A new intercalation-type anode material is reported herein to improve the lithium storage kinetics for high-rate lithium ion capacitors.The crystal structure of orthorhombic NaNbO3 indicates two possible tunnels for l...A new intercalation-type anode material is reported herein to improve the lithium storage kinetics for high-rate lithium ion capacitors.The crystal structure of orthorhombic NaNbO3 indicates two possible tunnels for lithium ions insertion into NaNbO3 host along the<101>and<141>directions.Moreover,in situ XRD is conducted to investigate the lithium storage mechanism and structural evolution of the NaNb O_(3) anode,demonstrating its intercalation behavior through(101)and(141)planes.Furthermore,the rGO nanosheets are introduced to facilitate the charge transfer,which also effectively prevent the aggregation of NaNbO3 nanocubes.As expected,the NaNbO_(3)/rGO nanocomposites possess remarkable reversible capacity(465 mA h g^(-1) at 0.1 A g^(-1)),superior rate capability(325 mA h g^(-1) at 1.0 A g^(-1))and cycling stability,attributed to their synergistic effect and high Li+diffusion coefficient DLi[D(NaNbO_(3)/rGO)/D(NaNbO_(3))≈31.54].Remarkably,the NaNbO3/rGO-based LIC delivers a high energy density of 166.7 W h kg^(-1) at 112.4 W kg^(-1) and remains 24.1 W h kg^(-1) at an ultrahigh power density of26621.2 W kg^(-1),with an outstanding cycling durability(90%retention over 3000 cycles at 1.0 A g^(-1)).This study provides new insights on novel intercalation-type anode material to enrich the materials system of LICs.展开更多
Taking Hongyan strawberry as the material and PE drip irrigation tape and fertilizer applicator as the tool of integrated application of water and fertilizer,this experiment studied the effects of six fertilizers incl...Taking Hongyan strawberry as the material and PE drip irrigation tape and fertilizer applicator as the tool of integrated application of water and fertilizer,this experiment studied the effects of six fertilizers including Batian,Jiashili,Wangdefeng,Stanley,volfertile and calcium protein on yield and quality of strawberry. The experimental results showed that different water-soluble fertilizers had different effects on the main economic traits of strawberry. For the maximum single fruit mass,the highest was volfertile treatment( 28. 72 g),followed by calcium protein treatment,and the lowest was Stanley treatment( 23. 89 g). The fruit treated with Batian,volfertile and calcium protein was hard in the texture,the fruit treated with Wangdefeng was harder,that of Stanley was softer,and that of Jiashili was soft. The strawberry fruit treated with Wangdefeng and calcium protein was sweet,the fruit treated with volfertile and Batian was sweet,that treated with Jiashili was sour and sweet,and that treated with Stanley was slightly sour. The fruit treated with calcium protein,volfertile and Batian showed strong storage resistance.Strawberry plants treated with Batian,Wangdefeng,Stanley,and calcium protein showed stronger growth,and strawberry plants showed a semi-opening pattern. The yield of strawberry treated with volfertile was highest( 17 400 kg/ha),which was significantly increased compared with other treatments,followed by that treated by Stanley( 13 140 kg/ha).展开更多
