共查询到16条相似文献,搜索用时 74 毫秒
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根据WHO制定的、各成员国政府已签署的《烟草控制框架公约》对烟草制品成分进行限制。对市售卷烟的焦油、烟碱含量及CO释放量做出了具体的限量限制。目前国内烟草业正在通过多种手段对合理降低卷烟焦油含量及CO释放量的有效途径进行探索。从经济角度和可操作性来讲,通过对卷烟机加装在线打孔装置对在产烟支进行在线打孔的方式来降焦降害的方式值得推广。本文主要是通过卷烟通风度对烟气特征影响的实验的基础上,对所得的实验数据进行统计技术分析,建立了卷烟打孔个数、打孔时间、通风度、焦油、烟碱和CO释放量的预测模型,利用线性回归分析,求得相关性数学模型,预测模型可以在生产及产品开发的过程中起到一定的指导作用。 相似文献
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铝合金是工艺生产中一种重要的轻金属材料,相对于铝合金的传统焊接工艺,激光焊接工艺具有很多优点,激光是一种高能量的密度热源,能够快速的焊接并且具有较小的热输入,使焊接的变形小,生产质量较高,本研究对铝合金的特性进行了分析,并阐述了铝合金激光焊接技术的发展现状和工艺特性,再探讨了激光焊接技术的应用领域。 相似文献
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杜泊绵羊羔羊生长发育规律的研究 总被引:14,自引:2,他引:14
杜泊羔羊体形外貌一致 ,黑头白身躯 ,肉用体型典型。初生重 :公羔 5 3kg± 0 8kg ,母羔 4 5kg± 0 9kg ;3月龄体重 :公羔 3 7 9kg± 5 3kg ,母羔 3 3 3kg± 4 4kg ;0~ 3月龄平均日增重 3 5 1g± 71g ,其中公羔 3 85g± 74g ,母羔 3 3 3g± 64g。饲料利用率高 ,哺乳期只均日耗颗粒饲料 (含 2 4%花生秧粉 ) 5 2 1g ,料重比为 1 8∶1(母乳除外 ) ;抗寒耐热 ,抗病力强 ,适应性好 ,易管理 相似文献
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REASONS FOR PERFORMING STUDY: Anecdotal reports suggest that laser-facilitated arthrodesis of the distal tarsal joints improves the prognosis compared with intra-articular drilling but no objective comparisons have been performed. OBJECTIVES: To evaluate intra-articular drilling and laser-facilitated arthrodesis using in situ and in vivo techniques. METHODS: Fourteen cadaver limbs were evaluated in situ for chondrocyte viability after both surgical techniques. In vivo, one randomly selected limb was subjected to laser-facilitated arthrodesis and the other underwent intra-articular drilling in 6 normal horses. Clinical examinations were performed at 1, 3 and 5 months. Two horses were subjected to euthanasia at 1, 3 and 5 months. RESULTS: Significantly more chondrocyte death was observed with laser-facilitated arthrodesis compared to drilling, but the overall degree suggested only a focal effect. In vivo, both groups demonstrated minimal post operative morbidity. There was more evidence of arthrodesis seen at all time points with intra-articular drilling. CONCLUSIONS: This study demonstrated that changes associated with ultimate arthrodesis occur earlier after intra-articular drilling of the distal tarsal joints than laser-facilitated arthrodesis, although clinically affected horses may respond differently. POTENTIAL RELEVANCE: Intra-articular drilling may provide earlier arthrodesis of the distal tarsal joints, but not necessarily a better long-term result. 相似文献
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随着我国畜牧业的快速发展,饲料级磷酸氢钙作为一种优良的家禽、家畜饲料添加剂,其需求量和安全性要求日益提高.文章对国内外饲料级磷酸氢钙生产工艺的研究进展做了较为系统的阐述. 相似文献
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要提高种蛋的孵化率、健雏率,除满足孵化所必需的条件外,如何搞好人员的管理、调动其主动性和积极性并使工作有章可依也是至关重要的。以下是笔者通过几年的工作实践制定的一套比较完善的管理细则,以助管理制度化。1接蛋接蛋人员要爱护种蛋,轻拿轻放。严格剔除破蛋、脏蛋、畸形蛋,蛋箱垫草要适宜。运输过程中,蛋车要平稳,上下蛋要轻抬轻放,接蛋后地面要清刷干净,接蛋车的消毒工作由上半夜值班人员负责。2熏蛋种蛋入熏蒸室后,要及时熏蒸。药品称量由值班人员负责,要求剂量准确,消毒确实,并做好记录。3入库熏蒸20分钟后排风… 相似文献