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243 results on '"Chen, Runhua"'

12. Dynamically Reconstructed Triple‐Copper‐Vacancy Associates Confined in Cu Nanowires Enabling High‐Rate and Selective CO2 Electroreduction to C2+ Products

Author

Chen, Runhua, primary, Zu, Xiaolong, additional, Zhu, Juncheng, additional, Zhao, Yuan, additional, Li, Yuhuan, additional, Hu, Zexun, additional, Wang, Shumin, additional, Fan, Minghui, additional, Zhu, Shan, additional, Zhang, Hongjun, additional, Ye, Bangjiao, additional, Sun, Yongfu, additional, and Xie, Yi, additional

Published
2024
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15. Enhancement of Peroxydisulfate Activation for Complete Degradation of Refractory Tetracycline by 3D Self-Supported MoS 2 /MXene Nanocomplex.

Author

Song, Yuxia, Chen, Runhua, Li, Shihai, Yu, Shali, Ni, Xiaoli, Fang, Minglong, and Xie, Hanyun

Subjects
*TETRACYCLINES, *TETRACYCLINE, *LIQUID chromatography-mass spectrometry, *REACTIVE oxygen species, *BODIES of water, *ENVIRONMENTAL risk, *REFRACTORY materials
Abstract

Antibiotic abuse, particularly the excessive use of tetracycline (TC), a drug with significant environmental risk, has gravely harmed natural water bodies and even posed danger to human health. In this study, a three-dimensional self-supported MoS2/MXene nanohybrid with an expanded layer spacing was synthesized via a facile one-step hydrothermal method and used to activate peroxydisulfate (PDS) for the complete degradation of TC. The results showed that a stronger •OH signal was detected in the aqueous solution containing MoS2/MXene, demonstrating a superior PDS activation effect compared to MoS2 or Ti3C2TX MXene alone. Under the conditions of a catalyst dosage of 0.4 g/L, a PDS concentration of 0.4 mM, and pH = 5.0, the MoS2/MXene/PDS system was able to fully eliminate TC within one hour, which was probably due to the presence of several reactive oxygen species (ROS) (•OH, SO4•−, and O2•−) in the system. The high TC degradation efficiency could be maintained under the influence of various interfering ions and after five cycles, indicating that MoS2/MXene has good anti-interference and reusability performance. Furthermore, the possible degradation pathways were proposed by combining liquid chromatography–mass spectrometry (LC-MS) data and other findings, and the mechanism of the MoS2/MXene/PDS system on the degradation process of TC was elucidated by deducing the possible mechanism of ROS generation in the reaction process. All of these findings suggest that the MoS2/MXene composite catalyst has strong antibiotic removal capabilities with a wide range of application prospects. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Networked MIMO with Clustered Linear Precoding

Author

Zhang, Jun, Chen, Runhua, Andrews, Jeffrey G., Ghosh, Arunabha, and Heath Jr, Robert W.

Subjects
Computer Science - Information Theory
Abstract

A clustered base transceiver station (BTS) coordination strategy is proposed for a large cellular MIMO network, which includes full intra-cluster coordination to enhance the sum rate and limited inter-cluster coordination to reduce interference for the cluster edge users. Multi-cell block diagonalization is used to coordinate the transmissions across multiple BTSs in the same cluster. To satisfy per-BTS power constraints, three combined precoder and power allocation algorithms are proposed with different performance and complexity tradeoffs. For inter-cluster coordination, the coordination area is chosen to balance fairness for edge users and the achievable sum rate. It is shown that a small cluster size (about 7 cells) is sufficient to obtain most of the sum rate benefits from clustered coordination while greatly relieving channel feedback requirement. Simulations show that the proposed coordination strategy efficiently reduces interference and provides a considerable sum rate gain for cellular MIMO networks., Comment: 27 pages, submitted to IEEE Transaction on Wireless Communications

