The effect of structural changes on magnetic permeability of amorphous powder Ni80Co20

The structural changes of Ni80Co20 amorphous powder were tested during heating. The alloy was obtained by electrolysis from ammonia solution sulfate of cobalt and nickel on the titanium cathode. The differential scanning calorimetry (DSC) method was used to detect that the crystallization process of powder occurred in two stages with crystallization peaks temperatures of the first stage at 690 K and of the second stage at 790 K. The effect of structural relaxation and crystallization of powder on magnetic properties was predicted by measurement of the relative magnetic permeability change in isothermal and nonisothermal conditions. On the basis of the time change of relative magnetic permeability at a defined temperature in the temperature range of the first and second crystallization peak on the thermogram, the kinetics of crystallization was defined. It was predicted, that in the initial time interval, in the range of the first crystallization peak, the rate of crystallization is determined by the rate of nucleation of the amorphous part of the powder. However, in the second time interval, the crystallization rate is determined by the rate of diffusion. In the range of the second peak, in the beginning the rate of crystal growth is determined by activation energy of the atom pass from smaller to bigger crystal grain. In second time interval, the rate of crystal grain growth is determined by the diffusion rate of atoms to the location of integration into bigger crystal grains. For all processes which determine the rate of crystallization in temperature ranges of both crystallization peaks, the Arrhenius temperature dependence of rate for those processes is obtained. The relative magnetic permeability of crystallized powder at 873 K, is smaller for about 30 % than the relative magnetic permeability of fresh powder at room temperature. However, structurally relaxed powder at 573 K has an about 22 % larger magnetic permeability than the same fresh powder at room temperature

Investigation of solidification behavior of the Sn-rich ternary Sn-Bi-Zn alloys

Solidification properties and microstructure of six as-cast Sn-Bi-Zn alloys with 80 at.% of Sn and variable contents of Bi and Zn were experimentally investigated using the scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS) and differential scanning calorimetry (DSC). The experimentally obtained results were compared with predicted phase equilibria according to the calculation of phase diagram (CALPHAD) method and by the Scheil solidification simulation.

Cerium oxide based nanometric powders: synthesis and characterization

Nanometric powders of solid solutions of cerium oxide were obtained by a modified glycine nitrate procedure. Solid solutions of the host compound CeO2 with one or more dopants in the lattice were synthesized. Rare earth cations (Re=Yb, Gd and Sm) were added to ceria in total concentration of x= 0.2 that was kept constant. The criterion in doping was to keep the value of lattice parameter of ceria unchanged. The lattice parameters were calculated by using the model that takes into account the existence of oxygen vacancies in the structure

A Multistage Stochastic Programming Approach to the Dynamic and Stochastic VRPTW - Extended version

We consider a dynamic vehicle routing problem with time windows and stochastic customers (DS-VRPTW), such that customers may request for services as vehicles have already started their tours. To solve this problem, the goal is to provide a decision rule for choosing, at each time step, the next action to perform in light of known requests and probabilistic knowledge on requests likelihood. We introduce a new decision rule, called Global Stochastic Assessment (GSA) rule for the DS-VRPTW, and we compare it with existing decision rules, such as MSA. In particular, we show that GSA fully integrates nonanticipativity constraints so that it leads to better decisions in our stochastic context. We describe a new heuristic approach for efficiently approximating our GSA rule. We introduce a new waiting strategy. Experiments on dynamic and stochastic benchmarks, which include instances of different degrees of dynamism, show that not only our approach is competitive with state-of-the-art methods, but also enables to compute meaningful offline solutions to fully dynamic problems where absolutely no a priori customer request is provided.Comment: Extended version of the same-name study submitted for publication in conference CPAIOR201

Askaridoza - stalno prisutan problem intenzivne svinjarske proizvodnje

Ascaridosis presence mast frequent, and most important, with global distribution with prevalence, dependent of bruding condition, were 5-95%. Chronical development of diseases induce permanent lasses at swine production through by low growth, weakly product results and by condemned of organs when presence larvar migration. At our parers we give outline on most important moment connected with swine askaridosis spread of parasites in our countries, pathogenesis and pathology changes and measure to prevention and eradication of diseases.Askaridoza predstavlja najčešću i najrasprostranjeniju parazitsku infekciju svinja, globalne distribucije, čija se prevalenca zavisno od uslova držanja kreće 5- 95%. Protičući u hroničnom obliku uzrokuje gubitke u svinjarskoj proizvodnji koji se manifestuju u vidu umanjenog prirasta, slabije konverzije hrane i odbacivanja organa kroz koje se odvija migratorna faza parazita. U našem radu dajemo kratak osvrt na najvažnije momente vezane za askaridozu svinja - raširenost ove parazitoze kod nas, patogenezu i patološke promene kao i mere preventive i suzbijanja oboljenja

