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Статті в журналах з теми "Exhibitions. x"
1
Flores-Marcial, Xóchitl M. "Getting Community Engagement Right." Latin American and Latinx Visual Culture 3, no. 1 (January 1, 2021): 98–108. http://dx.doi.org/10.1525/lavc.2021.3.1.98.
Повний текст джерелаАнотація:
Greater Mexico refers both to the geographic region encompassing modern Mexico and its former territories in the United States, and to the Mexican cultural diaspora. Exhibitions of visual and material culture from greater Mexico have played an important role in articulating identities and affiliations that transcend limited definitions of citizenship. Following an introductory text by Jennifer Josten, five scholars offer firsthand insights into the intellectual, diplomatic, and logistical concerns underpinning key border-crossing exhibitions of the “NAFTA era.” Rubén Ortiz-Torres writes from his unique perspective as a Mexico City–based artist who began exhibiting in the United States in the late 1980s, and as a curator of recent exhibitions that highlight the existence of multiple Mexicos and Americas. Clara Bargellini reflects on a paradigm-shifting cross-border exhibition of the viceregal arts of the missions of northern New Spain. Kim N. Richter considers how the arts of ancient Mesoamerica and the Americas writ large figured within the Getty Foundation’s 2017 Pacific Standard Time: LA/LA initiative. Xóchitl M. Flores-Marcial offers insights into productive institutional collaborations with transnational Indigenous stakeholders, focusing on two recent Southern California exhibitions of the Oaxaca-based Tlacolulokos collective. Luis Vargas-Santiago discusses how Chicana/o/x art entered Mexico City’s Palacio de Bellas Artes in 2019 as a crucial component of an exhibition about how Mexican revolutionary Emiliano Zapata’s image has migrated through visual culture. Together, these texts demonstrate how exhibitions can act in the service of advancing more nuanced understandings of cultural and political interactions across greater Mexico.
2
Vargas-Santiago, Luis. "Emiliano." Latin American and Latinx Visual Culture 3, no. 1 (January 1, 2021): 109–19. http://dx.doi.org/10.1525/lavc.2021.3.1.109.
Повний текст джерелаАнотація:
Greater Mexico refers both to the geographic region encompassing modern Mexico and its former territories in the United States, and to the Mexican cultural diaspora. Exhibitions of visual and material culture from greater Mexico have played an important role in articulating identities and affiliations that transcend limited definitions of citizenship. Following an introductory text by Jennifer Josten, five scholars offer firsthand insights into the intellectual, diplomatic, and logistical concerns underpinning key border-crossing exhibitions of the “NAFTA era.” Rubén Ortiz-Torres writes from his unique perspective as a Mexico City–based artist who began exhibiting in the United States in the late 1980s, and as a curator of recent exhibitions that highlight the existence of multiple Mexicos and Americas. Clara Bargellini reflects on a paradigm-shifting cross-border exhibition of the viceregal arts of the missions of northern New Spain. Kim N. Richter considers how the arts of ancient Mesoamerica and the Americas writ large figured within the Getty Foundation’s 2017 Pacific Standard Time: LA/LA initiative. Xóchitl M. Flores-Marcial offers insights into productive institutional collaborations with transnational Indigenous stakeholders, focusing on two recent Southern California exhibitions of the Oaxaca-based Tlacolulokos collective. Luis Vargas-Santiago discusses how Chicana/o/x art entered Mexico City’s Palacio de Bellas Artes in 2019 as a crucial component of an exhibition about how Mexican revolutionary Emiliano Zapata’s image has migrated through visual culture. Together, these texts demonstrate how exhibitions can act in the service of advancing more nuanced understandings of cultural and political interactions across greater Mexico.
3
Ortiz-Torres, Rubén. "Mexicos and Americas." Latin American and Latinx Visual Culture 3, no. 1 (January 1, 2021): 70–79. http://dx.doi.org/10.1525/lavc.2021.3.1.70.
Повний текст джерелаАнотація:
Greater Mexico refers both to the geographic region encompassing modern Mexico and its former territories in the United States, and to the Mexican cultural diaspora. Exhibitions of visual and material culture from greater Mexico have played an important role in articulating identities and affiliations that transcend limited definitions of citizenship. Following an introductory text by Jennifer Josten, five scholars offer firsthand insights into the intellectual, diplomatic, and logistical concerns underpinning key border-crossing exhibitions of the “NAFTA era.” Rubén Ortiz-Torres writes from his unique perspective as a Mexico City–based artist who began exhibiting in the United States in the late 1980s, and as a curator of recent exhibitions that highlight the existence of multiple Mexicos and Americas. Clara Bargellini reflects on a paradigm-shifting cross-border exhibition of the viceregal arts of the missions of northern New Spain. Kim N. Richter considers how the arts of ancient Mesoamerica and the Americas writ large figured within the Getty Foundation’s 2017 Pacific Standard Time: LA/LA initiative. Xóchitl M. Flores-Marcial offers insights into productive institutional collaborations with transnational Indigenous stakeholders, focusing on two recent Southern California exhibitions of the Oaxaca-based Tlacolulokos collective. Luis Vargas-Santiago discusses how Chicana/o/x art entered Mexico City’s Palacio de Bellas Artes in 2019 as a crucial component of an exhibition about how Mexican revolutionary Emiliano Zapata’s image has migrated through visual culture. Together, these texts demonstrate how exhibitions can act in the service of advancing more nuanced understandings of cultural and political interactions across greater Mexico.
4
Bargellini, Clara. "Looking Back at The Arts of the Missions of Northern New Spain, 1600–1821." Latin American and Latinx Visual Culture 3, no. 1 (January 1, 2021): 80–87. http://dx.doi.org/10.1525/lavc.2021.3.1.80.
Повний текст джерелаАнотація:
Greater Mexico refers both to the geographic region encompassing modern Mexico and its former territories in the United States, and to the Mexican cultural diaspora. Exhibitions of visual and material culture from greater Mexico have played an important role in articulating identities and affiliations that transcend limited definitions of citizenship. Following an introductory text by Jennifer Josten, five scholars offer firsthand insights into the intellectual, diplomatic, and logistical concerns underpinning key border-crossing exhibitions of the “NAFTA era.” Rubén Ortiz-Torres writes from his unique perspective as a Mexico City–based artist who began exhibiting in the United States in the late 1980s, and as a curator of recent exhibitions that highlight the existence of multiple Mexicos and Americas. Clara Bargellini reflects on a paradigm-shifting cross-border exhibition of the viceregal arts of the missions of northern New Spain. Kim N. Richter considers how the arts of ancient Mesoamerica and the Americas writ large figured within the Getty Foundation’s 2017 Pacific Standard Time: LA/LA initiative. Xóchitl M. Flores-Marcial offers insights into productive institutional collaborations with transnational Indigenous stakeholders, focusing on two recent Southern California exhibitions of the Oaxaca-based Tlacolulokos collective. Luis Vargas-Santiago discusses how Chicana/o/x art entered Mexico City’s Palacio de Bellas Artes in 2019 as a crucial component of an exhibition about how Mexican revolutionary Emiliano Zapata’s image has migrated through visual culture. Together, these texts demonstrate how exhibitions can act in the service of advancing more nuanced understandings of cultural and political interactions across greater Mexico.
5
Richter, Kim N. "Golden Kingdoms at Getty." Latin American and Latinx Visual Culture 3, no. 1 (January 1, 2021): 88–97. http://dx.doi.org/10.1525/lavc.2021.3.1.88.
