Using modern portfolio theory, investors can build portfolios that maximize return for a given level of risk or minimize risk for a desired level of return. Since its introduction by Henry ...

Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China ...

These fuel cells can generally be used as direct replacements for more traditional systems like gas boilers in your home (in theory ... etc. Piezoelectricity — perhaps one of the most underrated ...

Social comparison theory is the idea that individuals determine their own social and personal worth based on how they stack up against others. The theory was developed in 1954 by psychologist Leon ...

State Key Laboratory of Crystal Materials, Shandong University, Jinan 250110, China ...

What began with a focus on weather forecasting has evolved toward addressing errors in scientific modeling. In the collaborative environment of the Penn State Institute for Computational and Data ...

Mar. 14, 2025 — Researchers have experimentally recreated another fundamental theoretical model from quantum physics, which goes back to the Nobel Prize laureate Werner Heisenberg. The basis for ...

Mar. 12, 2025 — Physicists have created a new computer code that could speed up the design of the complicated magnets that shape the plasma in stellarators, making the systems simpler and more ...