Showing 201 - 220 results of 463 for search '"difference in difference"', query time: 0.11s Refine Results
  1. 201

    Temperature Field and Gradient Effect of a Steel-Concrete Composite Box Girder Bridge by Haoxu Li, Zhiguo Zhang, Nianchun Deng

    Published 2021-01-01
    “…The conclusions show that the temperature differences of different azimuth sections and the local temperature differences between the steel and concrete joint parts of the steel-concrete composite box girder bridge are not significant. …”
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  2. 202

    Spatial Analysis - Time of Stolen Crimes in District 12 of Tehran by nabi moradpoor, keramatolah zayyari

    Published 2022-06-01
    “…The spatial analysis of stealing crimes also suggests that the direction and extent of theft is different at different times of the day, weekdays, and on a monthly basis.…”
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    Article
  3. 203

    Experimental Study on Optimization of Transmission Efficiency based on the Different Type of Lubricant by Chen Zhao, Yang Jianjun, Chen Hongtao, Bai Bateer, Jiang Zheng

    Published 2018-01-01
    “…There is some difference between different gear positions in transmission efficiency,although in the improvement of efficiency the results are almost unchanged when it is replaced with different type of lubricant. …”
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    Article
  4. 204

    Social assistance and non-agriculture employment in rural China: evidence from the Rural Minimum Living Security (Rural Dibao) by Dian Chen, Xiangming Fang

    Published 2025-02-01
    “…This study uses data from the China Household Finance Survey (CHFS) and employs Propensity Score Matching with Difference-in-Differences (PSM-DID) methods to assess the effects of Rural Dibao on non-agriculture employment and to investigate the underlying mechanisms. …”
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    Article
  5. 205

    Does Chinese policy banks' overseas lending favor Belt Road Initiative countries? by Xin Chen, Heyang Fang, Yun Liu, Yifei Zhang

    Published 2022-12-01
    “…Employing a difference‐in‐differences (DID) estimation, we show that Chinese policy banks increased aggregate lending (number of loans and loan amounts) to firms from the BRI countries compared to those from the non‐BRI countries after the initiative. …”
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  6. 206

    Impact of land prices on corporate carbon emission intensity by Lin Guo, Ying Liu, Zeqing Jiang, Xiaoping Yuan, Qi Jing

    Published 2025-01-01
    “…Using a unique dataset of Chinese industrial enterprises from 2000 to 2014, we employ a two-way fixed effects econometric model, alongside instrumental variable and Difference-in-Differences (DID) techniques, to address endogeneity concerns. …”
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  7. 207

    Improved Genetic Algorithm to Solve the Scheduling Problem of College English Courses by Jing Xu

    Published 2021-01-01
    “…Firstly, a variable-length decimal coding scheme satisfying the same course that can be scheduled at different times, different classrooms, and different teaching weeks per week is proposed, which fully considers the flexibility of classrooms and time arrangements of the course and makes the scheduling problem more reasonable. …”
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  8. 208

    Does famine during the fetal period increase the degree of disability of the elderly?—An empirical study based on data from China by Zhibin Zhang, Junnan Jiang

    Published 2025-01-01
    “…Method This paper presents an empirical analysis that utilizes the survey data from the 2018 China Health and Retirement Longitudinal Study (CHARLS), employing a cohort Difference-in-Differences (DID) modeling approach. It integrates the excess mortality rate (EDR) from China’s Great Famine with the 2018 CHARLS survey data, selecting suitable control and experimental groups for a comprehensive study. …”
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    Article
  9. 209

    The Role of Peroxisome Proliferator-Activated Receptors (PPARs) in Pan-Cancer by Runzhi Huang, Jiaqi Zhang, Mingxiao Li, Penghui Yan, Huabin Yin, Suna Zhai, Xiaolong Zhu, Peng Hu, Jiaxin Zhang, Ling Huang, Man Li, Zehui Sun, Tong Meng, Daoke Yang, Zongqiang Huang

    Published 2020-01-01
    “…PPARs and their coactivators expressed differently in different types of cancers, in different immune subtypes. …”
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  10. 210

    Determination of Geographical Origin of Wuchang Rice with the Geographical Indicator by Multielement Analysis by Lili Qian, Feng Zuo, Hongyan Liu, Caidong Zhang, Xiaoxing Chi, Dongjie Zhang

    Published 2019-01-01
    “…Only the element of Cu showed significant differences among different genotypes. In the discriminant analysis, the overall correct identification rates of the rice samples obtained in 2013 and 2014 were, respectively, 96.6% and 89.6% and the overall correct identification rate for Wuchang rice reached 100%.…”
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  11. 211

    Lubrication State Recognition Based on Energy Characteristics of Friction Vibration with EEMD and SVM by Hai-jie Yu, Hai-jun Wei, Jing-ming Li, Da‐ping Zhou, Li‐dui Wei, Hong Liu

    Published 2021-01-01
    “…The experimental results show that the frequency band energy characteristics of friction vibration signals are different under different lubrication states. Based on this, a lubrication state recognition method with ensemble empirical mode decomposition (EEMD) and support vector machine (SVM) was proposed. …”
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  12. 212

