Papers by Keyword: Characteristics

Abstract: Peptones are protein hydrolysis products consisting of a mixture of free amino acids, oligopeptides, and other fragmented protein components easily digestible by microorganisms. This study aimed to investigate the effect of crude ficin enzyme on the characteristics of peptones derived from yellowfin tuna (Thunnus albacares) dark meat and their potential application in microbial growth. Crude ficin enzyme concentrations used to produce peptones from yellowfin tuna dark meat were 0%, 0.1%, 0.2%, 0.3%, and 0.4%. The results showed that using crude ficin enzyme impacted the characteristics of peptones from yellowfin tuna dark meat, including protein content, amino nitrogen, degree of hydrolysis, and optical density. The research findings revealed protein content of 16.20%-32.51%, amino nitrogen of 2.74%-6.53%, hydrolysis degree of 28.37%-39.16%, and optical density value of 0.342-0.574. The optimal concentration of crude ficin enzyme, based on the results obtained in this study, 0.2% crude ficin enzyme was used for producing peptone from yellowfin tuna (Thunnus albacares) dark meat. .

Abstract: Thermoelectric-based on Thermoelectric Generator (TEG) is a method of converting heat energy into electrical energy directly if there is a temperature difference (∆T) between the hot side temperature (Th) and the cold side temperature (Tc) of the TEG. Compared to conventional energy conversions such as steam turbines, this thermoelectric technology has no moving parts, is compact, quiet, highly reliable, environmentally friendly, and operated for long periods with minimal maintenance. This study aims to develop TEG technology as a means of converting heat energy from geothermal sources, especially those with medium and low temperatures (< 180 °C). The method used in this research is to conduct experiments to obtain the ideal TEG characteristics for use in medium and low temperature geothermal conditions. To achieve this goal, a characteristic test was conducted for five types of TEG with criteria including a maximum operating temperature of 200 °C. The parameters that measured in this experiment are temperature T, voltage V, current I and electric power P. Based on data, the results is TEG1-241-1.4-1.2 is the most optimal power that produce output power 6.5 Watt at 150 °C.

Abstract: In this paper, we will study the development and comparison of characteristics and thermal properties of original celadon glazes and celadon glazes developed by adding black rice husk ash, Using Mae Rim black clay in Chiang Mai Province as raw material for the original celadon glaze (CG), including clay in the rice paddies, Kha wood ash and mixed wood ash. The raw materials for the development of celadon glazes formula were 14BR, 15BR, 20BR, 21BR, 27BR and 28BR, respectively. Using a triangular phase diagram system, Mae Taeng clay (MT), Kha wood ash (KWA) and black rice husk ash (BR) were used in the ratios of 40, 50, 60 and 70 wt.%, and using the red clay from Doi Saket, Chiang Mai as a coloring agent. Subsequently, the raw materials are ground and mixed to form a coating. Coated onto Mae Rim black clay test specimens. and fire the test specimen at 1250 °C in a reducing atmosphere. After that, the characteristics of the glazes after firing were tested, including crack, melt, flow, color appearance, and chemical composition. Thermal properties tests include the coefficient of thermal expansion and thermal shock resistance in temperature. The results showed that by comparing the original formula celadon glazes (CG) with the celadon glazes formula developed by adding black rice husk ash. crazing were reduced when adding more black rice husk ash. All formulations were melted at 1250 °C due to their CaO content of 55.0, 47.6, 41.0, 51.0, 47.9, 47.7 and 43.0 % respectively. From the chemical composition analysis with XRF, celadon glazes after firing in all formulas did not see any flow due to the content of SiO₂ being 28.0, 28.8, 35.4, 26.7, 28.3, 27.9 and 31.1% respectively. The appearance of glazes after firing was more greenish-yellow when rice husk ash was added when using a color analyzer. Because the amount of Fe₂O₃ up to 4.6, 9.3, 10.4, 8.2, 9.1, 5.9 and 6.0% respectively from Mae Taeng clay and Doi Saket clay. The chemical composition of celadon glaze consists of CaO as the main component, followed by SiO₂ and Fe₂O₃. The important thing is the chemical composition of the glazes was not found with lead and cadmium. The thermal expansion coefficient of celadon glazes at 25-1250°C decreased when adding more black rice husk ash. Finally, the percentage of strength loss after thermal shock temperature change was CG ˃ 20BR ˃ 21BR ˃ 27BR ˃ 28BR ˃ 14BR ˃ 15BR, respectively, using the Celadon Pottery Community Standards Test. (MorChor. 245/2013).

