摘要：Periosteum,a membrane covering the surface of the bone,plays an essential role in maintaining the function of bone tissue—and especially in providing nourishment and vascularization during the bone regeneration ***,most artificial periostea have relatively weak mechanical strength and a rapid degradation rate,and they lack integrated angiogenesis and osteogenesis *** this study,a bi-layer,biomimetic,artificial periosteum composed of a methacrylated gelatin–nano-hydroxyapatite(GelMA-nHA)cambium layer and a poly(N-acryloyl 2-lycine)(PACG)-GelMA-Mg^(2+)fibrous layer was fabricated via 3D *** GelMA-nHA layer is shown to undertake the function of improving osteogenic differentiation of rat bone marrow mesenchymal stem cells with the sustainable release of Ca^(2+) from nHA *** hydrogen-bonding-strengthened P(ACG-GelMA-L)-Mg^(2+)hydrogel layer serves to protect the inner defect site and prolong degradation time(60 days)to match new bone ***,the released magnesium ion exhibits a prominent effect in regulating the polarization phenotype of macrophage cells into theM2 phenotype and thus promotes the angiogenesis of the human umbilical vein endothelial cells in *** bi-layer artificial periosteum was implanted into a critical-sized cranial bone defect in rats,and the 12-week post-operative outcomes demonstrate optimal new bone regeneration.

摘要：To understand fundamental problems in hypersonic laminar-turbulent boundary layer transition for three-dimensional complex vehicles,a new standard model with typical lifting-body features has been proposed,named as hypersonic transition research vehicle(HyTRV).The configuration of HyTRV is fully analytical,and details of the design process are discussed in this *** transition characteristics for HyTRV are investigated using three combined methods,i.e.,theoretical analyses,numerical simulations,and wind tunnel *** show that the fully analytic parameterization design of HyTRV can satisfy the model simplification requirements from both numerical simulations and wind tunnel ***,the flow field of HyTRV reveals typical transition mechanisms in six relatively separated regions,including the streamwise vortex instability,crossflow instability,secondary instability,and attachment-line ***,the proposed HyTRV model is valuable for fundamental researches in hypersonic boundary layer transition.

摘要：恰当的广告效果呈现会显著提升消费者感知,而达到广告效果的时间距离则是消费者对改变类产品的关注重点,直接影响其广告态度与购买决策。基于解释水平理论,本文通过4个实验验证了广告效果呈现方式(前后式vs.渐进式)与时间距离(远vs.近)的匹配效应:对于较长时间才能达到效果(时间距离远)的改变类产品,消费者对前后式广告具有更积极的态度;而对于较短时间即可达到效果(时间距离近)的改变类产品,消费者对渐进式广告的态度更积极,意象流畅性中介了该匹配效应。本研究结论拓展了广告效果呈现的相关研究,为企业提升改变类产品广告效果提供了新的启示。

摘要：随着互联网和移动计算等技术的发展,人们的在线行为产生了越来越多的数据,想要从海量数据中挑选出用户可能喜欢的物品,推荐系统不可或缺.然而传统的推荐算法需要将用户数据收集到服务端才能构建模型,这会泄露用户隐私.最近,谷歌针对机器学习任务中需要收集用户数据才能进行建模的问题,提出了一种新的学习范式——联邦学习.联邦学习与推荐系统相结合,使得联邦推荐算法能够在模型构建过程中,始终将用户数据保留在客户端本地,从而保护了用户隐私.本文主要对联邦学习与推荐系统相结合的研究工作进行综述,并从架构设计、系统的联邦化和隐私保护技术的应用3个角度重点分析联邦推荐算法的研究进展.最后,对基于联邦学习的推荐系统可研究的方向进行展望.

摘要：We present a 3-D finite element (FE) approach to find the optimal distribution of seismic reinforcement force to secure high arch dam-abutment structures against certain earthquake actions. Nonlinear FE time history analysis is performed on the structure to find the seismic responses, using the associated elastic-perfectly plastic material description. The concept of plastic complementary energy is introduced to structural dynamics to quantify the structure's resistance against the seismic action throughout the time history and to indicate the critical moments when extreme extents of dynamic failure occur. Meanwhile the distributions of the unbalanced force at these critical moments reveal the dominant patterns of the dynamic failure. By the principle of minimum plastic complementary energy, the unbalanced force is just the counterforce of optimal reinforcement force to secure the self-unsupportable structure against the earthquake, which makes the seismic design more targeted and effective. Seismic design analysis is performed on Maji high arch dam-abutment structure. The results could to a large extent guide the seismic design, showing that several structural surfaces lying at the upper abutment are the most seismically vulnerable. This application indicates good applicability of this approach to large-scale projects.

