Aim To develop a hydrodynamic model on the void fraction in liquid slugs for gas liquid slug flow in vertical tubes. Methods Developing the model by considering the gas exchange between the Taylor bubble and the fo...Aim To develop a hydrodynamic model on the void fraction in liquid slugs for gas liquid slug flow in vertical tubes. Methods Developing the model by considering the gas exchange between the Taylor bubble and the following liquid slug. Results Some experimental data are obtained to check the model. In comparison with previous published results, the predictions from this model are better and in good agreement with the experimental data. The error is within ±20%. Conclusion The proposed model can correctly predict the void fraction in liquid slugs for gas liquid two phase slug flow in vertical tubes.展开更多
This article studies rising velocity of Taylor bubbles and liquid slugs in liquid nitrogen at different axial positions in upward inclined tubes by means of a high speed motion analyzer. The bottom-closed tubes in the...This article studies rising velocity of Taylor bubbles and liquid slugs in liquid nitrogen at different axial positions in upward inclined tubes by means of a high speed motion analyzer. The bottom-closed tubes in the experiments are 1.0 m long with an inner diameter of 0.014 m or 0.018 m. The tube inclines upward from 0~ to 50~ with respect to the normal. Statistical method is used to analyze the data of the Taylor bubble and the liquid slug velocity. Reflecting the effects of the inclination angle on the rising velocity of Taylor bubbles and liquid slugs, the experimental results indicate the similar trend the Taylor bubble velocity and the liquid slug velocity have： it increases first, and then decreases with the increase of the inclination angle. Moreover, with the increase of the inclination angle, the liquid slug velocity becomes greater than Taylor bubble velocity.展开更多
目的观察β-catenin/Slug信号特异性抑制剂FH535与EMT的关系,探讨LPCAT1在调节子宫颈癌细胞侵袭、转移和生长中的作用。方法采用sh-NC和sh-LPCAT1转染Hela细胞,利用载体(Vector)组和LPCAT1过表达质粒转染SiHa细胞,将SiHa细胞分为对照组(...目的观察β-catenin/Slug信号特异性抑制剂FH535与EMT的关系,探讨LPCAT1在调节子宫颈癌细胞侵袭、转移和生长中的作用。方法采用sh-NC和sh-LPCAT1转染Hela细胞,利用载体(Vector)组和LPCAT1过表达质粒转染SiHa细胞,将SiHa细胞分为对照组(Con)、LPCAT1组、LPCAT1+FH535组和FH535组。运用CCK-8法和集落形成试验检测子宫颈癌细胞的增殖。通过伤口愈合试验和Transwell实验检测子宫颈癌细胞的转移、侵袭能力。应用Western blot分析细胞中LPCAT1、β-catenin/Slug信号通路和EMT相关蛋白的表达。结果与Vector组相比,LPCAT1组SiHa细胞的活力、集落数、迁移和侵袭细胞数均显著增加(P<0.05);与sh-NC组相比,sh-LPCAT1组Hela细胞的活力、集落数、迁移和侵袭细胞数均显著降低(P<0.05)。与LPCAT1组相比,LPCAT1+FH535组SiHa细胞中Wnt4(1.18±0.05 vs 0.80±0.06)、β-catenin(1.05±0.08 vs 0.77±0.05)、Slug(1.13±0.06 vs 0.28±0.02)、Cyclin D1(0.99±0.06 vs 0.44±0.02)、N-cadherin(0.91±0.07 vs 0.46±0.03)和vimentin(0.95±0.06 vs 0.49±0.03)表达降低(P<0.05),E-cadherin(0.44±0.03 vs 0.58±0.03)表达增加(P<0.05)。此外,与LPCAT1组相比,LPCAT1+FH535组SiHa细胞的集落数(224±15 vs 146±11)、迁移数(85±3 vs 51±4)和侵袭数(166±10 vs 90±5)均降低(P<0.05)。结论LPCAT1表达增加可能通过激活β-catenin/Slug信号通路促进子宫颈癌的转移和进展,LPCAT1的靶向治疗有望提高子宫颈癌患者的预后。展开更多
