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几何形状对气垫升力的影响研究

哈尔滨工程大学学报（英文版） 2024年第1期23卷 74-84页

作者： Hamed Petoft Vahid Fakhari Abbas Rahi Faculty of Mechanical and Energy Engineering Shahid Beheshti UniversityTehran ***Iran

One of the crucial and challenging issues for researchers is presenting an appropriate approach to evaluate the aerodynamic characteristics of air cushion vehicles(ACVs)in terms of system design parameters.One of these issues includes introducing a suitable approach to analyze the effect of geometric shapes on the aerodynamic characteristics of ACVs.The main novelty of this paper lies in presenting an innovative method to study the geometric shape effect on air cushion lift force,which has not been investigated thus far.Moreover,this paper introduces a new approximate mathematical formula for calculating the air cushion lift force in terms of parameters,including the air gap,lateral gaps,air inlet velocity,and scaling factor for the first time.Thus,we calculate the aerodynamic lift force applied to nine different shapes of the air cushions used in the ACVs in the present paper through the ANSYS Fluent software.The geometrical shapes studied in this paper are rectangular,square,equilateral triangle,circular,elliptic shapes,and four other combined shapes,including circle-rectangle,circle-square,hexagonal,and fillet square.Results showed that the cushion with a circular pattern produces the highest lift force among other geometric shapes with the same conditions.The increase in the cushion lift force can be attributed to the fillet with a square shape and its increasing radius compared with the square shape.

关键词： Lift force Air cushion vehicle Geometric shape Simulation gap Inlet velocity Scaling factor

Closing the gap: Boosting Women’s Representation in Cybersecurity Leadership

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Journal of Information Security 2024年第1期15卷 15-23页

作者： Yasser Asiry The College of BILT Marymount University Arlington USA

The research consistently highlights the gender disparity in cybersecurity leadership roles, necessitating targeted interventions. Biased recruitment practices, limited STEM education opportunities for girls, and workplace culture contribute to this gap. Proposed solutions include addressing biased recruitment through gender-neutral language and blind processes, promoting STEM education for girls to increase qualified female candidates, and fostering inclusive workplace cultures with mentorship and sponsorship programs. Gender parity is crucial for the industry’s success, as embracing diversity enables the cybersecurity sector to leverage various perspectives, drive innovation, and effectively combat cyber threats. Achieving this balance is not just about fairness but also a strategic imperative. By embracing concerted efforts towards gender parity, we can create a more resilient and impactful cybersecurity landscape, benefiting industry and society.

关键词： Cybersecurity Workforce Leadership Gender gap Women Representation

国内外良好农业发展现状及我国gap前景展望

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河北农业科学 2023年第1期27卷 1-7,24页

作者：郭云霞曹志艳郝庆红苑士涛朱自平董金皋河北农业大学生命科学学院河北保定071001 河北农业大学植物保护学院河北保定071001 廊坊市农林科学院河北廊坊065000

gap作为国际公认的农产品认证标准,能够保证农产品质量安全并促进农业可持续发展。我国农业进入高质量发展时期,建立统一规范的农产品质量安全标准体系,使我国农业发展逐步实现“生态化”“自然化”“再生化”“现代化”“品牌化”。综... 详细信息

gap作为国际公认的农产品认证标准,能够保证农产品质量安全并促进农业可持续发展。我国农业进入高质量发展时期,建立统一规范的农产品质量安全标准体系,使我国农业发展逐步实现“生态化”“自然化”“再生化”“现代化”“品牌化”。综述了gap的发展背景、历程、各国发展现状;分析了我国良好农业规范认证发展现状以及存在的主要问题;提出“以基地建设为基础,树立地方品牌”“以标准建设为前提,完善过程管理”“以积极宣传为保障,提高消费水平”“以科技创新为引领,增强支撑能力”的对策建议。

关键词： gap 农产品质量发展建议

自适应注意力LSTM-ResNet下的滚动轴承故障诊断

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制造技术与机床 2024年第6期 74-81页

作者：姜健魏小源绵阳职业技术学院四川绵阳621000 兰州理工大学电气工程与信息工程学院甘肃兰州730050 甘肃省工业过程先进控制重点实验室甘肃兰州730050

滚动轴承信号具有复杂性和非线性的特点,对特征提取和故障分类带来挑战。为解决上述问题,文章提出一种自适应注意力LSTM-Resnet(long short-term memory residual network)下的滚动轴承故障诊断方法。首先设计双向LSTM组特征提取模型,... 详细信息

滚动轴承信号具有复杂性和非线性的特点,对特征提取和故障分类带来挑战。为解决上述问题,文章提出一种自适应注意力LSTM-Resnet(long short-term memory residual network)下的滚动轴承故障诊断方法。首先设计双向LSTM组特征提取模型,获取复杂运行条件下的滚动轴承特征;然后,提出自适应注意力LSTM-ResNet完成特征学习,并自适应调整模型中关键特征的权重;最后,采用全局平均池化(global average pooling,gap)方法结合Softmax模型缓解模型过拟合并完成故障分类。在数据集中完成滚动轴承故障分类,实验结果表明:文章方法的滚动轴承故障诊断准确率相对于SVD-ResNet方法和宽卷积模型更高,并且能在标记样本数量较少和噪声环境下均达到较高的检测准确率,具有更高的准确性和更强的鲁棒性。

关键词：机械设备故障诊断 LSTM 权重 Softmax gap