On weakly bounded well-filtered spaces

In [16], using Rudin sets, Miao, Li and Zhao introduced a new concept of weakly well-filtered spaces—$k$-bounded well-filtered spaces. Now, also using Rudin sets, we introduce another type of $T_0$ spaces—weakly bounded well-filtered spaces, which are strictly stronger than $k$-bounded well-filtered spaces. Some basic properties of $k$-bounded well-filtered spaces and weakly bounded well-filtered spaces are investigated and the relationships among some kinds of weakly sober spaces and weakly well-filtered spaces are posed. It is proved that the category ${\bf KBWF}$ is not reflective in the category ${\bf Top}_{0}$

Activity-assisted barrier-crossing of self-propelled colloids over parallel microgrooves

We report a systematic study of the dynamics of self-propelled particles (SPPs) over a one-dimensional periodic potential landscape, which is fabricated on a microgroove-patterned polydimethylsiloxane (PDMS) substrate. From the measured non-equilibrium probability density function of the SPPs, we find that the escape dynamics of the slow-rotating SPPs across the potential landscape can be described by an effective potential, once the self-propulsion force is included into the potential under the fixed angle approximation. This work demonstrates that the parallel microgrooves provide a versatile platform for a quantitative understanding of the interplay among the self-propulsion force, spatial confinement by the potential landscape, and thermal noise, as well as its effects on activity-assisted escape dynamics and transport of the SPPs

Construction and characterization of a bacterial artificial chromosome library for Gossypium mustelinum

A bacterial artificial chromosome (BAC) library for G. mustelinum Miers ex G. Watt (AD4) was constructed. Intact nuclei from G. mustelinum (AD4) were used to isolate high molecular weight DNA, which was partially cleaved with Hind III and cloned into pSMART BAC (Hind III) vectors. The BAC library consisted of 208,182 clones arrayed in 542 384-microtiter plates, with an average insert size of 121.72 kb ranging from 100 to 150 kb. About 2% of the clones did not contain inserts. Based on an estimated genome size of 2372 Mb for G. mustelinum, the BAC library was estimated to have a total coverage of 10.50 × genome equivalents. The high capacity library of G. mustelinum will serve as a giant gene resource for map-based cloning of quantitative trait loci or genes associated with important agronomic traits or resistance to Verticillium wilt, physical mapping and comparative genome analysis

Elucidating the mesoscale deformation in a multi-principle element alloy with hexagonal closed-packed crystal structure

To date, the exploration of multi-principal element alloys (MPEAs) has rarely ventured into the realm of hexagonal close-packed (HCP) structures. In this research, we embarked on a pioneering systematic comparison between a single-phase Ti-Zr-Hf HCP-MPEA and Ti regarding their dislocation activities and mesoscale deformation homogeneity. Through large-area high-resolution quasi-in-situ slip trace analysis and crystal plasticity finite element modeling, we identified HCP-MPEA’s significantly enhanced pyramidal slip activities—resulted from minimized disparities among different deformation modes—notably improve the material’s intragranular deformation homogeneity. Alongside MPEA’s intrinsically high slip resistance, it renders HCP-MPEA an outstanding strength-toughness combination relative to its conventional HCP counterparts

Development and research of a SS-level universal double-beam assembled bridge barrier

Abstract A wide variety of bridge barriers are used on highways. The bearing capacities of different types of deck slabs are measured in this study by applying the yield line theory to determine the worst-case scenario. An improved configuration for the worst-case barrier base and deck slab is developed, namely the universal double-beam assembled bridge barrier, which can enhance the safety performance of exiting concrete-base bridge barriers. According to the simulated impact test results, the new barrier meets SS-level requirements in terms of containment, redirective, and buffering performance as specified in the Standard for Safety Performance Evaluation of Highway Barriers (JTG B05-01-2013). The barrier structure’s compatibility with various bases is also analyzed. SS-level impact tests are conducted on real vehicles, including cars, buss, and trucks. The results show that the safety performance of the new barrier configuration reaches SS-level, and the barrier is universally compatible with concrete bases with a height of 63 cm and above

Multi-Source Stego Detection with Low-Dimensional Textural Feature and Clustering Ensembles

This work tackles a recent challenge in digital image processing: how to identify the steganographic images from a steganographer, who is unknown among multiple innocent actors. The method does not need a large number of samples to train classification model, and thus it is significantly different from the traditional steganalysis. The proposed scheme consists of textural features and clustering ensembles. Local ternary patterns (LTP) are employed to design low-dimensional textural features which are considered to be more sensitive to steganographic changes in texture regions of image. Furthermore, we use the extracted low-dimensional textural features to train a number of hierarchical clustering results, which are integrated as an ensemble based on the majority voting strategy. Finally, the ensemble is used to make optimal decision for suspected image. Extensive experiments show that the proposed scheme is effective and efficient and outperforms the state-of-the-art steganalysis methods with an average gain from 4 % to 6 %

Numerical Study of a Polarization Selective Visual Optical Switch

The subwavelength structure based on metamaterial has been widely used in the application of structure color due to its unique characteristics. Here, a composite structure consisting of a circular hole and different number of metal strips is proposed. By changing the polarization direction of the incident light, the resonance peak in the visible light range shifts, and the material presents different colors. At the same time, take advantage of the shift of the resonance peak, a plasmonic optical switch, of which on/off states can be indicated by the structural color, is constructed, and the maximum contrast ratio is more than 20 dB. In addition, by means of changing the geometric parameters and materials of the metal strip, the colors presented basically cover the whole visible light range. This method theoretically proves the feasibility of using subwavelength structure to construct visual plasmonic optical switch using structural color in the visible light range, which provides a broad prospect for the application of multiple physical mechanism in nanostructure design