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Study on Preparation of Nitrogen-Doped Hierarchically Porous and High-Performance Carbon Materials from Seaweed Biomass

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Journal of Renewable Materials 2022年第2期10卷 541-560页

作者： Kaihan Xie Yamin Hu stephen afonaa-mensah Chuan Yuan Bin Cao Shuang Wang Qian Wang School of Energy and Power Engineering Jiangsu UniversityZhenjiangChina Takoradi Technical University TakoradiGhana

Use Enteromorpha clathrate as a carbon and nitrogen precursor could obtain the N-doped porous carbon mate-rials by two-step *** this paper,the exogenous nitrogen(urea,melamine)and activating agents(KOH,ZnCl_(2))were employed for the production of higher-performance carbon materials from seaweed ***,BET,FTIR,XRD,XPS,Raman and ultimate analyses were carried out to investigate the morpho-structural and elemental peculiarities of the carbonaceous ***,cyclic voltammetry(CV),galvanostatic charge-discharge(GCD)and cyclic charge-discharge tests were carried out to examine the electrochemical properties of the *** results showed that electrochemical performance of the carbonaceous materials improved by adding the appropriate nitrogen *** improvement was observed under either condition,when the nitro-gen source and activating agent were melamine and ZnCl_(2) or urea and KOH,***,under the condition with KOH as the activator,the nitrogen content of carbon material without exogenous nitrogen was initially 1.46%.After the addition of urea or melamine,the nitrogen content increased to 4.86%and 6.18%,*** the condition with ZnCl_(2) as the activator,and without exogenous nitrogen,the nitrogen con-tent of carbon materials was initially 3.75%.However,after adding urea or melamine,the nitrogen content increased to 12.11%and 14.76%,*** carbonaceous materials(prepared from urea/KOH and mel-amine/ZnCl_(2))showed excellent gravimetric capacitances of 172 and 151.5 F/g at 1A/***,at a current density of 5 A/g,their specific capacitance retention rate reached 78.3%and 82.6%respectively after 1000 cycles.

关键词： Exogenous nitrogen incorporation N-doped porous carbon two-steps pyrolysis enteromorpha clathrate

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Neuropeptide cholecystokinin:a key neuromodulator for hippocampal functions

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Neural Regeneration Research 2025年第7期20卷 1991-1992页

作者： Fengwen Huang stephen Temitayo Bello Department of Neuroscience City University of Hong KongKowloon TongHong Kong Special Administrative RegionChina Center for Regenerative Medicine and Health Hong Kong Institute of Science&InnovationChinese Academy of SciencesHong Kong Special Administrative RegionChina

Spatial memory is crucial for survival within external surroundings and wild *** hippocampus,a critical hub for spatial learning and memory formation,has received extensive investigations on how neuromodulators shape its functions(Teixeira et al.,2018;Zhang et al.,2024).However,the landscape of neuromodulations in the hippocampal system remains poorly understood because most studies focus on classical monoamine neuromodulators,such as acetylcholine,serotonin,dopamine,and *** neuropeptides,comprising the most abundant neuromodulators in the central nervous system,play a pivotal role in neural information processing in the hippocampal ***(CCK),one of the most abundant neuropeptides,has been implicated in regulating various physiological and neurobiological statuses(Chen et al.,2019).CCK-A receptor(CCK-AR)and CCK-B receptors(CCK-BR)are two key receptors mediating the biological functions of CCK,both of which belong to class-A sevenfold transmembrane G protein-coupled receptors(Nishimura et al.,2015).CCK-AR preferentially reacts to sulfated CCK,whereas CCK-BR binds both CCK and gastrin with similar affinities(Ding et al.,2022).The expression patterns of CCK-AR and CCK-BR are distinct,implying that CCK has various functions in target *** instance,CCK-AR is widely expressed in the GI and brain subregions and is hence implicated in the control of digestive function and satiety ***,CCK-BR is abundantly and widely distributed in the central nervous system,which majorly regulates anxiety,learning,and memory(Ding et al.,2022).However,the roles of endogenous CCK and CCK receptors in regulating hippocampal function at electrophysiological and behavioral levels have received less attention.

