The effects of operation parameters of combined blowing converter on the volumetric mass transfer coefficient between slag and steel are studied with a cold model with water simulating steel, oil simulating slag and b...The effects of operation parameters of combined blowing converter on the volumetric mass transfer coefficient between slag and steel are studied with a cold model with water simulating steel, oil simulating slag and benzoic acid as the transferred substance between water and oil. The results show that, with lance level of 2.1m and the top blowing rate of 25000Nm3/h, the volumetric mass transfer coefficient changes most significantly when the bottom blowing rate ranges from 384 to 540Nm3/h. The volumetric mass transfer coefficient reaches its maximum when the lance level is 2.1m, the top blowing rates is 30000Nm3/h, and the bottom blowing rate is 384Nm3/h with tuyeres located symmetrically at 0.66D of the converter bottom.展开更多
The classification of the Northeast China Cold Vortex(NCCV)activity paths is an important way to analyze its characteristics in detail.Based on the daily precipitation data of the northeastern China(NEC)region,and the...The classification of the Northeast China Cold Vortex(NCCV)activity paths is an important way to analyze its characteristics in detail.Based on the daily precipitation data of the northeastern China(NEC)region,and the atmospheric circulation field and temperature field data of ERA-Interim for every six hours,the NCCV processes during the early summer(June)seasons from 1979 to 2018 were objectively identified.Then,the NCCV processes were classified using a machine learning method(k-means)according to the characteristic parameters of the activity path information.The rationality of the classification results was verified from two aspects,as follows:(1)the atmospheric circulation configuration of the NCCV on various paths;and(2)its influences on the climate conditions in the NEC.The obtained results showed that the activity paths of the NCCV could be divided into four types according to such characteristics as the generation origin,movement direction,and movement velocity of the NCCV.These included the generation-eastward movement type in the east of the Mongolia Plateau(eastward movement type or type A);generation-southeast longdistance movement type in the upstream of the Lena River(southeast long-distance movement type or type B);generationeastward less-movement type near Lake Baikal(eastward less-movement type or type C);and the generation-southward less-movement type in eastern Siberia(southward less-movement type or type D).There were obvious differences observed in the atmospheric circulation configuration and the climate impact of the NCCV on the four above-mentioned types of paths,which indicated that the classification results were reasonable.展开更多
The seesawing of economic and political relations between China and Japan seems likely for the long haul International relations experts have made no secret of the fact that frosty political relations between China an...The seesawing of economic and political relations between China and Japan seems likely for the long haul International relations experts have made no secret of the fact that frosty political relations between China and Japan have begun to have an effect on their economic ties. Many even declare that economic cooperation has already started to展开更多
夏秋更替之际,笔者突患感冒,症状或重或轻,数日不愈。日前,在网上看到一篇题为 Blowing Your Nose Could Make Colds Worse的文章,细读之下,又以自身较之,顿觉茅塞大开。佳文不敢独享,特介绍给广大《科技英语学习》的读者。 原来,感冒...夏秋更替之际,笔者突患感冒,症状或重或轻,数日不愈。日前,在网上看到一篇题为 Blowing Your Nose Could Make Colds Worse的文章,细读之下,又以自身较之,顿觉茅塞大开。佳文不敢独享,特介绍给广大《科技英语学习》的读者。 原来,感冒时擤鼻涕(blow your nose)会导致 sinus infections,从而加重感冒程度。但令人意外的是,Coughing and sneezing does not propel mucus back intothe sinuses。对此新发现,专家们又以科学实验佐之,十分令人信服。 但这一来,读者可能会问,感冒擤鼻涕往往是“不得己”的,自己又怎能控制呢?当然,文章也未忘记对此作一交待。展开更多
通过对新抚钢40 t LD-钢包吹氩-CC-高速线材轧制的φ10mm 45钢冷镦裂纹的分析,得出钢中Al_2O_3、MnS夹杂和片状珠光体组织是冷镦裂纹产生的主要原因。通过采用降低炉料中的硫含量使[S]从0.029%降至0.020%,控制LD终点[C]和降低终点[O],...通过对新抚钢40 t LD-钢包吹氩-CC-高速线材轧制的φ10mm 45钢冷镦裂纹的分析,得出钢中Al_2O_3、MnS夹杂和片状珠光体组织是冷镦裂纹产生的主要原因。通过采用降低炉料中的硫含量使[S]从0.029%降至0.020%,控制LD终点[C]和降低终点[O],轧材经球化退火后钢的伸长率从21.6%提高到30.4%等措施,避免了冷镦裂纹的发生。展开更多
文摘The effects of operation parameters of combined blowing converter on the volumetric mass transfer coefficient between slag and steel are studied with a cold model with water simulating steel, oil simulating slag and benzoic acid as the transferred substance between water and oil. The results show that, with lance level of 2.1m and the top blowing rate of 25000Nm3/h, the volumetric mass transfer coefficient changes most significantly when the bottom blowing rate ranges from 384 to 540Nm3/h. The volumetric mass transfer coefficient reaches its maximum when the lance level is 2.1m, the top blowing rates is 30000Nm3/h, and the bottom blowing rate is 384Nm3/h with tuyeres located symmetrically at 0.66D of the converter bottom.