目的自主研发MRI设备性能检测虚拟仿真教学系统,解决MRI设备实验教学不易开展的难题。方法针对滨州医学院2016级四年制医学影像技术专业、五年制医学影像学专业共202名学生,根据《医学影像设备学》中MRI设备教学要求,基于Unity3D引擎,应...目的自主研发MRI设备性能检测虚拟仿真教学系统,解决MRI设备实验教学不易开展的难题。方法针对滨州医学院2016级四年制医学影像技术专业、五年制医学影像学专业共202名学生,根据《医学影像设备学》中MRI设备教学要求,基于Unity3D引擎,应用Unity3D、3D Studio Max、Maya、Visual Studio技术,构建3D实验仿真模型、实验场景,设计实验学习内容、考核评价内容,研制教学系统软件,基于Web在线学习。并对实验学习进行满意度调查,统计本教学系统在国家虚拟仿真实验教学平台上学习者实验成绩数据,多维度评价学习效果。结果构建的虚拟仿真教学系统为综合性实验,12个知识点对应12个实验项目,共计81个互动内容与步骤。本校学生实验学习满意度调查(202人)整体满意率为96.82%(2347/2424)。在国家虚拟仿真实验教学平台参与本教学系统学习并提交实验报告的499人中,实验成绩平均分为78.07分(线上学习考核满分90分),整体通过率为96.79%(483/499),实验成绩获90分(18人)的平均学习时间为54 min。结论本虚拟仿真教学系统,实验内容全面系统、实验场景真实度高、实验操作互动性强,学习效果良好,具有推广价值。展开更多
The unique crystal structure and multiple redox couples of iron titanate(Fe_(2)TiO_(5)) provide it a high theoretical capacity and good cycling stability when used as an electrode. In this study, the electrospinning m...The unique crystal structure and multiple redox couples of iron titanate(Fe_(2)TiO_(5)) provide it a high theoretical capacity and good cycling stability when used as an electrode. In this study, the electrospinning method is employed to synthesize one-dimensional(1 D) Fe_(2)TiO_(5) nanochains. The as-prepared Fe_(2)TiO_(5) nanochains exhibited superior specific capacity(500 mAh·g^(-1) at 0.10 A·g^(-1)),excellent rate performance(180 mAh·g^(-1) at 5.00 A·g^(-1)),and good cycling stability(retaining 100% of the initial specific capacity at a current density of 1.00 A·g^(-1) after1000 cycles). The as-assembled Fe_(2)TiO_(5)/SCCB lithiumion capacitor(LIC) also delivered a competitive energy density(137.8 Wh·kg^(-1))andpowerdensity(11,250 W·kg^(-1)). This study proves that the as-fabricated1 D Fe_(2)TiO_(5) nanochains are promising anode materials for high-performance LICs.展开更多
基金supported by the Natural Science Foundation of Jiangsu Province(No.BK20170549)the National Natural Science Foundation of China(No.21706103)Postdoctoral Science Foundation of Jiangsu Province(No.2019K295)。
文摘A new intercalation-type anode material is reported herein to improve the lithium storage kinetics for high-rate lithium ion capacitors.The crystal structure of orthorhombic NaNbO3 indicates two possible tunnels for lithium ions insertion into NaNbO3 host along the<101>and<141>directions.Moreover,in situ XRD is conducted to investigate the lithium storage mechanism and structural evolution of the NaNb O_(3) anode,demonstrating its intercalation behavior through(101)and(141)planes.Furthermore,the rGO nanosheets are introduced to facilitate the charge transfer,which also effectively prevent the aggregation of NaNbO3 nanocubes.As expected,the NaNbO_(3)/rGO nanocomposites possess remarkable reversible capacity(465 mA h g^(-1) at 0.1 A g^(-1)),superior rate capability(325 mA h g^(-1) at 1.0 A g^(-1))and cycling stability,attributed to their synergistic effect and high Li+diffusion coefficient DLi[D(NaNbO_(3)/rGO)/D(NaNbO_(3))≈31.54].Remarkably,the NaNbO3/rGO-based LIC delivers a high energy density of 166.7 W h kg^(-1) at 112.4 W kg^(-1) and remains 24.1 W h kg^(-1) at an ultrahigh power density of26621.2 W kg^(-1),with an outstanding cycling durability(90%retention over 3000 cycles at 1.0 A g^(-1)).This study provides new insights on novel intercalation-type anode material to enrich the materials system of LICs.
