scholarly journals Coronary Embolic Phenomena: High-Impact, Low-Frequency Events

2020 ◽  
Author(s):  
Qasim Malik ◽  
Ambreen Ahmad ◽  
Stanislaw P. Stawicki ◽  
Peter Puleo
Keyword(s):  
Low Frequency ◽  
High Impact

Insight into the sediment dynamics of a high-impact low-frequency mass movement event using single-grain feldspar luminescence in the Pokhara valley, Nepal

2021 ◽  
Author(s):  
Anna-Maartje de Boer ◽  
Wolfgang Schwanghart ◽  
Jürgen Mey ◽  
Jakob Wallinga ◽  
Basanta Raj Adhikari ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Mass Movement ◽  
Low Frequency ◽  
High Impact ◽  
Osl Dating ◽  
Transport Dynamics ◽  
Infrared Stimulated Luminescence ◽  
Single Grain ◽  
Pokhara Valley ◽  
Insight Into

<p>Mass movements play an important role in landscape evolution of high mountain areas such as the Himalayas. Yet, establishing numerical age control and reconstructing transport dynamics of past events is challenging. To fill this research gap, we investigated the potential of Optically Stimulated Luminescence (OSL) dating and tracing methods. OSL dating analyses of Himalayan sediments is extremely challenging due to two main reasons: i) the OSL sensitivity of quartz, typically the mineral of choice for dating sediments younger than 100 ka, is poor, and ii) highly turbid conditions during mass movement transport hamper sufficient OSL signal resetting prior to deposition which eventually results in age overestimation. In this study, we aim to bring OSL dating to the test in an extremely challenging environment. First, we assess the applicability of single-grain feldspar dating of mass movement deposits in the Pokhara valley, Nepal. Second, we exploit the poor bleaching mechanisms to get insight into the sediment dynamics of this paleo-mass movement through bleaching proxies. The Pokhara valley is a unique setting for our case-study, considering the availability of an extensive independent radiocarbon dataset (Schwanghart et al., 2016) as a geochronological benchmark.</p><p>Single-grain infrared stimulated luminescence signals were measured at 50°C (IRSL50) and post-infrared infrared stimulated luminescence signals at 150°C (pIRIR-150). As expected, results show that the IRSL50 signal is better bleached than the pIRIR150 signal. A bootstrapped Minimum Age Model (bMAM) is applied to retrieve the youngest subpopulation to estimate the palaeodose. However, burial ages calculated based on this palaeodose overestimate the radiocarbon ages by an average factor of ~8 (IRSL50) and ~35 (pIRIR150). This shows that dating of the Pokhara Formation with our single-grain approach was not successful. Large inheritances in combination with the scatter in the single-grain dose distributions show that the sediments have been transported prior to deposition under extreme limited light exposure which corresponds well with the highly turbid nature of the sediment laden flood and debris flows that emplaced the Pokhara Formation.</p><p>To investigate the sediment transport dynamics in more detail we studied three bleaching proxies: the percentage of grains in saturation (2D0 criteria), percentage of well-bleached grains (2σ range of bMAM-De) and the overdispersion (OD). Neither of the three bleaching proxies indicate a spatial relationship with run-out distances of the mass movement deposits. We interpret this as virtual absence of bleaching during transport, which reflects the catastrophic nature of the event. While single-grain feldspar dating did not provide reliable burial ages of the Pokhara mass movement deposits, our approach has great potential to provide insight in sediment transport dynamics of high-impact low-frequency mass movement events in mountainous region.</p><p><em>References</em></p><p>Schwanghart, W., Bernhardt, A., Stolle, A., Hoelzmann, P., Adhikari, B. R., Andermann, C., ... & Korup, O. (2016). Repeated catastrophic valley infill following medieval earthquakes in the Nepal Himalaya. Science, 351(6269), 147-150.</p>

scholarly journals High Impact/Low Frequency Extreme Events: Enabling Reflection and Resilience in a Hyper-connected World

2014 ◽  
Vol 18 ◽  
pp. 772-779 ◽  
Author(s):  
Anthony J. Masys ◽  
Nibedita Ray-Bennett ◽  
Hideyuki Shiroshita ◽  
Peter Jackson
Keyword(s):  
Extreme Events ◽  
Low Frequency ◽  
High Impact

scholarly journals The Australian retirement lottery: A system failure

2016 ◽  
Vol 42 (1) ◽  
pp. 3-31 ◽  
Author(s):  
Amandha Ganegoda ◽  
John Evans
Keyword(s):  
Low Frequency ◽  
High Impact ◽  
Market Volatility ◽  
Standard Of Living ◽  
Knightian Uncertainty ◽  
System Failure ◽  
Retirement Income ◽  
Retirement System ◽  
Market Shocks ◽  
Different Levels

