Engineering Commons^™

Three Dimensional Deformable Modeling Of The Spine, Rania Atef

Archived Theses and Dissertations

The purpose of this work is the development of a 3D deformable model of the spinal lumbar region. The data for the spine comes from the National Library of Medicine website (NLM). The 3D model uses several NURBS patches as modeling primitives. This work is part of a larger system aimed at building a 3D surgical simulator coupled with a force - feedback.PHANToM robot in a virtual reality CA VE system.

The input to this system is a set of two-dimensional CT images. They are processed and edge detected to produce a set of contoured images containing the vertebral data. …

Classification Of Risks For International Construction Joint Ventures Projects, Yasser Abd El Ghany Azmy Elshabassy

Archived Theses and Dissertations

No abstract provided.

Building General Indicator Cost Indexes For The Construction Industry Price Movement In The Egyptian Market, Bahaee Nabil Labib Khalil

Archived Theses and Dissertations

This thesis (The "Thesis") is submitted to the Department of Engineering at the American University in Cairo in partial :fulfillment of the requirements for the degree of Master of Science. The aim of the Thesis is Building General Indicator Cost Indexes for the Construction Industry Price Movement in the Egyptian Market. It is prepared by Bahaee N. L. Khalil under the supervision of Dr. Amr A. G. Hassanein (Associate Professor, Construction Engineering Department, the American University in Cairo). Construction cost indexes is mainly utilized in planning estimates required at an early stage of a project conception to assist with the …

Interaction Of Silica Fume And Polypropylene Fibers In High Performance Concrete, May Tarek Massoud

Archived Theses and Dissertations

The use of mineral admixtures and fibers is becoming essential in the new generation of high performance concrete since they introduce enhancement in mechanical properties as well as several durability aspects. Some of the advantages gained when properly employing high performance concrete are significant improvements in strength, drastically reduced permeability, better resistance to a wide spectrum of chemicals, superior performance in freezing and thawing conditions and enhanced thermal resistance. Although silica fume and polypropylene fibers are increasingly used in high performance concrete, yet, relatively little work has focused on the interaction of both ingredients in such concretes. The main aim …

Enhancing Image Classification And Content Query Using Perception-Based Models, Ahmed Badr El-Din

Archived Theses and Dissertations

Searching a digital image library, having large number of digital images or video sequences turned to be more and more important in this multimedia age. As time passes, a growing number of people are using the Internet for searching and browsing through different multimedia databases. To make such searching practical, effective image coding and searching based on image semantics is becoming increasingly important. In current real-world image databases, the prevalent retrieval techniques involve human-supplied text annotations to describe image semantics. These text annotations are then used as the basis for searching, using mature text search algorithms that are available as …

Marketing Characteristics Of The Service Of Project Management In Egypt, Mohamed Ali Alhadidi

Archived Theses and Dissertations

The Project Management profession has been facing, since its introduction, a serious impediment establishing a significant and well-defined role among the Egyptian construction community. In an attempt to uncover the reasons behind this impediment, a problem identification research was conducted with service-provider firms of different sizes, origins, and backgrounds. The research confirmed the observation. It also arrived at the main obstacle hampering the development of Project Management in Egypt. This obstacle was the poor communication of the service and its benefits to the market. A barrier, built of mismarketing, has therefore parted between Project Management professionals and their clients. This …

Construction Delays Of High Investment Projects In Egypt, Nora Mohamed El-Gohary

Archived Theses and Dissertations

In evaluating the overall performance and success of construction projects, time is usually used as a major factor in such evaluation. Unsatisfactory time performance shows up as delays. Construction delays are very critical to the owner and contractor, because they suffer due to lost profit, additional overhead costs, increased costs of financing, and payment of liquidated or actual damages. Despite that, delays in completion of projects are repetitive in the Egyptian construction industry. Current Egyptian statistics and studies did not provide sufficient information and analysis of the delay phenomenon. Studying and analyzing the problem is a step towards its solution …

A Water And Wastewater Sector Performance Assessment: A Comparative Study, Reham Khalifa

Archived Theses and Dissertations

The water and wastewater sector has been one of the infrastructure sectors gaining increasing importance recently. Governments have been focusing major efforts and significant volumes of their budgets towards the improvement of this sector and the increase of water and wastewater coverage. The key problem in most of the water_and wastewater utilities is the absence of performance assessment tools.

