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Nano Research 2022年第2期15卷 1564-1569页

作者： emmanuel batsa tetteh Tobias Loffler Tsvetan Tarnev Thomas Quast Patrick Wilde Harshitha Barike Aiyappa Simon Schumacher Corina Andronescu Richard D.Tilley Xingxing Chen Wolfgang Schuhmann Analytical Chemistry-Center for Electrochemical Sciences Faculty of Chemistry and BiochemistryRuhr University BochumUniversitatsstr.150D-44780 BochumGermany Chemical Technology III Faculty of Chemistry and CENIDE-Center for NanointegrationUniversity Duisburg EssenCarl Benz Str.199D-47057 DuisburgGermany School of Chemistry and Australian Centre for NanoMedicine University of New South WalesSydney 2052Australia Research Group of Functional Materials for El

Scanning electrochemical cell microscopy(SECCM)is increasingly applied to determine the intrinsic catalytic activity of single electrocatalyst *** is especially feasible if the catalyst nanoparticles are large enough that they can be found and counted in post-SECCM scanning electron microscopy ***,this becomes impossible for very small nanoparticles and hence,a catalytic current measured in one landing zone of the SECCM droplet cannot be correlated to the exact number of catalyst *** show,that by introducing a ruler method employing a carbon nanoelectrode decorated with a countable number of the same catalyst particles from which the catalytic activity can be determined,the activity determined using SECCM from many spots can be converted in the intrinsic catalytic activity of a certain number of catalyst nanoparticles.

关键词： intrinsic electrocatalytic activity nanoelectrochemistry scanning electrochemical cell microscopy(SECCM) PtNi nanoparticles single entity electrochemistry alkaline medium

The relationship between oxidative degradation and ammonia emission of carbon capture amines based on their chemical structures

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Clean Energy 2024年第1期8卷 134-152页

作者： Pailin Muchan Teeradet Supap Jessica Narku-tetteh Supranee Lisawadi Clean Energy Technologies Research Institute(CETRI) Faculty of Engineering and Applied ScienceUniversity of ReginaReginaSaskatchewanS4S 0A2Canada Department of Mathematics and Statistics Faculty of Science and TechnologyThammasat UniversityPathum Thani12120Thailand

This work investigates the effect of chemical structural positioning of different functional groups in 29 amines covering primary,secondary and tertiary alkanolamines as well as multi-alkylamines and cyclic amines on both amine degradation and ammonia(NH_(3))emissions during post-combustion amine-based carbon dioxide *** results helped to elucidate possible relation-ships between degradation and emissions as related to the chemical structure of the *** results showed that longer alkyl chain lengths in multi-alkylamines caused a more drastic decrease in both degradation and NH_(3) emissions followed by secondary *** decrease in those activities for primary and tertiary alkanolamines as well as cyclic amines was low and more so for NH_(3) *** contrast,the increase in hydroxyl groups in secondary alkanolamines caused a drastic increase in degrad-ation and NH_(3) *** the other hand,having more hydroxyl groups in sterically hindered primary and tertiary alkanolamines caused a more drastic decrease in degradation and a smaller decrease in NH_(3) emissions due to the steric hindrance within their *** increase in the number of amino groups in an amine caused an increase in both degradation and NH_(3) emission rates because these provided the reactive sites for the formation of free *** effect was not as large in alkyl-cyclic amines as in multi-alkylamines due to the ability of the former to resist oxidative ***,branched alkyl groups between amino and hydroxyl groups more drastically increased both the degradation and NH_(3) emission activities than branched alkyl groups located at the nitrogen atom.

关键词： amine degradation rate ammonia emission rate carbon capture amine structure oxidative degradation amines

Petrology and Geochemical Relationship of Birimian Gabbro-Diorite-Granodiorite Dykes in Basaltic Rocks at Butre Area, SW Ghana

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Journal of Geoscience and Environment Protection 2024年第2期12卷 107-130页

作者： Victor Graham George Mensah tetteh Department of Geological Engineering University of Mines and Technology Tarkwa Ghana

