Results 31 to 40 of about 1,033,759 (150)

Glycerophosphocholine‐Mediated Dual Regulation for Highly Stable Aqueous Iron‐Ion Batteries

open access: yesRare Metals, Volume 45, Issue 8, August 2026.
ABSTRACT Iron‐ion batteries (FeIB) offer the advantages of low cost and high capacity, demonstrating potential for large‐scale energy storage. However, severe hydrogen evolution reaction (HER) occurs during cycling, which significantly impacts battery lifespan.
Tian Yang   +6 more
wiley   +1 more source

臺北市南部の土壤の加水分解酸度

open access: yes, 1934
  關於探討土壤酸性反應的原因,前行研究為數眾多。其中最為普遍的理由有兩種----腐殖酸(Humic Acid)及酸性含水矽酸鹽(Silicate)的存在。前者造成被稱為酸性腐殖質土的酸性土壤,後者造成了酸性礦物質土壤。酸性腐殖質土壤存在的比例,較之酸性礦物質土壤,其面積相當稀少,一般來說土壤的酸性肇因於其中大部分為酸性礦物質土壤。在前行研究中,將此酸性礦物質土壤的酸度,區別為水解性酸度(Hydrolytic acidity)、交換性酸度(exchange acidity)、活性酸度(active ...
王迸
core  

酸度对土壤溶液中铜形态的影响及其与黑麦草生长关系的研究

open access: yesShuitu Baochi Xuebao, 2006
研究了酸度对土壤溶液中铜形态的影响以及不同形态铜与黑麦草吸收及其生长的关系。结果表明:酸度强烈地影响土壤溶液中铜的化学形态,随着酸度的增加,土壤溶液中各种形态铜的含量包括水溶态铜、离子态铜及与易溶有机物结合的铜都相应增加,而且随处理铜浓度的增加不同酸度土壤上的差异更大。酸度能影响黑麦草对铜的吸收,随酸度的增加,黑麦草对铜的吸收增加。其中在对照及低铜处理中两种土壤的差异不显著,而在处理铜浓度高于50mg/kg以后两种土壤上的黑麦草铜含量差异都达显著水平。黑麦草的生长随土壤酸度的增加而变差 ...
李文庆, 张民, 束怀瑞
doaj   +2 more sources

Copper Slag‐Derived Cu3Fe17@C Alloy Enabling Efficient Peroxymonosulfate Activation for Levofloxacin Degradation via Cu‐Mediated Electron Transfer With Suppressed Metal Leaching

open access: yesRare Metals, Volume 45, Issue 8, August 2026.
ABSTRACT Although alloy‐based materials present potential for peroxymonosulfate (PMS) activation, metal ion leaching remains severely restricted during the pollution degradation process. Herein, the porous carbon‐supported Fe–Cu alloy derived from industrial copper slag was prepared to remove the organic pollutants from wastewater while inhibiting the ...
Xuanren Chen   +10 more
wiley   +1 more source

活化硅酸特性与生产性应用研究

open access: yesGongye shui chuli, 2004
pH越接近中性,硅酸的胶凝速度越快,碱度或酸度越高,胶凝速度相对减缓;硅酸活化过程中单体和低聚体迅速转化为高聚体,活化产物中氧化硅的主要存在形态为高聚体,达80%以上,凝胶色谱测定其相对分子质量为9.3×103,制备的活化硅酸为粒状阴离子型无机高分子物质。黄浦江原水中活化硅酸助凝剂最佳投加质量浓度约1mg/L(以SiO2计),可以节省混凝剂用量28.2%,沉淀池出水浊度稳定。
张东, 乐林生, 陆善伦
doaj   +2 more sources

Dual‐Bioactive Lignin‐Based Microcarrier Hydrogel Platform via Metal Salt Crosslinking for Synchronized Infection Eradication and Bone Regeneration

open access: yesRare Metals, Volume 45, Issue 8, August 2026.
ABSTRACT Infected bone defects represent a dual therapeutic challenge demanding concurrent infection inhibition and osteogenesis promotion. Systemic antibiotic administration is taken as a classical treatment protocol but often yields inadequate local antibiotic concentrations and delayed bone repair.
Xucai Wang   +8 more
wiley   +1 more source

醋酸-醋酸铵缓冲体系中柠檬酸、草酸和苹果酸对高岭石的溶解特征

open access: yes, 2013
采用间歇法(batch method)模拟研究醋酸-醋酸铵缓冲体系中柠檬酸、草酸和苹果酸三种低分子量有机酸对高岭石的溶解特征。结果表明:柠檬酸、草酸和苹果酸三种有机酸均能显著促进高岭石的溶解,溶解能力都是随其浓度和酸度的升高而增强;当有机酸浓度为1mmol/L,pH3.5时,草酸>柠檬酸>苹果酸;pH5.5和pH4.5时,柠檬酸>草酸>苹果酸;而当有机酸浓度≥5mmol/L时,草酸>柠檬酸>苹果酸,且对高岭石的溶解能力都大于无机酸。当柠檬酸、草酸和苹果酸浓度为1mmol/L时,反应级数(nHL)分别为0.
胡华锋   +3 more
core  

Synergy Effects of Dual‐Gel‐Assisted Structural Engineering and Bimetallic Doping Regulation Realize Ultrastable High‐Rate Performance of NASICON Cathodes for Sodium‐Ion Batteries

open access: yesRare Metals, Volume 45, Issue 8, August 2026.
ABSTRACT Na‐superionic‐conductor‐type (NASICON) Na4MnV(PO4)3 (NMVP) is an appealing cathode for sodium‐ion batteries (SIBs), but its application is hindered by Jahn–Teller distortions, sluggish Na+ kinetics and poor conductivity, leading to rapid capacity fade.
Huan Liu   +8 more
wiley   +1 more source

一种高收率、高光学纯度的L-乳酸丁酯合成方法

open access: yes, 2003
一种高收率、高光学纯度的L-乳酸丁酯的合成方法,以浓硫酸为催化剂,浓硫酸的加入量为乳酸质量的1.5%,正丁醇和乳酸的摩尔比可以是0.5-4,反应温度为50-150℃,反应结束后直接加入固体无水醋酸钠、固体无水碳酸钠、固体无水碳酸氢钠或固体无水氢氧化钠,中和硫酸;然后过滤分离。该合成方法可使L-乳酸丁酯的收率达90%以上,光学纯度达99.5%以上 ...
刘菁, 李德才, 徐杰
core  

零价铁活化过硫酸铵氧化降解苯酚的研究

open access: yesGongye shui chuli, 2012
利用零价铁活化过硫酸铵产生硫酸根自由基降解苯酚,研究了pH、铁粉投加量、过硫酸铵浓度对苯酚降解率的影响.结果表明:在零价铁/过硫酸铵体系中,当苯酚初始浓度为0.2 mmol/L、过硫酸铵浓度为2.0 mmol/L、零价铁加入量为0.24 g/L、pH=2.8、温度为20℃、反应75 min后,苯酚去除率可达到95.1%;分子探针实验证实零价铁活化过硫酸铵降解苯酚是硫酸根自由基参与的氧化反应.
张瑛洁   +4 more
doaj  

Home - About - Disclaimer - Privacy