Xuefeng Lei, Yiwei Ou, Yuehui Wang, Junxian Ma, Qiulian Lin
The thermal degradation performance of the polylactic acid (PLA)-based polyurethane resin was investigated by thermogravimetric analysis (TGA), thermogravimetric analysis combined with Fourier transform infrared spectroscopy (TG-FTIR) and thermal cracking gas chromatography/mass spectrometry (PY-GC/MS), while the thermal decomposition mechanism and activation energy were analyzed by different degradation mechanism models. The result demonstrates that the PLA-based polyurethane resin conforms to A2 (nuclear growth) mechanism, and the activation energy of the reaction gradually decreases as the conversion rates increases. The main degradation of polyurethane resin is the decomposition of carbamate, ester group, amide and urea group by comparing the results of the data, and the products of the thermal decomposition are mainly small molecules of primary amine, carbon dioxide, enol, enolic acid and aldehydes.
{"title":"Thermal Decomposition Behavior of Polylactic\u0000Acid-Based Polyurethane Resin","authors":"Xuefeng Lei, Yiwei Ou, Yuehui Wang, Junxian Ma, Qiulian Lin","doi":"10.15244/pjoes/172833","DOIUrl":"https://doi.org/10.15244/pjoes/172833","url":null,"abstract":"The thermal degradation performance of the polylactic acid (PLA)-based polyurethane resin was investigated by thermogravimetric analysis (TGA), thermogravimetric analysis combined with Fourier transform infrared spectroscopy (TG-FTIR) and thermal cracking gas chromatography/mass spectrometry (PY-GC/MS), while the thermal decomposition mechanism and activation energy were analyzed by different degradation mechanism models. The result demonstrates that the PLA-based polyurethane resin conforms to A2 (nuclear growth) mechanism, and the activation energy of the reaction gradually decreases as the conversion rates increases. The main degradation of polyurethane resin is the decomposition of carbamate, ester group, amide and urea group by comparing the results of the data, and the products of the thermal decomposition are mainly small molecules of primary amine, carbon dioxide, enol, enolic acid and aldehydes.","PeriodicalId":20363,"journal":{"name":"Polish Journal of Environmental Studies","volume":"40 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138596403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fly ash is a fine powdery particle collected from the unit operations of coal combustion furnaces in thermal power plants. Retained fly ash at bottom of hopper has been mixed with water and dumped in lagoons in form of slurry as pond ash (PA) or lagoon ash. Ground Granulated Blast Furnace Slag (GGBS) is a by-product obtained from steel industry. In this study, three phase of concrete specimens were prepared. In first phase, the specimens were prepared using 100% cement with various water-to-cementitious ratios. In second phase, specimens were prepared with varying water-to-cementitious ratios and PA contents ranging from 0 to 20%. Finally, the third phase, specimens were prepared to determine the optimal PA content, with GGBS ranging from 0 to 25%. The mechanical and rheological properties of different proportions of PA and GGBS have been experimentally investigated at 28 days. In addition, the flow ability and packing density of different proportions of PA and GGBS various mixes were tested. The test results revealed that combination of PA and GGBS up to 27% would enhance the fresh and harden properties of cementitious material. The rheological behaviour of optimal PA and GGBS concrete were tested at 28 days using scanning electron microscope (SEM). The results confirmed that the addition of PA and GGBS resulting in a denser, less porous, and more compact CSH microstructure in concrete.
