Magnetic Structure and Origin of Insulating Behavior in the BaCuOsO System, and the Role of A-Site Ionic Size in Its Bandgap Opening: Density Functional Theory Approaches.

The magnetic structure and the origin of band gap opening for BaCuOsO were investigated by exploring the spin exchange interactions and employing the spin-orbit coupling effect. It revealed that the double-perovskite BaCuOsO, composed of the 3d (Cu) and 5d (Os) transition metal magnetic ions is magnetic insulator. The magnetic susceptibilities of BaCuOsO obey the Curie-Weiss law, with an estimated Weiss temperature of -13.

Investigation for Thermoelectric Properties of the MoS Monolayer-Graphene Heterostructure: Density Functional Theory Calculations and Electrical Transport Measurements.

We investigated the thermoelectric (TE) properties of the MoS monolayer-graphene heterostructure which consists of the MoS monolayer and graphene. The electronic structures of the MoS monolayer-graphene heterostructure are mainly contributed from graphene and the MoS monolayer for the valence band maximum and conduction band minimum, respectively. The change in the electronic structures near the Fermi level is responsible for the fact that the calculated Seebeck coefficients and electrical conductivity σ/τ of MoS monolayer-graphene are largely affected from those of graphene and the MoS monolayer.

Ternary selenides ASbSe (A = K, Rb and Cs) as an n-type thermoelectric material with high power factor and low lattice thermal conductivity: importance of the conformationally flexible Sb-Se-Se-Sb bridges.

We investigated the thermoelectric properties of the layered ternary selenides ASbSe (A = K, Rb and Cs) and the lattice thermal conductivity of KSbSe on the basis of DFT calculations, to find that these selenides are a high-performance n-type thermoelectric material. The Seebeck coefficients and power factors calculated for the electron carriers of ASbSe (A = K, Rb and Cs) are greater than those of the well-known thermoelectric materials BiTe and PbTe. The lattice thermal conductivity of KSbSe is comparable to that of PbTe, well-known for its low lattice thermal conductivity.

Gigantic Phonon-Scattering Cross Section To Enhance Thermoelectric Performance in Bulk Crystals.

In thermoelectric energy conversions, thermal conductivity reduction is essential for enhancing thermoelectric performance while maintaining a high power factor. Herein, we propose an approach based on coated-grain structures to effectively reduce the thermal conductivity to a much greater degree when compared to that done by conventional nanodot nanocomposite. By incorporating CdTe coated layers on the surface of SnTe grains, the thermal conductivity is as low as 1.

Cause for the Orbital Ordering of CsAgF and Its Effect on Thermoelectric Properties.

The cause for the orbital-ordered structure of orthorhombic CsAgF and its effect on thermoelectric properties were probed by density functional theory calculations. The orbital-ordered structure of orthorhombic CsAgF has been regarded as caused by a cooperative Jahn-Teller (JT) distortion of the AgF octahedra of tetragonal CsAgF. However, each AgF octahedron of tetragonal CsAgF is axially compressed and hence has no JT instability.

Outcome of balloon kyphoplasty for the treatment of osteoporotic vertebral compression fracture in patients with rheumatoid arthritis.

Background: Osteoporosis and osteoporotic fractures are widely known as complications of rheumatoid arthritis. Kyphoplasty (KP) is known as an effective treatment modality for reducing pain and correcting kyphotic deformity in osteoporotic vertebral compression fracture (OVCF). However, cutcomes of KP in rheumatoid patients are not well known.

Comparative Effects of Dexmedetomidine and Propofol on US-Guided Radiofrequency Ablation of Hepatic Neoplasm Under Monitored Anesthesia Care: A Randomized Controlled Study.

Percutaneous radiofrequency ablation (RFA) is a useful and safe procedure for treating hepatic neoplasm. However, liver RFA causes severe pain, which thereby increases the demand for monitored anesthesia care (MAC). Here, we compared the efficacy and safety of propofol and dexmedetomidine, which are commonly administered during MAC when performing RFA to assess hepatic neoplasm.

Comparison of the rate of successful endotracheal intubation between the "sniffing" and "ramped" positions in patients with an expected difficult intubation: a prospective randomized study.

Background: Optimal head and neck positioning and clinical experience are important factors for successful endotracheal intubation in patients with a difficult airway. This study aimed to investigate the rate of successful endotracheal intubation between the sniffing and ramped positions in patients with an expected difficult intubation.

Methods: The study included 204 patients with an expected difficult intubation (airway difficulty score ≥ 8) based on the preoperative airway assessment.

Usefulness of the korean knee score for evaluation of the results of total knee arthroplasty.

Purpose: The Korean Knee score (KKS) was designed to reflect the floor-sitting lifestyle that necessitates high knee flexion. The purpose of this study is to assess whether the KKS reflects the floor-sitting lifestyle more accurately than the previously developed Knee Society clinical rating system. In addition, the presence of ceiling effects was compared between the two rating systems.