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Planets, Planets Everywhere - Newsweek

Planets, Planets Everywhere - Newsweek | collectibles from scoop.it | Scoop.it
Newsweek
Planets, Planets Everywhere
Newsweek
Back in 1600, the former monk Giordano Bruno was burned alive in the streets of Rome for claiming that life can thrive on alien planets. Fortunately, we don't burn astronomers at the stake anymore.

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Crisis Responses and Crisis Management: what can we learn from Biological Networks?

The generality of network properties allows the utilization of the ‘wisdom’ of biological systems surviving crisis events for many millions of years. Yeast protein-protein interaction network shows a decrease in community-overlap (an increase in community cohesion) in stress. Community rearrangement seems to be a cost-efficient, general crisis-management response of complex systems. Inter-community bridges, such as the highly dynamic ‘creative nodes’ emerge as crucial determinants helping crisis survival.

 

Crisis Responses and Crisis Management: what can we learn from Biological Networks?
Péter Csermely, Agoston Mihalik, Zsolt Vassy, András London

Systema: connecting matter, life, culture and technology

Vol 2, No 1 (2014)

http://www.systema-journal.org/article/view/115 


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Liz Rykert's curator insight, April 13, 10:46 AM

Love the insights generated by looking at existing systems and how one could apply or learn from how they function in a different context - rich with insight and ideas.

Eli Levine's curator insight, April 13, 6:54 PM

Interesting.

 

Check it out.

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Noise induces explosive synchronization

We study explosive synchronization of network-coupled oscillators. Despite recent advances it remains unclear how robust explosive synchronization is in view of realistic structural and dynamical properties. Here we show that explosive synchronization can be induced simply by adding uncorrelated noise to the oscillators' frequencies, demonstrating it is not only robust to, but moreover promoted by, this natural mechanism. We support these results numerically and analytically, presenting simulations of a real neural network as well as a self consistency theory used to study synthetic networks.

 

Noise induces explosive synchronization
Per Sebastian Skardal, Alex Arenas

http://arxiv.org/abs/1404.0883


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Dynamical Systems on Networks: A Tutorial

We give a tutorial for the study of dynamical systems on networks, and we focus in particular on ``simple" situations that are tractable analytically. We briefly motivate why examining dynamical systems on networks is interesting and important. We then give several fascinating examples and discuss some theoretical results. We also discuss dynamical systems on dynamical (i.e., time-dependent) networks, overview software implementations, and give our outlook on the field.

 

Dynamical Systems on Networks: A Tutorial
Mason A. Porter, James P. Gleeson

http://arxiv.org/abs/1403.7663


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Synchronicity and quantum entanglement - YouTube

On the trail of the dialogue by W. Pauli and C.G. Jung An even more neglected correspondence (1932-58) of the Nobel Prize winner and pioneer of quantum theor... (Synchronicity and quantum entanglement, W.

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Philippe Vallat's curator insight, April 6, 3:35 AM

Always interesting to listen to open-minded and curious scientists

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Noise in biology

Noise permeates biology on all levels, from the most basic molecular, sub-cellular processes to the dynamics of tissues, organs, organisms and populations. The functional roles of noise in biological processes can vary greatly. Along with standard, entropy-increasing effects of producing random mutations, diversifying phenotypes in isogenic populations, limiting information capacity of signaling relays, it occasionally plays more surprising constructive roles by accelerating the pace of evolution, providing selective advantage in dynamic environments, enhancing intracellular transport of biomolecules and increasing information capacity of signaling pathways. This short review covers the recent progress in understanding mechanisms and effects of fluctuations in biological systems of different scales and the basic approaches to their mathematical modeling.

 

Lev S Tsimring 2014 Rep. Prog. Phys. 77 026601
http://dx.doi.org/10.1088/0034-4885/77/2/026601


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20,000+ FREE Online Science and Technology Lectures from Top Universities

20,000+ FREE Online Science and Technology Lectures from Top Universities | collectibles from scoop.it | Scoop.it

The following topics are covered:

 

Aerospace, Anthropology, Astrobiology, Astronomy, Astrophysics, Biochemistry, Bioengineering, Biology, Biotechnology, Chemistry, Civil Engineering, Cognitive Science, Computers, Cosmology, Dentistry, Electrical Engineering, Engineering, Environment, Future, General Science, Geoscience, Machine Learning, Material Science, Mathematics, Mechanical Engineering, Medicine, Metallurgy, Mining, Nanotechnology, Oceanography, Philosophy, Physics, Physiology, Robotics, and Sociology.

