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Minimax Multivariate Control Chart Using a Polynomial Function

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Applied Mathematics 2011年第12期2卷 1539-1545页

作者： Johnson Ademola Adewara Kayode Samuel Adekeye Osebekwin ebenezer Asiribo Samuel Babatope Adejuyigbe 不详

Minimax control chart uses the joint probability distribution of the maximum and minimum standardized sample means to obtain the control limits for monitoring purpose. However, the derivation of the joint probability distribution needed to obtain the minimax control limits is complex. In this paper the multivariate normal distribution is integrated numerically using Simpson’s one third rule to obtain a non-linear polynomial (NLP) function. This NLP function is then substituted and solved numerically using Newton Raphson method to obtain the control limits for the minimax control chart. The approach helps to overcome the problem of obtaining the joint probability distribution needed for estimating the control limits of both the maximum and the minimum statistic for monitoring multivariate process.

关键词： Minimax Non-Linear Polynomial Process Maximum and Minimum

Process integration and economics evaluation of sugar beet pulp conversion into ethanol

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International Journal of Agricultural and Biological Engineering 2012年第2期5卷 52-61页

作者： ebenezer Donkoh John Degenstein Yun Ji Du Pont West Virginia 26101USA Department of Chemical Engineering Purdue UniversityWest LafayetteIndiana 47907USA Department of Chemical Engineering University of North DakotaGrand ForksNorth Dakota 58202USA

The aim of the study was to evaluate,from an economic standpoint,the feasibility of using sugar beet pulp(SBP)as the feedstock in an existing sugar processing plant to *** base cases were *** 1 incorporated dilute sulfuric acid pretreatment,enzymatic hydrolysis,and fermentation using *** 2 neglected the pretreatment step and used a series of enzymes in Simultaneous Saccharification and Fermentation(SSF)with *** yeast followed by *** K011 *** ethanol production cost for each case was estimated to be$1.50 and$1.10 per gallon of ethanol for case 1 and case 2,*** a 10%discount rate,a minimum selling price of$2.35 per gallon was obtained for case 1 and$1.53 per gallon for case *** prices can be competitive with the increasing gasoline ***,base case 2 has higher potential to be feasible with the discovery of efficient microbial species.

关键词： sugar beet pulp fuel conversion lignocellulosic biomass ethanol feasibility economics pretreatment enzymatic hydrolysis

Wastewater Quality Assessment of a Petroleum Refinery in Ghana

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Journal of Environmental Science and Engineering(B) 2013年第9期2卷 514-520页

作者： Frederick Kobina Nkrumah Mike Agbesi Acheampong ebenezer David Okwaning Ansa Jackson Adiyiah Department of Chemical Engineering Kumasi Polytechnic Kumasi 854 Ghana CSIR Water Research Institute Aehimota Accra Ghana Department of Field Operations Environmental Protection Agency Sunyani Ghana

TOR （Tema oil refinery） is the only petroleum refinery in Ghana. To assess the quality of the wastewater, wastewater samples taken from three points of discharge into the treatment plant and the treated effluent were analyzed for physico-chemical characteristics. The levels of the pH, temperature, conductivity, COD （Chemical Oxygen Demand）, TDS （Total Dissolved Solids）, TSS （Total Suspended Solids） and phenol were assessed from January to June, 2011. The results obtained indicate varied levels of contaminants in both the untreated and treated wastewater. The average values of the treated effluent parameters analyzed were 38 ℃, 6,258 μ***-1, 314 mg-L-1, 115 mg.L-1, 2,689 mg-L-1 and 1 mg.L-1 for the temperature, conductivity, COD, TDS, TSS and phenol, respectively. The results suggest that both the raw wastewater and the treated effluent did not meet the discharge limit set by Ghana Environmental Protection Agency. Therefore, the treated effluent required additional treatment before it can be discharged into the environment. This suggests that the wastewater treatment plant of TOR is ineffective for the type of wastewater produced.

关键词： Industrial wastewater petroleum effluent pollutants Tema oil refinery Ghana.

