119 results on '"Luo, Mingyu"'
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102. Performance Evaluations of Four MAF-Based PLL Algorithms for Grid-Synchronization of Three-Phase Grid-Connected PWM Inverters and DGs
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Han, Yang, primary, Luo, Mingyu, additional, Chen, Changqing, additional, Jiang, Aiting, additional, Zhao, Xin, additional, and Guerrero, Josep M., additional
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- 2016
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103. Comparative Performance Evaluation of Orthogonal-Signal-Generators-Based Single-Phase PLL Algorithms—A Survey
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Han, Yang, primary, Luo, Mingyu, additional, Zhao, Xin, additional, Guerrero, Josep M., additional, and Xu, Lin, additional
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- 2016
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104. Inverse design multilayers for infrared camouflage with thermal management.
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Jiang, Xinpeng, Li, Xin, Luo, Mingyu, and Yang, Junbo
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- 2023
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105. Dynamics assessment of grid-synchronization algorithms for single-phase grid-connected converters
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Han, Yang, primary, Luo, Mingyu, additional, and Guerrero, Josep M., additional
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- 2015
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106. Inverse design multilayers for infrared camouflage with thermal management
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Zhuang, Songlin, Chu, Junhao, Jiang, Xinpeng, Li, Xin, Luo, Mingyu, and Yang, Junbo
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- 2023
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107. Comparative Performance Evaluation of Phase-Locked Loop (PLL) Algorithms for Single-Phase Grid-Connected Converters
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Yang Han, Pan Shen, Chang Lu, Zhifeng Zhou, Luo Mingyu, and Aiting Jiang
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Engineering ,business.industry ,020209 energy ,020208 electrical & electronic engineering ,02 engineering and technology ,Converters ,Small-signal model ,Phase-locked loop ,Control theory ,Harmonics ,PLL multibit ,Voltage sag ,0202 electrical engineering, electronic engineering, information engineering ,Harmonic ,Electronic engineering ,business ,Algorithm ,DC bias - Abstract
The phase-locked loop (PLL) algorithms are of crucial significance for the stable operation and effective grid-integration of power converters and renewable energy systems. In this paper, a comprehensive analysis and performance comparison is presented on the detection performance for three PLLs (NTD-PLL, DCOC-PLL and TPFA-PLL) under grid voltage disturbances, such as phase jump, frequency step change, voltage sag, harmonics, dc offset scenarios and noise. Through theoretical analysis and digital simulations, it is found that the NTD-PLL has the best performance under frequency step change scenario, and under dc offset scenario, the DCOC-PLL would be a good choice. For the TPFA-PLL, a strong harmonic immunity is realized due to the application of the moving average filter (MAF). Besides, the small-signal models of the three PLLs are proposed in this paper. The stability analysis, PI parameters design guidelines of the PLLs are presented as well. Finally, the simulation results are presented to validate the effectiveness of the theoretical analysis. more...
108. Current syphilis infection in virally suppressed people living with HIV: a cross-sectional study in eastern China.
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He L, Pan X, Yang J, Zheng J, Luo M, Cheng W, and Chai C
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- Humans, Cross-Sectional Studies, Male, Adult, Female, China epidemiology, Middle Aged, Risk Factors, Syphilis epidemiology, HIV Infections epidemiology, HIV Infections complications, Viral Load
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Background: Antiretroviral therapy (ART) has been shown to reduce human immunodeficiency virus (HIV) viral replication and ultimately achieve viral suppression and eliminate HIV transmission. However, little is known about the impact of viral suppression on high-risk behaviors and sexually transmitted infections (STIs)., Objective: This study aimed to assess the rates of current syphilis infection in virally suppressed people living with HIV (PLWH) and whether with the duration of ART can reduce the current syphilis infection in eastern China., Method: We conducted a cross-sectional survey of PLWH in Zhejiang Province, China, in 2022. PLWH who were on ART >6 months and were virally suppressed (viral load <50 copies/mL) were included in the study. Data were collected from the National Epidemiological Database of Zhejiang Province and all participants were tested for viral load and current syphilis. Multivariable logistic regression was used to identify risk factors associated with current syphilis infection., Result: A total of 30,744 participants were included in the analysis. 82.7% of participants were male, the mean age was 44.9 ± 14.1 years, 84.9% had received ART in a hospital setting, the mean time on ART was 5.9 ± 3.1 years and 5.6% of participants were infected with current syphilis. Multivariable logistic regression showed that being male [adjusted odds ratio (aOR): 2.12, 95% confidence interval (CI): 1.69-2.66], high level of education (aOR: 1.23, 95% CI: 1.02-1.49), homosexual route of HIV infection (aOR: 1.80, 95% CI: 1.60-2.04), non-local registered residence (aOR: 1.29, 95% CI: 1.11-1.51), had history of STIs before HIV diagnosis (aOR: 1.95, 95 % CI: 1.75-2.18) and treatment provided by a municipal hospital (aOR: 2.16, 95% CI: 1.31-3.55) were associated with increased risk of current syphilis infection. Being married (aOR: 0.67, 95% CI: 0.58-0.76) was associated with a decreased risk of current syphilis infection., Conclusion: Our findings revealed a high rate of current syphilis infection among virally suppressed PLWH in eastern China. Duration of ART did not reduce the prevalence of current syphilis infection. Targeted interventions to reduce current syphilis infection should be prioritized for subgroups at higher risk., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2024 He, Pan, Yang, Zheng, Luo, Cheng and Chai.) more...
