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1
Samatovich, Ergashev Jamoliddin, Nazarova Matluba Abdurashid Qizi, and Abduraufova Saodatjon Kodirjon Kizi. "Research Of Physical And Mechanical Indicators Of Jensie And Knitted Fabrics Recommended For Children's Combined Outerwear." American Journal of Interdisciplinary Innovations and Research 03, no. 03 (March 30, 2021): 37–44. http://dx.doi.org/10.37547/tajiir/volume03issue03-06.
Повний текст джерелаАнотація:
The article examines and analyzes the physical and mechanical properties of different proportions of jeans and knitted fabrics recommended for children's combined outerwear. It also offers the most alternative fabric patterns for children's outerwear.
2
Imhoff, Silvia, Alvaro Pires da Silva, Pablo J. Ghiberto, Cássio A. Tormena, Miguel A. Pilatti, and Paulo L. Libardi. "Physical Quality Indicators and Mechanical Behavior of Agricultural Soils of Argentina." PLOS ONE 11, no. 4 (April 21, 2016): e0153827. http://dx.doi.org/10.1371/journal.pone.0153827.
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3
Allahverdiyeva, Kh V. "PHYSICAL-MECHANICAL PROPERTIES OF NANOCOMPOSITES BASED ON GRAPHITE AND MODIFIED POLYOLEFINS." Chemical Problems 19, no. 4 (2021): 232–40. http://dx.doi.org/10.32737/2221-8688-2021-4-232-240.
Повний текст джерелаАнотація:
The influence of the graphite concentration on the main physical-mechanical properties of nanocomposites based on such polyolefin as high density polyethylene, low density polyethylene and polypropylene is considered. Properties such as tensile yield stress, ultimate tensile stress, and ultimate bending strength, elongation at break, heat resistance, flexural strength, MFI, and melting points are analysed. To improve the compatibility of the mixed components of the mixture, we used an Exxelor PO1040 compatibilizer for all grades of polyethylene and Exxelor PO1020 for polypropylene. Graphite was introduced into the composition of polyolefin at the following concentrations: 1.0, 3.0, 5.0, 10, 15, 20, and 30 wt%. As a result of the research, it was found that the introduction of graphite into the composition of polyolefin was accompanied by an improvement in strength characteristics with maximum at various concentrations. For high density polyethylene, the maximum values of strength characteristics are observed at 3.0 wt%, for low density polyethylene at 10 wt%, and for polypropylene at 5.0 wt% content of graphite. It revealed that such a difference in the value of the threshold concentration of graphite which provides the maximum value of strength indicators,was directly related to the degree of crystallinity of the polymer matrix.
4
Nunes, Luís Alfredo Pinheiro Leal, Bruno Karvand Ferreira Soares, Ricardo Silva de Sousa, Thiago Vinícius Barros Ibiapina, and Leovânio Rodrigues Barbosa. "Physical indicators after mechanical scarification in a Yellow Oxisol under no-tillage." Científica 48, no. 4 (December 22, 2020): 396. http://dx.doi.org/10.15361/1984-5529.2020v48n4p396-402.
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Gajic, Grozdana, Nikola Zivanovic, and Luka Vukic. "Indicators and degradation mechanisam of loess soil." Bulletin of the Faculty of Forestry, no. 114 (2016): 45–54. http://dx.doi.org/10.2298/gsf1614045g.
Повний текст джерелаАнотація:
Studies that are presented in this paper were carried out to define the formation criteria of loess soil degradation. Erosion stability analysis of this soil type will be carried out on the basis of its physical and mechanical characteristics. To describe the established relationships between the individual parameters of loess soil, the study uses mathematical model, that is based on experimentally obtained results of soils? physical and mechanical characteristics, From the presented results of geotechnical tests, mathematical models and functional relations between water regime and loess soils? resistant characteristics; indicators of internal erosion were defined as well as the mechanism of this process. Effects of the practical application of found results are also analyzed in this paper.
6
Brunerová, Anna, Miroslav Müller, Gürkan Alp Kağan Gürdil, Vladimír Šleger, and Milan Brožek. "Analysis of the physical-mechanical properties of a pelleted chicken litter organic fertiliser." Research in Agricultural Engineering 66, No. 4 (December 30, 2020): 131–39. http://dx.doi.org/10.17221/41/2020-rae.
Повний текст джерелаАнотація:
Pelleted fertiliser production represents improvements in fertiliser management and ensures several benefits, such as a more accurate dosing (less applications), the slow-release of long-lasting nutrients, the possible application during the whole year, easier storage and transportation and better separation of fertilisers and pesticides. The present research investigated the physical-mechanical properties of a pelleted chicken litter organic fertiliser. The pellet samples' particle density ρ (kg·m<sup>–3</sup>), mechanical durability DU (%), compressive strengths in the cleft σc (N·mm<sup>–1</sup>) and in simple pressure σp (MPa) were investigated. The last two indicators, σc and σp, demonstrated the pellets' resistance to the compressive stress. The resulting values proved ρ = 1 289.73 kg·m<sup>–3</sup>, DU = 95.5%, σc = 58.61 N·mm<sup>–1</sup> and σp = 20.02 MPa, while all the results were evaluated positively. The observed level of the DU (%) did not achieve the mandatory level for the commercial production of pellets (DU = 97.5%), however, such a level is stated for a pellet solid biofuel intended for energy production. Therefore, the achieved level of the DU (%) represents a satisfactory result within the investigated pellet samples' mechanical quality. In general, the viability and practicability of chicken litter pellet production was proven, as well as, the suitability of such a feedstock for pellet production. Moreover, the observed results proved a high level of the investigated pellet samples' mechanical quality.
7
Belikov, O. I., and N. N. Sorokhan. "Characteristics of the Physical and Mechanical Properties of Self-Etching Self-Adhesive Cements for Indirect Restorations in a Comparative Aspect." Ukraïnsʹkij žurnal medicini, bìologìï ta sportu 7, no. 1 (March 22, 2022): 203–7. http://dx.doi.org/10.26693/jmbs07.01.203.
Повний текст джерелаАнотація:
The purpose of the study was to carry out a comparative analysis of self-etching self-adhesive double-fixation cements for indirect restorations in terms of physical and mechanical properties. Materials and methods. For comparison, in terms of physical and mechanical parameters, a self-etching self-adhesive composite cement for indirect restorations "Maxcem Elite", Kerr, California, USA was taken. "Maxcem Elite" refers to self-etching self-adhesive composite cements of double fixation, which has a number of positive qualities, such as high physical and mechanical properties, good aesthetic properties, radiopacity. We analyzed the following physical and mechanical parameters: the appearance of the paste, depth of hardening, mm, diametric strength, MPa, conical yield point according to Heppler, MPa, hardness according to Heppler, MPa, water absorption in 7 days, μg/mm3, water solubility in 7 days μg/mm3, adhesive strength, MPa, peel strength, MPa. Results and discussion. According to the average test depth of hardening (mm) material "Maxcem Elite" is inferior to others: material Bifix QV by 14.9% and Relyx U 100 by 13.3%. This does not significantly affect the quality of the connection of the adhesive structure with the hard tissues of the tooth, especially due to the method we have developed for the preparation of abutment teeth in the manufacturing of adhesive pads. On the other hand, according to the average value of the index of diametrical strength (MPa), the studied material "Maxcem Elite" is by 17.2% better than Bifix QV, and by 17.3% better than Relyx U 100. Comparing these and other physical and mechanical properties of materials on average, one must bear in mind the random nature of these values. From the results of the study, it can be seen that the difference between the indicators of the Maxcem Elite material and analogues is confirmed at a very high level of significance. The study of the level of water absorption indicates the probable absence of variability of the indicator of the studied material in comparison with comparable analogs. The value of the water solubility index of all the composites under study practically does not differ from the value of "Maxcem Elite" (within (2.5±0.1) %), and corresponds to the requirements of ISO 4046. Conclusion. The research results show that the investigated composite material "Maxcem Elite" in the main parameters corresponds to analogs, in most of the indicators it combines their best characteristics. In it, the adhesive strength of the connection with the hard tissues of the tooth is noticeably enhanced and better peel strength makes it possible to profitably use this material "Maxcem Elite" for fixing the adhesive structures
8
Mamatov, Farmon, Uktam Umurzakov, Bakhadir Mirzaev, Nurbek Rashidov, Guzal Eshchanova, and Ikrom Avazov. "Physical-mechanical and technological properties of eroded soils." E3S Web of Conferences 264 (2021): 04065. http://dx.doi.org/10.1051/e3sconf/202126404065.
