View allAll Photos Tagged Synchronous
Synchronous fireflies in the Allegheny National Forest
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Electrique concept-car of Mercedes showed in Paris Auto show 2016.
This long (5,7 metres long) 2+2 seater is a hommage to the glorious age of the "aero coupe" in the 30's with a modern powertrain: this 4-wheel drive vehicule is composed of 4 compact permanent magnet synchronous electric motors delivered 750HP.
It allows an acceleration from 0-100 km/h under 4s and a range of over 500 kilometers.
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Concept Car de Mercedes-Benz au salon de l'automobile de Paris 2016.
Ce coupé 2+2, mesurant 5,7m de long, est un hommage aux lignes des aéros coupés des années 30.
Il est équipé de 4 moteurs électriques délivrant en tout 750ch permettant une accélération 0-100 en moins de 4s et 500 kilomètres d'autonomie.
'Unweaving the Rainbow'
"My title is from Keats, who believed that Newton had destroyed all the poetry of the rainbow by reducing it to the prismatic colors. Keats could hardly have been more wrong, and my aim is to guide all who are tempted by a similar view, towards the opposite conclusion. Science is, or ought to be, the inspiration for great poetry."
Richard Dawkins, 1998
Funily enough, I took this photograph on 18th June 2007 - and synchronously found Dawkins' book (which is a very good read making a case for 'poetry' in science) in a charity shop for pennies two days later...
These Jezebels don't travel far away from one another as caterpillars and consequently pupate together, often when the foodplant is defoliated. They eclose as adults synchronously also.
'METAMORPHOSIS' matches later instar caterpillars to their adult forms. See other images in the series HERE.
Collage images from Pu'er, Yunnan, China
see comments for additional caterpillar, prepupal and adult butterfly images...
Manufacturer: Chevrolet Division of General Motors LLC, Detroit - U.S.A.
Type: Monte Carlo Series 13800 / 1H57 Sport Coupé
Engine: 5733cc L48 Turbo-Fire small block V-8 (90°)overhead valve (by GM)
Power: 167 bhp / 4.000 rpm
Speed: 175 km/h
Production time: 1970 – 1972
Production outlet: 180,819 (1972)
Production outlet: 439,393 (1970-1972 incl. 5,742 “SS 454”)
Curb weight: 1648 kg
Special:
- "Chevrolet: Building a Better Way To See The USA."
- This first generation "coke bottle styling" Monte Carlo, designed by Elliot Marantette "Pete" Estes and Dave Holls (codenamed “Concours”) and named for the city Monte Carlo in the Principality of Monaco, specifically the ward of Monte Carlo/Spélugues, is built on the same GM A-body platform intermediate-sized cars as the re-designed 1969 Pontiac Grand Prix, is 23 cm taller than the Chevelle, only model was this Hardtop Coupé ( ’72 models were called Sport Coupé), only sold with a V-8 engine (wide choice) and has to compete with the new A-body Pontiac Grand Prix and the Ford Thunderbird.
- Only slight styling updates were made over the years.
- The rather ungainly rear an the 1970 labor strike at the Flint (Michigan) assembly plant, were probably guilty of poor sales, so the 1973 model was completely renewed.
- It has a fully synchronous three-speed manual gearbox, steering column shifter, a Rochester 7041113 dual downdraft carburettor, a 12-Volts electric system, distributor and coil ignition system, a 72 liter fuel tank, a single plate dry disc clutch and rear wheel drive.
- The box frame with crossbars chassis with steel body (by Fisher) has a 116 inch wheelbase, a Cadillac-like eggcrate / grid-textured grille, large, single headlamps mounted in square-shaped housings, hidden wipers, elm-burl dash panel inlays, fake wood trim dashboard, a bench seat , deep-twist carpeting, an electric clock, powered recirculating ball steering, front trapezoidal wishbones, independent ball joint with coil spring front sway bar suspension, longitudinal coil link rear suspension with lower trailing arms and upper differential for leading-trailing arms, telescopic shock absorbers all round, a semi-floating type rear axle, hypoid differential, 6x15 disc wheels, G78x15B bias-belted black sidewall tires, powered 11 inch ventilated disc brakes at the front and 9.5 inch self-adjusting drum brakes at the rear.
