Magnetoelectric Effect in Amorphous Ferromagnetic FeCoSiB/Langatate Monolithic Heterostructure for Magnetic Field Sensing.

This paper investigates the possibilities of creating magnetic field sensors using the direct magnetoelectric (ME) effect in a monolithic heterostructure of amorphous ferromagnetic material/langatate. Layers of 1.5 μm-thick FeCoSiB amorphous ferromagnetic material were deposited on the surface of the langatate single crystal using magnetron sputtering.

Magnetoelectric MEMS Magnetic Field Sensor Based on a Laminated Heterostructure of Bidomain Lithium Niobate and Metglas.

Non-contact mapping of magnetic fields produced by the human heart muscle requires the application of arrays of miniature and highly sensitive magnetic field sensors. In this article, we describe a MEMS technology of laminated magnetoelectric heterostructures comprising a thin piezoelectric lithium niobate single crystal and a film of magnetostrictive metglas. In the former, a ferroelectric bidomain structure is created using a technique developed by the authors.

Self-Biased Bidomain LiNbO/Ni/Metglas Magnetoelectric Current Sensor.

The article is devoted to the theoretical and experimental study of a magnetoelectric (ME) current sensor based on a gradient structure. It is known that the use of gradient structures in magnetostrictive-piezoelectric composites makes it possible to create a self-biased structure by replacing an external magnetic field with an internal one, which significantly reduces the weight, power consumption and dimensions of the device. Current sensors based on a gradient bidomain structure LiNbO (LN)/Ni/Metglas with the following layer thicknesses: lithium niobate-500 μm, nickel-10 μm, Metglas-29 μm, operate on a linear section of the working characteristic and do not require the bias magnetic field.

Low-Frequency Vibration Sensor with a Sub-nm Sensitivity Using a Bidomain Lithium Niobate Crystal.

We present a low-frequency sensor for the detection of vibrations, with a sub-nm amplitude, based on a cantilever made of a single-crystalline lithium niobate (LiNbO₃) plate, with a bidomain ferroelectric structure. The sensitivity of the sensor-to-sinusoidal vibrational excitations was measured in terms of displacement as well as of acceleration amplitude. We show a linear behavior of the response, with the vibrational displacement amplitude in the entire studied frequency range up to 150 Hz.

Rhenium ion beam for implantation into semiconductors.

At the ion source test bench in Institute for Theoretical and Experimental Physics the program of ion source development for semiconductor industry is in progress. In framework of the program the Metal Vapor Vacuum Arc ion source for germanium and rhenium ion beam generation was developed and investigated. It was shown that at special conditions of ion beam implantation it is possible to fabricate not only homogenous layers of rhenium silicides solid solutions but also clusters of this compound with properties of quantum dots.

HLA antigens in borderline and essential hypertension.

The subject of investigation was the comparison of HLA antigen distribution in people with borderline hypertension (BH) and essential hypertension (EH). One hundred twenty-one men with BH and 60 men with EH were studied. The HLA frequency was compared with that in 858 healthy men, who were blood donors.

[HLA antigens in patients with different forms of arterial hypertension].

The authors analyze the frequency of HLA [correction of HIA] antigens in 121 male patients with borderline arterial hypertension and in 60 patients with hypertensive disease, stage II. The frequency of HLA [correction of HIA] antigens in these patients was compared with their frequency in the male population of Leningrad inhabitants (858 healthy donors). Patients with borderline arterial hypertension showed a characteristic increase of the frequency of B16, B18 CW4 antigens.

[Effects of bromocriptine on catecholamine metabolism in subjects with borderline arterial hypertension].

Effects of bromocriptine on hemodynamics and catecholamine exchange were evaluated in patients with borderline arterial hypertension with respect to their family history. The agent was shown to be able to bring down blood pressure and decrease plasma catecholamine levels. With this, platelet monoamine oxidase activity was increased in persons with a family history of hypertensive disease.

[Interrelations of pulmonary and systemic hemodynamics in hypertension].

A comprehensive study of the systemic and pulmonary hemodynamics, performed in 198 hypertensive patients showed them to have reduced volume of blood circulating in the lungs due to enhanced postcapillary tone. Impairment of arterial blood flow in the lungs and development of pulmonary hypertension fail to keep pace with changes in the systemic circulation.

[Determination of the criteria for selecting the optimal obsidan and hypothiazide treatment regimen in hypertension based on mathematical modelling data].

Criteria for the choice of drug dosage are established. In mild changes of pulmonary hemodynamics in patients with hypertensive disease, minimum doses of hypothiazide are recommended, while treatment should be conducted with obsidan, for the main part. In considerable attendant disorders of pulmonary hemodynamics the dose of hypothiazide should be proportionally increased, while the dose of obsidan is reduced.

[Effect of static and dynamic physical loads on the hemodynamics in hypertension].

Patients with hypertensive disease and healthy individuals were examined. The examination showed the expediency of using dynamic and static physical exercises. The level of information concerning the reflex and energetic components of hemodynamic reactions to physical exercise grows in such cases.

[Clinical and experimental study of the hemodynamic effect of gemiton].

The effect of hemiton (clofelin) on the minute circulation volume, general peripheral resistance to the blood flow, and the mechanisms of the regulation of the vascular neurogenous tonus and heart activity was studied in patients in the clinic and in experiments. It is shown that the hemodynamic effect of the agent depends on the initial parameters of hemodynamics. It is assumed that hemiton influences the capacity of systemic circulation.

[Contractile activity of the myocardium in chronic coronary insufficiency].

Cardio- and hemodynamics was investigated in 69 patients with chronic coronary insufficiency without manifestations of cardiac decompensation and with symptoms of congestive incompetence of the heart by using radiocardiography and analyzing systolic phases of the left ventricle. Furthermore, fractional composition of myocardial proteins and the ATP-ase myosin activity were studied in 31 persons, who during their life-time suffered from ischemic heart disease. In patients presenting no symptoms of cardiac insufficiency significant changes in cardio- and hemodynamics along with a reduced content of the actomyosin complex proteins and their disturbed ATP-ase activity were uncovered.