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Articles 151 - 180 of 2868
Full-Text Articles in Engineering
Global Sensitivity Analysis Applied To Model Inversion Problems: A Contribution To Rail Condition Monitoring, René Schenkendorf, Jörn Groos
Global Sensitivity Analysis Applied To Model Inversion Problems: A Contribution To Rail Condition Monitoring, René Schenkendorf, Jörn Groos
René Schenkendorf
Rising demands on railroad infrastructure operator by means of profitability and punctuality call for advanced concepts of Prognostics and Health Management. Condition based preventive maintenance aims at strengthening the rail mode of transport through an optimized scheduling of maintenance actions based on the actual and prognosticated infrastructure condition, respectively. When applying model-based algorithms within the framework of Prognostics and Health Management unknown model parameters have to be identified first. Which of these parameters should be known as precisely as possible can be figured out systematically by a sensitivity analysis. A comprehensive global sensitivity analysis, however, might be prohibitive by means …
48 - بررسي تاثير ديوار ترومب بر آسايش حرارتي افراد در اقليم تهران توسط نرم افزار انرژي پلاس, Alireza Zolfaghari, Hamed Mosleshi, Mehran Sa'adati-Nasab
48 - بررسي تاثير ديوار ترومب بر آسايش حرارتي افراد در اقليم تهران توسط نرم افزار انرژي پلاس, Alireza Zolfaghari, Hamed Mosleshi, Mehran Sa'adati-Nasab
Dr Alireza Zolfaghari
No abstract provided.
Impact Responses Of Prestressing Tendons In Railway Concrete Sleepers In High Speed Rail Environments, Sakdirat Kaewunruen, Alex M. Remennikov
Impact Responses Of Prestressing Tendons In Railway Concrete Sleepers In High Speed Rail Environments, Sakdirat Kaewunruen, Alex M. Remennikov
Sakdirat Kaewunruen
Prestressed concrete sleepers (or railroad ties) are designed in order to carry and transfer the wheel loads from the rails to the ground and are installed as the crosstie beam support in railway track systems. They are subjected to impact loading conditions that are resulted from train operations over wheel or rail abnormalities, such as flat wheels, dipped rails, crossing transfers, rail squats, corrugation, etc. The magnitude of the shock load relies on various factors such as axle load, types of wheel/rail imperfections, speeds of vehicle, track stiffness, etc. This paper demonstrates the development of finite element modelling to evaluate …
Significantly Improved Photocurrent Response Of Zns-Reduced Graphene Oxide Composites
Significantly Improved Photocurrent Response Of Zns-Reduced Graphene Oxide Composites
Faculty of Engineering University of Malaya
ZnS-nanoparticles (NPs) reduced graphene oxide (rGO) composites with a high degree of crystallinity and high dispersity were successfully synthesized via a facile solvothermal method in the gelatin medium, during which the formation of ZnS NPs, reduction of graphene oxide and loading of ZnS NPs into the rGO surface occur simultaneously. Gelatin, as a natural capping agent, plays a significant role in controlling the degree of dispersion and coverage of ZnS NPs. The effect of rGO on the crystalline structure and optical properties of ZnS NPs were determined via X-ray diffraction, UV-visible diffused reflectance spectroscopy and photoluminescence spectroscopy. The ZnS-rGO composites …
47 - برآورد ميزان تأثيرگذاري دماي ذوب مواد تغيير فاز دهنده بكار رفته در جدار جنوبي ساختمان بر مصرف انرژي سالانه در شرايط اقليمي تهران, Alireza Zolfaghari, Mohammad Solhi, Peyman Ebrahimi-Naghani
47 - برآورد ميزان تأثيرگذاري دماي ذوب مواد تغيير فاز دهنده بكار رفته در جدار جنوبي ساختمان بر مصرف انرژي سالانه در شرايط اقليمي تهران, Alireza Zolfaghari, Mohammad Solhi, Peyman Ebrahimi-Naghani
Dr Alireza Zolfaghari
No abstract provided.
Wpływ Instalacji Termicznego Przekształcania Odpadów Komunalnych Na Jakość Powietrza, Robert Oleniacz
Wpływ Instalacji Termicznego Przekształcania Odpadów Komunalnych Na Jakość Powietrza, Robert Oleniacz
Robert Oleniacz
At the turn of 2015/2016 it is planned to launch in Poland a few new municipal solid waste incineration plants. This type activities causes usually concerns of the local community due to their potential negative impact on air quality. Are these fears are, however, justified? The article describes allowable air emissions for new waste incinerators, the actual emissions that occur from such installations, and the current state of knowledge about their impact on air pollution.English title: The impact of installations of municipal solid waste thermal treatment on air quality.
