Results 31 to 40 of about 1,290,109 (150)

Tunable Ce‐Doping Engineering in TiFe‐Based Alloys for High‐Activation and High‐Durability Hydrogen Storage

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT TiFe‐based hydrogen storage alloys have garnered significant attention because of their cost‐effectiveness, high hydrogen capacity, and favorable hydrogen absorption/desorption characteristics. However, practical application was limited by activation challenges and sensitivity to environmental poisoning.
Yuehai Li   +8 more
wiley   +1 more source

有机肥替代化肥氮素对麦田土壤碳氮迁移特征的影响

open access: yesShuitu Baochi Xuebao, 2019
利用小麦田间试验,设置控释尿素(CRU)、有机肥(OF)替代30%,50%,70%控释尿素氮量处理,并以普通尿素(Urea)为对照,研究等氮条件下有机肥替代不同比例化肥氮素对土壤碳氮迁移特征及小麦产量的影响。结果表明:有机肥处理小麦总生物量较Urea显著增加13.83%~17.57%,籽粒产量增加1.6%~10.5%,随有机肥替代化肥氮素比例增加,籽粒增产效应降低,70% OF与Urea无显著差异,但显著低于CRU处理。CRU、30% OF和50% OF处理氮素农学效率较Urea显著提高90.2 ...
杨修一   +6 more
doaj  

一种高效降解持久性有机氯代污染物的方法

open access: yes, 2011
本发明涉及有机氯代污染物的降解方法,具体的说一种高效降解持久性有机卤代污染物的加氢脱卤方法。具体地说,本发明反应体系为有机-水两相溶剂体系,是持久性有机氯代污染物在常温、常压下加氢脱氯,采用过渡金属做催化剂,该类催化剂由活性组分与载体组成。活性组分为:Pd、Rh、Ru、Pt、Ni、Fe、Co、Ir中的一种或多种,活性组分占催化剂质量分数的0.5%~5.0%。反应压力为常压,反应温度控制在30~55℃。本发明制备简单,不需要特殊设备。脱卤反应条件温和,操作易于控制,催化剂用量少 ...
薛朋   +6 more
core  

Achieving Transboundary Water Security Through Water Innovations: A Framework and Cases

open access: yesWorld Water Policy, Volume 12, Issue 1, February 2026.
ABSTRACT Alternative sources of freshwater, provided by various innovations, have long been available to countries facing acute water stress. We hypothesize that avoiding and/or resolving conflict with neighbors—caused by the uncertainty of continued access to shared surface water and groundwater sources—is another driver of innovation adoption ...
David Lewis Feldman
wiley   +1 more source

长期施肥对黑土有机碳矿化和团聚体碳分布的影响

open access: yes, 2009
采用我国东北地区的连续施肥28 a的典型黑土,通过颗粒分组的方法,研究了长期不同施肥处理对土壤团聚体形成和有机碳在各级团聚体中的分布规律,以及各粒级团聚体对养分的贡献能力的影响。结果表明,施用有机肥促进了土壤中大颗粒团聚体(>0.25 mm)的形成,尤其以21 mm粒级增加的比例最大;而当化肥和有机肥配合施用后 ...
有效性   +3 more
core  

Securing Bangladesh's Nuclear Future: Is the Regulated Asset Base Model the Answer to Address Project Corruption?

open access: yesJournal of Critical Infrastructure Policy, Volume 7, Issue 1, Spring/Summer 2026.
ABSTRACT Bangladesh's goal of achieving high‐income status by 2041 requires dependable, low‐emission, and affordable energy. With near‐universal grid coverage and increasing demand, nuclear energy is a strategic asset for long‐term baseload supply. However, the existing financing model, typified by the country's most expensive $12.65 billion Rooppur ...
Hafiz Ahmed
wiley   +1 more source

新的有机化合物代码及计算机估算系统-工程有机化学数据库(ORDB)的新发展

open access: yes, 1987
在论文期间,建立了部分有机化合物基础物性数据库,其中有725个化合物的物性数据。本文研制了一种新的有机化合物结构代码,称为“显式有机化合物结构代码”(以下称“显式代码”)。这个代码与分子式的写法基本相同,因此十分容易掌握。在“显式代码”的基础上实现了计算机自动解析功能团。与数据库相连接的估算系统可以估算20种不同状态下的物性参数,其中有五种估算方法是功能团贡献法。这些功能团贡献法实现了自动解析功能团。估算系统可以只要求输入分子式和结构代码就能够输出所需要的物性参数而不必输入任何其它中间参数 ...
孙荣昌
core  

Macroeconomic and Sectoral Determinants of Alternative Infrastructure Funding Models in Ghana: A Dynamic Time‐Series Analysis

open access: yesJournal of Critical Infrastructure Policy, Volume 7, Issue 1, Spring/Summer 2026.
ABSTRACT Ghana faces a persistent infrastructure financing gap, prompting the exploration of alternative funding models such as Public–Private Partnerships (PPPs), green bonds, and blended finance instruments. This study uses macroeconomic and sectoral indicators as proxies to evaluate the long‐term impact of these models on economic performance in ...
Samuel Kojo Aidoo   +1 more
wiley   +1 more source

无机陶瓷膜处理轧钢乳化液废水的研究

open access: yesGongye shui chuli, 2003
采用无机陶瓷膜处理轧钢乳化液废水,完全可以解决我国钢铁行业难以处理的乳化液废水问题;国产无机陶瓷膜替代进口同类设备,可大大降低处理成本,具有较大的经济效益和社会效益,其主要技术经济指标与国外同类技术相比具有较大的优势。
董相声
doaj   +2 more sources

卤代烃常压羰基化合成有机酸

open access: yes, 1992
一种常压条件下卤代烃羰基化合成有机酸的方法,该方法所用反应采用高分子负载钯催化剂,例如:聚乙烯吡咯烷酮(PVP),聚苯醚(PPO),聚苯乙烯(PS),聚砜(PSu)和聚丙烯酰胺(PAA)等高分子负载钯催化剂,并添加一定量的碱金属氢氧化物,反应在低于80℃温度下进行,催化剂不仅活性高,而且效率也高。尤其是对于卤代芳烃(如氯代苯)的羰基化反应,使用该催化体系在常压和70℃温度下具有高的催化活性 ...
高汉荣, 余道容, 廖世健, 徐∴
core  

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