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Search Results: 1 - 10 of 461232 matches for " A. Ceglar "
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Long-term summer sunshine/moisture stress reconstruction from tree-ring widths from Bosnia and Herzegovina
S. Poljan ek, A. Ceglar,T. Levani
Climate of the Past (CP) & Discussions (CPD) , 2013,
Abstract: We present the first summer sunshine reconstruction from tree-ring data for the western part of the Balkan Peninsula. Summer sunshine is tightly connected with moisture stress in trees, because the moisture stress and therefore the width of annual tree-rings is under the influence of the direct and interactive effects of sunshine duration (temperature, precipitation, cloud cover and evapotranspiration). The reconstruction is based on a calibrated z-scored mean chronology, calculated from tree-ring width measurements from 7 representative black pine (Pinus nigra Arnold) sites in Bosnia and Herzegovina (BiH). A combined regression and scaling approach was used for the reconstruction of the summer sunshine. We found a significant negative correlation (r = 0.54, p < 0.0001) with mean June–July sunshine hours from Osijek meteorological station (Croatia). The developed model was used for reconstruction of summer sunshine for the time period 1660–2010. We identified extreme summer events and compared them to available documentary historical sources of drought, volcanic eruptions and other reconstructions from the broader region. All extreme summers with low sunshine hours (1712, 1810, 1815, 1843, 1899 and 1966) are connected with volcanic eruptions.
Correcting mean and extremes in monthly precipitation from 8 regional climate models over Europe
B. Kurnik,L. Kajfe?-Bogataj,A. Ceglar
Climate of the Past Discussions , 2012, DOI: 10.5194/cpd-8-953-2012
Abstract: We corrected monthly precipitation from 8 regional climate models using statistical bias correction. All models were corrected according to observations and parameters for bias correction were obtained for all models separately in every grid cells over European domain, using data between 1961 and 1990. Bias correction was validated in the period between 1991 and 2010 with RMSE, Brier score and Brier skill score. The results are encouraging, as mean and extremes were effectively corrected. After applying correction, large biases over Alps, at the East Adriatic cost, west coast of Norway and at the east end of the domain were removed. RMSE of corrected precipitation was lower than RMSE of simulated in 85% of European area and correction for all models failed in only 1.5% of European area. Also extremes were effectively corrected. According to the Brier skill score the probability for dry months was corrected in more than 52% of the European area and heavy precipitation events were corrected in almost 90% of the area. All validation measures suggest the correction of monthly precipitation was successful and therefore we can argue that the corrected precipitation fields will improve results of the climate impact models.
Long term January–March and May–August temperature reconstructions from tree-ring records from Bosnia and Herzegovina
S. Poljan?ek,A. Ceglar,T. Levani?
Climate of the Past Discussions , 2012, DOI: 10.5194/cpd-8-4401-2012
Abstract: We present the first spring and summer temperature reconstruction for the north-western part of the Balkan Peninsula. The reconstruction is based on tree-ring width measurements from 7 representative black pine (Pinus nigra Arnold) sites in Bosnia and Herzegovina (BiH). We found a significant, positive influence of above-average January–March temperatures on 4 sites (Blace, Peru ica, ator, Konjuh) and a negative influence of above-average May–August temperatures and a positive relationship with an above-average sum of May–August precipitation on tree-ring width formation from 3 sites (Krivaja, Prusac, ipovo). A 31-yr running correlation between temperature and precipitation of the May–August period and tree-ring indices gave a stable relationship between 1901 and the 1960s, after which values of correlation coefficients decrease to the level of significance. A change in summer cyclones in the central part of the Adriatic Sea is presented as a possible cause of the divergence with the climate signal. In the period of calibration and verification of the linear model for the group of 3 sites (Krivaja, Prusac, ipovo), the best relationship was found between tree-ring indices and mean May–August temperatures of the current year. For the group of 4 sites (Blace, Peru ica, ator, Konjuh), the relationship between tree-ring indices and mean January–March temperatures of the current year is the strongest. The developed models were used for reconstruction of May–August temperatures for BiH for the period 1701–1901 and January–March temperatures for the period 1685–1901. Using the method of percentiles (85th and 15th) we identified extreme hot/cool summers and warm/cold springs and compared them to available documentary historical sources and other reconstructions from the broader region.
