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Статті в журналах з теми "Passiti wines"
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Liu, Ruojin, Yaran Liu, Yuxuan Zhu, Maaria Kortesniemi, Baoqing Zhu, and Hehe Li. "Aromatic Characteristics of Passion Fruit Wines Measured by E-Nose, GC-Quadrupole MS, GC-Orbitrap-MS and Sensory Evaluation." Foods 11, no. 23 (November 24, 2022): 3789. http://dx.doi.org/10.3390/foods11233789.
Повний текст джерелаАнотація:
This study investigated the volatile composition and aromatic features of passion fruit wines using a combination of gas chromatography–quadrupole mass spectrometry (GC-qMS), gas chromatography–Orbitrap–mass spectrometry (GC-Orbitrap-MS), electronic nose (E-nose) and sensory evaluation. The results showed that these passion fruit wines possessed different aromatic features confirmed by E-nose. Seventeen sulfur compounds and seventy-eight volatiles were detected in these passion fruit wines using GC-Orbitrap-MS and GC-qMS, respectively. Forty-four volatiles significantly contributed to the overall wine aroma. These wines possessed passion fruit, mango, green apple, lemon and floral aromas confirmed by sensory evaluation. The partial least squares regression analysis indicated that sulfides, esters and terpenes, and terpenes mainly correlated to the passion fruit, mango and green apple aroma, respectively. Sulfur compounds significantly affected the aroma of passion fruit wine. The findings in this study could provide useful insight toward the quality control of passion fruit wine.
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Giordano, Manuela, Luca Rolle, Giuseppe Zeppa, and Vincenzo Gerbi. "Chemical and volatile composition of three italian sweet white Passito wines." OENO One 43, no. 3 (September 30, 2009): 159. http://dx.doi.org/10.20870/oeno-one.2009.43.3.796.
Повний текст джерелаАнотація:
<p style="text-align: justify;"><strong>Aims</strong>: This study was designed to gain knowledge of three Controlled Denomination of Origin (DOC) Italian sweet white Passito wines (Caluso Passito DOC, Cinque Terre Sciacchetrà DOC and Passito di Pantelleria DOC) produced in several areas of Italy from grapes dried with different systems and vinification techniques.</p><p style="text-align: justify;"><strong>Methods and results</strong>: Physico-chemical and chromatic characteristics, sodium, potassium, gluconic acid, glucono-γ-lactone, acetaldehyde, sorbitol, laccase, organic acids and semi-quantitative free volatile profile were determined on these wines. Caluso Passito DOC wines presented higher contents of organic acids (above all, malic acid), main metabolites from noble Botrytis cinerea (laccase, glycerol, gluconic acid and benzaldehyde) and low contents of total polyphenols. Among the volatile components, normal fatty acid ethyl esters (ethyl hexanoate and ethyl octanoate), branched-chain esters (ethyl 2-methylpropanoate, ethyl 2-methylbutyrate, ethyl 3-methylbutyrate) and benzaldeyde characterized this Passito wine. Cinque Terre Sciacchetrà DOC wines showed the lowest total acidity with a lower amount of malic acid and a higher content of polyphenols. This wine was characterized by some predominant acetates (isoamyl acetate), alcohols, benzaldehyde and an isoprenoid, ß-damascenone. Passito di Pantelleria DOC wines presented higher amounts of ashes resulting in higher pH values compared to the other two Passito typologies. Due to its production from aromatic grapes, it showed several varietal components such as terpenes, while ethyl esters/acetates and alcohols were less represented.</p><p style="text-align: justify;"><strong>Conclusion</strong>: This survey provides information allowing the characterisation of three Passito dessert wines at high commercial value.</p><p style="text-align: justify;"><strong>Significance and impact of the study</strong>: This study provides oenological information to be utilised to protect and valorise the Controlled Denomination of Origin sweet wine production and contributes to the preservation of traditional and terroir productions and their commercialization.</p>
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Kowalczyk, Barbara, Monika Bieniasz, and Anna Kostecka-Gugała. "The Content of Selected Bioactive Compounds in Wines Produced from Dehydrated Grapes of the Hybrid Variety ‘Hibernal’ as a Factor Determining the Method of Producing Straw Wines." Foods 11, no. 7 (April 1, 2022): 1027. http://dx.doi.org/10.3390/foods11071027.
Повний текст джерелаАнотація:
Sweet wines are appreciated worldwide; many are produced by fermenting the must of dehydrated (semi-dried) grapes, using methods that vary from region to region. The aim of this study was to evaluate the basic chemical and oenological characteristics of wines obtained by three technologies of production. The wines were made from a hybrid cultivar ‘Hibernal’, grown under cool climate conditions. ‘Hibernal’ is a hybrid variety. This ‘Hibernal’ variety is widely cultivated in central and eastern Europe, where it is of great economic importance. Wines produced from this variety are popular in local markets. In comparison with the production of varieties belonging to Vitis vinifera, a very small percentage of the ‘Hibernal’ variety is cultivated. The methods used in the experiment for the production of wines were: classical method in the Italian passito style, modification of the passito style with a seven-day maceration of grapes, and a method of production in the Tokaj wine style at five Puttonyos. Basic chemical parameters, acid profile, total phenolic content, antioxidant and antiradical capacities, and quantitative analysis of selected polyphenols was performed. The sensory features and quality of the wines was assessed using a sommelier analysis based on The Wine & Spirit Education Trust guidelines. The results indicated that the seven-day maceration of the dehydrated grapes resulted in the highest polyphenol content, as well as the largest antioxidant and antiradical contents. The oenological evaluation of wines produced by the Tokaj method and Italian passito method with seven-day maceration found that the wines were appreciated due to their rich taste, flavor, and overall quality. The present study confirms the promising opportunities to obtain special sweet wine with a valuable composition and oenological characteristics in regions with cooler climates.
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Van Rooyen, Rianco, Jeanne Brand, and Wessel Du Toit. "Varietal thiols levels and sensory effects in South African Colombard wines." OENO One 57, no. 1 (January 5, 2023): 33–40. http://dx.doi.org/10.20870/oeno-one.2023.57.1.7121.
Повний текст джерелаАнотація:
The levels of varietal thiols and the role these compounds play in Colombard wine have not been investigated in detail. This study assessed the levels of the varietal thiols 4-methyl-4-sulfanylpentan-2-one (4MSP), 3-sulfanylhexyl acetate (3SHA) and 3-sulfanylhexan-1-ol (3SH) and their sensory effects in 24 young South African Colombard wines. Levels of 3SHA and 3SH were, in general, in line with those previously reported in South African Chenin blanc and Sauvignon blanc wines. Levels of 4MSP were, in general, found at a narrower range than those reported for Sauvignon blanc wines. Twelve of these wines were also sensorially analysed by a panel of wine industry experts. Aroma descriptors, such as guava, passion fruit, sweat and tomato leaf, which have previously been linked to 3SH and 3SHA, were also found, especially in the wines containing higher levels of these two compounds. Good correlations between 3SHA and sweat and guava were found. This study contributes to the knowledge of varietal thiol levels and their role played in 24 Colombard white wines. It could also lead to wine producers adapting their winemaking g practices to increase levels of varietal thiols if the aroma characteristics linked to these compounds are sought after in this single cultivar wine.