Abstract: Foamed cellular concrete (FCC) is a type of lightweight concrete. Traditionally, it has been used for insulation and void filling. However, in the last years, the possibility of obtaining high strength FCC has motivated the study of its structural use. The novelty and uniqueness of this article is to provide a review of the most important aspect of FCC including component materials, design and mix elaboration, physical properties and mainly, its mechanical behaviour. Also, in order to achieve a global understanding of the material and its characteristics, advances regarding its physical properties are collected: density, porosity, thermal, acoustic and water insulation, durability, fire resistance and drying shrinkage. Then mechanical properties such as elastic modulus, compressive, tensile, bending and shear behaviour, are analysed. The literature review also aims to evaluate the influence of using inert and active mineral additions, fibers and chemical additives to improve its mechanical and physical properties. Based on the work done, research needs have been identified: there are no prediction models for stress-strain behaviour with complete curves for FCC in compression nor in traction, the performed numerical modelling is scarce, use and effect of chemical additives is a not far studied, long-term tests are scarce or nil, the evaluation of resistance in different aggressive environments has not been sufficiently evaluated.

Abstract: Metallurgical characteristics of iron ore agglomerates of various basicity (reducibility, strength after reduction (LTD_+6.3), temperatures of the beginning and ending of softening) have been investigated. The phase composition (XRD) of iron ore agglomerates and their microstructure were analyzed by optical microscopy. Various dependences of influence of the basicity of iron ore agglomerates on their metallurgical characteristics with respect to the proportion of phase components that have been obtained. It has been shown that an increase in the proportion of stabilized silicoferrite (SFCA) in the agglomerate has a positive effect on their strength after reaction, which will further increase the productivity of the blast furnace and significantly reduce dust emission.

Abstract: A new composite material based on fish gelatin (FG) was obtained by graft copolymerization of methylmethacrylate (MMA) onto fish gelatin. The process was initiated by radicals formed by the RbTe_1.5W_0.5O₆ photocatalyst under visible light (λ=400-700 nm) irradiation at room temperature. The characteristics of the new polymer material were obtained by the methods of elemental and physico-chemical analyses.

Abstract: The 1.4301 stainless steel is part of the category of austenitic stainless steels, steels which do no undergo heat treatments in general, as they are intended for hot plastic deformation in particular. The aim of the research presented in this paper was to obtain significantly improved characteristics of the resistance properties in relation to the values obtained under classical conditions, by applying heat treatments. Samples taken from the delivery state material underwent annealing, quenching and ageing heat treatments. Subsequently, the samples thus treated were subjected to tests enabling the determination of the correlations between the heat treatment parameters, the structure and the properties.

Abstract: The metallurgical characteristics of pellets (reducibility, strength after reaction, softening start and end temperatures), phase composition (X-ray phase analysis), and porosity were studied. Blast furnace smelting parameters were calculated using laboratory pellets with different basicities and degrees of metallization. Pellets were obtained from complex titanium-magnetite ores. The vanadium extraction of this ore into metal did not exceed 10 % during smelting of metallized pellets in an arc steelmaking furnace, but special techniques could raise this to 85 %. According to calculations from the Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences (IMET UB RAS), vanadium extraction up to 80–90 % can be achieved by using high-base and partially metallized pellets. The influence of changes in the composition and metallurgical characteristics of titanomagnetite pellets with increasing basicity (especially relative to strength after reduction) should be taken into account.

Abstract: The current state of the cosmetology industry in the field of eyelash extension services is analyzed. It is concluded that the popularity of this type of service, despite the negative impact on eye health, will grow in the near future. The main symptoms that occur when using this procedure are analyzed. Among the most common symptoms should be noted a feeling of heaviness of the eyelids, burning, discomfort associated with a decrease in the field of view. It is noted that despite a number of works in this area to date, there is insufficient research, both from the point of view of the analysis of clinical cases, and from the point of view of developing safer adhesive compositions. An analysis is made of the characteristics of adhesives used in domestic cosmetology rooms. At the same time, attention was paid to the following: country of production, composition, texture and texture, setting speed, wearing time, shelf life, recommended temperature and humidity level. A typical composition of glue for eyelash extension contains the following components: cyanoacrylate and its derivatives (± 90 %); polymethylmethacrylate (PMMA) (± 6 %); black pigment - carbon black (± 4 %).

Abstract: The effect of lithium Oxide content on the characteristics and mechanical property of willemite (2ZnO.SiO₂) under a heating condition in Na₂O-K₂O-Li₂O-CaO-(ZnO)-Al₂O₃-SiO₂ glazing system used in stoneware, sintered at a maximum at temperature 1250 °C by a heating rate of 2.6 °C/min for 8 hours is the firing process of the glazes and clay to melt. After 15 minutes, the temperature dropped to 1100 °C for 40 minutes was stimulated crystallization and soaked in kiln at 1100 °C for 4 hours. This result was consistent with the chemical compositions from the XRF technique indicated that the glaze comprised ZnO and SiO₂ were the main compositions and compared to the mineral composition after sintering of the glazed crystal which revealed 2ZnO.SiO₂ as the main component and the result from the XRD technique. The microstructure of the glazed crystals after sintering was needle shaped and had spherical growth. The analytical results from Vickers hardness technique showed that microhardness by adding 3-5 % of Li₂O of the glazes S1, S2, S3, S4 and S5 as 105.96 ± 4.58, 112.30 ± 9.95, 153.90 ± 7.29, 244.80 ± 5.42 and 382.62 ± 9.20, respectively. More willemite crystals in the glaze results in more strength of the glaze as well.