Non-contractible loops in the dense O(n) loop model on the cylinder

A lattice model of critical dense polymers $O(0)$ is considered for the finite cylinder geometry. Due to the presence of non-contractible loops with a fixed fugacity $\xi$, the model is a generalization of the critical dense polymers solved by Pearce, Rasmussen and Villani. We found the free energy for any height $N$ and circumference $L$ of the cylinder. The density $\rho$ of non-contractible loops is found for $N \rightarrow \infty$ and large $L$. The results are compared with those obtained for the anisotropic quantum chain with twisted boundary conditions. Using the latter method we obtained $\rho$ for any $O(n)$ model and an arbitrary fugacity.Comment: arXiv admin note: text overlap with arXiv:0810.223

Production methods and physical and mechanical tests domestic ceramic materials based on zirconium dioxide from nanostructured powders

The aim is to develop a technology for the domestic ceramic microporous material based on zirconium dioxide stabilized with yttrium oxide and cerium. For experimental studies received four variants ceramic powder with various approaches to the synthesis process. The possibility of applying the material in prosthetic dentistry practice, substantiated by experimental studies of physical and mechanical properties. Zirconia powders were synthesized by using oxides of yttrium and cerium as stabilizers with different approaches when processed. According to the results of thermomechanical analysis of the parameters of the sintering conditions to 14500S, in which the density was 92% of the theoretical structure for Zr02-2,2mol% Y203-3m ol% Ce02. The greatest influence on the revitalization process of sintering, noted when using ammonia buffer and cryochemical processing. Using cryochemical processing and ammoniacal buffer solution composition on Zr02-2,2mol Y203-3m ol% Ce03% increases the hardness and fracture toughness of the samples at 19 and 22%, respectively. According to the Raman spectra, samples consisting of ceramic powder system Zr02-2,2mol% Y203-3m ol% Ce02, which was prepared by using ammonia buffer better crystallized, and monoclinic modification after heat treatment no.Целью исследования явилась разработка технологии получения отечественного керамического наноструктурированного материала на основе диоксида циркония, стабилизированного оксидами иттрия и церия. Для экспериментальных исследований получали четыре варианта керамического порошка с различными подходами в процессе синтеза. Возможность применения предложенного материала в практике ортопедической стоматологии обосновали экспериментальными исследованиями физико-механических свойств. Синтезированы порошки диоксида циркония с использованием оксидов иттрия и церия в качестве стабилизаторов с различными подходами при технологической обработке. По результатам термомеханического анализа определены параметры режима спекания до 14500С, при котором значение плотности составило 92% от теоретической для состава гг02-2.2мол%У203-Змол%Се02. Наибольшее влияние на процесс активизации спекания, отмечено при использовании аммиачного буферного раствора и криохимической обработки. Использование криохимической обработки и аммиачного буферного раствора на составе 2г02-2.2мол%У203-Змол%Се02 повышает твердость и трещиностойкость образцов на 19 и 22 % соответственно. По данным КР-спектров, образцы, состоящие из наноструктурированного керамического порошка системы гг02-2.2мол%У203-Змол%Се02, который получали с использованием аммиачного буфера лучше окристаллизованы, а моноклинная модификация после термообработки отсутствует

Efficacy of comprehensive dental treatment for lichenoid reactions of the mucoparodontal complex: A single-center pilot cohort study

Background. Lichenoid reactions of the oral mucosa are currently recognized as a serious issue for dentists of various specialties, since their knowledge and competence in the diagnosis and pathogenetic treatment of lichenoid lesions of the oral cavity are yet to be improved. Following the data on high oncogenic potential in some forms of lichenoid reactions of oral cavity mucous membranes, the issue should be given serious considerations, and dentists should keep oncology-related suspicion when receiving these patients.Objective. To evaluate the efficacy of comprehensive dental treatment for lichenoid reactions of the mucoparodontal complex.Methods. A single-center pilot cohort study was conducted to evaluate the efficacy of the comprehensive treatment (combination of pharmacotherapy and physiotherapy) of patients with lichenoid reactions of the oral mucosa. The observation group consisted of 49 patients (15 males, 34 females) aged 58.92 ± 0.82 years with verified diagnoses of oral mucosa lichenoid reactions. The suggested treatment included pharmacotherapy (highly-potent topical steroids, calcineurin inhibitors) and physiotherapy in the form of low level laser therapy (635 nm, 10 W) provided via Matrix laser (Matrix, Russia). Treatment efficacy was assessed by the total scale of treatment efficacy, registering indicators of the area of focal lesions and the severity of pain syndrome, as well as by changes in dental quality of life indicators according to OHIP-49-RU (Oral Health Impact Profile) in the Russian version. Statistical processing of the data involved Student’s t-test and Wilcoxon t-test. Differences were considered significant at p ≤ 0.05. Data statistical analysis was performed using SPSS 13.0 (SPSS Inc., USA).Results. During the follow-up period, the indicators of the total scale of treatment efficacy decreased significantly (p < 0.001) in 100% of patients and amounted (as medians and quartiles): 6.0 (4.0–7.0) points before treatment and 1.0 (1.0–2.0) points after treatment to be objectified by a significant reduction in the area of focal lesions (by 63.2%, p < 0.001) and in pain syndrome (spontaneous pain from 2.0 (1.5–3.0) points before treatment to 0.0 (0.0–1.0) points after treatment; induced pain from 3.0 (2.0–3.0) points to 1.0 (0.0–1.0) points). Along with the clinical improvement, the scores in dental quality of life improved from 83.11 ± 2.58 to 39.94 ± 0.86 points, according to OHIP-49 RU (Oral Health Impact Profile).Conclusion. Early detection and differentiation of lichenoid reactions in oral mucous membranes ensure timely treatment using the developed protocol of comprehensive treatment (combination of pharmacotherapy and physiotherapy). The efficacy of the protocol was confirmed clinically and justified in relation to quality of life

