Dielectric Response and a Phenomenon of a Narrow Band Absorption for a Classical Rotor in a Double Well Potential

The theory of dielectric relaxation in a planar ensemble of polar molecules is presented for a model where dipoles rotate in an intermolecular conservative double well potential, having a profile U = U_0*sin^2(θ). The evolution of the wide band dielectric spectra is demonstrated when the potential depth U_0 is varied; an isotropic and anisotropic medium being taken as examples. The spectra comprise the Debye relaxation and the quasi-resonant Poley absorption region. The rigorous theory is compared with a simplified one which was called the hybrid quasi-elastic bond / extended diffusion model. This approximation is valid for a qualitative description and also for the quantitative one at the large field parameter p = (U_0/((k_B)T))^(1/2). For P >> 1 the spectrum comprises one narrow absorption band and one Debye relaxation region considerably shifted to low frequencies. It is show that in the long lifetime limit τ there exists a minimum absorption band Δν_0(p). The quantity Δν_0 becomes small if the parameter p >> 1.The dielectric relaxation in ice 1 is discussed with regards to this phenomenon

HYDROLYTIC STABILITY OF IMIDES OF DIFFERENT STRUCTURES

The conversion kinetics of N(o-carboxyphenyl)naphthalimide has been studied in buffer solutions over a pH range 5-12.6 and temperature range 25-70 °C. The naphthalimide hydrolysis is shown to be a reversible reaction. The mechanism of the alkaline hydrolysis of N(o- carboxyphenyl) phthalimide is proposed. The structure dependence of the imide hydrolytic stability is explained on the basis of the suggested mechanism

ПРОЕКТУВАННЯ ПРИРОДООХОРОННИХ КОМПЛЕКСІВ З ВИКОРИСТАННЯМ САПР

The tutorial discusses the principles and methodology of designing environmentally safe industries using CAD; there is a laboratory workshop: design documentation and drawings using CAD. All topics of the relevant typical discipline are discussed in detail, as well as a series of additional issues and directions. It is designed for students at higher educational institutions, graduate students, teachers and researchers, as well as specialists involved in environmental protection activities. Indexing:              У навчальному посібнику розглядаються принципи та методика проектування екологічно безпечних виробництв з використанням САПР; наведено лабораторний практикум: оформлення проектної документації та креслень з використанням САПР. Детально розглянуті всі теми відповідної типової навчальної дисципліни, а також висвітлено ряд додаткових питань та напрямів. Розраховано на студентів вищих навчальних закладів освіти, аспірантів, викладачів і наукових співробітників, а також спеціалістів, які займаються природоохоронною діяльністю. Індексація:              &nbsp

П'ята міжнародна наукова-практична конференція «Комп’ютерне моделювання в хімії і технологіях та системах сталого розвитку»

Наведено результати розробки емпіричних рівнянь для розрахунку параметрів рівноваги газ-рідина в системі NH3 – CO2 – H2O за тиску нижче атмосферного і концентраціях NH3 і CO2 в рідини в діапазоні їх розчинності в воді. Зокрема, отримано формули для розрахунку рівноважного тиску аміаку, діоксиду вуглецю і водяної пари, а також температури кипіння розчину під атмосферним тиском.The article presents the results of development of empirical equations for calculation of the gas-liquid equilibria parameters of the system NH3 - CO2 - H2O at a pressure below atmospheric and NH3 and CO2 concentrations in the liquid in the range of their solubility in water. The formulas for calculating of ammonia, carbon dioxide and water vapour equilibrium pressure, and their solution boiling point at atmospheric pressure were obtained.Приведены результаты разработки эмпирических уравнений для расчета параметров равновесия газ-жидкость в системе NH3 – CO2 – H2O при давлениях ниже атмосферного и концентрациях NH3 и CO2 в жидкости в диапазоне их растворимости в воде. В частности, получены формулы для расчета равновесного давления аммиака, диоксида углерода и водяного пара, а также температуры кипения раствора под атмосферным давлением

Use of Rapid-Scan EPR to Improve Detection Sensitivity for Spin-Trapped Radicals

AbstractThe short lifetime of superoxide and the low rates of formation expected in vivo make detection by standard continuous wave (CW) electron paramagnetic resonance (EPR) challenging. The new rapid-scan EPR method offers improved sensitivity for these types of samples. In rapid-scan EPR, the magnetic field is scanned through resonance in a time that is short relative to electron spin relaxation times, and data are processed to obtain the absorption spectrum. To validate the application of rapid-scan EPR to spin trapping, superoxide was generated by the reaction of xanthine oxidase and hypoxanthine with rates of 0.1–6.0 μM/min and trapped with 5-tert-butoxycarbonyl-5-methyl-1-pyrroline-N-oxide (BMPO). Spin trapping with BMPO to form the BMPO-OOH adduct converts the very short-lived superoxide radical into a more stable spin adduct. There is good agreement between the hyperfine splitting parameters obtained for BMPO-OOH by CW and rapid-scan EPR. For the same signal acquisition time, the signal/noise ratio is >40 times higher for rapid-scan than for CW EPR. Rapid-scan EPR can detect superoxide produced by Enterococcus faecalis at rates that are too low for detection by CW EPR

Четверта міжнародна наукова-практична конференція «Комп’ютерне моделювання в хімії і технологіях та системах сталого розвитку»

