1,087 research outputs found
Response of Pedunculate Oak (Quercus robur L.) to Adverse Environmental Conditions in Genetic and Dendrochronological Studies
No full textPedunculate oak (Quercus robur L.) is widely distributed across Europe and serves critical ecological, economic, and recreational functions. Investigating its responses to stressors such as drought, extreme temperatures, pests, and pathogens provides valuable insights into its capacity to adapt to climate change. Genetic and dendrochronological studies offer complementary perspectives on this adaptability. Tree-ring analysis (dendrochronology) reveals how Q. robur has historically responded to environmental stressors, linking growth patterns to specific conditions such as drought or temperature extremes. By examining tree-ring width, density, and dynamics, researchers can identify periods of growth suppression or enhancement and predict forest responses to future climatic events. Genetic studies further complement this by uncovering adaptive genetic diversity and inheritance patterns. Identifying genetic markers associated with stress tolerance enables forest managers to prioritize the conservation of populations with higher adaptive potential. These insights can guide reforestation efforts and support the development of climate-resilient oak populations. By integrating genetic and dendrochronological data, researchers gain a holistic understanding of Q. robur’s mechanisms of resilience. This knowledge is vital for adaptive forest management and sustainable planning in the face of environmental challenges, ultimately helping to ensure the long-term viability of oak populations and their ecosystems. The topics covered in this review are very broad. We tried to include the most relevant, important, and significant studies, but focused mainly on the relatively recent Eastern European studies because they include the most of the species’ area. However, although more than 270 published works have been cited in this review, we have, of course, missed some published studies. We apologize in advance to authors of those relevant works that have not been cited
Sepsis: a historical metamorphosis of the concepts (to the 100th anniversary of the birth of the author of the first national monograph «septic shock» Professor M. I. Lytkin)
No full textThe article presents the features of the terminology of the main concepts on the problem, of sepsis from ancient times to the present. The contribution of Professor M. I. Lytkin to the development of the doctrine of surgical sepsis as the author of isolation and justification, of its independent form — angiogenic sepsis and the first national monograph “Septic shock" is shown. The special role in further improvement of definitions of the problem, of surgical sepsis in close integration, of clinicians, morphologists, microbiologists and researchers in the field of fundamental Sciences is emphasized
Phonespoof: a new dataset for spoofing attack detection in telephone channel
No full textThe results of spoofing detection systems proposed during ASVspoof Challenges 2015 and 2017 confirmed the perspective in detection of unforseen spoofing trials in microphone channel. However, telephone channel presents much more challenging conditions for spoofing detection, due to limited bandwidth, various coding standards and channel effects. Research on the topic has thus far only made use of program codecs and other telephone channel emulations. Such emulations does not quite match the real telephone spoofing attacks. In order to asses spoofing detection methods in real scenario we present the PHONESPOOF dataset - spoofing data collected through realistic telephone channels. The PHONE-SPOOF data collection represents most threatening types of spoofing attacks and is publicly available dataset1. This work2 aimed to investigate robustness of the state-of-the-art deep learning based antispoofing systems under telephone spoofing attacks conditions based on the PHONESPOOF data. Moreover newly collected dataset makes it possible to analize language dependency issue for the Anti-Spoofing methods. In the work we also focused on the development of a unified LCNN-based approach for spoofing attack detection. The goal was to train a single system able to detect various types of spoofing attacks in telephone channel. The obtained results approve the effectiveness of such solution
The meeting of a Russian with Europe in the travel writings of Peter the Great’s era (A. A. Matveev)
No full textThe paper revises the traditional view at the travel writings of the era of Peter the Great. They
are usually considered as naive works, and content of these works as identical to the biographies
of it’s authors. The method of historical and linguistic research of V. M. Zhivov on the
language of Russian writing is applied to the material of travelogues. The main purpose is to
account for the pragmatics of the utterance in travel literature as in a phenomenon synthesizing
heterogeneous features in principle and in the transitional Peter’s Era in particular. The
paper is focused on the notes of the diplomat A. A. Matveev, compiled by him for himself as
a result of his journey from the Hague to Paris (1705–1706). The narrative technique in Matveev’s
text is examined (descriptions of the monuments of the French capital and the inscriptions
