Seriya 3: Fizika, Astronomiya最新文献_第7页

Latest Advances in Scanning Ion-Conductance Microscopy and Nanopipette Systems for Single-Cell Analysis under Serial Conditions 用于串行条件下单细胞分析的扫描离子电导显微镜和纳米移液管系统的最新进展

Seriya 3: Fizika, Astronomiya Pub Date : 2023-12-19 DOI: 10.55959/msu0579-9392.78.2360701

D.A. Shergin, A.P Yakovlev, P. Gorelkin, S.V. Salikhov, A. Erofeev

引用次数: 0

The Guggenheim equation for a system of hard spheres and its generalization 硬球系统的古根海姆方程及其广义化

Seriya 3: Fizika, Astronomiya Pub Date : 2023-12-19 DOI: 10.55959/msu0579-9392.78.2360101

P. N. Nikolaev

引用次数: 0

Separation of pair and single top quark production in tWb-associated final state using a neural network 利用神经网络分离 tWb 相关终态中的成对和单顶夸克生成

Seriya 3: Fizika, Astronomiya Pub Date : 2023-12-19 DOI: 10.55959/msu0579-9392.78.2360201

E. Boos, V. Bunichev, P. Volkov, L. Dudko, M. Perfilov

{"title":"Separation of pair and single top quark production in tWb-associated final state using a neural network","authors":"E. Boos, V. Bunichev, P. Volkov, L. Dudko, M. Perfilov","doi":"10.55959/msu0579-9392.78.2360201","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2360201","url":null,"abstract":"The paper presents a method for separating the contribution of pair and single top quark production in\u0000tWb-associated final state using a neural network. The proposed method makes possible to calculate such\u0000processes in a gauge-invariant way with fully taking into account interference contributions and dividing the\u0000phase space into single-resonant and double-resonant regions, which is necessary to increase the accuracy of\u0000the search for possible deviations from the predictions of the Standard Model in these processes. To train the\u0000neural network, the optimized set of observables is used to separate single-resonance and double-resonance\u0000contributions to the overall process. The use of this method allows us to avoid the disadvantages inherent\u0000in the schemes used in collider physics for calculating the processes of tWb-associated top quark production\u0000with the removal of Feynman diagrams, which leads to violation of gauge invariance, or the addition of a\u0000subtraction scheme, which leads to the appearance of negative weights for the part of simulated events. The\u0000proposed method can be used to increase the efficiency of searching for deviations from the predictions of the\u0000Standard Model in the interaction of the top quark with the W boson and b quark.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":" 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138959902","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

Mechanical alloying in compositions iron–titanium–carbon (diamond) 铁-钛-碳（金刚石）成分的机械合金化

Seriya 3: Fizika, Astronomiya Pub Date : 2023-12-19 DOI: 10.55959/msu0579-9392.78.2360501

S. Kovaliova, T.Yu. Kiseleva, T. F. Grigoreva, V. Zhornik, E. Devyatkina, S. Vosmerikov

{"title":"Mechanical alloying in compositions iron–titanium–carbon (diamond)","authors":"S. Kovaliova, T.Yu. Kiseleva, T. F. Grigoreva, V. Zhornik, E. Devyatkina, S. Vosmerikov","doi":"10.55959/msu0579-9392.78.2360501","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2360501","url":null,"abstract":"X-ray diffraction analysis, scanning electron microscopy and M¨ossbauer spectroscopy have been applied to the study of Fe-xTi (x=20–40 wt.%), Fe/xTi-diamond and Fe–Ti–C powders structure formation under the conditions of an AGO-2 planetary ball mill. It has been shown that metals with high melting points and limited solubility under high-energy mechanical action for 20 min interact to form an alloy of nanostructured iron and grain-boundary phases similar to solid solutions of Fe(Ti), Ti(Fe) and FeTi with a total content of 22–24 %. In the Fe-20wt.%Ti composition, titanium reaches an X-ray amorphous state, and when the titanium content is above 20 wt.% 𝛼-Ti crystalline phase remains in an amount of 5–10 wt.%. When the Fe/xTi-diamond mixture is mechanically activated, composite particles with a metal matrix structure with a diamond size of 0.3–1.5 𝜇m are formed. It has been established titanium accelerates the process of grain-boundary and volumetric interaction of iron with diamond and titanium carbide. In the powder compositions under study, a solid solution is formed based on iron and TiC, Fe3C compounds with their total content: Fe/40 wt.%Ti-diamond up to 62%; Fe/TiC up to 34%. Under similar conditions in a diamond-iron mixture, the grain-boundary phases of the solid solution do not exceed 26%. The formation of graphite has not detected by X-ray diffraction.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"504 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139171854","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

