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Numerical modelling of reinforced concrete flexural members strengthened using textile reinforced mortars

Frontiers of structural and Civil Engineering 2023年第4期17卷 649-668页

作者： Naveen Revanna Charles k.s.Moy Department of Civil Engineering Xi’an Jiaotong-Liverpool UniversitySuzhou 215123China

Externally bonded(EB)and near-surface mounted(NsM)bonding are two widely adopted and researched strengthening methods for reinforced-concrete *** composite substrates are easy to reach and repair using appropriate surface treatments,whereas NsM techniques can be easily applied to the soffit and concrete member *** EB bonded fiber-reinforced polymer(FRP)technique has a significant drawback:combustibility,which calls for external protective agents,and textile reinforced mortar(TRM),a class of EB composites that is noncombustible and provides a similar functionality to any EB FRP-strengthened *** study employs a finite element analysis technique to investigate the failing failure of carbon textile reinforced mortar(CTRM)-strengthened reinforced concrete *** principal objective of this numerical study was to develop a finite element model and validate a set of experimental data in existing literature.A set of seven beams was modelled and calibrated to obtain concrete damage plasticity(CDP)*** predicted results,which were in the form of load versus deflection,load versus rebar strain,tensile damage,and compressive damage patterns,were in good agreement with the experimental ***,a parametric study was conducted to verify the applicability of the numerical model and study various influencing factors such as the concrete strength,internal reinforcement,textile roving spacing,and externally-applied load *** ultimate load and deflection of the predicted finite element results had a coefficient of variation(COV)of 6.02%and 5.7%,respectively.A strain-based numerical comparison with known methods was then conducted to investigate the debonding *** developed finite element model can be applied and tailored further to explore similar TRM-strengthened beams undergoing debonding,and the preventive measures can be sought to avoid premature debonding.

关键词： fiber reinforced polymer textile reinforced mortar finite element analysis concrete damage plasticity calibration and validation parametric study

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Focal epithelial hyperplasia in a human immuno-deficiency virus patient treated with laser surgery

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World Journal of Clinical Cases 2014年第7期2卷 293-296页

作者： Alexandros Galanakis Gaspare Palaia Gianluca Tenore Alessandro Del vecchio Umberto Romeo Department of Oral and Maxillofacial science Sapienza University of Rome00161 RomeItaly

Focal epithelial hyperplasia(FEH), or Heck's disease, is a rare disease of the oral mucosa; it is mostly found in children or young adults who are immunosuppressed and who live in regions with low socioeconomic status. It is characterized by asymptomatic papules on the oral mucosa, gingiva, tongue, and lips. Healing can be spontaneous, and treatment is indicated if there are aesthetic or functional complications. Human papillomavirus, especially genotypes 13 and 32, has been associated with FEH and is detected in the majority of lesions. Histopathologically, FEH is characterized by parakeratosis, epithelial hyperplasia, focal acanthosis, and fusion and horizontal outgrowth of epithelial ridges. A 37-year-old male patient was referred to the Department of Oral and Maxillofacial sciences at the sapienza University of Rome, complaining of numerous exophytic lesions in his mouth. He stated that the lesions were not painful but he had experienced occasional bleeding after incidental masticatory trauma. He had received no previous treatment for the oral lesions. His medical history revealed that he was human immuno-deficiencyvirus positive and was a smoker with numerous, asymptomatic oral papules clinically and histologically corresponding to FEH. The labial and buccal mucosa were especially affected by lesions. surgical treatment was performed using a 532-nm potassium titanyl phosphate laser(smartLite, Deka, Florence, Italy) in continuous mode with a 300 μm fiber and power of 1.4 W(power density 1980.22 W/cm2). After anesthesia without vasoconstrictors, the lesions were tractioned with sutures or an Allis clamp and then completely excised. The lesions were preserved in 10% formalin for histological examination, which confirmed the clinical diagnosis of FEH. In this case, the laser allowed excellent control of bleeding, without postoperative sutures, and optimal wound healing.

关键词： Lasers Focal epithelial hyperplasia Mouth Human immunodeficiency virus Oral pathology

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Therapeutic methods for diarrhea in children

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World Journal of Gastroenterology 2000年第4期6卷 497-500页

作者： s.k. Bhattacharya Director National Institute of Cholera and Enteric DiseasesP-33CIT Road.Scheme XMBeliaghataCalcutta 700010INDIA

DEFINITIONAcute diarrhoea is defined as passage of loose or waterystools at least three times in a 24 h *** loosestools contain blood,it is called bloody diarrhoea(dysentery).It is the consistency of the stools which ismost important rather than the ***-fed babiesoften pass'pasty'stools frequently which is not *** raother can often tell accurately whether child hasdiarrhoea or not.