- A Turbo-Fire 350 CID 4-barrel carburettor, a 400 CID (6555cc) V-8 engine, a 454 CID (7440cc) V-8 engine , a Monte Carlo SS 454 package (with blacked-out rear body panel, front and rear stabilizer bars, dash controls with international symbol knobs, heavy-duty front and rear suspension, an automatic load-leveling rear suspension, "SS 454" badging, and rubber rear bumper inserts), a four-speed manual gearbox, an Automatic Torque-Drive, a Turbo Hydra-Matic three-speed automatic transmission (only on the SS 454), a two-speed Powerglide automatic transmission, power windows, power seats, variable-ratio power steering, Four Season Air Conditioning, speed control device, fender skirts, a light monitoring system, a four-spoke steering wheel, "rally" wheels, center console, full instrumentation, Strato bucket seats, a higher grade nylon (or vinyl) upholstery, cloth interior, full instrumentation, radio, AM/FM stereo radios with 8-track tape players and two-tone colouring were optional.
- This first generation was assembled at plants in Flint (Michigan), Baltimore (Maryland), Lakewood Heights (Georgia), Kansas City (Missouri), Van Nuys (California) and in Oshawa (Ontario – Canada).
The local Jezebel butterflies are gregarious throughout their life histories, ultimately pupating and then eclosing synchronously.
Pu'er, Yunnan, China
see comments for additional image...
I was lucky to win the lottery for synchronous fireflies event at Great Smoky Mountain in Tennessee, US.
We were taken to little river trail by the shuttle at around 7pm. When I was waiting for the night to come alongside Little River, I suddenly saw the last pieces of sun light penetrated the tree leaves casting on the river.
Many folks ran to the light and went into the river to "take a bath of the sunset". I waited there for more than 30 minutes until I got this shot at around 7:50pm with nobody in the image. And then the sun light disappear in 5 minutes.
Located three miles east of RT 79 outside Olney, here's a cluster of abandoned farm buildings on the north side of the road. I've been visiting this location for a number of years, always shooting from the roadside. This pic was taken as I was leaning against the fence (carefully avoiding the barbs). One building appears to have been cut in half and the sections moved apart. The long shed has definitely been taking a beating from the wind, with sheets of metal peeled back.
Next time I'm in the area I'll ask a few neighbors where I might get permission to photograph around the old sheds. Looking the place over through binoculars I can see a ton of interesting stuff to shoot. This is in a very "snakey" area, plus there are a million places that might hide Africanized Bees, so any hiking around will have to be done VERY carefully.
This was taken early in the afternoon of June 27, 2022, a bright sunny day with the temperature a "relatively cool" 90 degrees. We had been baking for several weeks on this trip to Texas, with most days well over 100 degrees, the worst being an afternoon spent at Peacock with our truck thermometer indicating 112.
Taken with a Nikon D80, Nikon 50mm f/1.8 AI-S lens, with a Kowa 2x Bell & Howell anamorphic lens. This anamorphic requires synchronous focusing of it and the primary lens, where with my Iscorama you leave the camera lens set at infinity and focus with the Iscorama.
DSC-0281 WSK2x
Plano Balloon Festival 2014 #planoballoon
The most popular event of the day occurred after sundown when the participants synchronously and asynchronously lit up their balloons.
It used ~1,800 watts, & made 4 foot streamers at about 75% power, too much for the space available! MMC cap, salient-pole synchronous rotary gap.
Every June there is a week or two when you can witness a spectacular firefly display in Great Smoky Mountains National Park. Photinus carolinus is a very special insect, commonly referred to as a synchronous firefly. Each individual blinks five times in succession followed by a pause. What's remarkable is that large clusters of these insects will synchronize their display and all blink and pause at the same time.
These fireflies display later than typical fireflies (they start at 9:45PM or later) and so photography is extremely difficult. This is a two-minute exposure at ISO 1600 and at f/1.8. The woods were literary flashing with light in an unrivaled display...absolutely breathtaking and something I'll never forget.
She walked briskly past me only giving me a few seconds to get the Olympus out of my kitbag, luckily I had the 75mm f1.8 Zuiko attached. I was immediately drawn to the synchronous colour of her hair and shopping bag.
