curiosamathematica

curiosamathematica:

Impossible to ride a square-wheeled bike?

Maybe hard to believe, but square wheels can move smoothly (with their axles in a straight line and at a constant velocity), if they roll over evenly spaced bumps in the shape of an inverted catenary.

Not only squares, but also lots of other interesting shapes can be used as wheel, as long as the shape of the road is appropriate. For instance, for cardioid-shaped wheels you need cycloid-shaped roads:

It’s not about reinventing the wheel, it’s about reinventing the road.

(http://mathtourist.blogspot.be/2011/05/riding-on-square-wheels.html)

derrickbollin
derrickbollin:

Kandi Technologies is a company based in Hangzhou, China that wants to challenge the idea of traditional car ownership. In a country where air pollution is a serious environmental and health hazard, the company has created a giant vending machine that allows citizens to rent electric vehicles on an hourly basis. With a fleet of more than 100,000, Kandi already has plans to expand to other cities this year.
The giant vending machines, which are already operational in some part of Hangzhou, can hold between 30 and 300 cars each, and give you access to an electric vehicle for just $3.25 an hour. Built in partnership with Geely, the cars have a range of 75 miles and can reach top speeds of 50 mph – which is more than enough within most city limits.

derrickbollin:

Kandi Technologies is a company based in Hangzhou, China that wants to challenge the idea of traditional car ownership. In a country where air pollution is a serious environmental and health hazard, the company has created a giant vending machine that allows citizens to rent electric vehicles on an hourly basis. With a fleet of more than 100,000, Kandi already has plans to expand to other cities this year.

The giant vending machines, which are already operational in some part of Hangzhou, can hold between 30 and 300 cars each, and give you access to an electric vehicle for just $3.25 an hour. Built in partnership with Geely, the cars have a range of 75 miles and can reach top speeds of 50 mph – which is more than enough within most city limits.

talesofscienceandlove

melodiebenford:

3dciencia Visual Life Sciences - Animado invisiblis scientia.  3dciencia is a company founded by Ramon Andrade that specializes in scientific multimedia, animations, and illustrations.

1. Adenovirus ichosaedral nucleocapsid structure

Adenovirus infections most commonly cause illness of the respiratory system; however, depending on the infecting serotype, they may also cause various other illnesses and presentations. Symptoms of respiratory illness caused by adenovirus infection range from the common cold syndrome to pneumonia, croup, and bronchitis. Antigen detection, polymerase chain reaction assay, virus isolation, and serologycan be used to identify adenovirus infections. Most infections are mild and require no therapy or only symptomatic treatment. Because there is no virus-specific therapy, serious adenovirus illness can be managed only by treating symptoms and complications of the infection. 

2. Art - Flower made of red and white blood cells.

3. Crystal structure of human insulin degrading enzyme (IDE) in complex with Beta amyloid 1-42 (blue).

IDE cleaves multiple short polypeptides that vary considerably in sequence. Considerable interest in IDE has been stimulated due to the discovery that IDE can degrade beta amyloid, a peptide implicated in the pathogenesis of Alzheimer’s disease. More info 

4. Repression of Interferon response elements by NF-κβ p50. 

Computer model showing a molecule of the p50 homodimer of Nuclear factor kappa beta (NF-κβ, green) bound to the DNA interferon regulatory factor (IRF) recognition sequence on a strand of DNA (orange). IRF-3 (white and blue) is bound to an alternative DNA recognition site. NF-κβ is a protein complex that controls the transcription of DNA. IRFs are proteins that regulate the transcription of interferons. Incorrect regulation of NF-κB has been linked to cancer, inflammatory and autoimmune diseasesseptic shock, viral infection, and improper immune development.  

3dcienciatumblryoutubetwitterpinterest

climateadaptation

climateadaptation:

Happy 31 years of continuous eruption, Puʻu ʻŌʻō volcano!

January 3, 2014 marks the 31st anniversary of Kīlauea’s ongoing Puʻu ʻŌʻō eruption. This eruption ranks as the most voluminous outpouring of lava from the volcano’s East Rift Zone in the past five centuries. 

The eruption in Kilauea’s middle east rift zone started with a fissure eruption on January 3, 1983, and continued with few interruptions at Puʻu ʻŌʻō Cone, or temporarily from vents within a few kilometers to the east or west.

Via Pacific Island Parks

montereybayaquarium

montereybayaquarium:

How do you FIN-gerprint a Great White Shark?

To the untrained eye, one shark fin cutting through the water probably looks like any other. Yet each great white shark dorsal fin gives our researchers and their colleagues important clues that will help to identify and protect them.   

Like the swirls on a human fingerprint, the shape and notches of each white shark’s dorsal fin are unique, enabling scientists to catalog and track sharks across the oceans.  

Building a Fin Photo Database

Since 1987, great white shark researchers at the aquarium, Stanford University, Point Blue, Montana State University and the University of California, Davis, have been photographing dorsal fins –  first in waters off the Farallon Islands, and later at Año Nuevo Island and Tomales Point. They’ve created a photo database identifying 270 individuals over the past quarter century, providing the basis for the first-ever population estimate of adult and adolescent white sharks off the Central California coast.

This database helps scientists better understand where white sharks go and whether they return to the same waters on a regular basis. Fin IDs also help them estimate the number white sharks at these locations, and monitor the survival of individual animals.

Scientists have found that just as humans routinely travel between important locations — home, school, work — so too do great white sharks. White sharks congregate seasonally at spots along a migration route that takes them from the Central California coast, to the middle of the Pacific, and past southern California and Mexico.

Familiar Fins

Scientists use seal-shaped decoys to entice white sharks to the surface where it’s easy to photograph their fins. They also gather information such as size and sex when the sharks swim alongside their research boats. By comparing fin photos of the same sharks over the years, researchers concluded that – just as with our fingerprints, which remain the same over a lifetime – the overall shape of a shark fin remains fairly constant (with the exception of scrapes and scars).

In 2013, of the 80 individual adult white sharks photographed by researchers from the Aquarium and other institutions, nearly 65 percent had been seen in previous years. This suggests that the team is getting close to recognizing most of the adult great white sharks that frequent Central California waters.

Several have been coming back to the same waters for more than 20 years. One, a 16-foot male known as “Tom Johnson,” has been sighted for the last 26 years -  the longest tracking period for any white shark on earth. 

Learn more about white shark conservation