Considering the transverse inertia effect of pile, the vertical soil layer is studied. The wave propagations in the outer and inner soil dynamic response of a large diameter pipe pile in viscoelastic are simulated by ...Considering the transverse inertia effect of pile, the vertical soil layer is studied. The wave propagations in the outer and inner soil dynamic response of a large diameter pipe pile in viscoelastic are simulated by three-dimensional elastodynamic theory and those in the pile are simulated by Rayleigh-Love rod theory. The vertical and radial displacements of the outer and inner soil are obtained by utilizing Laplace transform technique and differentiation on the governing equations of soils. Then, based on the continuous conditions between the pile and soils, the displacements of the pile are derived. The frequency domain velocity admittance and time domain velocity response of the pile top are also presented. The solution is compared to a classical rod model solution to verify the validity. The influences of the radii and Poisson ratio of pile on the transverse inertia effect of pile are analyzed. The parametric study shows that Poisson ratio and outer radius of pile have significant influence on the transverse inertia effect of large diameter pipe piles, while the inner radius has little effect.展开更多
<strong>Background:</strong> Measuring optic nerve sheath diameter (ONSD), a relatively re-cent technique, allows an indirect and non-invasive diagnosis of intracranial hypertension. The ONSD ratio to eyeb...<strong>Background:</strong> Measuring optic nerve sheath diameter (ONSD), a relatively re-cent technique, allows an indirect and non-invasive diagnosis of intracranial hypertension. The ONSD ratio to eyeball transverse diameter (ETD) increases this reliability of the technique. The objective of this study was to determine the normal ONSD and its ratio with ETD in black African adults in Benin. <strong>Methods:</strong> A descriptive cross-sectional study was conducted between May 2019 and August 2019. Ultrasound ONSD and ONSD/ETD ratio were meas-ured in 210 healthy adults received in the medical imaging department of the Borgou and Alibori University Hospital Center in Benin. The ONSD corre-sponded to the average of 12 measurements (03 horizontal and 03 vertical for each eye) taken 3 mm behind the papilla. The transverse ETD corresponded to the average of 03 measurements. <strong>Results:</strong> The mean ONSD was 4.20 ± 0.28 mm (95% CI = [4.17;4.24] mm and 95th percentile = 4.70 mm). The mean ETD was 24.25 ± 1.10 mm. The ONSD/ETD ratio was 0.17 ± 0.01 (95% CI = [0.17;0.17] and 95th percentile = 0.19). There was no difference between ver-tical and horizontal ONSD and between right and left ONSD. The ONSD and the ONSD/ETD ratio were not correlated with any of the socio-demographic and anthropometric characteristics studied (sex, age, ethnicity, weight, height, body mass index, head circumference and waist circumference). The ONSD was associated with ETD (p < 0.001 and r = 0.55). <strong>Conclusion:</strong> An ONSD and an ONSD/ETD ratio respectively greater than 4.70 mm and 0.19 should sus-pect intracranial hypertension. The ONSD/ETD ratio may be a better indicator of HICT because of its small variation.展开更多
BACKGROUND Optic nerve sheath diameter(ONSD)measurement is one of the non-invasive methods recommended for increased intracranial pressure(ICP)monitoring.AIM This study aimed to evaluate the roles of optic nerve sheat...BACKGROUND Optic nerve sheath diameter(ONSD)measurement is one of the non-invasive methods recommended for increased intracranial pressure(ICP)monitoring.AIM This study aimed to evaluate the roles of optic nerve sheath diameter(ONSD)and ONSD/eyeball transverse diameter(ETD)ratio in predicting prognosis of death in comatose patients with acute stroke during their hospitalization.METHODS A total of 67 comatose patients with acute stroke were retrospectively recruited.The ONSD and ETD were measured by cranial computed tomography(CT)scan.All patients underwent cranial CT scan within 24 h after coma onset.Patients were divided into death group and survival group according to their survival status at discharge.The differences of the ONSD and ONSD/ETD ratio between the two groups and their prognostic values were compared.RESULTS The ONSD and ONSD/ETD ratio were 6.07±0.72 mm and 0.27±0.03 in the comatose patients,respectively.The ONSD was significantly greater in the death group than that in the survival group(6.32±0.67 mm vs 5.65±0.62 mm,t=4.078,P<0.0001).The ONSD/ETD ratio was significantly higher in the death group than that in the survival group(0.28±0.03 vs 0.25±0.02,t=4.625,P<0.0001).The area under the receiver operating characteristic curve was 0.760(95%CI:0.637-0.882,P<0.0001)for the ONSD and 0.808(95%CI:0.696-0.920,P<0.0001)for the ONSD/ETD ratio.CONCLUSION The mortality increased in comatose patients with acute stroke when the ONSD was>5.7 mm or the ONSD/ETD ratio was>0.25.Both indexes could be used as prognostic tools for comatose patients with acute stroke.The ONSD/ETD ratio was more stable than the ONSD alone,which would be preferred in clinical practice.展开更多
