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Polypropylene nano-composites at high strain rate impacts: Characterization, failure modes, and modeling 高应变速率冲击下的聚丙烯纳米复合材料:表征、失效模式和建模
IF 0.3 Pub Date : 2018-05-17 DOI: 10.4314/MEJS.V10I1.3
Shishay Amare Gebremeskel, Neelanchali Asija, H. Chouhan, N. Bhatnagar
As a major challenge, development of light-weight fibre reinforced polymer (FRP) composite body armour, characterization of candidate matrix polymers at high strain rate impact is the focus in this research. Polypropylene (PP) and the nano-composites with 1-5% by weight of NC (nanoclay) platelets are the candidates considered. In the characterization phase, high strain rate impact and quasi-static loading tests were performed to figure out the limiting (failure) responses. Comparison between the material systems is, subsequently, made to nominate one matrix configuration. Enhancements of mechanical properties with increase in weight percentage of the nanoparticles are observed at both quasi-static and dynamic loadings. Observations of dispersed imposed failure modes, development of novel model for failure modulus and evaluation of peak strength values are also attempted. Keywords : Nano-composite, Impact behaviour, Analytical modelling, Polypropylene, Failure mode.
作为开发轻质纤维增强聚合物(FRP)复合材料防弹衣的一大挑战,候选基体聚合物在高应变速率冲击下的表征是本研究的重点。聚丙烯(PP)和具有1-5%重量NC(纳米粘土)片的纳米复合材料是考虑的候选者。在表征阶段,进行了高应变速率冲击和准静态载荷试验,以得出极限(失效)响应。随后,对材料系统进行比较,以指定一种矩阵配置。在准静态和动态负载下,观察到随着纳米颗粒重量百分比的增加,力学性能增强。还尝试观察分散的外加失效模式,开发新的失效模量模型和评估峰值强度值。关键词:纳米复合材料;冲击行为;分析模型;聚丙烯;失效模式。
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引用次数: 1
Simulation of Phase Meter using TINA Software 用TINA软件模拟相位计
IF 0.3 Pub Date : 2018-05-17 DOI: 10.4314/mejs.v10i1.4
A. J. Chaudhari, R. Waghulade
The use of a circuit simulator is more and more crucial in designing electrical and electronic gadgets. This technique makes it possible to obtain results when the hardware is unavailable or very costly. Simulations are widely used in the industry hence it is necessary to use it astutely. Authors tried to study an important concept about “Squaring a Signal” and further it is extended to design and simulation of phase meter. Squaring a sinusoidal lead doubling its frequency and adding the dc component. In this study squaring sine wave with frequency of 5KHz gives a negative cosine wave with frequency 10KHz along with a dc term of 2V. TINA software is used for this study. TINA software has ability to perform DC analysis, AC analysis and transient analysis. Transient analysis calculates the circuit response to various input waveforms.  Results are analyzed using transient analysis for sinusoidal input. Keywords : TINA, Simulation, Multipliers, Virtual instruments, Transient analysis, Phase.
