Results 81 to 90 of about 167,960 (336)
異型花柱性植物サクラソウとシロバナサクラタデにおける柱頭の高さの変異とそれが雌性繁殖成功に及ぼす影響 [PDF]
, 1999 Thesis (Ph. D. in Science)--University of Tsukuba, (A), no.
Nishihiro Jun, 西廣 淳
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Fungal guild interactions slow decomposition of boreal forest pine litter and humus
New Phytologist, EarlyView.Summary Ericaceous understory shrubs and ericoid mycorrhizal fungal communities are ubiquitous in boreal forests, and their interactions with ectomycorrhizal and saprotrophic fungi may determine organic matter dynamics in forest soils. We followed decomposition of pine needle litter and mor‐layer humus over 3 yr in a factorial shrub removal‐ and pine ...
Louis A. Mielke +5 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2018 针对外露式钢柱脚低层钢框架动力响应机理不明的情况,在提出外露式钢柱脚滞回曲线模型的基础上,以首层剪重比、钢柱脚强度系数及框架形状等为主要研究参量,建立16个3层规则钢框架模型,采用弹塑性方法进行了研究,结果如下:当首层剪重比值从0.30提高为0.35时,对低层钢框架结构首层变形及塑性能量集中等有较好的缓和效果,钢柱脚强度系数越小越明显;外露式钢柱脚耗能效果不显著,但外露式钢柱脚在塑性滑移过程中能够把地震输入能量转移到其它构件;外露式钢柱脚动力响应滞回曲线的形状 ...
包恩和, 王天成, 李琦
doaj
New Phytologist, EarlyView.Summary Interactions between plants and soil microbes are widespread and are documented to modulate plant–insect herbivore interactions. Still, it remains unclear how these shape the overall plant defense responses and the mechanisms in suppressing insect populations.
Crispus M. Mbaluto, Sharon E. Zytynska
wiley +1 more source
Jianzhu Gangjiegou Jinzhan提出了一种轻钢-钢纤维再生混凝土组合柱，为研究组合柱的轴心受压性能，设计了5组不同构造短柱试件进行轴压试验，包括1组型钢试件和4组组合柱试件。以截面构造、钢纤维掺入量和再生混凝土强度为变化参数，研究不同参数对组合柱破坏特征、荷载-位移曲线、承载力、刚度、延性的影响。结果表明：提出的轻钢-钢纤维再生混凝土组合柱构造可以改善轻钢柱的稳定性能，显著提高轻钢柱的承载能力；轻钢-钢纤维再生混凝土组合柱的承载能力随着钢纤维掺入量的增加而提高，钢纤维可约束再生混凝土裂缝开展，改善试件损伤和刚度退化 ...
边瑾靓 +4 more
doaj +2 more sources
Jianzhu Gangjiegou Jinzhan, 2009 本文先针对轴心受压杆件,阐述了Euler临界力、计算长度、P-δ效应、稳定系数(柱子曲线)等重要概念及它们之间的关系;进而论述了框架柱计算长度概念;再通过说明我国现行《钢结构设计规范》(GB50017)中压弯杆件极限承载力验算式的来源,阐明了进行框架柱验算时,考虑P-Δ效应进行结构二阶内力分析与柱计算长度选取间的关系。最后,本文提出了对框架柱进行承载力验算及柱计算长度选取的建议。
李国强
doaj
中西医结合护理Objective To evaluate the application effect of objective structured clinical examination (OSCE)-based advanced assessment combined with multimodal teaching methods in clinical nursing teaching, and provide a basis for improving teaching quality ...
DENG Lijun (邓丽君) +4 more
doaj +1 more source
Æ E Æ Å – Reshaping the Role of Træna Fishermen
, 2022 This diploma project aims to strengthen the viability of Træna’s community by proposing an ocean research facility in the archipelago, enabling the next generation of local fishermen to collect oceanographic data while working at sea. The idea of the fisherman as oceanographer is inextricably linked to the architectural program on the island of ...
openaire +1 more source
Impact Resistance Evaluation of Pier Structures Subject to Corrosion in Marine Environments [PDF]
, 2016 考虑大量桥梁未设置安全岛或其它类型的防撞设施，桥墩客观存在着船撞的风险，并可能因为船撞产生局部破坏甚至整体倒塌。与此同时，桥梁还不可避免地受到腐蚀引起的性能退化，特别是海洋环境下钢筋混凝土桥梁出现的腐蚀劣化问题尤为突出。目前对于旧桥的抗冲击性能评估，鲜有学者考虑结构腐蚀劣化带来的影响，这可能造成评价结果偏于不安全。因此，有必要细致考虑腐蚀因素对桥墩柱性能的影响，在此基础上，进一步分析墩柱腐蚀对其抗冲击性能的影响。 本文首先根据结构腐蚀劣化的机理及其对桥墩柱结构的危害，确定结构腐蚀退化因素 ...
王永辉
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