Pyrophyllite modified carbon-based electrode

The main goal is to develop electrode material for the detection of traces of pesticides in food and water in a wide range of pH values. The leading idea is to use natural clay pyrophyllite to modify carbon paste electrode. SPEX Mixer/Mill 5100 is used for mechanochemical modification. The changes in the structure of pyrophyllite before and after the grinding process were studied by means of PSD, XRD, FTIR, and DTA-TG [1]. The electrochemical behavior of the sensor was followed using differential pulse stripping voltammetry (DPSV). It is shown that obtained material can be used as electrodes in electrochemical sensors for pesticide detection in a wide range of pH.Solid-State Science & Research Meeting : June 28-30, Zagreb, 2023

Evaluation of Watson-like Integrals for Hyper bcc Antiferromagnetic Lattice

Watson-like integrals for a d-dimensional bcc antiferromagnetic lattice I_d(\eta) and J_d(\eta) and another two similar integrals are evaluated in an exact way in terms of generalized hypergeometric functions. A simple formula connecting Id and Jd+1 is given along with the differential equations for I_d(\eta) and J_d(\eta). An application of I_d and J_d in the theory of the Heisenberg antiferromagnet is discussed, together with possible generalizations to non-integer values of d. Corresponding integrals for sc lattices are also briefly reviewed.Comment: 13 pages, 2 figures, Accepted for publication in Journal of Physics A: Mathematical & Theoretical 201

Virtual public participation during the Covid-19 crises Hype or new normal for city planning?

City and Regional planning should be accompanied by a thorough understanding of the contemporary social dynamics of the place and the implications it has for the people and other species who inhabit and use these places. As a result, territorial planning has been increasingly linked to participatory planning approaches in most politically and fiscally decentralised countries, to create sustainable living spaces through a bottom-up approach. Participatory planning again aiming to translate global solutions locally, giving local accents. The recent Covid19 health and related economic crises brought even more complexity to the planning table, emphasising the need for supplementary stakeholder and public participation using virtual platforms. Thanks to the pandemic crisis, planners across the globe are increasingly engaged with virtual participatory approaches, some with more success than others, due to various social, economic and cultural reasons. In an attempt to contextualise the challenges and opportunities of virtual participatory planning, this paper captures reflections of purposefully selected professional planners, all members of the International Society of City and Regional Planners (ISOCARP), who indicated an affinity with participatory planning approaches and the challenges and opportunities that the virtual platform provides. Specific focus was placed on a) challenges of virtual planning and b) opportunities of virtual participation - to draw conclusions on whether virtual participatory planning is only a hype, or would become the new normal for city and regional planning.Editors: Piotr Lorens and Hangwelani Hope Magidimish

Search for Dark Matter with CRESST

The search for direct interactions of dark matter particles remains one of the most pressing challenges of contemporary experimental physics. A variety of different approaches is required to probe the available parameter space and to meet the technological challenges. Here, we review the experimental efforts towards the detection of direct dark matter interactions using scintillating crystals at cryogenic temperatures. We outline the ideas behind these detectors and describe the principles of their operation. Recent developments are summarized and various results from the search for rare processes are presented. In the search for direct dark matter interactions, the CRESST-II experiment delivers competitive limits, with a sensitivity below 5x10^(-7) pb on the coherent WIMP-nucleon cross section.Comment: Accepted for publication in New Journal of Physics. 25 pages, 18 figure

A Knowledge Base For Teachers on Teacher-Student Relationships

Teacher-student relationships are an important factor in effective learning environments and of specific importance in multicultural classrooms. This chapter presents some of the findings of a research programme that studied for more than 30 years teacher-student relationships. We first summarise the interpersonal perspective on the study of teaching and introduce an instrument to measure perceptions of the teacher-student relationship. Then we present results on the associations of teacher-student relationships and student outcomes, both cognitive and affective and explore how these associations differ for various ethnic groups. After a discussion on changes in the teacher-student relationships in time and developments over the teaching career we discuss common teacher problems in the relationships with their classes with a comparison of problems in mainstream and multicultural classrooms. Finally we delve into teacher-student interact ions that can be considered building blocks for the development of teacher-student relationships with an emphasis on the influence of coercive teacher behaviour in one lesson on teacher-student relationships in consecutive lessons

Electrical and microstructural properties of Yb-doped CeO2

Nanopowdered Ce1−xYbxO2−δ solid solutions (0 ≤ x ≤ 0.2) were synthesized by a self-propagating room temperature synthesis. XRD and SEM were used to study the properties of these materials as well as the Yb solubility in CeO2 lattice. Results showed that all the obtained powders were solid solutions with a fluorite-type crystal structure and with nanometric particle size. The average size of Ce1−xYbxO2−δ particles was approximately 3 nm. Electrochemical impedance spectroscopy for the sintered pellets depicted that it was possible to separate Rbulk and Rgb in the temperature interval of 550–800 °C. The activation energy for the bulk conduction was 1.03 eV and for grain boundary conduction was 1.14 eV. Grain boundary resistivity dominates over the other resistivities. These measurements confirmed that Yb3+-doped CeO2 material had a potential as electrolyte for intermediate-temperature solid oxide fuel cell applications

AFM Surface Roughness and Topography Analysis of Lithium Disilicate Glass Ceramic

The aim of this study is presenting AFM analysis of surface roughness of Lithium disilicate glass ceramic (IPS e.max CAD) under different finishing procedure (techniques): polishing, glazing and grinding. Lithium disilicate glass ceramics is all-ceramic dental system which is characterized by high aesthetic quality and it can be freely said that properties of material provide all prosthetic requirements: function, biocompatibility and aesthetic. Experimental tests of surface roughness were investigated on 4 samples with dimensions: 18 mm length, 14 mm width and 12 mm height. Contact surfaces of three samples were treated with different finishing procedure (polishing, glazing and grinding), and the contact surface of the raw material is investigated as a fourth sample. Experimental measurements were done using the Atomic Force Microscopy (AFM) of NT-MDT manufacturers, in the contact mode. All obtained results of different prepared samples are presented in the form of specific roughness parameters (Rа, Rz, Rmax, Rq) and 3D surface topography