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The Impact of the Inclusion of MgO Nano-Fillers in a Polyethylene Matrix on Dielectric Strength and Resistance to Partial Discharges

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Open Journal of Applied Sciences 2024年第3期14卷 626-634页

作者： Virginie Griseri dominique Mary David Malec Eric David Laboratoire Plasma et Conversion d’énergie Université de Toulouse CNRS UPS INPT Route de Narbonne Toulouse France É cole de Technologie Supérieure de Montréal Rue Notre-Dame Ouest Montréal Canada

One commonly used strategy to enhance polymers specific properties such as the resistance to partial discharges erosion is the incorporation into the polymeric matrix of inorganic micro or nanoparticles. This study focused on the dielectric properties of Low-Density Polyethylene (LDPE) filled with nano-sized Magnesium Oxide (MgO) particles compounded by thermo-mechanical process and one of the purposes was to establish appropriate processing parameters in order to reach the desired dielectric properties. LDPE was used as a matrix and was reinforced by MgO particles having a nominal average size of 30 nm. The MgO nanoparticles were treated with a silane coupling agent (3-Glycidyloxypropyl Trimethoxysilane). The samples were initially prepared in a melt-mixing chamber with a MgO content of 1% wt. These pre-mixed samples were further treated by the means of thermo-mechanical mixing in a conical co-rotating twin-screw extruder in order to improve the dispersion and distribution of the MgO particles. In this report, both lifetime under a PD activity and AC dielectric strength of pure and nano-filled LDPE samples have been measured and compared. Nano-filled LDPE samples were found to exhibit an improve lifetime, without any detrimental impact on their short-term dielectric strength. This suggests that nano-filled LDPE may be for electric applications for which the dielectric materials may be exposed to partial discharge activities. This is significant result for the use of MgO-reinforced PE as an insulating material for HV cables since the resistance to PD is closely related to treeing resistance which is the main electrical degradation mechanism that leads to failure for shielded extruded power cables.

关键词： Low Density Polyethylene MgO Nanofillers Dielectric Strength Partial Discharges Resistance

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Finding biomarkers of experience in animals

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Journal of Animal Science and Biotechnology 2024年第3期15卷 925-944页

作者： Sarah Babington Alan J.Tilbrook Shane K.Maloney Jill N.Fernandes Tamsyn M.Crowley Luoyang Ding Archa H.Fox Song Zhang Elise A.Kho Daniel Cozzolino Timothy J.Mahony dominique Blache School of Agriculture and Environment The University of Western AustraliaCrawleyWA 6009Australia Centre for Animal Science The Queensland Alliance for Agriculture and Food InnovationThe University of QueenslandSt LuciaQLD 4072Australia School of Veterinary Science The University of QueenslandGattonQLD 4343Australia School of Human Sciences The University of Western AustraliaCrawleyWA 6009Australia School of Medicine Deakin UniversityGeelongVIC 3217Australia Poultry Hub Australia University of New EnglandArmidaleNSW 2350Australia College of Animal Science and Technology Yangzhou UniversityYangzhou 225009China Centre for Nutrition and Food Sciences The Queensland Alliance for Agriculture and Food InnovationThe University of QueenslandSt LuciaQLD 4072Australia

At a time when there is a growing public interest in animal welfare,it is critical to have objective means to assess the way that an animal experiences a *** is critical to ensure appropriate animal welfare *** behavioural,physiological,and neurobiological indicators that are used to assess animal welfare can verify the absence of extremely negative *** welfare is more than an absence of negative outcomes and an appropriate indicator should reflect the full spectrum of experience of an animal,from negative to *** this review,we draw from the knowledge of human biomedical science to propose a list of candidate biological markers(biomarkers)that should reflect the experiential state of non-human *** proposed biomarkers can be classified on their main function as endocrine,oxidative stress,non-coding molecular,and thermobiological *** also discuss practical challenges that must be addressed before any of these biomarkers can become useful to assess the experience of an animal in real-life.

关键词： Animal experience Animal welfare Biomarker Stress Welfare assessment

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Accidental Ingestion of Nitric Acid in an Agricultural Company: A Case Study and Literature Review

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Occupational Diseases and Environmental Medicine 2024年第1期12卷 21-27页

作者： Asséga Sylvain Sagna Mame Thioro Aïssatou Fall Mossane dominique Ndour Sidy Diallo Société de Cultures Légumières (SCL) Saint-Louis Sénégal West Africa Farms (WAF) Yamane Louga Sénégal International Committee of The Red Cross Dakar Sénégal Saint-Louis Regional Hospital Center Saint-Louis Sénégal

