Background:The Teaching Personal and Social Responsibility(TPSR)model in physical education(PE)has been shown to promote Social and emotional competence(SEC).However,the underlying mechanisms through which TPSR enhanc...Background:The Teaching Personal and Social Responsibility(TPSR)model in physical education(PE)has been shown to promote Social and emotional competence(SEC).However,the underlying mechanisms through which TPSR enhances SEC,particularly in university students within the Chinese context,remain unclear.This study aims to explore the effects of TPSR and the mediating roles of self-efficacy and grit in improving SEC.Methods:71 Chinese university students were in the TPSR group,and 39 in the Traditional Teaching Model(TTM)control group,assessed before and after a 14-week intervention.The Adapted Social and Emotional Competence Scale(ASECS),General Self-Efficacy Scale(GSES),and Short Grit Scale(SGS)were used for measurement.A mixed-design ANOVA assessed TPSR’s effects,with post-hoc t-tests for pre-post differences and mediation analysis for underlying mechanisms.Results:The mixed-design ANOVA revealed a significant interaction between time and intervention on SEC.The TPSR group showed significant improvement from pre-test to post-test(t(70)=−2.63,p=0.011,Cohen’s d=−0.31),whereas the TTM control group did not(t(38)=1.40,p=0.170,Cohen’s d=0.22).The TPSR group also showed a significant increase in self-efficacy(t(70)=−3.67,p<0.001,Cohen’s d=−0.44),while no change was observed in the TTM group(t(38)=0.62,p=0.540,Cohen’s d=0.10).No significant effects were found for grit(F=0.342,p=0.560).Mediation analysis confirmed that self-efficacy significantly mediated the effects of the TPSR intervention on SEC(95%CI:0.0277 to 0.2897).Conclusion:The TPSR intervention led to significant improvements in university students’SEC and self-efficacy,with no significant changes observed in grit.Self-efficacy served as a mediator in the relationship between the intervention and SEC.展开更多
A series of Sr_(1-1.5x)Lu_(x)TiO_(3)(x=0,0.005,0.01,0.015,and 0.02)ceramics was sintered under an air at-mosphere through the solid-state reaction method.The results show that doping with Lu^(3+)consid-erably enhances...A series of Sr_(1-1.5x)Lu_(x)TiO_(3)(x=0,0.005,0.01,0.015,and 0.02)ceramics was sintered under an air at-mosphere through the solid-state reaction method.The results show that doping with Lu^(3+)consid-erably enhances material permittivity.The ceramic with x=0.01 exhibits a colossal permittivity(CP)of~101000 with a tanδof~0.16 at a frequency of 1 kHz,demonstrating enhanced stability over a wide temperature(30-300℃)and frequency(102-106 Hz)range.Based on the analysis of dielectric relaxation,X-ray photoelectron spectroscopy(XPS),and the universal dielectric response law,the CP effect is primarily due to the formation of defect dipoles,which are correlated with the presence of oxygen vacancies,such as Ti^(3+)-V_(O)^(¨)-Ti^(3+),V_(Sr)″-V_(O)^(¨),LuTi′-V_(O)^(¨)-Ti^(3+),and Lu_(Sr)·-Lu_(Ti)′-V_(O)^(¨)-Ti^(3+).These defect dipoles serve to pin electrons,limiting long-range transitions,and enhancing local po-larization.Doping with Lu^(3+)also induces a secondary Lu_(2)Ti_(2)O_(7)phase,which was characterized by X-ray diffraction(XRD)and energy-dispersive X-ray spectroscopy(EDS).The results generated in this study can inform the development and application of new CP materials based on SrTiO_(3).展开更多
The flow and heat transfer of molten GaAs under the interaction of buoyancy, Marangoni and crystal rotation in the Czochralski configuration are numerically studied by using a time-dependent and three-dimensional turb...The flow and heat transfer of molten GaAs under the interaction of buoyancy, Marangoni and crystal rotation in the Czochralski configuration are numerically studied by using a time-dependent and three-dimensional turbulent flow model for the first time. The transition from axisymmetric flow to non-axisymmetric flow and then returning to axisymmetric flow again with increasing centrifugal and coriolis forces by increasing the crystal rotation rate was numerically observed. The origin of the transition to non-axisymmetric flow has been proved to be baroclinic instability. Several important characteristics of baroclinic instability in the CZ GaAs melt have been predicted. These characteristics are found to be in agreement with experimental observations.展开更多
Urbanization-induced warming has advanced the timing of spring budburst,with significant implications for urban ecosystems.However,how urban artificial light affects the spring budburst and its spatial variation withi...Urbanization-induced warming has advanced the timing of spring budburst,with significant implications for urban ecosystems.However,how urban artificial light affects the spring budburst and its spatial variation within species distribution remain underexplored,especially lacking experimental evidences.Here,we conducted a climate-controlled experiment using twigs collected conditions with and without artificial light(AL and NoAL,respectively)across three latitudinal gradients(Lhigh,Lmiddle and Llow)in China.In this study,we quantified the temperature responsiveness of spring budburst(Tres),defined as the number of days to budburst after twigs were placed in growth chambers,with a smaller