Eating quality of commercially processed hot boned sheep meat

The aim of this work was to establish consumer perceptions of the eating quality of commercially processed hot boned sheep meat. The eating quality scores for tenderness, flavour, juiciness, and overall liking of grilled m. longissimus thoracis et lumborum (LL) were derived from untrained consumers. The animals used in this experiment were sourced from three different properties and were of various ages, breed, and sex, and had been on various quality pastures. All carcases were subjected to immobilisation, spinal discharge and high voltage electrical stimulation and boned within 2 h of slaughter. All LL samples were frozen after boning according to the system applied at the abattoir and samples kept for consumer assessment and measurement of meat quality. The results showed, on average carcases entered rigor at high temperatures with a pH of 5.95 at 29.3 °C. With an average sarcomere length of 1.68 μm, some shortening was evident and there was a significant difference between lots in sarcomere length (P < 0.05). A large percentage (82%) of samples had a pH greater than 5.8 at the time of freezing. All samples taken for shear force analysis exceeded a recommended threshold for acceptable table meat of 49 N and there was no significant difference between lots (P > 0.05). Only 13.5% of the samples met the ‘good everyday’ requirement following sensory assessment and there were significant differences between lots for eating quality traits (P < 0.05). This work clearly shows that the application of effective electrical stimulation is not sufficient to ensure that hot boned sheep meat will be suitable as a table meat. These findings highlight the need for the inclusion of other intervention techniques.     

不同粉体粒度对二硅酸锂玻璃陶瓷热压铸前后微观结构和性能的影响

分析了不同粒度对Li2O-SiO2-K2O-Al2O3-ZrO2-P2O5系新型齿科二硅酸锂玻璃陶瓷在热压铸前后微观结构和性能的影响。分别用差热分析(DTA)、扫描电镜(SEM)和X射线衍射(XRD)分析了玻璃陶瓷的晶化温度、微观结构和物相组成。根据ISO6872标准测试材料的弯曲强度。结果显示,不同粉体粒度的玻璃陶瓷间微观形貌有明显差异;不同的粉体粒度和热压铸工艺对玻璃陶瓷的晶相组成无显著影响;不同粉体粒度的玻璃陶瓷在热压铸前后强度均有差异,热压铸后,各组弯曲强度显著提高,但是粒度的变化和强度之间无明确的相关性。结果表明,不同粒度对实验玻璃陶瓷的晶化行为和性能都有显著影响。     

气瓶多道次热旋压收口成形工艺的数值模拟研究

本文基于MSC.Marc有限元软件,对首道次从夹具端起旋,随后道次起旋点沿管轴向逐渐远离夹具端的旋压收口工艺路线进行了数值模拟研究。数值分析表明,所建立的旋压模型符合旋压收口工艺的金属塑性变形规律。旋压温度在1,200℃,管口出现局部变形失稳。壁厚在管端部增厚,在过渡圆角处减薄,且随着旋压温度的升高,管端的增厚和圆角的减薄都增大。最大等效应力应变分布在靠近收口管端的圆周外表面处,且随着旋压温度的增加都相应减小。     

几种热阴极电离真空计电参数校准及分析

通过真空比对标准装置及电参数测量系统,对目前较为常用的ZJ-27,ZJ-12,ZJ-10,ZJ-2等四种热阴极电离真空计进行电参数校准。通过对实验数据的分析,验证了该套装置及方法校准热阴极电离真空计电参数的可行性。     

某热气融霜管路供液过滤器爆裂事故分析的试验研究

介绍了一种新型的利用制冷系统中的压缩机高温排气对商用冷冻冷藏设备进行除霜的热气融霜系统。同时针对某热气融霜工程供液过滤器爆裂事故进行了分析和试验研究,试验数据重复性良好,进一步验证了系统的可靠性;研究结果还表明：热气融霜系统中大量阀件的正确安装顺序对于整个系统的安全、高效运行具有至关重要的作用。     

2012年我国钢管消费预测及热点话题

对2012年我国各个行业的钢管消费情况进行了分析预测,介绍了我国钢管行业特别是焊管行业发展的热点话题。指出:2012年我国钢管市场的发展态势可归结为"需求增速放缓,价格震荡波动,微利仍将延续";市场运行特点是"前低后高"。     

某型锅炉风帽锥体压制工艺改进

本文针对CPC75 t/h循环流化床锅炉中风帽锥体化压制工艺,将原来的分瓣压制改进为整体压制工艺,解决了分瓣压制工艺存在的问题,为CPC的循环流化床锅炉的先进技术在我国的推广打下的良好基础。     

2250mm热连轧机粗精机组能力匹配研究

对国内新建2250mm热连轧机的粗轧机组配置型式及特点进行了阐述,以国内某大型钢铁厂2250mm热连轧机组的产品大纲为背景,以追求粗精机组能力匹配合理、避免过多富余能力为原则,从设计角度对粗轧机组采用主流配置型式条件下的粗精轧机组能力匹配问题进行了计算分析,其结果表明在达到经济规模的前提下,采用第三种配置型式粗精轧机组的能力更为合理,同时弄清了高强钢生产比例对机组负荷率影响。此结论对新一代钢铁厂同规格热连轧机组的设计具有借鉴、指导意义。     

粉末压片X射线荧光光谱法测定球团矿中各主次成分

采用粉末压片X射线荧光光谱法测定球团矿中的各主次成分,结合本公司的实际生产工艺和要求,通过优化制样过程中的各项参数,确定最佳的制样条件,选用具有一定梯度含量的自产球团矿样品用化学分析进行定值,而后绘制工作曲线对生产样品进行分析。经实际使用表明,本法测量准确度、精密度较好,所得分析结果与化学分析结果一致。     

热等静压(HIP)技术和设备的发展及应用

从热等静压设备的组成部分及安全保护设计方面简要介绍国外该设备的发展,并介绍国外热等静压设备的特点。在国内热等静压设备的发展方面,简要介绍研发和为国内外用户制造热等静压设备并成功投入使用的情况。在热等静压技术应用方面,主要介绍该技术在铸件致密化处理、粉末冶金、热等静压连接和复合以及在重要工程项目中的实际应用。