Study on algebraic varieties related to moduli spaces and algebraic cycles

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Algebraic variety is the geometric object which is defined by somepolynomials. It is a fundamental object to study in mathematics. In our research, westudied algebraic varieties in characteristic p > 0, and we defined the notions of a-number,b-number and h-number. We made clear the relations between them, and gave someapplications. We also studied superspecial K3 surfaces in characteristic 2, and 3. We gaveinteresting configurations of non-singular rational curves on them and determined therelation between the configurations and the lattice theory.