371 research outputs found
Reynolds number dependency of near-wall statistics of zero-pressure-gradient turbulent boundary layer
No full textWe report high-resolution LDA and HWA measurements of the streamwise velocity component of a flat-plate turbulent boundary layer (ZPG TBL) over a range of momentum thickness Reynolds number from 1,170 to 3,720. The primary objective of this work is to investigate the near-wall behavior and the scaling of high-order statistics. In particular, we are interested in certain Kármán number dependencies. The obtained data are in excellent agreement with most recent DNS-results, which allows direct comparison of detailed results such as peak value and position of streamwise stress, wall-values of skewness and flatness factors, and turbulence dissipation rate. The experimental data clearly reveal the failure of classical scaling. An alternative mixed scaling based on u?3/2ue1/2 removes these discrepancies
Pilk Richard Viidalepa perekonnaloole
No full textRichard Viidalepp (Widebaum before Estonianising his name, and later Viidebaum; Jan. 23, 1904 - June 3, 1986), the famous Estonian folklorist, was born in the Jalapuu farm in the village of Nurmsi in Central Estonia. The same farm was the home of Urve Buschmann, the author of the article and R. Viidalepp's niece. On the basis of the 1722 list of inhabitants in the Särgavere estate and the registers of the Järva Peetri congregation, the documented genealogy of Viidalepp's family starts with Jüri Jalapuu and his wife Els (?1730-?1761). In more recent registers their son Jüri (?1771-1843) already appears under the name Widebaum. The family was a typical Estonian family, including farmers, handicraftsmen, inventive technicians, later also intellectuals and artists. Some emigrated (the Finnish and American branches of the Viidebaums) and some were deported to Siberia. The fate of family members and descriptions of family history are illustrated by Richard Viidalepp's letters and family photographs. The last Viidalepps born in the Jalapuu farm moved to Tallinn in 1950
A fluorescent host-guest complex of cucurbituril in solution: a molecular Jack O'Lantern
No full textFluorescence enhancement of a probe molecule in solution by the container molecule cucurbituril (CB) is reported for the first time. The fluorescence of the probe 2-anilinonaphthalene-6-sulfonate (2,6-ANS) in aqueous Na2SO4 solution is found to increase by a maximum factor of 5.0 upon addition of cucurbituril. This fluorescence enhancement is the result of the formation of a host-guest inclusion complex, in which the guest 2,6-ANS is incorporated inside the cavity of the host, cucurbituril. Measurement of the enhancement as a function of cucurbituril concentration yielded a value of the equilibrium constant (K) of 52 +/- 10 M-1. It is proposed that the mode of inclusion involves the phenyl group of the 2,6-ANS, because of the relatively small size of the cucurbituril cavity. It is further proposed that the observed enhancement is a result of loss of rotational mobility of the phenyl ring relative to the naphthyl fluorophore of 2,6-ANS upon inclusion of the phenyl ring, Since the name cucurbituril is derived from the Latin word for "pumpkin," this fluorescent host-guest complex is referred to as a "molecular Jack O'Lantern," with the 2,6-ANS serving as the candle.PT: J; CR: BEHREND R, 1905, LIEBIGS ANN CHEM, V339, P1 BORTOLUS P, 1996, ADV PHOTOCHEMISTRY P, P1 BUSCHMANN HJ, 1992, J INCLUS PHENOM MOL, V14, P91 BUSCHMANN HJ, 1997, J INCLUS PHENOM MOL, V29, P167 BUSCHMANN