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Factors Influencing the Shallow Groundwater Quality in Four Districts with Different Characteristics in Urban Area (Douala, Cameroon)

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Journal of Geoscience and Environment Protection 2017年第8期5卷 99-120页

作者： Beatrice Ketchemen-Tandia Suzanne Ngo Boum-Nkot Seth Rodrigue Ebondji bertil Yvon Nlend Huguete Emvoutou Olivia Nzegue Department of Geosciences University of Douala Douala Cameroon

This study examines groundwater samples from four areas under different conditions. Variations amongst the areas are due to the distinct topography, demographics, and socio-economic activities. A qualification of the groundwater using the following parameters;pH, electric conductivity and nitrate analysis yielded results depicting the deplorable state of the unconfined aquifer;which is even worst in the densely populated and low-lying areas. These unfavorable conditions are present in the older districts (Bependa and Ndogbong) compared to the younger and least populated (urbanized) districts (Ndogpassi and Logpom). The poor quality of groundwater could be due to contamination by sewage from latrines and surface discharges. Nevertheless, nitrate contents (>241 mg/l) in these districts indicate that pollution has not reached the alarming levels observed in other West African cities (nitrates > 400 mg/l). Relatively low concentrations of nitrate in groundwater of the studied areas could be due to volatilization phenomena common in the unconfined aquifers in Douala. We however remarked that most of the studied wells are not used as drinking water, because they present particular health risks to humans.

关键词： Shallow Groundwater Quality Districts Urban Chemistry

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Clinical Ophthalmic Oncology 1

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2007年

作者： Arun D Singh bertil E. Damato Jacob Pe'er A. Linn Murphree Julian Perry

ISBN: (纸本)9781416031673

Written by internationally renowned authorities, this book provides expert guidance and advice on the diagnosis and management of the complete range of ocular cancers—including eyelid, conjunctival, intraocular, and orbital tumors. From basic principles through the diagnosis and management of every cancer type, it equips you with the state-of-the-art knowledge you need to identify these cancers early and treat them as effectively as possible. More than 800 full-color photographs and illustrations facilitate diagnosis, and a consistent, user-friendly format expedites reference. Plus, a bonus CD-ROM enables you to incorporate any of the book's figures into your PowerPoint® presentations!

关键词： Eyelid Neoplasms.

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并行程序设计

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作者： (德)贝蒂尔·施密特(bertil Schmidt)[等]

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钢丝纤维喷射混凝土

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矿业工程 1979年第3期 41-43页

作者： bertil Sandell 顾延亢瑞典BESAB公司

在斯堪的纳维亚,喷射混凝土支护法从五十年代中期就开始被用在隧道支护和填隙工程中,并在精致的岩石工程中用于支护顶板和岩壁。本文就瑞典北部克里斯蒂尼贝格(Kristineberg)地区波立登矿山工程对钢丝纤维加强的喷射混凝土的发展和应用... 详细信息

在斯堪的纳维亚,喷射混凝土支护法从五十年代中期就开始被用在隧道支护和填隙工程中,并在精致的岩石工程中用于支护顶板和岩壁。本文就瑞典北部克里斯蒂尼贝格(Kristineberg)地区波立登矿山工程对钢丝纤维加强的喷射混凝土的发展和应用情况做了介绍。

关键词：喷射混凝土纤维钢丝

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High pressure induced novel phase transition in nano-confined C60Crystals

High pressure induced novel phase transition in nano-confine...

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第十七届全国光散射学术会议

作者：刘冰冰姚明光王霖刘德弟崔雯 bertil Sundqvist 吉林大学超硬材料国家重点实验室 Department of Physics Umea University

The phase transformation of carbon materials under high pressure have attracted growing research interest due to the appearance of nanometer scale size effect and the novel high pressure behavior which is hardly discovered in their corresponding bulk *** type of materials with excellent physical and chemical properties can be consequently found which is rarely obtained at ambient condition.A typical example is the high pressure induced transformation from soft graphite to superhard diamond.C

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Hydrogeochemical Characteristics and Quality Assessment of Surface Water in an Agricultural Area in Equatorial Africa: The Mungo River Basin, South West Cameroon, Central Africa

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Journal of Geoscience and Environment Protection 2021年第3期9卷 164-181页

作者： Gustave Raoul Nkoue Ndondo Suzanne Ngo Boum Fricelle Song Gloria Eneke Takem Eyong David Eric Komba bertil Nlend Jacques Etame Department of Earth Sciences University of Douala Douala Cameroon Institute for Geological and Mining Research Yaoundé Cameroon

