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Hybrid High‑Order Methods for the Acoustic Wave Equation in the Time Domain

Communications on Applied Mathematics and Computation 2022年第2期4卷 597-633页

作者： Erik Burman omar duran Alexandre Ern Department of Mathematics University College LondonLondon WC1E 6BTUK CERMICS Ecole des Ponts77455 Marne la Vallée Cedex 2France INRIA Paris 75589 ParisFrance

We devise hybrid high-order(HHO)methods for the acoustic wave equation in the time *** frst consider the second-order formulation in *** the Newmark scheme for the temporal discretization,we show that the resulting HHO-Newmark scheme is energy-conservative,and this scheme is also amenable to static condensation at each time *** then consider the formulation of the acoustic wave equation as a frst-order system together with singly-diagonally implicit and explicit Runge-Kutta(SDIRK and ERK)***-SDIRK schemes are amenable to static condensation at each time *** HHO-ERK schemes,the use of the mixed-order formulation,where the polynomial degree of the cell unknowns is one order higher than that of the face unknowns,is key to beneft from the explicit structure of the *** results on test cases with analytical solutions show that the methods can deliver optimal convergence rates for smooth solutions of order O(hk+1)in the H1-norm and of order O(h^(k+2))in the L^(2)-***,test cases on wave propagation in heterogeneous media indicate the benefts of using high-order methods.

关键词： Hybrid high-order methods Wave equation Newmark scheme Runge-Kutta scheme

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Sea Cucumber(Isostichopus *** badionotus)Dry-Salting Protocol Design

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Natural Resources 2017年第3期8卷 278-289页

作者： Oliver Arias Hernandez Edgardo Alcendra Pabon omar Jose Carreno Montoya Eduardo Cabrera duran Ruby Olga Corvacho Narvaez Adriana Rodriguez Forero Grupo de Investigacion y Desarrollo Tecnologico en Acuicultura Facultad de IngenieriasUniversidad del MagdalenaSanta MartaColombia

Sea cucumbers are common foods in Asian culture. They are commonly eaten as dry-salted. Thus, a dry-salting protocol for cucumbers includes the processes of: gutting, cooking, salting, drying and packing. Drying trials were conducted at 50℃ and 60℃ in an oven and air-dried, with no difference (P > 0.05) in yield observed between them. Protein content varied depending on the type of drying, while fat content did not change significantly (P > 0.05). Final yield ranged between 5% to 7% of initial mass, with the main losses in mass (due to water loss) registered in the gutting and cooking stages. The sea cucumbers dried in an oven at 60℃ reached the humidity goal faster and there were statistically significant differences (P Isostichopus sp. aff badionotus is for consumers a viable alternative source of protein.

关键词： Sea Cucumber Drying Curves Protein Protocol Temperature

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Management of Complex Wounds with Dermal Substitute Assisted by a Negative Pressure System

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Modern Plastic Surgery 2023年第4期13卷 95-105页

作者： Cuahutémoc Márquez Espriella Ruiz Garza Jorge Gerardo Barbosa Villarreal Fernando Dávila Díaz Rodrigo Cuervo Vergara Marco Antonio Campollo López Ana Priscila Gutierrez Alvarez Mauricio Chama Naranjo Alfredo García Corral Jesús Ricardo Pérez Benítez omar Alberto Pulido López Ricardo Alberto Jaimes duran Edwing Michel Garibaldi Bernot Mauro Cortes Aguilar Carlos Manuel García Córdova Carlos Emiliano Camacho Rodriguez Hayah Camacho Rodriguez Hayah Martinez Villalobos Claudia Nallely Ochoa Contreras Erick Cesar Randall Cruz Soto Herrera Lozano Luis Arturo Department of Plastic and Reconstructive Surgery Hospital Central Sur Petróleos Mexicanos Mexico City Mexico

