A Frustrated Antipolar Phase Analogous to Classical Spin Liquids.

The study of magnetic frustration in classical spin systems is motivated by the prediction and discovery of classical spin liquid states. These uncommon magnetic phases are characterized by a massive degeneracy of their ground state implying a finite magnetic entropy at zero temperature. While the classical spin liquid state is originally predicted in the Ising triangular lattice antiferromagnet in 1950, this state has never been experimentally observed in any triangular magnets.

Fingerprints of Critical Phenomena in a Quantum Paraelectric Ensemble of Nanoconfined Water Molecules.

We have studied the radio frequency dielectric response of a system consisting of separate polar water molecules periodically arranged in nanocages formed by the crystal lattice of the gemstone beryl. Below = 20-30 K, quantum effects start to dominate the properties of the electric dipolar system as manifested by a crossover between the Curie-Weiss and the Barrett regimes in the temperature-dependent real dielectric permittivity ε'(). When analyzing in detail the temperature evolution of the reciprocal permittivity (ε') down to ≈ 0.

Single-particle and collective excitations of polar water molecules confined in nano-pores within a cordierite crystal lattice.

Recently, the low-temperature phase of water molecules confined within nanocages formed by the crystalline lattice of water-containing cordierite crystals has been reported to comprise domains with ferroelectrically ordered dipoles within the , -planes which are antiferroelectrically alternating along the -axis. In the present work, comprehensive broad-band dielectric spectroscopy is combined with specific heat studies and molecular dynamics and Monte Carlo simulations in order to investigate in more detail the collective modes and single-particle excitations of nanoconfined water molecules. From DFT-MD simulations we reconstruct the potential-energy landscape experienced by the HO molecules.

LaPdIn: superconductivity and lattice properties at ambient and elevated pressures.

Lattice and electronic properties of LaPdIn were studied at ambient and elevated pressures so as to determine features related to a specific atomic coordination without any influence of magnetism. We describe temperature dependences of lattice parameters, heat capacity and electrical resistivity of single-crystalline LaPdIn (s.g.

Pressure induced superconductivity in a CeRhSisingle crystal-the high pressure study.

Pressure induced superconductivity in non-centrosymmetric CeRhSiand CeIrSicompounds has attracted significant attention of the scientific community since its discovery 15 years ago. Up-to-date, all reported experimental results were obtained employing the hybrid-cylinder piston pressure cells with a maximum reachable pressure of 3 GPa. Present study focuses on the superconducting state at higher, so far unreported, pressures using the Bridgman anvil cell and a CeRhSisingle crystal synthesized by the Sn-true-flux method.

CePtAl: Structural and Bulk Properties.

This work is focused on the structural and physical properties of CePtAl, an intermetallic compound. At room temperature, the modulated orthorhombic structure (00)000, with = (0.481, 0, 0) has been determined by single-crystal X-ray diffraction supplemented by dependence of lattice parameters above room temperature for which the X-ray powder diffraction was used.

Dielectric ordering of water molecules arranged in a dipolar lattice.

Intermolecular hydrogen bonds impede long-range (anti-)ferroelectric order of water. We confine HO molecules in nanosized cages formed by ions of a dielectric crystal. Arranging them in channels at a distance of ~5 Å with an interchannel separation of ~10 Å prevents the formation of hydrogen networks while electric dipole-dipole interactions remain effective.

Impact of isoelectronic substitution and hydrostatic pressure on the quantum critical properties of CeRhSi.

There is an ongoing dispute in the community about the absence of a magnetic quantum critical point (QCP) in the noncentrosymmetric heavy fermion compound CeRhSi. In order to explore this question we prepared single crystals of CeRh(SiGe)with= 0.05 and 0.

Prospective pilot-study of combined bipolar radiofrequency ablation and application of bone cement in bone metastases.

Background: The purpose of this study was to determine the efficacy and safety of radiofrequency ablation (RFA) of bone metastases of breast cancer and to compare RFA alone and RFA with additional bone cement application. The primary objectives were to compare pain reduction and quality of life during long-term follow-up in a prospective pilot study.

Patients And Methods: Sixteen female patients with painful spinal bone metastases of human breast cancer were included in this prospective pilot study (mean age 59.

Autoimmune pancreatitis in an 11-year-old boy.

We report a case of histopathologically proven autoimmune pancreatitis in an 11-year-old boy. Abdominal US and MRI showed a focal swelling of the pancreatic head, the latter also showing delayed contrast enhancement. There was diffuse irregular pancreatic duct narrowing, compression of the intrapancreatic common bile duct, and mild proximal biliary dilatation on MR cholangiopancreatography.

How reliable are the risk estimates for X-ray examinations in forensic age estimations? A safety update.

Possible biological side effects of exposure to X-rays are stochastic effects such as carcinogenesis and genetic alterations. In recent years, a number of new studies have been published about the special cancer risk that children may suffer from diagnostic X-rays. Children and adolescents who constitute many of the probands in forensic age-estimation proceedings are considerably more sensitive to the carcinogenic risks of ionizing radiation than adults.

Radiofrequency ablation of experimental bone metastases in nude rats.

Purpose: Animal models are indispensable to investigate bone metastasis and to test different preclinical therapy options. Radiofrequency ablation is an upcoming technique for palliating pain from bone metastases. The aim of this study was to generate osteolytic lesions and to enable a technique to achieve access to the bone to successfully carry out radiofrequency ablation.

False aneurysm of the left femoral artery and thrombosis of the left femoral vein after total hip arthroplasty.

We report a 75-year-old male patient with an aneurysm of the left femoral artery after cemented total hip arthroplasty. Two months after the operation, the patient showed a spherical resistance and pain in the left groin. Examination showed a big false aneurysm of the left femoral artery.

New prostheses for venous substitution.

In 81 Beagle dogs, 6 cm long segments of the inferior vena cava were replaced end-to-end by artificial vascular grafts (10 mm in diameter) without an av-fistula and anticoagulant drugs. Different graft materials have been used, such as various e-PTFE (30-90 microns fiber length) and polyurethane with low and increased microporosity. e-PTFE with 75 microns fiber length and polyurethane with increased porosity showed the best tissue incorporation, complete endothelialization of the whole length and a high patency rate of 80-85% after a follow-up of 12 months.

[Endooesophageal prostheses and their complications (author's transl)].

After inserting an oesophageal prosthesis complications could be demonstrated in 53 cases (65%) from a total of 81 autopsies. Age distribution, tumour localisation and its relation to the development of local complications are analysed. Notwithstanding the high incidence of complications endoprostheses should be given preference to gastric fistulae.