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Impacts of Fines at Morupule Coal Mine, Botswana 博茨瓦纳Morupule煤矿的罚款影响
IF 0.3 Q4 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-05-21 DOI: 10.4314/mejs.v15i1.1
O. Saubi, Raymond S Suglo, B. Konka
Morupule Coal Mine (MCM) classifies fines as coal particles that are less than 3.35 mm in size. Fines are one of the problems MCM is facing and have occasionally led to penalties from some customers. This paper quantifies the fines generated in MCM from the working face to the run-of-mine stockpile and its economic and environmental impacts. Data about the wash plant's production losses were collected through an examination of missed deadlines, stoppages due to tail-end blockages, and conveyor belt breakdowns using company reports. Data on coal dust concentrations were obtained from the mine. It was found that the overall haulage system generates about 27% of the fines of the coal produced monthly. The total monetary loss per shift from production and the wash plant is BWP 418,285. Coal dust concentration underground is kept within acceptable limits due to strict engineering control measures while it exceeds the required levels on the surface and is difficult to control as it is exposed to the atmosphere. As a result, the vegetation around the mining concession is affected by coal dust.   Fine generation; Dust production; Coal degeneration; Economic impact; environmental impact.
Morupule Coal Mine (MCM)将细粒煤分类为小于3.35 mm的煤颗粒。罚款是MCM面临的问题之一,偶尔会导致一些客户的罚款。本文量化了从工作面到回采储存库中MCM产生的细粒及其对经济和环境的影响。通过检查错过的最后期限、由于尾端堵塞而停工以及使用公司报告的传送带故障,收集了有关洗涤厂生产损失的数据。煤尘浓度的数据是从该矿获得的。研究发现,整个运输系统产生的煤粉约占月产量的27%。生产厂和洗涤厂每班的总经济损失为418,285英镑。地下煤尘浓度由于严格的工程控制措施而保持在可接受的范围内,而地表煤尘浓度超过规定水平,并且暴露在大气中难以控制。因此,矿区周围的植被受到煤尘的影响。细一代;粉尘生产;煤炭变性;经济影响;环境的影响。
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引用次数: 1
Psychological Characteristics of Professional Soccer Players and their Comparison with Amateur Players 职业足球运动员的心理特征及其与业余足球运动员的比较
IF 0.3 Q4 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-05-21 DOI: 10.4314/mejs.v15i1.8
M. Sultanov
The purpose of this study was to test the association between personality traits and competitive anxiety among professional soccer players and amateur soccer players (n=78), whose ages ranged from 17 to 21 years.  Personality traits were defined using the Eysenck Personality Questionnaire (translated and adapted version). Participants completed the Sport Competition Anxiety Test by Martens to assess their state of anxiety. The study revealed the dominance of sanguine and choleric temperament, corresponding to extraversion in the representatives of both groups. A one-way ANOVA demonstrated a statistically significant difference (p ≤ 0.03) between the competitive anxieties of the two groups. The results of the stepwise linear regression analysis demonstrated a statistically significant relationship (p ≤ 0.0001) between competitive anxiety and both psychoticism and neuroticism among professional soccer players. According to the results, psychoticism and neuroticism predict the formation of competitive anxiety in professional soccer players. In soccer, the level of competition causes personality differences by psychoticism and neuroticism, however, extraversion is the factor of pre-existing differences, which draw any players into a team sport. Coaches should spend more time on competitive games among youth players because it can help to adapt the autonomic nervous system and reduce excessive levels of anxiety.
