The objective of these studies was to observe the effects of LED lighting treatments on physiological parameters of lettuce and microgreens. Four different lighting treatments; 1) Physiospec (white), 2) Red, 3) DR9 (25:75 Blue:Red), and 4) Anthospec (at 20/80 Blue:Red); were used in this experiment. Two experiments were conducted: 1) Examining the effects of LED lights on lettuce yield and photosynthetic activity and 2) The effects of switching lighting regiments halfway through the growth cycle on Kale microgreen yield and color. Physiospec lighting was found to promote the highest yield and photosynthetic activity among the four treatments for lettuce. It was found that changing from Physiospec lighting to Red lighting increased the fresh mass and stem height of kale microgreens. This also made the microgreens alighter shade of green.

This thesis began with an interest in apartment housing typology. I am familiar with this typology, yet it remains mysterious. The topic was never touched on in five years of architectural education or the time spent working in firms. I felt the need to study this typology. It is through the repetition of working with the realization that the hand and mind are one; I understand what I am working toward and the hand informs the mind of what it is doing. The notion of centralization, transparency, spatial ambiguity, symmetry, dematerialization, are used as a method to organize space and architectural elements. Spatial orders and conditions are examined through the use of idealized color. This work is the result of a year long study of the above architectural vocabulary. It is my hope that through this study, I can begin to establish a point of view. This thesis is a cross section of a thought. / Master of Architecture

Two experiments were conducted to determine the influence of light on 'Norman' and 'Cresthaven' peach fruit quality characteristics. Of primary interest was the relationship between ground color and flesh firmness. Light levels were manipulated by use of shade cloth, reflective mulch, and aluminum foil. 'Norman' trees, with a randomly chosen half of the canopy covered with 73% shade cloth, had fruit with lower levels of red color, soluble solids concentration (SSC), specific leaf weight, and average photosynthetic photon flux (PPF) than did non-shaded trees. Foil-covered 'Cresthaven' fruit were larger, less firm, and had lower SSC than non-covered fruit. Covered fruit developed yellow but not red color. Position of the fruit within the canopy of the tree also affected fruit quality characteristics. Inside fruit on both 'Norman' and 'Cresthaven' trees were smaller and firmer, had lower SSC, and were less red than fruit from the canopy exterior. The position effect was probably due to the degree of light exposure and not to the distance from the roots. Fruit on the inside of the tree canopies received much lower average PPF than outside fruit. Relationships were evaluated between ground color and firmness for both cultivars. At a given hue angle, fruit developing in high-light environments were firmer than fruit from low-light environments for 'Cresthaven', but the opposite was true for 'Norman'. Therefore, canopy position or the light environment in the vicinity of the developing fruit does not consistently influence the relationship between hue angle on the non-blush side of the fruit, and flesh firmness. / Master of Science

This thesis is my answer to the following question: What is a good building? I believe that a good building must have the moments that can touch people. It should have some spiritual qualities. These moments can be achieved by form, meterial, light, details, and color. / Master of Architecture

Through the investigation of indirect light, reflected color, and geometric construction, and by the awareness and understanding of what allows for experiences that engage the human emotion, this thesis offers a project which has the power and presence to move the soul. / Master of Architecture

This study investigates the effects of clustering or format of presentation (categorized and uncategorized lists), level of color realism of graphics (color pictures, black and white pictures and line drawings), and age (10 year old, 16 year old and adults) on the pictorial recall memory among students in Malaysia. Three hundred sixty students of three age groups were randomly assigned to one of the six stimulus treatments (categorized color, uncategorized color, categorized black and white, uncategorized black and white, categorized line drawing, and uncategorized line drawing). There was a significant interaction effect between age and cluster, F (2, 342) = 9.07, p < 0.0001). Simple main effects test shows that among 10-year olds, significant difference exists between the mean recall of pictures in categorized lists and uncategorized lists. More pictures in the categorized lists were recalled than in the uncategorized ones. However, the mean recall of pictures between the categorized and uncategorized lists among 16-year olds and adults did not differ significantly. Interaction between age and color realism was also significant, F (4, 342) = 2.93, p < 0.021). Simple main effects test indicates that among 10-year olds and adults, the mean number of items recalled differed significantly under each level of color realism. Pairwise comparison shows that among 10-year olds and adults, color pictures were recalled significantly better than both black and white pictures and line drawings. The mean number of items recalled between black and white pictures and line drawings however, was not significantly different. It was concluded that color pictures or illustrations are recalled better than black and white pictures and line drawings, and that categorized lists of pictures are recalled better than the uncategorized lists. / Ph. D.

