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Impact of doping profiles on the formation of laser-active centers in bismuth-doped GeO_(2)–SiO_(2)glass fibers

Photonics Research 2024年第2期12卷 260-270页

作者： SERGEY ALYSHEV ALEXANDER VAKHRUSHEV ALEKSANDR KHEGAI ELENA FIRSTOVA KONSTANTIN RIUMKIN MIKHAIL MELKUMOV lyudmila iskhakova ANDREY UMNIKOV SERGEI FIRSTOV Prokhorov General Physics Institute of the Russian Academy of Sciences Dianov Fiber Optics Research Center119333 MoscowRussia Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences 603951 Nizhny NovgorodRussia

Multi-wavelength-band transmission technology based on the exploitation of the extended spectral region is considered as a potential approach to increase the transmission capacity in the deployed fiber-optic communication *** development of optical amplifiers operating in the O-,E-,S-,and U-telecom bands is an extremely important challenge for the successful implementation of this ***-doped fibers are of increasing interest as gain materials,which can be used to provide broadband amplification in the mentioned telecom *** is due to the ability of Bi ions incorporated into glass network to form bismuth active centers(BACs)with specific optical properties,which are primarily determined by the glass *** this work,the impact of the doping profiles of both Ge atoms as glass modifiers and Bi ions on the BACs formation is studied using a series of bismuth-doped fibers fabricated by the modified chemical vapor deposition(MCVD)*** Bi-to-BACs conversion efficiency in various spatial regions of the studied samples is *** is turned out that for high-Bi concentration regions,the conversion efficiency is very low(less than 10%).In addition,the relationship of the conversion efficiency to the distribution of Bi ions and/or Ge atoms is ***,a continuous-wave laser at 1.46μm with a record slope efficiency of 80%is demonstrated using a Bi-doped fiber with confined doping profile,where the Bi-to-BACs conversion efficiency is 35%.This paper provides new information which might help to facilitate understanding of the features of Bi-doped fibers and their potentially achievable characteristics.

关键词： fiber fibers bismuth

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Terahertz high-sensitivity SIS mixer based on Nb–AlN–NbN hybrid superconducting tunnel junctions

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Chinese Physics B 2024年第5期33卷 681-686页

作者：刘博梁刘冬姚明金骏达王争李婧史生才 Artem Chekushkin Michael Fominsky lyudmila Filippenko Valery Koshelets Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China Kotel'nikov Institute of Radio Engineering and Electronics Russian Academy of SciencesMoscow 125009Russia

The terahertz band,a unique segment of the electromagnetic spectrum,is crucial for observing the cold,dark universe and plays a pivotal role in cutting-edge scientific research,including the study of cosmic environments that support life and imaging black ***-sensitivity superconductor–insulator–superconductor(SIS)mixers are essential detectors for terahertz astronomical telescopes and interferometric *** to the commonly used classical Nb/AlO_(x)/Nb superconducting tunnel junction,the Nb/AlN/NbN hybrid superconducting tunnel junction has a higher energy gap voltage and can achieve a higher critical current *** makes it particularly promising for the development of ultra-wideband,high-sensitivity coherent detectors or mixers in various scientific research *** this paper,we present a superconducting SIS mixer based on Nb/AlN/NbN parallel-connected twin junctions(PCTJ),which has a bandwidth extending up to490 GHz–720 *** best achieved double-sideband(DSB)noise temperature(sensitivity)is below three times the quantum noise level.

关键词： SIS mixer terahertz gap voltage critical current density hybrid superconducting tunnel junction

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Physico−mathematical model of the voltage−current characteristics of light-emitting diodes with quantum wells based on the Sah−Noyce−Shockley recombination mechanism

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Journal of Semiconductors 2024年第8期45卷 25-33页

作者： Fedor I.Manyakhin Dmitry O.Varlamov Vladimir P.Krylov lyudmila O.Morketsova Arkady A.Skvortsov Vladimir K.Nikolaev Dinamics Strength of Machines and Resisance of MaterialsMoscow Polytechnic UniversityRussia Biomedical and Electronic Means and Technologies Vladimir State UniversityRussia Computer-Aided Design and Engineering National University of Science and Technology"MISiS"Russia

Herein,a physical and mathematical model of the voltage−current characteristics of a p−n heterostructure with quantum wells(QWs)is prepared using the Sah−Noyce−Shockley(SNS)recombination mechanism to show the SNS recombination rate of the correction function of the distribution of QWs in the space charge region of diode configuration.A comparison of the model voltage−current characteristics(VCCs)with the experimental ones reveals their *** technological parameters of the structure of the VCC model are determined experimentally using a nondestructive capacitive approach for determining the impurity distribution profile in the active region of the diode structure with a profile depth resolution of up to 10Å.The correction function in the expression of the recombination rate shows the possibility of determining the derivative of the VCCs of structures with QWs with a nonideality factor of up to 4.