Recovering of gaps in the time series of CO2 concentration and air temperature using methods of mathematical statistics 利用数理统计方法恢复CO2浓度与气温时间序列的间隙

Seriya 3: Fizika, Astronomiya Pub Date : 2023-06-16 DOI: 10.55959/msu0579-9392.78.2330101

V. S. Aleshnovskii, A. Bezrukova, V. K. Avilov, V. A. Gazaryan, Y. Kurbatova, O. Kuricheva, A. Chulichkov, N. E. Shapkina

{"title":"Recovering of gaps in the time series of CO2 concentration and air temperature using methods of mathematical statistics","authors":"V. S. Aleshnovskii, A. Bezrukova, V. K. Avilov, V. A. Gazaryan, Y. Kurbatova, O. Kuricheva, A. Chulichkov, N. E. Shapkina","doi":"10.55959/msu0579-9392.78.2330101","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2330101","url":null,"abstract":"The article is devoted to the problem of recovering gaps in the data series of experimental long-term\u0000continuous high-frequency observations of carbon dioxide concentration and air temperature. The study was\u0000carried out on the example of the results of observations of an automatic ecological and climatic station\u0000located in a tropical monsoon forest on the territory of south Vietnam (Dong Nai Nature Reserve). Omissions\u0000in the series of observations, as a rule, are random and are caused by technical malfunctions of the instrument\u0000base. Correctly recovered series of observations allow us to estimate the temporal variability of the observed\u0000parameters on different time scales. Within the framework of this study, options for recovering the continuity\u0000of time series based on the methods of mathematical statistics - autoregression (ARIMA) and the method of\u0000linear prediction were considered. A comparative analysis of the accuracy of restoring omissions by various\u0000methods is given.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130974355","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

Cross sections of partial photoneutron reactions: the problems with reliability and new data 部分光子中子反应的截面:可靠性问题和新数据

Seriya 3: Fizika, Astronomiya Pub Date : 2023-06-16 DOI: 10.55959/msu0579-9392.78.2330205

Davydov A.I., Varlamov V.V., Orlin V.N.

引用次数: 0

Nanoscale biosensor with integratedthermoregulation controllerfor DNA diagnostics. 纳米级生物传感器集成温度调节控制器DNA诊断。

Seriya 3: Fizika, Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2320701

I. Tsiniaikin, G. Presnova, I. Bozhev, A. A. Skorik, M. Rubtsova, A. Trifonov, O. Snigirev, V. Krupenin, D. Presnov

{"title":"Nanoscale biosensor with integratedthermoregulation controller\u0000for DNA diagnostics.","authors":"I. Tsiniaikin, G. Presnova, I. Bozhev, A. A. Skorik, M. Rubtsova, A. Trifonov, O. Snigirev, V. Krupenin, D. Presnov","doi":"10.55959/msu0579-9392.78.2320701","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2320701","url":null,"abstract":"We present a CMOS compatible technique for fabrication a sensor system based on field-effect transistors\u0000with a nanowire channel with an integrated thermoregulation elements. The proposed system provides the\u0000necessary temperature regimes for many bioanalytical studies. Field-effect transistors with a nanowire channel\u0000were fabricated using of reactive-ion etching of the upper layer of a silicon on insulator through a mask formed\u0000by electron beam lithography. Titanium thermoresistive strips for temperature control were located on the\u0000surface of the chip nearby to the nanowire transistors. Their fabrication is carried out simultaneously with the\u0000formation of contact pads to the transistor electrodes, which made it possible to avoid additional technological\u0000steps. A demonstration of a system with a built-in temperature controller for the determination of nucleic\u0000acids was carried out on model oligonucleotides. Increasing the operating temperature of the device to the\u0000ranges at which DNA hybridization occurs most efficiently allows increasing specificity and avoiding false\u0000positive results, as well as reducing analysis time. The possibility of heating up to 85–90∘C allows you to\u0000reuse such devices.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126096059","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

