Auswahl der wissenschaftlichen Literatur zum Thema „Edge protection corner“

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Zeitschriftenartikel zum Thema "Edge protection corner"

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Brown, A. P. „Inflight icing data gathering during routine flight operations — a case study“. Aeronautical Journal 105, Nr. 1051 (September 2001): 501–16. http://dx.doi.org/10.1017/s0001924000017942.

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Abstract For the purpose of the design and certification of inflight icing protection systems for transport and general aviation aircraft, the eventual re-definition/expansion of the icing environment of FAR 25/JAR 25, Appendix C is under consideration. Such a re-definition will be aided by gathering as much inflight icing event data as reasonably possible, from widely-different geographic locations. The results of a 12-month pilot programme of icing event data gathering are presented. Using non-instrumented turboprop aircraft flying upon mid-altitude routine air transport operations, the programme has gathered observational data from across the British Isles and central France. By observing a number of metrics, notably windscreen lower-corner ice impingement limits, against an opposing corner vortex-flow, supported by wing leading edge impingement limits, the observed icing events have been classified as ‘small’, ‘medium’ or ‘large’ droplet. Using the guidance of droplet trajectory modelling, MVD values for the three droplet size bins have been conjectured to be 15, 40 and 80mm. Hence, the ‘large’ droplet category would be in exceedance of FAR/JAR 25, Appendix C. Data sets of 117 winter-season and 55 summer-season icing events have been statistically analysed. As defined above, the data sets include 11 winter and five summer large droplet icing encounters. Icing events included ‘sandpaper’ icing from short-duration ‘large’ droplets, and a singular ridge formation icing event in ‘large’ droplet. The frequency of ‘large’ droplet icing events amounted to 1 in 20 flight hours in winter and 1 in 35 flight hours in summer. These figures reflect ‘large’ droplet icing encounter probabilities perhaps substantially greater than previously considered. The ‘large’ droplet events were quite localised, mean scale-size being about 6nm.
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Cirpici, Burak Kaan. „Design analysis of a steel industrial building with wide openings exposed to fire“. Challenge Journal of Structural Mechanics 6, Nr. 3 (08.09.2020): 99. http://dx.doi.org/10.20528/cjsmec.2020.03.001.

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In order to design a fire-resistant steel structure, the change in the physical and mechanical properties of the steel at high temperatures must be known. As the temperature of steel structural elements increases during fire, their strength decreases considerably. After a certain temperature, these strength drops reach critical levels. Therefore, collapses and various deformations (buckling, arching, etc.) occur. To prevent these collapses during the fire, various fire protection materials must be applied to the structural members such as column and beam. Columns are the most critical structural elements in a steel bearing system. While the possible collapse of the columns may cause the collapse of the whole structure, the beams alone may not cause the collapse of the structure, and the column-beam junctions directly affect the spread of fire. Since there will be many openings and gaps in industrial buildings, the spread and growth of a possible fire becomes very serious. Special fire protection measures are therefore required. In this study, the behavior of a steel industrial structure designed and designed under the influence of Standard Fire (ISO 834) was investigated, the distribution of the temperatures in the structural elements was determined, the required fire protection material was selected, and both protected and unprotected steel temperatures were determined. This design against fire is designed to provide fire resistance for 1 hour (60 min) for this structure. During this period, the type and optimum thickness of the protection material to be applied before reaching the critical temperature values for which the strength of the steel material would lose and would be damaged and compared with the temperatures that would occur in the structural elements without applying fire protection. According to the findings of the study, it was concluded that 25 mm drywall box protection material should be applied on the inner columns and 20 mm on the edge columns and 15 mm on the corner columns. In addition to this, it was concluded that spray beams (intumescent coating) of different thicknesses between 15-20 mm were applied to the beams depending on the location and the load to be affected and the type of joint. After these applied passive fire protection materials, the temperatures obtained in the structural elements reached to 500-550 as a result of 1-hour fire design. These temperatures are acceptable temperature values given the strength drop in critical temperature ranges for steel under the 1-hour fire condition.
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Kim, Y. W., und D. E. Metzger. „Heat Transfer and Effectiveness on Film Cooled Turbine Blade Tip Models“. Journal of Turbomachinery 117, Nr. 1 (01.01.1995): 12–21. http://dx.doi.org/10.1115/1.2835630.