The EM1 quickly locked on target in C-TR mode so I only needed the one exposure. In fact I didn’t even stop walking, taking the shot on the fly.
The only pp here is a slight crop to eliminate a little too much foreground. Colour set to Natural (the irony isn’t lost on me).
Two species of fireflies in Great Smoky Mountains National Park. The yellowish lights are synchronous fireflies (Photinus carolinus). The long, meandering green streaks are blue ghost fireflies (Phausis reticulata). These don't blink, but instead leave their lights on for up to a minute as they fly above the forest floor. Now, I know what you're thinking: Why are they called blue ghosts if they're green? I can say that they did look bluish-white to my eyes as they flew around; the camera, however, sees them as, well... lime lights. I assumed at first that it was like photographing auroras - perhaps the camera sensor can pick up color wavelengths to which our eyes are less sensitive. But after doing some reading, it's a bit more nuanced than that. It's due to the "Purkinje effect." As part of our eyes' adaptation to seeing in dim light, they shift their luminance sensitivity toward the blue end of the spectrum. Anything around those wavelengths is more visible, whereas colors toward the red end become dim or black. The camera doesn't have this night vision color shift, so it records all the wavelengths with the same sensitivity. Apparently if I had caught a blue ghost in my hand, and held it close to my eyes, the brightness would have overwhelmed my night vision and I, too, would have seen the light as yellow-green.
Happily, Thanksgiving and Autumn colours are pretty synchronous around here, and the kids enjoyed grabbing a bunch of leaves and tossing them in the air: at Mill of Kintail, yesterday.
Closer is even better; click the magnifying glass or press Z.
© Anvilcloud Photography
Please take your time... to View it large on black
The Moon is in synchronous rotation, meaning that it keeps nearly the same face turned towards the Earth at all times. Early in the Moon's history, its rotation slowed and became locked in this configuration as a result of frictional effects associated with tidal deformations caused by the Earth. Long ago when the Moon spun much faster, its tidal bulge preceded the Earth-Moon line because it couldn't "snap back" its bulges quickly enough to keep its bulges in line with Earth. The rotation swept the bulge beyond the Earth-Moon line. This out-of-line bulge caused a torque, slowing the Moon spin, like a wrench tightening a nut. When the Moon's spin slowed enough to match its orbital rate, then the bulge always faced Earth, the bulge was in line with Earth, and the torque disappeared. That is why the Moon rotates at the same rate as it orbits and we always see the same side of the Moon.
Photo taken of the moon's "near side" on 24th December 2007. Using my camera's maximum 18 x optical zoom or 648mm.
De maan is, samen met de zon en de draaiing van de aarde, verantwoordelijk voor de getijdenwerking op de aarde. Deze getijdenwerking zorgt ervoor dat de draaisnelheid (rotatie) van de aarde langzaam afneemt. Van haar kant oefent de aarde ook getijdenwerking op de maan uit, maar wel van een orde grootte sterker. Hierdoor is de draaisnelheid van de maan al zo sterk afgenomen dat zij precies evenveel tijd nodig heeft om om haar eigen as te draaien, als éénmaal om de aarde (synchrone rotatie). Dat verklaart waarom we vanaf de aarde altijd dezelfde kant van de maan zien.
Taken in the Convergence: The Synchronous City roleplay sim in Second Life: maps.secondlife.com/secondlife/CLOCKTOWER/157/236/1707
The woods seemed to be teeming with recently-fledged Crossbills yesterday. You can see that the grey, streaky juveniles look nothing like the colourful adults. They are very early nesters so I would calculate that they must have started incubation in the middle of February. They typically lay four eggs and the female does all the incubation while the male brings her food. Incubation lasts 12-16 days and the young fly about 25 days after hatching. Probably because they typically nest so early in the year when it is cold, the female also broods her newly hatched young but will assist with feeding once they are half-grown. Unusually for finches, they also start to incubate the first egg so that eggs laid over several days will not hatch synchronously. The young are fed on a sort of porridge of chewed-up conifer seeds. Again, this is unusual as most finches switch to an insect diet when feeding young, but there aren't many insects so early in the year. And when I say the conifer seeds are chewed, this is done in the gizzard rather than in the beak. Crossbills eat grit that they store in the gizzard to help macerate the hard seeds. And one final thing, I think this Crossbill is so young that its beak hasn't fully developed its cross yet.
