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Thermo-mechanical properties of bio-insulation from embedding bird eggshell into ceramics for bioengineering applications 生物工程用鸟蛋壳包埋陶瓷生物绝热力学性能研究
Pub Date : 2021-08-22 DOI: 10.4314/JFAS.V13I3.21
P. Shamunee, P. Selarak, N. Tangboriboon
Incorporating bird eggshell in porcelain can improve its physical, thermal, and mechanical properties, resulting in dense porcelain products. Calcium carbonate (CaCO3) from eggshells can react with silica (SiO2) and alumina (Al2O3) in porcelain clay to form calcium feldspar or anorthite (CaAl2Si2O8), which lowers the sintering temperature to <1000 °C. In this study, 0, 5, 10, 15, and 20 vol.% bird eggshell powder was added to porcelain slips and fired at 600, 700, 800, and 900 °C for 1, 3, and 5 h. The best formula of porcelain product having good mechanical and thermal properties was obtained at 10 vol.% quail eggshell-added porcelain fired for 5 h at 900 °C. The obtained sample demonstrated a relatively low thermal expansion coefficient (1.0515x10-6 °C-1), high compressive strength (6200 N mm-2), and high hardness (12.2 ± 0.30 HV).
在瓷器中加入鸟蛋壳可以改善其物理、热学和机械性能,从而使瓷器制品致密。蛋壳中的碳酸钙(CaCO3)可与瓷粘土中的二氧化硅(SiO2)和氧化铝(Al2O3)反应生成钙长石或钙长石(CaAl2Si2O8),烧结温度可降低至<1000℃。在本研究中,将0、5、10、15和20 vol.%的鸟蛋壳粉分别添加到瓷片中,分别在600、700、800和900℃下焙烧1、3和5 h。将添加量为10 vol.%的鹌鹑蛋壳粉在900℃下焙烧5 h,得到了具有良好机械性能和热性能的最佳瓷制品配方。所得样品具有较低的热膨胀系数(1.0515 × 10-6°C-1)、较高的抗压强度(6200 N mm-2)和较高的硬度(12.2±0.30 HV)。
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引用次数: 0
Rayleigh-Benard convection study in a cavity for a shear thinning fluid 剪切变稀流体在空腔中的瑞利-贝纳德对流研究
Pub Date : 2021-08-16 DOI: 10.4314/JFAS.V13I3.14
B. Benyahia, N. A. Messouadene
  Rayleigh-Bénard's convection is a classic problem of heat transfer. Since the 1900s, studies for Newtonian fluids have been widely developed in this field and phenomena well understood. On the other hand, the complexity of non-Newtonian behavior makes the number of studies much lower. Among the non-Newtonian behavior, the shear-thinning fluid studies are even rarer. This work focuses on a numerical study of natural convection for a non-Newtonian fluid shear thinning, in the Rayleigh-Bénard configuration. The Carreau-Yasuda model describes the shear thinning behavior. The convective flow considered is confined in a cavity, which is subjected to a vertical temperature gradient, heated from below and cooled from above. The transport equations are discretized by the finite volume method and are solved numerically using a CFD code: "Ansys Fluent". The influence of the control parameters on the flow and heat transfer such as the Rayleigh 𝑅𝑎 number, the aspect ratio, 𝐴, the Prandtl numbers, 𝑃𝑟, the power index 𝑛 and the time constant 𝐸, are studied.
