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\"The town hall or city hall as a place of local governance is historically related to the founding of cities in medieval Europe. As the space of representative civic authority it aimed to set the terms of public space and engagement with the citizenry. In subsequent centuries, as the idea and built form travelled beyond Europe to become an established institution across the globe, the parameters of civic representation changed and the town hall was forced to negotiate new notions of urbanism and public space. City Halls and Civic Materialism: Towards a Global History of Urban Public Space utilizes the town hall in its global historical incarnations as bases to probe these changing ideas of urban public space. The essays in this volume provide an analysis of the architecture, iconography, and spatial relations that constitute the town hall to explore its historical ability to accommodate the \"public\" in different political and social contexts, in Europe, Asia, Australia, Africa and the Americas, as the relation between citizens and civic authority had to be revisited with the universal franchise, under fascism, after the devastation of the world wars, decolonization, and most recently, with the neo-liberal restructuring of cities.As a global phenomenon, the town hall challenges the idea that nationalism, imperialism, democracy, the idea of citizenship - concepts that frame the relation between the individual and the body politic -- travel the globe in modular forms, or in predictable trajectories from the West to East, North to South. Collectively the essays argue that if the town hall has historically been connected with the articulation of bourgeois civil society, then the town hall as a global spatial type -- architectural space, urban monument, and space of governance -- holds a mirror to the promise and limits of civil society. \"-- Provided by publisher.

A shift from fossil fuel to renewable energy is crucial in limiting global temperature increase to 2 °C above preindustrial levels. However, renewable energy technologies, solar photovoltaics, wind turbines, and electric vehicles are metal-intensive, and the mining and smelting processes to obtain the needed metals are emission-intensive. We estimate the future PM2.5 emissions from mining and smelting to meet the metal demand of renewable energy technologies in two climate pathways to be 0.3–0.6 Tg yr−1 in the 2020–2050 period, which are projected to contribute 10%–30% of total anthropogenic primary PM2.5 combustion emissions in many countries. The concentration of mineral reserves in a few regions means the impacts are also regionally concentrated. Rapid decarbonization could lead to a faster reduction of overall anthropogenic PM2.5 emissions but also could create more unevenness in the distributions of emissions relative to where demand occurs. Options to reduce metal-related PM2.5 emissions by over 90% exist and are well understood; introducing policy requiring their installation could avoid emission hotspots.

The continuing trend of exponential growth in data communications and processing are driving the need for large-scale heterogeneous integration. Similar to the trend we have observed in electronic integrated circuit development, we are witnessing a growing trend in 3D photonic integrated circuits (PICs) development in addition to that in 2D PICs. There are two main methods for fabricating 3D PICs. The first method, which utilizes ultrafast laser inscription (ULI), offers freeform shaping of waveguides in arbitrary contours and formations. The second method, which utilizes multilayer stacking and coupling of planar PICs, exploits relatively mature 2D PIC fabrication processes applied to each layer sequentially. Both the fabrication methods for 3D PICs have advantages and disadvantages such that certain applications may favor one method over the other. However, a joining of 2D PICs with 3D PICs can help develop integrated microsystems with new functionalities such as non-mechanical beam steering, space-division multiplexing (SDM), programmable arbitrary beam shaping, and photonic signal processing. We discuss examples of 3D PICs and 2D/3D integrated PICs in two applications: SDM via orbital-angular-momentum (OAM) multiplexing/demultiplexing and optical beam steering using optical phased arrays. Although a 2D PIC by itself can function as an OAM multiplexer or demultiplexer, it has limitations in supporting both polarizations. Alternatively, a 3D PIC fabricated by ULI can easily support both polarizations with low propagation loss. A combination of a 3D PIC and a 2D PIC designed and fabricated for OAM applications has successfully multiplexed and demultiplexed 15 OAM states to demonstrate polarization-diversified SDM coherent optical communications using multiple OAM states. Coherent excitation of multi-ring OAM states can allow highly scalable SDM utilizing Laguerre–Gaussian modes or linearly polarized (LP) modes. The preliminary fabrication of multi-ring OAM multiplexers and demultiplexers using the multilayer 3D PIC method and the ULI 3D PIC method has also been pursued. Large-scale (for example, 16×16 optical phased array) 3D PICs fabricated with the ULI technique have been demonstrated. Through these examples, we show that heterogeneous 2D/3D photonic integration retains the advantages of 2D PICs and 3D waveguides, which can potentially benefit many other applications. Photonics: Adding an extra dimension to photonic integrated circuits Researchers in the United States have demonstrated a combination of 2D and 3D microstructures that control the flow of light for ultrafast data processing. One common technique for fabricating these integrated photonic circuits is to use ultrafast lasers to write arbitrarily shaped optical circuitry directly into a dielectric material. A less-flexible alternative is to stack more-easily created 2D layers to form a 3D structure. S. J. Ben Yoo and his co-workers from the University of California, Davis, investigated how combining the 2D and 3D approaches could provide the best devices for certain applications. They applied this idea to build a multiplexer that combines beams with different orbital angular momentum and to demonstrate an optical beam steering module. The newly combined 2D/3D microsystem with optical path length matching enables it to support optical signal processing and transmission in the spatial, temporal, and spectral domains in both polarizations.