Establishment of agricultural drought monitoring at different spatial scales in southeastern Europe
Andreja Su nik, Tja a Poga ar, Gregor Gregori , Jo ef Ro kar, Andrej Ceglar
Acta agriculturae Slovenica , 2010, DOI: 10.2478/v10014-010-0015-z
Abstract: To detect temporal and spatial variability of drought is one of the most challenging issues of drought monitoring in the specific country or region due to the fact that there is no standard definition of severity and duration of different types of drought. Crop water deficit (CWD) simulated by crop water balance model IRRFIB supplemented with some in-situ soil water measurements by Time-Domain Reflectometry (TDR) measurement technique are proposed as tools for local agricultural drought monitoring in this study. Moving to regional drought monitoring the main constraint represents data availability of different sources. Available global data sets are of assistance for preparing regional drought monitoring products. In the study two specific products designed for regional scale are described: preliminary maps of the SPI (Standardized Precipitation Index) and products generated by implementation of numerical weather prediction model. It seems to be a lot of potential in both products for a first overview of key meteorological parameters in the region. The development of drought in the year 2009 was under examination and also yearly results for different periods after 1971. Dry periods in the year 2009 heavily impacted cereals in Slovenia. Maize yield showed best agreement with crop water deficit (r = 0.65) and SPI on the time scale of six months for September (r = 0.61). SPI was not suitable for describing agricultural drought in the periods with higher evapotranspiration rate. For more agricultural oriented drought monitoring more indices should be included into the consideration.
Akreditacija - zunanja presoja kakovosti in varnosti zdravstvenih obravnav v zdravstvenih ustanovah
Biserka Sim i , Jakob Ceglar, Dorjan Maru i
Bulletin: Economics, Organisation and Informatics in Healthcare , 2011, DOI: 10.2478/v10221-011-0012-5
Abstract: In 2010, the Ministry of Health prepared a National strategy of quality and safety in health care. One of whose strategic goals is also the development of systematic quality and safety management, which includes the establishment of an accreditation system for health care establishments. The article describes the intention of the national strategy and the meaning of the systematic approach to achieving higher levels of quality and safety in health care. The external audit and the importance of accreditation are presented in this context.
Medopravilnost na podro ju spremljanja stanja su : Interoperability in drought monitoring
Barbara Medved-Cvikl,Andrej Ceglar,Lu?ka Kajfe?-Bogataj
Geodetski Vestnik , 2011,
Abstract: In recent years, major advances in monitoring processes through sectoral control systems have been observed, but so too has the lack of interoperability of spatial information systems. In the frame of the EuroGEOSS project, interoperability between Drought ManagementCentre for Southeastern Europe (DMCSEE) and European Drought Observatory (EDO) has been developed. For interoperability processes, open source tools and Open Geodata Interoperability specifications(OpenGIS) were used ; V zadnjih letih je opazen napredek na podro juspremljanja procesov v prostoru s sektorskimi sistemi nadzora, pri emer je zaznati pomanjkanje medopravilnosti prostorskih informacijskih sistemov. V okviru projekta EuroGEOSS je bila vzpostavljena medopravilnost med Centrom za upravljanje s su o vjugovzhodni Evropi (DMCSEE) in Evropskim su nim portalom (European Drought Observatory – EDO). Pri tem so bila uporabljena odprtokodna orodja in tehnologije OpenGIS.
