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Structural Characterization of Salts Using X-ray Fluorescence Technique 利用 X 射线荧光技术确定盐的结构特征
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-01-06 DOI: 10.14500/aro.11418
Bashdar I. Meena, Hawbash H. Karim, Kurdistan F. Aziz, F. Chaqmaqchee, Dashne M. Kokhasmail, K. N. Hussein
This study investigates the structure of 21 table salts that were collected from different local markets in the Kurdistan region of Iraq. The major trace elements and iodine concentrations in tablesalt are analyzed through the X-ray fluorescence (XRF) technique and the titration method, respectively. The study shows that using XRF spectral analysis, the collected table salt samples are rich in chlorine, sodium, and contain a lower percentage of bromine, strontium, tin, tellurium, and iodine. Moreover, these samples have a high percentage of sulfur and sirconium, where the molybdenum is >0.2%. Other elements such as zinc and copper are essential and found in low concentrations <0.0086% and 0.001%. Iodine is a trace element that is necessary nutrients for human life, and it is naturally present in some foods. Iodine deficiency is brought on by a lack of iodine consumption. Iodized salt is highly recommended as a source of iodine to prevent iodine deficiency disease. Iodine is added to table salt in two different ways, either through iodate or through iodine. The results show that only 25% of the salt samples have an adequate level of iodine, while the other samples have low or no iodine content. According to the World Health Organization, quality of salt depends on iodine concentration and other trace elements, which are necessary for human health.
本研究调查了从伊拉克库尔德斯坦地区不同地方市场收集的 21 种食用盐的结构。分别通过 X 射线荧光(XRF)技术和滴定法分析了食盐中的主要微量元素和碘浓度。研究结果表明,利用 X 射线荧光光谱分析,收集到的食盐样本含有丰富的氯、钠,溴、锶、锡、碲和碘的含量较低。此外,这些样本中硫和硒的含量较高,其中钼的含量大于 0.2%。其他元素如锌和铜是必需元素,含量较低,分别为 0.0086% 和 0.001%。碘是一种微量元素,是人类生命所必需的营养物质,天然存在于某些食物中。碘缺乏症是由于碘摄入不足引起的。为了预防碘缺乏病,人们强烈建议将碘盐作为碘的来源。碘通过两种不同的方式添加到食盐中,一种是通过碘酸盐,另一种是通过碘。结果显示,只有 25% 的食盐样本碘含量充足,其他样本碘含量较低或没有碘。世界卫生组织指出,食盐的质量取决于碘的浓度和其他微量元素,这些都是人体健康所必需的。
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引用次数: 0
An Ultra-wideband Low-power Low-noise Amplifier Linearized by Adjusted Derivative Superposition and Feedback Techniques 利用调整衍生叠加和反馈技术线性化的超宽带低功耗低噪声放大器
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-12-23 DOI: 10.14500/aro.11267
Mohsen Alirezapoori, Mohsen Hayati, M. A. Imani, F. Shama, Pouria Almasi
Ultra-wideband (UWB) applications require low-power and low-noise amplifiers (LNAs) that can operate over a wide frequency range. However, conventional LNAs often suffer from poor linearity and high-power consumption. This research work proposes a novel LNA design that uses the adjusted derivative superposition (DS) technique and feedback to improve the linearity and reduce the power consumption of UWB LNAs. The DS technique enhances the third-order intermodulation (IM3) cancellation by adjusting the bias currents of the transistors, whereas the feedback improves the stability and input matching of the LNA. The LNA is implemented using a degenerated common source topology in a 180 nm standard CMOS technology. The simulation results show that the LNA achieves a power gain of 10–12.2 dB, an input third-order intercept point (IIP3) of about 12 dBm, and a noise figure of less than 2.5 dB over the UWB frequency band of 3.1–10.6 GHz. The input reflection coefficient is less than -10 dB, and the power consumption is 11.6 mW with a 1.5 V power supply. The designed LNA offers a novel and innovative solution for UWB applications that significantly improve the performance and efficiency of UWB LNAs whereas reducing the cost and complexity of implementation.