The characteristic of reaction of biological tissues of animals to implantation of the samples from dioxide of zirconium received with use of various technological approaches

The aim of the study was to determine experimentally the reaction of biological tissues of animals and a comparison of data on the effect of four kinds of samples stabilized zirconia and various additives prepared using different technological approaches. Samples implanted into a muscle of a hip of an animal and in 10,20 and 40 days after operation investigated a condition of muscular tissue, salivary glands, a liver, a spleen, a kidney, a cerebral cortex and the regionarnykh of lymph nodes. Data of histologic supervision show that for practical use in medicine the most rational is use of dioxide of the zirconium stabilized by oxide of yttrium or dioxide of cerium. As changes in bodies of animals with the implanted samples of dioxide of the zirconium stabilized by oxide of aluminum remain twice more long and don't come to an end until the end of research terms.Целью исследования являлось определениев эксперименте реакции биологических тканей животных и проведение сравнения данных по влиянию четырех видов образцов диоксида циркония, стабилизированного различными добавками и полученного с помощью разных технологических подходов. Образцы имплантировали в мышцу бедра животного и через 10,20 и 40 суток после операции исследовали состояние мышечной ткани, слюнных желез, печени, селезенки, почки, коры головного мозга и регионарных лимфатических узлов. Данные гистологических наблюдений показывают, что для практического использования в медицине наиболее рациональным является применение диоксида циркония, стабилизированного оксидом иттрия или диоксидом церия. Так как изменения в органах животных с имплантированными образцами диоксида циркония, стабилизированного оксидом алюминия сохраняются в два раза дольше и не заканчиваются до конца сроков исследования

Possibilities of clinical use of designs based on zirconium dioxide, andevaluation of the main features of the new ceramic dental appointment

Every year, steadily increasing the quantity of patients, ortopedic treatment which is performed using structures made of zirconium dioxide. The interest of dentists to this method of replacing teeth and defects of dentition due to the fact that orthopedic constructions made of zirconium dioxide with the use of CAD I CAM technologies have high durability, aesthetics and precision. A method for the synthesis of nanocrystalline powder of Zr02, stabilizet with Y203, by co-deposition with the use of elements of the solgel technology for low temperature sintering. X-ray diffraction, thermal desorption of nitrogen, and electron microscopy study of powder characteristics, depending on synthesis conditions. Preclinical trials indicate the developed material meets the require ments of durability end aesthetics.С каждым годом, неуклонно увеличивается число пациентов, ортопедическое лечение которых проводится с использованием конструкций выполненных из диоксида циркония. Интерес стоматологов к данному методу замещения дефектов зубов и зубных рядов обусловлен тем, что ортопедические конструкции, изготовленные из диоксида циркония с применением CAD/CAM технологий обладают высокой прочностью, эстетичностью и прецензионностью. Разработана методика синтеза нанокристаллического порошка Zr02, стабилизированного Y203, методом совместного осаждения с применением элементов золь-гель технологии, для низкотемпературного спекания. Методами рентгеновской дифракции, тепловой десорбции азота и электронной микроскопии изучены характеристики порошка в зависимости от условий синтеза. Проведенные доклинические испытания свидетельствуют, что разработанный материал отвечает требованиям прочности и эстетичности