电路模拟器的使用在设计电气和电子产品时越来越重要。这种技术使得在硬件不可用或非常昂贵时可以获得结果。模拟在工业中被广泛使用,因此有必要巧妙地使用它。作者试图研究“Squaring a Signal”的一个重要概念,并将其扩展到相位计的设计和仿真中。对正弦引线进行平方,使其频率加倍,并添加直流分量。在本研究中,将频率为5KHz的正弦波平方,得到频率为10KHz的负余弦波,直流项为2V。TINA软件用于本研究。TINA软件具有进行直流分析、交流分析和瞬态分析的能力。瞬态分析计算电路对各种输入波形的响应。使用正弦输入的瞬态分析来分析结果。关键词:TINA,仿真,乘法器,虚拟仪器,瞬态分析,相位。
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引用次数: 1
Steam-based Charging-Discharging of a PCM Heat Storage PCM蓄热器的蒸汽充放电
IF 0.3 Pub Date : 2018-05-17 DOI: 10.4314/mejs.v10i1.2
A. Tesfay, M. Kahsay, O. Nydal
Latent heat storage and efficient heat transport technology helps to utilize the intermittent solar energy for continuous and near isothermal  applications. However, many latent heat storages face challenges of storage charging, heat retaining, and discharging the stored heat. This paper tries to address the challenges of heat transportation and storage charging-discharging issues. The heat transportation from the receiver over some distance, from outside to the kitchen, is carried out with a stainless pipeline and water as heat transfer fluids. However, the  charging-discharging process is carried by conduction method with the help of fins. In addition, the stored heat is retained for about one-two days by using aerogel insulation. The latent heat is stored in a phase change material (PCM), nitrate salt (mixture of 60% NaNO 3 and 40% KNO 3 ), which melts at 222oC and has 109 J/g specific heat of fusion. The storage has the capacity of storing up to 250oC heat and supply this heat isothermally during baking in the liquid-solid phase transition. However, the sensible heat stored in the solid and liquid form of the PCM is used to perform additional applications that do not require uniform heat which includes bread baking, kita (large pancake) baking and water boiling. The low thermal conductivity of PCM is enhanced by using extended aluminum fins that are attached to the baking plate and extruded inward to the storage. In this paper, two-phase loop thermosyphon of steam is used to manage the long distance heat transportation required between the receiver (outside) and the storage (inside a house). The steam in the thermosyphon flow has restricted to a maximum working temperature of 250oC. Steam is selected for its highest heat capacity, availability and stable nature. It carries heat from the collector focus point and condenses in a coiled pipe imbedded in aluminum plate placed on top of the storage. Many fins are solidly attached to this plate to conduct the heat down to the PCM inside the storage during charging. This design configuration avoids pressure development inside the PCM storage and the charging-discharging temperature is recorded in three zones (top, middle and bottom) of the storage. The experimental and numerical results show that the heat transportation, retention and charging-discharging methods are effective. Keywords : Solar energy, PCM storage, Latent heat storage, Two-phase thermosyphon.
潜热储存和高效热传输技术有助于利用间歇太阳能进行连续和近等温应用。然而,许多潜热储存面临着储存充电、保温和释放储存热量的挑战。本文试图解决热运输和储热充放电问题的挑战。从接收器到厨房的一定距离的热传输是用不锈钢管道和水作为传热流体进行的。然而,充放电过程是在翅片的帮助下通过传导方法进行的。此外,通过使用气凝胶隔热材料,储存的热量可以保持大约一两天。潜热储存在相变材料(PCM)、硝酸盐(60%NaNO3和40%KNO3的混合物)中,该材料在222℃下熔化,具有109焦耳/克的比热。该储存器能够储存高达250摄氏度的热量,并在液固相转变的烘焙过程中等温提供热量。然而,储存在PCM的固体和液体形式中的显热用于执行不需要均匀热量的额外应用,包括面包烘焙、kita(大煎饼)烘焙和水煮。PCM的低热导率通过使用连接到烤盘并向内挤压到存储器的延伸铝翅片而得到增强。本文使用蒸汽的两相回路热虹吸管来管理接收器(室外)和存储器(室内)之间所需的长距离热传输。热虹吸管流中的蒸汽被限制在250摄氏度的最高工作温度。选择蒸汽是因为它具有最高的热容量、可用性和稳定的性质。它从收集器的焦点处携带热量,并在一个埋在储物箱顶部铝板中的盘管中冷凝。许多散热片牢固地连接到该板上,以便在充电期间将热量传导到存储器内的PCM。这种设计配置避免了PCM存储器内部的压力发展,充放电温度记录在存储器的三个区域(顶部、中间和底部)。实验和数值结果表明,传热、保温和充放电方法是有效的。关键词:太阳能,相变储能,潜热储能,两相热虹吸管。
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引用次数: 0
Effects of Indole-3-Acetic Acid on the Growth Parameters of Citrullus lanatus (Thunberg) Matsum and Nakai 吲哚-3-乙酸对香瓜松茸和中葵生长参数的影响
IF 0.3 Pub Date : 2018-05-17 DOI: 10.4314/mejs.v10i1.8
M. Ogwu
