Design of the cheap and high efficiency catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is imperative for rechargeable Zn-batteries (r-ZABs). Herein, the cobalt nanoparticles encapsulated in iron and nitrogen co-doped urchin-like porous carbons (Co@Fe-Nx/C) as a...

Scholars have emphasized the gradual ownership transformation of enterprises as a key driver of the Chinese economy’s unprecedented growth. However, little work has been done on the issue of whether this transformation process takes place evenly across the various regions in China. This paper...

The objective of this paper is to understand the financial dynamics of the airline industry by identifying profit cycle periods of the industry and their driving factors. Assuming that the industry profit cycles could be modeled as an undamped second-order system, the fundamental cycle period...

Tourism industry is comprehensive, so it is able to converge with a great deal of industries. A case in point is intelligent tourism. Recently with the informatization increasingly developing, intelligent tourism has been taken seriously by the government and its fast development requires...

Very small but cumulated decreases in food intake may be sufficient to erase obesity over a period of years. We examine the effect of slight changes in the accessibility of different foods in a pay-by-weight-of-food salad bar in a cafeteria serving adults for the lunch period. Making a food...

Informal care is a primary source of support for older adults with cognitive impairment but is less available to those who live alone. We leverage the U.S. Health and Retirement Survey 2000-2018 to examine trends in the prevalence of physical disability and social support among older adults with...

Informal care is a primary source of support for older adults with cognitive impairment but is less available to those who live alone. We leverage the U.S. Health and Retirement Survey 2000-2018 to examine trends in the prevalence of physical disability and social support among older adults with...