目的探究E-钙黏蛋白(E-cadherin)、wnt-1诱导分泌蛋白2(wnt-1 inducible secreted protein-2,WISP2)和Slug蛋白与食管胃交界腺癌(adenocarcinoma of the esophagogastric junction,AEG)临床病理因素及预后的关系。方法选取2021年1月至2...目的探究E-钙黏蛋白(E-cadherin)、wnt-1诱导分泌蛋白2(wnt-1 inducible secreted protein-2,WISP2)和Slug蛋白与食管胃交界腺癌(adenocarcinoma of the esophagogastric junction,AEG)临床病理因素及预后的关系。方法选取2021年1月至2022年3月在本院胃肠外科行手术治疗的114例AEG确诊患者,术中留取其癌灶组织与癌旁组织,通过免疫组化染色检测组织中E-cadherin、WISP2、Slug蛋白的表达情况,分析上述指标表达与AEG病理因素的关系,绘制KM曲线探究不同E-cadherin、WISP2、Slug蛋白表达患者的预后情况。结果癌灶组织E-cadherin、WISP2蛋白表达阳性率均低于癌旁组织(P<0.05),但其Slug蛋白表达阳性率高于癌旁组织(P<0.05)。在E-cadherin表达阳性率上,年龄≥50岁患者低于<50岁患者(P<0.05);TNM分期Ⅲ期患者低于Ⅰ~Ⅱ期患者(P<0.05);浸润深度>1/2患者低于≤1/2患者(P<0.05)。在WISP2表达阳性率上,高分化患者低于低、中分化患者(P<0.05);浸润深度>1/2患者低于≤1/2患者(P<0.05)。在Slug蛋白表达阳性率上,高分化高于低、中分化患者(P<0.05);浸润深度>1/2患者高于≤1/2患者(P<0.05);淋巴结转移患者高于无淋巴结转移患者(P<0.05)。Slug蛋白均分别与E-cadherin、WISP2呈负相关(r=-0.301、-0.289,P<0.05)。E-cadherin表达阳性组、阴性组生存时间分别为为(19.71±0.84)个月、(15.85±1.02)个月,阳性组生存时间长于阴性组(P<0.05)。WISP2表达阳性组、阴性组生存时间分别为(19.84±0.83)个月、(18.52±1.82)个月,阳性组生存时间长于阴性组(P<0.05)。Slug表达阳性组、阴性组生存时间分别为为(16.06±0.93)个月、(19.66±0.92)个月,阳性组生存时间短于阴性组(P<0.05)。结论E-cadherin、WISP2、Slug蛋白在AEG患者中异常表达,其表达与AEG的发生、转移以及侵袭等病理因素相关,可作为临床预测AEG患者预后的潜在指标。展开更多
Accurate prediction of the frictional pressure drop is important for the design and operation of subsea oil and gas transporting system considering the length of the pipeline. The applicability of the correlations to ...Accurate prediction of the frictional pressure drop is important for the design and operation of subsea oil and gas transporting system considering the length of the pipeline. The applicability of the correlations to pipeline-riser flow needs evaluation since the flow condition in pipeline-riser is quite different from the original data where they were derived from. In the present study, a comprehensive evaluation of 24prevailing correlation in predicting frictional pressure drop is carried out based on experimentally measured data of air-water and air-oil two-phase flows in pipeline-riser. Experiments are performed in a system having different configuration of pipeline-riser with the inclination of the downcomer varied from-2°to-5°to investigated the effect of the elbow on the frictional pressure drop in the riser. The inlet gas velocity ranges from 0.03 to 6.2 m/s, and liquid velocity varies from 0.02 to 1.3 m/s. A total of885 experimental data points including 782 on air-water flows and 103 on air-oil flows are obtained and used to access the prediction ability of the correlations. Comparison of the predicted results with the measured data indicate that a majority of the investigated correlations under-predict the pressure drop on severe slugging. The result of this study highlights the requirement of new method considering the effect of pipe layout on the frictional pressure drop.展开更多
In 2023, the world economy was generally sluggish, and recovery remained weak. Under the pretext of “derisking,” the United States(US)-led West has generalized economic security and engaged in punitive, exclusive, a...In 2023, the world economy was generally sluggish, and recovery remained weak. Under the pretext of “derisking,” the United States(US)-led West has generalized economic security and engaged in punitive, exclusive, and collectivized economic protectionism. Developing countries are struggling.展开更多
文摘Aim To develop a hydrodynamic model on the void fraction in liquid slugs for gas liquid slug flow in vertical tubes. Methods Developing the model by considering the gas exchange between the Taylor bubble and the following liquid slug. Results Some experimental data are obtained to check the model. In comparison with previous published results, the predictions from this model are better and in good agreement with the experimental data. The error is within ±20%. Conclusion The proposed model can correctly predict the void fraction in liquid slugs for gas liquid two phase slug flow in vertical tubes.
