Results 11 to 20 of about 1,121,913 (165)

Land use overrides climatic controls on soil organic nitrogen transformations: Contrasting responsiveness between forest and cropland ecosystems

open access: yesFunctional Ecology, Volume 40, Issue 7, Page 2128-2142, July 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Soil organic nitrogen (SON) transformation is critical for global nutrient cycling and ecosystem productivity, yet how its responsiveness to climate change differs across diverse land use types remains poorly resolved.
Xinyi Yang   +10 more
wiley   +1 more source

Effect of organic substance on the microcrystalline structure of magnesium hydroxide(有机质对氢氧化镁微晶结构的影响)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2003
在有机介质中制备有机质复合氢氧化镁,并对产品进行水热处理.通过XRD、SEM和TG-DTA的分析表明,非水热处理得到的复合氢氧化镁晶体粒径及晶面间距较小,晶格畸变率大,其分解温度比纯氢氧化镁降低14~68 ℃.经水热处理后,有机质复合氢氧化镁晶体变规整,晶粒增大、畸变率减小,聚集体大小均匀、分散性改善,其分解温度相应提高5~20 ℃,晶体平均粒径增加31.3~69.1 nm.
DINGXiao-chu(丁孝初)   +2 more
doaj   +1 more source

Developmental plasticity drives converge nt shifts in phosphorus acquisition strategies towards root phosphatase activity in Moso bamboo under nitrogen addition

open access: yesFunctional Ecology, Volume 40, Issue 7, Page 2221-2236, July 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Anthropogenic nitrogen (N) deposition is a major driver of global change. However, its effects on the developmental plasticity of plant nutrient strategies remain poorly understood.
Quan Li   +11 more
wiley   +1 more source

氟醚橡胶热分解规律及动力学研究

open access: yes四川大学学报. 自然科学版, 2015
用热失重分析方法(TGA),研究了氟醚橡胶在氮气中的热分解规律,并探讨了不同升温条件和不同失重阶段氟醚橡胶的热分解动力学.研究结果表明:在氮气中,氟醚橡胶的热分解过程可分为两个阶段;不同升温速率下其热分解反应机理相同;升温速率越大,氟醚橡胶的分解温度越高.应用等转化率法(Friedman微分法),在不假设反应机理函数的情况下,分析了氟醚橡胶热分解在不同转化率时的活化能,其平均值为241.4kJ/mol;同时用Coats-Redfern法分析得出氟醚橡胶在不同升温速率时的热分解动力学参数基本相同 ...
何利万, 皮红, 丁祖群, 侯平安
doaj  

Characterization of poultry and swine manure-derived biochar as affected by pyrolysis temperature(热解温度对畜禽粪便制备的生物质炭性质的影响)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2014
以猪粪和鸡粪为原料,研究了热解温度(200~700 ℃)对生物质炭物理和化学性质的影响.结果表明,生物质炭的得率随着热解温度的升高逐渐降低,猪粪生物质炭的得率较鸡粪高;猪粪和鸡粪生物质炭的灰分含量分别为41. 2%~70. 6%和20. 3%~48.1%.生物质炭均为中性或碱性,300~700 ℃热解所制备的生物质炭的pH值不仅与灰分含量有关,还可能与Ca含量密切相关.红外光谱表明,低温热解条件下(≤300 ℃)生物质炭中的含氧官能团与原材料相比无明显变化;但是当热解温度高于400 ℃时 ...
WANGLihua(王立华), LINQi(林琦)
doaj   +1 more source

Dehydrogenation Thermodynamic and Kinetic Challenges of Mg‐Ni‐Based Alloy Hydrides

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT Solid‐state hydrogen storage stands as a pivotal, safe, and efficient solution for the future hydrogen economy. Among diverse hydrogen storage systems, Mg‐Ni‐based alloy hydrides are recognized as cornerstone materials. However, their practical application is hindered by two core challenges: the high thermodynamic stability of the hydride ...
Jinglan He   +6 more
wiley   +1 more source

Oxygen Doping and Crystal–Amorphous Multiphase Coupling Synergistically Improve the Wear Resistance of NiTiCu Alloy

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT NiTi shape memory alloys (SMAs) show excellent performance in vibration damping and corrosion resistance. However, due to low hardness and lack of self‐lubrication, they suffer severe friction and wear during service. Although various strategies including doping and heterostructure design have been proposed, the effects are unsatisfactory.
Huwen Ma   +13 more
wiley   +1 more source

聚酰胺6催化解聚的研究

open access: yes四川大学学报. 自然科学版, 1992
聚酰胺6是一种结晶性高聚物,加热此类高聚物则会发生解聚合反应而分解,这时的反应速度、状态等会随加热温度及有无催化剂等反应条件而异.不少人对尼龙6的热分解已进行了研究,但对它在催化剂存在下热解反应的研究,尚未见报道.我们用居里点裂解器研究了聚酰胺6的催化热解聚行为,并对催化剂作了筛选,同时又用热重分析(TG)法计算了催化热解反应的动力学参数.
华百行   +4 more
doaj  

Advances in BiOCl‐Based Photocatalysts: From Synthesis, Structural Tailoring to Solar Energy Conversion

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT Semiconductor photocatalysis represents a pivotal frontier in the quest for sustainable energy and environmental remediation. Among the diverse catalytic materials, Bismuth Oxychloride (BiOCl) has emerged as a particularly promising candidate due to its unique layered structure, featuring [Bi2O2]2+ layers intertwined with halogen ions, which ...
Liu Han   +5 more
wiley   +1 more source

聚苯酯的热分析研究

open access: yes四川大学学报. 自然科学版, 2001
以聚苯酯工业产品为原料 ,使用DSC ,TMA和TG等热分析手段 ,研究了该材料的热转变行为和热分解过程 ,计算了热分解反应的动力学参数 ,并根据动力学参数 ...
杨争, 于佩潜, 谢美菊, 余自力
doaj  

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