Soil improvement is one of the most important issues in geotechnical engineering practice.The wide application of traditional improvement techniques(cement/chemical materials)are limited due to damage ecological en-vi...Soil improvement is one of the most important issues in geotechnical engineering practice.The wide application of traditional improvement techniques(cement/chemical materials)are limited due to damage ecological en-vironment and intensify carbon emissions.However,the use of microbially induced calcium carbonate pre-cipitation(MICP)to obtain bio-cement is a novel technique with the potential to induce soil stability,providing a low-carbon,environment-friendly,and sustainable integrated solution for some geotechnical engineering pro-blems in the environment.This paper presents a comprehensive review of the latest progress in soil improvement based on the MICP strategy.It systematically summarizes and overviews the mineralization mechanism,influ-encing factors,improved methods,engineering characteristics,and current field application status of the MICP.Additionally,it also explores the limitations and correspondingly proposes prospective applications via the MICP approach for soil improvement.This review indicates that the utilization of different environmental calcium-based wastes in MICP and combination of materials and MICP are conducive to meeting engineering and market demand.Furthermore,we recommend and encourage global collaborative study and practice with a view to commercializing MICP technique in the future.The current review purports to provide insights for engineers and interdisciplinary researchers,and guidance for future engineering applications.展开更多
Aquaporins play important regulatory roles in improving plant abiotic stress tolerance.To better understand whether the Os PIP1 genes collectively dominate the osmotic regulation in rice under salt stress,a cluster ed...Aquaporins play important regulatory roles in improving plant abiotic stress tolerance.To better understand whether the Os PIP1 genes collectively dominate the osmotic regulation in rice under salt stress,a cluster editing of the Os PIP1;1,Os PIP1;2 and Os PIP1;3 genes in rice was performed by CRISPR/Cas9 system.Sequencing showed that two mutants with Cas9-free,line 14 and line 18 were successfully edited.Briefly,line 14 deleted a single C base in both the Os PIP1;1 and Os PIP1;3 genes,and inserted a single T base in the Os PIP1;2 gene,respectively.While line 18 demonstrated an insertion of a single A base in the Os PIP1;1gene and a single T base in both the Os PIP1;2 and Os PIP1;3 genes,respectively.Multiplex editing of the Os PIP1 genes significantly inhibited photosynthetic rate and accumulation of compatible metabolites,but increased MDA contents and osmotic potentials in the mutants,thus delaying rice growth under salt stress.Functional loss of the Os PIP1 genes obviously suppressed the expressions of the Os PIP1,Os SOS1,Os CIPK24 and Os CBL4 genes,and increased the influxes of Na+and effluxes of K^(+)/H^(+)in the roots,thus accumulating more Na+in rice mutants under salt stress.This study suggests that the Os PIP1 genes are essential modulators collectively contributing to the enhancement of rice salt stress tolerance,and multiplex editing of the Os PIP1 genes provides insight into the osmotic regulation of the PIP genes.展开更多
This article proposes an optimization control model of the systemic condition of satellite prototype based on the hybrid system. A dynamic programming algorithm is also proposed because the problem is NPhard. An empir...This article proposes an optimization control model of the systemic condition of satellite prototype based on the hybrid system. A dynamic programming algorithm is also proposed because the problem is NPhard. An empirical study validates the model and the algorithm,and proves that the pointed important management resources can be recognized and allocated optimally and correctly.展开更多
