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1,598 Results Found

  • Article
  • Open Access
6 Citations
3,760 Views
30 Pages

Zero-TCE: Zero Reference Tri-Curve Enhancement for Low-Light Images

  • Chengkang Yu,
  • Guangliang Han,
  • Mengyang Pan,
  • Xiaotian Wu and
  • Anping Deng

12 January 2025

Addressing the common issues of low brightness, poor contrast, and blurred details in images captured under conditions such as night, backlight, and adverse weather, we propose a zero-reference dual-path network based on multi-scale depth curve estim...

  • Article
  • Open Access
10 Citations
4,559 Views
14 Pages

28 March 2024

A novel zero-reference low-light image-enhancement approach based on noise estimation (ZLEN) is proposed to mitigate noise interference in image-enhancement processes, while the tenets of zero-reference and lightweight network architecture are mainta...

  • Article
  • Open Access
4 Citations
1,761 Views
21 Pages

Wavelet-Guided Zero-Reference Diffusion for Unsupervised Low-Light Image Enhancement

  • Yuting Peng,
  • Xiaojun Guo,
  • Mengxi Xu,
  • Bing Ding and ,
  • Bei Sun and
  • Shaojing Su
  • + 1 author+ 0 author

16 November 2025

Low-light image enhancement (LLIE) remains a challenging task due to the scarcity of paired training data and the complex signal-dependent noise inherent in low-light scenes. To address these issues, this paper proposes a fully unsupervised framework...

(This article belongs to the Topic International Conference on Autonomous Unmanned Systems (5th ICAUS 2025))
  • Article
  • Open Access
6 Citations
3,374 Views
19 Pages

Fast, Zero-Reference Low-Light Image Enhancement with Camera Response Model

  • Xiaofeng Wang,
  • Liang Huang,
  • Mingxuan Li,
  • Chengshan Han and ,
  • Xin Liu and
  • Ting Nie
  • + 1 author+ 0 author

2 August 2024

Low-light images are prevalent in intelligent monitoring and many other applications, with low brightness hindering further processing. Although low-light image enhancement can reduce the influence of such problems, current methods often involve a co...

(This article belongs to the Collection Applications of Convolutional Neural Networks in Imaging and Sensing)
  • Article
  • Open Access
4 Citations
3,134 Views
21 Pages

Efficient Gamma-Based Zero-Reference Deep Curve Estimation for Low-Light Image Enhancement

  • Huitao Zhao,
  • Shaoping Xu,
  • Liang Peng,
  • Hanyang Hu and
  • Shunliang Jiang

30 June 2025

In recent years, the continuous advancement of deep learning technology and its integration into the domain of low-light image enhancement have led to a steady improvement in enhancement effects. However, this progress has been accompanied by an incr...

(This article belongs to the Section Computing and Artificial Intelligence)
  • Article
  • Open Access
7 Citations
5,419 Views
16 Pages

3 December 2023

Due to problems such as the shooting light, viewing angle, and camera equipment, low-light images with low contrast, color distortion, high noise, and unclear details can be seen regularly in real scenes. These low-light images will not only affect o...

(This article belongs to the Special Issue AI-Driven Sensing for Image Processing and Recognition)
  • Article
  • Open Access
1 Citations
3,973 Views
18 Pages

Zero-Reference Depth Curve Estimation-Based Low-Light Image Enhancement Method for Coating Workshop Inspection

  • Jiaqi Liu,
  • Shanhui Liu,
  • Wuyang Zhou,
  • Huiran Ren and ,
  • Wanqiu Zhao and
  • Zheng Li
  • + 1 author+ 0 author

17 April 2025

To address the challenges of poor image quality and low detection accuracy in low-light environments during coating workshop inspections, this paper proposes a low-light image enhancement method based on zero-reference depth curve estimation, termed...

(This article belongs to the Section Surface Engineering for Energy Harvesting, Conversion, and Storage)
  • Article
  • Open Access
36 Citations
5,650 Views
10 Pages

22 August 2019

Tuning nonlinearity of the laser is the main source of deterioration of the spatial resolution in optical frequency-domain reflectometry (OFDR) system. In this paper, we develop methods for tuning nonlinearity correction in an OFDR system from the as...

