使用低成本、高安全性的水系电解液使二次锌金属电池(AZMBs)成为大规模储能系统是最有前途的选择.然而,锌金属负极在水系电解液中热力学稳定性较差,严重阻碍了AZMBs的实际应用.在此,我们通过在锌表面涂覆氟化石墨并利用氟化石墨和锌之...使用低成本、高安全性的水系电解液使二次锌金属电池(AZMBs)成为大规模储能系统是最有前途的选择.然而,锌金属负极在水系电解液中热力学稳定性较差,严重阻碍了AZMBs的实际应用.在此,我们通过在锌表面涂覆氟化石墨并利用氟化石墨和锌之间原位的界面反应开发了一种富氟的杂化人工固体电解质界面来解决上述问题.疏水的氟化石墨可以有效地限制电解液和电极之间的接触,从而显著提高锌负极的抗腐蚀能力.同时,由氟化石墨和锌原位反应生成的ZnF_(2)共同组成的富氟杂化界面可以促进Zn2+的脱溶剂化作用,并均匀化锌离子通量,从而有效地抑制了副反应发生和枝晶生长.因此,在苛刻的测试条件下(10 mA cm^(−2),1 mA h cm^(−2)和30 mA cm^(−2),10 mA h cm^(−2)),对称电池可以分别稳定地循环1400和200小时以上,远远超过了裸锌的性能.此外,使用载量为6 mg cm^(−2)的MnO_(2)正极组装的Zn/MnO_(2)全电池在1 A g^(−1)的条件下经过2000次循环,仍能保持80%以上的容量.本文提出的这种构建富氟杂化ASEI的方法可以为设计高性能AZMBs提供一种有效的潜在策略.展开更多
In most areas of China, affected by the environment of low temperature and high humidity, the wind speed sensor and wind direction sensor are frozen and cannot output data in autumn, winter or the alternation of winte...In most areas of China, affected by the environment of low temperature and high humidity, the wind speed sensor and wind direction sensor are frozen and cannot output data in autumn, winter or the alternation of winter and spring. In order to solve the freezing situation of the wind sensor, this paper designs a new type of antifreeze wind speed sensor. After meteorology performance testing and field observation tests, the correlation coefficient of the observation data is demonstrated, and the data curve is fitted. The result shows the sensor is stable, and has a good antifreeze effect, the data output is reliable.展开更多
One of the main reasons behind reduced cane yield is pathetic method of planting. Planting method and row spacing are the most important yield contributing factors in sugarcane. A field experiment was carried out in o...One of the main reasons behind reduced cane yield is pathetic method of planting. Planting method and row spacing are the most important yield contributing factors in sugarcane. A field experiment was carried out in order to determine quality and yield of sugarcane in various spatial arrangements. Treatments are 180 cm spaced trenches with triple row strips;180 cm spaced trenches with alternate row strips;120 cm spaced trenches with double row strips and 60 cm spaced furrow with single row. Perusal of data revealed that 3.6%, 13.4%, 15%, 15.3% more cane diameter (cm), cane length (cm), stripped cane yield (t·haˉ1</sup>), sugar yield (t·haˉ1</sup>) were obtained from 180 cm spaced trenches with triple row strips as compared to conventional planting method i.e. 60 cm spaced furrows. While the number of millable canes mˉ2</sup>, polarity %, cane juice purity %, cane juice %, commercial cane sugar % and cane sugar recovery % remained non-significant by different planting techniques.展开更多
The meteorological measurement automatic temperature testing system has a defective image. To solve the problem such as noise and insufficient contrast, and put forward the research program for image pretreatment, the...The meteorological measurement automatic temperature testing system has a defective image. To solve the problem such as noise and insufficient contrast, and put forward the research program for image pretreatment, the median filter, histogram equalization and image binarization, methods were used to remove noise and enhance images. Results showed that feature points were clear and accurate after the experiment. This simulation experiment prepared for the follow-up subsequent recognition process.展开更多
To develop the dynamic monitoring algorithm of visual safety distance in highway, by using the highway video traffic monitoring system, the research platform of four kinds of terrain environment in plateau, mountainou...To develop the dynamic monitoring algorithm of visual safety distance in highway, by using the highway video traffic monitoring system, the research platform of four kinds of terrain environment in plateau, mountainous area, plain and coastal area is established. Results show that through the contrast between the sample data and visibility train of thought, based on the theory of mathematical morphology, expressway visibility dynamic monitoring image information system can be established. Based on the theory of the measurement of the basic formula of visibility, the dynamic model of the optimization is established, set up 200 meters distance visual observation target system, research visual range detection algorithm process.展开更多
采用热重分析法研究城市污泥、稻壳水热炭及两者不同掺混比的燃烧特性与反应动力学。对比分析其在不同升温速率下从室温升至1000℃的燃烧特性,用Flynn-Wall-Ozawa (FWO)法计算其燃烧过程中的反应动力学参数。结果表明,稻壳水热炭的挥发...采用热重分析法研究城市污泥、稻壳水热炭及两者不同掺混比的燃烧特性与反应动力学。对比分析其在不同升温速率下从室温升至1000℃的燃烧特性,用Flynn-Wall-Ozawa (FWO)法计算其燃烧过程中的反应动力学参数。结果表明,稻壳水热炭的挥发性、着火和燃尽指数均高于城市污泥,具有较好的燃烧特性,掺混稻壳水热炭使城市污泥混合燃烧时发生热滞后现象。随着稻壳水热炭掺混比的增加,共混物的燃烧残余质量减少,着火性能变差,燃烧性能变强。活化能的相关系数均高于0.95,稻壳水热炭掺混高于50wt%时,共混物的平均活化能低于稻壳水热炭单独燃烧的平均活化能,掺混70wt%稻壳水热炭时出现最低平均活化能,为85.48 k J/mol。城市污泥与稻壳水热炭混燃时有协同交互作用,且掺混50wt%稻壳水热炭时效果最佳。展开更多
基金financially supported by the National Natural Science Foundation of China(22075048 and 52201201)Shaanxi Yanchang Petroleum Co.,Ltd.(18529)+2 种基金Yiwu Research Institute of Fudan University(20-1-06)Shanghai International Collaboration Research Project(19520713900)the State Key Lab of Advanced Metals and Materials(2022Z-11).
