Let $\Sigma$ be a compact oriented surface. The Dehn twist along every simple closed curve $\gamma \subset \Sigma$ induces an automorphism of the fundamental group $\pi$ $\Sigma$. There are two possible ways to generalize such automorphisms if $\gamma$ is allowed have self-intersections. One way consider `generalized twist' $\gamma$: Malcev completion whose definition involves intersection oper...

Quantum interference in coherent transport through single molecular rings may provide a mechanism to control the current in molecular electronics. We investigate its applicability, using a single-particle Green function method combined with ab initio electronic structure calculations. We find that the quantum interference effect (QIE) is strongly dependent on the interaction between molecular p...

The emission spectrum of IrN was recorded in the near infrared using a Fourier transform spectrometer. The IrN molecules were excited in an Ir hollow cathode lamp operated with a mixture of Ne and a trace of N(2). Numerous IrN bands observed in the 7500-9200 cm(-1) region were assigned to a new a(3)Pi-X(1)Sigma(+) electronic transition with the 0-0 bands of the a(3)Pi(0)-X(1)Sigma(+) and a(3)Pi...

The sigma receptors have been implicated in the regulation of the cardiovascular system, and sigma-1 receptor transcripts have been found in parasympathetic intracardiac neurons. However, the cellular function of sigma-1 receptors in these cells remains to be determined. Effects of sigma receptor activation on voltage-activated K(+) channels and action potential firing were studied in isolated ...

A model aquatic ecosystem is devised for studying relatively volatile organic compounds and simulating direct discharge of chemical wastes into aquatic ecosystems. Six simple benzene derivatives (aniline, anisole, benzoic acid, chlorobenzene, nitrobenzene, and phthalic anhydride) and other important specialty chemicals: hexachlorobenzene, pentachlorophenol, 2,6-diethylaniline, and 3,5,6-trichlo...

High-resolution photodetachment spectra of CCO(-) and CCS(-) using slow photoelectron velocity-map imaging spectroscopy are reported. Well-resolved transitions to the neutral X (3)Sigma(-), a (1)Delta, b (1)Sigma(+), and A (3)Pi states are seen for both species. The electron affinities of CCO and CCS are determined to be 2.3107+/-0.0006 and 2.7475+/-0.0006 eV, respectively, and precise term ene...

By analyzing $e^+e^-$ annihilation data corresponding to an integrated luminosity of $2.93\,\rm fb^{-1}$ collected at the center-of-mass energy 3.773\,GeV with BESIII detector, we report first observations doubly Cabibbo-suppressed decays $D^+\to K^+\pi^0\pi^0$ and K^+\pi^0\eta$. The branching fractions K^+\pi^0\eta$ are measured be $(2.1 \pm 0.4_{\rm stat} 0.1_{\rm syst})\times 10^{-4}$ 0.5_{\...

-This article presents an investigation which studied how training o f sigma-pi networks with the associative reward-penalty ( A R-p ) regime may be enhanced by using two networks in parallel. The technique uses what has been termed an unsupervised "'adaptive critic element" (ACE) to give critical advice to the supervised sigma-pi network. We utilise the conventions that the sigma-pi neuron mod...

Line oscillator strengths in the 20 electric dipole-allowed bands of (14)N(2) in the 89.7-93.5 nm (111480-106950 cm(-1)) region are reported from photoabsorption measurements at an instrumental resolution of approximately 6 mA (0.7 cm(-1)) full width at half maximum. The absorption spectrum comprises transitions to vibrational levels of the 3p sigma(u) c(4)' (1)Sigma(u)(+), 3p pi(u) c(3) (1)Pi(...