scholarly journals Criterial models of the stem separation process when harvesting rice

2019 ◽  
Vol 126 ◽  
pp. 00009
Author(s):  
V.N. Primak ◽  
Yu.A. Tsarev ◽  
A.Yu. Popov
Keyword(s):  
Mechanical Properties ◽  
Environmental Factors ◽  
Classical Theory ◽  
Physical And Mechanical Properties ◽  
Construction Method ◽  
Separation Process ◽  
Model Construction ◽  
Statistical Studies ◽  
Grain Losses

The problem of determining the influence of several major environmental factors on the value of grain losses during rice stem separation by a vibratory grain divider is considered. It makes it possible to establish the grain loss dependences upon varying the divider's parameters obtained for polynomial and criterial models, as well as enables to confirm the advantage and feasibility of using a vibratory grain divider on windrowers for rice harvesting. The criterion equations of the stem separation process by a vibratory grain divider are developed and the dependences of the change in the loss values behind the divider when cutting upright and lodged rice are obtained. They confirm the results of statistical studies, but to a greater extent illustrate information about the stem separation process. For this research, a classical theory of similarity and modeling was used, which made it possible to develop a model construction method taking into account physical and mechanical properties of plants when they are cut with windrowers on upright and lodged agricultural backgrounds with losses in the divider zone and under the windrow in the harvest field.

Test Research on Influence of Water and Mineral Composition on Physical and Mechanical Properties of Phyllite

2014 ◽  
Vol 496-500 ◽  
pp. 2398-2401 ◽  
Author(s):  
Xin Zhe Li ◽  
Geng Feng Wang ◽  
Ling Cao
Keyword(s):  
Mechanical Properties ◽  
Mineral Composition ◽  
Physical And Mechanical Properties ◽  
Construction Method ◽  
Engineering Properties ◽  
Tunnel Construction ◽  
Regular Pattern ◽  
Initial Stress State ◽  
Influence Of Water ◽  
Relative Factors

As a regional metamorphic rock, the engineering properties of the phyllite are rather complex. It is common that the tunnel construction safety has tremendous difficulty due to the groundwater, the initial stress state, joints, cracks and faults and other factors, so it is necessary to find an effective construction method for the construction of phyllite tunnel. To master the regular pattern of the influence of relative factors on physical and mechanical properties of phyllite is the basis to establish an effective construction method. The paper tries to analyze the influence of water and mineral composition on physical and mechanical properties of phyllite by making relevant tests on Lu Lin tunnel, and hope to give some clue to the design and construction of phyllite tunnels.

scholarly journals STRENGTH CHARACTERISTICS OF POLYMER COMPOSITES BASED ON RECYCLED POLYPROPYLENE FILLED WITH RICE HUSK DURING MOISTURE ABSORPTION AND NATURAL AGIN

2020 ◽  
Vol 17 (36) ◽  
pp. 845-855
Author(s):  
Aynur R SADRITDINOV ◽  
Valentina V CHERNOVA ◽  
Marina V BAZUNOVA ◽  
Elena M ZAKHAROVA ◽  
Vadim P ZAKHAROV
Keyword(s):  
Mechanical Properties ◽  
Environmental Factors ◽  
Polymer Composites ◽  
Rice Husk ◽  
Moisture Absorption ◽  
Natural Aging ◽  
Physical And Mechanical Properties ◽  
Strength Characteristics ◽  
Continuous Increase ◽  
Recycled Polypropylene

The relevance of the issue under investigation is conditioned by an increase of the ecological burden on the environment due to the continuous increase of plastic waste, a significant proportion of polypropylene. One solution to this problem is the involvement of recycled polypropylene to obtain plastic products based on composites filled with rice husk. It makes it possible to reduce the prime cost of finished products, regulate their physical and mechanical properties, and reduce the volume of difficult-to-decompose synthetic polymers that end up in waste. The key property of polypropylene, which changes during its filling with rice husk, is moisture absorption, which contributes to a change in the strength characteristics of the polymer composite and accelerates its aging under the influence of environmental factors. In this regard, this research aims to identify the patterns of the influence of absorbed moisture and natural aging on the physical and mechanical properties of polymer composites based on recycled polypropylene filled with rice husk. The leading approach to the study of this issue is laboratory tests on the saturation of polymer composites with water of different temperatures and duration of exposure and testing materials during long-term natural aging under the influence of environmental factors. The key factor characterizing the change in the physical and mechanical properties of materials, in this case, is the elasticity modulus, elongation, and tensile stress at the break during stretching of the prototypes. The materials of the paper are of practical value for the processing of secondary thermoplastic polymers, as well as the development of biodegradable polymer composites.

scholarly journals Features of process of epoxidation of natural rubber scrap in water – xylene

