Objective To evaluate the safety and efficiency of hemi-semi laminectomy approach for the micro- surgical treatment of spinal schwannomas. Methods A total of 22 patients underwent hemi-semi laminectomy for the micros...Objective To evaluate the safety and efficiency of hemi-semi laminectomy approach for the micro- surgical treatment of spinal schwannomas. Methods A total of 22 patients underwent hemi-semi laminectomy for the microsurgical removal of spinal schwannomas during a period of 2009 and 2011 in Affiliated Hospital of Nantong University. We ret- rospectively analyzed the clinical outcomes of these patients. Results Of them, 5 cases were diagnosed with cervical schwannomas, 9 with thoracic schwarmomas, and 8 with lumbar schwannomas. All the tumors including two dumbbell schwannomas were totally removed without major complications. Postoperatively, all patients were followed up from 6 to 36 months. The symp- toms and signs were obviously improved, and no tumor recurrence or spinal deformity occurred. Conclusion Hemi-semi laminectomy is a safe and effective method for resection of spinal schwan- nomas展开更多
The influences of the substituent base position on the excited state intramolecular proton transfer fluorescence properties were explored in 2-(2'-hydroxyphenyl)imidazo[1,2-a]-pyridine(HPIP)and HPIP's derivati...The influences of the substituent base position on the excited state intramolecular proton transfer fluorescence properties were explored in 2-(2'-hydroxyphenyl)imidazo[1,2-a]-pyridine(HPIP)and HPIP's derivatives(5'Br-HPIP and 6'BrHPIP).And the density functional theory(DFT)and time-dependent DFT(TD-DFT)methods were used to calculate the molecule structures.The calculated results showed that the influence of 5'Br-HPIP on the fluorescence intensity is stronger than that of 6'Br-HPIP.The fluorescence emission peak of 5'Br-HPIP occurred a blue shift compared with HPIP,and 6'BrHPIP exhibited an opposite red shift.The change of the fluorescence emission peak was attributed to the decrease of the energy gap from 6'Br-HPIP to 5'Br-HPIP.Our work on the substituent position influence could be helpful to design and develop new materials.展开更多
Objective:Patients after radical gastrectomy often require medium-to long-term intravenous therapy.However,traditional central venous catheters(CVCs)have issues such as high infection risk and poor comfort.This study ...Objective:Patients after radical gastrectomy often require medium-to long-term intravenous therapy.However,traditional central venous catheters(CVCs)have issues such as high infection risk and poor comfort.This study aims to deeply explore the clinical application value of peripherally inserted central catheters(PICCs)after radical gastrectomy,providing a scientific basis for optimizing intravenous access selection.Methods:Fifty patients requiring catheterization after radical gastrectomy at the Friendship Hospital of Ili Kazak Autonomous Prefecture from December 2022 to May 2024 were selected.Catheterization site selection was based on patients’preferences,dividing them into two groups:the experimental group receiving PICCs and the control group receiving CVCs,with 25 patients in each group.Multi-dimensional comparative analysis was conducted,including catheterization operation time,catheter indwelling time,success rates of first and second catheterizations,and complication rates.Statistical methods such as t-tests and chi-square tests were used for in-depth analysis.Results:Compared to the control group,the experimental group had longer catheterization operations and catheter indwelling times,and a higher success rate of first catheterization(P<0.05).The incidence of catheterization complications in the experimental group was 12.00%,lower than the 40.00%in the control group(P<0.05).Conclusion:Although PICC catheterization after radical gastrectomy has relatively longer catheterization operation and indwelling times,it has a high success rate of first catheterization and a low complication rate,demonstrating high clinical application value and worth promoting in clinical practice.展开更多
Glial cells play an important role in signal transduction,energy metabolism,extracellular ion homeostasis and neuroprotection of the central nervous system.However,few studies have explained the potential effects of e...Glial cells play an important role in signal transduction,energy metabolism,extracellular ion homeostasis and neuroprotection of the central nervous system.However,few studies have explained the potential effects of exosomes from glial cells on central nervous system health and disease.In this study,the genes expressed in exosomes from astrocytes and microglia were identified by deep RNA sequencing.Kyoto Encyclopedia of Genes and Genomes analysis indicated that several pathways in these exosomes are responsible