Tracing of process pipelines at the design stage chemical processes

В работе предложен итерационный алгоритм на основе методов локальной оптимизации, позволяющий решать различные задачи трассировки, позволяющий решать различные задачи трассировки трубопроводов на этапе проектирования химико-технологических системЗапропоновано ітераційний алгоритм на основі методів локальної оптимізації, що дозволяє вирішувати завдання трасування трубопроводів, на етапі проектування хіміко-технологічних систем: алгоритм побудований за схемою, загальною для алгоритмів локальної оптимізації; перехід до задачі безумовної оптимізації дозволяє в якості початкового наближення приймати рішення, що не належить області допустимих значень; процес оптимізації розбивається на ряд етапів;отримання на кожному етапі рішення є локальним мінімумом щодо обраної околиці;пошук локальних рішень на кожному етапі здійснюється алгоритмом перепризначеньAn iterative algorithm based on local optimization techniques, which allows to solve the pipeline tracing tasks in the design phase chemical processes:algorithm is built on the scheme, the total for the local optimization algorithms;transition to the problem of unconstrained optimization allows for an initial approximation to make a decision, not belonging to the domain of acceptable values; optimization process is divided into several stages; receive at each stage of the decision is a local minimum with respect to the chosen neighborhood; search for local solutions in each step, the algorithm reassignmen

Recoil proton distribution in high energy photoproduction processes

For high energy linearly polarized photon--proton scattering we have calculated the azimuthal and polar angle distributions in inclusive on recoil proton experimental setup. We have taken into account the production of lepton and pseudoscalar meson charged pairs. The typical values of cross sections are of order of hundreds of picobarn. The size of polarization effects are of order of several percents. The results are generalized for the case of electroproduction processes on the proton at rest and for high energy proton production process on resting proton.Comment: LaTeX2e, 4 pages, 3 figure

Impulse Source in the Vicinity of a Convex Impedance Body: Minimization of the Field in the Shadow Region

The work deals with the optimization problem of impulse source field minimization in the shadow region of a convex body with variable surface impedance. The optimal impedance is searched using uniform asymptotic methods and Ritz method for functional minimization. Numerical results are presented for the Gaussian impulse source.В настоящей работе представлен метод определения оптимального покрытия поверхностей (поверхностного импеданса), при котором достигается минимум поля точечного импульсного источника в точке наблюдения, расположенной в тени относительно этого источника. Метод основан на геометрической теории дифракции и равномерных асимптотических методах, а также на методе минимизации функционалов Ритца.У роботі представлено метод визначення оптимального покриття поверхонь (поверхневого імпедансу), при якому досягається мінімум поля імпульсного джерела у точці спостереження, яка розташована у тіні відносно цього джерела. Метод засновано на геометричній теорії дифракції та рівномірних асимптотичних методах, а також на методі мінімізації функціоналів Рітца

The Uehling correction to the energy levels in a pionic atom

We consider a correction to energy levels in a pionic atom induced by the Uehling potential, i.e., by a free electron vacuum-polarization loop. The calculation is performed for circular states (l=n-1). The result is obtained in a closed analytic form as a function of $Z\alpha$ and the pion-to-electron mass ratio. Certain asymptotics of the result are also presented

Renoprotection and its association with eGFR and renal functional reserve

Renoprotection is a system of measures for primarily pharmacological control, contributing to the continued preservation of renal function. When choosing renoprotection tactics, it is necessary to consider not only the estimated GFR (using the EPI formula), but also a functional renal reserve. The method of determining the renal reserve with oral administration of 0.45–0.50% sodium chloride solution at the rate of 0.5 % of body weight is considered to be physiologically substantiated. The renal reserve determining based on this technique as a routine method for examining nephrological patients provides additional information not only on the number of functioning nephrons, but also on their condition. A differentiated approach to prescribing renoprotective agents has been proposed, taking into account the stage of the disease and the functional renal reserve for maximum preservation of functioning nephrons

