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Impact of pH Water and mineralogical microstructure of Soil mixed with Wood Waste on the Compressive Strength of Composite Bricks;and Bricks Resistance modeling

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Open Journal of Civil Engineering 2020年第1期10卷 9-21页

作者： Gilbert Ganga Narcisse malanda diog.ne Pongui Ngoma Timothée Nsongo michel Dzondo Gadet National Advanced School of Engineering University Marien NGouabi Brazzaville Congo Center for Research and Initiation of Technology Projects (CRIPT) Brazzaville Congo Laboratory of mechanics Energtics and Engineering ENSP-UMNG Brazzaville Congo faculty of Science and Technology University Marien NGouabi Brazzaville Congo Centerof Géological and mining Research (CRGm) Brazzaville Congo

This study includes the manufacture of cement stabilized clay bricks with embedded mahogany chips. The impact of this waste and its interaction with water in the bricks was evaluated on the mechanical properties. The compressive strength tests using a universal press were carried out on bricks with and without adding wood chips. The results obtained show that the incorporation of wood chips into the bricks decreases the compressive strength. This reduction in compressive strength led us to conduct an analysis of clay and water as intrinsic factors, before and after incorporation of untreated wood waste. Thus, a mineralogical analysis of the clay with and without mahogany chips was made using an X-ray diffractometer, using an anticathode of cobalt with the line Κα, of wavelength λ = 1789Å. After quantification of the mineral constituents, it is noted that the concentration of SiO2 decreases considerably in the clay with addition of wood chips, resulting in the reduction of the compressive strength in these composite materials (from Rc = 9.26 mPa at 0% of chips to 3.55 mPa at 8%). A mathematical model following the interpolations of Lagrange was then proposed. The analysis of the water resulting from the impregnation of dry wood chips in the water, shows that the water becomes strongly acid (pH = 4.3 at the 7th day of immersion), thus contributing to the reduction of resistance. This analysis of intrinsic factors will allow future studies to take into account the treatment of wood waste by different processes in order to increase the mechanical, thermal and acoustic properties of composite bricks with the same contents, thus generating massive support for the use of its composite materials.

关键词： Clay Bricks mineralogical Analysis Wood Chips Compressive Strength pH Water

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分类视角下认知诊断测验项目区分度指标及应用

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心理科学 2018年第2期41卷 475-483页

作者：汪文义宋丽红丁树良江西师范大学计算机信息工程学院南昌330022 江西师范大学初等教育学院南昌330022

在认知诊断中还没有指标能在无作答数据情况下直接评价项目的属性分类准确率或属性判准率。项目水平上的属性分类准确率,与项目属性向量、项目参数、先验分布和作答反应等有关。综合各个影响因素定义了项目水平上的属性期望分类准确率指... 详细信息

在认知诊断中还没有指标能在无作答数据情况下直接评价项目的属性分类准确率或属性判准率。项目水平上的属性分类准确率,与项目属性向量、项目参数、先验分布和作答反应等有关。综合各个影响因素定义了项目水平上的属性期望分类准确率指标,并将其用于组卷。模拟研究显示:新指标可十分准确地评价项目的属性判准率,新指标对于项目筛选十分重要;以模式分类准确率为评价指标,基于新指标的组卷方法与经典的组卷方法表现相当。

关键词：分类准确率项目属性期望分类准确率组卷确定性输入噪音与门模型

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Practice of Pediatric Neurosurgery at the “Hôpital Spécialisémère-Enfant Blanche Gomes” in the Republic of the Congo

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Open Journal of modern Neurosurgery 2023年第1期13卷 41-50页

作者： Boukaka Kala Rel Gerald Kinata Bambino Sinclair Brice Ekouele mbaki Hughes Brieux Bingui Outman Pascal diog.ne Boukassa Léon moukouengo Nee Kaya fleur Patricia mabiala Babela Jean Robert Service de chirurgie pédiatrique H&#244 pital spécialisé mère-Enfant Blanche Gomes (HSmEBG) Brazzaville Républic of the Congo Service de Chirurgie Polyvalente CHU de Brazzaville Brazzaville Républic of the Congo faculty of Health Sciences Université Marien Ngouabi Brazzaville Républic of the Congo Service de Pédiatrie H&#244 pital spécialisé mère-Enfant Blanche Gomes (HSmEBG) Brazzaville Républic of the Congo

