196,140 research outputs found
A common-base linear rf power amplifier for 3G cellular applications
No full textA linear power amplifier for 3G cellular applications is presented. The amplifier operates in common-base configuration and can sustain output voltages in excess of BVCEO. The chip, implemented in a 0.25mum SiGe:C technology, occupies 2.76 mm2. When operated from a 4.5 V supply, the amplifier has a measured power gain of 20 dB at 1.85 GHz. At 1 dB Compression Point, the amplifier delivers 27 dBm with a power-added efficiency of 33%. Saturated output power is 28.2 dBm with 37% power-added efficiency
Hypofractionation of partial breast irradiation using radiobiological models
No full textPurpose: To reduce the fraction number in Partial Breast Irradiation (PBI) with initial prescription of 40 Gy in 10 fractions using radiobiological models with specific focus on risk of moderate/severe radiation-induced fibrosis (RIF) and report clinical results. Methods and materials: 68 patients (patient group A) were treated with 40 Gy in 10 fractions delivered by field-in-field, forward-planned IMRT. Isotoxic regimens with decreasing number of fractions were calculated using Biological Effective Dose (BED) to the breast. Risk for RIF in hypofractionated treatment was predicted by calculating NTCP from DVHs of group A rescaled to fractions and dose of novel regimens. Moderate/severe RIF was prospectively scored during follow-up. Various NTCP models, with and without incomplete repair correction, were assessed from difference to observed incidence of RIF. In order to verify the value for α/β of 3 Gy assumed for breast, we fitted α/β to observed incidences of moderate/severe RIF. Results: Treatments with 35 Gy/7f and 28 Gy/4f were selected for the fraction reduction protocol. 75 patients (group B) were treated in 35 Gy/7f. Incidence of moderate/severe RIF was 5.9% in group A, 5.3% in group B. The NTCP model with correction for incomplete repair had lowest difference from observed RIF. The α/β obtained from fitting was 2.8 (95%CIs 1.1-10.7) Gy. Conclusions: The hypofractionated regimen was well tolerated. The model for NTCP corrected for incomplete repair was the most accurate and an assumed α/β value of 3 Gy is consistent with our patient data. The hypofractionation protocol is continuing with patients treated with 28 Gy/4f. © 2015 Associazione Italiana di Fisica Medica
Notice d'estampes en feuilles & encadrées, dessins ayant été reproduits par la gravure... pour cause de cessation de commerce de M. Avanzo... / [expert] Vignères
No full text[Vente. Estampes. 1857-05-14. Paris][Collection. Estampes. Avanzo. 1857]Référence bibliographique : Lugt, 23609Appartient à l’ensemble documentaire : VenteEST2Avec mode text
Sustainable products to control the strawberry angular leafspot
No full textWithin the scope of the EU Regulation proposal on the sustainable use of pesticides to reduce dependence on chemicals until reaching Zero-tolerance by 2030, reliable and convenient alternatives to control the plant bacteriosis are investigated. Unfortunately, sustainable biocontrol agents are not always available or their economic impact on crop production is penalizing compared to the conventional products (e.g. heavy metals and antibiotics). In this study, the essential oils-based product Microsap® BIO 458 (458), the foliar fertilizer Probaction® and the resistance inducer Bion® (unregistered on strawberry) were tested in vitro against Xanthomonas fragariae (Xf, DISTAL 12191 strain), the causal agent of strawberry angular leafspot (ALS). Two experiments on young strawberry plants were carried out under controlled conditions by using 458 at 0.15% and 1%, Probaction® at 0.4% and Bion® treated once at 150 ppm and twice at 100 ppm against ALS. In vitro, all the tested products, except Bion®, resulted bactericidal. In vivo, all products reduced the ALS severity on strawberry plants, in particular, 458 at 0.15% and 1% gave a relative protection (RP) of about 40% and 34%, respectively; Probaction® gave 67% RP, while Bion® treated once and twice provided approx. 38% and 74% RP, respectively. Streptomycin sulphate (100 ppm) used as positive control gave RP of about 65% in the first experiment and of 44% in the second. All tested products showed their ability in reducing ALS severity and thus they offer a valid alternative to chemicals in the disease management to reduce the inoculum sources
Dell'historia della China descritta nella lingua spagnuola, dal p. maestro Giovanni Gonzalez di Mendoza...et tradotta nell'italiana, dal magn. m. Francesco Avanzo... ([Reprod.])
