scholarly journals Experimental Studies on Water Absorption Behaviour of Treated and Untreated Hybrid Bio-Composites

2021 ◽  
Vol 1059 (1) ◽  
pp. 012017
Author(s):  
R Girimurugan ◽  
K.G. Saravanan ◽  
P. Manickavasagam ◽  
G. Gurunathan ◽  
M. Vairavel
Keyword(s):  
Water Absorption ◽  
Experimental Studies

Water Absorption Effect on the Propagation Velocity of Normal Waves in Composite Rebars

2019 ◽  
Vol 970 ◽  
pp. 202-209
Author(s):  
Olga V. Muravieva ◽  
Robert R. Khasanov ◽  
Viktor A. Strizhak ◽  
Sergey S. Mkrtchyan
Keyword(s):  
Water Absorption ◽  
Propagation Velocity ◽  
Mechanical Characteristics ◽  
Experimental Studies ◽  
Absorption Effect ◽  
Acoustic Waveguide ◽  
Torsional Waves ◽  
Water Absorption Effect ◽  
Waveguide Method ◽  
Physical And Mechanical Characteristics

The article proposes the use of the acoustic waveguide method with normal Pochhammer waves to estimate the water absorption of composite fiberglass rebars. The results of experimental studies on the water absorption and temperature influence on the propagation velocity of rod and torsional waves in composite rebars samples with different physical and mechanical characteristics are presented. The sensitivity of the wave velocity parameter to water absorption and temperature fluctuations is estimated. The proposed acoustic waveguide method is characterized by high accuracy, reliability and efficiency.

scholarly journals Influence of UV Radiation on Physical and Biological Properties of Rapeseed in Pre-Sowing Treatment

2021 ◽  
Vol 10 (4) ◽  
pp. 217-223
Author(s):  
Semenov Anatolii ◽  
Sakhno Tamara ◽  
Semenova Kateryna
Keyword(s):  
Moisture Content ◽  
Water Absorption ◽  
Uv Radiation ◽  
Uv Irradiation ◽  
Experimental Studies ◽  
Biological Properties ◽  
Low Doses ◽  
Seed Vigour ◽  
Positive Effect

The effect of ultraviolet radiation on pre-sowing treatment of seeds of the winter cultivar Lembke and cultivars treated with fungicides DK EXODUS, DK Exquisite and DK Exprit was studied. Experimental studies show a positive effect of UV irradiation in pre-sowing treatment of winter rapeseeds on seed vigour and germination, both when irradiated in region C (200-280 nm) and in region B (280-320 nm). It was found that UV radiation has a positive effect on the sowing qualities of winter rapeseeds varieties Lembke and DK EXODUS (treated with fungicides) when irradiated with a dose of 120 J/m2 : seed vigour increased by 11% in the variety DK EXODUS and 16.9% in the variety Lembke, germination on average by 13% compared to control samples. At doses of 250 and 500 J/m2 , a decrease in the sowing quality of seeds is observed. The main parameters of kinetic values of hydration were determined: moisture content and hydration rate. It was found that the rate of hydration increased sharply in the initial phase and gradually and slowly decreased in the middle and final phases of the hydration procedure, respectively, in order to achieve a saturated moisture content. Irradiated seeds at a dose of 120 J/m2 showed a higher rate of water absorption than the control, both in the early and later stages of the hydration procedure. It is established that UV-C irradiation changes the kinetics of water absorption by B. napus seeds at low doses of irradiation, causing faster penetration of water into the seeds and more efficient hydration of tissues, positively affecting sowing qualities and biometrics. It has been suggested that water uptake by UV-irradiated B. napus seeds causes excessive imbibition damage at higher doses of UV radiation, as the germination potential decreases and improves at low doses. No significant changes in biometric parameters were detected during UV irradiation of rapeseed varieties DK Exquisite and DK Exprit treated with fungicides and dyes.

