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  1. Abstract

    Mercury (Hg) is a global pollutant whose atmospheric deposition is a major input to the terrestrial and oceanic ecosystems. Gas‐particle partitioning (GPP) of gaseous oxidized mercury (GOM) redistributes speciated Hg between gas and particulate phase and can subsequently alter Hg deposition flux. Most 3‐dimensional chemical transport models either neglected the Hg GPP process or parameterized it with measurement data limited in time and space. In this study, CMAQ‐newHg‐Br (Ye et al., 2018, was updated to CMAQ‐newHg‐Br v2 by implementing a new GPP scheme and the most up‐to‐date Hg redox chemistry and was run for the northeastern United States over January‐November 2010. CMAQ‐newHg‐Br v2 reproduced the measured spatiotemporal distributions of gaseous elemental mercury (GEM) and particulate bound mercury (PBM) concentrations and Hg wet deposition flux within reasonable ranges and simulated dry deposition flux in agreement with previous studies. The GPP scheme improved the simulation of PBM via increasing winter‐, spring‐ and fall‐time PBM concentrations by threefold. It also improved simulated Hg wet deposition flux with an increase of 2.1 ± 0.7 μgm2in the 11‐month accumulated amount, offsetting half of the decreasing effect of the updated chemistry (−4.2 ± 1.8 μgm2). Further, the GPP scheme captured the observedKp‐T relationship as reported in previous studies without using measurement data and showed advantages at night and in rural/remote areas where existing empirical parameterizations failed. Our study demonstrated CMAQ‐newHg‐Br v2 a promising assessment tool to quantify impacts of climate change and emission reduction policy on Hg cycling.

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    Free, publicly-accessible full text available March 1, 2025
  2. Verma, D. ; Madni, A. M. ; Hoffenson, S. ; Xiao, L. (Ed.)
  3. The United States (US) and the People’s Republic of China (China) have the most patents in nanotechnology in their own depositories and overall in the international depositories. This paper compares nanotechnology landscapes between 2001 and 2017 as reflected in the United States Patent and Trademark Office (USPTO) and China National Intellectual Property Administration (CNIPA). It presents the evolution of nanotechnology patent development in the US and China, the differences between nanotechnology topics addressed in the USPTO and CNIPA patents, key players in nanotechnology fields in both domestic and foreign markets, and the player collaboration patterns. Bibliographic, content, and social network analyses are used. The longitudinal changes of granted patents and ranked countries, patent families, technology fields, and key players in domestic and overseas markets are outlined. Collaboration networks of assignees and the influential players have been identified based on network parameters. Results show that the US market attracts more international collaborations and has a higher level of knowledge exchange and resource sharing than the Chinese market. Companies play a vital role with regard to US nanotechnology development, resulting in more within-industry collaborations. In contrast, universities and research institutes are the dominant contributors to China’s nanotechnology development, leading to more academia-industry collaborations in China’s market. 
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  4. Abstract

    The superτ-charm facility (STCF) is an electron–positron collider proposed by the Chinese particle physics community. It is designed to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5 × 1035cm−2·s−1or higher. The STCF will produce a data sample about a factor of 100 larger than that of the presentτ-charm factory — the BEPCII, providing a unique platform for exploring the asymmetry of matter-antimatter (charge-parity violation), in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions, as well as searching for exotic hadrons and physics beyond the Standard Model. The STCF project in China is under development with an extensive R&D program. This document presents the physics opportunities at the STCF, describes conceptual designs of the STCF detector system, and discusses future plans for detector R&D and physics case studies.

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    Free, publicly-accessible full text available February 1, 2025