Задачі заочної фізико-математичної школи

У посібнику на основі узагальнення досвіду роботи заочної фізико-математичної школи Кіровоградського державного педагогічного університету імені Володимира Винниченка подано методику й аналіз розв’язування основних типів завдань з математики й фізики. Він покликаний допомогти старшокласникам і абітурієнтам у стислі терміни систематизувати свої знання, удосконалити навички, застерегти від можливих помилок, а отже краще підготуватися до незалежного тестування з математики й фізики. Посібник буде корисним випускникам загальноосвітніх шкіл, а також учителям та студентам фізико-математичних факультетів педагогічних університетів

Interface characterization of Co2MnGe/Rh2CuSn Heusler multilayers

All-Heusler multilayer structures have been investigated by means of high kinetic x-ray photoelectron spectroscopy and x-ray magnetic circular dichroism, aiming to address the amount of disorder and interface diffusion induced by annealing of the multilayer structure. The studied multilayers consist of ferromagnetic Co$_2$MnGe and non-magnetic Rh$_2$CuSn layers with varying thicknesses. We find that diffusion begins already at comparably low temperatures between 200 $^{\circ}$C and 250 $^{\circ}$C, where Mn appears to be most prone to diffusion. We also find evidence for a 4 {\AA} thick magnetically dead layer that, together with the identified interlayer diffusion, are likely reasons for the small magnetoresistance found for current-perpendicular-to-plane giant magneto-resistance devices based on this all-Heusler system

2D to 3D crossover of the magnetic properties in ordered arrays of iron oxide nanocrystals

The magnetic 2D to 3D crossover behavior of well-ordered arrays of monodomain gamma-Fe2O3 spherical nanoparticles with different thicknesses has been investigated by magnetometry and Monte Carlo (MC) simulations. Using the structural information of the arrays obtained from grazing incidence small-angle X-ray scattering and scanning electron microscopy together with the experimentally determined values for the saturation magnetization and magnetic anisotropy of the nanoparticles, we show that MC simulations can reproduce the thickness-dependent magnetic behavior. The magnetic dipolar particle interactions induce a ferromagnetic coupling that increases in strength with decreasing thickness of the array. The 2D to 3D transition in the magnetic properties is mainly driven by a change in the orientation of the magnetic vortex states with increasing thickness, becoming more isotropic as the thickness of the array increases. Magnetic anisotropy prevents long-range ferromagnetic order from being established at low temperature and the nanoparticle magnetic moments instead freeze along directions defined by the distribution of easy magnetization directions

Båtshake

Rapporten behandlar det kandidatarbete som fem studenter blev tilldelade våren år 2014. Målet med arbetet innefattar utveckling och framtagning av en produkt som underlättar förtöjning av båtar vid exempelvis bojar och bryggor. Detta kandidatarbete resulterade i en produktdesign av en båtshake som underlättar förtöjning och denna uppfyller behov som har identifierats från en marknadsundersökning. Arbetet innefattar analyser av tillverkningsmetoder och material för att finna lämpliga sådana vid framtagning av produkten i fråga. Rapporten redogör även för hur koncept och design har tagits fram med hjälp av diverse konceptgenereringsmetoder. För att testa produktdesignen och dess funktioner tillverkades en prototyp likvärdig med den framtagna designen. Denna testades i sin arbetsmiljö, men även i en simulerad sådan. Därefter gjordes bedömningen att den uppfyller de mål och krav som har satts upp för projektet.The report discusses the bachelor’s thesis that five students were assigned in the spring of 2014. The goal of this thesis includes the development and production of a product that facilitates the mooring of boats, for example to buoys and piers. This paper covers the work process resulting in a product design of a boat hook that facilitates mooring. This product was designed to meet the customer needs identified during a market survey. The report analyzes the manufacturing methods and materials in order to find appropriate ones for the production of the designed product. The report describes how the concept and design was developed assisted by various concept generation methods. To test the product design and its features a prototype similar to the developed design was produced. This was tested in a realistic working environment, but also in a simulated one. The conclusion was that the prototype met the required customer needs that were put forth throughout the project

