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Centrifuge model test on performance of thermosyphon cooled sandbags stabilizing warm oil pipeline buried in permafrost

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Research in Cold and Arid Regions 2021年第3期13卷 234-255页

作者： GuoYu Li HongYuan Jing nikolay Volkov Wei Ma PengChao Chen State Key Laboratory of Frozen Soil Engineering(SKLFSE) Northwest Institute of Eco-Environment and Resources(NIEER)Chinese Academy of Sciences(CAS)LanzhouGansu 730000China Da Xing'anling Observation and Research Station of Frozen-ground Engineering and Environment NIEERCASJiagedaqiHeilongjiang 165000China PipeChina North Pipeline Company LangfangHebei 065000China GEOINGSERVICE LLP(Fugro Group) 29 Vernadskogo AvenueMoscowRussia

The thaw settlement of pipeline foundation soils in response to the operation of the first China-Russia Crude Oil Pipeline along the eastern flank of the northern Da Xing'anling Mountains in Northeast China was simulated in a physical model test(with a similitude ratio of 1/73) in a geotechnical centrifuge. Two pipes of a supported and an unsupported section were evaluated over a testing period for simulating 20 years of actual pipeline operation with seasonal cyclically changing oil and ambient temperatures. The results show that pipe settlement of the supported pipe was 45% of settlement of the unsupported pipe. Settlement for the unsupported section was approximately 35% of the thaw bulb depth below the initial pipe elevation, only 30% of that for the supported pipe due to the influence of the supports. The final thaw bulbs extended approximately 3.6 and 1.6 times of the pipe diameter below the unsupported and supported pipe bottom elevations, respectively. The sandbag supports kept frozen during the test period because of cooling effect of the thermosyphons. The maximum bending stress induced over the 20 m span length from bearing of the full cover over the pipe would be equivalent to40% specified minimum yield strength(SMYS). Potential buckling of the pipe should be considered as the ground *** study also offers important data for calibration and validation of numerical simulation models.

关键词： centrifuge test oil pipeline frost heave thermosyphon thaw settlement permafrost engineering

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Multiphase flow dynamics=多项流动力学. Vol. 2, Mechanical and thermal interactions =力学与热相互作用 nikolay ***.

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2002年

作者： nikolay I.Kolev.

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LIGHT-INDUCED FLUORESCENCE SPECTROSCOPY AND OPTICAL COHERENCE TOMOGRAPHY OF BASAL CELL CARCINOMA

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Journal of Innovative Optical Health Sciences 2009年第3期2卷 261-268页

作者： EKATERINA BORISOVA ELFRIDA CARSTEA LUMINITA CRISTESCU ELMIRA PAVLOVA nikolay HADJIOLOV PETRANKA TROYANOVA LATCHEZAR AVRAMOV Institute of Electronics Bulgarian Academy of Sciences 72Tsarigradsko Chaussee Blvd.1784 SofiaBulgaria National Institute for Optoelectronics Atomistilor 409077125 MagureleRomania National Oncological Center 6Plovdivsko Pole Str.1156 SofiaBulgaria

Many up-to-date optical techniques have been developed and applied recently in clinical practice for obtaining qualitatively and quantitatively new data from the investigated *** to their high sensitivity in detection of small changes,these techniques are widely used for detection of early changes in biological ***-induced fluorescence spectroscopy(LIFS)is one of the most promising techniques for early detection of cutaneous *** number of recent publications have suggested that optical coherence tomography(OCT)also has potential for non-invasive diagnosis of skin *** recent work is a part of clinical trial procedure for introduction of LIFS technique into the common medical practice in National Oncological Medical Center in Bulgaria for diagnosis of non-melanoma skin *** focus our attention here on basal cell carcinoma lesions and their specific features revealed by LIFS and OCT *** this paper we prove the efficiency of using the combined LIFS-OCT method in skin lesions studies by integrating the complimentary qualities of each particular *** LIFS measurements several excitation sources,each emitting at 365,385 and 405 nm maxima are *** associated microspectrometer detects in vivo the fluorescence signals from human *** main spectral features of the lesions and normal skin are discussed and their possible origins are *** images are used to evaluate the lesion thickness,structure and severity stage,when *** obtained results could be used to develop a more complete picture of optical properties of these widely spread skin *** the same time,our studies show that the combined LIFS-OCT method could be introduced in clinical algorithms for early tumor detection and differentiation between normal/benign/malignant skin lesions.

