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4 results

  • Design and analysis of circular microstrip patch probe array for precise specific absorption rate measurement at quad-band

  • Bhukya Venkanna Naik
  • Journal:
    International Journal of Microwave and Wireless Technologies / Volume 15 / Issue 1 / February 2023
    Published online by Cambridge University Press:
    07 February 2022, pp. 120-128
    • Article
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  • This paper distinguishes the design and analysis of 3 × 2 circular microstrip patch probe array for specific absorption rate (SAR) measurement at quad-band. This novel approach consists of FR4 substrate radial dimension of 88 mm and it has six circular array elements with a radius of 17 mm; out of these six elements, three array elements are having rectangular slots with dimensions of 1.8 × 1.5 × 1.5 mm3. The array elements are coupled with six probes which have a dimension of 100 mm with a 2.5 mm tip radius; these six probes are embedded into a tissue-equivalent liquid-filled human head mannequin. In this mannequin, instantaneous SAR at any six positions has been investigated. The proposed design resonates at 1.8, 2.1, 2.4, and 2.5 GHz with a return loss of −11.53, −15.90, −15.73, and −25.49 dB. The circular microstrip probe array is fed by a 50 Ohm coaxial feed. In addition, the 3D human head model analysis is also presented. The precisely estimated SAR values are 0.135, 0.108, 0.167, and 0.244 W/kg at 1 g of tissue. For the traceable measurements, each source of uncertainty budget has been estimated.

  • Chapter 13 - Surrealist Display Practices

  • from Part II - Developments: Practices/Cultures/Material Forms
  • Edited by Natalya Lusty, University of Melbourne
  • Book:
    Surrealism
    Published online:
    23 July 2021
    Print publication:
    12 August 2021, pp 240-256

  • Summary

    This chapter examines Surrealist curatorial practice from its emergence in the 1920s until the last group exhibition prior to André Breton’s death in 1966. Rooted in the agitational French and German Dada demonstrations that immediately preceded them, Surrealist exhibitions aimed to transform their viewers through an evolving set of tactics that diverged markedly from normative gallery display practices. The chapter proposes that by recourse initially to the discursive, then to the tactile, and finally through fully immersive environments, these complex and often elaborate installations aimed to cultivate sensual, politicized, and postnational subjects. Eschewing those detached models of modernism that aimed either to privilege abstraction or to maintain medium specificity, the exhibitions curated by the Surrealists over half a century give shape to a coherent curatorial practice that engaged with some of the hallmark discourses and experiences of the twentieth century.

  • The Impact of Backboard Placement on Chest Compression Quality: A Mannequin Study

  • Erkman Sanri, Sinan Karacabey
  • Journal:
    Prehospital and Disaster Medicine / Volume 34 / Issue 2 / April 2019
    Published online by Cambridge University Press:
    14 April 2019, pp. 182-187
    Print publication:
    April 2019
  • Introduction:

    High-quality chest compressions (CCs) are associated with high survival rates and good neurological outcomes in cardiac arrest patients. The 2015 American Heart Association (AHA; Dallas, Texas USA) Guidelines for Resuscitation defined and recommended high-quality CCs during cardiopulmonary resuscitation (CPR). However, CPR providers struggle to achieve high-quality CCs. There is a debate about the use of backboards during CPR in literature. Some studies suggest backboards improve CC quality, whereas others suggest that backboards can cause delays. This is the first study to evaluate all three components of high-quality CCs: compression depth, recoil depth, and rate, at the same time with a high number of subjects. This study evaluated the impact of backboards on CC quality during CPR. The primary outcome was the difference in successful CC rates between two groups.

    Methods:

    This was a randomized, controlled, single-blinded study using a high-fidelity mannequin. The successful CC rates, means CC depths, recoil depths, and rates achieved by 6th-grade undergraduate medical students during two minutes of CPR were compared between two randomized groups: an experimental group (backboard present) and a control group (no backboard).

    Results:

    Fifty-one of all 101 subjects (50.5%) were female, and the mean age was 23.9 (SD = 1.01) years. The number and the proportion of successful CCs were significantly higher in the experimental group (34; 66.7%) when compared to the control group (19; 38.0%; P = .0041). The difference in mean values of CC depth, recoil depth, and CC rate was significantly higher in the experiment group.

    Conclusion:

    The results suggest that using a backboard during CPR improves the quality of CCs in accordance with the 2015 AHA Guidelines.

    Sanri E, Karacabey S. The impact of backboard placement on chest compression quality: a mannequin study. Prehosp Disaster Med. 2019;34(2):182–187

  • Can Correct Closed-Chest Compressions Be Performed During Prehospital Transport?

  • C. Keith Stone, Stephen H. Thomas
  • Journal:
    Prehospital and Disaster Medicine / Volume 10 / Issue 2 / June 1995
    Published online by Cambridge University Press:
    28 June 2012, pp. 121-123
    Print publication:
    June 1995
  • Introduction:

    The resuscitation rate from out-of-hospital cardiac arrest is low. There are many factors to be considered as contributing to this phenomenon. One factor not previously considered is the impact of a moving ambulance environment on the ability to perform closed-chest compressions.

    Hypothesis:

    Proper closed-chest compressions can be performed in a moving ambulance.

    Methods:

    A cardiopulmonary resuscitation (CPR) training mannequin with an attached skill meter (Skillmeter ResusciAnnie®, Laerdal, Armonk, N. Y., USA) that measures each chest compression for proper depth and hand placement was used. Ten emergency medical technician-basic (EMT-B) certified prehospital providers were assigned into one of five teams. Each team performed a total of four sessions of five minutes of continuous closed-chest compressions on the mannequin. Two sessions were done by each team: one in the control environment with the mannequin placed on the floor, and the other in the experimental environment with the mannequin placed in the back of a moving ambulance. The ambulance was operated without warning lights and siren, and all traffic rules were obeyed. The percentage of correct closed-chest compressions was recorded for each session, and the mean values were compared using Student's t-test with alpha set at 0.01 for statistical significance.

    Results:

    Ten sessions of compressions were done in both environments. The mean percentage of correct compressions was 77.6 ±15.6 for the control group and 45.6 ±18.3 for the ambulance group (p = 0.0005).

    Conclusion:

    A moving ambulance environment appears to impair the ability to perform closed-chest compressions.