bluuebunny/crossref_metadata_2025_split huggingface dataset:
Coursework selection: A frame of reference approach using structural equation modelling
Authors: Dickhäuser Oliver , Reuter Martin , Hilling Christine 
Published: November 2005

Background. Choice behaviour has far‐reaching consequences on students' educational careers. Previous models on course selection for example, the model of achievement‐related choices (Wigfield & Eccles, 2000) and of self‐efficacy theory (Bandura, 1997), stress the importance of ability perceptions (self‐concept of ability) as major determinants of choice.Aim. This article suggests a model of course selection, which assumes that comparisons within an internal frame of reference (as proposed by Marsh, 1986, for the association between achievement and self‐concepts) can also be applied to the association between self‐concepts and course selection. It is therefore hypothesized that course selection is not only positively influenced by the self‐concept with respect to the corresponding subject, but also negatively with respect to alternative subjects. Moreover, it should be tested whether the effects of previous achievement on course selection are completely mediated by the self‐concepts.Sample. These assumptions were empirically tested using a sample of 296 students from secondary school classes, who were specializing in, for example, chemistry or biology in the following school term.Method. Self‐concepts and course selection were assessed via questionnaire. The postulated models were tested using a structural equation modelling approach for ordinal variables.Results. The core assumption, that course selection is determined by dimensional comparisons, was supported by significant negative paths from self‐concepts on the selection of non‐corresponding subjects. Furthermore, the effects of previous achievement on selection were completely mediated by self‐concepts.Conclusion. Previous models of choice behaviour should be extended, by considering not only the selected alternatives, but also the unselected ones. The finding that the influence of achievement on choice is completely mediated by self‐concepts, demonstrates that subjective interpretations of previous achievement determine subsequent behaviour.
Confirmatory factor analysis of the Teacher Efficacy Scale for prospective teachers
Authors: Denzine Gypsy M. , Cooney John B. , McKenzie Rita 
Published: November 2005

Background. Research on teacher self‐efficacy has revealed substantive problems concerning the validity of instruments used to measure teacher self‐efficacy beliefs. Although claims about the influence of teachers' self‐efficacy beliefs on student achievement, success with curriculum innovation, and so on, may be true statements, one cannot make those claims on the basis of that body of evidence if the instruments are not valid measures of teachers' self‐efficacy beliefs.Aims. The purpose of this investigation is to employ the use of modern confirmatory factor‐analytic techniques to investigate the validity of the hypothesized dimensions of the Teacher Efficacy Scale (Gibson & Dembo, 1984; Woolfolk & Hoy, 1990).Sample. Participants for this investigation were 387 prospective teachers recruited from a university located in the south‐western region of the UA. Participants for Study 2 were 131 prospective elementary teachers recruited from the same university as in Study 1.Results. A confirmatory factor analysis (CFA) procedure was used to evaluate the goodness‐of‐fit for two theoretical models of the TES items. The proposed two‐ and three‐factor models of teacher self‐efficacy for prospective teachers were rejected. A re‐specified three‐factor model of the TES was then derived from theoretical and empirical considerations. The re‐specified model hypothesized three dimensions: self‐efficacy beliefs, outcome expectations, and external locus‐of‐causality. In Study 2, the re‐specified three‐factor measurement model was evaluated in a new sample. Results of the CFA procedure indicated satisfactory fit of the re‐specified model to the data; however, the results were not consistent with predictions derived from social learning theory.Conclusions. The results of this study call into question the use of the TES and the interpretation of a large body of literature purporting to study the relationship of teachers' self‐efficacy beliefs to important educational outcomes.
Early maladaptive schemas and adult attachment in a UK clinical population
Authors: Mason Oliver , Platts Helen , Tyson Mary 
Published: November 2005

Objectives. Both insecure attachment style and early maladaptive schemas have been associated with mental health difficulties. This study aimed to investigate how schemas relate to attachment style classification in mental health service users. A further aim was to investigate the nature of the relationship between psychological distress, common psychological difficulties, and attachment style.Method. Participants were 72 people in contact with mental health services who completed the short form of Young's schema questionnaire, a measure identifying their attachment style (experience of close relationships), and the clinical outcomes in routine evaluation (CORE; Evans et al., 1998) outcome measure.Results. Overall, 81% of the participants had an insecure attachment style. The fearful group were the most distressed across several domains of the CORE, followed by the preoccupied group. Schemas differed significantly according to attachment style grouping, with the fearful group possessing the greatest degree of maladaptive schemas, followed by the preoccupied group. Discriminant function analysis identified differing patterns of schemas associated with attachment style.Conclusions. The results supported the relevance of both attachment style and maladaptive schemas to individuals with mental health difficulties. Importantly, several aspects of the individuals' symptoms and difficulties and their schemas were meaningfully related to their adult attachment style. Limitations included the small number of dismissing individuals identified, the problems of self‐report in this area, and the absence of information about the quality of participants' current relationships.
Factors in outcome of cognitive‐behavioural therapy for psychosis: Users' and clinicians' views
Authors: McGowan John F. , Lavender Tony , Garety Philippa A. 
Published: November 2005

