目的:建立一种无损、快速高效的稻谷水分含量检测方法。方法:研究收集了不同年份的稻谷样品161份,运用近红外光谱结合化学计量学方法,通过剔除异常光谱和光谱预处理,采用偏最小二乘法建立稻谷水分含量预测模型。结果:采用主成分分析结...目的:建立一种无损、快速高效的稻谷水分含量检测方法。方法:研究收集了不同年份的稻谷样品161份,运用近红外光谱结合化学计量学方法,通过剔除异常光谱和光谱预处理,采用偏最小二乘法建立稻谷水分含量预测模型。结果:采用主成分分析结合马氏距离的方法剔除异常光谱样品15个,最佳的光谱预处理方式为消除常数偏移量。训练集建立的预测模型(R_(CAL)^(2))为0.9943,模型标准偏差(RMSEC)为0.21%,模型交叉验证决定系数(R_(CV)^(2))为0.9936,模型交叉验证标准偏差(RMSECV)为0.32%,表明预测模型交叉验证预测样品水分含量准确度高。用验证集样品检验预测模型,模型验证集验证决定系数R 2 VA L为0.9801,模型验证集验证标准偏差(RMSEP)值为0.36%,相对分析误差(RPD)值为7.14,表明预测模型对未知样品的预测准确度高。验证集样品实测值与预测值均值方程T检验结果P值(双侧)为0.879,验证集样品实测值与预测值之间差异不显著,表明预测模型的预测结果可信度高,验证集样品预测值与实测值的误差在±1%,且90%以上的验证集样品其预测值与实测值的误差都在±0.5%以内。结论:建立的稻谷水分预测模型可以实现收储稻谷的无损、快速、准确检测。展开更多
In this study, the effects of experimental conditions including the MBR equipped novel device and different operating modes on permeate flux were studied. The results show that the MBR equipped novel device can reduce...In this study, the effects of experimental conditions including the MBR equipped novel device and different operating modes on permeate flux were studied. The results show that the MBR equipped novel device can reduce the resistance and enhance the flux, decreasing the total resistance ( Rt = 9.649) to 5.962 and increasing the permeate flux to 15 - 20 L/m2hr. The permeate flux of intermittent operating mode is more than that of continuous operation and the value of the permeate flux is between 15 l/m2hr and 20 l/m2hr. The MBR equipped novel device which adopting intermittent operating mode is most effective in this study and the value of permeate flux is between 20 l/m2hr and 25 l/m2hr.展开更多
In this study, a three-dimensional ordered macroporous hematite was prepared using the polystyrene colloid crystal templates and characterized by X-ray diffraction, scanning electron microscope, transmission electron ...In this study, a three-dimensional ordered macroporous hematite was prepared using the polystyrene colloid crystal templates and characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, and nitrogen adsorption isotherm. The as-prepared hematite shows a porous structure consisting of the macropores about 200 nm in diameter and the walls about 20 nm in thickness. The adsorption of Pb2+ and Cd2+ ions in aqueous solution by this hematite was also evaluated. At room temperature, each gram hematite adsorbs 12.5 mg of Pb2+ ions and 7.0 mg of Cd2+ ions. The results suggest that the obtained hematite should be a promising adsorbent to remove Pb2+ and Cd2+ ions, and other heavy metal ions from aqueous solution.展开更多
Purpose： RNA helicase p68 plays an important role in organ development and maturation through tuning cell proliferation. However, the character and role of p68 in the whole wound healing process need more study. Meth...Purpose： RNA helicase p68 plays an important role in organ development and maturation through tuning cell proliferation. However, the character and role of p68 in the whole wound healing process need more study. Methods： First, we characterize expression of p68 in normal rat skin development postnatal. Then, we assayed dynamic change of p68 in rat skin from different stage after injury, and explored the role of p68 in proliferation and migration of three types of wound healing related cells. Results： p68 was down-regulated during skin developmental and maturation process, up-regulated after wound, peaked on day 14 and then significantly decreased. Wound fluid enhanced wound healing related cell proliferation and up-regulated expression of p68. Conversely, reducing p68 expression by RNA interference resulted in significantly slower proliferation and migration. Conclusion： Our results define an important role of RNA helicase p68 in skin wound healing process.展开更多
