BACKGROUND Transcatheter arterial chemoembolization(TACE)is a key treatment approach for advanced invasive liver cancer(infiltrative hepatocellular carcinoma).However,its therapeutic response can be difficult to evalu...BACKGROUND Transcatheter arterial chemoembolization(TACE)is a key treatment approach for advanced invasive liver cancer(infiltrative hepatocellular carcinoma).However,its therapeutic response can be difficult to evaluate accurately using conventional two-dimensional imaging criteria due to the tumor’s diffuse and multifocal growth pattern.Volumetric imaging,especially enhanced tumor volume(ETV),offers a more comprehensive assessment.Nonetheless,bias field inhomogeneity in magnetic resonance imaging(MRI)poses challenges,potentially skewing volumetric measurements and undermining prognostic evaluation.AIM To investigate whether MRI bias field correction enhances the accuracy of volumetric assessment of infiltrative hepatocellular carcinoma treated with TACE,and to analyze how this improved measurement impacts prognostic prediction.METHODS We retrospectively collected data from 105 patients with invasive liver cancer who underwent TACE treatment at the Affiliated Hospital of Xuzhou Medical University from January 2020 to January 2024.The improved N4 bias field correction algorithm was applied to process MRI images,and the ETV before and after treatment was calculated.The ETV measurements before and after correction were compared,and their relationship with patient prognosis was analyzed.A Cox proportional hazards model was used to evaluate prognostic factors,with Martingale residual analysis determining the optimal cutoff value,followed by survival analysis.RESULTS Bias field correction significantly affected ETV measurements,with the corrected baseline ETV mean(505.235 cm^(3))being significantly lower than before correction(825.632 cm^(3),P<0.001).Cox analysis showed that the hazard ratio(HR)for corrected baseline ETV(HR=1.165,95%CI:1.069-1.268)was higher than before correction(HR=1.063,95%CI:1.031-1.095).Using 412 cm^(3) as the cutoff,the group with baseline ETV<415 cm^(3) had a longer median survival time compared to the≥415 cm^(3) group(18.523 months vs 8.926 months,P<0.001).The group with an ETV reduction rate≥41%had better prognosis than the<41%group(17.862 months vs 9.235 months,P=0.006).Multivariate analysis confirmed that ETV reduction rate(HR=0.412,P<0.001),Child-Pugh classification(HR=0.298,P<0.001),and Barcelona Clinic Liver Cancer stage(HR=0.578,P=0.045)were independent prognostic factors.CONCLUSION Volume imaging based on MRI bias field correction can improve the accuracy of evaluating the efficacy of TACE treatment for invasive liver cancer.The corrected ETV and its reduction rate can serve as independent indicators for predicting patient prognosis,providing important reference for developing individualized treatment strategies.展开更多
Various approaches and models are used in deterministic codes to treat the resonance self-shielding behavior of cross-sections.The accuracy of the models used has a significant effect on the precision of calculations;...Various approaches and models are used in deterministic codes to treat the resonance self-shielding behavior of cross-sections.The accuracy of the models used has a significant effect on the precision of calculations;hence it is essential to select the best self-shielding method that yields accurate results within a reasonable computational time.In the present paper,the performance of the statistical subgroup method and the subgroup projection method associated with the DRAGON5 code is assessed during the burnup of a fuel pin.Two types of fuel are investigated:UO2,and PuO2-UO2.The accuracy of the methods is determined by calculating the variation of the infinite multiplication factor and the reaction rates during burnup,and then the results are compared to the stochastic MCNP6 code.It is indicated that the performance of both methods in treating the resonance self-shielding effect is satisfactory and that the subgroup projection method has a better performance during burnup calculations.展开更多