本研究的目的是测试年龄在17-21岁之间的职业足球运动员和业余足球运动员(n=78)的人格特征与竞争焦虑之间的关系。使用艾森克人格问卷(翻译和改编版)对人格特征进行定义。参与者完成了马滕斯的体育比赛焦虑测试,以评估他们的焦虑状态。这项研究揭示了多血和胆汁性气质的主导地位,对应于两组代表的外向性。单因素方差分析显示,两组的竞争焦虑之间存在统计学显著差异(p≤0.03)。逐步线性回归分析的结果表明,职业足球运动员的竞争焦虑与精神质和神经质之间存在统计学显著关系(p≤0.0001)。结果表明,精神质和神经质可预测职业足球运动员竞争焦虑的形成。在足球比赛中,比赛水平通过精神质和神经质导致性格差异,然而,外向性是预先存在的差异的因素,这会吸引任何球员参加团队运动。教练应该花更多的时间在青少年球员的竞技比赛上,因为这有助于适应自主神经系统,减少过度的焦虑。
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引用次数: 0
Implication of Mathematical tools to Teachers’ Method of Teaching High School Mathematics: The case of Mekelle Zone, Tigray, Ethiopia 数学工具对中学数学教师教学方法的启示——以埃塞俄比亚提格雷Mekelle地区为例
IF 0.3 Q4 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-05-21 DOI: 10.4314/mejs.v15i1.6
Tsegay Tesfay, Abreha Tesfay, Tsge Bayrau
Education with science and mathematics as its major components determines the level of welfare of people and a nation. Nowadays, great attention is given to technological advancements and mathematics education. Hence, this paper explicitly discusses the use of mathematics laboratories and their implication for teaching mathematics, finding out the practices and impact on teaching mathematics and teachers’ frequency of using teaching aids (manipulatives) in high schools of Mekelle zone. Manipulatives are valuable aid to teachers that can be used by analyzing students’ concrete representations of mathematical concepts. In addition to this, topics like geometry and measurement are topics that are frequently taught using tools. On the contrary, solving equations, relations, and functions is rarely taught using these manipulatives. This study indicates that there is no direct correlation between teachers’ teaching experience years and the use of manipulatives in their classrooms. It is, therefore, recommended that mathematics teachers should get training and workshops on the use of teaching aids (manipulatives), useful software like (geogebra, sketchpad, and other timely used technologies) and other methods of teaching mathematics in mathematics laboratories.  
以科学和数学为主要组成部分的教育决定着人民和国家的福利水平。如今,人们对技术进步和数学教育给予了极大的关注。因此,本文明确讨论了数学实验室的使用及其对数学教学的意义,了解了Mekelle地区高中数学教学的实践和影响,以及教师使用教具(操纵器)的频率。操纵对教师来说是很有价值的帮助,可以用来分析学生对数学概念的具体表现。除此之外,几何和测量等主题也是经常使用工具教授的主题。相反,很少使用这些操作来教授求解方程、关系和函数。这项研究表明,教师的教学经验年限与课堂上操纵器的使用之间没有直接的相关性。因此,建议数学教师在数学实验室接受关于使用教具(操纵器)、有用软件(geogebra、画板和其他及时使用的技术)和其他数学教学方法的培训和研讨会。
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引用次数: 0
The Effect of Anethum Graveolens on Male Fertility: Systematic Review and Meta-Analysis 菊花对男性生育能力的影响:系统回顾和荟萃分析
IF 0.3 Q4 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-05-21 DOI: 10.4314/mejs.v15i1.5
Seid Mohammed, Birhane Alem Berihu, T. Beyene
  The literature survey has reported that Anethum graveolens extract is inescapably linked with fertility. Recent studies showed that the aqueous extract of Anethum graveolens extract has an adverse effect on male fertility by affecting serum testosterone level, sperm concentration as well as sperm motility. However, its evidence has not been established. The present paper tries to determine the level of evidence for the effect of dill (Anethum graveolens) on male fertility. MEDLINE, Cochrane Library, PubMed, Academic Search Complete, SPORT Discus, Science Direct, Scopus, Web of Science, and Google Scholar were searched to retrieve the literature used for this review. Keywords utilized across the database search were dill, Anethum graveolens, mice, male fertility, randomized control trial, and experimental. The search was limited to studies in animals; published in the English language. Meta-analysis was conducted to examine the effect of Anethum graveolens (dill) extract administration on male fertility. The overall methodological quality of evidence was assessed using the Pedro scale. Out of 25 studies, four trials met the inclusion criteria for this review. All the studies were included in the meta-analysis. Of these, four studies were included for the analysis of sperm concentration, three studies for sperm motility, and two studies for serum testosterone hormone levels. The meta-analysis results suggested there were no significant differences between male fertility and other interventions in the effects of inducing male infertility. The number of studies regarding the current topic is scarce. The overall quality of evidence was very low. Therefore, it is difficult to conclude whether the aqueous extract of dill seed has or has no adverse effect on male fertility. Considering our meta-analysis, we recommended that there is a need for further investigation to provide adequate evidence for the effect of dill (Anethum graveolens) on male fertility.
