The combinatorial complexities of (1) the Voronoi diagram of moving points in 2D and (2) the Voronoi diagram of lines in 3D, both under the Euclidean metric, continues to challenge geometers because of the open gap between the (n2) lower bound and the O(n3+ε) upper bound. Each of these two combinatorial problems has a closely related problem involving Minkowski sums: (1′) the complexity of a Mi...

OBJECTIVE Mediastinal lymph node metastasis (N2) is a key prognostic factor for lung carcinoma. This study was undertaken to investigate the relationship between vascular endothelial growth factor C (VEGF-C) expression and postoperative early recurrence in patients with N2 non-small-cell lung cancer. METHODS Cancer tissue samples from 92 patients with pN2 non-small-cell lung cancer and benign...

In order to discover the advantages and disadvantages of different fertilization regimes and identify the best management practice of fertilization in greenhouse fields, soil enzyme activities involved in carbon (C) transformations, soil chemical characteristics, and crop yields were monitored after long-term (20-year) fertilization regimes, including no fertilizer (CK), 300 kg N ha-1 and 600 k...

The cutting properties of tools can be greatly improved by AlCrSiN coatings. The AlCrSiN coatings with nitrogen content in the range of 28.2–56.3 at. % were prepared by varying the N2/Ar flow ratio from 1/4 to 1/1. The influence of N2/Ar flow ratio on composition, microstructure, and mechanical properties, as well as the tribological properties, of the coatings was investigated. With increasing...

In this paper, the achievable DoF of MIMO X channels for constant channel coefficients with Mt antennas at transmitter t and Nr antennas at receiver r (t, r = 1, 2) is studied. A spatial interference alignment and cancelation scheme is proposed to achieve the maximum DoF of the MIMO X channels. The scenario of M1 ≥ M2 ≥ N1 ≥ N2 is first considered and divided into 3 cases, 3N2 < M1+M2 < 2N1+N2 ...

Samples were selected at two different times. At first sampling, populations were from staff nurses who were just classified as N1, N2, N3 and N4 level according to the clinical ladder system. Samples were randomly selected from N1 and N2, N3 level subjects and N4 subjects were all selected as samples. Sample sizes were 416, and 321 questionnaires returned were usable. At second sampling, popul...

in order to study the effect of salinity stress and nitrogen forms on nitrogen remobilization from root to shoot following defoliation and shoot dry matter production, a research in the form of factorial experiment based on randomized block, was designed in three replications. treatments include: 1) nitrogen forms containing a) biological n fixation (n1), b) 6mm nh4no3(n2), c) biological n fixa...