51 research outputs found
The other side of the social web: A taxonomy for social information access
Get PDFThe power of the modern Web, which is frequently called the Social Web or Web 2.0, is frequently traced to the power of users as contributors of various kinds of contents through Wikis, blogs, and resource sharing sites. However, the community power impacts not only the production of Web content, but also the access to all kinds of Web content. A number of research groups worldwide explore what we call social information access techniques that help users get to the right information using "collective wisdom" distilled from actions of those who worked with this information earlier. This invited talk offers a brief introduction into this important research stream and reviews recent works on social information access performed at the University of Pittsburgh's PAWS Lab lead by the author. Copyright © 2012 by the Association for Computing Machinery, Inc. (ACM)
Subdued Voices: Women Characters and Their Author in Inside the Haveli
No full textRama Mehta is an eminent novelist who contributed significantly to Indian English fiction by bringing female issues to the fore through her exemplary novel, Inside the Haveli. The novel shows a predominant concern with the subjugating condition of women characters shackled in the Indian patriarchal structure and brings, particularly, into light the repressed state of female characters and the elements that determine their submission. Simultaneously, based on the incident, the novel reveals silence and submission on the part of the novelist as well. Nevertheless, the work seems stifled when dealing with women's issues; its movements are confusing, contradicting and oscillating. The characters and their author appear tense under pressure showing a disinclination to adopt a bold stance. This cramped and oscillating situation speaks of their helplessness and repressed situation
Simulation of honeycomb–screen combinations for turbulence management in a subsonic wind tunnel
No full textPESI - a taxonomic backbone for Europe
Get PDFThis is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The attached file is the published version of the article.NHM Repositor
A Chiron Approach to the Total Synthesis of (−)-Juglomycin A, (+)-Kalafungin, (+)-Frenolicin B, and (+)-Deoxyfrenolicin
No full textA general, efficient, and common strategy for the synthesis
of
(−)-juglomycin A, (+)-kalafungin, (+)-frenolicin B, and (+)-deoxyfrenolicin
is reported here. The strategy involves the synthesis of a key building
block alkyne from a cheap chiral pool material, d-glucono-δ-lactone,
Dötz benzannulation, oxa-Pictet-Spengler reaction, and H2SO4-mediated epimerization
The Lightweight Design of a Dump Truck Frame based on Dynamic Responses
No full textThis paper develops a new scheme for the
lightweight design of heavy dump truck frames based on the
characteristics of dynamic responses. The dynamic response
is predicted using a finite element (FE) model which is
verified by an experimental mode analysis. The FE model is
then used to investigate the characteristics of dynamic
responses and frame weight changes with respect to the
mass changes of each frame component for selecting
significant components. An optimization is finally developed
for the lightweight design under constrains that maintain
required dynamic responses and static strength. The
optimization results show that the weight of frame can be
reduced by 8%, showing that the scheme is an effective way
to achieve automotive lightweight design
REPORT ON BEST PRACTICES FOR CITABILITY OF DATA AND ON EVOLVING ROLES IN SCHOLARLY COMMUNICATION
Get PDFThis report sets out the current thinking on data citation best practice and presents the results of a survey of librarians asking how new support roles could and should be developed
Field investigation of subgrade non-uniformity effects on concrete pavement
Get PDFThe traditional method of designing concrete pavements is through the assignment of a single modulus of subgrade reaction (k-value) to the soil for the section under consideration. It is well known that soil under pavement is not a homogenous, elastic, and isotropic half-space but varies spatially due to variations in the soil geological properties, environmental factors, and construction methods. Few studies have attempted to characterize this heterogeneous behavior as non-uniform subgrade support, theoretically analyze its effect on slab responses, or its effect on concrete pavement performance.
This research has collected geotechnical data from two roadway sections in Michigan, MI I-94 and MI I-96, to characterize the effects of the foundation layer spatial non-uniformity on tensile stress changes in a concrete slab. For both the MI I-94 and MI I-96 roadway section, k-values were correlated from field Dynamic Cone Penetrometer (DCP) tests that were either deterministically or randomly assigned to a predefined area size. These spatial plots were discretized into various uniform area sizes to compare tensile stresses from a non-uniform support under a concrete pavement to a uniform support condition. The individual area sizes varied from 0.7x0.7 m2 and 1.16x1.16 m2. A 2-D finite element program was used to analyze the critical slab tensile stresses for multiple uniform and non-uniform conditions subjected to three axle configurations, loading paths, and temperature differentials.
