Offshore Experience

By on March 28, 2008 · Filed under: culture, engineering · 0 Comments

I just got back from my first interesting taste of the offshore life. I spent three nights on a fixed platform surveying for a project I am currently working on. I’ll be honest and say I’d heard a few horror stories about life offshore but for me this experience was a good one. The cabin was very comfortable (personal TV and a bunk even I could fit into) and the food was both generous and of good quality, and of course the views on the walk to work were something special, as seen in this image below.

North Sea

It was good but I’m not sure I could do the two weeks on-two weeks off thing. It’s obviously very important to develop a good camaraderie with your fellow crewmates because otherwise evenings are spent either reading (currently Kafka On The Shore by Haruki Murakami as a break from Russel’s History of Western Philosophy) or watching television. The TV did come with a DVD player so perhaps next time I can take along a few discs and catch up on Stargate Atlantis, my current favourite (in the absence of new Battlestar Galactica) sci-fi show.

The Twilight Sad Live

By on March 22, 2008 · Filed under: gig, music · 0 Comments

The Twilight Sad in AustinThe Twilight Sad, as portrayed on their debut album Fourteen Autumns and Fifteen Winters are an intriguing, oftentimes melancholic proposition. Their vast songs, built up through intricate layers of guitar, take you on a trip into the brooding psyche of lead singer James Graham. As a live band last night at Moshulu in Aberdeen, they were quite a different proposition. Yes they were enigmatic to the point of disinterest, but it was their sound, stripped of all the wizardry of the recording studio that made the real difference. Spartan arrangements eventually developed into reverb-fuelled overdriven epilogues that unfortunately seemed to sap the enthusiasm from the audience.

That isn’t to say the set didn’t have its good moments, with the strong tracks from the album truly shining even in this difficult setting. When they did hit their stride their grandeur and talent for bewitching vocal melodies really did seem to work. The opening of Cold Days From The Birdhouse was a particularly spine-tingling moment as James Graham howled the line “And your red sky at night won’t follow me”. I think even the conversations at the bar were almost muted by it. Indeed I think if the crowd had been more into it the band would have risen to the occasion, but the loud drunk dancing somewhere near the front seemed to put them off their stride, and though the last couple of songs were amongst the best of the evening it did seem something of an anti-climax as they disappeared from the stage leaving only the feedback in their wake.

The support bands put on solid performances, with Kartta warming their home crowd up nicely and displaying a promising talent for textured and energetic hand-clap driven indie, whilst visitors Her Name Is Calla, from Leicester, had a couple of decent tracks, only slightly ruined by their need to scream at the climax of a couple of tunes. The use of trombone as a rock instrument has to be applauded though and they’d be worth checking out as a future name.

Altogether the gig had a feeling of not really achieving its potential and as I walked home through the snow that barely had the inclination to settle it seemed the world was generally sharing the mood.

The Fungle Road

By on March 16, 2008 · Filed under: mountains · 0 Comments

Today I went on my second outing with the Stocket Hillwalking Club. The day started at 8am with quite a squeeze onto a tiny bus with 26 other keen walkers. We had a somewhat bumpy ride out south and west of Aberdeen to the remote Glen Esk where after a cry of “stop!” from most of the bus we were dropped off in the tiny hamlet of Tarfside at the southern end of The Fungle Road.

This is an old drover’s road across the hills of the Mounth, initially used for moving cattle and more recently for whisky smuggling, and we were to walk the length of it to its end in Aboyne on Deeside.

The first part of the walk took us away from Tarfside and across some exposed moorland, dotted with grazing sheep and the occassional farmhouse. In front of us the hills of the Mounth, including Gannoch opened up, and behind us we could see that the higher hills over towards Glen Clova were snow-covered.