(This article belongs to the Special Issue Fiber Optic Sensors and Applications)
  • Article
  • Open Access
2 Citations
4,134 Views
25 Pages

Energy Consumption in Mexican Homes: Using a Reference Building as a Launchpad for Achieving Nearly Zero Energy

  • Carlos A. Espino-Reyes,
  • Naghelli Ortega-Avila,
  • Jorge Lucero-Álvarez and
  • Norma A. Rodríguez-Muñoz

The residential sector accounts for over a third of the world’s energy use. Even though this ratio is lower in Mexico, there is a pressing housing deficit, especially regarding low-cost homes. This research aimed to create a reference building...

(This article belongs to the Special Issue Building Resilience in Urban Areas: Exploring the Impact of Material Properties and Building Design)
  • Article
  • Open Access
14 Citations
4,024 Views
14 Pages

Improved Lightweight Zero-Reference Deep Curve Estimation Low-Light Enhancement Algorithm for Night-Time Cow Detection

  • Zijia Yu,
  • Yangyang Guo,
  • Liyuan Zhang,
  • Yi Ding and ,
  • Gan Zhang and
  • Dongyan Zhang
  • + 1 author+ 0 author

With the advancement of agricultural intelligence, dairy-cow farming has become a significant industry, and the application of computer vision technology in the automated monitoring of dairy cows has also attracted much attention. However, most of th...

(This article belongs to the Section Farm Animal Production)
  • Article
  • Open Access
15 Citations
6,730 Views
14 Pages

A More Effective Zero-DCE Variant: Zero-DCE Tiny

  • Weiwen Mu,
  • Huixiang Liu,
  • Wenbai Chen and
  • Yiqun Wang

1 September 2022

The purpose of Low Illumination Image Enhancement (LLIE) is to improve the perception or interpretability of images taken in low illumination environments. This work inherits the work of Zero-Reference Deep Curve Estimation (Zero-DCE) and proposes a...

(This article belongs to the Special Issue Advances in Image Enhancement)
  • Article
  • Open Access
804 Views
18 Pages

10 October 2025

The rapid growth of road freight has increased urban carbon emissions, but decarbonization in this sector remains slow compared to other areas. This study examines city-level road freight decarbonization, focusing on extreme values, with the goal of...

(This article belongs to the Section Sustainable Urban and Rural Development)
  • Article
  • Open Access
1 Citations
944 Views
19 Pages

23 May 2025

Precise speed estimation of sensorless induction motor (SIM) drives remains a significant challenge, particularly at zero and very low speeds. This paper proposes a mathematically modeled and enhanced stator current-based Model Reference Adaptive Sys...

(This article belongs to the Special Issue Artificial Neural Networks and Dynamic Control Systems)
  • Feature Paper
  • Article
  • Open Access
4 Citations
3,223 Views
11 Pages

3 January 2023

This study aims to institutionalize an evaluation methodology to assess water-source heat pumps (WSHPs) when designing a zero-energy building. Thus, regions where zero-energy buildings were designed were subdivided into 66 sub-regions, thereby standa...

(This article belongs to the Section A: Sustainable Energy)
  • Article
  • Open Access
4,037 Views
33 Pages

A Novel Approach to Determine Multi-Tiered Nearly Zero-Energy Performance Benchmarks Using Probabilistic Reference Buildings and Risk Analysis Approaches

  • Damien Gatt,
  • Charles Yousif,
  • Maurizio Cellura,
  • Francesco Guarino and ,
  • Kenneth Scerri and
  • Ilenia Tinnirello
  • + 1 author+ 0 author

4 January 2024

The Energy Performance of Buildings Directive (EPBD) mandates European Union Member States (MS) to conduct cost-optimal studies using the national calculation methodology (NCM), typically through non-calibrated asset-rating software. Nearly zero-ener...

(This article belongs to the Special Issue Advances in Sustainability Research at the University of Malta)
  • Article
  • Open Access
424 Views
21 Pages

Bio-Inspired Low-Light Image Enhancement with Large Kernel Convolution and Attention

  • Xiaohu Liu,
  • Hongke Pan,
  • Xiaogang Yu,
  • Jun Xi and
  • Yujun Peng

2 September 2026

Nighttime driving safety remains a critical challenge in modern transportation systems: insufficient ambient lighting significantly degrades visual perception quality, adversely affecting both human drivers and advanced driver-assistance systems (ADA...

