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Simulation of High Density Pedestrian Flow: A Microscopic Model

Open Journal of Modelling and Simulation 2015年第3期3卷 81-95页

作者： Mohamed H. dridi Institute für Theoretische Physik Unversit&auml t Stuttgart Stuttgart Germany

In recent years, modelling crowd and evacuation dynamics has become very important, with increasing huge numbers of people gathering around the world for many reasons and events. The fact that our global population grows dramatically every year and the current public transport systems are able to transport large amounts of people heightens the risk of crowd panic or crush. Pedestrian models are based on macroscopic or microscopic behaviour. In this paper, we are interested in developing models that can be used for evacuation control strategies. This model will be based on microscopic pedestrian simulation models, and its evolution and design requires a lot of information and data. The people stream will be simulated, based on mathematical models derived from empirical data about pedestrian flows. This model is developed from image data bases, so called empirical data, taken from a video camera or data obtained using human detectors. We consider the individuals as autonomous particles interacting through social and physical forces, which is an approach that has been used to simulate crowd behaviour. The target of this work is to describe a comprehensive approach to model a huge number of pedestrians and to simulate high density crowd behaviour in overcrowding places, e.g. sport, concert and pilgrimage places, and to assist engineering in the resolution of complicated problems through integrating a number of models from different research domains.

关键词： Pedestrian Dynamics Crowd Simulation and Modelling Crowd Management and Pedestrian Safety Crowd Control Objects Tracking High Density Pedestrian Flow Hajj Simulation

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Structural Study, Vibrational, Optical, Thermal Properties and Hirshfeld Surface Analysis of a New Iron (III) Complex: FeCl4(C5N2H6)(C5N2H5)

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Crystal Structure Theory and Applications 2021年第1期10卷 14-26页

作者： Amal Arouri Rihab dridi Riadh Kefi Mohamed Faouzi Zid Laboratory of Materials Crystal Chemistry and Applied Thermodynamics Faculty of Sciences of Tunis University of Tunis El Manar Tunis Tunisia Laboratory of Chemistry of Materials Faculty of Sciences of Bizerte University of Carthage Bizerte Tunisia

The title compound, FeCl4(C5N2H6)(C5N2H5) consists of two [(C5N2H6) (C5N2H5)]+ organic cations and [FeCl4]- anion. The geometry of the iron ion is tetrahedral, formed by four chlorine atoms. The complex was characterized by single crystal X-ray diffraction, Fourier Transform Infrared spectroscopy, thermal analysis and UV-Visible spectroscopy. Hirshfeld surface analysis was also used for understanding the intermolecular interactions in the crystal packing. Single-crystal X-ray diffraction analysis indicates that this complex crystallizes in the monoclinic system, P21/c space group with a = 7.598 (3) Å, b = 13.694 (4) Å, c = 17.105 (5) Å, β = 97.203 (6)° V = 1765.7 (10) Å3 and Z = 4. The [FeCl4]- anion and [(C5N2H6)(C5N2H5)]+ cations are linked through three-dimensional hydrogen-bonding network consisting of N-H...Cl and π-π interactions. Hirshfeld surface analysis and the related 2D fingerprint plots reveal that the complex is dominated by N-H...Cl contacts.

关键词： Complex Crystal Structure X-Ray Analysis Optical Study Thermal Analysis Hirshfeld Surface

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Synthesis, Structural, Spectroscopic, Thermal, Optical Studies and Hirshfeld Surface Analysis of a New Aluminum Complex: (C8H9N2)3[Al(C2O4)3]·3H2O

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Crystal Structure Theory and Applications 2019年第3期8卷 29-43页

作者： Amal Arouri Rihab dridi Laurent Jouffret Mohamed Faouzi Zid Laboratory of Materials Crystal Chemistry and Applied Thermodynamics Faculty of Sciences of Tunis University of Tunis El Manar Tunis Tunisia Clermont Auvergne University Clermont-Ferrand France

The compound, tris-(5-methylbenzimidazole) tris-(oxalato)-aluminate (III) trihydrate, (C8H9N2)3[Al(C2O4)3]·3H2O, was synthesized by slow evaporation at room temperature and characterized by single crystal X-ray diffraction and X-ray powder diffraction, infrared (IR), ultraviolet (UV-visible) spectroscopies, and thermal analysis. The results show that this complex crystallizes in the monoclinic system, space group P21/c, with the mesh parameters a = 13.499(7) Å, b = 14.872(9) Å, c = 16.995(5) Å, β = 91.44(3)°, V = 3411(3) Å3 and Z = 4. The formula unit is composed of tris-(oxalato)-aluminate [Al(C2O4)3]3- anions, tris-(5-methylbenzimidazole) cations and three uncoordinated water molecules. The geometry of the aluminum ion is octahedral, formed by six oxygen atoms belonging to three oxalate anions serving as chelating ligands. Cohesion of the structure is ensured by intermolecular hydrogen bonds of O-H...O, N-H...O type linking ionic entities and water molecules as well as by π-π and π-π* between cycles of 5-methylbenzimidazole cations. In order to clarify the intermolecular interactions formed by the organic cations and inorganic anions, an analysis of the calculated Hirshfeld surfaces was used. The UV-Vis spectrum reveals an optical band gap width of 2.88 eV, which shows that this compound has a semiconductor material behavior.

关键词： Aluminum (III) Complex Crystal Structure X-Ray Analysis Spectroscopic Studies Thermal Analysis Hirshfeld Surface Analysis Semiconductor Material

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从上腭获取移植结缔组织会有出血的风险：是真的吗？

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中国口腔医学继续教育杂志 2009年第6期12卷 1-8页

作者： Sophie-Myriam dridi Michel Chousterman Marc Danan Jean Francois Gaudy 王宪娥（译）徐莉（审）不详北京大学口腔医院牙周科 100081

为获得较好的上皮下结缔组织移植的临床效果．大多数作者都把重点放在手术技术上。然而．很少有研究报道这种手术干预可能引发的并发症。尽管手术并发症并不是经常出现且没有生命危险．但并发症确实存在。这些并发症让手术者产生了担心... 详细信息

为获得较好的上皮下结缔组织移植的临床效果．大多数作者都把重点放在手术技术上。然而．很少有研究报道这种手术干预可能引发的并发症。尽管手术并发症并不是经常出现且没有生命危险．但并发症确实存在。这些并发症让手术者产生了担心．而最使手术者担心的并发症是术中及术后出血．而这种情况是否发生取决于腭黏膜固有的血管分布的密度。本文是一项人类解剖学的研究，作者证实了硬腭形态学与腭大血管神经束的分布之间的关系．由此证实此关系是否是选择治疗方案的决定因素。本研究包括了与应用解剖有关的两部分：骨学（第一部分）及解剖（第二部分）。第一部分包括30个不同形状和不同缺失牙牙列的上颔骨，作者观察和比较了腭大血管神经束、硬腭形态与拔牙和戴入可摘局部义齿后骨重建之间的关系；第二部分包括12个新鲜的人类尸体上的上颌骨．向其动脉系统注入彩色乳胶后，切开标本，观察腭大神经血管束的分布。运用不同的组织获取技术对两个不同形态的上腭进行解剖手术。这样．手术者就可以首先详细了解硬腭的血管分布状况．然后估算获取结缔组织区域与腭大血管神经束分支的关系，最后制定出预防出血的方法。

关键词：结缔组织移植出血性风险人类硬腭腭动脉

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