The design of a 3D printing facility in Central, Port Elizabeth

High-tech architecture is moving towards a paradigm shift with the development and incorporation of digital fabrication technology. This interest is extended into the discussion of recycling existing infrastructure. In this treatise, a topic which ties into both the heritage and ecological discourse. It recognises the significance of historical urban elements and the finite quality of heritage resources within the city. A historical building used as a host for the design of a 3D printing facility invites a dialogue between the architecture of the old and the expression of the new. The Premier Mill Building is identified as an historical urban artefact and the proposed programme complements the historical background of the building, which was a granary. A building from another time, now caught in a post-industrial age. The primary architectural exploration focuses on the possibilities offered by 3D printing in the making and expression of architecture. Therefore research is focused on the types and processes of 3D printing and there products. Secondly, the treatise employs an urban artefact as a vehicle of expression for a new programme, which requires an understanding of the topic of marrying present and past architecture. In the treatise the city, is understood through the work of Aldo Rossi’s conceptual perspective of the city. Further, the topic of digital tectonic is explored in order to establish an expression of digital fabrication. Heritage and conservation principles are investigated to complete a theoretical understanding of the project. This treatise document is a record of the design process from start to finish. The document unpacks the treatise through its various stages of growth: project background; research; design strategies and final design

The design of a student resource centre in central Port Elizabeth

The city centre of Port Elizabeth houses a large percentage of the city’s student population. The primary tertiary institution, the Nelson Mandela Metropolitan University, is decentralised from the city centre. Thus, many students sacrifice a lot of time and money travelling far distances between the campus and home every day. The treatise proposes a Student Resource Centre in Central Port Elizabeth as an appropriate building that will provide the students with appropriate learning spaces and access to resources in close proximity to home. The treatise seeks to understand the aspects that influence the design of learning spaces. Students and pedagogy are constantly changing within the current age of technology. Learning spaces should be designed to satisfy student needs and reinforce current pedagogy. The treatise also investigates the challenges and opportunities of an identified site located within a precinct that is inaccessible and in a state of urban decay that causes segregation within the city. The Student Resource Centre will act as a central gathering and learning space serving the many varied needs of the students within its constituency, while also positively contributing to the urban context of the city as a whole

Training Programme Impact in Improving the Working Memory of Students with Learning Disabilities in Reading Arabic

The study aimed to investigate the effect of a training program on improving working memory for students with learning difficulties in reading Arabic. The study sample consisted of (10) students with learning disabilities from Basic Education students from the fifth and sixth grades, and those between the ages (10-11) years as a pilot group and (10) students from the same stage and of the same age as a control group. The researcher used a working memory battery, Raven Test, and a training program he prepared to achieve the study goal. The results showed that there are statistically significant differences in the fields of working memory scale between the members of the experimental and control groups in the dimensional measurement, and in favor of the experimental group to which the training program was applied, by applying the measure of working memory in its three fields. The results also showed that there are statistically significant differences between the pre and post measurements of the areas of the working memory scale in favor of the post application, and for the benefit of the experimental group,This confirms the effectiveness of the training program used. Some recommendations were suggested

“The Grand Old Man of Cotton”: Colonel Henry G. Hester, Economic Innovation, and the New Orleans Cotton Exchange, 1871-1932

After the American Civil War, and the collapse of the market in slave-produced cotton in the South, cotton merchants in New Orleans faced challenges in re-establishing the city as a central port for Southern cotton. As commodities exchanges emerged as centralized spaces for business in the 1870s, a new class of experts emerged, upon whose reports traders bought and sold newly developed securities derivatives. Henry G. Hester (1846- 1934), Secretary of the New Orleans Cotton Exchange, was an integral player in the development of the methods that governed sophisticated commodities trading around the world. His career at the New Orleans Cotton Exchange tells the story of the arrival of these methods and subsequent downfall of Euro-American centrality in the global cotton empire and contradicts previous histories that deemphasize Southern businesspersons’ contributions to modernization

The Study Of Production Regimes And Quality Parameters Of Extruded Feed Additive Based On Corn Seed And Substandard Egg Mass

On the base of practical studies were established the rational parameters of technological processes of production of extruded feed additive. There was determined an expedience of mixture of substandard chicken egg mass and the crushed corn seed in two stages in frame (during 18 s) and blade (during 120…180 s) mixers. There were determined the optimal regimes of mixture extruding: pressure in working zone of extruder 2…3 mPa, consumed force of electric motor 4,0…4,5 kW, temperature on outcome of extruder 110…120 ºС, duration of process 60…120 s, diameter of matrix port 10 mm.There were given the results of study of parameters of quality and nutritive value of extruded feed additive. It was established, that in the process of extruding the quality parameters of food additive are improved at the expense of dextrinization and gelatinization of starch, decrease of bacterial and fungal pollution, disinfection of product.There was proved a possibility to solve problem of utilization of defective eggs at feeding poultry

