新型压疮防护系统对压疮高危风险病人的防护作用的研究

[目的]探讨新型压疮防护系统对压疮高风险病人的压疮预防性作用。[方法]选取吉林省人民医院2015年2月—2017年2月具有压疮高风险（Braden评分〈12分）的住院病人126例,首先给予常规压疮预防护理45例作为对照组,后81例病人给予新型压疮防护系统作为预防性的措施为实验组,通过观察两组的皮肤情况,统计病人的压疮发生率和评价病人的舒适度。[结果]实验组病人住院第2天、住院第7天压疮发生率低于对照组,差异有统计学意义。[结论]新型压疮防护系统能降低压疮高风险病人的压疮发生率。吉林省卫生计生委课题,编号：2015SZC1

运动对颈动脉血流特性的影响

颈动脉粥样硬化是脑梗死等心血管疾病发生的主要原因。研究血液流动对其成因的影响对颈动脉粥样硬化的预防和治疗有着重要的作用。本研究数值模拟了两个不同颈动脉窦膨大程度和不同前端曲率的颈动脉模型C1、C2,研究了常规有氧运动和久坐对青年、中年、老年三个年龄组颈动脉血流的影响。模拟结果显示,在心脏跳动周期中不同时刻,有氧运动和久坐对颈动脉血流和血管壁面剪应力的影响是不同的,但并未对振荡剪切指数产生显著的影响。同时研究了有氧运动和久坐对反向流量的影响,发现在颈动脉窦膨大程度低且前端曲率高的颈动脉模型C1中,运动会增加青年组颈动脉中的反向流量,减少老年组颈动脉中的反向流量,而对于中年组,运动会增加颈动脉窦中部的反向流量,减少颈动脉分支附近的反向流量。在颈动脉窦膨大程度高且前端曲率低的颈动脉模型C2中,运动增加了所有年龄组颈动脉中的反向流量。以上结果表明评估运动对动脉粥样硬化的影响应该充分考虑患者特定的颈动脉几何形状和年龄

Effects of exercise on flow characteristics in human carotids

Carotid is one of the focal regions prone to atherosclerosis. Previous studies have shown that hemodynamics plays an important role in the initiation and formation of atherosclerosis plaques. In this work, we numerically investigate the flow patterns in two carotids with different flares and proximal curvatures under inflows from three age groups with/without exercise. The simulation results show that the effects of exercising on the carotid flow and wall shear stress are different at different time instants and for different age groups. As for the oscillatory shear index, exercise does not have significant effects. The effects of inflow waveforms on the reversed flow volume are also examined. For the carotid C1 with low flare and high proximal curvature, it is found that exercising increases and decreases the reversed flow volume for young and senior people, respectively. For middle-aged people, on the other hand, the reversed flow volume is increased and decreased in the middle of the sinus and near the bifurcation, respectively, for the carotid C1. For the carotid C2 with high flare and low curvature, on the other hand, it is found that exercising increases the reversed flow volume for all age groups. This work suggests that the effects of exercise on atherosclerosis should be evaluated by fully considering patient-specific geometries and ages

The body of christ in Chinese clothes: understanding the heritage significance of Hong Kong's Chinese-stylechurch architecture through St. Mary's Church in Tai Hang

published_or_final_versionConservationMasterMaster of Science in Conservatio

运动边界压力场重构方法、系统、设备及介质

本发明涉及了一种运动边界压力场重构方法、系统、设备及介质，一种运动边界压力场重构方法，包括：获取运动边界流场数据，所述运动边界流场数据包括速度场和运动边界；生成训练数据，所述训练数据包括速度监督数据、边界监督数据以及流动参数；根据预设参数构建双神经网络模型，所述双神经网络模型包括边界网络和流场网络；通过所述训练数据训练所述双神经网络；输入待预测点的空间坐标，训练后的所述双神经网络对应输出该点的压力值以预测运动边界条件下的压力场和边界。本发明得到准确的边界条件，减少运动边界下流场的压力重构误差

Wake of a bio-inspired flapping wing with morphing wingspan

This work uses a bio-inspired flapping wing model to numerically investigate the effect of morphing wingspan on wake structures. The model consists of a rectangular flat-plate wing heaving harmonically in a uniform incoming flow at the Reynolds number of 300 and Strouhal number of 0.3. The wingspan changes during heaving, with a maximum wingspan at the middle of downstroke and minimum wingspan at the middle of upstroke. The wake is characterized by two oblique chains of interconnected vortex loops. Although the morphing wingspan has little effect on the wake topology, it significantly affects the magnitude and size of the vortices near the wing surface, which leads to an asymmetric distribution of vortex loop chains in the wake. The shrinking of leading-edge vortex under the lower surface of the wing in downstroke and the destructive interaction of tip vortices in upstroke are identified as the two vortex dynamics corresponding to the asymmetric wake structures. The analysis on the lift coefficients shows that the above vortex interactions are mainly caused by the change of span length instead of spanwise velocity

基于机器学习的曲面动边界压力场重构

流场压力是流体动力学的基本物理量,直接影响了飞机、舰船等航行器的升阻力。同时,流场压力与流动结构相互作用,也是导致流动噪声和结构振动的重要因素。对于鱼类游动、心室舒张收缩、气泡变形这类曲面动边界问题,传统的基于PIV速度场的压力重构方法面临很大的挑战,亟需完善原有的重构方法和发展新的压力重构技术。我们提出了基于机器学习的曲面动边界压力场重构技术。该技术采用双网络模型,边界网络用于追踪边界的运动,流场网络用于流场的约束求解,两者通过边界条件耦合,从而实现曲面运动边界下的压力场求解。我们采用了振荡圆柱绕流、鱼类游动两种典型动边界流场对该方法进行了验证,前者压力场重构误差小于5%,后者误差在15%左右。我们将提出的方法应用于二维和三维左心室流场,得到了左心室中的压力场,进一步计算了左心室的受力