文摘使用低成本、高安全性的水系电解液使二次锌金属电池(AZMBs)成为大规模储能系统是最有前途的选择.然而,锌金属负极在水系电解液中热力学稳定性较差,严重阻碍了AZMBs的实际应用.在此,我们通过在锌表面涂覆氟化石墨并利用氟化石墨和锌之间原位的界面反应开发了一种富氟的杂化人工固体电解质界面来解决上述问题.疏水的氟化石墨可以有效地限制电解液和电极之间的接触,从而显著提高锌负极的抗腐蚀能力.同时,由氟化石墨和锌原位反应生成的ZnF_(2)共同组成的富氟杂化界面可以促进Zn2+的脱溶剂化作用,并均匀化锌离子通量,从而有效地抑制了副反应发生和枝晶生长.因此,在苛刻的测试条件下(10 mA cm^(−2),1 mA h cm^(−2)和30 mA cm^(−2),10 mA h cm^(−2)),对称电池可以分别稳定地循环1400和200小时以上,远远超过了裸锌的性能.此外,使用载量为6 mg cm^(−2)的MnO_(2)正极组装的Zn/MnO_(2)全电池在1 A g^(−1)的条件下经过2000次循环,仍能保持80%以上的容量.本文提出的这种构建富氟杂化ASEI的方法可以为设计高性能AZMBs提供一种有效的潜在策略.
文摘In most areas of China, affected by the environment of low temperature and high humidity, the wind speed sensor and wind direction sensor are frozen and cannot output data in autumn, winter or the alternation of winter and spring. In order to solve the freezing situation of the wind sensor, this paper designs a new type of antifreeze wind speed sensor. After meteorology performance testing and field observation tests, the correlation coefficient of the observation data is demonstrated, and the data curve is fitted. The result shows the sensor is stable, and has a good antifreeze effect, the data output is reliable.
文摘One of the main reasons behind reduced cane yield is pathetic method of planting. Planting method and row spacing are the most important yield contributing factors in sugarcane. A field experiment was carried out in order to determine quality and yield of sugarcane in various spatial arrangements. Treatments are 180 cm spaced trenches with triple row strips;180 cm spaced trenches with alternate row strips;120 cm spaced trenches with double row strips and 60 cm spaced furrow with single row. Perusal of data revealed that 3.6%, 13.4%, 15%, 15.3% more cane diameter (cm), cane length (cm), stripped cane yield (t·haˉ1</sup>), sugar yield (t·haˉ1</sup>) were obtained from 180 cm spaced trenches with triple row strips as compared to conventional planting method i.e. 60 cm spaced furrows. While the number of millable canes mˉ2</sup>, polarity %, cane juice purity %, cane juice %, commercial cane sugar % and cane sugar recovery % remained non-significant by different planting techniques.
文摘The meteorological measurement automatic temperature testing system has a defective image. To solve the problem such as noise and insufficient contrast, and put forward the research program for image pretreatment, the median filter, histogram equalization and image binarization, methods were used to remove noise and enhance images. Results showed that feature points were clear and accurate after the experiment. This simulation experiment prepared for the follow-up subsequent recognition process.
文摘To develop the dynamic monitoring algorithm of visual safety distance in highway, by using the highway video traffic monitoring system, the research platform of four kinds of terrain environment in plateau, mountainous area, plain and coastal area is established. Results show that through the contrast between the sample data and visibility train of thought, based on the theory of mathematical morphology, expressway visibility dynamic monitoring image information system can be established. Based on the theory of the measurement of the basic formula of visibility, the dynamic model of the optimization is established, set up 200 meters distance visual observation target system, research visual range detection algorithm process.
文摘采用热重分析法研究城市污泥、稻壳水热炭及两者不同掺混比的燃烧特性与反应动力学。对比分析其在不同升温速率下从室温升至1000℃的燃烧特性,用Flynn-Wall-Ozawa (FWO)法计算其燃烧过程中的反应动力学参数。结果表明,稻壳水热炭的挥发性、着火和燃尽指数均高于城市污泥,具有较好的燃烧特性,掺混稻壳水热炭使城市污泥混合燃烧时发生热滞后现象。随着稻壳水热炭掺混比的增加,共混物的燃烧残余质量减少,着火性能变差,燃烧性能变强。活化能的相关系数均高于0.95,稻壳水热炭掺混高于50wt%时,共混物的平均活化能低于稻壳水热炭单独燃烧的平均活化能,掺混70wt%稻壳水热炭时出现最低平均活化能,为85.48 k J/mol。城市污泥与稻壳水热炭混燃时有协同交互作用,且掺混50wt%稻壳水热炭时效果最佳。
基金National Natural Science Foundation of China(51301017,51571013)Beijing Laboratory of Metallic Materials and Processing for Modern Transportation,ChinaState Key Lab of Advanced Metals and Materials,China(2014Z-09)
