World records Dibaba and Wlodarczyk both set world records – three minutes 50.07 seconds for the 1500 and 81.08 metres for the hammer throw, respectively – before their wins at the World Championships. The Track and Field News panel could only separate them by three points, 312 to 309. In fact, 17 members of the panel felt that the Pole was number one compared to 16 who voted for Dibaba. Holland’s Dafne Schippers finished third with Jamaica’s 100-metre World champion, Shelly-Ann Fraser-Pryce, appearing at number six. Bolt and Fraser-Pryce were voted as the year’s top performers in the men’s 200 metres and the women’s 100m, respectively. American Justin Gatlin, and not Bolt, is the magazine’s number one in the 100 metres. Details aren’t available yet on the website, but in its 2014 Annual World Rankings issue, Track and Field said: “As important as major meets are, we should also note that no competition, not even the Olympic Games, is the be-all, end-all. We’re looking for people who maintain high standards over a whole year.” Restricted by injuries, Bolt did the 100 metres in only three 2015 athletics meetings, with clockings of 10.12, 9.87 and 9.79 seconds, respectively. The latter time pipped Gatlin in the World Championships. That was the American’s only loss of a seven-meet season that yielded times of 9.74, the fastest in 2015, 9.75 twice, 9.77, 9.78, 9.80 behind Bolt at the Worlds and 9.98 seconds. Gatlin isn’t the only athlete to top the rankings in an individual event despite losing at the World Championships. Others include Mutaz Essa Barshim of Qatar, who was fourth in the high jump at the Worlds, French pole vault star Renaud Lavillenie, Kenyan Eunice Sum in the 800 metres, Croatian discus thrower Sandra Perkovic and American Dawn Harper-Nelson, who fell in the semis of the 100-metre hurdles. The respected United States publication, Track and Field News, has named American Ashton Eaton and Genzebe Dibaba of Ethiopia as its Athletes of the Year for 2015. Despite contesting just one decathlon for the entire season, Eaton won the bulk of the votes from a 36-member international panel to emerge ahead of triple jumper Christian Taylor and Jamaican sprinter supreme Usain Bolt. It was far closer among the women, with Dibaba edging Poland’s Anita Wlodarczyk, the 2014 Athlete of the Year. According to a notification appearing on the magazine’s Internet site, Eaton’s world record performance – 9,045 points – at the World Championships tipped the voting his way. In fact, it was voted the Performance of the Year. The magazine’s website notes that two members of the panel objected to the season on the grounds that Eaton’s single decathlon did not ‘constitute a full season’.
12 November 2009UK-based communications research company Informa Telecoms & Media is to open a new office in Johannesburg, giving it direct access to the fast-growing African telecommunications market.Africa, with the launch of new submarine cables, as well as increased interest in mergers and acquisitions, is becoming a high priority for both new players and more established operators from all over the world.“Given the nature of the African market, we feel that now is the perfect time to open an office in the region,” Informa Telecoms & Media MD Martin Hill said in a statement this week.“By having an office in such a strategic location, we’re adding to our primary research capability and ensuring we remain the best-connected, most reliable research house in the market.”Getting closer to marketsSouth Africa was chosen due to its importance in region, both in the field of telecoms and in the economy in general.“We are constantly striving to get even closer to the markets that we serve and recognise the importance of having analysts on the ground in all regions around the world,” Hill said.“We know that only by having a dedicated team specialised in a specific geography, and with the relevant local network of contacts and language skills, can we credibly ensure our research delivers the granular insights demanded by our global portfolio of clients.”‘Significant opportunity’The office will be headed up by Thecla Mbongue, a senior analyst who has been covering the African market for six years.“The African market still represents a significant opportunity for investors. The number of mobile broadband subscriptions grew by 126% year-on-year in [the second quarter of 2009], and when the new submarine cables go live, the competition and price reduction will see data connectivity, whether fixed or mobile, continue to grow,” Mbongue explained.“This is a critical time for the region and I look forward to providing crucial support and advice to the region’s telecoms and media industry.”SAinfo reporterWould you like to use this article in your publication or on your website? See: Using SAinfo material
It will be capable of probing the edges of our universe. It will search for gravitational waves, predicted but never detected. It will be a virtual time machine, enabling scientists to explore the origins of galaxies, stars and planets. And South Africans are at the heart of its development.South Africa, allied with eight other African countries, is competing against Australia (allied with New Zealand) to host the €1.5-billion Square Kilometre Array (SKA), an instrument 50-100 times more sensitive and 10 000 times faster than any radio imaging telescope yet built.South Africa, Australia to share SKAYouTube: SKA bid announcement media briefingThe international science funding agencies and governments involved in the international SKA consortium are due to announce the winning bidder in 2012, with construction likely to start in 2016 and take place in phases over several years, with completion by about 2022.More than 70 institutes in 20 countries, together with industry partners, are participating in the scientific and technical design of the SKA telescope, which will be located either in Australia and New Zealand or in southern Africa extending to the Indian Ocean Islands.The design, construction and operation of the telescope will have a potentially massive impact on skills development in science, engineering and associated industries, not only in the host countries but in all project partner countries.The SKA project will drive technology development in antennas, fibre networks, signal processing, and software and computing, with spin-off innovations in these areas set to benefit other systems that process large volumes of data.