The aim of this study was to characterize the changes in berry anatomy during the development of grape(Vitis vinifera L.,and Vitis vinifera×Vitis labrusca)with different shapes.Paraffin sectioning was used to exa...The aim of this study was to characterize the changes in berry anatomy during the development of grape(Vitis vinifera L.,and Vitis vinifera×Vitis labrusca)with different shapes.Paraffin sectioning was used to examine the structural parameters of the cells.The results revealed that,with the development of berries,the transverse and longitudinal diameters of the flesh cells gradually increased,revealing certain regularity.However,the transverse and longitudinal diameters of the epidermal and sub-epidermal cells were different between varieties,reflecting the specificity of the varieties.The growth of the transverse and longitudinal diameters of the berries was found to be completed in the early stage of development.A combination of correlation analysis and size analysis for each cell layer revealed that,due to the small crosssectional area of the epidermal and sub-epidermal cells,the influence of these cells on the transverse and the longitudinal diameters of the berries would be small.In conclusion,the longitudinal and transverse diameters of the grape berries were mainly determined by the longitudinal and transverse diameters of the flesh cells.The different shapes of the grape berries could mainly be attributed to the different growth rates of the flesh cells in the longitudinal and transverse directions.These different rates of growth led to different lengths and widths of the berry.展开更多
BACKGROUND Anastomotic leakage(AL)is a fatal complication in patients with rectal cancer after undergoing anterior resection.However,the role of abdominal composition in the development of AL has not been studied.AIM ...BACKGROUND Anastomotic leakage(AL)is a fatal complication in patients with rectal cancer after undergoing anterior resection.However,the role of abdominal composition in the development of AL has not been studied.AIM To investigate the relationship between abdominal composition and AL in rectal cancer patients after undergoing anterior resection.METHODS A retrospective case-matched cohort study was conducted.Complete data for 78 patients with AL were acquired and this cohort was defined as the AL group.The controls were matched for the same sex and body mass index(±1 kg/m^(2)).Parameters related to abdominal composition including visceral fat area(VFA),subcutaneous fat area(SFA),subcutaneous fat thickness(SFT),skeletal muscle area(SMA),skeletal muscle index(SMI),abdominal circumference(AC),anterior to posterior diameter of abdominal cavity(APD),and transverse diameter of abdominal cavity(TD)were evaluated based on computed tomography(CT)images using the following Hounsfield Unit(HU)thresholds:SFA:-190 to-30,SMA:-29 to 150,and VFA:-150 to-20.The significance of abdominal compositionrelated parameters was quantified using feature importance analysis;an artificial intelligence method was used to evaluate the contribution of each included variable.RESULTS Two thousand two hundred and thirty-eight rectal cancer patients who underwent anterior resection from 2010 to 2020 in a large academic hospital were investigated.Finally,156 cases were enrolled in the study.Patients in the AL group showed longer operative time(225.03±55.29 vs 207.17±40.80,P=0.023),lower levels of preoperative hemoglobin(123.32±21.17 vs 132.60±16.31,P=0.003)and albumin(38.34±4.01 vs 40.52±3.97,P=0.001),larger tumor size(4.07±1.36 vs 2.76±1.28,P<0.001),and later cancer stage(P<0.001)compared to the controls.Patients who developed AL exhibited a larger VFA(125.68±73.59 vs 97.03±57.66,P=0.008)and a smaller APD(77.30±23.23 vs 92.09±26.40,P<0.001)and TD(22.90±2.23 vs 24.21±2.90,P=0.002)compared to their matched controls.Feature importance analysis revealed that TD,APD,and VFA were the three most important abdominal composition-related features.CONCLUSION AL patients have a higher visceral fat content and a narrower abdominal structure compared to matched controls.展开更多
