Well-channeled porous polyethersulfone（PES） beads were synthesized and used for the immobilization of Comamonas testosteroni QYY cells for an aerobic reactor to remove quinoline, phenol, and other refractory com- po...Well-channeled porous polyethersulfone（PES） beads were synthesized and used for the immobilization of Comamonas testosteroni QYY cells for an aerobic reactor to remove quinoline, phenol, and other refractory com- pounds in accidentally-released dye wastewater supplemented with domestic wastewater. The pore size in PES beads mainly depended on the dripping time through the Water vapor cylinder. When the cylinder was 2.5 m in length, the pore size in the obtained beads was enlarged to 3 ~m, which provided an ideal surface for cells to pass through and grow inside. The reactor with the immobilized C. testosteroni QYY on PES beads resisted organic loading shock and enhanced total organic carbon（TOC） removal, which had 100% removal efficiencies of both quinoline and phenol when the volume ratio of the accidental wastewater to domestic wastewater was increased from 1：2 to 1：1, as compared with the 100% and 34.7% removal efficiencies by the reactor with immobilized C. testosteroni QYY on polyttrethane（PU） cube or the 82% and 2.4% removal efficiencies by the reactor with only the suspended C. testosteroni QYY cells, respectively. The PES beads had a specific surface area of 1843 cm2/cm3, which had immobilized （0.0244-0.003） g of C, testosteroni QYY cell dry mass/cm3, compared with the specific surface area of 564 cm2/cm3 of the PU cube with （0.0184-0.002） g of cell dry mass/cm3. The kinetic study revealed that the quinoline and phenol degradation followed zero-order reactions for all the three reactors. The PES reactor demonstrated the highest quinoline and phenol removal efficiencies. The immobilized C. testosteroni QYY on the low-cost inert PES beads demonstrated good shock resistance and was able to completely remove the toxic compounds, including phenyl carbamate, 2-nitrotoluene, and dioctyl phthalate. Therefore, the beads were ideal for large-scale accidental wastewater treatment.展开更多
Fujian Tulon is a type of rural dwelling in the mountainous areas of Southeast China's Fujian Province.It is known as the Ancient Oriental Castle,and also as the Wrold's Unique Mythical Mountain Architechtural...Fujian Tulon is a type of rural dwelling in the mountainous areas of Southeast China's Fujian Province.It is known as the Ancient Oriental Castle,and also as the Wrold's Unique Mythical Mountain Architechtural Model.Forty-six Fujian Tulou sites were added to the UNESCO(United Nations Educational,Scientific and Cultural Organization)World Heritage Site list in 2008.展开更多
文摘为了在医学图像中提高胰腺计算机断层成像(computed tomography, CT)自动分割的准确率,针对传统分割方法存在受噪声影响大、过分割、欠分割等问题,以及胰腺周围的重要结构组织关系紧密且多变、边缘界限不易确定等特点,提出了一种基于全局特征U-net(U-net with global features, GF U-net)的胰腺图像分割方法。该方法比基于传统深度卷积神经的U-net网络能够提取出更精确的形状、纹理信息,将胰腺图像区域的毛刺边缘进行平滑化,能够更好地把握胰腺的全局特征。通过对82个由美国国立卫生研究院(national institutes of health, NIH)公开的胰腺CT数据进行四折交叉验证,得到Dice相似系数(Dice similariy coefficient, DSC)的均值为87.13%±3.76%,比传统的U-net网络增长了7.43%。提出的方法不仅拥有更高的准确率,而且生成胰腺的形状边缘更加契合生物学上的胰腺形状,更容易应用在临床医学中。
基金Supported by the Major Science and Technology Program for Water Pollution Control and Treatment of China（No. 2014ZX07201-011-004）, the National Natural Science Foundation of China（Nos.51578118, 51378098, 51238001, 51408110, 51508078, 51478095, 51478096）, the Natural Science Foundation of Jilin Province, China（Nos.20150101072JC, 20140520151JH, 20160520023JH）, the Jilm Province Education Department Science and Technology Research Project, China（No.2014B043） and the Program for New Century Excellent Talents in University of the Ministry of Education of China（No.NCET-13-0723）.
文摘Well-channeled porous polyethersulfone（PES） beads were synthesized and used for the immobilization of Comamonas testosteroni QYY cells for an aerobic reactor to remove quinoline, phenol, and other refractory com- pounds in accidentally-released dye wastewater supplemented with domestic wastewater. The pore size in PES beads mainly depended on the dripping time through the Water vapor cylinder. When the cylinder was 2.5 m in length, the pore size in the obtained beads was enlarged to 3 ~m, which provided an ideal surface for cells to pass through and grow inside. The reactor with the immobilized C. testosteroni QYY on PES beads resisted organic loading shock and enhanced total organic carbon（TOC） removal, which had 100% removal efficiencies of both quinoline and phenol when the volume ratio of the accidental wastewater to domestic wastewater was increased from 1：2 to 1：1, as compared with the 100% and 34.7% removal efficiencies by the reactor with immobilized C. testosteroni QYY on polyttrethane（PU） cube or the 82% and 2.4% removal efficiencies by the reactor with only the suspended C. testosteroni QYY cells, respectively. The PES beads had a specific surface area of 1843 cm2/cm3, which had immobilized （0.0244-0.003） g of C, testosteroni QYY cell dry mass/cm3, compared with the specific surface area of 564 cm2/cm3 of the PU cube with （0.0184-0.002） g of cell dry mass/cm3. The kinetic study revealed that the quinoline and phenol degradation followed zero-order reactions for all the three reactors. The PES reactor demonstrated the highest quinoline and phenol removal efficiencies. The immobilized C. testosteroni QYY on the low-cost inert PES beads demonstrated good shock resistance and was able to completely remove the toxic compounds, including phenyl carbamate, 2-nitrotoluene, and dioctyl phthalate. Therefore, the beads were ideal for large-scale accidental wastewater treatment.
文摘Fujian Tulon is a type of rural dwelling in the mountainous areas of Southeast China's Fujian Province.It is known as the Ancient Oriental Castle,and also as the Wrold's Unique Mythical Mountain Architechtural Model.Forty-six Fujian Tulou sites were added to the UNESCO(United Nations Educational,Scientific and Cultural Organization)World Heritage Site list in 2008.
