The study objective is to analyze our experience of corporoplasty for Peyronie’s disease with a focus on the patients’ satisfaction with longterm results, as well as summation of literature data on ...this problem.Materials and methods. In this article we describe the long-term outcomes of various types of corporoplasty in 342patients treated for Peyronie’s disease.Results. It was established that a specific proportion of patients who underwent corporoplasty have no regular sexual activity after long-term follow-up (n = 50; 14.6 %). The common causes for absence of sexual activity in our sample included consequences of prostate cancer treatment (n = 17; 34 %), severe erectile dysfunction of other etiology (n = 11; 22 %) and lack of sexual partner (n = 22; 44 %).Сonclusion. Surgical treatment of Peyronie’s disease demonstrates high efficacy and safety in most cases. Despite concerns of possible impairment of erectile function, substitutive corporoplasty is characterized by a high level of patient satisfaction with the results of the surgery.
The hysteretic dependences of the magnetoresistance of porous (38% of the theoretical density) granular high-temperature superconductor (HTSC) Bi
1.8
Pb
0.3
Sr
1.9
Ca
2
Cu
3
O
x
have been analyzed in ...the model of the effective intergranular field. This effective field has been defined by the superposition of the external field and the field induced by magnetic moments of superconducting grains. The magnetic flux compression in an intergranular medium, characterized by the effective field, controls the hysteretic behavior of the magnetoresistance. It has been found that the magnetoresistance hysteresis width for the studied porous HTSC depends on the transport current, in contrast to the superconductor of the same composition with high physical density (more than 90% of the theoretical value). For a porous superconductor, a significant current concentration occurs in the region of the grain boundaries, which is caused by features of its microstructure. A current-induced increase in the effective boundary length results in a decrease in the flux compression, a decrease in the effective field in the intergranular medium, and a magnetoresistance hysteresis narrowing with increasing current.
The magnetization of porous Bi
1.8Pb
0.3Sr
2Ca
2Cu
3O
x
has been investigated. The experimental magnetization hysteretic loops of
M(
H) were described in the frames of Val’kov–Khrustalev model ...developed for type II granular superconductors.
The magnetic structure of the epsilon-Fe.sub.2O.sub.3 iron oxide polymorphic modification is collinear ferrimagnetic in the range from room temperature to ~150 K. As the temperature decreases, ...epsilon-Fe.sub.2O.sub.3 undergoes a magnetic transition accompanied by a significant decrease in the coercivity H.sub.c and, in the low-temperature range, the compound has a complex incommensurate magnetic structure. We experimentally investigated the dynamic magnetization switching of the epsilon-Fe.sub.2O.sub.3 nanoparticles with an average size of 8 nm in the temperature range of 80-300 K, which covers different types of the magnetic structure of this iron oxide. A bulk material consisting of xerogel SiO.sub.2 with the epsilon-Fe.sub.2O.sub.3 nanoparticles embedded in its pores was examined. The magnetic hysteresis loops under dynamic magnetization switching were measured using pulsed magnetic fields H.sub.max of up to 130 kOe by discharging a capacitor bank through a solenoid. The coercivity Ð.sub.Ñ upon the dynamic magnetization switching noticeably exceeds the Ð.sub.Ñ value under the quasi-static conditions. This is caused by the superparamagnetic relaxation of magnetic moments of particles upon the pulsed magnetization switching. In the range from room temperature to ~ 150 K, the external field variation rate dH/dt is the main parameter that determines the behavior of the coercivity under the dynamic magnetization switching. It is the behavior that is expected for a system of single-domain ferro- and ferrimagnetic particles. Under external conditions (at a temperature of 80 K) when the epsilon-Fe.sub.2O.sub.3 magnetic structure is incommensurate, the coercivity during the pulsed magnetization switching depends already on the parameter dH/dt and is determined, to a great extent, by the maximum applied field H.sub.max. Such a behavior atypical of systems of ferrimagnetic particles is caused already by the dynamic spin processes inside the epsilon-Fe.sub.2O.sub.3 particles during fast magnetization switching.