基金Project(U1134207)jointly supported by the National Natural Science Foundation and High Speed Railway Key Program of ChinaProject(NCET-12-0843)supported by the Program for New Century Excellent Talents in University of China+1 种基金Projects(51378177,51420105013)supported by the National Natural Science Foundation of ChinaProjects(2015B05014,2014B02814)supported by the Fundamental Research Funds for the Central Universities,China
文摘Considering the transverse inertia effect of pile, the vertical soil layer is studied. The wave propagations in the outer and inner soil dynamic response of a large diameter pipe pile in viscoelastic are simulated by three-dimensional elastodynamic theory and those in the pile are simulated by Rayleigh-Love rod theory. The vertical and radial displacements of the outer and inner soil are obtained by utilizing Laplace transform technique and differentiation on the governing equations of soils. Then, based on the continuous conditions between the pile and soils, the displacements of the pile are derived. The frequency domain velocity admittance and time domain velocity response of the pile top are also presented. The solution is compared to a classical rod model solution to verify the validity. The influences of the radii and Poisson ratio of pile on the transverse inertia effect of pile are analyzed. The parametric study shows that Poisson ratio and outer radius of pile have significant influence on the transverse inertia effect of large diameter pipe piles, while the inner radius has little effect.
文摘<strong>Background:</strong> Measuring optic nerve sheath diameter (ONSD), a relatively re-cent technique, allows an indirect and non-invasive diagnosis of intracranial hypertension. The ONSD ratio to eyeball transverse diameter (ETD) increases this reliability of the technique. The objective of this study was to determine the normal ONSD and its ratio with ETD in black African adults in Benin. <strong>Methods:</strong> A descriptive cross-sectional study was conducted between May 2019 and August 2019. Ultrasound ONSD and ONSD/ETD ratio were meas-ured in 210 healthy adults received in the medical imaging department of the Borgou and Alibori University Hospital Center in Benin. The ONSD corre-sponded to the average of 12 measurements (03 horizontal and 03 vertical for each eye) taken 3 mm behind the papilla. The transverse ETD corresponded to the average of 03 measurements. <strong>Results:</strong> The mean ONSD was 4.20 ± 0.28 mm (95% CI = [4.17;4.24] mm and 95th percentile = 4.70 mm). The mean ETD was 24.25 ± 1.10 mm. The ONSD/ETD ratio was 0.17 ± 0.01 (95% CI = [0.17;0.17] and 95th percentile = 0.19). There was no difference between ver-tical and horizontal ONSD and between right and left ONSD. The ONSD and the ONSD/ETD ratio were not correlated with any of the socio-demographic and anthropometric characteristics studied (sex, age, ethnicity, weight, height, body mass index, head circumference and waist circumference). The ONSD was associated with ETD (p < 0.001 and r = 0.55). <strong>Conclusion:</strong> An ONSD and an ONSD/ETD ratio respectively greater than 4.70 mm and 0.19 should sus-pect intracranial hypertension. The ONSD/ETD ratio may be a better indicator of HICT because of its small variation.
文摘BACKGROUND Optic nerve sheath diameter(ONSD)measurement is one of the non-invasive methods recommended for increased intracranial pressure(ICP)monitoring.AIM This study aimed to evaluate the roles of optic nerve sheath diameter(ONSD)and ONSD/eyeball transverse diameter(ETD)ratio in predicting prognosis of death in comatose patients with acute stroke during their hospitalization.METHODS A total of 67 comatose patients with acute stroke were retrospectively recruited.The ONSD and ETD were measured by cranial computed tomography(CT)scan.All patients underwent cranial CT scan within 24 h after coma onset.Patients were divided into death group and survival group according to their survival status at discharge.The differences of the ONSD and ONSD/ETD ratio between the two groups and their prognostic values were compared.RESULTS The ONSD and ONSD/ETD ratio were 6.07±0.72 mm and 0.27±0.03 in the comatose patients,respectively.The ONSD was significantly greater in the death group than that in the survival group(6.32±0.67 mm vs 5.65±0.62 mm,t=4.078,P<0.0001).The ONSD/ETD ratio was significantly higher in the death group than that in the survival group(0.28±0.03 vs 0.25±0.02,t=4.625,P<0.0001).The area under the receiver operating characteristic curve was 0.760(95%CI:0.637-0.882,P<0.0001)for the ONSD and 0.808(95%CI:0.696-0.920,P<0.0001)for the ONSD/ETD ratio.CONCLUSION The mortality increased in comatose patients with acute stroke when the ONSD was>5.7 mm or the ONSD/ETD ratio was>0.25.Both indexes could be used as prognostic tools for comatose patients with acute stroke.The ONSD/ETD ratio was more stable than the ONSD alone,which would be preferred in clinical practice.
