Analysis of neonatal heart rate variability by a microprocessor-based on-line system

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Maternal stress or sleep during pregnancy are not reflected on telomere length of newborns

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Education For All: Approaches to Teacher Education for Inclusion: An Invited Policy Brief

Over the last thirty years, there has been an international aspiration to make education provision both inclusive and equitable with resultant policy production at both international and national level. Over time, the focus of this activity has moved from the specific needs of disabled students to consideration of how schools might celebrate diversity and provide effective learning for all students. Teacher education is viewed as a key factor in creating school environments where all young people have equity of access to relevant learning opportunities no matter their background or circumstances. This paper presents six case studies from Finland, New Zealand, Lithuania, Scotland, Norway and Canada charting the changes made over time to educational provision within their national context aiming to make schools more inclusive. Each case study highlights some of the ways in which teacher education has adapted in response to these policy changes to prepare new teachers to work in inclusive school settings. Common to all case studies is the identification that further research and change is required to meet the professional learning requirements of our future teachers. In response to this identified need. Highlighting the complex nature of providing inclusive education for all, it is suggested that future teacher education must continue to explore new ways to enhance the professional expertise of teachers to be inclusive of all learners in their daily practice

Antepartal analysis of fetal heart rate variability by abdominal electrocardiography

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Comparison of pin mill and hammer mill in the fine grinding of sphagnum moss

Abstract Dried sphagnum moss was ground using a pin mill and a hammer mill under various operating conditions, i.e., changes in the rotor frequency and feed rate. The specific energy consumption of the size reduction was recorded. The ground powder was characterized by median particle size, width of size distribution (span), loose and tapped bulk densities, and the Hausner ratio. Pin milling used less energy for size reduction than hammer milling, especially when the target size was below 100 μm. In both milling methods, the specific energy consumption was mainly caused by the rotor frequency used. However, in pin milling, the specific energy consumption was also dependent on the production rate: the higher the rate, the higher the energy consumption. No such dependence was observed with the hammer mill. The span was wider in pin milling than hammer milling in the intermediate product size range although the difference decreased at the fine and coarse ends. A similar pattern was found for bulk densities. However, the flowability of powder, as characterized by the Hausner ratio, was comparable between the grinding methods

Fractionation of thermomechanical pulp in pressure screening:an experimental study on the classification of fibres with slotted screen plates

Abstract Pressure screening, nowadays the most widely used method for cleaning pulp, has been traditionally investigated as a debris removal process. The aim of this thesis, however, was to study it with a view to the fractionation of pulps, examining systematically and extensively the effects of screening parameters on fractionation under actual working conditions in order to provide an insight into its possibilities and limitations as a fractionation method. The experimental work was performed with a full-scale two-stage pressure screen connected to an industrial TMP process. Fractionation of the pulp was analysed in terms of consistency, freeness, optical fibre length distribution, coarseness index and Bauer-McNett fractions. Two sampling systems were used during the screening experiments, manual and semiautomatic. The latter was assessed to be more reliable, as reflected in lower stochastic variation and the absence of a systematic bias in the mass balance errors over the screen. The poorer reliability of the manual sampling system was offset by the large number of screening tests, however. The results of the screening experiments showed that with a given design of the screen plate, the separation of each fraction was dependent almost exclusively on the mass and volumetric reject rates. The mass flow of fines, defined as the Bauer-McNett P200 fraction, was dependent mostly on the volumetric reject rate, while the mass flow of fibrous fractions (R200, R50, R30, R16) depended mostly on the mass reject rate. The mass reject rate obtained in pressure screening was a result of the choice of operating parameters, but fractionation efficiency could not be affected by using different combinations of these parameters (feed consistency, rotor tip speed and slot velocity) if the mass and volumetric reject rates were kept constant. The slot width together with the contouring of the screen plate affected the fractionation efficiency as compared with the situation at constant mass and volumetric reject rate. Increased fractionation was obtained by reducing the slot width and contouring. The pulp passage ratio, which combines the mass and volumetric reject rates into one parameter, was found to be a expedient way of expressing the fractionation of pulp, as it was possible to present fractionation uniformly as a function of this ratio. The change in freeness was found to correlate quite well with that in Bauer-McNett fractions, and it was a good indicator of fractionation efficiency in screening. Apart from fractionation according to length (or Bauer-McNett fractions), the slotted pressure screen was also found to classify the fibres according to their coarseness. The coarseness difference was partially dependent on the fibre length, but additionally the coarseness in the accept pulp for any given fibre length class was always lower than that in the reject pulp. The difference obtained seemed to depend on the passage ratio of the pulp. This thesis provides new information for the modelling of pulp quality and the design of fractionation experiments, fractionation processes and screen room control strategies

Sphagnum moss as a functional reinforcement agent in castor oil-based biopolyurethane composites

