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The investigation of fly ash based asphalt binders using atomic force microscope

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Frontiers of Earth Science 2017年第4期11卷 380-387页

作者： Rajan SAHA Kyle MALLOY Emil BAUTISTA konstantin sobolev Department of Civil and Environmental Engineering University of Wisconsin at Milwaukee WI 53705 USA

Atomic Force Microscope （AFM） is a relatively new technique for investigation of construction materials. In this study AFM was used to investigate the interaction of asphalt binder with fly ash. Fly ash is a coal combustion byproduct of electric power utilities having pozzolanic properties and commonly used in Portland cement concrete. In this study, an investigation was made by using different types of fly ash with two types of asphalt binders such as PG 58-28 and PG 64-28. Asphalt microstructure is divided into four subgroups such as Saturates, Aromatics, Resins and Asphaltenes （SARA）. These four phases can be distinguished by the atomic force microscope. The interaction of these phases affected by introducing fly-ash was investigated and correlation with rheological properties was observed.

关键词： AFM fly ash bee rheology asphalt

Actuality and underlying mechanisms of systemic immuneinflammation index and geriatric nutritional risk index prognostic value in hepatocellular carcinoma

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World Journal of Gastrointestinal Surgery 2024年第2期16卷 260-265页

作者： konstantin Y Tchilikidi Department of Surgery with Postgraduate Education Altai State Medical UniversityBarnaul 656031Russia

This editorial contains comments on the article“Correlation between preoperative systemic immune inflammation index,nutritional risk index,and prognosis of radical resection of liver cancer”in a recent issue of the World Journal of Gastrointestinal *** pointed out the actuality and importance of the article and focused primarily on the underlying mechanisms making the systemic immuneinflammation index(SII)and geriatric nutritional risk index(GNRI)prediction features *** are few publications on both SII and GNRI together in hepatocellular carcinoma(HCC)and patient prognosis after radical *** release cytokines,chemokines,and enzymes,degrade extracellular matrix,reduce cell adhesion,and create conditions for tumor cell *** promote the adhesion of tumor cells to endothelial cells,through physical *** results in the migration of tumor ***-angiogenic factors from platelets enhance tumor angiogenesis to meet tumor cell supply *** can form a protective film on the surface of tumor *** allows avoiding blood flow damage as well as immune system *** also induces the epithelial-mesenchymal transformation of tumor cells that is critical for *** SII is also associated with macro-and microvascular invasion and increased numbers of circulating tumor cells.A high GNRI was associated with significantly better progression-free and overall *** patients are a very special population that requires increased *** and GNRI have significant survival prediction value in both palliative treatment and radical surgery *** underlying mechanisms of their possible predictive properties lie in the field of essential cancer *** features provide tumor nutrition,growth,and distribution throughout the body,such as vascular *** the other hand,they are tied to the possibility of patients to resist tumor progression and development of complications in bot

关键词： Systemic immune-inflammation index Geriatric nutritional risk index Radical surgery Transarterial chemoembolization Hepatocellular carcinoma Prognosis

Ex vivo liver resection and auto-transplantation and special systemic therapy in perihilar cholangiocarcinoma treatment

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World Journal of Gastrointestinal Surgery 2024年第3期16卷 635-640页

作者： konstantin Y Tchilikidi Department of Surgery with Postgraduate Education Altai State Medical UniversityBarnaul 656031Russia

