An-Najah National University

About: An-Najah National University is a education organization based out in Nablus, Palestinian Territory. It is known for research contribution in the topics: Population & Adsorption. The organization has 1857 authors who have published 2607 publications receiving 68226 citations. The organization is also known as: An Najah National University.

Techno-economic assessment of on-grid solar PV system in Palestine

Abstract: This paper presents the analysis of obtained result from continuous data monitoring of a 41 kWp solar PV system installed on the rooftop of faculty of medicine building at An-Najah National Univers...

Hybrid renewable energy system for a remote area in UAE

Abstract: The remote areas in the United Arab Emirates (UAE) doesn’t have access to the electricity grid, therefore the standalone hybrid power system uses to provide the electrical power required to meet the demand in these areas. The components of the hybrid system were selected and optimized for this area instead of bringing the gird to this area based on the load profile for the appliance household in the area. Thousands of simulation trials were performed using HOMER Pro to achieve the best renewable fraction and Levelized cost of energy (LCOE). The LCOE was found 0.34 $/kWh after including the capital, recourses, operation and maintenance, and replacement cost for the lifetime of the project which is 25 years. The unmet electrical load and shortage capacity were 0.0102 % and 0.0912 %, respectively. Furthermore, the environmental impact of the system was compared with the diesel energy system based on the carbon footprint and emission as in carbon dioxide, carbon monoxide, unburn hydrocarbon, sulfur dioxide, and nitrogen oxide. The carbon footprint was 90.1 which equivalent to 1000 saving diesel gallons.

Assessing façade visibility in 3d city models for city marketing

Abstract: In city marketing, different applications require the evaluation of the visual impression of displays in the urban environment on people that visit the city. Therefore, this research focuses on the way how visual displays on facades for movie performances are perceived during a cultural event triggered by city marketing. We describe the different visibility analysis methods that are applicable to the analysis of facades. The methods advanced from the domains of Geographic Information Science, architecture and computer graphics. A detailed scenario is described in order to perform a requirements analysis for identifying the requirements to visibility information. This visibility information needs to describe the visual perception of displays on facades adequately. The requirements are compared to the visibility information that can be provided by the visibility methods. A discussion of the comparison summarizes the advantages and disadvantages of existing visibility analysis methods for describing the visibility of facades. The results show that part of the researched approaches is able to support the requirements to visibility information. But they also show that for a complete support of the entire analysis workflow, there remain unsolved workflow integration issues.

Impact of exposure spatial resolution on seismic loss estimates in regional portfolios

Abstract: The spatial resolution of exposure data has a substantial impact on the accuracy and reliability of seismic risk estimates. While several studies have investigated the influence of the geographical detail of urban exposure data in earthquake loss models, there is also a need to understand its implications at the regional scale. This study investigates the effects of exposure resolution on the European loss model and its influence on the resulting loss estimates by simulating dozens of exposure and site models (630 models) representing a wide range of assumptions related to the geo-resolution of the exposed asset locations and the associated site conditions. Losses are examined in terms of portfolio average annual loss (AAL) and return period losses at national and sub-national levels. The results indicate that neglecting the uncertainty related to asset locations and their associated site conditions within an exposure model can introduce significant bias to the risk results. The results also demonstrate that disaggregating exposure to a grid or weighting/relocating exposure locations and site properties using a density map of the built areas can improve the accuracy of the estimated losses.

Relativistic symmetry of position-dependent mass particles in a Coulomb field including tensor interaction

Abstract: The spatially-dependent mass Dirac equation is solved exactly for attractive scalar and repulsive vector Coulomb potentials, including a tensor interaction under the spin and pseudospin symmetric limits. Closed forms of the energy eigenvalue equation and wave functions are obtained for arbitrary spin—orbit quantum number κ. Some numerical results are also given, and the effect of tensor interaction on the bound states is presented. It is shown that tensor interaction removes the degeneracy between two states in the spin doublets. We also investigate the effects of the spatially-dependent mass on the bound states under spin symmetric limit conditions in the absence of tensor interaction.