Повний текст джерелаАнотація:
Greater Mexico refers both to the geographic region encompassing modern Mexico and its former territories in the United States, and to the Mexican cultural diaspora. Exhibitions of visual and material culture from greater Mexico have played an important role in articulating identities and affiliations that transcend limited definitions of citizenship. Following an introductory text by Jennifer Josten, five scholars offer firsthand insights into the intellectual, diplomatic, and logistical concerns underpinning key border-crossing exhibitions of the “NAFTA era.” Rubén Ortiz-Torres writes from his unique perspective as a Mexico City–based artist who began exhibiting in the United States in the late 1980s, and as a curator of recent exhibitions that highlight the existence of multiple Mexicos and Americas. Clara Bargellini reflects on a paradigm-shifting cross-border exhibition of the viceregal arts of the missions of northern New Spain. Kim N. Richter considers how the arts of ancient Mesoamerica and the Americas writ large figured within the Getty Foundation’s 2017 Pacific Standard Time: LA/LA initiative. Xóchitl M. Flores-Marcial offers insights into productive institutional collaborations with transnational Indigenous stakeholders, focusing on two recent Southern California exhibitions of the Oaxaca-based Tlacolulokos collective. Luis Vargas-Santiago discusses how Chicana/o/x art entered Mexico City’s Palacio de Bellas Artes in 2019 as a crucial component of an exhibition about how Mexican revolutionary Emiliano Zapata’s image has migrated through visual culture. Together, these texts demonstrate how exhibitions can act in the service of advancing more nuanced understandings of cultural and political interactions across greater Mexico.
6
Josten, Jennifer. "Dialogues." Latin American and Latinx Visual Culture 3, no. 1 (January 1, 2021): 60–69. http://dx.doi.org/10.1525/lavc.2021.3.1.60.
Повний текст джерелаАнотація:
Greater Mexico refers both to the geographic region encompassing modern Mexico and its former territories in the United States, and to the Mexican cultural diaspora. Exhibitions of visual and material culture from greater Mexico have played an important role in articulating identities and affiliations that transcend limited definitions of citizenship. Following an introductory text by Jennifer Josten, five scholars offer firsthand insights into the intellectual, diplomatic, and logistical concerns underpinning key border-crossing exhibitions of the “NAFTA era.” Rubén Ortiz-Torres writes from his unique perspective as a Mexico City–based artist who began exhibiting in the United States in the late 1980s, and as a curator of recent exhibitions that highlight the existence of multiple Mexicos and Americas. Clara Bargellini reflects on a paradigm-shifting cross-border exhibition of the viceregal arts of the missions of northern New Spain. Kim N. Richter considers how the arts of ancient Mesoamerica and the Americas writ large figured within the Getty Foundation’s 2017 Pacific Standard Time: LA/LA initiative. Xóchitl M. Flores-Marcial offers insights into productive institutional collaborations with transnational Indigenous stakeholders, focusing on two recent Southern California exhibitions of the Oaxaca-based Tlacolulokos collective. Luis Vargas-Santiago discusses how Chicana/o/x art entered Mexico City’s Palacio de Bellas Artes in 2019 as a crucial component of an exhibition about how Mexican revolutionary Emiliano Zapata’s image has migrated through visual culture. Together, these texts demonstrate how exhibitions can act in the service of advancing more nuanced understandings of cultural and political interactions across greater Mexico.
7
Jørgensen, Anna Vestergaard. "Kunstkritik og institutionskritik i x-rummet." Periskop – Forum for kunsthistorisk debat, no. 21 (May 22, 2019): 70–87. http://dx.doi.org/10.7146/periskop.v2019i21.121797.
Повний текст джерелаАнотація:
In 2013, the SMK – National Gallery of Denmark initiated a series of exhibitions that was
supposed to deal with the role of the museum in the 21st century. This article focuses on
the two first exhibitions in this series: Haim Steinbach’s The Window and Henrik Olesen’s
Abandon the Parents. The article claims that these exhibitions can be seen as working
within the tradition of institutional critique, but also after it; through curating some of
the museum’s own works and mimicking, respectively, the modernist “white cube” aesthetics
and the Wunderkammer aesthetics. As such, the exhibitions do not only present
a critique but can also be seen as pragmatic suggestions for how to curate, how to think
the collections and exhibitions. In the article, the institutional critique of Olesen’s and
Steinbach’s exhibitions will be read through another critical position: the Danish art criticism.
In other words, this article does not only focus on how the institutional critique was
visualized and performed in the exhibitions, but how this critique was discussed and read
in written art criticism. This is not to say that art criticism and institutional critique can
be wholly separated, but to see how these two forms of critique can say something about
museums today. And more specifically, what affects can be read out of the art criticism,
when the exhibitions they criticize are so clearly contextualized (by the museum) as institutional
critique?
8
Vaughan, R. S. "Technical exhibitions." Anaesthesia 43, no. 7 (July 1988): 600–601. http://dx.doi.org/10.1111/j.1365-2044.1988.tb06702.x.
Повний текст джерела
9
Richardson, Megan. "Patents and Exhibitions." Journal of World Intellectual Property 12, no. 5 (September 2009): 402–21. http://dx.doi.org/10.1111/j.1747-1796.2009.00359.x.
Повний текст джерела
10
Haldane, DUNCAN, LUCY Gent, NIGEL Llewellyn, and ANN Sumner. "REVIEWS OF EXHIBITIONS." Renaissance Studies 4, no. 1 (March 1990): 76–92. http://dx.doi.org/10.1111/j.1477-4658.1990.tb00206.x.
Повний текст джерелаДисертації з теми "Exhibitions. x"
1
Vogel, Christian. "Exponierte Wissenschaft." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21216.
Повний текст джерелаАнотація:
Mit der Bekanntgabe der Entdeckung Röntgens 1895 begann nicht nur eine massive Bildproduktion, sondern auch ein reges radiologisches Ausstellungwesen, das sich an ein medizinisch-wissenschaftliches Publikum richtete und parallel zu wissenschaftlichen Kongressen stattfand. Die vorliegende Arbeit geht dieser Praxis des Ausstellens von Röntgenbildern und -apparaten im ersten Drittel des 20. Jahrhunderts nach und bezieht die Ausstellungen auf das im Entstehen begriffene medizinisch-wissenschaftliche Feld der Radiologie. Ausstellungen waren, so die zentrale These, keine dem radiologischen Erkenntnisprozess nachfolgenden Veranstaltungen, sondern Orte, bei denen ein radiologisches Apparate- und Bildwissen kommuniziert und erzeugt wurde. In der Arbeit wird die soziale, technische und expositorische Entwicklung des radiologischen Feldes parallel erzählt und eng miteinander verflochten gedacht. So geraten die engen Kopplungen zwischen Ausstellungsraum und Röntgeninstitut und zwischen technischer Entwicklung und professionellem Selbstverständnis von Radiologen in den Blick.With the discovery of X-rays in 1895 not only an increased image production can be observed, but also the new format of the X-ray exhibition was created. The exhibitions were mainly aimed at a medical and scientific audience and were organized parallel to scientific congresses. The work traces this practice of exhibiting X-ray images and apparatus in the first third of the 20th century and relates the exhibitions closely to the medical-scientific field of radiology that developed during this period. According to the central thesis, exhibitions were not events that took place after the genesis and development of radiological facts in the clinic or scientific institutes, but spaces where knowledge about the new apparatus and images was communicated and generated. In the work, the social, technical and exhibition-related development of the radiological field is told in parallel and thought of in close relation to each other. Using exhibitions as an example, the close links between exhibition spaces and X-ray institutes and between technical development and the professional self-image of radiologists are brought into focus.
