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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 104 for “"Glass beads"”.
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Leaching of metals and metalloids from highway marking glass beads and the potential environmental impact
Glass beads are embedded in pavement markings to obtain retroreflectivity which plays a crucial role in the lighting-up effect needed for safe driving. Elevated metal and metalloid concentrations of As, Sb, and Pb have recently been observed in imported glass beads. The main objective of this …
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A comparative study of the use of plastic and glass beads in pavement lane marking
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science. Dept. of Civil Engineering, 1951
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The use of corn pollen and glass beads to estimate fine particulate organic matter retention
Corn pollen and glass beads were used as surrogates of natural fine particulate organic matter (FPOM). These particles were released into ten streams in three different physiographic regions, Appalachian Mountains, Rocky Mountains, and Central Plains, within the United States. Mean travel distance …
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Glass beads as indicators of contact and trade in Southern Africa ca. AD 900 - AD 1250
… in the form of archaeological collections of glass beads at sites throughout Africa and Southeast Asia. Thousands of beads have been found at Iron Age sites in the eastern Transvaal Lowveld and at inland sites along the Limpopo Valley and in Botswana. Similar looking types of beads, referred …
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Structure-property characterisation of ternary phase polypropylene composites
… containing ethylene-propylene rubber (EPR) and glass beads has been carried out. The composite structure was evaluated using various techniques including SEM, DSC, XRD and DMA. While the mechanical tests included tensile and impact measurements at ambient temperature, and a fracture toughness …
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Analysis of the single scatter albedo and imaginary index of refraction of fused silica nanospheres via a photoacoustic technique and a novel aerosol generator
… for aerosols containing solutions of water and glass beads, water and salt, pure isopropanol, pure methanol, methanol and beads, and methanol and salt.The average SSA for glass beads was found to be 0.9976 (+/- 0.0001) at 405nm, 0.9962 (+/- 0.0008) at 532nm, 0.9962 (+/- 0.0003) at 870nm, and …
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Fluid-filled helmet liner concept for protection against blast-induced traumatic brain injury
… Filler materials explored in this work are glass beads and glycerin. Experiments were performed at Purdue University and the University of Nebraska at Lincoln, using two different shock tube setups to produce incident blast waves. Peak transmitted pressure was used to assess filler …
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Osage Glass Bead Use: Archaeological and Ethnohistorical Evidence of Change and Continuity Through the Early Postcontact Era
… through a study of archaeologically recovered glass beads from four post-contact Osage sites in Missouri: the Brown, Plattner, Carrington, and Hayes sites. Contingency table analyses and diversity indices of the bead data are used to test two hypotheses generated by the cultural change …
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Benchtop testing of polyethylene passive sampling towards a quantitative analysis of volatile organic compounds (VOCs) in soil vapours
… model was setup, which consisted of a jar of glass beads or sand, containing a known mass of toluene as the compound of concern (COC). A beaker of water was placed in the physical model as a second form of measurement of toluene concentration in the air. The concentration of toluene in the air …
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The effects of fillers on the mechanical properties of polyester resin and a constrained optimization of filler content
… included clay, marble, nut shell flour, and glass beads and microspheres. Mechanical property data were generated for different filler concentrations and particle sizes. The properties tested were density, tensile strength, ultimate elongation, secant modulus, and flexural strength. Testing …
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Discrete particle transport in porous media : discrete observations of physical mechanisms influencing particle behavior
… from water saturated, mono-size 4mm diameter glass beads. Particle behavior as a function of pore fluid velocity and solid surface roughness was imaged at both the macroscopic and microscopic level. Experimental results revealed two interactions between the discrete particles and the solid …
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The Investigation of Primary and Secondary Modifiers in the Extraction and Separation of Neutral and Ionic Pharmaceutical Compounds with Pure and Modified Carbon Dioxide
… trapping capacities of three solid-phase traps (glass beads, 50/50 (w/w) glass beads/octadecylsilica), 50/50 (w/w) Porapak Q®/glass beads) were determined as a function of trap composition for a mixture of components varying in polarity and volatility. The Porapak Q®/glass beads mixture was found …
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Characteristics and modeling of the fracture properties of polymer-silica microparticulate composites via macroscopic scratch tests
… and theoretically. A wax mixture with spherical glass bead inclusions is developed as a model material. The hardness and fracture toughness of composites containing 0%, 5%, 10%, and 20% spherical glass bead inclusions by volume are analyzed using a built-in- house macroscopic scratch test device. …
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An experimental study of the effect of small particles on the fluid turbulence in fully developed flow of air in a horizontal pipe
… were performed in air containing spherical glass beads with a volume-mean diameter of approximately 45 $\mu$m and flowing with a mean centerline velocity between 17 and 24 m/s. The glass particles were able to respond to the most energetic turbulent disturbances in the fluid.
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Experimental investigation into lunar melt density and compressibility : the role of titanium
… and compressibility of four lunar picritic glasses as a function of TiO2 content from 0-11 GPa and 1748-2473 K (1475-2200°C). These glasses are hypothesized to have quenched rapidly as glass beads during lunar fire fountain eruptions. The lunar glass beads have distinctive colors that …
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ΚΑΘΑΡΙΣΜΟΣ ΚΑΙ ΜΕΛΕΤΗ ΙΔΙΟΤΗΤΩΝ ΜΙΑΣ Β-ΓΛΥΚΟΣΙΔΑΣΗΣ ΚΑΙ ΜΙΑΣ Β-ΓΑΛΑΚΤΟΣΙΔΑΣΗΣ ΑΠΟ ΣΠΕΡΜΑΤΑ ΚΡΙΘΑΡΙΟΥ. ΕΦΑΡΜΟΓΗ ΤΩΝ ΕΝΖΥΜΩΝ ΣΤΗΝ ΥΔΡΟΛΥΣΗ ...
… ON SEPHAROSE, ON RESIN (DUOLITE) AND ON POROUS GLASS BEADS WITH SIGNIFICANT CONSERVATION OF ITS ACTIVITY. THE SEPHAROSE IMMOBILIZED ENZYME ACQUIRED INCREASED THERMOSTABILITY.
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Mechanical characterization of jammable granular systems
… for jammed systems has not been reported. Glass beads of differing size distributions, silica blasting media, sand, and ground coffee were tested under different vacuum pressures in a procedure similar to an unconsolidated-undrained triaxial compression test for soils. Coffee was found to …
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Estimating the concentration of ultrasound contrast agents using ultrasonic backscatter in vitro
… the method were performed with both UCAs and glass bead microspheres in degassed water using a beaker setup and a flow system setup. Experimentally obtained estimates of the BSC were fit to ultrasound scattering models to extract concentration estimates of either the UCAs or the glass beads. …
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Formation and dissociation reaction rates and relevant kinetic behavior of propane gas hydrate (PGH)
… (g), water (l), PGH (s) and sediment particles (glass beads) (s). This work was carried out under the formation conditions of P = 0.427 MPa and T = 273.5 K, and under the dissociation conditions of P ≤ 0.168 MPa and T = 273.5 K.;A new designed, isothermal, and packed bed batch reactor was used …
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