Agile Sub-Ice Geological (ASIG) Drill development and Pirrit Hills field project

Abstract A new drilling system was developed by the US Ice Drilling Program (IDP) to rapidly drill through overlying ice to collect subglacial rock cores. The Agile Sub-Ice Geological (ASIG) Drill system is capable of drilling up to 700 m of ice in a continuous manner. Intermittent ice core samples can be taken as needed. Ten-plus meters of subglacial bedrock and unconsolidated, frozen sediment cores can be drilled with wireline core retrieval. The functionality of the drill system was demonstrated in 2016–17 at the Pirrit Hills, Antarctica where 8 m of high-quality, continuous granite core was retrieved beneath 150 m of ice. The particulars of the drill system development, features and performance are discussed.

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Production drilling at WAIS Divide

Annals of Glaciology ◽

10.3189/2014aog68a018 ◽

2014 ◽

Vol 55 (68) ◽

pp. 147-155 ◽

Cited By ~ 14

Author(s):

Kristina R. Slawny ◽

Jay A. Johnson ◽

Nicolai B. Mortensen ◽

Christopher J. Gibson ◽

Joshua J. Goetz ◽

...

Keyword(s):

Ice Core ◽

Ice Sheet ◽

Austral Summer ◽

Snow Surface ◽

Scientific Interest ◽

High Quality ◽

Core Drilling ◽

Core Samples ◽

Drill Fluid ◽

Drilling Operations

AbstractThe deep ice-sheet coring (DISC) drill was used for production ice-core drilling at WAIS Divide in Antarctica for six field seasons between 2007 and 2013. Continuous ice-core samples were obtained between the snow surface and 3405 m depth. During the 2012/13 austral summer, the DISC drill’s newly designed replicate ice-coring system was utilized to collect nearly 285m of additional high-quality core samples at depths of high scientific interest. Annual progress graphs are described, as well as milestones achieved over the course of the project. Drilling operations, challenges encountered, drill fluid usage, drilling results, and the drill crew’s experiences with the DISC drill and replicate coring system during production drilling are described and discussed in detail. Core-processing operations are described briefly, as well as the logistical undertaking of the DISC drill’s deployment to Antarctica.

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Drilling operations for the South Pole Ice Core (SPICEcore) project

Annals of Glaciology ◽

10.1017/aog.2020.64 ◽

2020 ◽

pp. 1-14 ◽

Cited By ~ 1

Author(s):

Jay A. Johnson ◽

Tanner Kuhl ◽

Grant Boeckmann ◽

Chris Gibson ◽

Joshua Jetson ◽

...

Keyword(s):

Ice Core ◽

Austral Summer ◽

South Pole ◽

The South ◽

University Of Wisconsin ◽

Drilling Operations ◽

And Performance ◽

Core Project ◽

The University ◽

Drill System

Abstract Over the course of the 2014/15 and 2015/16 austral summer seasons, the South Pole Ice Core project recovered a 1751 m deep ice core at the South Pole. This core provided a high-resolution record of paleoclimate conditions in East Antarctica during the Holocene and late Pleistocene. The drilling and core processing were completed using the new US Intermediate Depth Drill system, which was designed and built by the US Ice Drilling Program at the University of Wisconsin–Madison. In this paper, we present and discuss the setup, operation, and performance of the drill system.

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RAM-2 Drill system development: an upgrade of the Rapid Air Movement Drill

Annals of Glaciology ◽

10.1017/aog.2020.72 ◽

2020 ◽

pp. 1-10

Author(s):

Christopher Gibson ◽

Grant Boeckmann ◽

Zachary Meulemans ◽

Tanner Kuhl ◽

Jim Koehler ◽

...

Keyword(s):

National Science Foundation ◽

System Development ◽

Air Movement ◽

Access Hole ◽

The Us ◽

National Science ◽

Drill System ◽

The U.S

Abstract Significant upgrades to the Rapid Air Movement (RAM) Drill were developed and tested by the US Ice Drilling Program in 2016 through 2020 for the U.S. National Science Foundation. The design of the system leverages the existing infrastructure of the RAM Drill with the goal of greatly reducing the logistical burden of deploying the drill while maintaining the ability to drill an access hole in firn and ice to 100 m in 40 min or less. In this paper, characteristics of the drill are described, along with a description of the drill performance during the testing at Raven Camp in Greenland and at WAIS Divide Camp in Antarctica.