for promoting neurodegenerative diseases,including Alzheimer's disease,Parkinson's disease and Huntington's disease.Gene ontology analysis showed that extracellular exosome,mitochondrion and growth factor activity were enriched in exosomes from the unique astrocyte group,while extracellular exosome and mitochondrion were enriched in exosomes from the unique microglia group.Next,combined with the screening of hub genes,the protein-protein interaction network analysis showed that exosomes from astrocytes influence neurodegenerative diseases through metabolic balance and ubiquitin-dependent protein balance,whereas exosomes from microglia influence neurodegenerative diseases through immune inflammation and oxidative stress.Although there were differences in RNA expression between exosomes from astrocytes and microglia,the groups were related by the hub genes,ubiquitin B and heat shock protein family A(Hsp70) member 8.Ubiquitin B appeared to be involved in pleiotropic regulatory functions,including immune regulation,inflammation inhibition,protein catabolism,intracellular protein transport,exosomes and oxidative stress.The results revealed the clinical significance of exosomes from glia in neurodegenerative diseases.This study was approved by the Animal Ethics Committee of Nantong University,China(approval No.S20180102-152) on January 2,2018.展开更多
Alpha linolenic acid(ALA)is an essential polyunsaturated fatty acids that can improve human health.Rapeseed is the second largest oil crop in the world but the ALA content in its seed fatty acids is only about 10%.Two...Alpha linolenic acid(ALA)is an essential polyunsaturated fatty acids that can improve human health.Rapeseed is the second largest oil crop in the world but the ALA content in its seed fatty acids is only about 10%.Two rapeseed germplasms YH25005 and R8Q10 with high content(up to 21%)ALA were developed by intervarietal crossing.They were used as the maternal parent(P_(1))when crossed with a low ALA parent SW(P2)to produce the seeds of the F1 hybrid,F2,and backcrosses to P1(BCP1)and P2(BCP2).A multigeneration joint segregation analysis was conducted to determine major gene t polygene effects of the content of three major unsaturated fatty acids including oleic(OA),linoleic(LA)and ALA.The results showed that,although some genes favorable to ALA accumulation were not allelic in R8Q10 and YH25005,all the inheritances of OA,LA and ALA in YH25005×SW and R8Q10×SW followed a genetic model of‘two pairs of additive major genes t additive-dominant polygenes’.It is suggested that the contents of OA,LA and ALA are closely related and the major genes in the parent SW containing loss-of-function mutations in FAD2 and FAD3 loci had strong effect to reduce ALA and elevate OA.However,total genetic effect of the polygenes was greater than that of the two major genes,especial on ALA content.It indicated that it is necessary to employ a larger F2 population to find the plant that accumulate enough minor-effect polygenes for high ALA content.The results are useful for high ALA rapeseed breeding and future work of gene mapping.展开更多
This work presents a route for the study on the absorption performance of gas into liquid under the condition of adding particles in a stirred constant temperature reactor.Two evaluated systems,hydrogen–water and hyd...This work presents a route for the study on the absorption performance of gas into liquid under the condition of adding particles in a stirred constant temperature reactor.Two evaluated systems,hydrogen–water and hydrogen–methanol,with the addition of activated carbon particles(ACP)were carried out,respectively.The results showed that the addition of ACP into the water can enhance the mass transfer between hydrogen and water,the enhancement factor increases rapidly with the increase of the ACP content,and then tends to be unchanged.However,for the hydrogen–methanol system,ACP has little effect on the mass transfer performance.In addition,a gas–liquid mass transfer model considering the effect of solid particle enhancement was established based on the shuttle effect and two-film model.Results indicated that the predicted value agreed well with the experimental value in both hydrogen–methanol–ACP and hydrogen–water–ACP systems.展开更多
