Doklady Akademii nauk最新文献_第6页

Effective approach to a synthesis of fluorine-containing 4-acylamino-4,5,6,7-tetrahydrobenzisoxazoles 合成含氟4-酰基氨基-4,5,6,7-四氢苯并异恶唑的有效方法

Doklady Akademii nauk Pub Date : 2020-01-05 DOI: 10.29235/1561-8323-2019-63-6-716-720

T. S. Khlebnicova, Yu. A. Piven, I. Gerus, A. Sorochinsky, F. Lakhvich

引用次数: 0

On the possibility of evaluative prediction of the extraction of organic substances of complex structure using the method of group increments 基团增量法评价预测复杂结构有机物提取的可能性

Doklady Akademii nauk Pub Date : 2020-01-05 DOI: 10.29235/1561-8323-2019-63-6-704-715

M. Zayats, S. Leschev, A. U. Zaidzel

{"title":"On the possibility of evaluative prediction of the extraction of organic substances of complex structure using the method of group increments","authors":"M. Zayats, S. Leschev, A. U. Zaidzel","doi":"10.29235/1561-8323-2019-63-6-704-715","DOIUrl":"https://doi.org/10.29235/1561-8323-2019-63-6-704-715","url":null,"abstract":"The distribution of pesticides of different classes (amides, anilinopyrimidines, benzene derivatives, benzoylphenylureas, benzenesulfonates, hydrazides, dinitroanilines, carbamates, pyretroids, pyrimidines, tetrazines, triazoles, pheny lureas, organophosphorus compounds, esters of carboxylic acids) was studied at 20 ± 1 °C in the extraction systems of hexane–water, hexane–acetonitrile, hexane– acetonitrile and water mixture that are most often used in analytical chemistry of pesticides. The distribution constants P of pesticides and the increments of logarithms of the distribution constants If of their functional groups between the hydrocarbon and polar phases are calculated. Two main methods for evaluative prediction of lg P of pesticides are proposed and approved – substitutive method based on the calculation of lg P by replacing the substituents in the base molecule and the method of absolute addition of increments. The possibilities of the both methods are illustrated. The reasons for the deviations of the experimental values from the calculated ones are discussed. The influence of the nature and composition of the polar phase on the magnitudes of the observed deviations is estimated. In particular, they decrease dramatically with an increase in the acetonitrile content in the polar phase. Averaged values of correction to the calculated values of lg P are introduced. In most cases, they allow predicting lg P of pesticides with a deviation of not more than 0.5–1.0 from the calculated one.","PeriodicalId":11227,"journal":{"name":"Doklady Akademii nauk","volume":"57 1","pages":"704-715"},"PeriodicalIF":0.0,"publicationDate":"2020-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74938510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Method for calculation of radiative heat transfer in beds of spherical particles 球形颗粒床中辐射传热的计算方法

Doklady Akademii nauk Pub Date : 2020-01-04 DOI: 10.29235/1561-8323-2019-63-6-680-688

А.И. Малиновский

{"title":"Method for calculation of radiative heat transfer in beds of spherical particles","authors":"А.И. Малиновский","doi":"10.29235/1561-8323-2019-63-6-680-688","DOIUrl":"https://doi.org/10.29235/1561-8323-2019-63-6-680-688","url":null,"abstract":"A new technique for implementing external (particle-to-wall) and particle-to-particle radiative heat transfer in discrete elements method (DEM) simulations is proposed. It is based on the idea that an expected view factor value depends on relevant local bed parameters (distance between particles, particle radius ratio, and local bed porosity). Calculation of average view factors via the formula requires considerably less computational effort than direct in situ integration, when this happens a reasonable average value and an overall accuracy comparable to direct calculation are provided. Both mono- and polydisperse mixtures of spherical opaque particles were considered. It was shown that using nondimensional parameters, a simple general dependence for an external radiative heat flux may be introduced. Exponential and linear fits were proposed for estimating the particle-particle radiative heat flux. The generalization of the obtained formulas for various bed porosities is proposed. The distribution of cumulative transferred heat flux across the particles up to a certain distance was found, and the recommendations regarding the choice of that parameter to achieve a desired accuracy were formulated. Also, the method to account for the particle emissivity was proposed on the basis of the empirical dependence between emissivity and radiative heat flux in porous materials. The proposed method satisfies all the requirements to become a standard implementation of radiative heat transfer calculation in DEM.","PeriodicalId":11227,"journal":{"name":"Doklady Akademii nauk","volume":"17 1","pages":"680-688"},"PeriodicalIF":0.0,"publicationDate":"2020-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90778624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Опорные точки полунепрерывных снизу функций относительно множества липшицевых вогнутых функций 函数下半连续的支点相对于许多粘性凹形函数