Published
2008

19. Gradient Cationic Vacancies Enabling Inner‐to‐outer Tandem Homojunction: Strong local Internal Electric Field and Reformed basic sites Boosting CO 2 Photoreduction

Author

Wang, Yinghui, primary, Hu, Jingcong, additional, Ge, Teng, additional, Chen, Fang, additional, Lu, Yue, additional, Chen, Runhua, additional, Zhang, Hongjun, additional, Ye, Bangjiao, additional, Wang, Shengyao, additional, Zhang, Yihe, additional, Ma, Tianyi, additional, and Huang, Hongwei, additional

Published
2023
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26. Herbal Medicine Hewei Jiangni Decoction Is Noninferior to Oral Omeprazole for the Treatment of Nonerosive Gastroesophageal Reflux Disease: A Randomized, Double-Blind, and Double-Dummy Controlled Trail

Author

Li, Feng, primary, Yuan, Yali, additional, Wu, Di, additional, Li, Junxiang, additional, Han, Haixiao, additional, Li, Xiaohong, additional, Hu, Liming, additional, Chen, Runhua, additional, Yao, Yupu, additional, Jiao, Yao, additional, Chen, Huihui, additional, Mao, Tangyou, additional, and Xie, Chune, additional

Published
2022
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28. Fabrication and Microwave Absorption Properties of Core-Shell Structure Nanocomposite Based on Modified Anthracite Coal.

Author

Zhang, Xiaomei, Zhou, Baitong, Li, Xiang, Chen, Runhua, Ma, Chen, Chen, Wenhua, and Chen, Guohua

Subjects
ANTHRACITE coal, ELECTROMAGNETIC wave absorption, MAGNETIC flux leakage, MICROWAVES, DIELECTRIC loss, ELECTRONIC countermeasures, GRAPHITIZATION, NANOCRYSTALS
Abstract

Microwave-absorbing materials have attracted extensive attention due to the development of electronic countermeasures. In this study, novel nanocomposites with core–shell structures based on the core of Fe-Co nanocrystals and the shell of furan methylamine (FMA)-modified anthracite coal (Coal-F) were designed and fabricated. The Diels-Alder (D-A) reaction of Coal-F with FMA creates a large amount of aromatic lamellar structure. After the high-temperature treatment, the modified anthracite with a high degree of graphitization showed an excellent dielectric loss, and the addition of Fe and Co effectively enhanced the magnetic loss of the obtained nanocomposites. In addition, the obtained micro-morphologies proved the core–shell structure, which plays a significant role in strengthening the interface polarization. As a result, the combined effect of the multiple loss mechanism promoted a remarkable improvement in the absorption of incident electromagnetic waves. The carbonization temperatures were specifically studied through a setting control experiment, and 1200 °C was proved to be the optimum parameter to obtain the best dielectric loss and magnetic loss of the sample. The detecting results show that the 10 wt.% CFC-1200/paraffin wax sample with a thickness of 5 mm achieves a minimum reflection loss of −41.6 dB at a frequency of 6.25 GHz, indicating an excellent microwave absorption performance. [ABSTRACT FROM AUTHOR]

Published
2023
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37. Reversible Switching CuII/CuI Single Sites Catalyze High‐rate and Selective CO2 Photoreduction.

Author

Zu, Xiaolong, Zhao, Yuan, Li, Xiaodong, Chen, Runhua, Shao, Weiwei, Li, Li, Qiao, Panzhe, Yan, Wensheng, Pan, Yang, Xu, Qian, Zhu, Junfa, Sun, Yongfu, and Xie, Yi

Subjects
X-ray photoelectron spectra, GIBBS' free energy, PHOTOREDUCTION, PHOTOELECTRON spectra, METAL-organic frameworks, CARBON dioxide
Abstract

