124 research outputs found
Bethe Ansatz Equations for General Orbifolds of N=4 SYM
We consider the Bethe Ansatz Equations for orbifolds of N =4 SYM w.r.t. an
arbitrary discrete group. Techniques used for the Abelian orbifolds can be
extended to the generic non-Abelian case with minor modifications. We show how
to make a transition between the different notations in the quiver gauge
theory.Comment: LaTeX, 66 pages, 9 eps figures, minor corrections, references adde
Metalloporphyrin - Organic Polymer Photosensitive Compositions: Experimental Studies and Computer Simulation of Photoprocesses
The dependence of porphyrin photobleaching vs. excitation power density has been found to be linear and points to a one-photon reaction type. The influence of pyridine and ethyl iodide additions and of molecular oxygen on the pigment decomposition rate has been investigated. Установлено, что зависимость фотообесцвечивания порфиринов от плотности мощности возбуждения имеет линейный характер и указывает на однофотонный тип реакции. Исследовано влияние добавок пиридина, йодистого этила и молекулярного кислорода на скорость разложения пигмента
Lasing and sensor media on the base of Zinc and BF2 complexes with different structures of dipyrromethenes
ВЛИЯНИЕ ТЕТРАФЕНИЛЗАМЕЩЕНИЯ НА ФОТОФИЗИКУ МОЛЕКУЛ ТЕТРААЗАПОРФИНА И ТЕТРААЗАХЛОРИНА
We have measured the spectral-luminescent characteristics of tetraphenyltetraazaporphin and a substituted tetraphenyltetraazachlorin, a new potential absorber and emitter for the near IR region, in solutions at 293 and 77 K as well as the quantum yields of fluorescence and singlet oxygen generation. It has been shown that the changes in the excited electronic states energy in passing from tetraphenyl substituted to octaphenyl substituted compounds are not minor. Based on performed quantum-chemical calculation, an explanation of this property is given. It has been found that, for tetraazaporphin, the tetraphenyl substitution results in decreasing the quantum yields of fluorescence and singlet oxygen generation whereas, for tetraazachlorin, on the contrary, tetraphenyl substitution results in the rise of their values.Измерены спектрально-люминесцентные характеристики тетрафенилтетраазапорфина и замещенного тетрафенилтетраазахлорина, нового потенциального поглотителя и излучателя для ближней ИК области, в растворах при 293 и 77 К, а также значения квантовых выходов флуоресценции и генерации синглетного кислорода. Показано, что изменения энергии возбужденных электронных состояний при переходе от тетрафенилзамещенных соединений к октафенилзамещенным незначительны. На основе выполненных квантово-химических расчетов дано объяснение этого свойства. Найдено, что в результате тетрафенилзамещения для тетраазапорфина значения квантовых выходов флуоресценции и образования синглетного кислорода снижаются, а для тетраазахлорина, наоборот, повышаются
Spin chain for the deformed ABJM theory
In this short note we begin the analysis of deformed integrable Chern-Simons
theories. We construct the two loop dilatation operator for the scalar sector
of the ABJM theory with and we compute the anomalous dimension of
some operators.Comment: 25 pages, 2 figures; references adde
Method of prevention of neointimal hyperplasia during arterial reconstruction by way of application of anastomose zone with semitrainable membrane with cytostatic preparation
This article aims to examine the effectiveness of a method for the prevention of neointimal hyperplasia by applying an anastomosis area to a paclitaxel semi-permeable membrane with a cytostatic drug. As a result of the analysis, the slow growth of neointima was found for the first time when Paclitaxel anastomosis zone was applied during the formation of an arteriovenous fistula in an experimental model in rabbits.В данной статье ставится задача рассмотреть эффективность способа профилактики неоинтимальной гиперплазии путём аппликации зоны анастомоза полупроницаемой мембраной с цитостатическим препаратом – Паклитакселем. В результате анализа, впервые выявлено замедлениние разрастание неоинтимы при аппликации зоны анастомоза Паклитакселем при формировании артериовенозной фистулы в экспериментальной модели на кроликах
Impact of uniaxial strain and doping on oxygen diffusion in CeO2
Doped ceria is an important electrolyte for solid oxide fuel cell applications. Molecular dynamics simulations have been used to investigate the impact of uniaxial strain along the directions and rare-earth doping (Yb, Er, Ho, Dy, Gd, Sm, Nd, and La) on oxygen diffusion. We introduce a new potential model that is able to describe the thermal expansion and elastic properties of ceria to give excellent agreement with experimental data. We calculate the activation energy of oxygen migration in the temperature range 900-1900K for both unstrained and rare-earth doped ceria systems under tensile strain. Uniaxial strain has a considerable effect in lowering the activation energies of oxygen migration. A more pronounced increase in oxygen diffusivities is predicted at the lower end of the temperature range for all the dopants considered
Ab initio studies of structures and properties of small potassium clusters
We have studied the structure and properties of potassium clusters containing
even number of atoms ranging from 2 to 20 at the ab initio level. The geometry
optimization calculations are performed using all-electron density functional
theory with gradient corrected exchange-correlation functional. Using these
optimized geometries we investigate the evolution of binding energy, ionization
potential, and static polarizability with the increasing size of the clusters.
