Article
Engineering, Multidisciplinary
Delu Li, Xianming Deng, Changyi Li, Xiao Zhang, En Fang
Summary: This paper presents a feed-forward compensation strategy for matrix converters operating under abnormal input voltage conditions, aiming to compensate for unbalanced, non-sinusoidal, and instantaneous drop disturbances by adjusting the control system coefficients in real-time to ensure safe and stable operation.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Junna Yan, Zhonghua Zhang, Mingli Chen, Tao Lin, Ke Yuan
Summary: Urban regions are the main carbon emitters in China, and studying the driving factors between urban regions is important for reducing carbon emissions. This paper used improved models and analysis methods to study the driving factors of CO2 emissions spatial differences among four municipalities, and found that structural factors played an increasingly important role. Based on the results, policy implications applicable to cities were formulated.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Hospitality, Leisure, Sport & Tourism
Luiz Carlos De Santana Ribeiro, Gervasio Ferreira Dos Santos, Milene Takasago
Summary: This research examines the impact of tourism development on regional inequality in Brazil, and finds that domestic tourism expenditure has the highest economic impact in the Northeast region. The study suggests that domestic tourism helps to reduce regional inequality in Brazil, and policymakers should focus on improving the tourism sector, especially in poor regions.
CURRENT ISSUES IN TOURISM
(2023)
Article
Engineering, Electrical & Electronic
Duc Dung Le, Dong-Choon Lee
Summary: This letter proposes a modified topology of modular multilevel converter for medium-voltage applications, which aims to reduce ac-voltage fluctuation in the submodule capacitor at low-frequency operation. By inserting a novel structure of middle submodule between the upper and lower arms, the count of components is reduced, resulting in cost and power losses reduction. Moreover, the middle submodule can attenuate power fluctuation in the arms at low operating frequency by distributing high-frequency power components, significantly alleviating the SM capacitor voltage fluctuation without imposing common-mode voltage on the ac side.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Dai Van Bui, Honnyong Cha
Summary: This letter proposes a PWM scheme based on phase-shift modulation for the 4P-IPOS converter. It investigates the operation with a dual-output configuration and achieves natural output voltages and inductor currents balancing without any extra components or dedicated control. The suggested scheme improves performance compared to the conventional PWM scheme, reducing input current ripple significantly at high voltage gain. An 800-W prototype of the 4P-IPOS converter was built and tested to verify its performance.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Andrea Petroni, Gaetano Scarano, Roberto Cusani, Mauro Biagi
Summary: A modulation precoding scheme is proposed to maximize the minimum distance between received symbols in indoor visible light communication, simultaneously addressing communication and illumination issues. By operating adaptive power allocation on LEDs and optimizing constellation, the scheme maintains a low symbol error probability even in strong interference scenarios.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Automation & Control Systems
Zheng Gong, Peng Dai, Jingjie Li, Dahui Su, Xianjin Su
Summary: A new indirect matrix converter (IMC) topology with two insulated gate bipolar transistors (IGBT) in the dc-link is proposed to suppress the common-mode voltage (CMV). Two new space vector modulation (SVM) strategies are redesigned to control this topology. Comparative simulation and experimental research validate the effectiveness of the proposed strategy in reducing CMV and demonstrate that the new IMC system can maintain satisfactory CMV suppression performance when feeding an induction motor.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Biochemical Research Methods
Aastha K. Dharia, Adam Gardi, Amanda K. Vogel, Aviroop Dutt-Mazumder, Chandramouli Krishnan
Summary: The study demonstrates that TMS-induced motor evoked torque can reliably measure corticospinal excitability in quadriceps muscles. Normalizing the motor evoked torque to resting twitch torque yields the best reliability.
JOURNAL OF NEUROSCIENCE METHODS
(2021)
Article
Engineering, Electrical & Electronic
Angeles Simarro, Victor M. Garcia-Molla, F. J. Martinez-Zaldivar, Alberto Gonzalez
Summary: This paper presents three algorithms that achieve ML performance for MIMO-GSM systems. The first algorithm utilizes different strategies, including preprocessing sorting and clipping, to reduce computational complexity. The other two algorithms can only be used with clipping, but they show significant savings in computational cost.
Article
Automation & Control Systems
Feiming Liu, Jianping Xu, Zhengge Chen, Rui Huang, Xin Chen
Summary: This article proposes a zero-voltage switching modulation scheme with constant switching frequency and simple real-time calculation to minimize the rms inductor current. By using a 2-D look-up table within a small range of input and output voltage, the proposed scheme achieves minimized inductor current. The derived zero-voltage switching conditions are accurate and simple, providing additional assistance in minimizing the rms inductor current.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Energy & Fuels
Bo Zhang, Jin Huang, Yongfeng Song, Xinbo Liu, Jiahui Ren, Chengwei Kang, Yingtao Ma, Shijie Sun, Lijun Diao
Summary: This paper studies the input-voltage and output-current equalization characteristics of a Boost + LLC modular ISOP converter based on the small-signal model. The experimental results show that the ISOP system composed of a Boost + LLC cascaded module has excellent voltage and current self-equalization performance.