Herein, we first design a model of reversible redox‐switching metal–organic framework single‐unit‐cell sheets, where the abundant metal single sites benefit for highly selective CO2 reduction, while the reversible redox‐switching metal sites can effectively activate CO2 molecules. Taking the synthetic Cu‐MOF single‐unit‐cell sheets as an example, synchrotron‐radiation quasi in situ X‐ray photoelectron spectra unravel the reversible switching CuII/CuI single sites initially accept photoexcited electrons and then donate them to CO2 molecules, which favors the rate‐liming activation into CO2δ−, verified by in situ FTIR spectra and Gibbs free energy calculations. As an outcome, Cu‐MOF single‐unit‐cell sheets achieve near 100 % selectivity for CO2 photoreduction to CO with a high rate of 860 μmol g−1 h−1 without any sacrifice reagent or photosensitizer, where both the activity and selectivity outperform previously reported photocatalysts evaluated under similar conditions. [ABSTRACT FROM AUTHOR]

Published
2023
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38. Atom‐Economical Synthesis of Dimethyl Carbonate from CO2: Engineering Reactive Frustrated Lewis Pairs on Ceria with Vacancy Clusters.

Author

Li, Lei, Liu, Wenxiu, Chen, Runhua, Shang, Shu, Zhang, Xiaodong, Wang, Hui, Zhang, Hongjun, Ye, Bangjiao, and Xie, Yi

Subjects
LEWIS pairs (Chemistry), NEAR infrared reflectance spectroscopy, CERIUM oxides, ETHANES, SYNCHROTRON radiation
Abstract

The chemical conversion of CO2 to long‐chain chemicals is considered as a highly attractive method to produce value‐added organics, while the underlying reaction mechanism remains unclear. By constructing surface vacancy‐cluster‐mediated solid frustrated Lewis pairs (FLPs), the 100 % atom‐economical, efficient chemical conversion of CO2 to dimethyl carbonate (DMC) was realized. By taking CeO2 as a model system, we illustrate that FLP sites can efficiently accelerate the coupling and conversion of key intermediates. As demonstrated, CeO2 with rich FLP sites shows improved reaction activity and achieves a high yield of DMC up to 15.3 mmol g−1. In addition, by means of synchrotron radiation in situ diffuse reflectance infrared Fourier‐transform spectroscopy, combined with density functional theory calculations, the reaction mechanism on the FLP site was investigated systematically and in‐depth, providing pioneering insights into the underlying pathway for CO2 chemical conversion to long‐chain chemicals. [ABSTRACT FROM AUTHOR]

Published
2022
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40. A CSI acquisition approach for mmWave massive MIMO

Author

Liu Zhengxuan, Li Hui, Gao Qiubin, Chen Runhua, Shaohui Sun, and Shanzhi Chen

Subjects
Beamforming, Computer Networks and Communications, Computer science, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, MIMO, Codebook, 020206 networking & telecommunications, Data_CODINGANDINFORMATIONTHEORY, 02 engineering and technology, Spectral efficiency, 01 natural sciences, 010309 optics, Base station, Channel state information, Mobile station, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Overhead (computing), Electrical and Electronic Engineering, Computer Science::Information Theory
Abstract

Massive Multiple-Input Multiple-Output (MIMO) is considered as a key technology for 4G and 5G wireless communication systems to improve spectrum efficiency by supporting large number of concurrent users. In addition, for the target frequency band of 5G system, mmWave band, massive MIMO is pivotal in compensating the high pathloss. In this paper, we investigate the channel state information (CSI) acquisition problem for mmWave massive MIMO. With hybrid analog-digital antenna architecture, how to derive the analog beamforming and digital beamforming is studied. An iterative analog beam acquisition approach is proposed to save system overhead and reduce beam searching complexity. Regarding the digital beamforming, a grouping based codebook is proposed to facilitate CSI feedback. The codebook is then extended to incorporate also analog beam acquisition. Furthermore, channel reciprocity is exploited to save CSI reporting overhead and a two-stage approach is proposed to fully utilize the channel reciprocity at both mobile station and base station side and accelerate the CSI acquisition procedure.

