ORCID Profile
0000-0003-0210-1860
Current Organisations
Universidade Federal de Minas Gerais
,
Institute of Materials Research and Engineering
,
National University of Singapore
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Publisher: Springer Science and Business Media LLC
Date: 06-12-2019
DOI: 10.1007/S00586-018-5850-3
Abstract: To investigate associations between anthropometric measures (birthweight, weight gain and current BMI) and back pain and to determine whether these associations differ between those born with low or full birthweight. The cross-sectional associations between the lifetime prevalence of back pain and anthropometric measures (birthweight, weight gain and current BMI) among 2754 adult twins were investigated in three stages: total s le within-pair case-control for monozygotic and dizygotic twins together and within-pair case-control analysis separated by dizygotic and monozygotic. Results were expressed as odds ratios (OR) and 95% confidence intervals (CI). Birthweight was not associated with back pain (OR 0.99 95% CI 0.99-1.00), but a weak association was found between weight gain (OR 1.01 CI 1.00-1.01) or current BMI (OR 1.02 95% CI 1.00-1.05) and back pain in the total s le analysis. These associations did not remain significant after adjusting for genetics. The associations did not differ between those whose were born with low or full birthweight. Birthweight was not associated with prevalence of back pain in adulthood. Weight gain and current BMI were weakly associated with back pain prevalence in the total s le analysis but did not differ between those born with low or full birthweight. However, the small-magnitude association only just achieved significance and appeared to be confounded by genetics and the early shared environment. Our results suggest that a direct link between these predictors and back pain in adults is unlikely. These slides can be retrieved under Electronic Supplementary Material.
Publisher: American Chemical Society (ACS)
Date: 25-06-2014
DOI: 10.1021/NL501460X
Abstract: We introduce the first plasmonic palette utilizing color generation strategies for photorealistic printing with aluminum nanostructures. Our work expands the visible color space through spatially mixing and adjusting the nanoscale spacing of discrete nanostructures. With aluminum as the plasmonic material, we achieved enhanced durability and dramatically reduced materials costs with our nanostructures compared to commonly used plasmonic materials such as gold and silver, as well as size regimes scalable to higher-throughput approaches such as photolithography and nanoimprint lithography. These advances could pave the way toward a new generation of low-cost, high-resolution, plasmonic color printing with direct applications in security tagging, cryptography, and information storage.
Publisher: IOP Publishing
Date: 05-03-2014
DOI: 10.1088/0957-4484/25/13/135303
Abstract: Dipole nano-antennas have predominantly been investigated in their lateral orientation with their long axes in plane with a supporting substrate. However, the response of coupled dipole antennas oriented vertically to a supporting substrate has so far been out of experimental reach. Here, we present a self-aligned electron-beam lithography technique for fabricating such antennas consisting of metal nanostructures on both sides of a suspended silicon nitride membrane. This 30 nm thick membrane provides an ultra-smooth metal/dielectric interface and uniformly defines the antenna feed-gap size in an array of antennas. It is also a suitable substrate for probing the nano-antenna response with monochromated electron energy-loss spectroscopy (EELS) in a transmission electron microscope. We provide details of this double-sided patterning process, and show the excitation of hybridized plasmon modes in EELS with electrons directed along, and at an angle to, the antenna axis.
Publisher: American Chemical Society (ACS)
Date: 18-08-2015
DOI: 10.1021/ACS.NANOLETT.5B02109
Abstract: Strong field enhancement and confinement in plasmonic nanostructures provide suitable conditions for nonlinear optics in ultracompact dimensions. Despite these enhancements, second-harmonic generation (SHG) is still inefficient due to the centrosymmetric crystal structure of the bulk metals used, e.g., Au and Ag. Taking advantage of symmetry breaking at the metal surface, one could greatly enhance SHG by engineering these metal surfaces in regions where the strong electric fields are localized. Here, we combine top-down lithography and bottom-up self-assembly to lodge single rows of 8 nm diameter Au nanoparticles into trenches in a Au film. The resultant "double gap" structures increase the surface-to-volume ratio of Au colocated with the strong fields in ∼2 nm gaps to fully exploit the surface SHG of Au. Compared to a densely packed arrangement of AuNPs on a smooth Au film, the double gaps enhance SHG emission by 4200-fold to achieve an effective second-order susceptibility χ((2)) of 6.1 pm/V, making it comparable with typical nonlinear crystals. This patterning approach also allows for the scalable fabrication of smooth gold surfaces with sub-5 nm gaps and presents opportunities for optical frequency up-conversion in applications that require extreme miniaturization.
