Results 11 to 20 of about 260,471 (155)
Guangtongxin yanjiu, 2007 为实现对雪崩光电二极管（APD）增益温漂的动态偏压补偿,设计了高精度的ADC和DAC电路系统,对APD可以达到毫伏级的偏压控制精度和0.2℃的温度采样精度。依托光纤传感系统并运用数据采集与处理技术获得了在APD增益比较稳定的条件下其偏压与温度之间的线性关系以及增益温漂误差的偏压补偿公式,应用时传感系统能够实时补偿增益的温漂并且具有足以满足系统要求的补偿精度。
魏康林, 高小新
doaj +2 more sources
InGaAs/InGaAsP/InP SAGM—APD暗电流与光倍增因子的温度特性
Guangtongxin yanjiu, 1990 本文论述了暗电流I和光倍增因子Mp与温度T的关系,并测量了InGaAs/InGaAsP/InP SAGM-APD的暗电流—温度变化率与Mp-T特性。当温度由20℃升至90℃时,暗电流将增大10～30倍;而由20℃升至60℃时,光倍增因字Mp将减小1/3左右。文中还建议以严格的高低温循环来淘汰可能早期失效的SAGM-APD管芯。
丁国庆
doaj +2 more sources
Guangtongxin yanjiu, 2012 实用的L波段EDFA（掺铒光纤放大器）常采用多段铒纤和多泵浦的复杂结构。对一种复杂结构的L波段EDFA的温度特性进行了实验研究,发现在不同的输入光功率下,L波段短波侧（约1 570～1 582nm）的增益谱可按相反的方式随温度而变化,并从理论上解释了此现象。实验结果表明,铒纤的温度和增益斜率之间仍然存在很好的线性关系。控制铒纤温度就可以调整L波段EDFA的增益斜率,获得平坦的增益。
胡永刚, 义理林, 陈险峰
doaj +2 more sources
An urban evolved invasive plant tolerates experimental climate change
PLANTS, PEOPLE, PLANET, EarlyView.Urbanization may drive invasive species evolution, resulting in greater invasion risks as global conditions change. We compared urban populations of the invasive Erigeron annuus in Zagreb, Croatia, to surrounding rural populations and found that urban‐evolved populations were more tolerant of experimental warming and drought than rural populations ...
S. Luke Flory +4 more
wiley +1 more source
, 2019 介绍了大温差温湿度独立控制动态冰蓄冷系统的系统原理和运行状态,并以广东省东莞市某超高层建筑为例,对空调系统设备选型、设备配电和运行节能经济性进行了分析,指出动态冰蓄冷系统的应用为新风深度除湿和大温差供冷创造了条件,送风含湿量低于6 g/kg,且年转移电量占比达39.40%;指出大温差低温供冷和高温供冷的应用为超高层建筑带来显著的节能、节费效果,年节省运行电量120.19万kWh,在东莞市优惠峰谷电价差下运行2 ...
王志强, 董凯军, 孙钦, 苏林
core +5 more sources
Wildlife Letters, EarlyView.Climate change drives shifts in suitable habitats for Eurasian lynx and its prey (hare, roe deer) in Mohe, Daxing'anling Mountains. Under RCP scenarios, moderate warming (RCP4.5) promotes substantial habitat expansion, while high‐emission conditions (RCP8.5) lead to strong expansion in the 2050s but slower gains and partial contraction by the 2070s ...
Binglian Liu +5 more
wiley +1 more source
Intact coastal nursery rearing amid climate‐driven phenological shifts in threatened salmon
Conservation Biology, EarlyView.Abstract Literature linking phenology to climate has proliferated in recent decades and shows that climate change has reorganized seasonal opportunities worldwide. However, this literature often quantifies changes in point measures of timing (e.g., beginnings and peaks) without context about duration (e.g., rearing season length) or performance (e.g ...
Stuart H. Munsch +8 more
wiley +1 more source
Beyond Evidence: How Framing Shapes Public Health Policies During Health Crises
Policy Studies Journal, Volume 54, Issue 4, November 2026.ABSTRACT Does the level of evidence that accompanies policy action depend on how a problem is framed, and on who frames it? This article examines these questions in the context of health crises. Bridging sociological and equivalence framing theories, it treats frames as preexisting interpretive schemes shared within communities of actors, whose ...
Antoine Claude Lemor, Eric Montpetit
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Systematic studies on the fatigue deformation and damage mechanisms of nickel‐based single‐crystal superalloys (Ni‐SXs) under combined thermal and mechanical conditions remain limited, particularly regarding the influence of strain amplitude on the relative contributions of fatigue and oxidation damage.
Liyin Zhang +7 more
wiley +1 more source
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Developing rapid, precise gas sensors for Listeria monocytogenes (LM) biomarker detection faces challenges due to suboptimal gas‐solid interactions. Herein, we report the rational synthesis of amino‐functionalized mesoporous SiO2 hollow nano‐doughnuts (MS‐2‐NH2‐2) via modification with (3‐aminopropyl) trimethoxysilane (AAPTMS), which enables ...
Xingyu Wang +7 more
wiley +1 more source