We found that the number of new chemical compounds has grown exponentially with a 4.4% annual production rate from 1800 to 2015 not even affected by World Wars. There are three distinct growth regimes: proto-organic, organic, and organometallic, with decreasing variability in the production of compounds over time. Contrary to the belief that organic synthesis developed only after 1828, synthesis had been a key provider of new compounds already at the beginning of the 19th century. By 1900, it became the established tool to report new compounds. We found that chemists are conservative when selecting starting materials and that despite the growing production of new compounds, most of them belong to a restricted set of chemical compositions.
Exploration of the chemical space and its three historical regimes
Eugenio J. Llanos, Wilmer Leal, Duc H. Luu, Jürgen Jost, Peter F. Stadler, and Guillermo Restrepo
Attaching sensors to crowd-sourced vehicles could provide a cheap and accurate way to monitor air pollution, road quality, and other aspects of a city’s health. But in order for so-called drive-by sensing to be practically useful, the sensor-equipped vehicle fleet needs to have large “sensing power”—that is, it needs to cover a large fraction of a city’s area during a given reference period. Here, we provide an analytic description of the sensing power of taxi fleets, which agrees with empirical data from nine major cities. Our results show taxis’ sensing power is unexpectedly large—in Manhattan; just 10 random taxis cover one-third of street segments daily, which certifies that drive-by sensing can be readily implemented in the real world.
Quantifying the sensing power of vehicle fleets
Kevin P. O’Keeffe, Amin Anjomshoaa, Steven H. Strogatz, Paolo Santi, and Carlo Ratti
At the most fundamental level many of the problems we face are the unfortunate outcome of the malpractice of thinking. Whichever complex problem one may consider –be it ecological, societal, political, economic, organisational etc.– one will likely find that it is caused by the clashing of incompatible or inadequate manners of thinking. Even when these are genuinely well intended and strongly self-justified, they often inadvertently contribute to composite problematics.
The inadequacies of our thinking are deeply entrenched in the way that we humans, perceive the world, ourselves in the world, and how we interact with it. Our professional, educational, cultural and metaphysical systems strongly dispose us towards outlining sharp boundaries, separating objects from backgrounds, ’us’ from ‘them’, defining identities and curving out what is to be of significance from what can be dismissed, disposed of, or exploited. Such dispositions result in oversimplifications which are often apparent to us in the thinking of others, but much less in our own thinking. Yet, they are omnipresent and almost impossible to avoid. Once cohered by logical reasoning, anchored in captivating symbolism and encoded in algorithms, such simplifications turn into cages: mental, emotional, operational… Moving beyond them becomes literally unthinkable. We may repeat the mantra of ‘thinking outside the box’, we may praise critical, independent, creative and disruptive thinking, but these get deployed only in as far as they prove usable for the affirmation of our respective, deeply rooted worldviews.
The Center for Complexity Sciences (C3) at the Universidad Nacional Autónoma de México is seeking candidates for a one year researcher position (extensible for a second year).
The candidates should have more than ten publications in indexed journals and to have directed at least one thesis (doctorate, masters, or bachelors). Projects can be individual or related to current research at the C3.
Cybersecurity is one of the fastest growing and largest technology sectors and is increasingly being recognized as one of the major issues in many industries, so companies are increasing their security budgets in order to guarantee the security of their processes. Successful menaces to the security of information systems could lead to safety, environmental, production, and quality problems.
One of the most harmful issues of attacks and intrusions is the ever-changing nature of attack technologies and strategies, which increases the difficulty of protecting computer systems. As a result, advanced systems are required to deal with the ever-increasing complexity of attacks in order to protect systems and information.
This special issue received several contributions, 5 of which have been accepted for publication.
Volume 2019, Article ID 3261453, 2 pages
Advances in Complex Systems and Their Applications to Cybersecurity
Fernando Sánchez Lasheras, Danilo Comminiello, and Alicja Krzemień