Characterization of Anabaena cylindrica Solution System Using Synchronous-Scan Fluorescence Spectroscopy

0　IntroductionF luorescence has been a tool for the study oforganic matter for a long time. The fluores cence of chromophoric constituents of dissolved or ganic matter at blue green wavelengths has been thesubject of many investigations since its first …     

Neolithic rice paddy from the Zhaojiazhuang site, Shandong, China

To identify and study the Neolithic rice paddy in Shandong, eastern China, is not only an important issue in the development of Chinese rice agriculture, but also a key part of the study on rice spread in East Asia. Due to the limitation of archaeological materials and the research methods, there have been no discoveries about the Neolithic rice paddy in Shandong Province for a long time. Based on the identification of possible rice paddy by archaeological excavation, phytolith analysis of soil samples from this "paddy" has been systematically carried out and the results have shown a 4600—4300 years old rice paddy preserved at the Zhaojiazhuang site. This is the first examination and study of the rice paddy in North China by systematic phytolith analysis, which is very important for the Neolithic archaeological research and the study of the eastward spread of rice agricultural techniques in East Asia.     

Air Breakdown During Fires

IntroductionIt has long been accepted that the insulationstrength of air depends upon the air density.Formost operating conditions,changes of the airdensity are due to the changes of the air pressure.However,the high temperatures are occasionallyencountered,for instance,forest fires occur closeto power lines[1] .Although much work has beencarried out at low temperatures,where thetemperature changes are small[2 4] ,there is arelative lack of information for high temperatures,where the pressure …     

A fast construction method for spatial index GBD tree 

This paper proposes a fast initial construction method of the GBDtree. The GDB tree has proper characteristics for management of large amount of 2 or 3 dimensional data. However, the GBDtree needs long initial construction time by originally proposed onebyone insertion method. A fast insertion method has been proposed, but it needs large size of buffer capable to hold index information of all entries. The paper proposes another fast initial construction method. The method requires only limited size of work space (buffer). The experimental results show the initial construction time reduces into a third or a quarter of the onebyone insertion method. The memory efficiency and retrieval efficiency are also improved than the onebyone insertion method.