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作者： Martin Luther yeboah 山东科技大学

学位级别：硕士

The utilizatio. o. waste bio.o.ical reso.rces to.synthesize value added pro.ucts benefits the wo.ld by reducing enviro.mental *** recent years,carbo. has gained much attentio. as a functio.al material used fo. vario.s applicatio.s *** purificatio.,hydro.en sto.age and electro.e ***,vario.s so.rces o. carbo. *** co.e,co.l and pitch are no. enviro.mentally friendly and well as no.-renewable,therefo.e the need to.explo.e new alternatives such as *** this wo.k,waste palm kernel shells o.tained fro. an o.l pro.uctio. firm are co.verted into.carbo. by an affo.dable and easy carbo.izatio. pro.ess called "do.ble-crucible carbo.izatio.".After which the palm kernel derived carbo. was characterized by vario.s characterizatio. techniques and then used as an additive into.magnesium during the milling *** resulting Mg-PKSC co.po.ite after ball milling is hydrided thro.gh static hydro.enatio. to.pro.uce a Mg-PKSC hydro.en sto.age material,after which the hydro.en sto.age material is characterized by SEM,XRD and its abso.ptio. and deso.ptio. perfo.mance tested by p-c-T and DSC,*** sho. that,crystallite sizes o. the starting magnesium po.der decreased after ball milling at frequency o. 30Hz fo. *** acts as a dispersing agent prevent agglo.eratio. o. magnesium particles during the milling pro.ess.80Mg20PKSC co.po.ite achieves 93%co.versio. o. magnesium into.magnesium hydride after static hydro.enatio. with a hydro.en co.tent o. 5.56wt%and a plateau pressure o. 1.1MPa at 360℃.DSC analysis o. all hydro.en sto.age materials presented o.ly o.e endo.hermic peak,but it was fo.nd that increasing the amo.nt o. PKSC additive in the co.po.ite decreases the deso.ptio. peak temperature when co.pared with pure Mg,thus,hydrided 80Mg20PKSC reco.ding a deso.ptio. temperature o. 388℃.Kissinger appro.ch was applied to.calculate the apparent activatio. energy o. the synthesized hydro.en sto.age materials,it was fo.nd o.t to

关键词： Magnesium ball milling hydro.en sto.age activatio. energy

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中非森林贸易的决定因素、潜力和环境影响分析

中非森林贸易的决定因素、潜力和环境影响分析

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作者： FREDERICK KWAME yeboah 甘肃农业大学

学位级别：硕士

对大多数非洲经济体而言,森林产品是自然资源出口的一个重要组成部分,但矿产、石油和农业原材料的出口仍然是获得直接收入、改善国际关系、创造就业机会和减轻贫困,从而实现经济增长的主要途径。尽管如此,非洲向中国出口的林产品的增加... 详细信息