value indicating stronger responsiveness.Results showed that NoAL individuals had significantly higher temperature responsiveness(54.3 days)than AL individuals(60.7 days).Additionally,AL twigs exhibited greater photoperiod limitation(12.7 days vs.7.6 days)and higher heat requirement(732.15 K vs.679.15 K)than NoAL twigs,suggesting adaptation to longer photoperiods and elevated thermal thresholds for budburst in AL-exposed individuals.More importantly,Tres difference between AL and NoAL individuals was more pronounced at higher latitudes(5.8 days at Lhigh,12.2 days at Lmiddle)than at lower latitudes(0.7 days at Llow),possibly due to higher inter-annual temperature variability in northern regions.Our findings provide experimental evidence of artificial light effects on tree phenology and highlight the importance of considering urban tree adaptability when assessing phenological responses to climate change in urban environments.展开更多
As for the drop of particle diversity and the slow convergent speed of particle in the late evolution period when particle swarm optimization（PSO） is applied to solve high-dimensional multi-modal functions,a hybrid ...As for the drop of particle diversity and the slow convergent speed of particle in the late evolution period when particle swarm optimization（PSO） is applied to solve high-dimensional multi-modal functions,a hybrid optimization algorithm based on the cat mapping,the cloud model and PSO is proposed.While the PSO algorithm evolves a certain of generations,this algorithm applies the cat mapping to implement global disturbance of the poorer individuals,and employs the cloud model to execute local search of the better individuals;accordingly,the obtained best individuals form a new swarm.For this new swarm,the evolution operation is maintained with the PSO algorithm,using the parameter of pop distr to balance the global and local search capacity of the algorithm,as well as,adopting the parameter of mix gen to control mixing times of the algorithm.The comparative analysis is carried out on the basis of 4 functions and other algorithms.It indicates that this algorithm shows faster convergent speed and better solving precision for solving functions particularly those high-dimensional multi-modal functions.Finally,the suggested values are proposed for parameters pop distr and mix gen applied to different dimension functions via the comparative analysis of parameters.展开更多
Colorectal carcinoma(CRC),the third most commonly diagnosed cancer,accounts for 9.7%of all newly diagnosed cancer cases and 9.4%of cancer-related deaths globally.1 Recent studies have demonstrated that post-transcript...Colorectal carcinoma(CRC),the third most commonly diagnosed cancer,accounts for 9.7%of all newly diagnosed cancer cases and 9.4%of cancer-related deaths globally.1 Recent studies have demonstrated that post-transcriptional RNA modifications,such as N^(6)-methyladenosine,N^(5)-methylcytosine,and N^(7)-methylguanosine,play critical roles in the regulation of mRNA stability and translation,primary microRNA processing,and lncRNA-protein complex that contributes to the progression of human cancer.展开更多
The microstructure evolution of mechanical alloyed Mo-66.7%Si powder using the high-energy ball mill has been studied by X-ray diffraction and scanning electron microscopy. The results showed that MoSi2 can be synthes...The microstructure evolution of mechanical alloyed Mo-66.7%Si powder using the high-energy ball mill has been studied by X-ray diffraction and scanning electron microscopy. The results showed that MoSi2 can be synthesized by MA of Mo-66.7%Si powder mixtures. Cold welding behavior between Mo and Si powders plays an important role in the preparation of MoSi2 by the MA.展开更多
Sowing depth has an important impact on the performance of no-tillage planters,it is one of the key factors to ensure rapid germination.However,the consistency of sowing depth is easily affected by the complex environ...Sowing depth has an important impact on the performance of no-tillage planters,it is one of the key factors to ensure rapid germination.However,the consistency of sowing depth is easily affected by the complex environment of no-tillage operation.In order to improve the performance of no-tillage planters and improve the control precision of sowing depth,an intelligent depth regulation system was designed.Three Flex sensors installed on the inner surface of the gauge wheel at 120°intervals were used to monitor the downward force exerted by the seeding row unit against ground.The peak value of the output voltage of the sensor increased linearly with the increase of the downward force.In addition,the pneumatic spring was used as a downforce generator,and its intelligent regulation model was established by the Mamdani fuzzy algorithm,which can realize the control of the downward force exerted by the seeding row unit against ground and ensure the proper seeding depth.The working process was simulated based on MATLAB-Simulink,and the results showed that the Mamdani fuzzy model performed well in changing the pressure against ground.Field results showed that when the operating speed was 6 km/h,8 km/h and 10 km/h,the error of the system’s control of sowing depth was±9 mm,±12 mm,and±22 mm,respectively,and its sowing performance was significantly higher than that of the unadjusted passive operation.展开更多