关键词： diarrhea infantile/therapy dehydration antibiotics infusion intravenous water-electrolyte balance antidiarrheals nutritional requirements

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FINITE ELEMENT ANALYsIs OF A VERTICAL RECTANGULAR PLATE COUPLED WITH AN UNBOUNDED FLUID DOMAIN ON ONE sIDE UsING A TRUNCATED FAR BOUNDARY

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Journal of Hydrodynamics 2009年第2期21卷 190-200页

作者： PANI P. k. BHATTACHARYYA s. k. Civil Engineering Department IGIT Sarang Orissa 759146 India Civil Engineering Department IIT Kharagpur 721302 India

The dynamic pressure distribution on a rectangular plate attached to a rigid wall and supporting an infinitely large extent of fluid subjected to a harmonic ground excitation is evaluated in the time domain. Governing equations for the fluid domain are set considering the compressibility of the fluid with negligibly small change in density and a linearized free surface. A far boundary condition for the three-dimensional fluid domain is developed so that the far boundary is truncated at a closer proximity to the structure. The coupled problem is solved independently for the structure and the fluid domain by transferring the acceleration of the plate to the fluid and pressure of the fluid to the plate in sequence. Helmholtz equation for the three-dimensional fluid domain and Mindlin＇s theory for the two-dimensional plate are used for the solution of the interacting domains. Finite element technique is adopted for the solution of this problem with pressure as nodal variable for the fluid domain and displacement for the plate. The time dependent equations are solved in each of the interacting domain using Newmark-fl method. The effectiveness of the technique is demonstrated and the influences of surface wave, exciting frequency and flexibility of the plate on dynamic pressure are investigated.

关键词： fluid-structure interaction compressible fluid linear surface wave truncation boundary dynamic pressure

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VRs-DB:preserve confidentiality of users'data using encryption approach

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Digital Communications and Networks 2021年第1期7卷 62-71页

作者： J.s.Rauthan k.s.Vaisla Department of Computer and science Engineering Uttarakhand Technical UniversityDehradunUttarakhand248007India

We focus on security and privacy problems within a cloud database framework,exploiting the DataBase as a service(DBaas).In this framework,an information proprietor drives out its information to a cloud database professional *** Data-Owner(DO)encrypts the delicate information before transmission at the cloud database professional company end to offer information *** encryption ideas,nonetheless,are just halfway homomorphic as all of them intend to enable an explicit kind of calculation,which is accomplished on scrambled *** current plans can't be coordinated to solve genuine functional queries that include activities of various *** propose and evaluate a Verifiable Reliable secure-DataBase(VRs-DB)framework on shared tables along with many primary operations on scrambled information,which enables information interoperability,and permits an extensive possibility of structured Query Language(sQL)queries to be prepared by the service provider on the encoded *** show that our security and privacy idea is protected from two forms of threats and are fundamentally proficient.

关键词： Privacy security Cloud storage Encrypted query Cryptography sensitive data

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Non-alcoholic fatty liver disease may not be a severe disease at presentation among Asian Indians

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World Journal of Gastroenterology 2006年第21期12卷 3400-3405页

作者： kaushal Madan Yogesh Batra s Datta Gupta Bal Chander k D Anand Rajan M s Tewatia s k Panda s k Acharya Department of Gastroenterology All India Institute of Medical sciences New DelhiIndia Department of Gastroenterology All India Institute of Medical sciences New DelhiIndia Department of PathologyAll India Institute of Medical SciencesNew DelhiIndia Department of Pathology All India Institute of Medical sciences New DelhiIndia

AIM： To evaluate the clinical and biochemical profile of patients with non alcoholic fatty liver disease （NAFLD） and to assess their histological severity at ***： Consecutive patients presenting to the liver clinic of All India Institute of Medical sciences （AIIMs） with raised transaminases to at least 1.5 times upper limit of normal, and histologically confirmed non-alcoholic fatty liver disease were included. Patients who had significant alcohol intake or positive markers of other liver diseases or who were taking drugs known to produce fatty liver were excluded. The clinical, biochemical and histological profile of this group was studied. REsULTs： Fifty-one patients with NAFLD formed the study population. Their median age and BMI were 34（17-58） years and 26.7（21.3-32.5） kg/m^2 respectively and 46 （90.1%） were males. The majority of the patients had mild inflammation, either grade 1 [32 （63%）] or grade 2 [16 （31%）] and only 3 （6%） patients had severe （grade 3） inflammation. Twenty-three （45%）, 19 （37%）, 8（16%） and 1（2%） patient had stage 0, 1, 2 and 3 fibrosis respectively on index biopsy and none had cirrhosis. On univariate analysis, triglyceride levels more than 150 mg % （OR = 7.1; 95% CI： 1.6-31.5, P = 0.002） and AsT ALT ratio 〉 1 （OR = 14.3; 95% CI： 1.4-678.5, P = 0.008） were associated with high grades of inflammation and none was associated with advanced fibrosis. On multivariate logistic regression analysis, hypertriglyceridemia 〉150 mg% was the only factor independently associated with presence of high grade of inflammation （OR = 1.6; 95% CI： 1.3-22.7, P =0.02）, while none was associated with advanced fibrosis. Triglyceride levels correlated positively with inflammatory grade （r = 0.412; P = 0.003）. CONCLUsION： NAFLD in North Indian patients is a disease of young over-weight males, most of whom are insulin resistant and they tend to have a mild histological disease at presentation.