Objectives. Despite increasing evidence to suggest that cognitive‐behavioural therapy (CBT) is helpful for a significant proportion of people with psychosis, only limited information is available regarding factors implicated in outcome. The present study investigated factors differentiating outcomes on the basis of accounts from participants in the therapeutic process.Method. Four therapists and eight of their clients were interviewed about their experiences of CBT. Clients were defined as having progressed or not progressed during therapy. Interview data were analysed using a qualitative ‘grounded theory’ methodology.Results. A number of major categories differentiated the two client groups, including ability to let go of distressing beliefs, logical thought, holding therapy, and presence of a shared goal. Overall, clients who progressed were better able to move into the therapist's frame of reference. Therapists and clients also felt that non‐specific benefits accrued from the therapy for both groups.Conclusion. The results were consistent with previous studies suggesting that ability to disengage from distressing beliefs is important in therapeutic progression. Reasons considered for the inability to progress include emotional investment in psychotic beliefs and cognitive processing. Further research is required to clarify the role of logical thought and therapeutic alliance in progress and in predicting outcome.
Ultrastructural changes in a holocellulose pulp revealed by enzymes, thermoporosimetry and atomic force microscopy
Authors: Fahlén Jesper , Salmén Lennart 
Published: November 2005

Abstract
To increase our knowledge of the ultrastructure within softwood fibres, enzymatic treatment, thermoporosimetry, light microscopy, and atomic force microscopy with image analysis were used to investigate the structure of holocellulose softwood pulp fibres. The size of the average cellulose fibril aggregates and the width of pore and matrix lamellae were found to be uniform across the secondary cell-wall layer in the transverse direction of the wood fibre wall. In holocellulose, these dimensions were very similar to those in the native wood, whereas in kraft pulp the cellulose fibril aggregates were larger and the pore and matrix lamellae broader. These differences between holocellulose and kraft pulp fibres suggest that a high temperature is needed for cellulose fibril aggregation to occur. Neither refining nor drying of the holocellulose pulp changed the cellulose fibril aggregate size. Upon drying and enzymatic treatment, a small decrease in the pore and matrix lamella width was evident throughout the fibre wall. This indicated not only uniform distribution of pores throughout the fibre wall, but also enzymatic accessibility to the entire fibre wall. The holocellulose pulp had a somewhat larger pore volume than the kraft pulp. Refining of the holocellulose pulp led to pore closure, probably due to increased mobility of the fibre wall. The enzymatic treatment revealed that during hydrolysis of one hemicellulose, part of the other was also dissolved, indicating that the two hemicelluloses are to some extent linked to each other in the structure.
Molecular weight-functional group relations in softwood residual kraft lignins
Authors: Koda Keiichi , Koda Keiichi , Gaspar Armindo R. , Yu Liu , Yu Liu , Yu Liu , Argyropoulos Dimitris S. 
Published: November 2005

AbstractAn integrated picture of the distribution of functional groups should be provided as a function of molecular size within residual kraft lignins. With this goal we developed a reliable and reproducible method for determination of the molecular weight and molecular weight distribution of residual kraft lignins (RKLs) over the whole delignification range. In general, our data indicate that for reliable measurement of the molecular weight and its distribution of residual lignin in pulps, the lignin-carbohydrate bonds have to be cleaved prior to size exclusion chromatography. The recently developed method for isolating residual lignins, which involves cellulolytic treatment followed by a mild acid hydrolysis step, was found to be the most suitable approach to achieve this. The molecular weight and polydispersity of all RKLs decreased as a function of delignification. As anticipated, the observed decrease in molecular weight was clearly reflected in the concomitantly decreasing amount of β-O-4 structural linkages present. Similarly, the total phenolic hydroxyl content increased as the molecular weight of the RKLs decreased during kraft pulping. Despite the smaller size of the lignin remaining on the kraft fiber at the end of delignification, the preponderance of condensed phenolic structures within these lignins offers an explanation for delignification problems during bleaching.
Structure-activity relationships of cadinane-type sesquiterpene derivatives against wood-decay fungi
Authors: Wu Chi-Lin , Chien Shih-Chang , Wang Sheng-Yang , Kuo Yueh-Hsiung , Chang Shang-Tzen 
Published: November 2005