This editorial contains comments on the article“Systematic sequential therapy for ex vivo liver resection and autotransplantation:A case report and review of li-terature”in the recent issue of World Journal of Gastrointestinal *** points out the actuality and importance of the article and focuses primarily on the role and place of ex vivo liver resection and autotransplantation(ELRAT)and systemic therapy,underlying molecular mechanisms for targeted therapy in perihilar cho-langiocarcinoma(pCCA)*** is a tough malignancy with a high proportion of advanced disease at the time of *** only curative option is radical *** excision and reconstruction become extremely com-plicated and not always could be performed even in localized *** the other hand,ELRAT takes its place among surgical options for carefully selected pCCA *** advanced disease,systemic therapy becomes a viable option to prolong *** editorial describes current possibilities in chemotherapy and reveals underlying mechanisms and projections in targeted therapy with ki-nase inhibitors and immunotherapy in both palliative and adjuvant ***-broblast grow factor and fibroblast grow factor receptor,human epidermal grow-th factor receptor 2,isocitrate dehydrogenase,and protein kinase cAMP activated catalytic subunit alpha(PRKACA)and beta(PRKACB)pathways have been ac-tively investigated in CCA in last *** agents were introduced and approved by the Food and Drug *** all demonstrated mean-ingful activity in CCA patients with no global change in *** is why every successfully treated patient counts,especially those with advanced *** conclusion,pCCA is still hard to treat due to late diagnosis and extremely complicated surgical *** also brings some hope,but it could be performed in very carefully selected *** disease requires systemic anticancer treatment,which is supposed to be indivi

关键词： Perihilar cholangiocarcinoma Klatskin’tumor Ex vivo liver resection and autotransplantation Chemotherapy Immunotherapy Targeted therapy

Exploiting the unique interaction characteristics of fast neutrons for improved cancer therapy:A radiobiological perspective

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Radiation Medicine and Protection 2024年第1期5卷 24-29页

作者： Festo Kiragga konstantin Brazovskiy Tomsk Polytechnic University School of Nuclear Power and Electrical Engineering30Lenina AvenueTomsk 634050Russian Federation

Fast neutrons have sufficient energy to liberate recoil protons,alpha particles,and other products when they interact with the nuclei of the target material through scattering and absorption *** interactions with biological tissues occur mainly with hydrogen nuclei and as the protons interact with the hydrogen in tissues,they create dense ionization chains along their tracks thus depositing *** neutron therapy was pioneered by Robert Stone in 1938 a few years after the discovery of the *** main advantage is the limited sensitivity to hypoxia and treatment of slow-growing tumors hence better local *** is where photon therapy has yet to have much *** deposition by fast neutrons in living tissues is higher than in conventional radiotherapy using mega voltage(MV)photon *** higher energy deposition gives fast neutrons a higher relative biological effectiveness(RBE)in dealing with certain *** neutrons also have a higher linear energy transfer(LET)and can reach deep-sited tumors better than photon *** main challenge with Fast neutron therapy has been extreme toxicity in late-reacting ***,fast neutron therapy holds potential for the treatment of certain tumors by leveraging the unique interaction characteristics of fast neutrons with biological *** review therefore intends to bring this uniqueness to light to enhance the understanding of the radiobiological properties of fast neutrons and the advantages associated with its therapy.

关键词： Neutrons Radiation therapy Energy Double-strand break(DSB)

Consideration of the influence of supports in modeling the electromagnetic fields of 25 kV traction networks under emergency conditions

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Global Energy Interconnection 2024年第4期7卷 528-540页

作者： konstantin Suslov Andrey Kryukov Ekaterina Voronina Pavel Ilyushin Department of Hydropower and Renewable Energy National Research UniversityMoscow Power Engineering InstituteMoscow 11250Russia Department of Power Supply and Electrical Engineering Irkutsk National Research Technical UniversityIrkutsk 664074Russia Department of Transport Electric Power Irkutsk State Transport UniversityIrkutsk 664074Russia Department of Research on the Relationship between Energy and the Economy Energy Research Institute of the Russian Academy of SciencesMoscow 117186Russia