关键词： abundant functions modulator

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Human induced pluripotent stem cell-derived therapies for regeneration after central nervous system injury

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Neural Regeneration Research 2025年第11期20卷 3063-3075页

作者： stephen Vidman Yee Hang Ethan Ma Nolan Fullenkamp Giles W.Plant Department of Neuroscience Ohio State UniversityColumbusOHUSA

In recent years,the progression of stem cell therapies has shown great promise in advancing the nascent field of regenerative *** the non-regenerative nature of the mature central nervous system,the concept that“blank”cells could be reprogrammed and functionally integrated into host neural networks remained *** work has also demonstrated the ability of such cells to stimulate intrinsic growth programs in post-mitotic cells,such as *** embryonic stem cells demonstrated great potential in treating central nervous system pathologies,ethical and technical concerns *** barriers,along with the clear necessity for this type of treatment,ultimately prompted the advent of induced pluripotent stem *** advantage of pluripotent cells in central nervous system regeneration is multifaceted,permitting differentiation into neural stem cells,neural progenitor cells,glia,and various neuronal *** precise spatiotemporal application of extrinsic growth factors in vitro,in addition to microenvironmental signaling in vivo,influences the efficiency of this directed *** the pluri-or multipotency of these cells is appealing,it also poses the risk of unregulated differentiation and teratoma *** of the neuroectodermal lineage,such as neuronal subpopulations and glia,have been explored with varying degrees of *** the risk of cancer or teratoma formation is greatly reduced,each subpopulation varies in effectiveness and is influenced by a myriad of factors,such as the timing of the transplant,pathology type,and the ratio of accompanying progenitor ***,successful transplantation requires innovative approaches to develop delivery vectors that can mitigate cell death and support ***,host immune responses to allogeneic grafts must be thoroughly characterized and further developed to reduce the need for *** to a clinical setting wi

关键词： axon regeneration central nervous system regeneration induced pluripotent stem cells neurotrauma regenerative medicine spinal cord injury stem cell therapy

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Assessment of anti mosquito measures in households and resistance status of Culex species in urban areas in southern Ghana:Implications for the sustainability of ITN use

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Asian Pacific Journal of Tropical Medicine 2013年第11期6卷 859-864页

作者： Andreas A Kudom Ben A mensah Jacob Nunoo Department of Entomology and Wildlife School of Biological Sciences.University of Cape CoastCape CoastGhana Department of Economics University of Cape CoastCape CoastGhana

Objective:To determine resistance status of Culex species to different class of insecticides and assess the major anti-mosquito strategies employed by urban households and their possible effects on malaria ***:Structured questionnaires were randomly administered to obtain information on demographic characteristics,measures that people use to prevent mosquito bites and their perception of where mosquitoes breed in their *** susceptibility assays were also carried out using WHO discriminating dosages of four insecticides from different chemical classes against Culex ***:Majority of respondents(54.75%) preferred the use of domestic insecticides in the form of aerosols and *** households that used domestic insecticides,the use of coil was most frequent(62.9%) with a mean(95%CI) of 9.18(8.99,9.37) coils per *** level of pyrethroid-resistance and multiple insecticide resistance in Culex species were also detected in some of the study ***:The excessive use of domestic insecticides and high level of resistance in Culex species observed in the study area has implications for the ITN component of the nation's malaria control program in more subtle *** will lose interest in the use of ITN when it fails to protect users from bites of resistant Culex *** use of domestic insecticides may also select resistance in both malaria vectors and Culex *** this account we recommend that nuisance mosquitoes must be controlled as part of malaria control programs to improve acceptance and utilization of ITN.

关键词： Culex species Insecticide resistance Nuisance mosquitoes ITN Malaria control Mosquito coil

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Classification-oriented dawid skene model for transferring intelligence from crowds to machines

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Frontiers of Computer Science 2023年第5期17卷 53-66页

作者： Jiaran LI Richong ZHANG Samuel mensah Wenyi QIN Chunming HU Department of Computer Science and Engineering Beihang UniversityBeijing 100191China Department of Computer Science University of SheffieldSheffieldS102TNUK

When a crowdsourcing approach is used to assist the classification of a set of items,the main objective is to classify this set of items by aggregating the worker-provided labels.A secondary objective is to assess the workers’skill levels in this process.A classical model that achieves both objectives is the famous Dawid-Skene *** this paper,we consider a third objective in this context,namely,to learn a classifier that is capable of labelling future items without further assistance of crowd *** extending the DawidSkene model to include the item features into consideration,we develop a Classification-Oriented Dawid Skene(CODS)model,which achieves the three objectives *** effectiveness of CODS on this three dimensions of the problem space is demonstrated experimentally.

