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127483 full-text articles. Page 3468 of 3472.

Predicting Bite Force In Mammals: Two-Dimensional Versus Three-Dimensional Lever Models, JL Davis, SE Santana, ER Dumont, IR Grosse 2009 University of Massachusetts - Amherst

Predicting Bite Force In Mammals: Two-Dimensional Versus Three-Dimensional Lever Models, Jl Davis, Se Santana, Er Dumont, Ir Grosse

Jeffrey M. Davis

Bite force is a measure of whole-organism performance that is often used to investigate the relationships between performance, morphology and fitness. When in vivo measurements of bite force are unavailable, researchers often turn to lever models to predict bite forces. This study demonstrates that bite force predictions based on two-dimensional (2-D) lever models can be improved by including three-dimensional (3-D) geometry and realistic physiological cross-sectional areas derived from dissections. Widely used, the 2-D method does a reasonable job of predicting bite force. However, it does so by over predicting physiological cross-sectional areas for the masseter and pterygoid muscles and under ...


The Optimization Of The Threshold For The Preventive Maintenance Actions In A Condition-Based Maintenance Program Via Dynamic Programming Approach, Kamran Shahanaghi, Mehdi Jafarian, Majid Beikverdi, Zeinab NezhadBiglari 2009 Industrial Engineering Department, University of Science and Culture

The Optimization Of The Threshold For The Preventive Maintenance Actions In A Condition-Based Maintenance Program Via Dynamic Programming Approach, Kamran Shahanaghi, Mehdi Jafarian, Majid Beikverdi, Zeinab Nezhadbiglari

Mehdi Jafarian

The last step of a condition based maintenance (CBM) program is maintenance decision-making. This step is the most important and the most critical stage of maintenance for executive personnel and management whom work on taking maintenance actions. This decision making would be done according to certain criteria such as risk, cost, reliability and availability. This paper considered a dynamic programming model to optimization of the threshold for the preventive maintenance actions in a condition-based maintenance program. The basis of this modeling is the average cost of maintenance actions, failures and exchanges. In this paper, we improved the memory of the ...


Effects Of Variable Density For Film Evaporation On Laminar Mixed Convection In A Vertical Channel, Abdelfettah Bannari, Nicolas Galanis 2009 Sherbrooke University

Effects Of Variable Density For Film Evaporation On Laminar Mixed Convection In A Vertical Channel, Abdelfettah Bannari, Nicolas Galanis

Abdelfettah Bannari Ph.D

No abstract provided.


Oscillatory And Monotonic Modes Of Long-Wave Marangoni Convection In A Thin Film, Sergey Shklyaev, Mikhail Khenner, Alexei Alabuzhev 2009 Western Kentucky University

Oscillatory And Monotonic Modes Of Long-Wave Marangoni Convection In A Thin Film, Sergey Shklyaev, Mikhail Khenner, Alexei Alabuzhev

Mikhail Khenner

We study long-wave Marangoni convection in a layer heated from below. Using the scaling k=O#1;#3;Bi#2;, where k is the wave number and Bi is the Biot number, we derive a set of amplitude equations. Analysis of this set shows presence of monotonic and oscillatory modes of instability. Oscillatory mode has not been previously found for such direction of heating. Studies of weakly nonlinear dynamics demonstrate that stable steady and oscillatory patterns can be found near the stability threshold.


Ironless Transducer For Measuring The Mechanical Properties Of Porous Materials, Olivier Doutres, Nicolas Dauchez, Jean-Michel Génevaux, Guy Lemarquand, Sylvain Mezil 2009 École de technologie supérieure (ETS)

Ironless Transducer For Measuring The Mechanical Properties Of Porous Materials, Olivier Doutres, Nicolas Dauchez, Jean-Michel Génevaux, Guy Lemarquand, Sylvain Mezil

Olivier Doutres Ph.D.

