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Search Results: 1 - 10 of 718 matches for " Bassam Assaf "
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Measurement of the In-Plane Thermal Conductivity of Long Fiber Composites by Inverse Analysis  [PDF]
Bassam Assaf, Vincent Sobotka, Fran?ois Trochu
Open Journal of Composite Materials (OJCM) , 2017, DOI: 10.4236/ojcm.2017.72005
Abstract: In the present work, inverse thermal analysis of heat conduction is carried out to estimate the in-plane thermal conductivity of composites. Numerical simulations were performed to determine the optimal configuration of the heating system to ensure a unidirectional heat transfer in the composite sample. Composite plates made of unsaturated polyester resin and unidirectional glass fibers were fabricated by injection to validate the methodology. A heating and cooling cycle is applied at the bottom and top surfaces of the sample. The thermal conductivity can be deduced from transient temperature measurements given by thermocouples positioned at three chosen locations along the fibers direction. The inverse analysis algorithm is initiated by solving the direct problem defined by the one-dimensional transient heat conduction equation using a first estimate of thermal conductivity. The integral in time of the square distance between the measured and predicted values is the criterion minimized in the inverse analysis algorithm. Finally, the evolution of the in-plane composite thermal conductivity can be deduced from the experimental results by the rule of mixture.
Predictive Prefetching for Parallel Hybrid Storage Systems  [PDF]
Maen M. Al Assaf
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2015, DOI: 10.4236/ijcns.2015.85018
Abstract: In this paper, we present a predictive prefetching mechanism that is based on probability graph approach to perform prefetching between different levels in a parallel hybrid storage system. The fundamental concept of our approach is to invoke parallel hybrid storage system’s parallelism and prefetch data among multiple storage levels (e.g. solid state disks, and hard disk drives) in parallel with the application’s on-demand I/O reading requests. In this study, we show that a predictive prefetching across multiple storage levels is an efficient technique for placing near future needed data blocks in the uppermost levels near the application. Our PPHSS approach extends previous ideas of predictive prefetching in two ways: (1) our approach reduces applications’ execution elapsed time by keeping data blocks that are predicted to be accessed in the near future cached in the uppermost level; (2) we propose a parallel data fetching scheme in which multiple fetching mechanisms (i.e. predictive prefetching and application’s on-demand data requests) can work in parallel; where the first one fetches data blocks among the different levels of the hybrid storage systems (i.e. low-level (slow) to high-level (fast) storage devices) and the other one fetches the data from the storage system to the application. Our PPHSS strategy integrated with the predictive prefetching mechanism significantly reduces overall I/O access time in a hybrid storage system. Finally, we developed a simulator to evaluate the performance of the proposed predictive prefetching scheme in the context of hybrid storage systems. Our results show that our PPHSS can improve system performance by 4% across real-world I/O traces without the need of using large size caches.
Modification and Development of a Blow Molding Machine  [PDF]
Bassam A. Al-Helou
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.44025
Abstract: This study is based on the modification and development of a two-liter plastic container blow molding machine into a five-liter one provided with a translucent view stripe. This study considers some objectives including reducing the total cost, increasing the amount of plastic recovery, and raising the desired plastic materials. Proper designs were prepared and directly applied on spot. Tangible results were obtained. Among others, the modification of some components of the machine, e.g. the extruder, has led to the possible reuse of the milled (recovery) and extra material from the manufacturing processes. That was also conducive to an effective reduction in the cost of production to 50% in some cases. Prior to its modification, this old machine was used to produce polyvinyl chloride (PVC) containers that have become prohibited these days for their damaging effect on man’s life. For now, and after modification, it has become possible to use High Density Polyethylene (HDPE) material, a fact that has improved labor conditions, too.