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Sanmartin, Chiara, Margherita Modesti, Francesca Venturi, Stefano Brizzolara, Fabio Mencarelli, and Andrea Bellincontro. "Postharvest Water Loss of Wine Grape: When, What and Why." Metabolites 11, no. 5 (May 14, 2021): 318. http://dx.doi.org/10.3390/metabo11050318.
Повний текст джерелаАнотація:
In postharvest science, water loss is always considered a negative factor threatening fruit and vegetable quality, but in the wine field, this physical process is employed to provide high-quality wine, such as Amarone and Passito wines. The main reason for this is the significant metabolic changes occurring during wine grape water loss, changes that are highly dependent on the specific water loss rate and level, as well as the ambient conditions under which grapes are kept to achieve dehydration. In this review, hints on the main techniques used to induce postharvest wine grape water loss and information on the most important metabolic changes occurring in grape berries during water loss are reported. The quality of wines produced from dried/dehydrated/withered grapes is also discussed, together with an update on the application of innovative non-destructive techniques in the wine sector. A wide survey of the scientific papers published all over the world on the topic has been carried out.
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Simonato, Barbara, Marilinda Lorenzini, Michela Cipriani, Fabio Finato, and Giacomo Zapparoli. "Correlating Noble Rot Infection of Garganega Withered Grapes with Key Molecules and Odorants of Botrytized Passito Wine." Foods 8, no. 12 (December 4, 2019): 642. http://dx.doi.org/10.3390/foods8120642.
Повний текст джерелаАнотація:
Experimental passito wines with different percentages of naturally noble-rotten grapes of the Garganega variety were analyzed to evaluate key molecules and odorants related to the typical aroma and sensory profile of botrytized passito wine. Remarkable changes in the concentration of 1-octen-3-ol, 4-terpineol, benzaldehyde, N-(3-methylbutyl)acetamide, and sherry lactone 1 and 2 were observed between sound and noble-rotten wines. Wines were perceived to be different for floral, honey, figs, apricot, and caramel scents. By partial least square regression these descriptors were well correlated to samples. An important positive contribution of sherry lactones, N-(3-methylbutyl)acetamide, vanillin, benzaldehyde, and γ-butyrolactone to honey, apricot, and caramel was observed. It is conceivable that oxidative effects of Botrytis cinerea infection play an important role in the genesis of these chemical and sensory aroma markers. This study provides a predictive tool for winemakers that use natural grape withering to produce wines whose aroma profile is not standardized due to the seasonal variation of noble rot incidence.
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Teil, Geneviève. "Amateurs’ Exploration of Wine: A Pragmatic Study of Taste." Theory, Culture & Society 38, no. 5 (August 3, 2021): 137–57. http://dx.doi.org/10.1177/02632764211029347.
Повний текст джерелаАнотація:
Amateurs are neither regular consumers nor professionals. What makes them distinctive? To answer that question, this ethnographic study focuses on wine amateurs who show a distinctive feature compared to regular consumers: for them, wine is not a straightforward reality but a world to explore. Wine exploration drives an evolution that transforms both wine and amateurs’ disposition towards it. Amateurs usually start with the discovery of the wines and their tastes, which may turn into an ability to attune to and finally produce taste and good quality. Amateurs’ passion, initially fuelled by the discovery of unknown tastes, is then informed by the renewal of the taste experience itself. Following amateurs in their exploratory activity allows us to extend the analysis beyond scholars’ usual focus on one of its particularly normative stages, and to propose a renewed account of the amateur that is quite remote from the standard image of the ‘cultural prescriber’.
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Dini, Irene, Ritamaria Di Lorenzo, Antonello Senatore, Daniele Coppola, and Sonia Laneri. "Comparison between Mid-Infrared (ATR-FTIR) Spectroscopy and Official Analysis Methods for Determination of the Concentrations of Alcohol, SO2, and Total Acids in Wine." Separations 8, no. 10 (October 17, 2021): 191. http://dx.doi.org/10.3390/separations8100191.
Повний текст джерелаАнотація:
The determination of alcohol, SO2, and total acids in wine through conventional laboratory techniques have some limitations related to the amount of the samples, analytical preparation of laboratory staff, and time to carry out the analysis. In recent years, spectroscopic and chromatographic methods have been proposed to determinate simultaneously multiple analytical parameters. The new methods claim the speed of analysis and easy execution. However, they need a validation process that guarantees the reliability of the results to be used in official determinations. This study aimed to evaluate the usefulness of FT-infrared reflectance (FT-IR) to quantify total acid, alcohol, and SO2 concentration in the wines. For this purpose, 156 DOC Italian wines were tested with IR technology, and results were compared to those obtained by official analysis methods. The comparison was performed using two non-parametric statistical methods: the Bland & Altman test and Passing & Bablok regression. Our results showed that the spectrophotometric methods make errors due to interfering contaminants in the sample that can be corrected by blank determination. Therefore, the spectrophotometric methods that use the infrared region of the electromagnetic spectrum can be used by the wine industry and regulators for the wine routine as an alternative to official methodologies.
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Basa, Kalliopi, Seraphim Papanikolaou, Maria Dimopoulou, Antonia Terpou, Stamatina Kallithraka, and George-John E. Nychas. "Trials of Commercial- and Wild-Type Saccharomyces cerevisiae Strains under Aerobic and Microaerophilic/Anaerobic Conditions: Ethanol Production and Must Fermentation from Grapes of Santorini (Greece) Native Varieties." Fermentation 8, no. 6 (May 26, 2022): 249. http://dx.doi.org/10.3390/fermentation8060249.
Повний текст джерелаАнотація:
In modern wine-making technology, there is an increasing concern in relation to the preservation of the biodiversity, and the employment of “new”, “novel” and wild-type Saccharomyces cerevisiae strains as cell factories amenable for the production of wines that are not “homogenous”, expressing their terroir and presenting interesting and “local” sensory characteristics. Under this approach, in the current study, several wild-type Saccharomyces cerevisiae yeast strains (LMBF Y-10, Y-25, Y-35 and Y-54), priorly isolated from wine and grape origin, selected from the private culture collection of the Agricultural University of Athens, were tested regarding their biochemical behavior on glucose-based (initial concentrations ca 100 and 200 g/L) shake-flask experiments. The wild yeast strains were compared with commercial yeast strains (viz. Symphony, Cross X and Passion Fruit) in the same conditions. All selected strains rapidly assimilated glucose from the medium converting it into ethanol in good rates, despite the imposed aerobic conditions. Concerning the wild strains, the best results were achieved for the strain LMBF Y-54 in which maximum ethanol production (EtOHmax) up to 68 g/L, with simultaneous ethanol yield on sugar consumed = 0.38 g/g were recorded. Other wild strains tested (LMBF Y-10, Y-25 and Y-35) achieved lower ethanol production (up to ≈47 g/L). Regarding the commercial strains, the highest ethanol concentration was achieved by S. cerevisiae Passion Fruit (EtOHmax = 91.1 g/L, yield = 0.45 g/g). Subsequently, the “novel” strain that presented the best technological characteristics regards its sugar consumption and alcohol production properties (viz. LMBF Y-54) and the commercial strain that equally presented the best previously mentioned technological characteristics (viz. Passion Fruit) were further selected for the wine-making process. The selected must originated from red and white grapes (Assyrtiko and Mavrotragano, Santorini Island; Greece) and fermentation was performed under wine-making conditions showing high yields for both strains (EtOHmax = 98–106 g/L, ethanol yield = 0.47–0.50 g/g), demonstrating the production efficiency under microaerophilic/anaerobic conditions. Molecular identification by rep-PCR carried out throughout fermentations verified that each inoculated yeast was the one that dominated during the whole bioprocess. The aromatic compounds of the produced wines were qualitatively analyzed at the end of the processes. The results highlight the optimum technological characteristics of the selected “new” wild strain (S. cerevisiae LMBF Y-54), verifying its suitability for wine production while posing great potential for future industrial applications.