2
Neely, David. "An experimental study of ASE soft X-ray laser action exhibiting high gain-length products." Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317466.
Повний текст джерела
3
Leigh, Nigel Royston. "Specific heat measurements on chevrel phase materials exhibiting coexistence of superconductivity and magnetism." Thesis, Durham University, 2001. http://etheses.dur.ac.uk/3849/.
Повний текст джерелаАнотація:
A probe for measuring the specific heat of superconductors at low temperatures and in high magnetic fields has been built and commissioned. The probe has been tested using the relaxation method on samples of copper and the accuracy of the data is 1.3 % between 5 K and 30 K, data taken using the long range pulse method has a resolution of 10 mK. Specific heat measurements have been performed on members of the series (Pb(_1)-(_x))Cu(_1.8x)Mo(_6)S(_8), (Sn(_1-x))Eu(_x)Mo(_6)S(_8) and (Pb(_1-x)M(_x))Mo(_6)S(_8) where M = Gd and Eu, from 3 K up to 30 K and in magnetic fields up to 15 T. Additional results from resistivity, susceptibility, magnetisation. X-ray diffraction, transmission electron microscopy and electron dispersive-ray measurements are also presented. These data have been compared to results from other authors and are analysed in terms of the BCS and GLAG theories of superconductivity and the magnetic properties of these materials. The mean field model has been used to calculate numerically the magnetic contribution to the specific heat (cm) of both ferromagnetic and antiferromagnetic systems as a function of temperature and applied field both above and below the ordering temperature. In addition an approximate analytic form for the magnetisation has been used to calculate Cm above the ordering temperature. Expressions have been derived for the saturation value of the peak in C(_m): C(^sat)(_m) = 1.1245n(_cell)RJI(J+1) and the temperature dependence of the peak with applied field ȡ(μ(_o)H(_ext))/ȡT(_peak)=6.540/g(_J)(J+1). They allow the simple calculation of the values of J and g(_J)(J + 1) from specific heat data. The magnetic contribution to the specific heat of the samples (Sn(_0.65)Eu(0.35)Mo(_6)S(_8)) and (Sn(0.50)Eu(_0.50)Mo(_6)S(_8)) have been modelled using these calculations and excellent agreement is found by considering the magnetic ions as free ions. The sample is accurately modelled by including an additional minority phase (Gd(_2)S(_3)). The approximate expressions have also been used to analyse data on high temperature superconductors producing values of J and g(_J)}{J + 1) consistent with a doublet ground state. The properties of Chevrel phase materials have been determined as a function of doping level. The critical temperature is degraded by doping but an increase in the critical current density is observed in the series (Pb(_1-x)Cu(_1-8x)Mo(_6)S(_8) for very low levels of doping. Increases of up to 28 % in the upper critical field, that are probably due to the compensation effect and an increase in the normal state resistivity, are also observed in the series (Sn(_1-x)Eu(_x)Mo(_6)S(_8)) at high levels of doping and in the series (Pb(_1-x)Gd(_x)Mo(_6)s(_8) for low levels of doping.
4
Chen, Shauwei, and 陳韶微. "Visitors' Exhibition Experiences: A Case Study of the Art Platform X Wooden Grid Showcase at the Stock 20." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/20340988480283848971.
Повний текст джерелаАнотація:
碩士東海大學
美術學系
101
Stock20, one of the successful art networks in warehouses in Taichung, Taiwan, provides not only cultural performances to enrich lives of visitors, but also creates opportunities for local as well as overseas resident artists to participate in a contemporary art environment. Moreover, the recent studies on visitors’ exhibition experiences have contributed to a better development of the museum, making it one of the most prominent museums in the city. The Quan art curatorial team, stationed at the Stock20 in 2010, had experimented on various methods to improve interactions between artworks and audiences. The team designed Art Platform X Wooden Grid Showcase in an aspiration to bringing more possibilities and experiences to Stock20. The wooden grid focuses on the theme of aesthetics from ordinary lives, aiming to draw identification from art background and non-art background participants as well as providing a variety of art works in display. The major focus of the dissertation is to investigate visitor interactions in both personal and physical context based on Stock20 and observations from the author’s position as a curator. This is done by reviewing the relationship between curators and visitors in curatorial team formation. The method of investigation bases upon the Interactive Experience Model by Falk, J. H. and Dierking, L. D (2000) as well as combining “art as experience” proposed by Dewey (1934). In addition, the research explores the relationship between visitor’s personal and physical context proposed by PineII, B.J. & Gilmore, J.H. (1998). Finally, the research employs qualitative research including participant observations and semi-structured interviews with visitors and interns in the museum. In addition to that, SPSS statistical software package are adopted to understand visitor’s distinguished characteristics. The study data analysis of visitor and intern experience uses Art Platform X Wooden Grid Showcase to explore experience affect. The findings of the research show that visiting experiences have to do with the communication platform constructed by curator, exhibition as well as visitors, and the experience effects vary due to different personal context.
5
Manju, U. "Investigation Of Electronic Structure Of Transition Metal Oxides Exhibiting Metal-insulator Transitions And Related Phenomena." Thesis, 2008. https://etd.iisc.ac.in/handle/2005/789.
Повний текст джерелаАнотація:
Transition metal oxides have proven to be a fertile research area for condensed matter physicists due to the fascinating array of superconducting, magnetic and electronic properties they exhibit. A particular resurgence of intense activity in investigating the properties of these systems followed the discovery of high temperature superconductivity in the cuprates, colossal magnetoresistance in the manganites, ferroelectricity in the cobaltites and simultaneous ferroelectric and ferromagnetic ordering in the manganites. These diverse properties of transition metal compounds arise due to the presence of strong electron-electron interactions within the transition element 3d states. Indeed, it is the competition between the localizing effects of such interactions and the comparable hopping strengths driving the system towards delocalization, that is responsible for these wide spectrum of interesting properties. In terms of theoretical and fundamental issues, electronic structure of transition metal oxides play a most important role, providing a testing ground for new many-body theoretical approaches treating the correlation problem at various levels of approximations. In addition to this rich spectrum of properties, metal-insulator transitions often occur and can even be coincident with structural or magnetic changes due to the strong coupling between charge, magnetic and lattice degrees of freedom. However, in spite of the immense activities in this area, the underlying phenomena is not yet completely understood. A careful investigation of the electronic structure of these systems will help in the microscopic understanding of these and photoelectron spectroscopy has been established as the most powerful tool for investigating the electronic structures of these systems. In this thesis we investigate the electronic structures of some of these transition metal oxides and the metal-insulator transition as a function of electron correlation strength and doping of charge carriers by means of photoelectron spectroscopy; we analyze the experimental results using various theoretical approaches, in order to obtain detailed and quantitative understandings. This thesis is organized into seven chapters. Chapter 1 is a general introduction to the various concepts discussed in this thesis. Here we briefly describe the various mechanisms and theoretical formalisms used for understanding the metal-insulator transitions in strongly correlated systems and the evolution of the electronic structure across the transition. The experimental and the calculational techniques used in this thesis is described in Chapter 2. This includes different sample synthesis techniques and the characterization tools used in the present study. Photoelectron spectroscopic techniques used for probing the electronic structure of various systems are also discussed in this chapter.
