Laboratory-scale experiments were carried out to evaluate the influences of operational parameters on the melt crystallization efficiency for p-cresol purification.The optimal crystallization conditions were determine...Laboratory-scale experiments were carried out to evaluate the influences of operational parameters on the melt crystallization efficiency for p-cresol purification.The optimal crystallization conditions were determined:dynamic pulsed aeration at 90 L·h-1 and the cooling rate of 0.6-0.8 ℃·min-1,followed by sweating at 0.2-0.3 ℃·min-1 for 40 min.Results also demonstrate that the melt crystallization efficiency is sensitive to feed concentration,which highlights this technology for separation and purification of high purity products.展开更多
Objective To determine the extent to which differences in generic quality of life （QOL） between transcatheter aortic valve implanta- tion （TAVI） and surgical aortic valve replacement （AVR） patients explained by ...Objective To determine the extent to which differences in generic quality of life （QOL） between transcatheter aortic valve implanta- tion （TAVI） and surgical aortic valve replacement （AVR） patients explained by EuroSCORE and heart-team operability assessment. Methods A total of 146 high-risk patients with EuroSCORE 〉 6 and aged 〉 75 years underwent TAVI （n = 80） or aortic valve replacement （n = 66） between February 2010 and July 2013. A total of 75 patients also completed preoperative and six month SF-12 QOL measures. Analyses examined incident major morbidity, compared six month QOL between groups adjusted for EUroSCORE and operability, and quantified rates of clinically significant QOL improvement and deterioration. Results The AVR group required longer ventilation （〉 24 h） （TAVI 5.0% vs. AVR 20.6%, P = 0.004） and more units of red blood cells [TAVI 0 （0-1） vs. AVR 2 （0-3）, P = 0.01]. New renal failure was higher in TAVI （TAVI 5.0% vs. AVR 0%, P = 0.06）. TAVI patients reported significantly lower vitality （P = 0.01） by comparison to AVR patients, however these findings were no longer significant after adjustment for operability. In both procedures, clinically significant QOL improvement was common [range 25.0% （general health） - 62.9% （physical role）] whereas deterioration in QOL occurred less frequently [range 9.3% （physical role） - 33.3% （mental health）]. Conclusions Clinically significant improvement and deterioration in QOL was evident at six months in high risk elderly aortic valve replacement patients. Overall QOL did not differ between TAVI and AVR once operability was taken into consideration.展开更多
Thanks for the good comment by Matsubara et al.（2017） on our case of＂Antepartum hemorrhage fromprevious-cesarean-sectioned uterus as a potential signof uterine artery pseudoaneurysm＂ （Zhang et al., 2017）,publish...Thanks for the good comment by Matsubara et al.（2017） on our case of＂Antepartum hemorrhage fromprevious-cesarean-sectioned uterus as a potential signof uterine artery pseudoaneurysm＂ （Zhang et al., 2017）,published in the Journal of Zhejiang University-SCIENCE B （Biomedicine ＆ Biotechnology）.展开更多
Uterine artery pseudoaneurysm （UAP）, an im-portant disorder causing postpartum hemorrhage, hasbeen considered to occur after ＂traumatic delivery＂such as cesarean section （CS）. Our recent study （Babaet al., 2016...Uterine artery pseudoaneurysm （UAP）, an im-portant disorder causing postpartum hemorrhage, hasbeen considered to occur after ＂traumatic delivery＂such as cesarean section （CS）. Our recent study （Babaet al., 2016） confirmed that UAP can also occur after＂non-traumatic＂ delivery.展开更多
Pressure fluctuation at the vaneless space and vanes passages is one of the most important problems for the stable operation of a pump turbine. The fluctuation appears in any operating condition. Much research has bee...Pressure fluctuation at the vaneless space and vanes passages is one of the most important problems for the stable operation of a pump turbine. The fluctuation appears in any operating condition. Much research has been done on the pressure fluctuation of hydraulic machinery. However, the details of pressure fluctuation propagation of the pump turbine at the pump mode have not been revealed. The modem pump turbine with high water head requires the runner to be ＂flat＂, which would induce pressure fluctuation more easily than the low head pump turbine. In this article, a high head pump turbine model is used as the re- search object. As the pressure fluctuation at off-design point is more serious than at the design point, the low head condition is chosen as the research condition. Pressure fluctuation at the vaneless space and vanes passages is predicted by the computa- tional fluid dynamics method based on k-co shear stress transport model. The experiment conducted on the test rig of the Har- bin Institute of Large Electrical Machinery is used to verify the simulation method. It proves that the numerical method is a feasible way to research the fluctuation under this operating condition. The pressure fluctuation along the passage direction is analyzed at time and frequency domains. It is affected mainly by the interaction between the runner and vanes. In the circumferential direction, the influence of the special stay vane on the pressure fluctuation is got. The amplitude in the high-pressure side passage of that vane is lower than that in the other side. The study provides a basic understanding of the pressure fluctua- tion of a pump turbine and could be used as a reference to improve the operation stability of it.展开更多
基金Supported by the National Basic Research Program of China (2009CB219905)Program for Changjiang Scholars and Innovative Research Team in University (IRT0936)Innovating Fund of Tianjin University
文摘Laboratory-scale experiments were carried out to evaluate the influences of operational parameters on the melt crystallization efficiency for p-cresol purification.The optimal crystallization conditions were determined:dynamic pulsed aeration at 90 L·h-1 and the cooling rate of 0.6-0.8 ℃·min-1,followed by sweating at 0.2-0.3 ℃·min-1 for 40 min.Results also demonstrate that the melt crystallization efficiency is sensitive to feed concentration,which highlights this technology for separation and purification of high purity products.