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Lao-Hakosol, Wilaiporn, and John Walsh. "The Village Farm Resort and Winery." South Asian Journal of Business and Management Cases 3, no. 2 (November 24, 2014): 179–86. http://dx.doi.org/10.1177/2277977914548337.
Повний текст джерелаАнотація:
The Village Farm Resort and Winery is an integrated winemaking vineyard with wine tasting house, restaurant, spa and guest house located in the north-east of Thailand. It has achieved success both through the quality of its Chateau des Brumes brand of wines and for the conviviality available at the country retreat. These market sectors have become feasible in Thailand because of large-scale social and economic changes which have completely disrupted the marketing environment in the country. The sector is rapidly developing based on an expanding market and the passion and enthusiasm of investor-entrepreneurs. However, there are certain to be new challenges to be faced as the market matures.
Дисертації з теми "Passiti wines"
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Cheng, Bo. "Passive rotational damping in flapping flight." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 89 p, 2009. http://proquest.umi.com/pqdweb?did=1889090361&sid=9&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Повний текст джерела
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Piepmeier, Jeffrey R. "Remote sensing of ocean wind vectors by passive microwave polarimetry." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/15027.
Повний текст джерела
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Gauthier, Perron Sébastien. "Passive gust load alleviation through bend-twist coupling of composite beams on typical commercial airplane wings." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/77111.
Повний текст джерелаАнотація:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2012.Cataloged from department-submitted PDF version of thesis. This electronic version was submitted and approved by the author's academic department as part of an electronic thesis pilot project. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 89-91).
The effects of bend-twist coupling on typical commercial airplane wings are evaluated. An analytical formulation of the orthotropic box beam bending stiffness matrix is derived by combining Euler-Bernoulli beam theory and classical laminated plate theory. The out-of-plane displacement due to the twist of the cross section is modeled by a bilinear warping function. The analytical model is evaluated and validated against finite element analysis and experimental results. The model can accurately predict the twist and deformation of orthotropic box beams within 15% of the benchmarking data and provides best results for beams of higher aspect ratios and with layup angles below 30 degrees. Airplane level aero-structural simulations are performed in ASWING using models of Boeing's 737 and 777. The composite wings are sized for a static load increase and a set of gusts as prescribed by the FAA. Using unbalanced laminates to generate the structural coupling leads to significant strength penalties if the loading is not parallel to the laminate's fiber directions. The optimal laminate angle for which the weight saving benefits of bend-twist coupling are maximized corresponds to the wing's principal stress direction. Beyond that angle, the wings will exhibit more coupling but the laminate strength penalties are too large to be overcomed by the benefits of bend-twist coupling. The addition of coupling to the wings leads to reductions in peak spanwise bending moments in the order of 20% to 45%. It is demonstrated that the mechanism behind this reduction involves increased wing tip twist which alleviates part of the outboard wing load. This ultimately results in weight savings in the order of 2% to 4%. The findings suggest that the benefits of bend-twist coupling are more important on heavier airplanes such as the 777 due to the effects of the cube-square law.
by Sébastien Gauthier Perron.
S.M.
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Qin, Zhanming. "Vibration and Aeroelasticity of Advanced Aircraft Wings Modeled as Thin-Walled Beams--Dynamics, Stability and Control." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/29283.
Повний текст джерелаАнотація:
Based on a refined analytical anisotropic thin-walled beam model, aeroelastic instability, dynamic aeroelastic response, active/passive aeroelastic control of advanced aircraft wings modeled as thin-walled beams are systematically addressed. The refined thin-walled beam model is based on an existing framework of the thin-walled beam model and a couple of non-classical effects that are usually also important are incorporated and the model herein developed is validated against the available experimental, Finite Element Anaylsis (FEA), Dynamic Finite Element (DFE), and other analytical predictions. The concept of indicial functions is used to develop unsteady aerodynamic model, which broadly encompasses the cases of incompressible, compressible subsonic, compressible supersonic and hypersonic flows. State-space conversion of the indicial function based unsteady aerodynamic model is also developed. Based on the piezoelectric material technology, a worst case control strategy based on the minimax theory towards the control of aeroelastic systems is further developed. Shunt damping within the aeroelastic tailoring environment is also investigated. The major part of this dissertation is organized in the form of self-contained chapters, each of which corresponds to a paper that has been or will be submitted to a journal for publication. In order to fullfil the requirement of having a continuous presentation of the topics, each chapter starts with the purely structural models and is gradually integrated with the involved interactive field disciplines.Ph. D.
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Pelletier, Robert G. (Robert Gordon). "Multifractal characterization of aircraft-based measurements of turbulence and passive scalar fields within the surface boundary layer." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22788.
Повний текст джерелаАнотація:
This thesis represents the first large-scale, systematic study to use the double trace moment (DTM) technique in order to characterize the universal multifractal nature of aircraft-based measurements of wind velocity and several passive scalar concentrations under a variety of ambient conditions. Power-law scaling behaviour was demonstrated for the examined fields, from the smallest accessible measurement scales up to at least 250 km, right through the "mesoscale gap" postulated by the standard model of atmospheric dynamics. DTM results indicate remarkable stability in the estimates of the multifractality index, $ alpha$, and the codimension of mean singularity, $C sb1$, for wind velocity measured under different conditions of surface type, time of year, and measurement height within the surface boundary layer. Estimates for $ rm CO sb2, H sb2O, and O sb3$ were largely dominated by the wind velocity statistics as expected, but slightly sensitive to measurement height and moderately sensitive to significant changes in the underlying surface. Results showed that all of the fields examined may be classified as "unconditionally hard" multifractals, which is consistent with previously-published results for ground-based wind velocity measurements. It was demonstrated using probability distribution and multifractal analyses that ensemble statistical moments above approximately second-order can be expected to diverge for all examined fields due to the extremely singular nature of the fields at sub-resolution scales, and that the currently-employed quasi-local aircraft based sampling strategy is capable of reliably characterizing the statistical behaviour of the examined fields up to this physically-imposed limit. (Abstract shortened by UMI.)
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Thompson-Gillis, Heather Joy. ""Maddened by wine and by passion" the construction of gender and race in nineteenth-century American temperance literature /." Oxford, Ohio : Miami University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1181073516.
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Thompson-Gillis, Heather J. "“MADDENED BY WINE AND BY PASSION”: THE CONSTRUCTION OF GENDER AND RACE IN NINETEENTH-CENTURY AMERICAN TEMPERANCE LITERATURE." Miami University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=miami1181073516.
