AIM： To evaluate and compare the intraoperative parameters and postoperative outcomes of torsional mode and longitudinal mode of phacoemulsification. METHODS： Pertinent studies were identified by a computerized MED...AIM： To evaluate and compare the intraoperative parameters and postoperative outcomes of torsional mode and longitudinal mode of phacoemulsification. METHODS： Pertinent studies were identified by a computerized MEDLINE search from January 2002 to September 2013. The Meta-anaiysis is composed of two parts. In the first part the intraoperative parameters were considered： ultrasound time （UST） and cumulative dissipated energy （CDE）. The intraoperative values were also distinctly considered for two categories （moderate and hard cataract group） depending on the nuclear opacity grade. In the second part of the study the postoperative outcomes as the best corrected visual acuity （BCVA） and the endothelial cell loss （ECL） were taken in consideration. RESULTS： The UST and CDE values proved statistically significant in support of torsional mode for both moderate and hard cataract group. The analysis of BCVA did not present statistically significant difference between the two surgical modalities. The ECL count was statistically significant in support of torsional mode （P〈0.001）. CONCLUSION： The Meta -analysis shows the superiority of the torsional mode for intraoperative parameters （UST, CDE） and postoperative ECL outcomes.展开更多
The accurate model is the most important and basic condition for the application of advanced process control, but the conventional methods do not provide satisfactory results in the case of unstable processes. To effe...The accurate model is the most important and basic condition for the application of advanced process control, but the conventional methods do not provide satisfactory results in the case of unstable processes. To effec-tively control these processes, a novel identification method (Model Parameters and Initial States Identification si-multaneously in closed loop —MPISI) is proposed. The model parameters and initial states of state equation can be simultaneously identified using this method. The results of simulation and application show that this method has the advantageous of disturbance-rejection and robustness. This method proposes a novel way for the optimization and the advanced control of the process systems.展开更多
Nowadays short texts can be widely found in various social data in relation to the 5G-enabled Internet of Things (IoT). Short text classification is a challenging task due to its sparsity and the lack of context. Prev...Nowadays short texts can be widely found in various social data in relation to the 5G-enabled Internet of Things (IoT). Short text classification is a challenging task due to its sparsity and the lack of context. Previous studies mainly tackle these problems by enhancing the semantic information or the statistical information individually. However, the improvement achieved by a single type of information is limited, while fusing various information may help to improve the classification accuracy more effectively. To fuse various information for short text classification, this article proposes a feature fusion method that integrates the statistical feature and the comprehensive semantic feature together by using the weighting mechanism and deep learning models. In the proposed method, we apply Bidirectional Encoder Representations from Transformers (BERT) to generate word vectors on the sentence level automatically, and then obtain the statistical feature, the local semantic feature and the overall semantic feature using Term Frequency-Inverse Document Frequency (TF-IDF) weighting approach, Convolutional Neural Network (CNN) and Bidirectional Gate Recurrent Unit (BiGRU). Then, the fusion feature is accordingly obtained for classification. Experiments are conducted on five popular short text classification datasets and a 5G-enabled IoT social dataset and the results show that our proposed method effectively improves the classification performance.展开更多
Rapid formation of autotrophic partial denitrification(APD)granules is of practical interest to start up an expanded granular sludge bed reactor for wastewater treatment.This study demonstrates that methanogenic granu...Rapid formation of autotrophic partial denitrification(APD)granules is of practical interest to start up an expanded granular sludge bed reactor for wastewater treatment.This study demonstrates that methanogenic granules can be easily acclimated into autotrophic partial denitrification granules in one day,with the ability to remove 82%of 2.7 kg-S/(m^3·d)sulfide into S^0 and to convert 97%of 0.9 kg-N/(m^3·d)nitrate into nitrite,which can provide a promising feedstock for anaerobic ammonia oxidation process.Arcobacter sp.is essential for S^0 accumulation.Under high loadings,the abundance of Arcobacter sp.decreased,while on the contrary the abundance of unclassified_p_Firmicutes increased,leading to the deterioration of autotrophic partial denitrification performance.The granules performance could be recovered by adopting the strategies of properly reducing the influent loadings.展开更多
目的探讨髓芯减压联合丹参酮ⅡA混合植骨治疗FicatⅡ期股骨头坏死(osteonecrosis of the femeral head,ONFH)。方法选择2013年2月—2014年2月收治的62例FicatⅡ期ONFH患者为研究对象,采用简单抽样法随机分成A、B两组,各31例。B组仅给予...目的探讨髓芯减压联合丹参酮ⅡA混合植骨治疗FicatⅡ期股骨头坏死(osteonecrosis of the femeral head,ONFH)。方法选择2013年2月—2014年2月收治的62例FicatⅡ期ONFH患者为研究对象,采用简单抽样法随机分成A、B两组,各31例。B组仅给予髓芯减压打压植骨术,A组则采用髓芯减压联合丹参酮ⅡA混合植骨方案。对比两组患者治疗有效率及并发症发生情况,记录髋关节功能(Harris)评分结果及股骨头塌陷情况。计量资料采用t检验,计数资料采用χ2检验,P<0.05为差异有统计学意义。结果治疗后,A组Harris评分为(96.63±3.26)分,优良率达到90.32%,明显高于B组的(90.13±3.27)分和67.74%,差异有统计学意义(P<0.05)。术后A组股骨头塌陷严重程度较低,其优良率达83.87%,明显高于B组的61.29%,差异有统计学意义(P<0.05)。经过术后6个月的随访,发现术后两组患者均无严重并发症发生,为甲级愈合。结论对FicatⅡ期ONFH患者给予髓芯减压联合丹参酮ⅡA混合植骨方案,疗效显著,值得临床推广。展开更多