The modifications of impeller may show diverse impact on centrifugal pump operating in pump and turbine modes.To clarify this problem,the hydraulic performance of a low specific speed centrifugal pump operating in bot...The modifications of impeller may show diverse impact on centrifugal pump operating in pump and turbine modes.To clarify this problem,the hydraulic performance of a low specific speed centrifugal pump operating in both modes was firstly obtained by CFD method and verified by experiment.Then,based on the single-factor design method,a series of calculations have been conducted to identify the effects of impeller geometry parameters on the hydraulic performance in different modes.The variations of head,shaft power and hydraulic efficiency curves with different impeller parameters were explored.It is found that compared with turbine,the pump shows a more obvious variation of head.The outlet angle has positive impact both on the head consumed by pump or generated by turbine.The change of turbine shaft power is apparently smaller than that of pump for different impeller geometry parameters.Only the outlet width somewhat changes the turbine shaft power.The hydraulic efficiency in both modes shows different variation under different impeller geometric parameters,while the hydraulic efficiency of both modes is reduced with the outlet angle increasing.Meanwhile,the response amount of hydraulic efficiency caused by certain change of impeller parameters was estimated by sensitivity analysis method.It is found that only the appropriate blade number and outlet width can improve the hydraulic performance both in pump and turbine modes.Eventually,the hydraulic loss,skin friction loss and theoretical analysis were performed to explore the reason of hydraulic performance variation due to different impeller parameters.The change of slip factor,impeller inlet area,impeller outlet area or hydraulic loss results in the change of hydraulic performance in both modes.The results can be useful for hydraulic performance improvement for both pump and turbine modes through impeller geometry modification.展开更多
Quality of life and functional recovery after burn injury is the final goal of burn care,especially as most of burn patients survive the injury due to advanced medical science.However,dysfunction,disfigurement,contrac...Quality of life and functional recovery after burn injury is the final goal of burn care,especially as most of burn patients survive the injury due to advanced medical science.However,dysfunction,disfigurement,contractures,psychological problems and other discomforts due to burns and the consequent scars are common,and physical therapy and occupational therapy provide alternative treatments for these problems of burn patients.This guideline,organized by the Chinese Burn Association and Chinese Association of Burn Surgeons aims to emphasize the importance of team work in burn care and provide a brief introduction of the outlines of physical and occupational therapies during burn treatment,which is suitable for the current medical circumstances of China.It can be used as the start of the tools for burn rehabilitation.展开更多
基金funded by the National Natural Science Foundation of China(No.41962016)the Natural Science Foundation of NingXia(Nos.2023AAC02023,2023A1218,and 2021AAC02006).
文摘Soil improvement is one of the most important issues in geotechnical engineering practice.The wide application of traditional improvement techniques(cement/chemical materials)are limited due to damage ecological en-vironment and intensify carbon emissions.However,the use of microbially induced calcium carbonate pre-cipitation(MICP)to obtain bio-cement is a novel technique with the potential to induce soil stability,providing a low-carbon,environment-friendly,and sustainable integrated solution for some geotechnical engineering pro-blems in the environment.This paper presents a comprehensive review of the latest progress in soil improvement based on the MICP strategy.It systematically summarizes and overviews the mineralization mechanism,influ-encing factors,improved methods,engineering characteristics,and current field application status of the MICP.Additionally,it also explores the limitations and correspondingly proposes prospective applications via the MICP approach for soil improvement.This review indicates that the utilization of different environmental calcium-based wastes in MICP and combination of materials and MICP are conducive to meeting engineering and market demand.Furthermore,we recommend and encourage global collaborative study and practice with a view to commercializing MICP technique in the future.The current review purports to provide insights for engineers and interdisciplinary researchers,and guidance for future engineering applications.