Granitoids at Butre area, south-western part of the Birimian of Ghana are gabbro to granodiorite which intruded comagmatic basalt and andesite of volcanic island arc setting. Differentiation was from probably mantle fractionates on tholeiitic basalt trend through gabbro-diorite and granodiorite. Yet, the diorite intruded into the volcanic rocks prior to plate collision. Plagioclase feldspars of labradorite to andesine compositions (An52 - An48), amphibole and pyroxene are in association with accessory tourmaline, actinolite, apatite and garnet. Relict amphibolite facies metamorphism is preserved in xenoliths in gabbro to diorite which show greenschist facies. Generally, plagioclase is partially altered to fine quartz, sericite and carbonates whereas chlorite and epidote are of amphibole alteration. These alterations are typical of carbonatisation but diorite shows partial carbonate-sericite alteration. Alterations followed granodiorite emplacement. Arsenopyrite and pyrite accompanied emplacement of diorite and granodiorite respectively while amphibolite facies metamorphism introduced magnetite;haematite and pyrrhotite accompanied greenschist facies metamorphism. Earlier opaque minerals possibly were consumed to form later minerals. All the rocks are LREE depleted (La/Sm chondrite normalised ratios of basalt = 0.8 to 2.5;andesite = 2.03;diorite = 1.95 to 3.1;gabbro-diorite = 0.9 to 2.05;granodiorite = 1.66);diorite, basalt and andesite are fairly enriched in HREE. Enrichment of FeOT, MgO, SiO2, CaO and depletion of TiO2, K2O and Zr might be linked with carbonitisation, sericitisation, chloritisation, silicification and sulphidation linked to gold mineralisations in the Birimian of Ghana.

关键词： Granitoids Petrography Alteration Metamorphism Geochemistry Butre

The Impact of Privatization on Terminal Efficiency: A Case Study of Tema Port

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Journal of Transportation Technologies 2024年第3期14卷 358-371页

作者： Bernard Kwei tetteh Calvin Elorm Atsunyo Alex Boateng College of Transport and Communications Shanghai Maritime University Shanghai China Department of Transport Regional Maritime University Accra Ghana

Port and terminal efficiency are of utmost importance to the container shipping industry due to their significance in enhancing the competitive advantage of ports within a region. Consequently, there have always been notable variations of studies around it. This paper analyzes the impact of privatization on terminal efficiency using the Port of Tema as a Case Study. The main objective of this paper is to analyze the efficiency trends of the public and private terminals in the port over the years. To achieve this objective, DEA-CCR methodology was employed to calculate the annual technical efficiency trends of the private and public terminals using four input variables and three output variables. The main results of the paper indicated that the public and private terminals were efficient for multiple years. However, the efficiency scores over the years demonstrated inconsistency, exhibiting notable fluctuations. The findings of this study will aid policymakers across the region on policies relating to the efficiency and ownership structure of ports and terminals.

关键词： Privatization Terminal Efficiency DEA Tema Port

Marijuana use and repeated attempted suicide among senior high school students in Ghana:Evidence from the WHO Global School-Based Student Health Survey,2012

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General Psychiatry 2020年第6期33卷 390-399页

作者： John tetteh George Ekem-Ferguson Swithin Mustapha Swaray Nuworza Kugbey emmanuel Nii-Boye Quarshie Alfred Edwin Yawson Department of Community Health University of Ghana Medical SchoolCollege of Health SciencesUniversity of GhanaAccraGhana Department of Psychiatry Korle Bu Teaching HospitalAccraGreater AccraGhana National Cardiothoracic Centre Korle Bu Teaching HospitalAccraGreater AccraGhana Department of Family and Community Health School of Public HealthUniversity of Health and Allied SciencesHohoeVolta RegionGhana Department of Psychology School of Social SciencesUniversity of Ghana College of HumanitiesAccraGreater AccraGhana