46 - بررسي ميداني اثرات استفاده از سيستم هاي سرمايش انفرادي در محيط خواب بر شرايط آسايش حرارتي افراد و درصد نارضايتي ناشي از كوران, Alireza Zolfaghari, Mohammad Hooshmand, Ali Foad
46 - بررسي ميداني اثرات استفاده از سيستم هاي سرمايش انفرادي در محيط خواب بر شرايط آسايش حرارتي افراد و درصد نارضايتي ناشي از كوران, Alireza Zolfaghari, Mohammad Hooshmand, Ali Foad
Dr Alireza Zolfaghari
No abstract provided.
45 - بررسي ميداني اثرات استفاده از سيستم هاي سرمايش انفرادي بر شرايط آسايش حرارتي افراد و درصد نارضايتي ناشي از كوران, Alireza Zolfaghari, Ali Foad, Mohammad Hooshmand
45 - بررسي ميداني اثرات استفاده از سيستم هاي سرمايش انفرادي بر شرايط آسايش حرارتي افراد و درصد نارضايتي ناشي از كوران, Alireza Zolfaghari, Ali Foad, Mohammad Hooshmand
Dr Alireza Zolfaghari
No abstract provided.
دینامیک سیستم های قدرت - فصل سوم - قسمت سوم, Hadi Zayandehroodi
دینامیک سیستم های قدرت - فصل سوم - قسمت سوم, Hadi Zayandehroodi
Dr. Hadi Zayandehroodi
No abstract provided.
Mechanical Properties Of Intermetallic Compounds In Electrodeposited Multilayered Thin Film At Small Scale By Nanoindentation
Faculty of Engineering University of Malaya
Mechanical properties of intermetallic compounds (IMCs) which were formed in electrodeposited Cu/Sn and Cu/Ni/Sn multilayered thin film have been investigated. The layers of Cu, Sn and Ni were formed by electrodeposition technique using copper pyrophosphate, tin methanesulfonic and nickel Watts baths, respectively. After synthesis, samples were subjected to high temperature aging at 150 degrees C for 168 h. Two different types of intermetallics Cu3Sn and Cu6Sn5 were formed in Cu/Sn. After adding ultra-thin layer of Ni (70 nm) in between Cu and Sn layers, (Cu, Ni)(6)Sn-5 was formed after aging at similar condition to that of Cu/Sn. Tin whisker growth …
Biosensing Enhancement Of Dengue Virus Using Microballoon Mixers On Centrifugal Microfluidic Platforms
Faculty of Engineering University of Malaya
Dengue is the current leading cause of death among children in several Latin American and Asian countries. Due to poverty in areas where the disease is prevalent and the high cost of conventional diagnostic systems, low cost devices are needed to reduce the burden caused by dengue infection. Centrifugal microfluidic platforms are an alternative solution to reduce costs and increase the availability of a rapid diagnostic system. The rate of chemical reactions in such devices often depends on the efficiency of the mixing techniques employed in their microfluidic networks. This paper introduces a micromixer that operates by the expansion and …
44 - ارزيابي تاثير پوشش گياهي بام سبز بر صرفه جويي انرژي ساختمان در دو اقليم تهران و تبريز, Alireza Zolfaghari, Mohsen Talebi, Seyed Mehdi Ghaderi
44 - ارزيابي تاثير پوشش گياهي بام سبز بر صرفه جويي انرژي ساختمان در دو اقليم تهران و تبريز, Alireza Zolfaghari, Mohsen Talebi, Seyed Mehdi Ghaderi
Dr Alireza Zolfaghari
No abstract provided.
Game Theory In Transport & Logistic World, Sajjad Khaksari
Game Theory In Transport & Logistic World, Sajjad Khaksari
SAJJAD KHAKSARI
"OV & DP and BRT" some assumptions and a Case Study for studying John Nash "Game Theory" method in logistics and transportation world and that is only a briefly attempt to get familiar with the idea. A thought which asks "Is it possible to model and analyze one of the authenticity of the transport or logistics service request with respect to the Game Theory optimization idea?