Introduction: Pediatric Neurosurgery is a growing specialty in its own right worldwide. Its practice in sub-Saharan Africa remains confronted with many challenges, notably the absence of a pediatric neurosurgeon, the lack of a dedicated service and the absence of multidisciplinary pediatric collaboration (neuroanesthesist, neurologist, oncologist and psychotherapist). The objective of this preliminary study is to describe the practice of pediatric neurosurgery at the HSmEBG and to present perspectives for its improvement. methods: This is a retrospective, monocentric, descriptive study covering the period from march 2021 to march 2022 at the Pediatric Surgery Department of the HSmEBG. Résults: During the study period, 50 children were hospitalized for a neurosurgical condition. The sex ratio was 1.77. The average age was 6 years with extremes of 2 weeks and 16 years. most children were from the emergency department (46%). Computed tomography (CT) was performed in 35 patients (70%), magnetic resonance imaging (mRI) in 4% and plain radiog.aphy in two patients (8%). malformative, traumatic (cranial and spinal) and tumor pathology were the most frequent with 42%, 36% and 12% respectively. Twenty-six patients were operated (52%). We recorded one postoperative infection (2.5%). The overall mortality was 8% (N = 4). Conclusion: This preliminary study allowed us to identify the epidemiological and clinical profile of the patients treated in our context as well as the therapeutic approach. malformative pathology remains the most frequent, followed by traumatic and tumor pathology. The development of the practice of this discipline remains a challenge in our working conditions and requires the training of pediatric neurosurgeons and dedicated paramedical staff.

关键词： Neurosurgery Pediatric Practice Brazzaville

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Socio-Demographic Profile of Adults Admitted in Emergency for Brain Trauma Injuries at the University Hospital of Brazzaville (Congo)

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Open Journal of modern Neurosurgery 2019年第1期9卷 43-48页

作者： Hugues Brieux Ekouele mbaki Pascal diog.ne Bingui Outman marie Elombila Darius Eryx mbou Essie Christ mayick mpoy Emy monkessa Rel Gerald Boukaka Kala Léon Boukassa Gilbert fabrice Otiobanda faculty of Health Sciences Marien Ngouabi University Brazzaville Congo Department of Intensive Care University Hospital of Brazzaville Brazzaville Congo Cheikh Anta Diop University Dakar Senegal

The aim of this study was to evaluate socio-demographic profile of adults admitted in emergency for Traumatic Brain Injury (TBI) at the University Hospital of Brazzaville in the Republic of Congo. We performed a prospective study within a period of six months, into the surgical unit of the emergency department of the University Hospital of Brazzaville. A total of 2617 patients were recorded, among which 268 cases were TBI (10.25%) where 142 cases were sampled in our series. The average age was 36.7 ± 16.6 years. The sex ratio was 6.1. The TBI was mainly due to road accident in 121 cases (85.2%) described as follows: motorcycle accident about 48 cases (39.7%) and the pedestrian’s injuries about 42 (34.8%). In the majority of the cases, cautions were not taken by the drivers;during the case of the motorcycle accident, about 97.9% of the riders did not wear a helmet. The TBI remains a growing public health concern in the low-income countries, like in Africa. measurements on the road traffic regulation are to be strengthened to reduce the growth of this silent epidemic.

关键词： Traumatic Brain Injury Road Accident Brazzaville

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关于马路市场问题的调查

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交通企业管理 2010年第5期25卷 20-21页

作者：王晓冬程越江苏省如东县公路管理站

马路市场是自发形成、占道经营、具备一定规模而又不规范的商品经营场所。它影响道路交通秩序，严重影响路容路貌，危及公路行车安全。因其形成原因复杂，很难彻底根治，从而成为路政管理的一个“老大难”问题。随着地方经济的发展、交... 详细信息

马路市场是自发形成、占道经营、具备一定规模而又不规范的商品经营场所。它影响道路交通秩序，严重影响路容路貌，危及公路行车安全。因其形成原因复杂，很难彻底根治，从而成为路政管理的一个“老大难”问题。随着地方经济的发展、交通流量的增长，马路市场问题对道路交通安全的影响进一步凸显，

关键词：市场问题调查道路交通秩序道路交通安全马路市场占道经营经营场所行车安全

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Characteristics of Deaths of Children in the Pediatrics Department of Hôpital Spécialisé mère-Enfant Blanche Gomes (Republic of the Congo) from 2019 to 2021

