Impact of Student Achievement Through the Use of the Six Traits of Writing Model

This study had two purposes; the first was to study 12 English teachers\u27 scoring of 30 randomly selected student writing samples gathered in the years of 2005, 2006, and 2007 in the Fargo Public School District. The 12 teachers were separated into three groups. Group A (four teachers) served as the control group, as they have been trained and currently score student writing samples. Group B (four teachers) were teachers who have been trained in the use of the Six Traits of Writing Model, but have not scored student writing samples. Group C (four teachers) were teachers who have neither received training using the Six Traits of Writing Model nor scored student writing samples. The second purpose of this study was to investigate the professional development training teachers have received on the Six Traits of Writing Model or other writing programs. A qualitative survey was given to the teachers in Groups A, B, and C to solicit responses and perceptions they have on writing programs. Writing samples using the Six Traits of Writing Model have been collected and scored by the Fargo Public School District trained English teachers beginning in 2002. The Six Traits of Writing Model was first used in this school district beginning the school year of 2002-2003. All teachers in the Fargo Public School District have been trained in using the Six Traits of Writing Model, and, every year, teachers new to the district are trained in using the Six Traits of Writing Model. The Six Traits of Writing Model is incorporated district wide and across every curriculum. The Six Traits of Writing Model focuses specifically on the following six components when analyzing student writing samples. They are ideas and development, organization, word choice, voice, sentence fluency, and conventions and presentation. Based on the data collected, the researcher found that the results revealed that teachers from Groups A, B, and C did score writing samples differently based on training and practice, although it was not significant. Additionally, the qualitative survey provided perceptive data from teachers as to the effectiveness or ineffectiveness of professional development programs used in the past and currently

Bottomland Hardwood Management Demonstrations for South Carolina\u27s Lowcountry Forest Conservation Project

Southern bottomland hardwood forests occur on river floodplains of the southeastern United States, and ecological processes are driven by seasonal floodwaters from the river. Conservation and management of southeastern US coastal plain ecosystems is a priority in South Carolina’s Lowcountry Forest Conservation Project. The project is a partnership of Clemson University, Ducks Unlimited, the Joseph W. Jones Ecological Research Center, Lowcountry Open Land Trust, South Carolina Coastal Conservation League, The Conservation Fund, and The Nature Conservancy. A goal of this project is to create and disseminate economically and ecologically viable methods for conservation-based bottomland hardwood management on private lands, including restoration of degraded forests. Southern bottomland forests have been extensively altered by past cutting practices, as well as past agricultural use, indiscriminate cattle grazing, uncontrolled fires, and lack of attention to regeneration. Early harvest practices included high-grading to remove the most valuable stems, leaving behind the poorest. Repeating this practice through the years has resulted in under-stocked stands of low-quality trees in many forests. Four sites have been selected to establish demonstration areas to show people different management techniques that are currently being used to enhance timber and wildlife values. Funding for the project is provided by the Doris Duke Charitable Foundation. One model of bottomland hardwood management that can be used to achieve conservation goals in the southeastern United States is the system currently practiced by the Anderson-Tully Corporation in bottomland forests of the Mississippi River. The adaptation of this management method is presented here

Vortex line in a neutral finite-temperature superfluid Fermi gas

The structure of an isolated vortex in a dilute two-component neutral superfluid Fermi gas is studied within the context of self-consistent Bogoliubov-de Gennes theory. Various thermodynamic properties are calculated and the shift in the critical temperature due to the presence of the vortex is analyzed. The gapless excitations inside the vortex core are studied and a scheme to detect these states and thus the presence of the vortex is examined. The numerical results are compared with various analytical expressions when appropriate.Comment: 8 pages, 6 embedded figure

The correlation between cell-free DNA and tumour burden was estimated by PET/CT in patients with advanced NSCLC