关键词： Inflammation Fibrosis Triglycerides Non alcoholic steatohepatitis

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Deformation heterogeneity of Ti under cryogenic channel-die compression

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Progress in Natural science:Materials International 2011年第4期21卷 277-285页

作者： k.H.kIM s.k.HWANG Division of Materials science and Engineering Inha University

Commercial purity Ti was subjected to channel die compression in liquid nitrogen for the purpose of studying its deformation characteristics from the viewpoint of the grain refinement induced by severe plastic *** specimens showed microstructural heterogeneity in that the initial blocky grains of about 50 urn in size turned into a mixture of the easily deforming soft grains and the hard grains revealing local concentration of dislocations and deformation *** electron back scattered diffraction analysis the in-grain misorientation-axis distribution was studied,from which it was found that the deformation heterogeneity resulted from the anisotropy of individual grains with respect to the compression die:while the soft grains were those oriented favorably for the prismslip,the hard ones were oriented for non-prism slips and deformation *** difference in the response of individual grains,therefore,led to a remarkable effect of the crystal texture of specimens on the maximum strain that can be imposed on specimens without *** on the present results,a way to achieve expedient grain refinement through the cryogenic plane-strain compression was suggested.

关键词： titanium cryogenic deformation texture microstructure

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Modeling the Contemporary stress Field and Deformation Pattern of Eastern Mediterranean

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Journal of Earth science 2010年第4期21卷 365-381页

作者： s k Dwivedi D Hayashi simulation Tectonics Laboratory Faculty of ScienceUniversity of the Ryukyus

The contemporary stress field in the earth＇s crust is important and provides insights into mechanisms that drive plate motions. In this study, elastic plane stress finite element modeling incorporating realistic rock parameters was used to calculate the stress field, displacement field, and defor- mation of the plate interactions in the eastern Mediterranean. Modeled stress data for the African- Arabian-Anatolian plate interactions with fixed European platform correlate well with observed contemporary stress indicator from the world stress map （WsM） and focal mechanism of earthquakes; while displacement field agrees qualitatively well with GPs vectors and sense of motion indicated by focal mechanisms for large crustal earthquakes （Ms〉6） and plate motion models. Modeling result shows the direction of maximum horizontal compressive stress （σHmax） toward the direction of absolute motion of these plates. Large perturbations in σHmax orientations are shown to occur in and around tectonic boundaries between those plates. It is observed that, although the African plate acts mostly as indenter, which transmits the collisional motion from the Arabian plate to the Anatolian plate, in the current situation, the far-field stress, probably from the subduction in Aegean Arc, is needed to satisfy the contemporary stress field in Anatolia.

关键词： finite element model maximum horizontal stress seismieity crustal deformation Anatolia eastern Mediterranean.

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A Two-Temperature supernova Fallback Disk Model for Anomalous X-ray Pulsars

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Chinese Journal of Astronomy and Astrophysics 2002年第2期2卷 161-168页

作者： YeLu k.s.Cheng NationalAstronomicalObservatories ChineseAcademyofSciencesBeijing100012 DepartmentofPhysics UniversityofHongKongHongKongChina

We present a case study of the relevance of the radially pulsational instability of a two-temperature accretion disk around a neutron star to anomalous X-ray pulsars (AXPs). Our estimates are based on the approximation that such a neutron star disk with mass in the range of 10-6-10-5 M⊙ is formed by supernova fallback. We derive several peculiar properties of the accretion disk instability: a narrow interval of X-ray pulse periods; lower X-ray luminosities; a period derivative and an evolution time scale. All these results are in good agreement with the observations of the AXPs.

关键词： pulsars: general ─pulsars ─stars: neutron ─X-rays: stars─ accretion disk─instability

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Integrated numerical model for vegetated surface and saturated subsurface flow interaction

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Applied Mathematics and Mechanics(English Edition) 2012年第7期33卷 881-898页

作者： k. s. ERDURAN Department of Civil Engineering Faculty of Engineering University of Nigde Department of Civil Engineering College of Engineering American University of Sharjah

The construction of an integrated numerical model is presented in this paper to deal with the interactions between vegetated surface and saturated subsurface flows. A numerical model is built by integrating the previously developed quasi-three-dimensional （Q3D） vegetated surface flow model with a two-dimensional （2D） saturated groundwater flow model. The vegetated surface flow model is constructed by coupling the explicit finite volume solution of 2D shallow water equations （sWEs） with the implicit finite difference solution of Navier-stokes equations （NsEs） for vertical velocity distribution. The subsurface model is based on the explicit finite volume solution of 2D saturated groundwater flow equations （sGFEs）. The ground and vegetated surface water interaction is achieved by introducing source-sink terms into the continuity equations. Two solutions are tightly coupled in a single code. The integrated model is applied to four test cases, and the results are satisfactory.

关键词： vegetated surface flow saturated groundwater flow flow interaction tightcoupling finite volume method finite difference method flow resistance

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