Chemically Tuning Quantized Acoustic Phonons in 2D Layered MoO3 Nanoribbons.

Molybdenum trioxide (α-MoO3) is a 2D layered metal oxide that can be altered in color from transparent white to dark blue with reversible intercalation of zerovalent metals, and whose mechanical properties can be controlled through intercalation. Here, we use Brillouin laser light spectroscopy to map the entire angular dispersion curves of multiple acoustic phonon branches of 2D layered MoO3, directly probing the effects of phonon quantum confinement when the phonon wavelength is comparable to the material thickness. Since acoustic phonons dictate elasticity, we thereby determine the full elastic stiffness tensor and the thickness of each nanoribbon to a statistical precision (derived from standard error propagation) corresponding to less than a monolayer. We show how intercalation of metallic Sn, Co, and Cu can chemically tune the quantized acoustic phonons and elasticity of MoO3 nanoribbons. This work provides the methodology to extract precise elastic constants from complex Brillouin scattering of 2D materials, taking advantage of phonon confinement to capture the complete elastic response with a single scattering geometry.

Quantitative cancer risk assessment for occupational exposures to asphalt fumes during built-up roofing asphalt (BURA) operations.

The International Agency for Research on Cancer qualitatively characterized occupational exposure to oxidized bitumen emissions during roofing as probably carcinogenic to humans (Group 2A). We examine chemistry, exposure, epidemiology and animal toxicity data to explore quantitative risks for roofing workers applying built-up roofing asphalt (BURA). Epidemiology studies do not consistently report elevated risks, and generally do not have sufficient exposure information or adequately control for confounders, precluding their use for dose-response analysis. Dermal carcinogenicity bioassays using mice report increased tumor incidence with single high doses. In order to quantify potential cancer risks, we develop time-to-tumor model methods [consistent with U.S. Environmental Protection Agency (EPA) dose-response analysis and mixtures guidelines] using the dose-time-response shape of concurrent exposures to benzo[a]pyrene (B[a]P) as concurrent controls (which had several exposure levels) to infer presumed parallel dose-time-response curves for BURA-fume condensate. We compare EPA relative potency factor approaches, based on observed relative potency of BURA to B[a]P in similar experiments, and direct observation of the inferred BURA dose-time-response (scaled to humans) as means for characterizing a dermal unit risk factor. We apply similar approaches to limited data on asphalt-fume inhalation and respiratory cancers in rats. We also develop a method for adjusting potency estimates for asphalts that vary in composition using measured fluorescence. Overall, the various methods indicate that cancer risks to roofers from both dermal and inhalation exposure to BURA are within a range typically deemed acceptable within regulatory frameworks. The approaches developed may be useful in assessing carcinogenic potency of other complex mixtures of polycyclic aromatic compounds.

Impact of office productivity cloud computing on energy consumption and greenhouse gas emissions.

Cloud computing is usually regarded as being energy efficient and thus emitting less greenhouse gases (GHG) than traditional forms of computing. When the energy consumption of Microsoft's cloud computing Office 365 (O365) and traditional Office 2010 (O2010) software suites were tested and modeled, some cloud services were found to consume more energy than the traditional form. The developed model in this research took into consideration the energy consumption at the three main stages of data transmission; data center, network, and end user device. Comparable products from each suite were selected and activities were defined for each product to represent a different computing type. Microsoft provided highly confidential data for the data center stage, while the networking and user device stages were measured directly. A new measurement and software apportionment approach was defined and utilized allowing the power consumption of cloud services to be directly measured for the user device stage. Results indicated that cloud computing is more energy efficient for Excel and Outlook which consumed less energy and emitted less GHG than the standalone counterpart. The power consumption of the cloud based Outlook (8%) and Excel (17%) was lower than their traditional counterparts. However, the power consumption of the cloud version of Word was 17% higher than its traditional equivalent. A third mixed access method was also measured for Word which emitted 5% more GHG than the traditional version. It is evident that cloud computing may not provide a unified way forward to reduce energy consumption and GHG. Direct conversion from the standalone package into the cloud provision platform can now consider energy and GHG emissions at the software development and cloud service design stage using the methods described in this research.