Повний текст джерела
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Otáhal, Miloslav. "VINAŘSKÝ DŮM NIKOLSBURG MIKULOV." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-414278.
Повний текст джерелаАнотація:
The subject of the diploma thesis is the design of a winery with small wine production, tasting rooms, a small wellness. Furthermore, a four-star hotel with a capacity of 40 people and a restaurant. This new building is located in the outskirts of Mikulov. The design concept is based on the use of suitable views and placement in the field. When solving the design, care is taken to comply with the principles of design of passive structures.
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Berenguer, Verdú Antonio José. "Analysis and design of efficient passive components for the millimeter-wave and THz bands." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/84004.
Повний текст джерелаАнотація:
This thesis tackles issues of particular interest regarding analysis and design of passive components at the mm-wave and Terahertz (THz) bands. Innovative analysis techniques and modeling of complex structures, design procedures, and practical implementation of advanced passive devices are presented.
The first part of the thesis is dedicated to THz passive components. These days, THz technology suffers from the lack of suitable waveguiding structures since both, metals and dielectric, are lossy at THz frequencies. This implies that neither conventional closed metallic structures used at microwave frequencies, nor dielectric waveguides used in the optical regime, are adequate solutions. Among a variety of new proposals, the Single Wire Waveguide (SWW) stands out due to its low attenuation and dispersion. However, this surface waveguide presents difficult excitation and strong radiation on bends. A Dielectric-Coated Single Wire Waveguide (DCSWW) can be used to alleviate these problems, but advantages of the SWW are lost and new problems arise.
Until now, literature has not given proper solution to radiation on bends and, on the other hand, rigorous characterization of these waveguides lacks these days. This thesis provides, for the first time, a complete modal analysis of both waveguides, appropriated for THz frequencies. This analysis is later applied to solve the problem of radiation on bends. Several structures and design procedures to alleviate radiation losses are presented and experimentally validated.
The second part of the thesis is dedicated to mm-wave passive components. These days, when implementing passive components to operate at such small, millimetric wavelengths, to ensure proper metallic contact and alignment between parts results challenging. In addition, dielectric absorption becomes significant at mm-wave frequencies. Consequently, conventional hollow metallic waveguides and planar transmission lines present high attenuation so that new topologies are being considered. Gap Waveguides (GWs), based on a periodic structure introducing an Electromagnetic Bandgap effect, result very suitable since they do not require metallic contacts and avoid dielectric losses.
However, although GWs have great potential, several issues prevent GW technology from becoming consolidated and universally used. On the one hand, the topological complexity of GWs difficulties the design process since full-wave simulations are time-costly and there is a lack of appropriate analysis methods and suitable synthesis procedures. On the other hand, benefits of using GWs instead of conventional structures are required to be more clearly evidenced with high-performance GW components and proper comparatives with conventional structures. This thesis introduces several efficient analysis methods, models, and synthesis techniques that will allow engineers without significant background in GWs to straightforwardly implement GW devices. In addition, several high-performance narrow-band filters operating at Ka-band and V-band, as well as a rigorous comparative with rectangular waveguide topology, are presented.Esta tesis aborda problemas actuales en el análisis y diseño de componentes pasivos en las bandas de onda milimétrica y Terahercios (THz). Se presentan nuevas técnicas de análisis y modelado de estructuras complejas, procedimientos de diseño, e implementación práctica de dispositivos pasivos avanzados. La primera parte de la tesis se dedica a componentes pasivos de THz. Actualmente no se disponen de guías de onda adecuadas a THz debido a que ambos, metales y dieléctricos, introducen grandes pérdidas. En consecuencia, no es adecuado escalar las estructuras metálicas cerradas usadas en microondas, ni las guías dieléctricas usadas a frecuencias ópticas. Entre un gran número de recientes propuestas, la Single Wire Waveguide (SWW) destaca por su baja atenuación y casi nula dispersión. No obstante, como guía superficial, la SWW presenta difícil excitación y radiación en curvas. El uso de un recubrimiento dieléctrico, creando la Dielecric-Coated Single Wire Waveguide (DCSWW), alivia estos inconvenientes, pero las ventajas anteriores se pierden y nuevos problemas aparecen. Hasta la fecha, no se han encontrado soluciones adecuadas para la radiación en curvas de la SWW. Además, se echa en falta una caracterización rigurosa de ambas guías. Esta tesis presenta, por primera vez, un análisis modal completo de SWW y DCSWW, adecuado a la banda de THz. Este análisis es aplicado posteriormente para evitar el problema de la radiación en curvas. Se presentan y validan experimentalmente diversas estructuras y procedimientos de diseño. La segunda parte de la tesis abarca componentes pasivos de ondas milimétricas. Actualmente, estos componentes sufren una importante degradación de su respuesta debido a que resulta difícil asegurar contacto metálico y alineamiento adecuados para la operación a longitudes de onda tan pequeñas. Además, la absorción dieléctrica incrementa notablemente a estas frecuencias. En consecuencia, tanto guías metálicas huecas como líneas de transmisión planares convencionales presentan gran atenuación, siendo necesario considerar topologías alternativas. Las Gap Waveguides (GWs), basadas en una estructura periódica que introduce un efecto de Electromagnetic Bandgap, resultan muy adecuadas puesto que no requieren contacto entre partes metálicas y evitan las pérdidas en dieléctricos. No obstante, a pesar del potencial de las GWs, varias barreras impiden la consolidación y uso universal de esta tecnología. Por una parte, la compleja topología de las GWs dificulta el proceso de diseño dado que las simulaciones de onda completa consumen mucho tiempo y no existen actualmente métodos de análisis y diseño apropiados. Por otra parte, es necesario evidenciar el beneficio de usar GWs mediante dispositivos GW de altas prestaciones y comparativas adecuadas con estructuras convencionales. Esta tesis presenta diversos métodos de análisis eficientes, modelos, y técnicas de diseño que permitirán la síntesis de dispositivos GW sin necesidad de un conocimiento profundo de esta tecnología. Asimismo, se presentan varios filtros de banda estrecha operando en las bandas Ka y V con altas prestaciones, así como una comparativa rigurosa con la guía rectangular.
