Results 101 to 110 of about 1,210,655 (177)
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 +5 more
doaj +1 more source
Assessing and strengthening community‐based coastal governance
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Community‐based coastal governance is essential for biodiversity conservation and sustainable livelihoods, yet many communities continue to face significant challenges in establishing and sustaining effective governance systems. We sought to improve understanding of the current status of community‐based coastal governance across five countries
Mark Andrachuk +21 more
wiley +1 more source
Power Leveraging: The Everyday Expansion of the Grassroots State in Urban China
Law &Policy, Volume 48, Issue 4, October 2026.ABSTRACT China has witnessed a notable expansion of state power during and after the pandemic, particularly at the grassroots level. How has this occurred? The Shequ, a grassroots state agent, has played a central role, taking on extensive administrative responsibilities aimed at enhancing social management, often at the expense of rule‐of‐law ...
Aokai Yang
wiley +1 more source
, 2013 化石燃料的燃烧在人们的日常生活中起着非常重要的作用。在燃烧过程中，燃料的裂解过程总是伴随着氧化过程同时发生。全面深入的了解化石燃料的高温裂解过程对于加深对燃烧现象的理解，提高燃烧器燃烧效率和降低污染等方面起了非常关键的作用。化石燃料包括多种类型的碳氢化合物，直链烷烃是重要的一种。本文选取正庚烷为研究对象，使用包括量子化学计算、过渡态理论和基于反应性力场的分子动力学模拟方法，深入细致的研究了正庚烷的高温裂解过程。 直连烷烃和烷烃自由基的裂解速率常数是燃烧动力学模拟中非常重要的参数 ...
丁俊霞
core
Predictive evolutionary genomics: principles, validation, and practice
New Phytologist, Volume 252, Issue 1, Page 36-48, October 2026.Summary Climate change and habitat loss are driving rapid evolutionary responses in populations world‐wide, which creates an urgent need for evolutionary forecasting in conservation and agriculture. Such forecasting can be categorized into three time scales: trait‐based models that use multivariate quantitative genetic equations to project correlated ...
Daniel Ortiz‐Barrientos +5 more
wiley +1 more source
Green Hydrogen in Brazilian Media: Dominant Narratives and Missing Dimensions of the Energy Trilemma
Politics &Policy, Volume 54, Issue 5, October 2026.ABSTRACT Media discourses help shape the visibility and legitimacy of energy transition pathways in the public sphere. This study examines how Brazilian mainstream newspapers framed green hydrogen and assesses the alignment of these narratives with the energy trilemma: energy security, environmental sustainability, and social accessibility. We analyzed
Flávia Mendes de Almeida Collaço +3 more
wiley +1 more source
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
弱散逸項と外力項付き修正KdV方程式に対するエネルギー空間より広い空間におけるグローバル・アトラクター
, 2018 京都大学0048新制・課程博士博士(理学)甲第21412号理博第4432号京都大学大学院理学研究科数学・数理解析専攻(主査)教授 堤 誉志雄, 教授 泉 正己, 教授 上 正明学位規則第4条第1項該当Doctor of ScienceKyoto ...
Prashant
core +1 more source
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
, 1983 1.基本方程及其数值求解由于讨论的是轴对称问题,因此取柱坐标系中的θ坐标为任意曲线坐标系(q~1,q~2,q~3)中的q~2坐标,在轴纵剖面Z—R平面上取任意非正交曲线坐标q~3和q~1 ...
任孝安
core +1 more source