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Radiation of a TM mode from an open end of a three-layer dielectric capillary

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Chinese Physics B 2024年第7期33卷 311-318页

作者： Sergey NGalyamin Alexandr MAltmark St.petersburg State university 7/9Universitetskayanab.St.Petersburg 199034Russia St.petersburg electrotechnical university“leti” 5ProfessoraPopovaSt.Petersburg 197022Russia

Modern trends in beam-driven radiation sources include the interaction of Cherenkov wakefields in open-ended circular waveguides with complicated dielectric linings, with a three-layer dielectric capillary recently proposed to reduce radiation divergence being a representative example [Opt. Lett. 45 5416(2020)]. We present a rigorous approach that allows for an analytical description of the electromagnetic processes that occur when the structure is excited by a single waveguide TM mode. In other words, the corresponding canonical waveguide diffraction problem is solved in a rigorous formulation. This is a continuation of our previous papers which considered simpler cases with a homogeneous or two-layer dielectric filling. Here we use the same analytical approach based on the Wiener–Hopf–Fock technique and deal with the more complicated case of a three-layer dielectric lining. Using the obtained rigorous solution, we discuss the possibility of manipulating the far-field radiation pattern using a third layer made of a low permittivity material.

关键词： diffraction radiation open-ended waveguide Wiener–Hopf technique Cherenkov radiation

CO_(2) electrolysis to formic acid for carbon neutralization

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Green Energy & Environment 2024年第9期9卷 1333-1335页

作者： Kezhen Qi Shu-yuan Liu Yingjie Zhang Hui Zhang Vadim Popkov Oksana Almjasheva College of Pharmacy Dali UniversityDali671000China College of Agriculture and Biological Science Dali UniversityDali671000China School of Arts Minnan Normal UniversityZhangzhou363000China Hydrogen Energy Laboratory Ioffe InstituteSaint Petersburg194021Russia Department of Physical Chemistry Saint Petersburg Electrotechnical University“LETI”Saint Petersburg197022Russia

To avoid carbonate precipitation for CO_(2) electrolysis,developing CO_(2) conversion in an acid electrolyte is viewed as an ultimately challenging *** Nature,Xia et *** explored a proton-exchange membrane system for reducing CO_(2) to formic acid with a Pb±Pb SO_(4) composite catalyst derived from waste lead-acid batteries based on the lattice carbon activation *** to 93%Faradaic efficiency was realized when formic acid was produced by this technology.

关键词： CO_(2) electrolysis Proton-exchange membrane system Faradaic efficiency Carbon neutralization CO_(2) reduction reaction

An advanced theoretical approach to study super-multiperiod superlattices:theory vs experiments

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Journal of Semiconductors 2024年第2期45卷 57-66页

作者： Alexander Sergeevich Dashkov Semyon Andreevich Khakhulin Dmitrii Alekseevich Shapran Gennadii Fedorovich Glinskii Nikita Andreevich Kostromin Alexander Leonidovich Vasiliev Sergey Nikolayevich Yakunin Oleg Sergeevich Komkov Evgeniy Viktorovich Pirogov Maxim Sergeevich Sobolev Leonid Ivanovich Goray Alexei Dmitrievich Bouravleuv saint-petersburg electrotechnical university"leti" Saint Petersburg197022Russian Federation Alferov saint-petersburg National Research Academic university of the Russian Academy of Sciences Saint Petersburg194021RussiaFne deration saint petersburg Polytechnic university of Peter the Great Saint Petersburg195251Russian Federation Shubnikov Institute of Crystallography of Federal Scientific Research Centre“Crystallography and Photonics” Russian Academy of SciencesMoscow119333Russian Federation National Research Center‘Kurchatov Institute’ Moscow123182Russian Federation university associated with IA EAEC Saint Petersburg194044Russian Federation Institute for Analytical Instrumentation Saint Petersburg198095Russian Federation Ioffe Institute Saint Petersburg194021Russian Federation

A new theoretical method to study super-multiperiod superlattices has been *** method combines the precision of the 8-band kp-method with the flexibility of the shooting method and the Monte Carlo *** method was applied to examine the finest quality samples of super-multiperiod Al_(0.3)Ga_(0.7)As/GaAs superlattices grown by molecular beam *** express photoreflectance spectroscopy method was utilized to validate the proposed theoretical *** the first time,the accurate theoretical analysis of the energy band diagram of super-multiperiod superlattices with experimental verification has been *** proposed approach highly accurately determines transition peak positions and enables the calculation of the energy band diagram,transition energies,relaxation rates,and gain *** has achieved a remarkably low 5%error compared to the commonly used method,which typically results in a 25%error,and allowed to recover the superlattice *** retrieved intrinsic parameters of the samples aligned with XRD data and growth *** proposed method also accurately predicted the escape of the second energy level for quantum well thicknesses less than 5 nm,as was observed in photoreflectance *** new designs of THz light-emitting devices operating at room temperature were suggested by the developed method.

