1,074 research outputs found
Xinjiang (China), landscape in Tarim Basin
No full text"Rundhöċken" landscape in Ulugh-art-tagh. Absol. altitude c. 3000 m or c. 10,000 feet.Image is part of research conducted by Erik Norin for the article: Quaternary Climatic Changes within the Tarim Basin
Author(s): Erik Norin
Source: Geographical Review, Vol. 22, No. 4 (Oct., 1932), pp. 591-598
Published by: American Geographical Society
Stable URL: http://www.jstor.org/stable/208816http://www.jstor.org/stable/208816Grayscal
Xinjiang (China), view of mountains with lateral moraine and ground moraine
No full textLateral moraine and ground moraine of the "Chunak" phase, Upper Done, the mouth of the Chong-yailak-jilgha. Absolute altitude - 3150 m. or c. 10,400 feet.Image is part of research conducted by Erik Norin for the article: Quaternary Climatic Changes within the Tarim Basin
Author(s): Erik Norin
Source: Geographical Review, Vol. 22, No. 4 (Oct., 1932), pp. 591-598
Published by: American Geographical Society
Stable URL: http://www.jstor.org/stable/208816http://www.jstor.org/stable/208816Grayscal
Optimizing Cadences with Realistic Light-curve Filtering for Serendipitous Kilonova Discovery with Vera Rubin Observatory
No full textCurrent and future optical and near-infrared wide-field surveys have the potential to find kilonovae, the optical and infrared counterparts to neutron star mergers, independently of gravitational-wave or high-energy gamma-ray burst triggers. The ability to discover fast and faint transients such as kilonovae largely depends on the area observed, the depth of those observations, the number of revisits per field in a given time frame, and the filters adopted by the survey; it also depends on the ability to perform rapid follow-up observations to confirm the nature of the transients. In this work, we assess kilonova detectability in existing simulations of the Legacy Survey of Space and Time strategy for the Vera C. Rubin Wide Fast Deep survey, with focus on comparing rolling to baseline cadences. Although currently available cadences can enable the detection of >300 kilonovae out to ∼1400 Mpc over the 10 year survey, we can expect only 3–32 kilonovae similar to GW170817 to be recognizable as fast-evolving transients. We also explore the detectability of kilonovae over the plausible parameter space, focusing on viewing angle and ejecta masses. We find that observations in redder izy bands are crucial for identification of nearby (within 300 Mpc) kilonovae that could be spectroscopically classified more easily than more distant sources. Rubin's potential for serendipitous kilonova discovery could be increased by gain of efficiency with the employment of individual 30 s exposures (as opposed to 2 × 15 s snap pairs), with the addition of red-band observations coupled with same-night observations in g or r bands, and possibly with further development of a new rolling-cadence strategy.</p
Surface functionalized N-C-TiO2/C nanocomposites derived from metal-organic framework in water vapour for enhanced photocatalytic H2 generation
No full textSurface-functionalized nitrogen/carbon co-doped polymorphic TiO2 phase junction nanoparticles uniformly distributed in porous carbon matrix were synthesized by a simple one-step pyrolysis of titanium based metal–organic framework (MOF), NH2-MIL-125(Ti) at 700 °C under water vapour atmosphere. Introducing water vapour during the pyrolysis of NH2-MIL-125(Ti) not only functionalizes the derived porous carbon matrix with carboxyl groups but also forms additional oxygen-rich N like interstitial/intraband states lying above the valence band of TiO2 along with the self-doped carbon, which further narrows the energy band gaps of polymorphic TiO2 nanoparticles that enhance photocatalytic charge transfer efficiency. Without co-catalyst, sample N-C-TiO2/CArW demonstrates H2 evolution activity of 426 µmol gcat-1 h−1, which remarkably outperforms commercial TiO2 (P-25) and N-C-TiO2/CAr with a 5-fold and 3-fold H2 generation, respectively. This study clearly shows that water vapour atmosphere during the pyrolysis increases the hydrophilicity of the Ti-MOF derived composites by functionalizing porous carbon matrix with carboxylic groups, as well as enhancing the electrical conductivity and charge transfer efficiency due to the formation of additional localized oxygen-rich N like interstitial/intraband states. This work also demonstrates that by optimizing the anatase–rutile phase composition of the TiO2 polymorphs, tuning the energy band gaps by N/C co-doping and functionalizing the porous carbon matrix in the N-C-TiO2/C nanocomposites, the photocatalytic H2 generation activity can be further enhanced
Portare Aldilà? Erik Peterson e la critica della teologia politica di C. Schmitt
No full textIn his essay, the author analyses Erik Peterson’s early work, more closely The Monotheism as Political Problem, to try to understand more accurately his critic to Carl Schmitt’s Political Theology. This entails also a reconsideration of Peterson’s Theological Tractates (recently published in english by Michael J. Hollerich): their solid and acknowledged philological and historical grounding did not impede a strong stance towards their times (i.e. the mid-30s in Germany), and shows the use of tools nonetheless – such as that of Übertragung (transfer) – which are relevant within the current debate on Political Theolog
The Use of Unmanaged Code in C# Language
