渔船用小型海水淡化箱的节能应用

针对海上渔船淡水负载紧张的问题,设计一种绿色低碳、热量多级回收集成利用的海水淡化箱。从装置的方案设计、工作流程、技术原理、实验操作和特色应用等方面进行分析。该装置具有集热、蒸发、冷凝一体化、小型化设计的特点,综合利用了鼓泡蒸发、降膜蒸发、强制对流和自然通风等多种强化传热传质技术,有助于推广渔船节能减排新技术,为现代渔业船舶的绿色发展提供参考。

花绒寄甲防治甘肃省二白杨光肩星天牛试验研究

甘肃省嘉峪关地区受光肩星天牛危害严重,以花绒寄甲成虫和卵卡为研究对象,设置释放卵卡、成虫、卵卡和成虫3种不同的防治方案,对二白杨光肩星天牛进行生物防治,2个月后对防治效果进行调查。结果表明:该地区混合释放花绒寄甲成虫和卵卡对光肩星天牛的防治效果最好,防治效果可以达到53.24%,远远高于对照组和释放成虫组、卵卡组。树木解析结果证明了混合释放花绒寄甲卵卡和成虫的防治效果最好,天牛幼虫的减少率平均可达40%以上。

变截面椭圆形独塔斜拉桥塔-梁结合段模型试验研究

为了解某变截面椭圆形独塔斜拉桥的桥塔一主梁结合段的静力学性能,建立了塔一梁结合段1 : 8缩尺试验模型,采用大型地震荷载模拟加载装置对缩尺模型进行了竖向偏心加载试验。通过模型试验与有限元模拟相结合,研究了塔一梁结合段钢板、塔内混凝土和PBL剪力键的应力分布以及受力情况。研究表明:在1.7倍等效设计荷载作用下,该斜拉桥的塔一梁结合段处整体应力水平较低,混凝土竖向正应力约为11 MPa.PBL剪力键的贯穿钢筋承受的最大弯曲应力为63 MPa,钢板承受的最大压应力为227 MPa。研究成果揭示了该变截面椭圆形桥塔斜拉桥的塔一梁结合段在设计荷载作用下的静力学特性,为该类桥塔的设计提供了参考依据。

Effects of Acute and Chronic Cold Stress on Antioxidant Function in Intestinal Tracts of Chickens

This study was to investigate the effects of cold stress on the contents of total antioxidant capacity （T-AOC） malondialdehyde （MDA） and superoxide dismutase （SOD） in duodenum, jejunum and ileum of chickens. A total of 80 15-dayold male chickens were treated by cold stress with the duration of the acute cold stress being 1, 3, 6, 12, and 24 h, and the chronic cold stress was 5, 10, and 20 days, respectively. Cold stress temperature was （12±1）℃. The chemical colorimetric method was used to detect the changes of the T-AOC, SOD activities and MDA contents. The results showed that compared with the corresponding control group, effects of acute cold stress on the T-AOC in duodenum, jejunum and ileum of chickens significantly （P〈0.05） increased firstly and then decreased. Under chronic cold stress, the T-AOC significantly （P〈0.05） decreased. Under acute cold stress and chronic cold stress, the MDA contents significantly （P〈0.05） increased in duodenum, jejunum and ileum of chickens. The effects of acute cold stress on the SOD activities in duodenum, jejunum and ileum of chickens significantly （P〈0.05） increased firstly and then decreased Under chronic cold stress the SOD activities significantly （P〈0.05） decreased in jejunum and ileum, but significantly （P〈0.05） decreased firstly and then increased in duodenum.

气相色谱串联质谱法测定二白杨受害树皮挥发性物质

采用不同吸附方式(活性炭吸附法、Tenax吸附法、固相微萃取法和顶空进样法),结合气相色谱串联质谱,对二白杨受害树皮中的挥发性物质进行分析,比较不同吸附方式的吸附效果,结果表明:二白杨受害树皮的挥发物主要有烷烃类、醇类、酯类、酚类、醛类、芳香烃类、酮类、烯类、酸类、胺类等物质;不同吸附方法测定的物质种类差异性明显,通过对挥发物的数量和响应面积的综合比较,Tenax吸附法和顶空进样法两种吸附方法吸附二白杨受害树皮挥发性物质较好。

铸旋铝合金车轮旋压模具的优化设计

目的保证铸旋车轮短流程制造工艺的实现,提高旋压模具与同一轮型不同铸造毛坯的配合能力,防止因旋压后毛坯尺寸变化过大,造成车轮机加成品率下降的现象。方法以某款车轮旋压模具为研究对象,对其旋压模具结构进行重新设计,增加定位滑块、垫板等设计,提高毛坯与模具的定位与配合,增强模具对毛坯的自适应性。结果对改进后的旋压模具进行试验验证,新结构的旋压模具能够满足不同铸造毛坯的旋压,且控制上模压力在4.5 MPa内,毛坯尺寸合格,性能无影响。结论该旋压模具设计的方法已经应用到了其他铸旋车轮的设计中。

Relationship between the Contents of MDA, the Activity of SOD in Serum of the Milk Goat with Fluorosis and the Erythrocytic Membrane Liquidity

To research the relation among the erythrocytic membrane.liquidity and the contents of MDA, the activity of SOD in serum of the milk goat with fluorosis. An animal model with fluorosis was constructed, and the fluorescent probe technique of DPH was used to measue the erythrocytic membrane liquidity. At the same time, the contents of MDA and the activity of SOD in serum were measured. The results showed that the erythrocytic membrane liquidity in the control group and flurosis group were 5.6742 ± 0.4417 and 3.7248 ± 0.4521 （P 〈0.01） respectively, the contents of MDA in serum were 2.0408 ± 0.198 and 4.494± 0.438 （P 〈0.01） respectively, the activities of SOD were 175.638 ± 22.201 and 113.714 ± 34.258 （P 〈0.01） respectively. The correlation analysis indicated that the relation between the activity of SOD and the liquidity of erythrocytic membrane was positive correlation （ r= 0.7321, P 〈0.05）, whereas the relation between the contents of MDA and the liquidity of erythrocytic membrane was negative correlation （r = -0.6438, P 〈0.01）. The erythrocytic membrane liquidity decreased in milk goat with fluorosis, which played a role in the occurrence and development of the fluorosis. There was correlation among the erythrocytic membrane liquidity and the contents of MDA, the activity of SOD.

显著性增益的块视差立体图像质量评价方法

随着立体影像内容的产出与消费体量爆发式增长,立体影像的舒适度问题引起越来越多的关注。文章结合块视差立体图像质量评价方法,提出了一种基于时序感知的图像显著性感知模型,并用图像显著性对块视差图进行增益,从而获得增益后的图像质量评价模型。实验结果表明,该方法较块视差立体图像质量评价模型的准确性有所提升。