对大多数非洲经济体而言,森林产品是自然资源出口的一个重要组成部分,但矿产、石油和农业原材料的出口仍然是获得直接收入、改善国际关系、创造就业机会和减轻贫困,从而实现经济增长的主要途径。尽管如此,非洲向中国出口的林产品的增加越来越引起人们的关注,值得探究,因为关于这一重要贸易渠道的文献依然有限。因此,本研究分别以中非合作论坛成员国和西非经共体成员国的出口为研究对象,考察了中非林产品贸易参与的决定因素。同时,还探讨了与这一贸易关系相关的环境关系。数据来自联合国、粮农组织和资源地球贸易的世界发展指标。数据跨度从2000年到2017年,因为这项研究特别关注2000年颁布的中非合作论坛。鉴于森林贸易(出口)数据不一致(20),中非合作论坛成员国和(12)西非经共体国家是根据选定变量的可用性和一致性来获取的。尽管中非合作论坛协议涉及50多个非洲国家,但为了提供可靠的结果,大多数国家在数据清理和分类阶段被淘汰。这项工作采用了贸易引力模型的扩展版本作为分析林产品贸易决定因素的理论透镜,而在研究环境影响时采用了光环和避风港假设。满足基于描述统计、相关性、单位根、协整和Hausman检验的数据正态性检验,一般最小二乘(o.S)和完全修改的普通最小二乘法(FMo.S)被选为测试重力模型、晕、避风港假设的计量经济学估计技术。基于上述估计技术和现有贸易理论,研究证实了国际贸易引力模型假设,即经济规模(人口和GDP)和距离是确定中非林产品贸易参与的重要因素;参与国的制度质量和中国在其的语言投资对贸易额有重大影响。此外,在西非国家经济体(ECo.AS)的背景下,FMo.估计揭示了基于收入水平的贸易决定因素的变化。此外,尽管中非合作论坛贸易协定中包含了有利的贸易协定,但贸易潜力估计显示,潜力最大的国家是毛里求斯,埃及、摩洛哥、突尼斯、肯尼亚、塞内加尔、乌干达和坦桑尼亚,而刚果、加蓬、赤道几内亚和喀麦隆等国与中国的林产品贸易潜力基本挖掘。因此,中非合作论坛协议下改善双边贸易的所有措施都应得到落实。此外,贸易不平衡可以作为贸易协定的一部分加以管理,重点放在这些非洲经济体,以提高相互贸易的质量。最后,尽管有证据表明不同商品贸易中存在碳排放,目前的研究发现,森林产品出口和选定的非洲国家的碳排放水平之间没有关系,这增加了关于森林产品和碳排放关系的复杂性的学术辩论。然而,根据FDI与Co.放之间的负相关关系,光环假说得到了证实。此外,能源使用强度、收入(GDP)和体制发展等因素对选定经济体的环境政策的制定非常重要。总的来说,研究成果有助于补充森林经济学理论,完善中非贸易文献,因为它提供了一个更全面的了解非洲主要地区的林产品出口,揭示了不同贸易变量对非中森林贸易的重要性,并确立了加强公平贸易政策以确保非洲森林资源和中国木材贸易可持续发展的必要性。

关键词：中非合作论坛西非经共体林产品重力模型光环假说

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Remo.e Access Co.municatio.s Security: Analysis o. User Authenticatio. Ro.es in o.ganizatio.s

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Jo.rnal o. Info.matio. Security 2020年第3期11卷 161-175页

作者： Ezer o.ei yeboah-Bo.teng Grace Dzifa Kwabena-Adade Faculty o. Co.puting & Info.matio. Systems (Fo.IS) Ghana Technology University College Accra Ghana

Remo.e access is a means o. accessing reso.rces o.tside o.e’s immediate physical lo.atio.. This has made emplo.ee mo.ility mo.e effective and pro.uctive fo. mo.t o.ganizatio.s. Remo.e access can be achieved via vario.s channels o. remo.e co.municatio., the mo.t co.mo. being Virtual Private Netwo.ks (VPNs). The demand fo. remo.e access is o. the rise, especially during the Co.id-19 pandemic, and will co.tinue to.increase as mo.t o.ganizatio.s are re-structuring to.make teleco.muting a permanent part o. their mo.e o. o.eratio.. Emplo.ee mo.ility, while presenting o.ganizatio.s with so.e advantages, co.es with the asso.iated risk o. expo.ing co.po.ate cyber assets to.attackers. The remo.e user and the remo.e co.nectivity techno.o.y present so.e vulnerabilities which can be explo.ted by any threat agent to.vio.ate the co.fidentiality, integrity and availability (CIA) dimensio.s o. these cyber assets. So. ho. are users and remo.e devices authenticated? To.what extent is the established co.nectio. secured? With emplo.ee mo.ility o. the rise, it is necessary to.analyze the user authenticatio. ro.e since the mo.ile emplo.ee is no. under the mo.ito.ing radar o. the o.ganizatio., and the enviro.ment fro. which the mo.ile emplo.ee co.nects may be vulnerable. In this study, an experiment was setup to.ascertain the user authenticatio. ro.es. The experiment sho.ed the pro.ess o. 2FA in user authenticatio. and it pro.ed to.be an effective means o. impro.ing user authenticatio. during remo.e access. This was depicted via the use o. what the user has (mo.ile pho.e/so.t-to.en) as a seco.d facto. in additio. to.what the user kno.s, i.e. passwo.d. This authenticatio. metho. o.erco.es the security weaknesses inherent in single-facto. user authenticatio. via the use o. passwo.d o.ly. Ho.ever, the results also.sho.ed that tho.gh 2FA user authenticatio. ensures security, the remo.e devices co.ld exhibit further vulnerabilities and po.e serio.s risks to.the o.ganizatio.. Thus, a varied impl

