Now showing items 21-40 of 67632

    • A new species of Hypoprepia from the mountains of central Arizona (Lepidoptera, Erebidae, Arctiinae, Lithosiini)

      Palting, John Douglas; Ferguson, Douglas C; Moore, Wendy; Univ Arizona, Grad Interdisciplinary Program Entomol & Insect S; Univ Arizona, Dept Entomol (PENSOFT PUBL, 2018-10-08)
      A new firefly-mimicking lichen moth of the genus Hypoprepia, H.lampyroides Palting & Ferguson, sp. n., is described from the mountains of east-central Arizona and the Sierra Madre Occidental of Mexico. Hypoprepia Hübner, 1831 is a North American genus of lithosiine tiger moths, previously consisting of five species: H.fucosa Hübner, 1831 and H.miniata (Kirby, 1837), both of eastern and central North America; H.cadaverosa Strecker, 1878 from the Rocky Mountains into New Mexico and west Texas; H.inculta H. Edwards, 1882, a widespread western USA species and H.muelleri Dyar, 1907 from the vicinity of Mexico City. The latter is herein synonymized under H.inculta (= H.muellerisyn. n.), resulting in the total number of taxa in the genus unchanged at five.
    • A new species of Euchaetes Harris from southern Arizona (Erebidae, Arctiinae)

      Nagle, Raymond B; Schmidt, B Christian; Univ Arizona, Dept Pathol (PENSOFT PUBL, 2018-10-08)
      Euchaetes nancyae sp. n. is described from southeastern Arizona. Although superficially similar to species of Pygarctia Grote, structural and molecular variation shows it to be most closely related to Euchaetes helena (Cassino). Adults, genitalic structure, e s, and first instar larvae are described and illustrated. The larval host plant remains unknown. Euchaetes helena is confirmed as occurring in Mexico.
    • Large-scale automated machine reading discovers new cancer-driving mechanisms

      Valenzuela-Escárcega, Marco A; Babur, Özgün; Hahn-Powell, Gus; Bell, Dane; Hicks, Thomas; Noriega-Atala, Enrique; Wang, Xia; Surdeanu, Mihai; Demir, Emek; Morrison, Clayton T; Univ Arizona, Dept Linguist; Univ Arizona, Sch Informat; Univ Arizona, Dept Mol & Cellular Biol (OXFORD UNIV PRESS, 2018-09-26)
      PubMed, a repository and search engine for biomedical literature, now indexes >1 million articles each year. This exceeds the processing capacity of human domain experts, limiting our ability to truly understand many diseases. We present Reach, a system for automated, large-scale machine reading of biomedical papers that can extract mechanistic descriptions of biological processes with relatively high precision at high throughput. We demonstrate that combining the extracted pathway fragments with existing biological data analysis algorithms that rely on curated models helps identify and explain a large number of previously unidentified mutually exclusive altered signaling pathways in seven different cancer types. This work shows that combining human-curated 'big mechanisms' with extracted 'big data' can lead to a causal, predictive understanding of cellular processes and unlock important downstream applications.
    • Postoperative chemoradiotherapy versus radiotherapy alone for elderly cervical cancer patients with positive margins, lymph nodes, or parametrial invasion

      Cushman, Taylor R; Haque, Waqar; Menon, Hari; Rusthoven, Chad G; Butler, E Brian; Teh, Bin S; Verma, Vivek; Univ Arizona, Coll Med Phoenix (KOREAN SOC GYNECOLOGY ONCOLOGY & COLPOSCOPY, 2018-11-01)
      Women with cervical cancer (CC) found to have positive surgical margins, positive lymph nodes, and/or parametrial invasion receive a survival benefit from postoperative chemoradiotherapy (CRT) vs. radiation therapy (RT) alone. However, older women may not benefit to the same extent, as they are at increased risk of death from non-oncologic causes as well as toxicities from oncologic treatments. This study sought to evaluate whether there was a survival benefit of CRT over RT in elderly patients with cervical cancer. Methods: The National Cancer Database was queried for patients >= 70 years old with newly diagnosed IA2, IB, or IIA CC and positive margins, parametrial invasion, and/or positive nodes on surgical resection. Statistics included logistic regression, Kaplan-Meier overall survival (OS), and Cox proportional hazards modeling analyses. Results: Altogether, 166 patients met inclusion criteria; 62 (37%) underwent postoperative RT and 104 (63%) underwent postoperative CRT. Younger patients and those living in areas of higher income were less likely to receive CRT, while parametrial invasion and nodal involvement were associated with an increased likelihood (p<0.05 for all). There were no OS differences by treatment type. Subgroup analysis by number of risk factors, as well as each of the 3 risk factors separately, also did not reveal any OS differences between cohorts. Conclusion: In the largest such study to date, older women with postoperative risk factor(s) receiving RT alone experienced similar survival as those undergoing CRT. Although causation is not implied, careful patient selection is paramount to balance treatment-related toxicity risks with theoretical outcome benefits.
    • Macroeconomic dynamics and the IS puzzle

