On photometric properties of Saturn's rings     

Kari Lumme 《Astrophysics and Space Science》1970,8(1):90-101

The photometric observations of Saturn's rings made by Camichel (1958a), and Focas and Dollfus (1969) are studied. It has been found that, at large elevation angles multiple scattering between ring particles, and at small elevation angles deviation from Seeliger's principal photometric theory can explain the observations. The geometric albedo 0.82 and the Bond albedo 0.90 have been suggested for the ring particles. The optical thickness of ring B is found to be 1.25 and that of ring A 0.30.  相似文献   

Measurements of biomarker levels in flounder (Platichthys flesus) and blue mussel (Mytilus trossulus) from the Gulf of Gdańsk (southern Baltic)     

Kopecka J  Lehtonen KK  Barsiene J  Broeg K  Vuorinen PJ  Gercken J  Pempkowiak J 《Marine pollution bulletin》2006,53(8-9):406-421

In the framework of the EU funded BEEP project a set of biomarkers, gross morphometric indices and tissue concentrations of selected organic pollutants were measured in flounder (Platichthys flesus) and mussels (Mytilus trossulus) collected twice a year (April and October) from three sites in the inner Gulf of Gdańsk between autumn 2001 and spring 2003. In flounder, seasonal differences in most biomarkers were observed, but no correlations with tissue pollutant levels could be found. In mussels, highly variable levels in biomarker responses were seen, but no clear seasonal or spatial trends, directly related to tissue concentrations, could be established. The observed biomarkers distribution the study sites are probably mostly caused by interannual, seasonal and individual variability and, in case of flounder, possibly by exchange of stocks between the sampling sites.  相似文献   

Superhyperbolic expansion,noncollision singularities and symmetry configurations     

Donald G. Saari  Florin N. Diacu 《Celestial Mechanics and Dynamical Astronomy》1994,60(1):91-98

A large class of symmetry solutions of the Newtonian n-body problem cannot end in a noncollision singularity nor expand faster than any constant multiple of time.Following a suggestion from Christian Marchal, we extended the original theme of this essay to include superhyperbolic motion. The work of D. Saari was supported by NSF Grant ISI 9103180; the work of F. Diacu was supported by NSERC Grant 3-48376  相似文献   

Book review     

Kari Saari 《Rock Mechanics and Rock Engineering》1988,21(3):229-231

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Age determination of Baltic herring from whole otoliths and from neutral red stained otolith cross sections   总被引：2，自引：1，他引：2  

Peltonen  Heikki; Raitaniemi  Jari; Parmanne  Raimo; Eklund  Jan; Nyberg  Kari; Halling  Folke 《ICES Journal of Marine Science》2002,59(2):323-332

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Crowdsourcing The National Map     

Elizabeth A. McCartney  Kari J. Craun  Erin Korris  David A. Brostuen  Laurence R. Moore 《制图学和地理信息科学》2015,42(4):54-57

Using crowdsourcing techniques, the US Geological Survey’s (USGS) Volunteered Geographic Information (VGI) project known as “The National Map Corps (TNMCorps)” encourages citizen scientists to collect and edit data about man-made structures in an effort to provide accurate and authoritative map data for the USGS National Geospatial Program’s web-based The National Map. VGI is not new to the USGS, but past efforts have been hampered by available technologies. Building on lessons learned, TNMCorps volunteers are successfully editing 10 different structure types in all 50 states as well as Puerto Rico and the US Virgin Islands.  相似文献   

Biomarker responses in flounder (Platichthys flesus) and mussel (Mytilus edulis) in the Klaipeda-Būtinge area (Baltic Sea)     

Barsiene J  Lehtonen KK  Koehler A  Broeg K  Vuorinen PJ  Lang T  Pempkowiak J  Syvokiene J  Dedonyte V  Rybakovas A  Repecka R  Vuontisjärvi H  Kopecka J 《Marine pollution bulletin》2006,53(8-9):422-436

During the EU project BEEP a battery of biomarkers was applied in flounder (Platichthys flesus) and the blue mussel (Mytilus edulis) collected at three locations off the Lithuanian coast (Baltic Sea) in June and September 2001 and 2002. The elevated biomarker responses in specimens sampled in September 2001 were apparently related to the extensive dredging activities in the Klaipeda port area and subsequent dumping of contaminated sediments. High concentrations of organic pollutants (organochlorines and PBDEs) were also measured in the tissues of both indicator species. In addition, response levels of genotoxicity, cytotoxicity, immunotoxicity as well as concentrations of PAH metabolites in the bile of flounder showed elevations in 2002 after an oil spill in the Būtinge oil terminal in November 2001. In flounder, biomarker measurements 10 months after the spill indicated recovery processes but in mussels a high level of genotoxicity could still be observed 22 months later. The present study illustrates the usefulness of the multi-biomarker approach in the detection of biological effects of pollution in this region of the Baltic Sea.  相似文献   

The BEEP project in the Baltic Sea: overview of results and outline for a regional biological effects monitoring strategy   总被引：1，自引：0，他引：1  

Lehtonen KK  Schiedek D  Köhler A  Lang T  Vuorinen PJ  Förlin L  Barsiene J  Pempkowiak J  Gercken J 《Marine pollution bulletin》2006,53(8-9):523-537

Field studies in the framework of the EU funded BEEP project (Biological Effects of Environmental Pollution in Marine Coastal Ecosystems, 2001-2004) aimed at validating and intercalibrating a battery of biomarkers of contaminant exposure and effects in selected indicator species in the Mediterranean, the North Atlantic and the Baltic Seas. Major strategic goals of the BEEP project were the development of a sensitive and cost-efficient biological effects monitoring approach, delivery of information and advice to end-user groups, and the implementation of a network of biomarker researchers around Europe. Based on the main results obtained in the Baltic Sea component of the BEEP the present paper summarises and assesses the applicability of biomarkers for different regions and species in this sea area. Moreover, a general strategy and some practical considerations for the monitoring of biological effects in the Baltic Sea are outlined.  相似文献   

Intranight polarization variability in radio-loud and radio-quiet AGN     

Carolin Villforth  Kari Nilsson  Roy Østensen  Jochen Heidt  Sami-Matias Niemi  Janine Pforr 《Monthly notices of the Royal Astronomical Society》2009,397(4):1893-1908

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Managing organizational change in an international scientific network: A study of ICES reform processes     

Kari Stange  Per Olsson  Henrik Österblom 《Marine Policy》2012,36(3):681-688

Organizations involved in the governance of natural resources are challenged to adjust to the call for more holistic management approaches. This often necessitates organizational change. Here change processes in the International Council for the Exploration of the Sea (ICES) during the years 1998–2009 are investigated using semi-structured interviews combined with observations and review of documents. Several organizational reforms were implemented during the time period studied. The major drivers were the need to improve efficiency and a striving for better integration between different components within the organization. The reform processes were driven forward by individuals who navigated between opportunities and constrains embedded in the network structure of ICES. This required good leadership and communication skills. Broad consultations were important to ensure support within the ICES community. By increasing the understanding of the dynamics of change in organizations, which operate at the science–policy interface developments in desired directions can be facilitated.  相似文献