Pilot Test of the Trisensor, A New Generation Sonar Sensory Aid

1983 ◽  
Vol 77 (9) ◽  
pp. 446-449 ◽  
Author(s):  
Randolph D. Easton ◽  
Richard M. Jackson
Keyword(s):  
Pilot Study ◽  
High Resolution ◽  
Object Localization ◽  
Pilot Test ◽  
Angle Error ◽  
Space Object ◽  
Near Space ◽  
Side Channels ◽  
Center Channel ◽  
New Generation

This report describes the results of a pilot study undertaken to assess systematically the usability of the Trisensor in near space, object localization tasks. In general, findings support the contention that the high resolution, center channel reduces the degree of angle error when reaching for targets in near space. It was also found that the degree of angle error associated with the binaural side channels could be reduced if targets were moved from the periphery into place during localization.

The Contribution of Intermediate-Voltage, High-Resolution Electron Microscopy In Materials Science: An Appraisal

1990 ◽  
Vol 48 (1) ◽  
pp. 478-479
Author(s):  
John L. Hutchison
Keyword(s):  
High Resolution ◽  
Materials Science ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
The Past ◽  
Resolution Electron ◽  
Extreme Sensitivity ◽  
Electron Microscopes ◽  
New Generation ◽  
Small Metal Particles

Over the past five years or so the development of a new generation of high resolution electron microscopes operating routinely in the 300-400 kilovolt range has produced a dramatic increase in resolution, to around 1.6 Å for “structure resolution” and approaching 1.2 Å for information limits. With a large number of such instruments now in operation it is timely to assess their impact in the various areas of materials science where they are now being used. Are they falling short of the early expectations? Generally, the manufacturers’ claims regarding resolution are being met, but one unexpected factor which has emerged is the extreme sensitivity of these instruments to both floor-borne and acoustic vibrations. Successful measures to counteract these disturbances may require the use of special anti-vibration blocks, or even simple oil-filled dampers together with springs, with heavy curtaining around the microscope room to reduce noise levels. In assessing performance levels, optical diffraction analysis is becoming the accepted method, with rotational averaging useful for obtaining a good measure of information limits. It is worth noting here that microscope alignment becomes very critical for the highest resolution.In attempting an appraisal of the contributions of intermediate voltage HREMs to materials science we will outline a few of the areas where they are most widely used. These include semiconductors, oxides, and small metal particles, in addition to metals and minerals.

Abstract WP21: Primary Thrombectomy Within 3 Hours of Onset in Acute Ischemic Stroke From Large Artery Occlusion (PAST3-LAO)- A Pilot Study

Stroke ◽  
2016 ◽  
Vol 47 (suppl_1) ◽  
Author(s):  
Yahia M Lodi ◽  
Varun Reddy ◽  
George Petro ◽  
Anas Hourani ◽  
Chun-An Chou
Keyword(s):  
Pilot Study ◽  
Artery Occlusion ◽  
Primary Objective ◽  
Stent Retriever ◽  
Large Artery ◽  
Good Outcome ◽  
Randomized Controlled ◽  
Randomized Controlled Studies ◽  
New Generation ◽  
Number Of Passes

Background: Based on recent trials, AIS due to large artery occlusion (LAO) is resistant to IV thrombolysis and adjunctive stent retriever thrombectomy (SRT) is associated with better recanalization rates and outcomes.Despite the benefit with endovascular therapy 39% to 68% of patients were either disabled or dead.Thrombectomy in AIS with LAO within 3 hours (IV t-PA window) is performed as secondary therapy after IV thrombolysis, which may be associated with delay in enrollment and recanalization. Objective: Primary objective is to evaluate the safety, feasibility and recanalization rate of primary SRT (without IV tPA) within 3 hours in AIS with NIHSS >10 from LAO.Secondary objective is to determine the functional outcome in 30-days and 90-days. Methods: Based on institutionally approved protocol patients with LAO with LCB within 3 hours were offered primary SRT alone as an alternative to IV rtPA, after informed consent.Consecutive patients who underwent primary SRT for LAO within 3 hours from 2012 to 2014 were enrolled.Outcomes were measured using modified Rankin Scale. Results: 18 patients with LAO; mean age 62.8±15.3 years and mean NIHSS 16±5; chose primary SRT after informed consent.Thrombectomy was performed using new generation stent-retriever device in addition to small intra-arterial rtPA (2-10 mg).Number of passes was 1.6±0.9.Near complete (TICI2b in 1) and complete (TICI3 in 17) recanalization was observed in all (100%) patients.Mean time to recanalization from symptoms onset was 188.5±82.7 and from groin puncture was 64.61±40.14 minutes.Immediate post-thrombectomy, 24 hour and 30 day NIHSS score was 4.4±3.7, 1.9±3.2 and 0.3±0.9 respectively.There was no procedure related complication.Asymptomatic perfusion related hemorrhage developed in 6 patients (33%).30 days good outcome was observed in all cases (mRS0= 38.9%, mRS1=44.4%, mRS2=16.7%). 90 days good outcome was observed as follows (mRS0= 50.0%, mRS1=44.4%, mRS2=5.6%). Conclusion: Our pilot study demonstrates that primary SRT in AIS due LAO occlusion with LCB is not only safe and feasible, but associated with complete recanalization and good functional outcome.Larger randomized controlled studies are needed.

