摘要：硬车削是一种能够部分代替磨削的先进加工工艺,但是其对机床的动态特性有很高的要求。使用Ansys workbench对应用在斜床身上采用静压导轨的机床十字滑台部件进行动力学建模,借助有限元法分析含结合部动态参数的机床关键部件的模态,研究了硬车削机床十字滑台部件的动态特性问题。研究成果可对该硬切削机床的十字滑台部件的结构设计提供了理论参考。

摘要：Hierarchical FeP nanoarray films composed of FeP nanopetals were successfully synthesized via a bio-inspired hydrothermal route followed by phosphorization. Glycerol as a crystal growth modifier, plays a significant role in controlling the morphology and structure of the FeO（OH） precursor during the biomineralization process, while the following transfer and pseudomorphic transformation of the FeO（OH） film successfully give rise to the FeP array film. The as-prepared FeP film electrodes exhibit excellent hydrogen evolution reaction （HER） performance over a wide pH range. Theoretical calculations reveal that the mixed P/Fe termination in the FeP film is responsible for the high catalytic activity of the nanostructured electrodes. This new insight will promote further explorations of efficient metal phosphoride-based catalysts for the HER. More importantly, this study bridges the gap between biological and inorganic self-assembling nanosystems and may open up a new avenue for the preparation of functional nanostructures with application in energy devices.

摘要：As the revitalization of city culture and the city cultural confidence has been increasingly valued, the ancients' perception and interpretation of mountains, rivers and cultural landscapes, as well as their wisdom in the construction of traditional cities deserve more attention and further exploration. Taking ancient Yiyang City for example, this paper on the basis of local chronicles and literature analyzed the construction history of the city, famous mountains and rivers, and top eight views, and attempted to interpret the construction system of "mountain, river and city" landscape of traditional Chinese cities, in order to provide historical basis and cultural background for revitalizing local cultures and shaping urban landscape patterns, and offer spatial strategies for the city protection and renewal.

摘要：Systems that are subject to both time-delay in state and input saturation are considered. We synthesize the anti-windup gain to enlarge the estimation of domain of attraction while guaranteeing the stability of the closed-loop system. An ellipsoid and a polyhedral set are used to bound the state of the system, which make a new sector condition valid. Other than an iterative algorithm, a direct designing algorithm is derived to compute the anti-windup compensator gain, which reduces the conservatism greatly. We analyze the delay-independent and delay-dependent cases, respectively. Finally, an optimization algorithm in the form of LMIs is constructed to compute the compensator gain which maximizes the estimation of domain of attraction. Numerical examples are presented to demonstrate the effectiveness of our approach.

摘要：在轴流式血泵的研发过程中,动脉局部流场中可能产生流动剪切率非常低的区域,因此有必要考虑血液的非牛顿特性。建立了轴流式血泵模型,通过CFD仿真分析得到血泵转速和流量的变化对血泵出入口压力分布和速度分布的影响,并采用水和甘油(2∶1)的混合流体替代血液,对设计的血泵进行驱动实验,测量了轴流式血泵输出流量和压力参数。结果表明:所设计的血泵在规律上和仿真是相符的。

摘要：In order to improve the strength and corrosion resistance of CoCrNi medium entropy alloy,TiC strengthened CoCrNi medium entropy alloy(CoCrNi/(TiC)_(x)(x=0.1,0.2,0.4))was designed by addition of different amounts of *** effects of TiC content on the microstructure,mechanical properties,and corrosion resistance of the alloy were *** was found that the precipitation morphologies of TiC changed from lamellar eutectic to needle structure with the increase of TiC content,and finally formed mixed needled and bulk TiC *** appears as a dissolution−precipitation phenomenon in the CoCrNi alloy,which is important for the mechanical properties and corrosion resistance of the CoCrNi/(TiC)_(x) *** strength of alloy was enhanced obviously after the addition of *** compressive yield strength of CoCrNi/(TiC)_(0.4) alloy reached 746 MPa,much larger than that of the CoCrNi medium entropy alloy,108 ***,the addition of TiC was found to improve the corrosion resistance of CoCrNi medium entropy alloy in the salt solution.

摘要：Formal methods offer the promise of significant improvement on quality and reliability of critical embedded software. B-Method is employed to develop general-service ballistic computer programs in the paper, each of which can be adapted to a family of service/weapon-specific ballistic computers. Based on the structuring mechanisms of B-method, a unified approach is proposed to systematically control the complexity of ballistic parameters in the process of type and operation refinement, and ultimately a series of high reliable, reusable, and scalable programs are produced. Experiences with the application of the method and tools are also discussed.

摘要：为了研究带裂纹工件在超声载荷下的疲劳性能,采用自行研制的超声振动单向拉伸实验装置,对刻槽20#钢进行了拉伸试验研究。设计了两端方板、中间为指数剖面、单侧边开有缺口的试件,对刻槽试件的应力状态进行了理论分析,得出了刻槽截面的正应力分布公式。通过改变工件的槽深t和曲率ρ,得出疲劳极限随刻槽深度的加深而降低,在某一深度时达到最小值,然后随之上升;疲劳极限随刻槽曲率的减小而下降,在某一曲率值时达到最小值,然后随之上升。该试验证明了疲劳极限不仅与应力集中系数有关,还与刻槽深浅、应力梯度和其他参数有关,具体工作还需要进一步研究。

摘要：In view of the important prestige of Zhang Heng’s seismoscope in world culture,scholars in different countries have performed restoration research,however,so far all restored models have only reached the drawing design and exhibition stage. In recent decades,new research achievements on historical materials,archaeology and historical seismology have been made in Chinese academic society,which lay a good foundation for the establishment of a new restored model. Not only does the new model more accord with historical materials,but it can be used to detect earthquakes for the first time. This paper will introduce the restoration in four aspects: scientific train of thought,structural restoration,formation restoration and scientific testing.

摘要：We implement a parallel algorithm with the advantage of MPI （Message Passing Interface） to speed up the rapid relaxation inversion for 3D magnetotelluric data. We test the parallel rapid relaxation algorithm with synthetic and real data. The execution efficiency of the algorithm for several different situations is also compared. The results indicate that the parallel rapid relaxation algorithm for 3D magnetotelluric inversion is effective. This parallel algorithm implemented on a common PC promotes the practical application of 3D magnetotelluric inversion and can be suitable for the other geophysical 3D modeling and inversion.