基金National Natural Science Foundation of China (50476015)
文摘This article studies rising velocity of Taylor bubbles and liquid slugs in liquid nitrogen at different axial positions in upward inclined tubes by means of a high speed motion analyzer. The bottom-closed tubes in the experiments are 1.0 m long with an inner diameter of 0.014 m or 0.018 m. The tube inclines upward from 0~ to 50~ with respect to the normal. Statistical method is used to analyze the data of the Taylor bubble and the liquid slug velocity. Reflecting the effects of the inclination angle on the rising velocity of Taylor bubbles and liquid slugs, the experimental results indicate the similar trend the Taylor bubble velocity and the liquid slug velocity have： it increases first, and then decreases with the increase of the inclination angle. Moreover, with the increase of the inclination angle, the liquid slug velocity becomes greater than Taylor bubble velocity.
文摘目的观察β-catenin/Slug信号特异性抑制剂FH535与EMT的关系,探讨LPCAT1在调节子宫颈癌细胞侵袭、转移和生长中的作用。方法采用sh-NC和sh-LPCAT1转染Hela细胞,利用载体(Vector)组和LPCAT1过表达质粒转染SiHa细胞,将SiHa细胞分为对照组(Con)、LPCAT1组、LPCAT1+FH535组和FH535组。运用CCK-8法和集落形成试验检测子宫颈癌细胞的增殖。通过伤口愈合试验和Transwell实验检测子宫颈癌细胞的转移、侵袭能力。应用Western blot分析细胞中LPCAT1、β-catenin/Slug信号通路和EMT相关蛋白的表达。结果与Vector组相比,LPCAT1组SiHa细胞的活力、集落数、迁移和侵袭细胞数均显著增加(P<0.05);与sh-NC组相比,sh-LPCAT1组Hela细胞的活力、集落数、迁移和侵袭细胞数均显著降低(P<0.05)。与LPCAT1组相比,LPCAT1+FH535组SiHa细胞中Wnt4(1.18±0.05 vs 0.80±0.06)、β-catenin(1.05±0.08 vs 0.77±0.05)、Slug(1.13±0.06 vs 0.28±0.02)、Cyclin D1(0.99±0.06 vs 0.44±0.02)、N-cadherin(0.91±0.07 vs 0.46±0.03)和vimentin(0.95±0.06 vs 0.49±0.03)表达降低(P<0.05),E-cadherin(0.44±0.03 vs 0.58±0.03)表达增加(P<0.05)。此外,与LPCAT1组相比,LPCAT1+FH535组SiHa细胞的集落数(224±15 vs 146±11)、迁移数(85±3 vs 51±4)和侵袭数(166±10 vs 90±5)均降低(P<0.05)。结论LPCAT1表达增加可能通过激活β-catenin/Slug信号通路促进子宫颈癌的转移和进展,LPCAT1的靶向治疗有望提高子宫颈癌患者的预后。
文摘目的探究E-钙黏蛋白(E-cadherin)、wnt-1诱导分泌蛋白2(wnt-1 inducible secreted protein-2,WISP2)和Slug蛋白与食管胃交界腺癌(adenocarcinoma of the esophagogastric junction,AEG)临床病理因素及预后的关系。方法选取2021年1月至2022年3月在本院胃肠外科行手术治疗的114例AEG确诊患者,术中留取其癌灶组织与癌旁组织,通过免疫组化染色检测组织中E-cadherin、WISP2、Slug蛋白的表达情况,分析上述指标表达与AEG病理因素的关系,绘制KM曲线探究不同E-cadherin、WISP2、Slug蛋白表达患者的预后情况。结果癌灶组织E-cadherin、WISP2蛋白表达阳性率均低于癌旁组织(P<0.05),但其Slug蛋白表达阳性率高于癌旁组织(P<0.05)。在E-cadherin表达阳性率上,年龄≥50岁患者低于<50岁患者(P<0.05);TNM分期Ⅲ期患者低于Ⅰ~Ⅱ期患者(P<0.05);浸润深度>1/2患者低于≤1/2患者(P<0.05)。