Effects of Indole-3-Acid (IAA) on Citrullus lanatus plant height, leaf number, branching and flower production were studied in order to evaluate the optimum concentrations required for growth and development. Foliar application using five different concentrations [1, 5, 10, 20 and 0 ppm IAA] was conducted twice at two weeks interval. The results suggest that as IAA concentration increases, plant height decreases with an optimum concentration of 5 ppm IAA. Mean plant height was also significantly different. More so, optimum concentration for leaf production and branching varied with varietal difference. Results obtained for number of branching suggest that 1 ppm IAA is optimum for variety A and 10 ppm is optimum for varieties B, C and D. Although flower production was poor during the study, high flower production is recorded for plants in 20 ppm IAA at 6 weeks after planting for all the varieties. This work establishes the inducing effects of different IAA concentration, which may be exploited for the commercial production of C. lanatus. Keywords : Watermelon (Citrullus lanatus), Indole-3-Acetic acid, Growth parameters, Leaf production, Plant Physiology.
为了评价生长发育所需的最佳浓度,研究了吲哚-3-酸(IAA)对柠檬株高、叶片数、分枝和产花的影响。使用五种不同浓度[1、5、10、20和0ppm IAA]的叶面施用,间隔两周进行两次。结果表明,随着IAA浓度的增加,株高降低,最适IAA浓度为5ppm。平均株高也有显著差异。更重要的是,叶片生产和分枝的最佳浓度随品种差异而变化。分枝数量的结果表明,1ppm IAA对品种A是最佳的,10ppm对品种B、C和D是最佳的。尽管在研究期间花产量很低,但在所有品种种植后6周,在20ppm IAA中的植物的花产量都很高。这项工作建立了不同IAA浓度的诱导作用,可用于商业化生产滨海藻。关键词:西瓜,吲哚-3-乙酸,生长参数,叶片产量,植物生理学。
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引用次数: 8
Effect of NPK and Blended Fertilizer Application on Nutrient Uptake and Use Efficiency of Selected Sorghum (Sorghum bicolor (L.) Moench) Varieties Under Rain-fed Condition in Sheraro District, Northern Ethiopia 埃塞俄比亚北部谢拉罗地区雨养条件下施用NPK和混合肥料对高粱(Sorghum bicolor(L.)Moench)品种养分吸收和利用效率的影响
IF 0.3 Pub Date : 2018-05-17 DOI: 10.4314/MEJS.V10I1.10
Redai Weldegebriel, T. Araya, Yemane G. Egziabher
Sorghum (Sorghum bicolor (L.) Moench) is an important cereal crop and stable food for the semi-arid small scale farming communities in the third world. Even though, it is highly adapted to different agro-ecological conditions, its yield is constrained by different factors including declining soil fertility and improper utilization of fertilizer. Results of the research conducted in Shire-Mytsebri Agricultural Research Center at Sheraro sub-site during the main cropping season of 2016 are presented in the paper. The aim was to investigate the effect of NPK; and blended fertilizer on nitrogen, phosphorus, and potassium uptake; and nutrient use efficiency of selected sorghum varieties. The treatments are comprised of factorial combination of ten levels of fertilizers including the recently recommended [N, P, Blanket recommendation (NP), NPK, NPS, NPKS, NPKSZn, NPKSZnB, NPKSZnB (after Agricultural Transformation Agency, ATA) and Control (0)]. Two sorghum varieties (Melkam and Dekeba) were tested in a Factorial Randomized Complete Block Design with three replications. The data were computed using four agronomic indices, which are commonly used to describe nutrient (N, P and K) uptake and use efficiency. The results indicate that there is a significant interaction effect of fertilizer treatments and sorghum varieties on majority of the parameters studied. Application of NPKSZn blended fertilizer significantly enhanced nutrient uptake and use efficiency. The highest total N (78.70 kg ha-1), P (51.19 kgha-1) and K (74 kg ha-1) uptake and use efficiency in Melkam variety treated by fertilizer contained NPKSZn brought higher yield (5541 kg ha-1). Increasing uptake of the major nutrient elements ensured ample nutrient availability for normal growth and high yield of sorghum. Thus, application of macronutrients in combination with micronutrients increased sorghum yield and concomitantly improved N, P and K uptake, and nutrient use efficiency for the sorghum varieties used in the study. Therefore, it is recommended that in the study area and other similar areas blended fertilizer 41N-46P-13.7K-9.25S-1.72Zn kg ha-1 be used to achieve higher yields.