Dome House Insulation Systems

2020 ◽  
Vol 992 ◽  
pp. 48-53
Author(s):  
E. Shokodko ◽  
Ekaterina Yu. Bobrova ◽  
E. Zinovyeva ◽  
Alexey D. Zhukov
Keyword(s):  
Water Absorption ◽  
Moisture Absorption ◽  
Experimental Studies ◽  
Adhesive Layer ◽  
Average Density ◽  
Hot Air ◽  
Living Space ◽  
Diffusion Characteristics ◽  
Insulation Systems ◽  
Interior Walls

The article presents the results of studying the possibility of using the insulation systems in the structures of rural buildings of various functional purposes, including the creating the multifunctional objects. A vegetarium dome house is considered, which unites a living area and greenhouses. The planning solution of the multipurpose domed house involves the formation of the effective insulation systems for the interior walls, protecting the living space of the interior from the heat-moisture and phytoaggressive features of the greenhouse exterior. A comparative analysis of possible heat-, water-and vapor-insulating materials for an insulating membrane has established the expedience of using the rolled foam-polyethylene fixed by an adhesive method on the external surfaces of the internal walls. Experimental studies have established that polyethylene foam with an average density of 18–20 kg/m3 has the following characteristics: the diffusion moisture absorption without any coating is 0,44 kg/m2; the diffusion moisture absorption with a metalized coating is 0,37 kg/m2; water absorption upon partial immersion in water for 24 hours is 0,013 kg/m2; volume water absorption with full immersion in water for 28 days is 0,96%. The nature of the destruction of the contact surface “foam polyethylene-metal” is cohesive in the adhesive layer, and the destructive stress is 12–17 kPa. A special feature of the polyethylene foam is the possibility of creating a jointless coating with minimal diffusion characteristics and with minimized cold bridges. The jointless cover is formed by combining the roll material into a lock, followed by hot air welding.

Experimental studies for studying the process of water absorption of apricot seeds

2020 ◽  
Vol 10 (10) ◽  
pp. 931
Author(s):  
Yamaletdinova Munira Faditovna ◽  
Narziyev Mirzo Saidovich ◽  
Hikmatov Doniyor Nematovich
Keyword(s):  
Water Absorption ◽  
Experimental Studies

scholarly journals Influence of ‘Cocos Nucifera Linn’ Fiber Volume Fraction on Water Absorption and Porosity of Foamed Concrete

2019 ◽  
Vol 8 (6) ◽  
pp. 3428-3435
Keyword(s):  
Water Absorption ◽  
Natural Fiber ◽  
Volume Fraction ◽  
Cocos Nucifera ◽  
Agricultural Waste ◽  
Experimental Studies ◽  
Coconut Oil ◽  
Absorption Capacity ◽  
Fiber Volume ◽  
Foamed Concrete

Global apprehension and governance on carbon footprint emissions have driven a considerable amount of research on green concrete around the world. In the present day, it should be acknowledged that most of the construction products are produced using materials that require a high amount of energy and not naturally sustainable which can lead to global problem. Hence, the use of natural fiber like Cocos Nucifera Linn Fiber (CNF) in foamed concrete is considered as a useful option in making concrete as a sustainable material to overcome this problem. CNF refer to agricultural waste or by-products that can be obtained through the distribution of coconut oil and can be accumulated in a large amount in Malaysia. Moreover, it should be understood that CNF fibers are often discarded as agricultural wastes. Hence, the aim of the present study is to perform experimental studies in order to discern the effect of CNF volume fraction on water absorption capacity and porosity of foamed concrete. There were total of 21 mixes were prepared and test in this study. Three densities of 650 kg/m3 , 1050 kg/m3 , and 1450 kg/m3 were fabricated. CNF was used as additives in the present study at 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, and 0.6% by volume fraction of the total mix. The results show that the water absorption of foamed concrete was slower at the beginning when it contained higher CNF volume fraction than the lower CNF volume fraction. CNF absorbed water and then expanded amid blending. CNF could anticipate fragility and lose microstructure arrangement, which reduces the capacity to oppose excessive loads. On the other hand, the porosity of foamed concrete is reduced due to the increase of CNF for each density examined in the present study. This occurs because of the reaction between the cement paste and CNF. Furthermore, higher density foamed concrete prompts the decrement of permeable structure, while the CNF serves to bridge the matrix. The arrangement of pores for plain foamed concrete without the incorporation of fiber was bigger compared to foamed concrete with the incorporation of CNF. CNF additionally helps in making an increasingly uniform distribution of the air voids. Thus, it will hinder bubbles from merging with one another

scholarly journals Choosing injectable solution for auger technology of underground space protection against pollution

