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Wave Energy: Perspective On Applications, Technologies, And Challenges, Muhammad Hajj Oct 2023

Wave Energy: Perspective On Applications, Technologies, And Challenges, Muhammad Hajj

Sustainability Seminar Series

In comparison to solar and wind energy, wave energy is more predictable, and incessant with a global potential of the order of tens of thousands of terawatt-hours per year. Yet, from a readiness perspective, there has not been a prevailing design for wave energy converters for many reasons. Developing the technology requires design of components including the prime mover, foundation or mooring, power take-off, and control systems. In this talk, advances made towards realizing electric power from wave energy will be discussed. A summary of an effort supported by the US Department of Energy and led by researchers at Stevens …

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Discrete Wavelet Transform Based Cancelable Biometric System For Speaker Recognition, , Basant Abd El-Wahab Oct 2023

Discrete Wavelet Transform Based Cancelable Biometric System For Speaker Recognition, , Basant Abd El-Wahab

Journal of Engineering Research

The biometric template characteristics and privacy conquest are challenging issues. To resolve such limitations, the cancelable biometric systems have been briefed. In this paper, the efficient cancelable biometric system based on the cryptosystem is introduced. It depends on permutation using a chaotic Baker map and substitution using masks in various transform domains. The proposed cancelable system features extraction phase is based on the Cepstral analysis from the encrypted speech signal in the time domain combined with the encrypted speech signal in the discrete wavelet transform (DWT). Then, the resultant features are applied to the artificial neural network for classification. Furthermore, …

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An Apparatus For Measuring Heat Transfer Rate And Thermal Conductivity Of Tubes جهاز لقياس معدل الانتقال الحرارى والتوصيلية الحرارية للمواسير, Mohamed Hegazy, Oct 2023

An Apparatus For Measuring Heat Transfer Rate And Thermal Conductivity Of Tubes جهاز لقياس معدل الانتقال الحرارى والتوصيلية الحرارية للمواسير, Mohamed Hegazy,

Journal of Engineering Research

الملخصان معدل انتقال الحرارة والتوصيلية الحرارية هما من أکثر الخصائصالمباشرة والعملية لتقييم أداء المواد لنقل الحرارة ولا توجد طريقة واحدة يمکناعتمادها لقياس الخواص الحرارية للمواد ولکن تقتصر کل طريقة قياس لتحديدالتوصيلية الحرارية على نطاق محدد من قيم التوصيلية الحرارية ودرجاتالحرارة وأنواع معينة من المواد ولا يتم تطبيق طرق قياس التوصيلية الحراريةعلى عينات عشوائية ولکن لکل طريقة يلزم وجود عينة قياسية لها بتصميموأبعاد محددة ومثال على ذلک يتم استخدام عينة دائرية بقطر نصف بوصةمغطاة بطبقة من الجرافيت لتکون معتمة تمامًا في طريقة القياس من نوعيةFlash Laser . ولکن في طريقة Guarded Hot Plate يتم استخدام لوح علىشکل متوازى مستطيلات ذو دقة …

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Analysis Of Flow Field Behind A Road Vehicle With/Without Rear Air Spoiler, Mohamed Elmidany, Oct 2023

Analysis Of Flow Field Behind A Road Vehicle With/Without Rear Air Spoiler, Mohamed Elmidany,

Journal of Engineering Research

A particle image velocimetry (PIV) technique has been used to analyze the flow characteristics behind a road vehicle with/without an air spoiler attached on the behind end and also to estimate its effect on the wake. A vehicle model scaled in the ratio of 1/18 is set up in the mid-section of a closed-loop wind tunnel. The Reynolds number based on the vehicle length is taken in the range of 16.37x103 up to 3.77x105, i.e. (V = (2 to23.7 m/s). Measurements are carried out on the planes parallel to the free stream to investigate the two-dimensional structure of the flow …

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Intelligent Over-Vibration Protection Modeling & Simulation For Three Phase Induction Motor, Ayman Eissa Oct 2023

Intelligent Over-Vibration Protection Modeling & Simulation For Three Phase Induction Motor, Ayman Eissa

