A ‘One Pot’ Synthesis of Acenaphtho[1,2-b]Benzo[f] and Acenaphtho[1,2-b]Benzo[h]Quinolines

A short, simple and high yielding ‘one pot’ synthesis of two acenaptho[1,2-b]benzo-quinolines have been described which involved highly regioselective thermal cyclization of enaminoimine hydrochlorides from 2-chloro-1-formylacenaphthylene and ½-naphthylamine.     

Coordinating Numeric and Linear Units: Elementary Students’ Strategies for Locating Whole Numbers on the Number Line

Two investigations of fifth graders’ strategies for locating whole numbers on number lines revealed patterns in students’ coordination of numeric and linear units. In Study 1, we investigated the effects of context on students’ placements of three numbers on an open number line. For one group (n?=?24), the line was presented in a thematic context as a “race course,” and, for a second group (n?=?24), the line was presented as a conventional number line. Most students in both groups placed consecutive whole numbers at appropriate linear distances, but the thematic context group was more likely to place nonconsecutive whole numbers at appropriate linear distances. In Study 2 (n?=?24), students placed numbers on lines marked with two numbers. Most students placed a third number appropriately when the marked numbers were consecutive whole numbers, but not when the labeled numbers were nonconsecutive whole numbers. The findings reveal fifth graders’ conceptual difficulties in coordinating numeric and linear units on the number line and a thematic context that can support this coordination.     

Electrical and photovoltaic characterisations of methyl red dye doped solid-state photoelectrochemical cell

In this work, we have reported the electrical and photovoltaic properties of methyl red dye sensitised photoelectrochemical cell. Here, we have explored the possibility of using methyl red dye in photovoltaic devices. The dye was dispersed in polyvinyl alcohol used as an inert polymer binder and polyethylene oxide complexed with lithium perchlorate ion salt as a solid electrolyte. Ethylene carbonate and propylene carbonate are used as plasticisers. A thin film of this blend is sandwiched between two electrodes, one of which is indium tin oxide coated glass plate and another is aluminium. The active area of the cell is 0.04 cm². By analysing dark I–V characteristics, trap energy is estimated in the order of 0.053 eV. The photovoltaic parameters such as open circuit voltage, short circuit current, fill factor and power conversion efficiency of the cell have been calculated to be 368 mV, 410 nA, 0.349 and 1.24%, respectively. The photovoltaic currents were measured with different intensity.     

Thermodynamic variables of first-order entropy corrected Lovelock-AdS black holes: $$P{-}V$$ criticality analysis

We investigate the effect of thermal fluctuations on the thermodynamics of a Lovelock-AdS black hole. Taking the first order logarithmic correction term in entropy we analyze the thermodynamic potentials like Helmholtz free energy, enthalpy and Gibbs free energy. We find that all the thermodynamic potentials are decreasing functions of correction coefficient \(\alpha \). We also examined this correction coefficient must be positive by analysing \(P{-}V\) diagram. Further we study the \(P{-}V\) criticality and stability and find that presence of logarithmic correction in it is necessary to have critical points and stable phases. When \(P{-}V\) criticality appears, we calculate the critical volume \(V_c\), critical pressure \(P_c\) and critical temperature \(T_c\) using different equations and show that there is no critical point for this black hole without thermal fluctuations. We also study the geometrothermodynamics of this kind of black holes. The Ricci scalar of the Ruppeiner metric is graphically analysed.     

NaBH4-InCl3-mediated one-pot chemo- and stereoselective decarboxylative reduction of alpha-aza gem-dicarboxylic esters to monoalcohols

[reaction: see text] The combination of NaBH4 and a catalytic amount of InCl3 provides a one-pot method for chemo- and stereoselective decarboxylative reduction of gem-dicarboxylic esters 1 to monoalcohols 2 in the presence of the lactam carbonyl in refluxing acetonitrile under inert atmosphere.     

Determination of silicon,phosphorus and sulfur in alloy steel by neutron activation analysis

Silicon, phosphorus, and sulfur in alloy steel were determined by neutron activation analysis involving rapid radiochemical separation procedures. The standard deviations for silicon, phosphorus, and sulfur were 1.6%, 2.3%, and 2.4% respectively; the sensitivity limits were 3.2, 0.20, and 2.50 p.p.m., respectively. The three constituents could be determined in alloy steel within 2 h of the irradiation.     

Neutron activation analysis of Bawachi seeds

Seeds of (the plant) P. Corylifolia Linn (Bawachi) known for their therepeutic value in indigenous medicine have been analysed for Cu, As, Sb and Se by thermal neutron activation analysis involving substoichiometric extraction and precipitation technique. The amounts of Cu, As, Sb and Se per gram of seeds dried at 80°C are 16.0±1.1 μg, 0.90±0.4 μg, 12.1±0.6 μg and 4.0±0.2 μg respectively.     

Synthesis of novel cationic lipids with fully or partially non-scissile linkages between the hydrocarbon chains and pseudoglyceryl backbone

Five novel cationic lipids with fully or partiallynon-scissile linkage regions between the pseudoglyceryl backbone and the hydrocarbon chains have been synthesized. The membrane-forming properties of these new lipids are briefly presented.     

Solvent extraction of Cd(II) with isonitrosothiocamphor

The extraction coefficient of cadmium into 1,2-dichlorobenzene using isonitrosothiocamphor (HINTC) as a chelating agent at pH 8.5 is greater than 4585. It remains constant in the pH range of 7 to 10. The nature of the extracted species is ML₂ as derived by the slope ratio method. A careful analysis of the effect of different groups on the extraction coefficient and separation factors of a number of ions against Cd(II) has been carried out. The separation factors for most of the elements is characteristically high.