BACKGROUNDOlder migrants in China without local resident registration (hukou) are a vulnerable population and face barriers to receiving local healthcare.OBJECTIVESWe aimed to quantify the disparities in healthcare utilization between older migrants and local residents in Shanghai, China.DESIGNThis was a cross‐sectional study.SETTINGThe study was conducted in Shanghai, China, in 2016.PARTICIPANTSOlder adults (aged ≥60 years) were recruited based on a three‐stage stratified cluster sampling method (2571 older locals and 1920 older migrants).MEASUREMENTSWe compared utilization of outpatient care, inpatient care, preventive care, emergency room (ER) admission, and dental care, as well as medication use between older migrants and local residents. The local‐migrant gap was parsed into observed and unobserved components using the Blinder‐Oaxaca decomposition method.RESULTSOlder migrants were less likely to utilize outpatient (odds ratio [OR] = 0.757; 95% confidence interval [CI] = 0.617‐0.928), inpatient (OR = 0.642; 95% CI = 0.443‐0.931), and preventive care (OR = 0.743; 95% CI = 0.643‐0.858) and were more likely to use medication (OR = 1.254; 95% CI = 1.089‐1.445) than local residents. Differences in ER admissions and dental care utilization were not significant in the regression analysis. The decomposition results indicated that 55% and 71% of the local‐migrant gap in outpatient and preventive care utilization were attributable to individual characteristics, like health insurance. Unobserved components, including hukou‐related factors and personal heterogeneous preferences, contributed 59% and 63% to utilization of inpatient care and medication use, respectively.CONCLUSIONWe identified local‐migrant gaps in healthcare utilization among older adults in China. Further research is needed into integration of the health insurance system, accessibility of public health welfare benefits, and reconstruction of social networks among older migrants. J Am Geriatr Soc 68:1560‐1567, 2020.

Using the angular spectrum theory and experimental velocity data of surface acoustic waves (SAW) on YZ-LiNbO(3), the focusing characteristics of a circular-arc interdigital transducer have been demonstrated. The calculated results show that the depth of focus is long and the compressed acoustic beam width is very narrow. The concept of a caustic is shown to be an excellent way of characterizing SAW focusing by a circular-arc interdigital transducer on YZ-LiNbO(3). Comparison between theoretical and experimental results shows good agreement.

No abstract

ZIIONG-NAN Lu (b), and DUAN FENG (a)Nb/Cu superlattices with modulation wavelength in the range 1 to 30nm are synthesized by magnetron sputtering. Both, X-ray diffraction and ion mill Auger electron spectroscopy techniques are used to determine the structure of the superlattices. The X-ray experiments reveal two anomalous expansions in the average lattice spacing a t modulation wavelengths R = 2 and 8 nm. Ultrasonic measurements of the surface-acoustic-wave (SAW) velocities in the superlattices show that surface phonons soften a t the same two modulation wavelengths. A preliminary explanation of the experimental results is presented.Nb/Cu-Supergitter mit Modulationswellenligen im Bereich 1 bis 30 nm werden mittels Magnetronsputtering synthetisiert. Sowohl Rontgenbeugung als auch Ionenzerstiiubungs-Augerelektronenspektroskopie werden benutzt, um die Struktur der Supergitter zu bestimmen. Die Rontgenexperimente zeigen zwei anomale Expansionen im mittleren Gitterabstand bei Modulationswellenliingen t = 2 und 8 nm. Die Ultraschallmessungen der Geschwindigkeiten der akustischen Oberfliichenwellen (SAW) in den Supergittern zeigen, daB Oberfliichenphononen bei denselben beiden Modulationswellenliingen erweichen. Eine vorliiufige Erkliirung der experimentellen Ergebnisse wird angegeben.