高粱(Sorghum bicolor(L.)Moench)是第三世界半干旱小规模农业社区的重要谷物作物和稳定食物。尽管它高度适应不同的农业生态条件,但其产量受到不同因素的制约,包括土壤肥力下降和肥料利用不当。本文介绍了Shire Mytsebri农业研究中心Sheraro分中心在2016年主要种植季节进行的研究结果。目的是研究NPK的作用;以及混合肥料对氮、磷和钾吸收的影响;以及所选高粱品种的养分利用效率。处理由十个水平的肥料的因子组合组成,包括最近推荐的[N,P,Blanket推荐(NP),NPK,NPS,NPKS,NPKSZn,NPKSZnB,NPKSZnB(农业转型机构后,ATA)和对照(0)]。两个高粱品种(Melkam和Dekeba)在因子随机完全块设计中进行了三次重复试验。数据是使用四个农艺指标计算的,这四个指标通常用于描述养分(N、P和K)的吸收和利用效率。结果表明,肥料处理和高粱品种对所研究的大多数参数都有显著的交互作用。施用NPKSZn复合肥可显著提高养分吸收和利用效率。施用含NPKSZn的肥料处理后,麦甘品种的总氮(78.70 kg ha-1)、磷(51.19 kg ha-)和钾(74 kg ha-。对主要营养元素的吸收增加确保了高粱正常生长和高产所需的充足营养。因此,大量营养素与微量营养素的结合应用提高了高粱产量,同时提高了研究中使用的高粱品种的氮、磷、钾吸收和营养利用效率。因此,建议在研究区和其他类似地区使用混合肥料41N-46P-13.7K-9.25S-1.7Zn kg ha-1以获得更高的产量。
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引用次数: 15
Geological and Geomechanical Properties of Abraha-Atsibha and Wukro rock-hewn churches and its surroundings, Tigray Region, Northern Ethiopia 埃塞俄比亚北部提格雷地区Abraha-Atsibha和Wukro岩凿教堂及其周围的地质和地质力学性质
IF 0.3 Pub Date : 2017-11-30 DOI: 10.4314/MEJS.V9I2.4
A. Abay, G. Mebrahtu, B. Konka
Globally well-known ancient rock-hewn churches are present in Ethiopia in general and particularly in the central and eastern parts of Tigray regional state. They are important sites of heritage and tourism. Most of them are facing destabilization  problem in different degree due to natural and anthropogenic factors. Among the affected, two churches hewn into sandstone located near Abreha-Atsibaha and  Wukro (Kirkos/Cherkos church) in Tigray region were chosen for detailed study in  terms of geological and engineering geological condition of the rocks in to which  they are hewn. Both of them are affected by weathering and seepage. Both are  carved into Mesozoic Adigrat sandstone that occupy higher elevations in  topography, red in color and with iron and silica-rich alternating bands. Petrographic data suggest that the rock is dominated by quartz followed by feldspars; opaque and heavy minerals; pore spaces and carbonate/iron/silica cement. The rock is  characterized by low to medium unconfined compressive strength. The alternating  bands with varying mineralogical composition differ in mechanical properties and are responding differently to weathering and erosion. This is resulting in the  development of minor spalling, pitting etc in the pillars, walls and roofs of the  churches. Keeping the geological condition in view remedial measures are to be planned to minimize deterioration with time. Keywords : Geological, Geomechanical, Rock hewn-Church, Abraha-Atsibaha, Tigray, Ethiopia.