Loess has distinctive characteristics,leading to frequent landslide disasters and posing serious threats to the lives and properties of local re sidents.The involvement of water repre sents a critical factor in induci...Loess has distinctive characteristics,leading to frequent landslide disasters and posing serious threats to the lives and properties of local re sidents.The involvement of water repre sents a critical factor in inducing loess landslides.This study focuses on three neighboring cities sequentially situated on the Loess Plateau along the direction of aeolian deposition of loess,namely Lanzhou,Dingxi,and Tianshui,which are densely populated and prone to landslide disasters.The variations in hydraulic properties,including water retention capacity and permeability,are investigated through Soil Water Characteristic Curve(SWCC)test and hydraulic conductivity test.The experimental findings revealed that Tianshui loess exhibited the highest water retention capacity,followed by Dingxi loess,while Lanzhou loess demonstrated the lowest water retention capacity.Contrastingly,the results for the saturated permeability coefficient were found to be the opposite:Tianshui loess showed the lowest permeability,whereas Lanzhou loess displayed the highest permeability.These results are supported and analyzed by scanning electron microscopy(SEM)observation.In addition,the water retention capacity is mathematically expressed using the van Genuchten model and extended to predict unsaturated hydraulic properties of loess.The experimental results exhibit a strong accordance with one another and align with the regional distribution patterns of disasters.展开更多
This study introduces a coupled electromagnetic–thermal–mechanical model to reveal the mechanisms of microcracking and mineral melting of polymineralic rocks under microwave radiation.Experimental tests validate the...This study introduces a coupled electromagnetic–thermal–mechanical model to reveal the mechanisms of microcracking and mineral melting of polymineralic rocks under microwave radiation.Experimental tests validate the rationality of the proposed model.Embedding microscopic mineral sections into the granite model for simulation shows that uneven temperature gradients create distinct molten,porous,and nonmolten zones on the fracture surface.Moreover,the varying thermal expansion coefficients and Young's moduli among the minerals induce significant thermal stress at the mineral boundaries.Quartz and biotite with higher thermal expansion coefficients are subjected to compression,whereas plagioclase with smaller coefficients experiences tensile stress.In the molten zone,quartz undergoes transgranular cracking due to theα–βphase transition.The local high temperatures also induce melting phase transitions in biotite and feldspar.This numerical study provides new insights into the distribution of thermal stress and mineral phase changes in rocks under microwave irradiation.展开更多
The packaging materials with cushioning performance are used to prevent the internal contents from being damaged by the impact and vibration of external forces.The polyurethane microcellular elastomers(PUMEs)can absor...The packaging materials with cushioning performance are used to prevent the internal contents from being damaged by the impact and vibration of external forces.The polyurethane microcellular elastomers(PUMEs)can absorb energy through cell collapse and molecular chain creep.In this study,PUMEs with different densities were investigated by scanning electron microscopy,dynamic mechanical analysis and dynamic compression tests.PUMEs exhibited significant im pact resistance and the maximum peak stress attenuation ratio reached 73.33%.The protective equipment was made by PUME with the optimal density of 600 kg/m^(3),and then the acceleration sensing device installed with the same protective equipment fell from a height of 3,5 and 10 m to evaluate the energy-absorbing property and reusability of PUMEs.The results showed that PUMEs equipment reduced the peak acceleration of the device by 93.84%,with a maximum deviation of 9%between actual test and simulation,and shortened the impact time of first landing by 57.39%.In addition,the equipment PUMEs equipment could effectively reduce the stress on the protected items.展开更多
Spark is the most popular in-memory processing framework for big data analytics.Memory is the crucial resource for workloads to achieve performance acceleration on Spark.The extant memory capacity configuration approa...Spark is the most popular in-memory processing framework for big data analytics.Memory is the crucial resource for workloads to achieve performance acceleration on Spark.The extant memory capacity configuration approach in Spark is to statically configure the memory capacity for workloads based on user’s specifications.However,without the deep knowledge of the workload’s system-level characteristics,users in practice often conservatively overestimate the memory utilizations of their workloads and require resource manager to grant more memory share than that they actually need,which leads to the severe waste of memory resources.To address the above issue,SMConf,an automated memory capacity configuration solution for in-memory computing workloads in Spark is proposed.SMConf is designed based on the observation that,though there is not one-size-fit-all proper