走向2030:中国空间天文的发展与展望

天文是人类认识太空、探索宇宙的一门科学,而空间天文则侧重于利用空间观测设备来对太空和宇宙进行科学研究。本文首先介绍了国际上天文的发展,以及现代天文学科学研究的主要方向和核心问题。其次,侧重于介绍我国空间天文的发展,并以搜索失踪的重子问题为例介绍若干空间天文研究的重点方向。最后,介绍我国天文机构对空间天文的研究和支持,以及对今后发展的展望。

Existence of Multiple Positive Solutions for Higher-Order p-Laplacian Boundary Value Problems

The existence of multiple positive solutions for a class of higher order p Laplacian boundary value problem is studied. By means of the Leggett Williams fixed point theorem in cones, existence criteria which ensure the existence of at least three positive solutions of the boundary value problem are established.