AC Loss in High-Temperature Superconducting Bulks Subjected to Alternating and Rotating Magnetic Fields.

High-temperature superconductor (HTS) bulks have demonstrated extremely intriguing potential for industrial and commercial applications due to their capability to trap significantly larger magnetic fields than conventional permanent magnets. The magnetic field in electrical rotating machines is a combination of alternating and rotational fields. In contrast, all previous research on the characterization of electromagnetic properties of HTS have solely engrossed on the alternating AC magnetic fields and the associated AC loss.

Epidemiological survey of mental disorders in the people aged 18 and older in Hebei Province.

Objective: To describe the time point prevalence and distribution of all types of mental disorders in Hebei Province.

Methods: From October 2004 to March 2005, stratified multi-stage cluster randomization was used to identify 24,000 subjects ≥18 years of age in Hebei Province. An expanded version of the General Health Questionnaire (GHQ-12) was used to identify subgroups of subjects at high, moderate and low risk of having a mental disorder, then psychiatrists determined their diagnoses by administering a structured psychiatric examination (SCID) that employs Diagnostic and Statistical Manual of Mental Disorder (DSM-IV).