Tongan secondary students’ conceptions of schooling in New Zealand relative to their academic achievement

Mo’ale ‘Otunuku 서울대학교 교육연구소 2013 Asia Pacific Education Review Vol.14 No.3

This study examines the relationship between Tongan students’ attitudes and beliefs towards their school experiences and their academic achievement on the high-stakes National Certificate of Educational Achievement (NCEA) assessments in English and mathematics. Data were obtained from using previously published self-reported inventories on a sample of Tongan senior students in New Zealand secondary schools. Confirmatory factor analysis of students’ conceptions found good fit measurement models for each domain (teaching, learning, and assessment). Structural equation modelling was used to identify the effect of the various beliefs upon students’ total score in each subject and upon internal and externally assessed performance. It was noted that different beliefs became statistically significant predictors of performance, depending on the subject and type of assessment. Nonetheless, all three constructs played some role in at least one subject. A small-to-moderate proportion of variance in NCEA performance could be attributed to student beliefs, suggesting that efforts to help students adopt adaptive beliefs will have beneficial consequences for those students.

Development, optimization and scale-up of stereo-selective enzymatic Baeyer–Villiger oxidation of pyrmetazole to esomeprazole active ingredient in an industrial-scale slurry reactor

Marko Herga,Aleš Gaspari9,Marko Bitenc,Andrej Pohar,Blaž Likozar 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-

An industrial-scale stereo-selective enzymatic oxidation process for the conversion of pyrmetazole toesomeprazole was developed and optimized. Slurry-to-slurry stages are highly demanding syntheticoperations due to several deteriorating factors: competing equilibria, mass transfer limitations and longtermbio-catalytic activity. Challenging characteristics of this bio-oxidation included foaming, thickening,continuous dynamic changes in viscosity, mass transport, and bio-catalyst inactivation. By screening pH,optimization of reactant loading ratios, and modification of control, crucial production attributes ofmaterials, such as substrate particle size, were controlled and better batch-to-batch stability and scale-upwas achieved.

Non-linear analysis of side-plated RC beams considering longitudinal and transversal interlayer slips

Jerneja Kolšek,Tomaž Hozjan,Aleš Kroflič,Igor Planinc,Miran Saje 국제구조공학회 2014 Steel and Composite Structures, An International J Vol.16 No.6

A new mathematical model and its finite element formulation for the non-linear stress-strain analysis of a planar beam strengthened with plates bolted or adhesively bonded to its lateral sides is presented. The connection between the layers is considered to be flexible in both the longitudinal and the transversal direction. The following assumptions are also adopted in the model: for each layer (i.e., the beam and the side plates) the geometrically linear and materially non-linear Bernoulli's beam theory is assumed, all of the layers are made of different homogeneous non-linear materials, the debonding of the beam from the side-plates due to, for example, a local buckling of the side plate, is prevented. The suitability of the theory is verified by the comparison of the present numerical results with experimental and numerical results from literature. The mechanical response arising from the theoretical model and its numerical formulation has been found realistic and the numerical model has been proven to be reliable and computationally effective. Finally, the present formulation is employed in the analysis of the effects of two different realizations of strengthening of a characteristic simply supported flexural beam (plates on the sides of the beam versus the tension-face plates). The analysis reveals that side plates efficiently enhance the bearing capacity of the flexural beam and can, in some cases, outperform the tensile-face plates in a lower loss of ductility, especially, if the connection between the beam and the side plates is sufficiently stiff.

An evolutionary system for the prediction of high performance concrete strength based on semantic genetic programming

Mauro Castelli,Leonardo Trujillo,Ivo Gonçalves,Aleš Popovič 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.6

High-performance concrete, besides aggregate, cement, and water, incorporates supplementary cementitious materials, such as fly ash and blast furnace slag, and chemical admixture, such as superplasticizer. Hence, it is a highly complex material and modeling its behavior represents a difficult task. This paper presents an evolutionary system for the prediction of high performance concrete strength. The proposed framework blends a recently developed version of genetic programming with a local search method. The resulting system enables us to build a model that produces an accurate estimation of the considered parameter. Experimental results show the suitability of the proposed system for the prediction of concrete strength. The proposed method produces a lower error with respect to the state-of-the art technique. The paper provides two contributions: from the point of view of the high performance concrete strength prediction, a system able to outperform existing state-of-the-art techniques is defined; from the machine learning perspective, this case study shows that including a local searcher in the geometric semantic genetic programming system can speed up the convergence of the search process.