Background The association between substance use including marijuana use and attempted suicide has been well ***,little is known about marijuana use and its association with attempted suicide repetition among young people in low-income and middle-income *** This analysis was conducted to assess the factors associated with marijuana use and ascertain marijuana use as a determinant of repeated attempted suicide among senior high school(SHS)students in *** Data from the 2012 Global School-Based Student Health Survey in Ghana was used for this *** Poisson,Logistic and Probit models weighted with Mahalanobis distance matching within propensity calliper were employed separately to determine the hypothetical association between marijuana use and repeated attempted *** analysis was performed using Stata 16 and p<0.05 was deemed statistically *** The prevalence estimates of marijuana use and repeated attempted suicide among SHS students in Ghana were 3.4%(95%Cl:2.3 to 5.1)and 11.5%(95%Cl:9.1 to 14.4),*** prevalence of marijuana use was significantly associated with school grade,smoking exposure,parent smoker,alcohol intake and *** use was positively associated with repeated attempted suicide among SHS in Ghana correlation=0.23,p<*** attempted suicide among students who use marijuana was approximately threefold and fivefold significant compared with nonmarijuana use students,based on the Poisson(adjusted prevalence ratio:3.02;95%Cl:1.67 to 5.43,p<0.001)and Logistic(adjusted OR:5.06;95%Cl:3.19 to 11.64,p<0.001)estimates ***,the Probit model showed that marijuana use significantly increased the log count of repeated attempted suicide by 95%(ap:0.95;95%CI:0.49 to 1.41,p<0.001).Conclusion Marijuana use does not only influence the onset of suicidal attempts but also repeated attempted suicide among SHS students in *** attention is required for suicide

关键词： repetition smoke attempted

Local digital lending development and the incidence of deprivation in Kenya

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Financial Innovation 2023年第1期9卷 2856-2881页

作者： Godsway Korku tetteh University of Strathclyde 16 Richmond StreetGlasgowUK UNU‑MERIT Maastricht UniversityMaastrichtThe Netherlands

In the developing world,vulnerable communities often lack access to regular income sources to cope with unforeseen *** advancements in financial technology have enabled microcredit to be delivered via digital *** digital credit may quicken remote access to consumer credit without the need for collateral,little is known about its contribution to the welfare of underserved *** study examines the effects of local digital lending development on deprivation and explores the implications of these effects on rural *** results show a negative association between local digital lending development and food deprivation on one hand and health deprivation on the *** evidence suggests that local digital lending development can reduce the probability of food and health ***,the evidence reveals that inhabitants of rural communities benefit more from digital lending *** study recommends the decentralization of financial inclusion policies as a pathway to promote digital lending at the local level.

关键词： Microfinance Fintech Digital lending Deprivation

吸收能力和内在动机对学生双元绩效的影响：环境适应是否重要?

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吸收能力和内在动机对学生双元绩效的影响：环境适应是否重要?

作者： emmanuel TEYE tetteh 中国科学技术大学

学位级别：硕士

长期以来,组织学习学者和心理学家都把人的认知能力和自我激励作为宏观和微观层面上求知欲、学习和创新绩效的决定因素。然而,学生的吸收能力和内在动机如何影响他们感知的探索和开发绩效尚未得到充分的解决。此外,学生们如何努力平衡... 详细信息

长期以来,组织学习学者和心理学家都把人的认知能力和自我激励作为宏观和微观层面上求知欲、学习和创新绩效的决定因素。然而,学生的吸收能力和内在动机如何影响他们感知的探索和开发绩效尚未得到充分的解决。此外,学生们如何努力平衡探索与开发的权衡,以及他们的特定学术环境是否能够成为更好的机制,以实现理想的、预期的、动态的和新颖的教育成果,这一问题尚未得到解决。因此,本研究的目的是用实证的证据来了解和预测可能对高等学校学生探索和开发绩效产生独立和中介效果的心理认知因素。我们借鉴了吸收能力理论、自我决定理论和互动理论,提出了一个预测性的概念框架。通过在加纳背景下学生组织适应能力的中介作用,探讨吸收能力和内在动机对探索和开发的影响。我们采用了具有探索性的定量研究方法,对研究假设和研究问题进行了探讨。采用的定量调查是一种由定量统计分析支持的典型性调查,这是一种典型的实证范式。通过对加纳北部、阿克拉大区和中部地区部分公立大学和机构的在线调查,利用从学生中收集的419份有效数据得出结论,并使用结构方程建模技术(AMOS 24和SPSS软件)计算数据分析。我们根据方便抽样(也称为可用性抽样)对参与者进行抽样,这是一种非概率抽样方法。结果表明,虽然吸收能力对开发绩效没有直接的显著影响,但当组织适应作为吸收能力与开发关系的居间变量时,其影响更大。这意味着,学生不仅在是在具有更高的吸收能力的情况下,而且只有在能够适应自已的学术环境的情况下,才能取得探索性的成绩。研究结果还表明,吸收能力与开发绩效直接相关,而组织适应也表明,它在吸收能力和开发关系上起着重要的中介作用。研究结果还表明,吸收能力与组织适合度相关显著。此外,内在动机与组织适应呈正相关,同时也通过组织适应的中介作用间接地对探索和开发产生重大影响。这也意味着学生只有具备更高的内在动机和适应其学术环境的良好意愿,才能达到探索和开发的目的。最后我们发现组织适合性对开发绩效有直接影响。我们的研究通过实施一个预测性概念模型来了解这些可操作的研究变量之间的关系,从而在吸收能力、动机、环境适应和勘探开发文献方面取得了重要进展。具体来说,我们提供了一个清晰的概念适应的心理认知理论,互动适合和组织学习现象的高等教育和研究生产力领域。我们建议,根据研究结果,大学和研究机构可以创造有利的氛围支持学生的认知能力建设、心理增强、学术自主性、多样性平台、知识共享和技术机会,以此加强协作学习,并让学生有效适应环境。我们还强调了在考虑学术指导发展,以及在高等教育环境中探索和开发学生学习效率的心理认因素时,环境适应意识的重要性。