(This article belongs to the Special Issue Bionic Vision Applications and Validation)
  • Article
  • Open Access
771 Views
15 Pages

Discrete Switching Sequence Control for Universal Current Tracking in Wind Power Converters

  • Jiawei Yu,
  • Xuetong Wang,
  • Guangqi Li,
  • Wenzhe Hao and ,
  • Chao Luo and
  • Zhiyong Dai
  • + 1 author+ 0 author

24 November 2025

With increasing wind power penetration in modern grids, high-performance current control of converters is essential for efficient power transfer, harmonic reduction, and system stability. A novel discrete switching sequence control (dSSC) is proposed...

(This article belongs to the Special Issue New Trends in Power Electronics for Renewable Energy and Power Systems)
  • Article
  • Open Access
783 Views
25 Pages

29 April 2026

Reference-driven humanoid motion tracking aims to reproduce a source motion on a target humanoid while preserving physical executability under actuation limits and changing contact conditions. The problem becomes particularly challenging for dynamic...

(This article belongs to the Topic Modeling, Stability, and Control of Dynamic Systems and Their Applications)
  • Article
  • Open Access
522 Views
25 Pages

16 July 2026

Under the IMO net-zero framework, a GHG carbon-pricing mechanism must not only generate an effective price signal for emission reduction, but also address the fair distribution of carbon revenues among different types of member states. In view of the...

  • Article
  • Open Access
5 Citations
7,749 Views
19 Pages

5 March 2024

Voltage standards are widely used to transfer volts from Josephson voltage standards (JVSs) at national metrology institutes (NMIs) into calibration labs to maintain the volts and to transfer them to test equipment at production lines. Therefore, com...

  • Article
  • Open Access
314 Views
33 Pages

11 September 2026

Landing underactuated quadrotors on inclines is challenging as sudden contact transients convert translational kinetic energy into critical edge-tipping moments. Conventional controllers struggle to mitigate these sub-second impacts without computati...

(This article belongs to the Special Issue Advanced Nonlinear and Learning-Based Control Techniques for Complex Dynamical Systems, 3rd Edition)
  • Article
  • Open Access
15 Citations
6,263 Views
28 Pages

20 January 2023

The need for efficient buildings to contribute to sustainable development has led to the proposal of goals and regulations in different countries linked to net zero energy objectives, following approaches specific to their regions. Such regulations a...

(This article belongs to the Special Issue Advanced Studies in Nearly Zero-Energy Buildings and Optimal Design)
  • Article
  • Open Access
1 Citations
1,390 Views
17 Pages

Zero-3DCE: A Low-Light Video Enhancement for More Robust Computer Vision Tasks

  • Mpilo Mbulelo Tatana,
  • Rito Clifford Maswanganyi and
  • Philani Khumalo

9 December 2025

Low-light video enhancement remains a challenge, specifically due to the challenging task of acquiring paired low-light video data. This paper proposes Zero-3DCE, a 3D version of Zero-DCE. Zero-3DCE differs from Zero-DCE by (i) introducing 3D separab...

  • Article
  • Open Access
37 Citations
8,521 Views
13 Pages

Optimal Learning and Self-Awareness Versus PDI

  • Brendon Smeresky,
  • Alex Rizzo and
  • Timothy Sands

11 January 2020

This manuscript will explore and analyze the effects of different paradigms for the control of rigid body motion mechanics. The experimental setup will include deterministic artificial intelligence composed of optimal self-awareness statements togeth...

(This article belongs to the Special Issue Algorithms for PID Controller 2019)
  • Article
  • Open Access
12 Citations
3,970 Views
18 Pages

19 April 2024

Low-light image enhancement is very significant for vision tasks. We introduce Low-light Image Enhancement via Deep Learning Network (LLE-NET), which employs a deep network to estimate curve parameters. Cubic curves and gamma correction are employed...

(This article belongs to the Special Issue Advanced Numerical and Computational Methods for Engineering and Applied Mathematical Problems)
  • Article
  • Open Access
2 Citations
1,619 Views
19 Pages

RICNET: Retinex-Inspired Illumination Curve Estimation for Low-Light Enhancement in Industrial Welding Scenes

  • Chenbo Shi,
  • Xiangyu Zhang,
  • Delin Wang,
  • Changsheng Zhu and ,
  • Aiping Liu,
  • Chun Zhang and
  • Xiaobing Feng
  • + 2 authors+ 0 author

21 August 2025

Feature tracking is essential for welding crawler robots’ trajectory planning. As welding often occurs in dark environments like pipelines or ship hulls, the system requires low-light image capture for laser tracking. However, such images typic...