Šuga - stalno prisutan problem intenzivne svinjarske proizvodnje

Scabies caused by Sarcoptes scabei var. suis presence most frequent, and most important health problem in farm breeding swine with global distribution with prevalence, dependent of bruding condition, were 5-95%. Chronical development of diseases induce permanent lasses at swine production through by low growth, weakly product results and by condemned of organs when presence larvar migration. At our papers we give outline on most important moment connected with swine scabies spread of parasites in our countries pathogenesis and pathology changes and measure to prevention and eradication of diseases.Šuga uzrokovana sa Sarcoptes scabei var. suis predstavlja jednu od najčešćih i najrasprostranjenijih parazitsku infekciju svinja, globalne distribucije čija se prevalenca zavisno od uslova držanja kreće 5-95%. Protičući u akutnom a potom hroničnom obliku uzrokuje rapidne gubitke svinjarskoj proizvodnji kroz umanjen prirast i slabije proizvodne rezultate. U našem radu dajemo kratak osvrt na najvažnije momente vezane za šugu svinja raširenost ove parazitoze kod nas, patogenezu i patološke promene kao i mere preventive i suzbijanja obolenja

Periodontal medicine: The emergence of a new branch in periodontology

Introduction: Periodontal medicine is the emergence of a new branch of periodontology. Periodontal medicine is a term used for different purposes in different parts of the world. In certain countries, it relates to the study of the dynamic relationship between periodontal diseases and systemic conditions, such as cardiovascular and cerebrovascular disease, preterm delivery low-birth-weight babies, diabetes mellitus, osteoporosis, and disorders of the respiratory tract. Such studies investigate the peripheral impacts of periodontal inflammation on systemic health. In other countries, 'periodontal medicine' is a term used to describe the periodontal (and gingival) manifestations of medical conditions. This includes their investigation, diagnosis and therapeutic management and how management of the oral condition integrates with the patient's medical management as part of a holistic approach within defined care pathways. Conclusion: The text is a comprehensive analysis of research on periodontal disease and its link to systemic conditions. The periodontal treatment may be important in terms of preventing a patient's overall health. Periodontologists emphasize that infections in the mouth can cause health problems in other parts of the body

Composite hydrogels obtained from extracts of Porphyridium purpureum and alginate

Hydrogels play a significant role in the food industry as three-dimensional polymer networks. Hydrogels have found extensive use not only in the production of traditional food products but also in designing carriers for bioactive components. Developing hydrogels for food applications prioritizes the use of natural ingredients and simple production methods. Extracts from the red microalgae Porphyridium purpureum contain sulphated polysaccharides and vibrantly coloured phycobiliproteins (PBPs), notably B-Phycoerythrin. This makes Porphyridium purpureum an excellent starting point for developing food-based hydrogels with strong bioactive properties. This work aims to develop and characterize the hydrogels from water extracts of Porphyridium purpureum. In order to achieve that, we used the gelling property of the extract under acidic conditions at pH 2.0. Two types of hydrogels based on this algal extract were compared. The first is formed solely in an acidic environment, while the second is formed by adding alginate at the same pH in the presence of calcium ions. The mechanical properties of both hydrogels were determined by frequency sweep measurements using a rheometer with applied plane/plane geometry. Rheological measurements showed that adding alginate significantly increases the mechanical properties and elasticity of the hydrogel. Confocal microscopy demonstrated stronger fluorescence of PBPs in the gel without alginate. Furthermore, the distribution of different PBPs within the gel network is more uniform without alginate. The digestibility of the hydrogels was evaluated using an in vitro static digestion model. Although both hydrogels were confirmed to be digestible, the hydrogel without adding alginate showed higher digestibility. Antioxidant assays, ABTS and a reducing power test showed that bioaccessible peptides after digestion of both hydrogels possess antioxidant activity, with those obtained without alginate having a higher activity. Overall, this research provides a simple and effective approach for developing coloured hydrogels with attractive appearance, good bioaccessibility and notable bioactive properties