 

Lectures are in Playlists and are alphabetically sorted with thumbnail pictures. No fee, no registration required - learn at your own pace. Certificates can be arranged with presenting universities.

 

NOTE: To subscribe to the RSS feed of Amazing Science, copy http://www.scoop.it/t/amazing-science/rss.xml into the URL field of your browser and click "subscribe".

 

This newsletter is aggregated from over 1450 news sources:

http://www.genautica.com/links/1450_news_sources.html

 

All my Tweets and Scoop.It! posts sorted and searchable:

http://www.genautica.com/tweets/index.html

 

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NOTE: All articles in the amazing-science newsletter can also be sorted by topic. To do so, click the FIND buntton (symbolized by the FUNNEL on the top right of the screen)  and display all the relevant postings SORTED by TOPICS.

 

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e.g., you are looking for articles involving "dna" as a keyword

 

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MOST_READ 3D_printing aging AI anthropology art astronomy bigdata bioinformatics biology biotech chemistry computers cosmology education environment evolution future genetics genomics geosciences green_energy history language machine_learning map material_science math med medicine microscopy nanotech neuroscience paleontology photography photonics physics postings robotics science technology video 


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Michel Jammes's curator insight, December 30, 2013 4:02 AM

MOOC , not a buzz word , a reality...

Margarida Sá Costa's curator insight, January 31, 9:55 AM

Lectures are in Playlists and are alphabetically sorted with thumbnail pictures. No fee, no registration required - learn at your own pace. Certificates can be arranged with presenting universities.

Casper Pieters's curator insight, March 9, 7:21 PM

Great resources for online learning just about everything.  All you need is will power and self- discipline.

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In the Beggar's Outstretched Hand

In the Beggar's Outstretched Hand | collectibles from scoop.it | Scoop.it
We all react when we see the beggar in the corner of the streets, stretching out his, or her, hand, begging us for a small contribution.

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Soul Spelunker: Practical Applications Of Animaterialism

Soul Spelunker: Practical Applications Of Animaterialism | collectibles from scoop.it | Scoop.it

If we believe the universe is a living organic reality, and all things are interconnected, the way we treat all creatures will be affected. Our current milieu, being based on a dualistic materialistic capitalism, acts toward all things with one thing in mind: profit. Its most vocal proponents pay lip service to the Jesus of the Gospels. But the Jesus of the Gospels wanted nothing to do with those who greedily manipulated the people. He spoke out against it time and time again. We should too. If we are related to each other and to all things, as we are, animaterialism necessarily infers we treat all things with lovingkindness, respect, empathy, and magnanimity. This is the primary practical effect of accepting the animaterialist worldview.


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The Strange New Science of Chaos - YouTube

oo rare A 1989 program, with Lorenz


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Vasileios Basios's insight:

Wow! such a rare delightful material .... Ralph Abraham and Lorenz who could imagine!

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Eli Levine's curator insight, March 31, 3:08 PM

I <3 Science.

It just keeps learning more and more about the universe, ourselves and ourselves within the universe.

It doesn't stop, until we stop.

 

The lessons that are discussed here are applicable to our social sciences and questions of governance, especially the non-linear nature of society, economy and social psychology and the importance of initial conditions.

 

It's not a stable universe.

 

And we're living and apart of the instability!

 

Think about it.

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Stanford Study: 100% Renewable Energy Is Feasible and Affordable

Stanford Study: 100% Renewable Energy Is Feasible and Affordable | collectibles from scoop.it | Scoop.it

One of the greatest promises of the high-tech future, whether made explicitly or implicitly through shiny clean concept sketches, is that we will have efficient energy that doesn’t churn pollutants into the air and onto the streets.

 

But here in the present, politicians and even many clean energy advocates maintain that a world run on hydrogen and wind, water and solar power is not yet possible due to technical challenges like energy storage and cost.

 

Yet Stanford University researchers led by civil engineer Mark Jacobson have developed detailed plans for each state in the union that to move to 100 percent wind, water and solar power by 2050 using only technology that’s already available. The plan, presented recently at the AAAS conference in Chicago, also forms the basis for The Solutions Project nonprofit.

