Valutazione discussione:
  • 0 voto(i) - 0 media
  • 1
  • 2
  • 3
  • 4
  • 5
/www.cheapnhljerseyslightning.com
#1
SAN FRANCISCO Brock Boeser Jersey , Dec. 25 (Xinhua) -- Wearing protective goggles and chin strap and flying through a field of lasers and microparticles, a parrotlet named Obi has helped researchers explain the way animals generate enough lift to fly and reveal that models currently used for the research are faulted.

The experiment was designed to compare commonly used models in the literature to figure out how much lift a bird, or other flying animal, generates based off its wake, explained Diana Chin, a graduate student in the lab of Stanford University mechanical engineer David Lentink. "What we found was that all three models we tried out were very inaccurate because they make assumptions that aren't necessarily true."

Researchers rely on these models to understand how animals support their weight during flight. The results are commonly referenced for work on flying robots and drones inspired by the biology of these animals.

The question was whether models of lift based on an inaccurate idea of an animal's wake were valid.

For the experiment, Eric Gutierrez Cheap Canucks Hats , former graduate student in the Lentink lab and lead author of a study published in the December issue of Bioinspiration and Biomimetics, made parrotlet-sized goggles using lenses from human laser safety goggles, 3D-printed sockets and veterinary tape. The goggles had reflective markers on the side so the researchers could track the bird's velocity. Then he trained Obi to wear the goggles and to fly from perch to perch.

Once trained, the bird flew through a laser sheet that illuminated nontoxic, micron-sized aerosol particles, its wing motion disturbing the particles to generate a detailed record of the vortices created by the flight. The particles swirling off Obi's wingtips created the clearest picture to date of the wake left by a flying animal.

Past measurements had been taken a few wingbeats behind the animal, and predicted that the animal-generated vortices remain relatively frozen over time Cheap Canucks T-Shirts , like airplane contrails before they dissipate. But the measurements in the new experiment revealed that the bird's tip vortices break up in a sudden dramatic fashion. "Now, whereas vortex breakup happens far away behind the aircraft, like more than a thousand meters, in birds, it can happen very close to the bird, within two or three wingbeats, and it is much more violent Cheap Canucks Hoodies ," said Lentink, who is the senior author on the paper.

The team applied each of the three prevailing models to the actual measurements they recorded and from that generated three different estimates of the amount of lift Obi generated with each wingbeat. They then compared those calculated estimates of lift to the actual lift measured in a previous study carried out using a sensitive device developed by the Lentink lab.

What they found is that to varying degrees, all three models failed to predict the actual lift generated by a flapping parrotlet.

The research highlights challenges in developing flying robots based on what's known about animal flight. "Many people look at the results in the animal flight literature for understanding how robotic wings could be designed better," Lentink was quoted as saying in a news release. "Now, we've shown that the equations that people have used are not as reliable as the community hoped they were. We need new studies, new methods to really inform this design process much more reliably."

It takes “SMART” to become Smart

For numerous, losing weight just isn’t the only fitness objective. They want it quickly enough also want it to stay on permanently. Following are some of the recommended fitness and nutrition rules that could assist you to attain your weight loss goals steadily but speedily:

1- Be Intelligent
Did you know that the term Smart is an abbreviation for becoming “Specific Custom Canucks Jerseys , Measured, Proper, Realistic, and Time-bound” about what you plan to accomplish?

Let’s assume, if your objective would be to increase your physical activity, then write down the sort of activity you plan to do, how a lot of times you are able to realistically do it each and every week Cheap Canucks Jerseys , and for how long every time. Start with modest, short, and simpler goals, and work your way up.

2- Be active
You’ll want to get at least 30 minutes of moderate physical activity per day, most days of the week to assist burn up extra calories. But give yourself credit for the activities that you are already performing. Do keep in mind, typical activities for example climbing stairs, pushing a stroller Sam Gagner Canucks Jersey , gardening, and walking all count as physical activity. Just make certain you do sufficient of them.

3- Make an offer
Make your self an offer that is too attractive to be refused. For example, just before starting to reach your next goal, supply yourself a promise like this, “If I reach my objective this (day, week, and month) Markus Granlund Canucks Jersey , I will treat myself to a well-deserved (Fill in a reward here, but not a food reward.).” Feel of some thing you want, like an afternoon off, a massage, a movie, or even a deposit toward a larger reward. Be creative, set up rewards for your self regularly Sven Baertschi Canucks Jersey , and make sure you give them to yourself when you reach your objective.

4- Keep your self full
Ask your self, “am I full but?” The question may take longer to answer than you think. It takes 15 minutes or more for the message that we’re full to obtain from our stomachs to our brains.
So take several minutes prior to digging in for that next helping. Having trouble feeling full?
Eight glasses (8 ounces every) or a lot more of water or other non-caloric beverages daily fills you up and keeps you refreshed. Also, vegetables and fruits can help you feel fuller, particularly when eaten raw.

5- Keep the record
Maintain a diary of what you eat and how much physical activity you get each day. Then. Von Miller Jersey Tom Brady Jersey Authentic Todd Gurley II Jersey Authentic T. J. Watt Jersey Authentic Stefon Diggs Jersey Shaquem Griffin Womens Jersey Saquon Barkley Youth Jersey Royce Freeman Youth Jersey Roquan Smith Kids Jersey Richard Sherman 49ers Jersey
Cita messaggio


Vai al forum:


Utenti che stanno guardando questa discussione: 1 Ospite(i)