Five phospholipids in human placenta were determined by phosphorus 31 nuclear magnetic resonance(^(31)P NMR)spectroscopy and thin-layer chromatography(TLC) scanning combined with the corrective method of absorbance pr...Five phospholipids in human placenta were determined by phosphorus 31 nuclear magnetic resonance(^(31)P NMR)spectroscopy and thin-layer chromatography(TLC) scanning combined with the corrective method of absorbance proportional coefficient. The NMR spectrometer used this investigation was a Bruker AM-500 spectrometer operating at 202.4 MHz for ^(31)P chemical shifts are relative to 85% phosphoric acid. TIC was carried out by silica gel H plate developed in chloroform-methanol-glacial acetic acid-ethanol-water(25:4:6:2:0.5),with Vaskovsky reagent as colour -developing agent of phospholipids.展开更多
BACKGROUND Non-invasive assessment of non-alcoholic steatohepatitis(NASH)is increasing in desirability due to the invasive nature and costs associated with the current form of assessment;liver biopsy.Quantitative mult...BACKGROUND Non-invasive assessment of non-alcoholic steatohepatitis(NASH)is increasing in desirability due to the invasive nature and costs associated with the current form of assessment;liver biopsy.Quantitative multiparametric magnetic resonance imaging(mpMRI)to measure liver fat(proton density fat fraction)and fibroinflammatory disease[iron-corrected T1(cT1)],as well as elastography techniques[vibration-controlled transient elastography(VCTE)liver stiffness measure],magnetic resonance elastography(MRE)and 2D Shear-Wave elastography(SWE)to measure stiffness and fat(controlled attenuated parameter,CAP)are emerging alternatives which could be utilised as safe surrogates to liver biopsy.AIM To evaluate the agreement of non-invasive imaging modalities with liver biopsy,and their subsequent diagnostic accuracy for identifying NASH patients.METHODS From January 2019 to February 2020,Japanese patients suspected of NASH were recruited onto a prospective,observational study and were screened using noninvasive imaging techniques;mpMRI with LiverMultiScan®,VCTE,MRE and 2DSWE.Patients were subsequently biopsied,and samples were scored by three independent pathologists.The diagnostic performances of the non-invasive imaging modalities were assessed using area under receiver operating characteristic curve(AUC)with the median of the histology scores as the gold standard diagnoses.Concordance between all three independent pathologists was further explored using Krippendorff’s alpha(a)from weighted kappa statistics.RESULTS N=145 patients with mean age of 60(SD:13 years.),39%females,and 40%with body mass index≥30 kg/m2 were included in the analysis.For identifying patients with NASH,MR liver fat and cT1 were the strongest performing individual measures(AUC:0.80 and 0.75 respectively),and the mpMRI metrics combined(cT1 and MR liver fat)were the overall best non-invasive test(AUC:0.83).For identifying fibrosis≥1,MRE performed best(AUC:0.97),compared to VCTE-liver stiffness measure(AUC:0.94)and 2D-SWE(AUC:0.94).For assessment of steatosis≥1,MR liver fat was the best performing non-invasive test(AUC:0.92),compared to controlled attenuated parameter(AUC:0.75).Assessment of the agreement between pathologists showed that concordance was best for steatosis(a=0.58),moderate for ballooning(a=0.40)and fibrosis(a=0.40),and worst for lobular inflammation(a=0.11).CONCLUSION Quantitative mpMRI is an effective alternative to liver biopsy for diagnosing NASH and non-alcoholic fatty liver,and thus may offer clinical utility in patient management.展开更多
Functional magnetic resonance imaging（fMRI）is one of the most commonly used methods in cognitive neuroscience on humans.In recent decades,fMRI has also been used in the awake monkey experiments to localize functiona...Functional magnetic resonance imaging（fMRI）is one of the most commonly used methods in cognitive neuroscience on humans.In recent decades,fMRI has also been used in the awake monkey experiments to localize functional brain areas and to compare the functional differences between human and monkey brains.Several procedures and paradigms have been developed to maintain proper head fixation and to perform motion control training.In this study,we extended the application of fMRI to awake cats without training,receiving a flickering checkerboard visual stimulus projected to a screen in front of them in a block-design paradigm.We found that body movement-induced non-rigid motion introduced artifacts into the functional scans,especially those around the eye and neck.To correct for these artifacts,we developed two methods：one for general experimental design,and the other for studies of whether a checkerboard task could be used as a localizer to optimize the motioncorrection parameters.The results demonstrated that,with proper animal fixation and motion correction procedures,it is possible to perform fMRI experiments with untrained awake cats.展开更多
