Background. Simple intratesticular cysts are rare in children and have been considered the most u... more Background. Simple intratesticular cysts are rare in children and have been considered the most uncommon cause of scrotal cystic masses in this age group. The exact etiology of these lesions is still unclear. High-resolution ultrasonography has been proved to be a reliable and accurate imaging modality in the evaluation of scrotal abnormalities in children. Patients and methods. We report the sonographic findings in five boys aged from 4 to 10 months who presented with a scrotal mass and had a simple intratesticular cyst. Ultrasonography showed that all of them displayed a characteristic appearance and provided the necessary information to perform conservative surgery, with testicular preservation in four infants. In one infant, the cyst involved most of the testis, and an orchiectomy was performed. Results. Pathological examination revealed a single smooth-walled cystic structure, with clear and serous fluid, lined with flattened epithelial cells in all of the infants. Conclusion. Our findings appear to support the hypothesis that these cysts could correspond to mesothelial inclusions. Sonographically, differential diagnosis should include mainly epidermoid cysts of the testis, which are mostly cystic but characteristically contain some echoes within them, in contrast to simple cysts and cysts of the tunica albuginea, which lie outside the testicular parenchyma.
CeN thin films were deposited at 573K by reactive arc ion plating sustained by electron beam evap... more CeN thin films were deposited at 573K by reactive arc ion plating sustained by electron beam evaporation. Optical emission observation revealed that Ce vapor arc discharge in nitrogen atmosphere was very localized and the relative emission intensity of Ce+ to atomic Ce was proportional to the arc current, whereas nitrogen gas became less excited with the increasing arc current. The
Exchange bias and spin valve systems with Fe-Mn antiferromagnetic layers of different Fe concentr... more Exchange bias and spin valve systems with Fe-Mn antiferromagnetic layers of different Fe concentrations were obtained by the thermo-ionic vacuum arc method. The adherence of the multilayer system to the Si substrate depends on the Fe-Mn composition. The overall roughness depends on the growing order of the antiferromagnetic/ferromagnetic layers. Very low blocking temperatures for exchange bias were observed for the considered compositions of the Fe-Mn layer. The coercive forces of both the pinned and the free layers of spin valve structures can be considerably modified along a large set of samples simultaneously prepared. r
Beryllium films will be applied in fusion reactors as the first wall tile coating in the near fut... more Beryllium films will be applied in fusion reactors as the first wall tile coating in the near future. The morphology, adhesion and thermal stability of these thin films deposited by the thermionic vacuum arc (TVA) method have been confirmed to be compatible with extremely high demands. Actual Be films used in the future plasma experiments may contain voids or channels causing unwanted porosity which may change the tritium interaction kinetics with the tiles. Permeation through such films is thus the only method to verify film integrity and its capability for hydrogen isotopes migration. In this paper, we present results of hydrogen permeation through 8 m thick Be films deposited by the TVA method on Eurofer membranes having the geometric area exposed to hydrogen of 8.4 cm 2 . The permeation flux was determined on five samples at 400 • C and 1 bar hydrogen pressure. It varied from 5.1 × 10 12 to 3.1 × 10 13 H 2 /(cm 2 s) which means that the permeation reduction factor (PRF) was between 83 and 15, respectively, compared to the uncoated Eurofer membrane. Permeability of Be is reconstructed from these data and compared to published data for bulk Be. The reason for data scatter in our experiments and for even greater scatter of published data is discussed.
