Results 51 to 60 of about 16,864 (162)
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Additively manufactured AlCoFeNi series eutectic high‐entropy alloys (EHEAs) exhibit nonequilibrium dual‐phase microstructure in the as‐printed state, allowing them to be easily tailored through annealing to explore their strength–toughness potential.
Huidong Wu +13 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2012 目的观察石菖蒲水提取物对小鼠学习记忆及力竭运动后血液学指标的影响。方法利用Morris水迷宫观察小鼠的学习记忆能力,同时测定SOD、MDA、RBC和Hb。结果学习记忆组小鼠灌胃石菖蒲水提取物后,中剂量组和大剂量组找到站台的潜伏期明显缩短 ...
徐德军, 王丹, 张红英, 兰艳
doaj
, 2018 海洋工程中的立管和系泊缆线等柔性圆柱结构轴线与来流常存在一定倾斜角度。由于轴向二次流的存在,倾斜圆柱涡激振动(VIV)相比于垂直圆柱更为复杂。如何对VIV有效抑制一直是工程界和学术界关注的焦点问题之一。本研究设计了室内拖曳水池模型实验,拖曳速度间隔为0.05m/s,范围为0.05～1.0m/s。观测了螺旋列板和控制杆对大长径比(L/D=350,L为圆柱长度,D为圆柱外直径)柔性圆柱横流向VIV的抑制效果,对比了垂直状态(α=0°,其中α为倾角)和倾斜状态(α=45°)附带抑制装置的圆柱模型振动特性 ...
徐万海 +3 more
core
Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 4, Page 492-499, April 2026.ABSTRACT Objectives To assess the value of placental insufficiency markers for estimating the risk of genetic anomalies in fetuses with isolated early‐onset fetal growth restriction (FGR), defined as an estimated fetal weight ≤ 3rd percentile diagnosed ≤ 28 + 6 weeks' gestation.
M. Armengol‐Alsina +17 more
wiley +1 more source
Shiyou jixie, 2014 水基动力无杆抽油机是近几年来发展的一项新型无杆液压采油装置，但由于应用时间短，技术不成熟，存在产油效率低下的问题。为了提高该新系统的工作效率，构建了水基动力无杆抽油机运动关键部位——动力缸的动力学模型，建立了动力缸的运动方程。基于正交试验对运动方程的模拟计算结果进行直观分析和方差分析，得出对水基动力无杆抽油机工作效率影响因素从大到小依次为动力液流速、动力液压力、配重质量，并且当动力液流速为2.252 m/s、动力液压力为9.6 MPa、配重质量为430 kg时工作效率最高 ...
陈祥臻 +5 more
doaj
, 2019 本文研究了三维细长弹体以固定速度垂直入水问题,研究范围被限制在表面闭合优先于深闭合发生情况下的空气腔形成阶段。我们建立了弹体发射实验装置,通过高速相机拍摄了入水过程的时序图像。我们还在开源流体力学平台OpenFOAM~?上开发了基于压力的可压缩多相求解器,用于开展入水流场特性数值模拟研究,采用数值计算得到的空泡形态与实验结果吻合良好。本文讨论了在不同佛汝德数工况下,弹体阻力系数、压力分布、空腔轮廓和流动特性随着无量纲时间的变化规律。分析结果表明,阻力系数在接触水面的瞬间发生突变达到峰值 ...
叶秉晟 +3 more
core
Genomic responses to increased temperature and pollinator selection in Brassica rapa L.
New Phytologist, Volume 250, Issue 2, Page 1231-1247, April 2026.Summary Rapid environmental change reshapes both abiotic stress and biotic interactions, yet it remains unclear how these combined forces structure plants' genomic adaptation. In particular, the joint influence of temperature and pollinator identity, two ecological axes undergoing simultaneous global shifts, has rarely been quantified at genomic ...
Yanqian Ding, Florian P. Schiestl
wiley +1 more source
, 2018 水下气泡的运动是水下航行器减阻和化工领域中的基础问题。本研究针对横向来流条件下气泡形成的现象进行了研究,主要包括循环水槽实验和理论模型的建立与求解。首先用开有通气孔的平板模型在循环水槽中进行实验,并配合高速摄像设备记录气泡各时刻的形态。然后依据力平衡、运动学方程和量纲分析建立了气泡膨胀阶段和分离阶段的理论模型,利用四阶Runge-Kutta算法并结合初始条件进行数值求解,得到气泡在各个时刻的质心位置、倾斜角度和气泡尺寸大小。最后将数值计算结果与实验结果进行对比,结果表明两者具有良好的一致性 ...
叶秉晟 +5 more
core
Current status and developing recommendations of tailings dam failure [PDF]
, 2018 This is the final version of the article. Available from Hindawi Publishing Corporation via the DOI in this record.Tailings dam failure accidents with limited emergency response time and huge potential threats, can often lead to heavy casualties and ...
Bu, L +4 more
core +1 more source
Integrative Conservation, Volume 5, Issue 1, Page 59-73, March 2026.This research reveals the functional stability of mixed species foraging flocks (MSF) and their foraging height change with different taxonomic differences along the elevational gradient at Knuckles Montane Reserve, Sri Lanka. This offers new insights into how MSFs sustain with the elevational gradients supporting the altitudinal shifting species ...
Vimukthi. R. Gunasekeara +3 more
wiley +1 more source