Single-phase 25 kV traction networks of electrified alternating current(AC)railways create electromagnetic fields(EMFs)with significant levels of *** most intense magnetic fields occur when short circuits exist between the contact wire and rails or *** the short duration of exposure,they can adversely affect electronic devices and induce significant voltages in adjacent power lines,which is dangerous for operating *** numerous investigations have focused on modeling the EMF of traction networks and power lines,the challenge of determining the three-dimensional electromagnetic fields near metal supports during the flow of a short-circuit current through them is yet to be *** this case,the field has a complex spatial structure that significantly complicates the calculations of *** study proposes a methodology,algorithms,software,and digital models for determining the EMF in the described emergency *** the modeling process,the objects being studied were represented by segments of thin wires to analyze the distribution of the electric charge and calculate the intensities of the electric and magnetic *** approach was implemented in the Fazonord software,and the modeling results show a substantial increase in EMF levels close to the support,with a noticeable decrease in the levels as the distance from it *** procedure implemented in the commercial software Fazonord is universal and can be used to determine electromagnetic fields at any electrical power facility that includes live parts of limited *** on the proposed procedure,the EMF near the supports of overhead power lines and traction networks of various designs could be determined,the EMF levels at substations can be calculated,and the influence of metal structures located near traction networks,such as pedestrian crossings at railway stations,can be considered.

关键词： Power supply systems AC railways Emergency conditions Electromagnetic fields near supports Modeling Electromagnetic safety

Revisiting the stretch-induced force deficit:A systematic review with multilevel meta-analysis of acute effects

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Journal of Sport and Health Science 2024年第6期13卷 805-819页

作者： konstantin Warneke Lars Hubertus Lohmann Institute of Human Movement Science Sport and HealthUniversity of GrazGraz 8010Austria Institute of Sport Science Alpen-Adria University of KlagenfurtKlagenfurt am Worthersee 9020Austria Institute of Human Movement and Exercise Physiology University of JenaJena 07749Germany

Background:When recommending avoidance of static stretching prior to athletic performance,authors and practitioners commonly refer to available systematic ***,effect sizes(ES)in previous reviews were extracted in major part from studies lacking control conditions and/or prepost testing ***,currently available reviews conducted calculations without accounting for multiple study outcomes,with ES:0.03 to 0.10,which would commonly be classified as ***:Since new meta-analytical software and controlled research articles have appeared since 2013,we revisited the available literatures and performed a multilevel meta-analysis using robust variance estimation of controlled prepost trials to provide updated ***,previous research described reduced electromyography activity—also attributable to fatiguing training routines—as being responsible for decreased subsequent *** second part of this study opposed stretching and alternative interventions sufficient to induce general fatigue to examine whether static stretching induces higher performance losses compared to other exercise ***:Including 83 studies with more than 400 ES from 2012 participants,our results indicate a significant,small ES for a static stretch-induced maximal strength loss(ES=0.21,p=0.003),with high magnitude ES(ES=0.84,p=0.004)for stretching durations60 s per bout when compared to passive *** opposed to active controls,the maximal strength loss ranges between ES:0.17 to0.28,p<0.001 and 0.040 with mostly no to small ***,stretching did not negatively influence athletic performance in general(when compared to both passive and active controls);in fact,a positive effect on subsequent jumping performance(ES=0.15,p=0.006)was found in ***:Regarding strength testing of isolated muscles(e.g.,leg extensions or calf raises),our results confirm previous ***,since no(or even positive)e

关键词： Static stretching Maximal strength Athletic performance Performance testing

The effect of SiO2 nanoparticles derived from hydrothermal solutions on the performance of portland cement based materials

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Frontiers of Earth Science 2017年第4期11卷 436-445页

作者： Ismaei FLORES-VIVIAN Rani G.K PRADOTO Mohamadreza MOINI Marina KOZHUKHOVA Vadim POTAPOV konstantin sobolev Department of Civil Engineering and Mechanics Advanced and Nano Cement-Based Materials Laboratory University ofWisconsin-Milwaukee Milwaukee 53211 USA Universidad Aut6noma de Nuevo Le6n Av. Universidad s/n Cd. Universitaria San Nicoldts de los Garza 66455 Nuevo Le6nMExico The Belgorod State Technological University named after V.G. Shoukhov Belgorod Russia Geotechnological Research Center Far East Branch of Russian Academy of Science Petropavlovsk-Kamchatsky 683002 Russia

