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Sustainability has become a major goal of domestic and international development. This essay analyzes the transitions of normative ideas embedded in the notion of sustainability by reviewing the discourses in the representative reports and literature from different periods. Three sets of ideas are proposed: inter- and intra-generational equity, stability of public systems, and a sense of solidarity, which confirms the scope of community and functions as a precondition for the previous two ideas. This essay uses the case of a health system in a hypothetical country to illustrate that, besides securing financial sustainability, a genuinely sustainable public system must also meet the three normative ideas of sustainability. This essay also finds that these three ideas may create intrinsic tensions within the prevalent policy-making model—democracy. The pursuit of sustainability is not only the responsibility of a democratic government, but also a shared moral obligation of the body politic.

Mandatory vaccination has been a highly disputed policy for tackling infectious diseases. Here I argue that a universal mandatory vaccination policy for the general public against the COVID-19 pandemic is ethically preferable when grounded in the concept of solidarity, which is defined by Barbara Prainsack and Alena Buyx as an enacted commitment to a relevant respect recognized by a group of individuals with equal moral status. This approach is complementary to utilitarian accounts and could better address other reasonable oppositions to mandatory vaccination. From a solidaristic account, the recognized relevant respect is to end the COVID-19 pandemic as soon as possible. This group of individuals would be willing to carry costs to assist each other in this respect, and a mandatory vaccination policy could be their institutionalized mutual assistance. The costs to be carried include both the financial costs of vaccination and the health costs stemming from potential adverse events and scientific uncertainties. The proposed social health insurance similarity test suggests the degree of coercion the mandatory vaccination policy could undertake within each state’s specific legal and judicial context. (Am J Public Health. 2022;112(2):255–261. https://doi.org/10.2105/AJPH.2021.306578 )

A series of novel anti-corrosive coatings were synthesized successfully. Water-borne polyurethane (WPU) was synthesized using polyethylene glycol and modified by grafting benzotriazole (BTA) as a pendant group (WPU-g-BTA) and N-alkylated amines (ethylene diamine (A), diethylene triamine (B), triethylene tetramine (C)) as side-chain extenders. Fourier-transform infrared spectroscopy, thermogravimetry, and dynamic mechanical analyses were used to characterize the structural and thermomechanical properties of the samples. A gas permeability analyzer (GPA) was used to evaluate molecular barrier properties. The corrosion inhibition performance of WPU-g-BTA-A, WPU-g-BTA-B, and WPU-g-BTA-C coatings in 3.5 wt% NaCl solution was determined by electrochemical measurements. WPU-g-BTA-C coating synthesized with a high cross-linking density showed superior anticorrosive performance. The as-prepared coatings exhibited a very low icorr value of 0.02 µA.cm−2, a high Ecorr value of −0.02 V, as well as excellent inhibition efficiency (99.972%) and impedance (6.33 Ω) after 30 min of exposure.

In this study, a high-performance H2S sensor that operates at RT was successfully fabricated using biodegradable electroactive polymer-polyurethane-urea (PUU) and PUU-activated-carbon (AC) composites as sensitive material. The PUU was synthesized through the copolymerization of biodegradable polycaprolactone diol and an electroactive amine-capped aniline trimer. AC, with a large surface area of 1620 m2/g and a pore diameter of 2 nm, was derived from coconut-shell waste. The composites, labeled PUU-AC1 and PUU-AC3, were prepared using a physical mixing method. The H2S-gas-sensing performance of PUU-AC0, PUU-AC1, and PUU-AC3 was evaluated. It was found that the PUU sensor demonstrated good H2S-sensing performance, with a sensitivity of 0.1269 ppm−1 H2S. The H2S-gas-sensing results indicated that the PUU-AC composites showed a higher response, compared with PUU-AC0. The enhanced H2S-response of the PUU-AC composites was speculated to be due to the high surface-area and abounding reaction-sites, which accelerated gas diffusion and adsorption and electron transfer. When detecting trace levels of H2S gas at 20 ppm, the sensitivity of the sensors based on PUU-AC1 and PUU-AC3 increased significantly. An observed 1.66 and 2.42 times’ enhancement, respectively, in the sensors’ sensitivity was evident, compared with PUU-AC0 alone. Moreover, the as-prepared sensors exhibited significantly high selectivity toward H2S, with minimal to almost negligible responses toward other gases, such as SO2, NO2, NH3, CO, and CO2.

