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

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S-C bands broadband envelop detector design S-C波段宽带包络探测器设计
S. Alamri, A. AlAmoudi
This paper proposes the design, fabrication, characterization and measurement of an S-C band broadband detector. A brief theoretical outline of detectors and detector devices is presented. The commercially available GaAs packaged detector diode SOD-323 was adapted to build an unamplified detector. A broadband microchip impedance matching network procedure was developed, characterised and used to provide the broadband design for the detector. The measurements show a close agreement between the simulated and measured results. The bandwidth obtained was better than 5 GHz or 100% for 5 GHz frequency centre from 2 GHz to 8 GHz; minimum voltage sensitivity 200 mV/mW over 2 GHz to 8 GHz was achieved and the peak value was more than 1130 mV/mW at 3 GHz.
本文介绍了一种S-C波段宽带探测器的设计、制作、表征和测量。简要介绍了探测器和探测器装置的理论概况。采用市售的砷化镓封装的探测器二极管SOD-323来构建非放大的探测器。开发了一种宽带微芯片阻抗匹配网络程序,对其进行了表征,并用于为探测器提供宽带设计。结果表明,模拟结果与实测结果吻合较好。从2 GHz到8 GHz,获得的带宽优于5 GHz或5 GHz频率中心100%;在2 GHz至8 GHz范围内,最小电压灵敏度达到200 mV/mW,在3 GHz范围内峰值超过1130 mV/mW。
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引用次数: 4
An overview of laser technology in dentistry 牙科激光技术综述
A. Umer, Afsheen Umer
Laser technology was introduced in dentistry with a novel idea of overcoming some of the problems due to traditional treatment methods. After its first use in 1960s, laser technology has found its place in different aspects of dentistry field. The aim of this review is to explain laser applications and compare different types of lasers along with their advantages and disadvantages. A computer based search was done to study 135 articles in seven journals. Laser inherent properties make it the treatment of choice is some cases. Its main achievement is overcoming patient fear associated with conservative dental treatment. On the downside, cost is a big limiting factor in its use. Since the discovery of laser, its research has given different improved laser types, specialized for different targets, like new wavelength bands, maximum peak pulse energy, output power, minimum cost and maximum efficiency. Based on its development and its improved efficiency, laser technology application may revolutionize traditional dental treatment methods.
激光技术被引入到牙科中,以克服传统治疗方法所带来的一些问题。激光技术自20世纪60年代首次使用以来,已在牙科领域的各个方面找到了自己的位置。本综述的目的是解释激光的应用,并比较不同类型的激光器及其优缺点。通过计算机搜索,研究了7种期刊上的135篇文章。激光固有的特性使其成为某些情况下的治疗选择。它的主要成就是克服了患者对保守牙科治疗的恐惧。缺点是,成本是其使用的一个很大的限制因素。自激光被发现以来,其研究已经给出了不同的改进类型的激光,专门针对不同的目标,如新的波长波段,最大峰值脉冲能量,输出功率,最低成本和最高效率。基于激光技术的发展和效率的提高,激光技术的应用可能会彻底改变传统的牙科治疗方法。
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引用次数: 3
Absorption and transport enhancement by Ag nanoparticle plasmonics for organic optoelectronics 银纳米粒子等离子体在有机光电子学中的吸收和输运增强
Mei Xue, Huajun Shen, Jinfeng Zhu, Seong-ku Kim, Lu Li, Zhibin Yu, Q. Pei, Kang L. Wang, H. Qasem, A. Alzaben, H. Enaya, Zaid S. Al Otaibi
The organic films such as P3HT/PCBM incorporating Ag metal nanoparticles are fabricated and experimentally characterized. Due to the excited surface plasma induced by Ag metal nanoparticles, the absorption of the active organic material layer is increased by around 30%. The broadened absorption spectrum to the 260–650nm wavelength range is also observed from our measurements because of the enhanced scattering cross section by Ag metal nanoparticles. Furthermore, by incorporating Ag nanoparticles into the active layer, the mobility have also been improved. Finite Difference Time Domain (FDTD) simulations confirm the increase in transmission of electromagnetic radiation at visible wavelength. The hopping model is proposed to explain the transport mechanism for the device operations. These observations suggest a variety of approaches for improving the performance of general organic optoelectronic devices.
