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publié le 9 février 2018 Beauté › Cheveux

Prices start at around £869 for the entry-level model reviewed here, which has an Ivy Bridge Core i5 processor running at 1.7GHz, along with 4GB of memory and 128GB of solid-state storage. Its score of 4570 when running PCMark 7 is more than adequate for running productivity apps and performing web browsing duties, although its limited battery life – just four hours and 10 minutes of streaming video – cries out for that Haswell update.The MacBook Air is the "Ur" Ultrabook: the one that defined the category even before Intel’s marketing ‘droids came up with a name for it. However, the 2013 edition is starting to show the line’s age a little.It’s certainly neither the slimmest nor lightest laptop around, and the 1440 x 900 resolution of the 13-inch model is looking a bit dated – as is that wide metal bezel that runs right around the edge of the screen.The limited connectivity remains an annoyance too, with just two USB 3.0 ports and no Ethernet, which gives Apple an excuse to charge through the nose for extra adaptors that many of its rivals give you for free. Even so, the sheer quality of the Air’s one-piece aluminium design is still hard to beat, and at just 1.35kg and 17mm thick it remains a delight to carry around and use.

And, crucially, this year’s Haswell update also taught this old dog a new trick that outweighs all those criticisms: the 13-inch MacBook Air can now deliver a full ten hours of streaming video, and more casual web use should allow you to keep going for at least 12-13 hours.And while the MacBook Air is by no means cheap, its starting price of £949 for a Haswell Core i5 running at 1.3GHz, 4GB of memory and a 128GB solid-state drive doesn’t look too bad alongside its Windows Ultrabook rivals.Microsoft has turned its guns on the Google Chromebook as the "Scroogled" campaign enters its nastiest phase yet.Redmond has hired the stars of a reality television show called Pawn Stars to help with its anti-Google Scroogled campaign.In an imitation of an episode of the show, a reality programme about the colourful characters who pawn their goods at a local broker, the ad features a woman entering the pawn shop and asking how much her laptop is worth, because she wants to buy a ticket to Hollywood.

"This isn't a real laptop," one says. "It doesn't have Windows, it doesn't have Office. Without Wi-Fi it doesn't do much at all and when you are online, Google tracks what you do so they can sell ads. That's how you get scroogled."It's not the first preemptive strike against a rival for Microsoft during Black Friday month. As well as having a go at Google, it has revived a battle with its old enemy Apple in a bid to boost sales of its ailing fondleslab, the Surface 2.Its Scroogled campaign has previously aimed to "raise awareness" of the various ways Google uses people's personal data to make money. With 802.11ac Wave 2 due for ratification in December, El Reg had a talk to Cisco's Andrew Myles, Manager of Protocols in the Borg's Wireless Network Business Unit, to get a handle on one of its more interesting characteristics: MU-MIMO.Myles, who's been around the wireless scene since the near end of the 1980s, reminded Vulture South that the next couple of years will see a replay of the same “how fast does it really go” arguments that have plagued the networking market since we were still using dial-up modems.

The biggest of big numbers that get talked up in 802.11ac are speeds you won't see any time soon – if ever.As always, people like to highlight the transmission rate at the PHY layer, which is always subject to a protocol overhead discount, even though 802.11ac has vastly improved the overhead compared to its predecessors.As long as both transmitter and receiver have multiple antennas, and as long as there's path diversity so that Stream 1 has a slightly different travel time to Stream 2 and Stream 3, that works just fine.The speeds that get hyped in 802.11ac are 3.47 Gbps for Wave 1 systems and 6.93 Gbps for Wave 2 at the physical layer (which shouldn't be used in sales documents) and user throughput of 2.4 Gbps for Wave 1 and 4.9 Gbps for Wave 2. To get those admittedly-blistering throughput numbers you'll need access points and client devices that can handle eight spatial streams and channels of 80 MHz (Wave 1) or 160 MHz (Wave 2).

