Multi-pomeron exchange model for pppp and ppˉp\bar{p} collisions at ultra-high energy

A new variant of the effective pomeron exchange model is proposed for the description of the correlation, observed in $pp$ and $p\bar{p}$ collisions at center-of-mass energy from SPS to LHC, between mean transverse momentum and charged particles multiplicity. The model is based on the Regge-Gribov approach. Smooth logarithmic growth with the collision energy was established for the parameter k, the mean rapidity density of charged particles produced by a single string. It was obtained in the model by the fitting of the available experimental data on charged particles rapidity density in $pp$ and $p\bar{p}$ collisions. The main effect of the model, a gradual onset of string collectivity with the growth of collision energy, is accounted by a free parameter {\beta} that is responsible in an effective way for the string fusion phenomenon. Another free parameter, t, is used to define string tension. We extract parameters {\beta} and t from the available experimental results on -multiplicity correlation at nucleon collision energy $\sqrt{s}$ from 17 GeV to 7 TeV. Smooth dependence of both {\beta} and t on energy allows to make predictions for the correlation behavior at the collision energy of 14 TeV. The indications to the string interaction effects in high multiplicity events in $pp$ collisions at the LHC energies are also discussed.Comment: 7 pages, 7 figures, to appear in proc. QFTHEP'201

A New Method for Non-Invasive Surgery in Ophthalmology

The article's abstract is no available

Conformal Cyclic Cosmology Signatures and Anomalies of the CMB Sky

Circles of low-variance and Hawking points in the Cosmic Microwave Background (CMB), resulting from black hole mergers and black hole evaporation, respectively, in a previous cycle of the universe, have been predicted as possible evidence for the Conformal Cyclic Cosmology model (CCC) introduced by R. Penrose. We present a high-resolution search for such low-variance circles in the Planck and WMAP CMB data, and introduce HawkingNet, our machine learning open-source software based on a ResNet18 algorithm, to search for Hawking points in the CMB. We find that CMB anomalies, consisting of a few bright pixels, erroneously lead to regions with many low-variance circles, and consequently sets of concentric low-variance circles, when applying the search criteria used in previous work [V.G. Gurzadyan, R. Penrose]. After removing the anomalies from the data no statistically significant low-variance circles can be found. Concerning Hawking points, also no statistically significant evidence is found when using a Gaussian temperature amplitude model over 1 degree opening angle and after accounting for CMB anomalies. That CMB anomalies themselves might be remnants of Hawking points is not supported by low-variance and/or low-temperature circles around them. The absence of such statistically-significant distinct features in the currently available CMB data does not disprove the CCC model but implies that higher resolution CMB data and/or refined CCC based predictions are needed to pursue the search for CCC signatures.Comment: prepared for JCAP rev

Recommended conventions for reporting results from direct dark matter searches

The field of dark matter detection is a highly visible and highly competitive one. In this paper, we propose recommendations for presenting dark matter direct detection results particularly suited for weak-scale dark matter searches, although we believe the spirit of the recommendations can apply more broadly to searches for other dark matter candidates, such as very light dark matter or axions. To translate experimental data into a final published result, direct detection collaborations must make a series of choices in their analysis, ranging from how to model astrophysical parameters to how to make statistical inferences based on observed data. While many collaborations follow a standard set of recommendations in some areas, for example the expected flux of dark matter particles (to a large degree based on a paper from Lewin and Smith in 1995), in other areas, particularly in statistical inference, they have taken different approaches, often from result to result by the same collaboration. We set out a number of recommendations on how to apply the now commonly used Profile Likelihood Ratio method to direct detection data. In addition, updated recommendations for the Standard Halo Model astrophysical parameters and relevant neutrino fluxes are provided. The authors of this note include members of the DAMIC, DarkSide, DARWIN, DEAP, LZ, NEWS-G, PandaX, PICO, SBC, SENSEI, SuperCDMS, and XENON collaborations, and these collaborations provided input to the recommendations laid out here. Wide-spread adoption of these recommendations will make it easier to compare and combine future dark matter results

ІНСТИТУЦІЙНИЙ РОЗВИТОК ВИЩОГО МЕДИЧНОГО НАВЧАЛЬНОГО ЗАКЛАДУ ЯК ОСНОВА ЗАБЕЗПЕЧЕННЯ ЯКОСТІ ВИЩОЇ МЕДИЧНОЇ ОСВІТИ

The aim of the study – to present the experience of Kharkiv Medical Academy of Postgraduate Medical Education in resource potential and environmental factors usage for capacity building and postgraduate medical education quality providing.The main body. Activity of KhMAPE as the organization of effective interaction with objects in the external environment is represented. It includes providing demand for educational services, the creation of educational environment that enriched with information, increasing resource potential and creation of a exible management system. These institutional changes have caused the necessity of the development, discussion and approval of the project target of KhMAPE. Its realization is going to provide discovery and characterize up-coming transition of educational institution.Conclusion. The institutional changes are manifested in staff development, creative implementation of educational objectives, full use of the resource potential, the attraction of additional resources.Мета роботи – висвітлення й обґрунтування досвіду Харківської медичної академії післядипломної освіти щодо використання власного ресурсного потенціалу та факторів зовнішнього середовища для інституційного розвитку і забезпечення якості післядипломної медичної освіти.Основна частина. Представлена діяльність ХМАПО щодо організації ефективної взаємодії з об’єктами зовнішнього середовища, забезпечення попиту на освітні послуги, створення інформаційно збагаченого освітнього середовища, нарощування ресурсного потенціалу та створення гнучкої системи управління.Такі інституційні зміни зумовили необхідність розробки, обговорення та затвердження цільового проекту розвитку ХМАПО, реалізація якого забезпечить отримання позитивного результату та характеризує перехід навчального закладу на вищий щабель діяльності.Висновок. Інституційні зміни виявляються у підвищенні кваліфікації персоналу, творчій реалізації освітніх завдань, у повному використанні ресурсного потенціалу, залученні додаткових ресурсів

