Maize rough dwarf disease is a common epidemic disease in large areas.Its epidemic and occurrence mechanism is a complex process.In this paper,the epidemiological characteristics and influencing factors of maize rough...Maize rough dwarf disease is a common epidemic disease in large areas.Its epidemic and occurrence mechanism is a complex process.In this paper,the epidemiological characteristics and influencing factors of maize rough dwarf disease in Huang-Huai-Hai plain were elaborated based on the research results of maize rough dwarf disease at home and abroad for many years.The epidemic of maize rough dwarf disease is affected by many factors,such as the occurrence and virus carrying rate of the first generation small brown planthopper,accumulation of virus sources on gramineous crops and weed hosts,maize variety resistance,maize sowing date,maize growth period,crop layout,tillage system,climate and ecological environment.The key factors causing the outbreak and epidemic of maize rough dwarf disease are the planting of maize susceptible varieties,the meeting of maize seedling stage and the peak period of adult spread of the first generation of small brown planthopper.展开更多
On-chip couplers are essential for coupling free-space electromagnetic waves into sub-wavelength semiconductor devices and enhancing light-matter interactions.However,the couplers used in existing single field-effect ...On-chip couplers are essential for coupling free-space electromagnetic waves into sub-wavelength semiconductor devices and enhancing light-matter interactions.However,the couplers used in existing single field-effect transistor(FET)detectors exhibit poor response over wide frequency ranges,making the detection of ultra-wideband weak signals highly challenging.In this work,we introduce a meta-array coupler for terahertz detectors based on field-effect transistors,which demonstrates exceptional coupling asymmetry beneath the gate.To optimize the meta-array structure for high gain across an ultra-wide frequency range,we propose a hybrid long short-term memory–multi-layer perceptron(LSTM-MLP)neural network for the detector’s on-chip coupler.This method enables accurate and rapid prediction of the enhanced spectra of meta-atoms,facilitating efficient conversion from structural parameters to resonance frequencies.Compared to traditional dipole couplers,the proposed metacoupler generates strong localized electric field enhancement through dipole resonance,achieving a mixing factor asymmetry up to 246 times higher near 660 GHz and an antenna factor enhancement of approximately 50 times.The meta-array coupled FET terahertz detector achieves ultra-wideband resonance enhancement from 350 to1000 GHz.This hardware architecture and hybrid LSTM-MLP neural network are expected to overcome the limitations of current FET-based detectors in coupling efficiency,bridging the performance gap toward ultra-sensitive detection applications.展开更多
Background:Pulmonary artery systolic pressure(PASP)has often been evaluated as an indicator of heart failure,but the relationship between PASP and the prognosis of elderly patients with acute myocardial infarction(AMI...Background:Pulmonary artery systolic pressure(PASP)has often been evaluated as an indicator of heart failure,but the relationship between PASP and the prognosis of elderly patients with acute myocardial infarction(AMI)is not well understood.Methods:The medical data of 3460 hospitalized elderly patients diagnosed with AMI between January 2013 and June 2018 were reviewed.PASP was calculated usingtransthoracic color Doppler ultrasonography.Patients were grouped accordingtotheir admission PASP results as follows:Group A,PASP≤30 mmHg;Group B,30 mmHg<PASP≤50 mmHg;and Group C,PASP≥51 mmHg.The primary endpoint was all-cause death 6 months following AMI.Multiple Cox regression analysis was used to identify independent risk factors for 6-month mortality in elderly patients with AMI.Results:PASP was associated with age,Killip classification,AMI site,and decreased ejection fraction in elderly patients.After adjusting for clinical and echocardiographic parameters in the Cox model,PASP was found to be significantly related to all-cause mortality.In receiver operating characteristic analysis,a PASP of>34 mmHg had a sensitivity of 62.3%and specificity of 65.7%for predicting 6-month all-cause death after AMI.Conclusion:PASP at admission is a useful marker for predicting short-term mortality in elderly patients with AMI.This finding could be used to help identify high-risk patients and make appropriate clinical decisions.展开更多
基金Supported by the National Key Research and Development Program of China(2018YFD0200603)the Key Research and Development Program of Shandong Province(2018GSF121029)the Innovation Project for Agricultural Sciences of Shandong Academy of Agricultural Sciences(CXGC2016B11-Green Control)
文摘Maize rough dwarf disease is a common epidemic disease in large areas.Its epidemic and occurrence mechanism is a complex process.In this paper,the epidemiological characteristics and influencing factors of maize rough dwarf disease in Huang-Huai-Hai plain were elaborated based on the research results of maize rough dwarf disease at home and abroad for many years.The epidemic of maize rough dwarf disease is affected by many factors,such as the occurrence and virus carrying rate of the first generation small brown planthopper,accumulation of virus sources on gramineous crops and weed hosts,maize variety resistance,maize sowing date,maize growth period,crop layout,tillage system,climate and ecological environment.The key factors causing the outbreak and epidemic of maize rough dwarf disease are the planting of maize susceptible varieties,the meeting of maize seedling stage and the peak period of adult spread of the first generation of small brown planthopper.