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A new intermediate-depth ice-core drilling system

Annals of Glaciology ◽

10.3189/2014aog68a038 ◽

2014 ◽

Vol 55 (68) ◽

pp. 271-284 ◽

Cited By ~ 2

Author(s):

Simon G. Sheldon ◽

Trevor J. Popp ◽

Steffen B. Hansen ◽

Thomas M. Hedegaard ◽

Carsten Mortensen

Keyword(s):

Future Development ◽

Ice Core ◽

Ice Cores ◽

Snow Surface ◽

High Quality ◽

International Partnerships ◽

Intermediate Depth ◽

Ice Cap ◽

Drilling System ◽

Set Up

AbstractSeveral recent projects associated with the IPICS (International Partnerships in Ice Core Sciences) 2k array have demanded the recovery of ice core to depths in excess of several hundred metres (e.g. Flade Isblink, Greenland (2006), Aurora Basin, Antarctica (2008/09), NEEM, Greenland (2011), Aurora Basin North (2013/14) and Renland ice cap, Greenland (2015)). These projects require that the overall system weight is low, that the ability to set up and operate are within the limitations of a small-camp environment and that the overall logistical and transportation costs are kept to a minimum. Using these criteria, a new drilling system capable of drilling >400m depth was seen as a useful future development. Here we report on a new intermediate-depth drilling system designed to recover high-quality 98 mm diameter ice cores from close to surface down to depths of 1000 m by two or more operators in a small deep-field camp environment. The total weight of the system on the snow surface is ∼490 kg, of which the intermediate-depth winch is the single heaviest component at 305 kg with 1000 m of cable.

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Ice core drilling on a high-elevation accumulation zone of Trambau Glacier in the Nepal Himalaya

Annals of Glaciology ◽

10.1017/aog.2021.15 ◽

2021 ◽

pp. 1-7

Author(s):

Akane Tsushima ◽

Morihiro Miyahara ◽

Tetsuhide Yamasaki ◽

Nao Esashi ◽

Yota Sato ◽

...

Keyword(s):

Ice Core ◽

High Elevation ◽

Nepal Himalaya ◽

Core Drilling ◽

Drilling Operation ◽

Core Samples ◽

Cold Room ◽

Drill Site ◽

Commercial Flight ◽

Drill System

Abstract We drilled an 81.2-m-long ice core in the accumulation area (5860 m a.s.l.) of Trambau Glacier in the Rolwaling region during October–November 2019. The drilling operation was conducted with a lightweight electro-mechanical drill system after two reconnaissance fieldworks in 2017 and 2018, during which two shallow firn cores were drilled with a hand auger. The drill system and ice core samples were transported by helicopters at a high elevation of 6000 m a.s.l. A further challenging issue was the ice core transportation between Nepal and Japan, as no regular commercial flight was available for the frozen samples. The addition of dry ice imported from India immediately prior to leaving Nepal allowed the ice core samples to be successfully transported to a cold room in Japan, and remain in a frozen state. Stratigraphic observations during the drilling operation suggest the drill site has been affected by melting and refreezing.

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Relation of Statistically Significant, Abnormal, and Typical WAIS-R VIQ-PIQ Discrepancies to Full Scale IQs

European Journal of Psychological Assessment ◽

10.1027//1015-5759.16.2.107 ◽

2000 ◽

Vol 16 (2) ◽

pp. 107-114 ◽

Cited By ~ 3

Author(s):

Louis M. Hsu ◽

Judy Hayman ◽

Judith Koch ◽

Debbie Mandell

Keyword(s):