A facility to Search for Hidden Particles (SHiP) at the CERN SPS

A new general purpose fixed target facility is proposed at the CERN SPS accelerator which is aimed at exploring the domain of hidden particles and make measurements with tau neutrinos. Hidden particles are predicted by a large number of models beyond the Standard Model. The high intensity of the SPS 400~GeV beam allows probing a wide variety of models containing light long-lived exotic particles with masses below ${\cal O}$(10)~GeV/c$^2$, including very weakly interacting low-energy SUSY states. The experimental programme of the proposed facility is capable of being extended in the future, e.g. to include direct searches for Dark Matter and Lepton Flavour Violation.Comment: Technical Proposa

Morphological aspects of the issues in the treatment of chronic apical periodontitis

The purpose of the study - to evaluate the degree ot purification ot the deltoid branch of root canal during endodontic treatment of teeth. Morphological assessment of hard tissues of teeth 14 svezheudalennyh (incisors, premolars) in patients aged 24 - 56 years with a diagnosis - chronic apical periodontitis. Based on these data we recommend using the hydrodynamic method of irrigation of root canals 3% sodium hypochlorite solution using the apparatus «Rins Endo» in addition to the traditional endodontic treatment of patients with chronic apical periodontitis.Цель исследования - оценить степень очистки дельтовидных ответвлений корневого канала в процессе зндодонтического лечения зубов. Проведена морфологическая оценка состояния твердых тканей 14 удаленных зубов (резцы, премоляры) у пациентов в возрасте 24 - 56 лет с диагнозом - хронический апикальный периодонтит. На основании полученных данных рекомендуется использование гидродинамического метода ирригации корневых каналов зубов 3% раствором гипохлорита натрия с помощью аппарата «Rins Endo» дополнительно к традиционному эндодонтическому лечению пациентов с хроническими формами апикального периодонтита

Measurement of the Bs0→J/ψηB_{s}^{0} \rightarrow J/\psi \eta lifetime

Using a data set corresponding to an integrated luminosity of $3 fb^{-1}$, collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV, the effective lifetime in the $B^0_s \rightarrow J/\psi \eta$ decay mode, $\tau_{\textrm{eff}}$, is measured to be $\tau_{\textrm{eff}} = 1.479 \pm 0.034~\textrm{(stat)} \pm 0.011 ~\textrm{(syst)}$ ps. Assuming $CP$ conservation, $\tau_{\textrm{eff}}$ corresponds to the lifetime of the light $B_s^0$ mass eigenstate. This is the first measurement of the effective lifetime in this decay mode.Comment: All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-017.htm

Measurement of the mass and lifetime of the Ωb−\Omega_b^- baryon

A proton-proton collision data sample, corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by LHCb at $\sqrt{s}=7$ and 8 TeV, is used to reconstruct $63\pm9$ $\Omega_b^-\to\Omega_c^0\pi^-$, $\Omega_c^0\to pK^-K^-\pi^+$ decays. Using the $\Xi_b^-\to\Xi_c^0\pi^-$, $\Xi_c^0\to pK^-K^-\pi^+$ decay mode for calibration, the lifetime ratio and absolute lifetime of the $\Omega_b^-$ baryon are measured to be \begin{align*} \frac{\tau_{\Omega_b^-}}{\tau_{\Xi_b^-}} &= 1.11\pm0.16\pm0.03, \\ \tau_{\Omega_b^-} &= 1.78\pm0.26\pm0.05\pm0.06~{\rm ps}, \end{align*} where the uncertainties are statistical, systematic and from the calibration mode (for $\tau_{\Omega_b^-}$ only). A measurement is also made of the mass difference, $m_{\Omega_b^-}-m_{\Xi_b^-}$, and the corresponding $\Omega_b^-$ mass, which yields \begin{align*} m_{\Omega_b^-}-m_{\Xi_b^-} &= 247.4\pm3.2\pm0.5~{\rm MeV}/c^2, \\ m_{\Omega_b^-} &= 6045.1\pm3.2\pm 0.5\pm0.6~{\rm MeV}/c^2. \end{align*} These results are consistent with previous measurements.Comment: 11 pages, 5 figures, All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-008.htm

Study of J /ψ production in Jets

The production of J/ψ mesons in jets is studied in the forward region of proton-proton collisions using data collected with the LHCb detector at a center-of-mass energy of 13 TeV. The fraction of the jet transverse momentum carried by the J/ψ meson, z(J/ψ)≡pT(J/ψ)/pT(jet), is measured using jets with pT(jet)>20 GeV in the pseudorapidity range 2.5<η(jet)<4.0. The observed z(J/ψ)distribution for J/ψ mesons produced in b-hadron decays is consistent with expectations. However, the results for prompt J/ψ production do not agree with predictions based on fixed-order nonrelativistic QCD. This is the first measurement of the pT fraction carried by prompt J/ψ mesons in jets at any experiment