- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2019 8th International Conference on Renewable Energy Research and Applications (ICRERA) - Brasov, Romania (2019.11.3-2019.11.6)] 2019 8th International Conference on Renewable Energy Research and Applications (ICRERA) - Influence of an Impulse Current near a Photovoltaic Solar Module on Bypass Diode Characteristics
摘要： Recently, failures in photovoltaic systems (PVSs) caused by lightning damage have been increasing. When lightning strikes a PVS, the bypass diode (BPD), which is a protection element in the solar cell module (PV-MDL), breaks down and burns out, rendering the PVS inoperable. In this study, an impulse current test was conducted to clarify the lightning-induced BPD failure mechanism. The impulse current with a peak of 100 kA was employed to simulate a lightning strike traveling in the vicinity of a PV-MDL. The results indicated that a BPD fails because lightning (induced electromotive force) strikes in the bypass circuit of the PV-MDL as the impulse current passes in its vicinity. Furthermore, installing a metal frame in the PV-MDL was shown to reduce the negative impact of such lightning strikes.
关键词： impulse current test,bypass diode,lightning,photovoltaic module,induced lightning
更新于2025-09-19 17:13:59
-
[IEEE 2019 8th International Symposium on Next Generation Electronics (ISNE) - Zhengzhou, China (2019.10.9-2019.10.10)] 2019 8th International Symposium on Next Generation Electronics (ISNE) - Performance Evaluation of Photovoltaic System under Harsh Field Conditions
摘要： Power generation performance is very important for photovoltaic power generation equipment. When the equipment is laid on a large area, small difference in power generation performance with one panel will have a large influence on the total generated power, which may lead to economic loss and has a profound impact. In order to evaluate the performance of the photovoltaic equipment in harsh field conditions, a test system is proposed in this paper. After testing, the reliability of the test system is verified, and the influence of different type of harsh conditions on the power generation is investigated and discussed.
关键词： test system,photovoltaic equipment,power generation performance,harsh field condition
更新于2025-09-19 17:13:59
-
Investigation of Electrical Properties and Reliability of GaN-Based Micro-LEDs
摘要： In this paper, we report high-performance Micro-LEDs on sapphire substrates, with pixel size scaling to 20 μm and an ultra-high current density of 9902 A/cm2. The forward voltages (VF) of the devices ranged from 2.32 V to 2.39 V under an injection current density of 10 A/cm2. The size and structure-dependent effects were subsequently investigated to optimize the device design. The reliability of Micro-LED devices was evaluated under long-aging, high-temperature, and high-humidity conditions. It was found that Micro-LED devices can maintain comparable performance with an emission wavelength of about 445 nm and a full width at half maximum (FWHM) of 22 nm under extreme environments. Following this, specific analysis with four detailed factors of forward voltage, forward current, slope, and leakage current was carried out in order to show the influence of the different environments on different aspects of the devices.
关键词： GaN-based micro-LEDs,micro-LED display,reliability test
更新于2025-09-19 17:13:59
-
An Influence of the Module Structure on Reliability of Crystalline Silicon Solar Cells
摘要： To investigate the influence of the difference in module structures on the degradation of crystalline silicon solar cells, two different photovoltaic modules were fabricated, and a high-temperature and high-humidity test was carried out. The degradation modes of these modules were compared to each other using electrical characteristics and electroluminescence images. Degradation of outputs occurred in both modules, and different degradation modes were confirmed by electroluminescence images. The difference in degradation modes between these modular structures could be due to the difference in concentration distribution attributable to the moisture and acetic acid generated from the encapsulant inside the module.
