Results 31 to 40 of about 148,126 (251)

高强冷成型钢开口截面轴压构件的高温后数值仿真与承载力研究

open access: yesJianzhu Gangjiegou Jinzhan, 2021
冷成型钢构件在经历火灾(高温)后,力学性能可能发生衰减,需要关注其承载力的变化并做出准确评估。因此,在现有高强冷成型钢过火后材性与构件测试结果的基础上,通过数值仿真模拟预测构件经历不同温度后的力学行为。通过参数分析,开展开口截面承压构件过火后性能分析,研究高温后的构件长细比、截面形式对承载力和破坏模式的影响,评估常温构件设计方法的适用性。有限元建模和参数分析的结果表明:(1)冷成型钢构件材性的衰减不是影响其过火后性能的唯一因素,在特定温度段须考虑重量折减;(2 ...
张佳慧, 孙梦茹
doaj  

コウオン ユウタイ ブッセイ ニュウモン 1 コウオン ユウタイ ノ ヒョウメン チョウリョク [PDF]

open access: yes, 2010
入門講座高温融体物性入門-
Tanaka, Toshihiro   +2 more
core  

Applying Bergmann's Rule to Species Conservation Planning 贝格曼法则在物种保护规划中的应用

open access: yesIntegrative Conservation, Volume 4, Issue 2, Page 120-125, June 2025.
Although Bergman's rule has extensively been studied, its implications in species conservation have not been clear, especially in the context of climate change (global warming). Here, we discuss the potential applications of the “rule” based on IUCN's (2022) Red List and suggest species' body size to be an important ecological indicator in future long ...
Qinfeng Guo   +4 more
wiley   +1 more source

Tree mycorrhizal associations regulate relationships between plant and microbial communities and soil organic carbon stocks at local scales in a temperate forest

open access: yesFunctional Ecology, Volume 39, Issue 6, Page 1550-1566, June 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Forests store substantial amounts of soil organic carbon (SOC), but SOC stocks differ strongly between forest ecosystems dominated by arbuscular mycorrhizal (AM) or ectomycorrhizal (EcM) fungi.
Mengxu Zhang   +10 more
wiley   +1 more source

2013年夏季异常晴热高温天气的成因分析 Analysis of Abnormal High Temperature Causes in the Summer of 2013

open access: yes, 2014
2013年7月到8月中旬我国南方地区遭遇60年来最强一次晴热高温酷暑天气,这次高温天气具有强度强、影响范围大、持续时间长、降水量少等特点。本文对此次高温天气的特点及出现的原因进行分析,发现强大的副高控制是高温天气出现的直接原因,但夏季极涡的位置、冷空气的活动、降水量、台风的活动频数、梅雨量和青藏高原积雪等,它们均对副高强度和位置产生作用,从而影响高温天气的出现。 From July to mid August in 2013, southern China suffered the strongest
素清 项, 素芳 舒, 丽萍 何
semanticscholar   +1 more source

Experimental investigation of Phase Equilibria of Partial Ternary systems with Rhenium [PDF]

open access: yes, 2016
摘要 镍基高温合金具有高强度、优良的耐热性和良好的耐腐蚀性,被广泛应用于航空航天、国防军事、核能等重要领域。迄今为止,镍基高温合金的添加元素达到了十多种,熔点高、原子半径大的元素如Co,Re,Ru,Mo,W等的添加,能起到很好的固溶强化作用,改善高温力学性能。然而高熔点元素的过量添加导致拓扑密排相的产生,降低镍基高温合金的疲劳寿命、塑性、韧性等力学性能。相图作为合金设计的基础,能够很好的指导镍基高温合金的成分设计。然而,由于Re,Ru,W等元素价格贵,熔点高,对其进行实验研究比较困难。截至目前,由Co ...
杨晓锋
core  

Early parent‐child interaction and home environments of children exposed prenatally to opioids: A comparison of biological mothers and out‐of‐home caregivers

open access: yesInfant Mental Health Journal: Infancy and Early Childhood, Volume 46, Issue 3, Page 343-358, May 2025.
Abstract Children born to mothers with opioid use disorder (OUD) are at increased risk of maltreatment and out‐of‐home care (OOHC) placement. This study examines the parent‐child interaction quality and home environments of 92 New Zealand children with prenatal opioid exposure (OE) and 106 non‐opioid‐exposed (NE) children.
Samantha J. Lee   +2 more
wiley   +1 more source

2013 年北大西洋破纪录高海温与我国江淮-江南地区极端高温的关系

open access: yes, 2014
2013 年7 月,我国江淮-江南地区持续高温,多个地区气温打破历史纪录,影响重大. 本文从气候学的角度开展了其归因研究,结果发现在2013 年7 月,北大西洋中纬度地区海温持续偏高,打破160 年的历史纪录,海温的异常通过遥相关波列与东亚上空纬向西风和西太平洋副热带高压产生联系,进而可能影响到我国江淮-江南地区夏季气温的变化,这可能是造成该地区2013 年7 月破纪录高温事件的重要原因. 对于江淮-江南地区的极端高温,一般关注的是西太平洋副热带高压的影响.
孙建奇
semanticscholar   +1 more source

金属材料の高温における強化に関する研究 : 積層強化と固溶強化 [PDF]

open access: yes
1 序論 2 人工積層複合材料の熱疲労 3 人工積層複合材の高温変形 4 固溶硬化合金の高温変形機構の判別 5 固溶硬化合金の高温変形挙動の予測 6 総括Made available in DSpace on 2012-07-04T00:27:37Z (GMT). No. of bitstreams: 1 morikawa.pdf: 10990885 bytes, checksum: 97260881f2922be6c3b3a89adcdcae30 (MD5) Previous issue date:
Morikawa, Tatsuya, 森川, 龍哉
core   +2 more sources

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

Home - About - Disclaimer - Privacy