The fast and convenient demultiplex of optical vortex(OV) mode is crucial for its further application. We propose a novel approach that combines classic Young's doublet with an OV source to effectively identify th...The fast and convenient demultiplex of optical vortex(OV) mode is crucial for its further application. We propose a novel approach that combines classic Young's doublet with an OV source to effectively identify the OV mode through the analysis of interference patterns. The interference patterns of the OV source incident on the double slits can be perfectly illustrated by using both the classical double-slit interference method and the Huygens–Fresnel principle. The interference fringes will twist along the negative or positive direction of x axis when topological charge(TC)l>0 or l<0, and the degree of the movement varies with the TC, allowing for a quantitative display of the OV characteristics through the interference patterns. Additionally, we deduce analytically that the zeroth-order interference fringe has a linear relationship with the TC and the vertical position. These findings highlight the ability to identify the OV mode by analyzing the interference patterns produced by Young's doublet.展开更多
It is acknowledged that injecting CO_(2) into oil reservoirs and saline aquifers for storage is a practical and affordable method for CO_(2) sequestration.Most CO_(2) produced from industrial exhaust contains impurity...It is acknowledged that injecting CO_(2) into oil reservoirs and saline aquifers for storage is a practical and affordable method for CO_(2) sequestration.Most CO_(2) produced from industrial exhaust contains impurity gases such as H_(2)S that might impact CO_(2) sequestration due to competitive adsorption.This study makes a commendable effort to explore the adsorption behavior of CO_(2)/H_(2)S mixtures in calcite slit nanopores.Grand Canonical Monte Carlo(GCMC)simulation is employed to reveal the adsorption of CO_(2),H_(2)S as well as their binary mixtures in calcite nanopores.Results show that the increase in pressure and temperature can promote and inhibit the adsorption capacity of CO_(2) and H_(2)S in calcite nanopores,respectively.CO_(2)exhibits stronger adsorption on calcite surface than H_(2)S.Electrostatic energy plays the dominating role in the adsorption behavior.Electrostatic energy accounts for 97.11%of the CO_(2)-calcite interaction energy and 56.33%of the H_(2)S-calcite interaction energy at 10 MPa and 323.15 K.The presence of H_(2)S inhibits the CO_(2) adsorption in calcite nanopores due to competitive adsorption,and a higher mole fraction of H_(2)S leads to less CO_(2) adsorption.The quantity of CO_(2) adsorbed is lessened by approximately 33%when the mole fraction of H_(2)S reaches 0.25.CO_(2) molecules preferentially occupy the regions near the po re wall and H_(2)S molecules tend to reside at the center of nanopore even when the molar ratio of CO_(2) is low,indicating that CO_(2) has an adsorption priority on the calcite surface over H_(2)S.In addition,moisture can weaken the adsorption of both CO_(2) and H_(2)S,while CO_(2) is more affected.More interestingly,we find that pure CO_(2) is more suitable to be sequestrated in the shallower formations,i.e.,500-1500 m,whereas CO_(2)with H_(2)S impurity should be settled in the deeper reservoirs.展开更多
We applied adaptive dynamics to double slit interference phenomenon using particle model and obtained partial successful results in our previous report. The patterns qualitatively corresponded well with experiments. S...We applied adaptive dynamics to double slit interference phenomenon using particle model and obtained partial successful results in our previous report. The patterns qualitatively corresponded well with experiments. Several properties such as concave single slit pattern and large influence of slight displacement of the emission position were different from the experimental results. In this study we tried other slit conditions and obtained consistent patterns with experiments. We do not claim that the adaptive dynamics is the principle of quantum mechanics, but the present results support the probability of adaptive dynamics as the candidate of the basis of quantum mechanics. We discuss the advantages of the adaptive dynamical view for foundations of quantum mechanics.展开更多
