Iris Publishers Journal Of Engineering Sciences

  Increasing Durability of Weak Lime Mortars Using Saturated Solution of Calcium Hydroxide or Barium Hydroxide, Aachen City Wall, Germany, Case Study Authored by Serdar Koltuk Introduction Lime mortars have been broadly used in the Medieval period in building as it has been considered as friendly mortar to the building stones as well as to the environment. Chester City walls at Chester City, UK as well as other Medieval structures had been built from natural sandstone blocks cemented with such hydraulic lime mortar [1]. Not only that but also the ancient Medieval Aachen City walls, Germany have also been built from fine grained sandstone cemented with such type of mortars [2]. Recently, such type of mortars become week and easily weathered by the severe and aggressive weathering processes (particularly salts created from acid rains, de-icing salt ...etc.) acting on all building materials [2-5]. Increasing durability of such weak mortars using some additives becomes a must. Unf...

  Biological Processes In Urban Mines Authored by Navarro Hidalgo Keywords: Critical elements; Microorganisms; Urban mines; Biological processes; Recycling Introduction The innovation and development of high technology have demanded the exploration of some chemical elements in greater quantity. These elements have physicochemical properties of high economic interest. Some countries have larger amounts of the reserves of these elements, creating an imbalance in world supply. An example of the use of these materials are rare earth elements widely used in equipment with greater energy efficiency and magnets in wind generators. They are also present in increasingly modern computers, cell phones and televisions. Given this reality, thiswork proposes to recover critical elements from alternative sources (electronic waste - REE) using a biological process as a tool for  solubilization of waste elements with subsequent recovery. The proposed technique is bio-hydrometallurgy, already...

  Study Regarding Input Data Consideration (Required Accelerograms) for Experimental Test of The Optimal Moment Resisting (MR) Reinforced Concrete(RC) Frame Model on The Seismic Platform Authored by Sococol Ion A significant number of reinforced concrete (RC) frame models have been studied for seismic (ductile) performance purpose through nonlinear static analyses (using ATENA software). In these conditions, it was chosen the optimal models for experimental test on the seismic platform. In next stage, it was used the existing pushover curves to establish the ground acceleration values for five performance requirements (objectives). Thus, it was generated for each performance requirement an artificial accelerogram with which optimal RC frame model can be tested on the seismic platform. Consequently, it will be possible to study the complex cracking mechanism and failure/ split/ rupture/ expulsion material process of the RC frame model at each experimental test for either performanc...

  CUDA-based Accelerated FEM Calculation Authored by Cankun Zheng The Finite Element Method (FEM) had been widely used in engineering applications. There are two bottleneck issues in the FEM calculation. The first one is how to minimize computer memory demand so that to be able to run large-scale simulations using limited computational resources. The second one is how to carry out simulation as fast as possible to complete a large-scale simulation job. A standard finite element analysis always results in solving simultaneous linear equations. Overall, a global stiffness matrix of a finite element simulation often has sparse, symmetric, and positive definite characteristics. To overcome the first issue, we proposed integrating and storing stiffness matrix using the Compressed Sparse Row (CSR) format in this paper. We proposed to carry out parallel computing to solve simultaneous equations using the cuBlAS, cuSPARSE, and cuSOLVER libraries on the Compute Unified Device Architecture ...

  Renewable Energy in Architecture “Used Techniques to Achieve Green Net Zero Energy Buildings” Authored by Ashraf A Gaafar There are various negatives to use non-renewable energy resources, it consumes the exhaustible resources, as well as their use produces emissions that affect and pollute the environment and cause major changes in global climate. On the global level, we find the construction field is a key consumer of energy and natural resources, therefore, its participation is essential to achieve the sustainable development. The buildings and constructions are mainly responsible for the gas emissions that cause the global warming. Therefore, the importance of keeping and saving the energy, to keep resources from running out and reduce CO2 emissions which cause the global warming. The research reviews current techniques in addressing energy problems in buildings. The research consists of three parts; Part one reviews the concept of new and renewable energy in general, the se...