configuration,the one-size-fit-bunch configuration can be found for in-memory computing workloads.SMConf classifies typical Spark workloads into categories based on metrics across layers of Spark system stack.For each workload category,an individual memory requirement model is learned from the workload’s input data size and the strong-correlated configuration parameters.For an ad-hoc workload,SMConf matches its memory requirement signature to one of the workload categories with small-sized input data and determines its proper memory capacity configuration with the corresponding memory requirement model.Experimental results demonstrate that,compared to the conservative default configuration,SMConf can reduce the memory resource provision to Spark workloads by up to 69%with the slight performance degradation,and reduce the average turnaround time of Spark workloads by up to 55%in the multi-tenant environments.展开更多
[Objectives]This study was conducted to investigate the control of Chinese herbal medicine regulators on leaf spot nematode disease,the main pest of Chloranthus spicatus(Thunb.)Makino.[Methods]C.spicatus plants infect...[Objectives]This study was conducted to investigate the control of Chinese herbal medicine regulators on leaf spot nematode disease,the main pest of Chloranthus spicatus(Thunb.)Makino.[Methods]C.spicatus plants infected with nematodes were irrigated with a Chinese herbal medicine regulator at two different concentrations,and the control effect on leaf spot nematode disease of the plant was studied by measuring the number of nematodes,the contents of chlorophyll,malondialdehyde,soluble sugar and free proline in the leaves of the plants in the soil.[Results]Compared with the control,the two concentrations of Chinese herbal medicine regulator significantly reduced the number of nematodes in the soil,increased the contents of chlorophyll(mainly chlorophyll a),soluble sugar and free proline in the leaves of C.spicatus,and decreased the content of malondialdehyde.It indicated that the Chinese herbal medicine regulator could effectively control the spread of nematodes and had certain effect on the recovery of C.spicatus plants.[Conclusions]The use of Chinese herbal medicine regulators is helpful to curb the occurrence of leaf spot nematode disease in C.spicatus by biological prevention and control means,and provides theoretical guidance for the development of the green industry of C.spicatus.展开更多
In order to fabricate a large-aperture continuous phase plate(CPP)using atmospheric pressure plasma processing(APPP)with high efficiency and precision,the position dwell mode and velocity mode were proposed and the it...In order to fabricate a large-aperture continuous phase plate(CPP)using atmospheric pressure plasma processing(APPP)with high efficiency and precision,the position dwell mode and velocity mode were proposed and the iterative calculation method was developed for the non-constant removal rate.Two 320 mm×320 mm×2 mm CPPs were fabricated with two processing modes.The experiment results show that the velocity mode is capable of significantly reducing the processing time and shape error.The total processing time is decreased from 13.2 h to 9.3 h,and the surface shape error is decreased from 0.158λto 0.119λ(λ=632.8 nm)(root mean square).展开更多
Al-enabled system simulation and modelling has become useful tools to facilitate humans to understand systems in different do-mains,such as physics,astrophysics,chemistry,biology,economics,engineering and social scien...Al-enabled system simulation and modelling has become useful tools to facilitate humans to understand systems in different do-mains,such as physics,astrophysics,chemistry,biology,economics,engineering and social science.A complex system is featured with a large number of interacting components(agents,processes,etc.),whose aggregate activities are nonlinear and self-organized.Complex systems are hard to be simulated or mod-elled by using traditional computational approaches due to complex relationships among system components,distributed features of resources,and dynamics of environments.Meanwhile,agent and multi-agent systems have demonstrated advantages and great potentials in modelling and simulating complex systems.展开更多