Publicly-funded health systems, including those national health services and social or National Health Insurances, are institutionalized solidarity in health. In Europe, solidarity originated from the legacies of labor movements, the Judeo-Christian traditions, and nationalist sentiments in the re-construction Era after the WWII. In middle-to-high income East Asian countries, such as Japan, Taiwan, Korea, the health systems were built on different grounds and do not have such ethical origins of solidarity. As health systems in Europe and East Asia are both facing sustainability crises due to aging population, stagnant economy, changing boundaries, and advancing medical technologies, how those systems with the European solidaristic ethical traditions can be revived and how those without the European traditions could survive become a matter of theoretical interests and an urgent policy problem to be addressed. Drawing on contemporary theories of solidarity, this essay analyzes the boundary problem and its impact on the sustainability of the health system in Taiwan. It then considers two plausible origins of solidarity in Taiwan. One is the re-emerged civic nationalism, and the other is an ethos of common life. It is argued that after years of implementation, the National Health Insurance in Taiwan might have shaped the social values and people’s habits and formed an ethos of common life. Such ethos could be an ethical origin of solidarity in non-western societies and help the health systems endure the prolonged sustainability crises.

This study reported domestic and overseas Taiwanese people’s perceived stress levels and examined the mediation effect of their coping strategies during the early stages of the COVID-19 pandemic. We recruited 2727 Taiwanese respondents from the COVIDiSTRESS Global Survey (N = 173,426) between March 30 and May 30, 2020. The self-report questionnaire included a modified 10-item Perceived Stress Scale and a 16-item coping strategy scale. Three stress-coping factors were extracted with principal component analysis and confirmatory factor analysis. Their effects were examined through a regression and mediation analysis. The overseas Taiwanese participants had a significantly higher stress level than domestic counterparts (2.89 to 2.69 in 1–5 scale, p < 0.001). Government guidance was associated with lower stress level among domestic (− 0.097, 95% C.I. [− 0.131, − 0.063]) but not overseas Taiwanese (0.025, [− 0.114, 0.163]). The association of stress level with residency was mediated by coping strategies, for government guidance (0.04, [0.01, 0.07], ref: domestic participants) and supportive social networks (− 0.03, [− 0.05, − 0.01]). All results hold after the propensity score matching on samples. Government guidance on COVID-19 as a channel for coping with stress is correlated with the residency status of the respondents. Public health authorities should recognize the importance of various mental health interventions during pandemics.

Hydrogen sulfide (H2S) is a highly toxic and corrosive gas generated in numerous industrial and environmental processes; rapid, sensitive detection at low ppm levels is therefore crucial for ensuring occupational safety and protecting public health. This work explores the effect of grafting various loadings of pendant aniline tetramer pendants (PEDA) onto electroactive poly(amic acid) (EPAA) films and evaluates their performance as H2S gas sensors. Comprehensive characterization including ion trap mass spectrometry (Ion trap MS), Fourier-transform infrared spectroscopy (FTIR), cyclic voltammetry (CV), and four-probe conductivity measurements, confirmed successful PEDA incorporation and revealed enhanced electrical conductivity with increasing PEDA content. Gas sensing tests revealed that EPAA3 (3 wt% PEDA) achieved the best overall performance toward 10 ppm H2S, producing a 591% response with a rapid 108 s response time. Selectivity studies showed that the response of EPAA3 to H2S exceeded those for SO2, NO2, NH3, and CO by factors of five to twelve, underscoring its excellent discrimination against common interferents. Repeatability tests over five successive cycles gave a relative standard deviation of just 7.4% for EPAA3, and long-term stability measurements over 16 days in ambient air demonstrated that EPAA3 retained over 80%. These findings establish that PEDA-grafted PAA films combine the processability of poly(amic acid) with the sharp, reversible redox behavior of pendant aniline tetramers, delivering reproducible, selective, and stable H2S sensing. EPAA3, in particular, represents a balanced composition that maximizes sensitivity and durability, offering a promising platform for practical environmental monitoring and industrial safety applications.