In Northeast China under no-till conditions the amount of maize stubble of the previous year's crop severely limit the quality of sowing operations by unstable operating depth of normal planter row cleaners.Thus,i...In Northeast China under no-till conditions the amount of maize stubble of the previous year's crop severely limit the quality of sowing operations by unstable operating depth of normal planter row cleaners.Thus,in this study,bionic mole forelimb intelligent row cleaners comprising of a cleaning device and a depth intelligent control system were designed.Via theoretical analysis,computer-based simulation,and test optimized design,the mechanism of bionic cleaners that possessed the forelimb motion morphology and the front claw toe structural morphology of moles was studied,the effects of structural parameters of bionic cleaners on the cleaning quality were clarified.Based on a pressure sensor,a depth intelligent control system was designed,which enhanced the depth stability of the cleaning devices.The types of bionic cleaners were identified by simulation on EDEM software.Then regression equations between different parameters and operation evaluation indices were established,and the optimal parameter combination was identified on Design-Expert software with a rotation radius of 150 mm and a motion deflection angle of 15.8°,at which the cleaning rate was 91.3%.Field tests under the optimal parameter combination showed that bionic cleaners outperformed normal planar cleaners,and the depth intelligent control system could efficiently improve the performance of the row cleaners.The straw cleaning rate of the bionic mole forelimb intelligent row cleaners under total straw mulching fields was 90.9%,which was 21.3%higher than that of normal cleaners,and the ground surfaces after operation satisfied the agricultural requirements of maize no-tillage sowing.展开更多
Lanchester equations and their extensions are widely used to calculate attrition in warfare models. The current paper addresses the warfare command decision-making problem for winning when the total combats capability...Lanchester equations and their extensions are widely used to calculate attrition in warfare models. The current paper addresses the warfare command decision-making problem for winning when the total combats capability of the attacking side is not superior to that of the defending side. For this problem, the corresponding warfare command stratagems, which can transform the battlefield situation, are proposed and analyzed quantitatively by considering the influence of the warfare information factor. The application examples in military conflicts show the feasibility and effectiveness of the proposed model and the warfare command stratagems for winning. The research results may provide a theoretical reference for warfare command decision making.展开更多
This paper proposes a new algorithm—binary glowworm swarm optimization(BGSO)to solve the unit commitment(UC)problem.After a certain quantity of initial feasible solutions is obtained by using the priority list and th...This paper proposes a new algorithm—binary glowworm swarm optimization(BGSO)to solve the unit commitment(UC)problem.After a certain quantity of initial feasible solutions is obtained by using the priority list and the decommitment of redundant unit,BGSO is applied to optimize the on/off state of the unit,and the Lambda-iteration method is adopted to solve the economic dispatch problem.In the iterative process,the solutions that do not satisfy all the constraints are adjusted by the correction method.Furthermore,different adjustment techniques such as conversion from cold start to hot start,decommitment of redundant unit,are adopted to avoid falling into local optimal solution and to keep the diversity of the feasible solutions.The proposed BGSO is tested on the power system in the range of 10–140 generating units for a 24-h scheduling period and compared to quantuminspired evolutionary algorithm(QEA),improved binary particle swarm optimization(IBPSO)and mixed integer programming(MIP).Simulated results distinctly show that BGSO is very competent in solving the UC problem in comparison to the previously reported algorithms.展开更多
Mechanical weeding not only avoids crop herbicide residue but also protects the ecological environment.Compared with mechanical inter-row weeding,mechanical intra-row weeding needs to avoid crop plants,which is conduc...Mechanical weeding not only avoids crop herbicide residue but also protects the ecological environment.Compared with mechanical inter-row weeding,mechanical intra-row weeding needs to avoid crop plants,which is conducive to causing a higher rate of seedling damage.In order to realize maize(Zea mays L.)intra-row weeding,a maize intra-row weeding mechanism was designed in this study.The mechanism can detect maize seedlings by infrared beam tube,then a sliding-cutting bevel tool moves spirally amid maize seedlings,so as to eradicate intra-row weeds.A field experiment was conducted under the following experimental conditions:the bevel tool rotation speed was 800-1400 r/min,the mechanism forward speed was 4-7 km/h,and the bevel tool depth was 2-14 cm,the experimental results illustrated that the mechanism’s average weeding rate and seedling damage rate were 95.8%and 0.6%,respectively.The variance analysis showed that the primary and secondary factors that affecting the weeding rate and seedling damage rate were the same,which were bevel tool rotation speed,mechanism forward speed,bevel tool depth in soil in a descending order according to the significances.The result of the field experiment may provide a reference for intra-row weeding device design.展开更多