In Chapter 3, we discuss the coexistence of ferromagnetism and superconductivity in ruthenocuprates by looking at the electronic structures of RuSr2Eu1.5Ce0.5Cu2O10 which is a ferromagnetic superconductor having the ferromagnetic TC ~ 100 K and a superconducting transition of ~ 30 K compared with RuSr2EuCeCu2O10 which is a ferromagnetic (TC ~ 150 K) insulator in conjunction with two reference systems, RuSr2GdO6and Sr2RuO4. The coexistence of ferromagnetic order with superconductivity below the superconducting temperature is an interesting issue since the pair-breaking due to magnetic interactions is not significant in these cases. Extensive photoelectron spectroscopic measurements were performed on these systems and our results show that Eu and Ce in both the ruthenocuprates exists in 3+ and 4+ states, respectively. Also the analysis of the Ru 3d and 3p core levels suggests that Ru remains in the pentavalent state in both the cases. The constancy of Ru valency with doping of charge carriers that bring about an insulator to metal transition and the superconducting state suggests that the electronic structure and transport properties of these compounds are not governed by the Ru-O plane, but by the Cu-O plane, much as in the case of other high TC cuprates. Analysis of the Cu 2p core level spectra in terms of a cluster model, including configuration interaction and multiplet interactions between Cu 3d and 2p as well as that within the Cu 3d states, establish a close similarity of the basic electronic structure of these ruthenocuprates to those of other high TC cuprates. Here the charge transfer energy, Δ << Udd,Cu 3d multiplet-averaged Coulomb repulsion energy, establishing the compounds to be deep in the charge transfer regime.
Continuing with the ruthenocuprate systems in Chapter 4, we look at the electronic structure of hole doped La2CuRuO6systems using various photoemission techniques. It was expected that since the substitution of La3+by Sr2+changes the d electron count, the system will undergo a metal to insulator transition, but the transport properties show that all of them remain semiconducting through out the lowest temperature of measurement. A careful analysis of the Ru 3d and 3p core level spectra shows that Ru exists in Ru 4+state in La2CuRuO6and goes towards Ru 5+state with hole doping. This suggests that the doped holes affects the electronic structure of the Ru levels in these systems. A spectral decomposition of the Ru 3d core level suggests the existence of a spin orbit split doublet having two peaks, a main core level peak and a satellite peak at the higher binding energy side of the main peak and the intensity ratio of the satellite peak to the main peak increases with the insulating nature of the compounds as reported for other Ru 4d strongly correlated systems. This observation is also consistent with the transport properties. Cu 2p core level spectra also shows variations in the satellite-to-main peak Cu 2p intensities suggesting that the electronic structure of the Cu levels are also getting affected with Sr doping. Valence band spectral features near the Fermi level shows that the spectral weight is highest for La2CuRuO6and depletes slowly with Sr doping consistent with the expected d electron count as suggested by the Ru valencies.
In Chapter 5 and Chapter 6 we discuss the electronic structure investigations of two early transition metal oxide series, namely Ca1−xSrxVO3and Ce1−xSrxTiO3. Surface sensitivity dependence of photoemission experiments has been explored to show that the surface and the bulk electronic structures of Ca1−xSrxVO3system is different. Photoemission spectra of this system using synchrotron radiation reveal a hither to unnoticed polarization dependence of the photoemission matrix elements for the surface component leading to substantial underestimation. Extracted bulk spectra from experimentally determined electron escape depth and underestimation of surface contributions resolve the puzzling issues that arose due to the recent diverse interpretations of the electronic structure in Ca1−xSrxVO3. Keeping in mind the above-mentioned caveat, the present results still clearly establish that the linear polarization of synchrotron radiation plays a key role in determining the spectral lineshape in these systems. The experimentally-determined bulk spectra provide an understanding of the electronic structure in Ca1−xSrxVO3, consistent with experimental γ values, calculated change in the d-bandwidth and the geometrical/structural trends across the series, thereby resolving the puzzle concerning the structure-property relationship in this interesting class of compounds. In Chapter 6 we discuss the issues of metal-insulator transition close to the d0limit as well as the evolution of the electronic structure of a strongly correlated system as a function of electron occupancy, by investigating the family of Ce1−xSrxTiO3compounds by recording core level as well as valence band photoemission spectra using lab source as well as synchrotron radiations. Core level Ce 3d spectra from Ce1−xSrxTiO3samples establish a trivalent state of Ce in these compounds for all values of x confirming that charge doping in the present system does not alter the electronic structure of Ce. Hence the change in valency due to Sr substitution and thus, the carrier number, takes place only in the Ti 3d-O 2p manifold. We also carried out extensive VUV photoemission experiments on these samples with the photon energy varying between 26-122 eV. From the difference spectrum obtained by subtracting the off-resonance spectrum from the on-resonance one, we obtain the Ce 4f spectral signature; thus obtained Ce 4f spectrum which has a peak at about 3 eV binding energy and shows no intensity at EF even for the metallic samples, consistent with a Ce3+state. In order to study the states near EF responsible for the metal-insulator transition in these compounds, we recorded the valence band spectra at the Ce 4f off-resonance condition so that the coherent and the incoherent spectral features arising from the Ti 3d states could be clearly resolved, allowing us to investigate the metal insulator transition in the Ce1−xSrxTiO3system as a function of Sr or hole doping. The experimental spectra of the metallic compounds exhibit an intensity of the incoherent feature considerably larger than that predicted by theory. This discrepancy is possibly due to a difference in the surface and the bulk electronic structures of these compounds.
Chapter 7 is divided into two parts. In the first part we discuss the extended x-ray absorption fine structure (EXAFS) studies performed on two transition metal oxide series, La1−xSrxCoO3and La1−xSrxFeO3to look at the local structure distortions happening around the transition metal ions and its role in bringing out metal to insulator transitions in transition metal oxide systems. Here we chose to investigate these two systems since La1−xSrxCoO3undergoes an insulator to metal transition for x ∼ 0.15 and La1−xSrxFeO3remains insulating for the entire range of doping. The static mean square relative displacement, which we believe to be a representation of the disorder present in the system, extracted by fitting the experimental data by a correlated Einstein model, as a function of composition in La1−xSrxCoO3saturates beyond the critical composition where as the disorder parameter continues to increase through out the entire doping range in the case of La1−xSrxFeO3where metal-insulator transition is absent. In the second part of Chapter 7 we discuss the x-ray absorption near edge structure (XANES) studies performed on the above mentioned series of systems. Co K-edge XANES spectra of La1−xSrxCoO3show that there is a systematic shift of the main absorption peak with hole doping suggesting that the Co valency changes systematically with Sr doping. Also, the pre-edge feature of LaCoO3shows the transitions to t2g level clearly showing that Co3+in LaCoO3is not in a pure low spin (t6 2g) state. The Fe K-edge XANES spectra of La1−xSrxFeO3also exhibit a systematic shift to the higher energy side with increase in Sr content, indicating an increase in the Fe valence. Also from the La L3edge analysis, it can be concluded that the oxygen environment around La and the electronic configuration of La are systematically changing with Sr doping.
6
Manju, U. "Investigation Of Electronic Structure Of Transition Metal Oxides Exhibiting Metal-insulator Transitions And Related Phenomena." Thesis, 2008. http://hdl.handle.net/2005/789.
