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Impact of water scarcity on spruce and beech forests

Journal of Forestry Research 2019年第3期30卷 899-909页

作者： Lenka Krupkova Katerina Havrankova Jan Krejza Pavel Sedlak michal V.Marek Global Change Research Institute Czech Academy of SciencesBelidla 986/4a60300 BrnoCzech Republic Institute of Atmospheric Physics Czech Academy of SciencesBocni II 140114131 PragueCzech Republic

One of the greatest threats posed by ongoing climate change may be regarded the drought caused by changes in precipitation distribution. The aim of presented study was to characterize reactions to dry conditions and conditions without drought stress on gross primary production (GPP) and net ecosystem production (NEP) of spruce and beech forests, as these two species dominate within the European continent. Daily courses of GPP and NEP of these two species were evaluated in relation to an expected decrease in CO2 uptake during dry days. The occurrence of CO2 uptake hysteresis in daily production was also investigated. Our study was performed at Bily Kriz(spruce) and Stitna(beech) mountain forest sites during 2010–2012 period. We applied eddy covariance technique for the estimation of carbon fluxes, vapor pressure deficit and precipitation characteristics together with the SoilClim model for the determination of drought conditions, and the inverse of the Penman–Monteith equation to compute canopy conductance. Significant differences were found in response to reduced water supply for both species. Spruce reacts by closing its stomata before noon and maintaining a reduced photosynthetic activity for the rest of the day, while beech keeps its stomata open as long as possible and slightly reduces photosynthetic activity evenly throughout the entire day. In the spruce forest, we found substantial hysteresis in the light response curve of GPP. In the beech forest, the shape of this curve was different: evening values exceeded morning values.

关键词： Picea abies Fagus sylvatica Drought stress Hysteresis Eddy covariance

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Mitomycin C and capecitabine: An additional option as an advanced line therapy in patients with metastatic colorectal cancer

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World Journal of Gastrointestinal Oncology 2023年第11期15卷 1913-1924页

作者： Gil Mullin michal Sternschuss Yosef Landman Aaron Sulkes Baruch Brenner Faculty of Medicine Tel-Aviv UniversityTel Aviv 6997801Israel Institute of Oncology Davidoff Cancer CenterBeilinson CampusPetah-Tikva 4941492Israel

BACKGROUND In recent years survival of patients with metastatic colorectal cancer(mCRC),though still limited,has improved significantly;clearly,when the disease becomes refractory to standard regimens,additional treatment options are *** have shown that mitomycin C(MMC),an antitumor antibiotic,and capecitabine,a precursor of 5-fluorouracil,may act synergistically in *** efficacy of MMC/capecitabine has been demonstrated in the first-line setting,but only a few small studies have tested it in the advanced-line setting,with contradictory *** a median of 2 MMC/capecitabine cycles(range 0.5-9.0).Thirty-four patients(28.6%)experienced grade≥3 toxicity,including 2(1.7%)with grade 4;there was no drug-related *** objective response rate was 0.8%,and the disease control rate,24.4%.Median progression-free survival(PFS)was 2.1 mo(range 0.2-20.3),and median overall survival,4.8 mo(range 0.2-27.5).The 6-month overall survival rate was 44%;8.7%of patients remained *** associated with longer PFS were lower gamma-glutamyl transferase level(P=0.030)and primary tumor location in the left colon(P=0.017).Factors associated with longer overall survival were lower gamma-glutamyl transferase level(P=0.022),left-colon tumor location(P=0.044),low-to-moderate histological grade(P=0.012),Eastern Cooperative Oncology Group performance status 0-1(P=0.036),and normal bilirubin level(P=0.047).CONCLUSION MMC/capecitabine is an active,available,and relatively safe regimen for use beyond standard lines of therapy in *** clinical and laboratory parameters can identify patients more likely to benefit.

