President elect Buhari, pictured above as he arrived the Nnamdi Azikiwe International Airport at 5.20am.
Thursday 28 May 2015
President elect Buhari arrives Nigeria
President elect Buhari, pictured above as he arrived the Nnamdi Azikiwe International Airport at 5.20am.
Lagos govt cancels movement’s restriction for May 30th sanitation
The Lagos state government has cancelled restriction of movement during Saturday May 30th environmental sanitation exercise in the state.
While announcing the cancellation, the Commissioner for Environment, Tunji Bello said the cancellation is to enable residents of the state participate fully in all activities lined up to celebrate the inauguration of the president-elect Muhammadu Buhari and the Lagos state governor elect, Akinwunmi Ambode.
"The Lagos State Government has cancelled restriction of human and vehicular activities during the May monthly sanitation coming up this Saturday as the state prepares for the swearing-in/inauguration ceremony of the new governor. This cancellation is to allow for a hitch-free swearing-in and inauguration coming up both in Lagos and Abuja. The restriction of movement was lifted in order to allow full participation of our people during the state and national inauguration ceremonies. The restriction of movement was lifted to also allow easy transportation of fuel from the various tank farms from Lagos to other parts of the nation, as well as allow normalcy to return to our roads. The next edition of the cleaning exercise will come up in June.”he said
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More photos: Buhari with his daughter Zahra & son as he arrived Nigeria
Zahra and her brother pictured with their dad as he arrived back in Nigeria this morning
Sunday 4 August 2013
‘Design for Demise’ ITT issued, aiming for safer satellites
24 July 2013 What goes up must come down – except in space. When a space mission is due to reenter Earth’s atmosphere the aim is that it does not survive the plunge to the ground in fragments large enough to potentially injure anyone.
Since April 2008 all ESA satellites – and launcher upper stages used to deploy them – due to be disposed of by atmospheric reentry at the end of their operational life must demonstrate that the risk from fragments surviving reentry to cause casualties on the ground is less than one in 10 000.
The concept involved is called ‘Design for Demise’: the intentional design of space system hardware so that it will completely burn up – or ‘ablate’ – during uncontrolled atmospheric reentry as a means of post-mission disposal.
This design methodology is especially required for uncontrolled reentry, which would otherwise pose a hazard to public safety, whether on the ground, in the air or on the sea.
Ensuring ‘Design for Demise’ requires knowledge of material properties. In the past spacecraft propellant tanks – made of high-melting point materials like titanium or stainless steel – have proved most likely to survive reentry. Leftover propellant may sometimes remain in these tanks, adding to the potential risk to life.
Any heavyweight space system making wide use of materials that would not be consumed during reentry may not comply with ESA debris mitigation requirements. In such cases, a design that allows disposal by controlled reentry becomes mandatory.
As part of ESA’s Clean Space initiative, the Agency has issued an Invitation to Tender aimed at companies interested in Design for Demise: ‘Characterisation of demisable materials.’ The ITT package is accessible via EMITS (Electronic Mailing Invitation to Tender System) for any registered company. Otherwise follow the link (http://www.esa.int/About_Us/Industry/Industry_how_to_do_business/ESA_s_Invitation_to_Tender_System_EMITS) to register.
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Aircraft tracked
13 June 2013 ESA’s Proba-V has become the first satellite to pick up aircraft tracking signals, allowing aircraft across the globe to be followed in flight from space.
“We have succeeded in proving that these relatively low-powered air traffic control signals can indeed be detected from space as they are, without any need for upgraded aircraft equipment,” explained Toni Delovski of the DLR German Aerospace Center, overseeing the experiment.
“Now we want to go on and check how many aircraft we can actually observe in practice, and which types – different sized aircraft being assigned systems with differing signal strengths.
“This research opens the way to operational space-based aircraft monitoring in future.”
