slascc talk 032311

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Praxis: Where Theory Meets Practice

In Aviation and Librarianship

SLA Southern California Chapter

23 March 2011by Sara R. Tompsonwith Eric Sharp

[email protected]@usc.edu

1. AGENDA

2. Introductions – around the room

3. Definition

4. Aviation Theory into Practice overview

5. Librarianship Theory into Practice overview

6. DIY!

+Definitions

Praxis: “Action or practice; spec. the practice or exercise of a technical subject or art, as distinct from the theory of it” (OED)

Aviation: Foundation = physics theories that are demonstrably provable and immutable; largely a science

Librarianship: A profession because of theoretical foundations; mostly a social “science;” will use cataloging/classification illustration --most structured, least mutable aspect

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[email protected] / SLA SCC March 2011

+ Foundational Theories of Flight: Atmosphere3


R.Sharp mod of FAA illus.

E.g.: Air = 14.7 PSI; based on column

of air from sea level to

stratosphere.

Flight is based upon

well as water.

Flight is based upon and obeys laws or

rules of our universe.Including the laws of

fluid dynamics –these apply to air as

well as water.

+ Foundational Theories of Flight: Wings/Airfoils (Newton, 1643-1728; Bernoulli, 1700-1782)

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R.Sharp and S. Tompson mod of FAA illus.

A wing is a “foil.” as A wing is a “foil.” as are airplane and

boat propellers; they reduce turbulence and create down

pressure.

Molecules of air deflect off the bottom of the wing; per Newton, the wing is pushed up. ~ 70% of “lift” comes from this action.

The air molecules going OVER the top of the wing MUST reach the end at the same time as those going under it, so they have to go faster, so lower pressure per Bernoulli. ~ 30% of “lift” is due to this decreased pressure.

+ Foundational Theories of Flight: 4 Forces of Flight (Straight & Level = Zero ratios: Lift=Weight, Thrust=Drag)

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See this NASA site for kids and teachers for really good explanations! http://www.grc.nasa.gov/WWW/K-12/airplane/thrust1.html

+ Foundational Theories of Flight: The Stall illustrates an imbalance in the forces; you can only bend the rules so far!

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The angles The angles measured in

degrees are “angles of attack” – the

airfoil in relation to the fluid air.

Slow flight, less air molecules going over wing; must increase angle of

attack to get more molecules travelling; BUT over ~ 18 degrees of angle, uneven

fluid flow, eddies in the air current –like in a stream around rocks; too much

eddying, the airfoil is said to “stall.”

+ Foundational Theories of Flight: Let’s Do It! Stall Practice Illustrated

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From WikiversityAirplane Flying Handbook

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Charles Jewett (1816-1868): “Universal Catalog” requires some standardization and cooperation

Charles Cutter (1837-1903): “The convenience to the public is always to be set before the ease of the cataloger”; make items discoverable for users

Seymour Lubetzy (1893-2003): Principle of Authorship (personal AND corporate) as key access point; also findability; translations

Paris Principles, 1961: natural title standardization; entries and headings guides; reemphasis on Jewett and Cutter objectives

1940s: ALA and LC back and forth; bibliographic description-based; format types expanded; differentiation of serials, monographs

(from: Chan, Lois May. Cataloging and Classification. 3rd ed. (Lanham, MD: Scarecrow Press, 2007).

Foundational Theories of Cataloging8


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1960s to date: AACR and daughters: entry and description RULES; 2=international standardization; more on nonprint; punctuation standards; hierarchy of rules

MARC (1960s to date): Fixed coded fields; format, punctuation, separation standards for other record fields; 856 field for urls; etc.

RDA/MARC 21 (currently being implemented): Resource Description & Access

LCSH (1898 to date): Hierarchical taxonomy of subject headings; arguably users’ favorite entry point; “authority” and “control” key concepts that aid discoverability – Also NAME authority lists

Metadata Schemas (1990s to date): Dublin Core, MODS, etc.

Social tagging/folksonomies: Fun but chaotic? Your thoughts?

(most from: Chan, Lois May. Cataloging and Classification. 3rd ed. (Lanham, MD: Scarecrow Press, 2007).

Foundational Theories of Cataloging, contin.9


+ Cataloging Example: Even LC varies!10

POP QUIZ!What are some of these fields?!

What would you do different locally?


+ Illustrating Aviation: Paper Gliders! *Prizes*! furthest flight; closest guess on LC or Dewey call #

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http://www.funpaperairplanes.com/Plane%20Downloads.html


My husband’s method which I will demonstrate

If you want to try another method at home

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[email protected] [email protected] or [email protected]

Me and my buddy Robin at Edwards AFB Dry Lakebed Fly-In 1 Oct 2010!! Our chapter gets to go there in May!

slascc talk 032311

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