腹腔镜手术切除是肾上腺肿瘤治疗的标准术式。后腹腔镜肾上腺肿瘤切除术与经腹膜入路相比具有优势,其可以更方便、直接地进入肾上腺。多项研究表明后腹腔镜肾上腺肿瘤切除术的难度与多种因素有关,肿瘤大小、患者性别、患者体重指数(body...腹腔镜手术切除是肾上腺肿瘤治疗的标准术式。后腹腔镜肾上腺肿瘤切除术与经腹膜入路相比具有优势,其可以更方便、直接地进入肾上腺。多项研究表明后腹腔镜肾上腺肿瘤切除术的难度与多种因素有关,肿瘤大小、患者性别、患者体重指数(body mass index,BMI)、患者肾体位肋脊间距离(12肋缘下与髂前上棘间距离)、肾上腺肿瘤与肾上极的位置关系、肾周黏连程度、肿瘤病理类型等均会影响手术难度。此外,术者的经验和技术水平也很大程度上影响着手术进程。展开更多
In order to quantitatively analyze air traffic operation complexity,multidimensional metrics were selected based on the operational characteristics of traffic flow.The kernel principal component analysis method was ut...In order to quantitatively analyze air traffic operation complexity,multidimensional metrics were selected based on the operational characteristics of traffic flow.The kernel principal component analysis method was utilized to reduce the dimensionality of metrics,therefore to extract crucial information in the metrics.The hierarchical clustering method was used to analyze the complexity of different airspace.Fourteen sectors of Guangzhou Area Control Center were taken as samples.The operation complexity of traffic situation in each sector was calculated based on real flight radar data.Clustering analysis verified the feasibility and rationality of the method,and provided a reference for airspace operation and management.展开更多
A criterion for whether a pure-state quantum channel consisting of 2n qubits averagely distributed between two nodes can be used for perfectly teleporting an arbitrary n-qubit state via Bell-state measurements is educ...A criterion for whether a pure-state quantum channel consisting of 2n qubits averagely distributed between two nodes can be used for perfectly teleporting an arbitrary n-qubit state via Bell-state measurements is educed.Specifically,a matrix is composed of the coefficients of the known channel state and whether the matrix is unitary decides the criterion.As the criterion is apparently different from the usual standard entanglement criterion (USEC),its applicability is enlarged and verified by other measuring bases.Thorough analyses have further simplified the resultant criterion,so that a much simpler criterion than the USEC is conclusively obtained.Moreover,the flexibility of operation complexity between the non-unitary measurements and the unitary reconstructions is explicitly exhibited.展开更多
文摘腹腔镜手术切除是肾上腺肿瘤治疗的标准术式。后腹腔镜肾上腺肿瘤切除术与经腹膜入路相比具有优势,其可以更方便、直接地进入肾上腺。多项研究表明后腹腔镜肾上腺肿瘤切除术的难度与多种因素有关,肿瘤大小、患者性别、患者体重指数(body mass index,BMI)、患者肾体位肋脊间距离(12肋缘下与髂前上棘间距离)、肾上腺肿瘤与肾上极的位置关系、肾周黏连程度、肿瘤病理类型等均会影响手术难度。此外,术者的经验和技术水平也很大程度上影响着手术进程。
基金co-supported by the National Natural Science Foundation of China(No.61304190)the Fundamental Research Funds for the Central Universities of China(No.NJ20150030)the Youth Science and Technology Innovation Fund(No.NS2014067)
文摘In order to quantitatively analyze air traffic operation complexity,multidimensional metrics were selected based on the operational characteristics of traffic flow.The kernel principal component analysis method was utilized to reduce the dimensionality of metrics,therefore to extract crucial information in the metrics.The hierarchical clustering method was used to analyze the complexity of different airspace.Fourteen sectors of Guangzhou Area Control Center were taken as samples.The operation complexity of traffic situation in each sector was calculated based on real flight radar data.Clustering analysis verified the feasibility and rationality of the method,and provided a reference for airspace operation and management.
基金supported by the Program for New Century Excellent Talents at the University of China (Grant No.NCET-06-0554)the National Natural Science Foundation of China (Grant Nos.10975001,60677001,10747146 and 10874122)+3 种基金the Science-Technology Fund of Anhui Province for Out-standing Youth (Grant No.06042087)the General Fund of the Educational Committee of Anhui Province (Grant No.2006KJ260B)the Natural Science Foundation of Guangdong Province (Grant Nos.06300345 and 7007806)the Talent Foundation of High Education of Anhui Province for Out-standing Youth (Grant No.2009SQRZ018)
文摘A criterion for whether a pure-state quantum channel consisting of 2n qubits averagely distributed between two nodes can be used for perfectly teleporting an arbitrary n-qubit state via Bell-state measurements is educed.Specifically,a matrix is composed of the coefficients of the known channel state and whether the matrix is unitary decides the criterion.As the criterion is apparently different from the usual standard entanglement criterion (USEC),its applicability is enlarged and verified by other measuring bases.Thorough analyses have further simplified the resultant criterion,so that a much simpler criterion than the USEC is conclusively obtained.Moreover,the flexibility of operation complexity between the non-unitary measurements and the unitary reconstructions is explicitly exhibited.
