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Root cause of corrosion failure of tin coating on wire clamp in marine atmosphere

Journal of Iron and Steel Research International 2024年第4期31卷 998-1014页

作者： Zhen Zhong Wang-yan ly Teng-yuan Liu Yi Xie Yang Yang Zhen-zhu Wang Deng-ke Li Xiao-bo Li Tang-qing Wu School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105HunanChina Electric Power Research Institute of Guangdong Power Grid Co. Ltd.Guangzhou 510080GuangdongChina Shenyang National L aboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina School of Materials Science and Engineering.University of Science and Technology of China Shenyang 110016LiaoningChina Electric Power Research Institute State Grid Hunan Electric Power CompanyChangsha 410007HunanChina School of Mechanical Engineering and Mechanics Xiangtan UniversityXiangtan 411105HunanChina School of Information Science and Engineering Changsha Normal UniversityChangsha 410199HunanChina

The failure cause of a tinned copper wire clamp in marine atmosphere was studied systematically by X-ray photoelectron spectroscopy,scanning electron microscopy with energy dispersive spectroscopy and electrochemical *** main components of the green rust on the surface of the damaged wire clamp are SnO_(2),CuO,Cu_(2)Cl(OH)_(3) and CuCO(OH)_(2).Much of green rust distributes at the platform edge along the axial direction on the crimp connection,and severe corrosion and corrosion pits occur at the platform edge zone along the axial *** enriching Cl-at the marine atmosphere and the existing O_(2) in air collectively enhance the corrosion process of the tin coating and the copper *** element model results show that the residual stress and strain of the tin coating are the largest at the platform edge along the axial direction on the crimp connection,and the corresponding electrode potential of the tin coating at this zone drops *** above results indicate that the residual strain increases the driving force of the corrosion electrochemical reactions and accelerates the corrosion rate and the pit corrosion of the tin coating at this zone.

关键词： Tin coating Marine atmosphere Residual strain-Chloride ion Corrosion failure

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Infantile Spinal Muscular Atrophy at the Albert Royer National Children’s Hospital Center in Dakar

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Open Journal of Pediatrics 2024年第3期14卷 514-521页

作者： Guillaye Diagne Khadim Bop Sofiatou Dieye Arame Faye Fatou ly Amadou Lamine Fall Pediatrics Ward of Pikine Hospital Pikine Senegal Pé diatrics Ward of Albert Royer National Hospital Dakar Senegal

Introduction: Infantile spinal muscular atrophy (ISA) is an autosomal recessive disease caused by primary degeneration of cells in the anterior horn of the spinal cord, leading to muscle weakness and hypotonia. Its incidence is estimated at 1 in 6000 births worldwide. In Africa, particularly in Senegal, there are few studies interested on this pathology. We therefore deemed this study necessary, which set itself the objective of describing the diagnostic, therapeutic and progressive aspects of infantile spinal muscular atrophy at the Albert Royer National Children’s Hospital Center in Dakar (CHNEAR). Methodology: We conducted a retrospective descriptive study over a period of two (2) years from December 2020 to December 2022. Included were all hospitalized patients in whom the diagnosis of spinal muscular atrophy was made with or without genetic confirmation. The data were collected on a pre-established form then entered and analyzed with the following software: Excel 2013 and R version 4.1.3. Results: During our study period, 2100 children were hospitalized, the annual incidence was 0.76%. The average age of our patients was 9 ± 9 months with a range of 3 months to 32 months and the median was 6.5 months. The sex ratio was 7. The notion of family consanguinity was found in 62.5% of cases and the notion of ISA in the family in 25% of cases. Hypotonia and respiratory distress were found at the forefront in equal proportions (50% of cases). Electromyogram (EMG) was performed in 3 patients (37.5%). Symptomatic medical treatment was administered in 100% of patients, 04 patients had benefited from respiratory physiotherapy, i.e. 50% of cases, and genetic counseling was carried out in one patient (12.5%). The evolution was immediately favorable in 2 patients or 25% of cases, unfavorable in 75% of cases with a death rate of 50% and the average age of death was 5.5 months ± 1 with extremes ranging from 3 to 7 months. Conclusion: The number of Infantile spinal muscular atrop

关键词： Spinal Muscular Atrophy Child Hypotonia Dakar

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Flexible and multifunctional triboelectric nanogenerator based on liquid metal/polyvinyl alcohol hydrogel for energy harvesting and self-powered wearable human-machine interaction

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Rare Metals 2024年第3期43卷 1186-1196页

