150 research outputs found
The Venetian Ghetto : Semantic Modelling for an Integrated Analysis
In the digital era, historians are embracing information technology as a research tool. New technologies offer investigation and interpretation, synthesis and communication tools that are more effective than the more traditional study methods, as they guarantee a multidisciplinary approach and analyses integration. Among the available technologies the best suited for the study or urban phenomena are databases (DB), the Geographic Information System (GIS), the Building Information Modelling (BIM) and the multimedia tools (Video, APP) for the dissemination of results.
The case study described here concerns the analysis of part of Venice that changed its appearance from 1516 onwards, with the creation of the Jewish Ghetto. This was an event that would have repercussions throughout Europe, changing the course of history. Our research confirms that the exclusive use of one of the systems mentioned above (DB, GIS, BIM) makes it possible to manage the complexity of the subject matter only partially. Consequently, it became necessary to analyse the possible interactions between such tools, so as to create a link between an alphanumeric DB and a geographical DB. The use of only GIS and BIM that provide for a 4D time management of objects turned out to be able to manage information and geometry in an effective and scalable way, providing a starting point for the mapping in depth of the historical analysis. Software products for digital modelling have changed in nature over time, going from simple viewing tools to simulation tools.
The reconstruction of the time phases of the three Ghettos (Nuovo, Vecchio, and Nuovissimo) and their visualisation through digital narratives of the history of that specific area of the city, for instance through videos, is making it possible for an increasing number of scholars and the general public to access the results of the study
KNOWLEDGE PROCESS MANAGEMENT AND BIM PLATFORM-BASED SOLUTION FOR THE RECONSTRUCTION OF THE GERMAN OPERA HOUSE BUILDING
This article addresses the challenge of reconstructing demolished historical buildings in digital humanities, focusing on the German Opera House Building by Louis Sullivan and Dankmar Adler and emphasizing effective information acquisition and management. Despite the benefits of digitization, knowledge management remains a persistent obstacle. The proposed multidisciplinary approach utilizes Building Information Modeling (BIM) and Common Data Environment (CDE) to seamlessly integrate data from diverse sources, supporting collaboration and ensuring result consistency. This contextualized BIM-based system transforms the reconstruction of non-existent historical buildings, overcoming challenges such as non-uniqueness of historical documents and fragmented knowledge. Results highlight the methodology's effectiveness in digitally reconstructing historical buildings and improving knowledge sharing for the examined property
Zero-Knowledge Proofs from the Action Subgraph
In this work, we investigate techniques to amplify the soundness of zero-knowledge proofs of knowledge for cryptographic group actions. We explore the use of a particular graph generated from the group action of random element and provide a fully general protocol with only minimal assumptions on the group action properties. This technique can be seen also as generalization of MPC-in-the-head approach for the context of (non-abelian) group actions.
We show that a straightforward translation of the paradigm is unlikely to provide a practical improvement over the simpler construction of a 3-pass Sigma protocol. We then describe a novel approach and show that it yields a computational advantage, therefore laying the ground for new, efficient protocols
Structure-dependent electrical properties of graphene nanoribbon devices with graphene electrodes
Graphene nanoribbons (GNRs) are a novel and intriguing class of materials in
the field of nanoelectronics, since their properties, solely defined by their
width and edge type, are controllable with high precision directly from
synthesis. Here we study the correlation between the GNR structure and the
corresponding device electrical properties. We investigated a series of field
effect devices consisting of a film of armchair GNRs with different structures
(namely width and/or length) as the transistor channel, contacted with narrowly
spaced graphene sheets as the source-drain electrodes. By analyzing several
tens of junctions for each individual GNR type, we observe that the values of
the output current display a width-dependent behavior, indicating electronic
bandgaps in good agreement with the predicted theoretical values. These results
provide insights into the link between the ribbon structure and the device
properties, which are fundamental for the development of GNR-based electronics.Comment: Published in Carbon (2019
Vegetable intercropping in a small-scale aquaponic system