‘Time machine’At between 50 to 100 times more sensitive than any existing radio telescope, the SKA will be able to probe the edges of our universe, and help us to answer fundamental questions about the laws of nature and physics, including the study of so-called “dark energy” and “dark matter”.It will subject Einstein’s theory of general relativity to its most stringent tests yet, and will search for gravitational waves, which have been predicted but never detected.It will be a powerful virtual time machine, enabling scientists to “go back in time” to explore the origins of the first galaxies, stars and planets. If there is life somewhere else in the Milky Way galaxy, the SKA will help us find it.According to the South African SKA project office, the operations and maintenance of a large telescope normally cost about 10% of the capital costs per year, meaning the international SKA consortium would be spending approximately €100-million to €150-million a year on operating and maintaining the telescope.“It is expected that a significant portion of the capital, operations and maintenance costs would be spent in the host country,” says SKA South Africa’s Kim de Boer.The SKA in AfricaThe completed telescope will comprise around 3 000 antennas with a combined collecting area of roughly one square kilometre.South Africa plans to locate the core of these in the Karoo region of the Northern Cape – an arid, remote area blessed with exceptionally clear skies and minimal radio interference – with outlying stations in Botswana, Ghana, Kenya, Madagascar, Mauritius, Mozambique, Namibia and Zambia.The major component of the SKA telescope receptor will be an extensive array of approximately 3 000 antennas, half of which will be concentrated within a five kilometre diameter of the central region, with the rest distributed up to 3 000km from this central concentration. These antennas will be 12-15 metre diameter dishes.South Africa plans to locate the core of these in the arid Karoo region of the country’s Northern Cape province – an arid, remote area blessed with exceptionally clear skies and minimal radio interference – with outlying stations in Botswana, Ghana, Kenya, Madagascar, Mauritius, Mozambique, Namibia and Zambia. Added together, the combined collecting area of these antennas will be roughly one square kilometre.The antennas would be connected via a super-fast data communications network to an extremely large and powerful computer in the Northern Cape, and the telescope would be controlled and operated remotely from Cape Town, where the operations and science centre would be located.De Boer says the SKA will be one of the largest scientific research facilities in the world and, if awarded to South Africa, would consolidate the southern African region as a major international hub for astronomy and cutting-edge technology.It would attract the best scientists and engineers to work in Africa, and would provide unrivalled opportunities for scientists and engineers from African countries to work on cutting-edge research and collaborate in joint projects with the top universities in the world.Why the Northern Cape?The Karoo region of South Africa’s Northern Cape province is ideal for radio astronomy, because it is remote and sparsely populated, with a very dry climate.There is minimal radio frequency interference from man-made sources such as cellular phones and broadcast transmitters, which is crucial for radio astronomy, as radio interference would “blind” the telescope.In 2007, South Africa’s Parliament passed the Astronomy Geographic Advantage Act, which declares the Northern Cape an “astronomy advantage area”, giving the Minister of Science and Technology powers to protect the area from future radio interference.An area of 12.5-million hectares around the proposed core of the SKA will be protected as a radio astronomy reserve, with regulations controlling the generation and transmission of interfering radio signals in and around the area around.MeerKAT: world-class SKA precursorSouth Africa is no newcomer to major league astronomy. The Northern Cape is already home to one of the world’s largest telescopes, the Southern African Large Telescope or SALT.South Africa also works closely with neighbour Nambia on the HESS gamma ray telescope, and is currently building an 80-dish precursor instrument for the SKA, the Karoo Array Telescope (also known as the MeerKAT).Regardless of whether South Africa wins the SKA bid, the MeerKAT will be a powerful scientific instrument in its own right, comprising 80 dishes each 13.5-metres in diameter. It is being built adjacent to the site proposed for the SKA, in a radio astronomy reserve near the small town of Carnarvon in the Northern Cape, where it is due to be commissioned in 2014/15.An engineering test bed of seven dishes, called the KAT-7, is already complete.In the process of building the MeerKAT, South African engineers are already working on some of the SKA’s technological building blocks – such as a prototype dish antenna that combines new materials with innovative design processes to meet the SKA’s exacting precision, durability and cost criteria.MeerKAT: scientific programmesThe MeerKAT will be the most sensitive centimetre-wavelength radio telescope in the Southern Hemisphere, and astronomers from around the world are already queuing up to use it.Following an October 2009 invitation for applications for telescope time to perform large survey projects, 21 proposals involving more than 500 astronomers from around the world – including 59 from Africa – were received.A committee made up of local and international experts rated the proposals on the basis of their scientific merit, technical feasibility, the resources each group was prepared to bring to the project, and the extent to which the MeerKAT