文献调查报告称,阿那木提取物不可避免地与生育能力有关。最近的研究表明,沙蚕提取物的水提取物通过影响血清睾酮水平、精子浓度和精子活力,对男性生育能力有不利影响。然而,其证据尚未确定。本文试图确定dill(Anethum graveolens)对男性生育能力影响的证据水平。检索MEDLINE、Cochrane Library、PubMed、Academic Search Complete、SPORT Discus、Science Direct、Scopus、Web of Science和Google Scholar以检索本综述中使用的文献。数据库搜索中使用的关键词是dill、Anethum graveolens、小鼠、雄性生育能力、随机对照试验和实验。搜索仅限于对动物的研究;以英文出版。进行荟萃分析,以检验茴香提取物对男性生育能力的影响。使用Pedro量表评估了证据的总体方法质量。在25项研究中,有4项试验符合本综述的纳入标准。所有研究均纳入荟萃分析。其中,四项研究用于分析精子浓度,三项研究用于精子活力,两项研究用于血清睾酮水平。荟萃分析结果表明,男性生育能力和其他干预措施在诱导男性不孕的效果方面没有显著差异。关于当前主题的研究数量很少。证据的总体质量很低。因此,很难得出dill种子的水提取物是否对雄性生殖能力有不利影响的结论。考虑到我们的荟萃分析,我们建议有必要进行进一步的调查,为dill(Anethum graveolens)对男性生育能力的影响提供充分的证据。
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引用次数: 0
Willingness to Pay for Community-based Health Insurance and its Correlates among Households in Wukro and Setit-humera Towns, northern Ethiopia: A Cross-sectional Study 埃塞俄比亚北部Wukro和seit -humera城镇家庭支付社区医疗保险的意愿及其相关性:一项横断面研究
IF 0.3 Q4 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-05-21 DOI: 10.4314/mejs.v15i1.4
Goitom Gigar, Gebremedhin Berhe Gebregergs, Estifanos Gebremeskel, Atakilti Abrha, Berihu Mesfin
The study aimed to assess willingness to pay for community-based health insurance and its correlates among households in Wukro and Setit-humera towns, Tigray, Northern Ethiopia for the year 2016. A community-based survey was conducted in Wukro and Setit-humera towns of the Tigray region from August 30 to October 05, 2016. A total of 823 households were enrolled using a two-stage sampling. A structured, pre-tested, and interviewer-administered questionnaire was used.  Data were entered and analyzed using SPSS version 20. Frequencies, mean, and median were calculated. Bivariate and multiple variable logistic regressions were fitted. Odds Ratio with 95% CI was used to see the associations between selected independent variables and the outcome variable. Willingness to pay for community-based health insurance (CBHI) in the two towns was 93.4% with a 95% CI (91.6-95.0). The median amount of money that households are willingness-to-pay (WTP) was 11.1 USD. The mean amount of money an individual household is willing to pay was significantly higher in Setit-humera than in Wukro town. Participants who knew their monthly income were two times more likely to be willing to pay for CBHI [Adjusted odds ratio (AOR) =2.6, 95% CI; 1.1, 8.1]; and willingness was higher among households who perceived that the cost of care is affordable in health facilities [AOR=2.6, 95% CI; 1.02, 7.1]. The study has shown a high level of willingness to pay for health insurance. Perceived affordability and knowledge of monthly income were significant factors that affect willingness to pay for community-based health insurance. Therefore, it can be operationalized in urban settings provided that the community is aware and sensitized focusing on the benefits of health insurance. Besides, the premium needs to be carefully set to consider the community’s ability to pay.