(This article belongs to the Section Optical Sensors)
  • Article
  • Open Access
805 Views
18 Pages

2 December 2025

To support national carbon neutrality goals, enhancing the thermal insulation of building envelopes has emerged as a crucial strategy in reducing building energy consumption. This study conducted a detailed quantitative analysis of energy performance...

(This article belongs to the Special Issue Building Retrofits and Zero Energy Building for Carbon Reduction)
  • Article
  • Open Access
48 Citations
8,288 Views
19 Pages

27 September 2019

Research on a terrain-blind walking control that can walk stably on unknown and uneven terrain is an important research field for humanoid robots to achieve human-level walking abilities, and it is still a field that needs much improvement. This pape...

(This article belongs to the Special Issue Sensors and Robot Control)
  • Article
  • Open Access
11 Citations
3,229 Views
14 Pages

Combined Temperature Compensation Method for Closed-Loop Microelectromechanical System Capacitive Accelerometer

  • Guowen Liu,
  • Yu Liu,
  • Zhaohan Li,
  • Zhikang Ma and ,
  • Xiao Ma,
  • Xuefeng Wang,
  • Xudong Zheng and
  • Zhonghe Jin
  • + 3 authors+ 0 author

17 August 2023

This article describes a closed-loop detection MEMS accelerometer for acceleration measurement. This paper analyzes the working principle of MEMS accelerometers in detail and explains the relationship between the accelerometer zero bias, scale factor...

(This article belongs to the Special Issue MEMS Inertial Device)
  • Article
  • Open Access
1 Citations
642 Views
16 Pages

An FPGA-Based DDS-Synchronized Quadrature Lock-In Module for Sweep-Field Demodulation in a Single-Beam SERF Magnetometer

  • Dongjing Zhang,
  • Xiaojian Hao,
  • Rui Jia,
  • Xinying Yu and ,
  • Yifei Fu,
  • Nengqiang Ma and
  • Zheming Cui
  • + 2 authors+ 0 author

17 June 2026

Sweep-field operation in a single-beam spin-exchange relaxation-free (SERF) magnetometer requires stable extraction of the dispersion zero-crossing. A frequency mismatch between the modulation signal and the demodulation references, or an unsuitable...

(This article belongs to the Special Issue Applications of Sensors Based on Embedded Systems)
  • Article
  • Open Access
14 Citations
4,934 Views
36 Pages

Towards Nearly-Zero Energy in Heritage Residential Buildings Retrofitting in Hot, Dry Climates

  • Hanan S. S. Ibrahim,
  • Ahmed Z. Khan,
  • Yehya Serag and
  • Shady Attia

16 December 2021

Retrofitting “nearly-zero energy” heritage buildings has always been controversial, due to the usual association of the “nearly-zero energy” target with high energy performance and the utilization of renewable energy sources i...

  • Article
  • Open Access
4 Citations
2,430 Views
16 Pages

Simple Voltage Balancing Control of Four-Level Inverter

  • Shi Su,
  • Qingyang Xie,
  • Mengyuan Wang,
  • Yu Wang and ,
  • Jianfei Chen and
  • Zhikun Hu
  • + 1 author+ 0 author

30 September 2024

Multilevel inverters with improved voltage quality are widely used in applications such as motor control and electric vehicles. The four-level active neutral point clamped (4L-ANPC) inverter effectively meets the demands for high power density and lo...

(This article belongs to the Section Power Electronics)
  • Article
  • Open Access
37 Citations
8,221 Views
22 Pages

27 February 2015

In this paper, we propose a new Zero Direct Power Control (ZDPC) technique for active compensation of harmonics and reactive power, using shunt active power filter (SAPF), based on cancellation of instantaneous active and reactive power disturbances...