Background: Indications for removal of syndesmotic screws are not fully elucidated. This study aimed to determine factors related to elective syndesmotic screw removal. Methods: Patients who underwent fixation of ankle syndesmotic injuries were included. Screw removal was offered after a minimum of 12 weeks after surgery for pain, stiffness or patient desire to remove painful or broken hardware. Patient demographics, surgical data, distance of the syndesmotic screw from the joint, location of the screw at the physeal scar, and number of syndesmotic screws placed were collected for all patients. Bivariate and multivariate analyses were performed to determine the relationship between patient characteristics and screw removal and independent predictors of hardware removal. Results: Of 160 patients, 60 patients (38%) with an average age of 36.1 (range: 18-84) years underwent elective syndesmotic screw removal at a mean of 7 (range, 3-47) months after initial fixation. The most common reason for screw removal (50/60 patients) was ankle stiffness and pain (83%). Patients who underwent screw removal were more likely to be younger (36.1 years ± 13.0 vs 46.6 years ± 18.2, P < .001) and have a lower ASA score (2 ± 0.8 vs 2.1 ± 0.7, P = .003) by bivariate analysis. Of patients who underwent screw removal, 21.7% (13/60) had a broken screw at the time of removal. Whether the screw was placed at the physeal scar was not significantly associated with patient decision for hardware removal (P = .80). Conclusion: Younger and healthier patients were more likely to undergo elective removal of syndesmotic hardware. Screw distance from joint and screw placement at the physeal scar were not significantly associated with hardware removal. Level of Evidence: Level III, retrospective cohort study.

IntroductionIt is unclear whether the medial malleolus in unstable bi- and tri- malleolar ankle fractures without medial talar displacement should be addressed surgically. This study reviews a fixation protocol for the medial malleolar component of unstable bi- or tri- malleolar ankle fractures.Materials and methodsTwo hundred fifty-seven patients who sustained bi- (AO/OTA 44-B2) or tri- (AO/OTA 44-B3) malleolar ankle fractures between January 2005 and August 2019 at two Level 1 trauma centers were retrospectively identified. Medial malleolar fractures were defined as anterior, supra or intercollicular fractures based on the exit of the posterior fracture line. Fixation of the medial malleolar component was performed based on surgical algorithm. Only large or significantly displaced medial malleolar fractures were fixed if the soft tissues were amenable. Primary outcome measure was the presence of medial-sided ankle pain after operative or non-operative treatment of the medial malleolar fracture after a minimum follow up of 6 months. Presence of pain was defined by a pain score of 3 or higher on a 10-point VAS pain score at the site of the medial malleolar fracture.ResultsSignificantly more patients in the supracollicular group reported the presence of pain when this type was not fixed versus fixed (28 vs 14%, p = 0.0094). Significantly more patients in the anterior collicular subgroup reported the presence of pain when this type was fixed versus not fixed (40 vs 10%, p = 0.0438). There was no difference in the number of patients reporting pain in the intercollicular group when comparing those who were fixed versus not fixed, (21 vs 22%, p = 1.000).ConclusionsWhen examining post-operative pain, not all medial malleolar fractures require fixation when appropriately selected based on fracture pattern. Only 10% of patients with anterior collicular fractures reported pain after non operative management. Unsurprisingly, more patients in the supracollicular fractures reported pain without surgery compared to with surgery. Fracture pattern should be considered in the treatment algorithm for the medial malleolar component in bi- and tri- malleolar fractures.

The development of a real-time optical waveform measurement technique with quantum-limited sensitivity, unlimited record lengths and an instantaneous bandwidth scalable to terahertz frequencies would be beneficial in the investigation of many ultrafast optical phenomena. Currently, full-field (amplitude and phase) optical measurements with a bandwidth greater than 100 GHz require repetitive signals to facilitate equivalent-time sampling methods or are single-shot in nature with limited time records. Here, we demonstrate a bandwidth- and time-record scalable measurement that performs parallel coherent detection on spectral slices of arbitrary optical waveforms in the 1.55 µm telecommunications band. External balanced photodetection and high-speed digitizers record the in-phase and quadrature-phase components of each demodulated spectral slice, and digital signal processing reconstructs the signal waveform. The approach is passive, extendable to other regions of the optical spectrum, and can be implemented as a single silicon photonic integrated circuit. A measurement scheme that is capable of recording the amplitude and phase of arbitrary shaped optical waveforms with a bandwidth of up to 160 GHz is presented. The approach is compatible with integration on a silicon photonic chip and could aid the study of transient ultrafast phenomena.

