Some views on the geography of tourism and recreation in Yugoslavia     

Milorad Vasović 《GeoJournal》1984,9(1):83-84

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КРИТИКА     

František Anýž 《Studia Geophysica et Geodaetica》1984,28(3):321-322

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Prediction of the abiotic degradability of organic compounds in the troposphere     

Hans Güsten  Leo Klasinc  Dubravko Marić 《Journal of Atmospheric Chemistry》1984,2(1):83-93

A statistically relevant correlation between the reaction rate coefficient, k _OH, for the OH radical reaction with 161 organic compounds in the gas phase at 300 K, and the corresponding vertical ionisation energies E _i,v, reveals two classes of compounds: aromatics where –log(k _OH/cm³s^-1)3/2E _i,v(eV)–2 and aliphatics where –log(k _OH/cm³s^-1)4/5E _i,v(eV)+3. The prediction of the rate coefficient, k _OH, for the reaction of OH with organic molecules from the above equations has a probability of about 90%. Assuming a global diurnal mean of the OH radical concentration of 5×10⁵ cm³, the upper limit of the tropospheric half-life of organic compounds and their persistence can be estimated.  相似文献   

东亚大陆地震的地球自转动力观测资料分析          下载免费PDF全文

安欧 《地震地质》1987,9(4):71

东亚大陆大地震的活动带走向、活动方式、震源主压应力方向、总迁移方向,沿纬度的分布和发震频度随时间的变化,均与地球自转速率变化有成因联系。本文从地球自转加速、减速、匀速的变化趋势进行这方面的观测资料分析,证明地球速率变化是东亚大陆地震的基本动力来源  相似文献   

鲜水河断裂带大震复发机制和时空分布原因     

安欧 《地震》1995,(3):214-221

岩石接触面在高温高围压下经过几天便烧结起来而有很高但低于原岩的剪切强度。烧结面与主压应力方向夹角大于55—65°时,便不再断裂而沿其它方向剪断。实验最低温压相当地壳10km深,这应是地壳大断裂的上部裂面与下部烧结层的界限深度,受力后便向下延裂,在下部形成震源。这可能是鲜水河断裂带震源在10—25km深重复发生的原因。由带内大震机制解P轴方向与地球自转速率变化趋势的关系、区域残余应力场水平主压应力分布方向与断裂带走向的关系,讨论了带内大震活动时段的原因。由带内裂面烧结条件、残余和现今应力高值区、岩体低强度区及储存弹性应变能高值区的分布,研究了带内大震空间分布原因。  相似文献   

对流和层状云系电活动,对流及降水特性的相关分析   总被引：27，自引：11，他引：27  

张义军  华贵义 《高原气象》1995,14(4):396-405

通过对６次不同云系电特性、回波、对流及降水特性的综合分析，探讨了它们之间的相关性。结果表明：除不稳定能量外，－１０℃层和０℃层高度以及他们之间的高度差、０℃层与云顶的高度差也是表征雷暴动力和电特性的重要参量；雷暴云起电过程对冰相作用有较强的依赖性；雷暴中的电活动与对流活动成正相关，闪电多发生在３０ｄＢｚ强回波高度大于－１０℃层高度时段内，强烈的电活动与强降雨有很好的对应关系，而与一般性降雨对应关系较差；在雷暴消散期，闪电可能会影响雷暴的特性  相似文献   

An experiment with joint mapping of the vertical velocity and its horizontal gradient in the study of recent tectonic movements     

Ivan N. Totomanov 《Journal of Geodynamics》1987,8(2-4)

An experiment is described dealing with the detailed mapping of the vertical velocity V of recent crustal movements in the central Danubian riverside region of the Moesian platform in Northern Bulgaria. The error in V being significant here, the problem of statistical control on the reliability of the initial data and results of such studies is investigated; this question is also relevant for other platform regions in Eastern and Central Europe. With the aim of assessing the significance of a movement, the sampling distribution of V is used. The problem is reduced to a checking of a standard statistical hypothesis and to a probabilistic characterization of V. In order to estimate the statistical significance of the relative velocity δV between neighbouring benchmarks, the distribution of the module G of the horizontal gradient of V is studied. An agreement between the sampling distribution obtained and the theoretical Weibull distribution is established. A sufficiently high probability P>86% is determined for the significance of δV in this region and an optimal interval of the isobases is suggested. The experiment itself embraces three variant solutions: independent mapping of V, independent mapping of G, and mapping of V with respect to G. The analysis and comparison of the results obtained demonstrate the high efficiency of the third solution.  相似文献   

Instrumental Neutron Activation Analysis of NBS 1633a Fly Ash and 1632a Bituminous Coal Reference Samples With the Use of Short Irradiation     

Ivan OBRUSNÍK  Severin PSTA 《Geostandards and Geoanalytical Research》1983,7(2):291-293

Instrumental neutron activation analysis has been applied to the analysis of recently issued NBS reference materials SRM 1633a Fly Ash and SRM 1632a Bituminous Coal. Only the nuclides with half-lives of less than 48 hours have been used. The results for the determination of 18 elements (Fly Ash) and 19 elements (Coal) are compared with the values given by NBS and with recent results obtained by other investigators.  相似文献   

Numerical Modeling of the Ston-Slano (Croatia) Aftershock Sequence     

Herak  Marijan  Herak  Davorka  Markušić  Snježana  Ivančić  Ines 《Studia Geophysica et Geodaetica》2001,45(3):251-266

The rate of aftershock occurrence after the M6 Ston-Slano (Croatia) earthquake is modeled as the Epidemic Type Aftershock Sequence (ETAS). Increase of the modeled cumulative number of aftershocks with time was fitted to observations by the least-squares criterion using the combined grid-search and Monte-Carlo approach. This enabled not only the estimation of the most probable ETAS parameters, but also the determination of their confidence limits, as well as the estimation of the bias between them. It has been found that the bias is significant for some of the parameter pairs, regardless of the threshold magnitude assumed. Residual analyses revealed that all strong aftershocks (M _L 4.5) occurred during the periods of normal to high aftershock activity. There were two periods of quiescence in the sequence, both of which were followed by a strong aftershock.  相似文献   

Lysosomal membrane stability and metallothioneins in digestive gland of Mussels (Mytilus galloprovincialis Lam.) as biomarkers in a field study     

Petrović S  Ozretić B  Krajnović-Ozretić M  Bobinac D 《Marine pollution bulletin》2001,42(12):1373-1378

The lysosomal membrane destabilization and the metallothionein content in the digestive gland cells of mussels (Mytilus galloprovincialis Lam.), collected along the east coast of the North Adriatic (Istrian and Kvarnerine coast, Croatia), were examined over a period of four years (1996–1999). The lysosomal membrane stability, as a biomarker of general stress, showed that the membrane labilization period in mussels from polluted, urban- and industrial-related areas was significantly decreased (p<0.05) when compared to mussels from control, clean sea water sites. In the harbour of Rijeka, the most contaminated site, the lysosomal membrane stability was reduced by more than 70% compared to the control. This method also proved to be a useful biomarker for detection of additional stress caused by short-term hypoxia that occurred once during this study inside the polluted and periodically quite eutrophic Pula Harbour. The concentration of metallothioneins in the mussel digestive gland, as a specific biomarker of exposure to heavy metals, did not reveal significant differences (p<0.05) between sites covered by this study.  相似文献