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Recent improvements in UV Raman spectrometer capability have resulted from the availability of much improved dielectric filters, and we can now observe directly both the longitudinal and the transverse optic phonon modes of the wide-bandgap zincblende semiconductor MgS. We are, thus, able to confirm the earlier measured and calculated phonon frequencies with improved accuracy. The strong sequence of overtone modes that we observe is interpreted in terms of the resonance behavior of the Raman scattering process at this excitation energy. The spectra also show features which, by comparison to ab-initio calculations of the phonon dispersion and density of states, can be identified as arising from multiple Raman scattering processes involving longitudinal acoustic phonons near the Brillouin zone boundary.
The spin flip Raman scattering signals associated with the Mn2+ 3d5 electrons in a range of CdTe-based dilute magnetic semiconductor quantum well structures is shown to be sensitive to even very weak above-barrier illumination, as are the quantum-well photoluminescence from exciton and trion recombination and acoustic phonon Raman scattering signals excited in resonance with the quantum well. This surprising degree of sensitivity is discussed in terms of the modulation of the carrier densities in the quantum wells, leading to a modulation of the resonant intermediate state for Raman scattering and, therefore, of the scattering cross section. Depending on the majority intrinsic carrier type in the quantum wells, we show that either enhancing or quenching of the Raman signals can result.
Six years have passed since the International Conference on Nuclear Data forScience and Technology held in Santa Fe, New Mexico, U.S.A., 2004 (ND-2004)where this author presented a similar invited paper. The present paperdiscusses the progress made since 2004 in the production of covarianceevaluations and their usage in applications. It also points out thechallenges ahead for the nuclear science community in this field. The pathto be be followed during the next several years in this field is fairlyclear, but several barriers need to be overcome along the way. Among theseare resource limitations (funding and manpower), constraints of existingnuclear data formats, applications code shortcomings, and the need toeducate experimenters on how to properly quantify and report uncertaintiesin their measured data. These barriers are not insurmountable, but thenuclear data and applications communities need to give thoughtfulconsideration to setting priorities and making the technical choices thatwill impact the work of an entire generation of applied nuclear researchers.
The potential for global warming and climate change has increased the focus of research on plant genes that respond to high temperatures. Previous research identified a temperature-sensitive miniature soybean mutant that was controlled by a single gene. The objectives of our research were to confirm the single-gene control and to determine the genomic location of this gene. Segregation of the combined progeny of four BC6F5 plants heterozygous for the miniature trait in a Tracy-M background confirmed that the trait was conditioned by a single gene (1:2:1, χ2=4.38, P=0.1120). Molecular marker analysis identified three SSR markers and a SNP marker on molecular linkage group B2 (chromosome 14) associated with segregation for the miniature trait. One of these, marker Satt560, cosegregated perfectly with the miniature trait. The data from these four polymorphic markers indicated that the gene conditioning this miniature phenotype is at or near Satt560. Given this newly identified location of the gene and the recently published soybean genomic sequence, it may be feasible to isolate the gene and determine its mechanism of action in responding to temperature. Such knowledge may be of use in understanding how plants respond to increased temperature.
In the United States, research undertaken by specialists in sport pedagogy started in the mid-to-late 1970s. Initially, the focus was on effective teaching of physical education in schools. Within a short time period, however, other researchers focused their efforts on studying effective physical education teacher education (PETE). In actuality, the findings and ideas generated by both groups of researchers were used by some American Kinesiology departments, mostly situated in research universities, as the basis for how they trained their undergraduate preservice teachers within their PETE programs. The Department of Kinesiology within the University of Alabama is one such department. My primary purpose during this presentation will be to describe the research- based PETE program that I helped build at the University of Alabama and have worked in for 25 years. In addition, I will highlight some of the research I have conducted on this program with graduate students and colleagues. Specifically, I will focus on two areas: (a) research carried out on the occupational socialization of our preservice teachers and (b) research conducted on our preservice teachers` teaching within the curriculum model of sport education. As well as attempting to answer questions from the delegates at the conference as is customary, I will conclude the presentation by asking the following questions of the delegates: (a) How do Korean PETE programs differ from our program in terms of organizational structure? (b) How do Korean PETE programs differ from our program in terms of their theoretical and research-based frameworks? (c) Do Korean PETE programs employ a models-based approach? and (d) Is there any research on the effectiveness of Korean PETE programs using occupational socialization as the theoretical framework?
The true motivation behind North Korea`s nuclear weapons program may be known only to Kim Jong-Il and his military advisers. Nevertheless, through an analysis of a state`s bargaining positions, rhetoric, and military decisions, it is possible to create a strategic profile that can help to determine its primary interests and probable future choices. In North Korea`s case, it appears that defensive objectives are paramount, with its nuclear program serving either as a source of exchange in return for a security guarantee, or a means to deter the United States from taking aggressive action. The troubling possibility is that due to North Korea`s dire financial situation, reprocessed plutonium from the Yongbyon reactor will find its way onto the black market and into the hands of terrorists, despite the best efforts of the Proliferation Security Initiative (PSI). This may be an unlikely prospect, given that to date North Korea has only exported its missile technology, and not any Weapons of Mass Destruction (WMD). However, circumstances may change, or an unexpected coup could create a scramble for nuclear material beyond international control. This dire prospect should drive U.S. negotiators to be more flexible and conciliatory in its settlement efforts, since there are few other credible options and time is very much on North Korea`s side.
채경육,D.,W.,Bardayan,J.,C.,Blackmon,M.,S.,Smith,A.,E.,Champagne,J.,J.,Das,R.,P.,Fitzgerald,D.,W.,Visser,V.,Guimaraes,K.,L.,Jones,S.,D.,Pain,J.,S.,Thomas,M.,S.,Johnson,R.,L.,Kozub,R.,J.,Livesay,Z.,Ma,C. 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.11
Knowledge of the <sup>3</sup>He(<sup>3</sup>He,<sup>2</sup><i>p</i>)<sup>4</sup>He reaction is important for understanding stellar burning and solar neutrino production. Previous measurements have found a surprisingly large rise in the cross section at low energies that could be due to a low-energy resonance in the <sup>3</sup>He + <sup>3</sup>He (<sup>6</sup>Be) system or electron screening. In the <sup>6</sup>Be nucleus, however, no excited states have been observed above the first 2<sup>+</sup> state at <i>E<sub>x</sub></i> = 1.67 MeV up to 23 MeV, even though several are expected. The <sup>2</sup>H(<sup>7</sup>Be,<sup>3</sup>H)<sup>6</sup>Be reaction has been studied for the first time to search for resonances in the <sup>6</sup>Be nucleus that may affect our understanding of the <sup>3</sup>He(<sup>3</sup>He,<sup>2</sup><i>p,</i>)<sup>4</sup>He reaction. A 100-MeV radioactive <sup>7</sup>Be beam from the Holifield Radioactive Ion Beam Facility (HRIBF) was used to bombard CD<sub>2</sub> targets, and tritons were detected by using the silicon detector array (SIDAR). A combination of reaction mechanisms appears to be necessary to explain the observed triton energy spectrum.