The purpose of this paper is to assess the adequacy of the Australian retirement system to fund the needs of retirees by taking into account both the Knightian risk arising from market volatility under normal market conditions as well as the Knightian uncertainty arising from rare but severe market shocks. We have also taken into account changes in employment during the pre-retirement phase. Given the low frequency, high impact of market shocks, the result is that cohorts of Australian retirees will enjoy very different levels of retirement income and there will be consequent shocks to the demand for the Age Pension supplement and potentially, significant variations in the standard of living in retirement for Australian employees. Whilst the Australian retirement system has been put forward as a model for other economies to follow, we find there is a fundamental flaw in the system.

scholarly journals Framework for modeling high-impact, low-frequency power grid events to support risk-informed decisions

2016 ◽  
Vol 18 ◽  
pp. 125-137 ◽  
Author(s):  
Arun Veeramany ◽  
Stephen D. Unwin ◽  
Garill A. Coles ◽  
Jeffery E. Dagle ◽  
David W. Millard ◽  
...  
Keyword(s):  
Power Grid ◽  
Low Frequency ◽  
High Impact ◽  
Informed Decisions ◽  
Low Frequency Power ◽  
Frequency Power

How to Recover from High-Impact, Low-Frequency Attacks

2018 ◽  
Vol 34 (8) ◽  
pp. 16-18
Author(s):  
Jeff Fleeman
Keyword(s):  
Low Frequency ◽  
High Impact

Clinical Supervisor Value Conflicts: Low-Frequency, but High-Impact Events

2012 ◽  
Vol 31 (2) ◽  
pp. 203-227 ◽  
Author(s):  
Patricia McCarthy Veach ◽  
Eunju Yoon ◽  
Cacy Miranda ◽  
Ian M. MacFarlane ◽  
Damla Ergun ◽  
...  
Keyword(s):  
Low Frequency ◽  
High Impact ◽  
Value Conflicts ◽  
Clinical Supervisor ◽  
Impact Events

scholarly journals Müller cyst: report of a case in pregnancy

2018 ◽  
Vol 7 (8) ◽  
pp. 3369
Author(s):  
Raúl D. Lara ◽  
Junior J. Araiza ◽  
Tecaztipocla E. López ◽  
Maria Del R. Garay ◽  
Maria I. Tolentino ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Medical Management ◽  
Preterm Labor ◽  
Surgical Intervention ◽  
Preventive Intervention ◽  
Low Frequency ◽  
Vaginal Wall ◽  
High Impact ◽  
First Time ◽  
In Pregnancy

Müller cysts are alterations in the development of sexual cords and remain as malformations associated with them. They can occur in many morphological varieties. In the case of pregnancy, vaginal tumors can complicate labor because they cause obstruc-tion of the canal. During labor, these alterations can complicate the diagnosis and proper management of pregnancy. A 22-year-old female, who came to the hospital at 30.1 weeks of gestation for the first time, due to obstetric pain, vaginal tumor was detected, the patient triggered preterm labor, which did not address medical management based on oral and intravenous uteroinhibitors, so a cesarean is decided, later in the puerperium magnetic resonance was performed finding a defect in the vaginal wall, compatible with probable Müller's cyst. Due to its low frequency but high impact on pregnancy, vaginal tumors are a diagnostic and therapeutic challenge, due to their embryological origin should be detected and advise on the consequences of them. As a result, some other alterations may coexist, which is why complementary studies are essential. In the pregnancy protocol, the proper location of the cysts guides us to a specific embryological origin, as well as a preventive intervention can be planned in cases like this. If these patients are asymptomatic, surgical intervention is not required, much less during pregnancy unless an obstetric indication for interruption is determined.

scholarly journals Trial Implementation of a Multihazard Risk Assessment Framework for High-Impact Low-Frequency Power Grid Events

2018 ◽  
Vol 12 (4) ◽  
pp. 3807-3815 ◽  
Author(s):  
Arun Veeramany ◽  
Garill A. Coles ◽  
Stephen D. Unwin ◽  
Tony B. Nguyen ◽  
Jeffery E. Dagle
Keyword(s):  
Risk Assessment ◽  
Power Grid ◽  
Low Frequency ◽  
High Impact ◽  
Assessment Framework ◽  
Low Frequency Power ◽  
Trial Implementation ◽  
Frequency Power
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