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Fundamental buckling of circular plates with elastically restrained edges and resting on concentric rigid ring support

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Frontiers of Mechanical Engineering 2013年第3期8卷 291-297页

作者： Lokavarapu Bhaskara rao Chellapilla Kameswara rao School of Mechanical and Building Sciences VIT UniversityVandalur-Kelambakkam RoadChennai 600127Tamil NaduIndia Department of Mechanical Engineering Guru Nanak Institutions Technical CampusIbrahimpatnamHyderabad 501506A.PIndia

This work presents the existence of buckling mode switching with respect to the radius of concentric rigid ring *** buckling mode may not be axisymmetric as previously *** general,the plate may buckle in an axisymmetric mode but when the radius of the ring support becomes small,the plate may buckle in an asymmetric *** optimum radius of the concentric rigid ring support for maximum buckling load is also *** internal rigid ring support,when placed at an optimal position increases the elastic buckling load capacity by 149.39 *** numerical results obtained are in good agreement with the previously published data.

关键词： buckling circular plate elastically restrained edge rigid ring support mode switching

Integral Self-affine Tiles of Bandt's Model

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Acta Mathematicae Applicatae Sinica 2010年第1期26卷 169-176页

作者： Hui rao Li-jun Zhang Department of Mathematics and Statistics Central China Normal University Wuhan 430079 China Department of Mathematics Tsinghua University Beijing 100084 China

Integral self-affine tiling of Bandt＇s model is a generalization of the integral self-affine tiling. Using ergodic theory, we show that the Lebesgue measure of the tile is a rational number where the denominator equa... 详细信息

关键词： IFS self-affine tiling invariant measure _

Development of STEP AP224 Extractor for Interfacing Feature Based CAPP to STEP-NC(AP238)

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International Journal of Automation and computing 2019年第5期16卷 655-670页

作者： Deepanshu Srivastava Venkateswara rao Komma Department of Mechanical Engineering Motilal Nehru National Institute of Technology

Manufacturing features represent area of interest on the machinable surface of a part, which can provide a unique set of removable volumes from part. Feature description in standard for exchange of product(STEP) AP224 is an efficient neutral format for the development of feature based process planning. Process planning information of features can be converted to numerical control(NC)code to have complete manufacturing information of part. STEP-NC code provides an efficient manufacturing information model compared to G-M codes. In this work, an interface is developed for extraction of feature information available in AP224(AIM) format and the ruled-based approach is used to select different process planning parameters. A graphical user interface(GUI) is developed for the interface for displaying features information as represented in AP224 file. Furthermore, the interface generates STEP-NC code in AP238 format. The developed interface has three modules. 1) Module I: Reading interface for STEP AP224 file and development of GUI. 2)Module II: Selection of feature based process planning parameters. 3) Module III: Writing interface for STEP-NC(AP238). The developed interface has been implemented in Java through Java standard data access interface(JSDAITM). The generated STEP-NC AP238 code for the test part has been successfully simulated on STEP-NC Machine TM, an AP238 simulator. This article also provides an in-depth view of application interpreted model(AIM) representation format of STEP for AP224 and AP238.

关键词： Standard for exchange of product (STEP) AP224 AP238 Java standard data access interface (JSDAITM) computer aided design(CAD)/computer aided process planning(CAPP)/computer aided manufacturing(CAM)

Xception-Fractalnet:Hybrid Deep Learning Based Multi-Class Classification of Alzheimer’s Disease

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Computers, Materials & Continua 2023年第3期74卷 6909-6932页

作者： Mudiyala Aparna Battula Srinivasa rao School of Computer Science and Engineering VIT-AP UniversityAndhra Pradesh522237India

Neurological disorders such as Alzheimer’s disease(AD)are very challenging to treat due to their sensitivity,technical challenges during surgery,and high *** complexity of the brain structures makes it difficult to distinguish between the various brain tissues and categorize AD using conventional classification ***,conventional approaches take a lot of time and might not always be ***,a suitable classification framework with brain imaging may produce more accurate findings for early diagnosis of *** in this paper,an effective hybrid Xception and Fractalnet-based deep learning framework are implemented to classify the stages of AD into five ***,a network based on Unet++is built to segment the tissues of the ***,using the segmented tissue components as input,the Xception-based deep learning technique is employed to extract high-level ***,the optimized Fractalnet framework is used to categorize the disease condition using the acquired *** proposed strategy is tested on the Alzheimer’s Disease Neuroimaging Initiative(ADNI)dataset that accurately segments brain tissues with a 98.45%of dice similarity coefficient(DSC).Additionally,for themulticlass classification of AD,the suggested technique obtains an accuracy of 99.06%.Moreover,ANOVA statistical analysis is also used to evaluate if the groups are significant or *** findings show that the suggested model outperforms various stateof-the-art methods in terms of several performance metrics.

关键词： Fractalnet deep learning xception unet++ alzheimer’s disease magnetic resonance imaging

Photometric study of W UMa type binaries in the intermediate open cluster NGC 7789

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Research in Astronomy and Astrophysics 2010年第2期10卷 159-165页

作者： Kandulapati Sriram Pasagada Vivekananda rao Department of Astronomy Osmania University

The light curve solutions of two W UMa binary systems in the intermediate open cluster NGC 7789 are presented in this paper. These variables were observed using the 2 m telescope of the IUCAA-Girawali Observatory. The V passband photo- metric solutions of the two W UMa binaries were obtained using the latest version of the W-D program. The result shows that both systems are H-subtype W UMa binaries with high mass ratios.

