Results 71 to 80 of about 2,180 (133)
Research Progress of Non-destructive Testing Technology in Beef Quality [PDF]
Beef is rich in nutrients and is one of the favored meats among consumers. Market price, consumer willingness to buy and satisfaction are affected by the quality of beef, so it is important to test the quality of beef.
Hao LIU +8 more
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Design and validation of a micro turbine engine speed control system [PDF]
The control system of a micro turbine engine plays a crucial role during engine operation. Starting from the overall architecture, the control structure of the speed control system for a specific micro turbine engine is designed.
XU Jinfa, YUAN Xingyu
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Shiyou jixie, 2014 针对原油管式加热炉对流室炉管的腐蚀程度难以检测和评估的问题，采用声发射方法测试对流室炉管。应用灰色关联分析(GRA)原理，确定了能够有效反映炉管腐蚀状态的声发射表征因素，应用极限向量机(ELM)网络，建立基于声发射因素的对流室炉管腐蚀状态智能评价模型，并以1台正在大修的原油管式加热炉的对流室炉管为研究对象，进行腐蚀状态检测评估，评估结果表明该方法能够有效地对对流室炉管的腐蚀程度进行智能评价。
裴峻峰 +5 more
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Gaoya dianqi在电气化铁路的弓网系统滑动电接触中，受压力载荷影响的载流效率、载流相对稳定系数、磨损率、接触电阻是反映弓网摩擦和受流效果的重要参数。利用实验数据，通过蛇算法优化极限学习机得到四个参数的预测模型，以此为基础建立最优压力载荷目标函数；针对压力载荷寻优问题提出一种参考点生成方式对非支配排序遗传算法—Ⅲ进行改进，并对压力载荷进行寻优得到均匀广泛的pareto前沿解集；采用CRITIC法计算pareto前沿解集的客观权重，考虑机车运行速度的影响引入自适应因子，得到自适应权重 ...
陈忠华 +4 more
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Egg appearance quality detection based on CNN-SVM model [PDF]
ObjectiveIn order to improve the accuracy of egg appearance quality detection, an egg appearance quality detection model based on CNN-SVM model was established.MethodsCombined with the adaptive feature extraction capability of CNN and the super ...
LI Wanning, QI Ge, ZHAO Feng
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Gaoya dianqi灭弧室作为真空断路器的核心，其电场分布与内部结构设计紧密相关。文中首先研究均压屏蔽罩、悬浮屏蔽罩结构、屏蔽罩与触头的间距以及触头形状变化对灭弧室电场分布的影响，发现场强在悬浮屏蔽罩端部、触头端部及悬浮屏蔽罩与触头之间的区域出现集中现象。为进一步改善灭弧室电场分布情况，文中提出了一种基于极限学习机（ELM）与灰狼算法（MOGWO）相结合的方法对灭弧室重要结构参数进行优化设计，建立了以悬浮屏蔽罩的斜坡上方长度L1、端部卷边半径R、卷边角度θ、屏蔽罩与触头表面距离L2和触头端部曲率半径r为输入，电场强度最大值、
丁璨 +4 more
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Study of different classification models based-on microarray [PDF]
, 2013 基因芯片技术的发展为生物信息学带来了机遇,使在基因表达水平上进行癌症诊断成为可能。但基因芯片数据高维小样本的特征也使传统机器学习方法面临挑战。本文利用真实的基因表达数据,测试了目前主要的分类方法和降维方法在癌症诊断方面的效果,通过实验对比发现:基于线性核函数的支持向量机可以有效地分类肿瘤与非肿瘤的基因表达,从而为癌症诊断提供借鉴。The development of microarray technology will bring opportunities to bioinformatics and ...
孙远帅, 江弋, 玄萍, 陈垚
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Privacy-preserving indoor localization scheme based on Wi-Fi fingerprint with outsourced computing [PDF]
To solve the privacy-preserving problem of both the user and the server in indoor positioning, outsourcing part of the calculation to cloud server in the process of using Paillier encryption was considered.The scheme not only protected the privacy of the
Jin CAO +4 more
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Application of Energy Dispersive X-ray Fluorescence Spectroscopy in Analysis of Heavy Metals in Soil: A Review [PDF]
With the process of urbanization and industrialization, heavy metals enter the ecological environment through various pathways and accumulate in large quantities in the soil, causing potential risks to soil environmental health. In recent years, with the
Aosong JIANG, Longhua WU, Zhu LI
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基于多级特征提取和IHHO-KELM的变压器油中溶解气体体积分数预测
Gaoya dianqi油中溶解气体分析是变压器早期故障诊断的主要方法，准确预测未来特征气体体积分数有助于提前获取变压器的运行状态。为此提出了一种基于多级特征提取和IHHO-KELM的变压器油中溶解气体体积分数预测方法。首先，通过自适应白噪声完全集合经验模态分解将气体体积分数序列分解为多个子序列，利用奇异谱分析对子序列做进一步降噪处理，降低其非平稳性；其次，建立核极限学习机预测模型分别对各子序列进行预测，再将各子序列的预测结果叠加得到油中溶解气体体积分数的最终预测结果，并通过改进哈里斯鹰算法优化其超参数；最后，通过算例验证表明，
傅雨晨 +5 more
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