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Mobility of Major and Trace Elements during the Bauxitization Processes in Ngaoundal Area (Adamawa Cameroon): Implication on Mining Perspectives
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作者 André Sini Harouna Boukari +4 位作者 Ondoa Augustin Désiré Balla Djetenbe Beral Salomon Wangmené Awé Simon Djakba Basga Jean Pierre Nguetnkam 《Open Journal of Geology》 CAS 2024年第1期81-100,共20页
This study was focused to assess major and trace elements in bauxitic duricrusts from Ngaoundal and its surroundings in order to establish their mining interest. To this end, fieldworks, mineralogical and geochemical ... This study was focused to assess major and trace elements in bauxitic duricrusts from Ngaoundal and its surroundings in order to establish their mining interest. To this end, fieldworks, mineralogical and geochemical analyses were carried out. Four facies of duricrust were identified and characterized from the summit to the top of the slope of the Ngaoundal mountain: scoriaceous, pisolitic, nodular and massive. Mineralogical and geochemical analyses performed on 16 samples, revealed a significant concentration of Al<sub>2</sub>O<sub>3</sub> mainly in the scoriaceous facies (over 45% in grade), moderate in Fe<sub>2</sub>O<sub>3</sub> (averaging 23.69%) and SiO<sub>2</sub> (averaging 21.7%). Trace elements were generally low, excluding Cr (421 ppm on average), Zr (327 ppm on average and V (213 ppm on average). In addition, the limited quantities of alkalis (Na<sub>2</sub>O, K<sub>2</sub>O) and alkaline earths metals (MgO, CaO) coupled with the very high values of Chemical Index of Alteration (CIA) and Mineralogical Index of Alteration (MIA), (more than 99%) attest to the intense weathering of the studied materials. Allitization and monosiallitization constituted the crystallochemical phenomena that have led to the development of bauxitic minerals. More than 90% of gibbsite in scoriaceous facies, 52.21% - 76.01% of kaolinite in pisolitic facies and more than 40% of hematite in nodular facies were quantified. The relationships between the constitutive components indicated their interdependency during the bauxitization phenomenon. The mineralogical and geochemical properties highlighted the mining interest of the studied duricrusts to be valorized. 展开更多
关键词 Duricrust Bauxitization Phenomenon Mineralogical and Geochemical Characterization major and Trace Elements Mining Potential
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Usefulness of the Surgical Apgar Score to Predict the Occurrence of Major Complications in the Early Post-Operative Period of Major Surgeries: Experience of Two Second-Category Hospitals in Cameroon
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作者 Charles Emmanuel Toussaint Binam Bikoi Francis Ateba Ndongo +2 位作者 Serge Vivier Nga Nomo Édouard Léa Mekoui Ze Fidèle Binam 《Open Journal of Anesthesiology》 2024年第3期51-65,共15页
Objective: The Surgical Apgar Score (SAS) is a tool for intraoperative stratification of the risk of serious complications in the early postoperative period. It varies from 0 to 10 points divided into three risk categ... Objective: The Surgical Apgar Score (SAS) is a tool for intraoperative stratification of the risk of serious complications in the early postoperative period. It varies from 0 to 10 points divided into three risk categories (0 to 4 high, 5 to 7 moderate, 8 to 10 low). The aim of the study was to evaluate its relevance in predicting the appearance of these complications. Material and methods: This descriptive and analytical study was carried out at the “Laquintinie” Hospital in Douala and at the Central Hospital in Yaounde, Cameroon. The main data were collected on a population of patients over 18 years old and recorded on a survey form. They consisted of variables of main interest and exposure variables. Univariate and multivariate statistical analysis using top-down logistic regression models made it possible to evaluate the association of each variable of main interest and each exposure variable. The association was significant at P Results: Of the 88 patients studied, the SAS was 3 hours. In multivariate, this link persisted only and strongly for the SAS OR (IC) 0.1 (0.1 - 0.2) and p = 000. Conclusion: The study found a specific and powerful link between the SAS score < 4 and the occurrence of complications in the early postoperative period, in favor of its relevance in predicting them. 展开更多
