摘要：工业互联网平台被公认为智能制造的必要推动者,使物理制造资源得以虚拟化,并允许资源以服务的形式进行协作。作为平台的核心功能,制造服务协作优化致力于为制造任务提供高质量的服务协作解决方案。这种优化与任务的功能和数量要求密不可分,在编排服务时必须满足这些要求。然而,现有的制造服务协作优化方法主要关注服务之间针对功能需求的横向协作,很少考虑纵向协作来覆盖所需的数量。为了解决这一差距,本文提出了一种结合功能和数量协作的二维服务协作方法。首先,提出了一种描述服务的多粒度制造服务建模方法。在此基础上,建立了二维制造服务协同优化模型。在垂直维度上,多个功能等效的服务组成一个服务集群来完成一个子任务;在水平维度上,互补服务集群协作完成整个任务。服务的选择和所选服务的金额分配是模型中的关键问题。为了解决这个问题,设计了一种具有多个局部搜索算子的多目标模因算法。将该算法嵌入竞争机制来动态调整本地搜索算子的选择概率。实验结果表明,与常用算法相比,该算法在收敛性、解质量和综合度量方面具有优势。

摘要：开发了数学模型来预测原位反应生成的Al/TiB2金属基复合材料的最大拉伸强度和硬度。考察的工艺参数包括反应温度、反应时间和TiB2添加量。采用响应面方法,基于3因素5水平的中心复合旋转来设计原位反应实验方案。对所得模型采用ANOVA方法进行了验证。表明所得的模型对制备的材料力学性能的预测可信度在95%以上。

摘要：2024铝合金是一种重要的工程材料,被大量应用于航空工业。但是在含氯介质中,2024铝合金易于腐蚀。本研究对5 mm厚AA2024铝合金轧板进行摩擦搅拌焊接。通过Na Cl溶液盐雾腐蚀试验对试样在不同p H值、氯离子浓度和喷雾时间条件下的腐蚀性能进行评价。建立一个经验关系式对摩擦搅拌焊AA2024铝合金的腐蚀速率进行预测。采用含有3因素5水平的中心复合旋转设计以减少实验次数。采用响应曲面法研究实验参数间的关联关系。在中性p H条件下,腐蚀速率降低;而在碱性和酸性条件下,腐蚀速率增加。随着喷雾时间的增加,腐蚀速率降低,但腐蚀趋于均匀,而随着氯离子浓度的增加,腐蚀速率增加。

摘要：由于在高效率和精确性之间的好平衡，元模型基于优化算法是一个重要全球优化范畴并且广泛地被使用了。更好解决高度非线性并且集中的工程优化问题，一个提高的混血儿和适应元模型基于的计算全球优化(电子火腿) 首先在这个工作被建议。重要区域更改方法(IRU ) 和不同采样尺寸策略在优化方法被建议提高表演。由使用自动、可伸缩的策略，重要区域将根据搜索结果适应地被更新改进产生精确和集中率。不平的采样策略和集中的采样策略在优化的不同阶段被使用高效地改进搜索并且避免过早地在一个小设计空格聚在一起的结果。新优化算法的有效性被与不同变量凳子标记优化问题作比较到六个优化方法验证。电子火腿优化方法然后被使用优化实际否定泊松比率(NPR ) 的设计参数在这个工作的碰撞盒子。结果显示建议电子火腿在优化计算有高精确性和效率集中的问题和罐头广泛地在设计工业被使用。

摘要：Parametric modeling of the impeller which drove a small wind device was built by knowledge fusion ***2410 airfoil blade was created by KF *** technology of UG/KF secondary development for the automatic modeling of wind turbine blade,the program can read in the airfoil data files automatically and the impeller model entity can be generated *** order to modify the model,the aerodynamic characteristics of the impeller were analyzed for getting aerodynamic parameters by *** maximum force torch and best parameters of impeller were calculated.A physical prototype impeller was manufactured and the correctness of the design was verified,and the error of force torch between simulation and experimental results is about 10%.Parameterization design of the impeller model greatly improves the efficiency of modeling and flexibility of the CAD system.

摘要：Extensive numerical investigations of the performance and flow structure in an unshrouded tandem-bladed centrifugal compressor are presented in comparison to a conventional *** characteristics are explored for various tip clearance levels,axial spacings and circumferential *** impeller was modified to tandem-bladed design with no modifications in backsweep angle,meridional gas passage and camber distributions in order to have a true comparison with conventional *** degradation is observed for both the conventional and tandem designs with increase in tip ***-equation models for correlating stage characteristics with tip clearance are *** two designs,it is clearly evident that the conventional design shows better performance at moderate flow ***;near choke flow,tandem design gives better results primarily because of the increase in throat *** point flow rate also seems to drop for tandem compressor resulting in increased range of operation.

