The influence of teachers\u27 beliefs on literacy instruction for at-risk first graders: A multiple case study

Through a multiple case study design the influence of teachers\u27 beliefs on literacy instruction for at-risk first graders was examined and described. A volunteer sample included five female teachers who taught in different high risk schools within the same school district. Five research questions guided the study: (1) What are teachers\u27 beliefs about instructing young at-risk children to read and write? (2) What do teachers say they do as they instruct young at-risk children to read and write? (3) What do teachers actually do as they instruct young at-risk children to read and write? (4) What influences teachers\u27 instructional decisions as they teach young at-risk children to read and write? (5) Are there congruencies between teachers\u27 stated beliefs and their practice?;Data were collected from interviews, observations, questionnaires and a reflective activity over an academic year. Through the constant comparative method twelve general findings emerged: (1) Teachers must possess an understanding of the individual needs of at-risk children and address those needs; (2) Teachers must recognize and build on children\u27s individual strengths; (3) Teachers should nurture children\u27s enthusiasm for learning to read and write; (4) The learning process should begin at the appropriate developmental level; (5) At-risk children should be continuously stimulated in order to build confidence necessary for learning. A structured environment is important to accomplishing this goal; (6) At-risk children break the bonds of at-riskness by becoming literate; (7) Literacy instructional theory does not influence teachers\u27 practice as much as their beliefs; (8) There is no single method of literacy instruction for at-risk children, a combination of pedagogical approaches best serves their literacy needs; (9) Teacher modeling is a positive motivational factor for at-risk children learning to read and write; (10) All at-risk children can learn; Other findings indicated: (1) Teachers\u27 literacy instructional decisions are influenced by multiple factors; (2) There are congruencies between teachers\u27 stated beliefs and practice; The five case studies validate the work of previous researchers who suggested that teachers\u27 beliefs are an integral part of classroom practice. The teachers provided documented instances of the congruency between beliefs and classroom practice

Lean value marketing programs

Recent promotion of the National Pork Producers Lean Guide to Pork Value has focused attention on providing pork producers with an economic incentive to raise lean, meaty hogs. The packing industry version of this value-based idea is generally termed a grade and yield program. While each individual packing plant may have its own grade and yield program, several factors need to be considered when marketing hogs grade and yield, regardless of the packing plant. The preferred weight range for a packing plants grade and yield program must be known. Packing plants available to Kansas usually range from 210-240 lb or from 220-250 lb. If your hogs fall below or above the preferred weight range, price discounts will begin. Generally, the farther a pig is outside the preferred weight range, the greater the discount.; Swine Day, Manhattan, KS, November 20, 198

Gamow-Jordan Vectors and Non-Reducible Density Operators from Higher Order S-Matrix Poles

In analogy to Gamow vectors that are obtained from first order resonance poles of the S-matrix, one can also define higher order Gamow vectors which are derived from higher order poles of the S-matrix. An S-matrix pole of r-th order at z_R=E_R-i\Gamma/2 leads to r generalized eigenvectors of order k= 0, 1, ... , r-1, which are also Jordan vectors of degree (k+1) with generalized eigenvalue (E_R-i\Gamma/2). The Gamow-Jordan vectors are elements of a generalized complex eigenvector expansion, whose form suggests the definition of a state operator (density matrix) for the microphysical decaying state of this higher order pole. This microphysical state is a mixture of non-reducible components. In spite of the fact that the k-th order Gamow-Jordan vectors has the polynomial time-dependence which one always associates with higher order poles, the microphysical state obeys a purely exponential decay law.Comment: 39 pages, 3 PostScript figures; sub2.eps may stall some printers and should then be printed out separately; ghostview is o.

Determination of Fluorescence Polarization and Absorption Anisotropy in Molecular Complexes Having Threefold Rotational Symmetry

The current work concerns investigation of the polarization properties of complex molecular ensembles exhibiting threefold (C3) rotational symmetry, particularly with regard to the interplay between their structure and dynamics of internal energy transfer. We assume that the molecules or chromophores in such complexes possess strongly overlapped spectra both for absorption and fluorescence. Such trimeric structures are widely found in biological preparations, as for example the trimer of C-phycocyanin (C-PC). Higher order aggregates, e.g. hex-amers and three-hexamer rods, are also investigated and compared with the trimer case. The theory addresses both steady-state and 8-pulse excitation and establishes some links between them. Monochromophoric, bichro-mophoric and trichromophoric molecular complexes are individually examined. For steady-state excitation, analytical formulas are reported for the degree of fluorescence polarization and absorption anisotropy. It is shown that the polarization is dependent on the chromophore inclination relative to the symmetry axis, the relative efficiencies of absorption and fluorescence by chromophores of different spectral types, and the rates of energy equilibration. To assess the validity of the theory, it has been applied to C-PC aggregates. Here it was found that different C-PC aggregates provide practically identical polarization response. For S-pulse excitation we give analytical formulas for determination of the fluorescence depolarization, and also the depolarization associated with absorption recovery, both for a monochromophoric trimer and some particular cases of bichromophoric trimer. More complicated systems are analyzed by computer modeling. Thus it transpires that the initial polarization anisotropy r(t = 0) takes the value 0.4 for all considered aggregates; the long-time limit r(t →∞) has about the same value as is associated with steady-state excitation. We also show that with steady-state excitation the degree of fluorescence polarization is practically equal for various C3 aggregates of C-PC, and that the major factor determining the polarization is the chromophore orientation relative to the symmetry axis