挤出机螺槽内物料温度分布的试验研究

将热电偶置入销钉挤出机的改造后的销钉内，从而测量了挤出机螺槽内物料的温度分布。由所得实验结果讨论了物料温度变化的原因及其影响因素，并对实验误差进行了详细分析，最后就实验方法和温度测量方法给出改进措施

在旋转磁场中海森伯自旋链的几何相位

用代数动力学方法,研究旋转磁场中海森伯自旋链的几何相位.选用一个有部分各向异性海森伯耦合的3自旋12粒子环链系统.发现系统的哈密顿量具有su(2)代数结构.通过选择一个最佳规范变换,运用代数动力学方法得到系统的精确解.计算了系统的非绝热和绝热几何相位.把部分各向异性海森伯耦合推广到一般情况下的海森伯耦合,发现:在绝热近似下,海森伯耦合强度不影响系统的几何相位

克氏原螯虾壳虾青素提取条件的优化

以新鲜克氏原螯虾壳为原料,比较了冷冻干燥、常温风干和烘干3种前处理方式对克氏原螯虾壳虾青素的提取效果。采用单因素试验研究了提取溶剂、料液比例、浸提温度、浸提时间、提取次数对虾青素提取效果的影响,用紫外分光光度法测定虾青素的含量。结果表明,丙酮的萃取效果优于无水乙醇和石油醚,风干和烘干处理的虾壳虾青素提取量显著低于冷冻干燥处理,最佳提取条件为：料液比1∶20（g∶mL）、温度30℃、时间2 h、重复提取2次。最佳提取条件下2次提取的加标回收率为99.2%,新鲜虾壳虾青素平均提取量为148.2μg/g

两种绿藻辅助饲喂对克氏原螯虾生理活性的影响

以克氏原螯虾为研究对象,测定了在正常投喂人工颗粒饲料的基础上辅助添加小球藻、刚毛藻饲喂克氏原螯虾的生理活性。结果表明:试验期间添加小球藻(1.0×10^6—1.0×10^7 cells·L^-1)、刚毛藻(0.06—0.08 g·L^-1)对克氏原螯虾的生长与存活率均无显著影响(P>0.05),但肌肉超氧化物歧化酶(SOD)和肝胰脏酸性磷酸酶(ACP)的活性显著降低(P<0.05);机体的血细胞密度显著增加(P<0.05),外骨骼和肌肉中虾青素的含量极显著增加(P<0.01);单独添加刚毛藻肌肉虾青素含量也显著提高(P<0.05),血清、肝胰脏和肌肉碱性磷酸酶(AKP)的活性极显著提高(P<0.01),肝胰脏酸性磷酸酶的活性极显著降低(P<0.01)。摄食小球藻和刚毛藻对于克氏原螯虾的抗逆活性和免疫能力具有促进作用,养殖水体中适度添加小球藻和刚毛藻有助于克氏原螯虾的健康与活力

Bioinspired Musculoskeletal Model-based Soft Wrist Exoskeleton for Stroke Rehabilitation

Exoskeleton robots have demonstrated the potential to rehabilitate stroke dyskinesia. Unfortunately, poor human-machine physiological coupling causes unexpected damage to human of muscles and joints. Moreover, inferior humanoid kinematics control would restrict human natural kinematics. Failing to deal with these problems results in bottlenecks and hinders its application. In this paper, the simplified muscle model and muscle-liked kinematics model were proposed, based on which a soft wrist exoskeleton was established to realize natural human interaction. Firstly, we simplified the redundant muscular system related to the wrist joint from ten muscles to four, so as to realize the human-robot physiological coupling. Then, according to the above human-like musculoskeletal model, the humanoid distributed kinematics control was established to achieve the two DOFs coupling kinematics of the wrist. The results show that the wearer of an exoskeleton could reduce muscle activation and joint force by 43.3% and 35.6%, respectively. Additionally, the humanoid motion trajectories similarity of the robot reached 91.5%. Stroke patients could recover 90.3% of natural motion ability to satisfy for most daily activities. This work provides a fundamental understanding on human-machine physiological coupling and humanoid kinematics control of the exoskeleton robots for reducing the post-stroke complications.</p