260 research outputs found
Investigation of Bird Strike Damage on Fokker 100 Airplane Wing and Nose
Full text linkBird strike or the collision of birds to the flying airplane is one of the common threats which reduces the safety of flying vehicles. Numerical analysis is so important to predict the behavior of airplanes body and nose in birds strike and it plays an important role to reduce the project cost and prevent unexpected damages. In this paper, it is tried to study the influence of birds strike on Fokker 100 airplane using the finite element method. In order to verify the proposed method, an experimental bird strike on a plane is studied. Then birds strike on the airplane wing and nose are numerically studied to investigate the amount of damage due to this phenomenon
Technical and economical optimization of CHP systems by using gas turbine and energy recovery system
No full textEnergetic study of gasification system for bio-waste as renewable energy resource: Case study
No full textThe expenses, which caused by pollution and limited fossil resources, have convinced scientists to concentrate on renewable resources such as biological waste. Conversion of bio-waste to syntheses gas produces higher heating values in comparison to conventional bioenergy production methods. To produce energy from bio waste, it is important to study on existing technology and using CHP and gas turbines. In this paper a plan for producing electricity and heat at the same time by using bio waste has been proposed. This plan provides a method to produce hybrid gas (combined gas) by using solid bio-waste of Tehran in two forms of wet and dry as a renewable energy resource and steam in a fixed bed gas reactor. This gas is a combination of Hydrogen, Carbon monoxide, Carbon dioxide Water and some amount of Methane. Selected temperature and pressure for the reactor respectively is1900 [F] and 390 [Psi]. As indicated in the results, the best air and steam combination entering fixed bed reactor among 60 different combinations for dry waste is 0.2% of entering fuel volume for steam 0.25% of entering fuel volume for air heating value for this combination is 6471 [BTU/lb]. Furthermore, for the steam volumes of 1.5% to 0.9%, the percentage of H 2 in the syngas increases by enhancing the volume of air content
Coordination behavior of chelidamic acid With VV, NiII, FeIII, and CaII: Syntheses, X-ray characterization and DFT studies
No full textFour new complexes of chelidamic acid (H3cda) in the presence of 2-aminopyrimidine (apym) or 2,4,6-triamino-1,3,5-triazine (tata) as external ligands, namely (apymH)[VO2(Hcda)]⋅H2O (1), [Ni(Hcda)(apym)(H2O)2]⋅H2O (2), (apymH)[Fe(Hcda)2] (3), and (tataH)2(tata)2[Ca2(cda)2(H2O)6]⋅H2O (4) were synthesized. X-ray diffraction analysis of 1-4 revealed the formation of 3D frameworks generally involving weak interactions (mainly H-bonds) between metal complexes of chelidamic acid, protonated or deprotonated external ligands apym or tata and co-crystallized water molecules. Some complexes present remarkable assemblies in the solid state governed by unconventional noncovalent interactions that have been analyzed by means of DFT calculations. Solution studies were also performed to fully characterize the new compounds
Extended structures in copper(II) complexes with 4-hydroxypyridine-2,6-dicarboxylate and pyrimidine derivative ligands: X-ray crystal structure, solution and magnetic studies
No full textThree new copper(II) complexes of chelidamic acid (H(3)cda) and pyrimidine derivatives, namely [Cu-2 (Hcda)(2)(ampym)(2)]center dot 5H(2)O (1) and [Cu-2(Hcda)(2)(apym)(H2O)(2)]center dot 2H(2)O (2), and (Hapym)(2)[Cu(Hcda)(2)]center dot 4H(2)O (3) (ampym = 2-amino-4-methylpyrimidine, apym = 2-aminopyrimidine) have been synthesised in mild conditions starting from the proton transfer compounds (Hampym)(2)(Hcda) and (Hapym)(2)(Hcda). X-ray diffraction analysis revealed the formation of extended structures featuring dinuclear (1 and 2 with pyrimidine derivatives as metal bridges) or mononuclear (3) Hcda(2) copper(II) complex units joined via H-bonds mainly involving coordinated and lattice water molecules and the coordinated Hcda(2) ligands. Solution studies, magnetic measurements and thermal analyses were performed to fully characterise the new compounds. (C) 2014 Elsevier B. V. All rights reserved
Dataset for 'Effect of damping on performance of magnetostrictive vibration energy harvester'.
No full textSupporting Matlab M file - Code for modelling of Energy Harvester Access is currently subject to embargo (09/07/23). For more information please contact the corresponding author, Mojtaba Ghodsi
Corrigendum: Confirmatory factor analysis and gender invariance of the Persian version of psychological control scale: association with internalizing and externalizing behavior problems (Frontiers in Psychology, (2023), 14, (1128264), 10.3389/fpsyg.2023.1128264)
No full textCopyright © 2024 Habibi Asgarabad, Salehi Yegaei, Mokhtari, Izalnoo and Trejos-Castillo. cc-byIn the published article, there was an error in the correspondence details. As well as Pardis Salehi Yegaei, Mojtaba Habibi Asgarabad should also be listed as a corresponding author. The complete correspondence details are shown below: *Correspondence: Pardis Salehi Yegaei Mojtaba Habibi Asgarabad The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated
ORIGINAL ARTICLE Strategic Stakeholder Modelofthe Banking System, Mining: Bank SARMAYE Mojtaba Mali; Strategic Stakeholder Modelofthe Banking System, Mining: Bank SARMAYE
No full textABSTRACT Effective organization is an organization meet requires of its environmental components that continuity of organization survival requires to their supports. The Stakeholders analyze is important because it can be have an effective and influential role in the strategic management process of organization. The research problem is the major benefits conflict of the banks strategic stakeholders. The aim of this study is application and its method is descriptive -analytic. The statistical community for the Strategic stakeholders' research is Bank Sarmayeh Iran
How Do Experts Think? An Investigation of the Barriers to Internationalisation of SMEs in Iran
No full textNowadays, “internationalisation” is a topic of concern for many types of research on small and medium-sized enterprises (SMEs). SMEs pursue internationalization policy as a leading process to keep and improve their position in the competitive business markets. However, SMEs face many challenges that hinder the successful implementation of the internationalization process. This chapter aims to recognise the important barriers to internationalisation for Iranian SMEs. We conduct two studies using a combined exploratory and confirmatory approach. We apply the Delphi method for exploring and forecasting the key barriers in the first study. In the second study, we validate the key indicator employing a Structural Equation Modelling technique for the Confirmatory Factor Analysis of the survey data. In the Delphi method, a group of 24 managers and academic professors in Iran, identified the main barriers. A sample of 210 survey observations was collected from the owner and top managers, senior managers, and employees. The results suggest 8 key factors and 31 indicators of barriers to internationalisation associated with Iranian SMEs: informational, financial, marketing, functional, procedural, governmental, environmental and, tariff and non-tariff. This research contributes to the knowledge of critical obstacles concern for current and future business internationalisation, and the outcomes provide practical implications. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2021
Proformaekteskap og familieinnvandring : En analyse av gjeldende regelverk mot proformaekteskap ved familieinnvandring
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