Physics - Fruit flies swim through air - 1 views
-
A new experiment reported in Physical Review Letters shows that—contrary to popular wisdom—paddling can be as effective in air as it is in water. This could imply that insects evolved their flight capability from some earlier swimming trait.
-
Using high-speed video cameras to track wing motion, the team observed certain cases where the flies paddled their wings forward and backward. To confirm that this was indeed drag-based motion, the team plugged their wing data into an “insect flight simulator” and found that they could reproduce the fly’s overall movement. The authors constructed a simple model of paddling, which seems to support the theory that insect wings evolved in water.
Bioengineering to generate healthy skin - 1 views
-
That is, using a small biopsy from a specific patient, they can generate almost the entire cutaneous surface of that individual in the lab.
-
that it is possible to isolate epidermic stem cells from patients with different genetic skin diseases, cultivate them and, using molecular engineering as a first step, incorporate the therapeutic genes into each patient's genome to take the place of the one that the patient does not have or that functions abnormally. Afterwards, in the second step, the stem cells would be assembled into patches ready to be transplanted onto the patients.
-
"What we did in this case -- explains Marcela del Río -- was to transfer a normal SPINK-5 gene to a patient's stem cells and later use these cells to generate skin that could be transplanted to experimental models, such as mice."
PLoS ONE: Why Do Woodpeckers Resist Head Impact Injury: A Biomechanical Investigation - 1 views
-
FEM modelling of bone structures in woodpeckers combined with high speed video of pecking motion etc headgear? shock absorbing structures? low mass hammering penetrators? Lizhen Wang1,2, Jason Tak-Man Cheung3, Fang Pu1, Deyu Li1, Ming Zhang2*, Yubo Fan1* 1 Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, People's Republic of China, 2 Department of Health Technology and Informatics, the Hong Kong Polytechnic University, Hong Kong, 3 Li Ning Sports Science Research Center, Beijing, People's Republic of China Head injury is a leading cause of morbidity and death in both industrialized and developing countries.
Northern and southern hemisphere climates follow the beat of different drummers - 0 views
-
Over the last 1000 years, temperature differences between the Northern and Southern Hemispheres were larger than previously thought. Using new data from the Southern Hemisphere, researchers have shown that climate model simulations overestimate the links between the climate variations across the Earth with implications for regional predictions.
Properties of galaxies reproduced by hydrodynamic simulation (VIDEO) - 3 views
-
Scientists at MIT have traced 13 billion years of galaxy evolution, from shortly after the Big Bang to the present day. Their simulation, named Illustris, captures both the massive scale of the Universe and the intriguing variety of galaxies - something previous modelers have struggled to do. It produces a Universe that looks remarkably similar to what we see through our telescopes, giving us greater confidence in our understanding of the Universe, from the laws of physics to our theories about galaxy formation. "Simulation is the future of innovation"
Scientific method: Defend the integrity of physics - 2 views
-
Interesting article about theoretical physics theories vs. experimental verification. Can we state that a theory can be so good that its existence supplants the need for data and testing ? If a theory is proved to be untestable experimentally, can we still say that it is a scientific theory ? (not in my opinion)
-
There is an interesting approach by Feynman that it does not make sense to describe something of which we cannot measure the consequences. So a theory that is so removed from experiment that it cannot be backed by it is pointless and of no consequence. It is a bit as with the statement "if a tree falls in the forrest and nobody is there to hear it, does it make a sound?". We would typically extrapolate to say that it does make a sound. But actually nobody knows - you would have to take some kind of measurement. But even more fundamentally it does not make any difference! For all intents and purposes there is no point in forcing a prediction that you cannot measure and that therefore has noto reflect an event in your world.
-
"Mathematics is the model of the universe, not the other way round" - M. R.
