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2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)最新文献

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Structural and electrical properties of Zinc sulfide nanoparticles 硫化锌纳米颗粒的结构和电学性质
M. Ahmad, K. Rasool, Z. Imran, M. Rafiq, M. Hasan
Zinc sulfide (ZnS) nanoparticles were synthesized using chemical co-precipitation method. The structural and morphological properties of these particles were studied by X-ray diffraction (XRD) and Scanning electron microscopy (SEM). The crystallite sizes calculated from XRD patterns were 2.8nm and 29nm of as prepared sphalerite and annealed wurtzite ZnS particles respectively. UV-visible absorption spectroscopy was used to calculate absorption edges which were found at 211nm for as prepared and 262 nm for annealed ZnS nanoparticles. These absorption edges were shifted towards lower wavelengths compared to bulk ZnS (337nm). The impedance analysis showed that electrical resistance of annealed sample is decreased as compared to as prepared sample.
采用化学共沉淀法合成了硫化锌纳米颗粒。利用x射线衍射(XRD)和扫描电镜(SEM)研究了这些颗粒的结构和形态特性。通过XRD谱图计算,制备的闪锌矿和退火的纤锌矿ZnS颗粒的晶粒尺寸分别为2.8nm和29nm。利用紫外可见吸收光谱计算了纳米ZnS的吸收边缘,制备的纳米ZnS在211nm处,退火的纳米ZnS在262 nm处。与体ZnS (337nm)相比,这些吸收边向较低波长移动。阻抗分析表明,退火后样品的电阻比制备后样品减小。
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引用次数: 2
Determining suitable wavelet filters for visual sensor networks 确定适合视觉传感器网络的小波滤波器
Brahim Hadjou, A. Mammeri, A. Khoumsi
Visual sensor networks (VSN) require strict constraints on energy consumption. So, low power wavelet-based coder (WBC) is becoming crucial in VSN design. This makes more difficult the determination of appropriate wavelets. An appropriate wavelet is a wavelet that consumes few energy during image processing while permitting an acceptable quality of the reconstructed image at the reception. In this paper, we make a comparative study between DWT transforms because DWT has several advantages. We consider two known ways of implementing DWT: the classical convolutional-based wavelets and the relatively new lifting-based wavelets.
视觉传感器网络(VSN)对能耗有严格的要求。因此,基于小波的低功率编码器(WBC)在VSN设计中变得至关重要。这使得确定合适的小波变得更加困难。适当的小波是在图像处理过程中消耗很少能量的小波,同时在接收处允许重构图像的可接受质量。在本文中,我们对DWT变换进行了比较研究,因为DWT有很多优点。我们考虑了两种已知的实现DWT的方法:经典的基于卷积的小波和相对较新的基于提升的小波。
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引用次数: 4
Design of energy efficient low power PV refrigeration system 节能低功率光伏制冷系统的设计
A. Fatehmulla, Abdullah S. Alshammari, A. Al-Dhafiri, A. Al-Bassam
Stand-alone PV systems have shown to be reliable and cost effective for cooling & refrigeration and have attracted the users. For a specific application with an estimated requirement of cooling, low power refrigeration system using PV modules (2 modules each of 36 solar cells) has been designed, fabricated and developed. In this paper, results of the I-V characteristics for the solar panels used have been presented and discussed. Charging and discharging processes for the battery including the voltage as a function of specific gravity and time have been carried out. All the results are significantly encouraging and hence test results of our system using the charge controller and DC powered refrigerator are presented. The paper also deals with our experiences encountered including the successful operation of the refrigeration system during off the sunshine hours continuously for 6 hours. The calculations of the specific cooling costs show the promising economic effectiveness and reliability of the designed PV refrigeration system. Keeping in view of the technical performance and economic parameter, it demonstrates that this small-scale technology can contribute to solving problems of cooling like small area refrigeration including the transportable and small cold storage container with integrated PV energy supply systems. These systems can be erected on or around a vehicle to obtain the cooling needs while on drives including picnics or especially in remote desert areas.
