The shape of a free-surface slump of viscoplastic material supported by an oblique barrier on an inclined plane is investigated theoretically and experimentally. The barrier is sufficiently tall that it is not surmounted by the viscoplastic fluid, and a focus of this study is the largest volume of rigid viscoplastic fluid that can be supported upstream of it. A lubrication model is integrated numerically to determine the transient flow as the maximal rigid shape is approached. Away from the region supported by the barrier, the viscoplastic layer attains a uniform thickness in which the gravitational stresses are in balance with the yield stress of the material. However, closer to the barrier, the layer thickens and the barrier bears the additional gravitational loading. An exact solution for the rigid shape of the viscoplastic material is constructed from the steady force balance and computed by integrating Charpit’s equations along characteristics that emanate from the barrier wall. The characteristics represent the late-time streamlines of the flow as it approaches the rigid shape. The exact solution depends on a single dimensionless group, which incorporates the slope inclination, the barrier width and the fluid’s yield stress. It is shown that the shape is insensitive to the transient flow from which it originates. The force exerted by the slump is calculated for different barrier shapes. The results of new laboratory experiments are reported; these show that although convergence to the final rigid state is slow, there is good agreement with the experimental measurements at long times.

Lightweight, adjustable, and affordable devices are needed to enable the next generation of effective, wearable adjuncts for rehabilitation. Used at home or in a rehabilitation setting, these devices have the potential to reduce compound pressures on hospitals and social care systems. Despite recent developments in soft wearable robots, many of these devices restrict the range of motion and lack quantitative assessment of moment transfer to the wearer. The decoupled design of our wearable device for upper-limb rehabilitation successfully delivers almost the full range of motion to the user, with a mean maximum flexion angle of 149° (SD = 8.5). In this article, for the first time, we show that in tests involving a wide range of participants, 82% of the moment produced by the actuator is applied to the wearer. This testing of elbow flexion moment transfer supports the effectiveness of the device. This research is a step toward effective pneumatic soft robotic wearable devices that are adaptable to a wide range of users – a necessary prerequisite for their widespread adoption in health care.

This article takes up a philosophical examination of the Latter-day Saint theological conception of the eternal significance of sex. I first argue that the straightforward way of interpreting the theological claims about the eternal significance of sex appear to be incoherent. The main worry has to do with certain commitments Latter-day Saints take up with respect to the nature of disembodied spirits. Disembodied spirits don’t have bodies. As such they lack the characteristic features of embodied things. And sex is as bodily a feature as any we confront in the course of our lives. I will argue that these conceptual obstacles can be overcome by attending to distinctive aspects of the Latter-day Saint conception of divine creation. Doing so offers an interesting alternative way of conceptualizing the essences of premortal (disembodied) spirits. In particular, it motivates explicating their essences in terms of what Plantinga calls world-indexed properties. With the explication in hand, I show that not only are charges of incoherence avoided, but the new perspective gives a unified account of a variety of apparently disparate aspects of Latter-day Saint theology.