采用双层硅胶加盖不锈钢材质层压板的层压方法制备功率型低温共烧铁氧体(LTCF)变压器。通过断面显微结构、电感值及耐压的测试,研究了层压方法对其结构及性能的影响。结果表明,相对于传统的层压方法,新方法制作的变压器层压受力均匀、...采用双层硅胶加盖不锈钢材质层压板的层压方法制备功率型低温共烧铁氧体(LTCF)变压器。通过断面显微结构、电感值及耐压的测试,研究了层压方法对其结构及性能的影响。结果表明,相对于传统的层压方法,新方法制作的变压器层压受力均匀、表面不平整度≤±5μm/10 mm,无凸起、分层,排胶烧结过程中未出现开裂、翘曲等缺陷,显微结构理想。变压器性能为,初级电感:≥60μH、次级电感:≥2.6 m H、漏感:≤35μH、耐压:≥1500V(DC),且满足高低温应用环境(-55^+85℃)下磁性能使用可靠性和环境适应性要求。展开更多
Considerable spring precipitation occurs over South China(SC),a region that is adjacent to large-scale Asian topography and oceans.Its reasonable simulation is crucial for improving regional climate predictability.Thi...Considerable spring precipitation occurs over South China(SC),a region that is adjacent to large-scale Asian topography and oceans.Its reasonable simulation is crucial for improving regional climate predictability.This study investigates spring precipitation biases over SC and their possible causes in atmosphere-only and coupled Flexible Global Ocean–Atmosphere–Land System finite-volume version 3(FGOALS-f3)models with different horizontal resolutions.The performance of spring precipitation simulation over SC varies across different FGOALS-f3 model versions,with the best reproducibility in the high-resolution coupled model(25 km).In the low-resolution atmosphere-only model(100–125 km),the precipitation dry bias over SC is closely linked to overestimated surface sensible forcing over the eastern Tibetan Plateau(TP),which weakens the subtropical anticyclone over the western Pacific(SAWP)through regional circulation responses.By contrast,the high-resolution atmosphere-only model further amplifies surface thermal forcing in the Asian continents,causing intensified land–sea thermal contrast between the Southeast Asian continents and western Pacific,enhanced southerly winds and SAWP,and increased water vapor transport into SC.Meanwhile,the reduced middle–high level cold bias over 10°–30°N in the high-resolution atmosphere-only model intensifies the East Asian westerly jet and ascent over SC,leading to enhanced spring precipitation there.The high-resolution coupled model simulation not only reduces sea surface cold bias over the Bay of Bengal,thus intensifying the Indian–Burma trough and strengthening low-level water vapor transport into SC,but also enhances ascent over SC.As a result,the high-resolution coupled model better reproduces the magnitude and pattern of spring precipitation over SC than its atmosphere-only model.Compared with low-resolution models,the domain-mean spring precipitation dry bias decreases by 11.2%over SC in the high-resolution atmosphere-only model and by 35.9%in the coupled model.These results demonstrate that the high-resolution FGOALS-f3 models can improve simulations of the influencing atmospheric circulations and spring precipitation over SC.展开更多
文摘采用双层硅胶加盖不锈钢材质层压板的层压方法制备功率型低温共烧铁氧体(LTCF)变压器。通过断面显微结构、电感值及耐压的测试,研究了层压方法对其结构及性能的影响。结果表明,相对于传统的层压方法,新方法制作的变压器层压受力均匀、表面不平整度≤±5μm/10 mm,无凸起、分层,排胶烧结过程中未出现开裂、翘曲等缺陷,显微结构理想。变压器性能为,初级电感:≥60μH、次级电感:≥2.6 m H、漏感:≤35μH、耐压:≥1500V(DC),且满足高低温应用环境(-55^+85℃)下磁性能使用可靠性和环境适应性要求。
基金Supported by the National Key Research and Development Program of China(2022YFF0802003)National Natural Science Foundation of China(42288101,42275026,and 41975109)+2 种基金Natural Science Foundation of Yunnan Province(202301AV070001)Yunnan University Graduate Research and Innovation Fund(KC-22221894)National Key Scientific and Technological Infrastructure Project of China“Earth System Science Numerical Simulator Facility”(EarthLab)。
文摘Considerable spring precipitation occurs over South China(SC),a region that is adjacent to large-scale Asian topography and oceans.Its reasonable simulation is crucial for improving regional climate predictability.This study investigates spring precipitation biases over SC and their possible causes in atmosphere-only and coupled Flexible Global Ocean–Atmosphere–Land System finite-volume version 3(FGOALS-f3)models with different horizontal resolutions.The performance of spring precipitation simulation over SC varies across different FGOALS-f3 model versions,with the best reproducibility in the high-resolution coupled model(25 km).In the low-resolution atmosphere-only model(100–125 km),the precipitation dry bias over SC is closely linked to overestimated surface sensible forcing over the eastern Tibetan Plateau(TP),which weakens the subtropical anticyclone over the western Pacific(SAWP)through regional circulation responses.By contrast,the high-resolution atmosphere-only model further amplifies surface thermal forcing in the Asian continents,causing intensified land–sea thermal contrast between the Southeast Asian continents and western Pacific,enhanced southerly winds and SAWP,and increased water vapor transport into SC.Meanwhile,the reduced middle–high level cold bias over 10°–30°N in the high-resolution atmosphere-only model intensifies the East Asian westerly jet and ascent over SC,leading to enhanced spring precipitation there.The high-resolution coupled model simulation not only reduces sea surface cold bias over the Bay of Bengal,thus intensifying the Indian–Burma trough and strengthening low-level water vapor transport into SC,but also enhances ascent over SC.As a result,the high-resolution coupled model better reproduces the magnitude and pattern of spring precipitation over SC than its atmosphere-only model.Compared with low-resolution models,the domain-mean spring precipitation dry bias decreases by 11.2%over SC in the high-resolution atmosphere-only model and by 35.9%in the coupled model.These results demonstrate that the high-resolution FGOALS-f3 models can improve simulations of the influencing atmospheric circulations and spring precipitation over SC.
