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Mathematical Model For Frost Formation On Plane Surface., Ahmed Ahmed Sultan

Mansoura Engineering Journal

Suggested model covers the necessity of calculating the effect of frost formation, on the evaporator wall in cooling storage rooms, on the heat transfer efficiency between refrigerant and wet air. In it obtained analytical relationships for temperature distribution in both wall material and frost layer, overall heat transfer coefficient and the time of frost layer formation as a function of frost layer thickness.

Heat Transfer From Constant Heat Flux Cylindrical Wall To Liquid Flow Through Packed Beds., Ahmed Ahmed Sultan, E. El-Shafei

Mansoura Engineering Journal

Results are reported here for an experimental investigation of the local heat transfer of water flowing through vertical circular tube of 15 mm inside diameter and 370mm length, packed with a spherical steal particles of diameter 3.2 and 1.07 mm. The tube is heated electrically with a constant heat flux on the wall. During this work Reynolds number was varied from 10 to 10000 and prandtl number was about 7. Results show that, in the laminar flow region the ratio of thermal entrance length to inner tube diameter is equal to 7, while in the turbulent flow region this ratio …

Flash Temperature For W/N Circular Arc Gears., Ahmed El-Bahloul

Mansoura Engineering Journal

The flash temperature is one of the important factors for evaluating the scoring resistance of the gear teeth. In the present paper a numerical solution of the flash temperature for W/N circular arc gear due to moving heat source is done taking into account the partitioning of the heat in the contact zone to each tooth and all the variables for the design of this type of gears. Tooth load speed of rotation, module, radii of curvature, helix angle, gear ratio, number of teeth and contact ratio are considered. The theoretical results of the flash temperature arte presented and discussed …

Analytic Solution Of Two-Dimensional Transient Heat Conduction., Bishri Abdel-Hamid, Mohamed Mahgoub

Mansoura Engineering Journal

No abstract provided.

Factors Affecting Drag Reduction By Non Ionic Surfactant Additives., M. Hamza, I. Saleh, S. Nasr

Mansoura Engineering Journal

Drag reduction by using certain polyoxyethylene alcohol non-ionic surfactants dissolved in water has been investigated experimentally. For these compounds it is proved that the mechanical degradation is reversible and the drag reduction is regained when shear stress is decreased. For solvent Reynolds number ranges from 103 to 2x105 in tubes of 6.17. 2.69 and 0.81mm, the effects of concentration electrolytes addition and mechanical shear on the drag reduction at/or near the could point temperature have been investigated experimentally. The drag reduction was found to be maximum at/or near the cloud point.

Drag Reduction In Pipelines By Cationic Surfactant Additives., M. Hamza, I. Saleh, S. Nasr

Mansoura Engineering Journal

This work is concerned with the drag reduction using cationic surfactants. (quaternary ammonium amine-sodium salicylate)dissolved in water. Drag reduction measurements were carried out in 6.17 and 2.69 mm diameter tubes, for Reynolds numbers from 101 to 106 and for temperature range of 30o to 120o C. The influence of surfactant composition. Temperature, mechanical shear, concentration and sodium salicylate concentration on the dragreduction were investigated. Trimethyl amine salts are most effective drag reducing agents. While alkyl dimethyl ammonium amine salts are not affective. Length of alkyl group has a major affect on the upper temperature limit for drag reduction. Appreciable amount …

Utilization Of Textile Wastes In Nonwovens - Part I: Properties Of Industrial Needle Punched Nonwovens Out Of Textile Wastes., Adel El-Hadidy

Mansoura Engineering Journal

The rag waste has been opened using "CGC" processes to be used in the production of nonwoven fabrics for various end uses. It is clear that as the fibre length decreases the compression characteristics will be improved. It was found that as the number of beater increases the quality number and (%) damage increased also. The survey of the methods of production of nonwoven out of textile waste is given. It was found that the coefficient of exploitation (K) for nonwovens out of textile waste ranges between 8% and 12%. The coefficient of variation of nonwoven fabric thickness which is …

Theoretical Prediction Of The Pore Size Of Woven, Knitted And Nonwoven Filter Fabrics., Hemdan Abou-Taleb

Mansoura Engineering Journal

The present investigation deals with the study of pore size of filter fabrics. Theoretical expressions are derived for calculating the pore equivalent diameter of woven, knitted and nonwoven filter fabrics. Experimental results were obtained by using a new simplified apparatus. This apparatus has been designed by the author on the base of bubble-pressure method. The derived relations were found to be fairly close to those observed experimently.

