16 Matching Annotations
  1. Nov 2023
  2. Oct 2023
    1. 𝑟=−𝑥2 + 𝑦2‾‾‾‾‾‾‾‾√r=−x2 + y2r = -\sqrt{x^2 ~+~ y^2} (i.e. 𝑟rr is negative)

      Given that r is a polar coordinate, r cannot be negative, otherwise it would mean that the polar coordinate system would not be orthogonal, which it is.

    2. convention that 𝑟rr can be negative, by defining (−𝑟,𝜃)=(𝑟,𝜃+180∘)(−r,θ)=(r,θ+180∘)(-r,\theta) = (r,\theta + 180^\circ) for any angle 𝜃θ

      One cannot adopt a convention that contradicts the definition of "coordinates" and the fact that for orthogonal coordinate systems each coordinate do not depend on any other coordinate, otherwise, it would mean that the coordinate system is not orthogonal.

      For this reason, negative r is not a coordinate of a polar coordinate systems, since it needs pi in the angle coordinate, expressed as -r = (r, pi) and that the polar coordinate system is an orthogonal coordinate system.

      Calling -r a coordinate is a travesty.

    1. Eine Studie quanitifiziert zum ersten Mal den Einfluss der globalen Erhitzung auf die Überlebenschancen von Eisbären. Damit können erstmals die Auswirkungen von Emissionen auf das Überleben einer einzelnen Art bestimmt werden, so dass es auch möglich ist, aufgrund von Bestimmungen zum Artenschutz wie den Endangered Species Act Emissionsminderungen zu fordern. https://www.repubblica.it/green-and-blue/2023/09/14/news/orsi_polari_emissioni_gas_serra_rischio_estinzione-414364878/

      Studie: Unlock the Endangered Species Act to address GHG emissions

  3. Sep 2023
  4. Apr 2023
    1. Google and Microsoft are in an arms race to create something that could not only destroy the information commons, but potentially all of humanity. Both they and the fish farmers are caught in what’s called a multi-polar trap. A race-to-the bottom situation in which, even though individual actors might have the best of intentions, the incentive structures mean that everyone ends up worse off, and the commons is damaged or destroyed in the process.

      Multi-polar trap

    2. We might call on a halt to research, or ask for coordination around ethics, but it’s a tall order. It just takes one actor not to play (to not turn off their metaphorical fish filter), and everyone else is forced into the multi-polar trap.

      AI is a multi-polar trap

  5. May 2021
    1. Polar is an integrated reading environment to build your knowledge base. Actively read, annotate, connect thoughts, create flashcards, and track progress.

  6. Apr 2017
    1. Yet my father, driven to preserve our way of life, found his answer for resistance in a meeting that would be taking place in the Polar Ural Mountains”

      The Polar Ural Mountains and subsequent Mandalada resistance is an accurate and true event in the history of the Nenet community. In 1943, Soviet authorities from the Arkhandel’skaia Oblast were on their way to collect herders for reprimanding herders who sought to oppose the policies of the Union. A skirmish broke out upon their arrival, albeit brief, and the eventual surrendering of the Nenets resulted in the arrest and deportation to political prisoner camps of 36 individuals. Only two would return to camp.

      This historical event of cultural resistance would burn in the memories of Nenets for years to come, and recently became available to anthropologists and researchers through an oral history recounting by several primary sources to the event.

      For a full reading of the events recounted, read the source below.

      Laptander, Roza. “Processes of Remembering and Forgetting: Tundra Nenets’ Reminiscences of the 1943 Mandalada Rebellions.” Sibirica: Interdisciplinary Journal of Siberian Studies 13, no. 3 (Winter2014 2014): 22-44. Historical Abstracts with Full Text, EBSCOhost (accessed March 26, 2017).

  7. Mar 2017
    1. Arctic Circle

      The Region that lies beyond the 66.5 degree latitudinal line is widely accepted as the Arctic Circle. However, there are other indicators of an arctic region such as 10 degree celsius as the maximum air temperature, tundra to taiga biomes, or continuous permafrost. Despite these different labeling standards the Arctic Circle encompasses roughly 15% of the earths land area and 5% of the world ocean. Some areas in this region can go upwards of 130 days with out experiencing a sunrise. This period of time is known as a Polar Night, but is only experienced at latitudes north of 72degrees. Rather than Polar Night, much of the Arctic Circle experiences an extremely long twilight due to the gentle angle at which the sun rises and sets. As technology and globalization has improved, exploration in the Arctic Circle has increased substantially. The Arctic is an incredible asset to scientific researchers as we begin to increase our understanding of the region. Its variation in natural landscapes and ecosystems provide researchers with an extremely biodiverse system to study. This region is also home to an abundance of rich raw materials including gold and natural gas. As industrial interest in this region increase, there will also be an increased need for actors with stake in the region to communicate properly. With almost 30 different territories having claims in the Arctic and an estimated 200 million indigenous peoples living in the region, there are constant socioeconomic and political issues that need to be resolved.

      1)Burn, C.r. "Where Does The Polar Night Begin?" The Canadian Geographer/Le Géographe canadien 39, no. 1 (1995): 68-74. doi:10.1111/j.1541-0064.1995.tb00401.x. 2)Marsh, William M., and Martin M. Kaufman. Physical geography: great systems and global environments. Cambridge: Cambridge University Press, 2013. 3)Young, Oran R. Arctic Politics Conflict and Cooperation in the Circumpolar North. Hanover: Dartmouth College Press, 2000. 4)"Maritime jurisdiction and boundaries in the Arctic region ..." Accessed March 9, 2017. http://www.bing.com/cr?IG=3A1010B3AB3B42069672D55F84DE5213&CID=1CC31139A229699C242B1B79A318680A&rd=1&h=7tqBibkrhXoO_0f49soB5YPVU1UMalDfYlMRDxGhdv8&v=1&r=http%3a%2f%2fnews.bbc.co.uk%2f2%2fshared%2fbsp%2fhi%2fpdfs%2f06_08_08_arcticboundaries.pdf&p=DevEx,5071.1.

  8. Nov 2016
    1. Box 5.1, Figure 1 illustrates the polar amplification phenomenon for three different periods of the Earth’s climate history using tem-perature reconstructions from natural archives and climate model simulations for: (i) the Early Eocene Climatic Optimum (EECO, 54 to 48 Ma) characterised by CO2 concentrations of 1000 to 2000 ppm (Section and the absence of continental ice sheets; (ii) the mid-Pliocene Warm Period (MPWP, 3.3 to 3.0 Ma), characterized by CO2 concentrations in the range of 350 to 450 ppm (Section and reduced Greenland and Antarctic ice sheets compared to today (see Section 5.6.1), (iii) the Last Glacial Maximum (LGM, 21 to 19 ka), characterized by CO2 concentrations around 200 ppm and large continental ice sheets covering northern Europe and North America.
  9. Apr 2016
    1. Accession codes

      The panda and polar bear datasets should have been included in the data section rather than hidden in the URLs section. Production removed the DOIs and used (now dead) URLs instead, but for the working links and insight see the following blog: http://blogs.biomedcentral.com/gigablog/2012/12/21/promoting-datacitation-in-nature/