Rehabilitation of patients after surgical treatment of forearm fractures

Проведено обследование 28 пациентов с переломами 43 костей предплечия. Лечение было проведено оперативными методами, а именно: накостный (18) и чрезкостный (10) остеосинтез. Для чрезкостного остеосинтеза использовался разработанное авторами устройство на стержневой основе, особенности конструкции устройства позволяют сохранить ротационную функцию предплечия и смежных суставов. В результате исследования разработан комплекс реабилитационных мероприятий, которые способствуют восстановлению функций поврежденной верхней идетельствуют об эффективности разработанных авторами оперативных и реабилитационных мер.Проведено обстеження 28 хворих з переломами 43 кісток передпліччя, що лікувалися оперативними методиками: накістковий остеосинтез (18) та черезкістковий (10). Серед оперативних методик застосовано черезкістковий остеосинтез розробленим нами пристроєм на стержневій основі, конструкція якого дозволяє зберегти ротаційну функцію передпліччя та суміжних суглобів. У результаті дослідження розроблено комплекс реабілітаційних заходів, що сприяє відновленню функції ушкодженої верхньої кінцівки. Позитивні результати дослідження свідчать про ефективність розроблених нами оперативних і реабілітаційних заходів.The aim of our investiqution was to evaluate the effectiveness of the rehabilitating complex, devoted to prophylaxis of complications and restoration of damaged forearm after transbone and external fixation of bone fragments. There were 28 patients in the age from 25 to 57 y.o. with diaphysial fractures of 43 bones of forearm. 18 were men, 10 - women, mean age 30 ± 2,4 years. Patients with fractures of both bones of forearm constituted 53,6%, isolated fractures of os radius 28,6%, os ulnae - 17,8%. According to international classification AO/ASIF transversal (type A) diaphysial fractures of forearm were in 23 (53,5%) of patients, clinoid (type B) - in 11 (25,6%)), compound (type C) - in 9 (20,9%). With the purpose to evaluate the effectiveness of used methods we made analysis of results among two groups of patients. First (control) group constituted 18 patients. In them external fixation with different plates was provided. Two (basis) group - in ten cases shaft apparatus for external fixation of our construction was used. Usage of this shaft apparatuses allowed proper fixation of os ulnae and os radius independently with preservation of function in elbow joint. Rehabilitation treatment was dedicated to prophylaxis of complications, restoration of joint and muscles function, return to professional activity. Rehabilitation measures in patients we divided into three stages coordinate performed observing its methodological principles such as - early start, continuity and compressive treatment measures. Comparison of functional results of treatment of diaphysial fractures of forearm has shown, that transbone osteosynthesis done with our apparatus has advantages comparably to other methods what gave good results in 96,9%o (basis group) and 92,4% (control group)

Projected sensitivity of the LUX-ZEPLIN experiment to the two-neutrino and neutrinoless double β decays of Xe 134

The projected sensitivity of the LUX-ZEPLIN (LZ) experiment to two-neutrino and neutrinoless double β decay of Xe134 is presented. LZ is a 10-tonne xenon time-projection chamber optimized for the detection of dark matter particles and is expected to start operating in 2021 at Sanford Underground Research Facility, USA. Its large mass of natural xenon provides an exceptional opportunity to search for the double β decay of Xe134, for which xenon detectors enriched in Xe136 are less effective. For the two-neutrino decay mode, LZ is predicted to exclude values of the half-life up to 1.7×1024 years at 90% confidence level (CL) and has a three-sigma observation potential of 8.7×1023 years, approaching the predictions of nuclear models. For the neutrinoless decay mode LZ, is projected to exclude values of the half-life up to 7.3×1024 years at 90% CL

Cosmogenic production of {37}^Ar in the context of the LUX-ZEPLIN experiment

We estimate the amount of {37}^Ar produced in natural xenon via cosmic-ray-induced spallation, an inevitable consequence of the transportation and storage of xenon on the Earth’s surface. We then calculate the resulting {37}^Ar concentration in a 10-tonne payload (similar to that of the LUX-ZEPLIN experiment) assuming a representative schedule of xenon purification, storage, and delivery to the underground facility. Using the spallation model by Silberberg and Tsao, the sea-level production rate of {37}^Ar in natural xenon is estimated to be 0.024 atoms/kg/day. Assuming the xenon is successively purified to remove radioactive contaminants in 1-tonne batches at a rate of 1 tonne/month, the average {37}^Ar activity after 10 tons are purified and transported underground is 0.058 - 0.090 μ Bq/kg, depending on the degree of argon removal during above-ground purification. Such cosmogenic {37}^Ar will appear as a noticeable background in the early science data, while decaying with a 35-day half-life. This newly noticed production mechanism of {37}^Ar should be considered when planning for future liquid-xenon-based experiments