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Exploring van der Waals materials with high anisotropy:geometrical and optical approaches

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Light(Science & Applications) 2024年第4期13卷 645-653页

作者： Aleksandr S.Slavich Georgy A.Ermolaev Mikhail K.Tatmyshevskiy Adilet N.Toksumakov olga G.Matveeva Dmitriy V.Grudinin Kirill V.Voronin Arslan Mazitov Konstantin V.Kravtsov Alexander V.Syuy Dmitry M.Tsymbarenko Mikhail S.Mironov Sergey M.Novikov Ivan Kruglov Davit A.Ghazaryan Andrey A.Vyshnevyy Aleksey V.Arsenin Valentyn S.Volkov Kostya S.Novoselov Moscow Center for Advanced Studies Kulakova str.20Moscow 123592Russia. Emerging Technologies Research Center XPANCEOInternet CityEmmay TowerDubaiUnited Arab Emirates. Donostia International Physics Center(DIPC) Donostia/San-Sebastián 20018Spain. Institute of Materials Ecole Polytechnique Federale de Lausanne1015 LausanneSwitzerland. Department of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia. Laboratory of Advanced Functional Materials Yerevan State UniversityYerevan 0025Armenia. National Graphene Institute(NGI) University of ManchesterManchester M139PLUK. Department of Materials Science and Engineering National University of SingaporeSingapore 03-09 EASingapore. Institute for Functional Intelligent Materials National University of Singapore117544 SingaporeSingapore

The emergence of van der Waals(vdW)materials resulted in the discovery of their high optical,mechanical,and electronic anisotropic properties,immediately enabling countless novel phenomena and *** success inspired an intensive search for the highest possible anisotropic properties among vdW ***,the identification of the most promising among the huge family of vdW materials is a challenging quest requiring innovative ***,we suggest an easy-to-use method for such a survey based on the crystallographic geometrical perspective of vdW materials followed by their optical *** our approach,we found As2S3 as a highly anisotropic vdW *** demonstrates high in-plane optical anisotropy that is~20%larger than for rutile and over two times as large as calcite,high refractive index,and transparency in the visible range,overcoming the century-long record set by *** these benefits,As2S3 opens a pathway towards nextgeneration nanophotonics as demonstrated by an ultrathin true zero-order quarter-wave plate that combines classical and the Fabry–Pérot optical phase ***,our approach provides an effective and easy-to-use method to find vdW materials with the utmost anisotropic properties.

关键词： anisotropy anisotropic high

Cytotoxic Properties on Cervical and Liver Cancer Cells of Two Plant Recipes from Burkina Faso

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Journal of Biosciences and Medicines 2024年第6期12卷 216-229页

作者： Estelle Ouédraogo Bagora Bayala Théodora Mahoukèdè Zohoncon Samiratou Ouédraogo olga Mélanie Lompo Essi Etonam Dovo Jean-Marie Compaoré Albert Théophane Yonli Jacques Simpore Laboratory of Molecular Biology and Genetics (LABIOGENE) Joseph KI-ZERBO University Ouagadougou Burkina Faso Center of Biomolecular Research Pietro Annigoni (CERBA) Ouagadougou Burkina Faso Ecole Normale Suprieure Koudougou Burkina Faso Hspital Saint Camille of Ouagadougou (HOSCO) Ouagadougou Burkina Faso Faculty of Health University Saint Thomas dAquin (USTA) Ouagadougou Burkina Faso Chair Research and Action against Cancer Department of Public Health Training and Research Unit in Health Sciences Joseph KI-ZERBO University Ouagadougou Burkina Faso National Population Health Observatory National Institute of Public Health Ouagadougou Burkina Faso The Department of Epidemiology Biostatistics and Occupational Health School of Population and Global Health Montral Canada Laboratory of Pathological Anatomy and Cytology University Joseph KI-ZERBO Ouagadougou Burkina Faso TIIG LA TIIM Ouagadougou Burkina Faso

Cancer is one of the deadliest diseases in developing countries. In recent years, natural plant-based compounds have been used in the search for drugs to combat numerous diseases, including cancer. In this study, we evaluate the cytotoxic properties of paanfo tiben 1 and paanfo tiben 2, two traditional herbal formulations from Burkina Faso used in the treatment of cancer in Burkina Faso. To this end, the recipes were infused and freeze-dried. The dry extracts obtained were used to determine total phenolics and flavonoids content, assess antioxidant activity using the DPPH, ABTS and FRAP methods, evaluate anti-inflammatory properties by inhibiting 15-LOX, COX 1 and 2, and assess cytotoxic activity on HeLa cervical cancer and HePG2 liver cancer cell lines using the MTT test. The paanfo tiben 1 recipe showed the highest levels of total phenolics and flavonoids, as well as the best antioxidant activities, with IC50 values of 21.020 ± 0.6 µg/ml and 22.94 ± 0.57 µg/ml for DPPH and ABTS, and 165.15 mM EAA/mg dry extract for FRAP. It also exhibited the best cytotoxic activity with IC50 values of 112.02 ± 0.025 µg/ml on HeLa cells and 80.67 ± 6.08 µg/ml on HepG2 cells. On the other hand, paanfo tiben 2 exhibited the best anti-inflammatory activities through inhibition of 15-LOX and COX 1, with inhibition percentages at 100 µg/ml of 32.523% and 24.717 % respectively. These results could justify the traditional use of these two recipes by traditional health practitioners in the treatment of cancer sufferers in Burkina Faso.

