A new method is presented for the segmentation of pulmonary parenchyma. The proposed method is based on the area calculation of different objects in the image. The main purpose of the proposed algorithm is the segment...A new method is presented for the segmentation of pulmonary parenchyma. The proposed method is based on the area calculation of different objects in the image. The main purpose of the proposed algorithm is the segment of the lungs images from the computer tomography(CT) images. The original image is binarized using the bit-plane slicing technique and among the different images the best binarized image is chosen. After binarization, the labeling is done and the area of each label is calculated from which the next level of binarized image is obtained. Then, the boundary tracing algorithm is applied to get another level of binarized image. The proposed method is able to extract lung region from the original images. The experimental results show the significance of the proposed method.展开更多
[Objective] The research aimed to study the application of chemical tracing experiment technique in leakage detection of hydraulic engineering.[Method] According to the current situation of Sanyuan Western Suburb Rese...[Objective] The research aimed to study the application of chemical tracing experiment technique in leakage detection of hydraulic engineering.[Method] According to the current situation of Sanyuan Western Suburb Reservoir in Xianyang City of Shaanxi Province,three sections （L1,L2 and L3） were set.KI was selected as the chemical tracer to carry out the tracing and detection research.[Result] There was no obvious leakage phenomenon in L1,L2 and L3 sections.The impermeability of rock in some dam abutments was bad.[Conclusion] The leakage reason of Western Suburb Reservoir was that the impermeability of rock in some dam abutments couldn’t satisfy seepage requirement.After the reservoir was put into operation,the water level in front of dam rose,and the ground water level of dam abutment also rose.The penetration water pressure correspondingly increased,and the water content of bank slope at the downstream of dam increased.展开更多
The new double projecting neurons were found in the cat spinal dorsal horn by the double retrograde fluorescent tracing technique.Fast Blue(FB)was injected into unilateral dorsal column nucleus(DCN)of adult cats anest...The new double projecting neurons were found in the cat spinal dorsal horn by the double retrograde fluorescent tracing technique.Fast Blue(FB)was injected into unilateral dorsal column nucleus(DCN)of adult cats anesthetized with pentobarbital.Nuclear Yellow(NY)was injected ipsilaterally into the lateral cervical nucleus(LCN)8-9 days later.After an additional 18-30 hrs.展开更多
Nonlinear solution of reinforced concrete structures, particularly complete load-deflection response, requires tracing of the equilibrium path and proper treatment of the limit and bifurcation points. In this regard, ...Nonlinear solution of reinforced concrete structures, particularly complete load-deflection response, requires tracing of the equilibrium path and proper treatment of the limit and bifurcation points. In this regard, ordinary solution techniques lead to instability near the limit points and also have problems in case of snap-through and snap-back. Thus they fail to predict the complete load-displacement response. The arc-length method serves the purpose well in principle, received wide acceptance in finite element analysis, and has been used extensively. However modifications to the basic idea are vital to meet the particular needs of the analysis. This paper reviews some of the recent developments of the method in the last two decades, with particular emphasis on nonlinear finite element analysis of reinforced concrete structures.展开更多