This research utilizes the calculation of a group of financial and operational indicators for a sample size of 234 utilities from countries across the world as a mean of comparison of their performance. Egypt is represented in the sample size by …

3d Finite Element Modeling Of The Welding Process, Ihab Fanous Zakaria

Archived Theses and Dissertations

The modeling and simulation of the welding process has been of main concern for different fields of applications. It is used mainly to check for the residual stresses generated due to welding. These stresses may reach a value near the yielding level and may cause several failure types in the welded strnctures. Several attempts have been clone in analyzing the welding process using different approaches. Analytical methods have been developed with many approximations and assumptions to handle the highly non-linear behavior of the problem. On the other hand, experimental methods in monitoring the residual stresses in a welded structure may …

Management Of Change Order Claims In The Egyptian Industrial Construction Sector: Analysis And Means Of Improvement, Waleed El Nemr

Archived Theses and Dissertations

The term claim has become a word of paramount significance on construction projects worldwide. Throughout .the past decade, several research works in Europe and North America have been dedicated to exploring the causes of claims and solutions that would help minimize their occurrence and possibly prevent them. This research is the first of its kind in Egypt, as it attempts to help gain a deeper insight of the status of claims management from the contractors perspective with respect to the Egyptian industrial construction sector. Special attention is given to change order claims, as this research demonstrates them as a major …

Impact Of Lignin From Non-Wood Pulping Processes On Kraft Wastewater Treatment And Receiving Water Quality, Mohamed Hamdy Nour

Archived Theses and Dissertations

The Kraft process is typically used for pulping non-wood raw materials, I ike rice straw, in order to dissolve the non cellulose organic fraction, essentially lignin, and leave behind the fibrous residual as pulp for paper production. Rice straw, however, also contains a high percentage of silica that dissolves in the process. The wastewater derived from vacuum filtration of the pulp solution is referred to as black liquor, owing to its dark color and complex makeup with high BOD, caustic, silica, and TDS. The high silica concentration in the black liquor prohibits conventional chemical recovery due to scaling of the …

Three-Dimensional Modeling Of The Lumbar Spine For Simulation Purposes, Ayman Hamdy Mohamed Kassem

Archived Theses and Dissertations

Human spine modeling started gaining its popularity in world war II for military purposes as a result of studying the phenomenon of pilot spine cracking during ejection. It started with simple beam modeling and continued to get more complicated and realistic. Modeling the spine is a challenging problem because of its detailed anatomical structure, the motion of soft and bone tissues and the deformations that occur during different loads. Realistic spine modeling is expected to have a significant impact in a world where spinal injuries and deformities account for a large percentage of all injuries. In this research, a spinal …

An Optimal Production Plan In A Make-To-Stock Manufacturing Environment Using Mixed Integer Programming, Amr Mohamed Nofal

Archived Theses and Dissertations

The main aim of this thesis is to develop an optimization model that provides an optimal production plan for a make-to-stock (MTS) manufacturing environment that includes the production of multi products on multiple machines over a definite number of planning periods. While optimizing the production plan and inventory levels for this general problem under study, a set of constraints will be kept throughout the planning horizon. These constraints include maximum production capacity, maxrmum storage capacity, minimum and maximum coverage, minimum production quantities and others. Mixed integer programming (MIP) will be used as a tool to optimize the total cost involved …

The Use Of Information Technology In Providing Government Services In Egypt, Sherif Ahmed Sherif

Archived Theses and Dissertations

Futurist Alvin Toffler (1980) wrote about three "waves" of civilization. Ln the First Wave, agiiculture enabled nomadic peoples to settle into villages and cities. In the Se;:ond 'Nave, the industrial revolution made possible the modem industrial state. The Third Wave has begun in which computer and communications technologies will transform the national and global economies into information driven economies. The Third wave triggers the Information Revolution which will have political and societal impacts every bit as profound as those of the First and Second Waves.

Throughout human history, mankind has witnessed incremental changes as well as sudden sweeping transformations. In …

Framework For Developming A Standard Construction Information Classification System For The Egyptian Construction Industry, Rehab M Anwar Wahch

Archived Theses and Dissertations

The construction industry is known to be rich with information. Yet to-date there is no available system that standardizes this inormation so that it can be used as a common system throughout the design, construction, and management of a project and supports view conversion especially when different participants in building and construction represent different disciplines, each having his own view on information. This form of information standardization is termed as "construction information classification system (CICS) ". Currently the Egyptian industry does not have an adequate standardized construction information classification system (CICS). The only available systems in use are company-specific internal …

Assessing Bacterial Pollution Of Reclaimed Wastewater For Irrigation Reuse, Sherif Youssef Hegazy

Archived Theses and Dissertations

No abstract provided.

Small Construction Firms, Samih Wahid Adly

Archived Theses and Dissertations

No abstract provided.

Integrated Construction Project Planning, Umar Farouk Dolleh

Archived Theses and Dissertations

No abstract provided.

Establishing A Waste Management System For Imbaba Fever Hospital, Wafik H Matta

Archived Theses and Dissertations

No abstract provided.

The Modified Hash Chain Sealed Bid Auction Protocol, Riham Hassan Abdel-Moneim

Archived Theses and Dissertations

No abstract provided.

Underwater Concrete, Dina Adel Nakhla

Archived Theses and Dissertations

Underwater structures represent a significant portion of concrete works worldwide. The utilization of various underwater concrete techniques has indeed minimized the use of costly dewatering processes. Such techniques include the use of special· equipment such as trernie concrete and preplaced aggregate technique. The incorporation of antiwashout admixtures has evolved as a method to minimize the washout of cement and fine particles. As for today, there exists relatively limited information regarding different underwater concreting techniques to facilitate feasible and adequate selection of appropriate methods. This work comprises a survey study and an experimental work to evaluate the impact of using the …