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Open Journal of Pediatrics 2023年第4期13卷 581-593页

作者： Pascal diog.ne Bingui Outman Nelly Sandrine Guembo Pandzou Rolyne Vanissia madzou Nganie Verlem Bomelefa-Bomel Benoite Diatewa Kadidja Grace Nkounkou milandou Jean Brice mouendenguia Luopou Lamah Audrey Niangui-Bakala Dorthéa Banga massalat Rel Gérald Boukaka Kala Jean Robert mabiala Babela Pediatrics Department H&#244pital Spécialisé Mère-Enfant Blanche Gomes (HSMEBG) Brazzaville Republic of the Congo Neonatology Department H&#244pital Spécialisé Mère-Enfant Blanche Gomes Brazzaville Republic of the Congo Pediatric Surgery Department H&#244pital Spécialisé Mère-Enfant Blanche Gomes Brazzaville Republic of the Congo Pediatrics Department University Hospital Center of Brazzaville Brazzaville Republic of the Congo faculty of Health Sciences Marien Ngouabi University Brazzaville Republic of the Congo

Introduction: The United Nations Sustainable Development Goals (SDGs) aim to decrease the global maternal mortality ratio to below 70 per 100,000 live births and eliminate preventable deaths of newborns and children under the age of five in all countries by 2030. The pediatric department at Spécialisé mère-Enfant Blanche Gomes Hospital (HSmEBG) is divided into two sectors, one catering to children aged one month to four years and the other dedicated to children aged five to 17 years. According to department records, over the past three years, there has been an average of 1050 hospitalizations per year, with an average duration of five days. Objectives: This study aims to describe the socio-demographic characteristics of children who died while in the pediatrics department of the HSmEBG and analyze the factors associated with their deaths. methodology: A retrospective analytical cross-sectional study was conducted, collecting data over a three-year period, covering the years 2019, 2020 and 2021. Data were collected from medical records of deceased children using Excel software version 2016, and statistical calculations and logistic regression were performed using Epi info software version 7.***.5.0. Results: During the three years of operation, the pediatric department at HSmEBG recorded 3060 new admissions, of which 271 resulted in death, representing an overall frequency of 8.8%. December and January had the highest mortality rates, accounting for 15.5% and 12.5%, respectively. Out of the 271 recorded deaths, 143 (52.77%) occurred in children under the age of one, and 230 (84.87%) occurred in children under the age of five. The average age at death was 2.4 years, ranging from one month to 17 years. The sex ratio was 1. more than half of the deaths (51.66%) occurred during the night, and 165 (60.89%) sought medical help more than three days after the onset of symptoms. Weekend deaths accounted for nearly half (45.7%) of the cases. Upon admission, slightly over half of

关键词： Death Children Associated factors Brazzaville

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一种轻量化手写数字的识别算法

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钦州学院学报 2019年第7期34卷 46-53页

作者：解修亮徐晓光丁理安徽工程大学电气工程学院

在手写阿拉伯数字识别系统中,传统手写数字识别算法准确率不高。基于LeNet-5卷积神经网络算法,提出一种轻量化的卷积神经网络算法。利用全局平均池化算法代替原有的全连接层降低算法训练参数的规模;利用RELU函数代替tanh函数作为激活函... 详细信息

在手写阿拉伯数字识别系统中,传统手写数字识别算法准确率不高。基于LeNet-5卷积神经网络算法,提出一种轻量化的卷积神经网络算法。利用全局平均池化算法代替原有的全连接层降低算法训练参数的规模;利用RELU函数代替tanh函数作为激活函数、增加BN层等方法来加速网络模型的收敛速度。利用mNIST手写数据集设计了验证实验,实验表明,改进后的算法不但训练参数规模只有LeNet-5训练参数规模的1/3,而且相较于LeNet-5改进后的算法准确率上升了约0.4%。由此证明该算法具备较高的应用及推广价值。

关键词：数字识别卷积神经网络参数规模准确率

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Characteristics of Deaths of Children in the Pediatrics Department of Hôpital Spécialisé mère-Enfant Blanche Gomes (Republic of the Congo) from 2019 to 2021

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Open Journal of Pediatrics（儿科学期刊） 2023年第4期

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