Observation of narrow baryon resonance decaying into pKs0pK^0_s in pA-interactions at 70GeV/c70 GeV/c with SVD-2 setup

SVD-2 experiment data have been analyzed to search for an exotic baryon state, the $\Theta^+$-baryon, in a $pK^0_s$ decay mode at $70 GeV/c$ on IHEP accelerator. The reaction $pA \to pK^0_s+X$ with a limited multiplicity was used in the analysis. The $pK^0_s$ invariant mass spectrum shows a resonant structure with $M=1526\pm3(stat.)\pm 3(syst.) MeV/c^2$ and $\Gamma < 24 MeV/c^2$. The statistical significance of this peak was estimated to be of $5.6 \sigma$. The mass and width of the resonance is compatible with the recently reported $\Theta^+$- baryon with positive strangeness which was predicted as an exotic pentaquark ($uudd\bar{s}$) baryon state. The total cross section for $\Theta^+$ production in pN-interactions for $X_F\ge 0$ was estimated to be $(30\div120) \mu b$ and no essential deviation from A-dependence for inelastic events $(\sim A^{0.7})$ was found.Comment: 8 pages, 7 figures, To be submitted to Yadernaya Fizika. v3-v5 - Some references added, minor typos correcte

Properties of Neutral Charmed Mesons in Proton--Nucleus Interactions at 70 GeV

The results of treatment of data obtained in the SERP-E-184experiment "Investigation of mechanisms of the production of charmed particles in proton-nucleus interactions at 70 GeV and their decays" by irradiating the active target of the SVD-2 facility consisting of carbon, silicon, and lead plates, are presented. After separating a signal from the two-particle decay of neutral charmed mesons and estimating the cross section for charm production at a threshold energy {\sigma}(c\v{c})=7.1 \pm 2.4(stat.) \pm 1.4(syst.) \mub/nucleon, some properties of D mesons are investigated. These include the dependence of the cross section on the target mass number (its A dependence); the behavior of the differential cross sections d{\sigma}/dpt2 and d{\sigma}/dxF; and the dependence of the parameter {\alpha} on the kinematical variables xF, pt2, and plab. The experimental results in question are compared with predictions obtained on the basis of the FRITIOF7.02 code.Comment: 9 pages, 9 figures,3 table

Remarkable hydrostatic piezoelectric response of novel 2–0–2 composites

This is the first study of the significant influence of the 0–3 ceramic / polymer layer on the hydrostatic piezoelectric parameters of novel 2–0–2 relaxor-ferroelectric single crystal / ferroelectric ceramic / polymer composites. Examples of the performance of two 2–0–2 composites based on domain-engineered single crystals are analysed by taking into account the elastic anisotropy of the 0–3 ceramic/polymer layers with changes in the volume fraction of ceramic inclusions and their aspect ratio. The unique feature of the hydrostatic properties of the studied 2–0–2 composites consists in their large values of piezoelectric coefficients d*h ≈ 1 nC/N and e*h ≈ 20 C/m2, squared figure of merit d*hg*h∼ 10−10 Pa−1, and electromechanical coupling factor k*h ≈ 0.7.</p

CLOUD: an atmospheric research facility at CERN

This report is the second of two addenda to the CLOUD proposal at CERN (physics/0104048), which aims to test experimentally the existence a link between cosmic rays and cloud formation, and to understand the microphysical mechanism. The document places CLOUD in the framework of a CERN facility for atmospheric research, and provides further details on the particle beam requirements

Addendum to the CLOUD proposal

This report is the first of two addenda to the CLOUD proposal at CERN (physics/0104048), which aims to test experimentally the existence a link between cosmic rays and cloud formation, and to understand the microphysical mechanism. The document provides further details on the detector design, scientific motivation and experimental programme

Comorbidity of tics and epilepsy in children and adolescents

Tics are the most common forms of hyperkinesis among children and adolescents, the etiology of which is not fully clear. A study has shown a high comorbidity of tic disorders and epilepsy, as evidenced by video-EEG monitoring. In patients with tics even in the absence of epileptic seizures, epileptiform activity is an adverse predictor and a determinant of the potential risk of comorbid epilepsy especially during neuroleptic therapy. Antiepileptic drugs are the drugs of choice to treat this category of patients

