排序方式： 共有15条查询结果，搜索用时 15 毫秒
1.
2.
3.
Summary Mechanically stirred actinometric solutions of uranyl oxalate, sensitive to radiation below 4300 Å, are found to respond consistently to conditions of solar radiation which are met in Italy during summer, at elevations between 0–3500 metres. The instrumentation developed permits to monitor the course of radiation-dependent chemical reactions in solution, under sunlight. 相似文献
4.
Alberto C. Montefinale Gianna L. Petriconi Henry M. Papee 《Pure and Applied Geophysics》1970,83(1):182-200
Summary A systematic cloud-seeding experiment was conducted in the Prenestine Hills, east of Rome, during the period of time Jan. 1966 – June 1968. The objective was to determine whether the use of monodisperse, electron-emitting giant condensation nuclei, and of giant Al2S3 ice-forming nuclei, both recently developed in our laboratories, could increase the precipitation over an area circumjacent to the site of aerosol dispersion. The method of evaluation involved comparisons of precipitation fallen during the week which followed the aerosolization of about 15 kg. of particulate matter, to the precipitation collected during the fortnight aftet that period. The results show that despite a relatively small amount of nuclei used per seeding operation, and notwithstanding an apparently handicapped design of data evaluation, the normalized and cumulated ratios of precipitation events, associated with those periods of time, indicate significant increases during summer and autumn, and significant decreases during winter season, over the area considered. 相似文献
5.
6.
7.
Gomiero A Da Ros L Nasci C Meneghetti F Spagnolo A Fabi G 《Marine pollution bulletin》2011,62(11):2483-2495
Despite a large number of gas platforms existing in the Adriatic Sea, which is a semi-enclosed basin characterized by a slow turnover rate and increasing industrial as well as other anthropogenic activities, the effects of these structures on the aquatic ecosystem require further investigation. Since 1998, multidisciplinary studies have been performed by CNR-ISMAR to comply with legislation and to support the development of protocols for the monitoring of offshore activities in the Adriatic Sea. The present study was developed to implement a biomonitoring plan to assess the ecotoxicological effects of the extraction activities of an off-shore gas platform. Biomarkers were evaluated in mussels collected from the platform in relation to physiological stress, DNA damage, cellular damage, oxidative stress and exposure effects. Organic contaminants and trace element bioaccumulation were also assessed in the soft body of the mussels to correlate bioaccumulation of pollutants with biomarker responses. The results indicate an absence of platform-related environmental stress. 相似文献
8.
Alberto C. Montefinale Gianna L. Petriconi Enrico G. Gori Henry M. Papee 《Pure and Applied Geophysics》1970,83(1):201-221
Summary Results of intercorrelations between daily average visibilities, at 18 Observatories situated in the Po-Valley, indicate the existence there of several areas within which conditions of fog are similarly affected. The position of those areas reflects the influence of geographic and topographic factors on fogs which regularly recur, during the cold seasons, in that extensive part of Northern Italy. 相似文献
9.
Summary The photodecomposition of ammonium nitrate at various concentrations, in ventilated, aqueous solutions, is investigated as a function of radiation intensity, both under sunlight illumination and under artificial ultraviolet light. The process of decomposition, to nitrogen and water, of ammonium nitrite formed, competes with the formation of NO
2
–
which is, otherwise, proportional to the radiation absorbed. 相似文献
10.
Summary The process of nitrite formation, by the action of the near-ultraviolet radiation on sodium nitrate solutions, is investigated both in the laboratory and at different elevations under sunlight. The release of NO
x
, from solutions irradiated, is found to compete with the generation of nitrite which is proportional to the radiation absorbed by the solution. 相似文献