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Relationship Between Heavy Metal Concentrations in Bottom Sediments and the Clam, Galatea Paradoxa (Born 1778) from the volta Estuary, Ghana

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Journal of Environmental Protection 2011年第6期2卷 720-728页

作者： Hashem A Madkour Kwasi A Obirikorang Steve Amisah Fred A Otchere Daniel Adjei-Boateng National Institute of Oceanography and Fisheries (NIOF) Red Sea Branch Department of Fisheries and Watershed Management Faculty of Renewable Natural Resources Kwame Nkrumah University of Science and Technology (KNUST)

This research was carried out at two locations, Ada and Aveglo at the volta Estuary, Ghana to evaluate the importance of sediments as regulatory media in controlling the levels of four metals, Manganese (Mn), Zinc (Zn), Iron (Fe) and Mercury (Hg) in the tissues of the clam, Galatea paradoxa (Born 1778) and to investigate the possible relationships between the concentrations of the metals in the sediments and the clams. The clams were categorized into three size classes as follows: small (25 - 40 mm), medium (41 - 55 mm), and large (above 55 mm). To understand the possible relationships between the concentrations of the studied metals in the sediments and in the tissues of the three clam size classes, the monthly concentrations of the studied metals were graphed and subjected to Pearson correlation analyses (p < 0.05) to identify metal accumulation patterns and determine whether or not positive relationship patterns existed between the concentrations in the clams and sediment samples. The correlation revealed no simple linear relationships between the concentrations of four heavy metals in the clam tissues and the sediments at the two sampling stations although some distinct trends were observed. Mn concentrations in the clams and sediments from the two stations showed some clear positive relationship patterns with some increments in monthly sediment concentrations resulting in increments in clam tissue concentrations. This relationship though, was not too clear-cut.

关键词： Heavy Metal Galatea paradoxa Sediments volta Estuary

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Generalized Additive Mixed Modelling of River Discharge in the Black volta River

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Open Journal of Statistics 2017年第4期7卷 621-632页

作者： Wahab A. Iddrisu Kaku S. Nokoe Albert Luguterah Eric O. Antwi Department of Mathematics and Statistics University of Energy and Natural Resources Sunyani Ghana Department of Statistics University for Development Studies Navrongo Ghana Department of Energy and Environmental Engineering University of Energy and Natural Resources Sunyani Ghana

River discharge data offer a rich source of information for reservoir management and flood control, if modelling can separate out the effects of rainfall, land use, soil type, relief, and weather conditions. In this paper, we model river discharge data from the Black volta River, using Generalised Additive Mixed Models (GAMMs) with a space-time interaction represented via a tensor product of continuous time and discrete space. River discharge data from January 2000 to December 2009 for the four gauge stations along the Black volta River namely, Lawra, Chache, Bui and Bamboi were obtained from the hydrological services department of Ghana and used for model fitting. Four GAMMs were explored, two with space-time interactions and two without space-time interactions. The comparison of the performance of the models with space-time interactions and those without space-time interactions based on Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC) suggests that in this application, the former is better overall and in particular for modelling local variations. Further, a model with space and time main effects performed better compared with one without space and time main effects. After model selection, checking and validation, there is evidence for increasing river discharge from the most upstream gauge station to the most downstream gauge station for the study period.

关键词： River Discharge GAMM Tensor Product Smooth Space-Time Interaction Black volta River

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Analysis of Extreme Rainfall Events (Drought and Flood) over Tordzie Watershed in the volta Region of Ghana

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Journal of Geoscience and Environment Protection 2017年第9期5卷 275-295页

作者： Mexoese Nyatuame Sampson Agodzo Department of Agricultural and Biosystems Engineering Kwame Nkrumah University of Science and Technology Kumasi Ghana Department of Agricultural Engineering Ho Technical University Ho Ghana

In regional water resources management and disaster preparedness, the analysis of extreme rainfall events is essential. The need to investigate drought and flood conditions is now heightened within the context of climate change and variability. The Standardised Precipitation Index (SPI) was employed to assess the extreme rainfall event on Tordzie watershed using precipitation data from 1984-2014. The SPI on the time scale of 3, 6, 9 and 12 months were determined using “DrinC” software. The drought was characterised into magnitude, duration, intensity, frequency, commencement and termination at the time scales of SPI-3, SPI-6, SPI-9 and SPI-12. Results indicated that the middle reaches (Kpetoe) of the watershed experienced less severe drought condition compared to the lower reaches (Tordzinu). Mann-Kendall (MK) test and Sen’s slope (SS) revealed general increasing drought trend but insignificant at 95% confidence interval. The SS indicated change in magnitude of 0.016 mm/year, 0.012 mm/year, 0.026 mm/year and 0.016 mm/year respectively at the mentioned time scales at 95% confidence interval at the Tordzinu and that of Kpetoe were 0.006 mm/year, 0.009 mm/year, 0.014 mm/year and 0.003 mm/year. These changes could have implication for agriculture and water resources management and engender food insecurity among smallholder farmers.