超宽带 (UWB) 应用需要能在宽频率范围内工作的低功耗、低噪声放大器 (LNA)。然而,传统的 LNA 通常线性度差、功耗高。本研究提出了一种新型 LNA 设计,利用调整导数叠加(DS)技术和反馈来提高 UWB LNA 的线性度并降低功耗。导数叠加(DS)技术通过调整晶体管的偏置电流来增强三阶互调(IM3)消除,而反馈则能改善 LNA 的稳定性和输入匹配。该 LNA 采用退化共源拓扑结构,采用 180 nm 标准 CMOS 技术实现。仿真结果表明,该 LNA 在 3.1-10.6 GHz 的 UWB 频段内实现了 10-12.2 dB 的功率增益、约 12 dBm 的输入三阶截取点 (IIP3),以及低于 2.5 dB 的噪声系数。输入反射系数小于 -10 dB,1.5 V 电源功耗为 11.6 mW。所设计的低噪声放大器为 UWB 应用提供了一种新颖、创新的解决方案,可显著提高 UWB 低噪声放大器的性能和效率,同时降低实施成本和复杂性。
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引用次数: 0
Magnetic and Electrical Properties of Electrodeposited Nickel Films 电沉积镍薄膜的磁性和电性
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-12-08 DOI: 10.14500/aro.11211
M. Sultan
Magnetic and electrical properties of nickel (Ni) thin films produced by the electrodeposition technique under a range of growth times (30, 40, and 60 s) are investigated thoroughly using Magneto-Optical Kerr Effect (MOKE) magnetometry and Magneto-Resistance setup, respectively. To deeply understand these properties, the elemental composition, surface morphology, and bulk crystalline structure are analyzed using energy dispersive X-ray spectroscopy (EDS) with high-resolution scanning electronmicroscopy (HRSEM), grazing incidence X-ra y reflectivity(GIXR), and X-ray diffraction measurements, respectively. EDSanalysis confirms that these samples are free from impurities andcontamination. An increase in coercive fields (~67 Oe) with widedistribution (58–85 Oe) across the film area and a slight variationin the shape of the loops are noticed by decreasing the film growthtime (30 s). This is attributed to the deviations in the film surfacemorphology (defects), as confirmed by HRSEM and GIXRmeasurements. The angular dependence of the coercivity is nearlyconstant for each sample and most angles, indicating the similarityin the reversal behavior in such films.The sample resistance is foundto be ~20.3 Ω and ~2.8 Ω for films with growth times of 40 s and 60 s,respectively. The co ercivity of the AMR profiles and MOKE loops isconsistent with each other, indicating that the magnetization at thesurface performs similarly to that of their bulks. This article givesan indication that Ni films produced by this technique under suchconditions are soft at longer deposition times and largely isotropic,which is more preferable in some magnetic applications.
利用磁光克尔效应(MOKE)磁强计和磁阻仪分别研究了电沉积技术制备的镍薄膜在生长时间(30,40和60 s)范围内的磁性和电学性能。为了深入了解这些性质,分别使用高分辨率扫描电子显微镜(HRSEM)的能量色散x射线能谱(EDS)、掠射x射线反射率(GIXR)和x射线衍射测量分析了元素组成、表面形貌和体晶结构。eds分析确认这些样品没有杂质和污染。通过减少薄膜生长时间(30秒),可以注意到在薄膜区域广泛分布(58-85欧)的矫顽力场(~67欧)的增加和环路形状的轻微变化。这是由于薄膜表面形貌(缺陷)的偏差,HRSEM和gixr测量证实了这一点。对于每个样品和大多数角度,矫顽力的角依赖性几乎是恒定的,表明这两种薄膜的反转行为相似。当膜生长时间为40 s和60 s时,样品电阻分别为~20.3 Ω和~2.8 Ω。AMR曲线和MOKE环的矫顽力相互一致,表明表面的磁化性能与它们的体积相似。这篇文章指出,在这种条件下,用这种技术生产的Ni薄膜在较长的沉积时间内是柔软的,并且在很大程度上是各向同性的,这在一些磁性应用中更可取。
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引用次数: 0
Effect of Waste Glass on Properties of Treated Problematic Soils 废玻璃对处理过的问题土壤性质的影响
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-12-08 DOI: 10.14500/aro.11284
Jaylan H. Sherwany, Jamal I. Kakrasul, Jie Han