Stocket Scene

After a slight navigational error due to a relocated forest end and a newly built house we started to climb up the slopes heading to a pass between Tampie and Mudlee Bracks. Here we met the Firmounth, another right of way which comes over the hills from Glen Tanar. The signpost, a sign of civilisation on a barren hillside, was a good place to stop for pictures and a panoramic view over Glen Esk, Glen Clova and towards the hills above Glen Tanar (though Mt Keen was lost in the clouds). At this stage of the day, though very windy in the open, the sun was shining, and our tea stop was particularly pleasant as we sat by the track with the hillside to shelter us.

We then pushed on, walking through the pass and entering the Cairngorm National Park. A narrow path, freshly sand-covered, now dropped down steeply with a burn flowing in a narrow defile below us. We had an entertaining time jumping or fording the small streams that came off the hillside but eventually made it down to our lunch stop at Birse Castle, a remote farming community in a small valley between the two lines of hills we were crossing.

The Road Goes Ever On

After lunch in the sunshine we now climbed out of this second valley, traversing a somewhat rickety bridge and climbing up on a wide landrover track. As we pushed on across the hilltop a thick veil of rain slowly covered the valley to our east and seconds later the first drops were hitting us, prompting hoods up against the unpleasant conditions. Shelter was sought at a hunter’s bothy and no sooner had water proof trousers been donned did the sun reappear.

Following the track a short way we came to the edge of the Forest of Birse where the landrover track was left behind and we descended quickly through an old pine wood, the ground springy underfoot and encouraging us to a good pace.

After a final tea stop we quickly walked the final three or so kilometres down into Aboyne, leaping another stream, dropping down past a viewing point and eventually crossing the Dee before seeking warmth and a well-earned pint or two at the Boat Inn.

Active Galactic Nuclei – A Talk by Prof. Ian Robson

By on March 11, 2008 · Filed under: astronomy · 0 Comments

Professor Ian Robson, Director of the UK Astronomy Technology Centre in Edinburgh, kindly came up to Aberdeen this evening to give an interesting and engaging talk on a specialist subject of his: Active Galactic Nuclei.

Moving from the study of galaxies with unusually bright nuclei by Carl Seyfert in 1943 through to the early sixties when Quasi-Stellar Radio Sources (Quasars) were discovered we were introduced to the full and diverse catalogue of massively bright objects that have been observed. Quasars in particular gave a clue as to the magnitude of this activity. These were faint sources, initially of radio emissions, which when looked at more closely turned out to be huge distances away (measured in redshift rather than kilometres) putting their absolute magnitude up so high that they quickly took over as the brightest objects ever discovered. As more intensive studies were made of these objects it was found that they weren’t stellar at all, but the nuclei of galaxies that completely dwarfed any light given off by the rest of the galaxy. Some were found to have jets of material streaming from them and in general the catalogue of these massively bright objects continued to expand, confounding astronomers.

Conventional understanding of stellar energy processes could not explain the massive energy output seen from these objects, particularly as it was being emitted across a broad section of the electromagnetic spectrum, from gamma rays to radio waves. It was established that the most likely explanation was a black hole, one many times more massive than the sun, a type which were described as supermassive black holes by Martin Rees. The theory goes that the supermassive black hole is surrounded by an accretion disk made up of dust and gas and other materials. When material from the disk interacts with the black hole there is a very efficient conversion of energy from kinetic and potential to radiation. There are further emissions from the disc itself which heats up due to the dynamic forces prevalent on it. It is theorised that much of the emissions are absorbed by a further layer of surrounding, cooler material, thought to be toroidal in shape so that the black hole can only be seen from above and below but not from the side.

The different types of AGN observed are thought to be dependent on the amount of energy being emitted (i.e. accretion disk composition and dynamics) and the orientation of the black hole with respect to the observer. Quasars and blazars are thought to be orientated such that we are looking almost straight down onto the black hole and therefore seeing virtually unimpeded emissions, whilst Seyfert Type 2 galaxies are where we are looking perpendicular to the edge of the torus and the accretion disk meaning that we are seeing re-emissions rather than the bright primary emissions from the black hole.