Soil nitrogen is an essential nutrient element for crop growth and development,and an important indicator of soil fertility characteristics.This study proposed a method based on pyrolysis and artificial olfaction to q...Soil nitrogen is an essential nutrient element for crop growth and development,and an important indicator of soil fertility characteristics.This study proposed a method based on pyrolysis and artificial olfaction to quickly and accurately determine the soil total nitrogen(STN)content.A muffle furnace was used to pyrolyze the soil samples,and ten different types of oxide semiconductor gas sensors were used to construct a sensor array to detect the soil samples’pyrolysis gas.The response curves of the sensors were tested at pyrolysis temperatures of 200℃,300℃,400℃,and 500℃ and at pyrolysis times of 1 min,3 min,5 min,and 10 min to obtain the optimal pyrolysis state of the soil samples.The optimal pyrolysis temperature was 400℃,and the pyrolysis time was 3 min.The response area,maximum value,average differential coefficient,variance value,maximum gradient value,average value,and 8th-second transient value of the sensor response curve were extracted to construct an artificial olfactory feature space of 121×10×7(121 soil samples,ten sensor numbers,seven extracted eigenvalues).Back-propagation neural network algorithm(BPNN),partial least squares regression algorithm(PLSR),and partial least squares regression combined with back-propagation neural network algorithm(PLSR-BPNN)were used to establish a prediction model of artificial olfactory feature space and STN content.Moreover,coefficient of determination(R2),root mean square error(RMSE),and the ratio of performance to deviation(RPD)were used as the performance indicators of the prediction results.The test results showed that the R2 of the PLSR,BPNN,and PLSR-BPNN models were 0.89033,0.81185,and 0.92186,and the RMSE values were 0.24297,0.37370,and 0.21781,and the RPD were 2.9964,1.9482,and 3.3426,respectively.The model established by the PLSR-BPNN algorithm has the highest R2 and RPD and the smallest RMSE,can achieve the accurate prediction of STN content,and therefore the model is rated as“excellent”.The detection method in this study achieves a low-cost,rapid,and accurate determination of STN content,and provides a new reference for the measurement of STN.展开更多
Background:N^(6)-methyladenosine(m^(6)A)modifications of mRNA and long non-coding RNA(lncRNAs)are known to play a significant role in regulation of gene expression and organismal development.Besides writer and eraser ...Background:N^(6)-methyladenosine(m^(6)A)modifications of mRNA and long non-coding RNA(lncRNAs)are known to play a significant role in regulation of gene expression and organismal development.Besides writer and eraser proteins of this dynamic modification,the YT521-B homology(YTH)domain can recognize the modification involved in numerous cellular processes.The function of proteins containing YTH domain and its binding mode with N^(6)-methyladenosine RNA has attracted considerable attention.However,the structural and dynamic characteristics of the YTH domain in complex with m^(6)A RNA is still unknown.Method:This work presents results of accelerated molecular dynamics(aMD)simulations at the timescale of microseconds.Principal component analysis(PCA),molecular mechanics generalized Born surface area(MM/GBSA)calculations,contact analysis and contact-based principal component analysis(conPCA)provide new insights into structure and dynamics of the YTH-RNA complex.Results:The aMD simulations indicate that the recognition loop has a larger movement away from the binding pocket in the YTH-A3 RNA than that in the YTH-m^(6)A3 RNA.In aMD trajectories of the apo YTH,there is a significant close-open transition of the recognition loop,that is to say,the apo YTH can take both the closed and open structure.We have found that the YTH domain binds more favorably to the methylated RNA than the nonmethylated RNA.The per-residue free energy decomposition and conPCA suggest that hydrophobic residues including W380,L383-V385,W431-P434,M437,and M441-L442,may play important roles in favorable binding of the m^(6)A RNA to the YTH domain,which is also supported by aMD simulations of a double mutated system(L383A/M437A).Conclusion:The results are in good agreement with higher structural stability of the YTH-m^(6)A RNA than that of the YTH-A3 RNA.The addition of a methylation group on A3 can enhance its binding to the hydrophobic pocket in the YTH domain.Our simulations support a‘conformational selection’mechanism between the YTH-RNA binding.This work may aid in our understanding of the structural and dynamic characteristics of the YTH protein in complex with the methylated RNA.展开更多
基金funded by the 2023 Scientific Research Platforms and Projects of Guangdong Provincial Education Department,Grant Number 2023WQNCX079.
