Results 51 to 60 of about 167,960 (336)
AN “INSTRUMENTAL”Æ ESTHETICS OF MUSIC1 [PDF]
The Musical Quarterly, 1922 n ...
openaire +2 more sources
Connecting the dots: Network structure as a functional trait in arbuscular mycorrhizal fungi
PLANTS, PEOPLE, PLANET, EarlyView.Soil health and sustainable land management are critical to addressing global challenges such as food security, climate resilience, and biodiversity loss. Arbuscular mycorrhizal (AM) fungi form underground networks that enhance plant nutrient uptake and improve soil structure, yet their functional diversity remains poorly understood, limiting their ...
Carlos A. Aguilar‐Trigueros, Adam Frew
wiley +1 more source
PLANTS, PEOPLE, PLANET, EarlyView.The steppe is facing an increase in soil erosion, which is threatening the ecosystem and agricultural production. Our study reveals how grazing intensity and rainfall exacerbate soil erosion that is leading to a gradual loss of soil nutrients. This study raises a warning to both herders and policymakers that focusing on grazing without considering the ...
Liyuan Shi +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2008 从保证厂房柱列纵向稳定性的角度,对柱顶撑杆的设计要求进行了研究。采用蒙特卡罗方法,考虑实际工程中柱子和柱顶撑杆初始缺陷的随机遇合,应用有限元程序ANSYS对承受竖向荷载作用的柱列纵向支撑体系进行了大量的仿真分析,得到了柱列纵向支撑体系的三种失稳模式;通过概率统计得到柱顶撑杆所受内力的三峰正态概率密度函数,发现柱子和撑杆初始缺陷的随机遇合作用导致柱顶撑杆受压、拉或零受力的随机性,降低了支撑力,据此确定了可用于实际工程设计的支撑力的大小,为传统的柱顶撑杆由纵向受力决定的设计方法补充了竖向受力分析的验算方法。
赵金友, 张耀春, 张文元
doaj
PLANTS, PEOPLE, PLANET, EarlyView.Alfalfa is the most widely cultivated perennial forage crop in the world, supporting livestock production and contributing to global food systems. However, soil degradation and declining productivity threaten the long‐term sustainability of alfalfa pastures.
Martina Cardoni +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan为了研究大高宽比矩形钢管混凝土柱的压弯性能，对大高宽比钢管混凝土短柱进行偏压试验并结合有限元模拟补充了4组试件进行对比，包括不同偏心率、高宽比、钢管壁厚度、截面尺寸情况下柱性能的对比分析。最后参考常用的4本国内外规范进行柱承载力计算，对比并判断现有规范是否适用。结果表明：试件破坏模式均为长边鼓曲，当荷载小于极限承载力的80%时，横截面高度上的应变分布服从平截面假定；随着偏心率增大柱延性先提升，在偏心率超过0.205后，柱延性开始下降；随着壁厚增加柱延性先提升，在壁厚达到8 mm后，柱延性开始下降 ...
陈安英 +4 more
doaj +2 more sources
Jianzhu Gangjiegou Jinzhan, 2009 本文研究了对摇摆柱提供支持的框架柱的稳定性。结果表明,存在摇摆柱的情况下,框架柱的稳定系数,除了采用放大了的长细比确定外,还要适当降低柱子曲线。通过有限元分析对比,本文建议了一个修正的缺陷因子,在现行压杆稳定系数b曲线的计算公式中应用。本文考察了带摇摆柱框架的总的承载力。结果表明,虽然摇摆柱的侧向稳定承载力是由框架柱提供的,但是在框架柱的长细比小时,总的承载力远远超出框架柱本身的稳定极限承载力。这说明,摇摆柱的承载力是由框架柱的抗侧刚度提供的,柱子长细比小的框架柱的抗侧刚度较大 ...
童根树, 黄山, 饶芝英
doaj
Strangers on the ladder of the party‐state: Women in teaching in Nationalist Taiwan, 1940s–1980s
Gender &History, EarlyView.Abstract As the ruling party of a party‐state in China and Taiwan, the Nationalist Party (Kuomintang/Guomindang) built a close relationship with the teaching profession. Many teachers joined the party and there was a well‐trodden pathway from teaching into local representative politics and civil service.
Joseph Lawson
wiley +1 more source
火灾下非均匀受火钢柱截面温度分布规律及其对钢柱抗火性能影响的研究现状
Jianzhu Gangjiegou Jinzhan, 2011 本文介绍了火灾下非均匀受火钢柱截面温度分布规律及其对钢柱抗火性能的研究进展和已有研究成果,包括钢柱截面非均匀温度分布产生的原因及截面温度非均匀分布对钢柱抗火性能的影响。钢柱截面不均匀温度产生的原因有:钢柱受到建筑填充墙保护,非4面受火;钢柱仅部分截面采用防火保护;受洞口非均匀火灾影响的建筑外框架柱;钢柱防火保护层不均匀或局部破损等。截面温度不均匀对钢柱抗火性能的影响包括:截面产生附加应力,使钢柱临界温度降低;钢柱截面不对称,发生弯扭破坏;钢柱产生热弯曲,以及破坏时可能出现的反向弯曲等 ...
潘锦旭, 张盛亚, 王培军
doaj
青葉山周辺から産する鉱物標本の産出層準－ 仙台地域の地学教材の基礎資料 － [PDF]
, 2019 Mineral specimens occurring around the Aobayama Hill have been utilized as scientific study objects, also as familiar geology-teaching materials in the Sendai area.
佐藤 奈月 +4 more
core +1 more source