Article
Energy & Fuels
Pablo Casado, Jose M. Blanes, Francisco Javier Aguilar Valero, Cristian Torres, Manuel Lucas Miralles, Javier Ruiz Ramirez
Summary: The photovoltaic evaporative chimney not only increases the efficiency of PV panels but also cools down water stream for dissipating heat from refrigeration cycle. The design of an I-V curve measurement system effectively prevents the activation of bypass diodes and improves power generation by around 10%.
Article
Chemistry, Multidisciplinary
Jose Ignacio Morales-Aragones, Maria del Carmen Alonso-Garcia, Sara Gallardo-Saavedra, Victor Alonso-Gomez, Jose Lorenzo Balenzategui, Alberto Redondo-Plaza, Luis Hernandez-Callejo
Summary: Researchers propose a method for online dark I-V curve measurements of modules in photovoltaic plants without disconnecting them from the string. The combination of electronic boards in the modules and a bidirectional inverter shows promising results, suggesting wide potential applications in future photovoltaic plants.
APPLIED SCIENCES-BASEL
(2021)
Article
Multidisciplinary Sciences
Dmitry S. Yakovlev, Ivan A. Nazhestkin, Nidzhat G. Ismailov, Sergei V. Egorov, Vladimir N. Antonov, Vladimir L. Gurtovoi
Summary: We investigated the operation of a new bilayer material-based superconducting quantum interference device (SQUID) for ultra-sensitive detection of magnetic momentum in the milliKelvin range. By using the proximity-coupled superconductor/normal-metal (S/N) bilayers (aluminum 25 nm/platinum 5 nm), the Al/Pt SQUIDs exhibited nonhysteretic behavior in a wide temperature range from 20 mK to 0.8 K. The Al/Pt bilayer devices showed an order of magnitude lower critical current than Al devices, resulting in improved modulation depth of the critical current by magnetic flux. Additionally, operation at lower temperatures reduced thermal noise and increased the SQUID magnetic field resolution. The optimized geometry of Al/Pt symmetric SQUIDs holds promise for the detection of single-electron spin flip.
Article
Energy & Fuels
C. D. Londono, J. B. Cano, E. Velilla
Summary: The capacitance technique is a straightforward and low-cost method to trace the I-V curve of photovoltaic modules. Two performance indexes were proposed to evaluate the curve quality, and a circuital model was used to estimate the capacitance range and reduce the likelihood of measuring incomplete curves. The capacitance sizing design for monitoring PV technologies was validated through outdoor tests.
Article
Energy & Fuels
A. Padilla, C. Londono, F. Jaramillo, I. Tovar, J. B. Cano, E. Velilla
Summary: This study translates outdoor photovoltaic performance to standard test conditions (STC) or other power rating conditions by combining different I-V curves and weather data. The generated dataset covers a wide range of outdoor performance behavior as a function of irradiance and temperature, ensuring reliability in the estimation. Filtering and extrapolation techniques are used to improve estimation accuracy, achieving relative errors of less than 8% compared to datasheet values.
Article
Engineering, Aerospace
Nan Li, Juntao Chang
Summary: The hysteresis of the separation shock caused by shock-wave/boundary-layer interaction (SWBLI) is analyzed through experimental and theoretical studies. Results indicate that in the downstream region of the SWBLI, there is a tendency to excite oscillations with higher power and longer duration. The hysteresis is caused by the nonlinear relationship between the length of the shock system and flow conditions, forming a dual solution in pressure distribution.
Article
Energy & Fuels
Yongjie Liu, Kun Ding, Jingwei Zhang, Yinghu Lin, Zenan Yang, Xiang Chen, Yuanliang Li, Xihui Chen
Summary: This paper proposes an intelligent fault diagnosis method for PV array based on variable predictive models and I-V curves. By analyzing the impact of different operating states on the I-V curve, effective feature variables are extracted from key points and normalized. The normalized feature variables are then used as inputs for a variable predictive model to identify the fault types, reducing computational cost and avoiding the problem of kernel function and hyperparameter determination.