文摘Background:The Teaching Personal and Social Responsibility(TPSR)model in physical education(PE)has been shown to promote Social and emotional competence(SEC).However,the underlying mechanisms through which TPSR enhances SEC,particularly in university students within the Chinese context,remain unclear.This study aims to explore the effects of TPSR and the mediating roles of self-efficacy and grit in improving SEC.Methods:71 Chinese university students were in the TPSR group,and 39 in the Traditional Teaching Model(TTM)control group,assessed before and after a 14-week intervention.The Adapted Social and Emotional Competence Scale(ASECS),General Self-Efficacy Scale(GSES),and Short Grit Scale(SGS)were used for measurement.A mixed-design ANOVA assessed TPSR’s effects,with post-hoc t-tests for pre-post differences and mediation analysis for underlying mechanisms.Results:The mixed-design ANOVA revealed a significant interaction between time and intervention on SEC.The TPSR group showed significant improvement from pre-test to post-test(t(70)=−2.63,p=0.011,Cohen’s d=−0.31),whereas the TTM control group did not(t(38)=1.40,p=0.170,Cohen’s d=0.22).The TPSR group also showed a significant increase in self-efficacy(t(70)=−3.67,p<0.001,Cohen’s d=−0.44),while no change was observed in the TTM group(t(38)=0.62,p=0.540,Cohen’s d=0.10).No significant effects were found for grit(F=0.342,p=0.560).Mediation analysis confirmed that self-efficacy significantly mediated the effects of the TPSR intervention on SEC(95%CI:0.0277 to 0.2897).Conclusion:The TPSR intervention led to significant improvements in university students’SEC and self-efficacy,with no significant changes observed in grit.Self-efficacy served as a mediator in the relationship between the intervention and SEC.
基金Project supported by the fund of the Major Science and Technology Programs of Yunnan Province(202102AB080008)the Science and Technology Program of Yunnan Precious Metal Laboratory(YPML-2022050205,YPML-2022050219)。
文摘A series of Sr_(1-1.5x)Lu_(x)TiO_(3)(x=0,0.005,0.01,0.015,and 0.02)ceramics was sintered under an air at-mosphere through the solid-state reaction method.The results show that doping with Lu^(3+)consid-erably enhances material permittivity.The ceramic with x=0.01 exhibits a colossal permittivity(CP)of~101000 with a tanδof~0.16 at a frequency of 1 kHz,demonstrating enhanced stability over a wide temperature(30-300℃)and frequency(102-106 Hz)range.Based on the analysis of dielectric relaxation,X-ray photoelectron spectroscopy(XPS),and the universal dielectric response law,the CP effect is primarily due to the formation of defect dipoles,which are correlated with the presence of oxygen vacancies,such as Ti^(3+)-V_(O)^(¨)-Ti^(3+),V_(Sr)″-V_(O)^(¨),LuTi′-V_(O)^(¨)-Ti^(3+),and Lu_(Sr)·-Lu_(Ti)′-V_(O)^(¨)-Ti^(3+).These defect dipoles serve to pin electrons,limiting long-range transitions,and enhancing local po-larization.Doping with Lu^(3+)also induces a secondary Lu_(2)Ti_(2)O_(7)phase,which was characterized by X-ray diffraction(XRD)and energy-dispersive X-ray spectroscopy(EDS).The results generated in this study can inform the development and application of new CP materials based on SrTiO_(3).
基金supported by the National Natural Science Foundation of China(NSFC)under grant No.50376078the Second-Term National 985 Project within Research Center of Biological Function Information and Instruments of Chongqing University.
文摘The flow and heat transfer of molten GaAs under the interaction of buoyancy, Marangoni and crystal rotation in the Czochralski configuration are numerically studied by using a time-dependent and three-dimensional turbulent flow model for the first time. The transition from axisymmetric flow to non-axisymmetric flow and then returning to axisymmetric flow again with increasing centrifugal and coriolis forces by increasing the crystal rotation rate was numerically observed. The origin of the transition to non-axisymmetric flow has been proved to be baroclinic instability. Several important characteristics of baroclinic instability in the CZ GaAs melt have been predicted. These characteristics are found to be in agreement with experimental observations.