文摘Objective To determine the extent to which differences in generic quality of life （QOL） between transcatheter aortic valve implanta- tion （TAVI） and surgical aortic valve replacement （AVR） patients explained by EuroSCORE and heart-team operability assessment. Methods A total of 146 high-risk patients with EuroSCORE 〉 6 and aged 〉 75 years underwent TAVI （n = 80） or aortic valve replacement （n = 66） between February 2010 and July 2013. A total of 75 patients also completed preoperative and six month SF-12 QOL measures. Analyses examined incident major morbidity, compared six month QOL between groups adjusted for EUroSCORE and operability, and quantified rates of clinically significant QOL improvement and deterioration. Results The AVR group required longer ventilation （〉 24 h） （TAVI 5.0% vs. AVR 20.6%, P = 0.004） and more units of red blood cells [TAVI 0 （0-1） vs. AVR 2 （0-3）, P = 0.01]. New renal failure was higher in TAVI （TAVI 5.0% vs. AVR 0%, P = 0.06）. TAVI patients reported significantly lower vitality （P = 0.01） by comparison to AVR patients, however these findings were no longer significant after adjustment for operability. In both procedures, clinically significant QOL improvement was common [range 25.0% （general health） - 62.9% （physical role）] whereas deterioration in QOL occurred less frequently [range 9.3% （physical role） - 33.3% （mental health）]. Conclusions Clinically significant improvement and deterioration in QOL was evident at six months in high risk elderly aortic valve replacement patients. Overall QOL did not differ between TAVI and AVR once operability was taken into consideration.
文摘Thanks for the good comment by Matsubara et al.（2017） on our case of＂Antepartum hemorrhage fromprevious-cesarean-sectioned uterus as a potential signof uterine artery pseudoaneurysm＂ （Zhang et al., 2017）,published in the Journal of Zhejiang University-SCIENCE B （Biomedicine ＆ Biotechnology）.
文摘Uterine artery pseudoaneurysm （UAP）, an im-portant disorder causing postpartum hemorrhage, hasbeen considered to occur after ＂traumatic delivery＂such as cesarean section （CS）. Our recent study （Babaet al., 2016） confirmed that UAP can also occur after＂non-traumatic＂ delivery.
基金supported by the National Natural Science Foundation of China(Grant No.51176168)the National Key Technology Research and Development Program(Grant No.2011BAF03B01)
文摘Pressure fluctuation at the vaneless space and vanes passages is one of the most important problems for the stable operation of a pump turbine. The fluctuation appears in any operating condition. Much research has been done on the pressure fluctuation of hydraulic machinery. However, the details of pressure fluctuation propagation of the pump turbine at the pump mode have not been revealed. The modem pump turbine with high water head requires the runner to be ＂flat＂, which would induce pressure fluctuation more easily than the low head pump turbine. In this article, a high head pump turbine model is used as the re- search object. As the pressure fluctuation at off-design point is more serious than at the design point, the low head condition is chosen as the research condition. Pressure fluctuation at the vaneless space and vanes passages is predicted by the computa- tional fluid dynamics method based on k-co shear stress transport model. The experiment conducted on the test rig of the Har- bin Institute of Large Electrical Machinery is used to verify the simulation method. It proves that the numerical method is a feasible way to research the fluctuation under this operating condition. The pressure fluctuation along the passage direction is analyzed at time and frequency domains. It is affected mainly by the interaction between the runner and vanes. In the circumferential direction, the influence of the special stay vane on the pressure fluctuation is got. The amplitude in the high-pressure side passage of that vane is lower than that in the other side. The study provides a basic understanding of the pressure fluctua- tion of a pump turbine and could be used as a reference to improve the operation stability of it.