针对海上油田中油基泥浆滤液侵入导致的储层核磁共振(Nuclear Magnetic Resonance,NMR)测井横向弛豫时间(Transverse Relaxation Time,T_(2))谱“拖尾”现象,提出了一种基于储层物性约束的T_(2)谱分段校正方法,并研发了可挂接于CIFLog...针对海上油田中油基泥浆滤液侵入导致的储层核磁共振(Nuclear Magnetic Resonance,NMR)测井横向弛豫时间(Transverse Relaxation Time,T_(2))谱“拖尾”现象,提出了一种基于储层物性约束的T_(2)谱分段校正方法,并研发了可挂接于CIFLog测井综合解释平台的插件模块。该方法以渗透率为校正判别阈值,按孔隙度分段构建多级物性区间,结合流体类型特征建立校正系数数据库,并在算法中引入积分面积守恒约束,确保校正前后T_(2)谱总面积一致,从物理层面保持孔隙度的真实性。模块采用插件化设计,实现了数据自动匹配、系数管理、计算可视化及结果输出等功能。南海北部湾盆地两口油基泥浆井的应用结果表明,校正后T_(2)谱“拖尾”现象得到明显抑制,长弛豫时间端幅值较原始T_(2)谱平均降低6.86%~10.61%,谱形与储层物性特征更加一致,测井解释结果与常规曲线及岩心资料匹配良好,验证了所建方法的稳定性与工程适用性。研究成果为复杂钻井条件下的核磁测井定量解释提供了可靠的技术支撑。展开更多
<strong>Introduction:</strong><span style="white-space:normal;"><span style="font-family:;" "=""> Congenitally corrected transposition of the great arter...<strong>Introduction:</strong><span style="white-space:normal;"><span style="font-family:;" "=""> Congenitally corrected transposition of the great arteries (CCTGA) is a rare heart disease that encompasses an atrioventricular and ventriculoarterial discordance and accounts for less than 1 percent of congenital heart diseases. <b>Objective: </b></span></span><span style="white-space:normal;"><span style="font-family:;" "="">To p</span></span><span style="white-space:normal;"><span style="font-family:;" "="">resent </span></span><span style="white-space:normal;"><span style="font-family:;" "="">an </span></span><span style="white-space:normal;"><span style="font-family:;" "="">atypical case of a man with complex congenital heart disease and conduction anomalies. <b>Case Presentation:</b> This is a case of a 34-year-old patient who came to the hospital with 1 week of dyspnea on exertion and episodes of lipothymia. The patient was referred to our hospital after an electrocardiogram from his primary care with evidence of blocked atrial fibrillation. During the initial evaluation blocked atrial fibrillation was confirmed with a rescue ventricular rate of 38 bpm. A magnetic resonance confirmed the presence of the atrioventricular and ventriculoarterial discordance, the aorta had a left anterior position, perimembranous ventricular septal defect with a right to left shunt, biventricular systolic dysfunction, moderate tricuspid, and mitral regurgitation, interventricular septal intramyocardial and biatrial fibrosis, left</span> </span><span style="white-space:normal;"><span style="font-family:;" "="">atrial dilation, and dilation of the pulmonary artery. After pacemaker placement, the patient has an improvement in his clinical symptoms and quality of life. <b>Conclusions:</b> Cardiac arrhythmias are CCTGA’s leading cause of death, mostly ventricular tachycardia, and atrial fibrillation. Right bundle branch block is a previously unreported and potentially very rare presentation of this disease. This, added to the fact that our patient was diagnosed at an advanced age, but without symptoms of heart failure, makes</span></span><span style="white-space:normal;"><span style="font-family:;" "=""> </span></span><span style="white-space:normal;"><span style="font-family:;" "="">him</span></span><span style="white-space:normal;"><span style="font-family:;" "=""> </span></span><span style="white-space:normal;"><span style="font-family:;" "="">an atypical case of CCTGA, with new potential treatment options.</span></span>展开更多
页岩油勘探开发中,含油饱和度是评价页岩油资源量的关键参数。目前针对页岩油饱和度的计算方法主要集中在实验评价上,利用录井资料进行饱和度评价的研究较少。该文以核磁共振(Nuclear Magnetic Resonance,NMR)实验及密闭热释烃录井为基...页岩油勘探开发中,含油饱和度是评价页岩油资源量的关键参数。目前针对页岩油饱和度的计算方法主要集中在实验评价上,利用录井资料进行饱和度评价的研究较少。该文以核磁共振(Nuclear Magnetic Resonance,NMR)实验及密闭热释烃录井为基础,提出了一种基于地化录井数据的页岩油饱和度计算方法。通过多状态NMR实验,构建了涠西南凹陷NMR流体组分图版,并基于流体体积法计算得到NMR饱和度。同时,利用密闭热释烃实验获得可动油含量及总含油量。综合这两种实验结果,并结合岩石密度、总孔隙度等参数,进一步构建了基于NMR技术的改进密闭热释录井饱和度模型。在模型实际应用中,考虑到现场地化录井过程中烃含量可能存在损失,通过密闭热释录井数据构建损失烃校正模型。通过上述方法,形成了一种以地化录井数据为基础计算页岩含油饱和度的评价方法。实例处理结果显示,该方法计算得到的可动油饱和度绝对误差为3.82%,含油饱和度绝对误差为8.81%。计算结果的范围分别为11%~46%和30%~91%。这一方法为利用录井资料评价页岩储层饱和度提供了新的思路。展开更多