Повний текст джерелаАнотація:
The research aims to study and analyze the physical-mechanical and technological properties of eroded soils in Uzbekistan. The data on the susceptibility of water erosion to sloping lands is presented. The average monthly indicators of precipitation over the last ten years in Uzbekistan are analyzed. The results of determining the moisture, density, and hardness of the soil of slopes are presented. It has been established that with the traditional technology of tillage on moisture, density, and other technical properties of soil of slopes, water erosion and slope of fields have a significant effect. The physical-mechanical and technological properties of soil of the arable and subsurface layers of the soil of the top, the middle and lower part of the slope in spring and after grain harvesting differs significantly: in the spring period, the moisture of soil layers 0-10; 10-20; 30-40; 40-50 and 50-60 cm of the lower part of the slope is more moisture content of these layers of the top respectively, 1.16; 1.24; 1.1; 1.4; 1.54 and 2.15 times. Approximately such a picture of moisture is preserved after grain harvesting as well.
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Babić, Tomislav, Marko Kršulja, and Maja Šupuković. "Mechanical load caused by physical activity by wearing military equipment." Zbornik Veleučilišta u Rijeci 9, no. 1 (2021): 387–99. http://dx.doi.org/10.31784/zvr.9.1.24.
Повний текст джерелаАнотація:
In this paper fatigue for professional soldier caused by active physical activity and endurance limits is investigated. The resulting workload is one of indicators of how training, preparedness and other acquired work skills can contribute to the human body being a large working “machine”. Ergometry test was conducted and field test for soldier fitness condition and energy expenditure was measured regarding the level of body’s metabolism. Field test consisted of three runs on a polygon of 10 km and different workloads, the energy consumption was monitored. Work load was compared with Occupational Safety and Health law acts. The results showed difference in workload conditions and hart rate which allowed to determine rest spots and safety in training conditions.
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Filho, Oswaldo Julio Vischi, Zigomar Menezes de Souza, Gustavo Soares de Souza, Reginaldo Barbosa da Silva, José Luiz Rodrigues Torres, and Márcio Emanuel de Lima. "Physical attributes and limiting water range as soil quality indicators after mechanical harvesting of sugarcane." Australian Journal of Crop Science 11, no. 02 (February 20, 2017): 169–76. http://dx.doi.org/10.21475/ajcs.17.11.02.p215.
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11
Lytvynenko, Anatoаlii, and Oleksandr Alieksieienko. "Assessment of physical and mechanical indicators of sandy soils by static and dynamic probing data." Automobile Roads and Road Construction, no. 110 (2021): 18–25. http://dx.doi.org/10.33744/0365-8171-2021-110-018-025.
Повний текст джерелаАнотація:
In the work, on the basis of the analysis of tabular data of both current and former normative documents on engineering-geological surveying and design of soil bases and foundations of structures and literary sources, as well as own experience, a graphical and analytical interpretation of determination of the basic values of physical-mechanical normative and calculated indices of sandy soils according to the indicators of static q, MPa and dynamic RD, MPa probing are given. The use of the proposed empirical analytical dependencies can significantly accelerate the processing of field engineering-geological surveying and provide more objective comparison of such soils condition at different objects while making design decisions. They can also be used in the development of resident software, in case of its development and manufacture for automatically calculating the values of the physical and mechanical parameters of sandy soils. The obtained analytical dependencies are presented in the form of two tables for different types of sandy soils: separately for surveying that are carried out using both static and dynamic probes. And the graphs allow you to visually compare these dependencies, that can provide new material for further scientific generalizations and conclusions in the field of soil science and mechanics.
12
Parshyna, Olena, Marharyta Parshyna, Yurii Parshyn, Anna Gurenko, Iurii Savchenko, and Alexander Shapoval. "Modeling of Transformation of Quality Indicators in the Process of Mechanical Processing of Products with High Physical and Mechanical Properties." IOP Conference Series: Materials Science and Engineering 1164, no. 1 (June 1, 2021): 012058. http://dx.doi.org/10.1088/1757-899x/1164/1/012058.
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Линник, Yuriy Linnik, Линник, and Vladimir Linnik. "Information System for Underground Coal Mining Output Prediction." Administration 2, no. 3 (September 17, 2014): 23–27. http://dx.doi.org/10.12737/5633.
Повний текст джерелаАнотація:
The results related to studies of indicators characterizing mechanical properties and features of coal layers’
geological structure, such as resistance to cutting for coal, layer, solid inclusions and intermediate rocks
as well as their specific content in the layer have been presented in this paper. Based on physical ideas of
how the coal layer properties influence the coal-face winning assembly’s final control elements reliability an
integrated indicator of coal layers’ breaking characteristics assessment, called the indicator of equivalent
coal layers resistance to cutting Ae has been offered. This indicator’s physical meaning is that it assesses
the coal layer’s ability to cause average loads affecting breaking final control elements’ degradation
failures characterized by indicator of coal resistance to cutting, and peak loads affecting sudden failures
characterized by a value of a generalized indicator of layer heterogeneities’ content and properties.
Practical meaning of Ae index is that it allows assess coal mining machine’s working conditions not by a set
of characteristics , but by one characteristic , when performing calculations related to coal-mining machines’
parameters definition, these machines’ performance, and other technological parameters of wide place and
coal mine as a whole.
14
ANDRONOV, S. Yu. "Influence of Method for Basalt Fibers Introduction on Physical-Mechanical Indicators of Composite Asphalt Concrete Mixes." Stroitel'nye Materialy 750, no. 7 (2018): 71–73. http://dx.doi.org/10.31659/0585-430x-2017-750-7-71-73.
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Solodkyy, S. J., Y. L. Novytskyi, N. I. Topylko, and Y. V. Turba. "Research of influence of polymer additives-stabilizers on physical-mechanical indicators and microstructure of cement ground." IOP Conference Series: Materials Science and Engineering 708 (December 19, 2019): 012107. http://dx.doi.org/10.1088/1757-899x/708/1/012107.
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Ibragimov, Alexander, Tatyana Vakhnina, and Irina Susoeva. "The improvement of composite plates’ indicators from cotton and flax spinning waste by modification of raw materials." MATEC Web of Conferences 239 (2018): 01009. http://dx.doi.org/10.1051/matecconf/201823901009.
Повний текст джерелаАнотація:
The article is devoted to solve the problem of modification of the non-returnable cotton and flax spinning waste in order to improve the physical and mechanical characteristics of composite heat-insulating plates based on these wastes. The modification of the vegetable filler with a 1% solution of sulfuric acid made it possible to increase the physical and mechanical indicators of plates. The thermal insulation properties of the composite plate material with some soft acid modification of the filler did not change significantly.
17
Wang, Ya Jun, Feng Jin, Chu Han Zhang, and Jun Wang. "Primary Physical-Mechanical Characteristics on Marine Sediments from Zhoushan Seas in Sino Mainland." Applied Mechanics and Materials 275-277 (January 2013): 273–77. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.273.
Повний текст джерелаАнотація:
Marine sediment laboratory test model was developed by excavation on site and application of GDS triaxial loading system. The grading characteristics on representative soft marine soil from Wushitang (MS1) and Dongsha Seas (MS2) were studied and the key evaluating indicators, i.e., curvature coefficient CC and non-uniform coefficient Cu were analyzed. Based on the systematically physical-mechanical test data, the constitutive model on step deviatonic-stress and strain development was researched. The result shows the exponential mapping relationship is applicable for stress-strain constitution. The fluid-solid coupling non-linear function was established by spatial pore pressure surface fitting. The key consolidation treatment for soft marine sediments was discovered.
18
Korolev, V. A. "Theoretical evaluation of a scale effect in disperse soils." Moscow University Bulletin. Series 4. Geology, no. 6 (December 28, 2017): 77–86. http://dx.doi.org/10.33623/0579-9406-2017-6-77-86.
Повний текст джерелаАнотація:
A theoretical evaluation of the scale effect in dispersed soils is considered in the engineering-geological study of various physical and physical-mechanical properties that depend on the structural inhomogeneity of the soil. Concepts and new quantitative indicators are proposed to evaluate the manifestation of the scale effect in disperse soils in relation to physical and physical-mechanical properties. A classification of structural heterogeneitysin disperse soils that affect the scale effect in them has been developed. The method for analyzing the scale effect in dispersed soils is described on the basis of the superposition principle. The theoretical model of registration of the scale effect in disperse soils is substantiated at an engineering-geological evaluation of various physical and physical-mechanical properties.
