FULL UNIAXIAL COMPRESSION CURVES FOR PREDICTING SENSORY TEXTURE QUALITY OF COOKED POTATOES

The prediction of six different sensory texture attributes of twenty-seven potato samples based on uniaxial compression curve features and full uniaxial compressions curves is reported. The data set comprised five varieties, sorted in dry matter bins, and sampled at two storage times. The predictions of most of the sensory texture attributes from full compression curves performed better than just using curve features. Furthermore, force-deformation curves are shown to give slightly better predictions than stress-strain curves. For most of the texture attributes better predictions were obtained using uniaxial compression data from raw potato samples as compared to cooked samples. This study is meant to open up a debate on interpreting the information in uniaxial compression curves in relation to sensory texture quality. Multivariate analysis can handle this and can further give insight about where in the curve the information relevant for the predictions of the sensory attributes is found.     

分布式实时数据库系统中一种新的复制控制策略

为了更好地满足实时分布式数据库系统的实时性和一致性这两个基本要求 ,本文介绍了一种新的集成了实时任务调度和复制控制的复制控制算法 .     

CSP生产线轧制力模型的研究及优化

分析了涟钢CSP生产线7机架精连轧机的板带轧制力模型，并针对其在实际生产过程中遇到的一些问题，提出了改进方案，即基于原轧制力模型进行优化，建立了新模型．同时确立了新的变形抗力模型方程．由优化前后的计算和对比分析可知，新模型的精度更好。在生产实际应用中对轧制力的预报准确率大幅度提高。     

热处理对特殊黄铜微观组织及耐磨性的影响

论述了热处理工艺对特殊黄铜微观组织及耐磨性的影响，试验证实：加Ce处理的特殊黄铜，800℃淬火250℃以上温度回火，将会有a相的出现，由于a相在磨损过程中能够松弛应力，减轻应力集中，使磨损颗粒不易形成，从而导致材料的耐磨性也有差异，随着温度的不同，将会有不同形态的网状相析出，350℃时得到的网状a相结构分支形态最复杂，对材料的耐磨性最有利，剥层理论可以给这种现象很好的解释。     

Temperature Sensitivity and Pressure Resistance of Mushroom Polyphenoloxidase

Measurements of residual enzyme activity and FTIR-spectroscopy revealed that mushroom polyphenoloxidase is a thermosensitive enzyme readily inactivated by temperatures exceeding 50°C. The enzyme is, however, very pressure stable. At room temperature no enzyme inactivation occurred at pressures up to 6 kbar. FTIR-spectroscopy revealed that a modification in enzyme conformation occurred below 9 kbar. Kinetic studies showed that pressure and temperature did not always act synergistically with respect to enzyme inactivation. FTIR-spectroscopy showed that pressure- or temperature-induced changes were considerably different. Both temperature and pressure-temperature inactivation were only slightly influenced by pH (in the pH-range 5.5–7.5).     

低钴AB_5型贮氢合金的制备及电化学性能

为了降低镍氢电池的原材料成本 ,研究了一系列多元、低钴和无钴AB5型贮氢合金 ,以及取代元素对贮氢合金电化学性质的影响。结果显示 ,用少量的铁、铜和铬部分取代贮氢合金La(NiMnCoAl) 5中的钴对改善贮氢合金电化学循环稳定性有效。贮氢合金La(NiMnAl) 4.6(FeCuCr) 0 .2 Co0 .2 具有满意的循环稳定性 ,它在 0 .2C放电条件下的最大放电容量为 2 96mAh/g-1,经过 30 0次循环容量衰减仅 2 1.8%。另外 ,还用X射线衍射检测了贮氢合金的微观结构     

逆变式电阻焊机的研究进展

介绍了逆变电阻点焊机的特点,国内外逆变点焊机的研究现状,提出了逆变点焊电源研制过程中存在的几个问题。     

湿法炼锌中碳酸锶进料设备的选型优化

介绍了株冶集团锌电解厂湿法炼锌中碳酸锶的进料方式存在的一系列问题及各种原因,针对问题原因进行了一系列设备选型、改型优化等工作,比较了螺旋给料机和圆盘给料机使用后的情况,给出了圆盘料机的送料效率和送料量的计算方法,并分析了影响送料精度的因素及解决措施。     

ZMQ型气动薄膜切断阀异常工况原因分析

叙述了ZMQ型气动薄膜切断阀的结构、工作原理及运行中的异常现象 ,认为该型阀门的冲撞和振动是由阀芯上、下端面存在的较大压差所引起     

气候变化对甘肃黄土高原土壤贮水量的影响

利用甘肃省黄土高原16个气象站1971~2000年气象资料、13个农业气象观测站及3个农业气象试验站土壤湿度资料,分析了近50年温度、降水及近30年土壤水分变化特征,用数理统计方法拟合了0~200 cm土壤贮水量动态变化,得出了土壤贮水量随气候变化的规律。研究表明,上世纪80年代以来,甘肃黄土高原土壤含水呈减少之势,0~200 cm土层土壤总贮水量春、秋季减少了40~90mm,夏季减少了20~36mm;土壤贮水适宜农作物生长的时段减少了2~3月,土壤水分匮缺的范围无论从时段及层次上都有所扩展。