had a unique role to play in the proposed projects.In total, more than 43 000 hours of observation time have been allocated, of which nearly 8 000 hours were allocated to a proposal to test Einstein’s theory of relativity and investigate the physics of enigmatic neutron stars as part of a radio pulsar timing survey.In addition, 5 000 hours will be dedicated jointly to two proposals requiring an ultra-deep survey of neutral hydrogen gas in the early universe.The objectives of these studies coincide with those of the first phase of the SKA telescope itself, confirming the MeerKAT’s status as a SKA precursor instrument.MeerKAT-SKA collaborationAccording to the local SKA project office, the MeerKAT’s scientific programme will be a mixture of “blind” and “directed” surveys conducted by large project teams, and smaller experiments designed by individual principal investigators or small teams. These teams and principal investigators will be international in their composition, and will include participants from Africa.The MeerKAT scientists are fully embedded in the international SKA project, participating in technical committees and working groups set up by the SKA project development office.Bilateral agreements have been established with key institutions involved in the international SKA consortium, including the Universities of Oxford and Cambridge, the University of California at Berkeley and Caltech, the National Radio Astronomy Observatory (NRAO) of the USA, the national radio astronomy centre in India, and thee radio astronomy institutes in Italy.In South Africa, the Hartebeesthoek Radio Astronomy Observatory and the South African Astronomical Observatory are participating in the MeerKAT project, while researchers and students at many universities in South Africa and the rest of Africa are also actively participating.The local SKA project’s head office is in Rosebank, Johannesburg, while the MeerKAT engineering office is in Pinelands, Cape Town. The Department of Science and Technology is funding the SKA project via the National Research Foundation.Connectivity boost for SALT, SKAIn October 2010, the Council for Scientific and Industrial Research (CSIR) announced that it would be installing a R100-million ultra-high speed broadband link between the Northern Cape sites of both the Square Kilometre Array and the Southern African Large Telescope (SALT) and the SA National Research Network backbone in Cape Town.The ultra-high speed link will enable local and international researchers to process data from SALT and the KAT-7/MeerKAT in near real time, and significantly boost South Africa’s bid to host the SKA.The installation of the new link will demonstrate “that South Africa can provide the bandwidth needed to fulfil the requirements of the full SKA, and will serve as a significant boost to the South African SKA bid,” said Department of Science and Technology chief director Daniel Adams.National Research Foundation CEO Albert van Jaarsveld said the development paved the way for international collaborators to actively make use of the facilities that will be provided by the two telescope sites.“Furthermore, the broadband link demonstrates our ability to invest heavily in scientific infrastructure in support of our desire to win the SKA bid.”Skills development and trainingThe SKA South Africa project, including the MeerKAT telescope, is one of the biggest science and engineering projects in South Africa. It thus represents an unrivalled opportunity for the development of very high-level science and technology expertise – paving the way for Africa to contribute significantly to the global knowledge economy and global technology trade.These technologies include very fast grid computing, very fast data transport, data storage, wireless engineering, digital electronics, image processing and software development.In 2005, the South African SKA project initiated a targeted “Youth into Science and Engineering Programme” to develop highly skilled young scientists and engineers.“The young people supported by this programme will serve South Africa, and our African partner countries, in the future in key areas of economic development in addition to their participation in ‘blue skies’ scientific research,” says Kim de Boer.The programme offers comprehensive bursaries to students in engineering, mathematics, physics and astronomy at undergraduate and postgraduate level. Bursary holders also benefit from regular workshops and conferences where they interact with the world’s leading astronomers.SAinfo reporterWould you like to use this article in your publication or on your website? See: Using SAinfo material
The Tam Tam Blog mentioned an interesting discussion of Document Level Security in discussion by Mark Bennet at New Idea Engineering.The search result of a document search needs to account for security levels assigned by ACLs to documents in the repository. A given user may be limited to access and search across certain documents.Mark distinguishes between two approaches for document search when security is applied:Early-Binding Security. In this scenario, the query to the back-end repository incorporates ACL permission conditions into the query. This efficiently only returns a set of documents appropriate for that user to see. No post-processing of the data prior to display to the user is required.Late-Binding Security. In this scenario, after the user query is made against the repository, the returned result set is further post-processed to identify only those documents that the user has permission to see. This can obviously be a very time-consuming operation, depending on the number of hits in the query. And if not properly handled, can also cause problems in stating the total number of document hits and how paging between the document results is handled.It’s a good article by Mark describing some of the low level considerations for how to construct the internals of a document/content repository. I was actually surprised to see in Mark’s list some companies that are not using “Early Binding”. The Formtek applications and SDK have always only exclusively used Early Binding.