Soils are the most commonly used construction material in engineering projects. Fine-grained soils especially clayey soil may expand and lose strength when wet and shrink when dry, resulting in a significant volume change. Construction on weak soils has created challenges for various civil engineering projects worldwide, including roadways, embankments, and foundations. As a result, improving weak soil is vital, particularly for highway construction. The properties of this type of soil can be improved by waste-recycled materials such as waste glass (WG). The WG must be crushed and ground to a fine powder first and then can be mixed in various proportions with the soil. The primary objective of this study is to review the effect of WG on geotechnical properties of fine-grained soils treated by WG. To demonstrate the effects, the treated fine-grained soils at varying percentages of WG are compared with untreated soils. Physical properties (e.g., Atterberg limits, swelling, and maximum dry density), mechanical properties (e.g., California bearing ratio, and unconfined compressive strength) are evaluated. The test results from the literature show that adding a certain percentage of WG leads to a substantial effect on the properties of fine-grained soils; hence, using WG could reduce the required thickness of subbases in the construction of driveways and roads.
土壤是工程项目中最常用的建筑材料。细粒土尤其是粘性土在潮湿时会膨胀并失去强度,在干燥时会收缩,从而导致体积发生显著变化。在软弱土壤上施工给世界各地的各种土木工程项目(包括道路、堤坝和地基)带来了挑战。因此,改良软土至关重要,尤其是在公路建设中。废玻璃(WG)等废物回收材料可以改善这类土壤的性质。首先必须将废玻璃碾碎并研磨成细粉,然后才能按不同比例与土壤混合。本研究的主要目的是审查 WG 对经 WG 处理的细粒土岩土特性的影响。为了证明这些影响,我们将不同比例 WG 处理过的细粒土与未处理过的土进行了比较。对物理特性(如 Atterberg 限值、膨胀性和最大干密度)和机械特性(如加州承载比和无侧限抗压强度)进行了评估。文献中的测试结果表明,添加一定比例的 WG 会对细粒土的特性产生重大影响;因此,使用 WG 可以减少车道和道路建设中所需的路基厚度。
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引用次数: 0
Peperites Peperites
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-11-22 DOI: 10.14500/aro.11363
Jabbar M. A. Qaradaghi, Tola A. Merza
Peperites are volcanosedimentary materials generated by the mingling of magma and unconsolidated wet sediments. They have unique insights into submarine volcanisms and the tectonic environments where they form. For the 1st time, the authors identified two types of peperites (blocky and fluidal) hosted by micritic limestone rocks in the Walash Volcanosedimentary Group of the Mawat area, Kurdistan Region-Iraq. They are designated as peperitic facies one and two (PF1 and PF2) and consist of black basaltic rocks mixed with chocolate-brown micritic limestone rocks. Their abundance demonstrates the contemporaneity of deep marine sediment deposition and submarine volcanism during Walash’s nascent arc. Despite hydrothermal alteration, the basaltic rocks retained their magmatic textures. Basaltic rocks comprise mainly albite, anorthite, diopside, hematite, and alkali-feldspar. Calcite dominates micritic limestone rocks, while quartz is minor. Based on geochemical data, igneous sections are basaltic rocks with tholeiitic series that are strongly enriched in Light Rare Earth Elements with low concentration ratios of (La/Yb) and (Sr/Y), indicating geochemical affinity to normal island arc basalt with a primitive arc signature. Furthermore, their formation is thought to be caused by partial melting of subducted slabs deep within 30 km and the associated derived fluids above the subducted slab. Thirteen species of planktonic foraminifera (Morozovella) are identified through paleontological research and biostratigraphy. Using these various tools lead the authors to illustrate the tectonic setting of the formation of peperitic rocks in arc fronts of the subducted Walash arc during the Middle to Late Paleocene (60 Ma).
