Some physical concepts important for a hysteresis model (effective field, anhysteretic magnetization) are discussed on the example of Jiles-Atherton model. The Jiles-Atherton model reveals some drawbacks, which make this model more difficult to be applied in electrical engineering. In particular, it does not describe accurately the magnetization curves after a reversal, moreover complex magnetization cycles are poorly represented. On the other hand, the phenomenological description proposed by Takács seems to be a valuable alternative to the Jiles-Atherton formalism. The concept of effective field may be easily incorporated in the description.

This article discusses the main points in the Bertrand Russell and Frederick Copleston’s debate about the existence of God. Copleston defended the cosmological argument based on a sufficient reason and argued against radical contingency in explaining the origin of the world. During the debate, the understanding of necessity was discussed, whether the word ‘God’ is a proper name or a description, whether the universe as a whole can have a cause, and the arguments about the origin of the world formulated in modern physics. The whole debate is an excellent example of the difference between a theist and an atheist with regard to Leibnizian type of the cosmological argument.i

The joined wing concept is an unconventional airplane configuration, known since the mid-twenties of the last century. It has several possible advantages, like reduction of the induced drag and weight due to the closed wing concept. The inverted joined wing variant is its rarely considered version, with the front wing being situated above the aft wing. The following paper presents a performance prediction of the recently optimized configuration of this airplane. Flight characteristics obtained numerically were compared with the performance of two classical configuration airplanes of similar category. Their computational fluid dynamics (CFD) models were created basing on available documentation, photographs and some inverse engineering methods. The analysis included simulations performed for a scale of 3-meter wingspan inverted joined wing demonstrator and also for real-scale manned airplanes. Therefore, the results of CFD calculations allowed us to assess the competitiveness of the presented concept, as compared to the most technologically advanced airplanes designed and manufactured to date. At the end of the paper, the areas where the inverted joined wing is better than conventional airplane were predicted and new research possibilities were described.

The social and political transformations Russia underwent in the 20th century were also reflected in the sphere of imagery. This also refers to the imagery of movement and means of transport. The process of linking the imagery of means of transportation with the political doctrine in force is mostly visible in the period of Soviet rule, in particular in the interwar period when the foundations of this rule were laid. Then, aviation was to become one of the strongly ideologized means of transport. The ideologization process occurred at various levels, starting from onomastic procedures through advertising and linking aviation and Soviet rule within artistic and literary conceptualisations. In Soviet culture, an aeroplane or a rocket were not merely means of transport but the means by which the expansion of communist ideology globally was supposed to be facilitated.