 

“The conclusion is that it’s technically and economically feasible,” states Jacobson. The plan doesn’t rely, like many others, on dramatic energy efficiency regimes. Nor does it include biofuels or nuclear power, whose green credentials are the source of much debate.


The proposal is straightforward: eliminate combustion as a source of energy, because it’s dirty and inefficient. All vehicles would be powered by electric batteries or by hydrogen, where the hydrogen is produced through electrolysis rather than natural gas. High-temperature industrial processes would also use electricity or hydrogen combustion.

 

The rest would simply be a question of allowing existing fossil-fuel plants to age out and using renewable sources to power any new plants that come online. The energy sources in the road map include geothermal energy, concentrating solar power, off-shore and on-land wind turbines and some and tidal energy. All but tidal energy collectors are already commercially available.


Clean energy would save an average American consumer $3,400 per year than the current fossil fuel regime by 2050, the study lays out. That’s because the price of fossil fuel rises regularly, but with clean energy — where raw materials are free — once the infrastructure is built, prices would fall.


Jacobson has previously mapped out a similar proposal for the global energy market, including China. A related plan with a greater emphasis on efficiency was recently released by the World Wildlife Fund.


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Eli Levine's curator insight, March 30, 1:12 PM

Way cool.

 

But it will not be put into place due to the politics of the fossil fuel industry and their undemocratic influence in our governments across the world.

 

They stand to lose a lot of money; forced to give up massive amounts of invested capital (even though the profits they've realized from those capital assets have, so far, more than paid for themselves already).

 

Here we are, contemplating putting a high polluting oil pipeline through our country while we frack for natural gas, and we could be spending our time getting off fossil fuels entirely in an economically viable manner.

 

Think about it.

Ökologische Heizsysteme Hofmannn & Gold's curator insight, April 2, 7:21 AM

Wir sagen es schon lange: Energie ist im Überfluss vorhanden. Wir müssen nur die Nutzung optimieren!

 

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Electric “thinking cap” controls learning speed

Electric “thinking cap” controls learning speed | collectibles from scoop.it | Scoop.it

Caffeine-fueled cram sessions are routine occurrences on any college campus. But what if there was a better, safer way to learn new or difficult material more quickly? What if “thinking caps” were real?

 

In a new study published in the Journal of Neuroscience, Vanderbilt psychologists Robert Reinhart, a Ph.D. candidate, and Geoffrey Woodman, assistant professor of psychology, show that it is possible to selectively manipulate our ability to learn through the application of a mild electrical current to the brain, and that this effect can be enhanced or depressed depending on the direction of the current.

 

Reinhart and Woodman set out to test several hypotheses: One, they wanted to establish that it is possible to control the brain’s electrophysiological response to mistakes, and two, that its effect could be intentionally regulated up or down depending on the direction of an electrical current applied to it. This bi-directionality had been observed before in animal studies, but not in humans. Additionally, the researchers set out to see how long the effect lasted and whether the results could be generalized to other tasks.


Using an elastic headband that secured two electrodes conducted by saline-soaked sponges to the cheek and the crown of the head, the researchers applied 20 minutes of transcranial direct current stimulation (tDCS) to each subject. In tDCS, a very mild direct current travels from the anodal electrode, through the skin, muscle, bones and brain, and out through the corresponding cathodal electrode to complete the circuit. “It’s one of the safest ways to noninvasively stimulate the brain,” Reinhart said. The current is so gentle that subjects reported only a few seconds of tingling or itching at the beginning of each stimulation session.

 

In each of three sessions, subjects were randomly given either an anodal (current traveling from the electrode on the crown of the head to the one on the cheek), cathodal (current traveling from cheek to crown) or a sham condition that replicated the physical tingling sensation under the electrodes without affecting the brain. The subjects were unable to tell the difference between the three conditions.

 

After 20 minutes of stimulation, subjects were given a learning task that involved figuring out by trial and error which buttons on a game controller corresponded to specific colors displayed on a monitor. The task was made more complicated by occasionally displaying a signal for the subject not to respond—sort of like a reverse “Simon Says.” For even more difficulty, they had less than a second to respond correctly, providing many opportunities to make errors—and, therefore, many opportunities for the medial-frontal cortex to fire.


When anodal current was applied, the spike was almost twice as large on average and was significantly higher in a majority of the individuals tested (about 75 percent of all subjects across four experiments). This was reflected in their behavior; they made fewer errors and learned from their mistakes more quickly than they did after the sham stimulus. When cathodal current was applied, the researchers observed the opposite result: The spike was significantly smaller, and the subjects made more errors and took longer to learn the task. “So when we up-regulate that process, we can make you more cautious, less error-prone, more adaptable to new or changing situations—which is pretty extraordinary,” Reinhart said.


