Publications by authors named "R M Rozental"
Article Synopsis
- The study investigates how the brain, particularly the prefrontal cortex (PFC), recovers after injury and focuses on low-frequency oscillatory activity (LFO) as a key factor in this process.
- Data were collected from a patient, E.L., who had significant PFC damage due to an accident, and assessments included various clinical and neuropsychological tests to understand the relationship between LFO and cognitive function.
- Findings revealed that LFO activity varied with movement and brain hemisphere recruitment, suggesting potential targets for neuromodulation to improve executive functions, highlighting differences between E.L. and historical cases like Phineas Gage regarding cognitive impairments.
We discovered a specific property of the eigenmodes of a cylindrical waveguide, due to which efficient mode excitation at ultrahigh (s=4n+1, n is integer) multiples of the gyrofrequency can be provided by a polyhelical weakly relativistic electron beam, standardly used for gyrotron operation. In the proof-of-principle experiment with a V-band gyrotron driven by a 25-keV, 2-A beam, about 100 mW radiation power at the fifth cyclotron harmonic (0.22 THz) has been detected in the cw regime.
View Article and Find Full Text PDFBased on numerical simulations of a boundary problem, we study various scenarios of microwave soliton formation in the process of cyclotron resonance interaction of a short electromagnetic pulse with a counter-propagating initially rectilinear electron beam taking into account the relativistic dependence of the cyclotron frequency on the electrons' energy. When a certain threshold in the pulse energy is exceeded, the incident pulse can propagate without damping in the absorbing beam, similar to the effect of self-induced transparency in optics. However, mutual motion of the wave and electrons can lead to some novel effects.
View Article and Find Full Text PDFAn up to 15 T pulsed magnetic field generator in a volume of a few cubic centimeters has been developed for experiments with magnetized laser plasma. The magnetic field is created by a pair of coils placed in a sealed reservoir with liquid nitrogen, installed in a vacuum chamber with a laser target. The bearing body provides the mechanical strength of the system both in the case of co-directional and oppositely connected coils.
View Article and Find Full Text PDFObjectives: Most of human papillomavirus (HPV) infections are "cleared" by the immune system; however, in cases of immune system suppression, infections could lead to development of malignancies. The aim of this study was to find out the frequency of HR-HPV infection in early period after renal transplantation in recipients receiving immunosuppressive therapy and to follow the progression of the infection up to one year.
Methods: 43 female renal transplant recipients and 79 healthy female individuals as a control group were enrolled in this investigation.