作者： Hou-Wang Zhou Cong Zhao Ze-Yu Zhao Jun-Chen Jiang Hui-Le Jin Shun Wang Shuang Pan Min-Yi Xu Yi-Huang Chen hai-Ming Jin Department of Orthopaedics The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical UniversityWenzhou325027China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou325035China Dalian Key Laboratory of Marine Micro/Nano Energy and Self-Powered Systems Marine Engineering CollegeDalian Maritime UniversityDalian116026China

Hydrogel-based triboelectric nanoge nerator(TENG)has a promising applied prospect in wearable electronic ***,its low performance,poor stability,insufficient recyclability and inferior self-healing seriously hinder its ***,we report a robust route to a liquid metal(LM)/polyvinyl alcohol(PVA)hydrogel-based TENG(LP-TENG).Owing to the intrinsically liquid feature of conductive LM within the flexible PVA hydrogel,the as-prepared LP-TENG exhibited comprehensiye advantages of adaptability,biocompatibility,outstanding electrical performance,superior stability,recyclability and diverse applications,which were unattainable by traditional ***,the LP-TENG delivered appealing open circuit voltage of 250 V,short circuit current of 4μA and transferred charge of 120 nC with high stability,outperforming most advanced TENG *** LP-TENG was successfully employed for versatile applications with multifunctionality,including human motion detection,handwriting recognition,energy collection,message transmission and human-machine *** work presents significant prospects for crafting advanced materials and devices in the fields of wearable electronics,flexible skin and smart robots.

关键词： Liquid metal Hydrogel Wearable TENG Multifunctionality Human-machine interaction

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Convenient room-temperature synthesis of sulfur and nitrogen co-doped NiCo-LDH coupled with CNTs on NiCo foam as battery-type electrode for high performance hybrid supercapacitor

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Rare Metals 2024年第9期43卷 4286-4301页

作者： Li Song Xiao-Hong Zhong Fang-Lin Wang Zhi-Hui Huang Zhe Hong Yun-Fang Gao hai-Dong Wang Jian-Wei Ren Sheng-Jie Peng Lei Li College of Biological Chemical Sciences and EngineeringJiaxing UniversityJiaxing 314001China College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014China College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Research and Development Department Jiangxi Ganfeng LiEnergy Technology Co.Ltd.Xinyu 338000China Department of Mechanical Engineering Science University of JohannesburgAuckland ParkJohannesburg 2092South Africa

The convenient synthesis of the composite electrode with high supercapacitance performance plays an important role in practical application but is ***,the carbon nanotubes(CNTs)coupled with lowcrystalline sulfur and nitrogen co-doped Ni Co-LDH(denoted as SN-Ni Co-LDH)nanosheets array are grown on Ni Co foam(NCF)substrate by two convenient steps of metal induced self-assembly and corrosion engineering,which present the advantages of operating at roomtemperature and low preparation *** from the S–N co-doping and low-crystallinity of Ni Co-LDH,the prepared SN-Ni Co-LDH@CNTs@NCF electrode presents a topping charge capacity of 2470 C·g^(-1)(4.94 C·cm^(-2))at 5 m A·cm^(-2).Furthermore,the fabricated asymmetry supercapacitor(ASC)achieves an extraordinary energy density of 77 Wh·kg^(-1)(0.617 m Wh·cm^(-2))at a power density of 438 W·kg^(-1)(3.5 m W·cm^(-2))and outstanding stability(91%capacity retention after 5000 cycles at20 m A·cm^(-2)).Impressively,the structure evolution of Ni Co-LDH during the charge/discharge processes has been thoroughly elucidated by in-situ Raman ***,this work verifies a powerful strategy and practical value for preparing composite electrodes with high supercapacitance performance,and also provides guidance for the rational design of the smart electrodes.

关键词： Supercapacitor NiCo-LDH Carbon nanotubes Sulfur and nitrogen co-doped Convenient synthesis

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乐子毅进入生活感受连接

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摄影之友 2024年第2期 78-85页

作者： ly(文) 乐子毅(图) 不详

摄影师乐子毅用自己的镜头关注到生活在城市中的异乡人,他用相机记录着这些人的真实生活,用影像建立起与他们之间的连接状态。尽可能用最真实客观的目光注视着当下年轻人的生活状态。

关键词：连接状态异乡人真实客观摄影师生活年轻人

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Morbidity and Mortality Related to Infectious Diseases in the Roi Boudouin Paediatric Ward in Senegal

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Open Journal of Pediatrics 2024年第4期14卷 727-737页

