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RISS 인기검색어
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- 저자 : Alsolami, Saleh (검색결과 4 건)
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Two Leg Dual Inductor Hybrid Step-Up DC/DC Power Converter for Renewable Energy Resources
Allehyani Ahmed,Alsolami Mohammed 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.5
This paper proposes a new high gain DC/DC converter. The proposed converter achieves higher voltage-gain with reduced voltage-stress and lower duty cycle in comparison to similar topologies. The proposed converter is derived from the traditional dual inductor boost converter by adding two switched capacitor loops to the switch in the fi rst leg and the inductor in the second leg. Therefore, adding two more capacitors increases the output voltage gain of the converter. Detailed theoretical analysis, operation and a comparison with similar topologies are discussed. Moreover, experimental testing and verifi cation of a laboratory prototype is demonstrated
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Fracture resistance of CAD-CAM all-ceramic surveyed crowns with different occlusal rest seat designs
Chaturvedi, Saurabh,Alqahtani, Turki,Alsolami, Saleh,Alqahtani, Abdulbari,Das, Gotam,Alsubaiy, Ebrahim The Korean Academy of Prosthodonitics 2021 The Journal of Advanced Prosthodontics Vol.13 No.1
Purpose. To investigate the fracture resistance of monolithic CAD-CAM all-ceramic surveyed crowns with two different occlusal rest seat designs. Materials and Methods. Two maxillary first premolar were prepared for all-ceramic surveyed crowns with wide (2/3rd of buccolingual width of an unprepared tooth) or narrow (1/3rd of buccolingual width of an unprepared tooth) disto-occlusal rest seat (ORS) designs. Eighty monolithic CAD-CAM all-ceramic surveyed crowns were prepared and divided into 4 groups - Group CR, Composite resin material as a control; Group LDS, Lithium disilicate based material; Group ZIPS, zirconia-material (IPS ZirCAD); and Group ZLHT, zirconia- material (CeramillZolidht+). Crowns were cemented on an epoxy resin die with adhesive resin cement. The fracture resistance of crowns was tested with the universal machine. Univariate regression analysis was used. Results. The mean ± standard deviation of maximum failure force values varied from 3476.10 ± 285.97 N for the narrow ORS subgroup of group ZIPS to 687.89 ± 167.63 N for the wide ORS subgroup of group CR. The mean ± standard deviation of maximum force was 1075 ± 77.0 N for group CR, 1309.3 ± 283.9 N for group LDS, 3476.1 ± 285.97 N for group ZIPS, and 2666.7 ± 228.21 N for group ZLHT, with narrow occlusal rest seat design. The results of the intergroup comparison showed significant differences in fracture strength with various material groups and occlusal rest seat designs (P<.001). Conclusion. The zirconia-based all-ceramic surveyed crowns fractured at more than double the load of Lithium disilicate based crowns. The crowns with narrow base occlusal rest seat design had statistically significantly higher fracture resistance than surveyed crowns with wide occlusal rest seat design. The use of narrow occlusal rest seat design in CAD-CAM all ceramic surveyed crowns provides higher fracture resistance, and therefore narrow occlusal rest design can be used for providing esthetics with high strength.
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Audio Steganography Method Using Least Significant Bit (LSB) Encoding Technique
Alarood, Alaa Abdulsalm,Alghamdi, Ahmed Mohammed,Alzahrani, Ahmed Omar,Alzahrani, Abdulrahman,Alsolami, Eesa International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.7
MP3 is one of the most widely used file formats for encoding and representing audio data. One of the reasons for this popularity is their significant ability to reduce audio file sizes in comparison to other encoding techniques. Additionally, other reasons also include ease of implementation, its availability and good technical support. Steganography is the art of shielding the communication between two parties from the eyes of attackers. In steganography, a secret message in the form of a copyright mark, concealed communication, or serial number can be embedded in an innocuous file (e.g., computer code, video film, or audio recording), making it impossible for the wrong party to access the hidden message during the exchange of data. This paper describes a new steganography algorithm for encoding secret messages in MP3 audio files using an improved least significant bit (LSB) technique with high embedding capacity. Test results obtained shows that the efficiency of this technique is higher compared to other LSB techniques.
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Optical Properties of a Quantum Dot-Ring System Grown Using Droplet Epitaxy
Linares-Garcí,a, Gabriel,Meza-Montes, Lilia,Stinaff, Eric,Alsolamy, S. M.,Ware, M. E.,Mazur, Y. I.,Wang, Z. M.,Lee, Jihoon,Salamo, G. J. Springer US 2016 NANOSCALE RESEARCH LETTERS Vol.11 No.1
<P>Electronic and optical properties of InAs/GaAs nanostructures grown by the droplet epitaxy method are studied. Carrier states were determined by <B>k</B><B>·</B><B>p</B> theory including effects of strain and In gradient concentration for a model geometry. Wavefunctions are highly localized in the dots. Coulomb and exchange interactions are studied and we found the system is in the strong confinement regime. Microphotoluminescence spectra and lifetimes were calculated and compared with measurements performed on a set of quantum rings in a single sample. Some features of spectra are in good agreement.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1186/s11671-016-1518-2) contains supplementary material, which is available to authorized users.</P>
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