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- 2024
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109. Real-time channel selection in multi-mode multiplexing optical interconnection implemented by hybrid algorithm and material system.
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Du T, Luo M, Ma H, Jiang X, Zhang Z, Peng Z, Huang P, Zou H, and Yang J
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Multi-mode multiplexing optical interconnection (MMOI) has been widely used as a new technology that can significantly expand communication bandwidth. However, the constant-on state of each channel in the existing MMOI systems leads to serious interference for receivers when extracting and processing information, necessitating introducing real-time selective-on function for each channel in MMOI systems. To achieve this goal, combining several practical requirements, we propose a real-time selective mode switch based on phase-change materials, which can individually tune the passing/blocking of different modes in the bus waveguide. We utilize our proposed particle swarm optimization algorithm with embedded neural network surrogate models (NN-in-PSO) to design this mode switch. The proposed NN-in-PSO significantly reduces the optimization cost, enabling multi-dimensional simultaneous optimization. The resulting mode switch offers several advantages, including ultra-compactness, rapid tuning, nonvolatility, and large extinction ratio. Then, we demonstrate the real-time channel selection function by integrating the mode switch into the MMOI system. Finally, we prove the fabricating robustness of the proposed mode switch, which paves the way for its large-scale application. more...
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- 2024
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110. Corrigendum: Analysis of a super-transmission of SARS-CoV-2 omicron variant BA.5.2 in the outdoor night market.
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Luo M, Liu S, Zhu L, Wang F, Wu K, He H, Qi X, Pang Z, Dong X, Gong Z, and Yu M
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[This corrects the article DOI: 10.3389/fpubh.2023.1153303.]., (Copyright © 2023 Luo, Liu, Zhu, Wang, Wu, He, Qi, Pang, Dong, Gong and Yu.)
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- 2023
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111. Interactions between arsenic migration and CH 4 emission in a soil bioelectrochemical system under the effect of zero-valent iron.
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Lin Z, Wang L, Luo M, Yi X, Chen J, and Wang Y
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- Soil, Bacteria genetics, Bacteria metabolism, Methane metabolism, Iron metabolism, Arsenic
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Dissimilatory soil arsenic (As) reduction and release are driven by microbial extracellular electron transfer (EET), while reverse EET mediates soil methane (CH
4 ) emission. Nevertheless, the detailed biogeochemical mechanisms underlying the tight links between soil As migration and methanogenesis are unclear. This study used a bioelectrochemical-based system (BES) to explore the potential effects of zero-valent iron (ZVI) addition on "As migration-CH4 emission" interactions from chemical and microbiological perspectives. Voltage and ZVI amendment experiments showed that dissolved As was efficiently immobilized with increased CH4 production in the soil BES, As release and CH4 production exhibited a high negative exponential correlation, and reductive As dissolution could be entirely inhibited in the methanogenic stage. Gene quantification and bacterial community analysis showed that in contrast to applied voltage, ZVI changed the spatial heterogeneity of the distribution of electroactive microorganisms in the BES, significantly decreasing the relative abundance of arrA and dissimilatory As/Fe-reducing bacteria (e.g., Geobacter) while increasing the abundance of aceticlastic methanogens (Methanosaeta), which then dominated CH4 production and As immobilization after ZVI incorporation. In addition to biogeochemical activities, coprecipitation with ferric (iron) contributed 77-93% dissolved As removal under ZVI addition. This study will enhance our knowledge of the processes and microorganisms controlling soil As migration and CH4 emission., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023. Published by Elsevier Ltd.) more...- Published
- 2023
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112. Analysis of a super-transmission of SARS-CoV-2 omicron variant BA.5.2 in the outdoor night market.
