Finite element（FE） is a powerful tool and has been applied by investigators to real-time hybrid simulations（RTHSs）. This study focuses on the computational efficiency, including the computational time and accuracy...Finite element（FE） is a powerful tool and has been applied by investigators to real-time hybrid simulations（RTHSs）. This study focuses on the computational efficiency, including the computational time and accuracy, of numerical integrations in solving FE numerical substructure in RTHSs. First, sparse matrix storage schemes are adopted to decrease the computational time of FE numerical substructure. In this way, the task execution time（TET） decreases such that the scale of the numerical substructure model increases. Subsequently, several commonly used explicit numerical integration algorithms, including the central difference method（CDM）, the Newmark explicit method, the Chang method and the Gui-λ method, are comprehensively compared to evaluate their computational time in solving FE numerical substructure. CDM is better than the other explicit integration algorithms when the damping matrix is diagonal, while the Gui-λ（λ = 4） method is advantageous when the damping matrix is non-diagonal. Finally, the effect of time delay on the computational accuracy of RTHSs is investigated by simulating structure-foundation systems. Simulation results show that the influences of time delay on the displacement response become obvious with the mass ratio increasing, and delay compensation methods may reduce the relative error of the displacement peak value to less than 5% even under the large time-step and large time delay.展开更多
On November 26,China Apparel Brands and Keqiao Textile Industry Chain Enterprises Exchange and Matchmaking Meeting was held at the Zhejiang Branch of the China Textile Information Center.Ruan Chunping,director of the ...On November 26,China Apparel Brands and Keqiao Textile Industry Chain Enterprises Exchange and Matchmaking Meeting was held at the Zhejiang Branch of the China Textile Information Center.Ruan Chunping,director of the Creative Industry Service Center of China Textile City,attended the event and pointed out in her speech that from fashionable women's wear to business men's wear,from down apparel to sportswear,"Keqiao Selected"has always been anchored to the needs of the industry and built an efficient platform to enable high-quality fabrics to be accurately matched with high-quality brands,and to create win-win results through in-depth cooperation.展开更多
With increasing global shortage of fresh water resources,many countries are prioritizing desalination as a means of utilizing abundantly available seawater resources.Integrated energy efficiency evaluation is a scient...With increasing global shortage of fresh water resources,many countries are prioritizing desalination as a means of utilizing abundantly available seawater resources.Integrated energy efficiency evaluation is a scientific method for the quantitative analysis of energy efficiency based on multiple indicators and is very useful for investment,construction,and scientific decision-making for desalination projects.In this paper,the energy efficiency evaluation of the micro energy network (MEN) of desalination for multi-source and multi-load is studied,and the basic idea of comprehensive energy efficiency evaluation is analyzed.The process includes the use of a MEN model to establish an integrated energy efficiency evaluation index system,taking into consideration energy,equipment,economic,environmental,and social factors.A combined evaluation method considering subjective and objective comprehensive weights for multi-source multi-load desalination MENs is proposed to evaluate the energy efficiency of desalination and from multiple perspectives.展开更多
Understanding of how combinations of agronomic options can be used to improve the grain yield and nitrogen use efficiency（NUE） of winter wheat is limited. A three-year experiment involving four integrated management...Understanding of how combinations of agronomic options can be used to improve the grain yield and nitrogen use efficiency（NUE） of winter wheat is limited. A three-year experiment involving four integrated management strategies was conducted from 2013 to 2015 in Tai＇an, Shandong Province, China, to evaluate changes in grain yield and NUE. The integrated management treatments were as follows： current practice（T1）; improvement of current practice（T2）; high-yield management（T3）, which aimed to maximize grain yield regardless of the cost of resource inputs; and integrated soil and crop system management（T4） with a higher seeding rate, delayed sowing date, and optimized nutrient management. Seeding rates increased by 75 seeds m^-2 with each treatment from T1（225 seeds m^-2） to T4（450 seeds m^-2）. The sowing dates were delayed from T1（5 th Oct.） to T2 and T3（8 th Oct.）, and to T4 treatment（12 th Oct.）