If the theories of Piaget (stages of cognitive development) and Bruner (anything can be taught to anyone as long as it is taught in their language) are combined and applied to an elementary school the resulting conclusion is very quickly hands-on learning. Or, more simply, elementary-aged children understand their world through tangible experiences, so teach them through tangible experiences. A child's early memory code is formed by concrete experiences (combinations of the 5 senses), but these experiences become the building blocks for their later abstract cognitive thought patterns. This theory of education is widely applied from the standpoint of teach (hands on lessons, manipulative, etc.), but is a low if not nonexistent priority in constructing the environments in our schools. The experiential aspects of our schools should not only provide for a purely more pleasing environment, but should also allow for strong behavioral imprinting experiences that would result in memory niches -- the foundation for later abstract cognitive thought patterns. This diagram shows the progression of memory coding through these stages and how the resulting thoughts would be accessed. / Master of Architecture

Phosphates are used by drinking water utilities to 1) reduce iron/manganese aesthetic problems by sequestration, 2) inhibit calcium carbonate scale formation via threshold inhibition, and 3) reduce corrosion of pipes by forming protective pipe scales. Orthophosphates can control lead, copper and iron corrosion through the formation of durable, low solubility scale, but are widely believed ineffective for sequestration or anti-scaling. Conversely, polyphosphates are effective sequestrants and anti-scalants, but can increase corrosion of plumbing materials. Here, we first critically reviewed the current state of the science, operational guidance, and knowledge gaps related to use of orthophosphate and polyphosphates for all three objectives. Three major gaps in understanding were identified and then addressed in subsequent chapters: 1) use of phosphates to achieve both sequestration and anti-scaling 2) mechanisms of iron sequestration, and 3) stabilization of magnesium silicate scale linings in a distribution system. In the critical review, we holistically conceptualize phosphate use as a three-dimensional (3-D) challenge of optimizing sequestration, anti-scaling and corrosion control. Despite nearly a century of widespread use, there is a poor scientific and practical understanding of how to use phosphates to achieve each of these key objectives, much less achieve synergies and avoid antagonistic effects. Many water systems are reliant on trial-and-error methods, or guidance from vendors of these proprietary chemicals, creating potential inefficiencies or even adverse unintended consequences. Effective sequestration of iron and manganese, to prevent formation of visible discoloration, can occur through four possible mechanisms which are undoubtedly dependent on the water chemistry (e.g., pH, hardness, redox). Anti-scaling of calcium carbonate occurs through threshold inhibition and crystal distortion, but sometimes phosphates can encourage scaling due to the precipitation of calcium phosphate. Corrosion control via orthophosphate is often effective, but polyphosphates can sometimes increase lead or copper levels in drinking water. Despite their widespread use in scientific studies, it was discovered that standardized measurements of color and turbidity do not fully account for the range of subjective consumer observations regarding cloudy or discolored water. At a constant apparent color of 110 Pt-Co, testing illustrated that relatively non-offensive air bubbles had a high turbidity of 74 NTU compared to just 0.1 NTU for offensively orange fulvic acid. Additionally, factors such as background color, type of light source, and direction of light significantly influenced perception of discolored water. For instance, under typical laboratory lighting conditions (light from above) with a white background, colors caused by iron, manganese, and fulvic acid were very prominent, whereas white calcium carbonate and magnesium silicate particles were more challenging to see. But white particles became much more prominent when the light source was from below or there was a darker background. A study of Fe sequestration was conducted to elucidate a mechanistic basis for the empirical trends revealed in the utility field study. As revealed in the literature review, polyphosphates could sequester Fe by inhibiting any step of the reaction sequence Fe2+ oxidation  precipitation of Fe(OH)3  particle agglomeration to visible sizes. Phosphates generally inhibited Fe2+ oxidation above about pH 7-8, dependent on chain length, and catalyzed oxidation at lower pHs. But in oxygenated waters above about pH 7, the dominant mechanism of sequestration was some combination of Fe3+ complexation and colloid stabilization at small particle sizes that were practically invisible. Increasing the phosphate chain length, phosphate concentration, and Si concentration caused more effective Fe sequestration, whereas Ca, Mg, and increased pH hindered its effectiveness. It was also discovered that orthophosphate can be an effective sequestrant under ideal conditions, polyphosphate can sequester more than 1 mg/L Fe despite some claims to the contrary, and Ca at very high doses can precipitate polyphosphates. During this dissertation work, a novel, thick (~1 mm), glassy magnesium silicate (MgSi) scale was discovered covering much of the pipe surfaces in a large water distribution system. This MgSi lining was hypothesized to be an extremely effective means of corrosion control that was important to maintain in its present state, as dissolution could cause it to detach from pipes, whereas further precipitation could clog them. To better understand how to maintain the scale, factors affecting the formation and dissolution of the MgSi solid were examined. Phosphate corrosion inhibitors had little effect on MgSi solubility at pH 8.5 and 10, while hexametaphosphate (HMP) and zinc orthophosphate slightly reduced Mg and Si dissolution rates at pH 7. Zinc orthophosphate reduced Mg dissolution by 50% and completely inhibited Si dissolution from the solid, while HMP decreased dissolution of Mg by 32% and Si by 63%. The magnesium silicate did not precipitate below pH 10 without the presence of a pre-existing seed solid. With a pre-existing seed scale, however, the MgSi further precipitated at a pH 8.5-9 in one source water and 7.5-8 in another. Below these pH levels, scale dissolution was shown to occur. Strategies were evaluated to help identify the equilibration pH for operation of a system with varying concentrations of silica, magnesium and pH. The two-dimensional (2-D) interplay of polyphosphate use for sequestration and anti-scaling was investigated for nine small utilities