Abstract
Cadinane-type sesquiterpenes have a wide spectrum of biological activity, but their use as wood preservatives and the structure-activity relationships of their derivatives have not yet been reported. A total of 13 compounds were synthesized from T-cadinol, T-muurolol, and α-cadinol and their chemical structures were confirmed by IR, MS, and 1H and 13C NMR. The antifungal properties of 16 compounds against three wood-decay fungi were evaluated in vitro. α-Cadinol showed strong antifungal activity against Lenzites betulina, Trametes versicolor, and Laetiporus sulphureus (total mean IC50 0.10 mM). Among the derivatives synthesized, 3β-ethoxy-T-muurolol (0.24 mM), 4ξH-cadinan-10β-ol (0.25 mM), 4ξH-muurolan-10β-ol (0.29 mM), and 4ξH-cadinan-10α-ol (0.25 mM) showed good antifungal activity against all fungi tested. Correlation was observed between the antifungal activity of the compounds tested and log P. Furthermore, the presence of an unsaturated double bond and oxygen-containing functional groups in the compounds plays a key role in their antifungal activity. The stereo configuration of cadinane-type sesquiterpenes also influences their antifungal activity. Understanding how the structure of natural compounds relates to their antifungal function is important and may facilitate their application as novel wood preservatives.
Effect of water on wood liquefaction and the properties of phenolated wood
Authors: Lee Seung-Hwan , Wang Siqun 
Published: November 2005

Abstract
The effects of water on wood liquefaction were investigated under various reaction conditions: reaction temperature, time, and wood/phenol weight ratio. Although the addition of water decreased the reaction temperature and reduced the liquefaction rate and combined phenol content of the resulting phenolated wood, residue of <20% and a combined phenol content of >95% were obtained by controlling the reaction conditions. The addition of water suppressed an increase in the combined phenol content and molecular weight by a recondensation reaction observed in liquefaction in the absence of water under the same reaction conditions. Phenolated wood obtained in the presence of water showed comparable thermoflow properties and slightly higher activation energy for cure when compared with phenolated wood obtained in the absence of water. Moldings from both phenolated woods showed comparable flexural properties to those of moldings from commercial Novolak resin.
Effect of stress levels on compressive low-cycle fatigue behaviour of softwood
Authors: Gong Meng , Smith Ian 
Published: November 2005

AbstractLow-cycle fatigue (LCF) of spruce under parallel-to-grain compression was investigated to simulate the damage that occurs during extreme events such as hurricanes. Load control was used, with peak stress levels of 75%, 85% and 95% of static compressive strength (Cmax). Changes in the residual cyclic modulus, cyclic creep strain and modified work density were correlated with the number of load cycles to assess their suitability as damage indicators. Creep tests were also carried out and the strain compared with cyclic creep strain under LCF load. Fatigue and creep tests had a total duration of 10 min. A three-element mathematical model was used to predict the cyclic creep strain. Some key findings were that: (1) the residual cyclic modulus varies with the number of load cycles at a given stress level and decreases with an increase in stress level; (2) cyclic creep strain and pure creep strain are strongly influenced by the peak stress level; and creep specimens fail but fatigue specimens do not at a 95% peak stress level; and (3) the three-element mathematical model is appropriate for predicting cyclic creep strain.
Comparison of morphological and chemical properties between juvenile wood and compression wood of loblolly pine
Authors: Yeh Ting-Feng , Goldfarb Barry , Chang Hou-min , Peszlen Ilona , Braun Jennifer L. , Kadla John F. 
Published: November 2005

Abstract
In conifers, juvenile wood (JW) is always associated with compression wood (CW). Due to their similar properties, there is a common belief that JW is the same as CW. To resolve whether JW is identical to CW, 24 rooted cuttings of one loblolly pine clone were planted in growth chambers under normal, artificial bending, and windy environments. The results show that the morphology of JW is significantly different from CW. Furthermore, chemical analyses revealed that JW and CW are significantly different in chemical composition. Our results indicate that JW is different from CW, and the wood formed under a controlled windy environment is a mild type of compression wood.
Ultrastructure of commercial recycled pulp fibers for the production of packaging paper
Authors: Brändström Jonas , Joseleau Jean-Paul , Cochaux Alain , Giraud-Telme Nathalie , Ruel Katia 
Published: November 2005

Abstract
Transmission electron microscopy was used to investigate the ultrastructure of recycled pulp fibers originating from a household collection plant and intended for the production of packaging paper. Three recovered paper grades and recycling processes, including pulping, screening, cleaning and refining, were assessed with emphasis on surface and internal fibrillation as well as xylan localization. Results showed a large heterogeneity with respect to fiber ultrastructure within and between the grades. Screening and cleaning steps had no detectable effects, but refining clearly increased cell-wall delamination and surface fibrillation. Immunolabeling of xylans showed that they were distributed rather evenly across the cell walls. They were also present on fines. Two different mechanisms for fiber delamination and surface fibrillation were found, one which implies that internal and external fibrillation take place simultaneously across the cell wall, and another which implies successive peeling of layers or sub-layers from the outside towards the inside. It is suggested that recycled fibers of chemical pulp origin undergo the former mechanism and recycled fibers that contain lignin binding the cell wall matrix give rise to the latter peeling mechanism. Because several recycled fibers were severely delaminated and almost fractured, we suggest that to produce a good packaging paper, it is important that recycled pulp should contain a significant proportion of fibers with high intrinsic strength.
Pine and spruce roundwood species classification using multivariate image analysis on bark
Authors: Nilsson David , Edlund Ulf 
Published: November 2005