Aquesta tesi aborda problemes actuals en relació a l'anàlisi i disseny de components passius en les bandes d'ona mil·limètrica i Terahercis. Es presenten noves tècniques d'anàlisi i modelatge d'estructures complexes, procediments de disseny, i implementació pràctica de dispositius passius avançats. La primera part de la tesi es focalitza en components passius de THz. Actualment no es disposen de guies d'ona adequades a THz causa que tots dos, metalls i dielèctrics, introdueixen grans pèrdues. En conseqüència, no és adequat escalar les estructures metál·liques tancades usades en microones, ni les guies dielèctriques usades a freqüències òptiques. Entre un gran nombre de propostes recents, la Single Wire Waveguide (SWW) destaca per la seua baixa atenuació i quasi nul·la dispersió. No obstant això, com a guia superficial, la SWW presenta difícil excitació i radiació en corbes. L'ús d'un recobriment dielèctric, creant la Dielecric-Coated Single Wire Waveguide (DCSWW), alleuja aquests inconvenients, però els avantatges anteriors es perden i nous problemes apareixen. Fins a la data, no s'han trobat solucions adequades per a la radiació en corbes de la SWW. A més, es troba a faltar una caracterització rigorosa d'ambdues guies. Aquesta tesi presenta, per primera vegada, un anàlisi modal complet de SWW i DCSWW, adequat a la banda de THz. Aquest anàlisi és aplicat posteriorment per evitar el problema de la radiació en corbes. Es presenten i validen experimentalment diverses estructures i procediments de disseny. La segona part de la tesi es centra en components passius d'ones mil·limètriques. Actualment, aquests components pateixen una important degradació de la seua resposta a causa de que resulta difícil assegurar contacte metàl·lic i alineament adequats per a l'operació a longituds d'ona tan menudes. A més, l'absorció dielèctrica incrementa notablement a aquestes freqüències. En conseqüència, tant guies metàl·liques buides com línies de transmissió planars convencionals presenten gran atenuació, sent necessari considerar topologies alternatives. Les Gap Waveguides (GWs), basades en una estructura periòdica que introdueix un efecte de Electromagnetic Bandgap, resulten molt adequades ja que no requereixen contacte entre parts metàl·liques i eviten les pèrdues en dielèctrics. No obstant, tot i el potencial de les GWs, diverses barreres impedixen la consolidació i ús universal d'aquesta tecnologia. D'una banda, la complexa topologia de les GWs dificulta el procés de disseny atés que les simulacions d'ona completa consumeixen molt de temps i no existeixen actualment mètodes d'anàlisi i disseny apropiats. D'altra banda, és necessari evidenciar el benefici d'utilitzar GWs mitjançant dispositius GW d'altes prestacions i comparatives adequades amb estructures convencionals. Aquesta tesi presenta diversos mètodes d'anàlisi eficients, models, i tècniques de disseny que permetran la síntesi de dispositius GW sense necessitat d'un coneixement profund d'aquesta tecnologia. Així mateix, es presenten diversos filtres de banda estreta operant en les bandes Ka i V amb altes prestacions, així com una comparativa rigorosa amb la guia rectangular.
Berenguer Verdú, AJ. (2017). Analysis and design of efficient passive components for the millimeter-wave and THz bands [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/84004
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LORENZINI, Marilinda. "A study on the yeast and mould biota associated with the production of Italian wines from post-harvest dried grapes." Doctoral thesis, 2012. http://hdl.handle.net/11562/394130.
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I vini Passiti ottenuti da uve che hanno subito un processo di appassimento sono vini rinomati e apprezzati dai consumatori principalmente per le complesse note sensoriali dovute al particolare processo di vinificazione. La fase di sovra-maturazione è fortemente influenzata dai microrganismi presenti sull’acino e in particolare da Botrytis cinerea in forma nobile. La presenza di questa muffa favorisce la disidratazione dell’acino e modifica la composizione del mosto che, infatti, presenta un elevato tenore zuccherino e contiene metaboliti secondari prodotti dalla muffa che possono inibire il processo fermentativo. Date queste condizioni stressanti per i lieviti, la fermentazione spontanea è spesso accompagnata da elevata produzione di acidità volatile oltre che a blocchi o arresti fermentativi. Di conseguenza, per controllare meglio questa fase critica una strategia biotecnologica innovativa potrebbe essere l'utilizzo di colture starter di lieviti autoctoni ben adattati a queste condizioni.
L’obiettivo di questo progetto di ricerca è stato - quindi - quello di acquisire conoscenze sulla diversità microbica associata alla produzione di alcuni vini italiani (quali Amarone, Vin Santo di Gambellara e Vino Santo Trentino) e di ottimizzare il processo di vinificazione attraverso l'uso di ceppi selezionati di B. cinerea e di lieviti autoctoni durante il processo di appassimento e la fermentazione.
In questo contesto, è stata allestita un’ampia collezione di muffe, tra cui B. cinerea, isolate da uve appassite, e una collezione di lieviti costituita da lieviti Saccharomyces e non-Saccharomyces isolati durante il processo di affinamento in caratelli e durante la fase di fermentazione di mosto Garganega utilizzato per la produzione del Vin Santo di Gambellara.
Per quento riguarda l’appassimento, a processo concluso, il vino ottenuto da queste uve è stato analizzato gas-cromatograficamente. I vini ottenuti hanno indicato differenze importanti tra le tesi inoculate e l'uva di controllo (non inoculata) per diversi composti volatili liberi. Come previsto, il livello più alto di 1-otten-3-olo (sapore di muffa) è stato trovato per i vini ottenuti da uve inoculato. Questi dati suggeriscono che l'inoculo di ceppi selezionati di B. cinerea su uva può influenzare le caratteristiche organolettiche del mosto/vino, consentendo così una diversificazione del prodotto finale.
Per quanto riguarda le prove di fermentazione guidata, l'analisi dei vini ha rivelato che la fermentazione spontanea produce un elevato livello di acetato di etile rispetto alle tesi inoculate con i ceppi selezionati di S. cerevisiae. Pertanto, l'uso di ceppi autoctoni può limitare la produzione di acidità volatile. Inoltre, l'analisi dei composti volatile ha evidenziato come tutti i vini ottenuti dai mosti fermentati con i ceppi selezionati presentano aromi associati a frutta bianca, alla rosa mandorla, fragola e caramello enfatizzando le proprietà aromatiche e il sapore del Vin Santo di Gambellara. L'analisi sensoriale ha ulteriormente confermato le differenze tra i diversi vini suggerendo quindi che l'uso di ceppi selezionati può migliorare il processo di fermentazione di vini passiti.
