59 research outputs found
Thermal Properties of Isotopically Engineered Graphene
In addition to its exotic electronic properties graphene exhibits unusually
high intrinsic thermal conductivity. The physics of phonons - the main heat
carriers in graphene - was shown to be substantially different in
two-dimensional (2D) crystals, such as graphene, than in three-dimensional (3D)
graphite. Here, we report our experimental study of the isotope effects on the
thermal properties of graphene. Isotopically modified graphene containing
various percentages of 13C were synthesized by chemical vapor deposition (CVD).
The regions of different isotopic composition were parts of the same graphene
sheet to ensure uniformity in material parameters. The thermal conductivity, K,
of isotopically pure 12C (0.01% 13C) graphene determined by the optothermal
Raman technique, was higher than 4000 W/mK at the measured temperature Tm~320
K, and more than a factor of two higher than the value of K in a graphene
sheets composed of a 50%-50% mixture of 12C and 13C. The experimental data
agree well with our molecular dynamics (MD) simulations, corrected for the
long-wavelength phonon contributions via the Klemens model. The experimental
results are expected to stimulate further studies aimed at better understanding
of thermal phenomena in 2D crystals.Comment: 14 pages, 3 figure
A new research agenda for managing socio-cultural integration
Post-acquisition socio-cultural integration has received increasing attention from both scholars and practitioners since the early 1990s. During the past decade, research has increasingly focused on emotions and identity in mergers and acquisitions. This chapter introduces the reader to the vibrant research field and its relevance. This section sets the scene for the book, which provides a deeper understanding of how emotionsâboth positive and negativeâas well as values and identity enable a deeper socio-cultural integration after a merger or acquisition, and how leadership plays a crucial role in making it all happen. This chapter also highlights how the Nordic approach to post-acquisition socio-cultural integration refers to a large community of Nordic academics focusing on the softer social and human side of acquisition, often relying on a huge variety of qualitative methods, and to Nordic companies that are not afraid of adopting a more collaborative approach to post-acquisition integration
Defining high endothelial venules and tertiary lymphoid structures in cancer
High endothelial venules (HEVs) are structurally distinct blood vessels that develop during embryonic and neonatal life in all secondary lymphoid organs except the spleen. HEVs are critical for initiating and maintaining immune responses because they extract naĂŻve and memory lymphocytes from the bloodstream, regardless of antigen receptor specificity, and deliver them to antigen-presenting cells inside lymph nodes under homeostatic conditions. HEVs also develop postnatally in nonlymphoid organs during chronic inflammation driven by autoimmunity, infection, allografts, and cancer. Extranodal HEVs are usually surrounded by dense lymphocytic infiltrates organized into lymph-node like, T- and B-cell-rich areas called tertiary lymphoid structures (TLS). HEV neogenesis is thought to facilitate the generation of tissue-destroying lymphocytes inside chronically inflamed tissues and cancers.
We are studying the mechanisms underpinning HEV neogenesis in solid cancers and the role of homeostatic T-cell trafficking in controlling cancer immunity. In this chapter we describe methods for identifying HEV in tissue sections of cancerous tissues in humans and mice using immunohistochemical staining for the HEV-specific marker peripheral lymph node addressin (PNAd). L-selectin binding to PNAd is a necessary first step in homeostatic lymphocyte trafficking which is the defining function of HEV. We also describe methods to measure L-selectin-dependent homing of lymphocytes from the bloodstream into lymphoid tissues and tumors in preclinical cancer model
Hardness, elastic modulus, and structure of very hard carbon films produced by cathodic-arc deposition with substrate pulse biasing
Hardness, elastic modulus, and structure of very hard carbon films produced by cathodic-arc deposition with substrate pulse biasing
A Review of Recent Forest and Wildland Fire Management Decision Support Systems Research
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