The experimental results of the effect of the magnetic field (up to 60kOe) on the broadening of the resistive transition of bulk composites Y3/4Lu1/4Ba2Cu3O7 (YBCO)+CuO are presented. These ...composites represent the network of the tunnel-type Josephson junctions where the copper oxide acts as a material forming barriers between YBCO crystallites. The mechanisms responsible for broadening of the resistive transition under magnetic field are discussed. The analysis of experimental R(T) dependences have shown that in the low field range 0–102Oe, the R(T) dependences are described well by the Ambegaokar–Halperin (AH) model. In the range 103–6×104Oe, the dissipation follows Arrhenius law R∼exp(−U(H)/kBT) characteristic for thermally activated flux creep model. In the range H∼102–103, the crossover from AH to flux creep dissipation mechanisms occurs.
The Fe.sub.3O.sub.4/CoFe.sub.2O.sub.4 nanoparticles with a core-shell structure with an average size of 5 nm have been obtained by codeposition from the iron and cobalt chloride solutions. An ...analysis of the magnetic properties of the obtained system and their comparison with the data for single-phase Fe.sub.3O.sub.4 (4 nm) and CoFe.sub.2O.sub.4 (6 nm) nanoparticles has led to the conclusion about a noticeable interaction between the soft magnetic (Fe.sub.3O.sub.4) and hard magnetic (CoFe.sub.2O.sub.4) phases forming the core and shell of hybrid particles.
The structural, thermal, static magnetic, and resonance properties of the low-dimensional NaCuFe.sub.2(VO.sub.4).sub.3 compound obtained by the solid-phase synthesis have been investigated. In the ...temperature range of 110-300 K, the electron spin resonance in the X band with a g factor of 2.008 has been detected. The magnetic properties of a sample with a high frustration level in the paramagnetic, antiferromagnetic, and disordered states have been examined. A shift of the Néel temperature to the high-temperature region in an external magnetic field has been observed. The origin of the disordered magnetism in NaCuFe.sub.2(VO.sub.4).sub.3 are discussed. The features of substitution of sodium for lithium on the physical properties of the ACuFe.sub.2(VO.sub.4).sub.3 (A = Na, Li) system have been established. It is shown that the chemical pressure changes the crystal lattice parameters, spacings between magnetic ions, and crystallite size, which is reflected in the physical properties of the material.
The results of the experimental investigation into the magnetic hysteresis of systems of superparamagnetic ferrihydrite nanoparticles of bacterial origin have been presented. The hysteresis ...properties of these objects are determined by the presence of an uncompensated magnetic moment in antiferromagnetic nanoparticles. It has been revealed that, under the conditions of cooling in an external magnetic field, there is a shift of the hysteresis loop with respect to the origin of the coordinates. These features are associated with the exchange coupling of the uncompensated magnetic moment and the antiferromagnetic “core” of the particles, as well as with processes similar to those responsible for the behavior of minor hysteresis loops due to strong local anisotropy fields of the ferrihydrite nanoparticles.
Composite materials fabricated by annealing of nonsuperconducting ceramics La
2
CuO
4
and La
1.56
Sr
0.44
CuO
4
at 910 °C during various time are investigated. Areas of superconducting La
1.85
Sr
...0.15
CuO
4
phase arises at boundaries of contacting nonsuperconducting granules. The volume fraction of the superconducting phase increases with increasing annealing time. A model describing the magnetic and transport properties of the samples at low magnetic fields is constructed. The magnetotransport characteristics of obtained samples at low magnetic fields (∼ 100 Oe) are defined by weak links network formed by superconducting areas. At high fields, behavior of the system is defined by a magnetization of the disconnected superconducting islands. The average size of the superconducting areas has been estimated from an extended critical state model.
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