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Three-dimensional acoustic propagation model for shallow waters based on an indirect boundary element method

Chinese Physics B 2023年第5期32卷 485-495页

作者： edmundo f.lavia Juan D.Gonzalez Silvia Blanc Acoustic Propagation Department Argentinian Navy Research Office(DIIV)Buenos Aires 1638Argentina UNIDEf(National Council of Scientific and Technical Research/Ministry of Defense) Buenos AiresArgentina

This work has a two-fold *** the one hand,the theoretical formulation of a three-dimensional(3D)acoustic propagation model for shallow waters with a constant sound speed is presented,based on the boundary element method(BEM),which uses a half-space Green function instead of the more conventional free-space Green *** the other hand,a numerical implementation is illustrated to explore the formulation in simple idealized cases,controlled by a few parameters,which provides necessary tests for the accuracy and performance of the *** half-space Green's function,which has been previously used in scattering and diffraction,adds terms to the usual expressions of the integral operators without altering their continuity *** against the wavenumber integration solution of the Pekeris waveguide suggest that the model allows an adequate prediction for the acoustic ***,numerical experiments in relation to the necessary mesh size for the description of the water-marine sediment interface lead to the conclusion that a transmission loss prediction with acceptable accuracy can be obtained with the use of a limited mesh around the desired evaluation region.

关键词： three-dimensional acoustic propagation boundary element method half-space Green function

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Paediatric retinal detachment:a review

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International Journal of Ophthalmology(English edition) 2017年第10期10卷 1592-1603页

作者： Raffaele Nuzzi Carlo lavia Roberta Spinetta Eye Clinic Department of Surgical SciencesUniversity of Turin

Paediatric retinal detachment（PRD）is an uncommon and challenging disease;it differs from adult detachments in etiology,anatomical characteristics,management and *** can be particularly challenging,even for the most expert paediatric surgeons due to the higher prevalence of total retinal detachments,late diagnosis and bilateral involvement with respect to those which occur in ***,the anatomical success,when achieved,is frequently not related to a functional *** adverse events,refractive errors and amblyopia may additionally undermine the final *** to date there are few reviews regarding the approach of retinal detachment in children,mainly dealing with rhegmatogenous retinal *** this review,rhegmatogenous,retinopathy of prematurityrelated and Coats’-related PRDs were *** available literature from the last decades were reviewed and ***,etiology and clinical presentation,together with therapeutic approaches and outcomes have been reviewed and discussed.

关键词： paediatric retinal detachment paediatric rhegmatogenous retinal detachment retinopathy of prematurity Coats' disease

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Telehealth Combined with Differentiated ART Delivery Improves ART Pick Up during COVID 19 at a Large HIV Treatment facility in Trinidad and Tobago

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World Journal of AIDS 2021年第2期11卷 50-59页

作者： N. Lyons W. Samaroo francis J. Edwards O. lavia Medical Research foundation Trinidad and Tobago

Objective: To describe the implementation and outcomes of using telehealth in combination with a differentiated ART delivery model to improve HIV antiretroviral therapy pick up at a large treatment facility in Trinidad and Tobago during COVID-19. Design and Methods: Beginning in April 2020, a list of patients was generated daily prior to their scheduled ART appointments. Nurses, doctors and social workers conducted telephone consultations to first screen patients for COVID-19 symptoms, conducted brief medical and behavioural health screenings, and helped patients to identify barriers to ART retention. Patients were recommended for 1) fast track ART refill collection at facility, 2) community ART refills, and 3) ART pick-up through patient peers. The uptake and outcomes of telehealth and ART pick up were compared with the corresponding period in 2019. Data was analyzed using SPSS 21.0. Results: During the period April-June 2020, 1361 patients were identified for telephone consultations, 1084 (80%) were successfully contacted and 984 patients (88%) participated in phone session. The independent t test showed a significant increase in ART pick-up when compared to the corresponding period in 2019. 59% of patients collected via fast-track ART refill, 30% had community refills, and 11% pick-up medications through patient peers. Conclusion: Telehealth is an integral component of DSD as part of the COVID-19 response at the MRf. Understanding the medium and longer-term outcomes of Telehealth can provide additional insights on the scale up of telehealth as a component of DSD to improve ART outcomes for patients in the context of the developing countries of the Caribbean.

关键词： HIV COVID 19 Telehealth Depression

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午夜旋律

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书城 2022年第9期 2-2页

作者： lavia Lin

倾听音乐如同一场浪漫的邂逅一相见,相知,相惜,相恋。音乐是一种无形但强大的艺术形式,聆听时,音乐注入你的身体,声音的艺术与你的情感和记忆融合。带着你进入一个幻想的世界,色彩随着旋律舞动,五彩的线条跟着节奏流动。画中是一个色彩...

倾听音乐如同一场浪漫的邂逅一相见,相知,相惜,相恋。音乐是一种无形但强大的艺术形式,聆听时,音乐注入你的身体,声音的艺术与你的情感和记忆融合。带着你进入一个幻想的世界,色彩随着旋律舞动,五彩的线条跟着节奏流动。画中是一个色彩舞动的世界,在这里,音乐是有形的,色彩是有声的。

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