This paper reports the results of the first study of an aquaponic system for Pangasianodon hypophthalmus production that uses Lactuca sativa L. (lettuce) and Cichorium intybus L. rubifolium group (red chicory) intercropping in the hydroponic section. The experiment was conducted in a greenhouse at the Zurich University of Applied Sciences, W\ue4denswil, Switzerland, using nine small-scale aquaponic systems (each approximately 400 L), with the nutrient film technique (NFT). The intercropping of vegetables did not influence the water temperature, pH, electric conductivity (EC), oxidation\u2013reduction potential, nor O2 content. Intercropping with red chicory increased the lettuce sugar content (+16.0% and +25.3% for glucose and fructose, respectively) and reduced the lettuce caffeic acid content ( 1216.8%). In regards to bitter taste compounds (sesquiterpene lactones), intercropping reduced the concentrations of dihydro-lactucopicrin + lactucopicrin ( 1242.0%) in lettuce, and dihydro-lactucopicrin + lactucopicrin ( 1222.0%) and 8-deoxy\u2013lactucin + dihydro-lactucopicrin oxalate ( 1218.7%) in red chicory, whereas dihydro-lactucin content increased (+40.6%) in red chicory in regards to monoculture. A significantly higher organic nitrogen content was found in the lettuce (3.9%) than in the red chicory biomass (3.4%), following the intercropping treatment. Anion and cation contents in vegetables were affected by species (Cl 12, NO3 12, PO43 12, SO42 12, and Ca2+), intercropping (K+ and Mg2+), and species
7 intercropping interactions (NO2 12 and NH4+). Experimental treatments (monoculture vs intercropping and distance from NFT inlet) did not exert significant effects on leaf SPAD (index of relative chlorophyll content) values, whereas the red coloration of the plants increased from the inlet to the outlet of the NFT channel. Intercropping of lettuce and red chicory affected the typical taste of these vegetables by increasing the sweetness of lettuce and changing the ratio among bitter taste compounds in red chicory. These results suggest intercropping as a possible solution for improving vegetable quality in aquaponics. Although the results are interesting, they have been obtained in a relatively short period, thus investigations for longer periods are necessary to confirm these findings. Further studies are also needed to corroborate the positive effect of the presence of red chicory in the system on fish production parameters
Farming largemouth bass (Micropterus salmoides) with lettuce (Lactuca sativa) and radicchio (Cichorium intybus) in aquaponics: effects of stocking density on fish growth and quality, and vegetable production
Submitted 2020-06-30 | Accepted 2020-09-01 | Available 2020-12-01https://doi.org/10.15414/afz.2020.23.mi-fpap.79-87The present study assessed the effects of two initial stocking densities (low â LD, 4.23 kg m-3, moderate â MD, 8.05 kg m-3) on growth, health and fillet quality of largemouth bass (Micropterus salmoides), and on yield of lettuce (Lactuca sativa) and radicchio (Cichorium intybus group Rubifolium) produced in a low-tech recirculating aquaponic system. A total of 104 largemouth bass (initial body weight: 236 ± 38 g) were randomly stocked in eight 500 L tanks (four per stocking density) and monitored during a 70-day period. Vegetables yield was similar in LD and MD groups. Lettuce yield (6.33 kg m-2) was in line with typical values, whereas radicchio showed a negligible yield (1.34 kg m-2). Likewise, fish final weight (263 g, on average), specific growth rate (0.17% d-1), feed conversion ratio (2.72), and mortality (4.8%) did not differ between treatments. Fish morphometric indices, slaughter results and fillet quality were not affected by stocking density. In conclusion, the production of lettuce was successful in the tested system, whereas the production of radicchio did not achieve satisfactory results. Growth performances of the largemouth bass were poor and further investigations are required to optimize the rearing of this fish species in low-tech aquaponic systems.Keywords: largemouth bass, lettuce, radicchio, water quality, flesh qualityReferencesBAĂMANN, B. et al. (2017). Stress and welfare of African catfish (Clarias gariepinus Burchell, 1822) in a coupled aquaponic system. Water, 9(7), 504. https://doi.org/10.3390/w9070504BROWN, T. G. et al. (2009). Biological synopsis of largemouth bass (Micropterus salmoides). Canadian Manuscript Report of Fisheries and Aquatic Sciences, 2884, v + 27 p.CHAVES-POZO, E. et al. (2019). An overview of the reproductive cycle of cultured specimens of a potential candidate for Mediterranean aquaculture, Umbrina cirrosa. Aquaculture, 505, 137â149. https://doi.org/10.1016/j.aquaculture.2019.02.039CHEN, Y. et al. (2020). Effects of dietary fish oil replacement by soybean oil and L-carnitine supplementation on growth performance, fatty acid composition, lipid metabolism and liver health of juvenile largemouth bass, Micropterus salmoides. Aquaculture, 516, 734596. https://doi.org/10.1016/j.aquaculture.2019.734596PANTANELLA, E. et al. (2012). Aquaponics vs. hydroponics: production and quality of lettuce crop. Acta Horticulturae, 927, 887-893. https://doi.org/10.17660/ActaHortic.2012.927.109RAHMAN, M. M (2015). Role of common carp (Cyprinus carpio) in aquaculture production systems. Frontiers in Life Science, 8(4), 399â410. https://doi.org/10.1080/21553769.2015.1045629RAKOCY, J. E. (2012). Aquaponics: integrating fish and plant culture. In: Tidwell J.H. (Ed), Aquaculture production systems. India: Wiley-Blackwell (pp. 343â386). https://doi.org/10.1002/9781118250105.ch14SAS (Statistical Analysis System). 2013. SAS/STAT(R) 9.2 Userâs Guide, second ed. SAS Institute Inc., Cary, NC, USA. Retrieved May 10, 2020 from http://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#glm_toc.htmSOMERVILLE, C. et al. (2014). Small-scale aquaponic food production. Integrated fish and plant farming. Rome: FAO Fisheries and Aquaculture Technical Paper No. 589. Retrieved May 15, 2020 from http://www.fao.org/3/a-i4021e.pdfSUĂREZ, M. D. et al. (2014). Influence of dietary lipids and culture density on rainbow trout (Oncorhynchus mykiss) flesh composition and quality parameter. Aquaculture Engineering, 63, 16â24. http://dx.doi.org/10.1016/j.aquaeng.2014.09.001SUN, J.