HJ, 1998, THERMOCHIM ACTA, V317, P95 BUSCHMANN HJ, 1999, J PHOTOCH PHOTOBIO A, V121, P99 CINTAS P, 1994, J INCLUS PHENOM MOL, V17, P205 CRAM DJ, 1997, CONTAINER MOL THEIR DANTZ DA, 1998, SUPRAMOL CHEM, V9, P79 DELAPENA AM, 1993, J INCLUS PHENOM MOL, V15, P131 DIAMOND D, 1996, CHEM SOC REV, V25, P15 FREEMAN WA, 1981, J AM CHEM SOC, V103, P7367 HOFFMANN R, 1994, J CHEM SOC FARADAY T, V90, P1507 JEON YM, 1996, J AM CHEM SOC, V118, P9790 KOSOWER EM, 1975, J AM CHEM SOC, V97, P2167 KOSOWER EM, 1978, J AM CHEM SOC, V100, P4179 LI S, 1992, CHEM REV, V92, P1457 MOCK WL, 1983, J ORG CHEM, V48, P3618 MOCK WL, 1995, TOP CURR CHEM, V175, P1 MOCK WL, 1996, COMPREHENSIVE SUPRAM, V2, P477 WAGNER BD, 1998, J PHOTOCH PHOTOBIO A, V114, P151 WAGNER BD, 1999, J PHYS CHEM B, V103, P10114 WAGNER BD, 2000, J INCL PHENOM MACRO, V38, P467 WHANG DM, 1998, J AM CHEM SOC, V120, P4899; NR: 24; TC: 16; J9: CAN J CHEM; PG: 4; GA: 473RESource type: Electronic(1
Fluorescence enhancement of curcumin upon inclusion into cucurbituril
No full textThe effect of the macrocyclic host compounds cucurbit[n]urils (Qn), with n = 5 - 7, on the fluorescence of the biologically active compound curcumin has been studied. Curcumin, the main constituent of the Indian spice turmeric, is of growing interest because of its wide-ranging pharmaceutical properties. This compound forms strong 2:1 host-guest inclusion complexes with Q6 (the original cucurbituril), with an overall equilibrium constant of (1.9 +/- 0.8) X 10(4) M-2. It is postulated that a Q6 host partially encapsulates each of the two phenyl groups at the ends of the curcumin molecule. The difference in magnitude of the equilibrium constants K-1 (72 +/- 2 M-1) and K-1 (260 +/- 120 M-1) for stepwise encapsulation of the two ends of the curcumin molecule indicates that encapsulation by the first Q6 significantly alters its entire electronic structure, resulting in a more favorable second encapsulation. A very large enhancement of the fluorescence of curcumin results from this complex formation, on the order of 5.0; this is a significant fraction of the polarity sensitivity factor (PSF) of 39 measured for curcumin, that is the ratio of fluorescence intensity in ethanol vs. water. Surprisingly, no such enhancement could be observed in the case of Q7, indicating that the interactions between the guest and the host cavity are not favorable in this case, contrary to expectations. Similarly, no enhancement was observed in the case of Q5, which is not unexpected, because of the extremely small size of the host cavity and portal in this case.PT: J; CR: BARIK A, 2003, PHOTOCHEM PHOTOBIOL, V77, P597 BONG PH, 2000, B KOR CHEM SOC, V21, P81 BUSCHMANN HJ, 1997, J INCLUS PHENOM MOL, V29, P167 BUSCHMANN HJ, 1998, J SOLUTION CHEM, V27, P135 BUSCHMANN HJ, 1998, THERMOCHIM ACTA, V317, P95 BUSCHMANN HJ, 2000, J INCL PHENOM MACRO, V37, P231 BUSCHMANN HJ, 2000, SUPRAMOL CHEM, V11, P225 CHIGNELL CF, 1994, PHOTOCHEM PHOTOBIOL, V59, P295 CHOI S, 2002, MACROMOLECULES, V35, P3526 CINTAS P, 1994, J INCLUS PHENOM MOL, V17, P205 DAHL TA, 1994, PHOTOCHEM PHOTOBIOL, V59, P290 DALTON L, 2003, CHEM ENG NEWS SEP, P8 DAY A, 2001, J ORG CHEM, V66, P8094 DELAPENA AM, 1993, J INCLUS PHENOM MOL, V15, P131 ELHAOUAJ M, 2001, J CHEM SOC PERK NOV, P2104 ELHAOUAJ M, 2001, J CHEM SOC PERK T 2, P804 FREEMAN WA, 1981, J AM CHEM SOC, V103, P7367 FREEMAN WA, 1984, ACTA CRYSTALLOGR B, V40, P382 HAMAI S, 1996, B CHEM SOC JPN, V69, P2469 HOFFMANN R, 1994, J CHEM SOC FARADAY T, V90, P1507 JANSEN K, 2000, VOM WASSER, V95, P229 JEON YM, 1996, J AM