独立的光伏系统已被证明是可靠的和具有成本效益的冷却和制冷,并吸引了用户。针对某一特定应用的制冷需求,设计、制造和开发了采用光伏组件(每36块太阳能电池2块)的低功率制冷系统。本文介绍并讨论了太阳能电池板的I-V特性。电池的充电和放电过程,包括电压作为比重和时间的函数进行了。实验结果令人鼓舞,并给出了使用充电控制器和直流电冰箱的系统测试结果。本文还介绍了制冷系统在无日照时连续运行6小时的成功经验。计算结果表明,所设计的光伏制冷系统具有良好的经济效益和可靠性。从技术性能和经济参数两方面分析,表明该小型制冷技术可以解决集成光伏供电系统的可移动小型冷库等小区域制冷问题。这些系统可以安装在车辆上或周围,以获得在驾驶时的冷却需求,包括野餐或特别是在偏远的沙漠地区。
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引用次数: 7
Fluence and photobleaching effects of mTHPC mTHPC的通量和光漂白效果
M. Atif
The current study relates to the response of mTHPC to exposure using femtosecond duration laser pulses. Experiments using a Ti: sapphire laser delivering ∼130 fs pulses at a wavelength of ∼ 800 nm show that fluorescence can be excited in this photosensitiser, even though the photon energy is less than the energy of the fluorescing state. The fluorescence amplitude is found to exhibit an irradiance dependence of the form In where n ≈ 2, which is consistent with two-photon excitation. Also the effect of photobleaching was studied using one and two photon excitation.
目前的研究涉及使用飞秒持续时间激光脉冲照射mTHPC的响应。使用Ti:蓝宝石激光器在~ 800 nm波长下提供~ 130 fs脉冲的实验表明,即使光子能量小于荧光状态的能量,荧光也可以在这种光敏剂中被激发。发现荧光振幅表现出与辐照度相关的形式In,其中n≈2,这与双光子激发一致。并研究了单光子和双光子激发下的光漂白效果。
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引用次数: 0
Building energy efficient LR-PON for desert terrain of Saudi Arabia 沙特阿拉伯沙漠地形建筑节能LR-PON
Mohammad Siraj, A. Fatehmulla, S. Alshebeili, K. A. Bakar
With the increase of bandwidth demands, an increasing concern prevails among researchers towards energy consumption in next generation access networks. Attempts have been made by researchers with an overview of techniques and architectures for energy consumption minimization in core networks. Growing concern equally exists essentially to reduce Green House Gases (GHG) emissions from computers and network equipments. In the present paper, we focus on renewable energy utilization at access level as well with a view to build energy efficient long range passive optical networks (LR-PON) for desert terrain of Saudi Arabia. In this paper we have presented LR-PON model between Riyadh and Al-Kharj with an admission control algorithm for efficient performance of LR-PON. Also, in this paper we have shown how to reduce network complexities and provide a cost effective solution by greening the network at the access level by using solar energy which is renewable and clean.