{"title":"Properties of Binary and Ternary Blended Cement\u0000containing Pond Ash and Ground Granulated\u0000Blast Furnace Slag","authors":"D. Velumani, P. Mageshkumar, K. Yuvaraj","doi":"10.15244/pjoes/170852","DOIUrl":"https://doi.org/10.15244/pjoes/170852","url":null,"abstract":"Fly ash is a fine powdery particle collected from the unit operations of coal combustion furnaces in thermal power plants. Retained fly ash at bottom of hopper has been mixed with water and dumped in lagoons in form of slurry as pond ash (PA) or lagoon ash. Ground Granulated Blast Furnace Slag (GGBS) is a by-product obtained from steel industry. In this study, three phase of concrete specimens were prepared. In first phase, the specimens were prepared using 100% cement with various water-to-cementitious ratios. In second phase, specimens were prepared with varying water-to-cementitious ratios and PA contents ranging from 0 to 20%. Finally, the third phase, specimens were prepared to determine the optimal PA content, with GGBS ranging from 0 to 25%. The mechanical and rheological properties of different proportions of PA and GGBS have been experimentally investigated at 28 days. In addition, the flow ability and packing density of different proportions of PA and GGBS various mixes were tested. The test results revealed that combination of PA and GGBS up to 27% would enhance the fresh and harden properties of cementitious material. The rheological behaviour of optimal PA and GGBS concrete were tested at 28 days using scanning electron microscope (SEM). The results confirmed that the addition of PA and GGBS resulting in a denser, less porous, and more compact CSH microstructure in concrete.","PeriodicalId":20363,"journal":{"name":"Polish Journal of Environmental Studies","volume":"13 12","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138596632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As the main direction of a new round of industrial technology reform, the intelligent manufacturing industry has become an important trend in the transformation and development of China's manufacturing industry. It provides a new way for manufacturing industry in China to get rid of the low-end position in the global value chain distribution, enhance its competitive advantage, and realize the fundamental reversal from the low-end to the high-end. The continuous realization of intelligent process is inseparable from the innovation and diffusion of intelligent technology. Based on this, the moderated mediation model was constructed to study the sustainable mechanism of technological innovation diffusion on the intelligent transformation of manufacturing enterprises, and the specific path of technological innovation diffusion influencing the intelligent transformation of manufacturing enterprises was clarified, through the rise of value chains under the effect of competitive advantage. Using 257 valid samples of survey data to test the moderating effect model with mediation. The results show that: (1) Technological innovation diffusion has a significantly positive impact on the intelligent transformation of manufacturing enterprises; (2) The climbing of value chains can partially mediate the sustainable mechanism between technological innovation diffusion and intelligent transformation; (3) Competitive advantage plays a moderating role in the process of technological innovation diffusion, influencing value-chain climbing. With the continuous improvement of enterprise competitive advantage, the impact of technological innovation diffusion on the rise of the value chain gradually decreases; (4) The intermediary role of value chain climbing
{"title":"Sustainable Influence Mechanism of Technological\u0000Innovation Diffusion on Intelligent Transformation\u0000of Manufacturing Enterprises Based\u0000on Competitive Advantage and Value Chain\u0000Can Regulate Mediation Effect Analysis","authors":"Yanna Yin, Ziwan Zhang, Kening Da, Xin Wen","doi":"10.15244/pjoes/173439","DOIUrl":"https://doi.org/10.15244/pjoes/173439","url":null,"abstract":"As the main direction of a new round of industrial technology reform, the intelligent manufacturing industry has become an important trend in the transformation and development of China's manufacturing industry. It provides a new way for manufacturing industry in China to get rid of the low-end position in the global value chain distribution, enhance its competitive advantage, and realize the fundamental reversal from the low-end to the high-end. The continuous realization of intelligent process is inseparable from the innovation and diffusion of intelligent technology. Based on this, the moderated mediation model was constructed to study the sustainable mechanism of technological innovation diffusion on the intelligent transformation of manufacturing enterprises, and the specific path of technological innovation diffusion influencing the intelligent transformation of manufacturing enterprises was clarified, through the rise of value chains under the effect of competitive advantage. Using 257 valid samples of survey data to test the moderating effect model with mediation. The results show that: (1) Technological innovation diffusion has a significantly positive impact