Article
Environmental Studies
Tessa Conroy, Sarah A. Low
Summary: The study highlights the significant impact of broadband access on establishment birth rates in rural areas, particularly on nonemployer, women-led, and remote rural establishments.
INTERNATIONAL REGIONAL SCIENCE REVIEW
(2022)
Article
Communication
Yulong Chen, Liyuan Ma, Peter F. Orazem
Summary: Broadband access has varying effects on establishment entry and exit across industries and markets. Overall, broadband encourages entry and reduces exit. Both urban and rural markets experience net entry due to broadband entry. The effects of broadband differ by sector, with construction and professional services having establishment gains in both urban and rural markets. Finance and insurance, real estate, information, and arts and entertainment sectors only have net establishment gains in urban markets. Urban retail and rural manufacturing and hospitality sectors experience net establishment losses. Broadband also leads to a net reallocation of educational services establishments from rural to urban areas.
TELECOMMUNICATIONS POLICY
(2023)
Article
Engineering, Mechanical
Xinyue Wu, Zhihui Wen, Yabin Jin, Timon Rabczuk, Xiaoying Zhuang, Bahram Djafari-Rouhani
Summary: A new seismic metamaterial is proposed, which broadens the wave attenuation frequency range and shifts it towards lower frequencies through a combination of pillars and core-shell structures. Analysis of the symmetry of the excited Rayleigh wave and the eigenmodes in the dispersion curves shows that the frequency range of efficient wave attenuation in transmission is much wider than that of the corresponding bandgap.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Optics
Jianwei Zhou, Hongxing Cai, Yu Ren, Shuang Li, Chunxu Jiang, Zhong Lv, Guannan Qu, Yong Tan, Jing Shi, Tingting Wang, Quansheng Liu
Summary: This paper proposes a broadband NIR detector imaging scheme based on nonlinear crystal frequency conversion, which utilizes silicon-based detectors for direct detection, overcoming the limitations of existing NIR detectors in terms of high cost and noise. The effectiveness of the scheme is validated through theoretical investigation and experimental measurement.
Article
Engineering, Mechanical
Zhiwen Ren, Hao-Wen Dong, Xudong He, Mingji Chen, Daining Fang
Summary: This study proposes a design method for underwater gradient metalenses, which can achieve broadband, high-efficiency, high-gain, and high-symmetry acoustic focusing. By optimizing the refractive index profile and using a square-latticed metamaterial, the conversion of plane waves to subwavelength focusing is achieved over a wide frequency range. Additionally, the design exhibits good environmental adaptability, making it suitable for use in high-pressure environments.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Yuzhen Zhao, Chaonian Li, Tingting Lang, Jinqian Li, Zhun Guo, Ruijuan Yao, Jianjing Gao, Yang Zhao, Dong Wang
Summary: This study successfully prepared broadband reflective polymer-stabilized cholesteric liquid crystal (PSCLC) films in the near-infrared region by spin-coating MoO2 nanoparticle dispersions onto the liquid crystal film. The diffusion of nanoparticles was found beneficial for the formation of non-uniform pitch distribution, providing a potential dynamic control solution for energy-saving glass in buildings.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Communication
Martin Falk, Eva Hagsten
Summary: The study found that high-speed fiber broadband has a significant but rather small direct effect on establishment dynamics at the municipality level, with a stronger indirect relationship when combined with the presence of university educated employees and researchers. There is also evidence of a spillover effect from broadband availability in neighboring municipalities.
TELECOMMUNICATIONS POLICY
(2021)
Article
Acoustics
Fuyin Ma, Linbo Wang, Hao Zhang, Zhen Huang, Pengyu Du, Jiu Hui Wu
Summary: This study proposes a dual-gradient artificial meta-auricle that can comprehensively enhance underwater sound signals through wave-front reflection phase modulation and geometrical concave reflection mechanisms. The two focusing mechanisms are superimposed with each other in the geometric center region, effectively enhancing the focusing amplitude and greatly broadening the working frequency band.