关键词： Cutaneous fluorescence OCT BCC images endogenous porphyrins skin cancer

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Left atrial appendage aneurysm: A case report

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World Journal of Clinical Cases 2020年第19期8卷 4443-4449页

作者： Dmitry Vladimirovich Belov Vladimir Ivanovich Moskalev Dmitry Victorovich Garbuzenko nikolay Olegovich Arefyev Department of Hospital Surgery South Ural State Medical UniversityChelyabinsk 454092Russia Department of Hospital Surgery Federal Center for Cardiovascular SurgeryChelyabinsk 454033Russia Department of Faculty Surgery South Ural State Medical UniversityChelyabinsk 454092Russia Department of Pathological Anatomy and Forensic Medicine South Ural State Medical UniversityChelyabinsk 454092Russia

BACKGROUND An aneurysm of the left atrial appendage is one of the rare but potentially hazardous heart *** risk of lethal complications grows with its *** date,about 150 cases of this defect have been described in the *** present a case of left atrial appendage aneurysm with the deformation of the mitral valve and the left main coronary and circumflex artery,which required mitral valve annuloplasty and bifurcation *** SUMMARY A 58-year-old man presented to our hospital complaining of shortness of breath,general weakness,dizziness during physical exertion,and *** on the results of echocardiography,an aneurysm of the left atrium was suspected.A free-breathing real-time cine magnetic resonance imaging with electrocardiograph synchronization confirmed the diagnosis of left atrial appendage *** patient underwent an aneurysmectomy via a median sternotomy with cardiopulmonary *** transesophageal echocardiography revealed relative mitral insufficiency that was corrected with an annuloplasty *** coronary angiogram showed impaired blood flow in the left main coronary and circumflex artery and 60%*** this reason,bifurcation stenting was *** patient had an uneventful postoperative clinical course and was discharged from the hospital on the 10th day in a satisfactory *** Left atrial appendage aneurysm is a rare and dangerous heart pathology that requires surgery to prevent related complications.

关键词： Atrial appendage Aneurysm Mitral valve insufficiency Coronary stenosis Catheter ablation Case report

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The magnetic response of graphene split-ring metamaterials

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Light(Science & Applications) 2013年第1期2卷 124-127页

作者： Nikitas Papasimakis Sukosin Thongrattanasiri nikolay I Zheludev FJ Garcıa de Abajo Optoelectronics Research Centre and Centre for Photonic Metamaterials University of SouthamptonSouthamptonUK IQFR–CSIC Serrano 11928006 MadridSpain Centre for Disruptive Photonic Technologies Nanyang Technological UniversitySingapore ICFO–Institut de Ciencies Fotoniques Mediterranean Technology Park08860 Castelldefels(Barcelona)Spain

Graphene has emerged as a promising platform for THz plasmonics,allowing high confinement,long lifetimes and fast electrical ***,we predict a strong magnetic dipole response by graphene split nanorings at THz frequencies,allowing the attainment of metamaterials with a high degree of field confinement(approximately one hundredth of the excitation wavelength)that is not reachable with conventional noble *** magnetic response of highly doped graphene split-rings in the far-infrared is much stronger than that displayed by gold structures of similar *** further explored stacked graphene layers as a practical way of producing high-frequency magnetism in thin,electrically tunable *** results support the great potential of using graphene to achieve electrically tunable magnetic metamaterials.

关键词： artificial magnetism graphene graphene plasmons metamaterials plasmonics

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Wavevector Selective Metasurfaces and Tunnel Vision Filters

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Light(Science & Applications) 2015年第1期4卷 301-305页

作者： Vassili A Fedotov Jan Wallauer Markus Walther Mauro Perino Nikitas Papasimakis nikolay I Zheludev Optoelectronics Research Centre and Centre for Photonic Metamaterials University of SouthamptonSouthamptonSO171BJUK Department of Molecular and Optical Physics University of FreiburgD-79104 FreiburgGermany Department of Information Engineering University of PadovaPadovaItaly Centre for Disruptive Photonic Technologies TPINanyang Technological University637371 SingaporeSingapore

Metasurfaces offer unprecedented flexibility in the design and control of light propagation,replacing bulk optical components and exhibiting exotic optical *** of the basic properties of the metasurfaces,which renders them as frequency selective surfaces,is the ability to transmit or reflect radiation within a narrow frequency band that can be engineered on *** we introduce and demonstrate experimentally in the THz domain the concept of wavevector selective surfaces–metasurfaces transparent only within a narrow range of light propagation directions operating effectively as tunnel vision *** implementations of the new concept include applications in wavefront manipulation,observational instruments,vision and free-space communication in light-scattering environments.

关键词： flat optics metafilms metasurfaces planar metamaterials wavefront manipulation

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An Approach for Searching Insertions in Bacterial Genes Leading to the Phase Shift of Triplet Periodicity

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Genomics, Proteomics & Bioinformatics 2011年第4期9卷 158-170页

作者： Maria A. Korotkova nikolay A. Kudryashov Eugene V. Korotkov Centre of Bioengineering Russian Academy of Sciences National University of Nuclear Investigations (MIFI)

The concept of the phase shift of triplet periodicity （TP） was used for searching potential DNA insertions in genes from 17 bacterial genomes. A mathematical algorithm for detection of these insertions has been developed. This approach can detect potential insertions and deletions with lengths that are not multiples of three bases, especially insertions of relatively large DNA fragments （〉 100 bases）. New similarity measure between triplet matrixes was employed to improve the sensitivity for detecting the TP phase shift. Sequences of 17,220 bacterial genes with each consisting of more than 1,200 bases were analyzed, and the presence of a TP phase shift has been shown in -16% of analysed genes （2,809 genes）, which is about 4 times more than that detected in our previous work. We propose that shifts of the TP phase may indicate the shifts of reading frame in genes after insertions of the DNA fragments with lengths that are not multiples of three bases. A relationship between the phase shifts of TP and the frame shifts in genes is discussed.