Повний текст джерелаАнотація:
Transition metal oxides have proven to be a fertile research area for condensed matter physicists due to the fascinating array of superconducting, magnetic and electronic properties they exhibit. A particular resurgence of intense activity in investigating the properties of these systems followed the discovery of high temperature superconductivity in the cuprates, colossal magnetoresistance in the manganites, ferroelectricity in the cobaltites and simultaneous ferroelectric and ferromagnetic ordering in the manganites. These diverse properties of transition metal compounds arise due to the presence of strong electron-electron interactions within the transition element 3d states. Indeed, it is the competition between the localizing effects of such interactions and the comparable hopping strengths driving the system towards delocalization, that is responsible for these wide spectrum of interesting properties. In terms of theoretical and fundamental issues, electronic structure of transition metal oxides play a most important role, providing a testing ground for new many-body theoretical approaches treating the correlation problem at various levels of approximations. In addition to this rich spectrum of properties, metal-insulator transitions often occur and can even be coincident with structural or magnetic changes due to the strong coupling between charge, magnetic and lattice degrees of freedom. However, in spite of the immense activities in this area, the underlying phenomena is not yet completely understood. A careful investigation of the electronic structure of these systems will help in the microscopic understanding of these and photoelectron spectroscopy has been established as the most powerful tool for investigating the electronic structures of these systems. In this thesis we investigate the electronic structures of some of these transition metal oxides and the metal-insulator transition as a function of electron correlation strength and doping of charge carriers by means of photoelectron spectroscopy; we analyze the experimental results using various theoretical approaches, in order to obtain detailed and quantitative understandings. This thesis is organized into seven chapters. Chapter 1 is a general introduction to the various concepts discussed in this thesis. Here we briefly describe the various mechanisms and theoretical formalisms used for understanding the metal-insulator transitions in strongly correlated systems and the evolution of the electronic structure across the transition. The experimental and the calculational techniques used in this thesis is described in Chapter 2. This includes different sample synthesis techniques and the characterization tools used in the present study. Photoelectron spectroscopic techniques used for probing the electronic structure of various systems are also discussed in this chapter.
In Chapter 3, we discuss the coexistence of ferromagnetism and superconductivity in ruthenocuprates by looking at the electronic structures of RuSr2Eu1.5Ce0.5Cu2O10 which is a ferromagnetic superconductor having the ferromagnetic TC ~ 100 K and a superconducting transition of ~ 30 K compared with RuSr2EuCeCu2O10 which is a ferromagnetic (TC ~ 150 K) insulator in conjunction with two reference systems, RuSr2GdO6and Sr2RuO4. The coexistence of ferromagnetic order with superconductivity below the superconducting temperature is an interesting issue since the pair-breaking due to magnetic interactions is not significant in these cases. Extensive photoelectron spectroscopic measurements were performed on these systems and our results show that Eu and Ce in both the ruthenocuprates exists in 3+ and 4+ states, respectively. Also the analysis of the Ru 3d and 3p core levels suggests that Ru remains in the pentavalent state in both the cases. The constancy of Ru valency with doping of charge carriers that bring about an insulator to metal transition and the superconducting state suggests that the electronic structure and transport properties of these compounds are not governed by the Ru-O plane, but by the Cu-O plane, much as in the case of other high TC cuprates. Analysis of the Cu 2p core level spectra in terms of a cluster model, including configuration interaction and multiplet interactions between Cu 3d and 2p as well as that within the Cu 3d states, establish a close similarity of the basic electronic structure of these ruthenocuprates to those of other high TC cuprates. Here the charge transfer energy, Δ << Udd,Cu 3d multiplet-averaged Coulomb repulsion energy, establishing the compounds to be deep in the charge transfer regime.
Continuing with the ruthenocuprate systems in Chapter 4, we look at the electronic structure of hole doped La2CuRuO6systems using various photoemission techniques. It was expected that since the substitution of La3+by Sr2+changes the d electron count, the system will undergo a metal to insulator transition, but the transport properties show that all of them remain semiconducting through out the lowest temperature of measurement. A careful analysis of the Ru 3d and 3p core level spectra shows that Ru exists in Ru 4+state in La2CuRuO6and goes towards Ru 5+state with hole doping. This suggests that the doped holes affects the electronic structure of the Ru levels in these systems. A spectral decomposition of the Ru 3d core level suggests the existence of a spin orbit split doublet having two peaks, a main core level peak and a satellite peak at the higher binding energy side of the main peak and the intensity ratio of the satellite peak to the main peak increases with the insulating nature of the compounds as reported for other Ru 4d strongly correlated systems. This observation is also consistent with the transport properties. Cu 2p core level spectra also shows variations in the satellite-to-main peak Cu 2p intensities suggesting that the electronic structure of the Cu levels are also getting affected with Sr doping. Valence band spectral features near the Fermi level shows that the spectral weight is highest for La2CuRuO6and depletes slowly with Sr doping consistent with the expected d electron count as suggested by the Ru valencies.
In Chapter 5 and Chapter 6 we discuss the electronic structure investigations of two early transition metal oxide series, namely Ca1−xSrxVO3and Ce1−xSrxTiO3. Surface sensitivity dependence of photoemission experiments has been explored to show that the surface and the bulk electronic structures of Ca1−xSrxVO3system is different. Photoemission spectra of this system using synchrotron radiation reveal a hither to unnoticed polarization dependence of the photoemission matrix elements for the surface component leading to substantial underestimation. Extracted bulk spectra from experimentally determined electron escape depth and underestimation of surface contributions resolve the puzzling issues that arose due to the recent diverse interpretations of the electronic structure in Ca1−xSrxVO3. Keeping in mind the above-mentioned caveat, the present results still clearly establish that the linear polarization of synchrotron radiation plays a key role in determining the spectral lineshape in these systems. The experimentally-determined bulk spectra provide an understanding of the electronic structure in Ca1−xSrxVO3, consistent with experimental γ values, calculated change in the d-bandwidth and the geometrical/structural trends across the series, thereby resolving the puzzle concerning the structure-property relationship in this interesting class of compounds. In Chapter 6 we discuss the issues of metal-insulator transition close to the d0limit as well as the evolution of the electronic structure of a strongly correlated system as a function of electron occupancy, by investigating the family of Ce1−xSrxTiO3compounds by recording core level as well as valence band photoemission spectra using lab source as well as synchrotron radiations. Core level Ce 3d spectra from Ce1−xSrxTiO3samples establish a trivalent state of Ce in these compounds for all values of x confirming that charge doping in the present system does not alter the electronic structure of Ce. Hence the change in valency due to Sr substitution and thus, the carrier number, takes place only in the Ti 3d-O 2p manifold. We also carried out extensive VUV photoemission experiments on these samples with the photon energy varying between 26-122 eV. From the difference spectrum obtained by subtracting the off-resonance spectrum from the on-resonance one, we obtain the Ce 4f spectral signature; thus obtained Ce 4f spectrum which has a peak at about 3 eV binding energy and shows no intensity at EF even for the metallic samples, consistent with a Ce3+state. In order to study the states near EF responsible for the metal-insulator transition in these compounds, we recorded the valence band spectra at the Ce 4f off-resonance condition so that the coherent and the incoherent spectral features arising from the Ti 3d states could be clearly resolved, allowing us to investigate the metal insulator transition in the Ce1−xSrxTiO3system as a function of Sr or hole doping. The experimental spectra of the metallic compounds exhibit an intensity of the incoherent feature considerably larger than that predicted by theory. This discrepancy is possibly due to a difference in the surface and the bulk electronic structures of these compounds.