关键词： Antioxidant Anti-Inflammatory Cytotoxicity Paanfo Tiben Burkina

Deciphering tau-related dementia using human iPSC lines: electrophysiological perspectives of future studies

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Neural Regeneration Research 2022年第12期17卷 2672-2674页

作者： olga Kopach Queen Square Institute of Neurology University College LondonLondonUK

To date,no disease-modifying treatment or cure is available for *** disorder is becoming more common as the global population *** has been over several decades of extensive research focusing on how the pathology develops and progresses causing memory loss,brain damage,and eventually death-it provides the field with a deep understanding of what proteins,peptides,and signaling molecules contribute to neurodegeneration at the molecular,genetic,and cellular *** problem is,however,that there is a wide range of dementia types.A given disease can span heterogeneous clinical syndromes with diverse symptomatology,no matter whether it is“senile dementia”or an early-onset form;moreover,it encompasses the mixed features of many syndromes in later stages of the disease.

关键词： senile pathology eventually

U-Blacks Mineralization in Sandstone Uranium Deposits

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Journal of Earth Science 2022年第2期33卷 308-316页

作者： olga A.Doynikova Institute of Ore Deposits Geology PetrographyMineralogy and Geochemistry Russian Academy of ScienceMoscow 119017Russia

Ores of infiltration sandstone-hosted uranium deposits in the sedimentary cover are ubiquitous composed of dispersed soot powder mineralization of black,brownish-black *** studies of such loose U-ores by analytical transmission electron microscopy(ATEM)proved their polymineral *** blacks are composed by at least three different U-mineral forms:oxide(uraninite),silicate(coffinite)and phosphate(ningyoite)which are present in various proportions of ore *** high dispersed friable uranium formations are difficult to diagnose by traditional mineralogical methods(optical,XRD,IR and X-ray spectroscopy,etc.)which analyze total sample composition(phases mixture);their results characterize the dominant sample phase,omitting both sharply subordinate and X-ray amorphous *** research results are based on ATEM methods(SAED+EDS),which are optimal for crystallochemical diagnostics in the mineralogical study of such uranium *** article presents the diagnostic characteristics under electron microscope(EM)of uranous minerals from different sandstone deposits with their origin being discussed.

关键词： uranous minerals uraninite coffinite ningyoite biogenic nature U-deposit ore deposit geology

Olfactory dysfunction as a common biomarker for neurodegenerative and neuropsychiatric disorders

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Neural Regeneration Research 2023年第5期18卷 1029-1030页

作者： David Slabik olga Garaschuk Department of Psychiatry and Psychotherapy Tübingen Center for Mental HealthEberhard Karls University of TübingenTübingenGermany Institute of Physiology Department NeurophysiologyEberhard Karls University of TübingenTübingenGermany

The sense of smell supports the identification and the safety of food,warns of danger/predators,and plays a key role in mating(Croy and Hummel,2017;Kondo et al.,2020;Tzeng et al.,2021).Via connection to the limbic system,it supports behavioral adaption and emotions and can detect fear,tears,and happiness in the body odor of others(Croy and Hummel,2017;Tzeng et al.,2021).

关键词： Kondo tears al.

样本不均衡情况下的航空发动机轴承故障诊断方法

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郑州航空工业管理学院学报 2024年第4期42卷 5-11页

作者：王海泉王亚辉杨岳毅 Kurkova olga Petrovna 温盛军陈乐瑞路成钢中原工学院中原彼得堡航空学院(智能感知与仪器学院) 河南郑州450007 中原工学院自动化与电气工程学院河南郑州450007 俄罗斯圣彼得堡国立宇航与仪器制造大学电子与激光仪器系圣彼得堡14-51

航空发动机滚动轴承工作在高温、高压、高转速的恶劣环境下,故障率高,因此对于其故障的准确识别和判断尤为重要。但由于轴承故障的偶发性,各类故障样本不均衡的问题非常突出,大大影响了基于数据的模式识别方法的准确性。本文提出了一种... 详细信息