关键词： Colorectal cancer Metastatic cancer Chemotherapy Mitomycin C/Capecitabine Advanced line treatment

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Shock-induced fracture of dolomite rock in small-scale blast tests

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第6期14卷 1823-1835页

作者： Pawel Baranowski michal Kucewicz Mateusz Pytlik Jerzy Matachowski Military University of Technology Faculty of Mechanical EngineeringInstitute of Mechanics&Computational Engineering2 Gen.S.Kaliskiego Street00-908WarsawPoland Central Mining Institute Conformity Assessment Body40-166KatowicePoland

This paper attempts to study dolomite failure using small-scale blast *** experimental setup consisted of a cylindrical specimen with a central borehole fitted with a detonation cord inside a copper *** specimen was confined using lead *** the test,acceleration histories were recorded using sensors placed on the lead *** results showed that heterogeneity and initial cracks significantly influenced the observed failure and cracking *** tests were numerically represented using the previously validated Johnson-HolmquistⅡ(JH-2)constitutive *** properties of the detonation cord were first determined and verified in a special test with a lead specimen to compare the deformation in the test with that of numerical ***,the small-scale blast test was simulated,and the failure of the dolomite was compared with the test *** of acceleration histories,scabbing failure,and number of radial cracks and crack density confirmed the overall repeatability of the actual testing *** is likely that the proposed model can be further used for numerical studies of blasting of dolomite rock.

关键词： Johnson-HolmquistⅡmodel(JH-2) Rock Blasting Fracture Small-scale test

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Field-emission electron gun for a MEMS electron microscope

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Microsystems & Nanoengineering 2021年第3期7卷 139-147页

作者： michal Krysztof Department of Microsystems Faculty of Microsystem Electronics and PhotonicsWroclaw University of Science and Technologyul.Z.Janiszewskiego 11/1750-372 WroclawPoland

This article presents a field-emission electron gun in tended for use in a MEMS(microelectromechanical system)electron *** fabricati on process follows the tech no logy of a miniature device under development built from silicon electrodes and glass *** electron gun contains a silicon cathode with a single very sharp protrusion and a bundle of disordered CNTs deposited on its end(called a sharp silicon/CNT cathode).It was tested in diode and triode con *** the diode con figuration,a low threshold voltage<1000V and a high emission current that reached 90 pA were *** 30 min of operation at 900 V,the emission current decreased to 1.6 pA and was stable for at least 40 min,with RMS fluctuation in the anode current lower than 10%.The electron beam spot of the source was observed on the phosphor *** the diode configuration,the spot size was the same as the emission area(~10 pm)z which is a satisfactory *** the triode configuration,an extraction electrode(gate)control function was *** gate limited the emission current and elongated the lifetime of the gun when the current limit was ***,the electron beam current fluctuations at the anode could be reduced to〜1%by using a feedback loop circuit that controls the gate voltage,regulating the anode *** developed sharp silicon/CNT cathodes were used to test the MEMS electron source demonstrator,a key component of the MEMS electron microscope,operating under atmospheric pressure *** of the phosphor layer(ZnS:Ag)deposited on the thin silicon nitride membrane(anode)was observed.

关键词： sharp figuration lifetime

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Effect of harmonic distortion on electric energy meters of different metrological principles

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Frontiers in Energy 2019年第2期13卷 377-385页

作者： Illia DIAHOVCHENKO Vitalii VOLOKHIN Victoria KUROCHKINA michal SPES michal KOSTEREC Department of Electrical Power Engineering Sumy State University Sumy 40037 Ukraine Department of Electric Power Engineering Technical University of Kosice Kosice 04200Slovakia

This paper deals with the errors of electric energy metering devices as a result of distortions in the shape of the curves of voltage and current load. It is shown and proved that the errors in energy measurements depend on the design and the algorithms used in electricity meters. There are three main types of metering devises having different principles: inductive (electro-mechanical), elec-tronic static, and digital electronic (microprocessor). Each of these types has its measuring features. Some devices take into account all the harmonic distortions and the constant component which occur in the network while others measure the power and energy values of the fundamental harmonic only. Such traits lead to the discrepancies in the readings of commercial electric energy meters of different types. Hence, the violations in the measurement system unity occur, and a significant error can be observed in the balance of transmitted/consumed electric energy.

