Reviewing the Effect of English as a Foreign Language Teachers' Positive and Negative Affectivity on Their Work Engagement.

This review strives to illuminate the related studies on the effect of English as a Foreign Language (EFL) teachers' positive and negative emotions on their work engagement. The negative correlations among teachers' boredom, apprehension, shame, frustration, and work engagement have been confirmed in the review of the literature. Furthermore, few studies have validated the effect of teachers' positive emotions, such as enjoyment and pride, on their work engagement in educational contexts. The studies showed that some factors, such as teacher self-efficacy, teacher self-sufficiency, increased academic challenges, and ambiguity in educational contexts, can mediate the relationship between teachers' negative emotions and work engagement. The review of literature has emphasized the mediating role of growth mindset in the relationship between teachers' positive emotions and work engagement. To improve the language teaching quality, the pedagogical implications are explained in the end. Some suggestions for further research are provided to expand the literature about teachers' emotional variables.

Surface-enhanced Raman spectroscopy study on the structure changes of 4-mercaptopyridine adsorbed on silver substrates and silver colloids.

Surface-enhanced Raman scattering (SERS) of 4-mercaptopyridine (4-mpy) adsorbed on HNO3 etched silver foil, chemically deposited silver films (silver mirror) and silver colloids were measured. The SERS study has revealed that 4-mpy was adsorbed onto the three kinds of silver surfaces by a sulfur-silver bond with the plane of pyridine ring being normal to the silver substrates. The structure of 4-mpy adsorbed on the silver surfaces depends largely on the pH values of environment. When the pH values of the environment are changed, the structure of 4-mpy adsorbed on silver surfaces can easily be altered through a protonation or deprotonation reaction occurring on the N atom of the pyridine ring, and the modified structure shows unique characters on the SERS spectrum. Owing to the remarkable enhancement ability of SERS technique and characteristic spectrum of different species, a monolayer of 4-mpy assembled on a silver mirror holds potential as a H+ sensor for highly sensitive detection of the proton concentration in an aqueous solution.

Hydrogen-bonded 1,2-bis(4-pyridyl)ethylene and maleic acid.

The title compound (systematic name: 4,4'-ethylenedipyridinium dimaleate), C(12)H(12)N(2)(2+).2C(4)H(3)O(4)(-), is a 1:2 adduct of 1,2-bis(4-pyridyl)ethylene (BPE) and maleic acid (MA). The interaction between the two components in the molecular complex is due to intermolecular hydrogen bonding via an N(+)-H.O(-) hydrogen bond.