全球知名的古代岩凿教堂普遍存在于埃塞俄比亚,特别是在提格雷州的中部和东部地区。它们是重要的遗产和旅游景点。由于自然和人为因素的影响,它们大多面临不同程度的不稳定问题。在受影响的教堂中,选择了位于Tigray地区Abreha-Atsibaha和Wukro (Kirkos/Cherkos教堂)附近的两座砂岩教堂,对其所处岩石的地质和工程地质条件进行了详细研究。两者均受风化和渗流的影响。两者都雕刻在中生代亚得喀特砂岩中,该砂岩地势较高,颜色呈红色,具有富含铁和硅的交替带。岩石学资料表明,岩石以石英为主,长石次之;不透明和重矿物;孔隙空间和碳酸盐/铁/硅水泥。岩石的特点是低至中等的无侧限抗压强度。不同矿物组成的交替带具有不同的力学性能,对风化和侵蚀的反应也不同。这导致教堂的柱子、墙壁和屋顶出现轻微的剥落、点蚀等现象。考虑到地质状况,应计划补救措施,以尽量减少随着时间的推移而恶化。关键词:地质,地质力学,岩石切割-教堂,Abraha-Atsibaha, Tigray,埃塞俄比亚
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引用次数: 0
Evaluation of Land Suitability for Selected Tree Species in the Mesozoic Highlands of Ethiopia 埃塞俄比亚中生代高地选定树种的土地适宜性评估
IF 0.3 Pub Date : 2017-11-30 DOI: 10.4314/MEJS.V9I2.6
K. Teka, Yemane Welday
This paper aimed at evaluating the potential of the different soil attributes for plantation of selected forest trees ( Faidherbia albida, Eucalyptus camaldulensis and Balanitus aegiptica ) dominantly grown in the northern highlands of Ethiopia. The study was conducted at Korir watershed, northern Ethiopia. The method used to evaluate the land suitability was based on the FAO approach for land evaluation for forestry. The results of the evaluation revealed that suitability classes of these trees range from highly suitable (S1) to permanently not suitable (N). Eucalyptus camaldulensis was highly suitable on the relatively gentle valley bottom and foot slope (6% of the area) having greater soil depth while unsuitable in majority (about 58%) of the area. Both Faidherbia albida and Balanitus aegyptiaca were suitable in more than 85% of the study area. The major limiting factors were the steep slope and shallow soil depth in major part of the area. Hence, evaluating the land potential for individual species and assigning these species based on their land requirements should be done before plantation so as to increase the trees' survival rate. Keywords : Faidherbia albida , Eucalyptus camaldulensis, Balanitus aegiptica , Suitability, Ethiopia
本文旨在评估不同土壤属性对种植埃塞俄比亚北部高地主要生长的选定林木(Faidherbia albida、Eucalyptus camaldulensis和Balanitus aegiptica)的潜力。这项研究是在埃塞俄比亚北部的科里尔流域进行的。用于评估土地适宜性的方法以粮农组织林业土地评估方法为基础。评估结果表明,这些树木的适宜性等级从高度适宜(S1)到永久不适宜(N)不等。赤桉非常适合在土壤深度较大的相对平缓的谷底和坡脚(6%的地区),而不适合在大部分地区(约58%)。在85%以上的研究区域内,埃及斑蝶和埃及斑蝶都是合适的。主要限制因素是该地区大部分地区的陡坡和浅土层。因此,应在种植前评估单个物种的土地潜力,并根据其土地需求对这些物种进行分配,以提高树木的存活率。关键词:Faidherbia albida,赤桉,Balanitus aegiptica,适宜性,埃塞俄比亚
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引用次数: 2