Errors were introduced during the typesetting process by the Editorial Office.We sincerely apologize to the authors and our readers for this oversight.The corrections are as follows:1.Author ORCIDs:The following ORCID...Errors were introduced during the typesetting process by the Editorial Office.We sincerely apologize to the authors and our readers for this oversight.The corrections are as follows:1.Author ORCIDs:The following ORCIDs have been added to the author list:Yangfan Guo:https://orcid.org/0009-0009-1817-7959 Shaojie Chen:https://orcid.org/0009-0005-1235-2411 Wencong Mei:https://orcid.org/0009-0009-7635-6998 Hanrui Hu:https://orcid.org/0009-0006-7760-3338 Dongyang Chen:https://orcid.org/0000-0001-6264-060X 2.Abstract:The phrase"to access"has been corrected to"by accessing".3.Page 2,Line 3 in left column:The sentence"The CLS system was expected to exhibit limited experimental efficiency"has been corrected to"The CLS system exhibited limited experimental efficiency as expected".4.Page 3,Line 19 in left column:the$symbol should be removed.展开更多
A whispering gallery mode resonator(WGMR)filter can narrow laser linewidth while significantly changing the output power characteristics of fiber laser system.It is found that traditional laser output power model is i...A whispering gallery mode resonator(WGMR)filter can narrow laser linewidth while significantly changing the output power characteristics of fiber laser system.It is found that traditional laser output power model is invalid.We report a correction model of a narrow linewidth fiber laser filtered with a WGMR to analyze its power.We believe that the loss of the laser system and the threshold gain increase caused by the WGMR filter lead to the predominate amplified spontaneous emission during the original laser period.According to that,we assume the correction coefficient is an exponential decay related to the Er-doped fiber length in the large loss situation,and we verify it experimentally.As a result,the correction model is valid for WGMR-filtered fiber laser.展开更多
文摘BACKGROUND Transcatheter arterial chemoembolization(TACE)is a key treatment approach for advanced invasive liver cancer(infiltrative hepatocellular carcinoma).However,its therapeutic response can be difficult to evaluate accurately using conventional two-dimensional imaging criteria due to the tumor’s diffuse and multifocal growth pattern.Volumetric imaging,especially enhanced tumor volume(ETV),offers a more comprehensive assessment.Nonetheless,bias field inhomogeneity in magnetic resonance imaging(MRI)poses challenges,potentially skewing volumetric measurements and undermining prognostic evaluation.AIM To investigate whether MRI bias field correction enhances the accuracy of volumetric assessment of infiltrative hepatocellular carcinoma treated with TACE,and to analyze how this improved measurement impacts prognostic prediction.METHODS We retrospectively collected data from 105 patients with invasive liver cancer who underwent TACE treatment at the Affiliated Hospital of Xuzhou Medical University from January 2020 to January 2024.The improved N4 bias field correction algorithm was applied to process MRI images,and the ETV before and after treatment was calculated.The ETV measurements before and after correction were compared,and their relationship with patient prognosis was analyzed.A Cox proportional hazards model was used to evaluate prognostic factors,with Martingale residual analysis determining the optimal cutoff value,followed by survival analysis.RESULTS Bias field correction significantly affected ETV measurements,with the corrected baseline ETV mean(505.235 cm^(3))being significantly lower than before correction(825.632 cm^(3),P<0.001).Cox analysis showed that the hazard ratio(HR)for corrected baseline ETV(HR=1.165,95%CI:1.069-1.268)was higher than before correction(HR=1.063,95%CI:1.031-1.095).Using 412 cm^(3) as the cutoff,the group with baseline ETV<415 cm^(3) had a longer median survival time compared to the≥415 cm^(3) group(18.523 months vs 8.926 months,P<0.001).The group with an ETV reduction rate≥41%had better prognosis than the<41%group(17.862 months vs 9.235 months,P=0.006).Multivariate analysis confirmed that ETV reduction rate(HR=0.412,P<0.001),Child-Pugh classification(HR=0.298,P<0.001),and Barcelona Clinic Liver Cancer stage(HR=0.578,P=0.045)were independent prognostic factors.CONCLUSION Volume imaging based on MRI bias field correction can improve the accuracy of evaluating the efficacy of TACE treatment for invasive liver cancer.The corrected ETV and its reduction rate can serve as independent indicators for predicting patient prognosis,providing important reference for developing individualized treatment strategies.