Reliability and risk treatment centered maintenance

Martin Pexa,Tomáš Hladík,Zdeněk Aleš,Václav Legát,Vít Havlů,Miroslav Müller,Petr Valášek 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10

We propose a new methodology for application of well-known tools – RCM, RBI and SIFpro – with the aim to treat risks by means ofsuitable maintenance. The basis of the new methodology is the complex application of all three methods at the same time and not separatelyas is typical today. The proposed methodology suggests having just one managing team for reliability and risk treatment centredmaintenance (RRTCM), employing existing RCM, RBI, and SIFpro tools concurrently. This approach allows for significant reduction ofengineering activities’ duration. In the proposed methodology these activities are staged into five phases and structured to eliminate allduplication resulting from separate application of the three tools. The newly proposed methodology saves 45% to 50% of the engineeringworkload and adequate significant financial savings.

Continuous photocatalytic, electrocatalytic and photo-electrocatalytic degradation of a reactive textile dye for wastewater-treatment processes: Batch, microreactor and scaled-up operation

Luka Suhadolnik,Andrej Pohar,Uroš Novak,Blaž Likozar,Aleš Miheli9c,Miran Ceh 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-

Reactive Red 106, a synthetic azo dye, was degraded by means of photocatalysis, electrocatalysis andphoto-electrocatalysis with an immobilized titanium dioxide nanotube catalyst. The plannedfirst part ofthe experiments was carried out inside a photo-electrocatalytic continuous-flow microreactor unit,which was used for the evaluation of the effective decomposition mechanisms, the assessment of theinvestigated degradation kinetics and the transport. The processes were described with a convection–diffusion–reaction mathematical model. Full degradation was achieved under photo-electrocatalyticoperation. The second half of the tests was executed inside a batch-vessel system, consisting of twoseparate compartments. In the anode device partition, an electrode, made of a nanometer-scaled TiO2tubefilm, was placed, whereas a Ti foil was positioned in the cathode’s electrical section. The separationof the electrolytes made it possible to analyze the conversion individually, monitoring the disintegrationof the textile pigment compound in each structural component separately, and studying the changingenvironmental phenomena for either the polarized positive or negative function. Water-based producedchemicals were determined with ultra-high-performance liquid chromatography (UHPLC), coupled withultraviolet–visible (UV–vis) or mass (MS) spectroscopy detectors. The solution was successfullydiscolored (100%) either under engineered microfluidic operation or inside a beaker’s enclosed volume. However, the rate inside the latter was faster, while there were unlike intermediate species formed ineither the anodic or cathodic electrochemical cell. The maximum conversion achieved on the anode sidewas 80% of the initial concentration of the dye, whereas 63% of the dye was degraded on the cathode side. Finally, a scaled-up input configuration was designed for treating larger feedstock capacities.

Chromatin Structural Rearrangement during Dedifferentiation of Protoplasts of Cucumis sativus L.

Vladan Ondřej,Miloslav Kitner,Ivana Doležalová,Petr Nádvorník,Božena Navrátilová,Aleš Lebeda 한국분자세포생물학회 2009 Molecules and cells Vol.27 No.4

This paper reports on the structural rearrangement of satellite DNA type I repeats and heterochromatin during the dedifferentiation and cell cycling of mesophyll protoplasts of cucumber (Cucumis sativus). These repeats were localized in the telomeric heterochromatin of cucumber chromosomes and in the chromocenters of interphase nuclei. The dramatic reduction of heterochromatin involves decondensation of subtelomeric repeats in freshly isolated protoplasts; however, there are not a great many remarkable changes in the expression profile. In spite of that, reformation of the chromocenters, occurring 48 h after protoplast isolation, is accompanied by recondensation of satellite DNA type I; however, only partial reassembly of these repeats was revealed. In this study, FISH and a flow cytometry assay show a correlation between the partial chromocenter and the repeats reassembly, and with the re-entry of cultivated protoplasts into the cell cycle and first cell division. After that, divided cells displayed a higher variability in the expression profile than did leaves’ mesophyll cells and protoplasts.

