Photocatalytic degradation of phenol by base metal-substituted orthovanadates

Base metal (Cr, Mn, Fe, Ni, Cu) substituted CeVO4 compounds were synthesized by the solution combustion technique. These compounds were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis spectroscopy, transmission electron microscopy and BET surface area analyzer. The characterization indicated that the base metals were substituted in the ionic state in all the compounds. These compounds were used for the photocatalytic degradation of phenol and the degradation rates obtained in the presence of these compounds werecompared against that obtained with the commercial Degussa P-25 TiO2 catalyst. Fe and Cr substituted CeVO4 showed photocatalytic activity that was comparable with that of Degussa P-25 TiO2. The concentration of toxic intermediates was high when the reaction was carried out in presence of Degussa P-25 TiO2 but it was found to be insignificant when the reaction was carried out in presence of base metal-substituted CeVO4. The effect of % Fe-substitution (varied from 1 to 5 at%) in CeVO4 on the photocatalytic activity was also investigated and it was observed that 1 at% Fe-substituted compound showed the highest activity. A mathematical model describing the kinetics of the photocatalytic degradation of phenol was developed on the basis of the catalyst structure and taking into account the formation of all the possible intermediates. The variation of the concentration of phenol and the intermediates was described by the model and the reaction rateconstants were determined. (C) 2010 Elsevier B.V. All rights reserved.

PROMIDS: A PROtotype multi-rIng data flow system for functional programming languages

This paper presents a detailed description of the hardware design and implementation of PROMIDS: a PROtotype Multi-rIng Data flow System for functional programming languages. The hardware constraints and the design trade-offs are discussed. The design of the functional units is described in detail. Finally, we report our experience with PROMIDS.

Design of temperature-compensated reference electrodes for non-isothermal galvanic sensors

The criterion for the design of a temperature-compensated reference electrode for non-isothermal galvanic sensors is deduced from the basic flux equations of irreversible thermodynamics. It is shown that when the Seebeck coefficient of the non-isothermal cell using a solid oxygen ion-conducting electrolyte under pure oxygen is equal to the relative partial molar entropy of oxygen in the reference electrode divided by 4F, then the EMF of the non-isothermal cell is the same as that of an isothermal cell with the same electrodes operating at the higher temperature. By measuring the temperature of the melt alone and the EMF of the non-isothermal galvanic sensor, one can derive the chemical potential or the concentration of oxygen in a corrosive medium. The theory is experimentally checked using sensors for oxygen in liquid copper constructed with various metal+oxide electrodes and fully stabilised (CaO)ZrO2 as the electrolyte. To satisfy the exact condition for temperature compensation it is often necessary to have the metal or oxide as a solid solution in the reference electrode.

Study of magnetic field effect on the specific heat and entropy in DyBa2Cu3O7-x

The change in the specific heat by the application of magnetic field up to 161 for high temperature superconductor system for DyBa2Cu3O7-x by Revaz et al. [23] is examined through the phenomenological Ginzburg-Landau(G-L) theory of anisotropic Type-II superconductors. The observed specific heat anomaly near T-c with magnetic field is explained qualitatively through the expression <Delta C > = (B-a/T-c) t/(1 - t)(alpha Theta(gamma)lambda(2)(m)(0)), which is the anisotropic formulation of the G-L theory in the London limit developed by Kogan and coworkers; relating to the change in specific heat Delta C for the variation of applied magnetic field for different orientations with c-axis. The analysis of this equation explains satisfactorily the specific heat anomaly near T-c and determines the anisotropic ratio gamma as 5.608, which is close to the experimental value 5.3 +/- 0.5given in the paper of Revaz et al. for this system. (C) 2010 Elsevier B.V. All rights reserved.

