Search results for: Steven J. Weiss

Items from 1 to 20 out of 60 results

article

The rare and enigmatic mayfly Prosopistoma pennigerum (Müller, 1785): Habitat characteristics, recent records from the Volga (Russia) and Vjosa (Albania) rivers, and a proposal for flagship species status

Martin Schletterer, Steven J. Weiss, Vyacheslav V. Kuzovlev, Simon Vitecek, more

Aquatic Conservation: Marine and Freshwater Ecosystems > 31 > 12 > 3636 - 3643

Nymphs of all 29 described Prosopistoma species share a conspicuous synapomorphy: a round mesonotal shield, the carapace. They occur in the Palaearctic (nine species), the Oriental (12 species) and the Afrotropic as well as Australian regions (six and two species, respectively). Relatively little is known about their ecology, but past and extant distribution patterns indicate an association with...

article

Reference databases, primer choice, and assay sensitivity for environmental metabarcoding: Lessons learnt from a re‐evaluation of an eDNA fish assessment in the Volga headwaters

Tamara Schenekar, Martin Schletterer, Laurène A. Lecaudey, Steven J. Weiss

River Research and Applications > 36 > 7 > 1004 - 1013

Biodiversity monitoring via environmental DNA, particularly metabarcoding, is evolving into a powerful assessment tool for riverine systems. However, for metabarcoding to be fully integrated into standardized monitoring programmes, some current challenges concerning sampling design, laboratory workflow, and data analysis need to be overcome. Here, we review some of these major challenges and potential...

article

Fish diversity assessment in the headwaters of the Volga River using environmental DNA metabarcoding

Laurène A. Lecaudey, Martin Schletterer, Vyacheslav V. Kuzovlev, Christoph Hahn, more

Aquatic Conservation: Marine and Freshwater Ecosystems > 29 > 10 > 1785 - 1800

The headwaters of the Volga River exhibit large reaches with near‐pristine conditions, and therefore long‐term biodiversity monitoring of this catchment can provide rare and valuable information on a European lowland river. More specifically, freshwater fish species assemblages are a good indicator of ecosystem status, as they are particularly sensitive to environmental changes and hydromorphological...

chapter

Wide-band high permeability metamaterials

Quang Nguyen, Amir I. Zaghloul, Steven J. Weiss

2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting > 1963 - 1964

2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting

New possibilities to design a wide-band high permeability metamaterials are considered in this paper. A metamaterial formed by stacking multi-layered square loops with small incremental variations in dimensions between layers is presented. By doing that, we create multi-resonant response of metamaterials which can achieve high permeability over a wide frequency range. It is shown that the proposed...

chapter

Simulations and measurements of large phase progression in multi-layered metamaterials

Amir I. Zaghloul, Steven J. Weiss, Theodore K. Anthony

2016 URSI International Symposium on Electromagnetic Theory (EMTS) > 611 - 613

2016 URSI International Symposium on Electromagnetic Theory (EMTS)

Insertion phase in multi-layered metamaterials play an important role in understanding the constitutive parameters of the material. Simulations and measurements show the distinct large phase change across the frequency band in which the metamaterial exhibits special parameters. This paper addresses the phase behavior for materials that use loops or rings for magnetic properties and rods, wires, or...

chapter

Edge slot waveguide array antenna for an omnidirectional radar system

Steven D. Keller, Steven J. Weiss, Bryan T. Farley

2016 IEEE International Symposium on Antennas and Propagation (APSURSI) > 1461 - 1462

2016 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting

An edge-slot waveguide array antenna is proposed to serve as the receive antenna in an omnidirectional radar system. The general design process for the antenna is described and the antenna is modeled in Ansoft HFSS and EMSS FEKO. Results from these simulations are compared with prototype measurements to characterize the antenna. The results indicate an S₁₁ < −10 dB bandwidth of 6.5%, half-power...

article

Impact of an emergency medicine pharmacist on antibiotic dosing adjustment

Kyle M. DeWitt, Steven J. Weiss, Shannon Rankin, Amy Ernst, more

The American Journal of Emergency Medicine > 2016 > 34 > 6 > 980-984

Overall medication-related errors in the emergency department (ED) are 13.5 times more likely to occur in the absence of an emergency medicine pharmacist (EMP). Although the effectiveness of pharmacist-driven renal dosing adjustment has been studied in the intensive care unit, data are lacking in the ED setting. The aim of our study was to evaluate the appropriateness of antibiotic dosing when an...

article

Randomized single-blinded clinical trial on effects of nursery songs for infants and young children's anxiety before and during head computed tomography