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Even with products that can run eight spatial streams, you also need a favourable environment. The easiest way to visualise the spatial streams is as reflections that take slightly different paths between transmitter and receiver, arriving at slightly different times (this isn't entirely accurate, as we'll see, but it will do for now).In an uncluttered outdoors environment, with a receiver 100 metres from the transmitter and no path diversity between the two, you won't see 802.11ac working at the multi-gigabit rates touted for it by those who only ever look at the phastest, sorry fastest, physical layer transfer rate.However, 802.11ac Wave 2 brings something cool to the WiFi world that will have a material impact on the modern user's experience: Multi-User MIMO (MU-MIMO).Today's MIMO devotes all of the spatial streams to one pair of MAC addresses: four antennas in the AP create four spatial streams to four antennas in the client (for example, a laptop).

MU-MIMO, on the other hand, allows the access point to split its resources, putting different data on different spatial streams.To do that, the 802.11ac standard adds some neat tricks of beam-forming to the physical layer, and I have to abandon the “reflection” metaphor. What the access point does is to use the way signals interact between different antennae, allowing it to form moderately-directional “lobes”.In an operation called “null steering”, the access point also minimises User 1's signal in the direction of the other users.Alas: MU-MIMO only works in the download direction, because the necessary diversity of antenna location is very hard to achieve in something like a mobile phone or tablet. And it doesn't work at the highest rates of modulation, because the diversity isn't perfect – different users' traffic will experience some noise from each other.

You could observe that this isn't much benefit to the end user: in an environment where multiple devices are competing for download capacity, they get a slower channel, regardless of whether it's because their all contending for the same capacity, or it's getting spatially muxed between them.However, MIMO assumes multiple antennas at both ends of the exchange – fine if the receiver is a laptop, with at least some real estate available, but not feasible in a mobile phone. So MU-MIMO lets the base station take advantage of the extra spatial resource to spread its available spatial channels across those clients.Note that the MU-MIMO only works in the download direction, since your average mobile phone can't do all that cool beam-forming stuff with only one antenna. It was operatives at British intelligence agency GCHQ who cracked the password on the laptop of "determined paedophile" Ian Watkins, a court heard on Tuesday.The evidence heard in court related to child abuse images held in cloud storage, whose password the GCHQ unit had to "crack" to gain access to them.

Ian Watkins, 36, from Pontypridd in Wales, pleaded guilty to 13 sexual offences, including two of attempting to rape a baby, at a hearing at Cardiff Crown Court. He denied a charge of rape.He also pleaded guilty to three counts of sexual assault against children, seven involving possessing images of child abuse and one of possessing an extreme pornographic image involving a sex act on an animal.Two women accused of facilitating the offences by Watkins, the former lead singer of alternative rock band Lostprophets, also made last-minute guilty pleas at the same hearing, after a jury had already been sworn in for a planned trial. Their pleas mean that a trial will not take place."You have been saved from having to watch extremely graphic and distressing material," the BBC reported Mr Justice Royce as telling the court.

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The women cannot be named for legal reasons. The first woman, whom the court called "Woman A", admitted the attempted rape of a baby and two charges of sexual assault as well as taking and distributing an indecent photograph of a child. She denied a charge of rape.The second, "Woman B", pleaded guilty to conspiring to rape a child, three sexual assault charges and four charges of taking, possessing or distributing indecent images.The attempted rapes, which took place in a hotel room in London's Shepherds Bush in April 2012, were captured on video and uploaded to a cloud storage facility. Government security service GCHQ cracked the password to allow access to Watkins' files, according to court reports (Wales Online and The Guardian).The National Technical Assistance Centre of ‪GCHQ‬ provides assistance to police in such cases, the privacy advocacy and government surveillance monitoring Spy Blog notes.

In a statement by South Wales Police, Detective Chief Inspector Peter Doyle, senior investigating officer, said two young children had already been removed from abuse as part of the ongoing investigation. He said investigators would continue to seek out other potential victims. The UK's specialist child protection police unit (CEOP), interpol and the US Department of Homeland Security have all contributed to the investigation, he added.The investigation has been extremely complex and challenging with key information and evidence being identified from witnesses worldwide. A significant amount of electronic data has been retrieved from computers and web based storage which has provided crucial evidence to support the case.South Wales Police has worked in partnership with Interpol, other police forces, the National Crime Agency’s CEOP, local authorities in England and Wales, the Department of Homeland Security in the USA and the NSPCC.

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