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Investigation of Oil Vapours in Hydro-Generator

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Journal of Power and Energy Engineering 2024年第3期12卷 19-30页

作者： Ekaterina Shubina dmitry Verkhovtsev Stanislav Gulay Andrey Lyamin Bureau for the Design of Hydro-Generators JSC “Power Machines” Saint Petersburg Russia Field Tests Department JSC “Power Machines” Saint Petersburg Russia

The article discusses engineering approaches to solving the problem of oil vapours in generators. Due to the design characteristics of each power plant, it is difficult to find a typical solution. Nevertheless, the article suggests ways to reduce the amount of oil mist. For their implementation, a calculation methodology based on the substitution scheme of the hydraulic path of the bearing support unit is created which takes into account the design features of the bearing and the parameters of the environment around the oil bath. The methodology employed is presented. The numerical method of modelling the aerodynamic fields of the entire hydro generator is used to estimate the air flows and pressures in the oil bath zone of the thrust bearing. Additionally, the method made it possible to track suspected oil particles that could get from the thrust-bearing bath into the surrounding area of the generator. Measures are proposed to reduce the level of oil mist through the competent design of the oil vapour removal system from the bearing bath.

关键词： Hydro-Generator Cooling Oil Mist Bearings Fluid Dynamics

Porous Shish-Kebab Structure Prepared from Oriented UHMWPE Films by Processing in Supercritical CO_(2)

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Chinese Journal of Polymer Science 2024年第1期42卷 97-104,I0009页

作者： Sergey A.Lermontov Aleksey V.Maksimkin Nataliya A.Sipyagina Tarek Dayyoub Alena N.Malkova Evgeniy A.Kolesnikov Elena A.Straumal Inna O.Gozhikova Saidkhodzha G.Nematulloev dmitry V.Telyshev Institute of Physiologically Active Compounds of the Russian Academy of Sciences Chernogolovka 142432Russia Institute for Bionic Technologies and Engineering I.M.Sechenov First Moscow State Medical University(Sechenov University)Moscow 19991Russia National University of Science and Technology"MISIS"Moscow 119049 Russia Institute of Biomedical Systems National Research University of Electronic TechnologyZelenogradMoscow 124498Russia

For the first time, a highly crystalline porous shish-kebab structure with a high degree of crystallinity was obtained by using a combination of two methods for the formation of porous polymeric materials. A treatment procedure using supercritical carbon dioxide(sc CO_(2))was carried out for oriented ultrahigh molecular weight polyethylene(UHMWPE) films, which provided special conditions for the crystallization of dissolved UHMWPE macromolecules on the surface of oriented UHMWPE crystals. The prepared porous materials were investigated by scanning electron microscopy(SEM) and differential scanning calorimetry(DSC). The particularity of the obtained porous shish-kebab is the absence of the amorphous phase between lamellar crystals(kebabs). The obtained pores had an oval shape, and they were oriented in the orientation direction of the UHMWPE macromolecules. The pore size ranged from 0.05 μm to 4 μm. Controlling the conditions for the crystallization of the UHMWPE macromolecules using supercritical CO_(2) gives the possibility to control the size of both lamellar disks and pores formed.

关键词： UHMWPE Supercritical CO_(2) Porous shish-kebab structure

浓度梯度掺杂实现BiFeO_(3)薄膜自极化

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无机材料学报 2024年第1期39卷 99-106,I0006,I0007页

作者：戴乐刘洋高轩王书豪宋雅婷唐明猛 dmitry V Karpinsky 刘丽莎汪尧进南京理工大学材料科学与工程学院南京210094 白俄罗斯国家科学院材料科学与应用研究中心白俄罗斯明斯克220072

BiFeO_(3)是一种非常有前途的无铅铁电材料,与大多数传统铁电材料相比,它具有更大的极化和更高的居里温度,为高温应用提供了可能。受到衬底强烈的夹持效应、较大的矫顽场和漏电流的影响,BiFeO_(3)薄膜难以被极化。自极化是解决这一问题... 详细信息