Introduction: Though common in society, caustic accidental ingestion is rare in the agricultural industry. This study describes a case of ingestion of nitric acid used as an agricultural fertilizer by an ordinary worker at the Société de Cultures Légumières. Clinical Case: This is a 33-year-old unschooled woman who ingested a sip of nitric acid from an abandoned labelled acid canister near a farming plot of land. She showed a burn of the oral cavity with a bleeding tablecloth and an intense retrosternal pain. The duodenal oesophagus fibroscopy screening that was carried out 18 hours after the accident, revealed an esophagitis class 2b. The tests revealed no anomalies. Fifteen (15) days after the accident, the FOGD was normal. Following an 8-month-follow up, no signs of stenosis or degeneration were noted. Conclusion: The accidental ingestion of nitric acid is rare in adult. Its treatment is mainly symptomatic and aims at preserving vital functions without directly fighting the ingested substance off. The right actions must be integrated into the 15-minute Health and Safety awarenesssessions for optimum pre-hospital management. The hospital evaluation is mandatory and is carried out thanks to the digestive endoscopy, which is still relevant in this indication, but is completed by the thoraco-abdominal CT. The latter is very sensitive the transmural necrosis diagnosis.

关键词： Accident Agriculture Caustic Fibroscopy Senegal

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Estimating the Input Power of a Power Plant Using the Efficiency of the Inverter

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Smart Grid and Renewable Energy 2024年第3期15卷 99-106页

作者： Toussaint Tilado Guingane Sosthène Tassembedo Eric Korsaga dominique Bonkoungou Zacharie Koalaga François Zougmore Physics UFR/SEA Materials and Environment Laboratory (LAME) Pr. Joseph Ki ZERBO University Ouagadougou Burkina Faso Physics UFR/ST Science and Technology Laboratory (LaST) Thomas SANKARA University Ouagadougou Burkina Faso

The study focuses on estimating the input power of a power plant from available data, using the theoretical inverter efficiency as the key parameter. The paper addresses the problem of missing data in power generation systems and proposes an approach based on the efficiency formula widely documented in the literature. In the absence of input data, this method makes it possible to estimate the plant’s input power using data extracted from the site, in particular that provided by the Ministry of the Environment. The importance of this study lies in the need to accurately determine the input power in order to assess the overall performance of the energy system.

关键词： Estimation Data Missing Input Power Efficiency Inverter

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Treatment of Synovial Cysts in Relation to the Tibial Tunnel of Anterior Cruciate Ligament Grafts by Filling the Tunnel with Acrylic Cement

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Surgical Science 2024年第4期15卷 289-298页

作者： Saint Luc Mungina Sedou Charlène Tshitala Mbombo Yannick Toko Kiama Kevin Ndangi Ezechiel Nkodia Dieudonné Mwangala Rossyl Kivudi dominique Saragaglia Luc Mokassa Bakumobatane Department of Surgery University Clinics of Kinshasa Faculty of Medicine University of Kinshasa Kinshasa Democratic Republic of Congo Matete General Reference Hospital Kinshasa Democratic Republic of Congo Department of Orthopedic Surgery Osteoarthritis Surgery and Sports Tromatology at the Grenoble Hospital and University Center Grenoble France National Border Hygiene Program Kinshasa Democratic Republic of Congo

Introduction: Synovial cyst of the tibial tunnel in connection with anterior cruciate ligament (ACL) reconstruction is a rare but particularly troublesome complication. Medical treatment is often doomed to failure, and surgical treatment usually consists of excising the cyst and filling the tunnel with bone. The aim of this study was to evaluate the results of filling the tunnel with acrylic cement. Hypothesis: Filling the tibial bone tunnel with acrylic cement should eliminate communication between the joint cavity and the pre-tibial surface and prevent cyst recurrence. Patients and Methods: This retrospective series is composed of 13 patients, 9 men and 4 women, mean age 48.5 years (31 to 64) operated on between 2011 and 2019 for an intra- and extraosseous synovial cyst consecutive to the tibial tunnel of an ACL graft. Between 1983 and 2016, 12 of the patients had had a bone graft without bone block fixation (DI-DT or Mac Intosh) and one patient, a bone-bone transplant (KJ). The cyst was of variable size, located on the anteromedial aspect of the proximal end of the tibia, and often painful, warranting consultation. At the time of the initial operation, 9 patients had undergone meniscectomies (6 medial, 2 lateral, 1 double). In 7 knees, there were 7 cartilage lesions in the femorotibial and/or patellofemoral compartments (one stage 1 lesion, 2 stage 2 lesions, 4 stage 3 lesions, and no stage 4 lesions). Only 2 knees had neither cartilage nor meniscus lesions. After curettage of the bone tunnel /− removal of the non-resorbed or PEEK interference screw, the tunnel was filled with acrylic cement /− reinforced with a ligament staple to prevent expulsion. All patients underwent regular follow-up consultations until recovery. Results: At a maximum follow-up of 8 years, only 1 cyst recurred, representing a 7.69% failure rate. It was reoperated with another technique, which involved filling the tibial bone tunnel with bone graft taken from a half-bank head. After recovery