Current Challenges of Organ Donation Programs in Syria
Bassam Saeed
International Journal of Organ Transplantation Medicine , 2010,
Abstract: Background: Renal transplantation is the optimal treatment for the majority of patients with end-stage renal disease.Objective: To examine the donor characteristics of kidney transplants in Syria and the impact of national Syrian legislation on the evolution of kidney transplantation activities in the private and public sectors.Methods: Available data on all kidney transplants performed in Syria over the last 2 decades was retrospectively analyzed to assess the characteristics of kidney donors and recipients with a focus upon transplants since 2003.Results: The kidney transplant rate has increased from 7 kidney transplants per million populations in 2002 to more than 17 in 2007. In the meantime, a substantial decline in the rate of kidney transplantation performed on Syrian nationals abroad was observed from 65% of all kidney transplantations in 1998 to less than 2% in 2007. Despite the prohibition to buy a kidney in Syria, vendors had found ways to sell their kidneys through disreputable brokers. Potential related donors were not inclined to donate kidneys to their relatives as long as kidneys could be bought from a non-related donor. By 2008, the percent of related donors in private sector represented only 8% of all donors, as compared to 50% in public hospitals. Consequently, in January 2008, the government of Syria issued a pronouncement restricting kidney transplantation to the public sector with a new national regulatory oversight of transplantation practices. Since this 2008 Administrative Order was promulgated, the kidney transplant rate in public hospitals has substantially increased by 55% with the establishmentof new public transplant centers in the 3 largest cities in Syria.Conclusion: The recommendations of the Istanbul Declaration and the Revised Guiding Principles of the World Health Organization have yet to be implemented in Syria but the expansion of kidney transplants in the public sector is an important initial step for initiating a deceased organ donation program as an essential component of a comprehensive approach to the problem of the organ shortage.
MESOT Fellowship Program
Bassam Saeed
International Journal of Organ Transplantation Medicine , 2011,
Abstract: MESOT Fellowship Program (MFP) is an initiative aimed at promoting and advancing organ transplantation in under-served areas of the Middle East by helping them to establish local transplantation programs or to improve an existing program. The fel lowship program gives a great opportunity to the young physicians and surgeons from this region willing to acquire some particular skills related to various aspects of organ transplantation and provides them with specific and hands-on training opportunities in host institutions. MESOT Fellows return home to share new skills and knowledge in medical and surgical transplantation and improve local standards. The proposal to establish MFP originated from Professor Nasser Simforoosh in Tehran. Later on, it was voted and approved during the general assembly of MESOT 2006 congress held in Kuwait. In fact, most of the credit goes to Professor Mustafa Mousawi from Kuwait who worked very hard to have it done and well established. The MESOT Council formed the MFP Commit tee and approved its training centers: Baskent in Ankara, Turkey; SIUT in Karachi, Pakistan; Labbafi Nezhad in Tehran, Iran; Shiraz Organ Transplant Center in Shiraz, Iran; Hamed El-Issa Organ Transplant Center in Kuwait, Kuwait; King Faisal Specialist Hospital and Research Cen ter in Riyadh, Saudi Arabia; and NUC in Mansoura, Egypt. The program was announced and well advertised. Some of the most eminent transplant surgeons and physicians from the Middle East region are heading the training process in the above-mentioned centers of excellence such as Professor Mehmet Haberal from Turkey, Professor Adib Rizvi and professor Anwar Naqvi from Pakistan, Professor Mustafa Mousawi from Kuwait, Professor Ali Malek-Hosseini and Professor Nasser Simforoosh from Iran, Professor Adel Bakr from Egypt and Professor Khalid El-Meshari from Saudi Arabia. The selection mechanism relies on five factors on the top of which is the availability of transplant activity of a given organ in the applicant center, city, and country and a written commitment by the applicant indicating his or her intent to return home upon completion of training to establish transplant unit at home center; in addition to affiliation of the applicant’s center, capability and suitability of the applicant’s center, academic position and age of the applicant. The application for MFP is online through MESOT Web site available at www.mesot-tx.org. The 30th of June of each year is the deadline to apply for MFP. The program was launched in January 2008. Yet 20 applicants from 10 Middle East countries have been
Requirements for optimal learning environment for an online project risk management game