The fourth Spacebus Neo satellite to benefit from ESA’s Neosat programme has launched into space on board the second Ariane 5 launch mission of 2022.
The 8.9 metre, three-storeys-high communications satellite – which will deliver high-speed broadband and in-flight connectivity across Europe for its operator, Eutelsat – weighs 6.525 tonnes and accounted for 99% of the 6.62-tonne launch mass.
Called Eutelsat Konnect Very High Throughput Satellite, it includes several innovative features developed under an ESA Partnership Project with satellite manufacturer Thales Alenia Space.
The satellite was launched at 23:45 CEST (18:45 local time) on 6 September from Europe’s spaceport in Kourou, French Guiana, into a sub-synchronous transfer orbit. This highly elliptical trajectory, which loops from close to Earth to up to 60 000 kilometres away from the planet at an inclination of 3.5°, will enable it to transfer into a geostationary orbit some 36 000 kilometres above Earth.
After reaching geostationary orbit the satellite – the tallest ever built in Europe – will be tested further before it enters commercial service.
The satellite features new antenna deployment and pointing mechanisms used within the antenna tracking system, as well as other innovative features including next-generation batteries and structural panels, all developed under the ESA Partnership Project.
Credits: ESA / CNES / Arianespace / Optique vidéo du CSG - P. Piron
A second image from the Elkmont area of Great Smoky Mountains National Park in June.
www.flickr.com/photos/juddpatterson/2586163362/
Another technically challenging image to attempt due to the dimness of a firefly flash. Through a long exposure I could really bring out the frenzy of the situation in the woods that night. ~5 minutes.
McCormick's Creek State Park, Owen County, Indiana.
Here's what a small grouping of this orchid looks like when in flower. Individual flowers only stay fully open for one day. On a day when flowering takes place, it is synchronous throughout the entire local population. The following day, there will be none or very few in the entire local population that will be in flower. Then there will be a period of days (sometimes a week or two or perhaps even more) before flowering will occur again.
When flowering occurs seems to be associated with a significant drop in the overnight temperature of 5 degrees or more after which flowering occurs about 48 hours later. My attempts at catching them in flower after such a temperature drop have been largely unsuccessful. I guess my understanding of the whole scenario is not particularly good (I've never been good at math!). In any case, I do manage to catch them in flower from time to time, apparently more out of plain luck than anything else.
Two years ago on Aug. 3, 2021, there was a massive regional flowering event that took place with this species since three different persons (me included, again at McCormick's Creek SP) witnessed flowering on that day in three separate Indiana counties in central Indiana. So, whatever triggers flowering can operate on a very large geographic scale!
As you can see from observing the hanging, spent flowers on three of these plants, there had been at least one blooming previous to this one. Based on the number of remaining buds there will be one or two more rounds of flowering yet this year.
1910 Replica 1/2 KW Synchronous rotary gap transmitter. This image was 'Photo of the year' in QST magazine, and used in the 2011 ARRL annual calendar. I retain copyright. Blow the image up and view the rear electrode. It is firing at 1800 arcs per minute. Current in the arc is approximately 1,000 amps.
Our latest customer request released. A coal mine from the Ruhr area. The finished model consists of about 15000 individual parts and can be built partially modular in different modules and is equipped with some details. Included are the PDF building instructions for the large winding tower with the two rope sheaves, the machine house, including rope drive, the chimney and the coal washing building. The rope sheaves can be driven prototypically via a drive in the machine house. A synchronous shaft transmits the power evenly to the lower part of the winding tower. Here, there is also a tension pulley that tensions the rope.
From the coal washing building, the hard coal is loaded onto the trains via a conveyor belt. The conveyor belt is driven and, with the "pieces of coal" attached to it, conveys the feeling of a working plant.
Further information and the PDF-building instruction is here available: en.bricks-on-rails.de/product-page/pdf-anleitung-zeche-be...
The Moon is thought to have formed about 4.51 billion years ago, not long after Earth. The most widely accepted explanation is that the Moon formed from the debris left over after a giant impact between Earth and a Mars-sized body called Theia.
