Which California School Districts Have the Most Dropouts?

Compares high school dropout rates between districts as well as between traditional and non-traditional schools. Includes a link to data on numbers of schools, enrollment, numbers of dropouts, and dropout rates, by county, district, and type of school

Ethnic and Gender Differences in California High School Graduation Rates

Presents data on the disparities in graduation rates among African-American, Asian, Latino/Hispanic, and white students as well as between boys and girls within each group

Trainee competence and the status relationship between the trainee and trainers as determinants of trainers\u27 evaluation of the trainee\u27s performance.

Several investigations (Rosenthal and Jacobsen, 1968; Lanzetta and Hannah, 1969; Ring and Farina, 1969) have shown that manipulating the information given to a trainer concerning a trainee whom he is to teach results in changes in the trainer\u27s evaluation of the trainee\u27s performan Thus, Rosenthal and Jacobson (1968) told teachers in a public school that certain of their students would show marked improvement during the following year. At the end of the year, those students did show an improvement on standardized measures of achievement and intelligence greater than that found for the general student population

Історія розвитку принципу збереження теплоти

(uk) У статті розкрито етапи формування поняття принципу збереження теплоти.(en) The stages of forming of concepttion of principle of maintainanceof warmth are exposed in the article

Effects of external global noise on the catalytic CO oxidation on Pt(110)

Oxidation reaction of CO on a single platinum crystal is a reaction-diffusion system that may exhibit bistable, excitable, and oscillatory behavior. We studied the effect of a stochastic signal artificially introduced into the system through the partial pressure of CO. First, the external signal is employed as a turbulence suppression tool, and second, it modifies the boundaries in the bistable transition between the CO and oxygen covered phases. Experiments using photoemission electron microscopy (PEEM) together with numerical simulations performed with the Krischer-Eiswirth-Ertl (KEE) model are presented.Comment: 15 pages, 7 figures, accepted in J. Chem. Phy

Data acquisition from digital holograms of particles

A technique for data acquisition from digital holograms of particle ensembles, including preprocessing of the digital hologram, construction of a two-dimensional display of the holographic image of investigated volume, and segmentation and measurement of particle characteristics is considered. The proposed technique is realized in automatic regime and can work in real time. Results of the technique approbation using digital holograms of sand, plankton particles in water, and air bubbles in oil are presented

Simple reflection anisotropy microscopy set-up for CO oxidation studies

Reflection anisotropy microscopy (RAM) is a tool to monitor the optical anisotropy of surfaces with spatial resolution (Rotermund et al 1995 Science 270 608–10). It has been applied to pattern formation during CO oxidation on Pt(110), where it provides a high sensitivity for surface reconstruction and partially also for the coverage with reaction educts (Heumann 2000 Dissertation TU-Berlin). However, the spatial resolution of RAM and the alignment procedure of the optical components were not satisfactory. Here, we give a detailed description of a new set-up, which employs a simple polarizing beam splitter cube as an analyser instead of a Foster prism, offering a higher spatial resolution (<10 μm) and easier alignment of the optical components while retaining the high sensitivity for surface structure. Polarization contrast and spatial resolution of the new set-up are systematically measured, and applications to CO oxidation on uniform and microstructured Pt(110) single crystals are presented

Period doubling and spatiotemporal chaos in periodically forced CO oxidation on Pt(110)

Periodic forcing of chemical turbulence in the catalytic CO oxidation on Pt(110) can induce a period doubling cascade to chaos. Using a forcing frequency near the second harmonic of the system's natural frequency, and carefully increasing the forcing amplitude, the system successively exhibits spiral wave turbulence, resonant pattern formation, and chaotic oscillations. In the latter case, global coupling induces strong spatial correlation. Experimental results are presented as well as numerical simulations using a realistic model. Good agreement is found between experiment and theory. The results give further insight into the complex nature of reaction-diffusion systems and are of high importance regarding control strategies on such systems. The presented setup enhances the range of achievable dynamical states and allows for new experimental investigations on the dynamics of extended oscillatory systems