BOOSTING STUDENTS’ MOTIVATION IN THE PROCESS OF STUDYING PRACTICAL COURSE OF THE GERMAN LANGUAGE DURING DISTANCE LEARNING

The article considers the question of boosting motivation of language specialty students during distance learning. The problem of increasing students’ motivation during distance learning is complex, completely unresolved and relevant. It is closely related to the questions of lesson organization and conducting, ways of intensifying students’ cognitive activities in the study group, the ability to provide constructive support and exchange views on different topics. The purpose of the given article is to check on the basis of the obtained practical results what means and methods can increase students’ motivation in the process of studying practical course of the German language. It is established that the crucial prerequisite for successful online learning is a conscious consideration of the motivational factor and the ability to manage it throughout the learning process. The effective factors of online lessons are indicated in the paper: well-selected and prepared material, teaching methods tested by experience and based on technical tools on various educational platforms, selected, structured and appropriately used content, forms and teaching aids. The means and methods of boosting students’ motivation in the process of studying Practical course of the German language are analyzed, considering the specific nature of this subject. It is established that the implementation of the conceptual ideas of education is carried out with the help of information technology, which is based on the fundamental didactic principles – activation, autonomy, constructiveness and a special role is paid to the whole study group. The functions and tasks of the tutor, his role in the formation of a sense of group unity in order to intensify students’ activities during distance learning are revealed. Recommendations for boosting students’ motivation in the process of online studying Practical course of the German language are developed.

Effect of treatment condition on perovskite film for perovskite solar cell application

In this study, the Perovskite material CH3NH3PbI3 was prepared using two-step sequential solution deposition technique. The treatment condition for Perovskite film including dipping duration, reaction temperature and annealing temperature was studied. Crystal structure, grain size, and purity of the prepared material were examined using XRD and SEM methods. The results indicate that controlling treatment condition has a significant effect on the crystallinity and purity of Perovskite film. Under suitable condition, the obtained Perovskite material has a tetragonal structure and grain size ranges from 200 to 400 nm. The Perovskite film was then applied as a light-harvesting material in Perovskite solar cell. The device exhibits a power conversion efficiency of 5.18% with JSC of 13.6 mA cm-2, VOC of 0.83 V, and fill factor of 45.9%.

School security management – ethical, psychosocial and institutional conditions

School security – of students, teachers, and other staff – is a critical issue in education policy. Due to the multiplicity of threats in the school environment, this issue still occupies a leading place in the discussion on education and forces constant care to improve this state. The headmaster manages school safety. The style of performing this duty is significant. The article discusses school security management, emphasizing the participatory method, which assumes the involvement of all educational entities in decision-making processes. Moreover, the prepared material presents many legal bases and other documents regulating safety rules and obligations to act in an emergency. Various educational programs and projects were also presented, which would be worth getting interested in to improve safety in schools.

Metal Oxide/Nitrogen-Doped Carbon Nanosheet Heteronanostructures as Highly Efficient Electromagnetic Wave Absorbing Materials

In this paper, we will discuss the excellent broadband microwave absorption behaviors of Cu/CuO/carbon nanosheet composites: traces of copper and oxide embedded in a carbon nano-sheet not only cut down the high permittivity of adsorbs but also induce more interfacial polarization centers. The results showed that at a cracking temperature of 900 °C, the fabricated material has a unique ripple-like structure, which promotes the hierarchical interfacial polarization. The prepared material has a maximum absorption bandwidth of 4.48 GHz at an exceedingly thin thickness of 1.7 mm and a maximum reflection loss of −25.3 dB at a thickness of 2 mm. It is a relatively ideal material for electromagnetic wave absorption.

Deposition Time induced Structural and Optical Properties of Lead Tin Sulphide Thin Films

Lead tin sulphide (Pb-Sn-S) thin films (TFs) were deposited on fluorine-doped tin oxide (FTO) substrates via the electrochemical deposition process using lead (II) nitrate [Pb(NO3)2], tin (II) chloride dehydrate [SnCl2.2H2O] and thiacetamide [C2H5NS] precursors as sources of lead (Pb), tin (Sn) and sulphur (S). The solution of all the compounds was harmonized with a stirrer (magnetic) at 300k. In this study, we reported on the improvements in the properties (structural and optical) of Pb-Sn-S TFs by varying the deposition time. We observed from X-ray diffractometer (XRD) that the prepared material is polycrystalline in nature. UV-Vis measurements were done for the optical characterizations and the band gap values were seen to be increasing from 1.52 to 1.54 eV with deposition time. In addition to this, the absorption coefficient and refractive index were also estimated and discussed.

Study of Influential Factors on the Dielectric Strength of [UPE/BaTiO3] Nanocomposites

Unsaturated polyester resin (UPE) was used as a base material and barium titanite nanoparticles (BaTiO3) (50-7-nm) as a support material, with different weight ratios (0.25,0.75,1.25,2 wt%), to prepare a nanocomposite material. The research models were prepared according to the standard specifications and with different thicknesses (≈ 1.1,1.8,2.2,2.7 mm) to show the effect of thickness, number of cycles, percentage of addition and voltage rise rate at (5 kv/s and 0.5 kv/s) on the dielectric strength (Ebr) of the prepared material. The results showed that Ebr decreased with increasing the thickness of the material, BaTiO3 additive rate and the number of cycles. Dielectric strength (Ebr) increases with increasing of voltage rise rate.