No full textCollection : Italian books before 1601 ; 11.5Collection : Italian books before 1601 ; 11.5Ouvrages avant 180
A novel biological tool for the control of plant diseases caused by the bacterial pathogens Xanthomonas vesicatoria and X . fragariae
No full textThe management of bacterial plant diseases is nowadays limited to copper compounds, regulated by European Union since 2020, to reduce dependence on chemicals until reaching Zero-tolerance within 2030, or to few biological control agents (BCAs). In this study, the efficacy of the foliar fertilizer Probaction® (0.3% and 0.4%) was tested in vitro against strains of Xanthomonas vesicatoria (Xv), X. fragariae (Xf), Pseudomonas savastanoi subsp. savastanoi (Pss) and Erwinia amylovora (Ea). Probaction® was also tested in planta under controlled conditions against bacterial leaf spot of tomato (BLST) and towards strawberry angular leafspot (ALS) caused by Xv and Xf, respectively. On tomato plants cv. VF10, Probaction® (0.3%) was applied at the leaves or at the root apparatus, while on strawberry plants cv. Tea, Probaction® (0.4%) was treated at the leaves. After 24 h, the treated tomato or strawberry plants were inoculated by spraying the Xv or Xf suspension at the leaves; streptomycin sulphate (100 ppm) and sterile distilled water (SDW) were used as positive and negative controls, respectively. In vitro, Probaction® inhibited the growth of Xf, but it was not effective against Xv, Pss and Ea. In planta, the tomato plants treated at leaves or at roots showed a lower BLST severity (ca. 18 and 14 spots/leaf, respectively), compared to that on negative control plants (SDW, ca. 27 spots/leaf). On strawberry plants, Probaction® gave a relative protection (RP), related to SDW treated plants, of about 67%; while streptomycin sulphate, used as positive control, gave about 44%RP. In conclusion, the efficacy of Probaction® in reducing BLST severity, associated to its inability in inhibiting Xv growth in vitro, may suggest its role in triggering the plant immune response; while its direct efficacy in reducing ALS severity offers a valid alternative to chemicals in the disease management to reduce the Xf inoculum sources
Lyophilization model of mannitol water solution in a laboratory scale lyophilizer
No full textThe paper reports on the development of a numerical model for the simulation of a lyophilization process in a vial. Experimental analysis is presented of lyophilization dynamics inside a single vial in a laboratory scale lyophilizer. The problems of lyophilization modelling of a mannitol water solution are covered in detail. The effects of the small scale of the laboratory device with respect to a correct definition of boundary conditions for the numerical simulations are described, especially the effect of the comparatively high temperatures of the chamber walls. In the numerical model, a 1D vial approximation of the governing equations of heat and mass transport with moving front between the frozen and porous part of the cake is used and solved in a time stepping nonlinear iteration procedure. A water vapour diffusion model, implemented in the mass conservation equations, based on the Knudsen model of diffusivities, is applied and linked to the typical pore size of the porous cake. A front tracking scheme with moving computational grid is applied, and a dedicated sub-model of surface layer ice sublimation is introduced, based on the one-sided vapour diffusion model. The comparison of the numerical and the experimental results show that the developed numerical model is able to capture the transition points from primary to secondary drying very accurately, with accompanying accurate capturing of the temperature levels inside of the drying material
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Spontaneous intraparenchymal tension pneumocephalus triggered by compulsive forceful nose blowing
No full textSingle-fraction flattening filter-free volumetric modulated arc therapy for lung cancer: Dosimetric results and comparison with flattened beams technique
No full textPurpose: To report on single-fraction stereotactic body radiotherapy (RT) (SBRT) with flattening filter (FF)-free (FFF) volumetric modulated arc therapy (VMAT) for lung cancer and to compare dosimetric results with VMAT with FF. Methods and materials: Overall, 25 patients were treated with 6-MV FFF VMAT (Varian TrueBeam STx LINAC) to a prescribed dose of 24 Gy in a single fraction. Treatment plans were recreated using FF VMAT. Dose-volume indices, monitor units (MU), and treatment times were compared between FFF and FF VMAT techniques. Results: Dose constraints to PTV, spinal cord, and lungs were reached in FFF and FF plans. In FFF plans, average conformity index was 1.13 (95% CI: 1.07 to1.38). Maximum doses to spinal cord, heart, esophagus, and trachea were 2.9 Gy (95% CI: 0.4 to 6.7 Gy), 0.8 Gy (95% CI: 0 to 3.6 Gy), 3.3 Gy (95% CI: 0.02 to 13.9 Gy), and 1.5 Gy (95% CI: 0 to 4.9 Gy), respectively. Average V7 Gy, V7.4 Gy, and mean dose to the healthy lung were 126.5 cc (95% CI: 41.3 to 248.9 cc), 107.3 cc (95% CI: 18.7 to 232.8 cc), and 1.1 Gy (95% CI: 0.3 to 2.2 Gy), respectively. No statistically significant differences were found in dosimetric results and MU between FF and FFF treatments. Treatment time was reduced by an average factor of 2.31 (95% CI: 2.15 to 2.43) from FF treatments to FFF, and the difference was statistically significant. Conclusions: FFF VMAT for lung SBRT provides equivalent dosimetric results to the target and organs at risk as FF VMAT while significantly reducing treatment time. (C) 2016 American Association of Medical Dosimetrists
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