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| 1 | Preliminary 3D printing of large inclined-shaped alumina ceramic parts by direct ink writing显示文摘Three dimensional(3D)printing technology by direct ink writing(DIW)is an innovative complex shaping technology,possessing advantages of flexibility in fabrication,high efficiency,low cost,and environmental-friendliness.Herein,3D printing of complex alumina ceramic parts via DIW using thermally induced solidification with carrageenan swelling was investigated.The rheological properties of the slurry under different thermally-induced modes were systematically studied.The solidification properties of thermally-induced pastes with varying contents of carrageenan were optimized.The experimental results showed that the optimized paste consisting of 0.4 wt%carrageenan could be rapidly solidified at about 55℃,which could print inclined-plane more than 60°in vertical without support,resulting in better homogeneity of the green body.A nearly pore-free structure was obtained after sintering at 1600℃ for 2 h. | Liangliang YANG Xiaojun ZENG Allah DITTA Bo FENG Lizhong SU Yue ZHANG | 2020 | Journal of Advanced Ceramics2020，9，3： | 9 |
| 2 | Relationship between bed shear stress and suspended sediment concentration:annular flume experiments显示文摘在这研究,环形的斜槽实验被执行,用从在 Xiaoyangkou 的内部潮汐的地区的更低的部分收集的沉积样品,江苏海岸,中国。Ariathurai-Partheniades 方程被用来决定床砍强调,由评估在在水列以内的推迟的沉积集中的变化。在床之间的导出的关系砍应力和在海床侵蚀的各种各样的阶段,当流动速度被增加时,很快推迟了沉积集中增加的推迟的沉积集中表演,而是在床上的变化的模式砍应力不照做。在低集中,床砍应力开始与增加显著地增加流动速度。不管多么当集中在 0.55 kg m3 附近到达显然批评的水平时,在床上的变化的率砍应力突然地慢下来,或变得几乎不变,响应流动速度的另外的增加。实验的结果显示那,从向前的、推迟的沉积集中有的批评水平对床的强烈影响砍应力。 | Yunwei WANG Qian YU Shu GAO | 2011 | International Journal of Sediment Research2011，26，4： | 6 |
| 3 | SiO_2/EP梯度耐磨复合涂层的制备及其性能研究显示文摘为改善共混法制备陶瓷/环氧树脂(EP)复合涂层时由于填料颗粒的大沉降现象而引起的涂层粘结性和耐磨性变差,将具有一定粒度分布的Si O2粉末利用喷粉的方法引入环氧树脂涂层,通过控制固化温度和时间来控制不同粒径Si O2颗粒在环氧树脂涂层中的沉降深度,制得了Si O2颗粒呈梯度分布的Si O2/EP复合涂层。研究了Si O2/EP梯度复合涂层的粘结性和耐磨性,探讨了Si O2/EP梯度复合涂层的形成机制。结果表明:不同粒径的Si O2颗粒在环氧涂层中可呈梯度分布,喷粉法制备的Si O2/EP复合涂层的粘结性与耐磨性均高于共混法制备的Si O2/EP复合涂层。 | 杨帆 冯拉俊 李光照 罗宏 翟哲 | 2015 | 腐蚀科学与防护技术2015，27，5： | 2 |
| 4 | Sediment dynamics in an offshore tidal channel in the southern Yellow Sea显示文摘The geomorphology of the southern Yellow Sea(SYS) is characterized by offshore radial sand ridges(RSR).An offshore tidal channel(KSY Channel) is located perpendicular to the coast,comprised of a main and a tributary channel separated by a submarine sand ridge(KSY Sand Ridge) extending seaward.In order to investigate the interactions among water flow,sediment transport,and topography,current velocity and suspended sediment concentration(SSC) were observed at 11 anchor stations along KSY Channel in RSR during a spring tide cycle.High resolution bottom topography was also surveyed.Residual currents and tidally averaged suspended sediment fluxes were calculated and analyzed by using the decomposition method.Results suggested that the water currents became stronger landward but with asymmetrical current speed and temporal duration of flood and ebb tides.Residual currents showed landward water transport in the nearshore channel and a clockwise circulation around the KSY Sand Ridge.Tidally-averaged SSC also increased landward along the channel.The main mechanisms controlling SSC variations were resuspension and horizontal advection,with spatial and temporal variations in the channel,which also contributed to sediment redistribution between channels and sand ridges.Residual flow transport and the tidal pumping effect dominated the suspended sediment flux in the KSY Channel.The KSY Sand Ridge had a potential southward migration due to the interaction between water flow,sediment transport,and topography. | Wen-fei NI Ya-ping WANG Xin-qing ZOU Ji-cai ZHANG Jian-hua GAO | 2014 | International Journal of Sediment Research2014，29，2： | 1 |