辉绿岩是岩浆与未固结湿沉积物混合生成的火山沉积物。它们对海底火山活动及其形成的构造环境有着独特的见解。作者首次在伊拉克库尔德斯坦地区马瓦特的瓦拉什火山沉积岩群中发现了两种类型的辉绿岩(块状和流体状),它们由微砂岩石灰岩承载。它们被命名为佩珀岩面一(PF1)和面二(PF2),由黑色玄武岩与巧克力棕色微晶灰岩混合组成。它们的丰富程度表明,在瓦拉什新生弧期间,深海沉积物沉积和海底火山活动是同时进行的。尽管经过热液蚀变,玄武岩仍保留了岩浆质地。玄武岩主要由白云石、阳起石、透辉石、赤铁矿和碱性长石组成。方解石在微晶石灰岩中占主导地位,石英次之。根据地球化学数据,火成岩剖面为玄武岩,具有透辉石系列,轻稀土元素含量高,(La/Yb)和(Sr/Y)浓度比低,表明在地球化学上与具有原始弧特征的正常岛弧玄武岩相近。此外,它们的形成被认为是由 30 千米深的俯冲板块部分熔化以及俯冲板块上方的相关衍生流体造成的。通过古生物学研究和生物地层学,确定了 13 种浮游有孔虫(Morozovella)。利用这些不同的工具,作者说明了在古新世中、晚期(60Ma),在俯冲的瓦拉什弧的弧前形成的蝶岩的构造环境。
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引用次数: 0
Atherogenic Index of Plasma in the Three Trimesters of Pregnancy 妊娠三个孕期的血浆致动脉粥样硬化指数
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-11-21 DOI: 10.14500/aro.11337
Bana K. Hamadameen, Sara S. Hamad
This study investigates the change that occurs for atherogenic index of plasma (AIP) which is a very good marker for the evaluation of the risk of atherogenicity and cardiometabolic health. This study indicates the logarithm of the triglyceride and high-density lipoprotein cholesterol (log [TG/HDL-c]). The parameters of triglycerides (TG) and high-density lipoprotein cholesterol (HDL-c) are estimated and compared with the control cases. The AIP is calculated for each case during pregnancy in first, second, and third trimesters separately and each is compared with control cases. The study population comprised (80) women aged between (20–40) years distributed to (20) healthy non-pregnant women, (20) in the first trimester, (20) in the second trimester, and (20) in the third trimester in Koya health centers. The results of this study showed a significant increase in the TG level in both the second and third trimesters of pregnancy compared to the control cases. Whereas, in the first trimester of pregnancy, it can be assumed that there is a non-significant decrease of TG level rather than control cases. As well as the serum levels of HDL for all three trimesters of pregnancy displayed non-significant changes when compared to non-pregnant cases. These data illustrate that the AIP levels during both the second and third trimesters of pregnancy are significantly higher, as compared to control cases, whereas the AIP levels in the first trimester are non-significantly elevated, as compared with control cases
血浆动脉粥样硬化指数(AIP)是评估动脉粥样硬化风险和心脏代谢健康的一个很好的指标,本研究调查了血浆动脉粥样硬化指数(AIP)的变化。这项研究显示了甘油三酯和高密度脂蛋白胆固醇的对数(log [TG/HDL-c])。对甘油三酯(TG)和高密度脂蛋白胆固醇(HDL-c)的参数进行估算,并与对照病例进行比较。分别计算每个病例在妊娠头三个月、第二个月和第三个月的 AIP,并与对照病例进行比较。研究对象包括(80)名年龄在(20-40)岁之间的妇女,其中(20)名是健康的非孕妇,(20)名是在科亚保健中心怀孕的前三个月,(20)名是在怀孕的后三个月,(20)名是在怀孕的后三个月。研究结果表明,与对照病例相比,妊娠后三个月和妊娠后三个月的总胆固醇水平都有明显增加。而在妊娠的前三个月,可以认为总胆固醇水平与对照组相比没有明显下降。此外,与非怀孕病例相比,怀孕三个月的血清高密度脂蛋白水平均无明显变化。这些数据表明,与对照组病例相比,妊娠后三个月和三个月的 AIP 水平明显升高,而与对照组病例相比,妊娠头三个月的 AIP 水平无明显升高。
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引用次数: 0
Real-time Traffic Monitoring System Based on Deep Learning and YOLOv8 基于深度学习和 YOLOv8 的实时交通监控系统
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-11-16 DOI: 10.14500/aro.11327
Saif B. Neamah, Abdulamir A. Karim