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Luo M, Liu S, Zhu L, Wang F, Wu K, He H, Qi X, Pang Z, Dong X, Gong Z, and Yu M
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- Humans, Pandemics, Respiratory Aerosols and Droplets, SARS-CoV-2, COVID-19 epidemiology
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Introduction: The COVID-19 pandemic continues to ravage the world, and mutations of the SARS-CoV-2 continues. The new strain has become more transmissible. The role of aerosol transmission in the pandemic deserves great attention., Methods: In this observational study, we collected data from market customers and stallholders who had been exposed to the virus in the Qingkou night market on July 31 and were subsequently infected. We analyzed the possible infection zones of secondary cases and aerosol suspension time in ambient air. We described and analyzed the characteristics of the secondary cases and the transmission routes for customers., Results: The point source outbreak of COVID-19 in Qingkou night market contained a cluster of 131 secondary cases. In a less-enclosed place like the Qingkou night market, aerosols with BA.5.2 strain released by patients could suspend in ambient air up to 1 h 39 min and still be contagious., Conclusion: Aerosols with viruses can spread over a relatively long distance and stay in ambient air for a long time in a less enclosed space, but shorter than that under experimental conditions. Therefore, the aerosol suspension time must be considered when identifying and tracing close contact in outbreak investigations., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Luo, Liu, Zhu, Wang, Wu, He, Qi, Pang, Dong, Gong and Yu.) more...
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- 2023
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113. Implementing of infrared camouflage with thermal management based on inverse design and hierarchical metamaterial.
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Jiang X, Yuan H, He X, Du T, Ma H, Li X, Luo M, Zhang Z, Chen H, Yu Y, Zhu G, Yan P, Wu J, Zhang Z, and Yang J
- Abstract
Infrared camouflage is an effective technique to avoid many kinds of target detection by detectors in the infrared band. For a high-temperature environment, thermal management of selective emission is crucial to dissipate heat in the mid-infrared non-atmospheric window (5-8 μm). However, it still remains challenges for balancing infrared camouflage and thermal management. Here, we experimentally demonstrate a multilayer film structure (MFS) for infrared camouflage with thermal management. Combining the ideal emission spectrum and genetic algorithm (GA), the inverse-design MFS containing 7 layers of five materials (SiO
2 , Ge, ZnS, Pt and Au) has been designed. Based on the hierarchical metamaterial, the optimized MFS has high performance of infrared camouflage to against the lidar detection in the near-infrared band. The experimental results reveal the high compatible efficiency among thermal camouflage ( ε3-5μm = 0.21, ε8-14μm = 0.16), laser stealth ( ε1.06μm = 0.64, ε1.55μm = 0.90, ε10.6μm = 0.76) and thermal management ( ε5-8μm = 0.54). Therefore, the proposed MFSs are attractive as basic building block of selective emitter, for the application of advanced photonics such as radiative cooling, infrared camouflage, and thermal emission., (© 2023 the author(s), published by De Gruyter, Berlin/Boston.) more...- Published
- 2023
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114. Effects of climate and plant functional types on forest above-ground biomass accumulation.
