Effect of post-mortem temperature on beef tenderness

Beef adductor muscles were incubated for 4 h post mortem at 10°C and for 4 h and 6 h post mortem at 30°C, 37°C and 42°C. Half of the muscles were cooked just after incubation and the other half was first stored for two days at 4°C and then cooked. Meat kept for 4 h or 6 h at 42°C and for 6 h at 37°C and cooked at once had a significantly (p<0·05) lower shear force than meat kept for 4 h at 37°C, 4 h at 30°C, 6 h at 30°C or 4 h at 10°C. The respective significant differences were also found when the meat was cooked two days after incubation. Organoleptic evaluation showed that meat incubated for 6 h at 37°C or for 4 h at 42°C was not significantly more tender than other samples. However, meat kept for 6 h at 42°C was more tender (p<0·5) than the other samples. After two days of storage, meat incubated for 6 h at 37°C and for 6 h at 42° was more tender (p<0·05) than meat kept for 6 h at 30°C. It was concluded that high temperature conditioning at 37°C or higher for 6 h (4 h at 42°C) just after slaughter makes meat more tender than conventional cooling systems.     

Feature-based registration of retinal images

Registration of retinal images taken at different times frequently is required to measure changes caused by disease or to document retinal location of visual stimuli. Cross-correlation has been used previously for such registration, but it is computationally intensive. We have modified a faster algorithm, sequential similarity detection (SSD), to use only the portion of the template that contains retinal vessels. When compared to standard SSD and cross-correlation, this modification improves the reliability of detection for a variety of retinal imaging modalities. The improved reliability enables implementation of a two-stage registration strategy that further decreases the amount of computation and increases the speed of registration.     

激光相变硬化的温度控制

稳定吸收的功率密度是获得沿着扫描轨迹的均匀硬化层深及适当的硬度分布的先决条件。然而,激光输出功率及专门的或涂覆的表面的吸收实际上是波动的,从而导致沿着扫描轨迹的吸收功率通量的变化,甚至在准稳定处理条件下也是如此。可以通过适当的包括一台快速高温计及一台比例积分微分控制器(PID)的控制系统来克服这个困难。通过监视最大温度点上的表面温度场及激光输出功率的控制来保持恒定的吸收。     

FORMATION OF MANGANESE SILICIDE THIN FILMS BY SOLID PHASE REACTION

1. IntroductionThe transition metal silicides have attraeted much attention because of their potentialapplicatiOIl in very large scale integration (VLSI) de.ice[1]. Near-noble metal silicides canbe used as Schottky al1d ohn1ic col1tacts in silicon-based d…     

可作为制造超导磁体材料的钛-铌基合金的金属学问题和超导性

用直径1毫米的TiNb合金线,在约达100KG的磁场内,研究了晶内偏析、夹杂、锻造温度、变形速度、中间退火和时效对临界电流密度的影响。中间退火试验表明,当磁场为100KG时,在最高临界电流密度附近有一个最低的电压峰值,亦即形成较大磁通线束的磁通跃迁的趋势是不太大的。通过合金化,可以提高TiNb合金的硬度和弹性模量。较为精确地研究了添加铜和锗的问题,由此而析出了金属间化合物Ti_2Cu或Ti_5Ge_3。在这些金属间相析出为适宜的细晶粒的情况下,成功地改善了添加这两个元素的TiNb合金的电流运载能力。     

反向洗涤装置的计算

文中公式与图表有助于溶质回收率、洗液速率和洗涤段数的计算,从而使反向洗涤装置的设计最为经济合理。用适宜的溶剂以洗     

六六六生产中异构体分配的控制

六六六生产中异构体分配的控制采用下法实验: 实验方法实验使用两种仪器装置:用过量的苯作溶剂时,采用500毫升三口烧瓶,装有搅拌器、温度计、气体进口及取试料口。一或二个100瓦Mazda灯,125瓦Hanovia灯,或400瓦AH-1灯作光源。改变灯与反应器的距离,或在固定的距离下改变电压,以加强或减弱光的照度,进行试验。不含硫茂的苯(熔点5.5℃)200克放入烧瓶中,反应系统用氮充分洗涤。开灯,用水浴调节温度,由少量氮(0.05克分子/小时)稀释的氯通过流量计(0.2～0.4克/分     

卤代烷灭火剂的替代物研究

本文对1970～2000年世界卤代烷灭火剂 Halon1211、1301的生产、消费进行了统计和预测,介绍了卤代烷对环境影响的研究结果,筛选替代物的方法和部分有前途的替代物。