作者： Guillaye Diagne Aliou Abdoulaye Ndongo Djeneba Fafa Cissé Sidy Lamine Mbaye Jean Baptiste Niokhor Diouf Fatou ly Pediatrics Ward of Pikine Hospital Pikine Sngal Pediatrics Ward of Roi Boudouin Hospital Dakar Sngal

Introduction: Infant and child morbidity and mortality linked to infections remain a major concern in both developed and developing countries. The general objective was to determine the characteristics of hospital morbidity and mortality linked to infectious pathologies in the pediatric department of the King Baudouin hospital center in Dakar. Methods: This was a retrospective, descriptive and analytical study focusing on children hospitalized from January 1, 2018 to December 31, 2021 in the pediatric department of the King Baudouin hospital center in Dakar. Results: During the study period, 1474 children were hospitalized for an infectious pathology in the pediatric department. The sex ratio was 1.48. Children aged between one and twelve months represented 34.12%. Morbidity due to respiratory and digestive infections was 42.33% and 33.45%, respectively. Pediatric hospital mortality was 0.75% with a predominance noted in infants between 1 and 12 months (55.86%). Respiratory, digestive infections, sepsis and neurological infections were the main causes of death. Factors associated with mortality were age (1 to 12 months) with p Conclusion: Reducing infant and child mortality linked to infectious diseases remains a crucial challenge to address for improving children’s health. Early detection of related signs, prevention of infections, and adequate care and monitoring of infants and children can contribute to this reduction.

关键词： Morbidity Mortality Infections Children

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Ambulatory Uretrocystoscopy in the Urology Andrology Department of Grand Mbour Hospital

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Open Journal of Urology 2024年第2期14卷 61-70页

作者： Saint Charles Nabab Kouka Ramatoulaye ly Ngor Mack Thiam Modou Diop Cisse Mouhamed Cheikh Diop Yoro Diallo Cheickna Sylla Department of Urology Faculty of Health Sciences University Iba Der Thiam of Thies Thies Senegal

Background: Urethrocystoscopy is a method of endoscopic exploration that allows direct visualization of the urethra and bladder for diagnosis or treatment of diseases of the lower urinary tract. Purpose: To determine the epidemiological profile of patients who underwent urethrocystoscopy and to present the indications and the results of this endoscopic examination. Patients and Methods: This is a retrospective, descriptive study of all patients who underwent outpatient urethrocystoscopy in the Urology and Andrology department of Grand Mbour hospital. The epidemiological data of the patients, the indications, the results of the endoscopic exploration and the additional procedures performed were entered and analyzed with Excel 2016. We performed descriptive statistics. Results: Of the 216 patients who underwent outpatient urethrocystoscopy, we counted 179 men (82.87%) and 37 women (17.13%). The sex ratio was 4.84. The mean age of the patients was 53.71 ± 18.76 years (age range 17 to 91 years). The main indications were lower urinary tract disorders (60.18%) and hematuria (28.70%). Endoscopic exploration revealed prostatic tumor in 69 patients (31.9%), 29 cases of bladder tumors (13.4%) and 19 cases of bilharzia cystitis (8.8%). The urethrocystoscopy was normal in 32 patients (14.8%). Conclusion: Urethrostoscopy is an endoscopic exploration examination that can be performed on an outpatient basis. Lower tract urinary disorders and hematuria were the main indications.

关键词： Urethrocystoscopy Outpatient Indications Diagnosis Mbour

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基于遗传算法的双频共孔径稀疏天线阵列

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固体电子学研究与进展 2024年第4期44卷 310-314页

作者：蓝海西南电子技术研究所成都610036

针对卫星通信和数据传输等应用,提出了一款基于遗传算法的双频(Ku/S)共孔径稀疏阵列天线。该阵列天线具有剖面低、集成度高、副瓣低等优点。双频天线阵列在单一圆孔径中集成了稀疏排布的高频段(Ku:17 GHz)阵列与低频段(S:2.25 GHz)阵列... 详细信息

针对卫星通信和数据传输等应用,提出了一款基于遗传算法的双频(Ku/S)共孔径稀疏阵列天线。该阵列天线具有剖面低、集成度高、副瓣低等优点。双频天线阵列在单一圆孔径中集成了稀疏排布的高频段(Ku:17 GHz)阵列与低频段(S:2.25 GHz)阵列,其中高频阵列排布方式基于遗传算法优化得到,具有低副瓣,高增益的特点,并为低频阵列的嵌入提供物理空间;低频阵列以三圈圆环阵列形式嵌入高频阵列中,可进一步优化高频阵列以保持高低频阵列均处于最优状态。所提出的双频天线阵列在60°扫描范围内获得高低频增益分别为26 dBi和15 dBi,均具有≥20 dB的副瓣抑制,且相对于全阵列天线,优化后阵面尺寸仅为原尺寸的60%。