In conclusione, questo progetto di ricerca ha evidenziato che l'uso di ceppi indigeni opportunamente selezionati (muffe e lieviti) è in grado di migliorare l’intero processo di produzione dei vini passiti minimizzando i rischi di blocchi, arresti fermentativi e produzione di acidità volatile, nonchè di influenzare positivamente la qualità sensoriale del prodotto finito. Unitamente all’uso di culture starter, l'uso di metodi alternativi validi in sostituzione all’anidride solforosa (SO2) potrebbe migliorare l'impatto commerciale dei vini privi di conservanti chimici. In questo modo può essere soddisfatta la sempre più elevata domanda da parte dei consumatori di vini sicuri, salubri e organoletticamente distintivi.The wines obtained from post-harvest dried grapes are renowned wines, appreciated by consumers because of their complex sensorial notes due to the special vinification process, which involves the withering of grapes. The over-ripening phase is strongly influenced by the heterogeneous fungal biota present on the grape berry skin, and particularly by Botrytis cinerea. The development of the noble rot in berries affects the composition of the grape juice that presents high sugar content and inhibitory substances, as well. Therefore, grape juice fermentation proceeds hardly and is often accompanied by high production of volatile acidity. To better control the critical steps of Passito winemaking process, i.e. withering and fermentation, the use of suitable selected starter cultures could be applied as an innovative biotechnological strategy. Aims of this project were to increase knowledge about the diversity and evolution of indigenous eukaryotic microbiota associated with the production of some selected Italian wines (i.e. Amarone, Vin Santo di Gambellara, and Vino Santo Trentino) and to optimize the whole winemaking process through the use of selected indigenous strains of B. cinerea and yeasts. To these purposes, a large collection of moulds including B. cinerea was assembled; while a collection of yeasts (Saccharomyces and non-Saccharomyces) from wine aging in barrels and from the fermentation process of Garganega grape juice used for the production of Vin Santo di Gambellara was constituted. The isolates were identified using phenotypic and molecular methods, and then the collections were dereplicated by RAPD-PCR, PCR-RFLP, TEs, and microsatellite analysis. These techniques allowed the detection of a high genetic biodiversity among the B. cinerea and yeast isolates. The presence of distinctive strains could differentiate the withering of the studied grapes and the fermentation process, consequently selected strains of B. cinerea and yeasts were further characterized for several oenological properties (i.e. laccase activity and fungicide resistance for B. cinerea; resistance to stressful conditions and production of secondary metabolites for yeasts). In this way, strains of B. cinerea, S. cerevisiae and Zygosaccharomyces spp. were selected and tested in pilot-scale induction and fermentation trials, respectively. Considering the withering phase, at the end of the process the grapes were crushed and the grape juices were fermented. The gas-chromatographic analysis of the obtained wines indicated important differences between the inoculated and control grapes for several free volatile compounds. As expected, higher level of 1-octen-3-ol (mould flavor) was found for the wines obtained from the inoculated grape. These data suggest that the inoculum of selected B. cinerea strains on grapes influence the organoleptic characteristics of the must/wine, thus allowing a diversification of the final product. As regard the fermentation phase, the use of indigenous S. cerevisiae and non-Saccharomyces strains improved the fermentation process of Vin Santo di Gambellara. Indeed, failure to initiate fermentation and stuck fermentation were avoided, and a lower level of ethyl acetate was produced respect to the spontaneous fermentation. All selected S. cerevisiae yeasts produced flavors associated with white fruit, rose note, almond note and strawberry and caramel fragrance that emphasized the aromatic and flavor properties of this Passito wine. In conclusion, this research project suggests that the use of selected indigenous strains (moulds and yeasts) could improve the fermentation process of Passito wines minimizing risky conditions and improving the sensory quality of the final product. In other side, the use of valid alternative methods to SO2 addiction could improve the commercial impact of the wines free of chemical preservatives. In this way the modern consumer demand for wines that are safe and characterized by particular organoleptic flavour can be satisfied.
Книги з теми "Passiti wines"
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Storybook passion. [Bloomington, Indiana]: Xlibris, 2012.
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Ters, Didier. Saint-Emilion: Source of passion and union. [Bordeaux]: Confluences, 1998.
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McQuarrie, John. Canadian wings: The passion and the force. Toronto: McGraw-Hill Ryerson, 1990.
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Subong, Arenla M. Wings of passion: A collection of dramas. Dimapur, Nagaland: Heritage Publishing House, 2017.
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Iocca, Pasquale. Porto: A Portuguese creation, a British discovery, an American passion. Portugal: s.n., 1995.
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1970-, Johnson Andrea, and Holmes Robert 1943-, eds. Passion for pinot: A journey through America's pinot noir country. Berkeley, Calif: Ten Speed Press, 2009.
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1970-, Johnson Andrea, and Holmes Robert 1943-, eds. Passion for pinot: A journey through America's pinot noir country. Portland, Oregon: Carpe Diem Books, 2008.
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Airbus: Passion et savoir-faire = wings of change. Toulouse: Privat, 2010.
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Esposito, Sergio. Passion on the Vine. New York: Broadway Books, 2008.
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Lonjon, Bernard. Colette, la passion du vin. Paris: Les Éditions du Moment, 2013.
Знайти повний текст джерелаЧастини книг з теми "Passiti wines"
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Cotarella, Riccardo. "Methods of Vinification to Preserve the Colour in Red Grape Passiti Wines. Aleatico: A Case Study." In Sweet, Reinforced and Fortified Wines, 145–51. Oxford, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118569184.ch9.
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Scienza, Attilio. "Italian Passito Wines." In Sweet, Reinforced and Fortified Wines, 215–50. Oxford, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118569184.ch15.
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Eberle, Daniele. "Moscato Passito." In Sweet, Reinforced and Fortified Wines, 205–13. Oxford, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118569184.ch14.
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Keller, Reto B. "Components." In Design for Electromagnetic Compatibility--In a Nutshell, 145–88. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14186-7_11.
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AbstractIn order to choose the right components for EMI filters, it is essential to understand the properties and nonideal behavior of passive filter components. Therefore, in this chapter, the high-frequency behavior and other undesirable effects of conductors (wires, cables, PCB traces), resistors, capacitors, inductors, ferrite beads, common-mode chokes, baluns, varistors, and TVS diodes are presented.
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Brumont, Francis Brumont. "Deux ports semblables, mais que tout oppose: Bordeaux et Rouen au XVIe siècle." In Atti delle «Settimane di Studi» e altri Convegni, 297–315. Florence: Firenze University Press, 2019. http://dx.doi.org/10.36253/978-88-6453-857-0.16.
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The two major ports on the French Atlantic coast have many points in common, including the facilities of relations with their hinterland. But, in the sixteenth century, they had a very different destiny. Bordeaux was a passive port, waiting for the ships to load the products offered by its merchants (wine, pastel) and redistributing it in its hinterland. Rouen had to supply Paris and the Paris region, to bring raw materials for the Normandy industry and to look for outlets for its productions: this port therefore quickly turned to distant destinations where it could satisfy the needs of its economy.
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Loizou, Pinelopi, Mark Guishard, Kevin Mayall, Pier Luigi Vidale, Kevin I. Hodges, and Silke Dierer. "Development of a Simple, Open-Source Hurricane Wind Risk Model for Bermuda with a Sensitivity Test on Decadal Variability." In Hurricane Risk in a Changing Climate, 143–60. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08568-0_7.
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AbstractA hurricane-catastrophe model was developed for assessing risk associated with hurricane winds for Bermuda by combining observational knowledge with property value and exposure information. The sensitivity of hurricane wind risk to decadal variability of events was tested. The historical record of hurricanes passing within 185 km of Bermuda was created using IBTrACS. A representative exposure dataset of property values was developed by obtaining recent governmental Annual Rental Value data, while Miller et al. (Weather Forecast 28:159–174, 2013) provided a vulnerability relationship between increasing winds and damage. With a probabilistic approach, new events for 10,000 years were simulated for three different scenarios using (1) the complete record of annual TC counts; (2) two high-frequency periods and; (3) two low-frequency periods. Exceedance probability curves were constructed from event loss tables, focusing on aggregating annual losses from damaging events. Expected losses of low-frequency scenarios were less than losses of high-frequency scenarios or when the whole historical record was used. This framework suffers from uncertainties due to different assumptions and biases within IBTrACS. Small data sizes limit our ability to conduct a formal model validation and results should be interpreted in this context. In the future, sensitivity tests on the different components of the model will be performed.
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Dargel, G., A. M. Rodde, and J. R. Archambaud. "Assessment of the Capability of Drag Reduction of the Shock Control Device ‘SC Bump’ on Airfoil Flows and Application Aspects on Wings." In IUTAM Symposium on Mechanics of Passive and Active Flow Control, 57–62. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4199-4_8.
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Hirayama, T. "Passive Smoking and Cancer: The Association Between Husbands Smoking and Cancer in the Lung of Non-smoking Wives." In Indoor Air Quality, 299–311. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-83904-7_35.
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White, Robert E. "Soil and the Environment." In Soils for Fine Wines. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195141023.003.0003.