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In unshrouded axial turbine stages, a small but generally unavoidable clearance between the blade tips and the stationary outer seal allows a clearance gap leakage flow to be driven across the blade tip by the pressure-to-suction side pressure difference. In modern high-temperature machines, the turbine blade tips are often a region prone to early failure because of the presence of hot gases in the gap and the resultant added convection heating that must be counteracted by active blade cooling. The blade tip region, particularly near the trailing edge, is often very difficult to cool adequately with blade internal coolant flow, and film cooling injection directly onto the blade tip region can be used in an attempt to reduce the heat transfer rates directly from the hot clearance flow to the blade tip. An experimental program has been designed and conducted to model and measure the effects of film coolant injection on convection heat transfer to turbine blade tips. The modeling approach follows earlier work that found the leakage flow to be mainly a pressure-driven flow related strongly to the airfoil pressure loading distribution and only weakly, if at all, to the relative motion between blade tip and shroud. In the present work the clearance gap and blade tip region is thus modeled in stationary form with primary flow supplied to a narrow channel simulating the clearance gap above a plane blade tip. Secondary film flow is supplied to the tip surface through a line array of discrete normal injection holes near the upstream or pressure side. Both heat transfer and effectiveness are determined locally over the test surface downstream of injection through the use of thin liquid crystal coatings and a computer vision system over an extensive test matrix of clearance heights, clearance flow Reynolds numbers, and film flow rates. The results of the study indicate that film injection near the pressure-side corner on plane turbine blade tips can provide significant protection from convection heat transfer to the tip from the hot clearance gap leakage flow.
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Benkara, Dana. „Restaurarea unei picturi pe pânză de Aurél Náray (1883–1948)“. Anuarul Muzeului Etnograif al Transilvaniei 34 (20.12.2020): 317–30. http://dx.doi.org/10.47802/amet.2020.34.17.

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"The restoration of a painted canvas by Aurél Náray (1883-1948) This study shows the restoration work made on the painted canvas of the Hungarian artist Aurél Náray (1883-1948), depicting an ecclesiastic subject (Saint Joseph with the infant Jesus). This oil painting comes from a private art collector and has the following dimensions: 42x57.5 cm, being sustained by a wooden stretcher. The painting is signed and dated by the artist himself on the lower left corner (“Aurél Náray 909”). The canvas is fixed on the underframe with metallic nails; as a result of the wood having dried, the frame shows slight distortions. The face of the painting displays small portions of missing white primer and/ or colour, erosions of the paint layer, two little punctures in the canvas, and a small area of distorted canvas placed toward the lower edge of the painting. Adherence of thin dirt can be observed on the surface of the painting while the back of the canvas bears heavy traces of dust and dirt, especially on its margins. The actual restoration process of the painted canvas referred to the following: drawing up the initial photograhic documentation, superficial dust cleaning on the back of the canvas, detachment of the painting from its old underframe and the building of a new and proper wooden stretcher. After the plainness of the painting was restored and the two small pricked points on the canvas were consolidated (with the use of Beva 371 adhesive), a strip lining on the margins of the canvas was carried out, in order to be able to fix the canvas on the new underframe. Cleaning of the surface came next, followed by the filling of the missing primer layer with putty. The chromatic integration of the painting was accomplished (after having sealed the original paint with a thin layer of intermediary varnish) with the use of low oil content colours and the final protection of a second satin varnish layer. Keywords: painted canvas, restoration, stretcher, strip lining, varnish "
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Shao, Xiao Ping, und Yu Cheng Xia. „Modeling and Numerical Optimal Simulation of Coal Pillar’s Failure Process on Longwall Leaving Coal Pillar Mining“. Applied Mechanics and Materials 88-89 (August 2011): 285–90. http://dx.doi.org/10.4028/www.scientific.net/amm.88-89.285.