Study Of Some Affecting Parameters On Warp Strength In The Woven Fabric., A. Shahin, A. El-Deeb

Mansoura Engineering Journal

In this work the effect of weaving machine speed and stroke of heald shafts on waven warp strength was measured. The strength of sized warp threads was measured before weaving process. And the yarn strength was measured for the woven fabric for two different weaving machine speeds (650 and 850 picks/min). The raveled warp threads from the woven fabric were choosen for marked threads in the first and last heald shaft. Also some of the mechanical characteristic of warp threads was measured before and after sizing process. Theoretically the dynamic motion of heald shaft was derived for air jet weaving …

Influence Of The Cleaning Operation On The Quality Of The Yarn., Rizk El-Bealy, Mahmoud Talat

Mansoura Engineering Journal

The object of the present work is to study the influence of the progress of cleaning operation on cleaning action, neps per gram and yarn characteristics. The results of industrial evaluations, using three varieties of Egyptian cotton fibers, To produce ring-spun yarns ranged from carded to combed qualities, are presented. For all cotton fibers, comparison of the processing performance of a three cleaning units with Masterclean concept are favourable to the new cleaning unit (MAC). The modern set alone provides up to 64% cleaning efficiency and lower lint loss at 460 kg/hr production. Also, the results emphasize the high trash …

Quality Assessment Of Nonwoven Air Filters Used In Fertilizer Factories., S. Ibrahim, M. El-Messiery, Hemdan Abou-Taleb, M. Salama, N. Mostafa

Mansoura Engineering Journal

Two experimental techniques used to evaluate fabric filtration efficiency. Gas filtration apparatus and another apparatus used optical techniques based on laser doppler velocimeter are constructed. The filtration efficiency have been measured for a wide varity of non-woven filter fabrics. Excellent agreement has been found between the two techniques. The necessary performance characteristics of air filter fabrics could be selected and arranged carefully in decreasing order of importance. In this paper several methods are used to assess the quality of some nonwoven fabrics as air filters similar to those filters used in the fertilizer factory. Complex evaluation of quality methods have …

Reconstructing The Changes In Sedimentation And Source Provenance In East African Hydropower Reservoirs: A Case Study Of Nyumba Ya Mungu In Tanzania, Aloyce I.M. Amasi, Maarten Wynants, Remegius A. Kawalla, Shovi Sawe, Linus Munishi, William H. Blake, Kelvin M. Mtei

School of Geography, Earth and Environmental Sciences

This study aimed to reconstruct the sedimentation rates over time and identify the changing sources of sediment in a major hydropower reservoir in Tanzania, the Nyumba ya Mungu (NYM). Fallout 210Pb measurements were used to estimate age of sediment deposits and broad changes in sedimentation rates were reconstructed. Sedimentation peaks were cross referenced to geochemical profiles of allogenic and autogenic elemental constituents of the sediment column to confirm a causal link. Finally, geochemical fingerprinting of the sediment cores and potential sources were compared using a Bayesian mixing model (MixSIAR) to attribute the dominant riverine and land use sources to the …

Power System Planning In Developing Countries - The Case Of Jordan., Hafez El-Zayyat, Zainel-Abideen Tahboub, Fawwaz El-Karmi

Mansoura Engineering Journal

This paper deals with power system planning in developing countries. Several features of power system planning in developing countries are presented. These show that the planning process varies with the degree of assimilation of technology by society in general, and by planners and decision makers in particular, as well as the degree of economic growth, sound economic management, adoption of appropriate policies and degree of social development. The problems encountered by power system planners in developing countries are discussed in the first part of the paper. The second part is allotted to a detailed description of the Jordanian case as …

On Line Algorithm For Line Overload Alleviation., K. Yassin, E. Abd-Raboh, E. Towfik

Mansoura Engineering Journal

This paper presents an algorithm to be used in an energy control center to alleviate transmission lines overloads, either by line switching or busbar splitting. The method is applied to the 220 kv network of northern Egypt power system. The results achived proves the efficiency of such algorithm. Moreover, a comparison is carried out between the proposed algorithm in this paper and the generation shift approach.

Computer Control In Power Systems., E. Abd-Raboh, A. Ibrahim

Mansoura Engineering Journal

This paper is concerned with the new applications of on line/off line computers in modern power systems. In this paper, computer control from the power stations to the substation and transmission is extended. A new technique using a new topology description is developed. This technique has the facilities of describing topology connections, states, proparties as well as the optimal process of power stations. A program is constructed and used for performing the system interlocking. The Egyptian 500kv substation is checked by the proposed technique and its prospective program. The on-line interlocking is found to have less computation time than the …

Output Feedback Stabilization Of Discrete Systems., Hisham Soliman

Mansoura Engineering Journal

An algorithm is presented to solve the problem of stabilizing linear time invariant dincrete systems using output feedback. The algorithm is based on transforming the problem into a functional, a derived sufficient condition for stability, to be minimized using nonlinear optimization techniques. An illustrative example is given to support theoretical investigations.

