Download 6-Tecniques for Sear..

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
– Words in titles
– Words in abstracts
– Individual words in descriptors (indexing
terms)
Controlled
Vocabulary
• CAB Thesaurus
• AGRIVOC
• NAL
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, SuiderAfrikaanse 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 wood production (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
Evaluating Web Resources
Search
Engines
• Search Engine chart
• http://www.searchengineshowdown.com/
features/
• Bothell search engines guide
• http://www.bothell.washington.edu/library/g
uides/subjects/searchengines.html
#guides
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.
Evaluating Web
Sources
•
•
•
•
Currency
Accuracy
Authority
Objectivity
Currency
• Publication date
• Edition or update
• Primary or secondary source
Accuracy
• Peer-reviewed
• Credentials of author or agency
responsible
• Publication type
• Quality
• Facts verifiable
Authority
•
•
•
•
Authors well documented
Credentials and qualifications appropriate
Peer-reviewed
Primary or secondary resource
Objectivity
• Purpose of publication
• Audience
Evaluation
Guides
• Johns Hopkins University
http://www.library.jhu.edu/researchhelp/
general/evaluating/index.html
Web Site
Extensions
.edu = educational
.org = organization
.gov = government
.net = network/utilities
.mil = military
.com = commercial