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Characterization of Sediment from Ourokessoum, North Cameroon: Morphostructural, Mineralogical, and Physicochemical Properties

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Journal of Geoscience and Environment Protection 2024年第9期12卷 51-76页

作者： Atangana Jacqueline Ntsama Kadaguina Doussana Joseph Roland Atenga Essama Akoa philémon Rémi Etoundi Bilobi Roland Touna Jean Pierre Nguetnkam Department of Earth Sciences Faculty of Science University of Yaound I Yaound Cameroon Department of Earth Sciences Faculty of Science University of Ngaoundere Ngaoundr Cameroon College of Civil Engineering and Architecture China Three Gorges University Yichang China Department of Mining Geology School of Geology and Mining Engineering University of Ngaoundere Meiganga Cameroon

The present study examines the morphological, physicochemical, and mineralogical specificity of clay sediments in the Hamakoussou Basin with the objective of exploring their potential applications. Field data collection was followed by a series of physicochemical and mineralogical tests on the clay samples. Results show that the clay layers, which range in thickness from 11 - 120 cm, exhibit gray, yellowish, or greenish colors. From a physicochemical perspective, these clay layers are found to be basic with a pH ranging from 8.5 for the higher Hama2 layer to 7.6 for the lower Hama1 layer. The sum of exchangeable bases (S) is medium to high with higher values in the Hama1 layer (53.45 meq/100g) and lower values in the Hama3 layer (17.09 meq/100g). Similarly, the cation exchange capacity (CEC) varies from 62.32 meq/100g for the higher Hama1N4 clay layer to 35.6 meq/100g for the lower Hama1N3 clay layer. Mineralogically, the clay materials are primarily composed of smectites, with illite, kaolinite, calcite, quartz, feldspar, hematite, and goethite also present. This study emphasizes the versatility of clay in various industries and scientific domains. It is known for its impermeability, plasticity, and fossil-preserving capabilities, making it a valuable material for economic, practical, and academic applications.

关键词： Morphostructural Sediments Clay Layers Sedimentary Basin Hamakoussou

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Ceramic Properties of Three Specimens of Alluvial Clays Used in Local Constructions from Mbouda Clay Deposit, West Cameroon

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Journal of Minerals and Materials Characterization and Engineering 2024年第5期12卷 265-279页

作者： philémon Zo’o Zame Sylvain Kouayep Lawou philippe Samba Assomo Audrey Erman Moutsou Yannick Lontchi Dzoti Véronique Kamgang Kabeyene Beyala Faculty of Science University of Yaound I Yaound Cameroon Higher Teacher Training College Bertoua University of Bertoua Bertoua Cameroon Faculty of Science University of Dschang Dschang Cameroon

The Mbouda alluvial deposit is located at the foot of the Bamboutos mountains (West Cameroon) where three types of clayey materials are widespread. The populations collect these clays in their natural state in view of constructions using fired bricks or compressed blocks. Unfortunately, these buildings are not strong. This study investigates the causes of the strengthlessness of buildings and suggests solutions to overcome the difficulty. The research content includes field and laboratory studies. The methodology consists of sampling black (AN), white (AB) and red (AR) clays specimens identified in the study area and analysing them simultaneously at MIPROMALO (Cameroon) and at ACME LAB in Vancouver (Canada). The results obtained show a high sand content in the samples AN (64%), AB (55.2%), AR (30.9%). The compressive strength of the built specimens is low at 900˚C considered as the traditional firing temperature AN (0.94 MPa), AB (5.25 MPa), AR (2.18 MPa). The mineralogical series are identically made by kaolinite, chlorite, gibbsite, quartz, muscovite, biotite, goethite, magnetite and hematite. Silica (SiO2) presents higher contents AN (52.87%), AB (48.02%), AR (47.68%) followed by alumina (Al2O3) AN (29.96%), AB (28.13%), AR (24.72%). The other elements are poorly represented.