Effect of Combined Application of Organic and Mineral Nitrogen and Phosphorus Fertilizer on Soil Physico-chemical Properties and Grain Yield of Food Barley (Hordeum vulgare L.) in Kaffa Zone, South-western Ethiopia 有机与无机氮磷肥配施对埃塞俄比亚西南部Kaffa地区食用大麦土壤理化性质及产量的影响
IF 0.3 Pub Date : 2017-11-30 DOI: 10.4314/mejs.v9i2.8
T. Tana, M. Woldesenbet
Low soil fertility is one of the major factors limiting the yield of barley in Kaffa Zone, south-western Ethiopia. The problem is more severe in the Zone due to soil erosion and nutrient leaching caused by heavy and continuous rainfall. Thus, field  experiment was conducted to assess the effect of combined organic and mineral  nitrogen (N) and phosphorus (P) on selected soil physico-chemical properties and  on grain yield of food barley in Ghimbo and Adiyo districts, south-western Ethiopia. Fourteen treatments comprising two organic fertilizer rates, i.e. 2.5 and 5 t ha −1 of Farm Yard Manure (FYM) and Vermicomost (VC) combined with three levels of  mineral NP (25, 50 and 75% of recommended rates of NP), 100% recommended  rate of inorganic NP (23 kg N ha -1 and 46 kg P 2 O 5 ha -1 ) and no fertilizer  application (control) in randomized complete block design on clay soil in Ghimbo and clay loam soil in Adiyo with three replications. Results indicated that the application of FYM in combination with different levels of recommended rates of inorganic N and P significantly improved most of the soil physico-chemical properties and  significantly increased the grain yield of food barley over the application of 100%  mineral NP alone and the control. The application of 5 t FYM ha −1 in combination  with 75% recommended rates of inorganic N and P (17.25 kg N ha −1 and 34.5 kg  P 2 O 5 ha −1 ) was found to be superior and increased soil organic carbon content by 36 and 44.6%, available P by 70.5 and 78.2%, available K by 42.5 and 26.3%, and increased yield of barley by 76.8 and 83.5% in Adiyo and Ghimbo, respectively, over the application of 100% recommended rate of inorganic N and P only. Therefore, it can be concluded and recommended that the application of 5 t FYM ha −1 in combination with 75% of the recommended rates of inorganic N and P  (17.25 kg N ha −1 and 34.5 kg P 2 O 5 ha −1 ) can improve soil fertility and can  increase yield of food barley in the study area. Keywords: Farmyard manure, Nitrogen, Phosphorous, Vermicompost, Ethiopia.