文摘目的:建立一种无损、快速高效的稻谷水分含量检测方法。方法:研究收集了不同年份的稻谷样品161份,运用近红外光谱结合化学计量学方法,通过剔除异常光谱和光谱预处理,采用偏最小二乘法建立稻谷水分含量预测模型。结果:采用主成分分析结合马氏距离的方法剔除异常光谱样品15个,最佳的光谱预处理方式为消除常数偏移量。训练集建立的预测模型(R_(CAL)^(2))为0.9943,模型标准偏差(RMSEC)为0.21%,模型交叉验证决定系数(R_(CV)^(2))为0.9936,模型交叉验证标准偏差(RMSECV)为0.32%,表明预测模型交叉验证预测样品水分含量准确度高。用验证集样品检验预测模型,模型验证集验证决定系数R 2 VA L为0.9801,模型验证集验证标准偏差(RMSEP)值为0.36%,相对分析误差(RPD)值为7.14,表明预测模型对未知样品的预测准确度高。验证集样品实测值与预测值均值方程T检验结果P值(双侧)为0.879,验证集样品实测值与预测值之间差异不显著,表明预测模型的预测结果可信度高,验证集样品预测值与实测值的误差在±1%,且90%以上的验证集样品其预测值与实测值的误差都在±0.5%以内。结论:建立的稻谷水分预测模型可以实现收储稻谷的无损、快速、准确检测。
文摘In this study, the effects of experimental conditions including the MBR equipped novel device and different operating modes on permeate flux were studied. The results show that the MBR equipped novel device can reduce the resistance and enhance the flux, decreasing the total resistance ( Rt = 9.649) to 5.962 and increasing the permeate flux to 15 - 20 L/m2hr. The permeate flux of intermittent operating mode is more than that of continuous operation and the value of the permeate flux is between 15 l/m2hr and 20 l/m2hr. The MBR equipped novel device which adopting intermittent operating mode is most effective in this study and the value of permeate flux is between 20 l/m2hr and 25 l/m2hr.
文摘In this study, a three-dimensional ordered macroporous hematite was prepared using the polystyrene colloid crystal templates and characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, and nitrogen adsorption isotherm. The as-prepared hematite shows a porous structure consisting of the macropores about 200 nm in diameter and the walls about 20 nm in thickness. The adsorption of Pb2+ and Cd2+ ions in aqueous solution by this hematite was also evaluated. At room temperature, each gram hematite adsorbs 12.5 mg of Pb2+ ions and 7.0 mg of Cd2+ ions. The results suggest that the obtained hematite should be a promising adsorbent to remove Pb2+ and Cd2+ ions, and other heavy metal ions from aqueous solution.
基金This work was supported by the Special Funds for Major State Basic Research Program of China （973 Program） （2012CB518103）, Natural Science Foundation Programs （81501090, 81372727, 31300980）, Program of New Century Excellent Talents in University （NCET-11-0869） from Ministry of Education and Innovation team building program of Chongqing university （KJTD201338）.
文摘Purpose： RNA helicase p68 plays an important role in organ development and maturation through tuning cell proliferation. However, the character and role of p68 in the whole wound healing process need more study. Methods： First, we characterize expression of p68 in normal rat skin development postnatal. Then, we assayed dynamic change of p68 in rat skin from different stage after injury, and explored the role of p68 in proliferation and migration of three types of wound healing related cells. Results： p68 was down-regulated during skin developmental and maturation process, up-regulated after wound, peaked on day 14 and then significantly decreased. Wound fluid enhanced wound healing related cell proliferation and up-regulated expression of p68. Conversely, reducing p68 expression by RNA interference resulted in significantly slower proliferation and migration. Conclusion： Our results define an important role of RNA helicase p68 in skin wound healing process.
