the object of the regional planning is optimum use of resource for the development of regions. one of the most important items in regional development is the recognition of spatial and economical structure of the region. middle sized cities, have the secondary role in the study of economical structure of the regions. global experiments demonstrate that lack of attention to the role of secondary...

Central place theory is a key building block of economic geography and an empirically plausible description of city systems. This paper provides a rationale for central place theory via a dynamic programming formulation of the social planner’s problem of city hierarchy. We show that there must be one and only one immediate smaller city between two neighboring larger-sized cities in any optimal ...

BACKGROUND Yantai is a developed medium-sized coastal city in Eastern China, having a population of 1.6845 million. With the development of economy, some middle-aged and adolescent people (< 45 years) devote themselves to work and suffer from greater stress, which makes them ignore their own health. Moreover, they have unhealthy lifestyles and lack the knowledge of cardiovascular risk factors. ...

Background and Objectives: Community-based studies of stalking in European countries are scarce. The aim of the present study was to replicate the epidemiological study by Dressing and colleagues, which analyzed a sample drawn from a middle-sized German city (Dressing et al., 2005) by using a general population sample (urban as well as rural citizens) from Eastern Austria. Methods: In a survey ...

Arvand is the name of robots specially designed and constructed by sharif CE team for playing soccer according to RoboCup rules and regulations for the middle size robots. Two diierent types of robots are made, players and the goal keeper. A player robot consists of three main parts: mechanics (motion mechanism and kicker), hardware (image acquisition, processing unit and control unit) and soft...

This study aims at reviewing whether regional and generational differences exist in behavior intention to adopt low-carbon travel modes. Based on 759 questionnaires collected from three cities (Zhenjiang, Suzhou, Shanghai) with different population sizes China, we develop a modified theory of planned (MTPB) model framework integrating transport policies, psychological aspects, personal norms, h...