Gelatin-based biomaterials have emerged as promising candidates for bioadhesives due to their biodegradability and biocompatibility.However,they often face limitations due to the uncontrollable phase transition of gel...Gelatin-based biomaterials have emerged as promising candidates for bioadhesives due to their biodegradability and biocompatibility.However,they often face limitations due to the uncontrollable phase transition of gelatin,which is dominated by hydrogen bonds between peptide chains.Here,we developed controllable phase transition gelatin-based(CPTG)bioadhesives by regulating the dynamic balance of hydrogen bonds between the peptide chains using 2-hydroxyethylurea(HU)and punicalagin(PA).These CPTG bioadhesives exhibited significant enhancements in adhesion energy and injectability even at 4℃compared to traditional gelatin bioadhesives.The developed bioadhesives could achieve self-reinforcing interfacial adhesion upon contact with moist wound tissues.This effect was attributed to HU diffusion,which disrupted the dynamic balance of hydrogen bonds and therefore induced a localized structural densification.This process was further facilitated by the presence of pyrogallol from PA.Furthermore,the CPTG bioadhesive could modulate the immune microenvironment,offering antibacterial,antioxidant,and immune-adjustable properties,thereby accelerating diabetic wound healing,as confirmed in a diabetic wound rat model.This proposed design strategy is not only crucial for developing controllable phase-transition bioadhesives for diverse applications,but also paves the way for broadening the potential applications of gelatin-based biomaterials.展开更多
文摘Objective To evaluate the safety and efficiency of hemi-semi laminectomy approach for the micro- surgical treatment of spinal schwannomas. Methods A total of 22 patients underwent hemi-semi laminectomy for the microsurgical removal of spinal schwannomas during a period of 2009 and 2011 in Affiliated Hospital of Nantong University. We ret- rospectively analyzed the clinical outcomes of these patients. Results Of them, 5 cases were diagnosed with cervical schwannomas, 9 with thoracic schwarmomas, and 8 with lumbar schwannomas. All the tumors including two dumbbell schwannomas were totally removed without major complications. Postoperatively, all patients were followed up from 6 to 36 months. The symp- toms and signs were obviously improved, and no tumor recurrence or spinal deformity occurred. Conclusion Hemi-semi laminectomy is a safe and effective method for resection of spinal schwan- nomas
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11874180 and 11704146)the Program of Science and Technology Development Plan of Jilin Province,China(Grant Nos.20190201138TC and 20190103101JH)。
文摘The influences of the substituent base position on the excited state intramolecular proton transfer fluorescence properties were explored in 2-(2'-hydroxyphenyl)imidazo[1,2-a]-pyridine(HPIP)and HPIP's derivatives(5'Br-HPIP and 6'BrHPIP).And the density functional theory(DFT)and time-dependent DFT(TD-DFT)methods were used to calculate the molecule structures.The calculated results showed that the influence of 5'Br-HPIP on the fluorescence intensity is stronger than that of 6'Br-HPIP.The fluorescence emission peak of 5'Br-HPIP occurred a blue shift compared with HPIP,and 6'BrHPIP exhibited an opposite red shift.The change of the fluorescence emission peak was attributed to the decrease of the energy gap from 6'Br-HPIP to 5'Br-HPIP.Our work on the substituent position influence could be helpful to design and develop new materials.
基金The Ili Kazakh Autonomous Prefecture Science and Technology Plan Project(Project No.:YJC2023A28)。
文摘Objective:Patients after radical gastrectomy often require medium-to long-term intravenous therapy.However,traditional central venous catheters(CVCs)have issues such as high infection risk and poor comfort.This study aims to deeply explore the clinical application value of peripherally inserted central catheters(PICCs)after radical gastrectomy,providing a scientific basis for optimizing intravenous access selection.Methods:Fifty patients requiring catheterization after radical gastrectomy at the Friendship Hospital of Ili Kazak Autonomous Prefecture from December 2022 to May 2024 were selected.Catheterization site selection was based on patients’preferences,dividing them into two groups:the experimental group receiving PICCs and the control group receiving CVCs,with 25 patients in each group.Multi-dimensional comparative analysis was conducted,including catheterization operation time,catheter indwelling time,success rates of first and second catheterizations,and complication rates.Statistical methods such as t-tests and chi-square tests were used for in-depth analysis.Results:Compared to the control group,the experimental group had longer catheterization operations and catheter indwelling times,and a higher success rate of first catheterization(P<0.05).The incidence of catheterization complications in the experimental group was 12.00%,lower than the 40.00%in the control group(P<0.05).Conclusion:Although PICC catheterization after radical gastrectomy has relatively longer catheterization operation and indwelling times,it has a high success rate of first catheterization and a low complication rate,demonstrating high clinical application value and worth promoting in clinical practice.
