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Harnessing Microalgae Biomass from Lake Taihu as a Natural Biocolorant Source for Sustainable Eco-Friendly Dyeing of Cotton with Ultrasonication

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Journal of Textile Science and Technology 2022年第2期8卷 107-121页

作者： Jakpa Wizi Lixiao Ni Cunhao Du Benjamin Kwablah Asinyo ebenezer kofi howard Charles Frimpong Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes MOE School of Environment Hohai University Nanjing China Department of Textiles Kwame Nkrumah university of Science and Technology Kumasi Ghana

Most water bodies worldwide are infested with algae bloom and Lake Taihu is no exception, various techniques have been developed to harvest microalgae from Lake Taihu as part of the lake cleaning program and this results in a large algae biomass to deal with. This study made use of the algae biomass harvested as a biocolorants source for textile application and also evaluated its dyeing characteristics with mercerized and bleached cotton. The fabrics were dyed with either ultrasound or water bath method. The ultrasound method improved dye extraction yield from 17.8% for the conventional method to 26.7%, which was also enhanced to 33.2% with the addition of HCl (1 cm). The ultrasound dyeing method was effective at improving dye uptake at a reduced dyeing temperature when compared to the conventional method and also produced different shades of color after dyeing with different mordants. The dyed fabrics had good fastness properties for laundry, crocking and light. The dyed fabrics also showed a good ultraviolet protection factor. The use of algae biomass as a potential source of colorants for textile application will provide an alternate dye source that is environmentally friendly.

关键词： Algae Biomass Ultrasound-assisted Dyeing Cotton Fabric Solvent Color Fastness

Investigation of Acoustomagnetoelectric Effect in Bandgap Graphene by the Boltzmann Transport Equation

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World Journal of Condensed Matter Physics 2024年第1期14卷 10-20页

作者： Raymond Edziah Samuel S. Bentsiefi Kwadwo Dompreh Anthony Twum Emmanuel kofi Amewode Patrick Mensah-Amoah ebenezer T. Tatchie Cynthia Jebuni-Adanu Samuel Y. Mensah Department of Physics University of Cape Coast Cape Coast Ghana Department of Physics Education University of Education Winneba Ghana

We study the acoustomagnetoelectric (AME) effect in two-dimensional graphene with an energy bandgap using the semiclassical Boltzmann transport equation within the hypersound regime, (where represents the acoustic wavenumber and is the mean free path of the electron). The Boltzmann transport equation and other relevant equations were solved analytically to obtain an expression for the AME current density, consisting of longitudinal and Hall components. Our numerical results indicate that both components of the AME current densities display oscillatory behaviour. Furthermore, geometric resonances and Weiss oscillations were each defined using the relationship between the current density and Surface Acoustic Wave (SAW) frequency and the inverse of the applied magnetic field, respectively. Our results show that the AME current density of bandgap graphene, which can be controlled to suit a particular electronic device application, is smaller than that of (gapless) graphene and is therefore, more suited for nanophotonic device applications.

关键词： Boltzmann Transport Equation Acoustomagnetoelctric Effect Surface Acoustic Wave Gapless Graphene Weiss Oscillations

Quantitative Easing: Money Supply and Commodity Prices of Oil, Gold, and Cocoa in Ghana

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Open Journal of Statistics 2023年第5期13卷 663-693页

作者： Samuel Kwaku Obeng Samuel Bassah kofi Quansah Theresa Dowetin Ampem Darko Nsiah Ezekiel Nii Noye Nortey ebenezer Okyere Research and Statistics Unit Minerals Commission of Ghana Accra Ghana SPARKX Ghana Ltd. Accra Ghana Datus International School Tema Ghana Statistics Unit CID Headquarters Accra Ghana Department of Statistics and Actuarial Science University of Ghana Accra Ghana Research and Policy Unit Bank of Ghana Accra Ghana