关键词： current distortion electric energy meter harmonics power quality

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A damping boundary condition for atomistic-continuum coupling

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Chinese Physics B 2017年第6期26卷 508-515页

作者：张杰 Kiet Tieu Guillaume michal 朱洪涛张亮苏利红邓关宇王辉 School of Mechanical Materialsand Mechatronic EngineeringUniversity of Wollongong Department of Materials Science and Engineering Kyoto University

The minimization of spurious wave reflection is a challenge in multiscale coupling due to the difference of spatial resolution between atomistic and continuum regions. In this study, a new damping condition is presented for eliminating spurious wave reflection at the interface between atomistic and continuum regions. This damping method starts by a coarse–fine decomposition of the atomic velocity based on the bridging scale method. The fine scale velocity of the atoms in the damping region is reduced by applying nonlinear damping coefficients. The effectiveness of this damping method is verified by one-and two-dimensional simulations.

关键词： multiscale modeling spurious wave reflection coarse-fine decomposition nonlinear damping

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Effect of a Hybrid Zinc Stearate-Silver System on the Properties of Polylactide and Its Abiotic and the Biotic Degradation and Antimicrobial Activity Thereof

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Chinese Journal of Polymer Science 2018年第8期36卷 925-933页

作者： Gabriela Jandikova Petra Stoplova Antonio Di Martino Petr Stloukal Pavel Kucharczyk michal Machovsky Vladimir Sedlarik Centre of Polymer Systems University Institute Tomas Bata University in Zlin tr. Tomas Bati 5678 760 O1 Zlin Czech Republic

This work investigates the degradation and properties of a thermoplastically prepared composite comprising a polylactide/ hybrid zinc stearate-silver system. The influence of the zinc stearate-silver system on the properties of the composite is investigated by electron microscopy, differential scanning calorimetry and tensile tests. Furthermore, the antimicrobial activities of the systems are examined. The degradation behaviour of the composites is studied in both abiotic and biotic （composting） environments at an elevated temperature of 58 ℃. The results reveal good dispersion of the additive in the PLA matrix, a stabilizing effect exerted by the same on the polylactide matrix during processing, and slight reduction in glass transition temperature. The zinc stearate-silver component also reduces brittleness and extends elongation of the composite. Abiotic hydrolysis is not significantly affected, which is in contrast with pure PLA, although mineralization during the early stage of biodegradation increases noticeably. The composite exhibits antimicrobial activity, even at the lowest dosage of the zinc stearate/silver component （1 wt%）. Moreover, Ag and Zn contents were found to be present in the composite during abiotic hydrolysis, which was demonstrated by minimal diffusion of Ag ions from the matrix and very extensive washing of compounds that contained Zn.

关键词： Polylactide Composite Biodegradation Zinc stearate Silver Antimicrobial

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A new oxidovanadium(Ⅳ) Schiff base complex containing asymmetric tetradentate ONN0O0Schiff base ligand:Synthesis,characterization,crystal structure determination,thermal study and catalytic activity

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Chinese Chemical Letters 2015年第6期26卷 779-784页

作者： Gholamhossein Grivani Abbase Ghavami Vclav Eigner michal Duek Aliakbar Dehno Khalaji School of Chemistry Damghan University Department of Solid State Chemistry Institute of Chemical TechnologyTechnick Institute of Physics ASCR Department of Chemistry Faculty of ScienceGolestan University

