The effects of mafic-felsic magma interaction on magma diversity: insights from an early Paleozoic hornblendite-quartz monzonite suite in the South China block     

Xu  Wenjing  Xu  Xisheng  Wang  Yuejun  Brzozowski  Matthew Jacek 《Mineralogy and Petrology》2020,114(1):71-90

Mineralogy and Petrology - Understanding the mechanisms responsible for the interplay between mafic and felsic magmas is the key to retrieving information on their sources, and characterizing the...  相似文献   

Location of the Rheic suture in the eastern Bohemian Massif: evidence from detrital zircon data     

Stanisław Mazur  Jacek Szczepański  Krzysztof Turniak  Neal J. McNaughton 《地学学报》2012,24(3):199-206

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Methodology to evaluate the renewal period of carbonate aquifers: a key tool for their management in arid and semiarid regions,with the example of Becerrero aquifer,Spain   总被引：2，自引：2，他引：0  

Sergio Martos-Rosillo  Carlos Marín-Lechado  Antonio Pedrera  Iñaki Vadillo  Jacek Motyka  José Luis Molina  Pilar Ortiz  José María Martín Ramírez 《Hydrogeology Journal》2014,22(3):679-689

A methodological procedure is proposed for determining the renewal period (RP), which expresses the ratio of total storage to recharge of carbonate aquifers, and it was applied to the overexploited moderate-size Becerrero carbonate aquifer (southern Spain). To this end, geological and subsurface data—time domain electromagnetic (TEM) soundings and borehole logs—were integrated to construct a three-dimensional (3D) geological model of the aquifer. The interconnected porosity was estimated by analyzing 73 rock samples. The resulting 3D geometrical model makes it possible to quantify the fractions of the aquifer having a confined or unconfined behaviour. Based on the total storage capacity (179?·?10⁶–514?·?10⁶ m³) and available aquifer recharge estimation (4.8?·?10⁶–6.4?·?10⁶ m³/year), an RP between 37 and 106 years is obtained. In view of the RP, an exploitation rate slightly lower than the average recharge of the system is recommended, so that the piezometric level will be stable but below the discharge head that is produced through the springs in natural conditions. The proposed methodology to obtain an aquifer RP and the management strategies designed accordingly are of broad interest, especially for carbonate aquifers, which are abundant in arid and semiarid regions.  相似文献   

Weiwoboidae fam.nov.of 'Higher' Fulgoroidea (Hemiptera:Fulgoromorpha) from the Eocene Deposits of Yunnan,China     

Lin Qibin  Jacek Szwedo  Huang Diying  Adam Stroiński 《《地质学报》英文版》2010,84(4):751-755

<正>A new family of so-called‘higher' planthoppers,Weiwoboidae fam.nov.,from the Lower Eocene of Yunnan is described.A new monotypic genus,Weiwoboa gen.nov.,with Weiwoboa meridiana sp.nov.is also described and illustrated.The characters of tegmen venation of the new family,its evolution,and supposed relationships are briefly discussed.  相似文献   

Microelectrona cladara gen.et sp.nov.:A New Protodikraneurini from the Eocene Baltic Amber(Hemiptera:Cicadomorpha:Cicadellidae:Typhlocybinae)     

Jacek Szwedo  Cezary G?bicki  Magdalena Kowalewska 《《地质学报》英文版》2010,84(4):696-704

<正>A new genus Microelectrona gen.nov.and species Microelectrona cladara sp.nov.of the extinct tribe Protodikraneurini of the leafhoppers(Cicadeilidae:Typhlocybinae) from the Eocene Baltic amber is described. The piece of amber containing leafhopper inclusion is broken,unveiling some of the morphological structures,and enabling their studies using scanning electron microscopy.  相似文献   

Exploring spatial autocorrelation of life expectancy in Poland with global and local statistics     

Jacek Malczewski 《GeoJournal》2010,75(1):79-92

The paper presents an exploratory analysis of the geographical patterns of life expectancy at birth by sex in Poland. For the purpose of spatial statistical analysis the geographical variation of life expectancy is partitioned into two components: regional (global) trend and the local variation (or residuals). The spatial autocorrelations of the residuals from the trend surface analysis are examined using global and local statistics. The results indicate that there are statistically significant geographical clusters of high and low life expectancies for men and women in Poland.  相似文献   

Non‐coaxiality and stress–dilatancy rule in granular materials: FE investigation within micro‐polar hypoplasticity     

Jacek Tejchman  Wei Wu 《国际地质力学数值与分析法杂志》2009,33(1):117-142

This paper deals with FE investigations of shear localization in dilatant granular bodies. The calculations were carried out with a hypoplastic constitutive law enhanced by micro‐polar terms to properly model the shear zone evolution. The behaviour of an initially medium dense sand specimen with very smooth and very rough horizontal boundaries was analyzed during a plane strain compression test. A stochastic distribution of the initial void ratio was assumed to be spatially correlated. Attention was focused on the non‐coaxiality of the directions of the principal strain increments and principal stresses in the shear zone and on the stress–dilatancy rule. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

Non-uniform seasonal defrosting of subpolar dune field on Mars     

Konrad J Kossacki  Jacek Leliwa-Kopystyński 《Icarus》2004,168(1):201-204

Images of the sub-polar regions of Mars show existence of various seasonal-depending features, including mosaics of dark patches called Dalmatian spots. We interpret formation of dark patches on dune fields by means of the non-uniform sublimation of winter CO₂ ice deposit.  相似文献   

Systematic effects in the sound horizon scale measurements     

Jacek Guzik  Gary Bernstein  Robert E. Smith 《Monthly notices of the Royal Astronomical Society》2007,375(4):1329-1337

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Assessment of GPS + Galileo and multi-frequency Galileo single-epoch precise positioning with network corrections   总被引：1，自引：0，他引：1  

Jacek Paziewski  Pawel Wielgosz 《GPS Solutions》2014,18(4):571-579

Several processing strategies that use dual-frequency GPS-only solution, multi-frequency Galileo-only solution, and finally tightly combined dual-frequency GPS + Galileo solution were tested and analyzed for their applicability to single-epoch long-range precise positioning. In particular, a multi-system GPS + Galileo solution was compared to GPS double-frequency solution as well as to Galileo double-, triple-, and quadruple-frequency solutions. Also, the performance of the strategies was analyzed under clear-sky and obstructed satellite visibility in both single-baseline and multi-baseline modes. The results indicate that tightly combined GPS + Galileo instantaneous positioning has a clear advantage over single-system solutions and provides an accurate and reliable solution. It was also confirmed that application of multi-frequency observations in case of Galileo system has an advantage over a dual-frequency solution.  相似文献