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Advances in Materials Physics and Chemistry 2012年第4期2卷 232-238页

作者： Sylvester Lekoo Mammah Fidelix Ekeoma Opara Friday Barikpe Sigalo valentine benjamin omobo-pepple Fabian Ifeanyichukwu Ezema Sabastine Chukwuemeka Ezugwu Department of Physics and Astronomy University of Nigeria Nsukka Nigeria Department of Physics and Astronomy Western University Canada Department of Physics Faculty of Science Rivers State University of Science and Technology Port Harcourt Nigeria Department of Science Laboratory Technology School of Applied Sciences Rivers State Polytechnic Bori Nigeria

Thin films of Cobalt(II) Oxide were deposited from equimolar concentrations of Cobalt Chloride, and Hexamethylenetetramine on clean glass substrates using the Aqueous Chemical Growth method in order to determine the effect of precursor concentration on their optical and solid state properties. The analytical tools used for the study include, Rutherford Back Scattering (RBS) spectroscopy for elemental analysis and determination of film thickness, X-Ray Difftraction (XRD) for crystallographic structure, a UV-VIS spectrophotometer for optical and other solid state properties and a photomicroscope for photomicrographs. The results indicate that an increase in the concentration of precursor materials makes ACG CoO thin film a better absorber of ultraviolet radiation, a better transmitter of infra-red radiation, a reflector of visible radiation and a material having an increased band gap. The ACG CoO thin film deposited from 0.1 M precursor concentration was found to be a suitable material for the construction of thermographic devices, poultry houses etc. It can also serve as window layer in solar cells among other optoelectronic applications.

关键词： CoO Thin Film Aqueous Chemical Growth RBS XRD Optical Properties

Annealing effect on the optical and solid state properties of cupric oxide thin films deposited using the Aqueous Chemical Growth (ACG) method

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Natural Science 2013年第3期5卷 389-399页

作者： Sylvester Lekoo Mammah Fidelix Ekeoma Opara valentine benjamin Omubo-pepple Joseph Effiom-Edem Ntibi Sabastine Chukwuemeka Ezugwu Fabian Ifeanyichukwu Ezema Department of Physics and Astronomy Faculty of Science University of Nigeria Nsukka Nigeria Department of Physics and Astronomy Western University—Canada London Canada Department of Physics Faculty of Science Rivers State University of Science and Technology Port Harcourt Nigeria Department of Science Laboratory Technology School of Applied Sciences Rivers State Polytechnic Bori Nigeria Federal College of Education Obudu Nigeria

Thin films of CuO having an average thickness of 720 nm were deposited on clean glass substrates using the Aqueous Chemical Growth (ACG) method with Cu(NO3)2 and C6H12N4 as precursors and annealed at different temperatures in order to determine the effect of annealing temperature on their optical and solid state properties. The study was carried out using Rutherford Backscattering (RBS) spectroscopy for t thickness and chemical composition, X-Ray Diffraction (XRD) for crystallographic structure and a UV-VIS spectrophotometer for spectral analysis. The results indicate that the absorbance and absorption/extinction coefficient of the films vary inversely with annealing temperature while the transmittance, reflectance, direct band gap, real/imaginary dielectric constants and refractive index vary directly with annealing temperature. The results further indicate an improvement in crystallinity as annealing temperature increases. The as-deposited and annealed ACG CuO thin films were found to be suitable for use as window layer in solar cells among other electronic and optoelectronic applications.

关键词： Component Formatting Style Styling Insert

Modelling of Solar Power Production in Dry and Rainy Seasons Using Some Selected Meteorological Parameters

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Energy and Power Engineering 2022年第7期14卷 274-290页

作者： Nicholas N. Tasie Friday B. Sigalo valentine B. Omubo-pepple Chigozie Israel-Cookey Department of Physics Rivers State University Port Harcourt Nigeria

In this paper, we deployed the multiple linear regression method in developing a solar power output model for solar energy production, where the meteorological parameters are the independent variables. We fitted the model and found that the meteorological variables considered accounted for 94.88% and 99.61% of the power output in both dry and rainy seasons. We observed from the work that the solar panel performs well in all seasons but slightly better in the rainy seasons. This could be attributed to the washing away of dust particles from solar panels by the rain and higher operating temperature different from the specified manufactured temperature of 25°C. We observed that other factors such as the cloud slightly affect the optimal performance of the system. Panels inclined at an angle of 5° (Tilt) and facing south azimuth performs optimally, periodic washing of the surface of solar panels enhances optimal performance.