关键词 Early Postoperative Complications major Surgeries Surgical Apgar Score
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Major Ions in Atmospheric Deposition in Lake Kivu Basin
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作者 Mashimango Bagalwa Jackson Gilbert Mwanjalolo Majaliwa +2 位作者 Katcho Karume Sarah Akello Frank Kansiime 《Journal of Environmental Protection》 CAS 2023年第3期185-205,共21页
This study investigated the major ion composition and sources in wet and dry deposition samples collected over 15 months (December 2017 to February 2019) at four stations representing four different land use/cover typ... This study investigated the major ion composition and sources in wet and dry deposition samples collected over 15 months (December 2017 to February 2019) at four stations representing four different land use/cover types on the western side of Lake Kivu basin in D.R. Congo. The samples were collected every 13 days for dry deposition and two to three times per month for wet deposition. Samples were analyzed for major ionic components (Cl<sup>-, NO<sub>-</sub>3</sup>, SO<sub>2-</sub>4</sup>, Na<sup>+</sup>, K<sup>+</sup>, NH<sub>+</sub>4</sup>, Ca<sup>2+</sup>, CO<sub>2-</sub>3</sup>, HCO<sub>-</sub>3</sup> and Mg<sup>2+</sup>). Electrical conductivity and pH were analyzed immediately in the field while major ion measurements were in the laboratory. Results showed the pH of both the dry and the wet depositions were higher than what would have been expected based on equilibration with atmospheric CO<sub>2</sub> (pH > 5.6) at all four sites, with conductivity less than 50 μS/cm. The neutralization process in dry and wet atmospheric deposition is due to Ca<sup>2+</sup>, NH<sub>+</sub>4</sup>, HCO<sub>-</sub>3</sup> and CO<sub>2-</sub>3</sup>. The anion: cation ratio in dry deposition was close to 1 for Iko and Bukavu, and it was greater than 1.0 (1.1 - 1.2) for Lwiro and Goma in wet deposition. The dominant anions in wet deposition were SO<sub>2-</sub>4</sup> and NO<sub>-</sub>3</sup>, found around the rural area near cement factory and the urban area near active volcanoes, respectively. The most abundant cation was Na+ followed by K<sup>+</sup>. The enrichment factors and correlation analysis suggest that the main sources of Ca<sup>2+</sup>, Na<sup>+</sup> and Mg<sup>2+</sup> were disintegration of soil processes, aeolian suspension of soil and volcanic ash, biomass burning and the cement/lime factory around the Lake Kivu basin. 展开更多
关键词 Dry and Wet Deposition major Ions Lake Kivu
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Self-Frustration of Expectations in Major Depressive Disorder: The Syncytiopathy Hypothesis of Depression Revisited
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作者 Bernhard J. Mitterauer 《Advances in Bioscience and Biotechnology》 2023年第12期534-544,共11页
This paper is a further elaboration of my model of the pathophysiology of major depressive disorder focusing on imbalances of glial-neuronal interactions in tripartite synapses and the glial network (syncytium). Basic... This paper is a further elaboration of my model of the pathophysiology of major depressive disorder focusing on imbalances of glial-neuronal interactions in tripartite synapses and the glial network (syncytium). Basically, it is proposed that the connexin proteins building gap junctions in the glial syncytium are underexpressed or dysfunctional in major depression, called syncytiopathy. As a compensatory effect the astrocytic receptors in tripartite synapses are overexpressed. This leads to protracted synaptic information processing because of a relative lack of neurotransmitter substances for the occupancy of astrocytic receptors. Based on a new biophysical formal description of astrocytic receptors as expectation variables it can be shown that the protracted processing of sensory information frustrate the full comprehension of the expected event, since it cannot be grasped in time. Moreover, expectation frustration may stress the glial syncytium aggravating memory impairment. This cyclic process of dysbalanced synaptic information processing is characterized as self-frustration of expectations explanatory for the main cognitive dysfunctions in major depression as slowing down processing speed, deficits in attention and working memory. The main result of the study is that patients with major depression cannot fully acknowledge the existence of an intended event. 展开更多
