180,127 research outputs found
Culture, Constructivism, and Media: Designing a Module on Carlos Slim
No full textMexican tycoon Carlos Slim Helú has been a fixture on Forbes’s list of billionaires since 1991, and for the past three years, he has topped the magazine’s list of the world’s richest men. Although he is exceptionally well-known in his native Mexico, the majority of American college students have never heard of Carlos Slim. This article presents a curricular module built around this charismatic and controversial figure. The module requires students to navigate Internet-supported news media in the target language (Spanish), and engages them in independent, small-group, and larger, teacher-led activities designed to foster critical and comparative skills in cultural competency and analysis through process-based, student-led inquiry. Pedagogically and methodologically, the author engages with the recommendations and conclusions of recent studies by ACTFL and MLA committees, as well as by other leading scholars, regarding both the use of technology in the classroom and the idea of “teaching culture.” The unit’s content significantly deepens and enriches students’ understanding of social, economic, and political issues in modern Mexico. The article carefully situates each stage and aspect of the curricular unit presented in relation to recent studies of constructivism in foreign language acquisition and on the hierarchy of Bloom’s taxonomy of learning objectives
slim shady is a novel allele of PHYTOCHROME B present in the T-DNA line SALK_015201
No full textAuxin is a hormone that is required for hypocotyl elongation during seedling development. In response to auxin, rapid changes in transcript and protein abundance occur in hypocotyls, and some auxin responsive gene expression is linked to hypocotyl growth. To functionally validate proteomic studies, a reverse genetics screen was performed on mutants in auxin-regulated proteins to identify novel regulators of plant growth. This uncovered a long hypocotyl mutant, which we called slim shady, in an annotated insertion line in IMMUNOREGULATORY RNA-BINDING PROTEIN (IRR). Overexpression of the IRR gene failed to rescue the slim shady phenotype and characterization of a second T-DNA allele of IRR found that it had a wild-type (WT) hypocotyl length. The slim shady mutant has an elevated expression of numerous genes associated with the brassinosteroid-auxin-phytochrome (BAP) regulatory module compared to WT, including transcription factors that regulate brassinosteroid, auxin, and phytochrome pathways. Additionally, slim shady seedlings fail to exhibit a strong transcriptional response to auxin. Using whole genome sequence data and genetic complementation analysis with SALK_015201C, we determined that a novel single nucleotide polymorphism in PHYTOCHROME B was responsible for the slim shady phenotype. This is predicted to induce a frameshift and premature stop codon at leucine 1125, within the histidine kinase-related domain of the carboxy terminus of PHYB, which is required for phytochrome signaling and function. Genetic complementation analyses with phyb-9 confirmed that slim shady is a mutant allele of PHYB. This study advances our understanding of the molecular mechanisms in seedling development, by furthering our understanding of how light signaling is linked to auxin-dependent cell elongation. Furthermore, this study highlights the importance of confirming the genetic identity of research material before attributing phenotypes to known mutations sourced from T-DNA stocks.This article is published as Dash, Linkan, Robert E. McEwan, Christian Montes, Ludvin Mejia, Justin W. Walley, Brian P. Dilkes, and Dior R. Kelley. "slim shady is a novel allele of PHYTOCHROME B present in the T‐DNA line SALK_015201." Plant Direct 5, no. 6 (2021): e00326. doi:10.1002/pld3.326.Iowa State University (ISU); National Science Foundation (NSF), Grant/Award Number: 1444503
Slim groupoids
No full textsummary:Slim groupoids are groupoids satisfying . We find all simple slim groupoids and all minimal varieties of slim groupoids. Every slim groupoid can be embedded into a subdirectly irreducible slim groupoid. The variety of slim groupoids has the finite embeddability property, so that the word problem is solvable. We introduce the notion of a strongly nonfinitely based slim groupoid (such groupoids are inherently nonfinitely based) and find all strongly nonfinitely based slim groupoids with at most four elements; up to isomorphism, there are just two such groupoids
Varieties of idempotent slim groupoids
No full textsummary:Idempotent slim groupoids are groupoids satisfying and . We prove that the variety of idempotent slim groupoids has uncountably many subvarieties. We find a four-element, inherently nonfinitely based idempotent slim groupoid; the variety generated by this groupoid has only finitely many subvarieties. We investigate free objects in some varieties of idempotent slim groupoids determined by permutational equations
Brandbemessung von Slim-Floor-Trägern
