Simultaneous Presentation of Ankylosing Spondylitis and Pancreatic Cancer: A Case Report

A clinical case of simultaneous presentation of ankylosing spondylitis and pancreatic cancer is described. Patients with rheumatic disorders must be closely followed to screen for malignancies. Most paraneoplastic rheumatic syndromes are difficult to distinguish from autoimmune rheumatic diseases; thus, cancer occurrence may constitute a major diagnostic challenge

Study on advanced aerogenerator with “rotor-in-socket” assembly type

Introduction. There is a performance improvement problem of the existing wind-driven power plants (WPP). It is worthwhile investigating nonclassical types of the WPP to solve it. The most promising are the WPP which use special guide static elements to create vortex structures. The latter contributes to the increased aerodynamic efficiency of the WPP. Materials and Methods . Ansys Workbench and Ansys Fluent software packages are used to calculate the design aerodynamics of the wind turbines. Research Results. On the analysis of the particular publications, the viability of the vortex-type WPP studies in which the additional stator structures are used to increase their energy efficiency, is proved. The aerodynamics analysis of the WPP with “rotor-in-socket” assembly type is carried out using the continuum dynamics computational methods. An advanced WPP design is obtained by the aerodynamic optimization technique. Discussion and Conclusions. The obtained results show that the construction of the vortex-type turbine on the basis of the favourable interference concept of rotor and stator is promising. The specific form of WPP with a vertical axis of rotation, axisymmetric stator and socket of special forms is analyzed. The methods of the aerodynamic optimization of the described WPP design are considered. On the basis of this methodology, an advanced socket form and its assembly with the rotor which allows reaching an average calculated value of the favourable air moment that exceeds more than twofold the corresponding value for the initial geometry of the WPP, are obtained

Laser-induced electron dynamics and surface modification in ruthenium thin films

We performed the experimental and theoretical study of the heating and damaging of ruthenium thin films induced by femtosecond laser irradiation. We present the results of an optical pump-probe thermoreflectance experiment with rotating sample allowing to significantly reduce heat accumulation in irradiated spot. We show the evolution of surface morphology from growth of a heat-induced oxide layer at low and intermediate laser fluences to cracking and grooving at high fluences. Theoretical analysis of thermoreflectance in our pump-probe experiment allows us to relate behavior of hot electrons in ruthenium to the Fermi smearing mechanism. This conclusion invites more research on Fermi smearing of transition metals. The analysis of heating is performed with the two-temperature modeling and molecular dynamics simulation, results of which demonstrate that the calculated single-shot melting threshold is higher than experimental damage threshold. We suggest that the onset of Ru film damage is caused by the heat-induced stresses that lead to cracking of the Ru film. Such damage accumulates during repetitive exposure to light

Vertebral triangle of doctor A.N. Kazantsev - double vertebral artery in V3 segment

We have described a variant of the structure of the vertebral artery. In the V3 segment, the vertebral artery bifurcated and then joined again. This building looks like a triangle. Such anatomy has not been previously described in the world literature. By the right of the first description, this anatomical formation was called the «vertebral triangle of Dr A.N. Kazantsev». This discovery was made during stenting of the V4 segment of the left vertebral artery in the most acute period of stroke