16 research outputs found
The overdamped chiral magnetic wave
About eight years ago it was predicted theoretically that a charged chiral
plasma could support the propagation of the so-called chiral magnetic waves,
which are driven by the anomalous chiral magnetic and chiral separation
effects. This prompted intensive experimental efforts in search of signatures
of such waves in relativistic heavy-ion collisions. In fact, several
experiments have already reported a tentative detection of the predicted
signal, albeit with a significant background contribution. Here, we critically
reanalyze the theoretical foundations for the existence of the chiral magnetic
waves. We find that the commonly used background-field approximation is not
sufficient for treating the waves in hot chiral plasmas in the long-wavelength
limit. Indeed, the back-reaction from dynamically induced electromagnetic
fields turns the chiral magnetic wave into a diffusive mode. While the
situation is slightly better in the strongly-coupled near-critical regime of
quark-gluon plasma created in heavy-ion collisions, the chiral magnetic wave is
still strongly overdamped due to the effects of electrical conductivity and
charge diffusion.Comment: 16 pages, 2 figures. v2: the numerical values of the electrical
conductivity are corrected and the results are extended to higher values of
the magnetic field. Proceedings of "XIII Quark Confinement and the Hadron
Spectrum - Confinement2018", 31 July - 6 August 2018, Maynooth University,
Irelan
Determination of Growth Rate of Phases during Phase Transformation in R2Fe14B Type Alloy
The kinetics of hydrogen-induced phase transformation in R2Fe14B type hard magnetiс alloy has been analyzed in the framework of the Kolmogorov’s kinetic model. On the basis of the kinetic theory of Kolmogorov phase transformations has been establisged the dependence of the rate growth of new phases during hydrogen-induced phase transformations in R2Fe14B type in dependence on hydrogen pressure during the transformation.Кинетика индуцированного водородом прямого фазового превращения в магнитотвердом сплаве R2Fe14B проанализирована в рамках кинетической модели Колмогорова. На основе кинетической теории фазовых превращений Колмогорова установлена зависимость скорости роста новых фаз в ходе фазовых превращений в сплаве типа R2Fe14B в зависимости от давления водорода при превращении
Ectopic pregnancy in the uterus scar left after cesarean section: a clinical case
The article describes a rare clinical case of ectopic pregnancy in the uterine scar left after a cesarean section. The case demonstrates the complexity of diagnosing this abnormality and managing such patients. The proposed approach allowed us to diagnose pregnancy in the uterus scar in due time, avoid hysterectomy, and preserve the reproductive organ
Clinical case of ectopic pregnancy in the fallopian tube stump
Here we describe a rare clinical case of female with a history of surgical sterilization coupled to ectopic pregnancy in the fallopian tube stump, comprising on average 1.19 % of total ectopic pregnancies. The patient E. was admitted to the gynecological department complaining of aching pain in the lower left abdominal quadrant, blood discharge from the genital tract, and delayed menstruation. Due to a previous operation for sterilization, no onset of pregnancy was expected. A positive urinary test for human chorionic gonadotropin was obtained, whereas ultrasound examination did not reliably confirm the onset of pregnancy. However, taking into account the ultrasound signs of the hematoperitoneum, a culdocentesis was performed that revealed dark liquid non-clotting blood. Laparoscopic surgery was performed on emergency indications. Intraoperatively: the stump of the left fallopian tube was dilated, cyanotic, and blood was leaking from the fimbria lend. Bilateral excision of fallopian tube stumps was performed. The primary clinical diagnosis was interrupted left-sided tubal pregnancy (in the fallopian tube stump) that was confirmed by pathomorphological examination. Thus, the clinical case described by us demonstrates properly conducted differential diagnostics as well as timely management and therapeutic interventions. Hence, previous surgical sterilization recorded in patient history should not rule out a diagnosis of ectopic pregnancy