该研究旨在评估2016年埃塞俄比亚北部提格雷的Wukro和seit -humera镇家庭支付社区医疗保险的意愿及其相关因素。2016年8月30日至10月5日,在提格雷地区的Wukro和seit -humera镇开展了一项基于社区的调查。采用两阶段抽样法,共纳入823户家庭。使用了结构化的、预先测试的、由访谈者管理的问卷。数据输入和分析使用SPSS版本20。计算频率、平均值和中位数。拟合了双变量和多变量logistic回归。使用95% CI的比值比来观察所选自变量与结果变量之间的关联。两个城镇的社区医疗保险(chi)支付意愿为93.4%,95% CI(91.6 ~ 95.0)。家庭愿意支付的中位数为11.1美元。seit -humera的家庭平均愿意支付的金额明显高于wuukro镇。知道自己月收入的参与者愿意为CBHI支付费用的可能性高出两倍[调整优势比(AOR) =2.6, 95% CI;1.1、8.1);认为医疗机构的医疗费用负担得起的家庭的意愿更高[AOR=2.6, 95% CI;1.02、7.1)。这项研究表明,人们非常愿意为医疗保险买单。感知负担能力和对月收入的了解是影响社区医疗保险支付意愿的重要因素。因此,只要社区了解并敏感地关注健康保险的好处,就可以在城市环境中实施。此外,保费需要仔细设定,以考虑社区的支付能力。
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引用次数: 0
Synthesis, Physicochemical, and Antimicrobial Activity of Copper and Zinc Complexes with N, O - Bidentate Schiff Base N, O -双齿希夫碱铜锌配合物的合成、理化及抗菌活性研究
IF 0.3 Q4 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-05-21 DOI: 10.4314/mejs.v15i1.3
Elias Assayehegn, Abraha Tadese, Goitom G/Yohannes, S. Alemayehu, Tesfamariam Teklu
This paper is intended to prepare new antimicrobial complexes with proven efficiency. The Schiff base, through the condensation process of salicylaldehyde and p-toludine, and its Cu and Zn complexes were successfully synthesized. The Schiff base and its complexes were characterized using molar conductivity, Ultraviolet-visible (UV-Vis), atomic absorption spectroscopy (AAS), and Fourier transform infrared (FTIR) techniques. Accordingly, these characterizations not only confirmed that the synthesized Schiff base acted as N,O bidentate ligand (through azomethine nitrogen and phenoxide oxygen) and chelated with Cu(II) and Zn(II) in the metal-to-ligand ratio of 1:2 but also revealed the characteristic electronic-transition of π→π*/n→π* of the ligand, and ligand-metal charge transfer and d-d of the metal complexes. Moreover, both Cu and Zn complexes recorded weak molar conductance of 54.12 and 51.41 S cm2 mol-1, respectively. Further, their antibacterial activities were evaluated by disc diffusion assay against Staphylococcus aureus (gram-positive), Escherichia coli (gram-negative), and Bacillus cereus (gram-negative) bacteria. For all microbial, the metal complexes recorded higher activities than the parent ligand; such increased activity of the complexes may be due to the chelation of the metal ion in the complexes, which enhances the lipophylic character favoring its permeation through the lipid layer of the cell membrane. Such metal complexes can therefore be explored in the future as an option for decreasing the pathogenic potential of infecting bacteria.