The Mungo River and its tributaries represent the major sources of water supply for agriculture and drinking purposes for the Douala city and the south western agricultural region of Cameroon. In this study, the surface water hydrochemistry was investigated at 12 locations to determine the hydrochemical and heavy metals characteristics and to assess the suitability for drinking and irrigational purposes. Results of water samples collected along the main channel and tributaries showed that the major ions were dominated by Ca2+ > Na+ > Mg2+ > K+ > NH4+ and > HCO3- > SO42- > Cl- > F- > PO43- , with concentrations varying between 0 to 60 mg/l. Heavy metal concentrations were relatively weak, dominated by Fe > Mn > As > Cd > Zn > Se. The main hydrochemical facies types revealed primarily 52% Ca-Na-HCO3 and 48% Ca-Mg-HCO3. Base on Gibbs diagram and relative ion ratios, the hydrochemical characteristics are derived from weathering of silicate rocks and atmospheric source. The influence of anthropogenic factors including agro-industrial activities on the hydrochemical characteristics was less marked. The chemical composition of the water samples was compared with the drinking water standards and only the concentration of Fe was above the WHO guide limits in a single sample at Passi. The evaluation of the water quality for irrigation showed that 95% of water samples are suitable for irrigation in almost all soil types. According to the water quality index (HPI, HEI and Cd), this water is considered of excellent quality for consumption. The results provide a preliminary da

关键词： Mungo River Basin Surface Water Hydrochemical Characteristics Heavy Metals Drinking and Irrigation Suitability

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拟眼部组织胞浆菌病

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国际眼科纵览 1982年第6期 341-342页

作者： bertil E Damato 刘轶凡

拟眼部组织胞浆菌病综合征(Presumed ocular histoplasmosis)系指前房和玻璃体通常无炎症而眼底出现黄斑盘状病变、周边部萎缩性瘢痕和视乳头周围病变等为特征的眼疾患。 Woods和Wahlen(1960)首先报道此病,其患者均有荚膜组织胞浆菌接... 详细信息

拟眼部组织胞浆菌病综合征(Presumed ocular histoplasmosis)系指前房和玻璃体通常无炎症而眼底出现黄斑盘状病变、周边部萎缩性瘢痕和视乳头周围病变等为特征的眼疾患。 Woods和Wahlen(1960)首先报道此病,其患者均有荚膜组织胞浆菌接触史。北美和近年欧洲文献发表过相当多的有关文章。Craandijk(1979)对这些文章曾进

关键词：组织胞浆菌病综合征胞浆病人综合病症细胞质眼部黄斑病变视网膜疾病眼部组织眼底周边部脉络膜葡萄膜黄斑盘状变性

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钢包冶金——不同搅拌方法的影响

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大型铸锻件 1989年第3期 68-75页

作者： bertil Berg Goran Carlsson MatsCrmming 赵士英

为了研究钢包冶金中不同搅拌方法对物理和化学反应的影响,已经进行了4～9 t 钢水的工厂中间试验。对在大气下和真空下进行的通过透气砖吹气净化和电磁搅拌,已作了研究。脱硫等渣钢反应需要渣铜界面混合得好,所以必须采用气体净化来实现... 详细信息

为了研究钢包冶金中不同搅拌方法对物理和化学反应的影响,已经进行了4～9 t 钢水的工厂中间试验。对在大气下和真空下进行的通过透气砖吹气净化和电磁搅拌,已作了研究。脱硫等渣钢反应需要渣铜界面混合得好,所以必须采用气体净化来实现。去除非金属夹杂等则应采用电磁搅拌。对于脱氧钢的真空处理,只要在电磁搅拌时加入少量惰性气体,就可以使反应速度大增。

关键词：钢包冶金搅拌方法电磁搅拌化学反应气体净化真空处理非金属夹杂中间试验

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Knowledge about Acute Myocardial Infarction (AMI) and attitudes to medical care seeking—A comparison between patients and the general public

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Open Journal of Nursing 2012年第4期2卷 372-378页

作者： Catrin Henriksson Margareta Larsson Judy Arnetz Johan Herlitz Jan-Erik Karlsson Leif Svensson Marie Thuresson Crister Zedigh Lisa Wernroth bertil Lindahl Department of Cardiology Falu Hospital Falun Sweden Department of Cardiology Orebro University Hospital Orebro Sweden Department of Cardiology Ryhov Hospital Jonkoping Sweden Department of Clinical Science and Education Karolinska Institute Stockholm Sweden Department of Family Medicine and Public Health Sciences Wayne State University Detroit USA Department of Medical Sciences and Uppsala Clinical Research Center Uppsala University Uppsala Sweden Department of Women’s and Children’s health Uppsala University Uppsala Sweden Institution of Medicine Sahlgrenska University Hospital Gothenburg Sweden

Background: Patients with acute myocardial infarction often have long decision times before seeking medical care. The decision time is influenced by knowledge of AMI-symptoms, psychological factors and the response of people near the patient to the symptoms. Aim: To investigate and compare the knowledge of AMI, intended actions in response to AMI-symptoms and attitudes toward seeking medical care of patients and the general public. Method: This was a multicentre study with descriptive and comparative design, using questionnaires as an instrument. The population consisted of AMI-patients and representatives of the general public. Results: There was good knowledge about typical AMI-symptoms among the participants. The majority thought an AMI always starts suddenly. Patients did not know more about the time-dependency of treatment outcome than the general public. A greater proportion of the general public would contact an additional person before consulting medical professionals. Conclusions: Patients had no better knowledge about AMI than the general public, but would more commonly act appropriately in case of AMI-symptoms.

关键词： Acute Myocardial Infarction Decision Making Patient General Public Knowledge and Attitudes

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宜家故事

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作者： (瑞典)伯迪·托尔卡(bertil Torekull)

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