Doklady Akademii nauk Pub Date : 2020-01-04 DOI: 10.29235/1561-8323-2019-63-6-647-653

Валентин Викентьевич Гороховик, А. С. Тыкун

{"title":"Опорные точки полунепрерывных снизу функций относительно множества липшицевых вогнутых функций","authors":"Валентин Викентьевич Гороховик, А. С. Тыкун","doi":"10.29235/1561-8323-2019-63-6-647-653","DOIUrl":"https://doi.org/10.29235/1561-8323-2019-63-6-647-653","url":null,"abstract":"For the functions defined on normed vector spaces, we introduce a new notion of the LC -convexity that generalizes the classical notion of convex functions. A function is called to be LC -convex if it can be represented as the upper envelope of some subset of Lipschitz concave functions. It is proved that the function is LC -convex if and only if it is lower semicontinuous and, in addition, it is bounded from below by a Lipschitz function. As a generalization of a global subdifferential of a classically convex function, we introduce the set of LC -minorants supported to a function at a given point and the set of LC -support points of a function that are then used to derive a criterion for global minimum points and a necessary condition for global maximum points of nonsmooth functions. An important result of the article is to prove that for a LC - convex function, the set of LC -support points is dense in its effective domain. This result extends the well-known Brondsted– Rockafellar theorem on the existence of the sub-differential for classically convex lower semicontinuous functions to a wider class of lower semicontinuous functions and goes back to the one of the most important results of the classical convex analysis – the Bishop–Phelps theorem on the density of support points in the boundary of a closed convex set.","PeriodicalId":11227,"journal":{"name":"Doklady Akademii nauk","volume":"10 1","pages":"647-653"},"PeriodicalIF":0.0,"publicationDate":"2020-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72812199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Solvability criterion of the control problem of an asynchronous spectrum of linear almost periodic systems with the trivial averaging of the coefficient matrix 具有系数矩阵平凡平均的线性概周期系统异步谱控制问题的可解性判据

Doklady Akademii nauk Pub Date : 2020-01-04 DOI: 10.29235/1561-8323-2019-63-6-654-661

A. Demenchuk

{"title":"Solvability criterion of the control problem of an asynchronous spectrum of linear almost periodic systems with the trivial averaging of the coefficient matrix","authors":"A. Demenchuk","doi":"10.29235/1561-8323-2019-63-6-654-661","DOIUrl":"https://doi.org/10.29235/1561-8323-2019-63-6-654-661","url":null,"abstract":"A linear control system with an almost periodic matrix of coefficients and the control in the form of feedback linear in phase variables is considered. It is assumed that the feedback coefficient is almost periodic and its frequency module, i. e. the smallest additive group of real numbers, including all the Fourier exponents of this coefficient, is contained in the frequency module of the coefficient matrix. The system under consideration is studied in the case of a zero average value of the matrix of coefficients. For the described class of systems, the control problem of the spectrum of irregular oscillations (asynchronous spectrum) with a target set of frequencies is solved. This task is as follows: to construct such a control from an admissible set so that the system closed by this control has almost periodic solutions, the set of Fourier exponents (frequency spectrum) that are contained in a predetermined subset; the intersection of the solution frequency modules and the coefficient matrix is trivial. The necessary and sufficient conditions for solvability of the control problem of the asynchronous spectrum are obtained.","PeriodicalId":11227,"journal":{"name":"Doklady Akademii nauk","volume":"22 1","pages":"654-661"},"PeriodicalIF":0.0,"publicationDate":"2020-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89712222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correctness problem of the threshold method of modular sharing of secrets with masking transformation 带掩蔽变换的模块化秘密共享阈值方法的正确性问题

Doklady Akademii nauk Pub Date : 2020-01-04 DOI: 10.29235/1561-8323-2019-63-6-662-671

A. F. Chernyavsky, A. Kolyada, A. Martinov, S. Y. Protasenya

引用次数: 0

Фермион с тремя массовыми параметрами: взаимодействие с внешними полями 有三个质量参数的费米翁:与外部磁场的相互作用

Doklady Akademii nauk Pub Date : 2019-01-13 DOI: 10.29235/1561-8323-2018-62-6-661-667

