scholarly journals Effect of Parameters on the Runoff Erosion Control Performance of Structurally Modified Jute and Coir Geomeshes over Loamy Sand

Tekstilec ◽  
2021 ◽  
Vol 64 (2) ◽  
pp. 149-158
Author(s):  
Sushma Verma ◽  
◽  
Vinay Kumar Midha ◽  
Awadesh Kumar Choudhary ◽  
◽  
...  
Keyword(s):  
Slope Angle ◽  
Erosion Control ◽  
Loamy Sand ◽  
Test Results ◽  
Control Performance ◽  
Germination Test ◽  
Woven Structures ◽  
Woven Structure ◽  
Twill Weave ◽  
Bioengineering Techniques

Soil erosion is a serious environmental problem that can be controlled using bioengineering techniques. In using a bioengineering technique, temporary reinforcement is performed with geomeshes until vegetation takes root. In this study, structurally modified jute and coir geomeshes were tested for runoff erosion control and runoff volume over loamy sand at different slope angles. The laboratory results revealed that all parameters (slope angle, type of weave and type of material) had a significant effect on the erosion control performance of geomeshes. The slope angle contributed most (52.34%) to runoff erosion control, followed by weave type (25.79%) and type of material (12.28%). At lower and medium slope angles (of 15o and 30o, respectively) the twill-woven structure of coir geomeshes provided better erosion control than plain- and satin-woven structures, while plain-woven jute geomeshes demonstrated better erosion control at all slope angles. To understand the overall impact, a germination test was also conducted. According to the germination test results, the twill weave of jute geomeshes provided the highest rooting length. In general, plain-woven jute geomeshes are preferred for better erosion control on a high slope angle, while plain and twill can be used on a low slope angle.

Determination of the pore size of woven structures through image analysis

2012 ◽  
Vol 2 (1) ◽  
Author(s):  
R. Angelova
Keyword(s):  
Pore Size ◽  
Single Layer ◽  
Woven Fabric ◽  
Virtual Model ◽  
Experimental Procedure ◽  
Porosity And Permeability ◽  
Woven Structures ◽  
Woven Structure ◽  
Non Destructive

AbstractThe paper presents an experimental procedure developed for determination of the pore size, shape and distribution in a single layer woven fabric, for the construction of a virtual model to be incorporated in a future CFD software package. The procedure is based on non-destructive observation and analysis of woven samples. 14 different samples of gray fabrics of 100 % cotton in plain and twill weaves are investigated. The results obtained allow the creation of reality more realistic virtual model of the woven structure, and theoretical investigation of its porosity and permeability through computer simulation.

scholarly journals Thermo-physiological properties of woven structures in wet state

2018 ◽  
Vol 69 (04) ◽  
pp. 298-303
Author(s):  
BOUGHATTAS AMAL ◽  
BENLTOUFA SOFIEN ◽  
HES LUBOS ◽  
AZEEM MUSADDAQ ◽  
FAYALA FATEN
Keyword(s):  
Thermal Properties ◽  
Water Vapor ◽  
Moisture Content ◽  
Water Vapor Permeability ◽  
Woven Fabric ◽  
Weft Yarn ◽  
Vapor Permeability ◽  
Skin Contact ◽  
Woven Structures ◽  
Woven Structure

The utmost parameters that measure the thermo-physiological comfort of garments are thermal conductivity, thermal absorptivity and water vapor permeability. In this paper, thermo-physiological comfort was studied with different weave design and moisture content. Thermal properties and water vapor permeability in dry and wet state of all fabric samples were determined by ALAMBETA and Permetest respectively. Results showed that the weaving structure and yarn composition in weft were closely related to the thermal properties and water vapor permeability in presence of moisture. Woven fabric samples were constructed by varying the weave design and weft composition. In wet state, moisture content up to 20%, weave structures exhibited non-significant behavior for thermal properties due to air fraction. As the moisture content enhanced, woven structure made with polyester weft yarn provided cooler feeling with skin contact.

scholarly journals Effect of fungal incidence on physiological quality of tobacco seeds used in Brazil

2018 ◽  
Vol 85 (0) ◽  
Author(s):  
Mariane Sayuri Ishizuka ◽  
Maria Heloisa Duarte de Moraes ◽  
Maria Helena Carmignani Pescarin Chamma ◽  
Carlos Eduardo Pulcinelli ◽  
José Otavio Machado Menten
Keyword(s):  
Seed Treatment ◽  
Pathogenic Fungi ◽  
Test Results ◽  
Fusarium Spp ◽  
Germination Test ◽  
Tobacco Seed ◽  
Tobacco Seeds ◽  
Physiological Quality ◽  
Seeds Germination