关键词： super-multiperiod superlattice photoreflectance spectroscopy Kane model kp-method energy band diagram light amplifiers

Discrimination of ventricular tachycardia and localization of its exit site using surface electrocardiography

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Journal of Geriatric Cardiology 2019年第4期16卷 362-377页

作者： Heber Ivan Condori Leandro Dmitry S Lebedev Evgeny N Mikhaylov Lang G.F. department of Internal Medicine Pavlov First Saint Petersburg State Medical UniversitySaint-PetersburgRussia Almazov National Medical Research Centre Saint-PetersburgRussia Department of Medical and Biotechnology Systems First Electrotechnical UniversitySaint-PetersburgRussia

Differential diagnosis of supraventricular tachycardia (SVT) and ventricular tachycardia (VT) is of paramount importance for appropriate patient management. Several diagnostic algorithms for discrimination of VT and SVT based on surface electrocardiogram (ECG) analysis have been proposed. Following established diagnosis of VT,a specific origination tachycardia site can be supposed according to QRS complex characteristics. This review aims to cover comprehensive and comparative description of the main VT diagnostic algorithms and to present ECG characteristics which permit to suggest the most common VT origination sites.

关键词： Arrhythmias Electrocardiogram Supraventricular Tachycardia Ventricular

The prognostic role of high-sensitivity C-reactive protein in patients with acute myocardial infarction

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Journal of Geriatric Cardiology 2020年第7期17卷 379-383页

作者： Ekaterina A Polyakova Evgeny N Mikhaylov Department of Faculty Therapy Pavlov First Saint-Petersburg State Medical UniversitySaint-PetersburgRussian Federation Metabolic Syndrome Laboratory Institute of EndocrinologyAlmazov National Medical Research CentreSaint-PetersburgRussian Federation Neuromodulation Lab and Arrhythmia Department Almazov National Medical Research CentreSaint PetersburgRussian Federation Department of Bioengineering Systems Saint-Petersburg Electrotechnical University“LETI”Saint PetersburgRussian Federation

1 Introduction Inflammation is one of the main mechanisms in the pathogenesis of atherosclerosis,and the interest to the evaluation of inflammatory biomarkers in coronary artery disease(CAD)has been increasing over the last decade.[1,2]Destabilization of chronic artery plaques,which leads to acute coronary syndromes,has been associated with inflammatory status.[1,3]。

关键词： Atrial fibrillation Coronary artery disease High sensitive C-reactive protein Myocardial infarction Prognosis

Microwave diagnostics of pulsed atmospheric discharge with electrolytic electrode and long-lived luminous formation in its afterglow

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High Voltage 2024年第1期9卷 127-136页

作者： Shixin Zhao Xingbao Lyu Aleksandr Astafiev Chengxun Yuan Lin Miao Jingfeng Yao Ying Wang Anatoly Kudryavtsev Aleksandr Chirtsov Gennadii Shabanov Zhongxiang Zhou School of Physics Harbin Institute of TechnologyHarbinChina Physics Department Saint Petersburg Electrotechnical University“LETI”St.PetersburgRussia Heilongjiang Provincial Key Laboratory of Plasma Physics and Application Technology HarbinChina Physics Department St.Petersburg State UniversitySt.PetersburgRussia Konstantinov petersburg Nuclear Physics Institute National Research Centre“Kurchatov Institute”GatchinaRussia

The Gatchina discharge phenomenon holds significant promise as a laboratory model for simulating ball ***,crucial aspects concerning the plasma components of the resulting afterglow remain ***,the measurement of the electron density,a critical parameter,has not been fully achieved thus *** this study,microwave diagnostics and video recording were employed during a pulsed Gatchina discharge,along with synchronous measurement of discharge current and *** antennas were positioned at different heights to enable separate diagnosis of the discharge and the ensuing long-lived *** findings revealed that during the active phase of the Gatchina discharge,the plasma density was substantial enough to cause reflection of an electromagnetic wave with a frequency of 20 GHz from this highly conductive *** the afterglow,the signal experienced only a moderate weakening of 10–20 percent,facilitating the determination of the time dependence of average electron density during the afterglow's passage between the two *** measurements verified the unusually slow plasma decay in the afterglow of the Gatchina discharge,suggesting the potential significance of chemi-ionisation processes involving long-lived(metastable)particles.