随着带宽需求的增加,下一代接入网的能耗问题越来越受到研究人员的关注。研究人员对核心网络中能耗最小化的技术和架构进行了概述。减少计算机和网络设备的温室气体(GHG)排放也同样受到越来越多的关注。在本文中,我们将重点放在可再生能源的利用上,以及在沙特阿拉伯沙漠地形建立节能的远程无源光网络(LR-PON)。本文提出了Riyadh和Al-Kharj之间的LR-PON模型,并提出了一种允许控制算法,以提高LR-PON的效率。此外,在本文中,我们展示了如何通过使用可再生和清洁的太阳能,在接入层面绿化网络,从而降低网络的复杂性,并提供具有成本效益的解决方案。
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引用次数: 0
Electrospun TiO2 nanorods assembly sensitized by mercaptosuccinic acid-capped CdS quantum dots for solar cells: Subtitle as needed (paper subtitle) 太阳能电池用巯基琥珀酸覆盖CdS量子点致敏的电纺丝TiO2纳米棒组件:根据需要提供副标题(论文副标题)
A. S. Nair, Yang Shengyuan, Zhu Peining, E. N. Kumar, P. Archana, V. J. Babu, S. Ramakrishna
CdS quantum dots (QDs) capped with mercaptosuccinic acid (MSA) as the surface passivating ligand were anchored to electrospun TiO2 nanorod surfaces using the terminal carboxylic acid groups present on MSA. The as-synthesized materials and the dye-sensitized solar cells were characterized by spectroscopy, microscopy and photocurrent measurements, respectively. Best solar cells fabricated by the method showed an efficiency of 0.07%. We believe that the simple, one-pot fabrication of the QDs and their assembly into solar cells are significant steps in QD-sensitized solar cell research.
以巯基琥珀酸(MSA)为表面钝化配体的CdS量子点(QDs)利用MSA上的末端羧基固定在静电纺丝TiO2纳米棒表面。通过光谱学、显微镜和光电流测试分别对合成材料和染料敏化太阳能电池进行了表征。用该方法制备的最佳太阳能电池的效率为0.07%。我们认为,简单的单锅制造量子点并将其组装成太阳能电池是量子点敏化太阳能电池研究的重要步骤。
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引用次数: 0
New erbium doped fiber laser amplifier 新型掺铒光纤激光放大器
B. Bouzid
A new configuration of laser and amplifier is constructed and investigated. This configuration is called erbium doped fiber laser amplifier (EDFLA) where both the laser and amplifier are included in one configuration. The new configuration is utilized as optical amplifier, laser source, and ON/OFF optical tool. A surprising characteristic of the configuration is remarked when the lasing is ON the absorption and amplification are abolished.
构造并研究了一种新的激光器和放大器结构。这种结构称为掺铒光纤激光放大器(EDFLA),其中激光器和放大器都包含在一个结构中。这种新型结构可以用作光放大器、激光源和开/关光学工具。当激光处于开启状态时,该结构的一个惊人特性是吸收和放大被消除。
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引用次数: 1
PID controllers design for a power plant using Bacteria Foraging Algorithm 基于细菌觅食算法的电厂PID控制器设计
A. Bensenouci
This paper provides the design for two PID controllers, one for the terminal voltage and the other for the electric power. Both controllers are designed to control a sample power system that comprises a synchronous generator connected to a large network via a step-up transformer and a transmission line. The generator is equipped with two decoupled control-loops, namely, the speed/power (governor) and voltage (exciter) controllers. The gains setting of both PIDs are found using Bacteria Forging Algorithm (BFA). PID is considered because of its robustness, simple structure and easy implementation. It is also preferred in plants of higher order that cannot be reduced to lower ones. To show the effectiveness of the design, divers tests, namely, step/tracking in the control variables, and variation in plant parameters, are applied. From the simulation, the results are very encouraging to pursue further this trend.
本文给出了两个PID控制器的设计,一个用于终端电压,另一个用于电力。这两种控制器都设计用于控制一个示例电力系统,该系统包括一个同步发电机,通过升压变压器和传输线连接到一个大型网络。发电机配备了两个解耦控制回路,即速度/功率(调速器)和电压(励磁器)控制器。利用细菌锻造算法(BFA)确定了两种pid的增益设置。PID具有鲁棒性好、结构简单、易于实现等优点。它也适用于不能退化为低级植物的高级植物。为了显示设计的有效性,应用了多种测试,即控制变量的步进/跟踪和工厂参数的变化。从模拟结果来看,这一趋势的进一步发展是非常令人鼓舞的。
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引用次数: 11
Highly reliable analog filter design using analog voting 采用模拟投票的高可靠模拟滤波器设计
S. Askari, M. Nourani
N-Modular Redundancy (NMR) is the most commonly used failure mitigation technique, in which a voting unit is used to vote out the wrong path/data. The voter is, therefore, vital for nanoscale analog and digital circuits in which high defect rate is expected. In this paper, we propose a redundancy based fault-tolerant methodology to design fault tolerant analog filters. The key contribution of our work is an innovative mean voter which is very fast, inexpensive and linearly scalable with respect to the redundancy factor. For the proof of concept, we designed a 4th order high frequency Gm-C filter and a 5th order Opamp-RC filter and reported the circuits reliability.
