The Risk of Reliance on Perceived Risk

Professor Cross\u27s comment is closely related to the debate between Thompson and Valverde. Using examples that do not commonly appear in the Risk literature, he argues that: Giving weight to perceived Risk may seem liberal insofar as it gives more say to the little guy, but giving perceived Risk too much weight could have distinctly illiberal social consequences

Exterior Differential Systems for Yang-Mills Theories

Exterior differential systems are given, and their Cartan characters calculated, for Maxwell and SU(2)-Yang-Mills equations in dimensions from three to six.Comment: This is a contribution to the Special Issue "Elie Cartan and Differential Geometry", published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGM

Preparatory space experiments for development of a CELSS

The goal of Closed Ecological Life Support System (CELSS) studies is to examine the effects of microgravity on yield and quality of plant products and on the interactions between irradiance and crop area. Measuring yield and quality of crops as a function of irradiance in microgravity is virtually unique to the CELSS program, as is the emphasis on canopies rather than individual plants. The first step for space experiments is to develop a relatively stress free environment for plant growth, something that has so far never been achieved. High light levels are essential, and there must be time enough to complete a significant portion of the life cycle. Optimal atmosphere and nutrients must be provided. Such responses as germination, orientation of roots and shoots, photosynthesis and respiration, floral initiation and development, and seed maturation and viability will be studied