  • Article
  • Open Access
7 Citations
3,157 Views
16 Pages

Control Error Convergence Using Lyapunov Direct Method Approach for Mixed Fractional Order Model Reference Adaptive Control

  • Gustavo E. Ceballos Benavides,
  • Manuel A. Duarte-Mermoud and
  • Lisbel Bárzaga Martell

This paper extends Lyapunov stability theory to mixed fractional order direct model reference adaptive control (FO-DMRAC), where the adaptive control parameter is of fractional order, and the control error model is of integer order. The proposed appr...

(This article belongs to the Special Issue Continuous/Discrete-Time Fractional Systems: Modelling, Design and Estimation)
  • Article
  • Open Access
5 Citations
2,489 Views
14 Pages

This paper proposes an improved zero-current distortion compensation (IZCDC) method for the Vienna rectifier. The conventional zero-current distortion compensation (ZCDC) method modifies the reference voltages by adding an offset voltage to compensat...

(This article belongs to the Section Power Electronics)
  • Article
  • Open Access
1 Citations
1,889 Views
17 Pages

1 December 2024

Generalized predictive control (GPC) became one of the most popular and useful control strategies for academic and industry applications. An augmented model is applied to predict the future plant responses. This augmented model can be designed to emb...

(This article belongs to the Special Issue Energy, Electrical and Power Engineering: 3rd Edition)
  • Article
  • Open Access
4 Citations
2,635 Views
15 Pages

23 July 2024

Zero-energy buildings have attracted great attention in China. Limited research about typical high-rise, zero-energy residential buildings in China was found. To figure out the potential of zero-energy buildings in northern China, a techno-economic a...

(This article belongs to the Section Green Building)
  • Review
  • Open Access
34 Citations
9,312 Views
28 Pages

Systematic Literature Review on Variables Impacting Organization’s Zero Accident Vision in Occupational Safety and Health Perspectives

  • Mohamad Azrin Ahamad,
  • Kadir Arifin,
  • Azlan Abas,
  • Mahfudz Mahfudz and ,
  • Muhammad Basir Cyio,
  • Muhammad Khairil,
  • Muhammad Nur Ali,
  • Ilyas Lampe and
  • Muhammad Ahsan Samad
  • + 4 authors+ 0 author

21 June 2022

The zero-accident vision has sparked debate in the fields of occupational safety and health. While many organizations and policymakers have successfully implemented the zero-accident vision, numerous notable occupational safety and health scholars fr...

(This article belongs to the Special Issue Environmental Sustainability in IR 4.0)
  • Article
  • Open Access
10 Citations
3,452 Views
18 Pages

Power Control and Fault Ride-Through Capability Analysis of Cascaded Star-Connected SVG under Asymmetrical Voltage Conditions

  • Muxuan Xiao,
  • Feng Wang,
  • Zhixing He,
  • Honglin Ouyang and ,
  • Renyifan Hao and
  • Qianming Xu
  • + 1 author+ 0 author

19 June 2019

The cascaded H-bridge static var generator (SVG) has been employed to provide reactive power and regulate grid voltages for many years because of its good modularity, easy scalability, and improved harmonic performance. A novel cluster-balancing powe...

(This article belongs to the Section F: Electrical Engineering)
  • Article
  • Open Access
6 Citations
4,527 Views
17 Pages

Digital Control of a Buck Converter Based on Input-Output Linearization. An Interpretation Using Discrete-Time Sliding Control Theory

  • Enric Vidal-Idiarte,
  • Carlos Restrepo,
  • Abdelali El Aroudi,
  • Javier Calvente and
  • Roberto Giral

17 July 2019

This paper presents the analysis and design of a PWM nonlinear digital control of a buck converter based on input-output linearization. The control employs a discrete-time bilinear model of the power converter for continuous conduction mode operation...

(This article belongs to the Special Issue Sliding Mode Control of Power Converters in Renewable Energy Systems)
  • Article
  • Open Access
5 Citations
2,338 Views
12 Pages

15 April 2022

In some key areas, fault-tolerant control is usually needed in order to enable the motor to operate continuously in fault mode. Given that it is difficult to detect the zero-sequence current of the open winding permanent magnet synchronous motor afte...

  • Article
  • Open Access
4 Citations
4,529 Views
15 Pages

Tracking Control with Zero Phase-Difference for Linear Switched Reluctance Machines Network

  • Bo Zhang,
  • J.F. Pan,
  • Jianping Yuan,
  • Wufeng Rao and ,
  • Li Qiu,
  • Jianjun Luo and
  • Honghua Dai
  • + 2 authors+ 0 author

8 July 2017

This paper discusses the control of the linear switched reluctance machines (LSRMs) network for the zero phase-difference tracking to a sinusoidal reference. The dynamics of each LSRM is derived by online system identification and modeled as a second...

