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exploring the electromagnetic shielding behavior of lanthanum doped calcium nanoferrites

Journal of Rare earths 2024年第11期42卷 2128-2136页

作者： e.Ahilandeswari K.Sakthipandi R.Rajesh Kanna G.Rajkumar B.Ganesh Babu S.Arunmetha Aslam Hossain P.Sakthivel v.Rajendran M.Srinidhi Raghavan Department of Physics SRM TRP Engineering College Department of electronics and Communication engineering M. Kumarasamy College of Engineering Department of Physics Easwari Engineering College Department of Mechanical engineering SRM TRP Engineering College Centre for Advanced energy Studies Department of Electronics and Communication EngineeringKoneru Lakshmaiah Education Foundation Smart Materials Research Institute Southern Federal University Centre for Materials Science Department of PhysicsScience and HumanitiesFaculty of EngineeringKarpagam Academy of Higher Education Centre for Nanotechnology Academy of Maritime Education and Training (Deemed to be University) Department of Chemistry and Centre for Nano-Materials and Displays B.M.S. College of Engineering

The present study focuses on the synthesis and characterization of lanthanum(La3+)-doped calcium nanoferrites(CaLaxFe2-xO4:x=0.025,0.050,0.075 and 0.100) using the sonochemical *** techniques were employed to analyze the effect of La3+infusion,Raman spectroscopy confirms the presence of active A1g,T2gand egmodes in the CaLaxFe2-xO4nanoferrite,indicating the formation of an active ferrite *** introduction of La3+doping results in a significant increase in the band gap energy,rendering the nanoferrites insulating（3.23-3,57 ev）.At higher frequencies,the impedance studies reveal minimal losses and better AC conductivity,pointing to improved dielectric *** higher frequencies,the Q-factor of La-doped calcium nanoferrites shows lower electromagnetic *** M-H curve exhibits ferromagnetic behavior,with La3+-doped calcium nano ferrites displaying a saturation magnetization ranging from 12.72 to 18.10 emu/*** incorporation of La3+also induces enhanced electrical polarization,leading to notable dielectric loss and increased absorption of electromagnetic ***,these CaLaxFe2-xO4nanoferrites demonstrate potential as effective microwave absorbers across a wide frequency range,with significant shielding absorption observed at 8.8-9.1 GHz.

关键词： Dielectric Magnetism Microwave absorption Nanoferrites Rare earths Structural properties

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Luminescent Composite Films Based on Mechanically Strong Ladder-like Polyphenylsilsesquioxane and Oligophenyleuropiumsiloxane

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Chinese Journal of Polymer Science 2024年第11期 1793-1801页

作者： e.e.Kim T.O.ershova A.S.Belova D.A.Khanin e.v.Bashkova G.G.Nikiforova Yu.N.Kononevich A.A.Anisimov O.I.Shchegolikhina A.M.Muzafarov A.N.Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences Tula State Lev Tolstoy Pedagogical University v.Topchiev Institute of Petrochemical Synthesis Russian Academy of Sciences Moscow Institute of Physics and Technology (National Research University) N.S.enikolopov Institute of Synthetic Polymeric Materials Russian Academy of Sciences

Nowadays organosilicon luminescent materials are of increasing interest due to the variety of their synthetic or modification techniques and application fields. Ladder polyphenylsilsesquioxanes(L-PPSQ) are a unique class of organosilicon polymers, which can be ideal matrices for the luminescent composites due to their high thermal stability, optical transparency and mechanical strength. In this work, new mechanically strong, heat-resistant, transparent and sensitive to ammonia vapor luminescent composite films based on L-PPSQ have been obtained. As the source of europium ions oligophenyleuropiumsiloxane was used, demonstrating perfect compatibility to the matrix due to the similar *** improve luminescent properties of the films, new organosilicon ligands were introduced into the composites and their influence on the properties of the materials was studied. valuable properties of described composites may allow their further application as multifunctional coatings.

