36 research outputs found
Factorizations for quasi-Banach time-frequency spaces and Schatten classes [Elektronisk resurs]
No full textWe deduce factorization properties for Wiener amalgam spaces WLp,q, an extended family of modulation spaces M(omega, B), and for Schatten symbols s(p)(w) in pseudo-differential calculus under e. g. convolutions, twisted convolutions and symbolic products. Here M(omega, B) can be any quasi-Banach Orlicz modulation space. For example we show that WL1,r * WLp,q = WLp,q and WL1,r#s(p)(w) = s(p)(w) when r is an element of (0, 1], r _= p, q _ infinity. In particular we improve Rudin's identity L-1 * L-1 = L-1. (c) 2024 The Author(s). Published by Elsevier B.V. on behalf of Royal Dutch Mathematical Society (KWG).</p
“Candidatus Galacturonibacter soehngenii” Shows Acetogenic Catabolism of Galacturonic Acid but Lacks a Canonical Carbon Monoxide Dehydrogenase/Acetyl-CoA Synthase Complex
No full textAcetogens have the ability to fixate carbon during fermentation by employing the Wood-Ljungdahl pathway (WLP), which is highly conserved across Bacteria and Archaea. In a previous study, product stoichometries in galacturonate-limited, anaerobic enrichment cultures of “Candidatus Galacturonibacter soehngenii,” from a novel genus within the Lachnospiraceae, suggested the simultaneous operation of a modified Entner-Doudoroff pathway for galacturonate fermentation and a WLP for acetogenesis. However, a draft metagenome-assembled genome (MAG) based on short reads did not reveal homologs of genes encoding a canonical WLP carbon-monoxide-dehydrogenase/acetyl-Coenzyme A synthase (CODH/ACS) complex. In this study, NaH13CO3 fed to chemostat-grown, galacturonate-limited enrichment cultures of “Ca. G. soehngenii” was shown to be incorporated into acetate. Preferential labeling of the carboxyl group of acetate was consistent with acetogenesis via a WLP in which the methyl group of acetate was predominately derived from formate. This interpretation was further supported by high transcript levels of a putative pyruvate-formate lyase gene and very low transcript levels of a candidate gene for formate dehydrogenase. Reassembly of the “Ca. G. soehngenii” MAG with support from long-read nanopore sequencing data produced a single-scaffold MAG, which confirmed the absence of canonical CODH/ACS-complex genes homologs. However, high CO-dehydrogenase activities were measured in cell extracts of “Ca. G. soehngenii” enrichment cultures, contradicting the absence of corresponding homologs in the MAG. Based on the highly conserved amino-acid motif associated with anaerobic Ni-CO dehydrogenase proteins, a novel candidate was identified which could be responsible for the observed activities. These results demonstrate operation of an acetogenic pathway, most probably as a yet unresolved variant of the Wood-Ljungdahl pathway, in anaerobic, galacturonate-limited cultures of “Ca. G. soehngenii.”BT/Industriele MicrobiologieBT/Environmental BiotechnologyBT/Biotechnologi
Foldable 3D Wafer Level SSL Package Using Flexible Interconnect
No full textSolid State Lighting (SSL) is on track to replace conventional incandescent and fluorescent sources for general lighting. Even though it offers many benefits, the high initial device costs are still a major hindrance for many consumers. Packaging can account for up to half of the total device price, offering high potential for cost reduction. In this thesis, novel silicon wafer level packaging (WLP) concept and development platform are presented. The proposed packaging platform consists of silicon chips connected with neutral bending plane based flexible interconnect. Each chip contains an etched reflector cavity with wire bonded LED. The polyimide encapsulated flexible interconnects offer the benefit of folding the package into a 3D geometric shape. The space around the reflector cavity could be used to integrate active components and the backside { for passive components of the SSL driver circuit. The design, fabrication and characterization of the package is presented. A novel method to interconnect the front and backside of the chips is also incorporated into the process flow. After fabrication, packages are completed by adding LEDs, applying phosphor color conversion and release from substrate, followed by characterization of electrical, mechanical, thermal and optical performance. The developed packaging platform offers potential for future functional expansion by means of heterogeneous integration, possibly leading to a smart WLP package for SSL.ECTM Electronic Components, Technology and MaterialsMicroelectronics & Computer EngineeringElectrical Engineering, Mathematics and Computer Scienc
Critical Choices: A Historical Consideration of Empowerment in Domestic Violence Advocacy Work