关键词： Sand Bricks Clays Mechanical Properties Local Constructions

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Ballistic transport and quantum interference in InSb nanowire devices

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Chinese Physics B 2017年第2期26卷 435-440页

作者： Sen Li Guang-Yao Huang Jing-Kun Guo Ning Kang phil.ppe.caroff Hong-Qi Xu Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics Peking University Beijing 100871 China Department of Electronic Materials Engineering Research School of Physics and EngineeringThe Australian National University Canberra ACT 0200 Australia Institute of Electronics Microelectronics and Nanotechnology CNRS-UMR 8520 Avenue Poincar6 C. S. 60069 59652 Villeneuve d'Ascq France

An experimental realization of a ballistic superconductor proximitized semiconductor nanowire device is a necessary step towards engineering topological quantum electronics. Here, we report on ballistic transport in In Sb nanowires grown by molecular-beam epitaxy contacted by superconductor electrodes. At an elevated temperature, clear conductance plateaus are observed at zero magnetic field and in agreement with calculations based on the Landauer formula. At lower temperature, we have observed characteristic Fabry–Pérot patterns which confirm the ballistic nature of charge ***, the magnetoconductance measurements in the ballistic regime reveal a periodic variation related to the Fabry–Pérot oscillations. The result can be reasonably explained by taking into account the impact of magnetic field on the phase of ballistic electron＇s wave function, which is further verified by our simulation. Our results pave the way for better understanding of the quantum interference effects on the transport properties of In Sb nanowires in the ballistic regime as well as developing of novel device for topological quantum computations.

关键词： InSb nanowire ballistic transport quantum interference

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沙漠战士角蜥泣血而战的御敌艺术家

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环球人文地理 2024年第3期 74-81页

作者：鲨鲨 David McGowen vaclav Scott rodphotography Ted Dale qingwa phil and Karen flickr

关键时刻能用眼睛喷出身体三分之一的血量，静止、伪装、膨胀……得克萨斯州的小小角蜥如同沙漠中的八边形战士，不舍昼夜地研究如何御敌。在长期的生存竞争中，动物们演化出了形形色色的逃生技巧。比如蟾蜍自爆求存，蚂蚁自杀式爆炸袭...

关键时刻能用眼睛喷出身体三分之一的血量，静止、伪装、膨胀……得克萨斯州的小小角蜥如同沙漠中的八边形战士，不舍昼夜地研究如何御敌。在长期的生存竞争中，动物们演化出了形形色色的逃生技巧。比如蟾蜍自爆求存，蚂蚁自杀式爆炸袭击……而最令人惊奇的，则是角蜥的喷血御敌。

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The Use of Far Infrared Treatment Prior to Exercise in Horses: An mfBIA and Acoustic Myography Three Case Study

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Open Journal of Veterinary Medicine（兽医学） 2024年第4期 69页

作者： Adrian Harrison D.phil

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Tunnel junctions in a III-V nanowire by surface engineering

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Nano Research 2015年第3期8卷 980-989页

作者： Salman Nadar Chloe Rolland Jean-Frangois Lampin Xavier Wallart phil.ppe.caroff Renaud Leturcq Institute of Electronics Microelectronics and Nanotechnology CNRS-UMR 8520 ISEN Department Avenue Poincare CS 60069 59652 Villeneuve d'Ascq Cedex France Department of Electronic Materials Engineering Research School of Physics and Engineering The Australian National University Canberra ACT0200 Australia Departement Science et Analyse des Mat~riaux Centre de Recherche Public-Gabriel Lippmann 41 rue du Brill L-4422 Belvaux Luxembourg

We demonstrate a simple way of fabricating high performance tunnel devices from p-doped InAs nanowires by tailoring the n-doped surface accumulation layer inherent to InAs surfaces. By using appropriate ammonium sulfide based surface passivation before metallization without any further thermal treatment, we demonstrate characteristics of tunnel p-n junctions, namely Esaki and backward diodes, with figures of merit better than previously published for InAs homojunctions. The further optimization of both the surface doping, in a quantitative way, and the device geometry allows us to demonstrate that these nanowire-based technologically-simple diodes have promising direct current characteristics for integrated high frequency detection or generation.

关键词： semiconductor nanowire tunnel junction indium arsenidecompounds doping Ⅲ-Ⅴ semiconductors

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Detecting Inhomogeneity in Daily Climate Series Using Wavelet Analysis

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Advances in Atmospheric Sciences 2008年第2期25卷 157-163页

作者：严中伟 phil D.JONES Laboratory of Regional Climate and Environment for Temperate East Asia Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 Climatic Research Unit University of East Anglia Norwich NR4 7TJ United Kingdom

A wavelet method was applied to detect inhomogeneities in daily meteorological series, data which are being increasingly applied in studies of climate extremes. The wavelet method has been applied to a few well- established long-term daily temperature series back to the 18th century, which have been ＂homogenized＂ with conventional approaches. Various types of problems remaining in the series were revealed with the wavelet method. Their influences on analyses of change in climate extremes are discussed. The results have importance for understanding issues in conventional climate data processing and for development of improved methods of homogenization in order to improve analysis of climate extremes based on daily data.