. T1, T2, T3, and T4 received 315, 210, 315, and 240 kg N ha^-1, 120, 90, 210 and 120 kg P2O5 ha^-1, 30, 75, 90, and 45 kg K2O ha^-1, respectively. The ratio of basal application to topdressing for T1, T2, T3, and T4 was 6：4, 5：5, 4：6, and 4：6, respectively, with the N topdressing applied at regreening for T1 and at jointing stage for T2, T3, and T4. The P fertilizers in all treatments were applied as basal fertilizer. The K fertilizer for T1 and T2 was applied as basal fertilizer while the ratio of basal application to topdressing（at jointing stage） of K fertilizer for both T3 and T4 was 6：4. T1, T2, T3, and T4 were irrigated five, four, four and three times, respectively. Treatment T3 produced the highest grain yield among all treatments over three years and the average yield was 9 277.96 kg ha^-1. Grain yield averaged across three years with the T4 treatment（8 892.93 kg ha^-1） was 95.85% of that with T3 and was 21.72 and 6.10% higher than that with T1（7 305.95 kg ha^-1） and T2（8 381.41 kg ha^-1）, respectively. Treatment T2 produced the highest NUE of all the integrated treatments. The NUE with T4 was 95.36% of that with T2 and was 51.91 and 25.62% higher than that with T1 and T3, respectively. The N uptake efficiency（UPE） averaged across three years with T4 was 50.75 and 16.62% higher than that with T1and T3, respectively. The N utilization efficiency（UTE） averaged across three years with T4 was 7.74% higher than that with T3. The increased UPE with T4 compared with T3 could be attributed mostly to the lower available N in T4, while the increased UTE with T4 was mainly due to the highest N harvest index and low grain N concentration, which consequently led to improved NUE. The net profit for T4 was the highest among four treatments and was 174.94, 22.27, and 28.10% higher than that for T1, T2, and T3, respectively. Therefore, the T4 treatment should be a recommendable management strategy to obtain high grain yield, high NUE, and high economic benefits in the target region, although further improvements of NUE are required.展开更多
Physical methods show great potential and advantages on comprehensive reutilization of waste printed circuit boards (PCBs) because of lower investment and operation cost, higher efficiency and environment friendliness...Physical methods show great potential and advantages on comprehensive reutilization of waste printed circuit boards (PCBs) because of lower investment and operation cost, higher efficiency and environment friendliness. However, metals contained in fine fraction of PCBs cannot be recovered effectively by conventional equipments such as high tension electrostatic separator or shaking table. In the paper, this conundrum was resolved successfully with the enhanced Falcon SB concentrator. The separation mechanism of Falcon SB concentrator was analyzed and main factors affecting separation efficiency such as magnitude of rotation frequency of bowl, water counter pressure and slurry concentration of feed were studied and interaction of factors above also were investigated using Design-Expert software. Experiment results show that complete liberation degree and great difference of density between metals and nonmetals are suitable to recover metals from -74 μm PCBs using enhanced Falcon SB concentrator and 80.77 % integration efficiency can be achieved when slurry concentration of feed is 40 g/L with the water counter pressure of 0.01 MPa and rotation frequency of 50 Hz.展开更多
Compared with the United States,Australia,Canada,and other countries,China's coalbed methane reservoir is featured by low formation pressure,low permeability,low gas saturation,and strong heterogeneity,which not o...Compared with the United States,Australia,Canada,and other countries,China's coalbed methane reservoir is featured by low formation pressure,low permeability,low gas saturation,and strong heterogeneity,which not only increases the difficulty of reservoir stimulation but also restricts the single well production and the recovery efficiency of coalbed methane(CBM).In view of this,the research and application of horizontal drilling and completion technology of CBM at home and abroad are reviewed to provide references and theoretical supports for the advancement of the horizontal well engineering technology of CBM in China.This paper introduces a series of horizontal drilling and completion technologies(e.g.,the well type design,well structure optimization,well trajectory control,wellbore stability,completion optimization,reservoir protection,etc.).The advanced technologies and their adaptability,including screen pipe completion and stimulation with dual-layer tubular strings,radial horizontal well screen pipe completion and magnetic steering drilling,are dialectically discussed in this paper.In addition,a novel integrated engineering mode for the efficient and green development of deep CBM and coal