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Individual alcohol consumption by the population of Russia versus regional living conditions

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Global Health Journal 2024年第1期8卷 24-31页

作者： Sergey A.Maksimov Svetlana A.Shalnova Galina A.Muromtseva Yuliya A.Balanova Svetlana e.evstifeeva Anna v.Kapustina Oksana M.Drapkina National Medical Research Center for Therapy and Preventive Medicine Moscow 101990Russia

Background:There are substantial regional differences in drinking alcohol in Russia,both at the population and individual ***,the causes of these differences have not been studied ***:The goal of our study was to examine the effect of regional living conditions on individual alcohol consumption by the population of ***:For the analysis,we used data from a cross-sectional epidemiological study conducted in *** final analytical sample included 18,130 people aged 25-64 *** conducted the interviews face to face,based on which any drinking in the last year,as well as alcohol abuse,were considered as a *** abuse was recorded when the respondent consumed 5.75 or more grams of pure ethanol per day(75th percentile of average daily alcohol consumption among alcohol drinkers).The assessment of the regional living conditions was accomplished via integral indexing,which was previously performed based on publicly available data for *** were assessed using generalized scoring equations with unchanging standard *** associations were expressed by odds ratios(OR)and 95%confidence intervals(C).Results:Deterioration of social conditions and increase in demographic depression in the region of residence increased the odds of any drinking(OR 1.51,95%CI:1.33 to 1.72,Pespectively).The odds of alcohol abuse increased with the deterioration of social living conditions and the growth of the industrial development in the region:OR 1.35,95%CI:1.14 to 1.59,Ped assessing the impact of the regional living conditions on individual drinking alcohol in the population of Russia.

关键词： Alcohol Living environment Regional features Russia

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Biological,pathological,and multifaceted therapeutic functions of exosomes to target cancer

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Oncology Research 2024年第1期32卷 73-94页

作者： vIGNeSH BALAJI e DIvYA RAMeSH MANISHA CHUNGAN SHAJU AKSHARA KUMAR SAMYAK PANDeY RAKSHA NAYAK v.ALKA SRISHTI MUNJAL AMIR SALIMI K.SReeDHARA RANGANATH PAI SHANKAR M.BAKKANNAvAR Department of Pharmacology Manipal College of Pharmaceutical SciencesManipal Academy of Higher EducationManipalKarnataka576104India Department of Forensic Medicine and Toxicology Kasturba Medical CollegeManipal Academy of Higher EducationManipalKarnataka576104India School of Health and Community Services Durham CollegeOshawaOntarioL1G2G5Canada Department of Pharmaceutical Regulatory Affairs and Management Manipal College of Pharmaceutical SciencesManipal Academy of Higher EducationManipalKarnataka576104India Department of Clinical Psychology Manipal College of Health ProfessionsManipal Academy of Higher EducationManipalKarnataka576104India Department of Speech and Hearing Manipal College of Health ProfessionsManipal Academy of Higher EducationManipalKarnataka576104India Department of Pharmacy Practice Manipal College of Pharmaceutical SciencesManipal Academy of Higher EducationManipalKarnataka576104India

exosomes,small tiny vesicle contains a large number of intracellular particles that employ to cause various diseases and prevent several pathological events as well in the human *** is considered a“double-edged sword”,and depending on its biological source,the action of exosomes varies under physiological ***,the isolation and characterization of the exosomes should be performed accurately and the methodology also will vary depending on the exosome ***,the uptake of exosomes from the recipients’cells is a vital and initial step for all the physiological *** are different mechanisms present in the exosomes’cellular uptake to deliver their cargo to acceptor *** the exosomal uptake takes place,it releases the intracellular particles that leads to activate the physiological *** though exosomes have lavish functions,there are some challenges associated with every step of their preparation to bring potential therapeutic ***,overcoming the pitfalls would give a desired quantity of exosomes with high purity.