关键词： inhomogeneity daily meteorological observation wavelet analysis climate extremes

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Catatonia:“Fluctuat nec mergitur”

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World Journal of Psychiatry 2023年第5期13卷 131-137页

作者： Gabor S Ungvari Stanley N caroff Levente Csihi Gábor Gazdag Division of Psychiatry School of MedicineUniversity of Western AustraliaCrawley 6009Western AustraliaAustralia Section of Psychiatry University of Notre DameFremantle 6160Western AustraliaAustralia Department of Psychiatric Service Corporal Michael J Cresencz Veterans Affairs Medical CenterPhiladelphiaPA 19104United Department of Psychiatric Service University of Pennsylvania Perelman School of MedicinePhiladelphiaPA 19104United States Department of Psychiatry and Psychiatric Rehabilitation Jahn Ferenc South Pest HospitalBudapest 1204Hungary Department of Psychiatry and Psychotherapy Faculty of MedicineSemmelweis UniversityBudapest 1083Hungary

In the beginning of the 1900s,the prevalence of catatonia in inpatient samples was reported to be between 19.5%and 50%.From the mid-1900s,most clinicians thought that catatonia was *** in medical sciences,particularly in the field of neurology,may have reduced the incidence of neurological diseases that present with catatonic features or mitigated their *** active pharmacological and psychosocial treatment methods may have either eliminated or moderated catatonic ***,the relatively narrow descriptive features in modern classifications compared with classical texts and ascribing catatonic signs and symptoms to antipsychotic-induced motor symptoms may have contributed to an apparent decline in the incidence of *** application of catatonia rating scales introduced in the 1990s revealed significantly more symptoms than routine clinical interviews,and within a few years,the notion of the disappearance of catatonia gave way to its unexpected *** systematic investigations have found that,on average,10%of acute psychotic patients present with catatonic *** this editorial,the changes in the incidence of catatonia and the possible underlying causes are reviewed.

关键词： routine eliminated narrow

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蟹状星云前世今生

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环球科学 2024年第5期 86-89页

作者：菲尔·普莱赵剑琳(译) 不详

蟹状星云是有史以来最为著名的超新星遗迹,如今,韦布空间望远镜或能揭示它的起源。大约在969年前,准确来说是1054年7月,一次超新星爆发——宇宙中能量最强、最剧烈的事件之一,它是恒星在演化末期经历的一种剧烈的爆炸——产生的光到达... 详细信息

蟹状星云是有史以来最为著名的超新星遗迹,如今,韦布空间望远镜或能揭示它的起源。大约在969年前,准确来说是1054年7月,一次超新星爆发——宇宙中能量最强、最剧烈的事件之一,它是恒星在演化末期经历的一种剧烈的爆炸——产生的光到达了地球。

关键词：蟹状星云超新星爆发超新星遗迹空间望远镜前世今生恒星宇宙

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The Black-winged Monarch(Monarcha frater):Geographic variation,taxonomy,a"new"population,and an enduring mystery in migration

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Avian Research 2023年第3期14卷 467-477页

作者： Leo Joseph Julian Teh Paul Sweet phil Gregory Australian National Wildlife Collection CSIRO National Research Collections AustraliaCanberra2601Australia American Museum of Natural History New YorkUSA Sicklebill Safaris TopazQueensland4885Australia

The Black-winged Monarch(Monarcha frater)inhabits low-mid elevation forests across New Guinea and far northeastern *** its four recognized subspecies,*** is migratory,breeding in tropical north-eastern Australia from approximately November–*** non-breeding range of ***,apart from some individuals overwintering in Australia,has been unknown for>100 *** from 194 New Guinean and Australian specimens and a literature review have not solved this mystery;the narrow latitudinal range of the intratropical migration may inhibit use of GPS loggers in resolving the migration *** work in central and western parts of southern New Guinea is *** data,however,revealed an essentially overlooked population in north-western New Guinea east of the Bird's Head Peninsula phenotypically indistinguishable from nominate *** of that *** genomic analysis of the complex will be largely done from toepad skin because frozen tissue samples for DNA analysis exist only of four individuals of what we suggest should be elevated to species rank as *** discuss how genomic analysis might distinguish among alternative taxonomic hypotheses of one,two or three *** suggest English names for what we consider to be three diagnosable taxa worth recognizing at species rank in this group:Arfak Monarch corresponding to ***(Bird's Head Peninsula and the“new”population of north-western New Guinea);Pearly Monarch for ***(Australia and still unknown non-breeding range),and Masked Monarch for ***(including kunupi,elsewhere in New Guinea).

关键词： Australia Migration monarch flycatcher Monarcha frater New Guinea Taxonomy

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