AIM： To compare the results and complications of early pre-cutting technique with standard technique. METHODS： From January 2003 to December 2004, a total of 426 consecutive therapeutic biliary ERCP procedures were ...AIM： To compare the results and complications of early pre-cutting technique with standard technique. METHODS： From January 2003 to December 2004, a total of 426 consecutive therapeutic biliary ERCP procedures were performed by one endoscopist （T.A.）. Data were retrospectively collected according to procedure indication and results. Of these, 293 procedures （70.4%） were done with standard technique （group A） and 223 procedures （29.6%） with early pre-cutting technique in case of difficult cannulation （group B）. The results and complications of ERCP were compared. RESULTS： Success rate of first attempt cannulation was 98.0% in group A and 87.8% in group 13. The overall incidence of post-ERCP pancreatitis, hemorrhage, perforation and cholangitis was 0%, 0.2%, 0.5% and 0.5%, respectively. Morbidity rate was not significantly different. No procedure-related mortality was occurred. CONCLUSION： For an experienced hand, the early pre-cutting technique for biliary cannulation is safe and effective as standard technique.展开更多
To accurately predict impact loads can ensure the safe operation of debris flow control projects.The instantaneous impact process is usually considered in the calculation of the debris flow impact force;however,the re...To accurately predict impact loads can ensure the safe operation of debris flow control projects.The instantaneous impact process is usually considered in the calculation of the debris flow impact force;however,the redistribution of an impact load after structural regulation is unclear.In this study we deduced the theoretical calculation of a debris flow impact on a double-row slit dam,and carried out a verification experiment on the debris flow impact.The calculation model considers the influence of the debris flow properties,dam arrangement and pile material.The results show that the impact force of the debris flow is obviously affected by the bulk density.When the bulk density is 21 kg/m^(3),the maximum impact force on the pile dam is 1.15 times that when the bulk density is 15 kg/m^(3),but the time it takes for the debris flow to pass through the dam body is reduced by 60%.The larger the relative pile spacing,the more sufficient the flow space and the lower the maximum impact force.The maximum impact force of relative pile spacing of 0.8 is 12%less than that of elative pile spacing of 0.5.The horizontal distribution of the impact force in the mud depth range is parabolic.The maximum impact force on the centre pier is 1.3 times that of a side pier,and the maximum impact force on the dam body appears at the top of the mud depth range.From the vertical distribution of the impact force,the maximum impact force at the highest mud mark is approximately 70%of that of the bottom.With the increase in the relative pile spacing,the longitudinal maximum impact force distribution first decreases and then increases.展开更多
目的:探讨在Van Herick法基础上更方便准确评估前房角宽度的方法。方法:纳入2021-01/12于我院就诊的年龄相关性白内障患者58例69眼,参考Van Herick法分为房角宽度≥1/2颞侧角膜厚度(CT)组(37例44眼)和<1/2CT组(21例25眼),应用超声生...目的:探讨在Van Herick法基础上更方便准确评估前房角宽度的方法。方法:纳入2021-01/12于我院就诊的年龄相关性白内障患者58例69眼,参考Van Herick法分为房角宽度≥1/2颞侧角膜厚度(CT)组(37例44眼)和<1/2CT组(21例25眼),应用超声生物显微镜测量中央前房深度和周边房角度数。结果:房角宽度≥1/2CT组和<1/2CT组患者中央前房深度有明显差异(2.64±0.27 mm vs 2.23±0.29 mm,P<0.01),且两组间上方、颞侧、下方和鼻侧象限房角度数均有明显差异(P<0.01)。房角宽度≥1/2CT组患者上方与下方象限房角度数无显著差异(P>0.05),其余各象限房角度数均有差异(P<0.05);房角宽度<1/2CT组患者上方与鼻、颞侧象限,下方与颞侧象限房角度数均有差异(P<0.05)。结论:裂隙灯下采用Van Herick法评估颞侧房角宽度,同时评估下方象限房角宽度,可以更简单、快速、准确地评估前房角的整体情况。展开更多
目的明确门诊行裂隙灯显微镜下结膜囊肿取出术治疗结膜囊肿的疗效和安全性。方法在门诊病历系统收集2018年3月至2020年3月在中山大学中山眼科中心门诊行裂隙灯显微镜下结膜囊肿取出术共56例57眼结膜囊肿患者。手术过程:术前结膜囊清洁,...目的明确门诊行裂隙灯显微镜下结膜囊肿取出术治疗结膜囊肿的疗效和安全性。方法在门诊病历系统收集2018年3月至2020年3月在中山大学中山眼科中心门诊行裂隙灯显微镜下结膜囊肿取出术共56例57眼结膜囊肿患者。手术过程:术前结膜囊清洁,丙美卡因表面麻醉后,由高年资眼科专科护士在裂隙灯下采用负压抽吸囊肿,完整吸出囊膜,术毕涂抗生素眼药膏。术后随访观察眼表疾病指数(OSDI评分)、复发情况、并发症和患者就医体验。结果56例患者行裂隙灯显微镜下结膜囊肿取出术的手术成功率为100%,患者未出现并发症。患者术后28 d OSDI评分较术前降低,差异有统计学意义(P<0.001),患者就医体验良好,随访1个月、6个月、2年,回访无复发。结论门诊行裂隙灯显微镜下结膜囊肿取出术方便快速,创伤小,术后伤口愈合良好,具有安全性、可行性和有效性,效果好,患者就医体验良好。展开更多