瑞利-巴梅纳德对流是一个经典的传热问题。自20世纪以来,对牛顿流体的研究在这一领域得到了广泛的发展,现象得到了很好的理解。另一方面,非牛顿行为的复杂性使得研究的数量大大减少。在非牛顿行为中,剪切变薄流体的研究更为罕见。这项工作的重点是非牛顿流体剪切变薄的自然对流的数值研究,在瑞利-巴姆纳德配置。careau - yasuda模型描述了剪切减薄行为。所考虑的对流流被限制在一个腔内,它受到垂直温度梯度的影响,从下面加热,从上面冷却。采用有限体积法对输运方程进行离散,并利用Ansys Fluent软件对输运方程进行数值求解。研究了瑞利𝑅𝑎数、展弦比、多项式、普朗特数、𝑟、功率指数𝑛和时间常数等控制参数对流动和换热的影响。
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引用次数: 0
Genetic diversity analysis of Tunisian olive cultivar by SNP markers 突尼斯橄榄品种遗传多样性的SNP标记分析
Pub Date : 2021-08-16 DOI: 10.4314/JFAS.V13I3.16
N. Ayadi, R. B. Ayed, Ahmed Rebai
To study the genetic diversity of 17 olive tree cultivars (Olea Europaea L.) sampled from different Mediterranean regions, we screened three SNP markers (ACP-1, ANTHO3, SOD) located in three different genes. The genotypes of the sampled cultivars were depicted via the genotyping analysis. The dendrogram based on cultivar genotypes generated by SNP markers revealed three clusters which were consistent with the established classification. In addition, we compared the results obtained with agro-morphological and chemical data using bioinformatic analyses. This work offers a more relevant classification of the genetic classification of the Tunisian olive cultivars.
为了研究来自地中海不同地区的17个橄榄树品种(Olea Europaea L.)的遗传多样性,我们筛选了3个不同基因上的3个SNP标记(ACP-1、ANTHO3、SOD)。通过基因分型分析,确定了所选品种的基因型。基于SNP标记生成的品种基因型的树形图显示了与已建立的分类一致的3个簇。此外,我们利用生物信息学分析将所得结果与农业形态和化学数据进行了比较。这项工作为突尼斯橄榄品种的遗传分类提供了一个更相关的分类。
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引用次数: 0
An assessment of the effects of herbicides on the population density of earthworms (Lumbricus terrestris) in soil 除草剂对土壤中蚯蚓种群密度影响的评价
Pub Date : 2021-08-14 DOI: 10.4314/JFAS.V13I3.11
M. Hudu, A. Issifu, I. A. Zarouk
Continuous burrowing, ingesting, turning, mixing, aeration and the improvement of the drainage of soil are the major roles played by earthworms in renewing soil fertility. Larger amounts of herbicides are applied to the soil continuously by farmers as they realize the importance of these herbicides. These herbicides could then accumulate to toxic levels in the soil and become lethal to microorganisms, plant, wild life and man. In this study, we sought to assess the effects of formulated products of glyphosate, atrazine and 2, 4-dichlorophenoxyacetic acid (2, 4-D) on the survival and reproduction of the tropical earthworm (Lumbricus terrestris). The highest number of deaths of adult worms was recorded for 2, 4-D formulation at 0.5 mg/kg and the lowest in glyphosate formulation at 0.2 mg/kg. The general trend was that, the number of cocoons reduced with increasing concentration across all the formulations of the herbicides.