CHEM SOC, V118, P9790 JOVANOVIC SV, 2001, J AM CHEM SOC, V123, P3064 KHOPDE SM, 2000, PHOTOCHEM PHOTOBIOL, V72, P625 KIM J, 2000, J AM CHEM SOC, V122, P540 LAGONA J, 2003, ORG LETT, V5, P3745 LEE JW, 2003, ACCOUNTS CHEM RES, V36, P621 LIU Y, 2000, J ORG CHEM, V65, P6227 MARQUEZ C, 2001, ANGEW CHEM INT EDIT, V40, P3155 MARQUEZ C, 2001, ANGEW CHEM INT EDIT, V40, P4387 MESCHKE C, 1997, THERMOCHIM ACTA, V297, P43 MOCK WL, 1983, J ORG CHEM, V48, P3618 MOCK WL, 1986, J ORG CHEM, V51, P4440 MOCK WL, 1989, J AM CHEM SOC, V111, P2697 MOCK WL, 1990, J CHEM SOC CHEM COMM, P1509 MOCK WL, 1995, TOP CURR CHEM, V175, P1 MOCK WL, 1996, COMPREHENSIVE SUPRAM, V2, P477 NEUGEBAUER R, 1998, J CHEM SOC PERK MAR, P529 NIGAM S, 1996, J PHYS CHEM-US, V100, P7135 ROBINSON TP, 2003, BIOORG MED CHEM LETT, V13, P115 SHIM JS, 2003, CHEM BIOL, V10, P695 SUN YM, 2002, ORG LETT, V4, P2909 SZELTLI J, 1998, CHEM REV, V98, P1743 TANG B, 2002, J AGR FOOD CHEM, V50, P1355 TONNESEN HH, 2002, INT J PHARM, V244, P127 WAGNER BD, 2000, J INCL PHENOM MACRO, V38, P467 WAGNER BD, 2001, CAN J CHEM, V79, P1101 WAGNER BD, 2003, J PHYS CHEM B, V107, P10741 WHANG D, 1996, J AM CHEM SOC, V118, P11333 WHANG D, 1998, ANGEW CHEM INT EDIT, V37, P78 WRIGHT JS, 2002, J MOL STRUC-THEOCHEM, V591, P207; NR: 51; TC: 8; J9: SUPRAMOL CHEM; PG: 7; GA: 876JJSource type: Electronic(1
Fabrieksschema: Zwavelkoolstof fabricage
No full textDocument(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
A Mátra-hegység sodrómoly faunája (Lepidoptera: Tortricidae)
No full textn this paper, the author reports 304 Tortricidae species known from Mátra up to the end of 2023, based on his own collections and the data published so far in the domestic literature
Biomechanics of tendons and ligaments : tissue reconstruction and regeneration /
No full textIncludes bibliographical references and index.Front Cover; Biomechanics of Tendons and Ligaments: Tissue Reconstruction and Regeneration; Copyright; Dedication; Contents; Part One: Fundamentals and biomechanics of tendons and ligaments; Chapter 1: Structure and function of tendon and ligament tissues; 1.1. Introduction; 1.2. Anatomy; 1.3. The structure of tendons and ligaments; 1.3.1. Healthy tendons and ligaments; 1.3.2. The components of the ECM; 1.3.3. The cells; 1.3.4. Growth factors; 1.3.5. Aging tendons and ligaments; 1.3.6. Tendinopathy; 1.4. Summary; ReferencesChapter 2: Biomechanical properties of tendons and ligaments in humans and animals2.1. Introduction; 2.2. Regional differences of biomechanical properties and impact of size; 2.3. Intrinsic factors: Gender and age; 2.4. Extrinsic factors: Physical activity and exercise; 2.5. Which tendon is the best (allo)graft in terms of material properties?; 2.6. Animal models; 2.6.1. Rabbit; 2.6.2. Sheep; 2.6.3. Mouse; 2.6.4. Rat; 2.6.5. Dog; 2.6.6. Pig; 2.6.7. Monkey; 2.6.8. Horse; 2.7. Summary; References; Chapter 3: Mechanobiology of tendons and ligaments; 3.1. Introduction3.2. Impact of loading on tendon cells3.2.1. Gene expression; 3.2.2. Gap junctions; 3.2.3. Calcium levels; 3.2.4. Degenerative tendon tissue; 3.2.5. Finite element model; 3.3. Effects of mechanical stimulation on ECM; 3.3.1. Collagen; 3.3.2. The noncollagenous part in the ECM; 3.3.3. Inflammatory response; 3.3.4. Changes of fiber strain and sliding under load; 3.4. Summary; References; Chapter 4: Experimental methods for measuring tendon and ligament biomechanics; 4.1. Introduction; 4.2. Classic tensile testing; 4.2.1. Load-displacement and stress-strain; 4.2.1.1. Load until failure4.2.1.2. Stiffness4.2.2. Loading