Analysis of Causes of Delay in Middle and High Income Self-Build Housing Projects (SBHPs) in Wa, Ghana

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Journal of Building Construction and Planning Research 2015年第4期3卷 171-179页

作者： Samuel Owusu Afram Anthony Bangdome-Dery Genevieve Ekua Eghan Titus ebenezer Kwofie Department of Architecture College of Architecture and Planning Kwame Nkrumah University of Science and Technology (KNUST) Kumasi Ghana Building Technology & Estate Management Department Wa Polytechnic Wa Ghana

Self-build housing projects (SBHPs) among middle and high income developers are faced with many challenges that cause delay in the delivery time of the house(s). The focus of this paper is to analyse the factors that cause delay in SBHPs in order to identify the critical delay factors. Review of literature and expert input revealed 20 variables which were used in a structured questionnaire for data collection from owners, consultants and builders in Wa Municipality. Reliability test, t-test analysis and mean ranking were used in the data analysis. The results revealed that “Delay in obtaining permit from Local Authorities” was the first delay factor followed by “Poor site management and supervision”. The delay factor ranked least was “Inadequate cost estimation and related details” from consultants. The paper recommends that Government agencies that regulate physical development should intensify public education, particularly on responsibilities and obligations, especially among self-builders. The paper recommends further study into labour-related issues as well as communication and information management among participants and its impact on self-build project success.

关键词： Delays Self-Build Housing Projects Ghana

A Simple Device to Evaluate the Influence Parameters of the Water Erosion of Bare Sandy-Clay Soils of the City of Douala

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Engineering（科研） 2019年第12期11卷 819-827页

作者： Timothée Thierry Odi Enyegue Didier Fokwa Eric Flavien Mbiakouo-Djomo ebenezer Njeugna Doctoral Unit of Engineering Sciences Laboratory of Mechanical Engineering ENSET University of Douala Douala Cameroon Department of Civil Engineering ENSET Douala University Douala Cameroon Department of Mechanical Engineering Douala University Douala Cameroon

We explore the parameters that influence the dynamics of water erosion. The method used is an experimental laboratory simulation, which consists of the quantitative evaluation of eroded masses as a function of slope, soil cohesion and rainfall intensity. A simulator was designed to have the ability to vary the slope of the terrain, as well as the rainfall intensity. The variation of the soil cohesion is obtained by compacting the soil under different pressures using a hydraulic press associated with the whole experimental device. The results obtained show that the device is a good tool to simulate in the laboratory the behavior of different soil under the action of rain;because these results are in agreement with existing models USLE, MUSLE and RUSLE [1] [2] [3] [4].

关键词： Water Erosion Mini-Rain Simulator Cohesion of a Soil Simulation Slope

Seroprevalence of Dengue Viral Infection among Adults Attending the University of Cape Coast Hospital

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Advances in Infectious Diseases 2021年第1期11卷 60-72页

作者： ebenezer Aniakwaa-Bonsu Daniel Amoako-Sakyi Kwabena Dankwa James Kojo Prah Samuel Victor Nuvor Department of Microbiology and Immunology School of Medical Sciences University of Cape Coast Cape Coast Ghana Directorate of University Health Services University of Cape Coast Cape Coast Ghana

Introduction: Most febrile illnesses in Ghana are often misdiagnosed and presumptively treated as malaria. This situation may be due to the inappropriate diagnostic tool, clinical oversight and lack of awareness of some of the disease conditions that might have been present in the country. This study sought to investigate the seroprevalence of dengue virus, geographical location of participants with circulating antibodies and finally evaluate the diagnostic accuracy of a Rapid diagnostic kit (RDT) using Enzyme Linked Immuno-Sorbent Assay (ELISA) as a gold standard for confirmation. Method: A hospital-based cross-sectional study was conducted among adults (≥18) attending the University of Cape Coast Hospital. From each participant, 3 - 4 ml of venous blood was drawn and serum was tested for IgG and IgM using RDT methods. Positive samples were selected for ELISA confirmation. Statistical analysis was performed using SPSS (v.20) and STATA (v.14) software. Results: A total of 270 participants were enrolled in the study. The geometric mean age was 32 years. Overall, Dengue virus (DENV) IgG seroprevalence by RDT was 10 (3.7%). Seroprevalence of IgG and IgM by the ELISA method was 34 (12.6%) and 6 (2.2%) respectively. Females recorded a high seroprevalence (7.4%) than males (5.2%) in terms of past exposure (IgG). On current exposure (IgM), females recorded a high seroprevalence (1.5%) than males (0.7%). Seroprevalence of individuals with dual positivity ((IgG + IgM+) (acute secondary infection) was 1.9%. Those with primary and recent infection (IgM+ only) were 0.4% whiles those with past and probably secondary infection (IgG+ only) were 10.7%. The odds of dengue exposure were significantly high among participants with ages 50 - 59 as compared to their other counterparts (AOR = 3.5, p = 0.03). Diagnostic accuracy of RDT kit was poor (Kappa value = 0.373 and 0.0001). Elmina was noted to record the highest seroprevalence valu