摘要：The lifespan of biological heart valve prostheses available in the market is limited due to structural alterations caused by calcium phosphate deposits formed from blood plasma in contact with the *** objective of this work is to present a comparative methodology for the investigation of the formation of calcium phosphate deposits on bioprosthetic and tissue-engineered scaffolds in vitro and the influence of mechanical forces on tissue *** on earlier investigations on biological mineralization at constant supersaturation,a circulatory loop simulating dynamic blood flow and physiological pressure conditions was *** system was appropriately adapted to evaluate the calcification potential of decellularized(DCV)and glutaraldehyde-fixed(GAV)porcine aortic *** indicated that DCV calcified at higher,statistically nonsignificant,rates in comparison with *** difference was attributed to the tissue surface modifications and cell debris leftovers from the decellularization *** analysis of the solids deposited after 20 h by scanning electron microscopy in combination with chemical microanalysis electron-dispersive spectroscopy identified the solid formed as octacalcium phosphate(Ca8(PO4)6H2·5H2O,OCP).OCP crystallites were preferentially deposited in high mechanical stress areas of the test ***,GAV tissues developed a significant transvalvular pressure gradient increase past 36 h with a calcium deposition distribution similar to the one found in explanted *** conclusion,the presented in vitro circulatory model serves as a valuable prescreening methodology for the investigation of the calcification process of bioprosthetic and tissue-engineered valves under physiological mechanical load.

摘要：Drop-on-demand (DOD) bioprinting has been widely used in tissue engineering due to its highthroughput efficiency and cost effectiveness. However, this type of bioprinting involves challenges such as satellite generation, too-large droplet generation, and too-low droplet speed. These challenges reduce the stability and precision of DOD printing, disorder cell arrays, and hence generate further structural errors. In this paper, a multi-objective optimization (MOO) design method for DOD printing parameters through fully connected neural networks (FCNNs) is proposed in order to solve these challenges. The MOO problem comprises two objective functions: to develop the satellite formation model with FCNNs;and to decrease droplet diameter and increase droplet speed. A hybrid multi-subgradient descent bundle method with an adaptive learning rate algorithm (HMSGDBA), which combines the multisubgradient descent bundle (MSGDB) method with Adam algorithm, is introduced in order to search for the Pareto-optimal set for the MOO problem. The superiority of HMSGDBA is demonstrated through comparative studies with the MSGDB method. The experimental results show that a single droplet can be printed stably and the droplet speed can be increased from 0.88 to 2.08 m·s^-1 after optimization with the proposed method. The proposed method can improve both printing precision and stability, and is useful in realizing precise cell arrays and complex biological functions. Furthermore, it can be used to obtain guidelines for the setup of cell-printing experimental platforms.

摘要：分散在纳米碳基底上的分子催化剂由于具有明确的活性位点和结构可调的特点,成为了一类独特的单原子催化剂,有望代替贵金属催化剂用于电催化氧还原反应.本文中,我们开发了一种高活性氧还原催化剂,该催化剂由均匀且密集分散在泡芙状石墨烯载体上的铁酞菁(FePc/PG)构成.泡芙状石墨烯载体由于具有独特的皱褶和球状形貌,具有较大的比表面积和多尺度的孔结构,有利于FePc的高密度负载、活性位点的暴露和催化过程中传质效率的提高.当用旋转圆盘电极评估性能时,FePc/PG表现出优异的半波电位,达0.909 V(相对于可逆氢电极).此外,当用作气体扩散电极时,FePc/PG在高电流密度下表现出优异的高倍率和高功率性能.这项工作为设计纳米碳材料的形貌以及高性能异相分子催化剂提供了有效的策略,有望在多种能源转换和存储技术中得到应用.

摘要：This novel face mask is designed to be a reusable respirator with a small and highly efficient disposable fabric *** material requirements are reduced by 75%compared to traditional designs and allow repeated cleaning or *** probability of virus particle inhalation is reduced using novel air filtration pathways,through square-waveform design to increase filter *** enters the mask from right and left side filters,while the area in front of the mouth is *** epoxy is used for a transparent frame,allowing lip-reading,and mask edges contain a silicone seal preventing bypass of the *** mask is manufactured using silicone molds,eliminating electricity requirements making it economical and viable in developing *** fluid dynamics numerical studies and Fluent ANSYS software were used to simulate airflow through the filter to optimize filter air path geometry and validate mask design with realistic human *** breathing cycle was represented as a transient function,and N95 filter specifications were selected as a porous *** novel design achieved 1.2×10^(−3) kg s^(−1),20%higher than human requirements,with air streamlines velocity indicating local high speed,forcing and trapping virus particles against filter walls through centrifugal forces.