蚯蚓在更新土壤肥力方面发挥的主要作用是不断地穴、采食、翻耕、混合、通气和改善土壤排水。农民意识到这些除草剂的重要性后,不断在土壤中施用大量除草剂。这些除草剂在土壤中积累到有毒水平,对微生物、植物、野生生物和人类都是致命的。在这项研究中,我们试图评估草甘膦、阿特拉津和2,4-二氯苯氧乙酸(2,4-D)的配方产品对热带蚯蚓(土地龙)生存和繁殖的影响。2,4-D制剂0.5 mg/kg的成虫死亡人数最高,草甘膦制剂0.2 mg/kg的成虫死亡率最低。总体趋势是,在所有除草剂配方中,茧的数量随着浓度的增加而减少。
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引用次数: 0
Phenol biodegradation and optimisation of cultural and physical conditions by the free cells of newly isolated phenol degrading Alcaligenes sp. AQ5-02 新分离的苯酚降解产碱杆菌AQ5-02的游离细胞对苯酚的生物降解及培养和物理条件的优化
Pub Date : 2021-08-13 DOI: 10.4314/JFAS.V13I3.13
Abubakar Aisami, S. Ahmad, N. A. Yasid, W. Johari, M. Shukor
Biological treatment is understood to be the most efficient technique for phenol removal paralleled to other physio-chemical methods. 16s rRNA sequencing for the identification. Mineral salt media with 0.5 g/L phenol as the only carbon source. Temperature, pH, salinity and nitrogen source were optimised. The effects of heavy metals on the percentage of phenol degradation with were tested. Accession number of KT693288was assigned after identification. Temperature of 25-35°C,pH 7-8 phosphate buffer were the optimum and ammonium sulphate was established to be the paramount nitrogen source at 0.4 –0.5 g/L for isolate. The optimised conditions were found reducing the incubation period to 48 h with the ability to tolerate up to 0.2 g/L sodium chloride and degraded 50% and 1.1 g/L phenol. Meanwhile, the isolate AQ5-02 can also effectively degrade1000g/L phenol in the presence of heavy metals such as Cr, Zn, and Fe.
生物处理被认为是与其他物理化学方法并行的最有效的苯酚去除技术。16s rRNA测序进行鉴定。无机盐介质以0.5 g/L苯酚为唯一碳源。对温度、pH、盐度和氮源进行了优化。考察了重金属对苯酚降解率的影响。鉴定后分配编号kt693288。温度为25 ~ 35℃,pH为7 ~ 8的磷酸盐缓冲液为最佳,以0.4 ~ 0.5 g/L的硫酸铵为主要氮源。优化后的条件将孵育时间缩短至48 h,能够耐受高达0.2 g/L的氯化钠,降解50%和1.1 g/L的苯酚。同时,分离物AQ5-02在Cr、Zn、Fe等重金属存在下也能有效降解1000g/L苯酚。
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引用次数: 0
Application of raw peach stones for hexavalent chromium removal from aqueous solution using column system 桃核原料柱法去除水溶液中六价铬的应用
Pub Date : 2021-08-13 DOI: 10.4314/JFAS.V13I3.4
F. Khemmari, K. Benrachedi
Raw biosorbent waste is a cheap and environmentally friendly material that provides good cost-benefit for the industries that use it. The objective of this study is to improve the feasibility of raw local peach stones (RPS) waste for the removal of hexavalent chromium from aqueous solution using column system. The characterization of the adsorbent (RPS) was done by using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The impact of various parameters such as flow rate (1.5,3 and 5 ml/min) and height bed (1,2 and 3 cm) on Cr(VI) adsorption onto RPS were investigated. Two models were proposed to illustrate column breakthrough curve obtained at different flow rates and bed heights. The obtained experimental results showed a better adsorption efficiency at a low flow rate (1.5 ml/min) and a bed height of 3cm. Thus this work provides the high potential of raw peach stones (RPS) for the removal of Cr(VI) ions from aqueous solution.
生生物吸附剂废物是一种廉价环保的材料,为使用它的行业提供了良好的成本效益。本研究的目的是提高当地生桃核废物利用柱系统去除水溶液中六价铬的可行性。利用傅立叶变换红外光谱(FTIR)和扫描电子显微镜(SEM)对吸附剂(RPS)进行了表征。研究了流速(1.5、3和5ml/min)和高度床(1、2和3cm)等参数对Cr(VI)在RPS上吸附的影响。提出了两个模型来说明在不同流速和床层高度下获得的柱穿透曲线。所获得的实验结果表明,在低流速(1.5ml/min)和3cm的床高度下具有更好的吸附效率。因此,这项工作提供了生桃核(RPS)从水溶液中去除Cr(VI)离子的高潜力。
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引用次数: 0
Error estimation for Differential Transform Method (DTM)solution of non-linear SIQRM biological model 微分变换法求解非线性SIQRM生物模型的误差估计
Pub Date : 2021-08-13 DOI: 10.4314/JFAS.V13I3.12
O. Odetunde
Solving a non-linear differential equation most times is difficult and requires some technicalities. Many semi-analytical methods were derived in literature to provide series solution to non-linear problem, with each method giving some level of accuracy when compared with their equivalent exact solution (or numerical solution in case exact does not exist). Thus, system of ordinary differential equations (ODEs) arising from a formulated Susceptible-Infected-Quarantine-Recovered-Immunity (SIQRM) mathematical model of a disease dynamics were solved using DTM and Pade approximation; and their results numerically compared with Runge-Kutta order 4 (RK4). The table of result shows that DTM is reliable to tackle non-linear DE while Pade approximant improves its (DTM) accuracy.
