磷酸氢钙反应是制备磷酸盐产品的重要工艺步骤之一。MER值(Magnesium to Extractable Phosphorus Ratio)作为一个衡量磷酸氢钙反应过程中杂质含量的指标,对反应过程的影响引起了广泛的关注。通过研究液相中的反应物扩散过程、杂质产物...磷酸氢钙反应是制备磷酸盐产品的重要工艺步骤之一。MER值(Magnesium to Extractable Phosphorus Ratio)作为一个衡量磷酸氢钙反应过程中杂质含量的指标,对反应过程的影响引起了广泛的关注。通过研究液相中的反应物扩散过程、杂质产物对固体膜和液体膜的影响、磷酸电离与氢离子活度变化的关系以及镁离子对反应速率和能耗的影响,探讨了MER值对磷酸氢钙反应过程的影响机制。实验结果表明,较高的MER值会导致反应物扩散受阻、杂质产物影响反应进行、磷酸电离减弱以及反应速率降低。因此,在工业生产中,需要控制和优化MER值,以提高反应过程的效果和产物的纯度。这些研究结果对于磷酸氢钙反应的工艺改进和优化具有重要的指导意义。展开更多
为了减少对有标记数据的依赖,充分利用大量无标记数据,提出了一个基于数据增强和相似伪标签的半监督文本分类算法(semi-supervised text classification algorithm with data augmentation and similar pseudo-labels, STAP)。该算法利...为了减少对有标记数据的依赖,充分利用大量无标记数据,提出了一个基于数据增强和相似伪标签的半监督文本分类算法(semi-supervised text classification algorithm with data augmentation and similar pseudo-labels, STAP)。该算法利用EPiDA(easy plug-in data augmentation)框架和自训练对少量有标记数据进行扩充,采用一致性训练和相似伪标签考虑无标记数据及其增强样本之间的关系和高置信度的相似无标记数据之间的关系,在有监督交叉熵损失、无监督一致性损失和无监督配对损失的约束下,提高无标记数据的质量。在四个文本分类数据集上进行实验,与其他经典的文本分类算法相比,STAP算法有明显的改进效果。展开更多
Influencing factors to seed dormancy and germination characteristics of Sorbus pohuashanensis were studied. These factors included the morphological development of embryos,the mechanical obstruction of the seed coat,t...Influencing factors to seed dormancy and germination characteristics of Sorbus pohuashanensis were studied. These factors included the morphological development of embryos,the mechanical obstruction of the seed coat,the water and air permeability of seed coat,and the biologic inhibition of extracts from different parts of seed. The results showed that when the seeds of Sorbus pohuashanensis became mature,the morphological development of the embryos was complete. The influencing effect of the mechanical obstruction,the water and permeability of seed coat for seed germination was little; there were inhibited substances to the seed of cabbage germination in seed coat and embryo,the germination depressor could be fat soluble substances. This indicated that the dormant degree was different for the different embryo parts. Cotyledon and hypocotyl was in low degree dormancy,whereas radicle and epicotyl was in high degree dormancy. To some extent,the germination rate of in vitro cultured embryos was increased with detruncating cotyledon and radicle treament. A 1∶3 mixture of seeds and sharp sand at low temperature in favor of removing dormancy. Treated by 200 mg·L -1 6-BA for 24 h,then remained in low temperature (0～5 ℃),seeds could germinated well (the germination rate could reached 31.56% in 3 month treatment). ABA completely inhibited the germination of seed,warm-cold varied temperature treatment did not promote the removing of dormancy of seed.展开更多
文摘磷酸氢钙反应是制备磷酸盐产品的重要工艺步骤之一。MER值(Magnesium to Extractable Phosphorus Ratio)作为一个衡量磷酸氢钙反应过程中杂质含量的指标,对反应过程的影响引起了广泛的关注。通过研究液相中的反应物扩散过程、杂质产物对固体膜和液体膜的影响、磷酸电离与氢离子活度变化的关系以及镁离子对反应速率和能耗的影响,探讨了MER值对磷酸氢钙反应过程的影响机制。实验结果表明,较高的MER值会导致反应物扩散受阻、杂质产物影响反应进行、磷酸电离减弱以及反应速率降低。因此,在工业生产中,需要控制和优化MER值,以提高反应过程的效果和产物的纯度。这些研究结果对于磷酸氢钙反应的工艺改进和优化具有重要的指导意义。
文摘为了减少对有标记数据的依赖,充分利用大量无标记数据,提出了一个基于数据增强和相似伪标签的半监督文本分类算法(semi-supervised text classification algorithm with data augmentation and similar pseudo-labels, STAP)。该算法利用EPiDA(easy plug-in data augmentation)框架和自训练对少量有标记数据进行扩充,采用一致性训练和相似伪标签考虑无标记数据及其增强样本之间的关系和高置信度的相似无标记数据之间的关系,在有监督交叉熵损失、无监督一致性损失和无监督配对损失的约束下,提高无标记数据的质量。在四个文本分类数据集上进行实验,与其他经典的文本分类算法相比,STAP算法有明显的改进效果。
文摘Influencing factors to seed dormancy and germination characteristics of Sorbus pohuashanensis were studied. These factors included the morphological development of embryos,the mechanical obstruction of the seed coat,the water and air permeability of seed coat,and the biologic inhibition of extracts from different parts of seed. The results showed that when the seeds of Sorbus pohuashanensis became mature,the morphological development of the embryos was complete. The influencing effect of the mechanical obstruction,the water and permeability of seed coat for seed germination was little; there were inhibited substances to the seed of cabbage germination in seed coat and embryo,the germination depressor could be fat soluble substances. This indicated that the dormant degree was different for the different embryo parts. Cotyledon and hypocotyl was in low degree dormancy,whereas radicle and epicotyl was in high degree dormancy. To some extent,the germination rate of in vitro cultured embryos was increased with detruncating cotyledon and radicle treament. A 1∶3 mixture of seeds and sharp sand at low temperature in favor of removing dormancy. Treated by 200 mg·L -1 6-BA for 24 h,then remained in low temperature (0～5 ℃),seeds could germinated well (the germination rate could reached 31.56% in 3 month treatment). ABA completely inhibited the germination of seed,warm-cold varied temperature treatment did not promote the removing of dormancy of seed.
