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强制运动对种公牛精液品质的影响 被引量:1
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作者 张宝良 苏文娟 +2 位作者 马玉婷 陈红 马强 《中国牛业科学》 2020年第4期35-36,共2页
[目地]通过对种公牛强制运动观察精液理化指标的变化以及冻后指标的影响。[方法]选择无疾病正常采精种公牛4头,记录分析强制运动后20 d,40 d,60 d,80 d精液冷冻前后理化指标变化。[结果]种公牛强制运动后原精液密度增加2.98亿,精液活力... [目地]通过对种公牛强制运动观察精液理化指标的变化以及冻后指标的影响。[方法]选择无疾病正常采精种公牛4头,记录分析强制运动后20 d,40 d,60 d,80 d精液冷冻前后理化指标变化。[结果]种公牛强制运动后原精液密度增加2.98亿,精液活力提高0.17%,精液量增加0.6 mL,冻后废弃率降低21%,冻后活力提高0.08%,差异极显著(P<0.05)。[结论]种公牛强制运动再结合刷拭等保健措施能有效改善精液品质,增加生产数量,提供更多优秀遗传物质。 展开更多
关键词 强制运动 种公牛 精液品质 理化指标 刷试
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澳洲矮脚牛的饲养管理
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作者 赵小娟 《农技服务》 2004年第8期35-36,共2页
关键词 澳洲矮脚牛 饲养管理 饲料 清洁 饮水 运动 刷试 防疫
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Friction and wear of textured surfaces produced by 3D printing 被引量:3
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作者 HONG Yi ZHANG Peng +1 位作者 LEE Kwang-Hee LEE Chul-Hee 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第9期1400-1406,共7页
Surface texture patterns have great potential for improving tribological performance in terms of reducing friction and wear. The most common methods for surface texatring are laser and injection molding. The 3D printi... Surface texture patterns have great potential for improving tribological performance in terms of reducing friction and wear. The most common methods for surface texatring are laser and injection molding. The 3D printing method is also used to build parts, patterns, and molds that feature fine details for a wide range of applications because texture manufacturing by 3D printing is faster, more flexible, and less expensive than traditional techniques. To date, there has been no research on textured surfaces produced by 3D printing. Therefore, a new fabrication method using 3D printing to improve friction and wear properties is a topic worth exploring. In this study, a reciprocating friction tester was used to evaluate the friction and wear properties of different surface textures produced by 3D printing. The surface of specimens was examined by electron microscope and scanning electron microscope before and after the test. The results show that surface texturing can be applied to 3D printed parts to improve their friction and wear performance. 展开更多
关键词 three-dimensional (3D) printing TEXTURE FRICTION WEAR
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