Metabolic detoxification of capsaicin by UDP-glycosyltransferase in three Helicoverpa species

Seung-Joon Ahn,Francisco R. Badenes-Pérez,Michael Reichelt,Aleš Svatoš,Bernd Schneider,Jonathan Gershenzon,David G. Heckel 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.10

Capsaicin β-glucoside was isolated from the feces of Helicoverpa armigera, H. assulta and H. zea that fed on capsaicin-supplemented artificial diet. The chemical structure was identified by NMR spectroscopic analysis as well as by enzymatic hydrolysis. The excretion rates of the glucoside were different among the three species; those in the two generalists, H. armigera and H. zea, were higher than in a specialist, H. assulta. UDP-glycosyltransferases (UGT) enzyme activities measured from the whole larval homogenate of the three species with capsaicin and UDP-glucose as substrates were also higher in the two generalists. Compared among five different larval tissues (labial glands, testes from male larvae, midgut, the Malpighian tubules, and fatbody) from the three species, the formation of the capsaicin glucoside by one or more UGT is high in the fat body of all the three species as expected, as well as in H. assulta Malpighian tubules. Optimization of the enzyme assay method is also described in detail. Although the lower excretion rate of the unaltered capsaicin in H. assulta indicates higher metabolic capacity toward capsaicin than in the other two generalists, the glucosylation per se seems to be insufficient to explain the decrease of capsaicin in the specialist, suggesting H. assulta might have another important mechanism to deal with capsaicin more specifically.

Zeolite Integrated Nanocellulose Films for Removal of Loose Anionic Reactive Dye by Adsorption vs. Filtration Mode during Textile Laundering

Vanja Kokol,Vera Vivod,Suzana Arnuš,Urh Černigoj,Betka Galičič,Kristina Obu Vazner,Branko Neral,Aleš Mihelič 한국섬유공학회 2018 Fibers and polymers Vol.19 No.7

Water stable, flexible and ecological acceptance composite films were prepared by the solvent casting process using native, dealuminated (treated with HCl to affect the surface chemistry and pore structure) and/or surface modified (coated with a cationic surfactant PDADM of different molecular weights) H-ZSM-5 type zeolite of different shapes (spherical vs. rod) and Si/Al ratios (P26 vs. P371) as adsorbents and cellulose nanofibrils (CNFs) as a networking matrix (in a weight ratio of 4:1). The films were tested for removal of the black anionic reactive dye with the highest bleeding effect at the first rinsing cycle of textile laundering. The effects of zeolite structure and surface chemistry on films dye’ removal kinetics from a standardised rinsing bath were investigated for up to 140 min at room temperature and using 0.1 g/l of dye concentration, depending on the film-to-bath weight-to-volume ratios (from 1:10 to 1:1000), thus simulating different rinsing conditions. The results show that up to 80 % of the dye was removed in the first 20 min in the lowest weight-to-volume ratio (1:10), fitting the Langmuir isotherm, and the process followed the pseudo-second order kinetic, yielding a multi-layer adsorption mechanism with a monolayer capacity of ~11 mg/g and ~21 vs. ~30 mg/g by films prepared from native or HCltreated and PDADMA100 vs. PDADMA400 coated P371 zeolites, respectively. Such efficacy was due to the more densely and fully surface-covered longitudinal P371 with PDADM400, given the huge electrostatic attraction sites for dye molecules, compared to the partly interpenetrated PDADM into relatively larger pore-sized (~450 nm vs. 220 nm) of P26. The filtration performance of the films was also examined, be used for the removal of the dye from the rinsing bath, released from the washing drum. An ultra-high flux rate (11.000 kL/m2 h MPa) with 45 % of dye removal efficacy and capacity of ~24 mg/g was provided by films prepared from spherical and aggregated P26PDADMA-400, showing its high potential also as a filter membrane.

One-Stop Management to Initiate Thrombolytic Treatment on the Computed Tomography Table: Adoption and Results

Michal Haršány,Michal Bar,David Černík,Roman Herzig,René Jura,Lubomír Jurák,Jiří Neumann,Daniel Šaňák,Svatopluk Ostrý,Petr Ševčík,Ondřej Škoda,David Školoudík,Daniel Václavík,Aleš Tomek,Robert Mikulík 대한뇌졸중학회 2021 Journal of stroke Vol.23 No.3

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