Methodology to model the energy and greenhouse gas emissions of electronic software distributions.

A new electronic software distribution (ESD) life cycle analysis (LCA) methodology and model structure were constructed to calculate energy consumption and greenhouse gas (GHG) emissions. In order to counteract the use of high level, top-down modeling efforts, and to increase result accuracy, a focus upon device details and data routes was taken. In order to compare ESD to a relevant physical distribution alternative, physical model boundaries and variables were described. The methodology was compiled from the analysis and operational data of a major online store which provides ESD and physical distribution options. The ESD method included the calculation of power consumption of data center server and networking devices. An in-depth method to calculate server efficiency and utilization was also included to account for virtualization and server efficiency features. Internet transfer power consumption was analyzed taking into account the number of data hops and networking devices used. The power consumed by online browsing and downloading was also factored into the model. The embedded CO(2)e of server and networking devices was proportioned to each ESD process. Three U.K.-based ESD scenarios were analyzed using the model which revealed potential CO(2)e savings of 83% when ESD was used over physical distribution. Results also highlighted the importance of server efficiency and utilization methods.

Stakeholder understandings of wildfire mitigation: a case of shared and contested meanings.

This article identifies and compares meanings of wildfire risk mitigation for stakeholders in the Front Range of Colorado, USA. We examine the case of a collaborative partnership sponsored by government agencies and directed to decrease hazardous fuels in interface areas. Data were collected by way of key informant interviews and focus groups. The analysis is guided by the Circuit of Culture model in communication research. We found both shared and differing meanings between members of this partnership (the "producers") and other stakeholders not formally in the partnership (the "consumers"). We conclude that those promoting the partnership's project to mitigate risk are primarily aligned with a discourse of scientific management. Stakeholders outside the partnership follow a discourse of community. We argue that failure to recognize and account for differences in the way risk mitigation is framed and related power dynamics could hamper the communicational efforts of the collaborative partnership and impact goals for fuels reduction. We recommend ways that both groups can capitalize on shared meanings and how agency managers and decision makers can build better working relationships with interface communities and other external stakeholders.

New types of investments needed to address barriers to scaling up wildfire risk mitigation.

Background: Wildfire mitigation is becoming increasingly urgent, but despite the availability of mitigation tools, such as prescribed fire, managed wildfire, and mechanical thinning, the USA has been unable to scale up mitigation. Limited agency capacity, inability to work across jurisdictions, lack of public support, and procedural delays have all been cited as barriers to mitigation. But in the context of limited resources and increasing urgency, how should agencies prioritize investments to address these barriers? Results: To better understand different investments for scaling up mitigation, we examined how the wildfire problem is framed, building on existing social science demonstrating that agency approaches depend in part on how problems are framed. Using national-level policy documents and in-depth interviews, we found three ways of framing the barriers to scaling up mitigation, each emphasizing certain aspects of the problem and prioritizing different solutions or investments. The first framing, the Usual Suspects, focused on inadequate resources, cumbersome procedural requirements, delays due to litigation, and lack of public support. The solutions-to increase funding, streamline NEPA, limit litigation, and educate the public-suggest that more resources and fewer restrictions will enable agencies to scale up mitigation. The second framing, Agency-Agency Partnerships, focused on the ways that organizational structure and capacity constrain the development of effective cross-boundary collaboration. Here solutions prioritized organizational changes and capacity building to enable agencies to navigate different missions and build trust in order to develop shared priorities. The third framing, Engaging the Public, focused on lack of public support for mitigation, the need for meaningful public engagement and multi-stakeholder collaboration, and investments to build support to scale up mitigation. Conclusions: This analysis reveals that investing in collaborative capacity to advance agency-agency partnerships and public engagement might not slow down mitigation, but rather enable agencies to "go slow to go fast" by building the support and mechanisms necessary to increase the pace and scale of mitigation work. Reframing the wildfire problem through a careful analysis of competing frames and the underlying assumptions that privilege particular solutions can reveal a broader suite of solutions that address the range of key barriers.