Graphical Method ◽

The United States ◽

Full Scale ◽

True Score ◽

Absolute Value ◽

Normative Population ◽

The Us ◽

The Mean ◽

And Performance ◽

Quadratic Models

Summary: In the United States' normative population for the WAIS-R, differences (Ds) between persons' verbal and performance IQs (VIQs and PIQs) tend to increase with an increase in full scale IQs (FSIQs). This suggests that norm-referenced interpretations of Ds should take FSIQs into account. Two new graphs are presented to facilitate this type of interpretation. One of these graphs estimates the mean of absolute values of D (called typical D) at each FSIQ level of the US normative population. The other graph estimates the absolute value of D that is exceeded only 5% of the time (called abnormal D) at each FSIQ level of this population. A graph for the identification of conventional “statistically significant Ds” (also called “reliable Ds”) is also presented. A reliable D is defined in the context of classical true score theory as an absolute D that is unlikely (p < .05) to be exceeded by a person whose true VIQ and PIQ are equal. As conventionally defined reliable Ds do not depend on the FSIQ. The graphs of typical and abnormal Ds are based on quadratic models of the relation of sizes of Ds to FSIQs. These models are generalizations of models described in Hsu (1996) . The new graphical method of identifying Abnormal Ds is compared to the conventional Payne-Jones method of identifying these Ds. Implications of the three juxtaposed graphs for the interpretation of VIQ-PIQ differences are discussed.

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A Bibliometric Analysis of Global Research on Lophomonas sp. in Scopus (1933-2019)

Infectious Disorders - Drug Targets ◽

10.2174/1871526520666200727153142 ◽

2020 ◽

Vol 20 ◽

Author(s):

Masoud Keighobadi ◽

Maryam Nakhaei ◽

Ali Sharifpour ◽

Ali Akbar Khasseh ◽

Sepideh Safanavaei ◽

...

Keyword(s):

Bibliometric Analysis ◽

International Collaboration ◽

Research Articles ◽

High Quality ◽

The Real ◽

The Us ◽

The World ◽

Scopus Database ◽

Number Of Publications ◽

Global Research

Background: This study was designed to analyze the global research on Lophomonas spp. using bibliometric techniques. Methods: A bibliometric research was carried out using the Scopus database. The analysis unit was the research articles conducted on Lophomonas spp. Results: Totally, 56 articles about Lophomonas spp. were indexed in the Scopus throughout 1933-2019 ( 87 years ) with the following information: (A) The first article was published in 1933; (B) 21 different countries contributed in studies related to Lophomonas spp.; (C) China ranked first with 16 publications about Lophomonas spp.; and (D) “Brugerolle, G” and “Beams, H.W.” from France and the US participated in 4 articles respectively, as the highest number of publications in the Lophomonas spp. network. Discussion: After 87 years, Lophomonas still remains unknown for many researchers and physicians around the world. Further studies with high quality and international collaboration are urgently needed to determine different epidemiological aspects and the real burden of the mysterious parasite worldwide.

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A post-tensioned self-centering yielding brace system: development and performance-based seismic analysis

Structure and Infrastructure Engineering ◽

10.1080/15732479.2020.1752262 ◽

2020 ◽

pp. 1-21

Author(s):

Elnaz Nobahar ◽

Behrouz Asgarian ◽

Oya Mercan ◽

Siavash Soroushian

Keyword(s):

Seismic Analysis ◽

System Development ◽

And Performance ◽

Post Tensioned

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Emotion Recognition on Edge Devices: Training and Deployment

Sensors ◽

10.3390/s21134496 ◽

2021 ◽

Vol 21 (13) ◽

pp. 4496

Author(s):

Vlad Pandelea ◽

Edoardo Ragusa ◽

Tommaso Apicella ◽

Paolo Gastaldo ◽

Erik Cambria

Keyword(s):

Emotion Recognition ◽

Language Processing ◽

Computational Cost ◽

Sequential Learning ◽

High Quality ◽

Fast Training ◽

Online Sequential Learning ◽

And Performance ◽

Resource Constrained Devices ◽

Constrained Devices

Emotion recognition, among other natural language processing tasks, has greatly benefited from the use of large transformer models. Deploying these models on resource-constrained devices, however, is a major challenge due to their computational cost. In this paper, we show that the combination of large transformers, as high-quality feature extractors, and simple hardware-friendly classifiers based on linear separators can achieve competitive performance while allowing real-time inference and fast training. Various solutions including batch and Online Sequential Learning are analyzed. Additionally, our experiments show that latency and performance can be further improved via dimensionality reduction and pre-training, respectively. The resulting system is implemented on two types of edge device, namely an edge accelerator and two smartphones.

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