Article
Chemistry, Multidisciplinary
Mojtaba Farrokh, Farzaneh Ghasemi, Mohammad Noori, Tianyu Wang, Vasilis Sarhosis
Summary: This study proposes a novel approach combining extreme learning machine (ELM) and least-squares support vector machine (LS-SVM) for simulating hysteresis with different features. The approach accurately identifies hysteretic systems and provides more accurate results with lower computational cost compared to previous experimental studies.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Civil
Chenwei Wu, Jianyang Xue, Dejun Song
Summary: This study investigates the influence of different reinforcement methods on the hysteretic behaviors of ancient palace-style timber buildings. The results show that wood and lead reinforcement can improve the ultimate load and energy dissipation capacity of the brackets, and the circular-sectional Mantou tenon performs better. However, reinforcement with circular lead rod decreases the bearing capacity and ductility of the brackets.
Article
Engineering, Electrical & Electronic
Kapil Bhardwaj, Ata Golparvar, Junrui Chen, Gian Luca Barbruni, Sandro Carrara
Summary: Significant advancements have been made in the study of silicon nanowires (SiNWs) over the past decade. These nanoscaled devices can exhibit a memristive type of hysteresis in the current/voltage (I/V) plane that has been utilized in biosensors for exceptional sensitivities. In this study, the memristive properties of SiNW-based biosensors were investigated in their unmodified state and after surface biofunctionalization. Experimental findings show that different SiNWs can exhibit diverse memristive switching phenomena in the I/V plane.
IEEE SENSORS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Yang Yuan, Qingguo Wang, Xiaoning Sun, Wenjie Dong, Zhaoming Qu
Summary: The study found that the GNPs-CNTs/ER composite exhibits excellent nonlinear I-V properties, and diverse electrical behaviors can be obtained by adjusting the weight ratios of graphene oxide and multiwalled carbon nanotubes as well as filler concentrations. Samples with proper weight ratios and filler concentrations show stable reversibility, making them a practical material for protecting electronic equipment from overvoltage damages. Mechanisms of the regulatable I-V behavior of GNPs-CNTs/ER composite were also discussed in the research.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Thermodynamics
M. Buran, P. Kovac, L. Kopera, T. Melisek
Summary: The I-V characteristics of MgB2 superconductors with different metallic sheaths were measured, revealing that tape with Ni sheath has a higher quench power density. Enhancements in quench properties and transport ability were observed by adding high conductive strip of metal stabilization. The impact of metallic sheaths and additional stabilization on the thermal stability of MgB2 conductors carrying DC currents was discussed.
Article
Construction & Building Technology
Zhiyang Xie, Amit Kanvinde, Yiyi Chen
Summary: A unified constitutive model for structural steels is proposed to reproduce commonly observed hysteretic behaviors that are not effectively represented by current models. The model utilizes a concise description of the Bauschinger effect and a virtual boundary surface to formulate a mathematically improved evolution rule for hardening behavior, considering three cyclic mechanisms and two new plastic internal variables. Simulation results show remarkable agreement with testing data of different steel grades, particularly in the case of irregular loading histories.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2021)
Article
Thermodynamics
Yongjie Liu, Kun Ding, Jingwei Zhang, Yuanliang Li, Zenan Yang, Wenming Zheng, Xiang Chen
Summary: A fault diagnosis method for photovoltaic arrays based on deep learning methods is proposed, which can automatically extract features and use a small number of labeled data for fault diagnosis.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Engineering, Electrical & Electronic
J. Osvald
Summary: This study theoretically and experimentally analyzed the non-obvious intersections of Schottky diode I-V curves measured at different temperatures caused by increasing the series resistance of the diode with increasing temperature. The researchers developed a numerical method to anticipate the intersection point and studied different types of diodes. The results showed a small dispersion of intersection voltages within a certain temperature range, consistent with experimental observations and suppositions in the literature.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Applied
