Molecular mass distribution of dextran in Brazilian sugar and insoluble deposits of cachaca

The dextran molecular mass distribution profile in 77 sugar samples from Brazil and twelve insoluble deposits (alcoholic flocks) samples from sugared cachacas (Brazilian sugar cane spirit) is described in terms of number-average molecular mass M,,, weight-average molecular mass M(w), Z-average molecular mass M,, and polydispersity. The analyses were performed by size-exclusion chromatography, using a refractive index detector. In most of the sugar samples, it was possible to identify two major groups of dextrans with Mw averages of 5 x 10(6) and 5 x 10(4) Da. Based on the evaluated parameters, the dextran distribution profile is about the same in samples analyzed over five seasons, and, therefore, it is likely that the Brazilian product pattern will not change very much over the years. In insoluble deposits from sugared cachacas, dextrans with Mw values in the order of the 10(5) Da were the most frequent ones, being present in 58% of the samples. (c) 2008 Elsevier Ltd. All rights reserved.

TiO(2)-PHOTOCATALYZED DEGRADATION OF PHENOL IN SALINE MEDIA IN AN ANNULAR REACTOR: HYDRODYNAMICS, LUMPED KINETICS, INTERMEDIATES, AND ACUTE TOXICITY

The photocatalytic degradation of phenol in aqueous suspensions of TiO(2) under different salt concentrations in an annular reactor has been investigated. In all cases, complete removal of phenol and mineralization degrees above 90% were achieved. The reactor operational parameters were optimized and its hydrodynamics characterized in order to couple mass balance equations with kinetic ones. The photodegradation of the organics followed a Langmuir-Hinshelwood-Hougen- Watson lumped kinetics. From GC/MS analyses, several intermediates formed during oxidation have been identified. The main ones were catechol, hydroquinone, and 3-phenyl-2-propenal, in this order. The formation of negligible concentrations of 4-chlorophenol was observed only in high salinity medium. Acute toxicity was determined by using Artemia sp. as the test organism, which indicated that intermediate products were all less toxic than phenol and a significant abatement of the overall toxicity was accomplished, regardless of the salt concentration.

Removal of Zn(2+) from Electroplating Wastewater Using Modified Wood Sawdust and Sugarcane Bagasse

This paper describes the preparation of new adsorbents derived from sugarcane bagasse and wood sawdust (Manilkara sp.) to remove zinc (II) ions from electroplating wastewater. The first part deals with the chemical modification of sugarcane bagasse and wood sawdust, using succinic anhydride to introduce carboxylic acid functions into the material. The obtained materials (modified sugarcane bagasse MB2 and modified wood sawdust MS2) were then characterized by infrared spectroscopy (IR) and used in adsorption experiments. The adsorption experiments evaluates Zn(2+) removal from aqueous single metal solution and real electroplating wastewater on both batch and continuous experiments using fixed-bed columns prepared in laboratorial scale with the obtained adsorbents. Adsorption isotherms were then developed using Langmuir model and the Thomas kinetic model. The calculated Zn(2+) adsorption capacities were found to be 145 mg/g for MS2 and 125 mg/g for MB2 in single metal aqueous solution, whereas for the industrial wastewater these values were 61 mg/g for MS2 and 55 mg/g for MB2.

Riskfaktorer för och omvårdnadsåtgärder vid akut delirium : En litteraturstudie

Syftet med litteraturstudien var att beskriva vilka faktorer som i omvårdnadsforskningen beskrivs som bidragande faktorer till akut delirium. Syftet var vidare att beskriva vilka omvårdnadsåtgärder som omvårdnadsforskningen tar upp som kan minska risken för uppkomst av akut delirium. Resultatet baserades på vetenskapliga artiklar som söktes i följande databaser: Elin@dalarna, BlackwellSynergy, PubMed och EBSCO host. Följande sökord användes: delirium, acute, elderly, nursing, patients, caring, management, confusional state, needs. Artiklarna granskades enligt en granskningsmall med avseende på vetenskaplig kvalité. Betydande riskfaktorer för akut delirium var ålder, flera samtidiga sjukdomar, antalet mediciner och typ av medicin. Förutom att genomgå operation var också många åtgärder, framför allt invasiva åtgärder, tidigt under sjukhusvistelsen riskfaktorer för akut delirium. Även flera rumsbyten var en riskfaktor. Viktiga åtgärder för att förebygga akut delirium var psykiatrisk konsultation, tekniker för att underlätta orientering, emotionellt stöd, patientundervisning och anhörigundervisning, patientorientering, fysisk kontakt med patient samt att upprätta kontakt med kurator.