文摘Various approaches and models are used in deterministic codes to treat the resonance self-shielding behavior of cross-sections.The accuracy of the models used has a significant effect on the precision of calculations;hence it is essential to select the best self-shielding method that yields accurate results within a reasonable computational time.In the present paper,the performance of the statistical subgroup method and the subgroup projection method associated with the DRAGON5 code is assessed during the burnup of a fuel pin.Two types of fuel are investigated:UO2,and PuO2-UO2.The accuracy of the methods is determined by calculating the variation of the infinite multiplication factor and the reaction rates during burnup,and then the results are compared to the stochastic MCNP6 code.It is indicated that the performance of both methods in treating the resonance self-shielding effect is satisfactory and that the subgroup projection method has a better performance during burnup calculations.
文摘Five phospholipids in human placenta were determined by phosphorus 31 nuclear magnetic resonance(^(31)P NMR)spectroscopy and thin-layer chromatography(TLC) scanning combined with the corrective method of absorbance proportional coefficient. The NMR spectrometer used this investigation was a Bruker AM-500 spectrometer operating at 202.4 MHz for ^(31)P chemical shifts are relative to 85% phosphoric acid. TIC was carried out by silica gel H plate developed in chloroform-methanol-glacial acetic acid-ethanol-water(25:4:6:2:0.5),with Vaskovsky reagent as colour -developing agent of phospholipids.
文摘BACKGROUND Non-invasive assessment of non-alcoholic steatohepatitis(NASH)is increasing in desirability due to the invasive nature and costs associated with the current form of assessment;liver biopsy.Quantitative multiparametric magnetic resonance imaging(mpMRI)to measure liver fat(proton density fat fraction)and fibroinflammatory disease[iron-corrected T1(cT1)],as well as elastography techniques[vibration-controlled transient elastography(VCTE)liver stiffness measure],magnetic resonance elastography(MRE)and 2D Shear-Wave elastography(SWE)to measure stiffness and fat(controlled attenuated parameter,CAP)are emerging alternatives which could be utilised as safe surrogates to liver biopsy.AIM To evaluate the agreement of non-invasive imaging modalities with liver biopsy,and their subsequent diagnostic accuracy for identifying NASH patients.METHODS From January 2019 to February 2020,Japanese patients suspected of NASH were recruited onto a prospective,observational study and were screened using noninvasive imaging techniques;mpMRI with LiverMultiScan®,VCTE,MRE and 2DSWE.Patients were subsequently biopsied,and samples were scored by three independent pathologists.The diagnostic performances of the non-invasive imaging modalities were assessed using area under receiver operating characteristic curve(AUC)with the median of the histology scores as the gold standard diagnoses.Concordance between all three independent pathologists was further explored using Krippendorff’s alpha(a)from weighted kappa statistics.RESULTS N=145 patients with mean age of 60(SD:13 years.),39%females,and 40%with body mass index≥30 kg/m2 were included in the analysis.For identifying patients with NASH,MR liver fat and cT1 were the strongest performing individual measures(AUC:0.80 and 0.75 respectively),and the mpMRI metrics combined(cT1 and MR liver fat)were the overall best non-invasive test(AUC:0.83).For identifying fibrosis≥1,MRE performed best(AUC:0.97),compared to VCTE-liver stiffness measure(AUC:0.94)and 2D-SWE(AUC:0.94).For assessment of steatosis≥1,MR liver fat was the best performing non-invasive test(AUC:0.92),compared to controlled attenuated parameter(AUC:0.75).Assessment of the agreement between pathologists showed that concordance was best for steatosis(a=0.58),moderate for ballooning(a=0.40)and fibrosis(a=0.40),and worst for lobular inflammation(a=0.11).CONCLUSION Quantitative mpMRI is an effective alternative to liver biopsy for diagnosing NASH and non-alcoholic fatty liver,and thus may offer clinical utility in patient management.
