Lippmann-Schwinger description of multiphoton ionization

We outline a formalism and develop a computational procedure to treat the process of multiphoton ionization (MPI) of atomic targets in strong laser fields. We treat the MPI process nonperturbatively as a decay phenomenon by solving a coupled set of the integral Lippmann-Schwinger equations. As basic building blocks of the theory we use a complete set of field-free atomic states, discrete and continuous. This approach should enable us to provide both the total and differential cross-sections of MPI of atoms with one or two electrons. As an illustration, we apply the proposed procedure to a simple model of MPI from a square well potential and to the hydrogen atom.Comment: 25 pages, 3 figure

Meta-Analysis of U.S. Wartime Dress Research

Meta-analysis is a research method that can reveal relationships or patterns across several research studies. There has been some research on studying trends of historic clothing and textile research,1 but there has not been a meta-analysis of a single historic style period

We wore “sloppy sweaters [and] tweed skirts:” Proposed styles for the wartime college woman

By Fall 1943 about half of all U. S. college students were women as men left the campuses to fight in World War II. Because of this shift many U.S. colleges tailored their courses and programs to female students.2 National periodicals also focused attention on the coeds. The purpose of this study was to examine proposed styles for college women during WWII to help historians analyze and put into context dress worn by college women during the war. This study aids in understanding of home front life and U.S. consumer behavior during WWII

Integration of NOS Instruction into a Physical Science Content Course for Elementary Teachers: Enhancing Efforts of Teacher Education Programs?

This conference paper was presented at the 2005 NARST Annual Meeting in Dallas, TX.This study investigated the effectiveness of integrating explicit-and-reflective NOS instruction into a physics course for pre-service elementary teachers. Reflective discussions, student scenarios, and content-generic NOS activities were incorporated into both lecture and laboratory components of the course. The VNOS-C was used to assess students' views of NOS prior to and upon completion of the course. Significant and favorable changes in students' views were evident for all the aspects of NOS emphasized, however there were also negative shifts in views apparent in students' views of the socio-cultural embeddedness of science. While positive changes in NOS views resulted from the explicit-and-reflective interventions, there is also evidence that implicit messages about NOS played a role in the development of students' ideas. The results of this study suggest that content courses may be a productive venue for improving preservice teachers' views of NOS

Multiple origins of endosymbionts in Chlorellaceae with no reductive effects on the plastid or mitochondrial genomes

Ancient endosymbiotic relationships have led to extreme genomic reduction in many bacterial and eukaryotic algal endosymbionts. Endosymbionts in more recent and/or facultative relationships can also experience genomic reduction to a lesser extent, but little is known about the effects of the endosymbiotic transition on the organellar genomes of eukaryotes. To understand how the endosymbiotic lifestyle has affected the organellar genomes of photosynthetic green algae, we generated the complete plastid genome (plastome) and mitochondrial genome (mitogenome) sequences from three green algal endosymbionts (Chlorella heliozoae, Chlorella variabilis and Micractinium conductrix). The mitogenomes and plastomes of the three newly sequenced endosymbionts have a standard set of genes compared with free-living trebouxiophytes, providing no evidence for functional genomic reduction. Instead, their organellar genomes are generally larger and more intron rich. Intron content is highly variable among the members of Chlorella, suggesting very high rates of gain and/or loss of introns during evolution. Phylogenetic analysis of plastid and mitochondrial genes demonstrated that the three endosymbionts do not form a monophyletic group, indicating that the endosymbiotic lifestyle has evolved multiple times in Chlorellaceae. In addition, M. conductrix is deeply nested within the Chlorella clade, suggesting that taxonomic revision is needed for one or both genera

Evidence against equimolarity of large repeat arrangements and a predominant master circle structure of the mitochondrial genome from a monkeyflower (\u3ci\u3eMimulus guttatus\u3c/i\u3e) lineage with cryptic CMS

