New way to characterize the percolation threshold of polyethylene and carbon nanotube polymer composites using Fourier transform (FT) rheology

Ahirwal, Deepak,Palza, Humberto,Schlatter, Guy,Wilhelm, Manfred 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.3

In this article, a new way to characterize the percolation threshold of polymer nanocomposites made of polyethylene (PE) with single and multi walled carbon nanotubes (SWCNTs and MWCNTs) is presented. Small and large oscillatory shear (SAOS and LAOS) experiments were performed to characterize the degree of dispersion and percolation threshold. The analysis of the stress response in the LAOS regime as a function of the applied deformation amplitude and frequency was performed using Fourier Transform (FT)-Rheology. The zero strain intrinsic nonlinear parameter, $Q_0({\omega})$, was calculated by extrapolation of $I_{3/1}({\gamma}_0,{\omega})$ and was, used to quantify the nonlinearity measured by FT-Rheology. Interestingly, a drop in $Q_0$ as a function of the CNT weight fraction at a fixed frequency was found that was below the percolation threshold. This was followed by, a steep rise in $Q_0$ above the percolation threshold. Therefore, the new method based on this observation that is proposed and described with this article has the potential to lead to a better understanding of structure-property relationships in polymer nanocomposites.

THE CODES OF LUXURY BRAND COMMUNICATION IN PRINT ADVER TISING

Hannes Gurzki,Nadia Schlatter,David Woisetschl?ger 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7

Most researchers agree that core to the value proposition of luxury brands is their sym-bolic content and the image they convey (e.g., Dubois and Paternault 1995, Albrecht et al. 2013). One of the key mechanisms through which the brand is charged with symbolic content is advertising (McCracken 1986). Advertising is a key medium in the meaning creation process which is strongly controlled by brand management and intentionally used to convey a certain image to consumers (Kim, Lloyd, and Cervellon 2015). Given the importance of advertising to the luxury industry, it is surprising that only little re-search exists that explores how luxury brands build and communicate their brand in ad-vertising (Freire 2014, Mortelmans 1998, Mortelmans 2014). This study closes this gap by identifying the key themes and codes which luxury brands use in their advertising, analyses their usage and evolution over time, category and brand to show similarities and differences between the advertising of luxury brands. This pro-vides the basis to answer the following research questions: • What are the main thematic and stylistic codes that luxury brands use in print adver-tising? • How do the thematic and stylistic codes vary between brands? • How do the thematic and stylistic codes vary between categories? • How do the thematic and stylistic codes vary over time? This research thus contributes to the advancement of luxury advertising theory as it pro-vides a comprehensive framework for academics and practitioners alike, to analyse and design luxury print advertisements. Drawing on research in the areas of luxury advertis-ing and semiotics, we develop a conceptual framework allowing to analyse and catego-rise print campaigns of luxury brands along the three dimensions’ brand, category and time for over 500 advertisements of luxury fashion brands. The study has important im-plications for academic research as well as the luxury industry. This study identifies the identity-relevant and symbolic codes used in creating a luxury brand and thus adds to an enhanced understanding of how luxury is communicated and constructed.

New way to characterize the percolation threshold of polyethylene and carbon nanotube polymer composites using Fourier transform (FT) rheology

Deepak Ahirwal,Humberto Palza,Guy Schlatter,Manfred Wilhelm 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.3

In this article, a new way to characterize the percolation threshold of polymer nanocomposites made ofpolyethylene (PE) with single and multi walled carbon nanotubes (SWCNTs and MWCNTs) is presented. Small and large oscillatory shear (SAOS and LAOS) experiments were performed to characterize the degreeof dispersion and percolation threshold. The analysis of the stress response in the LAOS regime as a functionof the applied deformation amplitude and frequency was performed using Fourier Transform (FT)-Rheology. The zero strain intrinsic nonlinear parameter, Q0(ω), was calculated by extrapolation of I3/1(γ0, ω) andwas, used to quantify the nonlinearity measured by FT-Rheology. Interestingly, a drop in Q0 as a functionof the CNT weight fraction at a fixed frequency was found that was below the percolation threshold. Thiswas followed by, a steep rise in Q0 above the percolation threshold. Therefore, the new method based onthis observation that is proposed and described with this article has the potential to lead to a better understandingof structure-property relationships in polymer nanocomposites.