关键词： crowdsourcing information aggregation lear-ning from crowds

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Degree of financialization and energy efficiency in Sub-Saharan Africa: do institutions matter?

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Financial Innovation 2020年第1期6卷 552-573页

作者： Philip Kofi Adom Franklin Amuakwa-mensah Salome Amuakwa-mensah Department of Development Policy School of Public Service and GovernanceGhana Institute of Management and Public Administration(GIMPA)AccraGhana Environment for Development University of GothenburgGothenburgSweden Department of Business Administration Technology and Social SciencesLulea University of TechnologyLuleaSweden Department of Economics Swedish University of Agricultural SciencesUppsalaSweden

The United Nations Sustainable Development Goal 7 emphasizes the need for economies around the world to double their efforts in energy efficiency *** is because improvements in energy efficiency can trigger economic growth and considered as one of the‘green’growth strategies due to its carbon free *** this end,some empirical studies have investigated the nexus between economic growth and energy efficiency,but the effects of the latter on financial indicators have not been sufficiently studied in the literature,at least in developing economies like *** study examines the effect of energy efficiency improvements on commercial bank profitability under different political regimes(i.e.,autocratic and democratic political regimes);something previous literature had *** study uses panel data,consisting of 43 African countries and the simultaneous System Generalized Method of *** found that energy efficiency improvement is more likely to induce higher bank profitability in political institutions with the characteristics of centralization of power compared with those with decentralization of ***,for the banking sector,the findings suggest that energy utilization behavior of clients should be included in the loan or credit valuation *** the government,the agenda of energy efficiency should be aggressively pursued while taking cognizance of creating a political environment that weans itself from a‘grandfathering’behavior.

关键词： Bank performance Energy efficiency Institution Sub-Saharan Africa

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Decay Resistance of Particleboards Manufactured with Four Agro-Forest Residues Using Cassava Starch and Urea Formaldehyde as Adhesives

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Journal of Agricultural Chemistry and Environment 2020年第4期9卷 240-254页

作者： Prosper mensah stephen Jobson Mitchual Mary Mamle Apetorgbor Kwasi Frimpong-mensah CSIR-Forestry Research Institute of Ghana KNUST Kumasi Ghana Department of Construction and Wood Technology Education University of Education Winneba Kumasi Campus Kumasi Ghana Department of Wood Science and Technology Kwame Nkrumah University of Science and Technology Kumasi Ghana

Many factors including depletion of the forest, environmental awareness, and generation of large quantities of agro-forest residues have increased the need to partially or wholly replace wood with agro-forest residue for particleboard production. This study assessed the decay resistance of particleboards produced from four agro-forest residues using cassava starch and urea formaldehyde as adhesives. Musa paradisiaca pseudostem, Theobroma cacao stem and pod, and sawdust of Ceiba pentandra were used for the study. Properties determined were: Weight loss, decay resistance rating and decay susceptibility index. These properties were evaluated after 12 weeks of exposure to Coriolopsis polyzona in accordance with ASTM D 2017-05. The results indicate that the weight loss for Musa paradisiaca pseudostem particleboard was least for both urea formaldehyde and cassava starch adhesives. Even though almost all the particleboards produced were classified as resistant or highly resistant to fungi attack, those produced with urea formaldehyde had better decay resistance properties than that of cassava starch. Furthermore, particleboards coated with synthetic polyvinyl lacquer had better resistance to fungi attack than the uncoated ones. At 5% level of significance, the agro-forest residue, adhesive and surface finish as well as their interactions had significant effects on decay resistance of the particleboards produced. It is recommended that further studies which aim at determining the effect of combination of the agro-forest residues and that of urea formaldehyde and cassava starch be conducted to determine their effects on decay properties of particleboards.