| 5 | A computational study of the role of particle size standard deviation on the collision frequency in differential settling显示文摘<正>The results of a simple computational model for differential settling are presented illustrating the significant role that particle size distribution plays in collision frequency and sedimentation rate of particles in a quiescent environment. The model tracks a large number of particles(order 10~5) with log-normally distributed diameters,as they settle at their Stokes settling velocities.Particle collisions are detected and result in larger particles that fall more rapidly.A number of simplifying assumptions are made in the model in order to avoid empirical correlations for phenomena such as collision efficiency and particle shape.These simplifying assumptions were needed to isolate and quantify the role of the particle size distribution.Simulated concentration profiles indicate that,even in the absence of collisions, the standard deviation(σ_D) of the particle size strongly influences the bulk mass settling rate as,for largerσ_D, more mass is concentrated in larger,faster falling particles.The collision frequency is also a strong function ofσ_D. For a given mass concentration the collision frequency first increases linearly with increasingσ_D as greater variation in particle size leads to greater variation in particle velocity,and shorter times for particles to catch each other.For largerσ_D more mass is concentrated in larger particles,so,for a given mass concentration,there are fewer particles per unit volume,increasing the mean distance between the particles and reducing the collision frequency.The implications of these results for sedimentation measurement using optical attenuation techniques are discussed. | C. HEILIGER N. B. KAYE F. Y. TESTIK | 2013 | International Journal of Sediment Research2013，28，1： | 1 |
| 6 | 堆场疏浚淤泥沉降规律计算显示文摘基于淤泥颗粒在水中的受力情况和管道射流基本理论,建立了适用于堆场淤泥颗粒的基本运动方程,得到了淤泥颗粒的沉降速度分布图、水平管道射流各断面上的速度分布图和不同断面处轴向速度分布图。通过拟合淤泥颗粒在堆场中沿垂向、轴向和径向的运动规律,构建了堆场主沉降区内淤泥颗粒粒径范围从0.35~300μm沉降历时17h的分层沉降模型,大致模拟出淤泥沉降规律。淤泥颗粒粒径呈现扇形分布,沿堆场方向沿程递减分布,砂粒在堆场的前250m沉降完全,粉粒沿堆场水流方向依次沉降,黏粒大部分悬浮在水中,有利于后期实现堆场空间的有效利用和疏浚淤泥的资源化利用。 | 张铮 吴燕 胡保安 刘禹杨 | 2013 | 南水北调与水利科技2013，11，2： | 1 |
| 7 | Simulation of particles settling in power-law fluids by combined lattice Boltzmann-smoothed profile methods显示文摘In the current study, the settling, interaction, drafting, kissing, and tumbling of two identical and nonidentical circular particles were simulated in a two-dimensional box in shear-thinning, Newtonian,and shear-thickening fluids by using the combined lattice Boltzmann-smoothed profile methods.Furthermore, the drag coefficient of one particle settling for different power-law indexes and Archimedes numbers was calculated. Also, the effect of the diameter ratio of the two particle pairs was considered during settling. The developed method was validated by simulating the settling of one particle and two identical particles in a Newtonian fluid. To consider two non-identical particles, two cases were examined. In Case A, the larger particle was above the smaller one and in the Case B, the smaller particle was above the larger one. The results showed that the two non-identical particles were separated more easily than the identical ones. In the settling of two particles under the same Archimedes number, the drafting and kissing time considerably increased by changing the non-Newtonian fluid behavior from a shearthinning one to a shear-thickening one. Also, when the larger particle was above the smaller one, the time duration of the kissing stage increased with the decrease in the diameter ratio. | Hamideh Rouhani Tazangi Ataallah Soltani Goharrizi Ebrahim Jahanshahi Javaran | 2021 | International Journal of Sediment Research2021，36，5： | 1 |
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