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Structural motifs for the BC2N superlattices were identified from a systematic search based on a greedy algorithm. Using a tree data structure, we have retrieved seven structural models for c-BC2N 1x1x lattice which were identified previously by Sun et al. [Phys. Rev. B 64, 094108 (2001)]. Furthermore, the atomic structures with the maximum number of C-C bonds for c-BC2N 2x2x2, 3x3x3, and 4x4x4 superlattices were found by imposing the greedy algorithm in the tree data structure. This new structural motif has not been previously proposed in the literature. A total of up to 512 atoms in the c-BC2N superlattice are taken into consideration. The atoms in these superlattices are in diamond-like structural form. Furthermore, the C atoms, as well as B and N atoms, form the octahedral motif separately. The octahedral structure consisting of C is bounded with {111} facets, and each facet is interfaced to a neighboring octahedral structure consisting of B and N atoms. The electronic and mechanical properties of newly identified low energy structures were analyzed.

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Thesis (doctoral)--Stockholm School of Economics, 1981. / Extra t.p. with thesis statement inserted. Includes bibliographical references.

Thesis--Ph. D., University of Hong Kong, 1983.

published_or_final_version / Physics / Doctoral / Doctor of Philosophy

This thesis demonstrates that by redefining the notion of nationhood and by treating nations and national minorities equally with respect to self-determination, it is possible to formulate basic principles of the international legal system, which would promote territorial integrity and stability of multinational states better than the existing system. I demonstrate that theories dealing with self-determination based solely on human rights or cases of secession address the problem with inadequate tools. I also show that minority-rights approaches do not accommodate self-determination claims of national groups properly. / I offer a new idea of nationhood as a political culture of self-determination with which people self-identify. It includes beliefs about co-nationals' mutual membership in a political community, which is perceived by them as having a self-determining power. Definitions of nationhood which use the notion of culture, but not political culture, are both too inclusive---they fail to distinguish between national and ethnic groups, and too exclusive---they overlook multicultural nations. / Contested secession has received much attention in recent scholarship. Since, however, contested secession is based upon the disagreement of two or more national groups concerning their self-determination within particular boundaries, I consider secession within the scope of a systematic approach to the regulation of relations among national groups. I propose that international legal principles should be based upon the recognition of states and national groups as the two basic elements of the international system, and the equal recognition of nations as political cultures of self-determination. I interpret self-determination as a claim to equality within the boundaries a multinational state, and formulate a criterion of minimal justice for states. It requires that states respect equality of self-determination of national groups on their territory. National groups can secede from multinational states either by mutual agreement, or if their they are persistently denied a status with respect to self-determination equal to that of other national groups.

Thesis (doctoral)--Stockholm School of Economics, 1981. / Extra t.p. with thesis statement inserted. Includes bibliographical references.

Thesis (Ph. D.)--University of Texas at Austin, 1999. / Vita. Includes bibliographical references (leaves 93-94). Available also in a digital version from Dissertation Abstracts.

Thesis (Ph. D.)--University of Washington, 2006. / Vita. Includes bibliographical references (p. 104-105).