on the intelligent transformation of manufacturing enterprises; (2) The climbing of value chains can partially mediate the sustainable mechanism between technological innovation diffusion and intelligent transformation; (3) Competitive advantage plays a moderating role in the process of technological innovation diffusion, influencing value-chain climbing. With the continuous improvement of enterprise competitive advantage, the impact of technological innovation diffusion on the rise of the value chain gradually decreases; (4) The intermediary role of value chain climbing","PeriodicalId":20363,"journal":{"name":"Polish Journal of Environmental Studies","volume":"5 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138597201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xue Ding, Xin Shao, Jinliang Wang, Shuangyun Peng, Juncheng Shi
Kunming is the capital city of Yunnan Province and a bridgehead city facing South Asia and Southeast Asia. With the rapid development of Kunming‘s economy and society, the urbanization rate continues to increase, and the quality of the ecological environment in this area is also changing rapidly. How to quickly and accurately obtain the temporal and spatial pattern evolution of Kunming‘s ecological environment quality and explore the driving factors is of great significance to the realization of ecological environmental protection and sustainable development of Kunming. In this paper, the Google Earth Engine (GEE) platform is used to use the long-term Landsat remote sensing image data to mask the water body, extract greenness, dryness, humidity and heat, and construct the remote sensing ecological index RSEI through PCA. Using spatial analysis methods such as cold and hot spot analysis and center of gravity migration to explore the evolution of the spatio-temporal pattern of ecological environment quality in Kunming from 2000 to 2019, and use single-factor analysis and interactive detection in geographic detectors to analyze its internal driving forces. The results show,
{"title":"Research on the Spatial-Temporal Pattern\u0000Evolution and Driving Force of Ecological\u0000Environment Quality in Kunming City\u0000Based on Remote Sensing Ecological\u0000Environment Index in the Past 25 Years","authors":"Xue Ding, Xin Shao, Jinliang Wang, Shuangyun Peng, Juncheng Shi","doi":"10.15244/pjoes/173102","DOIUrl":"https://doi.org/10.15244/pjoes/173102","url":null,"abstract":"Kunming is the capital city of Yunnan Province and a bridgehead city facing South Asia and Southeast Asia. With the rapid development of Kunming‘s economy and society, the urbanization rate continues to increase, and the quality of the ecological environment in this area is also changing rapidly. How to quickly and accurately obtain the temporal and spatial pattern evolution of Kunming‘s ecological environment quality and explore the driving factors is of great significance to the realization of ecological environmental protection and sustainable development of Kunming. In this paper, the Google Earth Engine (GEE) platform is used to use the long-term Landsat remote sensing image data to mask the water body, extract greenness, dryness, humidity and heat, and construct the remote sensing ecological index RSEI through PCA. Using spatial analysis methods such as cold and hot spot analysis and center of gravity migration to explore the evolution of the spatio-temporal pattern of ecological environment quality in Kunming from 2000 to 2019, and use single-factor analysis and interactive detection in geographic detectors to analyze its internal driving forces. The results show,","PeriodicalId":20363,"journal":{"name":"Polish Journal of Environmental Studies","volume":"65 40","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138594752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Yavas, Muhammad Asif Jamal, Kaleem Ul Din, Safdar Ali, Saddam Hussain, Muhammad Farooq
The global climate change scenario intensified various environmental factors, especially in arid and semi-arid regions. Drought is one of the most severe environmental stresses affecting plant productivity. Plants in the Mediterranean climate zone are exposed to heat and drought in summer, and these conditions have a significant effect on plant growth and development. However, in this case, the entry of CO 2 into mesophyll cells is prevented and therefore the rate of photosynthesis decreases which ultimately causes a reduction in plant growth. In order to acclimate to stressful environmental conditions, plants exhibit several structural modifications to cope with these harmful conditions. This review highlights some aspects of anatomical adaptive changes in plants under drought stresssuch as a reduction in leaf size and angle, stomatal position, epidermal thickness and deposition of the cuticle to prevent the loss of water from the leaf surface. Furthermore, it elaborates the role of buliform cells in leaf rolling, structural adaptation in the mesophyll cells, and the presence of trichomes. Mesophyll cells and bulliform cells provide easier rolling of leaves in case of intense drought. In arid conditions, the economical use of water by plants is possible by closing the stomata and reducing transpiration.