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To further optimize mining methods and parameters at regions of “protecting water mining”, this paper has made modeling and numerical optimal simulation of coal pillar’s failure process under two kinds of mining method including “taking 8 remaining 7” leaving the region pillars and “taking 12 remaining 8” leaving strip coal pillars for Yubojie coal mine in northern Shaanxi province in China. Simulation showed that the stability of strip coal pillars is better than the region coal pillars at the same advancing distance. The region coal pillars first appeared corner plastic failure and maybe become hexagonal pillars. Plastic failure of the rectangular pillar extended and penetrated from the corner along the edge. Plastic damage of pillars showed tendency from the middle to the roadway side of the face along the length direction of face. Stability of central elastic core of coal pillar is the basis of pillar stability. Simulation results showed that it is feasible to optimize mining methods and parameters of “protecting water mining" areas based on modeling and numerical simulation of pillar failure process. The method has provided a useful reference to mining method and optimization design research for other regions with same type of domestic and international coal mines.
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Antal, Mária Réka, Levente Dénes, Zsigmond András Vas und András Polgár. „Comparative Study of Conventional and Zero-joint Edgebanding“. Acta Silvatica et Lignaria Hungarica 17, Nr. 1 (2021): 21–35. http://dx.doi.org/10.37045/aslh-2021-0002.

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Edgebanding affects both the visual appearance and edge protection of wood-based panels. In order for edgebanding to provide the desired protection, it must adhere strongly to the entire surface of the panel edges and maintain this adhesion throughout the life of the product. The present research compares conventional and so-called zero-joint edgebandings in terms of water and steam resistance, and examines the environmental impacts of edgebanding technologies using Life Cycle Assessment (LCA). In-line with our hypothesis, our test results showed that corners are the critical points of edgebanded furniture fronts, especially when exposed to moisture. Due to high variations in measurements, there is no significant difference between the two edgebanding methods at the beginning. However, differences become more significant after longer treatment times. These differences amount to two quality categories after 6 hours and three quality categories after 12 and 24 hours. The edgebanded fronts exposed to water for less than 30 minutes experience no significant deteriorations with any of the edgebanding methods. In the case of steam resistance, zero-joint edgebanding provides better protection, especially after the second and third treatment cycle. We can state that the surplus costs of zero-joint technology are 1.45 times greater than costs associated with conventional technology. Both show the considerable costs of edging materials, chipboard, and electrical energy. The applied environmental life cycle assessment (LCA) method corresponds to the requirements of ISO 14040:2006 and ISO 14044:2006 standards. We built up the environmental inventory and the life cycle model of the manufacturing technology using the GaBi Professional LCA software. In the impact assessment, we analysed the specific environmental impact categories of the differing production processes by technology according to the operation order of the manufacturing technology. In relation to traditional and the zero-joint edging technologies, according to all impact assessment methods, the life-cycle contribution rate was uniformly 47% traditional – 53% zero-joint by impact category. The higher indicator values of the zero-joint method are due to larger edge material consumption and higher energy demand. Zero-joint technology appears to avoid the application of conventional hot melt adhesives, but replacing these adhesives does not necessarily result in better environmental indicators. Nevertheless, zero-joint egdebanding does not just improve aesthetic appearance but also exceeds the durability provided by conventional edgebanding technology.
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Zhao, Yu Xia, Cheng Mei Liu, Lu Han und Yen Wei. „Shape-Controlled Synthesis of Ag Nanocubes with Uniform Size“. Advanced Materials Research 1004-1005 (August 2014): 37–41. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.37.

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The controllable synthesis of special shape of nanoparticles with uniform size was most important for some special applications. In this work, we prepared silver nanocubes by Na2S-mediated polyol synthesis using AgNO3 as precursor, polyvinyl pyrrolidine(PVP) as capping agent and ethylene glycol(EG) as solvent and reductant under the protection of Ar characterized by SEM, UV-vis, DLS and Zeta potential. Silver nanocubes were successfully controllably obtained via optimizing the reaction conditions, such as the rate of Ar initially after 50 min pre-heating and subsequently after the addition of AgNO3 solution,the volume of 3 mM Na2S solution. The results showed that silver nanocubes with edge length of 50 nm and sharp corners were achieved at 230μL 3mM Na2S solution added under a Ar rate of 1000 ml/min.
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Marty, Julien, und Cédric Uribe. „Impact of Underlying RANS Turbulence Models in Zonal Detached Eddy Simulation: Application to a Compressor Rotor“. International Journal of Turbomachinery, Propulsion and Power 5, Nr. 3 (26.08.2020): 22. http://dx.doi.org/10.3390/ijtpp5030022.

