This paper aims to analyze the evolution of wind turbines in the last decade and place it in the context of environmental changes that have occurred in recent years. The use of artificial intelligence, genetic algorit...
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Surface-initiated rolling contact fatigue (RCF) can be triggered by dents formed due to contamination particles on raceways. To mimic this failure in this study, the surface of a steel was indented and tested in an RC...
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Usually radar target recognition methods only use a single type of radar data, such as synthetic aperture radar (SAR) or high-resolution range profile (HRRP). Compared with SAR, HRRP lacks the azimuth distribution inf...
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LiNi0.6Co0.2Mn0.2O2//graphite full cell, due to its high energy density as the most promising candidate for power batteries received increased attention, but the severe capacity loss under high-temperature conditions ...
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LiNi0.6Co0.2Mn0.2O2//graphite full cell, due to its high energy density as the most promising candidate for power batteries received increased attention, but the severe capacity loss under high-temperature conditions prevents their large-scale application. Here, glutaric anhydride（GA） and succinic anhydride（SA） as electrolyte additives are investigated to overcome the high-temperature problem of LiNi0.6Co0.2Mn0.2O2//graphite cells. Due to the unique film-forming features and high-temperature stability, the cells containing 0.5% GA and 0.5% SA can retain capacity retention of 91.2% and 92.4% stored at 60°C for 15 days, corresponding to a negligible capacity loss of 4.6 and 0.8 m Ah g-1after 200 cycles, respectively. In addition, the lifespans of cells under 25°C are also significantly extended by introducing GA and SA into the electrolytes. Electrochemical and spectroscopic techniques results indicate the full cell capacity loss is predominantly caused by the unstable anode solid electrolyte interphase（SEI） layer and a stable SEI film derived from GA and SA is formed on the graphite electrode *** SEI film can effectively inhibit the consumption of electrolytes and enhance the high-temperature performance of cells. This work paves a way for moderating high energy density cells' work under high-temperature operation by developing special anodic film-forming electrolyte additives.
The instability of wellbore pressure has been puzzling the safety of petroleum industry, including personal safety and environment. In the process of drilling, it is of great significance to establish a timely and acc...
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The identification of intercepted radio fuze modulation types is a prerequisite for decision-making in interference ***,the electromagnetic environment of modern battlefields is complex,and the signal-to-noise ratio(S...
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The identification of intercepted radio fuze modulation types is a prerequisite for decision-making in interference ***,the electromagnetic environment of modern battlefields is complex,and the signal-to-noise ratio(SNR)of such environments is usually low,which makes it difficult to implement accurate recognition of radio *** solve the above problem,a radio fuze automatic modulation recognition(AMR)method for low-SNR environments is ***,an adaptive denoising algorithm based on data rearrangement and the two-dimensional(2D)fast Fourier transform(FFT)(DR2D)is used to reduce the noise of the intercepted radio fuze intermediate frequency(IF)***,the textural features of the denoised IF signal rearranged data matrix are extracted from the statistical indicator vectors of gray-level cooccurrence matrices(GLCMs),and support vector machines(SVMs)are used for *** DR2D-based adaptive denoising algorithm achieves an average correlation coefficient of more than 0.76 for ten fuze types under SNRs of-10 d B and above,which is higher than that of other typical *** trained SVM classification model achieves an average recognition accuracy of more than 96%on seven modulation types and recognition accuracies of more than 94%on each modulation type under SNRs of-12 d B and above,which represents a good AMR performance of radio fuzes under low SNRs.
The implementation of long-term shelterbelt programs in the middle reaches of the Yellow River(MRYR),China not only has improved the overall ecological environment,but also has led to the changes of land use pattern,c...
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The implementation of long-term shelterbelt programs in the middle reaches of the Yellow River(MRYR),China not only has improved the overall ecological environment,but also has led to the changes of land use pattern,causing carbon storage ***,the relationship between carbon storage and land use change in the MRYR is not concerned,which results in the uncertainty in the simulation of carbon storage in this *** use changes directly affect the carbon storage capacity of ecosystems,and as an indicator reflecting the overall state of land use,land use degree has an important relationship with carbon *** this study,land use data and the integrated valuation of ecosystem services and trade-offs(InVEST)model were used to assess the trends in land use degree and carbon storage in the MRYR during *** potential impact index and the standard deviation ellipse(SDE)algorithm were applied to quantify and analyze the characteristics of the impact of land use changes on carbon ***,land use transitions that led to carbon storage variations and their spatial variations were *** results showed that:(1)the most significant periods of carbon storage changes and land use transitions were observed during 1990-1995 and 1995-2020,with the most changed areas locating in the east of Fenhe River and in northwestern Henan Province;(2)the positive impact of land use degree on carbon storage may be related to the environmental protection measures implemented along the Yellow River,while the negative impact may be associated with the expansion of construction land in plain areas;and(3)the conversion of other land use types to grassland was the primary factor affecting carbon storage changes during *** future land use planning,attention should be given to the direction of grassland conversion,and focus on reasonably limiting the development of construction *** enhance carbon storage,it will be crucial to increase the area
1. Challenges Thermoacoustic instability in combustors arises from the interaction between sound waves and unsteady heat release, commonly found in systems like gas turbines and *** instability leads to undesirable co...
1. Challenges Thermoacoustic instability in combustors arises from the interaction between sound waves and unsteady heat release, commonly found in systems like gas turbines and *** instability leads to undesirable consequences such as structural damage and performance deterioration. The challenge lies in predicting and mitigating these instabilities due to the complex interplay of various physical phenomena like acoustic propagation, turbulent flow, and combustion chemistry, which are summarized in detail in Aimee S. Morgans and Dong Yang 's published article.
Among the various evaluation quantities of floor impact sound isolation performance measured in RC apartment houses in accordance with JIS, we investigated the correspondence between the L number, A-weighted floor imp...
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