    Influence of Foundation Pit Excavation and Precipitation on Settlement of Surrounding Buildings by Hongming Wei

    Published 2021-01-01
    “…The calculation results show that the displacement of the soil layer around the foundation pit is also different between different excavation methods. As the distance between the foundation pits increases, the lateral displacement of the underground continuous wall near the frame structure gradually decreases. …”
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  13. 213

    A single flow detection enabled method for DDoS attacks in IoT based on traffic feature reconstruction and mapping by Lixia XIE, Bingdi YUAN, Hongyu YANG, Ze HU, Xiang CHENG, Liang ZHANG

    Published 2024-01-01
    “…To address the slow response time of existing detection modules to Internet of things (IoT) distributed denial of service (DDoS) attacks, their low feature differentiation, and poor detection performance, a single flow detection enabled method based on traffic feature reconstruction and mapping (SFDTFRM) was proposed.Firstly, SFDTFRM employed a queue to store previously arrived flow based on the first in, first out rule.Secondly, to address the issue of similarity between normal communication traffic of IoT devices and DDoS attack traffic, a multidimensional reconstruction neural network model more lightweight compared to the baseline model and a function mapping method were proposed.The modified model loss function was utilized to reconstruct the quantitative feature matrix of the queue according to the corresponding index, and transformed into a mapping feature matrix through the function mapping method, enhancing the differences between different types of traffic, including normal communication traffic of IoT devices and DDoS attack traffic.Finally, the frequency information was extracted using a text convolutional network and information entropy calculation and the machine learning classifier was employed for DDoS attack traffic detection.The experimental results on two benchmark datasets show that SFDTFRM can effectively detect different DDoS attacks, and the average metrics value of SFDTFRM is a maximum of 12.01% higher than other existing methods.…”
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  14. 214

    Analysis of Load Optimization in Solid Rocket Motor Propellant Grain with Pressure Cure by Zhanxin Cui, Haiyang Li, Zhibin Shen, Huiru Cui

    Published 2021-01-01
    “…However, the effect of stress and strain reduction in different directions is slightly different. The different cooling and pressure relief rates have a great influence on the process quantity. …”
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  15. 215

    Critical Review on the Implementation of Transit Oriented Development in Malaysia by Comparison with Other Countries by Rahaman Lutfi A., Naharudin Nabilah, Salleh Siti Aekbal

    Published 2024-01-01
    “…The study aims to evaluate the principles of TOD and identify similarities and differences across different regions. Using a systematic literature analysis approach, the methodology involves examining manuals, journals, and government documents related to TOD policies. …”
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  16. 216

    Modeling the Spatial Correlations among Energy Consumption, Economic Growth, and the Ecological Environment by Feng Zhao, Yi Sun, Jie Zhang, Pingping Sun

    Published 2021-01-01
    “…The results show that (1) there are spatial correlations among energy consumption, economic growth, and the ecological environment in China’s provinces, and there are obviously different agglomeration areas in spatial distribution; (2) energy consumption, economic growth, and the ecological environment level show different growth trends, and the differences between different provinces in provincial units are shrinking; and (3) regarding energy consumption, the spatial impact of economic growth on the ecological environment is obvious, and there are obvious “path dependence” characteristics in the spatial distribution and positive correlations. …”
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  17. 217

    Evaluation of the Rutting Performance of the Field Specimen Using the Hamburg Wheel-Tracking Test and Dynamic Modulus Test by Xiongwei Dai, Yanshun Jia, Shaoquan Wang, Ying Gao

    Published 2020-01-01
    “…The results showed that rutting depth was different under different test conditions, and 10000 loading cycles were recommended as the maximum loading cycles. …”
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  18. 218

    Assessing the COVID-19 Lockdown Impact on Global Air Quality: A Transportation Perspective by Meina Zheng, Feng Liu, Meichang Wang

    Published 2025-01-01
    “…Using daily air pollution data between 1 January and 31 December 2020, covering 596 major cities in 77 countries, we analyzed the data with a generalized difference-in-differences approach. The results show that lockdown restrictions reduced global concentrations of NO<sub>2</sub> by 21~35%, PM<sub>10</sub> by 14~26%, PM<sub>2.5</sub> by 9~18%, CO by 6~16%, and SO<sub>2</sub> by 5~16%, while the O<sub>3</sub> concentrations increased by 15~29% under eight specific lockdown measures. …”
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  19. 219

    Evolutionary game of international trade network based on trade policy differences by Jun Zheng, Junfang Wang, Aizhong Shen

    Published 2025-01-01
    “…Abstract Trade policy differences among different countries are important factors affecting international trade cooperation. …”
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  20. 220

    Analyzing the Cooling Rate and Its Effect on Distribution of Pattern and Size of the Titanium Diboride Particles Formed by P. Senthil Kumar, Pon Selvan Chithirai, D. Antony Prabu, G. Surya Prakash, V. Murali Krishna, Jemal Yimer Mohammed

    Published 2021-01-01
    “…The size and distribution of particles differ at different place in the MMC. An FEA tool ProCAST was used to analyze the cooling rate of the melt, and SEM is used to study the microstructure of the ingot at different places. …”
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