制备了含银金属纳米粒子的P3HT/PCBM有机薄膜,并对其进行了实验表征。由于银金属纳米颗粒诱导的表面等离子体的激发,活性有机材料层的吸收率提高了30%左右。由于银金属纳米粒子的散射截面增强,我们的测量还观察到260-650nm波长范围内的吸收光谱被拓宽。此外,通过在活性层中加入银纳米粒子,也提高了其迁移率。时域有限差分(FDTD)仿真证实了电磁辐射在可见光波段的传输增加。提出了跳变模型来解释设备操作的传输机制。这些观察结果为提高一般有机光电器件的性能提供了多种方法。
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引用次数: 1
Fiber optic sensor-based concrete structural health monitoring 基于光纤传感器的混凝土结构健康监测
M. Afzal, Shahid Kabir, O. Sidek
Fiber optic sensors are being extensively developed and utilized in various fields, compared to conventional sensing technologies, due to their exclusive properties, such as complete immunity to electromagnetic interference, capability of functioning in hostile surroundings, elevated sensitivity and user-friendliness. The unique characteristics of fiber optic sensors can provide more accurate and precise detection of crack damage in concrete structures, the deterioration of which is one of the major growing problems worldwide. This paper provides a comprehensive critical review and comparison of various approaches used in detecting crack damage using fiber optic sensors. A separate section is devoted to highlight the areas where further improvements are required. The compatibility and sustainability of the latest fiber optic sensors in detecting concrete damage are also studied and evaluated in this paper.
与传统传感技术相比,光纤传感器由于其独特的特性,如完全不受电磁干扰、能够在恶劣环境中工作、灵敏度高、用户友好等,正在广泛发展和应用于各个领域。光纤传感器的独特特性可以为混凝土结构的裂缝损伤提供更准确、更精确的检测,混凝土结构的恶化是世界范围内日益突出的主要问题之一。本文对利用光纤传感器检测裂纹损伤的各种方法进行了全面的评述和比较。一个单独的部分专门强调需要进一步改进的领域。本文还对新型光纤传感器在混凝土损伤检测中的兼容性和可持续性进行了研究和评价。
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引用次数: 15
Dye-sensitized solar cells based on in situ sensitized of nitrogen doped TiO2 基于氮掺杂TiO2原位敏化的染料敏化太阳能电池
K. Cahyorini, K. Indriana, Narsito
Dye-sensitized solar cells (DSSCs) are being a potential technology for application in solar energy and photovoltaic processes. Its light harvesting and photocurrent generation are highly dependent on the nanostructured semiconductor film and the mode of dye adsorption. The N-doped TiO2 with mesoporous structure, which synthesized through one step templating sol gel method using amine group containing surfactant, was used as semiconductor material. The ruthenium polypirydine complex that contain carboxylic anchoring group was used as dye sensitizer. The dye adsorption process has been performed in situ, stepwise, and directly on the surface of the N-doped TiO2 film. FTIR spectrophotometer is used to study the surface interactions of Ru complex with N-doped TiO2 surface. The result showed that the coordination of Ru-complex on N-doped TiO2 film occurs mainly by the contribution of unidentate (i.e., ester-like linkage) and partially by bidentate linkage. The absorption spectrum, IPCE and I-V curve were used to study the efficiency of in situ adsorption process in DSSCs, providing fill factor (ff) 64 % IPCE and overall DSSCs (77) efficiency 6.5%.