在WISP2表达阳性率上,高分化患者低于低、中分化患者(P<0.05);浸润深度>1/2患者低于≤1/2患者(P<0.05)。在Slug蛋白表达阳性率上,高分化高于低、中分化患者(P<0.05);浸润深度>1/2患者高于≤1/2患者(P<0.05);淋巴结转移患者高于无淋巴结转移患者(P<0.05)。Slug蛋白均分别与E-cadherin、WISP2呈负相关(r=-0.301、-0.289,P<0.05)。E-cadherin表达阳性组、阴性组生存时间分别为为(19.71±0.84)个月、(15.85±1.02)个月,阳性组生存时间长于阴性组(P<0.05)。WISP2表达阳性组、阴性组生存时间分别为(19.84±0.83)个月、(18.52±1.82)个月,阳性组生存时间长于阴性组(P<0.05)。Slug表达阳性组、阴性组生存时间分别为为(16.06±0.93)个月、(19.66±0.92)个月,阳性组生存时间短于阴性组(P<0.05)。结论E-cadherin、WISP2、Slug蛋白在AEG患者中异常表达,其表达与AEG的发生、转移以及侵袭等病理因素相关,可作为临床预测AEG患者预后的潜在指标。
基金the support of the Opening Fund of State Key Laboratory of Multiphase Flow in Power Engineering(SKLMF-KF-2102)。
文摘Accurate prediction of the frictional pressure drop is important for the design and operation of subsea oil and gas transporting system considering the length of the pipeline. The applicability of the correlations to pipeline-riser flow needs evaluation since the flow condition in pipeline-riser is quite different from the original data where they were derived from. In the present study, a comprehensive evaluation of 24prevailing correlation in predicting frictional pressure drop is carried out based on experimentally measured data of air-water and air-oil two-phase flows in pipeline-riser. Experiments are performed in a system having different configuration of pipeline-riser with the inclination of the downcomer varied from-2°to-5°to investigated the effect of the elbow on the frictional pressure drop in the riser. The inlet gas velocity ranges from 0.03 to 6.2 m/s, and liquid velocity varies from 0.02 to 1.3 m/s. A total of885 experimental data points including 782 on air-water flows and 103 on air-oil flows are obtained and used to access the prediction ability of the correlations. Comparison of the predicted results with the measured data indicate that a majority of the investigated correlations under-predict the pressure drop on severe slugging. The result of this study highlights the requirement of new method considering the effect of pipe layout on the frictional pressure drop.
文摘In 2023, the world economy was generally sluggish, and recovery remained weak. Under the pretext of “derisking,” the United States(US)-led West has generalized economic security and engaged in punitive, exclusive, and collectivized economic protectionism. Developing countries are struggling.