The surface modification of the anionic polyurethane(APU)film was carried out by immersing it in silk fibroin peptide(SFP)solution for 12 h and then treating with low temperature plasma glow discharge.The physical pro...The surface modification of the anionic polyurethane(APU)film was carried out by immersing it in silk fibroin peptide(SFP)solution for 12 h and then treating with low temperature plasma glow discharge.The physical properties and moisture permeability of modified films were examined.The results showed that SFP-modified APU films had better moisture permeability than oleophilic polyurethane,as well as modified APU films kept good flexibility.Modified APU films could overcome rigid and brittle weaks of silk fibroin films.The morphology of SFP on the APU film was corpuscular aggregations.The water-contact angle measurement indicated that the change of hydrophilicity and the element chemical analysis suggested that the SFP-modified film surface was enriched with nitrogen atoms.The biocompatibility of APU films may be improved due to the change of surface components.Cell viability and proliferation of rat embryo dermal fibroblasts seeded on control films,APU films and SFP-modified APU films were evaluated by MTT assay and viable cell counts,respectively.The results indicated that the APU film modified by SFP protein showed the proliferation of fibroblasts on the film,and that the compound interface had good stability in the air.Results also showed that presoaking treatment for APU films was effective to accomplish the goal of surface modification.展开更多
Objectives To compare the different patterns of coronary artery calcification (CAC) in acute and chronic coronary syndromes utilizing electron beam computed tomography. Background Pathologic, angiographic, and intraco...Objectives To compare the different patterns of coronary artery calcification (CAC) in acute and chronic coronary syndromes utilizing electron beam computed tomography. Background Pathologic, angiographic, and intracoronary ultrasound studies revealed sharp differences in the plaque morphology between patients with acute versus chronic coronary syndromes. Whether there are different patterns of coronary artery calcification in patients with stable angina pectoris (SAP) and in those with unstable angina pectoris (UAP) or acute myocardial infarction (AMI), however, remains unclear. Methods Two hundred and sixty - four patients, including 67 with SAP, 94 with UAP and 103 with AMI were studied with electron beam computed tomography for analysis of coronary artery calcification and with selective coronary angiography for determination of atherosclerotic lesions. CAC prevalence and calcium score were compared among three groups, and relation of CAC to the severity of atherosclerotic disease in the SAP and UAP patients was separately analyzed. Results Prevalence of CAC was 100 % in the SAP patients, significantly higher than the 87. 23 % in UAP patients and 86. 41 % among the patients with AMI ( P < 0. 05) . More patients and arteries in the SAP group had severe forms of calcium than those in the UAP and AMI group ( P < 0. 01), and the mean LN [CS + 1] (natural logarithm transformation of calcium score) of the SAP patients was much greater than that of the UAP and AMI patients (P < 0.001). The distribution of vessels with various CAC by luminal stenosis was different between SAP and UAP patients. The average CAC extent of the infarct - related arteries was less severe than that of the noninfarct - related arteries. Conclusions U-tilizing electron beam computed tomography, we demonstrated that there exist different patterns of coronary artery calcification in patients with acute versus chronic coronary syndromes, which may provide insight into the differences observed in the clinical and pathologic development between these two types of coronary artery disease.展开更多
Droplets of Ag60Sb34Cu6 ternary alloy within the diameter range of 60—800 μm were rapidly solidified by means of drop tube containerless processing, and the solidi- fication mechanism is analyzed. With a decrease in...Droplets of Ag60Sb34Cu6 ternary alloy within the diameter range of 60—800 μm were rapidly solidified by means of drop tube containerless processing, and the solidi- fication mechanism is analyzed. With a decrease in droplet size, the cooling rate increases from 57 to 5.8×104 K/s. The maximum undercooling is determined to be 180 K (0.23TL) and the microstructure of primary ε(Ag3Sb) dendrite refines drastically until homogenous equiaxed dendrite forms. Ex- perimental results indicate that (ε+Ag) pseudobinary eutectic cannot form under high undercooling conditions and the solubility of Ag in primary ε phase increases as undercooling increases. Based on thermal analysis and crystal growth morphology, it is found that this alloy is solidified in two ways corresponding to different undercooling levels.展开更多
文摘AIM： To evaluate and compare the intraoperative parameters and postoperative outcomes of torsional mode and longitudinal mode of phacoemulsification. METHODS： Pertinent studies were identified by a computerized MEDLINE search from January 2002 to September 2013. The Meta-anaiysis is composed of two parts. In the first part the intraoperative parameters were considered： ultrasound time （UST） and cumulative dissipated energy （CDE）. The intraoperative values were also distinctly considered for two categories （moderate and hard cataract group） depending on the nuclear opacity grade. In the second part of the study the postoperative outcomes as the best corrected visual acuity （BCVA） and the endothelial cell loss （ECL） were taken in consideration. RESULTS： The UST and CDE values proved statistically significant in support of torsional mode for both moderate and hard cataract group. The analysis of BCVA did not present statistically significant difference between the two surgical modalities. The ECL count was statistically significant in support of torsional mode （P〈0.001）. CONCLUSION： The Meta -analysis shows the superiority of the torsional mode for intraoperative parameters （UST, CDE） and postoperative ECL outcomes.