Nanostructured coatings based on titanium for electrodesof electrochemical devices with proton exchange membrane 质子交换膜电化学装置电极用钛纳米结构涂层

Seriya 3: Fizika, Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2320501

M. V. Sinyakov, A. A. Zasypkina, V. V. Tishkin, N. A. Ivanova, E. Vorobyeva, O. K. Alekseeva

{"title":"Nanostructured coatings based on titanium for electrodes\u0000of electrochemical devices with proton exchange membrane","authors":"M. V. Sinyakov, A. A. Zasypkina, V. V. Tishkin, N. A. Ivanova, E. Vorobyeva, O. K. Alekseeva","doi":"10.55959/msu0579-9392.78.2320501","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2320501","url":null,"abstract":"During the operation of electrochemical devices with a proton-exchange membrane under the action of\u0000oxygen, the electrode is gradually destroyed and degraded from the anode side. It is possible to increase the performance and service life of electrodes of electrochemical devices by applying Ti-based protective\u0000coatings to the surface of current collectors. In this work, nanostructured films of the compositions Ti, TiO𝑥,\u0000TiN𝑦, TiO𝑥N𝑦 were obtained by magnetron sputtering of a titanium target under various conditions. The\u0000structure and composition of the samples were studied by scanning electron microscopy, energy dispersive\u0000X-ray spectroscopy, and X-ray diffraction phase analysis. The effect of various modes and conditions of\u0000magnetron sputtering on the composition and structure of titanium coatings has been established. The service\u0000life of an electrode coated with the TiN𝑦 composition in the electrolyzer mode is 2 times higher than the\u0000service life of an anode without a coating under similar conditions with comparable efficiency","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126489733","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

Сolor transformation between photometric systems of 2MASS catalogand ASTRONIRCAM of SAI MSU 2.5-m telescope Сolor 2MASS星表测光系统与SAI MSU 2.5 m望远镜ASTRONIRCAM的转换

Seriya 3: Fizika, Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2320801

A. Tatarnikov, A. Tatarnikov

引用次数: 0

Optimization of electrodynamic characteristics of the linear electron accelerator at an energy 8–50 MeV with injection from an electron source based on cluster plasma systems 基于团簇等离子体系统的8-50 MeV电子源注入线性电子加速器电动力学特性优化

Seriya 3: Fizika, Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2310402

I. A. Ashanina, Yulia D. Kluchevskaia, S. Polozov, V. I. Rashchikovd

{"title":"Optimization of electrodynamic characteristics of the linear electron accelerator at an energy 8–50 MeV with injection from an electron source based on cluster plasma systems","authors":"I. A. Ashanina, Yulia D. Kluchevskaia, S. Polozov, V. I. Rashchikovd","doi":"10.55959/msu0579-9392.78.2310402","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2310402","url":null,"abstract":"One of the key problems of contemporary accelerator physics has been an increase of the rate of the energy\u0000gain in linear electron accelerators. The physical limits of the accelerating field intensity for the normal and\u0000superconducting accelerating structures have been practically reached; therefore, new acceleration schemes are\u0000being considered, primarily acceleration in plasma and wakefield acceleration. It is suggested to consider an\u0000opportunity using of a bunch generated in a laser-plasma channel for injection into a traditional metal structure.\u0000It has been shown that an electron source based on a cluster plasma can generate a short (from 0.1 to 1.0 ps)\u0000electron bunch with an energy of several hundred keV, which makes it possible to consider such a source as\u0000an alternative to a photocathode. Next, the beam must be captured in the acceleration mode and accelerated up\u0000to an energy of 50 MeV with the possibility of energy tuning. The features of such accelerator, the features\u0000of the electron bunch capturing in the acceleration mode, and the possible values of the energy spectrum\u0000in such a system will considered. The features of such a source, including the possible energy spectrum, the features of the electron bunch capturing with an extremely wide spectrum in the acceleration mode,\u0000as well as the electrodynamic characteristics of the accelerating structures are considered in the paper. The\u0000beam dynamics simulation was carried out using the BEAMDULAC package developed at the Department\u0000of Electrophysical Facilities of the National Research Nuclear University MEPhI. The main results of the\u0000optimization of electrodynamic characteristics of the accelerating structures was also reported.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131256332","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