Evaluating The Optical Properties Of Tio2 Nanofluid For A Direct Absorption Solar Collector
Evaluating The Optical Properties Of Tio2 Nanofluid For A Direct Absorption Solar Collector
Faculty of Engineering University of Malaya
Recent studies specify that designated nanofluids may increase the proficiency of direct absorption solar thermal collectors. To determine the efficiency of nanofluids in solar applications, their capability to change light energy to thermal energy must be identified (i.e., the absorption spectrum of the solar material). In view of that, this study compares model predictions to spectroscopic measurements of extinction coefficients over wavelengths that are important for solar energy (200- 1100nm). In the first decade of nanofluid research, most of the focus was on measuring and modeling the fundamental thermophysical properties of nanofluids (i.e., thermal conductivity, density, viscosity, and convection coefficients). …
Experimental And Numerical Investigation Of Heat Transfer In Cnt Nanofluids
Experimental And Numerical Investigation Of Heat Transfer In Cnt Nanofluids
Faculty of Engineering University of Malaya
Nanofluids with their enhanced thermal conductivity are believed to be a promising coolant in heat transfer applications. In this study, carbon nanotube (CNT) nanofluids of 0.01wt%, stabilised by 1.0wt% gum arabic were used as a cooling liquid in a concentric tube laminar flow heat exchanger. The flow rate of cold fluid varied from 10 to 50g/s. Both experimental and numerical simulations were carried out to determine the heat transfer enhancement using CNT nanofluids. Computational fluid dynamics (CFD) simulations were carried out using Fluent v 6.3 by assuming single-phase approximation. Thermal conductivity, density and rheology of the nanofluid were also measured …
Love Is A Two Way Street, William W. Riggs, John Gilderbloom
Love Is A Two Way Street, William W. Riggs, John Gilderbloom
William W. Riggs
A half a century ago, we were in love with our streets. They were also living things. They were the open-air living room of our society, the conduct for neighborhood play and discussion, the glue of our social fabric. One of the key urban theorists of the 20th century, Jane Jacobs wrote in Fortune Magazine that the street “…works harder than any other part of downtown. It is the nervous system; it communicates the flavor, the feel, the sights. It is the major point of transaction and communication. Users of downtown know very well that downtown needs not fewer streets, …
43 - تحليل تاثيرات استفاده از سيستمهاي نوين سرمايشي انفرادي بر شرايط آسايش حرارتي افراد, Alireza Zolfaghari, Mohamad Zabihi, Saeed Dadgar Bajestan, Omid Deymi
43 - تحليل تاثيرات استفاده از سيستمهاي نوين سرمايشي انفرادي بر شرايط آسايش حرارتي افراد, Alireza Zolfaghari, Mohamad Zabihi, Saeed Dadgar Bajestan, Omid Deymi
Dr Alireza Zolfaghari
No abstract provided.
Investigating Cavitation Peening Parameters For Fatigue Performance Using Designed Experiment, Mohammadsadegh Mobin, Afshan Roshani, Mahmood Mobin, Ali Rastegari
Investigating Cavitation Peening Parameters For Fatigue Performance Using Designed Experiment, Mohammadsadegh Mobin, Afshan Roshani, Mahmood Mobin, Ali Rastegari
Mohammadsadegh Mobin
Mechanical surface enhancement techniques such as cavitation peening (CP) have various design parameters which can affect the fatigue performance of the part. In this study, a full factorial design of experiment is applied to investigate the effects of cavitation peening process parameters on the fatigue performance of carburized steel. These parameters include standoff distance, cavitation number, nozzle size, and exposure time. The response variables considered in this experiment include residual stress, surface roughness and austenitic ratio. Results obtained from full factorial design of experiment method were compared with the results from literature which applied Taguchi method. The comparison revealed that …
Aviation Technical Publication Content Management System Selection Using Integrated Fuzzy-Grey Mcdm Method, Ashley Skeete, Mohammadsadegh Mobin
Aviation Technical Publication Content Management System Selection Using Integrated Fuzzy-Grey Mcdm Method, Ashley Skeete, Mohammadsadegh Mobin
Mohammadsadegh Mobin
The development of commercial maintenance and overhaul manuals for aerospace engines is requisite for certification by the Federal Aviation Administration (FAA). Robust content management systems are used for authoring, publishing, and maintaining these manuals which must meet general industry standards as well as unique company requirements. Therefore, system selection is complex, requiring review of numerous criteria of both quantitative and qualitative nature and is highly dependent on expert judgment which includes uncertainty. In this paper, a major aerospace company was used as a case study for an integrated Fuzzy-Grey Multi-Criteria Decision Making (MCDM) methodology for the selection of a technical …
