Complexity of Measuring and Representing the Hygroscopicity of Mixed Component Aerosol

The validation of approaches to predict the hygroscopicity of complex mixtures of organic components in aerosol is important for understanding the hygroscopic response of organic aerosol in the atmosphere. We report new measurements of the hygroscopicity of mixtures of dicarboxylic acids and amino acids using a comparative kinetic electrodynamic balance (CK-EDB) approach, inferring the equilibrium water content of the aerosol from close to a saturation relative humidity (100%) down to 80%. We show that the solution densities and refractive indices of the mixtures can be estimated with an accuracy of better than ±2% using the molar refractive index mixing rule and densities and refractive indices for the individual binary organic–aqueous solutions. Further, we show that the often-used mass-, volume-, and mole-weighted mixing rules to estimate the hygroscopicity parameter κ can overestimate the hygroscopic parameter by a factor of as much as 3, highlighting the need to understand the specific nonideal interactions that may arise synergistically in mixtures and cannot be represented by simple models. Indeed, in some extreme cases the hygroscopicity of a multicomponent mixture can be very close to that for the least hygroscopic component. For mixtures of similar components for which no additional synergistic interactions need be considered, the hygroscopicity of the mixed component aerosol can be estimated with high accuracy from the hygroscopic response of the binary aqueous–organic aerosol. In conclusion, we suggest that the hygroscopicity of multicomponent organic aerosol can be highly nonadditive and that simple correlations of hygroscopicity with composition may often misrepresent the level of complexity essential to interpreting aerosol hygroscopicity

Community-led housing and health: a comprehensive literature review

This report examines existing literature on the relationship between community-led housing (CLH) and health and wellbeing, with a particular focus on identifying what evidence is available and where future research may further strengthen this knowledge base. CLH has gained attention at both citizen and government scale in recent years (Fromm, 2012; Tummers, 2016). As shortages in affordable housing for sale and rent have become acutely apparent, alternative approachesto housing delivery have received greater recognition (Cerulli and Field, 2011). The studies included in this review create a strong foundation of evidence on the relationship between CLH and health and wellbeing

Patients' and healthcare professionals' views on a specialist smoking cessation service delivered in a United Kingdom hospital: a qualitative study

BACKGROUND: Hospital admission provides a powerful opportunity to promote smoking cessation. We explored patients' and healthcare professionals' (HCP) views of a specialist smoking cessation service comprising systematic smoking ascertainment, default provision of pharmacotherapy and behavioural counselling at the bedside, and post-discharge follow-up, in a clinical trial in a United Kingdom teaching hospital. METHODS: Semi-structured interviews with 30 patients who were offered the intervention, and 27 HCPs working on intervention wards, were audio-recorded, transcribed verbatim and analysed using thematic analysis. RESULTS: The shock of being admitted, and awareness that smoking may have contributed to the need for hospital admission, caused many patients to reassess their quit intentions. Most patients felt the service was too good an opportunity to pass up, because having long-term support and progress monitored was more likely to result in abstinence than trying alone. Had they not been approached, many patients reported that they would have attempted to quit alone, though some would have been discouraged from doing so by pharmacotherapy costs. Service delivery by a specialist advisor was favoured by patients and HCPs, largely because HCPs lacked time and expertise to intervene. HCPs reported that in usual practice, discussions about smoking were usually limited to ascertainment of smoking status. Timing of service delivery and improved co-ordination between service staff and inpatient ward staff were matters to address. CONCLUSIONS: A hospital-based specialist smoking cessation service designed to identify smokers and initiate cessation support at the bedside was deemed appropriate by patients and HCPs. TRIAL REGISTRATION: Trial registration: ISRCTN25441641

The relationship between housing created through Permitted Development Rights and health: A systematic review

BackgroundPermitted Development Rights are a regulatory mechanism in the English planning system where the use of a building can be changed bypassing the standard planning process. Other countries have similar arrangements. In England, no assessment of the health impacts has been completed.MethodologyThis systematic review provides the first overview of the health and wellbeing impacts of housing created through Permitted Development Rights. 1,999 literature items were identified from a structured search of 14 databases and manual searching for grey literature. Literature published between January 2013 and July 2020, in England, were eligible.ResultsEight academic and 13 grey literature items were included. The review identifies both a greater number of literature and greater number of ways permitted development conversions have negative compared to positive health impacts, and may contribute towards widening health inequalities. There is a lack of research directly with the occupants of housing created through Permitted Development Rights.ConclusionsThese findings provide an indication of the impacts of deregulating a planning system without explicitly considering health and wellbeing. They warrant further assessment of how to enable the change of a buildings use to take place whilst also ensuring the homes created are supportive of good health

Influence of organic compound functionality on aerosol hygroscopicity:dicarboxylic acids, alkyl-substituents, sugars and amino acids