关键词： binaries: eclipsing- binaries: close

Natural history of Barrett's esophagus

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World Journal of Gastroenterology 2012年第27期18卷 3483-3491页

作者： rao Milind Stephen E Attwood Department of Surgery North Tyneside General HospitalNorth ShieldsTyne and Wear NE29 8NHUnited Kingdom

The natural history of Barrett's esophagus (BE) is difficult to quantify because,by definition,it should describe the course of the condition if left ***,we assume that patients with BE will receive symptomatic treatment with acid suppression,usually a proton pump inhibitor,to treat their *** paper describes the development of complications of stricture,ulcer,dysplasia and adenocarcinoma from this *** over the definition of BE and its implications in clinical practice are *** presence of intestinal metaplasia and its relevance to cancer risk is discussed,and the need to measure the extent of the Barrett's epithelium (long and short segments) using the Prague guidelines is *** and international consensus over the diagnosis and management of BE are being regularly *** need for expert consensus is important due to the lack of randomized trials in this *** searching the literature,we have tried to collate the important studies regarding progression of Barrett's to dysplasia and *** therapeutic studies yet reported show a clear reduction in the development of cancer in *** effect of pharmacological and surgical intervention on the natural history of Barrett's is a subject of ongoing research,including the Barrett's Oesophagus Surveillance Study and the aspirin and esomeprazole cancer chemoprevention trial with interesting *** geographical variation and the wide range of outcomes highlight the difficulty of providing an individualized risk profile to patients with *** studies on the interaction of genome wide abnormalities in Barrett's and their interaction with environmental factors may allow individualization of the risk of cancer developing in BE.

关键词： Barrett's esophagus Columnar lined esoph-agus Dysplasia Adenocarcinoma Gastroesophagealreflux Surgery

Exact Boundary Synchronization for a Coupled System of Wave Equations with Neumann Boundary Controls

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Chinese Annals of Mathematics,Series B 2018年第2期39卷 233-252页

作者： Tatsien LI Xing LU Bopeng rao Dedicated to Philippe G. Ciarlet on the occasion of his 80th birthda

In this paper, for a coupled system of wave equations with iNeumann boundary controls, the exact boundary synchronization is taken into consideration. Results are then extended to the case of synchronization by groups. Moreover, the determination of the state of synchronization by groups is discussed with details for the synchronization and for the synchronization by 3-groups, respectively.

关键词： Exact boundary synchronization, Exact boundary synchronization bygroups State of synchronization, State of synchronization by groups Coupled system of wave equations, Neumann boundary control

A new mixed-mode phase-field model for crack propagation of brittle rock

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第5期15卷 1186-1199页

作者： Qiuhua rao Chenchen Zhao Wei yi School of Civil Engineering Central South UniversityChangsha410083China

Study on crack propagation process of brittle rock is of most significance for cracking-arrest design and cracking-network optimization in rock ***-field model(PFM)has advantages of simplicity and high convergence over the common numerical methods(*** element method,discrete element method,and particle manifold method)in dealing with three-dimensional and multicrack ***,current PFMs are mainly used to simulate mode-I(tensile)crack propagation but difficult to effectively simulate mode-II(shear)crack *** this paper,a new mixed-mode PFM is established to simulate both mode-I and mode-II crack propagation of brittle rock by distinguishing the volumetric elastic strain energy and deviatoric elastic strain energy in the total elastic strain energy and considering the effect of compressive stress on mode-II crack *** solution method of the new mixed-mode PFM is proposed based on the staggered solution method with self-programmed subroutines UMAT and HETVAL of ABAQUS *** examples calculated using different PFMs as well as test results are presented for *** results show that compared with the conventional PFM(which only simulates the tensile wing crack but not mode-II crack propagation)and the modified mixed-mode PFM(which has difficulty in simulating the shear anti-wing crack),the new mixed-mode PFM can successfully simulate the whole trajectories of mixed-mode crack propagation(including the tensile wing crack,shear secondary crack,and shear anti-wing crack)and mode-II crack propagation,which are close to the test *** can be further extended to simulate multicrack propagation of anisotropic rock under multi-field coupling loads.

关键词： New mixed-mode phase-field model(PFM) Mode-I and mode-II crack propagation Volumetric strain energy Deviatoric elastic strain energy Compressive stress Brittle rock

On the Synchronizable System

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Chinese Annals of Mathematics,Series B 2020年第6期41卷 821-828页

作者： Zhen LEI Tatsien LI Bopeng rao School of Mathematical Sciences Fudan UniversityShanghai 200433China Shanghai Key Laboratory for Contemporary Applied Mathematics Nonlinear Mathematical Modeling and Methods Laboratory Institut de Recherche Mathematique Avancee Universite de Strasbourg67084 StrasbourgFrance

In this paper,the synchronizable system is defined and studied for a coupled system of wave equations with the same wave speed or with different wave speeds.

关键词： Synchronizable system Synchronization solution Coupled system of wave equations Exact boundary synchronization