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Assessment of Groundwater Quality for Domestic and Irrigation Purposes in Northern Bamenda (Cameroon)

Journal of Water Resource and Protection 2021年第1期13卷 1-19页

作者： Alice Magha Margaret Tita Awah gus Djibril Kouankap Nono Primus Azinwi Tamfuh Pierre Wotchoko Mercy Adoh Veronique Beyala Kamgang Kabeyene Department of Geology Higher Teacher Training College University of Bamenda Bambili Cameroon Department of Biology Higher Teacher Training College University of Bamenda Bambili Cameroon Department of Soil Science Faculty of Agronomy and Agricultural Sciences University of Dschang Dschang Cameroon Department of Mining and Mineral Engineering National Higher Polytechnic Institute University of Bamenda Bambili Cameroon Department of Earth Sciences Higher Teacher Training College University of Ngaoundere Bertoua Cameroon

Safe and reliable drinking water availability constitutes a nightmare in many towns of developing countries and is usually appreciated from its physical appearance without prior knowledge of its chemical and biological properties. This study investigates the suitability of groundwater for domestic and irrigational purposes through physico-chemical and bacteriological analyses in the Northern part of Bamenda Town (Cameroon). Thus, 20 groundwater samples were collected from hand-dug wells and spring sources in September 2018 (rainy season) and February 2019 (dry season) and physico-chemical and bacteriological characteristics were determined. The results revealed that pH ranged from 5.5 to 6.6, thus enabling the classification of the water as slightly acidic. Electrical conductivity varied between 0.01 - 0.06 μS/cm. The relative abundance of ions was such that Ca2+ > K+ > Mg2+ > Na+ for cations and HCO-3 > Cl- > NO-3 > SO-4 for anions. The water types were Ca-Mg-NO3 in both dry and rainy seasons. The results revealed that the mechanisms controlling groundwater chemistry are rock weathering and atmospheric precipitation. Indicator bacteria such as E. coli, Shigella, Enterobacteria, Vibrio, Streptococcus and Staphylococcus were detected in the studied groundwater samples, thus the water sources may pose a threat to public health.

关键词： Reliable Drinking Water Groundwater Quality Spring Sources Chemical Characteristics Bacteriological Characteristics

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Windows彩色出版系统

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电子与电脑 1995年第4期2卷 93-107页

作者： gus Venditto Ron Lockhart 张宇佳

基础知识为了制作出像照片那么逼真的效果,必须掌握核心技术:输入、彩色匹配、编辑和输出。普通配置这种配置使真彩色的制作费用低廉,但其效果却使操作新手沮丧。高档配置设备的充分选择和配置会增强小型企业和协作出版的能力。专业级... 详细信息

基础知识为了制作出像照片那么逼真的效果,必须掌握核心技术:输入、彩色匹配、编辑和输出。普通配置这种配置使真彩色的制作费用低廉,但其效果却使操作新手沮丧。高档配置设备的充分选择和配置会增强小型企业和协作出版的能力。专业级配置具有专业质量的编辑工具和输入、输出设备终于装备到桌面系统中。

关键词： Windows 彩色出版系统应用程序

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中国—加拿大双边投资条约:独特性和非互惠性

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国际经济法学刊 2014年第2期 1-52页

作者： gus Van Harten 谷婀娜刘志一加拿大约克大学奥斯古德堂(Osgoode Hall)法学院厦门大学法学院

中加双边投资条约的独特性和非互惠性,不仅表现在法律上,还包括在事实上对中方有利。条约对市场准入、外资审查、准入后国民待遇、最惠国待遇、业绩要求和投资者与东道国间的争端解决机制等核心条款的规定均存在非互惠性,进而为加拿大... 详细信息

中加双边投资条约的独特性和非互惠性,不仅表现在法律上,还包括在事实上对中方有利。条约对市场准入、外资审查、准入后国民待遇、最惠国待遇、业绩要求和投资者与东道国间的争端解决机制等核心条款的规定均存在非互惠性,进而为加拿大政府埋下了法律与经济层面的隐患。考虑到加拿大在中加投资条约项下的资本输入国地位,以及该条约的独特性和不可逆转性,在批准之前,加拿大应对中加双边投资条约进行彻底的、独立的和公开的审查。

关键词：条约投资中加核心双边加拿大

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SURAMIN ACTIVITY IN HUMAN HEAD AND NECK SQUAMOUS CELL CARCINOMA

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山东大学学报(医学版) 1992年第3期 263-269页

