Results 1 to 10 of about 1,316,736 (163)
, 2020 UUV(unmanned underwater vehicle,无人水下航行器)在海洋民用与军事领域具有广阔的应用前景。UUV耐压结构作为影响UUV负载能力及保障UUV航行任务安全高效执行的重要部件,其优化设计有重要意义。为了最大程度地实现减重目标,有效平衡耐压结构质量、结构强度和稳定性之间的矛盾,进而提升UUV综合性能,提出一种基于组合加权响应面法的多目标优化方法。通过试验设计得到初始采样点,利用有限元工具计算响应值并构建代理模型;然后,以折衷规划法对子目标进行归一化处理 ...
郑荣, 于延凯, 朱兴华, 高启升
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, 2012 基于遗传算法和单纯形法构造出了一种混合优化算法,对不同编码方式的算法进行了对比分析。发现混合算法的寻优能力明显优于遗传算法的寻优能力;实数编码的混合算法能够更好的保持种群多样性,在存在多个局部最优解的情况下,比二进制编码的混合算法的寻优能力强。利用构造的基于实数编码的混合算法,结合Hicks-Henne型函数参数化方法和Kriging代理模型,对高速列车的截面变化率进行了减小气动阻力的优化设计 ...
孙振旭 +4 more
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Comprehensive framework for assessing and optimizing existing research networks
Conservation Biology, EarlyView.Abstract Conservation, monitoring, and research networks, or collections of ecological research sites unified under a common mission of data collection or a research mission, are essential infrastructure for understanding large landscapes. However, most networks developed opportunistically over decades rather than through systematic design, creating ...
Alyson East +2 more
wiley +1 more source
Gongye shui chuli, 2003 提出了纯水制备反渗透膜系统优化设计的经典模型, 导出了相应的简化模型, 描述了用现行设计软件实现优化设计的具体计算过程, 明确了系统优化结构的两个判据。在此理论与方法指导下, 得出了对应低难溶盐给水条件的膜系统最优"六支段饱和结构", 并结合浓差极化指标严格界定了低难溶盐给水的各难溶盐临界饱和度, 从而为小型反渗透膜系统的设计提供了一套完整的优化理论、优化方法与优化结构。
靖大为, 徐腊梅, 王婷
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Using the capabilities approach to achieve people‐centered conservation
Conservation Biology, EarlyView.Abstract Top‐down interventions carried out by state and nonstate institutions to conserve biodiversity and improve the lives of forest‐proximate people (FPP) in the Global South tend to reflect economistic understandings of human well‐being. More progressive and people‐centered conservation projects are guided by normative visions of how the world ...
Arthur Rodrigues +4 more
wiley +1 more source
Optimizing biodiversity offsetting for habitat succession and colonization dynamics
Conservation Biology, EarlyView.Abstract Biodiversity offsetting aims to compensate for ecological losses from development through conservation and restoration. However, its long‐term outcomes under repeated impact–offset cycles remain uncertain. Using a conceptual forest succession model, we evaluated how offset outcomes are affected by interactions among compensation scale ...
Konstans Wells +4 more
wiley +1 more source
International Journal of Applied Linguistics, EarlyView.ABSTRACT Gamification has been increasingly implemented for language learning purposes across the globe. However, there remains unknown regarding how the change in gamification design might maximize students’ language learning outcomes and engagement.
Shen Qiao +2 more
wiley +1 more source
, 2012 针对CRH380A型高速列车头部外形的气动减阻问题, 设计了一种新型的基于自由曲面变形的局部型函数参数化方法, 提出了一套基于实数编码遗传算法的变光滑因子广义回归神经网络响应面模型(GA-GRNN)的气动外形优化方法. 优化结果表明: 局部型函数参数化方法操作简单、实现方便, 使用少量的设计参数可以控制较大变形区域, 且能保证变形的光顺性和不同变形区域间的光滑过渡; 使用同样的样本点进行训练, GA-GRNN 比GRNN的预测精度高, 更容易得到全局最优解; 优化后, CRH380A ...
杨国伟, 姚拴宝, 郭迪龙
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Accountability in Government Use of AI: Citizen Concerns and Preferences
Public Administration, EarlyView.ABSTRACT Government adoption of AI opens the “pandora's box” of accountability, a core aspect of public value. Despite the centrality of governmental AI accountability, citizens' concerns and preferences in holding governments accountable for AI usage remain poorly understood.
Naikang Feng, Yanto Chandra
wiley +1 more source
Jixie chuandong, 1998 齿轮减速器的优化设计提高了设计的质量。但由于客观条件的千差万别，常常需要对不同设计要求的减速器进行优化设计。显然这是十分繁杂的工作。为了既能最大限度地满足不同设计要求的实际需要，又能简化其优化设计，本文以单级圆柱齿轮减速器为例进行优化设计，然后根据量纲理论，求出相似准则；通过简单的运算，将其优化设计参数转换为不同设计要求的其它齿轮减速器的优化设计中去。
韩复杰
doaj