为对比研究波浪中的实船功率及失速预报方法,以一艘19 000载重吨多用途船为试验对象,开展迎浪规则波中的阻力和自航试验,并分别采用国际拖曳水池会议(International Towing Tank Conference,ITTC)推荐的扭矩转速法(Torque and Revolutio...为对比研究波浪中的实船功率及失速预报方法,以一艘19 000载重吨多用途船为试验对象,开展迎浪规则波中的阻力和自航试验,并分别采用国际拖曳水池会议(International Towing Tank Conference,ITTC)推荐的扭矩转速法(Torque and Revolution Method,QNM)、推力转速法(Thrust and Revolution Method,TNM)、阻力推力一致法(Resistance Thrust Identity Method,RTIM),以及对TNM和RTIM提出的经验修正方式进行失速预报。对比发现:采用这些方法得到的失速预报结果在低海况下基本相近,均在工程允许的精度范围内;受线性波假设影响,波高较高情况下的失速预报结果一般偏大。提出的RTIM经验修正方式考虑了相对旋转效率的影响,适当减小了预报值,且其预报结果与QNM和TNM更接近,证明了其合理性。在实际工程应用中,为节约试验时间与成本,建议采用该方式进行失速预报。展开更多
O484．5 2005021309 VHF-PECVD制备硅薄膜的光发射谱在线监测研究= Study on silicon thin film deposited by VHF-PECVD using OES online monitor[刊,中]／张丽珠(天津机电职业技术学 院．天津(300131)),张晓丹…//光电子技术．-2004,...O484．5 2005021309 VHF-PECVD制备硅薄膜的光发射谱在线监测研究= Study on silicon thin film deposited by VHF-PECVD using OES online monitor[刊,中]／张丽珠(天津机电职业技术学 院．天津(300131)),张晓丹…//光电子技术．-2004,24 (4)．-230-233 用光发射谱(OES)和喇曼散射谱(Raman)研究了 VHF-PECVD制备硅薄膜的结构特性。OES测试结果表 明,随功率增加,对应各基团峰的强度增大;结合喇曼的测 试结果,OES谱得到的结果可以用来定性地表征制备薄膜 的晶化程度;纯化器可以降低制备薄膜中的氧含量,Ra- man测试结果表明相应的晶化率低。图7参4(杨妹清)展开更多
The California least tern （Sternula antillarum browni） is an endangered species. The two largest colonies of this bird species in the San Francisco Bay, California, USA, are located 23 km apart at Alameda Point and ...The California least tern （Sternula antillarum browni） is an endangered species. The two largest colonies of this bird species in the San Francisco Bay, California, USA, are located 23 km apart at Alameda Point and Hayward Regional Shoreline. The Alameda Point colony, on the former Naval Air Station, Alameda, has grown at an average rate of 9.2% per year since its discovery in 1976 and has a nesting density ranging from 1-153 nests per ha. Long-term breeding success at Alameda has averaged 0.86 fledglings per breeding pair. Least tems began appearing in 2003, at an island in Hayward enhanced with substrate mediums and social attraction devices. Successful breeding attempts have been observed at the Hayward colony since 2006. The Hayward colony has grown at an average rate of 51.5% per year, has a nesting density ranging from 33-333 nests per ha and long-term breeding success average of 0.87 fledglings per breeding pair. Dropped fish have been collected from both colonies, and silversides （family Atherinopsidae） are the dominant prey. Alameda terns forage on a greater variety of species than the Hayward terns. The regression results indicate the importance of Northern anchovy （Engraulis mordax） to the breeding success of the Alameda colony.展开更多
文摘为对比研究波浪中的实船功率及失速预报方法,以一艘19 000载重吨多用途船为试验对象,开展迎浪规则波中的阻力和自航试验,并分别采用国际拖曳水池会议(International Towing Tank Conference,ITTC)推荐的扭矩转速法(Torque and Revolution Method,QNM)、推力转速法(Thrust and Revolution Method,TNM)、阻力推力一致法(Resistance Thrust Identity Method,RTIM),以及对TNM和RTIM提出的经验修正方式进行失速预报。对比发现:采用这些方法得到的失速预报结果在低海况下基本相近,均在工程允许的精度范围内;受线性波假设影响,波高较高情况下的失速预报结果一般偏大。提出的RTIM经验修正方式考虑了相对旋转效率的影响,适当减小了预报值,且其预报结果与QNM和TNM更接近,证明了其合理性。在实际工程应用中,为节约试验时间与成本,建议采用该方式进行失速预报。
文摘O484．5 2005021309 VHF-PECVD制备硅薄膜的光发射谱在线监测研究= Study on silicon thin film deposited by VHF-PECVD using OES online monitor[刊,中]／张丽珠(天津机电职业技术学 院．天津(300131)),张晓丹…//光电子技术．-2004,24 (4)．-230-233 用光发射谱(OES)和喇曼散射谱(Raman)研究了 VHF-PECVD制备硅薄膜的结构特性。OES测试结果表 明,随功率增加,对应各基团峰的强度增大;结合喇曼的测 试结果,OES谱得到的结果可以用来定性地表征制备薄膜 的晶化程度;纯化器可以降低制备薄膜中的氧含量,Ra- man测试结果表明相应的晶化率低。图7参4(杨妹清)
文摘The California least tern （Sternula antillarum browni） is an endangered species. The two largest colonies of this bird species in the San Francisco Bay, California, USA, are located 23 km apart at Alameda Point and Hayward Regional Shoreline. The Alameda Point colony, on the former Naval Air Station, Alameda, has grown at an average rate of 9.2% per year since its discovery in 1976 and has a nesting density ranging from 1-153 nests per ha. Long-term breeding success at Alameda has averaged 0.86 fledglings per breeding pair. Least tems began appearing in 2003, at an island in Hayward enhanced with substrate mediums and social attraction devices. Successful breeding attempts have been observed at the Hayward colony since 2006. The Hayward colony has grown at an average rate of 51.5% per year, has a nesting density ranging from 33-333 nests per ha and long-term breeding success average of 0.87 fledglings per breeding pair. Dropped fish have been collected from both colonies, and silversides （family Atherinopsidae） are the dominant prey. Alameda terns forage on a greater variety of species than the Hayward terns. The regression results indicate the importance of Northern anchovy （Engraulis mordax） to the breeding success of the Alameda colony.