Flexible-Resolution, Arbitrary-Input and Tunable Rotman Lens Spectrum Decomposer (RL-SD)

We present an enhanced design -- in terms of resolution flexibility, input port position arbitrariness and frequency-range tunability -- of the planar Rotman lens spectrum decomposer (RL-SD). This enhancement is achieved by manipulating the output port locations through proper sampling of the frequency-position law of the RL-SD, inserting a calibration array compensating for frequency deviation induced by input modification and introducing port switching, respectively. A complete design procedure is provided and two enhanced RL-SD prototypes, with uniform port distribution and uniform frequency resolution, respectively, are numerically and experimentally demonstrated

The secret life of public sculpture: an explorative case study on what the “voting line” does in Central, Port Elizabeth

To date, there has been little contemporary academic study on public art in Port Elizabeth. There have however been major art-led urban regeneration projects in the last ten years. This raises the question of what these artworks have been ‘doing’ in their relatively new homes. This study explores the function of the Voting Line, which was commissioned by the Mandela Bay Development Agency and made by Anthony Harris and Konrad Geel. The Voting Line is discussed as a key example of public artwork produced for Route 67. Using a case study design, four different approaches have been applied in this exploratory study. These include: document analysis, observation, interviews and a South African data making process called the Mmogo Method. The findings of this study suggest that the Voting Line is broadly considered as contributing towards nation building; cultural heritage tourism, and developing city identity

Three-year follow-up of posterior chamber phakic intraocular lens with a central port design after deep anterior lamellar keratoplasty

Background: To evaluate clinical outcomes of the Visian implantable collamer lens (ICL) with a central port to correct myopia and astigmatism after deep anterior lamellar keratoplasty (DALK) for keratoconus throughout 3 years of follow-up. Methods: This study included 20 eyes of 20 patients that underwent V4c ICL (13 eyes with a spherical ICL and 7 eyes with a toric ICL) implantation after DALK. Uncorrected (UDVA) and corrected (CDVA) distance visual acuities, refraction, intraocular pressure (IOP), endothelial cell density (ECD), and vault were analyzed. Results: The mean UDVA improved from the preoperative 1.18 ± 0.33 logMAR to 0.25 ± 0.14 logMAR at 6 months after surgery (P < 0.0001) and remained unchanged throughout the whole follow-up (P = 0.4). All eyes gained lines of CDVA compared to preoperative values. At the last follow-up visit, all eyes achieved CDVA of 0.2 logMAR or better and 13 eyes (65%) 0.1 logMAR or better. At 6 months post-surgery, all eyes (100%) had a spherical equivalent within ± 1.50 D, and 19 (95%) within ± 1.00 D. The mean manifest spherical equivalent was stable over the postoperative follow-up (P = 0.25). No significant increase in IOP occurred in any case throughout the 3 years of follow-up. The loss in ECD from the preoperative baseline at the last follow-up visit was 2.27%. Conclusions: The clinical outcomes suggest that the V4c ICL implantation for correction of myopia and regular astigmatism in post-DALK eyes was satisfactory in terms of effectiveness, safety, and stability during 3 years of follow-up.Depto. de Optometría y VisiónFac. de Óptica y OptometríaTRUESTAAR® Surgical (Estados Unidos)pu

The downwind hemisphere of the heliosphere: Eight years of IBEX-Lo observations

We present a comprehensive study of energetic neutral atoms (ENAs) of 10 eV to 2.5 keV from the downwind hemisphere of the heliosphere. These ENAs are believed to originate mostly from pickup protons and solar wind protons in the inner heliosheath. This study includes all low-energy observations made with the Interstellar Boundary Explorer over the first 8 years. Since the protons around 0.1 keV dominate the plasma pressure in the inner heliosheath in downwind direction, these ENA observations offer the unique opportunity to constrain the plasma properties and dimensions of the heliosheath where no in-situ observations are available. We first derive energy spectra of ENA intensities averaged over time for 49 macropixels covering the entire downwind hemisphere. The results confirm previous studies regarding integral intensities and the roll-over around 0.1 keV energy. With the expanded dataset we now find that ENA intensities at 0.2 and 0.1 keV seem to anti-correlate with solar activity. We then derive the product of total plasma pressure and emission thickness of protons in the heliosheath to estimate lower limits on the thickness of the inner heliosheath. The temporally averaged ENA intensities support a rather spherical shape of the termination shock and a heliosheath thickness between 150 and 210 au for most regions of the downwind hemisphere. Around the nominal downwind direction of 76{\deg} ecliptic longitude, the heliosheath is at least 280 au thick. There, the neutral hydrogen density seems to be depleted compared to upwind directions by roughly a factor of 2.Comment: Preprint of article in The Astrophysical Journa