The surface-related multiple elimination(SRME) method is based on feedback formulation and has become one of the most preferred multiple suppression methods used. However, some differences are apparent between the pre...The surface-related multiple elimination(SRME) method is based on feedback formulation and has become one of the most preferred multiple suppression methods used. However, some differences are apparent between the predicted multiples and those in the source seismic records, which may result in conventional adaptive multiple subtraction methods being barely able to effectively suppress multiples in actual production. This paper introduces a combined adaptive multiple attenuation method based on the optimized event tracing technique and extended Wiener filtering. The method firstly uses multiple records predicted by SRME to generate a multiple velocity spectrum, then separates the original record to an approximate primary record and an approximate multiple record by applying the optimized event tracing method and short-time window FK filtering method. After applying the extended Wiener filtering method, residual multiples in the approximate primary record can then be eliminated and the damaged primary can be restored from the approximate multiple record. This method combines the advantages of multiple elimination based on the optimized event tracing method and the extended Wiener filtering technique. It is an ideal method for suppressing typical hyperbolic and other types of multiples, with the advantage of minimizing damage of the primary. Synthetic and field data tests show that this method produces better multiple elimination results than the traditional multi-channel Wiener filter method and is more suitable for multiple elimination in complicated geological areas.展开更多
Fluoro-ruby was injected into the posterior funiculus of the spinal cord in the cervical （C5-T2） and lumbar （L3-6） segments of adult guinea pigs. The spinal cord was cut into serial frozen sections. The Fluoro-rub...Fluoro-ruby was injected into the posterior funiculus of the spinal cord in the cervical （C5-T2） and lumbar （L3-6） segments of adult guinea pigs. The spinal cord was cut into serial frozen sections. The Fluoro-ruby labeling was clearly delineated from the surrounding structure. The labeling traversed the cervical, thoracic and lumbar segments, and was located on the ventral portion of the posterior funiculus on the injected side, proximal to the intermediate zone of the dorsal gray matter. The fluorescence area narrowed rostro-caudally. The spinal cord, spinal cord gray matter and corticospinal tract were reconstructed using 3D-DOCTOR 4.0 software, resulting in a robust three-dimensional profile. Using functionality provided by the reconstruction software, free multi-angle observation and sectioning could be conducted on the spinal cord and corticospinal tract. Our experimental findings indicate that the Fluoro-ruby retrograde fluorescent tracing technique can accurately display the anatomical location of corticospinal tract in the guinea pig and that three-dimensional reconstruction software can be used to provide a three-dimensional image of the corticospinal tract.展开更多
With the help of technique of integration within an ordered product of operators we can fully display the partial trace method to deduce some new density operators of light field. The general form of single-mode densi...With the help of technique of integration within an ordered product of operators we can fully display the partial trace method to deduce some new density operators of light field. The general form of single-mode density operator is derived in this way from a normalized two-mode generalized squeezed pure state density operator.展开更多