to them in Latin), and it is shown that we should not reduce the function of Matveev’s
work to purely diplomatic tasks of his actual journey. The descriptions recorded in Matveev’s
text were politically charged: the author not only collected samples of inscriptions, but also
demonstrated a new way for Russia to glorify the reigning monarch. This peculiar collection
of Matveev is also considered in the context of cultural phenomena that were relevant at the
beginning of the 18th century: private and court collections of rarities, embossing of commemorative
medals, etc. The conclusion is made that borrowed elements change their function
in the travelogue. In the historical and literary perspective, we must bring such works as
Matveev’s notes out of the zone of marginal literary phenomena. In general, this allows us to
see the key trends of the transitional period of the history of Russian literature. It is more appropriate
to consider these processes not to state the Western European origin of individual
elements of culture, but to analyze their pragmatics associated with the demarcation from the
old Russian culture.The study was funded by the Russian Science Foundation, project no. 21-18-00527 in the Institute of
Russian Literature (Pushkin House) of the Russian Academy of Sciences, https://rscf.ru/project/21-18-00527/
Photophysics and photochemistry of diiodomethane and hexabromoiridate - paradigm molecules for organic and inorganic chemistry - studied with sub-50-fs broadband pump-probe spectroscopy
No full textTime-resolved relaxation dynamics of near-infrared excited electronic states in transition metal complexes
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Previous issue date: 6Sub-100 fs time-resolved, broadband transient absorption spectroscopy was employed to investigate ultrafast radiationless relaxation dynamics of near-infrared, metal-centered (MC), electronic excited states of several d5 and d9 transition metal complexes (e.g., CuCl4 2−, CuBr4 2−, IrBr6 2−, IrCl6 2−, etc.) in acetonitrile solution. The results yield insights into the topology of the involved potential energy surfaces, Jann-Teller distortions, and the dynamics through conical intersections connecting the first excited and ground electronic states (energy gap, less than 8000 cm−1 ). Furthermore, it was found that the addition of water to the solutions efficiently quenches the MC excited states via energy transfer
TIME-RESOLVED RELAXATION DYNAMICS OF NEAR-INFRARED EXCITED ELECTRONIC STATES IN TRANSITION METAL COMPLEXES.
No full textSub-100 fs time-resolved, broadband transient absorption spectroscopy was employed to investigate ultrafast radiationless relaxation dynamics of near-infrared, metal-centered (MC), electronic excited states of several d and d transition metal complexes (e.g., \chem{CuCl_4}, \chem{CuBr_4}, \chem{IrBr_6}, \chem{IrCl_6}, etc.) in acetonitrile solution. The results yield insights into the topology of the involved potential energy surfaces, Jann-Teller distortions, and the dynamics through conical intersections connecting the first excited and ground electronic states (energy gap, less than 8000 \wn). Furthermore, it was found that the addition of water to the solutions efficiently quenches the MC excited states via energy transfer
Theoretical kinetic study of the reactions between pyridyl radicals and O2
No full textReactions of the primary pyridine radicals, ortho-, meta-, and para-pyridyls with oxygen control the overall rate of pyridine oxidation. In the present work, the potential energy surfaces of o-, m-, and p-pyridyls + O2 previously developed by the authors have been employed for a systematic theoretical kinetic study of the rate constants of these reactions. The geometries of reactants, products, intermediates, and transition states of the reactions of pyridyl radicals with O2 were optimized at the level of density functional theory using the ωB97XD functional with the 6-311G** basis set. The temperature- and pressure-dependent rate constants of 31 reactions were evaluated within the framework of the Rice-Ramsperger-Kassel-Marcus (RRKM) theory combined with the Master Equation approach (RRKM–ME) in the temperature range from 300 to 3000 K, covering pressures from 0.01 to 100 atm. For several reactions previously investigated in the literature, good agreement was demonstrated, indicating consistency and correctness of the present theoretical calculations. Moreover, thermodynamic data for all important reactants, products, and intermediates have been revisited and calculated at the G4 theoretical level. The calculated rate constants and thermodynamic data provide a backbone for the development of detailed kinetic models for pyridine combustion
Measurement of the polarization amplitudes and triple product asymmetries in the B0s → Φ Φ decay
No full text<p>Using 1.0 fb−1 of pp collision data collected at a centre-of-mass energy of s√=7 TeV with the LHCb detector, measurements of the polarization amplitudes, strong phase difference and triple product asymmetries in the B0s→ϕϕ decay mode are presented. The measured values are</p>
<p>|A0|2=0.365±0.022(stat)±0.012(syst),|A⊥|2=0.291±0.024(stat)±0.010(syst),cos(δ∥)=−0.844±0.068(stat)±0.029(syst),AU=−0.055±0.036(stat)±0.018(syst),AV=0.010±0.036(stat)±0.018(syst).</p>
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