基金This research was jointly supported by the National Natural Science Foundation of China(Grant No.42005037)the Liaoning Provincial Natural Science Foundation Project(PhD Start-up Research Fund 2019-BS-214),the Special Scientific Research Project for the Forecaster(Grant No.CMAYBY2018-018)+2 种基金a Key Technical Project of Liaoning Meteorological Bureau(Grant No.LNGJ201903)the National Key Research and Development Project(Grant No.2018YFC1505601)the Open Foundation Project of the Institute of Atmospheric Environment,China Meteorological Administration(Grant Nos.2020SYIAE08 and 2020SYIAEZD5).
文摘The classification of the Northeast China Cold Vortex(NCCV)activity paths is an important way to analyze its characteristics in detail.Based on the daily precipitation data of the northeastern China(NEC)region,and the atmospheric circulation field and temperature field data of ERA-Interim for every six hours,the NCCV processes during the early summer(June)seasons from 1979 to 2018 were objectively identified.Then,the NCCV processes were classified using a machine learning method(k-means)according to the characteristic parameters of the activity path information.The rationality of the classification results was verified from two aspects,as follows:(1)the atmospheric circulation configuration of the NCCV on various paths;and(2)its influences on the climate conditions in the NEC.The obtained results showed that the activity paths of the NCCV could be divided into four types according to such characteristics as the generation origin,movement direction,and movement velocity of the NCCV.These included the generation-eastward movement type in the east of the Mongolia Plateau(eastward movement type or type A);generation-southeast longdistance movement type in the upstream of the Lena River(southeast long-distance movement type or type B);generationeastward less-movement type near Lake Baikal(eastward less-movement type or type C);and the generation-southward less-movement type in eastern Siberia(southward less-movement type or type D).There were obvious differences observed in the atmospheric circulation configuration and the climate impact of the NCCV on the four above-mentioned types of paths,which indicated that the classification results were reasonable.
文摘The seesawing of economic and political relations between China and Japan seems likely for the long haul International relations experts have made no secret of the fact that frosty political relations between China and Japan have begun to have an effect on their economic ties. Many even declare that economic cooperation has already started to
文摘夏秋更替之际,笔者突患感冒,症状或重或轻,数日不愈。日前,在网上看到一篇题为 Blowing Your Nose Could Make Colds Worse的文章,细读之下,又以自身较之,顿觉茅塞大开。佳文不敢独享,特介绍给广大《科技英语学习》的读者。 原来,感冒时擤鼻涕(blow your nose)会导致 sinus infections,从而加重感冒程度。但令人意外的是,Coughing and sneezing does not propel mucus back intothe sinuses。对此新发现,专家们又以科学实验佐之,十分令人信服。 但这一来,读者可能会问,感冒擤鼻涕往往是“不得己”的,自己又怎能控制呢?当然,文章也未忘记对此作一交待。
文摘通过对新抚钢40 t LD-钢包吹氩-CC-高速线材轧制的φ10mm 45钢冷镦裂纹的分析,得出钢中Al_2O_3、MnS夹杂和片状珠光体组织是冷镦裂纹产生的主要原因。通过采用降低炉料中的硫含量使[S]从0.029%降至0.020%,控制LD终点[C]和降低终点[O],轧材经球化退火后钢的伸长率从21.6%提高到30.4%等措施,避免了冷镦裂纹的发生。