Low-Molecular Weight Cow Colostrum Components in Functional Nutrition

Background: The concept of functional nutrition has been actively developed in recent years. LMWCC contains biologically active compounds of natural origin and can be promising components of functional nutrition.Methods: Wistar rats (intact, rats with Cu-induced toxicosis and rats with Cu-induced toxicosis, who received LMWCC per os in different doses of 0.01, 0.05, 0.1, 1, 2, 3 mg / 100 g of body weight of the animal). The effect of low-molecular weight components of cow colostrum (LMWCC) have been studied on the some physiological and biochemical parameters (body weight, temperature, ability to perform work, activity of aspartate aminotransferase, alanine aminotransferase, cholesterol, triacylglycerides, creatinine, albumin, gamma-glutamyltransferase and lipid hydroperoxides) in experimental animals with Cu -induced toxicosis.Results: It was found that LMWCC in small doses (0.05-0.1 mg / 100 g of weight) restored the growth rate, body temperature and partially working capacity in the test "swimming with a load" of animals with Cu-induced toxicosis. Restoration of physiological parameters in animals with Cu-induced toxemia correlated with activation of the antioxidant enzyme glutathione peroxidase and a decrease in serum hydroperoxides in blood serum.It was suggested that LMWCC can be promising components of functional nutrition for various toxicoses.Conclusions: LMWCC has antioxidant properties in relatively small doses (0.05-0.1 mg / 100 g of weight). Restoration of the physiological characteristics of animals with Cu-induced toxicosis correlates with the elimination of oxidative stress. Large doses of 1 mg / 100 g of body weight and more manifest pro-oxidant properties

Radiative corrections to the excitonic molecule state in GaAs microcavities

The optical properties of excitonic molecules (XXs) in GaAs-based quantum well microcavities (MCs) are studied, both theoretically and experimentally. We show that the radiative corrections to the XX state, the Lamb shift $\Delta^{\rm MC}_{\rm XX}$ and radiative width $\Gamma^{\rm MC}_{\rm XX}$, are large, about $10-30$ of the molecule binding energy $\epsilon_{\rm XX}$, and definitely cannot be neglected. The optics of excitonic molecules is dominated by the in-plane resonant dissociation of the molecules into outgoing 1$\lambda$-mode and 0$\lambda$-mode cavity polaritons. The later decay channel, ``excitonic molecule $\to$ 0$\lambda$-mode polariton + 0$\lambda$-mode polariton'', deals with the short-wavelength MC polaritons invisible in standard optical experiments, i.e., refers to ``hidden'' optics of microcavities. By using transient four-wave mixing and pump-probe spectroscopies, we infer that the radiative width, associated with excitonic molecules of the binding energy $\epsilon_{\rm XX} \simeq 0.9-1.1$ meV, is $\Gamma^{\rm MC}_{\rm XX} \simeq 0.2-0.3$ meV in the microcavities and $\Gamma^{\rm QW}_{\rm XX} \simeq 0.1$ meV in a reference GaAs single quantum well (QW). We show that for our high-quality quasi-two-dimensional nanostructures the $T_2 = 2 T_1$ limit, relevant to the XX states, holds at temperatures below 10 K, and that the bipolariton model of excitonic molecules explains quantitatively and self-consistently the measured XX radiative widths. We also find and characterize two critical points in the dependence of the radiative corrections against the microcavity detuning, and propose to use the critical points for high-precision measurements of the molecule bindingenergy and microcavity Rabi splitting.Comment: 16 pages, 11 figures, accepted for publication in Phys. Rev.

Minigap in a long disordered SNS junction: analytical results

We review and refine analytical results on the density of states in a long disordered superconductor - normal-metal - superconductor junction with transparent interfaces. Our analysis includes the behavior of the minigap near phase differences zero and PI across the junction, as well as the density of states at energies much larger than the minigap but much smaller than the superconducting gap.Comment: 4 page

On the pion electroproduction amplitude

We analyze amplitudes for the pion electroproduction on proton derived from Lagrangians based on the local chiral SU(2) x SU(2) symmetries. We show that such amplitudes do contain information on the nucleon axial form factor F_A in both soft and hard pion regimes. This result invalidates recent Haberzettl's claim that the pion electroproduction at threshold cannot be used to extract any information regarding F_A.Comment: 14 pages, 6 figures, revised version, accepted for publication in Phys. Rev.

On the application of radio frequency voltages to ion traps via helical resonators

Ions confined using a Paul trap require a stable, high voltage and low noise radio frequency (RF) potential. We present a guide for the design and construction of a helical coil resonator for a desired frequency that maximises the quality factor for a set of experimental constraints. We provide an in-depth analysis of the system formed from a shielded helical coil and an ion trap by treating the system as a lumped element model. This allows us to predict the resonant frequency and quality factor in terms of the physical parameters of the resonator and the properties of the ion trap. We also compare theoretical predictions with experimental data for different resonators, and predict the voltage applied to the ion trap as a function of the Q-factor, input power and the properties of the resonant circuit