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| 1 | Structure induced wide range wettability:Controlled surface of micro-nano/nano structured copper films for enhanced interface显示文摘The wettability of materials used in the production of devices employed in various technological domains have attracted significant attentions.Therefore,it is important to design the surfaces of these materials such that they can provide the required surface free energy and simplify the interfacial structure.Herein,various Cu films with a highly controllable surface wettability and a wide range of contact angles ranging from 6°to 152°were fabricated,and the corresponding mechanism was discussed.A wide range of wettability was realized by controlling the surface structure of the Cu film.The nanogap structure of the vertical nanowire-array film led to a high surface free energy.Similarly,the oblique nanowirearray film increased the surface free energy;however,the surface free energy was dependent on the size of the nanowires rather than on the nanogaps owing to the crystallinity of the film.Additionally,cluster-nanowire-array films were designed to realize a wettability transition from hydrophilicity to hydrophobicity with a constant surface free energy.The Cu foam possessed a superhydrophilic surface owing to its high porosity,whereas the cluster-nanoparticle structure possessed a superhydrophobic surface.In addition,we noted that the structure-induced wettability played an important role in tuning the semiconductor and metal interfacial stress and simplifying the interfacial structure.Furthermore,the outstanding electrical conductivity of the Cu films indicates its promising potential as an electrode.The structure-induced wettability proposed in this study can be applied for a wide range of materials,particularly for films used for advanced applications. | Lili Cao Bingwei Luo Hongli Gao Min Miao Tao Wang Yuan Deng | 2021 | Journal of Materials Science & Technology2021，，25： | 1 |
| 2 | Population turnover promotes fungal stability in a semi-arid grassland under precipitation shifts显示文摘土壤中细菌和真菌的稳定性在维持土壤生态系统功能方面起着重要作用,环境条件的改变直接影响细菌和真菌的组成与结构。已有研究表明,土壤真菌群落稳定性对降水变化响应的敏感性比细菌低,但其内在机制还不清楚。在内蒙古典型草原建立3年的增减降雨实验平台,设置5个降水梯度,包括分别增加和减少30%和60%的降水量以及对照,比较控制不同的降水水平对土壤细菌和真菌多样性的影响,包括α多样性,β多样性和细菌/真菌群落组成的变化。本研究开发了一个概念模型来反映不同降水条件下土壤细菌和真菌的稳定性特征,其中模型山谷的深度表示微生物抵抗力(Resistance),谷的宽度代表生态弹性(Ecological Resilience)。结果表明,增加和减少60%的降水量均显著降低了细菌的丰富度,同时显著增加了细菌均匀度,但对真菌的丰富度和均匀度没有显著的影响。降水对细菌α多样性的影响高于真菌,说明细菌对水分胁迫的敏感性大于真菌。而真菌群落的周转比细菌快,包括组成变化(Composition Variation),多样性指数和变异系数(Coefficient Variation),反映了真菌群落具有较高的群落可变性,使得降水变化对真菌群落的影响较小。概念模型中两种相反的情景表示细菌和真菌对降水变化不同的响应模式:真菌群落对水分胁迫响应不敏感,可以用宽谷中的一个球来表示,球虽然在较大范围内往复摆动,但仍接近稳定状态;而细菌群落对水分响应敏感,即稳定性低,可以表示为一个球在较窄的谷里远离平衡态的位置摆动。基于本研究结果,半干旱草原真菌群落比细菌群落具有更高的稳定性,该结论对于量化群落稳定性特征具有重要意义。 | Nannan Wang Lei Li Bingwei Zhang Shiping Chen Wei Sun Yukun Luo Kuanhu Dong Xingguo Han Jianhui Huang Xiaofeng Xu Changhui Wang | 2020 | Journal of Plant Ecology2020，13，4： | 0 |
| 3 | MULTISCALE IMAGE SEGMENTATION USING FRACTAL AND NEURAL NETWORK显示文摘Clustering algorithms in feature space are important methods in image segmentation. The choice of the effective feature parameters and the construction of the clustering method are key problems encountered with clustering algorithms. In this paper, the multifractal dimensions are chosen as the segmentation feature parameters which are extracted from original image and wavelet-transformed image. SOM (Self-Organizing Map) network is applied to cluster the segmentation feature parameters. The experiment shows that the performance of the presented algorithm is very good. | Yang Shaoguo Yin Zhongke Luo Bingwei (University of Electronic Science and Technology of China, Chengdu 610054) | 1999 | Journal of Electronics(China)1999，16，4： | 0 |
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