This paper comments on Naoki Ikegami's editorial entitled \"Financing long-term care: lessons from Japan.\" Adding to the editorial, this paper focuses on analyzing the political and cultural foundations of long-term care (LTC) reform. Intergenerational solidarity and inclusive, prudential public deliberation are needed for the establishment or reform of LTC systems. Among various lines of ethical reasoning related to LTC, Confucian ethics and other familist ethics are specifically important in the societies that share these values. The core issue in the debates around LTC reform is how to (re-)define the scope of social entitlements and accordingly to allocate the responsibility for care between states and families, between social groups, and between generations with limited resources.

In this paper, carbon aerogel (CA)-polyaniline (PANI) composites were prepared and first applied in the study of H2S gas sensing. Here, 1 and 3 wt% of as-obtained CA powder were blended with PANI to produce composites, which are denoted by PANI-CA-1 and PANI-CA-3, respectively. For the H2S gas-sensing studies, the interdigitated electrode (IDE) was spin-coated by performing PANI and PANI-CA composite dispersion. The H2S gas-sensing properties were studied in terms of the sensor’s sensitivity, selectivity and repeatability. IDE coated with PANI-CA composites, as compared with pristine PANI, achieved higher sensor sensitivity, higher selectivity and good repeatability. Moreover, composites that contain higher loading of CA (e.g., 3 wt%) perform better than composites with lower loading of CA. At 1 ppm, PANI-CA-3 displayed increased sensitivity of 452% at relative humidity of 60% with a fast average response time of 1 s compared to PANI.

In this paper, a series of polyaniline (PANI)/Ti3C2 MXene composites (PMCs) with a biomimetic structure were prepared and employed as an anticorrosion coating application. First, the PANI was synthesized by oxidative polymerization with ammonium persulfate as the oxidant. Then, 2D Ti3C2 MXene nanosheets were prepared by treating the Ti3AlC2 using the optimized minimally intensive layer delamination (MILD) method, followed by characterization via XRD and SEM. Subsequently, the PMC was prepared by the oxidative polymerization of aniline monomers in the presence of Ti3C2 MXene nanosheets, followed by characterization via FTIR, XRD, SEM, TEM, CV, and UV–Visible. Eventually, the PMC coatings with the artificial biomimetic surface structure of a macaw feather were prepared by the nano-casting technique. The corrosion resistance of the PMC coatings, evaluated via Tafel polarization and Nyquist impedance measurements, shows that increasing the MXene loading up to 5 wt % shifts the corrosion potential (Ecorr) on steel from −588 mV to −356 mV vs. SCE, reduces the corrosion current density (Icorr) from 1.09 µA/cm2 to 0.035 µA/cm2, and raises the impedance modulus at 0.01 Hz from 67 kΩ to 3794 kΩ. When structured with the hierarchical feather topography, the PMC coating (Bio-PA-MX-5) further advances the Ecorr to +103.6 mV, lowers the Icorr to 7.22 × 10−4 µA/cm2, and boosts the impedance to 96,875 kΩ. Compared to neat coatings without biomimetic structuring, those with engineered biomimetic surfaces showed significantly improved corrosion protection performance. These enhancements arise from three synergistic mechanisms: (i) polyaniline’s redox catalysis accelerates the formation of a dense passive oxide layer; (ii) MXene nanosheets create a tortuous gas barrier that cuts the oxygen permeability from 11.3 Barrer to 0.9 Barrer; and (iii) the biomimetic surface traps air pockets, raising the water contact angle from 87° to 135°. This integrated approach delivers one of the highest combined corrosion potentials and impedance values reported for thin-film coatings, pointing to a general strategy for durable steel protection.