No full textWhy don’t women leave their abusive partners? This question is the primary component of popular rhetoric concerning domestic violence today. “Empowering” abused women has become a catchphrase in discussions of domestic violence advocacy work. Despite their difficult situations, many women practice forms of resistance. The author argues that painting these women as helpless victims misinterprets their situation. Methodology includes fieldwork as a volunteer telephone counselor with the Women’s Law Project (WLP), a Philadelphia-based feminist nonprofit organization, as well as a review of literature examining domestic violence, advocacy work, and empowerment. The author also conducted open-ended interviews with other telephone counselors, concentrating on their experiences with domestic violence advocacy work, and the philosophies of the Telephone Counseling Program at WLP
Impact of different trace elements on metabolic routes during heterotrophic growth of C. ljungdahlii investigated through online measurement of the carbon dioxide transfer rate
No full textSynthesis gas fermentation using acetogenic clostridia is a rapidly increasing research area. It offers the possibility to produce platform chemicals from sustainable C1 carbon sources. The Wood-Ljungdahl pathway (WLP), which allows acetogens to grow autotrophically, is also active during heterotrophic growth. It acts as an electron sink and allows for the utilization of a wide variety of soluble substrates and increases ATP yields during heterotrophic growth. While glycolysis leads to CO2 evolution, WLP activity results in CO2 fixation. Thus, a reduction of net CO2 emissions during growth with sugars is an indicator of WLP activity. To study the effect of trace elements and ventilation rates on the interaction between glycolysis and the WLP, the model acetogen Clostridium ljungdahlii was cultivated in YTF medium, a complex medium generally employed for heterotrophic growth, with fructose as growth substrate. The recently reported anaRAMOS device was used for online measurement of metabolic activity, in form of CO2 evolution. The addition of multiple trace elements (iron, cobalt, manganese, zinc, nickel, copper, selenium, and tungsten) was tested, to study the interaction between glycolysis and the Wood ljungdahl pathway. While the addition of iron(II) increased growth rates and ethanol production, added nickel(II) increased WLP activity and acetate formation, reducing net CO2 production by 28%. Also, higher CO2 availability through reduced volumetric gas flow resulted in 25% reduction of CO2 evolution. These online metabolic data demonstrate that the anaRAMOS is a valuable tool in the investigation of metabolic responses i.e. to determine nutrient requirements that results in reduced CO2 production. Thereby the media composition can be optimized depending on the specific goal.All data is available upon request from the corresponding author
Human resource development practitioners' perspectives on competencies: an application of american society for training and development (ASTD) workplace learning andpPerformance (WLP) competency model in Malaysia
No full text2012 Fall.Includes bibliographical references.The intent of this research was to identify Malaysian Human Resource Development (HRD) practitioners' perceptions of competencies needed by HRD practitioners in organizations. The research was based on the American Society for Training and Development (ASTD) models for Workplace Learning and Performance (WLP) (Rothwell, Sanders, & Soper, 1999). The purpose was to assess the perceptions of Malaysian HRD practitioners in organizations regarding the importance of competencies for human resource development in organizational contexts. This study employed quantitative, cross-sectional survey, and an existing ASTD competencies instrument. Organizations were chosen based on the Federation of Malaysian Manufacturer's (FMM) database. Data for this study were collected from 144 HRD practitioners from various organizations in Malaysia who successfully completed the web-based survey. Data were analyzed using descriptive statistics, Exploratory Factor Analysis, ANOVA, t-test, and Pearson correlation. The findings of the study indicated that the Malaysian HRD practitioners perceived certain competencies as currently important and others as important in the future for their organization. The results were supported by a number of statistical findings with medium to small effect sizes. By using exploratory factor analysis, this study revealed that the Malaysian HRD practitioners perceived only 25 of the 52 competency items to be important. The results from this study have implications for the ASTD competency model and provide evidence that the competencies needed by employees and in organizations are changing over time
