In this study, the effects of Zr, Zn and Cu additions on the microstructure, room-temperature and high-temperature mechanical properties of an Mg-3Sn-1Ca alloy (from 25 °C to 250 °C) were studied. ...The results reveal that additions of Zr and Zn do not change the phase composition of the alloy, composed of CaMgSn and Mg2Sn phases. After the addition of Zn, the grains are significantly refined, the volume fraction of the second phase is increased and dispersed, and the Mg2Ca phase is precipitated. The grain refinement of Zr is better than that of Zn. After adding the Cu element, the Mg2Cu phase precipitates besides the CaMgSn phase. A comparison of mechanical properties shows that the alloy with Zr (TXK311) has the best mechanical properties at room temperature and high temperature, and the elongation of the TXK311 alloy can reach 68.3 % at 250 °C. The TXK311 alloy was comprehensively considered to find its optimum mechanical properties. The analysis shows that fine grains, a uniform phase distribution and texture play important roles in the deformation of the alloy.
In this study, we optimized the preparation of 100–160 nm monodispersed SiO2 nanoparticles and, through doping, investigated their effects on the physical properties of a water-based acrylic-amino ...varnish. First, using a non-fixed point feeding technique based on the half-batch sol-gel method, we enhanced the yield of small-sized monodispersed SiO2 nanoparticles. To reduce the cost of production and organic-matter pollution, we assessed certain solution parameters including tetraethyl orthosilicate (TEOS), ethanol (ETOH) and ammonia in a single-reaction system. We found that the gloss, clarity, hardness, adhesion, and other physical properties of the acrylic-amino varnish were successfully enhanced through an addition of 1.2 % SiO2 nanoparticles.
Different cooling rates, such as room temperature water cooling (WQ), furnace cooling (FC), and water cooling + furnace cooling (FC +WQ), were introduced to study the effect on the solution-treated ...Mg-9Gd-4Y-2Zn-0.5Zr (w/%) alloy microstructure and mechanical properties. The grain size decreases as the cooling rate increases. With the lengthening of the cooling process time, the LPSO phase had enough time to nucleate and diffuse, the LPSO (long-period stacking order) phase filled the whole matrix crystal grains at the same time. In the process of furnace cooling and water cooling, the brightness of the LPSO phase was different, so it could be seen that the cooling rate would affect the contrast and morphology of the LPSO phase. The tensile yield strengths of the samples cooled with the furnace were better than those of the water-cooled samples, but their ultimate tensile strength and elongation to failure were poor. The fracture modes of the samples under different cooling rates were all subject to cleavage fracture, and the number and area of the cleavage planes and cleavage steps increased with the decrease of cooling speed, and the tearing area decreased, resulting in poor ultimate tensile strength and stretchability.
To explore the effect of pulse duration on the micro-morphology and mechanical properties of laser-welded glass joints, a glass welding experiment was carried out. The microstructure of the molten ...layer with different pulse durations was shown by field-emission scanning electron microscopy. The pores and distribution characteristics were analyzed, and the porosity variation rule of the welding layer for different pulse durations was obtained. The line-scan analysis of the joint interface was carried out with a D8-Advance type crystal X-ray diffractometer, and the relationship between the thickness of the reactive wetting layer and the pulse duration was obtained. The hardness and welding strength of the laser-welded glass joints were obtained with a Vickers hardness tester and an electronic universal testing machine. This study can provide a theoretical and experimental basis for the laser welding of glass.
Sodišču pridružena mediacija se kot alternativna metoda reševanja sporov vse bolj uveljavlja kot področje dela z lastnim teoretičnim in praktičnim znanjem, lastnimi načeli in osnovnimi pravili. ...Mediacija je vzpostavila lastno znanje, ki temelji na študijah, razvrstitvi primerov in analizi rezultatov. V prispevku bomo preverili, ali lahko glede na razvoj mediacije v Sloveniji govorimo o poklicu mediatorja in ga opredelimo kot strokovnega nosilca postopka mediacije. Najprej bomo sodišču pridruženo mediacijo in mediatorje, ki mediirajo v sodišču pridruženi mediaciji, teoretsko opredeliti ter s pomočjo intervjujev s strokovnjaki za mediacijo in mediatorji v nadaljevanju preverili, kakšno je njihovo mnenje o mediatorjih in sodišču pridruženi mediaciji. Proučili bomo tudi pravno podlago sodišču pridružene mediacije tako v Sloveniji kot Evropski uniji. Glede na ugotovitve bomo sklenili, da je pravna ureditev sodišču pridružene mediacije v Sloveniji dobra in da lahko o mediatorjih sodišču pridružene mediacije govorimo kot o strokovnih nosilcih mediacijskega postopka.
Patient satisfaction is an important indicator of the quality of care provided. Evaluating women's satisfaction with childbirth is essential to improving obstetric care and ensuring a positive ...experience for mothers and newborns. The tools used to measure women's satisfaction with childbirth are very heterogeneous and multidimensional. Assessment tools used in practice should be tested and meet characteristics that are consistently validated.The aim is to identify currently available instruments measuring women's satisfaction with childbirth and to evaluate their structure, content and psychometric properties.
A systematic search for sources was carried out according to the criteria set. For the included studies, psychometric properties were assessed in accordance with the principles of the guideline for completing systematic reviews of patient-reported outcome measures, COSMIN.
The review included 31 studies that reported the psychometric properties of six measurement instruments (questionnaires, scales). Content validity, structural validity, internal consistency, reliability and cross-cultural validity were assessed for the included studies. The Childbirth Experience Questionnaire (CEQ/CEQ2) and Birth Satisfaction Scale - Revised (BSS-R) were the most commonly used questionnaires in the studies.
Thorough testing of tools measuring women's satisfaction with childbirth, and adapting them to cultural and social contexts, is still essential. It is crucial that valid and reliable questionnaires are available for midwives in practice, for use in research, to inform clinical practice and for the results to help develop the services offered.
This study enhances the strength of the Al6061 alloy by adding Ti in the form of a rod using a thermomechanical process, which would be useful in making structures for aerospace and structural ...members. Two different properties of the material are joined together to form a new bimetallic material. Softer Al-6061 is used as a sleeve, and grade-II Ti is used as a core. They were prepared with a co-extrusion process at a temperature of 400 °C with different ratios of 2:1 and 2:0.5. The prepared substrates are analysed for characterization, hardness, tensile strength, and corrosion. The development of the diffusion layer is observed at the boundary of the Al-Ti material, and the bonding is improved. Compared to an aluminium alloy and a 2:1 bimetal composite, the co-extruded Al-Ti with a ratio of 2:0.5 bimetal composite ratio shows a better microstructure, mechanical, and tribological properties. It is concluded that the co-extrusion of Ti and Al is an efficient way to devise new composites with mechanical properties of 14% and 19%, respectively.
Porous cobalt (Co) microspheres were successfully synthesized via a facile surfactant-free solvothermal route. These microspheres have an average diameter of about 2 µm, assembled by many primary Co ...nanosheets. A possible formation mechanism of porous Co microspheres is discussed. The magnetic hysteresis loop shows a ferromagnetic feature of porous Co microspheres and the saturation magnetization (Ms) and coercivity (Hc) are 115.3 J/T·kg and 6.883 kA/m, respectively.
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