Effect of Ion exchange dialysis process variables on Aluminium permeation using Response surface methodology

Dennis Asante-Sackey,Sudesh Rathilal,V.L Pillay,Emmanuel Kweinor Tetteh 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.5

This study investigated aluminum permeation using a counter flow ion exchange dialysis (IED) system. The optimum conditions for permeation were investigated using response surface methodology (RSM). Effect of four factors- feed concentration (100-2,000 ppm, A), feed flow rate (25-85%, B), sweep concentration (0.25-1 N HCl, C) and sweep flow rate (25-85%, D) were studied using face centered central composite (FC-CCD) statistical experimental design. A RSM model was developed based on the experimental permeation data and the response plot was developed. The FC-CCD model predicted permeation correlated with the experimental data. The regression coefficient (R²) was found to be 0.9568. The experiment showed the ascending order of the effect of the variables is D < B < C < A. In a counter flow IED for Al permeation, the sweep flow rate is insignificant (p > 0.05). Experimental validation demonstrated for target permeation of 70% was 68.8% ± 2.22%. This suggested that the RSM was a suitable tool in optimizing Al-permeation.

Global Leadership: An organization`s key to future sustainability

( Yaw Asante ) 한국행정학회 2012 한국행정학회 학술발표논문집 Vol.2012 No.-

Dynamics and trends in social trust in Ghana

Richard Asante 한국외국어대학교 국제지역연구센터 2014 International Area Studies Review Vol.17 No.1

The problem of lack of social trust (or interpersonal trust) in Africa remains a concern. This article describes and analyses why Ghana faces a challenge of low social trust in spite of the progress made in both political and economic development, especially in the past two decades. Building on the existing body of knowledge, which often points to either economic or non-economic factors as major determinants of social trust, the article argues that the problem of low levels of social trust is anchored to a hybrid of both economic and non-economic factors. The failure of the government to reduce socio-economic inequalities and unemployment along with lack of strong institutions to enforce contracts explains the deficit in social trust in Ghana. The article brings to the fore the importance of structural and historical factors, notably the legacies of the slave trade and colonial rule, and social exclusion as critical to understanding the problem of low social trust. It concludes by highlighting how Ghana could develop social trust among its citizens.

Farmers’ Perceptions and Preferences for Improved Varietal Traits in the Wenchi and Offinso North Municipalities of Ghana

Bright Owusu Asante,Jonas Osei-Adu,Kwasi Offei Bonsu,Michael Kwabena Osei,Richard Adabah,Stephen John Ayeh,John Okyere,Cho Gyoungrae,Jeon Hakyung,Hong Soonsung 한국국제농업개발학회 2020 韓國國際農業開發學會誌 Vol.32 No.2

This paper examined farmers’ perceptions and preferences for improved varietal traits in the Wenchi and Offinso North Municipalities of Ghana. Data from 306 randomly selected tomato farmers were analyzed using perception indices, Kendall’s Coefficient of concordance and the Poisson regression model. The results show that tomato farmers are willing to adopt an improved variety with long shelf life, good fruit quality and large fruit size. The study further indicates that tomato farmers lack requisite skills in pest and disease management. The number of varietal attributes preferred by farmers was positively influenced by sex of farmer, education, experience in tomato cultivation, household size, access to credit, FBO membership, extension contacts farm size and off-farm income. These factors and attributes need to be carefully considered by breeders and policy makers in the development of an improved tomato variety to enhance its uptake. The major constraints identified in tomato production include limited access to capital followed by low commodity prices coupled with low demand with the least constraint being access to tractors for land preparation. The potential of adoption of improved tomato varieties in Ghana will be augmented through paragenetic measures towards addressing these constraints.

Comparative Study of the Impact of Intoxication on Injuries in China and Korea

Lydia Sarponmaa Asante,Maxine Newell,윤미은,Sunmee Yun-Welch,천성수 질병관리본부 2015 Osong Public Health and Research Persptectives Vol.6 No.1

Objectives: Alcohol misuse has been widely studied as a substantial contributor to injured patients’ visits to emergency departments. The current research studied differences in alcohol-related injury variables in China and Korea. Methods: Data were collected from a sample of 4,509 patients (2,862 males and 1,667 females) reporting at emergency departments in China and Korea using the World Health Organization collaborative study on alcohol and injuries protocol. Results: More injuries were reported by men, young people aged 25-34 years, employed individuals, and persons who had at least a high-school education. The proportion of injury cases among intoxicated patients was 14% for Chinese and 20% for Koreans. The odds of intentional injuries to intoxicated patients increased significantly when the perpetrator had been drinking, especially for severely intoxicated victims in both countries. The odds of injuries for intoxicated persons in both countries were high during sports and leisure activities; odds ratio (OR) = 3.93, 95% confidence interval (CI) = 2.76-5.59 for Chinese and OR = 10.97, 95% CI = 6.06-19.85 for Koreans. Conclusion: These findings are a contribution to research in the two Asian countries about the effect of intoxication on injuries especially when both victim and perpetrator are intoxicated.