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The present study focuses on the impact of the underlying RANS turbulence model in the Zonal Detached Eddy Simulation (ZDES) method when used for secondary flow prediction. This is carried out in light of three issues commonly investigated for hybrid RANS/LES methods (detection and protection of attached boundary layer, emergence, and growth of resolved turbulent fluctuations and accurate prediction of separation front due to progressive adverse pressure gradient). The studied configuration is the first rotor of a high pressure compressor. Three different turbulence modelings (Spalart and Allmaras model (SA), Menter model with (SST) and without (BSL) shear stress correction) are assessed as ZDES underlying turbulence model and also as turbulence model of unsteady RANS simulations. Whatever the underlying turbulence model, the ZDES behaves well with respect to the first two issues as the boundary layers appear effectively shielded and the RANS-to-LES switch is close downstream of trailing edges and separation fronts leading to a quick LES treatment of wakes and shear layers. Both tip leakage and corner flows are strongly influenced by the Navier–Stokes resolution approach (unsteady RANS vs. ZDES) but the underlying turbulence modelling (SA vs. SST vs. BSL) impacts mainly the junction flow near the hub for both approaches. ZDES underlying turbulence model choice appear essential since it leads to quite different corner flow separation topologies and so to inversion of the downstream stagnation pressure radial gradient.
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Di, Jian, Haibo Yan, Zhuoyu Liu und Xing Ding. „Synthesis and Characterization of Anatase TiO2 Microspheres Self-Assembled by Ultrathin Nanosheets“. Materials 14, Nr. 11 (27.05.2021): 2870. http://dx.doi.org/10.3390/ma14112870.

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In this paper, we report a novel and simple method for synthesizing the microspheres self-assembled from ultrathin anatase TiO2 nanosheets with a high percentage of (001) facets via the hydrolysis process of the single-reagent (potassium fluorotitanate). We then used optical microscopy, scanning electron microscopy, and high-resolution confocal laser Raman spectroscopy to characterize the microspheres generated under different conditions. The study found that the size of the anatase TiO2 microspheres synthesized was 0.5–3 μm. As the synthesis time increased, the corroded surface of the microspheres gradually increased, resulting in the gradual disappearance of the edges and corners of the anatase nanosheets. The exposure percentage of the (001) facets of ultrathin anatase nanosheets synthesized for 2 h at 180–200 °C are close to 100%. The microsphere whose surface is completely covered by these anatase nanosheets also has nearly 100% exposed (001) facets. This new anatase nanosheet-based self-assembled microsphere will have great application potential in pollution prevention, environmental protection, and energy fields.
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de Oliveira, Misael Souto, Antonio Almeida Silva, Marco Antonio dos Santos, Jorge Antonio Palma Carrasco und João Vitor de Queiroz Marques. „Calibration of the AC Potential Dropping System (ACPD) for Determination of Crack Growth in API 5L X65 Steel under Cathodic Protection Effect“. Materials Science Forum 1012 (Oktober 2020): 412–17. http://dx.doi.org/10.4028/www.scientific.net/msf.1012.412.

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In this work the calibration of an Alternative Current Potential Drop (ACPD) system was performed to monitore laboratory mechanical tests on marine environment under cathodic protection. The calibration was done on CT type specimens of API 5L X65 steel dimensioned according to ASTM E1820 standard., The crack propagation during a tensile test with displacement control in an ACPD equipment was monitored through the performs points collection by two channels: one that monitors the crack growth and another that monitors a region free of crack. Using a profile projector and graphical data processing and analysis software, the area of ​​the fracture surface of the specimen was meansured, which allowed to correlate a crack size with a corresponding value of potential drop and the calibration curve. In order to verify verify the efficacy and precision of the technique, step loading tests were performed on API 5L X65 steel test specimens, submerged in synthetic sea water under the overprotection potential of-1300mVAg/AgCl. The results of the calibration showed few dispersed errors, and the main factors of this dispersion may be related to the geometry of the specimen and with variations in current flow density, which is influenced by corners and edges and by the presence of pick-up inductive. The calibration and its effectiveness can be verified through the results of the tests in marine environment, presenting crack lengths close to the actual values, confirming the effectiveness of the ACPD technique.
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Dissertationen zum Thema "Edge protection corner"

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Havelka, Michal. „Automatický aplikační systém ochranných rohů paletizovaného materiálu“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442814.

