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Removal of Dyes in Aqueous Media with Hydrochar base of Solid Tanneries Waste: optimization Process and Application

Materials Sciences and Applications 2024年第7期15卷 168-185页

作者： Abdoul Ntieche Rahman Gervais Ndongo Kounou Sakué Ngankam Eric Tamafo Fouegue Aymard Didier Kouotou Daouda Abdelaziz baçaoui Department of Chemistry Higher Teacher Training College Bertoua The University of Bertoua Bertoua Cameroon Department of Fundamental Sciences Institute of Wood Technology of Mbalmayo University of Yaound I Balmayo Cameroon Department of Chemistry Faculty of Science Semlalia University of Cady Ayyad Marrakech Morocco

The Response Surface Methodology (RSM) was used to optimise the conditions of preparation of activated hydrochar from tannery solid waste by hydrothermal carbonisation (HTC). The main factors such as residence time, moisture content and final carbonisation temperature were investigated during the optimisation of hydrochar preparation conditions. The three responses investigated are hydrochar yield, iodine and methylene blue indices. The results of experimental analyses showed that the yield of hydrochar decreases with increasing final temperature, leading to the formation of micropores inside the carbonaceous solid. The optimum conditions for preparing the following hydrochar were obtained: 83.10%, 390.44 mg∙g−1 and 259.63 mg∙g−1 respectively for the hydrochar yield, the iodine and methylene blue indices. The specific surface area of prepared hydrochar is 849.160 m2/g, SEM micrographs showed a porous heterogeneous surface and particularly, the hydrochar surface also revealed external pores on the hydrochar surface which acted as a pathway to the micropores. Fourier transform infrared (FTIR), however, showed a predominance of acid functions on the surface of the carbonaceous solids. Tests were carried out to eliminate indigo carmine in aqueous media. Activated hydrochar showed a high level of activity, with the Langmuir and Freundlich isotherms giving an adsorption quantity of 354.610 mol/g and a KF constant of 468.2489, respectively. The findings of the research revealed that hydrochar produced is well adapted for dyes removal.

关键词： Response Surface Methodology Hydrochar Tannery Hydrothermal Carbonization Adsorption

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考虑台地效应的泸定6.8级地震某框架结构震害调查与分析

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土木工程学报 2024年第6期57卷 136-151页

作者：潘毅任靖哲任宇赵靖轩巴振宁西南交通大学土木工程学院四川成都610031 西南交通大学抗震工程技术四川省重点实验室四川成都610031 中信建筑设计研究总院有限公司湖北武汉430014 天津大学天津300350

2022年9月5日四川省泸定县发生6.8级地震,在磨西台地上某框架结构的震害调查中,发现其东区和西区的框架结构出现不同程度的震害,且差异明显。其中,东、西区框架的首层柱上端均发生了“强梁弱柱”型破坏,西区框架中等及以上破坏等级的比... 详细信息

2022年9月5日四川省泸定县发生6.8级地震,在磨西台地上某框架结构的震害调查中,发现其东区和西区的框架结构出现不同程度的震害,且差异明显。其中,东、西区框架的首层柱上端均发生了“强梁弱柱”型破坏,西区框架中等及以上破坏等级的比例达到81%,而东区框架仅为13%,呈现出与台地边缘的强关联性。为分析东、西区框架结构震害差异的原因,采用FK-SEM方法分析了磨西台地的地震放大效应。计算结果表明,距离台地边缘越近,地震放大系数越大。其中,水平和竖向的地震放大系数在西区建筑场地分别为2.30和2.25,而在东区建筑场地则分别为2.01和1.99。在此基础上,采用磨西台站的地震动记录,对东、西区框架结构进行了震害模拟,分析了其破坏原因。研究结果表明:磨西台地边缘的地震影响系数的实际放大系数超过了《抗规》规定,存在不利地段影响和近场地震效应叠加的情况,仅按《抗规》不利地段进行考虑,多层框架结构难以实现“大震不倒”的设防目标;竖向地震作用是框架柱下端破坏的直接原因,主要破坏形态为偏拉、偏压破坏,水平地震作用导致其二次破坏;“仿雀替”构造对结构整体变形能力不利,是框架结构“强梁弱柱”型破坏的主要原因。根据震害调查和分析结果,建议在9度近断层设防地区,靠近台地边缘的多层框架结构,设计前宜对建筑场地进行分析,并考虑竖向地震的影响;在有民族特色的建筑设计中,应将“仿雀替”等装饰物与框架脱离,设计为非结构构件,以减少其对框架结构抗震性能的不利影响。