关键词： light-emitting diodes with quantum wells voltage−current relation nonideality factor recombination mechanism Sah−Noyce−Shockley model

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A rare case of cardiac and ophthalmic manifestations of meningococcal septicemia

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World Journal of Emergency Medicine 2024年第4期15卷 328-330页

作者： Svetlana Rachina Anastasia Shchendrygina Heshan Radeesha de Silva Svetlana Tarasenko Nadezhda Mukhina Irina Komarova Ludmila Fedina Elena Burmistrova Elvira Martens Sergey Sidorenko Vladimir Gostev Dmitry Polev Alina Saitova lyudmila Kraeva Nikita Goncharov Irina Zvetkova Department of Hospital Therapy I M Sechenov First Moscow State Medical UniversityMoscow 119048Russia Outpatient Clinic#64 Moscow 119048Russia Department of Cardiology City Clinical Hospital n.a.S.S.YudinMoscow 119048Russia Department of Medical Microbiology and Molecular Epidemiology Pediatric Research and Clinical Center for InfectiousDiseasesSaint Petersburg 197022Russia Department of Medical Microbiology North-Western State Medical University Named After I.I.MechnikovSaintPetersburg 191015Russia Department of Epidemiology Saint-Petersburg Pasteur InstituteSaint Petersburg 197101Russia

Acute pericarditis is usually a self-limiting disorder that commonly occurs due to viral etiology or unexplained *** pericarditis(MP)is a remarkably uncommon clinical entity that manifests as a complication during the acute or convalescent phase of meningococcal ***,its occurrence within the context of meningococcal septicemia has also been *** report a rare case of a previously healthy male patient who developed both acute pericarditis and uveitis as a presentation of meningococcal septicemia,with no characteristic skin rashes or meningeal signs.

关键词： acute Acute rare

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Caspian Energy Ring: Prospective vision

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Global Energy Interconnection 2022年第5期5卷 461-471页

作者： Sergei Podkovalnikov lyudmila Chudinova Ivan L.Trofimov Leonid Trofimov Melentiev Energy Systems Institute of Siberian Branch of the Russian Academy of Sciences 130Lermontov Str.Irkutsk664033Russia

This paper presents the results of a technical and economic optimization study of the prospects of the Caspian Energy Ring(CER),connecting power systems of Russia,countries of the Caucasus,Central Asia,and South *** CER,belonging partly to the emerging Asian Supergrid and partly to the existing European Supergrid,will become a bridge connecting these supergrids,laying the foundation for forming a global energy interconnection in the long *** expansion of carbon-free renewable and nuclear facilities,low-carbon gas-fired power plants,and traditional thermal and hydro energy sources within the CER were considered in this *** positive economic benefits of the creation of the CER are *** characteristics of the potential CER were also estimated.

关键词： Caspian Energy Ring Interstate electric power grids Transmission lines Installed capacity Power generation Economic viability.

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Ultrathin Metal Silicate Hydroxide Nanosheets with Moderate Metal-Oxygen Covalency Enables Efficient Oxygen Evolution

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Energy & Environmental Materials 2022年第1期5卷 231-237页

作者： Jiexin Zhu Shikun Li Zechao Zhuang Shan Gao Xufeng Hong Xuelei Pan Ruohan Yu Liang Zhou lyudmila V.Moskaleva Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Institute of Applied and Physical Chemistry and Center for Environmental Research and Sustainable Technology University of Bremen Department of Chemistry University of the Free State Collage of Chemistry & Chemical Engineering Anhui University Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valleyfoshan guangdong 528200china

Exploring efficient,cost-effective,and durable electrocatalysts for electrochemical oxygen evolution reaction(OER)is pivotal for the large-scale application of water *** advance has demonstrated that the activity of electrocatalysts exhibits a strong dependence on the surface electronic ***,a series of ultrathin metal silicate hydroxide nanosheets(UMSHNs)M_(3)Si_(2)O_(5)(OH)_(4)(M=Fe,Co,and Ni)synthesized without surfactant are introduced as highly active OER *** silicate hydroxide nanosheets show an optimal OER activity with overpotentials of 287 and 358 m V at 1 and 10 m A cm^(-2),*** experimental and theoretical studies,it is found that the OER activity of UMSHNs is dominated by the metal-oxygen covalency(MOC).High OER activity can be achieved by having a moderate MOC as reflected by aσ^(*)-orbital(e_(g))filling near unity and moderate[3d]/[2p]***,the UMSHNs exhibit favorable chemical stability under oxidation *** contribution provides a scientific guidance for further development of active metal silicate hydroxide catalysts.