No full textSlim‐floor beams are a well‐known and cost‐effective solution that permits a significant reduction of floor thickness, and are increasingly used in industrial and commercial buildings. Since only their lower flange is exposed to fire, slim‐floor beams may also achieve higher fire resistance, in comparison to other types of composite beams that are not fully embedded in the concrete floor. Simplified models are available in Eurocode 4 Parts 1‐2 to evaluate the temperature distribution for partially encased and non‐encased composite beams. However this standard does not provide any simplified model to evaluate the cross‐sectional temperature field of slim‐floor beams. In this sense, different proposals have been evaluated in recent years in order to provide simplified models for temperature evaluation. The currently available models in the literature have shown their accurate behaviour providing results on the safe side, and are recommended for use in practice. Finally, this work shows that slim‐floor composite beams can provide good performance during a fire event. Specifically, 60 min of standard fire rating can be achieved for load levels lower than 0.5–0.6. Improved behaviour to achieve 90 or 120 min of standard fire exposure may also be reached by using innovative solutions, advanced materials or external protection.Die Slim-Floor-Bauweise ist eine erprobte und wirtschaftliche Lösung. Sie ermöglicht unter anderem eine erhebliche Redu-zierung der Deckenstärke und wird zunehmend in Industrie- und Gewerbegebäuden eingesetzt. Darüber hinaus erzielen Slim-Floor-Träger, da sie größtenteils in die Decke integriert sind und somit nur die untere angeschweißte Platte direkt einem Brand ausgesetzt wird, einen wesentlich höheren Feuer-widerstand als etwa klassische Verbundträger. In Eurocode4 Teil1-2 finden sich zwar vereinfachte Methoden zur Bestim-mung der Bauteiltemperaturen von Verbundträgern mit und ohne Kammerbeton, jedoch gibt diese Norm keine vereinfachte Methode zur Bestimmung der Temperaturen eines Slim-Floor-Querschnitts an. In den letzten Jahren wurden vereinfachte Modelle zur Bestimmung der Temperaturverteilung von Slim-Floor-Querschnitten entwickelt. Diese derzeit verfügbaren Mo-delle liefern Ergebnisse auf der sicheren Seite und können für eine praktische Anwendung durchaus empfohlen werden. In diesem Artikel wird gezeigt, dass Slim-Floor-Träger während eines Brandereignisses eine exzellente Tragfähigkeit besitzen. Insbesondere können für Ausnutzungsgrade von 0,5 bis 0,6 die Anforderungen an die Feuerwiderstandsklasse R60 erfüllt wer-den. Die Feuerwiderstandsklassen R90 und R120 können durch Anwendung innovativer Lösungen, durch verbesserte Materia-lien oder auch passiven Brandschutz erfüllt werden
Fixed and reconfigurable multiband antennas
No full textThis thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel UniversityWith the current scenario of development of antennas in the wireless communication field, the need of compact multiband, multifunctional and cost effective antenna is on the rise. The objective of this thesis is to present fixed and reconfigurable techniques and methods for small and slim multiband antennas, which are applicable to serve modern small and slime wireless, mobile and cognitive radio applications. In the fixed designs, independent control of the operating frequencies is investigated to enhance the antennas capabilities and to give the designer an additional level of freedom to design the antenna for other bands easily without altering the shape or the size of the antenna. In addition, for mobile phone antenna, the effect of user’s hand and mobile phone housing are studied to be with minimum effect. Although fixed multiband antennas can widely be used in many different systems or devices, they lack flexibility to accommodate new services compared with reconfigurable antennas. A reconfigurable antenna can be considered as one of the key advances for future wireless communication transceivers. The advantage of using a reconfigurable antenna is to operate in multiband where the total antenna volume can be reused and therefore the overall size can be reduced. Moreover, the future of cell phones and other personal mobile devices require compact multiband antennas and smart antennas with reconfigurable features. Two different types of frequency reconfigurability are investigated in this thesis: switchable and tunable. In the switchable reconfigurability, PIN diodes have been used so the antenna’s operating frequencies can hop between different services whereas varactor diode with variable capacitance allow the antenna’s operating frequencies to be fine-tuned over the operating bands. With this in mind, firstly, a switchable compact and slim antenna with two patch elements is presented for cognitive radio applications where the antenna is capable of operating in wideband and narrow bands depending on the states of the switches. In addition to this, a switchable design is proposed to switch between single, dual and tri bands applications (using a single varactor diode to act as a switch at lower capacitance values) with some fine tuning capabilities for the first and third bands when the capacitance of the diode is further increased. Secondly, the earlier designed fixed antennas are modified to be reconfigurable with fine-tuning so that they can be used for more applications in both wireless and mobile applications with the ability to control the bands simultaneously or independently over a wide range. Both analytical and numerical methods are used to implement a realistic and functional design. Parametric analyses using simulation tools are performed to study critical parameters that may affect the designs. Finally, the simulated designs are fabricated, and measured results are presented that validate the design approaches