The Moon is in synchronous rotation with Earth, and thus always shows the same side to Earth, the near side. The near side is marked by dark volcanic maria that fill the spaces between the bright ancient crustal highlands and the prominent impact craters. After the Sun, the Moon is the second-brightest regularly visible celestial object in Earth's sky. Its surface is actually dark, although compared to the night sky it appears very bright, with a reflectance just slightly higher than that of worn asphalt. Its gravitational influence produces the ocean tides, body tides, and the slight lengthening of the day.
The Moon's average orbital distance is 384,402 km (238,856 mi),[13][14] or 1.28 light-seconds. This is about thirty times the diameter of Earth. The Moon's apparent size in the sky is almost the same as that of the Sun, since the star is about 400 times the lunar distance and diameter. Therefore, the Moon covers the Sun nearly precisely during a total solar eclipse. This matching of apparent visual size will not continue in the far future because the Moon's distance from Earth is gradually increasing.
The Moon was first reached in 1959 by an unmanned spacecraft of the Soviet Union's Luna program; the United States' NASA Apollo program achieved the only manned lunar missions to date, beginning with the first manned orbital mission by Apollo 8 in 1968, and six manned landings between 1969 and 1972, with the first being Apollo 11. These missions returned lunar rocks which have been used to develop a geological understanding of the Moon's origin, internal structure, and the Moon's later history. Since the Apollo 17 mission in 1972, the Moon has been visited only by unmanned spacecraft.
Both the Moon's natural prominence in the earthly sky and its regular cycle of phases as seen from Earth have provided cultural references and influences for human societies and cultures since time immemorial. Such cultural influences can be found in language, lunar calendar systems, art, and mythology.
Synchronous lateral excitation sounds like something that's only shown on TV after a certain hour but in fact its the physical affliction that gave London's Millennium Bridge its Wobbly Bridge nickname.
Part of the square shots of the Square Mile and a bit and the ministract sets.
dabc 2009
This came about from the question
"What would happen if everyone in the world jumped at the same time?"........!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Synchronous Fireflies !
Manufacturer: Adam Opel AG, Rüsselsheim am Main - Germany / General Motors Company, Detroit - USA
Type: Super Six 2-door Modell 3700 LC4 Cabriolet 4-seats
Production time: November 1936 - November 1938
Production outlet: 46,453 (all models)
Engine: 2473cc straight-6 Opel 2.5 OHV I-head
Power: 60 bhp / 3.600 rpm
Torque: 165 Nm / 1.600 rpm
Drivetrain: rear wheels
Speed: 115 km/h
Curb weight: 1165 kg
Wheelbase: 104 inch
Chassis: steel box frame type 104-A with cross traverses and separate wooden skeleton bodywork and steel casing
Steering: screw (worm) segment steering, from 1938 Gemmer worm & roller
Gearbox: three-speed manual / II and III synchronized / floor shift
Clutch: single dry plate disc with spring dampers
Carburettor: Opel downdraft vertical (Carter licence) with accelerator pump
Fuel tank: 39+5 liter
Electric system: Bosch 6 Volts 72 Ah
Ignition system: distributor and coil
Brakes front: hydraulic drums
Brakes rear: hydraulic drums
Suspension front: independent trapezoidal double-torsion bar stabilizer, "synchronous” reaction strut + Dubonnet springs / shock absorbers (Opel synchro-suspension)
Suspension rear: beam axle in pressed steel housing, stabilizer, longitudinal semi-elliptical leaf springs + hydraulic lever shock absorbers double-acting type
Rear axle: live banjo type
Differential: spiral bevel 4.30:1
Wheels: 16 inch steel discs
Tires: 5.50 x 16 4-ply
Options:
Special:
- The company was founded on January 21, 1863 and began making automobiles in 1899. In March 1929 General Motors bought 80% of the company increasing this to 100% in 1931 and continues as a subsidiary. The Opel family gained $33.3 million dollars from this transaction.
- Opel is GM's largest European brand and with Vauxhall forms GM's core European business.
- The Super Six Series was available as this 2-door Cabriolet, as 4-door Modell 3700 LV Limousine and as 2-door Modell 3700 LZ Coupé-Limousine.
- An interesting detail was the windscreen wiper drive which received its power via a mechanical linkage from the camshaft, a solution which Opel continued to use in post-World War II Rekord models until 1957.
