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.
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Showing 1 to 20 of 44 for “"light penetration"”.
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Experimental evaluation of near infrared light penetration into neural tissue
… both for diagnostic and treatment purposes. Penetration depth into the tissue is a critical parameter to be considered in these NIR laser applications. Published data on the optical properties of rodent neural tissue are rare, despite the frequent use of rats as animal models. The aim of this …
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Leaf area index, light penetration, and carbohydrate reserves during growth of Kentucky 31 tall fescue (Festuca arundinacea Schreb.)
… dry matter production, leaf area index (LAI), light penetration through the canopy and carbohydrate reserve fluctuations during regrowth under different growth stages and cutting managements of Kentucky 31 tall fescue were studied in three field experiments during spring and summer. Stages of …
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Herbicide Carryover to Cover Crops and Evaluation of Cover Crops for Annual Weed Control in Corn and Soybeans
… common ragweed and Palmer amaranth control and light penetration and two field experiments to determine the effects of cereal rye and wheat cover crop biomass terminated with a roller crimper or left standing on summer weed control and light penetration were conducted. For summer weed control, …
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Measurement of tissue optical properties during mechanical compression using swept source optical coherence tomography
… of cancers. Their effectiveness is limited by light penetration depth in tissue due to its highly scattering properties. The highly disordered refractive index distribution in tissue leads to multiple-scattering of incident light. It has been hypothesized that mechanical compression has a great …
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FACTORS INFLUENCING A PETAL-BASED FORECASTING SYSTEM FOR SCLEROTINIA STEM ROT OF CANOLA
… to canopy density,as indicated by percentage light penetration through the canopy, and increased as light penetration decreased. Higher disease incidence in the denser canopies was attributed to more favorable micro environmental conditions. A general pattern of increasing petal infestation …
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Growth Effects of Light and Plant Competition in a High Yield Environment (Soybeans; Zea Mays)
… were conducted to determine the effects of light in a high yield environment on corn Zea mays L.) yields and nutrient uptake, and to explain these effects based on changes in physiology, ontogeny, and physical characteristics. Strip intercropping was experimented with as a possible cultural …
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Variations of Physical and Chemical Parameters Within a Shallow Wind Influenced Lake
… water. Samples were tested for temperature, light penetration, turbidity, specific conductance, oxygen, alkalinity, hardness, nitrate, nitrite, ortho-phosphate, and pH. Chemical tests were performed with a Hach DrEL (Engineers Portable Water Testing Laboratory). Findings. The lake was found …
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NIR technologies for high speed fruit grading
… grading of fruit, the second with the NIR light penetration and distribution within a fruit. A ‘rotary grader’ has been built to enable the rapid, non-destructive assessment of fruit. Up to twenty fruit can be placed on a rotating disk, which can be spun at a controlled speed or moved to …
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A system for optimizing interior daylight distribution using reflective Venetian blinds with independent blind angle control
… angle control is developed to optimize the daylighting performance of a system of reflective Venetian blinds. Numerical modeling and experiment confirm that independent control of alternating blinds yields adequate visual comfort and daylight distribution to a distance of 10 m from the window …
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FLEXIBLE GEL IMPLANT LOADED WITH PERSISTENT LUMINESCE NANOPARTICLES FOR PHOTOTHERAPY IN DEEP TISSUES
… an effective medical treatment using light with minimal side effects, is limited for deep-seated diseases due to low UV and visible light penetration (1-3 mm). While X-rays penetrate deeper, their direct use in phototherapy is challenging for optogenetic and photodynamic therapies, as …
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The effect of catchment land use on sediment input to Swartvlei
… geological survey maps and aerial photographs. Flights over the area enabled confirmation of observations. Informal interviews with persons involved in catchment management, property-owners and roads authorities were conducted. Areas of accelerated sediment loss were determined and the magnitude …
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Photocatalytic Reactor using TiO2 Thin Film on Quartz Tubes
… using TiO2 slurry and thin film, using a UV light source, the constraints for these reactors are the need for the removal of TiO2 particles at the outlet stream in a slurry reactor and poor environment for the efficient use of TiO2 film using UV light, as the UV light penetration depth in …
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Cover crop programs, termination methods and timings, and suppression mechanisms on weed growth and competition
… did not affect weed suppression consistently. Light penetration data also showed that greater CC biomass led to a decrease in light penetration through the CC canopy, which could be a factor in reducing Palmer amaranth emergence particularly at the greater CC biomass accumulation levels. …
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Behavior of Light in a Photobioreactor and Design of Light Guides
… in a photobioreactor system; demonstrate the light activity in a flat-plate photobioreactor; and design the light channeling system. Generally, microalgae are cultivated in open ponds and in closed photobioreactor systems. In open ponds, the productivity of microalgal biomass is very low, due …
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Characterizing vegetation structure using waveform LiDAR
The structure of light penetration through the canopy plays an important role in water, carbon, and energy fluxes between the biosphere and the atmosphere. Total foliage and foliage distribution are major aspects of canopy structure that significantly influence light and vegetation interaction. …
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Canopy, microenvironment, and nitrogen effects on summer recovery of tall fescue
… heights with a seventh unmowed check. Canopy light regimes, leaf area index, and regrowth of tillers were monitored along with soil, fair, and shoot temperatures in stubbles after the June harvest. Mowing more frequently in spring decreased canopy yields of the June harvest, but increased leaf …
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A productivity study on Smith Mountain Lake
… algae, bacteria, specific conductance, light and primary productivity. The effect of each of these parameters on the trophic levels in the reservoirs was studied. The results of this investigation showed that the inflow of the nutrient rich Roanoke River had caused eutrophic conditions …
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Savanna Restoration Through Prescribed Fire: Demographic and Physiological Responses of Oak and Hickory Seedlings and Saplings to a Changing Light Environment
… spp.). Following prescribed burns, canopy light penetration was significantly greater in burned forest sites than in unburned forest sites. Density, basal area, mortality, and recruitment appear to be increasing in burned forest sites relative to unburned forest sites. Maximum and ambient …
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Genotypic and Environmental Effects on Soybean Canopy Photosynthesis
… taken in this study suggests that increased light penetration into the chlorophyll-deficient canopies was the cause of the observed phenomenon. In the second study, the afternoon decline in CER in crop canopies at similar light levels as compared to the morning was investigated using grain …
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Murky waters: discerning among sources of natural variation under high uncertainty and at multiple scales
… previous findings that lake size, depth, and light penetration are dominant physical controls on allochthony, but add that it sharply declines at high elevation due to changes in terrestrial primary production near or above tree line. I also found that primarily rain-fed rivers undergo large …
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