关键词： Extreme Rainfall Characteristics Standardised Precipitation Index (SPI) Trend Analysis Tordzie Watershed volta Region Ghana

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红色风暴——丰田volta

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汽车知识 2004年第4期 27-27页

作者：王鹏

意大利人用非凡的创意,领跑着当今世界汽车造型潮流。本届日内瓦车展上,意大利设计展示了其为丰田设计的双门双座概念跑车volta,以此证明即便使用的是"绿色"燃料,依然能跨入高性能跑车行列。

关键词：汽车造型意大利设计日内瓦车展 volta 红色风暴

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以深度学习为目标,NVIDIA发布首款volta架构GPU

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华东科技 2017年第5期 14-14页

作者：寒意

NVIDIA首款基于volta架构GPU技术的产品终于正式登场。在这次的GTC大会上,该公司推出了无论在性能亦或是价位上都相当强大的资料中心用显卡:NVIDIATesla V100。做为P100的升级款式,其使用上了NVIDIA第七代的最新架构、采用12nm制程,搭载... 详细信息

NVIDIA首款基于volta架构GPU技术的产品终于正式登场。在这次的GTC大会上,该公司推出了无论在性能亦或是价位上都相当强大的资料中心用显卡:NVIDIATesla V100。做为P100的升级款式,其使用上了NVIDIA第七代的最新架构、采用12nm制程,搭载5120 CUDA核心、16GB HBM2内存与NVLink 2.0的连接界面,带来为更精密的AI与深度学习技术当后盾的15teraflops运算能力。在最新运算核心发布的同时,NVIDIA也宣布了直接搭载8组Tesla V100、要价美金14.9万

关键词： NVIDIA volta GPU 深度学习

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Tartaric Acid Modified Electrodes and Studies on its Application for the Anodic striphing voltammetry of cu(Ⅱ)

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高等学校化学学报(英文版) 1987年第2期 19-25页

作者： Fang Yuzhi,Li Yuansheng Jin Litong(Department of Chemistry,East China Normal University,Shanghai)

The preparation of tartaric acid modified electrode was *** mechanism of copper(Ⅱ) on tartaric acid modified electrode was discussed and determination conditions for trace Cu(Ⅱ) by ASV were also founded.

关键词： founded Modified glassy 金利通 listed volta advantageous rotating virtue determ

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THE PRINCIPLE OF DESIGN FOR DOUBLE INJECTION Ge MAGNETO-DIODE

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电子科学学刊(英文版) 1986年第4期3卷 292-296页

作者：黄得星 Department of Physics Heilongjiang University

design principle is propose for long.P+IN+Ge magneto-diode with a high surface recombinationregion on one *** optimal relation is established for design among its length l,depth d,width wand resistivity p:where ⊿T is the maximum permissible temperature rise of the chip,Rththe thermal resistance of theheader,Io the forward current of the diode.

关键词： magneto length resistivity volta lifetime 加名电子材料 ceramic 山田 mirror

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HF and Microwave Electronnic Measurement

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计量学报 1991年第S1期12卷 71-77页

05001 On the Reflection Coefficient Expressed inTerms of the Conjugate Impedances. Huang Zhixun:1(1). 1980. *** paper discusses the power waves and theirapplications. These waves are related to the availablepower of the generator. The reflection coefficient ofthe power waves is different from the conventionaltravelling waves. and it can lead to more precisethinking and measurements. Using this theory. we ex-

关键词： Conjugate generator waveguide mount modulator determ volta transmitting waveform attenuation

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SEGNALAZIONI FLORISTICHE PER IL TERRITORIO BRESCIANO: 58-79

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Natural Disaster Reduction in China 1992年第1期 135-144页

作者： ARTURO CRESCINI SERGIO DANIELI CINZIO DE CARLI FILIPPO TAGLIAFERRI Centro Studi Naturalistici Bresciani

Some stations for the following spectes are pointed out:Anagallis *** squamatus, Cistus salvifolitts,Cypripedium *** *** glaucum,***-arerae,Humulus scan- *** pyramidale,Phacelia tanacetifolia,Plantago *** australe,Pot... 详细信息

关键词： Polygonaceae Rumex Leguminosae Labiatae Umbelliferae Potamogeton Carex terre volta hybrida

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JOURNAL OF ELECTRONICS(1992)(CHINA)

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Journal of Electronics(China) 1992年第4期9卷 384-385页

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