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2007 ICTON Mediterranean Winter Conference最新文献

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Theoretical study by gaussian of some molecular properties of the benzodiazepine derivatives 用高斯理论研究苯二氮卓类衍生物的一些分子性质
Pub Date : 2007-12-01 DOI: 10.1109/ICTONMW.2007.4446969
S. Abirou, A. El assyry, B. Benali, Z. Lazar, A. Boucetta, M. Massoui, B. Lakhrissi, C. Jarmoumi, D. Mondieig
1,5-benzodiazepin-2,4-dione is not a planar molecule, in which the structure is in three dimensions composed of a six membered phenyl ring condensed with a seven membered heterocyclic (compound 1). We were interested by the molecular properties of these compounds because several publications recently indicated that some benzodiazepine derivatives have been studied because of their biological activity as carcinostatic compounds and were highly effective for the relief of anxiety. They have a lower potential for addiction than many other drugs that were used earlier and are less likely to cause death or serious, lasting harm when taken in overdoses. There are now several dozen benzodiazepine drugs in clinical use worldwide, although use has become less popular because of side effects, including dependence. The various compounds appear to differ primarily in their pharmacokinetics, that is, the speed with which they are taken up and eliminated by the body, rather than in differences in their clinical effects. This pharmacological interest has motivated the search for methods of synthesis of substituted benzodiazepines. Because of this pharmacological interest, and in absence of fundamental spectroscopic data in the literature on these compounds, we considered it useful in this work to discuss some of their molecular properties of potential interest. These last could explore of advantage the reactivity and the mechanisms implying the part of benzodiazepine in the biological systems like those mentioned above. For this purpose, we studied in terms of information by the method of Gaussian the molecular properties of benzodiazepine 1 oneself as well as its four derivatives: the 3-chloro-benzodiazepine 2, the 3-methyl-benzodiazepine 3, the 7-methyle-benzodiazepine 4 and the 7,11-dimethylbenzodiazepine 5.
1,5-苯二氮卓-2,4-二酮不是平面分子,其结构是由六元苯环与七元杂环(化合物1)缩合而成的三维结构。我们对这些化合物的分子性质很感兴趣,因为最近一些出版物表明,一些苯二氮卓衍生物由于其作为抗癌化合物的生物活性而被研究,并且对缓解焦虑非常有效。与以前使用过的许多其他药物相比,它们上瘾的可能性较低,并且在过量服用时不太可能造成死亡或严重、持久的伤害。目前,全世界临床使用的苯二氮卓类药物有几十种,但由于其副作用(包括依赖性),使用已不那么普遍。不同的化合物似乎主要在它们的药代动力学上不同,即它们被人体吸收和消除的速度,而不是在它们的临床效果上的差异。这种药理学上的兴趣促使人们寻找合成取代苯二氮卓类药物的方法。由于这种药理意义,并且在这些化合物的文献中缺乏基本的光谱数据,我们认为在这项工作中讨论它们的一些潜在的分子特性是有用的。这些研究有利于探索苯二氮卓类药物在上述生物系统中的反应性和作用机制。为此,我们利用高斯法研究了苯二氮卓1本身及其衍生物3-氯-苯二氮卓2、3-甲基-苯二氮卓3、7-甲基-苯二氮卓4和7,11-二甲基-苯二氮卓5的分子性质。
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引用次数: 0
Multimedia need more bandwidth - may internet collapse? 多媒体需要更多带宽——互联网会崩溃吗?
Pub Date : 2007-12-01 DOI: 10.1109/ICTONMW.2007.4446985
Z. Kadzielski
Only summary form given. The paper covers new requirements on bandwidths in new multimedia services over IP networks with the mixture of transmission technologies. With the exponentially growing traffic volume current network infrastructure is not designed to fulfill those requirements. Internet may not withstands expectations due to visible bottlenecks in access and switching areas. It is presented how the infrastructure should be changed to overcome those weaknesses. It is shown that the possible solution is optical switching.