基金supported by the National Natural Science Foundation of China,No.81870975 (to SLZ)Innovation and Entrepreneurship Training Program for College Students in Jiangsu Province of China,No.202010304034Z (to FYZ)。
文摘Glial cells play an important role in signal transduction,energy metabolism,extracellular ion homeostasis and neuroprotection of the central nervous system.However,few studies have explained the potential effects of exosomes from glial cells on central nervous system health and disease.In this study,the genes expressed in exosomes from astrocytes and microglia were identified by deep RNA sequencing.Kyoto Encyclopedia of Genes and Genomes analysis indicated that several pathways in these exosomes are responsible for promoting neurodegenerative diseases,including Alzheimer's disease,Parkinson's disease and Huntington's disease.Gene ontology analysis showed that extracellular exosome,mitochondrion and growth factor activity were enriched in exosomes from the unique astrocyte group,while extracellular exosome and mitochondrion were enriched in exosomes from the unique microglia group.Next,combined with the screening of hub genes,the protein-protein interaction network analysis showed that exosomes from astrocytes influence neurodegenerative diseases through metabolic balance and ubiquitin-dependent protein balance,whereas exosomes from microglia influence neurodegenerative diseases through immune inflammation and oxidative stress.Although there were differences in RNA expression between exosomes from astrocytes and microglia,the groups were related by the hub genes,ubiquitin B and heat shock protein family A(Hsp70) member 8.Ubiquitin B appeared to be involved in pleiotropic regulatory functions,including immune regulation,inflammation inhibition,protein catabolism,intracellular protein transport,exosomes and oxidative stress.The results revealed the clinical significance of exosomes from glia in neurodegenerative diseases.This study was approved by the Animal Ethics Committee of Nantong University,China(approval No.S20180102-152) on January 2,2018.
基金supported by the project of Key R&D plans of Shaanxi Province(2021NY-074)Yangling Seed Industry Innovation Plan.
文摘Alpha linolenic acid(ALA)is an essential polyunsaturated fatty acids that can improve human health.Rapeseed is the second largest oil crop in the world but the ALA content in its seed fatty acids is only about 10%.Two rapeseed germplasms YH25005 and R8Q10 with high content(up to 21%)ALA were developed by intervarietal crossing.They were used as the maternal parent(P_(1))when crossed with a low ALA parent SW(P2)to produce the seeds of the F1 hybrid,F2,and backcrosses to P1(BCP1)and P2(BCP2).A multigeneration joint segregation analysis was conducted to determine major gene t polygene effects of the content of three major unsaturated fatty acids including oleic(OA),linoleic(LA)and ALA.The results showed that,although some genes favorable to ALA accumulation were not allelic in R8Q10 and YH25005,all the inheritances of OA,LA and ALA in YH25005×SW and R8Q10×SW followed a genetic model of‘two pairs of additive major genes t additive-dominant polygenes’.It is suggested that the contents of OA,LA and ALA are closely related and the major genes in the parent SW containing loss-of-function mutations in FAD2 and FAD3 loci had strong effect to reduce ALA and elevate OA.However,total genetic effect of the polygenes was greater than that of the two major genes,especial on ALA content.It indicated that it is necessary to employ a larger F2 population to find the plant that accumulate enough minor-effect polygenes for high ALA content.The results are useful for high ALA rapeseed breeding and future work of gene mapping.
基金supported by National Key Research and Development Program of China(2019YFA0210302)the National Natural Science Foundation of China(21878009,21901141)Basic Research Plan for Public Welfare of Zhejiang Province,China(LZY21B060001).
文摘This work presents a route for the study on the absorption performance of gas into liquid under the condition of adding particles in a stirred constant temperature reactor.Two evaluated systems,hydrogen–water and hydrogen–methanol,with the addition of activated carbon particles(ACP)were carried out,respectively.The results showed that the addition of ACP into the water can enhance the mass transfer between hydrogen and water,the enhancement factor increases rapidly with the increase of the ACP content,and then tends to be unchanged.However,for the hydrogen–methanol system,ACP has little effect on the mass transfer performance.In addition,a gas–liquid mass transfer model considering the effect of solid particle enhancement was established based on the shuttle effect and two-film model.Results indicated that the predicted value agreed well with the experimental value in both hydrogen–methanol–ACP and hydrogen–water–ACP systems.
