We construct new supersymmetric SU (5) Grand Unified Models based on Z 4 × Z 2 orientifolds with intersecting D6-branes. Unlike constructions based on Z 2 × Z 2 orientifolds, the orbifold images of the three-cycles wrapped by D6-branes correspond to new configurations and thus allow for models in which, in addition to the chiral sector in 10 and ¯ 5 representations of SU (5), only, there can be...

1. The capacity to perform photosynthesis, given appropriate environmental conditions, is reflected by measurements of the maximum quantum yield of photosystem II ( F v / F m ). The seasonal course of F v / F m may help define the length of the annual photosynthetic period in temperate evergreen forests. 2. F v / F m was measured 31 times from September to May on six conifer species located alo...

In August of 2007 and December of 2007, North American academic researchers, industry representatives and regulators were invited to meetings in Washington and Minneapolis, respectively, with the goal of forming a Software Certification Consortium (SCC). At the first meeting, objectives were established for the consortium and a certification grand challenge was issued. At the second meeting, al...

This paper addresses the changing governance of the social through the conjunction of international, national and local strategies where attempts to both regulate migration and asylum seeking and promote community safety meet. Migration has been increasingly subjected to processes of ‘securitisation’ and ‘criminalisation’ that encounter and align with new pressures in ‘domestic’ and local crime...

Feedbacks among inundation, sediment trapping, and vegetation productivity help maintain coastal wetlands facing sea-level rise (SLR). However, when the SLR rate exceeds a threshold, coastal wetlands can collapse. Understanding the threshold helps address key challenges in ecology-nonlinear response of ecosystems to environmental change, promotes communication between ecologists and resource ma...

This study aims to investigate the different management policies of multi-reservoir systems and their impact on the demand supply and hydropower generation in Great Karun River basin. For this purpose, the semi-distributed simulation-optimization  model of the Great Karun River basin is developed. Also, the multi-objective particle swarm optimization algorithm is applied to optimize the develop...

spatial distribution of thermal regions is dependent on local factors and circulation patterns in long terms. recognition of spatial distribution of temperature in geographical regions could be help on planning and environmental policies. the aim of this paper is recognition and detachment of thermal regions in iran. for this object, maximum daily temperature data have been provided using 620 s...