只给出摘要形式。本文讨论了混合传输技术在IP网络上的新型多媒体业务对带宽的新要求。随着通信量呈指数级增长,当前的网络基础设施无法满足这些需求。由于接入和交换领域存在明显的瓶颈,互联网可能无法承受预期。介绍了如何改变基础设施以克服这些弱点。结果表明,可能的解决方案是光交换。
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引用次数: 0
Modelling dispersion in photonic crystal and its application in reducing chromatic dispersion 光子晶体色散的建模及其在降低色散中的应用
Pub Date : 2007-12-01 DOI: 10.1109/ICTONMW.2007.4446949
A. Ajengui, M. Ammar, R. Attia, P. Benech, A. Morand
In this work we model the dispersive properties of photonic crystal (PC) modelling. Our final aim is making easier the choice of the appropriate direction when correcting waveguide's dispersion with a PC material. In this case the optical propagation properties are strongly modified by the anisotropy of the photonic crystal. The transmission of a plane wave will depends on the wavelength and its direction. The results are obtained by using numerical tools: Bandsolve of RSoft [1].
本文对光子晶体的色散特性进行了模拟。我们的最终目标是在使用PC材料校正波导色散时更容易选择合适的方向。在这种情况下,光子晶体的各向异性强烈地改变了光的传播特性。平面波的传播取决于波长和方向。利用数值工具RSoft[1]的带宽求解得到了结果。
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引用次数: 0
Adsorption of indigo carmine dye by Mg-Al-CO3 calcined layered double hydroxides Mg-Al-CO3煅烧层状双氧水对靛蓝胭脂红染料的吸附
Pub Date : 2007-12-01 DOI: 10.1109/ICTONMW.2007.4446927
L. El Gaini, M. Lakraimi, E. Sebbar, A. Meghea, M. Bakasse
Adsorption of Indigo Carmine (IC), an anionic dye, from aqueous solution by calcined Mg2-Al-CO3 LDH was investigated in batch mode. The adsorption of IC on CLDH is described by Freundlich isotherm model. Characterization of the CLDHs solids, both fresh and after removal of IC by X-ray diffraction and infrared spectroscopy shows that the IC adsorption on CLDH is enhanced by reconstruction of a matrix hydrotalcite intercalated by the dye. The intercalation of the IC in the layered host structure increase with increasing concentration of the dye in solution and the temperature of heating of LDH. The intercalation of the organic ion was clearly evidenced by the net increase in the basal spacing from 0.762 nm for [Mg2-Al-CO3] to 2.132 nm for the organic derivative.
研究了焙烧Mg2-Al-CO3 LDH对阴离子染料靛蓝胭脂红(IC)的吸附性能。用Freundlich等温模型描述了IC在CLDH上的吸附。用x射线衍射和红外光谱对CLDH固体进行了表征,包括去除IC后的固体和去除IC后的固体,结果表明,通过重建染料插层的基质水滑石,CLDH对IC的吸附增强。随着溶液中染料浓度的增加和LDH加热温度的升高,集成电路在层状主体结构中的嵌入量增加。[Mg2-Al-CO3]的基间距从0.762 nm增加到2.132 nm,清楚地证明了有机离子的插入。
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引用次数: 1
Tailoring Er3+ spectroscopic properties by nanocomposite photonic glasses and confined structures 纳米复合光子玻璃和受限结构裁剪Er3+光谱特性
Pub Date : 2007-12-01 DOI: 10.1109/ICTONMW.2007.4446910
C. Armellini, A. Chiappini, A. Chiasera, M. Ferrari, Y. Jestin, F. Prudenzano, P. Féron, E. Moser, C. Tosello, B. Boulard, C. Duverger, G. Speranza, L. Minati, G. N. Conti, S. Pelli, G. Righini
Paper reports recent advances in optical nanomaterials, planar microcavity, and spherical microresonators. Bottom-up fabrication and optical assessment of Er3+-activated SiO2-HfO2 waveguide glass ceramic is presented. Concerning confined structures, fabrication by radio-frequency sputtering (RFS) technique of an Er3+-activated microcavity with a quality factor of 171 using oxide-based dielectric materials is demonstrated and fabrication and spectroscopic assessment of Er3+-activated silica microspheres is presented.