基金Supported by the Common Project Plan of Beijing Municipal Education Commission (No.100100435).
文摘The accurate model is the most important and basic condition for the application of advanced process control, but the conventional methods do not provide satisfactory results in the case of unstable processes. To effec-tively control these processes, a novel identification method (Model Parameters and Initial States Identification si-multaneously in closed loop —MPISI) is proposed. The model parameters and initial states of state equation can be simultaneously identified using this method. The results of simulation and application show that this method has the advantageous of disturbance-rejection and robustness. This method proposes a novel way for the optimization and the advanced control of the process systems.
基金supported in part by the Beijing Natural Science Foundation under grants M21032 and 19L2029in part by the National Natural Science Foundation of China under grants U1836106 and 81961138010in part by the Scientific and Technological Innovation Foundation of Foshan under grants BK21BF001 and BK20BF010.
文摘Nowadays short texts can be widely found in various social data in relation to the 5G-enabled Internet of Things (IoT). Short text classification is a challenging task due to its sparsity and the lack of context. Previous studies mainly tackle these problems by enhancing the semantic information or the statistical information individually. However, the improvement achieved by a single type of information is limited, while fusing various information may help to improve the classification accuracy more effectively. To fuse various information for short text classification, this article proposes a feature fusion method that integrates the statistical feature and the comprehensive semantic feature together by using the weighting mechanism and deep learning models. In the proposed method, we apply Bidirectional Encoder Representations from Transformers (BERT) to generate word vectors on the sentence level automatically, and then obtain the statistical feature, the local semantic feature and the overall semantic feature using Term Frequency-Inverse Document Frequency (TF-IDF) weighting approach, Convolutional Neural Network (CNN) and Bidirectional Gate Recurrent Unit (BiGRU). Then, the fusion feature is accordingly obtained for classification. Experiments are conducted on five popular short text classification datasets and a 5G-enabled IoT social dataset and the results show that our proposed method effectively improves the classification performance.
基金supported by the National Natural Science Foundation of China (21307160)the Natural Science Foundation of Shandong Province, China (ZR20192019MEE038)+3 种基金the Fundamental Research Funds for the Central Universities (19CX02038A)the Open Project of Key Laboratory of Environmental Biotechnology, CAS (Grant No. kf2018003)the Open Project Program of State Key Laboratory of Petroleum Pollution Control (Grant No. PPC2018006)the CNPC Research Institute of Safety and Environmental Technology
文摘Rapid formation of autotrophic partial denitrification(APD)granules is of practical interest to start up an expanded granular sludge bed reactor for wastewater treatment.This study demonstrates that methanogenic granules can be easily acclimated into autotrophic partial denitrification granules in one day,with the ability to remove 82%of 2.7 kg-S/(m^3·d)sulfide into S^0 and to convert 97%of 0.9 kg-N/(m^3·d)nitrate into nitrite,which can provide a promising feedstock for anaerobic ammonia oxidation process.Arcobacter sp.is essential for S^0 accumulation.Under high loadings,the abundance of Arcobacter sp.decreased,while on the contrary the abundance of unclassified_p_Firmicutes increased,leading to the deterioration of autotrophic partial denitrification performance.The granules performance could be recovered by adopting the strategies of properly reducing the influent loadings.
