Mechanism of a Solid-State Formation of La1-xSrxMnO3+δ (0 \u3c x \u3c 0.5) and Magnetic Characterization Thereof

Rich diversity of potential, substantially different micro-structural arrangements - reflecting on the wide potential set of interesting properties, ranging from high electrical conductivity to giant, collossal and/or low-field magnetoresistance to low Curie point - of LaSr-manganite materials opens possibilities for numerous scientific investigations oriented towards revealing correlations on the influence line: procedure of synthesis → inherent properties → measured properties → application of the material. The investigations of the influence of synthesis procedures and LaSr-manganite stoichiometries on the Curie point (and other magnetic characteristics) of the material, being the topic of this work, are attractive since they present a necessary primal step in the development of nano-magnetic drug carriers based on these materials. In the course of such an investigation, the mechanism of the formation of the desired manganite compounds by following a classical solid-state preparation method, was also studied

The Characterization of Nanosized Nickel-Zinc Ferrites Synthesized within Reverse Micelles of CTAB/1-Hexanol/Water Microemulsion

Stoichiometric nanocrystalline nickel–zinc ferrites were synthesized by a reverse micelle method following a multi-microemulsion approach. Different pH values were chosen for the alkali precipitating reaction during the synthesis of different powders. Synthesized, as-dried and subsequently calcined powders were characterized in terms of their magnetic properties. XRD analyses and specific-surface area measurements were used to determine the average particle sizes of the synthesized samples. DCS and TGA measurements were performed to reveal the phase transitions within the samples at elevated temperatures, whereas TEM was used to view and record the microstructure of the nanosized ferrite samples. A possible mechanism of the formation of the synthesized NiZn-ferrite was also discussed

Synthesis of Lanthanum-Strontium Magnanites by a Hydroxide-Precursor Co-Precipitation Method in Solution and in Reverse Micellar Microemulsion

Nanostructured lanthanum-strontium manganites have been synthesized using two different co-precipitation approaches, one in bulk solution, and the other in reverse micelles of CTAB/1-hexanol/1-butanol/water microemulsion. In both cases, precursor cations were precipitated by alkali precipitating agents. The properties of the material synthesized by using these two methods were compared in order to reveal potential advantages of microemulsion-assisted approach. The influence of the annealing conditions on the properties of synthesized manganites was investigated by using X-ray diffraction, transmission electron microscopy, differential thermal analysis, thermogravimetric analysis and magnetic measurements

Preparation of Silica-Coated Lanthanum-Strontium Manganite Particles with Designable Curie Point, for Application in Hyperthermia Treatments

Silica-coated lanthanum–strontium manganite particles with La0.76Sr0.24MnO3+δ stoichiometric formula, exhibiting Curie temperature at ∼40°C, were prepared by using a traditional solid-state method of synthesis of magnetic ceramic particles, followed by milling and a low-temperature coating procedure in an aqueous alcoholic alkali medium. The properties of the obtained material establish it as a potential candidate for self-regulated power-absorbing and temperature-controlling materials in hyperthermia treatments. Moreover, core-comprising LaSr–manganites with different stoichiometries, ranging from La0.5Sr0.5MnO3+δ to LaMnO3+δ, were synthesized, with magnetic and structural properties examined thereof. Herein reported findings can potentially be used in the preparation of silica-coated magnetic particles with designable Curie temperature, offering a wide range of possibilities of adapting the material to practical instrumental setups in drug delivery and hyperthermia treatments

Only Hope remains in the PANDORA\u27s .jar - Pervasive use of planning in a training environment

This paper shortly introduces features of a software system called PANDORA-BOX. It shows a novel use of timeline-based planning as the core element in a dynamic training environment for crisis managers. A trainer is provided with a combination of planning and execution functionalities that allow him to maintain and adapt a "lesson plan" as the basis for the interaction between him and the involved trainees. The training session is based on the concept of Scenario, a set of events and connected possibilities that shape an abstract plan proposed to trainees through a timeline-based system. The PANDORA architecture provides a continuous reactive loop around trainees, and, additionally allows the trainer to directly intervene in the ongoing session giving him a complete, general and advanced view about the evolution of the Scenario

