摘要：目的:研究弹性体/金属配副在硬质颗粒环境下的摩擦磨损行为,分析有无颗粒及颗粒尺寸大小对摩擦学特性的影响,为橡塑密封设计提供参考。创新点:基于橡胶O型圈常见失效机制,模拟橡胶密封圈在颗粒介入时的摩擦磨损行为,探讨硬质颗粒及其颗粒尺寸对橡胶/金属摩擦配副的影响。方法:1.采用球/平面接触方式,开展丁腈橡胶/金属(316L)配副在Al2O3颗粒环境下的摩擦磨损行为,通过考察摩擦系数时变曲线、摩擦副磨损形貌及其损伤机制等特性,揭示Al2O3颗粒对丁腈橡胶/316L不锈钢配副摩擦磨损行为的影响。结论:***2O3颗粒进入橡胶/金属摩擦配副明显降低摩擦系数、硬质颗粒的犁削作用,加剧金属偶件的磨损;2.大尺寸的Al2O3颗粒能嵌入橡胶基体并加速橡胶的磨损,对金属有微切屑作用;然而随着颗粒尺寸的减小,颗粒反而减缓橡胶的磨损;3.在有无颗粒和不同颗粒尺寸的情况下,橡胶和金属均表现出不同的损伤机制。

摘要：3D打印技术是一种新兴的制造技术,其可以利用数字模型实现精准制造。近年来,3D打印技术已经被广泛应用于各个领域,包括食品、生物医药等。3D食品打印的优势在于能够制作复杂的食品模型、设计独特的图案以及精准定制。3D食品打印技术由挤出式打印、黏结剂喷射和喷墨打印组成,其利用食品材料,基于逐层堆积的方式设计造型。本文重点介绍了3D打印技术在食品中的最新研究进展,深入总结了3D打印技术在不同类型食品应用中的特点和局限性。同时,通过介绍食品的精准营养递送、贮藏保鲜、食品加工、生物制造等方面,详细分析了3D打印在食品行业的应用现状。最后展望了未来食品3D打印技术的发展,以期为3D打印与食品产业的深度融合提供理论指导。

摘要：在传统机械制造业转型升级的背景下，针对中小型制造企业在智能工厂建设、转变生产模式过程中的体系架构设计缺失、车间布局规划不合理、信息集成应用困难等问题，提出了一套应用于中小企业智能工厂建设的设计方法，并对该设计方法进行了实例验证。首先，根据中小企业的实际特点和发展目标设计了中小型企业智能工厂的体系架构模型，分析了智能工厂体系架构的组成内容及其相互关系；然后，对工厂布局规划方法进行了阐述，探索了智能工厂建设过程中车间生产布局的设计方法和实施流程，规划了企业信息化应用集成系统的框架与流程，实现了对车间生产数据的采集以及信息系统的集成融合；最后，以某企业为案例，对智能工厂规划设计方法在中小型传统机械制造业的应用进行了验证。研究结果表明：采用该方法后，与传统制造模式和生产过程相比，产能提高了53.8%,用工成本降低了20%,提高了企业的生产水平。这证明该方法对推动中小企业改善传统生产方式和运营模式有积极的促进作用。

摘要：邓小平作为改革开放的总设计师,在从事中国特色社会主义建设的伟大实践和理论创造中,始终是群众路线思想坚定的拥护者和执行者,并赋予了群众路线以鲜明的时代内容和时代特色。当前,改革开放进入深水区和关键期,重温邓小平的群众路线思想,对于我们从改善和密切党群关系、领导干部树立正确的政绩观、推进社会公平正义等诸方面去化解矛盾,进一步深化改革开放,构建和谐社会,实现中华民族伟大复兴的中国梦具有重要的现实意义。

摘要：As the idea of simulated annealing (SA) is introduced into the fitness function, an improved genetic algorithm (GA) is proposed to perform the optimal design of a pressure vessel which aims to attain the minimum weight under burst pressure con- straint. The actual burst pressure is calculated using the arc-length and restart analysis in finite element analysis (FEA). A penalty function in the fitness function is proposed to deal with the constrained problem. The effects of the population size and the number of generations in the GA on the weight and burst pressure of the vessel are explored. The optimization results using the proposed GA are also compared with those using the simple GA and the conventional Monte Carlo method.