No full textDiplomová práce zkoumá a popisuje možnosti využití unmanaged kódu pomocí programovacího jazyka C# v řízeném prostředí Common Language Runtime (CLR). Práce se skládá celkem z pěti částí. Teoretická část se převážně věnuje rozboru toho, jak CLR pracuje s pamětí. Dále jsou krátce rozebrány způsoby interoperability mezi řízeným a neřízeným kódem a stručně je popsána datová struktura, která byla využita při testování. V praktické části je za použití jazyků C#, C a C++ a technologií Platform Invoke a C++/CLI realizovaná komunikace mezi řízeným a nativním kódem. Dále jsou popsány nejužitečnější části jednotlivých implementací. Následuje grafická prezentace a porovnání testů navržených implementací. V závěru práce jsou vyhodnoceny výsledky testů a je uvedeno doporučení pro správné používání interoperability v .NET.This diploma thesis explores and describes the ways of using unmanaged code by the C# programming language in the managed Common Language Runtime (CLR) environment. The theoretical part is mainly devoted how CLR works with memory. Further, the methods of interoperability between managed and native code are briefly discussed. Farther the data structure that using in tests is briefly described. The second part is practical, in which is implemented the communication between managed and native code, using C#, C and C++ with Platform Invoke and C ++/CLI technologies. Then author describes the most useful parts of each implementations and graphically presents results of his own tests and their comparisons. At the end of this thesis, the author evaluates the most impotent test results and give his recommendations for the correct use of interoperability in .NET.Ústav informatiky a umělé inteligenc
I. Synthesis of Aryl C-Nucleosides and Retinoid Analogs II. Investigation into Docking Studies of Bisabosqual Analogs
No full textCurrently, there are three major approaches used for the synthesis of aryl C-2-deoxyriboses. The first approach uses a common sugar derivative developed by Kool, 1,2-dideoxy-3,5-O-p-toluoyl-alpha-1-chloro-D-ribofuranose. The second approach uses Woski\u27s 2-deoxyribonolactone glycal. The third approach uses a functionalize sugar involving tin reagents developed by Daves. All three methods have certain drawbacks. In efforts to finding a more efficient and alternative approach to making aryl C-deoxynucleosides, we developed a nine step synthetic route from commercially available inexpensive starting materials. In humans, epidermal keratinocytes are unique in their ability to convert Vitamin A1 (retinol) into Vitamin A2 (3,4-didehydroretinol). Each of these alcohols can be further metabolized to generate retinoid acids which serve as transcription factor ligands which can alter epidermal homeostasis. Currently unknown are the panel of genes which each of these ligands modulates. As a prerequisite for assessing the impact of each acid, their metabolism must be compared. For these purposes 3,4-didehydroretinoic acid and 3H-3,4-didehydroretinoic acid were synthesized. One important step in the biosynthesis involving the formation of cholesterol is the NADPH-requiring enzyme squalene synthase. Recently, four new squalene synthase inhibitors were found, they are Bisbosqual A, B, C and D. Using Discovery Studio from Accelrys, protein ligand docking studies were carried out on Bisabosqual A,B,C and D to understand the IC50 data reported by Minagawa. Insights into these studies were used to design Bisabosqual analogs for future synthesis
K-theory for group C*-algebras
No full textThese notes are based on a lecture course given by the first author in the Sedano Winter School on K-theory held in Sedano, Spain, on January 22-27th of 2007. They aim at introducing K-theory of C*-algebras, equivariant K-homology and KK-theory in the context of the Baum-Connes conjectur
Polyacrylamide hydrogel friction controlled by time-dependent surface energy due to poroelastic relaxation
No full textThis thesis explores the control of friction by varying contact area, contact time, and sliding speed of polyacrylamide hydrogel. With a comprehensive understanding of the phenomenon, hydrogels could be designed with targeted friction behavior, and be used to design surfaces for tissue engineering and drug delivery. Polyacrylamide gels were tested to quantify how the coefficient of friction changes under different conditions. Unlike common single-phase materials, hydrogels store water within a hydrophilic polymer matrix, in which the fluid can flow under applied pressure. It is known that this mass transfer contributes to lubrication, though there is not yet a direct connection. We find that mass transfer results in a local concentration of polymer, adhering and increasing the energy needed to move contacting surfaces. The final result is a coefficient of friction which depends on sliding speed, diffusivity, elastic modulus, applied load, and surface energy.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2018-05-01The student, Erik Reale, accepted the attached license on 2016-04-27 at 22:21.The student, Erik Reale, submitted this Thesis for approval on 2016-04-27 at 22:31.This Thesis was approved for publication on 2016-04-28 at 13:04.DSpace SAF Submission Ingestion Package generated from Vireo submission #9563 on 2016-07-07 at 14:18:09Made available in DSpace on 2016-07-07T21:18:10Z (GMT). No. of bitstreams: 2
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Previous issue date: 2016-04-28Embargo set by: Seth Robbins for item 93327
Lift date: 2018-07-07T21:18:16Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemLimited Restriction Lifted for Item 93327 on 2018-07-08T09:15:23Z
Atomistic simulation of carbide formation in ferrite
No full textIn this study possible routes from dissolved M and C atoms to a M-C (M = Ti, Nb) cluster are studied. Using atomistic modelling to perform relaxation simulations and molecular dynamics (MD) simulations for the Fe-M-C ternary system, the formation of clusters is studied for M. Additionally the stability of M-C clusters is assessed. The clustering of M and C atoms as observed in experiments is also found in simulations. The initial clusters found in this work have a (Fe,M)C composition with a large Fe fraction. Moreover, structurally relaxed clusters reveal that there are growth pathways with a monotone decrease in Gibbs energy, suggesting that the highest energy barrier in the formation of M-C clusters is the diffusion barrier for the atoms forming the cluster. The development of M-C clusters as found in this study suggests a formation mechanism for nano-precipitation of carbides consisting of several steps; first a C cluster forms, then M atoms attach to the C cluster forming a (Fe,M)C cluster, and in the final step the (Fe,M)C cluster transforms to a NaCl-structured carbide.Team Marcel SluiterTeam Erik Offerma
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