BiFeO_(3)是一种非常有前途的无铅铁电材料,与大多数传统铁电材料相比,它具有更大的极化和更高的居里温度,为高温应用提供了可能。受到衬底强烈的夹持效应、较大的矫顽场和漏电流的影响,BiFeO_(3)薄膜难以被极化。自极化是解决这一问题的可行方法。本研究采用溶胶-凝胶法在Pt(111)/Ti/SiO_(2)/Si衬底上生长了BiFeO_(3)薄膜,向上梯度薄膜(从衬底BiFeO_(3)过渡到薄膜表面Bi_(0.80)Ca_(0.20)FeO_(2.90))以及向下梯度薄膜(从衬底Bi_(0.80)Ca_(0.20)FeO_(2.90)过渡到薄膜表面BiFeO_(3))。通过细致地调控薄膜内部缺陷的定向分布形成内置电场,从而导致薄膜具有自极化特性。压电力显微镜结果表明:在BiFeO_(3)薄膜中,Ca的梯度方向可以调控自极化的方向。此外,类似二极管的单向导通特性验证了薄膜的自极化是由Ca的浓度梯度掺杂导致。X射线光电子能谱结果表明,氧空位的梯度分布导致的内置电场可能是造成自极化现象的原因。本研究为实现铁电薄膜的自极化提供了一种新的策略,并在以自极化的内置电场为驱动,提高光伏或光敏器件性能方面具有潜在的应用前景。

关键词：自极化梯度掺杂铁酸铋薄膜溶胶-凝胶法

单分散Cu-TCPP/Cu_(2)O杂化微球:一种具有优异电还原CO_(2)产C_(2)性能的级联电催化剂

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电化学（中英文） 2024年第1期30卷 36-45页

作者：万紫轩 Aidar Kuchkaev dmitry Yakhvarov 康雄武华南理工大学环境与能源学院新能源研究所广东广州510006 阿尔布佐夫有机与物理化学研究所俄罗斯联邦喀山420088 喀山联邦大学亚历山大·巴特列罗夫化学研究所俄罗斯联邦喀山420008

高效电还原CO_(2)(ECR)为有价值的多碳产物是解决CO_(2)排放问题的有效解决方案。基于卟啉的金属有机框架(MOFs)具有多孔结构和有序的活性位点,有望提高ECR生成多碳产物的选择性。本文制备了由铜-四(4-羧基)卟啉(Cu-TCPP)和Cu_(2)O组成... 详细信息

高效电还原CO_(2)(ECR)为有价值的多碳产物是解决CO_(2)排放问题的有效解决方案。基于卟啉的金属有机框架(MOFs)具有多孔结构和有序的活性位点,有望提高ECR生成多碳产物的选择性。本文制备了由铜-四(4-羧基)卟啉(Cu-TCPP)和Cu_(2)O组成的有机/无机杂化Cu-TCPP@Cu_(2)O电催化剂,其中TCPP在调控形貌方面起着重要作用。ECR过程中原位形成的Cu与Cu-TCPP(Cu-TCPP@Cu)结合可以抑制析氢,富集CO中间体,促进C-C偶联生成C2产物。多孔碳(PC)负载的Cu-TCPP@Cu在PC上被还原为Cu纳米簇,同时对C2产物具有较高的ECR活性和选择性。催化剂在–1.0 V时(相对于可逆氢电极),C_(2)产物法拉第效率为62.3%,部分电流密度为83.4 mA·cm^(-2),是纯Cu_(2)O和TCPP的7.6倍和13.1倍。本论文研究了催化剂形貌和杂化结构如何提高ECR生C_(2)产物的选择性,为高性能ECR催化剂的设计提供了新思路。

关键词：有机/无机杂化电催化剂四(4-羧基)卟啉氧化亚铜级联电催化剂

Cluster Analysis of the Roma-BZCAT Blazars

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Research in Astronomy and Astrophysics 2024年第5期24卷 117-139页

作者： dmitry O.Kudryavtsev Yulia V.Sotnikova Vladislav A.Stolyarov Timur V.Mufakharov Valery V.Vlasyuk Margarita L.Khabibullina Alexander G.Mikhailov Yulia V.Cherepkova Special Astrophysical Observatory of the Russian Academy of Sciences Nizhny Arkhyz 369167Russia Astrophysics Group Cavendish LaboratoryUniversity of CambridgeCambridge CB3 OHEUK Kazan Federal University 18 Kremlyovskaya StKazan 420008Russia

