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Defence Technology（防务技术） 2024年第3期33卷 66-77页

作者： Tihomir kovacevic Slavko Mijatov Jelena Grzetic Suzana Cakic Bojana Fidanovski Sasa Brzic Military Technical Institute Ministry of DefenceRatka Resanovica 1BelgradeSerbia Faculty of Technology University of NisBulevar osloboCenja 124LeskovacSerbia

Conventional plasticizers deteriorate mechanical and viscoelastic properties of the propellants due to their migration upon aging and long-term storage,which affects reliability and safety properties during *** address this issue,conventional plasticizer,dioctyl adipate(DOA),is replaced by reactive one,castor oil(CO).In addition,three different types of HTPB were used to obtain propellants with designed viscoelastic and mechanical *** CO increased propellants viscosity,without a significant impact on the propellant processability,regardless to the type of ***,mechanical properties were different depending on the type of resin,which were further analyzed by gel permeation chromatography(GPC).Addition of CO formed a denser polymer network and shifted T_(g) to higher values,compared to the compositions with *** tensile strength of CO-containing propellants was lower at +20℃ and +50℃ compared to the reference compositions,while the strain at maximum load and strain at break were significantly increased with pronounced plastic deformation,especially for samples at -30℃.The inclusion of CO in the propellants composition gives more room for adjusting a wide range of mechanical properties.

关键词： HTPB-based composite propellants Castor oil Reactive plasticizer Gel permeation chromatography Sol-gel analysis Mechanical and viscoelastic properties

Biological characteristics and clinical management of uveal and conjunctival melanoma

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Oncology Research 2024年第8期32卷 1265-1285页

作者： SNJEŽANA KAŠTELAN ANA DIDOVIĆPAVIČIĆ DARIA PAŠALIĆ TAMARA NIKUŠEVA-MARTIĆ SAMIRČANOVIĆ PETRA kovaČEVIĆ SUZANA KONJEVODA School of Medicine University of ZagrebZagreb10000Croatia Department of Ophthalmology Clinical Hospital DubravaZagreb10000Croatia Department of Ophthalmology Zadar General HospitalZadar23000Croatia Department of Medical Chemistry Biochemistry and Clinical ChemistrySchool of MedicineUniversity of ZagrebZagreb10000Croatia Department of Biology and Genetics School of MedicineUniversity of ZagrebZagreb10000Croatia School of Medicine University of SplitSplit21000Croatia Department of Health Studies University of ZadarZadar23000Croatia

Uveal and conjunctival melanomas are relatively rare tumors;nonetheless,they pose a signiﬁcant risk of mortality for a large number of affected *** pathogenesis of melanoma at different sites is very similar,however,the prognosis for patients with ocular melanoma remains unfavourable,primarily due to its distinctive genetic proﬁle and tumor *** of considerable advances in understanding the genetic characteristics and biological behaviour,the treatment of uveal and conjunctival melanoma remains a formidable *** enhance the prospect of success,collaborative efforts involving medical professionals and researchers in theﬁelds of ocular biology and oncology are *** data show a lack of well-designed randomized clinical trials and limited beneﬁts in current forms of treatment for these *** advancements in the development of effective melanoma therapeutic strategies,all current treatments for uveal melanoma(UM)and conjunctival melanoma(CoM)remain unsatisfactory,resulting in a poor long-term *** trials offer hope for positive outcomes in advanced and metastatic tumors.A more comprehensive understanding of the genetic and molecular abnormalities involved in the development and progression of ocular melanomas opens the way for the development of personalized therapy,with various potential therapeutic targets currently under *** comprehension of the molecular pathogenesis of UM and CoM and their speciﬁcities may aid in the development of new and more effective systemic therapeutic agents,with the hope of improving the prognosis for patients with metastatic disease.

关键词： Uveal melanoma Conjunctival melanoma Genetic characteristics Immune checkpoint inhibitors Target molecular inhibitors

Differences in nano-topography and tribochemistry of ZDDP tribofilms from variations in contact configuration with steel and DLC surfaces

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Friction 2022年第2期10卷 296-315页

作者： Lucija COGA Somayeh AKBARI Janez kova Mitjan KALIN NanoSciTec GmbH Munich 80687Germany Department of Surface Engineering and Optoelectronics Jo?ef Stefan InstituteLjubljana 1000Slovenia Laboratory for Tribology and Interface Nanotechnology Faculty of Mechanical EngineeringUniversity of LjubljanaLjubljana 1000Slovenia

