Bargaining over Public Goods

In a simple public good economy, we propose a natural bar- gaining procedure, the equilibria of which converge to Lin- dahl allocations as the cost of bargaining vanishes. The pro- cedure splits the decision over the allocation in a decision about personalized prices and a decision about output levels for the public good. Since this procedure does not assume price-taking behavior, it provides a strategic foundation for the personalized taxes inherent in the Lindahl solution to the public goods problem.public goods; alternating offers bargaining

On the low energy limit of one loop photon-graviton amplitudes

We present first results of a systematic study of the structure of the low energy limit of the one-loop photon-graviton amplitudes induced by massive scalars and spinors. Our main objective is the search of KLT-type relations where effectively two photons merge into a graviton. We find such a relation at the graviton-photon-photon level. We also derive the diffeomorphism Ward identity for the 1PI one graviton - N photon amplitudes.Comment: 14 pages, 1 figure. Final version to be published in Physics Letters

Estudios de acoplamiento molecular de nuevos análogos de quinolonas a la ADN girasa de Escherichia coli

Indexación: Scopus.Chemicals and CAS Registry Numbers: amino acid, 65072-01-7; ciprofloxacin, 85721-33-1; DNA topoisomerase (ATP hydrolysing); gatifloxacin, 112811-59-3, 180200-66-2; levofloxacin, 100986-85-4, 138199-71-0; lomefloxacin, 98079-51-7; moxifloxacin, 151096-09-2; nalidixic acid, 389-08-2; oxolinic acid, 14698-29-4; pipemidic acid, 51940-44-4; rufloxacin, 101363-10-4; sitafloxacin, 127254-12-0, 163253-35-8Context: Bacterial resistance to antibiotics is the inevitable consequence of the use of antimicrobial agents. Thus, quinolones are an important class of antibacterials; these agents generally consist of a 1-subtituted-1,4-dihydro-4-oxopyridine-3-carboxylic acid moiety combined with an aromatic or heteroaromatic ring fused at the 5- and 6-position. Aims: To determine the binding of quinolones to DNA gyrase of Escherichia coli. Methods: An analysis was performed using an in silico approach to determine, by docking calculations and energy descriptors, the conformer of 4‐oxo‐1,4‐dihydroquinoline skeleton that forms the most stable complex with DNA gyrase of E. coli. Results: The complex shows that the pose of the quinolones coincides with the amino acid residues Asp87, Thr88, Arg91 and Met92, which is expected to be critical in the binding of quinolones to DNA gyrase of E. coli. A series of quinolones were computationally designed, and the interactions between the quinolones and the amino acid residues of the DNA gyrase were calculated. Conclusions: Among the designed compounds, compounds 105 and 115 exhibit higher binding energy values and interact with amino acids Asp87, Thr88, Arg91 and Met92. © 2018 Journal of Pharmacy & Pharmacognosy Research.http://jppres.com/jppres/pdf/vol6/jppres18.368_6.5.386.pd

Evaluation of the geotechnical behaviour of a volcanic soil wall with additions of lime and cement against landslides

The construction of earth walls can be a significant response to prevent the next landslides from reaching the road and avoid accidents. Therefore, a material of the same slope was used and reinforced with mixtures of lime and cement, with this same reinforced material a mechanically stabilized hypothetical earth wall (MSE) was developed. An analysis of the original slope was developed to check if there was a possible failure through its safety factor. Then, a hypothetical wall was developed with a floor reinforced with mixtures, in order to assess its overall safety factor and its maximum landslides. According to the results, in principle it was determined that the dosage M-3 / C-4-4 improves in a range of 30% to 37% the friction angle. In addition, it was found that a reinforced wall, that is to say with Lime and cement additions, presents a better behaviour. In its effect, its displacements are about 8 mm and have a global factor of 1.23

Two-Photon Excitation of Cesium Alkali Metal Vapor 7\u3csup\u3e2\u3c/sup\u3eD, 8\u3csup\u3e2\u3c/sup\u3eD Kinetics and Spectroscopy