The results for MI I-94 stress analysis showed that the deterministic assignment of k-value from the field did not result in any significant increase in critical tensile stresses compared to the uniform support assumptions even for varying individual area sizes. However, when the k-value of the foundation layer was randomly assigned to these individual areas, using a normal distribution, for a soft subgrade (k-value = 63 psi/in and standard deviation = 25.6 psi/in), the overall peak tensile stresses along the edge loading path increased by 31% and the average peak tensile stress increased by 37%. The greatest increase in tensile stresses relative to the uniform support condition occurred for individual support areas of 1.16x1.16 m2. When the k-value was randomly assigned with a beta (B) distribution for a lower limit of 20 psi/in, there was no increase in the overall peak tensile stress in the slab relative to the uniform support condition. Although the section with stiffer soil (mean k-value = 397 psi/in), MI I-96, had a large range in measured k-values, it only increased the overall peak tensile stresses in the slab relative to uniform support conditions by 11% when randomly assigned to 81 k-value areas and increased the tensile stress by 6% when the k-values were deterministically assigned.
The field data and theoretical analysis presented in this research has shown that non-uniform support conditions can lead to significantly higher slab stresses under certain geometric, loading, and slab support conditions. Non-uniform support along the edge of the slab especially very low support values near the location of maximum tensile stress substantially increased the slab tensile stresses. These tensile stresses are further increased under daytime temperature curling. Variability in the foundation stiffness had a larger impact on slabs supported by softer soils relative to stiff soils. For the inputs analyzed in this study, the size of the individual area of uniform support defined around 1 m2 produced the greatest increase in tensile stress in the slab. Detection and treatment of areas of weak and variable support along the anticipated free edges of the slab are important to improving the performance of concrete pavements.Item withdrawn by Mark Zulauf ([email protected]) on 2012-08-23T20:18:55Z
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license.txt: 4062 bytes, checksum: beb833d24ee398d09aacf3dcdf5c337e (MD5)Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Seth Robbins ([email protected]) on 2013-02-03T19:19:05Z
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Original Data
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Release Date: 2015-02-03 13:18:53 UTC
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Only Restriction Lifted for Item 42110 on 2015-02-03T11:01:02Z
Elevated CO2 alleviates the negative impact of heat stress on wheat physiology but not on grain yield
Get PDFTausz, M ORCiD: 0000-0001-8205-8561Hot days are becoming hotter and more frequent, threatening wheat yields worldwide. Developing wheat varieties ready for future climates calls for improved understanding of how elevated CO2 (eCO2) and heat stress (HS) interactively impact wheat yields. We grew a modern, high-yielding wheat cultivar (Scout) at ambient CO2 (aCO2, 419 μl l -1) or eCO2 (654 μl l-1) in a glasshouse maintained at 22/15 °C (day/night). Half of the plants were exposed to HS (40/24 °C) for 5 d at anthesis. In non-HS plants, eCO2 enhanced (+36%) CO2 assimilation rates (Asat) measured at growth CO2 despite down-regulation of photosynthetic capacity. HS reduced Asat (-42%) in aCO2- but not in eCO2-grown plants because eCO2 protected photosynthesis by increasing ribulose bisphosphate regeneration capacity and reducing photochemical damage under HS. eCO2 stimulated biomass (+35%) of all plants and grain yield (+30%) of non-HS plants only. Plant biomass initially decreased following HS but recovered at maturity due to late tillering. HS equally reduced grain yield (-40%) in aCO2- and eCO2-grown plants due to grain abortion and reduced grain filling. While eCO2 mitigated the negative impacts of HS at anthesis on wheat photosynthesis and biomass, grain yield was reduced by HS in both CO2 treatments. © 2019 The Author(s)
Role of trace elements as cofactor: An efficient strategy towards enhanced biobutanol production
No full textMetabolic engineering has potential to steadily enhance product titers by inducing changes in metabolism. Especially, availability of cofactors plays a crucial role in improving efficacy of product conversion. Hence, the effect of certain trace elements was studied individually or in combinations, to enhance butanol flux during its biological production. Interestingly, nickel chloride (100 mg L-1) and sodium selenite (1 mg L-1) showed nearly two-fold increase in solvent titer, achieving 16.13±0.24 and 12.88±0.36 g L-1 total solvents with yield of 0.30 and 0.33 g g-1, respectively. Subsequently, addition time (screened entities) was optimized (8 h) to further increase solvent production up to 18.17±0.19 and 15.5±0.13 g L-1 by using nickel and selenite, respectively. A significant upsurge in butanol dehydrogenase (BDH) levels was observed, which reflected in improved solvent productions. Additionally, a three-dimensional structure of BDH was also constructed using homology modeling and subsequently docked with substrate, cofactor and metal ion to investigate proper orientation and molecular interactions.Peer reviewe
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