Using Cartan's differential 1-forms theory, and assuming that the motion variables depend on Euclidean invariants, certain dynamics of the material point and systems of material points are developed. Within such a frame, the Newtonian force as mass inertial interaction at the intragalactic scale, and the Hubble-type repulsive interaction at intergalactic distances, are developed.The wave-corpuscle duality implies movements on curves of constant informational energy, which implies both quantizations and dynamics of velocity limits.Analysis of motion of a charged particle in a combined field which is electromagnetic and with constant magnetism implies fractal trajectories. Mechanics of material points in a fractalic space is constructed, and various applications — fractal atom, potential well, free particle, etc. — are discussed.

This book examines the study of mechanical systems as well as its links to other sciences of nature. It presents the fundamentals behind how mechanical theories are constructed and details the solving methodology and mathematical tools used: vectors, tensors and notions of field theory. It also offers continuous and discontinuous phenomena as well as various mechanical magnitudes in a unitary form by means of the theory of distributions.

This volume showcases the valuable achievements of the Romanian technology and industry worldwide. It started from the premise that the history of Romanian technique is scarcely known outside the borders of Romania. The main Romanian contributions to the world’s technological heritage are missing, except for a few names in the field of aviation, from the great encyclopedias and dictionaries published worldwide. This is due, among other reasons, to the insufficient promotion in widely spoken languages of the history of Romanian technology. The multidisciplinary approach of the volumes means that the field of technology had to be split into several branches. The present volume includes the following industries: mining, metallurgy, oil, natural gas, machine building, agricultural machinery, military, textiles, and construction. Folk technology, the formation of the industrial system, and mechanics are tackled in separate chapters. For each field, are engaged the collaboration of authors who have already published a history of their field. Certain chapters were drafted with the aid of specialists who have played the part of policy makers in the elaboration of development strategies for Romania and who are familiar not only with the facts and the history of their field, but also with the ‘philosophy’ behind its development.