exstrom.com的 10 大竞争对手

sooeet.com

free text messaging. send and receive free text messages from your pc for free

mathoverflow.net

Q&A for professional mathematicians

geomag.usgs.gov

Although extinctions occur naturally, the current rate of plant and animal extinctions is much higher than the natural or historical rates. Habitat loss is the primary cause of higher extinction rates. Other causes include habitat changes, over-exploitation of wildlife for commercial purposes, the introduction of harmful nonnative species, pollution, and the spread of diseases.Learn more: Endangered Species Act

gemsys.ca

🌍 GEM Systems is excited to join the Near Surface Geoscience Conference 2025 in Naples, Italy! 🇮🇹✨ 📅 7–11 SeptemberThis year’s program features five parallel conferences, including new tracks on #Geohazards and #UXO Detection. A perfect opportunity to explore innovation, share solutions, and connect with geoscience professionals worldwide. 👉 See you at #NSG2025! https://eagensg.org/

geometrics.com

Geometrics Discussion Board

radio-electronics.com

now incorporating the best of radio-electronics.com, electronics notes offers basic radio & electronics tutorials to learn electronics online as well as practical construction techniques and technology history

arxiv.org

A system of non-tradable credits that flow between individuals like karma, hence proposed under that name, is a mechanism for repeated resource allocation that comes with attractive efficiency and fairness properties, in theory. In this study, we test karma in an online experiment in which human subjects repeatedly compete for a resource with time-varying and stochastic individual preferences or urgency to acquire the resource. We confirm that karma has significant and sustained welfare benefits even in a population with no prior training. We identify mechanism usage in contexts with sporadic high urgency, more so than with frequent moderate urgency, and implemented as a simple (binary) karma bidding scheme as particularly effective for welfare improvements: relatively larger aggregate efficiency gains are realized that are (almost) Pareto superior. These findings provide guidance for further testing and for future implementation plans of such mechanisms in the real world.