Calcium sulfonates derived from sulfonation of heavy alkylate and aromatic extract were synthesized and reacted with formalin to produce anionic polymer in the presence of phase transfer catalysts (PTC). These catalysis ...

A new approach to a company’s information systems is needed, if we take into consideration the globalization process of the economy, the intensified competition, the impose of new qualitative demands or the adjustment ...

Welding by cold pressing on cogged surfaces, produces the joint of a component made from an easy deformable metal by pressing on the cogged surface of a harder metal component. Different welds between aluminium (the ...

Lucrarea Niculae Moromete între presiunea istoriei colective și căutarea de sine a pornit de la necesitatea clarificării principalelor trăsături ale personalită ții personajului Niculae Moromete, un alter-ego al scriitorului ...

Situarea culturii noastre într-o zonă marginală a Europei Central-Estice face ca prezența numelor românești în panoplia laureaților premiului Nobel să fie atât de rară. Din când în când, orgoliul nostru, al celor născuți ...

The excessive noise exposure is one of numerous physical hazards present in the steel industry. Considerable noise develops the steel strips rolling process. In this study are presented and discussed the noise levels at ...

Friction, especially its nonlinear components, may degrade the tracking performance of any servo drive systems. Focused on high precision positioning of DC electrical drive the paper proposes an easy method to compensate ...

Thermal effects inside the vibration elastomeric isolators have usually been neglected and this aspect can leads to certain differences between simulations and experiments. Continuous damping during the working cycle ...