22 research outputs found
A Curriculum of Activities and Materials Used in Teaching Decomposition and Flowcharting Skills in Grades 5-7
This curriculum project provides instructional activities and materials to be used in teaching decomposition and flowcharting skills to students in grades 5-7. It is indicated and supported by research that the use of a variety of activities geared toward problem solving are of great value to students who will make use of decomposition and flowcharting. This project is specifically designed for teachers in grades 5-7 who wish to prepare their students for programming activities on the microcomputer. The criteria for selection of activities and materials are included. This project includes activities categorized under one of the following headings: sequencing activities, selecting information activities, flowcharting activities, and working with computer activities. Finally, the materials and activities used in this project are listed by source so that teachers might find other references that could be helpful in teaching decomposition and flowcharting to students in grades 5-7
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Elevated tritium levels at the World Trade Center
Traces of tritiated water (HTO) were detected at [the]World Trade Center (WTC) ground zero after the 9/11/01 terrorist attack. A method of ultralow-background liquid scintillation counting was used after distilling HTO from the samples. A water sample from the WTC sewer, collected on 9/13/01, contained 0.174 plus or minus 0.074 (2s) nCi/L of HTO. A split water sample, collected on 9/21/01 from the basement of WTC Building 6, contained 3.53 plus or minus 0.17 and 2.83 plus or minus 0.15 nCi/L, respectively. Several water and vegetation samples were analyzed from areas outside the ground zero, located in Manhattan, Brooklyn, Queens, and Kensico Reservoir. No HTO above the background was found in those samples. All these results are well below the levels of concern to human exposure