      Hawkins, Raymond J.; Nguyen, Chau N.; Univ Arizona, Coll Opt Sci (KIEL INST WORLD ECONOMY, 2018-09-18)
      The authors solve the IS puzzle for the G7 countries. They find that five of the G7 countries have the expected significant negative relationship between the output gap and the realrate gap; the time series of the remaining two show material deviation from expected IS-curve behavior. The authors show that the observed time dependence of the interaction between the output and real-rate gaps can be represented in a parsimonious and practical manner using the theory of anelasticity that unifies partial-adjustment specifications of the IS curve.
    • Seizure-Induced Arc mRNA Expression Thresholds in Rat Hippocampus and Perirhinal Cortex

      Chawla, Monica K.; Gray, Daniel T.; Nguyen, Christie; Dhaliwal, Harshaan; Zempare, Marc; Okuno, Hiroyuki; Huentelman, Matthew J.; Barnes, Carol A.; Univ Arizona, Evelyn F McKnight Brain Inst; Univ Arizona, ARL Div Neural Syst Memory & Aging; Univ Arizona, Dept Psychol; Univ Arizona, Dept Neurol; Univ Arizona, Dept Neurosci (FRONTIERS MEDIA SA, 2018-11-01)
      Immediate-early genes (IEGs) are rapidly and transiently induced following excitatory neuronal activity including maximal electroconvulsive shock treatment (ECT). The rapid RNA response can be blocked by the sodium channel antagonist tetrodotoxin ( I I X), without blocking seizures, indicating a role for electrical stimulation in electroconvulsive shock-induced mRNA responses. In behaving animals, Arc mRNA is selectively transcribed following patterned neuronal activity and rapidly trafficked to dendrites where it preferentially accumulates at active synapses for local translation. Here we examined whether there is a relationship between the current intensities that elicit seizures and the threshold for Arc mRNA transcription in the rat hippocampus and perirhinal cortex (PRC). Animals received ECT of varying current intensities (0, 20, 40 65, 77 and 85 mA) and were sacrificed 5 min later. While significantly more CA1, CA3 and perirhinal pyramidal cells expressed Arc at the lowest stimulus intensity compared to granule cells, there was an abrupt threshold transition that occurred in all four regions at 77 mA. This precise threshold for Arc expression in all temporal lobe neurons examined may involve regulation of the calcium-dependent mechanisms that are upstream to activity-dependent IEG transcription.
    • Renal replacement therapy in patients with acute respiratory distress syndrome: a single-center retrospective study

