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Back when the East Perth Power Station was built (around 1916) the powers that be asked a renowned electricity expert what frequency the station should generate at. He recommended 50 hertz, so (naturally) they decided to build the station at 40 hertz.
This was fine for a while, but by the 1940s 50 hertz was established as the standard, and East Perth's eccentric 40 hertz was causing big problems on the power grid. The solution was to build a big-ass transformer to kick the frequency up ten hertz and route the entire station's output through it.
Which is what they did - constructing the frequency switcher building to hold it.
Ain't industrial history grand?
VOS Pace is a new platform supply vessel (PSV) built for the Dutch company, Vroon Offshore Services. The vessel, built at the Cosco Guangdong Shipyard in China, was launched in June 2014 and delivered to her owners in February 2015.
It is the first of the six PX121-type PSVs designed by Ulstein for Vroon Offshore and is outfitted to support drilling activities with longer and deeper boreholes and other offshore activities in European waters.
Storage capacities of the PX121 vessel
The PX121 is equipped with tanks for carrying oil, water and drilling fluids along with two stainless steel tanks for carrying flammable liquids or corrosive chemicals. Onboard tanks can store up to 1,035m3 of fresh water, 1,674m3 of drill water, 1,464m3 of fuel, 1,294m3 of liquid mud or brine and 255m3 of dry bulk. The vessel also features 391.7m3 heeling tanks, and can carry a 257m3 of base oil and 150m3 of methanol.
Accommodation and deck machinery aboard the platform service vessel
VOS Pace is outfitted to provide accommodation to 26 people in 14 single crew cabins and six double cabins dedicated for 12 passengers.
The vessel features two 10t tugger winches with a pulling speed of 35m/min, two capstans with a safe working load (SWL) of 10t each, and a deck crane with a SWL of 3t at a maximum outreach of 18m.
Communication and navigation equipment
Communication systems fitted to the PSV include JRC JSS-2150 MF/HF radio, JRC JHS-770S Very High Frequency Radio (VHF), three Entel HT8982 portable VHF radio for general and distress communications, McMurdo Model E5 Satellite emergency position-indicating radio beacon (EPIRB), JRC NCR-333 navigational telex (NAVTEX) receiver, JRC JUE-251 Fleet Broad Band, and JRC JAX-9B Weather Facsimile.
Other communication equipments fitted on the vessel include Inmarsat-C packet data service operated by Inmarsat for Ship Security Alert System (SSAS) and long-range identification and tracking (LRIT) of ships. The ship also incorporates two McMurdo S4 search and rescue transponders (SART) and JHS-183 Automatic Identification System (AIS).
Navigation equipment includes S-band JMCJMA -9132-SA ARPA radar and X-band JRC JMA -9122-9XA ARPA radar. Also fitted are two Mc Murdo S4 Radar Transponder Units, JRC JAN-901B-FOR Differential Global Positioning System (DGPS), JRC JFE-680 Echo sounder and YOKOGAWA PT500A-P-Analog auto pilot.
The PSV is further equipped with YOKOGAWA CMZ900d +1 x 900S gyro compass, YOKOGAWA SR-165 magnetic compass, Integrated Joystick Control, JRC Navi-Sailor 4000 electronic chart display and information system (ECDIS) with multi-functional (MFD) system, and a JRC JCY-1800 Voyage Data Recorder (VDR).
Life saving and fire-fighting systems
The PSV is fitted with two 20-man life rafts on each side and a man overboard boat (MOB) to carry six people.
"The PSV is fitted with two 20-man life rafts on each side and a man overboard boat (MOB) to carry six people."
External fire-fighting systems of the ABS FiFi Class vessel make it capable of dispersing 3,820m3 of water an hour. Manual fire-fighting equipment include two fire monitors. The high-capacity water jets are capable of releasing 1,200m3 of water every hour to a distance of more than 120m.
Engine and propulsion
VOs Pace PSV is powered by a diesel electric propulsion system comprising of two 1,630kW diesel engines and a pair of two diesel engines generating 990kW of power each.
The propulsion system includes two 1,600kW azimuthing twin propellers and two bow thrusters, each generating 880kW of power. The ship is also fitted with a 130ekW emergency generator set for shipboard electricity. The propulsion system ensures a maximum speed of 15kt.
"f-holes" are an acoustic impedance matching design feature - they help make violins sound louder by more efficiently transferring the energy of sound vibrations from the hard (high density) strings and wood of the instrument to the soft (low density) surrounding air.
From the 10th to 18th centuries, the sound holes of the violin, and its ancestors, evolved from simple circles to more elongated f-holes.
It has been suggested that the changes are the result of a Darwinian evolutionary process. Small variations in the shape of the hole arose from human error by the craftsmen, and better sounding shapes were then selected for next time the sound hole was created. The rate of change of the shape of the hole is consistent with this processes. (Presumably production costs were too expensive for violin makers to just try out different "radical" or "experimental" designs to hasten the process of improvement, and perhaps also buyers were too conservative to demand this type of change.)