Ian then went on to discuss non-active galactic nuclei such as those possessed by most large galaxies in our neighbourhood, including our own Milky Way galaxy. Observational evidence suggests that there is a supermassive black hole at the centre of our galaxy, but we do not see the bright emissions associated with a typical AGN. He showed the compelling evidence for Sgr A* to be a supermassive blackhole and explained its quiescent behaviour by saying that the black hole was devoid of material in its close vicinity. Without a fuel supply essential this enormous engine would not display the same level of activity seen in Active Galactic Nuclei. He suggested this was part of galaxy evolution and that astronomers have found AGNs to be much more prevalent in the early Universe than in the current epoch.

This discovery suggests that super massive black holes formed early on when the conditions for luminous AGN were more readily available. This is likely because there was a much higher availability of cold gas near the centre of galaxies than there is now. He also went on to suggest that there is no reason why our Galaxy could not once again become an AGN, given a big enough disturbance. This would most likely happen when the Andromeda Galaxy collides with the Milky Way in the distant future. He showed several simulations of galaxy mergers indicating that this was the type of disturbance necessary to set-up the conditions for an AGN.

Altogether it was an excellent talk, delivered clearly and concisely by someone who is clearly intimately familiar with the subject matter and gave me several insights into these fascinating objects.

Glen Callater and Carn An Tuirc

By on March 1, 2008 · Filed under: mountains · 0 Comments

With the forecast promising everything from clear skies right through to blizzards and howling winds I wasn’t quite sure what to expect when I set out for Braemar this morning. In the end I got a later bus as the winds were ferocious at 6:30am in Aberdeen and this seemed to be a good move as it was sunny and relatively clear as we headed west up Deeside. Of course it didn’t last and by the time the bus pulled into Braemar the skies were steel-grey and a steady stream of sleety snow was falling from them. Not wanting to waste a 2 hour bus ride I stocked up on Cadbury’s Fruit & Nut bars before heading out of the village and south down the A93.

Glen Clunie

Although Glen Clunie was somewhat lost in the murky conditions I only had to head a mile or so down it before turning into Glen Callater at the bridge near Auchallater. Things immediately looked up with the light considerably brighter and the snow left behind to trouble Braemar. Immedaitely away from the main road the scenery became wilder with the Callater burn jumping down over rocks and stones, and above it the grey, bare shoulders of the hills rising up.

The track wound its way up Glen Callater with the hills rising into dramatic mountains that crowded round the head of the Glen. Over to the right was the domed shape of Carn An Tuirc with a healthy covering of snow on its crown. I stopped for a mug of tea and a bite to eat on the shore of Loch Callater, a thin loch between the encroaching hills, the surface of which was being rippled by the wind which had steadily been picking up.

Top of Glen Callater

After donning another layer I headed up away from the Loch, climbing steeply up onto the shoulders of Carn An Tuirc. After the first climb the land flattened slightly and I crossed a patch of moorland between the heights where the first snow was encountered. After this the climb began again, heading up to a cairn where the track disappeared. I now headed off across the broad ridge of Carn An Tuirc, still climbing and heading for what I thought was the summit ridge. There was still plenty of snow so the way was good but the wind was ferocious, blowing snow across the surface. On reaching the Cairn I discovered that it was a false flat and the summit lay a few hundred meters beyond, slightly higher up. Evaluating the conditions I decided it was best not to push for the top, but descended down a good run of snow back to the moorland where the snow finished and I had to pick my way through a boggy area of streams and small pools.

Summit of Carn an Tuirc beyond

I was now heading west with the ski center on the Cairnwell clearly visible in the sunshine. Over to my left beyond the far shoulder of Carn An Tuirc was Glas Maol. Below me the A93 snaked its way up towards Glen Shee and it was for this that I headed, descending by the side of the burn that cascaded down in a nice series of rapids.

Late Afternoon in the Highlands

On gaining the road I then walked the six or so miles back up to Braemar, enjoying the late afternoon sunshine and the Glen as it opened out before me. I got back in time to get the 5pm bus back from Braemar, glad of the chance to rest my feet which were weary from walking on tarmac for so long.

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