Antecedentes: La mitigación de incendios es una tarea urgente, aunque a pesar de la disponibilidad de herramientas de mitigación, tales como quemas prescriptas, manejo del fuego, y raleos mecánicos, EEUU no ha sido aún capaz de aumentar proporcionalmente la mitigación de sus incendios. Las limitaciones en las capacidades de las agencias, la inhabilidad de trabajar entre jurisdicciones, la falta de apoyo de la sociedad, y demoras en los procedimientos, han sido citados como barreras para la mitigación. Ahora bien, en el contexto de recursos limitados e incrementos en las urgencias, ¿cómo deberían las agencias priorizar las inversiones para enfrentar esas barreras? Resultados: Para entender mejor las distintas inversiones para aumentar proporcionalmente las tareas de mitigación, examinamos cómo el problema de los incendios es enmarcado y construido en la ciencia social existente, demostrando que los enfoques de las agencias dependen, en parte, en cómo esos problemas son abordados. Usando documentos de políticas públicas y entrevistas profundas e intuitivas, encontramos tres vías de enmarcar las barreras para aumentar proporcionalmente la mitigación, cada una enfocando ciertos aspectos del problema y priorizando diferentes soluciones o inversiones. El primer enfoque, las "Sospechas Habituales", estuvo orientado hacia la inadecuación de los recursos, procedimientos incómodos, demoras debidas a litigios, y la falta de respaldo público. Las soluciones -incrementar los recursos, simplificar los procedimientos de la ley ambiental, limitar los litigios, y educar al público- sugieren que más recursos y menos restricciones permitirán a las agencias aumentar proporcionalmente la mitigación. El segundo enfoque "Asociación Agencia-Agencia", se orientó en la forma en que la estructura organizacional y su capacidad condicionan el desarrollo de una colaboración efectiva entre agencias. La solución aquí prioriza los cambios organizacionales y la capacidad de construcción para permitir a las agencias acometer diferentes misiones y crear confianza para poder desarrollar prioridades compartidas. El tercer enfoque "Comprometer al Público" se enfoca en la falta de apoyo del público para la mitigación, y la necesidad de atraer al público y la colaboración de diferentes ciudadanos interesados, en realizar aportes necesarios para construir aportes para el desarrollo de prioridades de mitigación. Conclusiones: Este análisis revela que la inversión en capacidad colaborativa para avanzar en la asociación agencia-agencia y el compromiso público puede no reducir la mitigación, más sin embargo permitir a las agencias "ir despacio para ir más rápido" para construir el soporte y mecanismos necesarios para incrementar la velocidad y la escala del trabajo de mitigación. Reencuadrar el problema de los incendios forestales a través de un cuidadoso análisis de encajes competitivos y suposiciones subyacentes que privilegie soluciones particulares, puede revelar un más amplio conjunto de soluciones que atienda el rango de barreras claves.

"Re-placed" - Reconsidering relationships with place and lessons from a pandemic.

The Covid-19 pandemic has prompted a reconsideration, perhaps even a fundamental shift in our relationships with place. As people worldwide have experienced 'lockdown,' we find ourselves emplaced in new and complex ways. In this Commentary, we draw attention to the re-working of people-place relations that the pandemic has catalysed thus far. We offer insights and suggestions for future interdisciplinary research, informed by our diverse positionalities as researchers based in different continents employing diverse approaches to people-place research. The article is structured in two sections. First, we consider theoretical aspects of our current relationships to place by proposing a framework of three interdependent axes: emplacement-displacement, inside-outside, and fixity-flow. Second, we identify six implications of these dialectics: for un-making and re-making 'home'; precarity, exclusion and non-normative experiences of place; a new politics of public space; health, wellbeing and access to 'outside' recreational spaces; re-sensing place, virtual escapes and fluid places, and methodological and ethical considerations. Across these topics, we identify 15 key questions to guide future research. We conclude by asserting that learning lessons from the global pandemic is necessarily tentative, requiring careful observation of altered life circumstances, and will be deficient without taking relationships with place into account.