The polarizabilities are calculated by employing Moller-Plesset perturbation
theory and time dependent density functional theory. The polarizabilities of
dimer and tetramer are also calculated by employing large basis set coupled
cluster theory with single and double excitations and perturbative triple
excitations. The time dependent density functional theory calculations of
polarizabilities are carried out with two different exchange-correlation
potentials: (i) an asymptotically correct model potential and (ii) within the
local density approximation. A systematic comparison with the other available
theoretical and experimental data for various properties of small potassium
clusters mentioned above has been performed. These comparisons reveal that both
the binding energy and the ionization potential obtained with gradient
corrected potential match quite well with the already published data.
Similarly, the polarizabilities obtained with Moller-Plesset perturbation
theory and with model potential are quite close to each other and also close to
experimental data.Comment: 33 pages including 10 figure
ВЛИЯНИЕ КОМПОНЕНТНОГО СОСТАВА МИЦЕЛЛЯРНОГО РАСТВОРА НА СПЕКТРАЛЬНЫЕ СВОЙСТВА И СОЛЮБИЛИЗАЦИЮ ПЛЮРОНИКОМ ПРОИЗВОДНОГО БОРДИФТОРИД-ДИПИРРОЛИЛМЕТЕНА
It has been shown by a spectral method that the efficiency of solubilization of a borondifluoride dipyrromethene derivative by Pluronic F-127 inmixed systems depends on the proportions of mass concentrations of the dye and Pluronic in an initial liquid solution. It has been established that the values of the Pluronic F-127 concentration, at which the micelles solubilizing the dye are efficiently formed, exceed 10 % (mass). The analysis of spectral characteristics of the solution of the “dye – Pluronic” adducts has shown that the dye under study exists in the Pluronic micelles in the highest degree of disaggregation manifesting the spectral characteristics of monomeric form.Спектральным методом показано, что эффективность солюбилизации плюроником F-127 производного бордифторид-дипирролилметена зависит от соотношения в смешанных системах массовых концентраций красителя и плюроника в исходном жидком растворе. Установлено, что характерные значения концентраций плюроника в растворе, при которых образуются мицеллы, солюбилизирующие краситель, превышают 10 мас.%. Анализ спектральных характеристик рас- творов аддуктов «краситель–плюроник» показал, что исследуемый краситель в мицеллах плюроника находится в наибольшей степени дезагрегации, проявляя спектральные характеристики мономерной формы.
Extended Thromboprophylaxis with Betrixaban in Acutely Ill Medical Patients
Background
Patients with acute medical illnesses are at prolonged risk for venous thrombosis. However, the appropriate duration of thromboprophylaxis remains unknown.
Methods
Patients who were hospitalized for acute medical illnesses were randomly assigned to receive subcutaneous enoxaparin (at a dose of 40 mg once daily) for 10±4 days plus oral betrixaban placebo for 35 to 42 days or subcutaneous enoxaparin placebo for 10±4 days plus oral betrixaban (at a dose of 80 mg once daily) for 35 to 42 days. We performed sequential analyses in three prespecified, progressively inclusive cohorts: patients with an elevated d-dimer level (cohort 1), patients with an elevated d-dimer level or an age of at least 75 years (cohort 2), and all the enrolled patients (overall population cohort). The statistical analysis plan specified that if the between-group difference in any analysis in this sequence was not significant, the other analyses would be considered exploratory. The primary efficacy outcome was a composite of asymptomatic proximal deep-vein thrombosis and symptomatic venous thromboembolism. The principal safety outcome was major bleeding.
Results
A total of 7513 patients underwent randomization. In cohort 1, the primary efficacy outcome occurred in 6.9% of patients receiving betrixaban and 8.5% receiving enoxaparin (relative risk in the betrixaban group, 0.81; 95% confidence interval [CI], 0.65 to 1.00; P=0.054). The rates were 5.6% and 7.1%, respectively (relative risk, 0.80; 95% CI, 0.66 to 0.98; P=0.03) in cohort 2 and 5.3% and 7.0% (relative risk, 0.76; 95% CI, 0.63 to 0.92; P=0.006) in the overall population. (The last two analyses were considered to be exploratory owing to the result in cohort 1.) In the overall population, major bleeding occurred in 0.7% of the betrixaban group and 0.6% of the enoxaparin group (relative risk, 1.19; 95% CI, 0.67 to 2.12; P=0.55).
Conclusions
Among acutely ill medical patients with an elevated d-dimer level, there was no significant difference between extended-duration betrixaban and a standard regimen of enoxaparin in the prespecified primary efficacy outcome. However, prespecified exploratory analyses provided evidence suggesting a benefit for betrixaban in the two larger cohorts. (Funded by Portola Pharmaceuticals; APEX ClinicalTrials.gov number, NCT01583218. opens in new tab.
- …