      Dill, Joshua; Bixby, Billie; Ateeli, Huthayfa; Sarsah, Benjamin; Goel, Khushboo; Buckley, Ryan; Finkelshteyn, Ilya; Thajudeen, Bijin; Kadambi, Pradeep V; Bime, Christian; Univ Arizona, Dept Med, Div Pulm Allergy Crit Care & Sleep Med; Univ Arizona, Dept Med, Div Nephrol; Univ Arizona, Dept Med, Gen Internal Med (DOVE MEDICAL PRESS LTD, 2018)
      Patients with acute respiratory distress syndrome (ARDS) who develop acute kidney injury have increased mortality and frequently require renal replacement therapy (RRT). The optimal timing for initiation of RRT after onset o f ARDS to improve survival is not known. Methods: We retrospectively reviewed clinical data on patients admitted to our health system over a 2-year period. Individual charts were carefully reviewed to ascertain that patients met the Berlin criteria for ARDS and to categorize RRT utilization. The Kaplan Meier analysis was conducted to compare early (48 pound hours postintubation) versus late (>48 hours postintubation) initiation of RRT. Associations between RRT initiation and mortality were evaluated using Cox proportional hazards regression. Results: A total of 75 patients were identified with ARDS, 95% of whom received RRT. Mortality of patients who required RRT was 56%. The main indications for RRT initiation were fluid overload (75%), metabolic acidosis (64%), and hyperkalemia (33%). The Kaplan-Meier analysis comparing early initiation of RRT to late initiation of RRT showed no survival benefit. Cox proportional hazard models testing the association between timing of RRT initiation with survival and adjusting for sex, race, ethnicity, and Acute Physiology and Chronic Health Evaluation II score did not reach statistical significance (HR=0.94, 95% CI=0.48-1.86). Conclusion: Timing of RRT initiation was not associated with a survival benefit. Prospective study in the utilization and outcomes of RRT in ARDS could assist in optimizing its usage in this population.
    • Factors influencing performance by contracted non-state providers implementing a basic package of health services in Afghanistan.

      Salehi, Ahmad Shah; Saljuqi, Abdul Tawab Kawa; Akseer, Nadia; Rao, Krishna; Coe, Kathryn; Univ Arizona (BMC, 2018-10-05)
      Background: In 2002 Afghanistan's Ministry of Public Health (MoPH) and its development partners initiated a new paradigm for the health sector by electing to Contract-Out (CO) the Basic Package of Health Services (BPHS) to non-state providers (NSPs). This model is generally regarded as successful, but literature is scarce that examines the motivations underlying implementation and factors influencing program success. This paper uses relevant theories and qualitative data to describe how and why contracting out delivery of primary health care services to NSPs has been effective. The main aim of this study was to assess the contextual, institutional, and contractual factors that influenced the performance of NSPs delivering the BPHS in Afghanistan. Methods: The qualitative study design involved individual in-depth interviews and focus group discussions conducted in six provinces of Afghanistan, as well as a desk review. The framework for assessing key factors of the contracting mechanism proposed by Liu et al. was utilized in the design, data collection and data analysis. Results: While some contextual factors facilitated the CO (e.g. MoPH leadership, NSP innovation and community participation), harsh geography, political interference and insecurity in some provinces had negative effects. Contractual factors, such as effective input and output management, guided health service delivery. Institutional factors were important; management capacity of contracted NSPs affects their ability to deliver outcomes. Effective human resources and pharmaceutical management were notable elements that contributed to the successful delivery of the BPHS. The contextual, contractual and institutional factors interacted with each other. Conclusion: Three sets of factors influenced the implementation of the BPHS: contextual, contractual and institutional. The MoPH should consider all of these factors when contracting out the BPHS and other functions to NSPs. Other fragile states and countries emerging from a period of conflict could learn from Afghanistan's example in contracting out primary health care services, keeping in mind that generic or universal contracting policies might not work in all geographical areas within a country or between countries.
    • Colorado Plateau Coring Project, Phase I (CPCP-I): a continuously cored, globally exportable chronology of Triassic continental environmental change from western North America