Researchers found most of the sound produced from the violin and its ancestors flows through a sound hole's perimeter, not its interior.
Article on the evolution of sound holes showing how they increased their perimeter over time: MIT News: Power efficiency in the violin
From original Paper The evolution of air resonance power efficiency in the violin and its ancestors The Royal Society
"The fact that acoustic radiation from a violin at air-cavity resonance is monopolar and can be determined by pure volume change is used to help explain related aspects of violin design evolution. By determining the acoustic conductance of arbitrarily shaped sound holes, it is found that air flow at the perimeter rather than the broader sound-hole area dominates acoustic conductance, and coupling between compressible air within the violin and its elastic structure lowers the Helmholtz resonance frequency from that found for a corresponding rigid instrument by roughly a semitone. As a result of the former, it is found that as sound-hole geometry of the violin's ancestors slowly evolved over centuries from simple circles to complex f-holes, the ratio of inefficient, acoustically inactive to total sound-hole area was decimated, roughly doubling air-resonance power efficiency. F-hole length then slowly increased by roughly 30% across two centuries in the renowned workshops of Amati, Stradivari and Guarneri, favouring instruments with higher air-resonance power, through a corresponding power increase of roughly 60%. By evolution-rate analysis, these changes are found to be consistent with mutations arising within the range of accidental replication fluctuations from craftsmanship limitations with subsequent selection favouring instruments with higher air-resonance power."
MIJAS NATURAL (Beauty & Hair), Centro de BELLEZA en Mijas Pueblo (Málaga - España) / Estética - Estilismo (Peluquería) - Asesoría de Imagen - Solarium - LPG - Micropigmentación - Fotodepilación - Plataforma Vibratoria - Dietética y Nutrición - Psicología - Técnicas Corporales (Pilates) ift.tt/NtOUix info@mijasnatural.com Tfno. 952 590 823
Arriva, for reasons best known to themselves, have replaced standard buses on route 3 to Bellfields with 16 seat Mercedes minibuses!
And at the same frequency as the big buses too, every 20 minutes.
I don't know the route that well in terms of usage, but somehow I doubt it will be welcomed by those that use it.
Tried this effect once more (freehand). In color this time. I'm done with it now.
One of my current favorite doll, this version of the twins is AMAZING!!!
Kumi is wearing Decorum Eugenia blouse, Spring Forward Eugenia skirt, Giselle Live Work Play handbag, Kyori Rising Sun shoes and FR jewelry.
LOVE <3
Air station radio frequencies, UHF and VHF
U.S. Coast Guard Air Station Sacramento
McClellan, California
HC-27J Spartan (Wikipedia):
en.wikipedia.org/wiki/Alenia_C-27J_Spartan:
U.S. Coast Guard Air Station Sacramento (USCG):
www.pacificarea.uscg.mil/Our-Organization/District-11/Dis...
U.S. Coast Guard Air Station Sacramento (Wikipedia):
Route 489 has a short but complex history.
In brief, it started as a Bookham - Leatherhead - Woodbridge Tesco service, running in competition with Sunray Travel's 479; a supplementary service, creating a new link (to Tesco).
It was then extended to cover the whole of the Guildford - Epsom corridor, covering all of Sunray's 479 (albeit at a reduced frequency). The section to Woodbridge Tesco was kept (as a double run), and the service was also sent into the Levett Road area of Leatherhead (as another double run), replacing the 516 there.
When Sunray Travel collapsed, Excetera took over as main operator - using the number 479 for the full length Epsom - Guildford journeys, and 489 becoming for the Epsom - Bookham shorts. The section to Woodbridge Tesco was axed, with the 479 serving Levett Road rather than the 489.
Things changed again in August 2014, with all Epsom - Guildford corridor journeys being numbered 479 once more, regardless of whether they ran the full length or were Bookham shorts. The 489 went full circle, and became a Bookham - Woodbridge Tesco service, again supplementary to the 479.
March 2015 saw a slight routeing change at Levett Road.
And finally, to October 2015 - when the route was withdrawn.
The last day was 16th October 2015, and here we see PVL210 (S27 ETC, ex-Y801 TGH) at Levett Road - complete with two fellow Flickrites up top!
Last time I was here, prior to the March route change, I left wondering what on earth the change could be. This sussed it - instead of turning right here and fighting with parked cars trying to get back onto Copthorne Road, the service was changed to continue, run around Levett Road anti-clockwise, and then leave via Cressall Mead again.
Following the withdrawal of the 489, a handful of journeys on the 408 (run by Epsom Coaches) have been diverted around here as a replacement.
Levett Road, Leatherhead, Surrey.
The first thing that we did with a new Infinity 12" subwoofer that was purchased (for home, and not lab use), was to hook it up to our frequency generator and put it through a few paces. The sub is rated at 28 to 150 Hz, and, apparently, the resonant frequency of our conference room is approximately 47 Hz. Check out the video of it in action, and see our blog post!