碳酸盐矿物稳定性的热力学特征     

Rail.  LB 刘子忠 《地质科学译丛》1994,11(1):1-3

  相似文献   

丽江高美古天文候选点的视宁度观测   总被引：1，自引：0，他引：1  

于建明  刘子忠  栾蒂  龙康  马开全  张周生 《天文研究与技术》1996,(Z1)

介绍了１９９５年３月至１９９６年３月在云南丽江天文候选点的视宁度观测结果。全年每日２３ｈ至００ｈ，平均Ｒ０为１５．７５ｃｍ（ＦＷＨＭ０．６９８＂）。其中最好的整夜平均Ｒ０为２２．４１ｃｍ（ＦＷＨＭ０．４９＂）。  相似文献   

“嫦娥一号”探月卫星发射期间太阳活动现象监测     

赵世清  李琼英  陶金萍  刘子忠 《云南天文台台刊》2008,(1):97-98

为发射“嫦娥一号”探月卫星,保障其在空间环境运行的安全和国家载人航天计划的正常实施,云南天文台全日面Hα色球望远镜为中国科学院空间环境研究预报中心实时提供太阳活动数据资料,协作完成特殊时期空间环境监测任务。  相似文献   

Navy sonar and cetaceans: just how much does the gun need to smoke before we act?     

Parsons EC  Dolman SJ  Wright AJ  Rose NA  Burns WC 《Marine pollution bulletin》2008,56(7):1248-1257

Cetacean mass stranding events associated with naval mid-frequency sonar use have raised considerable conservation concerns. These strandings have mostly involved beaked whales, with common pathologies, including "bubble lesions" similar to decompression sickness symptoms and acoustic traumas. However, other cetacean species have also stranded coincident with naval exercises. Possible mechanisms for the strandings include a behavioral response that causes deep divers to alter their diving behavior, which then results in decompression sickness-like impacts. Current mitigation measures during military exercises are focused on preventing auditory damage (hearing loss), but there are significant flaws with this approach. Behavioral responses, which occur at lower sound levels than those that cause hearing loss, may be more critical. Thus, mitigation measures should be revised. A growing number of international bodies recognize this issue and have urged increasing scrutiny of sound-producing activities, but many national jurisdictions have resisted calls for increased protection.  相似文献   

Upgrading aquifer test analysis   总被引：1，自引：0，他引：1  

Walton WC 《Ground water》2008,46(5):660-662

  相似文献   

High Zn and Cd accumulation in the oyster Crassostrea rhizophorae, and its relevance as a sentinel species     

de Freitas Rebelo M  do Amaral MC  Pfeiffer WC 《Marine pollution bulletin》2003,46(10):1354-1358

  相似文献   

A synthesis of dominant ecological processes in intensive shrimp ponds and adjacent coastal environments in NE Australia   总被引：4，自引：0，他引：4  

Burford MA  Costanzo SD  Dennison WC  Jackson CJ  Jones AB  McKinnon AD  Preston NP  Trott LA 《Marine pollution bulletin》2003,46(11):1456-1469

One of the key environmental concerns about shrimp farming is the discharge of waters with high levels of nutrients and suspended solids into adjacent waterways. In this paper we synthesize the results of our multidisciplinary research linking ecological processes in intensive shrimp ponds with their downstream impacts in tidal, mangrove-lined creeks. The incorporation of process measurements and bioindicators, in addition to water quality measurements, improved our understanding of the effect of shrimp farm discharges on the ecological health of the receiving water bodies. Changes in water quality parameters were an oversimplification of the ecological effects of water discharges, and use of key measures including primary production rates, phytoplankton responses to nutrients, community shifts in zooplankton and delta15N ratios in marine plants have the potential to provide more integrated and robust measures. Ultimately, reduction in nutrient discharges is most likely to ensure the future sustainability of the industry.  相似文献   

Modelling of hydrodynamics and cohesive sediment transport in Tanshui River estuarine system,Taiwan   总被引：2，自引：0，他引：2  

Liu WC  Hsu MH  Kuo AY 《Marine pollution bulletin》2002,44(10):1076-1088

A laterally averaged two-dimensional numerical model is used to simulate hydrodynamics and cohesive sediment transport in the Tanshui River estuarine system. The model handles tributaries as well as the main stem of the estuarine system. Observed time series of salinity data and tidally averaged salinity distributions have been compared with model results to calibrate the turbulent diffusion coefficients. The overall model verification is achieved with comparisons of residual currents and salinity distribution. The model reproduces the prototype water surface elevation, currents and salinity distributions. Comparisons of the suspended cohesive sediment concentrations calculated by the numerical model and the field data at various stations show good agreement. The validated model is applied to investigate the tidally averaged salinity distributions, residual circulation and suspended sediment concentration under low flow conditions in the Tanshui River estuarine system. The model results show that the limit of salt intrusion in the mainstem estuary is located at Hsin-Hai bridge in Tahan Stream, 26 km from the River mouth under Q75 flow. The null point is located at the head of salt intrusion, using 1 ppt isohaline as an indicator. The tidally averaged sediment concentration distribution exhibits a local maximum around the null point.  相似文献   

云南天文台26cm太阳望远镜在联测期内光球色球观测结果概要(英文)     

吴铭蟾  李治凯  李志  栾蒂  刘子忠 《天文研究与技术》1989,(Z1)

在1988年和1989年的6次日地事件联测期内,云南天文台新建的26cm高分辨真空太阳光球色球望远镜对规定的联测目标活动区均进行了照相监测,特别着重摄取目标活动区黑子群的细节和发生的耀斑。这些照相资料将用于黑子群演化和耀斑细节定位研究。 本文列表给出第Ⅲ次联测(1988年6月24日-7月7日)、第Ⅳ次联测(1988年12月15日-25日)、第Ⅴ次联测(1989年1月11日-19日)、第Ⅵ次联测(1989年3月8日-19日)4次联测期内AR5047、AR5060、AR5278、AR5312、AR5395等5个目标活动区内观测到的1级以上的光学耀斑。 本文选刊AR5278和AR5312两个活动区的Hα和偏带的色球照片以及AR5395大活动区的黑子群和色球的高分辨照片。AR5047和AR5060两个活动区的光球色球照片在本刊另文中登刊。本文对目标活动区及其耀斑活动的特点作简要叙述。这些资料将作进一步的分析研究。  相似文献   

哈雷彗星观测望远镜的跟踪电路     

刘子忠 《天文研究与技术》1987,(2)

本文介绍为适用于观测哈雷彗星而制作的云南天文台HAφA—3四轴望远镜的跟踪电路。跟踪控制电路采用高抗干扰、低功耗的CMOS集成电路;采用步进电机作为驱动器,使跟踪速度方便、连续可调,减少了复杂的机械转动系统,跟踪稳定。实际使用表明,电路可靠、操作灵便,达到预期要求。  相似文献