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Local active information storage as a tool to understand distributed neural information processing

Every act of information processing can in principle be decomposed into the component operations of information storage, transfer, and modification. Yet, while this is easily done for today’s digital computers, the application of these concepts to neural information processing was hampered by the lack of proper mathematical definitions of these operations on information. Recently, such definitions were given and the specific concept of local active information storage was successfully applied to the analysis and optimization of artificial neural systems. However, no attempt to measure local active information storage in neural data has been made to date. Here we measure local active information storage on a local scale in time and space in voltage sensitive dye imaging data from area 18 of the cat. We show that storage reflects neural properties such as stimulus preferences and surprise upon unexpected stimulus change, and in area 18 reflects the abstract concept of an ongoing stimulus despite the locally random nature of this stimulus. We suggest that LAIS will be a useful quantity to test theories of cortical function, such as predictive coding.

 

Michael Wibral, Joseph T. Lizier, Sebastian Vögler, Viola Priesemann and Ralf Galuske,

Local active information storage as a tool to understand distributed neural information processing

Frontiers in Neuroinformatics 8:1 (2014)

http://dx.doi.org/10.3389/fninf.2014.00001 ;


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Think Locally, Act Locally: The Detection of Small, Medium-Sized, and Large Communities in Large Networks

It is common in the study of networks to investigate meso-scale features to try to understand network structure and function. For example, numerous algorithms have been developed to try to identify ``communities,'' which are typically construed as sets of nodes with denser connections internally than with the remainder of a network. In this paper, we adopt a complementary perspective that ``communities'' are associated with bottlenecks of dynamical processes that begin at locally-biased seed sets of nodes, and we employ several different community-identification procedures to investigate community quality as a function of community size. Using several empirical and synthetic networks, we identify several distinct scenarios for ``size-resolved community structure'' that can arise in real (and realistic) networks: (i) the best small groups of nodes can be better than the best large groups (for a given formulation of the idea of a good community); (ii) the best small groups can have a quality that is comparable to the best medium-sized and large groups; and (iii) the best small groups of nodes can be worse than the best large groups. As we discuss in detail, which of these three cases holds for a given network can make an enormous difference when investigating and making claims about network community structure, and it is important to take this into account to obtain reliable downstream conclusions. 

 

Think Locally, Act Locally: The Detection of Small, Medium-Sized, and Large Communities in Large Networks
Lucas G. S. Jeub, Prakash Balachandran, Mason A. Porter, Peter J. Mucha, Michael W. Mahoney

http://arxiv.org/abs/1403.3795


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Anima on the wheel – Female Archetypes of Toni Wolff

Anima on the wheel – Female Archetypes of Toni Wolff | collectibles from scoop.it | Scoop.it
Lets say this is not an essay but a fictional story. I was very pleased that good friend of mine, who happens to be a catholic monk and psychoanalyst, accepted to be the god-father of my son.

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Innovations in Statistical Physics

In 1963-71, a group of people, myself included, formulated and perfected a new approach to physics problems, which eventually came to be known under the names of scaling, universality, and renormalization. This work formed the basis of a wide variety of theories ranging from its starting point in critical phenomena, and moving out to particle physics and relativity and then into economics and biology. This work was of transcendental beauty and of considerable intellectual importance.
This left me with a personal problem. What next? Constructing the answer to that question would dominate the next 45 years of my professional life. I would try to:
* Help in finding and constructing new fields of science
* Do research and give talks on science/society borderline
* Provide helpful, constructive criticism of scientific and technical work
* Help students and younger scientists
* Demonstrate scientific leadership

 

Innovations in Statistical Physics
Leo P. Kadanoff

http://arxiv.org/abs/1403.6464


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Contributions and challenges for network models in cognitive neuroscience

Contributions and challenges for network models in cognitive neuroscience | collectibles from scoop.it | Scoop.it

The confluence of new approaches in recording patterns of brain connectivity and quantitative analytic tools from network science has opened new avenues toward understanding the organization and function of brain networks. Descriptive network models of brain structural and functional connectivity have made several important contributions; for example, in the mapping of putative network hubs and network communities. Building on the importance of anatomical and functional interactions, network models have provided insight into the basic structures and mechanisms that enable integrative neural processes. Network models have also been instrumental in understanding the role of structural brain networks in generating spatially and temporally organized brain activity. Despite these contributions, network models are subject to limitations in methodology and interpretation, and they face many challenges as brain connectivity data sets continue to increase in detail and complexity.