基金National Key Research and Development Program of China(2023YFB3207800)National Natural Science Foundation of China(61927804)。
文摘On-chip couplers are essential for coupling free-space electromagnetic waves into sub-wavelength semiconductor devices and enhancing light-matter interactions.However,the couplers used in existing single field-effect transistor(FET)detectors exhibit poor response over wide frequency ranges,making the detection of ultra-wideband weak signals highly challenging.In this work,we introduce a meta-array coupler for terahertz detectors based on field-effect transistors,which demonstrates exceptional coupling asymmetry beneath the gate.To optimize the meta-array structure for high gain across an ultra-wide frequency range,we propose a hybrid long short-term memory–multi-layer perceptron(LSTM-MLP)neural network for the detector’s on-chip coupler.This method enables accurate and rapid prediction of the enhanced spectra of meta-atoms,facilitating efficient conversion from structural parameters to resonance frequencies.Compared to traditional dipole couplers,the proposed metacoupler generates strong localized electric field enhancement through dipole resonance,achieving a mixing factor asymmetry up to 246 times higher near 660 GHz and an antenna factor enhancement of approximately 50 times.The meta-array coupled FET terahertz detector achieves ultra-wideband resonance enhancement from 350 to1000 GHz.This hardware architecture and hybrid LSTM-MLP neural network are expected to overcome the limitations of current FET-based detectors in coupling efficiency,bridging the performance gap toward ultra-sensitive detection applications.
基金Linyi City’s 2021 Science and Technology Innovation Development Plan(Medical Category)(No.202120069).
文摘Background:Pulmonary artery systolic pressure(PASP)has often been evaluated as an indicator of heart failure,but the relationship between PASP and the prognosis of elderly patients with acute myocardial infarction(AMI)is not well understood.Methods:The medical data of 3460 hospitalized elderly patients diagnosed with AMI between January 2013 and June 2018 were reviewed.PASP was calculated usingtransthoracic color Doppler ultrasonography.Patients were grouped accordingtotheir admission PASP results as follows:Group A,PASP≤30 mmHg;Group B,30 mmHg<PASP≤50 mmHg;and Group C,PASP≥51 mmHg.The primary endpoint was all-cause death 6 months following AMI.Multiple Cox regression analysis was used to identify independent risk factors for 6-month mortality in elderly patients with AMI.Results:PASP was associated with age,Killip classification,AMI site,and decreased ejection fraction in elderly patients.After adjusting for clinical and echocardiographic parameters in the Cox model,PASP was found to be significantly related to all-cause mortality.In receiver operating characteristic analysis,a PASP of>34 mmHg had a sensitivity of 62.3%and specificity of 65.7%for predicting 6-month all-cause death after AMI.Conclusion:PASP at admission is a useful marker for predicting short-term mortality in elderly patients with AMI.This finding could be used to help identify high-risk patients and make appropriate clinical decisions.