作者：李安太王天铎栾信庸姜玉芳 gus A.M.S.van dongen Boudewijn J.M.Braakhuis Gordon B.Snow Amsterdam The Netherlands Dept.of Otolaryngology/Head and Neck Surgery Free University Hospital Amsterdam The Netherlands Dept.of Otolaryngology/Head and Neck Surgery Free University Hospital Amsterdam The Netherlands Dept.of Otolaryngology Affiliated Hospital of Shandong Medical University Dept.of Otolaryngology Affiliated Hospital of Shandong Medical University Dept.of Otolaryngology Affiliated Hospital of Shandong Medical University Dept.of Otolaryngology Affiliated Hospital of Shandong Medical University Dept.of Otolaryngology/Head and Neck Surgery Free University Hospital

Suramin,a drug used for the treatment of African trypanosomi-asis and onchoceriasis,has potential anti-cancer *** the present *** effect of suramin on proliferation of human head and neck squamous cellcarcinoma cells was determined.A significant growth inhibition in all threecell lines tested was observed when the concentration of suramin was 100μg/ml or *** hypothesis was tested whether growth inhibition may bedue to selective interference with the action of epidermal growth *** growth inhibiting concentrations only partly antagonized the growth slimulat-ing effect of EGF at concentrations as low as 0.1 ng/ml,indicating that alsoother mechanisms of action may contribute to the growth inhibitory activity ***,evidence was found that also serum proteins other thangrowth factors presented in the culture medium have a growth stimulating effecton cells and a strongly antagonistical effect on suramin activity.

关键词： Suramin Head and neck neoplasms Cell line

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深化改革夯实科研基础规范管理促进产业发展

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大麦与谷类科学 2006年第1期23卷 1-3页

作者：顾双平江苏沿海地区农业科学研究所江苏盐城224002

介绍了近年来江苏沿海地区农科所在深化科技体制、机制创新、农业科技成果创新和促进成果转化的基本做法和效果。一是深化改革,面向市场调整结构,加强科研工作的基础地位;二是发挥优势,形成特色,不断提高科研产出的质量;三是加强对科技... 详细信息

介绍了近年来江苏沿海地区农科所在深化科技体制、机制创新、农业科技成果创新和促进成果转化的基本做法和效果。一是深化改革,面向市场调整结构,加强科研工作的基础地位;二是发挥优势,形成特色,不断提高科研产出的质量;三是加强对科技产业的规范管理,提高科技产业的经济效益。

关键词：科研产业改革管理发展

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The Twin Bambili Maars (Bamenda Mountains, Cameroon Volcanic Line): Simulative Model of Formation

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Open Journal of Geology 2017年第4期7卷 443-456页

作者： Wotchoko Pierre Takojio Nguemo Rose Eugenie Kouankap Nono gus Djibril Guedjeo Christian Suh Nkouathio David Guimollaire Bobga Stanley Babila Chenyi Marie-Louise Vohnyui Tchokona Seuwi dieudonne Suh Emmanuel Cheo Department of Geology Higher Teacher Training College University of Bamenda Bambili Cameroon Institut de Recherche Géologique et Minière Laboratoire de Traitement des Minerais Yaoundé Cameroon Department of Earth Sciences Faculty of Sciences University of Dschang Dschang Cameroon Department of Earth Sciences Faculty of Sciences University of Yaoundé 1 Yaoundé Cameroon Economic Geology Unit Department of Geology and Environmental Science University of Buea Buea Cameroon

