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Winter jujube (Ziziphus jujuba ‘Dongzao’) is an excellent late maturing variety of fresh-eating jujube in China. Fruit texture is an important indicator of sensory quality. To investigate the correlations among texture indices and establish an evaluation system for winter jujube texture, we used the TMS-Touch instrument to perform a texture profile analysis (TPA) on 1 150 winter jujubes from three major producing areas in China. Eight indices and their best-fit distribution were obtained, including fracture (Pearson), hardness (InvGauss), adhesive force (Weibull), adhesiveness (LogLogistic), cohesiveness (LogLogistic), springiness (BetaGeneral), gumminess (InvGauss), and chewiness (InvGauss). Based on the best-fit distribution curves, each index was divided into five grades (lower, low, medium, high and higher) by the 10th, 30th, 70th and 90th percentiles. Among the texture indices, 82% of the correlation coefficients were highly significant (P

Dragonfly network,proposed by Kim et al.,is a topology for high-performance computer systems.In dragonfly network,compute nodes are attached to switches,the switches are organized into groups,and the network is organized as a two-level clique.There is a link between any two nodes in a group,and there is a global link between different groups.Completely independent spanning trees(CISTs) play important roles in reliable information transmission,parallel transmission and safe distribution of information.In practical application,with the continuous increase of network scale,the requirements for information transmission efficiency and security are becoming higher and higher.Therefore,it is meaningful to study the construction of completely independent spanning trees in dragonfly network.At present,there are many results on completely independent spanning trees in networks,but completely independent spanning trees in dragonfly network have not been studied.In this paper,construction algorithm for the global link of dragonfly network is proposed,which is divided into completely independent spanning tree under re-lative link,absolute link and circulant link.Based on this division,a construction algorithm for the edge set of completely independent spanning tree is given,and the correctness of the above algorithms is proved.Finally,the time complexity of these algorithms is analyzed.

As the foundation of cloud computing technology,the communication performance of data center networks has become a research hotspot in recent years.And as an important infrastructure of data center networks,independent spanning trees(ISTs) attract much attention of researchers because of their application in reliable communication,fault-tolerant broadcasting and secure message distribution,and remarkable results have been obtained on some special networks.But only a few results are reported on the line graphs.A new server-centric network called BCDC was proposed in 2018.Its logic graph is the line graph of crossed cube and is (2n－2)-regular.In this paper,an algorithm is proposed to construct the independent spanning trees on BCDC.Firstly,2n－2 trees are constructed by a parallel algorithm on crossed cube.Then,connect these trees by a special rule,and transfer these trees into 2n－2 independent trees on BCDC through a way of transformation.Finally,the rest nodes of BCDC are connected to these trees by an algorithm which is proposed with time complexity O(N),where N is the number of nodes on BCDC.As a result,we will obtain 2n－2 ISTs rooted at node [ r,N(r,2)] on BCDC,where r is an arbitrary node in n dimensional crossed cube CQn.

Hydrogen, carrying a high energy density and emitting zero greenhouse gases when in use, is particularly promising as an alternative for traditional fossil fuels. Electrochemical water splitting is an economical technology for producing sustainable and high-purity hydrogen gas. However, the intrinsically sluggish kinetics of the anode oxygen evolution reaction (OER) always decreases the efficiency of hydrogen production; the development of highly active and durable electrocatalysts with improved OER kinetics is thus desirable and crucial. Herein, Fe-based metal–organic framework (MOF)-Ni3S2 heterostructure nanocomposites are synthesized on a nickel foam (NF) substrate. The self-supporting Fe MOF-Ni3S2/NF catalyst shows excellent catalytic activities for OER. In alkaline media (1.0 M KOH), only 243 mV of overpotential is needed to reach the current density of 100 mA·cm–2. Even at the commercially viable high current densities of 500 and 1000 mA·cm–2, ultralow overpotentials of 283 and 309 mV are required, respectively. The catalytic activity of Fe MOF-Ni3S2/NF far exceeds that of the noble metal catalysts (e.g., RuO2) and most non-noble metal OER catalysts reported in the literature. In addition, the Fe MOF-Ni3S2/NF nanocomposite exhibits ultrahigh long-term stability at high current densities, with almost no activity attenuation in the chronopotentiometry test conducted at 100 mA·cm–2 and a negligible attenuation (23 mV) at 500 mA·cm–2 for 20 h. Our findings provide insights into designing and preparing cost-effective, highly active, and durable electrocatalysts for OER at high current densities. [ABSTRACT FROM AUTHOR]

In view of problems that traditional handheld terminal is difficult to communicate in coal mine and its standby time is short, a design scheme of handheld terminal with low-power consumption was proposed, and designs of hardware circuit and software of the handheld terminal were introduced. The handheld terminal uses PXA322 processor to finish collection and transmission of data of voice, image and video, programmable management of power supply circuit was designed for that WiFi network wastes electricity in searching on network. The experiment result showed that the handheld terminal has characteristic of reliable communication，low-power consumption and long lifetime, which can satisfy with demand of underground production application.