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Free vibration analysis of power-law and sigmoidal sandwich FG plates using refined zigzag theory
Aman Garg,Simmi Gupta,Hanuman D. Chalak,Mohamed-Ouejdi Belarbi,Abdelouahed Tounsi,Li Li,A.M. Zenkour Techno-Press 2023 Advances in materials research Vol.12 No.1
Free vibration analysis of power law and sigmoidal sandwich plates made up of functionally graded materials (FGMs) has been carried out using finite element based higher-order zigzag theory. The present model satisfies all-important conditions such as transverse shear stress-free conditions at the plate's top and bottom surface along with continuity condition for transverse stresses at the interface. A Nine-noded C0 finite element having eleven degrees of freedom per node is used during the study. The present model is free from the requirement of any penalty function or post-processing technique and hence is computationally efficient. The present model's effectiveness is demonstrated by comparing the present results with available results in the literature. Several new results have been proposed in the present work, which will serve as a benchmark for future works. It has been observed that the material variation law, power-law exponent, skew angle, and boundary condition of the plate widely determines the free vibration behavior of sandwich functionally graded (FG) plate.
Study of Junction Charge Transport Properties of Boron Subphthalocyanine Chloride Thin Film
Mandeep Singh,Aman Mahajan,Neeru Gupta,R. K. Bedi 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
The charge carrier transport properties and conduction mechanism ofboron subphthalocyanine chloride (Cl-BsubPc) thin film basedjunction was analyzed by using current-voltage (I-V) characteristicsand dielectric spectroscopy technique. I-V characteristic of ITO/Cl-BsubPc/Al junction confirmes the domination of space charge limitedconduction (SCLC) in the high voltage region (7 - 9 V). The ACconductivity study indicates the presence of frequency inducedhopping conduction mechanism in Cl-BsubPc thin film with hoppingrelaxation time of 16.6 - 4.1 ms. The temperature dependence of ACconductivity suggests that conduction in the films dominated byhopping of carriers between the localized states at low temperatureand movements of thermally excited carriers from energy levelswithin the band gap at higher temperature. The activation energy ofthe charge carriers responsible for conduction was found to liebetween 0.35 - 0.40 eV.
Dentofacial and Cranial Changes in Down Syndrome
Deepika Shukla,Deepika Bablani,Aman Chowdhry,Raveena Thapar,Puneet Gupta,Shashwat Mishra 질병관리본부 2014 Osong Public Health and Research Persptectives Vol.5 No.6
Objectives: This study aimed to determine the prevalence of certain oral characteristics usually associated with Down syndrome and to determine the oral health status of these patients. Methods: The cross-sectional study was conducted among patients attending a special education program at Faculty of Dentistry, Jamia Millia Islamia, Delhi, India. The study design consisted of closed-ended questions on demographic characteristics (age, sex, and education and income of parents), dietary habits, and oral hygiene habits. Clinical examination included assessment of oral hygiene according to Simplified Oral Hygiene Index (OHI-S), dental caries according to decayed, missing, and filled teeth (DMFT) index, periodontal status according to the Community Periodontal Index of Treatment Needs (CPITN), and malocclusion according to Angles classification of malocclusion. Examinations were carried out using a using a CPI probe and a mouth mirror in accordance with World Health Organization criteria and methods. Craniometric measurements, including maximum head length and head breadth were measured for each participant using Martin spreading calipers centered on standard anthropological methods. Results: The majority of the patients were males (n = 63; 82%) with age ranging from 6e40 years. The Intelligence Quotient (IQ) score of the patients indicated that 31% had moderate mental disability and 52% had mild mental disability. 22% exhibited hearing and speech problems.12% had missing teeth and 15% had retained deciduous teeth in adult population. The overall prevalence of dental caries in the study population was 78%. DMFT, CPITN and OHI scores of the study group were 3.8 ± 2.52, 2.10 ± 1.14 and 1.92 ± 0.63 respectively. The vast majority of patients required treatment (90%), primarily of scaling, root planing, and oral hygiene education. 16% of patients reported CPITN scores of 4 (deep pockets) requiring complex periodontal care. The prevalence of malocclusion was 97% predominantly of Class III malocclusions. Further 14% presented with fractured anterior teeth primarily central incisor. The percentage means of cephalic index was 84.6% in the study population. The brachycephalic and hyperbrachycephalic type of head shape was dominant in the Down syndrome individuals (90%). Conclusion: The most common dentofacial anomaly seen in these individuals was fissured tongue followed by macroglossia.