We describe a simple undergraduate exercise involving the titration of a weak acid by a strong base using a pH meter and a micropipette. Students then use their data and carry out graphical analyses with a spreadsheet. The analyses involve using mathematical concepts such as first-derivative and sem
Understanding and facilitating the browsing of electronic text
β Scribed by ELAINE G. TOMS
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 470 KB
- Volume
- 52
- Category
- Article
- ISSN
- 1071-5819
No coin nor oath required. For personal study only.
β¦ Synopsis
Browsing tends to be used in two distinctive ways, alternatively associated with the goal of the activity and with the method by which the goal is achieved. In this study, the de"nition of browsing combines aspects of both concepts to de"ne browsing as an activity in which one gathers information while scanning an information space without an explicit purpose. The objective of this research was to examine how browsers interact with their browsing environment while manipulating two types of interface tools constructed from the content.
(1) Menus: these were considered a stable device facilitating navigation, orientation and route "nding. One version was presented in traditional hierarchical form while the other displayed all levels of the hierarchy simultaneously.
(2) 00Items-to-browse11 tools: these were meant to encourage meandering and diversion and to prime the browsing activity. One version displayed automatically a set of Suggestions while the second was a typical Search Tool.
Forty-seven adults (24 males) performed the two types of tasks (one with no purpose and the second, a control, purposeful) in four sessions over a period of four weeks. Participants scanned and/or searched the textual content of current issue plus three months of back issues of the Halifax Chronicle Herald/Mail Star using a system designed speci"cally for this research. At any one time only one of each type of tool was available.
Those with no assigned goal examined signi"cantly more articles and explored more menu options. They made quick decisions about which articles to examine, spending twice as much time reading the content. They tended not to explore the newspaper to a great extent, examining only 24% of the articles in a single issue. About three-quarters of what they examined was new information on topics that they had not known about before being exposed to the paper. The type of menu had no impact on performance, but di!erences were discovered between the two items-to-browse tools. Those with no goal selected more articles from the Suggestions and found more interesting articles when the Suggestions were available.
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