本文报道了光学纳米材料、平面微腔和球形微谐振器的最新进展。介绍了Er3+活化SiO2-HfO2波导玻璃陶瓷的自底向上制备和光学性能评价。在受限结构方面,采用射频溅射(RFS)技术制备了质量因子为171的Er3+活化微腔,并对Er3+活化二氧化硅微球的制备和光谱评价进行了介绍。
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引用次数: 0
Path selection strategies for OBS networks using topological network information 基于拓扑网络信息的OBS网络路径选择策略
Pub Date : 2007-12-01 DOI: 10.1109/ICTONMW.2007.4446932
A. Barradas, M. Medeiros
Optical Burst Switching (OBS) has been proposed as a cost-effective paradigm for supporting, with adequate flexibility, the increasingly high transmission capacity required by the forthcoming next generation of optical internet networks. However, OBS efficiency can be reduced by resource contention of bursts directed to the same transmission links, leading to burst loss. This paper presents two strategies to minimize this kind of contention on the OBS backbone using only a priori topological network information, thus reducing burst loss probability while avoiding state dissemination protocol penalties. Numerical results, obtained through simulation using a dynamic framework scenario, demonstrate that our approaches are effective in reducing the overall network burst drop probability when compared with the traditionally used shortest path routing.
光突发交换(OBS)已被提出作为一种经济有效的范例,以足够的灵活性支持即将到来的下一代光互联网网络对越来越高的传输容量的要求。然而,OBS的效率可能会因为指向相同传输链路的突发资源争夺而降低,从而导致突发损失。本文提出了两种仅使用先验拓扑网络信息来最小化OBS骨干网上这种争用的策略,从而在减少突发损失概率的同时避免了状态传播协议的惩罚。通过动态框架场景的仿真得到的数值结果表明,与传统的最短路径路由相比,我们的方法有效地降低了整个网络突发丢弃概率。
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引用次数: 2
Prediction of elastic parameters of photoluminescent porous Si 光致发光多孔硅弹性参数的预测
Pub Date : 2007-12-01 DOI: 10.1109/ICTONMW.2007.4446967
A. Doghmane, I. Hadjoub, M. Doghmane, Z. Hadjoub
The discovery of photoluminescence properties of highly porous silicon, PS, has recently attracted considerable research. To enrich the understanding of this material, we carry out an investigation of its elastic properties which are of great importance in any opto-, nano-, micro-device applications. By considering 80%-and 70%-porosity PS layers, we deduced their SAW velocities (longitudinal, VL, and transverse, VT); they were found to be: (VL)80% = 1677 m/s, (VL)70% = 1868 m/s, (VL)80% = 1041 m/s, (VT)70% = 1160 m/s, (VR)80% = 969 m/s and (VR)70% = 1080 m/s. Then, their reflection coefficients and acoustic signatures were calculated, plotted and spectrally analyzed. Hence, the optimal conditions for eventual measurements of these parameters by a scanning acoustic microscope were determined (spherical acoustic lens of 50deg, freon as a coupling liquid and variable operating frequencies: 58 MHz, 142 MHz and 565 MHz).
高多孔硅(PS)的光致发光特性的发现近年来引起了广泛的研究。为了丰富对这种材料的理解,我们对其弹性特性进行了研究,这在任何光、纳米、微器件应用中都是非常重要的。通过考虑孔隙度为80%和70%的PS层,我们推导出了它们的声传导速度(纵向、VL和横向、VT);分别为(VL)80% = 1677 m/s, (VL)70% = 1868 m/s, (VL)80% = 1041 m/s, (VT)70% = 1160 m/s, (VR)80% = 969 m/s, (VR)70% = 1080 m/s。然后计算、绘制和分析了它们的反射系数和声学特征。因此,确定了扫描声学显微镜最终测量这些参数的最佳条件(50度球形声学透镜,氟利昂作为耦合液体,可变工作频率:58 MHz, 142 MHz和565 MHz)。
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引用次数: 5
Secure communications: The infrared alternative 安全通信:红外线替代方案
Pub Date : 2007-12-01 DOI: 10.1109/ICTONMW.2007.4446906
R. Green
Much of the world's high-speed communications travel through optical fibres, and a rapidly-increasing demand for network bandwidth to accommodate both data and voice traffic has developed. There is a bottleneck in the access network to enable delivery of multimedia services to residential and small business customers. Coupled with this is a rapidly-growing demand for mobility via wireless technologies, driven by expansion in the use of PDAs and mobile telephones. The ubiquitous nature of computer terminals in the modern office also means that a wireless network, devoid of the inconvenience and cost of reconfiguring wired systems, is increasingly appealing (communications "anytime, anywhere"). The use of infrared communications through free space, or optical wireless, is very promising, as a means of supporting the high bit rates which will be required by future multimedia services, since it offers potentially large unregulated bandwidths. Recently there has been increased recognition of the advantages of the optical portion of the spectrum when compared to radio as a medium for short-range communication. This, coupled with technological advances such as the Warwick optical antenna, has produced a growth in interest in optical wireless systems for both in indoor and outdoor applications. In particular, optical wireless offers high bandwidth at low-cost, immunity to radio interference, an unregulated spectrum and small components that consume little power. This paper briefly reviews optical wireless, and shows how it is developing and permitting unprecedented free spectrum, secure, immune from the effects of any other RF communications, and internationally and freely available.
