Extracting Electron Densities in N-Type Gaas from Raman Spectra: Theory

Extracting Electron Densities in N-Type Gaas from Raman Spectra: Theory
Author: Herbert S. Bennett
Publisher: DIANE Publishing
Total Pages: 127
Release: 2010
Genre: Technology & Engineering
ISBN: 1428988254

Presents the theory for calculating Raman line shapes as functions of the Fermi energy and finite temperatures in zinc blende, n-type GaAs for donor densities between 10 to the 16th cm -3 and 10 to the 19th cm -3. Compared to other theories, this theory is unique in two respects: (1) the many-body effects are treated self-consistently; and (2) the theory is valid at room temperature for arbitrary values of the ratio R = (Q to the 2nd/alpha), where Q is the magnitude of the normalization wave vector and alpha is the normalized frequency used in the Raman measurements. These calculations solve the charge neutrality equation self-consistently for a two-band model of GaAs at 300 K that includes the effects of high carrier concentrations and dopant densities on the perturbed densities of states used to calculate the Fermi energy as a function of temperature. Illus.

Domestic Net Migration in the U. S.

Domestic Net Migration in the U. S.
Author: Marc J. Perry
Publisher: DIANE Publishing
Total Pages: 99
Release: 2008-04
Genre: Social Science
ISBN: 1428987770

Migration is playing a larger role in population redistribution within the U.S. With birth & death rates currently low & largely similar across the country, natural increase (the excess of births over deaths) exerts less influence than it used to in explaining why some regions, states, or counties have faster population growth than others. This report describes recent patterns of population redistribution reflected in the domestic net migration component of population estimates data. Analysis focuses on net migration for a number of different kinds of geographic areas, including regions, divisions, states, metropolitan & micropolitan statistical areas, & counties. Charts & tables.

Growing Up Alone

Growing Up Alone
Author: Maggie Black
Publisher: DIANE Publishing
Total Pages: 126
Release: 2008-04
Genre: Social Science
ISBN: 1428987789

The 1989 Convention on the Rights of the Child attaches key importance to the family¿s role in nurturing & raising the child. The child¿s interests are best served by staying with the family, even in times of war or misfortune, unless the home is abusive. Despite this widely accepted principle, increasing numbers of children are growing up alone. The cause of this epidemic is the acute poverty endured by millions of families in Africa, Asia, Latin Amer. & Central & Eastern Europe -- reinforced by causes such as warfare & the HIV/AIDS pandemic. Contents: What is the scale of the problem?; Experiencing growing up alone; Bolstering families; Programs for family well-being; Speaking out for children growing up alone; & A UK agenda for action. Illustrations.

Medicare and You 2008

Medicare and You 2008
Author:
Publisher: DIANE Publishing
Total Pages: 125
Release: 2008
Genre: Health insurance
ISBN: 1428987819

The official government handbook with important information on the Medicare health & prescription drug plan choices in your area, tips on what to consider when comparing plans, & resources where you can get detailed information & personalized help. Contents: List of Topics/Index; Section 1: Medicare Basics; Medicare¿s Covered Services (Part A & Part B); Section 2: Your Plan Choices: Decide How to Get Your Medicare Benefits; Original Medicare Plan; Medicare Advantage Plans (Part C); Other Medicare Health Plans. The information in this handbook is good from Jan. 1, 2008, through Dec. 31, 2008.