97,868 research outputs found
Crafting democracies: Professor Abe Lowenthal and Sean Burges
No full textAuthoritarian regimes are under siege in many parts of the world. Some have already given way and others are likely to follow. Building democracies in their place will not be easy or quick, and in some cases it will not happen in the medium term. Much has been learned about how to organize free and fair elections, but building the other institutions and the habits of democratic governance inevitably takes time. Some countries in transition face intense divisions that make democracy challenging to achieve.
In this video, Professor Abraham F (Abe) Lowenthal from the University of Southern California speaks with Dr Sean Burges, Lecturer in International Relations and Deputy Director of the ANU Centre for Latin American Studies about what we can learn from those countries which have been through this transition to democracy.
 
Shriners Jack Shytles, F. C. Johnson, and Abe A. Mehl
No full textJack Shytles, 3327 University drive, right, about to miss his first Shrine trip in 27 years, is comforted by F. C. Johnson, 4124 Anita, left, and Abe A. Mehl, 3649 South Hills. Group departed from T&P Station for a two-day All-State Ceremonial in Amarillo. The man at far left is unidentified. All of the men are wearing fez hats and members of the Moslah drum corps.https://mavmatrix.uta.edu/specialcollections_startelegram1950s/14343/thumbnail.jp
ABE Cubed: Advanced Benchmarking Extensions for ABE Squared
No full textSince attribute-based encryption (ABE) was proposed in 2005, it has established itself as a valuable tool in the enforcement of access control. For practice, it is important that ABE satisfies many desirable properties such as multi-authority and negations support. Nowadays, we can attain these properties simultaneously, but none of these schemes have been implemented. Furthermore, although simpler schemes have been optimized extensively on a structural level, there is still much room for improvement for these more advanced schemes. However, even if we had schemes with such structural improvements, we would not have a way to benchmark and compare them fairly to measure the effect of such improvements. The only framework that aims to achieve this goal, ABE Squared (TCHES \u2722), was designed with simpler schemes in mind.
In this work, we propose the ABE Cubed framework, which provides advanced benchmarking extensions for ABE Squared. To motivate our framework, we first apply structural improvements to the decentralized ciphertext-policy ABE scheme supporting negations presented by Riepel, Venema and Verma (ACM CCS \u2724), which results in five new schemes with the same properties. We use these schemes to uncover and bridge the gaps in the ABE Squared framework. In particular, we observe that advanced schemes depend on more variables that affect the schemes\u27 efficiency in different dimensions. Whereas ABE Squared only considered one dimension (as was sufficient for the schemes considered there), we devise a benchmarking strategy that allows us to analyze the schemes in multiple dimensions. As a result, we obtain a more complete overview on the computational efficiency of the schemes, and ultimately, this allows us to make better-founded choices about which schemes provide the best efficiency trade-offs for practice
ABE Cubed: Advanced Benchmarking Extensions for ABE Squared
No full textSince attribute-based encryption (ABE) was proposed in 2005, it has established itself as a valuable tool in the enforcement of access control. For practice, it is important that ABE satisfies many desirable properties such as multi-authority and negations support. Nowadays, we can attain these properties simultaneously, but none of these schemes have been implemented. Furthermore, although simpler schemes have been optimized extensively on a structural level, there is still much room for improvement for these more advanced schemes. However, even if we had schemes with such structural improvements, we would not have a way to benchmark and compare them fairly to measure the effect of such improvements. The only framework that aims to achieve this goal, ABE Squared (TCHES ’22), was designed with simpler schemes in mind.In this work, we propose the ABE Cubed framework, which provides advanced benchmarking extensions for ABE Squared. To motivate our framework, we first apply structural improvements to the decentralized ciphertext-policy ABE scheme supporting negations presented by Riepel, Venema and Verma (ACM CCS ’24), which results in five new schemes with the same properties. We use these schemes to uncover and bridge the gaps in the ABE Squared framework. In particular, we observe that advanced schemes depend on more “variables” that affect the schemes’ efficiency in different dimensions. Whereas ABE Squared only considered one dimension (as was sufficient for the schemes considered there), we devise a benchmarking strategy that allows us to analyze the schemes in multiple dimensions. As a result, we obtain a more complete overview on the computational efficiency of the schemes, and ultimately, this allows us to make better-founded choices about which schemes provide the best efficiency trade-offs for practice
Abe Springs Bluff Courthouse Marker (Reverse), Calhoun Co, FL
No full textThe marker reads: ABE SPRINGS BLUFF COURTHOUSE -- (Continued from other side) From 1845 to 1847 the Florida Legislature tried unsuccessful to re-establish a county seat. Finally, in 1848 Calhoun Countians voted on proposed locations and, the following January, Abe Springs Bluff -- a more centrally located inland site -- was officially declared the county seat. Unlike its ill-fated predecessor, Abe Springs Bluff never was a true community -- just a courthouse site. In 1880 the Abe Springs Bluff courthouse was destroyed by fire and the county seat was moved to the new community of Blountstown on the Apalachicola River. SPONSORED BY THE FLORIDA DEPARTMENT OF STATE 1993 F-347 Top of the sign: Image of the Great Seal of the State of Florida – In God We Trusthttps://digitalcommons.unf.edu/historical_architecture_main/8367/thumbnail.jp
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Conditioning of SO2-ethanol-water (SEW) spent liquor from lignocellulosics for ABE fermentation to biofuels and chemicals
No full textThis thesis introduces a biorefinery process to fractionate lignocellulosics followed by treatment of the produced hydrolysate for microbial fermentation to acetone, butanol and ethanol (ABE). The process utilizes SO2-Ethanol-Water (SEW) fractionation technology and a ‘conditioning’ protocol to treat SEW spent liquor for ABE fermentation by Clostridia bacteria.