A display of synchronous fireflies (Photinus carolinus) in the Smoky Mountains of Tennessee. Males of these fireflies flash repeatedly all together for 2-4 seconds, then go dark all at the same time for another 8-12 seconds to watch hopefully for any females replying from the forest floor. This image was made by combining a number of 4-second exposures, totaling about 4-1/2 minutes of time. It was shot with a vintage lens, a 1964 Asahi Pentax Super-Takumar 50mm, wide open at f/1.4, attached to my modern mirrorless camera with an adapter. Focus is in on a sliver of the foreground, rendering the points of firefly light behind that as out-of-focus orbs.
"Autumn Arches:" Venerable oak trees arch gracefully in unison in the Prescott National Forest. I had seen these trees on a hillside from a distance for a number of years, and every year I had thought to try to photograph them in the fall, but had always encountered them too late in the year when their leaves were already gone. Finally this fall I had better luck with timing and climbed up to them to inspect them closer. I imagine they must all have bent to the weight of winter snowfalls that may have contributed to their synchronously arching frames.
Manufacturer: Adam Opel AG, Rüsselsheim am Main - Germany / General Motors Company, Detroit - USA
Type: Super Six 4-door Limousine Modell 3700 LV
Production time: November 1936 - November 1938
Production outlet: 46,453 (all models)
Engine: 2473cc straight-6 Opel 2.5 OHV I-head
Power: 55 bhp / 3.500 rpm
Torque: 145 Nm / 1.600 rpm
Drivetrain: rear wheels
Speed: 117 km/h
Curb weight: 1150 kg
Wheelbase: 104 inch
Chassis: steel box frame type 104-A with cross traverses and separate wooden skeleton bodywork and steel casing
Steering: screw (worm) segment steering, from 1938 Gemmer worm & roller
Gearbox: three-speed manual / II and III synchronized / floor shift
Clutch: single dry plate disc with spring dampers
Carburettor: Opel downdraft vertical (Carter licence) with accelerator pump
Fuel tank: 39+5 liter
Electric system: Bosch 6 Volts 76 Ah
Ignition system: distributor and coil
Brakes front: hydraulic drums
Brakes rear: hydraulic drums
Suspension front: independent trapezoidal double-torsion bar stabilizer, "synchronous” reaction strut + Dubonnet springs / shock absorbers (Opel synchro-suspension)
Suspension rear: beam axle in pressed steel housing, stabilizer, longitudinal semi-elliptical leaf springs + hydraulic lever shock absorbers
Rear axle: live banjo type
Differential: spiral bevel 4.30:1
Wheels: 16 inch steel discs
Tires: 5.50 x 16
Options:
Special:
- The company was founded on January 21, 1863 and began making automobiles in 1899. In March 1929 General Motors bought 80% of the company increasing this to 100% in 1931 and continues as a subsidiary. The Opel family gained $33.3 million dollars from this transaction.
- Opel is GM's largest European brand and with Vauxhall forms GM's core European business.
- The Super Six Series was available as this 4-door Limousine, as 2-door 3700 LZ Coupé-Limousine and as 2-door 3700 LC4 Cabriolet 4-seats.
- An interesting detail was the windscreen wiper drive which received its power via a mechanical linkage from the camshaft, a solution which Opel continued to use in post-World War II Rekord models until 1957.
- There are about 200 known survivors.
Photographed at a yard sale upon the recent serendipitous** spying of them by Miss Boots synchronously with her triumphant metamorphosis into the exquisite Myth Shiraluna.
WIP of Eilun before he climbed down the last time. Character from Convergence: the Synchronous City. See more at: convergence.enjin.com/
ESA’s Characterising Exoplanet Satellite, Cheops, is shown here as a long streak against a backdrop of stars as it orbits the Earth after its successful launch on 18 December 2019.
The 6-minute long exposure was taken at 13:18 UTC on 11 January 2020 with the 1-m SAINT-EX robotic telescope, located at the National Astronomical Observatory of Mexico at San Pedro Martir, Mexico.
The coordinates of the centre of this 2048 x 2048 pixel image are: right ascension 11h 56m 58.00s and declination +27º 30’ 45.0’’ (J2000). The visible trail seen running from bottom to top in the image is due to sunlight reflected by the Cheops spacecraft, which is in a sun-synchronous orbit with an altitude of 700 km and a local time of the ascending node of 6:00am.