who rely on groundwater in North Carolina. Bench-top testing methods were developed to determine the 'optimal phosphate doses,' defined here as the lowest level of polyphosphate that maintains visually clear water and acceptable levels of scale formation. One proprietary polyphosphate chemical had an optimal sequestrant dose that depends on the concentration of Fe, Mn, Ca, and Mg. The dose (in mg/L as P) is equal to 58.5[Fe] + 59.7[Mn] + 0.041[Ca + Mg] + 0.4669 (units mM). Interestingly, color was well correlated with particulate (> 0.45 μm) Mn (R2 = 0.79) while turbidity was mostly correlated with particulate iron (R2 = 0.60). Furthermore, neither color nor turbidity measurements were reliable predictors of discoloration detected by eye. In the three utilities with higher hardness (> 100 mg/L as CaCO3), at least 3.6X more phosphate was needed for Fe and Mn sequestration than scale inhibition. But lab testing in very hard water with 300 mg/L as CaCO3 demonstrated that achieving anti-scaling, will sometimes require more polyphosphate than that needed for control of sequestration. Overall, this dissertation advances understanding of phosphate use in relation to important problems arising in water distribution or buildings. The innovative practical testing methods, improved practical understanding, and mechanistic insights can be applied to maximized the benefits of phosphates use while avoiding detriments. This is an important first step towards developing a rational holistic framework to guide utility decision-making regarding phosphate use. / Doctor of Philosophy / Phosphates are safe chemicals dosed to drinking water for a variety of objectives. Phosphates can prevent black water caused by manganese, red water caused by iron, clogging of pipes by precipitation of CaCO3, and to control corrosion of lead, copper and iron pipes. The simplest and least expensive phosphate is orthophosphate. Several orthophosphate molecules can be joined together to form a chain of 2 phosphates (pyrophosphate), a chain of 3 phosphates (tripolyphosphates), and chains up to 100s of phosphates in length. Some utilities only use orthophosphate to control pipe corrosion, and orthophosphate is not believed to be very effective for sequestration or anti-scaling. Conversely, polyphosphates can reduce red and black water from iron/manganese discoloration, and also inhibit the formation of calcium carbonate scale, but they sometimes increase corrosion of plumbing materials. Here, we review the current state of the science, operational guidance, and knowledge gaps related to use of ortho- and poly-phosphates. Three major gaps in understanding were identified and then addressed in subsequent chapters: 1) use of phosphates to achieve sequestration and anti-scaling simultaneously, 2) improve our understanding of how phosphates stop iron and red water (i.e., sequestration), and 3) stabilization of magnesium silicate scale linings in a distribution system. In a critical review, the use of phosphate for sequestration, anti-scaling and corrosion control was comprehensively examined. Despite nearly a century of widespread use, there is little understanding of how to properly use phosphates to achieve each objective. For dosing, many water systems rely on trial-and-error methods or guidance from chemical vendors, which could lead to mistakes that cause harmful unintended consequences. This could include elevated lead and copper release at the consumer's tap, increased consumer complaints caused by aesthetically displeasing water, increased head loss in pipes, and staining of dishes and appliances. Despite their widespread use in scientific literature, traditional measurements of color and turbidity are not always perfect measures of what is seen by eye. Additionally, factors such as background color, type of light source, and direction of light significantly influence the visual properties of water. For instance, under typical laboratory lighting conditions (light from above) with a white background, colors caused by iron, manganese, and fulvic acid were most noticeable, whereas white calcium carbonate and magnesium silicate particles were more challenging to see. In contrast, all particles became more observable when the light source was positioned below. A study of iron sequestration was conducted to investigate the ability of different phosphates to reduce the formation of red-colored water. As revealed in the literature review, polyphosphates could sequester iron in 3 different ways, but experiments revealed only two would be important in waters with higher pH and oxygen. Increasing the phosphate chain length, phosphate concentration, and silica concentration caused less visual discoloration, whereas calcium, magnesium, and increased pH had the opposite effect. It was also discovered that, at very high doses of calcium, a calcium-polyphosphate solid can precipitate. During this work, we also discovered a magnesium silicate (MgSi) scale covering much of the pipe surfaces in a large water distribution system. This MgSi lining is believed to protect underlying pipe materials from corrosion. To maintain the benefits of this protective scale, factors influencing its formation or dissolution were tested. The MgSi precipitated above pH 8.5-9 in one source water and 7.5-8 in another if a seed of the scale was present. Below this pH, the scale dissolved. The dosing of some phosphates slightly reduced the amount of scale which dissolved at a lower pH, but had no influence over the formation of more scale at higher pHs. Strategies were then evaluated to help the utility identify a good pH to operate the system, and to maintain the MgSi scale. The use of polyphosphate for sequestration and anti-scaling was investigated for nine small groundwater utilities in North Carolina. Laboratory experiments were conducted to determine the lowest level of polyphosphate that maintains visually clear water and acceptable levels of scale formation. This 'optimal polyphosphate dose' could be predicted by the iron, manganese, magnesium, and calcium concentrations of the water, at least for the utilities tested. Even in the three utilities with highest hardness in the study, more phosphate was needed for sequestration than inhibiting the formation of calcium carbonate scale. But lab testing in another very hard water with 300 mg/L as CaCO3, did demonstrate anti-scaling will sometimes require more polyphosphate than that required for sequestration. Overall, this dissertation advances understanding of phosphate use and abuse in relation to important problems arising in water distribution or buildings. The testing methods and improved practical understanding will help maximize the benefits of phosphates while avoiding detriments. This is an important first step towards developing a framework to guide utility decision-making regarding phosphate use for the benefit of consumers.