Ik-Su Byun, Danil W. Boukhvalov, Sangik Lee, Wondong Kim, Jaeyoon Baik, Hyun-Joon Shin, Changhee Lee, Young-Woo Son, Quanxi Jia, Bae Ho Park
Summary: Room-temperature ferromagnetism was observed in nanoscale functionalized graphene using atomic force microscope lithography, demonstrating potential for high-density graphene-based spintronic devices. Magnetic force microscope measurements confirmed the presence of local ferromagnetic signals in selectively functionalized graphene, indicating its suitability as a spin injector or detector in such devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
N. Haberkorn, Y. Y. Zhang, Z. X. Bi, B. H. Park, L. Civale, Q. X. Jia
Summary: The presence of Co2N impurity in δ-MoN thin films significantly affects the superconducting properties, particularly altering the critical current density. This ability to modify the superconducting properties by introducing compatible impurities may have potential applications in superconducting single-photon detectors.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Multidisciplinary Sciences
Jun-Ho Lee, Dong Hoon Shin, Heejun Yang, Nae Bong Jeong, Do-Hyun Park, Kenji Watanabe, Takashi Taniguchi, Eunah Kim, Sang Wook Lee, Sung Ho Jhang, Bae Ho Park, Young Kuk, Hyun-Jong Chung
Summary: The study presents a semiconductor-less solid-state electronic device capable of industry-applicable switching of ballistic current by modulating the field emission barrier height across the graphene-hexagonal boron nitride interface. The device demonstrates adjustable intrinsic gain and unprecedented current stability, extending the potential of 2D van der Waals devices to applications in extreme environments.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Gwangtaek Oh, Ji Hoon Jeon, Young Chul Kim, Yeong Hwan Ahn, Bae Ho Park
Summary: The study introduces a graphene/MoSe2 barristor with a high on/off ratio and external quantum efficiency. By applying an electric field to the gate electrode, the photocurrent of the barristor can be modulated, resulting in a high gate tuning ratio.
NPG ASIA MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
V. S. Yalishev, M. Iqbal, V. V. Kim, S. A. Khan, R. A. Ganeev, A. S. Alnaser
Summary: The study revealed that an increase in carbon-containing components on the metal surface was observed after storing with vacuum pump that uses mineral oils and additives, leading to the transformation from hydrophilic to hydrophobic state. Storing the laser-treated samples with oil-free pumps did not result in any change in wettability properties. The reverse transition from hydrophobic to hydrophilic state can only be achieved through annealing in an oxygen-containing environment.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Physics, Applied
Hye Ri Jung, Maryam Bari, Yunae Cho, Yeon Soo Kim, Trang Thi Thu Nguyen, Yejin Kim, Seokhyun Yoon, Young Chan Jo, Jae Hoon Kim, Shavkat Yuldashev, Zuo-Guang Ye, William Jo
Summary: This study investigates the excitonic behaviors of CH3NH3PbCl3 perovskite single crystal, revealing the free and bound excitonic transitions through temperature- and power density-dependent photoluminescence and optical transmission spectra. Different structural phases of the perovskite show distinct excitonic behaviors, contributing to the understanding of optoelectronic properties and potential applications in photonic devices. Excitonic phenomena in perovskite materials offer a fundamental approach for the development of optoelectronic applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Vadim Yalishev, Mazhar Iqbal, Vyacheslav Kim, Ali S. Alnaser
Summary: This study investigates the wettability properties of two types of titanium surfaces structured by femtosecond laser. It is found that samples textured in air show superhydrophilic properties, while samples processed in vacuum exhibit an increase in water contact angle. The observed difference can be attributed to the partial oxidation of the titanium surface during laser structuring in air. High temperature annealing of vacuum-processed samples results in complete oxidation of the titanium surface, leading to the formation of a permanent hydrophilic surface.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
V. V. Kim, V. S. Yalishev, S. A. Khan, M. Iqbal, G. S. Boltaev, R. A. Ganeev, A. S. Alnaser
Summary: In this study, the role of surrounding gas and aging in ambient air on the wettability behavior of laser-processed stainless steel meshes was analyzed. It was found that low-pressure and vacuum aging could transform the initial superhydrophilic characteristics of the laser-structured meshes to an almost superhydrophobic state.
