Aggregate base plays an important role in a pavement structure. It supports the asphalt concrete (AC) layer and reduces the wheel load-induced stresses on the underlying layers so that the stresses transmitted to the subgrade do not result in excessive deformation. The base layer also functions as a drainage layer. Consequently, it is important to understand the drainage and strength characteri...

It is well known that the performance of hot mix asphalt (HMA) in service life is closely related to a proper aggregate gradation. A laboratory study was conducted to investigate the effects of nominal maximum aggregate size (NMAS) on the performance of stone matrix asphalt (SMA). The volumetric characteristics and performance properties obtained from wheel tracking tests, permeability test, be...

Human embryonic stem cell research can bring about major biomedical breakthroughs and thus contribute enormously to human welfare, yet it raises serious moral problems because it involves using human embryos for experiment. The ‘‘moral status of the human embryo’’ remains the core of such debates. Three different positions regarding the moral status of the human embryo can be categorised: the ‘...

When a composite of nonlinear particles suspended in a host medium is subjected to a sinusoidal electric field, the electrical response in the composite will generally consist of alternating current (ac) fields at frequencies of higher-order harmonics. The situation becomes more interesting when the suspended particles are graded, with a spatial variation in the dielectric properties. The local...

OBJECTIVE To review the evidence on the efficacy of different types of existential therapies: a family of psychological interventions that draw on themes from existential philosophy to help clients address such issues in their lives as meaning and death anxiety. METHOD Relevant electronic databases, journals, and reference lists were searched for eligible studies. Effects on meaning, psychopa...