Casual shutterbugs and hardened professional photographers alike need to organize, correct, adjust, and enhance their pictures. We help you choose the right photo editing software for the job. I've ...

Abstract: The use of equinoctial elements and their corresponding variational equations alleviates the problems of singularity and instability that are associated with the classical orbital elements.

Global value chains (GVCs) account for almost 50% of global trade today. Over the past 30 years, they have helped poor countries grow faster, lifting many out of poverty. Trade conflict and the lack ...