It is found that SEW fractionation of spruce chips, mixed softwood biomass and Oil Palm Empty Fruit Bunch (OPEFB) at conditions of 12% SO2 in 55 v/v% ethanol-water, liquor-to-feedstock (L/F) ratio of 3 L kg-1, 150°C, 30 min, is suitable for industrial scale application. SEW fractionation is followed by pulp washing and ‘conditioning’ to detoxify the spent liquor and to increase its monosugars content. The ‘conditioning’ scheme in its basic form comprises of the consecutive steps of vacuum evaporation, steam stripping, liming and catalytic oxidation.
‘Conditioning’ successfully removes most ABE fermentation inhibitors for Clostridia. It also allows almost total recovery of the cooking chemicals (ethanol and SO2) leading to an economical and environmentally benign process. Levels of residual inhibitory dissolved lignin in the final conditioned liquors correspond to only about 10% of the original lignin in the respective feedstocks. However, these levels are still too high for microbial ABE fermentation and therefore additional treatment with anion exchange resins followed by 4-fold dilution is employed before ABE fermentation to reach dissolved lignin levels of approximately 1 g L-1 (tolerance limit for Clostridia). All the different feedstock-based hydrolysates that are produced after ‘conditioning’ are fermentable by Clostridia and ABE solvents (mostly butanol) are produced at satisfactory total concentration and yield.
Hydrolysis of OPEFB fibers in particular is impaired (compared to spruce) due to their high ash/alkali metals content. Acidic leaching of this feedstock did not remove sufficient amounts of metal cations leading to only marginally improved hydrolysis. However, it is possible to improve hydrolysis of this feedstock by adding inorganic acids (nitric, phosphoric) in the fresh fractionation liquor at a level to provide the required nutrients for Clostridia.
Finally, it is demonstrated that by introducing some small modifications to the basic SEW spent liquor ‘conditioning’ scheme and by performing nanofiltration instead of resins treatment it is possible to reach lower dissolved lignin levels (below 1 g L-1 upon 4-fold dilution) in the feed liquor for fermentation. Furthermore, it is possible to significantly improve the production of solvents and ABE fermentation yield; total solvents concentration increases from 7 to 11 g L-1, yield increases from 0.26 to 0.30 g g-1 sugars
ABE fermentation performance with different operation strategies.
No full text<p><b>(A)</b> ABE fermentation by <i>C</i>. <i>acetobutylicum</i> (control, case #a). <b>(B)</b> ABE fermentation by <i>C</i>. <i>acetobutylicum</i> with exogenous butyrate addition (case #b). <b>(C)</b> ABE fermentation by co-culturing <i>C</i>. <i>acetobutylicum</i>/<i>S</i>. <i>cerevisiae</i> (case #c). <b>(D)</b> ABE fermentation by co-culturing <i>C</i>. <i>acetobutylicum</i>/<i>S</i>. <i>cerevisiae</i> in coupling with exogenous butyrate addition (case #d). ●: butanol; ■: acetone; ▲: ethanol; ▽: butyrate; ○: glucose. <b>(E)</b>-<b>(F)</b> Change patterns of pH and gas production with different operation strategies. Thin line: case #a (control); dash dot line: case #b; broken line: case #c; bold line: case #d. Dashed arrow: the instant of initiating the consecutive butyrate additions (case #b); solid arrow: the instant of adding <i>S</i>. <i>cerevisiae</i> culture broth (case #c) and <i>S</i>. <i>cerevisiae</i> culture broth/concentrated butyrate solution (case #d).</p
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