基金supported by grants from the Ministry of Science and Technology of China (2012CB825500, 2012IM030100, 2010IM030800)the National Natural Science Foundation of China (91132302, 90820307)
文摘Functional magnetic resonance imaging（fMRI）is one of the most commonly used methods in cognitive neuroscience on humans.In recent decades,fMRI has also been used in the awake monkey experiments to localize functional brain areas and to compare the functional differences between human and monkey brains.Several procedures and paradigms have been developed to maintain proper head fixation and to perform motion control training.In this study,we extended the application of fMRI to awake cats without training,receiving a flickering checkerboard visual stimulus projected to a screen in front of them in a block-design paradigm.We found that body movement-induced non-rigid motion introduced artifacts into the functional scans,especially those around the eye and neck.To correct for these artifacts,we developed two methods：one for general experimental design,and the other for studies of whether a checkerboard task could be used as a localizer to optimize the motioncorrection parameters.The results demonstrated that,with proper animal fixation and motion correction procedures,it is possible to perform fMRI experiments with untrained awake cats.
文摘针对海上油田中油基泥浆滤液侵入导致的储层核磁共振(Nuclear Magnetic Resonance,NMR)测井横向弛豫时间(Transverse Relaxation Time,T_(2))谱“拖尾”现象,提出了一种基于储层物性约束的T_(2)谱分段校正方法,并研发了可挂接于CIFLog测井综合解释平台的插件模块。该方法以渗透率为校正判别阈值,按孔隙度分段构建多级物性区间,结合流体类型特征建立校正系数数据库,并在算法中引入积分面积守恒约束,确保校正前后T_(2)谱总面积一致,从物理层面保持孔隙度的真实性。模块采用插件化设计,实现了数据自动匹配、系数管理、计算可视化及结果输出等功能。南海北部湾盆地两口油基泥浆井的应用结果表明,校正后T_(2)谱“拖尾”现象得到明显抑制,长弛豫时间端幅值较原始T_(2)谱平均降低6.86%~10.61%,谱形与储层物性特征更加一致,测井解释结果与常规曲线及岩心资料匹配良好,验证了所建方法的稳定性与工程适用性。研究成果为复杂钻井条件下的核磁测井定量解释提供了可靠的技术支撑。
文摘<strong>Introduction:</strong><span style="white-space:normal;"><span style="font-family:;" "=""> Congenitally corrected transposition of the great arteries (CCTGA) is a rare heart disease that encompasses an atrioventricular and ventriculoarterial discordance and accounts for less than 1 percent of congenital heart diseases. <b>Objective: </b></span></span><span style="white-space:normal;"><span style="font-family:;" "="">To p</span></span><span style="white-space:normal;"><span style="font-family:;" "="">resent </span></span><span style="white-space:normal;"><span style="font-family:;" "="">an </span></span><span style="white-space:normal;"><span style="font-family:;" "="">atypical case of a man with complex congenital heart disease and conduction anomalies. <b>Case Presentation:</b> This is a case of a 34-year-old patient who came to the hospital with 1 week of dyspnea on exertion and episodes of lipothymia. The patient was referred to our hospital after an electrocardiogram from his primary care with evidence of blocked atrial fibrillation. During the initial evaluation blocked atrial fibrillation was confirmed with a rescue ventricular rate of 38 bpm. A magnetic resonance confirmed the presence of the atrioventricular and ventriculoarterial discordance, the aorta had a left anterior position, perimembranous ventricular septal defect with a right to left shunt, biventricular systolic dysfunction, moderate tricuspid, and mitral regurgitation, interventricular septal intramyocardial and biatrial