Algorithm for finding low autocorrelation binary sequences

V diplomskem delu predstavljamo algoritem za iskanje binarnih sekvenc z nizko avtokorelacijo. S tem algoritmom najdemo binarne sekvence najnižjih dokumentiranih avtokorelacijskih nivojev. Omenjeni algoritem se ponuja z učinkovitim delovanjem in enostavno implementacijo. Skozi diplomsko delo opišemo idejo, kakšna je strategija pristopa in zakaj, predpogoje ter delovanje. Predstavimo lastna opažanja in ugotovitve, do katerih smo prišli med razvojem in raziskovanjem ter prikažemo dobljene rezultate.In this thesis, we present an algorithm for finding low autocorrelation binary sequences. This algorithm is able to find sequences with the lowest documented autocorrelation levels. The mentioned algorithm promises efficiency and simple implementation. Through this thesis, we present the idea behind the design, the approach strategy and why it is used, the prerequisites, and how the algorithm functions. We present newly acquired knowledge and findings reached through the development and research with the results

A collection of micrographs: where science and art meet

Micrographs obtained using different instrumental techniques are presented with the purpose of demonstrating their artistic qualities. The quality of uniformity currently dominates the aesthetic assessment in scientific practice and is discussed in relation to the classical appreciation of the interplay between symmetry and asymmetry in arts. It is argued that scientific and artistic qualities have converged and inspired each other throughout millennia. With scientific discoveries and inventions enriching the world of communication, broadening the space for artistic creativity and making artistic products more accessible than ever, science inevitably influences artistic creativity. On the other hand, the importance of aesthetic principles in guiding scientific conduct has been appreciated by some of the most creative scientific minds. Science and arts can be thus considered as parallel rails of a single railroad track. Only when precisely coordinated is the passing of the train of human knowledge enabled. The presented micrographs, occupying the central part of this discourse, are displayed with the purpose of showing the rich aesthetic character of even the most ordinary scientific images. The inherent aesthetic nature of scientific imagery and the artistic nature of scientific conduct have thus been offered as the conclusion

Synthesis of Lanthanum-Strontium Manganites by Oxalate-Precursor Co-Precipitation Methods in Solution and in Reverse Micellar Microemulsion

Nanostructured lanthanum–strontium manganites were synthesized using two different co-precipitation approaches, one in bulk solution, and the other in reverse micelles of CTAB/1-hexanol/water microemulsion. In both cases, precursor cations were precipitated by using oxalic acid. The properties of the materials synthesized by using these two methods were compared in order to reveal potential advantages of the microemulsion-assisted approach. The influence of the annealing conditions on the properties of synthesized manganites was investigated by using X-ray diffraction, transmission electron microscopy, differential thermal analysis, thermogravimetric analysis and magnetic measurements

Four Novel Co-Precipitation Procedures for the Synthesis of Lanthanum-Strontium Manganites

Lanthanum-strontium manganites were synthesized using co-precipitation method with a reverse micellar microemulsion. Either oxalic acid, sodium hydroxide or tetramethylammonium hydroxide was used for the precipitation of precursor cations in a form that was subsequently calcined under various conditions in order to obtain perovskite manganite phase. Correlations between the properties of the synthesized powder and the calcination conditions have been put forth. The properties of the microemulsion-assisted synthesized material were compared with the samples prepared by following the supposedly similar chemical recombinations in bulk solutions, with an aim to challenge the fact that microemulsions in general have only templating effects on the morphology of co-precipitated powder. TEM measurements, X-ray diffraction analyses and magnetic measurements were used in order to gain an insight into the mentioned difference, which is an important one for the future understanding of the role that reverse micelles play in the processes of materials synthesis