France seeks revised role in space station

Space Hierarchy Theorem Revised

We show that, for an arbitrary function h(n) and each recursive function ‘(n), that are separated by a nondeterministically fully space constructible g(n), such that h(n)∈0(g(n)) but ‘(n) ∈ 0(g(n)), there exists a unary language L in NSPACE(h(n)) that is not contained in NSPACE(‘(n)). The same holds for the deterministic case. The main contribution to the well-known Space Hierarchy Theorem is t...

Space Station Alpha Joint Bearing

Perhaps the most critical structural system aboard the Space Station is the Solar Alpha Rotary Joint which helps align the power generation system with the sun (Figure 1). The joint must provide structural support and controlled rotation to the outboard transverse booms as well as power and data transfer across the joint. The Solar Alpha Rotary Joint is composed of two transition sections and a...

An Algorithm for Disk Space Management to Minimize Seeks

The past decade has witnessed a proliferation of reposito ries whose workload consists of queries that retrieve information These repositories provide on line access to vast amount of data and serve as an integral component of many applications e g library information systems scienti c applications and the entertainment industry Their storage subsystems are expected to be hierarchical consistin...

Space Shuttle Space Station Radio Frequency ( W ) Exposure Analysis

This paper outlines the modeling techniques and important parameters to define a rigorous but practical procedure that can verify the compliance of RF exposure to the NASA standards for astronauts and electronic equipment. The electromagnetic modeling techniques are applied to analyze RF exposure in Space Shuttle and Space Station environments with reasonable computing time and resources. The m...

International Space Station life science research funding.