生长调节剂对雪柳嫩枝插效果的影响

对雪柳一年生枝条用ABT1和2,4-D 2种生长调节剂的处理试验结果表明,不同的处理药剂能明显提高雪柳枝条扦插的成活率和生根率.其中用5×10-5的2,4-D处理1 h效果最好,其次是用8×10-5 ABT1处理1 h.     

弹性缆对缓解电气承力缆型潜标环境响应的作用

针对电气承力缆型潜标（EMC-SSM）在极端海况下动态响应过大问题，建立了环境响应数学模型。通过某型电气承力缆型潜标在百年一遇海况下的拉力响应计算，研究了弹性缆在缓解电气承力缆型潜标环境响应方面的有效性及不同配置对缓解效果的影响规律。结果表明：长度适合时弹性缆对电气承力缆型潜标的动态响应具有显著的抑制作用，但不合适的长度将加剧其动态响应。最后，给出了弹性缆的设置原则和最短有效长度的确定方法。     

浅谈火力发电厂全厂电缆线路施工

目前,国内火力发电厂厂用电气设备较多、电动机电压等级也不一致,一般来讲,发电厂锅炉辅机及其电气设备、汽机间电气设备、输煤系统电气设备、除尘除灰电气设备、化学水处理系统电气设备、供水系统电气设备、脱硫脱硝系统电气设备等均要采用电力电缆进行输送电能。为保证主机组的运行稳定,必须给厂用电气设备提供稳定可靠的电源,电力电缆必不可少的成为输送和分配电能的载体,优良的电力电缆施工质量是保证电厂各系统电气设备稳定运转的必要条件之一。     

青藏高原腹地第四纪地质环境演化的地球动力学机制

根据古季风变化与生物生产总量之间的耦合关系，结合区域地质演变和地球卫星遥感影像解译成果，对引起高原内部古气候环境变化发展过程的启动激发因素和相互耦合机制及其驱动传递效应进行探索研究，这个方向目前仍然属于高原地质环境演变及全球变化的前沿领域。     

普通高校“西方经济学”教学效果改进的途径探析

"西方经济学"是高校经济类和管理类专业学生必修的专业基础课。本文结合普通高校的特点,分析了教学过程中存在的主要问题,并提出了一些对策。     

推进中国-东盟自由贸易区建设的意义和策略

2010年1月1日,中国-东盟自由贸易区(CAFTA)全面启动。东盟与我国有源远流长的友好关系和日益增长的共同利益,因此成为我国积极参与区域经济一体化建设的首选地区。近年来,我国与东盟的经济联系日益紧密,双方互为重要的贸易伙伴和投资伙伴。CAFTA全面启动给我国带来了深刻的影响,但当前CAFTA也存在一些问题,中国与东盟双方需要协调在产业结构、投资领域、领土争端等方面的矛盾,同时加强双边政治对话与合作。     

Effects of particle size on the mechanical properties of particle-reinforced Sn-Ag composite solder joint

Particulate size has significant influenced on the mechanical properties of particle-reinforced composite solder joints.In this current research,Cu or Ni reinforcement particles were mechanically added to the Sn-3.5Ag eutectic solder,and the effects of the particle size on the mechanical properties of particle-reinforced composite solder joint were systematically studied. This investigation touched on how mechanical properties of the solder joints are affected by particles size.A quantitative formula was se...     

Patterns of artificial avian nest predation by introduced rats in a fragmented laurel forest (Tenerife,Canary Islands)

The importance of introduced rats as damaging factors on island biotas is globally recognized. The predation of artificial avian nests by Ship rats (Rattus rattus) in fragmented laurel forests in Tenerife (Canary Islands) was explored. The influence of road edge, patch type, and position (ground versus tree) on nest survival in two forest remnants differing in conservation degree, were assessed using failure‐time analysis. Overall, nest predation was greater in the preserved than in the disturbed remnant. Nest predation also differed among and within patches, variation being greater within the disturbed remnant. The probability of nest failure was higher at the interior than along the road edge in both remnants, but the road edge effect on nest predation was more intense in the disturbed remnant. Predation pressure was higher in patches of mature, closed canopy or dense understorey with stump sprouting. Ground nests were predated at higher rates than tree nests at any location. These results contrast with other nest predation studies in fragmented landscapes where forest edges rather than the interior are more frequently used by predators. Predatory activity by rats seems negatively affected by forest disturbance and road edge effect. Overall, artificial nest predation patterns by rats confirm a potential predation risk for the avifauna of the Canarian laurel forest. This should be considered in implementing conservation management programmes.     

规模化养殖场污染治理措施的效果分析

分别采样监测了存栏量1600头的生猪养殖场在污染治理措施处理前后排放的废气、废水和固体废物等污染物。结果显示在治理措施处理前,锅炉废气中的烟尘、二氧化硫和二氧化氮等浓度分别为1217.94 mg/m3、76.28 mg/m3和163.46 mg/m3。处理后,分别为131.64 mg/m3、35.16 mg/m3和163.46 mg/m3。恶臭气体在处理前,NH3和H2S强度分别为8.3 kg/h和1.28 kg/h,处理后,分别为1.1 kg/h和0.17 kg/h,强度均显著降低。废水在处理前,CODcr、BOD5、SS、NH3-N、TP以及粪大肠菌群数分别为4202 mg/L、1681 mg/L、1261 mg/L、462 mg/L、33 mg/L、256 21个/mL。处理后,分别为320mg/L、130 mg/L、126 mg/L、64 mg/L、3 mg/L、943个/mL,浓度均显著降低。固体废物方面,通过堆肥工艺处理猪粪、采取安全井填埋措施处理病死猪只、利用林地施肥处理沼渣,实现了固体废物的减量化和无害化。在采取污染治理措施后,污染治理效果明显,对今后同类型养殖场具有参考价值。     

GaN基发光二极管波长偏移的研究

在不同环境温度及不同驱动电流条件下,测试GaN基绿光发光二极管峰值波长的变化,结果表明,环境温度及驱动电流的增加，均会引起结温的增加,但是峰值波长的变化却有区别.在环境温度不变，驱动电流增加过程中，出现LED峰值波长的蓝移现象；在驱动电流不变、环境温度变化过程中，出现LED峰值波长的红移.用能带及极化场耦合模理论，分析实验结果，得到In0.25 GaN0.75阱层的极化场强为3.304MV/cm，垒层的极化场强为-0.826MV/cm；首次引入能隙变量随结温变化率的概念，在LED额定驱动电流范围内，热效应、载流子对极化效应引起的内建电场的屏蔽作用所引的能隙变量随结温变化率分别为3.637×10-4ev/k及1.3025×10-3ev/k，研究认为，二种效应引起的能隙变量随结温的变化率决定着峰值波长偏移的方向.