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BONDARYEVA, Аnna, Eduard KASYAN, and Оlena MOKROUSOVA. "MODELING OF QUALITY INDICATORS OF THE LEATHER COATING." HERALD OF KHMELNYTSKYI NATIONAL UNIVERSITY 299, no. 4 (October 2021): 115–22. http://dx.doi.org/10.31891/2307-5732-2021-299-4-115-122.
Повний текст джерелаАнотація:
The article is devoted to modeling the quality of leather coatings by optimizing the composition of the coating composition based on polymer film formers of different chemical nature and pigment material. Finishing coating affects the quality of the leather coating and regulates the physico-chemical, physico-mechanical and hygienic parameters of the leather semi-finished product. The quality of the leather coating is assessed by a lot of indicators. Quantitative indicators of physicochemical, physico-mechanical and hygienic properties characterize the behavior of the coating during operation. The aim of the work is to model the quality indicators of the leather coating by optimizing the composition of the coating composition obtained using pigment materials based on colored modified dispersions of montmorillonite and polymer film formers of different chemical nature. The influence of components of covering compositions on physical-mechanical and operational indicators of a covering is investigated in the work. Mathematical models were obtained using D-optimal simplex lattice plans of the experiment. Using mathematical models, the influence of individual components of the coating composition and their ratio on the quality of the leather coating is described. By multicriteria optimization of the generalized desirability function and the method of fair compromise, the optimal (rational) ratios of the components of the coating composition are obtained, which give the leather finishing coating the necessary quality indicators. The obtained experimental indicators of the properties of the leather coating are completely correlated with the indicators calculated by modeling. This confirms the reliability of the simulation results and indicate the high quality of the studied coating on the leather.
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Vititnev, Aleksandr Yur'yevich, Yuriy Davydovich Alashkevich, Natal'ya Geral'dovna Chistova, Roman Aleksandrovich Marchenko, and Venera Nurullovna Matygullina. "RESEARCH OF PHYSICAL AND MECHANICAL PROPERTIES OF WOOD-FIBER MATERIALS." chemistry of plant raw material, no. 4 (December 21, 2020): 451–57. http://dx.doi.org/10.14258/jcprm.2020048150.
Повний текст джерелаАнотація:
This paper presents the results of experimental studies of the physical and mechanical properties of wood-fiber boards of the wet production method when regulating the design and technological parameters of the grinding process. This allowed us to determine the influence of the working clearance between the grinding discs and the concentration of fibre mass with the subject to of quality change wood fiber after defibrator using the developed construction of the disc fibrillation action on the physico-mechanical properties of boards. As a result of the experiment, regression models were obtained that adequately describe the studied grinding process and allow predicting the values of physical and mechanical properties of the finished product depending on the established parameters process.
A comparative analysis of the size and quality characteristics of the fiber semi-finished product and its fractional composition when using a developed construction the disc of refiner fibrillation action and a traditional design used in industry is carried out. The preferential efficiency of the grinding process under the fibrillating effect the disc of refiner in comparison with the traditional construction disc of refiner is established. As a result, there is a significant improvement in the quality indicators of the fiber semi-finished product and its composition due to the formation and predominance in the total mass of long and thin, respectively, flexible fibrillated fibers with high tile-forming properties, which allows to increase the strength properties of the product (by 20–25%), without using binding resins.
21
Inţă, Marinela, and Achim Muntean. "Researches regarding introducing temperature as a factor in cutting tool wear monitoring." MATEC Web of Conferences 178 (2018): 01013. http://dx.doi.org/10.1051/matecconf/201817801013.
Повний текст джерелаАнотація:
Monitoring the tool state during the cutting process becomes very important since the introduction of CAM in manufacturing process. The tool life based only on economic data is not enough especially in the case precision cutting due to the scattering of tool wear which depends on much more mechanical and physical properties of the workpiece and tool materials. Attempts to assess the state of wear of the tool by direct measurement of the wear indicators have been unsuccessful due to difficult access in the cutting zone and measurement imprecision. We have so wear patterns appreciation by measuring indirect indicators of wear, the main models are based on measuring vibration, acoustic emission or cutting forces and power consumption separately or together. These models have the disadvantage that should be followed at least two indicators simultaneously for a minimum precision of the results. Considering the wear models developed over time it can be seen that there is a clear relationship between wear and stabilized temperature. The paper aims to study the introduction temperature as indirect indicator of tool state in addition to the existing indicators, this leads to increased reliability of results of monitoring of wear.
22
Huang, Xin, Jianyong Pang, Guangcheng Liu, and Yu Chen. "Experimental Study on Physicomechanical Properties of Deep Sandstone by Coupling of Dry-Wet Cycles and Acidic Environment." Advances in Civil Engineering 2020 (March 21, 2020): 1–17. http://dx.doi.org/10.1155/2020/2760952.
Повний текст джерелаАнотація:
Underground engineering, especially deep geotechnical engineering, is often affected alternately by groundwater infiltration and ventilation drying during construction and use. In addition, acid rain, mineral dissolution, acid deposition, and other factors make groundwater acidic. This caused the underground structure to erode and has also threatened its safety and durability. In this study, both the physical and mechanical properties under acid dry-wet (A-D-W) cycles were investigated. Deep sandstone was treated repeatedly under acid cycling, and its physical parameters were measured. Uniaxial compressive strength tests and microtests were carried out. Finally, using a combination of scanning electron microscopy (SEM) and backscatter electron images (BSE), the microstructural changes of sandstone under the combined action of an acidic environment and a dry-wet cycle were described. The test results show that the mass, P-wave velocity, peak stress, and elastic modulus of sandstone after the A-D-W cycles decreased by 0.43%, 7.87%, 70.20%, and 88.10%, respectively. With the increase in the number of cycles, the loss of these indicators increased. However, the peak strain increased with an average increase of 55.8%. In addition, 10 cycles are the critical point for physical and mechanical indicators of the A-D-W cycles. After 10 cycles, the changes of various indicators increase rapidly. Microscopic analysis shows that the reasons of this phenomenon were that the specimen was corroded by the sulfuric acid solution, which resulted in the development of pores and cracks and the decline of physical and mechanical properties. Conversely, the development of pores was hindered by sediment, which slowed down the decline rate of the physical and mechanical indexes of specimens, but this phenomenon disappeared with the increase of A-D-W cycles. Based on the analysis of the experimental phenomena, the constitutive model of uniaxial compression based on Weibull damage variable has been established in this article, and the model has the best effect in acid solution with less cycle times or pH value of solution greater than 6.
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Изтаев, Ауелбек, Галия Куандыковна Искакова, Мадина Асатуллаевна Якияева, Бауыржан Ауелбекович Изтаев, and Зайра Сатаевна Уйкасова. "Research of physical and mechanical properties, chemical composition and safety of melon variety «torpedo»." Food processing industry, no. 11 (November 5, 2021): 88–91. http://dx.doi.org/10.52653/ppi.2021.11.11.016.
Повний текст джерелаАнотація:
Представлены результаты исследований физико-механических свойств, химического состава и показателей безопасности составных частей (мякоть, кожура, семена) дыни сорта «Торпеда». В результате сопоставительного анализа химического состава мякоти, кожуры и семян дыни показано их существенное различие. Так, содержание жира в мякоти составляет 0,26±0,003 г, в кожуре - 1,24±0,01 г, в семенах - 26,21±0,31, содержание белка составляет 7,56±0,11; 9,92±0,14 и 21,52±0,32 г соответственно. Изучение содержания редуцирующих веществ и сырой клетчатки показало их высокое содержание в кожуре по сравнению с мякотью и семенами. Установлено, что высокое содержание калия (934,88±14,02 г) и натрия (270,54±3,78 г) сосредоточены в мякоти, высокое содержание железа (15,12±0,23) - в кожуре, а высокое содержание фосфора (854,72±0,82 г) - в семенах. По результатам исследований доказано, что показатели безопасности дыни сорта «Торпеда» полностью соответствуют требованиям ТР ТС 021/2011. The results of studies of the physical and mechanical properties, chemical composition and safety indicators of the constituent parts (pulp, peel, seeds) of «Torpedo» melon are presented. As a result of a comparative analysis of the chemical composition of the pulp, peel and seeds of the melon, their significant difference was shown. Thus, the fat content in the pulp is 0.26±0.003 g, in the peel - 1.24±0.01 g, in the seeds - 26.21±0.31, the protein content is, respectively, 7.56±0.11; 9.92±0.14 and 21.52±0.32 g. The study of the content of reducing substances and crude fiber showed their high content in the peel, in comparison with the pulp and seeds. It was found that a high content of potassium (934.88±14.02 g) and sodium (270.54±3.78 g) are concentrated in the pulp, a high content of iron (15.12±0.23) - in the peel, and a high phosphorus content (854.72±0.82 g) - in seeds. According to the research results, it has been proven that the safety indicators of the Torpedo melon fully comply with the requirements of TR CU 021/2011.