{"title":"Drought-Induced Changes in Leaf Morphology and Anatomy: Overview, Implications and Perspectives","authors":"I. Yavas, Muhammad Asif Jamal, Kaleem Ul Din, Safdar Ali, Saddam Hussain, Muhammad Farooq","doi":"10.15244/pjoes/174476","DOIUrl":"https://doi.org/10.15244/pjoes/174476","url":null,"abstract":"The global climate change scenario intensified various environmental factors, especially in arid and semi-arid regions. Drought is one of the most severe environmental stresses affecting plant productivity. Plants in the Mediterranean climate zone are exposed to heat and drought in summer, and these conditions have a significant effect on plant growth and development. However, in this case, the entry of CO 2 into mesophyll cells is prevented and therefore the rate of photosynthesis decreases which ultimately causes a reduction in plant growth. In order to acclimate to stressful environmental conditions, plants exhibit several structural modifications to cope with these harmful conditions. This review highlights some aspects of anatomical adaptive changes in plants under drought stresssuch as a reduction in leaf size and angle, stomatal position, epidermal thickness and deposition of the cuticle to prevent the loss of water from the leaf surface. Furthermore, it elaborates the role of buliform cells in leaf rolling, structural adaptation in the mesophyll cells, and the presence of trichomes. Mesophyll cells and bulliform cells provide easier rolling of leaves in case of intense drought. In arid conditions, the economical use of water by plants is possible by closing the stomata and reducing transpiration.","PeriodicalId":20363,"journal":{"name":"Polish Journal of Environmental Studies","volume":"21 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139186235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The significance of green roofs in stormwater management cannot be overlooked, as they have become an integral component in the creation of sustainable cities. This study not only examined the purifying effects of substrates
{"title":"Effect of Combinations of Green Roof Substrate\u0000with Vegetation Coverage on Rainwater\u0000Quality Improvement","authors":"Xue Hu, Xinyi Song, Shanshan Song, Xiaoyan Li, Cheng Li, Zhi Zhang, Guirong Li, Qiang Chen","doi":"10.15244/pjoes/173116","DOIUrl":"https://doi.org/10.15244/pjoes/173116","url":null,"abstract":"The significance of green roofs in stormwater management cannot be overlooked, as they have become an integral component in the creation of sustainable cities. This study not only examined the purifying effects of substrates","PeriodicalId":20363,"journal":{"name":"Polish Journal of Environmental Studies","volume":"84 16","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138604436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In order to improve the adsorption capacity of waste-based ceramsite, this study proposed to use acid-alkali surface modification to enhance the adsorption capacity of ceramsite for heavy metals. In acid treatment, the ceramsite surface generated a composite pore structure, thus the specific surface area of ceramsite is significantly increased through acid treatment. In alkaline treatment, hydroxyl functional groups were loaded on the surface of the ceramsite, therefore the adsorption capacity for heavy metals was significantly improved. The surface of modified ceramic particles carries a negative charge, which is beneficial for the adsorption of cations. Taking lead ions as an example, the adsorption performance of ceramic particles on heavy metals was tested, and the maximum adsorption capacity reached 33.2 mg/g. Furthermore, the modified ceramic particles exhibit good desorption and regeneration properties. The modified ceramsite offers advantages in terms of raw material sources and production costs compared to natural zeolite.
{"title":"Mild Acid-Alkali Modification of Ceramsite:\u0000a Low-Cost Adsorbent for Lead Removal","authors":"Xingbo Yuan, Ziqiu Wang, Chuan Wang","doi":"10.15244/pjoes/173168","DOIUrl":"https://doi.org/10.15244/pjoes/173168","url":null,"abstract":"In order to improve the adsorption capacity of waste-based ceramsite, this study proposed to use acid-alkali surface modification to enhance the adsorption capacity of ceramsite for heavy metals. In acid treatment, the ceramsite surface generated a composite pore structure, thus the specific surface area of ceramsite is significantly increased through acid treatment. In alkaline treatment, hydroxyl functional groups were loaded on the surface of the ceramsite, therefore the adsorption capacity for heavy metals was significantly improved. The surface of modified ceramic particles carries a negative charge, which is beneficial for the adsorption of cations. Taking lead ions as an example, the adsorption performance of ceramic particles on heavy metals was tested, and the maximum adsorption capacity reached 33.2 mg/g. Furthermore, the modified ceramic particles exhibit good desorption and regeneration properties. The modified ceramsite offers advantages in terms of raw material sources and production costs compared to natural zeolite.","PeriodicalId":20363,"journal":{"name":"Polish Journal of Environmental Studies","volume":"17 12","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138604124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Most of the foundation soil in airport engineering belongs to unsaturated soil. The subsidence law and stress change rule of unsaturated soil foundation in the filling phase of embankment were analyzed by the software of Midas/GTS. The one-dimensional consolidation theory of unsaturated soil and the Van Genuchten model of soil water characteristics were considered in the programs. The results showed the stress decreased with depth increased and they could be seen as two straight lines. The interval time in filling phase of unsaturated soil had little impact on the stress. The depth-settlement curves had big difference between the overall filling and layered filling that the settlement of layered filling was far greater than the overall filling. In the layered filling, the curves of depth-settlement were similar with different interval time that could be approximately separated into two phases and the largest settlement appeared on the surface of the ground.