-L. et al. (2020). Interactive effect of thermal and hypoxia on largemouth bass (Micropterus salmoides) gill and liver: Aggravation of oxidative stress, inhibition of immunity and promotion of cell apoptosis. Fish & Shellfish Immunology, 98, 923â936. https://doi.org/10.1016/j.fsi.2019.11.056TIDWELL, J. H. et al. (2000). Species profile â Largemouth bass. Southern Regional Aquaculture Center 722. Retrieved May 20, 2020 from http://aquaculture.ca.uky.edu/aquaculture-publications/12TIDWELL, J. H. et al. (2007). Effect of stocking density on growth and water quality for largemouth bass Micropterus salmoides growout in ponds. Journal of the World Aquaculture Society, 29, 79â83. https://doi.org/10.1111/j.1749-7345.1998.tb00302.xTYSON, R. V. et al. (2004). Reconciling water quality parameters impacting nitrification in aquaponics: the pH levels. In: Proceedings of the Florida State Horticultural Society 117, 79â83. Retrieved May 20, 2020 from https://journals.flvc.org/fshs/article/view/858557_11VITULE, J. R. S. et al. (2006). Introduction of the African catfish Clarias gariepinus (Burchell, 1822) into Southern Brazil. Biological Invasions, 8, 677â681. https://doi.org/10.1007/s10530-005-2535-8WANG, Y. et al. (2019). Effect of stocking density on growth, serum biochemical parameters, digestive enzymes activity and antioxidant status of largemouth bass, Micropterus salmoides. Pakistan Journal of Zoology, 51(4), 1509â1517. http://dx.doi.org/10.17582/journal.pjz/2019.51.4.1509.1517WATTS, C. et al. (2016). Evaluation of stocking density during secondâyear growth of largemouth bass, Micropterus salmoides, raised indoors in a recirculating aquaculture system. Journal of the World Aquaculture Society, 47(4), 538â543. https://doi.org/10.1111/jwas.12315YILDIZ, H. Y. et al. (2017). Fish welfare in aquaponic systems: its relation to water quality with an emphasis on feed and faecesâA review. Water, 9(1), 13. https://doi.org/10.3390/w9010013YUAN, J. et al. (2019). Analysis of the growth performances, muscle quality, blood biochemistry and antioxidant status of Micropterus salmoides farmed in in-pond raceway systems versus usual-pond systems. Aquaculture, 511, 734241. https://doi.org/10.1016/j.aquaculture.2019.734241
Insights about the Choice of Pig Manure Processing System in Three Italian Regions: Piemonte, Friuli Venezia Giulia, and Veneto
The adoption of best available technologies (BATs) by the livestock sector has a fundamental role in developing a sustainable agricultural system. Italy is the EU member with the highest percentage of manure treated, but processing facilities are regionally scattered and the adoption of BATs is far from being scaled-up. The adoption is a matter of multicriteria decision-making and full knowledge on how to foster the transition is still lacking. The present research aims to deepen the available knowledge by analysing the perception of 40 pig farm managers about decision criteria behind the adopted manure management system across three different Italian regions. We assessed farms in Piemonte, Friuli Venezia Giulia, and Veneto. All farms have adequate storage facilities, but 82.5% adopt no processing technique. The two most important decision criteria are economic, i.e., the minimization of treatment and spreading costs. The emerging picture allows us to conclude that BAT adoption is still adopted as a mere consequence of legal obligation. Economic constraints prevail as there is a lack of information and uncertainty. Clear perspectives and recognition of virtuous behavior prevent farmers from making decisions based on environmental or social criteria. Therefore, effective policies oriented to fill these gaps are needed to accelerate the transition towards sustainability
Hydroponic systems and water management in aquaponics : a review
Aquaponics (AP), the integrated multi-trophic fish and plants production in quasi-closed recirculating system, is one of the newest sustainable food production systems. The hydroponic component of the AP directly influences water quality (in turn influencing fish growth and health), and water consumption (through evapotranspiration) of the entire system. In order to assess the role of the design and the management of the hydroponic component on the overall performance, and water consumption of the aquaponics, 122 papers published from 1979 to 2017 were reviewed. Although no unequivocal results were found, the nutrient film technique appears in several aspects less efficient than medium-based or floating raft hydroponics. The best system performance in terms of fish and plant growth, and the highest nutrient removal from water was achieved at water flow between 0.8 L minâ1 and 8.0 L minâ1. Data on water consumption of aquaponics are scarce, and no correlation between the ratio of hydroponic unit surface/fish tank volume and the system water loss was found. However, daily water loss was positively correlated with the hydroponic surface/fish tank volume ratio if the same experimental conditions and/or systems were compared. The plant species grown in hydroponics influenced the daily water loss in aquaponics, whereas no effect was exerted by the water flow (reciprocating flood/drain cycle or constant flow) or type (medium-based, floating or nutrient film technique) of hydroponics
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