The relationship between the changes in color values of scenic landscapes, and the corresponding shifts in viewers' preferences to those changed environments, was the focus of the presented research. Color modifications, either natural or based on some human intervention, provide visual clues that an environment has undergone some transformation. These color changes can occur at both the micro and macro scale, can having temporal dimensions, and can be a result of combinations of both physical landscape change, and shifts in an observer's perspective with respect to that landscape. The research reviewed two existing models and related them in an integrated program of scenic change analysis. The first, a bio-physical remote sensing model, identified the relationships between the existing bio-physical environmental conditions and measured color signatures of selected landscape features. The second, a psychophysical perception model, established relationships between the landscape's bio-physical attributes and measured perceptual responses to those environments. By merging aspects of each model, the research related the changing scenic color patterns with observers' responses to those changed environments. The research methodology presented a program of scenic change analysis incorporating several technologies including (1) ground-based biological inventories, (2) remote sensing, (3) geographic information systems (GIS), and (4) computer visualization. A series of investigations focused on landscape scenes selected from a high elevation coniferous forest in southern Utah. Three initial scenic investigations compared (1) the impact of changing view angles on scenic color values, (2) color shifts due to changing sun-illumination angles within a day, and (3) color shifts due to changing biological conditions over a 12-month period. A fourth investigation measured the color changes caused by a spruce bark beetle outbreak, and developed a series of color signatures to simulate the color shifts indicative of an outbreak at different stages of development. These signatures were applied to digitized site photographs to produce a series of visualizations displaying different levels of beetle damage. The visualizations were then applied in a series of perceptual experiments to test the precision and reliability of the visual simulations.