 

Contributions and challenges for network models in cognitive neuroscience
• Olaf Sporns
Nature Neuroscience (2014) http://dx.doi.org/10.1038/nn.3690


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Synchronicity and quantum entanglement - YouTube

On the trail of the dialogue by W. Pauli and C.G. Jung An even more neglected correspondence (1932-58) of the Nobel Prize winner and pioneer of quantum theor... (Synchronicity and quantum entanglement, W.

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Philippe Vallat's curator insight, April 6, 3:35 AM

Always interesting to listen to open-minded and curious scientists

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Behavioral and Network Origins of Wealth Inequality: Insights from a Virtual World

Almost universally, wealth is not distributed uniformly within societies or economies. Even though wealth data have been collected in various forms for centuries, the origins for the observed wealth-disparity and social inequality are not yet fully understood. Especially the impact and connections of human behavior on wealth could so far not be inferred from data. Here we study wealth data from the virtual economy of the massive multiplayer online game (MMOG) Pardus. This data not only contains every player's wealth at every point in time, but also all actions of every player over a timespan of almost a decade. We find that wealth distributions in the virtual world are very similar to those in western countries. In particular we find an approximate exponential for low wealth and a power-law tail. The Gini index is found to be 0.65, which is close to the indices of many Western countries. We find that wealth-increase rates depend on the time when players entered the game. Players that entered the game early on tend to have remarkably higher wealth-increase rates than those who joined later. Studying the players' positions within their social networks, we find that the local position in the trade network is most relevant for wealth. Wealthy people have high in- and out-degree in the trade network, relatively low nearest-neighbor degree and a low clustering coefficient. Wealthy players have many mutual friendships and are socially well respected by others, but spend more time on business than on socializing. We find that players that are not organized within social groups with at least three members are significantly poorer on average. We observe that high `political' status and high wealth go hand in hand. Wealthy players have few personal enemies, but show animosity towards players that behave as public enemies.


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Eli Levine's curator insight, April 5, 10:53 AM

When you let laissez-faire take its course, only a few individuals really end up on top.  That's not to say that markets shouldn't be allowed and enabled to exist, for the sake of the free exchange of goods, services, knowledge, wealth, etc.  It is saying that we need non-intrusive mechanisms to help make sure that the wealth that is produced is enjoyed by everyone who produced it.

 

Some people will always have more than others, for behavioral reasons and for circumstantial reasons.  That is not a problem, in my own view.  The problem comes, for me, when their focus on wealth becomes so great that they lose sight of their human needs on the individual as well as social and environmental levels, such that they choose wealth that they will not use over that which they need for survival and physical/psychological well being.

 

It's a form of being disconnected with the real world, kind of like schizophrenia.  The brain isn't functioning properly when  greed is and has taken over, for one reason or another.  It should be considered a mental illness that we could, potentially in time, treat, such that these individuals who are not aware and do not care to be aware of their actual place in the universe can lead normal, happy, healthy and appropriately placed lives in our societies.

 

So, we're left with the present situation in which work is undervalued, relative to what it produces, while executive management is way overvalued relative to its healthy role in the economy and society.  I'm not saying that pure equality is desirable, because sometimes people do work harder than others and deserve a greater share of wealth than someone who didn't work when they honestly could have.  What I'm saying, is that indulging the elite's fantasy of the ego is detrimental to themselves and to others, and that I don't think it should be accepted or tolerated within our social world.

 

If you want equality of opportunities, you must have more equality of outcomes.  That is yet another fact about our world that conservatives fail to accept and appreciate, if they're attempting to realize a world in which we are all together as one, rather than a world where we are heavily stratified according to an artificial hierarchy.  That is the difference between a conservative and a progressive.  One wants us all to be living together in peace, harmony, stability and, for want of a better word, love, while the other just wants everyone in a specific place according to birth.  One promotes democracy and inclusivity, the other, discourages it.  One works better for humanity on the tangible level, the other, does not.

 

And it's just a difference in brain type/values that makes them be something so antithetical to what Western civilization has stood for.

 

Think about it.