In this work,we evaluated the effect of the counter-body material(the same or dissimilar)and contact configuration(moving or stationary body),at similar contact tribological conditions,on the tribochemical and nanotopography characteristics of adsorbed surface *** dialkyldithiophosphate(ZDDP),the best performing anti-wear additive,was used in self-mated steel/steel and DLC/DLC contacts,which were compared with mixed steel/DLC and DLC/steel contacts in 1-h and 6-h sliding *** macroscale(tribometer)and nanoscale(atomic force microscopy)friction,thickness,topography,and chemical(attenuated total reflection-Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy)properties of the tribofilms were *** results revealed unexpectedly large differences in all the studied tribofilm parameters;this is because all the tribofilms are completely different;this includes the chemical composition,which is known to have a crucial effect on the nano-and macro-scale tribological *** results clearly demonstrate that the surface material,additives,and common contact operating parameters,that is,pressure,velocity,and temperature,crucially affect the ZDDP tribofilm as well as the position of the moving or stationary surface within the contact,and the material of the moving/stationary bodies.

关键词： dithiophosphate(ZDDP) diamond-like carbon(DLC) steel tribofilm tribochemistry nano-friction thickness topography

Genetic differentiation in functional traits among wild cherry (Prunus avium L.) half-sib lines

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Journal of Forestry Research 2022年第3期33卷 991-1003页

作者： Srđan Stojnić Branislav kovačević Marko Kebert Verica Vasić Vanja Vuksanović Branislav Trudić Saša Orlović Institute of Lowland Forestry and Environment University of Novi SadAntonaČehova 13dNovi Sad21000Serbia Faculty of Agriculture University of Novi SadTrg Dositeja Obradovića 8Novi Sad21000Serbia Food and Agriculture Organization of the United Nations Viale delle Terme di Caracalla00153RomeItaly

Understanding intra-specific variation in leaf functional traits is one of the key requirements for the evaluation of species adaptive capacity to ongoing climate change, as well as for designing long-term breeding and conservation strategies. Hence, data of 19 functional traits describing plant physiology, antioxidant properties, anatomy and morphology were determined on 1-year-old seedlings of wild cherry (Prunus avium L.) half-sib lines. The variability within and among half-sib lines, as well as the estimation of multi-trait association, were examined using analysis of variance (ANOVA) followed by Tukey's honestly significant difference test and multivariate analyses: principal component analysis (PCA), canonical discriminant analysis (CDA) and stepwise discriminant analysis (SDA). Pearson’s correlation coefficient was used to evaluate linear correlation between the study parameters. The results of the ANOVA showed the presence of statistically significant differences (P < 0.01) among half-sib lines for all study traits. The differences within half-sib lines, observed through the contribution of the examined sources of variation to the total variance (%), had higher impact on total variation in the majority of the examined traits. Pearson’s correlation analysis and PCA showed strong relationships between gas exchange in plants and leaf size and stomatal density, as well as between leaf biomass accumulation, intercellular CO_(2) concentration and parameters related to antioxidant capacity of plants. Likewise, the results of SDA indicate that transpiration and stomatal conductance contributed to the largest extent, to the discrimination of the wild cherry half-sib lines. In addition, PCA and CDA showed separation of the wild cherry half-sib lines along the first principal component and first canonical variable with regards to humidity of their original sites. Multiple adaptive differences between the wild cherry half-sib lines indicate high potential of the specie

关键词： Wild cherry Common garden experiment Variability Multivariate statistics Leaf functional traits

Reevaluation of dialect boundaries in the Yellowhammer(Emberiza citrinella)based on citizen science data:Should we split or lump?

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Avian Research 2023年第3期14卷 361-368页

作者： Lucie Diblíkova Pavel Pipek Stanislav Vosolsobe Adam Petrusek Tereza Petruskova Charles University Faculty of ScienceDepartment of EcologyVinicna 7PragueCZ-12800Czech Republic Czech Academy of Sciences Institute of BotanyDepartment of Invasion EcologyZamek 1PrůhoniceCZ-25243Czech Republic Charles University Faculty of ScienceDepartment of Experimental Plant BiologyVinicna 5PragueCZ-12800Czech Republic