Methicillin-resistant Staphylococcus aureus alters cell wall glycosylation to evade immunity

Gerlach, David,Guo, Yinglan,De Castro, Cristina,Kim, Sun-Hwa,Schlatterer, Katja,Xu, Fei-Fei,Pereira, Claney,Seeberger, Peter H.,Ali, Sara,Codé,e, Jeroen,Sirisarn, Wanchat,Schulte, Berit,Wolz, Ch Springer Science and Business Media LLC 2018 Nature Vol.563 No.7733

Seminário de música brasileira na aula de português língua adicional: análise interacional da construção conjunta da aprendizagem

GabrieladaSilvaBulla ( Gabriela Da Silva Bulla ),LetíciaSoaresBortolini ( Letícia Soares Bortolini ),GrazielaHoerbeAndrighetti ( Graziela H. Andrighetti ),MargareteSchlatter ( Margarete Schlatter ) 한국포르투갈-브라질학회 2011 포르투갈-브라질 연구 Vol.8 No.2

In this paper, we investigate how institutional identity relations and the selection of learning objects can be interactionally conceived in an additional language classroom oriented to language use as social action (Clark, 1996). Informed by Ethnomethodological Conversation Analysis and Interactional Sociolinguistics, we analyse an eight-minute sequence of interaction featuring participants engaged in the accomplishment of a Portuguese-as-an-additional-language classroom activity, namely a seminar on Brazilian music, in which each student was supposed to lecture on a different musical style. In order to co-construct learning, participants orient to various identities and understandings that are built and negotiated in the course of interaction, configuring different participant frameworks. The analyses show (1) the rearrangement of the lecturer’s speech through the construction of new concepts in interaction (emergent products), and (2) the participants’ efforts to sustain the seminar frame, through the negotiation of conflicting identities of lecturer/audience, teacher/student and Brazilian national/foreigner to Brazil. This paper evidences that, more than requiring the use of the additional language, pedagogical activities such as the one analysed are opportunities for the participants to negotiate identities and modes of participation, define relevant learning objects in the course of interaction, and locally deal with the unexpected.

Biomechanical Comparison of Fixed- versus Variable-Angle Locking Screws for Distal Humerus Comminuted Fractures

Ali Nourbakhsh,Adam G. Hirschfeld,Sravan Dhulipala,William Hutton,Timothy Ganey,Luis Lozada,Daniel Schlatterer,Gary Mark Lourie 대한정형외과학회 2019 Clinics in Orthopedic Surgery Vol.11 No.3

Background: To compare the stability of fixed- versus variable-angle locking constructs for the comminuted distal humerus fracture (AO/OTA 13-A3). Methods: Eight pairs of complete humeri harvested from eight fresh frozen cadavers were used for the study. We fixed the intact humeri using 2.7-mm/3.5-mm locking VA-LCP stainless steel distal humerus posterolateral (nine-hole) and medial (seven-hole) plates. An oscillating saw was used to cut a 1-cm gap above the olecranon fossa. The specimens were loaded in axial mode with the rate of 1 mm per 10 seconds to failure, and stress-strain curves were compared in each pair. The mode of failure was recorded as well as the load needed for 2- and 4-mm displacement at the lateral end of the gap. Results: The stiffness of the constructs, based on the slope of the stress-strain curve, did not show any difference between the fixed- versus variable-angle constructs. Likewise, there was no difference between the force needed for 2- or 4-mm displacement at the lateral gap between the fixed- and variable-angle constructs. The mode of failure was bending of both plates in all specimens and screw pull-out in four specimen pairs in addition to the plate bending. Conclusions: Our results did not show any difference in the biomechanical stability of the fixed- versus variable-angle constructs. There was not any screw breakage or failure of the plate-screw interface.