Results 81 to 90 of about 24,269 (138)

不依赖先验信息的多球谱仪中子能谱解谱方法研究

He jishu
在中子能谱的多球谱仪测量中，现有解谱方法依赖于先验信息进行求解，而在某些特殊应用场景中，如在反应堆屏蔽结构深穿透计算方法的验证中，需要测量值独立于理论先验，即解谱过程不依赖先验信息，从而实现对理论方法的验证。因此，本文结合Lanczos双对角化和Tikhonov正则化方法，建立了基于Krylov子空间方法的迭代正则化解谱方法，并应用于241Am-Be中子源能谱的测量实验。相较于应用广泛的GRAVEL算法和ML-EM算法，迭代正则化方法可有效避免“半收敛”，在实测值涨落较大的情况下实现较好的求解。
唐 松乾, 谭 怡, 杨 俊云, 刘 斌, 李 硕, 潘 良明   +5 more
doaj   +1 more source

Regulatory compliance and support for altered management of the exotic pet trade

Conservation Biology, Volume 40, Issue 4, August 2026.
Abstract Globally, the exotic pet trade has contributed to species invasion, disease, and animal welfare risks. Although scientists have advocated for increased trade regulation, the success of management and regulatory efforts depends on compliance by participants in the exotic pet trade. We used a regulatory compliance framework to investigate exotic
Elizabeth N. Pratt, Julie L. Lockwood, Elizabeth G. King, Elizabeth F. Pienaar   +3 more
wiley   +1 more source

Using customs data to understand overlooked trade in non‐CITES birds between Africa and Asia

Conservation Biology, Volume 40, Issue 4, August 2026.
Abstract The international trade in live birds poses risks to animals, people, and biodiversity. To effectively mitigate these risks, decision‐makers require information on the volume, dynamics, and direction of trade. Despite Africa once being the largest exporter of birds by region, very little data exist on recent trade in live birds not listed on ...
Alisa Davies, Astrid A. Andersson, Rowan O. Martin, Sam Inglis, Caroline Dingle   +4 more
wiley   +1 more source

Providing regular and frequent maps of losses and gains of farmland birds based on European monitoring data

Conservation Biology, Volume 40, Issue 4, August 2026.
Abstract Knowledge of species distributions is essential for informing policies on nature conservation and restoration. However, updating them on a regular basis and doing so in a harmonized manner at the international level is difficult. The European Bird Census Council integrated national monitoring data covering 5 years to update farmland bird ...
Sergi Herrando, Guillem Pocull, Sara Fraixedas, Anna Gamero, David Martí, Oriol Solà, Dani Villero, Verena Keller, Petr Voříšek, Alena Klvaňová, Gabriel Gargallo, Vitalie Ajder, Marc Anton, Ainars Aunins, Dawn Balmer, Mattia Brambilla, Tomasz Chodkiewicz, Przemysław Chylarecki, Cristi Domșa, Vlatka Dumbović Mazal, Virginia Escandell, Néstor Fernández, Ruud Foppen, Juan Gallego‐Zamorano, Carlos Godinho, Irene Guerrero, Christina Ieronymidou, Frédéric Jiguet, Aleksi Lehikoinen, Primož Kmecl, Peter Knaus, Lechosław Kuczyński, Åke Lindström, Qenan Maxhuni, Blas Molina, Jean‐Yves Paquet, Maria Luisa Paracchini, Danae Portolou, Draženko Z. Rajković, Dimitrije Radišić, Jiří Reif, Paul Shimmings, Henk Sierdsema, Jovica Sjeničić, Karel Šťastný, Bård G. Stokke, Nicolas Strebel, Zoltán D. Szabó, Tibor Szép, Norbert Teufelbauer, Nicolas Titeux, Sven Trautmann, Judit Veres‐Szászkac, Thomas Vikstrøm, Lluís Brotons   +54 more
wiley   +1 more source

Centering geospatial data uncertainty and the potential for injustice in pastoralist rangeland conservation prioritization

Conservation Biology, Volume 40, Issue 4, August 2026.
Abstract Procedural, distributional, recognitional, and epistemic justice aspects of conservation interventions are well documented in contexts where pastoralism is a key livelihood and way of life. Geospatial analyses and representations of wildlife conservation and restoration that are increasingly applied in pastoralist rangeland socioecological ...
Ryan R. Unks
wiley   +1 more source

Changes in the transformative potential of action proposals in Finnish Red Lists from 1986 to 2019

Conservation Biology, Volume 40, Issue 4, August 2026.
Abstract Red lists provide critical knowledge regarding biodiversity decline, especially in Finland, where broad assessments have been made regularly since the 1980s. They deliver information on the threat status of species and ecosystems, propose actions to guide conservation policy, and have the potential to spur transformative change.
Anni Arponen, Anna Salomaa, Henna Fabritius, Aino Juslén, Saija Kuusela   +4 more
wiley   +1 more source

关于不定方程x⁴-Dy²=1的一个注记

四川大学学报. 自然科学版, 1997
设整数Ｄ＞０且不是平方数，本文证明了不定方程ｘ４－Ｄｙ２＝１除开Ｄ＝１７８５，４·１７８５，１６·１７８５时，分别有二组正整数解（ｘ，ｙ）＝（１３，４），（２３９，１３５２）；（ｘ，ｙ）＝（１３，２），（２３９，６７６）；（ｘ，ｙ）＝（１３，１），（２３９，３３８）外，最多只有一组正整数解（ｘ１，ｙ１），且满足ｘ２１＝ｘ０或２ｘ２０－１，这里ｘ０＋ｙ０Ｄ是Ｐｅｌ方程ｘ２－Ｄｙ２ ...
孙琦, 袁平之
doaj  

How identity bias affects perceptions of conservation messages on social media

Conservation Biology, Volume 40, Issue 4, August 2026.
Abstract Public support is essential for conservation, as public opinion can influence decision‐making and policy. Therefore, understanding whether bias toward conservationists due to their identity (identity bias) affects their perceived credibility and support for their recommendations is important.
Lauren F. Rudd, Yolanda Mutinhima, Shorna Allred, Amy J. Dickman, Darragh Hare   +4 more
wiley   +1 more source

一个有理差分方程解的存在性和稳定性

四川大学学报. 自然科学版, 2012
作者考虑了一个分母含有二次项的有理差分方程.应用线性化方程理论,作者证明了解的存在性和稳定性,并在一定条件下,证明了该方程所有的正解都收敛到唯一的正平衡点.所得结果证明了Sedaghat提出的一个猜想是正确的.
蒋敏, 周俊
doaj  

Does public participation foster stakeholder support for policy proposals? Evidence from the European Union

Policy Studies Journal, Volume 54, Issue 3, August 2026.
Abstract We examine whether and how public participation in policymaking contributes towards fostering stakeholder support for policy proposals formulated in the bureaucratic arena. We explain how key markers of procedural fairness describing both the participation process and policymakers' presentations of it during the decision justification stage co‐
Adriana Bunea, Idunn Nørbech
wiley   +1 more source