      Olsen, Paul E.; Geissman, John W.; Kent, Dennis V.; Gehrels, George E.; Mundil, Roland; Irmis, Randall B.; Lepre, Christopher; Rasmussen, Cornelia; Giesler, Dominique; Parker, William G.; Zakharova, Natalia; Kürschner, Wolfram M.; Miller, Charlotte; Baranyi, Viktoria; Schaller, Morgan F.; Whiteside, Jessica H.; Schnurrenberger, Douglas; Noren, Anders; Brady Shannon, Kristina; O&amp;apos;Grady, Ryan; Colbert, Matthew W.; Maisano, Jessie; Edey, David; Kinney, Sean T.; Molina-Garza, Roberto; Bachman, Gerhard H.; Sha, Jingeng; Univ Arizona, Dept Geosci (COPERNICUS GESELLSCHAFT MBH, 2018-10-22)
      Phase 1 of the Colorado Plateau Coring Project (CPCP-I) recovered a total of over 850m of stratigraphically overlapping core from three coreholes at two sites in the Early to Middle and Late Triassic age largely fluvial Moenkopi and Chinle formations in Petrified Forest National Park (PFNP), northeastern Arizona, USA. Coring took place during November and December of 2013 and the project is now in its post-drilling science phase. The CPCP cores have abundant detrital zircon-producing layers (with survey LA-ICP-MS dates selectively resampled for CA-ID-TIMS U-Pb ages ranging in age from at least 210 to 241 Ma), which together with their magnetic polarity stratigraphy demonstrate that a globally exportable timescale can be produced from these continental sequences and in the process show that a prominent gap in the calibrated Phanerozoic record can be filled. The portion of core CPCP-PFNP13-1A for which the polarity stratigraphy has been completed thus far spans similar to 215 to 209Ma of the Late Triassic age, and strongly validates the longer Newark-Hartford Astrochronostratigraphic-calibrated magnetic Polarity Time-Scale (APTS) based on cores recovered in the 1990s during the Newark Basin Coring Project (NBCP). Core recovery was similar to 100% in all holes (Table 1). The coreholes were inclined similar to 60-75 degrees approximately to the south to ensure azimuthal orientation in the nearly flat-lying bedding, critical to the interpretation of paleomagentic polarity stratigraphy. The two longest of the cores (CPCP-PFNP13-1A and 2B) were CT-scanned in their entirety at the University of Texas High Resolution X-ray CT Facility in Austin, TX, and subsequently along with 2A, all cores were split and processed at the CSDCO/LacCore Facility, in Minneapolis, MN, where they were scanned for physical property logs and imaging. While remaining the property of the Federal Government, the archive half of each core is curated at the NSF-sponsored LacCore Core Repository and the working half is stored at the Rutgers University Core Repository in Piscataway, NJ, where the initial sampling party was held in 2015 with several additional sampling events following. Additional planned study will recover the rest of the polarity stratigraphy of the cores as additional zircon ages, sedimentary structure and paleosol facies analysis, stable isotope geochemistry, and calibrated XRF core scanning are accomplished. Together with strategic outcrop studies in Petrified Forest National Park and environs, these cores will allow the vast amount of surface paleontological and paleoenvironmental information recorded in the continental Triassic of western North America to be confidently placed in a secure context along with important events such as the giant Manicouagan impact at similar to 215.5 Ma (Ramezani et al., 2005) and long wavelength astronomical cycles pacing global environmental change and trends in atmospheric gas composition during the dawn of the dinosaurs.
    • Collective Effects in Casimir-Polder Forces

      Sinha, Kanupriya; Venkatesh, B. Prasanna; Meystre, Pierre; Univ Arizona, Dept Phys; Univ Arizona, Coll Opt Sci (AMER PHYSICAL SOC, 2018-11-01)
      We study cooperative phenomena in the fluctuation-induced forces between a surface and a system of neutral two-level quantum emitters prepared in a coherent collective state, showing that the total Casimir-Polder force on the emitters can be modified via their mutual correlations. Particularly, we find that a one-dimensional chain of emitters prepared in a super-or subradiant state experiences an enhanced or suppressed collective vacuum-induced force, respectively. The collective nature of dispersion forces can be understood as resulting from the interference between the different processes contributing to the surface-modified resonant dipole-dipole interaction. Such cooperative fluctuation forces depend singularly on the surface response at the resonance frequency of the emitters, thus being easily maneuverable. Our results demonstrate the potential of collective phenomena as a new tool to selectively tailor vacuum forces.
    • Role of Ocean Model Formulation in Climate Response Uncertainty