摘要：新菠萝灰粉蚧Dysmicoccus neobrevipes(Beardsley)是一种严重为害剑麻、番荔枝等经济作物的入侵性害虫。由于粉蚧类昆虫体型较小,且外部形态十分相似,难以达到快速准确识别。本文利用分子标记技术,研究了新菠萝灰粉蚧的快速鉴定方法。通过对新菠萝灰粉蚧、扶桑绵粉蚧、双条拂粉蚧、杰克贝尔氏粉蚧、大洋臀纹粉蚧、木槿曼粉蚧、甘蔗粉蚧和木瓜粉蚧等8种粉蚧的序列进行分析,针对新菠萝灰粉蚧设计了1对特异性引物,其扩增片段大小为552 bp(Gen Bank登录号为MF 363108),该引物对其它7种粉蚧没有扩增能力。该引物不仅对新菠萝灰粉蚧成虫具有扩增效能,对1龄若虫、2龄若虫和3龄若虫都具有同样的扩增能力,其最低检出阈值为437.5 pg/μL。该技术的建立,实现了在剑麻等苗木调运过程中对新菠萝灰粉蚧的快速准确鉴定,同时对新菠萝灰粉蚧的检疫和监测也具有重要的意义。

摘要：This paper proposes a theoretical method using finite element analysis(FEA) to calculate the plastic collapse loads of pressure vessels under internal pressure,and compares the analytical methods according to three criteria stated in the ASME Boiler Pressure Vessel Code. First,a finite element technique using the arc-length algorithm and the restart analysis is developed to conduct the plastic collapse analysis of vessels,which includes the material and geometry non-linear properties of vessels. Second,as the mechanical properties of vessels are assumed to be elastic-perfectly plastic,the limit load analysis is performed by em-ploying the Newton-Raphson algorithm,while the limit pressure of vessels is obtained by the twice-elastic-slope method and the tangent intersection method respectively to avoid excessive deformation. Finally,the elastic stress analysis under working pressure is conducted and the stress strength of vessels is checked by sorting the stress results. The results are compared with those obtained by experiments and other existing models. This work provides a reference for the selection of the failure criteria and the calculation of the plastic collapse load.

摘要：In order to meet the requirements of the Circular Electron Positron Collider(CEPC),a 650-MHz 2-cell superconducting cavity was proposed and *** this study,we show the progress in the cavity design for the *** radio frequency and mechanical designs are ready for the first design version,called CEPC-V1.A cryomodule,which consists of two 650-MHz 2-cell cavities,was scheduled the last ***,prototypes of the 2-cell cavity based on this design were fabricated and tested the following *** vertical test results show that multipacting(MP)exists from 10 to 19 MV/*** will increase the operational risk of the CEPC,while the continuous-wave operation for the 650-MHz cavity is 19.7 MV/*** trapped modes were also found,which exist because of the identical half-cell ***,a few improvements regarding MP and more efficient extraction of higher-order mode power are discussed.A new type of cavity design,called CEPC-V2,is also discussed in this paper.

摘要：Due to the long-term plate tectonic movements in southwestern China,the in-situ stress field in deep formations is *** passing through deep soft-rock mass under non-hydrostatic high in-situ stress field,tunnels will suffer serious asymmetric *** is no available support design method for tunnels under such a situation in existing studies to clarify the support time and support *** study first analyzed the mechanical behavior of tunnels in non-hydrostatic in-situ stress field and derived the theoretical equations of the ground squeezing curve(GSC)and ground loosening curve(GLC).Then,based on the convergence confinement theory,the support design method of deep soft-rock tunnels under non-hydrostatic high in-situ stress field was established considering both squeezing and loosening *** addition,this method can provide the clear support time and support stiffness of the second layer of initial *** proposed design method was applied to the Wanhe tunnel of the China-Laos railway in *** data indicated that the optimal support scheme had a good effect on controlling the tunnel deformation in non-hydrostatic high in-situ stress *** applications showed that the secondary lining could be constructed properly.

摘要：Light trapping is a constant pursuit in photonics because of its importance in science and *** mechanisms have been explored,including the use of mirrors made of materials or structures that forbid outgoing waves,and bound states in the continuum that are mirror-less but based on *** we report a compound method,combining lateral mirrors and bound states in the continuum in a cooperative way,to achieve a class of on-chip optical cavities that have high quality factors and small modal ***,light is trapped in the transverse direction by the photonic band gap of the lateral hetero-structure and confined in the vertical direction by the constellation of multiple bound states in the *** a result,unlike most bound states in the continuum found in photonic crystal slabs that are de-localized Bloch modes,we achieve light-trapping in all three dimensions and experimentally demonstrate quality factors as high as Q=1.09×10^(6)and modal volumes as low as V=17.74(λ_(0)/n)^(3)in the telecommunication *** further prove the robustness of our method through the statistical study of multiple fabricated *** work provides a new method of light trapping,which can find potential applications in photonic integration,nonlinear optics and quantum computing.