Although the chick long ago achieved the position of a classic in embryological studies, certain crucial details in the establishment of its pulmonary circulation have been left in t,he greatest obscurity. The textbooks for many years have been giving accounts, adequate enough, of the origin of the pulmonary artery, but the development of the corresponding vein has for the most part been mentio...

The economic, social and environmental benefits generated by the use of urban public transportation infrastructure constitute a complex dynamic urban public transportation infrastructure utilization benefit system. This paper evaluates the coupling coordination among these three benefits taking four Chinese autonomous municipalities as an example. These four cities have large-scale urban public...

Concentrations of 13 perfluoroalkyl substances (PFASs) were quantified in 79 surface soil samples from 17 coastal cities in three provinces and one municipality along the Bohai and Yellow Seas. The ∑PFASs concentrations ranged from less than limitation of quantification (LOQ) to 13.97 ng/g dry weight (dw), with a mean of 0.98 ng/g dw. The highest concentration was observed along the Xiaoqing Ri...

History (sometimes) matters for the location and sizes of cities neighborhood segregation patterns within cities. Together with evidence on rapid change self-fulfilling expectations, this implies that nature might not completely determine spatial structure economy. Instead, economy be characterized by multiple equilibria or steady-state equilibrium paths, where history expectations can play dec...

Introduction Cities 1 are a major form of the material, social and symbolic organization of societies. They are persistent and adaptive structures which fulfill a variety of social functionalities: habitat, production, services, political control over people and territories, as well as technical and symbolic mediation between nature and culture, groups and individuals. For a long time, and espe...

A cluster model for active site of nanotube (C48) was presented and investigated the geometricstructure and thermochemical parameters. Quantum-mechanical calculations were performed at theHF / 510-30, 6-310, 6-3 IG• and 6-310" levels of theory in the gas phase and three solvents atfour temperatures. Also, nuclear shielding parameters of the active site of nanotube have been takeninto account us...

Collaboration is strongly promoted as an effective means for cities to respond climate change. While collaboration perceived offer opportunities progress action in cities, little known about how can enable low-carbon transformation practice. Furthermore, while largely framed a positive endeavour, there need more carefully explore the challenges and barriers that may arise. This paper explores a...

Nowadays, urban computing has gained a lot of interest in regards to guiding the evolution of cities into intelligent environments. These environments can be appropriated for interactions between individuals that may ultimately affect and modify their behavior. These changes require new approaches that allow us to better understand how urban computing systems should be modeled. In this work, we...

Recent advances in the urban science make broad use of the notion of scaling. We focus here on the important scaling relationship between the gross metropolitan product (GMP) of a city and its population (pop). It has been demonstrated that GMP ∝ Y Ypopβ with β always greater than 1 and close to 1.2. This fundamental finding highlights a universal rule that holds across countries and cultures a...