Free vibration analysis of FG plates under thermal environment via a simple 4-unknown HSDT

Amina Attia,Amina Tahar Berrabah,Abdelmoumen Anis Bousahla,Fouad Bourada,Abdelouahed Tounsi,S. R. Mahmoud 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.6

A 4-unknown shear deformation theory is applied to investigate the vibration of functionally graded plates under thermal environment. The plate is fabricated from a functionally graded material mixed of ceramic and metal with continuously varying material properties through the plate thickness. Three types of thermal loadings, uniform, linear and nonlinear temperature rises along the plate thickness are taken into account. The present theory contains four unknown functions as against five or more in other higher order shear deformation theories. The through-the-thickness distributions of transverse shear stresses of the plate are considered to vary parabolically and vanish at upper and lower surfaces. The present model does not require any problem dependent shear correction factor. Analytical solutions for the free vibration analysis are derived based on Fourier series that satisfy the boundary conditions (Navier's method). Benchmark solutions are firstly considered to evaluate the accuracy of the proposed model. Comparisons with the solutions available in literature revealed the good capabilities of the present model for the simulations of vibration responses of FG plates. Some parametric studies are carried out for the frequency analysis by varying the volume fraction profile and the temperature distribution across the plate thickness.

Oral carcinoma cuniculatum, an unacquainted variant of oral squamous cell carcinoma: A systematic review

Amina Fouad Farag,Dalia Ali Abou-Alnour,Noha Saleh Abu-Taleb 대한영상치의학회 2018 Imaging Science in Dentistry Vol.48 No.4

Purpose: Oral carcinoma cuniculatum is a rare well-differentiated variant of oral squamous cell carcinoma. The purpose was to systematically review its unique features to differentiate it from other variants as verrucous carcinoma, papillary squamous cell carcinoma and well-differentiated squamous cell carcinoma. Materials and Methods: A systematic review was performed using MEDLINE, Dentistry and Oral Sciences Source and PubMed databases and any existing articles related to the research subject missed in the search strategy to screen ones reporting cases occurring exclusively in the oral cavity in English literature. Variables analyzed included clinical, etiologic, imaging, histopatholgical features, treatment, follow-up and survival rates. Results: From 229 hits, 17 articles with 43 cases were included in the systematic review. Clinically it showed a female predilection with pain and/or ulceration of a relatively long duration and exudation being the most common symptoms. Histologically, it showed more endophytic features comprising well-differentiated squamous epithelium with absent or minimal cytological atypia and multiple keratin filled crypts or cuniculus. Inflammatory stromal reaction and discharging abscesses were reported in most of the cases. Bone destruction was predominant in most imaging features. Complete surgical resection with a safety margin was the treatment of choice in most of the cases with few recorded recurrence cases. Conclusion: Apprehensive knowledge of oral carcinoma cuniculatum unique features is essential to avoid its misdiagnosis and provide proper treatment especially for recurrent cases.

Molecular characterization and in silico analysis of RNA polymerase alpha subunit gene (rpoA) in Date Palm (Phoenix dactylifera L.) cv. Deglet Nour

Amina Dhieb,Amine Elleuch,Walid Kriaa,Faiza Masmoudi,Nourredine Drira 한국유전학회 2012 Genes & Genomics Vol.34 No.6

The rpoA gene coding for the α-subunit of DNA-dependent RNA polymerase located in the chloroplastic genome of date palm has been characterized from the elite cultivar Deglet Nour by cloning and sequencing of the PCR amplification product. The full length of rpoA-Pd (Phoenix dactylifera)gene was 1014 bp. The comparison in Genbank showed that the rpoA gene has a 100% homology with the Khalas cultivar of date palm and a strong homology with Oil Palm (99%). The deduced protein full length is 337 amino acid corresponding to 38,692 Da polypeptide. It contained an Alpha N-terminal domain (alpha-NTD) between 1 to 233 (aa) and Alpha C-terminal domain (alpha-CTD) between 266 to 337 (aa). Initially, we have compared the sequences of the full-length DNA rpoA gene from Date Palm and Oil palm, 15 mutations have been detected, 4 do not affect amino acid sequences. A multiple alignment of protein sequences of Date Palm and other plants shows 6 mutations specific for palms family and one is specific to monocots species. A multiple alignment of 35 nucleotide sequences from different plant species shows 3 SNPs specific to Date Palm, 6 SNPs specific to Palms family and 6 other to monocot species. The phylogenetic analysis performed in this work shows a strong similarity between Pd-rpoA and rpoA genes from other plant species, but it shows a great divergence with the rpoA of E. coli. To explain whether the separation of the two clades was due to selection pressure. We calculate the ratio Ka/Ks for different species. A synteny analyses of rpoA genes was effected, a high genomic synteny is observed for the ropA in all the species included in this study.

