Microtextural and microchemical studies of hydraulic ancient mortars: Two analytical approaches to understand pre-industrial technology processes     

Maria Pia Riccardi  Marco Lezzerini  Federico Car  Marco Franzini  Bruno Messiga 《Journal of Cultural Heritage》2007,8(4):350-360

Two different analytical approaches have been taken into account to investigate the role of Si-rich phases in enhance hydraulic reactions of bedding mortar mixtures from San Lorenzo Church in Milan (Northern Italy) and from the Medicean Aqueduct in Pisa (Central Italy). In the first case, mortars show clear hydraulic type reactions in the form of coronal layers between the reacting additive and the binder mass. In the second one, the hydraulic reactions do not develop visible mineral phases and processes have been inferred from chemical, mineralogical analyses and mass balance calculation. The microstructural studies not always are sufficient to understand the complex dynamics of reaction attained during pre-industrial manufacturing processing of mortars and related binders. In fact, if the reacting raw materials are fine-grained and/or have remarkable chemical reactivity, no relicts are preserved by mortar microtextures.  相似文献   

Cognitive styles,abilities, and aptitudes: Are they dependent or independent?     

Pat-Anthony Federico  David B. Landis 《Contemporary educational psychology》1984,9(2):146-161

An important question that must be answered is whether cognitive styles, abilities, and aptitudes provide complementary or redundant information regarding students' characteristics. Measures of 6 styles, 6 abilities, and 12 aptitudes were administered to 201 Navy recruits. Relationships among all cognitive attributes and between sets of styles and abilities as well as styles and aptitudes were examined by computing product-moment correlations and two canonical analyses. A principal-factor analysis and varimax rotation were also computed for all 24 characteristics. The results indicated that many styles are significantly related to abilities and aptitudes. However, the amount of shared variance between styles and abilities or aptitudes is small. Three significant factors were extracted (i.e., technical aptitude, verbal ability, and general problem solving) which underlie much of the variability of these cognitive characteristics. The data demonstrated (1) the relative dependence of most cognitive styles with abilities and aptitudes inherent to general problem solving, and (2) the relative independence of some cognitive styles from technical aptitude and verbal ability dimensions.  相似文献   

实际塑性铰链位置对延性框架行为的影响     

M assimiliano FRALDI Antonio GESUALDO Federico GUARRACINO 《浙江大学学报(A卷英文版)》2014,15(7):482-495

研究目的：研究方法：通过有限元分析和极限分析,研究了在纵向和横向载荷下钢框架的最大负荷和坍塌模式,并考虑了塑性铰链住轴向力和弯曲力矩的作用下住实际旋转时的运动学。在垂直和水平方向载荷共存的情况下,基于轴向力和弯曲力矩的交互作用,研究延性框架的极限载荷和坍塌模式对产生于塑性铰链的真实运动学的敏感性。通过两个基本的案例和通过成功地评估非线性有限元分析和直接实施的极限分析步骤,并利用MATHEMATICA,揭示了其敏感性。 在标准规程的框架下,即使在最简单的案例中,极限分析的主要结果也会考虑在坍塌时的运动学,这与设计和加固的目的都是相关的。如果没有对所有的结构元件的轴向力和弯曲力矩的交互作用进行合理的计算,塑性铰链的定位计算可能得出不正确的坍塌机理和误导性的安全系数。就具体方面而言,本文清楚地表明,在设计新的结构或者为现有结构进行加固时,即使是使用看起来已经非常完备的经典步骤,也必须非常小心。本文的模型可以为处理规程设计的执业工程师和标准化委员会提供参考。  相似文献   

The impact of public funding on science valorisation: an analysis of the ERC Proof-of-Concept Programme     

Federico Munari  Laura Toschi 《Research Policy》2021,50(6):104211

Governments and public agencies are increasingly keen to support the translation of scientific discoveries into commercial and societal applications through science valorisation funding, as a way to enhance progress and inclusive growth. In this paper, we use grant-level data from the European Research Council Proof-of-Concept (PoC) programme, in order to assess the impact of public funding on a broad set of science valorisation outcomes, including licensing, spinoff formation, R&D collaborations, consulting and access to follow-on funding. We employ an instrumental variable approach to compare the valorisation outcomes of projects that obtained an ERC PoC grant to a group of projects that applied to the PoC scheme but were not funded. We find that the programme was effective in fostering the early valorisation of scientific discoveries by all measures of success that we employed. Overall, thus, our findings speak in favour of this type of policy instrument as a catalyst to accelerate the transition of scientific breakthroughs towards practical applications.  相似文献   

Inequality of Opportunity in Tertiary Education: Evidence from Europe     

Palmisano  Flaviana  Biagi  Federico  Peragine  Vito 《Research in higher education》2022,63(3):514-565