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Chen X, Luo M, and Larjavaara M
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Background: Forest above-ground biomass (AGB) accumulation is widely considered an important tool for mitigating climate change. However, the general pattern of forest AGB accumulation associated with age and climate gradients across various forest functional types at a global scale have remained unclear. In this study, we compiled a global AGB data set and applied a Bayesian statistical model to reveal the age-related dynamics of forest AGB accumulation, and to quantify the effects of mean annual temperature and annual precipitation on the initial AGB accumulation rate and on the saturated AGB characterizing the limit to AGB accumulation., Results: The results of the study suggest that mean annual temperature has a significant positive effect on the initial AGB accumulation rate in needleleaf evergreen forest, and a negative effect in broadleaf deciduous forest; whereas annual precipitation has a positive effect in broadleaf deciduous forest, and negative effect in broadleaf evergreen forest. The positive effect of mean annual temperature on the saturated AGB in broadleaf evergreen forest is greater than in broadleaf deciduous forest; annual precipitation has a greater negative effect on the saturated AGB in deciduous forests than in evergreen forests. Additionally, the difference of AGB accumulation rate across four forest functional types is closely correlated with the forest development stage at a given climate., Conclusions: The contrasting responses of AGB accumulation rate to mean annual temperature and precipitation across four forest functional types emphasizes the importance of incorporating the complexity of forest types into the models which are used in planning climate change mitigation. This study also highlights the high potential for further AGB growth in existing evergreen forests., (© 2023. The Author(s).) more...
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- 2023
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115. Hierarchical porous biochar from kelp: Insight into self-template effect and highly efficient removal of methylene blue from water.
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Luo M, Wang L, Li H, Bu Y, Zhao Y, and Cai J
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- Water, Methylene Blue, Porosity, Adsorption, Charcoal, Coloring Agents, Kelp, Water Pollutants, Chemical analysis
- Abstract
Biochar is known to efficiently remove dyes especially for biochar with hierarchical pores and partial N-species. Here, a facile pyrolysis is used to yield N-doped biochar from kelp without additives, showing surface areas of 771 m
2 /g as temperature up to 1000 °C and hierarchical small-sized mesopores (2-4 nm) and wide meso-macropores (8-60 nm). A possible self-template mechanism from inorganics is proposed to form hierarchical pore architecture in biochar and used for methylene blue (MB) removal. Biochar pyrolyzed at 1000 °C is found to be efficient for MB removal with uptake of 379.8 mg/g under ambient conditions, one of the largest ever recorded uptakes for other biochar without activation, owing to synergistic effects of high surface areas, mesopores, and graphitized N-species. These results confirm that a facile pyrolysis for transformation of kelp into efficient dyes adsorbent is a cost-effective process for economic and environmental protection., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.) more...- Published
- 2023
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116. Characterizing genetic transmission networks among newly diagnosed HIV-1 infected individuals in eastern China: 2012-2016.
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Ding X, Chaillon A, Pan X, Zhang J, Zhong P, He L, Chen W, Fan Q, Jiang J, Luo M, Xia Y, Guo Z, and Smith DM
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- China epidemiology, Genotype, Homosexuality, Male, Humans, Male, Phylogeny, HIV Infections diagnosis, HIV Seropositivity, HIV-1 genetics, Sexual and Gender Minorities
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We aimed to elucidate the characteristics of HIV molecular epidemiology and identify transmission hubs in eastern China using genetic transmission network and lineage analyses. HIV-TRACE was used to infer putative relationships. Across the range of epidemiologically-plausible genetic distance (GD) thresholds (0.1-2.0%), a sensitivity analysis was performed to determine the optimal threshold, generating the maximum number of transmission clusters and providing reliable resolution without merging different small clusters into a single large cluster. Characteristics of genetically linked individuals were analyzed using logistic regression. Assortativity (shared characteristics) analysis was performed to infer shared attributes between putative partners. 1,993 persons living with HIV-1 were enrolled. The determined GD thresholds within subtypes CRF07_BC, CRF01_AE, and B were 0.5%, 1.2%, and 1.7%, respectively, and 826 of 1,993 (41.4%) sequences were linked with at least one other sequence, forming 188 transmission clusters of 2-80 sequences. Clustering rates for the main subtypes CRF01_AE, CRF07_BC, and B were 50.9% (523/1027), 34.2% (256/749), and 32.1% (25/78), respectively. Median cluster sizes of these subtypes were 2 (2-52, n = 523), 2 (2-80, n = 256), and 3 (2-6, n = 25), respectively. Subtypes in individuals diagnosed and residing in Hangzhou city (OR = 1.423, 95% CI: 1.168-1.734) and men who have sex with men (MSM) were more likely to cluster. Assortativity analysis revealed individuals were more likely to be genetically linked to individuals from the same age group (AIage = 0.090, P<0.001) and the same area of residency in Zhejiang (AIcity = 0.078, P<0.001). Additionally, students living with HIV were more likely to be linked with students than show a random distribution (AI student = 0.740, P<0.01). These results highlight the importance of Hangzhou City in the regional epidemic and show that MSM comprise the population rapidly transmitting HIV in Zhejiang Province. We also provide a molecular epidemiology framework for improving our understanding of HIV transmission dynamics in eastern China., Competing Interests: The authors have declared that no competing interests exist. more...
