Seasonal variation of the ionic alkyllead species composition of rainwater
Article Abstract:
A study of the seasonal variations in the concentration levels of ionic alkyllead species in rainwater analyzed 57 samples over a 1.5-year period. The research indicated that concentration levels were lower during the summer. This was probably caused by a higher rate of atmospheric photochemical degradation. The study of concentration levels can help to determine a biogeochemical cycle of lead and to identify the negative biological and environmental effects of tetra-alkyllead compounds used in gasoline.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1992
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Relationship between alloy composition and tool-life of high-speed steel twist drills
Article Abstract:
The influence of the alloy composition of high-speed steel twist drills on the devices' performance are studied by means of tool-life tests. Experiments are conducted wherein several alloy-treated high-speed steel matrix twist drill specimens with low residual carbide content are fabricated and subjected to actual tooling processes. Results show that the drills' tool-life depends largely on the structures' matrix properties rather than their alloy composition.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1992
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Seasonal control of tuberization in potato: Conserved elements with the flowering response
Article Abstract:
The progress in the identification of the molecular mechanisms that define the day-length recognition in potato is described. Results show that common regulatory pathways are involved in both flowering and tuberization photoperiodic responses in plants.
Publication Name: Annual Review of Plant Biology
Subject: Science and technology
ISSN: 1040-2519
Year: 2006
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