关键词：泸定地震震害调查台地效应震害模拟框架结构竖向地震

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房地产企业粉饰负债测度及其对公司经营的影响

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金融发展研究 2024年第4期 32-43页

作者：巴曙松黄沁张兢北京大学汇丰金融研究院广东深圳518055 重庆大学经济与工商管理学院重庆401120 西南政法大学商学院重庆401120

在“房住不炒”“三道红线”等调控政策背景之下,房地产企业可能产生“粉饰负债”等机会主义行为,严重损害企业财务信息披露质量,进而干扰市场决策并削弱政策效果。因此,本文以2011—2022年中国沪深A股房地产上市企业为样本,测度房地产... 详细信息

在“房住不炒”“三道红线”等调控政策背景之下,房地产企业可能产生“粉饰负债”等机会主义行为,严重损害企业财务信息披露质量,进而干扰市场决策并削弱政策效果。因此,本文以2011—2022年中国沪深A股房地产上市企业为样本,测度房地产企业粉饰负债规模,并实证检验房地产企业粉饰负债对公司经营的影响。研究发现:中国房地产企业存在粉饰负债的机会主义行为;房地产企业粉饰负债,可以在短期内避免债务违约,在长期却使得投资效率降低和现金流约束加强,其本质是用短期利益去置换长期利益;国有产权能够发挥治理作用,在一定程度上缓解以上负向影响,而董事长性别与学历在短期内会有较弱的促进作用。

关键词：粉饰负债房地产企业过度负债金融监管

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Management of Penetrating Cranioencephalic Trauma Caused by Sharp Metal objects—Therapeutic and Evolutionary Aspects: 12 Cases at the Renaissance University Hospital in N’Djamena

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open Journal of Modern Neurosurgery 2024年第2期14卷 170-178页

作者： Goumantar Félicien Toudjingar Li-Iyane olivier ouambi Yannick Canton Kessely Donal Djasdé Mahouli Fata Vounki Momar Codé ba Neurosurgery Unit of Center Hospitalier Universitaire la Renaissance N&#8217Djamena Chad Neurosurgery Unit of CHU la Ré f&#233rence Nationale N&#8217Djamena Chad Neurosurgery Department of Centre Hospitalier National Universitaire de Fann Dakar Senegal

Introduction: Cranioencephalic trauma caused by bladed weapons is rare, and that caused by sharp objects is exceptional. The aim of our study was to describe the clinical, therapeutic and evolutionary aspects. Materials and method: This was a descriptive and analytical study over a 48-month period at CHU la Renaissance from January 1, 2018 to December 31, 2021, concerning patients admitted for penetrating cranioencephalic trauma by pointed object. Results: Twelve cases, all male, of penetrating cranioencephalic sharp-force trauma were identified. The mean age was 34 ± 7 years, with extremes of 11 and 60 years. Farmers and herders accounted for 31% and 25% of cases respectively. The average admission time was 47 hours. Brawls were the circumstances of occurrence in 81.2% of cases. Knives (33%), arrows (25%) and iron bars (16.6%) were the objects used. Altered consciousness was present in 43.8% of cases, and focal deficit in 50%. Scannographic lesions were fracture and/or embarrhment (12 cases), intra-parenchymal haematomas (6 cases) and presence of object in place (4 cases). Surgery was performed in 11 patients. Postoperative outcome was favorable in 9 patients. After 12 months, 2 patients were declared unfit. Conclusion: Penetrating head injuries caused by sharp objects are common in Chad. Urgent surgery can prevent disabling after-effects.