本文旨在制备新的高效抗菌配合物。通过水杨醛与对甲苯胺的缩合反应,成功地合成了席夫碱及其Cu、Zn配合物。采用摩尔电导率、紫外-可见(UV-Vis)、原子吸收光谱(AAS)和傅里叶变换红外(FTIR)技术对希夫碱及其配合物进行了表征。因此,这些表征不仅证实了合成的席夫碱作为N,O双齿配体(通过亚甲基氮和苯氧氧),并与Cu(II)和Zn(II)以1:2的金属配体比螯合,还揭示了配体π→π*/ N→π*的电子跃迁特征,以及配体-金属电荷转移和金属配合物的d-d转移特征。此外,Cu和Zn配合物的摩尔电导分别为54.12和51.41 S cm2 mol-1。此外,通过圆盘扩散试验对金黄色葡萄球菌(革兰氏阳性)、大肠杆菌(革兰氏阴性)和蜡样芽孢杆菌(革兰氏阴性)的抑菌活性进行了评价。对所有微生物而言,金属配合物的活性均高于母体配体;配合物活性的增加可能是由于配合物中的金属离子的螯合作用,这增强了其脂性,有利于其通过细胞膜的脂质层渗透。因此,未来可以探索这种金属配合物,作为降低感染细菌致病潜力的一种选择。
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引用次数: 0
Estimation of growth parameters of the Atlantic chub mackerel (Scomber colias Gmelin, 1789) off Gallipoli Peninsula (Northern Aegean Sea, Turkey) 加利波利半岛(土耳其爱琴海北部)外大西洋鲐鱼生长参数的估计(Scomber colias Gmelin, 1789)
IF 0.3 Q4 MULTIDISCIPLINARY SCIENCES Pub Date : 2022-12-26 DOI: 10.4314/mejs.v14i2.1
Ö. Cengiz
This study was carried out to reveal the age and growth of the atlantic chub mackerel (Scomber colias Gmelin, 1789) in Gallipoli Peninsula (northern Aegean Sea, Turkey). The individuals of sampled S. colias from commercial fishmongers randomly each month were taken during the period January 2016-December 2016. A total of 348 otoliths were aged successfully. The total length and weight of aged specimens ranged from 16.0 to 28.0 cm and from 31.72 to 222.68 g, with a mean of 22.0 cm and 101.23 g, respectively. The length-weight relationship was estimated as W = 0.0060TL3.20 (R2 = 0.97). The von Bertalanffy growth equations were computed to be 𝐿∞ = 32.0 cm, k = 0.30 year-1, 𝑡0 = -1.72 year for all samples. The growth performance index (𝛷′) was found as 2.49. The present study provides the first information on the growth parameters of the species so as to define the current state Scomber colias population for Gallipoli Peninsula (northern Aegean Sea, Turkey).
本研究旨在揭示加利波利半岛(土耳其爱琴海北部)大西洋鲐鱼(Scomber colias Gmelin, 1789)的年龄和生长情况。于2016年1月至2016年12月期间,每月在商业鱼贩中随机取样大肠弧菌个体。共有348块耳石被成功老化。年龄标本的总长度为16.0 ~ 28.0 cm,总重量为31.72 ~ 222.68 g,平均长度为22.0 cm,总重量为101.23 g。长度-权重关系估计为W = 0.0060TL3.20 (R2 = 0.97)。所有样本的von Bertalanffy生长方程为𝐿∞= 32.0 cm, k = 0.30 year-1,𝑡0 = -1.72 year。生长性能指数( ')为2.49。本研究首次提供了关于该物种生长参数的信息,从而确定了加利波利半岛(土耳其爱琴海北部)的当前状态Scomber colias种群。
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引用次数: 0
Four and Five Figures of Kifilideen (Power of Base 11) and Antikifilideen (Antipower of Base 11) Tables as a Tool For Mathematics Computation 作为数学计算工具的Kifilideen(基数11的幂)和Antikifilideen表的四位数和五位数
IF 0.3 Q4 MULTIDISCIPLINARY SCIENCES Pub Date : 2022-12-26 DOI: 10.4314/mejs.v14i2.6
Osanyinpeju Kifilideen L
The four-figure of power of base numbers of tables needs to be created for easy synchronization with the existing Logarithm table of power of base 10 which is working on four figures. Although the five-figure of power base numbers of tables are more accurate because it is having less approximation in its establishment. The four-figure table is easy to compute doing utilization because it is having less digits to work with. This paper presents the four and five figures of Kifilideen (Power of base 11) and AntiKifilideen (Antipower of base 11) tables for the computation of mathematical problems. The four and five figures are both reliable to work with. However, there is a tradeoff between easy computation as related to the four-figure table and more accuracy as related to the five-figure table in their utilization.    