染料敏化太阳能电池(DSSCs)是一种极具潜力的太阳能和光伏发电技术。它的光收集和光电流的产生高度依赖于纳米结构半导体薄膜和染料吸附方式。采用含胺基表面活性剂一步模板溶胶凝胶法制备了具有介孔结构的n掺杂TiO2作为半导体材料。采用含羧基锚定基团的多吡啶钌配合物作为染料增敏剂。染料的原位、分步、直接吸附在n掺杂TiO2薄膜表面。用FTIR分光光度计研究了Ru配合物与n掺杂TiO2表面的相互作用。结果表明,钌配合物在n掺杂TiO2薄膜上的配位主要是通过异位键(即酯类键)的贡献,部分是通过双齿键的贡献。利用吸收光谱、IPCE和I-V曲线研究了DSSCs的原位吸附效率,获得了填充系数(ff)为64%的IPCE和总DSSCs(77)效率6.5%的结果。
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引用次数: 1
Efficient load sharing routing algorithm to increase lifetime of Wireless Sensor Networks 提高无线传感器网络寿命的有效负载分担路由算法
Asjad Amin, Waqar Mehbob, Arslan Haider Ranjha, Hasnain Abbas, Nadeem Abbas, Waqas Anjum
Wireless Sensor Networks (WSN) are low power networks which have many small nodes. The nodes are low power sensors interconnected to each other to receive and transmit data from source to sink. By the transferring of data, the power of these nodes reduces and eventually the system dies. In this paper we introduce an efficient load sharing routing technique to increase the life time of all the nodes in a way to get maximum efficiency from the network. The routing algorithms such as link state which are used for wireless sensor networks prefer to choose a low cost path to decrease the transmission time but they do not consider the power of nodes for transmission which sometimes result in reduction of a lifetime of a network. We modify the previous method by saving the power of each node. A critical power is defined for a network and a node with power less than critical value is operated in power saving mode and is used only if there is no other substitute path available. A node in power saving mode set the cost of all the connected links to a very large value. When link state algorithm is applied on modified network, it is highly unlikely to get a low cost path with inclusion of such node unless a destination has only one path that includes this low power node. A computer simulation is performed to evaluate the performance of proposed algorithm. Our result clearly indicates an increase in lifetime of a network.
无线传感器网络(WSN)是一种具有许多小节点的低功耗网络。节点是相互连接的低功率传感器,从源到接收器接收和传输数据。通过传输数据,这些节点的功率降低,最终导致系统死亡。本文介绍了一种有效的负载共享路由技术,以增加所有节点的生存时间,从而获得最大的网络效率。用于无线传感器网络的链路状态等路由算法倾向于选择低成本路径以减少传输时间,但它们没有考虑节点的传输功率,这有时会导致网络寿命的缩短。我们修改了之前的方法,节省了每个节点的功率。网络中定义了一个临界功率,当功率小于临界值时,节点将以节电模式运行,且只有在没有其他替代路径时才会使用。节点处于省电模式时,将所有已连接链路的开销设置得非常大。当在修改后的网络上应用链路状态算法时,除非目的地只有一条包含该低功耗节点的路径,否则得到包含该低功耗节点的低开销路径的可能性很小。通过计算机仿真对所提算法的性能进行了评价。我们的结果清楚地表明,网络的生命周期增加了。
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引用次数: 10
Resistance strain sensors based on quasi-one-dimension Ph3MeP(TCNQ)2 crystals 基于准一维Ph3MeP(TCNQ)2晶体的电阻应变传感器
M. Saleem, K. Karimov, M. Saeed
In this paper, the experimental results on the investigation of electric properties of organic semiconductor resistance strain sensors based on quasi-one dimensional ion-radical salts of tetracyanoquinodimethane and three phenyl methyl phosphonium [Ph3MeP(TCNQ)2] are described. It was observed that the sensitivity of the resistance strain sensors based on twinned crystals is significantly larger than that of uniform crystals.
