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Inhibition effect of 2-amino-5-ethyl-1,3,4-thiadiazole on corrosion behaviour of austenitic stainless steel type 304 in dilute HCl solution

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Journal of Central South University 2016年第2期23卷 258-268页

作者： Roland T.loto cleophas a.loto Abimbola P.Popoola Tatiana Fedotova Department of Mechanical Engineering Covenant UniversityOtaOgun StateNigeria Department of Chemical Metallurgical&Materials EngineeringTshwane University of TechnologyPretoriaSouth Africa

The corrosion inhibition of type 304 austenitic stainless steel by 2-amino-5-ethyl-1, 3, 4-thiadiazole(TTD) compound and the electrochemical behaviour in dilute HCl solution were investigated through potentiodynamic polarization test, mass loss techniques and potential measurements. The results show that the organic derivative is highly effective with a maximum inhibition efficiency of 70.22% from mass loss analysis, while 74.2% is obtained from polarization tests. Observation of the scanning electron micrographs shows the absence of corrosion products due to electrochemical influence of TTD on the surface morphology of the steel. X-ray diffractometry reveals the absence of phase compounds and complexes on the steel samples after exposure. TTD adsorption on the steel surface obeys the Langmuir, Frumkin and Freundlich adsorption isotherms. Corrosion thermodynamic calculations reveal the inhibition mechanism occurs through chemisorption process and results from statistical analysis depict the strong influence of inhibitor concentration on the electrochemical performance of the TTD.

关键词： thiadiazole adsorption corrosion stainless steel inhibitor HCI

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The Assessment of Non-Linear Effects in Clinical Research

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Pharmacology & Pharmacy 2012年第2期3卷 139-147页

作者： Ton J. cleophas Aeilko H. Zwinderman European College Pharmaceutical Medicine Lyon France c/o Albert Schweitzer Hospital Dordrecht Netherlands European College Pharmaceutical Medicine Lyon France c/o Albert Schweitzer Hospital Dordrecht Netherlands.

Background: Novel models for the assessment of non-linear data are being developed for the benefit of making better predictions from the data. Objective: To review traditional and modern models. Results, and Conclusions: 1) Logit and probit transformations are often successfully used to mimic a linear model. Logistic regression, Cox regression, Poisson regression, and Markow modeling are examples of logit transformation;2) Either the x- or y-axis or both of them can be logarithmically transformed. Also Box Cox transformation equations and ACE (alternating conditional expectations) or AVAS (additive and variance stabilization for regression) packages are simple empirical methods often successful for linearly remodeling of non-linear data;3) Data that are sinusoidal, can, generally, be successfully modeled using polynomial regression or Fourier analysis;4) For exponential patterns like plasma concentration time relationships exponential modeling with or without Laplace transformations is a possibility. Spline and Loess are computationally intensive modern methods, suitable for smoothing data patterns, if the data plot leaves you with no idea of the relationship between the y- and x-values. There are no statistical tests to assess the goodness of fit of these methods, but it is always better than that of traditional models.

关键词： Non-Linear Effects Clinical Research Logit/Probit Transformation Box Cox Transformation ACE/AVAS Packages Curvilinear Data Spline Modeling Loess Modeling

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清洁生产地区性观点:非洲地区

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产业与环境 1997年第3期19卷 48-51页

作者： cleophas L.C.Migiro

本文评述了几个非洲国家中与清洁生产有关的活动．意识产生、管理层承诺、态度改变和厂内示范，对于清洁生产概念在该地区的成功推广是至关重要的．联合国环境署非洲地区办事处（ROA）以及其它机构和组织需要日益活跃地为交流与清洁生... 详细信息

本文评述了几个非洲国家中与清洁生产有关的活动．意识产生、管理层承诺、态度改变和厂内示范，对于清洁生产概念在该地区的成功推广是至关重要的．联合国环境署非洲地区办事处（ROA）以及其它机构和组织需要日益活跃地为交流与清洁生产有关的观点和经验创造机会．

关键词：清洁生产非洲地区

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A Time to Event Analysis of Adverse Drug Reactions Due to Tenofovir, Zidovudine and Stavudine in a Cohort of Patients Receiving Antiretroviral Treatment at an Outpatient Clinic in Zimbabwe

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Pharmacology & Pharmacy 2015年第3期6卷 201-206页

作者： Tinashe Mudzviti Nyasha T. Mudzongo Samuel Gavi cleophas Chimbetete Charles C. Maponga Gene D. Morse School of Pharmacy University of Zimbabwe Harare Zimbabwe Newlands Clinic Harare Zimbabwe Department of Clinical Pharmacology College of Health Sciences Harare Zimbabwe Center of Excellence in Bioinformatics and Life Sciences and The School of Pharmacy and Pharmaceutical Sciences University at Buffalo SUNY Buffalo NY USA

Background: Achieving the long terms goals of antiretroviral treatment (ART) requires a careful approach during treatment initiation that takes into account patient’s psychosocial state, availability and accessibility of treatment combinations, and adherence support. Adverse drug reactions that occur during the initial phases have a bearing on treatment outcomes and thus need to be monitored and treated. Objective: This study was done to assess length of time (survival time) it took for clinically significant adverse drug reactions to occur in patients taking Nucleoside Reverse Transcriptase Inhibitors (N(t)RTI) available for treatment of Human Immunodeficiency Virus (HIV) infection in Zimbabwe. Methods: A retrospective cohort of patient data collected from January 2009 to December 2012 was extracted from an Electronic Health Record database. Data from patients who were initiated on antiretroviral (ARV) drug regimens containing N(t)RTI drugs were analysed for survival time. A sample of 205 patient files was extracted for the time period for survival analysis using adverse drug reactions due to N(t)RTI drugs. Results: After data extraction, a total of 205 patient records were used in determining the time to event analysis of ADR’s in the cohort. The age range for the patients included in the study was 9 - 76 with a mean of 41 years (s.d = 14.8). Patients initiated on stavudine had a lower survival time before a clinically significant ADR compared to tenofovir (-365 days, p-value < 0.0005). Patients on zidovudine also had a less time before a significant reaction compared to those on tenofovir (-230 days;p-value = 0.008). Patients on zidovudine fared better compared to those on stavudine (-134 days;p-value < 0.0005). The mean survival time was highest for tenofovir (618 days), followed by zidovudine (388 days), and then stavudine (254 days).Conclusion: Patients on tenofovir have a longer survival time before a clinically significant adverse reaction. Treatment program

关键词： Survival Analysis Electronic Medical Records Adverse Drug Reactions

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酶在家禽营养中的重要作用

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国外畜牧学（饲料） 1996年第2期 21-23页

作者：黄炎坤 G.M.L.cleophas

在动物的消化追酶可以促进饲料的消化。饲料中的淀粉、蛋白质和脂类,都容易被动物自身的消化系统分解。然而,许多其它成分,如植物细胞壁中的多聚糖,仅能部分地被单胃动物,如猪和禽所消化。反刍动物可惜助其瘤胃中的微生物发酵分解这些... 详细信息

在动物的消化追酶可以促进饲料的消化。饲料中的淀粉、蛋白质和脂类,都容易被动物自身的消化系统分解。然而,许多其它成分,如植物细胞壁中的多聚糖,仅能部分地被单胃动物,如猪和禽所消化。反刍动物可惜助其瘤胃中的微生物发酵分解这些细胞壁多聚糖,而单胃动物对这些多聚糖的发酵仅局限于大肠,因此发酵很少。

关键词：家禽营养酶饲料

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