Despite intense investigation for over 25 years, the in vivo structure of plant mitochondrial genomes remains uncertain. Mapping studies and genome sequencing generally produce large circular chromosomes, whereas electrophoretic and microscopic studies typically reveal linear and multi-branched molecules. To more fully assess the structure of plant mitochondrial genomes, the complete sequence of the monkeyflower (Mimulus guttatus DC. line IM62) mtDNA was constructed from a large (35 kb) paired-end shotgun sequencing library to a high depth of coverage (~30x). The complete genome maps as a 525,671 bp circular molecule and exhibits a fairly conventional set of features including 62 genes (encoding 35 proteins, 24 tRNAs, 3 rRNAs), 22 introns, 3 large repeats (2.7, 9.6, 29 kb), and 96 small repeats (40–293 bp). Most paired-end reads (71%) mapped to the consensus sequence at the expected distance and orientation across the entire genome, validating the accuracy of assembly. Another 10% of reads provided clear evidence of alternative genomic conformations due to apparent rearrangements across large repeats. Quantitative assessment of these repeat-spanning read pairs revealed that all large repeat arrangements are present at appreciable frequencies in vivo, although not always in equimolar amounts. The observed stoichiometric differences for some arrangements are inconsistent with a predominant master circular structure for the mitochondrial genome of M. guttatus IM62. Finally, because IM62 contains a cryptic cytoplasmic male-sterility (CMS) system, an in silico search for potential CMS genes was undertaken. The three chimeric ORFs identified in this study, in addition to the previously identified ORFs upstream of the nad6 gene, are the most likely CMS candidate genes in this line. Includes Supplementary Information

Evidence against equimolarity of large repeat arrangements and a predominant master circle structure of the mitochondrial genome from a monkeyflower (\u3ci\u3eMimulus guttatus\u3c/i\u3e) lineage with cryptic CMS

Despite intense investigation for over 25 years, the in vivo structure of plant mitochondrial genomes remains uncertain. Mapping studies and genome sequencing generally produce large circular chromosomes, whereas electrophoretic and microscopic studies typically reveal linear and multi-branched molecules. To more fully assess the structure of plant mitochondrial genomes, the complete sequence of the monkeyflower (Mimulus guttatus DC. line IM62) mtDNA was constructed from a large (35 kb) paired-end shotgun sequencing library to a high depth of coverage (~30x). The complete genome maps as a 525,671 bp circular molecule and exhibits a fairly conventional set of features including 62 genes (encoding 35 proteins, 24 tRNAs, 3 rRNAs), 22 introns, 3 large repeats (2.7, 9.6, 29 kb), and 96 small repeats (40–293 bp). Most paired-end reads (71%) mapped to the consensus sequence at the expected distance and orientation across the entire genome, validating the accuracy of assembly. Another 10% of reads provided clear evidence of alternative genomic conformations due to apparent rearrangements across large repeats. Quantitative assessment of these repeat-spanning read pairs revealed that all large repeat arrangements are present at appreciable frequencies in vivo, although not always in equimolar amounts. The observed stoichiometric differences for some arrangements are inconsistent with a predominant master circular structure for the mitochondrial genome of M. guttatus IM62. Finally, because IM62 contains a cryptic cytoplasmic male-sterility (CMS) system, an in silico search for potential CMS genes was undertaken. The three chimeric ORFs identified in this study, in addition to the previously identified ORFs upstream of the nad6 gene, are the most likely CMS candidate genes in this line. Includes Supplementary Information

D'yakonov-Perel' spin relaxation for degenerate electrons in the electron-hole liquid

We present an analytical study of the D'yakonov-Perel' spin relaxation time for degenerate electrons in a photo-excited electron-hole liquid in intrinsic semiconductors exhibiting a spin-split band structure. The D'yakonov-Perel' spin relaxation of electrons in these materials is controlled by electron-hole scattering, with small corrections from electron-electron scattering and virtually none from electron-impurity scattering. We derive simple expressions (one-dimensional and two-dimensional integrals respectively) for the effective electron-hole and electron-electron scattering rates which enter the spin relaxation time calculation. The electron-hole scattering rate is found to be comparable to the scattering rates from impurities in the electron liquid - a common model for n-type doped semiconductors. As the density of electron-hole pairs decreases (within the degenerate regime), a strong enhancement of the scattering rates and a corresponding slowing down of spin relaxation is predicted due to exchange and correlation effects in the electron-hole liquid. In the opposite limit of high density, the original D'yakonov-Perel' model fails due to decreasing scattering rates and is eventually superseded by free precession of individual quasiparticle spins.Comment: 16 pages, 5 figure

Microwave Gaseous Discharges

Contains reports on five research projects.United States Atomic Energy Commission (Contract AT (30-1) 1842