Results 61 to 70 of about 24,495 (196)

黑龙滩水库消落带植被恢复模式对土壤水稳性团聚体组成及其稳定性的影响

open access: yesShuitu Baochi Xuebao
[目的] 为阐明水库消落带不同植被恢复模式对土壤水稳性团聚体组成及其稳定性的影响。[方法] 以川中丘陵区黑龙滩水库消落带人工恢复与自然恢复植被下的土壤为研究对象,利用湿筛法测定分析土壤水稳性团聚体组成特征及其稳定性指标。[结果] 消落带土壤>0.25 mm水稳性大团聚体含量与未淹水对照相比降低4.21%,其中,自然恢复植被下土壤水稳性大团聚体含量较对照下降12.27%,人工恢复植被下大团聚体含量较对照增加3.84%;不同植被恢复模式下土壤水稳性团聚体组成差异显著(p<0.05 ...
白芹菲   +5 more
doaj  

光纤中的交叉相位调制不稳定性研究

open access: yesGuangtongxin yanjiu, 2008
在同时考虑四阶色散和五阶非线性的情况下,以扩展的非线性薛定谔方程为基础,研究了有损光纤中双光束交叉相位调制(XPM)不稳定性。结果表明:由于四阶色散的影响,在光纤的正、反常色散区,XPM所致的调制不稳定性可发生在两个频谱区;正、负五阶非线性的存在分别对XPM不稳定性起加强和减弱作用。
杨慧敏, 朱宏娜
doaj  

部分包裹钢-混凝土组合轴压柱整体稳定性能及设计方法

open access: yesJianzhu Gangjiegou Jinzhan, 2023
为研究部分包裹钢-混凝土组合轴压柱的整体稳定性能与设计方法,完成了两个试件的试验。利用有限元软件ABAQUS建立部分包裹钢-混凝土组合柱数值分析模型,并对比试验数据校核模型准确性。利用该数值模型进行参数分析,考虑材料强度、组合柱长细比、含钢率、纵筋和系杆的布置对该类轴压构件整体稳定性能的影响,分别获得不同因素影响下构件绕强轴和绕弱轴的极限承载力。结果表明,材料强度、系杆间距及含钢率对稳定性能的影响均较为显著,纵筋对轴压稳定性能的影响可以忽略。基于数值模拟结果,按照不同含钢率进行归类分析 ...
兰寒枫   +5 more
doaj  

Broad‐Spectral Response Lead Halide Perovskite Solar Cells Through Integration of Multifunctional Organic Bulk‐Heterojunction and Quantum‐Cutting Downconversion Materials

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Expanding near‐infrared (NIR) spectral response and utilizing ultraviolet (UV) photons are effective strategies for enhancing the power conversion efficiency (PCE) of lead halide perovskite solar cells (PSCs). However, the range of NIR spectral response extension and the utilization of UV light for devices are not enough, and the loss of ...
Li He   +9 more
wiley   +1 more source

人血清假性胆碱酯酶连续监测法测定方法学的建立及其在肝功能评价中的应用

open access: yesZhongguo shiyan zhenduanxue, 2003
目的 建立一种稳定的人血清假性胆碱酯酶速率测定方法。方法 测定反应的初速度 ,对反应体系的最佳pH、离子强度、底物用量进行选择 ,并对所建立方法的性能 ,包括试剂的稳定性进行评价。结果 采用双试剂连续监测法测定假性胆碱酯酶的活性 ,试剂I的最适组成 :含 0 .2 5mmol/LDNTB的磷酸盐缓冲液 (80mmol/L ,pH 7.7) ;试剂II的最适组成为 :含 6 0mmol/L碘化正丁酰硫代胆碱水溶液。液体试剂于 4℃储存至少可以稳定一年。本法测定线性可达 12 0 0 0U/L ...
杨宏云, 徐国兵, 夏铁安
doaj  

Bottom‐Up Strategy Toward 3D Porous MXene/MoS2 Nanosheets/Graphene Nanoarchitectures as Highly‐Efficient Hydrogen Evolution Electrocatalysts

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT As a core component in the electrochemical water splitting system, the cathode catalyst is capable of boosting the kinetics of the hydrogen evolution reaction (HER), while the scarcity and expenditure of current noble metal‐based electrocatalysts seriously restrict the large‐scale commercial development of hydrogen manufacturing devices. Here,
Haiyan He   +8 more
wiley   +1 more source

High‐Temperature Stable Narrowband Near‐Infrared Phosphor‐Converted Light‐Emitting Diode Based on Melt‐Grown CsPbCl3: Yb3+ Crystal

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Narrowband near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) featuring low full‐width at half maximum (FWHM) and high conversion efficiency are crucial for chemical content evaluation, light therapy, and bioimaging.
Chunshen Li   +4 more
wiley   +1 more source

Genome instability and lymphoma. [PDF]

open access: yesZhong Nan Da Xue Xue Bao Yi Xue Ban, 2021
Cao P, Li G, Xiang J.
europepmc   +1 more source

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