Journal of Engineering Research

This paper presents an intelligent over-vibration simulation and protection preference for three phase medium and high power induction motor. Three phase induction motor is widely used in industry because they are rugged, reliable and economical.Monitoring and over-vibration protection of machines can avoid consequential damage and avoid its consequences.The effect of three main different abnormal operating cases which are rotor unbalance,shaft coupling misalignment and torque pulsations on the rotor vibration are examined.The results are collected and evaluated for motor status. Rotor unbalance and shaft coupling misalignment will cause radial vibrations,while torque pulsations will cause torsional vibrations.The vibration analysis and simulation is …

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Design Of Integrated Millimeter Wave Microstrip Pseudo-Interdigital Band Pass Filter Using 0.18Μm Cmos Technology, Nessim Mahmoud Oct 2023

Design Of Integrated Millimeter Wave Microstrip Pseudo-Interdigital Band Pass Filter Using 0.18Μm Cmos Technology, Nessim Mahmoud

Journal of Engineering Research

High selectivity design of an improved on-chip band pass filter for 60 GHz millimeter-wave applications using0.18 μm CMOS technology is presented. A new type of miniaturized microstrip bandpass filters with pseudo- interdigital structure without via holes grounded resonators is described. A very compact filter of this type, having a size less than quarter-wavelength by quarter-wavelength at a mid-band frequency of 60 GHz was designed. The adoption of a pseudo- interdigital BPF and utilization of two transmissions zero permits a compact size and high selectivity for the BPF. Besides, two defected ground structure cells are etched under the coupled lines to …

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Using Of Calcined Clay In Soil Subbase Materials, Nesreen Elawadly, Oct 2023

Using Of Calcined Clay In Soil Subbase Materials, Nesreen Elawadly,

Journal of Engineering Research

The paper presents results of study on soil subbas improvement. The main object of the study was using the recycled calcined clay to get rid of it by a useful friendly environmental method. Big amount of waste refractory bricks were outcome with Portland cement manufacturer. The study presents recycling this waste calcined clay with crushing it into graded aggregates. Coarse crushed (CR) and fine crushed (FR) recycled calcined clay were the products which studied. Kaolin (KA) and Metakaolin (MK) were two other types of calcined clay materials have been studied in this paper to find out it’s suitability as a …

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Performance Of Laterally Loaded Model Finned Piles In Clay Soil, Moataz Wahba, Oct 2023

Performance Of Laterally Loaded Model Finned Piles In Clay Soil, Moataz Wahba,

Journal of Engineering Research

Finned piles are a novel pilling technique which is used as a foundation for many structures such as: transmission towers, bridge abutments, ocean engineering structures, marine dolphins, dock-fendering systems and moorings that subjected predominantly to both laterally loads beside the vertical loads.This paper presents a series of experimental tests that were conducted to lateral loaded piles with/without fins in clay. Piles with different types were fitted with different fins geometry and numbers. The results of this study indicated that the pile lateral capacity increased and the horizontal deformation of pile decreased at thesame load level after mounting fins is compared …

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Investigation Of 3d Polynomial Model For The Geometric Correction Of Geoeye Imagery, Samah Abo Ramadan, Oct 2023

Investigation Of 3d Polynomial Model For The Geometric Correction Of Geoeye Imagery, Samah Abo Ramadan,

Journal of Engineering Research

GeoEye satellite has provided the world with high spatial resolution 0.50 meter panchromatic images. Not only the high spatial resolution, but also the high spectral, radiometric and temporal resolutions of GeoEye imagery make it ideally suited for mapping applications. Currently, the empirical sensor models are traditionally employed, instead of the physical models, to establish the mathematical relationships between the image space and the ground space. In this study, the geometric accuracy of pan GeoEye images was determined using three dimensional (3D) polynomial model. The obtained planimetric accuracy was compared to that obtained using the rational function model (RFM). The implementation …

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Using Multiple Shifts To Apply Ccpm Principles In Construction, Ehab Elhosary, Oct 2023

Using Multiple Shifts To Apply Ccpm Principles In Construction, Ehab Elhosary,

Journal of Engineering Research

For many construction projects, It is common for the customer to pay an incentive to the contractor for finishing the project in a shorter length of time. In contrast, the contractor pays delay penalties if the project is delayed. Goldratt 1997 suggested critical chain project management method (CCPM) as an attempt for minimizing project duration. Goldratt approach and related buffer sizing approaches result in different values of project buffer and feeding buffer which do not satisfy construction projects circumstances. The proposed model uses multiple shifts and discrete relationship between activity time and cost to be solved by integer programming to …