Abstract (1) Sphagnum mosses are an abundant source of structural molecules, similar to lignocelluloses in rooted plants, having properties advantageous in biopolyurethane composites: their hydrophobicity when dry facilitates dispersion into biopolyols; hydroxyl groups provide cross-linking with the polyurethane (PU) matrix; and easy grindability enables small particle size, down to 10 μm with low energy consumption and a large interface for isocyanate to react with. (2) The present study introduces a novel use of Sphagnum moss as a reinforcement filler incorporated into castor oil. Two moss grades, a slightly and a moderately humified moss (having hydroxyl, equivalent to KOH, of 255 and 359 mg g⁻¹, respectively), were pulverised and dispersed into castor oil (KOH equivalent 160mg g⁻¹) in mass proportions of 0–28 %. Mixtures were reacted with polymeric diphenylmethane diisocyanate to produce reinforced biopolyurethane (bioPU) composites. (3) The mechanical properties tested according to ISO 527 improved similarly with both fillers. With increasing filler content, tensile strength increased monotonically up to 450 % and Young’s modulus up to 350 % while the strain at break point (at around 90 %) remained almost unchanged over the whole range of filler contents. The shift of the ‘′tan delta′ peak’ (energy damping coefficient during deformation) toward higher temperatures with increasing filler content indicated strong cross-linking between the filler and the PU matrix, while the width of the peaks was narrow and remained virtually unchanged showing the filler to be homogeneously dispersed within the matrix. (4) Overall, Sphagnum filler may provide a straightforward and cost-effective reinforcement for (bio)polyurethanes

Pine sawdust modification using Fenton oxidation for enhanced production of high-yield lignin-containing microfibrillated cellulose

Abstract Sawdust is an abundant high-quality residue from sawmills, representing 20–30 % of sawn products by volume. In this study, the chemical pre-treatment of pine sawdust with Fenton’s reagent, formed from hydrogen peroxide and iron catalyst under moderately acidic conditions, was found to intensify the microfibrillation process in terms of energy consumption and improve the grade of the high-yield lignin-containing microfibrillated cellulose (LMFC) produced. With a minor yield loss of 5.5 wt.%, Fenton pre-treatment increased the microfibrillation rate and bonding potential of LMFC, indicating that the ultrastructure of the lignocellulose cell walls had been modified. Linear dependency between the growth of specific surface area and energy consumption was seen, i.e. microfibrillation followed Rittinger’s law of comminution. In comparison with the reference without any pretreatment,the total grinding energy consumption to a particle size of 14 µm was about 30 % lower (10.7 vs. 15 MWh/t) while the tensile strength and stiffness of LMFC films were 50 % (100 vs. 66 MPa) and 35 % higher (6.6 vs. 4.9 GPa), respectively. The advantageous effects of Fenton chemistry were assumed to originate from the cleavage of lignin-carbohydrate bonds, mainly between lignin and hemicelluloses. This phenomenon was supported by the substantially increased solubility of polysaccharides in dilute alkali. The calculated manufacturing costs of LMFCs (using the above-mentioned specifications) was € 850/t, of which the raw material, chemical and electricity costs accounted for 10 %, 2 % and 88 %, respectively. Without any chemical pre-treatment, manufacturing costs were € 1100/t of which raw material accounted for 7 % and electricity 93 %

Energy consumption, physical properties and reinforcing ability of microfibrillated cellulose with high lignin content made from non-delignified spruce and pine sawdust

Abstract The production of MFC and CNF has recently been focused on fiber raw materials which, still contain residual lignin instead of bleached chemical pulp fibers. The target of this study was to assess the energy consumption and microfibrillation rate for high lignin containing microfibrillated cellulose (LMFC) produced from non-delignified pine and spruce sawdust directly or after lignin-preserving sulfonation, and evaluate their grade by measuring strength properties of self-standing films made from the LMFCs and by determining their ability to reinforce fluting board. MFC from bleached softwood was used as a reference. Microfibrillation rate at 80 °C was faster for spruce sawdust than for pine sawdust, i.e., bonding ability (measured as tensile strength of self-standing films) developed faster in spruce LMFC than in pine LMFC. By mild pre-sulfonation of sawdust, corresponding to the sulfonation degree of 0.5−0.6 %, the rate increased further with both softwood species. In similar grinding conditions and equal grinding time, pre-sulfonation did not affect much energy consumption but at a given specific energy consumption the grade of LMFC was better. Due to the high lignin content, mechanical properties of LMFCs could not been developed at as high level than MFC. However, the tensile strength of 100 MPa was possible to achieve for LMFC films using either the equivalent (spruce and sulfonated pine) or even clearly lower amount (sulfonated spruce) of grinding energy than in microfibrillation of bleached Kraft pulp to the same strength. By comparing the pre-sulfonation of sawdust and the post-sulfonation of LMFC, it was concluded that the main sulfonation effect in grinding was lignin softening, which enhanced cell wall disintegration in microfibrillation. The increased bonding ability of sulfonated lignin and the dissolution of extractives were seen to be secondary effects but not without significance. Pre-sulfonation also improved redispersibility, i.e., the recovery of the mechanical properties of dried LMFCs. The reinforcing potential was evaluated by dosing LMFCs and MFC without a retention aid into the handsheets made from fluting pulp. The tensile strength of fluting increased almost linearly with an increasing dosage and increasing microfibrillation time. Although the grade of LMFCs, in terms of viscosity and mechanical properties of LMFC films, was lower than that of MFC from bleached softwood, their ability to reinforce fluting board was shown to be equal, indicating lignin present did not interfere the formation of hydrogen bonds. With a 4 % dosage (equaling to the amount of 2–2.5 % within the handsheets) of each LMFC microfibrillated for 120 min, the tensile strength improved by 20 %. Among the tested raw materials, LMFC from spruce sawdust without pre-sulfonation has the greatest potential as a cost-effective reinforcing agent for the paper and board industry. For sulfonated LMFCs should be found applications where their better bonding ability could be better utilized