关键词 major Depression Glial Syncytiopathy Protracted Information Processing Self-Frustration of Expectations Cognitive Impairment
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Isolated Major Aortopulmonary Collateral Artery Causing Heart Failure: Transcatheter Occlusion of Mapcas Using Amplatzer Vascular Plugs and Amplatzer Piccolo Occluders
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作者 Vakhtang Khelashvili Iuri Fkhkadze +1 位作者 Tengiz Shiryaev Omar Gogia 《World Journal of Cardiovascular Diseases》 2023年第11期701-709,共9页
Major aortopulmonary collateral arteries (MAPCAs) are congenital vessels that arise from the aorta or its first-order branches and are distally connected to the pulmonary arterial vasculature, thereby providing pulmon... Major aortopulmonary collateral arteries (MAPCAs) are congenital vessels that arise from the aorta or its first-order branches and are distally connected to the pulmonary arterial vasculature, thereby providing pulmonary blood flow. MAPCAs are often associated with cyanotic congenital heart disease with decreased pulmonary blood flow. Isolated MAPCAs are rare in patients without congenital heart disease with structurally normal hearts. Sometimes, isolated congenital MAPCAs can occur without any lung disease. Isolated MAPCAs represent the occurrence of collaterals in the absence of underlying heart disease, which commonly presents as heart failure, recurrent respiratory tract infection, and pulmonary artery hypertension. We report a rare case of congestive heart failure in a 6-year-old patient with dual arterial supply to an otherwise normal right lung, with a normal bronchial tree, and a structurally normal heart. The patient was successfully managed by the closure of collaterals by Amplatzer vascular plugs II (AVPII) and Amplatzer Piccolo Occluders. 展开更多
关键词 Isolated major Aortopulmonary Collateral Artery Amplatzer Vascular Plugs Amplatzer Piccolo Occluder Mapcas Transcatheter Closure
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Major Ear Aplasia and Cochleovestibular Dysplasia: Rare Congenital Malformation about a Case
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作者 Mouangue-Mbonjo Louise Epée Ngoué Jeannette +1 位作者 Mantho Fopa Pauline Njifou Njimah Amadou 《International Journal of Otolaryngology and Head & Neck Surgery》 2023年第6期397-404,共8页
Introduction: The congenital malformations of the ear are rare and often isolated, may be unilateral or bilateral, and can be associated with another syndromic malformation. Such malformations so not necessarily impac... Introduction: The congenital malformations of the ear are rare and often isolated, may be unilateral or bilateral, and can be associated with another syndromic malformation. Such malformations so not necessarily impact aesthetics and social relations. Case Presentation: The authors report the case of Samuel M, male born at 38 WA, who is the first child of healthy parents from the same socio-cultural area. His birth weight was 2800 g and he did not have any risk factors for deafness or concept of obstetrical trauma. He presented with congenital malformation manifesting as bilateral ear aplasia with unilateral facial paralysis. Computed tomography revealed abnormalities of the inner ear;functional explorations, such as PEA and OEA, showed findings in favor of bilateral cophosis. ASSR (Auditory Steady-State Responses) was not performed. The announcement of the serious diagnosis of deafness requires multidisciplinary care in order to plan a therapeutic program to limit the impact on the development of language, schooling, and consequently, the socio-professional future of children. Conclusion: This clinical case underlines the fact that interest of the clinical interview before possible multiple surgery does not always guarantee the satisfaction of the desire for repair in this type of patient. 展开更多
关键词 Ear Malformations Congenital Malformations major Aplasia Congenital Facial Paralysis Congenital Deaf-Mutism
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不同氨基酸组合对真鲷(Chrysophrys major)诱食效果的研究 被引量:5
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作者 胡水鑫 王骥腾 +4 位作者 韩涛 王浩 蔡峰雄 王晨露 路冰岩 《饲料工业》 北大核心 2011年第12期18-20,共3页
试验以真鲷为试验对象,采用迷宫法,以丙氨酸、甘氨酸、精氨酸和组氨酸作为诱食剂原料,经不同组合后测定其对真鲷的诱食效果。结果显示,甘氨酸+组氨酸的诱食效果最好,其各种组合的诱食效果依次为甘氨酸+组氨酸>甘氨酸+丙氨酸>甘氨... 试验以真鲷为试验对象,采用迷宫法,以丙氨酸、甘氨酸、精氨酸和组氨酸作为诱食剂原料,经不同组合后测定其对真鲷的诱食效果。结果显示,甘氨酸+组氨酸的诱食效果最好,其各种组合的诱食效果依次为甘氨酸+组氨酸>甘氨酸+丙氨酸>甘氨酸>组氨酸>丙氨酸>丙氨酸+精氨酸>丙氨酸+甘氨酸+组氨酸>精氨酸+组氨酸>甘氨酸+精氨酸>甘氨酸+丙氨酸+精氨酸>丙氨酸+组氨酸>精氨酸>丙氨酸+精氨酸+组氨酸>甘氨酸+丙氨酸+精氨酸+组氨酸。 展开更多