关键词： Moisture Ingress,Metallization,Damp Heat Test,Corrosion,Aluminum,Photovoltaic Module,Silver Paste
更新于2025-09-19 17:13:59
-
Effect of bending test on the performance of CdTe solar cells on flexible ultra-thin glass produced by MOCVD
摘要： The development of lightweight and flexible solar modules is highly desirable for high specific power applications, building integrated photovoltaics, unmanned aerial vehicles and space. Flexible metallic and polyimide foils are frequently used, but in this work an alternative substrate with attractive properties, ultra-thin glass (UTG) has been employed. CdTe solar cells with average efficiency reaching 14.7% AM1.5G efficiency have been produced on UTG of 100 μm thickness. Little has been reported on the effects on PV performance when flexed, so we investigated the effects on J-V parameters when the measurements were performed in 40 mm and 32 mm bend radius, and in a planar state before and after the bend curvature was applied. The flat J-V measurements after 32 mm bending test showed some improvement in efficiency, Voc and FF, with values higher than the first measurement in a planar state. In addition, two CdTe solar cells with identical initial performance were subjected to 32 mm static bending test for 168 hours, the results showed excellent uniformity and stability and no significant variation on J-V parameters was observed. External quantum efficiency and capacitance voltage measurements were performed and showed no significant change in spectral response or carrier concentration. Residual stress analysis showed that no additional strain was induced within the film after the bending test and that the overall strain was low. This has demonstrated the feasibility of using CdTe solar cells on UTG in new applications, when a curved module is required without compromising performance.
关键词： Ultra-thin glass,Thin films,Metalorganic chemical vapor deposition,CdTe solar cells,Bending test
更新于2025-09-19 17:13:59
-
[IEEE 2018 International Computers, Signals and Systems Conference (ICOMSSC) - Dalian, China (2018.9.28-2018.9.30)] 2018 International Computers, Signals and Systems Conference (ICOMSSC) - Three-Dimensional Pulse Electric Field Test System with Optical Fiber
摘要： A three-dimensional pulse electric field system with optical fiber is developed. It is made up of electric field testing probe, optical transmission system, optical receiver and display, which can realize three-dimensional pulse electric field measurement in the whole space. This paper introduced the three-Dreceiving antenna, the three-D electric field signal synthesis and photoelectric receiver and then analyzed the design of the three-D receiving antenna and the method of three dimensional electric field synthesis. At last, the performance of the testing system is measured. Results show that the system has good test performance whose bandwidth can reach 1KHz-1GHz, dynamic range can be up to 60dB.
关键词： dynamic range,3-D electric field sensor,bandwidth test,Pulse electric field
更新于2025-09-19 17:13:59
-
Acute effects of photobiomodulation therapy applied to respiratory muscles of chronic obstructive pulmonary disease patients: a double-blind, randomized, placebo-controlled crossover trial
摘要： To investigate the effects of photobiomodulation applied to respiratory muscles on lung function, thoracoabdominal mobility, respiratory muscle strength, and functional capacity in COPD patients. This is a randomized double-blind crossover clinical trial. Twelve male COPD patients participated in the study. Participants were randomly allocated to receive two photobiomodulation sessions, 1 week apart: (1) an effective photobiomodulation session applied at the main respiratory muscles by means of a cluster with 69 light-emitting diodes (LEDs), containing 35 red (630 ± 10 nm; 10 mW; 0.2 cm2) and 34 near-infrared (830 ± 20 nm; 10 mW; 0.2 cm2) LEDs and (2) a sham photobiomodulation session, following the same procedures without emitting light. The primary outcomes were pulmonary function (spirometric indexes); thoracoabdominal mobility (cirtometry); respiratory muscle strength (maximal respiratory pressures), assessed at three moments: (1) baseline, (2) 1 h after intervention, and (3) 24 h after intervention; and the functional capacity, assessed by the 6-min walk test (6MWT) at baseline and 24 h after intervention. No significant interactions were found for spirometric variables, maximal respiratory pressures, and cirtometry. However, there was a Time × Condition interaction (F = 18.63; p = 0.001; η2 p = 0.62) in the walked distance on the 6MWT, with a significant increase after photobiomodulation intervention (p < 0.01) compared with the baseline. Photobiomodulation applied to respiratory muscles was effective in improving acute functional capacity in COPD patients. To the best of our knowledge, this is the first study assessing the effects of photobiomodulation applied to respiratory muscles in patients with COPD.
