Technology: general issues 17 History of engineering and technology 11 History of engineering & technology 9 Analytic solution 6 Analytical solution 6 Research & information: general 5 analytical solution 3 Alternating magnetic field 2 Approximate analytic solution 2 Crystals 2 DC magnetic field 2 Four level system 2 Four-wave-mixing 2 Four-wave-mixing process 2 Laplace transforms 2 Magnetic fields 2 Magnetic storage 2 Magnetic-field 2 Magnetohydrodynamics 2 Magnets 2 Mathematics & science 2 Microwave 2 Microwave pulse 2 Molecular magnet 2 Molecular magnets 2 Nonlinear equations 2 Ordinary differential equations 2 Perturbation techniques 2 Physics 2 Probes 2