文摘目的探讨髓芯减压联合丹参酮ⅡA混合植骨治疗FicatⅡ期股骨头坏死(osteonecrosis of the femeral head,ONFH)。方法选择2013年2月—2014年2月收治的62例FicatⅡ期ONFH患者为研究对象,采用简单抽样法随机分成A、B两组,各31例。B组仅给予髓芯减压打压植骨术,A组则采用髓芯减压联合丹参酮ⅡA混合植骨方案。对比两组患者治疗有效率及并发症发生情况,记录髋关节功能(Harris)评分结果及股骨头塌陷情况。计量资料采用t检验,计数资料采用χ2检验,P<0.05为差异有统计学意义。结果治疗后,A组Harris评分为(96.63±3.26)分,优良率达到90.32%,明显高于B组的(90.13±3.27)分和67.74%,差异有统计学意义(P<0.05)。术后A组股骨头塌陷严重程度较低,其优良率达83.87%,明显高于B组的61.29%,差异有统计学意义(P<0.05)。经过术后6个月的随访,发现术后两组患者均无严重并发症发生,为甲级愈合。结论对FicatⅡ期ONFH患者给予髓芯减压联合丹参酮ⅡA混合植骨方案,疗效显著,值得临床推广。
基金Supported by the National Basic Research 973 Programof China(No.2005CB623906)
文摘The surface modification of the anionic polyurethane(APU)film was carried out by immersing it in silk fibroin peptide(SFP)solution for 12 h and then treating with low temperature plasma glow discharge.The physical properties and moisture permeability of modified films were examined.The results showed that SFP-modified APU films had better moisture permeability than oleophilic polyurethane,as well as modified APU films kept good flexibility.Modified APU films could overcome rigid and brittle weaks of silk fibroin films.The morphology of SFP on the APU film was corpuscular aggregations.The water-contact angle measurement indicated that the change of hydrophilicity and the element chemical analysis suggested that the SFP-modified film surface was enriched with nitrogen atoms.The biocompatibility of APU films may be improved due to the change of surface components.Cell viability and proliferation of rat embryo dermal fibroblasts seeded on control films,APU films and SFP-modified APU films were evaluated by MTT assay and viable cell counts,respectively.The results indicated that the APU film modified by SFP protein showed the proliferation of fibroblasts on the film,and that the compound interface had good stability in the air.Results also showed that presoaking treatment for APU films was effective to accomplish the goal of surface modification.
文摘Objectives To compare the different patterns of coronary artery calcification (CAC) in acute and chronic coronary syndromes utilizing electron beam computed tomography. Background Pathologic, angiographic, and intracoronary ultrasound studies revealed sharp differences in the plaque morphology between patients with acute versus chronic coronary syndromes. Whether there are different patterns of coronary artery calcification in patients with stable angina pectoris (SAP) and in those with unstable angina pectoris (UAP) or acute myocardial infarction (AMI), however, remains unclear. Methods Two hundred and sixty - four patients, including 67 with SAP, 94 with UAP and 103 with AMI were studied with electron beam computed tomography for analysis of coronary artery calcification and with selective coronary angiography for determination of atherosclerotic lesions. CAC prevalence and calcium score were compared among three groups, and relation of CAC to the severity of atherosclerotic disease in the SAP and UAP patients was separately analyzed. Results Prevalence of CAC was 100 % in the SAP patients, significantly higher than the 87. 23 % in UAP patients and 86. 41 % among the patients with AMI ( P < 0. 05) . More patients and arteries in the SAP group had severe forms of calcium than those in the UAP and AMI group ( P < 0. 01), and the mean LN [CS + 1] (natural logarithm transformation of calcium score) of the SAP patients was much greater than that of the UAP and AMI patients (P < 0.001). The distribution of vessels with various CAC by luminal stenosis was different between SAP and UAP patients. The average CAC extent of the infarct - related arteries was less severe than that of the noninfarct - related arteries. Conclusions U-tilizing electron beam computed tomography, we demonstrated that there exist different patterns of coronary artery calcification in patients with acute versus chronic coronary syndromes, which may provide insight into the differences observed in the clinical and pathologic development between these two types of coronary artery disease.
文摘Droplets of Ag60Sb34Cu6 ternary alloy within the diameter range of 60—800 μm were rapidly solidified by means of drop tube containerless processing, and the solidi- fication mechanism is analyzed. With a decrease in droplet size, the cooling rate increases from 57 to 5.8×104 K/s. The maximum undercooling is determined to be 180 K (0.23TL) and the microstructure of primary ε(Ag3Sb) dendrite refines drastically until homogenous equiaxed dendrite forms. Ex- perimental results indicate that (ε+Ag) pseudobinary eutectic cannot form under high undercooling conditions and the solubility of Ag in primary ε phase increases as undercooling increases. Based on thermal analysis and crystal growth morphology, it is found that this alloy is solidified in two ways corresponding to different undercooling levels.
