现代并条机的质量保障体系

20世纪80年代由于电子计算机技术、传感器技术及变频调速技术等一系列先进技术与并条机的有机结合，使新一代并条机的速度更高，并且其质量保障体系更加完善。如自调匀整装置、棉条粗节监控系统、牵伸罗拉隔距自动调节系统、高效负压清洁系统等，使棉条质量更高，为下游工序的优质高产创造了有利条件。     

环锭纺竹节纱捻度分析

对纱线粗细不匀造成成纱捻度分布不匀的原因进行了理论分析；通过对环锭纺竹节纱的捻度进行测试，分析了竹节长度、竹节间距和竹节倍数三个基本参数对竹节纱捻度的影响。结果表明，竹节倍数和竹节长度对竹节和基纱的捻度变化影响较大，竹节间距影响不大，可以通过增加竹节长度来减少竹节纱的捻度不匀；竹节纱追加捻度后，竹节处捻度增加较少，不能有效提高竹节纱强力，可以通过合理设计竹节纱规格参数来改善竹节纱强力。     

采用PLC与编码器作定位控制的技术研究

PLC与编码器应用是自动化生产线安装与调试的重点内容,也是我们面对工业设备非常有用的实际环节,借助生产线实训设备对用编码器定位控制进行研究与探索,重点完成编码器在皮带传动长度定位控制的设计,并拓展实际工程的两个应用实例的技术分析。     

Effect of freezing method and frozen storage duration on instrumental quality of lamb throughout display

This study evaluated the effect of freezing method (FM) (air blast freezer, freezing tunnel, or nitrogen chamber) and frozen storage duration (FSD) (1, 3, or 6 months) on the instrumental measurements of quality of thawed lamb, aged for a total of 72 h, throughout a 10-d display period, compared to the quality of fresh meat. pH, colour, lipid oxidation, thawing, and cooking losses in Longissimus thoracis and lumborum muscle, were determined following standard methods. FM affected yellowness, FSD redness and thawing losses, and both affected oxidation (increased as freezing rate decreased and/or as storage duration increased). When compared with fresh meat, the main differences appeared on oxidation (where a significant interaction between treatment (3FM × 3FSD + fresh meat) with display duration was detected), and on total losses (thaw + cook losses). Oxidation was lower in fresh meat, but values were not significantly different from those stored frozen for 1 month. Fresh meat had smaller total losses than did thawed meat, but losses were not significantly different from meat frozen in the freezing tunnel and stored frozen for 1 month. Display duration had a greater effect on instrumental quality parameters than did FM or FSD. pH, b*, and oxidation increased, and L* and a* decreased with an increase in the number of days on display. In conclusion, neither freezing method nor frozen storage up to 6 months influenced extensively the properties of lamb when instrumental measurements of quality were measured in meat that had been displayed for 1 d after thawing. The small deterioration shown in this study should not give consumers concerns about frozen meat.     

CJ40型棉精梳机的性能及应用

为了解CJ40型棉精梳机的性能特点,分析了CJ40型棉精梳机的主要技术特征并进行了纺纱实践.经检验,所纺精梳条质量达到Uster公报25%水平,CJ40型棉精梳机有效输出长度缩短、分离罗拉输出棉网接合长度增加,有效地提高了精梳条质量.     

一种棉纤维短绒率测试装置的研究

探讨一种棉纤维短绒率的测试方法.分析了棉纤维短绒率的传统测试方法及其测试原理,介绍了一种快速测试棉纤维短绒率的方法,通过对其关键技术的保证,以及不同校准条件下机器测试的两种结果与国家标准值、手扯检测结果的相关性分析,试验证明:该装置在两种校准状态下所测试结果的相关性很强,但用不同的校准方法(校准值不同)校准后,测试数据有一定差异.认为:该方法只需用国家标准棉样标准值校准机器后,就可以快速、准确地测试棉纤维短绒率.     

Kinematics of running on 'off-road' terrain

It has been established that running on natural 'off-road' terrain elicits a higher energy demand than running on road. Running on such terrain may also result in changes to the characteristics of the normal running stride. The aim of this study was to investigate biomechanical alterations to stride characteristics during offroad running. Nine female participants were recorded on video while running over three terrain types: surfaced footpath, short grass and long grass. The videos were digitized in order to quantify temporal, displacement and velocity variables. Cycle time was not significantly different between conditions (p = 0.315). Step length decreased (p < 0.01) and both vertical displacement of the hip and knee lift increased significantly (p < 0.01) with increasing difficulty of terrain. Despite assisted pacing, there was a significant decrease in velocity (p < 0.01) with each progressively rougher terrain condition. The peak extension angular velocity of the knee was not affected significantly (p = 0.098) by the terrain despite the fact that there was a significant difference in the peak flexion angular velocity (p < 0.01). It was concluded that participants altered their stride displacement and velocity patterns significantly in response to changes in running surface.