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Korobeynikova, L. G., and S. A. Musa Djamil. "The Influence of Qualitative Relationship between General Physical Training and Professionally-Applied Training on the Improvement of Psycho-Physiological Properties of Female Students-Designers." Ukraïnsʹkij žurnal medicini, bìologìï ta sportu 7, no. 1 (March 22, 2022): 331–36. http://dx.doi.org/10.26693/jmbs07.01.331.
Повний текст джерелаАнотація:
The purpose of the study was to determine the qualitative ratio of general physical training and professional-applied training to the impact on the process of improving the psycho-physiological properties of female students-designers. Materials and methods. Testing of control and experimental groups was conducted at the initial and final stages of the experiment, which lasted throughout the school year of 2019-2020. A test battery was used to evaluate professionally significant properties. It consisted of tests to assess the speed of visual-motor response; a comprehensive test aimed at determining the accuracy of multidirectional speed and power movements over time (according to the computer program "Psychophysiologist"); determination of static equilibrium; assessment of dynamic equilibrium; determining the distribution of attention; the amount of short term memory; determining the distribution of attention and speed of operational thinking; speed, switching, concentration and accuracy of the task were determined on a special device. In order to evaluate the effectiveness of alternative physical education programs with elements of professional and applied physical training, an 8-month pedagogical experiment was organized. Results and discussion. Studies have shown that in students of the control group under the influence of traditional physical education program (without elements of professional and applied physical training) during the pedagogical experiment the indicators of professionally significant properties changed significantly by 15%. In the experimental group 1 under the influence of the program of physical education with elements of professional and applied physical training, there is a significant improvement in the manifestation of indicators of professionally significant properties by 45%. The most significant positive changes were observed in terms of static and dynamic balance, speed of attention, simple visual-motor reaction and mechanical memory. The students of the second experimental group show more pronounced and significantly quantitative changes in the indicators of professionally significant properties. This is due to the implementation of an experimental program of physical education with an increased (50%) amount of professional and applied physical training. These changes affected 95% of the analyzed indicators registered. The only exception was the indicators of the speed of attention, which increased by only 4.6%. It can be noted that the second experimental program has a more effective impact on the manifestation of professionally significant characteristics of female students. A comparative analysis of changes in the indicators of professionally significant characteristics of students of the third experimental group at the beginning and end of the pedagogical experiment gave grounds to establish that the physical education program with 75% of professional and applied physical training, leads to minor changes compared to the second program. In particular, these include indicators of static and dynamic equilibrium, simple visual-motor reaction, comprehensive coordination test, mechanical memorization, speed of operational thinking. Thus, the experimental program on physical education with 75% of professional and applied physical training, as well as the program with 50% of professional and applied physical training, is more effective and professionally oriented than the experimental program with 25% of professional and applied physical training, and traditional for higher education institutions. However, the second experimental program in physical education looks more optimal in terms of the group of analyzed indicators than the third experimental program, because in it most of the features change positively and have a better quality expression. Conclusion. The experimental program 2 (50% of professional and applied physical training) proved to be the most effective. Its implementation made it possible to observe a significant improvement of 60% of general physical training indicators in the students of experimental group 2. Psychophysiological indicators in students of this group are more pronounced in a positive direction
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Godek, Piotr, Piotr Murawski, Wojciech Ruciński, and Michał Guzek. "Biological, Mechanical or Physical? Conservative Treatment of Cervical Radiculopathy." Ortopedia Traumatologia Rehabilitacja 22, no. 6 (December 31, 2020): 409–19. http://dx.doi.org/10.5604/01.3001.0014.6045.
Повний текст джерелаАнотація:
Background. There is equivocal evidence in support of the effectiveness of each of the three co-existing approaches to conservative treatment of cervical radiculopathy (CR): biological (regenerative), mechanical (decompression) and physical (analgesic and anti-inflammatory). The aim of the study was to compare the effectiveness of the three treatment approaches in CR. Material and methods. A total of 90 patients were assigned to six treatment groups. Biological treatment: 4 ultrasound-guided periradicular injections of ACS or PRP (1 per week); Mechanical treatment: manual therapy (MT) or traction therapy (TT) - 8 sessions (two per week); Physical treatment: laser therapy (LT) or collagen magnetophoresis (CM) - 8 sessions (two per week). Assessment: before therapy (W0), after completion of the treatment (W1), two months after completion (W2). Assessment tools: NRS (0-10), NDI (0-50), cross section root area in mm2 in ultrasound examination (CRA) and hand sensorimotor function test (DPT). Results. The largest reduction in mean NRS, NDI and CRA values at W2 was observed with the biological treatments (NRS: ACS 71.7%, PRP 70.6%, NDI: ACS 61.5%, PRP 56.6%, CRA: ACS 23.6 %, PRP 25%). Improvement of hand sensorimotor functions was observed at both W1 and W2 only in the PRP group. The PRP group demonstrated a stronger analgesic effect than the ACS group at W1 (58.82% compared to 43.39%), but ACS therapy had the same effectiveness during the follow-up period. Other methods reduced pain and disability at W1, but further reduction of mean NRS values during the follow-up period was only evident in the CM group (32.25%), very mild in the MM (19.35%) and LT groups (18.75%), and the TT group actually demonstrated a regression (-5.58%). In 3 cases, TT exacerbated the symptoms, which resulted in termination of the therapy. Conclusions. 1. Biological treatments were more effective than mechanical and physical therapies in reducing pain, improving the disability index and proprioception of the hand both immediately on completion of therapy and after a follow-up period, which may suggest their regenerative properties. 2. Physical and mechanical therapies produced improvement in the above-mentioned indicators on completion of the therapy, but subsequently exerted a very slight effect during the follow-up period without evident regenerative effects; moreover, a regression of the results was actually recorded for traction therapy. 3. Caution should be paid when using traction therapy in the acute period of root oedema, due to possible signs of intolerance of the procedure and exacerbation of the discomfort.
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Montaev, S. A., N. В. Adilova, and B. T. Shakeshev. "Influence of montmorillonite clay on the physical and mechanical properties of the ceramic mass." Bulletin of Kazakh Leading Academy of Architecture and Construction 79, no. 1 (March 30, 2021): 255–61. http://dx.doi.org/10.51488/1680-080x/2021.1-33.
Повний текст джерелаАнотація:
The intensification of the growth of industrial production of building materials causes an urgent need for economical use of material and fuel and energy resources, especially in such an energy-and resource-intensive industry as the production of construction ceramics. To improve the physical and mechanical properties of building ceramics, to reduce energy consumption during drying, as well as to increase the strength indicators, pilot tests of the influence of bentonite clay w for obtaining face wall ceramics were carried out. The regularities of the structure and phase formation of the ceramic composition depending on the firing temperature have been established. Modification of the raw mixture with bentonite clay to assess the increase in strength by 20-30% with a general decrease in the firing temperature by 100-120 ° C.
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Khlybov, A. A., Yu G. Kabaldin, M. S. Anosov, and D. A. Ryabov. "Influence of Long-Term Operation on Physical and Mechanical Properties and Cold Resistance Indicators of Pipe Steel 10G2." Bulletin of Kalashnikov ISTU 24, no. 1 (April 6, 2021): 38. http://dx.doi.org/10.22213/2413-1172-2021-1-38-44.
Повний текст джерелаАнотація:
Проведено исследование влияния длительности эксплуатации магистрального газопровода на изменение физико-механических характеристик показателей хладостойкости трубной стали 10Г2.Установлено, что в процессе длительной эксплуатации стали 10Г2 в составе магистрального газопровода наблюдается изменение структуры металла, при этом происходит перераспределение перлитной составляющей и укрупнение зерен. Получены значения микротвердости исследуемой стали до и после эксплуатации (10, 25, 40 лет). Длительная эксплуатация (40 лет) материала труб приводит к росту значений микротвердости с 1518 до 2786 HV. Выявлено двукратное снижение значений ударной вязкости стали 10Г2 после старения и эксплуатации в течение 25 лет. Также наблюдается значительное повышение температуры вязкохрупкого перехода, что снижает надежность магистральных трубопроводов. В результате испытаний стали 10Г2 в широком диапазоне температур после 25 лет эксплуатации наблюдается снижение пластичности металла (относительное удлинение уменьшается примерно в 1,6 раза), повышение предела прочности и снижение предела текучести (до 9 %).Предложена методика неразрушающего контроля деградации механических свойств стали 10Г2 в процессе эксплуатации изделий. Установлена зависимость акустического параметра D, рассчитанного на основе скорости распространения продольных и поперечных упругих волн в металле от срока эксплуатации газовых магистральных труб и температуры вязкохрупкого перехода для стали 10Г2. Показано, что предложенный акустический параметр может выступать в качестве характеристического параметра хладостойкости материала магистральных газопроводов и использоваться при технической диагностике для оценки их остаточного ресурса.Исследование выполнено по гранту РНФ № 19-19-00332 «Разработка научно обоснованных подходов и аппаратно-программных средств мониторинга поврежденности конструкционных материалов на основе подходов искусственного интеллекта для обеспечения безопасной эксплуатации технических объектов в арктических условиях».