基金the financial support for the research presented in this paper from National Natural Science Foundation of China(42201142,42067066,51778590)。
文摘Loess has distinctive characteristics,leading to frequent landslide disasters and posing serious threats to the lives and properties of local re sidents.The involvement of water repre sents a critical factor in inducing loess landslides.This study focuses on three neighboring cities sequentially situated on the Loess Plateau along the direction of aeolian deposition of loess,namely Lanzhou,Dingxi,and Tianshui,which are densely populated and prone to landslide disasters.The variations in hydraulic properties,including water retention capacity and permeability,are investigated through Soil Water Characteristic Curve(SWCC)test and hydraulic conductivity test.The experimental findings revealed that Tianshui loess exhibited the highest water retention capacity,followed by Dingxi loess,while Lanzhou loess demonstrated the lowest water retention capacity.Contrastingly,the results for the saturated permeability coefficient were found to be the opposite:Tianshui loess showed the lowest permeability,whereas Lanzhou loess displayed the highest permeability.These results are supported and analyzed by scanning electron microscopy(SEM)observation.In addition,the water retention capacity is mathematically expressed using the van Genuchten model and extended to predict unsaturated hydraulic properties of loess.The experimental results exhibit a strong accordance with one another and align with the regional distribution patterns of disasters.
基金the National Natural Science Foundation of China(No.52074349)the Graduate Research Innovation Project of Hunan Province,China(No.CX20230194)。
文摘This study introduces a coupled electromagnetic–thermal–mechanical model to reveal the mechanisms of microcracking and mineral melting of polymineralic rocks under microwave radiation.Experimental tests validate the rationality of the proposed model.Embedding microscopic mineral sections into the granite model for simulation shows that uneven temperature gradients create distinct molten,porous,and nonmolten zones on the fracture surface.Moreover,the varying thermal expansion coefficients and Young's moduli among the minerals induce significant thermal stress at the mineral boundaries.Quartz and biotite with higher thermal expansion coefficients are subjected to compression,whereas plagioclase with smaller coefficients experiences tensile stress.In the molten zone,quartz undergoes transgranular cracking due to theα–βphase transition.The local high temperatures also induce melting phase transitions in biotite and feldspar.This numerical study provides new insights into the distribution of thermal stress and mineral phase changes in rocks under microwave irradiation.
基金financially supported by the National Natural Science Foundation of China(No.22270509)。
文摘The packaging materials with cushioning performance are used to prevent the internal contents from being damaged by the impact and vibration of external forces.The polyurethane microcellular elastomers(PUMEs)can absorb energy through cell collapse and molecular chain creep.In this study,PUMEs with different densities were investigated by scanning electron microscopy,dynamic mechanical analysis and dynamic compression tests.PUMEs exhibited significant im pact resistance and the maximum peak stress attenuation ratio reached 73.33%.The protective equipment was made by PUME with the optimal density of 600 kg/m^(3),and then the acceleration sensing device installed with the same protective equipment fell from a height of 3,5 and 10 m to evaluate the energy-absorbing property and reusability of PUMEs.The results showed that PUMEs equipment reduced the peak acceleration of the device by 93.84%,with a maximum deviation of 9%between actual test and simulation,and shortened the impact time of first landing by 57.39%.In addition,the equipment PUMEs equipment could effectively reduce the stress on the protected items.
基金National Key R&D Program of China(No.2017YFC0803300)the National Natural Science of Foundation of China(No.61703013).
文摘Spark is the most popular in-memory processing framework for big data analytics.Memory is the crucial resource for workloads to achieve performance acceleration on Spark.The extant memory capacity configuration approach in Spark is to statically configure the memory capacity for workloads based on user’s specifications.However,without the deep knowledge of the workload’s system-level characteristics,users in practice often conservatively overestimate the memory utilizations of their workloads and require resource manager to grant more memory share than that they actually need,which leads to the severe waste of memory resources.To address the above issue,SMConf,an automated memory capacity configuration solution for in-memory computing workloads in Spark is proposed.SMConf is designed based on the observation that,though there is not one-size-fit-all proper configuration,the one-size-fit-bunch configuration can be found for in-memory computing workloads.SMConf classifies typical Spark workloads into categories based on metrics across layers of Spark system stack.For each workload category,an individual memory requirement model is learned from the workload’s input data size and the strong-correlated configuration parameters.For an ad-hoc workload,SMConf matches its memory requirement signature to one of the workload categories with small-sized input data and determines its proper memory capacity configuration with the corresponding memory requirement model.Experimental results demonstrate that,compared to the conservative default configuration,SMConf can reduce the memory resource provision to Spark workloads by up to 69%with the slight performance degradation,and reduce the average turnaround time of Spark workloads by up to 55%in the multi-tenant environments.