SYNTHESIS OF MIXED-METAL MIL(Ti-Fe) FROM VIETNAM ILMENITE ORE AND ITS APPLICATION FOR DEGRADATION OF DYE

In this work, the mixed-metal metal-organic frameworks MIL(Ti-Fe) were synthesized by the hydrothermal method. MIL(Ti-Fe) hybrid material was fabricated from ilmenite ore and 1,3,5-benzene tricarboxylic acid at a temperature of 130 oC for 24 hours. The prepared material was characterized by using scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared spectroscopy (IR), and Brunauer-Emmett-Teller (BET) surface area. The obtained MIL(Ti-Fe) particles have a diameter of from 0.2-1.0 µm with a BET surface area of 85.482 m2 g-1. The influence of various vital parameters such as pH of the dye solution, initial dye concentration, adsorption time, and amount of the catalyst on the dye removal efficiency was investigated. The photocatalytic degradation rate of Rhodamine B was found to be 0.0074 min-1 at pH 7. The maximum removal of Rhodamine B was obtained at the catalyst dose of 1.0 g L-1. Under simulated sunlight irradiation, the resultant mixed-metals MOFs showed high photodegradation toward Rhodamine with degradation efficiency of approximately 99,97% after 6 hours. Furthermore, the resultant materials also showed remarkable absorption behavior toward Rhodamine B with the adsorption capacity of 70 mg g-1.

Preparation of Zinc Oxide Nanomaterial and Research and Development of Antibacterial Property

Children using environmentally unfriendly furniture are more likely to suffer from allergic rhinitis, respiratory infections, and leukemia. The green design of children’s furniture must consider anti-formaldehyde, deodorant, antibacterial, and antiviral factors. This paper prepares a zinc oxide (ZnO) nanomaterial for children’s furniture, and researches and develops the antibacterial property of the nanomaterial. The main contents include the synthesis method and preparation process, material morphology and structure characterization, and antibacterial performance testing. The practical substrate modification of the material was realized by pre-depositing polydopamine particles. In this way, the ZnO nanomaterial could apply to a wider range of children’s furniture, become more durable, and realize efficient multi-mechanism synergistic sterilization. Experimental results show that the prepared material has a good antibacterial property.

EVALUATION OF TRIBOLOGICAL CHARACTERISTICS OF MATERIAL PREPARED BY DMLS TECHNOLOGY

The method of producing molten metal powder according to the European laser sintering system (EOSINT) was used to prepare the experimental material. The used powder metal material was designated EOS Maraging Steel - MS1. It is a steel powder, which is optimized especially for processing in EOSINT M 280 systems. The measurement of tribological characteristics of prepared materials was performed using the standard STN ISO 20808: 2004. The ball-on-disc dry sliding friction and wear experiments have been made on prepared materials in contact with steel ball. For the experiment, there were determined the following conditions: the value of normal load 5 N, the sliding radius 2 mm. Wear testing was carried out at room temperature 25°C using the ball-on-disc technique. Wear behaviour of the prepared material was studied in dry sliding; relative humidity was 26-28%. The normal load of 5 N; and sliding speed of 0.1 m/s was applied. The total sliding distance was 1000 m. The worn surface was analysed by confocal microscope and scanning electron microscope.

Adsorption of Cationic Dyes on a Magnetic 3D Spongin Scaffold with Nano-Sized Fe3O4 Cores

The renewable, proteinaceous, marine biopolymer spongin is yet the focus of modern research. The preparation of a magnetic three-dimensional (3D) spongin scaffold with nano-sized Fe3O4 cores is reported here for the first time. The formation of this magnetic spongin–Fe3O4 composite was characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTA) (TGA-DTA), vibrating sample magnetometer (VSM), Fourier-transform infrared spectroscopy (FTIR), and zeta potential analyses. Field emission scanning electron microscopy (FE-SEM) confirmed the formation of well-dispersed spherical nanoparticles tightly bound to the spongin scaffold. The magnetic spongin–Fe3O4 composite showed significant removal efficiency for two cationic dyes (i.e., crystal violet (CV) and methylene blue (MB)). Adsorption experiments revealed that the prepared material is a fast, high-capacity (77 mg/g), yet selective adsorbent for MB. This behavior was attributed to the creation of strong electrostatic interactions between the spongin–Fe3O4 and MB or CV, which was reflected by adsorption mechanism evaluations. The adsorption of MB and CV was found to be a function of pH, with maximum removal performance being observed over a wide pH range (pH = 5.5–11). In this work, we combined Fe3O4 nanoparticles and spongin scaffold properties into one unique composite, named magnetic spongin scaffold, in our attempt to create a sustainable absorbent for organic wastewater treatment. The appropriative mechanism of adsorption of the cationic dyes on a magnetic 3D spongin scaffold is proposed. Removal of organic dyes and other contaminants is essential to ensure healthy water and prevent various diseases. On the other hand, in many cases, dyes are used as models to demonstrate the adsorption properties of nanostructures. Due to the good absorption properties of magnetic spongin, it can be proposed as a green and uncomplicated adsorbent for the removal of different organic contaminants and, furthermore, as a carrier in drug delivery applications.