Dialects are a specific form of geographic variation of birdsong with relatively sharp boundaries between distinct song characteristics,which provide opportunities for focused studies of processes underlying the emergence of spatial patterns in *** songbird species that exhibit dialects became models for such research,and for some of them large-scale datasets were assembled that included recordings provided by the *** them,the Yellowhammer(Emberiza citrinella,Emberizidae) is particularly prominent,as it has been recently a subject of dedicated citizen science projects focusing on its dialect *** most successful,in terms of public participation as well as the number and density of obtained recordings,was the Dialects of Czech Yellowhammers(DCY) project,which assembled detailed data at the whole-country level.A mosaic of almost all common song variants known across Europe was observed in Czechia,but the results indicated that some of the traditionally recognized Yellowhammer dialects may not represent geographically clustered song variants,at least not in Central *** quantitatively analysed variation(frequency and temporal characteristics and modulation) of the terminal song element in three dialects defined by arbitrary frequency thresholds in *** analyses indicated that pooling these to two distinct groups reflects the variation in the songs,as well as their spatial distribution,better than retaining the current classification to three dialects or their finer splitting to even more *** provide simple measures that may be used for classification of these Yellowhammer song variants in Central ***,we warn from indiscriminate transposing of results from one region to another,as that may lead to substantial *** studies of birdsong variation will benefit from big data assembled by citizen scientists,but to maximise their usefulness for further dialect research,careful delineation of d

关键词： Birdsong Geographic variation Bioacoustics Dialects Public participation

Maternal diaphragmatic hernia in pregnancy:A systematic review with a treatment algorithm

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世界临床病例杂志 2023年第27期11卷 6440-6454页

作者： Goran Augustin Diana kovač Vesna Sokol Karadjole Vendy Zajec Mislav Herman Pero Hrabač Department of Surgery University Hospital Centre ZagrebZagreb 10000Croatia Chair of Surgery School of Medicine University of ZagrebZagreb 10000Croatia Institute of Emergency Medicine of Dubrovnik-Neretva County Croatian Institute of Emergency MedicineDubrovnik 20000Croatia Department of Gynaecology and Obstetrics University Clinical Hospital Centre ZagrebZagreb 10000Croatia Department of Gynaecology and Obstetrics University Hospital Centre ZagrebZagreb 10000Croatia Department of Biostatistics "AndrijaŠtampar"School of Public HealthZagreb 10000Croatia

BACKGROUND Diaphragmatic hernia(DH)is extremely rarely described during *** to the rarity,there is no diagnostic or treatment algorithm for DH in *** To summarize and define the most appropriate diagnostic methods and therapeutic options for DH in pregnancy based on scarce *** Literature search of English-,German-,Spanish-,and Italian-language articles were performed using PubMed(1946–2021),PubMed Central(1900–2021),and Google *** PRISMA protocol was *** search terms included:Maternal diaphragmatic hernia,congenital hernia,pregnancy,cardiovascular collapse,mediastinal shift,abdominal pain in pregnancy,hyperemesis,diaphragmatic rupture during labor,puerperium,hernie diaphragmatique maternelle,hernia diafragmática *** studies were identified by reviewing reference lists of retrieved ***,imaging,surgical,and obstetric data were *** One hundred and fifty-eight cases were *** average maternal age increased across observed *** proportion of congenital hernias increased,while the other types appeared *** DHs were left-sided(83.8%).The median number of herniated organs declined across observed periods.A working diagnosis was correct in 50%.DH type did not correlate to maternal or neonatal *** access increased while thoracotomy varied across *** of less than 3 days carried a significant risk of strangulation in *** The clinical presentation of DH is easily confused with common chest conditions,delaying the diagnosis,and increasing maternal and fetal *** DH should be included in the differential diagnosis of pregnant women with abdominal pain associated with dyspnea and chest pain,especially when followed by *** diagnosis and immediate intervention lead to excellent maternal and fetal outcomes.A proposed algorithm helps manage pregnant women with maternal ***

关键词： Maternal diaphragmatic hernia Pregnancy Differential diagnosis Maternal mortality Fetal mortality Algorithm

In-hole velocity of detonation(VOD) measurements as a framework for the selection type of explosive

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International Journal of Mining Science and Technology 2015年第4期25卷 675-680页

作者： Mesec Josip Zganec Stjepan kova Ivan University of Zagreb Geotechnical Faculty in Varazdin Minervo d.d.

Velocity of detonation(VOD) is one of the most important properties of explosives and indicates performances of explosives in real time. With the development of blast monitoring systems, continuous VOD monitoring systems are recently available. The VOD measurement in holes helps in comparing and evaluating relative performances of explosives. The purpose of this paper is a framework for selecting the type of *** paper analyses the results of VOD measurements, carried out at the limestone quarry rnotii(rni kal), Slovenia. Experiments were conducted to measure VOD in blast holes which were loaded with ANFO, heavy ANFO and emulsion explosives. The explosives are produced at the point of use with mobile equipment. In this study, resistance wire continuous VOD measurement system Micro Trap, VODSYS-4from MREL was used and framework for selection the type of explosives has been suggested.