through the underground“well factory”is proposed.The conclusions are as follows:(1)In view of the geological conditions and surface environment of the coal seam in China,the horizontal drilling and completion technologies of high rank coalbed methane should be further refined,and an integrated development for the coal measure gas is required;(2)More efforts should be made to strengthen the innovative research on horizontal drilling&completion technology for low-medium rank coals and the broken coal,so as to identify the efficient development mode for the complex coalbed methane reservoir;(3)When encountering major technical challenges during the green and efficient development of unconventional coal mines such as deep coal mines,low grade coal mines and thin coal seams in China,it is necessary to explore the development mode via in-situ conversion process based on underground“well factory”to realize the integrated green and efficient development of deep CBM and coal;(4)The high quality transformation with low-carbon and green energy in China will not only ensure national energy security,but also achieve the goal of“carbon peaking and carbon neutrality”.展开更多
Thrombosis and infection are pivotal clinical complications associated with interventional blood-contacting devices,leading to significant morbidity and mortality.To address these issues,we present a stepwise metal-ca...Thrombosis and infection are pivotal clinical complications associated with interventional blood-contacting devices,leading to significant morbidity and mortality.To address these issues,we present a stepwise metal-catechol-(amine)(MCA)surface engineering strategy that efficiently integrates therapeutic nitric oxide(NO)gas and antibacterial peptide(ABP)onto catheters,ensuring balanced anti-thrombotic and anti-infective properties.First,copper ions were controllably incorporated with norepinephrine and hexanediamine through a one-step molecular/ion co-assembly process,creating a NO-generating and amine-rich MCA surface coating.Subsequently,azide-polyethylene glycol 4-N-hydroxysuccinimidyl and dibenzylcyclooctyne modified ABP were sequentially immobilized on the surface via amide coupling and bioorthogonal click chemistry,ensuring the dense grafting of ABP while maintaining the catalytic efficacy for NO.This efficient integration of ABP and NO-generating ability on the catheter surface provides potent antibacterial properties and ability to resist adhesion and activation of platelets,thus synergistically preventing infection and thrombosis.We anticipate that this synergistic modification strategy will offer an effective solution for advancing surface engineering and enhancing the clinical performance of biomedical devices.展开更多
基金National Natural Science Foundation of China under Grant Nos.51639006 and 51725901
文摘Finite element（FE） is a powerful tool and has been applied by investigators to real-time hybrid simulations（RTHSs）. This study focuses on the computational efficiency, including the computational time and accuracy, of numerical integrations in solving FE numerical substructure in RTHSs. First, sparse matrix storage schemes are adopted to decrease the computational time of FE numerical substructure. In this way, the task execution time（TET） decreases such that the scale of the numerical substructure model increases. Subsequently, several commonly used explicit numerical integration algorithms, including the central difference method（CDM）, the Newmark explicit method, the Chang method and the Gui-λ method, are comprehensively compared to evaluate their computational time in solving FE numerical substructure. CDM is better than the other explicit integration algorithms when the damping matrix is diagonal, while the Gui-λ（λ = 4） method is advantageous when the damping matrix is non-diagonal. Finally, the effect of time delay on the computational accuracy of RTHSs is investigated by simulating structure-foundation systems. Simulation results show that the influences of time delay on the displacement response become obvious with the mass ratio increasing, and delay compensation methods may reduce the relative error of the displacement peak value to less than 5% even under the large time-step and large time delay.
文摘On November 26,China Apparel Brands and Keqiao Textile Industry Chain Enterprises Exchange and Matchmaking Meeting was held at the Zhejiang Branch of the China Textile Information Center.Ruan Chunping,director of the Creative Industry Service Center of China Textile City,attended the event and pointed out in her speech that from fashionable women's wear to business men's wear,from down apparel to sportswear,"Keqiao Selected"has always been anchored to the needs of the industry and built an efficient platform to enable high-quality fabrics to be accurately matched with high-quality brands,and to create win-win results through in-depth cooperation.