关键词： Penetrating Trauma Skull Encephalon Sharp object Surgery Patient outcome

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Phenotypic Detection of Enterobacterales Strains Susceptible of Producing oXA-48 Carbapenemase

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Advances in Microbiology 2024年第2期14卷 115-121页

作者： Abdoulaye Seck Abdou Diop babacar Ndiaye Assane Dieng Awa ba Amadou Diop Chantal Mahou Douala-Djemba Thierno Abdoulaye Diallo Cheikh Anta Diop University of Dakar Dakar Senegal Medical Biology Laboratory Pasteur Institute of Dakar Dakar Senegal

background: Nowadays, emergence of Carbapenemase-Producing Enterobacterales (CPE) throughout the world has become a public health problem, especially in countries with limited resources. In recent years, CPE of type oXA-48 (Ambler class D) have been identified in Dakar. The aim of this study was to evaluate the phenotypic detection of oXA-48 CPE using a temocillin disc (30 μg). Methodology: A retrospective study was carried out at Medical Biology Laboratory of Pasteur Institute in Dakar on Ertapenem-Resistant Enterobacterales (ERE) strains isolated from 2015 to 2017. These strains were then tested with a 30 μg temocillin disc. Any strain resistant to temocillin (inhibition diameter Results: Forty-one ERE isolated during the study period were tested, of which 34 (82.9%) were oXA-48 based on phenotypic detection using temocillin disc and confirmed by PCR (100%). oXA-48 CPE strains detected were composed of Klebsiella pneumoniae (n = 14;41.2%), Enterobacter cloacae (n = 8;23.5%), Escherichia coli (n = 7, 20.5%), Citrobacter freundii (n = 3;8.8%), Cronobacter sakazakii (n = 1;3%) and Morganella morganii (n = 1;3%). Conclusion: Temocillin resistance has a good positive predictive value for detecting oXA-48 CPE by phenotypic method, confirmed by PCR. Temocillin is therefore a good marker for detection of oXA-48 CPE except Hafnia alvei.

关键词： Ertapenem Temocillin Phenotypic Detection Carbapenemase-Producing Enterobacterales oXA-48

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中老年人血液常见氨基酸水平与轻度脑白质疏松症的相关性

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首都医科大学学报 2024年第1期45卷 163-168页

作者：邢怡文巴晓红锦州医科大学附属第一医院神经内科辽宁锦州121000

目的探讨中老年人血液常见氨基酸水平与早期轻度脑白质疏松症(leukoaraiosis,LA)的关系及其对轻度LA的筛查诊断价值。方法本研究纳入2020年8月至2021年11月因头晕或头痛等主诉于锦州医科大学附属第一医院神经内科住院的患者,根据头颅磁... 详细信息

目的探讨中老年人血液常见氨基酸水平与早期轻度脑白质疏松症(leukoaraiosis,LA)的关系及其对轻度LA的筛查诊断价值。方法本研究纳入2020年8月至2021年11月因头晕或头痛等主诉于锦州医科大学附属第一医院神经内科住院的患者,根据头颅磁共振检查结果入组21例非LA患者和31例轻度LA患者,使用串联质谱法采集患者23种血液氨基酸代谢物水平,比较两组患者血液氨基酸水平差异,使用Logistic回归分析模型和受试者工作特征(receiver operating characteristic,RoC)曲线研究轻度LA的独立危险因素以及血液氨基酸水平对轻度LA的筛查诊断价值。结果年龄、冠状动脉粥样硬化性心脏病史、酪氨酸和缬氨酸水平在两组间差异具有统计学意义(Pogistic回归显示,年龄(oR=1.232,95%CI:1.068~1.420)和缬氨酸水平(oR=1.059,95%CI:1.009~1.111)是轻度LA的独立危险因素,年龄增长和缬氨酸水平升高,发生轻度LA的风险增加。RoC曲线分析结果表明,年龄和缬氨酸筛查轻度LA的最佳截断值分别是58.5岁和96.305μmol/L,RoC曲线下面积分别为0.710(95%CI:0.565~0.856,P<0.05)和0.674(95%CI:0.509~0.840,P<0.05)。结论血液中常见氨基酸水平变化与早期轻度LA具有相关性,年龄增长和缬氨酸水平升高是轻度LA的独立危险因素,两者在筛查轻度LA方面具有一定的临床价值。