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Zhukova, Lyubov, and Diana Baisheva. "Design of equipment for mas-wrestling." E3S Web of Conferences 164 (2020): 14005. http://dx.doi.org/10.1051/e3sconf/202016414005.
Повний текст джерелаАнотація:
The present research considers the elaboration of an item of sports equipment – a stick for mas-wrestling. The paper describes the design process of this equipment taking into account physical and mechanical properties and material roughness, as well as sportsmen’s anthropometry parameters according to their weight category. A classification of sportsmen by anthropometry indicators was elaborated, that contains three groups and provides for age groups. The material to produce the equipment for mas-wrestling was chosen based on a comparative analysis of physical and mechanical properties of materials.
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Jurabayev, Nozimjon, Shakhboz Shogofurov, Kurbonali Kholikov, and Umarjon Meliboev. "Study of the fabric structure influence on the physical-mechanical and technological properties of knitted products." E3S Web of Conferences 304 (2021): 03030. http://dx.doi.org/10.1051/e3sconf/202130403030.
Повний текст джерелаАнотація:
Three kinds of knitted fabrics with high shape retention capacity equipment LONG-XING SM 252 (China) 12-grade flat needle loom were produced, their technological characteristics were compared, and graphical records were supplied in this article based on experimental samples of knitted rubber fabric. The developed variants of knitted fabric differ from each other in pattern type, report, shape retention feature and a number of other indicators. Physical and mechanical properties of the obtained samples were determined experimentally on modern equipment installed in the testing laboratory of the Namangan Institute of Engineering Technology.
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Boonsiriwit, Athip, Pontree Itkor, Chanutwat Sirieawphikul, and Youn Suk Lee. "Characterization of Natural Anthocyanin Indicator Based on Cellulose Bio-Composite Film for Monitoring the Freshness of Chicken Tenderloin." Molecules 27, no. 9 (April 25, 2022): 2752. http://dx.doi.org/10.3390/molecules27092752.
Повний текст джерелаАнотація:
Intelligent packaging with indicators that provide information about the quality of food products can inform the consumer regarding food safety and reduce food waste. A solid material for a pH-responsive indicator was developed from hydroxypropyl methylcellulose (HPMC) composited with microcrystalline cellulose (MCC). MCC at 5%, 10%, 20%, and 30% w/w was introduced into the HPMC matrix and the physical, barrier, thermal, and optical properties of the HPMC/MCC bio-composite (HMB) films were analyzed. At 5, 10, and 20% MCC, improved mechanical, transparency, and barrier properties were observed, where HMB with 20% of MCC (H20MB) showed the best performance. Therefore, H20MB was selected as the biodegradable solid material for fabricating Roselle anthocyanins (RA) pH sensing indicators. The performance of the RA-H20MB indicator was evaluated by monitoring its response to ammonia vapor and tracking freshness status of chicken tenderloin. The RA-H20MB showed a clear color change with respect to ammonia exposure and quality change of chicken tenderloin; the color changed from red to magenta, purple and green, respectively. These results indicated that RA-H20MB can be used as a biodegradable pH sensing indicator to determine food quality and freshness.
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Boonsiriwit, Athip, Pontree Itkor, Chanutwat Sirieawphikul, and Youn Suk Lee. "Characterization of Natural Anthocyanin Indicator Based on Cellulose Bio-Composite Film for Monitoring the Freshness of Chicken Tenderloin." Molecules 27, no. 9 (April 25, 2022): 2752. http://dx.doi.org/10.3390/molecules27092752.
Повний текст джерелаАнотація:
Intelligent packaging with indicators that provide information about the quality of food products can inform the consumer regarding food safety and reduce food waste. A solid material for a pH-responsive indicator was developed from hydroxypropyl methylcellulose (HPMC) composited with microcrystalline cellulose (MCC). MCC at 5%, 10%, 20%, and 30% w/w was introduced into the HPMC matrix and the physical, barrier, thermal, and optical properties of the HPMC/MCC bio-composite (HMB) films were analyzed. At 5, 10, and 20% MCC, improved mechanical, transparency, and barrier properties were observed, where HMB with 20% of MCC (H20MB) showed the best performance. Therefore, H20MB was selected as the biodegradable solid material for fabricating Roselle anthocyanins (RA) pH sensing indicators. The performance of the RA-H20MB indicator was evaluated by monitoring its response to ammonia vapor and tracking freshness status of chicken tenderloin. The RA-H20MB showed a clear color change with respect to ammonia exposure and quality change of chicken tenderloin; the color changed from red to magenta, purple and green, respectively. These results indicated that RA-H20MB can be used as a biodegradable pH sensing indicator to determine food quality and freshness.
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Boonsiriwit, Athip, Pontree Itkor, Chanutwat Sirieawphikul, and Youn Suk Lee. "Characterization of Natural Anthocyanin Indicator Based on Cellulose Bio-Composite Film for Monitoring the Freshness of Chicken Tenderloin." Molecules 27, no. 9 (April 25, 2022): 2752. http://dx.doi.org/10.3390/molecules27092752.
Повний текст джерелаАнотація:
Intelligent packaging with indicators that provide information about the quality of food products can inform the consumer regarding food safety and reduce food waste. A solid material for a pH-responsive indicator was developed from hydroxypropyl methylcellulose (HPMC) composited with microcrystalline cellulose (MCC). MCC at 5%, 10%, 20%, and 30% w/w was introduced into the HPMC matrix and the physical, barrier, thermal, and optical properties of the HPMC/MCC bio-composite (HMB) films were analyzed. At 5, 10, and 20% MCC, improved mechanical, transparency, and barrier properties were observed, where HMB with 20% of MCC (H20MB) showed the best performance. Therefore, H20MB was selected as the biodegradable solid material for fabricating Roselle anthocyanins (RA) pH sensing indicators. The performance of the RA-H20MB indicator was evaluated by monitoring its response to ammonia vapor and tracking freshness status of chicken tenderloin. The RA-H20MB showed a clear color change with respect to ammonia exposure and quality change of chicken tenderloin; the color changed from red to magenta, purple and green, respectively. These results indicated that RA-H20MB can be used as a biodegradable pH sensing indicator to determine food quality and freshness.
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Wu, Fu Sheng, and Shui Wen Liu. "Outburst Hazard Prediction Based on the Monitoring Data in Heading Face." Advanced Materials Research 734-737 (August 2013): 786–90. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.786.
Повний текст джерелаАнотація:
To analyse the outburst hazard of heading face in real time, based on the mechanism of coal and gas burst and its forecasting principle, four real-time predictive indicators were proposed, which involve three aspects: crustal stress, gas, physical and mechanical properties of coal, and had a verification test. The results show that the real-time predictive indicators are in good agreement with the traditional indicators, whose deviation are mainly caused by gas exceeded. With the monitoring data in monitoring system, the outburst hazard of heading face could be predicted in real time, which could help to prevent outburst.
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Конох, А. П., and Є. О. Карабанов. "Effect of Kettlebell Lifting on Physical Condition of Future Mechanical Engineers." Teorìâ ta Metodika Fìzičnogo Vihovannâ, no. 2 (August 6, 2016): 6–10. http://dx.doi.org/10.17309/tmfv.2016.2.1157.
Повний текст джерелаАнотація:
The objective of the paper is to study the effect of exercises with kettlebell lifting elements on the physical condition of future mechanical engineers.
Materials and methods. To address the tasks set, the study used the following research methods: theoretical analysis and collation of literary sources; implementation of a pilot program of physical education through kettlebell lifting in higher agricultural educational institutions; methods of mathematical statistics.
Research results. The paper focuses on the relevant issue of theoretical and methodological support of the process of improving students' physical condition. The study has determined the effect of kettlebell lifting on the physical condition of the future mechanical engineers involved in maintenance and repair of agricultural equipment and machinery. Kettlebell lifting proves to provide good physical training, has a positive effect on the human body, and strengthens health in general. The research conducted gave grounds to determine that the level of the physical condition of the test group students is satisfactory on all indicators. This meets the requirements set before the future specialists.
