Results 51 to 60 of about 55,024 (177)
Analysis on Market-Based Inflation Expectation in China [PDF]
, 2016 近年来中国利率曲线有扁平化的趋势，与此同时中国处于低通货膨胀时代，此时研究国债收益率中实际利率和通胀预期所占的比重有助于我们分析经济主体对未来市场的预期以及未来经济可能出现的风险。对通货膨胀预期影响因素的进一步分析有利于我们根据当前的经济形势给出有效的政策建议。本文的首要任务是从市场中提取出通货膨胀预期的信息。一般来说获取通胀预期的方法有：基于对城镇居民问卷调查的抽样调查统计法，基于名义收益率利差的金融市场预测法，以及基于计量模型的建模预测法 ...
杜纬辰
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Evaluating the empirical basis for threat attribution in the IUCN Red List
Conservation Biology, EarlyView.Abstract Understanding the impacts of different threats on species is key to successful conservation interventions and policies. The International Union for Conservation of Nature (IUCN) assesses threats to species, and the organization's Red List of Threatened Species is a key conservation tool.
Ena Humphries +5 more
wiley +1 more source
The Return Predictability for the Chinese Stock Market Based on Predictive Regression [PDF]
, 2016 中国的股票市场发展到现在，不论在总市值还是在参与人数上都达到了相当大的规模。股票市场收益率作为投资者最为关心的话题，其预测研究不仅具有理论意义，同时具有非常深刻的现实意义。理论上，股市收益率的预测与市场有效性及资本资产定价等理论相联系。现实中，股市收益率的预测可用于测度资金成本以及用于指导投资组合决策。因此，股市收益率的预测研究是一个很有意义的主题。 本文基于2000年1月4日至2014年12月31日的日交易数据，利用预测性回归模型对中国股市收益率进行了预测研究。从两个层面选取经济变量以及构造技术指标 ...
陈蔚薇
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Conservation Biology, EarlyView.Abstract The design of experiments to investigate the combined effects of multiple stressors requires exposing target organisms to multiple combinations of stressor doses. Concurrent manipulation of stressors is often infeasible with wildlife, but long‐lasting health effects allow individual health to be used as an integrator of prior stressor exposure.
Enrico Pirotta +24 more
wiley +1 more source
Research on Energy Efficiency Optimization Algorithm for Copper Flash Smelting Process Based on Data-driven [PDF]
, 2016 铜闪速熔炼工序具有多变量、非线性、大时滞、强耦合、生产波动大的特点，传统的基于机理模型的优化控制系统很难适应多变的运行条件，预测结果偏差较大，影响最终的控制效果。随着计算机技术的发展，复杂工业过程中积累了大量生产数据，为我们从人工智能的角度进行建模与优化控制提供了数据基础。 本论文以某大型闪速炼铜企业的闪速熔炼生产过程为研究对象。为了实现铜闪速熔炼工序中的节能减耗，本文提出了一种满足三大工艺指标（冰铜品位，冰铜温度，渣中铁硅比）约束的能效优化模型：首先 ...
董云成
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Conservation Biology, EarlyView.Abstract Achieving global conservation policy goals requires the ability to set and measure progress toward science‐based targets for biodiversity. The species threat abatement and restoration (STAR) metric was developed to enable actors to set science‐based targets for species.
Louise Mair +17 more
wiley +1 more source
Assessment and Prediction of the Impact of Trade Liberalization on China's Carbon Emissions: Empirical Studies Based on GTAP Database [PDF]
, 2016 当今世界处于两个全球性进程，即经济全球化和气候变化的“双重暴露（doubleexposure）”之下。贸易自由化已经成为经济全球化的重要内容及目标，同时城市工业化进程的加快以及发展中国家经济的快速发展，导致大气中温室气体浓度增加并带来极端天气，这使得全球气候变化成为国际社会面临的重要挑战。作为全球化的两个进程，贸易自由化和气候变化之间相互联系、相互作用。一方面，已有研究表明，贸易自由化政策将通过影响经济系统的经济规模、经济结构、生产技术，进而影响生产过程中的能源消耗、能源结构、能源利用效率等 ...
余丽丽
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Previous research has established the relationships between motivation, anxiety, teachers’ support, and self‐regulated learning (SRL) in English‐as‐a‐foreign‐language (EFL) learning. Most of the studies, however, have taken a variable‐centered approach in addressing the variable correlations, while learners’ characteristics and variable links ...
Yuhong Jiao, Barry Bai, Jing Li
wiley +1 more source
Gaoya dianqi, 2018 文中提出了一种基于改进支持向量机的变压器实时热点温度预测方法。该方法以变压器负载电流、环境温度和顶层油温为特征值,将变压器热点温度预警与预测相结合,目的在于实现基于近期历史运行数据的变压器实时热点温度预测。文中研究分析了基于改进网格搜索、遗传算法及粒子群算法的支持向量机在变压器短期热点温度预测中的应用效果,结果表明,3种改进方法均可有效提升预测精度,但基于改进网格搜索算法的支持向量机预测效率最高。最后,以某35 k V油浸式变压器实时热点温度数据为样本集,文中所述方法可有效实现变压器短期热点温度预警预测,
廖才波 +5 more
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT Self‐regulated learning (SRL) as a key predictor of language learning has been widely studied, but few studies have examined it from a cross‐linguistic perspective. The present study investigated whether first language (L1) SRL strategy use transfers to second language (L2) SRL strategy use and the conditions under which this transfer occurs ...
Barry Bai, Xuan Zang, Gurpinder Lailli
wiley +1 more source