Results 131 to 140 of about 602 (238)
Creating Ti–Fe α/β Alloys by Diffusion‐Driven Solid‐State Processing
Advanced Engineering Materials, EarlyView.This study proposes making alloys containing fast diffusing elements that are difficult to produce by ingot metallurgy, by diffusion‐driven solid‐state HIP processing of elemental powders and low‐temperature homogenisation. Here, novel Fe‐Ti α–β alloys are formed having fine α–β lamellae, a small β prior grain size without significant intermetallics ...
Jiaqi Xu +10 more
wiley +1 more source
Gongye shui chuli, 2017 采用氯化锌浸渍活化法制备了氯化锌造孔壳炭，研究了其对废水中Cr（Ⅵ）的吸附效果，并采用SEM、FTIR和BET等方法对改性壳炭的结构进行了表征。结果表明，处理初始Cr（Ⅵ）质量浓度为20 mg/L的水样，当温度为25℃，改性壳炭投加量为0.5 g，pH为2.0，吸附时间为180 min时，Cr（Ⅵ）去除率为98.8%，最大Cr（Ⅵ）吸附量为11.284 mg/g。拟合结果显示，Langmuir等温吸附方程可以较好地拟合改性壳炭对Cr（Ⅵ）的吸附过程，该动态吸附平衡遵循拟二级动力学方程。
鲁秀国, 段建菊, 唐朝春
doaj
海水中铬化学形态分析和海洋细菌对水体中Cr(Ⅵ),Cr(Ⅲ)的作用
, 1990 本文建立了海水和高有机质含量的海洋细菌培养介质中铬的主要化学形态Cr(VI)．Cr（III)及有机结合态铬的分析方法，提出了相应的分析流程。研究了海洋细菌对水体中Cr(VI），Cr（III）的作用．海洋细菌对Cr(VI)的忍受能力远高于海洋浮游植物。在充氧水体中，细菌可将Cr(VI）还原为Cr(III).Cr(III）又可进而转化为有机结合态铬或与生物结合。从而提供了对天然海水中铬价态热力学不平衡的动力学解释。学位：理学硕士院系专业：海洋与环境学院海洋学系_海洋化学学号 ...
王培新
core
Time‐Dependent Oxidation and Scale Evolution of a Wrought Co/Ni‐Based Superalloy
Advanced Engineering Materials, EarlyView.This study shows how a new wrought Co/Ni‐based superalloy resists oxidation at 800 ∘$^\circ$C. The oxide scale changes from rough, fast‐growing spinel to a dense, protective chromia–alumina layer. Atom probe analysis reveals tiny refractory‐rich bubbles at the interface that mark the transition to long‐term, diffusion‐controlled protection ...
Cameron Crabb +6 more
wiley +1 more source
A Review on Cu2O-Based Composites in Photocatalysis: Synthesis, Modification, and Applications. [PDF]
Molecules, 2023 Su Q, Zuo C, Liu M, Tai X.
europepmc +1 more source
Karl Popper and the Mechanisms of Hydrogen Embrittlement
Advanced Engineering Materials, EarlyView.Representation of the beginning of loss of ductility rather than embrittlement. Small concentrations of hydrogen in a diffusible form within iron are well‐established to harm the mechanical integrity of steels. There are theories that attempt to explain the pernicious role of hydrogen.
H. K. D. H. Bhadeshia
wiley +1 more source
, 2005 以Na2SiOs为硅源,非离子型表面活性剂脂肪醇聚氧乙烯醚A（EO）9为模板剂合成了介孔Cr-MSU-1,并通过XRD、HRTEM、N2吸附-脱附、FT-IR和DR UV-Vis等手段对其进行了表征.结果表明,Cr进入了介孔MSU-1骨架中,并大部分以四配位的Cr（Ⅵ）形式存在.将Cr-MSU-1作为催化剂用于CO2氧化乙烷脱氢反应,表现出了良好的催化活性,650℃下乙烷的转化率和乙烯的选择性分别为31.7%和96.1%
李会泉, 张懿, 蔡卫权, 刘立成
core
Advanced Engineering Materials, EarlyView.Copper‐based composites enhanced with carbon feature convenient mechanical properties and favorable electric conductivity. Processing via deformation and thermomechanical treatments can introduce advantageous microstructures further enhancing their performance. Herein, copper–graphene powder‐based composites are directly consolidated via rotary swaging
Radim Kocich +3 more
wiley +1 more source
Gongye shui chuli针对工业废水中六价铬〔Cr（Ⅵ）〕高毒性且难以高效去除的问题，本研究成功制备了一种负载硫化亚铁的磷酸改性生物炭复合材料（FeS-PBC），并系统考察其对Cr（Ⅵ）的去除性能及作用机制。结果表明，在600 °C、40% H3PO4浓度、热解时间2 h，FeS与PBC的质量比为2∶1时，FeS-PBC表现出最佳的Cr（Ⅵ）去除性能：在初始Cr（Ⅵ）质量浓度为100 mg/L、pH=4.5、温度为25 °C条件下，去除率达87.3%，为未改性生物炭的5.5倍；当温度升至35 °C时，最大吸附容量可达123 ...
陈瑞, 喻崴伦, 孙健, 贺荣辉
doaj
Behavioral assessment scale of consciousness for nonhuman primates: A Delphi study. [PDF]
Sci Prog, 2023 Sun W +8 more
europepmc +1 more source