Composites are engineered or naturally occurring materials made from two or more
constituent materials with significantly different physical or chemical properties which
remain separate and distinct within the finished structure. Basically, they can be
categorized into two major types, i.e., structural composites with outstanding
mechanical properties and functional composites with various outstanding physical,
chemical or electrochemical properties. They have been widely used in a wide variety
of products, e.g.
So far the scientific community agrees that the earthquake
prediction is impossible. In fact, scientists can not predict the exact location,
intensity and duration of an earthquake to strike a particular area. Scientists still do not
know much about the details of the physical processes associated with earthquakes and their
The initial survey showed a high level of spatial heterogeneity in the location of industries in Jepara.
For subsequent sampling and more detailed analysis of a subset of these enterprises, the area was
divided into squares, each of which would be independently surveyed. The theoretical optimal size
of the squares was calculated using the standard interpolation method, with weighted distances.
Details are given in Annex 1 and the resulting grid is illustrated in Figure 2.
The spatial heterogeneity is so extreme that 80% of the workshops are located in only 17% of the