fibrosis, left</span> </span><span style="white-space:normal;"><span style="font-family:;" "="">atrial dilation, and dilation of the pulmonary artery. After pacemaker placement, the patient has an improvement in his clinical symptoms and quality of life. <b>Conclusions:</b> Cardiac arrhythmias are CCTGA’s leading cause of death, mostly ventricular tachycardia, and atrial fibrillation. Right bundle branch block is a previously unreported and potentially very rare presentation of this disease. This, added to the fact that our patient was diagnosed at an advanced age, but without symptoms of heart failure, makes</span></span><span style="white-space:normal;"><span style="font-family:;" "=""> </span></span><span style="white-space:normal;"><span style="font-family:;" "="">him</span></span><span style="white-space:normal;"><span style="font-family:;" "=""> </span></span><span style="white-space:normal;"><span style="font-family:;" "="">an atypical case of CCTGA, with new potential treatment options.</span></span>
文摘页岩油勘探开发中,含油饱和度是评价页岩油资源量的关键参数。目前针对页岩油饱和度的计算方法主要集中在实验评价上,利用录井资料进行饱和度评价的研究较少。该文以核磁共振(Nuclear Magnetic Resonance,NMR)实验及密闭热释烃录井为基础,提出了一种基于地化录井数据的页岩油饱和度计算方法。通过多状态NMR实验,构建了涠西南凹陷NMR流体组分图版,并基于流体体积法计算得到NMR饱和度。同时,利用密闭热释烃实验获得可动油含量及总含油量。综合这两种实验结果,并结合岩石密度、总孔隙度等参数,进一步构建了基于NMR技术的改进密闭热释录井饱和度模型。在模型实际应用中,考虑到现场地化录井过程中烃含量可能存在损失,通过密闭热释录井数据构建损失烃校正模型。通过上述方法,形成了一种以地化录井数据为基础计算页岩含油饱和度的评价方法。实例处理结果显示,该方法计算得到的可动油饱和度绝对误差为3.82%,含油饱和度绝对误差为8.81%。计算结果的范围分别为11%~46%和30%~91%。这一方法为利用录井资料评价页岩储层饱和度提供了新的思路。
基金National Key R&D Program of China(2023YFE0101600,2023YFA1606403,2022YFA1605100)National Natural Science Foundation of China(12027809,12350007)。
文摘Errors were introduced during the typesetting process by the Editorial Office.We sincerely apologize to the authors and our readers for this oversight.The corrections are as follows:1.Author ORCIDs:The following ORCIDs have been added to the author list:Yangfan Guo:https://orcid.org/0009-0009-1817-7959 Shaojie Chen:https://orcid.org/0009-0005-1235-2411 Wencong Mei:https://orcid.org/0009-0009-7635-6998 Hanrui Hu:https://orcid.org/0009-0006-7760-3338 Dongyang Chen:https://orcid.org/0000-0001-6264-060X 2.Abstract:The phrase"to access"has been corrected to"by accessing".3.Page 2,Line 3 in left column:The sentence"The CLS system was expected to exhibit limited experimental efficiency"has been corrected to"The CLS system exhibited limited experimental efficiency as expected".4.Page 3,Line 19 in left column:the$symbol should be removed.
基金supported by the National Natural Science Foundation of China(NSFC)(No.52075131)。
文摘A whispering gallery mode resonator(WGMR)filter can narrow laser linewidth while significantly changing the output power characteristics of fiber laser system.It is found that traditional laser output power model is invalid.We report a correction model of a narrow linewidth fiber laser filtered with a WGMR to analyze its power.We believe that the loss of the laser system and the threshold gain increase caused by the WGMR filter lead to the predominate amplified spontaneous emission during the original laser period.According to that,we assume the correction coefficient is an exponential decay related to the Er-doped fiber length in the large loss situation,and we verify it experimentally.As a result,the correction model is valid for WGMR-filtered fiber laser.