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English has no exact translation for the French word terroir. But terroir is one of the few words to evoke passion in any discussion about soils. One reason may be that wine is one product of the land where the consumer can ascribe a direct link between subtle variations in the character of the product and the soil on which it was grown. Wine writers and commentators now use the term terroir routinely, as they might such words as rendezvous, liaison, and café, which are completely at home in the English language. French vignerons and scientists have been more passionate than most in promoting the concept of terroir (although some such as Pinchon (1996) believe that the word terroir has been abused for marketing, sentimental, and political purposes). Their views range from the metaphysical—that “alone, in the plant kingdom, does the vine make known to us the true taste of the earth” (quoted by Hancock 1999, p. 43)—to the factual: “terroir viticole is a complex notion which integrates several factors . . . of the natural environment (soil, climate, topography), biological (variety, rootstock), and human (of wine, wine-making, and history)” (translated from van Leeuwen 1996, p. 1). Others recognize terroir as a dynamic concept of site characterization that comprises permanent factors (e.g., geology, soil, environment) and temporary factors (variety, cultural methods, winemaking techniques). Iacano et al. (2000) point out that if the temporary factors vary too much, the expression of the permanent factors in the wine (the essence of terroir) can be masked. The difference between wines from particular vineyards cannot be detected above the “background noise” (Martin 2000). A basic aim of good vineyard management is not to disguise, but to amplify, the natural terroir of a site. Terroir therefore denotes more than simply the relationship between soil and wine. Most scientists admit they cannot express quantitatively the relationship between a particular terroir and the characteristics of wine produced from that terroir. Nevertheless, the concept of terroir underpins the geographical demarcation of French viticultural areas: the Appellation d’Origine Contrôllée (AOC) system, which is based on many years’ experience of the character and quality of individual wines from specific areas.
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"IT’S ALL ABOUT THE WINS." In Kentucky Passion, 197–200. Red Lightning Books, 2021. http://dx.doi.org/10.2307/j.ctv21hrfjx.53.
Повний текст джерелаТези доповідей конференцій з теми "Passiti wines"
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Su, Pyae, Jose A. Mendoza, Duyen T. Nguyen, and Eun Jung Chae. "Control response of continuous trailing edge morphing wings." In Active and Passive Smart Structures and Integrated Systems XV, edited by Jae-Hung Han, Shima Shahab, and Gang Wang. SPIE, 2021. http://dx.doi.org/10.1117/12.2582840.
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Ringwald, Matthias, and Kay Romer. "Deployment of Sensor Networks: Problems and Passive Inspection." In 2007 Fifth Workshop on Intelligent Solutions in Embedded Systems. IEEE, 2007. http://dx.doi.org/10.1109/wises.2007.4408504.
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Jankauski, Mark A. "Passive Pitch Mechanics of Elastic Flapping Wings." In ASME 2018 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/dscc2018-8942.
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Many flapping wing micro air vehicles (FWMAVs) utilize a flexible joint that allows the wing to passively rotate about the pitching axis. Generally, simple rigid body models are used to estimate the passive pitching dynamics. However, evidence suggests elastic wings increase aerodynamic force generation and expend less energy relative to rigid wings. As a result, elastic wings are becoming an integral part of FWMAV design. But, the effect of wing elasticity on passive pitching mechanics is unclear. To explore this, we develop a coupled model of an elastic wing attached to a flexible pitching joint. Aerodynamic moments are included through a simple blade element approach. The model is applied to an idealized insect forewing subject to prescribed roll rotation. The simulation results suggest (1) aerodynamic moments, not rigid body inertia or elastic forces, are primarily responsible for lift-generating passive pitch, (2) joint stiffness influences pitching mechanics more than wing elasticity does, and (3) flexible wings can increase net lift by as much as 20% if the pitching joint is mistuned. The framework developed in this paper can be used to design and optimize FWMAV systems in terms of both elastic wings and flexible passive pitch joints.
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Kumar, David, Swapnil Shandilya, Vivek Khare, Sudhir Kamle, and Chih-Hung Chiang. "Insect-inspired micro air vehicle with nanocomposite flapping wings and flexure joints." In Active and Passive Smart Structures and Integrated Systems IX, edited by Jae-Hung Han, Shima Shahab, and Gang Wang. SPIE, 2020. http://dx.doi.org/10.1117/12.2557471.
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Taylor, Gordon, Andreas Kroker, and Ismet Gursul. "Passive Flow Control over Flexible Nonslender Delta Wings." In 43rd AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-865.
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Kang, Chang-Kwon, and Wei Shyy. "Modeling of Instantaneous Passive Pitch of Flexible Flapping Wings." In 43rd AIAA Fluid Dynamics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-2469.
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Ertlmeier, Rudolf, and Paul Spannaus. "Expanding design process of the Airbag Control Unit ACU - Connection of Active and Passive Safety by using vehicles dynamics for rollover and side crash detection." In 2008 International Workshop on Intelligent Solutions in Embedded Systems (WISES 2008). IEEE, 2008. http://dx.doi.org/10.1109/wises.2008.4623309.
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Li, Chengyu, Junshi Wang, Geng Liu, Xiaolong Deng, and Haibo Dong. "Passive Pitching Mechanism of Three-Dimensional Flapping Wings in Hovering Flight." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-4639.
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Abstract Flapping wings of insects can passively maintain a high angle of attack due to the torsional flexibility of wing basal region without the aid of the active pitching motion. However, the lift force generated by such passive pitching motion has not been well explored in the literature. Consequently, there is no clear understanding of how torsional wing flexibility should be designed for optimal performance. In this work, a computational study was conducted to investigate the passive pitching mechanism of flapping wings in hovering flight using a torsional spring model. The torsional wing flexibility was characterized by Cauchy number. The impacts of the inertial effect of wings were evaluated using the mass ratio. The aerodynamic forces and associated unsteady flow structures were simulated by an in-house immersed-boundary-method based computational fluid dynamic solver. A parametric study on the Cauchy number was performed with a Reynolds number of 300 at a mass ratio of 1.0, which covers a wide range of species of insect wings. According to the analysis of the aerodynamic performance, we found that the optimal lift can be achieved at a Cauchy number around 0.16, while the optimal efficiency in terms of lift-to-power ratio was reached at a Cauchy number around 0.3. All the corresponding wing pitching kinematics had a pitching magnitude around 60 degrees with slightly advanced rotation. In addition, 3D wake structures generated by the passive flapping wings were analyzed in detail. The findings of this work could provide important implications for designing more efficient flapping-wing micro air vehicles.
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de Oliveira, Rui, Enrico Bigi, Antoine Sigg, Véronique Michaud, and Jan-Anders E. Månson. "Passive damping of composites with embedded shape memory alloy wires." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Zoubeida Ounaies and Jiangyu Li. SPIE, 2010. http://dx.doi.org/10.1117/12.847570.
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Williams, Eric, Mohammad H. Elahinia, and Jeong-Hoi Koo. "Control of a Tuned Vibration Absorber Based on SMA Wires." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81546.