关键词： holds luminous electrolytic

Analytical model of non-uniform charge distribution within the gated region of GaN HEMTs

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Journal of Semiconductors 2023年第8期44卷 87-93页

作者： Amgad A.Al-Saman Eugeny A.Ryndin Xinchuan Zhang Yi Pei Fujiang Lin School of Microelectronics University of Science and Technology of ChinaHefei 230026China Dynax Semiconductor Inc. Suzhou 215300China Department of Micro-and Nanoelectronics Saint Petersburg Electrotechnical UniversitySaint Petersburg 197376Russia

A physics-based analytical expression that predicts the charge,electrical field and potential distributions along the gated region of the GaN HEMT channel has been *** the gradual channel approximation(GCA),the proposed model considers the non-uniform variation of the concentration under the gated region as a function of terminal applied *** addition,the model can capture the influence of mobility and channel temperature on the charge distribution *** comparison with the hydrodynamic(HD)numerical simulation showed a high agreement of the proposed model with numerical data for different bias conditions considering the self-heating and quantization of the electron *** ana-lytical nature of the model allows us to reduce the computational and time cost of the ***,it can be used as a core expression to develop a complete physics-based transistorⅣmodel without GCA limitation.

关键词： AlGaN/GaN(HEMTs) 2DEG charge distribution electron mobility hydrodynamic model channel temperature

Improving nutrition for the prevention of gestational diabetes:Current status and perspectives

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World Journal of Diabetes 2021年第9期12卷 1494-1506页

作者： Polina V Popova Evgenii A Pustozerov Aleksandra S Tkachuk Elena N Grineva Institute of Endocrinology Almazov National Medical Research CentreSaint Petersburg 194156Russia Department of Faculty Therapy Saint Petersburg Pavlov State Medical UniversitySaint Petersburg 197022Russia Department of Biomedical Engineering Saint Petersburg State Electrotechnical UniversitySaint Petersburg 197341Russia

Gestational diabetes mellitus(GDM)is a common complication of pregnancy and a serious public health *** carries significant risks of short-term and longterm adverse health effects for both mothers and their *** factors,especially modifiable risk factors,must be considered to prevent GDM and its *** studies have identified several nutritional and lifestyle factors associated with the risk of *** results of intervention studies examining the effects of diet and lifestyle on the prevention of GDM are *** in the study populations,types and intensity of intervention,time frame of the intervention,and diagnostic criteria for GDM may explain the heterogeneity in the results of intervention *** review provides an overview of new diets and other factors that may help prevent *** main results of epidemiological studies assessing the risk factors for GDM,as well as the results and methodological problems of intervention studies on the prevention of GDM and their meta-analyses,are *** addition,the evidence that gene and lifestyle interactions influence the development of GDM,as well as prospects for increasing the effectiveness of interventions designed to prevent GDM,including new data on the possible uses of personalized diet therapy,are highlighted.

关键词： Gestational diabetes mellitus Risk factors Nutrition Prevention Personalized medicine Postprandial glycemic response

Modern aspects of construction of information microwave therapy devices

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Natural Science 2013年第12期5卷 1230-1237页

作者： Stanislav N. Darovskih Evgenij P. Popechitelev Nadezhda V. Vdovina Ivan V. Novikov saint petersburg electrotechnical university “leti” Saint Petersburg Russian South Ural State university Chelyabinsk Russian

This article is devoted to presenting modern aspects of building information microwave therapy devices. And it presents an analysis of the existing problems of the organism homeostasis control by means of electromagnetic radiation. The new principles of synthesis of operating influences are formulated. On the basis of the thermodynamic approach is justified as a leading role modeling the space microwave background to restore disturbed homeostasis of the organism. The general patterns of development of the pathological process and possible mechanisms of corrective action of natural electromagnetic background are described. The implementation of the approach offered by the authors to constructing device information physiotherapy allowed creating high-performance hardware and software means for the prevention and treatment of a wide range of human diseases.

关键词： Information Microwave Therapy Homeostasis Electromagnetic Pollution Relict Radiation Electromagnetic Radiation