2020 ◽  
Vol 168 ◽  
pp. 00039
Author(s):  
Serhii Zybailo ◽  
Viktor Ved ◽  
Denis Shapovalov
Keyword(s):  
Mechanical Properties ◽  
Power Consumption ◽  
Natural Rubber ◽  
Physical And Mechanical Properties ◽  
Separation Process ◽  
Raw Material ◽  
Reaction Volume ◽  
Qualitative Effect

The article presents the analysis of the existing methods of producing epoxidized polydiene rubbers in order to obtain new derivative materials with improved physical and mechanical properties. The study proves the use of natural rubber as a raw material for the production of epoxidized polydiene. It has been experimentally demonstrated that conducting epoxidation as a combined-separation process allows producing epoxidized rubber in one reaction volume. It has been also found that the use of a water-xylene environment for the process has a qualitative effect on the degree of epoxidation and significantly reduces power consumption.

scholarly journals Accelerated aging studies of the selected commercial films

Polimery ◽  
2021 ◽  
Vol 66 (6) ◽  
pp. 350-356
Author(s):  
Magdalena Cichecka ◽  
Beata Pałys ◽  
Bożena Wilbik-Hałgas ◽  
Marcin H. Struszczyk
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Environmental Factors ◽  
Thermal Degradation ◽  
Uv Radiation ◽  
Thermal Aging ◽  
Accelerated Aging ◽  
Physical And Mechanical Properties ◽  
Aging Studies ◽  
Aging Conditions

The Arrhenius method was used to investigate the effect of accelerated aging conditions on the physical and mechanical properties of polymer films for technical, medical, food and office applications. Temperature and UV radiation were taken into account as environmental factors. It was shown that the tested films are more sensitive to thermal degradation than UV radiation. The reduction in tensile strength after thermal aging does not exceed 40%, and in the case of UV radiation, 14%. The estimated lifetime of the tested films is over 5 years.

PEMANFAATAN KAYU AKASIA MANGIUM (Acacia mangium Willd) UNTUK MEBEL

2012 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Djoko Purwanto
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical Properties ◽  
Treatment Process ◽  
Acacia Mangium ◽  
Physical And Mechanical Properties ◽  
Wood Fibers ◽  
Test Parameters ◽  
Mechanical And Physical Properties ◽  
Scale Scores

Timber Acacia mangium (Acacia mangium, Willd) for Furniture. The study aims to determine the mechanical and physical properties and the decorative value (color and fiber) wood of acacia mangium with using finishing materials. This type of finishing material used is ultran lasur natural dof ,ultran lasur classic teak, aqua politur clear dof, aqua politur akasia dan aqua politur cherry. After finishing the wood is stored for 3 months. Test parameters were observed, namely, physical and mechanical properties of wood, adhesion of finishing materials, color and appearance of the fiber, and timber dimensions expansion. The results showed that the mechanical physical properties of acacia wood qualified SNI. 01-0608-89 about the physical and mechanical properties of wood for furniture, air dry the moisture content from 13.78 to 14.89%, flexural strength from 509.25 to 680.50 kg/cm2, and compressive strength parallel to fiber 342.1 - 412.9 kg/cm2. Finishing the treatment process using five types of finishing materials can increase the decorative value (color and fiber) wood. Before finishing the process of acacia mangium wood has the appearance of colors and fibers and less attractive (scale scores 2-3), after finishing acacia wood fibers have the appearance of colors and interesting and very interesting (scale 4-5).Keywords: mangium wood, mechanical properties, decorative value, finishing, furniture.

Physical and Mechanical Properties of Tenun Pahang Fabrics using Alternative Yarns

2016 ◽  
Vol 13 (2) ◽  
pp. 67
Author(s):  
Engku Liyana Zafirah Engku Mohd Suhaimi ◽  
Jamil Salleh ◽  
Suzaini Abd Ghani ◽  
Mohamad Faizul Yahya ◽  
Mohd Rozi Ahmad
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
The Other ◽  
Silk Fabrics ◽  
Recovery Angle ◽  
Made In

An investigation on the properties of Tenun Pahang fabric performances using alternative yarns was conducted. The studies were made in order to evaluate whether the Tenun Pahang fabric could be produced economically and at the same time maintain the fabric quality. Traditional Tenun Pahang fabric uses silk for both warp and weft. For this project, two alternative yarns were used which were bamboo and modal, which were a little lower in cost compared to silk. These yarns were woven with two variations, one with the yarns as weft only while maintaining the silk warp and the other with both warp and weft using the alternative yarns. Four (4) physical testings and three (3) mechanical testings conducted on the fabric samples. The fabric samples were evaluated including weight, thickness, thread density, crease recovery angle, stiffness and drapability. The results show that modal/silk and bamboo silk fabrics are comparable in terms of stiffness and drapability, hence they have the potential to replace 100% silk Tenun Pahang.

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