2 pp. / This fact sheet briefly describes the research protocol of the Hopi reservation.

5 pp. / This fact sheet describes describes the socioeconomic and cultural aspects of the Navajo reservation, as well as the history of extension and effective extension programs and collaborations conducted on this reservation.

2 pp. / This fact sheet describes research and research protocol with audiences on the Navajo reservation.

There are two main hypotheses examined in the dissertation. The first is that the physiology of the hand provides motivation for the claim that sign language handshapes can be considered easy, hard or even impossible to articulate. The second hypothesis is that easy handshapes occur more often than expected, hard handshapes occur less often than expected and impossible handshapes don't occur at all within a single sign language. These hypotheses are examined in the following ways: first, I provide a detailed explanation of the physiology of the hand from which I conclude that not all fingers are equal in skill and not all configurations a hand may assume are equally easy. Second, based on the physiology, I propose a metric for determining which handshapes are "easy" and which are "difficult". Third, I examine whether the "easy" handshapes occur more often than expected, while the "hard" handshapes occur less often than expected in the signs of two languages, American Sign Language (ASL) and Taiwan Sign Language (TSL). I conclude that the hypothesis that the "easy" handshapes occur more often than expected and the "hard" handshapes occur less often than expected is supported in approximately half of the cases.

CIVINS / This project is concerned with evaluation of the merits of competing technological concepts and managing the R&D investments needed to bring them to fruition. A weakness of the current R&D process is that arguments regarding who should receive funding come from a concept's proponents, who are usually interested and biased. More objective evaluation methods are needed. As part of this work it is important to understand better how qualified experts evaluate technological concepts. Can a probabilistically formulated method of integrating knowledge of various performance attributes provide better understanding of the likely performance of a technological concept? This is the question of interest. / CIVINS

Doctor of Philosophy / Department of Family Studies and Human Services / Jared R. Anderson / Parental school involvement is associated with positive social, psychological, and academic child outcomes. Beyond school, demographic, and individual influences, research is limited regarding the link between family-level processes and parental school involvement. Guided by family systems theory, this study used data from the Fragile Families and Child Wellbeing Study (n = 1,896) to examine the link between coparenting support and mothers’ and fathers’ home-based school involvement and school-based school involvement when the child was nine years-old. Additionally, this study tested if parental union transitions (e.g., parental union dissolution; parental union formation; stably coresident relationship) significantly moderated these relationships. Latent variable structural equation modeling results revealed that higher levels of coparenting support was associated with higher levels of mothers’ and fathers’ home-based school involvement, and higher levels of mothers’ and fathers’ school-based involvement. Union transition was not a significant moderator between coparenting support and mother and father home- and school-based school involvement.

M.Com. / Please refer to full text to view abstract

A project report submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg in partial fulfilment of the requirements for the Degree of Master of Science in Engineering. / A hydrochlorination facility was developed for tile processing of refinery precious metal residue materials on the laboratory and pilot scale. Hazard elements were identified and evaluated using an Event Tree Analysis. An exponential technique was applied to estimate the cost of the proposed production hydrochlorination facility. The estimated cost was R120 000. The Expected Present Value Ratio was +190 which indicated satisfactory project economics. The reactor material for the pilot scale unit was selected using a weighted values quantitative material selection procedure. Stainless steel Type 316L and Type 310 were selected. Failure of the Type 516L reactor occurred after 40 hours service. The mode of failure was extensive surface scaling which was attributed to the hydrogen chloride, sulphide gases and 1 000 °c operating envirornment. Subject to certain provisions it would be feasible to commission a safe and profitable production hydrochlorination facility. The consumable reactor concept was based on its replacement after 40 hours service. This was justifiable because of the high value of the material and the saving in down-stream processing costs. / Andrew Chakane 2018

BRANCH OF AERONAUTICAL ENGINEERING UNIVERSITY OF THE WITWATERSRAND / An experimental investigation was carried out on a half scale model of a helicopter COmbined Infra-Red Suppression and Tail rotor Elimination (CIRSTEL) system to characterise its performance in terms of power consumption, thrust, pressure drops and temperature reduction. The model consists of a Circulation Control Tail Boom and Thruster (CCTB&T) with the hot engine gasses ducted into the tail boom where they are mixed with ambiant air supplied by a fan situated in the body of the helicopter. The CCTB&T replaces the conventional tail rotor on a helicopter and supplies the torque to counter-act the torque applied to the main rotor. The model was tested using both hot and cold air to simulate the flow of hot engine gasses. The performance is defined in terms of thrust, power, and mass flow coefffcients which were found to be constant for the configuration tested. It was shown that the power requirements of the fan are significantly reduced by introducing the hot engine gasses into the tail Boom. The temperature of the hot engine gasses is also reduced from 450°C to approximately 200°C The surface temperature of the model was found to be less than 55'C of the configuration.