This study investigates the dynamic relationships between the money supply (M2) and key commodity prices (Cocoa, Gold, and Crude) in the context of Ghana. Utilizing Vector Error Correction Model (VECM) analysis, we analyze the short-term and long-term Granger causality relationships among these variables, aiming to shed light on the potential linkages between monetary policy and commodity markets. The analysis covers the period from December 1999 to April 2023, using lag structures of 1 and 8 to capture both short-term and more enduring effects. Our findings reveal significant Granger causality relationships between the money supply and various commodities, with nuanced patterns emerging across different lags. In the short-run, our results suggest bidirectional causal relationships between COCOA and M2, CRUDE and M2, and GOLD and M2. Additionally, M2 Granger causes changes in COCOA, CRUDE, and GOLD. However, the causal relationship between COCOA and GOLD appears to be unidirectional, with COCOA not significantly Granger causing changes in GOLD. The short-term findings highlight the intricate interplay between monetary policy and commodity markets. In the long-run (lag 8), our analysis unveils robust Granger causality relationships between the variables. Past values of COCOA, CRUDE, and GOLD Granger cause changes in M2, indicating a notable influence of commodity markets on the money supply. Similarly, M2 Granger causes changes in CRUDE and GOLD. Notably, the findings underscore a more comprehensive and intertwined relationship between monetary policy and commodity prices in the long-run. Based on these results, we derive several policy implications. Policymakers should carefully consider the potential impact of monetary policy decisions, such as quantitative easing, on commodity markets and price dynamics. Measures to stabilize commodity prices, promote export diversification, manage inflation expectations, and enhance economic resilience are recommended. Additional

关键词： Quantitative Easing Money Supply Cocoa Gold Crude VECM

Assessment of the Impact of Solid Waste Dumpsites on Some Surface Water Systems in the Accra Metropolitan Area, Ghana

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Journal of Water Resource and Protection 2012年第8期4卷 605-615页

作者： Vincent Kodzo Nartey ebenezer kofi Hayford Smile Kwami Ametsi University of Ghana

Water samples from four water bodies that flow through some solid waste dump sites in the Accra metropolitan area of Ghana were analysed over a period of six months for Cd, Pb, Cu, Zn and Mn contents;coliform bacteria and helminth eggs. Other water quality parameters such as BOD, DO, suspended solids and turbidity were also assessed. Cd, Pb, Zn, Mn, and Cu were determined using flame atomic absorption spectrometry (FAAS). Faecal coliforms, total coliforms and helminth eggs were determined by the membrane filtration (MF) method. The water samples contain various levels of Cd, Pb and Mn;Zn and Cu levels were low and found to be below the detection levels of the instrument in most cases. Helminth egg counts in water samples were high;an indication that the water bodies were polluted with pathogens. It has been observed that the major sources of pollutants into the water bodies were organic waste as well as coliform bacteria derived from these waste dumps. The elevated levels of bacteria make the water bodies unsafe for both primary and secondary contacts.

关键词： Landfills Solid Waste Dumpsite Water Bodies

借助抽雄期长茎段育苗释放多年生饲草玉米茎节扩繁潜力

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草业学报 2020年第6期29卷 204-213页

作者：严旭吴子周李影正李晓锋何如钰杨春燕李杨周阳石建忠 ebenezer kofi Sam 何建美荣廷昭唐祈林四川农业大学玉米研究所四川温江611130 四川省农业科学院牧业研究中心四川南充637000 四川省农业科学院蚕业研究所四川南充637000 贵州省草业研究所贵州贵阳550006

多年生饲草玉米‘玉草6号’为分蘖多、生物量高、适口性好的C4丛生型高大禾草,仅能通过营养体无性繁殖。越冬返青幼苗(分株苗)和上年茎节成苗(茎节苗)是其潜在繁殖体,但其茎节苗的田间表现和茎节田间育苗潜能未知。田间建植分株苗和茎节... 详细信息