Article
Engineering, Multidisciplinary
Mena ElMenshawy, Ahmed Massoud
Summary: This paper presents a modular Input-Series Output-Parallel (ISOP) DC-DC converter for LS-EVs fast chargers, which achieves uniform power-sharing through direct output current sharing control, ensuring stability without the need for input voltage sharing loops.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Wenrui Yan, Bingxian Hao, Meijuan Ma, Yun Wang
Summary: This paper presents a high reliability low dropout linear regulator with high voltage tolerance. It uses an open loop structure and is applied to the feedforward response portion of the power tube gate to enhance the transient response of the LDO. The simulation results show that the proposed LDO has good line regulation and supply voltage rejection ratio under high voltage input.
IEICE ELECTRONICS EXPRESS
(2022)
Article
Neurosciences
Ladan Moheimanian, Sivylla E. Paraskevopoulou, Markus Adamek, Gerwin Schalk, Peter Brunner
Summary: The study suggests that moment-to-moment fluctuations in cortical excitability play a crucial role in determining whether cortical responses to sensory stimulation can successfully result in a behavioral response when individuals are presented with auditory stimuli close to perceptual-level threshold. The likelihood of cortical activity decreased from auditory cortex to motor cortex for presentations that did not result in behavioral responses, indicating a correlation with reduced local cortical excitability.
Article
Environmental Sciences
Jiaxin Lu, Feifeng Liu, Jingyi Sun, Yingjie Miao, Quanhua Liu
Summary: This paper focuses on the multi-target parameter estimation problem of multiple-input multiple-output (MIMO) radar with widely separated antennas on moving platforms. The well-known expectation maximization (EM) method is used to address the superimposed signals caused by multiple targets, and the extended Q function considering signal-to-noise ratio (SNR) fluctuations caused by antenna separation is introduced. To reduce computational complexity, gradient descent and weighted iterative least squares (WILS) algorithm are used. Additionally, the Cramer-Rao bound (CRB) in non-ideal environments is derived.
Article
Neurosciences
Cheryl Clarkson, Roy M. Smeal, Meredith G. Hasenoehrl, John A. White, Maria E. Rubio, Karen S. Wilcox
EXPERIMENTAL NEUROLOGY
(2020)
Article
Neurosciences
Pavel Sanda, Paola Malerba, Xi Jiang, Giri P. Krishnan, Jorge Gonzalez-Martinez, Eric Halgren, Maxim Bazhenov
Summary: The study reveals a complex bidirectional interaction between sharp wave-ripples in the hippocampus and slow oscillations in the cortex during slow wave sleep, with their precise timing influencing different functions in memory consolidation. Early hippocampal ripples influence transitions to Up-state, while cortical Up-states control occurrence of the later ripples, impacting transitions to Down-state.
Article
Clinical Neurology
Katharine C. Simon, Paola Malerba, Neal Nakra, Amy Harrison, Sara C. Mednick, Marni Nagel
Summary: This study measured slow oscillations in Duchenne and Becker muscular dystrophy male patients and found a significant decline in slow oscillation density with age. When patients were grouped by age, a decline in the rate and amplitude of slow oscillations was observed.
Article
Biochemical Research Methods
Jacob F. Norman, Bahar Rahsepar, Jad Noueihed, John A. White
Summary: The research optimized a method for coexpressing two fluorescent proteins across multiple brain regions and mouse lines. The double-virus method showed significantly higher coexpression compared to the standard single-virus method, providing efficient population activity recording and neuronal subpopulation identification.
JOURNAL OF NEUROSCIENCE METHODS
(2021)
Article
Optics
Linli Shi, Ying Jiang, Fernando R. Fernandez, Guo Chen, Lu Lan, Heng-Ye Man, John A. White, Ji-Xin Cheng, Chen Yang
Summary: The development of a tapered fiber optoacoustic emitter (TFOE) has enabled high-precision ultrasound stimulation at a spatial resolution of 39.6 μm, allowing for optoacoustic activation of single neurons or subcellular structures. The TFOE technology also facilitates direct measurement of the electrical response of single neurons to acoustic stimulation, revealing cell-type-specific responses of excitatory and inhibitory neurons to acoustic stimulation. TFOE shows promise as a non-genetic technology for single-cell and sub-cellular modulation, shedding new insights into the mechanism of ultrasound neurostimulation.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Neurosciences
Fernando R. Fernandez, Guillem Via, Carmen C. Canavier, John A. White
Summary: The inhibitory connectivity and kinetics of two subpopulations of interneurons in the medial entorhinal cortex (mEC), Pvalb(+) and Sst(+), were found to be different from those in the neocortex. Pvalb(+) cells exhibited more common and stronger inhibitory connections, while Sst(+) cells had fewer inhibitory connections. Furthermore, the synaptic connections between Pvalb(+) cells and excitatory cells were more likely and faster compared to those between Sst(+) cells and excitatory cells.