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The Moment-Gradient Factor In Lateral– Torsional Buckling Of Castellated Steel Beams Under Mid-Span Concentrated Load, Aza Elagamey, Oct 2023

The Moment-Gradient Factor In Lateral– Torsional Buckling Of Castellated Steel Beams Under Mid-Span Concentrated Load, Aza Elagamey,

Journal of Engineering Research

increasing the value of ( ) H / ho anddecreasing the value of ( ) w w t / h .On theother hand, the influence of ( ) 4 w h / b hasnoticed effect on the value of bC especiallyin big opening. The studies extended toinvestigate the non-compact sections tocompare the values of bC in the case ofcompact and non-compact sections withthe predicted design codes. It is found that,the values of b C in short spans have lowervalues than the predicted design codes.Hence, simplified empirical Equationsof bC are proposed for compact and noncompactsection based on the best fit of …

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Proposed Selection Criteria Of Contractors In The Egyptian Construction Projects Biddings, Ahmed Atia, Oct 2023

Proposed Selection Criteria Of Contractors In The Egyptian Construction Projects Biddings, Ahmed Atia,

Journal of Engineering Research

The difficulty of selection of contractors in Egypt as a result of multiple and different criteria to select contractors and the different relative weights from one project to another has always been the main factors of the problem. There is a need to determine selection criteria of contractors for construction projects, as well as determine relative weights of the selection criteria. This issue has been of interest for many decades and remains a contemporary subject because of the rapid modernization of construction project management. This research utilizes an investigation approach to achieve the research goals and design and perform a …

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The Role Of Soft Mobility Towards Strengthening Urban Transformation And Sustainable Well-Being: Case Study: Mansoura City, Egypt, Mai Madkour, Oct 2023

The Role Of Soft Mobility Towards Strengthening Urban Transformation And Sustainable Well-Being: Case Study: Mansoura City, Egypt, Mai Madkour,

Journal of Engineering Research

This research investigates the method of soft mobility role on Egyptian neighborhood unit. It discusses itsrelationship with the main principles of New Urbanism. And proposes some objectives: Interpret Mobilitynew concepts in New Urbanism, cite urbanism principles and its trends to conclude soft mobility indicators,design a matrix inventories the compatibility of soft mobility indicators and behavioral dimension. And atlast, the matrix tests the combination of indicators and dimensions in an Egyptian traditional urban fabric,at Mansoura City.

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Methodology To Evaluate Acoustic Performance In Educational Spaces By Different Methods, Aly-Aldean, Rania Oct 2023

Methodology To Evaluate Acoustic Performance In Educational Spaces By Different Methods, Aly-Aldean, Rania

Journal of Engineering Research

Different methodologies used to evaluate acoustic performancein ineducational lecture hall. Theses technical methods have been used in order to define theacoustic problems in lecture hall and suggest acoustic and architecture treatments to solvethese acoustic problems. The methods that used for acoustic analysis were Sabin, Eyring,Arau-puchades and ODEON. This paper is foucing on acoustic performance in lecturehall 2 in Tanta Engineering. Acoustic study has been done for lecture hall as follows:Evaluation the acoustic performance by field measurements for reverberation time,manual calculation and acoustic simulation; ODEON software. Different acousticperformance analysis was performed. Different acoustic and architecture treatments weresuggested based on the analysis. …

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"تأثير الصوت والتهوية على البيئة التعليميه الخاصه بأطفال المتلازمه داون The Effect Of Sound And Ventilation On The Educational Environment For Children With Down Syndrome, سهام الموزي, Oct 2023

"تأثير الصوت والتهوية على البيئة التعليميه الخاصه بأطفال المتلازمه داون The Effect Of Sound And Ventilation On The Educational Environment For Children With Down Syndrome, سهام الموزي,