      Krasting, John P.; Stouffer, Ronald J.; Griffies, Stephen M.; Hallberg, Robert W.; Malyshev, Sergey L.; Samuels, Bonita L.; Sentman, Lori T.; Univ Arizona, Dept Geosci (AMER METEOROLOGICAL SOC, 2018-11)
      Oceanic heat uptake (OHU) is a significant source of uncertainty in both the transient and equilibrium responses to increasing the planetary radiative forcing. OHU differs among climate models and is related in part to their representation of vertical and lateral mixing. This study examines the role of ocean model formulation-specifically the choice of the vertical coordinate and the strength of the background diapycnal diffusivity K-d-in the millennial-scale near-equilibrium climate response to a quadrupling of atmospheric CO2. Using two fully coupled Earth system models (ESMs) with nearly identical atmosphere, land, sea ice, and biogeochemical components, it is possible to independently configure their ocean model components with different formulations and produce similar near-equilibrium climate responses. The SST responses are similar between the two models (r(2) = 0.75, global average similar to 4.3 degrees C) despite their initial preindustrial climate mean states differing by 0.4 degrees C globally. The surface and interior responses of temperature and salinity are also similar between the two models. However, the Atlantic meridional overturning circulation (AMOC) responses are different between the two models, and the associated differences in ventilation and deep-water formation have an impact on the accumulation of dissolved inorganic carbon in the ocean interior. A parameter sensitivity analysis demonstrates that increasing the amount of K-d produces very different near-equilibrium climate responses within a given model. These results suggest that the impact of the ocean vertical coordinate on the climate response is small relative to the representation of subgrid-scale mixing.
    • Regional drought shifts (1710–2010) in East Central Asia and linkages with atmospheric circulation recorded in tree-ring δ18O

      Xu, Guobao; Liu, Xiaohong; Trouet, Valerie; Treydte, Kerstin; Wu, Guoju; Chen, Tuo; Sun, Weizhen; An, Wenling; Wang, Wenzhi; Zeng, Xiaomin; Qin, Dahe; Univ Arizona, Lab Tree Ring Res (SPRINGER, 2019-01)
      Drought occurrence and duration in central Asia are of important socioeconomic, ecological, and geophysical significance and have received increasing research attention in recent years. Understanding long-term drought trends and their driving forces require reliable records of past drought variability with broad spatial representativeness. Here, we compiled four tree-ring O-18 records from eastern central Asia (ECA) and composited them into a drought-sensitive proxy to explore regional ECA moisture variations over the past 301years (1710-2010 CE). A robust regional standardized precipitation-evapotranspiration index (SPEI) reconstruction was established based on the tree-ring cellulose O-18 fractionation mechanism and statistically significant proxy-climate relationships. We identified prominent droughts in 1710-1770, 1810-1830, and the beginning of the twenty-first century, and a regime shift to a persistently wet period from the 1880s to 2000. Our reconstruction reveals the impact of drought and pluvial patterns on the decline of Zhungar Empire, and on historical agricultural and socio-economical activities, including increased migration into ECA during the 1770-1800 pluvial. Our findings also suggest that wet conditions in the twentieth century in ECA were related to a strengthening of the westerly circulation and thus shed light on large-scale atmospheric circulation dynamics in central Asia.
    • Key Factors in Clinical Competency Committee Members' Decisions Regarding Residents' Readiness to Serve as Supervisors: A National Study

      Schumacher, Daniel J; Martini, Abigail; Bartlett, Kathleen W; King, Beth; Calaman, Sharon; Garfunkel, Lynn C; Elliott, Sean P; Frohna, John G; Schwartz, Alan; Michelson, Catherine D; Univ Arizona, Coll Med; Univ Arizona, Coll Med, Phoenix Childrens Hosp (LIPPINCOTT WILLIAMS & WILKINS, 2019-02-01)
      Entrustment has become a popular assessment framework in recent years. Most research in this area has focused on how frontline assessors determine when a learner can be entrusted. However, less work has focused on how these entrustment decisions are made. The authors sought to understand the key factors that pediatric residency program clinical competency committee (CCC) members consider when recommending residents to a supervisory role. CCC members at 14 pediatric residency programs recommended residents to one of five progressive supervisory roles (from not serving as a supervisory resident to serving as a supervisory resident in all settings). They then responded to a free-text prompt, describing the key factors that led them to that decision. The authors analyzed these responses, by role recommendation, using a thematic analysis. Of the 155 CCC members at the participating programs, 84 completed 769 supervisory role recommendations during the 2015-2016 academic year. Four themes emerged from the thematic analysis: (1) Determining supervisory ability follows from demonstrated trustworthiness; (2) demonstrated performance matters, but so does experience; (3) ability to lead a team is considered; and (4) contextual considerations external to the resident are at play. CCC members considered resident and environmental factors in their summative entrustment decision making. The interplay between these factors should be considered as CCC processes are optimized and studied further.
    • Milestone Ratings and Supervisory Role Categorizations Swim Together, but Is the Water Muddy?