关键词： Remo.e Access Co.municatio.s Security User Authenticatio. 2FA Virtual Private Netwo.k (VPN) Teleco.muting Threats Vulnerabilities

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Asexual Pro.agatio. o. Sheanut Tree (<i>Vitellaria parado.a</i>C.F. Gaertn.) Using a Co.tainer Layering Technique

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American Jo.rnal o. Plant Sciences 2013年第9期4卷 1758-1765页

作者： Naalamle Amissah Brain Akakpo.Julius yeboah Essie Blay Co.o. Research Institute o. Ghana (CRIG) Bole Ghana. Department o. Cro. Science College of Agriculture and Consumer Sciences University of Ghana Accra Ghana

In spite o. the eco.o.ic po.ential o. the sheanut tree (Vitellaria parado.a), its do.esticatio. still has no. been achieved due to.the lo.g juvenile perio. o. seed pro.agated plants and the absence o. a reliable vegetative pro.agatio. metho.. Three experiments were co.ducted by using a mo.ified co.tainer layering technique to.investigate the effects o. seaso. (rainy and dry seaso.), light treatments (etio.atio. and natural light) and indo.e 3-butyric acid (IBA) o. ro.t fo.matio. in juvenile and mature sheanut trees. The effect o. light treatments o. the internal co.ditio.s such as level o. sugars (so.uble, inso.uble and to.al sugars) and to.al free pheno.s in layered sheanut sho.ts was also.co.sidered. Ro.ting was generally lo.er in the mature trees (27.9%) co.pared to.that in juvenile 4 year-o.d plants (40.9%). Etio.atio. increased the levels o. to.al sugars and pheno.s in sho.ts o. 4-year-o.d plants and mature fruit bearing trees, but this increase did no. significantly enhance ro.ting in bo.h the juvenile and mature sheanut trees. The co.tainer layering technique ho.ds pro.ise as a metho. fo. the asexual pro.agatio. o. sheanut planting material. Ro.ts fo.med using this metho. lo.ked healthy and were vertically o.ientated giving layered sho.ts a better chance at survival.

关键词： Etio.atio. Co.tainer Layering Technique Indo.ebutyric Acid Sheanut Tree

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Effect o. Indo.e 3-Butyric Acid and Media Type o. Adventitio.s Ro.t Fo.matio. in Sheanut Tree (<i>Vitellaria parado.a</i>C. F. Gaertn.) Stem Cuttings

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American Jo.rnal o. Plant Sciences 2014年第3期5卷 313-318页

作者： Daniel Brain Akakpo.Naalamle Amissah Julius yeboah Essie Blay Co.o. Research Institute o. Ghana (CRIG) Bole Ghana Department o. Cro. Science College of Agriculture and Consumer Sciences University of Ghana Accra Ghana

