Stereo Camera Setup for 360° Digital Image Correlation to Reveal Smart Structures of Hakea Fruits

About forty years after its first application, digital image correlation (DIC) has become an established method for measuring surface displacements and deformations of objects under stress. To date, DIC has been used in a variety of in vitro and in vivo studies to biomechanically characterise biological samples in order to reveal biomimetic principles. However, when surfaces of samples strongly deform or twist, they cannot be thoroughly traced. To overcome this challenge, different DIC setups have been developed to provide additional sensor perspectives and, thus, capture larger parts of an object's surface. Herein, we discuss current solutions for this multi-perspective DIC, and we present our own approach to a 360° DIC system based on a single stereo-camera setup. Using this setup, we are able to characterise the desiccation-driven opening mechanism of two woody Hakea fruits over their entire surfaces. Both the breaking mechanism and the actuation of the two valves in predominantly dead plant material are models for smart materials. Based on these results, an evaluation of the setup for 360° DIC regarding its use in deducing biomimetic principles is given. Furthermore, we propose a way to improve and apply the method for future measurements.

Using Citizen Science to examine health and access to health care of uninsured patients in Germany

Background

Estimates suggest that numerous people live without health insurance in Germany. Existing evidence on uninsured patients’ health and care use is scarce, specifically in Germany. The present study involves citizens’ engagement to identify community perceptions of factors associated with health and medical care and to generate community-driven policy recommendations.

Methods

Representatives of civil society, affected patients and citizens (‘co-researchers') participate in a participatory health research project (MoveCitizenS) located in Bonn, Germany, using Photovoice and Community-based Mapping. The study is composed of five work packages over a 24-month period: (1) Photovoice workshops for co-researchers to produce, select and analyse photographs; (2) a series of workshops to conduct community-based mapping to identify barriers and facilitators of health care utilization; (3) workshops to co-design a cross-sectional survey of uninsured patients (n = 300); (4) project evaluation by co-researchers; (5) a dissemination strategy (e.g. advocacy event, exhibition) will be developed.

Results

Procedures to facilitate the active engagement of citizens and patients are discussed. Preliminary results on community perceptions of uninsured patients’ health and medical care and factors influencing health outcomes and care utilization are presented at the conference.

Conclusions

This is the first citizen science study which facilitates the understanding of barriers and enabling factors of good health and access to medical care for patients who lack health insurance coverage in Germany. This case study of a participatory project can be adapted to a range of settings to integrate local perspectives to improve population health for all.

Key messages

• Numerous patients in Germany are uninsured but evidence on their health and medical care is lacking.

• Using participatory methods to address these key questions is an important approach to generate suitable policy recommendations to meet the needs of the community and improve population health.