关键词：吸收能力动机组织适应探索开发灵活性结构方程模型(AMOS)

Non-inclusion of certified herbal medicines in the National Health Insurance Scheme affects patient utilization of the integrated herbal medicine services in Ghana

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Traditional Medicine Research 2022年第4期7卷 75-80页

作者： Anthony Nketia emmanuel Nakua Andrews William tetteh Kwesi P.Thomford Kwame O.Boadu Ama K.Thomford Department of Health Promotion Education and Disability StudiesSchool of Public HealthKwame Nkrumah University of Science and TechnologyKumasiGhana Department of Epidemiology and Biostatistics School of Public HealthKwame Nkrumah University of Science and TechnologyKumasiGhana Department of Pharmacognosy and Herbal Medicine University of Cape CoastKumasiGhana Department of Maternal and Child Health Kumasi South HospitalKumasiGhana Department of Biomedical Sciences University of Cape CoastKumasiGhana

Background:In 2011,Ghana piloted the integration of herbal medicine services into mainstream health care delivery in selected government hospitals across the *** date,however,no single certified herbal drug is generally covered by the national health insurance *** study evaluated the implications of out-of-pocket payment for prescriptions on the patronage of herbal medicine units in 3 selected government hospitals within Kumasi ***:A cross-sectional study on 413 participants was performed using a semi-structured ***:The majority of study respondents were female(54%),and the median age was 35 *** participants(83.1%)were aware that herbal medicine was integrated in the mainstream health care system of the *** the costs of certified herbal drugs,51.5%of respondents considered them very expensive;72.1%of the respondents believed that the costs of certified herbal drugs adversely affected the utilization of herbal units at government hospitals,which produced a positive correlation(r=0.5498).A total of 99.5%of the respondents recommended the inclusion of certified herbal drugs on the national health insurance drug ***:This study revealed that the costs of certified herbal medicines negatively affect utilization of herbal units at government *** improve the utilization of herbal units,certified herbal drugs dispensed at these units must thus be included in the national health insurance drug list.

关键词： omplementary and alternative medicines herbal medicine primary healthcare universal health coverage

Marijuana use and suicidal behaviours among school-going adolescents in Africa:assessments of prevalence and risk factors from the Global School-Based Student Health Survey

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General Psychiatry 2021年第4期34卷 32-43,I0010-I0013页

作者： John tetteh George Ekem-Ferguson emmanuel Nii-Boye Quarshie Swithin Mustapha Swaray Martin Amogre Ayanore Nana Ayegua Hagan Seneadza Kwaku Oppong Asante Alfred Edwin Yawson Community Health University of Ghana Medical SchoolAccraGhana Department of Psychiatry Korle Bu Teaching HospitalAccraGhana Department of Psychology School of Social SciencesUniversity of Ghana College of HumanitiesAccraGhana National Cardiothoracic Centre Korle Bu Teaching HospitalAccraGhana Department of Family and Community Health University of Health and Allied Sciences School of Public HealthHohoeGhana