2SF-7 CFD Modeling of Atmospheric Detritiation System in a Packed Bed Reactor

( Daniel Owusu Asante ),조정호,김동선 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

The oxidation process of hydrogen isotopes, D2 and T2 has been a major focus of research due to the hazards they are associated with when leaked into a working area. Oxidation of these isotopes is considered as the first step to handle these gases. In this study, CFD simulation will be executed using the kinetics proposed by other studies. The operating condition such as temperature will be varied in the catalyst zone to investigate the effect on the oxidation process. A 3D geometry of a model reactor will be developed using ANYSYS Fluent and the results displayed for further explanation. From the results, amount of oxidized T2 at the outlet of the catalyst bed reduced with increasing temperature which can be verified with previous experiment conducted by other studies.

Assessment of Genetic Diversity for Grain Yield and Yield Component Traits in Some Genotypes of Rice (Oryza Sativa L.)

Maxwell Darko Asante,Kossi Lorimpo Adjah,Ebenezer Annan-Afful 한국작물학회 2019 Journal of crop science and biotechnology Vol.22 No.2

Even though there are abundant rice genetic resources, only a fraction is used in breeding programs leading to a narrow genetic base for improved varieties. Increasing the use of available rice germplasm could lead to the development of varieties that are superior in yield and other important agronomic traits. One hundred rice genotypes were used to estimate the genetic variability, heritability, clustering, trait association, and principal components for eight yield and yield-related traits. The experiment was conducted in a 10x10 lattice design in three replications under field conditions. The GCV ranged from 4.3% for panicle length to 17.9% for grain yield. Grain yield (GY) had the highest PCV (37.3%), while kernel length had the lowest PCV (7.0%). High heritabilities and moderate genetic advances were observed for days to flowering (DF), plant height (PH), kernel length (KL), and kernel length-to-width ratio (KLW). In general, the magnitudes of genotypic correlations were higher than phenotypic correlations. Grain yield showed a positive association with DF and PL at both genotypic and phenotypic levels, and with PH and KW at the genotypic level only. The genotypes clustered into three groups and the first three principal components explained about 70.3% of the total variation with KLW, KL, DF, and GY being the principal discriminatory characters. There was adequate genetic variability in the germplasm to support breeding for improved grain yield and indirect selection for high yield can be done in early generations using DF, PH, and PL.

Steady State Design for the Separation of Acetone-Chloroform Maximum Boiling Azeotrope Using Three Different Solvents

( Manish Pokhrel ),( Asante Daniel Owusu ),( Jungho Cho ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.4

We have designed an extractive distillation for separating maximum boiling azeotrope of acetone-chloroform system. PRO/II 9.4 was used to simulate the overall process. The VLE data adopted from Dortmund data bank was regressed to obtain a new set of binary interaction parameters. Three different entrainers were used for the separation process--dimethyl sulfoxide (DMSO), ethylene glycol (EG) and benzene--to test their viability for the acetone-chloroform system. Thermodynamic feasibility analysis was done through ternary map diagrams. Two different thermodynamic models, NRTL and UNIQUAC, were explored for the study of overall process.

Sino-Ghana bilateral relations and Chinese migrants’ illegal gold mining in Ghana

Emmanuel Debrah,Richard Asante 서울대학교행정대학원 2019 Asian Journal of Political Science Vol.27 No.3

This article examines the participation of some Chinese migrants in illegal gold mining (known as galamsey) in Ghana, and how the Government’s policy to address the issue created diplomatic tension between China and Ghana. Drawing on primary data from in-depth, face-to-face interviews with 250 respondents and supplementary information from archival sources and personal observation, the study found that small-scale gold mining is an area legally reserved for Ghanaian indigenes, who faced stern competition from some Chinese migrants’ miners. Their ability to mobilize resources and machinery to execute galamsey virtually displaced the indigenes from their source of livelihood and caused environmental catastrophes. The Ghana Government’s policy response to the Chinese migrants’ galamsey, which led to arrests, sentencing and deportations of some Chinese miners, angered Beijing and fractured Ghana–China diplomatic ties. But the dispute could not collapse the entrenched bilateral relations between the two nations because the calculated mutual benefit derived from the relations was thought to be higher than the Chinese galamsey issue. Policy reforms which legally integrate Chinese migrants’ miners into the small-scale mining sector would stop galamsey and strengthen Sino-Ghana relations.

침대 형태에서 기능성 직물 전도성 전극 위치에 대한 심전도 측정 방법의 Pilot Test

최준원,Lina A. Asante,송창현,정하림,김한성 대한의용생체공학회 2023 의공학회지 Vol.44 No.1

Electrodes are one of the types of biosensors capable of measuring bio signals, such as electrocardiogram (ECG) and electromyogram (EMG) signals. These electrodes are used in various fields and offer the advantage of being able to measure ECG signals without the need for skin attachment, compared to Ag/AgCl electrodes. The pur- pose of this study was to evaluate the efficacy of conductive textile electrodes in collecting ECG signals in a bed- like environment. Three adult participants were involved, and a total of 30 minutes of ECG signals were collected for each participant. The collected ECG signals were analyzed to determine the heart rate, normLF and a comparison was made between the conductive textile electrodes and Ag/AgCl electrodes. As a result, the change in heart rate and normLF could be observed, and in particular, the difference between the two electrodes decreased. This study confirmed that conductive textile electrodes can effectively collect ECG signals in a bed-like environment. It is hoped that this research will lead to the development of a system that can detect various sleep-related diseases through the use of these electrodes.