Результати експерименту щодо формування художньо-виконавських цінностей підлітків

The article highlights the developed methodology of the experiment on the formation of teenagers’ artistic-performing values in the process of learning singing. Development of the author’s methodology was carried out according to such guidelines as formation of a positive motivational sphere in order to activate interest in musical phenomena; awareness of artistic knowledge, mastery of expressive means of musical art; formation of knowledge, abilities and skills in the process of learning singing with the aim of developing teenagers’ artistic- performing values. During the research work, the most important tasks in the context of the molding experiment were singled out, namely: emergence of interest and formation of teenagers’ desire to get new musical impressions; formation of desire to learn musical material; activation of the need of students-teenagers in mastering musical-singing activities; acquiring knowledge about musical-choral repertoire; development of singing abilities and skills; achieving of performing results during musical-singing activities. Implementation of the experimental methodology was carried out sequentially during the expository-stimulating, information-evaluative and performing-creative stages.Key words: artistic-performing values, teenagers, experimental methodology, results of the experiment.У статті висвітлено розроблену методику експерименту щодо формування художньо-виконавських цінностей підлітків у процесі співацького навчання. Розробка авторської методики здійснювалася за такими орієнтирами, як формування позитивної мотиваційної сфери задля активізації інтересу до музичних явищ; усвідомлення мистецьких знань, опанування виразних засобів музичного мистецтва; формування знань, умінь і навичок у процесі співацького навчання з метою розвитку художньо-виконавських цінностей підлітків. Під час дослідницької роботи було виокремлено найбільш вагомі завдання в контексті формувального експерименту, а саме: виникнення інтересу й формування прагнення підлітків до усвідомлення нових музичних вражень; формування бажання засвоювати музичний матеріал; активізація потреби учнів-підлітків у засвоєнні музично-співацької діяльності; набуття знаннєвого досвіду щодо вокально-хорового репертуару; розвиток співацьких умінь і навичок; формування виконавського результату під час музично-співацької діяльності. Упровадження експериментальної методики було здійснено послідовно під час експонувально-спонукального, інформаційно-оцінювального та виконавсько-творчого етапів.Ключові слова: художньо-виконавські цінності, підлітки, експериментальна методика, результати експерименту

Phase-locking matter-wave interferometer of vortex states

Matter-wave interferometer of ultracold atoms with different linear momenta has been extensively studied in theory and experiment. The vortex matter-wave interferometer with different angular momenta is applicable as a quantum sensor for measuring the rotation, interatomic interaction, geometric phase, etc. Here we report the first experimental realization of a vortex matter-wave interferometer by coherently transferring the optical angular momentum to an ultracold Bose condensate. After producing a lossless interferometer with atoms only populating the two spin states, we demonstrate that the phase difference between the interferences in the two spin states is locked on $\pi$. We also demonstrate the robustness of this out-of-phase relation, which is independent of the angular-momentum difference between the two interfering vortex states, constituent of Raman optical fields and expansion of the condensate. The experimental results agree well with the calculation from the unitary evolution of wave packet in quantum mechanics. This work opens a new way to build a quantum sensor and measure the atomic correlation in quantum gases.Comment: 5 figure

Expansion dynamics of a spherical Bose-Einstein condensate

We experimentally and theoretically observe the expansion behaviors of a spherical Bose-Einstein condensate. A rubidium condensate is produced in an isotropic optical dipole trap with an asphericity of 0.037. We measure the variation of the condensate size during the expansion process. The free expansion of the condensate is isotropic, which is different from that of the condensate usually produced in the anisotropic trap. The expansion in the short time is speeding and then after a long time the expansion velocity asymptotically approaches a constant value. We derive an analytic solution of the expansion behavior based on the spherical symmetry, allowing a quantitative comparison with the experimental measurement. The interaction energy of the condensate is gradually converted into the kinetic energy at the beginning of the expansion and the kinetic energy dominates after a long-time expansion. We obtain the interaction energy of the condensate in the trap by probing the expansion velocity, which is consistent with the theoretical prediction.Comment: 6 pages, 5 figure

Geometrical and FEA study on Millipede Forming

Millipede Forming is an innovative sheet metal forming approach that has been proposed and developed in Australia. U-channels, Z-channels or tubular products can be made by Millipede Forming. While a strip moves through an optimal transitional surface between the entry to exit of a forming stand, the redundant longitudinal membrane strain can be significantly reduced compared to the conventional roll forming, which is the essential principle to obtaining high quality products. The incremental forming process studied has demonstrated major advantages on space efficiency, power consumption and materials sensitivities. The purpose of this study is to investigate the effects of main geometrical parameters and their optimization, in order to minimize the redundant longitudinal strains into elastic to avoid the redundant plastic deformations at flange during forming. In this study, a mild-steel U-channel sample with 10 mm flange width, fabricated by Millipede Forming in a forming length of 200 mm has been studied. Theoretical longitudinal membrane strains at profile\u27s edge of different transitional surfaces and downhill pass are also analyzed. The results showed that obtaining an optimal transitional surface is essential and necessary in controlling the peak longitudinal strain to an acceptable amount and that by increasing downhill pass, longitudinal strain can be significantly reduced. The optimized transitional surface and downhill pass flow were simulated by Abaqus, and the peak longitudinal strain was finally less than 0.2% through a very short forming length of 200 mm. The results prove that Millipede Forming can achieve a better product quality in a much shorter forming distance than conventional roll forming

Single catalyst double outer-sphere alkene cross-coupling

Cross-coupling catalysts typically react and unite functionally distinct partners via sequential inner-sphere elementary steps: coordination, migratory insertion, reductive elimination, etc. Here we report a single catalyst that cross-couples styrenes and benzyl bromides via iterative outer-sphere steps: metal-ligand-carbon interactions. Each partner forms a stabilized radical in-termediate yet hetero-coupled products predominate. The system is redox neutral and thus avoids exogenous oxidant, resulting in simple and scalable conditions. Numerous variations of alkene hydrobenzylation are made possible, including access to the privileged hetero-dibenzyl (1,2-diarylethane) motif and challenging quaternary carbon variants