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排序方式： 共有330条查询结果，搜索用时 15 毫秒
31.
Maurizio Aceto Ornella Abollino Maria Concetta Bruzzoniti Edoardo Mentasti Corrado Sarzanini Mery Malandrino 《Food Additives & Contaminants》2002,19(2):126-133
Metals in wine occur at the mg l 1 level or less and, though not directly related to the taste of the final product, their content should be determined because excess is undesirable, and in some cases prohibited, due to potential toxicity. Lead content in wine, for example, is restricted in several states by legislation to guarantee consumer health protection. Of several methods for metal determination, techniques of atomic spectroscopy are the most sensitive and rapid. Most of the elements present in wine can be determined with these techniques, at concentrations ranging from the mg l -1 to the μg l -1 level. Here, inductively coupled plasma-atomic emission spectrometry (ICP-AES), flame atomic absorption spectrometry (flame-AAS) and graphite furnace-atomic absorption spectrometry (GF-AAS) are compared for their characteristics as employed in metal determination in wine. 相似文献
32.
Nadir Vanni;Antonella Giuri;Mario Calora;Edoardo Podda;Anna Paola Caricato;Katia Sparnacci;Riikka Suhonen;Mari Ylikunnari;Amanda Covarelli;Luca Gregori;Filippo De Angelis;Gianluigi Marra;Paolo Biagini;Riccardo Po;Aurora Rizzo; 《Solar RRL》2024,8(22):2400612
Metal–halide perovskites have gained extreme interest in the photovoltaic field with formamidinium lead iodide (FAPbI3) currently being one of the best-performing materials for single-junction solar cells. Despite the outstanding record efficiencies, there are still several major issues hindering the large-scale fabrication of perovskite solar cells. The vulnerability to environmental agents along with the need of controlled atmosphere and crystallization aids for the perovskite film deposition represents the major roadblocks. This is particularly true for FAPbI3 for which the thermodynamically stable phase at room temperature is photovoltaically inactive δ-phase. To address those challenges, herein, a camphorsulfonic-salified chitosan is specifically designed with the aid of DTF calculations to strongly interact with the perovskite and, as a result, improve the morphology and optoelectronic quality of the FAPbI3. Thanks to the numerous interactions and then the modulation of the solution viscosity, FAPbI3 devices are fabricated by gravure printing deposition without either antisolvent bath or inclusion of methylammonium chloride (MACl) as additive. The gravure-printed devices with the chitosan feature an enhanced efficiency and stability in air, retaining 80% of the original efficiency after 1200 h in ambient air without any encapsulation. 相似文献
33.
34.
Infrastructures (viaducts, bridges, tunnels, railways, and roads) are fundamental to allow people and goods move around a country. In particular, in Italy, due to its orographic and morphological complexity, the ratio between the number of viaducts and the national geographical extension is the largest in Europe. This kind of structure constitutes a weakness of the road networks, especially those over 50 years old, and among these, prestressed concrete structures are the most vulnerable. Therefore, the study of the robustness of an infrastructure network is a quite useful topic for modern societies and public mobility managers. The aim of the present work is to develop a reliable and fast analysis tool capable of processing many structures in a relatively short time. In order to calibrate the most suitable instrument, starting from the study of an experimental campaign on six prototypes of artificially corroded posttensioned concrete beams, the reliability of concentrated plasticity models was investigated to reproduce force-displacement diagrams and in particular, the effect of corrosion on the moment-curvature relationship. In fact, this method could provide a well-defined nonlinear analysis of prestressed elements, especially in the case of grillage decks where external girders could be more affected by corrosion damage in opposition to internal girders or diaphragms. A numerical model by FEM analysis is also presented to reproduce a vulnerability study on an actual structure. 相似文献
35.
Fabio Bolzoni Marco Ormellese Mariapia Pedeferri Edoardo Proverbio 《Structural Concrete》2023,24(1):115-126
Rebar corrosion in concrete has been neglected for a long time in the scientific and technical literature, as reinforced concrete was considered an “eternal” material. Only during the 60s, and more during the 70s and the 80s, several research groups and many corrosion schools gave important contributions. An important impact was also achieved by Italian researchers thanks to the Universities of Roma, Napoli, Ancona, Ferrara, Bergamo, and Politecnico di Milano, where professor Pietro Pedeferri and his school contributed to the study of stainless steel reinforcement, corrosion inhibitors, service life modeling, cathodic protection and cathodic prevention, the latter proposed by Pedeferri in the early 90s. The paper is dedicated to the memory of Pietro Pedeferri (1938–2008) and Luca Bertolini (1966–2017). 相似文献
36.
