Magnetic tuning with minimal thermal drift in high-Q microspheres coated with magnetorheological polydimethylsiloxane.

Integration of whispering-gallery-mode (WGM) resonators with high-quality factors (Q) into advanced timing, oscillator, and sensing systems demands a platform that enables precise resonance frequency modulation. This study investigates the tuning characteristics of magnetorheological polydimethylsiloxane (MR-PDMS) coated microspheres (µ-spheres) employed as magnetic microresonators, achieving a Q value of 10 at the 1550 nm wavelength. Magnetic WGM resonators not only endow the device with magnetic adjustability but also markedly improve thermal resistance.

Characteristics and outcome of impacted button batteries among young children less than 7 years of age in China: a retrospective analysis of 116 cases.

Background: Ingestion of button batteries occurs in about ten persons per one million persons each year, with most of them children, and one in every 1000 battery ingestions leads to serious injuries. This study aimed to describe the clinical features and outcome of ingestion or inhalation of button batteries in children spanning a decade from January, 2006 to December, 2016 at a tertiary care hospital.

Methods: We reviewed the clinical records of children who sought treatment for inhaled or ingested button batteries at our hospital during the study period.

[Clinical analysis of foreign body ingestion of button cell in children].

Objective: To improve diagnosis and treatment level of foreign body ingestion of button cell in children.

Method: Among the 14 cases with foreign bodies ingestion of button cell, 6 cases in esophageal, 7 cases in stomach and lower gastrointestinal tract, 1 case with multiple foreign bodies both in esophagus and stomach. Seven cases in stomach and lower gastrointestinal tract were closely observed without special treatment, 6 cases in esophageal, underwent esophagoscopy and removal of foreign body under general anesthesia, 1 case with multiple foreign bodies in esophagus and stomach underwent esophagoscopy and electronic gastroscopy and then removal of foreign body.

[The clinical analysis of tympanoplasty in treating children's chronic otitis media].

Objective: To study the effectiveness of tympanoplasty for treatment of chronic otitis media and cholesteatoma in children.

Method: Twenty-three cases with chronic otitis media and cholesteatoma treated by tympanoplasty were retrospectively studied, among which 15 cases had complete clinical data. The condition of surgical cavities, the duration of getting dry ears, the hearing improvements, the growth of new ear drums and whether the recurrence of cholesteatomas occurred or not were observed.

[Experience in the removal of difficult and high risk tracheobronchial foreign body by bronchoscopy].

Objective: To explore the best methods and skill for the removal of difficult and high risk tracheobronchial foreign body under bronchoscope.

Methods: A retrospective review was performed between August 1995 to August 2012. There were 4217 children with tracheobronchial foreign body, among them, 272 were diagnosed as high-risk, highly difficult tracheobronchial foreign bodies confirmed by clinical manifestations, foreign body type and bronchoscopy.

[CT and MRI study in severe sensorineural hearing loss in children].

Objective: To investigate the value of CT and MRI in diagnosing the children with sensorineural hearing loss.

Method: Ninety-six cases suspected as severe sensorineural hearing loss were examined by CT/MRI system and 3D reconstruction.

Result: Of 96 cases, 15 cases were found malformation these malformation included Michel, cochlear hypoplasia, commun cavity, Mondini, inner canal straitness, cochlear nerve undeveloped and vestibular aqueduct enlargements.

Switchable microwave photonic filter between high Q bandpass filter and notch filter with flat passband based on phase modulation.

We propose and demonstrate a novel switchable microwave photonic filter based on phase modulation. Both a microwave high Q bandpass filter and a microwave notch filter with flat passband are achieved respectively. And the switchability between them by tuning the two tunable optical bandpass filters is demonstrated.

All-optical UWB generation and modulation using SOA-XPM effect and DWDM-based multi-channel frequency discrimination.

An all-optical UWB pulses generation and modulation scheme using cross phase modulation (XPM) effect of semiconductor optical amplifier (SOA) and DWDM-based multi-channel frequency discrimination is proposed and demonstrated, which has potential application in multiuser UWB-Over-Fiber communication systems. When a Gaussian pulse light and a wavelength-tunable CW probe light are together injected into the SOA, the probe light out from the SOA will have a temporal chirp due to SOA-XPM effect. When the chirped probe light is tuned to the slopes of single DWDM channel transmittance curve, the optical phase modulation to intensity modulation conversion is achieved at DWDM that serves as a multi-channel frequency discriminator, the inverted polarity Gaussian monocycle and doublet pulse is detected by a photodetector, respectively.

Ultrahigh-Q microwave photonic filter with Vernier effect and wavelength conversion in a cascaded pair of active loops.

A new cascaded microwave photonic filter that can realize a high Q value is presented. It consists of two infinite impulse response filters based on two active loops. Owing to wavelength conversion employing cross-gain modulation of the amplified spontaneous emission spectrum of the semiconductor optical amplifier in one loop, the interference between the modulated optical signals of different taps from two loops can be avoided, and stable transmission characteristics of the filter can then be achieved.