基金supported by the State Grid Corporation of China project titled “Study on Multisource and Multi-load Coordination and Optimization Technology Considering Desalination of Sea Water”(SGTJDK00DWJS1800011)
文摘With increasing global shortage of fresh water resources,many countries are prioritizing desalination as a means of utilizing abundantly available seawater resources.Integrated energy efficiency evaluation is a scientific method for the quantitative analysis of energy efficiency based on multiple indicators and is very useful for investment,construction,and scientific decision-making for desalination projects.In this paper,the energy efficiency evaluation of the micro energy network (MEN) of desalination for multi-source and multi-load is studied,and the basic idea of comprehensive energy efficiency evaluation is analyzed.The process includes the use of a MEN model to establish an integrated energy efficiency evaluation index system,taking into consideration energy,equipment,economic,environmental,and social factors.A combined evaluation method considering subjective and objective comprehensive weights for multi-source multi-load desalination MENs is proposed to evaluate the energy efficiency of desalination and from multiple perspectives.
基金supported by the National Basic Research Program of China (2015CB150404)the Special Fund for Agro-scientific Research in the Public Interest, China (201203096)the Project of Shandong Province Higher Educational Science and Technology Program, China (J15LF07)
文摘Understanding of how combinations of agronomic options can be used to improve the grain yield and nitrogen use efficiency（NUE） of winter wheat is limited. A three-year experiment involving four integrated management strategies was conducted from 2013 to 2015 in Tai＇an, Shandong Province, China, to evaluate changes in grain yield and NUE. The integrated management treatments were as follows： current practice（T1）; improvement of current practice（T2）; high-yield management（T3）, which aimed to maximize grain yield regardless of the cost of resource inputs; and integrated soil and crop system management（T4） with a higher seeding rate, delayed sowing date, and optimized nutrient management. Seeding rates increased by 75 seeds m^-2 with each treatment from T1（225 seeds m^-2） to T4（450 seeds m^-2）. The sowing dates were delayed from T1（5 th Oct.） to T2 and T3（8 th Oct.）, and to T4 treatment（12 th Oct.）. T1, T2, T3, and T4 received 315, 210, 315, and 240 kg N ha^-1, 120, 90, 210 and 120 kg P2O5 ha^-1, 30, 75, 90, and 45 kg K2O ha^-1, respectively. The ratio of basal application to topdressing for T1, T2, T3, and T4 was 6：4, 5：5, 4：6, and 4：6, respectively, with the N topdressing applied at regreening for T1 and at jointing stage for T2, T3, and T4. The P fertilizers in all treatments were applied as basal fertilizer. The K fertilizer for T1 and T2 was applied as basal fertilizer while the ratio of basal application to topdressing（at jointing stage） of K fertilizer for both T3 and T4 was 6：4. T1, T2, T3, and T4 were irrigated five, four, four and three times, respectively. Treatment T3 produced the highest grain yield among all treatments over three years and the average yield was 9 277.96 kg ha^-1. Grain yield averaged across three years with the T4 treatment（8 892.93 kg ha^-1） was 95.85% of that with T3 and was 21.72 and 6.10% higher than that with T1（7 305.95 kg ha^-1） and T2（8 381.41 kg ha^-1）, respectively. Treatment T2 produced the highest NUE of all the integrated treatments. The NUE with T4 was 95.36% of that with T2 and was 51.91 and 25.62% higher than that with T1 and T3, respectively. The N uptake efficiency（UPE） averaged across three years with T4 was 50.75 and 16.62% higher than that with T1and T3, respectively. The N utilization efficiency（UTE） averaged across three years with T4 was 7.74% higher than that with T3. The increased UPE with T4 compared with T3 could be attributed mostly to the lower available N in T4, while the increased UTE with T4 was mainly due to the highest N harvest index and low grain N concentration, which consequently led to improved NUE. The net profit for T4 was the highest among four treatments and was 174.94, 22.27, and 28.10% higher than that for T1, T2, and T3, respectively. Therefore, the T4 treatment should be a recommendable management strategy to obtain high grain yield, high NUE, and high economic benefits in the target region, although further improvements of NUE are required.