关键词： exosomes Physiology Cancer Therapeutics Challenges

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Non-canonical BRAF variants and rearrangements in hairy cell leukemia

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Oncology Research 2024年第9期32卷 1423-1427页

作者： STePHeN e.LANGABeeR Cancer Molecular Diagnostics St.James’s HospitalDublinD08 W9RTIreland

Hairy cell leukemia(HCL)is an uncommon mature B-cell malignancy characterized by a typical morphology,immunophenotype,and clinical *** vast majority of HCL patients harbor the canonical BRAF v600e mutation which has become a rationalized target of the subsequently deregulated RAS-RAF-MeK-MAPK signaling pathway in HCL patients who have relapsed or who are refractory to front-line ***,several HCL patients with a classical phenotype display non-canonical BRAF mutations or *** include sequence variants within alternative exons and an oncogenic fusion with the IGH *** must be taken in the molecular diagnostic work-up of patients with typical HCL but without the BRAF v600e to include investigation of these uncommon ***,functional characterization,and reporting of further such patients is likely to provide insights into the pathogenesis of HCL and enable rational selection of targeted inhibitors in such patients if required.

关键词： Hairy cell leukemia BRAF Molecular diagnostics Targeted therapy

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Structure and dielectric properties of (1-x)Na_(0.5)Bi_(0.5)TiO_(3-x)Na_(0.5)K_(0.5)NbO_(3)

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Journal of Advanced Dielectrics 2024年第1期14卷 82-88页

作者： e.v.Glazunova L.A.Shilkina A.S.Chekhova A.v.Nazarenko I.A.verbenko L.A.Reznichenko Research Institute of Physics Southern Federal University Rostov-on-Don344090Russia Faculty of Physics Southern Federal University Rostov-on-Don344090Russia Southern Scientific Center of the Russian Academy of Sciences Rostov-on-Don 344006Russia

The solid solutions of the(1-x)Na_(0.5)Bi_(0.5)TiO_(3-x)Na_(0.5)K_(0.5)NbO_(3) system were produced by the conventional ceramic technology using mechanical activation of the synthesized *** was found that in the(1-x)Na_(0.5)Bi_(0.5)TiO_(3-x)Na_(0.5)K_(0.5)NbO_(3) system at room temperature,a number of morphotropic phase transitions occur:rhombohedral!cubic!tetragonal!monoclinic *** introduction of a small amount of Na_(0.5)K_(0.5)NbO_(3) leads to an increase in the temperature stability of the dielectric properties of ceramics.A change in the relaxor properties of the solid solutions of the(1-x)Na_(0.5)Bi_(0.5)TiO_(3-x)Na_(0.5)K_(0.5)NbO_(3) system was *** increase in energy density and energy efficiency was found at additive 10 mol.%of Na_(0.5)K_(0.5)NbO_(3).

关键词： Ceramics lead-free materials mechanical activation dielectric properties energy storage

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3,6-Bis-β-Dicarbonylsubstituted Carbazoles Bearing N-Spacers and Their eu(III) Complexes as Immunofluorescent Labelling Agents

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International Journal of Organic Chemistry 2024年第1期14卷 20-31页

作者： Dmitry e. Pugachev Georgy v. Zatonsky Tatyana S. Kostryukova Anna G. Shubina Nikolay v. vasiliev Department of Biological Microanalysis FGUP State Research Institute of Biological Engineering Moscow Russia Department of Theoretical and Applied Chemistry State University of Education Mytishchi Russia

New reagents for immunofluorescence analysis of carbazole series containing fluorinated β-dicarbonyl fragments and carboxylic substituent groups separated by spacers of different lengths from the light-gathering carbazole scaffold have been developed. The markers in complex with eu3+ ions possess stability in the aqueous phase, intense and prolonged luminescence (τ 550 - 570 μs) with characteristic emission maxima in the region of 615 nm and excitation wavelengths in the region of 380 - 390 nm, which distinguishes them from most of the analogs used. In the study of marker conjugation with streptavidin, a reagent containing 4 - 5 europium labeling complexes based on spacer-containing carbazole tetraketone was obtained. The marker-doped silicate nanoparticles exhibit intense and long-lived luminescence in the characteristic region.

