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光纤接续是光缆施工中工程量大和技术要求高且复杂的一道工序,其质量好坏直接影响线路的传输质量和使用寿命。努力降低光纤接头处的熔接损耗,就可增加光的传输距离、提 相似文献
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光纤传感器在油气管道中的应用,主要是监测管道的温度和压力变化,同时还要监测油气流量情况,系统控制中心根据这些量的变化判断具体情况或实施相应的操作,具有预警功能.本文对光纤传感器在输油气管道中的应用进行了探讨. 相似文献
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干酒糟及其可溶物(DDGS)是用玉米生产酒精的过程中产生的副产物,其营养的分析值大约是玉米分析值的3倍。纤维是残留在DDGS中众多养分的一种。日粮纤维是日粮中碳水化合物和木质素的总和,而木质素在哺乳动物的小肠中不能消化,但在肠道后端中可以被部分或全部分解。 相似文献
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In this study,321 samples were tested to evaluate the correlation between fineness and single fiber strength of alpaca fiber. The results showed that fineness average of lateral part was 24.30 μm,subject range was from 18.01 to 27.00 μm,accounted for 72% of the total samples;The strength average was 8.31 cN,subject range was from 5.01 to 11.00 cN, accounted for 88% of the total samples, it showed that the overall fineness of alpaca wool fiber was fine,the strength could satisfy the textile technology. The correlation results showed that the fineness of different parts (neck, shoulder, thigh, abdomen, lateral and back) in different groups (sex, age) all reflected that the wool fiber of the back was the finest,the strength was the minimal;And that of abdomen was the thickest,the strength was the maximum. On the other hand, we knew the greater the strength, the fineness was thicker; The smaller the strength, the fineness was finer from the distribution of different fineness range corresponded to the strength. In addition, there was also a positive correlation between them in differernt groups (sex,age),the fineness of adult alpaca was thicker than yearling alpaca, the male alpaca was thicker than female alpaca; The strength of adult alpaca was stronger than yearling alpaca, the male alpaca was stronger than female alpaca. The above results showed that the fineness of alpaca wool fiber was positively correlated with the single fiber strength. 相似文献
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本试验采用相关国家方法标准对321只羊驼毛绒样品开展了纤维细度及单纤维强力参数的检测,旨在分析羊驼毛纤维细度、单纤维强力及二者之间的相关性。结果表明,羊驼侧部毛纤维平均细度为24.30 μm,细度主体范围为18.01~27.00 μm,占样本总量的72%;平均纤维强力为8.31 cN,主体范围为5.01~11.00 cN,占样本总量的88%,说明羊驼毛整体细度较细,强力可满足纺织加工要求。羊驼毛细度和单纤维强力相关性分析发现,不同性别、年龄的羊驼颈部、肩部、股部、腹部、侧部、背部6个不同部位细度、单纤维强力都反映为背部最细,单纤维强力最小,腹部细度最粗,单纤维强力最大;另外,从羊驼毛不同细度区间对应单纤维强力分布也可看出,羊驼毛的单纤维强力值越大其细度值越大,反之越小;除此之外,不同性别、年龄的羊驼毛细度对应单纤维强力也呈正相关,成年羊驼毛细度粗于周岁羊驼,公羊驼毛细度粗于母羊驼,成年羊驼单纤维强力大于周岁羊驼,公羊驼单纤维强力大于母羊驼。综合以上结果,说明羊驼毛细度与单纤维强力呈正相关。 相似文献
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在反刍动物日粮中,粗饲料通常占40%-70%或更高,是反刍动物的重要营养来源。日粮粗纤维不仅对反刍动物有刺激反刍和唾液分泌的作用,还可以提供能量,并以脂肪的形式在体内储存起来。过去,人们往往只重视饲料六大概略养分的分析,而忽略了纤维品质的好坏对饲料营养价值的影响。不同牧草的纤维品质具有很大的差异,但目前对纤维品质进行评价的方法并不多,卢德勋提出用可发酵纤维指数(FFI)对粗饲料的纤维品质进行评定。试验通过测定牧草中的中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)、酸性洗涤木质素(ADL),并以NDF作为底物进行体内降解,测定NDF在瘤胃内的降解率,采用可发酵纤维指数(FFI)来评定牧草的优劣,为今后合理利用牧草提供科学的依据。 相似文献