Trace of Pb(Ⅱ) has been on-line separated and enriched from environmental samples and wastewater by using the self-made alizarin violet functionalized silica gel micro-column coupling with a sequential injection samp...Trace of Pb(Ⅱ) has been on-line separated and enriched from environmental samples and wastewater by using the self-made alizarin violet functionalized silica gel micro-column coupling with a sequential injection sampling technology. The determination is based on the color reaction of Pb(Ⅱ) with iodide and crystal violet to form an ionic association complex in the presence of polyvinyl alcohol and hydrochloric acid. The use of the microcolumn can prevent the interference of most familiar metal ions, and therefore improve the selectivity and sensitivity of this analytical technique. The proposed method was used for the determination of Pb(Ⅱ) in environmental samples and wastewater. No statistically significant difference was observed between the results determined by the present method and atomic absorption spectrometry.展开更多
目的对比基于精准吻合器和刘氏吻合三步法的改良PPS术与传统PPS术治疗超低位直肠癌的临床疗效。方法前瞻性收集自2019年6月至2021年5月行超低位直肠癌精准功能保肛术(PPS术)的患者数据,根据手术方式分为传统PPS组(传统组)和基于精准吻...目的对比基于精准吻合器和刘氏吻合三步法的改良PPS术与传统PPS术治疗超低位直肠癌的临床疗效。方法前瞻性收集自2019年6月至2021年5月行超低位直肠癌精准功能保肛术(PPS术)的患者数据,根据手术方式分为传统PPS组(传统组)和基于精准吻合器和刘氏吻合三步法的改良PPS术(改良组),并对比两组患者的临床资料(包括基线情况、病理学情况、围手术期恢复指标等)。结果共纳入135例患者资料,其中传统组110例,改良组25例。两组患者基线水平和病理学情况差异均无统计学意义,术中出血(127 mL vs.125 mL)、手术时间(207 min vs.219 min)、远切缘距离(1.2 cm vs.1.3 cm)、术后住院时间(13.5 d vs.12.4 d)、手术费用(64661.3 RMB vs.62096.8 RMB)等差异均无统计学意义。改良PPS术显著降低预防性造口比例(37.3%vs.12%,P=0.015)、总体并发症发生率(32.7%vs.12.0%,P=0.039)和吻合口漏发生率(22.7%vs.0%,P=0.008)。结论基于精准吻合器和刘氏吻合三步法的改良PPS术显著降低预防性造口比例和吻合口漏风险,具有广阔的前景和良好的社会经济效益。展开更多
Under a large signal drive level,a frequency domain black box model of the nonlinear scattering function is introduced into power FETs and diodes.A time domain measurement system and a calibration method based on a di...Under a large signal drive level,a frequency domain black box model of the nonlinear scattering function is introduced into power FETs and diodes.A time domain measurement system and a calibration method based on a digital oscilloscope are designed to extract the nonlinear scattering function of semiconductor devices.The extracted models can reflect the real electrical performance of semiconductor devices and propose a new large-signal model to the design of microwave semiconductor circuits.展开更多
基金supported by the Science and Technology Department of Henan Province (082300423202 & 102300410194)
文摘Trace of Pb(Ⅱ) has been on-line separated and enriched from environmental samples and wastewater by using the self-made alizarin violet functionalized silica gel micro-column coupling with a sequential injection sampling technology. The determination is based on the color reaction of Pb(Ⅱ) with iodide and crystal violet to form an ionic association complex in the presence of polyvinyl alcohol and hydrochloric acid. The use of the microcolumn can prevent the interference of most familiar metal ions, and therefore improve the selectivity and sensitivity of this analytical technique. The proposed method was used for the determination of Pb(Ⅱ) in environmental samples and wastewater. No statistically significant difference was observed between the results determined by the present method and atomic absorption spectrometry.
文摘目的对比基于精准吻合器和刘氏吻合三步法的改良PPS术与传统PPS术治疗超低位直肠癌的临床疗效。方法前瞻性收集自2019年6月至2021年5月行超低位直肠癌精准功能保肛术(PPS术)的患者数据,根据手术方式分为传统PPS组(传统组)和基于精准吻合器和刘氏吻合三步法的改良PPS术(改良组),并对比两组患者的临床资料(包括基线情况、病理学情况、围手术期恢复指标等)。结果共纳入135例患者资料,其中传统组110例,改良组25例。两组患者基线水平和病理学情况差异均无统计学意义,术中出血(127 mL vs.125 mL)、手术时间(207 min vs.219 min)、远切缘距离(1.2 cm vs.1.3 cm)、术后住院时间(13.5 d vs.12.4 d)、手术费用(64661.3 RMB vs.62096.8 RMB)等差异均无统计学意义。改良PPS术显著降低预防性造口比例(37.3%vs.12%,P=0.015)、总体并发症发生率(32.7%vs.12.0%,P=0.039)和吻合口漏发生率(22.7%vs.0%,P=0.008)。结论基于精准吻合器和刘氏吻合三步法的改良PPS术显著降低预防性造口比例和吻合口漏风险,具有广阔的前景和良好的社会经济效益。
基金supported by the Basic Research Item of the National Key Laboratory of Electronic Measurement Technology (No.6134903)
文摘Under a large signal drive level,a frequency domain black box model of the nonlinear scattering function is introduced into power FETs and diodes.A time domain measurement system and a calibration method based on a digital oscilloscope are designed to extract the nonlinear scattering function of semiconductor devices.The extracted models can reflect the real electrical performance of semiconductor devices and propose a new large-signal model to the design of microwave semiconductor circuits.