基金supported by the International Cooperation and Exchange of the National Natural Science Foundation of China-FAPESP Program(Grant no.42261144755)the National Key Research and Development Program(2023YFF0805604)+1 种基金the Fundamental Research Funds for the Central Universities(no.2243300004)Z.W.was funded by the China Scholarship Council(no.202206040112).
文摘Urbanization-induced warming has advanced the timing of spring budburst,with significant implications for urban ecosystems.However,how urban artificial light affects the spring budburst and its spatial variation within species distribution remain underexplored,especially lacking experimental evidences.Here,we conducted a climate-controlled experiment using twigs collected conditions with and without artificial light(AL and NoAL,respectively)across three latitudinal gradients(Lhigh,Lmiddle and Llow)in China.In this study,we quantified the temperature responsiveness of spring budburst(Tres),defined as the number of days to budburst after twigs were placed in growth chambers,with a smaller value indicating stronger responsiveness.Results showed that NoAL individuals had significantly higher temperature responsiveness(54.3 days)than AL individuals(60.7 days).Additionally,AL twigs exhibited greater photoperiod limitation(12.7 days vs.7.6 days)and higher heat requirement(732.15 K vs.679.15 K)than NoAL twigs,suggesting adaptation to longer photoperiods and elevated thermal thresholds for budburst in AL-exposed individuals.More importantly,Tres difference between AL and NoAL individuals was more pronounced at higher latitudes(5.8 days at Lhigh,12.2 days at Lmiddle)than at lower latitudes(0.7 days at Llow),possibly due to higher inter-annual temperature variability in northern regions.Our findings provide experimental evidence of artificial light effects on tree phenology and highlight the importance of considering urban tree adaptability when assessing phenological responses to climate change in urban environments.
基金supported by the Specialized Research Fund for the Doctoral Program of Higher Education(20114307120032)the National Natural Science Foundation of China(71201167)
文摘As for the drop of particle diversity and the slow convergent speed of particle in the late evolution period when particle swarm optimization（PSO） is applied to solve high-dimensional multi-modal functions,a hybrid optimization algorithm based on the cat mapping,the cloud model and PSO is proposed.While the PSO algorithm evolves a certain of generations,this algorithm applies the cat mapping to implement global disturbance of the poorer individuals,and employs the cloud model to execute local search of the better individuals;accordingly,the obtained best individuals form a new swarm.For this new swarm,the evolution operation is maintained with the PSO algorithm,using the parameter of pop distr to balance the global and local search capacity of the algorithm,as well as,adopting the parameter of mix gen to control mixing times of the algorithm.The comparative analysis is carried out on the basis of 4 functions and other algorithms.It indicates that this algorithm shows faster convergent speed and better solving precision for solving functions particularly those high-dimensional multi-modal functions.Finally,the suggested values are proposed for parameters pop distr and mix gen applied to different dimension functions via the comparative analysis of parameters.
基金supported by the Science and Technology Foundation of Shenzhen,Guangdong,China(No.JCYJ20210324115800001)the Natural Science Foundation of Guangdong Province,China(No.2018A0303130278)+1 种基金the Basic and Applied Basic Research of Guangdong Province,China(No.2021A1515110253)the Shenzhen Key Medical Discipline Construction Fund(China)(No.SZXK053).
文摘Colorectal carcinoma(CRC),the third most commonly diagnosed cancer,accounts for 9.7%of all newly diagnosed cancer cases and 9.4%of cancer-related deaths globally.1 Recent studies have demonstrated that post-transcriptional RNA modifications,such as N^(6)-methyladenosine,N^(5)-methylcytosine,and N^(7)-methylguanosine,play critical roles in the regulation of mRNA stability and translation,primary microRNA processing,and lncRNA-protein complex that contributes to the progression of human cancer.
文摘The microstructure evolution of mechanical alloyed Mo-66.7%Si powder using the high-energy ball mill has been studied by X-ray diffraction and scanning electron microscopy. The results showed that MoSi2 can be synthesized by MA of Mo-66.7%Si powder mixtures. Cold welding behavior between Mo and Si powders plays an important role in the preparation of MoSi2 by the MA.