Simultaneous discharges of Fe and Cu metal sources by thermoionic vacuum arc (TVA) were used as a... more Simultaneous discharges of Fe and Cu metal sources by thermoionic vacuum arc (TVA) were used as a new procedure for preparation of granular Fe-Cu thin films with sensibly enhanced room temperature giant magnetoresistive effects. The possibilities to produce thin films with a wide range of structural and magneto-transport characteristics are emphasized. The structural aspects of granular Fe-Cu thin films deposited onto Kapton are investigated via X-ray diffractometry, atomic force microscopy and Mfssbauer spectroscopy. The magneto-transport properties are strongly related to composition, structure and magnetic interactions inside the films. D
Carbon and tungsten films were deposited sequentially and simultaneously from two separate plasma... more Carbon and tungsten films were deposited sequentially and simultaneously from two separate plasmas produced by the thermionic vacuum arc (TVA) method. Total film thickness and atomic concentration of C and W were measured for different substrate positions and arc parameters and a comparison between sequential and simultaneous deposition of carbon and tungsten is presented. For the simultaneous case, while keeping the same discharge parameters as in the sequential case, the carbon composition percentage is enhanced despite the presence of the tungsten plasma. When only the carbon deposition rate is increased 10 times, the tungsten atomic concentration drops to a lower level, while the content of carbon becomes dominant for the substrates positioned near the carbon anode.
A search for tt resonances in lepton+jets events with highly boosted top quarks collected in pp c... more A search for tt resonances in lepton+jets events with highly boosted top quarks collected in pp collisions at √ s = 7 TeV with the ATLAS detector
This Letter presents the results of a direct search with the ATLAS detector at the LHC for a Stan... more This Letter presents the results of a direct search with the ATLAS detector at the LHC for a Standard Model Higgs boson of mass 110 ≤ m H ≤ 130 GeV produced in association with a W or Z boson and decaying to bb. Three decay channels are considered: ZH → ℓ + ℓ − bb, W H → ℓνbb and ZH → ννbb, where ℓ corresponds to an electron or a muon. No evidence for Higgs boson production is observed in a dataset of 7 TeV pp collisions corresponding to 4.7 fb −1 of integrated luminosity collected by ATLAS in 2011. Exclusion limits on Higgs boson production, at the 95% confidence level, of 2.5 to 5.5 times the Standard Model cross section are obtained in the mass range 110-130 GeV. The expected exclusion limits range between 2.5 and 4.9 for the same mass interval.
Background. Simple intratesticular cysts are rare in children and have been considered the most u... more Background. Simple intratesticular cysts are rare in children and have been considered the most uncommon cause of scrotal cystic masses in this age group. The exact etiology of these lesions is still unclear. High-resolution ultrasonography has been proved to be a reliable and accurate imaging modality in the evaluation of scrotal abnormalities in children. Patients and methods. We report the sonographic findings in five boys aged from 4 to 10 months who presented with a scrotal mass and had a simple intratesticular cyst. Ultrasonography showed that all of them displayed a characteristic appearance and provided the necessary information to perform conservative surgery, with testicular preservation in four infants. In one infant, the cyst involved most of the testis, and an orchiectomy was performed. Results. Pathological examination revealed a single smooth-walled cystic structure, with clear and serous fluid, lined with flattened epithelial cells in all of the infants. Conclusion. Our findings appear to support the hypothesis that these cysts could correspond to mesothelial inclusions. Sonographically, differential diagnosis should include mainly epidermoid cysts of the testis, which are mostly cystic but characteristically contain some echoes within them, in contrast to simple cysts and cysts of the tunica albuginea, which lie outside the testicular parenchyma.