Forcing the strong Lefschetz and the maximal rank properties
No full textAbstractThree basic properties which standard graded artinian k-algebras may or may not enjoy are the Weak and Strong Lefschetz Properties and the Maximal Rank Property (respectively WLP, SLP, and MRP).In this paper we will assume that the base field k has characteristic zero. It is known that SLP implies MRP, which in turn implies WLP, but that both implications are strict. However, it surprisingly turned out (see [T. Harima, J. Migliore, U. Nagel, J. Watanabe, The weak and strong Lefschetz properties for artinian K-algebras, J. Algebra 262 (2003) 99–126]) that the set of Hilbert functions admitting any algebras with WLP coincides with the corresponding set for SLP (and therefore with that for MRP). In [J. Migliore, F. Zanello, The Hilbert functions which force the weak Lefschetz property, J. Pure Appl. Algebra 210 (2) (2007) 465–471], J. Migliore and the first author, using Green’s theorem and a result of Wiebe, characterized the Hilbert functions forcing all algebras to enjoy WLP. The purpose of this note is to prove the corresponding characterizations for both SLP and MRP. Unsurprisingly (or surprisingly??), the two characterizations coincide, but they define a class of Hilbert functions strictly smaller than that determined for WLP in the above cited reference.Our methods include the Herzog–Popescu theorem on quotients of k-algebras modulo a general form, a result of Wiebe, and gins and stable ideals. At the end, we will also discuss the importance of assuming that the characteristic be zero, and we will exhibit a class of codimension 2 monomial complete intersections for which SLP (but not MRP) fails in positive characteristic
Distinguished Lecture: Dr. Naomi Oreskes, Science Historian and Author
No full textThe Global Change Center at Virginia Tech welcomed Dr. Naomi Oreskes, Harvard historian and author, for a Distinguished Lecture on September 2, 2015, at 4:00 p.m. at the Lyric Theatre in Blacksburg, VA. Dr. Oreskes is a professor of the history of science and affiliated professor of Earth and planetary sciences at Harvard University. Her research focuses on the earth and environmental sciences, with a particular interest in understanding scientific consensus and dissent. Dr. Oreskes has received international acclaim for her 2010 book, "Merchants of Doubt, How a Handful of Scientists Obscured the Truth on Issues from Tobacco to Global Warming," co-authored with Erik M. Conway. It was shortlisted for the Los Angeles Time Book Prize, received the 2011 Watson-Davis Prize from the History of Science Society, and was recently adapted into a documentary film. Dr. Oreskes' visit represents the second in a Public Distinguished Lecture Series sponsored by the Global Change Center at Virginia Tech. The lecture series is designed to bring some of the world's leading scholars to the Blacksburg community to discuss critical environmental and societal issues in an open forum.Virginia Tech. Global Change CenterVirginia Tech. Interfaces of Global Change Interdisciplinary Graduate Education ProgramVirginia Tech. WLP Endowed Lecture FundVirginia Tech. Office of Undergraduate ResearchVirginia Tech. Department of HistoryVirginia Tech. Graduate SchoolVirginia Tech. Fralin Life Science InstituteDr. Oreskes' lecture was given at 4:00pm, September 2, 2015 at the Lyric Theatre in Blacksburg, Virginia.Video editing by Elizabeth McVo
Parameter θ-Type Marcinkiewicz Integral on Nonhomogeneous Weighted Generalized Morrey Spaces
No full textLet X,d,μ be a nonhomogeneous metric measure space satisfying the upper doubling and geometrically doubling conditions in the sense of Hytönen. In this setting, the author proves that parameter θ-type Marcinkiewicz integral Mθρ is bounded on the weighted generalized Morrey space Lp,ϕ,τω for p∈1,∞. Furthermore, the boudedness of Mθρ on weak weighted generalized Morrey space WLp,ϕ,τω is also obtained
Of borders, bridges and sisterhood
No full textWhen Southern women united under the 'Women's Linking Project' (WLP), they found they had as many similarities as differences. Greatest of these was colonial influence. The author shows how development programmes are still imperialistic and continue to subjugate women. Furthermore, she sees poverty in all its forms as a direct result of neo-liberal economic policies imposed by the West. The WLP aims not only for freedom from patriarchal oppression, but for equality for children and men too. It must do more to work with grassroots women, Northern women, and Southern men - each of which carries its own set of challenges.
This article is hosted by our co-publisher Taylor & Francis. For the full table of contents for this and previous issues of this journal, please visit the Gender and Development website