Pulsed excitation on the two-photon Cs 62S½ → 72D3/2,5/2 transition results in time-resolved fluorescence at 697 nm and 672 nm. The rates for fine structure mixing between the 72D3/2,5/2 states have been measured for helium and argon rare gas collision partners. The mixing rates are very fast, 1.26 ± 0.05 x 10-9 cm3/(atom sec) for He and 1.52 ± 0.05 x 10-10 cm3 /(atom sec) for Ar, driven by the small energy splitting and large radial distribution for the valence electron. The quenching rates are considerably slower, 6.84 ± 0.09 x 10-11 cm3 /(atom sec) and 2.65 ± 0.04 x 10-11 cm3 /(atom sec) for He and Ar, respectively. The current results are placed in context with similar rates for other alkali-rare gas collision pairs using adiabaticity arguments. Pulsed excitation on the two-photon Cs 6 2S1/2 → 8 2D3/2, 5/2 transition results in time-resolved fluorescence at 601 nm. The rates for fine structure mixing between the 8 2D3/2, 5/2 states have been measured for helium and argon rare gas collision partners. The mixing rates are very fast, 2.6 ± 0.2 x 10-9 cm3/(atom s) for He and 5.2 ± 0.4 x 10-10 cm3/(atom s) for Ar, about 2-3 times faster than for the Cs 7 2D5/2 ↔ 7 2D3/2 relaxation. The quenching rates are also rapid, 1.07 ± 0.04 x 10-10 cm3/(atom s) and 9.5 ± 0.7 x 10-11 cm3/(atom s) for He and Ar, respectively. The rapid fine structure rates are explained by the highly impulsive nature of the collisions and the large average distance of the valence electron from the nucleus. Quenching rates (intermultiplet transfer) are likely enhanced by the closely spaced, 9 2P levels. Stimulated emission on the ultraviolet and blue transitions in Cs has been achieved by pumping via two-photon absorption for the pump transition 62S 1/2 → 72D5/2,3/2. The performance of the optically-pumped cesium vapor laser operating in ultraviolet and blue has been extended to 650 nJ/pulse for 387 nm, 1.3 µJ/pulse for 388 nm, 200 nJ/pulse for 455 nm and 500 nJ/pulse for 459 nm. Emission performance improves dramatically as the cesium vapor density is increased and no scaling limitations associated with energy pooling or ionization kinetics have been observed

No hay Sólo un Idioma, No hay Sólo una Voz: A Revisionist History of Chicana/os and Latina/os in Punk

Through a media historical analysis of Chicana/o and Latina/o participation in punk scenes in cities such as Los Angeles and Chicago, this dissertation decenters whiteness as the taken-for-granted subject position within punk and problematizes existing scholarship that assigns a unified and coherent political ideology to Latina/o punks. This work follows Fiona I.B. Ngò and Elizabeth A. Stinson’s imperative to excavate punk’s past and present in order to “rewrit[e] the idea of margin and center” within punk historiography and scholarship, and extends Mimi Thi Nguyen’s arguments against the periodization of women of color feminisms in punk as “timely but also temporary” interventions during moments of crises to include Chicana/o and Latina/o involvement in punk. By tracking the development and evolution of punk scenes in predominantly Latina/o and working-class areas of Los Angeles and Chicago over the span of approximately forty years, I insist upon the continuous co-presence of Latina/os (as well as other people of color) in punk, and the importance of critically engaging questions of race, class, nation, and power in punk’s past and present. I also argue against a singular notion of “Chicano Punk,” in which all participants in predominately Chicana/o and Latina/o punk scenes are assumed to hold similar motivations, objectives, ideologies, and aesthetic sensibilities. Examining multiple scenes across several decades reveals instead a complex and sometimes contradictory history of Latina/o participation in American punk scenes, with widely varying politics and aspirations across decades and even within individual scenes. Rather than attempt to make a grand argument about nearly forty years of “Chicano Punk,” it is more fruitful to look closely at several individual scenes in order to explore how discourses of race, as well as social, political, and economic factors shape Latina/os’ relationships to punk at particular times and in particular places. Though the conclusions I draw are largely specific to the particular scenes under examination, my study demonstrates the need to reexamine punk’s complicated relationship to race and points to several areas of inquiry through which a reexamination may be achieved