关键词：视频点播系统乳化炸药实验测量炸药类型爆轰速度框架显示性能斯洛文尼亚

Computational Analysis of Position-dependent Disorder Content in DisProt Database

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Genomics, Proteomics & Bioinformatics 2012年第3期10卷 158-165页

作者： Jovana J.kovaevi Faculty of Mathematics University of BelgradeBelgrade 11001Serbia

A bioinformatics analysis of disorder content of proteins from the DisProt database has been performed with respect to position of dis- ordered residues. Each protein chain was divided into three parts： N- and C- terminal parts with each containing 30 amino acid （AA） residues and the middle region containing the remaining AA residues. The results show that in terminal parts, the percentage of disor- dered AA residues is higher than that of all AA residues （17% of disordered AA residues and 11% of all）. We analyzed the percentage of disorder for each of 20 AA residues in the three parts of proteins with respect to their hydropathy and molecular weight. For each AA, the percentage of disorder in the middle part is lower than that in terminal parts which is comparable at the two termini. A new scale of AAs has been introduced according to their disorder content in the middle part of proteins： CIFWMLYHRNVTAGQDSKEP. All big hydrophobic AAs are less frequently disordered, while almost all small hydrophilic AAs are more frequently disordered. The results obtained may be useful for construction and improving predictors for protein disorder.

关键词： Intrinsically unstructured/disordered proteins Unstructured/disordered regions DisProt database

A Comparative Study on the Role of Cytokinins in Caryopsis Development in the Maize miniature1 Seed Mutant and Its Wild Type

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Journal of Integrative Plant Biology 2009年第9期51卷 840-849页

作者： Tomaz Rijavec Maja kova Ale Kladnik Prem S.Chourey Marina Dermastia National Institute of Biology Department of Biotechnology and Systems Biology Department of Biology Biotechnical FacultyUniversity of Ljubljana US Department of Agriculture Agricultural Research ServiceChemistry Research Unit

We report here on a comparative developmental profile of plant hormone cytokinins in relation to cell size, cell number and endoreduplicaUon in developing maize caryopsis of a cell wall invertase-deficient miniature1 （mn1） seed mutant and its wild type, Mn1, genotype. Both genotypes showed extremely high levels of total cytokinins during the very early stages of development, followed by a marked and genotype specific reduction. While the decrease of cytokinins in Mn1 was associated with their deactivation by 9-glucosylation, the absolute and the relative part of active cytokinin forms was higher in the mutant. During the exponential growth phase of endosperm between 6 d after pollination and 9 d after pollination, the mean cell doubling time, the absolute growth rate and the level of endoreduplication were similar in the two genotypes. However, the entire duration of growth was longer in Mnl compared with mnl, resulting in a significantly higher cell number in the Mnl endosperm. These data correlate with the previously reported peak levels of the Mn1-encoded cell wall invertase-2 （INCW2） at 12 d after pollination in the Mn1 endosperm. A model showing possible crosstalk among cytokinins, cell cycle and cell wall invertase as causal to increased cell number and sink strength of the Mn1 developing endosperm is discussed.

关键词： 9-glucosylation cell wall invertase cytokinins maize caryopsis miniature1.

Vertex-antimagic Labelings of Regular Graphs

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Acta Mathematica Sinica,English Series 2012年第9期28卷 1865-1874页

作者： Ali AHMAD Kashif ALI Martin BACA Petr kovaR Andrea SEMANICOVA-FENOVCíkova College of Computer Science and Information Systems Jazan University Faculty of Mathematics COMSATS Institute of Information Technology Department of Applied Mathematics and Informatics Technical University Department of Applied Mathematics VB-Technical University of Ostrava

Let G = （V, E） be a finite, simple and undirected graph with p vertices and q edges. An （a, d）-vertex-antimagic total labeling of G is a bijection f from V（G） t2 E（G） onto the set of consecutive integers 1, 2,... ,p ＋ q, such that the vertex-weights form an arithmetic progression with the initial term a and difference d, where the vertex-weight of x is the sum of the value f（x） assigned to the vertex x together with all values f（xy） assigned to edges xy incident to x. Such labeling is called super if the smallest possible labels appear on the vertices. In this paper, we study the properties of such labelings and examine their existence for 2r-regular graphs when the difference d is 0, 1,..., r ＋ 1.

关键词： Super vertex-antimagic total labeling vertex-antimagic edge labeling regular graph