Converging-Diverging Duct Heat Transfer And Hydrodynamic Resistance For Turbulent Water Flow., M. Awad, M. Shalaby, S. El-Shazly

Mansoura Engineering Journal

No abstract provided.

Solution Of Parapolic Navier-Stokes Equations For Laminar Forced Convective Flow In Entrance Region Of A Flat Passage., Mohamed Wasel

Mansoura Engineering Journal

Due to dependence of forced convective heat transfer on the hydrodynamic flow field; any improvement on the analysis of this flow field is of great importance to understand the heat transfer process. In this work the flow field is described by the parabolic Navier-Stokes equations; which are solved by local non-similarity solution-method. According to this method; with suitable definition of the problem variables, a set of ordinary differential equations are produced. This set is solved, numerically, by Runge-Kutta method accompanied with shooting method of boundary value problems. The values of local Nusselt number and local coefficient of friction are calculated …

Analysis Of Transient Heat Conduction In A 2-D Rectangular Fin., Mohamed Mahgoub

Mansoura Engineering Journal

In this work a new developed dimensionless finite difference technique for 2-D transient heat conduction is developed and presented. The technique is then applied to predict the time development of temperature profiles in a convectively cooled rectangular fin. In addition, a corrected analytical form that reduces the 2-D problem to a 1-D one is developed. Results prove that the numerical technique is simple and fast, while the 1-D reduced analytical solution is valid only for early time, small Biot number, and thin fins.

Stastical Analysis Of Some Loom Parameters Affecting Yarn Stops On Air Jet Loom., Mahmoud Salama

Mansoura Engineering Journal

In this work, the factorial design technique was used to investigate the influence of some loom parameter on the yarn stops during weaving on air jet loom. These parameter are the timing of harnesses crossing, machine speed and position of back beam. The statistical analysis showed that the warp and weft stops are signficantly affected by these parameters. The interaction between these parameter had a large influence on the yarn stops. The analysis of yarn stops was done on picanol and Tsudokoma air jet looms for comparison.

Librarians As Academics In Nigerian Universities: Revisiting The Quest For Justification And Matters Arising, Goodluck Ifijeh, Felicia Yusuf Dr, Sola Owolabi

Library Philosophy and Practice (e-journal)

The quest for librarians to be given their rightful place as academics in Nigerian Universities prompted this paper. From a comparative viewpoint, the need for librarians to enjoy the same rights and privileges as lecturers was highlighted. The paper provided ample justifications for granting librarians academic status in Nigerian Universities. It also discussed matters arising from the implementation of the National Universities Commission’s directive on the academic status of librarians. The paper proposed the systematic implementation of PhD Qualification for librarians, review of librarians’ cadres vis-à-vis those of lecturers and the need for the Librarians’ Registration Council of Nigeria (LRCN) …

Measuring Research Performance Of 19th Century British Era Universities Of Indian Subcontinent, Imran Hussain, Abid Iqbal, Vaseem Jaweed, Yasir Javed, Shakil Ahmad

Library Philosophy and Practice (e-journal)

Objectives: This study aims to evaluate the research productivity of universities established by the British rulers during the 19^th century in un-divided Indian sub-continent. Another objective of the study is to explore the collaboration patterns and to perform impact analysis on the research produced by the studied universities.

Methods: Bibliometric method was used to perform this analysis on the data retrieved from Scopus database. Research yield of studied universities in the form of bibliographic records of research publications was the sample of this study.

Results: Chemistry was the most published subject area in the studied universities. Researchers in the …

The Use Of Isbared/Ishaped And Elimination Of Reviewing Patients’ Chart Before Handoff To Decrease Incremental Overtime, Sheila Bucao

Master's Projects and Capstones

Problem: Incremental overtime was found to majorly impact the financial well-being of a stroke unit. From an allocated budget of 22 hours per pay period, the unit’s incremental overtime averaged 40 hours. The stroke unit had skilled-mix competencies, further complicating handoffs. The absence of a standard reporting method means that reviewing patients’ charts takes approximately 10 to 15 minutes, extending what should be a quick, but thorough nurse knowledge exchange.