基金Project supported by the National Key Research and Development Program of China (Grant Nos.2020YFA0710100 and 2023YFA1407100)the National Natural Science Foundation of China (Grant Nos.92050102 and 12374410)+2 种基金the Jiangxi Provincial Natural Science Foundation (Grant No.20224ACB201005)the Fundamental Research Funds for the Central Universities (Grant Nos.20720230102 and 20720220033)China Scholarship Council (Grant No.202206310009)。
文摘The fast and convenient demultiplex of optical vortex(OV) mode is crucial for its further application. We propose a novel approach that combines classic Young's doublet with an OV source to effectively identify the OV mode through the analysis of interference patterns. The interference patterns of the OV source incident on the double slits can be perfectly illustrated by using both the classical double-slit interference method and the Huygens–Fresnel principle. The interference fringes will twist along the negative or positive direction of x axis when topological charge(TC)l>0 or l<0, and the degree of the movement varies with the TC, allowing for a quantitative display of the OV characteristics through the interference patterns. Additionally, we deduce analytically that the zeroth-order interference fringe has a linear relationship with the TC and the vertical position. These findings highlight the ability to identify the OV mode by analyzing the interference patterns produced by Young's doublet.
基金financial support from the National Natural Science Foundation of China (Grant No.52004320)the Science Foundation of China University of Petroleum,Beijing (No.2462021QNXZ012,No.2462022BJRC001,and No.2462021YJRC012)the funding from the State Key Laboratory of Petroleum Resources and Engineering (No.PRP/indep-1-2103)。
文摘It is acknowledged that injecting CO_(2) into oil reservoirs and saline aquifers for storage is a practical and affordable method for CO_(2) sequestration.Most CO_(2) produced from industrial exhaust contains impurity gases such as H_(2)S that might impact CO_(2) sequestration due to competitive adsorption.This study makes a commendable effort to explore the adsorption behavior of CO_(2)/H_(2)S mixtures in calcite slit nanopores.Grand Canonical Monte Carlo(GCMC)simulation is employed to reveal the adsorption of CO_(2),H_(2)S as well as their binary mixtures in calcite nanopores.Results show that the increase in pressure and temperature can promote and inhibit the adsorption capacity of CO_(2) and H_(2)S in calcite nanopores,respectively.CO_(2)exhibits stronger adsorption on calcite surface than H_(2)S.Electrostatic energy plays the dominating role in the adsorption behavior.Electrostatic energy accounts for 97.11%of the CO_(2)-calcite interaction energy and 56.33%of the H_(2)S-calcite interaction energy at 10 MPa and 323.15 K.The presence of H_(2)S inhibits the CO_(2) adsorption in calcite nanopores due to competitive adsorption,and a higher mole fraction of H_(2)S leads to less CO_(2) adsorption.The quantity of CO_(2) adsorbed is lessened by approximately 33%when the mole fraction of H_(2)S reaches 0.25.CO_(2) molecules preferentially occupy the regions near the po re wall and H_(2)S molecules tend to reside at the center of nanopore even when the molar ratio of CO_(2) is low,indicating that CO_(2) has an adsorption priority on the calcite surface over H_(2)S.In addition,moisture can weaken the adsorption of both CO_(2) and H_(2)S,while CO_(2) is more affected.More interestingly,we find that pure CO_(2) is more suitable to be sequestrated in the shallower formations,i.e.,500-1500 m,whereas CO_(2)with H_(2)S impurity should be settled in the deeper reservoirs.
文摘We applied adaptive dynamics to double slit interference phenomenon using particle model and obtained partial successful results in our previous report. The patterns qualitatively corresponded well with experiments. Several properties such as concave single slit pattern and large influence of slight displacement of the emission position were different from the experimental results. In this study we tried other slit conditions and obtained consistent patterns with experiments. We do not claim that the adaptive dynamics is the principle of quantum mechanics, but the present results support the probability of adaptive dynamics as the candidate of the basis of quantum mechanics. We discuss the advantages of the adaptive dynamical view for foundations of quantum mechanics.