La cryptographie visuelle consiste à partager entre plusieurs « Shadow Images » (SIs) un secret qui ne se révèlera à l'oeil de l'observateur qu'à leur superposition. Depuis les travaux de Naor et Shamir, ce procédé cryptographique a été étendu à Des schémas numériques variés, adaptés à diverses problématiques. En revanche, les travaux concernant son implémentation physique sont peu nombreux à ce jour. Cette thèse est consacrée à l'implémentation de la cryptographie visuelle sur des SIs imprimés en demi-tons en vue de l'authentification de documents. Le SI associé au document peut être imprimé sur support opaque ou transparent, les autres SIs étant imprimés sur films transparents. Nous avons résolu la difficulté de leur superposition par une méthode de Fourier permettant le recalage de la structure quasi-périodique d'un SI. La précision de cette méthode nous a permis de développer un système optique de superposition par projection. On verra que les phénomènes physiques responsables du rendu visuel de SIs superposés sont propices à une protection contre la copie illicite du SI associé à un document. La complexité de ces phénomènes et leur dépendance au type d'impression imposent une modélisation physique pour obtenir un rendu précis. Cette approche nous a conduit à considérer la problématique de la reproduction des couleurs et à développer des modèles spectraux adaptés à la superposition de supports imprimés non diffusants et/ou diffusants, en réflexion et en transmission. La précision de ces modèles prédictifs est tout à fait satisfaisante au regard de celle habituellement obtenue dans le domaine de la reproduction des couleurs. Cela nous a permis d'introduire une approche originale de la cryptographie visuelle par ajustement de couleur (color matching) : une même couleur, à une tolérance près basée sur la vision humaine, est générée par différents demi-tons imprimés sur les supports à superposer. La couleur du message peut ainsi constituer un secret partagé entre les SIs de la même façon que l'est le contenu du message. Chaque SI pris individuellement ne laisse fuir aucune information sur la couleur du message, qui ne sera révélée qu'à leur superposition. Cela peut permettre de prévenir une attaque par falsification du SI associé au document (cheating attack ). De plus, le rendu des couleurs étant très dépendant du système d'impression utilisé, une reproduction fidèle à partir d'un système d'impression différent est difficile. La difficulté peut être encore accrue par l'utilisation de caractéristiques d'impression non standard / In this thesis, we will focus on the physical implementation of visual cryptography, which consists in sharing a secret message between several unmeaning images, so-called shadow images, at least one of them being printed. By the principle of the method, no information leaks about the message until the images are properly stacked together. As the alignment of the shadow images hampers the deployment of the visual cryptography in practice, we develop a dedicated image registration method. In contrast with existing methods, ours is not intrusive. We make use of the particular shape of the elementary constituents of the shadow images, the shares, to extract in the Fourier domain the main parameters of the geometrical transformations occurring between the superposed images. We prove that this method allows subpixel accuracy in shadow images registration. We benefit from such ability by implementing visual cryptography in an image projection configuration : the digital shadow image is projected onto the printed one. In this way, the registration is performed automatically by using a digital camera (the resulting superposition being observable by the eye). For the purpose of authentication, one has to deal with specific attacks: the shadow image attached to a given document could be tampered with or copied. In order to prevent such attacks, we have increased the di_culty to reproduce the shadow image by considering color. This approach requires a complete management of colors. Thanks to recent advances in color reproduction, we are able to predict the reflectance and transmittance spectra of supports printed in color. In this thesis, we develop new spectral prediction models namely for piles of printed transparencies as well as for transparencies stacked onto papers, all printed in color. Thus, we are able to predict the color of each share in a shadow image to be printed and to achieve color matching i.e. we are able to reach a color by various combinations of superposed colors. Such a prediction allowed us to introduce a new approach in visual cryptography: color matching when revealing the secret message to be shared into two (or more) shadow images, in order to authenticate the shadow images provider. As the prediction models are sensitive to the calibration of the printing system (printer, inks, supports, halftoning and geometry measurement conditions), the use of special materials will increase the di_culty to generate visually acceptable fake pairs of shadow images