行进绳索在横向流体激励下的运动

给出横向流体对行进绳索的作用力描述，建立了绳索的动力学方程．由于该方程具有零刚度特征，引入Ｐｉｌｉｐｃｈｕｋ变换，以自平衡状态起度量的径向振动和回转运动来描述绳的运动，获得非零刚度系统．然后，用两变量参数振动法求得绳索关于扩张振动和回转运动的约化型，使得绳索运动可近似由一个二维动力系统来描述．最后，用数值方法讨论了行进速度和重力对绳索运动形态的影响．

横向流体激励下绳索的动力学分析

通过分析横向流体对绳索的作用力 ,建立了绳索的动力学方程。借助 Pilipchuk坐标变换 ,使具有零刚度的绳索动力学方程包含静刚度项 ,继而使用两变量摄动方法对绳索运动进行近似分析。然后 ,用数值方法考核了近似分析结果的可靠性 ,讨论了流体速度、绳索质量、重力和初始状态等对绳索运动行为的影响。

搅拌槽内横向流体作用力特性的测试与研究

采用应变片测量技术和数据采集系统，测量了搅拌轴上端部所受的弯矩，得到了搅拌桨的流体作用力特性曲线及横向流体作用力的频谱图。

重组酶聚合酶扩增结合横向流体试纸条快速检测人腺病毒

目的 建立一种快速、敏感的人腺病毒等温核酸扩增检测方法.方法 针对人腺病毒hexon基因保守区序列设计特异性重组酶聚合酶扩增（RPA）引物及探针、优化反应时间和温度、用横向流体试纸条（LFD）和毛细管电泳检测扩增产物,建立人腺病毒RPA-LFD快速检测方法,评价该方法的敏感度和特异性并与Real-time PCR法比较.结果 RPA-LFD方法检测人腺病毒的最低检出限为2拷贝DNA分子/反应,且与其他呼吸道病原无交叉反应,临床样本检测结果与Real-time PCR法一致性为100％.结论 建立的RPA-LFD方法具有敏感性、特异性高、快速且不需要昂贵的仪器设备等优点,为人腺病毒快速检测提供了新工具.

磁流体力学方程组的激波生成

研究磁流体横向流动的一维模型 ,在解的强间断出现后流场的性质· 利用迭代法具体构造了该方程组的强间断—激波以及问题的熵解· 同时 ,利用激波的性质 。

Application of seismic anisotropy fluid detection technology in the Ken 71 well block of Shengli Oilfield

On the basis of Chapman＇s（2003） model,as the seismic wave incidences angles vary from 0° to 45° while propagating in anisotropic media（HTI）,the slow S-wave will sufferred by serious attenuation and dispersion and is sensitive to fluid viscosity but the P-and fast S-waves don＇t.For slow S waves propagating normal to fractures,the amplitudes are strongly affected by pore fluid.So,the slow S-wave can be used to detect fractured reservoir fluid information when the P-wave response is insensitive to the fluid.In this paper,3D3C seismic data from the Ken 71 area of Shengli Oilfield are processed and analyzed.The travel time and amplitude anomalies of slow S-waves are detected and correlated with well log data.The S-wave splitting in a water-bearing zone is higher than in an oil-bearing zone.Thus,the slow S-wave amplitude change is more significant in water-bearing zones than in oil-bearing zones.

Numerical simulation of(T_2,T_1) 2D NMR and fluid responses

One-dimensional nuclear magnetic resonance （1D NMR） logging technology is limited for fluid typing, while two-dimensional nuclear magnetic resonance （2D NMR） logging can provide more parameters including longitudinal relaxation time （71） and transverse relaxation time （T2） relative to fluid types in porous media. Based on the 2D NMR relaxation mechanism in a gradient magnetic field, echo train simulation and 2D NMR inversion are discussed in detail. For 2D NMR inversion, a hybrid inversion method is proposed based on the damping least squares method （LSQR） and an improved truncated singular value decomposition （TSVD） algorithm. A series of spin echoes are first simulated with multiple waiting times （Tws） in a gradient magnetic field for given fluid models and these synthesized echo trains are inverted by the hybrid method. The inversion results are consistent with given models. Moreover, the numerical simulation of various fluid models such as the gas-water, light oil-water, and vicious oil-water models were carried out with different echo spacings （TEs） and Tws by this hybrid method. Finally, the influences of different signal-to-noise ratios （SNRs） on inversion results in various fluid models are studied. The numerical simulations show that the hybrid method and optimized observation parameters are applicable to fluid typing of gas-water and oil-water models.

Dynamical separation of rigid bodies in supersonic flow

A computational investigation of the unsteady separation behavior of rigid bodies in Mach-4 flow is carried out. Two rigid bodies, a sphere and a cube, initially stationary, centroid axially aligned, are released and thereafter fly freely according to the aerodynamic forces experienced. During the separation process, the smaller cube can experience different types of movement and our principal interest here is the non-dimensional transverse velocity of it. The separation behavior is investigated for interactions between a sphere and a cube with different mass ratio and a constant initial distance between them. The qualitative separation behavior and the final transverse velocity of the small body are found to vary strongly with the mass ratio but less sensitive to the initial distance between the two bodies. At a critical mass ratio for a given distance, the smaller body transit from entrainment within the flow region bounded by the larger body's shock to expulsion and the accumulated transverse velocity of the small body is close to maximum. This phenomenon is the so-called ‘shock-wave surfing' phenomenon noted by Laurence & Deiterding for two spheres at hypersonic Mach numbers. Then we investigate the separation behavior of a sphere interaction with a rotary cube and with a non-rotary cube for a given mass ratio and different distance between them. The rotary is found to increase the likelihood of ‘surfing'. Only at a certain initial distance for a given mass ratio the rotary effect of cube can be neglectable.

Channel flow of the lower crust and its relation to large-scale tectonic geomorphology of the eastern Tibetan Plateau

The Tibetan Plateau is a large-scale tectonic geomorphologic unit formed by the interactions of plates.It has been commonly believed that convective removal of the thickened Tibetan lithosphere,or lateral flow of the lower crust beneath the Tibetan plateau plays a crucial role in the formation of the large-scale tectonic geomorphologic features.Recent geological and geo-physical observations have provided important evidence in support of the lower crustal channel flow model.However,it re-mains unclear as how the geometry of lower crustal channel and the lateral variation of crustal rheology within the lower crust channel may have affected spatio-temporal evolution of the tectonic geomorphologic unit of the Tibetan Plateau.Here,we use numerical methods to explore the mechanical relations between the lower crustal channel flow and the tectonic geomorpho-logic formation around the eastern Tibetan plateau,by deriving a series of governing equations from fluid mechanics theory.From numerous tests,our results show that the viscosity of the channeled lower crust is about(1-5)×1018 to(1-4)×1020 Pa s(Pa.s) beneath the margin of the eastern Tibetan Plateau,and increases to about 1022 Pa s beneath the Sichuan Basin and the southern region of Yunnan Province.Numerical tests also indicate that if channel flows of the lower crust exist,the horizontal propagation and the vertical uplifting rate of the eastern Tibetan Plateau margin could be accelerated with the time.Thus,the present results could be useful to constrain the rheological structure of the crust beneath the eastern Tibetan plateau,and to understand the possible mechanics of rapid uplift of the eastern Tibetan Plateau margin,especially since its occurrence at 8Ma as revealed by numerous geological observations.