Chapter 7 is divided into two parts. In the first part we discuss the extended x-ray absorption fine structure (EXAFS) studies performed on two transition metal oxide series, La1−xSrxCoO3and La1−xSrxFeO3to look at the local structure distortions happening around the transition metal ions and its role in bringing out metal to insulator transitions in transition metal oxide systems. Here we chose to investigate these two systems since La1−xSrxCoO3undergoes an insulator to metal transition for x ∼ 0.15 and La1−xSrxFeO3remains insulating for the entire range of doping. The static mean square relative displacement, which we believe to be a representation of the disorder present in the system, extracted by fitting the experimental data by a correlated Einstein model, as a function of composition in La1−xSrxCoO3saturates beyond the critical composition where as the disorder parameter continues to increase through out the entire doping range in the case of La1−xSrxFeO3where metal-insulator transition is absent. In the second part of Chapter 7 we discuss the x-ray absorption near edge structure (XANES) studies performed on the above mentioned series of systems. Co K-edge XANES spectra of La1−xSrxCoO3show that there is a systematic shift of the main absorption peak with hole doping suggesting that the Co valency changes systematically with Sr doping. Also, the pre-edge feature of LaCoO3shows the transitions to t2g level clearly showing that Co3+in LaCoO3is not in a pure low spin (t6 2g) state. The Fe K-edge XANES spectra of La1−xSrxFeO3also exhibit a systematic shift to the higher energy side with increase in Sr content, indicating an increase in the Fe valence. Also from the La L3edge analysis, it can be concluded that the oxygen environment around La and the electronic configuration of La are systematically changing with Sr doping.
Книги з теми "Exhibitions. x"
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Bałka, Mirosław. 17 x 23,5 x 1,6. London: Jay Jopling/White Cube, 2009.
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Bałka, Mirosław. 17 x 23,5 x 1,6. London: Jay Jopling/White Cube, 2009.
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Partyka, Tomek. Tomek Partyka: X Times X. Brussles: Roberto Polo Gallery, 2015.
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Catany, Tony, and Fernando Golvano. 7 x 7 x 7. Bilbao [Spain]: Rekalde, 2000.
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editor, Sardo Delfim, and Culturgest Porto (Gallery), eds. Michael Biberstein: X. Porto: Culturgest, 2019.
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Charrua, António Dias. X de Charrua: 19.06.15 - 25.10.15 = Charrua's X : 19.06.15 - 25.10.15. [Lisbon]: Centro de Arte Moderna Gulbenkian, 2015.
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Vigo, Universidade de. Sala X. Edited by Caldas Mar, Corbacho Valencia Juan Manuel, and Sala de exposicións Campus de Pontevedra, Facultade de Belas Artes. [Pontevedra]: Universidade de Vigo, Vicerreitoría do Campus de Pontevedra, 2014.
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Johnson, Jay Mark. X = time. Berlin: Galerie Deschler, 2008.
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Fonds régional d'art contemporain des Pays de la Loire, ed. X. Carquefou: FRAC des Pays de la Loire, 2021.
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Lahden julistebiennale (10th 1993 Julistemuseo). Lahden X julistebiennale. [Lahti]: Julistemuseo, 1993.
Знайти повний текст джерелаЧастини книг з теми "Exhibitions. x"
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Mireles, Ister, Iván A. Reyes, Francisco Patiño, Mizraim U. Flores, Juan Hernández, Sayra Ordoñez, and Martín Reyes. "Study of Behavioral about the Decomposition Reaction of the Solid Solution KFe3(SO4)2-x(CrO4)x(OH)6 in Ca(OH)2 Media." In TMS 2015 144th Annual Meeting & Exhibition, 1073–80. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48127-2_130.
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Pashniak, N., A. Abboud, S. Send, B. Dönges, A. K. Hüsecken, H. J. Christ, and U. Pietsch. "Application of Energy Dispersive PNCCD Detector in Material Science using hard X-Rays." In TMS 2015 144th Annual Meeting & Exhibition, 1339–44. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48127-2_159.
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Costanza, Girolamo, Francesco Mantineo, Andrea Sili, and Maria Elisa Tata. "Chacterization of Cu Tube Filled with al Alloy Foam by Means of X-Ray Computer Tomography." In TMS 2014: 143rd Annual Meeting & Exhibition, 613–20. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48237-8_74.
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Alvarez Montaño, Victor Emmanuel, Subhash Sharma, Francisco Brown, and Alejandro Durán. "Layered Ceramic Structures In1+x(Ti1/2Zn1/2)1-xO3(ZnO)m (m = 2, 4 and 6; x = 0.5): Synthesis, Phase Stability and Dielectric Properties." In TMS 2021 150th Annual Meeting & Exhibition Supplemental Proceedings, 375–82. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65261-6_34.
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Cooper, A. J., O. C. G. Tuck, T. L. Burnett, and A. H. Sherry. "Ductile Fracture Assessment of 304L Stainless Steel Using 3D X-ray Computed Tomography." In TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings, 737–54. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72526-0_70.
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Stepanov, N. D., D. G. Shaysultanov, G. A. Salishchev, M. A. Tikhonovsky, and O. N. Senkov. "Effect of Annealing on Phase Composition and Microstructure of the CoCrFeNiMnVx (x=0, 0.25, 0.5, 0.75, 1) High Entropy Alloys." In TMS 2015 144th Annual Meeting & Exhibition, 1157–64. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48127-2_140.
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Schenk, Thomas, Alain Jacques, Jean Briac Le Graverend, and Jonathan Cormier. "Real Time in Situ X-Ray Diffraction Study of the high Temperature Mechanical Behavior of a Rafted Single Crystal Superalloy." In TMS 2015 144th Annual Meeting & Exhibition, 1291–98. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48127-2_154.
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Lu, Xian Zheng, and Luen Chow Chan. "Construction of Representative Volume Element for Fe Simulation of Bulk Deformation of Stainless Steel Using X-Ray Computed Tomography Approach." In TMS 2015 144th Annual Meeting & Exhibition, 485–90. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48127-2_61.
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Aranas, Clodualdo, Samuel Rodrigues, Fulvio Siciliano, and John J. Jonas. "In-Situ X-Ray Diffraction Measurement During Deformation of Austenite Above the Ae3 Temperature." In TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings, 1789–98. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36296-6_165.
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Rocha, Adriana da Cunha, Maria C. Lopez Areiza, Sergio S. Tavares, and João Marcos A. Rebello. "Microstructural Evaluation of a Lean Duplex UNS S32304 — X-Ray Diffraction and Scanning Electron Microscopy Techniques Correlated with Eddy Current Testing." In TMS 2014: 143rd Annual Meeting & Exhibition, 741–49. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48237-8_88.
Повний текст джерелаТези доповідей конференцій з теми "Exhibitions. x"
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Malone, Robert, Stuart Baker, James Blackwell III, Daniel Clayton, Andrew Corredor, Morris Kaufman, David Phillips, Daniel Sorenson, Katherine Walters, and Eloisa Zepeda-Alarcon. "Combining visible shadowgraph imaging with x-ray imaging for dynamic shock experiments." In SPIE Optics + Photonics Conference, August 1–5, 2021, San Diego, California. https://spie.org/conferences-and-exhibitions/optics-and-photonics?SSO=1. US DOE, 2021. http://dx.doi.org/10.2172/1808789.
