Quasi-potential gas flow in nuclear-pumped flowing-gas laser cells

The influence of the boundary conditions on the two-dimensional gas velocity distribution in nuclear-pumped flowing-gas laser cells is considered for low energy deposits. It is demonstrated that, for any boundary conditions, the two-dimensional flow separates into two quasi-one-dimensional components and the size of the area of influence of the boundary conditions is comparable to the laser cell width.     

Activated carbon from coconut leaves for electrical double-layer capacitor

This study investigates the potential of coconut leaves as a precursor to obtain activated carbon. Coconut leaf-activated carbon (CLAC) has been prepared through gas activation process starting with carbonization at 400 °C in nitrogen flow for 3 h. The carbonized coconut leaves were milled using planetary ball milling followed by activation with carbon dioxide (CO₂) at different temperatures ranging from 700 to 1000 °C. The Brunauer–Emmett–Teller (BET) characterization reveals that the surface area of CLACs increases with the increase in activation temperature. Electrodes prepared from CLACs have been used to fabricate electrochemical double-layer capacitors (EDLCs) in order to study the electrochemical behavior using galvanostatic charge–discharge measurements and cyclic voltammetry. The carbon activated at 900 °C delivered the best specific capacitance of 133.4 F/g at current density of 200 mA/g.     

The complexation of anions by chloro- and cyanoacetanilides; IR, 1H-NMR and computation study

Complexation ability of simple chloro- and cyanoacetanilides has been determined using IR as well as ¹H-NMR titration experiments. Only 1:1 anion–amide complex stoichiometry has been found. The structures of several free anilides and their complexes with bromide anion have been studied by DFT calculation.     

Existence, uniqueness and stability of Cm solutions of iterative functional equations

In this paper we discuss a relatively general kind of iterative functional equation G(x,f(x),..., fn(x))=0 (for all x∈J), where J is a connected closed subset of the real number axis R, G∈Cm(Jn+1, R), and n≥2. Using the method of approximating fixed points by small shift of maps, choosing suitable metrics on functional spaces and finding a relation between uniqueness and stability of fixed points of maps of general spaces, we prove the existence, uniqueness and stability of Cm solutions of the above equation for any integer m≥0 under relatively weak conditions, and generalize related results in reference in different aspects.     

Hierarchical Porous N-Doped Carbon Nanosheets Obtained by Organic–Inorganic Bipolymeric Engineering for Improved Lithium–Sulfur Batteries

A new route for obtaining N-doped carbon nanosheets through an in situ solid-state thermal organic–inorganic polymerization and carbonization method, with glucose and melamine as precursors, due to different temperature intervals for glucose or melamine polymerization, is reported. At a current rate of 0.2 C, as a cathode for a lithium–sulfur cell, the N-doped carbon nanosheet/sulfur hybrid delivers a high capacity of 1313 and 722 mA h g⁻¹ in the 1st and 200th cycles, respectively; these values are over 40 % higher than that of cells with glucose-derived carbon nanosheets.     

A needle-like Cu2CdSnS4 alloy nanostructure-based integrated electrochemical biosensor for detecting the DNA of Dengue serotype 2

Microchimica Acta - The authors describe an integrated biosensor for amperometric DNA detection of Dengue virus in real time. Cu2CdSnS4 (CCTS) quaternary alloy nanostructures were successfully...