ABSTRACT: The objectives of the present project were to evaluate the sanity and germination of tobacco seed samples cultivated in Brazil and to identify potential pathogenic fungi to the culture. Thirty-four representatives samples of tobacco seeds were evaluated through germination and sanity test by the blotter-test. On the germination test, results were expressed in percentage of seedlings considered normal, abnormal and non-germinated seeds. The percentage of seeds germination varied between 54.5 and 90%. According to sanity test, it was verified the incidence of Alternaria alternata, Cladosporium spp., Fusarium spp., and Phoma spp. The incidence of A. alternata varied from 3 to 67%, and Fusarium spp. varied from 0 to 19%. There was significative positive correlation between the incidence of A. alternata and the percentage of seed germination. Species of Alternaria and Fusarium can be potential pathogens to tobacco culture and an alarm for the necessity of seed treatment of the seeds that are transporting these fungi.

History of Bioengineering Techniques for Erosion Control in Rivers in Western Europe

2009 ◽  
Vol 43 (6) ◽  
pp. 972-984 ◽  
Author(s):  
Andre Evette ◽  
Sophie Labonne ◽  
Freddy Rey ◽  
Frederic Liebault ◽  
Oliver Jancke ◽  
...  
Keyword(s):  
Western Europe ◽  
Erosion Control ◽  
History Of ◽  
Bioengineering Techniques

Erosion Control Performance of Compost Prepared from Harvested Aquatic Weed

2008 ◽  
Vol 16 (4) ◽  
pp. 257-266 ◽  
Author(s):  
C.G. Dorahy ◽  
I. McMaster ◽  
A.D. Pirie ◽  
P. Pengelly ◽  
L.M. Muirhead ◽  
...  
Keyword(s):  
Erosion Control ◽  
Aquatic Weed ◽  
Control Performance

Stabilization and equilibrium control of a new pneumatic cart-seesaw system

Robotica ◽  
2008 ◽  
Vol 26 (2) ◽  
pp. 219-227 ◽  
Author(s):  
J. Lin ◽  
J. H. Zhan ◽  
Julian Chang
Keyword(s):  
State Feedback ◽  
Initial Position ◽  
Degree Of Freedom ◽  
Test Results ◽  
Control Performance ◽  
Proportional Valve ◽  
Pneumatic Control ◽  
Supervisory Controller ◽  
Equilibrium Control ◽  
And Control

SUMMARYThis investigation describes the mechanical configuration and control environment for a novel cart-seesaw system. This mechanism is called a super articulated mechanical system (SAMS). The system comprises a cart that slides on the pneumatic rodless cylinder. The rodless cylinder is double-acting with the carrier bracket, on which a cart is a pinion mechanism for the tracks. The cart-seesaw system brings the cart from any initial position to a desired position on the seesaw by applying an appropriate force to the cart and thus adjusting the angle of the seesaw. The position of a cart denotes the first degree of freedom, which is activated by a pneumatic proportional valve, and the angle of the seesaw indicates the second degree of freedom that is not actuated. Consequently, the proposed new pneumatic cart-seesaw system is straightforward to construct and direct to operate in different scenarios of performance. A state feedback controller is applied for stabilization of the equilibrium point of the system. Moreover, this study adds a supervisory controller that takes control action in extreme situations. Test results reveal excellent properties in control performance. The proposed product can be extensively applied in SAMS and pneumatic control for robotics control laboratory.

scholarly journals Improvement of the methodology of the tetrazolium test using different pretreatments in seeds of the genus Epidendrum (Orchidaceae)

2020 ◽  
Vol 42 ◽  
Author(s):  
Seir Antonio Salazar Mercado ◽  
Jesús David Quintero Caleño ◽  
Laura Yolima Moreno Rozo
Keyword(s):  
Deionized Water ◽  
Control Group ◽  
Distilled Water ◽  
In Vitro Germination ◽  
Test Results ◽  
Germination Test ◽  
Viability Test ◽  
Cloth Filter ◽  
Tetrazolium Test

Abstract: The aim of the present study was to determine the most suitable pretreatment to enhance the tetrazolium test in seeds of the Epidendrum genus. Initially, mature capsules were harvested at El Escorial village, in the municipality of Pamplona, Colombia. Subsequently, the seeds were subjected to five pretreatments: deionized water, 0.5% NaClO, 1.0% NaClO, 10.0% sucrose and a control group. Using the syringe method with cloth filter, the seeds were rinsed with distilled water and subjected to two concentrations of tetrazolium solution (0.25%, 1.0%) and three exposure times (6 h, 24 h and 48 h). Finally, the tetrazolium viability test results were correlated with the in vitro germination test. It was found that the use of deionized water improves the efficiency of the tetrazolium test in seeds of Epidendrum fimbriatum and E. microtum; as in seeds of E. elongatum when using 1.0% tetrazolium for 24 h. Similarly, a high correlation was found between viability and germination, using deionized water and 10.0% sucrose, with homogeneous results with each other.

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