基金by the National Key R&D Plan Project(Grant No.2016YFD070030201)。
文摘Sowing depth has an important impact on the performance of no-tillage planters,it is one of the key factors to ensure rapid germination.However,the consistency of sowing depth is easily affected by the complex environment of no-tillage operation.In order to improve the performance of no-tillage planters and improve the control precision of sowing depth,an intelligent depth regulation system was designed.Three Flex sensors installed on the inner surface of the gauge wheel at 120°intervals were used to monitor the downward force exerted by the seeding row unit against ground.The peak value of the output voltage of the sensor increased linearly with the increase of the downward force.In addition,the pneumatic spring was used as a downforce generator,and its intelligent regulation model was established by the Mamdani fuzzy algorithm,which can realize the control of the downward force exerted by the seeding row unit against ground and ensure the proper seeding depth.The working process was simulated based on MATLAB-Simulink,and the results showed that the Mamdani fuzzy model performed well in changing the pressure against ground.Field results showed that when the operating speed was 6 km/h,8 km/h and 10 km/h,the error of the system’s control of sowing depth was±9 mm,±12 mm,and±22 mm,respectively,and its sowing performance was significantly higher than that of the unadjusted passive operation.
基金This work was financially supported by the National Key R&D Plan project(Grant No.2016YFD070030201)the Jilin Science and Technology Development Plan(20160309001NY)。
文摘In Northeast China under no-till conditions the amount of maize stubble of the previous year's crop severely limit the quality of sowing operations by unstable operating depth of normal planter row cleaners.Thus,in this study,bionic mole forelimb intelligent row cleaners comprising of a cleaning device and a depth intelligent control system were designed.Via theoretical analysis,computer-based simulation,and test optimized design,the mechanism of bionic cleaners that possessed the forelimb motion morphology and the front claw toe structural morphology of moles was studied,the effects of structural parameters of bionic cleaners on the cleaning quality were clarified.Based on a pressure sensor,a depth intelligent control system was designed,which enhanced the depth stability of the cleaning devices.The types of bionic cleaners were identified by simulation on EDEM software.Then regression equations between different parameters and operation evaluation indices were established,and the optimal parameter combination was identified on Design-Expert software with a rotation radius of 150 mm and a motion deflection angle of 15.8°,at which the cleaning rate was 91.3%.Field tests under the optimal parameter combination showed that bionic cleaners outperformed normal planar cleaners,and the depth intelligent control system could efficiently improve the performance of the row cleaners.The straw cleaning rate of the bionic mole forelimb intelligent row cleaners under total straw mulching fields was 90.9%,which was 21.3%higher than that of normal cleaners,and the ground surfaces after operation satisfied the agricultural requirements of maize no-tillage sowing.
基金partially supported by the National Natural Science Foundation of China under Grant No 60774097 and 11171301by the Fundamental Research Funds for the Central Universities under Grant No N100604019
文摘Lanchester equations and their extensions are widely used to calculate attrition in warfare models. The current paper addresses the warfare command decision-making problem for winning when the total combats capability of the attacking side is not superior to that of the defending side. For this problem, the corresponding warfare command stratagems, which can transform the battlefield situation, are proposed and analyzed quantitatively by considering the influence of the warfare information factor. The application examples in military conflicts show the feasibility and effectiveness of the proposed model and the warfare command stratagems for winning. The research results may provide a theoretical reference for warfare command decision making.
文摘This paper proposes a new algorithm—binary glowworm swarm optimization(BGSO)to solve the unit commitment(UC)problem.After a certain quantity of initial feasible solutions is obtained by using the priority list and the decommitment of redundant unit,BGSO is applied to optimize the on/off state of the unit,and the Lambda-iteration method is adopted to solve the economic dispatch problem.In the iterative process,the solutions that do not satisfy all the constraints are adjusted by the correction method.Furthermore,different adjustment techniques such as conversion from cold start to hot start,decommitment of redundant unit,are adopted to avoid falling into local optimal solution and to keep the diversity of the feasible solutions.The proposed BGSO is tested on the power system in the range of 10–140 generating units for a 24-h scheduling period and compared to quantuminspired evolutionary algorithm(QEA),improved binary particle swarm optimization(IBPSO)and mixed integer programming(MIP).Simulated results distinctly show that BGSO is very competent in solving the UC problem in comparison to the previously reported algorithms.
基金supported by the National Natural Science Foundation of China(Grant No.31901408).
文摘Mechanical weeding not only avoids crop herbicide residue but also protects the ecological environment.Compared with mechanical inter-row weeding,mechanical intra-row weeding needs to avoid crop plants,which is conducive to causing a higher rate of seedling damage.In order to realize maize(Zea mays L.)intra-row weeding,a maize intra-row weeding mechanism was designed in this study.The mechanism can detect maize seedlings by infrared beam tube,then a sliding-cutting bevel tool moves spirally amid maize seedlings,so as to eradicate intra-row weeds.A field experiment was conducted under the following experimental conditions:the bevel tool rotation speed was 800-1400 r/min,the mechanism forward speed was 4-7 km/h,and the bevel tool depth was 2-14 cm,the experimental results illustrated that the mechanism’s average weeding rate and seedling damage rate were 95.8%and 0.6%,respectively.The variance analysis showed that the primary and secondary factors that affecting the weeding rate and seedling damage rate were the same,which were bevel tool rotation speed,mechanism forward speed,bevel tool depth in soil in a descending order according to the significances.The result of the field experiment may provide a reference for intra-row weeding device design.