关键词： electrocatalysis metal silicate hydroxide metal-oxygen covalency oxygen evolution reaction ultrathin nanosheet

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The evolution of interstate power grid formation

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Global Energy Interconnection 2021年第4期4卷 335-353页

作者： Nikolai Voropai Sergei Podkovalnikov lyudmila Chudinova Melentiev Energy Systems Institute of Siberian Branch of the Russian Academy of Sciences 130Lermontov Str.Irkutsk 664033Russia

This study analyzes the process of electric power system integration in various regions *** process is implemented by creating both interstate electric ties and power *** analysis is comprehensive and examines the system,spatial,technical,organizational,and market aspects of the *** countries,including developed countries such as Europe and North America,as well as economically developing countries such as Central America and Africa,are involved in this ***,the rates and scales of electric power integration differ across various regions *** analysis shows that the process of electric power integration,which has decades of history,is still ongoing,despite the growth of other trends,such as the development of distributed *** electricity integration is expected to lead to the formation of a global power interconnection in the long term.

关键词： Interstate electric power grids/interconnections Interstate electric ties

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Viscosity of slags from the joint smelting of oxidized nickel and sulfide copper ores

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Transactions of Nonferrous Metals Society of China 2023年

作者： Alexander KLYUSHNIKOV Svetlana SERGEEVA Roza GULYAEVA Alexander VUSIKHIS lyudmila UDOEVA Stanislav TYUSHNYAKOV Laboratory of Non-Ferrous Metals Pyrometallurgy， Department of Non-Ferrous Metals， Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences 2. Laboratory of Rare Refractory Metals， Department of Non-Ferrous Metals， Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences

The work is devoted to the viscosity determination of molten slags from the joint smelting of oxidized nickel and sulfide copper ores. The model slags were synthesized close in composition and structure to real samples， and limiting the investigated composition range: iron-containing slag (8.9 wt.% CaO， 11.8 MgO， 12.5 Al2O3， 47.4 SiO2， 13.3 FeO， 5.0 Fe2O3) and iron-free slag formed by removing iron oxides from the iron-containing slag (12.5 wt.% CaO， 16.0 MgO， 9.4 Al2O3， 58.3 SiO2). The experimental (vibrational method) viscosity values for iron-containing (1550–1300 ℃) and iron-free (1550–1400 ℃) model slags were 3.1–23.3 and 12.8–45.5 dPa·s， respectively. Viscosity estimation by the Kalmanovitch–Frank model showed a discrepancy with the experimental data for iron-containing slag. Regression analysis (by Weimann–Frenkel–Urbain formalism) of the experimental data was carried out， and original empirical models were proposed to predict the primary model slags viscosity in the considered temperature range. Reducing the basicity from 0.7 (iron-containing slag) to 0.6 (iron-free slag) increased viscous flow activation energy from 204 to 236 kJ·mol–1. To maintain optimal slag viscosity， joint smelting of oxidized nickel and sulfide copper ores should be carried out at a temperature not lower than 1400 ℃.

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氧化镍和硫化铜矿联合熔炼炉渣的黏度

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Transactions of Nonferrous Metals Society of China 2023年第10期33卷 3168-3184页

作者： Alexander KLYUSHNIKOV Svetlana SERGEEVA Roza GULYAEVA Alexander VUSIKHIS lyudmila UDOEVA Stanislav TYUSHNYAKOV Laboratory of Non-Ferrous Metals Pyrometallurgy Department of Non-Ferrous MetalsInstitute of Metallurgy of the Ural Branch of the Russian Academy of Sciences101Amundsen StreetYekaterinburg 620016Russia Laboratory of Rare Refractory Metals Department of Non-Ferrous MetalsInstitute of Metallurgy of the Ural Branch of the Russian Academy of Sciences101Amundsen StreetYekaterinburg 620016Russia

测定氧化镍和硫化铜矿联合冶炼熔渣的黏度。制备的模拟熔渣与实际熔渣的成分和结构相似,并限制研究的熔渣的成分范围,含铁熔渣的成分(质量分数)为:8.9%CaO、11.8%MgO、12.5%Al_(2)O_(3)、47.4%SiO_(2)、13.3%FeO和5.0%Fe_(2)O_(3);无铁... 详细信息