本论文主要研究了各种可见光光催化剂的合成。包括了Cu₂S，CuO/ZnO复合物以及钒酸根掺杂的磷酸银材料。论文讨论了这些光催化剂的性质与光催化活性，机理同应用也在本文中进行了探讨。 / 首先，发现并合成了硫化亚铜十四面体纳米粒子。研究中发现三正辛基膦对硫化亚铜多面体的形成是必需的。得到的硫化亚铜多面体具有暴露的罕见的面。通过对其光电活性的研究发现，相对于常见的硫化亚铜六边形片状纳米粒子，这种多面体具有5倍以上的活性。 / 其次，异质结构的CuO/ZnO复合材料通过光化学沉积合成。在这两种半导体的接触面形成了p-n结，促进了电子在两者间的传递。在荧光谱图中发现，因电子空穴淬灭引发的荧光峰消失了。这代表由于异质节的形成电荷分离的效率大大提高，从而光催化的效率也得到了很好的提高。 / 最后，含氧根离子作为一种新型的掺杂材料被用于提高磷酸银的性质。磷酸银光解水的能力经过掺杂后得到了显著提高。同时，其在可见光下的稳定性也获得了很大的提高。含氧根离子掺杂物对于磷酸银材料的性质改变及机理在文中都进行了探讨。 / This thesis focuses primarily on the development of visible-light-driven photocatalysts. These include Cu₂S, CuO/ZnO composites and vanadate doped Ag₃PO₄. The property and activity of the materials were studied. The application and mechanism of the enhancement were also explored. / Firstly, 14-facet polyhedra Chalcocite Cu₂S Nanocrystals were synthesized utilizing solvothermal method. It was found that the presence of trio-n-octylphosphine was essential for the exposure of unconventional faces. Studies of the photoelectrochemical performance have indicated that the polyhedra bounded by facets exhibit much higher activities than Cu₂S hexagonal plates with only facets. / Secondly, a heterostructure of CuO/ZnO was fabricated via photochemical deposition. The formation of p-n junction improved the visible light absorption property of ZnO. Photoluminescence spectra showed diminished peaks caused by recombination of excited electrons and holes in the semiconductor which demonstrated that the heterostructure facilitated the charge separation and thus enhanced the photocatalytic activity. / Thirdly, an oxoanion doping method was employed to improve the properties of Ag₃PO₄. The water oxidation ability was found to be higher than the pure Ag₃PO₄. The doping method was proven to be effective in both improving activity and durability. The mechanism of the doping method was also discussed. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Li, Yecheng. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2012. / Includes bibliographical references (leaves 71-77). / Abstracts also in Chinese. / Abstract (Chinese) --- p.i / Abstract --- p.ii / Acknowledgement --- p.iii / List of Figures --- p.v / Table of Contents --- p.viii / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1. --- Basic Principles of Photocatalysis --- p.1 / Chapter 1.2. --- Strategies to Develop Visible-light-driven Photocatalysts --- p.4 / Chapter 1.2.1. --- Native visible-light-driven photocatalysts --- p.4 / Chapter 1.2.2. --- Ion substitution (doping) --- p.6 / Chapter 1.2.3. --- Solid solution photocatalysts --- p.10 / Chapter 1.2.4. --- Dye sensitization to harvest visible light --- p.13 / Chapter 1.3. --- Strategies to Enhance Photocatalytic Activity --- p.15 / Chapter 1.3.1. --- Interface engineering --- p.15 / Chapter 1.3.2. --- Band gap engineering (Tuning distribution of dopants) --- p.17 / Chapter 1.3.3. --- Crystal structure and morphology engineering --- p.19 / Chapter 1.3.4. --- Cocatalyst loading --- p.23 / Chapter 1.4. --- Summary --- p.25 / Chapter 1.5. --- Objective of the Thesis --- p.25 / Chapter Chapter 2 --- Facet Effect of Copper(I) Sulfide Nanocrystals on Photoelectrochemical Properties --- p.28 / Chapter 2.1. --- Introduction --- p.28 / Chapter 2.2. --- Experimental --- p.30 / Chapter 2.2.1. --- Synthesis --- p.30 / Chapter 2.2.2. --- Characterization --- p.30 / Chapter 2.2.3. --- Photoelectrochemical performance analysis --- p.31 / Chapter 2.3. --- Results and Discussion --- p.32 / Chapter 2.4. --- Conclusions --- p.40 / Chapter Chapter 3 --- CuO-ZnO Composites for Enhanced Photoelectrochemical Performance --- p.41 / Chapter 3.1. --- Introduction --- p.41 / Chapter 3.2. --- Experimental --- p.42 / Chapter 3.2.1. --- Synthesis --- p.42 / Chapter 3.2.2. --- Characterization --- p.43 / Chapter 3.2.3. --- Photoelectrochemical performance analysis --- p.44 / Chapter 3.3. --- Results and Discussion --- p.45 / Chapter 3.4. --- Conclusions --- p.56 / Chapter Chapter 4 --- Vanadate Doped Ag₃PO₄ and Its Enhanced Photoactivity and Durability --- p.57 / Chapter 4.1. --- Introduction --- p.57 / Chapter 4.2. --- Experimental --- p.59 / Chapter 4.2.1. --- Synthesis --- p.59 / Chapter 4.2.2. --- Characterization --- p.59 / Chapter 4.2.3. --- Oxygen evolution tests --- p.60 / Chapter 4.3. --- Results and Discussion --- p.61 / Chapter 4.4. --- Conclusions --- p.68 / Chapter Chapter 5 --- Summary --- p.69 / Reference --- p.71