关键词： Agro-Forest Residue Cassava Starch Decay Resistance Particleboard Urea Formaldehyde

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Vegetation structure,dominance patterns and height growth in an Afromontane forest,Southern Africa

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Journal of Forestry Research 2020年第2期31卷 453-462页

作者： Sylvanus mensah Anthony Egeru Achille Ephrem Assogbadjo Romain GleleKakai Laboratoire de Biomathematiques et d’Estimations Forestieres Facultedes Sciences AgronomiquesUniversite d’Abomey-Calavi04 BP 1525 CotonouBenin Regional Universities Forum for Capacity Building in Agriculture Makerere UniversityP.O Box 16811WandegeyaKampalaUganda Laboratoire d’Ecologie Appliquee Facultedes Sciences AgronomiquesUniversite d’Abomey-Calavi03 BP 1974 CotonouBenin

Information on forest structure is fundamentally important to track successional vegetation dynamics for efficient forest *** study reports on vegetation characteristics,dominance patterns and species height growth in a northern mistbelt forest type in South *** alpha-diversity indices(species richness and Shannon-Weiner diversity),structural vegetation parameters(tree density and basal area),and species importance value index were *** class distribution and height-diameter allometry were further examined for the overall stand and most important *** densities(472.0±43.5 and 605.3±28.1 trees ha^-1 for C 5 cm to\10 cm and C 10 cm dbh(diameter at breast height)classes,respectively)and basal area values(1.99±0.19 and 48.07±3.46 m^2 ha^-1,respectively)are comparable to other Afromontane forests in East *** overall stand showed an inverted-J shaped distribution pattern which is a typical feature of stand size class distribution in most natural *** ecologically important species also exhibited an inverted-J shaped distribution pattern,suggesting good regeneration and recruitment *** were significant differences in species on height,reflecting species-specific height growth patterns,possibly a result of intrinsic growth potential and competitive *** present study suggests that conservation and management policies,including protection of surrounding land uses against fire,contribute to maintaining a successful recovery of these ***,it should be noted that these forests may be experiencing relatively slow dynamic flux as a result of the overmature state of some trees with several years under relatively strict protection.

关键词： Diversity Population structure Species composition Size class distribution

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Renewable energy in Benin: current situation and future prospects

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Clean Energy 2023年第5期7卷 952-961页

作者： Romain Akpahou Lena D.mensah David A.Quansah Department of Mechanical Engineering Kwame Nkrumah University of Science and Technology(KNUST)KumasiGhana The Brew-Hammond Energy Centre Kwame Nkrumah University of Science and Technology(KNUST)KumasiGhana

To provide clean energy at a lower cost to their citizens,all nations of the world are striving to increase their energy production in an environmentally friendly *** has also joined this dynamic by considerably increasing its green energy production efforts in recent *** country has a huge undeveloped renewable-energy(RE)potential that can contribute considerably to its national energy production *** paper summarizes the current RE situation in Benin and examines its future *** current energy situation of the country is discussed,followed by an examination of its electricity demand-and-supply *** country has been found to depend heavily on natural gas and petroleum products from neighbouring countries and has~41%of national electricity ***,the government is taking considerable steps to implement RE projects in the *** study analyzes government targets in the energy sector with existing policies and institutional *** are made for the benefit of the government,the private sector and other actors in order to developing the RE potential of Benin.

关键词： Benin electricity demand energy policy future prospect renewable energy

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Effect of Post Heat Treatment on Corrosion Resistance of Phytic Acid Conversion Coated Magnesium

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Journal of Materials Science & Technology 2013年第2期29卷 180-186页

作者： R.K. Gupta K. mensah-Darkwa D. Kumar Engineering Research Center for Revolutionizing Metallic Biomaterials (ERC-RMB) Department of Mechanical Engineering North Carolina A&T State University 1601 East Market Street Greensboro NC 27411 USA

An environment friendly chemical conversion coating for magnesium was obtained by using a phytic acid solution. The effect of post-coating 1heat treatment on the microstructures and corrosion properties of phytic acid conversion coated magnesium was investigated. It was observed that the microstructure and corrosion resistive properties were improved for the heat treated samples. The corrosion current density for bare magnesium, phytic acid conversion coated magnesium, and post-coating heat treated magnesium was calculated to be 2.48 ×10^-5, 1.18×10^-6, and 9.27 × 10^7 A/cm^2, respectively. The lowest corrosion current density for the heat treated sample indicated its highest corrosion resistive effect for the magnesium. The maximum corrosion protective nature of the heat treated sample was further confirmed by the largest value of impedance in electrochemical impedance spectroscopy studies.

关键词： Magnesium Phytic acid Corrosion Impedance spectroscopy Scanning electron microscopy

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