42,717 research outputs found
Space propulsion systems. Present performance limits and application and development trends
Typical spaceflight programs and their propulsion requirements as a comparison for possible propulsion systems are summarized. Chemical propulsion systems, solar, nuclear, or even laser propelled rockets with electrical or direct thermal fuel acceleration, nonrockets with air breathing devices and solar cells are considered. The chemical launch vehicles have similar technical characteristics and transportation costs. A possible improvement of payload by using air breathing lower stages is discussed. The electrical energy supply installations which give performance limits of electrical propulsion and the electrostatic ion propulsion systems are described. The development possibilities of thermal, magnetic, and electrostatic rocket engines and the state of development of the nuclear thermal rocket and propulsion concepts are addressed
On the Exponential Decay of the n-point Correlation Functions and the Analyticity of the Pressure
The goal of this paper is to provide estimates leading to a direct proof of
the exponential decay of the n-point correlation functions for certain
unbounded models of Kac type. The methods are based on estimating higher order
derivatives of the solution of the Witten Laplacian equation on one forms
associated with the hamiltonian of the system. We also provide a formula for
the Taylor coefficients of the pressure that is suitable for a direct proof the
analyticity
Effect of tomato variety, cultivation, climate and processing on Sola l 4, an allergen from Solanum lycopersicum
Tomatoes (Solanum lycopersicum) are one of the most consumed vegetables worldwide.
However, tomato allergies in patients suffering from birch pollen allergy occur frequently.
Due to highly similar protein structures of the tomato allergen Sola l 4 and the major birch
pollen allergen Bet v 1, patients cross-react with allergenic proteins from tomato as well as
other fruits or vegetables. The aim of this study was to quantify Sola l 4 in various tomatoes
differing in color, size and shape for identification of varieties with a reduced allergen level.
Therefore, an indirect competitive ELISA using a specific polyclonal Sola l 4 antibody was
developed. In addition, two varieties, both cultivated either conventionally or organically and
furthermore dried with different methods, were analyzed to investigate the influence of the
cultivation method and processing techniques on Sola l 4 level. Within 23 varieties, Sola l 4
content varied significantly between 0.24 and 1.71 μg Sola l 4/g FW. The tomato cultivars
Rugantino and Rhianna showed the significantly lowest level, whereas in cultivars Farbini
and Bambello the significantly highest concentration was determined. Drying of tomatoes in
the oven and by sun resulted in a significant decrease. The thermal instability was verified
for the recombinant Sola l 4 emphasizing the results for the native protein in dried tomato
samples. Overall, the Sola l 4 content is cultivar-dependent and no correlation between
color and Sola l 4 amount was found. During the drying process of tomatoes Sola l 4 level
was significantly reduced due to thermal instability. Growing conditions have a minor effect
whereas seasonal effects show a more pronounced impact. These findings could extend
the knowledge about the allergen level of different tomato varieties and may help to improve
food safety to potentially increase the life quality of patients suffering from birch pollen
allergy
Review on the configurations of hybrid electric vehicles
Author name used in this publication: Edward W. C. LoRefereed conference paper2009-2010 > Academic research: refereed > Refereed conference paperVersion of RecordPublishe
Overview of building integrated photovoltaic (BIPV) systems in Hong Kong
Author name used in this publication: Edward W. C. LoVersion of RecordPublishe
Recent projects of building integrated photovoltaic in Hong Kong
Author name used in this publication: Edward W. C. LoVersion of RecordPublishe
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