Bassam Hussein
Journal of Project, Program & Portfolio Management , 2012,
Abstract: Several authors have questioned the effectiveness of using lecture-based teaching to provide students with enough confidence to apply project risk management. Gaming was proposed as a solution. However, despite widespread use of games in teaching project management, it is still not clear what conditions provide optimal learning through games. Another shortcoming with the existing games is oversimplification. This paper addresses these shortcomings and proposes a game design that captures real-life challenges associated with applying the project risk management process; a design that prompts an appreciation for project complexity as well as providing students with the opportunity to experience the consequences of ignoring or following the risk management process. The paper also identifies and elaborates on the requirements for optimum learning, and distinguishes between two types of requirements: 1) learning requirements, and 2) qualitative requirements. Learning requirements identify the learning outcomes of the game. These requirements were identified through structured and semi-structured interviews with senior project managers from several management-consulting firms. The challenges and the corresponding tactics that are adopted in practice in order to manage project risks were thus identified and ranked. These results are also presented in light of supporting literature. The challenges and associated tactics were mapped into a set of eight requirements representing the learning outcomes of the game. These requirements were then mapped to the design using four instructional methods: a briefing lecture, a team-based assignment, an online computer simulation, and a debriefing lecture. All these methods were linked by a real-life project case and executed in a gaming context to improve engagement. Qualitative requirements represent important conditions that must be present for optimal learning. These were identified through structured interviews with continuing education students taking a master's degree in project management. This empirical study resulted in four qualitative requirements that must be considered in the game design: 1) ownership, 2) relevance, 3) feedback, and 4) adaptation. The paper also presents the evaluation results of the game design. The purpose of the evaluation was to examine the game's ability to capture the two sets of requirements identified above.
Two remarks on the Shrinking Target Property
Bassam Fayad
Mathematics , 2005,
Abstract: We show that a translation of vector V on the torus has the monotone shrinking target property if and only if the vector V is of constant type. Then, using reparametrizations of linear flows, we show that there exist area preserving real analytic maps of the three torus that are mixing of all orders and do not enjoy the monotone shrinking target property.
Sharp well-posedness for Kadomtsev-Petviashvili-Burgers (KPBII) equation in $R^2$
Bassam Kojok
Mathematics , 2006,
Abstract: We prove global well-posedness for the Cauchy problem associated with the Kadomotsev-Petviashvili-Burgers equation (KPBII) in $\mathbb R^2$ when the initial value belongs to the anisotropic Sobolev space $H^{s_1,s_2}(\mathbb R^2)$ for all $s_1>-\frac12$ and $s_2\geq0$. On the other hand, we prove in some sense that our result is sharp.
Weighted restriction estimates using polynomial partitioning
Bassam Shayya
Mathematics , 2015,
Abstract: We use the polynomial partitioning method of Guth to prove weighted Fourier restriction estimates in $\Bbb R^3$ with exponents $p$ that range between $3$ and $3.25$, depending on the weight. We then use our restriction estimates to obtain new results on the decay of spherical means of Fourier transforms of positive compactly supported measures on $\Bbb R^3$ with finite $\alpha$-dimensional energies.
On the ergodicity of the Weyl sums cocycle
Bassam Fayad
Mathematics , 2005, DOI: 10.4064/aa125-4-1
Abstract: For $\theta \in [0,1]$, we consider the map $T_\a: \T^2 \to \T^2$ given by $T_\theta(x,y)=(x+\theta,y+2x+\theta)$. The skew product $f_\a: \T^2 \times \C \to \T^2 \times \C$ given by $f_\theta(x,y,z)=(T_\theta(x,y),z+e^{2 \pi i y})$ generates the so called Weyl sums cocycle $a_\a(x,n) = \sum_{k=0}^{n-1} e^{2\pi i(k^2\theta+kx)}$ since the $n^{{\rm th}}$ iterate of $f_\a$ writes as $f_\a^n(x,y,z)=(T_\a^n(x,y),z+e^{2\pi iy} a_\a(2x,n))$. In this note, we improve the study developed by Forrest in \cite{forrest2,forrest} around the density for $x \in \T$ of the complex sequence ${\{a_\a(x,n)\}}_{n\in \N}$, by proving the ergodicity of $f_\theta$ for a class of numbers $\a$ that contains a residual set of positive Hausdorff dimension in $[0,1]$. The ergodicity of $f_\a$ implies the existence of a residual set of full Haar measure of $x \in \T$ for which the sequence ${\{a_\a(x,n) \}}_{n \in \N}$ is dense.
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