Rectosigmoid screwdriver perforation presenting as a strangulated inguinal hernia.

We present a case of a young male patient with no previously known medical, surgical or psychiatric history, who was referred to our institution as an irreducible left inguinal hernia with signs of strangulation. Intraoperative findings, however, revealed a retained foreign body at the rectosigmoid junction, which had previously perforated through the floor of the inguinal canal, essentially sealing off the contamination into the inguinal canal and contributing to the clinical presentation of a left inguinal hernia. This is, to our knowledge, the first published case report locally and internationally concerning rectosigmoid-inguinal canal perforation with the working end of a screwdriver.

Temperature and interlayer coupling induced thermal transport across graphene/2D-SiC van der Waals heterostructure.

Graphene based two-dimensional (2D) van der Waals (vdW) materials have attracted enormous attention because of their extraordinary physical properties. In this study, we explore the temperature and interlayer coupling induced thermal transport across the graphene/2D-SiC vdW interface using non-equilibrium molecular dynamics and transient pump probe methods. We find that the in-plane thermal conductivity κ deviates slightly from the 1/T law at high temperatures.

Exceptional in-plane and interfacial thermal transport in graphene/2D-SiC van der Waals heterostructures.

Graphene based van der Waals heterostructures (vdWHs) have gained substantial interest recently due to their unique electrical and optical characteristics as well as unprecedented opportunities to explore new physics and revolutionary design of nanodevices. However, the heat conduction performance of these vdWHs holds a crucial role in deciding their functional efficiency. In-plane and out-of-plane thermal conduction phenomena in graphene/2D-SiC vdWHs were studied using reverse non-equilibrium molecular dynamics simulations and the transient pump-probe technique, respectively.

Quantitative perfusion-CMR is significantly influenced by the placement of the arterial input function.

The aim of this study is to provide a systematic assessment of the influence of the position on the arterial input function (AIF) for perfusion quantification. In 39 patients with a wide range of left ventricular function the AIF was determined using a diluted contrast bolus of a cardiac magnetic resonance imaging in three left ventricular levels (basal, mid, apex) as well as aortic sinus (AoS). Time to peak signal intensities, baseline corrected peak signal intensity and upslopes were determined and compared to those obtained in the AoS.