Alteration of post-mortem ageing in beef by the addition of enzyme inhibitors and activators

Twenty-four hours after stunning, slices of beef M. semitendinosus were soaked in buffers at 10 °C at different pH values containing enzyme inhibitors or calcium and magnesium salts and their enzyme levels and toughness determined up to 9 days. High pH meat was tender but appeared to have the same rate of ageing as meat of normal pH. Calcium chloride accelerated ageing and produced, after completion of conditioning, more tender meat than controls. In tenderising, sodium and potassium chlorides were 43% and MgCl(2) 73% as effective as Ca salts. Cysteine proteinase inhibitors were more effective in preventing ageing than serine or aspartate inhibitors. Cysteine and aspartate inhibitors together were the most effective in preventing ageing. The inhibition of ageing by cysteine inhibitors was overcome in the presence of 30 mM CaCl(2). The results suggest a main, but not exclusive, role for calpains in meat ageing and showed a synergistic non-enzymic tenderisation by the addition of high concentrations of salts.     

Elimination of threshold-induced distortion in the power spectrum of narrow-band laser speckle

The distortion in the power spectrum of narrow-band laser speckle that results from irradiance thresholding is quantified. A method for compensation of this distortion is presented. An optimal threshold level is presented that simplifies the compensation method.     

无砂浆灌孔砌块砌体的基本力学性能试验

研究无砂浆灌孔砌块砌体的基本力学性能,通过对3种灌孔混凝土强度的27个(抗压9个、抗剪18个)无砂浆灌孔砌块砌体进行静力加载试验,观察试件裂缝的发展、试件的破坏情况,并记录相应的荷载值.发现无砂浆灌孔砌块砌体的抗压性能和抗剪性能与普通混凝土空心砌块砌体的基本相似.与《砌体结构设计规范》(GB50003-2011)平均值公式计算值相比,无砂浆灌孔砌块砌体的抗压和抗剪强度分别提高了52%~78%和8%~14%.抗压试验的初裂荷载为破坏荷载的55%~60%,抗剪试验的初裂荷载约为破坏荷载的80%.试验结果与建议的理论公式的计算值较为接近.     

Parameter identification and sedative sensitivity analysis of an agitation-sedation model

Sedation administration and agitation management are fundamental activities in any intensive care unit. A lack of objective measures of agitation and sedation, as well as poor understanding of the underlying dynamics, contribute to inefficient outcomes and expensive healthcare. Recent models of agitation-sedation dynamics have enhanced understanding of the underlying dynamics and enable development of advanced protocols for semi-automated sedation administration. In this research, the agitation-sedation model parameters are identified using an integral-based fitting method developed in this work. Parameter variance is then analysed over 37 intensive care unit patients. The parameter identification method is shown to be effective and computationally inexpensive, making it suited to real-time clinical control applications. Sedative sensitivity, an important model parameter, is found to be both patient-specific and time-varying. However, while the variation between patients is observed to be as large as a factor 10, the observed variation in time is smaller, and varies slowly over a period of days rather than hours. The high fitted model performance across all patients show that the agitation-sedation model presented captures the fundamental dynamics of the agitation-sedation system. Overall, these results provide additional insight into the system and clinical dynamics of sedation management.     

3D视频后处理方法的评估及改进

利用2D视频滤波方法处理3D视频时会影响“景深”的表现效果。针对该问题,通过计算视频的块效应程度和深度损失率,并结合主观评分,对视频质量进行评估,在评估结果的基础上,根据3D视频的景深信息对传统后处理方法进行改进。实验结果表明,改进方法能够带给观众更真实的3D体验。     

基于改进Kalman滤波的智慧社区居民定位

现如今智慧社区正在快速发展, 各种公共设施及建筑的建设使得社区内环境复杂, 影响着居民中弱势群体的安全. 故实时的居民定位便格外重要. 智慧定位作为精准化智慧服务之一, 主要通过RFID技术实现社区内老幼等人群的轨迹跟踪, 以进行安全保障. 除此之外还可分析居民聚集场所趋势, 为社区建设公共设施提出建议. 本文针对RFID阅读器传播数据时被各种噪声影响导致的定位精度差、定位结果偏差等传统问题, 引用了Kalman滤波消除信号传递过程中的过程噪声和观测噪声, 在该算法中插入改进的密度聚类算法以消除环境噪声影响, 设计了基于改进密度聚类算法的Kalman滤波轨迹定位方法(Kalman filter for improved density peak clustering, K-IDPC). 经实验验证, 相对于Kalman滤波, K-IDPC的定位精度在0.565 m左右, 准确度大幅提高.