求解非线性微分方程多数时候是困难的,并且需要一些技术细节。文献中推导了许多半解析方法,为非线性问题提供级数解,与等效精确解(或不存在精确解的情况下的数值解)相比,每种方法都具有一定的精度。因此,使用DTM和Pade近似求解了由疾病动力学的易感感染检疫恢复免疫(SIQRM)数学模型产生的常微分方程组;并将它们的结果与4阶龙格-库塔(RK4)进行了数值比较。结果表明,DTM在处理非线性DE时是可靠的,而Pade近似提高了其(DTM)精度。
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引用次数: 0
3-d modelling of electrical parameters’ effects on the heating of the base of an intense light illuminated polycrystalline silicon PV cell 电参数对强光照射多晶硅光伏电池基底加热影响的三维建模
Pub Date : 2021-08-13 DOI: 10.4314/JFAS.V13I3.15
B. Soro, M. Savadogo, B. Zouma, K. E. Tchedre, I. Sourabié, I. Zerbo, M. Zoungrana, D. Bathiébo
Performances of a solar cell are significantly influenced by the heating of the base. Two phenomena contribute to the heating of the base of a PV cell: the heat due to the transfer by conduction of the solar energy radiation received by the surface of the PV cell and the heat generated inside the solar cell by various phenomena related to the movement of photogenerated electrons and holes. Thus, even if the increase of the quantity of carriers leads to improve the PV cell electrical parameters, this phenomenon also leads to the increase of some internal phenomena like thermalization, carriers braking and the carriers collisions which are sources of heating of the base of the solar cell Indeed, electrical parameters (photocurrent, photovoltage, electric power) are physical quantities related to the movement of charge carriers and also to the illumination mode, this means that changing of electrical parameters during the operation of the PV cell leads to a variation of the temperature inside the base of the PV cell. This work presents the effects of the increase of some electrical parameters (photocurrent, photovoltage, electric power) on the behaviour of the temperature of the base of a silicon PV cell under intense light illumination.
太阳能电池的性能受到基体加热的显著影响。有两种现象有助于光伏电池底座的加热:光伏电池表面接收的太阳能辐射传导产生的热量,以及与光生电子和空穴运动相关的各种现象在太阳能电池内部产生的热量。因此,即使载流子数量的增加导致PV电池电参数的改善,这种现象也会导致一些内部现象的增加,如热化、载流子制动和载流子碰撞,它们是太阳能电池底座的加热源,电参数(光电流、光电压、电功率)是与电荷载流子的移动以及照明模式相关的物理量,这意味着在PV电池的操作期间电参数的变化导致PV电池的基座内部的温度变化。这项工作介绍了在强光照射下,一些电参数(光电流、光电压、电功率)的增加对硅光伏电池基底温度行为的影响。
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引用次数: 0
Response of durum wheat (Triticum aestivum L.) to foliar application of micronutrients in salted and calcareous soil 盐碱化和钙化土壤中硬粒小麦对叶面施用微量元素的响应
Pub Date : 2021-07-30 DOI: 10.4314/JFAS.V13I3.10
B. Miloudi, A. Masmoudi, M. Masmoudi
The alkaline nature of arid regions soil usually posses a reduction in solubility and assimilability of micronutrient in soil. A study has been carried out to focus-on the effect of foliar spraying of micronutrients (Fe, Zn, Cu, Mn, Mo) on wheat cultivation-in a saline and calcareous soil. The studied growth parameters are: stem length, yield, weight of1000 seeds and weight of dry matter. According to ANOVA at 5% the following results were obtained: the Zn + Cu 87.67cm, Cu + Mn 83.63cm, Fe + Zn + Cu + Mo 83.53cm treatments exerted the best lengths in succession. For dry matter, the best treatments reported are Zn + Cu + Mo 12396.00Kg/ha, Fe + Mn + Mo  11614.67Kg/ha and Fe + Zn + Cu + Mn11415.67Kg/ha. The results of the weight of 1000 seeds are arranged as follows: Cu + Mo 44.62g was the greatest followed by, Zn + Mo 42.97g, and then by Zn + Cu + Mn + Mo 42.85g. The top ranked treatments in the yield parameter are Fe + Mo 3480.00 Kg/ha, followed by Fe + Zn + Cu + Mn 3451.00 Kg/ha, and then Mn + Mo 3442.20 Kg/ha.