Detecting aircraft in vicinity of Europe Launched on 7 May, Proba-V’s main task is to map vegetation growth, covering the whole world every two days. But the minisatellite – smaller than a cubic metre – also doubles as a miniature research lab, testing a number of promising technologies in space.
These ‘guest payloads’ include an experiment to detect Automatic Dependent Broadcast – Surveillance (ADS-B) signals from aircraft, contributed to the mission by DLR in cooperation with Luxembourg’s SES TechCom.
ADS-B signals are regularly broadcast from equipped aircraft, giving flight information such as speed, position and altitude. All aircraft entering European airspace are envisaged to carry ADS-B in the years ahead.
ADS-B ground systems are currently deployed as an add-on to ground-based radar monitoring for air traffic management.
“However, for most areas of the world, in particular oceans and remote regions, installing air traffic infrastructure based on radars or ADS-B stations is not economically or technically feasible,” Mr Delovski added.
“Instead, space-based ADS-B monitoring holds a lot of potential in terms of security and safety – including search and rescue for airspace not covered by ground-based surveillance. Filling in these gaps has obvious value.
Detecting aircraft along Australian east coast “Moreover, it may allow aircraft to traverse regions with decreased separation between them and on more efficient routes, boosting overall traffic capacity while cutting fuel consumption and carbon dioxide emissions.”
“This is another success for ESA’s Proba series, dedicated to providing early flight opportunities to promising European technologies,” added Frédéric Teston, overseeing the Proba series of satellites as part of ESA’s Technology Flight Opportunities Programme.
Currently undergoing commissioning in orbit, Proba-V is a miniaturised ESA satellite tasked with a full-scale mission: to map land cover and vegetation growth across the entire planet every two days.
It is the latest addition to the Proba family of small, low-cost space missions, giving flight experience to promising European technologies. So along with hosting its main instrument, Proba-V also provides early test flights for a variety of advanced guest payloads.
These include a pair of novel space-radiation detectors, a radio amplifier using the high-performance gallium nitride semiconductor and lightweight high-capacity optical fibre connectors.
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High-tech hitchhikers
Alphasat carries a quartet of test technologies24 July 2013 Ready for launch tomorrow, Alphasat – Europe’s largest telecommunications satellite – will serve as a testbed for advanced space technologies at the same time as it works on its day job as part of the Inmarsat satellite fleet.
Developed through a public–private partnership with Inmarsat, the 6.6 tonne Alphasat is the first flight of the new ‘Alphabus’ European telecom platform.
At the same time Alphasat is also flying a quartet of ‘technology development payloads’ – a pair of them conspicuous in gold- and silver-coloured multilayer insulation here, against this face of the satellite’s predominantly black covering.
The higher up of the two gold-wrapped packages is a Q/V-band payload to investigate the viability of higher frequencies for radio communications as existing frequency bands become progressively overcrowded. Developed by Italy’s ASI space agency, the payload was recently renamed for its late inventor, Aldo Paraboni.
Just above it is a black box housing an environmental testing and radiation sensor. Provided by Efacec in Portugal, the sensor tests electronic components and solid-state memory devices against space radiation.
To the right of this is an experimental startracker, a standard device for attitude control that images constellations to deduce a satellite’s orientation.
Developed by Jena Optronik, this startracker incorporates ‘active pixel sensor’ technology – also the basis of modern digital and smartphone cameras – that combines decreased power requirements with increased robustness for smaller, more powerful imagers.
Below it, the second payload wrapped in gold insulation is an advanced laser communication terminal, capable of locking onto rapidly moving satellites in low orbits thousands of kilometres beneath Alphasat’s fixed geostationary position and receiving up to 1.8 gigabits of data per second.
Developed by Tesat in Germany and furnished by Germany’s DLR space agency, this terminal is trialling technology to be used for ESA’s pair of European Data Relay System satellites later in the decade, establishing a data highway that will be employed in turn to relay results from ESA’s Earth-observing Sentinel satellites to end-users.
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