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Biomass-Derived Carbon Heterostructures Enable Environmentally Adaptive Wideband Electromagnetic Wave Absorbers

Nano-Micro Letters 2022年第1期14卷 210-225页

作者： Zhichao Lou Qiuyi Wang ufuoma ikara Rajdeep SMamtani Xiaodi Zhou Huiyang Bian Zhihong Yang Yanjun Li Hualiang Lv Solomon Adera Xiaoguang Wang Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037People’s Republic of China Willian G.Lowrie Department of Chemical and Biomolecular Engineering The Ohio State UniversityColumbusOH 43210USA Institute of Materials Research and Engineering Agency for SciencesTechnology and ResearchSingaporeSingapore Sustainability Institute The Ohio State UniversityColumbusOH 43210USA Department of Mechanical Engineering University of MichiganAnn ArborMI 48109USA

Although advances in wireless technologies such as miniature and wearable electronics have improved the quality of our lives,the ubiquitous use of electronics comes at the expense of increased exposure to electromagnetic(EM)*** to date,extensive efforts have been made to develop high-performance EM absorbers based on synthetic ***,the design of an EM absorber with both exceptional EM dissipation ability and good environmental adaptability remains a substantial ***,we report the design of a class of carbon heterostructures via hierarchical assembly of graphitized lignocellulose derived from ***,the assemblies of nanofibers and nanosheets behave as a nanometer-sized antenna,which results in an enhancement of the conductive *** addition,we show that the composition of cellulose and lignin in the precursor significantly influences the shape of the assembly and the formation of covalent bonds,which affect the dielectric response-ability and the surface hydrophobicity(the apparent contact angle of water can reach 135°).Finally,we demonstrate that the obtained carbon heterostructure maintains its wideband EM absorption with an effective absorption frequency ranging from 12.5 to 16.7 GHz under conditions that simulate the real-world environment,including exposure to rainwater with slightly acidic/alkaline pH ***,the advances reported in this work provide new design principles for the synthesis of high-performance EM absorbers that can find practical applications in real-world environments.

关键词： Electromagnetic dissipation Carbon heterostructure Environment adaptability Bamboo Lignocellulose

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Optimization of bio-oil production parameters from the pyrolysis of elephant grass (Pennisetum purpureum) using response surface methodology

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Clean Energy 2024年第5期8卷 241-251页

作者： Sunday C.Ikpeseni Samuel O.Sada ufuoma J.Efetobor Henry O.Orugba Mathias Ekpu Hilary I.Owamah Jeremiah L.Chukwuneke Solomon Oyebisi Uche P.Onochie Department of Mechanical Engineering Delta State UniversityP.M.B.1AbrakaNigeria Department of Mechanical Engineering Delta State PolytechnicP.M.B.3Otefe-OgharaNigeria Department of Chemical Engineering Delta State UniversityP.M.B.1AbrakaNigeria Department of Civil Engineering Delta State UniversityP.M.B.1AbrakaNigeria Department of Mechanical Engineering Nnamdi Azikiwe UniversityP.M.B.2025AwkaNigeria Department of Civil Engineering Covenant UniversityP.M.B.1023OttaNigeria Department of Civil Engineering The University of the South PacificP.M.B.9072SuvaFiji Department of Mechanical Engineering Delta State University of Science and TechnologyP.M.B.5OzoroNigeria

The need to increase bio-oil yield from biomass and enhance its fuel properties has driven research into optimizing the pyrolysis *** study investigated the influence of three key process parameters—temperature,heating rate,and nitrogen flow rate—on the pyrolysis of elephant grass(Pennisetum purpureum)in a fixed-bed *** surface methodology was used to study the im-pact of the aforementioned variables on bio-oil yield to improve its production *** analysis of the biomass revealed 79.24 wt%volatile matter,14.22 wt%fixed carbon,and 5.86%ash,with ultimate analysis showing 45.44%carbon,5.59%hydrogen,and 40.95%*** high volatile matter content and favourable carbon and hydrogen percentages indicate that elephant grass is a vi-able energy source due to its potential for high bio-oil yield and energy *** resulting bio-oil exhibited a higher heating value of 20.9 MJ/kg,indicating its suitability for various heating applications.A second-order regression model was developed for bio-oil yield,with optimal conditions identified as a temperature of 550°C,a heating rate of 17°C/min,and a nitrogen flow rate of 6 ml/*** study achieved an optimal bio-oil yield of 59.03 wt%,and the model’s high R²value of 0.8683 from analysis of variance analysis confirmed its predictive *** research highlights elephant grass as a sustainable feedstock for bio-oil production,offering valuable insights into optimizing pyrolysis conditions to enhance bio-oil yield,thus advancing biofuel technology.