{"title":"Engineering Characteristics of Unsaturated\u0000Cohesive Foundation Soil at High-Plateau Airport\u0000with Considering the Embankment\u0000Filling Interval","authors":"Jun Feng, Yanjun Liu, Xiaomei Lu, Zikang Chen, Jian Wu, Jizhe He, Zhuoya Zhao","doi":"10.15244/pjoes/173992","DOIUrl":"https://doi.org/10.15244/pjoes/173992","url":null,"abstract":"Most of the foundation soil in airport engineering belongs to unsaturated soil. The subsidence law and stress change rule of unsaturated soil foundation in the filling phase of embankment were analyzed by the software of Midas/GTS. The one-dimensional consolidation theory of unsaturated soil and the Van Genuchten model of soil water characteristics were considered in the programs. The results showed the stress decreased with depth increased and they could be seen as two straight lines. The interval time in filling phase of unsaturated soil had little impact on the stress. The depth-settlement curves had big difference between the overall filling and layered filling that the settlement of layered filling was far greater than the overall filling. In the layered filling, the curves of depth-settlement were similar with different interval time that could be approximately separated into two phases and the largest settlement appeared on the surface of the ground.","PeriodicalId":20363,"journal":{"name":"Polish Journal of Environmental Studies","volume":"68 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138604917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Along with the rapid development of digital economy and the urgency of green development, more studies focus on the relationship between digital economy and green development. However, the existing research focuses on the impact of digital economy on green total factor productivity, ignoring digital technology, which is a key technology for improving efficiency to achieve green development. Exploring the impact of digital technologies on green total factor productivity helps to understand the impact of digital economic development on green development from an internal perspective of the digital economy. This paper uses an SBM-GML index to measure regional green total factor productivity based on provincial level data and innovatively constructs digital technology indicators based on micro-level ICT patent data in China. Fixed-effects model is used to study the impact of digital technology on green total factor productivity and moderating model is used to examine the moderating effect of capital accumulation. The results indicate that: (1) At the national level, digital technology is conducive to the improvement of green total factor productivity, and the result passes the robustness test. From a dynamic long-term impact perspective, the effect of digital technology development on green total factor productivity is showing an increasing trend. (2) Digital technology’s effect on green total factor productivity is heterogenous. The results of the subregional heterogeneity analysis indicate that the effect is greater in the coastal regions and southern regions. The results of the heterogeneity analysis of the external environment indicate that the effect is greater in regions with smaller economies, regions with lower external economic dependence, and regions with lower government fiscal intervention. (3) Capital accumulation has moderating effect in the process of digital technology affecting green total factor productivity which will inhibit the improvement of digital technology development on green total factor productivity. Based on the conclusions, to better utilize the role of digital technology in promoting green development, it is necessary for the government to build a digital technology exchange platform, promote the balanced development of digital technology, and expand domestic demand to reduce the dependence on capital accumulation.
