FE-CutS - Finite Elemente Modell für makroskopische Zerspanprozesse : Modellierung, Anaylse und Simulation

The resulting complex thermal and mechanical load pectrum in dry machining processes leads to temperature induced shape deviations of metallic orkpieces which changes its behavior for future use. Research projects try to compensate for manufacturing inaccuracies, resulting from the process, during the planning phase by using simulation-supported methods. The finite element method (FEM) is an appropriate tool to calculate thermomechanical behavior of workpieces by applying thermal and mechanical loads. This thesis describes the modeling and simulation of the thermal and mechanical behavior of workpieces considering material removal during the processes by FEM. In this case the FEM is linked to a dexel model to visualize the geometry change also in the FEM. During the mathematical modeling the heat equation is coupled to the quasi-stationary linear-elastic deformation equation on a time-dependent domain with changing boundaries. Heat fluxes and process forces are given from a process model and exist only during the tool-workpiece-interaction. These informations are project to the time-dependent bounds of the workpiece. Here a new visualization of material removal on unfitted meshes is presented. The mesh is divided into two time-dependent disjoint parts. One for the time-dependent workpiece and one for the removed material. The geometry of the workpiece is approximated on time changing bounds by adjusted adaptive methods. The analysis shows good results for the approximation with a controllable volume error. On thus time-dependent domain the thermal and mechanical workpiece behavior during machining processes could be simulated in a realistic case. During the processes the identification and compensation of shape deviations will be possible. The model can be extended for other processes with geometrically defined edges

MASKÁT

After describing the specific religious attitudes and affiliations of the inhabitants this description of the harbour and city of Maskat in Oman turns to issues of security, trade, traffic, architecture and climatic conditions. &nbsp

Status of the BELLE II Pixel Detector

The Belle II experiment at the super KEK B-factory (SuperKEKB) in Tsukuba, Japan, has been collecting $e^+e^−$ collision data since March 2019. Operating at a record-breaking luminosity of up to $4.7×10^{34} cm^{−2}s^{−1}$, data corresponding to $424 fb^{−1}$ has since been recorded. The Belle II VerteX Detector (VXD) is central to the Belle II detector and its physics program and plays a crucial role in reconstructing precise primary and decay vertices. It consists of the outer 4-layer Silicon Vertex Detector (SVD) using double sided silicon strips and the inner two-layer PiXel Detector (PXD) based on the Depleted P-channel Field Effect Transistor (DePFET) technology. The PXD DePFET structure combines signal generation and amplification within pixels with a minimum pitch of $(50×55) μm^2$. A high gain and a high signal-to-noise ratio allow thinning the pixels to $75 μm$ while retaining a high pixel hit efficiency of about $99$. As a consequence, also the material budget of the full detector is kept low at $≈0.21$$\frac{X}{X_0}$ per layer in the acceptance region. This also includes contributions from the control, Analog-to-Digital Converter (ADC), and data processing Application Specific Integrated Circuits (ASICs) as well as from cooling and support structures. This article will present the experience gained from four years of operating PXD; the first full scale detector employing the DePFET technology in High Energy Physics. Overall, the PXD has met the expectations. Operating in the intense SuperKEKB environment poses many challenges that will also be discussed. The current PXD system remains incomplete with only 20 out of 40 modules having been installed. A full replacement has been constructed and is currently in its final testing stage before it will be installed into Belle II during the ongoing long shutdown that will last throughout 2023

Research and Design of a Routing Protocol in Large-Scale Wireless Sensor Networks

无线传感器网络，作为全球未来十大技术之一，集成了传感器技术、嵌入式计算技术、分布式信息处理和自组织网技术，可实时感知、采集、处理、传输网络分布区域内的各种信息数据，在军事国防、生物医疗、环境监测、抢险救灾、防恐反恐、危险区域远程控制等领域具有十分广阔的应用前景。 本文研究分析了无线传感器网络的已有路由协议，并针对大规模的无线传感器网络设计了一种树状路由协议，它根据节点地址信息来形成路由，从而简化了复杂繁冗的路由表查找和维护，节省了不必要的开销，提高了路由效率，实现了快速有效的数据传输。 为支持此路由协议本文提出了一种自适应动态地址分配算——ADAR（AdaptiveDynamicAddre...As one of the ten high technologies in the future, wireless sensor network, which is the integration of micro-sensors, embedded computing, modern network and Ad Hoc technologies, can apperceive, collect, process and transmit various information data within the region. It can be used in military defense, biomedical, environmental monitoring, disaster relief, counter-terrorism, remote control of haz...学位：工学硕士院系专业：信息科学与技术学院通信工程系_通信与信息系统学号：2332007115216

Voyage en Arabie et en d' autres Pays circonvoisins, par C.N.

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Desciption de l' Arabie faite sur les observations propres et des avis recueillis dans les lieux mêmes, par C.N.

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Highlights from the Belle II Experiment andFlavour Physics in e+e−e^+e^- annihilation

Highlights from the Belle II experiment and Flavour Physics in e+e- annihilatio