Showing 121 - 140 results of 463 for search '"difference in difference"', query time: 0.13s Refine Results
  1. 121

    Bearing Fault Diagnosis Method based on Sensitive Component and MCPG by Mingliang Zhang, Hongkun Li, Yue Ma, Gangjin Huang, Yuchen Xu

    Published 2021-04-01
    “…Through experimental verification, it is proved that the method has good recognition effect on different types of vibration data (different speeds, different damage types, different damage degrees).…”
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  2. 122

    Armed Conflict and Child Weight in DR Congo by Kien Le

    Published 2021-01-01
    “…Exploiting the variation across districts in exposure to armed conflict and the within-district variation in the timing of whether the child was exposed to armed conflict due to birth timing within a difference-in-differences framework, we detect adverse impacts of conflict exposure to child weight. …”
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  3. 123

    Effect of video-based trauma-informed care training for nursing staff on seclusion and restraint of psychiatric inpatients: A non-randomized controlled study by Michi Miyake, Megumi Hazumi, Kentaro Usuda, Takahiro Kawashima, Maiko Fukasawa, Hisateru Tachimori, Daisuke Nishi

    Published 2025-06-01
    “…The analysis showed that the estimated difference-in-differences coefficient of average restraint time decreased significantly by -0.24 (p = 0.01) at 6 months post-intervention, although seclusion time was not significantly decreased. …”
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  4. 124

    Analysis of the Effect of Shaft Angle on Dynamic Characteristic of the Split Torque Transmission System with Herringbone gear by Cao Jianfeng, Chen Zhigang, Chen Siyu, Tang Jinyuan

    Published 2017-01-01
    “…The research shows that shaft angles have a great influence on the dynamic characteristics of the system,when the shaft angle is different,the frequency domain distribution of system dynamic response is very different,at different speeds,the shaft angle has different influence on the dynamic load coefficient and dynamic response.…”
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  5. 125

    SIMULATION OF FATIGUE CRACK INITIATION LIFE OF TC4 TITANIUM ALLOY BASED ON ITS MESOSCOPIC PROPERTIES by JIANG Ze, XU XiWu, GUO ShuXiang, WU Bin, QI Yan

    Published 2021-01-01
    “…The results show that the crack initiation forms of the model are different under different load levels. At high stress levels,the model has a large number of independent microcracks in addition to the initiation and propagation of the main cracks,with a large crack density. …”
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  6. 126

    A Critical Review of the Book Conjugation 2 with a Descriptive Analysis Approach by Zohreh Ghorbani Madavani

    Published 2021-04-01
    “…Finally, in general, this book can be called a scientific package that tries to provide inflectional content by deductive method (mentioning the rule and then providing an example witness( and the role of meaning and subtle semantic differences in different inflectional forms are insignificant.…”
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  7. 127

    Molecular Mechanics and Quantum Chemistry Based Study of Nickel-N-Allyl Urea and N-Allyl Thiourea Complexes by P. D. Sharma, Shruti Srivastava, P. P. Singh

    Published 2009-01-01
    “…Eigenvector analysis and population analysis shows that in bonding 4s, 4p, and 3dx2-y2, 3dyz orbitals of nickel are involved but the coefficient values differ in different complexes. Out of 4px, 4py, 4pz the involvement of either 4pz or 4py, is noticeable. …”
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  8. 128

    Mathematics learning for school readiness of kindergarteners in the western rural area of china – taking county s as an example by Min Li, Xiaoping Yang

    Published 2014-04-01
    “…From the research carried out, it was concluded that development in different math abilities are not coordinated, that the children’s performance in number and volume are much better than in geometry and relationship, and that there are significant differences between different kindergartens regarding location and funding – children from independent public kindergartens and private kindergartens, charging expensive tuition fees and located in county towns, are much better than others. …”
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  9. 129

    Investor Sentiment and Stock Market Reactions to COVID-19: Evidence from China by Lin Sun, Wei Shi

    Published 2022-01-01
    “…Further, we establish a difference-in-differences (DID) model to investigate the differences between Hubei and non-Hubei listed companies. …”
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  10. 130

    Research on Water Conservation Function of Forest Ecosystem in Karst Mountain Area by LI Wenfang, YU Chunya, WANG Xiaonian, LIU Yiling

    Published 2021-01-01
    “…Taking Qianxinan Prefecture as the research area,and using 2010 land use data,and annual precipitation data,this paper analyzes and studies the water conservation capacity and spatial differences of different forest ecosystems in eight counties and cities in Qianxinan Prefecture by the precipitation storage method.The results show that:①In 2010,the total amount of water conservation in the forest ecosystem of Qianxinan Prefecture was 1.89×10<sup>10</sup> m<sup>3</sup>,and the total amount of water conservation per unit area was 1.98×10<sup>5</sup> m<sup>3</sup>;②From the perspective of spatial distribution,the total water conservation of the forest ecosystem is high in the middle and low in the surrounding areas;high in the south and low in the north;and high in the west and low in the east;③The evergreen coniferous forest has the most water conservation and the highest contribution rate,and the coniferous and broad-leaved mixed forest has the least area and less water conservation;④The forest water conservation is the most in Xingyi City and Wangmo County,and the least in Zhenfeng County.…”
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  11. 131

