关于奶牛阶段饲养的研究

本研究选择黑白花奶牛进行了阶段饲养与常规饲养的对比试验,对两组牛日粮组成及营养水平、日粮消化率、产奶量、乳成份等进行测定,并进行了经济效益分析。结果表明,试验组泌乳前期、中期和全泌乳期产奶量均显著高于对照组(P<0.05);对于乳脂率,试验组显著高于对照组(P<0.05)。日粮各种营养物质消化率试验组均高于对照组,但差异不显著(P>0.05)。在整个泌乳期期间,试验组比对照组多产奶865.3kg,增加收入640.32元,经济、社会效益显著。可见,阶段饲养新技术充分发挥了高产奶牛的产奶性能。本研究为我区乃至我国奶牛生产提供了科学数据和理论依据。     

~（60）Co辐照茶色水晶及其形成的茶镜工业

将自然透明水晶和人工水晶在￣（６０）Ｃｏ条件下照射获得茶色水晶成功，且具有优良的质量。促进了我国茶色眼镜工业的崛起，为社会创造了较大的经济效益。     

220kV母线隔离开关过热故障分析

随着我国电网的高速发展,电力设备故障非计划停电对生产和生活造成的影响日趋严重,而设备过热是导致电力设备故障的主要原因之一。以一起220kV母线隔离开关过热故障为例,详细探讨造成故障的主要原因及其防范措施,为电力设备的设计、施工和检修提供有益参考。     

Electronic conductive attributes and corrosive behavior of ACF under thermal humid conditions for microelectronic interconnection

Anisotropic conductive adhesive film(ACF) is chosen to substitute for Sn/Pb solder and applied to microelectronic packaging.In this thesis,ACF is composed of polystyrene microspheres(PSt)(3~5 μm) plated with a thin Ni particles(1~2 μm) outside and a special epoxy resin.Both of them are mixed to be ACF.Electronic conductive attributes and corrosive resistance behavior of ACF are analyzed by alternating current impedance measurement and potentiodynamic polarization under highly thermal humid conditions.The results show that after aging 4 h in 80 ℃ and 85% RH condition,contact resistance of ACF increases greatly,and the main reason is the oxidation formation of Ni prevents electric current from going through.Furthermore,the effect of temperature on corrosive behavior of ACF exceeds the effect of humidity,and both of them accelerate the failure of ACF reliability in microelectronic interconnection.Corrosion resistances of ACF are better than that of Sn 37Pb solder in the same case.The possible reason is that Ni is protected by the base epoxy resin,and dispersion of corrosive medium into adhesive interlayer is held back.     

木材高温炭化及导电功能木炭研究进展

木材经高温炭化生成的固体炭化物——木炭具有较高的导电性,以其作为导电功能单元可用于生产电磁屏蔽材料、抗静电材料、电热材料等新型功能材料。文中概述了木材的炭化机理,分析了木炭的基本性能及影响因素,系统地介绍了国内外导电功能木炭的研究进展,提出了今后的研究重点,旨在为开发利用新型功能材料提供科学依据。     

碳系导电填料在抗静电木塑复合材料中的应用初探

简述了几种碳系导电填料的种类特性及其在木塑复合材料中的导电机理;分析了影响碳系导电填料在木塑复合材料中作用效果的几大因素,包括添加量、种类、形态和尺寸、复配、分散性以及制备工艺和成型方法等;提出抗静电木塑复合材料在实际应用中存在的问题,并探讨未来研究方向。     

1例长颈鹿跖骨骨折的诊断和治疗

介绍1例长颈鹿跖骨骨折的诊断与治疗。患鹿左侧跖骨远端开放性横骨折,采用全身镇静配合神经传导阻滞麻醉和局部浸润麻醉,使用外固定支架进行骨折断端的恢复,植入物完成后采用氩弧焊焊接牢固,术后恢复良好。     

不锈钢纤维填充导电膜片的性能研究

为探究不锈钢纤维长度与填充量对导电膜片导电性能与电磁屏蔽性能的影响,将不锈钢纤维均匀地铺撒在涂有脲醛树脂和丙烯酸树脂的表层纸上热压,制备具有电磁屏蔽功能的不锈钢纤维填充导电膜片。首先通过微观结构表征,分析不锈钢纤维在导电膜片平面和断面内的搭接状况;然后采用四电极法与同轴线法测试导电膜片的体积电阻率及电磁屏蔽效能;最后通过理论模拟探究不锈钢纤维填充导电膜片的电磁屏蔽机理。结果表明:1)随着不锈钢纤维填充量的增加,导电膜片平面和断面内不锈钢纤维之间交叉排列的混乱程度不断增加,并以随机排列的形式相互交织形成了有效的“三维导电网络”。2)随着不锈钢纤维长度和填充量的不断增加,导电膜片的体积电阻率逐渐减小,而其电磁屏蔽效能逐渐增大。3)不锈钢纤维的填充量、导电膜片厚度对导电膜片的导电性能影响显著。4)当不锈钢纤维长度为15 mm、填充量为250 g/m2时,导电膜片的体积电阻率降低为6.493×10-3 Ω·cm,电磁屏蔽效能为37.77～51.42 dB,达到中等屏蔽效果,适用于对电磁兼容要求较高的场合。5)理论模拟结果表明,吸收损耗在导电膜片对电磁辐射的屏蔽效果中占有很大的比重,导电膜片表现出了很好的吸波特性。      

导电功能木质复合板材的渗滤阈值

通过导电单元掺杂粘合单元并叠层复合木质单元研究了导电功能木质复合板材的渗滤阈值，结果表明，形成渗滤效应时的阈值为８％－１４％，对应的导电单元施加量和填充量分别约为１４％－２５％和１２％－２０％；形成渗滤效应之后，导电功能的均匀性较好，此外，相关机理和量化关系还有待于深入研究。     

Nature,origin, transport and deposition of andosol parent material in south-central Chile (36–42°S)

The andosols of south-central Chile (36–42°S) are developed on yellow-brown loams that cover the region with a thickness of several meters. In the literature, several hypotheses concerning the nature, origin, mode of transport and deposition of the andosol parent material have been advanced but no general agreement has been found. In this paper, we test these hypotheses by analyzing new representative outcrops located around Icalma (38°50′S) and Puyehue (40°40′S) lakes by a pluri-methodological approach. Our data demonstrate that the andosol parent material has the typical mineralogical and geochemical signature of the regional volcanism and that these deposits are post-glacial in age. The grain size of the deposits and the morphology of the coarse grains evidence that most of these particles haven't been re-transported by wind but are direct volcanic ash falls deposited throughout the Late Glacial and Holocene. Because of the prevailing westerly winds, most of these volcanic ashes have been transported to the East. Following the deposition of the volcanic particles, weathering and pedogenetic processes have transformed part of the volcanic glasses and plagioclases into allophane and have wiped out the original layering. This work demonstrates that most of the andosols that occur in the Andes and in the eastern part of the Intermediate Depression of south-central Chile are developed on volcanic ashes directly deposited by successive volcanic eruptions throughout the Late Glacial and Holocene.