Journal of Engineering Research

دائما ما يبحث المعماري عن کيفية تنظيم الفراغ وتوظيفه واستغلاله بصورة جيده ليمکن المستخدم من أداء وظيفته وممارسةالأنشطة المختلفة فى راحة وظروف ملائمة ، حيث نجد ان عناصر تصميم أى فراغ لها تأثير مباشر على المستخدم ، فکل مانلمسه بأيدينا ويقع عليه بصرنا وتسمعه أذاننا وتتفاعل معه کافة حوسنا يعتبر جزء من التجربة الفراغية المعمارية .کذلک فإن مصمم الفراغ يتجه دائما من خلال عناصر التصميم الى تلبيه الاحتياجات النفسية للمستخدم والتى تؤثر فى اتجاهاتهوافکاره وأرائه وميوله وسمات شخصيته وتحقيق له الراحة الحسية والنفسية .ويختص هذا البحث بدراسه وتتبع اهم الجوانب المحيطة بطفل المتلازمة داون ، والمؤثره على إدراکه وانطباعاته النفسية …

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Evaluation Of Visual Performance Of Religious Urban Open Spaces (Case Study: Al- Sayyida Nafisa Mosque Square In Cairo, Egypt) تقييم األداء البصرى للفراغات العمرانية ذات الطابع الدينى )دراسة حالة فراغ مسجد السيدة نفسية بالقاهرة - مصر(, Mohammed Ibrahim Ali, Nourhan Oct 2023

Evaluation Of Visual Performance Of Religious Urban Open Spaces (Case Study: Al- Sayyida Nafisa Mosque Square In Cairo, Egypt) تقييم األداء البصرى للفراغات العمرانية ذات الطابع الدينى )دراسة حالة فراغ مسجد السيدة نفسية بالقاهرة - مصر(, Mohammed Ibrahim Ali, Nourhan

Journal of Engineering Research

The visual performance of Al- Sayyida Nafisa Mosque Square in Cairo is analyzed in this paper. The aim of the present study is to derive a proposed evaluation model that service as a tool for evaluating the visual performance of religious urban open spaces. The research also tries to reach the best visual basics and criteria which support the design and planning process that must be taken in consideration when dealing with the religious urban open spaces. Research results showed that legibility, identity, determinants, aesthetics consistency, sense of nature, and supplements of urban open space help in enhancing the visual …

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Combined Dms And Dgs Techniques For Compact And Low Cutoff Frequency Lpf Design, Meeper, Sara Oct 2023

Combined Dms And Dgs Techniques For Compact And Low Cutoff Frequency Lpf Design, Meeper, Sara

Journal of Engineering Research

high performance and compact size low pass filters with narrow stopband and sharp cutoff characteristics are highly required in numerous wireless communication systems for noise and interference suppression. In this paper, a compact microstrip LPF with sharp cutoff characteristics is introduced. Defected ground structure (DGS) and defected microstrip structure (DMS) have been used to obtain wide stopband. The proposed filter is composed of two arc-shaped DGS units in the ground plane and a shaped microstrip line where stub and inset feed matching techniques is attached to enhance the pass band characteristics. This structure allows sharp cutoff frequency response and high …

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Topological Approximations Based On Relations Induced From Differences, Rashed, Rukaia Oct 2023

Topological Approximations Based On Relations Induced From Differences, Rashed, Rukaia

Journal of Engineering Research

The starting point of rough set theory is the indiscernibility relation, which is generated by information about objects of interest. The indiscernibility relation is intended to express the fact that due to the lack of knowledge we are unable to discern some objects employing the available information. Therefore, generally, we are unable to deal with single object. Nevertheless, we have to consider clusters of indiscernible objects. In this paper, a relationship was created through a table of given data. This relationship is based on the expert's opinion in the field of data. Based on this relationship, we constructed a topological …

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Removing Of Toxic Cr (Vi) Ions From Wastewater Using Different Adsorbents., Derweesh , Mona Oct 2023

Removing Of Toxic Cr (Vi) Ions From Wastewater Using Different Adsorbents., Derweesh , Mona

Journal of Engineering Research

The removal of hexavalent chromium from wastewater on the Na-bentonite and activated carbon has been studied under static conditions. Experiments were carried out as a function of solution pH, dosage of Na-bentonite and activated carbon contact time, agitation speed and temperature. The adsorption equilibrium for hexavalent chromium on to Na-bentonite is reached in 120 min. the adsorption of hexavalent chromium is pH dependent in the pH range 1-4, the kinetic process of adsorption can be described by the pseudo-second order kinetic equation excellently and the adsorption isotherm be fitted to the langmuir and freundlich model by means of regression analyses …