    An adaptive video stream transmission control method for wireless heterogeneous networks based on A3C by Zhiqiang LUO, Wei WANG, Xiaorong ZHU

    Published 2020-12-01
    “…The adaptive bit rate (ABR) algorithm has become the focus research in video transmission.However,due to the characteristics of 5G wireless heterogeneous networks,such as large fluctuation of channel bandwidth and obvious differences between different networks,the adaptive video stream transmission with multi-terminal cooperation was faced with great challenges.An adaptive video stream transmission control method based on deep reinforcement learning was proposed.First of all,a video stream dynamic programming model was established to jointly optimize the transmission rate and diversion strategy.Since the solution of this optimization problem depended on accurate channel estimation,dynamically changing channel state was difficult to achieve.Therefore,the dynamic programming problem was improved to reinforcement learning task,and the A3C algorithm was used to dynamically determine the video bit rate and diversion strategy.Finally,the simulation was carried out according to the measured network data,and compared with the traditional optimization method,the method proposed better improved the user QoE.…”
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  12. 132

    EC-Structure: Establishing Consumption Structure through Mining E-Commerce Data to Discover Consumption Upgrade by Lin Guo, Dongliang Zhang

    Published 2019-01-01
    “…The authors of this paper combine the consumption structure analysis method and data processing technology using data from an e-commerce platform to extract the consumption structure of cities, compare the structural differences between different periods, and then discover consumption upgrading according to swarm intelligence. …”
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  13. 133

    The Study on the Development of International Commercial Terms Rules by Qingrui Guo

    Published 2024-12-01
    “…International commercial terms rules is a kind of transaction rules spontaneously produced in order to improve transaction efficiency and avoid transaction risks among the practice of international trade, which is used to guide international commercial trade and different among different areas. In 1936, in order to unify the order of international commercial trade transactions, the International Chamber of Commerce formulated the standard International commercial terms rules, which have been revised nine times so far, including two revisions since the 21st century, that is, Incoterms® 2010 and Incoterms® 2020. …”
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  14. 134

    Analytical Computation of Sandy Slope Stability under the Groundwater Seepage and Earthquake Conditions by Yulin Lu, Xiaoran Chen, Li Wang

    Published 2022-01-01
    “…The results indicate that the dynamic of safety factor increases linearly with an increase in the soil internal friction angle but decreases with the slope angle and groundwater level and that the effects of direction and magnitude of the seismic inertia forces on the dynamic safety factor of sandy slope are different at different times.…”
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  15. 135

    Application analysis of MBTI occupational personality types in classroom group project teaching by Zongyi Zhang

    Published 2024-01-01
    “…Therefore, this paper uses MyersBriggs Type Indicator(For short MBTl ) professional personality test to investigate the students, obtain the overall distribution of the vocational personality types of the students, and compare the achievement differences of different professional personalities. Analyze the influence of different professional personalities of team members on the achievement of project-based courses. …”
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  16. 136

    Optimization of NVH Performance of Electric Vehicle Reducers Based on Gear Transmission Error by Yu Ziqiang, Yu Hui, Yu Renping

    Published 2023-10-01
    “…Electric vehicle reducer gears have a wide range of torque speed when working, and transmission errors of gear pairs are different under different speed and torque conditions. In order to optimize the noise,vibration and harshness (NVH) performance of the reducer, the transfer error is optimized and improved for the common speed segment and common torque segment of electric vehicles. …”
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  17. 137

    Classification of Alzheimer's disease using unsupervised diffusion component analysis by Dominique Duncan, Thomas Strohmer

    Published 2016-07-01
    “…The key difference between our method and others used to classify and detect AD early in its course is our nonlinear and local network approach, which overcomes calibration differences among different scanners and centers collecting MRI data and solves the problem of individual variation in brain size and shape. …”
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  18. 138

    Labor Industry Allocation, Industrial Structure Optimization, and Economic Growth by Liyuan Shi

    Published 2021-01-01
    “…In recent years, there has been a significant wage difference between different industries in China’s labor market, and the employees have shifted from low-wage industries to high-wage industries. …”
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  19. 139

    Analysis of Oil-Gas Two-Phase Flow and Parameter Influence of Star Herringbone Gearboxes Based on the SPH Method by Wang Lin, Du Zekai, Zheng Zhizhen, Wang Yong

    Published 2023-02-01
    “…The results show that the oil flow field distribution is obviously different at different cross-section positions in the gear shaft direction, the oil flow in the middle cross-section position of the gearbox is the largest, and the local eddy current phenomenon occurs in the area between the solar wheel, planetary wheel and oil injection port. …”
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  20. 140

    al-Masa’il al-Nahwiyyah (Dirasah Taqabuliyyah Baina Madrasah al-Bashrah wa al-Kufah) by Roviin Roviin

    Published 2018-08-01
    “…After Abu al-Aswad al-Duwali, emerging famous grammars were divided into madrasa of Bashra and Kufa, each madrasa had characteristics and differences. The differences between these two madrasas is enormous and in many cases. …”
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