Conclusions. The study of the effectiveness of kettlebell lifting influence on the physical condition of the test group students yielded positive results. As a result, the training improves the performance of the students’ respiratory and cardiovascular systems, decreases their heart rate and blood pressure, enhances economization of the body systems performance at rest and at load, boosts the reserve capacity of these systems, reduces the recovery period after load, and improves the metabolic processes, which contributes to enhancing the organism tolerance to the unfavorable factors of the profession-related activity.
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Umarov, S. H., A. Batirova, A. Ruziev, S. Oserbaeva, and M. Zikirova. "Effect of external environmental factors on the technological and physical-mechanical properties of silkworm." E3S Web of Conferences 244 (2021): 02032. http://dx.doi.org/10.1051/e3sconf/202124402032.
Повний текст джерелаАнотація:
In this article, we have studied the extent to which the technological performance of mulberry silkworms on the industrial hybrids “Musaffo Tola 1” and “Musaffo Tola 2” changes during the hot summer days and these hybrids retain their potential even in adverse stress conditions. Import varieties of “Jingsong x Hoayou” and “Hoayou x Jingsong” hybrid combinations were selected as control hybrids. This Chinese hybrid is the most imported hybrid in Uzbekistan. The purpose of our experiments is to assess the resistance of domestic and import varieties of hybrids to high temperatures on the basis of technological indicators. Changes in the biological performance of import varieties of and domestic hybrids under stress conditions, in particular, a decrease in the viability of worms, an increase in the percentage of deaf and black cocoons, and changes in technological properties were studied.
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RIPKA, Galyna, Ievgen MAZNIEV, Olha TIELUSHKINA, and Iryna ZASORNOVA. "METHOD OF ASSESSING THE INFLUENCE OF WASHING ON PHYSICO-MECHANICAL INDICATORS OF FABRIC." Herald of Khmelnytskyi National University 305, no. 1 (February 23, 2022): 228–32. http://dx.doi.org/10.31891/2307-5732-2022-305-1-228-232.
Повний текст джерелаАнотація:
The article considers an improved method of comprehensive assessment of the impact of washing at home on the physical and mechanical properties of textile materials intended for the manufacture of children’s casual wear. In developing the methodological basis for assessing the change in the properties of fabrics from washing, we used the results of our own observations, which allowed us to analyze the operating conditions of preschool children’s clothing, activities and characteristic movements of children on playgrounds, identify key factors of destruction of products. features, topography of wear, frequency of cleaning from dirt, method of drying, etc. Thus, it can be argued that the shrinkage of fibrous systems depends on a sufficient number of factors that can affect simultaneously and comprehensively, and therefore this process should be classified as multifactorial and difficult to study, as the evaluation method used today is insufficient informative. The maximum allowable norms of such indicators as breaking characteristics up to (-15%) have been established; air permeability coefficient up to (-15%); abrasion resistance on the plane up to (-30%); thickness up to (+20%). The recommended method has been tested experimentally. Evaluation of changes in physical and mechanical characteristics of samples from the impact of repeated processing in the washing bath of a new recipe, close to home, was performed after each wash cycle using informative indicators such as breaking force based on Po, (N) air permeability coefficients Kp (dm3/m2·s) resistance of samples to abrasion in the plane Cs (cycles) and its thickness L (mm). The obtained results show the dependence of all indicators without exception on the number of washing cycles in soap and soda solution, with such as bursting loads of samples, their resistance to abrasion on the plane and air permeability decreases, and thickness increases compared to initial characteristics. The textile material should be considered resistant to the number of washing cycles in the soap and soda solution, which led to a change in at least one of the four criteria to the specified maximum allowable values.
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Medvedev, Vitaliy, Iryna Plisko, and Svitlana Nakisko. "Scientific basis of precision mechanical tillage and perspectives of its implementation in Ukraine." Visnyk of the Lviv University. Series Geography, no. 51 (December 27, 2017): 234–46. http://dx.doi.org/10.30970/vgg.2017.51.8862.
Повний текст джерелаАнотація:
Precision mechanical tillage is a fundamentally new agricultural strategy of farming, which is based on the use of information technology and new technical means and involves the implementation of technological measures for the main and pre-sowing tillage, taking into account the spatial heterogeneity of the physical properties of the root-content layer as indicators of differentiation of field tillage. In the article were presented the main provisions and stages of the method of determining the soil spatial heterogeneity of the plot. It was characterized indicators of precision mechanical soil tillage and promising methods for measuring parameters for precision tillage, including technical and software. It was proposed the preliminary norms of the physical properties of the treated layer for substantiation of the intensity of the basic mechanical soil tillage. It was proposed the characteristic of the main stages of the transition to precision farming and the mechanisms that should ensure its effective functioning, it was calculated the expected economic efficiency of precision farming. In the article was analyzed the spatial heterogeneity of arable land of Ukraine in terms of basic physical characteristics (structure, bulk density and penetration resistance) in the crop layer and plow sole. Some general patterns of manifestation of the spatial heterogeneity of the investigated properties of the soil cover of the land plots and the crop in all natural zones of Ukraine are analyzed, it serving as the main argument for the transition from generalized zonal technologies to precision mechanical tillage. The baseline data for the technological substantiation of the development of precision tillage (according to the content of the blocks in the seed layer) was worked out. Prospects for the introduction of precision agriculture in Ukraine are considered, based on the successful experience of mastering precision farming systems. Key words: soil, precision tillage, spatial heterogeneity, physical properties.
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Avakimyants, E. V., and V. V. Gordeev. "Physical and mechanical properties of mixtures of feed additives for cattle." IOP Conference Series: Earth and Environmental Science 979, no. 1 (February 1, 2022): 012082. http://dx.doi.org/10.1088/1755-1315/979/1/012082.
Повний текст джерелаАнотація:
Abstract Protein-mineral-vitamin supplements in the diet of cattle, in particular cows, help to increase the fat and protein content in milk, milk yield and feed conversion, and some types of additives can reduce carbon dioxide and methane emissions. The main problem of the effective use of additives is the uniformity of their distribution, due to the small amount in the total feed mixture, the total weight of additives in the diet is 1.5-2%. One of the directions for solving the problem is the development of a mixer for preliminary mixing of additives, the parameters of which are difficult to justify without studying the physical and mechanical properties of mixtures of additives. Using standard techniques and developed laboratory installations, the physicomechanical properties of mixtures of feed additives for cows used in the diets of two farms in the Leningrad Region were determined. It was revealed that more than 80% of the particles of the mixtures have sizes in the range of 0.75-0.105 mm, the bulk density of the mixtures was 905 and 911.3 kg / m3, the moisture content was 8.14 and 4.44%, the angles of repose of the mixtures were 34, 17° and 34.83°, caving angles - 25.6 ° and 25.9°, internal friction coefficients - 0.76 and 0.7, external friction (on steel) - 0.5 and 0.49. Studies have shown the similarity of the physical and mechanical properties of the mixtures, even under the condition that the proportions and properties of individual additives are different. This allows us to consider the possibility of using the average values of the indicators of physical and mechanical properties when justifying the parameters of technological equipment for mixing, transporting and storing feed additives for cattle.
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Costa, Joseane Dunga da, Jeane Cruz Portela, Phâmella Kalliny Pereira Farias, José Francismar de Medeiros, Pollyana Mona Soares Dias, Stefeson Bezerra de Melo, Rafael Oliveira Batista, Joaquim Emanuel Fernandes Gondim, and Matheus Alves Ribeiro. "Physical Indicators of Cambisols Under Agricultural Uses in Chapada do Apodi, Semiarid Region of Brazil." Journal of Agricultural Science 12, no. 6 (May 15, 2020): 170. http://dx.doi.org/10.5539/jas.v12n6p170.