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Lakhtakia, Akhlesh, Vikas Vepachedu, and Patrick D. McAtee. "Non-exhibition of Bragg phenomenon by chevronic sculptured thin films." In Nanostructured Thin Films X, edited by Tom G. Mackay, Akhlesh Lakhtakia, and Yi-Jun Jen. SPIE, 2017. http://dx.doi.org/10.1117/12.2272835.
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Karaseva, A. R. "Contemporary Digital Projects in the Victorian Studies Art Exhibition Culture)." In X ИНФОРМАЦИОННАЯ ШКОЛА МОЛОДОГО УЧЕНОГО Екатеринбург, 19-22сентября 2022 г. Екатеринбург: ООО "Издательство УМЦ УПИ", 2022. http://dx.doi.org/10.32460/ishmu-2022-10-0017.
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Kumar, Rahul, and Kotaro Kajikawa. "Cylindrical hyperbolic metamaterials exhibiting superscattering with whispering gallery-like resonance." In Photonic and Phononic Properties of Engineered Nanostructures X, edited by Ali Adibi, Shawn-Yu Lin, and Axel Scherer. SPIE, 2020. http://dx.doi.org/10.1117/12.2543110.
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Maurer, Richard J., Sanjoy Mukhopadhyay, Johnny Grimes, Paul P. Guss, and Ronald E. Guise. "High fidelity ground deposition measurement with robots after explosive radiological dispersion." In SPIE Optics + Photonics Conference, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXV, 20–24 August 2023, San Diego, California, United States https://spie.org/conferences-and-exhibitions/optics-and-photonics. US DOE, 2023. http://dx.doi.org/10.2172/1992212.
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Muratore, C., A. A. Voevodin, J. J. Hu, and J. S. Zabinski. "Adaptive Nanocomposite Films Exhibiting Low Friction in a Broad Temperature Range." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63568.
Повний текст джерелаАнотація:
A hybrid magnetron sputtering/pulsed laser deposition process was used to grow nanocrystalline yttria stabilized zirconia (YSZ) embedded in an amorphous YSZ/metal matrix. This nanocomposite design reduced friction and improved the toughness of YSZ. Films containing both silver and molybdenum exhibited friction coefficients between 0.2 and 0.4 in air (40% relative humidity) against silicon nitride balls at temperatures between 25° C and 700 °C. Additional solid lubricants reduced the friction coefficient to <0.2 for over 10000 cycles at all temperatures. A multilayer film architecture was developed to further enhance the lifetime of the adaptive coatings. Electron microscopy, x-ray diffraction and x-ray photoelectron spectroscopy were used to correlate adaptive behavior at different temperatures to the composition and structure of the films.
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Pedulla, Joseph, Axel Bartos, and Richard D. Deslattes. "Dual Ion Beam Assisted Deposition for Multilayer Production." In Physics of X-Ray Multilayer Structures. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/pxrayms.1994.mc.5.
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Low pressure ion sputtering of certain materials utilizing Dual Ion Beam Assisted Deposition (DIBAD) techniques is known to produce high quality optical films.1 This process makes use of ion beam sputtering at pressures much lower than those encountered, for example, in magnetron sputtering and simultaneously polishes the deposition with a second, low energy ion beam.2,3,4,5 We have been using this method to produce diamond-like carbon films exhibiting high density, extreme hardness, high thermal conductivity, and uniform thickness over an area of 4.6 x 103 mm2.6 These characteristics stimulated us to investigate their use as the low electron density component of multilayer x-ray optical elements.
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Kubiak, Glenn D., Robert Q. Hwang, Michelle T. Schulberg, and Kathy R. Early. "Chemically Amplified Soft X-Ray Resists: Sensitivity, Resolution, and Molecular Photodesorption." In Soft X-Ray Projection Lithography. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/sxray.1992.wc2.
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Resists used for soft x-ray projection lithography must achieve high resolution and exhibit both high sensitivity and reasonable exposure latitude. Additionally, to prevent the deposition of highly-absorbing molecular species on multilayer-coated reflective optics, photon-induced desorption from the resist must be minimized. Chemically amplified resists show promise, exhibiting excellent sensitivity and resolution for e-beam and keV x-ray exposures[1-4], although they have not yet been characterized at wavelengths appropriate to soft x-ray projection lithography (SXPL). One often-noted issue regarding these resists is that the diffusion length of the photogenerated catalysts may limit their ultimate resolution[4]. Characterization of the diffusion length, and its dependence on the post-exposure bake temperature, has not been performed at SXPL wavelengths, however. Lastly, the beam-induced evolution of neutral and ionic molecular species from resists is a well-known phenomenon [5], although such desorption has not been studied for incident extreme ultraviolet (XUV) and soft x-ray radiation.
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Matos, Edielen, and Thais Soares. "X Journey." In Rio Pipeline Conference and Exhibition. IBP, 2023. http://dx.doi.org/10.48072/2447-2069.rpc.2023.185.
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Carbajo, Sergio, Tiffany Chang, Rares Fota, Alexandra Gilevich, Ariel Hart, Jack Hirschman, Alain Lacunza Huerta, et al. "Ultrafast Structured Light Architectures from THz to X-rays." In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_at.2023.jtu4e.6.
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We will review recent advances in ultrashort light wavepackets – from THz to X-rays – exhibiting spatio-temporal structure to enable emerging frontiers in ultrafast multi-modal quantum electrodynamics and coupled time-resolved techniques with attosecond time accuracy.
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1
Spanos, George. Neutron and X-ray Studies of Advanced Materials VII Symposium at the 143rd TMS Annual Meeting & Exhibition. Office of Scientific and Technical Information (OSTI), February 2015. http://dx.doi.org/10.2172/1169307.
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Porter, L. C., E. Appleman, M. A. Beno, C. S. Cariss, K. D. Carlson, H. Cohen, U. Geiser, R. J. Thorn, and J. M. Williams. Synthesis conductivity, and X-ray photoelectron spectrum of Bi sub 2 Sr sub 2 Cu sub 7+X. A new ternary bismuth-oxide system exhibiting metallic conductivity. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/5330355.
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Droby, Samir, Joseph W. Eckert, Shulamit Manulis, and Rajesh K. Mehra. Ecology, Population Dynamics and Genetic Diversity of Epiphytic Yeast Antagonists of Postharvest Diseases of Fruits. United States Department of Agriculture, October 1994. http://dx.doi.org/10.32747/1994.7568777.bard.
