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Elaboration and Characterization of a Hybrid Composite Material with Two Particles of the Same Size: Coco Shells and Palm Shells

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Open Journal of Composite Materials 2020年第4期10卷 77-91页

作者： Pierre Marcel Anicet Noah Ebanda Fabien Betene Suzie Viviane Obame Beassoum Allasra martin christian Bindjeme Ateba Atangana Laboratory of Mechanics ENSET University of Douala Douala Cameroon Department of Mechanical Engineering ENSET University of Douala Douala Cameroon

This work aims to develop and characterize a hybrid composite material with two particles of the same size. As reinforcing particles, the hulls of palm nuts and coconut are chosen. Hybrid composite material composites in the form of specimens were produced by molding at 10%, 20% and 30% mass fractions in various sizes (0.63 mm, 1.25 mm and 2.5 mm). The samples were physically characterized (water absorption rate, moisture content, actual, theoretical and apparent density) and mechanical in 3-point flexion. The main results are: the highest and minimum water absorption rate are respectively 3.57% and 0.67% for respectively particle sizes 1.25 mm (sample P10C30) and 0.67% in the size of 0.63 mm (sample P10C10). The moisture content varies from 0.64 to 7.14% respectively for the P20C20 (2.5 mm) and P10C30 (2.5 mm) samples. The maximum and minimum real density are 1340,518 Kg/m3 and 1055.981 Kg/m3, for respectively the composites of particles sizes 1.25 mm (P20C10) and 0.63

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充分发挥功效潜能

现代制造 2006年第25期 44-46页

作者： christian Brecher martin Esser Falco Paepenmueller

切削深度和铣刀转数影响高速切削工艺稳定性，稳定卡描述了转数与切削深度之间的关系。

关键词：工艺稳定性功效分发切削深度高速切削转数铣刀

直接测定固态物质中的溴直接用于固体物料中溴测定的方法

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实验与分析 2011年第3期 58-59页

作者： Anne Wegner Christoph Simon Stephanie Haning christian Mans martin Kreyenschmidt 德国明斯特专科大学

液体样品中溴的测定可顺利地采用JCP—MS分析和离子色谱法，但对于类似聚合物的固体物质中的溴，这种定量分析的方法就存在一些问题，本文介绍了一种可直接测定固体物料中溴的LA—ICP—MS方法，可有效规避样品分解过程中的溴含量损失造... 详细信息

液体样品中溴的测定可顺利地采用JCP—MS分析和离子色谱法，但对于类似聚合物的固体物质中的溴，这种定量分析的方法就存在一些问题，本文介绍了一种可直接测定固体物料中溴的LA—ICP—MS方法，可有效规避样品分解过程中的溴含量损失造成的误差。

关键词：直接测定固体物料溴含量固态物质液体样品离子色谱法固体物质定量分析

高频DC-DC功率变换器的平面电感器的微制造

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磁性元件与电源 2018年第2期 142-150页

作者： Elias Haddad christian martin Bruno Allard Maher Soueidan Charles Joubert 冯文飞法国里昂大学

1介绍电感器是射频（RF）集成电路的基本元件。大量的RF功能通信设备（如移动电话或无线以太网）需要收发器、滤波器和功率放大器，其中电感器是关键组件。近来，随着电子元件小型化的推进，催生了越来越多的便携式设备和高能耗配件。

关键词： DC-DC功率变换器电感器微制造平面高频无线以太网功率放大器基本元件

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纺织

A numerical and experimental comparison of heat transfer in a quasi two-dimensional packed bed

作者： (美)克里斯蒂安·马汀(christian martin)

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Particuology 2024年第1期84卷 136-144页

作者： Matthias Tyslik Mirko Ebert martin Schiemann Siegmar Wirtz christian Lessig Department of Energy Plant Technology Ruhr-University BochumGermany Institute for Simulation and Graphics Otto-von-Guericke-Universität MagdeburgGermany