文摘AIM： To compare the results and complications of early pre-cutting technique with standard technique. METHODS： From January 2003 to December 2004, a total of 426 consecutive therapeutic biliary ERCP procedures were performed by one endoscopist （T.A.）. Data were retrospectively collected according to procedure indication and results. Of these, 293 procedures （70.4%） were done with standard technique （group A） and 223 procedures （29.6%） with early pre-cutting technique in case of difficult cannulation （group B）. The results and complications of ERCP were compared. RESULTS： Success rate of first attempt cannulation was 98.0% in group A and 87.8% in group 13. The overall incidence of post-ERCP pancreatitis, hemorrhage, perforation and cholangitis was 0%, 0.2%, 0.5% and 0.5%, respectively. Morbidity rate was not significantly different. No procedure-related mortality was occurred. CONCLUSION： For an experienced hand, the early pre-cutting technique for biliary cannulation is safe and effective as standard technique.
基金funded by the Second Scientific Expedition to Qinghai-Tibet Plateau (Grant No.2019QZKK0902)the National Natural Science Foundation of China (Grant No.42201095)+2 种基金the Natural Science Foundation of Sichuan (Grant No.2022NSFSC1032)the Sichuan Provincial Transportation Science and Technology Project (2021-A-08)the Key science and technology projects of transportation industry (2021-MS4-104)
文摘To accurately predict impact loads can ensure the safe operation of debris flow control projects.The instantaneous impact process is usually considered in the calculation of the debris flow impact force;however,the redistribution of an impact load after structural regulation is unclear.In this study we deduced the theoretical calculation of a debris flow impact on a double-row slit dam,and carried out a verification experiment on the debris flow impact.The calculation model considers the influence of the debris flow properties,dam arrangement and pile material.The results show that the impact force of the debris flow is obviously affected by the bulk density.When the bulk density is 21 kg/m^(3),the maximum impact force on the pile dam is 1.15 times that when the bulk density is 15 kg/m^(3),but the time it takes for the debris flow to pass through the dam body is reduced by 60%.The larger the relative pile spacing,the more sufficient the flow space and the lower the maximum impact force.The maximum impact force of relative pile spacing of 0.8 is 12%less than that of elative pile spacing of 0.5.The horizontal distribution of the impact force in the mud depth range is parabolic.The maximum impact force on the centre pier is 1.3 times that of a side pier,and the maximum impact force on the dam body appears at the top of the mud depth range.From the vertical distribution of the impact force,the maximum impact force at the highest mud mark is approximately 70%of that of the bottom.With the increase in the relative pile spacing,the longitudinal maximum impact force distribution first decreases and then increases.
文摘目的:探讨在Van Herick法基础上更方便准确评估前房角宽度的方法。方法:纳入2021-01/12于我院就诊的年龄相关性白内障患者58例69眼,参考Van Herick法分为房角宽度≥1/2颞侧角膜厚度(CT)组(37例44眼)和<1/2CT组(21例25眼),应用超声生物显微镜测量中央前房深度和周边房角度数。结果:房角宽度≥1/2CT组和<1/2CT组患者中央前房深度有明显差异(2.64±0.27 mm vs 2.23±0.29 mm,P<0.01),且两组间上方、颞侧、下方和鼻侧象限房角度数均有明显差异(P<0.01)。房角宽度≥1/2CT组患者上方与下方象限房角度数无显著差异(P>0.05),其余各象限房角度数均有差异(P<0.05);房角宽度<1/2CT组患者上方与鼻、颞侧象限,下方与颞侧象限房角度数均有差异(P<0.05)。结论:裂隙灯下采用Van Herick法评估颞侧房角宽度,同时评估下方象限房角宽度,可以更简单、快速、准确地评估前房角的整体情况。
文摘目的明确门诊行裂隙灯显微镜下结膜囊肿取出术治疗结膜囊肿的疗效和安全性。方法在门诊病历系统收集2018年3月至2020年3月在中山大学中山眼科中心门诊行裂隙灯显微镜下结膜囊肿取出术共56例57眼结膜囊肿患者。手术过程:术前结膜囊清洁,丙美卡因表面麻醉后,由高年资眼科专科护士在裂隙灯下采用负压抽吸囊肿,完整吸出囊膜,术毕涂抗生素眼药膏。术后随访观察眼表疾病指数(OSDI评分)、复发情况、并发症和患者就医体验。结果56例患者行裂隙灯显微镜下结膜囊肿取出术的手术成功率为100%,患者未出现并发症。患者术后28 d OSDI评分较术前降低,差异有统计学意义(P<0.001),患者就医体验良好,随访1个月、6个月、2年,回访无复发。结论门诊行裂隙灯显微镜下结膜囊肿取出术方便快速,创伤小,术后伤口愈合良好,具有安全性、可行性和有效性,效果好,患者就医体验良好。