世界上大部分高速通信都是通过光纤传输的,而且对网络带宽的需求也在迅速增长,以适应数据和语音通信。向住宅和小型企业用户提供多媒体服务的接入网存在瓶颈。与此同时,在pda和移动电话使用扩大的推动下,通过无线技术对移动性的需求迅速增长。计算机终端在现代办公室中无处不在的特性也意味着无线网络越来越有吸引力,它没有重新配置有线系统的不便和成本(随时随地的通信)。通过自由空间或光学无线使用红外通信,作为支持未来多媒体服务所需要的高比特率的一种手段,是非常有前途的,因为它提供了潜在的大的未调节带宽。最近,人们越来越认识到光谱的光学部分与无线电作为短距离通信的媒介相比所具有的优势。这与沃里克光学天线等技术进步相结合,使人们对室内和室外应用的光学无线系统产生了兴趣。特别是,光学无线以低成本提供高带宽,不受无线电干扰,不受管制的频谱和消耗很少功率的小组件。本文简要回顾了光无线,并展示了它是如何发展和允许前所未有的自由频谱,安全,不受任何其他射频通信的影响,并在国际上免费提供。
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引用次数: 12
Portable digitally controlled iodine stabilized He-Ne laser with very long lock-up time 便携式数字控制碘稳定氦氖激光器,锁相时间长
Pub Date : 2007-12-01 DOI: 10.1109/ICTONMW.2007.4446975
G. Budzyń, Grzegorz Dudzik, J. Rzepka
A digitally controlled iodine stabilized laser with an increased stabilization (lock-up) time and reduced dependence on the changes of external conditions is described. Its construction is very compact as it consists of only two units: a laser and a power supply and it does not require any external devices for operation, neither a computer nor an oscilloscope. The laser is constructed in such a way that it is possible to transport it from one place to another without necessity of realigning resonator mirrors. The digital control allows full supervision of the device operation and/or unattended operation of the laser. Such laser is suitable for all applications requiring ultimate frequency stability and simple use.
介绍了一种数字式控制的碘稳定激光器,该激光器具有较长的稳定(锁定)时间和较低的对外部条件变化的依赖性。它的结构非常紧凑,因为它只由两个单元组成:一个激光器和一个电源,它不需要任何外部设备进行操作,既不是计算机也不是示波器。这种激光器的构造方式使得它可以从一个地方传输到另一个地方,而不需要重新调整谐振镜。数字控制允许对设备操作和/或无人值守的激光操作进行全面监督。这种激光器适用于所有需要最终频率稳定性和简单使用的应用。
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引用次数: 2
The class of molecules with mobile parts: Catenanes and rotaxanes for nonlinear optical applications 一类具有活动部件的分子:用于非线性光学应用的链烷和轮烷
Pub Date : 2007-12-01 DOI: 10.1109/ICTONMW.2007.4446919
R. Czaplicki, Z. Essaidi, I. Rău, A. Meghea, F. Kajzar, J. Berna-Canovas, D. Leigh, B. Sahraoui
Catenanes and rotaxanes are a new class of functional organic molecules compose from mobile parts and designed for use in various types of practical applications. They can exhibit interesting third order nonlinear optical properties. In this paper we will present and discuss study of the rotational contributions to the cubic susceptibility as observed by polarization dependent degenerate four wave mixing experiments on solutions of selected catenanes and rotaxanes.
链烷和轮烷是一类由可移动部件组成的新型功能有机分子,可用于各种实际应用。它们可以表现出有趣的三阶非线性光学性质。在本文中,我们将介绍并讨论通过极化相关的简并四波混合实验在选定的链烷和轮烷溶液上观察到的旋转对立方磁化率的贡献。
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引用次数: 1
期刊
2007 ICTON Mediterranean Winter Conference
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