基金The authors are grateful for the National Key Research and Development Program(Grant No.2019YFD1000101)the financial support from the National Natural Science Foundation Project(Grant Nos.31672131 and 31372027)+1 种基金China Agriculture Research System(Grant No.CARS-29)and the Agricultural Science and Technology Innovation Program(Grant No.CAAS-ASTIP-2018-ZFRI).
文摘The aim of this study was to characterize the changes in berry anatomy during the development of grape(Vitis vinifera L.,and Vitis vinifera×Vitis labrusca)with different shapes.Paraffin sectioning was used to examine the structural parameters of the cells.The results revealed that,with the development of berries,the transverse and longitudinal diameters of the flesh cells gradually increased,revealing certain regularity.However,the transverse and longitudinal diameters of the epidermal and sub-epidermal cells were different between varieties,reflecting the specificity of the varieties.The growth of the transverse and longitudinal diameters of the berries was found to be completed in the early stage of development.A combination of correlation analysis and size analysis for each cell layer revealed that,due to the small crosssectional area of the epidermal and sub-epidermal cells,the influence of these cells on the transverse and the longitudinal diameters of the berries would be small.In conclusion,the longitudinal and transverse diameters of the grape berries were mainly determined by the longitudinal and transverse diameters of the flesh cells.The different shapes of the grape berries could mainly be attributed to the different growth rates of the flesh cells in the longitudinal and transverse directions.These different rates of growth led to different lengths and widths of the berry.
基金by the Local Ethical Committee of Tongji Hospital of Huazhong University of Science and Technology(Approval No.TJ-IRB20210719).
文摘BACKGROUND Anastomotic leakage(AL)is a fatal complication in patients with rectal cancer after undergoing anterior resection.However,the role of abdominal composition in the development of AL has not been studied.AIM To investigate the relationship between abdominal composition and AL in rectal cancer patients after undergoing anterior resection.METHODS A retrospective case-matched cohort study was conducted.Complete data for 78 patients with AL were acquired and this cohort was defined as the AL group.The controls were matched for the same sex and body mass index(±1 kg/m^(2)).Parameters related to abdominal composition including visceral fat area(VFA),subcutaneous fat area(SFA),subcutaneous fat thickness(SFT),skeletal muscle area(SMA),skeletal muscle index(SMI),abdominal circumference(AC),anterior to posterior diameter of abdominal cavity(APD),and transverse diameter of abdominal cavity(TD)were evaluated based on computed tomography(CT)images using the following Hounsfield Unit(HU)thresholds:SFA:-190 to-30,SMA:-29 to 150,and VFA:-150 to-20.The significance of abdominal compositionrelated parameters was quantified using feature importance analysis;an artificial intelligence method was used to evaluate the contribution of each included variable.RESULTS Two thousand two hundred and thirty-eight rectal cancer patients who underwent anterior resection from 2010 to 2020 in a large academic hospital were investigated.Finally,156 cases were enrolled in the study.Patients in the AL group showed longer operative time(225.03±55.29 vs 207.17±40.80,P=0.023),lower levels of preoperative hemoglobin(123.32±21.17 vs 132.60±16.31,P=0.003)and albumin(38.34±4.01 vs 40.52±3.97,P=0.001),larger tumor size(4.07±1.36 vs 2.76±1.28,P<0.001),and later cancer stage(P<0.001)compared to the controls.Patients who developed AL exhibited a larger VFA(125.68±73.59 vs 97.03±57.66,P=0.008)and a smaller APD(77.30±23.23 vs 92.09±26.40,P<0.001)and TD(22.90±2.23 vs 24.21±2.90,P=0.002)compared to their matched controls.Feature importance analysis revealed that TD,APD,and VFA were the three most important abdominal composition-related features.CONCLUSION AL patients have a higher visceral fat content and a narrower abdominal structure compared to matched controls.
