Results 61 to 70 of about 20,289 (242)
Numerical analysis of bubble growth in a molten steel/(N2,H2) supersaturation system [PDF]
, 2016 A water/carbon dioxide system was used to study bubble growth dynamics in a molten steel/(N2,H2) supersaturation system. Bubble nucleation and growth mechanism models in the aqueous solution and the molten steel were respectively established.Bubble ...
JI Yi-long +5 more
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Guangtongxin yanjiu, 1996 光频分复用（ＯＦＤＭ）充分地利用了光纤传输带宽，扩大了通信系统容量，近年来取得了很大发展。文中根据ＦＳＫ－ＦＤＭ系统特性，介绍了一种时域分析方法，进行计算机数值解，给出了接收信号的眼图。通过眼图可以直观地分析系统参数对系统的影响，得到了系统参数优化设计值。
张权, 郭建恩, 李玲
doaj
Politics &Policy, Volume 53, Issue 3, June 2025.ABSTRACT Climate change is increasing pressure on policymakers and the public to face perceived trade‐offs between economic growth and environmental sustainability, but is it possible to fulfill human needs within the ecological limits of the planet? This article investigates how the public prioritizes this trade‐off. We analyze the drivers of citizens'
Soomin Oh, David Hudson, Jennifer Hudson
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 5, Page 567-574, May 2025.ABSTRACT Objectives To assess the value of pregnancy‐associated plasma protein‐A (PAPP‐A) in screening for preterm pre‐eclampsia (PE) (delivery < 37 weeks' gestation) measured in maternal blood samples collected before 11 weeks, and to compare the screening performance of PAPP‐A with that of placental growth factor (PlGF) from blood samples collected ...
L. Rode +21 more
wiley +1 more source
, 2008 工程实际中,许多现场环境不适合应变片的粘贴、密封、养护以及工期要求等,需要将应变粘贴、养护及密封工作提前到实验室进行。点焊薄片应变传感器能够保证焊接过程中不产生引起应变片损坏的热量。通过对电阻点焊和氩弧点焊两种薄片应变传感器进行试验研究和数值分析,证明了点焊薄片应变传感器具有很好的传递性能和疲劳性能 ...
唐俊武 +3 more
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Zhejiang Daxue xuebao. Lixue ban, 2011 可控中空光束是适合于描写中央强度为零的激光束.将分数傅里叶变换用于处理可控中空光束的传输.基于广义惠更斯-菲涅耳衍射公式，导出了可控中空光束经分数傅里叶变换系统的解析传输公式.运用所得到的解析表达式，通过数值计算考查了可控中空光束在分数傅里叶变换面上的特性，分析了分数傅里叶变换面上的强度分布与各不同参数间的依赖关系.
ZHOUYi-min(周益民) +1 more
doaj +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2002 设ψ(n)是Dedekind函数.r为正整数,则有其中α是与r有关的常数,而E(x,r)是误差项.利用经典的复积分理论及解析的方法研究了E(x,r)的算术均值和积分均值,得到了一个较为精确的估计式.
SHIMei-hua(史美华)
doaj +1 more source
Assessing Closed Hydroponic Subsystems for Batavia Lettuce Growth Under Different Planting Densities
World Water Policy, Volume 11, Issue 2, Page 427-438, May 2025.ABSTRACT Hydroponic systems have the potential to be sustainable and alternative methods for food production that confer advantages of high production and better control of growth. However, only a few studies have focused on leafy vegetable growth in different subsystems and environmental variables.
Demet Çekin +6 more
wiley +1 more source
China's Eco‐Civilisation, Climate Leviathan, and Hobbesian Energy Transition
Antipode, Volume 57, Issue 3, Page 830-861, May 2025.Abstract Scholars have hitherto tended to theorise China's ecological civilisation project either as a form of environmental authoritarianism or as a vision of eco‐socialism. This paper contributes to the conversation by conducting a textual analysis of Chinese scholarly discussions on eco‐civilisation.
David Chen
wiley +1 more source
The Study on Value and Incentive Mechanism of Information Sharing in Closed-loop Supply Chain [PDF]
, 2017 环境恶化与资源枯竭问题已经引起社会广泛关注，循环经济受到各国的普遍重视。在此背景下，传统供应链逐渐向闭环供应链演变。闭环供应链具有复杂性、不确定性等特征，信息共享解决了上下游企业之间“信息孤岛”的问题，使得闭环供应链的协调性大大提高。为探究信息共享对闭环供应链中各个节点企业及整个系统的具体影响，部分学者对信息共享的价值进行了定量化建模研究，但是通常只研究了一种回收模式下信息共享的价值。本文将信息共享问题与回收模式决策问题相结合，研究了不同回收模式下信息共享的价值。 本文以需求预测信息共享价值为研究对象 ...
亓素娟
core