关键词：交叉融合共孔径稀疏阵圆环阵双频

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边缘下皮质(IL)的动态改变以及IL对前边缘皮质(PL)的调控参与大鼠慢性炎症痛

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中国疼痛医学杂志 2024年第7期30卷 158-158页

作者：刘风雨(译) 北京大学神经科学研究所

慢性疼痛是临床的常见病。内侧前额叶皮质(medial prefrontal cortex,mPFC)参与慢性疼痛发病机制。前边缘皮质(prelimbic cortex,PL)是mPFC的一个核心亚区,介导慢性疼痛。边缘下皮质(IL)是mPFC的另一个亚区,也能够调控伤害性反应。神经... 详细信息

慢性疼痛是临床的常见病。内侧前额叶皮质(medial prefrontal cortex,mPFC)参与慢性疼痛发病机制。前边缘皮质(prelimbic cortex,PL)是mPFC的一个核心亚区,介导慢性疼痛。边缘下皮质(IL)是mPFC的另一个亚区,也能够调控伤害性反应。神经解剖学研究表明,IL深层的兴奋性锥体神经元通过支配PL深层的抑制性中间神经元,进而作用到PL局部的锥体神经元上,调控PL的功能。IL、PL以及IL-PL环路如何参与慢性疼痛的发病机制,不甚清晰。研究者采用完全弗氏佐剂(complete Freund's adjuvant,CFA)建立的大鼠慢性炎症痛模型,结合体电生理记录和化学遗传学等方法,深入解析IL、PL及其环路在慢性疼痛中的作用。

关键词：中间神经元完全弗氏佐剂慢性疼痛神经解剖学锥体神经元大鼠发病机制

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Analysis of Factors Associated with the Abandonment of Nutritional Recovery among Parents of Severely Malnourished Children Aged 6 to 59 Months in the Health District of Titao, Burkina Faso

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Open Journal of Nursing 2024年第9期14卷 477-490页

作者： Aminata Gansore Patrice Ngangue Birama Apho ly Ludovic K. N’Tcha Douglas Mbang Massom Gbètogo Maxime Kiki Josiane Seu Nestor Bationo Noufou Gustave Nana Fla Koueta Institute for Interdisciplinary Training and Research in Health and Education Sciences Ouagadougou Burkina Faso Faculty of Nursing Laval University Quebec Canada Faculty of Medicine and Odonto Stomatology University of Sciences Techniques and Technology of Bamako Bamako Mali Centre de Recherche Entomologique de Cotonou Cotonou Benin Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Centre for Interdisciplinary Research in Rehabilittaion and Social Integration (CIRRIS) Laval University Quebec Canada Faculty of Health Sciences Joseph Ki-Zerbo University Ouagadougou Burkina Faso

Introduction: In Burkina Faso, undernutrition is a public health problem associated with more than 40% of infant and child mortality. Undernutrition management is complex, and there is often a risk of treatment abandonment. Studies on this topic have not explored the influence of environmental and therapeutic factors on parental compliance. This study proposes an analysis of factors influencing the abandonment of nutritional recovery by parents of malnourished children aged 6 to 59 months in ambulatory care. Methods: This was a descriptive and exploratory qualitative study. Data collection took place in February 2020. Data were collected from seventeen (17) participants via in-depth interviews (IDI) and direct observation. The IDIs were transcribed verbatim and thematically analyzed using Nvivo software. Results: The results revealed that factors related to the physical environment, such as geographical inaccessibility, pastoral occupation, displacement at auriferous sites, and insecurity, are important causes of nutritional recovery abandonment. They also prove that factors related to the social environment, such as lack of family and social support, feelings of shame, stigmatization, occupation of the mother, and social events, lead to this abandonment. In addition, therapeutic factors such as interruptions of supplies of Ready to Use Therapeutic Food (RUTF), feeling of improvement or worsening of the state of health, recourse to traditional medicine, and ignorance of undernutrition are also associated with this issue. Conclusion: This study highlighted barriers to the abandonment of nutritional recovery among parents of severely malnourished children aged 6 to 59 months in the health district of Titao, Burkina Faso. It is more important to consider these different factors when evaluating care protocols so that policies to reduce child undernutrition can considerably impact the targets.

关键词： Nutritional Recovery Severe Acute Malnutrition Environmental Factors Therapeutic Factors Abandonment Burkina Faso

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