This paper presents a measurement setup for determining the mechanical properties of porous materials at low and medium frequencies by extending toward higher frequencies the quasistatic method based on a compression test. Indeed, classical quasistatic methods generally neglect the inertia effect of the porous sample and the coupling between the surrounding fluid and the frame; they are restricted to low frequency range (<100 Hz) or specific sample shape. In the present method, the porous sample is placed in a cavity to avoid a lateral airflow. Then a specific electrodynamic ironless transducer is used to compress the sample. This highly linear ...


Mobimaths: An Approach To Utilising Smartphones In Teaching Mathematics, Brendan Tangney, Stefan Weber, David Knowles, Jenny Munnelly, Ronan Watson, As'ad Salkham, Kevin Jennings 2009 Dublin Institute of Technology

Mobimaths: An Approach To Utilising Smartphones In Teaching Mathematics, Brendan Tangney, Stefan Weber, David Knowles, Jenny Munnelly, Ronan Watson, As'ad Salkham, Kevin Jennings

Jenny Munnelly

The teaching of mathematics at second level is well known to be a challenging issue. An overemphasis on didactic teaching, lack of encouragement to explore possible alternative solutions to problems, an overemphasis on procedure and the separation of mathematical procedures from real world problems are just some of the factors which are put forward as contributing to the difficulties in math education. Through its inherent ability to support collaboration, and contextualised learning, mobile technology offers the potential to address at least some of the issues in mathematics education. This paper describes the approach we are following to create a set ...


Application Of Electromagnetic Waves As A Solution To Some Agricultural Problems, Prof Mahmoud Moghavvemi, I.I.Bt Muhamad, M.A. Soltani, A. Enayati, H. Aliakbarian, H. Ameri 2009 University of Malaya

Application Of Electromagnetic Waves As A Solution To Some Agricultural Problems, Prof Mahmoud Moghavvemi, I.I.Bt Muhamad, M.A. Soltani, A. Enayati, H. Aliakbarian, H. Ameri

Professor Mahmoud Moghavvemi

No abstract provided.


Oil Prices, Stock Markets And Portfolio Investment: Evidence From Sector Analysis In Europe Over The Last Decade, Mohamed Arouri, Duc Khuong Nguyen 2009 Selected Works

Oil Prices, Stock Markets And Portfolio Investment: Evidence From Sector Analysis In Europe Over The Last Decade, Mohamed Arouri, Duc Khuong Nguyen

Duc Khuong Nguyen

This article extends the understanding of oil–stock market relationships over the last turbulent decade. Unlike previous empirical investigations, which have largely focused on broad-based market indices (national and/or regional indices), we examine short-term linkages in the aggregate as well as sector by sector levels in Europe using different econometric techniques. Our main findings suggest that the reactions of stock returns to oil price changes differ greatly depending on the activity sector. In the out-of-sample analysis we show that introducing oil asset into a diversified portfolio of stocks allows to significantly improve its risk-return characteristics.


Time-Varying Predictability In Crude Oil Markets: The Case Of Gcc Countries, Mohamed Arouri, Thanh Huong Dinh, Duc Khuong Nguyen 2009 Selected Works

Time-Varying Predictability In Crude Oil Markets: The Case Of Gcc Countries, Mohamed Arouri, Thanh Huong Dinh, Duc Khuong Nguyen

Duc Khuong Nguyen

This paper uses a time-varying parameter model with generalized autoregressive conditional heteroscedasticity effects to examine the dynamic behavior of crude-oil prices for the period February 7, 1997–January 8, 2010. Using data from four countries of the Gulf Cooperation Council, we find evidence of short-term predictability in oil-price changes over time, except for several short sub-periods. However, the hypothesis of convergence towards weak-form informational efficiency is rejected for all markets. In addition, we explore the possibility of structural breaks in the time-paths of the estimated predictability indices and detect only one breakpoint, for the oil markets in Qatar and the ...