关键词： Physical therapy,Phototherapy,Respiratory function tests,Low-level light therapy,6-min walk test
更新于2025-09-19 17:13:59
-
[IEEE 2019 International Conference on Meteorology Observations (ICMO) - Chengdu, China (2019.12.28-2019.12.31)] 2019 International Conference on Meteorology Observations (ICMO) - Comparison Test Method and Analysis between Laser Snow Depth Observation Instrument and Manual Observation
摘要： From the sensor principle and design, data processing algorithm were introduced from the aspects such as a laser automatic viewer deep the snow, and in November 2018 - April 2019,The meteorological detection center of the China meteorological administration carried out a comparison test on the equipment of laser automatic snow depth in Aletai prefecture of Xinjiang in winter.This paper provides a very complete snow depth comparison test method to evaluate and analyze the observation data in terms of accuracy, data stability and data integrity. The differences in the data analyzed by the comprehensive test were mainly caused by the wind speed, the mixture of ice water and the large temperature difference between day and night. Through the consistency analysis between the data of automatic snow depth equipment and the manual standard data, the measurement accuracy reaches the requirements of the "specification for ground meteorological observation". The laser automatic snow depth equipment can continuously and accurately reflect the change of snow cover. Finally, the existing problems of the laser snow depth observation instrument are discussed and some Suggestions for improvement are put forward.
关键词： Contrast test,Experimental difference,Laser automatic snow depth observation instrument,Consistency analysis
更新于2025-09-19 17:13:59
-
Autonomous Scan Patterns for Laser Voltage Imaging
摘要： The semiconductor industry ramping up design capabilities for emerging technologies is facing new test quality and yield management challenges. To facilitate debugging of the first silicon, diagnosis of yield issues, and to enable repair processes, an accurate defect isolation is needed with support of advanced test, diagnostic, and yield analysis tools. Laser voltage imaging (LVI), laser voltage probing (LVP), and electron-beam testing are popular diagnostic techniques for scan chain failures. As scan remains instrumental in developing more advanced DFT technologies, its reliable operations are essential for test pattern bring-up, failure analysis, and yield learning. Running LVI tests at early stages of a design process involves a sophisticated infrastructure to offer a nanometer diagnostic resolution with a non-destructive failure isolation. However, as the use of external testers may not be feasible besides providing power and clock signals, the paper demonstrates how to reuse on-chip EDT compression environment to generate and apply LVI-aware scan patterns for advanced contactless test procedures. The presented approach avoids the repetitive loading of scan chains, requires no seed patterns to encode LVI tests, has virtually no area overhead, and offers a flexible selection of non-toggling scan chains in a low power test mode. Furthermore, there are no constraints or requirements imposed by designs that could limit the applicability of the scheme. The proposed solution does not compromise the test compression performance, marked by test data reduction ratios, test coverage, and test time. Hence, there are no modifications needed in existing flows and tools to implement the method besides the use of recommended polynomials.
关键词： scan cell diagnosis,logic BIST,repeated scan integrity tests,test compression,E-beam test,laser voltage imaging
更新于2025-09-16 10:30:52
-
Development and application of fluorescence sensor and test strip based on molecularly imprinted quantum dots for the selective and sensitive detection of propanil in fish and seawater samples
摘要： Molecularly imprinted quantum dots (MIP-QDs) were successfully synthesized via reversed-phase microemulsion and used as the specific recognition element and signal probe of a fluorescence sensor or test strip to achieve the highly sensitive detection of fish and seawater samples. In addition, the limits of detection (LODs) for fish and seawater were 0.42 μg/kg and 0.38 μg/L, respectively. The fluorescence test strip developed on the basis of the MIP-QDs also displayed satisfactory recoveries of 90.1%–111.1%, and the LOD for propanil in the seawater sample was 0.6 μg/L. The proposed fluorescence sensor and test strip were successfully used in propanil determination in environment and aquatic products.
关键词： Quantum dot,Molecularly imprinted,Propanil,Fluorescence,Test strip
更新于2025-09-16 10:30:52