37 research outputs found
Establishing Program Standards to Meet the Needs of Postsecondary Trade and Industrial Education
The focus of this study was to develop standards that can be used for establishing and assessing high-quality postsecondary trade and industrial programs. A four-round Delphi technique was used to generate consensus regarding program standards. The panel of experts, comprised of postsecondary administrators of trade and industrial programs, was used to determine which program standards should guide the development and assessment of high-quality trade and industrial education programs. The result was a list of 17 standards and descriptions. The standards included Academic Integration, Advisory Committee, Curriculum, Employer Feedback, Faculty Qualifications, Meaningful Employment, Placement Rates, Program Design, Program Review, Safety, Soft Skills, Student Achievement of Industry Credentials, Student Assessment, Student Advancement, Student Remediation, and Tools and Equipment. Postsecondary administrators can use the results to develop and assess existing programs, as well as to guide the design of new programs that meet industry labor needs
Career and Technical Education Teachers’ Perceptions of Their Profession and Willingness to Encourage Students to Enter a CTE Teaching Career
This study examined the current climate of how Virginia CTE teachers perceive their profession and if they are encouraging their students to enter the teaching profession. A survey developed by the National Center for Education Statistics was submitted to CTE teachers in Virginia (n = 743) to address these questions. Descriptive statistics helped to determine that CTE teachers are generally satisfied with their careers but dissatisfied with factors over which they have no control, and the number of teachers recommending the profession to their students in recent years has decreased considerably. A Pareto analysis was conducted, and the results showed the key reasons why teachers are not recommending the CTE teaching profession to their students are salary/benefits and school variables not in their control
A Connection between Colony Biomass and Death in Caribbean Reef-Building Corals
Increased sea-surface temperatures linked to warming climate threaten coral reef ecosystems globally. To better understand how corals and their endosymbiotic dinoflagellates (Symbiodinium spp.) respond to environmental change, tissue biomass and Symbiodinium density of seven coral species were measured on various reefs approximately every four months for up to thirteen years in the Upper Florida Keys, United States (1994–2007), eleven years in the Exuma Cays, Bahamas (1995–2006), and four years in Puerto Morelos, Mexico (2003–2007). For six out of seven coral species, tissue biomass correlated with Symbiodinium density. Within a particular coral species, tissue biomasses and Symbiodinium densities varied regionally according to the following trends: Mexico≥Florida Keys≥Bahamas. Average tissue biomasses and symbiont cell densities were generally higher in shallow habitats (1–4 m) compared to deeper-dwelling conspecifics (12–15 m). Most colonies that were sampled displayed seasonal fluctuations in biomass and endosymbiont density related to annual temperature variations. During the bleaching episodes of 1998 and 2005, five out of seven species that were exposed to unusually high temperatures exhibited significant decreases in symbiotic algae that, in certain cases, preceded further decreases in tissue biomass. Following bleaching, Montastraea spp. colonies with low relative biomass levels died, whereas colonies with higher biomass levels survived. Bleaching- or disease-associated mortality was also observed in Acropora cervicornis colonies; compared to A. palmata, all A. cervicornis colonies experienced low biomass values. Such patterns suggest that Montastraea spp. and possibly other coral species with relatively low biomass experience increased susceptibility to death following bleaching or other stressors than do conspecifics with higher tissue biomass levels
Robust estimation of bacterial cell count from optical density
Optical density (OD) is widely used to estimate the density of cells in liquid culture, but cannot be compared between instruments without a standardized calibration protocol and is challenging to relate to actual cell count. We address this with an interlaboratory study comparing three simple, low-cost, and highly accessible OD calibration protocols across 244 laboratories, applied to eight strains of constitutive GFP-expressing E. coli. Based on our results, we recommend calibrating OD to estimated cell count using serial dilution of silica microspheres, which produces highly precise calibration (95.5% of residuals <1.2-fold), is easily assessed for quality control, also assesses instrument effective linear range, and can be combined with fluorescence calibration to obtain units of Molecules of Equivalent Fluorescein (MEFL) per cell, allowing direct comparison and data fusion with flow cytometry measurements: in our study, fluorescence per cell measurements showed only a 1.07-fold mean difference between plate reader and flow cytometry data
Zonação de recifes emersos da Área de Proteção Ambiental Costa dos Corais, Nordeste do Brasil
Sierra alternativa. Reconstrucción
Presenta el proceso de reconstrucción de una sierra. Incluye un presupuesto e información sobre dimensionamiento, datos técnicos, montaje de la bobma de avance, funcionamiento, lubricación, normas de seguridad, cimentación y transporte y los esquemas eléctricosTecnólogo en Mecánica IndustrialCuenc