Faculty of Science
http://dspace.bethlehem.edu:8080/xmlui/handle/123456789/38
Faculty of Science2024-03-28T17:24:15ZCollection and Identi cation Of Microservices Patterns And Antipatterns
http://dspace.bethlehem.edu:8080/xmlui/handle/123456789/168
Collection and Identi cation Of Microservices Patterns And Antipatterns
Tighilt, Ra fik; Abdellatif, Manel; Abu Saad, Nader; Moha, Naouel; Gu eh eneuc, Yann-Ga el
2021-01-01T00:00:00ZAerodynamic Performance of Advanced Ingenuity and Dragonfly Drones for Future Space Missions to Mars and Titan
http://dspace.bethlehem.edu:8080/xmlui/handle/123456789/159
Aerodynamic Performance of Advanced Ingenuity and Dragonfly Drones for Future Space Missions to Mars and Titan
Ata, Osama
The future of space missions to habitable Mars and Saturnian moon; Titan, is very promising to mankind as far as sending coaxial rotorcrafts or dual-quadcopter landers, to fly in their atmospheric extremes, are concerned. The aerodynamic performance of Martian Ingenuity is compared to that on Titan and Earth. Advanced design features of Ingenuity are further explored and analyzed that resulted in added benefits of increased hover time, range with a payload of about 28% of its gross weight. The enhanced performance of the advanced design would move its role from a helicopter demonstrator to a helicopter assistant of a landed rover with exploration and excavation tasks to perform in dune caves and volcano craters. Further, the performance of a dual-quadcopter lander; Titanean Dragonfly, is explored and compared to that on Earth. The relatively denser atmosphere and lower gravitational acceleration offer favorable flying conditions for rotorcrafts that can save on power consumption if the equipment is further fortified against the extremely cold temperature on Titan
2021-01-01T00:00:00ZDesign of a Novel Split-Bowtie Slotted Multi- Resonant Antenna
http://dspace.bethlehem.edu:8080/xmlui/handle/123456789/158
Design of a Novel Split-Bowtie Slotted Multi- Resonant Antenna
Ata, Osama; Jawadeh, Mutaz
This article demonstrates a novel design of a splitbowtie
slotted multi-resonant antenna. The design process
was inspired from previous research of integrating a slot of
a similar profile to the outer boundary of a rectangular
patch antenna. The followed approach presents steps of
proposed antenna evolution, which starts with a bowtieshape
slotted antenna and a coaxial feed to a final design
with a split-bowtie-shaped slot, and a double transmission
line feed. Polar dimensions of the outer boundary (radii and
angle) and slot profiles together with the dimensions of the
feed, whether coaxial or transmission line, were considered
as parameters for optimization. Four antennas were
accordingly studied, which led to the final split-bowtieshaped
antenna IV. These designs were performed utilizing
a special simulation package called “CST Microwave Suite”
that included the optimizer “Genetic Algorithm”. The final
design offers 4 simultaneous bands from a single splitbowtie-
shaped slot; a big advantage of unnecessary
integration of a set of complicated slots on front and ground
planes. Further, the antenna finds applications in mobile
GSM and LTE bands 900/1800 MHz and 2.1 GHz, together
with the satellite communications band 1.25 GHz. It is
therefore simple, non-reconfigurable, easy to fabricate,
designed on a single copper layer, with a low cost FR4
substrate and a plane copper ground.
2022-07-01T00:00:00ZDetermination of Minerals, Total Phenolic Content, Flavonoids, Antioxidants and Antimicrobial Activities of Ethanolic Extract of Sweet Lupinus angustifolius of Palestine
http://dspace.bethlehem.edu:8080/xmlui/handle/123456789/157
Determination of Minerals, Total Phenolic Content, Flavonoids, Antioxidants and Antimicrobial Activities of Ethanolic Extract of Sweet Lupinus angustifolius of Palestine
Hanania, Michel; Radwan, Sireen; Abu Odeh, Suhair; Qumber, Abeer
Aims: To establish the most suitable extraction method for sweet lupine seeds and to determine
minerals, phenolic content, flavonoids, antioxidant activity and antimicrobial activities.
Study Design: Known and standard experimental procedures are employed.
Place and Duration of Study: Department of Chemistry, Bethlehem University- Palestine, from
January 2019 to March 2019.
Methodology: Seeds were ground and extracted by Soxhlet extractor using ethanol with different
percentages (50%, 60%, 70%, 80% and 95%). Sodium, potassium and ferrous ion content were
determined. Resistance to bacteria was performed against Escherichia coli and Staphylococcus
aureus, while antioxidant activity was determined by FRAP method. Two types of flavonoids were
measured: Flavonones and dihydroflavonols via the reaction with 2,4-dinitrophenylhydrazine.
Phenolics were determined by the Folin-Ciocalteu method.
Results: 50% ethanol resulted in the highest extract residue (18.6%) while 70% and 60% showed
the lowest content (10.0% for both). 80% ethanol extracted sample showed the highest content for
sodium (56.51 mg Na/g extract), while 60% and 50% ethanol extracts showed the highest content
of potassium (2.25 and 2.33 mg K/g extract, respectively). The maximum concentration of ferrous
ion was obtained with 70% ethanol (6.854 mg Fe+2/g extract). 95% ethanolic extract showed the
highest antioxidant activity (20.24 mg FeSO4/g extract). Similar results were obtained for total
phenolic content and flavonoids: 24.60 mg gallic acid/g extract for phenolics and 116.02 mg rutin/g
extract for flavonoids. Extracts showed no bacterial activity against both types of bacteria used.
Conclusion: 95% ethanol extracted samples showed the highest antioxidant activity and the
highest flavonoids and phenolic content. Sweet lupine extract did not perform any antimicrobial
activity against both Gram positive and Gram negative bacteria.
2019-05-14T00:00:00Z