Launch of Geodata Portal @ Purdue Libraries

With more than two years’ efforts, Purdue University Libraries are launching the Geodata Portal @ Purdue on this year’s GIS Day celebration. This geodata portal allows geospatial information users to search for information by two simple criteria: where and what, which greatly reduced the geospatial information access barrier for researchers and learners. Users can preview map, preview metadata, and download maps from the portal. Currently, our portal include data from: (1) open data at all the collaborating universities, including Tufts, Harvard, MIT, and Berkley; (2) data from IndianaMap; (3) Purdue open access map collection: historic aerial photos, topo maps, and campus maps. This data portal is developed based on the open source development project, OpenGeoportal, originated at Tufts University, and collaborated with a big group of other university libraries. Our Purdue’s modification to this project allows the system to work smoothly with Purdue server settings, and two metadata standards (FGDC and ISO) identified and used at Purdue

Investigation of Electron-Phonon Coupling in Epitaxial Silicene by In-situ Raman Spectroscopy

In this letter, we report that the special coupling between Dirac fermion and lattice vibrations, in other words, electron-phonon coupling (EPC), in silicene layers on Ag(111) surface was probed by an in-situ Raman spectroscopy. We find the EPC is significantly modulated due to tensile strain, which results from the lattice mismatch between silicene and the substrate, and the charge doping from the substrate. The special phonon modes corresponding to two-dimensional electron gas scattering at edge sites in the silicene were identified. Detecting relationship between EPC and Dirac fermion through the Raman scattering will provide a direct route to investigate the exotic property in buckled two-dimensional honeycomb materials.Comment: 15 pages, 4 figure

Transit-oriented street design in Beijing

Using Beijing as a case study, this paper seeks to contribute to academic and professional debates about how general Transit-Oriented design principles can be translated into the Chinese context. It focuses on TOD designs of commercial streets adjacent to transit nodes (rather than residential neighbourhoods or other developments). The evidence presented in the paper suggests that while the Chinese public agrees with many of the basic TOD tenets laid out in the international literature, views about specific design aspects are closely linked to national cultural views and practices. Chinese urbanites are as desirous for human activities, pedestrian safety and comfort, visual variety, natural elements (trees and water) and complexity in outdoor spaces as Western publics. At the same time, in line with China’s pre-socialist and socialist style of urbanism, support for cycling and bus lanes, as well as mixed uses and commerce (including street vending) in TOD streets, is much higher than in Western countries. Personal security is less of a concern while the acceptable development scale is much higher than in the West

Transport poverty in Chinese cities : A systematic literature review

Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.The widening income gap in post-reform China has given rise to social inequality. Among those, transport poverty and inequality have significantly affected the daily life of low-income groups. While important, this is an under-researched topic in China. This gap in the academic literature is glaring given the country’s urbanization rates, sprawling cities and income differentials. Most previous studies have only focused on two aspects of transport poverty—job-housing imbalance and accessibility. A comprehensive understanding of the causes and impacts of transport inequality is currently lacking. Therefore, a systematic review of academic literature based on keywords relevant to transport poverty in China was conducted to provide a more complete assessment of the situation in Chinese cities. In total, 62 relevant studies were identified after close examination of the articles (including titles, abstracts, and full-texts). This set of articles allowed a number of general patterns to be identified. It was found that the most common causes of transport poverty include: a lack of access to private vehicles; uneven access to alternative transport options; inadequate public transport provision; jobs-housing imbalance; and the hukou system (a system of household registration which aims to regulate population distribution and rural-to-urban migration). The main impacts of transport poverty include: curtailed mobility and longer travel times; higher household expenditures on travel; reduced access to jobs and essential services; higher household expenditures on travel; and health and environmental issues.Peer reviewe