A comparative study of rainfall erosivity for eastern and western Slovenia
Andrej Ceglar, Zalika repin ek, Vesna Zupanc, Lu ka Kajfe -Bogataj
Acta agriculturae Slovenica , 2008, DOI: 10.2478/v10014-008-0013-6
Abstract: Climate in Slovenia has changed notably over the past century. As regional temperatures have risen, a more vigorous hydrologic cycle ensued; in many places the intensity of rainstorms has become greater. The seasonal distributions of rainfall has changed with significant implications for patterns of vegetation growth and hence for soil erosion. Due to predicted climate change increased frequency of extreme precipitation events can be expected during the time when soil is without plant cover and exposed to the erosive forces. In addition to ample daily and several day precipitation events, water erosion occurs with heavy rainfalls that last from couple of minutes to several hours. Overview of rainfall intensity index and rainfall erosivity, calculated with adapted USLE (universal soil loss equation) method, is given for three meteorological stations in Slovenia for period 1991-2006. Analyzed locations are situated on different climate areas with noticeable different rainfall regime at western (Bilje at Nova Gorica, Rate e) and eastern (Murska Sobota) part of Slovenia.
A Comparative Investigation of Lead Sulfate and Lead Oxide Sulfate Study of Morphology and Thermal Decomposition  [PDF]
S. A. A. Sajadi
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.22024
Abstract: The compound lead oxide sulfate PbSO4.PbO was prepared in our laboratory. The Thermal behavior of PbSO4 was studied using techniques of Thermogravimetry under air atmosphere from 25 to 1200°C. The identity of both compounds was confirmed by XRD technique. Results obtained using both techniques support same decomposition stages for this compound. The electron microscopic investigations are made by SEM and TEM. The compound is characterized by XRD and the purity was determined by analytical Methods. Also a series of thermogravimetric analysis is made and the ideal condition is determined to convert this compound to pure lead oxide.
Metal ion-binding properties of L-glutamic acid and L-aspartic acid, a comparative investigation  [PDF]
S. A. A. Sajadi
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.22013
Abstract: A comparative research has been developed for acidity and stability constants of M(Glu)1, M(Asp)2 and M(Ttr)3 complexes, which have been determined by potentiometric pH titration. Depending on metal ion-binding properties, vital differences in building complex were observed. The present study indicates that in M(Ttr) com-plexes, metal ions are arranged to the carboxyl groups, but in M(Glu) and M(Asp), some metal ions are able to build chelate over amine groups. The results mentioned-above demonstrate that for some M(Glu) and M(Asp) complexes, the stability constants are also largely determined by the affinity of metal ions for amine group. This leads to a kind of selectivity of metal ions, and transfers them through building complexes accompanied with glutamate and aspartate. For heavy metal ions, this building complex helps the absorption and filtration of the blood plasma, and consequently, the excursion of heavy metal ions takes place. This is an important method in micro-dialysis. In this study the different as-pects of stabilization of metal ion complexes regarding to Irving-Williams sequence have been investigated.
Determining the Basaltic Sequence Using Seismic Reflection and Resistivity Methods  [PDF]
A. Alanezi, A. Qadrouh
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.32B004
Abstract:

This study was carried out in Harat Rahat (south of Almadinah Almonwarah) using seismic reflection and resistivity methods. The main objectives of this study are to determine the extent of the basaltic layer and to define the subsurface faults and fractures that could affect and control the groundwater movement in the study area. A 2D seismic profile was acquired and the result shows that the subsurface in the study area has a major fault. We obtained a well match when the seismic result was compared with drilled wells. As a complementary tool, the resistivity method was applied in order to detect the groundwater level. The results of the resistivity method showed that six distinct layers have been identified. The interpretation of these six layers show that the first three layers, the fourth layer, the fifth layer and the bottom of the section indicated various subsurface structures and lithologies; various basaltic layers, fractured basalt, weathered basement and fresh basaltic layers, respectively. It is obvious that the eventual success of geophysical surveys depend on the combination with other subsurface data sources in order to produce accurate maps.

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