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Evaluation Structural Strength For Beams And Two-Way Roof Slab Systems Using Core Test And Load Test And Analyzing The Causes Of Their Failure., Al Zuhaili, Mohammad Oct 2023

Evaluation Structural Strength For Beams And Two-Way Roof Slab Systems Using Core Test And Load Test And Analyzing The Causes Of Their Failure., Al Zuhaili, Mohammad

Journal of Engineering Research

This paper discusses Core Test and Load Test as a method to evaluate Structural Strength for existing structural system. The primary objective of the two methods is to assess structural strength, safety and serviceability. Failure in beams and roof Slabs structural strength were targeted to determine the causes of the failure, and further analysis has been done to suggest the best methods to repair the defected structural system. In this paper a two-way roof slab system for two different vacant villas in Kuwait City was inspected, at different construction time intervals. As a result, weakness in concrete strength was present, …

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Membership Function Based On Similarity And Dissimilarity, Elsodany , E. Oct 2023

Membership Function Based On Similarity And Dissimilarity, Elsodany , E.

Journal of Engineering Research

Deciding membership function of an object to uncertain class of objects in an information system is essential particularly, all things considered, displaying issues. This paper will present a comparison between different ways of constructing membership function of an object. We initiate a concept based on dissimilarity and similarity between objects using values of their features. The fundamental tool is classes resulted from dissimilarity and similarity. We will also express a classification relation and minimum and maximum memberships correspond to these classifications.

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Structural Performance For Wide-Shallow Beam In Shear (Comparative Study), Behiry, R. Oct 2023

Structural Performance For Wide-Shallow Beam In Shear (Comparative Study), Behiry, R.

Journal of Engineering Research

Many floor systems contain wide shallow beams to carry floor loads and transfer it to columns. For example, in bridge construction, a system of wide shallow beams (WSBs) may provide a simple and economical system to transfer loads from the slab deck to columns. In many of these design situations, it is often advantageous to use different member widths to minimize reinforcement conflicts and reduce overall congestion. This geometrical peculiarity deserves some attention and caution while dealing with the behaviour at ultimate limit states for shear and flexure. Seven wide-shallow beams with edge columns specimens were used to investigate the …

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Performance Of A Pyramid Solar Still With Stepped Trays: Experimental Approach, Ismail, M. Oct 2023

Performance Of A Pyramid Solar Still With Stepped Trays: Experimental Approach, Ismail, M.

Journal of Engineering Research

The present experimental work aims to enhance the daily productivity of solar stills. A stepped pyramidal still with three trays was fabricated and tested under Tanta conditions, Egypt in September 2016. The still was tested with the brine feed being uninterrupted in one experiment, and with intermittent brine supply in another experiment. For continuous brine supply, the accumulated distillate was 4.95 L. For intermittent brine supply, the accumulated distillate was 4.6 L. Per unit total area, the average daily distillate water productivity is 5.5 and 5.11 L/m2 for the continuous and the intermittent feed stills, respectively. In the two ways, …

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Automated Optimization Of Centrifugal Compressors “Eckardt Rotor O”, Khalil, Mohamed Oct 2023

Automated Optimization Of Centrifugal Compressors “Eckardt Rotor O”, Khalil, Mohamed

Journal of Engineering Research

Centrifugal compressors play an important role in many industries. Improving the efficiency of centrifugal compressors and extending their range has been an important subject for both engineers and researchers working in the turbomachinery field. This paper discusses the optimization of Eckardt O impeller through changing its blade angles distribution to increase its efficiency. the optimization process is performed using an automated procedure performed within ANSYS workbench. The geometry is parameterized using ANSYS design modeler, the mesh is generated using ANSYS Turbogrid and steady flow CFD results are obtained using ANSYS CFX. Optimization by genetic algorithm is done using a surrogate …

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Experimental Study Of Cotton Stalks Gasification In A Downdraft Reactor, Rabea , Karim Oct 2023