The Bambili maars are twin contemporaneous maars embedded in trachytic rocks. The two maars are separated by a low lying inter-Maar dome whose inner walls dip towards the Southern Maar. The Bambili Northern Maar (BNM) contains water and its floor is found at an altitude lower than the Bambili Southern Maar (BSM) (50 m) which is swampy and drains into the BNM. Both maars have very steep vertical walls. Three different units are identified in the area. Unit 1 is 1 m thick sequence, characterize by the presence of matrix supported fine-grained fallouts (ash and lapilli size) with stratified diffused bedding planes. This unit is further subdivided into three different layers: L1, L2 and L3 from bottom to top with increasing sizes of particles respectively. This layer shows reverser grading and its grain sizes rarely exceed 2 cm and this unit shows no depositional structures. Unit 2 is an unstratified unit predominantly made up of tephra deposits. Within these deposits are found blocks of sizes ranging between 2 and 10 cm of different petrographic types. They include scoria, basalts, trachyte, and granite cognate. The last unit, Unit 3 is distinctly stratified characterized by well sorted, heterolithologic, graded bedding layers which are matrix supported. Base on the composition and grain sizes, this unit was subdivided into 7 horizons: h1 - h7. Within this unit, two sequences of deposits are distinguished: U1 and U2. Both sequences are characterized by alternation of lapilli and tuff beds. The clast comprises of juvenile materials, mudstone which are highly vesicular and altered rock fragments. Other products identified within the area are ferolithic volcanic bombs (5 - 20 cm), xenocrystals (2 - 4 cm) within finer deposits. They are elongated and show visible twinned planes. Explosion breccias are equally identified occurring as bolders. Along the inner walls of the maars are also found large basaltic and trachytic blocks which are remnants of pre-maar unit within maar

关键词： Maar Bambili Dynamisms Model

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完美风暴

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汽车与运动 2015年第1期 84-85页

作者： HENRY CATCHPOLE NICK TROTT BEN MI L LER RICHARD MEADEN ASTON PARROTT gus GREGORY

2014十佳年度性能车的面对面较量即将展开,为了这场难得一遇的碰撞,我们等来了一个典型的英国式"风暴"天气。但无论如何,令人垂涎的evo年度性能车头衔只有一个,不如我们赌上—把?

关键词：令人垂涎英国式 “风暴”

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土生空团菌的遗传多样性分析

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菌物学报 2014年第3期33卷 738-745页

作者：陈立红乌仁陶格斯王亭邓云成阎伟内蒙古农业大学农学院内蒙古呼和浩特010019 呼和浩特民族学院环境工程系内蒙古呼和浩特010051

为了研究土生空团菌的遗传多样性,对来自中国、美国、瑞士和法国等菌株的rDNA ITS区进行序列分析,利用Popgene32和phylip软件进行数据计算和聚类分析。序列分析表明土生空团菌rDNA ITS区的序列长度为422–447bp,遗传距离在0.000–0.051... 详细信息

为了研究土生空团菌的遗传多样性,对来自中国、美国、瑞士和法国等菌株的rDNA ITS区进行序列分析,利用Popgene32和phylip软件进行数据计算和聚类分析。序列分析表明土生空团菌rDNA ITS区的序列长度为422–447bp,遗传距离在0.000–0.051之间。居群结构和聚类分析结果表明:(1)土生空团菌有一定的遗传多样性,且遗传差异主要来自于居群内;(2)基因流Nm>1,遗传漂变不是导致土生空团菌居群遗传分化的主要因素;(3)土生空团菌的遗传分化受到地理环境的影响,而与宿主来源没有明显相关性。

关键词：土生空团菌 rDNA转录间隔区遗传多样性遗传分化

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美国交通部资助的一项高速机车开发项目引起不同反响

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国外铁道机车与动车 1996年第4期 48-48页

作者： gus Welty 姜冬

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Time-dependent measurement of high-power laser light reflection by low-Z foam plasma

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High Power Laser Science and Engineering 2021年第3期9卷 40-53页

作者： M.Cipriani S.Yu.gus’kov F.Consoli R.De Angelis A.A.Rupasov P.Andreoli G.Cristofari G.Di Giorgio M.Salvadori ENEA Fusion and Technologies for Nuclear Safety DepartmentC.R.FrascatiFrascati(Rome)Italy Lebedev Physical Institute MoscowRussia Universita di Roma La Sapienza RomaItaly INRS-EMT VarennesQuebecCanada

Porous materials have many applications for laser–matter interaction experiments related to inertial confinement *** new knowledge about the properties of the laser-produced plasma of porous media is a challenging *** this work,we report,for the first time to the best of our knowledge,the time-dependent measurement of the reflected light of a terawatt laser pulse from the laser-produced plasma of low-Z foam material of overcritical *** experiments have been performed with the ABC laser,with targets constituted by foam of overcritical density and by solid media of the same chemical *** implemented in the MULTI-FM code a model for the light reflection to reproduce and interpret the experimental *** the simulations together with the experimental results,we indicate a criterion for estimating the homogenization time of the laser-produced plasma,whose measurement is challenging with direct diagnostic techniques and still not achieved.

关键词： porous materials foams high-power lasers numerical simulations inertial confinement fusion

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