The image spans only 12 arcminutes across, so Cheops spent a very short time in the field of view – around 400 ms. The estimated r’-band magnitude of CHEOPS in this image is 7.8 ± 0.3 (calculation by M. Sestovic, University of Bern).
Credits: Courtesy of the SAINT-EX team, University of Bern
Millennium Bridge, Southwark, London - England / October 2011
© Copyright 2011 Mario Rasso
All Rights Reserved. Please contact me, if you are interested in using my work
e-mail: mariorasso@yahoo.com
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The bridge's movements were caused by a 'positive feedback' phenomenon, known as Synchronous Lateral Excitation. The natural sway motion of people walking caused small sideways oscillations in the bridge, which in turn caused people on the bridge to sway in step, increasing the amplitude of the bridge oscillations and continually reinforcing the effect.[4] On the day of opening the bridge was crossed by 90,000 people, with up to 2,000 on the bridge at any one time.
Resonant vibrational modes due to vertical loads (such as trains, traffic, pedestrians) and wind loads are well understood in bridge design. In the case of the Millennium Bridge, because the lateral motion caused the pedestrians loading the bridge to directly participate with the bridge, the vibrational modes had not been anticipated by the designers.
The lateral vibration problems of the Millennium Bridge are very unusual, but not entirely unique.[5] Any bridge with lateral frequency modes of less than 1.3 Hz, and sufficiently low mass, could witness the same phenomenon with sufficient pedestrian loading. The greater the number of people, the greater the amplitude of the vibrations. Other bridges which have seen similar problems are:
▪Birmingham NEC Link bridge, with a lateral frequency of 0.7 Hz
▪Groves Suspension Bridge, Chester, in 1977 during the Jubilee river regatta
▪Auckland Harbour Road Bridge, with a lateral frequency of 0.67 Hz, during a 1975 demonstration[6]
After extensive analysis by the engineers, the problem was fixed by the retrofitting of 37 fluid-viscous dampers (energy dissipating) to control horizontal movement and 52 tuned mass dampers (inertial) to control vertical movement. This took from May 2001 to January 2002 and cost £5m. After a period of testing, the bridge was successfully re-opened on 22 February 2002. The bridge has not been subject to significant vibration since. In spite of the successful fix of the problem, the affectionate "wobbly bridge" epithet remains in common usage amongst Londoners.
An artistic expression of the higher-frequency resonances within the cables of the bridge were explored by Bill Fontana's 'Harmonic Bridge' exhibition at the Tate Modern museum in the summer of 2006. This utilised acoustic transducers placed at strategic locations on the cabling of the Millennium Bridge and the signals from those transducers were amplified and dynamically distributed throughout the Turbine Hall of the Tate by a program Fontana entered into the sound diffusion engine of the Richmond Sound Design AudioBox.
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Synchronous - Thames Barrier, London, UK
We were just finishing the Seine boating when the lights lit up - no one could resist taking a snapshot.
For a split second all that one could hear was the echoing "Woooow" spreading through the moment in a zillion voice colors.
I still don't know what astonished me most: the sight in-front of me, the cinematic sound effect of the gathered tourists exclaiming synchronously or a mixture of it all.
I had collected this leaf with eight chrysalises on board without knowing what would emerge and the consequent eclosures were as much a surprise as magnificent.
These Jezebel butterflies don't travel far away from one another as caterpillars and consequently pupate together also. This leaf had eight chrysalis on it and because they usually pupate at the same time, often when the foodplant is defoliated, they emerge as adults synchronously also.
Taken December 7, 2011
Home Studio
Pu'er, Yunnan, China
(The enforced hiatus from photo-taking due to the predictably unpredictable weather continues, so I intend to continue some reposts though this time of what I consider my favourite twenty images (in no particular order and in batches of five). I have now surpassed 10000 images in my photostream, so have plenty to choose from. Invariably, these will not be images that have been particularly well received on their initial appearance in my photostream, but have significance to me maybe because of the circumstances related to their capture, as images I have a sentimental, nostalgic and/or emotional connection to or perhaps just what I consider to be a good shot.)
see comments for additional view…..