Understanding social complexity within the wildland-urban interface: a new species of human habitation?

The lack of knowledge regarding social diversity in the Wildland Urban Interface (WUI) or an in-depth understanding of the ways people living there interact to address common problems is concerning, perhaps even dangerous, given that community action is necessary for successful wildland fire preparedness and natural resource management activities. In this article, we lay out the knowledge and preliminary case study evidence needed to begin systematically documenting the differing levels and types of adaptive capacity WUI communities have for addressing collective problems such as wildland fire hazard. In order to achieve this end, we draw from two theoretical perspectives encompassing humans' interactions with their environment, including (1) Kenneth Wilkinson's interactional approach to community, (2) and certain elements of place literature. We also present case study research on wildfire protection planning in two drastically different California communities to illustrate how social diversity influences adaptive capacity to deal with hazards such as wildland fire. These perspectives promote an image of the WUI not as a monolithic entity but a complex mosaic of communities with different needs and existing capacities for wildland fire and natural resource management.

Use of a portable forced air system to convert existing hospital space into a mass casualty isolation area.

STUDY OBJECTIVE: Patients with communicable diseases may require respiratory isolation to reduce the chance of transmission to health care workers and the public. This project was conducted to determine whether negative-pressure isolation for multiple patients can be achieved quickly and effectively using general hospital space not previously dedicated to respiratory isolation. METHODS: The physical therapy gymnasium was the area designated to test the ability to create a negative-pressure isolation environment in a large space. The conversion was planned in advance of an unscheduled drill to convert the space. Four high-efficiency particulate air (HEPA) filtered forced air machines were used to generate negative pressure. The units were vented to the outside air by a 25-foot length of 10-inch-diameter reusable duct. We evaluated the time needed for equipment setup and room conversion and noted any subjective difficulty with either setup or operation of the equipment. We measured the ability of the equipment to generate a negative air pressure relative to adjacent areas and determined the noise levels created during the use of different combinations of machines at various power settings. RESULTS: After drill activation and the request for equipment setup, 1 hour was required to convert the physical therapy gymnasium into an operational negative-pressure environment. The room pressure readings "high" power ranged from -1.5 to -13 Pa (-0.006 to -0.052 inches of water), and noise levels ranged from 70 to 76 dB. Calculated air changes per hour using 1, 2, 3, or 4 units running simultaneously at "high" power were 4.1, 8.2, 12.3, and 16.4, respectively. Using 4 units at once running at "low" power setting yielded 8.2 air changes per hour and generated a room pressure reading of -8.0 Pa, or -0.032 inches of water. CONCLUSION: Portable HEPA filtered forced air units are an effective means of creating large patient care areas with the negative-pressure environment required for respiratory isolation. This design results in a significantly lower-cost alternative compared with construction of individual rooms or units with similar capability and can be retrofitted to existing space. This type of unit would allow treatment of many more patients than current hospital capability would permit and would be an important asset in meeting the needs created by bioterrorism or a naturally occurring epidemic.

An event-based approach for examining the effects of wildland fire decisions on communities.

Public concern over the consequences of forest fire to wildland interface communities has led to increased resources devoted to fire suppression, fuel treatment, and management of fire events. The social consequences of the decisions involved in these and other fire-related actions are largely unknown, except in an anecdotal sense, but do occur at a variety of temporal and social organizational scales. These consequences are not limited to the fire event itself. Preparation for the possibility of a fire, actions that suppression agencies take during a fire, and postfire decisions all have consequences, if unknown currently. This article presents an "event-based" approach that can be useful for constructing and systematic discussion about the consequences of wildland fire to human communities. For each of the three major periods within this approach, agencies, communities, and individuals make decisions and take actions that have consequences. The article presents an integrated, temporally based process for examining these consequences, which is similar to others developed in the natural hazards and disaster management literature.