Context: The body of evidence reviewed indicated that pertinent information to patient care is not left out or missed when a standardized tool is used during handoff. Based on Lean …

Efficient Crispr/Cas9 Mutagenesis For Neurobehavioral Screening In Adult Zebrafish, Dana Shaw, Mayssa Mokalled

Open Access Publications

Adult zebrafish are widely used to interrogate mechanisms of disease development and tissue regeneration. Yet, the prospect of large-scale genetics in adult zebrafish has traditionally faced a host of biological and technical challenges, including inaccessibility of adult tissues to high-throughput phenotyping and the spatial and technical demands of adult husbandry. Here, we describe an experimental pipeline that combines high-efficiency CRISPR/Cas9 mutagenesis with functional phenotypic screening to identify genes required for spinal cord repair in adult zebrafish. Using CRISPR/Cas9 dual-guide ribonucleic proteins, we show selective and combinatorial mutagenesis of 17 genes at 28 target sites with efficiencies exceeding 85% in adult …

Interdependence With Our Most Forgetful Elders: Alzheimer's In The Anthropocene, Christine Heller

Electronic Theses and Dissertations

This dissertation uses autoethnography and critical psychological and philosophical theories to explore what people with Alzheimer’s disease teach us about being, forgetting, and dying in the Anthropocene. The author collected personal memory data from her lived experience of being with her mother while she had Alzheimer’s disease, and organized these memories into a series of vignettes. Each vignette was analyzed with critical psychological and philosophical theories to illuminate intersubjective themes of denial, things, ancestors, place, dying, and time. These themes connected the personal to the epochal and articulated the wisdom that our most forgetful elders can share in the Anthropocene, …

Towards A "Universal Chemical Biology Toolbox" For Tackling Human Diseases, Christopher Swank

Electronic Theses and Dissertations

A lack of new drug targets and drug mechanisms, coupled with drug-pipeline attrition, represent significant problems in oncology drug discovery. Towards addressing this challenge, “fully-functionalized small-molecule probes” (FFSMPs) have been established, which are compounds that can be immediately used as “bait” to capture their protein targets under the same assay conditions used for oncology-based phenotypic screening. Specifically, each FFSMP library member contains one or more structural-diversity elements to promote interactions of the probe with different protein targets in living cells, an electrophile or photoreactive functional group for covalent attachment of the probe to interacting proteins via affinity or photoaffinity labeling, …

Triangle Journal, Volume 2, Number 11

Triangle Journal, 2006-2009

Editor: Rebekah Hart. Layout: Andie Espinoza. Editorial Review Board: Will Batts, James Cox, Jamie Griffin, Herb Zeman. Contributors: Vincent Astor, Anthony Childress, Terry Cox, Kent Hamson, Herschel Stokes, Casey Williams, Andrea Zucker Photography. Office Facilities: Holy Trinity Community Church. National Advertising: Rivendell Media

Special thanks to Rhodes College and the Paul Barret Jr. Library for providing initial scanning of this collection.

Knowledge Sharing Among Staffs For Elderly And People With Disabilities Service At National Library Of The Republic Of Indonesia, Nisrina Fairus Widiasmara, Kiki Fauziah

Library Philosophy and Practice (e-journal)

This study discusses the knowledge sharing activities among the library staffs for Elderly and Disability Service at National Library in Indonesia. The aim of this research is to obtain an overview of knowledge sharing activities conducted by the library staffs for Elderly and Disability Service using seven aspects of knowledge sharing. The research approach used is qualitative with case study method. The data collection method includes observation, interview, and document analysis. The results of the study indicate that there are no substantial differences in some aspects of knowledge sharing between the library staffs who do not have special needs and …

Exploring The Impact Of The Achievement Gap On Shame And Resilience In African American College Students, Brittany R. Thomas

Electronic Theses and Dissertations

The achievement gap refers to the stark difference that occurs between racial or gender groups, as one group performs significantly higher than the other. An achievement gap has the propensity to produce psychological distress, as well as buffering techniques that are necessary for survival and success. Growing research shows that African American college students experience unique levels of trauma, shame, hardship, macro, and micro-aggressions, suggesting that these students learn to self-preserve as early as 10 years old. This study used a Pearson correlation, Independent T-Test, and a Moderated Multiple Regression to explore the impact of the achievement gap on shame …

Tracking The Amide I And Αcoo− Terminal Ν(C=O) Raman Bands In A Family Of L-Glutamic Acid-Containing Peptide Fragments: A Raman And Dft Study, Ashley E. Williams, Nathan I. Hammer, Ryan C. Fortenberry, Dana N. Reinemann

Faculty and Student Publications

The E-hook of β-tubulin plays instrumental roles in cytoskeletal regulation and function. The last six C-terminal residues of the βII isotype, a peptide of amino acid sequence EGEDEA, extend from the microtubule surface and have eluded characterization with classic X-ray crystallographic techniques. The band position of the characteristic amide I vibration of small peptide fragments is heavily dependent on the length of the peptide chain, the extent of intramolecular hydrogen bonding, and the overall polarity of the fragment. The dependence of the E residue’s amide I ν(C=O) and the αCOO− terminal ν(C=O) bands on the neighboring side chain, the length …