Alexandru Popa received a Physicist Engineer degree at the Polytechnic University of Bucharest in 1966, a Master of Science degree from the University of California, Berkeley, in 1972, and a Ph.D. from the Polytechnic University of Bucharest in 1974. He was a Senior Researcher at the Laser Department, National Institute for Laser, Plasma and Radiation Physics, Institute of Atomic Physics, Bucharest. Since 2016 he has been retired but still works in the field of physical systems modeling.Among his achievements, over a period of more than 50 years, are a connection between quantum equations and classical equations of physical systems, a wave model for atomic and molecular systems, whose accuracy is comparable to the accuracy of the standard Hartree–Fock model and accurate models of relativistic and ultra-relativistic interactions between laser beams and electrons. The wave model is extended to new fields such as molecular biology and the generation of electromagnetic waves and very short pulses in the attosecond domain.

• I.1. Connection between Schrödinger and Hamilton-Jacobi equations in the case of stationary atomic and molecular systems.I.2. Connection between Klein-Gordon and relativistic Hamilton-Jacobi equations for systems composed of electromagnetic fields and particles.

"This third edition includes chapters by Martin Evans and Shinya Yamanaka, who were awarded the Nobel Prize in 2007 and 2012 respectively for their discoveries regarding embryonic stem cells. Writing for students and general readers, they and other scientists describe recent developments in both embryonic and adult stem cell research. They cover basic biology and mechanisms, tissue and organ development, methods, applications, and regulation and ethics." --ProtoView.com, February 2014

Alexandru Popa received a Physicist Engineer degree at the Polytechnic University of Bucharest in 1966, a Master of Science degree from the University of California, Berkeley, in 1972, and a Ph.D. from the Polytechnic University of Bucharest in 1974. He was a Senior Researcher at the Laser Department, National Institute for Laser, Plasma and Radiation Physics, Institute of Atomic Physics, Bucharest. Since 2016 he has been retired but still works in the field of physical systems modeling.Among his achievements, over a period of more than 50 years, are a connection between quantum equations and classical equations of physical systems, a wave model for atomic and molecular systems, whose accuracy is comparable to the accuracy of the standard Hartree–Fock model and accurate models of relativistic and ultra-relativistic interactions between laser beams and electrons. The wave model is extended to new fields such as molecular biology and the generation of electromagnetic waves and very short pulses in the attosecond domain.

• I.1. Connection between Schrödinger and Hamilton-Jacobi equations in the case of stationary atomic and molecular systems.I.2. Connection between Klein-Gordon and relativistic Hamilton-Jacobi equations for systems composed of electromagnetic fields and particles.

"This third edition includes chapters by Martin Evans and Shinya Yamanaka, who were awarded the Nobel Prize in 2007 and 2012 respectively for their discoveries regarding embryonic stem cells. Writing for students and general readers, they and other scientists describe recent developments in both embryonic and adult stem cell research. They cover basic biology and mechanisms, tissue and organ development, methods, applications, and regulation and ethics." --ProtoView.com, February 2014

Alexandru Popa received a Physicist Engineer degree at the Polytechnic University of Bucharest in 1966, a Master of Science degree from the University of California, Berkeley, in 1972, and a Ph.D. from the Polytechnic University of Bucharest in 1974. He was a Senior Researcher at the Laser Department, National Institute for Laser, Plasma and Radiation Physics, Institute of Atomic Physics, Bucharest. Since 2016 he has been retired but still works in the field of physical systems modeling.Among his achievements, over a period of more than 50 years, are a connection between quantum equations and classical equations of physical systems, a wave model for atomic and molecular systems, whose accuracy is comparable to the accuracy of the standard Hartree–Fock model and accurate models of relativistic and ultra-relativistic interactions between laser beams and electrons. The wave model is extended to new fields such as molecular biology and the generation of electromagnetic waves and very short pulses in the attosecond domain.

• I.1. Connection between Schrödinger and Hamilton-Jacobi equations in the case of stationary atomic and molecular systems.I.2. Connection between Klein-Gordon and relativistic Hamilton-Jacobi equations for systems composed of electromagnetic fields and particles.

"This third edition includes chapters by Martin Evans and Shinya Yamanaka, who were awarded the Nobel Prize in 2007 and 2012 respectively for their discoveries regarding embryonic stem cells. Writing for students and general readers, they and other scientists describe recent developments in both embryonic and adult stem cell research. They cover basic biology and mechanisms, tissue and organ development, methods, applications, and regulation and ethics." --ProtoView.com, February 2014