A number of recent papers have argued that invariants do not exist for three dimensional point sets in general position 3, 5, 22]. This has often been misinterpreted to mean that invariants cannot be computed for any three dimensional structure. This paper proves by example that although the general statement is true, invariants do exist for structured three dimensional point sets. Projective i...

the topic of citizenship is an issue that many scholars from different point of views have paid attention to this concept. we can see and recognize some dimensions of citizenship in the works of greek and islamic philosophers. in this article, we examine the most important dimension of citizenship i.e. behavior. under the light of this research, as we can see in islamic religious texts, there a...

periodic vehicle routing problem focuses on establishing a plan of visits to clients over a given time horizon so as to satisfy some service level while optimizing the routes used in each time period. this paper presents a new effective heuristic algorithm based on data mining tools for periodic vehicle routing problem (pvrp). the related results of proposed algorithm are compared with the resu...

transformationprocessesdebate ontheinteractionsbetween archaeological artifacts  and structures based on their natural and cultural environments. these processes provide a good picture about the site formation after its creation until now. recognition of these processes and their context help archaeologists to interpret archaeological data in an appropriate way. in this paper i would argue abou...

as one of the systematizing philosophers, kant holds some views on education and training in general and religious education in particular. the present article introduces his views on religious education with its necessity and scope. organized in four parts, this article attempts to study the theoretical foundotions of kant's view on religious education by exploring his works. in the first...

drama is an obvious cultural activity. this literary form is a means of solidarity between human beings and opens new horizons for dialogue among races, ethnicities and different colors in spite of different point of views, opinions and beliefs. drama is proper for applying national themes and calling for freedom, rising against oppression and resistance. the present article surveys the works o...

In annual plants with determinate growth, sugar accumulation signals high carbon availability once growth has ceased, resulting in senescence-dependent nutrient recycling to the seeds. However, this senescence-inducing effect of sugars is abolished at cold temperature, where sugar accumulation is important for protection. Here, natural variation was exploited to analyse the effect of chilling o...

In recent years, renewable energy sources have been considered the most encouraging resources for grid and off-grid power generation. This paper presents an improved current control strategy for a three-phase photovoltaic grid-connected inverter (GCI) under unbalanced and nonlinear load conditions. It is challenging to suppress the harmonic content in the output current below a pre-set value in...