关键词：脑白质疏松症氨基酸缬氨酸

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Preventive Effect of an Extract of Terminalia avicennioides on Acetylcholine-Induced Tracheoconstriction in Wistar Strain Rats

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open Journal of Respiratory Diseases 2024年第2期14卷 60-68页

作者： Awa ba-Diop Ndèye Absa Diaw Ibrahima Diouf Mbaye Sène ouafae Kechaba Mamadou Sarr Modou oumy Kane Physiology Laboratory Department of Medicine Alioune Diop University of Bambey Bambey Senegal IRL3189 Environment Health Societies CNRS-UCAD Dakar Senegal Department of Physiology Laboratory Faculty of Medicine Cheikh Anta Diop University of Dakar Dakar Senegal Department of Physiology Laboratory Faculty of Medicine UFR Sante Assane SECK University of Ziguinchor Ziguinchor Senegal

Asthma is one of the most common chronic respiratory pathologies worldwide. The cost of its treatment, particularly for populations in developing countries like Senegal, requires an alternative which consists of developing research into new therapeutic approaches with the use of plants from traditional pharmacopoeia. The objective of this study was to determine whether the hydroalcoholic extract of Terminalia avicennioides leaves has a preventive effect on the constriction of tracheal smooth muscle induced by Acetylcholine in Wistar strain rats. Methods: The species used in our experiments were male Wistar rats aged between 12 and 14 weeks. Rings of rat trachea were suspended in isolated organ chambers connected to tension sensors. Two pharmacological agents were used: acetylcholine, for its constrictor effect and adrenaline, for its dilating effect on the pulmonary trachea. our plant material consisted of a hydroalcoholic extract of Terminalia avicennioides leaves. The experimental protocol was that of the preventive model which consisted of impregnating these rings with the extract at a defined concentration then testing its contractility in the presence of Acetylcholine which was the contractile agonist used in this study. The preventive effect of the extract was studied with an Acetylcholine contraction range on rings pre-incubated with Terminalia avicennioides extract. Results: The results showed that Acetylcholine contracts the trachea and the increase in its contractility was dependent on the dose of Ach added cumulatively (10−5 to 4 × 10−5 mol/l). The administration of the hydroalcoholic extract of Terminalia avicennioides leaves led to a modification of the contractile response to Acetylcholine. Indeed, this extract induced a significant attenuation of the contractile responses of the treated tracheal rings compared to those untreated. Conclusion: Terminalia avicennioides had a relaxing effect on tracheal smooth muscle and this effect

关键词： Bronchial Hyperreactivity Extract Hydroalcoholic of Terminalia Avicennioides Asthma

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Management of Acute Bowel obstruction in Adults in Ziguinchor Hospital Establishments: About 163 Cases Followed Up

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Surgical Science 2024年第4期15卷 207-218页

作者： omar Sow Cheikh H. badji Mouhamed Dieng Reymond Seydi Aissata Diallo Cheikh Diouf Papa A. ba Boubacar Fall Department of General Surgery Peace Hospital Assane Seck University of Ziguinchor Ziguinchor Senegal Department of General Surgery Central Regional Hospital of Ziguinchor Assane Seck University of Ziguinchor Ziguinchor Senegal Department of General Surgery University of Iba Der Thiam Thies Senegal

