1 / 15

Techniques for Searching

Techniques for Searching. The Fourth Pillar Carol Green. Searching Tips. Select topic Put in form of a question Identify keywords (and synonyms) from search question Link with connectors (and/or) Remember plurals and various spellings. Keywords. Keywords derived from

martinwashington
Download Presentation

Techniques for Searching

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Techniques for Searching The Fourth Pillar Carol Green

  2. Searching Tips • Select topic • Put in form of a question • Identify keywords (and synonyms) from search question • Link with connectors (and/or) • Remember plurals and various spellings

  3. Keywords • Keywords derived from • Words in titles • Words in abstracts • Individual words in descriptors (indexing terms)

  4. Controlled Vocabulary • CAB Thesaurus • AGRIVOC • NAL

  5. Sample reference (TreeCD) • Forest Science Database 2000-2005/06.TI: Forecasting volume and economic gains from intensive plantation management using different response curves. • AU: South,-D-B; VanderSchaaf,-C-L; Teeter,-L-D • SO: Southern-African-Forestry-Journal. 2005; (203): 41-47PB: Menlo Park, South Africa: Southern African Institute of Forestry, Suider-Afrikaanse Instituut van Boswese. • LA: English • AB: Proponents of intensive plantation management do not all use the same type of response curves when predicting future volume gains. As a result, some believe that continuously increasing the intensity of management will increase landowner profits and reduce the unit cost of woodproduction (i.e. all silvicultural costs per ha/merchantable cubic metres per ha at harvest). A few believe there is no upper limit to stand productivity while others use response curves that follow the law of diminishing returns. Using loblolly pine (Pinus taeda) data from Georgia as a point of reference, we developed four hypothetical production models (where yield is a function of silvicultural effort). The models that produced apparently unrealistic results were (1) an exponential curve and (2) a linear curve where the costs of growing a cubic metre of merchantable wood (at time of harvest) was inversely related to the discounted cost of intensive silviculture. Although increasing silvicultural effort will often result in more merchantable volume at harvest, the extra wood volume might not be enough to prevent a reduction in net present value of the stand. Harvesting intensively managed loblolly pine stands at age 15 years might not prove economical for a private, non-industrial landowner in the USA if the costs of establishment are too high or if no local mills will purchase logs that contain a high percentage of juvenile wood.. • DE: forest-economics; forest-management; forest-plantations; forests-; intensive-silviculture; merchantable-volume; models-; productivity-; returns-; silviculture-; volume-determination; yield-forecasting

  6. Evaluating Web Resources

  7. Search Engines • Search Engine chart • http://www.searchengineshowdown.com/ features/ • Bothell search engines guide • http://www.bothell.washington.edu/library/guides/subjects/searchengines.html #guides

  8. Web Resources: Myth or Fact • All published material is free to everyone. • Electronic information is better than other forms of information. • Web sources are of equal accuracy, value, authority and currency. • There is no need to distinguish among sources found on the Web.

  9. Evaluating Web Sources • Currency • Accuracy • Authority • Objectivity

  10. Currency • Publication date • Edition or update • Primary or secondary source

  11. Accuracy • Peer-reviewed • Credentials of author or agency responsible • Publication type • Quality • Facts verifiable

  12. Authority • Authors well documented • Credentials and qualifications appropriate • Peer-reviewed • Primary or secondary resource

  13. Objectivity • Purpose of publication • Audience

  14. Evaluation Guides • Johns Hopkins University http://www.library.jhu.edu/researchhelp/ general/evaluating/index.html

  15. Web Site Extensions .edu = educational .org = organization .gov = government .net = network/utilities .mil = military .com = commercial

More Related