2011
Journal
I.F =
Research
Title
Authors
Affiliation
Faculty of Industrial Education
International Journal of Automotive Technology, Vol. 12, No. 6, pp. 787-794 (2011)
COMBUSTON INSTABILITIES AND NANOPARTICLES EMISSON FLUCTUAYIONS IN
GDI SPARK IGNITION ENGINEE
A. E. Hassaneen¹, S.Samuel² and I. Whelan³
Department of Automotive Technology, Helwan University, Cairo, Egypt
School of Technology, Oxford Brookes University, OX33 lHX, U
Abstract:
The main challenge facing the concept of gasoline direct injection is the unfavourable physical
conditions at which the premixed charge is prepared and burned. These conditions include the short
time available for gasoline to be sprayed, evaporated, and homogeneously mixed with air. These
conditions most probably affect the combustion process and the cycle-by-cycle variation and may be
reflected in overall engine operation. The aim of this research is to analyze the combustion
characteristics and cycle-by-cycle variation including engine-out nanoparticulates of a turbocharged,
gasoline direct injected spark ignition (DISI) engine at a wide range of operating conditions. Gasoline
DISI, turbo-intercooled, 1.6L cylinder engine has been used in the study. In-cylinder pressure has
been measured using spark plug mounted piezoelectric transducer along with a PC based data
acquisition. A single zone heat release model has been used to analyze the in-cylinder pressure data.
The analysis of the combustion characteristics includes the flame development (0-10% burned mass
fraction) and rapid burn (10-90% burned mass fraction) durations at different engine conditions. The
cycle-by-cycle variations have been characterized by the coefficient of variations (COV) in the peak
cylinder pressure, the indicated mean effective pressure (lMEP), bum durations, and particle number
density. The combustion characteristics and cyclic variability of the DISI engine are compared with
data from throttle body injected (TBI) engine and conclusions are developed.
Key words
DISI engine, Cyclic variability, Combustion characteristics, Nanoparticulates
2011
Journal
I.F =0.844
Research Title
Authors
Affiliation
Faculty of Industrial Education
Applied Physics Letters/ Volume 97/ Issue 19/ ORGANIC ELECTRONICS AND
PHOTONICS
OPTICAL SECOND HARMONIC GENERATION AT HETEROJUNCTION
INTERFACES OF A MOLYBDENUM TRIOXIDE LAYER AND AN ORGANIC LAYER
A. B. El Basaty¹,² Y. Miyauchi,¹ G. Mizutani ¹ , T. Matsushima¹, and H. Murata¹
1School of Materials Science, Japan Advanced Institute of Science and Technology
(JAIST), Ishikawa 923-1292, Japan
2Department of Physics, Faculty of Science, Helwan University, Cairo 11795, Egypt
Abstract
We have observed optical second harmonic generation (SHG) from a space charge layer (SCL) in a
stacked indium tin oxide (ITO)/molybdenum trioxide (MoO3)/N−N′-diphenyl-N−N′-bis(1-naphthly)1,1′-biphenyl-4,4′-diamine (α-NPD) system. When the MoO3 thicknesses were increased, the SHG
signals from this system decreased sharply at smaller MoO3 thicknesses, and were saturated at MoO3
thicknesses larger than 1 nm. These results prove the vital role of SCL in improvement of drive
voltages of organic light-emitting diodes
Key words
2011
Journal
I.F =0.844
Research Title
Authors
Affiliation
Faculty of Industrial Education
Heat Mass Transfer (2011) 47:211-221
HEAT TRANSFER CHARACTERISTICS FROM ANARRAY OF THIN STRIPS PIN
FINS DUE TO THEIR EXPOSURES TO A SINGLE DOWNWARD JET
IMPINGEMENT
Eldesouki I. Eid. Abdalla G. Gomaa •
Mohamed E. Gomaa
E. I. Eid
Mechanical Department, Faculty of Industrial Education,
Suez Canal University, Suez, Egypt
e-mail: eldesukieidrsiyahoo.com
A. G. Gomaa
Refrigeration and Air Conditioning Department.
Faculty of Industrial Education, Helwan University, Cairo. Egypt
1. E. Gomaa
Technology Department, The Specialized Studies Academy,
Workers University, Ismailia, Egypt
Abstract
This paper investigates the heat transfer characteristics from thin strips pin fins due to their
exposure to a single circular downward air jet impingement. Five aluminum specimens were
considered; each one has a rectangular base of 84 mm x 78 mm and it has an array of about 300 thin
strips pin fins. A test rig consists mainly of air compressor; nozzle and protractor mechanism was
setup. Experiments were done to find out the effects of attack angle, Reynolds number, nozzle-totarget spacing, lateral pitch and parallel pitch among the fins on the heat transfer characteristics.