      Schumacher, Daniel J; Bartlett, Kathleen W; Elliott, Sean P; Michelson, Catherine; Sharma, Tanvi; Garfunkel, Lynn C; King, Beth; Schwartz, Alan; Univ Arizona, Dept Pediat; Univ Arizona, Phoenix Childrens Hosp, Dept Pediat (ELSEVIER SCIENCE INC, 2019-03-01)
      This single-specialty, multi-institutional study aimed to determine 1) the association between milestone ratings for individual competencies and average milestone ratings (AMRs) and 2) the association between AMRs and recommended supervisory role categorizations made by individual clinical competency committee (CCC) members. METHODS: During the 2015-16 academic year, CCC members at 14 pediatric residencies reported milestone ratings for 21 competencies and recommended supervisory role categories (may not supervise, may supervise in some settings, may supervise in all settings) for residents they reviewed. An exploratory factor analysis of competencies was conducted. The associations among individual competencies, the AMR, and supervisory role categorizations were determined by computing bivariate correlations. The relationship between AMRs and recommended supervisory role categorizations was examined using an ordinal mixed logistic regression model. RESULTS: Of the 155 CCC members, 68 completed both milestone assignments and supervision categorizations for 451 resi- dents. Factor analysis of individual competencies controlling for clustering of residents in raters and sites resulted in a single -factor solution (cumulative variance: 0.75). All individual competencies had large positive correlations with the AMR (correlation coefficient: 0.84-0.93), except for two professionalism competencies (Profl : 0.63 and Prof4: 0.65). When combined across training year and time points, the AMR and supervisory role categorization had a moderately positive correlation (0.56). CONCLUSIONS: This exploratory study identified a modest correlation between average milestone ratings and supervisory role categorization. Convergence of competencies on a single factor deserves further exploration, with possible rater effects warranting attention.
    • Participatory Democracy, Pluralism, and the Rational Model in Natural Resource Planning: A Case Study of the San Pedro River Initiative Process, Arizona, U.S.A.

      Evans, Luke T. (The University of Arizona., 2002)
      An analysis and critique is conducted of pluralism, the rational model, and participatory democracy in relation to public participation in natural resource planning and policy development. Each theory is evaluated in terms of efficacy, representation and access, information exchange and learning, continuity of participation, and decision-making authority. A case study is used to assess elements of each theory in an actual public participation process, utilizing the above criteria. The study indicates that the need for efficiency precludes the use of practices that would more thoroughly involve the public in decision making processes, and that policy making tends to revert to more traditional, expert-dominated, and exclusive public processes despite efforts to the contrary. Finally, the analysis questions the utility of comprehensive public involvement in natural resource policy making and planning given the constraints of existing legal mandates, polarized public opinions, and the need for decisions made in the larger public interest.
    • Visible and Near-infrared Laboratory Demonstration of a Simplified Pyramid Wavefront Sensor

      Lozi, Julien; Jovanovic, Nemanja; Guyon, Olivier; Chun, Mark; Jacobson, Shane; Goebel, Sean; Martinache, Frantz; Univ Arizona, Coll Opt Sci (IOP PUBLISHING LTD, 2019-04)
      Wavefront sensing and control are important for enabling one of the key advantages of using large apertures, namely higher angular resolution. Pyramid wavefront sensors are becoming commonplace in new instrument designs owing to their superior sensitivity. However, one remaining roadblock to their widespread use is the fabrication of the pyramidal optic. This complex optic is challenging to fabricate due to the pyramid tip, where four planes need to intersect at a single point. Thus far, only a handful of these have been produced due to the low yields and long lead times. To address this, we present an alternative implementation of the pyramid wavefront sensor which relies instead on two roof prisms. Such prisms are easy and inexpensive to source. We demonstrate the successful operation of the roof prism pyramid wavefront sensor on an 8 m class telescope, at visible and near-infrared wavelengths, for the first time using a SAPHIRA HgCdTe detector without modulation for a laboratory demonstration, and elucidate how this sensor can be used more widely on wavefront control test benches and instruments.
    • Standing Wave Considerations in the Link Model of 60 GHz Directional Surface Wave Arrays