关键词： Solar Energy Solar Panel Meteorological Parameters Photovoltaic Cell Multiple Linear Regression

Design and Implementation of a Photovoltaic Data Acquisition System for Some Meteorological Variables

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Energy and Power Engineering 2022年第11期14卷 652-668页

作者： Nicholas N. Tasie Friday B. Sigalo valentine B. Omubo-pepple Chigozie Israel-Cookey Department of Physics Rivers State University Port Harcourt Nigeria

In this paper we have developed a data logging and monitoring system, we validated the system by comparing the result from it with the existing one and found that the system performs slightly better than the existing work in the same area. This implies that the data logger and monitoring system is good and can be used to monitor solar energy variables even at the comfort of our homes. We fitted a model to the generated data and found that the meteorological variables considered accounted for 99.88% of the power output in the rainy seasons while 0.12% of the variation was not explained due to other factors. Solar panels inclined at an angle of 5° (Tilt) and facing South Pole perform optimally.

关键词： Data Logging and Monitoring System Circuit Design Development Chip Programming and Software Development Photovoltaic Cell Meteorological Parameters

Media Ethics as Key to Sound Professionalism in Nigerian Journalism Practice

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Journalism and Mass Communication 2018年第2期8卷 56-67页

作者： Ibituru Iwowari pepple Ijeoma Jacquelyn Acholonu International Institute of Journalism Abuja Nigeria Imo State University Owerri Nigeria

This paper examines the implications of ethics as key to sound professionalism in Nigerian journalism. The paper sets out to assess how ethics affect the standard of journalism practice in the country, using media practitioners in Rivers State, Nigeria as case study. The population of study consisted of the 300 registered journalists in Rivers State of Nigeria, including the editors and managers. The survey research method was used while the questionnaire was used as the primary instrument for data gathering. It was revealed that despite the importance of ethics to journalism practice, journalists＇ adherences to the ethical codes were low. The study also revealed that journalists most times go against the ethics of the profession due to sycophancy, security reasons, desperation, greed, ethical dilemmas, and ignorance of the code of ethics. Based on the timings of the study, it was recommended that media establishments should liaise with the Nigerian Union of Journalist （NUJ） to ensure that only trained journalists are employed to work as journalists. Again the NUJ, it should institute standing disciplinary committee to discipline erring journalists both at the State and National levels. The Ethics Committee of the Nigeria Union of Journalists should regularly review the ethical conducts of journalists and encourage them to adhere to their code of practice

关键词： ethical codes media practitioners professionalism Social Responsibility Theory

Public Relations and Image Management Strategies of Nigeria Security&Civil Defence Corps After the Infamous “Oga at the Top” Incident

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Journalism and Mass Communication 2019年第2期9卷 84-99页

作者： Reginald Koko Nnamdi Tobechukwu Ekeanyanwu Ibituru I.pepple Department of English and Mass Communication Ignatius Ajuru University of EducationRivers StateNigeria Department of Communication Arts University of UyoAkwa Ibom StateNigeria Department of Journalism International Institute of JournalismAbujaNigeria

This paper evaluates the place of public relations in the image management strategies of the Nigeria Security and Civil Defence Corps (NSCDC) particularly after the infamous “Oga at the Top” interview by the Lagos State Commandant of the Corps. The paper uses questionnaire and the interview schedule as instruments to gather data from members of the public who are familiar with the “Oga at the Top” incident and the public relations officers (PROs) of the NSCDC respectively. From the data gathered, we conclude that the NSCDC adopted different image management strategies to salvage the corporate image of the Corps;that the image management strategies have engendered a cordial relationship between the media and the Corps;and that the infamous “Oga at the Top” incident brought some fame to the Corps as free advertisement as well as questioned the capacity of its officials to discharge their duties effectively. As a fallout of this evaluation, it is recommended that NSCDC management should endeavour to engage only professionals in the field of public relations who would understand and implement public relations objectives and functions in the organisation and that all ranking officers of the NSCDC should endeavour to involve the public relations unit in all their engagement with the external publics to avoid a repeat of the “Oga at the Top” incident that affected the Corps’ image negatively.

关键词： image management strategies “Oga at the Top” publics corporate image NSCDC public relations

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流行性出血热患者胃粘膜变化的观察

新乡医学院学报 1988年第2期 29-32页

作者：张小兆时全福确山县人民医院确山县人民医院

本文对42例流行性出血热(EHF)患者各期胃粘膜损害进行观察,表明EHF 出血性胃炎具有特征性:消化道症状越重,胃粘膜损害越重,多样损害交互重迭存在,病变部位以胃底胃体部较重,而胃窦部次之(P<0.05),重者可累及食道、贲门、十二指肠,直视... 详细信息

本文对42例流行性出血热(EHF)患者各期胃粘膜损害进行观察,表明EHF 出血性胃炎具有特征性:消化道症状越重,胃粘膜损害越重,多样损害交互重迭存在,病变部位以胃底胃体部较重,而胃窦部次之(P<0.05),重者可累及食道、贲门、十二指肠,直视图象与组织病理学改变与其他任何原因所致的胃粘膜损害迥然不同。讨论了 EHF 患者做胃镜检查安全性及临床应用价值。

关键词：流行性出血热纤维胃镜胃粘膜损害出血性胃炎