The statistics of the China natural gas industry prosperity Index showed that the China natural gas industry Prosperity Index was 312.46 in the 2nd quarter of 2024,up 3.2%from the 1st quarter of 2024,a stably prospero...The statistics of the China natural gas industry prosperity Index showed that the China natural gas industry Prosperity Index was 312.46 in the 2nd quarter of 2024,up 3.2%from the 1st quarter of 2024,a stably prosperous state in the short term and a very prosperous state in the medium to long term;the prosperity index of natural gas production companies was 447.03 in the 2nd quarter of 2024,up 4.3%from the 1st quarter of 2024.展开更多
The statistics of the China matural gas industry prosperity index showed that the China natural gas industry prosperity index was 302.84 in the 1st quarter of 2024,up 3.6%from the 4th quarter of 2023,a stably prospero...The statistics of the China matural gas industry prosperity index showed that the China natural gas industry prosperity index was 302.84 in the 1st quarter of 2024,up 3.6%from the 4th quarter of 2023,a stably prosperous state in the short term and a very prosperous state in the medium to long term;the prosperity index of natural gas production companies was 428.78 in the 1st quarter of 2024.展开更多
New textile materials are being developed at a rapid pace,breaking the boundaries between traditional textile technologies and offering new functional,environmental and comfort benefits.In the first quarter of 2024,th...New textile materials are being developed at a rapid pace,breaking the boundaries between traditional textile technologies and offering new functional,environmental and comfort benefits.In the first quarter of 2024,the textile industry has ushered in a wave of innovation.These new materials not only bring new development opportunities for the textile industry,but also more possibilities for our lives.This article summarizes some of the recently released new textile materials,their application prospects and impact on the industry.展开更多
On January 8th,the China Chamber of Commerce for Import and Export of Textiles released data showing that in the fourth quarter,China’s textile and clothing exports gradually stabilised.The proportion of intermediate...On January 8th,the China Chamber of Commerce for Import and Export of Textiles released data showing that in the fourth quarter,China’s textile and clothing exports gradually stabilised.The proportion of intermediate exports in textile and clothing exports continued to rise,providing a new impetus for the substantial expansion of exports to traditional markets and international supply chain cooperation.展开更多
A series of regular and irregular wave experiments are conducted to study the reflective and transmitting performances of quarter circular breakwater （QCB） in comparison with those of semi-circular breakwater （SCB...A series of regular and irregular wave experiments are conducted to study the reflective and transmitting performances of quarter circular breakwater （QCB） in comparison with those of semi-circular breakwater （SCB）. Based on regular wave tests, the reflection and transmission characteristics of QCB are analyzed and a few influencing factors are investigated. Then, the wave energy dissipation as wave passing over the breakwater is discussed based on the hydraulic coefficients of QCB and SCB. In irregular wave experiments, the reflection coefficients of QCB and their spectrums are studied. Finally, the comparisons between the experimental results and numerical simulations for QCB under regular and irregular wave conditions are presented.展开更多
Quarter circular breakwater （QCB） is a new-type breakwater developed from senti-circular breakwater （SCB）. The superstructure of QCB is composed of a quarter circular front wall, a horizontal base slab and a verti...Quarter circular breakwater （QCB） is a new-type breakwater developed from senti-circular breakwater （SCB）. The superstructure of QCB is composed of a quarter circular front wall, a horizontal base slab and a vertical rear wall. The width of QCB＇ s base slab is about half that of SCB, which makes QCB suitable to be used on relatively finn soil foundation. The numerical wave flume based on the Reynolds averaged Navier-Stokes equations for impressible viscosity fluid is adopted in this paper to simulate the hydraulic performances of QCB. Since the geometry of both breakwaters is similar and SCB has been studied in depth, the hydraulic performances of QCB are given in comparison with those of SCB.展开更多
A series of physical tests are conducted to examine the characteristics of the wave loading exerted on circular-front breakwaters by regular waves. It is found that the wave trough instead of wave crest plays a major ...A series of physical tests are conducted to examine the characteristics of the wave loading exerted on circular-front breakwaters by regular waves. It is found that the wave trough instead of wave crest plays a major role in the failure of submerged circular caissons due to seaward sliding. The difference in the behavior of seaward and shoreward horizontal wave forces is explained based on the variations of dynamic pressure with wave parameters. A wave load model is proposed based on a modified first-order solution for the dynamic pressure on submerged circular-front caissons under a wave trough. This wave loading model is very useful for engineering design. Further studies are needed to include model uncertainties in the reliability assessment of the breakwater.展开更多