基金Project 200360290015 supported by the Doctoral Program of Higher Education, China Ministry of Education
文摘Physical methods show great potential and advantages on comprehensive reutilization of waste printed circuit boards (PCBs) because of lower investment and operation cost, higher efficiency and environment friendliness. However, metals contained in fine fraction of PCBs cannot be recovered effectively by conventional equipments such as high tension electrostatic separator or shaking table. In the paper, this conundrum was resolved successfully with the enhanced Falcon SB concentrator. The separation mechanism of Falcon SB concentrator was analyzed and main factors affecting separation efficiency such as magnitude of rotation frequency of bowl, water counter pressure and slurry concentration of feed were studied and interaction of factors above also were investigated using Design-Expert software. Experiment results show that complete liberation degree and great difference of density between metals and nonmetals are suitable to recover metals from -74 μm PCBs using enhanced Falcon SB concentrator and 80.77 % integration efficiency can be achieved when slurry concentration of feed is 40 g/L with the water counter pressure of 0.01 MPa and rotation frequency of 50 Hz.
基金Key Project of Natural Science Foundation of China(NSFC)"Basic Research on three-dimensional design&construction of an underground well factory with complex structures"(No.:52234002),and Innovative Research Group Project of NSFC“Basic Research on Drilling and Completion of Critical Oil and Gas Wells”(No.:51821092).
文摘Compared with the United States,Australia,Canada,and other countries,China's coalbed methane reservoir is featured by low formation pressure,low permeability,low gas saturation,and strong heterogeneity,which not only increases the difficulty of reservoir stimulation but also restricts the single well production and the recovery efficiency of coalbed methane(CBM).In view of this,the research and application of horizontal drilling and completion technology of CBM at home and abroad are reviewed to provide references and theoretical supports for the advancement of the horizontal well engineering technology of CBM in China.This paper introduces a series of horizontal drilling and completion technologies(e.g.,the well type design,well structure optimization,well trajectory control,wellbore stability,completion optimization,reservoir protection,etc.).The advanced technologies and their adaptability,including screen pipe completion and stimulation with dual-layer tubular strings,radial horizontal well screen pipe completion and magnetic steering drilling,are dialectically discussed in this paper.In addition,a novel integrated engineering mode for the efficient and green development of deep CBM and coal through the underground“well factory”is proposed.The conclusions are as follows:(1)In view of the geological conditions and surface environment of the coal seam in China,the horizontal drilling and completion technologies of high rank coalbed methane should be further refined,and an integrated development for the coal measure gas is required;(2)More efforts should be made to strengthen the innovative research on horizontal drilling&completion technology for low-medium rank coals and the broken coal,so as to identify the efficient development mode for the complex coalbed methane reservoir;(3)When encountering major technical challenges during the green and efficient development of unconventional coal mines such as deep coal mines,low grade coal mines and thin coal seams in China,it is necessary to explore the development mode via in-situ conversion process based on underground“well factory”to realize the integrated green and efficient development of deep CBM and coal;(4)The high quality transformation with low-carbon and green energy in China will not only ensure national energy security,but also achieve the goal of“carbon peaking and carbon neutrality”.
基金supported by the National Natural Science Foundation of China(Project 82072072,32261160372,32171326,32371377)the Guang Dong Basic and Applied Basic Research Foundation(2022B1515130010)+1 种基金the Natural Science Foundation of Guangdong Province(2022A1515011442)Dongguan Science and Technology of Social Development Program(20231800906311,20221800906322).
文摘Thrombosis and infection are pivotal clinical complications associated with interventional blood-contacting devices,leading to significant morbidity and mortality.To address these issues,we present a stepwise metal-catechol-(amine)(MCA)surface engineering strategy that efficiently integrates therapeutic nitric oxide(NO)gas and antibacterial peptide(ABP)onto catheters,ensuring balanced anti-thrombotic and anti-infective properties.First,copper ions were controllably incorporated with norepinephrine and hexanediamine through a one-step molecular/ion co-assembly process,creating a NO-generating and amine-rich MCA surface coating.Subsequently,azide-polyethylene glycol 4-N-hydroxysuccinimidyl and dibenzylcyclooctyne modified ABP were sequentially immobilized on the surface via amide coupling and bioorthogonal click chemistry,ensuring the dense grafting of ABP while maintaining the catalytic efficacy for NO.This efficient integration of ABP and NO-generating ability on the catheter surface provides potent antibacterial properties and ability to resist adhesion and activation of platelets,thus synergistically preventing infection and thrombosis.We anticipate that this synergistic modification strategy will offer an effective solution for advancing surface engineering and enhancing the clinical performance of biomedical devices.
