Results 121 to 130 of about 78,527 (268)
The Economic History Review, EarlyView.Abstract Housework is central to feminist calls for recognition of women's work, economic histories explaining the sexual division of labour, and claims regarding the progressive role of scientific knowledge. Yet little is known about the time it actually took. We address this lacuna.
Sara Horrell, Jane Humphries
wiley +1 more source
Jingshui jishu【目的】工厂化循环水养殖系统(RAS)具有占地面积小、耗水量少、管理效率高、产品质量好等优点，是水产养殖的热点和主要发展方向。【方法】本文从水动力学的角度，对大口黑鲈商业化RAS的水头损失进行了计算和分析，并对系统进行了24 h水质跟踪监测，研究了水流状态对水处理系统的影响。【结果】养殖池24 h内氨氮和亚硝酸盐氮的质量浓度分别为1.14～3.56 mg/L和0.72～1.10 mg/L。氨氮浓度随饲料投喂而升高，经生物滤池硝化作用逐渐降低，亚硝酸盐氮浓度相对稳定 ...
JIE Liang, ZHANG Huiying, LI Hua
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Gender, Work &Organization, EarlyView.ABSTRACT The infrastructure of precarious work is racialized and gendered, affecting disenfranchised Black women who carry the burden of low paid caregiving within the healthcare system. In South Africa, Community Health Workers, predominantly Black women from marginalized communities, have been vital in providing primary healthcare services at home ...
Sivuyisiwe Wonci
wiley +1 more source
超高效液相色谱-串联质谱法快速测定水中19种全氟和多氟化合物
Jingshui jishu【目的】本文建立了一种超高效液相色谱-串联质谱法(UPLC-MS/MS),用于快速测定生活饮用水和水源水中19种全氟和多氟化合物(PFASs)。【方法】试验采用UPLC-MS/MS技术，对水样进行快速直接分析。前处理方法极为简单，仅采用0.22μm再生纤维针式过滤器过滤，省略了传统固相萃取的活化、上样、淋洗和洗脱等繁琐步骤，大幅节约了有机溶剂与样品处理时间。目标物经C 18 色谱柱分离后在电喷雾离子源(ESI)负离子模式下电离，采用多反应监测模式(MRM)进行定性和定量分析检测 ...
REN Yuanyuan +4 more
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Gender, Work &Organization, EarlyView.ABSTRACT Although there is extensive research on invisible work and its relation to labor market performance, understanding this phenomenon from the perspective of women in multiple hierarchical positions in the Middle East remains limited. This study integrates a situated intersectionality perspective with the literature on invisible work mechanisms ...
Maha Sabbah‐Karkabi, Amit Kaplan
wiley +1 more source
Jingshui jishu【目的】节假日期间大规模的人口流动会引起城市用水量的显著波动，而传统用水量预测模型无法准确捕捉这一趋势，导致预测精准度与可靠性不足，影响节假日期间制水计划的科学制定，制约供水系统的调度效率。本文致力于构建一种能够有效融合人口动态信息的节假日用水量预测方法，为城市智慧水务系统的发展及科学调度提供理论和技术支持。【方法】本文提出了一种基于Transformer架构的预测模型，采用多头注意力机制捕捉节假日期间用水模式的依赖关系，引入人口迁徙指数作为关键特征，以F市2024年劳动节 ...
LI Zhongmao
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Guide to on-site wastewater management for industrial and commercial establishments and other institutions: guide for hotel and restaurant owners and managers in Kurunegala, Sri Lanka [PDF]
Wastewater treatmentWater ...
Dissanayake, Priyanka, Tennakoon, M.
core
The Calumet Area Hazardous Substance Data Base : A User's Guide with Documentation [PDF]
, 1990 HWRIC Project 88/89-055NTIS PB90 ...
Colten, Craig E., Samsel, Ted B.
core
Do carbon prices affect stock prices?
Journal of Financial Research, EarlyView.Abstract We explore how carbon pricing affects corporate financial performance during Phase 3 of the European Union Emissions Trading Scheme (EU ETS). We find that the relationship between carbon prices and stock prices depends critically on the proportion of verified emissions covered by freely allocated ETS allowances: For firms with a greater ...
Patrick Bolton +2 more
wiley +1 more source
聚氨酯海绵悬浮过滤工艺对溢流污水处理协同调控的本征特性与运行参数
Jingshui jishu【目的】合流制溢流(CSO)是导致城市水体水质恶化的主要诱因之一。悬浮过滤工艺作为应对CSO的有效手段，其核心效能受滤料本征特性与工艺参数的协同调控机制尚未明晰。【方法】文章采用聚氨酯海绵滤料，考察了海绵的亲疏水性、密度、开孔比、几何尺寸以及滤速、填充高度和滤床清洗方式对过滤性能的影响，并评估了该系统在颗粒物浓度梯度进水下的处理表现。【结果】开孔比是影响过滤性能的关键，开孔比为50的海绵展现出最优综合性能，其对悬浮物(SS)平均去除率为62.2%,过滤2 h后水头损失为20 mm ...
Ye Chenyang, Wang Tao
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