2020 ◽  
pp. 106-111
Author(s):  
O Meneylyuk ◽  
A` Nikiforov ◽  
I Menejljuk ◽  
V Russyi
Keyword(s):  
Water Absorption ◽  
Water Glass ◽  
Experimental Studies ◽  
Graphical Analysis ◽  
Underground Space ◽  
Directional Drilling ◽  
Main Research ◽  
Small Width ◽  
Plastic Strength ◽  
Statistical Regularities

Purpose. The research is devoted to the experimental choice of injection composition for auger technology of installation of underground anti-filtration shields under the source of pollution. The auger technology for the arrangement of an anti-filtration shield consists of pilot holes made by the horizontal directional drilling, which is followed by the arrangement of a waterproof layer by replacing the soil with auger by special concrete solution. Methodology. The main research method is experimental-statistical modeling, which includes conducting laboratory tests; correlation-regression analysis of the obtained data; qualitative, quantitative and graphical analysis of the obtained regularities of the studied indicators change from the varied factors. Findings. The main results of the study are the following: substantiation of the relevance of the development of the auger technology for the protection of underground space; development of methods and conducting laboratory experiments in choosing the injectable solution; analysis of experimental and statistical regularities of changes in water absorption and time of plastic strength setting when varying the composition of the anti-filtration shield (concentration of fiber, bentonite, water glass); development of the concept of technology of the anti-filtration shield arrangement. Originality. Experimental studies made it possible to establish that the minimum water absorption of the shied samples is observed at the lowest concentration of fiber (0.5%), bentonite (1%) and liquid glass (2%) in the injected solution. For structures of small width (1020m), there are suitable compositions with a minimum time of plastic strength setting at a concentration of fiber (3%), bentonite (5%) and water glass (18%). For structures with a large width (4060m), there are suitable compositions with a long time of plastic strength at a concentration of fiber (9%), bentonite (5%) and water glass (6%). Practical value. Experimental results made it possible to develop technological recommendations for construction of anti-filtration shields using the auger technology. Namely: to develop a concept and procedure of works, to calculate the costs of labor and machine time, to compile a list of necessary materials, machinery and equipment.

Technology of Wood Waste Processing to Obtain Construction Material

2017 ◽  
Vol 265 ◽  
pp. 245-249 ◽  
Author(s):  
R.G. Safin ◽  
Z.G. Sattarova ◽  
E.R. Khairullina
Keyword(s):  
Composite Material ◽  
Water Absorption ◽  
Fractional Composition ◽  
Construction Material ◽  
Experimental Studies ◽  
Wood Waste ◽  
Filler Concentration ◽  
Waste Processing

The technology of wood waste processing to obtain a construction material is presented. Thermo-modified ground bark as a filler and gypsum as a binder were used in the composite. The experimental studies to determine the strength and water absorption of the composite material of the filler concentration and the fractional composition were presented. The analysis of the results was conducted.

3-D reconstruction and analysis of mammalian mitotic spindle structure

1992 ◽  
Vol 50 (1) ◽  
pp. 578-579
Author(s):  
Kent McDonald ◽  
David Mastronarde ◽  
Rubai Ding ◽  
Eileen O'Toole ◽  
J. Richard McIntosh
Keyword(s):  
Cross Sections ◽  
Mitotic Spindle ◽  
Experimental Studies ◽  
Video Camera ◽  
Three Dimensions ◽  
Mitotic Spindles ◽  
Black And White ◽  
Reconstruction Methods ◽  
Spindle Structure ◽  
Tissue Culture Line

Mammalian spindles are generally large and may contain over a thousand microtubules (MTs). For this reason they are difficult to reconstruct in three dimensions and many researchers have chosen to study the smaller and simpler spindles of lower eukaryotes. Nevertheless, the mammalian spindle is used for many experimental studies and it would be useful to know its detailed structure.We have been using serial cross sections and computer reconstruction methods to analyze MT distributions in mitotic spindles of PtK cells, a mammalian tissue culture line. Images from EM negatives are digtized on a light box by a Dage MTI video camera containing a black and white Saticon tube. The signal is digitized by a Parallax 1280 graphics device in a MicroVax III computer. Microtubules are digitized at a magnification such that each is 10-12 pixels in diameter.

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