以五常、常熟和雅安水稻土为研究对象,通过室内泥浆培养,利用基于膜进样质谱仪(Membrane Inlet Mass Spectrometer,MIMS)的15N示踪技术,探究了温度、pH、NO_(3)^(–)浓度、C/N、Fe^(2+)和S2–浓度对三种水稻土反硝化和硝酸根异化还原成...以五常、常熟和雅安水稻土为研究对象,通过室内泥浆培养,利用基于膜进样质谱仪(Membrane Inlet Mass Spectrometer,MIMS)的15N示踪技术,探究了温度、pH、NO_(3)^(–)浓度、C/N、Fe^(2+)和S2–浓度对三种水稻土反硝化和硝酸根异化还原成铵(Dissimilatory nitrate reduction to ammonium,DNRA)速率及二者占硝酸根还原过程相对贡献的影响。结果表明,在所研究的稻田土壤中,反硝化是NO_(3)^(–)异化还原过程的主导途径,占比87.97%~91.73%,而DNRA仅占8.27%~12.03%。反硝化和DNRA速率随温度升高均呈指数增长,且DNRA占NO_(3)^(–)异化还原的比例(RDNRA)也随温度升高呈增长趋势。反硝化和DNRA速率分别在pH为7或者8.5时最高,相对于碱性环境(4.92%~14.67%),酸性环境中RDNRA(6.24%~15.56%)更高。反硝化和DNRA速率与NO_(3)^(–)浓度之间关系符合米氏方程,且反硝化的最大速率(Vmax)和米氏常数(Km)均大于DNRA。与未加碳源对照组相比,C/N为2.5时,反硝化速率显著提高了22%~35%;C/N大于2.5时,DNRA速率显著提高了74%~199%。三种土壤中,Fe^(2+)添加和S2–添加处理中呈现出类似的趋势,均在低浓度电子供体(即Fe^(2+)和S2–浓度分别为300~500μmol·L^(-1)和50~62.5μmol·L^(-1))时呈现出最高的反硝化速率,而DNRA速率达到峰值则需要更高浓度的电子供体(即Fe^(2+)和S2–浓度分别为800~1000μmol·L^(-1)和100~125μmol·L^(-1))。综上可知,环境因子可显著影响NO_(3)^(–)异化还原过程的速率及分配,其中高温、高C/N、高浓度Fe^(2+)和S2–有利于更多的NO_(3)^(–)分配给DNRA过程,而高浓度NO_(3)^(–)会提高NO_(3)^(–)向反硝化过程的分配。上述研究结果深化了对水稻土NO3–异化还原过程分配的认识,对于探寻潜在农学措施提高DNRA过程的分配比例,进而提高土壤中氮素的固持和提高稻田氮肥利用率具有重要的科学意义。展开更多
目的本研究旨在采用二维斑点示踪技术(2D-STE)评估2型糖尿病(T2DM)患者左心室应变功能,比较体重控制良好和体重控制不佳的糖尿病患者的左室功能差异以及与健康对照组的差异。方法选择2022年8月—2023年3月在本院内分泌科住院的98例2型...目的本研究旨在采用二维斑点示踪技术(2D-STE)评估2型糖尿病(T2DM)患者左心室应变功能,比较体重控制良好和体重控制不佳的糖尿病患者的左室功能差异以及与健康对照组的差异。方法选择2022年8月—2023年3月在本院内分泌科住院的98例2型糖尿病患者及39名体检正常的健康人作为研究对象,将98例T2DM患者按体重指数(BMI)分为A组(BMI≥24 kg m^(-2),50例)和B组(BMI<24 kg m^(-2),48例)两组,同时将39名健康正常人作为健康对照组记为C组(其左室射血分数LVEF≥55%)。采用常规超声心动图测量常规心脏数据同时采用二维斑点示踪技术(2D-STE)获得左室心尖四腔、三腔、两腔二维动态图像,统计出左室基底段、中间段、心尖段各节段纵向应变值及左室整体纵向应变值和左室前间壁、前壁、前侧壁、下侧壁、下壁、下间壁各侧壁纵向应变值,并比较这些数据在三组之间的差异性。分析左室整体纵向应变值与BMI之间的相关性。任意选取16例患者重新检查检验观察者内与观察者间的可重复性。结果三组患者的LAd、LVd、LVPW S'、E/e'值比较,差异无统计学意义(P>0.05);A组和B组患者的LVEF、IVS S'值比C组明显降低,且A组患者的LVEF、IVS S'值低于B组,差异具有统计学意义(P<0.05);A组和B组患者的左室基底段、中间段、心尖段及整体纵向应变值比C组明显降低,且A组患者的左室基底段、中间段、心尖段及整体纵向应变值低于B组,差异具有统计学意义(P<0.05);A组和B组患者的左室前间壁、前壁、前侧壁、下侧壁、下壁、下间壁纵向应变值比C组明显降低,且A组患者的左室前间壁、前壁、前侧壁、下侧壁、下壁、下间壁纵向应变值低于B组,差异具有统计学意义(P<0.05)。Pearson相关性分析表明,左室整体纵向应变值与BMI呈显著负相关,差异具有统计学意义。Bland-Altman分析显示,随机选取的16例患者左室基底段、中间段、心尖段纵向应变值测量散点值绝大多数处于95%一致性界限范围内,提示在观察者内与观察者间表现出较好的重复性。结论本研究表明体重控制不佳糖尿病组左室整体纵向应变值较体重控制良好糖尿病组及健康对照组改变明显,提示临床医生有必要对2型糖尿病患者的体重进行监管,特别是那些体重控制不良的患者,应加强心脏功能的监测和管理,防止病程发展演变到糖尿病心脏病,并为临床治疗提供参考依据。展开更多
基金supported (in part) by research funding from Chosun University, Korea, 2013
文摘A new method is presented for the segmentation of pulmonary parenchyma. The proposed method is based on the area calculation of different objects in the image. The main purpose of the proposed algorithm is the segment of the lungs images from the computer tomography(CT) images. The original image is binarized using the bit-plane slicing technique and among the different images the best binarized image is chosen. After binarization, the labeling is done and the area of each label is calculated from which the next level of binarized image is obtained. Then, the boundary tracing algorithm is applied to get another level of binarized image. The proposed method is able to extract lung region from the original images. The experimental results show the significance of the proposed method.
文摘[Objective] The research aimed to study the application of chemical tracing experiment technique in leakage detection of hydraulic engineering.[Method] According to the current situation of Sanyuan Western Suburb Reservoir in Xianyang City of Shaanxi Province,three sections （L1,L2 and L3） were set.KI was selected as the chemical tracer to carry out the tracing and detection research.[Result] There was no obvious leakage phenomenon in L1,L2 and L3 sections.The impermeability of rock in some dam abutments was bad.[Conclusion] The leakage reason of Western Suburb Reservoir was that the impermeability of rock in some dam abutments couldn’t satisfy seepage requirement.After the reservoir was put into operation,the water level in front of dam rose,and the ground water level of dam abutment also rose.The penetration water pressure correspondingly increased,and the water content of bank slope at the downstream of dam increased.
