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Abstract

Considering concrete nonlinearity, the wave height limit between small and large amplitude sloshing is defined based on the Bernoulli equation. Based on Navier-Stokes equations, the mathematical model of large amplitude sloshing is established for a Concrete Rectangle Liquid-Storage Structure (CRLSS). The results show that the seismic response of a CRLSS increases with the increase of seismic intensity. Under different seismic fortification intensities, the change in trend of wave height, wallboard displacement, and stress are the same, but the amplitudes are not. The areas of stress concentration appear mainly at the connections between the wallboards, and the connections between the wallboard and the bottom.

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Authors and Affiliations

X. Cheng
D. Li
P. Li
X. Zhang
G. Li
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Abstract

The contemporary warfare seems to have great influence on the way social sciences position themselves within the socio-political contexts of today. This is being implemented in many cases by the geopolitical context of 9/11 and the fall of former centers of power (end of the Cold War). Cultural anthropology, which shared a similar dilemma in the formative period of its own history provides us today with one of the most controversial examples in this matter. The program initiated by US Army back in 2006 called Human Terrain System started a wide spread debate on ethical issues regarding doing ethnographic fieldwork in a militarized landscape. HTS became thus a field of intellectual and political polemics between certain groups of researches. The academic and political debate on HTS seems to be put in a post-colonial context as a new form of mixing of science and ideology. This paper tackles the problem of emergence of a new type of anthropological understanding of the cultural other and as well its own methods and ethical standards in a situation, where crisis seems to be a permanent state of the discipline and the world its trying to describe.

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Authors and Affiliations

Jarema Drozdowicz
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Abstract

Accurate demagnetization modelling is mandatory for a reliable design of rare-earth permanent magnet applications, such as e.g. synchronous machines. The magnetization of rare-earth permanent magnets requires high magnetizing fields. For technical reasons, it is not always possible to completely and homogeneously achieve the required field strength during a pulse magnetization, due to stray fields or eddy currents. Not sufficiently magnetized magnets lose remanence as well as coercivity and the demagnetization characteristic becomes strongly nonlinear. It is state of the art to treat demagnetization curves as linear. This paper presents an approach to model the nonlinear demagnetization in dependence on the magnetization field strength. Measurements of magnetization dependent demagnetization characteristics of rare-earth permanent magnets are compared to an analytical model description. The physical meaning of the model parameters and the influence on them by incomplete magnetization are discussed for different rare-earth permanent magnet materials. Basically, the analytic function is able to map the occurring magnetization dependent demagnetization behavior. However, if the magnetization is incomplete, the model parameters have a strong nonlinear behavior and can only be partially attributed to physical effects. As a benefit the model can represent nonlinear demagnetization using a few parameters only. The original analytical model is from literature but has been adapted for the incomplete magnetization. The discussed effect is not sufficiently accurate modelled in literature. The sparse data in literature has been supplemented with additional pulsed-field magnetometer measurements.

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Authors and Affiliations

Gregor Bavendiek
Fabian Müller
Jamshid Sabirov
Kay Hameyer
ORCID: ORCID

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