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95篇 您的检索式:作者名="Polina"
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1Bound states in the continuum and Fano resonances in the strong mode coupling regime显示文摘The study of resonant dielectric nanostructures with a high refractive index is a new research direction in the nanoscale optics and metamaterial-inspired nanophotonics.Because of the unique optically induced electric and magnetic Mie resonances,high-index nanoscale structures are expected to complement or even replace different plasmonic components in a range of potential applications.We study a strong coupling between modes of a single subwavelength high-index dielectric resonator and analyze the mode transformation and Fano resonances when the resonator’s aspect ratio varies.We demonstrate that strong mode coupling results in resonances with high-quality factors,which are related to the physics of bound states in the continuum when the radiative losses are almost suppressed due to the Friedrich–Wintgen scenario of destructive interference.We explain the physics of these states in terms of multipole decomposition,and show that their appearance is accompanied by a drastic change in the far-field radiation pattern.We reveal a fundamental link between the formation of the high-quality resonances and peculiarities of the Fano parameter in the scattering cross-section spectra.Our theoretical findings are confirmed by microwave experiments for the scattering of high-index cylindrical resonators with a tunable aspect ratio.The proposed mechanism of the strong mode coupling in single subwavelength high-index resonators accompanied by resonances with high-quality factors helps to extend substantially functionalities of all-dielectric nanophotonics,which opens horizons for active and passive nanoscale metadevices.Andrey A.Bogdanov Kirill LKoshelev Polina VKapitanova Mikhail VRybin Sergey AGladyshev Zarina FSadrieva Kirill BSamusev Yuri SKivshar a Mikhail FLimonov 2019Advanced Photonics2019,1,1:6
2Early Miocene flora of central Kazakhstan(Turgai Plateau) and its paleoenvironmental implications显示文摘The investigation of the fossil floras from the Turgai plateau (central Kazakhstan) contributes to a better understanding of the origin of the temperate Turgai type flora which spread to Kazakhstan and adjacent areas during the Oligocene-Miocene transition. In this paper, we present the results of a carpological and palynological study of the Kumyrtas flora collected from a flora-bearing horizon of the regional coalbearing Zhilanchik suite, dated to the Aquitanian period. Pollen analysis identified 33 taxa, with are dominated by angiosperms (about 73%) and reflect zonal vegetation. The high percentages of Betula (27%) and Pterocarya (7.5%) that were found in this flora allows comparisons with other Aquitanian floras of Kazakhstan. Based on descriptions of fossil fruits and seeds, we determined that 19 taxa were dominant;these taxa had meosphytic herbaceous components, suggesting mostly edaphic local conditions. The incongruence between the carpological and the pollen records suggests a significant taphonomical effect. Quantitative reconstruction of the palaeoclimate based on pollen records supports—and slightly extends—previous findings based on fossil leaf data, but contradicts findings deduced from the carpological record. Plant Functional Type (PFT) classification was used to characterize the vegetation patterns. Pollen records show that about 45% of diversity relates to the arboreal broadleaved deciduous components and ca. 35% to conifers. Fossil fruit and seed data indicate riverine vegetation with a high diversity of aquatic components and shrub stratum.Popova Svetlana Utescher Torsten Averyanova Anna Tarasevich Valentina Tropina Polina Xing Yaowu 2019Plant Diversity2019,41,3:3
3What will the future hold for artificial organs in the service of assisted reproduction: prospects and considerations显示文摘Assisted reproduction provides a wide spectrum of treatments and strategies addressing infertility.However,distinct groups of infertile patients with unexplained infertility,congenital disorders,and other complex cases pose a challenge in in vitro fertilization(IVF)practices.This special cohort of patients is associated with futile attempts,IVF overuse,and dead ends in management.Cutting edge research on animal models introduced this concept,along with the development of artificial organs with the aim to mimic the respective physiological functions in reproduction.Extrapolation on clinical application leads to the future use of infertility management in humans.To date,the successful clinical application of artificial reproductive organs in humans is not feasible because further animal model studies are required prior to clinical trials.The application of these artificial organs could provide a solution to infertility cases with no other options.This manuscript presents an overview on the current status,future prospects,and considerations on the potential clinical application of artificial ovary,uterus,and gametes in humans.This paper presents how the IVF practice landscape may be shaped and challenged in the future,along with the subsequent concerns in assisted reproductive treatments.Mara Simopoulou Konstantinos Sfakianoudis Petroula Tsioulou Anna Rapani Polina Giannelou Nikolaos Kiriakopoulos Agni Pantou Nikolaos Vlahos George Anifandis Stamatis Bolaris Konstantinos Pantos Michael Koutsilieri 2019Frontiers of Medicine2019,13,6:2