Article
Physics, Applied
Tinggui Chen, Junrui Jiao, Dejie Yu
Summary: The GCM proposed in this study combines gradient and coiled structures to achieve enhanced broadband acoustic sensing, with the ability to amplify acoustic signals up to approximately 80 times over a wide frequency range. By coupling coiled structures, trapped and enhanced frequencies in the GCM can be reduced by nearly 43%. Experimental results demonstrate that GCM can enhance frequency-selective unknown signals and effectively recognize and recover harmonic signals from strong background noise.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Feng Luo, Dongqing Liu, Taishan Cao, Haifeng Cheng, Jiacai Kuang, Yingjun Deng, Wei Xie
Summary: The newly designed gradient porous structure for microwave absorbing material showed improved broadband performance with reduced reflection of electromagnetic waves and enhanced attenuation capability. This study provides a new design strategy for antiradar detection technique and shielding electromagnetic interference.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Chemistry, Physical
Xiaoming Chen, Xin Wang, Kaiqiang Wen, Jiangbin Zhang, Fengwan Zhao, Jie Zhang, Yijie Wang, Qihang Song, Chenglin Yi, Jinyou Shao
Summary: A new strategy was developed to simultaneously enhance the lossy capacity and reduce the inclusion loading by designing the orientation of inclusions and constructing multilayered gradient structures. The Ti3C2Tx MXene fillers were aligned in the same chains by the electric field-assisted alignment technique, resulting in a parallel-plate structure and strong lossy capacity. The aligned composite exhibited wider effective absorption bandwidth and smaller thickness compared to the random composite.
Article
Mathematics
Geman Shi, Xiaoxun Wu, Renjie Jiang, Shande Li
Summary: The sound insulation capacity of traditional sound insulation boards is limited by mass, conflicting with the demand for light weight. To address this issue, a lightweight particle reinforced gradient honeycomb sandwich panel is proposed for lightweight sound insulation. The sound insulation is calculated based on the transfer matrix method and verified through finite element simulation. It is found that adding reinforcement particles to the aluminum matrix can significantly improve the sound insulation of the honeycomb sandwich panel, and the sound insulation also increases with the particle mass fraction of the reinforcement. Furthermore, the sound insulation performance of the sandwich plate at low frequencies is effectively improved.
Article
Plant Sciences
Meghan Midgley, Elsa Anderson, Emily Minor
Summary: The study revealed that different techniques for establishing plant communities in vacant lots have varying impacts on the ecosystem services provided by urban soils. Lawns showed the highest carbon storage, while moderate planting of vegetation can improve nutrient retention. However, intensive gardening treatment with high investment may decrease water infiltration.
URBAN FORESTRY & URBAN GREENING
(2021)
Article
Optics
Yuhang Sun, Yumin Liu, Tiesheng Wu, Jun Wu, Yu Wang, Jing Li, Han Ye
Summary: The research demonstrates that by modulating phase changes at the interface, efficient broadband polarization-independent metasurfaces can be achieved for polarization conversion and anomalous reflection. This new type of metasurface can cover the full 2p phase range of cross-polarized light and achieve high-purity anomalous cross-polarization efficiency in a specific wavelength range.
Article
Nanoscience & Nanotechnology
Boling Lan, Tao Yang, Guo Tian, Yong Ao, Long Jin, Da Xiong, Shenglong Wang, Hongrui Zhang, Lin Deng, Yue Sun, Jieling Zhang, Weili Deng, Weiqing Yang
Summary: This article introduces a cochlear-inspired multichannel piezoelectric acoustic sensor (MAS) based on gradient PVDF piezoelectric nanofibers for broadband voice recognition. Compared with traditional piezoelectric ceramic or piezoelectric fiber acoustic sensors, MAS has a wider frequency response range and a stronger piezoelectric output. Furthermore, this sensor can be used for high-fidelity music recording and human voice recognition, with a classification accuracy rate of up to 100% when combined with deep learning. This research has universal significance for the development of intelligent bioelectronics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Green & Sustainable Science & Technology
Jean Dube, Maha AbdelHalim, Nicolas Devaux
Summary: This paper introduces an innovative methodological framework based on spatial matching to measure the impact of urban externalities and natural disasters on willingness-to-pay. Through empirical investigation, researchers found that flooding events lead to a decrease in housing prices of about $20,000 Canadian dollars.
Article
Green & Sustainable Science & Technology
Maha AbdelHalim, Jean Dube, Nicolas Devaux
Summary: This study estimated and decomposed the spatial and temporal effects of a flood event in the city of Laval in 1998 using a hedonic pricing model based on a difference-in-differences estimator. The evaluation procedure needs to be adjusted to account for the negotiation process between buyers and sellers before the event, as the impact is time dependent and may be biased if not properly isolated. It is important to adapt the statistical methodological framework to precisely identify flooded areas and correctly estimate the impact on houses affected by the flood.