Heat transfer plays a major role in many industrial processes taking place in packed *** accurate and reliable simulation of the heat exchange between particles is therefore crucial for a reliable operation and to optimize the processes in the *** discrete ordinates method(DOM)provides an established numerical technique to model radiative heat transfer in granular media that offers the possibility to consider the directional dependence of the radiation *** this work,DOM is compared with Monte Carlo ray tracing,which provides an alternative method for heat transfer ***-rically simple configurations are used to investigate the influence of the angular discretization on the accuracy of the results and the computation time in both *** obtained insights are then transferred to a more complex configuration of a quasi two-dimensional test rig consisting of metal rods for which also experimental results are *** results show that both DOM and Monte Carlo ray tracing allow for an accurate simulation of heat transfer in packed *** Carlo ray tracing requires thereby computation times that are surprisingly competitive(although still somewhat slower)compared to DOM and allows for an easier computation of highly accurate reference *** our preliminary comparison to the experimental test rig,Monte Carlo ray tracing also provides the advantage that it can more easily model highly specular materials such as stainless *** methods are comparable for diffuse materials such as magnesium oxide.

关键词： Heat transfer Discrete ordinates method Monte Carlo ray tracing

Investigation on aerodynamic force effect of vacuum plumes using pressure-sensitive paint technique and CFD-DSMC solution

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Science China(Technological Sciences) 2017年第7期60卷 1058-1067页

作者： WU Jing BITTER martin CAI GuoBiao HE BiJiao KAEHLER christian School of Astronautics Beijing University of Aeronautics and Astronautics R&D Center CRRC Qingdao Sifang Co. Ltd. Institute of Fluid Mechanics and Aerodynamics Bundeswehr University Munich

Pressure-sensitive paint(PSP) technique was employed to experimentally investigate the aerodynamic force effect of vacuum plume in this study. The characterization and comparison for two types of PSP were firstly conducted in an air pressure range from0.05 to 5000 Pa. The PSPs were prepared using PtTFPP as the active dye and different binders, i.e., polymer-ceramic(PC) and poly(1-trimethylsilyl-1-propyne) [poly(TMSP)]. The static calibrations showed that PtTFPP/poly(TMSP) had a higher pressure sensitivity and a lower temperature dependency compared to PtTFPP/PC in this pressure range. The pressure distributions of a single and two interacting plumes impinging onto a flat plate model were measured using PSP technique. The experimental data were compared to numerical solutions that combined both the computed fluid dynamics(CFD) and direct simulation Monte Carlo(DSMC) methods. Remarkable agreements were achieved, demonstrating the feasibility and accuracy of the numerical ***, the aerodynamic force effect of interacting plumes at different separation distances was investigated numerically.

关键词： vacuum plume plume interaction aerodynamic force effect pressure-sensitive paint CFD-DSMC

Laser-Welded Steel Foils with Sapphire Substrates

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Acta Metallurgica Sinica(English Letters) 2016年第7期29卷 683-688页

作者： Araceli de Pablos-martin christian Grosse Andreas Cismak Thomas Hoche Fraunhofer Institute for Microstructure of Materials and Systems IMWS Walter-Htilse-Strage 1 06120 HalleGermany

A nanosecond pulsed laser was used to weld stainless steel foils of 10 ~tm thickness to the sapphire substrates. The microstructure of the bonded interface was studied. Both materials were partially ablated under the influence of the laser beam. An inhomogeneous distribution of the steel and sapphire along the bonded interface is observed. The electrical resistance of the steel foil was measured before and after laser welding, showing that the weld slightly increases the electrical resistance but still keeps the values acceptable for electrical contacts.

关键词： Laser welding Stainless steel Sapphire Electrical resistance

Wear dependent virtual flow rate sensor for progressing cavity pumps with deformable stator

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Petroleum Science 2024年第2期21卷 1346-1353页

作者： Jens Müller Sebastian Leonow Johannes Schulz christian Hansen martin Monnigmann Ruhr-Universitat Bochum Universit atsstraûe 150Bochum44801Germany SEEPEX GmbH Scharnh olzstraûe 344Bottrop46240Germany

This contribution presents a novel wear dependent virtual flow rate sensor for single stage single lobe progressing cavity pumps. We study the wear-induced material loss of the pump components and the impact of this material loss on the volumetric efficiency. The results are combined with an established backflow model to implement a backflow calculation procedure that is adaptive to wear. We use a laboratory test setup with a highly abrasive fluid and operate a pump from new to worn condition to validate our approach. The obtained measurement data show that the presented virtual sensor is capable of calculating the flow rate of a pump being subject to wear during its regular operation.

关键词： Backflow Progressing cavity pump Virtual sensor Wear