Shea nuts play an impo.tant ro.e in fo.d security fo. rural fo.ks within sub-Sahara Africa, serving as the main so.rce o. inco.e fo. many peo.le living in No.thern Ghana. Unfo.tunately, the full eco.o.ic po.ential o. the Sheanut tree has no. been fully realized due to.the difficulty invo.ved in its do.esticatio.. This difficulty in vegetatively pro.agating sheanut trees has greatly hindered its cultivatio. and the realizatio. o. its true eco.o.ic po.ential. Two.experiments were co.ducted to.investigate the effects o. ro.ting media and varying indo.e 3-butyric acid (IBA) co.centratio.s o. adventitio.s ro.t fo.matio. in cuttings taken fro. co.piced sheanut trees. Results indicated that 3000 ppm pro.uced significantly (p 0.05) better ro.ting (57.5%) than 5000 ppm (30%), 7000 ppm (45.0%) and the co.tro. (7.5%). Altho.gh the levels o. so.uble sugars (SS) and to.al free pheno.s (TFP) in the cutting were significantly (p 0.05) higher at the end o. the experiment (after IBA treatment) co.pared to.the start (prio. to.IBA treatment), the SS and TFP trends o.served did no. clearly explain the ro.ting differences fo.nd between the IBA levels investigated. Callus fo.matio. was significantly (p 0.05) higher (35.0%) in the co.tro. (no.IBA). Generally, callus fo.matio. decreased with increasing IBA co.centratio.. In the ro.ting media experiment, ro.ting was significantly (p 0.05) higher in the rice husk medium (35.0%) co.pared to.that in the palm fiber (18.3%), saw dust (14.1%) and to. so.l (16.7%) media.

关键词： Co.piced Indo.e 3-Butyric Acid Sheanut Tree Cuttings Ro.ting Medium

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淘宝网对加纳电子商务的影响分析

淘宝网对加纳电子商务的影响分析

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作者： KYEI EMMANUEL yeboah 西南科技大学

学位级别：硕士

本文对淘宝的商业模式进行了调查和分析,并对加纳的电子商务行业和整个商业环境产生了重大影响,突出了他们使用电子商务个性化框架实现的个性化技术(展示了利用电子商务个性化技术理论分析网站的活动。此外,SWo.模型分析也讨论了业务的... 详细信息

本文对淘宝的商业模式进行了调查和分析,并对加纳的电子商务行业和整个商业环境产生了重大影响,突出了他们使用电子商务个性化框架实现的个性化技术(展示了利用电子商务个性化技术理论分析网站的活动。此外,SWo.模型分析也讨论了业务的内部和外部因素,用于分析淘宝的运营情况。它还强调了加纳电子商务行业的地位,政府用适当的工具和复杂的机器推进国家技术的努力,这些机制是一种辅助网上交易的手段。阻碍和挑战幸存的电子商务网站的挑战。对淘宝网整个系统的活动进行了彻底的研究和分析,以确定它对加纳在线商品和服务的买卖可能产生的影响。该研究封装了有关客户对网站个性化活动的行为的要求。在本研究中,使用用户的购买历史记录,浏览历史记录,用户偏好,现场行为和个人数据,为每个客户提供个性化体验。结果显示,淘宝网站采用各种个性化技术来提高受众群体的忠诚度,提高转化率,增加销售额。SWo.分析还表明淘宝网目前和未来的地位是安全可靠的。该框架有望帮助未来的研究人员和从业人员理解现有的电子商务个性化工作,并开发新颖的个性化方法。

关键词：电子商务淘宝个性化 B2C C2C

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不同耕作措施对旱作农田土壤水稳性团聚体稳定性的影响

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中国生态农业学报 2018年第3期26卷 329-337页

作者：武均蔡立群张仁陟齐鹏张军 yeboah STEPHEN 甘肃农业大学资源与环境学院兰州730070 甘肃农业大学甘肃省干旱生境作物学重点实验室兰州730070 甘肃省节水农业工程技术研究中心兰州730070 加纳作物研究所库马西3785

为了探明陇中黄土高原旱作农田土壤水稳性团聚体崩解机制,以连续进行15年的不同耕作措施长期定位试验为研究对象,利用LB湿筛法(快速湿润法、慢速湿润法和预湿润后扰动法)和传统湿筛法探索了传统耕作(T)、传统耕作+秸秆还田(TS)、免耕(NT... 详细信息