Based on the collected multiwavelength data, namely in the radio(NVSS, FIRST, RATAN-600), IR(WISE),optical(Pan-STARRS), UV(GALEX), and X-ray(ROSAT, Swift-XRT) ranges, we have performed a cluster analysis for the blazars of the Roma-BZCAT catalog. Using two machine learning methods, namely a combination of PCA with k-means clustering and Kohonen's self-organizing maps(SOMs), we have constructed an independent classification of the blazars(five classes) and compared the classes with the known Roma-BZCAT classification(FSRQs, BL Lacs, galaxy-dominated BL Lacs, and blazars of an uncertain type) as well as with the high synchrotron peaked(HSP) blazars from the 3HSP catalog and blazars from the TeVCat catalog. The obtained groups demonstrate concordance with the BL Lac/FSRQ classification along with a continuous character of the change in the properties. The group of HSP blazars stands out against the overall distribution. We examine the characteristics of the five groups and demonstrate distinctions in their spectral energy distribution shapes. The effectiveness of the clustering technique for objective analysis of multiparametric arrays of experimental data is demonstrated.

关键词： methods data analysis-galaxies active-(galaxies:)BL Lacertae objects general

Domain patterning in nonpolar cut PMN–PT by focused ion beam

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Journal of Advanced Dielectrics 2024年第2期14卷 83-89页

作者： Elena Pashnina dmitry Chezganov Alla Slautina Anton Turygin Andrei Ushakov Qingyuan Hu Xin Liu Zhuo Xu Xiaoyong Wei Vladimir Shur School of Natural Sciences and Mathematics Ural Federal University Yekaterinburg 620002 Russia Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric Research School of Electronic Science and Engineering Xi’an Jiaotong University Xi’an 710049 P.R.China

The formation of the ferroelectric domain structure as a result of irradiation by focused ion beam of[100]-cut 0.61Pb(Mg_(1/3)Nb_(2/3)TO_(3)–0.39PbTiO_(3)(PMN–PT)single crystals covered by surface artificial dielectric layer and with free surface was *** dot irradiation resulted in formation of the wedge-like domains grown along[001]*** irradiation of the free surface,the domains are mainly located under the surface,while at the irradiated surface with an artificial dielectric layer the domains are located at the *** was shown that the subsurface wedge-shaped part of the domain is unstable and completely disappears after a month due to spontaneous backswitching under the action of the residual depolarization *** revealed nonlinear dose dependence of the domain sizes was attributed to the distribution of the electric field using the point charge *** domain interaction for the distance between irradiated dots below 30m has been revealed in all *** was shown that the decrease of the distance between irradiated dots in the created domain row leads to an increase in the length of the central domains,which is explained by the contribution of all injected charges to the switching field.

关键词： Ion beam domain patterning dielectric layer domain interaction spontaneous backswitching domain engineering relaxor ferroelectric

Nonlinear Rydberg exciton-polaritons in Cu2O microcavities

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Light(Science & Applications) 2024年第4期13卷 619-627页

作者： Maxim Makhonin Anthonin Delphan Kok Wee Song Paul Walker Tommi Isoniemi Peter Claronino Konstantinos Orfanakis Sai Kiran Rajendran Hamid Ohadi Julian Heckötter Marc Assmann Manfred Bayer Alexander Tartakovskii Maurice Skolnick Oleksandr Kyriienko dmitry Krizhanovskii Department of Physics and Astronomy University of SheffieldSheffield S37RHUK. Department of Physics and Astronomy University of ExeterStocker RoadExeter EX44PYUK. SUPA School of Physics and AstronomyUniversity of St AndrewsSt Andrews KY169SSUK. Fakultät Physik TU DortmundAugust-Schmidt-Straße 444227 DortmundGermany

Rydberg excitons(analogues of Rydberg atoms in condensed matter systems)are highly excited bound electron-hole states with large Bohr *** interaction between them as well as exciton coupling to light may lead to strong optical nonlinearity,with applications in sensing and quantum information ***,we achieve strong effective photon–photon interactions(Kerr-like optical nonlinearity)via the Rydberg blockade phenomenon and the hybridisation of excitons and photons forming polaritons in a Cu2O-filled *** pulsed resonant excitation polariton resonance frequencies are renormalised due to the reduction of the photon-exciton coupling with increasing exciton *** analysis shows that the Rydberg blockade plays a major role in the experimentally observed scaling of the polariton nonlinearity coefficient as∝n4.4±1.8 for principal quantum numbers up to n=*** high principal quantum numbers studied in a polariton system for the first time are essential for realisation of high Rydberg optical nonlinearities,which paves the way towards quantum optical applications and fundamental studies of strongly correlated photonic(polaritonic)states in a solid state system.

