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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.
Amina KhatunEmail author,Mahmudur Rahman,Khaza Nur Uddin,Kamrul Ahsan,Sabequn Nahar Shimu,Khadejatul Kobra,Shamme Akter Shimu,Wahidul Haque,Tobibur Rahman,Tangila Hoque Jessy,Farzana Akhter 경희대학교 융합한의과학연구소 2016 Oriental Pharmacy and Experimental Medicine Vol.31 No.4
Traditional medicinal practitioners or Kavirajes use a variety of medicinal plants for treatment of thrombus ailments-cardiovascular problems. In this study, thrombolytic activity of 36 extracts of different solvents of eight Bangladeshi medicinal plants traditionally used in cardiovascular problems were evaluated to justify their use in folklore medicinal practitice. Extraction was conceded using methanol. Five grams of the concentrated methanol extract of each crude extract were then fractionated to provide n-hexane and carbon tetrachloride fractions. Phytochemically important groups like reducing sugars, tannins, saponins, steroids, gums, flavonoids and alkaloids were tested using standard chromogenic reagents. In vitro thrombolytic potential of extracts was assayed for analyzing the clot lyses by adding the extracts to the pre-clotted blood. The results were compared with the results obtained from streptokinase as standard and water as a negative control. Thrombolytic effect of the extracts ranged from 0.73 ± 2.44 % to 45.81 ± 0.34 % clot lysis whereas the standard streptokinase showed 65.13 ± 0.96 % and the negative control water showed 2.50 ± 0.67 % clot lysis. The highest thrombolytic effect was shown by the crude extract of Melastoma malabathricum leaves and the lowest by the CCl4 fractionate of Litsea glutinosa leaves. Most of the results were found relevant to the traditional use of the plants. Plants traditionally used in thrombus ailments may be an interesting source for further drug development.
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.
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.
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.
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.
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.
Amina Irakoze(아미나 이라코제),Seok So-I(석소이),Kwanho Lee(이관호),Kee Han Kim(김기한) 대한건축학회 2022 대한건축학회 학술발표대회 논문집 Vol.42 No.2
An effective energy upgradation of existing building stock requires classification of buildings based on their thermal characteristics. The purpose of this study is to classify buildings with similar envelop thermal characteristics by applying k-means clustering analysis on building energy consumption data of different granularity (hourly, daily, and monthly energy). Heating energy consumption from 51 building models with varying wall, window, and roof thermal transmittance, window SHGC, and infiltration rate (ac/h) is used. The findings of this study indicate that building classifications obtained from hourly, daily, and monthly heating energy differ especially in the identification of buildings with high window thermal transmittance and infiltration rate.