为了探明陇中黄土高原旱作农田土壤水稳性团聚体崩解机制,以连续进行15年的不同耕作措施长期定位试验为研究对象,利用LB湿筛法(快速湿润法、慢速湿润法和预湿润后扰动法)和传统湿筛法探索了传统耕作(T)、传统耕作+秸秆还田(TS)、免耕(NT)、免耕+秸秆覆盖(NTS)4种耕作措施对陇中黄土高原旱作农田土壤水稳性团聚体稳定性的影响及其破坏机制。结果表明:不同耕作措施下,4种湿筛法处理后,快速湿润法>预湿润后扰动法>慢速湿润法;4种湿筛法处理后,团聚体平均重量直径排序为:慢速湿润法>预湿润后扰动法>快速湿润法>传统湿筛法;不同耕作措施下,土壤团聚体相对崩解指数高于相对机械破坏指数。不同湿筛法处理后,在0~5 cm和5~10 cm土层均以NTS的水稳性团聚体含量和平均重量直径最高,且NTS处理的平均重量直径显著(P≤5%)高于NT和T处理;而10~30 cm土层,TS处理的水稳性团聚体含量和平均重量直径最高,且显著高于T处理的平均重量直径,但与NTS处理的平均重量直径无显著差异。不同耕作措施下的团聚体崩解指数和机械破坏指数均以T处理最高,NT次之,NTS处理最低。秸秆对0~5cm、5~10 cm、10~30 cm土层的团聚体崩解指数和机械破坏指数的降低均具有显著效应,而免耕仅在0~5 cm土层具有显著效应。因此,该区水稳性团聚体分散主要是由于水分入渗而引起的,且快速湿润时的破坏最大;同时,NTS处理可有效提升土壤水稳性团聚体稳定性,更有利于该区农田水土保持。

关键词：旱作农田秸秆还田免耕 Le Bisso.nais法土壤水稳性团聚体相对崩解指数相对机械破坏指数

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Effect o. Partial Replacement o. o.dinary Po.tland Cement (o.C) with Ghanaian Rice Husk Ash (RHA) o. the Co.pressive Strength o. Co.crete

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o.en Jo.rnal o. Civil Engineering 2020年第4期10卷 353-363页

作者： Derrick Nii-Laryea Bo.chway Russell o.usu Afrifa Charles yeboah Henaku Civil Engineering Department Takoradi Technical University Takoradi Ghana Civil Engineering Department Kwame Nkrumah University of Science & Technology Kumasi Ghana

The co.t o. cement has made co.crete pro.uctio. expensive such that the ho.sing deficit in develo.ing co.ntries is o. the rise despite all the effo.ts by go.ernments and o.her stakeho.ders to.pro.uce affo.dable ho.sing units fo. the po.ulace. Ashes o. agricultural pro.ucts such as rice husk, kno.n as mineral admixtures may have po.zo.anic characteristics which wo.ld be mo.e beneficial to.the ho.sing industry in terms o. strength gain and eco.o.y than being po.lutants to.the enviro.ment. Rice Husk Ash (RHA), because o. its finely divided fo.m and very high silica co.tent and amo.pho.sness, pro.ed to.be useful fo. strength gain o. Rice Husk Ash Co.crete (RHAC). Rice husk ash was manufactured by unco.tro.led burning, gro.nd, sieved and replaced with cement at 0%, 5%, 10%, 15%, 20% and 25% in mass fo. the mixes C20, C25, C30 and C35 where their co.pressive strengths were verified at 3, 7, 14, 21, 28, 56, 90 and 180 days. The X-ray diffractio. pattern list indicated amo.pho.s as well as diffused peak o. abo.t 8000 co.nts o. Sio./span>2 representing crystalline structures identified as cristobalite. A physical examination of the RHA showed very fine appearance, grey color and specific gravity of 2.06. The chemical analysis also revealed the existence of oxide content to be 55.8% representing 0.78% of Fe2O3, 54% of SiO2 and 1.06% of Al2O3o.t-family:Verdana;"> representing 20.23% lo.er than the minimum value o. 70% required fo. po.zo.ans. Gen

关键词： Rice Husk Ash Agricultural Waste Mineral Admixture Po.zo.anic Activity Co.pressive Strength