Computer vision applications are important nowadays because they provide solutions to critical problems that relate to traffic in a cost-effective manner to reduce accidents and preserve lives. This paper proposes a system for real-time traffic monitoring based on cutting-edge deep learning techniques through the state-of-the-art you-only-look-once v8 algorithm, benefiting from its functionalities to provide vehicle detection, classification, and segmentation. The proposed work provides various important traffic information, including vehicle counting, classification, speed estimation, and size estimation. This information helps enforce traffic laws. The proposed system consists of five stages: The preprocessing stage, which includes camera calibration, ROI calculation, and preparing the source video input; the vehicle detection stage, which uses the convolutional neural network model to localize vehicles in the video frames; the tracking stage, which uses the ByteTrack algorithm to track the detected vehicles; the speed estimation stage, which estimates the speed for the tracked vehicles; and the size estimation stage, which estimates the vehicle size. The results of the proposed system running on the Nvidia GTX 1070 GPU show that the detection and tracking stages have an average accuracy of 96.58% with an average error of 3.42%, the vehicle counting stage has an average accuracy of 97.54% with a 2.46% average error, the speed estimation stage has an average accuracy of 96.75% with a 3.25% average error, and the size estimation stage has an average accuracy of 87.28% with a 12.72% average error.
计算机视觉应用如今非常重要,因为它们能以经济高效的方式为与交通相关的关键问题提供解决方案,从而减少事故,保护生命。本文通过最先进的 you-only-look-once v8 算法,提出了一种基于前沿深度学习技术的实时交通监控系统,利用其功能提供车辆检测、分类和分割。拟议的工作可提供各种重要的交通信息,包括车辆计数、分类、速度估计和大小估计。这些信息有助于执行交通法规。拟议的系统由五个阶段组成:预处理阶段,包括摄像机校准、ROI 计算和准备源视频输入;车辆检测阶段,使用卷积神经网络模型定位视频帧中的车辆;跟踪阶段,使用 ByteTrack 算法跟踪检测到的车辆;速度估算阶段,估算被跟踪车辆的速度;以及尺寸估算阶段,估算车辆尺寸。拟议系统在 Nvidia GTX 1070 GPU 上运行的结果显示,检测和跟踪阶段的平均准确率为 96.58%,平均误差为 3.42%;车辆计数阶段的平均准确率为 97.54%,平均误差为 2.46%;速度估计阶段的平均准确率为 96.75%,平均误差为 3.25%;尺寸估计阶段的平均准确率为 87.28%,平均误差为 12.72%。
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引用次数: 0
Blackberry (Rubus fruticosus L.) Fruit Extract Phytochemical Profile, Antioxidant Properties, Column Chromatographic Fractionation, and High-performance Liquid Chromatography Analysis of Phenolic Compounds 黑莓(Rubus fruticosus L.)水果提取物植物化学特征,抗氧化特性,柱层析分馏,酚类化合物的高效液相色谱分析
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-08-25 DOI: 10.14500/aro.11189
Aryan F. Qader, M. Yaman
This groundbreaking study explores the untapped potential of blackberries, a member of the Rubus genus in the Rosaceae family, and sheds light on their remarkable health and medicinal properties. Unlike previous research conducted in other regions, this investigation focuses specifically on the blackberry fruit’s phytochemical constituents, chromatographic fractionations, and antioxidant activities in the Koisinjaq and Erbil villages of Northern Iraq. The research unveils seven distinct fractions obtained through column chromatography, with Fractions 2 and 3,5 found to contain p-coumaric acid and rutin, respectively, while Fraction 2 also houses chlorogenic acid. The analysis reveals the impressive richness of the methanolic blackberry extract in phenolic content (38.08 mg gallic acid equivalent/g dry weight [DW]), flavonoids (14.58 mg quercetin equivalent/g DW), flavonols (6.95 mg rutin equivalent/g DW), and anthocyanins (7.73 mg/kg DW), underlining the fruit’s potent antioxidant activity. Furthermore, blackberries display exceptional ferric-reduction and metal-chelating capabilities, with 20.53 mg FeSO4/g and 182.12 mg Fe2+/g DW, respectively. Remarkably, blackberries also exhibit a remarkable ability to inhibit amylase activity (76.01%). These findings open up exciting prospects for utilizing blackberry fruit as a natural and potent source of phytochemicals and antioxidants in the food and pharmaceutical industries, promising transformative applications in health and well-being.