Men with Musical Instruments (Red and Slim), July 1936
No full textR. Harvey, Men with Musical Instruments (Red and Slim), 7/1/36
Numerical study on the flexural behaviour of slim-floor beams with hollow core slabs at elevated temperature
No full text[EN] Slim-floor beams are a novel typology of steel beams where the steel profile is fully embedded within the concrete floor depth. While the use of this system is increasing fast in the construction practice, the available investigations on its fire performance are still scarce. This paper focuses on analysing the fire behaviour of slim floor beams combined with hollow core slabs as flooring system. Two configurations are studied, namely Integrated Floor Beam (IFB) and Shallow Floor Beam (SFB). A finite element model is developed and validated by comparison with experimental results available in the literature as well as with thermal tests carried out by the authors. Subsequently, parametric studies are conducted with the aim of providing practical design recommendations. The influence of the composite beam configuration, concrete type, longitudinal reinforcement and steel plate thickness is studied. The conclusions drawn in this paper suggest that the SFB configuration may provide a significant enhancement in terms of fire resistance compared to IFB, provided that the appropriate combination of the parameters studied is used.The authors would like to express their sincere gratitude to the Spanish "Ministerio de Economia y Competitividad" for the help provided through the Project BIA2015-67192-R and to the European Union through the FEDER funds.Albero Gabarda, V.; Espinós Capilla, A.; Serra Mercé, E.; Romero, ML.; Hospitaler Pérez, A. (2019). Numerical study on the flexural behaviour of slim-floor beams with hollow core slabs at elevated temperature. Engineering Structures. 180:561-573. https://doi.org/10.1016/j.engstruct.2018.11.061S56157318
slim shady is a novel allele of PHYTOCHROME B present in the T‐DNA line SALK_015201
No full textAbstract Auxin is a hormone that is required for hypocotyl elongation during seedling development. In response to auxin, rapid changes in transcript and protein abundance occur in hypocotyls, and some auxin responsive gene expression is linked to hypocotyl growth. To functionally validate proteomic studies, a reverse genetics screen was performed on mutants in auxin‐regulated proteins to identify novel regulators of plant growth. This uncovered a long hypocotyl mutant, which we called slim shady, in an annotated insertion line in IMMUNOREGULATORY RNA‐BINDING PROTEIN (IRR). Overexpression of the IRR gene failed to rescue the slim shady phenotype and characterization of a second T‐DNA allele of IRR found that it had a wild‐type (WT) hypocotyl length. The slim shady mutant has an elevated expression of numerous genes associated with the brassinosteroid‐auxin‐phytochrome (BAP) regulatory module compared to WT, including transcription factors that regulate brassinosteroid, auxin, and phytochrome pathways. Additionally, slim shady seedlings fail to exhibit a strong transcriptional response to auxin. Using whole genome sequence data and genetic complementation analysis with SALK_015201C, we determined that a novel single nucleotide polymorphism in PHYTOCHROME B was responsible for the slim shady phenotype. This is predicted to induce a frameshift and premature stop codon at leucine 1125, within the histidine kinase‐related domain of the carboxy terminus of PHYB, which is required for phytochrome signaling and function. Genetic complementation analyses with phyb‐9 confirmed that slim shady is a mutant allele of PHYB. This study advances our understanding of the molecular mechanisms in seedling development, by furthering our understanding of how light signaling is linked to auxin‐dependent cell elongation. Furthermore, this study highlights the importance of confirming the genetic identity of research material before attributing phenotypes to known mutations sourced from T‐DNA stocks
Design and simulation of slim fiber laser vector hydrophone
No full textA slim fiber laser vector hydrophone with a sensitivity-enhanced flexed beam configuration was presented to satisfy the demands of the slim vector hydrophone array. The sensitivity and resonant frequency of this configuration was calculated by the elastic mechanics and vibration theory. Compared with some existing configurations, the key factor that influences the sensitivity and resonant frequency was found out and some discussion on enhancing the sensitivity without reducing the resonant frequency was carried out. A3D finite element method(FEM) simulation and analysis of the configuration were performed in ANSYS. The simulation result revises the factor in the theoretical analysis and gives a recalculated sensitivity of81.3 pm/g with a resonant frequency of250 Hz of the novel fiber laser vector hydrophone. The flexed beam configuration is shown to give the highest sensitivity under resonant frequency of250 Hz of the four designs considered in this paper
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