The Evaluation of Ceiling Depth Impact on Lighting and Overall Energy Consumption of a Building with Top-lighting System

Amina Irakoze,Kee Han Ki,Lee Young-A 대한건축학회 2020 Architectural research Vol.22 No.1

The purpose of this study was to evaluate the variation in building energy predictions caused by simulation settings related to building envelop thickness. The study assessed the ceiling depth impact on skylight energy performance through OpenStudio integrated Radiance and EnergyPlus simulation programs. A ceiling as deep as 1.5 to 3m was analyzed for skylight to roof ratios from 1% to 25%. The results indicated that the building ceiling depth negatively affected the capability of skylights to significantly reduce building energy consumption. Through a parametric analysis, the study concluded that 8%, 9%, 10% and 11% skylight to roof ratio were optimal in terms of total building energy consumption for a ceiling depth of 1.5m, 2m, 2.5m and 3m, respectively. In addition, the results showed that the usually recommended 5% skylight to roof ratio was only efficient when no ceiling depth was included in the simulation model. Furthermore, the study indicated that the building energy saved by the optimal skylight of each ceiling depth decreased as the ceiling depth deepened. The highest total building energy reduction was 9%, 7%, 5% and 3% for a ceiling depth of 1.5m, 2m, 2.5m and 3m, respectively. This study induced that the solar heat gains and daylight visible transmittance by ceiling depth were crucial in the predictions of skylight energy performance and should not be neglected through building simulation simplifications as it is commonly done in most simulation programs’ settings.

From Localization to Globalization : Multi-language Services into 70 languages for Company L

Amina Matyakubova 한국EA학회 2018 한국EA학회 학술발표논문집 Vol.2018 No.12

The Evaluation of Ceiling Depth Impact on Lighting and Overall Energy Consumption of Building with Skylights

Amina Irakoze(아미나 이라코제),Kee Han Kim(김기한),Lee Young-A(이영아) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.2

This study aimed at the assessment of ceiling depth impact on skylight energy performance through OpenStudio integrated Radiance and EnergyPlus program. A ceiling as deep as 1.5 to 3m was analyzed for skylight to roof ratio from 1% to 25%. Through a parametric analysis, the study concluded that 8%, 9%, 10% and 11% skylight to roof ratio were optimal in terms of total building energy consumption for a ceiling depth of 1.5m, 2m, 2.5m and 3m respectively. In addition, the results showed that the usually recommended 5% skylight to roof ratio was only efficient when no ceiling depth was included in the simulation model. Therefore, study induced that ceiling depth was crucial in the analysis of skylight and should not be excluded for the simplicity of simulation model.

The Cherednik and the Gaussian Cherednik Windowed transforms on $\mathbb{R}^d$ in the W-invariant case

Amina Hassini,Khalifa Trimeche 강원경기수학회 2020 한국수학논문집 Vol.28 No.4

In this paper we give the harmonic analysis associated with the Cherednik operators, next we define and study the Cherednik wavelets and the Cherednik windowed transforms on $\mathbb{R}^d$, in the W-invariant case, and we prove for these transforms Plancherel and inversion formulas. As application we give these results for the Gaussian Cherednik wavelets and the Gaussian Cherednik windowed transform on $\mathbb{R}^d$ in the W-invariant case.

From Localization to Globalization: Multi-language Services into 70 languages for Company L

Amina Matyakubova 한국엔터프라이즈아키텍처학회 2019 정보기술아키텍처연구 Vol.16 No.S

Early reduced bone formation following burn injury in rats is not inversely related to marrow adiposity

Amina El Ayadi,Ron C. Helderman,Celeste C. Finnerty,David N. Herndon,Clifford J. Rosen,Gordon L. Klein 대한골다공증학회 2019 Osteoporosis and Sarcopenia Vol.5 No.3

Objectives: The objective of the study was to determine whether postburn reduction of bone formation occurred earlier than 2e3 weeks after burn injury and whether that reduction was inversely related to marrow adiposity. Methods: Using a rat model of burn injury with sacrifice at 3 days postburn, we measured serum osteocalcin, a biomarker of bone formation, as well as a regulator of glucose metabolism, and counted tibial marrow adipocytes. Results: Serum osteocalcin was reduced as early as 3 days postburn, coinciding with a trend toward decline in marrow adipocyte number rather than demonstrating an inverse relationship with adipocyte count. Conclusions: Factors that may be responsible for the dissociation include lack of circulating sclerostin, previously reported, increased energy demands following burn injury, increased sympathetic tone and perhaps oxidative stress. The relationship between bone formation and marrow adiposity is complex and subject to a variety of influences.

Removal of Cu (II) and Cd (II) Ions Onto Water Hyacinth Based Carbonaceous Materials

Amina, A. Attia,Shouman, Mona.A.,Khedr, S.A.,El-Nabarawy, Th. Korean Carbon Society 2006 Carbon Letters Vol.7 No.4

Treatment of water hyacinth with sulphuric acid produces carbonaceous materials that have been used to remove Cu(II) and Cd (II) ions from aqueous solutions. Untreated water hyacinth was also used for the subject of comparison. The textural properties of the carbonaceous materials were determined from nitrogen adsorption at 77 K. The optimum pH for the sorption of Cu (II) and Cd (II) ions on the investigated sorbents was determined. Dynamic adsorption measurements have been taken at 298 K whereas equilibrium measurements were carried out at 298, 313 and 323 K. The adsorption of nitrogen at 77 K on the untreated sample was too low and the surface areas of the treated samples 2, 3 and 4 were found between $70-208\;m^2/g$. The total pore volumes of these samples which were determined for the carbonaceous materials investigated were found to be 0.076-0.140 ml/g. The kinetic adsorption data of Cu (II) and Cd(II) were applicable to both pseudo - first and pseudo-second order but fit more the latter order. The equilibrium adsorption data were found to fit Freundlich and Langmiur equations. The values of DG, DH and DS are all negative indicating the feasibility and the spontaneous nature of the sorption of Cu (II) and Cd (II) ions by the sorbents investigated.