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Conceptual Client Value Index for Post Disaster Reconstruction Contracting Services
Sadegh Aliakbarlou,Seosamh B. Costello,Seosamh B. Costello,Hyounseung Jang 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
To improve client value within contracting services, it is important to understand what clients value and what theirpriorities are. Following a disaster event, construction service providers are called by clients upon to assist withreconstruction programs. Having knowledge of client values within contracting services in the post disaster situation, serviceproviders are able to provide better service in the disaster rebuild environment. The construction management literature isfocused on business-as-usual construction and its relative values, rather than post disaster reconstruction. The objective ofthis paper is to explore the most important client values within contractor’s services in post disaster reconstruction situationsfrom public and private sector clients’ perspectives. The study includes a literature review and questionnaire survey. Keyclient values within contracting services under the nine Project Management Institute knowledge management categorieswere identified. These values can be used as a basis for developing good practice for reconstruction following a disaster. Aspart of a aim to develop an assessment tool towards improving client value, by providing better contracting services, a clientvalue index is proposed.
Pairwise interaction of drops in shear-thinning inelastic fluids
Sadegh Mohammadi Masiri,Morteza Bayareh,Afshin Ahmadi Nadooshan 한국유변학회 2019 Korea-Australia rheology journal Vol.31 No.1
Inelasticity effects on the migration of a drop and pairwise interaction of drops in a simple shear flow are studied using a finite-difference front-tracking method. The Carreau-Yasuda model is used to adjust the shear-thinning behavior of fluids. Results showed that drop deformation and migration rate of drops in an inelastic system are smaller than those in a Newtonian one. It was revealed that inelasticity has larger effects for the case in which Newtonian drops suspended in a non-Newtonian phase. The time of collision process is shorter for an inelastic system in comparison with the Newtonian one. For two Newtonian drops in an elastic matrix, the results demonstrated that the drops exhibit reversible cross-flow migration at high inelasticity.
Sadegh Vaez-Zadeh,Monir Sadat Hosseini 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.1
By having accurate knowledge of the magnetic field distribution and the thrust calculation in linear synchronous motors, assessing the performance and optimization of the motor design are possible. In this paper, after carrying out a performance analysis of a single-sided wound secondary linear synchronous motor by varying the motor design parameters in a layer model and a d-q model, machine single- and multi-objective design optimizations are carried out to improve the thrust density of the motor based on the motor weight and the motor efficiency multiplied by its power factor by defining various objective functions including a flexible objective function. A genetic algorithm is employed to search for the optimal design. The results confirm that an overall improvement in the thrust mean, efficiency multiplied by the power factor, and thrust to the motor weight ratio are obtained. Several design conclusions are drawn from the motor analysis and the design optimization. Finally, a finite element analysis is employed to evaluate the effectiveness of the employed machine models and the proposed optimization method.
Sadegh Etedali,Mohammad Reza Sohrabi 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.2
In this paper, the rotational behavior of asymmetric base-isolated buildings is compared with the similar asymmetric fixed-base buildings. A vast range of lead rubber bearings with different periods is considered to evaluate the effect of the isolation degree on seismic responses of the structures. The simulation results confirm that the base isolators are able to reduce rotation of stories. However, this reduction is negligible in large eccentricities. The numerical simulations show that increasing period of isolators results in large displacement at bearings located on the flexible edge of the isolation system. This paper proposes practical solutions to reduce torsional responses of the base-isolated structures. In order to investigate the effectiveness of the proposed solutions, four structural models are defined. Considering three earthquake excitations, the simulation results of these models indicate that increase in stiffness of flexible edge of isolation system can reduce torsional responses of asymmetric 3-story base isolated structure. Furthermore, the simultaneous increase in stiffness of flexible edge of isolation system and superstructure lead to a suitable reduction of torsional responses in asymmetric 8-story base-isolated structure.
A New Approach to Improve Induction Motor Performance in Light-Load Conditions
Sadegh Hesari,Aghil Hoseini 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
Induction motors often reach their maximum efficiency at the nominal load. In most applications, the machine load is not equal to the nominal load, thus reduces the motor efficiency and turns a greater percent of power into loss. In this paper, the induction motor control problem has been investigated to reduce the system losses. The Field Oriented Control method (FOC) has been employed in this paper. In this research, the mathematical equations related to system losses are calculated in relation to torque and speed, and then the q- and d-axis are summarized according to the current components. After that, the proposed method is applied along with d- and q-axis. In the recent three decades, many techniques have been suggested to improve the induction motor performance using smart and non-smart methods. In this paper, a new PSO-Fuzzy method have used in real time. The fuzzy logic method serves as speed controller in q-axis and PSO algorithm controls the optimum flux in d-axis. It will be proved
Pounding between adjacent buildings of varying height coupled through soil
Sadegh Naserkhaki,Marwan El-Rich,Farah N.A. Abdul Aziz,Hassan Pourmohammad 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.3
Pounding between adjacent buildings is a significant challenge in metropolitan areas because buildings of different heights collide during earthquake excitations due to varying dynamic properties and narrow separation gaps. The seismic responses of adjacent buildings of varying height, coupled through soil subjected to earthquake-induced pounding, are evaluated in this paper. The lumped mass model is used to simulate the buildings and soil, while the linear visco-elastic contact force model is used to simulatepounding forces. The results indicate while the taller building is almost unaffected when the shorter building is very short, it suffers more from pounding with increasing height of the shorter building. The shorter building suffers more from the pounding with decreasing height and when its height differs substantially from that of the taller building. The minimum required separation gap to prevent pounding is increased with increasing height of the shorter building until the buildings become almost in-phase. Considering the soil effect; pounding forces are reduced, displacements and story shears are increased after pounding, and also, minimum separation gap required to prevent pounding is increased.
Erratum to: Pairwise interaction of drops in shear-thinning inelastic fluids
Sadegh Mohammadi Masiri,Morteza Bayareh,Afshin Ahmadi Nadooshan 한국유변학회 2019 Korea-Australia rheology journal Vol.31 No.2
Erratum to: Korea-Australia Rheology Journal, 31(1), 25-34 (2019).
Sadegh Rostamnia,Turaj Rahmani,Hongchuan Xin 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
A series of ordered mesoporous organic–inorganic hybrid material are designed by using the SO3HfunctionalizedSBA-15 [(PdX2@SBA-15/SO3H or Pd(PrSO3)2@SBA-15) and (Pd-NPs@SBA-15/SO3H or Pd-NPs(PrSO3)@SBA-15)] as solid supports for palladium ions. Among them, the encapsulatedPd(MeCN)2Cl2 into the SBA-15/SO3H and Pd-NPs@SBA-15/SO3H exhibit higher activity and selectivitytoward Suzuki cross-coupling reaction in aerobic condition and water/DMF solvent. These heteroge-neous palladium precatalysts could be separated from the reaction mixture and reused at least 11 times