MnNiGe：Fe ribbon samples are prepared. Partial Ni-and Mn-substitution of Fe element can both induce the antiferromagnetic-ferromagnetic conversion in the Ti Ni Si-type state of these MnNiGe：Fe ribbon systems. It is ...MnNiGe：Fe ribbon samples are prepared. Partial Ni-and Mn-substitution of Fe element can both induce the antiferromagnetic-ferromagnetic conversion in the Ti Ni Si-type state of these MnNiGe：Fe ribbon systems. It is found out, however, that some factors such as annealing, temperature variation process field-cycling, substituted site and magnetic field can affect the conversion and competition between the antiferromagnetic and ferromagnetic states in these ribbons. Therefore, in this paper these major influencing factors are studied systematically and further discussed are the related magnetic and magnetocaloric properties in MnNiGe：Fe ribbon systems.展开更多
By using the ground,high-altitude conventional observation data and NCEP global reanalysis data,the circulation background and the snowfall causes of light rain changing to snowstorm weather process in Panjin during F...By using the ground,high-altitude conventional observation data and NCEP global reanalysis data,the circulation background and the snowfall causes of light rain changing to snowstorm weather process in Panjin during February 12-13 in 2009 were analyzed in detail.Focusing on the rain and snow phase state conversion time,the effects of precipitation phase state transformation time on this precipitation forecast were discussed.The results showed that the circulation adjustment,the eastward shift and down south of polar vortex and the frequent activity of cold air were the main factors which caused the precipitation was obviously more in February in Panjin.The direct reasons which caused the strong snowfall in Panjin were that the warm and cold air evenly matched for a long time,and the southwest jet provided the sufficient water vapor condition.展开更多
A novel method to calculate fuel-electric conversion factor for full hybrid electric vehicle（HEV）equipped with continuously variable transmission（CVT）is proposed.Based on consideration of the efficiency of pivotal...A novel method to calculate fuel-electric conversion factor for full hybrid electric vehicle（HEV）equipped with continuously variable transmission（CVT）is proposed.Based on consideration of the efficiency of pivotal components,electric motor,system efficiency optimization models are developed.According to the target of instantaneous optimization of system efficiency,operating ranges of each mode of power-train are determined,and the corresponding energy management strategies are established.The simulation results demonstrate that the energy management strategy proposed can substantially improve the vehicle fuel economy,and keep battery state of charge（SOC）change in a reasonable variation range.展开更多
Bistable mixed valence compounds have thermodynamically accessible phases at certain temperatures,and the electron transfer switches the electronic configurations by applying external stimuli like heat and light.Therm...Bistable mixed valence compounds have thermodynamically accessible phases at certain temperatures,and the electron transfer switches the electronic configurations by applying external stimuli like heat and light.Thermally induced phase transition temperatures range widely,while the photo-induced state conversions need irradiation at very low temperatures,such as below 30 K,and the photo-induced metastable state relaxes rapidly at low temperatures.We prepared new mixed-valence compounds of[Fe(bipy)(CN)_(4)]_(2)[CoL_(2)](L=4-[(1E)-2-phenyldiazenyl]pyridine for 1-papy and 4-(2-phenylethynyl)pyridine for 1-pepy)in which cyanide-bridged squared cores form corner-shared chains with substantial interchain π-π contacts.Mössbauser spectra revealed that 1-papy and 1-pepy are in the high-spin(HS)state[(Fe_(LS)^(Ⅲ))_(2)Co_(HS)^(Ⅱ)]at 300 K and the low-spin(LS)state[Fe_(LS)^(Ⅱ)Fe_(LS)^(Ⅲ)Co_(LS)^(Ⅲ)]at 78 K,confirming the occurrence of the electron transfer coupled spin transition(ETCST).Magnetic susceptibility measurements suggested their Tc values of 231 and 260 K,respectively.Photoirradiation(808 nm)for 1-papy and 1-pepy at 10 K induced the state conversion from the[LS]to the[HS^(*)]state,and the metastable[HS]^(*)state relaxed to the thermodynamically stable[LS]states at temperatures(Trelax)of 130 and 90 K,respectively.Furthermore,the[LS]states in 1-papy and 1-pepy were fully converted to the[HS^(*)]states by light irradiation at 78 and 50 K,respectively.The X-ray structural analyses showed characteristic coordination bond lengths for the metal ions in each electronic state before and after light irradiation,but shortened intrachain π_(L)⋯π_(L) contact distances,from 3.726(4)to 3.688(4)Å,were observed for 1-papy upon the state conversion from the[LS]to the[HS^(*)]state,despite the swollen cell volumes from 2479 to 2566Å^(3),respectively.Photomagneto and structural studies suggest that the intermolecular interactions increase the light-induced state conversion and relaxation temperatures.展开更多
基金the National Natural Science Foundation of China (Grant Nos. 51261022, 51561023 and 51671097)the Jiangxi Provincial Graduate Student Innovation Special Funds Project (Grant No. YC2015-S310)the Graduate Student Innovation Special Funds Project of Nanchang Hangkong University (Grant No. YC2015007)
文摘MnNiGe：Fe ribbon samples are prepared. Partial Ni-and Mn-substitution of Fe element can both induce the antiferromagnetic-ferromagnetic conversion in the Ti Ni Si-type state of these MnNiGe：Fe ribbon systems. It is found out, however, that some factors such as annealing, temperature variation process field-cycling, substituted site and magnetic field can affect the conversion and competition between the antiferromagnetic and ferromagnetic states in these ribbons. Therefore, in this paper these major influencing factors are studied systematically and further discussed are the related magnetic and magnetocaloric properties in MnNiGe：Fe ribbon systems.