(This article belongs to the Special Issue Networked and Distributed Control Systems)
  • Review
  • Open Access
653 Views
21 Pages

Stable, homogeneous, and internationally comparable gravimetric reference systems are fundamental components of modern geodetic infrastructure, supporting height system realization, geoid modeling, geodynamics, and the integration of national gravity...

  • Article
  • Open Access
2 Citations
3,699 Views
14 Pages

11 September 2019

This paper presents the efficiency improvement in a speed closed-loop controlled permanent magnet synchronous machine (PMSM) sensorless drive. The drive efficiency can be improved by minimizing the inverter and the PMSM losses. These can be influence...

(This article belongs to the Special Issue Energy Efficiency in Electric Devices, Machines and Drives)
  • Article
  • Open Access
382 Views
18 Pages

Experimental Detection of ∆x Variations on the Complex s-Plane Based on a Michelson Interferometer

  • Romel Rubicel Flores Gámez,
  • José Trinidad Guillen Bonilla,
  • Héctor Guillen Bonilla,
  • Alex Guillen Bonilla and ,
  • Cuauhtémoc Acosta Lúa,
  • Maricela Jiménez Rodríguez,
  • Mónica Vázquez Gutiérrez and
  • María Eugenia Sánchez Morales
  • + 3 authors+ 0 author

17 September 2026

In this paper, a Michelson interferometer was employed to generate interference patterns, the modulated function was extracted by digital filtering and the Laplace transform was subsequently applied to obtain the complex function F(s)=F(σ+&omeg...

(This article belongs to the Section Applied Physics)
  • Article
  • Open Access
4 Citations
3,010 Views
27 Pages

The quantum vacuum fluctuations of a neutral scalar field induced by background zero-range potentials concentrated on a flat hyperplane of co-dimension 1 in (d+1)-dimensional Minkowski spacetime are investigated. Perfectly reflecting and semitranspar...

(This article belongs to the Special Issue The Casimir Effect: From a Laboratory Table to the Universe)
  • Article
  • Open Access
5 Citations
2,841 Views
11 Pages

Background: The number of contingent valuation (CV) studies in dental medicine using willingness-to-pay (WTP) methodology has substantially increased in recent years. Missing values due to absent information (i.e., missingness) or false information (...

(This article belongs to the Section Oral Health)
  • Article
  • Open Access
3,218 Views
30 Pages

BoxesZero: An Efficient and Computationally Frugal Dots-and-Boxes Agent

  • Xuefen Niu,
  • Qirui Liu,
  • Wei Chen,
  • Yujiao Zheng and
  • Zhanggen Jin

9 March 2025

In recent years, deep reinforcement learning (DRL) has made significant progress in the field of games. A prime example is AlphaZero, which, despite the formidable capabilities showcased, deters many from exploring its potential because of its demand...

(This article belongs to the Section Information Theory, Probability and Statistics)
  • Article
  • Open Access
14 Citations
4,818 Views
27 Pages

Design Optimization of Energy-Efficient Residential Buildings in Morocco

  • Karim Boumlik,
  • Rafik Belarbi,
  • Mohammed Ahachad,
  • Mustapha Mahdaoui and ,
  • Hassan Radoine and
  • Moncef Krarti
  • + 1 author+ 0 author

7 December 2024

In this paper, an optimization-based analysis approach is presented to cost-effectively improve the energy efficiency of residential buildings in Morocco. This study introduces a unique focus on the Moroccan context, where a comprehensive application...

(This article belongs to the Collection Sustainable Buildings in the Built Environment)
  • Article
  • Open Access
22 Citations
4,177 Views
15 Pages

Adding Zero-Valent Iron to Enhance Electricity Generation during MFC Start-Up

  • Chao Li,
  • Kang Zhou,
  • Hanyue He,
  • Jiashun Cao and
  • Shihua Zhou

The low power generation efficiency of microbial fuel cells (MFCs) is always a barrier to further development. An attempt to enhance the start-up and electricity generation of MFCs was investigated by adding different doses of zero-valent iron into a...

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