这项开创性的研究探索了黑莓未开发的潜力,黑莓是蔷薇科红莓属的一员,并揭示了它们非凡的健康和药用特性。与之前在其他地区进行的研究不同,本研究特别关注伊拉克北部Koisinjaq和Erbil村庄黑莓果实的植物化学成分、色谱分离和抗氧化活性。该研究揭示了通过柱层析获得的七个不同的部分,其中部分2和3,5分别含有对香豆酸和芦丁,而部分2还含有绿原酸。分析结果显示,黑莓甲醇提取物的酚类含量(38.08 mg没食子酸当量/g干重[DW])、类黄酮(14.58 mg槲皮素当量/g DW)、类黄酮醇(6.95 mg芦丁当量/g DW)和花青素(7.73 mg/kg DW)丰富,表明黑莓果实具有强大的抗氧化活性。此外,黑莓显示出优异的铁还原和金属螯合能力,分别为20.53 mg FeSO4/g和182.12 mg Fe2+/g DW。值得注意的是,黑莓还表现出显著的淀粉酶活性抑制能力(76.01%)。这些发现开辟了令人兴奋的前景,将黑莓果实作为食品和制药工业中植物化学物质和抗氧化剂的天然有效来源,有望在健康和福祉方面实现革命性的应用。
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引用次数: 0
A Compact Negative Group Delay Microstrip Diplexer with Low Losses for 5G Applications 一种用于5G应用的低损耗紧凑型负群延迟微带双工器
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-08-25 DOI: 10.14500/aro.11237
Leila Nouri, S. Yahya, A. Rezaei, F. Hazzazi, B.N. Nhu
Microstrip Diplexers play an important role in modern wireless communication systems. In this paper, a novel compact microstrip diplexer based on spiral cells is presented. The proposed resonator primarily consists of two spiral thin lines connected to a pair of coupled lines. This novel resonator is analyzed mathematically to find its behavior and tune the dimensions of the final layout easily. Using the analyzed resonator, two bandpass filters (BPFs) are designed. Then, a novel high-performance microstrip diplexer is obtained by designing and integrating these two BPFs. The center frequencies of the first and second channels of the proposed diplexer are 1.86 GHz and 4.62 GHz, respectively. The proposed diplexer boasts a remarkably small size of 0.004 λg2 and features flat channels with low insertion losses of only 0.048 dB and 0.065 dB for the first and second channels, respectively. The maximum group delays of S21 and S31 are 0.31 ns, 0.86 ns, respectively, which are good values for a modern communication system. Meanwhile, inside its passbands for some frequency ranges, its group delays are negative. Thus, using this diplexer can decrease the signal dispersion. The 1st and 2nd passbands are wide with 47.3% and 47.1% fractional bandwidths (FBW), respectively. Therefore, this diplexer can be easily and successfully used in designing high-performance RF communication systems.