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The diploma thesis is about the design of an automatic application system of edge protection corners to palletized material. As the first the diploma thesis briefly discusses actual principles and solutions in area of palletization. After that, there are 4 potential solutions described and measured by multicriteria evaluation method where the most suitable solution is being chosen. Then the actual act of designing of the chosen solution is described and also there are solved necessary calculations. In the end there is risk analysis of new workplace and the drawing documentation of selected nodes is attached. The diploma thesis’ assignment has been made in cooperation with company PHATEC s.r.o. in Litomyšl.
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Bücher zum Thema "Edge protection corner"

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Charbonneau, Oliver. Civilizational Imperatives. Cornell University Press, 2020. http://dx.doi.org/10.7591/cornell/9781501750724.001.0001.

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This book reveals the little-known history of the United States' colonization of the Philippines' Muslim South in the early twentieth century. Often referred to as Moroland, the Sulu Archipelago and the island of Mindanao were sites of intense US engagement and laboratories of colonial modernity during an age of global imperialism. Exploring the complex relationship between colonizer and colonized from the late nineteenth century until the eve of the Second World War, the book argues that American power in the Islamic Philippines rested upon a transformative vision of colonial rule. Civilization, protection, and instruction became watchwords for U.S. military officers and civilian administrators, who enacted fantasies of racial reform among the diverse societies of the region. Violence saturated their efforts to remake indigenous politics and culture, embedding itself into governance strategies used across four decades. Although it took place on the edges of the Philippine colonial state, this fraught civilizing mission did not occur in isolation. It shared structural and ideological connections to U.S. settler conquest in North America and also borrowed liberally from European and Islamic empires. These circuits of cultural, political, and institutional exchange — accessed by colonial and anticolonial actors alike — gave empire in the Southern Philippines its hybrid character. This book is a story of colonization and connection, reaching across nations and empires in its examination of a Southeast Asian space under US sovereignty. It presents an innovative new portrait of the American empire's global dimensions and the many ways they shaped the colonial encounter in the Southern Philippines.
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Konferenzberichte zum Thema "Edge protection corner"

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Yoon, Jae H., und Ricardo F. Martinez-Botas. „Film Cooling Performance in a Simulated Turbine Blade Tip Geometry“. In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68863.

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One of the most problematic areas in gas turbine engines is the blade tip region, especially near the trailing edge, where it is very difficult to provide sufficient cooling. In all configurations with unshrouded tips, a clearance gap exists between the turbine blade and the outer shroud. The pressure difference between the suction and pressure sides of the blade drives a sink-like flow through this gap. The combination of leakage flow from the freestream and coolant flow induces high convective heat transfer coefficients on the blade tip surface. The resultant thermal loading can be significant and detrimental to the turbine blade tip durability, leading to early failure. Film cooling can be provided by means of a series of holes located on the tip itself providing protection not dissimilar to film cooling of the main blade. However, the interaction of coolant and the separation bubble resulted in a significantly different film cooling performance to that of non-tip cases. An experimental investigation of the simulated turbine blade tip is presented in here. The first section discusses PIV flow field measurements, the second covers the measurement of film cooling effectiveness and the third heat transfer measurements. All three parts investigate the effect of using different film cooling injection points and blowing ratios for injection on the blade tip itself, close to the pressure surface corner. Additionally, the effect of varying the corner radii between the pressure surface and the tip is reported. The experimental method uses the steady state liquid crystal technique. A Reynolds number of 30,000 based on the clearance gap hydraulic diameter for the main flow was used.
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Kim, Y. W., und D. E. Metzger. „Heat Transfer and Effectiveness on Film Cooled Turbine Blade Tip Models“. In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-208.