基金Supported by Project for Experimental Demonstration of New Agricultural Technology of Ministry of Agriculture and Rural Affairs(Integrated Application of Water and Fertilizer for Drip Irrigation under Ground Membrane)Project for Provincial-level Farmland Quality Improvement and Fertilizer Reduction and Efficiency Increase
文摘Taking Hongyan strawberry as the material and PE drip irrigation tape and fertilizer applicator as the tool of integrated application of water and fertilizer,this experiment studied the effects of six fertilizers including Batian,Jiashili,Wangdefeng,Stanley,volfertile and calcium protein on yield and quality of strawberry. The experimental results showed that different water-soluble fertilizers had different effects on the main economic traits of strawberry. For the maximum single fruit mass,the highest was volfertile treatment( 28. 72 g),followed by calcium protein treatment,and the lowest was Stanley treatment( 23. 89 g). The fruit treated with Batian,volfertile and calcium protein was hard in the texture,the fruit treated with Wangdefeng was harder,that of Stanley was softer,and that of Jiashili was soft. The strawberry fruit treated with Wangdefeng and calcium protein was sweet,the fruit treated with volfertile and Batian was sweet,that treated with Jiashili was sour and sweet,and that treated with Stanley was slightly sour. The fruit treated with calcium protein,volfertile and Batian showed strong storage resistance.Strawberry plants treated with Batian,Wangdefeng,Stanley,and calcium protein showed stronger growth,and strawberry plants showed a semi-opening pattern. The yield of strawberry treated with volfertile was highest( 17 400 kg/ha),which was significantly increased compared with other treatments,followed by that treated by Stanley( 13 140 kg/ha).
文摘目的自主研发MRI设备性能检测虚拟仿真教学系统,解决MRI设备实验教学不易开展的难题。方法针对滨州医学院2016级四年制医学影像技术专业、五年制医学影像学专业共202名学生,根据《医学影像设备学》中MRI设备教学要求,基于Unity3D引擎,应用Unity3D、3D Studio Max、Maya、Visual Studio技术,构建3D实验仿真模型、实验场景,设计实验学习内容、考核评价内容,研制教学系统软件,基于Web在线学习。并对实验学习进行满意度调查,统计本教学系统在国家虚拟仿真实验教学平台上学习者实验成绩数据,多维度评价学习效果。结果构建的虚拟仿真教学系统为综合性实验,12个知识点对应12个实验项目,共计81个互动内容与步骤。本校学生实验学习满意度调查(202人)整体满意率为96.82%(2347/2424)。在国家虚拟仿真实验教学平台参与本教学系统学习并提交实验报告的499人中,实验成绩平均分为78.07分(线上学习考核满分90分),整体通过率为96.79%(483/499),实验成绩获90分(18人)的平均学习时间为54 min。结论本虚拟仿真教学系统,实验内容全面系统、实验场景真实度高、实验操作互动性强,学习效果良好,具有推广价值。
基金financially supported by the Natural Science Foundation of Jiangsu Province(No.BK20170549)the National Natural Science Foundation of China(No.21706103)+1 种基金the China Postdoctoral Science Foundation(No.2019T120393)the Postdoctoral Science Foundation of Jiangsu Province(No.2019K295)。
文摘The unique crystal structure and multiple redox couples of iron titanate(Fe_(2)TiO_(5)) provide it a high theoretical capacity and good cycling stability when used as an electrode. In this study, the electrospinning method is employed to synthesize one-dimensional(1 D) Fe_(2)TiO_(5) nanochains. The as-prepared Fe_(2)TiO_(5) nanochains exhibited superior specific capacity(500 mAh·g^(-1) at 0.10 A·g^(-1)),excellent rate performance(180 mAh·g^(-1) at 5.00 A·g^(-1)),and good cycling stability(retaining 100% of the initial specific capacity at a current density of 1.00 A·g^(-1) after1000 cycles). The as-assembled Fe_(2)TiO_(5)/SCCB lithiumion capacitor(LIC) also delivered a competitive energy density(137.8 Wh·kg^(-1))andpowerdensity(11,250 W·kg^(-1)). This study proves that the as-fabricated1 D Fe_(2)TiO_(5) nanochains are promising anode materials for high-performance LICs.