多年生饲草玉米‘玉草6号’为分蘖多、生物量高、适口性好的C4丛生型高大禾草,仅能通过营养体无性繁殖。越冬返青幼苗(分株苗)和上年茎节成苗(茎节苗)是其潜在繁殖体,但其茎节苗的田间表现和茎节田间育苗潜能未知。田间建植分株苗和茎节苗,调查繁殖体类型对植株形态和生物量的影响;田间播种茎节,调查茎节播期、位置和茎段大小对茎节育苗的影响。茎节苗建植成功率(97.5%)高于分株苗(87.5%),两种繁殖体类型均可安全越冬(越冬率100%)。建植当年,分蘖期茎节苗植株茎径显著高于分株苗;此外,茎节苗植株的株高、草长、茎径、基部周长和分蘖均有微弱优势,但繁殖体类型间无显著差异;生物量在繁殖体类型间也无显著差异。次年,植株形态、生物量在繁殖体类型间也无显著差异。茎叶比年际间无显著差异,茎径次年显著降低,其他形态和产量性状均显著高于建植第1年。茎节播期和位置对茎节成活率、扩繁系数和种苗大小有极显著影响,而茎段大小对上述育苗参数无显著影响。在各组合中,抽雄期中、下部长茎段育苗表现最佳。茎节繁殖能拓宽多年生饲草玉米的繁殖体类型,并能提高建植成功率且不影响饲草生产性能。采用抽雄期中、下部长茎段育苗是释放多年生饲草玉米茎节扩繁潜力的有效措施。

关键词：多年生饲草玉米田间表现茎节扩繁分株扩繁扩繁系数

饲草玉米不同生育期的产量、品质和青贮利用研究

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草业学报 2019年第7期28卷 82-91页

作者：李影正严旭吴子周杨春燕李晓锋何如钰张萍 ebenezer kofi Sam 周阳张磊荣廷昭何建美唐祈林四川农业大学玉米研究所四川温江611130 四川省农业科学院牧业研究中心四川南充637000 贵州省草业研究所贵州贵阳550006

对墨西哥大刍草、玉草3号和玉草6号3种不同类型饲草玉米在孕穗期、抽雄期和吐丝期的产量、青贮品质及其营养价值进行了分析。结果表明:品种和生育期对鲜、干草产量有显著影响,而二者之间的交互作用对鲜、干草产量影响不显著;3个品种鲜... 详细信息

对墨西哥大刍草、玉草3号和玉草6号3种不同类型饲草玉米在孕穗期、抽雄期和吐丝期的产量、青贮品质及其营养价值进行了分析。结果表明:品种和生育期对鲜、干草产量有显著影响,而二者之间的交互作用对鲜、干草产量影响不显著;3个品种鲜、干草产量均在吐丝期最高,其中,玉草6号鲜、干草产量极显著高于玉草3号和墨西哥大刍草。从抽雄期及以后,所有饲草玉米干物质(DM)含量均达20%以上,符合青贮对水分的要求。粗蛋白(CP)含量从孕穗期到吐丝期逐渐降低,变幅为8.19%DM^12.80%DM;各时期CP含量均以玉草6号最高,玉草3号和墨西哥大刍草CP含量差异较小。可溶性糖(WSC)含量在孕穗期最高,纤维含量随生育期延长均呈上升趋势。青贮发酵品质在不同生育期差异显著,孕穗期pH值为3.69,乳酸(LA)含量为7.00%DM,发酵品质最优。品种主效应分析表明,玉草6号发酵品质最好,玉草3号和墨西哥大刍草差异不显著。综合分析品种和生育期对青贮发酵品质和营养成分的影响,玉草6号在孕穗期青贮,相对饲用价值达103.28,发酵品质和营养价值最好;玉草3号和墨西哥大刍草在抽雄期青贮发酵品质和营养价值最佳。

关键词：饲草玉米生育期青贮品质营养价值