Publisher: American Chemical Society (ACS)
Date: 03-03-2015
DOI: 10.1021/PH5004303
Publisher: Springer Science and Business Media LLC
Date: 16-09-2022
DOI: 10.1038/S41467-022-32719-W
Abstract: Controlling thermal transport is important for a range of devices and technologies, from phase change memories to next-generation electronics. This is especially true in nano-scale devices where thermal transport is altered by the influence of surfaces and changes in dimensionality. In superconducting nanowire single-photon detectors, the thermal boundary conductance between the nanowire and the substrate it is fabricated on influences all of the performance metrics that make these detectors attractive for applications. This includes the maximum count rate, latency, jitter, and quantum efficiency. Despite its importance, the study of thermal boundary conductance in superconducting nanowire devices has not been done systematically, primarily due to the lack of a straightforward characterization method. Here, we show that simple electrical measurements can be used to estimate the thermal boundary conductance between nanowires and substrates and that these measurements agree with acoustic mismatch theory across a variety of substrates. Numerical simulations allow us to refine our understanding, however, open questions remain. This work should enable thermal engineering in superconducting nanowire electronics and cryogenic detectors for improved device performance.
Publisher: Informa UK Limited
Date: 19-07-2022
DOI: 10.1080/09638288.2022.2098394
Abstract: To analyze the effectiveness of sports-focused interventions on the participation of children and adolescents with cerebral palsy (CP). Study searches were conducted on EMBASE, PubMed, Scielo, PEDro, CINAHL, SPORTDiscuss in June 2022. We included randomized controlled trials that investigated the effectiveness of sports-focused interventions in children and adolescents with CP in comparison with control. Risk of bias was assessed with PEDro scale and evidence certainty with GRADE approach. Data were pooled in random-effects meta-analyses and results were presented as standardized mean differences. Ten RCTs were selected with different modalities, mostly for ambulant children and adolescents. Significant pooled effects on participation in leisure-time physical activity were seen only in group interventions (modified sports, gross motor training, and fitness training), in comparison with control [SMD(95% CI) = 0.32(0.01-0.73) Positive results on leisure-time participation were seen at short-term follow-up for group interventions. Sports-focused interventions did not improve participation in other life areas, reinforcing the importance of specificity when conducting participation interventions. Studies investigating sports-focused interventions including non-ambulatory in iduals are still necessary. IMPLICATIONS FOR REHABILITATIONSports-focused interventions target leisure-time physical activity participation.They present moderate evidence of their effectiveness to improve physical activity participation in in iduals with cerebral palsy.Group interventions are effective in improving leisure-time physical activity participation.Sports-focused interventions did not improve participation in other life areas.
Publisher: Research, Society and Development
Date: 18-09-2022
DOI: 10.33448/RSD-V11I12.34356
Abstract: Aim: To translate, cross-cultural adapt and investigate the measurement properties of the 25-point Friendship Scale to Brazilian-Portuguese. Methods: Translation and adaptation of the 25-point Friendship Scale to Brazilian-Portuguese was conducted at first. Then, the new version was administered to 160 Brazilians to investigate test-retest reliability, internal consistency, standard error of the measurement (SEM), minimal detectable change (MDC), ceiling and floor effects, and concurrent validity. To investigate concurrent validity, the Brazilian–Portuguese version of the 0-100 EuroQol Visual Analog Scale (EQ VAS) was used to assess people’s self-reported health status. Results: The Brazilian-Portuguese version has good to excellent reliability (ICC of 0.76, 95% CI 0.61 – 0.85) and had moderate internal consistency (Cronbach’s alpha value of 0.78, 95% CI: 0.73 – 0.83). To avoid measurement error and to exceed variability, scores need to be greater than 1.33 (SEM) and 3.69 (MDC) on the 25-point scale, respectively. There was no ceiling and floor effects. For concurrent validity, there was a small positive correlation between the Friendship Scale and the EQ VAS (Spearman rs = 0.24 p .01). Conclusions: The new Brazilian–Portuguese version of the Friendship Scale has acceptable measurement properties to assess people over 18 years old’s perception of social isolation.
Publisher: The Optical Society
Date: 16-04-2014
DOI: 10.1364/OE.22.009809
Location: Brazil
Location: United States of America
No related grants have been discovered for Di Zhu.