Introduction: The standard treatment for complex wound care is autografting. The advent of dermal substitutes has provided a novel tool for the preparation of the bed to be grafted. However, most types of dermal matrices require the application of a skin graft a second time. Currently, other strategies have been developed to improve the vascularization process, such as negative pressure wound therapy (NPWT), which has been reported to reduce the time required for vascular growth and dermal matrix integration and thus achieve a shorter waiting period for autologous graft application. The present study aims to evaluate the effectiveness and safety of dermal matrix management associated with NPWT in the treatment of complex wounds. Methods: Seven patients with a diagnosis of complex wounds were enrolled in this study between July 1, 2015, and June 31, 2016. After debridement and having an adequate wound bed, patients who met the criteria for the application of combined therapy were treated with dermal substitutes and a negative pressure system. The percentage of graft integration into the wound bed, complications, length of hospital stay, and duration of therapy were analyzed. Results: The mean age was 42.5 ± 16 (39 - 54) years old;three women and four men were included in the study. The approximate size of skin loss was 120.7 ± 75 cm2 (25 - 250 cm2). The combined therapy of dermal matrix plus NPWT was instituted in all cases for a period of 14 days. There were no complications, with 100% graft integration in 6 of 7 cases. Patients were discharged after a mean hospital stay of 5.4 days. Conclusions: This study demonstrates that the utilization of combined dermal matrix plus NPWT therapy can be performed safely and effectively in patients with complex wounds with low complication rates and a short hospital stay.

关键词： Negative Pressure Wound Therapy Complex Wound Dermal Matrix Wound Therapy

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Epidemiology of Fingertip Injuries at South Central Hospital Petróleos Mexicanos “Pemex” with a Review of the Literature

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Journal of Biosciences and Medicines 2023年第6期11卷 182-195页

作者： Fernando Barbosa-Villarreal Cuahutémoc Márquez-Espriella Erika Barlandas-Quintana Ana Priscila Campollo-López Mauricio Gutiérrez-Álvarez Carlos Emiliano García-Córdova Jesús Ricardo García-Corral Alfredo Chama-Naranjo Ricardo Alberto Pulido-López Patricia Llizette López-Medellín Edgar Alan Guillen-Martínez Jonathan Steve Rodríguez-Alaníz Edwing Michel Jaimes-duran Carlos Manuel Cortes-Aguilar Mauro Garibaldi-Bernot omar Alberto Pérez-Benítez Miguel Eduardo Marín-Canto Luis Arturo Herrera-Lozano Héctor Manuel Suarez-Ortega Alejandro Cruz-Zarate Department of Plastic and Reconstructive Surgery Hospital Central Sur Petróleos Mexicanos Mexico City Mexico

Background: The hand is an essential component for performing our daily tasks;as a result, injuries to the fingertip are frequently seen. Accurate evaluation and treatment of fingertip injuries are essential to avoiding long-term disability, job loss and psychological issues. No matter the injury classification system, maintaining finger length, regaining sensation, and improving appearance are the three main objectives of treatment. The objective of this research was to outline the epidemiology of fingertip injuries treated between 2021 and 2022 at a highly specialized referral hospital in Mexico City. Methodology: This investigation is cross-sectional, retrospective, and observational. From January 2021 to December 2022, 60 patients with a diagnosis of fingertip injury from the South Central Hospital “Pemex” were included. The descriptive statistical analysis was performed using SPSS29. Results: 60 patients were included, 27 (45%) were women and 33 (55%) were men. Allen’s classification was able to classify only 19 patients, of which 18 (94.7%) had a type 1 classification and one (5.26%) had a type 2 classification. 10% of patients experienced complications, which included 2 patients with surgical site infections (3.3%), 3 patients with persistent pain (5%), and 1 patient (1.6%) with graft rejection. Conclusions: There are currently insufficient epidemiological data on hand and wrist injuries and its effects on labor in Mexico. Fingertip injuries require particular care in order to prevent complications and long-term damage. The creation of national registries could help with the creation of reference manuals for the care of hand and wrist injuries in our nation.

关键词： Fingertip Fingertip Injuries Epidemiology

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