Improving The Properties Of The Tire Tread By.Pdf, J Oleiwi 2009 University of Technology - Iraq

Improving The Properties Of The Tire Tread By.Pdf, J Oleiwi

Jawad K. Oleiwi

Particulate reinforced elastomer composite was prepared by adding reinforcing
fillers Al2O3 and SiO2 separately to the styrene butadiene rubber (SBR), at
different loading levels (0, 5, 10, 15, 20 and 25 pphr). Also many specific tests
are performed on these composites. The effects of fillers type and their loading
level on the mechanical and physical properties were studied.
The results showed that the mechanical properties except resilience
increased with the addition of both types of reinforcing fillers and with the
increase of the loading level of them. Silica fillers increased these properties
more than alumina fillers. The largest value of ...


Upper Bounds On The Number Of Channels To Ensure Collision-Free Communications In Multi-Channel Wireless Networks Using Directional Antennas, Hong-Ning Dai, Kam-Wing Ng, Min-You Wu 2009 Macau University of Science and Technology

Upper Bounds On The Number Of Channels To Ensure Collision-Free Communications In Multi-Channel Wireless Networks Using Directional Antennas, Hong-Ning Dai, Kam-Wing Ng, Min-You Wu

Hong-Ning Dai

Recent studies have found that using multiple channels can separate concurrent transmissions and significantly improve network throughput. However, these studies have only considered wireless nodes that are equipped with omni-directional antennas, which have high interference. On the other hand, other researchers have found that using directional antennas in wireless networks can reduce interference and improve the network performance. But their studies have only considered single channel to be used in wireless networks with directional antennas. Thus, integrating the two technologies of multiple channels and directional antennas together can potentially bring more benefits. Some previous works have studies the capacity on ...


Pricing Residential Water To Account For Scarcity In Cyprus, Theodoros Zachariadis 2009 Cyprus University of Technology

Pricing Residential Water To Account For Scarcity In Cyprus, Theodoros Zachariadis

Theodoros Zachariadis

No abstract provided.


Fractionation And Characterization Of Oil Palm (Elaeis Guineensis) As Treated By Supercritical Water, Mahendra Varman Munusamy M.Varman, H. Miyafuji, S. Saka 2009 University of Malaya

Fractionation And Characterization Of Oil Palm (Elaeis Guineensis) As Treated By Supercritical Water, Mahendra Varman Munusamy M.Varman, H. Miyafuji, S. Saka

Mahendra Varman Munusamy (M. Varman)

In order to investigate the potential for efficient utilization of oil palm (Elaeis guineensis), supercritical water treatment (at 380°C and 100 MPa for 8 s) was applied to fractionate extractives-free samples into water-soluble portion and water-insoluble portion. The water-insoluble portion was further fractionated into methanol-soluble portion and methanol-insoluble residue. Samples were prepared from various parts of oil palm, i.e., trunks, fronds, mesocarp fibers, shells, empty fruit bunches, and kernel cake. These fractionated products were then characterized analytically. The water-soluble and methanol-soluble portions were determined to be mainly composed of carbohydrate-derived products and lignin-derived products, respectively. The methanol-insoluble residue ...


Effect Of Spontaneous Gas Expansion And Mobilization On The Aqueous-Phase Concentrations Above A Dense Non-Aqueous Phase Liquid Pool., Kevin G. Mumford, James Smith, Sarah E. Dickson 2009 Queen's University - Kingston, Ontario

Effect Of Spontaneous Gas Expansion And Mobilization On The Aqueous-Phase Concentrations Above A Dense Non-Aqueous Phase Liquid Pool., Kevin G. Mumford, James Smith, Sarah E. Dickson

Sarah E Dickson

This paper presents a framework to quantify the overall variability of the model estimations of Total Polychlorinated Biphenyls (Total PCBs) concentrations in the Niagara River on the basis of the uncertainty of few model parameters and the natural variability embedded in some of the model input variables. The results of the uncertainty analysis are used to understand the importance of stochastic model components and their effect on the overall reliability of the model output and to evaluate multiple sources of uncertainty that might need to be further studied. The uncertainty analysis is performed using a newly developed point estimate method ...