Article
Environmental Studies
Yves-Bryand Yao, Jean Dube, Mathieu Carrier, Francois Des Rosiers
Summary: Noise barriers are found to be an effective solution in reducing negative externalities, but they also create local negative impacts for property owners. The net impact of noise barriers appears to be place-dependent, with houses closer to the metropolitan core receiving a price premium.
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT
(2021)
Article
Urban Studies
Diego Andres Cardenas Morales, Jean Dube
Summary: This article examines the spatial evolution of mergers and acquisitions (M&A) in Canada and investigates the path dependence process of corporate control geography. The findings suggest that the geography of economic decision-making is highly dependent on historical paths, with Toronto, Montreal, Vancouver, and Calgary being the main destinations for M&As. However, Winnipeg and Guelph have emerged as new power centers.
JOURNAL OF URBAN AFFAIRS
(2023)
Article
Economics
Marie-Pier Champagne, Jean Dube, Philippe Barla
Summary: The aim of this paper is to investigate the impact of metro line extension on real estate development. The study finds that new commercial buildings tend to be developed within 750 meters of the stations, while new residential buildings are mainly concentrated between 1000 and 1250 meters. Additionally, there is a joint increase in residential and commercial constructions near the stations after the service is operational, indicating the growth of mixed-use neighborhoods.
JOURNAL OF TRANSPORT GEOGRAPHY
(2022)
Article
Economics
Chloe Duvivier, Claire Bussiere
Summary: This study provides new evidence on the impact of ultrafast broadband on rural economies, suggesting that positive effects are limited to rural municipalities with good initial conditions, and focusing on broadband access alone is likely to have little impact in structurally weak rural areas.
JOURNAL OF REGIONAL SCIENCE
(2022)
Article
Environmental Studies
Jean Dube, Ousmane Dieng, Mathieu Levesque, Antoine Racine, Olivier Roberge, Thibault Trape
Summary: The aim of this paper is to propose a methodology to analyze the effects of urban planning policies and major events on the spatial distribution of residential and economic activities over time. The paper suggests using centrographic analysis and a vector autoregressive model to examine the statistical relationships between changes in spatial distribution. This framework allows for the investigation of the causal impact of public action and events on spatial footprints and activity distribution. The framework is applied to a case study of a Canadian city but can be used in other cases as well.
Review
Economics
Marie-Pier Champagne, Jean Dube
Summary: This paper explores the impact of transportation infrastructure on firms' location decision by examining existing literature. Through three different databases, the research identifies 338 potential papers, with 52 of them used for analysis. The study presents a complete descriptive analysis of the selected papers, as well as a meta-analysis based on all reported statistics. The meta-analysis results suggest a more positive and significant impact of transport infrastructure on finance, insurance, and real estate activities (FIRE) from a quantitative perspective. The study also emphasizes the importance of considering the spatial and temporal dimensions of location activities when evaluating the impact of transport infrastructure, as omitting one of these dimensions may lead to overestimation of the effect and bias in the observed results.
Article
Development Studies
Jean Dube, Francois Des Rosiers, Nicolas Devaux
Summary: This paper aims to investigate the impact of new social housing on property values. The analysis is based on a comprehensive review of new social housing projects built between 2000 and 2020, and single-family house transactions that occurred between 2004 and 2020 in Quebec City, Canada. By developing a repeated sales model with a difference-in-differences estimator, the study isolates the net price premium associated with the emergence of a new social housing building while considering the characteristics of the building and the local context. The results reveal a complex net price premium rent function, leading to mixed conclusions and important implications for the development of new social housing projects.
HOUSING POLICY DEBATE
(2023)
Article
Economics
Sonia Yousfi, Jean Dube, Diego Legros, Sotirios Thanos
ANNALS OF REGIONAL SCIENCE
(2020)
Article
Environmental Studies
Marius Theriault, Iwan Le Berre, Jean Dube, Adeline Maulpoix, Marie-Helene Vandersmissen
Article
Economics
Ismaelh Cisse, Jean Dube, Cedric Brunelle
ANNALS OF REGIONAL SCIENCE
(2020)
Article
Economics
Yannick Marchand, Jean Dube, Sebastien Breau
ECONOMIC GEOGRAPHY
(2020)