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One of the emerging technologies is the use of microbial agents for the control of postharvest diseases of fruits and vegetables. A number of antagonistic microorganisms have been discovered which have the potential to effectively control postharvest diseases. Some of this technology has been patented and commercial products such as AspireTM (Ecogen Corporatin, Langhorne, PA, USA), Biosave 10TM and Biosave 11TM (Ecoscience Inc., Worchester, MA, USA) have been registered for commercial use. The principal investigator of this project was involved in developing the yeast-based biofungicide-AspireTM and testing its efficacy under commercial conditions. This research project was initiated to fill the gap between the knowledge available on development and commercial implementation of yeast biocontrol agents and basic understanding of various aspects related to introducing yeast antagonists to fruit surfaces, along with verification of population genetics. The main objectives of this study were: Study ecology, population dynamics and genetic diversity of the yeast antagonists Candida guilliermondii, C. oleophila, and Debaryomyces hansenii, and study the effect of preharvest application of the yeast antagonist C. oleophila naturally occurring epiphytic microbial population and on the development of postharvest diseases of citrus fruit during storage. Our findings, which were detailed in several publications, have shown that an epiphytic yeast population of grapefruit able to grow under high osmotic conditions and a wide range of temperatures was isolated and characterized for its biocontrol activity against green mold decay caused by Penicillium digitatum. Techniques based on random amplified polymorphic DNA (RAPD) and arbitrary primed polymerase chain reaction (ap-PCR), as well as homologies between sequences of the rDNA internal transcribed spacers (ITS) and 5.8S gene, were used to characterize the composition of the yeast population and to determine the genetic relationship among predominant yeast species. Epiphytic yeasts exhibiting the highest biocontrol activity against P. digitatum on grapefruit were identified as Candida guilliermondii, C. oleophila, C. sake, and Debaryomyces hansenii, while C. guilliermondii was the most predominant species. RAPD and ap-PCR analysis of the osmotolerant yeast population showed two different, major groups. The sequences of the ITS regions and the 5.8S gene of the yeast isolates, previously identified as belonging to different species, were found to be identical. Following the need to develop a genetically marked strain of the yeast C. oleophila, to be used in population dynamics studies, a transformation system for the yeast was developed. Histidine auxotrophy of C. oloephila produced using ethyl methanesulfonate were transformed with plasmids containing HIS3, HIS4 and HIS5 genes from Saccharomyces cerevisiae. In one mutant histidin auxotrophy was complemented by the HIS5 gene of S. cerevisiae is functionally homologous to the HIS5 gene in V. oleophila. Southern blot analysis showed that the plasmid containing the S. cerevisiae HIS5 gene was integrated at a different location every C. oleophila HIS+ transformant. There were no detectable physiological differences between C. oleophila strain I-182 and the transformants. The biological control ability of C. oleophila was not affected by the transformation. A genetically marked (with b-glucuronidase gene) transformant of C. oleophila colonized wounds on orange fruits and its population increased under field conditions. Effect of preharvest application of the yeast C. oleophila on population dynamics of epiphytic microbial population on wounded and unwounded grapefruit surface in the orchard and after harvest was also studied. In addition, the effect of preharvest application of the yeast C. oleophila on the development of postharvest decay was evaluated. Population studies conducted in the orchard showed that in control, non-treated fruit, colonization of wounded and unwounded grapefruit surface by naturally occurring filamentous fungi did not vary throughout the incubation period on the tree. On the other hand, colonization of intact and wounded fruit surface by naturally occurring yeasts was different. Yeasts colonized wounded surface rapidly and increased in numbers to about two orders of magnitude as compared to unwounded surface. On fruit treated with the yeast and kept on the tree, a different picture of fungal and yeast population had emerged. The detected fungal population on the yeast-treated intact surface was dramatically reduced and in treated wounds no fungi was detected. Yeast population on intact surface was relatively high immediately after the application of AspireTM and decreased to than 70% of that detected initially. In wounds, yeast population increased from 2.5 x 104 to about 4x106 after 72 hours of incubation at 20oC. Results of tests conducted to evaluate the effect of preharvest application of AspireTM on the development of postharvest decay indicated the validity of the approach.
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Lers, Amnon, Majid R. Foolad, and Haya Friedman. genetic basis for postharvest chilling tolerance in tomato fruit. United States Department of Agriculture, January 2014. http://dx.doi.org/10.32747/2014.7600014.bard.
Повний текст джерелаАнотація:
ABSTRACT Postharvest losses of fresh produce are estimated globally to be around 30%. Reducing these losses is considered a major solution to ensure global food security. Storage at low temperatures is an efficient practice to prolong postharvest performance of crops with minimal negative impact on produce quality or human health and the environment. However, many fresh produce commodities are susceptible to chilling temperatures, and the application of cold storage is limited as it would cause physiological chilling injury (CI) leading to reduced produce quality. Further, the primary CI becomes a preferred site for pathogens leading to decay and massive produce losses. Thus, chilling sensitive crops should be stored at higher minimal temperatures, which curtails their marketing life and in some cases necessitates the use of other storage strategies. Development of new knowledge about the biological basis for chilling tolerance in fruits and vegetables should allow development of both new varieties more tolerant to cold, and more efficient postharvest storage treatments and storage conditions. In order to improve the agricultural performance of modern crop varieties, including tomato, there is great potential in introgression of marker-defined genomic regions from wild species onto the background of elite breeding lines. To exploit this potential for improving tomato fruit chilling tolerance during postharvest storage, we have used in this research a recombinant inbred line (RIL) population derived from a cross between the red-fruited tomato wild species SolanumpimpinellifoliumL. accession LA2093 and an advanced Solanum lycopersicumL. tomato breeding line NCEBR-1, developed in the laboratory of the US co-PI. The original specific objectives were: 1) Screening of RIL population resulting from the cross NCEBR1 X LA2093 for fruit chilling response during postharvest storage and estimation of its heritability; 2) Perform a transcriptopmic and bioinformatics analysis for the two parental lines following exposure to chilling storage. During the course of the project, we learned that we could measure greater differences in chilling responses among specific RILs compared to that observed between the two parental lines, and thus we decided not to perform transcriptomic analysis and instead invest our efforts more on characterization of the RILs. Performing the transcriptomic analysis for several RILs, which significantly differ in their chilling tolerance/sensitivity, at a later stage could result with more significant insights. The RIL population, (172 lines), was used in field experiment in which fruits were examined for chilling sensitivity by determining CI severity. Following the field experiments, including 4 harvest days and CI measurements, two extreme tails of the response distribution, each consisting of 11 RILs exhibiting either high sensitivity or tolerance to chilling stress, were identified and were further examined for chilling response in greenhouse experiments. Across the RILs, we found significant (P < 0.01) correlation between field and greenhouse grown plants in fruit CI. Two groups of 5 RILs, whose fruits exhibited reproducible chilling tolerant/sensitive phenotypes in both field and greenhouse experiments, were selected for further analyses. Numerous genetic, physiological, biochemical and molecular variations were investigated in response to postharvest chilling stress in the selected RILs. We confirmed the differential response of the parental lines of the RIL population to chilling stress, and examined the extent of variation in the RIL population in response to chilling treatment. We determined parameters which would be useful for further characterization of chilling response in the RIL population. These included chlorophyll fluorescence Fv/Fm, water loss, total non-enzymatic potential of antioxidant activity, ascorbate and proline content, and expression of LeCBF1 gene, known to be associated with cold acclimation. These parameters could be used in continuation studies for the identification and genetic mapping of loci contributing to chilling tolerance in this population, and identifying genetic markers associated with chilling tolerance in tomato. Once genetic markers associated with chilling tolerance are identified, the trait could be transferred to different genetic background via marker-assisted selection (MAS) and breeding. The collaborative research established in this program has resulted in new information and insights in this area of research and the collaboration will be continued to obtain further insights into the genetic, molecular biology and physiology of postharvest chilling tolerance in tomato fruit. The US Co-PI, developed the RIL population that was used for screening and measurement of the relevant chilling stress responses and conducted statistical analyses of the data. Because we were not able to grow the RIL population under field conditions in two successive generations, we could not estimate heritability of response to chilling temperatures. However, we plan to continue the research, grow the RIL progeny in the field again, and determine heritability of chilling tolerance in a near future. The IS and US investigators interacted regularly and plan to continue and expand on this study, since combing the expertise of the Co-PI in genetics and breeding with that of the PI in postharvest physiology and molecular biology will have great impact on this line of research, given the significant findings of this one-year feasibility project.