关键词 真鲷(Chrysophrys major) 氨基酸 诱食
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基于CNFET的三输入Majority门电路设计 被引量:3
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作者 汪扬杰 夏银水 《无线通信技术》 2018年第2期57-62,共6页
Majority(MAJ)运算和反相(INV)运算组成完备集,数字逻辑电路可以用基于"MAJ/INV"的MI(Majority-Inverter)逻辑来实现。三输入MAJ门是MI逻辑电路的一种基本门电路单元。本文设计了一种基于碳纳米管场效应晶体管(Carbon Nanotub... Majority(MAJ)运算和反相(INV)运算组成完备集,数字逻辑电路可以用基于"MAJ/INV"的MI(Majority-Inverter)逻辑来实现。三输入MAJ门是MI逻辑电路的一种基本门电路单元。本文设计了一种基于碳纳米管场效应晶体管(Carbon Nanotube Field Effect Transistor,CNFET)的三输入MAJ门电路,并用所设计的MAJ门实现三个多输入组合逻辑电路。实验结果表明,在采用相同的器件和工艺的条件下,与现有的设计相比,所设计的MAJ门在功耗和功耗延时积上的改进最高分别达到32.5%和45.3%。 展开更多
关键词 majority-Inverter逻辑 majority门 碳纳米场效应晶体管 功耗 功耗延时积
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Current Status of Oral English in Non-English Major Teaching in China 被引量:1
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作者 韩宁 《内蒙古师范大学学报(哲学社会科学版)》 2001年第S1期159-161,共3页
It is out of the question that oral English is very important in non English major teaching and learning in China. But drawing on a series of investigation and evaluation, the article uncovers that in fact the importa... It is out of the question that oral English is very important in non English major teaching and learning in China. But drawing on a series of investigation and evaluation, the article uncovers that in fact the importance oral English is overlooked presently in a number of Chinese universities. After analyzing the underlying causes, the author presents us with some tentative solutions to the problems. 展开更多
关键词 oral English non English major SPEAKING
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Research into the Application of Cooperative Learning to English Reading Teaching of Art Majors in Independent Colleges 被引量:1
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作者 李张燕 《海外英语》 2018年第13期236-239,共4页
This paper first stated some related theories of cooperative learning and English reading teaching.And then an applicationof cooperative learning in English reading teaching of art majors in independent college is imp... This paper first stated some related theories of cooperative learning and English reading teaching.And then an applicationof cooperative learning in English reading teaching of art majors in independent college is implemented based on these literature re-views.The aim of the experiment is to explore the impact of the application of cooperative learning strategies.It mainly discussedthe following questions:(1)Can the group cooperative learning improve students'reading achievement?(2)What factors contributeto the success/failure of cooperative learning?(3)What are the favorite cooperative learning models in reading classes?The experi-ment proved that cooperative learning does not truly improve art students’reading achievement in independent college,but it real-ly has a positive role in promoting the students'learning interest,motivation and emotional attitude.The experiment also indicatesthat cooperative learning is still a valuable teaching strategy for applying,and GI,LT,TGT and other cooperative learning modelare welcomed by classmates. 展开更多
关键词 INDEPENDENT COLLEGE ART majors COOPERATIVE Learning English READING Teaching
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Whole Person Education of English Majors through English Public Speaking
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作者 王玉明 王晨 +2 位作者 吴闻博 陈文娟 何倩倩 《海外英语》 2015年第4期125-127,共3页
English public speaking proves to play a significant role in the speaker's whole person education, which has been gaining increasing attention among scholars at home and abroad. The paper analyzes possible relatio... English public speaking proves to play a significant role in the speaker's whole person education, which has been gaining increasing attention among scholars at home and abroad. The paper analyzes possible relations between them and argues that great importance and awareness are supposed to be attached to the development and promotion of English public speaking especially among English majors for them to be more versatile and more competitive both in job markets and in work places. 展开更多
关键词 WHOLE PERSON EDUCATION ENGLISH majors ENGLISH public SPEAKING
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The Application of Metacognitive Strategies in PE & Art Majors'College English Reading Practice