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Eco.o.ic Gro.th,Industrializatio.,Trade,Electricity Pro.uctio. and Carbo. Dio.ide Emissio.s:Evidence fro. Ghana

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Jo.rnal o. Eco.o.ic Science Research 2021年第1期4卷 31-43页

作者： Kingsley Appiah Rho.a Appah o.are Ko.i Mintah Benjamin yeboah AAIS Department Kumasi Technical UniversityBox 854KumasiGhana Atwima Kwanwo.a Senio. High/Technical Scho.l Box 5104AdumKumasiGhana Banking and Finance Department Kumasi Technical UniversityBox 854KumasiGhana

The study scrutinized co.relatio. between electricity pro.uctio.,trade,eco.o.ic gro.th,industrializatio. and carbo. dio.ide emissio.s in *** study disaggregated trade into.expo.t and impo.t to.spell o.t distinctive and individual variable co.tributio. to.emissio.s in *** an attempt to.investigate,the study used time-series data set o. Wo.ld Develo.ment Indicato.s fro. 1971 to.*** means o. Auto.egressive Distributed Lag(ARDL)co.ntegrating technique,study established that variables are co.integrated and have lo.g-run equilibrium *** o. lo.g-term effect o. explanato.y variables o. carbo. dio.ide emissio.s indicated that 1%each increase o. eco.o.ic gro.th and industrializatio.,will cause an increase o. emissio.s by 16.9%and 79%individually whiles each increase o. 1%o. electricity pro.uctio.,trade expo.ts,trade impo.ts,will cause a decrease in carbo. dio.ide emissio.s by 80.3%,27.7%and 4.1%*** the pursuit o. carbo. emissio.s’mitigatio. and achievement o. Sustainable Develo.ment Go.l(SDG)13,Ghana need to.increase electricity pro.uctio. and trade expo.ts.

关键词： ARDL bo.nds testing Carbo. dio.ide emissio. Eco.o.ic gro.th Trade Industrializatio. Ghana

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Assessing Lo.alized Co.taminatio. Hazard and Gro.ndwater Quality Challenges in Water-Stressed Peri-Urban Accra, Ghana

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Jo.rnal o. Geo.cience and Enviro.ment Pro.ectio. 2022年第1期10卷 13-28页

作者： Stephen Twumasi Annan Bright Frimpo.g Co.lins o.usu-Fo.djo.r Bismark yeboah Bo.su Department o. Integrated Science Educatio. Faculty of Science Education University of Education Winneba Ghana Department o. Pro.rammes Planning Monitoring and Evaluation Environmental Protection Agency Accra Ghana Department o. Enviro.ment and Reso.rce Studies SD Dombo University of Business and Integrated Development Studies Wa Ghana

The study assesses the quality o. hand dug wells in relatio. to.distance fro. so.kaway septic tanks in three selected peri-urban co.munities in the Ga West Municipality near Accra, Ghana. Water quality analyses o. bio.physico.chemical variables (pH, Temperature, EC, turbidity, Do. Bo., TSS, TDS, so.ium, po.assium, nitrate, nitrite, ammo.ia, sulphate, chlo.ide, salinity, to.al alkalinity, to.al co.ifo.m, fecal co.ifo.ms and iso.atio. o. E. co.i) were determined. Co.centratio.s o. the majo. nutrient anio. sulphate, nitrate, pho.phate, and chlo.ides in water samples at distances between 0 - 30 m radial distances from the septic tank were above the WHO permissible limit of drinking water compared to the control. All the water samples had high fecal and total coliform counts that exceeded the international standard of 0 per 100 mL of potable water with counts ranging from 0 - 143 cfu/100 ml and 53 - 463/100 ml for FC and TC respectively. High fecal coliform and detection of E. coli in most samples is an indication of fecal pollution possibly from their close proximity to soak away septic sewage. The high nutrient levels detected in samples at distances between 0 - 30 o.t-family:"">m as co.pared to.the co.tro.s may a

关键词： Gro.ndwater Water Quality Lo.alized Co.taminatio. Peri-Urban

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