关键词： renewable energy biomass sustainable feedstock regression model fixed-bed reactor

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Healthcare waste management in selected government and private hospitals in Southeast Nigeria

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Asian Pacific Journal of Tropical Biomedicine 2016年第1期6卷 84-89页

作者： Angus Nnamdi Oli Callistus Chibuike Ekejindu David ufuoma Adje Ifeanyi Ezeobi Obiora Shedrack Ejiofor Christian Chibuzo Ibeh Chika Flourence Ubajaka Department of Pharmaceutical Microbiology and Biotechnology Faculty of Pharmaceutical Sciences Nnamdi Azikiwe University Agulu Campus Department of Clinical Pharmacy and Pharmacy Administration Faculty of Pharmacy Delta State University Department of Surgery Anambra State University Teaching Hospital Department of Pediatrics Anambra State University Teaching Hospital Department of Community Medicine College of Health Sciences Nnamdi Azikiwe University Nnewi Campus

Objective:To assess healthcare workers' involvement in healthcare waste management in public and private ***:Validated questionnaires(n = 660) were administered to randomly selected healthcare workers from selected private hospitals between April and July ***:Among the healthcare workers that participated in the study,187(28.33%) were medical doctors,44(6.67%) were pharmacists,77(11.67%) were medical laboratory scientist,35(5.30%) were waste handlers and 317(48.03%) were ***,the number of workers that have heard about healthcare waste disposal system was above average 424(69.5%).More health-workers in the government(81.5%) than in private(57.3%) hospitals were aware of healthcare waste disposal system and more in government hospitals attended training on *** level of waste generated by the two hospitals differed significantly(P=0.0086) with the generation level higher in government than private *** materials for healthcare waste disposal were significantly more available(P=0.001) in government than private *** was no significant difference(P = 0.285) in syringes and needles disposal practices in the two hospitals and they were exposed to equal risks(P =0.8510).Fifty-six(18.5%) and 140(45.5%) of the study participants in private and government hospitals respectively were aware of the existence of healthcare waste management committee with 134(44.4%) and 19(6.2%) workers confirming that it did not exist in their *** existence of the committee was very low in the private ***:The availability of material for waste segregation at point of generation,compliance of healthcare workers to healthcare waste management guidelines and the existence of infection control committee in both hospitals is generally low and unsatisfactory.

关键词： Healthcare waste Waste disposal system Government Private hospitals South-east Nigeria

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An angle-insensitive electromagnetic absorber enabling a wideband absorption

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Journal of Materials Science & Technology 2022年第18期113卷 33-39页

作者： Zhichao Lou Qiuyi Wang Xiaodi Zhou ufuoma I.Kara Rajdeep S.Mamtani Hualiang Lv Meng Zhang Zhihong Yang Yanjun Li Chenxuan Wang Solomon Adera Xiaoguang Wang Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China Willian G.Lowrie Department of Chemical and Biomolecular Engineering The Ohio State UniversityColumbusOH43210United States of America Institute of Materials Research and Engineering Agency for SciencesTechnology and ResearchSingapore State Key Laboratory of Medical Molecular Biology Institute of Basic Medical Sciences Chinese Academy of Medical SciencesSchool of Basic Medicine Peking Union Medical CollegeBeijing 100005China Department of Mechanical Engineering University of MichiganAnn ArborMI48109United States of America Sustainability Institute The Ohio State UniversityColumbusOH43210United States of America School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China

Electromagnetic(EM)wave absorbers with wideband absorption capability are proposed as a strategy to mitigate environmental pollution by EM ***,designing an EM absorber with its performance capacity independent of the EM wave incident angle remains elusive to *** this challenge requires development of EM absorbers whose EM absorption performance is insensitive to the EM wave incident ***,we synthesized EM absorbers with a variety of structures with different symme-tries(including micro-/nanospheres,nanoflakes and nanotubes)to study the effect of the EM absorbers’structure and the EM wave incident angle on the EM absorption *** analysis reveals that non-magnetic EM absorbers with spatially symmetric nanostructures exhibit excellent EM wave incident ***,we demonstrate that a class of non-magnetic EM absorbers made from bam-boo derived-carbon nanospheres exhibit EM incident angle-insensitivity and wideband EM absorption performance with an effective absorption band up to 3.5 GHz when the thickness is 1.4 mm,a signif-icant improvement from prior studies which used thicknesses as high as 3-4 mm for comparable EM absorption performance.

关键词： Nanostructure Angle-insensitive EM absorption Biomass derived carbon Wideband

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Implementing TB Surveillance in Nigeria: Best Practices, Challenges and Lessons Learnt

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Journal of Tuberculosis Research 2020年第4期8卷 199-208页

作者： Oluremilekun Comfort Kusimo Chukwuebuka Immanuel Ugwu ufuoma Aduh Chika Augustus Okoro World Health Organization Lagos Nigeria

Introduction: TB Surveillance is a critical component of the global TB response. Comprehensive, accurate and timely information on TB is crucial for an effective TB control program hence the need for a robust tuberculosis surveillance system in all countries that contribute to the global burden of TB including Nigeria. Against this backdrop, an intervention was set in motion to triangulate the information from the health data reporting systems towards improving the overall surveillance system for TB in the country. Objectives: This article highlights the best practices, lessons learnt and challenges associated with the implementation of TB surveillance in Nigeria. In resource-limited settings such as Nigeria where health systems including health information management are sub-optimal, there is a heavy reliance on national and sub-national TB surveillance systems. TB data is mainly reported through the National Tuberculosis Control, however the integrated disease surveillance and response (IDSR) system also provides a platform for TB data collation through the LGA and State disease surveillance and notification officers. Conclusion: Implementing TB surveillance in Nigeria brought to fore the need for a wider engagement of all health facilities in TB control. As a dividend of the TB surveillance intervention, quality of care was improved in the private health sector through effective linkages to the commodity management system of

关键词： Tuberculosis Surveillance IDSR Health Information TB Data

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