文摘By using the ground,high-altitude conventional observation data and NCEP global reanalysis data,the circulation background and the snowfall causes of light rain changing to snowstorm weather process in Panjin during February 12-13 in 2009 were analyzed in detail.Focusing on the rain and snow phase state conversion time,the effects of precipitation phase state transformation time on this precipitation forecast were discussed.The results showed that the circulation adjustment,the eastward shift and down south of polar vortex and the frequent activity of cold air were the main factors which caused the precipitation was obviously more in February in Panjin.The direct reasons which caused the strong snowfall in Panjin were that the warm and cold air evenly matched for a long time,and the southwest jet provided the sufficient water vapor condition.
基金Supported by the National Science and Technology Support Program(2013BAG12B01)Foundational and Advanced Research Program General Project of Chongqing City(cstc2013jcyjjq60002)
文摘A novel method to calculate fuel-electric conversion factor for full hybrid electric vehicle（HEV）equipped with continuously variable transmission（CVT）is proposed.Based on consideration of the efficiency of pivotal components,electric motor,system efficiency optimization models are developed.According to the target of instantaneous optimization of system efficiency,operating ranges of each mode of power-train are determined,and the corresponding energy management strategies are established.The simulation results demonstrate that the energy management strategy proposed can substantially improve the vehicle fuel economy,and keep battery state of charge（SOC）change in a reasonable variation range.
基金supported by the National Natural Science Foundation of China(Grants,22025101,22222103,22173015,21871039,91961114,22071017,22103009 and 22203013)the Fundamental Research Funds for the Central Universities,China(DUT22LAB606).
文摘Bistable mixed valence compounds have thermodynamically accessible phases at certain temperatures,and the electron transfer switches the electronic configurations by applying external stimuli like heat and light.Thermally induced phase transition temperatures range widely,while the photo-induced state conversions need irradiation at very low temperatures,such as below 30 K,and the photo-induced metastable state relaxes rapidly at low temperatures.We prepared new mixed-valence compounds of[Fe(bipy)(CN)_(4)]_(2)[CoL_(2)](L=4-[(1E)-2-phenyldiazenyl]pyridine for 1-papy and 4-(2-phenylethynyl)pyridine for 1-pepy)in which cyanide-bridged squared cores form corner-shared chains with substantial interchain π-π contacts.Mössbauser spectra revealed that 1-papy and 1-pepy are in the high-spin(HS)state[(Fe_(LS)^(Ⅲ))_(2)Co_(HS)^(Ⅱ)]at 300 K and the low-spin(LS)state[Fe_(LS)^(Ⅱ)Fe_(LS)^(Ⅲ)Co_(LS)^(Ⅲ)]at 78 K,confirming the occurrence of the electron transfer coupled spin transition(ETCST).Magnetic susceptibility measurements suggested their Tc values of 231 and 260 K,respectively.Photoirradiation(808 nm)for 1-papy and 1-pepy at 10 K induced the state conversion from the[LS]to the[HS^(*)]state,and the metastable[HS]^(*)state relaxed to the thermodynamically stable[LS]states at temperatures(Trelax)of 130 and 90 K,respectively.Furthermore,the[LS]states in 1-papy and 1-pepy were fully converted to the[HS^(*)]states by light irradiation at 78 and 50 K,respectively.The X-ray structural analyses showed characteristic coordination bond lengths for the metal ions in each electronic state before and after light irradiation,but shortened intrachain π_(L)⋯π_(L) contact distances,from 3.726(4)to 3.688(4)Å,were observed for 1-papy upon the state conversion from the[LS]to the[HS^(*)]state,despite the swollen cell volumes from 2479 to 2566Å^(3),respectively.Photomagneto and structural studies suggest that the intermolecular interactions increase the light-induced state conversion and relaxation temperatures.