本文描述了基于准一维四氰喹诺二甲烷和三苯基甲基磷离子基盐[Ph3MeP(TCNQ)2]的有机半导体电阻应变传感器电性能研究的实验结果。结果表明,基于双晶的电阻应变传感器的灵敏度明显大于均匀晶的灵敏度。
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引用次数: 0
Multi states electromechanical switch for energy efficient parallel data processing 多状态机电开关,用于高效节能的并行数据处理
Hussam A. Kloub, Casey Smith, M. Hussain
We present a design, simulation results and fabrication of electromechanical switches enabling parallel data processing and multi functionality. The device is applied in logic gates AND, NOR, XNOR, and Flip-Flops. The device footprint size is 2μm by 0.5μm, and has a pull-in voltage of 5.15V which is verified by FEM simulation.
我们提出了一种能够并行数据处理和多功能的机电开关的设计、仿真结果和制造方法。该器件适用于逻辑门与、NOR、XNOR和触发器。器件占地尺寸为2μm × 0.5μm,拉入电压为5.15V,并通过有限元仿真验证。
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引用次数: 4
Multi user detection for SDMA OFDM communication systems SDMA OFDM通信系统的多用户检测
Mohammed Alansi, I. Elshafiey, A. Al-Sanie
This paper investigates the implementation scenario of Space Division Multiple Access(SDMA) which is a notable application of Multiple Input Multiple Output(MIMO) system. SDMA is one of the most promising techniques aiming at solving the capacity problem of wireless communication systems and achieving higher spectral efficiency, depending on multiplexing signals based on their spatial signature. This paper presents of combining SDMA combined with the Orthogonal Frequency Division Multiplexing (OFDM). Various SDMA techniques are investigated including linear detection schemes, minimum mean square error, ordered successive cancellation, and maximum likelihood methods. Promising results are obtained to enhance spectral efficiency on the expense of computational complexity which needs to be addressed.
本文研究了多输入多输出(MIMO)系统的重要应用——空分多址(SDMA)的实现方案。SDMA是解决无线通信系统容量问题和实现更高频谱效率的最有前途的技术之一,它依靠基于空间特征的多路复用信号。本文介绍了SDMA与正交频分复用(OFDM)技术的结合。研究了各种SDMA技术,包括线性检测方案,最小均方误差,有序逐次消去和最大似然方法。在提高频谱效率的同时,也解决了计算复杂度的问题。
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引用次数: 9
Adaptive UWB-OFDM Synthetic Aperture Radar 自适应UWB-OFDM合成孔径雷达
Md Anowar Hossain, I. Elshafiey, M. Alkanhal, A. Mabrouk
This paper presents an empirical study of high resolution potentially jamming-resistant Synthetic Aperture Radar (SAR) system based on UWB-OFDM architecture. The Range-Doppler Algorithm (RDA) was used to construct a high resolution SAR image for simulation purpose. Suitable waveforms to achieve high resolution SAR imaging are proposed for both friendly and hostile environments. The proposed waveforms were tested for a point scatterer and for full 2-D SAR image construction. Simulation results demonstrate the benefits of using UWB-OFDM waveforms for SAR system, such as dynamic spectrum allocation, antijamming potential through pulse diversity-while having a potential to produce high resolution target images. The use of UWB-OFDM waveform for SAR system proves useful for high resolution image data collection for civilian purposes and provides significant anti-jamming capabilities for military purposes.
本文对基于UWB-OFDM结构的高分辨率抗潜在干扰合成孔径雷达(SAR)系统进行了实证研究。采用距离多普勒算法(RDA)构建高分辨率SAR图像进行仿真。提出了在友好环境和敌对环境下实现高分辨率SAR成像的合适波形。对所提出的波形进行了点散射和全二维SAR图像构建的测试。仿真结果证明了在SAR系统中使用UWB-OFDM波形的优点,如动态频谱分配、通过脉冲分集的抗干扰潜力,同时具有产生高分辨率目标图像的潜力。在SAR系统中使用UWB-OFDM波形被证明对民用目的的高分辨率图像数据收集有用,并为军事目的提供显著的抗干扰能力。
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引用次数: 10
期刊
2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)
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