scholarly journals PILOT RESULTS OF STUDYING CARDIAC MICROPOTENTIALS IN PATIENTS WITH MYOCARDIAL INFARCTION AND CARDIOGENIC SHOCK

2019 ◽  
Vol 33 (4) ◽  
pp. 103-110 ◽  
Author(s):  
I. V. Maximov ◽  
D. K. Avdeeva ◽  
M. L. Ivanov ◽  
I. A. Zimin ◽  
M. M. Yuzhakov ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Pilot Study ◽  
High Resolution ◽  
Cardiogenic Shock ◽  
Myocardial Revascularization ◽  
Left Ventricular ◽  
National Guidelines ◽  
Software Complex ◽  
Heart Rhythm Disorders ◽  
Life Threatening

Aim. To study cardiac micropotentials registered by the hardware and software complex with nanosensors in patients with myocardial infarction for the early detection of life-threatening conditions.Materials and Methods. The pilot study included 29 patients with acute myocardial infarction who had life-threatening complications such as heart rhythm disorders, the development of acute left ventricular failure, or clinical death prehospitally or at admission to the coronary care unit. The diagnosis of myocardial infarction was established and treatment was carried out according to the national guidelines for the management of patients with myocardial infarction, including the methods of myocardial revascularization.Results. During hospitalization, eight patients developed cardiogenic shock and died. 21 patients survived and were included in the comparison group. At admission, all patients underwent high-resolution electrocardiography using the originally developed hardware and software complex with nanosensors. The micropotentials on the ST segment of the electrocardiogram were recorded for 30 s in three leads on-line. The numbers of micropotentials in the studied groups were analyzed. The analysis of the number of micropotentials within certain ranges of amplitude and duration registered on high-resolution electrocardiogram showed a decrease of the micropotential number in group of patients who died from cardiogenic shock compared with the group of survived patients.Conclusions. The results of this pilot study of cardiac micropotentials are preliminary and require further accumulation of data as well as a search for new criteria for diagnostics, prognosis, and evaluation of the treatment efficacy in patients with myocardial infarction.

scholarly journals Interferometric Observations of Mira Variables

2003 ◽  
Vol 210 ◽  
pp. 367-376
Author(s):  
G. Van Belle ◽  
R. R. Thompson ◽  
M.J. Creech-Eakman
Keyword(s):  
High Resolution ◽  
Observational Data ◽  
Atmospheric Chemistry ◽  
Spherical Symmetry ◽  
Atmospheric Dynamics ◽  
Pulsating Stars ◽  
Mira Variables ◽  
Cool Stars ◽  
Phase Lags ◽  
New Generation

Milliarcsecond resolution observations of cool stars are becoming increasingly common and sophisticated as recent advances in telescope technology mature. To varying degrees, these observations rely up on stellar models for interpretation of their data, while at the same time present particular challenges to those models. Indications of departures from spherical symmetry are beginning to be observed as increasingly rich image information is obtained by a new generation of interferometers. Examination the subtle variations of wavelength-specific sizes exhibits rich structure, connected to the atmospheric chemistry. For the pulsating stars, such as Mira variables, that structure varies with time, with the phase lags between the various sizes being connected to the atmospheric dynamics. Complex morphologies associated with atmospheric winds have been revealed with these high resolution experiments. A review of these recent results will be presented, concentrated on their implications upon stellar modelling, and the prospects for future observational data.

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