Test shows big data text analysis inconsistent, inaccurate - 1 views
-
Big data analytic systems are reputed to be capable of finding a needle in a universe of haystacks without having to know what a needle looks like. The very best ways to sort large databases of unstructured text is to use a technique called Latent Dirichlet allocation (LDA). Unfortunately, LDA is also inaccurate enough at some tasks that the results of any topic model created with it are essentially meaningless, according to Luis Amaral, a physicist whose specialty is the mathematical analysis of complex systems and networks in the real world and one of the senior researchers on the multidisciplinary team from Northwestern University that wrote the paper. Even for an easy case, big data analysis is proving to be far more complicated than many of the companies selling analysis software want people to believe.
-
Most of those companies are using outdated algorithms like this LDA and just apply them like retards on those huge datasets. Of course they're going to come out with bad solutions. No amount of data can make up for bad algorithms.
Gigantic Ocean Vortices Seen From Space Could Change Climate Models | Science | WIRED - 5 views
The Reality of Quantum Mechanics @WIRED - 3 views
-
"Quantum mechanics is very successful; nobody's claiming that it's wrong," said Paul Milewski, a professor of mathematics at the University of Bath in England who has devised computer models of bouncing-droplet dynamics. "What we believe is that there may be, in fact, some more fundamental reason why [quantum mechanics] looks the way it does."
NASA Vesta Trek - 2 views
-
NASA Releases Tool Enabling Citizen Scientists to Examine Asteroid Vesta Vesta Trek is a free, web-based application that provides detailed visualizations of Vesta, one of the largest asteroids in our solar system. NASA's Dawn spacecraft studied Vesta from July 2011 to September 2012. Data gathered from multiple instruments aboard Dawn have been compiled into Vesta Trek's user-friendly set of tools, enabling citizen scientists and students to study the asteroid's features. The application includes: -- Interactive maps with the ability to overlay a growing range of data sets including topography, mineralogy, abundance of elements and geology, as well as analysis tools for measuring the diameters, heights and depths of surface features and more. -- 3-D printer-exportable topography so users can print physical models of Vesta's surface. -- Standard keyboard gaming controls to manoever a first-person visualization of "flying" across the surface of the asteroid. "There's nothing like seeing something with your own eyes, but these types of detailed data-visualizations are the next best thing," said Kristen Erickson, Director, Science Engagement and Partnerships at NASA Headquarters in Washington DC.
Acoustic topological insulator could hide submarines - 2 views
-
Researchers have proposed a new "acoustic topological insulator" that could help alleviate sound scattering problems by transmitting sound in certain directions without any backscattering.
-
If I understood correctly the triangular structure would channel the incident sound wave to a unique direction between two options, according to the rotation direction of the cylinders included in its mesh. So, one (possibly two) directions left to detect the hypothetical submarines? Very interesting though, I hope no oceanographers take measurements simultaneously to the signals as climate models will get even more wrong...!
Space data representation - 1 views
-
A common data hub that allows the representation and comparison of data from numerous space missions. "The IMPEx portal offers tools for the visualization and analysis of datasets from different space missions. Furthermore, several computational model databases are feeding into the environment." As they say, with its massive 3D-visualization capabilities it offers the possibility of displaying spacecraft trajectories, planetary ephemerides as well as scientific representations of observational and simulation datasets.
'Sewing' with molten glass and maths - BBC News - 1 views
-
From the section Science & Environment US researchers have developed what they call a "molten glass sewing machine" by combining 3D printing of glass with a mathematical model of how a liquid thread forms different types of loop. When the nozzle releasing a stream of molten glass is raised above a certain level, that thread begins to wobble.
Nuclear cycler: An incremental approach to the deflection of asteroids - 1 views
-
This paper introduces a novel deflection approach based on nuclear explosions: the nuclear cycler. The idea is to combine the effectiveness of nuclear explosions with the controllability and redundancy offered by slow push methods within an incremental deflection strategy. The paper will present an extended model for single nuclear stand-off explosions in the proximity of elongated ellipsoidal asteroids, and a family of natural formation orbits that allows the spacecraft to deploy multiple bombs while being shielded by the asteroid during the detonation.
« First
‹ Previous
161 - 180 of 192
Next ›
Showing 20▼ items per page