Performance Evaluation Of Tehran-Qom Highway Emergency Medical Service System Using Hypercube Queuing Model, Mohammadsadegh Mobin, Zhaojun Li, Maghsoud Amiri
Performance Evaluation Of Tehran-Qom Highway Emergency Medical Service System Using Hypercube Queuing Model, Mohammadsadegh Mobin, Zhaojun Li, Maghsoud Amiri
Mohammadsadegh Mobin
This paper studies the ambulance deployment of the Tehran-Qom highway emergency medical service (EMS) system. The response time of EMS to an emergency call can have impact on the users in terms of the life and death, and this performance metric is evaluated using the proposed hypercube queuing model. The model is based on spatially distributed queuing theory and Markovian analysis approximations, and it is one of the most effective approaches for analyzing emergency response systems. In this research, performance measures of the EMS including workloads and mean response times are evaluated using the hypercube model. Modification to the existing …
Topsis As A Method To Populate Risk Matrix Axes, Christian Salmon, Mohammadsadegh Mobin, Afshan Roshani
Topsis As A Method To Populate Risk Matrix Axes, Christian Salmon, Mohammadsadegh Mobin, Afshan Roshani
Mohammadsadegh Mobin
This research utilizes TOPSIS (a Multi-Criteria ranking methodology) to populate the axes of a risk matrix when modeling risk exposure onboard commercial fishing vessels with the intent to identify mitigating interventions in low risk settings for possible transfer to high risk settings. The specific hazard of interest is the release of refrigerants into confined spaces onboard commercial fishing vessels. The metrics of risk are: 1) expectation that refrigerants are released onboard vessels, and 2) consequence of releases that have occurred. To model expectation: data were collected on the United States’ commercial fisheries, including location and number of participating vessels. These …
Multi-Objective X-Bar Control Chart Design By Integrating Nsga-Ii And Data Envelopment Analysis, Mohammadsadegh Mobin, Zhaojun Li, Mahdi Massahi Khoraskani
Multi-Objective X-Bar Control Chart Design By Integrating Nsga-Ii And Data Envelopment Analysis, Mohammadsadegh Mobin, Zhaojun Li, Mahdi Massahi Khoraskani
Mohammadsadegh Mobin
Control charts are widely used in industry to establish and maintain statistical control of a process for quality improvement. Economic use of a control chart calls for designing the optimal parameters for sample size, sampling frequency, and the control limits for the chart. This paper investigates the X-bar control chart design through a two-stage multi-objective optimization process. The multi-objective formulation reflects the multiple objective needs in designing an X-bar control chart. For example, these objectives may include average run length when in statistical control, the type-I error, and the detection power. The optimization process first searches the Pareto Frontiers using …
Comparision Of Perturb And Observer And Incremental Conductance Mppt Based Solar Tracking System, Innovative Research Publications Irp India, Nilam Rajendra Deshmukh
Comparision Of Perturb And Observer And Incremental Conductance Mppt Based Solar Tracking System, Innovative Research Publications Irp India, Nilam Rajendra Deshmukh
Innovative Research Publications IRP India
This paper presents a detailed analysis of the two most well-known hill-climbing maximum power point tracking (MPPT) algorithms: the perturb-and-observe (P&O) and incremental conductance (INC). The purpose of the analysis is to clarify some common misconceptions in the literature regarding these two trackers, therefore helping the selection process of MPPT
Guaranteeing Data Storage Security In Cloud Computing, Innovative Research Publications Irp India, Viswanath Aiyer, Rohit Bhutkar, Sagar Anvekar, Dinesh Chavan
Guaranteeing Data Storage Security In Cloud Computing, Innovative Research Publications Irp India, Viswanath Aiyer, Rohit Bhutkar, Sagar Anvekar, Dinesh Chavan
Innovative Research Publications IRP India
Cloud Computing has been imagined as the next generation structural engineering of IT Enterprise. .By using the homomorphic token with dispersed verification of eradication coded information, our plan attains to the combination of capacity rightness protection and information blunder limitation, i.e., the identification of getting rowdy server(s)
The Mechanical Properties Of Ukam Fibre-Reinforced Cashew Nut Shell Resin Composite, Innovative Research Publications Irp India, Ibe Godwin Anwara, Dumpe Koba Barinem
The Mechanical Properties Of Ukam Fibre-Reinforced Cashew Nut Shell Resin Composite, Innovative Research Publications Irp India, Ibe Godwin Anwara, Dumpe Koba Barinem
Innovative Research Publications IRP India
