio (LIR). As the temperature rises, the absolute and relative temperature sensitivity steadily drops, reaching values of 4.05x10-3 K-1 and 0.41 %K-1 for blue and 3.8x10-3 K-1 and 0.31 %K-1 for infrared at 300 K.Advanced Ceramics and Application : 13th Serbian Ceramic Society Conference : Program and the Book of Abstracts; September 8-10, 2025; Belgrade