The nanoparticles of SiO2 were used in cement systems to modify the rheological behavior, to enhance the reactivity of supplementary cementitious materials, and also to improve the strength and durability. In this research, low-cost nano-SiO2 particles from natural hydrothermal solutions obtained by membrane ultrafiltration and, optionally, by cryochemical vacuum sublimation drying, were evaluated in portland cement based systems. The SiO2-rich solutions were obtained from the wells of Mutnovsky geothermal power station （Far East of Russia）. The constant nano-SiO2 dosage of 0.25% （as a solid material by weight of cementitious materials） was used to compare the cement systems with different nanoparticles against a reference mortar and a commercially available nano-SiO2. Nanoparticles were characterized by X-Ray Diffraction （XRD）, BET Surface Area, Scanning Electron Microscope （SEM） and Fourier Transform Infrared （FTIR） spectroscopy techniques. It was demonstrated that the addition of polycarboxylate ether superplasticizer and the dispersion treatment using an ultrasound processor can be used to facilitate the distribution ofnano-SiOz particles in the mixing water. The effect ofnano-SiO2 particles in portland cement mortars was investigated by evaluating the flow, heat of hydration and compressive strength development. It was demonstrated that the use ofnano- SiO2 particles can reduce the segregation and improve strength properties.

关键词： ultrafiltration cryochemical vacuum sublimation drying nanoparticles portland cement heat of hydration,surface area compressive slxength

S-,P-stabilized bromoallenes for modular allenylborylation of alkenes

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Science China Chemistry 2024年第1期67卷 360-367页

作者： Jixin Wang Donghao Luo Ying Hu Zhili Duan Jianlin Yao konstantin Karaghiosoff Jie Li Key Laboratory of Organic Synthesis of Jiangsu Province Suzhou Key Laboratory of Pathogen Bioscience and Anti-infective MedicineCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Department Chemie Ludwig-Maximilians-Universitat MunchenButenandtstr.5-13Haus F81377 MunichGermany State Key Laboratory and Institute of Elemento-Organic Chemistry Haihe Laboratory of Sustainable Chemical TransformationsCollege of ChemistryNankai UniversityTianjin 300071China

Simultaneously forming a carbon-carbon and a carbon-heteroatom bond in a single step through transition metal-catalyzed alkene difunctionalization strategy has emerged as a powerful tool for synthetic organic *** to the uncontrollable reactivity,direct cross-coupling with bromoallenes as the building blocks for the selective allenation and borylation remains *** herein report a new type of S-and P-stabilized bromoallenes for palladium-catalyzed modular allenation and borylation of alkenes to the divergent synthesis of multiply functionalized allenes in a highly regio-and diastereoselective *** reaction features broad substrate scope and wide functional group compatibility,thus providing a straightforward method to install allenyl and boryl groups across *** experiments highlight the crucial importance of S-,P-stabilization for the oxidative insertion of Pd-species into the allenyl-Br *** facile syntheses of bioactive allenic steroids and exocyclic allenes demonstrate the synthetic utility of this protocol.

关键词： alkene difunctionalization olefins bromoallenes allenylborylation palladium

Investigation of Cavitation in NaCl Solutions in a Sonochemical Reactor Using the Foil Test Method

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Fluid Dynamics & Materials Processing 2024年第5期20卷 1093-1102页

作者： Michael Kuchinskiy Tatyana Lyubimova konstantin Rybkin Anastasiia Sadovnikova Vasiliy Galishevskiy Institute of Continuous Media Mechanics UB RAS Perm614013Russia Faculty of Physics Perm State UniversityPerm614068Russia

Ultrasonic baths and sonochemical reactors are widely used in industrial applications dealing with surface cleaningand chemical synthesis. The processes of erosion, cleaning and structuring of the surface can be typically controlledby changing relevant influential parameters. In particular, in this work, we experimentally investigate theeffect of NaCl concentration (0–5.5 mol/L) on the erosion of an aluminum foil under ultrasonic exposure at afrequency of 28 kHz. Special attention is paid to the determination of cavitation zones and their visualizationusing heat maps. It is found that at low NaCl concentration (0.3 mol/L), the foil destruction rate is higher thanin distilled water. At higher concentrations of salt, cavitation takes place mainly in the upper part of the container.

关键词： Ultrasound NaCl solution foil test cavitation activity