Повний текст джерелаАнотація:
Soil physical structure is related to porous space dynamics, which is affected by pedogenetic conditions, land uses, and agricultural practices. Thus, the objective of this work was to evaluate physical and structural attributes of Cambissolos under different uses in the Terra de Esperança Settlement Project, in Chapada do Apodi, Governor Dix-Sept Rosado, Rio Grande do Norte, Brazil, and detect the most sensitive attributes for the distinction of environments using multivariate analysis. The study areas with different land uses were: Native Forest Area 1 (NFA1), Native Forest Area 2 (NFA2), Native Forest Area 3 (NFA3) (reference areas), Conventional Management Area (CMA) Agroecological Area (AEA), and Cajaraneira (Spondia sp.) Orchard Area (COA). Areas with agricultural uses were characterized through physical and structural analyses, using disturbed and undisturbed soil samples collected from their 0.00-0.10, 0.10-0.20, and 0.20-0.30 m soil layers. The soil classes of the areas, according to the Brazilian Soil Classification System (SiBCS) were Cambissolo Haplico Carbonatico vertissolico (NFA1); Cambissolo Haplico Ta Eutrofico tipico (NFA2 and COA); Cambissolo Haplico Ta Eutrofico vertissolico (NFA3); and Cambissolo Haplico Carbonático tipico (CMA and AEA). The results of the attributes analyzed were expressed as mean of three replications per soil layer of each area, using multivariate analysis. Soil textures varied from sandy clay loam to clay. The total sand fraction presented negative correlations with clay dispersed in water, gravimetric moisture (GM), volumetric moisture (VM), total porosity determined (TPd) and microporosity (MiP); and positive correlations with soil density (SD), and basic infiltration rate (BIR), denoting pedogenetic influence. The SD presented significant correlation with GM, VM, TPd, MiP, macroporosity (MaP), aeration porosity (AP) and BIR, denoting its importance for the physical structure of the soil, and its dynamics. The most relevant attributes for the discrimination of the soil physical structure were the inorganic fractions clay and sand, porosity, degree of flocculation, aggregates, and soil mechanical resistance to penetration. The physical and structural attributes of the Cambissolos Haplicos were generally preserved, when compared to the current conditions of the NFAs, despite the different land use and managements. However, the soils of NFA1 (0.20-0.30 m layer), CMA, and AEA areas indicate fragility in aggregate stability and degree of flocculation due to the predominance of the sand fraction. The COA presented more favorable physical and structural conditions to the development of agricultural crops, especially on the surface layers, mostly influenced by their clay, TPd, AP, GM, VM, and soil mechanical resistance to penetration.
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Michard, Frédéric. "Changes in Arterial Pressure during Mechanical Ventilation." Anesthesiology 103, no. 2 (August 1, 2005): 419–28. http://dx.doi.org/10.1097/00000542-200508000-00026.
Повний текст джерелаАнотація:
Mechanical ventilation induces cyclic changes in vena cava blood flow, pulmonary artery blood flow, and aortic blood flow. At the bedside, respiratory changes in aortic blood flow are reflected by "swings" in blood pressure whose magnitude is highly dependent on volume status. During the past few years, many studies have demonstrated that arterial pressure variation is neither an indicator of blood volume nor a marker of cardiac preload but a predictor of fluid responsiveness. That is, these studies have demonstrated the value of this physical sign in answering one of the most common clinical questions, Can we use fluid to improve hemodynamics?, while static indicators of cardiac preload (cardiac filling pressures but also cardiac dimensions) are frequently unable to correctly answer this crucial question. The reliable analysis of respiratory changes in arterial pressure is possible in most patients undergoing surgery and in critically ill patients who are sedated and mechanically ventilated with conventional tidal volumes.
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Buravchuk, N. I., and O. V. Guryanova. "Fine-grained concrete based on technogenic raw materials for road surfaces." Innovatics and Expert Examination, no. 1(31) (June 18, 2021): 152–59. http://dx.doi.org/10.35264/1996-2274-2021-1-152-159.
Повний текст джерелаАнотація:
On the basis of technogenic raw materials – ash and slag waste and burnt rocks of mine dumps – the compositions of fine-grained concrete were selected. The developed compositions have been tested in the manufacture of pilot batches of paving slabs. The introduction of fly ash and crushing screenings of burnt rocks into the composition of concrete improves the physical and mechanical properties of products with significant savings in cement. The applicability of the investigated technogenic raw materials in fine-grained concrete, intended for the manufacture of paving slabs and road paving elements, has been proved. Products have high indicators of physical and mechanical properties and quality.
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Egorov, Evgeniy N. "Study of the Effect of Silica Filler Silica 1165 on the Properties of Rubber for Rail Fastening Gaskets." Journal of Siberian Federal University. Chemistry 15, no. 1 (March 2022): 110–17. http://dx.doi.org/10.17516/1998-2836-0276.
Повний текст джерелаАнотація:
The effect of silica filler Silica 1165 instead of kaolin and carbon black N220 on the plasto-elastic, rheometric, physical-mechanical, operational and dynamic properties of rubber based on general-purpose caoutchoucs was investigated in order to develop effective noise and vibration-absorbing rubber gaskets of rail fasteners for railway tracks. It has been established that the developed rubber with a sulfur vulcanizing system based on SKMS-30ARK, SKI-3 и SKD caoutchoucs with Silica 1165 additives has improved plasto-elastic and rheometric indicators, satisfactory physical and mechanical properties, is characterized by an increase in the vibration-absorbing properties of rubber, which is the determining factor for under-rail pads
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Rahmatova, Sadoqat, Nozimjon Jurabayev, and Qurbonali Holikov. "Study of the effect of the introduction of the back yarn on two-layer knitted fabric’s physical and mechanical properties." E3S Web of Conferences 304 (2021): 03034. http://dx.doi.org/10.1051/e3sconf/202130403034.
Повний текст джерелаАнотація:
In this research work, the physical and mechanical properties of 3 variants of jacquard knitted fabric obtained in order to increase the heat retention properties and increase the range of knitted fabrics by adding back yarn to the base of glad, rubber cuts in 20 grade double-needle jacquard knitting machine using local raw materials effectively The technological indicators were obtained experimentally and tabulated and recommendations for production sectors are given.
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Belenikin, Vladimir V., and Alina S. Pulkova. "Comparative characteristics of the physical and mechanical properties of andesite-basalts of Zimin and Kamen volcanoes." RUDN Journal of Engineering Researches 20, no. 2 (December 15, 2019): 184–92. http://dx.doi.org/10.22363/2312-8143-2019-20-2-184-192.
Повний текст джерелаАнотація:
The physical and mechanical properties of rocks are called those that determine their behavior under the influence of external forces (loads) and manifest themselves in resistance to destruction and deformation. The property of rocks to resist destruction and the formation of large residual deformations under the influence of the load or, more precisely, to perceive, without breaking down within certain limits and conditions, certain loads are called strength, and their property to change under load the shape of folding and volume is deformation. These properties express and evaluate the strength and deformation indicators. The article compares the physical and mechanical properties and structure of the effusive volcanoes of Zimin and Kamen, which are located on the Kamchatka Peninsula. The physical and mechanical properties of the effusive rocks of these volcanoes are rather well studied, which allows to make their detailed characterization, as well as to compare the rocks with each other, highlighting the similarities and differences. By analyzing the data obtained, it is possible to use this information in similar studies, identifying the results or explaining them if there are differences. The conducted studies allow to more accurately explain the influence of structural features on changes in the physical and mechanical properties of the rocks of the Kamen and Zimin volcanoes.
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Rabko, Siarhei, Aliaksandr Kozel, Ivan Kimeichuk, and Vasyl Yukhnovskyi. "Comparative Assessment Of Some Physical And Mechanical Properties Of Wood Of Different Scots Pine Climatypes." Scientific Horizons 24, no. 2 (June 23, 2021): 27–36. http://dx.doi.org/10.48077/scihor.24(2).2021.27-36.
Повний текст джерелаАнотація:
For a more efficient and rational use in the production of Scots pine wood of various geographical origin, it is necessary to know its physical and mechanical properties. The purpose of this study was to determine the physical and mechanical properties of wood of 17 climatic ecotypes of Scots pine and to carry out a comparative analysis of the indicators obtained for the studied climatypes separately and when they are grouped into subspecies in accordance with the classification of L.F. Pravdin. The range of the geographical origin of the places of seed procurement is from 47 to 62° north latitude and from 22 to 85° east longitude. The modern density universal testing machine MTS INSIGHT 100 was used for research. As a result of the research, it was found that the density of wood in an absolutely dry state varies from 370 kg/m3 (Kursk climatype) to 524 kg/m3 (Volgograd climatype), and at 12% humidity – from 397 kg/m3 (Kursk climatype) to 550 kg/m3 (Volgograd climatype). The index of the strength of wood of the studied climatypes for compression along the fibres was from 32 MPa (Kursk climatype) to 54 MPa (Volgograd climatype), and for static bending – from 55 to 92 MPa for the Vologda and Ulyanovsk climatypes, respectively. Distribution of Scots pine climatypes into subspecies in accordance with the classification of L.F. Pravdin and the obtained data on the physical and mechanical properties of wood have a certain pattern. The maximum density of wood at 12% moisture is typical for the European Scots pine subspecies is 497±8 kg/m3 , the minimum value of this indicator for the Siberian Scots pine subspecies is 423±30 kg/m3 . An intermediate position is occupied by the subspecies of Lapland pine and Forest-steppe pine with values of 483±16 and 464±12 kg/m3 , respectively. The strength index of wood in the studied subspecies for compression along the fibres ranged from 47±1 MPa (European subspecies) to 33±4 MPa (Siberian subspecies), in the Lapland pine subspecies – 44±2 MPa and somewhat lower in the Forest-steppe pine subspecies – 42±2 MPa. The maximum value of the static bending strength of wood is typical for the European pine subspecies – 78±4 MPa, and the minimum – for the Siberian pine subspecies – 61±14 MPa. This indicator turned out to be equal in subspecies of forest-steppe and Lapland pine and amounted to 72±4 MPa. The practical value of the work lies in identifying the existing differences and variability among climatypes according to the studied physical and mechanical properties of wood and selecting the most promising of them for further breeding purposes
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Tavares, Uilka Elisa, Mário Monteiro Rolim, Veronildo Souza de Oliveira, Elvira Maria Regis Pedrosa, Glécio Machado Siqueira, and Adriana Guedes Magalhães. "Spatial Dependence of Physical Attributes and Mechanical Properties of Ultisol in a Sugarcane Field." Scientific World Journal 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/531231.
