Results 21 to 30 of about 12,397 (195)
Guangtongxin yanjiu, 1993 本文介绍光纤局部区域网构网的一种关键器件——由2×2光纤耦合器和光纤环组成的反射型单模光纤星形耦合器的构造方法及特点。对光纤环的反射特性与耦合特性关系作理论分析。最后,报道了研制的反射型单模光纤8端口星形耦合器的实验结果。
叶爱伦, 徐毅青
doaj
Effect of potassium nutrition on photosynthetic characteristics of small Cushaw [PDF]
, 2005 利用CIRAS-2型便携式光合测定系统,研究不同钾素营养水平下小南瓜的光合特性。结果表明：小南瓜叶片的蒸腾速率、气孔导度、净光合速率的日变化与钾素营养之间呈显著的正相关(r值分别为0.965 1、0.816 0、0.926 9),细胞间隙中C0_2浓度日变化与钾素营养之间呈显著的负相关(r=0.847 9)。The photosynthetic characteristics of small Cushaw at different potassium levels was measured by ...
彭国良, 曾志杰, 杨盛昌
core
Effect of different light qualities on photosynthetic characteristics and fruit quality of Shine Muscat grapevines grown under rain-sheltered cultivation [PDF]
[Objective] Light serves as a pivotal environmental regulator in plant morphogenesis and physiological adaptation. Under grape facility cultivation, particularly with rain-shelter systems, insufficient light frequently constrains photosynthetic ...
CHEN Guangxia +9 more
core +1 more source
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Additively manufactured AlCoFeNi series eutectic high‐entropy alloys (EHEAs) exhibit nonequilibrium dual‐phase microstructure in the as‐printed state, allowing them to be easily tailored through annealing to explore their strength–toughness potential.
Huidong Wu +13 more
wiley +1 more source
Guangtongxin yanjiu, 2000 利用光纤 -线性啁啾光纤光栅进行光脉冲的压缩 ,首先讨论了线性啁啾光纤光栅的色散特性 ,并给出耦合系数为反高斯函数的线性啁啾光纤光栅的色散特性 ;然后利用此种光纤光栅与正常色散光纤结合进行光脉冲的压缩 ,通过理论和数值分析 ,得出一简单设计规则 ;最后利用此规则设计一个压缩因子为 1 0的光纤 -线性啁啾光纤光栅压缩器。
林宁, 张晓光, 俞重远, 杨伯君
doaj
Guangtongxin yanjiu, 2020 针对填充液体的光子晶体光纤温度传感器灵敏度较低的问题,文章提出了一种基于模式耦合的高灵敏光子晶体光纤温度传感器,光子晶体光纤的纤芯作为传光通道,填充液态乙醇和氯仿的液芯作为耦合通道,当纤芯与液芯发生模式耦合时,纤芯的限制损耗谱会出现一个狭窄的损耗尖峰。损耗峰的位置随温度的变化而漂移。光子晶体光纤的纤芯和液芯相互独立,可以分别调整其传输特性。利用有限差分算法对传感器的特性进行了仿真研究,结果表明,设计的光纤结构具有良好的温度传感特性,耦合波长随温度升高而红移,在10～35℃范围内 ...
曾维友, 王晴岚, 徐利
doaj
Effects of rain-shelter cultivation on leaf photosynthetic characteristics and fruit quality in pear [PDF]
[Objective] Rain-shelter cultivation has been widely implemented in fruit production to cope with adverse environmental stresses and enhance the fruit quality.
HUANG Xinzhong +4 more
core +1 more source
Food and Energy Security, Volume 15, Issue 2, March/April 2026.ABSTRACT Net photosynthetic rate (Pn) serves as a key indicator for evaluating plant growth and yield. In order to explore an effective method for monitoring winter rapeseed Pn using unmanned aerial vehicle (UAV) multispectral technology, the winter rapeseed was taken as the research object and the multispectral images were obtained through UAVs in ...
ChengYang Ni +7 more
wiley +1 more source
Response of Photosynthetic Apparatus to Different Irradiance in Flag Leaves of High-Yielding Winter Wheat PH01-35 Grown under Low Light Conditions [PDF]
, 2009 为了解弱光下生长的小麦叶片在不同光强下PS II和光合电子传递链的工作状态,解释其突然转入强光下时发生光抑制和光破坏的原因,以PH01-35为材料,采用大田人工遮光的方法,测定了小麦旗叶叶绿素含量、光合特性参数及快速光曲线。弱光处理15 d后,旗叶叶绿素含量明显上升,净光合速率、光补偿点、光饱和点、表观量子效率、羧化效率均出现不同程度的下降。与250μMOl M-2 S-1的弱光适应3 H相比,1 200μMOl M-2 S-1的强光适应3 H后,弱光下生长叶片的快速光曲线初始斜率下降幅度较大 ...
信长朋 +7 more
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Laser‐Driven Halide Exchange and High‐Resolution Multicolor Patterning of Perovskite Films
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Translating the excellent properties of metal halide perovskites (MHPs) into practical flexible optoelectronic devices requires high‐resolution multicolor patterning techniques that are compatible with post‐fabrication processing. However, such a capability has remained elusive.
Shu Yang +6 more
wiley +1 more source