Why did a $72 million mission to study water on the moon fail so soon after launch? A new NASA report has the answer.

Update (2025/10/31): Incorporated QOJ OCR data from @cjwen6. Thanks a lot for the contribution! Also added HTTPS. Simplify the statement & remove background by prompting LLM. Embed the simplified ...

Ask the publishers to restore access to 500,000+ books. An icon used to represent a menu that can be toggled by interacting with this icon. A line drawing of the Internet Archive headquarters building ...

Abstract: In this study, a noniterative, convex programming-based optimal guidance is proposed to address field-of-view and acceleration constraints while achieving terminal impact angles. To ...

Abstract: This article presents the study of linear fractional programming (LFP) problems under intuitionistic fuzzy setting. The objective of this paper is to solve ...