Дослідження безпосередніх та віддалених результатів комплексного лікування хворих з місцево-розповсюдженим раком молочної залози з використанням системної та ендолімфатичної поліхіміотерапії в неоад'ювантному режимі

Мета. Порівняти безпосередні та віддалені результати лікування хворих з місцево-розповсюдженим раком молочної залози (МР РМЗ) з використанням різних способів введення препаратів поліхіміотерапії (ПХТ). Матеріали і методи. Дослідження проведено на основі вибіркового аналізу медичних карт 112 стаціонарних хворих з МР РМЗ стадії T4A-DN0-3M0, які отримували комплексне протипухлинне лікування на базі Донецького обласного протипухлинного центру та Університетської клініки Одеського національного медичного університету в 2000 - 2017 рр. До контрольної групи увійшли 65 (58%) пацієнток з неоперабельними формами МР РМЗ, яким у неоад’ювантному режимі була проведена системна ПХТ (СПХТ). До досліджуваної групи увійшли 47 (42%) пацієнток з неоперабельними формами МР РМЗ, яким як неоад’ювантний курс була проведена ендолімфатична ПХТ (ЕЛПХТ). Результати. За показниками три- та пۥятирічної виживаності між контрольною і досліджуваною групами не було статистично значущої відмінності. Безпосередні результати лікування пацієнток, яким проведена ЕЛПХТ у неоад’ювантому режимі, кращі, ніж результати лікування пацієнток, яким проведена СПХТ, без статистично значущої переваги. Висновки. Безпосередні і віддалені результати комплексного лікування МР РМЗ у разі несприятливого прогнозу пухлинного росту з проведенням ЕЛПХТ у неоад'ювантному режимі і виконанням радикального оперативного втручання кращі в порівнянні з результатами лікування за аналогічною схемою, але з проведенням СПХТ на передопераційному етапі, без статистично значущої переваги

Application of marker of proliferative activity Ki-67 for analysis of efficacy in complex treatment of patients, suffering locally-spread mammary gland cancer

Objective. Application of the proliferative activity marker Ki-67 for analysis of the results of neoadjuvant polychemotherapy, using regional or systemic ways of delivery of pharmacological preparations, for the patients, suffering locally spread mammary gland cancer (LS MGC). Materials and methods. Retrospective analysis of the data, concerning 90 women-patients, suffering LS MGC, who obtained complex treatment, based on regional and systemic ways of the preparations administration. Results. Dynamics of proliferative activity of a LS MGC as a result of neoadjuvant polychemotherapy, analyzed by the Ki-67 level determination, have demonstrated a statistically significant advantage of regional ways of the preparation injection, comparing with systemic ways of administration. Correlation of tumoral metastatic potential with level of Ki-67 was revealed, using detailed investigation. Conclusion. It is possible to estimate tumoral proliferative activity and the neoadjuvant polychemotherapy efficacy, using Ki-67 analysis, and in such a way to select the optimal tactics of complex treatment

The role of sunflower crops in maintaining the biodiversity of hymenopterous insects in agrocenoses of Krasnodar Territory

Aim. To study the species composition and abundance of anthophilic Hymenopteran insects in the sunflower agrocenosis and the role of its flowers in maintaining biodiversity in the agrocenoses of the Krasnodar Territory. Material and Methods. The studies were conducted during the sunflower growing season in the Krasnodar Territory from 2017 to 2022 in the Kanevsky, Krasnoarmeysky, Krylovsky, Labinsky, Ust‐Labinsky, Tbilisi and Temryuk districts.Results. In sunflower agrocenoses, 53 species of stinging hymenopteran insects from 10 families are found. For each research area, there is an individual insect fauna, which is characteristic of the agrocenosis and actively visits sunflower flowers. The fauna of each district includes mass species, common and rare, most of which are not interested in sunflower flowers, using other resources. The main visitors of sunflower inflorescences are bumblebees, which in a range of circumstances may visit flowers. Most wasp species are casual visitors to sunflower flowers.Conclusion. Most widely represented in the sunflower agrocenosis are insects of the families Halictidae, Andrenidae, Megachilidae, Apidae. In each research area, there are individual situations when common insect species either visit sunflower flowers or completely ignore them. Combining information on all areas, we observe that in the case of certain local conditions, almost all representatives of the fauna can feed on sunflowers, but it is not the principal resources, only complementing the wild flora