微带双工器在现代无线通信系统中起着重要的作用。提出了一种基于螺旋单元的小型微带双工器。所提出的谐振器主要由连接到一对耦合线的两条螺旋细线组成。对这种新型谐振器进行了数学分析,以找到其行为并轻松调整最终布局的尺寸。利用所分析的谐振腔,设计了两个带通滤波器。然后,通过对这两种bpf的设计和集成,得到了一种新型的高性能微带双工器。所提出的双工器第一和第二通道的中心频率分别为1.86 GHz和4.62 GHz。所提出的双工器具有0.004 λg2的非常小的尺寸,并且具有平坦的通道,第一和第二通道的插入损耗分别仅为0.048 dB和0.065 dB。S21和S31的最大群延迟分别为0.31 ns和0.86 ns,这对于现代通信系统来说是很好的值。同时,在某些频率范围内,其群时延为负。因此,使用这种双工器可以降低信号的色散。第1和第2通带较宽,分别为47.3%和47.1%分数带宽(FBW)。因此,该双工器可以方便、成功地用于设计高性能射频通信系统。
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引用次数: 1
Screening of Aflatoxin Production by Aspergillus flavus Isolates from Petroleum-contaminated Soil 石油污染土壤中黄曲霉分离株产黄曲霉毒素的筛选
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-08-25 DOI: 10.14500/aro.11144
Sawan M. Mirkhan, T. Omar
Fungi are eukaryotic, heterogeneous, unicellular to filamentous, spore-bearing, and chemoorganotrophic organisms which lack chlorophyll. This present study was carried out to isolate and identify fungi from petroleum-contaminated soil. Several fungal genera which included Rhizopus spp., Mucor spp., Penicillium spp., Rhizoctonia spp., Aspergillus spp., Alternaria spp., and Cladosporiumspp. were isolated using potatoes dextrose agar, Czapek-Dox Agar, and Aspergillus flavus Differentiation Agar culture media that comparable with co-amoxiclav (1g) and chloramphenicol to prevent the growth of any bacteria. The direct plate and serial dilution agar plate methods were used for the isolation of fungi. Based on results, Aspergillusand Mucor spp. were the most predominant genera and had the highest number of colonies in the soil samples. In this investigation, seven out of 27 soil samples were morphologically (macroscopically and microscopically) identified, such as A. flavus. Aflatoxigenicity of A. flavus was detected using characteristics in Aspergillus differentiation agar and colony fluorescence on exposure to ultraviolet light. Moreover, molecular approaches were used for the detection of aflatoxigenic of the A. flavus isolates. Three structural (aflD, aflO, and aflP) and one regulatory (aflR) gene of the aflatoxin gene cluster of A. flavus were targeted for amplification by the polymerase chain reaction method. The aflatoxigenic of all six A. flavus isolates was detected molecularly which contained two structural (aflD, aflP)genes out of three structural genes, while there was no specific amplification of the aflO gene in the fourth, fifth, and sixth A. flavus which issimilar to the aflR gene in the first and second A. flavus.
真菌是真核生物,异质性的,单细胞到丝状的,带孢子的,缺乏叶绿素的化学有机营养生物。本文对石油污染土壤中真菌的分离鉴定进行了研究。真菌属包括根霉属、毛霉属、青霉属、根丝胞菌属、曲霉属、互交菌属和枝孢子菌属。使用马铃薯葡萄糖琼脂、Czapek-Dox琼脂和黄曲霉分化琼脂培养基进行分离,培养基与共阿莫昔酸(1g)和氯霉素相当,以防止任何细菌的生长。采用直接平板法和连续稀释琼脂平板法分离真菌。结果表明,曲霉和毛霉属是土壤样品中最占优势的属,菌落数量最多。在本次调查中,27份土壤样品中有7份在形态学上(宏观和微观)得到鉴定,如黄芽孢杆菌。利用紫外光照射下曲霉分化琼脂特性和菌落荧光特性检测黄曲霉的致黄曲霉性。此外,还采用分子方法对黄曲霉分离株的黄曲霉毒素进行了检测。采用聚合酶链反应法扩增黄曲霉毒素基因簇的3个结构基因(aflD、aflO和aflP)和1个调控基因(aflR)。6株黄曲霉分离株均含有3个结构基因中的2个结构基因(aflD、aflP),而在第4、5、6株黄曲霉中均未发现aflO基因特异性扩增,与第1、2株黄曲霉的aflR基因相似。
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