Empirical correlations were deduced to describe the experimental data. A CFD-numerical model was
introduced to monitor the now characteristics on a scale of more details than that possible in the
experimental work. The comparison among the results of the present work and those by the
literature shows about 50% improvement in heat transfer characteristics rather than the single jet
impingement onto flat plates, cylindrical surfaces, ribbed walls and multiple jets impingement onto
flat plates.
Key words
2011
Journal
I.F =0.844
Research Title
Authors
Affiliation
Faculty of Industrial Education
Boundary Value Problems 2011, 2011:45 doi:10.1186/1687-2770-2011-45
THE EQUICONVERGENCE OF THE EIGENFUNCTION EXPANSION FOR
ASINGULAR VERSION OF ONEDIMENSIONAL SCHRODINGER OPERATOR
WITH EXPLOSIVE FACTOR
Zaki FA EI-Raheem ¹ and AH Nasser ²
1 Department of Mathematics, Faculty of Education, Alexandria University,
Alexandria, Egypt
2 Faculty of Industrial Education, Helwan University, Cairo, Egypt
Abstract
This paper is devoted to prove the equiconvergence formula of the eigenfunction expansion for some
version of Schrodinger operator with explosive factor. The analysis relies on asymptotic calculation
and complex integration. The paper is of great interest for the community working in the area.
Key words
Eigenfunctions, Asymptotic formula, Contour integration,
Equiconvergence
2011
Journal
I.F =0.844
Research Title
Authors
Affiliation
Faculty of Industrial Education
Hindawi Publishing Corporation
Abstract and Applied Analysis
THE EIGENFUNCTION EXPANSION A DIRICHLAT PROBLEM WITH EXPLOSIVE
FACTOR
Zaki F. A. EI-Raheem1 and A. H. Nasser2
1 Department of Ma thenui tics, Faculty of Education, Alexandria University,
Alexanderia 21526, Egypt
2 Department of Mathematics, Faculty of Industria! Education, Heliuan University,
Cairo, Egypt
Abstract
The solutions of many problems of mathematical physics are reduced to the spectral investigation of
a differential operator or finding the expansion of arbitrary function, in series or integration, in terms
of the eigenfunctions of a differential operator. The differential operator is called regular if it its
domain is finite and its coefficients are continuous; otherwise it is called singular differential
operator. The Sturm-Liouville theory occupies a central position of the spectral theory of regular
operator. During the development of quantum mechanics, there was an increase in the interest of
spectral theory of singular operator on which we will restrict our attention. The first basic role in the
development of spectral theory of singular operator dates back to E. Ch. Tetchmarsh [1]. He gave a
new approach in the spectral theory of singular differential operator of the second order by using
contour integration. Also Levitan [2] gave a new method; he obtained the eigenfunction expansion in
infinite interval by taking limit of a regular case. In the last time about twenty five or so years, due to
the needs of mathematical physics, in particular, quantum mechanics, the question of solving various
spectral problems with explosive factor has been arisen. These appeared' also in the study of
geophysics and electromagnetic field, see Alemov [3]. The spectral theory of differential operators
with explosive factor is studied by A. N. Tekhanov, M. G. Krien, M. G. Gasimov, and others. In this
paper, we find the eigenfunction expansion formula and prove its convergence for following
Key words
2011
Journal
I.F =0.844
Research Title
Authors
Affiliation
Faculty of Industrial Education
Energy 36 (2011) 2788-2795
EXPERIMENTAL INVESTIGATION OF A VAPOR COMPRESSION HEAT PUMP
USED FOR A COOLING, AND HEATING PPLICATIONS
M. Fatouh, E. Elgendy
Mechanical Power Engineering Department. Faculcy of Engineering at EIMatroria. P.D.11718 (Masaken EI-Helmia). Cairo. Egypt
Abstract
The present work aims at evaluating the performance characteristics of a vapor compression heat
pump (VCHP)for simultaneous space cooling (summer air conditioning) and hot water supply. In
order to achieve this objective, a test facility was developed and experiments were performed over a
wide range of evaporator water inlet temperature (14:26QC)and condenser water inlet temperature
(22:34 QC). R134awas used as a primary working fluid whereas water was adopted as a secondary
heat transfer fluid at both heat source (evaporator) and heat sink (condenser) of the heat pump.
Performance characteristics of the considered heat pump were characterized by outlet water
temperatures, water side capacities and coefficient of performance (COP)for various operating modes
namely: cooling, heating and simultaneous cooling and heating. Results showed that COP increases
with the evaporator water inlet temperature while decreases as the condenser water inlet
temperature increases. However, the evaporator water inlet temperature has more effect on the
performance characteristics of the heat pump than that of condenser water inlet temperature. Actual
COP of cooling mode between 1.9to 3.1 and that of heating mode from 2.9 to 3.3 were obtained.
Actual simultaneous COP between 3.7 and 4.9 was achieved.
Key words