基金supported by the National Key Research and Development Program of China (2021YFF1000402-2)the Key Project of Transgenic Crops Cultivation (2016ZX08010005-9)。
文摘Aquaporins play important regulatory roles in improving plant abiotic stress tolerance.To better understand whether the Os PIP1 genes collectively dominate the osmotic regulation in rice under salt stress,a cluster editing of the Os PIP1;1,Os PIP1;2 and Os PIP1;3 genes in rice was performed by CRISPR/Cas9 system.Sequencing showed that two mutants with Cas9-free,line 14 and line 18 were successfully edited.Briefly,line 14 deleted a single C base in both the Os PIP1;1 and Os PIP1;3 genes,and inserted a single T base in the Os PIP1;2 gene,respectively.While line 18 demonstrated an insertion of a single A base in the Os PIP1;1gene and a single T base in both the Os PIP1;2 and Os PIP1;3 genes,respectively.Multiplex editing of the Os PIP1 genes significantly inhibited photosynthetic rate and accumulation of compatible metabolites,but increased MDA contents and osmotic potentials in the mutants,thus delaying rice growth under salt stress.Functional loss of the Os PIP1 genes obviously suppressed the expressions of the Os PIP1,Os SOS1,Os CIPK24 and Os CBL4 genes,and increased the influxes of Na+and effluxes of K^(+)/H^(+)in the roots,thus accumulating more Na+in rice mutants under salt stress.This study suggests that the Os PIP1 genes are essential modulators collectively contributing to the enhancement of rice salt stress tolerance,and multiplex editing of the Os PIP1 genes provides insight into the osmotic regulation of the PIP genes.
文摘This article proposes an optimization control model of the systemic condition of satellite prototype based on the hybrid system. A dynamic programming algorithm is also proposed because the problem is NPhard. An empirical study validates the model and the algorithm,and proves that the pointed important management resources can be recognized and allocated optimally and correctly.
基金supported by National Key Research and Development Program of China(Grant No.2016YFB0200901,2017YFC0804107)National Natural Science Foundation of China(No.51879122,51509111,51779106)+5 种基金Zhenjiang key research and development plan(GY2017001,GY2018025)the Open Research Subject of Key Laboratory of Fluid and Power Machinery,Ministry of Education,Xihua University(szjj2015-017,szjj2017-094,szjj2016-068)Sichuan Provincial Key Lab of Process Equipment and Control(GK201614,GK201816)Young Talent Incubation Program of Jiangsu Universitya project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)Jiangsu top six talent summit project(GDZB-017)。
文摘The modifications of impeller may show diverse impact on centrifugal pump operating in pump and turbine modes.To clarify this problem,the hydraulic performance of a low specific speed centrifugal pump operating in both modes was firstly obtained by CFD method and verified by experiment.Then,based on the single-factor design method,a series of calculations have been conducted to identify the effects of impeller geometry parameters on the hydraulic performance in different modes.The variations of head,shaft power and hydraulic efficiency curves with different impeller parameters were explored.It is found that compared with turbine,the pump shows a more obvious variation of head.The outlet angle has positive impact both on the head consumed by pump or generated by turbine.The change of turbine shaft power is apparently smaller than that of pump for different impeller geometry parameters.Only the outlet width somewhat changes the turbine shaft power.The hydraulic efficiency in both modes shows different variation under different impeller geometric parameters,while the hydraulic efficiency of both modes is reduced with the outlet angle increasing.Meanwhile,the response amount of hydraulic efficiency caused by certain change of impeller parameters was estimated by sensitivity analysis method.It is found that only the appropriate blade number and outlet width can improve the hydraulic performance both in pump and turbine modes.Eventually,the hydraulic loss,skin friction loss and theoretical analysis were performed to explore the reason of hydraulic performance variation due to different impeller parameters.The change of slip factor,impeller inlet area,impeller outlet area or hydraulic loss results in the change of hydraulic performance in both modes.The results can be useful for hydraulic performance improvement for both pump and turbine modes through impeller geometry modification.
文摘Quality of life and functional recovery after burn injury is the final goal of burn care,especially as most of burn patients survive the injury due to advanced medical science.However,dysfunction,disfigurement,contractures,psychological problems and other discomforts due to burns and the consequent scars are common,and physical therapy and occupational therapy provide alternative treatments for these problems of burn patients.This guideline,organized by the Chinese Burn Association and Chinese Association of Burn Surgeons aims to emphasize the importance of team work in burn care and provide a brief introduction of the outlines of physical and occupational therapies during burn treatment,which is suitable for the current medical circumstances of China.It can be used as the start of the tools for burn rehabilitation.