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NASA set to release online software catalog

NASA set to release online software catalog | collectibles from scoop.it | Scoop.it

Get ready for a stimulating software catalog. You may want to write NASA CAT. next to Thursday, April 10, on your calendar. That is the day that the National Aeronautics and Space Administration (NASA) is to make available to the public, at no cost, more than 1,000 codes with its release of a new online software catalog. The catalog, a master list organized into 15 categories, is intended for industry, academia, other government agencies, and general public. The catalog covers technology topics ranging from project management systems, design tools, data handling, image processing, solutions for life support functions, aeronautics, structural analysis, and robotic and autonomous systems. NASA said the codes represent NASA's best solutions to an array of complex mission requirements.

"Software is an increasingly important element of the agency's intellectual asset portfolio," said Jim Adams, deputy chief technologist with NASA. "It makes up about one-third of its reported inventions each year." With this month's release of the software catalog, he said, the software becomes widely available to the public. Each NASA code was evaluated, however, for access restrictions and designated for a specific type of release, ranging from codes open to all U.S. citizens to codes restricted to use by other federal agencies.

 

The catalog nonetheless fits into NASA's ongoing efforts to transfer more NASA technologies to American industry and U.S. consumers As Wired's Robert McMillan wrote on Friday, "This NASA software catalog will list more than 1,000 projects, and it will show you how to actually obtain the code you want. The idea to help hackers and entrepreneurs push these ideas in new directions—and help them dream up new ideas."

 

Adams said, "By making NASA resources more accessible and usable by the public, we are encouraging innovation and entrepreneurship. Our technology transfer program is an important part of bringing the benefit of space exploration back to Earth for the benefit of all people."

Daniel Lockney, technology transfer program executive with NASA's Office of the Chief Technologist, underscored this down-to-earth mission side of NASA in 2012 in an article in Innovation in 2012. "NASA really is the gold standard for technology transfer," he then said. "The money spent on research and development doesn't just go up into space; it comes down to earth in the form of some very practical and tangible results." Lockney said they know the investment in technology creates jobs, boosts the economy and provides benefits in addition to the mission focus. "Our technologies have done everything from make hospitals more efficient to making transportation safer and greener. The technology reaches into all aspects about our lives."


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Russ Roberts's curator insight, April 6, 1:47 AM

This could prove interesting to anyone interested in science and technology.  "Wired" spokesman Robert McMillan says this NASA Software Catalog "will list more than 1,000 projects and it will show you how to actually obtain the codes you want."  NASA spokesman Jim Adams adds that the release of the catalog "is an important part of bringing the benefits of space exploration back to Earth for the benefit of all people."  Aloha de Russ (KH6JRM).

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Evolutionary game theory using agent-based methods

Evolutionary game theory is a successful mathematical framework geared towards understanding the selective pressures that affect the evolution of the strategies of agents engaged in interactions with potential conflicts. While a mathematical treatment of the costs and benefits of decisions can predict the optimal strategy in simple settings, more realistic situations (finite populations, non-vanishing mutations rates, communication between agents, and spatial interactions) require agent-based methods where each agent is modeled as an individual, carries its own genes that determine its decisions, and where the evolutionary outcome can only be ascertained by evolving the population of agents forward in time. Here we discuss the use of agent-based methods in evolutionary game theory and contrast standard results to those obtainable by a mathematical treatment. We conclude that agent-based methods can predict evolutionary outcomes where purely mathematical treatments cannot tread, but that mathematics is crucial to validate the computational simulations.

 

Evolutionary game theory using agent-based methods
Christoph Adami, Jory Schossau, Arend Hintze

http://arxiv.org/abs/1404.0994


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Dynamical Systems on Networks: A Tutorial

We give a tutorial for the study of dynamical systems on networks, and we focus in particular on ``simple" situations that are tractable analytically. We briefly motivate why examining dynamical systems on networks is interesting and important. We then give several fascinating examples and discuss some theoretical results. We also discuss dynamical systems on dynamical (i.e., time-dependent) networks, overview software implementations, and give our outlook on the field.


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20,000+ FREE Online Science and Technology Lectures from Top Universities

20,000+ FREE Online Science and Technology Lectures from Top Universities | collectibles from scoop.it | Scoop.it

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Michel Jammes's curator insight, December 30, 2013 4:02 AM

MOOC , not a buzz word , a reality...