Article
Biochemistry & Molecular Biology
Tengiz Oniani, Laura Vinnenberg, Rahul Chaudhary, Julian A. Schreiber, Kathrin Riske, Brandon Williams, Hans-Christian Pape, John A. White, Anna Junker, Guiscard Seebohm, Sven G. Meuth, Petra Hundehege, Thomas Budde, Mehrnoush Zobeiri
Summary: This study investigates the effects of MS-related factors on HCN channels and finds that HCN channels are not directly influenced by trace metals and divalent cation chelators.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Multidisciplinary Sciences
Hamid Niknazar, Paola Malerba, Sara C. Mednick
Summary: Slow oscillations (SOs) play a critical role in strengthening memories during nonrapid eye movement (NREM) sleep. NREM sleep generally has weak neural communication, but SOs provide two windows of enhanced communication. Communication peaks are significantly higher when SOs are coupled with sleep spindles. Global, long-range communication during SOs promotes sleep-dependent consolidation of episodic memories. Peaks of information flow are significantly correlated with memory improvement, indicating predictive validity of our measurements. SOs act as a gating mechanism for large-scale neural communication, facilitating systems consolidation and long-term memory formation during a low connectivity sleep state.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Clinical Neurology
Paola Malerba, Lauren Whitehurst, Sara C. Mednick
Summary: Sleep spindles play an important role in sleep and cognitive functions, especially in the coordination with slow oscillations (SOs) for memory reactivation. This study analyzes the characteristics of spindles and their relation to SOs in different sleep stages and brain regions. Different types of spindles are identified using clustering analysis. The findings suggest a non-uniform participation of spindles in SO-spindle complexes, which has implications for understanding the mechanisms of memory reactivation.
Review
Clinical Neurology
Giada Milani, Annibale Antonioni, Andrea Baroni, Paola Malerba, Sofia Straudi
Summary: Current clinical practice has not effectively utilized EEG measurements in predicting post-stroke recovery in stroke patients. However, research suggests that certain EEG measures show promise in predicting upper limb motor outcome after stroke. This literature review examined various quantitative and qualitative EEG-based measures in relation to stroke timeframe and experimental tasks, and identified event-related measures as the most promising for prediction.
Article
Biology
Monika Shpokayte, Olivia McKissick, Xiaonan Guan, Bingbing Yuan, Bahar Rahsepar, Fernando R. Fernandez, Evan Ruesch, Stephanie L. Grella, John A. White, X. Shawn Liu, Steve Ramirez
Summary: The hippocampus contains distinct populations of neurons responsible for processing positive and negative memories, which can be distinguished by their molecular, cellular, and projection-specific features. Recent studies have revealed cellular heterogeneity along the hippocampal axis, with the ventral hippocampus playing a significant role in emotion and valence processing. By combining different techniques, the researchers visualized valence-specific memory engrams in the ventral hippocampus, and found that these cells display different transcriptional programs and DNA methylation landscapes compared to neutral memory cells. Additionally, they demonstrated that stimulating the ventral hippocampus terminals projecting to certain brain regions can drive preference and avoidance behaviors. This study highlights the importance of the ventral hippocampus in processing appetitive and aversive memories.
COMMUNICATIONS BIOLOGY
(2022)
Article
Biochemical Research Methods
Guillem Via, Roman Baravalle, Fernando R. Fernandez, John A. White, Carmen C. Canavier
Summary: Theta and gamma oscillations in the hippocampus are important for memory encoding and retrieval. Recent research has shown that the intrinsic fast gamma mechanism in the medial entorhinal cortex can be recruited by optogenetic stimulation at theta frequencies, suggesting a contribution of interneuronal network gamma (ING). Model network calibration revealed that networks with gap junctions exhibited theta-nested high frequency oscillations similar to those observed experimentally.
PLOS COMPUTATIONAL BIOLOGY
(2022)
Article
Biology
Bahar Rahsepar, Jacob F. Norman, Jad Noueihed, Benjamin Lahner, Melanie H. Quick, Kevin Ghaemi, Aashna Pandya, Fernando R. Fernandez, Steve Ramirez, John A. White
Summary: This study examines the role of theta oscillations in memory processes in the hippocampus. The researchers found that stimulating engram neurons at specific phases of theta oscillations leads to more effective behavioral recall. This phase-specific stimulation also increases the coupling between gamma and theta oscillations in the hippocampus.
Meeting Abstract
Clinical Neurology
Hamid Niknazar, Paola Malerba, Sara Mednick