摘要：基于缩尺模拟试验,通过改变涵洞两侧地基压缩模量用于模拟堤-涵差异沉降,揭示涵顶加筋作用机理,确定路堤堆载条件下涵顶土压力分布规律,并推导建立土压力计算公式。研究结果表明:同等地基模量条件下,加筋路堤下的涵顶土压力明显高于普通路堤,且随格栅层数增加,堤-涵相对位移减少;同等加筋条件下,地基压缩模量越小,堤-涵相对位移及涵顶土压力均越大;综合土拱效应与加筋作用机理,建立加筋路堤下涵顶土压力计算公式,并与模型试验结果进行可靠性验证。研究结果可为加筋路堤下涵洞结构设计提供依据。

摘要：To improve the accuracy of the stator winding fault diagnosis in induction motor,a new diagnostic method based on the Hilbert-Huang transform(HHT)was *** ratio of fundamental zero sequence voltage to positive sequence voltage after switch-off was selected as the stator fault characteristic,which could effectively avoid the influence of the supply unbalance and the load fluctuation,and directly represent the asymmetry in the *** the empirical mode decomposition(EMD)based on HHT,the zero sequence voltage after switch-off was decomposed and the fundamental component was ***,the fault characteristic can be *** results on a 4-kW induction motor demonstrate the feasibility and effectiveness of this method.

摘要：采用紫外皮秒激光在As_2Se_3玻璃表面以线扫描形式快速制备大面积周期性点阵式增透微结构,获得了红外透光性能提高的硫系玻璃样品。研究确定了As_2Se_3玻璃的激光刻蚀阈值,并研究设计了合适线扫描工艺方法。所制样品相对于原样在波长11.0μm^12.4μm范围内,透过率平均提高10.0%;波长13.0μm^14.2μm范围内,透过率平均提高5.2%。激光扫描制备方法没有破坏样品表面原有的浸润性,整个制备过程均在空气开放环境下进行,成本低,工艺可控性强,效率高,制备8 mm×8 mm的表面微结构,仅用时3.65 s,且表面微结构单元尺寸及间距可按材料应用需求调控。分析表明,当激光能量较低时,对该硫系玻璃的去除以"冷加工"为主,不会有明显的热效应,得到微结构的硫系玻璃表面元素组成未发生改变;激光能量较高时,会存在一定的热效应,使得刻蚀点出现熔融态,在微坑边缘出现凸起或翻边。

摘要：在广告中合理地使用隐喻修辞可以提高消费者的注意效果,但已有文献还没有厘清广告中的隐喻修辞在网络环境下影响消费者注意力的适用范围。本研究借助眼动追踪技术,采用2(修辞表现形式:隐喻,直述)×2(知觉负荷:高,低)×2(视觉显著性:高,低)的三因素混合实验设计探究网络横幅广告中的隐喻修辞对消费者注意效果的作用边界。研究发现:横幅广告中的隐喻修辞对消费者注意效果的影响受到消费者的知觉负荷和广告的视觉显著性的调节作用,三项交互效应结果显示,当个体具有低知觉负荷同时广告具有高的视觉显著性时,广告中的隐喻修辞最能发挥其注意优势。本研究结论对隐喻修辞在网络广告情境下的研究文献进行了的补充,并为营销人员如何在网络营销中开展隐喻横幅广告策略提出了实践启示。

摘要：合理地使用拟人化策略可以提升广告的记忆效果,但以往研究并未厘清拟人化广告在网络情境中的适用边界。本文以网络横幅广告为研究对象,尝试通过2(广告类型:拟人化,非拟人化)×2(知觉负荷:高,低)×2(视觉显著性:高,低)的三因素混合实验探究拟人化对横幅广告记忆效果的影响边界。结果表明:知觉负荷和视觉显著性均显著调节拟人化横幅广告的记忆效果,只有在低知觉负荷任务或横幅广告的视觉显著性高时,广告拟人化的记忆优势才能体现。三因素的交互效应进一步显示,在低知觉负荷和高视觉显著性的组合下,拟人化广告的记忆效果最优,但在高知觉负荷和低视觉显著性的组合下,拟人化策略的记忆优势将不复存在。本文研究结果填补了拟人化广告在网络情境下的研究缺口,并为企业进行网络广告投放策略提供了实践建议。