CeN thin films were deposited at 573K by reactive arc ion plating sustained by electron beam evap... more CeN thin films were deposited at 573K by reactive arc ion plating sustained by electron beam evaporation. Optical emission observation revealed that Ce vapor arc discharge in nitrogen atmosphere was very localized and the relative emission intensity of Ce+ to atomic Ce was proportional to the arc current, whereas nitrogen gas became less excited with the increasing arc current. The
Exchange bias and spin valve systems with Fe-Mn antiferromagnetic layers of different Fe concentr... more Exchange bias and spin valve systems with Fe-Mn antiferromagnetic layers of different Fe concentrations were obtained by the thermo-ionic vacuum arc method. The adherence of the multilayer system to the Si substrate depends on the Fe-Mn composition. The overall roughness depends on the growing order of the antiferromagnetic/ferromagnetic layers. Very low blocking temperatures for exchange bias were observed for the considered compositions of the Fe-Mn layer. The coercive forces of both the pinned and the free layers of spin valve structures can be considerably modified along a large set of samples simultaneously prepared. r
Beryllium films will be applied in fusion reactors as the first wall tile coating in the near fut... more Beryllium films will be applied in fusion reactors as the first wall tile coating in the near future. The morphology, adhesion and thermal stability of these thin films deposited by the thermionic vacuum arc (TVA) method have been confirmed to be compatible with extremely high demands. Actual Be films used in the future plasma experiments may contain voids or channels causing unwanted porosity which may change the tritium interaction kinetics with the tiles. Permeation through such films is thus the only method to verify film integrity and its capability for hydrogen isotopes migration. In this paper, we present results of hydrogen permeation through 8 m thick Be films deposited by the TVA method on Eurofer membranes having the geometric area exposed to hydrogen of 8.4 cm 2 . The permeation flux was determined on five samples at 400 • C and 1 bar hydrogen pressure. It varied from 5.1 × 10 12 to 3.1 × 10 13 H 2 /(cm 2 s) which means that the permeation reduction factor (PRF) was between 83 and 15, respectively, compared to the uncoated Eurofer membrane. Permeability of Be is reconstructed from these data and compared to published data for bulk Be. The reason for data scatter in our experiments and for even greater scatter of published data is discussed.
Simultaneous discharges of Fe and Cu metal sources by thermoionic vacuum arc (TVA) were used as a... more Simultaneous discharges of Fe and Cu metal sources by thermoionic vacuum arc (TVA) were used as a new procedure for preparation of granular Fe-Cu thin films with sensibly enhanced room temperature giant magnetoresistive effects. The possibilities to produce thin films with a wide range of structural and magneto-transport characteristics are emphasized. The structural aspects of granular Fe-Cu thin films deposited onto Kapton are investigated via X-ray diffractometry, atomic force microscopy and Mfssbauer spectroscopy. The magneto-transport properties are strongly related to composition, structure and magnetic interactions inside the films. D
Carbon and tungsten films were deposited sequentially and simultaneously from two separate plasma... more Carbon and tungsten films were deposited sequentially and simultaneously from two separate plasmas produced by the thermionic vacuum arc (TVA) method. Total film thickness and atomic concentration of C and W were measured for different substrate positions and arc parameters and a comparison between sequential and simultaneous deposition of carbon and tungsten is presented. For the simultaneous case, while keeping the same discharge parameters as in the sequential case, the carbon composition percentage is enhanced despite the presence of the tungsten plasma. When only the carbon deposition rate is increased 10 times, the tungsten atomic concentration drops to a lower level, while the content of carbon becomes dominant for the substrates positioned near the carbon anode.
A search for tt resonances in lepton+jets events with highly boosted top quarks collected in pp c... more A search for tt resonances in lepton+jets events with highly boosted top quarks collected in pp collisions at √ s = 7 TeV with the ATLAS detector
This Letter presents the results of a direct search with the ATLAS detector at the LHC for a Stan... more This Letter presents the results of a direct search with the ATLAS detector at the LHC for a Standard Model Higgs boson of mass 110 ≤ m H ≤ 130 GeV produced in association with a W or Z boson and decaying to bb. Three decay channels are considered: ZH → ℓ + ℓ − bb, W H → ℓνbb and ZH → ννbb, where ℓ corresponds to an electron or a muon. No evidence for Higgs boson production is observed in a dataset of 7 TeV pp collisions corresponding to 4.7 fb −1 of integrated luminosity collected by ATLAS in 2011. Exclusion limits on Higgs boson production, at the 95% confidence level, of 2.5 to 5.5 times the Standard Model cross section are obtained in the mass range 110-130 GeV. The expected exclusion limits range between 2.5 and 4.9 for the same mass interval.
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Papers by Cristian Arce