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In unshrouded axial turbine stages, a small but generally unavoidable clearance between the blade tips and the stationary outer seal allows a clearance gap leakage flow to be driven across the blade tip by the pressure-to-suction side pressure difference. In modern high temperature machines, the turbine blade tips are often a region prone to early failure because of the presence of hot gases in the gap and the resultant added convection heating that must be counteracted by active blade cooling. The blade tip region, particularly near the trailing edge, is often very difficult to cool adequately with blade internal coolant flow, and film cooling injection directly onto the blade tip region can be used in an attempt to directly reduce the heat transfer rates from the hot clearance flow to the blade tip. An experimental program has been designed and conducted to model and measure the effects of film coolant injection on convection heat transfer to turbine blade tips. The modeling approach follows earlier work that found the leakage flow to be mainly a pressure-driven flow related strongly to the the airfoil pressure loading distribution and only weakly, if at all, to the relative motion between blade tip and shroud. In the present work the clearance gap and blade tip region is thus modeled in stationary form with primary flow supplied to a narrow channel simulating the clearance gap above a plane blade tip. Secondary film flow is supplied to the tip surface through a line array of discrete normal injection holes near the upstream or pressure side. Both heat transfer and effectiveness are determined locally over the test surface downstream of injection through the use of thin liquid crystal coatings and a computer vision system over an extensive test matrix of clearance heights, clearance flow Reynolds numbers and film flowrates. The results of the study indicate that film injection near the pressure-side corner on plane turbine blade tips can provide significant protection from convection heat transfer to the tip from the hot clearance gap leakage flow.
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Berichte der Organisationen zum Thema "Edge protection corner"

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African Open Science Platform Part 1: Landscape Study. Academy of Science of South Africa (ASSAf), 2019. http://dx.doi.org/10.17159/assaf.2019/0047.