The mechanical properties of ukam fibre cashew nut shell resin composite were studied for possible structural application in engineering. Basically, the hand lay-up method was employed to manufacture the test samples of the composite by 40:60 weight ratio and testing the samples’ mechanical properties using the instron tensile machine and the izod impact machine respectively. Consequently, the experiments demonstrated that the ukam fibre reinforced cashew nut shell resin composite has a maximum tensile strength of 40.5MPa, the impact energy of 1.93J and a young tensile modulus of 1GPa. The above results indicate that ukam fibre- reinforced cashew nut shell resin …
Rural Water Sector Policies And Reform – A Review, Innovative Research Publications Irp India, Astha Kumari, Mukul Kulshrestha
Rural Water Sector Policies And Reform – A Review, Innovative Research Publications Irp India, Astha Kumari, Mukul Kulshrestha
Innovative Research Publications IRP India
This paper is an attempt to describe the major components of drinking water in rural sector and its tariff design. With an integrated approach towards improving Quality of Life (QoL) of rural people, ensuring equity and effective public participation as willingness to pay for water. The pressure of rural development programme has been made a frontal attack on poverty through pricing of drinking water. Therefore, water tariffs should be fixed to make people understand the value of water. Present paper describes various works done till date in this field of research
Characteristics Of Flow Meters With Sediment Laden Flow – A Review, Innovative Research Publications Irp India, Abhishek Kala, S.K Mittal, M.K. Choudhary
Characteristics Of Flow Meters With Sediment Laden Flow – A Review, Innovative Research Publications Irp India, Abhishek Kala, S.K Mittal, M.K. Choudhary
Innovative Research Publications IRP India
Measurement of flow is an important aspect in the field of hydraulic engineering, both in case of open channel as well as pipe or conduits. In case of pipe conduits various flow meters are used for flow estimation; out of which venturimeter and orifice meter are most commonly used and conventional means. Pipes or conduit carrying sediment laden flow or slurry-water mixture is very common in most of the industries, sewage carrying system etc. Suitability of flow meters i.e. venturimeter and flow meter need to be analyzed for sediment laden flow. Due to the presence of slurry or sediments, coefficient …
Indoor Positioning System Using Bluetooth, Innovative Research Publications Irp India, Sahil Puri
Indoor Positioning System Using Bluetooth, Innovative Research Publications Irp India, Sahil Puri
Innovative Research Publications IRP India
This Paper on Bluetooth Indoor Positioning System is the intersection of Bluetooth Technology and Indoor Positioning Systems. Almost every smartphone today is Bluetooth enabled, making the use of the technology more flexible. We aim at using the RSSI value of Bluetooth signals to track the location of a device
Using Data Envelopment Analysis To Evaluate Technical Training Program For Maintenance Units, Innovative Research Publications Irp India, Nai-Chieh Wei, Tzu-Jou Liao, Chiung-Fen Chang And Shui-Cheung Cham
Using Data Envelopment Analysis To Evaluate Technical Training Program For Maintenance Units, Innovative Research Publications Irp India, Nai-Chieh Wei, Tzu-Jou Liao, Chiung-Fen Chang And Shui-Cheung Cham
Innovative Research Publications IRP India
Applying data envelope analysis (DEA), this study focuses on the influences of objectivity and subjectivity on aircraft maintenance supervision evaluation and inspection procedure; the aim is to improve overall logistic operation and training efficiency. Moreover, the results of this analysis will be helpful for making decisions in training, management, capability and competitiveness
Joints Properties Of One Side Welded Of Ship Materials With Variation Of Angle Groove, Innovative Research Publications Irp India, Yustiasih Purwaningrum, Triyono No, Tri Syarifuddin, Isharyadi Di
Joints Properties Of One Side Welded Of Ship Materials With Variation Of Angle Groove, Innovative Research Publications Irp India, Yustiasih Purwaningrum, Triyono No, Tri Syarifuddin, Isharyadi Di
Innovative Research Publications IRP India
Indonesian National Transportation Safety Commission based on data from the period 2003-2008 and The Study for the Maritime Traffic Safety System Development Plan states that 21% of the cause of the accident was the failure of Indonesian ship in the structure of the ship (hull structure). This study aimed to investigate the effect of variations in the angle groove of one side welding. Material used is low carbon steel LR grade A in a thickness 12 mm were welded using GMAW (Gas Metal Arc Welding) with a angle groove 20°, 40° and 60°. The physical properties examined with an optical …