After synthesis of an asymmetric tetradentate ONN＇O＇ Schiff base ligand （H2L） followed by reaction of the synthesized H2L with an equimolar mixture of methanolic solutions of the VO（acac）2, a new oxidovanadium（IV） Schiff base complex （VOL） was synthesized. The Schiff base ligand and its complex were characterized by FT-IR and UV-vis spectra and C, H, N analysis, The crystal structure of VOL was also determined by single crystal X-ray analysis. The VOL complex crystallizes in monoclinic space group Cc. The Schiffbase ligand acts as a tetradentate ligand through its two＇iminic nitrogens and two phenolic and acetylacetonate oxygens. Thermogravimetric analysis of the VOL showed that it decomposes in two steps and converts to mixed vanadium oxides at 477℃. In addition, thermal decomposition of the VOL complex in air at 660 ℃ leads to formation of V2O5 nanoparticles with the average size estimated from XRD 49 nm. The catalytic activity of the VOL complex was investigated in the epoxidation reaction and different reaction parameters were optimized. The results showed that the cyclic alkenes were efficiently converted to the corresponding epoxides, whereas the VOL did not appreciably convert the linear alkenes.

关键词： Oxidovanadium(IV) Scbiff base Crystal structure Nanopartide Epoxidation

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On Higher Order Pyramidal Finite Elements

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Advances in Applied Mathematics and Mechanics 2011年第2期3卷 131-140页

作者： Liping Liu Kevin B.Davies michal Krızek Li Guan Department of Mathematical Sciences Lakehead University955 Oliver RoadThunder BayOntarioP7B 5E1Canada Institute of Mathematics Academy of SciencesZitna 25CZ-11567 Prague 1Czech Republic College of Computer Science Dongguan University of TechnologyDongguan 523808GuangdongChina

In this paper we first prove a theorem on the nonexistence of pyramidal polynomial basis *** we present a new symmetric composite pyramidal finite element which yields a better convergence than the nonsymmetric *** has fourteen degrees of freedom and its basis functions are incomplete piecewise triquadratic *** space of ansatz functions contains all quadratic functions on each of four subtetrahedra that form a given pyramidal element.

关键词： Pyramidal polynomial basis functions finite element method composite elements three-dimensional mortar elements.

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Plasma-enabled sensing of urea and related amides on polyaniline

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Frontiers of Chemical Science and Engineering 2016年第2期10卷 265-272页

作者： Harinarayanan Puliyalil Petr Slobodian michal Sedlacik Ruhan Benlikaya Pavel Riha Kostya (Ken) Ostrikov Uros Cvelbar Jozef Stefan Institute (F4) Jamova cesta 39 1000 Ljubjana Slovenia Jozef Stefan International Postgraduate School Jamova cesta 39 1000 Ljubjana Slovenia Centre of Polymer Systems University Institute Tomas Bata University Trida T. Bati 5678 76001 Zlin Czech Republic Department of Secondary Science and Mathematics Education Faculty of Necatibey Education Balikesir University 10100 Balikesir Turkey Institute of Hydrodynamics Academy of Sciences Pod Patankou 5 166 12 Prague 6 Czech Republic Institute for Future Environments and Institute for Health and Biomedical Innovation School of ChemistryPhysics and Mechanical Engineering Queensland University of Technology Brisbane Queensland 4000 Australia CSIRO-QUT Joint Sustainable Materials and Devices Laboratory Commonwealth Scientific and Industrial Research Organization New South Wales 2070 Australia School of Physics The University of Sydney Sydney New South Wales 2006 Australia

The atmospheric pressure plasma jet （APPJ） was used to enhance the sensitivity of industrially important polyaniline （PANI） for detection of organic vapors from amides. The gas sensing mechanism of PANI is operating on the basis of reversible protonation or deprotonation, whereas the driving force to improve the sensitivity after plasma modifications is unknown. Herein we manage to solve this problem and investigate the sensing mechanism of atmospheric plasma treated PANI for vapor detection of amides using urea as a model. The results from various analytical techniques indicate that the plausible mechanism responsible for the improved sensi- tivity after plasma treatment is operating through a cyclic transition state formed between the functional groups introduced by plasma treatment and urea. This transition state improved the sensitivity of PANI towards 15 ppm of urea by a factor of 2.4 times PANI. This plasma treated compared to the non-treated PANI is promising for the improvement of the sensitivity and selectivity towards other toxic and carcinogenic amide analytes for gas sensing applications such as improving material proces- sing and controlling food quality.

关键词： gas sensing urea PANI amides plasma

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