This article deals with designing a broadband and high efficiency metal multi-layer dielectric grating （MMDG） used to compress and stretch an ultrashort laser pulse. The diffraction characteristics of the IVIMDG are...This article deals with designing a broadband and high efficiency metal multi-layer dielectric grating （MMDG） used to compress and stretch an ultrashort laser pulse. The diffraction characteristics of the IVIMDG are analysed by using the rigorous coupled-wave method. The multi-layer dielectric used as the reflective mirror is made up of non- quarter-wave coatings. Taking the diffraction efficiency of the -1 order as the value of merit function, the parameters such as groove depth, residual thickness, duty cycle, and reflective mirror are optimized to obtain broadband and high diffraction efficiency. The optimized MMDG shows an ultra-broadband working spectrum with the average efficiency exceeding 97% over 160 nm wavelength centred at 1053 nm and TE polarization. The optimized MMDG should be useful for chirped pulse amplification.展开更多
An air damper possesses the advantages that there are no long term changes in the damping properties, there is no dependence on working temperature and additionally, it has less manufacturing and maintenance costs. As...An air damper possesses the advantages that there are no long term changes in the damping properties, there is no dependence on working temperature and additionally, it has less manufacturing and maintenance costs. As such, an air damper has been designed and developed based on the Maxwell type model concept in the approach of Nishihara and Asami [1]. The cylinder-piston and air-tank type damper characteristics such as air damping ratio and air spring rate have been studied by changing the length and diameter of the capillary pipe between the air cylinder and the air tank, operating air pressure and the air tank volume. A SDOF quarter-car vehicle suspension system using the developed air enclosed cylinder-piston and air-tank type damper has been analyzed for its motion transmissibility characteristics. Optimal values of the air damping ratio at various values of air spring rate have been determined for minimum motion transmissibility of the sprung mass. An experimental setup has been developed for SDOF quarter-car suspension system model using the developed air enclosed cylinder-piston and air-tank type damper to determine the motion transmissibility characteristics of the sprung mass. An attendant air pressure control system has been designed to vary air damping in the developed air damper. The results of the theoretical analysis have been compared with the experimental analysis.展开更多
http://www.keaipublishing.com/gee AIMS&SCOPE Green Energy&Environment (GEE) is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment. ...http://www.keaipublishing.com/gee AIMS&SCOPE Green Energy&Environment (GEE) is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment. This journal aims at presenting the world’s leading researches, ranging from either new or signifi cantly improved protocols or methodologies to practical application of such fi elds.展开更多
http://www.keaipublishing.com/geeAIMS&SCOPE Green Energy&Environment(GEE)is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment.This...http://www.keaipublishing.com/geeAIMS&SCOPE Green Energy&Environment(GEE)is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment.This journal aims at presenting the world’s leading researches,ranging from either new or significantly improved protocols or methodologies to practical application of such fields.展开更多
CHINESE GEOGRAPHICAL SCIENCE is the sole geographical journal published in English in China.It is undertaken by the Chinese Academy of Sciences,sponsored by Changchun Institute of Geography,the Chinese Academy of Scie...CHINESE GEOGRAPHICAL SCIENCE is the sole geographical journal published in English in China.It is undertaken by the Chinese Academy of Sciences,sponsored by Changchun Institute of Geography,the Chinese Academy of Sciences,edited by the Editorial Department of the journal,published by Science Press,Beijing New York.展开更多
http://www.keaipublishing.com/gee AIMS&SCOPE Green Energy&Environment(GEE)is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment.Thi...http://www.keaipublishing.com/gee AIMS&SCOPE Green Energy&Environment(GEE)is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment.This journal aims at presenting the world’s leading researches,ranging from either new or significantly improved protocols or methodologies to practical application of such fields.GEE publishes articles that focus on,but are not limited to,the following areas:展开更多
http://www.keaipublishing.com/gee AIMS&SCOPE Green Energy&Environment(GEE)is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment.Thi...http://www.keaipublishing.com/gee AIMS&SCOPE Green Energy&Environment(GEE)is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment.This journal aims at presenting the world’s leading researches,ranging from either new or significantly improved protocols or methodologies to practical application of such fields.展开更多
http://www.keaipublishing.com/gee AIMS&SCOPE Green Energy&Environment(GEE)is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment.Thi...http://www.keaipublishing.com/gee AIMS&SCOPE Green Energy&Environment(GEE)is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment.This journal aims at presenting the world’s leading researches,ranging from either new or significantly improved protocols or methodologies to practical application of such fields.展开更多
文摘The statistics of the China natural gas industry prosperity Index showed that the China natural gas industry Prosperity Index was 312.46 in the 2nd quarter of 2024,up 3.2%from the 1st quarter of 2024,a stably prosperous state in the short term and a very prosperous state in the medium to long term;the prosperity index of natural gas production companies was 447.03 in the 2nd quarter of 2024,up 4.3%from the 1st quarter of 2024.