Background Marijuana use among adolescents,including high school students,has been consistently reported to be associated with a high incidence of suicidal *** empirical research has been conducted on the propensity impact of marijuana use on suicidal behaviours in *** To assess factors associated with marijuana use and further quantify marijuana use as an associated factor of suicidal behaviours,including repeated attempted suicide,suicidal ideation and suicide planning,among high school students in *** A cross-sectional study was conducted among 32802 school-going adolescents using the Global School-Based Student Health Survey data from 10 African countries grouped into West Africa,North Africa,South-East Africa,South Africa and East Africa *** use and repeated attempted suicide were the main outcome *** employed double selection least absolute shrinkage and selection operator poisson regression model to assess risk factors associated with marijuana use and dominance analysis to establish ranked important and common risk *** probability weighting poisson regression adjustment was applied to assess *** The prevalence of marijuana use and repeated attempted suicide were 3.7%(95%CI:3.1 to 4.3)and 6.6%(95%CI:5.9 to 7.4),*** most important risk factor for marijuana use generally across the countries and specifically in three subregions was alcohol consumption,which constituted approximately 40%of the *** average treatment effect on the treated(ATT)indicated that marijuana use significantly increased the risk of suicidal ideation,suicide planning and repeated attempted suicide by 12%(ATT=0.12(95%CI:0.02 to 0.22)),18%(ATT=0.18(95%CI:0.13 to 0.22))and 31%(ATT=0.31(95%CI:0.20 to 0.41)),*** Marijuana use was significantly associated with suicidal behaviours(suicidal ideation,planning and repeated attempted suicide)among the *** achieve Sustainab

关键词： among translate attempted

Factors Affecting Procurement Performance in Building Construction Industry of Ghana

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Factors Affecting Procurement Performance in Building Constr...

作者： Gideon Mante tetteh 电子科技大学

学位级别：硕士

在一个竞争激烈、复杂的行业,比如需求量非常大的建筑施行业,有竞争力的价格、在预算内准时交付是非常重要的。在加纳的建筑行业,房屋项目交付方面存在一些问题,包括未在预期内完成工程、未在核定成本内完成工程、未达到要求的质量,以... 详细信息

在一个竞争激烈、复杂的行业,比如需求量非常大的建筑施行业,有竞争力的价格、在预算内准时交付是非常重要的。在加纳的建筑行业,房屋项目交付方面存在一些问题,包括未在预期内完成工程、未在核定成本内完成工程、未达到要求的质量,以及未达到权利人的满意度。采购不佳是导致上述问题的一个重要原因。本研究旨在评估影响加纳建筑业影响采购绩效的因素。研究所考虑的因素包括采购规划、采购程序、员工能力和资源分配。本研究描述性分析典型的研究计划。本次研究的对象是来自加纳阿克拉的10家注册建筑公司的320名员工。研究的目标群体是加纳阿克拉10家公司的高级管理人员、中级管理人员、采购工作人员和能够参与采购过程、职能和决策过程的其他成员。一份包含开放性和封闭性问题的问卷是为研究收集数据的主要工具。问卷调查共278份,回收率为86.8%。从研究结果来看,皮尔逊相关系数表明,采购计划与采购绩效之间存在正相关关系(r=0.138)。员工能力与采购绩效之间存在正相关关系(r=0.415)。采购程序与采购绩效之间存在正相关关系(r=0.093)。资源配置与采购绩效之间呈显著的正相关关系(r=0.714)。采用多重回归分析确定自变量(采购计划、采购流程、员工胜任力、资源配置)对因变量(采购绩效)的影响。员工能力和资源配置与(p<0.05)是影响采购绩效的最重要的因素。基于方差分析,显著性值为0.000,小于0.05,说明自变量对因变量有影响。F临界值(2.64)在5%显著性水平下记录,方差分析(13.075)大于F临界值。由此可见,本研究的总体目标已经实现。因此,资源配置、员工能力、采购计划与采购流程依次是影响加纳建筑业采购绩效的重要影响因素。这为加纳建筑业的管理者与实践者提供了一些有价值的管理建议。

关键词：采购绩效建筑与建筑业采购规划采购流程员工能力资源配置