Maailmankuvan uskonnollisuus ja arvot moraaliarviointien selittäjinä

Moraalipsykologit ovat väitelleet vuosikymmeniä siitä, mitä moraali on ja minkälaisiin psykologisiin prosesseihin moraaliarvioinnit perustuvat. Yksi keskeinen kysymys on koskenut sitä vaikuttavatko ihmisten maailmankuvat ja niihin kietoutuvat tiedolliset uskomukset, arvot ja omat käsitykset moraalin luonteesta moraaliarviointeihin. Tämä tutkimus lähti selvittämään maailmankuvan uskonnollisuuden sekä arvojen yhteyttä moraaliarviointeihin tilastollisten analyysien valossa. Kyselytutkimusaineisto kerättiin helsinkiläisiltä yliopisto-opiskelijoilta (N = 161). Nykypäivän ihmisille tuttujen, mutta moraalisesti kiistanalaisten tekojen vääryyden arvioinneista muodostettiin pääkomponenttianalyysiin perustuen kolme tekotyyppiä, jotka nimettiin itseen kohdistuviksi teoiksi (ITSE-teot; abortti, avioero, eutanasia, seksin harrastaminen alaikäisenä ja itsemurha), muihin yksilöihin kohdistuviksi antisosiaalisiksi teoiksi (MYKS-teot; varastetun tavaran ostaminen tietoisesti, pysäköidylle autolle vahingossa aiheuttamansa vahingon ilmoittamatta jättäminen ja toiselle henkilölle kuuluvan auton luvaton käyttöönotto) sekä yhteiskuntaan kohdistuviksi antisosiaalisiksi teoiksi (YHT-teot; maksamatta jättäminen julkisessa liikenteessä ja verovilppi tilaisuuden salliessa). Maailmankuvaltaan perinteisesti uskonnolliset henkilöt arvioivat kaikki tekotyypit lähes yhtä vääriksi (sanallisesti ”väärin” oleviksi) sekä keskimäärin vääremmiksi kuin maailmankuvaltaan ei-perinteisesti uskonnolliset henkilöt. Sen sijaan ei-perinteisesti uskonnolliset henkilöt erottivat selkeästi kaikki kolme tekotyyppiä niin keskiarvojen kuin niiden sanallisten vastineidensakin mukaan (väärimmiksi arviointiin MYKS-teot ja vähiten vääriksi ITSE-teot). Hierarkkisissa regressioanalyyseissä maailmankuvan uskonnollisuuden perinteisyys ennusti merkittävästi ITSE-tekojen vääremmäksi arviointia, mutta kohtalaisesti myös YHT-tekojen vääremmäksi arviointia, kun ikä, sukupuoli ja arvoulottuvuudet oli vakioitu. Uskonnollisuuden perinteisyys ei kuitenkaan ennustanut MYKS-tekojen arviointia muut tekijät vakioituina ja sen ainoaksi tilastollisesti merkitseväksi selittäjäksi osoittautui säilyttämis−muutosvalmiusarvoulottuvuus, joskin melko vähäisellä selitysvoimalla. Kyseinen arvoulottuvuus ennusti myös ITSE- ja YHT-tekotyyppien arviointeja muut edellä mainitut tekijät vakioituina, mutta heikommin kuin maailmankuvan uskonnollisuuden perinteisyys. YHT-tekoja selitti lisäksi ikä, kun kaikki muut selittäjät oli vakioitu. Itsensäylittämis–itsensäkorostamisarvoulottuvuus ei ollut yhteydessä yhdenkään tekotyypin vääryyden arviointiin. Tulokset tukivat aiempia tutkimustuloksia siitä, että eri ihmiset hahmottavat ainakin omasta näkökulmastaan moraalin alaa eri tavoin eli arvioivat samat teot eri tavoin vääriksi tai vapaaehtoisiksi. Tulokset osoittivat myös, että ihmisten maailmankuvan uskonnollisuudella ja säilyttämisarvojen preferoinnilla on selkeä yhteys näihin eroihin arvioinneissa, mutta että muihin yksilöihin kohdistuvat vahingolliset ja epäoikeudenmukaiset antisosiaaliset teot tuomitaan hyvin yleisesti väärinä. Yhdessä nämä tekijät näyttäisivät viittaavan siihen, että ihmisten moraalikäsitykset todella vaihtelevat. Keskeisinä lähteinä toimivat Jonathan Haidtin, Lawrence Kohlbergin, Shalom Schwartzin, Richard Shwederin sekä Elliot Turielin tieteelliset julkaisut ja teokset.

Evolution of polyandry by reduction in progeny number variance in structured populations

When there is a variation in the quality of males in a population, multiple mating can lead to an increase in the genetic fitness of a female by reducing the variance of the progeny number. The extent of selective advantage obtainable by this process is investigated for a population subdivided into structured demes. It is seen that for a wide range of model parameters (deme size, distribution of male quality, local resource level), multiple mating leads to a considerable increase in the fitness. Frequency-dependent selection or a stable coexistence between polyandry and monandry can also result when the possible costs involved in multiple mating are taken into account.

Laser Surface Alloying of a Creep Resistant Magnesium Alloy MRI 230D with Al and Al2O3

A creep resistant permanent mould cast Mg alloy MRI 230D was laser surface alloyed with Al and a mixture of Al and Al2O3 using pulsed Nd:YAG laser irradiation at four different scan speeds in order to improve the corrosion and wear resistance. The microstructure, corrosion and wear behavior of the laser surface alloyed material is reported in this manuscript. The coating comprised of a featureless microstructure with cellular-dendritic microstructure near the interface and exhibited good interfacial bonding. A few solidification cracks reaching down to substrate were also observed. The two step coating with Al followed by a mixture of Al and Al2O3 exhibited a slightly better corrosion resistance than the single step coating with Al. In the long run, however, corrosion resistance of both the coatings became comparable to the as-cast alloy. The corroded surface of the laser surface alloyed specimens revealed a highly localized corrosion. The laser surface alloyed specimens exhibited an improvement in wear resistance. The laser scan speed did not exhibit a monotonic trend either in corrosion or wear resistance.

An integer arithmetic method to compute generalized matrix inverse and solve linear equations exactly

An algorithm that uses integer arithmetic is suggested. It transforms anm ×n matrix to a diagonal form (of the structure of Smith Normal Form). Then it computes a reflexive generalized inverse of the matrix exactly and hence solves a system of linear equations error-free.

