摘要：This article examines the complex interplay between abstraction and representation in the ontology of *** inhabit an in-between space as tangible artifacts that also convey intangible ideas and *** analysis synthesizes perspectives from across the history of philosophy to elucidate how images bridge abstraction and representation through their form and *** engages with ongoing epistemological and aesthetic debates concerning the dual nature of ***’s theory of ideal forms is outlined as an early attempt to define *** semiotic theories are discussed for their insights into how images create meaning through codes and *** offers an alternative approach by prioritizing the sensorial,affective impact of *** problematizes representation in the context of mechanical reproduction and *** diverse,these philosophical frameworks all grapple with the issues images pose between abstract essence and concrete appearance,conceptual ideas and sensory *** article reveals the richness of images as liminal constructs that collapse dualisms in their creative interfacing of material forms and immaterial *** concludes that this ontological ambiguity empowers images as mediators between imagination and perception,subjectivity and reality.

摘要：基于Jeffcott转子模型,结合涡轮的经典阿尔福德(Alford)力流固耦合动力学模型,建立了考虑涡轮Alford力的系统运动方程,通过理论分析导出了表征系统动力学性能的模态阻尼与频率、振幅对数衰减率以及动力放大系数等的解析表达式。最后通过图形分析了涡轮Alford力对转子系统动力学性能的影响,给出了一些可用于指导转子系统动力学设计和故障诊断的结论。分析表明,Alford力会促进正向涡动而抑制反向涡动,增大正、反向涡动的模态频率,降低正向涡动的稳定性,而提高或降低反向涡动的稳定性则取决于系统的相对阻尼,增大或减小系统的动力放大系数则取决于比转速,并改变系统响应的相位。

摘要：为实现船用液体燃料蜗壳旋流器的可靠性点火,提高其燃烧的稳定性和燃烧效率,采用RNG k-ε双方程湍流模型,设计出一种满足船用特殊需要的蜗壳旋流器,列举了7组不同戊烷和空气进口流量,对该具体尺寸的蜗壳旋流器的液雾燃烧过程进行了数值模拟和试验验证,得到了蜗壳旋流器内部流场以及出口处的烟气温度场和燃烧产物的组分浓度分布。分析对比这7组进口流量对该蜗壳旋流器的出口温度和出口气体组分的影响,找到了满足船用需要的该具体尺寸蜗壳旋流器对应的最佳燃料进口流量。该模拟和试验结果为蜗壳旋流器的结构设计提供了理论依据。

摘要：通过接触单元来数值模拟压力容器快开门法兰的接触过程,得到了其受力特性和应力分布规律,并对其危险截面进行了强度评定和疲劳分析。

摘要：结合烟草制造业的行业特点和实际应用需求,提出了三层架构模式的烟草行业CIMS体系结构。同时,本文分析研究了卷烟配方辅助设计子系统,填补了行业产品设计领域信息化的空白,丰富了流程制造业CIMS体系的技术内涵和系统实现手段。

摘要：依据流体力学的粘性阻力理论,以运动的转子构件———圆柱体为主体,利用矢量分析方法,导出了圆柱体在流体中横向振动时受到的流体阻力解析表达式.分析结果表明圆柱体在流体中横向振动时受到的阻力包括惯性项和阻尼项两部分,其动特性系数不仅与流体性质及圆柱体的结构尺寸有关,而且还与圆柱体的振动角速度有关.同时发现,惯性项中除了包括圆柱体在理想流体中横向振动时受到的惯性阻力外还增加了与粘性有关的部分;而阻尼项则由与粘性有关的两部分组成,其中一部分与流体密度有关,而另一部分与流体密度无关.导出的公式可用于转子系统的流固耦合动力学有限元建模,同时对流体机械及潜液机械构件的动力学设计具有一定指导意义.

摘要：为提高锻态Ti_(2)AlNb基合金后续热变形能力,对多向锻造后的Ti_(2)AlNb基合金进行了固溶+时效的热处理。研究分析了热处理前后的组织演变、力学性能以及O相的析出行为。结果表明:多向锻造后的空冷的Ti_(2)AlNb合金,组织内析出大量针状O相,位错密度高,晶粒尺寸大,导致其伸长率较低。经过热处理后形成了B2基体+双尺板条/针状O相组织,位错密度降低,α_(2)相以包析反应生成了rim-O相;晶粒内部的析出O相包含4种变体。O相在小角度晶界处沿两侧生长分布,而在大角度晶界处只沿单侧析出生长。热处理后的Ti_(2)AlNb合金表现出显著提高的伸长率,增加了后续热变形的稳定性。

摘要：Cyclic dinucleotides(CDNs) are known to activate stimulator of interferon genes(STING) and induce type I interferon responses, therefor possess great potentials to be of immunotherapeutic value for cancers and infectious diseases. However, the existence of different single nucleotide polymorphism(SNP) of human STING(hSTING) gene poses an obstacle to achieve broad-spectrum activation by CDNs. We reported here the design and synthesis of a total of 36 CDNs, representing all structural variations, that contain four bases(A, G, C, U) and two linkage directions(2′-5′-linked and 3′-5′-linked phosphodiester).Through systematic evaluation of IFN-β induction with a dual-luciferase reporter assay, we discovered that wild type hSTING and two isoforms(HAQ and AQ) showed strong response while hSTING-R232 H and R293 Q exhibited the relatively weak response to CDNs stimulation. For the first time, we found that the c[G(2′,5′)U(2′,5′)] showed excellent activity against all five hSTING variants even equivalent to the endogenous ligand c[G(2′,5′)A(3′,5′)]. Furthermore, we have also demonstrated that 3′-3′CDNs with two 3′-5′ phosphodiesters showed higher serum and hydrolase stability than 2′-2′ CDNs with two 2′-5′ phosphodiesters and 2′-3′ CDNs with one 2′-5′ and one 3′-5′ phosphodiester. It is very interesting to note that 2′-2′ CDNs has been found for the first time to show strong activity. These findings will stimulate our exploration for the new functional role of CDNs, and provide guidelines to design CDNs based hSTING targeted drugs.

摘要：随着国家网络安全政策的不断完善,安全市场处于政策红利期。如何在有限的资源条件下,将分散的安全能力贯通,打破资源共享壁垒,打造一体化安全智能运营体系,对内赋能生产,对外输出能力,成为电信运营商急需解决的难题。本方案提出一种基于大模型的安全运营与态势感知、安全编排与自动化响应、安全能力底座组成的“头-躯干-手脚”3级架构,可有效实现安全能力整合和任务智能调度,既可优化公司内部现有流程,又能更好实现能力外输变现。

摘要：为解决非独立同分布的节点数据导致的全局共享层特征提取能力下降的问题,提出一种基于社区发现和表征对比的参数解耦联邦学习方法。基于共享层深层的参数更新构建联邦社交网络,降低用于客户端关系建模的数据通信量;设计社区发现算法在联邦社交网络中的适配策略,为每个社区聚合专用的共享层,增强模型的个性化性能;提出一种社区模型对比损失约束节点模型梯度更新的方向,利用社区间的知识加速模型收敛。3个数据集上的实验结果表明,所提方法比先进的参数解耦联邦学习方法有更高的分类精度与更快的收敛速度。