Results 71 to 80 of about 7,628 (255)
Oikos, EarlyView.Understanding the scales and mechanisms by which species composition interacts with ecosystem functions is critical for forecasting the effects of environmental perturbations on ecosystem services. However, the linkages between what regulates the ecosystem functions of dispersal‐capable networks of communities (metacommunities) and what regulates a ...
Thomas P. Shannon, Evelyn E. Gaiser
wiley +1 more source
Jingshui jishu【目的】城镇供水管道是城市生命线工程的重要组成部分，一旦发生故障，不仅会威胁用户用水安全，还可能导致大规模水资源浪费和重大经济损失。应用科学可靠的风险评估方法对供水管道进行全面的安全风险评估变得愈发关键，是保障供水系统安全运行的重要手段。【方法】基于供水管道运行特征和风险管理理论，建立包含结构属性、运行状态、外部环境和服役属性多维度指标的风险评估体系，并采用结构熵权法确定各指标权重。运用模糊逼近理想解排序(TOPSIS)算法对风险指标数据进行归一化处理与动态排序 ...
Xu Shengxin +5 more
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The Hidden Costs of Coffee Production in the Eastern African Value Chains
Sustainable Development, EarlyView.ABSTRACT There is increasing recognition that significant hidden costs associated with agrifood systems are not reflected in market prices. Coffee is among the three most traded agricultural commodities in the world and supports the livelihoods of more than 30 million smallholder households.
Annet Adong +3 more
wiley +1 more source
An in-depth report on the development, advancement, and implementation of pneumatic waste collection systems and a proposed program for the practical evaluation of such a system in terms of waste disposal parameters, engineering design, and economic costs [PDF]
, 2004 CIVINS (Civilian Institutions) Thesis documentAt the turn of the nineteenth century the collection and removal of most urban household waste materials was accomplished via local refuse disposal wagons.
Jackson, Stephen B.
core +1 more source
Jingshui jishu【目的】为支撑智慧水务发展，满足水厂精细化调度需求，提升供水效率与资源利用率，需构建时供水量预测模型以优化生产调度。【方法】以华东地区A水厂为研究对象，本文综合时间特征、气象条件、设备检修工况及水力参数构建含58个初始特征的数据集，采用递归特征消除(RFE)算法筛选出16个关键特征，同时引入贝叶斯优化(BO)对极端梯度提升树(XGBoost)模型的超参数进行寻优，建立时供水量预测模型。【结果】BO后模型平均绝对百分比误差(MAPE)为4.58%,平均绝对误差(MAE)为676.02
Yang Yuling +5 more
doaj +1 more source
Sustainable Development, EarlyView.ABSTRACT The dynamic nature of small islands being geographically isolated and their perceived connectedness with global networks complicates research attempts to draw general conclusions on whether insularity leads to marginalization or strengthens their resilience for sustainable development.
Toheeb Lekan Jolaosho +2 more
wiley +1 more source
Jingshui jishu【目的】针对人工调控主导的水库型水源地水位变化规律复杂、传统预测方法精度不足的难题，本文旨在构建并验证一种物理信息融合的多模块机器学习耦合预测框架，以实现对此类水库水位的合理且兼具高时效性的预测，为水库的精细化调度提供决策支持。【方法】本文将该预测框架应用于JZ水库，对水库内运行机理不同的调控单元进行定制化建模：(1)对引水闸门流量预测采用双层级联模式，基于先知模型(Prophet)的闸门开度时序预测与基于极端梯度提升(XGBoost)的流量系数(C d )动态估计 ...
Zhang Wu
doaj +1 more source
The Circular Economy in European Union Supply Chains: A Literature Review
Sustainable Development, EarlyView.ABSTRACT This research aims to analyze the implementation of the circular economy (CE) in European Union (EU) supply chains (SC), highlighting its potential to transform production systems and maximize resource efficiency while minimizing waste. Our study identifies the major trends and advancements in this field, focusing on the barriers that prevent ...
Luis Oswaldo Rodríguez‐Mañay +2 more
wiley +1 more source
Jingshui jishu【目的】本文研究聚苯乙烯纳米塑料(PS-NPs)对铜绿微囊藻(Microcystis aeruginosa)生长的影响，认识PS-NPs对铜绿微囊藻的胁迫和毒理作用，以及为淡水生态系统保护和修复提供理论依据。【方法】本文选择含不同浓度PS-NPs的培养基开展了铜绿微囊藻的培养试验，分析PS-NPs对铜绿微囊藻的生长、光合特性、抗氧化系统和细胞表面形态的影响。【结果】在PS-NPs对铜绿微囊藻的15 d暴露试验中发现，藻的生长速率、光合作用效率以及氧化损伤作用强度与PS ...
WANG Xiaoxiong, YANG Nan, GAO Jingsi
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Developing and Testing a Citywide Inclusive Sanitation Financial Tool
Sustainable Development, EarlyView.ABSTRACT Citywide Inclusive Sanitation (CWIS) represents a paradigm shift in the provision of safely managed sanitation services with a framework of three outcomes—equity, safety and sustainability. There are several sanitation financial tools, but none of these fully address all CWIS outcomes. Citywide Inclusive Sanitation Financial Tool (CWIS‐FiT) is
Camila Silva Franco +6 more
wiley +1 more source