Розглянуто розрахунок рівноважного складу розчину в системі сульфід – гідросульфід барію – сірководень – вода. Запропонована система рівнянь, яка з високою достовірністю описує зміну рН в залежності від відношення загальних концентрацій барію та сірки у розчині, що, зокрема, може бути використано при визначенні швидкості абсорбції діоксиду вуглецю.The article considers calculating the equilibrium composition of the solution in the barium sulphide / barium hydrosulphide / hydrogen sulphide / water system. It proposes a system of equations that reliably describes the pH change as a function of the barium to sulphur total concentration ratio in the solution. These equations can be particularly useful in calculating the rate of absorption of carbon dioxide.Рассмотрен расчет равновесного состава раствора в системе сульфид – гидросульфид бария – сероводород – вода. Предложена система уравнений, которая с высокой достоверностью описывает изменение рН в зависимости от отношения общих концентраций бария и серы в растворе, что, в частности, может быть использовано для расчета скорости абсорбции диоксида углерода

Some reproduction behaviour features of families with cancer children

Purpose: The research studies behavior of families having children with cancer, in a stressful situation and the role of various factors influencing reproductive strategy of this group of families.Materials and methods. Questioning of 798 mothers from the different regions of the Russian Federation having disabled children with cancer, ages from 5 till 18 years, in the remission. Results. Child cancer changes the system of parents’ vital values towards a pro-family orientation –family, children, health become their priorities. The analysis of average ideal (2.5), average desirable (2.6) and average expected (2.1) indicators showed high reproductive potential of respondents, which is more if compared with similar indicators in other domestic sociological researches. 40,8% of respondents proved the influence of child cancer on their family planning behavior. The article gives a detailed analysis of the factors determining these families reproduction strategy: socio-economic, socio-psychological and sociocultural, personal features of respondents, medical characteristics of the disease and the therapy methods. Summary. The research proves that the majority of the families with cancer children consolidates to overcome the difficulties connected with cancer treatment, becomes more patriarchal and close-knit. The role of family values, paternity, motherhood, and, accordingly, the need in more children increases in this group of families. The families need psychological and medico-social support taking into account the complex of their problems

Mathematical modeling of the equilibrium composition in the system BaS –Ba(HS)2–H2S –Н2О

Розроблено математичну модель, що описує рівноважний склад системи BaS – Ba(HS)2 – H2S – Н2О, яка дозволяє, зокрема, розраховувати рН розчину. Модель використано для розрахунку рушійної сили десорбції сірководню у процесі отримання карбонату барію.A mathematical model describing the equilibrium composition of the BaS – Ba(HS)2 – H2S – Н2О system is developed. Model allows, in particular, to calculate the pH of the solution, and was used to calculate the driving force for desorption of hydrogen sulfide in the process of obtaining barium carbonate.Разработана математическая модель, описывающая равновесный состав системы BaS – Ba(HS)2 – H2S – Н2О, позволяющая, в частности, рассчитывать рН раствора. Модель использована для расчета движущей силы десорбции сероводорода в процессе получения карбоната бария

Energic metabolism studies in pediatric cancer patients

The aim. To estimate heat capacity (C) measurements for individual dietary support of pediatric cancer patients during chemotherapy. Material and methods. 43 cancer children are examined. Group 1: 15 children, 5 children receiving polychemotherapy, 10 children – in post-BMT period (5 of them were re-examined on clinical indications). Thus we got 21 resting heat capacity measures. Group 2 includes 14 children with cancer after completing chemotherapy. Group 3 (control group) – 14 children with gastroenterological pathology. (C) is determined by indirect calorimetry, then basal metabolic rate (BMR) is calculated by formula BMR=90%C and compared with (Cf), calculated by formula WHO (1985). The results. In group 1 the average values of BMR and Еоф considerably differ: 986,5 and 1285,9 kcal accordingly (p<0,05). In group 2 BMR value is lower than Cf, however the difference is inconsiderable. The amount of children with decreased BMR in group 1 is considerably higher than in groups 2 and 3 – 76,2%; 42,9% and 28,6% accordingly (p<0,05). On the contrary group 3 includes more children with increased BMR, than group 1 (p<0,01). The marked decrease of heat capacity (C decrease) in group 1 is mainly associated with toxic effects of polychemotherapy and BMT on metabolic processes. Conclusion. The findings justify the need to monitor the pediatric cancer patients during special treatment to estimate their heat capacity to work out individual programs of dietary support with further assessment of effectiveness and correction

ФОРМИРОВАНИЕ «НОВОЙ БИФУРКАЦИИ» У БОЛЬНЫХ С ПРОЛОНГИРОВАННЫМ АТЕРОСКЛЕРОТИЧЕСКИМ ПОРАЖЕНИЕМ ВСА

This article provides indications for and description of surgical technique of carotid endarterectomy with the formation of a new bifurcation. It also presents the results of observations in the immediate postoperative period based on the findings of this surgery among patients of Vishnevsky National Medical Research Center of Surgery.В данной статье приведены показания для проведения и подробная техника выполнения КЭАЭ с формированием новой бифуркации. Также приведены результаты наблюдений в ближайшем послеоперационном периоде по результатам этой операции среди пациентов института хирургии им. А. В. Вишневского