      Baniya, Prabhat; Melde, Kathleen; Department of Electrical and Computer Engineering, University of Arizona (IEEE, 2018-07)
      This paper proposes an improvement of the link model of 60 GHz directional surface wave antenna arrays. Since the transmit and receive arrays share the grounded substrate, the total coupling power is contained in both space and surface waves. The dominant TM0 mode of the grounded substrate contributes to the surface wave coupling. In addition, it is shown that the finite extent of the substrate creates a TM0 standing wave. This wave is responsible for oscillations in the power coupling between the arrays as a function of their separation.
    • Switched-Beam Endfire Planar Array With Integrated 2-D Butler Matrix for 60 GHz Chip-to-Chip Space-Surface Wave Communications

      Baniya, Prabhat; Melde, Kathleen; Department of Electrical and Computer Engineering, University of Arizona (IEEE, 2019-02-01)
      A 2-D Butler matrix feed network is designed, implemented, and integrated with a 60-GHz 2 × 2 circular patch planar array for chip-to-chip communications. The realized antenna module is a thin multilayer microstrip structure with a footprint small enough to fit over a typical multicore chip. The network enables end-fire (azimuthal) scan of the array main beam in the four diagonal directions, which is demonstrated for the first time here. The antenna module provides a seamless and practical way to achieve reconfigurable interchip communication in multicore multichip (MCMC) systems. A hybrid space-surface wave interconnect is proposed that takes advantage of surface wave coupling. The matrix is a four input, four output i.e., 4 × 4 network consisting of four interconnected quadrature (90°) hybrid couplers. A multi-antenna module (MAM) consisting of five antenna modules that emulates diagonal interchip communication in MCMC systems is fabricated. The simulation and measurement of transmission coefficients between the antenna modules on the MAM are performed and compared.
    • Obsessively Writing the Modern City: The Partial Madness of Urban Planning Culture and the Case of Arturo Soria y Mata in Madrid, Spain

      Fraser, Benjamin; Univ Arizona, Dept Spanish & Portuguese, Coll Humanities (Liverpool University Press (UK), 2019)
      The article blends disability studies and urban cultural studies in order to explore the geometrical obsessions of modern urban planners. It sets the stage by including the figure of the urban planner in the list of specialists (artists, scientists, writers) at the core of the argument made by Lennard J. Davis in Obsession: A History (2008). One planner in particular typifies the way in which obsessive thinking comes to be prized and somewhat normalized during the eighteenth and nineteenth centuries. Arturo Soria y Mata’s plan for a Linear City follows the renowned examples of Baron Georges von Haussmann’s Paris and Ildefons Cerdà’s Barcelona. Soria y Mata’s plan for Madrid touts the triumph of conceptual space through bold geometrical vectors that effectively erase the variations of urban life in both symbolic and practical terms. An urban cultural studies framework, grounded in the urban thinking of Henri Lefebvre and others, extends the notion of culture beyond literary approaches and effectively urbanizes global disability studies. It also draws attention to modern urban planning’s paradoxical reliance on both ableist ideology and cognitive difference, framed by the concept of “partial madness.”
    • Miguel Brieva, quincemayista: Art, Politics and Comics Form in the 15-M Graphic Novel Lo que (me) está pasando (2015)

      Fraser, Benjamin; Univ Arizona, Dept Spanish & Portuguese, Coll Humanities (eScholarship, 2018)
      Como una contribución a la tradición quincemayista de España y a la primera novela gráfica del artista, la publicación de Lo que (me) está pasando (2015) por Miguel Brieva (1974, Sevilla) requiere un análisis dual. La obra es una meditación autoconsciente que comenta la tradición artística del propio autor a la vez que explora el papel de la cultura del cómic pos-15-M en la crítica política y espacial actual. Aquí Brieva continúa el compromiso social de producción cultural anterior y enfatiza más concretamente el potencial de modos de crítica colectivos frente a la enajenación y la colonización del espacio llevados a cabo por el capitalismo contemporáneo. / As a contribution to the quincemayista tradition in Spain and the artist’s first graphic novel, the publication of Lo que (me) está pasando (2015) by Miguel Brieva (1974, Sevilla) prompts a dual analysis. The work is a self-conscious meditation that comments on the artist’s own artistic tradition at the same time that it explores the role of post-15-M comics culture in the political and spatial critique of the present moment. Here Brieva continues the social commitment of his previous cultural production and emphasizes more concretely the potential of collective modes of critique in confronting the alienation and the colonization of space carried out by contemporary capitalism.