Results 61 to 70 of about 167,960 (336)
Conservation Biology, EarlyView.Abstract Urgency to save species from extinction has prompted increased investment in law enforcement in protected areas. To date, such law enforcement has largely focused on increasing costs and reducing opportunities for offending. However, these resource‐intensive approaches are not always effective and can contribute to conflict between people and ...
Freya A. V. St. John +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2005 本研究进行两组“大尺寸梁柱接头”之反复载重试验,以探讨其力学行为与耐震性能。本研究之试体采用钢梁与“受钢筋混凝土包覆之箱型钢柱（简称包覆箱型钢柱或SRC柱）”接合之梁柱接头。此种钢梁与SRC柱接合之构造的主要特点,在于利用SRC柱之劲度、防火与抗压强度方面的长处,又可以发挥钢梁在韧性与施工便捷方面之优点。本研究之试体均符合“强柱弱梁”之原则且梁柱接头区之标称剪力强度均大于该区之需求剪力强度,试体之断面配置均符合台湾SRC设计规范之要求。本研究探讨之重点包含:（1）此种新型梁柱接头之钢梁塑性铰的发展情形,（
翁正强, 王晖舜
doaj
Jianzhu Gangjiegou Jinzhan, 2021 建立圆形、正方形、圆端形、六边形钢管混凝土柱在火灾下的有限元模型,利用现有试验结果验证有限元模型。基于该模型,研究保护层种类、保护层厚度、截面形状和截面周长等参数对钢管混凝土柱耐火极限的影响。分析表明,试件耐火极限随着保护层厚度和截面周长的增加而增大。厚涂型涂料的防火效果优于砂浆的防火效果。在长细比和截面周长相同的情况下,圆端形钢管混凝土柱的耐火极限高于圆形钢管混凝土柱;六边形钢管混凝土柱的耐火极限优于方钢管混凝土柱;绕强轴破坏的耐火极限略低于绕弱轴破坏的情况。基于周长等效原则,可将圆端形(或六边形 ...
王志滨 +3 more
doaj
Zhejiang Daxue xuebao. Lixue ban, 2008 研究了采用离子色谱法-柱切换进样抑制电导检测环丁砜样品中的阴离子的分析方法.采用美国Dionex公司ICS90型离子色谱仪，用9 mmol• L-1 Na2CO3淋洗.一根短柱连接在定量环中作浓缩柱，进样时，首先使低浓度的环丁砜中阴离子富集在浓缩柱中，大部分对柱子可能有损害的有机物被除去，然后再切换到分析柱中进行分离检测，可成功地测定环丁砜中的Cl-、NO3-、SO42-等痕量阴离子 ...
CHENMei-lan(陈梅兰) +3 more
doaj +1 more source
How the diversity in digestion in carnivorous plants may have evolved
New Phytologist, EarlyView.Summary Carnivorous plants secrete digestive enzymes for prey degradation. Although carnivorous plants have a polyphyletic origin and evolved several times independently, they surprisingly co‐opted similar digestive enzymes during convergent evolution.
Andrej Pavlovič
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2002 相对于传统SRC梁接SRC柱的梁柱接头而言,本研究采用钢梁接SRC柱之接头型式,尝试利用SRC柱在劲度与抗压强度之优点,并避开SRC梁在施工上的不便,初步进行了两组大尺寸试体之反复载重试验,以探讨此种型式接头之耐震行为。实验结果显示,由于两组试体之钢梁与钢柱之弯矩强度比并未满足强柱弱梁的规定(但SRC柱整体之抗弯强度仍大于钢梁之强度),因此其反复载重位移曲线并不如满足强柱弱梁的纯钢构接头饱满,而在非弹性阶段出现较明显劲度衰减的现象;但由于SRC柱接头区的混凝土对钢柱提供了良好的围束 ...
翁正强, 陈诚直, 王晖舜
doaj
New Phytologist, EarlyView.Summary Galls are structures formed by plants in response to stimuli by parasitic insects. Because galls require altered gene expression to change cell fates, their initiation requires pluripotent or ‘reactive’ cells. We used RNA sequencing to test three hypotheses about potential sources of pluripotency in the leaf gall formed by grape phylloxera ...
Jack C. Schultz +4 more
wiley +1 more source
Automated extraction of leaf mass per area from digitized herbarium specimens
New Phytologist, EarlyView.Summary The digitization of vast herbarium collections has made millions of plant specimen images freely available online, which can now be used to generate phenotypic datasets of unprecedented scope. Here, we assess the potential of computer vision tools to automate the extraction of predicted leaf mass per area (LMApred) from digitized herbarium ...
Thais Vasconcelos +4 more
wiley +1 more source
Transient Thermal Stresses in a Finite Clad Cylinder [PDF]
, 1993 This paper deals with the transient thermal stresses in a finite clad circular cylinder, which is joined two finite circular cylinders of different materials together on the ends, subjected to partially and axisymmetrically heated on the clad end.
五嶋 孝仁
core +1 more source
New Phytologist, EarlyView.Summary Perception of low irradiance ultraviolet B (UV‐B) light (280–315 nm) by the UV RESISTANCE LOCUS 8 (UVR8) photoreceptor initiates signalling pathways that enhance plant defences to UV‐B damage, mitigating the effects of higher photon irradiances.
Christopher L. Groves, Keara A. Franklin
wiley +1 more source