Abstract
Wood discs from 67 pine and 79 spruce logs were collected from a forest clearing. Three different 24-bit red-green-blue (RGB) images were acquired from the radial surface of each disc. The first image contained bark, the second image was a mixture of bark and wood surface, and the third image consisted only of wood surface. The image texture was compressed into vectors of Fourier-transformed wavelet coefficients. These were assembled in matrices and analysed by principal component analysis (PCA) and partial least-squares projections to latent structures (PLS). Classification using Fourier-transformed wavelet scales showed that the wood species could be predicted with 90% accuracy. A thorough examination of this classification showed that the predicting power of these models was mostly due to wavelet scales that represented the mean value of each colour channel. The prediction accuracy that could be obtained from coefficients representing image texture was generally low. The use of grey-level co-occurrence matrices prior to the wavelet transformation showed, however, that it is possible to classify the wood species of pine and spruce with an accuracy approaching 100%.
Detection and species discrimination using rDNA T-RFLP for identification of wood decay fungi
Authors: Råberg Ulrika , Högberg Nils O.S. , Land Carl Johan 
Published: November 2005

AbstractIn the present work PCR technology was used as a tool to detect the early stages of wood decay and was compared with microscopic evaluation. The wood decay fungiPostia placentaandConiophora puteanawere detectable in interior wood samples by terminal restriction fragment length polymorphism (T-RFLP) after 2weeks of incubation with monocultures, while microscopic detection of hyphae was not possible until after 7 weeks. A potential problem when fungal communities are studied with T-RFLPs of rDNA is that intra-specific variation complicates data analysis. In this work, we show that intra-specific sequence variation in the internal transcribed spacer of the rDNA inConiophora puteanaallows T-RFLP identification of this species. This is due to intra-specific variations in fragment length, in combination with the absence of point mutations in the selected restriction sites.
Extraction of silver from nitric acid medium by certain quinoline derivatives
Authors: Ali A. M. I. 
Published: November 2005

Summary
Three new quinoline derivatives were synthesised and characterized. These compounds were found to be insoluble in water and different acids such as HNO3, HCl until 6 M and soluble in NaOH at 2 M concentration. Chloroform was found to be the suitable solvent for quinoline derivatives. The extraction of Ag from nitric acid by 8-methyl-2,4-dithiol-quinoline (1H) (MDTQ), 4-chloro-8-methyl-quinoline (1H) thione (CMTQ) and 3-formyl-4-hydroxy N-methyl 2(H) quinoline (FHMQ) has been investigated.
The effects of shaking time, nitric acid concentration, metal ion concentration and the concentration of extractant were studied. The results showed that the distribution ratio of Ag decreased with increase in the nitric acid and metal concentration, and increased by increasing the extractant concentration. It was found that an equilibrium time of 10 min was required to reach equilibrium. The results showed that (MDTQ) is very selective for the separation of Ag.
Radiobromination of closo-dodecaborate anion. Aspects of labelling chemistry in aqueous solution using Chloramine-T
Authors: Tolmachev Vladimir , Bruskin A. , Sivaev Igor , Lundqvist Hans , Sjöberg Stefan 
Published: November 2005

Summary

Closo-dodecaborate dianion is a three-dimensional aromatic inorganic molecule, which can be easily halogenated forming a stable halogen-boron bond. Derivatives of closo-dodecaborate were considered as a convenient chemical form of delivery of enriched 10B to malignant tumors for boron neutron capture therapy (BNCT). Some properties of closo-dodecaborate (hydrophilicity, strength of halogen-boron bond, charge at lysosomal pH) make it attractive as a potential prosthetic group for attachment of radioactive halogens to tumor-targeting proteins. Bromine radioisotopes possess a variety of useful nuclear characteristics, and can be used in different areas of clinical diagnostics and therapy. In this work, a basic chemistry of closo-dodecaborate radiobromination was studied. It was found, that di(triethylamonium) dodecahydro-closo-dodecaborate can be labelled in high yield, more then 90%, in a wide pH range. By decreasing the pH, the bromination can be directed to closo-dodecaborate in the presence of phenolic compounds. The results of the study indicate a possibility of using the radioactive bromine label for investigation of pharmacokinetics of boronated compounds for BNCT.