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作者 韦艳梅 雷彩 覃晓琪 《海外英语》 2013年第12X期5-7,共3页
During the active process of reading, strategies involved will affect the process of reading comprehension, and the reader should intentionally regulate and control the reading process and adopt appropriate strategies... During the active process of reading, strategies involved will affect the process of reading comprehension, and the reader should intentionally regulate and control the reading process and adopt appropriate strategies to solve the problems during it. The purpose of this paper is to determine the use of metacognitive strategies in reading by the PE & Art majors through questionnaire. According to the result of the questionnaire, the PE & Art majors do use some metacognitive strategies in their reading, while nearly half of them do not often use metacognitive strategies in their reading. For this phenomenon, the author gives some constructive suggestions for the English majors about how to apply the metacognitive strategies in their reading: 1) preparing and planning in pre-reading; 2) monitoring and self-questioning in while-reading; 3) evaluating and adjusting in post-reading. 展开更多
关键词 METACOGNITION metacognitive STRATEGIES READING the ENGLISH majors
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Research on the special role of career planning in accelerating the efficiency of regular teaching for English major students
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作者 周王宏 苏丽 《海外英语》 2011年第14期391-392,共2页
The teaching contents of English major need to be designed flexibly with revolving around career planning as it is helpful for teachers to acquire creative thoughts and ideas in teaching.Especially,this can surely gua... The teaching contents of English major need to be designed flexibly with revolving around career planning as it is helpful for teachers to acquire creative thoughts and ideas in teaching.Especially,this can surely guarantee the remarkable efficiency of English major teaching. 展开更多
关键词 CAREER planning REGULAR TEACHING English major EFFICIENCY
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A Study on Attitude to Western Culture of English Majors and Non-English Majors
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作者 王莉 《海外英语》 2013年第20期66-67,75,共3页
With different learning purposes and environment, the attitude to western culture of English majors and non-English majors is hypothetically different. But after the study conducted with the method of questionnaire, t... With different learning purposes and environment, the attitude to western culture of English majors and non-English majors is hypothetically different. But after the study conducted with the method of questionnaire, the hypothesis is proved to be wrong. Thus, the writer analyses the reasons for the problem and suggests the pedagogic practice. 展开更多
关键词 ATTITUDE WESTERN CULTURE ENGLISH majors non-Englis
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English Learning Styles and English Achievements of Students Majoring in P.E.,Art and Music
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作者 蒋会 《海外英语》 2012年第9X期281-282,共2页
Learning styles are considered as an important individual difference of affecting learning efficiency and English achievements.This research focuses on the sophomores whose majors are Physical Education (P.E.),Art and... Learning styles are considered as an important individual difference of affecting learning efficiency and English achievements.This research focuses on the sophomores whose majors are Physical Education (P.E.),Art and Music (P.A.M.students) in Yangtze Normal University to investigate into total learning styles,the relationships concerning major,English achievement respectively with learning styles.The results show that participants prefer group learning style rather than auditory learning style;there is no possible links between learning styles and their majors,and English achievements. 展开更多
关键词 LEARNING STYLE majors ENGLISH ACHIEVEMENTS
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Research on Avoidance Behavior in the English Writing of English Majors
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作者 崔金枝 《海外英语》 2018年第21期242-244,共3页
