Background:Double blind-ending ureter(DBU)is an extremely rare congenital anomaly involving a duplicated ureter with no connection to the renal pelvis or bladder,making diagnosis difficult.Case Description:A 10-year-o...Background:Double blind-ending ureter(DBU)is an extremely rare congenital anomaly involving a duplicated ureter with no connection to the renal pelvis or bladder,making diagnosis difficult.Case Description:A 10-year-old girl presented with recurrent abdominal pain and ultrasound evidence of left hydroureteronephrosis.Magnetic resonance imaging(MRI)and three-dimensional(3D)reconstruction revealed a 30 cm blind-ending ureter.Robotic-assisted excision(Da Vinci Xi)was performed safely,preserving adjacent structures.Histology confirmed a nonfunctional ureteral remnant.Conclusions:DBU is a rare duplication variant.Advanced imaging and robotic surgery are essential for accurate diagnosis and effective,minimally invasive treatment.展开更多
本文考察了CO2体积分数、温度、气体流量、吸收液喷雾量、DBU体积分数等因素对CO2吸收量的影响.研究结果表明:各因素对CO2吸收量的影响大小顺序为CO2体积分数>温度>气体流量>吸收液喷雾量>DBU体积分数,DBU醇溶液喷雾吸收CO...本文考察了CO2体积分数、温度、气体流量、吸收液喷雾量、DBU体积分数等因素对CO2吸收量的影响.研究结果表明:各因素对CO2吸收量的影响大小顺序为CO2体积分数>温度>气体流量>吸收液喷雾量>DBU体积分数,DBU醇溶液喷雾吸收CO2的最佳条件是CO2体积分数15%、温度30℃、气体流量2.7 L·min-1、吸收液喷雾量30 m L·min-1、DBU体积分数5%,此时CO2吸收量为1.095 mol·mol-1.展开更多
Molecular precursors phthalimidomethyl phthalic acid and phthalimidomethyl phthalonitrile were synthesized for the first time and both were able to condensation to form tetra phthalimidomethyl phthalocyanine zinc thro...Molecular precursors phthalimidomethyl phthalic acid and phthalimidomethyl phthalonitrile were synthesized for the first time and both were able to condensation to form tetra phthalimidomethyl phthalocyanine zinc through “ammomium molybdate method” and “DBU method ”respectively. The precursors and title compounds were characterized by element analysis, IR, UV/Vis as well as NMR. The two synthesis methods were compared, the result indicated that using the phthalimidomethyl phthalic acid as precursor through the former method, the product was an isomer with C4h symmetry, while using phthalimidomethyl phthalonitrile as precursor through the latter method, the products were a mixture of different isomers.展开更多
在自制的1,8-二氮杂双环[5,4,0]十一碳-7-烯(DBU)吸收CO_(2)的填料塔中,研究DBU溶液浓度、入口CO_(2)浓度、DBU溶液流量、气体流量、气体温度以及填料层高度对CO_(2)吸收的影响。结果表明,DBU溶液浓度从1.5%增加到25%,CO_(2)吸收容量和...在自制的1,8-二氮杂双环[5,4,0]十一碳-7-烯(DBU)吸收CO_(2)的填料塔中,研究DBU溶液浓度、入口CO_(2)浓度、DBU溶液流量、气体流量、气体温度以及填料层高度对CO_(2)吸收的影响。结果表明,DBU溶液浓度从1.5%增加到25%,CO_(2)吸收容量和吸收效率均逐步减小;入口CO_(2)浓度从4.5%增加到15%,CO_(2)吸收容量和吸收效率均逐渐增大;DBU溶液流量从20 m L/min增加到120 m L/min,CO_(2)吸收容量和吸收效率略有增加;气体流量从0.7 L/min增加到3.3 L/min,填料层高度从5 cm增加到45 cm,CO_(2)吸收容量和吸收效率均呈先增后减趋势;气体温度从25℃增加到60℃,CO_(2)吸收容量和吸收效率略有下降。DBU溶液在填料塔内能够高效吸收气体中的CO_(2)。展开更多
文摘Background:Double blind-ending ureter(DBU)is an extremely rare congenital anomaly involving a duplicated ureter with no connection to the renal pelvis or bladder,making diagnosis difficult.Case Description:A 10-year-old girl presented with recurrent abdominal pain and ultrasound evidence of left hydroureteronephrosis.Magnetic resonance imaging(MRI)and three-dimensional(3D)reconstruction revealed a 30 cm blind-ending ureter.Robotic-assisted excision(Da Vinci Xi)was performed safely,preserving adjacent structures.Histology confirmed a nonfunctional ureteral remnant.Conclusions:DBU is a rare duplication variant.Advanced imaging and robotic surgery are essential for accurate diagnosis and effective,minimally invasive treatment.
文摘本文考察了CO2体积分数、温度、气体流量、吸收液喷雾量、DBU体积分数等因素对CO2吸收量的影响.研究结果表明:各因素对CO2吸收量的影响大小顺序为CO2体积分数>温度>气体流量>吸收液喷雾量>DBU体积分数,DBU醇溶液喷雾吸收CO2的最佳条件是CO2体积分数15%、温度30℃、气体流量2.7 L·min-1、吸收液喷雾量30 m L·min-1、DBU体积分数5%,此时CO2吸收量为1.095 mol·mol-1.
文摘Molecular precursors phthalimidomethyl phthalic acid and phthalimidomethyl phthalonitrile were synthesized for the first time and both were able to condensation to form tetra phthalimidomethyl phthalocyanine zinc through “ammomium molybdate method” and “DBU method ”respectively. The precursors and title compounds were characterized by element analysis, IR, UV/Vis as well as NMR. The two synthesis methods were compared, the result indicated that using the phthalimidomethyl phthalic acid as precursor through the former method, the product was an isomer with C4h symmetry, while using phthalimidomethyl phthalonitrile as precursor through the latter method, the products were a mixture of different isomers.
文摘在自制的1,8-二氮杂双环[5,4,0]十一碳-7-烯(DBU)吸收CO_(2)的填料塔中,研究DBU溶液浓度、入口CO_(2)浓度、DBU溶液流量、气体流量、气体温度以及填料层高度对CO_(2)吸收的影响。结果表明,DBU溶液浓度从1.5%增加到25%,CO_(2)吸收容量和吸收效率均逐步减小;入口CO_(2)浓度从4.5%增加到15%,CO_(2)吸收容量和吸收效率均逐渐增大;DBU溶液流量从20 m L/min增加到120 m L/min,CO_(2)吸收容量和吸收效率略有增加;气体流量从0.7 L/min增加到3.3 L/min,填料层高度从5 cm增加到45 cm,CO_(2)吸收容量和吸收效率均呈先增后减趋势;气体温度从25℃增加到60℃,CO_(2)吸收容量和吸收效率略有下降。DBU溶液在填料塔内能够高效吸收气体中的CO_(2)。
