Nanjing University of Science and Technology

About: Nanjing University of Science and Technology is a education organization based out in Nanjing, China. It is known for research contribution in the topics: Catalysis & Computer science. The organization has 31581 authors who have published 36390 publications receiving 525474 citations. The organization is also known as: Nánjīng Lǐgōng Dàxué & Nánlǐgōng.

Fuzzy c-means clustering with weighted image patch for image segmentation

Abstract: Fuzzy c-means (FCM) clustering has been widely used in image segmentation. However, in spite of its computational efficiency and wide-spread prevalence, the FCM algorithm does not take the spatial information of pixels into consideration, and hence may result in low robustness to noise and less accurate segmentation. In this paper, we propose the weighted image patch-based FCM (WIPFCM) algorithm for image segmentation. In this algorithm, we use image patches to replace pixels in the fuzzy clustering, and construct a weighting scheme to able the pixels in each image patch to have anisotropic weights. Thus, the proposed algorithm incorporates local spatial information embedded in the image into the segmentation process, and hence improve its robustness to noise. We compared the novel algorithm to several state-of-the-art segmentation approaches in synthetic images and clinical brain MR studies. Our results show that the proposed WIPFCM algorithm can effectively overcome the impact of noise and substantially improve the accuracy of image segmentations.

Two-dimensional BX (X = P, As, Sb) semiconductors with mobilities approaching graphene.

Abstract: Carrier mobility plays a key role in the performance of microelectronic devices, especially the field effect transistors (FET). To design next generation two-dimensional (2D) FET, stable channel materials with a higher carrier mobility than silicon and a significant band gap are highly desirable, but are still not discovered. Here, we report a group of 2D materials of BX (X = P, As, and Sb), which are semiconducting with an ultrahigh carrier mobility. Using first-principles calculations, we find that all BX configurations are similar to graphene, but possess direct bandgaps of 1.36, 1.14, and 0.49 eV, respectively. Based on deformation potential theory, BX monolayers are predicted to have superior mobilities (>10(4) cm(2) V(-1) s(-1)) to phosphorene. In particular, the electron mobility of monolayer BSb is 3.2 × 10(5) cm(2) V(-1) s(-1), approaching the figure of merit in graphene (∼3 × 10(5) cm(2) V(-1) s(-1)). These results demonstrate that BX monolayers are of paramount significance for next-generation 2D FET manufacture.

Noninterferometric single-shot quantitative phase microscopy

Abstract: We present a noninterferometric single-shot quantitative phase microscopy technique with the use of the transport of intensity equation (TIE). The optical configuration is based on a Michelson-like architecture attached to a nonmodified inverted transmission bright field microscope. Two laterally separated images from different focal planes can be obtained simultaneously by a single camera exposure, enabling the TIE phase recovery to be performed at frame rates that are only camera limited. Precise measurement of a microlens array validates the principle and demonstrates the accuracy of the method. Investigations of chemical-induced apoptosis and the phagocytosis process of macrophages are then presented, suggesting that the method developed can provide promising applications in the dynamic study of cellular processes.