Article
Chemistry, Multidisciplinary
Sohwi Kim, Chansoo Yoon, Gwangtaek Oh, Young Woong Lee, Minjeong Shin, Eun Hee Kee, Bae Ho Park, Ji Hye Lee, Sanghyun Park, Bo Soo Kang, Young Heon Kim
Summary: In this study, an energy-efficient synaptic device is developed for large-scale neuromorphic arrays, which mimics the cognitive system of the human brain. The device operates with low energy consumption and short operation time, comparable to synaptic events in the human brain. By adjusting the Schottky barrier and domain switching in the ferroelectric film, the weight update is achieved with low nonlinearity, asymmetry, and excellent stability.
Article
Chemistry, Multidisciplinary
Vadim Ialyshev, Ganjaboy Boltaev, Mazhar Iqbal, Mustafa Khamis, Ali S. Alnaser
Summary: This study investigates the effect of the surrounding gas environment on femtosecond laser-induced plasma at the gas-liquid interface. The results show that the plasma generated in air and N-2 environments can cause the formation of nitrate-based species in water. The findings reveal the mechanism of interaction between laser-induced plasma and water in a gaseous medium.
Article
Chemistry, Multidisciplinary
Hwa Yong Lee, Mohd Musaib Haidari, Eun Hee Kee, Jin Sik Choi, Bae Ho Park, Eleanor E. B. Campbell, Sung Ho Jhang
Summary: Graphene oxides with different degrees of oxidation were prepared by controlling UV irradiation. The charge transport transitioned from ballistic to diffusive conduction with increasing oxygenous defect density, and the transport gap grew proportional to the square root of the defect density. The bandgap of graphene oxide was deduced to be dependent on the oxygen content. The study also revealed metal-insulator transitions and 2D variable range hopping conduction in the graphene oxide samples.
Article
Chemistry, Multidisciplinary
Vadim Sh. Yalishev, Naveed A. Abbasi, Mazhar Iqbal, Ali S. Alnaser
Summary: The design of membrane surfaces plays a crucial role in manipulating and controlling liquid transport. Janus membranes with opposite wettability characteristics were fabricated using copper foam and copper mesh. By treating one side of the membranes with a femtosecond laser beam, they exhibited excellent water diode properties. A titanium oxide coating was also applied to enhance durability, making the system effective for at least 60 days. This research has potential applications in high-precision drop control and water harvesting in arid environments.
Article
Nanoscience & Nanotechnology
Duc Minh Tran, Jong Wan Son, Tae-Seong Ju, Chanyong Hwang, Bae Ho Park
Summary: This study demonstrates a simple, label-free biosensor based on molybdenum oxide for emulating tunable synaptic weight. By initiating a charge transfer mechanism through dopamine oxidation, the channel's conductance is altered, allowing operation in wide ranges of dopamine concentration.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
So-Yeon Yoo, Haena Yim, Ahrom Ryu, Chansoo Yoon, Bae Ho Park, Sahn Nahm, Ji-Won Choi
Summary: Solution-based processable high-k 2D ferroelectrics were synthesized by engineering the n value of NbO6 octahedral layers, which demonstrated ferroelectric characteristics in ultrathin films. The increase in NbO6 octahedral layer led to thicker nanosheets and tuned band gaps. The dielectric permittivity of the 5-layer stacked nanofilm also increased. The stable ferroelectricity of the synthesized material was investigated, and its ferroelectric properties have the potential to drive interesting innovations in next-generation electronics.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Chansoo Yoon, Gwangtaek Oh, Sohwi Kim, Jihoon Jeon, Ji Hye Lee, Young Heon Kim, Bae Ho Park
Summary: In this study, ECM devices with the same ferroelectric PbZr0.52Ti0.48O3 (PZT) electrolyte were developed for neuron and synaptic behavior. The Ag/PZT/LSMO memristor showed abrupt and volatile resistive switching, leading to neuron devices. The Ni/PZT/LSMO memristor exhibited gradual and non-volatile resistive switching, resulting in synaptic devices with desirable properties.
NPG ASIA MATERIALS
(2023)