Published
2019

41. Removal of Cr(VI) by magnetic Fe/C crosslinked nanoparticle for water purification: rapid contaminant removal property and mechanism of action

Author

Meng Li, Xinxi Fu, Fei Tian, Jiangjun Xiao, Chen Runhua, Yan Shi, Chunlian Ding, and Ping Wang

Subjects
Chromium, Environmental Engineering, Scanning electron microscope, Iron, Dispersity, Nanoparticle, chemistry.chemical_element, 02 engineering and technology, Carbon nanotube, 010501 environmental sciences, 01 natural sciences, Water Purification, Nanomaterials, law.invention, law, Fourier transform infrared spectroscopy, 0105 earth and related environmental sciences, Water Science and Technology, Aqueous solution, Nanotubes, Carbon, Chemistry, 021001 nanoscience & nanotechnology, Nanoparticles, Adsorption, 0210 nano-technology, Water Pollutants, Chemical, Nuclear chemistry
Abstract

In this study, a novel method based on the magnetic Fe/C crosslinked nanoparticles (MNZVI/CNTs-OH) is reported for the effective removal of Cr(VI) in aqueous solutions. Parameters that influence the effectiveness of the nanoparticles, such as pH, temperature, reaction time, and particle dosage, was analyzed. It was found that MNZVI/CNTs-OH particles exhibit significantly higher activity toward Cr(VI) removal than bare NZVI, carbon nanotubes (CNTs), and other synthetic nanomaterials. Under optimized conditions, the removal efficiency of Cr(VI) by MNZVI/CNTs-OH is up to 98% with an initial contaminant concentration of 50 mg/L, and chromium content in the residue up to 48 mg/g. Physical characterizations, including Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and TG-TD measurements, provide insights into the working mechanism of Cr(VI) purification. Our findings suggest that immobilization of MNZVI onto carbon nanotubes increase the covalent bond property, while crosslinked nanoparticles (NPs) provide the electron transfer passage from the NZVI surface and improves the dispersity of the MNZVI, thus enhancing the performance. These results demonstrate the potential of the MNZVI/CNTs-OH nanoparticles for the rapid and efficient treatment of Cr(VI)-containing wastewater.

Published
2018

48. Enhanced genome assembly and a new official gene set for Tribolium castaneum

Author

Herndon, Nicolae, Shelton, Jennifer M., Gerischer, Lizzy, Ioannidis, Panos, Ninova, Maria, Doenitz, Juergen, Waterhouse, Robert M., Liang, Chun Yan, Damm, Carsten, Siemanowski, Janna, Kitzmann, Peter, Ulrich, Julia, Dippel, Stefan, Oberhofer, Georg, Hu, Yonggang, Schwirz, Jonas, Schacht, Magdalena Ines, Lehmann, Sabrina, Montino, Alice, Posnien, Nico, Gurska, Daniela, Horn, Thorsten, Seibert, Jan, Jentzsch, Iris M. Vargas, Panfilio, Kristen A., Li, Jianwei, Wimmer, Ernst A., Stappert, Dominik, Roth, Siegfried, Schroeder, Reinhard, Park, Yoonseong, Schoppmeier, Michael, Chung, Ho-Ryun, Klingler, Martin, Kittelmann, Sebastian, Friedrich, Markus, Chen, Runhua, Altincicek, Boran, Vilcinskas, Andreas, Zdobnov, Evgeny M., Griffiths-Jones, Sam, Ronshaugen, Matthew, Stanke, Mario, Brown, Sue J., Bucher, Gregor, Herndon, Nicolae, Shelton, Jennifer M., Gerischer, Lizzy, Ioannidis, Panos, Ninova, Maria, Doenitz, Juergen, Waterhouse, Robert M., Liang, Chun Yan, Damm, Carsten, Siemanowski, Janna, Kitzmann, Peter, Ulrich, Julia, Dippel, Stefan, Oberhofer, Georg, Hu, Yonggang, Schwirz, Jonas, Schacht, Magdalena Ines, Lehmann, Sabrina, Montino, Alice, Posnien, Nico, Gurska, Daniela, Horn, Thorsten, Seibert, Jan, Jentzsch, Iris M. Vargas, Panfilio, Kristen A., Li, Jianwei, Wimmer, Ernst A., Stappert, Dominik, Roth, Siegfried, Schroeder, Reinhard, Park, Yoonseong, Schoppmeier, Michael, Chung, Ho-Ryun, Klingler, Martin, Kittelmann, Sebastian, Friedrich, Markus, Chen, Runhua, Altincicek, Boran, Vilcinskas, Andreas, Zdobnov, Evgeny M., Griffiths-Jones, Sam, Ronshaugen, Matthew, Stanke, Mario, Brown, Sue J., and Bucher, Gregor

