Cyclooctatetraene (COT), the first 4nπ-electron system to be studied, adopts an inherently nonplanar tub-shaped geometry of D2d symmetry with alternating single and double bonds, and hence behaves as a nonaromatic polyene rather than an antiaromatic compound. Recently, however, considerable 8π-antiaromatic paratropicity has been shown to be generated in planar COT rings even with the bond alter...

The typical bathtub curve and its “standard”shape have been widely accepted as an engineering tool in reliability management and training. However, some recent researches reveal that the typical theory of ‘bathtub curve’is not so convincing in some situations. Therefore, a critical discussion is developed to research the bath-tub curve along three significant periods of bath-tub; i.e. infant mo...

High-performance electromagnetic interference (EMI) shielding material that can function properly under extreme working conditions is critical for their practical applications. Herein, flexible and highly conductive meta-aramid (PMIA) nonwoven fabrics were fabricated by combining polydopamine (PDA) modification electroless silver plating. The PDA greatly enhanced the efficient deposition of nan...

1. Anonymous, Towels beat hot air driers hands down. Associated Press Newswire, 1993(July). Handwashing Michaels. Reports on a study done by the University of Westminster and financed by the Association of Soft Tissue Paper Manufacturers finding that hot air dryers increased bacteria on hands more than 500%. 2. Anonymous, Alcohol for hand hygiene: New comparative studies add to the evidence bas...

introductionthe expanding production of fuels, drugs, fertilizers, chemicals, and hazardous materials has caused considerable environmental contaminations. the contamination of soil and groundwater with petroleum hydrocarbon-based fuels as a result of accidental spills or improper storage has been reported frequently. iran is seriously facing soil contamination problem, due to owning 8.58% of t...