Grace Park, Steven J. Weiss, Patricia Repar

The American Journal of Emergency Medicine > 2016 > 34 > 3 > 663

article

The meaning of elevated troponin I levels: not always acute coronary syndromes

Bryan Harvell, Nathan Henrie, Amy A. Ernst, Steven J. Weiss, more

The American Journal of Emergency Medicine > 2016 > 34 > 2 > 145-148

Troponin elevation can be caused by etiologies other than acute coronary syndromes (ACS). Our hypothesis was that elevated troponins occur more frequently in non-ACS cases but that ACS cases (type 1 ST-elevation myocardial infarction [STEMI] and type 1 non-STEMI [NSTEMI]) have significantly higher troponin elevations.This was a cross-sectional cohort analysis of a random subset of all patients with...

article

Randomized single-blinded clinical trial on effects of nursery songs for infants and young children’s anxiety before and during head computed tomography

Grace Park, Steven J. Weiss, Patricia Repar

American Journal of Emergency Medicine > 2015 > 33 > 10 > 1477-1482

The objective of this clinical trial was to determine if an intervention of listening to nursery songs with integrated heartbeat sounds resulted in changes in anxiety levels in infants and children younger than 4 years in an emergent setting.This is a randomized single-blinded controlled trial. The study included 62 children younger than 4 years who were deemed by the emergency physician to need a...

chapter

Arrays of 1-dimensional antennas

Steven J. Weiss, Walter K. Kahn

2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting > 649 - 650

2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting

Radiation, reception and scattering by 1-dimensional antennas was described recently. As receiver, such an antenna with resistive load faithfully models a thin resistive sheet. Arrays of two 1-dimensional antennas with various excitations and loads are considered as radiating antennas and receiving antennas. Results include directivity, element efficiency, received and scattered power.

chapter

Quadrifilar helix antenna for enhanced air-to-ground communications

Steven D. Keller, Steven J. Weiss

2015 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium) > 336

2015 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)

Communications systems for air-to-ground channels and airborne ground-to-ground relays are often hindered by polarization losses between the airborne antenna and the terrestrial antenna. For man-personal terrestrial communications via a handheld radio, the linear (vertical) polarized whip or flexible stub antenna is traditionally used for its simplicity, ruggedness and size. For airborne platforms...

article

Ultra-Thin UHF Broadband Antenna on a Non-Uniform Aperiodic (NUA) MetaSurface

Nowrin Chamok, Mohammod Ali, Theodore Anthony, Steven J. Weiss

IEEE Antennas and Propagation Magazine > 2015 > 57 > 2 > 167 - 180

ï»¿A new concept to design ultrathin directional broadband antennas using a nonuniform aperiodic metasurface is introduced. The study and design of the NUA metasurface show that, by employing a decreasing taper for both the metasurface patch and their interelement spacing, broad impedance and pattern bandwidths can be attained. Experimental results show that, with a total thickness of 0.04 of the...

article

A program to improve health among prehospital providers

Scott Oglesbee, David Riss, Amy A. Ernst, Steven J. Weiss, more

American Journal of Emergency Medicine > 2015 > 33 > 4 > 590-592

article

Evaluating community ED crowding: the Community ED Overcrowding Scale study

Steven J. Weiss, Debby B. Rogers, Frank Maas, Amy A. Ernst, more

American Journal of Emergency Medicine > 2014 > 32 > 11 > 1357-1363

The goals of this study were to (1) identify valid variables that correlate with emergency department (ED) crowding and (2) determine a model that could be used to accurately reflect the degree of ED crowding.A site sampling form was applied to convenience sampling of 13 community hospitals in California between April 6, 2011, and May 1, 2011. The outcome variable was average perception of crowding...

chapter

Measurement of resonant antennas structures formed with canonical spherical contours residing over conducting spheres and hemispheres

Steven J. Weiss, Gregory Mitchell

2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium) > 32

2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)

In this work, we present measured and simulated data for a family of antennas formed with conducting canonical spherical contours residing over conducting spheres and hemispheres. The antennas are probe-fed, similar in spirit to probefed patch antennas, as well as differentially fed using probe feeds. The physical construction for the feed to these antennas is accomplished using copper SMA cables...

chapter

Measured bandwidth of resonant patch antennas supported by a conducting sphere with comparisons to Chu's limit

Steven J. Weiss, Amang Boliong

2014 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM) > 1

2014 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)

In this work, we discuss the measurement process and construction of a unique antenna having a spherical shape. Measured data are then presented from which the antenna's bandwidth can be determined. The antenna(s) are patch antennas with canonical spherical shapes supported by and underlying conducting sphere, Figure 1a. The unique nature of the feed precludes stored energy from existing inside the...

