Offering alternatives as a way of issuing directives to children: Putting the worse option last

In a corpus of c. 250 h of recorded interactions between young children and adults in USA and UK households, we found that children could be directed to change their course of action by three syntactic formats that offered alternatives: an imperative, or a modal declarative, plus a consequential alternative to non-compliance (e.g. come down at once or I shall send you straight to bed; you’ve got to stand here with it or it goes back in the cupboard), or an interrogative requiring a preference (e.g. do you want to put them neatly in the corner for mummy please or do you wanna go to bed). Formatted syntactically as or-alternatives, these can perform the actions both of warning and threatening. But they make a ‘bad’ course of action contiguous to the child's turn. We argue that adults choose this format because the interactional preference for contiguity makes the negative alternative the more salient one. This implies that adults attribute to children the ability to appreciate the flouting of preference organisation for deontic effect

Numerical study of turbulence models in the computation of blood flow in cannulas

In recent years, CFD has become an increasingly used tool in the design of blood-based devices. However, the estimation of red blood cells damage (hemolysis) remains a very important challenge due to the complex rheology of blood and the turbulence present in most pumping devices. The objective of this study was to identify an appropriate turbulence model suitable for predicting hemolysis in Hemodialysis cannula. Several modern turbulence models were evaluated in comparison to Direct Numerical Simulation (DNS), which was used as the gold standard. The fluid dynamics in the cannula was modeled as a coaxial jet in which Reynolds’ number approached 2800. Based on comparison of velocity and stress time-averaged profiles, the Shear Stress Transport (SST) model with Gamma-Theta transition was identified as an optimal compromise between accuracy and computational cost

Analytical considerations in the code qualification of piping systems

The paper addresses several analytical topics in the design and qualification of piping systems which have a direct bearing on the prediction of stresses in the pipe and hence on the application of the equations of NB, NC and ND-3600 of the ASME Boiler and Pressure Vessel Code. For each of the analytical topics, the paper summarizes the current code requirements, if any, and the industry practice

Police call-takers' first substantive question projects the outcome of the call

Police call-takers need to gather as much data as is needed, as quickly as possible, to determine whether and what action should be taken. On analysing 514 calls to a UK centre handling emergency (999) and non-emergency (101) calls, we find that the call-taker’s first substantive question already carries a diagnosis of the merits of the caller's case, and an implication of the call's likely outcome. Such questions come principally in four formats. On a gradient of increasing scepticism, these are: requests for the caller's location (which are treated as indicating that police action will be taken); open-ended requests for further information (treated as neutral); queries of the relevance of the incident or legitimacy of the caller, and reformulations of the caller's reason for calling (both projecting upcoming refusal of police action). We discuss the implications of this gradient for understanding how the calltakers manage their institutional goals. Data are in British English

Continuous flow vortex fluidic-mediated exfoliation and fragmentation of two-dimensional MXene

MXene (Ti2CTx) is exfoliated in a vortex fluidic device (VFD), as a thin film microfluidic platform, under continuous flow conditions, down to ca 3 nm thin multi-layered twodimensional (2D) material, as determined using AFM. The optimized process, under an inert atmosphere of nitrogen to avoid oxidation of the material, was established by systematically exploring the operating parameters of the VFD, along with the concentration of the dispersed starting material and the choice of solvent, which was a 1 : 1 mixture of isopropyl alcohol and water. There is also some fragmentation of the 2D material into nanoparticles ca 68 nm in diameter

Vortex fluidic mediated synthesis of TiO2 nanoparticle/MXene composites

Oxidation of MXene in a vortex fluidic device (VFD) operating under continuous flow results in exfoliation and fragmentation into nanoparticles of surface oxidised 2D material with further oxidation of the nanoparticles into anatase (TiO 2 ). These MXene and anatase nanoparticles co‐assemble into stable micron sized spheres which are topologically smooth, decorating the surface of exfoliated MXene. The formation of this composite material in the dynamic thin film in the VFD was optimised by systematically exploring the operating parameters of the microfluidic platform, determined at 45 o tilt angle for the 20 mm diamater glass tube spinning at 5k rpm, with a flow rate of a colloidal dispersion of MXene in aqueous H 2 O 2 (30%) at 0.75 mL/min, concentration of MXene 0.5 mg/mL