rate; 4.2.3. Preconditioning; 4.2.4. Other testing conditions; 4.2.5. Fatigue tests; 4.3. Other biomechanical tests; 4.4. In vivo biomechanical tests; 4.5. Summary; References; Chapter 5: Imaging of tendons and ligaments in animal models; 5.1. Introduction; 5.2. Ultrasonography; 5.2.1. Overview; 5.2.2. Development of US as a diagnostic tool; 5.2.3. Comparison of US with histology and investigation of adhesion; 5.2.4. Correspondence of US with biomechanics; 5.2.5. Investigation of neovascularization after injury5.2.6. Extrinsic and intrinsic healing of tendons and ligaments5.2.7. Anatomical studies with US; 5.2.8. Summary; 5.3. Magnetic resonance; 5.3.1. Overview; 5.3.2. Investigation of morphological changes after injury; 5.3.3. Tissue engineering in tendon repair; 5.3.4. Diagnosis of tendon diseases; 5.3.5. Investigation of biomechanical properties; 5.3.6. Contrast agents in MRI; 5.4. Light microscopy, fluorescence microscopy; 5.4.1. Overview; 5.4.2. The tendon tissue (engineering) level; 5.4.3. The fascicle level; 5.4.4. The fiber level; 5.4.5. The fibril and microfibril levelOnline resource; title from PDF title page (EBSCO, viewed January 26, 2017).Elsevie
Mediating policing in the "fight against crime" and "rural terrorism" in Chile
No full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Thesis: S.M. in Comparative Media Studies, Massachusetts Institute of Technology, Department of Comparative Media Studies/Writing, 2019Cataloged from PDF version of thesis.Includes bibliographical references (pages 129-136).From drones to predictive policing systems, there has been an increasing incorporation of new security technologies over the last years in Chile to make the fight against crime and "rural terrorism" more effective, in a context marked by a persistent attention to feelings of insecurity. Even though surrounded by an aura of neutrality, these technologies are far from neutral, as they form part of a complex sociocultural fabric of people, practices, discourses, legal frameworks and institutions. Furthermore, instead of solving problems more effectively, these technologies are complicating preexisting tensions. This thesis delves into a critical study of the contemporary anatomy of power, in which mediation processes are becoming central to policing practices, with a focus on two contexts: the fight against crime in urban areas, and the battle against "rural violence" or "terrorism" in the Mapuche indigenous territories in the south of Chile.Drawing on media theories and governmentality studies, I offer the term operational atmospheres as a notion to think with and account for the composition of policing practices at the cross of vertical (aerial, orbital, and electromagnetic), algorithmic, and affective fields of actions. Operational atmospheres are entanglements of feelings, imaginaries, and discursive practices; technologies and techniques; local and transnational political economies and histories; that form perceptual systems, ways of seeing or sensing like a state which are contingent, partial and grounded on fragile and labor intensive processes, through which they come into existence. I take as a methodological framework Donna Haraway's situated knowedges to locate and shed light on the processes of manufacturing state's logistics of perception and their consequences on the (re)production and government of others' spaces and subjects, in this case, the Mapuche as a "terrorist", and the criminal in urban areas.In the context of "rural terrorism", I examine three police operations: the killing of Camilo Catrillanca by Comando Jungla; the fake intelligence police operation, Operacidn Huracdn; and the introduction of aerial surveillance in the "red zone". Through this analysis, I shed light on the central role mediation processes play to produce imaginaries of the Mapuche as criminals and terrorists, and to sustain the development of special police operations to target, deceive and incriminate Mapuche in the context of their mobilization to recover lands and autonomy, crossing colonial pasts, neoliberal extractive presents, and global security discourses and practices. I then examine the informational, algorithmic, and unmanned aerial systems mediating carabineros'work in urban spaces, conceived as the location of calculable risks mobilizing preemptive actions to affect feelings of (in)security.By the implementation of a local version of CompStat, the integration of predictive policing, and the use of drones, urban policing has increasingly expanded beyond the realm of preemptive actions into the formation of "safety" ambiances, becoming atmospheric, pervasive, and affective. More than answers, this thesis opens up contemporary mechanisms of security operating in Chile, to denaturalize and dismantle the neutrality and effectiveness attached to the implementation of new technologies in policing.by Josefina Buschmann Mardones.S.M. in Comparative Media StudiesS.M.inComparativeMediaStudies Massachusetts Institute of Technology, Department of Comparative Media Studies/Writin
Alkali-extracted hybrid carrageenans from Mastocarpus stellatus seaweeds grown in an IMTA: a palette of gelling properties
No full textMastocarpus stellatus are red seaweeds which can be exploited to produce κ/ι-hybrid carrageenan
(KI) [1]. The increasing demand of such additives in a wide range of industrial applications is
gearing the need for a sustainable production of this natural gelling agent. Following a recent
study on the seasonal variation of KI in the seaweed [2], Mastocarpus stellatus seaweeds were
collected on the Portuguese coast and then used as water cleaning agents in a fish farm, in order
to produce an Integrated Multi-Trophic Aquaculture (IMTA) system [3] allowing the sustainable
production of carrageenophytes. After a month in IMTA, seaweeds were alkali treated with NaOH
or KOH and KI were extracted. Here we report on the effects of the alkali concentration, alkali
treatment duration and type on the KI chemistry and gel properties in the presence of NaCl or
KCl. The originality of this study lies in the choice of seaweeds from which KI is isolated, namely
Mastocarpus stellatus grown in an IMTA, and also in the systematic comparison between the
chemistry of the seaweeds assessed with DRIFT and CP-MAS NMR and the chemical structure
of extracted KI. Gels of 1 %wt KI in 1M NaCl or 1M KCl solutions were rheologically tested
with SAOS. The thermo-rheological characteristics of gels will be presented and compared to the
chemical structure of extracted KI and of polysaccharides contained in the seaweeds.
[1] L. Hilliou, F.D.S Larotonda, A.M. Sereno, M.P. Gonc¸alves, Journal of Agricultural Food and Chemistry,
54, 7870 (2006).
[2] L. Hilliou, F.D.S Larotonda, P. Abreu, M.H. Abreu, A.M. Sereno, M.P. Gonc¸alves, Carbohydrate Polymers,
accepted (2012).
[3] M.H. Abreu, R. Pereira, C. Yarish, A.H. Buschmann, I. Sousa-pinto, Aquaculture, 312, 77 (2011).Fundação para a Ciência e a Tecnologia (FCT)FEDER through the program COMPETE (project PTDC/CTM/100076/2008)
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