Abstract

Background The red flour beetle Tribolium castaneum has emerged as an important model organism for the study of gene function in development and physiology, for ecological and evolutionary genomics, for pest control and a plethora of other topics. RNA interference (RNAi), transgenesis and genome editing are well established and the resources for genome-wide RNAi screening have become available in this model. All these techniques depend on a high quality genome assembly and precise gene models. However, the first version of the genome assembly was generated by Sanger sequencing, and with a small set of RNA sequence data limiting annotation quality. Results Here, we present an improved genome assembly (Tcas5.2) and an enhanced genome annotation resulting in a new official gene set (OGS3) for Tribolium castaneum, which significantly increase the quality of the genomic resources. By adding large-distance jumping library DNA sequencing to join scaffolds and fill small gaps, the gaps in the genome assembly were reduced and the N50 increased to 4753kbp. The precision of the gene models was enhanced by the use of a large body of RNA-Seq reads of different life history stages and tissue types, leading to the discovery of 1452 novel gene sequences. We also added new features such as alternative splicing, well defined UTRs and microRNA target predictions. For quality control, 399 gene models were evaluated by manual inspection. The current gene set was submitted to Genbank and accepted as a RefSeq genome by NCBI. Conclusions The new genome assembly (Tcas5.2) and the official gene set (OGS3) provide enhanced genomic resources for genetic work in Tribolium castaneum. The much improved information on transcription start sites supports transgenic and gene editing approaches. Further, novel types of information such as splice variants and microRNA target genes open additional possibilities for analysis.

Published
2020

49. Modular and High-Resolution Channel State Information and Beam Management for 5G New Radio

Author

Rakesh Tamrakar, Stephen Grant, Mark Harrison, Chen Runhua, Li Guo, Saifur Rahman, Younsun Kim, Mattias Frenne, Hoondong Noh, Faxér Sebastian, Kwak Youngwoo, Eko Onggosanusi, and and Qiubin Gao

Subjects
Beamforming, Computer Networks and Communications, business.industry, Computer science, 010401 analytical chemistry, 020206 networking & telecommunications, 02 engineering and technology, Modular design, 01 natural sciences, 0104 chemical sciences, Computer Science Applications, Base station, Cellular communication, User equipment, Channel state information, 0202 electrical engineering, electronic engineering, information engineering, Electrical and Electronic Engineering, business, Host (network), Throughput (business), Computer hardware
Abstract

This article provides an overview of key features pertaining to CSI reporting and beam management for the 5G New Radio (NR) currently being standardized in 3GPP. For CSI reporting, the modular design framework and high-resolution spatial information feedback offer not only flexibility in a host of use cases and deployment scenarios, but also improved average user throughput over state-of-the-art 4G LTE. To accommodate cellular communications in the milimeter-wave regime where a combination of analog and digital beamforming is typically used at both a base station and user equipment, beam management procedures such as measurement, reporting, and recovery are introduced. The utility and joint usage of these two features are demonstrated along with some potential upgrades for the next phase of 5G NR. Introduction

Published
2018

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