Results 11 to 20 of about 193,229 (203)
, 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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Study on Optimal Process and Antioxidant Activity of Polygonatum sibiricum Polysaccharides Extracted by Deep Eutectic Solvents(低共熔溶剂提取黄精多糖工艺优化及抗氧化活性研究) [PDF]
Shipin kexue jishu xuebao, 2020 In this study, Polygonatum sibiricum polysaccharides (PSPs) were extracted by deep eutectic solvents(DESs) with different ion combinations. The optimal effect of urea-choline chloride deep eutectic solvents was obtained.
WANG Tao(汪涛) +6 more
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He jishu在海洋条件下流动换热组件中工质受核动力装置升潜、摇摆或复杂运动引入的附加惯性力作用并可能产生附加流动，附加流动与工质自身的流动相叠加，从而形成复杂的流动形式，进而影响换热组件的流动换热特性。为了研究海洋条件对螺旋管换热组件的流动和传热的影响，通过搭建模拟海洋条件试验平台，研究了倾斜、摇摆、起伏等典型海洋条件对螺旋管换热组件流动和传热特性的影响。研究表明：摇摆条件下，回路自然循环流量及试验段压降均随着运动呈现正弦变化，波动幅度随着摇摆角增加和周期减小而增加。由于压力波传播的速度与流量响应速度不同 ...
姚 彦贵 +5 more
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植物油加工厂应急事故水池容积计算Volume calculation of emergency pool in vegetable oil processing plant
Zhongguo youzhi, 2022 应急事故水池是植物油加工项目风险防控体系的重要组成部分，依据《化工建设项目环境保护工程设计标准》(GB/T 50483—2019)提出了应急事故水池容积计算的技术要点和原则，并结合具体案例，对植物油加工厂应急事故水池的容积计算进行了系统研究。计算得到的应急事故水池容积既能满足建设规范要求，又能节约土地、节省建设投资，对植物油加工项目的设计、安全与风险评价等具有重要的指导意义。The emergency pool is an important part of the risk prevention ...
张金江， 王志丹， 王文昕， 林凤岩， 李健， 李鹏， 陈永军， 黄永娜 ZHANG Jinjiang, WANG Zhidan, WANG Wenxin, LIN Fengyan, LI Jian,LI Peng, CHEN Yongjun, HUANG Yongna
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Tackling saiga horn consumption in Singapore: From consumer insights to intervention co‐design
People and Nature, EarlyView.Abstract The illegal and unsustainable wildlife trade is a key driver of biodiversity loss, and reducing consumer demand is recognised as a critical step in addressing it. However, studies understanding the drivers of wildlife product consumption and identifying effective strategies to reduce it remain very limited.
Xiaotong Cai +5 more
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, 1988 本文对早期疲劳设计方法,包括无限寿命设计、安全寿命设计、破损-安全寿命设计、损伤容限设计作了简单的回顾,对可靠性设计新方法作了详尽描述,同时还对疲劳寿命估算中的名义应力法与局部应力应变法进行了比较 ...
曾春华
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Safety Science and Technology, EarlyView.By in situ reaction blending, DOPO‐HQ and THEIC were added to PLA with MDI to construct a phosphorus containing polyurethane network, which significantly improved the flame retardant and anti‐dripping properties of polylactic acid composites. ABSTRACT Polylactic acid (PLA) is highly flammable and prone to severe melt dripping during combustion, which ...
Chiyuan Chen +4 more
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Zhejiang Daxue xuebao. Lixue ban, 2009 随着经济技术开发区的演化和递进,开发区的发展进程进入了后开发区时代,其典型特征是大量城市综合要素和生产经济活动在区内并存聚集,开发区呈现综合功能和多元内容的新城发展趋势.本文以杭州市经济技术开发区为例,从模式优化的准则与理念、空间结构及形态发展模式优化的论证与定位、用地单元组织三方面诠释后开发区时代新城型开发区空间结构及形态发展模式优化.
GEDan-dong(葛丹东) +2 more
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Wildlife Letters, EarlyView.FoxWatch is a user‐friendly analytical workflow that converts camera‐trap detections into dependable estimates of fox abundance. The user‐friendly Shiny R app standardizes data preparation, employs Simultaneous‐Count Models modeling, and displays uncertainty in clear, comprehensible outputs. By connecting field monitoring with decision‐making, FoxWatch
Duminda S. B. Dissanayake +1 more
wiley +1 more source
A systematic review of avian influenza virus transmission models: Gaps and opportunities
Methods in Ecology and Evolution, EarlyView.Abstract Highly pathogenic avian influenza virus (HPAIV) increasingly threatens wild birds, poultry, non‐human mammals and humans, yet gaps and opportunities in avian influenza virus (AIV) transmission modelling have not been comprehensively synthesized.
Shenglai Yin +7 more
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