Performing ab initio calculations, we reveal that the magnetic anisotropy (MA) and the spin direction of a single adatom can be manipulated with a combination of electric fields and adsorption of molecules. Choosing the Fe adatom on the Cu2/Cu(001) surface as a typical model system, we show that the MA of the pristine Fe adatom and the Fe adatom with an additional H or F atom adsorption remarkably changes by applying an external electric field. Moreover, we show that the F adsorption leads to the spin-reorientation transition of the Fe adatom from in plane to out of plane. Controlling the magnetization dynamics of a single magnetic adatom by molecule adsorption is demonstrated.

Modal participation factors are widely used in the power industry and other applied areas. Hashlamoun, Hassouneh, and Abed (2009) observed that the definition of state-in-mode participation factors (SIMPFs) commonly used in the modal analysis of linear systems could lead to inadequate results. Accordingly, they proposed an alternative definition of SIMPFs. This study uncovered a weakness in their formulation in that it yields results highly sensitive to varying eigenvector normalizations for complex eigenvalues. Thus, we present a modified well-defined formulation and interpretation of SIMPFs in this note. The proposed approach combines the framework of averaging over an uncertain set of initial conditions, introduced by Hashlamoun, Hassouneh, and Abed, with the novel concept of modal energy. Following this approach, an alternative definition for mode-in-state participation factors (MISPFs) was discovered, which differs from the conventional definition. Simple examples are used to show that new definitions provide more accurate measures of state-in-mode and mode-in-state participations compared to conventional participation factors in the case of an arbitrary distribution of initial conditions over state variables. In particular, the proposed energy-based interpretation of novel indicators precludes negative or complex measures

Multiple Coulomb scattering makes it possible to explain the refraction and partial reflection phe- nomena of charged particle beams while traversing an incline target installed on the beam path. Since the reflection coefficient is energy-dependent, its measured value may be used for calculating beam energy.

The paper considers the problem of estimating the angle of attack of an aircraft only by indications of accelerometers that are rigidly set on its fuselage. This task is posed as a task of “realization”, when the structure and the order of linearized model of the estimation problem is unknown. The possibility of solving this problem is analyzed.

The calibration problem is considered for the accelerometer unit at a high-precision test bench. Besides instrumental errors of the accelerometer unit itself, possible faults of the test bench (which are accumulated during its operation) are taken into account. One of the main problems is to choose the optimal design of the angular positions of the unit. The guaranteed approach is proposed to determine this optimal design.