{"title":"Digital Technology and Green Total\u0000Factor Productivity","authors":"Yan Li, Rui Sun, Yitong Rao","doi":"10.15244/pjoes/172849","DOIUrl":"https://doi.org/10.15244/pjoes/172849","url":null,"abstract":"Along with the rapid development of digital economy and the urgency of green development, more studies focus on the relationship between digital economy and green development. However, the existing research focuses on the impact of digital economy on green total factor productivity, ignoring digital technology, which is a key technology for improving efficiency to achieve green development. Exploring the impact of digital technologies on green total factor productivity helps to understand the impact of digital economic development on green development from an internal perspective of the digital economy. This paper uses an SBM-GML index to measure regional green total factor productivity based on provincial level data and innovatively constructs digital technology indicators based on micro-level ICT patent data in China. Fixed-effects model is used to study the impact of digital technology on green total factor productivity and moderating model is used to examine the moderating effect of capital accumulation. The results indicate that: (1) At the national level, digital technology is conducive to the improvement of green total factor productivity, and the result passes the robustness test. From a dynamic long-term impact perspective, the effect of digital technology development on green total factor productivity is showing an increasing trend. (2) Digital technology’s effect on green total factor productivity is heterogenous. The results of the subregional heterogeneity analysis indicate that the effect is greater in the coastal regions and southern regions. The results of the heterogeneity analysis of the external environment indicate that the effect is greater in regions with smaller economies, regions with lower external economic dependence, and regions with lower government fiscal intervention. (3) Capital accumulation has moderating effect in the process of digital technology affecting green total factor productivity which will inhibit the improvement of digital technology development on green total factor productivity. Based on the conclusions, to better utilize the role of digital technology in promoting green development, it is necessary for the government to build a digital technology exchange platform, promote the balanced development of digital technology, and expand domestic demand to reduce the dependence on capital accumulation.","PeriodicalId":20363,"journal":{"name":"Polish Journal of Environmental Studies","volume":"17 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138601655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jun Feng, Zikang Chen, Jian Wu, Jizhe He, Zhuoya Zhao, Yanjun Liu, Xiaomei Lu
Triaxial tests were performed on samples of unsaturated moraine soil at a high-plateau airport of China by using the unsaturated soil triaxial apparatus. In the tests, the matric suction and net confining pressure were controlled. In the scheme of the tests, the matric suctions were controlled at 0 kPa, 50 kPa, 100 kPa and 200 kPa. The net confining pressures were controlled at 100 kPa, 200 kPa, 300 kPa and 400 kPa. The results showed that for the unsaturated moraine soil, c' and φ ' increase in the matric suction and their growth rates were similar. The relationship between volumetric strain and net confining pressure showed that the specimens were in a state of dilatancy with a small net confining pressure and the amount of dilatancy rapidly decreased and developed into a shear shrinkage state with an increase in net confining pressure. The last amount of shrinkage was stable at approximately 0.6%. Also, the soil suction characteristic curve for the studied soil was obtained by the tests and the suction stress increased with the matric suction.
{"title":"Strength Characteristic of Unsaturated Moraine\u0000Soil at High-plateau Airport","authors":"Jun Feng, Zikang Chen, Jian Wu, Jizhe He, Zhuoya Zhao, Yanjun Liu, Xiaomei Lu","doi":"10.15244/pjoes/173994","DOIUrl":"https://doi.org/10.15244/pjoes/173994","url":null,"abstract":"Triaxial tests were performed on samples of unsaturated moraine soil at a high-plateau airport of China by using the unsaturated soil triaxial apparatus. In the tests, the matric suction and net confining pressure were controlled. In the scheme of the tests, the matric suctions were controlled at 0 kPa, 50 kPa, 100 kPa and 200 kPa. The net confining pressures were controlled at 100 kPa, 200 kPa, 300 kPa and 400 kPa. The results showed that for the unsaturated moraine soil, c' and φ ' increase in the matric suction and their growth rates were similar. The relationship between volumetric strain and net confining pressure showed that the specimens were in a state of dilatancy with a small net confining pressure and the amount of dilatancy rapidly decreased and developed into a shear shrinkage state with an increase in net confining pressure. The last amount of shrinkage was stable at approximately 0.6%. Also, the soil suction characteristic curve for the studied soil was obtained by the tests and the suction stress increased with the matric suction.","PeriodicalId":20363,"journal":{"name":"Polish Journal of Environmental Studies","volume":"24 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138601939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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