Hygroscopicity data for 36 organic compounds, including amino acids, organic acids, alcohols and sugars, are determined using a comparative kinetics electrodynamic balance (CK-EDB). The CK-EDB applies an electric field to trap-charged aqueous droplets in a chamber with controlled temperature and relative humidity (RH). The dual micro dispenser set-up allows for sequential trapping of probe and sample droplets for accurate determination of droplet water activities from 0.45 to > 0.99. Here, we validate and benchmark the CK-EDB for the homologous series of straight-chain dicarboxylic acids (oxalic–pimelic) with measurements in better agreement with Universal Quasichemical Functional Group Activity Coefficients (UNIFAC) predictions than the original data used to parametrise UNIFAC. Furthermore, a series of increasingly complex organic compounds, with subtle changes to molecular structure and branching, are used to rigorously assess the accuracy of predictions by UNIFAC, which does not explicitly account for molecular structure. We show that the changes in hygroscopicity that result from increased branching and chain length are poorly represented by UNIFAC, with UNIFAC under-predicting hygroscopicity. Similarly, amino acid hygroscopicity is under-predicted by UNIFAC predictions, a consequence of the original data used in the parametrisation of the molecular subgroups. New hygroscopicity data are also reported for a selection of alcohols and sugars and they show variable levels of agreement with predictions

The Distance of the Gamma-ray Binary 1FGL J1018.6-5856

The recently discovered gamma-ray binary 1FGL J1018.6-5856 has a proposed optical/near-infrared (OIR) counterpart 2MASS 10185560-5856459. We present Stromgren photometry of this star to investigate its photometric variability and measure the reddening and distance to the system. We find that the gamma-ray binary has E(B-V) = 1.34 +/- 0.04 and d = 5.4^+4.6_-2.1 kpc. While E(B-V) is consistent with X-ray observations of the neutral hydrogen column density, the distance is somewhat closer than some previous authors have suggested.Comment: Accepted to PAS

Healthy buildings for a healthy city: Is the public health evidence base informing current building policies?

Research has demonstrated that housing quality is a key urban intervention in reducing health risks and improving climate resilience, addressing a key ambition of the United Nations Sustainable Development Goals. Yet housing quality remains a problem even in high income countries such as England. In particular, hazards such as excess cold, excess heat and lack of ventilation leading to damp and mould have been identified as a major issue in homes. Research shows that these hazards can lead to a range of health conditions, such as respiratory and cardiovascular disease, infections and mental health problems. This article explores the use of public health research and evidence in policy to regulate new buildings in England to deliver improved public health, climate resilience and a reduced carbon footprint, in particular exploring the policy drivers and awareness of the public health evidence. Findings show that public health evidence is hardly referenced in policy and that the focus on other evidence bases such as on climate mitigation in building regulations results in both positive and negative impacts on health. This reflects a lack of a systems approach around urban interventions leading to weaknesses in standards regulating the private development sector. In conclusion, this paper recommends: 1. the consideration of health impact in future building regulations; 2. the integration and coordination of key policies covering various scales and phases of the development processes and 3. the better education of residents to understand advances in new energy performance technologies

Engaging a wider public health workforce: Bringing public health into architecture education

BackgroundArchitects can play a key role in the wider public health workforce, in ensuring building and urban design is health promoting, however there is no requirement to teach health by architectural accreditation bodies.ObjectiveTo evaluate the impact of the Public Health Practitioner in Residence programme on the ability of a cohort of architecture alumni to create healthier buildings and places.MethodologyData was collected using questionnaires, a focus group, interviews, and programme documentation from a Bachelor of Architecture cohort (N=39) at intervals from 20112019. The evaluation uses the Reach, Effectiveness, Adoption, Implementation, Maintenance (RE-AIM) framework.ResultsParticipants developed and maintained a broad understanding of determinants of health, which bought greater personal satisfaction and ethical responsibility to their jobs. Career stage, firm size, project type, statutory requirements, resources, and the understanding of others in the architectural process affected the participants’ ability to improve health in practice.ConclusionsThese findings suggest the programme could and should be replicated in other educational institutions or advocate for changes in the national architecture curriculum. Evaluating health effects of developments, accessible evidence, engaging with the public, developers, financiers and landowners and making health more explicit in regulations could help integrate health into architecture education

STUDI EVALUATIF TENTANG MANAJEMEN SISTEM PERENCANAAN PENYUSUNAN PROGRAM DAN PEN6ANG6ARAN (SP4) PADA IKIP BANDUNG

While many studies have examined the barrier effects of large rivers on animal dispersal and gene flow, few studies have considered the barrier effects of small streams. We used displacement experiments and analyses of genetic population structure to examine the effects of first-order and second-order streams on the dispersal of terrestrial red-backed salamanders, Plethodon cinereus (Green, 1818). We marked red-backed salamanders from near the edges of one first-order stream and one second-order stream, and experimentally displaced them either across the stream or an equal distance farther into the forest. A comparison of return rates indicated that both streams were partial barriers to salamander movement, reducing return rates by approximately 50%. Analysis of six microsatellite loci from paired plots on the same side and on opposite sides of the second-order stream suggested that the stream did contribute to genetic differentiation of salamander populations. Collectively, our results imply that low-order streams do influence patterns of movement and gene flow in red-backed salamanders. We suggest that given the high density of first-order and second-order streams in most landscapes, these features may have important effects on species that, like red-backed salamanders, have limited dispersal and large geographic ranges