Research in Higher Education - This study provides comparable lower-bound estimates of inequality of opportunity for tertiary education (EIOp) for 31 countries in Europe, by using the two EU-SILC...  相似文献   

International patent disputes: Evidence from oppositions at the European Patent Office     

Federico Caviggioli  Giuseppe ScellatoElisa Ughetto 《Research Policy》2013

The impact of the geographical origin of patents on the probability of an opposition being filed and a patent being revoked has been examined in this paper, after accounting for patent value indicators and industry specificities. The study is based on a dataset of approximately 450,000 EPO granted patents and 24,000 patent opposition cases in the years 2000–2008. We find that patents with a first priority in the US are less likely to be challenged, although they are relatively more likely to be revoked than patents with a priority in a member country of the European Patent Convention. Patents from Japan have less probability of being opposed and are less likely to be revoked than the other countries. A disaggregation of the European countries has revealed that patents with a German priority have a higher or similar likelihood of being opposed than patents from the other countries, with the exceptions of The Netherlands and Denmark.  相似文献   

An unexpected world population variation of MCT1 polymorphism 1470T > A involved in lactate transport     

Federico Onali  Carla M. Calò  Myosotis Massidda  Miguel M. Álvarez-Álvarez 《European Journal of Sport Science》2018,18(10):1376-1382

A common missense mutation (1470T > A) in gene SLC16A1 responsible for an amino acid substitution in protein MCT1 has been associated with differential lactate transport and hence, differences in physical performance and muscle injuries in relation to physical exercise. This study describes, for the first time, the worldwide variation of MCT1 variant 1470T > A at an intra- and inter-continental level. Two thousand five hundred and four individual genotypes of 26 populations clustered in 5 population groups have been analysed with data downloaded from the public database 1000 Genomes Phase 3 Browser. Several parameters of population differentiation and structure have been explored as well as selection signatures in the whole gene. Allele T, the common variant, shows extremely high values in Sub-Saharan African groups (frequencies 86–91%) as compared with the remaining world regions (69–49%). TT genotype also predominates in African groups, showing significant differences with the rest of world populations. In view of the evidence that the TT genotype is associated with clinical implications and a better predisposition to sprint/power performances, we suggest that the high presence of the TT genotype in African populations should be taken into account in future association studies at both medical and sports fields.  相似文献   

Physiological and anthropometric characteristics of top-level youth cross-country cyclists     

Alessandro Fornasiero  Aldo Savoldelli  Roberto Modena  Gennaro Boccia  Barbara Pellegrini  Federico Schena 《Journal of sports sciences》2018,36(8):901-906

In the literature there is a lack of data about the development of top level athletes in cross-country mountain biking (XCO). The purpose of this study was to analyze anthropometric and physiological characteristics of some of the best XCO bikers aged between 13 and 16. The study involved 45 bikers (26 males and 19 females) belonging to a youth national team. The evaluations, consisting of anthropometric measures, incremental cycling tests (VO_2max, PPO, P@RCP), and 30 s Wingate Tests (PMax, PMean), were conducted over a lapse of 4 years. Our findings showed in bikers, already at young age, a specific athletic profile advantageous for XCO performance. At the age of 16, just before entering the junior category and competing at international level, male and female bikers showed physiological values normalized to the body mass comparable to those reported in literature for high level athletes (VO_2max>70 and >60 ml/kg/min, PPO >6.5 and >5.5 W/kg, respectively in males and females). The production of high power-to-weight ratios and high peaks of anaerobic power attests the presence of highly developed aerobic and anaerobic systems in young XCO cyclists reflecting the high physiological demand of this sport.  相似文献   

Teaching Flowers: A Photo Essay     

Federico Hewson 《Teaching Artist Journal》2017,15(1):9-16

“Teaching Flowers” reflects on humanity's deep connections to horticulture by gathering varied thoughts from seminal writers in the field. In addition, this visual article draws attention to labor issues within the U.S. floral industry by documenting the author's exploration of flowers as social sculpture in New York City.  相似文献   

Art collections and taste in the Spanish <Emphasis Type="Italic">Siglo</Emphasis><Emphasis Type="Italic">de Oro</Emphasis>     

Federico Etro  Elena Stepanova 《Journal of Cultural Economics》2017,41(3):309-335

We analyze art pricing in a unique dataset on Madrid inventories between 1600 and 1750. We estimate a price index for the Spanish art market that is used for a general historical analysis of art during this period, showing a large increase in the real price of paintings during the XVII century. Then we examine the price differential between domestic and foreign paintings: At the beginning of the century domestic production was priced substantially below imported paintings, but the price gap was gradually reduced during the century. We argue that such a price convergence was not the fruit of variations in real exchange rate, relative supply or home bias, but was associated with increasing prices for the new domestic painters of the XVII century. Increasing remuneration for painting may have induced artistic innovations by domestic producers and created the conditions for the development of the Siglo de Oro of Spanish art.  相似文献