Acute intestinal obstruction represents a very frequent admission to surgical emergencies. The aim of our study was to make a descriptive analysis of the management of acute intestinal obstructions at the level of hospital establishments in Ziguinchor. Materials and Methods: This was a retrospective, descriptive, multicenter study from the period of January 1, 2017 to December 31, 2021. Patients over 15 years of age admitted for occlusive syndrome in the two surgical departments of the Ziguinchor regional hospitals were included in the study. Epidemiological, diagnostic, therapeutic and evolutionary data were studied. Results: Acute intestinal occlusions accounted for 8.3% of admissions. A total of 163 patients were enrolled, 61.9% were men, sex ratio of 1.6. The mean age was 48.7 years. The average consultation time was 74.8 hours (3.12 days). The total occlusive syndrome was in 48.5% of the cases. Abdominal pain was present in 87.1%, vomiting in 74.2%, cessation of matter and gas in 60.7% and meteorism in 36.2%. Biological lab tests reported hyperleukocytosis in 28.1% of the cases. Abdominal CT scans were performed in 71.2%, confirming the diagnosis in 90.5% and determining the etiology in 93.1%. The zone of the obstruction in the small bowel was 62.7%, and in the colon in 37.3%. Functional occlusions accounted for 22.7% of cases and mechanical for 77.3%, including 120 cases of strangulation occlusion (95.2%) and 6 cases of obstruction. Etiologies were dominated by adhesions and/or fibrous bands (61.2%). Medical treatment resolved the occlusive syndrome in 9.2% of cases, instrumental treatment in 17.1% and surgical treatment in 77.3%. Adhesiolysis/section of fibrous bands (55.7%), detorsion (14.3%) and resection anastomosis (11.9%) were the most common surgical procedures. overall morbidity was 11.6%, dominated by surgical site infection (7.14%). The mean resumption of intestinal transit was 2.7 days, and the mean hospital stay was 7.9 days. overall mortality was

关键词： Intestinal obstruction Emergency Surgery Ziguinchor

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人口较少民族聚居区保持型双语教育兴起的归因分析——以裕固族聚居区为例

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凯里学院学报 2024年第2期42卷 55-63页

作者：巴战龙北京师范大学社会学院北京100875

中国少数民族地区双语教育类型大致可分为过渡型双语教育和保持型双语教育两种,近年来在人口较少民族聚居区兴起的双语教育属于保持型双语教育。通过运用教育人类学持续观察法对裕固族聚居区的保持型双语教育的兴起进行归因分析,发现教... 详细信息

中国少数民族地区双语教育类型大致可分为过渡型双语教育和保持型双语教育两种,近年来在人口较少民族聚居区兴起的双语教育属于保持型双语教育。通过运用教育人类学持续观察法对裕固族聚居区的保持型双语教育的兴起进行归因分析,发现教育系统外部主要原因有本族语言及传统文化趋于濒危和族群性的焦虑加剧,以及可供社会行动者选择的实践策略空间在相关政策叠加实施的背景中生成和拓展;教育系统内部的主要原因有校本课程开发的蓬勃兴起和民族文化精英的强力推动。从当下中国的经验事实和情境分析来看,“完善差别化的区域政策”可以作为新时代少数民族地区双语教育政策的基本定位和主导逻辑。

关键词：人口较少民族裕固族双语教育教育人类学

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自然口语中“确实”的话语功能和人际功能

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世界华文教学 2024年第1期 241-259页

作者：巴丹苏州城市学院

本文运用话语分析理论,从话语功能和人际功能两个方面研究副词“确实”。口语中“确实”具有延续话题、应答标记、话题前景化以及拟对话等话语功能。“确实”的人际功能有:礼貌原则的具体体现、话语指向的精确定位、话轮持有权的实现。... 详细信息

本文运用话语分析理论,从话语功能和人际功能两个方面研究副词“确实”。口语中“确实”具有延续话题、应答标记、话题前景化以及拟对话等话语功能。“确实”的人际功能有:礼貌原则的具体体现、话语指向的精确定位、话轮持有权的实现。“确实”从说话人的立场出发,传递出说话人主观肯定的态度。具有保全会话人面子,尽量达成言谈双方共识,从而在友好、和谐的交谈氛围中实现交际语用目的的功能。

关键词：副词确实口语衔接

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