Повний текст джерелаАнотація:
This study investigates the effect of conventional tillage and application of the monoculture of sugar cane on soil health. Variables like density, moisture, texture, consistency limits, and preconsolidation stress were taken as indicators of soil quality. The measurements were made at a 120 × 120 m field cropped with sugar cane under conventional tillage. The objective of this work was to characterize the soil and to study the spatial dependence of the physical and mechanical attributes. Then, undisturbed soil samples were collected to measure bulk density, moisture content and preconsolidation stress and disturbed soil samples for classification of soil texture, and consistency limits. The soil texture indicated that soil can be characterized as sandy clay soil and a sandy clay loam soil, and the consistency limits indicated that the soil presents an inorganic low plasticity clay. The preconsolidation tests tillage in soil moisture content around 19% should be avoided or should be chosen a management of soil with lighter vehicles in this moisture content, to avoid risk of compaction. Using geostatistical techniques mapping was possible to identify areas of greatest conservation soil and greater disturbance of the ground.
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Lytvynenko, Anatoliy. "On evaluation of values of physical and mechanical indicators of sand soils according to static and dynamic data of probing." Dorogi i mosti 2020, no. 22 (September 8, 2020): 161–67. http://dx.doi.org/10.36100/dorogimosti2020.22.161.
Повний текст джерела
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Buketov, А. V., Т. V. Chernyavska, T. I. Ivchenko, K. M. Klevtsov, I. P. Fesenko, and V. M. Yatsyuk. "MODIFIED EPOXY MATRIX FOR VEHICLE PROTECTION: ADHESIVE AND PHYSICAL-MECHANICAL PROPERTIES." Scientific Bulletin Kherson State Maritime Academy 1, no. 22 (2020): 163–74. http://dx.doi.org/10.33815/2313-4763.2020.1.22.163-174.
Повний текст джерелаАнотація:
The significance of application of the polymer composite materials in current technologies has been proven, since they have been demonstrating high performance parameters, offering improved adhesion failure resistance, enhanced mechanical and thermophysical properties which as a consequence enables their application under both ambient and elevated temperatures. The purpose of the current work is to investigate the influence of the phthalimide modifier on the adhesive and physico-mechanical properties of epoxy composite materials and protective coatings based on them. The ED-20 epoxy diane oligomer has been taken as the main component for the binder in the formation of epoxy materials. Polyethylene polyamine hardener has been used for the crosslinking of epoxy compositions. Phthalimide has been taken as a modifier. The molecular formula of the modifier is: C8H5NO2. The molar mass of phthalimide is 147.13 g/mol. It has been proven that with the introduction of the phthalimide modifier in the amount of 2.0 pts.wt. into 100 pts.wt. of ED-20 epoxy oligomer, the material which offers the following properties is being built up: adhesive failure resistance at breaking off - 47.7 MPa, residual stresses - 1.1 MPa. Compared to the parent epoxy matrix, these properties demonstrate an improvement of the adhesive failure resistance at breaking off by 1.9 times, and in addition to the above, the residual stresses are being reduced by 1.3 times. The composite obtained may be reasonably taken in the form of a matrix when building up an adhesive layer for protective coatings. It has been experimentally proven that in order to build up the materials which would offer improved cohesive properties, it is necessary to use a composition of the following makeup: ED-20 epoxy oligomer (100 pts.wt.), polyethylene polyamine hardener (10 pts.wt.), phthalimide modifier (0.25 pts.wt.). Compared to the parent epoxy matrix, the formation of that kind of a material provides an improvement of the following indicators of physical and mechanical properties of composites: bending critical stresses - from 48.0 MPa to 62.1 MPa; impact value - from 7.4 kJ/m2 to 14.7 kJ/m2. Note that the elasticity coefficient of this material is being reduced compared to the parent epoxy matrix from 2.8 GPa to 2.2 GPa. The composite obtained may be reasonably taken in the form of a matrix when building up the surface layer for protective coatings.
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Zyryanov, Mikhail A., Sergey O. Medvedev, and Aleksandr P. Mokhirev. "Effect of Addition of Chopped Needles on the Fiberboard Quality Indicators." Lesnoy Zhurnal (Forestry Journal), no. 3 (May 20, 2021): 125–32. http://dx.doi.org/10.37482/0536-1036-2021-3-125-132.
Повний текст джерелаАнотація:
Until recently, only the trunk of a tree was recognized as valuable in the forest industry, and everything else, including the crown, was considered waste. Logging wastes cluttered felling sites and created a favorable environment for habitation and reproduction of forest pests, as well as contributed to the emergence of forest fires. Today, wood greens are used as a raw material in the logging industry for the production of pellet fuels; in the woodchemical complex for the manufacture of chlorophyll-carotene pastes, sodium chlorophyllin, and coniferous healing extract; in agro-industrial production to obtain coniferous vitamin flour. Analysis of literature sources showed that fibreboards are widely used in housing construction as structural, finishing, and insulating materials. The advantage of fibreboards is the ability to impart special properties to them, such as fire resistance, water resistance, biostability, soundproofing, and heat-insulating ability by adding various components to the fibreboard at the manufacturing stage. Studies of the effect of adding coniferous flour on the quality indicators and physical and mechanical parameters of the finished fiberboard have been carried out in order to solve the problem of expanding the raw material base for fiberboard production. The possibility of using this raw material in the form of coniferous flour in the production of fiberboard has been substantiated. The influence of the percentage of needle flour in the total volume of wood fiber pulp and particle size on the qualitative indicators of the material is shown. Statistical and mathematical equations and graphical dependencies have been obtained. They allow predicting the indicators of fiberboards for a given content and particle size of flour from coniferous greens. The optimal size of the particles of coniferous flour and its content in the fibreboard at which the values of physical and mechanical indicators of the finished product meet the requirements of the State Standard GOST 4598-86 are determined. For citation: Zyryanov M.A., Medvedev S.O., Mokhirev A.P. Effect of Addition of Chopped Needles on the Fiberboard Quality Indicators. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 3, pp. 125–132. DOI: 10.37482/0536-1036-2021-3-125-132
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Charpentier, Victor, and Sigrid Adriaenssens. "Effect of Gravity on the Scale of Compliant Shells." Biomimetics 5, no. 1 (January 27, 2020): 4. http://dx.doi.org/10.3390/biomimetics5010004.
Повний текст джерелаАнотація:
Thin shells are found across scales ranging from biological blood cells to engineered large-span roof structures. The engineering design of thin shells used as mechanisms has occasionally been inspired by biomimetic concept generators. The research goal of this paper is to establish the physical limits of scalability of shells. Sixty-four instances of shells across length scales have been organized into five categories: engineering stiff and compliant, plant compliant, avian egg stiff, and micro-scale compliant shells. Based on their thickness and characteristic dimensions, the mechanical behavior of these 64 shells can be characterized as 3D solids, thick or thin shells, or membranes. Two non-dimensional indicators, the Föppl–von Kármán number and a novel indicator, namely the gravity impact number, are adopted to establish the scalability limits of these five categories. The results show that these shells exhibit similar mechanical behavior across scales. As a result, micro-scale shell geometries found in biology, can be upscaled to engineered shell geometries. However, as the characteristic shell dimension increases, gravity (and its associated loading) becomes a hindrance to the adoption of thin shells as compliant mechanisms at the larger scales-the physical limit of compliance in the scaling of thin shells is found to be around 0.1 m.