关键词： triplet periodicity insertion gene sequence reading frame phase shift change-point problem

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Effect of 0.3% Sc on microstructure, phase composition and hardening of Al-Ca-Si eutectic alloys

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Transactions of Nonferrous Metals Society of China 2017年第4期27卷 741-746页

作者： nikolay BELOV Evgenia NAUMOVA Torgom AKOPYAN National University of Science and Technology MISIS 4 Leninskiy pr. 4 Moscow 119049 Russia Institute of Russian Academy of Sciences A. A. Baikov Institute of Metallurgy and Material Science RASLeninskiy pr. 49 Moscow 119991 Russia

The phase composition,microstructure and hardening of aluminum-based experimental alloys containing0.3%Sc,0?14%Si and0?10%Ca(mass fraction)were *** experimental study(electron microscopy,thermal analysis and hardnessmeasurements)was combined with Thermo-Calc software simulation for the optimization of the alloy *** wasdetermined that the maximum hardening corresponded to the annealing at300?350°С,which was due to the precipitation of Al3Scnanoparticles with their further *** alloys falling into the phase region(Al)+Al4Ca+Al2Si2Ca have demonstrated asignificant hardening *** ternary eutectic(Al)+Al4Ca+Al2Si2Ca had a much finer microstructure as compared to the Al?Sieutectic,which suggests a possibility of reaching higher mechanical properties as compared to commercial alloys of the *** commercial alloys of the A356type,the model alloy does not require quenching,as hardening particles are formed in thecourse of annealing of castings.

关键词： Al-Ca-Si-Sc system alloy eutectic Al3Sc nanoparticles phase composition microstructure heat treatment hardening

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Two-dimensional control of light with light on metasurfaces

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Light(Science & Applications) 2016年第1期5卷 826-830页

作者： Maria Papaioannou Eric Plum João Valente Edward TF Rogers nikolay I Zheludev Optoelectronics Research Centre and Centre for Photonic Metamaterials University of SouthamptonHighfieldSouthampton SO171BJUK Institute for Life Sciences University of SouthamptonHighfieldSouthampton SO171BJUK The Photonics Institute and Centre for Disruptive Photonic Technologies Nanyang Technological UniversitySingapore 637371Singapore

The ability to control the wavefront of light is fundamental to focusing and redistribution of light,enabling many applications from imaging to *** interaction on highly nonlinear photorefractive materials is essentially the only established technology allowing the dynamic control of the wavefront of a light beam with another beam of light,but it is slow and requires large optical *** we report a proof-of-principle demonstration of a new technology for two-dimensional(2D)control of light with light based on the coherent interaction of optical beams on highly absorbing plasmonic *** illustrate this by performing 2D all-optical logical operations(AND,XOR and OR)and image *** approach offers diffractionlimited resolution,potentially at arbitrarily-low intensity levels and with 100 THz bandwidth,thus promising new applications in space-division multiplexing,adaptive optics,image correction,processing and recognition,2D binary optical data processing and reconfigurable optical devices.

关键词： all-optical data processing all-optical image processing coherent control metasurfaces

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Ruthenium-mediated assembly and enhanced stability of heterometallic polystannides[Ru_(2)Sn_(19)]^(4−)and[Ru_(2)Sn_(20)]^(6−)

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Nano Research 2022年第6期15卷 5705-5711页

作者： Wei-Xing Chen nikolay V.Tkachenko Alvaro Muñoz-Castro Alexander I.Boldyrev Zhong-Ming Sun State Key Laboratory of Elemento-Organic Chemistry Tianjin Key Lab of Rare Earth Materials and ApplicationsSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China Department of Chemistry and Biochemistry Utah State University0300 Old Main HillLoganUT 84322-0300USA Grupo de Química Inorgánicay Materiales Moleculares Facultad de IngenieriaUniversidad Autonoma de ChileEl Llano SubercaseauxSantiago 2801Chile

In this work,we report the synthesis and characterization of two novel Ru-containing Zintl clusters:[Sn_(19){Ru(COD)(en)}_(2)]^(4−)and[Sn_(20){Ru(COD)}_(2)]^(6−).The synthesized compounds not only expand the family of Ru-Sn cluster systems but also shed light on the structure of heterometallic complexes in a previously unknown range of tin *** single-crystal X-ray diffraction(XRD)analysis reveals the dimeric nature of the *** different assembly patterns of the formal[Sn(η^(3)-Sn_(9))]monomer were observed:the dimerization through the vertex fusion process and the direct dimerization through the formation of 2c–2e Sn–Snσ*** both clusters,the density functional theory calculations reveal the locallyσ-aromatic nature of the[Sn(η^(3)-Sn_(9))]monomer resulting in two independent magnetic shielding *** believe that our findings will help the community to further explore the fascinating chemistry of polystannide clusters.

关键词： heterometallic clusters aromaticity polystannide ruthenium Zintl anion

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