4Intracellular signaling and hepatocellular carcinoma显示文摘Polina Iakova Lubov Timchenko Nikolai A. Timchenko 2010Seminars in Cancer Biology2010,,1:2
5Influence of monovalent Bi^+doping on real composition,point defects,and photoluminescence in TlCdCl3 and TlCdI3 single crystals显示文摘The structural features and real compositions with point defects of Bi+-doped TlCdCl_3 and TlCdI_3 single crystals, grown by the Bridgman-Stockbarger technique, are first studied using the X-ray diffraction, X-ray synchrotron radiation, and EXAFS/XANES spectroscopy. In the structures of Bi^+-doped TlCdCl_3 and TlCdI_3 crystals, the Cd, Cl, and I sites are found to be defect-free. The vacancies in the Tl sites and interstitial Bi atoms located in the vicinity of the Tl sites are detected in the structures of both samples. In the Bi^+-doped TlCdCl_3, the presence of a small amount of Bi^+ ions in the Tl^+ sites is possible. The correlation between photoluminescence bands and point defects in the refined structures are determined. Photoluminescence spectra and decay kinetics of the Bi+-doped TlCdCl_3 and TlCdI_3 demonstrate that they are attractive materials for potential applications in photonics.Daria N.Vtyurina Polina A.Eistrikh-Geller Galina M.Kuz mlcheva Victor B.Rybakov Evgeny V.Khramov Irina A.Kaurova Dmitry Yu.Chernyshov Vladimir N.Korchak 2017Science China Materials2017,60,12:2
6The sythesis of unsymmetrical tetraarylporphyins on solid phases 显示文摘Clifford C L Polina I S 1978Angew Chem Int Ed Engl1978,17,12:2
7Apoptosis and prolifenation in thyroid carcinoma:Correlation with bcl-2 and p53 protein expression 显示文摘Basolo F Polina L Fontanini C 1997Br J Cancer1997,75,:1
8MRgFUS treatment of uterine fi-broid in a nulliparous woman with acute retention of urine显示文摘Nyapathy V Polina L 2012J Radiol Case Rep2012,6,2:1
9MRgFUS treatment of uterine fibroid in a nulliparous woman with acute retention of urine显示文摘Nyapathy V Polina L 2012J Radiol Case Rep2012,6,2:1
10Effect of comonomer composition on the controlled free radical copolymerization of styrene and maleic anhydride by reversible addition fragmentation chain transfer显示文摘Elena C Polina T Chuong B 2003Polymer2003,,44:1
11The effect of folate-related SNPs on clinicopathological features, response to neoadjuvant treatment and survival in pre- and postmenopausal breast cancer patients显示文摘Nataliya Babyshkina Elena Malinovskaya Mariya Nazarenko Mariya Koval Polina Gervas Olga Potapova Elena Slonimskaya Nadejda Cherdyntseva 2013Gene2013,,:1
12Effect of co monomer composition on the controlled free radical copolymerization of styrene and malefic anhydride by reversible addition-fragmentation chain transfer (RAFT) 显示文摘Elena C Polina T Chuong B 2003Polymer2003,,44:1
13Ultrabright and Bioorthogonal Labeling of Cellular Targets Using Semiconducting Polymer Dots and Click Chemistry显示文摘ChangfengWu YuhuiJin ThomasSchneider Daniel R.Burnham Polina B.Smith Daniel T.Chiu 2010Angewandte Chemie International Edition2010,,49:1
14Electrical remodeling of cardiac myocytes from mice with heart failure due to the overexpression of tumor necrosis factor-α显示文摘Polina S Petkova K Erdal G 2006Am J Physiol Heart Circ Physiol2006,290,5:1
15Ketogenic diet versus ketoacidosis: what determines the influence of ketone bodies on neurons?显示文摘Glucose is the main energy substrate for neurons, however, at certain conditions, e.g. in starvation, these cells could also use ketone bodies. This approach is used in clinical conditions as the ketogenic diet. The ketogenic diet is actually a biochemical model of fasting. It includes replacing carbohydrates by fats in daily meal. Synthesis of ketone bodies β-hydroxubutirate, acetoacetate and acetone begins once glycogen stores have depleted in the liver. The ketogenic diet can be used to treat clinical conditions, primarily epilepsy. The mechanism of neuroprotective action of ketogenic diet is not very clear. It is shown that ketone bodies influence neurons at three different levels, namely, metabolic, signaling and epigenetic levels. Ketone bodies are not always neuroprotective. Sometimes they can be toxic for the brain. Ketoacidosis which is a very dangerous complication of diabetes mellitus or alcoholism can be taken as an example. The exact mechanism of how neuroprotective properties of ketone bodies reverse to neurotoxic is yet to be established.Sergei V.Fedorovich Polina P.Voronina Tatyana V.Waseem 2018Neural Regeneration Research2018,13,12:1
16Effect of comonomer composition on the controlled free-radical copolymerization of styrene and maleic anhydride by reversible addition-fragementation chain transfer ( RAFT) 显示文摘Elena C Polina T Chuong B 2003Polymer2003,,44:1
17Nanomaterials for heterogeneous combustion显示文摘Alla P Polina U Yurii F 2004Propellants Explosives Pyrotechnics2004,29,1:1
18Integrating 'Back to Sleep' recommendations into neonatal ICU practice显示文摘Polina Gelfer Ricci Cameron Kathy Masters Kathleen A Kennedy 2013Pediatrics2013,131,4:1
19Noninvasive treatment of focal ade- nomyosis with MR-gnided focused ultrasound in two patients显示文摘Polina L Nyapathy V Mishra A 2012Indian J Radiol Imaging2012,22,2:1
20A simple cuff electrode for nerve recording and stimulation in acute experiments on small animals 显示文摘 Fenik Polina Kubin Leszek 2001Journal of Neuroscience Methods2001,106,2:1
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