基金This work was financially supported by the Jilin Science and Technology Development Plan(Grant No.20200502007NC).
文摘Soil nitrogen is an essential nutrient element for crop growth and development,and an important indicator of soil fertility characteristics.This study proposed a method based on pyrolysis and artificial olfaction to quickly and accurately determine the soil total nitrogen(STN)content.A muffle furnace was used to pyrolyze the soil samples,and ten different types of oxide semiconductor gas sensors were used to construct a sensor array to detect the soil samples’pyrolysis gas.The response curves of the sensors were tested at pyrolysis temperatures of 200℃,300℃,400℃,and 500℃ and at pyrolysis times of 1 min,3 min,5 min,and 10 min to obtain the optimal pyrolysis state of the soil samples.The optimal pyrolysis temperature was 400℃,and the pyrolysis time was 3 min.The response area,maximum value,average differential coefficient,variance value,maximum gradient value,average value,and 8th-second transient value of the sensor response curve were extracted to construct an artificial olfactory feature space of 121×10×7(121 soil samples,ten sensor numbers,seven extracted eigenvalues).Back-propagation neural network algorithm(BPNN),partial least squares regression algorithm(PLSR),and partial least squares regression combined with back-propagation neural network algorithm(PLSR-BPNN)were used to establish a prediction model of artificial olfactory feature space and STN content.Moreover,coefficient of determination(R2),root mean square error(RMSE),and the ratio of performance to deviation(RPD)were used as the performance indicators of the prediction results.The test results showed that the R2 of the PLSR,BPNN,and PLSR-BPNN models were 0.89033,0.81185,and 0.92186,and the RMSE values were 0.24297,0.37370,and 0.21781,and the RPD were 2.9964,1.9482,and 3.3426,respectively.The model established by the PLSR-BPNN algorithm has the highest R2 and RPD and the smallest RMSE,can achieve the accurate prediction of STN content,and therefore the model is rated as“excellent”.The detection method in this study achieves a low-cost,rapid,and accurate determination of STN content,and provides a new reference for the measurement of STN.
基金the National Natural Science Foundation of China(No.91953101)the Strategic Priority Research Program of the Chinese Academy of Science(No.XDB37040202).
文摘Background:N^(6)-methyladenosine(m^(6)A)modifications of mRNA and long non-coding RNA(lncRNAs)are known to play a significant role in regulation of gene expression and organismal development.Besides writer and eraser proteins of this dynamic modification,the YT521-B homology(YTH)domain can recognize the modification involved in numerous cellular processes.The function of proteins containing YTH domain and its binding mode with N^(6)-methyladenosine RNA has attracted considerable attention.However,the structural and dynamic characteristics of the YTH domain in complex with m^(6)A RNA is still unknown.Method:This work presents results of accelerated molecular dynamics(aMD)simulations at the timescale of microseconds.Principal component analysis(PCA),molecular mechanics generalized Born surface area(MM/GBSA)calculations,contact analysis and contact-based principal component analysis(conPCA)provide new insights into structure and dynamics of the YTH-RNA complex.Results:The aMD simulations indicate that the recognition loop has a larger movement away from the binding pocket in the YTH-A3 RNA than that in the YTH-m^(6)A3 RNA.In aMD trajectories of the apo YTH,there is a significant close-open transition of the recognition loop,that is to say,the apo YTH can take both the closed and open structure.We have found that the YTH domain binds more favorably to the methylated RNA than the nonmethylated RNA.The per-residue free energy decomposition and conPCA suggest that hydrophobic residues including W380,L383-V385,W431-P434,M437,and M441-L442,may play important roles in favorable binding of the m^(6)A RNA to the YTH domain,which is also supported by aMD simulations of a double mutated system(L383A/M437A).Conclusion:The results are in good agreement with higher structural stability of the YTH-m^(6)A RNA than that of the YTH-A3 RNA.The addition of a methylation group on A3 can enhance its binding to the hydrophobic pocket in the YTH domain.Our simulations support a‘conformational selection’mechanism between the YTH-RNA binding.This work may aid in our understanding of the structural and dynamic characteristics of the YTH protein in complex with the methylated RNA.
