Results 131 to 140 of about 455,453 (240)
离子交换-ICP发射光谱法测定水中微量Cr(Ⅵ)和Cr(Ⅲ)
Gongye shui chuli, 1987 本文研究了用国产树脂分离富集水中微量Cr(Ⅵ)和Cr(Ⅲ)，并用ICP发射光谱法直接测定洗脱液中Cr(Ⅵ)和Cr(Ⅲ)的方法。文中用正交试验法选择离子交换条件，方法快速、准确。本方法可将0.05PPm数量级的Cr(Ⅵ)和Cr(Ⅲ)进行较完全的分离和有效的富集。适于环境监测工作中对有害铬的测定。
邓名馨, 尹世荣
doaj
, 2005 采用硫酸盐还原菌处理含铬(Ⅵ)废水,研究了其去除铬(Ⅵ)的最适宜工艺条件。实验表明,该菌的适用范围广,处理含铬废水的能力强。在菌液与废液体积比为1.0:1、铬(Ⅵ)质量浓度为150mg/L条件下处理36h,铬(Ⅵ)去除率达99.9%
李福德 +3 more
core
Advanced Engineering Materials, EarlyView.A combined finite element and phase‐field approach predicts the evolution of microstructure during the directional solidification of Ni‐based superalloys. The model reveals how withdrawal rate, temperature gradient, and wall thickness control the dendrite spacing, highlighting the strong effect of surface regions in thin sections where dendrite growth ...
Sean Böhm +3 more
wiley +1 more source
Gongye shui chuli, 2011 采用氢氧化钠-异丙醇对松树叶进行化学改性,同时将改性松树叶用于对Cr(Ⅵ)的吸附实验。通过单因素实验,考察了处理条件对Cr(Ⅵ)吸附效果的影响。结果表明,对50 mL质量浓度为10.0 mg/L的Cr(Ⅵ)溶液,在溶液pH=3.0,投加改性松树叶0.2 g,温度30℃,接触时间90 min的条件下,Cr(Ⅵ)的去除率可达82%以上。改性松树叶在20～30℃对Cr(Ⅵ)的吸附是吸热过程,以离子交换吸附为主,吸附过程遵循Freundlich吸附等温线。
杜婷 +4 more
doaj
Low‐Angle Grain Boundaries and Re‐Segregation in Single‐Crystalline Ni‐Base Superalloys
Advanced Engineering Materials, EarlyView.This work demonstrates that Re‐segregation at low‐angle grain boundaries (LAGBs) in Ni‐base superalloys is influenced by misorientation angle. Advanced microscopy and atom probe tomography reveal that higher misorientation angles increases Re‐segregation.
Alireza B. Parsa +9 more
wiley +1 more source
Gongye shui chuli, 2018 以鸡粪和玉米芯的混合物为原料，制备热解生物炭前驱体（BPC），并用尿素对其水热改性，得到水热改性热解生物炭（HMPC），研究了HMPC对废水中Cr（Ⅵ）和甲基橙（MO）的吸附性能。结果表明，在温度为25℃，Cr（Ⅵ）、MO溶液初始pH分别为2.0、6.5，搅拌速率为150 r/min，HMPC投加量为1 g/L的条件下，对初始质量浓度为100 mg/L的Cr（Ⅵ）、MO的吸附量分别为56.26、73.31 mg/g。HMPC对Cr（Ⅵ）和MO的吸附较好地遵循准二级动力学模型 ...
余剑刚 +4 more
doaj
Advanced Engineering Materials, EarlyView.This study demonstrates how optimizing laser power, scanning speed, and hatching distance in laser powder bed fusion can boost the productivity of Inconel 718 manufacturing by up to 29% while maintaining mechanical integrity. The work delivers a validated process window and cost–time analysis, offering industry‐ready guidelines for efficient additive ...
Amir Behjat +7 more
wiley +1 more source
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
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