Abstract Thin participatory processes are designed for information exchange. But complaint processes, message boards, and hotlines sometimes facilitate thick, meaningful engagement. Can policy design leverage factors driving engagement to enable values-based responses to complex policy problems, while allowing information exchange to continue as-needed for most participants? Using place-based case studies from oil and gas drilling and community complaints in three regions of Colorado, I make propositions about how the drivers of collaboration are related to the practice of engagement within participatory programs. Based on the case studies, presence of coercive policy actors, inclusion of multiple governmental authorities, and transparency in participatory communication are likely to facilitate thickening. Meanwhile, measurement-based responses to participation are likely to propagate thin participation only. Accordingly, in designing thin processes, policy makers should recognize the nature of engagement will depend on the type of knowledge exchanged and the suite of institutions that might use or leverage the participatory action.

The coronavirus disease 2019 (COVID-19) pandemic necessitated an unprecedented increase in the use of telehealth services in orthopedics. Patient attitudes toward and satisfaction with virtual orthopedic services remain largely unexplored. A prospective study of all orthopedic patients at a tertiary academic medical center who had a telehealth appointment between April 1, 2020, and May 5, 2020, was performed to assess patients' experience with a validated 21-item telehealth satisfaction questionnaire. The survey contained statements designed to assess patients' level of agreement with numerous aspects of telehealth, including convenience, the surgeon's ability to engage in care, ease of use, and future use of telehealth. Most respondents (86.7%) were satisfied with the telehealth system. The majority of patients expressed that the system is easy to use (90.0%), is convenient (86.7%), and saves them time (83.3%). Nearly all (95%) patients agreed that their surgeon could answer their questions with the use of this technology, although nearly half (46.6%) identified the lack of physical contact during the examination as problematic. Only 46.7% of patients agreed that telehealth should be a standard form of health care delivery in the future; these patients were found to have significantly longer commute times compared with those who did not (52.1±58.2 vs 28.3±19.2, P=.03). Patient perspectives on the widespread adoption of telehealth, such as ease of use, privacy protection, and convenience, showed that these anticipated barriers may be some of the greatest advantages of telehealth. The COVID-19 pandemic may have provided the momentum for telehealth to become a mainstay of orthopedic health care delivery in the future. [Orthopedics. 2021;44(5):e668–e674.]

Purpose When fully developed, kesterite photovoltaics will require large quantities of earth minerals including copper, zinc, tin, and sulfur to generate electricity. This leads to questions about which material options can maximize the environmental sustainability of devices. Molybdenum is used as the back contact in kesterite photovoltaic devices, but can cause a detrimental reaction with the absorber layer limiting conversion efficiency. As a result, numerous substitutes or solutions are suggested including carbon-based back contacts. While molybdenum back contacts have been characterized in past environmental assessments, the impacts of graphene and graphite in comparison were unknown. Of paramount interest is the fact that graphene is an emerging nanomaterial with the potential to provide game-changing benefits in a variety of fields; however, the potential for human and environmental health risks to be introduced by new applications remains uncertain. Methods We apply life cycle assessment (LCA) to the selection of photovoltaic back contacts for emergent solar devices. Specifically, we use TRACI 2.0 to analyze impacts associated with molybdenum, graphite, and graphene back contact alternatives. For data sources, we provide calculated unit processes for graphene and graphite back contacts and utilize open source life cycle databases including the United States Life Cycle Inventory. We explore the sensitivity of the model to assumptions regarding processes and inputs using sensitivity analysis and simulation. Results and discussion The results demonstrate that engineering factors, such as the amount of methane used in graphene production, as well as design factors, such as the thickness of potential graphite devices, can determine whether materials substitutions will result in environmental and health gains. Without improvements to graphene production methods, we find that graphene back contacts are associated with more significant health impacts. Graphite back contacts on the other hand are associated with increases in environmental indicators—though these increases are at levels that should not prove problematic in terms of overall impacts of solar photovoltaics. Conclusions In conclusion, both graphite and graphene back contacts would provide potential technological improvements, but present additional risks that may need to be considered. Specific attention to graphene chemical vapor deposition improvements as well as efforts to reduce the thickness of graphite back contacts to below 5 μm are necessary to ensure that improved technical efficiency does not jeopardize the social and environmental goals of solar photovoltaics.