GEOG 2RC3 : near north

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champagnemouse279

23 Jan 2012

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Regional boundaries physical (vs bone s use of political boundaries) 40% of canada s area; 8% of ppltn. The near north as: transitional region (b/w inhabited south & largely uninhabited north); also, transitional in terms of economy/env t, physical barrier, resources, identity (noridicity degree of northrerness, hinterland region. Low relief due to repeated glaciation (diff. b/w high & low elevation is typically small) Muskeg: bog/marsh formed by the accumulation of decaying organic matter, found in arctic/subarctic env t. Effect on physical env t on settlement: agri settlement limited to clay belts (ont/que. Border: concentration of ppltn on southern edge of region, urban system based on resource towns, mill towns, mining towns company towns linear settlement pattern along rail lines. Due to vast physical expanse region lacks geographic focus 3 sub-regional centers: thunder bay, sudbury, chicoutimi-jonquiere. Physical resource base: forest products wood, pulp & paper, minerals, hydroelectric power.

Related Questions

Vapor cycles
5EM - Thermodynamics
September 2010
1 The T-S diagram
The temperature-entropy diagram is an alternative to the well knownpressure-
volume diagram. Before using it to analyze different vapor cycles,we need
to understand it properly.
1. Plot the following transformations for ideal gases in a T-Sdiagram
(a) Isothermal expansion
(b) Isobaric expansion
(c) Isometric heating
(d) Reversible adiabatic expansion
(e) Irreversible adiabatic expansion
2. Repeat the last question, but this time do it for a realsubstance,
starting in the compressed liquid1 region and ending in thesuperheated
region, when possible. Indicate the boundaries of eachregion.
3. We know that under certain circumstances the area under theplot
in a P-V diagram represents the work performed during theprocess.
What does it represent in this case? Under what assumptions isyour
answer true? Compare examples 6.1 and 6.2.
2 Thermal machines
We understand by thermal machine a device capable of transformingther-
mal energy (heat) into mechanical energy (work). We already knowthat
these machines have a limited efficiency which, in the two-sourcesmodel, is
obtained by Carnotâs cycle.
(Compressed liquid is sometimes also called subcooled liquid)
2.1 Carnot cycle
This cycle, although efficient, is impractical. To begin with, theextreme
temperatures of the cycle should be within the sources temperaturesfor a
finite heat flow to exist.
1. Given the temperature of the sources, draw the cycle accordingto the
named limitation.
2. Show that this leads to lower efficiency than the theoreticallimit.
3. Assume that heat flow from/to the sources is proportional to thetem-
perature difference between them and the working fluid, anddemon-
strate that a higher power output is related to a decreasedefficiency.
2.2 Rankine cycle
Out of the several practical possibilities, Rankine cycle and itsvariations is
widely used, especially for electric power generation.
1. Draw the basic cycle in a T-S diagram and explain it.
2. What does the efficiency of the cycle depend on? Comparewith
Carnotâs.
3. What are the differences between the ideal cycle and the realone?
4. Describe how it is modified by superheating and/or reheating.Explain
te benefits.
2.3 Problems
After answering the previous questions solve the followingexercises from the
book: 8.2, 8.4, 8.5, 8.13, 8.19, 8.20
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3.1 Reverse Carnot cycle
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1. Draw the ideal cycle in a T-S diagram and explain it.
2. Show that this cycle has a theoretical efficiency Ã =Tcold/Thot-Tcold
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2. Plot the actual cycle and explain the differences with the idealcase.
3. How do cascade and multistage systems improve the performanceof
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GEOG 2RC3 : near north

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