This research was intended to explore the degree to which leadership practices impacted Jamaican schools’ mathematics achievement. More specifically, the researchers examined Jamaica’s high school students’ CSEC mathematics performance in relation to principals’ instructional leadership behaviors as measured by teachers’ perceptions, using Kouzes and Posner (2003) Leadership Practices Inventory...

Tests of local position invariance (LPI) made by comparing the relative redshift of atomic clocks based on different atoms have been carried out for a variety of pairs of atomic species. In most cases, several absolute frequency measurements per year are used to look for an annual signal, resulting in tests that can span on order of a decade. By using the output of continuously running clocks, ...

landfill leachates are potential threats for environmental degradation. this study was conducted to determine the leachate quality, to identify the dominant pollutants and to evaluate the leachate pollution potential of an active and closed dumping ground of an uncontrolled municipal solid waste landfill site in kolkata, india using leachate pollution index. the results of the physico-chemical ...

Objectives. Current efforts to study fugitive dust (FD) are hampered by the lack of an effective, real-time instrument to measure the broad range of particle sizes that make up FD. To meet this need the overall objective of this project was to develop and evaluate a novel instrument capable of measuring, in real-time, ambient concentrations of particles between approximately 2 and 100 μm. This ...

A s a result of its strong oxidative activity, iron (1) has been hypothesized to be of importance in morbidity and mortality from atherosclerotic cardiovascular disease (CVD) (2). Numerous studies (3) have failed to show a relationship between total body iron and CVD. However, total iron may not be reflective of the risk of oxidative damage mediated by iron. A linkage between iron and CVD is mo...

In living systems iron appears predominantly associated with proteins, but can also be detected in forms referred as labile iron, which denotes the combined redox properties of iron and its amenability to exchange between ligands, including chelators. The labile cell iron (LCI) composition varies with metal concentration and substances with chelating groups but also with pH and the medium redox...

Metabolism is a chemical process used by cells to transform food-derived nutrients, such as proteins, carbohydrates and fats, into chemical and thermal energy. Whenever an alteration of this process occurs, the chemical balance within the cells is impaired and this can affect their growth and response to the environment, leading to the development of a metabolic disease. Metabolic syndrome, a c...

Classified thematic maps based on remote sensing data are usually used to derive Landscape Pattern Index (LPI). However, the classification error can be propagated into the LPIs calculation, while it is usually ignored in the previous literatures. Correctly estimating the LPI error is vital for reliable landscape analysis; however, the widely accepted accuracy assessment method without consider...

We present a summary of experimental tests of Local Position Invariance (LPI) via gravitational red-shift measurement. The results of the Pound-Rebka and Pound-Snider experiments are discussed, as well as those of Gravity-Probe A. A summary of null gravitational red-shift experiments is presented, concluding with the most recently established value of uncertainty in the null red-shift LPI viola...

Publicly available clock correction data from the Global Positioning System was analyzed and used in combination with the results of terrestrial clock comparison experiments to confirm the local position invariance (LPI) of Planck's constant within the context of general relativity. The results indicate that h is invariant within a limit of |β(h)|<0.007, where β(h) is a dimensionless parameter ...