测定氧化镍和硫化铜矿联合冶炼熔渣的黏度。制备的模拟熔渣与实际熔渣的成分和结构相似,并限制研究的熔渣的成分范围,含铁熔渣的成分(质量分数)为:8.9%CaO、11.8%MgO、12.5%Al_(2)O_(3)、47.4%SiO_(2)、13.3%FeO和5.0%Fe_(2)O_(3);无铁熔渣是将含铁熔渣中的氧化铁去除得到,其成分(质量分数)为:12.5%CaO、16.0%MgO、9.4%Al_(2)O_(3)和58.3%SiO_(2)。由振动法测试的含铁熔渣(1550~1300℃)和无铁熔渣(1550~1400℃)的黏度实验值分别为0.31~2.33 Pa·s和1.28~4.55 Pa·s。由Kalmanovitch-Frank模型预测的含铁熔渣的黏度值与实验值存在偏差。通过Weimann-Frenkel-Urbain方程对实验数据进行回归分析,提出可预测所考虑温度范围内的初级熔渣黏度的原始经验模型。当碱度从0.7(含铁熔渣)降低到0.6(无铁熔渣),黏性流动活化能从204 kJ/mol增加到236kJ/mol。为了保持最佳熔渣黏度,氧化镍和硫化铜矿联合冶炼的温度应不低于1400℃。

关键词：熔渣黏度振动式黏度计 Kalmanovitch–Frank模型 Weimann–Frenkel–Urbain方程氧化镍矿硫化铜矿造锍熔炼

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Chondroitin sulfate and glucosamine combination in patients with knee and hip osteoarthritis:A long-term observational study in Russia

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World Journal of Orthopedics 2023年第6期14卷 443-457页

作者： Alexander M Lila lyudmila I Alekseeva Andrey A Baranov Elena A Taskina Natalya G Kashevarova Natalia A Lapkina Evgeny A Trofimov Director Research Institute of Rheumatology Named after VA NasonovaMoscow 115522MoscowRussia Bone and Joints Metabolic Diseases Laboratory Research Institute of Rheumatology Named after VA NasonovaMoscow 115522MoscowRussia Department of Therapy Clinical Laboratory Diagnostics and Medical BiochemistryYaroslavl State Medical UniversityYaroslavl 150000YaroslavlRussia Department of Therapy and Rheumatology North-Western State Medical University named after I.I.MechnikovSt.Petersburg 191015St.PetersburgRussia

BACKGROUND Oral treatment of glucosamine(GA) combined with chondroitin sulfate(CS) was reportedly effective for pain relief and function improvement in osteoarthritis patients with moderate to severe knee pain in clinical trials. While the effectiveness of GA and CS on both clinical and radiological findings has been demonstrated, only a few high-quality trials exist. Therefore, controversy regarding their effectiveness in real-world clinical practice *** To investigate the impact of GA + CS on clinical outcomes of patients with knee and hip osteoarthritis in routine clinical *** A multicenter prospective observational cohort study included 1102 patients of both genders with knee or hip osteoarthritis(Kellgren & Lawrence grades Ⅰ-Ⅲ) in 51 clinical centers in the Russian Federation from November 20, 2017, to March 20,2020, who had started to receive oral capsules of glucosamine hydrochloride 500 mg and CS 400mg according to the approved patient information leaflet starting from 3 capsules daily for 3 wk,followed by a reduced dosage of 2 capsules daily before study inclusion(minimal recommended treatment duration is 3-6 mo). Changes in subscale scores [Pain, Symptoms, Function, and Quality of Life(QOL)] of the Knee Injury and Osteoarthritis Outcome Score(KOOS)/Hip Disability and Osteoarthritis Outcome Score(HOOS) questionnaires during the observational period(up to 54-64wk with a total of 4 visits). Patients’ treatment satisfaction, data on the combined oral use of glucosamine hydrochloride and CS, concomitant use of non-steroidal anti-inflammatory drugs(NSAIDs), and adverse events(AEs) were also *** A total of 1102 patients with knee and hip osteoarthritis were included in the study. The mean patient age was 60.4 years, most patients were women(87.8%), and their average body mass index was 29.49 kg/m2. All subscale scores(Pain, Symptoms, Function, and QOL) of the KOOS and HOOS demonstrated clinically and statistically significant im

关键词： Glucosamine Chondroitin sulfate Knee osteoarthritis Hip osteoarthritis Knee injury and osteoarthritis outcome score Hip disability and osteoarthritis outcome score

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