Mariangela Rondanelli Filip Haxhari Clara Gasparri Gaetan Claude Barrile Alessandro Cavioni Davide Guido Francesca Mansueto Marco Zese Giuseppe Mazzola Alessia Moroni Zaria Patelli Gabriella Peroni Martina Pirola Alice Tartara Enrico Cantaluppi Luigi Campanini Edoardo Magnani Sergio Feccia Simone Perna 《Starch - St?rke》2023,75(9-10):2300031
37.
Valentina Serra Edoardo Fiorillo Francesco Cucca Valeria Orr 《International journal of molecular sciences》2023,24(1)
The use of cryopreserved peripheral blood mononuclear cells is common in biological research. It is widely accepted that primary cells are rendered unusable by several freezing cycles, although this practice might be very helpful when the biological material is valuable and its re-collection is impractical. To determine the extent to which primary cells undergoing repeated freezing cycles are comparable to one another and to fresh samples, we evaluated overall lymphocyte viability, their proliferation and cytokine production capabilities, as well as the levels of 27 cell subtypes in ten human peripheral blood mononuclear cells frozen for five years and repeatedly thawed. As expected, we observed a progressive increase in cell death percentages on three rounds of thawing, but the frequency of the main lymphocyte subsets was stable across the three thawings. Nevertheless, we observed a significant reduction of B cell frequency in frozen samples compared to fresh ones. On repeated thawings and subsequent conventional stimulation, lymphocyte proliferation significantly decreased, and IL-10, IL-6, GM-CSF, IFN-gamma, and IL-8 showed a trend to lower values. 相似文献
38.
Ciro Del Vecchio Marco Di Ludovico Alberto Balsamo Andrea Prota Edoardo Cosenza 《Structural Concrete》2019,20(3):1168-1181
Poor‐quality concrete and a lack of transverse reinforcement commonly characterize the reinforced concrete (RC) structures built during the past century in the Mediterranean area. However, very few experiments have investigated the performance of structural members of that kind. Moreover, the design of repair and retrofit solutions using available techniques could be challenging due to the weakness of the concrete substrate. This paper reports on the experimental response and the repair and retrofit of existing RC columns with poor‐quality concrete. In particular, it presents and discusses the outcomes of three tests on two RC columns extracted from a real building that was severely damaged by the 2009 L'Aquila earthquake and was, as a result, demolished. The concrete compressive strengths resulting from in situ and laboratory material characterization tests are used to predict the axial strength of the sampled columns. An innovative application of fiber‐reinforced cement composites (FRCC) for the repair and retrofit of damaged columns is proposed and validated experimentally. The results reveal that this material is effective when it comes to recovering and improving the axial capacity of damaged RC members. Practical suggestions to account for the confinement effect of the thin FRCC jacketing in available analytical formulations are discussed. 相似文献
39.
Creep-fatigue assessment procedures for the design of high-temperature components should ensure lifetime predictions which are safe but not excessively conservative. Adoption of more accurate assessment procedures than are presently available enable the availability of power plant with greater operating flexibility. Operating flexibility is becoming a key market driver due to the increased interest in the use of intermittent renewable energy sources (e.g. wind, solar) which place focus on a requirement for turbo-machinery to be capable of reduced start-up and shut-down times. This study introduces a creep-fatigue assessment procedure for the design of high-temperature components required for flexible operation. In particular, it considers alloys with high creep-fatigue deformation/damage interaction characteristics such as the advanced martensitic 9–11%Cr steels which are widely used for power plant applications. The procedure takes advantages of advanced constitutive models and implements them in a state-of-the-art mechanical assessment procedure for calculating high-temperature component life times. 相似文献
40.
Edoardo Capuano 《Critical reviews in food science and nutrition》2017,57(16):3543-3564
A diet rich in dietary fiber (DF) is considered healthy and recommended dietary intake of DF is established all over the world. The physiological effect of DF is mostly related to its behavior during digestion. In this review, the behavior of DF in the human digestive tract is discussed and linked to its physiological effect with special attention to four aspects of such behavior: (i) the modulation of bioavailability by the plant cell walls, (ii) the effect of DF on the rheological and colloidal state of digesta, (iii) the binding of DF with phenolic compounds, bile salts, mineral ions, and digestive enzymes, and (iv) DF fermentation in the large intestine and the corresponding effect on microbiota composition. It is stressed that the detailed chemical characterization of DF is crucial to explain its effect on health and that DF behavior in the digestive tract can be modulated by interactions with other food and meal components so that information of the bare content in DF of food is not sufficient to predict its physiological effect. 相似文献