文摘The statistics of the China matural gas industry prosperity index showed that the China natural gas industry prosperity index was 302.84 in the 1st quarter of 2024,up 3.6%from the 4th quarter of 2023,a stably prosperous state in the short term and a very prosperous state in the medium to long term;the prosperity index of natural gas production companies was 428.78 in the 1st quarter of 2024.
文摘New textile materials are being developed at a rapid pace,breaking the boundaries between traditional textile technologies and offering new functional,environmental and comfort benefits.In the first quarter of 2024,the textile industry has ushered in a wave of innovation.These new materials not only bring new development opportunities for the textile industry,but also more possibilities for our lives.This article summarizes some of the recently released new textile materials,their application prospects and impact on the industry.
文摘On January 8th,the China Chamber of Commerce for Import and Export of Textiles released data showing that in the fourth quarter,China’s textile and clothing exports gradually stabilised.The proportion of intermediate exports in textile and clothing exports continued to rise,providing a new impetus for the substantial expansion of exports to traditional markets and international supply chain cooperation.
基金supported by the National Natural Science Foundation of China (Grant No. 50779045)the Open Foundation of State Key Laboratory of Hydraulics and Mountain River Engineering (Grant No. 0710)+2 种基金the National Science Foundation for Post-Doctoral Scientists of China (Grant No. 20080440681)the Natural Science Foundation of Tianjin, China (Grant No. 10JCYBJC03700)the Scientific and Technologic Development Foundation of the Higher Education Institutions of Tianjin,China (Grant No. 20080906)
文摘A series of regular and irregular wave experiments are conducted to study the reflective and transmitting performances of quarter circular breakwater （QCB） in comparison with those of semi-circular breakwater （SCB）. Based on regular wave tests, the reflection and transmission characteristics of QCB are analyzed and a few influencing factors are investigated. Then, the wave energy dissipation as wave passing over the breakwater is discussed based on the hydraulic coefficients of QCB and SCB. In irregular wave experiments, the reflection coefficients of QCB and their spectrums are studied. Finally, the comparisons between the experimental results and numerical simulations for QCB under regular and irregular wave conditions are presented.
基金supported by the National Natural Science Foundation of China(Grant No.50779045)
文摘Quarter circular breakwater （QCB） is a new-type breakwater developed from senti-circular breakwater （SCB）. The superstructure of QCB is composed of a quarter circular front wall, a horizontal base slab and a vertical rear wall. The width of QCB＇ s base slab is about half that of SCB, which makes QCB suitable to be used on relatively finn soil foundation. The numerical wave flume based on the Reynolds averaged Navier-Stokes equations for impressible viscosity fluid is adopted in this paper to simulate the hydraulic performances of QCB. Since the geometry of both breakwaters is similar and SCB has been studied in depth, the hydraulic performances of QCB are given in comparison with those of SCB.
基金financially supported by the Open Fund of the State Key Laboratory of Hydraulic Engineering Simulation and Safety from Tianjin University(Gtant No.HESS-1310)the Natural Science Foundation of Tianjin,China(Gtant No.14JCYBJC22100)+5 种基金the National Natural Science Foundation of China(Gtant No.51509178)supported by the State Scholarship Fund of China Scholarship Council(Gtant No.201308120008)supported by the Physical Oceanography Program of National Science Foundation(Grant No.1436642)the Maine Sea Grant and NOAA for Grant No.NA10OAR4170072part of EFRaCC project funded by the British Council under its Global Innovation Initiativethe open fund research at the State Key Laboratory of Hydraulics and Mountain River at Sichuan University(Grant No.SKHL1311)
文摘A series of physical tests are conducted to examine the characteristics of the wave loading exerted on circular-front breakwaters by regular waves. It is found that the wave trough instead of wave crest plays a major role in the failure of submerged circular caissons due to seaward sliding. The difference in the behavior of seaward and shoreward horizontal wave forces is explained based on the variations of dynamic pressure with wave parameters. A wave load model is proposed based on a modified first-order solution for the dynamic pressure on submerged circular-front caissons under a wave trough. This wave loading model is very useful for engineering design. Further studies are needed to include model uncertainties in the reliability assessment of the breakwater.