Structure-Reactivity Correlations of Benzoin Alkyl Ethers. Structures of 2-Methoxy-1,2-diphenylethanone (I) and 2-Isopropoxy-1,2-diphenylethanone (II)

(I): C15H1402, Mr---226.27, triclinic, Pi,a=8.441 (2), b= 10.276 (1), c= 15.342 (2)A, a=91.02 (2), ~ t= 79.26 (2), y= 105.88 (2) °, V=1256.8 (4)A 3, Z=4, D,,= 1.209 (flotation in KI),D x - 1.195 g cm -3, #(Mo, 2 = 0.7107/~) = 0.44 cm -~,F(000) = 480, T= 293 K, R -- 0.060 for 1793 significant reflections. (II): C~THlsO2, Mr= 254.83, orthorhombic, Pca21, a=8.476 (1); b= 16.098 (3), c=10.802(3)A, V=1473.9 (5) A s, Z=4, Dm=1.161 (flotation in KI), Dx= 1.148gem -3, /~(Mo, 2=0.7107 A) =0.41 cm -~, F(000) = 544, T= 293 K, R = 0.071 for 867 significant reflections. Both (I) and (II) crystallize in a cisoid conformation for the carbonyl group and alkoxy groups. Compounds (I) and (II) are photostable on irradiation in the solid state in spite of the favourable conformation of the functional groups for intramolecular H abstraction. Absence of photoreaction of (I)and (II) in the solid state is rationalized in the light of unfavourable intramolecular geometry.

A Triggering Mechanism for Enhanced Star-Formation in Colliding Galaxies

We propose a physical mechanism to explain the origin of the intense burst of massive-star formation seen in colliding/merging, gas-rich, field spiral galaxies. We explicitly take account of the different parameters for the two main mass components, H-2 and H I, of the interstellar medium within a galaxy and follow their consequent different evolution during a collision between two galaxies. We also note that, in a typical spiral galaxy-like our galaxy, the Giant Molecular Clouds (GMCs) are in a near-virial equilibrium and form the current sites of massive-star formation, but have a low star formation rate. We show that this star formation rate is increased following a collision between galaxies. During a typical collision between two field spiral galaxies, the H I clouds from the two galaxies undergo collisions at a relative velocity of approximately 300 km s-1. However, the GMCs, with their smaller volume filling factor, do not collide. The collisions among the H I clouds from the two galaxies lead to the formation of a hot, ionized, high-pressure remnant gas. The over-pressure due to this hot gas causes a radiative shock compression of the outer layers of a preexisting GMC in the overlapping wedge region. This makes these layers gravitationally unstable, thus triggering a burst of massive-star formation in the initially barely stable GMCs.The resulting value of the typical IR luminosity from the young, massive stars from a pair of colliding galaxies is estimated to be approximately 2 x 10(11) L., in agreement with the observed values. In our model, the massive-star formation occurs in situ in the overlapping regions of a pair of colliding galaxies. We can thus explain the origin of enhanced star formation over an extended, central area approximately several kiloparsecs in size, as seen in typical colliding galaxies, and also the origin of starbursts in extranuclear regions of disk overlap as seen in Arp 299 (NGC 3690/IC 694) and in Arp 244 (NGC 4038/39). Whether the IR emission from the central region or that from the surrounding extranuclear galactic disk dominates depends on the geometry and the epoch of the collision and on the initial radial gas distribution in the two galaxies. In general, the central starburst would be stronger than that in the disks, due to the higher preexisting gas densities in the central region. The burst of star formation is expected to last over a galactic gas disk crossing time approximately 4 x 10(7) yr. We can also explain the simultaneous existence of nearly normal CO galaxy luminosities and shocked H-2 gas, as seen in colliding field galaxies.This is a minimal model, in that the only necessary condition for it to work is that there should be a sufficient overlap between the spatial gas distributions of the colliding galaxy pair.

Quantitative and compositional changes in myelin of undernourished and protein malnourished rat brains

Effects of undernutrition and protein malnutrition on the quantitative and qualitative changes in myelin isolated from rat brain at 3 and 8 weeks of age were investigated. Undernutrition during suckling period was induced by increasing the litter size, and continued from the 3rd to the 8th week by limited food intake, or the rats were rehabilitated with adequate food. Protein malnutrition was induced by feeding the lactating dams 5% protein diet as against 25% protein diet in controls. The protein malnourished rats were rehabilitated from the 3rd to the 8th week with the normal 25% protein diet. Undernutrition produced 16% and 35% reductions in the myelin content at 3 and 8 weeks of age, respectively, and was only partially restored on rehabilitation. Protein malnutrition caused more drastic reduction of 27% in the myelin content at 3 weeks, which was also partially restored on rehabilitation. The specific activity of 2′,3′-cyclic nucleotide 3′-phosphohydrolase was not affected by undernutrition, whereas protein malnutrition caused a 25% reduction at 3 weeks, which was totally reversed by rehabilitation. Undernutrition had not altered the relative composition of myelin proteins, but protein malnutrition resulted in a significant reduction in the proteolipid protein at 3 weeks of age, which could be reversed by rehabilitation.