Study on Amplified Spontaneous Emission Properties of EnBOD Material

Lei, 张镭 Zhang; Yang, 杨杨 Yang; Jie-chao, 高劼超 Gao; Liu, Xingyuan

doi:10.3788/fgxb20153606.0661

Cited by 6 publications

(3 citation statements)

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“…Definition of the sound source for the random diffusion of the sound field and the determination of the sound field of the sound pressure distribution by the spectrum [17]: A noise spectrum is the given data in Table 4. us, the sound pressure level must be converted to sound pressure to obtain the sound pressure spectrum [18].…”

Section: Modal Analysis Resultsmentioning

confidence: 99%

Analysis on Vibroacoustic Fatigue Life of Empennage in a Hypersonic Vehicle

Hongxian

Zhang

Nie

2022

Mathematical Problems in Engineering

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In this study, the fatigue life prediction in hypersonic vehicle noise environment is researched under the structural vibration caused by the engine jet noise and the aerodynamic noise. A finite element analysis model is first established, and then natural frequency and vibration mode are obtained. According to the modal analysis, the vibroacoustic coupling calculation is finished in the dynamic analysis software. Modal participation factor, modal displacement, and the power spectral density of the stress response on the coupled surface are acquired. The finite element, border component, and vibrating stress analytical techniques are also employed in this research to predict the acoustical fatigue performance of the tail fins of a specific type of spacecraft. On the basis of vibration fatigue theory, identified material S–N curve, and linear cumulative damage theory, the Dirlik model in the frequency domain method for vibration fatigue is used to predict the fatigue life of empennage. According to the characteristics of the acoustic load, effects of the load characteristics, and damping ratios on the fatigue conditions, the design of the antifatigue design is put forward.

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Section: Modal Analysis Resultsmentioning

confidence: 99%

Analysis on Vibroacoustic Fatigue Life of Empennage in a Hypersonic Vehicle

Hongxian

Zhang

Nie

2022

Mathematical Problems in Engineering

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“…If we number the indicators and the gray clusters, we will have the j (j = 1, 2, 3, 4, 5, 6, 7, 8) indicator k (k = 1, 2, 3, 4, 5) gray cluster to represent the "k" gray cluster of the "j" indicator. Next, we will set the whitening weighted function of the "k" gray cluster of the "j" indicator [15].…”

Section: The Determining Of Whitening Weighted Functionmentioning

confidence: 99%

“…If the whitening weight function does not have the first and the second turning points, then f k j (•) is a lower measure whitening weight function, recorded as f k j −, −, x k j (3), x k j (4) ; if the second and the third turning points of the whitening weight function overlap, then f k j (•) is called a moderate measure whitening weight function, recorded as f k j x k j (1), x k j (2), −, x k j (4) ; if the whitening weight function does not have the third and the fourth turning points, then f k j (•) is called an upper measure whitening weight function, recorded as f k j x k j (1), x k j (2), −, − . Here, we respectively select the lower measure whitening weight function to indicate the measure of gray clusters at a low development level; the moderate measure whitening weight functions to indicate the measures of gray clusters at a relatively high development level, medium development level and medium-to-low development levels [15]; the upper measure whitening weight function to indicate the measure of gray cluster at the high development level. The whitening weighted function of each provincial area can be determined from a holistic view based on the agricultural mechanization development levels of the 31 provincial areas in the year 2005, the year 2010 and the year 2015, which can be used to indicate the turning points at which each indicator starts to belong to the gray clusters.…”

Section: The Determining Of Whitening Weighted Functionmentioning

confidence: 99%

Comparative Static Analysis on the Agricultural Mechanization Development Levels in China’s Provincial Areas

2022

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The foundation of the national economy is agriculture, agricultural modernization is the symbol of national modernization and agricultural mechanization is an important symbol of agricultural modernization. In this paper, the authors conducted an analysis of the agricultural mechanization levels of 31 provincial areas in China. In order to assess the agricultural mechanization levels of the provincial areas in China as accurately as possible, the authors adopted indicators in the year 2005, the year 2010 and the year 2015, and used the comparative static analysis method to observe the dynamic changes in the data over the three years. Eight items, including total agricultural mechanization power/grain output (10 million watts/10 k tons), number of large and medium-sized tractors/grain output (pcs/10 k tons), tractor plowing area/grain output (k hectares/10 k tons), total input of agricultural mechanization business operation/grain output (million yuan/10 k tons), total income of agricultural mechanization business operation/grain output (million yuan/10 k tons), and fuel consumption for agricultural production/grain output (hundred tons/10 k tons), were used as assessment indicators. With the gray weighted cluster assessment instrument, 31 provincial areas of China were classified into five gray categories at high development level, relatively high development level, medium development level, medium to low development level and low development level. An objective, scientific and comprehensive assessment of the cluster results was conducted in an effort to better provide references for the authorities to draft relevant policies and measures.

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RETRACTED ARTICLE: Research on financial management of Guangdong-Hong Kong-macao greater Bay Area based on LS-SVM algorithm and multi-model fusion

Liu

Zhang

2021

Ann Oper Res

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In order to study the financial management of the Guangdong-Hong Kong-Macao Greater Bay Area, this paper builds a financial analysis model based on the LS-SVM algorithm and analyzes the implementation process of the LS-SVM algorithm and its modeling process. Moreover, this paper conducts research on CUDA-based GPU high-performance computing methods, designs and implements the LS-SVM algorithm on the CUDA-based GPU platform, and compares and analyzes the performance before and after optimization. In addition, this paper combines the improved algorithm to construct the financial analysis model and verifies the effect of the method proposed in this paper through actual data analysis. The research results prove the effectiveness of this method. The Hausman test achieves the probability of 0.1005 and 9.60182558 chi-square statistics.

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Study on Amplified Spontaneous Emission Properties of EnBOD Material

Cited by 6 publications

References 0 publications

Analysis on Vibroacoustic Fatigue Life of Empennage in a Hypersonic Vehicle

Analysis on Vibroacoustic Fatigue Life of Empennage in a Hypersonic Vehicle

Comparative Static Analysis on the Agricultural Mechanization Development Levels in China’s Provincial Areas

RETRACTED ARTICLE: Research on financial management of Guangdong-Hong Kong-macao greater Bay Area based on LS-SVM algorithm and multi-model fusion

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