关键词： Arthro-Synovial Cyst Tibial Tunnel ACL Graft Filling Acrylic Cement

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Granulometric and Mineralogical Characterization of the Sands of the Middle Course of the Kasai River (Territory of Ilebo, Province of Kasai/DR Congo)

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Journal of Geoscience and Environment Protection 2024年第7期12卷 50-71页

作者： Lowny Trésor Madienga Kitshabi Ivon Ndala Tshiwisa Modeste Kisangala Muke Thomas Kanika Mamena dominique Wetshondo Osomba Emmanuel Cibambula Musau Adalbert-Jules Makutu Ma Ngwayaya Department of Petroleum Exploration and Production Faculty of Oil Gas and Renewable Energies University of Kinshasa Kinshasa Democratic Republic of the Congo Department of Geosciences Faculty of Sciences and Technologies University of Kinshasa Kinshasa Democratic Republic of the Congo

The sand bars, in perpetual transformation, observable in the middle course of the Kasai river on the section between the city of Ilebo (pk605) to the confluence of the Loange river (pk525), pose enormous navigability problems. This may be dependent on hydrosedimentological characteristics of the Kasai River. This abundance of sand thus conditions the morphology of the middle course of the Kasai River in the section under our study. It therefore constitutes sedimentary navigation obstacles. The objective of this study is the granulometric and mineralogical characterization of the bar sands of the Kasai River in this study section. Particle size analyzes reveal these are moderately well classified to well classified unimodal sands (Classification coefficient between 1.29 to 1.742) largely presenting grain size symmetry and rarely fine asymmetry (Asymmetry coefficient—Skewness between −0.197 to 0.069) with mesorkurtic and rarely leptokurtic and platykurtic acuity (Angulosity coefficient—Kurtosis between 0.814 to 1.323). All these parameters evolve in sawtooth patterns from upstream to downstream. And then, an automated mineralogical analysis of the sands of the Kasaï River using a Qemscan FEG Quanta 650 made it possible to determine a very varied mineralogical procession with a sawtooth evolution. It is largely dominated by quartz (between 93.73% and 99.07%), followed by calcite (0.01% - 2.66%), iron oxides (0.01% - 1.88%), orthoclase (0.04% - 0.99%), plagioclase (0.01% - 0.75%) and Kaolinite (0.18% - 0.71%). Finally, this mineralogical procession is characterized by a group of minerals which do not reach the threshold of 0.55% such as: illite, apatite, ilmenite, muscovite, chlorite, biotite, montmorillonite, rutile, pyrophyllite, siderite, zircon and dolomite. The evolution of the mineralogical procession of the sands of the bars is not as clear as in the case of particle size parameters.

关键词： Characterization Granulometric Mineralogical Sands Middle Course Kasai River

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Simultaneous field-free molecular orientation and planar delocalization by THz laser pulses[Invited]

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Chinese Optics Letters 2022年第10期20卷 42-48页

作者： dominique Sugny Laboratoire Interdisciplinaire Carnot de Bourgogne(ICB) UMR 6303 CNRS-UniversitéBourgogne Franche ComtéF-21078 DijonFrance

This study shows the unexpected and counterintuitive possibility of simultaneously orienting a molecule while delocalizing its molecular axis in a plane in field-free *** corresponding quantum states are characterized,and different control strategies using shaped terahertz(THz)laser pulses are proposed to reach such states at zero and nonzero *** robustness against temperature effects of a simple control procedure combining a laser and a THz pulse is *** control strategies can be applied not only to linear molecules but also to symmetric top molecules.

关键词： rotational dynamics quantum control molecular orientation and alignment THz laser pulses

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文化的聚落Antipode音乐、青年、文化中心及图书馆

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室内设计与装修 2024年第8期 92-98页

作者： [法国]dominique Coulon&associés Eugeni PONS(摄影) 秋落(编译) dominique Coulon & associés

Antipode文化中心位于La Courrouze生态区新协调的开发区内,距离雷恩历史中心不到2 km,拥有便利的有轨电车和软交通连接。项目建在兵工厂的遗址上,周围空旷。为了延续人们对它的记忆,规划师Secchi和Vigano尝试了各种方案,将一些墙壁以... 详细信息

Antipode文化中心位于La Courrouze生态区新协调的开发区内,距离雷恩历史中心不到2 km,拥有便利的有轨电车和软交通连接。项目建在兵工厂的遗址上,周围空旷。为了延续人们对它的记忆,规划师Secchi和Vigano尝试了各种方案,将一些墙壁以及点缀地平线的大树保留了下来,使穿插在场域里的建筑像大大小小被植被淹没的岛。