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This report maps the African landscape of Open Science – with a focus on Open Data as a sub-set of Open Science. Data to inform the landscape study were collected through a variety of methods, including surveys, desk research, engagement with a community of practice, networking with stakeholders, participation in conferences, case study presentations, and workshops hosted. Although the majority of African countries (35 of 54) demonstrates commitment to science through its investment in research and development (R&D), academies of science, ministries of science and technology, policies, recognition of research, and participation in the Science Granting Councils Initiative (SGCI), the following countries demonstrate the highest commitment and political willingness to invest in science: Botswana, Ethiopia, Kenya, Senegal, South Africa, Tanzania, and Uganda. In addition to existing policies in Science, Technology and Innovation (STI), the following countries have made progress towards Open Data policies: Botswana, Kenya, Madagascar, Mauritius, South Africa and Uganda. Only two African countries (Kenya and South Africa) at this stage contribute 0.8% of its GDP (Gross Domestic Product) to R&D (Research and Development), which is the closest to the AU’s (African Union’s) suggested 1%. Countries such as Lesotho and Madagascar ranked as 0%, while the R&D expenditure for 24 African countries is unknown. In addition to this, science globally has become fully dependent on stable ICT (Information and Communication Technologies) infrastructure, which includes connectivity/bandwidth, high performance computing facilities and data services. This is especially applicable since countries globally are finding themselves in the midst of the 4th Industrial Revolution (4IR), which is not only “about” data, but which “is” data. According to an article1 by Alan Marcus (2015) (Senior Director, Head of Information Technology and Telecommunications Industries, World Economic Forum), “At its core, data represents a post-industrial opportunity. Its uses have unprecedented complexity, velocity and global reach. As digital communications become ubiquitous, data will rule in a world where nearly everyone and everything is connected in real time. That will require a highly reliable, secure and available infrastructure at its core, and innovation at the edge.” Every industry is affected as part of this revolution – also science. An important component of the digital transformation is “trust” – people must be able to trust that governments and all other industries (including the science sector), adequately handle and protect their data. This requires accountability on a global level, and digital industries must embrace the change and go for a higher standard of protection. “This will reassure consumers and citizens, benefitting the whole digital economy”, says Marcus. A stable and secure information and communication technologies (ICT) infrastructure – currently provided by the National Research and Education Networks (NRENs) – is key to advance collaboration in science. The AfricaConnect2 project (AfricaConnect (2012–2014) and AfricaConnect2 (2016–2018)) through establishing connectivity between National Research and Education Networks (NRENs), is planning to roll out AfricaConnect3 by the end of 2019. The concern however is that selected African governments (with the exception of a few countries such as South Africa, Mozambique, Ethiopia and others) have low awareness of the impact the Internet has today on all societal levels, how much ICT (and the 4th Industrial Revolution) have affected research, and the added value an NREN can bring to higher education and research in addressing the respective needs, which is far more complex than simply providing connectivity. Apart from more commitment and investment in R&D, African governments – to become and remain part of the 4th Industrial Revolution – have no option other than to acknowledge and commit to the role NRENs play in advancing science towards addressing the SDG (Sustainable Development Goals). For successful collaboration and direction, it is fundamental that policies within one country are aligned with one another. Alignment on continental level is crucial for the future Pan-African African Open Science Platform to be successful. Both the HIPSSA ((Harmonization of ICT Policies in Sub-Saharan Africa)3 project and WATRA (the West Africa Telecommunications Regulators Assembly)4, have made progress towards the regulation of the telecom sector, and in particular of bottlenecks which curb the development of competition among ISPs. A study under HIPSSA identified potential bottlenecks in access at an affordable price to the international capacity of submarine cables and suggested means and tools used by regulators to remedy them. Work on the recommended measures and making them operational continues in collaboration with WATRA. In addition to sufficient bandwidth and connectivity, high-performance computing facilities and services in support of data sharing are also required. The South African National Integrated Cyberinfrastructure System5 (NICIS) has made great progress in planning and setting up a cyberinfrastructure ecosystem in support of collaborative science and data sharing. The regional Southern African Development Community6 (SADC) Cyber-infrastructure Framework provides a valuable roadmap towards high-speed Internet, developing human capacity and skills in ICT technologies, high- performance computing and more. The following countries have been identified as having high-performance computing facilities, some as a result of the Square Kilometre Array7 (SKA) partnership: Botswana, Ghana, Kenya, Madagascar, Mozambique, Mauritius, Namibia, South Africa, Tunisia, and Zambia. More and more NRENs – especially the Level 6 NRENs 8 (Algeria, Egypt, Kenya, South Africa, and recently Zambia) – are exploring offering additional services; also in support of data sharing and transfer. The following NRENs already allow for running data-intensive applications and sharing of high-end computing assets, bio-modelling and computation on high-performance/ supercomputers: KENET (Kenya), TENET (South Africa), RENU (Uganda), ZAMREN (Zambia), EUN (Egypt) and ARN (Algeria). Fifteen higher education training institutions from eight African countries (Botswana, Benin, Kenya, Nigeria, Rwanda, South Africa, Sudan, and Tanzania) have been identified as offering formal courses on data science. In addition to formal degrees, a number of international short courses have been developed and free international online courses are also available as an option to build capacity and integrate as part of curricula. The small number of higher education or research intensive institutions offering data science is however insufficient, and there is a desperate need for more training in data science. The CODATA-RDA Schools of Research Data Science aim at addressing the continental need for foundational data skills across all disciplines, along with training conducted by The Carpentries 9 programme (specifically Data Carpentry 10 ). Thus far, CODATA-RDA schools in collaboration with AOSP, integrating content from Data Carpentry, were presented in Rwanda (in 2018), and during17-29 June 2019, in Ethiopia. Awareness regarding Open Science (including Open Data) is evident through the 12 Open Science-related Open Access/Open Data/Open Science declarations and agreements endorsed or signed by African governments; 200 Open Access journals from Africa registered on the Directory of Open Access Journals (DOAJ); 174 Open Access institutional research repositories registered on openDOAR (Directory of Open Access Repositories); 33 Open Access/Open Science policies registered on ROARMAP (Registry of Open Access Repository Mandates and Policies); 24 data repositories registered with the Registry of Data Repositories (re3data.org) (although the pilot project identified 66 research data repositories); and one data repository assigned the CoreTrustSeal. Although this is a start, far more needs to be done to align African data curation and research practices with global standards. Funding to conduct research remains a challenge. African researchers mostly fund their own research, and there are little incentives for them to make their research and accompanying data sets openly accessible. Funding and peer recognition, along with an enabling research environment conducive for research, are regarded as major incentives. The landscape report concludes with a number of concerns towards sharing research data openly, as well as challenges in terms of Open Data policy, ICT infrastructure supportive of data sharing, capacity building, lack of skills, and the need for incentives. Although great progress has been made in terms of Open Science and Open Data practices, more awareness needs to be created and further advocacy efforts are required for buy-in from African governments. A federated African Open Science Platform (AOSP) will not only encourage more collaboration among researchers in addressing the SDGs, but it will also benefit the many stakeholders identified as part of the pilot phase. The time is now, for governments in Africa, to acknowledge the important role of science in general, but specifically Open Science and Open Data, through developing and aligning the relevant policies, investing in an ICT infrastructure conducive for data sharing through committing funding to making NRENs financially sustainable, incentivising open research practices by scientists, and creating opportunities for more scientists and stakeholders across all disciplines to be trained in data management.
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