Results 51 to 60 of about 108,140 (201)

ヤマユリ シュシ ノ ハツガ ソクシン ニ カンスル ケンキュウ [PDF]

open access: yes, 1994
【摘要】ヤマユリ種子は播種後下記の段階をへて出葉に至る:高温感応期(種子休眠打破段階),地下発芽・小球形成期,低温感応期(上胚軸休眠打破段階),出葉期(地上に葉が出現する段階).本報告では,播種から出葉までの日数を最短にする条件を明らかにすることを目的として,各段階の休眠打破,発育をすみやかに進める温度条件などについて検討し,以下の結果を得た.高温感応期は種子を湿状態で290℃,6週間の処理を行うと休眠打破効果が大きく,次の段階で地下発芽が促進された.高温処理後から低温処理開始までの間に地下発芽し ...
原 靖英, 高樹 英明
core   +1 more source

Thermally Driven Hydrogenation of CO2 to Light Olefins Over Hollow Cubic In2O3‐La‐ZIF‐8 Tandem Catalyst

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Thermally driven hydrogenation of CO2 to light olefins (C2=–C4=) using metal oxide‐zeolite tandem catalysts is an effective strategy for achieving carbon neutrality. However, progress in this area is constrained by zeolite pore transport limitations, acid‐site inactivation, and surface carbon poisoning.
Haifeng Tian   +10 more
wiley   +1 more source

高压开关设备触头温度监测技术研究进展

open access: yesGaoya dianqi, 2015
高压开关设备触头温度监测一直是电力设备故障诊断的重大课题之一,为了准确把握高压开关设备触头温度监测技术的研究现状及未来研究方向,文中将现有的高压开关设备触头温度监测方法进行了归纳分类——超温监测技术、电子式测温技术、红外辐射测温技术、红外热诊断技术、光纤光栅测温技术、光纤半导体测温技术及分布式光纤测温技术,并分别介绍了这些方法的基本原理和特点,梳理了各方法在高压开关设备触头温度诊断中的研究进展,指出了现有各测温技术优点与不足。最后,对高压开关设备触头温度监测还需解决的几个关键问题进行总结 ...
陈强   +4 more
doaj  

高温下高强钢连接的高强螺栓预紧力研究

open access: yesJianzhu Gangjiegou Jinzhan, 2023
高强钢在建筑结构中的应用越来越广泛,高强螺栓连接是钢结构常见的连接方式。火灾作用下,高强螺栓的预紧力由于钢材强度退化、热膨胀变形和高温蠕变的影响会发生变化,从而影响连接的抗剪承载力。为探明高强钢连接的高强螺栓预紧力在高温下的变化规律,利用有限元软件ABAQUS建立了单个高强螺栓连接节点模型,分析了螺栓连接在高温下的预紧力变化,采用试验数据进行了验证。进而分析了螺栓规格、连接板厚度、钢材强度和升温速率四种参数对高强螺栓最大预紧力和预紧力完全丧失时温度的影响。分析表明:在ISO-834标准升温下 ...
王卫永, 张亿发
doaj  

Bi/Bi2O3 Nanoparticles In Situ Embedded in Carbon as Anode Materials for Fast and Long‐Lasting Sodium–Ion Storage

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Bismuth anode materials are considered promising anode candidates for sodium–ion batteries (SIBs) due to their high theoretical capacity and appropriate working potential. Nevertheless, the significant volume expansion that occurs during the cycling process restricts its broader application in sodium–ion storage. Herein, Bi/Bi2O3 nanoparticles
Jiaju Lu   +3 more
wiley   +1 more source

Force-induced phase behavior of polymer chains(外力诱导下的高分子链相变)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2009
采用nPERMis(new pruned-enriched rosenbluth method with importance sampling)算法,研究了吸附在表面的高分子链在外力诱导下的相变行为.以链长N = 60的高分子链为例,在外力的作用下相变临界温度比没有外力作用的相变临界温度要低,并随外力的增大相变临界温度降低,但比热容峰值会增大.当外力f= 1.0或者1.5时,在高温区域高分子链形状发生较大变化,但在低温区由于高分子链内部相互作用和界面的吸附作用 ...
YANGZhi-yong(杨志勇)   +1 more
doaj   +1 more source

Using porous metals to enhance heat transfer in phase change materials (PCMs) [PDF]

open access: yes, 2011
Heat transfer enhancement mechanism of Phase Change Materials (PCMs) by high-porosity metal foams was investigated in this study. The Darcy-Brinkman-Forchheimer modified flow model was employed in the numerical simulations to consider the non-Darcy ...
Tian, Y. (Yuan), Zhao, Changying
core  

Application‐Grade TiAl Single Crystal With Excellent Room‐Temperature Plasticity and Strength Prepared by Seeded Electromagnetic Confinement Directional Solidification

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT In this study, a newly developed seeded electromagnetic confinement directional solidification (EMCDS) technique was employed to fabricate large‐scale TiAl single crystal ingots with a diameter of 32 mm, overcoming the long‐standing size limitations that have hindered their industrial application.
Wei Wang   +9 more
wiley   +1 more source

降低高铝陶瓷烧结温度的途径

open access: yesDianci bileiqi, 1998
传统的高铝瓷配方烧成温度偏高、能耗大、成本高、价格贵。现新研究的低温烧结高铝瓷配方,烧成温度比传统同类型高铝瓷降低150~200℃,主要性能指标均达到国家标准。采用这种新技术,估计可节能三分之一,成本可降低四分之一。本文简要介绍降低高铝瓷烧结温度的途径。
江崇经
doaj  

A study on the interaction between ground-air temperature differences over the Qinghai-Tibet Plateau and sea surface-air temperature differences over the Indian Ocean(青藏高原地气温差与印度洋海气温差的相互影响)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2018
青藏高原和印度洋均对我国气候有重要影响,研究高原和印度洋的热力状况及其耦合关系对全面了解我国的天气现象具有重要意义.利用1981 — 2010年(30 a)欧洲中心ERA-interim的青藏高原和印度洋温度资料,以及NCEP/NCAR的垂直速度和风速资料,分析了青藏高原地气温差和印度洋海气温差的特征及其相互影响.结果表明,高原冬、夏季地气温差有所区别:冬季地气温差呈东北-西南向的带状分布,在高原中部、西南边界喜马拉雅山脉地区和东南边界出现了较大的负值中心,其他地区均为正值;夏季地气温差均为正值 ...
SHENZiwei(申紫薇)   +2 more
doaj   +1 more source

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