土壤肥力低是限制埃塞俄比亚西南部Kaffa地区大麦产量的主要因素之一。由于强降雨和持续降雨造成的土壤侵蚀和养分流失,该地区的问题更加严重。因此,在埃塞俄比亚西南部的Ghimbo和Adiyo地区进行了田间试验,以评估有机和矿物氮(N)和磷(P)对选定土壤物理化学性质和粮食大麦产量的影响。14个处理包括两种有机肥料施用率,即2.5和5 t ha−1的农田肥料(FYM)和Vermicmost(VC)与三种水平的矿物NP(NP推荐施用率的25%、50%和75%),在Ghimbo粘土和Adiyo粘壤土上进行的随机完全块区设计中,无机NP(23 kg N ha-1和46 kg P 2 O 5 ha-1)和不施肥(对照)的推荐率为100%,三次重复。结果表明,与单独施用100%无机氮磷和对照相比,FYM与不同无机氮磷推荐施用水平的组合显著改善了大部分土壤理化性质,并显著提高了粮食大麦的产量。施用5 t FYM ha−1与75%的无机氮和磷推荐量(17.25 kg N ha−1和34.5 kg P 2 O 5 ha−1)效果较好,分别使阿迪约和吉姆博的土壤有机碳含量增加了36和44.6%,有效磷增加了70.5和78.2%,有效钾增加了42.5和26.3%,大麦产量增加了76.8和83.5%,超过仅施用100%推荐速率的无机氮和磷。因此,可以得出结论并建议,5 t FYM ha−1与75%的无机氮和磷推荐施用量(17.25 kg N ha−1和34.5 kg P 2 O 5 ha−1)相结合,可以提高研究区的土壤肥力,并可以提高食用大麦的产量。关键词:农家肥,氮,磷,蚯蚓粪,埃塞俄比亚。
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引用次数: 9
Global Variations of Ionospheric Total Electron Content (TEC) Derived from GPS Global Ionospheric Maps 基于GPS全球电离层地图的电离层总电子含量(TEC)全球变化
IF 0.3 Pub Date : 2017-11-30 DOI: 10.4314/mejs.v9i2.2
Hintsa Gebreselasse, G. Abraha
This paper is aimed to investigate diurnal, monthly and seasonal variation of  ionospheric total electronic content (TEC) obtained from two GPS satellites IGS and COD and to inspect mean VTEC Correlation between the two satellites by the year  of 2008. TEC is defined by the integral of electron density in a 1 m 2 column along  the signal transmission path. It is an important parameter to monitor possible space weather impacts. The processed and archived data taken from IGS and COD  satellites has been imported in to a MATLAB code which gave us the results of the  value of VTEC. Results of the two satellites revealed that, Out of the selected  equinox and solstice day’s maximum value of TEC is recorded on March 20/2008  over North and South west equator due to the maximum solar radiation reaching to  the ionosphere of the Earth. On the contrary, the Minimum peak ionospheric TEC  value is recorded on June 21/2008 over south Asia particularly Srilanka and  Bangladesh due to emission of low solar radiation. As regards to monthly variations  of ionospheric TEC, results of IGS and COD satellites show that highest mean TEC  value is recorded on March and July recorded the least peak TEC value. Results  regarding to seasonal variation also revealed that E-Season recorded maximum  TEC value and least TEC value is recorded on J-Season. The observations of the two satellites also show that the mean TEC value presents stronger solar activity sensitivity at lower-latitude bands than the middle and high latitudes. In general,  there was a very high correlation between Mean TEC value recorded by IGS and COD satellites by the year of 2008 in all low, middle and high latitudes. Keywords : IGS and COD satellites, GPS, Ionosphere, Low, middle and  high-latitudes, TEC.