Båtshake

Rapporten behandlar det kandidatarbete som fem studenter blev tilldelade våren år 2014. Målet med arbetet innefattar utveckling och framtagning av en produkt som underlättar förtöjning av båtar vid exempelvis bojar och bryggor. Detta kandidatarbete resulterade i en produktdesign av en båtshake som underlättar förtöjning och denna uppfyller behov som har identifierats från en marknadsundersökning. Arbetet innefattar analyser av tillverkningsmetoder och material för att finna lämpliga sådana vid framtagning av produkten i fråga. Rapporten redogör även för hur koncept och design har tagits fram med hjälp av diverse konceptgenereringsmetoder. För att testa produktdesignen och dess funktioner tillverkades en prototyp likvärdig med den framtagna designen. Denna testades i sin arbetsmiljö, men även i en simulerad sådan. Därefter gjordes bedömningen att den uppfyller de mål och krav som har satts upp för projektet.The report discusses the bachelor’s thesis that five students were assigned in the spring of 2014. The goal of this thesis includes the development and production of a product that facilitates the mooring of boats, for example to buoys and piers. This paper covers the work process resulting in a product design of a boat hook that facilitates mooring. This product was designed to meet the customer needs identified during a market survey. The report analyzes the manufacturing methods and materials in order to find appropriate ones for the production of the designed product. The report describes how the concept and design was developed assisted by various concept generation methods. To test the product design and its features a prototype similar to the developed design was produced. This was tested in a realistic working environment, but also in a simulated one. The conclusion was that the prototype met the required customer needs that were put forth throughout the project

Insights into the Formation of DNA−Magnetic Nanoparticle Hybrid Structures : Correlations between Morphological Characterization and Output from Magnetic Biosensor Measurement

Understanding the binding mechanism between probe-functionalized magnetic nanoparticles (MNPs) and DNA targets or amplification products thereof is essential in the optimization of magnetic biosensors for the detection of DNA. Herein, the molecular interaction forming hybrid structures upon hybridization between DNA-functionalized magnetic nanoparticles, exhibiting Brownian relaxation, and rolling circle amplification products (DNA-coils) is investigated by the use of atomic force microscopy in a liquid environment and magnetic biosensors measuring the frequency-dependent magnetic response and the frequency-dependent modulation of light transmission. This approach reveals the qualitative and quantitative correlations between the morphological features of the hybrid structures with their magnetic response. The suppression of the high-frequency peak in the magnetic response and the appearance of a new peak at lower frequencies match the formation of larger sized assemblies upon increasing the concentration of DNA-coils. Furthermore, an increase of the DNA-coil concentration induces an increase in the number of MNPs per hybrid structure. This study provides new insights into the DNA-MNP binding mechanism, and its versatility is of considerable importance for the mechanistic characterization of other DNA-nanoparticle biosensor systems

Modelling and design of planar Hall effect bridge sensors for low-frequency applications

The applicability of miniaturized magnetic field sensors is being explored in several areas of magneticfield detection due to their integratability, low mass, and potentially low cost. In this respect, differentthin-film technologies, especially those employing magnetoresistance, show great potential, being compatible with batch micro- and nanofabrication techniques. For low-frequency magnetic field detection,sensors based on the planar Hall effect, especially planar Hall effect bridge (PHEB) sensors, show promising performance given their inherent low-field linearity, limited hysteresis and moderate noise figure. Inthis work, the applicability of such PHEB sensors to different areas is investigated. An analytical modelis constructed to estimate the performance of an arbitrary PHEB sensor geometry in terms of, e.g., sensitivity and detectivity. The model is valid for an ideal case, e.g., disregarding shape anisotropy effects, andalso incorporates some approximations. To validate the results, modelled data was compared to measurements on actual PHEBs and was found to predict the measured values within 13% for the investigatedgeometries. Subsequently, the model was used to establish a design process for optimizing a PHEB to aparticular set of requirements on the bandwidth, detectivity, compliance voltage and amplified signalto-noise ratio. By applying this design process, the size, sensitivity, resistance, bias current and powerconsumption of the PHEB can be estimated. The model indicates that PHEBs can be applicable to severaldifferent areas within science including satellite attitude determination and magnetic bead detection inlab-on-a-chip applications, where detectivities down towards 1 nT Hz−0.5at 1 Hz are required, andmaybeeven magnetic field measurements in scientific space missions and archaeological surveying, where thedetectivity has to be less than 100 pT Hz−0.5at 1 Hz

Емпіричне дослідження формування художньо-естетичної компетентності майбутніх учителів образотворчого мистецтва у процесі вивчення декоративно-прикладного мистецтва

У статті представлені результати емпіричного дослідження формування художньо-естетичної компетентності майбутніх учителів образотворчого мистецтва у процесі вивченні декоративно-ужиткового мистецтва. Визначено критерії та їх якісні характеристики