Margarida Sá Costa's curator insight, January 31, 9:55 AM

Lectures are in Playlists and are alphabetically sorted with thumbnail pictures. No fee, no registration required - learn at your own pace. Certificates can be arranged with presenting universities.

Casper Pieters's curator insight, March 9, 7:21 PM

Great resources for online learning just about everything.  All you need is will power and self- discipline.

Rescooped by Vasileios Basios from Amazing Science
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NASA-funded study finds: Our civilization faces similar threats of collapse as the Mayans experienced

NASA-funded study finds: Our civilization faces similar threats of collapse as the Mayans experienced | collectibles from scoop.it | Scoop.it

Natural and social scientists develop new model of how 'perfect storm' of crises could unravel global system.


A new study sponsored by Nasa's Goddard Space Flight Center has highlighted the prospect that global industrial civilization could collapse in coming decades due to unsustainable resource exploitation and increasingly unequal wealth distribution.

 

Noting that warnings of 'collapse' are often seen to be fringe or controversial, the study attempts to make sense of compelling historical data showing that "the process of rise-and-collapse is actually a recurrent cycle found throughout history." Cases of severe civilizational disruption due to "precipitous collapse - often lasting centuries - have been quite common."

 

The research project is based on a new cross-disciplinary 'Human And Nature DYnamical' (HANDY) model, led by applied mathematician Safa Motesharrei of the US National Science Foundation-supported National Socio-Environmental Synthesis Center, in association with a team of natural and social scientists. The study based on the HANDY model has been accepted for publication in the peer-reviewed Elsevier journal, Ecological Economics.


It finds that according to the historical record even advanced, complex civilizations are susceptible to collapse, raising questions about the sustainability of modern civilization: "The fall of the Roman Empire, and the equally (if not more) advanced Han, Mauryan, and Gupta Empires, as well as so many advanced Mesopotamian Empires, are all testimony to the fact that advanced, sophisticated, complex, and creative civilizations can be both fragile and impermanent."


By investigating the human-nature dynamics of these past cases of collapse, the project identifies the most salient interrelated factors which explain civilizational decline, and which may help determine the risk of collapse today: namely, Population, Climate, Water, Agriculture, and Energy.

 

These factors can lead to collapse when they converge to generate two crucial social features: "the stretching of resources due to the strain placed on the ecological carrying capacity"; and "the economic stratification of society into Elites [rich] and Masses (or "Commoners") [poor]" These social phenomena have played "a central role in the character or in the process of the collapse," in all such cases over "the last five thousand years."



Via Dr. Stefan Gruenwald
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Rescooped by Vasileios Basios from Amazing Science
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Physics-minded crows bring Aesop's fable to life

Physics-minded crows bring Aesop's fable to life | collectibles from scoop.it | Scoop.it

Using stones to raise water in a pitcher isn't just the stuff of fiction: experiments show that crows have an understanding of water displacement.

 

To see if New Caledonian crows could handle some of the basic principles of volume displacement, Sarah Jelbert at the University of Auckland in New Zealand and her colleagues placed scraps of meat just out of a crow's reach, floating in a series of tubes that were part-filled with water. Objects potentially useful for bringing up the water level, like stones or heavy rubber erasers, were left nearby. The crows successfully figured out that heavy and solid objects would help them get a treat faster. They also preferred to drop objects in tubes where they could access a reward more easily, picking out tubes with higher water levels and choosing tubes of water over sand-filled ones.

 

However, the crows failed at more challenging tasks that required an understanding of the effect of tube width or the ability to infer a hidden connection between two linked tubes. The crows displayed reasoning skills equivalent to an average 5 to 7 year old human child, the researchers claim. Previously, Eurasian jays have shown some understanding of water displacement, as have chimpanzees and orang-utans, but using similar experiments could assess and compare their skill levels. "Any animal capable of picking up stones could potentially participate," write the researchers.


Via Dr. Stefan Gruenwald
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Rescooped by Vasileios Basios from Papers
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General Centrality in a hypergraph

The goal of this paper is to present a centrality measurement for the nodes of a hypergraph, by using existing literature which extends eigenvector centrality from a graph to a hypergraph, and literature which give a general centrality measurement for a graph. We will use this measurement to say more about the number of communications in a hypergraph, to implement a learning mechanism, and to construct certain networks.

 

General Centrality in a hypergraph
Evo Busseniers

http://arxiv.org/abs/1403.5162


Via Complexity Digest
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