本文旨在研究IGS和COD两颗GPS卫星电离层总电子含量(TEC)的日变化、月变化和季节变化,并检验到2008年这两颗卫星的平均VTEC相关性。TEC由沿信号传输路径的1m 2列中的电子密度的积分来定义。它是监测可能的空间天气影响的一个重要参数。IGS和COD卫星的处理和存档数据已导入MATLAB代码,该代码为我们提供了VTEC值的结果。两颗卫星的结果显示,在选定的春分和至日中,由于到达地球电离层的最大太阳辐射,TEC的最大值于2008年3月20日在北赤道和西南赤道上空记录。相反,2008年6月21日,南亚,特别是斯里兰卡和孟加拉国,由于太阳辐射量低,记录到电离层TEC的最小峰值。关于电离层TEC的月变化,IGS和COD卫星的结果显示,3月的TEC平均值最高,7月的TEC峰值最低。关于季节变化的结果还表明,E季节记录的TEC值最大,J季节记录的TC值最小。两颗卫星的观测结果还表明,平均TEC值在低纬度波段比在中高纬度波段表现出更强的太阳活动敏感性。总的来说,截至2008年,IGS卫星记录的平均TEC值与COD卫星记录的所有低纬度、中纬度和高纬度地区的TEC值之间存在非常高的相关性。关键词:IGS和COD卫星,GPS,电离层,低、中、高纬度,TEC。
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引用次数: 2
Effect of Different Cereal Blends on the Quality of Injera a Staple Food in the Highlands of Ethiopia 不同谷物混合对埃塞俄比亚高地因杰拉主食品质的影响
IF 0.3 Pub Date : 2017-11-30 DOI: 10.4314/mejs.v9i2.7
A. Abraha, F. Abay
Majority of the Ethiopian population are dependent on tef ( Eragrostis tef ( Zucc )  trotter) flour to make injera, a staple food in Ethiopia, although injera could be made  from different cereals. The price of tef, however, is high and the yield potential of the  crop is low. Thus, searching for alternative cheaper grains and developing a blend of  different cereal flours that can produce injera of acceptable quality and improved  nutritional value would be important. This study was conducted to evaluate the  sensory quality of injera made from a blend of different cereals (Tef, barley, sorghum  and maize) with differing ratios: 100, 75, 50 and 25%. The sensory evaluation of  injera was conducted at Mekelle University in a replicated trial. The results  revealed  significant differences among the cereal flour blends in injera texture,  mouth feeling, suppleness and overall rate, while colour, taste and the appearance of injera surface gas holes were non- significant. Injera made from 100% tef flour got the highest preference rank in terms of the texture, mouth feeling, suppleness and overall ratings. Injera made from 50:50 tef + barley blend was the second best in  both texture and suppleness followed by 50:50 tef + sorghum, 50: 50 tef + maize  blends and tef + barley + sorghum blend of equal ratio. Similarly, results from blend of tef + barley + maize, tef + sorgum + maize and from the four varietal blends in  equal ratios produced very good injera quality. From the study results injera quality ranked next to sole tef (tef + barley, tef + sorghum, tef + maize in 50:50 blends and tef + barley + sorghum in equal ratios) could be used as an alternative option for  injera utilization and could provide nutritional and dietary benefits to consumers. Keywords : Sensory attributes, Injera quality, cereal flour blends, Tef, Ethiopia.
大多数埃塞俄比亚人依靠tef (Eragrostis tef (Zucc) trotter)面粉来制作injera,这是埃塞俄比亚的主食,尽管injera可以由不同的谷物制成。然而,tef的价格很高,而该作物的产量潜力很低。因此,寻找更便宜的替代谷物和开发一种不同谷物面粉的混合物,可以生产出质量可接受、营养价值更高的英拉,这将是很重要的。本研究对不同谷物(Tef、大麦、高粱和玉米)以不同比例(100、75、50和25%)混合制成的injera的感官品质进行了评价。在Mekelle大学进行的一项重复试验中,对injera进行了感官评估。结果表明,不同谷物粉混合后的面筋质地、口感、柔软度和整体率差异显著,而面筋颜色、口感和表面气孔外观差异不显著。由100% tef面粉制成的Injera在质地、口感、柔软度和总体评分方面获得了最高的偏好。50:50 tef +大麦的织构和柔软度次之,其次为50:50 tef +高粱、50:50 tef +玉米和等比例tef +大麦+高粱。同样,tef +大麦+玉米、tef +高粱+玉米以及4个品种按相同比例混合的结果也产生了非常好的英杰拉品质。从研究结果来看,仅次于单一tef (tef +大麦,tef +高粱,tef +玉米50:50混合,tef +大麦+高粱等比例)的英杰拉品质可以作为英杰拉利用的替代选择,可以为消费者提供营养和膳食效益。关键词:感官属性,英杰拉品质,谷物面粉混合物,Tef,埃塞俄比亚。
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引用次数: 7
期刊
Momona Ethiopian Journal of Science
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