Experimental Study Of Cotton Stalks Gasification In A Downdraft Reactor, Rabea , Karim

Journal of Engineering Research

Biomass gasification process is considered a promising waste-to-energy conversion technique to eliminate the immense environmental issues accompanied with open field burning. The objective of this study is to experimentally study the dynamic behavior of an Imbert based design manufactured bench scale gasifier using cotton stalks as a feed stock. Air was employed as a gasifying agent with a biomass batch feed of 4 kg. The gasification process characteristics are evaluated in terms of lower heating value, gasification efficiency, and operation time. The applied air flow rates are (60, 100, 150, and 200 l/m) achieving varied equivalence ratios between 0.362 – …

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Numerical Study For Performance Evaluation Of Plastic Solar Air Heater With Different Cross-Sectional Configuration, Ebied, E. Oct 2023

Numerical Study For Performance Evaluation Of Plastic Solar Air Heater With Different Cross-Sectional Configuration, Ebied, E.

Journal of Engineering Research

In this research, a numerical investigation was performed on five solar air heaters with different cross-sectional shape to find the best configuration relevant to thermal performance. The selected tested shapes in this study were (circular, semi-circular, half-circle plus isosceles triangle, half circle-negative isosceles triangle shape and crescent shape) and all tested shapes hade the same absorber surface area. The effect of two parameter (velocity and solar radiation intensity) on thermal performance of solar air heater were studied numerically by ANSYS 14.0. The velocity of air was changed from 0.25 to 2.0 (m.s -1 ). Results indicated that the highest efficiencies …

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Tennessee Labor Market Report, August 2020, Goods-Producing & Service-Providing Employment, Tennessee. Department Of Labor & Workforce Development. Oct 2023

Tennessee Labor Market Report, August 2020, Goods-Producing & Service-Providing Employment, Tennessee. Department Of Labor & Workforce Development.

Labor Market Reports

No abstract provided.

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Why The Optimal Long-Run Tax Rate On Capital Is Zero . . . Or Very High: The Missing Explanation, Chris William Sanchirico Oct 2023

Why The Optimal Long-Run Tax Rate On Capital Is Zero . . . Or Very High: The Missing Explanation, Chris William Sanchirico

Florida Tax Review

Judd’s (1985) finding that the optimal long-run rate of tax on capital is zero—even if equity is an important social objective—has exerted substantial influence in academic and policy circles over the last several decades. Only very recently has it become clear that Judd’s zero-tax result rests on an implicitly adopted assumption about how savings responds to taxation. Working within the very same model structure, Straub and Werning (2020) demonstrate that the optimal long-term tax rate is positive and potentially large under an alternative, equally plausible assumption. This Article attempts to fill a remaining gap in the literature by providing a …

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Full Taxation: The Single Tax Emperor's New Clothes, Leopoldo Parada Oct 2023

Full Taxation: The Single Tax Emperor's New Clothes, Leopoldo Parada

Florida Tax Review

It has recently been argued in the international tax literature that the OECD Base Erosion and Profit Shifting project (BEPS) reflects and effectuates full taxation, namely an international norm that would suggest that all of a company’s income should be taxed in places where it has real business activities, representing a modern approach to the single-taxation paradigm. This Article builds upon the concept of full taxation and argues that although rhetorically attractive, the concept is still conceptually inconsistent, particularly because it is incapable of providing any hints as regards where and who should finally be taxed. Moreover, it adopts an …

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Designing Aviation Taxes Within The Eu—Chartering Ongoing Challenges And Proposing Future Solutions, Yvette Lind Oct 2023

Designing Aviation Taxes Within The Eu—Chartering Ongoing Challenges And Proposing Future Solutions, Yvette Lind

Florida Tax Review

This Article focuses on environmental taxes, specifically aviation taxes, and the challenges and limitations EU law imposes on individual EU Member States when they attempt to enforce both national and international environmental policy goals. Both the former Irish and the recently implemented Swedish aviation tax are used as comparative examples when chartering and discussing what (legal) obstacles are posed by EU law and, subsequently, the options available to individual Member States when attempting to design and implement environmental taxes. Further, common political obstacles are addressed in the Swedish and Irish case studies to further enhance the understanding of why and …

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