Results 51 to 60 of about 707,699 (138)

Monitoring population extinction risk with community science data

open access: yesJournal of Applied Ecology, Volume 62, Issue 9, Page 2133-2147, September 2025.
Our modelling framework provides a robust, computationally efficient and easy‐to‐apply tool for monitoring local persistence probability that can support global conservation efforts. This will complement the monitoring of species population viability in places where standardized monitoring is still lacking, but community science observations are common.
Orlando Acevedo‐Charry   +8 more
wiley   +1 more source

WASP水质模型在表流人工湿地中的优化与应用

open access: yesGongye shui chuli, 2018
首次对WASP(water quality analysis simulation program)水质模型进行优化来模拟预测表流人工湿地的水质变化。由于表流人工湿地中水生植物吸收和微生物降解作用的显著增强,通过模型率定所得WASP模型水力学、植物、生化反应的相关参数值明显高于模拟天然水体时的推荐值。对改进后WASP模型的验证结果表明,湿地水质(COD和NH4+-N)模拟值与实测值基本吻合,证明改进后的WASP模型能够有效模拟预测表流人工湿地的水质变化。
陈德坤, 朱文博, 王洪秀, 梁爽
doaj   +2 more sources

承压水底板失稳过程的数值模拟 [PDF]

open access: yes, 2001
利用自行开发的岩层破断过程分析系统 ,对承压水底板的失稳过程进行了数值模拟。根据模拟结果 ,分析了承压水底板失稳的机理 ,对承压水底板的突水部位进行了预测。通过与理论分析方法和实验的对比 ...
唐春安, 刘红元
core   +2 more sources

从土壤持水数据估算导水率方法的比较分析

open access: yesShuitu Baochi Xuebao, 2001
根据一些常用的土壤持水经验模型(VG模型、BC模型和CP模型)推求用于估算非饱和导水率函数的表达式,并采用田间实测的导水率数据与模拟估值进行对比.结果表明这些估算模型适宜用来描述细质地以上土壤的非饱和导水特性,且VG模型的估值效果要好于其他模型.当满足使用条件时,间接估值法可获得较好的模拟估值精度.
许迪 Mermoud A
doaj  

Automated multivolume placental reconstruction using three‐dimensional power Doppler ultrasound and infrared camera tracking

open access: yesUltrasound in Obstetrics &Gynecology, Volume 65, Issue 5, Page 624-632, May 2025.
ABSTRACT Objectives Placental insufficiency contributes to many obstetric pathologies, but there is no bedside clinical tool to evaluate placental perfusion. We have developed a method to acquire multiple three‐dimensional (3D) power Doppler (PD) ultrasound (US) volumes of placental vasculature, with infrared camera tracking of the precise spatial ...
A. Xue   +5 more
wiley   +1 more source

湍流的直接数值模拟及可压缩效应

open access: yes, 2003
针对湍流的直接数值模拟,分析了正确模拟多尺度湍流流场对空间步长和步长雷诺数的限制条件。讨论了湍流激波束的捕捉问题,指出,合适的耗散型差分格式有利于湍流马赫数较高时的数值模拟。文中以可压平面混合流、圆形射流和均匀各向同性湍流的直接数值模拟结果为基础,分析了可压缩效应对大尺度拟序结构和湍动能的生成及耗散特征的影响。最后讨论了“内在可压缩性 ...
马延文, 傅德薰
core   +2 more sources

Simulating the efficacy of wolf–dog hybridization management with individual‐based modeling

open access: yesConservation Biology, Volume 39, Issue 1, February 2025.
In the photo, an introgressed adult wolf–dog in the Northern Apennines, Italy, not far from the city of Bologna. Part of a research program, this male has been sterilized and released back in its own pack with a Global Positioning Collar. Abstract Introgressive hybridization between wolves and dogs is a conservation concern due to its potentially ...
Nina Luisa Santostasi   +4 more
wiley   +1 more source

波浪增减水的实用数学模型及其数值模拟

open access: yes, 2002
提出了一种模拟近岸区波浪增减水的实用数学模型。首先采用考虑波能损失的抛物型缓坡方程数值模拟波浪破碎引起的波浪复振幅变化,接着根据计算得到的波浪复振幅,采用一种新的辐射应力公式计算辐射应力分量,然后采用深度平均方程计算波浪破碎产生的增减水。采用该模型对规则波和不规则波破碎引起的增减水进行了数值模拟,数值模拟结果与实验结果吻合良好 ...
郑永红, 沈永明
core  

NaClO_3晶体生长过程光学诊断与数值模拟

open access: yes, 2006
运用光学干涉诊断方法实时观测NaClO3晶体生长过程,得到晶体生长过程中溶液浓度,晶体尺寸等物理参量.将这些参量与数值模拟得到的结果进行比对,研究重力条件下NaClO3晶体溶液生长过程中速度场、浓度场的分布与演化,尝试提出符合实际情况的晶体生长理论模型.对比两种方法得到的浓度边界层厚度 ...
段俐, 王涛
core   +2 more sources

椭圆型缓坡方程的微机群集并行数值模拟

open access: yes, 2003
提出了椭圆型缓坡方程的一种并行数值模拟方法,并在微机群集并行系统上进行了数值实现。为了验证方法的精度和效率问题,对两种典型缓坡地形上的波浪传播变形进行了数值模拟。与对应的串型算法得到的结果比较表明,本文的并行数值方法不仅可以提高数值模拟效率,而且可以大大减少单机的存储容量 ...
游亚戈, 郑永红, 沈永明
core  

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