14,555 research outputs found
RCEP vs TPP: the pursuit of eastern dominance
ASEAN when defined as a single regional bloc, can be perceived as being one of the most prominent battle-fields between two new economic powerhouses; the US and China. When compared to efforts in the prior half-century, the USâs regional integration efforts were derided politically and economically since the 2007 Western financial crisis. This was predominantly due to a plethora of reasons alike to the fact that post the impasse, the ASEAN nationsâ credence of the US as a political and trading partner greatly eroded. As a late runner, China exemplifies her regional prowess via an influx of Chinese emigration in those targeted regions. This enables the ASEAN nations to centre their trade around the Chinese economy in lieu of that of the US. This is galvanised by the wealth of the ethnic minority that efficiently entwine the ASEAN nations with China as the nucleus. Through the Regional Comprehensive Economic Partnership and the Trans-Pacific Partnership Agreement, two subsequent agreements were penned; and these concepts are examined from the Chinese perspective, and the effects that are encompassed are further amplified throughout the course of this paper
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Understanding the relative importance of vertical and horizontal flow in ice-wedge polygons
Ice-wedge polygons are common Arctic landforms. The future of these landforms in a warming climate depends on the bidirectional feedback between the rate of ice-wedge degradation and changes in hydrological characteristics. This work aims to better understand the relative roles of vertical and horizontal water fluxes in the subsurface of polygonal landscapes, providing new insights and data to test and calibrate hydrological models. Field-scale investigations were conducted at an intensively instrumented location on the Barrow Environmental Observatory (BEO) near Utqiagvik, AK, USA. Using a conservative tracer, we examined controls of microtopography and the frost table on subsurface flow and transport within a low-centered and a high-centered polygon. Bromide tracer was applied at both polygons in July 2015 and transport was monitored through two thaw seasons. Sampler arrays placed in polygon centers, rims, and troughs were used to monitor tracer concentrations. In both polygons, the tracer first infiltrated vertically until encountering the frost table and was then transported horizontally. Horizontal flow occurred in more locations and at higher velocities in the low-centered polygon than in the high-centered polygon. Preferential flow, influenced by frost table topography, was significant between polygon centers and troughs. Estimates of horizontal hydraulic conductivity were within the range of previous estimates of vertical conductivity, highlighting the importance of horizontal flow in these systems. This work forms a basis for understanding complexity of flow in polygonal landscapes
Oligoclonal expansions of CD8(+) T cells in chronic HIV infection are antigen specific
Acute HIV infection is associated with a vigorous immune response characterized by the proliferation of selected T cell receptor V beta (BV)-expressing CD8(+) T cells. These 'expansions', which are commonly detected in the peripheral blood, can persist during chronic HIV infection and may result in the dominance of particular clones. Such clonal populations are most consistent with antigen-driven expansions of CD8(+) T cells. However, due to the difficulties in studying antigen-specific T cells in vivo, it has been hard to prove that oligoclonal BV expansions are actually HIV specific. The use of tetrameric major histocompatibility complex-peptide complexes has recently enabled direct visualization of antigen-specific T cells ex vivo but has not provided information on their clonal composition. We have now made use of these tetrameric complexes in conjunction with anti-BV chain-specific monoclonal antibodies and analysis of cytotoxic T lymphocyte lines/clones to show that chronically clonally expanded CD8(+) T cells are HIV specific in vivo
Constitutive Model for Time-Dependent Flows of Shear-Thickening Suspensions
We develop a tensorial constitutive model for dense, shear-thickening particle suspensions subjected to time-dependent flow. Our model combines a recently proposed evolution equation for the suspension microstructure in rate-independent materials with ideas developed previously to explain the steady flow of shear-thickening ones, whereby friction proliferates among compressive contacts at large particle stresses. We apply our model to shear reversal, and find good qualitative agreement with particle-level, discrete-element simulations whose results we also present
Constitutive Model for Time-Dependent Flows of Shear-Thickening Suspensions.
We develop a tensorial constitutive model for dense, shear-thickening particle suspensions subjected to time-dependent flow. Our model combines a recently proposed evolution equation for the suspension microstructure in rate-independent materials with ideas developed previously to explain the steady flow of shear-thickening ones, whereby friction proliferates among compressive contacts at large particle stresses. We apply our model to shear reversal, and find good qualitative agreement with particle-level, discrete-element simulations whose results we also present
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