文摘The new double projecting neurons were found in the cat spinal dorsal horn by the double retrograde fluorescent tracing technique.Fast Blue(FB)was injected into unilateral dorsal column nucleus(DCN)of adult cats anesthetized with pentobarbital.Nuclear Yellow(NY)was injected ipsilaterally into the lateral cervical nucleus(LCN)8-9 days later.After an additional 18-30 hrs.
文摘Nonlinear solution of reinforced concrete structures, particularly complete load-deflection response, requires tracing of the equilibrium path and proper treatment of the limit and bifurcation points. In this regard, ordinary solution techniques lead to instability near the limit points and also have problems in case of snap-through and snap-back. Thus they fail to predict the complete load-displacement response. The arc-length method serves the purpose well in principle, received wide acceptance in finite element analysis, and has been used extensively. However modifications to the basic idea are vital to meet the particular needs of the analysis. This paper reviews some of the recent developments of the method in the last two decades, with particular emphasis on nonlinear finite element analysis of reinforced concrete structures.
基金support of the National Natural Science Fundation of China (Nos. 41574105 and 41674118)the National Science and Technology Major Project of China (No. 2016ZX05027-002)the Scientific and Technological Innovation Project financially supported by Qingdao National Laboratory for Marine Science and Technology (No. 2015ASKJ03)
文摘The surface-related multiple elimination(SRME) method is based on feedback formulation and has become one of the most preferred multiple suppression methods used. However, some differences are apparent between the predicted multiples and those in the source seismic records, which may result in conventional adaptive multiple subtraction methods being barely able to effectively suppress multiples in actual production. This paper introduces a combined adaptive multiple attenuation method based on the optimized event tracing technique and extended Wiener filtering. The method firstly uses multiple records predicted by SRME to generate a multiple velocity spectrum, then separates the original record to an approximate primary record and an approximate multiple record by applying the optimized event tracing method and short-time window FK filtering method. After applying the extended Wiener filtering method, residual multiples in the approximate primary record can then be eliminated and the damaged primary can be restored from the approximate multiple record. This method combines the advantages of multiple elimination based on the optimized event tracing method and the extended Wiener filtering technique. It is an ideal method for suppressing typical hyperbolic and other types of multiples, with the advantage of minimizing damage of the primary. Synthetic and field data tests show that this method produces better multiple elimination results than the traditional multi-channel Wiener filter method and is more suitable for multiple elimination in complicated geological areas.
基金supported by a grant from the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘Fluoro-ruby was injected into the posterior funiculus of the spinal cord in the cervical （C5-T2） and lumbar （L3-6） segments of adult guinea pigs. The spinal cord was cut into serial frozen sections. The Fluoro-ruby labeling was clearly delineated from the surrounding structure. The labeling traversed the cervical, thoracic and lumbar segments, and was located on the ventral portion of the posterior funiculus on the injected side, proximal to the intermediate zone of the dorsal gray matter. The fluorescence area narrowed rostro-caudally. The spinal cord, spinal cord gray matter and corticospinal tract were reconstructed using 3D-DOCTOR 4.0 software, resulting in a robust three-dimensional profile. Using functionality provided by the reconstruction software, free multi-angle observation and sectioning could be conducted on the spinal cord and corticospinal tract. Our experimental findings indicate that the Fluoro-ruby retrograde fluorescent tracing technique can accurately display the anatomical location of corticospinal tract in the guinea pig and that three-dimensional reconstruction software can be used to provide a three-dimensional image of the corticospinal tract.
基金Supported by the President Foundation of Chinese Academy of Science and National Natural Science Foundation of China under Grant Nos.10775097 and 10874174
文摘With the help of technique of integration within an ordered product of operators we can fully display the partial trace method to deduce some new density operators of light field. The general form of single-mode density operator is derived in this way from a normalized two-mode generalized squeezed pure state density operator.
