Tan spot disease of wheat: race characterization.

bitstream/CNPT-2010/40702/1/p-do84.pd

Extended interface states enhance valley splitting in Si/SiO2

Interface disorder and its effect on the valley degeneracy of the conduction band edge remains among the greatest theoretical challenges for understanding the operation of spin qubits in silicon. Here, we investigate a counterintuitive effect occurring at Si/SiO2 interfaces. By applying tight binding methods, we show that intrinsic interface states can hybridize with conventional valley states, leading to a large ground state energy gap. The effects of hybridization have not previously been explored in details for valley splitting. We find that valley splitting is enhanced in the presence of disordered chemical bonds, in agreement with recent experiments.Comment: 4 pages, 4 figure

Extended interface states enhance valley splitting in Si/SiO2

Interface disorder and its effect on the valley degeneracy of the conduction band edge remains among the greatest theoretical challenges for understanding the operation of spin qubits in silicon. Here, we investigate a counterintuitive effect occurring at Si/SiO2 interfaces. By applying tight binding methods, we show that intrinsic interface states can hybridize with conventional valley states, leading to a large ground state energy gap. The effects of hybridization have not previously been explored in details for valley splitting. We find that valley splitting is enhanced in the presence of disordered chemical bonds, in agreement with recent experiments.Comment: 4 pages, 4 figure

Pion dissociation and Levinson's theorem in hot PNJL quark matter

Pion dissociation by the Mott effect in quark plasma is described within the generalized Beth-Uhlenbeck approach on the basis of the PNJL model which allows for a unified description of bound, resonant and scattering states. As a first approximation, we utilize the Breit-Wigner ansatz for the spectral function and clarify its relation to the complex mass pole solution of the pion Bethe-Salpeter equation. Application of the Levinson theorem proves that describing the pion Mott dissociation solely by means of spectral broadening of the pion bound state beyond T_Mott leaves out a significant aspect. Thus we acknowledge the importance of the continuum of scattering states and show its role for the thermodynamics of pion dissociation.Comment: 18 pages, 6 figure

Influences of Instructionally Planned Experiential Learning Strategies on Student Perceptions of Learning

Research in leadership and education reveals consensus among educators that leadership can be taught. Educators are exploring how leadership should be taught believing that students learn best from personal experiences. Experiential learning provides an instructional framework for student centered learning grounded in student experiences and course content. The purpose of the study is to qualitatively assess the degree to which experiential learning in undergraduate leadership courses, facilitated by faculty planning, influences the perception of student learning. Using a phenomenological research method, one interview with the instructor of an undergraduate leadership course at a private, Midwestern four-year university was conducted about course planning. One interview was conducted with students enrolled in the course to assess student perceptions of learning. Three students out of eight enrolled in the course volunteered for participation in interviews. Findings indicated that experiential learning was utilized for instructional planning as a component of adult learning and the instructor’s teaching philosophy. They also indicated students are learning from experiential learning planned by the instructor, including preference for in-class teams and in-class exercises, as well as personal experiences and experiences of classmate’s occurring outside of the classroom

EC94-852 Cash Flow Planning Form

This extension circular covers the following areas of a cash flow planning form: Beginning Cash Balance, Operating Sales (crop and hay, market livestock, livestock product, custom work); Capital Sales (breeding livestock, machinery and equipment); Personal Income (wages, interest); Operating Expenses (car/truck, chemicals, conservation, custom hire, feed purchased, fertilizers and lime, freight and trucking, gasoline, fuel and oil, insurance, labor hired, rents and leases, repairs and maintenance, seeds and plants, storage, warehousing, supplies, taxes, utilities, veterinary, breeding fees and medicine, feeder livestock); Capital Purchases (breeding livestock, machinery and equipment, family living withdrawals, personal investments, income and social security, term loan payments); Net Cash Available (operating loan borrowings, operating loan payments); and Ending Operating Loan Balance. Along with the Cash Flow Planning Form is a Projected Income Statement Form which covers Projected Business Income (operating sales, breeding livestock, estimated cash income adjustments, estimated gross revenues, estimated value of production); Project Business Expenses (cash operating, esimated operating, prepaid and supplies, cash investment in growing crops, accounts payable); Projected Net Income Summary (estimated net income from operations, estimated net business income, estimated net income after taxes, estimated earned net worth change); and a Physical Inventory Flows Worksheet

The Initial Conditions of Clustered Star Formation III. The Deuterium Fractionation of the Ophiuchus B2 Core

We present N2D+ 3-2 (IRAM) and H2D+ 1_11 - 1_10 and N2H+ 4-3 (JCMT) maps of the small cluster-forming Ophiuchus B2 core in the nearby Ophiuchus molecular cloud. In conjunction with previously published N2H+ 1-0 observations, the N2D+ data reveal the deuterium fractionation in the high density gas across Oph B2. The average deuterium fractionation R_D = N(N2D+)/N(N2H+) ~ 0.03 over Oph B2, with several small scale R_D peaks and a maximum R_D = 0.1. The mean R_D is consistent with previous results in isolated starless and protostellar cores. The column density distributions of both H2D+ and N2D+ show no correlation with total H2 column density. We find, however, an anticorrelation in deuterium fractionation with proximity to the embedded protostars in Oph B2 to distances >= 0.04 pc. Destruction mechanisms for deuterated molecules require gas temperatures greater than those previously determined through NH3 observations of Oph B2 to proceed. We present temperatures calculated for the dense core gas through the equating of non-thermal line widths for molecules (i.e., N2D+ and H2D+) expected to trace the same core regions, but the observed complex line structures in B2 preclude finding a reasonable result in many locations. This method may, however, work well in isolated cores with less complicated velocity structures. Finally, we use R_D and the H2D+ column density across Oph B2 to set a lower limit on the ionization fraction across the core, finding a mean x_e, lim >= few x 10^{-8}. Our results show that care must be taken when using deuterated species as a probe of the physical conditions of dense gas in star-forming regions.Comment: ApJ accepte