V. V. Kisel, V. A. Pletyukhov, E. M. Ovsiyuk, Ya. A. Voynova, O. V. Veko, V. M. Red'kov

引用次数: 1

Состав отходящих газов при каталитическом синтезе углеродных наноматериалов при пиролитическом разложении пропан-бутановой смеси 碳纳米材料催化合成中的退火气体组成

Doklady Akademii nauk Pub Date : 2019-01-13 DOI: 10.29235/1561-8323-2018-62-6-685-693

Т. Н. Генарова, В. В. Грушевский, П. Н. Кривошеев, Олег Глебович Пенязьков, И. Ф. Буяков, Юлия Михайловна Дмитренко, С. А. Жданок, А. П. Чернухо

{"title":"Состав отходящих газов при каталитическом синтезе углеродных наноматериалов при пиролитическом разложении пропан-бутановой смеси","authors":"Т. Н. Генарова, В. В. Грушевский, П. Н. Кривошеев, Олег Глебович Пенязьков, И. Ф. Буяков, Юлия Михайловна Дмитренко, С. А. Жданок, А. П. Чернухо","doi":"10.29235/1561-8323-2018-62-6-685-693","DOIUrl":"https://doi.org/10.29235/1561-8323-2018-62-6-685-693","url":null,"abstract":"It is known that during the process of carbon nanomaterials synthesis, gaseous products and various unknown hydrocarbons are formed. Thus, the production of carbon nanomaterials could damage the environment. A detailed analysis of all gaseous products during the pyrolysis process is needed in order to clarify the nature of the formed substances and to control the technological characteristics of the catalyst. The chemical composition study of exhaust gases was made on the facility of propane-butane mixture pyrolysis for the carbon nanomaterial synthesis. The analysis of 16 polycyclic aromatic hydrocarbons (PAHs) of the extracts is made using a gas chromatography-mass spectrometry method. A quantitative analysis of gases was made by gas chromatography coupled with a heat conduction detector and a flame ionization detector. It was established that the concentrations of some PAHs exceed 14, 20, 90 and 100 times much as a maximum permissible concentration in the air. It was found that the appropriate devices of carbon nanomaterial production should be used in order to eliminate the PAHs that are formed.","PeriodicalId":11227,"journal":{"name":"Doklady Akademii nauk","volume":"181 ","pages":"685-693"},"PeriodicalIF":0.0,"publicationDate":"2019-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91447479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Структуры и математические модели автокомпенсаторов мешающих излучений градиентного типа

Doklady Akademii nauk Pub Date : 2019-01-13 DOI: 10.29235/1561-8323-2018-62-6-763-768

С. М. Костромицкий, А. П. Шумский, И. Н. Давыденко

引用次数: 0

Реконструкция повреждений ротаторно-бицепитального комплекса при оперативном лечении переломов проксимального отдела плеча 扭转二头肌损伤的重建，手术治疗肩部近端骨折。

Doklady Akademii nauk Pub Date : 2019-01-13 DOI: 10.29235/1561-8323-2018-62-6-732-738

O. A. Danilenko, E. R. Makarevich, N. S. Serdyuchenko, A. V. Malashko

{"title":"Реконструкция повреждений ротаторно-бицепитального комплекса при оперативном лечении переломов проксимального отдела плеча","authors":"O. A. Danilenko, E. R. Makarevich, N. S. Serdyuchenko, A. V. Malashko","doi":"10.29235/1561-8323-2018-62-6-732-738","DOIUrl":"https://doi.org/10.29235/1561-8323-2018-62-6-732-738","url":null,"abstract":"The aim of the work was to improve the results of surgical treatment of patients having fractures of the proximal shoulder with the use of the approaches, including the reposition of bone fragments with adequate osteosynthesis and prevention of impingement syndrome, the reconstruction of all damaged structures of the rotator-bicipitale complex. A score assessment of the treatment results of 512 patients aged from 18 to 87 years old was performed, operated from 2004 to 2018 for the treatment of which the tactical approaches and the methods of surgical treatment developed by the authors aimed at restoring the rotator and bicipital elements were used. The use of the developed tactical approaches and methods made it possible to achieve a favorable outcome of treatment in 503 (98.2 %) patients. Thus, the reconstruction of injuries of the rotatory-bicipital complex is a promising way to improve the results of treatment in patients with fractures of the proximal shoulder.","PeriodicalId":11227,"journal":{"name":"Doklady Akademii nauk","volume":"22 1","pages":"732-738"},"PeriodicalIF":0.0,"publicationDate":"2019-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88736204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0