干旱区土壤的碱性通常会降低土壤中微量元素的溶解度和同化能力。在盐碱化和钙质土壤中,研究了叶面喷施微量元素(铁、锌、铜、锰、钼)对小麦栽培的影响。研究的生长参数为:茎长、产量、千粒重和干物质重。5%的方差分析结果表明:Zn + Cu为87.67cm, Cu + Mn为83.63cm, Fe + Zn + Cu + Mo为83.53cm。在干物质处理方面,Zn + Cu + Mo 12396.00Kg/ha、Fe + Mn + Mo 11614.67Kg/ha和Fe + Zn + Cu + Mn11415.67Kg/ha为最佳处理。千粒重排序结果为:Cu + Mo 44.62g最大,Zn + Mo 42.97g次之,Zn + Cu + Mn + Mo 42.85g次之。产量参数最高的处理为Fe + Mo 3480.00 Kg/ha,其次为Fe + Zn + Cu + Mn 3451.00 Kg/ha, Mn + Mo 3442.20 Kg/ha。
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引用次数: 0
Detecting breast cancer through blood analysis using decision tree (J48) classification algorithm 基于决策树(J48)分类算法的血液分析检测癌症
Pub Date : 2021-07-29 DOI: 10.4314/JFAS.V13I3.8
Oladosu Oyebisi Oladimeji, A. Oladimeji
Breast cancer is the second major cause of death in the world. Breast cancer accounts for 16% of all cancer deaths worldwide. Most of the methods of detecting breast cancer very expensive and difficult such as mammography. The objective of this research paper is detecting breast cancer through blood analysis using J48 algorithm which will serve as alternative to these expensive methods. The J48 algorithm was used to classify 116 instances also,10-fold cross validation and holdout procedure were used coupled changing of random seed. Average accuracies of 84.65% and 89.99% were acquired for cross validation and holdout procedure. Although it was also discovered that Blood Glucose level is a major determinant in detecting breast cancer, it has to be combined with other attributes to make decision as a result of other health issues such as diabetes.
乳腺癌是世界上第二大死因。乳腺癌占全世界所有癌症死亡人数的16%。大多数检测乳腺癌的方法都非常昂贵和困难,比如乳房x光检查。本研究论文的目的是使用J48算法通过血液分析检测乳腺癌,该算法将作为这些昂贵方法的替代方案。采用J48算法对116个实例进行分类,并采用10倍交叉验证和保留过程,再加上随机种子的变化。交叉验证和保留程序的平均准确率分别为84.65%和89.99%。虽然也发现血糖水平是检测乳腺癌的主要决定因素,但它必须与其他属性结合起来才能做出其他健康问题(如糖尿病)的决定。
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引用次数: 0
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Journal of Fundamental and Applied Sciences
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