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排序方式: 共有451条查询结果,搜索用时 281 毫秒
1.
Kevin Heritage Ben Bryant Laura A. Fenner Andrew S. Wills Gabriel Aeppli Yeong‐Ah Soh 《Advanced functional materials》2020,30(36)
First‐order phase transitions, where one phase replaces another by virtue of a simple crossing of free energies, are best known between solids, liquids, and vapors, but they also occur in a wide range of other contexts, including even elemental magnets. The key challenges are to establish whether a phase transition is indeed first order, and then to determine how the new phase emerges because this will determine thermodynamic and electronic properties. Here it is shown that both challenges are met for the spin reorientation transition in the topological metallic ferromagnet Fe3Sn2. The magnetometry and variable temperature magnetic force microscopy experiments reveal that, analogous to the liquid–gas transition in the temperature–pressure plane, this transition is centered on a first‐order line terminating in a critical end point in the field‐temperature plane. The nucleation and growth associated with the transition is directly imaged, indicating that the new phase emerges at the most convoluted magnetic domain walls for the high temperature phase and then moves to self‐organize at the domain centers of the high temperature phase. The dense domain patterns and phase coexistence imply a complex inhomogenous electronic structure, which can yield anomalous contributions to the electrical conductivity. 相似文献
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Y. C. Soh 《International journal of control》2013,86(6):1851-1859
We extend the result of Soh to study the zeros of an entire family of polytope polynomials. We show that, under some conditions, zeros of the family of polynomials can be inferred from the zero locations of the vertex polynomials. 相似文献
6.
C. B. Soh 《International journal of systems science》2013,44(12):1563-1571
This paper derives necessary and sufficient conditions for periodic hybrid interval systems where the A, B and C system matrices are interval matrices to be controllable and observable. The results are easily extended to impulsive periodic hybrid interval systems and linear discrete-time systems. 相似文献
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C. B. Soh 《International journal of systems science》2013,44(8):1031-1041
This paper derives sufficient conditions for the stability of impulsive periodic hybrid systems with dependent perturbations. Bounds on the size of the polytope of uncertainties which still guarantees stability are derived. 相似文献
8.
Josephine L. P. Soh Feng Wang Nathan Boersen Rodolfo Pinal Garnet E. Peck 《Drug development and industrial pharmacy》2013,39(10):1022-1035
This article aimed to model the effects of raw material properties and roller compactor operating parameters (OPs) on the properties of roller compacted ribbons and granules with the aid of principal component analysis (PCA) and partial least squares (PLS) projection. A database of raw material properties was established through extensive physical and mechanical characterization of several microcrystalline cellulose (MCC) and lactose grades and their blends. A design of experiment (DoE) was used for ribbon production. PLS models constructed with only OP-modeled roller compaction (RC) responded poorly. Inclusion of raw material properties markedly improved the goodness of fit (R2?=?.897) and model predictability (Q2?=?0.72). 相似文献
9.
Jing Tian Amit Satpathy Ee Sin Ng Soh Guat Ong Wei Cheng Jean-Marc Burgunder Walter Hunziker 《Multimedia Systems》2016,22(6):713-723
Zebrafish is a useful animal model for studying human diseases such as muscle disorders. However, manual monitoring of fish motion is time-consuming and prone to subjective variations. In this paper, an automatic fish motion analytics framework is proposed. The proposed framework could be exploited to help validate zebrafish models of transgenic zebrafish that express human genes carrying mutations which lead to muscle disorders, thus affecting their ability to swim normally. To differentiate between wild-type (normal) and transgenic zebrafish, the proposed framework consists of two approaches to exploit discriminative spatial–temporal kinematic features which are extracted to represent zebrafish movements. First, the proposed approach studies precise quantitative measurements of motor movement abnormalities using a camera with the capability to record videos with high frames rates (up to 1,000 frames per second). This differs from previous works, which only tracked each fish as a single point over time. Second, the proposed approach studies multi-view spatial–temporal swimming trajectories. This differs from previous works which typically only considered single-view analysis of fish swimming trajectories. The proposed motion features are then incorporated into a supervised classification approach to identify abnormal fish movements. Experimental results have shown that the proposed approach is capable of differentiating between wild-type and transgenic zebrafish, thus helping to validate the zebrafish models. 相似文献
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