基金Supported by Huangshan Science and Technology Planning Project(2022KN-02)School-level Key Project of Huangshan University(2022XKJZD004)+2 种基金First-class Discipline in Huangshan University(YLXK202101)Key Project of Natural Science Foundation of Department of Education of Anhui Province(2022AH051953)Innovation Training Program(PX-135245491).
文摘[Objectives]This study was conducted to investigate the control of Chinese herbal medicine regulators on leaf spot nematode disease,the main pest of Chloranthus spicatus(Thunb.)Makino.[Methods]C.spicatus plants infected with nematodes were irrigated with a Chinese herbal medicine regulator at two different concentrations,and the control effect on leaf spot nematode disease of the plant was studied by measuring the number of nematodes,the contents of chlorophyll,malondialdehyde,soluble sugar and free proline in the leaves of the plants in the soil.[Results]Compared with the control,the two concentrations of Chinese herbal medicine regulator significantly reduced the number of nematodes in the soil,increased the contents of chlorophyll(mainly chlorophyll a),soluble sugar and free proline in the leaves of C.spicatus,and decreased the content of malondialdehyde.It indicated that the Chinese herbal medicine regulator could effectively control the spread of nematodes and had certain effect on the recovery of C.spicatus plants.[Conclusions]The use of Chinese herbal medicine regulators is helpful to curb the occurrence of leaf spot nematode disease in C.spicatus by biological prevention and control means,and provides theoretical guidance for the development of the green industry of C.spicatus.
基金supported by the National Natural Science Foundation of China(No.51175123)the National Science and Technology Major Project(No.2013ZX04006011-205)
文摘In order to fabricate a large-aperture continuous phase plate(CPP)using atmospheric pressure plasma processing(APPP)with high efficiency and precision,the position dwell mode and velocity mode were proposed and the iterative calculation method was developed for the non-constant removal rate.Two 320 mm×320 mm×2 mm CPPs were fabricated with two processing modes.The experiment results show that the velocity mode is capable of significantly reducing the processing time and shape error.The total processing time is decreased from 13.2 h to 9.3 h,and the surface shape error is decreased from 0.158λto 0.119λ(λ=632.8 nm)(root mean square).
文摘Al-enabled system simulation and modelling has become useful tools to facilitate humans to understand systems in different do-mains,such as physics,astrophysics,chemistry,biology,economics,engineering and social science.A complex system is featured with a large number of interacting components(agents,processes,etc.),whose aggregate activities are nonlinear and self-organized.Complex systems are hard to be simulated or mod-elled by using traditional computational approaches due to complex relationships among system components,distributed features of resources,and dynamics of environments.Meanwhile,agent and multi-agent systems have demonstrated advantages and great potentials in modelling and simulating complex systems.
基金supported by National Key Research and Development Program of China(grant nos.2021YFA1000200 and 2021YFA1000201)National Natural Science Foundation of China(grant nos.12372175,12102010 and 52363019)+1 种基金Tianjin Municipal Science and Technology Plan Project(grant no.24ZYCGSY00650)Tianjin Health Technology Project(grant no.TJWJ2022XK043).
文摘Gelatin-based biomaterials have emerged as promising candidates for bioadhesives due to their biodegradability and biocompatibility.However,they often face limitations due to the uncontrollable phase transition of gelatin,which is dominated by hydrogen bonds between peptide chains.Here,we developed controllable phase transition gelatin-based(CPTG)bioadhesives by regulating the dynamic balance of hydrogen bonds between the peptide chains using 2-hydroxyethylurea(HU)and punicalagin(PA).These CPTG bioadhesives exhibited significant enhancements in adhesion energy and injectability even at 4℃compared to traditional gelatin bioadhesives.The developed bioadhesives could achieve self-reinforcing interfacial adhesion upon contact with moist wound tissues.This effect was attributed to HU diffusion,which disrupted the dynamic balance of hydrogen bonds and therefore induced a localized structural densification.This process was further facilitated by the presence of pyrogallol from PA.Furthermore,the CPTG bioadhesive could modulate the immune microenvironment,offering antibacterial,antioxidant,and immune-adjustable properties,thereby accelerating diabetic wound healing,as confirmed in a diabetic wound rat model.This proposed design strategy is not only crucial for developing controllable phase-transition bioadhesives for diverse applications,but also paves the way for broadening the potential applications of gelatin-based biomaterials.