n模冗余(NMR)是最常用的故障缓解技术,其中使用投票单元投票排除错误的路径/数据。因此,在高缺陷率的纳米级模拟和数字电路中,选民是至关重要的。本文提出了一种基于冗余的容错方法来设计容错模拟滤波器。我们工作的关键贡献是一种创新的平均选民,它非常快速,廉价并且在冗余系数方面线性可扩展。为了概念验证,我们设计了一个4阶高频Gm-C滤波器和一个5阶Opamp-RC滤波器,并报告了电路的可靠性。
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引用次数: 4
Morphological dependance of charge transport in nanostructured ZnO-based dye sensitized solar cells 纳米zno基染料敏化太阳能电池中电荷输运的形态依赖性
N. Elumalai, Mein Jin Tan, Jia Xing Lee, S. Dolmanan, Karen Ke Lin, Liu Bin, A. Nair, Vijila Chellappan, S. Ramakrishna
Zinc oxide (ZnO) photoanodes of two different morphologies — nanorods and nanosheets are used to fabricate dye sensitised solar cells in order to study the influence of morphology on device performance. Characteristics such as dye loading capacity and light scattering ability of the photoanodes depend on the morphology to a large extent. This leads to change in the electron transport properties, which in turn affects power conversion efficiency. Here we report the difference in the charge transport properties of these morphologies evaluated using the time resolved photocurrent measurements. The photocurrent transients for ZnO nano-rod film exhibited dual peak behaviour, whereas transients for ZnO nano-sheet film exhibited only one peak as the time delayed second peak corresponding to slow electron diffusion was totally suppressed. The transient photocurrent decay also indicates that the charge transport rate is much faster in the ZnO nano-sheets, which allows the efficient charge collection over much larger thickness compared to other ZnO nano-rod film. The power conversion efficiency (PCE) of the devices was found to be 1.6% and 1.5 % for the ZnO-nano-rod and nano-sheet based dye sensitized solar cells respectively. A comparative study is performed and the photovoltaic parameters obtained in each case are correlated with the photocurrent transients enabling better understanding of the impact of morphology.
采用纳米棒和纳米片两种不同形貌的氧化锌(ZnO)光阳极制备染料敏化太阳能电池,研究其形貌对器件性能的影响。光阳极的载染能力和光散射能力等特性在很大程度上取决于其形貌。这会导致电子传递性质的改变,进而影响功率转换效率。在这里,我们报告了使用时间分辨光电流测量评估这些形态的电荷输运性质的差异。ZnO纳米棒薄膜的光电流瞬态表现为双峰行为,而ZnO纳米片薄膜的光电流瞬态表现为单峰行为,因为时间延迟的第二个峰对应的慢电子扩散被完全抑制。瞬态光电流衰减还表明,与其他ZnO纳米棒薄膜相比,ZnO纳米片中的电荷传输速率要快得多,这使得在更大的厚度上能够有效地收集电荷。该器件的功率转换效率(PCE)分别为1.6%和1.5%,分别用于zno纳米棒和纳米片染料敏化太阳能电池。进行了比较研究,并将每种情况下获得的光伏参数与光电流瞬态相关联,从而更好地理解形貌的影响。
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引用次数: 0
期刊
2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)
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