G1736型剑杆织机生产实践

探讨G1736型剑杆织机的工艺性能优化。以织色织布为例,分析了该织机开口动程和开口时间、后梁高度和停经架位置等工艺参数的调整和优化措施。阐述了提高织机效率、降低织疵的有效方法。通过优化织机上机工艺参数和采取相关技术措施,发挥设备应有的性能。织造平均机效率达到91.6%。     

生猪宰前静养损耗与猪肉品质研究

本文主要对辽宁北部地区生猪在静养24小时(h)过程中,毛重损耗、出肉率、猪肉系水力和猪肉品质进行研究。结果表明:生猪静养24h过程中,代谢率呈现两个相对稳定期,分别是8-16h和20-24h。8-16h毛重损耗处于相对稳定期,16-20h毛重损耗呈显著上升状态,20h后损耗又开始趋于稳定;随着静养时间的延长出肉率呈现下降趋势,但差异不显著(P>0.05);静养24h滴水损失比静养12h低1.67%差异显著(P<0.05),静养24h滴水损失比静养0h滴水损失低4.29%差异显著(P<0.01),静养24h猪肉的系水力明显高于静养0、6h组,差异显著(P<0.01);PSE肉比例随静养时间延长逐渐降低差异显著(P<0.05),DFD肉比例随静养时间延长逐渐升高,差异不显著(P>0.05)。     

熟化对面条产品质量影响的研究

旨在研究面团熟化的最佳工艺条件.采用正交实验法对熟化工艺进行研究.面团熟化的最佳工艺条件为熟化湿度80%～85%,熟化时间 60 min,熟化温度 35 ℃.熟化湿度为最主要的影响因素;熟化时间为次要的影响因素.此研究为制面行业根据产品要求制订工艺及选择参数提供了理论上的依据.     

Impact of the implementation of rest days in live bird markets on the dynamics of H5N1 highly pathogenic avian influenza

Live bird markets (LBMs) act as a network ‘hub’ and potential reservoir of infection for domestic poultry. They may therefore be responsible for sustaining H5N1 highly pathogenic avian influenza (HPAI) virus circulation within the poultry sector, and thus a suitable target for implementing control strategies. We developed a stochastic transmission model to understand how market functioning impacts on the transmission dynamics. We then investigated the potential for rest days—periods during which markets are emptied and disinfected—to modulate the dynamics of H5N1 HPAI within the poultry sector using a stochastic meta-population model. Our results suggest that under plausible parameter scenarios, HPAI H5N1 could be sustained silently within LBMs with the time spent by poultry in markets and the frequency of introduction of new susceptible birds'' dominant factors determining sustained silent spread. Compared with interventions applied in farms (i.e. stamping out, vaccination), our model shows that frequent rest days are an effective means to reduce HPAI transmission. Furthermore, our model predicts that full market closure would be only slightly more effective than rest days to reduce transmission. Strategies applied within markets could thus help to control transmission of the disease.     

EFFECTS OF AIR REST PERIODS ON MALTING SORGHUM RESPONSE TO FINAL WARM WATER STEEP

The effects off various lengths of air rests on response off malting sorghum main root length, malting loss, diastatic activity, α- and β-amyloytic activity and extract to final warm water steep at 40°C was investigated. Grains were steeped in distilled water for a total of 48 h at 30°C with a 6 h final warm water steep under four different cycles incorporating 1, 2, 3 or 4 h air rest periods. All malt quality properties evaluated were significantly affected by the length of air rest, the cultivar and their pair-wise interactions. Main rootlet length and malting loss reduced progressively as the length of air rest increased. Reducing power, α- and β-amylolytic activity and extract generally increased as the length of air rest was increased for both sorghum cultivars ICSV 400 and KSV 8 examined. The steep cycle incorporating 3 h length of air rest was found by experiment to give the optimum levels of malt quality indices analysed while at the same time causing considerable reduction in average main rootlet length and total malting loss for both grain cultivars.     

散体泥沙的水下休止角

从散体泥沙堆积的实际物理过程出发建立了相应的力学平衡方程式，获得了水下散体泥沙休止角计算公式，用实测资料对公式进行了验证，得到了较满意的结果．     

Workers’ rest allowance and smoothing of the workload in assembly lines

Ergonomic aspects have a crucial role in manual assembly systems. They impact on the workers’ health, final product quality and productivity. For these reasons, there is the necessity to integrate them into the assembly line balancing phase as, whereas, only time and cost variables are considered. In this study, human energy expenditures are considered as ergonomic aspects and we integrate them, for the first time, into the assembly line balancing problem type 2 through the rest allowance evaluation. We consider as an objective function the minimization of the smoothness index. Firstly, a new optimal method based on mixed integer linear programming and a new linearization methodology are proposed. Then, a heuristic approach is introduced. To complete the study, a computational experimentation is presented to validate the mathematical model and to compare the methodologies proposed in terms of computational time, complexity and solution. Additionally, we provide a detailed analysis of the impact that rest allowance evaluation can have on productivity comparing the results obtained, taking into account the rest allowance integration before, during and after the assembly balancing process.     

具有调光功能的高功率因数单级电子镇流器

提出一种高功率因数电子镇流器,利用复合开关原理,将前级AC/DC变换器中反激变换器的主开关与后级DC/AC半桥变换器中的一个开关合并,将双级电路变为单级电路。本电路采用变频变占空比控制,通过选择变压器匝比和控制占空比,使变压器的励磁电感工作于继续方式。利用电压跟踪控制,实现功率因数校正。通过调整开关频率,实现可调光功能。     

塑料内衬模板的应用

分析了各种模板体系的特点及应用范围，阐述了塑料复合内衬模板的设计构想，论述了其组成以及施工工艺，总结了应用中的有关注意事项，达到提高结构整体耐久性的目的。     

Reliability of different thresholds for defining muscular rest of the trapezius muscles in computer office workers

This study aimed at documenting the reliability of different thresholds used for defining the muscular rest of the trapezius muscles of 27 computer office workers, using surface electromyography (EMG) signals collected in the field. Measurement strategies for increasing the reliability of the results were also explored. Ten different thresholds to define muscular rest were compared: 1) five normalised (individualised) thresholds; 2) three absolute thresholds (in μV); 3) two absolute but individualised thresholds. The reliability was assessed using both a 15-min standardised computer task and 45 min of regular computer work. The main findings were: 1) overall, in a repeated measures study design, muscular rest variables were more reliable with the use of absolute thresholds when compared to normalised and individualised thresholds; 2) excellent reliability (index of dependability >0.75) can be reached when averaging the scores over 2 days; 3) using a standardised task instead of regular work does not necessarily lead to more reliable results.