BACKGROUND: Cell-free DNA (cfDNA) circulating in the blood holds a possible prognostic value in malignant diseases. Under malignant conditions, the level of cfDNA increases but the biological mechanism remains to be fully understood. We aimed to examine the correlation between cfDNA and total tumour burden defined by positron emission tomography (PET) parameters. METHODS: Patients with advanced non-small cell lung cancer (NSCLC) were enrolled into a prospective biomarker trial. Before treatment, plasma was extracted and the level of cfDNA was determined by qPCR. An (18)F-fluorodeoxyglucose ((18)F-FDG) PET/computed tomography (CT) scan was performed and evaluated in terms of metabolic tumour volume (MTV) and total lesion glycolysis (TLG). Tumour contours were delineated semi-automatically by a threshold standardised uptake value (SUV) of 2.5. The primary end point was correlation among cfDNA, MTV and TLG. The secondary end point was overall survival (OS) according to cfDNA, MTV and TLG. RESULTS: Fifty-three patients were included. There were no correlations between cfDNA and MTV (r=0.1) or TLG (r=0.1). cfDNA >75th percentile was correlated with shorter OS (P=0.02), confirmed in a multivariate analysis. MTV>the median was associated with a significantly shorter OS (P=0.02). There was no significant difference in OS according to TLG (P=0.08). CONCLUSION: Cell-free DNA may not be a simple measure of tumour burden, but seems to reflect more complex mechanisms of tumour biology, making it attractive as an independent prognostic marker

The Tate conjecture for K3 surfaces over finite fields

Artin's conjecture states that supersingular K3 surfaces over finite fields have Picard number 22. In this paper, we prove Artin's conjecture over fields of characteristic p>3. This implies Tate's conjecture for K3 surfaces over finite fields of characteristic p>3. Our results also yield the Tate conjecture for divisors on certain holomorphic symplectic varieties over finite fields, with some restrictions on the characteristic. As a consequence, we prove the Tate conjecture for cycles of codimension 2 on cubic fourfolds over finite fields of characteristic p>3.Comment: 20 pages, minor changes. Theorem 4 is stated in greater generality, but proofs don't change. Comments still welcom

Microscopic Structure of a Vortex Line in a Superfluid Fermi Gas

The microscopic properties of a single vortex in a dilute superfluid Fermi gas at zero temperature are examined within the framework of self-consistent Bogoliubov-de Gennes theory. Using only physical parameters as input, we study the pair potential, the density, the energy, and the current distribution. Comparison of the numerical results with analytical expressions clearly indicates that the energy of the vortex is governed by the zero-temperature BCS coherence length.Comment: 4 pages, 4 embedded figures. Added references. To be published in Physical Review Letter

Theory of the optical absorption of light carrying orbital angular momentum by semiconductors

We develop a free-carrier theory of the optical absorption of light carrying orbital angular momentum (twisted light) by bulk semiconductors. We obtain the optical transition matrix elements for Bessel-mode twisted light and use them to calculate the wave function of photo-excited electrons to first-order in the vector potential of the laser. The associated net electric currents of first and second-order on the field are obtained. It is shown that the magnetic field produced at the center of the beam for the $\ell=1$ mode is of the order of a millitesla, and could therefore be detected experimentally using, for example, the technique of time-resolved Faraday rotation.Comment: Submitted to Phys. Rev. Lett. (23 Jan 2008

Formation of a vortex lattice in a rotating BCS Fermi gas

We investigate theoretically the formation of a vortex lattice in a superfluid two-spin component Fermi gas in a rotating harmonic trap, in a BCS-type regime of condensed non-bosonic pairs. Our analytical solution of the superfluid hydrodynamic equations, both for the 2D BCS equation of state and for the 3D unitary quantum gas, predicts that the vortex free gas is subject to a dynamic instability for fast enough rotation. With a numerical solution of the full time dependent BCS equations in a 2D model, we confirm the existence of this dynamic instability and we show that it leads to the formation of a regular pattern of quantum vortices in the gas.Comment: 14 page

Ground-state properties of trapped Bose-Fermi mixtures: role of exchange-correlation

We introduce Density Functional Theory for inhomogeneous Bose-Fermi mixtures, derive the associated Kohn-Sham equations, and determine the exchange-correlation energy in local density approximation. We solve numerically the Kohn-Sham system and determine the boson and fermion density distributions and the ground-state energy of a trapped, dilute mixture beyond mean-field approximation. The importance of the corrections due to exchange--correlation is discussed by comparison with current experiments; in particular, we investigate the effect of of the repulsive potential energy contribution due to exchange--correlation on the stability of the mixture against collapse.Comment: 6 pages, 4 figures (final version as published in Physical Review