Controlling the phase transition in nanocrystalline ferroelectric thin films via cation ratio.

Traditionally, the ferroelectric Curie temperature can be manipulated by chemical substitution, e.g., in Ba1-xSrxTiO3 as one of the archetypical representatives.

Resonant domain-wall-enhanced tunable microwave ferroelectrics.

Ordering of ferroelectric polarization and its trajectory in response to an electric field are essential for the operation of non-volatile memories, transducers and electro-optic devices. However, for voltage control of capacitance and frequency agility in telecommunication devices, domain walls have long been thought to be a hindrance because they lead to high dielectric loss and hysteresis in the device response to an applied electric field. To avoid these effects, tunable dielectrics are often operated under piezoelectric resonance conditions, relying on operation well above the ferroelectric Curie temperature, where tunability is compromised.

High capacity lithium ion batteries composed of cobalt oxide nanoparticle anodes and Raman spectroscopic analysis of nanoparticle strain dynamics in batteries.

Cobalt nanoparticle thin films were electrophoretically deposited on copper current collectors and were annealed into thin films of hollow CoO nanoparticles. These thin films were directly used as the anodes of lithium ion batteries (LIBs) without the addition of conducting carbons and bonding agents. LIBs thus fabricated show high gravimetric capacities and long cycle lives.

Quantitative Phase-Change Thermodynamics and Metastability of Perovskite-Phase Cesium Lead Iodide.

The perovskite phase of cesium lead iodide (α-CsPbI or "black" phase) possesses favorable optoelectronic properties for photovoltaic applications. However, the stable phase at room temperature is a nonfunctional "yellow" phase (δ-CsPbI). Black-phase polycrystalline thin films are synthesized above 330 °C and rapidly quenched to room temperature, retaining their phase in a metastable state.

Surface Chemically Switchable Ultraviolet Luminescence from Interfacial Two-Dimensional Electron Gas.

We report intense, narrow line-width, surface chemisorption-activated and reversible ultraviolet (UV) photoluminescence from radiative recombination of the two-dimensional electron gas (2DEG) with photoexcited holes at LaAlO3/SrTiO3. The switchable luminescence arises from an electron transfer-driven modification of the electronic structure via H-chemisorption onto the AlO2-terminated surface of LaAlO3, at least 2 nm away from the interface. The control of the onset of emission and its intensity are functionalities that go beyond the luminescence of compound semiconductor quantum wells.

Subsurface imaging of coupled carrier transport in GaAs/AlGaAs core-shell nanowires.

We demonstrate spatial probing of carrier transport within GaAs/AlGaAs core-shell nanowires with nanometer lateral resolution and subsurface sensitivity by energy-variable electron beam induced current imaging. Carrier drift that evolves with applied electric field is distinguished from a coupled drift-diffusion length. Along with simulation of injected electron trajectories, combining beam energy tuning with precise positioning for selective probing of core and shell reveals axial position- and bias-dependent differences in carrier type and transport along parallel conduction channels.

Patient adviser what to do for nasal injuries.

Getting hit in the nose can be scary, especially if it starts bleeding a lot. Your nose is at risk in a collision with another player or piece of sporting equipment, and striking the bones in your face can be very painful. That's why wearing protective gear, like a helmet and a mouth guard, is so important when playing sports.

Facial Injuries in Sports: A Team Physician's Guide to Diagnosis and Treatment.

Team physicians must be prepared to manage facial injuries, including contusions, abrasions, lacerations, nasal fractures, septal hematomas, auricular hematomas, ruptured tympanic membranes, and fractures of the facial bones. With a focused history and a thorough physical exam, the diagnosis can be clearly established. Early treatment of sports-related facial injuries helps avoid complications, and athletes may expect to return to play after predictable time intervals.

Overtraining Syndrome: Why Training too Hard, too Long, Doesn't Work.

You've been feeling exhausted, achy, edgy, and burned out. Worse yet, your personal relationships are suffering and you're stressed over so many demands on your time. On top of that, your athletic performance has "hit the wall," and you just can't seem to do any better.

Overtraining syndrome: a guide to diagnosis, treatment, and prevention.

Overtraining syndrome is a common cause of underperformance in athletes. Symptoms such as persistent fatigue, muscle soreness, reduced coordination, weight loss, mood changes, and frequent illness may accompany performance decrements, but they may also be signs of underlying medical conditions. Reliable and practical diagnostic laboratory tests for overtraining have not yet been identified.