关键词： Fluorescence Immunoassay Fluorinated β-Diketones Carbazole europium Complexes Streptavidin Nanodispersions

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Formadinium Cation Doping Stabilized Ultra-deep-blue Lead Halide Perovskite Nanocrystal Light-emitting Diodes

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Chemical Research in Chinese Universities 2024年第3期40卷 556-560页

作者： Pui Kei KO Jonathan e.HALPeRT Department of Chemistry The Hong Kong University of Science and TechnologyKowloonHong Kong 999077P.R.China

The halide migration effect in mixed-halide lead-based perovskite is a serious problem hindering the development of its display *** this study,we have successfully addressed this issue by reporting formadinium(FA)doped mixed-halide perovskite nanocrystals(NCs)with ultra-deep-blue emission of 450 nm,narrow bandwidth of 16 nm,and a high photoluminescence quantum yield(PLQY)of 66%.The perovskite nanocrystal light-emitting diodes(NC-LeDs)using this nanocrystal as an active layer achieved a maximum external quantum efficiency(eQe)of 0.32%,30-fold improved compared to that of pristine and stable electroluminescence(eL)spectra at 450 nm under a 4.9–8.0 v *** findings demonstrate the potential of our approach in developing stable and efficient deep blue perovskite NC-LeDs.

关键词： Halide perovskite Light-emitting diode Deep-blue

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Accounting for Quadratic and Cubic Invariants in Continuum Mechanics–An Overview

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Fluid Dynamics & Materials Processing 2024年第9期20卷 1925-1939页

作者： Artur v.Dmitrenko vladislav M.Ovsyannikov Department of Physics National Research Nuclear University(MEPhI)Kashirskoye Shosse 31Moscow115409Russian Federation Department of Thermal engineering and Department of Waterways Ports and Hydraulic StructuresRussian University of Transport(MIIT)Obraztsova Street 9Moscow127994Russian Federation

The differential equations of continuum mechanics are the basis of an uncountable variety of phenomena and technological processes in fluid-dynamics and related *** equations contain derivatives of the first order with respect to *** derivation of the equations of continuum mechanics uses the limit transitions of the tendency of the volume increment and the time increment to *** are used to derive the wave *** differential wave equation is second order in ***,increments of volume and increments of time in continuum mechanics should be considered as small but finite quantities for problems of wave *** is important for calculating the generation of sound waves and water hammer ***,the euler continuity equation with finite time increments is of *** finiteness of the time increment makes it possible to take into account the quadratic and cubic invariants of the strain rate *** is a new branch in *** and cubic invariants will be used in differential wave equations of the second and third order in time.

关键词： Quadratic invariant cubic invariant continuity equation generation of periodic waves N.e.Zhukovsky’s hydraulic shock turbulence

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Myelin histology:a key tool in nervous system research

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Neural Regeneration Research 2024年第2期19卷 277-281页

作者： Óscar Darío García-García víctor Carriel Jesús Chato-Astrain Department of Histology Tissue Engineering GroupUniversity of Granada&Instituto de Investigación Biosanitaria ibs.GRANADAGranadaSpain

The myelin sheath is a lipoprotein-rich,multilayered structure capable of increasing conduction velocity in central and peripheral myelinated nerve *** to the complex structure and composition of myelin,various histological techniques have been developed over the centuries to evaluate myelin under normal,pathological or experimental ***,methods to assess myelin integrity or content are key tools in both clinical diagnosis and neuroscience *** this review,we provide an updated summary of the composition and structure of the myelin sheath and discuss some histological procedures,from tissue fixation and processing techniques to the most used and practical myelin histological staining *** the lipoprotein nature of myelin,the main features and technical details of the different available methods that can be used to evaluate the lipid or protein components of myelin are described,as well as the precise ultrastructural techniques.

关键词： fluorescence microscopy histology light microscopy lipid histochemistry metallographic techniques myelin histochemistry myelin immunohistochemistry myelin structure&composition myelin ultrastructural evaluation tissue fixation&processing

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