Повний текст джерелаАнотація:
This paper presents the control simulation results of a tuned vibration absorber (TVA) that utilizes the properties of shape memory alloy (SMA) wires. A conventional passive TVA is effective when it is precisely tuned to the frequency of a vibration mode; otherwise, resonance may occur that could damage the system. Additionally, in many applications the frequency of the primary system often changes over time. For example, the mass of the primary system can change causing a change in its natural frequency. This frequency change of the primary system can significantly degrade the performance of the TVA. To cope with this problem, many alternative TVA’s (such as semiactive, adaptive, and active TVA’s) have been studied. As another alternative, this paper investigates the use of Shape Memory Alloys (SMA’s) in passive TVA’s in order to improve the robustness of the TVA’s subject to mass change in the primary system. This allows for effective tuning of the stiffness of the TVA to adapt to the changes in the primary system’s natural frequency. To this end, a close-loop control system adjusts the applied current to the SMA wires in order to maintain the desired stiffness. The model, presented in this paper, contains the dynamics of the TVA along with the SMA wire model that includes phase transformation, heat transfer, and the constitutive relations. The closed-loop robustness analysis is performed for the SMA-TVA and is compared with the equivalent passive TVA. For the robustness analysis, the mass of the primary system is varied by ± 30% of its nominal mass. The simulation results show that the SMA-TVA is more robust than the equivalent passive TVA in reducing peak vibrations in the primary system subject to change of its mass.
Звіти організацій з теми "Passiti wines"
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Tao, Yang, Amos Mizrach, Victor Alchanatis, Nachshon Shamir, and Tom Porter. Automated imaging broiler chicksexing for gender-specific and efficient production. United States Department of Agriculture, December 2014. http://dx.doi.org/10.32747/2014.7594391.bard.
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Extending the previous two years of research results (Mizarch, et al, 2012, Tao, 2011, 2012), the third year’s efforts in both Maryland and Israel were directed towards the engineering of the system. The activities included the robust chick handling and its conveyor system development, optical system improvement, online dynamic motion imaging of chicks, multi-image sequence optimal feather extraction and detection, and pattern recognition. Mechanical System Engineering The third model of the mechanical chick handling system with high-speed imaging system was built as shown in Fig. 1. This system has the improved chick holding cups and motion mechanisms that enable chicks to open wings through the view section. The mechanical system has achieved the speed of 4 chicks per second which exceeds the design specs of 3 chicks per second. In the center of the conveyor, a high-speed camera with UV sensitive optical system, shown in Fig.2, was installed that captures chick images at multiple frames (45 images and system selectable) when the chick passing through the view area. Through intensive discussions and efforts, the PIs of Maryland and ARO have created the protocol of joint hardware and software that uses sequential images of chick in its fall motion to capture opening wings and extract the optimal opening positions. This approached enables the reliable feather feature extraction in dynamic motion and pattern recognition. Improving of Chick Wing Deployment The mechanical system for chick conveying and especially the section that cause chicks to deploy their wings wide open under the fast video camera and the UV light was investigated along the third study year. As a natural behavior, chicks tend to deploy their wings as a mean of balancing their body when a sudden change in the vertical movement was applied. In the latest two years, this was achieved by causing the chicks to move in a free fall, in the earth gravity (g) along short vertical distance. The chicks have always tended to deploy their wing but not always in wide horizontal open situation. Such position is requested in order to get successful image under the video camera. Besides, the cells with checks bumped suddenly at the end of the free falling path. That caused the chicks legs to collapse inside the cells and the image of wing become bluer. For improving the movement and preventing the chick legs from collapsing, a slowing down mechanism was design and tested. This was done by installing of plastic block, that was printed in a predesign variable slope (Fig. 3) at the end of the path of falling cells (Fig.4). The cells are moving down in variable velocity according the block slope and achieve zero velocity at the end of the path. The slop was design in a way that the deacceleration become 0.8g instead the free fall gravity (g) without presence of the block. The tests showed better deployment and wider chick's wing opening as well as better balance along the movement. Design of additional sizes of block slops is under investigation. Slops that create accelerations of 0.7g, 0.9g, and variable accelerations are designed for improving movement path and images.
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Hodul, M., H. P. White, and A. Knudby. A report on water quality monitoring in Quesnel Lake, British Columbia, subsequent to the Mount Polley tailings dam spill, using optical satellite imagery. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/330556.
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In the early morning on the 4th of August 2014, a tailings dam near Quesnel, BC burst, spilling approximately 25 million m3 of runoff containing heavy metal elements into nearby Quesnel Lake (Byrne et al. 2018). The runoff slurry, which included lead, arsenic, selenium, and vanadium spilled through Hazeltine Creek, scouring its banks and picking up till and forest cover on the way, and ultimately ended up in Quesnel Lake, whose water level rose by 1.5 m as a result. While the introduction of heavy metals into Quesnel Lake was of environmental concern, the additional till and forest cover scoured from the banks of Hazeltine Creek added to the lake has also been of concern to salmon spawning grounds. Immediate repercussions of the spill involved the damage of sensitive environments along the banks and on the lake bed, the closing of the seasonal salmon fishery in the lake, and a change in the microbial composition of the lake bed (Hatam et al. 2019). In addition, there appears to be a seasonal resuspension of the tailings sediment due to thermal cycling of the water and surface winds (Hamilton et al. 2020). While the water quality of Quesnel Lake continues to be monitored for the tailings sediments, primarily by members at the Quesnel River Research Centre, the sample-and-test methods of water quality testing used, while highly accurate, are expensive to undertake, and not spatially exhaustive. The use of remote sensing techniques, though not as accurate as lab testing, allows for the relatively fast creation of expansive water quality maps using sensors mounted on boats, planes, and satellites (Ritchie et al. 2003). The most common method for the remote sensing of surface water quality is through the use of a physics-based semianalytical model which simulates light passing through a water column with a given set of Inherent Optical Properties (IOPs), developed by Lee et al. (1998) and commonly referred to as a Radiative Transfer Model (RTM). The RTM forward-models a wide range of water-leaving spectral signatures based on IOPs determined by a mix of water constituents, including natural materials and pollutants. Remote sensing imagery is then used to invert the model by finding the modelled water spectrum which most closely resembles that seen in the imagery (Brando et al 2009). This project set out to develop an RTM water quality model to monitor the water quality in Quesnel Lake, allowing for the entire surface of the lake to be mapped at once, in an effort to easily determine the timing and extent of resuspension events, as well as potentially investigate greening events reported by locals. The project intended to use a combination of multispectral imagery (Landsat-8 and Sentinel-2), as well as hyperspectral imagery (DESIS), combined with field calibration/validation of the resulting models. The project began in the Autumn before the COVID pandemic, with plans to undertake a comprehensive fieldwork campaign to gather model calibration data in the summer of 2020. Since a province-wide travel shutdown and social distancing procedures made it difficult to carry out water quality surveying in a small boat, an insufficient amount of fieldwork was conducted to suit the needs of the project. Thus, the project has been put on hold, and the primary researcher has moved to a different project. This document stands as a report on all of the work conducted up to April 2021, intended largely as an instructional document for researchers who may wish to continue the work once fieldwork may freely and safely resume. This research was undertaken at the University of Ottawa, with supporting funding provided by the Earth Observations for Cumulative Effects (EO4CE) Program Work Package 10b: Site Monitoring and Remediation, Canada Centre for Remote Sensing, through the Natural Resources Canada Research Affiliate Program (RAP).