需要创建表的基数的四位数幂,以便与现有的以10为基数的对数表进行同步,该对数表正在处理四位数。虽然五位数的权基数表由于在编制时没有多少近似值而更为准确。四位数表的利用率很容易计算,因为要处理的数字较少。本文给出了计算数学问题的Kifilideen(以11为底的幂)表和AntiKifilideen(以11为底的反幂)表的四位数和五位数。四位数和五位数都是可靠的。但是,在使用四位数表时,需要在易于计算和五位数表的准确性之间进行权衡。
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引用次数: 0
A Comparison of the Semi Analytical and Numerical Method in Solving the Problem of Magnetohydrodynamics Flow of a Third Grade Fluid between Two Parallel Plates 求解两平行板间三级流体磁流体力学流动问题的半解析法与数值法的比较
IF 0.3 Q4 MULTIDISCIPLINARY SCIENCES Pub Date : 2022-12-26 DOI: 10.4314/mejs.v14i2.4
Lawal O. W, Erinle-Ibrahim L. M, Okunoye O. S
The main purpose of this study is to compare a semi-analytical method and numerical method namely the homotopy perturbation method (HPM) and finite difference method (FDM) respectively. These methods were employed for solving the nonlinear problem of the magnetohydrodynamic (MHD) couette flow of third-grade fluid between the two parallel plates. The comparison was made between a solution of HPM and FDM against a solution obtained from regular perturbation and the results are tabulated. From a computational viewpoint, it is revealed that the HPM is more reliable and efficient than FDM. Also, the results show that the FDM requires slightly more computational effort than the HPM, although the HPM yields more accurate results than the FDM.  
本研究的主要目的是比较半解析方法和数值方法,即同伦摄动法(HPM)和有限差分法(FDM)。这些方法用于求解两平行板间三级流体的磁流体动力学(MHD)库埃特流动的非线性问题。将HPM和FDM的解与常规扰动的解进行了比较,并将结果制成表格。从计算的角度来看,HPM比FDM更可靠和有效。此外,结果表明,FDM比HPM需要更多的计算量,尽管HPM比FDM产生更准确的结果。
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引用次数: 0
Analysis of Risk Factors in Fishing Activities in Lake Erçek (Van, Turkey) for Occupational Health and Safety 埃尔帕雷切克湖(土耳其范)渔业活动的职业健康与安全风险因素分析
IF 0.3 Q4 MULTIDISCIPLINARY SCIENCES Pub Date : 2022-12-26 DOI: 10.4314/mejs.v14i2.3
Ö. Cengiz
Fishing activities have always been a dangerous profession and numerous factors have a direct or indirect impact on the health, safety, and working conditions of fishermen. The present study aims in order to reveal the risk factors affecting the occupational health and safety of small-scale fishermen in Lake Erçek (Van, Turkey). Data were obtained from fishermen by survey between March 2022 and May 2022 and evaluated using the” L type matrix” method. “Having no training in occupational health and safety (OHS)” and “Fatigue from irregular and long working hours” are the important risk factors that affect the working conditions of fishermen. This study will make a significant contribution to the work efficiency of the fishermen and the planning to be made in the following processes, by making a risk analysis in terms of occupational health and safety before the possible increase in the number of fishermen in Lake Erçek (Van, Turkey).    
捕鱼活动一直是一项危险的职业,许多因素对渔民的健康、安全和工作条件有直接或间接的影响。本研究旨在揭示影响eraperek湖(Van,土耳其)小规模渔民职业健康和安全的风险因素。在2022年3月至2022年5月期间,通过调查从渔民中获取数据,并使用“L型矩阵”方法进行评估。"没有接受职业健康和安全培训"和"不规律和长时间工作造成的疲劳"是影响渔民工作条件的重要危险因素。本研究将通过在erpaderek湖(土耳其Van)渔民数量可能增加之前进行职业健康和安全方面的风险分析,为渔民的工作效率和在以下过程中制定计划做出重大贡献。
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引用次数: 1
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Momona Ethiopian Journal of Science
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