3D-FBK pixel sensors: Recent beam tests results with irradiated devices Micelli, A.; Helle, K.; Sandaker, H. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/2011, Letnik:
650, Številka:
1
Journal Article
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The Pixel Detector is the innermost part of the ATLAS experiment tracking device at the Large Hadron Collider, and plays a key role in the reconstruction of the primary vertices from the collisions ...and secondary vertices produced by short-lived particles. To cope with the high level of radiation produced during the collider operation, it is planned to add to the present three layers of silicon pixel sensors which constitute the Pixel Detector, an additional layer (Insertable B-Layer, or IBL) of sensors. 3D silicon sensors are one of the technologies which are under study for the IBL. 3D silicon technology is an innovative combination of very-large-scale integration and Micro-Electro-Mechanical-Systems where electrodes are fabricated inside the silicon bulk instead of being implanted on the wafer surfaces. 3D sensors, with electrodes fully or partially penetrating the silicon substrate, are currently fabricated at different processing facilities in Europe and USA. This paper reports on the 2010 June beam test results for irradiated 3D devices produced at FBK (Trento, Italy). The performance of these devices, all bump-bonded with the ATLAS pixel FE-I3 read-out chip, is compared to that observed before irradiation in a previous beam test.
This study aimed to compare the ability of the three antioxidant ingredients and a minimal application to decrease microleakage of composite resin restoration after intracoronal bleaching. Fifty ...maxillary first incisor that met the inclusion criteria were prepared endodontic treatment. They are divided into 10 groups: control group (no antioxidant), sodium ascorbate 10%, catalase 10% and sodium ascorbate 10% with Tween 80 0.2% and an application period of 1 hour, 24 hours and 48 hours. Applied hydrogen peroxide 35% for 5 days. Samples were restored with composite resin and coated with nail polish, placed China ink for 24 hours. Coronal microleakage was assessed using a stereomicroscope, which showed presented a significant different (ρ<0.05) in 48 hours. It was concluded that sodium ascorbate 10% with Tween 80 0.2% had a significant effect in decreasing coronal microleakage in 48 hours.
This study aimed to compare apical microleakage using tooth clearing method between two softened core obturation techniques which are carrier based gutta percha and continuous wave. Samples are ...maxillary first incisors, with a single root canal. They are devided into three groups of 9 each randomly. The first group is carrier based gutta percha, the second is continuous wave, and the third is lateral condensation as positive control. The teeth were decoronated at the cementoenamel junction, prepared with crown down pressureless technique, and obturated according their group. All the samples were coated with nail polish except for 2 mm from the apical, and then placed in China Ink for 7 days. After that, the polish were removed and the samples undergone tooth clearing procedure. When the samples had been transparant, they were observed using microscop. Data were collected and analyzed using Anova and Tukey’s post hoc test. The study showed that mean of apical microleakage from continuous wave technique (0.256+0.133) is less than from carrier based gutta percha (0.433+0.173). As the conclusion, there is a significant diffrence (p:0.034) of apical microleakage between continuous wave and carrier based gutta percha (p<0.05).
The aim of this research was to determine the microleakage apical sealer based on epoxy resin and methacrylate resin with continuous wave obturation technique.Thirty permanent lateral incisors were ...selected at random and divided into 3 groups (N=10), namely AH Plus obturator group (epoxy resin), EndoREZ group (methacrylate resin), and negative control. The samples were decoronated, root canal preparation, then kept in incubator of 37°C for 72 hours. Sample were coated with nail varnish then immersed in methylene blue for 48 hours. The samples were washed with distilled water, dried and nail varnish removed. The samples were clearing. Penetration was measured using microscope and given score 0-4. Measurements were analyzed statistically. By using Kruskal Wallis test and Mann Whitney test, there is no significant difference between the apical microleakage of the the epoxy resin root canal sealer with methacrylate root canal sealer based (p>0,05). It means that the apical microleakage of the epoxy resin root canal sealer based comparable with merhacrylate root canal sealer based. It was concluded that the apical microleakage of epoxy resin based sealer does not different to the methacrylate resin based sealer
Analysis of the production of ATLAS indium bonded pixel modules Alimonti, G.; Andreazza, A.; Bulgheroni, A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/2006, Letnik:
565, Številka:
1
Journal Article
Recenzirano
The ATLAS collaboration is currently building 1500 pixel modules using the indium bump bonding technique developed by SELEX Sistemi Integrati (former AMS). The indium deposition and flip-chip process ...are described together with an overview of the chip stripping machine that allows defective modules to be reworked. The production is half-way through at the time of this writing. This paper also discusses the problems encountered during production and the adopted solutions.
This study was aimed to determine the effect of epoxy resin-based and MTA-based sealer on fiber post bond strength in the root canal wall.Samples are mandibulary first premolar, with a single root ...canal. They are divided into three groups: negative control group which is a gutta percha obturation without sealer, gutta percha obturation with epoxy resin based sealer AH Plus, and gutta percha obturation with MTA-based sealer MTA Fillapex groups. Samples were decoronated, prepared, obturated and then stored in the incubator at room temperature for one week, the post space were prepared for fiber post insertion. Samples were mounted in the PVC pipes before insertion. Samples were stored in the incubator for one day before bond strength testing. Universal testing machine was used with the speed of 0,5 mm/minutes. Data were collected and analysed using ANOVA.The result showed that the fiber post bond strength in the root canal obturated with epoxy resin-based sealer was higher 12.311 N/mm2 than MTA-based sealer 10.786 N/mm2, but that result was not statistically significant. Therefore, it was concluded that the root canal obturated with epoxy resin-based sealer did not yield a significant bond strength p = 0.689 compared to MTA-based sealer p> 0.05.
This study aims to determine the characteristics of the microhardness impairment root canal dentin after application with different types of EDTA. Samples mandibular premolar teeth with one root ...canal, each divided into 4 groups: EDTA solution, EDTA gel, EDTA cream and negative control; and each group consisted of 6 samples. The teeth were decoronated at cementoenamel junction (CEJ), prepared by the crown down pressureless technique, cut along longitudinal direction, and each sample was attached to selfcured acrylic and then soaked in distilled water. Samples were taken early microhardness measurement by means of Digital Vickers Microhardness Tester. The sample is then applied to the appropriate group of materials EDTA for 5 minutes, except for the negative control group, soaked in saline solution for 5 menit, then performed the final measurement of microhardness of dentin. The results of measurements taken from the average value of measurements made at 3 points, coronal, middle and apical. Data were collected and analyzed using ANOVA and Tukey’s Post Hoc test.The results showed there are differences in dentin microhardness decrease significantly in all treatment groups compared to the negative control group (p <0.05) with the largest drop in the group EDTA solution, amounting to 13 667 kg / mm2. Nevertheless, based on the results of different statistical test further, discovered the value of p> 0.05 which means there is no difference in microhardness reduction in dentin significantly among the test group.
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