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This paper presents an experimental diagnosis on the power performance of a PV system in Hong Kong. The annual solar radiation received by the PV modules was simulated based on the recorded horizontal solar radiation. The theoretical annual energy output of this PV system was about 11,702 kWh/yr, which was higher than the actual energy output by 24.5%. In order to find out the reasons of the energy...
The quick HIV testing method called “MiraWell Rapid HIV Test” uses a specialized testing kit to determine whether an individual’s blood is contaminated with the HIV virus or not. When a drop of blood is placed on the center of the testing kit, a simple pattern will appear in the middle of the kit to indicate the test status, i.e., positive or negative. This HIV test should be done in a small clinic...
It is well known that the Euler characteristic χ and the Hirzebruch index τ of a compact Einstein 4-manifold satisfy the Hitchin–Thorpe inequality χ ≥ $$\tfrac{3}{2}$$ ; |τ|, and that these topological invariants of a compact pseudo-Riemannian Einstein 4-manifold of metric signature (++−−), with certain curvature restrictions, also satisfy a similar inequality χ ≥ $$\tfrac{3}{2}$$ ; |τ|,...
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