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- 2022
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117. From SARS to the Omicron variant of COVID-19: China's policy adjustments and changes to prevent and control infectious diseases.
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Luo M, Liu Q, Wang J, and Gong Z
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- China, Humans, Pandemics, Policy, SARS-CoV-2, COVID-19, Communicable Diseases epidemiology
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The COVID-19 pandemic has been the biggest public health crisis in a century. Since it was initially reported in 2019, the duration and intensity of its impacts are still in serious question around the world, and it is about to enter its third year. The first public health revolution failed to achieve its ultimate targets, as previously contained infectious diseases seem to have returned, and new infectious diseases continue to emerge. The prevention and control of infectious diseases is still a public health priority worldwide. After SARS, China adjusted a series of its infectious disease policies. In order to ensure the effectiveness and implementation of prevention and control interventions, the government should integrate the concept of public health. Perhaps we need a global public health system at the government level to fight the potential threat of infectious disease. This system could include multifaceted strategies, not just specific prevention and control interventions, and it could also be a comprehensive system to ensure unimpeded communication and cooperation as well as sustainable development. more...
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- 2022
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118. Index and First-Generation Cases in a COVID-19 Outbreak - Jilin Province, China, 2021.
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Cheng W, Zhao B, Chen E, Li G, Ma J, Cui Y, Xu C, Cui Y, Shen B, Luo M, Yin D, and Yao L
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What is already known on this topic?, Contact tracing and testing with isolated medical care of identified cases is a key strategy for interrupting chains of transmission of COVID-19 and reducing mortality associated with COVID-19. At the early phases of the COVID-19 pandemic, due to test capacity limitations, case finding often started from suspected cases., What is added by this report?, The index patient infected 74 individuals who were close contacts that were identified through contact tracing, and exposed individuals were monitored in quarantine with daily polymerase chain reaction (PCR) testing. All individuals were asymptomatic initially, but all PCR-positive individuals eventually developed symptoms. Infectivity was documented up to 8 days before being confirmed as a symptomatic case, approximately 4 days before turning PCR positive., What are the implications for public health practice?, During an outbreak, we suggest tracing close contacts from both PCR-positive individuals and suspected cases, rather than from suspected cases alone. Due to the long period of infectivity before turning PCR positive or developing symptoms, close contacts that had contact with a newly PCR positive case within 4 days should be judged as at risk of being infected; close contacts that had contact within 8 days of a newly symptomatic case should be judged as at risk being infected., (Copyright and License information: Editorial Office of CCDCW, Chinese Center for Disease Control and Prevention 2021.) more...
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- 2021
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119. COVID-19 Super Spreading Event Amongst Elderly Individuals - Jilin Province, China, January 2021.
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Yao L, Luo M, Jia T, Zhang X, Hou Z, Gao F, Wang X, Wu X, Cheng W, Li G, Lu J, Zhao B, Li T, Chen E, Yin D, and Huang B
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Summary: What is already known on this topic?, Clusters of COVID-19 cases often happened in small settings (e.g., families, offices, school, or workplaces) that facilitate person-to-person virus transmission, especially from a common exposure., What is added by this report?, On January 10 and 11, 2021, an individual gave three product promotional lectures in Tonghua City, Jilin Province, that ultimately led to a 74-case cluster of COVID-19. Our investigation determined the outbreak to be an import-related COVID-19 superspreading cluster event in which elderly, retired people were exposed to the infected individual during his promotional lectures, which were delivered in a confined space and lasted several hours., What are the implications for public health practice?, Routine activities, such as attending a lecture in a classroom, can provide an environment conducive to COVID-19 superspreading events because respiratory viruses can spread easily and widely. We suggest local government to strengthen infection control management, reduce unnecessary indoor large gathering activities, and promote wearing of masks, especially during wintertime in the north of China. Health education for elderly people should promote use of effective personal protection and emphasize the importance of wearing masks., (Copyright and License information: Editorial Office of CCDCW, Chinese Center for Disease Control and Prevention 2021.) more...
- Published
- 2021
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