The research covers the multi-faceted activities of Nikolai Ozmidoff (Николай Озмидов; 1850–1938), a specialist in electrical engineering, member academic staff (1884–1918) Riga Polytechnicum (RP) / Polytechnic Institute (RPI), professor (1906), various positions – working on railway Switzerland and Germany, geodesy, surveying, engineering Riga, as well his pedagogical scientific at RP RPI Ivan...

Warm-up. It is an easy exercise to prove that for all A we have RigA(r) ≤ (n− r)2. This is nearly tight by a direct counting argument: Valiant [Val77, Theorem 6.4] proves that RigA(r) is at least about (n− r)2/ log n for a random A (and all fields F). This shows that rigid matrices exist in great numbers—however, as always, the challenge is to exhibit an explicit such matrix. Currently, the bes...

The main goal of the current research is to investigate numerical computation Ag/Al2O3 nanofluid over a Riga plate with injection/suction. energy equation formulated using Cattaneo–Christov heat flux, non-linear thermal radiation, and sink/source. leading equations are non-dimensionalized by employing suitable transformations, results achieved MATLAB bvp4c technique. fluctuations fluid flow tra...

The impact of heat-absorbing viscoelastic nanofluidic flow along with a convectively heated porous Riga plate Cattaneo-Christov double flux was analytically investigated. Buongiorno model nanofluid implemented the diversity Brownian motion and thermophoresis. Making use transformations; PDE systems are altered into an ODE system. We homotopy analysis method to solve these analytically. reaction...

L’auteur de l’article analyse les causes du déclenchement la guerre polono-soviétique 1919–1921 et ses conséquences grande envergure pour Pologne, Russie soviétique (plus tard l’Union soviétique) aussi l’Europe. Une thèse a été formulée sur le sens complémentaire traité Riga au Versailles. utilise terme « ordre Versailles-Riga », qui existait dans l’Europe l’entre-deux-guerres fut finalement re...

This study aims to show the role of stagnation point flow in solar optimization presence a Riga plate. requirement is conceivable case energy management with suitable collector covering and visual thermal optimization. Solar radiation convection glycol (C3H8O2)-based aluminum oxide (Al2O3) copper (Cu) nanoparticles were used for collector, studied terms theoretically. Stagnation refers state sy...