chapter

Evaluation of the Sommerfeld integral for a dipole over a layered earth model

James P. Conroy, Steven J. Weiss

2013 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium) > 15

2013 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)

This paper revisits the classic Sommerfeld integral problem of determining the fields radiated from a dipole placed over a half-space. The approach to solving this problem has a wide range of applications from microstrip antenna design to VLF radio wave propagation. Analytic expressions are derived to determine the field solutions for a set of geologic cases by asymptotically evaluating the spectral...

chapter

Simulation and measurement of low-profile antennas realized with isotropic and anisotropic magneto-dielectrics

Steven J. Weiss

2013 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium) > 20

2013 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)

The use of magneto-dielectrics is becoming increasingly popular in the development of low-profile antennas. Some of these materials are realized by using the rule of mixtures while others are more closely associated with the types of unit cells related to metamaterials. These magneto-dielectrics can be isotropic or anisotropic broadening the complexity and flexibility of potential antenna designs...

chapter

Performance of spiral antenna over broadband uniform-height progressive EBG surface

Sandeep Palreddy, Amir I. Zaghloul, Steven J. Weiss

2013 7th European Conference on Antennas and Propagation (EuCAP) > 3941 - 3944

2013 7th European Conference on Antennas and Propagation (EuCAP)

This paper presents the performance of a spiral antenna over an electromagnetic band-gap (EBG) surface that is designed to operate over a broadband that matches the bandwidth of the spiral antenna. The broadband EBG uses unit cells arranged in a concentric pattern with progressively increasing dimensions that correspond to the decreasing frequencies of the spiral antenna regions. The EBG cells are...

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ANTENNA MEASUREMENTS (3)
BANDWIDTH (3)
DIPOLE ANTENNAS (3)
METAMATERIALS (3)
ANTENNA ARRAYS (2)
BROADBAND ANTENNAS (2)
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ARMOR (1)
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BLOOD UREA NITROGEN (1)
BOOKKEEPING METHOD (1)
BOUNDARY CONDITIONS (1)
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CARDIOVASCULAR CHANGES (1)
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CHEST PAIN (1)
CONFORMAL ANTENNA (1)
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COST-MINIMIZATION ANALYSIS (1)
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ELECTROMAGNETIC FIELDS (1)
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ENERGY STORAGE (1)
EUROPE (1)
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FISH (1)
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KEY WORDSEMS, MOTOR VEHICLE CRASHES, INJURY PREVENTION, PREHOSPITAL, AMBULANCE (1)
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LOW-TEMPERATURE CO-FIRED CERAMIC (LTCC) FABRICATION (1)
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MEDICINE IN ART (1)
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INFONA - science communication portal

Search results for: Steven J. Weiss

The rare and enigmatic mayfly Prosopistoma pennigerum (Müller, 1785): Habitat characteristics, recent records from the Volga (Russia) and Vjosa (Albania) rivers, and a proposal for flagship species status

Reference databases, primer choice, and assay sensitivity for environmental metabarcoding: Lessons learnt from a re‐evaluation of an eDNA fish assessment in the Volga headwaters

Fish diversity assessment in the headwaters of the Volga River using environmental DNA metabarcoding

Wide-band high permeability metamaterials

Simulations and measurements of large phase progression in multi-layered metamaterials

Edge slot waveguide array antenna for an omnidirectional radar system

Impact of an emergency medicine pharmacist on antibiotic dosing adjustment

Randomized single-blinded clinical trial on effects of nursery songs for infants and young children's anxiety before and during head computed tomography

The meaning of elevated troponin I levels: not always acute coronary syndromes

Randomized single-blinded clinical trial on effects of nursery songs for infants and young children’s anxiety before and during head computed tomography

Arrays of 1-dimensional antennas

Quadrifilar helix antenna for enhanced air-to-ground communications

Ultra-Thin UHF Broadband Antenna on a Non-Uniform Aperiodic (NUA) MetaSurface

A program to improve health among prehospital providers

Evaluating community ED crowding: the Community ED Overcrowding Scale study

Measurement of resonant antennas structures formed with canonical spherical contours residing over conducting spheres and hemispheres

Measured bandwidth of resonant patch antennas supported by a conducting sphere with comparisons to Chu's limit

Evaluation of the Sommerfeld integral for a dipole over a layered earth model

Simulation and measurement of low-profile antennas realized with isotropic and anisotropic magneto-dielectrics

Performance of spiral antenna over broadband uniform-height progressive EBG surface

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