Results 51 to 60 of about 7,054 (156)
Robust Estimation of Muskingum Flood Routing Parameters [PDF]
, 2008 [摘要]：根据水量平衡反推计算的入库流量, 经常存在大波动的异常值。研究当流量资料受异常值污染时, 采用附 有条件的抗差最小二乘方法估计汇流模型参数的效果。运用于益塘和洈水两个水库流域, 比较了抗差最小二乘估计与 经典最小二乘估计的结果, 证明了该方法的可行性和较高的演算精度。[Abstract]:Inflow that is calculated based o n w ater balance o f reservo ir , g enera lly contains o utlier s.
HONG Hua sheng +5 more
core
Integrative Conservation, Volume 4, Issue 3, Page 362-380, September 2025.Occurrences of dust storms and long‐distance movement of dust across landscapes is constantly increasing in south Asia. This dust is expected to have profound impact on vegetation health and sustainability as dust may contribute to nutrient budgets of the forest ecosystems, while it could impart various stresses to the plants.
Shree P. Pandey +2 more
wiley +1 more source
Shuitu Baochi Xuebao, 2017 运用15N同位素示踪技术，以5年生烟富3/SH6/平邑甜茶苹果为试材，研究了不同施氮水平（0，50，100，150，200，250 kg/hm2）对营养转换期富士苹果肥料氮吸收利用、土壤残留和土壤氮库盈亏的影响。结果表明，随施氮水平的提高，肥料氮的利用率逐渐下降，且树体吸收土壤氮素的比例逐渐降低，而来自肥料氮的比例逐渐升高；施氮1个月后，5.75%～12.99%的肥料氮被树体吸收，29.62%～39.74%的肥料氮残留在0—60 cm土体中，47.27%～64.64%的肥料氮通过其他途径损失 ...
王 芬 +6 more
doaj
International Journal of Applied Linguistics, Volume 35, Issue 3, Page 1482-1494, August 2025.ABSTRACT While previous research has established nominal complexity as a key indicator of grammatical complexity, its multi‐dimensional manifestation in constrained varieties remains underexplored. This study investigates the distribution of complex nominal structures in constrained spoken English varieties, specifically English as a Second Language ...
Jiaxin Chen, Yao Yao, Dechao Li
wiley +1 more source
Shuitu Baochi Xuebao, 2000 据水量平衡原理，在集水技术基础上对黄土高原地区旱地果园不同土内蓄水保墒技术进行研究。通过测定果树植树带内土壤物理性状，定量地求算出影响根系生长的土层（0－60cm）范围内，各种蓄水保水措施的蓄水量，从而为解决干旱地区的缺水问题提供一些可行的途径。
宋吉红 王百田 等
doaj +2 more sources
Shiyou jixie, 2014 热采水平井蒸汽吞吐时水平段吸汽不均衡，造成水平段动用不均。鉴于此，对热采水平井改善吸汽剖面技术进行研究。首先，建立油藏井筒流动耦合模型及储层热流变形三场耦合模型，定量分析了油层物性参数、非均质性及注汽口位置对吸汽剖面的影响。然后，根据上述分析结果，设计了均衡注汽完井工艺管柱。该管柱可实现注采一体化及均匀注汽以及长水平段、非均质储层的均匀注采。现场应用结果表明，热采水平井改善吸汽剖面技术可以改善热采水平井长水平段的吸汽剖面，实现均衡注汽，提高水平井的动用程度。
岳慧 +4 more
doaj
Research progress in integrated groundwater-surface water models [PDF]
Groundwater-surface water interaction involves material transport and energy transfer processes, which directly impacts the hydro-ecological environment of watersheds.
Shuyan PENG +3 more
core +1 more source
The Politics of Transparency: Analyzing Online Information Disclosure in Spanish Municipalities
Politics &Policy, Volume 53, Issue 3, June 2025.ABSTRACT This study aims to evaluate the existence of a mimetic behavior model in local governments‘ online information disclosure using spatial econometrics. To analyze this behavior, the Bidimensional Transparency Index is employed, which is an e‐disclosure measurement instrument that measures the local government‘s transparency level through two ...
José‐Luis Zafra‐Gómez +3 more
wiley +1 more source
Shedding light on transparency: A comprehensive study of state‐level transparency portals in Mexico
Policy &Internet, Volume 17, Issue 1, March 2025.Abstract The growing demand for transparency and accountability on the part of citizens has positioned governmental electronic portals as crucial elements in the promotion of democracy and citizen participation. Mexico has devised an approach to assess the transparency of State Transparency Portals, yielding an annual indicator and ranking.
Javier Cifuentes‐Faura
wiley +1 more source
Robust recursive algorithm for real-time co-correction model [PDF]
, 2008 利用遥测系统实时监测水情资料,由于遥测系统自身的原因以及水文要素测量的具体要求,数据常常携带异常误差.采用有异常误差的实测流量资料对实时校正模型进行参数辨识,要求算法既能抵御异常误差的影响,又具有较强的实时跟踪能力,以适应实时洪水预报的要求.在递推最小二乘算法的基础上,引入抗差理论,削弱异常值对参数估计的影响;引入遗忘因子,实时跟踪模型时变参数的变化.计算实例表明,带有遗忘因子的抗差递推最小二乘算法对异常误差不敏感,又具有较强的实时跟踪能力.Data observed by telemetric ...
张珞平, 洪华生, 赵超
core +3 more sources