Controlled Language - Does My Company Need It?, Uwe Muegge 2009 Selected Works

Controlled Language - Does My Company Need It?, Uwe Muegge

Uwe Muegge

A controlled language is a natural language, as opposed to an artificial or constructed language. Natural languages such as English or German are languages that are used by humans for general communication. A controlled language differs from the general language in two significant ways: 1. The grammar rules of a controlled language are typically more restrictive than those of the general language. 2. The vocabulary of a controlled language typically contains only a fraction of the words that are permissible in the general language.


Investigations On Tio2 And Ag Based Single And Multilayer Films For Window Glazings, 2009 Selected Works

Investigations On Tio2 And Ag Based Single And Multilayer Films For Window Glazings

A.S. Md Abdul Haseeb

In this investigation, TiO2 and Ag based single and multilayer-films were deposited on microscope glass slides with varying individual layer thicknesses by radio-frequency reactive magnetron sputtering. Prior to multilayer development, single layers of Ag and TiO2 were deposited and characterized. All the films were prepared at an elevated pressure of 3 Pa at room temperature. It was found that single layer of TiO2 showed anatase polycrystalline structure. It also exhibited high visible transmittance of above 80% and higher refractive index of 2.31 at a wavelength of 550 nm. The indirect optical band gap of the TiO2 films was estimated ...


A Simple Method For Thesestimation Of Thermal Insulation Thickness, ali ali 2009 Selected Works

A Simple Method For Thesestimation Of Thermal Insulation Thickness, Ali Ali

ali ali

No abstract provided.


Carbon Accounting Initiatives: Case Study Of A Petroleum Refinery In Malaysia To Prepare For Future Carbon Market, Abdul Aziz Abdul Raman 2009 University of Malaya

Carbon Accounting Initiatives: Case Study Of A Petroleum Refinery In Malaysia To Prepare For Future Carbon Market, Abdul Aziz Abdul Raman

Abdul Aziz Abdul Raman

Petroleum refining process produces a large amount of atmospheric pollutants including greenhouse gases which are attributed to global warming. The international community inevitably addressed the global warming issue by introducing a market-based mechanism known as Emission Trading Systems (ETS) under the Kyoto Protocol which imposes binding limits to developed nations using three flexibility mechanisms, including the Clean Development Mechanism (CDM). © School of Engineering, Taylor's University College.


Degradation Of Organic Pollutants In Domestic Wastewaters By Concrete Plates Containing Of Photocatalyst Nanoparticles, Masoud Rastegar 2009 Selected Works

Degradation Of Organic Pollutants In Domestic Wastewaters By Concrete Plates Containing Of Photocatalyst Nanoparticles, Masoud Rastegar

Masoud Rastegar

No abstract provided.


A Short Method For The Design Of Reactive Distillation Column, Marcelino Carrera-Rodriguez, Juan Gabriel Segovia-Hernandez, Adrian Bonilla-Petriciolet 2009 Universidad de Guanajuato

A Short Method For The Design Of Reactive Distillation Column, Marcelino Carrera-Rodriguez, Juan Gabriel Segovia-Hernandez, Adrian Bonilla-Petriciolet

Adrian Bonilla-Petriciolet

In this study, a short method for the design of reactive distillation is presented. The method is based on distillation lines and tray-by-tray calculations, and a new strategy is suggested to locate the reflux ratio, the number of stages, and feed tray. The material balances are solved from the outside (top and bottom) to the inside of the distillation column (feed), to ensure that the product compositions are met. To reduce the numerical difficulties, the method is based on the application of reaction-invariant composition variables. The synthesis of MTBE with the presence of inert is used as case of study ...


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