Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 26 for “"tensiometer"”.
-
Improvements and reliability of MIT tensiometers and studies on soil moisture characteristic curves
… A digital laboratory balance and an MIT tensiometer, both monitored by a data acquisition computer, obtain continuous water content and soil suction data, respectively. As any other invention, advantages, disadvantages, and limitations of this device and technique need to be assessed and …
-
Transient Seepage Analysis for Levees and Dams: Numerical and Monitoring Approaches
… and Development Center located in Vicksburg, MS. Tensiometer and porous block sensors were used to monitor the pore water pressures in the embankments. It was found that when measuring the field soil water retention, tensiometers were more responsive than porous block sensors at low suctions; …
-
The effect of long term training on the bone mineral density and muscle strength of perimenopausal athletes
… arm flexors and leg extensors by a strain tensiometer connected to a strength chair. Differences between groups were determined by ANOVA followed by Scheffe Test and correlations by Pearson r. General characteristics, including age, height, weight and calcium intake showed no statistical …
-
THE EFFECTS OF WHOLE TREE HARVESTING ON SITE HYDROLOGY AND SOIL STRUCTURE AT BEDDGELERT FOREST, N. WALES, UK
… macropore flow was not observed at the site. Tensiometer results showed that the mineral soil remained unsaturated. Therefore, a type of preferential flow dominates at both sites. A one dimensional modelling approach to soil water movement confirmed that mesopores within the soil could conduct …
-
Hillslope and watershed scale hydrological processes and grazing management in a Dartmoor catchment, Southwest England
… the topsoil were obtained. At three locations, tensiometer nests were installed, recording soil suction at 10 cm depth intervals. At the catchment scale, stream discharge and rainfall were recorded. Grazing densities within the watershed were estimated and the observed patterns were related to …
-
Simple Techniques for the Implementation of the Mechanics of Unsaturated Soils into Engineering Practice
… using a pocket penetrometer and a conventional tensiometer. The suction values less than 300 kPa can be estimated using a strong relationship between the compressive strength measured using a pocket penetrometer and matric suction value. The high suction values in the range of 1,200 kPa to …
-
The validity of using grip strength to represent total body strength and of using a 1Rm bench press to represent upper body strength
… A load cell was used in place of the cable tensiometer used by Clarke. Each subject was also administered a grip strength test and a 1RM bench press test. Two criterion measures of strength were identified from the results of the isometric strength tests: (1) total body strength was defined …
-
Modeling the relation between suction, effective stress and shear strength in partially saturated granular media
… test setup was modified to accommodate an MIT Tensiometer as its pedestal. Materials consisting of uniform spherical glass beads were tested, under both saturated and unsaturated conditions, at conditions that matched those of the model.
-
Functional polymers for biomedical application : synthesis and applications
… properties measured on a Hounsfield Hti tensiometer. Interfacial synthesis was investigated as a synthetic route for the production of linear functional polyamides. High molecular weight polymer was obtained only when esterified diamino acids were condensed with aromatic diacid chlorides. …
-
Irrigation of acacia and eucalyptus species with waters of different salinities in a semi-arid environment in Formentera, Balearic Islands
… frequency were calculated by evaporation pan and tensiometer balance. No allowance other than winter rainfall (approximately 300mm) was made for leaching. Half the trees were watered for two seasons and half for four seasons. The experiment showed that these low demand species survived and grew …
-
Characterization of surfactant adsorption at a liquid-liquid interface by drop volume tensiometry
… mineral oil-water interface using a drop volume tensiometer. A model is developed to account for the neck formation in suspended drops under certain experimental conditions. The model relates apparent values of interfacial tension calculated from drops possessing necks to actual values. Dynamic …
-
Development of standard components for multi-degrees-of-freedom mems positioning stages with closed-loop feedback
… static and dynamic experiments including surface tensiometer application.
-
Synthesis and process optimization of colloidal unimolecular polymer, cup, particle formation, and its interfacial surface tension behavior
… nanoparticles using a maximum bubble pressure tensiometer. The equilibrium surface tension shows a dependence on concentration and the charge density of the CUP particle. The equilibrium surface tension becomes constant at higher concentrations due to the counterion condensation effect. The …
-
Force and Energy Measurement of Bubble-Particle Detachment
… using a hanging balance apparatus (KSV Sigma 70 tensiometer) and using a submerged hydrophobic plate in water. Three experiments were used; direct force measurement of bubble-particle detachment, detachment force and energy of a bubble from a submerged hydrophobic plate, and detachment force and …
-
Chemical Surface Modification of Polycarbonate to Increase Hydrophilicity
… taken using the sessile method on an optical tensiometer. Temperature, reaction time, concentration, solvent, and oxidation levels were varied to determine optimal reaction conditions. Using 0.01 wt% PPD at 80 ℃ for 2 hours, contact angles were reduced to 33°, but PPD dyed polycarbonate and …
-
Nitrogen and Phosphorus Management in the Mid-Atlantic
… in near average climactic seasons. Utilizing a tensiometer in a warmer and drier season than average protected against under-irrigation rates for fresh market tomatoes. Nitrogen applications ranging from 200 to 242 kg N ha-1 using a combination of a banded method, incorporation, and fertigation …
-
EXTENSIVE GREEN ROOF SUBSTRATE COMPOSITION: EFFECTS OF PHYSICAL PROPERTIES ON MATRIC POTENTIAL, HYDRAULIC CONDUCTIVITY, PLANT GROWTH, AND STORMWATER RETENTION IN THE MID-ATLANTIC.
… the high porosity of GR substrates resulted in tensiometer water column cavitation near -30kPa. Further studies with the same experimental substrates and OM ratios included both growth chamber studies to rigorously quantify the effects on plant growth and evapotranspiration and outdoor platform …
-
The mechanisms involved during the desaturation process of a porous matrix
… The technique required the development of a tensiometer capable of directly measuring the high negative pressures. Glass beads of narrow distribution provided insight into the behavior of the drying pendular rings. It was determined that the actual tension to initiate draining is much greater …
-
Role of salivary films in assessing astringent compounds
… were also completed on the pendant drop tensiometer to study the impact of these polyphenols on the development of the saliva film at the air/liquid interface where an elastic protein-rich matrix is formed.<br/>The mucosal pellicle is particularly mucin-rich with minimal levels, if any, …
-
INVESTIGATIONS OF PREFERENTIAL AND MATRIX FLOW IN A MOLE DRAINED SOIL BLOCK
… The edge was sealed using paraffin wax. Eight tensiometers and suction cup lysimeters were installed in each block together with fifteen pairs of time-domain reflectometry wave guides. A regular spacing pattern was employed so that spatial variations could be easily identified. Samples were …
Page 1 of 2