航空发动机滚动轴承工作在高温、高压、高转速的恶劣环境下,故障率高,因此对于其故障的准确识别和判断尤为重要。但由于轴承故障的偶发性,各类故障样本不均衡的问题非常突出,大大影响了基于数据的模式识别方法的准确性。本文提出了一种样本不均衡条件下的航空发动机滚动轴承智能诊断方法,采用合成少数类过采样方法进行样本平衡,在完成时频域特征提取和特征选择之后,利用改进蜂群算法优化后的随机森林策略实现轴承故障分类,并在凯斯西储大学轴承数据集和实验室构建的模拟航空发动机滚动轴承数据集上进行了实验验证。结果显示在凯斯西储大学中度不均衡数据集下,故障识别的准确率为98.30%,在重度不均衡数据集下的分类结果为96.30%。在实验室构建的模拟航空发动机滚动轴承实验台上,不均衡数据集的分类结果为97.65%,重度不均衡数据集的分类准确率为95.67%。相关实验证明本文所提算法能够有效完成不均衡样本下的航空发动机滚动轴承故障诊断任务。

关键词：航空发动机轴承故障诊断数据不平衡过采样蜂群算法

Role of serotonin in modulating the development and function of adult-born neurons in the olfactory bulb

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Neural Regeneration Research 2022年第6期17卷 1253-1254页

作者： Natalie Fomin-Thunemann olga Garaschuk Department of Biomedical Engineering Boston UniversityBostonMAUSA Institute of Physiology Department NeurophysiologyEberhard Karls University of TübingenTübingenGermany

The neuromodulatory transmitter serotonin(5-hydroxytryptamine,5-HT)is synthesized by neurons located in the brainstem,which project more or less densely to the entire central nervous system(Charnay and Leger,2010).Serotonin regulates a variety of physiological functions,including food intake,reward,reproduction,sleep-wake cycle,memory,cognition,emotion,and mood(Charnay and Leger,2010).

关键词： serotonin intake modulator

Comparison Analysis of Longitudinal Electrical Conductivity Distribution and Seismic Tomography Velocity Models for the Central Tien Shan Region

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Journal of Earth Science 2023年第2期34卷 580-587页

作者： olga Zabinyakova Elena Bataleva Irina Medved Research Station of the Russian Academy of Sciences in Bishkek City Bishkek 720049Kyrgyzstan Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of SciencesNovosibirsk 630090Russia Trofimuk Institute of Petroleum Geology and Geophysics Siberian Branch of the Russian Academy of SciencesNovosibirsk 630090Russia

The paper is dedicated to consider the approach of longitudinal electrical conductivity maps construction for Central Tien Shan region and to complete the comparison analysis of these maps with related seismic tomography *** results of joint analysis of longitudinal electrical conductivity distribution and seismic tomography velocity models with respect to geological and geophysical senses allow to confirm the already known and to establish the new patterns of structure and geodynamics of the Tien Shan segment of Central Asia such as the manifestation of characteristic structural ensembles,reflection of the longitudinal and transverse segmentation of the Tien Shan,the existence within the framework of a“single”orogen of segments with different near-surface and deep structure and morphological *** well,the correlation between the velocity characteristics and geoelectric properties was *** correlation allows to identify signs of reflection of fault structures in geophysical fields and to clarify the territorial and structural position of both visible and hidden ***,in the paper,the geological interpretation of geophysical anomalies is considered.

关键词： profile magnetotelluric soundings longitudinal electrical conductivity map seismic tomography velocity model Tien Shan geophysics

Territorial Resilience Through Visibility Analysis for Immediate Detection of Wildfires Integrating Fire Susceptibility,Geographical Features,and Optimization Methods

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International Journal of Disaster Risk Science 2022年第4期13卷 621-635页

作者： Stavros Sakellariou George Sfoungaris olga Christopoulou Department of Agriculture Crop Production and Rural Environment University of Thessaly38446 VólosGreece Department of Planning and Regional Development University of Thessaly38334 VólosGreece Computer Science Department University of Crete70013 HeraklionCreteGreece

Climate change effects tend to reinforce the frequency and severity of wildfires worldwide,and early detection of wildfire events is considered of crucial *** primary aim of this study was the spatial optimization of fire resources(that is,watchtowers)considering the interplay of geographical features(that is,simulated burn probability to delimit fire vulnerability;topography effects;and accessibility to candidate watchtower locations)and geo-optimization techniques(exact programming methods)to find both an effective and financially feasible solution in terms of visibility coverage in Chalkidiki Prefecture of northern *** integration of all geographical features through the Analytical Hierarchy Process indicated the most appropriate territory for the installment of *** analysis guaranteed the independence and proximity of location options(applying spatial systematic sampling to avoid first order redundancy)across the *** conjunction of the above processes yielded 654 candidate watchtower positions in 151,890 ha of *** algorithm was designed to maximize the joint visible area and simultaneously minimize the number of candidate locations and overlapping effects(avoiding second order redundancy).The results indicate four differentiated location options in the study area:(1)75locations can cover 90%of the forests(maximum visible area);(2)47 locations can cover 85%of the forests;(3)31locations can cover 80.2%of the forests;and(4)16 locations can cover 70.6%of the *** last option is an e fficient solution because it covers about 71%of the forests with just half the number of watchtowers that would be required for the third option with only about 10%additional forest ***,the final choice of any location scheme is subject to agency priorities and their respective financial flexibility.

关键词： Burn probability Greece Spatial optimization Topography effects Viewshed coverage Watchtowers Wildfire detection