Orsa skoltidning, nationell skolutveckling på lokal nivå

Syftet med uppsatsen är att ta reda på hur avgörande nationella skolreformer mottagits och anammats på lokal nivå från år 1931 fram till och med läroplanen 1962. Undersökningen riktar in sig på den skoltidning som utgavs i Orsa, i norra Dalarna, under perioden 1931 och 1985. De teoretiska utgångspunkterna har i huvudsak hämtats från Tomas Englunds avhandling Samhällsorientering och medborgarfostran i svensk skola under 1900-talet. I uppsatsen ställs frågor om hur den skolpolitiska, de didaktiska och den pedagogiska utvecklingen, såsom den ter sig i Orsa skoltidning, stämmer överens med den motsvarande nationell utveckling och vilka pedagogiska och didaktiska åtgärder och konsekvenser reformerna fått på den lokala nivån. Resultatet visar på en stor grad av acceptans och anpassning hos lokalbefolkningen, men också motstånd och lokal självkänsla. Många gånger också en ambivalent längtan efter att både vilja omfamna de nya idéerna och samtidigt behålla de traditionella värdena.Genom att systematisk söka igenom valda återkommande inslag i skoltidningen har jag försökt skapa en bild av denna utveckling. Jag har också slutligen placerat uppsatsens resultat i ljuset av den rådande vetenskapliga debatten kring skolans didaktiska utveckling. Det råder olika uppfattningar om hur stort inflytande de politiska reformerna egentligen hade på skolans inre utveckling. Denna uppsats bidrar i detta avseende med en inblick i huruvida just Orsa skoltidning verkar ha agerat styrt eller autonomt i skolpolitiska, didaktiska och pedagogiska frågor.

Utvärdering av digitala provtryckssystem

Six different Digital Proofing Systems from three different techniques have been evaluated as totechnique, printing quality, economy and usability. Digital proof from two paper qualities, coatedand uncoated, has been compared with references printed in offset, to see how good they match eachother. Only two Proofing Systems manage to print on reference paper. The other Proofing Systemsuse special paper for digital proof.Measurements and visuell judgement show that the Digital Proofing Systems visualise referencepictures with quite good quality. Proof optimised for coated paper visualise the colours with goodresult. Proof optimised for uncoated paper shows higher quality than the references, which depends onthe surface of the proofing paper. Comparison between reference paper and proofing paper has takenplace as to differences in colour and paper quality.The Digital Proofing Systems are fully automatic, which demand a quite comprised education forcorrect handling. The purchase price and printing costs vary considerably between the ProofingSystems.

Heat losses and thermal performance of commercial combined solar and pellet heating systems

Various pellet heating systems are marketed in Sweden, some of them in combination with a solar heating system. Several types of pellet heating units are available and can be used for a combined system. This article compares four typical combined solar and pellet heating systems: System 1 and 2 two with a pellet stove, system 3 with a store integrated pellet burner and system 4 with a pellet boiler. The lower efficiency of pellet heaters compared to oil or gas heaters increases the primary energy demand. Consequently heat losses of the various systems have been studied. The systems have been modeled in TRNSYS and simulated with parameters identified from measurements. For almost all systems the flue gas losses are the main heat losses except for system 3 where store heat losses prevail. Relevant are also the heat losses of the burner and the boiler to the ambient. Significant leakage losses are noticed for system 3 and 4. For buildings with an open internal design system 1 is the most efficient solution. Other buildings should preferably apply system 3. The right choice of the system depends also on whether the heater is placed inside or outside of the heated are. A large potential for system optimization exist for all studied systems, which when applied could alter the relative merits of the different system types.

Variation of System Performance with Design and Climate for Combisystems in Sweden

In Sweden, 90% of the solar heating systems are solar domestic hot water and heating systems (SDHW&H), so called combisystems. These generally supply most of the domestic hot water needs during the summer and have enough capacity to supply some energy to the heating system during spring and autumn. This paper describes a standard Swedish combisystem and how the output from it varies with heating load, climate within Sweden, and how it can be increased with improved system design. A base case is defined using the standard combi- system, a modern Swedish single family house and the climate of Stockholm. Using the simulation program Trnsys, parametric studies have been performed on the base case and improved system designs. The solar fraction could be increased from 17.1% for the base case to 22.6% for the best system design, given the same system size, collector type and load. A short analysis of the costs of changed system design is given, showing that payback times for additional investment are from 5-8 years. Measurements on system components in the laboratory have been used to verify the simulation models used. More work is being carried out in order to find even better system designs, and further improvements in system performance are expected.

Design method for solar heating systems in combination with pellet boilers/stoves

In this study an optimization method for the design of combined solar and pellet heating systems is presented and evaluated. The paper describes the steps of the method by applying it for an example of system. The objective of the optimization was to find the design parameters that give the lowest auxiliary energy (pellet fuel + auxiliary electricity) and carbon monoxide (CO) emissions for a system with a typical load, a single family house in Sweden. Weighting factors have been used for the auxiliary energy use and CO emissions to give a combined target function. Different weighting factors were tested. The results show that extreme weighting factors lead to their own minima. However, it was possible to find factors that ensure low values for both auxiliary energy and CO emissions.