This thesis conducts a study of avoidance phenomenon in the English writing of English majors in Shandong University ofTechnology. Instruments used in the study are 180 English writing samples of the 2 ndgrade English... This thesis conducts a study of avoidance phenomenon in the English writing of English majors in Shandong University ofTechnology. Instruments used in the study are 180 English writing samples of the 2 ndgrade English majors, questionnaires and in-terviews. Based on the data collected, different kinds of avoidance are analyzed. Further, reasons behind avoidance are exploredand corresponding implications are given. 展开更多
关键词 AVOIDANCE ENGLISH WRITING ENGLISH majors
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Where is English Majors' Future?-A Revelation from Japan Earthquake Dialogue and Michael Dell's Success Story
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作者 龙艳霞 《海外英语》 2011年第8X期392-393,共2页
With an English program Dialogue about Japan earthquake, it is found that English major's future is pale and gloomy. It's just like Michael Dell's success story, when people found direct marketing is a bet... With an English program Dialogue about Japan earthquake, it is found that English major's future is pale and gloomy. It's just like Michael Dell's success story, when people found direct marketing is a better way, they would try to get dealers out of the way. English majors are facing the embarrass like dealers. 展开更多
关键词 English major Japan earthquake MICHAEL DELL dealers
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On English Vocabulary Teaching of Non-English Major Students
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作者 谭莉 《海外英语》 2018年第18期250-251,共2页
Non-English major students often feel frustrated in learning English vocabulary by rote memorization. Meanwhile, as thebasis of understanding and expressing language, vocabulary is vital to the smooth development of c... Non-English major students often feel frustrated in learning English vocabulary by rote memorization. Meanwhile, as thebasis of understanding and expressing language, vocabulary is vital to the smooth development of college English teaching reformsand the comprehensive improvement of students' English level. Therefore, it's necessary for college English teachers to researchthe rules of vocabulary teaching and give indispensable guidance to students. 展开更多
关键词 ENGLISH VOCABULARY STUDY NON-ENGLISH major STUDENTS
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An Investigation of English Reading Strategies among Art majors in Hubei University ZhiXing College
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作者 刘磊 《海外英语》 2012年第2X期110-111,共2页
Many researches have proven that reading strategies play a vital role in English reading processes and have a crucial influence on reading results. However, at present there are few studies focused on art major studen... Many researches have proven that reading strategies play a vital role in English reading processes and have a crucial influence on reading results. However, at present there are few studies focused on art major students' reading strategy use status quo, especially the researches on art major students in independent college are fewer. This thesis based on the existing reading strategy research, tries to discuss the characteristics of art major students' English reading strategy use and further analyzes the factors that influence the choosing of reading strategies among art major students in Hubei University Zhixing College which is an independent college in Wuhan city Hubei Province.Based on the investigation results and survey results of the interview, this thesis presents some reading strategy teaching strategies for improving English language reading strategy teaching: 展开更多
关键词 ART majors ENGLISH READING STRATEGIES influential
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College English Grammar Teaching for Non-English Majors
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作者 刘俊丽 《海外英语》 2010年第11X期509-509,518,共2页
Grammar is very important in language learning. The mastery of English grammar is the basic English skill. However,most non-English majors are relatively poor in English and English grammar. They think grammar learnin... Grammar is very important in language learning. The mastery of English grammar is the basic English skill. However,most non-English majors are relatively poor in English and English grammar. They think grammar learning is boring and have a negative attitude towards grammar. So,it's necessary and urgent to teach them grammar. 展开更多
关键词 English learning GRAMMAR TEACHING NON-ENGLISH majors
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