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Institution

University of Zagreb

EducationZagreb, Grad Zagreb, Croatia
About: University of Zagreb is a education organization based out in Zagreb, Grad Zagreb, Croatia. It is known for research contribution in the topics: Population & European union. The organization has 21769 authors who have published 50267 publications receiving 783239 citations. The organization is also known as: Zagreb University & Sveučilište u Zagrebu.


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Journal ArticleDOI
TL;DR: In this paper, the authors analyzed the properties of 58 type II radio bursts recorded in the meter-to-kilometer wavelength range, focusing on episodes of band-split emission.
Abstract: We analyse properties of 58 type II radio bursts recorded in the meter-to-kilometer wavelength range, focusing on episodes of band-split emission. The basic two parameters utilized are the frequency drift D f = df/dt and the relative band-split BDW = Δf/f of type II burst emission lanes. On average, in the meter-to-kilometer wavelength range D f increases with the emission frequency as D f f 1 . 8 3 , revealing that source velocities are smaller at larger heliocentric distances. The relative band-split shows a weak but statistically significant dependence on the emission frequency, BDW f - 0 . 0 6 , indicating an increase of BDW with the heliocentric distance. Combining the shock velocity estimated from the frequency drift, with the Mach number inferred from the band-split, the Alfven speed and the magnetic field in the ambient plasma can be estimated as a function of the heliocentric distance r. However, the outcome directly depends on the coronal/interplanetary density model used, which is poorly known in the upper corona and the near-Sun interplanetary space. So, we invert the problem: utilizing the results of the previous paper where it was shown that beyond the heliocentric distance of two solar radii (r/r O . = R > 2) the average magnetic field decreases approximately as B R - 2 , we infer the density n(R) in the upper corona and near-Sun interplanetary space. The obtained empirical dependence n(R) is presented in the analytical form as a four-degree polynomial of 1/R, and is compared with some theoretical n(R) models, considering also a deviation from the B 1/R 2 scaling used. The model matches the five-fold Saito density model (representing the active region corona) with the n R - 2 regime in the interplanetary space. Furthermore, it is shown that on average the magnetosonic speed attains a local minimum of v m s 400 km s - 1 around R = 3 and a broad local maximum of v m s 500 km s - 1 in the range R = 4-6, beyond which it gradually decreases to several tens km s - 1 at 1 a.u. The local minimum becomes even deeper if the super-radial expansion of the magnetic field is taken into account. The implications regarding the formation and evolution of shocks in the corona and upper corona are discussed in the framework of CME-piston and flare-blast scenarios. The inferred general decrease of type II burst source velocities and broadening of band-splits with distance is interpreted in terms of the deceleration of mass ejections driving the shocks in the decreasing v m s environment.

150 citations

Journal ArticleDOI
TL;DR: Comparison of blood flow characteristics within uterine fibromas and ovarian malignancies revealed less impedance and higher blood velocity in cases of malignancy.
Abstract: Transvaginal color Doppler was used to analyse a group of 56 patients including 41 with proven pelvic masses and 15 infertility patients with normal pelvic anatomy. All patients were examined by ultrasound before laparoscopy or/and laparo-tomy. The ultrasonographer had not been informed of other clinical findings and indications for operative treatment. Comparison of blood flow characteristics within uterine fibromas and ovarian malignancies revealed less impedance and higher blood velocity in cases of malignancy. When predicting the malignant nature of pelvic tumors, no false-negative results were encounted, and only one false positive diagnosis of malignancy.

150 citations

Journal ArticleDOI
TL;DR: A structural variant of the serotonin 2C (5-HT2C) receptor gene that gives rise to a cysteine to serine substitution in the N terminal extracellular domain of the receptor protein is examined in patients with recurrent major depression, patients with bipolar affective disorder and normal controls.
Abstract: Substantial evidence supports a role for dysfunction of brain serotonergic (5-HT) systems in the pathogenesis of major affective disorder, both unipolar (recurrent major depression) and bipolar.(1) Modification of serotonergic neurotransmission is pivotally implicated in the mechanism of action of antidepressant drugs(2) and also in the action of mood stabilizing agents, particularly lithium carbonate.(3) Accordingly, genes that code for the multiple subtypes of serotonin receptors that have been cloned and are expressed in brain,(4) are strong candidates for a role in the genetic etiology of affective illness. We examined a structural variant of the serotonin 2C (5-HT2C) receptor gene (HTR2C) that gives rise to a cysteine to serine substitution in the N terminal extracellular domain of the receptor protein (cys23ser),(5) in 513 patients with recurrent major depression (MDD-R), 649 patients with bipolar (BP) affective disorder and 901 normal controls. The subjects were drawn from nine European countries participating in the European Collaborative Project on Affective Disorders. There was significant variation in the frequency of the HT2CR ser23 allele among the 10 population groups included in the sample (from 24.6% in Greek control subjects to 9.2% in Scots, chi(2) = 20.9, df 9, P = 0.01). Logistic regression analysis demonstrated that over and above this inter-population variability, there was a significant excess of HT2CR ser23 allele carriers in patients compared to normal controls that was demonstrable for both the MDD (chi(2) = 7.34, df 1, P = 0.006) and BP (chi(2) = 5.45, df 1, P = 0.02) patients. These findings support a possible role for genetically based structural variation in 5-HT2C receptors in the pathogenesis of major affective disorder.

150 citations

Journal ArticleDOI
TL;DR: The aims of this study were to determine the accuracy of the Cameriere method for assessing chronological age in children based on the relationship between age and measurement of open apices in teeth and to compare the accuracy with the widely used Demirjian et al. method.

150 citations

Journal ArticleDOI
TL;DR: The aim of this study was to show the influence of the light intensity of curing units Elipar Trilight, Astralis 7 and Lux-o-Max unit on temperature rise in composite resin sample of Tetric Ceram.
Abstract: The unavoidable consequence of composite resin photopolymerization is temperature rise in tooth tissue. The temperature rise depends not only on the illumination time, but also on light intensity, distance of light guide tip from composite resin surface, composition and shade of composite resin and composite thickness. The most commonly used units for polymerization today are halogen curing units, which emit a large spectrum of wavelengths. A proportion of the spectrum has no influence on degree of conversion and therefore causes unnecessary temperature rise. Units based on light source - blue light emitting diodes (LED), as an alternative for halogen curing units, have been introduced in clinical practice. The aim of this study was to show the influence of the light intensity of curing units Elipar Trilight, Astralis 7 and Lux-o-Max unit on temperature rise in composite resin sample of Tetric Ceram. The temperature was measurement with Metex M-3850 D multimeter with the tip of temperature probe put into unpolymerized composite resin sample 1 mm depth. The highest temperature rise was recorded with standard curing mode for Elipar Trilight halogen curing unit (13.3 +/- 1.21 degrees C after 40 s illumination), while the lowest temperature rise was recorded for the Lux-o-Max unit based on LED technology (5.2 +/- 1.92 degrees C after 40 s illumination).

150 citations


Authors

Showing all 22096 results

NameH-indexPapersCitations
Harry Campbell150897115457
Joseph R. Ecker14838194860
Igor Rudan142658103659
Nikola Godinovic1381469100018
Ivica Puljak134143697548
Damir Lelas133135493354
Željko Ivezić12934484365
Piotr Ponikowski120762131682
Marin Soljacic11776451444
Ivan Dikic10735952088
Ozren Polasek10243652674
Mordechai Segev9972940073
Srdan Verstovsek96104538936
Segev BenZvi9548232127
Mirko Planinic9446731957
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
2023119
2022525
20213,277
20203,360
20193,176
20183,042