基金Project supported by the Program of Qingdao Municipal Science and Technology Bureau, China (Grant No. 12-1-4-2-(15)-jch)the National Natural Science Foundation of China (Grant Nos. 11274188 and 10904080)the Taishan Scholars Program of Shandong Province, China
文摘This article deals with designing a broadband and high efficiency metal multi-layer dielectric grating （MMDG） used to compress and stretch an ultrashort laser pulse. The diffraction characteristics of the IVIMDG are analysed by using the rigorous coupled-wave method. The multi-layer dielectric used as the reflective mirror is made up of non- quarter-wave coatings. Taking the diffraction efficiency of the -1 order as the value of merit function, the parameters such as groove depth, residual thickness, duty cycle, and reflective mirror are optimized to obtain broadband and high diffraction efficiency. The optimized MMDG shows an ultra-broadband working spectrum with the average efficiency exceeding 97% over 160 nm wavelength centred at 1053 nm and TE polarization. The optimized MMDG should be useful for chirped pulse amplification.
文摘An air damper possesses the advantages that there are no long term changes in the damping properties, there is no dependence on working temperature and additionally, it has less manufacturing and maintenance costs. As such, an air damper has been designed and developed based on the Maxwell type model concept in the approach of Nishihara and Asami [1]. The cylinder-piston and air-tank type damper characteristics such as air damping ratio and air spring rate have been studied by changing the length and diameter of the capillary pipe between the air cylinder and the air tank, operating air pressure and the air tank volume. A SDOF quarter-car vehicle suspension system using the developed air enclosed cylinder-piston and air-tank type damper has been analyzed for its motion transmissibility characteristics. Optimal values of the air damping ratio at various values of air spring rate have been determined for minimum motion transmissibility of the sprung mass. An experimental setup has been developed for SDOF quarter-car suspension system model using the developed air enclosed cylinder-piston and air-tank type damper to determine the motion transmissibility characteristics of the sprung mass. An attendant air pressure control system has been designed to vary air damping in the developed air damper. The results of the theoretical analysis have been compared with the experimental analysis.
文摘http://www.keaipublishing.com/gee AIMS&SCOPE Green Energy&Environment (GEE) is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment. This journal aims at presenting the world’s leading researches, ranging from either new or signifi cantly improved protocols or methodologies to practical application of such fi elds.
文摘http://www.keaipublishing.com/geeAIMS&SCOPE Green Energy&Environment(GEE)is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment.This journal aims at presenting the world’s leading researches,ranging from either new or significantly improved protocols or methodologies to practical application of such fields.
文摘CHINESE GEOGRAPHICAL SCIENCE is the sole geographical journal published in English in China.It is undertaken by the Chinese Academy of Sciences,sponsored by Changchun Institute of Geography,the Chinese Academy of Sciences,edited by the Editorial Department of the journal,published by Science Press,Beijing New York.
文摘http://www.keaipublishing.com/gee AIMS&SCOPE Green Energy&Environment(GEE)is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment.This journal aims at presenting the world’s leading researches,ranging from either new or significantly improved protocols or methodologies to practical application of such fields.GEE publishes articles that focus on,but are not limited to,the following areas:
文摘http://www.keaipublishing.com/gee AIMS&SCOPE Green Energy&Environment(GEE)is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment.This journal aims at presenting the world’s leading researches,ranging from either new or significantly improved protocols or methodologies to practical application of such fields.
文摘http://www.keaipublishing.com/gee AIMS&SCOPE Green Energy&Environment(GEE)is a peer-reviewed international and interdisciplinary research journal that focuses on all aspects of green energy and environment.This journal aims at presenting the world’s leading researches,ranging from either new or significantly improved protocols or methodologies to practical application of such fields.