关键词： density Rydberg polar

Light-activated tautomeric transition enhanced buried heterointerface for highly efficient and ultraviolet robust perovskite solar cells

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Science China Chemistry 2024年

作者： Sheng Jiang Shaobing Xiong Shuaifei Mao Yefan Zhang Dongyang Zhao Xiaomeng You Vladimir Gaishun dmitry Kovalenk Qinye Bao School of Physics and Electronic Science East China Normal University Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of OptoelectronicsFudan University Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Shanghai Key Laboratory of Magnetic Resonance East China Normal University Department of Physics and Information Technologies Francisk Skorina Gomel State University Collaborative Innovation Center of Extreme Optics Shanxi University

The buried heterointerface of perovskite solar cells（PSCs） suffers from serious nonradiative recombination and ultraviolet（UV）light stress, relentlessly limiting further increase in their power conversion efficiency and operational stability. Herein, we develop an emerging strategy of incorporating a thin UV-activated tautomeric transition layer onto underlying charge transport layer and then depositing perovskite layer to construct an efficient hole-selective buried heterojunction. It is revealed that the UV-activated tautomeric transition interlayer not only improves upper perovskite crystallinity, diminishes thermionic loss for collecting hole and passivates defect site at such buried contact that significantly promote charge transport and suppress nonradiative recombination, but also effectively protects adjacent perovskite from UV degradation through “UV sunscreen”effect. As a result, we report a remarkably enhanced efficiency of 24.76% compared to 22.02% of the control device. More importantly, the achieved high-efficiency PSC features excellent resistance against UV radiation at 365 nm of 100 and 850 mW cm-2, which are approximately 21 and 184 times of UV flux(4.6 mW cm-2) under AM 1.5G solar illumination. This work provides a promising approach of strengthening buried heterointerface for simultaneous realization of highly efficient and UV robust PSCs.

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A systematic review of cytoreductive prostatectomy outcomes and complications in oligometastatic disease

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Asian Journal of Urology 2024年第2期11卷 208-220页

作者： Andrey Morozov Leonid Chuvalov Mark Taratkin Mikhail Enikeev Leonid Rapoport Nirmish Singla Eric Barret Elena Poddubskaya Maria Borodina Georg Salomon Juan Gomez Rivas dmitry Enikeev Institute for Urology and Reproductive Health Sechenov UniversityMoscowRussia Young Academic Urologists EAUthe Netherlands Department of Urology James Buchanan Brady Urological InstituteThe Johns Hopkins University School of MedicineBaltimoreUSA Department of Urology Institut Mutualiste MontsourisParisFrance Sechenov University MoscowRussia Hertsen Moscow Oncology Research InstituteMoscowRussia Hertsen Moscow Oncology Research Institute MoscowRussia Martini Clinic University Medical Center Hamburg-EppendorfHamburgGermany Department of Urology Clinico San Carlos University HospitalMadridSpain Department of Urology Medical University of ViennaViennaAustria

Objective: To analyze outcomes and complications of cytoreductive prostatectomy (CRP) for oligometastatic prostate cancer (PCa) in order to elucidate its role in this ***: We performed a systematic literature search using three databases (Medline, Scopus, and Web of Science). The primary endpoints were oncologic outcomes. The secondary endpoints were complication rates and functional ***: In all studies, overall survival was better or at least comparable variable in the groups with CRP compared to no local treatment. The greatest benefit from CRP in 5-year overall survival in one study was 67.4% for CRP versus 22.5% for no local treatment. Cancer-specific survival (CSS) showed the same trend. Several authors found significant benefits from CSS in the CRP group: from 79% vs. 46% to 100% vs. 61%. CRP was a predictor of better CSS (hazard ratio 0.264, p=0.004). Positive surgical margin rates differed widely from 28.6% to 100.0%. Urinary continence in CRP versus RP for localized PCa was significantly lower (57.4% vs. 90.8%, p<0.0001). Severe incontinence occurred seldom (2.5%-18.6%). Total complication rates after CRP differed widely, from 7.0% to 43.6%. Rates of grades 1 and 2 events prevailed. Patients on ADT alone also showed a considerable number of complications varying from 5.9% to 57.7%.Conclusion: CRP improves medium-term cancer control in patients with oligometastatic PCa. The morbidity and complication rates of this surgery are comparable with other approaches, but postoperative incontinence rate is higher compared with RP for localized disease.

关键词： Systematicreview Prostatecancer Oligometastatic Bone metastases Cytoreductive prostatectomy