文摘以五常、常熟和雅安水稻土为研究对象,通过室内泥浆培养,利用基于膜进样质谱仪(Membrane Inlet Mass Spectrometer,MIMS)的15N示踪技术,探究了温度、pH、NO_(3)^(–)浓度、C/N、Fe^(2+)和S2–浓度对三种水稻土反硝化和硝酸根异化还原成铵(Dissimilatory nitrate reduction to ammonium,DNRA)速率及二者占硝酸根还原过程相对贡献的影响。结果表明,在所研究的稻田土壤中,反硝化是NO_(3)^(–)异化还原过程的主导途径,占比87.97%~91.73%,而DNRA仅占8.27%~12.03%。反硝化和DNRA速率随温度升高均呈指数增长,且DNRA占NO_(3)^(–)异化还原的比例(RDNRA)也随温度升高呈增长趋势。反硝化和DNRA速率分别在pH为7或者8.5时最高,相对于碱性环境(4.92%~14.67%),酸性环境中RDNRA(6.24%~15.56%)更高。反硝化和DNRA速率与NO_(3)^(–)浓度之间关系符合米氏方程,且反硝化的最大速率(Vmax)和米氏常数(Km)均大于DNRA。与未加碳源对照组相比,C/N为2.5时,反硝化速率显著提高了22%~35%;C/N大于2.5时,DNRA速率显著提高了74%~199%。三种土壤中,Fe^(2+)添加和S2–添加处理中呈现出类似的趋势,均在低浓度电子供体(即Fe^(2+)和S2–浓度分别为300~500μmol·L^(-1)和50~62.5μmol·L^(-1))时呈现出最高的反硝化速率,而DNRA速率达到峰值则需要更高浓度的电子供体(即Fe^(2+)和S2–浓度分别为800~1000μmol·L^(-1)和100~125μmol·L^(-1))。综上可知,环境因子可显著影响NO_(3)^(–)异化还原过程的速率及分配,其中高温、高C/N、高浓度Fe^(2+)和S2–有利于更多的NO_(3)^(–)分配给DNRA过程,而高浓度NO_(3)^(–)会提高NO_(3)^(–)向反硝化过程的分配。上述研究结果深化了对水稻土NO3–异化还原过程分配的认识,对于探寻潜在农学措施提高DNRA过程的分配比例,进而提高土壤中氮素的固持和提高稻田氮肥利用率具有重要的科学意义。
文摘目的本研究旨在采用二维斑点示踪技术(2D-STE)评估2型糖尿病(T2DM)患者左心室应变功能,比较体重控制良好和体重控制不佳的糖尿病患者的左室功能差异以及与健康对照组的差异。方法选择2022年8月—2023年3月在本院内分泌科住院的98例2型糖尿病患者及39名体检正常的健康人作为研究对象,将98例T2DM患者按体重指数(BMI)分为A组(BMI≥24 kg m^(-2),50例)和B组(BMI<24 kg m^(-2),48例)两组,同时将39名健康正常人作为健康对照组记为C组(其左室射血分数LVEF≥55%)。采用常规超声心动图测量常规心脏数据同时采用二维斑点示踪技术(2D-STE)获得左室心尖四腔、三腔、两腔二维动态图像,统计出左室基底段、中间段、心尖段各节段纵向应变值及左室整体纵向应变值和左室前间壁、前壁、前侧壁、下侧壁、下壁、下间壁各侧壁纵向应变值,并比较这些数据在三组之间的差异性。分析左室整体纵向应变值与BMI之间的相关性。任意选取16例患者重新检查检验观察者内与观察者间的可重复性。结果三组患者的LAd、LVd、LVPW S'、E/e'值比较,差异无统计学意义(P>0.05);A组和B组患者的LVEF、IVS S'值比C组明显降低,且A组患者的LVEF、IVS S'值低于B组,差异具有统计学意义(P<0.05);A组和B组患者的左室基底段、中间段、心尖段及整体纵向应变值比C组明显降低,且A组患者的左室基底段、中间段、心尖段及整体纵向应变值低于B组,差异具有统计学意义(P<0.05);A组和B组患者的左室前间壁、前壁、前侧壁、下侧壁、下壁、下间壁纵向应变值比C组明显降低,且A组患者的左室前间壁、前壁、前侧壁、下侧壁、下壁、下间壁纵向应变值低于B组,差异具有统计学意义(P<0.05)。Pearson相关性分析表明,左室整体纵向应变值与BMI呈显著负相关,差异具有统计学意义。Bland-Altman分析显示,随机选取的16例患者左室基底段、中间段、心尖段纵向应变值测量散点值绝大多数处于95%一致性界限范围内,提示在观察者内与观察者间表现出较好的重复性。结论本研究表明体重控制不佳糖尿病组左室整体纵向应变值较体重控制良好糖尿病组及健康对照组改变明显,提示临床医生有必要对2型糖尿病患者的体重进行监管,特别是那些体重控制不良的患者,应加强心脏功能的监测和管理,防止病程发展演变到糖尿病心脏病,并为临床治疗提供参考依据。