关键词：有轨电车生态区规划师文化地平线

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Distribution of Atmospheric Pollution in Southern Benin

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Open Journal of Air Pollution 2024年第1期13卷 23-55页

作者： Dossou-Gbete Sèdami Codjo Joël Kpadonou dominique Gbaguidi An Magloire Elegbede Vitalique Saizonou Kpèssou Virtus Mickael Youssao Abdou Karim Alassane Dovonon Firmin Léonce Vodounnon Armand Doctoral School of Exact and Applied Sciences University of Abomey-Calavi (UAC) Abomey-Calavi Benin Ecotoxicology and Quality Study Research Unit Applied Chemistry Study and Research Laboratory Department of Chemical Engineering-Processes (GC-P) Polytechnic School of Abomey-Calavi University of Abomey-Calavi Abomey-Calavi Benin Africa Synergy Group Plus Cotonou Benin

This study focuses on air quality in southern Benin in order to show public authorities what the Beninese populations are exposed to for efficient decision-making. Two sampling campaigns were carried out, one in the wet period and the other in the dry season. The measurements were taken using a monitor called an “Air Quality Monitor”. For data processing, the multiple comparison methods of Dun (1961) and the Wilcoxon test were used. To maintain legitimacy, all spatial data were included in the official cartographic repository of Benin: WGS 1984, Transverse Mercator Universe Projection (UTM), Zone 31 North. The Moran statistic was used to measure the levels of spatial autocorrelation of the variables studied and to test the significance. In order to locate the spatial subsets, the local spatial association indices of Anselin Local Moran and Getis-Ord, Gi* were used. In terms of results, on the 13 monitoring sites and the 8 parameters chosen to determine air quality, we do not note any significant inter-seasonal difference. Of the eight parameters, only three parameters present spatial autocorrelation leading to predictions of ambient air quality over the entire study area based on the distance separating the points, namely, PM2.5, PM10 and ambient air quality index (AQI). The localities affected by atmospheric pollution in South Benin are located in the south-western part of Benin, headed by Cotonou, which is heavily polluted by CO2, TCOV, PM10 and PM2.5.

关键词： Spatial Distribution Atmospheric Pollutants Southern Benin

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Epidemiological, Clinical Aspects and Outcome of Measles in a Low-Income Country in 2023

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Open Journal of Pediatrics 2024年第1期14卷 139-148页

作者： Sime Tchouamo Arielle Annick Enyama dominique Noukeu Diomède Atyam Ekotto Marie Christine Abouame Palma Haoua Epee Ngoue Jeannette Kago Tague Daniel Armand Touka Eric Brice Tasse Simo Nathalie Ines Nguéfack Félicité Faculty of Medicine and Pharmaceutical Sciences of University of Dschang Dschang Cameroon Gynaeco-Obstetric and Pediatric Hospital of Yaounde Yaounde Cameroon Gynaeco-Obstetric and Pediatric Hospital of Douala Douala Cameroon Regional Annex Hospital of Dschang Dschang Cameroon Faculty of Medicine and Biomedical Sciences of University of Garoua Garoua Cameroon Faculty of Medicine and Biomedical Sciences of University of Yaounde 1 Yaounde Cameroon West Regional Delegation of Public Health Bafoussam Cameroon

Introduction: Measles remains a worrying health problem in sub-Saharan African countries. There have been measles outbreaks in Cameroon with the most recent occurring between October 2022 and September 2023. The Centre region of Cameroon was the most affected in the country and being at the frontline of the fight against this illness, we conducted this study in order to determine the epidemiological and clinical characteristics as well as the outcome of children who contracted the measles and were hospitalized at the Yaoundé Gynaeco-Obstetric and Pediatric Hospital. Methodology: We conducted a cross-sectional descriptive and prospective study for one year from October 2022 to November 2023 corresponding to the duration of the outbreak. We included all children admitted in the pediatric unit for measles and its complications during this period. Results: In total, 60 children were enrolled. Their caregivers were mostly their mothers who had a mean age of 34.71 ± 9.55 years living in significant precarious conditions for the majority. The median age of children was 16 months (09 - 30 months). Twenty six percent of children (16) were less than 9 months. Girls were predominant (55%). Most children were not up to date with their routine EPI vaccination (80%) and most did not receive the measles and Rubella vaccine (76.67%). Clinical manifestations, included fever, conjunctivitis, and cough. Skin rash and catarrh (98.33% and 86.67% respectively) are the case definition signs of measles. The outcome was unfavorable for 4 children. One had a neurological disorder: coma and three presented with pneumonia and severe respiratory distress (6.67%). Conclusion: Measles is still being a reality and claiming lives in our context, emphasis should be made on immunization coverage and if possible, advocacies should be formulated to decrease the age of measles vaccine administration.

关键词： Measles Complications Low-Income Countries

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