关键词： Seroprevalence ELISA RDT Dengue Virus

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健康科学的职业能力：从多元智能到临床实践

国外职业教育 2012年第2期 44-47页

作者： ebenezer Scrooge[美]

为一个特定的有教育意义的工作场所去探寻关键的才能，韦纳特提供下列有关标准：以独立的背景为主要的才能，这些能力在不同惯例、不同任务以及不同要求和条件下使用与效率上都是对等的。

关键词：职业能力临床实践多元智能科学健康工作场所教育意义才能

Harnessing Microalgae Biomass from Lake Taihu as a Natural Biocolorant Source for Sustainable Eco-Friendly Dyeing of Cotton with Ultrasonication

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Journal of Textile Science and Technology 2022年第2期8卷 107-121页

作者： Jakpa Wizi Lixiao Ni Cunhao Du Benjamin Kwablah Asinyo ebenezer Kofi Howard Charles Frimpong Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes MOE School of Environment Hohai University Nanjing China Department of Textiles Kwame Nkrumah university of Science and Technology Kumasi Ghana

Most water bodies worldwide are infested with algae bloom and Lake Taihu is no exception, various techniques have been developed to harvest microalgae from Lake Taihu as part of the lake cleaning program and this results in a large algae biomass to deal with. This study made use of the algae biomass harvested as a biocolorants source for textile application and also evaluated its dyeing characteristics with mercerized and bleached cotton. The fabrics were dyed with either ultrasound or water bath method. The ultrasound method improved dye extraction yield from 17.8% for the conventional method to 26.7%, which was also enhanced to 33.2% with the addition of HCl (1 cm). The ultrasound dyeing method was effective at improving dye uptake at a reduced dyeing temperature when compared to the conventional method and also produced different shades of color after dyeing with different mordants. The dyed fabrics had good fastness properties for laundry, crocking and light. The dyed fabrics also showed a good ultraviolet protection factor. The use of algae biomass as a potential source of colorants for textile application will provide an alternate dye source that is environmentally friendly.

关键词： Algae Biomass Ultrasound-assisted Dyeing Cotton Fabric Solvent Color Fastness

Evaluation of Laboratory Performance with Quality Indicators in Infectious Disease Hospital, Kano, Nigeria

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Open Journal of Clinical Diagnostics 2015年第1期5卷 1-9页

作者： Feyisayo ebenezer Jegede Henry Akwen Mbah Mansur Aminu Timothy Nathaniel Yakubu Kwasi Torpey Family Health International (FHI360) Abuja Nigeria Infectious Disease Hospital Laboratory Kano Nigeria

Background: In January 2010, the implementation of quality management systems toward WHO-AFRO laboratory accreditation commenced in the Antiretroviral Treatment Laboratory of the Infectious Disease Hospital, Kano, Nigeria. Quality improvement projects were instituted in 2011 in line with ISO 15189 requirements for accreditation of medical laboratory. In this study we evaluated the performance of the laboratory through some set of quality indicators (QI). Methodology: This was a retrospective study to evaluate laboratory QIs monitored from January 2011 to December 2013. The QIs were specimen rejection rate (SSR), turnaround time (TAT), proficiency testing performance (PTP) and client satisfaction survey (CSS). Data was collected into an excel file for analysis and percentage performance compared among years. SSR & TAT were evaluated with the Sigma scale. Results: A total of 7920 (2194 in 2011, 2715 in 2012, 3011 in 2013) specimens were received for testing. 22 (0.28%) specimens were rejected and 81 (1.02%) specimens’ results were reported after the acceptable TAT, giving a Sigma level of 4.27 and 3.82 for SSR and TAT respectively. There was steady improvement in PTP: CD4+ from 67% in 2011 to 90% in 2013, hematology from 81% in 2012 to 83% in 2013, blood film reading 79% in 2011 to 83% in 2013 and chemistry from 90% in 2011 to 93% in 2013. HIV serology recorded 100% throughout. CSS increased from 59% in 2012 to 78% in 2013. However, there was no statistically significance difference reported for PTP and CSS over the years (P > 0.05). Conclusion: The study highlights the need to continuously evaluate QIs and calls for more effort to improve on PTP and focuses on understanding and improving on clients concerns.

关键词： Evaluation Laboratory Quality Indicators Six Sigma Nigeria