Results 111 to 120 of about 28,261 (190)
, 2019 [目的/意义]作者主题模型作为近年来计算机领域关注度较高的新型概率模型，在文本挖掘与自然语言处理等方向已有广泛应用。分析国内外作者主题模型及其改进的思路与应用，更好地把握其研究现状，以期为计算机、图书情报等相关领域科研人员提供参考。[方法/过程]本文选取Web of Science核心数据库、DBLP及中国知网（CNKI）数据库作为文献来源，通过制定检索规则、去重及人工判读等操作提炼出关于作者主题模型及其改进方法的文献集，从模型应用过程的视角，结合文献分析法对现有研究进行总结归纳。[结果/结论 ...
刘小平, 徐涵
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Detecting mass mortality events in wildlife populations
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract Reports in the literature of mass mortality events (MMEs) involving diverse animal taxa are increasing. Yet, many likely go unobserved due to imperfect detection and infrequent sampling. MMEs involving small, cryptic species, for instance, can be difficult to detect even during the event, and degradation and scavenging of carcasses can make ...
Jesse L. Brunner, Justin M. Calabrese
wiley +1 more source
Guangtongxin yanjiu, 2006 构造了一种用于二维同步光码分多址（OCDMA）系统的修正素数跳频码（MPC/PC）,分析了码字的自相关和互相关性能,研究了二维同步OCDMA系统的误码率和吞吐量性能。结果表明,与一维同步OCDMA系统相比,二维同步OCDMA系统的可接入用户数大大增加,误码率大大降低,吞吐量明显提高。
吉建华 +4 more
doaj
Comparasion study on the effects of mangrove wetland sediments on the sequestration of typical sulfonamides from the estuarine water [PDF]
, 2015 作为陆地污染物进入海洋的屏障，红树林已然成为众多典型污染物汇聚的场所之一。近年来，海产养殖业的大肆兴起更是加重了抗生素在红树林区的直接污染。锁定态是控制土壤抗生素归宿的主要因素，具有环境存在时间长，危害大等特点，可通过再释放重回到环境中，对环境造成长期危害。对典型磺胺类在红树林群落沉积物中锁定能力的研究对于探索抗生素在红树林区的环境行为和红树林湿地抗生素污染控制及修复功能评估具有现实意义。本文选取了12种水产、禽畜及人用较为频繁的典型磺胺类药物，分别为磺胺甲噻二唑(sulfamethizole,SMT)、
张宇
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Mitigating light pollution impacts on arthropods based on light‐emitting diode properties
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract Light pollution from artificial light at night (ALAN) is a significant environmental problem with far‐reaching consequences for ecological systems. Recent innovations in light‐emitting diode (LED) technology may offer sustainable outdoor lighting solutions, but scientific evidence is lacking. We investigated the effects of various LED lighting
Nicola van Koppenhagen +3 more
wiley +1 more source
Gaoya dianqi, 2017 日盲紫外成像是一种可视化的高压设备放电检测新方法,为能量化分析放电,利用OpenCV的图形处理功能,对紫外图像进行数字图像处理并提取了放电区域相关参数。介绍了数字图像处理的相应算法原理和OpenCV中相关函数的使用方法;利用OpenCV对紫外检测放电图像进行了图像灰度化、二值化、图像除噪及轮廓提取,实现了对放电光斑面积、周长等参数的提取。最后利用对比试验方法,通过紫外成像光斑面积和放电量之间的正相关关系,验证了基于OpenCV紫外检测方法的合理性;同时,研究结果表明 ...
李炼炼 +5 more
doaj
Extent of threats to marine fish from the online aquarium trade in the United States
Conservation Biology, Volume 40, Issue 1, February 2026.The global marine aquarium hobby is a multibillion‐dollar industry, largely driven by demand from the United States. Much of this trade occurs online. We web scraped 4 major US‐based e‐commerce platforms selling marine aquarium fish to determine the retail price and source (wild capture, aquaculture, or both) of 13 families of ray‐finned marine fish ...
Bing Lin +6 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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SWEET1‐mediated glucose transport is crucial for energy availability in Arabidopsis
New Phytologist, Volume 249, Issue 4, Page 1816-1830, February 2026.Summary The stress‐responsive hormone abscisic acid (ABA) is known for its inhibitory effects on various physiological processes, including seed germination, often resulting in energy deprivation. Interestingly, ABA‐induced germination inhibition can be alleviated by exogenous glucose (Glc), mimicking a functional interplay between ABA and sugar ...
Xueyi Xue +3 more
wiley +1 more source
A Study of Relational Benefits in Restaurant Consumers based on Social Exchange Theory [PDF]
, 2015 旅游观光业是以人为本的第三产业，通过人际接触与服务的方式进行交流，进而达成消费者与提供服务的经营者双方都获得彼此所需。由于科技的发展与进步，智能科技与互联网的普及，旅游观光业大量使用先进科学技术替代过往，提供了新的服务方式。有助于快速服务与降低人员成本，但同时失去过往人际交际才能培养出的浓厚感情与忠诚度等其他利益。面对这问题状况，科技服务的提供在旅游观光业到底是利大于弊，亦或是弊大于利，是个令人值得探讨的状况。 其中，服务接触的概念是指提供服务的店家通过媒介将服务传递给消费者的方式 ...
趙家偉
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