Event Structure and the Perfect

A Perfect Specialization Model for Gravity Equation in Bilateral Trade based on Production Structure

Although initially originated as a totally empirical relationship to explain the volume of trade between two partners, gravity equation has been the focus of several theoretic models that try to explain it. Specialization models are of great importance in providing a solid theoretic ground for gravity equation in bilateral trade. Some research papers try to improve specialization models by addi...

Haplotype Block Partitioning and tagSNP Selection under the Perfect Phylogeny Model

Single Nucleotide Polymorphisms (SNPs) are the most usual form of polymorphism in human genome.Analyses of genetic variations have revealed that individual genomes share common SNP-haplotypes. Theparticular pattern of these common variations forms a block-like structure on human genome. In this work,we develop a new method based on the Perfect Phylogeny Model to identify haplo...

Schur-Pair Property and the Structure of Varietal Covering Groups

Altan derivatives of a graph

Altan derivatives of polycyclic conjugated hydrocarbons were recently introduced and studied in theoretical organic chemistry. We now provide a generalization of the altan concept, applicable to any graph. Several earlier noticed topological properties of altan derivatives of polycyclic conjugated hydrocarbons are shown to be the properties of all altan derivatives of all graphs. Among these ar...

Risk analysis of an urban environment under explosive attacks in Tehran

  Purpose: In recent years high explosive bomb attacks have been increasingly directed against   civil structures by various terrorist organizations. This paper describes a numerical method for   assessing the interaction of high explosive air blast within the complex geometrical type of a   congested urban environment.   Materials and Methods: The first step in predicting blast effects on a ta...

The Interpretation of Tense and Aspect in English

An analysis of English tense and aspect is presented that specifies temporal precedence relations within a sentence. The relevant reference points for interpretation are taken to be the initial and terminal points of events in the world, as well as two "hypothetical" times: the perfect t ime (when a sentence contains perfect aspect) and the progressive or during time. A method for providing tem...